MC nylon is a new class of polyamide engineering plastics , due to its excellent performance, making it the status of a rapid increase in engineering plastics has become an important material for mechanical parts , increasing usage .
MC nylon properties :
( 1 ) high strength to withstand the loading time ;
( 2 ) Compared with metal , MC nylon low hardness , no damage to the grinding parts ;
( 3 ) low coefficient of friction identification cable ties, which provides a wide range of possible applications in friction ;
( 4 ) good elasticity , can bend deformation, while maintaining toughness and resistance to repeated impact ;
( 5 ) self-lubricating wear-resistant , provides superior bronze , cast iron , carbon steel and phenolic plate performance when there is no oil or ( butter oil ) lubrication applications , reduce consumption , energy saving ;
( 6 ) suction noise , vibration , MC nylon die much smaller than the metal of vibration attenuation, provides a practical way better than metal effective to prevent noise ratio
(7) MC nylon products can be made in various colors according to user needs , without compromising quality and elegant appearance ;
( 8 ) high chemical stability , alkali , alcohol, ether , hydrocarbons , acid , oil , detergent , water ( sea water ) , and has odorless, non-toxic, tasteless , non- rust characteristics, its extensive used in alkali corrosion , environmental health , food ,stainless steel wire ties textile machinery spare parts , etc., provide excellent conditions for use ;
(9) MC nylon limit can not be used in the following environments and media :
a. temperature exceeds 120 ℃ long-term
high security bolt seals
high security bolt seals
2014年1月9日星期四
2014年1月8日星期三
Nylon cable ties Pipe
Pipe, Pipe large diameter , double-wall Pipe, Pipe Hollow , from the year 2000 the country began to introduce production equipment from abroad, domestic equipment manufacturers have developed a year of production equipment .
1 Introduction
Pipe, Pipe large diameter , double-wall Pipe, Pipe is a hollow high -density polyethylene (HDPE, PVC) as raw materials,
Welded by winding a pipe, because of its unique molding process , can produce up to three meters in diameter of the pipe, it is difficult to complete the production process of the other nylon cable tie. High-density polyethylene (HDPE, PVC) due to its own financial excellent welding performance not only ensure the molding process and product quality, but also for the construction of a reliable connection provides a variety of ways, such as electric fusion welding , heat shrink connections , etc. while this is an important reason for the leakage occurs rarely , but also precisely because of this reason, this pipe was not available with other pipes surrounded by unique features, this attention to the current pollution control provides a very effective way .
Second, the pipe performance
HDPE ( High Density Polyethylene ) double-walled large diameter pipes wrapped in HDPE as raw material, the two forming, it has the following advantages:
1 , chemical stability , acid , alkali, salt and strong , resistant to water , waste water and chemicals,cable ties corrosion, corrosion of soil rot , no rust .
2 , impact resistance , pressure , wall -shaped structure with a unique elastic deformation of large and difficult to destroy , have a very good base for any applicability .
3 , anti-aging , pipe storage and construction process can withstand the brunt of the sun , in the design and production process pipe full account of the 50 years when the material attenuation factor .
4 , wide temperature range , can be used in -50C to 60C within a temperature range without cracking and swelling leakage.
5 , light weight, the weight of the cement pipe , 1/ 10 ( equivalent water efficiency under ) without heavy construction equipment .
6 , easy connection .
7 , superior wear resistance than cement pipes, pipe wear life more than 50 years .
8 , the price of raw materials , low construction , management and maintenance costs.
9, HDPE material is non-toxic , harmless to the land , the use of renewable , environmentally friendly green products.
1 Introduction
Pipe, Pipe large diameter , double-wall Pipe, Pipe is a hollow high -density polyethylene (HDPE, PVC) as raw materials,
Welded by winding a pipe, because of its unique molding process , can produce up to three meters in diameter of the pipe, it is difficult to complete the production process of the other nylon cable tie. High-density polyethylene (HDPE, PVC) due to its own financial excellent welding performance not only ensure the molding process and product quality, but also for the construction of a reliable connection provides a variety of ways, such as electric fusion welding , heat shrink connections , etc. while this is an important reason for the leakage occurs rarely , but also precisely because of this reason, this pipe was not available with other pipes surrounded by unique features, this attention to the current pollution control provides a very effective way .
Second, the pipe performance
HDPE ( High Density Polyethylene ) double-walled large diameter pipes wrapped in HDPE as raw material, the two forming, it has the following advantages:
1 , chemical stability , acid , alkali, salt and strong , resistant to water , waste water and chemicals,cable ties corrosion, corrosion of soil rot , no rust .
2 , impact resistance , pressure , wall -shaped structure with a unique elastic deformation of large and difficult to destroy , have a very good base for any applicability .
3 , anti-aging , pipe storage and construction process can withstand the brunt of the sun , in the design and production process pipe full account of the 50 years when the material attenuation factor .
4 , wide temperature range , can be used in -50C to 60C within a temperature range without cracking and swelling leakage.
5 , light weight, the weight of the cement pipe , 1/ 10 ( equivalent water efficiency under ) without heavy construction equipment .
6 , easy connection .
7 , superior wear resistance than cement pipes, pipe wear life more than 50 years .
8 , the price of raw materials , low construction , management and maintenance costs.
9, HDPE material is non-toxic , harmless to the land , the use of renewable , environmentally friendly green products.
2013年10月27日星期日
Three eccentric metal seal butterfly valve structural features interpreted
1 , three eccentric multi-level metal seal butterfly valve butterfly plate stacked rings of hard and soft metal sheets , metal seals and elastomeric seals with the dual advantages of both low and high temperatures, both with excellent sealing performance.
2 , the use of three-dimensional eccentric structure , seat and disc almost no friction parts inside the valve when closed almost no damage ; This structure greatly improves the performance of the valve in use . And has a more closed more tightly sealing function .
3 , the stem , the lower part is equipped with bushings , each bushing wear and friction generated is small , this structure can prevent wear and adhesion, but also improve the service life.
4, the valve sealing surface , the use of alloy steel or stellite alloy,barrier security seals sealing surface abrasion, erosion , corrosion resistance ; long service life.
5 , unique structure , switching torque is small , flexible operation, labor-saving , convenient, high pressure from the media , low-impact , reliable sealing performance . Can be used for opening and closing and regulating equipment .
2 , the use of three-dimensional eccentric structure , seat and disc almost no friction parts inside the valve when closed almost no damage ; This structure greatly improves the performance of the valve in use . And has a more closed more tightly sealing function .
3 , the stem , the lower part is equipped with bushings , each bushing wear and friction generated is small , this structure can prevent wear and adhesion, but also improve the service life.
4, the valve sealing surface , the use of alloy steel or stellite alloy,barrier security seals sealing surface abrasion, erosion , corrosion resistance ; long service life.
5 , unique structure , switching torque is small , flexible operation, labor-saving , convenient, high pressure from the media , low-impact , reliable sealing performance . Can be used for opening and closing and regulating equipment .
2013年10月22日星期二
How to eliminate the external conditions on the effects of mechanical seals for pumps
The pump mechanical seal is used, not only to consider the mechanical seal itself, influencing factors, tamper evident seals but also to consider a variety of mechanical seals external factors .
1 large measure to eliminate channeling shaft
Rational design of axial force balancing device , eliminate the axial channeling . To meet this requirement , for multi- stage centrifugal pumps, ideal design is twofold: one is to balance the axial thrust bearing plate plus , the balance disc balance the axial force , the axial thrust bearing on the shaft for axial limit ; balancing drum plus the other is an axial thrust bearing , the balance drum axial force balance out the most , and the remaining axial force by thrust bearings bear , while the axial thrust bearing for the shaft axis to the limit . The second scheme is the key to the rational design of balancing drum so that it can really balance out most of the axial force. For other single-stage pump in a pump and other products, are designed to take some measures to ensure that the amount of the mechanical shaft seal channeling the required range.
(2) Measures to eliminate the axial force is too large
Rational design of axial force balance mechanism , so that it can truly and fully balance out the axial force to the mechanical wire seal to create a good condition. For some plants , petroleum, chemical and other fields important products , in the factory before the test must be done to detect and Taiwan and Taiwan issues and solve problems. Some pumps can be important to design a rotor axial measuring ring , on the size of the axial force at any time to monitor , identify problems and timely solutions.
1 large measure to eliminate channeling shaft
Rational design of axial force balancing device , eliminate the axial channeling . To meet this requirement , for multi- stage centrifugal pumps, ideal design is twofold: one is to balance the axial thrust bearing plate plus , the balance disc balance the axial force , the axial thrust bearing on the shaft for axial limit ; balancing drum plus the other is an axial thrust bearing , the balance drum axial force balance out the most , and the remaining axial force by thrust bearings bear , while the axial thrust bearing for the shaft axis to the limit . The second scheme is the key to the rational design of balancing drum so that it can really balance out most of the axial force. For other single-stage pump in a pump and other products, are designed to take some measures to ensure that the amount of the mechanical shaft seal channeling the required range.
(2) Measures to eliminate the axial force is too large
Rational design of axial force balance mechanism , so that it can truly and fully balance out the axial force to the mechanical wire seal to create a good condition. For some plants , petroleum, chemical and other fields important products , in the factory before the test must be done to detect and Taiwan and Taiwan issues and solve problems. Some pumps can be important to design a rotor axial measuring ring , on the size of the axial force at any time to monitor , identify problems and timely solutions.
2013年9月25日星期三
Labyrinth seal device successfully applied Dryer
In order to better seal the dryer , mechanical R & D personnel to undergo many , many studies , and ultimately a " labyrinth " security seals seal and successfully applied slime dryer, rotary dryer and three drum drying dry fields.
Research found : Dryer labyrinth seal is curved so that the air flow through the channels, generation of fluid resistance, so that air leakage is reduced .
Dryer according to the different labyrinth passage direction , the labyrinth seal into the axial and radial labyrinth seal. Slime dryer labyrinth seal structure is simple , there is no contact surface , so there is no wear problems , it is not traverse of the cylinder .
Considering the inherent cylinder and labyrinth seal manufacturing error , and the cylinder axis of the bending stiffness , the gap between adjacent labyrinth ring is not too small , generally not less than 20-40mm.
The greater the gap , the fewer the number labyrinth sealing effect is worse . Therefore, the labyrinth seal is only applicable where the gas pressure is small , or in combination with other sealing structure . This technological innovation allows Huachang Machinery tasted the sweetness , tamper seal labels but this little seal limitations Huachang Machinery recently came to do a number of initiatives in the hope that other sealing technology breakthrough.
Research found : Dryer labyrinth seal is curved so that the air flow through the channels, generation of fluid resistance, so that air leakage is reduced .
Dryer according to the different labyrinth passage direction , the labyrinth seal into the axial and radial labyrinth seal. Slime dryer labyrinth seal structure is simple , there is no contact surface , so there is no wear problems , it is not traverse of the cylinder .
Considering the inherent cylinder and labyrinth seal manufacturing error , and the cylinder axis of the bending stiffness , the gap between adjacent labyrinth ring is not too small , generally not less than 20-40mm.
The greater the gap , the fewer the number labyrinth sealing effect is worse . Therefore, the labyrinth seal is only applicable where the gas pressure is small , or in combination with other sealing structure . This technological innovation allows Huachang Machinery tasted the sweetness , tamper seal labels but this little seal limitations Huachang Machinery recently came to do a number of initiatives in the hope that other sealing technology breakthrough.
2013年8月27日星期二
Material rubber sealing profiles
China air with special rubber sealing profiles used by the rubber material of nitrile rubber prior to the widespread use of silicone rubber, fluorosilicone rubber , rubber material functional direction.
Currently China Airlines with special rubber sealing profiles used in various types of sealing profiles to neoprene and nitrile rubber and the most widely used . And rubber , while having good strength and excellent oil resistance , but its impatience sunlight , machined rubber profiles in flight conditions often occur after a period of time cracking phenomenon , profiles the life and the use of safety are compromised .
Europe and other countries, new types of aircraft designed multi- use silicone rubber as its aviation special rubber coloured cable ties profiles of the main material . Silicone rubber temperature field performance, while also superior resistance to weather aging properties of nitrile rubber and other materials , but its strength is low , but do not have the fire-retardant requirements. Silicone rubber sealing profiles to improve strength and wear resistance , the use of the compound used more and fabric materials .
Most aircraft parts are resistant to burning requirements, silicone rubber material with the added need to make the processing of various types of flame retardant sealing profiles to achieve resistance to combustion requirements. Flame retardants are widely used in the past , aluminum hydroxide, decabromodiphenyl ether , aluminum hydroxide as an aftereffect flame retardant, requires a large amount of filler in order to achieve better flame-retardant effect , would seriously undermine the filling material mechanical properties. DecaBDE as halogen-containing flame retardant effect of the fine , but its release toxic gases when burned difficult to meet the environmental requirements of the aviation industry now .
In order to meet the requirements , the domestic enterprises to use composite materials to improve flame retardant silicone rubber profiles , through the use of new and efficient platinum -based flame retardant to achieve efficient and environmentally friendly flame retardant dual requirements . According to the literature reports, foreign countries have developed a new reactive flame retardant, can pass with minimal amount of combustion flame retardant chemical reactions to achieve results.
For aviation development, new aviation with special rubber tamper seal profiles even require electromagnetic shielding , high-temperature resistant , thermal conductivity , anti- erosion and other special requirements .
Currently China Airlines with special rubber sealing profiles used in various types of sealing profiles to neoprene and nitrile rubber and the most widely used . And rubber , while having good strength and excellent oil resistance , but its impatience sunlight , machined rubber profiles in flight conditions often occur after a period of time cracking phenomenon , profiles the life and the use of safety are compromised .
Europe and other countries, new types of aircraft designed multi- use silicone rubber as its aviation special rubber coloured cable ties profiles of the main material . Silicone rubber temperature field performance, while also superior resistance to weather aging properties of nitrile rubber and other materials , but its strength is low , but do not have the fire-retardant requirements. Silicone rubber sealing profiles to improve strength and wear resistance , the use of the compound used more and fabric materials .
Most aircraft parts are resistant to burning requirements, silicone rubber material with the added need to make the processing of various types of flame retardant sealing profiles to achieve resistance to combustion requirements. Flame retardants are widely used in the past , aluminum hydroxide, decabromodiphenyl ether , aluminum hydroxide as an aftereffect flame retardant, requires a large amount of filler in order to achieve better flame-retardant effect , would seriously undermine the filling material mechanical properties. DecaBDE as halogen-containing flame retardant effect of the fine , but its release toxic gases when burned difficult to meet the environmental requirements of the aviation industry now .
In order to meet the requirements , the domestic enterprises to use composite materials to improve flame retardant silicone rubber profiles , through the use of new and efficient platinum -based flame retardant to achieve efficient and environmentally friendly flame retardant dual requirements . According to the literature reports, foreign countries have developed a new reactive flame retardant, can pass with minimal amount of combustion flame retardant chemical reactions to achieve results.
For aviation development, new aviation with special rubber tamper seal profiles even require electromagnetic shielding , high-temperature resistant , thermal conductivity , anti- erosion and other special requirements .
2013年8月22日星期四
Concrete sealer absolute advantage
First permanent increase strength and hardness: sealed concrete curing agent, curing the composition to make the concrete into a hard solid, forming a three-dimensional network structure, thereby increasing the density of the concrete, strength and hardness, and greatly improves the wear of concrete capability. Pink light after a smooth surface, will produce marble as beautiful sheen; through concrete sealer treated concrete, than the untreated, completely cured concrete compressive strength at 30 days after experimental determination, strength increases more than 30% and may vary time growth continued to increase intensity.
According to the introduction, and it permanently sealed, impermeability: concrete sealer used only once, and concrete that is subject to conservation role in the life cycle is permanently pull tight straps sealed and resistant to any oil and other contaminants; permanently cured concrete : concrete sealer to make the new concrete floor, inhibit minor cracks and temperature cracks, when construction for newly completed after proper watering and the solid concrete, concrete sealer and concrete composition of a chemical reaction substances, concrete sealer will retain the hydration process is extremely important for water conservation and consistency of concrete.
In addition it does not produce dust Permanent: sealed concrete curing agent and silicate concrete chemical reaction can be permanently sealed concrete curing agent to eliminate voids released from the surface of the concrete particles, thereby preventing from the gray; superior combination of Abilities: By eliminating the adverse combination of the concrete surface salts prepared surface more conducive to painting, waterproofing materials, combined with the use of agents and flooring materials; save a lot of repair and maintenance costs: According to experts, the concrete truck seal sealer treatment off the ground without waxing, only occasionally with soap and water or mopping the floor.
According to the introduction, and it permanently sealed, impermeability: concrete sealer used only once, and concrete that is subject to conservation role in the life cycle is permanently pull tight straps sealed and resistant to any oil and other contaminants; permanently cured concrete : concrete sealer to make the new concrete floor, inhibit minor cracks and temperature cracks, when construction for newly completed after proper watering and the solid concrete, concrete sealer and concrete composition of a chemical reaction substances, concrete sealer will retain the hydration process is extremely important for water conservation and consistency of concrete.
In addition it does not produce dust Permanent: sealed concrete curing agent and silicate concrete chemical reaction can be permanently sealed concrete curing agent to eliminate voids released from the surface of the concrete particles, thereby preventing from the gray; superior combination of Abilities: By eliminating the adverse combination of the concrete surface salts prepared surface more conducive to painting, waterproofing materials, combined with the use of agents and flooring materials; save a lot of repair and maintenance costs: According to experts, the concrete truck seal sealer treatment off the ground without waxing, only occasionally with soap and water or mopping the floor.
2013年8月14日星期三
The role and significance of the seal
The role and significance of the seal Abstract: hydraulic systems and system seals to prevent leakage of the working medium outside intrusion from dirt and dust sealing element sealing leakage caused by the working medium machine environment pollution caused by waste machinery accidents caused by malfunctioning equipment volumetric efficiency of the hydraulic system of a sharp decline working pressure not less than required to work into the system caused by tiny dust particles 2002: machine tools, the WTO is a challenge but also opportunities for experts pointed out that China's CNC machine tools to increase research and development efforts to accelerate the development of universal CNC machine tool manufacturing services Rambling Chinese competition in China milling machines and machining centers market situation and outlook abroad lathe level of technology and development direction of the world production of machining centers, needs and developments at home and abroad the world development trend of CNC machine tools trends CNC machining technology and the development of the hydraulic system and their system, the marker cable ties sealing means for preventing leakage of working fluid and the intrusion of dust and foreign matter outside. Wherein the seal element, namely seals. Leakage will result in the waste of the working medium, pollution, machines and the environment, and even cause malfunctioning machinery and equipment, personal accident. Endoleaks volumetric efficiency of the hydraulic system will cause a sharp decline, reach the desired working pressure, can not even work. Intrusion systems tiny dust particles can cause or exacerbate the wear of hydraulic components, and further lead to leakage.
Therefore, Security seals and sealing device is a hydraulic device is an important component. It's the reliability and service life of the hydraulic system is a measure of an important indicator of good or bad. In addition to the gap seals, are the use of seals, so that two adjacent coupling gap between the surface of the liquid to be sealed controlled through the following minimum clearance. In-contact seal is divided into self-sealing compression seals and self-styled self-tight seal (ie lip seal) two kinds.
Therefore, Security seals and sealing device is a hydraulic device is an important component. It's the reliability and service life of the hydraulic system is a measure of an important indicator of good or bad. In addition to the gap seals, are the use of seals, so that two adjacent coupling gap between the surface of the liquid to be sealed controlled through the following minimum clearance. In-contact seal is divided into self-sealing compression seals and self-styled self-tight seal (ie lip seal) two kinds.
2013年8月8日星期四
Commonly used self-sealing compression hydraulic seals
Commonly used self-sealing compression hydraulic PTFE seals mainly O-ring, round and square ring seals, etc., which has a simple structure, easy to manufacture, low cost, etc., so they are hydraulic drive widely used in dynamic sealing element and static sealing.
Hydraulic black cable ties mounted in the sealing groove generally produce 10-25% of the radial compression deformation, and the sealing surface to produce a higher initial contact stress, thereby preventing leakage of the liquid without pressure.
Hydraulic cylinders work, the pressure fluid squeeze self-sealing compression hydraulic seals, so that further deformation, and the sealing surface with a greater pressure on the liquid pressure, the pressure should be strictly. The additional increased and increased contact stress and stress together with the initial contact pressure to prevent leakage of the liquid. However, when the working pressure is greater than 10Mpa, in order to avoid self-sealing synthetic rubber-type hydraulic Security seals compression portion of the sealing gap is extruded into reciprocating motion in the cylinder is cut off and cause leakage, to puncture the synthetic rubber-type pressure tight seal hydraulic pressure side of each setting a synthetic resin retainer, such as nylon ring, ring and PTFE POM ring.
Hydraulic black cable ties mounted in the sealing groove generally produce 10-25% of the radial compression deformation, and the sealing surface to produce a higher initial contact stress, thereby preventing leakage of the liquid without pressure.
Hydraulic cylinders work, the pressure fluid squeeze self-sealing compression hydraulic seals, so that further deformation, and the sealing surface with a greater pressure on the liquid pressure, the pressure should be strictly. The additional increased and increased contact stress and stress together with the initial contact pressure to prevent leakage of the liquid. However, when the working pressure is greater than 10Mpa, in order to avoid self-sealing synthetic rubber-type hydraulic Security seals compression portion of the sealing gap is extruded into reciprocating motion in the cylinder is cut off and cause leakage, to puncture the synthetic rubber-type pressure tight seal hydraulic pressure side of each setting a synthetic resin retainer, such as nylon ring, ring and PTFE POM ring.
2013年8月6日星期二
Commonly used self-sealing compression hydraulic seals
Commonly used self-sealing compression hydraulic PTFE seals mainly O-ring, round and square ring seals, etc., which has a simple structure, easy to manufacture, low cost, etc., so they are hydraulic drive widely used in dynamic sealing element and static sealing.
Hydraulic seals mounted in the sealing groove generally produce 10-25% of the radial compression deformation, and the sealing surface to produce a higher initial contact stress, thereby preventing leakage of the liquid without pressure.
Hydraulic cylinders work, the pressure fluid squeeze self-sealing compression hydraulic seals, so that further deformation, and the sealing surface with a greater pressure on the liquid pressure, the pressure should be strictly. The additional increased and increased contact stress and stress together with the initial contact pressure to prevent leakage of the liquid. However, when the working pressure is greater than 10Mpa, in order to avoid self-sealing cargo seals synthetic rubber-type hydraulic seal compression portion of the sealing gap is extruded into reciprocating motion in the cylinder is cut off and cause leakage, to puncture the synthetic rubber-type pressure tight security seals seal hydraulic pressure side of each setting a synthetic resin retainer, such as nylon ring, ring and PTFE POM ring.
Hydraulic seals mounted in the sealing groove generally produce 10-25% of the radial compression deformation, and the sealing surface to produce a higher initial contact stress, thereby preventing leakage of the liquid without pressure.
Hydraulic cylinders work, the pressure fluid squeeze self-sealing compression hydraulic seals, so that further deformation, and the sealing surface with a greater pressure on the liquid pressure, the pressure should be strictly. The additional increased and increased contact stress and stress together with the initial contact pressure to prevent leakage of the liquid. However, when the working pressure is greater than 10Mpa, in order to avoid self-sealing cargo seals synthetic rubber-type hydraulic seal compression portion of the sealing gap is extruded into reciprocating motion in the cylinder is cut off and cause leakage, to puncture the synthetic rubber-type pressure tight security seals seal hydraulic pressure side of each setting a synthetic resin retainer, such as nylon ring, ring and PTFE POM ring.
2013年8月5日星期一
Common Seal Material Description
Depending on the application may be different in different types of security seals used in combination to accommodate different sealing conditions. Its commonly used materials can be divided into two categories, namely rubber and resins. A rubber sealing material used nitrile rubber, polyurethane rubber, fluorine rubber, silicone rubber, commonly used resin sealing material PTFE, phenolic resin, polyamide resin.
First, the rubber is a high elasticity of the organic molecular compounds, the main component of natural or synthetic caoutchouc. Raw rubber after vulcanization process and after adding various ingredients, so that the rubber can be made with our performance requirements. The rubber sealing systems are mostly used nitrile rubber, polyurethane rubber, silicone rubber, fluorine rubber.
1, the nitrile rubber is a copolymer of acrylonitrile butanediyl the body, it has good oil resistance, abrasion resistance and aging resistance around the song, so it is the most commonly used synthetic rubber.
2, polyurethane is a polyester or polyether with diisocyanate polymerization of the compound, it is high wear resistance, oil resistance, aging resistance, ozone resistance, in addition, is also very good air tightness.
3, the use of silicone rubber wide temperature range, anti-aging and resistance to radiation resistance.
4, fluorine rubber is a copolymer made by the fluorine-containing monomer organic elastomers, high temperature up to 300 º C, acid and alkali, abrasion, sunlight resistance, flame resistance, excellent air tightness is the overall performance of special synthetic rubber. Viton deficiency is poor cold tolerance, resistance to poor processability, low elasticity and expensive. Usually used to make the rubber O-rings, oil seals, rotary lip plastic seal, reciprocating seals, etc., the seal industry, one of the most commonly used materials.
First, the rubber is a high elasticity of the organic molecular compounds, the main component of natural or synthetic caoutchouc. Raw rubber after vulcanization process and after adding various ingredients, so that the rubber can be made with our performance requirements. The rubber sealing systems are mostly used nitrile rubber, polyurethane rubber, silicone rubber, fluorine rubber.
1, the nitrile rubber is a copolymer of acrylonitrile butanediyl the body, it has good oil resistance, abrasion resistance and aging resistance around the song, so it is the most commonly used synthetic rubber.
2, polyurethane is a polyester or polyether with diisocyanate polymerization of the compound, it is high wear resistance, oil resistance, aging resistance, ozone resistance, in addition, is also very good air tightness.
3, the use of silicone rubber wide temperature range, anti-aging and resistance to radiation resistance.
4, fluorine rubber is a copolymer made by the fluorine-containing monomer organic elastomers, high temperature up to 300 º C, acid and alkali, abrasion, sunlight resistance, flame resistance, excellent air tightness is the overall performance of special synthetic rubber. Viton deficiency is poor cold tolerance, resistance to poor processability, low elasticity and expensive. Usually used to make the rubber O-rings, oil seals, rotary lip plastic seal, reciprocating seals, etc., the seal industry, one of the most commonly used materials.
2013年7月30日星期二
Sealing material compatibility of the hydraulic oil
The hydraulic fluid source of particulate contamination of the seal material is incompatible with the hydraulic oil and the resulting "chips" or "debris." Seals for "swelling" is damaged resulting "debris" or "extraction" is not out of a combination of inorganic and filling reinforcing material to security seals damage and failure, while the formation of pollution of hydraulic oil oil deterioration resulting failure.
Hydraulic vane pump system widely used in the state of working pressure greater than 6.9MPa, the wear problem becomes prominent, and therefore the hydraulic fluid used antiwear agent; in order to meet the high temperature heat and flame near the hydraulic system, use of anti- burning phosphate, water - glycol hydraulic fluid, oil, and oil-water emulsions and so on. And should "use" born of the antioxidant, rust and other types of composite additives configured for different uses hydraulic oil (liquid) variety.
Seals have a "swelling" or "extraction" because the hydraulic oil additives of various chemical elements contained in its concentration, based on "like dissolves like" principle, for different cable sealing materials have different impact, but also both sealing material medium resistance.
Hydraulic vane pump system widely used in the state of working pressure greater than 6.9MPa, the wear problem becomes prominent, and therefore the hydraulic fluid used antiwear agent; in order to meet the high temperature heat and flame near the hydraulic system, use of anti- burning phosphate, water - glycol hydraulic fluid, oil, and oil-water emulsions and so on. And should "use" born of the antioxidant, rust and other types of composite additives configured for different uses hydraulic oil (liquid) variety.
Seals have a "swelling" or "extraction" because the hydraulic oil additives of various chemical elements contained in its concentration, based on "like dissolves like" principle, for different cable sealing materials have different impact, but also both sealing material medium resistance.
2013年7月29日星期一
Formation of sealing effect
Dynamic seal is divided into non-contact seals and contact seals. Non-contact seal mainly a variety of mechanical seals, such as: graphite packing ring, floating ring seals; rubber composite seals and rubber seals belong portfolio contact seals, relying on filling in a sealed chamber in the pre-compression force, leakage channel blocking sealing effect is obtained. Seals used in hydraulic systems are mostly static seal (seal), reciprocating seals (piston, piston rod seal) and rotating seal.
Sealing material and hydraulic oil (fluid) will affect the compatibility of the sealing effect of the formation:
The hydraulic fluid source of particulate contamination of the seal material is incompatible with the hydraulic oil and the resulting "chips" or "debris." Seals for "swelling" is damaged resulting "debris" or "extraction" is not out of a combination of inorganic and filling reinforcing material to id cable ties damage and failure, while the formation of pollution of hydraulic oil oil deterioration resulting failure.
Hydraulic vane pump system widely used in the state of working pressure greater than 6.9MPa, the wear problem becomes prominent, and therefore the hydraulic fluid used antiwear agent; in order to meet the high temperature heat and flame near the hydraulic system, use of anti- burning phosphate, water - glycol hydraulic fluid, oil, and oil-water emulsions and so on. And should "use" born of the antioxidant, rust and other types of composite additives configured for different uses hydraulic oil (liquid) variety. Such as: Anti-wear hydraulic oil compound type zinc-type (ash-free) anti-wear hydraulic oil compound, is a hydrocarbon sulfides, phosphates, phosphites, etc., as well as while sulfur, phosphorus and nitrogen SPN three elements extreme pressure anti-wear agents. In extreme pressure industrial gear oils, also PS-type extreme pressure agents based.
Seals have a "swelling" or "extraction" because the hydraulic oil additives of various chemical elements contained in its concentration, based on "like dissolves like" principle, for different sealing materials have different impact, but also both sealing material medium resistance. For example: Shell Omala 320 gear oils and gear oils Shell Omala 460 shows polar phosphorus (P) element concentrations in 300ppm or so, so for containing acrylonitrile butadiene rubber which has a polar group, with excellent oil resistance, but not suitable for this type of oil medium conditions.
With the hydraulic oil (oil) species continue research in order to improve oil (liquid) the performance of a variety of anti-wear, extreme pressure additives, metal deactivators, demulsifiers and anti-foam additives, the material of the rail car seals need to experiment to validate.
Sealing material and hydraulic oil (fluid) will affect the compatibility of the sealing effect of the formation:
The hydraulic fluid source of particulate contamination of the seal material is incompatible with the hydraulic oil and the resulting "chips" or "debris." Seals for "swelling" is damaged resulting "debris" or "extraction" is not out of a combination of inorganic and filling reinforcing material to id cable ties damage and failure, while the formation of pollution of hydraulic oil oil deterioration resulting failure.
Hydraulic vane pump system widely used in the state of working pressure greater than 6.9MPa, the wear problem becomes prominent, and therefore the hydraulic fluid used antiwear agent; in order to meet the high temperature heat and flame near the hydraulic system, use of anti- burning phosphate, water - glycol hydraulic fluid, oil, and oil-water emulsions and so on. And should "use" born of the antioxidant, rust and other types of composite additives configured for different uses hydraulic oil (liquid) variety. Such as: Anti-wear hydraulic oil compound type zinc-type (ash-free) anti-wear hydraulic oil compound, is a hydrocarbon sulfides, phosphates, phosphites, etc., as well as while sulfur, phosphorus and nitrogen SPN three elements extreme pressure anti-wear agents. In extreme pressure industrial gear oils, also PS-type extreme pressure agents based.
Seals have a "swelling" or "extraction" because the hydraulic oil additives of various chemical elements contained in its concentration, based on "like dissolves like" principle, for different sealing materials have different impact, but also both sealing material medium resistance. For example: Shell Omala 320 gear oils and gear oils Shell Omala 460 shows polar phosphorus (P) element concentrations in 300ppm or so, so for containing acrylonitrile butadiene rubber which has a polar group, with excellent oil resistance, but not suitable for this type of oil medium conditions.
With the hydraulic oil (oil) species continue research in order to improve oil (liquid) the performance of a variety of anti-wear, extreme pressure additives, metal deactivators, demulsifiers and anti-foam additives, the material of the rail car seals need to experiment to validate.
2013年7月28日星期日
Overhaul of the mechanical seal
Mechanical seals are composed of two sealing elements (static ring and ring) perpendicular to the axis, smooth and flat surface bonded to each other and relative to the rotation of a sealing means. It is sealed by a pressure medium in the rotating ring contact surface of the stationary ring together (end) to generate an appropriate pressing force, so that the two end faces closely, face the maintenance of a very thin layer of the liquid film to seal strap purposes. This layer of liquid film has a dynamic pressure and static pressure of the liquid and plays the role of lubricating co counterweight.
1 a cleaning and inspection of the mechanical seal
1) The working principle of the mechanical seal mechanical seal requirements without any impurities inside. In the assembly of mechanical seal thoroughly before cleaning ring, stationary rings, bushings and other components.
2) Check the static ring surfaces for scratches, cracks and other defects, which poses a serious mechanical seal leakage. Conditions can be checked with a special tool sealing surface is smooth, sealed surface is not flat, the pressure of water will enter the assembly of the movement after the mechanical seal ring sealing surface, will separate the static ring, mechanical seal failure. When necessary, can be made before assembly tooling hydrostatic test.
3) check whether there is movement affect the sealing ring seat defects. Such as movement and movement ring seat ring seal mating surface for defects.
4) Check the mechanical seal spring compensation for damage and deformation, stubborn coefficient is changed.
5) Check that the sealing sleeve existence of burrs, grooves and other defects.
6) Check all gasket sweeping the presence of cracks, holes and other defects, whether the diameter measurement apron within tolerance.
7) has a pumping mechanism of screw pump mechanical security seals also check whether there is a spiral line cracks, breakage and other defects.
1 a cleaning and inspection of the mechanical seal
1) The working principle of the mechanical seal mechanical seal requirements without any impurities inside. In the assembly of mechanical seal thoroughly before cleaning ring, stationary rings, bushings and other components.
2) Check the static ring surfaces for scratches, cracks and other defects, which poses a serious mechanical seal leakage. Conditions can be checked with a special tool sealing surface is smooth, sealed surface is not flat, the pressure of water will enter the assembly of the movement after the mechanical seal ring sealing surface, will separate the static ring, mechanical seal failure. When necessary, can be made before assembly tooling hydrostatic test.
3) check whether there is movement affect the sealing ring seat defects. Such as movement and movement ring seat ring seal mating surface for defects.
4) Check the mechanical seal spring compensation for damage and deformation, stubborn coefficient is changed.
5) Check that the sealing sleeve existence of burrs, grooves and other defects.
6) Check all gasket sweeping the presence of cracks, holes and other defects, whether the diameter measurement apron within tolerance.
7) has a pumping mechanism of screw pump mechanical security seals also check whether there is a spiral line cracks, breakage and other defects.
2013年7月8日星期一
Container seal numbers do not how
Container seals the container is to use another envelope with seal, where attention, container seals is with a lock, the lock above the number that corresponds to each container seal numbers are not the same, container seal is disposable, opened or broken no longer useless, it shows that the container was opened, with the intention friends find themselves at the time of delivery of the container seal numbers wrong, it does not directly mention either care, put the container in the list when the container seal numbers must be right up there so you can get the goods basically guarantee assured delivery, this issue is sure to be noted that the container seal numbers.Bolt seal
So if the container seal numbers not how to do? This can be found directly by Customs officers say their own container seal numbers and factory shipments wrong, they will help you find the container seal numbers wrong reasons, do not hurry yourself, but in this case the container seal numbers right under their own one thousand Wan not signed receipt, directly until the container seal numbers not found a cause or approach in the delivery of the goods.Meter seal
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