There are many grades of PVC. The viscosity or K value commonly used in the industry indicates the average molecular weight (or average degree of polymerization) of PVC, that is, the length of the PVC molecular chain, which determines the grade of the resin and the corresponding processing parameters. The molecular weight of the resin is related to the physical and mechanical properties of the product.
PVC used to be the largest general-purpose plastic in the world, and it is widely used. It is widely used in construction materials, industrial products, daily necessities, floor leather, floor tiles, artificial leather, pipes, wires and cables, packaging films, bottles, foam materials, sealing materials, fibers, etc
SG3 (K-70, S1300): mostly used for soft products, hoses, wires and cables, films, shoe materials, toys, auto parts etc.
PVC RESIN SG3 has high purity, less fish eyes, easy to blister, high temperature resistance, insulation, soft product texture, etc. It is mainly used to produce soft products such as wires and cables, agricultural films, conveyor belts, and daily plastic products.
PVC RESIN SG3,Pvc Resin Sg3 Sg5 Sg8,Pvc Resin K70,Pvc Resin Powder Sg3,Suspension Pvc Resin Sg3 Henan Shunbang Chemical Industry CO.,Ltd , https://www.sbcpe.com
If the wear particles are suspended in the oil, the gear will act as an abrasive, which will cause the abrasive wear to continue to develop. In order to prevent abrasive wear, it is very important to keep the lubricating oil clean. Oil bath lubrication uses a lower viscosity oil to facilitate abrasive precipitation. The oil must be filtered before it can be used; the lubricating system oil should be sampled and tested regularly, cleaned regularly, and the lubricant should be replaced in time to prevent abrasive wear.
The effect of lubrication on gluing Gluing is a common wear phenomenon in gear transmission, especially in high-speed and heavy-duty gear transmission. Because the pressure between the tooth surfaces is large, the instantaneous temperature is high. If the lubrication effect is poor, the two meshing will be achieved. The tooth faces are in direct contact, creating dry friction so that they stick together. Since the two tooth surfaces are relatively slid at this time, the bonded portions are torn again, and thus a flaw is formed on the tooth surface in the direction of relative sliding. Lubrication can affect the generation of gluing. For mineral oils without oil and extreme pressure agents, the higher the viscosity of the oil, the thicker the oil film forming the technical experience, the stronger the adhesion, the more resistant to gluing wear. Strong; if the oily agent is added to the mineral oil, it can effectively prevent the glue wear; for the extreme pressure gear oil containing the extreme pressure agent, it can chemically react with the gear surface to form an inorganic covering layer, thereby playing the gear Protective effects. In general, extreme pressure oil has better resistance to gluing wear than non-extreme pressure oil.
For general-purpose closed gear transmission, the lubrication method depends on the circumferential speed of the gear: when the circumferential speed of the gear is V<12m/s, the gear teeth of the large gear are often immersed in the oil pool for oil lubrication. In this way, when the gear is driven, the lubricating oil is brought to the meshing tooth surface, and the oil is also sucked onto the reducer casing wall to dissipate heat. The depth of the gear immersed in the oil depends on the circumferential speed of the gear. The cylindrical gear should not exceed one tooth height, but generally should not be less than 10mm. The bevel gear should be immersed in the full tooth width and should be immersed at least half of the tooth width. . In multi-stage gear transmission, the oil can be brought to the tooth surface of the gear that is not immersed in the oil pool.
The amount of oil in the oil pool depends on the amount of power transmitted by the gear. For a single-stage transmission, the required oil capacity is approximately 0.35 to 0.7L for each 1kW of power delivered; for multi-stage transmissions, the required oil quantity is multiplied by the number of stages. When the circumferential speed of the gear is v>12m/s, the fuel injection lubrication should be adopted, that is, the oil pump or the central oil supply station supplies oil at a certain pressure, and the lubricating oil is sprayed on the meshing surface of the gear by the nozzle. When v≤25m/s, the nozzle can be located at the engaging or engaging edge of the tooth. When v>25m/s, the nozzle should be located on the side of the tooth to be engaged. The teeth are also lubricated at the same time.
There are many ways to choose the type and viscosity of the lubricant. There are also many empirical formulas and charts, but to choose the right one, it should be determined through trial and error in practice.
A gear reducer is very hard to work from design, processing to assembly. If the function of the equipment cannot be fully utilized due to the lubrication problem, it is not worth the loss for the enterprise; in addition, the lubrication is not too high in technical content, as long as the operator is seriously responsible and observes, it is very easy to do the lubrication work. .
PVC Resin is a kind of non-crystalline linear polymer compound. The larger the relative molecular mass, the higher the viscosity, the higher the molecular weight, and the higher the tensile strength, impact strength, and elastic modulus of the product, but the flow of the resin melt Decline in sex and plasticity. The viscosity number is usually used to indicate the molecular weight of the polymer, and the polymer model is divided