Ethylene-vinyl acetate, also known as poly (ethylene-vinyl acetate) (PEVA), is the copolymer of ethylene and vinyl acetate. The weight percent of vinyl acetate usually varies from 10 to 40%, with the remainder being ethylene. There are three different types of EVA copolymer, which differ in the vinyl acetate (VA) content and the way the materials are used.
Eva Resin Ethylene as Rubber And Plastic,which is based on a low proportion of VA (approximately up to 4%) may be referred to as vinyl acetate modified polyethylene. It is a copolymer Boric Acid Flakes and is processed as a thermoplastics material – just like low density polyethylene. It has some of the properties of a low density polyethylene but increased gloss (useful for film), softness and flexibility. The material is generally considered non-toxic.
Eva Granule Resin is an elastomeric polymer that produces materials which are "rubber-like" in softness and flexibility. The material has good clarity and gloss, low-temperature toughness, stress-crack resistance, Titanium Dioxide hot-melt adhesive waterproof properties, and resistance to UV radiation. Ethylene Vinyl Acetate Resin has a distinctive vinegar-like odor and is competitive with rubber and vinyl polymer products in many electrical applications.
Ethylene-Vinyl Acetate,Eva Resin Ethylene,Eva Granule Resin,Ethylene Vinyl Acetate Resin HENAN LIHAO CHEM PLANT LIMITED , https://www.lihaoche.com
According to the structure of the center hole of the pulley and the actual cooperation with the shaft, the plant decided to use a transition joint method to restore the fastening of the pulley and the shaft. The specific approach is:
1 Expand the center hole of the pulley to the damaged keyway. After rounding, the diameter of the center hole of the pulley is 220H7. Then in the original keyway position processing consistent with the original keyway (b = 50, t1 = 12). When the hole is reamed, the two ends of the pulley are flattened, and the inner end face of the car is 10mm.
2 Use a=16mm steel plate to roll the sleeve and weld the flange to make a transition sleeve with an outer diameter of 220m7 and an inner diameter of 199H7. Open a longitudinal opening on the sleeve that is slightly larger than the width of the flat key and use the end face method. After the orchids were divided into 6 equal intervals, 3 of their towels were cut (Figure 2). 
4 Take the keyway on the eccentric shaft to the top. Place the thick flat keys in the keyways. Then put the transition shaft sleeve in the center hole of the pulley. The sleeve flange is located inside the pulley. Fit the center hole keyway. Then, the belt pulley and the transition shaft sleeve are press-fit together onto the eccentric shaft, and the joint bolt is fastened with a torque wrench (set torque of 700 N·m), and the shaft end shield is assembled, and the crusher resumes normal operation.
Jaw Crusher Eccentric Shaft Method Details Hammer Crusher Price
A limestone primary crusher in a raw material workshop of a factory adopts a PE600×900 complex pendulum jaw crusher. The pulley is a symmetrically split structure and is fastened with four M 24 bolts. See Figure 1 for the looseness of the bolts under the action of impact load and vibration. The center hole and the shaft have insufficient cooperating and fastening force, which seriously overloads the connecting keys and keyways. Deformation. Because the material of the pulley is HT250-400, and the material of the shaft is 12CrMo, the central hole of the pulley is worn more seriously, and the journal is almost without damage.