Rubber Belts

Rubber Belts
Rubber is employed for a number of perposes in belts. The leading uses are:
1) conveyor belts;
2) Flat transmission belts;
3) V-belts.
The fabric used for belts must be such that (1) The warp thread are strong enough to carry the required loads; (2) The weft threads must be sufficiently strong so that belt fasteners will be held firmly. For both conveyor belts and transmission belts the initial stage of preparation are very mush the same. The fabric must first be dried either by passing over a series of hot rollers or through a drying chamber. The fractioning process is carried out while the fabrics still warm. The milled compound is fed between the top and middle bowls and runs on the middle bowl. The fabric is fed between the bottom and middle bowls. The compound is forced into the interstices of the fabric, the fractioned fabric being cooled. The operation is repeated for the other side. Using a liner to prevent sticking.
Conveyor belts
Rubber conveyor belts are used for conveying every conceivable type of material. They are consisted of : (1)duck fractioned with rubber; (2)a tough rubber cover which protects the duck against corrosion and mechanical attack.
The plies are assembled on ling tables, being passed through squeeze rolls to consolidate them.
The rubber cover may be applied in several ways. Calendered sheets of the right thickness are rolled on to the built up fabric, first on the one side, then the other, and the assembly run through squeeze rolls.. Extruded strips are then applied to the edges. The belt is vulcanized in long presses which may be 30 feet long by 6 feet wide. The belt is being stretched during vulcanization.
Transmission Belts
Transmission belts are generally much narrower than conveyor belts. the fractioned canvas is slit into strips of the requisite width. These are then assembled in long table, pass through squeeze rells and finally wrapped by a ply of fractioned duck.
The another type of transmission belts are made by assembling the requisite member of full width of fractioned canvas, vulcanizing, and then cutting to the desired width. The edge are sealed with a coating of rubber solution.
V-belts
V-belts are generally constructed of a top layer of rubber ,a cord section, situated at the neutral axis, and a base or cushion rubber, the whole assembly being surrounded by a fabric jacket. The shorter belts are manufactured on rotable collapsible drum formers. The belts are subsequently vulcanized in multi-ring mould in open steam.
The long-length belts are built on twin-drum building machines. The belts are vulcanized endlessly by moulding in a press under controlled stretch conditions.
After manufacture, the belts are checked for length and made up into matching sets.

New Words and Expressions

1. purpose 目的,用途
2. conveyor 运输机
3. conveyor belt 运输带
4. transmission 传递
5. power transmission belt 传动带
6. flat transmission belt 平型传运带
7. V-belt 三角带
8. warp 经线
9. warp thread 经线
10. load 装载
11. weft 纬线
12. weft thread 纬线
13. fastener 将东西扣牢之物,连接件,搭扣
14. fasten 坚固,使固定
15. firm 坚固地,坚定地,稳定地,商号,商行
16. preparation 制备
17. dry 干燥的,使干燥
18. series 连续,系列
19. a series of 一系列,一连串,一套
20. top 顶部 最高的
21. bowl 碗,碗状物
22. bottom 底,底部 最底的,最后的
23. interstices 布孔,布眼
24. repeat 重复
25. prevent 防止,预防
26. convey 输送
27. conceivable 可以想象到的
28. duck 帆布,鸭
29. tough 坚实,厚实,结实
30. corrosion 腐蚀
31. attack 攻击,进攻
32. squeeze 挤压
33. consolidate 使结实
34. edge 刀口,边缘.棱
35. stretch 伸展.拉伸.拉紧
36. narrow 狭的,窄的
37. canvas 帆布
38. slit slit , slit; slit, slitting 切开,扯裂
39. requisite 所需的
40. seal 封闭,密封
41. solution 解决,解答,溶解,溶液
42. rubber solution 胶浆
43. construct 建造,造句,作文
44. section 部分,片断,部门,节(文章)
45. situated 位于,坐落在………..
46. neutral 中央的,中心的
47. neutral axis 中心轴
48. cushion 垫子,垫层
49. rotable 可旋转的
50. collapsible 可拆卸的
51. subsequently 接下来
52. multi 多
53. ring 环,指
54. multi- ringmould 多环模
55. long-length belt 长带
56. twin 双的,挛生的,挛生子
57. twin-drum building machine 双鼓成型机
58. match 匹配
59. matching sets 匹配成组