SU897567A1 - Mould for vulcanisation of endless wedge belts - Google Patents

Description

one

The invention relates to the manufacture of rubber technical products, namely the production of V-belts.

Closest to the proposed technical essence and the achieved result is a mold for vulcanization of endless V-belts, containing upper and lower clamping plates - hot and low matrix plates having parallel grooves for placing belts on the upper and lower sides 1.

When molding and curing the belt blanks in such a mold, an excess of material, mainly the rubberized fabric of the wrapping layer, is squeezed out of the profile grooves into the gaps between the matrix and the smooth plates before they are closed. As a result, on a larger base of the vulcanized strap, tissue burrs are formed, which are cut off during final processing or during the operation of products. Thus, the continuity of the wrapping layer of the belts is broken, which leads to accelerated. No way out of their line. Besides.

smooth upper and lower plates. The mold, of known construction, allows the manufacture of belts with only a straight, large base. Ts.-Kie belts have insufficient transverse rigidity and, therefore, performance, because when bending on the pulleys with simultaneous transverse compression of their greater

10, the base becomes concave.

The purpose of the invention is to increase the durability of the belt. An additional goal is to increase stiffness.

it is shorter.

This goal is achieved by the fact that

15 a mold comprising upper and lower pressure plates and a middle matrix plate having parallel grooves on the upper and lower sides

20 for accommodating belts, provided with punches placed on the upper and lower plates in accordance with the location of the profile grooves,

25, the profile grooves are made in the upper part with areas for placement of punches having vertical side walls, and the section of the profile grooves is equal to 1.2530 -1.5 belt heights.

In addition, in order to increase the stiffness of the belt, the forming surface of the punches is made concave with a radius of curvature chosen equal to 2.0-4.0 of the width of the larger base of the belt.

FIG. 1 shows the mold side view; in fig. 2 is the same, type l, above; in fig. 3 - section aa on

FIG. 2

The mold contains the upper I and lower 2 pressure plates and the middle plate-matrix 3. The latter has parallel wedge-shaped grooves 4 located on its upper and lower sides for placing the belts. On the top 1 and bottom 2 plates are placed in accordance with the location of the grooves 4 punches 5 having a concave surface 6. The upper 1 and lower 2 plates, as well as the matrix plate 3, have sections 7 with channels 8 for supplying coolant. The central part of the plates is heated. The profile grooves are made in the upper part with areas for placement of punches having vertical side walls 9, and the depth h-i of the grooves 4 is equal to 1.25-1.5 of the height h of the belt.

The mold works as follows.

Sections of the belt blanks are placed in the upper and lower profile grooves 4 of the plate-matrix 3. Then the upper 1 and lower 2 plates are closed with the matrix-plate 3. At the same time, the punches 5 are placed in the upper part of the profile grooves 4, pressing the blanks. After the first sections of the preforms are vulcanized, the mold is opened, the following sections of the preforms are placed in the profile grooves 4, and all operations are repeated. During the whole operation time of the mold, coolant is supplied through the channels 8.

The proposed mold for vulcanizing V-belts provides higher quality belts without fabric burrs, with stable cross-sectional dimensions and increased transverse rigidity, which significantly increases their durability. The operational tests of the 45x22x4000 wedge variable speed belts, vulcanized onto the mold of the proposed design in the drive gear of the combine harvesters, showed that their average service life increased 1.5 times compared to the belts vulcanized into the mold of a known design.

Claims (2)

1. A mold for vulcanization of endless V-belts, containing upper and lower clamping plates and an average matrix plate, having parallel grooves to accommodate belts on the upper and lower sides of the belt. so that, in order to increase the belt durability, it is equipped with punches placed on the upper and lower plates in accordance with the location of the profile grooves, The profile grooves are made in the upper part with areas for placement of punches having vertical side walls, and the depth of the profile grooves is chosen equal to 1.25-1.5 of the height of the belt. 2. A mold according to claim 1, characterized in that, in order to: increase the rigidity of the belt, the forming surface of the punches is made concave with a radius of curvature chosen equal to 2.0-4.0 of the width of the larger base of the belt. Sources of information taken into account in the examination 1. US patent 2602188, CL.425-28, published. 1949 (prototype). T- 7 7