SU665787A3 - Sheet material in multi-roll calender method and apparatus for restoring pneumatic tyres - Google Patents

Description

(54) METHOD FOR RECOVERING COATINGS

PNEUMATIC TIRES AND DEVICE FOR IT

IMPROVEMENTS

relative to the direction of extrusion of the material percolki.

These features of the method of repairing the tires and the structural design of the device for its implementation make it possible to apply a high-quality coating of a given thickness in one turn of the frame, which helps to increase the productivity of the recovery process.

FIG. 1 shows a device for restoring tires of pneumatic women; in fig. 2 - matrix; in fig. 3 - the same in disassembled form; in fig. 4 is the same, front view; in fig. 5 shows section A-A in FIG. one; in fig. 6 is a sectional view of B-6 in FIG. 2; in fig. 7 is a section bb of FIG. 2

A device for restoring pneumatic tires covers comprises a spindle 1 for squeezing an elastomeric material under pressure, connected to an injection molding head 2, a matrix 3, and a rack 4 for fastening a carcass of a restored cover with a drive (not shown in the figures).

The matrix 3 contains the upper 5 in the direction of rotation of the carcass of the restored tire and the lower 6 plates, having heating plates 7 and 8, respectively, and tightening brackets 9. The outlet of the matrix is formed by the lower 10 and upper 11 restrictive plates and lateral elements 12 and 13. In order to create an excess of material between the outlet channel of the matrix and the surface of the carcass of the restored lining, the upper limiting plate 11 is installed closer to the surface of the carcass than the bottom, and 12N marketing elements 13 are formed with upper 14 and lower 15 and 16 and the ribs 17 limiting.

The distance between each pair of 14, 16 and 15, 17 restrictive ribs is somewhat greater than the distance between the restrictive plates 10 and I. To regulate the flow of extruded material over the cross section of the matrix outlet channel, the regulator is installed in the latter in the form of a transverse relative to the extrusion direction of the material of the partition 18, mounted on the plate 19. The latter is inclined with an inclination on the plate 6. The partition 18 is made with a variable height along its length, with the highest section located in the center of the outlet channel. The flange low portions of the partition provide the stock build-up for the tread sidewalls.

The side elements 12 and 13 are installed with the possibility of adjusting the width of the outlet part of the exhaust channel; for this, they are equipped with toothed racks 20 and 21, which interact with the gear gears 22 and 23 (Fig. 4) mounted on

levers 24 and 25, which are manually brought into rotation.

The proposed method for repairing tires of pneumatic tires on this 5 device is carried out as follows.

The retractable tire 26 to be processed is secured to the stand 4, and the side members 13 and 12 are adjusted to interact with the sidewalls of the tire carcass.

Then the tire 26 is driven into rotation and through the die outlet channel — the elastomer is extruded under pressure.

15, a material 27. In this case, between the outlet channel of the matrix and the surface of the frame of the treated lining, an excess of the extruded material 27 is formed compared with the amount necessary for the formation of a given thickness of the annular coating of the undertreading layer 28.

The extruded material is entrained by the rotating cover 26, and a sub-tread layer is formed on its surface.

5 28 given thickness. To obtain a predetermined thickness of the undertread layer 28, the rotational speed of the tire 26 is coordinated with the feed rate of the elastomeric material by the syringe machine 1.

0 After the formation of the annular under-tread layer, the tire is removed from the pillar 4 and sent for vulcanization.

The proposed method and device provide fast filling irregularities

5 on the surface of the tire carcass and the formation of a predetermined contour of the finished undertread layer and a constant rolling radius of the restored tire along its entire perimeter.

Claims (4)

1. A method of repairing tires pneumatic tires, which consists in extruding an elastomeric material onto a rotating tire carcass through a matrix interacting with its surface, characterized in that, in order to improve the performance of the tire recovery process, between exhaust 0, the channel of the matrix and the surface of the frame form an excess of extruded elastomeric material as compared with the amount necessary for the formation of a given thickness of the annular coating, five 2. An apparatus for carrying out the method of claim 1, comprising a syringe machine for squeezing an elastomeric material under pressure and an array connected to its injection head, the discharge channel of which 0 is formed by lower and upper in the direction of rotation of the frame with restrictive plates and lateral elements interacting with the sides of the frame, characterized in that the upper limit plate is installed closer to the surface of the frame than the bottom, and the side elements are made with the upper and lower but the direction of rotation of the frame bounding ribs. 3. A device in accordance with claim 2, characterized in that a distributor is installed in the latter for controlling the flow of the extruded material over the cross section of the matrix output channel. 4. A device according to claim 3, characterized in that the distributor is made transverse to the direction of extrusion of the material of the partition wall. Sources of information taken into account in the examination 1. UK patent number 1353903, cl. In 5A, published .. 1974. 1rig.1 at 72 13 24 iZ Vui.S 7J