SU853937A1 - Drum for assembling and forming pneumatic tyres - Google Patents

Abstract

DRUM ASSEMBLY AND MOLDING pneumatic tires comprising a radially sliding pivotally associated between a central and two side groups of sectors covered elastic element fastened to the shoulders fit bead cores, and a mechanism for radial dilutions sectors, characterized in that, in order to increase the quality of the manufacture of tires due to the uniform stretching of the cord frame during molding, the elastic element is made in the form of a shell connected to the source of supply of the working medium.

Description

The invention relates to equipment for the tire industry, in particular to machines for assembling tires for pneumatic tires of radial design in one stage.

A drum for assembling and forming tires of pneumatic tires is known, made in the form of an elastic sheath, the internal cavity of which is connected to a source of compressed air supply.

Known drum does not provide the accuracy of the geometric dimensions of the tire.

Another drum for assembling and forming pneumatic tires tires is also known, which contains radially sliding hinged central and two side groups of sectors, covered by an elastic element fixed in the shoulders of the landing side rings, and a mechanism for radial dilution of the sectors.

 Have

The disadvantage of this drum is the unevenness of stretching the tire cord carcass.

The purpose of the invention is to improve the quality of tires due to the uniform stretching of the cord frame.

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This goal is achieved by the fact that the elastic element is made in the form of a shell associated with a source of supply of the working medium.

FIG. 1 shows a drum, a longitudinal section; in fig. 2 - the same, intermediate position. When forming a tire: in FIG. 3 - the same, the final position in the molding tire.

The drum contains a radially sliding hinge interconnected central group of sectors 1 and two side groups of sectors 2 and 3, an elastic shell 4 connected to a source of compressed air supply. Sectors 2 and 3 of the side groups are hinged by their outer ends with sliders 5 and 6, which are equipped with a comb 7 with teeth (Fig. 2). Sectors 2 and 3

side panels are made with notches a. The ridges 7 in the initial position are located above the level of sectors 2 and 3 of the side groups and the teeth are covered with recesses when applying layers of cord.

The slides 5 and b are mounted on slats 8, made in the form of guides along which the sliders are capable of moving in the axial direction.

The groups of sectors 1-3 are covered from above with an elastic sheath 4, the ends of which are fixed on the ends of the sliders 5 and 6 with the help of sectors 9. Sectors 9 have protrusions for fitting the bead rings (Fig. 3). The strips 8 are mounted on enclosures.

10 and 11 power cylinders in which pistons 12 and 13 are mounted. In housings 10 and

11 force cylinders, partitions 14 are installed, separating the housings 10 and 11 on cavities C, D, E, E. in which pistons 12 and 13 are placed. Pistons 12 are hingedly connected by means of levers 15 to the central group of sectors 1. Pistons 13 are hingedly connected arms 16 with strips 8. Pistons 12 and 13 are returned to the initial position by means of springs 17 and 18. The working agent in cavity D and D comes through the air duct

19, and in cavity B and B - through the air duct

20. Air ducts 19 and 20 are made in

shaft drum 21.

The operation of the device is as follows.

Layers of cord 22 are applied to the drum in the initial cylindrical position (Fig. 1), the working agent is supplied through the air duct 20, and the pistons 13 begin to move from the middle of the drum along the shaft 21, compressing the springs 18. With the levers 16, the pistons 13 raise the slats 8 with sliders 5 and 6 and sectors 1-3 so that the side rings can be planted together with layers of cord on the protrusions of sectors 9. Landing rings are planted and the cord layers are turned on

of them. The working agent is supplied via the air line 19 under the pistons 12, which approach the center of the drum. The levers 15 unclench the central group of sectors, causing the sliders 5 and 6 to move along the bars 8

to the center of the drum.

. In this way, a trapezoidal toroid is formed. Compressed air is then introduced into the internal cavity of the elastic sheath 4, on which a cord frame is molded. At the end of the molding, the compressed air is lowered from the elastic shell 4, the shell fits snugly to the drum toroid, and the molding process is completed on a rigid drum.

After the frame is molded, a belt, tread and sidewalls are laid on it. All items duplicate, i.e. opressovyvayut or rolled. Ready tire is removed from the drum after

its return from the toroidal position to the cylindrical one. For this, the working agent is released from under the pistons 13, and the slats 8 with sliders 5 and 6 and groups of sectors take the initial initial position, freeing the bead of the tire from the projections on sectors 9.

After that, the working agent is released from under the pistons 12 and under the action of the springs 17 the central group of sectors 1 moves

to the center. In this case, the tire beads enter and slide into the grooves. Then the cycle repeats.

Thus, the proposed device will significantly improve the quality of manufactured tires. 5 / 7T

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Claims (1)

A DRUM FOR ASSEMBLING AND FORMING PNEUMATIC TIRE TIRE TIRES, containing a radially sliding pivotally interconnected central and two side groups of sectors covered by an elastic element fixed to the shoulders of the landing rings, and a mechanism for radially diluting sectors, characterized in that, in order to improve the quality of manufacture tires due to the uniform drawing of the cord frame during molding, the elastic element is made in the form of a shell associated with the supply medium of the working medium. 1