SU1754472A1 - Additional drum for assembly of air tires - Google Patents

Abstract

Use: in the tire industry when assembling tires of pneumatic tires. Invention: an additional drum is provided with additional rollers mounted on the free ends of the second arms for interacting with the sectoral sector. The levers are articulated. The second power cylinder is mounted for axial movement along the drive shaft. The elastic element is mounted on the inner surface of the end part of the sectors with the possibility of axial movement. 6 ml.

Description

The invention relates to equipment of the tire industry and is intended for the assembly of pneumatic tires.

tires,

A drum for tire assembly is known, comprising radially extending sectors mounted on a drive shaft forming the working surface of the drum. The mechanism for radial dilution of the sectors is made in the form of systems of intersecting levers that are articulated at one end with the sectors. Some of the leverage systems are articulated with their second ends to an axially movable sleeve, while the other levers are articulated to the rigidly fixed sleeve with their second ends, mounted rollers for interacting with grooves made in sectors located on one side relative to the central axis of symmetry of the drum. In the end part of the radially sliding sectors rigidly mounted annular elastic elements.

However, the articulation of levers with sectors by means of rollers and grooves does not allow changing the position of the shell during its axial movement to the assembly drum depending on the state of the duplicated surface (irregularities formed by joints, folds, etc.), which reduces duplication quality.

In addition, placing the rollers inside the closed grooves made in the sectors complicates the design and makes it difficult to access the rollers during installation work. The elastic elements fixedly fixed at the ends of the sectors provide the necessary clearance between the additional and main drums only for a given tire size, and the size of the gap depends on the manufacturing accuracy, and mounting the levers on the movable bushes requires the use of a special drive and complicates the design.

Also known is an additional drum for assembling tires of pneumatic tires, which have radially movable sectors mounted on the drive shaft, a mechanism for radial movement of sectors, made in the form of axially mounted axially mounted on the drive shaft, and one arm-mounted system of levers on power cylinder housings, one of which is pivotally connected to sectors, and the second ones are provided with rollers at their free ends for interacting with sectors, and ring elastic elements installed on sectors facing the main drum.

The disadvantage of this drum is that it is difficult to move the sectors in parallel, since the individual power cylinders cannot synchronously interact with the levers associated with the corresponding sectors in pairs, which leads to uneven tension of the niord in the area of the side ring, reducing the quality of assembly

In addition, when layers are rolled onto the side ring, the cord between the ends of the radially separated sectors facing the main drum is not duplicated, since there are no rollers in these gaps, i.e. there is nothing to duplicate, which requires a subsequent operation — rolling these sections of layers

At the same time, the radial dilution of the sectors is carried out by stretching the rubber cuffs, which reduces their performance and service life, since the oil-resistant rubber brands used in the manufacture of pneumatic device cups in general engineering have sufficient rigidity, wear resistance and durability, are not designed for multiple elastic strain strain.

The purpose of the invention is to improve build quality, increase productivity and expand technological capabilities.

This goal is achieved by that the additional drum is provided with additional rollers mounted on the free ends of the second levers for interacting with sectors, levers are hingedly connected to each other, the second power cylinder is mounted for axial movement along the drive shaft. The elastic element is mounted on the inner surface of the end part of the sectors with the possibility of axial movement.

FIG. 1 shows a drum for assembling pneumatic tires, section; Fig 2-6 - successive stages of the mechanisms of the drum.

The drum contains mounted on

the drive shaft 1 has radially moving sectors 2 and a mechanism for radial movement of the sectors, made in the form of power cylinders 3 and 4 mounted on the drive shaft 1. The power cylinder 3 is mounted for axial movement. On the housings of the power cylinders 3 and 4, a system of levers 5, 6 arranged crosswise and

5 are closely related. Levers

5 are hinged to sectors 2. Levers

6 are equipped with rollers 7 fixed on hinges 8 and interacting with sectors 2. On levers 6 on axles x 9 pivotally

0, additional rollers 10 are mounted to interact with sectors 2. On the ends of sectors 2 facing the main drum, annular elastic elements 11, for example springs, are installed by means of holders 12 and bolts 13.

The holders 12 have longitudinal axes for axial movement of the elastic elements 11 relative to the sectors 2. Inside the bodies of the power cylinders 3, 4

0, pistons 14 and 15 are located, rigidly fixed on the hub 16. Channels 17 and 18 serve to supply air to the A and B annular pneumatic cylinders. Cases 3 and 4 are in the initial position

5 are located at a distance I from each other, defined as I h hi, where h and hi are the working movements of shells 3 and 4, and are selected according to the diameters of the open and folded drum constructively

The drum works as follows. Before assembling, loosening the bolts 13, move the holders 12 and set them at a distance of a-5-10 mm relative to the ends

5 sectors 2 depending on the thickness of the wrapped layers of the cord and the width of the side wing (these distances are specified during the assembly process). Then tighten the bolts 13

0 When air is supplied through channel 17 to the cavity A of the cylinder body 3, the latter moves in the direction towards the main drum 19, acting through the levers 6 on the levers 5. 8 by turning the levers 5

5 and 6 sectors 2 are radially unfolded and simultaneously move along the rollers 7 axmally to the shoulders of the drum 19 until they stop, forming a continuous working surface with the outer surface of the main drum 19 for application and docking.

20 layers of cord (see fig 3) Then the sectors 2 of the drum fold For this, the air from cavity A through the valve 17 is vented to the atmosphere. Due to the elastic element 11 of sector 2, by acting on the levers 5 and b, through the rollers 7 and the hinged joints move the cylinder body 3 from the drum 19 to its original position. Thereafter, the layers of cord are compressed along the arms of the main drum 19 and the bead rings 21 are seated.

To turn the layers of cord 20 onto the wing, the drum sectors 2 are radially expanded, followed by inclination of the latter relative to the longitudinal axis of the main drum 19. For this, compressed air is fed through the channel 18 into the cavity B of the cylinder body 4, which moves to full speed in the direction from the main drum 19, turning the levers 5 and 6 and moving the sectors 2 in the radial direction parallel to the axis of the drum 19 (FIG. 5} until the inner surface of the sectors 2 contacts with the ropes 7. With further rotation of the levers 5 and 6, the rollers 7 come out of contact with the inner surface of sectors 2. Then, rollers 10 come into contact with sectors 2, which increase the total length of the arms b so that they rotate sectors 2 relative to the hinges of the arms 5, setting them at an angle to the longitudinal axis of the drum 19. When This elastic element 11, moving together with the sectors 2, runs tightly around the layers of the cord, wrapping them on the wing, and the shells 4 and 3 come into contact with each other with their ends. Next, compressed air is supplied to the cavity A of the cylinder body 3 through channel 17 and discharged from the cavity B of the cylinder body 4, while the body 3 together with the body 4 and sectors 2 moves to the drum 19 at full speed, wrapping and duplicating its cords on the wing with an elastic element 11 (Fig 6)

Next, air is supplied to the cavity B of the cylinder body 4 and is vented from the cavity A of the cylinder body 3, with the bodies 3 and 4 being withdrawn from the main drum 19 for a full stroke hi equal to h, after which the air from the cavity B is discharged. Under the influence of the elastic element 11, the sectors 2 through the levers 5 and 6 move the cylinder body from the body 4 by the value I, occupying the initial position (figure 2).

Then the cycle repeats.

Claims (1)

Invention Formula An additional drum for assembling tires of pneumatic tires, comprising radially movable sectors mounted on the drive shaft, a mechanism for radially moving sectors, made in the form of power cylinders mounted on the drive shaft, one of which is mounted with the possibility of axial movement, and a system of levers hinged on the power cylinder housings, the first of which are hinged to the sectors, and the second are provided with rollers at their free ends , and installed on facing the main The drum ends of the sectors are annular elastic elements, characterized in that, in order to improve the quality of assembly, increase productivity and expand technological capabilities, it is equipped mounted on the free ends of the second arms by additional rollers for interacting with sectors, the lever is pivotally connected to each other, the second power cylinder is mounted with the possibility of axial movement along the drive shaft, and the elastic element is mounted on the inner surface of the end part of the sectors with the possibility of axial movement. 10 a H FIG. / / 7 Phie 3 20 19 / 1754472 20 21 ff