SU839734A2 - Machine for shaping pneumatic tyre bead - Google Patents

Description

(54) MECHANISM FOR THE FORMATION OF THE AIRBAG OF THE PNEUMATIC TIRE COVER

This does not ensure the simultaneous gripping of the edges of the carcass blank before crimping over the drum shoulders, since, while the outer arms located in the upper part of the assembly machine, under the action of their weight, the edges of the workpiece are clamped, the outer arms located in the lower part of the machine the weights are in the open position. Simultaneous gripping of the edges before the bead is formed causes the workpiece to tilt and the bead loose at the bottom of the tire.

The purpose of the invention is to provide simultaneous capture of the edges of the skeleton of the frame before the formation of the bead and eliminate the bias of the workpiece and the looseness of the bead in the lower part of the tire.

The goal is achieved by the fact that the annular springs mounted on the segmental support elements of the outer arms are divided in pairs into sections with oppositely directed turns.

External levers are provided with holes in which elastic rubber cords are installed.

Figure 1 shows a fragment of the mechanism of processing Öort with curved external Q arms; figure 2 - General view of the mechanism in the working position, a longitudinal section; on fig.Z - view along arrow A in figure 2; figure 4 is a view along arrow A in figure 2 when opening the outer and inner levers; on fig.Z - section bb on fig.Z; on figb - node

1 on figure 2.

The mechanism for forming the bead of a tire of a pneumatic tire comprises a hub 1 which is coaxially and movably mounted on a horizontally disposed shaft (not shown). Ring hub mounted on hub 1

2-stage power cylinder, inside of which is located the piston 3, which interacts with its end face with its longitudinal displacement limiter, made in the form of a nut 4, which is mounted on the threaded portion of the hub 1.

On the piston 3, which is the body of the second stage of the power cylinder, a piston 5 is installed, which interacts with the stop, made in the form of screws b mounted on the body 2 and limiting its longitudinal movement.

On the housing 2, the inner 7 and outer 8 levers are pivotally mounted in pairs in the circumferential direction. Segment support elements 9 and 10 are mounted on the free ends of the levers 7 and 8, respectively. Spring 11 is mounted on the support elements 9, and a spring 12 on the support elements 10 is composed of sections 13 with right-handed turns and sections 14 sec. left direction of turns. The levers 8 are provided with holes in which elastic rubber cords 15 are installed to tighten all the levers 8 when the pressure is released under the piston 5. The number of rubber cords 15 is chosen so that their force is sufficient to eliminate the hanging of the outer arms 8 in the lower circumferential part mechanism.

The mechanism works as follows.

To clamp the edges of the frame preform, compressed air is supplied to the cavity of the second stage of the power cylinder by the action of the piston 5, the levers 8 rotate in the longitudinal axial planes in the direction from the longitudinal axis of the mechanism to the diameter corresponding to the edge position of the workpiece under the action of the piston 3, the levers 7 rotate under the edge of the workpiece. After the pressure is released in the second stage of the power cylinder, the levers 8 are rotated in the opposite direction due to the compressive action of the rubber cords 15, and the edge of the carcass blank is clamped in the annular gap between the ring spring 11 and the sections 13 and 14 of the spring 12.

Further, when the levers 7 and 8 are forced to turn, in the direction towards the longitudinal axis of the mechanism from moving the template (not shown), the edge of the frame workpiece is deformed in the same direction. At the same time, due to friction forces, the cord material rotates the springs 13 and 14 around the axis by several turns.

depending on the height of the side of the tire and turns the spring 11 around an axis for part of the turnover. The springs 13 and 14 rotate to seal the deformable material towards the body of the lever 8 without bending the folds to one side due to the opposite direction of the turns of said springs, and the core part of the levers 8 corrugates the cord material in the gaps between the levers 7.

Claims (2)

Thus, the simultaneous rotation of the springs 13 and 14 does not create conditions for lateral bending of the levers 8, and they are not displaced relative to the template rollers. When turning the edges of the workpiece frame spring 13 and 14 and the ring spring. 11 rotates in the reverse direction, smoothing the compacted and corrugated material. The installation of springs with different directions of turns on the outer arms eliminates the side lengthening of the elongated levers when assembling heavy and large tires, prevents breakage of the strings and spring breakage from the segment support elements, and mounting of the stinging elastic cords simultaneously captures the edges of the frame blank. All this eliminates the looseness of the side of the bag, which increases the efficiency and durability of the mechanism, reduces downtime of the assembly equipment. Claim 1. Mechanism for forming a tire bead of a pneumatic tire according to the author. No. 674931, characterized in that, in order to ensure the simultaneous gripping of the edges of the carcass preform prior to the formation of the bead and eliminate the skewing of the workpiece and the bead looseness in the lower part of the tire, the spring springs are mounted on the segmental supporting elements of the outer arms into pairs with oppositely directed turns. 2. Pop-1 mechanism, characterized in that the outer arms are provided with openings in which elastic rubber cords are installed. Sources of information taken into account in the examination 1. USSR author's certificate 674931, cl. In 29 N 17/12, 1977, (prototype). Bu9a fuz.l B-6 Rig.6