SU605371A2 - Drum for assembling and forming pneumatic tyres - Google Patents

Abstract

DRUM FOR ASSEMBLY AND FORMING rrOKPMlliEK PNEUMATIC 'PIHH on auth.St. No. 568239, characterized in that, in order to ensure uniform distribution of the cord threads in the sidewalls, the centers of the hinges connecting the center and side groups of sectors are located from the outer surface of the sectors in a folded position at a distance greater than the similar distance of the centers of the hinges connecting lateral groups of sectors with shoulders.

Description

The invention relates to equipment of the mud industry and can be used to assemble pneumatic tires of radial design.

A drum for assembling and forming tires for pneumatic tires is known. The drum consists of radially movable, pivotally interconnected central and two lateral groups of sectors, an elastic sheath, a mechanism for radial dilution, sectors made in the form of levers pivotally connected to the sectors and movable along the shaft of the drum by ring sliders, and shoulders for landing side rings.

In such a design, to remove the tires, the initial initial diameter of the drum should be made relatively small relative to the diameter of the bead rings, i.e. create a large gap between the bead rings and the cylindrical surface. With a small gap in the sector of the side groups during the transformation of the toroidal shape of the drum into a cylindrical one, they rest against the sides of the pokryshka and stretch them, removing all the surfaces and making them unsuitable for further processing,

With a large gap, i.e. with a small Initial diameter for planting the side rings, it is necessary to unclench the drum by a significant amount, which will reduce the density of the cord threads in the frame and therefore reduces the strength of the cord layers,

Another drum for assembling and shaping pokapek pneumatic tires is known, containing radially expandable, articulated central and two side rfjynnH sectors, elastic sheath, mechanism for radial dilution of sectors, filled in the form of rods of chag, articulated to sectors and with annular sliders moving along the shaft of the shaft, shoulders for seating the bead rings, the sectors of the side groups being made with notches. The last drum is closest to the invention. Its disadvantage is the uneven distribution of the cords in the sidewalls. The purpose of the invention is to ensure uniform distribution of the threads in the sidewalls. For this, the centers of the hinges connecting the central and lateral groups of the sectors are located from the outer surface of the sectors in a folded position at a distance greater than the similar distance of the centers of the hinges connecting the lateral groups of the sections with the shoulders. Fig, 1 shows the drum being described, longitudinal section; in FIG. drum at the time of forming pokry; on fig.Z - view of the central and lateral groups of sectors in the initial position; in FIG. 4, that heh, at the time of forming, the drum contains radially sliding, tarnishly interconnected sectors 1 of the central and two and 3 side groups, an elastic sheath 4. The central sectors 1 are connected by pivots 5 and 6 with the lateral groups of sectors 2 and 3, after which, by means of the axes 7 and 8, are hingedly connected with the shoulders 9, which are mounted on the slats 10 with the possibility of axial movement along the horizontal axis of the drum. The shell 4 is attached to the shoulders 9 by sectors 11 with protrusions 12 for fitting and fixing the side rings. The strips 10 are mounted on the outer surface of the ring cylinder 13 in which the pistons 14, 15 and 16, 17 are installed, the pistons 14 and 5 are articulated with the central sectors 1 using levers 18 and 19, returning pistons 14 and 15 to their initial position is done by springs 20 and 21, the annular cylinder 13 is divided by partitions .2 and 23, pistons 16 and 17 are connected by hinge 24 and 25 with hinges, returning pistons 16 and 17 to their original position produced by the springs 26 and 27, the working agent under the pistons 14 and 15. lead through the pipeline 28, and under the pistons 16 and 17 through the pipeline 29, the lateral groups of sectors 2 and 3 are filled with notches a. The centers of the hinge axes 5 and 6 are located from the outer surface of sectors 1, 2 and 3 in the folded position at a distance b, which exceeds the same distance in the centers of the axes 7 and 8 (see Fig 3). The drum works as follows. On the drum in the initial cylindrical position lay layers of cord 30 (Fig, 3). According to the pipeline 29, the working agent is supplied, the pistons 16 and 17 are shifted (from the middle of the drum along its shaft and the springs 26 and 27 are compressed; With the levers 24 and 25, the pistons 16 and 17 raise the strips 10 with the shoulders 9 and the sectors 1, the central sectors 1 through The levers 18 and 19 act on the pistons 14 and 15, moving them slightly along the shaft, thereby creating stability for the strips 10. In the unlocked position of the drum, the bead rings 31 (see, FIG. 3) are fitted and the ends of the cord are turned onto the bead rings. the working agent is fed through line 28, and the pistons 14 and 15 begin to come closer, radially from the center by means of levers 18 and 19 of sector 1, a trapezoidal section of sectors 1, 2 and 3 is formed. When a trapezium is formed, the lateral sectors 2 and 3 rotate around the hinge axes 5 and 6 of the central sectors 1 and rotate around the axes 7. and 8 on the shoulders 9, the magnitudes of the beats are analytically or graphically selected so that the length of the trapezium perimeter increases by the amount allowed to extend the cord threads between the bead rings, since the lengths of the threads after turning the cord ends on the bead rings are fixed by these rings. This elongation creates an increasing tension along the threads of the carcass and thereby prevents the occurrence of any curvature of the threads during the molding and non-uniform discharge of them, mainly in the sidewall zone. When a trapezium is formed, the central sectors 1 are affected by the radial forces generated by the levers 18 and 19, these forces are transmitted to the side sectors 2 and 3, and in axes 7 and 8 the forces are decomposed into vertical and horizontal components. The horizontal components are provided with the shoulders 9 without any additional TT. The rotary mechanisms move toward the middle of the drum when the skeleton is molded, which simplifies the design of the device as a whole. After the tire carcass has been molded, a breaker, tread and sidewalls are put on it and duplicated them to the carcass (see Fig 2). Then, the bar is compressed and the tire is removed.

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Claims (1)

DRUM FOR ASSEMBLY AND FORMING TIRES OF PNEUMATIC TIRES on auth.St. No. 568239, characterized in that, in order to ensure a uniform distribution of cord threads in the sidewalls, the centers of the hinges connecting the central and side groups of sectors are located from the outer surface of the sectors in a folded position at a distance greater than the same distance of the centers of the hinges connecting the side groups of sectors with shoulders. § - ω with I out rings, i.e. create a large gap between the bead rings and the cylindrical surface. With a small gap in the sector of the side groups during the transformation of the toroidal shape of the drum into a cylindrical, they rest against the sides of the tire and stretch them, removing the entire tire and making it unsuitable for further processing. With a large gap, i.e. with a small initial diameter for planting the side rings, it is necessary to unscrew the drum by a significant amount, which reduces the density of the cord threads in the tire carcass and therefore & reduces the strength of the cord layers.