SU1442423A2 - Apparatus for making pneumatic tyres - Google Patents

Abstract

The invention relates to the manufacture of tires for vehicles and is intended to push the tread and sidewalls onto the poker carcass by injection molding. The purpose of the invention is to increase productivity. For this, the device is equipped with means for returning the diagrams 13 to the initial position. This tool is performed

Description

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None in the form of semi-circular parts 29, Parts 29 are mounted on the transition unit 26 and can be rotated in a vertical plane and have grooves for interaction with the radial ribs 27 of the transition unit. After the mold cavity is filled with rubber mixture 24., The casting unit 10 is retracted from the mold. The half-ring portions 29, for the levers 32, rotate in a vertical plane relative to the axes 31 and move into the working zone of the device. Their grooves interact with the ribs 27, obes-. The centering of the portions 29 is then applied. The elements 11 and the portions 29 are then applied through the diaphragms 13 to the hermetic chambers 21, removing the working medium from them and returning the diaphragms to their original position. 3 il.

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The invention relates to the manufacture of tires for vehicles, intended for application of the tread and. sidewalls on the frame poklpek casting method under pressure and is an improvement of the invention according to ed. St. No. 1260242.

The purpose of the invention is to increase productivity.

FIG. 1 shows the proposed device in the working position; in fig. 2 is the same at the moment the diaphragm returns to its original position J in FIG. 3 - the same, cross-section along the equatorial plane of the tire.

A device for making tires of pneumatic tires comprises a split mold with an annular casting slit a along the plane of the connector, the top 1 and the lower 2 half-molds and with a core 3 of variable stiffness. Concentric to the upper half-mold 1 with axial movement, a drive locking sleeve 4 is installed with an annular insert 5 that is axially movable relative to it 5. The movement of the liner 5 relative to the sleeve 4 is limited by means of a screw 6. The upper 1 and lower 2 half-shapes are attached to the upper 7 and lower 8 plates with the help of bolts 9. In the device, there is an injection unit 10, which contains an annular body, consisting of detachable half-ring elements 11 and 12, mounted with the possibility of radial movement relative to but the mold, and located in the boot KaiMepe case

an annular plunger formed by elastic diffractions 13 and 14 fixed along the perimeter on elements 11 and 12. The diaphragms 13 and 14, upper and lower relative to the equatorial plane of the tire, are fixed to elements 11 and 12 by means of ring clamps 15 and 16 and bolts 17, and left and on the right ends, using brackets 18 and 19 and bolts 20. Brackets 18 are welded to elements 11 and 12.

The annular plunger drive is made in the form of sealed chambers 21 and 22 placed in cavities between the half-ring elements 11 and 12 and the diaphragms 13 and 14. The chambers 21 and 22 have the shape of torus parts and are equipped with means 23 for supplying pressurized working medium, such as oil Between the injection molding unit and the mold there is a transition assembly consisting of detachable half-ring parts 24 mounted with the possibility of radial movement relative to the mold. Each of the spine-shaped parts is formed by the lower 25 and upper 26 collars, the adjacent ends of which are interconnected by radial ribs 27 and 28. The lower 25 and upper 26 collars have annular grooves b and 15 and 16. In the upper collars 26 also an annular groove c, and on an annular insert 5 —an annular protrusion for engagement with the groove c. Since the ring insert 5 has the ability to

movement through the locking sleeve 4, then a reliable centering and tight connection of the transition unit with the mold is provided. At the same time, if during operation of the device the rubber mixture enters the system: protrusion b - groove c, the docking and sealing of the transition unit and the mold is still ensured due to the self-alignment of the insert 3.

The device is equipped with a device for returning the diaphragms to the initial position, consisting of osecting j junction semi-ring parts 29 and 30, mounted with the possibility of rotation in a vertical plane relative to axis 31 on the transition node with the help of lever 32 and having grooves for interacting with radial edges 27 and 28 of the transition node. The cross-sectional shape of each of the half-ring portions 29 and 30 corresponds to the shape of the cavity formed by jc elastic diaphragms 13 and 14 in the initial position and radial ribs 27 and 28 of the transition unit.

To heat the mold at the top

I and the bottom 2 half-forms, elements

II and 12, the cages 24 of the transition assembly are made of sockets e for the installation of electric heaters. Outside, the casting and transition units and the mold are locked with a drive ring 33 (not shown). 35

The device works in the following way.

I

In the initial position, the elements 11 and 12 and the half-ring parts 24 of the transfer unit are retracted from the press mold. A rubber mixture 34 is inserted into the loading chamber manually or by means of a syringe machine. The diaphragms 13 and 14 are in the initial position. A core 3 with a carcass of tire 35 is installed along the central axis of half-molds 1 and 2. After this and to the mold, the annular parts of the transition unit are first fed with a drive, and then the elements 11 and 12 are locked with a drive 33 The closure sleeve 4 is in the upper position at this time. This is done by centering and sealing. casting and transitional nodes due to the interaction of the clamps 15 and 16 with the grooves b, and the transitional node and the press 30

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Forms - due to the interaction of the projection d with the groove c. Thereafter, through the means 23 in the cavities of chambers 21 and 22, the working medium is supplied under pressure, as a result of which chambers 21 and 22 increase in volume, and diaphragms 13 "and 14 displace rubber mixture 34 into a cavity bounded by lower 25 and upper 26 clips and ribs 27 and 28 of the transition unit, and then through the annular gating slit a into the forming cavity of the mold formed by the outer surface of the frame 35 and the inner surface of half-molds 1 and 2. After filling the forming cavity, the closure sleeve 4 lowers and overlaps the gating slit a. After that, the injection of the working medium is stopped, the pressure in the injection molding unit is released, the encircling ring 33 is lowered by means of an actuator, and the injection molding unit is withdrawn by means of an actuator. The excess rubber mixture remains in the space of the transition unit, bounded by the lower 25 and upper 26 collars and ribs 27 and 28. With the help of nature, the semi-ring portions 29 and 30 are rotated by the lever 32 relative to the axis 31, turned into the working area of the device and centered on the edges 27 and 28 transition node. Thereafter, elements 11 and 12 of the injection molding unit are connected to the mold using a drive. The outer surface of the semi-annular parts 29 and 30 of the additional unit acts on the elastic diaphragms 13 and 14 and returns them to their original position, displacing the working medium from the sealed chambers 21 and 22. The injection unit is then removed by means of an actuator for filling the new batch of rubber compound - The outer parts 29 and 30 of the subassembly are rotated relative to axis 31 on the transition node by means of an actuator and lever 32 and are moved out of the working area to the initial position. A transition assembly with an excess of rubber compound is discharged from the mold by means of an actuator.

After removal of the injection and transition units from the mold, tire vulcanization is performed in it. When the tire is vulcanized, the upper plate of the press 7 with the upper floor of the mold 1 and the locking sleeve 4 placed on it 4 and the bucket 5 raising

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Editor A. Kozoriz

Order 6347/17

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

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Compiled by V. Baturov

Tehred A. Kravchuk Korrektor M. Maksimishinets

Circulation 559

Subscription

Claims (2)

Claim A device for the manufacture of pneumatic tire tires according to Auth. No. 1260242, characterized in that, in order to increase productivity ,. it is equipped with means for returning the diaphragms to their original position, made in the form of semi-ring parts mounted on the transitional node with the possibility of rotation in the vertical plane and having grooves for interaction with the radial ribs of the transitional node. 2 * 34 e 3 / Compiled by V. Baturov Editor A. Kozoriz Tehred A. Kravchuk Proofreader M. Maximishinets Order 6347/17 Circulation 559 Subscription VNIIIPI of the USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and printing company, Uzhhorod, st. Project, 4