RU2618067C2 - Device for regulating thickness of automobile tires tread blanks in their production process on worm machines - Google Patents

Abstract

FIELD: automobile production.

SUBSTANCE: device is mounted in the body of the tape directly in front of the shape of the hole of profiling slats, fastened together in the shape of the head of the worm machine. The apparatus includes mounted rotating and reciprocating movement of the adjusting pins, whose axes are located at the intersections of the plane perpendicular to the axis of rotation of the worm screw machine, with planes, parallel to the plane of symmetry and forming openings extending through the control points, which lie in its output section.

EFFECT: invention extends the functionality of the worm machine, which allows to directly reduce during the extrusion process operational control blanks tread thickness, and to improve the accuracy of dimensions at the control points, in compliance with process regulations without stopping the tread assembly equipment.

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Description

Technical field

The invention relates to chemical engineering and can be used in worm machines to obtain profile billets with a variable profile thickness in cross section, for example, tread blanks for car tires. In particular, it is intended to control the thickness of the tread blanks during their manufacture on worm machines.

The prior art device

A device is known in which the design of the head of the syringe machine for releasing blanks of protectors according to Patent RU 2045406 comprises a body mounted at the outlet of the syringe machine with a profiled internal cavity having a variable cross section from round in the cavity entrance zone to a slit-like, similar to the tread profile, in the exit zone heads. The head is equipped with a set of plates mounted on the housing, perpendicular to its longitudinal axis in the zone of exit from the head, and inclined holes are made in the plates, the edges of which are joined along the contacting surfaces of adjacent plates. In this case, the profiling section of the hole in the outer plate is made with a decrease in its length along the generatrix of the hole in sections along the width of the plate and with a decrease in its height.

In this device, due to the unequal thickness of the tread billet being produced along its width, determined by the shape of the outlet, proportional changes in thickness occur with varying degrees of severity associated with different levels of elastic recovery of the extrudate after leaving the worm machine.

The closest to the proposed technical essence and the achieved result is a device for extruding a flat-slit head with an adjustable profile of the forming channel described in Patent RU 2251485, comprising a housing with a forming channel made in it, in which pivotally mounted longitudinal plates with devices for adjusting their position are mounted. The control device includes a spring, a rod and a bolt that allows you to change the compression ratio of the spring, the spring abuts against the bolt at one end and the rod shoulder at the other. At the same time, an emphasis is fixed on the reverse side of the rod, which contacts the forming plate through a clip of rollers inserted into the slots on the outside of the forming plate. The inner part of the forming channel is covered with an elastic heat-resistant material.

A significant drawback of the selected prototype is that its flat-slot design does not imply the possibility of extrusion of products from viscoelastic materials, which are rubber compounds for the manufacture of pneumatic tires, with a variable thickness along the width of the tread blanks (and, accordingly, the section height of the forming hole).

An object of the invention is to increase the dimensional quality indicators, namely the dimensional accuracy of the cross-sectional profile of the tread blanks at control points and their compliance with the design and technological requirements for each type size and model of manufactured tires made of viscoelastic materials with a high degree of elastic recovery due to redistribution of rubber pressure mixtures in the field of deformation, directional changes in the velocity field in the stream of the processed material n and at the entrance to the forming hole of the profiling strap, and consequently, the directional change in the amount of elastic recovery of the rubber compound after leaving the forming hole.

Disclosure of invention

The technical task is achieved by the fact that in the body of the cassette in which the profiling bar is located, immediately before entering the forming hole of the profiling bar, adjusting pins are installed, the axes of which lie at the intersections of the plane perpendicular to the axis of rotation of the screw, with planes parallel to the plane of symmetry of the forming hole and passing through the control points lying in its output section. The pins are mounted with the possibility of rotation around their axes and reciprocating movement in directions perpendicular to the lower plane of the flow of the extrudable material. This allows them to be introduced into the extrudate stream at the inlet to the forming hole of the profiling bar in order to redistribute the speeds and pressures of the extrudate in the zone of control points. As a result of these effects, the thickness of the tread blanks at control points can be directed to decrease or increase due to a further change in the elastic recovery of rubber compounds after leaving the worm machine.

The solution to the technical problem is possible due to the presence of the following distinctive features:

- adjustable pins are installed immediately before entering the forming hole of the profiling bar;

- control pins are installed across the width of the extrudable part in planes passing through its control points, which allows you to act on the flow independently and simultaneously at each of the sections;

- the device has a modular design and consists of several control pins that are mounted with the possibility of rotational and reciprocating motion, which allows locally acting on the flow of moving material with varying degrees of change in its velocity and pressure fields;

- the adjusting pins are able to progressively move to a position where they practically do not represent hydraulic resistance and the effect on the flow of the extrudate ceases;

- the presence of a simple control mechanism, made in the form of bolts, allows you to quickly and accurately change the position of the pins in the extrudate stream;

- the possibility of operational effects on the position of the pins allows you to make them directly during the process, which reduces the setup time of the profiling equipment of the worm machine and the consumption of materials.

Additional distinguishing features are:

- the number and diameters of the adjusting pins are determined by the geometric dimensions and complexity of the profile of the workpiece, the number of control points and the requirements for the accuracy of its manufacture;

- the dimensions of the pins, the maximum value of their translational movement, as well as the dimensions and geometry of the working part of the pins in contact with the processed material, may vary depending on the required effects on a particular section of the tread billet profile.

Brief Description of the Drawings

The invention is illustrated by the following drawings:

FIG. 1 - General view of the head of the worm machine with a device including adjusting pins mounted on a thread in the cassette in front of the profiling bar;

FIG. 2 - The location of the pins for adjusting the thickness of the tread billet in the context of the cartridge in the planes passing through the control points of the profiling strap.

In FIG. 1 shows a general view of the head 1 of the worm machine with the cassette 2 installed in it and the profiling bar 3 fixed by clamping devices 4. In the cassette 2 body, immediately before the entrance to the forming hole of the profiling bar 3, adjusting pins 5. The pins are mounted on the thread with the possibility of rotational reciprocating motion along axes located in a plane perpendicular to the axis of rotation of the screw of the worm machine and to the base of the forming hole of the profiling bar.

In FIG. 2, in the context of the cartridge 2, the location of the pins 5 is shown, the axes of which lie at the intersection of the plane perpendicular to the axis of rotation of the screw with the planes parallel to the plane of symmetry of the forming hole 7 and passing through the control points 8 lying in its output section. Sizes a, b, d - distances from the base 6 of the forming hole 7 to the control points 8 (A, B, C, D, E, F, G and H)

Best Mode for Carrying Out the Invention

The location of the pins is determined by the design of the forming tooling. For a worm machine, in which it consists of a forming head, cassette and strap, the pins are proposed to be placed in the cassette, immediately before entering the forming hole of the profiling strap.

The proposed device for adjusting the thickness of the tread blanks of automobile tires during their manufacture on worm machines is shown in FIG. 1. The device, including the pins 5, is mounted in a cassette 2, mounted in the head 1 of the worm machine together with the strap 3 clamping devices 4.

The principle of operation of the proposed device is as follows.

When the product is released, the worm machine operator measures the geometric dimensions of the tread blank at the control points. In case of deviations of one or several sizes, they are directedly changed by screwing or unscrewing the corresponding pins.

Points controlled by the operator of the sizes indicated as: A, B, ... N (Fig. 2). In the case, for example, if the operator revealed insufficient thickness of the workpiece at points B and G and excess thickness at points D and E, it is necessary to unscrew the pins B and G and tighten the pins D and E a few turns. When the pin is twisted, its cylindrical part extends from the cartridge body into the rubber mixture flow, which will cause its partial deceleration, which, in turn, will lead to a corresponding distortion of the rubber mixture flow velocity profile and a decrease in the elastic recovery size of the workpiece profile at the exit of the worm machine. As a result, there will be a local reduction in the thickness of the workpiece. When the pins are twisted, the opposite effect will occur, which will cause an increase in the thickness of the material in the corresponding section.

Achievable technical result

The technical result of the invention is to expand the functionality of the worm machine, allowing directly during the extrusion process to perform operational control of the thickness of the tread blanks in order to increase the accuracy of their sizes at control points in accordance with the requirements of the technological regulations without stopping the equipment of the tread unit.

To achieve a technical result in a device for adjusting the thickness of the tread blanks of automobile tires during their manufacture on worm machines, including a forming head, a cassette and a profiling bar installed and fixed together with a cassette in the head of the machine, in the cassette body immediately before entering the profiling hole adjusting pins are installed, the axes of which are located at the intersections of the plane perpendicular to the axis of rotation of the screw, with planes parallel to and the plane of symmetry of the forming hole and passing through the control points lying in its output section.

The use of adjusting pins installed with the possibility of reciprocating movement immediately before entering the forming hole of the profiling bar allows the tread assembly operator to promptly carry out the corresponding operational impacts on the size formation process of the tread blanks profile during their manufacture without removing the forming tool from the machine head.

Claims (1)

A device for adjusting the thickness of the tread blanks of automobile tires during their manufacture on worm machines, including a forming head, a cassette and a profiling bar installed and secured together with a cassette in the head of the machine, characterized in that in the cassette body, immediately before the entrance to the forming hole of the profiling slats mounted with the possibility of rotational and reciprocating movement of the adjusting pins, the axes of which are located at the intersections of the plane perpendicular the axis of rotation of the screw, with planes parallel to the plane of symmetry of the forming hole and passing through the control points lying in its output section.

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