SU1729769A1 - Way of milling worn-out tyres - Google Patents

Abstract

Usage: grinding worn tires with high efficiency. The essence of the invention: as an abrasive material, abrasive grains are used, which are fed under pressure using a screw feeder. Abrasive grains act on the tire and crush it, while the grains are constantly mixed and the cutting edges are updated. 1 hp ff, 3 ill.

Description

The invention relates to the processing of worn tires and can be used in the manufacture of rubber powder.

A known method of grinding rubber products is that the product is subjected to elastic deformation followed by grinding with a porous abrasive wheel when water is supplied, and water is fed into the zone of contact of the circle with the product through the pores of the circle under a pressure of 2-4 kgf / cm2.

The disadvantage of this method is the low grinding efficiency due to the low reliability of work due to the high porosity of the abrasive wheel and the supply of water under pressure, and lowering the circle porosity inevitably leads to its sticking with rubber.

Closest to the present invention is a method of grinding worn covers, in which the periphery of a rotating tire is subjected to an abrasive material, while cooling fluid is supplied to the treatment area.

The disadvantage of this method is the low grinding efficiency, due to the sticking of the grinding wheel with rubber.

The purpose of the invention is to increase the grinding efficiency.

The goal is achieved in that according to the proposed method, the periphery of the rotating tire is affected by an abrasive material, while cooling fluid is supplied to the treatment area, abrasive grains are used as the abrasive material, which are fed under pressure using a screw feeder.

When this tire is compressed in the transverse direction.

FIG. 1 shows the device, a general view; in fig. 2 is a view A of FIG. 1 (tire installed in a jig not shown); in fig. 3 - a pipe with a loading funnel.

WITH/

with

VI

and

IS

ChE

The method is carried out as follows.

On the housing 1, a clamp 4 is attached to the clamping device 2 associated with the rotational drive 3, and compressed. The treatment zone through the valve 5 serves coolant, and through the pipe 6, which is made with a circular cross-section, smoothly convertible to rectangular, and connected to the actuator 7 through the feed funnel 8 by means of a screw 9 of a conical shape, abrasive grains are fed. The finished grinding product enters the device 10 to collect it.

Example. Worn tire 4 is fed to the clamping device 2, where it is compressed in the transverse direction. At the same time, significant internal stresses occur in tire 4. In the loading core 8, abrasive grains with a size of 3-5 mm are loaded. Silicon carbide is used as an abrasive material. Then the tire 4 is rotated by a rotation drive 3. Pipe 6 provides abrasive grains to the periphery of tire 4 with the aid of a screw feeder 9 at a speed of 10–30 mm / min. The supply of abrasive material is ensured evenly due to the same section along the entire length of the pipe 6. The section of the pipe 6 at the exit corresponds to the width of the crushed tire 4, which ensures its grinding across the entire width. So that the abrasive grains supplied to the periphery of the tire 4 do not wake up between the cover 4 and the pipe b, in the process of grinding the tire 4 the pipe 6 as the diameter of the tire decreases receives movement from the drive 7 to the tire 4 (in Fig. 1) caliper drive 7 feed). By means of a crane 5, a cooling liquid is supplied to the treatment area, which also contributes to the removal of crumb rubber and worn abrasive grains. Cooling also eliminates the possibility of overheating and changes in the physicomechanical properties of rubber. The distance between the tube 6 and the tire 4 is in the range of 0.5-1.5 mm. Abrasive grains are used in the size of 3-5 mm, since their reduction is less than 3 mm.

leads to an increase in the possibility of their penetration between the pipe 6 and the tire 4, and an increase in their size is undesirable due to the effect of cutting forces on them. AT

during processing of the tire, 4 abrasive grains are constantly mixed under the action of cutting forces, due to which there is a constant updating of the cutting edges of the abrasive grains and, despite

the abrasive is polluted with rubber crumb, the cutting ability of abrasive grains is not lost. When worn, the abrasive grains spill between pipe 6 and tire 4. The pressing of the abrasive grains to the tire 4

performed by a screw feeder 9. When slipping between the pipe 6 and the tire 4 of unworn abrasive grains, reduce the distance between the pipe 6 and the tire 4 or reduce the speed

rotation of the screw 9. The tire 4 is crushed into powder, which is removed using the tool 10 for collecting the finished product mounted on the housing 1. In the finished product the rubber

the powder from the worn abrasive grains is carried out in a container with water, where the abrasive particles settle to the bottom and the rubber powder floats on the surface. Compressing the tire 4 in the transverse direction before processing reduces the energy consumption for grinding.

When using the proposed method, the grinding efficiency is improved, the productivity increases

no abrasive sticking of the material with rubber.

Claims (2)

1. A method of shredding worn coatings, in which the periphery of a rotating tire is subjected to an abrasive material, while cooling fluid is supplied to the treatment area, characterized in that increase grinding efficiency; abrasive grains are used as an abrasive material, which are fed under pressure using a screw feeder. 2. A method according to claim 1, characterized in that the tire is compressed during the grinding process in the transverse direction, # /. /