Method and installation for inclusion of solid granules in the tyre tread

 

(57) Abstract:

The invention relates to a method and installation for inclusion of solid granules in the tyre tread, and in some rubber bands and a workpiece protector. Rubber blank is extruded in an extruder with obtaining protective strips of the required forms, which are under the control of the continuously rolled several layers of a certain thickness on the preprocessed bus or other material (subject). Then they give emphasis with the formation of the corresponding figure and are vulcanized. A distinctive feature of the invention is that the solid granules are distributed (applied) in accordance with a given configuration, at least part of the surface of the extruded rubber tread strip before rolling the next layer on the pretreated bus using for a specified distribution of granules device so that the granules after profiling and vulcanization were included in the fitting, i.e., a figure, wearing the tread surface of the tire. The result is improved stability of the vehicle on slippery roads. 3 S. and 8 C.p. f-crystals, 8 ill.

Izobreteniya tape and the workpiece protector, through which the rubber blank is extruded with obtaining protective strips of the required form, which several layers of a certain thickness is continuously under control, rolled around pretreated tires or other material (subject), and then give emphasis with the formation of the corresponding figure and are vulcanized.

Bus vehicles are, generally speaking, from fiber reinforced frame (provided with wire or rope), which forms the inner layer of the tire, and an outer wear layer, which is made of vulcanized rubber or similar material, and which profiles to obtain the desired picture above by reinforced tire carcass.

Tires are manufactured in accordance with the above-described steps, and the restoration of their protectors is also a known process. When the shape of the outer surface (the protector) is worn so that it ceases to perform its function, the rest of this outer surface is polished and specified on the tire carcass put a new protector. One method of retreading is continuous coating frame Aniem new drawing and vulcanizer.

The role of the outer layer of the tire is the formation of stable and wear-resistant surface with respect to the road surface on which the vehicle is moving. There are many ways of increasing the wear resistance of the tire and reduce slipping of vehicles on slippery surfaces such as ice or snow. Special mention should be made of thorns, closed up in a bus after their manufacture in a known manner, and anti-skid chains.

The premise of the invention.

In recent years and decades have been proposed ideas related to the inclusion and/or consolidation of different types of materials in or on the wearing surface of the tire.

Known methods include solid granules in the tyre tread to increase its stability on slippery surfaces, especially on snow and ice. In U.S. patent N 2672910, issued in 1948, described the manufacture of tires, where the crude rubber used for its production, mixed with coated carbide granules. Superior grip with rubber granules is achieved by coating.

In addition, they developed methods of recovery of the tyre tread. To prepare worn tires to roll on nm Germany DE 4025459 A1, referring generally to the recovery of tires used tires, a new layer of rubber wrapped around the bar, after which he was profiled with obtaining the desired figure.

In addition, in European patent applications EP 0454025 A1 and EP 442155 A1 describes methods for the production of tyres and/or repair of tires, in accordance with which the raw rubber before extrusion and knurling on the preprocessed bus, was mixed into coated carbide granules.

In the above-mentioned patents describe methods and installations for the manufacture of treads and tires. They describe the inclusion of solid granules in the tread of the tire to increase the wear resistance of the tire and reduce slipping of the vehicle on ice or snow.

None of the mentioned methods or setting to enable solid granules have not received wide acceptance because of their deficiencies, which occur when they are used in the production process. The drawback of these methods lies in the cost of production in the implementation of the inclusion of solid granules in the rubber due to the significant depreciation of the equipment.

If the solid granules are mixed with a whole lot of raw material, that is, the I solid granules in the outer wear surface of the tire, what should also be considered as a drawback.

Another disadvantage is the insufficient adhesion between the reinforced fiber frame and provided with beads protector, because the granules show a tendency to weaken the adhesion between the carcass and the tread, i.e. the outer wear surface of the tire. In addition, it is believed that the granules mixed into the whole mass of rubber material, reduce the elasticity of the tire carcass.

Disclosure of the invention.

The aim of the invention is the provision of a method and installation, which, however, is simple in implementation and manufacture, efficient in operation, and which also allow you to control the inclusion of solid granules and their location in the outer wearing surface of the tire. One of the main advantages of the method on which the bid is submitted, is that it does not allow for additional work on the restoration of the tyre tread.

The manufacture of tyres and treads with an admixture of solid granules provides the following benefits:

- increased stability of the vehicle on slippery surfaces;

- reduced wear on dorogaya the case of the use of tyres with spikes and anti-skid chain.

These characteristics are confirmed by tests conducted by the office of Sweden VTI (Swedish Public Roads Administration and the office BAST Germany (German Public Roads Administration or Bundesanstalt lur Stasserwesen).

These advantages are achieved by implementing a distinctive characteristic of the invention, which consists in placing solid granules on at least part of the surface of extruded rubber tread strip in accordance with a given configuration before rolling the next layer in a circle on the preprocessed bus using a special device so that the granules were included in shapes having the desired pattern, the tread surface of the tire after profiling and vulcanization.

Another aspect of the invention is that the solid granules are placed in accordance with a given configuration, at least part of the surface of extruded rubber tread strip, which ensures the control of a segment of the tread strip, the coated solid granules, and also distribution of granules in given areas shaped and vulcanized tires.

Another hallmark izobreteniya bands distributed from 0.01 to 0.1 gram of solid granules, where the diameter of each pellet is 1 to 3 mm, in particular 1.5 to 2.0 mm

In addition, a distinctive feature of the invention is that the solid granules are distributed in accordance with a given configuration on the surface of extruded rubber tread strip, which after its knurling on the pretreated surface of the tire casing forms the outer surface of vulcanized and shaped bus, and in that the device for applying granules have after the extruder and on extruded rubber tread strip and the front of the bus, and in that the granules are applied to the specified tread strip in front of her knurling on the bus.

A device for applying granules is unique because it consists of a hopper-type funnel, which serves before applying solid granules, and feeder (rotating, rubber coated cylinder), which delivers the required amount of granules from the hopper into the guide element, controlling their supply rubber tread strip, and a distribution device (specified by the guide element, can be adjusted to control the direction and the tion and speed of the strip, moreover, the number of granules, supplied and applied from the hopper is regulated by a slide feeder and speed of rotation of the cylinder, which ensures the location of the granules on the tread strip to the required density.

Much work has been carried out to study the characteristics of the tires made above in a new way. Very thorough tests conducted by the traffic office BAST, Germany, has convincingly shown that the wear of the road surface caused by tyres with solid granules, more wear and tear caused by winter tyres, but significantly less than the average road wear caused by the 9 types of tyres with spikes. Tests BAST showed that, if the road wear caused by tyres with spikes, to take over 100% as a reference point, the road wear caused by the mentioned tires with solid granules, is 7%, and the wear from "winter tires" - 2%.

Tests conducted by the Swedish road authority (see above) , linköping, showed that tires with solid pellets have a much greater stability (adhesion) on slippery roads than the same type of tires without solid granules. Tests also showed that tires with solid granules have, in General, better stability, i.e., the adhesion of the EIT, for example, the bends in the road and in cases where antihormone system prevents the complete locking of the wheels.

In all likelihood, many types of solid granules can be used for inclusion in the tyre tread. Tests were carried out on the use of pellets SIC (silicon carbide, i.e., "silicon carbide"), and Al2O3(aluminum oxide), which have been coated with known binders and/or adhesives.

A brief description of the drawings.

The invention is described in more detail below with reference to the attached drawings figures, where:

Fig. 1 is a side view of an installation for the recovery of the tyre tread and to enable solid granules in the tread;

Fig. 2 is a top view of the installation for the recovery of the tyre tread and to enable solid granules in the tread;

Fig. 3 - elements of a device for the application and distribution of solid pellets protectors;

Fig. 4A and 4b are fragments of the guide element, which controls the supply of solid granules rubber tread strip;

Fig. 5 - section tyres with solid granules in the extreme outer layer of the tread;

Fig. 6 is a top view of a tread pattern in accordance with Fig. 5;

Fig. 7 is a partial illustration of processtrace roll rubber tread strip (6) on the bus, and the image location of solid granules (25) between the layers of rubber tread strip.

In Fig. 1 and 2 shows a known device used for the formation of the tyre tread. In Fig.1 shows a side view of the installation, and Fig. 2 its top view. Installation can be additionally equipped with a device for mixing solid granules in the tyre tread. The unit consists of extruder (2), which produces a thin elastic rubber band (6) of rubber of the workpiece (5). In the extruder (2) of the workpiece (5) extends in a thick band (4), which is processed here and extruded through a forming head (3) of the extruder in the form of a relatively thin rubber tread strip (6). Strip (6) extending from the head (3), extends above and below the control rollers (16) and then again over and under second pair of control rollers (15) up until it ultimately will not nakataya on pretreated bus (9, 17). Part of a roll profile (15), alternatively, may be collected from a number of thin disks, similar to the pressure roller (8), which presses the rubber tread strip (6) to the bus. The tire is attached to the device, which, on the one hand, it rotates around an axis (11), and the vertical axis, thereby shifting the alignment of pre-processed tires about the rolling device (13). This provides the possibility of rolling strip (6) layers, which overlap overlap, covering the entire bus (see POS. 13), as wrapping around her. Between the extruder (2) and bus (9) the device (1) designed to enable solid granules in the tread strip and/or for applying them on the bar. The device (1) is attached to the lever (14), which comes out of the extruder (2), which supports some of the rolls (15) and pressure roller (8). Of course, this device can be placed separately. Its function is to distribute the solid granules on the tread band before knurling on the bus or at an appropriate stage before rolling the next layer of the tread band on top of the previous layer (see Fig. 7 and 8).

In Fig. 3 shows the device (1), the function of which is the inclusion of solid pellets in a rubber tread strip (6) or the application of granules on it. The device (1) consists of a hopper (20) with a funnel, which serves granules prior to their distribution and feeder (21, 22), which provides a supply of a controlled quantity of granules from the hopper bunno under the funnel (20), and who picks up the bottom of the granules leaving the funnel under the flap (21) or similar metering device. The cylinder moves the pellets prior to their fall in the control guide element (7) which is curved in the direction of the tread strip (6), and then into the distribution head (23) located on the end of the element (7), which ensures the application of solid granules on the strip (6).

In Fig. 4A and 4b shows the details of the application of granules to the tread strip (6). This band is moving in the direction of the arrow (36), while at her from the distribution head (23) of the element (7) is applied granules (25), and they come out of the head (23) at a rate that, as far as possible, accurately synchronized with the speed of the tape (6). The size (width) and the accuracy of the position of the distribution head (23) provide controlled application of granules to the area (37) of the strip (6) or over the entire band.

In Fig. 5 shows a cross-section of vulcanized and shaped with a corresponding pattern tires (35) and the location of solid granules (25) protector (27) bus. The pellets are sealed at the outer part (28) of the tread.

In Fig. 6 shows how the granules (25) are arranged on the figure is a circle layers (6', 6", 6"') on the pre-processed frame (26) of the tire. Depending on the method of continuous rolling tread strip in a circle on the bus each layer of strips partially overlap overlap the next layer.

In Fig. 8 shows the details of the rolling rubber tread strip (18), where each layer partially overlaps overlap(6', 6", 6"', 6"") layer the following, as well as the location of the deposited solid granules between the layers of the tread strip(25', 25"...).

The above invention is not limited precisely to these details of its embodiment and can be modified in many ways without deviating from its main concept.

1. The method of inclusion of solid granules in the tyre tread and in some rubber bands and protectors, in accordance with which the rubber blank is extruded with obtaining protective strips (6) of the required form, which several layers of a certain thickness rolled under control around pretreated bus (9) or other material, and which are then concerned with obtaining the appropriate picture and are vulcanized, characterized in that the solid granules (25) are distributed according to a given configuration is attorney stripes on pretreated bus (9) with the use intended for the specified distribution of the granules of the device (1) thus, to the granules (25) were included in the fitting, i.e., a figure, wearing surface (35) of the tire tread after profiling and vulcanization.

2. The method of inclusion of solid granules in the tyre tread under item 1, characterized in that the solid granules (25) are distributed according to a given configuration, at least part of the surface (37) co-extruded rubber tread strip (6), which allows you to control a segment of the tread strip, coated carbide granules, and also to control the distribution of granules in given areas wearing surface shaped and vulcanized tread.

3. The method of inclusion of solid granules in the tyre tread under item 1 or 2, characterized in that on one square centimeter of rubber tread strip, the coated solid granules, distributed between 0.01 and 0.1 g of solid granules.

4. The method of inclusion of solid granules in the tyre tread according to any one of paragraphs.1-3, characterized in that the diameter of each pellet is 1-3 mm and, in particular, 1,5-2,0 mm

5. The method of inclusion of solid granules in the tyre tread according to any one of paragraphs.1-4, characterized in that the solid granules are distributed according to the weight of the roll on the frame pretreated bus forms the outermost layer (28) formed i.e., formed with a corresponding picture, and vulcanized tread.

6. Installation to include solid granules in the tyre tread and some rubber bands and protectors, through which the rubber material (4) extruded in the extruder (2) with obtaining protective strips (6), with several layers of a certain thickness controlled rolled the pretreated bus (9) or other material, and which are then concerned with with the formation of the corresponding figure and are vulcanized, and where the tread strip is rolled on the frame, a rotatable tire, characterized in that it, in the process of manufacturing a product, the device (1) distribution of the granules are placed after the extruder (2) and over the rubber tread strip (6), extrudable from the extruder (2).

7. Installation to include solid granules in the tyre tread on p. 6, characterized in that it, in the process of manufacturing a product, the device (1) is located after the extruder (2) front tires (9) and before the rubber tread strip, rolled on the bus.

8. Installation to include solid granules in the tyre tread on any of the p. 6 or 7, characterized in that the device is decomposing the cylinder and valve 21, 22), which ensures delivery of the required number of pellets from the hopper into the guide element (7, 23) to implement the controlled application of granules to the surface of the rubber tread strip (6).

9. Installation to include solid granules in the tyre tread according to any one of paragraphs.6, 7 or 8, characterized in that the distribution unit, i.e., the guide element (7, 23), can be adjusted so that the direction and speed of applying granules to the surface of the rubber tread strips were, as far as possible, accurately aligned with the direction and speed of movement of the tread strip to provide, thereby, control the distribution of granules (25) on the tread strip (6).

10. Installation to include solid granules in the tyre tread according to any one of paragraphs. 6-9, characterized in that the rotating cylinder (22) has a surface covered with rubber, to ensure the supply and distribution of pellets, coming at it from the funnel (20) under the flap (21).

11. Tires with solid granules produced by the method and installation according to any one of paragraphs.1-10.

 

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