KR20240044221A - Sidewall crimping device - Google Patents

Abstract

The present invention relates to a side wall pressing device that can prevent the free assembly from being separated from the tire building drum by compressing the side wall of the free assembly that is attached and rotated to the tire building drum through a pressing unit and a moving unit.
Specifically, according to one embodiment of the present invention, a pressing unit for pressing the side wall of the free assembly attached to the tire building drum to the tire building drum; and a moving unit that moves the compression unit so that the compression unit moves along the rotation direction of the tire building drum. A side wall compression device including a.

Description

Sidewall Crimping Device {SIDEWALL CRIMPING DEVICE}

The present invention relates to a side wall compression device, and more specifically, to prevent the pre-assembly from being separated from the tire building drum by compressing the side wall of the pre-assembly that is attached and rotated to the tire building drum through a compression unit and a moving unit. This is an invention for a side wall compression device that can do this.

Tires are made through a refining process that mixes raw materials, a semi-finished product process that produces semi-finished products required for tire manufacturing in advance, a molding process that attaches the produced semi-finished products to a molding drum to produce a green tire, and a finished tire by applying a certain temperature and pressure to the green tire. It is completed through the vulcanization process.

Among the tire manufacturing processes described above, the molding process involves attaching a pre-assembly (in which the inner liner and side wall are pre-attached) to the molding drum, then wrapping and stitching carcass plies in order, and attaching bead portions to both ends of these. . Afterwards, the pre-assembly and carcass ply are wrapped around the bead and turned outward to form the green tire.

When attaching the pre-assembly to the forming drum in the above-described forming process, both the mechanical-type forming drum and the Breda-type forming drum use sponge rollers to simultaneously attach and compress the pre-assembly to ensure smooth attachment of the pre-assembly. However, with the recent development of premium product standards, the thickness of the side wall has become thicker, and when attaching the pre-assembly to the forming drum, the pre-assembly is frequently separated from the forming drum due to the load of the side wall.

In the case of a mechanical forming drum made of steel, a steel bar is used to maintain the adhesion of the free assembly, but in the case of a Breda type forming drum, this cannot be used because the material is different from the steel bar. As shown in Figure 1, the adhesion of the pre-assembly is maintained by applying a molding adhesive to the side wall. However, as shown in Figure 2, the molding adhesive applied to the side wall solidifies and becomes foreign matter as the long-term curing process progresses and adheres to the curing mold, which causes an appearance defect similar to that of the side wall bear in the finished product after the curing process. There was a problem.

Republic of Korea Patent Publication No. 1534585

One embodiment of the present invention was invented with the above background in mind. By compressing the side wall of the pre-assembly that is attached and rotated to the tire building drum through a pressing unit and a moving unit, the pre-assembly is separated from the tire building drum. We would like to provide a side wall compression device that can prevent this.

According to one aspect of the present invention, a pressing unit for pressing the side wall of the free assembly attached to the tire building drum to the tire building drum; and a moving unit that moves the compression unit so that the compression unit moves along the rotation direction of the tire building drum. A side wall compression device including a.

Here, the pressing unit includes a pressing roller formed to press the side wall of the free assembly; and a first actuator connected to the compression roller to advance or reverse the compression roller toward the tire building drum.

Additionally, the moving unit may include a guide member extending with a curvature corresponding to the curvature of the tire building drum; A moving block coupled to the compression unit and installed on the guide member to enable the compression unit to move along the guide member; and a second actuator that moves the compression unit along a direction in which the guide member extends.

At this time, one side of the guide member may face a side of the tire building drum, and the other side of the guide member may face a lower part of the tire building drum.

In addition, the pressing unit compresses the pre-assembly when the end of the free assembly reaches the side of the tire building drum, and in a state where the pressing unit compresses the pre-assembly, the pressing unit forms the tire. The moving block can be moved to move along the circumference of the drum.

In addition, the pressing unit includes a pressing roller configured to press the side wall of the free assembly, and the pressing roller is configured to allow the free assembly to press the tire building drum after reaching the lower part of the tire building drum. The pre-assembly can be pressed against the tire building drum by rotating on the pre-assembly until it rotates to surround the tire building drum.

One embodiment of the present invention has the effect of preventing the free assembly from being separated from the tire building drum by compressing the side wall of the pre-assembly that is attached and rotated to the tire building drum through a pressing unit and a moving unit.

Accordingly, there is no need to apply molding adhesive to prevent the pre-assembly from being separated from the tire molding drum, which has the effect of fundamentally preventing appearance defects in the finished tire product caused by the molding adhesive.

Figure 1 is a diagram showing the molding adhesive used in a Breda type molding drum.
Figure 2 is a diagram showing the appearance defects of the finished tire product caused by the molding adhesive.
Figure 3 is a plan view of the side wall pressing device according to the present invention.
Figure 4 is a side view of the side wall pressing device according to the present invention.
Figure 5 is a view showing the side wall pressing device according to the present invention disposed near the tire building drum.
6A to 6H are diagrams showing the operating state of the side wall compression device according to the present invention.

Hereinafter, specific embodiments for implementing the technical idea of the present invention will be described in detail with reference to the drawings.

In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

In addition, when a component is mentioned as being 'connected', 'supported', 'connected', 'supplied', 'delivered', or 'contacted' with another component, it is directly connected, supported, connected, or connected to that other component. It may be supplied, delivered, or contacted, but it should be understood that other components may exist in the middle.

The terms used in this specification are merely used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

In addition, it should be noted in advance that expressions such as upper, lower, and side in this specification are explained based on the drawings, and may be expressed differently if the direction of the object in question changes. For the same reason, in the accompanying drawings, some components are exaggerated, omitted, or schematically shown, and the size of each component does not entirely reflect the actual size.

Additionally, terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by these terms. These terms are used only to distinguish one component from another.

As used in the specification, the meaning of "comprising" is to specify a specific characteristic, area, integer, step, operation, element and/or component, and to specify another specific property, area, integer, step, operation, element, component and/or group. It does not exclude the existence or addition of .

Meanwhile, the 'radial direction' described below refers to a direction that is perpendicular to the rotation axis direction and extends radially, and the 'axial direction' is perpendicular to the radial direction and parallel to the rotation axis of the tire. It means one direction, and the 'circumferential direction' is perpendicular to the radial direction and means the tangential direction around the tire circle. Meanwhile, unless otherwise specified, the directions include both positive and negative directions.

Hereinafter, a specific configuration of a side wall compression device according to an embodiment of the present invention will be described with reference to the drawings.

The side wall pressing device according to the present invention, as shown in FIGS. 3 and 4, compresses the side wall 32 of the free assembly 30 attached to the tire building drum 10 to the tire building drum 10. It includes a compression unit 100 and a moving unit 200 that moves the compression unit 100 so that the compression unit 100 moves along the rotational direction of the tire building drum 10.

First, the compression unit 100 is connected to a compression roller 110 formed to compress the side wall 32 of the free assembly 30 and the compression roller 110 to apply the compression roller 110 to the tire building drum 10. ) includes a first actuator 120 that moves forward or backward toward the side.

The compression roller 110 is provided as a cylindrical roller formed to have a predetermined diameter and rotatable about a rotation axis installed at its center. At this time, the compression roller 110 may be provided as a profile roller that is easy to compress, and is formed to have a length of about 200 mm, so that it is easy to compress the side walls of most tires with sizes ranging from 16 inches to 30 inches or more, depending on the tire size. Accordingly, there is no hassle of replacing the compression roller 110. In this embodiment, the pressing roller 110 is described as a profile roller of about 200 mm, but it is not necessarily limited to this, and any configuration capable of pressing the side wall 32 of the free assembly 30 to the tire building drum 10 Includes.

The first actuator 120 is configured to move the compression roller 110 forward or backward, and may be provided as a linear motor or hydraulic cylinder. The drive shaft of the first actuator 120 is connected to the compression roller 110, and the operation of the first actuator 120 causes the compression roller 110 to move forward or backward toward the tire building drum 10. When the pressure roller 110 advances by the first actuator 120 and compresses the side wall 32 of the free assembly 30, the first actuator 120 moves the pressure roller 110 to the side with a pressure of about 4 bar. It may be operated to compress the wall 32. In this embodiment, the first actuator 120 is described as being a linear motor or a hydraulic cylinder, but it is not necessarily limited thereto and includes all components for moving the compression roller 110 forward or backward.

Meanwhile, the moving unit 200 is coupled to a guide member 210 extending with a curvature corresponding to the curvature of the tire building drum 10 and the compression unit 100, so that the compression unit 100 moves along the guide member 210. It includes a moving block 220 installed on the guide member 210 so as to be movable, and a second actuator 230 that moves the compression unit 100 along the direction in which the guide member 210 extends.

The guide member 210 is an arc-shaped member extending with a curvature corresponding to the outer circumferential curvature of the tire building drum 10, and extends from the side (A in FIG. 6A) of the tire building drum 10 to the lower part (in FIG. 6A). B) is formed to extend along the outer circumference of the tire building drum 10. That is, the guide member 210 has a radius larger than that of the tire building drum 10 and is formed in a fan-shaped arc shape with a central angle of 90°. In other words, one side of the guide member 210 faces the side of the tire building drum 10, and the other side of the guide member 210 faces the lower part of the tire building drum 10. The guide member 210 formed as described above is disposed at a predetermined distance from the tire building drum 10. At this time, the guide member 210 is disposed at the lower right side of the tire building drum 10 in FIG. 6A, which means that the compression roller 110 of the compression unit 100 moving along the guide member 210 is positioned on the tire building drum ( This is to start compressing the side wall 32 of the free assembly 30 at portion A of FIG. 6A of 10) and press it to portion B of FIG. 6A of the tire building drum 10. Referring to FIG. 6A, the pre-assembly 30 supplied to the tire building drum 10 through the conveyor 40 is supplied through the upper side of the tire building drum 10, and is supplied to the tire building drum 10. Since 30 is rotated while attached, the centrifugal force applied to the free assembly 30 at A in FIG. 6A is maximum. In addition, since the gravity applied to the free assembly 30 is maximum at B in FIG. 6A, separation of the free assembly 30 occurs most frequently in the section from A in FIG. 6A to B in FIG. 6A. Therefore, in order to prevent the free assembly 30 from being separated, the free assembly 30 must be compressed in the section from A in FIG. 6A to B in FIG. 6A, so the guide member 210 is aligned with the tire building drum 10 in FIG. 6A. It is placed in the upper right lower part. The above-mentioned guide members 210 are provided in pairs and arranged to be spaced apart from each other so that the pressing unit 100 is installed between them. In addition, a rail is formed inside each guide member 210 to be coupled to the moving block 220 along the longitudinal direction of the guide member 210.

The moving block 220 is provided as a square-shaped plate with a predetermined thickness and is installed on both sides of the first actuator 120, respectively. At this time, a rail block is formed in each moving block 220 to be coupled to the rail formed on the guide member 210, so that the moving block 220 moves along the guide member 210 by combining the rail and the rail block. It is installed as much as possible. A plurality of bearings 221 are formed in each movable block 220, and a guide member 210 is installed to fit between the bearings 221 to facilitate smooth movement of the movable block 220.

The second actuator 230 is configured to move the compression unit 100 along the direction in which the guide member 210 extends, and may be provided as a linear motor or hydraulic cylinder. The drive shaft of the second actuator 230 is connected to the first actuator 120, and the compression unit 100 including the first actuator 120 is connected to the guide member 210 by the operation of the second actuator 230. moves along. In this embodiment, the second actuator 230 is described as being a linear motor or a hydraulic cylinder, but it is not necessarily limited thereto, and all configurations for moving the compression unit 100 along the direction in which the guide member 210 extends are included. Includes.

In addition, the present invention may further include a transfer motor 300 installed on the compression unit 100 or the moving unit 200 so that the compression unit 100 can move along the axial direction of the tire building drum 10. .

The transfer motor 300 may be a general linear motor and may be connected to and installed at the lower part of the guide member 210. The drive shaft of the transfer motor 300 is disposed parallel to the rotation axis of the tire building drum 100, and the guide member 210 is transferred in the axial direction of the tire building drum 10 by driving the transfer motor 300. . Accordingly, the compression unit 100 installed and connected to the guide member 210 can also be transported in the axial direction of the tire building drum 10. In this embodiment, the transport motor 300 is described as being connected to the guide member 210, but it is not necessarily limited to this, and all the compression units 100 that can move the compression unit 100 in the axial direction of the tire building drum 10 can be used. Can be installed in any location.

Below, with reference to FIGS. 5 to 6H, the operation of the side wall pressing device having the above-described configuration will be described.

Figure 5 is a diagram showing the side wall pressing device according to the present invention disposed near the tire building drum 10. Since the side walls 32 on both sides of the pre-assembly 30 must be pressed, the side wall pressing device is used. are provided in pairs and arranged to be spaced apart from each other. At this time, the transfer motor 300 is operated to transport each side wall pressing device along the axial direction of the tire building drum 10. Accordingly, each side wall pressing device is operated on both side walls 32 of the pre-assembly 30. ) and is placed on the same line.

Thereafter, as shown in FIG. 6A, when the conveyor 40 is operated and the pre-assembly 30 is supplied to the tire building drum 10, the tire building drum 10 rotates so that the pre-assembly 30 is formed into a tire. It moves along the drum (10).

When the pre-assembly 30 begins to move along the tire building drum 10 as described above, as shown in FIG. 6B, the first actuator 120 is activated to move the compression roller 110 to the tire building drum 10. ) advance to the side.

The compression roller 110 advanced by the operation of the first actuator 120 contacts the side wall 32 of the free assembly 30 moving along the tire building drum 10 to compress the side wall 32. Let's begin. (See FIG. 6C) At this time, the first actuator may be operated so that the compression roller 110 compresses the side wall 32 of the free assembly 300 with a pressure of about 4 bar.

Afterwards, the second actuator 230 is operated to advance the first actuator 120, and the pressing unit 100 including the first actuator 120 moves the moving block 220 coupled to the first actuator 120. ) is moved along the guide member 210. (see Figure 6d)

As shown in Figure 6e, the compression unit 100 moving along the guide member 210 moves along the guide member 210 from part A in Figure 6e to part B in Figure 6e. The side wall 32 of the pre-assembly 30 is pressed against the tire building drum 10. At this time, after the compression roller 110 reaches the lower part (B of 6e) of the tire building drum 10, the pre-assembly 30 rotates to surround the tire building drum 10. ) and presses the free assembly 30 to the tire building drum 10,

When the pre-assembly 30 is formed into a circle without leaving the tire building drum 10 by compression by the compression unit 100, the conveyor 40 stops operating and the pre-assembly 30 is no longer transferred to the tire building drum. (10) is not supplied. (see Figure 6f)

Thereafter, when the rotation of the tire building drum 10 stops, the pressure roller 110 moves backward by the operation of the first actuator 120, and accordingly, the pressure roller 110, the free assembly 30, and the side wall 32 ) contact is released. (see Figure 6g)

As described above, when the contact between the pressing roller 110 and the side wall 32 of the free assembly 30 is released, the second actuator 230 is activated to move the pressing unit 100 backwards to its original position. (see Figure 6h)

The side wall pressing device according to the present invention, which is configured and operated as described above, is attached to the tire building drum 10 through the pressing unit 100 and the moving unit 200 and rotates the side wall of the free assembly 30 ( By compressing 32), it has the effect of preventing the free assembly 30 from leaving the tire building drum 10, and thus prevents the free assembly 30 from leaving the tire building drum 10. Since there is no need to apply molding adhesive, there is an excellent effect of fundamentally preventing defects in the appearance of finished tire products caused by molding adhesive.

Although embodiments of the present invention have been described above as specific embodiments, this is merely an example, and the present invention is not limited thereto, and should be construed as having the widest scope following the technical idea disclosed in this specification. A person skilled in the art may implement a pattern of a shape not specified by combining/substituting the disclosed embodiments, but this also does not depart from the scope of the present invention. In addition, a person skilled in the art can easily change or modify the embodiments disclosed based on the present specification, and it is clear that such changes or modifications also fall within the scope of the present invention.

10: Tire building drum 20: Sponge roller
30: Free assembly 31: Inner liner
32: side wall 40: conveyor
100: Compression unit 110: Compression roller
120: first actuator 200: movement unit
210: guide member 220: moving block
221: bearing 230: second actuator
300: transfer motor

Claims (6)

a compression unit that presses the side wall of the free assembly attached to the tire building drum to the tire building drum; and
A side wall compression device comprising: a moving unit that moves the compression unit so that the compression unit moves along the rotation direction of the tire building drum. According to claim 1,
The pressing unit is,
a compression roller formed to compress the side wall of the free assembly; and
A first actuator connected to the compression roller to advance or retract the compression roller toward the tire building drum. According to claim 1,
The mobile unit is,
a guide member extending with a curvature corresponding to the curvature of the tire building drum;
A moving block coupled to the compression unit and installed on the guide member to enable the compression unit to move along the guide member; and
A second actuator that moves the compression unit along a direction in which the guide member extends. A side wall compression device comprising a. According to claim 3,
One side of the guide member faces a side of the tire building drum, and the other side of the guide member faces a lower part of the tire building drum. According to claim 4,
the pressing unit compresses the pre-assembly when an end of the pre-assembly reaches the side of the tire building drum,
A side wall pressing device that moves the moving block so that the pressing unit moves along the circumference of the tire building drum while the pressing unit is pressing the pre-assembly. According to claim 4,
The pressing unit includes a pressing roller configured to press the side wall of the free assembly,
The compression roller, after reaching the lower part of the tire building drum, rotates on the free assembly until the free assembly rotates to surround the tire building drum and presses the free assembly to the tire building drum. Wall pressing device.

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