Light truck inner tube seamless fan-shaped block capsule forming drum structure

Abstract

The utility model provides a light truck inner tube seamless fan-shaped block capsule forming drum structure which comprises a capsule forming drum provided with a seamless fan-shaped block, the capsule forming drum is of a groove-shaped structure, the groove-shaped structure is composed of four faces, a first side slope is connected with a groove bottom plane, the groove bottom plane is connected with a groove bottom slope, and the groove bottom slope is connected with a second side slope. The depth of the groove bottom plane relative to the top face of the left side of the fan-shaped block is 12 cm, and the depth of the groove bottom plane relative to the top face of the right side of the fan-shaped block is 6 cm. The depth of the groove bottom plane relative to the top face of the fan-shaped block is increased, the groove face of the deep groove is designed into four faces from three faces, a part of the original bottom face is reserved, a part of the bottom face is arranged to be a groove bottom slope, the inclination angle of the first side slope is adjusted to be 25 degrees from 30 degrees, and the inclination angle of the groove bottom slope is adjusted to be 7 degrees to 8 degrees from 6 degrees to 7 degrees. The phenomenon of edge warping of the inner seam allowance of the tire blank does not occur in the actual production of the fan-shaped block.

Description

Technical Field

[0001] The utility model belongs to the field of tire manufacturing, and in particular relates to a light truck inner tube seamless sector-shaped block capsule forming drum structure. Background Art

[0002] At present, the 16-inch light truck specifications are mainly produced on the LTR2-1 model of Beijing Hengchi Company. The bottom of the fan-shaped block is mostly flat without angles, and the surface of the capsule in contact with it is also flat. The angle difference with the tire bead mold contour is large, and the finished tire produced by the light truck forming machine has a bead edge defect. From the analysis of the product bead mold contour design, such as Figure 2 As shown in the figure, the tire bead has a slight angle a2, while the tire mouth produced has no angle, so it is not easy to install the pot during vulcanization production, resulting in defects in the finished product. Comparing the tire bead mouth shapes produced by different models, the tire mouth outer shapes of the tires produced by the two-drum light truck forming machine and the three-drum light truck forming machine are different. The tires produced by the three-drum forming machine are easy to install the pot, and the finished tires do not have the defects of the bead coming out of the edge. Therefore, after comparative analysis, the existing 16-inch fan-shaped block design of light trucks is unreasonable.

[0003] The Chinese utility model patent with application number 202121779973.1 provides a tire forming drum support block for a series of ordinary cross-section radial tires for light trucks. The drum support block forms a deep groove, which is a trapezoidal groove. The trapezoidal groove includes a left slope, a bottom surface and a right slope; the left slope, the bottom surface and the right slope are connected in sequence; a bending portion is formed at the intersection of the bottom surface and the right slope, and the bending portion is designed with a chamfered corner; the bottom surface is inclined from left to right. The trapezoidal groove of the utility model is composed of three surfaces, and the depth of the bottom surface is reduced. The depth of the bottom surface relative to the top surface of the drum support block on the left and right sides of the deep groove is 5cm and 8cm respectively. The bottom surface is shallow, and there are problems with the coordination of the three groove surfaces and the groove surface angles. After the fan-shaped block is raised, the squeezing force on the inner mouth of the tire embryo is not enough, which easily leads to the problem of serious warping of the inner mouth of the tire embryo. Summary of the invention

[0004] In order to solve the problems of shallow bottom depth of deep grooves of drum support blocks, coordination of three groove surfaces and groove surface angles, and insufficient squeezing force on inner mouth of tire blank after sector blocks are raised, which easily leads to serious warping of inner mouth of tire blank, the utility model provides a light truck seamless sector block capsule forming drum structure with inner tube.

[0005] The purpose of the utility model is achieved in the following ways:

[0006] A light truck inner tube seamless sector block capsule forming drum structure comprises a capsule forming drum provided with seamless sector blocks, the capsule forming drum is a groove structure, the groove structure is composed of four surfaces, a first side slope is connected to a groove bottom plane, the groove bottom plane is connected to a groove bottom slope, and the groove bottom slope is connected to a second side slope, a depth H1 of the groove bottom plane relative to a left top surface of the sector block is 12 cm, and a depth H2 of the groove bottom plane relative to a right top surface of the sector block is 6 cm.

[0007] The angle between the first side slope and the vertical line is 25°±0.5°, the bottom plane of the groove is a horizontal plane, the angle a1 between the bottom slope of the groove and the horizontal plane is 7°~8°, and the angle between the second side slope and the horizontal plane is 60°±0.5°.

[0008] The width of the first side slope is 12-14 cm, the width of the groove bottom plane is 6-8 cm, the width of the groove bottom slope is 19-21 cm, and the width of the second side slope is 5-7 cm.

[0009] The top of the angle between the first side slope and the groove bottom plane, the top of the angle between the groove bottom plane and the groove bottom slope, and the top of the angle between the groove bottom slope and the second side slope are all rounded.

[0010] Compared with the prior art, the utility model increases the depth of the groove bottom plane relative to the top surface of the sector-shaped block, designs the deep groove surface from three surfaces to four surfaces, retains a part of the original bottom surface, and sets a part of the bottom surface as a groove bottom slope, and adjusts the inclination angle of the first side slope from 30° to 25°, and the inclination angle of the groove bottom slope from 6°~7° to 7°~8°. Such a sector-shaped block does not have the phenomenon of warping of the edge of the tire blank in actual production. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model.

[0012] Figure 2 This is a schematic diagram of the 16-inch tire bead outline.

[0013] Among them, 1 is the first side slope; 2 is the groove bottom plane; 3 is the groove bottom slope; 4 is the second side slope. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution in the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Therefore, the following detailed description of the implementation of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model for which protection is claimed, but merely represents the selected implementation of the utility model.

[0015] In the description of the present invention, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inside", "outside", "back", "middle", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0016] A light truck inner tube seamless sector-shaped block capsule forming drum structure, such as Figure 1 As shown, the capsule forming drum includes a seamless sector block arrangement, the capsule forming drum is a groove structure, the groove structure is composed of four surfaces, the first side slope 1 is connected to the groove bottom plane 2, the groove bottom plane 2 is connected to the groove bottom slope 3, and the groove bottom slope 3 is connected to the second side slope 4. The deep groove groove surface is designed from three surfaces to four surfaces, and a part of the original bottom surface is retained, so that a part of the bottom surface is set as the groove bottom slope 3, which greatly improves the problem of warping of the inner edge of the tire blank.

[0017] The depth of the groove bottom plane 2 relative to the top surface of the fan-shaped block is increased. The utility model increases the depth H1 of the groove bottom plane 2 relative to the top surface of the fan-shaped block on the left side of the groove structure. H1 is 12 cm, which can increase the squeezing force of the fan-shaped block on the inner mouth of the tire blank after the fan-shaped block is raised, and solve the problem of the inner mouth of the tire blank warping. The depth H2 of the groove bottom plane 2 relative to the top surface of the right side of the fan-shaped block is 6 cm, which makes the position of the capsule forming drum mouth flatter, which is conducive to rolling exhaust. After the fan-shaped block is propped up, the end point of the curtain cloth is flat, which solves the problem of not being able to roll the apex.

[0018] The inclination angle of the first side slope 1 (the angle between the first side slope 1 and the vertical line) is 25°±0.5°, the groove bottom plane 2 is a horizontal plane, the inclination angle of the groove bottom slope 3 (the angle a1 between the groove bottom slope 3 and the horizontal plane) is 7°~8°, and the inclination angle of the second side slope 4 (the angle between the second side slope 4 and the horizontal plane) is 60°±0.5°. The forming drums designed within this range of angles have the same effect.

[0019] like Figure 2 As shown in the figure, the tire bead profile is designed with an angle a2. The shape of the tire blank after production using the original fan-shaped block is different from the tire bead profile, which makes it difficult to install the pot during vulcanization production, resulting in finished product defects and tire bead edge defects. Figure 1 As shown, the fan-shaped block of the utility model increases the angle a1 between the groove bottom slope 3 and the horizontal plane, and sets the angle a1 between the groove bottom slope 3 and the horizontal plane of the fan-shaped block capsule forming drum to be close to the tire bead angle, so that the fan-shaped block capsule forming drum and the steel ring have better applicability, the rubber under the steel ring is squeezed more evenly, the locking force is more stable, the consistency of the tire embryo bead shape and the tire bead mold contour is ensured, and the difference in the tire embryo mouth shape between the two-drum light truck forming machine and the three-drum forming drum is reduced, and the problem of the tire bead edge out of the finished product is solved. However, the angle a1 on the fan-shaped block should not exceed 8°. Since the thickness of the capsule at the mouth of the capsule forming drum is only 6mm, the bottom angle of the fan-shaped block is too large. During the lifting process, there is no capsule buffer, which will aggravate the deviation of the steel ring angle and cause a certain degree of flipping. The finished product section is manifested as the end point of the wire cloth turning outward, and the tire mouth cracks and early damage are easy to occur during use.

[0020] The width of the first side slope 1 is 12-14 cm, the width of the groove bottom plane 2 is 6-8 cm, the width of the groove bottom slope 3 is 19-21 cm, and the width of the second side slope 4 is 5-7 cm. According to conventional steps, the thickness of the material under the tire bead and the thickness of the bladder are measured, the expansion circumference of the fan-shaped block is designed, the locking force of the fan-shaped block on the tire bead is improved, and the quality defect of the sub-mouth upward drawing is solved.

[0021] The top of the angle between the first side slope 1 and the groove bottom plane 2, the top of the angle between the groove bottom plane 2 and the groove bottom slope 3, and the top of the angle between the groove bottom slope 3 and the second side slope 4 are all rounded corners, and the rounded corner design makes demoulding easier.

[0022] The original fan-shaped blocks are of a seam structure, and the gap between the fan-shaped blocks is 15mm. When the fan-shaped blocks are raised, bubbles are easily caused in the tire embryo and the surface of the sub-mouth has fan-shaped block indentations, which directly cause the quality problems of bead bubbles and bead edge defects in the finished tire. The utility model changes the original seam structure into a seamless structure, eliminates the gaps between the fan-shaped blocks, and solves the quality defects of bead bubbles and bead rubber deficiency caused by the large gaps between the fan-shaped blocks. The existing technology (201120088156.1) is used to change the original seam structure of the fan-shaped blocks into a seamless structure, which will not be repeated here.

[0023] The utility model, under the premise of ensuring that the regular hexagon of the steel ring is not affected, increases the depth of the groove bottom plane 2 relative to the top surface of the sector block, designs the deep groove surface from three surfaces to four surfaces, and retains a part of the original bottom surface, so that a part of the bottom surface is set as a groove bottom slope, and adjusts the inclination angle of the first side slope from 30° to 25°, and the inclination angle of the groove bottom slope from 6° to 7° to 7° to 8°. In actual production, such a sector block does not have the phenomenon of warping of the inner spur of the tire embryo. The inner spur of the tire embryo produced by the utility model does not have the phenomenon of warping of the inner spur of the tire embryo.

[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be regarded as the protection scope of the present invention.

Claims

1. A light truck inner tube seamless sector-shaped block capsule forming drum structure, comprising a capsule forming drum with seamless sector-shaped blocks, the capsule forming drum being a groove-shaped structure, characterized in that: The groove structure is composed of four surfaces, wherein the first side slope (1) is connected to the groove bottom plane (2), the groove bottom plane (2) is connected to the groove bottom slope (3), and the groove bottom slope (3) is connected to the second side slope (4), the depth H1 of the groove bottom plane (2) relative to the left top surface of the fan-shaped block is 12 cm, and the depth H2 of the groove bottom plane (2) relative to the right top surface of the fan-shaped block is 6 cm.

2. A light truck inner tube seamless sector-shaped block bladder forming drum structure according to claim 1, characterized in that: The angle between the first side slope (1) and the vertical line is 25°±0.5°, the groove bottom plane (2) is a horizontal plane, the angle a1 between the groove bottom slope (3) and the horizontal plane is 7°~8°, and the angle between the second side slope (4) and the horizontal plane is 60°±0.5°.

3. A light truck inner tube seamless sector-shaped block bladder forming drum structure according to claim 1, characterized in that: The width of the first side slope (1) is 12-14 cm, the width of the groove bottom plane (2) is 6-8 cm, the width of the groove bottom slope (3) is 19-21 cm, and the width of the second side slope (4) is 5-7 cm.

4. A light truck inner tube seamless sector-shaped block bladder forming drum structure according to claim 1, characterized in that: The top of the angle between the first side slope (1) and the groove bottom plane (2), the top of the angle between the groove bottom plane (2) and the groove bottom slope (3), and the top of the angle between the groove bottom slope (3) and the second side slope (4) are all rounded.

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