Fan-shaped block tool for ensuring uniform compression of tire blank seam allowance part

Abstract

The invention belongs to the technical field of tire forming, and particularly relates to a fan-shaped block tool for ensuring uniform compression of a tire blank seam allowance part. Comprising a first fan-shaped block and a second fan-shaped block, the first fan-shaped block comprises a first arc-shaped surface and first side planes which are arranged on the two sides and extend outwards, the second fan-shaped block comprises a second arc-shaped surface and second side planes which are arranged on the two sides and converge inwards, and in the using state, the first side planes and the second side planes are matched with each other, so that the fan-shaped block is formed. The first fan-shaped blocks and the second fan-shaped blocks are alternately arranged, and the first arc-shaped faces and the second arc-shaped faces are connected to form a circular ring. By adjusting the tangent plane embedded cross connection form and the inclined plane structure of the fan-shaped blocks, the seamless state of the fan-shaped blocks in the rising process within a certain diameter range is achieved, and uniform compression of all points of a bead seam allowance is guaranteed. Seamlessness of the fan-shaped blocks in different diameter states is guaranteed through design, and therefore the effect that all points of the bottom of the tire bead are evenly stretched is achieved. And finally, the problems of uneven tire bead part and poor matching degree with the tire of the finished tire can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of tire molding, and in particular relates to a fan-shaped block tooling for ensuring uniform compression of a tire blank opening. Background Art

[0002] Tires are indispensable components for vehicles such as cars and trucks, and the performance of these vehicles is closely related to the characteristics of tires. The bead part of the tire is responsible for fixing the tire on the rim, transmitting the driving force, braking force and rotational force of the vehicle to the ground. It not only prevents the tire from falling off the rim, but also strengthens the rigidity of the sidewall part, bears the force of tire deformation on the tire, ensures the driving, braking and handling safety of the vehicle, and is an important component for tire safety.

[0003] The molding process is the process of combining various semi-finished parts. In addition to the wire ring, the tire bead materials also include the inner liner, sidewall wear-resistant rubber, wire bead wrap, tire body, etc. The bead materials are locked together by fan-shaped blocks. Because there are more materials in the tire bead, they are tightly combined together.

[0004] Currently, fan-shaped blocks are divided into two types: with seams and without seams.

[0005] The advantage of the gapped sector blocks is that the raised diameter of the sector blocks can be adjusted dynamically during operation. When the thickness of the bead material fluctuates, the raised diameter of the sector blocks will also change accordingly, which can ensure the bead is locked. The disadvantage is that there are gaps between adjacent sector blocks, and the material between the gaps is not compressed, resulting in inconsistent forces at each point, making the tire bead uneven, and the tightness of each point when it is in contact with the rim is different, resulting in the occurrence of tire jumping problems.

[0006] The advantage of seamless sector blocks is that there is no gap between adjacent sector blocks in the working state, which can ensure that the material at the bottom of the tire bead is evenly locked, the bead part of the finished tire is flat, and the matching degree with the tire is good. The disadvantage is that the lifting diameter of the current seamless sector blocks cannot be adjusted in the working state. When the thickness of the bead part material changes, it is easy to cause the cord to be pulled back or locked too tightly, and the bead material is compressed too much, resulting in defects such as bending of the finished tire cord or narrow bead. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a fan-shaped block tooling that ensures uniform compression of the tire embryo mouth, thereby solving the problems of uneven bead area of ​​the finished tire, poor matching with the tire and unadjustable diameter.

[0008] The present invention is achieved in this way. A fan-shaped block tooling for ensuring uniform compression of the tire embryo mouth part, comprising: A first fan-shaped block and a second fan-shaped block, the first fan-shaped block includes a first arcuate surface and first side planes extending outward on both sides, the second fan-shaped block includes a second arcuate surface and second side planes converging inward on both sides, when in use, the first side plane and the second side plane are matched with each other, the first fan-shaped blocks and the second fan-shaped blocks are alternately arranged, and the first arcuate surface is connected with the second arcuate surface to form a ring.

[0009] Furthermore, the first arc-shaped surface and the second arc-shaped surface have the same curvature.

[0010] Furthermore, the first sector block is provided with a protrusion structure on two first side planes respectively; and the second sector block is provided with a groove structure on two second side planes respectively.

[0011] Furthermore, a first step is formed between the protruding structure and the first curved surface, and is slightly protruding from the first curved surface; the arc length of the first curved surface of the first fan-shaped block is greater than the arc length of the bottom surface of the first fan-shaped block, and the bottom surface of the first fan-shaped block and the protruding structure form a second step.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The present invention achieves seamless state of the forming drum sector blocks within a certain range of diameters by cross-matching adjacent sector blocks, thereby ensuring that the bead portion material can be evenly locked and compressed uniformly when the bead portion material thickness is different.

[0013] The present invention achieves a seamless effect based on the local cross-matching and bevel arrangement of the inclined surfaces of adjacent fan-shaped blocks. The joint sections of adjacent fan-shaped blocks are beveled, that is, they are distributed with acute angles and obtuse angles. During the lifting process, the acute angles and obtuse angles are matched to ensure that there are no gaps around the fan-shaped blocks. When lifted to the maximum height, the two bevels completely overlap.

[0014] The present invention adjusts the embedded cross-connection form and the inclined structure of the sector block section to achieve a seamless state when the sector block is raised within a certain diameter range, so as to ensure uniform compression of each point at the bead opening. The design ensures that the sector block is seamless under different diameters, thereby achieving the effect of uniform stretching of each point at the bottom of the bead. Finally, the problem of uneven bead area of ​​the finished tire and poor matching with the tire can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a fan-shaped block tooling provided in an embodiment of the present invention; Figure 2 A schematic structural diagram of a first sector block provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] See also Figure 1 As shown, a fan-shaped block tooling for ensuring uniform compression of the tire embryo mouth provided by an embodiment of the present invention comprises a first fan-shaped block 1 and a second fan-shaped block 2 of different shapes, the first fan-shaped block 1 and the second fan-shaped block 2 are arranged alternately, that is, the two sides of a first fan-shaped block 1 are the second fan-shaped blocks 2, alternately forming a ring. The first fan-shaped block 1 and the second fan-shaped block 2 are controlled by a double connecting rod.

[0018] Among them, the first sector block 1 includes a first arcuate surface 3 and first side planes 5 extending outward on both sides, that is, the cross-sections on both sides are obtuse angles, and the second sector block 2 includes a second arcuate surface 4 and second side planes 6 converging inward on both sides, that is, the cross-sections on both sides are acute angles. When in use, the first side plane 5 and the second side plane 6 are mutually matched. After the first sector block 1 and the second sector block 2 are alternately arranged, the first arcuate surface 3 and the second arcuate surface 4 contact to form a circular ring. Within a certain acceptable range, there can be a certain gap between the first arcuate surface and the second arcuate surface, so as to adjust the diameter of the formed circle. When the thickness of the material to be locked fluctuates, the material locking is ensured by adjusting the diameter.

[0019] In this embodiment, the first arc-shaped surface and the second arc-shaped surface have the same curvature, so that the first arc-shaped surface and the second arc-shaped surface have exactly the same shape and area.

[0020] In this embodiment, the first sector block is provided with protrusion structures 7 on two first side planes respectively; and the second sector block is provided with a groove structure on two second side planes respectively.

[0021] See also Figure 2 As shown, a first step 9 is formed between the raised structure 7 and the first curved surface 3, and is slightly protruding from the first curved surface 3; the arc length of the first curved surface 3 of the first sector block is greater than the arc length of the bottom surface 10 of the first sector block, and the bottom surface 10 of the first sector block and the raised structure form a second step 8, and the raised structure forms a wedge shape.

[0022] When the fan-shaped block is raised, the protrusion structure is inserted into the groove structure to connect and fix it. When the diameter is changed within a certain range, the diameter of two adjacent fan-shaped blocks can still be fine-tuned within a certain range by the degree to which the protrusion structure is inserted into the groove structure. At this time, the overall strength of the fan-shaped block is guaranteed due to the cooperation between the protrusion structure and the groove structure.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fan-shaped block tooling for ensuring uniform compression of the tire embryo mouth, characterized in that: The fan-shaped block tooling comprises: A first fan-shaped block and a second fan-shaped block, the first fan-shaped block includes a first arcuate surface and first side planes extending outward on both sides, the second fan-shaped block includes a second arcuate surface and second side planes converging inward on both sides, when in use, the first side plane and the second side plane are matched with each other, the first fan-shaped blocks and the second fan-shaped blocks are alternately arranged, and the first arcuate surface is connected with the second arcuate surface to form a ring.

2. The fan-shaped block tooling for ensuring uniform compression of the tire blank opening according to claim 1 is characterized in that: The first arc-shaped surface and the second arc-shaped surface have the same curvature.

3. The fan-shaped block tooling for ensuring uniform compression of the tire blank opening according to claim 1 is characterized in that: The first sector block is provided with a convex structure on two first side planes respectively; and the second sector block is provided with a groove structure on two second side planes respectively.

4. The fan-shaped block tooling for ensuring uniform compression of the tire blank opening according to claim 1, characterized in that: A first step is formed between the protruding structure and the first curved surface, and is slightly protruding from the first curved surface; the arc length of the first curved surface of the first sector block is greater than the arc length of the bottom surface of the first sector block, and the bottom surface of the first sector block and the protruding structure form a second step.

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