NON-INFLATABLE HOLLOW TIRE MOULD

Abstract

The invention discloses an inflation-free hollow tire modeling die which comprises a die base, die cores and a core holder. The front face, facing a discharge outlet of an extrusion forming machine, of the die base is provided with a concaved feeding cavity, and the bottom of the feeding cavity is provided with a modeling cavity running through the back face of the die base. The core holder is an arc support or a triangular support, supporting feet of the support are fixed to the outer edge portion of the feeding cavity, the top of the support is located in front of the modeling cavity, each die core is in suspended mode and comprises a columnar main body, each die core corresponds to an inner cavity of a tire, the length direction of each die core is perpendicular to the front face and the back face of the die holder, the head ends of the die cores are fixedly connected with the core holder, the tail ends of the die cores are extended backwards and positioned in the modeling cavity, the cross section shapes and relative positions in the modeling cavity of the die cores are matched with the internal structure and tire shapes of tires, and the cross section shape of the modeling cavity is matched with the contours of the tires. By means of the structure, the die mechanical strength is ensured, meanwhile, retardation and eddy currents are avoided for rubber materials in the whole extrusion process, and the quality of tire billets and tire products is ensured.

Claims

1. An inflation-free hollow tire modeling die comprising: a die base 10, at least one die core 20 and at least one core holder 30; the front face, facing a discharge outlet of an extrusion forming machine, of the die base 10 is provided with a concaved feeding cavity 11, and the bottom of the feeding cavity 11 is provided with a modeling cavity 12 running through the back face of the die base 10; the at least one core holder 30 is an arc support or a triangular support, supporting feet of the support are fixed to the outer edge portion of the feeding cavity 11, the top of the support is located in front of the modeling cavity 12; the at least one die core 20 is a suspended die core 20 whose main bodies is columnar, the die core 20 corresponds to an inner cavity of a tire, the length direction of the die core 20 is perpendicular to the front face and the back face of the die base 10, a head end of the die core 20 is fixedly connected to the core holder 30, and a tail end of the die core 20 is extended backward and positioned in the modeling cavity 12; and the shape of the cross-section of the die core 20 and a relative position of the die core 20 in the modeling cavity 12 are matched with the internal structure and the tire shape of the tire, and the shape of the cross-section of the modeling cavity 12 is matched with the contour of the tire.

2. The inflation-free hollow tire modeling die according to claim 1, wherein the surface of the feeding cavity 11 is manufactured into a bowl-shaped concave face, a trumpet-shaped concave face, or a conical concave face.

3. The inflation-free hollow tire modeling die according to claim 1, wherein the protrusion at an intersection between the feeding cavity 11 and the modeling cavity 12 is set to an outer chamfer surface.

4. The inflation-free hollow tire modeling die according to claim 1, wherein the cross-section of the at least one core holder 30 has a streamlined ridge.

5. The inflation-free hollow tire modeling die according to claim 4, wherein the streamlined cross-section of the ridge of the foregoing core holder 30 is narrow at the top and wide at the bottom, in an egg shape, a pear shape, or a heart shape.

6. The inflation-free hollow tire modeling die according to claim 1, wherein the arc support comprises cross-connected arched supports or docked half-arched supports.

7. The inflation-free hollow tire modeling die according to claim 6, wherein an angle in a position where the supports are connected is set to an inner chamfer.

8. The inflation-free hollow tire modeling die according to claim 1, wherein an angle in a top position where the triangular support connects is set to an inner chamfer.

9. The inflation-free hollow tire modeling die according to claim 1, wherein an angle in a position where the supporting feet of the core holder 30 are connected to the feeding cavity 11 is set to an inner chamfer.

10. The inflation-free hollow tire modeling die according to claim 1, wherein the columnar main body of the die core 20 is suspended in the modeling cavity 12, and the main body is not in contact with the cavity wall of the modeling cavity 12; the head end and main body of the die core 20 have the same thickness, or the die core 20 gradually becomes thicker from the head end to the main body.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG. 1 is a schematic three-dimensional structural diagram of Embodiment 1;

[0020] FIG. 2 is a cross-sectional view of a feeding cavity having a bowl-shaped concave face of Embodiment 1;

[0021] FIG. 3 is a cross-sectional view of a feeding cavity having a trumpet-shaped concave face;

[0022] FIG. 4 is a cross-sectional view of a feeding cavity having a conical concave face;

[0023] FIG. 5 is a schematic diagram of an egg-shaped cross-section of a core holder;

[0024] FIG. 6 is a schematic diagram of a heart-shaped cross-section of a core holder;

[0025] FIG. 7 is a schematic diagram of a pear-shaped cross-section of a core holder;

[0026] FIG. 8 is a schematic three-dimensional structural diagram of Embodiment 2;

[0027] FIG. 9 is a schematic three-dimensional structural diagram of Embodiment 3; and

[0028] FIG. 10 is a schematic three-dimensional structural diagram of Embodiment 4.

[0029] In the figures: 10 is a die base, 11 is a feeding cavity, 111 is a bowl-shaped concave face of a feeding cavity, 112 is a trumpet-shaped concave face of a feeding cavity, 113 is a conical concave face of a feeding cavity, 12 is a modeling cavity, 20 is a die core, and 30 is a core holder.

DETAILED DESCRIPTION

[0030] The accompanying drawings disclose specific embodiments of the present invention without limitations, and the specific embodiments are further described below with reference to the accompanying drawings.

Embodiment 1

[0031] Referring to FIG. 1, an inflation-free hollow tire modeling die of this embodiment is used for producing a four-cavity inflation-free tire. The die includes a die base 10, four die cores 20, and a core holder 30 that is formed by two cross-connected arches, the four die cores 20 are connected to four branches of the core holder 30, supporting feet of the four branches of the core holder 30 are fixed to an outer edge portion of a feeding cavity 11, and the arch apex of the core holder is located in front of a modeling cavity 12. To ensure mechanical strength of the die, the die base 10, the die cores 20, and the arched core holder 30 of this embodiment are all made of steel. Provided that the strength is ensured, the die base, the die cores, and the core holder certainly may alternatively be made of another substitute material.

[0032] The arch shape in this embodiment or the present invention refers to a convex arc shape, being high in the middle and low at two ends, of an arched bridge or arched door.

[0033] The front face, facing a discharge outlet of an extrusion molding machine, of the die base 10 is provided with the concave feeding cavity 11, the feeding cavity 11 has a bowl-shaped concave face 111, and the bottom of the feeding cavity 11 is provided with the modeling cavity 12 running through the back face of the die base 10; and an intersection between the feeding cavity 11 and the modeling cavity 12 is provided with a smooth chamfered and rounded transitional surface, as shown in FIG. 2.

[0034] The arched core holder 30 is two arched supports cross-connected to each other and spanning the feeding cavity 11, and the cross-section of each support is in an egg shape being narrow at the top and wide at the bottom, as shown in FIG. 5; an angle in a cross-connection position of the arched core holder 30 is set to an inner chamfer, and is manufactured into a smooth curved face; and an angle in a position where the supporting feet of the arched core holder 30 are welded to the feeding cavity 11 is also set to an inner chamfer, and is manufactured into a smooth curved face.

[0035] The die cores 20 are suspended and positioned in the feeding cavity 11 and the modeling cavity 12 through the fixing function of the core holder 30; columnar portions with the same thickness, suspended in the modeling cavity 12, of the die cores 20 are a main body, the main body is not in contact with the cavity wall of the modeling cavity, each die core 20 corresponds to an inner cavity of a tire, the length direction of the die core is perpendicular to the front face and the back face of the die base 10, a head end of the die core 20 is fixedly connected to the core holder 30, and a tail end of the die core is extended backward and positioned in the modeling cavity 12; and the head end of the die core 20 is relatively thin, the main body is relatively thick, the die core gradually becomes thicker from the head end of the die core to the columnar portions of the main body, the head end of the die core 20 and the core holder 30 are welded as a whole, and a smooth transitional surface is formed by polishing a welding position.

[0036] In this embodiment, the intersection between the feeding cavity 11 and the modeling cavity 12, the angle in the position where the supporting feet of the core holder 30 are connected to the feeding cavity 11, and the position where the die core 20 is connected to the core holder 30 are each provided with a smooth curved face, to avoid corner angles and dead angles in the motion direction of the rubber materials, so that retardation or the eddy current does not occur in the entire process of extruding the rubber materials, thereby ensuring the quality of tire blanks and tire products.

[0037] The shape of the cross-section of the die core 20 and a relative position of the die core in the modeling cavity 12 are matched with the internal structure and the tire shape of the four-cavity inflation-free tire, and the shape of the cross-section of the modeling cavity 12 is matched with the contour of the tire. The internal structure and the tire shape of the tire refer to structures of a tire cavity and a force-bearing holder; each annular hollow cavity of the inflation-free hollow tire is referred to as a tire cavity, and the shape and the size of the tire cavity depend on the shape and the size of the cross-section of the die core 20; a particular rubber structure formed between tire cavities in the tire is referred to as a force-bearing holder, and the structure of the force-bearing holder depends on the shape of the die cores 20 and relative positions of the die cores in the modeling cavity 12; and the physical performance of the inflation-free hollow tire depends on supporting and pulling functions between the force-bearing holders and between a force-bearing holder and the tire wall, so that the structure of the force-bearing holder has a decisive effect on performance and quality of the tire.

Embodiment 2

[0038] Referring to FIG. 8, an inflation-free hollow tire modeling die of this embodiment is used for producing a three-cavity inflation-free tire. A core holder 30 of the die is formed by three docked half-arched branches, and three die cores 20 are connected to the three branches of the core holder 30.

Embodiment 3

[0039] Referring to FIG. 9, an inflation-free hollow tire modeling die of this embodiment is used for producing a single-cavity inflation-free tire. The die includes a die base 10, a die core 20, and an arched core holder 30, the die core 20 is connected to an arch apex position in the middle of the core holder 30, and the cross-section of the arched core holder 30 is in an egg shape being narrow at the top and wide at the bottom. The head end of the die core 20 is relatively thin, the main body is relatively thick, the die core gradually becomes thicker from the head end of the die core to the main body, the head end of the die core and the core holder 30 are welded as a whole, and a smooth transitional surface is formed by polishing a welding position.

Embodiment 4

[0040] Referring to FIG. 10, an inflation-free hollow tire modeling die of this embodiment is used for producing a two-cavity inflation-free tire. The die includes a die base 10, two die cores 20, and a triangular core holder 30. The triangular core holder 30 is formed by welding top portions of two rod-shaped pillars 301 having a heart-shaped cross-section, and a vertex in a position where the two rod-shaped pillars 301 are welded is provided with a smooth curved face with an outer chamfer; and supporting feet of the two rod-shaped pillars 301 are welded to an outer edge of the feeding cavity 11, and an angle in a position where the supporting feet are welded to the feeding cavity 11 is provided with a smooth curved face with an inner chamfer. The two die cores 20 are respectively connected to upper middle positions of the two rod-shaped pillars 301; and the head end of the die core 20 has the same thickness as that of the main body, the head end of the die core 20 and the core holder 30 are welded as a whole, and a smooth transitional surface is formed by polishing a welding position.

[0041] The triangular support in this embodiment or the present invention refers to a support structure formed by connecting top portions of more than two rod-shaped pillars together and fixing the feet to the outer edge of the feeding cavity 11, and two rod-shaped pillars in this support structure and feet thereof are connected to form a triangle. In addition to the two-rod docking structure in this embodiment shown in FIG. 10, there may be further a tripod structure formed by three pillars, a pyramid support structure formed by four pillars, and the like.