Heating piece and tire mold

Abstract

The utility model discloses a heating element and a tire mold, and belongs to the technical field of tire molds, the heating element is provided with at least one steam chamber, the steam chamber is provided with a heat exchange surface, the heat exchange surface is provided with a plurality of first extension parts, the first extension parts protrude out of the heat exchange surface, and a diversion trench is formed between every two adjacent first extension parts. The depths of the plurality of flow guide grooves in the heat exchange surface are the same; the tire mold comprises an upper cover plate, a sliding block, an upper side plate, an upper steel ring, a pattern block, a lower side plate, a base, a lower steel ring and a guide ring, any one or more of the upper cover plate, the sliding block, the upper side plate, the upper steel ring, the pattern block, the lower side plate, the base, the lower steel ring and the guide ring are the heating pieces. According to the tire mold, the heat exchange structure is optimized, the effective heat exchange area is increased under the limited steam chamber area, the heat transfer area of a heating piece and steam is increased, the heat exchange efficiency is improved, the over-vulcanization problem of the tire side is reduced or eliminated, and the tire yield is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tire molds, in particular to a heating element and a tire mold. Background Art

[0002] Tire molds are key components for vulcanized tires and determine the quality, performance, and cost of tires. Figure 1 As shown, the tire mold includes an upper side plate 2, an upper cover plate 1, an upper rim 3, a guide ring 8, tread blocks 7, a lower side plate 5, a base 6, and a lower rim 4. During tire vulcanization, the tire top relies on the guide ring 8 to provide heat to the tire blank. Existing mold heating structures are irrational. Because the tire top rubber is thicker, vulcanization takes longer than the sidewalls. To ensure that the rubber in all parts of the tire is fully cooked, the top rubber must be fully cooked before the tire is opened. This can cause the sidewall rubber to overcure, leading to decreased tire performance or even failure. This increases vulcanization time, reduces vulcanization efficiency, and increases tire cost. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the utility model provides a heating element and a tire mold. By improving the heat exchange structure of the mold, the heat transfer efficiency of the mold is improved, the vulcanization time is shortened, the vulcanization efficiency is improved, and the tire production cost is reduced.

[0004] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0005] On the one hand, the utility model provides a heating element, which is provided with at least one steam chamber, the steam chamber having a heat exchange surface, and the heat exchange surface being provided with a plurality of first extension portions, the first extension portions protruding from the heat exchange surface, and a guide groove is formed between two adjacent first extension portions, and the depth of the multiple guide grooves on the heat exchange surface is the same.

[0006] In the above-mentioned heating element, a plurality of the first extension portions are distributed on a part of the heat exchange surface or on the entire heat exchange surface;

[0007] And / or, a connecting groove is provided on the heat exchange surface, and the connecting groove is connected to the area of ​​the heat exchange surface between the two first extension portions;

[0008] And / or, the first extension portion extends along the flow direction of the heat exchange medium in the steam chamber;

[0009] and / or, a plurality of the first extension portions are arranged in parallel and at intervals on the heat exchange surface;

[0010] and / or, the cross section of the first extension portion is arc-shaped, triangular, rectangular, or trapezoidal;

[0011] and / or, an outer edge of an upper side surface of the first extension portion located at a vertically extending portion of the heat exchange surface extends obliquely downward;

[0012] And / or, a confluence groove is provided at the bottom of the steam chamber for guiding condensed water to discharge from the steam chamber.

[0013] In the above-mentioned heating element, the heat exchange surface between two adjacent first extension portions is concave to form a second extension portion.

[0014] In the above-mentioned heating element, the cross-sectional shapes of the second extension portion and the first extension portion are inverted with each other.

[0015] On the other hand, the utility model provides a tire mold, including an upper cover plate, a slider, an upper side plate, an upper steel rim, a tread block, a lower side plate, a base, a lower steel rim and a guide ring; any one or more of the upper cover plate, the slider, the upper side plate, the upper steel rim, the tread block, the lower side plate, the base, the lower steel rim and the guide ring is the above-mentioned heating element.

[0016] In the above tire mold, the heat exchange surface extends in the entire circumference of the mold to form the annular steam chamber.

[0017] In the above tire mold, the heating element is located on the outside of the mold cavity in the radial direction, and a plurality of the steam chambers are spaced apart in the axial direction of the mold.

[0018] In the above tire mold, the guide ring is a heating element, and the minimum distance between the heat exchange surface and the mating surfaces at both ends of the guide ring is not less than 20 mm;

[0019] and / or, the minimum distance between the heat exchange surface and the inner conical surface of the guide ring is not less than 10 mm,

[0020] And / or, the minimum distance between the heat exchange surface and the hole on the inner conical surface of the guide ring is not less than 3 mm.

[0021] In the above tire mold, the heating element is located at one axial end of the mold cavity, and a plurality of the steam chambers are spaced apart in the radial direction of the mold.

[0022] In the above tire mold, the upper cover plate is a heating element, and the minimum distance between the heat exchange surface and the mating surface of the upper cover plate is not less than 5 mm.

[0023] The beneficial effects of the present invention are as follows:

[0024] The tire mold has an optimized heat exchange structure. Several first extensions are set on the heat exchange surface of the steam chamber. The first extensions protrude from the heat exchange surface, increasing the effective heat exchange area within the limited steam chamber area, increasing the heat transfer area between the heating element and the steam, and improving the heat exchange efficiency.

[0025] Any one or more of the tire mold's upper cover, slider, upper side plate, upper rim, tread block, lower side plate, base, lower rim, and guide ring can be used as heating elements, facilitating temperature control at different locations of the tire mold and enabling non-isothermal vulcanization in different areas, providing more options for tire vulcanization and testing.

[0026] In particular, when the guide ring is a heating element, the heat transfer area of ​​the steam chamber of the guide ring is increased, the steam utilization rate is improved, the vulcanization time of the tire top is shortened, the time difference between the maturity of the tire top and the sidewall is reduced, the overall vulcanization time of the tire is shortened, the vulcanization efficiency is improved, and the tire production cost is reduced; the problem of over-sulfurization on the sidewall is reduced or eliminated, and the tire yield rate is improved;

[0027] The plurality of first extensions are spaced apart and arranged side by side in a wave shape. Whether it is an arc wave, an angular wave, or a rectangular wave, the interval between the crest and the trough increases the surface area of ​​the heat exchange surface, transferring more heat to the pattern block.

[0028] The tire mold of the present application makes the vulcanization effect of all parts of the tire more uniform, improves the overall performance of the tire, and increases customer satisfaction and usage experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a tire mold in the prior art;

[0030] Figure 2 This is a schematic diagram of the overall structure of the first embodiment of the tire mold of the present utility model;

[0031] Figure 3 for Figure 2 Enlarged view of area A in the middle;

[0032] Figure 4 for Figure 2 Enlarged view of area B in the middle;

[0033] Figure 5 This is a schematic diagram of the partial structure of the steam chamber in the tire mold of the present invention;

[0034] Figure 6 This is a schematic diagram of the overall structure of the second embodiment of the tire mold of the present invention;

[0035] Figure 7 This is a schematic diagram of the overall structure of the third embodiment of the tire mold of the present utility model;

[0036] Figure 8This is a schematic diagram of the overall structure of the fourth embodiment of the tire mold of the present utility model;

[0037] Figure 9 This is a schematic diagram of the overall structure of a fifth embodiment of the tire mold of the present utility model;

[0038] Figure 10 This is a schematic diagram of the overall structure of a sixth embodiment of the tire mold of the present utility model;

[0039] Figure 11 This is a schematic diagram of the overall structure of a seventh embodiment of the tire mold of the present utility model;

[0040] Figure 12 This is a schematic diagram of the overall structure of an eighth embodiment of the tire mold of the present utility model;

[0041] Figure 13 This is a schematic diagram of the overall structure of a ninth embodiment of the tire mold of the present utility model;

[0042] Figure 14 This is a schematic diagram of the overall structure of the tenth embodiment of the tire mold of the present utility model.

[0043] In the picture:

[0044] 1-upper cover; 2-upper side plate; 3-upper steel ring; 4-lower steel ring; 5-lower side plate; 6-base; 7-patterned block; 8-guide ring; 9-heat exchange surface; 10-steam chamber; 11-baffle; 12-first extension part; 13-second extension part; 14-connecting groove; 15-convergence groove; 16-slider; 17-guide strip. DETAILED DESCRIPTION

[0045] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0046] Please refer to Figure 2-Figure 4 , is an embodiment of a tire mold provided by the utility model, comprising at least one heating element having at least one steam chamber 10; the steam chamber 10 is a closed space surrounded by a heat exchange surface 9 formed by a partial concave portion of the heating element toward the mold cavity side and a baffle 11 covering the opening of the heat exchange surface 9.

[0047] The heat exchange surface 9 is provided with a plurality of first extensions 12. These first extensions 12 protrude from the heat exchange surface 9, increasing the limited area of ​​the heat exchange surface 9 and thereby increasing the heat transfer area between the steam within the steam chamber 10 and the heating element. The first extensions 12 can be distributed over a portion of the heat exchange surface 9 or over the entire heat exchange surface 9. Because the first extensions 12 protrude from the heat exchange surface 9, guide grooves are formed between two adjacent first extensions 12. This creates multiple guide grooves on the heat exchange surface 9, each with the same depth, ensuring a balanced processing quality and effective heat exchange area for the heat exchange surface 9.

[0048] Several first extensions 12 can be irregularly distributed on the heat exchange surface 9; however, for ease of processing and production, the first extensions 12 are preferably regularly arranged on the heat exchange surface 9, with several first extensions 12 arranged in sequence and in parallel, for example, arranged in a wave shape; the end of the first extension 12 away from the heat exchange surface 9 forms a wave crest, and the two first extensions 12 form a wave trough. The cross section of the first extension 12 can be an arc, a triangle, a rectangle, or a trapezoid; depending on the cross section of the first extension 12, several first extensions 12 can be distributed as follows: Figure 2 、 Figure 6 The curved waves shown, or Figure 8 The angular waves shown, Figure 7 The rectangular waves shown, Figure 9 The cross-section of the first extension portion 12 can also be adjusted based on the actual application location and space size, and is not limited to arc, triangle, rectangle, trapezoid, etc. Preferably, the first extension portions 12 are evenly distributed on the heat exchange surface 9, and the spacing W between two adjacent first extension portions 12 is maintained uniform.

[0049] Furthermore, the heat exchange surface 9 between the two first extensions 12, that is, the bottom wall of the guide groove is concave toward the inner side of the heat exchange surface 9, forming a second extension 13, further extending the heat exchange area between the guide ring 8 and the steam. As an embodiment of the second extension 13, the cross-sectional shape of the second extension 13 and the first extension 12 are inverted. Figure 3 、 Figure 8 As shown; the height of the first extension portion 12 protruding from the heat exchange surface 9 is equal to the depth of the second extension portion 13 recessed from the heat exchange surface 9. Of course, the cross-sectional shape of the second extension portion 13 can also be any shape unrelated to the first extension portion 12, such as Figure 6 、 Figure 7 、 Figure 9 shown.

[0050] The heat exchange medium circulated in the steam chamber 10 exchanges heat with the heat exchange surface 9. The first extension 12 and the second extension 13 can greatly expand the effective heat exchange surface within the limited space of the steam chamber 10, thereby improving the heat exchange efficiency. When high-temperature steam is used as the heat exchange medium, condensed water will be generated after the high-temperature steam exchanges heat with the heat exchange surface 9. If the condensed water is retained on the heat exchange surface 9, it will affect the heat exchange efficiency. In order to drain the condensed water out of the steam chamber 10, a connecting groove 14 is also provided on the heat exchange surface 9. Figure 5 The connecting groove 14 connects to the trough position of the heat exchange surface 9, that is, the area between two adjacent first extensions 12, which can cut off the obstruction formed by the protruding first extensions 12, avoid forming a dead angle for liquid flow, and guide the liquid flow out of the steam chamber 10.

[0051] Preferably, the first extension portion 12 extends along the flow direction of the heat exchange medium in the steam chamber 10 ; this not only ensures effective contact between the steam and the first extension portion 12 , but also allows the flow of high-temperature steam to bring the liquid out of the steam chamber 10 .

[0052] Furthermore, the outer edge of the upper side of the first extension portion 12, located in the vertical extension portion of the heat exchange surface 9, extends downwardly at an angle, eliminating any water accumulation area on the first extension portion 12 and ensuring that condensed water does not accumulate. A confluence groove 15 is preferably provided at the bottom of the steam chamber 10 and communicates with the connecting groove 14 to guide condensed water out of the steam chamber 10.

[0053] Please refer to Figures 1-14 The tire mold includes an upper cover plate 1, an upper side plate 2, an upper steel rim 3, a lower steel rim 4, a lower side plate 5, a base 6, a tread block 7, and a guide ring 8. The upper side plate 2, upper steel rim 3, tread block 7, lower side plate 5, and lower steel rim 4 are assembled together to form the molding surface. The upper side plate 2 and upper steel rim 3 are connected to the upper cover plate 1 and rise and fall synchronously. The lower steel rim 4 and lower side plate 5 are fixed to the base 6. The tread block 7 is connected to the upper cover plate 1 via a bow seat and a slider 16. It can slide radially relative to the upper cover plate 1 and rise and fall synchronously with the upper cover plate 1. The guide ring 8 is mounted on the outside of the bow seat and can drive the tread block 7 to move radially via a guide bar 17. The connection and assembly relationship between the various components of the tire mold are all prior art and have not been improved in this application, so they will not be described in detail here. Any one or more of the upper cover plate 1 , the slider 16 , the upper side plate 2 , the upper steel ring 3 , the lower steel ring 4 , the lower side plate 5 , the base 6 , the pattern block 7 and the guide ring 8 is the above-mentioned heating element.

[0054] For example, the guide ring 8 is a heating element, such as Figure 2 and Figure 3 As shown, the outer wall of the guide ring 8 is partially concave to form a heat exchange surface 9; the heat exchange surface 9 can be distributed in a point-like manner on the outer wall of the guide ring 8. Preferably, the heat exchange surface 9 is annular and extends along the entire circumference of the guide ring 8 to form an annular steam chamber 10.

[0055] Since the guide ring 8 surrounds the side of the mold cavity, if two or more steam chambers 10 are set in the guide ring 8, the steam chambers 10 are spaced apart in the axial direction of the mold, such as Figure 10-14 The number of the steam chambers 10 on the guide ring 8 can also be set as needed, not limited to one or two, but can also be multiple.

[0056] The first extension portion 12 extends along the circumference of the guide ring 8. In the axial direction of the guide ring 8, several first extension portions 12 are arranged in sequence at intervals to form a wave-like shape distributed up and down. The connecting groove 14 extends axially, connecting multiple second extension portions 13, and guiding the water stored in the second extension portions 13 to be discharged from the air outlet. The lower side of the heat exchange surface 9, that is, the bottom of the steam chamber 10, is provided with a confluence groove 15. The confluence groove 15 extends circumferentially and connects with the lower side of the axially extending connecting groove 14, converging the condensed water in the multiple connecting grooves 14 and discharging it under the action of airflow. Preferably, the depth of the connecting groove 14 is greater than or equal to the depth of the second extension portion 13, so that the condensed water in the second extension portion 13 converges into the connecting groove 14, further facilitating the discharge of the condensed water, while also increasing the contact area and improving the heat transfer performance.

[0057] The first extension portion 12 and the second extension portion 13 can transfer more heat to the tread block 7, thereby improving steam utilization, reducing steam usage, shortening the tire top vulcanization time, reducing the time difference between the tire top and sidewall maturation, eliminating the tire over-sulfurization problem, shortening the overall tire vulcanization time, improving vulcanization efficiency, and reducing tire production costs.

[0058] The cross-sectional shape of the heat exchange surface 9 can be set according to actual needs. For example, the heat exchange surface 9 has a first end face, a second end face, and an inner side face connecting the first and second end faces, and the first and second end faces are parallel to the end face of the guide ring 8. Preferably, in order to balance the strength and heat exchange performance of the guide ring 8, the inner side face is partially parallel to the inner conical surface of the guide ring 8 to ensure consistent temperature at the pattern block 7.

[0059] In order to ensure the mechanical strength of the guide ring 8, the minimum distance H1 between the heat exchange surface 9 and the mating surfaces at both ends of the guide ring 8 shall not be less than 20 mm; the minimum distance H2 between the heat exchange surface 9 and the inner conical surface of the guide ring 8 shall not be less than 10 mm, and the minimum distance H3 between the heat exchange surface 9 and the hole on the inner conical surface of the guide ring 8 shall not be less than 3 mm, regardless of whether the hole on the inner conical surface of the guide ring 8 is a blind hole or a screw hole.

[0060] For another example, the upper cover plate 1 is a heating element, such as Figure 4As shown, the heat exchange surface 9 is annular, and the steam chamber 10 is also annular. Because the steam chamber 10 is located at the end of the mold cavity, when the upper cover plate 1 is provided with multiple steam chambers 10, the multiple annular steam chambers 10 are spaced apart in the radial direction of the mold. The first extension 12 extends along the circumference of the mold. In the radial direction of the upper cover plate 1, several first extensions 12 are spaced apart in the radial direction of the mold, forming a wavy shape from the inside out. The connecting groove 14 extends radially, connecting the multiple second extensions 13, and guiding the water stored in the second extensions 13 to be discharged through the outlet.

[0061] The minimum distance H4 between the mating surface of the heat exchange surface 9 and the upper cover plate 1 is not less than 5 mm to ensure the strength of the upper cover plate 1.

[0062] In actual applications, the settings of the steam chamber 10 of the upper side plate 2, upper steel ring 3, lower side plate 5, base 6, and lower steel ring 4 on the upper and lower sides of the mold cavity can refer to the upper cover plate 1; and for the pattern block 7 on the side of the mold cavity, the settings of the steam chamber 10 can refer to the guide ring 8.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A heating element, characterized in that: The heating element is provided with at least one steam chamber (10), the steam chamber (10) having a heat exchange surface (9), a plurality of first extension portions (12) being provided on the heat exchange surface (9), the first extension portions (12) protruding from the heat exchange surface (9), a guide groove being formed between two adjacent first extension portions (12), and the depths of the plurality of guide grooves on the heat exchange surface (9) being the same.

2. A heating element according to claim 1, characterized in that: A plurality of the first extension portions (12) are distributed on a part of the heat exchange surface (9) or on the entire heat exchange surface (9); And / or, a connecting groove (14) is provided on the heat exchange surface (9), and the connecting groove (14) is connected to the area of ​​the heat exchange surface (9) between the two first extension portions (12); and / or, the first extension portion (12) extends along the flow direction of the heat exchange medium in the steam chamber (10); and / or, a plurality of the first extension portions (12) are arranged in parallel and at intervals on the heat exchange surface (9); and / or, the cross section of the first extension portion (12) is arc-shaped, triangular, rectangular, or trapezoidal; and / or, the outer edge of the upper side surface of the first extension portion (12) located at the vertical extension portion of the heat exchange surface (9) extends obliquely downward; And / or, a confluence groove (15) is provided at the bottom of the steam chamber (10) for guiding condensed water to be discharged from the steam chamber (10).

3. A heating element according to claim 1, characterized in that: The heat exchange surface (9) between two adjacent first extension portions (12) is concave to form a second extension portion (13).

4. A heating element according to claim 3, characterized in that: The cross-sectional shapes of the second extension portion (13) and the first extension portion (12) are inverted.

5. A tire mold, characterized in that: It comprises an upper cover plate (1), a slider (16), an upper side plate (2), an upper steel ring (3), a pattern block (7), a lower side plate (5), a base (6), a lower steel ring (4) and a guide ring (8); any one or more of the upper cover plate (1), the slider (16), the upper side plate (2), the upper steel ring (3), the pattern block (7), the lower side plate (5), the base (6), the lower steel ring (4) and the guide ring (8) is the heating element according to any one of claims 1 to 4.

6. A tire mold according to claim 5, characterized in that: The heat exchange surface (9) extends along the entire circumference of the mold to form the annular steam chamber (10).

7. The tire mold according to claim 6, characterized in that: The heating element is located on the radially outer side of the mold cavity, and a plurality of steam chambers (10) are spaced apart in the axial direction of the mold.

8. The tire mold according to claim 7, characterized in that: The guide ring (8) is a heating element, and the minimum distance between the heat exchange surface (9) and the mating surfaces at both ends of the guide ring (8) is not less than 20 mm; and / or, the minimum distance between the heat exchange surface (9) and the inner conical surface of the guide ring (8) is not less than 10 mm, And / or, the minimum distance between the heat exchange surface (9) and the hole on the inner conical surface of the guide ring (8) is not less than 3 mm.

9. The tire mold according to claim 6, characterized in that: The heating element is located at one axial end of the mold cavity, and a plurality of steam chambers (10) are arranged at intervals in the radial direction of the mold.

10. The tire mold according to claim 9, characterized in that: The upper cover plate (1) is a heating element, and the minimum distance between the heat exchange surface (9) and the matching surface of the upper cover plate (1) is not less than 5 mm.

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