An electrically heated tire mold
By machining and assembling windows on the guide ring of a steam-heated tire mold and installing inner electromagnetic heating elements and magnetic strips, the problem of low heat transfer efficiency was solved, achieving efficient and uniform heating and low-cost modification, thus improving energy utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HIMILE MECHANICAL SCI & TECH (SHANDONG) CO LTD
- Filing Date
- 2025-06-23
- Publication Date
- 2026-07-21
AI Technical Summary
When converting existing steam-heated tire molds to electric heating, the heat transfer efficiency is low, the conversion process is cumbersome and costly, and the electric heating components are installed on the outside of the guide ring, which affects the heat transfer efficiency.
A window is machined and assembled on the guide ring of the steam-heated tire mold. An electromagnetic heating element is installed on the inner wall of the cavity, and a magnetic strip and insulation sleeve are used to form a temperature gradient heating, which avoids the steam cavity from affecting heat transfer and improves heat transfer efficiency.
It achieves efficient and uniform heating, reduces modification costs, improves energy utilization, and ensures the structural strength and precision of the guide ring.
Smart Images
Figure CN224528080U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tire mold technology, specifically to an electrically heated tire mold. Background Technology
[0002] Tire molds used in the tire vulcanization process, such as Figure 1 As shown, it typically includes tread blocks 110, bow-shaped seats 120, guide rings 130, steel rims, etc. Tire molds generally use steam heating. The outer side of the guide ring 130 of the steam-heated tire mold is provided with a groove, and a surrounding plate is welded on the opening of the groove, thereby forming an annular, closed chamber 131 inside the guide ring 130. The chamber 131 surrounds the tread blocks 110. High-temperature steam is supplied to the chamber through a steam supply device to heat the tread blocks 110, steel rims, etc., thereby providing a suitable temperature for tire vulcanization.
[0003] However, traditional steam-heated tire molds suffer from low energy conversion efficiency and high waste rate, and are gradually being replaced by electric heating methods. Upgrading existing steam-heated tire molds to electric heating can effectively utilize the large number of existing steam-heated guide rings, reducing resource waste and lowering procurement costs for tire manufacturers. Current electric heating upgrade solutions involve directly installing the electric heating components on the outer surface of the guide rings in the steam-heated tire mold. Since the guide rings contain chambers for steam heating, this affects heat transfer efficiency. Current solutions involve filling these chambers with heat transfer media such as heat-conducting oil to improve heat transfer efficiency, but this method is cumbersome, difficult to seal, requires regular maintenance, and has a high overall cost. Summary of the Invention
[0004] To address the problems existing in the prior art, this utility model provides an electrically heated tire mold that can be applied to the electric heating modification of steam-heated tire molds. It features high heat transfer efficiency, uniform heat transfer, and simple modification operation.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0006] This utility model provides an electrically heated tire mold, including a tire mold body and an electromagnetic heating device; the tire mold body includes a guide ring, an arched seat, and a tread block, the inner side of the guide ring slidingly engages with the arched seat to realize the opening and closing of the tread block; the guide ring has an annular cavity for heating the tread block; the inner wall of the cavity has the same inclination trend as the inner side of the guide ring; the outer wall of the cavity has a plurality of assembly windows, the assembly windows penetrating the outer wall of the cavity radially; the plurality of assembly windows are spaced apart in the circumferential direction of the guide ring, and a support plate is formed between two adjacent assembly windows;
[0007] The electromagnetic heating device includes an electromagnetic heating element and a magnetic strip; the electromagnetic heating element is evenly arranged on the inner wall surface; the magnetic strip is fixedly installed on the radially outer side of the electromagnetic heating element and extends axially on the guide ring.
[0008] In the aforementioned electrically heated tire mold, a covering layer is provided on the outer circumferential surface of the guide ring, and the covering layer is made of a non-magnetic metal material.
[0009] In the aforementioned electrically heated tire mold, a heat-insulating sleeve is provided on the radially outer side of the guide ring, and the heat-insulating sleeve has an electromagnetic isolation layer.
[0010] In the aforementioned electrically heated tire mold, the guide ring is provided with several temperature detection elements;
[0011] And / or, the number of support plates is 6-10.
[0012] In the above-mentioned electrically heated tire mold, the electromagnetic heating element includes several sets of coil groups surrounding the guide ring, and the several sets of coil groups are evenly distributed along the axial direction of the guide ring.
[0013] Alternatively, the electromagnetic heating element may include several sets of disc-shaped coils, which are evenly distributed around the circumference of the guide ring.
[0014] In the above-mentioned electrically heated tire mold, the coil of the electromagnetic heating element is fixed on the inner wall surface by a wire comb; the wire comb is provided in multiple ways, and the multiple wire combs are arranged circumferentially along the inner wall surface.
[0015] In the above-mentioned electrically heated tire mold, the wire comb is fixed on the inner wall surface, and a plurality of slots are machined on the side away from the inner wall surface, the slots being arranged along the axial direction of the guide ring; the coil of the electromagnetic heating element is wound inside the slots;
[0016] And / or, the comb is made of a non-magnetic metal material.
[0017] In the aforementioned electrically heated tire mold, the upper and / or lower sidewalls of the assembly window are provided with slots, and the end of the magnetic strip is embedded in the slot.
[0018] In the aforementioned electrically heated tire mold, the slot extends radially inward from the outer side of the guide ring, does not penetrate the outer wall of the cavity, and forms an inner limiting wall on the radially inner side of the slot.
[0019] In the aforementioned electrically heated tire mold, a gasket is provided between the magnetic strip and the inner limiting wall of the slot.
[0020] The beneficial effects of this utility model are as follows:
[0021] The electric heating tire mold solves the difficulties of modifying the existing steam-heated tire mold with electric heating. It is suitable for the modification of existing steam-heated tire molds, and the modification work is small, the modification process is simple, and it is easy to implement.
[0022] An assembly window is provided through the outer wall of the chamber, and a support plate is set between adjacent assembly windows. This not only exposes the inner wall of the chamber so that the electromagnetic heating element can be directly installed on the inner wall of the chamber, but also provides installation space and fixed support points for the magnetic strip. The support plate is supported between the upper and lower side walls of the chamber, ensuring the overall structural strength of the guide ring and guaranteeing the accuracy of the guide ring.
[0023] By placing the electromagnetic heating element on the inner wall of the chamber, the guide ring can be heated directly, avoiding the problem in the prior art where the electromagnetic heating element is placed on the outside of the guide ring, which affects the heat transfer of the steam chamber. This results in high heating efficiency and good heating effect.
[0024] By using a magnetic strip in conjunction with an electromagnetic heating element, the distance between the magnetic strip and the electromagnetic heating element is shorter and the temperature is higher on the inner wall of the chamber away from the patterned block; while on the inner wall closer to the patterned block, the distance between the magnetic strip and the electromagnetic heating element is longer and the temperature is relatively lower. This creates a temperature gradient that changes with the trend of the inner surface of the guide ring, ultimately achieving a better heat dissipation effect.
[0025] The addition of a covering layer and insulation jacket prevents heat loss and electromagnetic diffusion, further improving the energy utilization rate of the mold. Attached Figure Description
[0026] Figure 1 A schematic diagram of an existing steam-heated tire mold;
[0027] Figure 2 This is a schematic diagram of the structure of the electrically heated tire mold of this utility model;
[0028] Figure 3 This is a schematic diagram of the assembly structure of the guide ring and electromagnetic heating device in the electric heating tire mold of this utility model;
[0029] Figure 4 for Figure 3 A magnified view of a portion of area A in the middle;
[0030] Figure 5 This is a partial cross-sectional view of the guide ring.
[0031] In the picture:
[0032] 100-Tire mold body, 110-Tread block, 120-Arch-shaped seat, 130-Guide ring, 131-Cavity, 132-Inner side wall, 133-Support plate, 134-Assembly window, 135-Slot;
[0033] 200-Electromagnetic heating device, 210-Cable comb, 220-Electromagnetic heating element, 230-Magnetic strip, 240-Covering layer, 250-Insulation sleeve, 260-Temperature detection element. Detailed Implementation
[0034] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.
[0035] Please refer to Figures 2-5 This invention provides an electrically heated tire mold, which can be applied to the electric heating modification of steam-heated molds, overcoming the problem of low conversion efficiency in existing steam-heated tire molds. Specifically, the electrically heated tire mold includes a tire mold body 100 and an electromagnetic heating device 200.
[0036] The tire mold body 100 includes tread blocks 110, an arch-shaped seat 120, a guide ring 130, and a steel rim. Multiple tread blocks 110 are provided; after mold closing, each tread block 110 forms an internal cavity, which cooperates with a capsule located within the cavity to achieve the tire vulcanization process. The tread blocks 110 are fixed inside the arch-shaped seat 120, and the outer surface of the arch-shaped seat 120 slides against the inner surface of the guide ring 130, enabling the tread blocks 110 to open and close. The inner cavity of the guide ring 130 is approximately conical, meaning the inner surface of the guide ring 130 is a conical surface, such as a conical surface or a combination of multiple surfaces. Figure 1 In the guide ring 130 shown, the upper end of the inner side surface of the guide ring 130 is radially inward relative to its lower end; in other existing embodiments, the upper end of the inner side surface of the guide ring 130 may also be radially outward relative to its lower end. A chamber 131 is provided inside the guide ring 130, surrounding the patterned block 110 for heating the patterned block 110. The inner wall 132 of the chamber 131 is parallel or substantially parallel to the inner side surface of the guide ring 130, and both have the same inclination tendency; exemplarily, such as... Figure 2 As shown, the inner wall surface 132 is a conical surface that is substantially parallel to the inner surface of the guide ring 130, or the inner wall surface 132 includes multiple planes that extend along the inclined trend of the inner surface of the guide ring 130 and whose lower ends gradually approach the outer surface of the guide ring 130. The inner wall surface 132 is the area in the inner wall surface of the chamber 131 that is relatively close to the patterned block 110, and the area opposite to the inner wall surface 132 is the outer wall surface of the chamber 131.
[0037] The fit between the patterned block 110, the bow-shaped seat 120, and the guide ring 130 is existing technology, and no improvement is involved in the solution of this application, so it will not be described in detail here.
[0038] Unlike existing steam-heated tire molds, in this technical solution, the cavity 131 of the guide ring 130 is no longer closed. Instead, several assembly windows 134 are machined on the outer wall of the cavity 131, penetrating radially through the outer wall of the cavity 131. These assembly windows 134 are evenly distributed and spaced apart circumferentially around the guide ring 130. A support plate 133 is formed between adjacent assembly windows 134, supporting the upper and lower side walls of the cavity 131. This ensures the structural strength of the guide ring 130, prevents a decrease in the support strength between the upper and lower side walls of the cavity 131, prevents deformation of the guide ring 130, and ensures the fitting accuracy of the guide ring 130. High-temperature steam is no longer introduced into the cavity 131 to heat the tread block 110; instead, an electromagnetic heating device 200 is installed to heat the tread block 110.
[0039] Specifically, the electromagnetic heating device 200 includes an electromagnetic heating element 220 and a magnetic strip 230. The electromagnetic heating element 220 is uniformly arranged on the inner wall 132 of the chamber 131. The magnetic strip 230 is located radially outside the electromagnetic heating element 220, fixedly mounted on a guide ring 130, and extends axially along the guide ring 130, such that the distance between one end of the magnetic strip 230 and the inner wall 132 is smaller than the distance between its other end and the inner wall 132. Because the electromagnetic heating element 220 is uniformly arranged on the inner wall 132 of the chamber 131, its distribution also has the same radial upward tilting tendency as the inner wall 132. The distance between the end of the magnetic strip 230 closest to the inner wall 132 and the electromagnetic heating element 220 is smaller than the distance between its other end and the electromagnetic heating element 220.
[0040] It should be noted that the radial and axial directions mentioned in this article refer to the guide ring 130, that is, the radial and axial directions of the guide ring 130.
[0041] The tire mold body 100 of the above-mentioned electrically heated tire mold basically follows the existing steam-heated tire mold. Based on the existing steam-heated tire mold guide ring 130 structure, its chamber 131 is modified. Assembly windows 134 are processed on the outer wall of the chamber 131. The uncut portion between two adjacent assembly windows 134 forms a support plate 133. The assembly windows 134 expose the inner wall 132 of the chamber 131 to the outside. The electromagnetic heating element 220 is laid on the inner wall of the chamber 131. The workload of the electric heating modification of the steam-heated mold is small.
[0042] The electromagnetic heating element 220 is directly mounted on the inner wall surface 132, which can achieve an ideal electromagnetic heating effect, with uniform heating temperature distribution and higher heating efficiency. Figure 2As shown, the electromagnetic heating element 220 is arranged in accordance with the trend of the inner wall surface 132. The lower end of the inner wall surface 132 gradually tilts outward radially, and the electromagnetic heating element 220 also gradually moves away from the tread block 110. That is, the heat transfer distance between the electromagnetic heating element 220 and the tread block 110 increases from L1 to L2 from top to bottom, and the heat transfer distance becomes longer. At the same time, the distance between the electromagnetic heating element 220 and the magnetic strip 230 gradually decreases. The smaller the distance between the electromagnetic heating element 220 and the magnetic strip 230, the better the magnetic conduction effect and the higher the heating temperature. This makes up for the influence of the change in heat transfer distance on the heating temperature of the tread block 110. In this way, a uniform temperature effect is achieved on the entire tread block 110, which is beneficial to control the tire vulcanization temperature and improve the vulcanization quality.
[0043] The support plate 133 and the guide ring 130 are designed as a single unit. The assembly window 134 is directly cut into the outer wall of the guide ring 130, and the uncut portion forms the support plate 133. No welding or other assembly processes are required, thus avoiding secondary welding that could affect the precision of the guide ring 130. It is understood that in other embodiments, the support plate 133 and the guide ring 130 can also be separate structures. After machining the assembly window 134 on the guide ring 130, the upper and lower ends of the support plate 133 are then fixedly connected to the upper and lower sidewalls of the assembly window 134 respectively by welding or other methods.
[0044] The number of assembly windows 134 can be set multiple times according to actual needs; similarly, multiple support plates 133 are provided, and several support plates 133 are evenly distributed along the outer periphery of the guide ring 130, resulting in high structural strength of the guide ring 130. Preferably, the number of support plates 133 is 6-10.
[0045] The electromagnetic heating elements 220 are distributed and arranged circumferentially around the guide ring 130. For example, the electromagnetic heating elements 220 can be configured as one or more coil groups surrounding the guide ring 130, and the plurality of coil groups are evenly distributed along the axial direction of the guide ring 130, such as... Figure 2-5 As shown; or, the electromagnetic heating element 220 includes several sets of disc-shaped coil groups, which are evenly distributed around the circumference of the guide ring 130. Whether the coil groups are surrounding the guide ring 130 or are disc-shaped, the winding scheme of the coil groups is prior art and will not be described in detail here.
[0046] The coils within the coil group are fixed by wire guide combs 210. Multiple wire guide combs 210 are provided as needed, arranged circumferentially. The wire guide combs 210 are fixed to the inner wall 132 of the chamber 131, and U-shaped slots are machined on the side of the wire guide comb 210 away from the inner wall 132, with the slots arranged axially. The coil of the electromagnetic heating element 220 is wound within the slot of the wire guide comb 210. For coil groups surrounding the guide ring 130, the coils are wound within the slots of different wire guide combs 210 corresponding to their axial positions. The coils within each coil group are spirally wound on the inner wall 132, and adjacent coil groups in the axial direction do not overlap or share slots. For a disc-shaped coil group, the circumferentially distributed wire combs form several wire comb groups. Each wire comb group includes two or more adjacent wire combs 210. Adjacent wire comb groups do not share wire combs 210. One coil group corresponds to one wire comb group. The coils in the same coil group are wound on at least two wire combs 210 of the corresponding wire comb group. The coils are wound sequentially from the inside out (from the middle of the length direction of the wire comb 210 to both ends). The coil group is disc-shaped such as oblong or rectangular. Adjacent coil groups do not share wire combs 210.
[0047] The cable comb 210 is made of non-magnetic metal materials such as aluminum. The cable comb 210 and the support plate 133 are spaced apart and staggered in the circumferential direction to avoid the support plate 133 obstructing the installation of the cable comb 210.
[0048] Multiple magnetic strips 230 are evenly distributed around the circumference of the guide ring 130. The upper and / or lower sidewalls of the assembly window 134 are respectively provided with slots 135, and the ends of the magnetic strips 230 are embedded in the slots 135. Preferably, both ends of the magnetic strips 230 are embedded in the upper and lower sidewalls of the assembly window 134, which can provide partial support and prevent deformation of the guide ring 130.
[0049] The slot 135 extends radially inward from the outer side of the guide ring 130, preferably without penetrating the outer wall of the chamber 131, that is, an inner limiting wall is formed on the radial inner side of the slot 135, thereby limiting the distance between the magnetic strip 230 and the electromagnetic heating element 220, so as to facilitate the adjustment of the distance between the magnetic strip 230 and the electromagnetic heating element 220.
[0050] Furthermore, a gasket is provided between the magnetic strip 230 and the inner limiting wall of the slot 135, and the distance between the magnetic strip 230 and the electromagnetic heating element 220 is controlled by adjusting the thickness of the gasket.
[0051] Furthermore, a cover layer 240 is provided on the outer peripheral surface of the guide ring 130. The cover layer 240 is made of aluminum plate or other non-magnetic metal materials, which can not only prevent dust, water, and impact, but also prevent the electromagnetic heating element 220 from electromagnetically heating the cover layer 240, thus preventing energy loss.
[0052] The outer radial side of the covering layer 240 is designed with an insulation sleeve 250 to prevent heat loss, save heat, and reduce energy consumption. The insulation sleeve 250 can be a single-layer or multi-layer insulation structure. The insulation sleeve 250 has an electromagnetic isolation layer to prevent electromagnetic diffusion. The electromagnetic isolation layer can be set in the inner or outer layer of the insulation sleeve 250 as needed. The electromagnetic isolation layer is made of magnetically conductive metal material, such as carbon steel, to prevent electromagnetic diffusion.
[0053] A temperature sensing element 260 is provided on the guide ring 130. The temperature sensing element 260 can be a thermocouple or a resistance temperature detector (RTD) to detect the temperature of the guide ring 130 and transmit the signal to the PLC to control whether heating continues. For example, the temperature sensing element 260 is a thermocouple, which extends from the insulation sleeve 250 into the guide ring 130 and is located near the inner side of the guide ring 130. The number of temperature sensing elements 260 can be selected as needed. One or more temperature sensing elements 260 can be evenly distributed circumferentially to detect the circumferential temperature uniformity of the guide ring 130, while multiple temperature sensing elements 260 can be evenly distributed axially to detect the axial temperature uniformity of the guide ring 130.
[0054] In areas where the overall structural strength requirements of the electrically heated tire mold are low, non-metallic screws are used to prevent ineffective heating. Specifically, the covering layer 240 and the insulation sleeve 250 are fixed to the guide ring 130 using non-metallic screws.
[0055] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. An electrically heated tire mold, comprising a tire mold body (100) and an electromagnetic heating device (200); the tire mold body (100) includes a guide ring (130), an arched seat (120), and a tread block (110), wherein the inner side of the guide ring (130) is slidably engaged with the arched seat (120) to realize the opening and closing of the tread block (110); the guide ring (130) is provided with an annular cavity (131) for heating the tread block (110); the inner wall (132) of the cavity (131) has the same inclination trend as the inner side of the guide ring (130); characterized in that, The outer wall of the chamber (131) is provided with a plurality of assembly windows (134), which penetrate the outer wall of the chamber (131) radially; the plurality of assembly windows (134) are distributed at intervals in the circumferential direction of the guide ring (130), and a support plate (133) is formed between two adjacent assembly windows (134). The electromagnetic heating device (200) includes an electromagnetic heating element (220) and a magnetic strip (230); the electromagnetic heating element (220) is evenly arranged on the inner wall (132); the magnetic strip (230) is fixedly installed on the radially outer side of the electromagnetic heating element (220) and extends axially on the guide ring (130).
2. The electrically heated tire mold according to claim 1, characterized in that, The outer circumferential surface of the guide ring (130) is provided with a cover layer (240), and the cover layer (240) is made of a non-magnetic metal material.
3. The electrically heated tire mold according to claim 2, characterized in that, The guide ring (130) is provided with a heat insulation sleeve (250) on its radial outer side, and the heat insulation sleeve (250) has an electromagnetic isolation layer.
4. The electrically heated tire mold according to claim 1, characterized in that, The guide ring (130) is provided with a plurality of temperature sensing elements (260); And / or, the number of the support plates (133) is 6-10.
5. The electrically heated tire mold according to claim 1, characterized in that, The electromagnetic heating element (220) includes several groups of coils surrounding the guide ring (130), and the several groups of coils are evenly distributed along the axial direction of the guide ring (130). Alternatively, the electromagnetic heating element (220) may include several sets of disc-shaped coils, which are evenly distributed around the guide ring (130).
6. The electrically heated tire mold according to claim 5, characterized in that, The coil of the electromagnetic heating element (220) is fixed on the inner wall (132) by a wire comb (210); there are multiple wire combs (210), and the multiple wire combs (210) are arranged circumferentially along the inner wall (132).
7. An electrically heated tire mold according to claim 6, characterized in that, The wire comb (210) is fixed to the inner wall (132), and a number of slots are processed on the side away from the inner wall (132). The slots are arranged along the axial direction of the guide ring (130). The coil of the electromagnetic heating element (220) is wound in the slot. And / or, the comb (210) is made of a non-magnetic metal material.
8. The electrically heated tire mold according to claim 1, characterized in that, The assembly window (134) has a slot (135) on its upper and / or lower sidewalls, and the end of the magnetic strip (230) is embedded in the slot (135).
9. An electrically heated tire mold according to claim 8, characterized in that, The slot (135) extends radially inward from the outer side of the guide ring (130), without penetrating the outer wall of the chamber (131), and forms an inner limiting wall on the radial inner side of the slot (135).
10. An electrically heated tire mold according to claim 9, characterized in that, A gasket is provided between the magnetic strip (230) and the inner limiting wall of the slot (135).