Electromagnetic tire mold with a die sleeve

Abstract

The application relates to the technical field of tire molds, in particular to a mold cover electromagnetic heating tire mold which comprises a mold shell, heating plates are arranged at the upper and lower ends of the mold shell, a pattern ring is arranged in the mold shell, a plurality of side plates are uniformly and fixedly connected between the pattern ring and the mold shell, a plurality of grooves are uniformly formed in the mold shell, first fixing blocks and second fixing blocks are fixedly connected to the two sides of the inner wall of each groove, elastic components for adjusting the positions of coils are arranged in the grooves, the elastic components comprise symmetrical magnetic cores, the magnetic cores are located between the first fixing blocks and the second fixing blocks, first coils are arranged on the magnetic cores, and springs are fixedly connected between the first coils and the first fixing blocks and the second fixing blocks; monitoring components for monitoring temperature are arranged in the grooves. The symmetrical spring elastic fixing mode can effectively prevent the first coils from deviating and improve the uniformity of electromagnetic heating.

Description

Technical Field

[0001] This invention relates to the field of tire mold technology, and specifically to a tire mold with electromagnetic heating. Background Technology

[0002] Electromagnetic induction heating technology, as a novel heating technology, boasts advantages such as being pollution-free, energy-efficient, and highly efficient, representing a technological upgrade and transformation of electric heating. This technology primarily uses electrical energy to heat metal hot plates or molds. Compared to traditional steam heating, electromagnetic heating is more controllable. Existing electromagnetic heating vulcanization equipment, such as high-grade passenger radial tire hydraulic vulcanizing machines, utilizes electromagnetic heating devices installed within the inner metal mold during the vulcanization process. The upper and lower hot plates generate eddy currents within the workpiece through an alternating magnetic field produced by high-frequency alternating current, thereby achieving heating.

[0003] Existing tire electromagnetic heating mold equipment, such as the "electromagnetic heating vulcanizing machine manufactured by Sinochem Rubber Machinery Guilin Base," includes a main electromagnetic heating structure comprising a metal inner mold, upper and lower heating plates, an electromagnetic induction heating system, and a temperature measurement system. The electromagnetic induction heating area is divided into three parts, heating the upper heating plate, lower heating plate, and mold sleeve respectively. Several annular grooves are opened on the upper heating plate, lower heating plate, and mold sleeve heating cover, and several coils of electromagnetic coils are arranged in the grooves. Heat insulation plates are installed to prevent the coils from directly contacting the upper heating plate, lower heating plate, and mold sleeve. Traditionally, the coils are rigidly fixed by stainless steel cable ties or pressure plates. Due to the thermal expansion and contraction characteristics of metal, after repeated expansion and contraction, the rigid fixing method makes the coils easy to loosen, resulting in uneven coil spacing and reduced heating uniformity.

[0004] This invention provides a molded electromagnetic heating tire mold to solve the above-mentioned problems. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a mold sleeve electromagnetic heating tire mold, which uses an elastic fixing structure to prevent the coil from loosening.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A mold shell for electromagnetic heating of a tire includes a mold shell, heating plates at both the upper and lower ends of the mold shell, a tread ring inside the mold shell, and a plurality of side plates uniformly fixedly connected between the tread ring and the mold shell. A plurality of grooves are uniformly opened inside the mold shell, and a first fixing block and a second fixing block are respectively fixedly connected to both sides of the inner wall of the groove. An elastic component for adjusting the position of the coil is provided inside the groove. Each elastic component includes a symmetrical magnetic core, which is located between the first fixing block and the second fixing block. A first coil is sleeved on each magnetic core, and springs are fixedly connected to both ends of the first coil. The other end of the springs is fixedly connected to the corresponding first fixing block and the second fixing block. A monitoring component for monitoring the internal temperature of the mold is provided inside each groove.

[0007] The technical principles of the above solution are as follows: During operation, alternating current is passed into the first coil inside the groove, causing the patterned ring to heat up induction and achieve vulcanization heating. At the same time, the two ends of the first coil, which is sleeved on the magnetic core, are connected to the first and second fixing blocks respectively through springs. When the temperature rises, due to the thermal expansion and contraction characteristics of the metal material itself, the relative position between the inner wall of the groove and the first coil changes. When the relative position between the inner wall of the groove and the first coil changes, the springs deform. The springs on both sides of the first coil together generate radial pressure to prevent the first coil from shifting, thereby ensuring the stability and uniformity of the heating of the mold shell.

[0008] The above approach has the following beneficial effects: 1. In this solution, by setting up an elastic component, the spring can automatically extend and retract when the mold is heated and expands, so that the magnetic core and the first coil can adaptively and finely adjust their positions in the groove, avoiding changes in the distance between the coil and the heating area due to thermal deformation or mechanical gaps, thereby maintaining stable electromagnetic coupling efficiency and achieving uniform heating.

[0009] 2. In this design, two magnetic cores are symmetrically arranged in the groove, and a first coil is fitted on each magnetic core. Compared with the single magnetic core structure, it can generate a more concentrated and symmetrical alternating magnetic field, reduce magnetic leakage, improve the conversion efficiency of electromagnetic energy to heat energy, and reduce electromagnetic interference to surrounding components.

[0010] 3. In this solution, a monitoring component (such as a thermocouple) is installed inside the groove to detect the temperature of critical areas of the mold in real time. When the temperature is abnormal, the coil power can be adjusted in time or an alarm can be issued to avoid local overheating that could lead to a decrease in tire vulcanization quality or mold damage, thus extending the mold life.

[0011] Furthermore, each heating plate is equipped with a heat insulation plate.

[0012] Beneficial effects: It can effectively block the heat conducted from the heating plate to the lower shell, reduce heat loss, improve the thermal efficiency of the heating plate, and at the same time reduce the surface temperature of the mold shell, thus improving operational safety.

[0013] Furthermore, each heating plate is equipped with several second coils.

[0014] Beneficial effects: Several second coils are installed inside the heating plate, which can provide auxiliary electromagnetic heating to the upper and lower end faces of the tire mold, making up for the insufficient heating capacity of the first coil at the end, and achieving more three-dimensional and faster overall heating.

[0015] Furthermore, an insulation layer is provided inside the mold shell.

[0016] Beneficial effects: Significantly reduces heat loss from the mold, shortens preheating time, reduces energy consumption, maintains a stable temperature field during vulcanization, and improves the consistency of tire vulcanization quality.

[0017] Furthermore, the first fixing block has symmetrical connection ports. One end of the first coil enters the groove from one of the connection ports and is wound around the corresponding magnetic core, while the other end of the first coil extends out from the other connection port.

[0018] Beneficial effects: It facilitates the threading and fixing of the first coil, avoids damage from friction between the coil and the edge of the groove, and enables dual-wire entry and exit, which is conducive to the series or parallel wiring of multiple magnetic cores.

[0019] Furthermore, one end of the spring is fixedly connected to the corresponding first fixing block and second fixing block respectively, and the other end of the spring is fixedly connected to a pressure plate, which is symmetrically fixed to both ends of the first coil.

[0020] Beneficial effects: It can avoid the spring from directly contacting the coil wire, disperse the spring pressure, prevent local stress deformation of the coil or damage to the insulation layer, and improve the reliability and life of the coil.

[0021] Furthermore, insulating and heat-insulating pads are provided between the pressure plate and the first coil.

[0022] Beneficial effects: It can prevent the coil current from forming a short circuit through the pressure plate and block the heat conducted by the spring, avoiding the spring's elasticity decay due to high temperature and ensuring the long-term stability of the elastic component.

[0023] Furthermore, the sidewalls of the pressure plate are symmetrically provided with protrusions, and the outside of the spring is provided with guide grooves corresponding to the protrusions.

[0024] Beneficial effects: It keeps the pressure plate moving in a straight line during compression or reset, prevents the pressure plate from rotating or shifting and causing the coil to twist, and ensures that the spring force is applied evenly to the center area of ​​the coil.

[0025] Furthermore, each guide groove is equipped with several ball bearings.

[0026] Beneficial effects: It transforms the sliding friction between the pressure plate protrusion and the guide groove into rolling friction, significantly reducing motion resistance, making coil position adjustment more sensitive and smoother, avoiding jamming, and reducing wear.

[0027] Furthermore, the monitoring components all include thermocouple modules, and a controller is provided on the mold shell. The thermocouple modules and the first coil are electrically connected to the controller, and the thermocouple modules are fixedly connected to the inner wall of the groove.

[0028] Beneficial effects: Both the thermocouple and the coil are electrically connected to the controller. The controller can adjust the coil power or switch on / off in real time based on the temperature signal fed back by the thermocouple, achieving closed-loop precise temperature control and ensuring accurate execution of the vulcanization process curve. Attached Figure Description

[0029] Figure 1This is an isometric view of the electromagnetic heating tire mold of the present invention; Figure 2 This is a cross-sectional view of the electromagnetic heating tire mold of the present invention. Figure 3 Axonometric schematic diagram of the groove and coil sections; Figure 4 This is a cross-sectional view of the coil; Figure 5 for Figure 4 Enlarged view of part A in the middle.

[0030] The reference numerals in the accompanying drawings of the instruction manual include: 1. Mold shell; 2. Heating plate; 3. Patterned ring; 4. Side plate; 5. Groove; 6. Magnetic core; 7. First coil; 8. Spring; 9. Heat insulation plate; 10. Second coil; 11. Insulation layer; 12. Connection port; 13. Pressure plate; 14. Heat insulation pad; 15. Protrusion; 16. Guide groove; 17. Ball bearing; 18. Thermocouple module; 101. First fixing block; 102. Second fixing block. Detailed Implementation

[0031] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] The following detailed description illustrates the specific implementation method: Example 1:

[0035] As attached Figure 1 As shown: A type of electromagnetically heated tire mold includes a mold shell 1, with heating plates 2 at both the upper and lower ends of the mold shell 1. A tread pattern 3 is located inside the mold shell 1, and several side plates 4 are uniformly welded and fixed between the tread pattern 3 and the mold shell 1 (the mold shell 1, side plates 4, and tread pattern 3 are all made of metal). Several grooves 5 are uniformly formed inside the mold shell 1, such as... Figure 4 As shown, a first fixing block 101 and a second fixing block 102 are fixedly connected to both sides of the inner wall of the groove 5, respectively. Each groove 5 is provided with an elastic component for adjusting the position of the coil. Each elastic component includes a symmetrical magnetic core 6, which is located between the first fixing block 101 and the second fixing block 102. A first coil 7 is sleeved on each magnetic core 6 (the first coil 7 is connected to an external control system to control the first coil 7 to be energized). Springs 8 (preferably high-temperature resistant disc springs) are fixedly connected to both ends of the first coil 7, and the other end of the spring 8 is fixedly connected to the corresponding first fixing block 101 and second fixing block 102, respectively. Each groove 5 is provided with a monitoring component for monitoring the internal temperature of the mold. like Figure 2 As shown, each heating plate 2 is equipped with a heat insulation plate 9, and each heating plate 2 is equipped with a number of second coils 10 (the second coils 10 are energized separately from the first coils 7 and controlled by an independent control system. Since the thickness of the tire sidewall and the tire crown are different, to prevent excessive vulcanization due to excessive temperature, the above control system is designed with reference to the electromagnetic heating vulcanizing machine graded control system manufactured by Sinochem Rubber Machinery Guilin Base). The mold shell 1 is equipped with a heat insulation layer 11 on the outside.

[0036] The specific implementation process is as follows: Before the tire vulcanization, the tire blank is placed between the tread ring 3 and the upper and lower heating plates 2. At this time, the spring 8 is in a normal uncompressed state. When working, high-frequency alternating current is passed into the first coil 7. According to the principle of electromagnetic induction, the side wall of the mold shell 1, the side plate 4 and the tread ring 3 are rapidly heated. The heat passes through the tire blank to vulcanize the tire blank.

[0037] During this heating process, due to the thermal expansion and contraction characteristics of the metal material itself, the mold shell 1 expands in all directions after being heated, which increases the length of the groove 5. This forces the relative position between the inner wall of the groove 5 and the first coil 7 to change. When the length of the groove 5 increases, the first fixing block 101 and the second fixing block 102 move outward relative to the first coil 7, and the first fixing block 101 and the second fixing block 102 move away from each other, further stretching the spring 8. The springs 8 on both sides of the first coil 7 generate radial tension together. Under the joint tension of the springs 8 on both sides, the first coil 7 is dynamically located at the center of the groove 5. When the temperature decreases, the length of the groove 5 gradually recovers, the first fixing block 101 and the second fixing block 102 move closer to each other, and the springs 8 gradually return to their original position. During this process, the first coil 7 is dynamically located at the center of the groove 5. The relative position of the first coil 7 and the groove 5 is dynamically adjusted by the deformation of the spring 8. Compared with the traditional rigid fixing method, this effectively avoids damage to the first coil 7, and further enhances the stability of the first coil 7 fixed to the groove 5, making the electromagnetic heating of the first coil 7 more stable and uniform.

[0038] In addition, when the second coil 10 is heated, the heating plate 2 heats up and transfers heat to the upper and lower ends of the tire blank to ensure that the tire blank is heated evenly. The heat insulation plate 9 and the heat insulation layer 11 can reduce heat loss, force the heat to be transferred mainly inward, maintain the stability of the high temperature field inside the mold, and reduce power consumption.

[0039] This solution utilizes the adaptive movement of spring 8, relying on its own elastic deformation and recovery, to dynamically adjust the displacement caused by thermal expansion and contraction, while spring 8 continuously provides a centering constraint force. The dynamic adjustment of spring 8 ensures that the first coil 7 is always in the optimal electromagnetic heating position at the center of groove 5, significantly improving the temperature uniformity and process repeatability of tire vulcanization, and also extending the service life of the first coil 7.

[0040] Example 2:

[0041] As attached Figure 3 As shown, the difference from Embodiment 1 is that the first fixing block 101 has symmetrical connection ports 12. One end of the first coil 7 passes through the side wall of the groove 5 and extends into the groove 5 through one of the connection ports 12, and is wound around the symmetrical magnetic core 6 in sequence. The other end of the first coil 7 passes through another connection port 12 and extends to the outside of the groove 5.

[0042] like Figure 5As shown, one end of the spring 8 is welded and fixed to the corresponding first fixing block 101 and second fixing block 102 respectively. The other end of the spring 8 is welded and fixed with a pressure plate 13. The pressure plate 13 is symmetrically fixed to both ends of the first coil 7. An insulating and heat-insulating pad 14 is provided between the pressure plate 13 and the first coil 7. The side wall of the pressure plate 13 is symmetrically provided with protrusions 15. The outside of the spring 8 is provided with a guide groove 16 corresponding to the protrusion 15. A number of balls 17 are provided in the guide groove 16.

[0043] The specific implementation process is as follows: When high-frequency alternating current is applied to the first coil 7, the metal components such as the mold shell 1 and the patterned ring 3 rapidly heat up and undergo thermal expansion, causing a dynamic change in the relative position between the inner wall of the groove 5 and the first coil 7. As the inner wall of the groove 5 expands, the first coil 7 is subjected to compression from the inner wall of the groove 5, causing the spring 8 to deform and transmit pressure to the pressure plate 13. An insulating and heat-insulating gasket 14 is provided between the pressure plate 13 and the first coil 7 to block heat and ensure the stability of the spring 8.

[0044] When the spring 8 deforms, the protrusion 15 on the side wall of the pressure plate 13 slides in the guide groove 16. The ball 17 in the guide groove 16 converts the sliding friction into rolling friction, greatly reducing the movement resistance of the protrusion 15 in the guide groove 16. The other end of the pressure plate 13 is fixedly connected to the spring 8, and the other end of the spring 8 is fixedly connected to the first fixing block 101 and the second fixing block 102 respectively. When the protrusion 15 causes the pressure plate 13 to make a small displacement, the spring 8 is compressed or stretched. Since the springs 8 are symmetrically arranged on both sides of the first coil 7, they will jointly generate a radial resultant force pointing towards the center of the coil, thereby dynamically adjusting the clamping force of the pressure plate 13 on the coil and ensuring the uniformity of heating in all parts of the mold shell 1.

[0045] In addition, the cooperation between the ball bearing 17 and the guide groove 16 in this design makes the deformation response of the spring 8 more sensitive and rapid, while the insulating and heat-insulating pad 14 protects the spring 8 and the pressure plate 13 from the high temperature of the coil, ensuring that the entire adaptive adjustment mechanism continues to work reliably during the high-temperature vulcanization cycle.

[0046] Example 3:

[0047] As attached Figure 3 As shown, the difference from Embodiment 2 is that the monitoring components all include a thermocouple module 18, and a controller is provided on the mold shell 1. The thermocouple module 18 and the first coil 7 are both electrically connected to the controller. The thermocouple module 18 is welded and fixed to the inner wall of the groove 5. The preferred model of the thermocouple module is IC660BBS103, and the preferred model of the controller is MCUTI MSP430. In addition, in order to assist in controlling the power supply, the controller is also connected to a relay, which is electrically connected to the first coil 7. The preferred model of the relay is SSR.

[0048] The specific implementation process is as follows: During operation, the thermocouple module 18 monitors the temperature of the mold shell 1 in real time. When the temperature reaches the preset temperature, the thermocouple module 18 transmits the corresponding electrical signal to the controller. The controller receives and analyzes the signal, and then sends a power-off signal to the relay. The relay then cuts off the current circuit to the first coil 7, so that the electromagnetic heating stops, thereby avoiding uneven vulcanization quality or rubber aging caused by local overheating of the tire. Meanwhile, the thermocouple module 18 continues to sample the temperature in real time. If the temperature is detected to drop below the set start-up threshold, the controller will re-energize the relay to resume heating, and so on.

[0049] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A mold for electromagnetically heated tires, comprising a mold shell (1), characterized in that, Heating plates (2) are provided at both the top and bottom of the mold shell (1). A patterned ring (3) is provided inside the mold shell (1). Several side plates (4) are uniformly fixed between the patterned ring (3) and the mold shell (1). Several grooves (5) are uniformly opened inside the mold shell (1). A first fixing block (101) and a second fixing block (102) are fixedly connected to both sides of the inner wall of the groove (5). An elastic component for adjusting the position of the coil is provided inside the groove (5). The elastic component includes a symmetrical magnetic core (6). The magnetic core (6) is located between the first fixing block (101) and the second fixing block (102). A first coil (7) is sleeved on the magnetic core (6). A spring (8) is fixedly connected to both ends of the first coil (7). The other end of the spring (8) is fixedly connected to the corresponding first fixing block (101) and second fixing block (102). A monitoring component for monitoring the internal temperature of the mold is provided inside the groove (5).

2. The electromagnetic heating tire mold according to claim 1, characterized in that, Each heating plate (2) is equipped with a heat insulation plate (9).

3. The electromagnetic heating tire mold according to claim 2, characterized in that, Each heating plate (2) is equipped with several second coils (10).

4. The electromagnetic heating tire mold according to claim 3, characterized in that, The mold shell (1) has an insulation layer (11) inside.

5. The electromagnetic heating tire mold according to claim 4, characterized in that, The first fixing block (101) has symmetrical connection ports (12). One end of the first coil (7) passes through the side wall of the groove 5 and extends into the groove (5) through one of the connection ports (12) and is wound around the symmetrical magnetic core (6). The other end of the first coil (7) passes through another connection port (12) and extends to the outside of the groove (5).

6. The electromagnetic heating tire mold according to claim 5, characterized in that, One end of the spring (8) is fixedly connected to the corresponding first fixing block (101) and second fixing block (102), and the other end of the spring (8) is fixedly connected to the pressure plate (13). The pressure plate (13) is symmetrically fixed at both ends of the first coil (7).

7. The electromagnetic heating tire mold according to claim 6, characterized in that, Insulating and heat-insulating pads (14) are provided between the pressure plate (13) and the first coil (7).

8. The electromagnetic heating tire mold according to claim 7, characterized in that, The sidewalls of the pressure plate (13) are symmetrically provided with protrusions (15), and the springs (8) are provided with guide grooves (16) corresponding to the protrusions (15).

9. The electromagnetic heating tire mold according to claim 8, characterized in that, Each guide groove (16) is provided with a number of balls (17).

10. The electromagnetic heating tire mold according to claim 9, characterized in that, All monitoring components include thermocouple modules (18), and a controller is provided on the mold shell (1). The thermocouple modules (18) and the first coil (7) are electrically connected to the controller. The thermocouple modules (18) are fixedly connected to the inner wall of the groove (5).

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