Electromagnetic heating plate for vulcanizing machine

Abstract

The utility model discloses an electromagnetic heating plate for a vulcanizing machine, and particularly relates to an electromagnetic heating plate for a tire vulcanizing machine, which comprises an upper plate and a lower plate, inner holes are formed in the centers of the upper plate and the lower plate, one surfaces, far away from each other, of the upper plate and the lower plate are circumferentially sunken to form mounting areas, and a plurality of separating strips are circumferentially and uniformly arranged in the mounting areas in a protruding manner. The installation area is divided into a plurality of installation cavities by the separation strips, coils are wound around the bottoms of the installation cavities, the winding directions of the coils in all the installation cavities are kept consistent, a plurality of high-permeability magnetic sheets or weak-permeability metal shielding sheets can be attached to the surfaces of the coils, and the sides, close to / away from the bottoms of the installation cavities, of the coils are covered with heat insulation plates. The whole installation area is further covered with a whole weak magnetic conductive metal shielding plate. According to the technical scheme, the heating effect is optimized, heat generated by the heating plate is distributed more evenly, and electromagnetic radiation leakage is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electromagnetic heating plate, especially relates to a vulcanizing machine electromagnetic heating plate. BACKGROUND

[0002] Tire vulcanization is a key process in tire manufacturing, and the tire vulcanizing machine is used to convert raw rubber into vulcanized rubber with elasticity and strength through chemical cross-linking reaction. In this process, the heating plate of the tire vulcanizing machine needs to generate heat to make the reaction temperature reach 140-180℃. The existing heating plate is mostly heated by passing high-temperature steam into the internal pipeline. There are several shortcomings: 1. Because the steam gradually releases heat during pipeline circulation, the temperature gradually decreases. The temperature of the heating plate surface is higher near the air inlet and lower near the air outlet, resulting in uneven heat distribution on the entire heating plate surface, which affects the final vulcanization effect. 2. The steam pipeline is too long, resulting in a large amount of heat loss and waste of energy. 3. Steam is a high-temperature and high-pressure product, which may leak and cause burns, posing a risk to personal safety.

[0003] Currently, there are some heating plates on the market that use electromagnetic heating. Because the electromagnetic heating plate has electromagnetic field distribution on both sides, and the workpiece to be heated is placed on one side of the heating plate, it is necessary to effectively shield the electromagnetic radiation on the non-workpiece side to improve the heating efficiency. The electromagnetic heating plates on the market increase a large number of magnetic conductive sheets (strips) on the non-workpiece side of the coil to absorb the electromagnetic field and achieve shielding effect. However, because the magnetic conductive sheets are spliced together, there are many gaps, resulting in a large amount of magnetic field leakage, which reduces the efficiency of electric heating conversion and also causes electromagnetic radiation. SUMMARY

[0004] The main purpose of the utility model is to provide a vulcanizing machine electromagnetic heating plate, which aims to optimize the heating effect and make the heat distribution of the heating plate more uniform.

[0005] To achieve the above purpose, the utility model provides a vulcanizing machine electromagnetic heating plate, which comprises:

[0006] The upper plate and the lower plate are provided with an inner hole at the center, and the side away from each other is recessed to form an installation area. A plurality of partition strips are uniformly protruded inside the installation area. The installation area is divided into a plurality of installation cavities. The coil is arranged at the bottom of the installation cavity, and the winding direction of the coil in each installation cavity is consistent. A plurality of high-permeability sheets or low-permeability metal shielding sheets can be attached to the surface of the coil. The side of the coil close to / distance from the bottom of the installation cavity is covered with a heat insulation plate. The entire installation area is also covered with a low-permeability metal shielding plate.

[0007] In a possible implementation, the inner space of the mounting cavity is provided with a plurality of load-bearing convex beams, and the plurality of load-bearing convex beams are distributed in a ring shape, and a fixing hole is formed in any of the load-bearing convex beams.

[0008] In a possible implementation, the surface of the heat insulation plate is provided with a gap corresponding to the load-bearing convex beam.

[0009] In a possible implementation, the surface of the partition strip or the load-bearing convex beam of the upper plate is provided with a mounting hole.

[0010] In a possible implementation, the partition strip is provided with a wiring port at an end away from the inner hole.

[0011] In a possible implementation, the lower plate is provided with a clamping groove on a side facing the upper plate.

[0012] The technical scheme of the utility model is used for a vulcanizing machine, and rapid and uniform temperature control is realized through electromagnetic heating, which is more efficient, energy-saving and uniform than traditional steam heating; the number of turns of the coil in the mounting cavity can be increased or reduced according to the required temperature, flexible temperature control is realized, meanwhile, the number of turns of the coil in each mounting cavity can be adjusted individually, local temperature adjustment is realized, the temperature control flexibility of the equipment is increased; the double design of heat insulation and insulation takes into account performance and safety; the magnetically conductive sheet and the weakly magnetically conductive metal sheet are selectively attached to the lower or higher temperature area of the coil in the local area, the magnetic field of the area can be increased or weakened, and then the temperature of the part is increased or reduced, so that more accurate temperature control effect is achieved; a weakly magnetically conductive metal plate is added to the outermost side, electromagnetic radiation can be effectively shielded, the weakly magnetically conductive material generates little heat, the coil is protected from being in a high-temperature sandwiched layer, and the service life of the coil is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained from the structure shown in the drawings without creative labor.

[0014] Figure 1 It is a structure diagram of an embodiment of the utility model vulcanizing machine electromagnetic heating plate;

[0015] Figure 2 It is an exploded view of an embodiment of the utility model upper plate;

[0016] Figure 3 It is a schematic diagram of the internal structure of an embodiment of the utility model upper plate;

[0017] Figure 4 It is the internal structure schematic view of another embodiment of the upper plate of the utility model;

[0018] Figure 5 It is the internal structure schematic view of still another embodiment of the upper plate of the utility model.

[0019] Explanation of reference numerals:

[0020] 1, upper plate; 2, lower plate; 21, clamping groove; 3, inner hole; 4, partition strip; 41, mounting hole; 42, wiring port; 5, mounting cavity; 6, coil; 61, magnetic sheet; 7, heat insulation board; 71, accommodation notch; 8, weak magnetic metal shielding plate; 9, bearing convex beam; 91, fixing hole.

[0021] The utility model discloses the realization, functional characteristics and advantages will be further explained with reference to the drawings. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantage of the present application more clear, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described here are only used to explain the present application and not to limit the present application.

[0023] Reference Figures 1 to 3 The utility model discloses an electromagnetic heating plate for vulcanizing machine, including upper plate and lower plate, the center of upper plate and lower plate all is set up with inner hole, the side of upper plate and lower plate away from each other all periphery recess forms has installation area, and the inside periphery of installation area all uniformly convex has a plurality of partition strips, and the installation area is divided into a plurality of installation cavities by partition strip, and the coil is set up around the bottom of installation cavity, and the coil in every installation cavity is kept consistent, and the coil surface can be pasted with a plurality of high magnetic sheet or weak magnetic metal shielding sheet, and the side of coil close to / away from the bottom of installation cavity is covered with heat insulation board, and the whole installation area is also covered with whole weak magnetic metal shielding plate.

[0024] It can be understood that the electromagnetic heating plate is composed of the symmetrical upper and lower two plates, and the center is provided with an inner hole 3 corresponding to the center hole of the tire. The outer side of the two plates opposite to each other has an annular recessed area, which is used for arranging the heating element. The installation area is uniformly convex with a plurality of partition strips 4, which divides the annular area into a plurality of independent installation cavities 5, similar to sector structure. The number of partition strips 4 can be arranged according to actual production demand. In this example, four partition strips are provided, which divide the installation area into four installation cavities 5.

[0025] The bottom of each installation cavity 5 is wound with a coil 6, which is the core component of electromagnetic heating. After the coil is connected to a high-frequency power supply, it generates an alternating electromagnetic field, and the heating plate generates heat. The coils 6 in all installation cavities 5 are wound in the same direction to ensure that the magnetic field direction is consistent and avoids cancellation. The two sides of the coil 6, i.e., the side close to the bottom of the installation cavity 5 and the side away from it, can be covered with a heat-insulating insulating plate 7. The heat-insulating insulating plate 7 can be a mica sheet or other high-temperature insulating material. The mica sheet has very high resistivity and dielectric strength, making it an excellent insulating material that ensures electrical safety. At the same time, natural mica sheets can withstand high temperatures of 500-600°C, and their low thermal conductivity allows for uniform heat dissipation, making them very suitable as high-temperature insulating materials in this example. In addition, the heat-insulating insulating plate also serves to fix and limit the coil, preventing it from shifting. A layer of weakly magnetic or non-magnetic metal plate can be added to the outermost side of the installation area, which can be an aluminum plate, a copper plate, an austenitic weakly magnetic stainless steel plate, or other weakly magnetic or non-magnetic materials. This can effectively shield electromagnetic radiation, and weakly magnetic materials generate less heat, protecting the coil from being in a high-temperature sandwich and prolonging the life of the coil.

[0026] The coil is also covered with a high-permeability sheet 61 or a weakly magnetic metal shielding sheet on the top and bottom. The magnetic permeability of the metal mainly depends on its internal electronic structure and magnetic characteristics. Under normal circumstances, metals have magnetic permeability, and weakly magnetic metals do not produce significant magnetization effects in a magnetic field, including copper, silver, gold, aluminum, and other metals. In contrast, high-permeability sheets are made of ferrite materials. The high-permeability sheet used in this example can be made of ferrite, and the weakly magnetic metal shielding sheet and the entire metal shielding plate can be made of commonly used metals such as aluminum, copper, and austenitic stainless steel. Precious metals increase production costs. The weakly magnetic metal shielding sheet used in this example is selectively attached to the bottom of the coil 6 in the area where the temperature is relatively high, which can weaken the magnetic field in that area and thus reduce the temperature in that part. Conversely, the high-permeability metal shielding sheet made of high-permeability material is selectively attached to the upper part of the coil 6 in the area where the temperature is relatively low, which can strengthen the magnetic field in that area and thus increase the temperature in that part, achieving more precise temperature control.

[0027] In this example, since there are multiple mounting holes on the partition strip, in order to avoid the hole position, it is inconvenient to make the whole heating plate into a circumferential winding, and the installation area is divided into four fan-shaped installation cavities, and the coils are also respectively fan-shaped wound in each installation cavity. The radially distributed partition strip is conducive to bearing, and also solves the trouble of avoiding multiple dense mounting holes for the circumferential coil. At the same time, multiple fans are more convenient to adjust the number of turns of the coil in the region. In the actual production and application process, notches can be left at both ends of the partition strip, thereby leaving a channel for the cross-fan area jumper of the electromagnetic wire in different fan-shaped areas of the heating plate. The notch and the bottom of the coil cavity are in the same plane. Since the hole position of the partition strip is often distributed in the middle section position, there is no hole position on the outer edge or the inner edge, so there is no need to avoid it. In this way, the notch width of the outer edge or the inner edge of the partition strip of the heating plate can be increased. The coils at the inner and outer notches continue to be wound in the form of a circumferential heating plate, and the middle part of the heating plate is divided into fans and wound with coils in the region (as shown in Figure 4 Further, if there are no holes or few holes on the partition strip, the partition strip can also be directly cancelled, or only the mounting hole protruding part is retained, and the bearing protruding beam is correspondingly changed into a plurality of concentric circular rings or a plurality of concentric circular arc segments. The whole coil is wound in the form of a circle. In addition, the heating plate can be made into other shapes such as a rectangle except for the circular ring in the tire industry, which is used for heating the workpiece of the vulcanizing machine except for the tire industry. The coil winding direction will be adaptively adjusted according to the shape of the heating plate (as shown in Figure 5 ).

[0028] The embodiment is used for a rubber vulcanizing machine, and rapid and uniform temperature control is realized through electromagnetic heating. Compared with traditional steam heating, the electromagnetic heating is more efficient, energy-saving and uniform; the number of turns of the coil 6 in the installation cavity 5 can be increased or reduced according to the required temperature, so that flexible temperature control is realized, and the number of turns of the coil 6 in each installation cavity 5 is adjusted separately, or the magnetically conductive sheet and the shielding sheet covering the surface of the coil are changed, so that local temperature adjustment is realized, and the temperature control flexibility of the equipment is increased; the double design of heat insulation and insulation takes into account performance and safety.

[0029] Referring to Figures 1 to 3 In an embodiment of the utility model, a plurality of bearing protruding beams 9 are arranged in the installation cavity 5, and the plurality of bearing protruding beams 9 are distributed in a ring shape. The bearing protruding beam 9 near the outer edge of the heating plate is provided with a fixing hole 91.

[0030] It can be understood that the plurality of load-bearing protruding beams 9 protruding in the installation cavity 5 can prevent the coil 6 from being displaced and fix the heat insulation plates 7 to prevent them from being displaced and affecting the arrangement of the coil 6. The load-bearing protruding beams can be designed according to the actual load-bearing capacity of the curing machine and the hole position, and the fixing hole does not necessarily need to be opened on the outermost protruding beam, but a suitable protruding part can be left at the hole position. According to the load-bearing size, other load-bearing protruding beams can be additionally provided to make the entire heating plate bear the pressure of the machine table uniformly and not easily deformed by pressure.

[0031] It should be noted that in this example, the load-bearing protruding beams 9 and the partition strips 4 are integrally formed with the upper plate 1 or the lower plate 2, rather than being welded, threadedly connected, etc., which has higher structural strength and stronger overall load-bearing capacity and is not prone to deformation.

[0032] Referring to Figures 1 to 2 In an embodiment of the present application, the heat insulation plate 7 has a displacement gap 71 corresponding to the load-bearing protruding beam 9.

[0033] It can be understood that the displacement gap 71 provided on the heat insulation plate 7 is used to avoid the load-bearing protruding beam 9 in the installation cavity 5, to ensure that the plate can be closely attached to the coil 6 and not compress the structure of the load-bearing protruding beam 9. The position, shape and number of the displacement gap 71 are completely matched with the distribution of the load-bearing protruding beam 9 to achieve accurate alignment. Meanwhile, the load-bearing protruding beam 9 also fixes and limits the plate to prevent it from being displaced.

[0034] Referring to Figures 1 to 3 In an embodiment of the present application, the surface of the partition strip 4 of the upper plate 1 or the load-bearing protruding beam 9 has an installation hole 41.

[0035] It can be understood that the installation hole 41 is provided on the top surface of the partition strip 4 of the upper plate and is used to fix the mold of the vulcanized tire. The inner hole 3 is matched with a pin or a bolt to realize quick alignment and fixation. The number of the installation hole 41 can be set according to actual use requirements, which is not limited herein. The hole column connection has a simple and effective fixation mode and saves installation time. The partition strip of the lower plate does not have a hole position, and the upper and lower heating plates of the small tire curing machine generally do not have a hole position. In this embodiment, only a product of a certain specification is drawn as a representative, and the number and specific position distribution of the heating plate installation holes are subject to the actual design of the curing machine manufacturer.

[0036] Referring to Figures 1 to 3 In an embodiment of the present application, the partition strip 4 has a wiring port 42 at an end away from the inner hole 3.

[0037] It can be understood that the wiring port 42 is arranged at the end of the partition strip 4 away from the inner hole 3, that is, close to the outer edge of the heating plate. The end of the partition strip 4 of each mounting cavity 5 has a wiring port 42, which can be a groove, a notch or a perforation structure, used to guide the wire of the coil 6 from one mounting cavity 5 to the adjacent mounting cavity 5, so that one wire can wind all the coils 6 in the mounting cavities 5. The coils 6 in each mounting cavity 5 are connected in series, and their voltage and current will be consistent when powered on, so that the heating is more uniform.

[0038] Referring to Figure 1 In an embodiment of the present application, the lower plate 2 is circumferentially provided with a clamping groove 21 on the side facing the upper plate 1.

[0039] It can be understood that the clamping groove 21 is arranged on the side of the lower plate 2 facing the upper plate 1, that is, the abutting surface of the upper and lower plates 2, and is arranged annularly along the edge of the lower plate 2 to form an intermittent groove structure. In this example, the clamping groove 21 is a T-shaped groove for embedding fasteners to fix the mold of the vulcanized tire. The mold can be directly placed on the lower plate 2 and fixed by limiting through the clamping groove 21, and the upper plate 1 is generally connected by bolts because it is usually suspended and hung for bearing.

[0040] The technical scheme of the present application is used for a rubber vulcanizing machine, which realizes rapid and uniform temperature control through electromagnetic heating, is more efficient, energy-saving and uniform compared with traditional steam heating; the number of turns of the coil 6 in the mounting cavity 5 can be increased or decreased according to the required temperature to realize flexible temperature control, and at the same time, the number of turns of the coil 6 in each mounting cavity 5 is adjusted individually, or the magnetic shielding sheet covering the surface of the coil is changed, which can realize local temperature adjustment and increase the flexibility of temperature control of the equipment; the double design of heat insulation and insulation takes into account the performance and safety; the weak magnetic shielding plate made of weak magnetic metal covers the outermost side of the coil of the heating plate, which can effectively shield the magnetic field leakage of the electromagnetic coil, so that the electromagnetic induction heating effect generated by the coil only acts on the heating plate body on the other side, thereby realizing energy saving, shielding electromagnetic radiation and interference; at the same time, the weak magnetic material generates little heat, protects the coil from being in a high-temperature sandwiched layer on both sides, and prolongs the service life of the coil.

[0041] In the drawings of the embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation of the present patent, and for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0042] The above merely provides preferred embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, and improvement made in the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electromagnetic heating plate for a vulcanizing machine, characterized in that, include: The upper plate (1) and the lower plate (2) are provided with an inner hole (3) in the center of each of the upper plate (1) and the lower plate (2). The side of the upper plate (1) and the lower plate (2) that are far apart from each other are circumferentially recessed to form an installation area. Multiple partition strips (4) are uniformly protruded circumferentially inside the installation area. The partition strips (4) divide the installation area into multiple installation cavities (5). A coil (6) is wound around the bottom of the installation cavity (5). The coil (6) in each installation cavity (5) is wound in the same direction. Multiple high magnetic permeability sheets or weak magnetic permeability metal shielding sheets (61) can be attached to the surface of the coil (6). The side of the coil (6) that is close to / far from the bottom of the installation cavity (5) is covered with a heat insulation plate (7). The entire installation area is also covered with a weak magnetic permeability metal shielding plate (8).

2. The electromagnetic heating plate for a vulcanizing machine according to claim 1, characterized in that, The mounting cavity (5) is provided with multiple load-bearing protrusions (9) at intervals, and the multiple load-bearing protrusions (9) are arranged in a ring. A fixing hole (91) can be opened on any of the load-bearing protrusions (9).

3. The electromagnetic heating plate for a vulcanizing machine according to claim 2, characterized in that, The surface of the heat insulation board (7) has a clearance notch (71) corresponding to the load-bearing convex beam (9).

4. The electromagnetic heating plate for a vulcanizing machine according to claim 3, characterized in that, The upper plate (1) has mounting holes (41) on its surface for the partition strip (4) or the load-bearing beam (9).

5. The electromagnetic heating plate for a vulcanizing machine according to claim 4, characterized in that, The separator (4) has a wiring port (42) at the end away from the inner hole (3).

6. The electromagnetic heating plate for a vulcanizing machine according to claim 5, characterized in that, The lower plate (2) has a snap-fit ​​groove (21) circumferentially formed on the side facing the upper plate (1).

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