Electromagnetic heating device

Abstract

The present invention relates to the field of mold heating technology. An electromagnetic heating device comprises a lower insulating plate, an upper insulating plate, a lower mold and an upper mold, wherein the lower mold is arranged on the upper surface of the lower insulating plate, the upper mold is arranged on the lower surface of the upper insulating plate, positioning columns are fixedly arranged on the left and right sides of the upper surface of the lower insulating plate, the upper insulating plate is slidingly arranged on the column walls of the two positioning columns, a heating groove is provided on the front side wall of the lower insulating plate and the upper insulating plate, an electromagnetic coil is arranged inside the heating groove, a sealing plate is arranged at the opening of the heating groove, and a clamping mechanism for fixing the electromagnetic coil is arranged on the sealing plate. The novel electromagnetic heating device can ensure that the heat generated by the electromagnetic coil heats the mold in a centralized and effective manner, and can replace electromagnetic coils of different sizes according to molds of different sizes, thereby ensuring the heating effect of the mold and improving the quality of the injection molded parts.

Description

Technical Field

[0001] The invention relates to the technical field of mold heating, in particular to an electromagnetic heating device. Background Art

[0002] Electromagnetic heating is more efficient and energy-saving than traditional conductive heating, and is gradually being used more and more in industries, construction, food, medicine, chemical industry, life and other fields. The present invention mainly relates to mold heating technology in the industrial field.

[0003] The existing electromagnetic mold heating device is to fix the upper mold and the lower mold on the upper mold base and the lower mold base respectively, and fix electromagnetic coils between the upper mold base and the upper mold, and between the lower mold base and the lower mold, respectively. The magnetic field generated by the electromagnetic coil makes the carriers of the upper mold and the lower mold made of metal material move irregularly at high speed, and the carriers and atoms collide and rub with each other to generate heat energy, thereby heating the molds in the upper mold and the lower mold. However, since the existing upper mold base and the lower mold base are also made of metal materials, they will also generate a certain amplitude of electromagnetic induction phenomenon and generate heat under the action of the magnetic field of the electromagnetic coil. This part of the heat is invalid, which will waste a lot of electric energy and make the production cost higher.

[0004] The mold only performs directional local induction heating on the mold surface through an open electromagnetic induction heating method. Local electromagnetic induction heating consumes less energy than overall electromagnetic induction heating to produce the same temperature. Therefore, a more suitable local mold heating device can save a lot of energy and reduce production costs in the process of using molds to produce workpieces.

[0005] When the existing electromagnetic induction heating method is used to heat the mold, the heat generated by the electromagnetic induction coil cannot be used to heat the mold, resulting in heat loss. In addition, since the molds of different sizes are replaced according to the shape of the required injection molded parts, a single electromagnetic heating coil cannot ensure effective heating of molds of different sizes, thereby reducing the heating effect of the mold, and ultimately causing the quality of the injection molded parts to decrease. To this end, the present invention proposes a new electromagnetic heating device. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In view of the deficiencies in the prior art, the present invention provides an electromagnetic heating device, which can ensure that the heat generated by the electromagnetic coil can centrally and effectively heat the mold, avoiding heat waste, and can replace electromagnetic coils of different sizes according to molds of different sizes, thereby ensuring the heating effect of the mold and improving the quality of the injection molded parts, solving the problem of poor heating effect of the mold using the current electromagnetic induction heating method, which causes heat loss.

[0008] (II) Technical solution

[0009] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an electromagnetic heating device, comprising a lower fixed seat and an upper fixed seat, and a lower mold and an upper mold respectively fixed to the surfaces of the lower fixed seat and the upper fixed seat, the lower fixed seat is a lower insulating plate, the upper fixed seat is an upper insulating plate, the lower mold is arranged on the upper surface of the lower insulating plate, the upper mold is arranged on the lower surface of the upper insulating plate, positioning columns are fixed on both sides of the upper surface of the lower insulating plate, the upper insulating plate is slidably arranged on the column walls of the two positioning columns, the lower insulating plate and the upper insulating plate are respectively encapsulated and fixed with electromagnetic coils, the two ends of the electromagnetic coil respectively pass through the lower insulating plate and the upper insulating plate, and are connected to the control board.

[0010] The present invention further provides an electromagnetic heating device, comprising a lower fixed seat and an upper fixed seat, and a lower mold and an upper mold respectively fixed to the surfaces of the lower fixed seat and the upper fixed seat, the lower fixed seat being a lower insulating plate, the upper fixed seat being an upper insulating plate, the lower mold being arranged on the upper surface of the lower insulating plate, the upper mold being arranged on the lower surface of the upper insulating plate, positioning columns being fixedly arranged on the left and right sides of the upper surface of the lower insulating plate, the upper insulating plate being slidably arranged on the column walls of the two positioning columns, a heating groove being provided on the front side walls of the lower insulating plate and the upper insulating plate, an electromagnetic coil being arranged inside the heating groove, a sealing plate being arranged at the opening of the heating groove, a clamping mechanism being arranged on the sealing plate for fixing the electromagnetic coil, and a limiting mechanism being arranged on the front side walls of the lower insulating plate and the upper insulating plate and on the left and right sides of the heating groove for pressing the sealing plate.

[0011] Preferably, the clamping mechanism includes a bidirectional screw, a moving block, a connecting rod, a first arc clamping plate, a first bevel gear, a second bevel gear and a rotating shaft, the sealing plate is a hollow structure, the bidirectional screw is laterally located inside the sealing plate, the left and right inner walls of the sealing plate are both embedded with a first rolling bearing, both ends of the bidirectional screw are rotatably connected to the left and right inner walls of the sealing plate through the first rolling bearing, the moving block is symmetrically located inside the sealing plate and the side wall is slidably connected to the inner wall of the sealing plate, the side walls of the two moving blocks are threadedly connected to the rod wall of the bidirectional screw through the first threaded hole and the second threaded hole respectively, and the connecting rod They are respectively fixed on the upper sides of the two moving blocks, and a strip hole is opened on the upper side of the sealing plate for the two connecting rods to pass through. The first arc clamping plates are respectively fixed on one end of the two connecting rods located outside the sealing plate and are symmetrically arranged. The electromagnetic coil is located between the two first arc clamping plates. The first bevel gear is fixed on the middle part of the rod wall of the two-way screw rod. The rotating shaft is vertically located below the two-way screw rod and the lower end is rotatably connected to the lower side of the sealing plate through a second rolling bearing and a crank handle is fixedly provided. The upper end of the rotating shaft is fixedly connected to the second bevel gear, and the first bevel gear and the second bevel gear are meshingly arranged.

[0012] Preferably, the clamping mechanism includes a fixed seat, a sleeve, a movable rod, a spring and a second arc-shaped clamping plate, the fixed seat is fixedly arranged on the upper side of the sealing plate, the sleeve is fixedly arranged on the upper side of the sealing plate in a left-right symmetrical manner and is respectively located on both sides of the fixed seat, the movable rods are respectively slidably arranged inside the two sleeves, the lower ends of the two movable rods are respectively fixedly connected to the upper ends of the springs, the lower ends of the two springs are respectively fixedly connected to the inner walls of the two sleeves, the upper ends of the two movable rods both extend to the outside of the corresponding sleeves and are both fixedly connected to the second arc-shaped clamping plate, and the electromagnetic coil is located between the fixed seat and the second arc-shaped clamping plate.

[0013] Preferably, the limiting mechanism includes a one-way screw, a clamping plate and a threaded ring, the one-way screw is fixedly arranged on the front side walls of the lower insulating plate and the upper insulating plate respectively, the surface of the clamping plate is inserted into the rod wall of the one-way screw through a socket, and the threaded ring is threadedly connected to the rod wall of the one-way screw and fastens the clamping plate and the upper insulating plate.

[0014] Preferably, a manual ring is fixedly provided on a side of the threaded ring away from the clamping plate, and the manual ring is movably sleeved with the rod wall of the one-way screw.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the electromagnetic heating device of the present invention has the following beneficial effects:

[0017] 1. The present invention replaces the existing upper and lower fixing seats made of metal with insulating plates, and embeds the heating coil structure inside the insulating plate, thereby avoiding the energy loss caused by the synchronous heating of the existing fixing seats, making the heating effect more concentrated and efficient, effectively saving energy consumption and reducing the production cost of the enterprise.

[0018] 2. The novel electromagnetic heating device can clamp and fix electromagnetic coils of different sizes by means of a bidirectional screw, a moving block, a connecting rod, a first bevel gear, a rotating shaft, a second bevel gear, a crank handle and a first arc-shaped clamping plate arranged on a sealing plate.

[0019] 3. The new electromagnetic heating device can clamp and fix electromagnetic coils of different sizes by means of a sleeve, a moving rod, a spring and a second arc-shaped clamping plate arranged on a sealing plate.

[0020] 4. The new electromagnetic heating device can press and fix the sealing plate inside the heating groove by means of a one-way screw, a clamping plate, a threaded ring and a manual ring arranged on the front side wall of the upper insulating plate and on both sides of the heating groove, thereby increasing the fixing effect of the electromagnetic coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural schematic diagram of a first embodiment of a novel electromagnetic heating device proposed by the present invention;

[0022] Figure 2 for Figure 1 Cross-sectional structural diagram;

[0023] Figure 3 This is a structural schematic diagram of a second embodiment of a novel electromagnetic heating device proposed by the present invention;

[0024] Figure 4 for Figure 1 Cross-sectional structural diagram;

[0025] Figure 5 A schematic top view of the structure of an embodiment of the connection between the electromagnetic coil and the sealing plate proposed in the present invention;

[0026] Figure 6 It is a top view of another embodiment of the connection between the electromagnetic coil and the sealing plate proposed in the present invention;

[0027] Figure 7 for Figure 3 Schematic diagram of the structure of the limiting mechanism for fixing the sealing plate.

[0028] In the figure: 1 lower insulating plate, 2 lower die, 3 upper insulating plate, 4 upper die, 5 positioning column, 6 electromagnetic coil, 7 sealing plate, 8 bidirectional screw, 9 moving block, 10 connecting rod, 11 first bevel gear, 12 rotating shaft, 13 second bevel gear, 14 crank, 15 first arc clamping plate, 16 sleeve, 17 moving rod, 18 spring, 19 second arc clamping plate, 20 one-way screw, 21 clamping plate, 22 threaded ring, 23 manual ring, 24 insulating material layer, 25 fixing seat. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Embodiment 1:

[0031] The structure of the existing electromagnetic heating device is to separate the electromagnetic coil from the fixing seat, one side of the electromagnetic coil is fixed on the fixing seat, and the other side of the electromagnetic coil is fixed to the mold. During electromagnetic heating, the magnetic field generated by the electromagnetic coil causes the metal mold to produce electromagnetic oscillations and generate heat, thereby heating the items contained in the mold. However, at the same time, since the fixing seat on the other side of the electromagnetic coil is also made of metal, it will also produce electromagnetic oscillations and generate heat at the same time. This heat can only be wasted, which not only causes energy loss, but also reduces the service life of the machine, and also makes the entire operation workshop always in a harsh environment of high temperature.

[0032] To solve this problem, the present invention proposes a new electromagnetic heating device, such as Figure 1 , Figure 2 As shown, the electromagnetic heating device includes a lower fixed seat and an upper fixed seat, and a lower mold and an upper mold respectively fixed to the surfaces of the lower fixed seat and the upper fixed seat, the lower fixed seat is a lower insulating plate 1, the upper fixed seat is an upper insulating plate 3, the lower mold 2 is arranged on the upper surface of the lower insulating plate 1, the upper mold 4 is arranged on the lower surface of the upper insulating plate 3, positioning columns 5 are fixed on both sides of the upper surface of the lower insulating plate 1, the upper insulating plate 3 is slidably arranged on the column walls of the two positioning columns 5, and the lower insulating plate 1 and the upper insulating plate 3 are respectively encapsulated and fixed with electromagnetic coils 6, and the two ends of the electromagnetic coil 6 respectively pass through the lower insulating plate 1 and the upper insulating plate 3, and are connected to a control board (not shown in the figure).

[0033] The present invention replaces the existing upper and lower fixing seats made of metal with insulating plates, and embeds a heating coil structure inside the insulating plate, thereby avoiding energy loss caused by synchronous heating of the existing fixing seats, making the heating effect more concentrated and efficient, effectively saving energy consumption, and reducing enterprise production costs.

[0034] Embodiment 2:

[0035] Since the sizes of molds are different, when the size of the mold to be processed changes, it is also necessary to replace the electromagnetic coil of the corresponding size to achieve the most efficient heating. In the electromagnetic heating device in the prior art, the heating plate (i.e., the electromagnetic coil) can be directly removed from the fixed seat and replaced with the electromagnetic coil of the corresponding size. As for the electromagnetic heating device in the first embodiment above, since the electromagnetic coil is embedded in the upper and lower insulating plates, the upper and lower insulating plates need to be completely disassembled and replaced, which also has the problem of cumbersome operation.

[0036] To this end, the applicant proposed another new type of electromagnetic heating device, see Figure 3 , Figure 4 , Figure 5 and Figure 7 The electromagnetic heating device comprises a lower fixed seat and an upper fixed seat, and a lower mold and an upper mold respectively fixed to the surfaces of the lower fixed seat and the upper fixed seat. The lower fixed seat is a lower insulating plate 1, the upper fixed seat is an upper insulating plate 3, the lower mold 2 is arranged on the upper surface of the lower insulating plate 1, and the upper mold 4 is arranged on the lower surface of the upper insulating plate 3. Positioning columns 5 are fixedly provided on both sides of the upper surface of the lower insulating plate 1, and the upper insulating plate 3 is slidably provided on the column walls of the two positioning columns 5. A heating groove is provided on the front side wall of the lower insulating plate 1 and the upper insulating plate 3, and an electromagnetic coil 6 is provided inside the heating groove. A sealing plate 7 is provided at the opening of the heating groove, and a clamping mechanism for fixing the electromagnetic coil 6 is provided on the sealing plate 7. A limiting mechanism for pressing the sealing plate 7 is provided on the front side wall of the lower insulating plate 1 and the upper insulating plate 3 and on both sides of the left and right sides of the heating groove. The present invention replaces the existing upper and lower fixing seats made of metal with insulating plates, and embeds the heating coil structure inside the insulating plate, thereby avoiding energy loss caused by synchronous heating of the fixing seats, making the heating effect more concentrated and efficient, effectively saving energy consumption, and reducing enterprise production costs.

[0037] The clamping mechanism includes a bidirectional screw 8, a moving block 9, a connecting rod 10, a first arc clamping plate 15, a first bevel gear 11, a second bevel gear 13 and a rotating shaft 12. The sealing plate 7 is a hollow structure. The bidirectional screw 8 is laterally located inside the sealing plate 7. The left and right inner walls of the sealing plate 7 are both embedded with first rolling bearings. Both ends of the bidirectional screw 8 are rotatably connected to the left and right inner walls of the sealing plate 7 through the first rolling bearings. The moving block 9 is symmetrically located inside the sealing plate 7 and the side wall is slidably connected to the inner wall of the sealing plate 7. The side walls of the two moving blocks 9 are threadedly connected to the rod wall of the bidirectional screw 8 through the first threaded hole and the second threaded hole respectively. The connecting rod 10 They are respectively fixed on the upper sides of the two moving blocks 9, and a strip hole for the two connecting rods 10 to pass through is opened on the upper side of the sealing plate 7. The first arc-shaped clamping plates 15 are respectively fixed on one end of the two connecting rods 10 located outside the sealing plate 7 and are symmetrically arranged. The electromagnetic coil 6 is located between the two first arc-shaped clamping plates 15. The first bevel gear 11 is fixedly arranged in the middle of the rod wall of the bidirectional screw rod 8. The rotating shaft 12 is vertically located below the bidirectional screw rod 8 and the lower end is rotatably connected to the lower side of the sealing plate 7 through a second rolling bearing and is fixedly provided with a crank handle 14. The upper end of the rotating shaft 12 is fixedly connected to the second bevel gear 13, and the first bevel gear 11 and the second bevel gear 13 are meshingly arranged.

[0038] The limiting mechanism includes a one-way screw 20, a clamping plate 21 and a threaded ring 22. The one-way screw 20 is fixedly arranged on the front side walls of the lower insulating plate 1 and the upper insulating plate 3 respectively. The surface of the clamping plate 21 is inserted into the rod wall of the one-way screw 20 through a socket. The threaded ring 22 is threadedly connected to the rod wall of the one-way screw 20 and fastens the clamping plate 21 to the upper insulating plate 3. A manual ring 23 is fixedly arranged on the side of the threaded ring 22 away from the clamping plate 21. The manual ring 23 is movably connected to the rod wall of the one-way screw 20, so as to limit and clamp the sealing plate 7 inside the heating tank.

[0039] In summary, when the new electromagnetic heating device is in use, since the electromagnetic coil 6 is fixedly arranged inside the lower insulating plate 1 and the upper insulating plate 3, it can be ensured that the electromagnetic coil 6 will only heat the lower mold 2 and the upper mold 4 effectively. After replacing the upper mold 4 and the lower mold 2 of different sizes, the staff manually rotates the manual ring 23 to separate the threaded ring 22 from the rod wall of the one-way screw 20, removes the clamping plate 21 from the rod wall of the one-way screw 20, and can remove the sealing plate 7 from the inside of the heating tank, so that the electromagnetic coil 6 can be removed from the inside of the heating tank. Then the hand turns the crank 14 to rotate the shaft 12, the shaft 12 can drive the second bevel gear 13 to rotate, the second bevel gear 13 can drive the first bevel gear 11 to rotate, and the bidirectional screw 8 can rotate. The bidirectional screw 8 can make the two moving blocks 9 move relatively away, so that the two first arc clamps 15 are separated through the two connecting rods 10, and the electromagnetic coil 6 can be taken out for replacement. After replacing the electromagnetic coils 6 of different sizes, the crank 14 is rotated in the opposite direction, so that the first arc-shaped clamping plate 15 clamps and fixes the electromagnetic coils 6 of different sizes, and then the sealing plate 7 is inserted into the heating tank, and the sealing plate 7 is pressed and limited inside the heating tank by the clamping plate 21 and the threaded ring 22. Finally, the upper insulating plate 3 is slid up and down on the column wall of the positioning column 5, and the distance between the upper insulating plate 3 and the lower insulating plate 1 is adjusted according to the mold size before powering on to start working.

[0040] Embodiment three:

[0041] See also Figure 3 , Figure 4 , Figure 6 and Figure 7The invention discloses a novel electromagnetic heating device, comprising a lower fixed seat and an upper fixed seat, and a lower mold and an upper mold respectively fixed to the surfaces of the lower fixed seat and the upper fixed seat. The lower fixed seat is a lower insulating plate 1, the upper fixed seat is an upper insulating plate 3, the lower mold 2 is arranged on the upper surface of the lower insulating plate 1, and the upper mold 4 is arranged on the lower surface of the upper insulating plate 3. Since the electromagnetic coil 6 is fixedly arranged inside the lower insulating plate 1 and the upper insulating plate 3, it can be ensured that the electromagnetic coil 6 will only effectively heat the lower mold 2 and the upper mold 4 when it is heated. Positioning columns 5 are fixedly arranged on both sides of the upper surface of the lower insulating plate 1, and the upper insulating plate 3 is slidably arranged on the column walls of the two positioning columns 5. A heating groove is provided on the front side wall of the upper insulating plate 3, and an electromagnetic coil 6 is arranged inside the heating groove, and a sealing plate 7 is arranged at the opening of the heating groove. A clamping mechanism for fixing the electromagnetic coil 6 is arranged on the sealing plate 7, and a limiting mechanism for pressing the sealing plate 7 is arranged on the front side wall of the upper insulating plate 3 and on both sides of the left and right sides of the heating groove. The present invention replaces the existing upper and lower fixing seats made of metal with insulating plates, and embeds the heating coil structure inside the insulating plate, thereby avoiding energy loss caused by synchronous heating of the fixing seats, making the heating effect more concentrated and efficient, effectively saving energy consumption, and reducing enterprise production costs.

[0042] The clamping mechanism includes a fixed seat 25, a sleeve 16, a moving rod 17, a spring 18 and a second arc-shaped clamping plate 19. The fixed seat 25 is fixedly arranged on the upper side of the sealing plate 7. The sleeve 16 is fixedly arranged on the upper side of the sealing plate 7 in a bilaterally symmetrical manner and is respectively located on both sides of the fixed seat 25. The moving rods 17 are respectively slidably arranged inside the two sleeves 16, the lower ends of the two moving rods 17 are respectively fixedly connected to the upper ends of the springs 18, the lower ends of the two springs 18 are respectively fixedly connected to the inner walls of the two sleeves 16, the upper ends of the two moving rods 17 are both extended to the outside of the corresponding sleeves 16 and are both fixedly connected to the second arc-shaped clamping plate 19, and the electromagnetic coil 6 is located between the fixed seat 25 and the second arc-shaped clamping plate 19.

[0043] The limiting mechanism includes a one-way screw 20, a clamping plate 21 and a threaded ring 22. The one-way screw 20 is fixedly arranged on the front side walls of the lower insulating plate 1 and the upper insulating plate 3 respectively. The surface of the clamping plate 21 is inserted into the rod wall of the one-way screw 20 through a socket. The threaded ring 22 is threadedly connected to the rod wall of the one-way screw 20 and fastens the clamping plate 21 to the upper insulating plate 3. A manual ring 23 is fixedly arranged on the side of the threaded ring 22 away from the clamping plate 21. The manual ring 23 is movably connected to the rod wall of the one-way screw 20, so as to limit and clamp the sealing plate 7 inside the heating tank.

[0044] In summary, when the new electromagnetic heating device is in use, since the electromagnetic coil 6 is fixedly arranged inside the lower insulating plate 1 and the upper insulating plate 3, it can be ensured that the electromagnetic coil 6 will only heat the lower mold 2 and the upper mold 4 effectively. After replacing the upper mold 4 and the lower mold 2 of different sizes, the staff manually rotates the manual ring 23 and separates the threaded ring 22 from the rod wall of the one-way screw 20, removes the clamping plate 21 from the rod wall of the one-way screw 20, and can remove the sealing plate 7 from the inside of the heating tank, so that the electromagnetic coil 6 can be removed from the inside of the heating tank. Then the staff pulls the second arc clamping plate 19, so that the moving rod 17 moves inside the sleeve 16 and stretches the spring 18, so that the electromagnetic coil 6 can be removed from the inside of the second arc clamping plate 19, which is convenient for replacing electromagnetic coils 6 of different sizes. After replacing the electromagnetic coil 6 of different sizes, loosen the second arc clamping plate 19, and the second arc clamping plate is reset under the elastic force of the spring 18, so that the electromagnetic coil 6 is fixed between the second arc clamping plate 19 and the fixing seat 25. Then insert the sealing plate 7 into the heating tank, and press the sealing plate 7 to limit the inside of the heating tank through the clamping plate 21 and the threaded ring 22. Finally, slide the upper insulating plate 3 up and down on the column wall of the positioning column 5, and after adjusting the distance between the upper insulating plate 3 and the lower insulating plate 1 according to the mold size, power on and start working.

[0045] It should be noted that the term "comprises" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electromagnetic heating device, comprising a lower fixing seat and an upper fixing seat, and a lower mold and an upper mold respectively fixed to the surfaces of the lower fixing seat and the upper fixing seat, characterized in that: The lower fixed seat is a lower insulating plate (1), the upper fixed seat is an upper insulating plate (3), the lower mold (2) is arranged on the upper surface of the lower insulating plate (1), the upper mold (4) is arranged on the lower surface of the upper insulating plate (3), positioning columns (5) are fixedly arranged on the left and right sides of the upper surface of the lower insulating plate (1), the upper insulating plate (3) is slidably arranged on the column walls of the two positioning columns (5), the front side walls of the lower insulating plate (1) and the upper insulating plate (3) are provided with heating grooves, the interior of the heating grooves is provided with electromagnetic coils (6), a sealing plate (7) is arranged at the opening of the heating grooves, a clamping mechanism for fixing the electromagnetic coils (6) is arranged on the sealing plate (7), and the front side walls of the lower insulating plate (1) and the upper insulating plate (3) and located on the left and right sides of the heating grooves are provided with limiting mechanisms for pressing the sealing plate (7); The clamping mechanism comprises a bidirectional screw (8), a moving block (9), a connecting rod (10), a first arc clamping plate (15), a first bevel gear (11), a second bevel gear (13) and a rotating shaft (12); the sealing plate (7) is a hollow structure; the bidirectional screw (8) is laterally located inside the sealing plate (7); the left and right inner side walls of the sealing plate (7) are both embedded with first rolling bearings; both ends of the bidirectional screw (8) are rotatably connected to the left and right inner side walls of the sealing plate (7) through the first rolling bearings; the moving block (9) is symmetrically located inside the sealing plate (7) and the side wall is slidably connected to the inner side wall of the sealing plate (7); the side walls of the two moving blocks (9) are respectively threadedly connected to the rod wall of the bidirectional screw (8) through the first threaded hole and the second threaded hole; the connecting rod (10) is respectively fixed The first arc-shaped clamping plates (15) are respectively fixedly arranged on the upper side of the two moving blocks (9), and the upper side of the sealing plate (7) is provided with a strip hole for the two connecting rods (10) to pass through. The first arc-shaped clamping plates (15) are respectively fixedly arranged on one end of the two connecting rods (10) located outside the sealing plate (7) and are symmetrically arranged. The electromagnetic coil (6) is located between the two first arc-shaped clamping plates (15). The first bevel gear (11) is fixedly arranged in the middle of the rod wall of the bidirectional screw rod (8). The rotating shaft (12) is vertically located below the bidirectional screw rod (8) and the lower end is rotatably connected to the lower side of the sealing plate (7) through a second rolling bearing and is fixedly provided with a crank handle (14). The upper end of the rotating shaft (12) is fixedly connected to the second bevel gear (13), and the first bevel gear (11) and the second bevel gear (13) are meshingly arranged. The limiting mechanism comprises a one-way screw (20), a clamping plate (21) and a threaded ring (22); the one-way screw (20) is fixedly arranged on the front side walls of the lower insulating plate (1) and the upper insulating plate (3), respectively; the surface of the clamping plate (21) is inserted into the rod wall of the one-way screw (20) through a plug hole; the threaded ring (22) is threadedly connected to the rod wall of the one-way screw (20) and fastens the clamping plate (21) and the upper insulating plate (3) together.

2. An electromagnetic heating device according to claim 1, characterized in that: The clamping mechanism comprises a fixed seat (25), a sleeve (16), a moving rod (17), a spring (18) and a second arc-shaped clamping plate (19); the fixed seat (25) is fixedly arranged on the upper side of the sealing plate (7); the sleeve (16) is fixedly arranged on the upper side of the sealing plate (7) in a bilaterally symmetrical manner and is respectively located on both sides of the fixed seat (25); the moving rod (17) is respectively slidably arranged inside the two sleeves (16); the lower ends of the two moving rods (17) are respectively fixedly connected to the upper ends of the springs (18); the lower ends of the two springs (18) are respectively fixedly connected to the inner walls of the two sleeves (16); the upper ends of the two moving rods (17) both extend to the outside of the corresponding sleeves (16) and are both fixedly connected to the second arc-shaped clamping plate (19); and the electromagnetic coil (6) is located between the fixed seat (25) and the second arc-shaped clamping plate (19).

3. The electromagnetic heating device according to claim 1, characterized in that: A manual ring (23) is fixedly provided on one side of the threaded ring (22) away from the clamping plate (21), and the manual ring (23) is movably sleeved with the rod wall of the one-way screw rod (20).

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