Heating device of foam plastic forming machine and use method of heating device

Abstract

The invention discloses a heating device of a foam plastic forming machine and a using method thereof.The heating device comprises a lower mold plate, an upper mold plate is arranged over the lower mold plate, an inner cavity is formed in the lower mold plate, a heating box is fixedly connected to the side wall of the middle of the bottom in the inner cavity and is of a rectangular hollow structure, and side edge grooves are formed in the side walls of the four sides in the heating box; the metal processing box has the following advantages that the heating coils are embedded in the side grooves, the heating coils are electrified through the electrified wires during processing, a magnetic field can be formed in the middles of the heating coils, the metal processing box is placed in the middles of the heating coils, and the heating coils are arranged in the side grooves in a detachable connection mode. The heating coil is arranged in the processing box, so that the processing box reacts with a magnetic field in the middle of the heating coil, the processing box is rapidly heated, the processing box can be heated to a certain high temperature within a short time, plastic particles in the processing box are heated through heat conduction for foaming treatment, and the heating efficiency can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of a mold heating structure, in particular to a heating device of a foam molding machine. Background Art

[0002] Foam molding is one of the main production methods of plastic products. Plastic particles are placed in a mold, and then heated and pressurized to expand and foam. The foamed plastic is produced into corresponding products according to the mold. In order to ensure the effect of foaming production and the quality of the product, the plastic particles need to be heated evenly and comprehensively.

[0003] The current heating method is basically steam heating, which sends high-temperature steam into a channel pre-opened in the mold, and heats the mold through the flow of steam. However, as the steam flows, its temperature will gradually drop, which is not suitable for large molds. Also, because the temperature of the steam will gradually drop, it is easy to cause uneven heating, and uneven heating will affect the foaming effect of the plastic, resulting in production failure. Therefore, a heating device for a foam molding machine is proposed. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the current mold heating is uneven and large molds cannot be heated evenly for a long time. A heating device for a foam molding machine and a method of using the same are provided, so that the mold can be heated evenly and can be suitable for different mold specifications.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a heating device of a foam molding machine and a method of using the same, comprising a lower template, an upper template being arranged directly above the lower template, an inner cavity being provided inside the lower template, a heating box being fixedly connected to the middle side wall of the bottom of the inner cavity, the heating box being a rectangular hollow structure, side grooves being provided on the four side walls of the heating box, a heating coil being detachably embedded in the side grooves, a processing box being detachably plugged in the heating box, the processing box being located in the middle of the heating coil, a heat preservation board being detachably embedded and connected in the inner cavity and on the four sides of the heating box, the heat preservation board being a U-shaped structure, a power-carrying wire being connected through one side of the heating box, the power-carrying wire passing through the side wall of the lower template and connected to a power source, and the other end of the power-carrying wire being connected to the heating coil.

[0006] As a preferred technical solution of the present invention, a rectangular side panel is fixedly connected to the top of the lower template and close to the edge of the inner cavity, and a cover plate is detachably connected to the top of the lower template. A hole is opened through the middle of the cover plate, and the position and size of the hole correspond to the heating box. The four side edges of the bottom of the cover plate are fixedly connected to the lower panel, and a socket is opened through the lower panel, and a screw is inserted into the socket, and the lower panel is sleeved on the outer side of the side panel, and a screw hole is opened at the position of the side panel opposite to the socket, and one end of the screw passes through the socket and is threadedly inserted into the screw hole.

[0007] As a preferred technical solution of the present invention, screws are rotatably inserted and connected in the middle of the two side walls of the cover plate that are far away from each other, and the cover plate is provided with storage grooves inside the two screws. One side of the storage groove is a through structure, and the storage groove is communicated with the hole. A pressing plate is telescopically connected in the storage groove, and one end of the screw extending into the storage groove is threadedly inserted in the pressing plate. The lower edge of one end of the pressing plate close to the hole is an inclined structure, and the bottom side wall of the pressing plate is fixedly connected with an anti-slip pad.

[0008] As a preferred technical solution of the present invention, a mounting side plate is fixedly connected in the middle of the side walls opposite to the lower template, the mounting side plate is a U-shaped structure, the bottom edges of the inner walls on three sides of the mounting side plate are fixedly connected with a support plate, the mounting side plate and the inner walls of the support plate are fixedly connected with an anti-slip pad, and one end of the mounting side plate is an open structure and is provided with a sealing plate.

[0009] As a preferred technical solution of the present invention, the sealing plate is provided with mounting holes near both ends, a screw hole is provided at one end of the mounting side plate and at a position opposite to the mounting hole, and an extrusion block is fixedly connected to the side wall opposite to the mounting side plate, and the side walls at both ends of the extrusion block are fitted with the inner wall of the mounting side plate, and the sealing plate is threadedly connected to the screw hole on the mounting side plate by using a screw pin to pass through the mounting hole.

[0010] As a preferred technical solution of the present invention, a connecting plate is provided below the upper template, and the connecting plate is plug-in and detachably connected in the installation side plate. The size of the connecting plate corresponds to the internal size of the installation side plate, and one end of the connecting plate is tightly fitted with one end of the extrusion block. The middle side wall of the connecting plate away from the installation side plate is fixedly connected with a mold core, and the mold core corresponds to the processing box.

[0011] As a preferred technical solution of the present invention, a lifting groove is provided inside the processing box, the size of the processing box corresponds to that of the heating box, the top side wall of the processing box is located below the pressing plate and fits therewith, a fixed column is detachably connected to the four bottom corners of the lifting groove, a movable groove is provided in the fixed column, a spring is fixedly connected to the bottom end of the movable groove, a lifting column is telescopically and movably connected in the movable groove, and one end of the lifting column located in the fixed column is fixedly connected to the top of the spring.

[0012] As a preferred technical solution of the present invention, both sides of the lifting column near the top are elastically connected with blocks, and the blocks are of a semicircular structure. A discharge plate is provided above the lifting column, and a groove is provided in the middle of the top of the discharge plate. The four corner side walls of the discharge plate opposite to the lifting column are fixedly connected with connecting blocks, and a docking groove is provided in the connecting block. A card groove is provided in the docking groove and on the side wall opposite to the card block, and the card groove is of a semicircular structure corresponding to the card block.

[0013] A heating method for a foam molding machine, the specific heat preservation method is as follows:

[0014] S1. Insert the processing box into the heating box, and then rotate the screw to drive the pressing plate to extend from the storage groove, so that the pressing plate is pressed on the top side wall of the processing box through the bottom side wall to ensure the stability of the processing box inserted in the heating box, put the required plastic particles into the groove, and then lower the upper template to insert the mold core into the groove, and at the same time drive the upper template and the lower template to close tightly;

[0015] S2. The heating coil is energized by the electric wire, and the processing box located in the middle of the heating coil is heated by electromagnetic. Because the storage tank is a spiral winding structure, it can ensure that the processing box is heated evenly and the temperature at each position is the same, thereby improving the efficiency and reliability of heating;

[0016] S3. Filling the inner cavity with an insulation board can play a role in heat preservation and improve the efficiency of the next heating. Connecting the cover plate to the lower template with screws is convenient for later disassembly and maintenance.

[0017] The present invention has the following advantages: since a heating coil is embedded in the side groove, the heating coil is energized by a power line during processing, so that a magnetic field is formed in the middle of the heating coil, and a metal processing box is placed in the middle of the heating coil, so that the processing box reacts with the magnetic field in the middle of the heating coil, thereby rapidly heating the processing box, and heating the processing box to a certain high temperature in a very short time, and then heating the plastic particles in the processing box by heat conduction for foaming treatment, which can effectively improve the heating efficiency, shorten the time required for heating, and improve the overall processing efficiency, and since the heating coil is in a spiral state, the processing box can be heated evenly, avoiding the failure of foaming production caused by uneven heating;

[0018] Because plastic becomes sticky after foaming, a release agent needs to be applied in the groove. However, the groove is a concave structure, and demolding is still inconvenient. Therefore, a lifting column and a fixed column are connected to the bottom of the groove. After processing, as the connecting plate is lifted, the groove will also rise under the drive of the lifting column, thereby ejecting the product, making it easier for the staff to demold. The ejected groove can also improve the convenience of feeding plastic particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the exploded three-dimensional structure of the lower template of a preferred embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the lower template and the upper template of a preferred embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of a half-section structure of a cover plate according to a preferred embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the upper template structure in a preferred embodiment of the present invention when viewed from the bottom;

[0023] Figure 5 It is a schematic diagram of the exploded structure of a processing box according to a preferred embodiment of the present invention;

[0024] Figure 6 It is a schematic diagram of the exploded structure of the fixed column and the lifting column of a preferred embodiment of the present invention.

[0025] Explanation of the reference numerals: 1. lower template; 2. inner cavity; 3. side panel; 4. heating box; 5. side groove; 6. heating coil; 7. electric wire; 8. insulation board; 9. cover plate; 10. hole; 11. screw; 12. processing box; 13. upper template; 14. connecting plate; 15. core; 16. storage groove; 17. pressing plate; 18. lower panel; 19. socket; 20. screw; 21. mounting side plate; 22. support plate; 23. sealing plate; 24. extrusion block; 25. mounting hole; 26. lifting groove; 27. fixing column; 28. lifting column; 29. ​​clamping block; 30. discharge plate; 31. groove; 32. connecting block; 33. movable groove; 34. spring; 35. docking groove; 36. clamping groove. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] Embodiment 1

[0028] Please refer to Figure 1 and 3 The present invention discloses a heating device for a foam molding machine and a method for using the same, comprising a lower template 1, an upper template 13 being arranged on the lower template 1, an inner cavity 2 being provided inside the lower template 1, a heating box 4 being fixedly connected to the middle side wall of the bottom of the inner cavity 2, the heating box 4 being a rectangular hollow structure, side grooves 5 being provided on the four side walls of the heating box 4, a heating coil 6 being detachably connected and embedded in the side grooves 5, a processing box 12 being detachably plugged in the heating box 4, the processing box 12 being located in the middle of the heating coil 6, a heat preservation board 8 being detachably embedded and connected in the inner cavity 2 and on the four sides of the heating box 4, the heat preservation board 8 being a U-shaped structure, a conducting wire 7 being connected through and inserted on one side of the heating box 4, the conducting wire 7 passing through the side wall of the lower template 1 and connected to a power source, and the other end of the conducting wire 7 being connected to the heating coil 6;

[0029] A rectangular side panel 3 is fixedly connected to the top of the lower template 1 and near the edge of the inner cavity 2. A cover plate 9 is detachably connected to the top of the lower template 1. A hole 10 is opened through the middle of the cover plate 9. The position and size of the hole 10 correspond to the heating box 4. A lower panel 18 is fixedly connected to the four side edges of the bottom of the cover plate 9. A socket 19 is opened through the lower panel 18. A screw 20 is inserted into the socket 19. The lower panel 18 is sleeved on the outer side of the side panel 3. A screw hole is opened at the position opposite to the socket 19. One end of the screw 20 passes through the socket 19 and is threadedly inserted into the screw hole.

[0030] The technical effect of this scheme is as follows: the processing box 12 is placed in the heating box 4, and then the plastic particles are placed in the groove 31. The cover plate 9 is driven down by the lifting mechanism and closed on the top of the lower mold plate 1. The heating coil 6 is energized by the power line 7, and the metal processing box 12 is heated by the magnetic field generated by the heating coil 6, so that the plastic particles in the groove 31 are heated and foamed. As the plastic foams, it will be produced into corresponding products according to the mold core 15. Because it is electromagnetic heating, the temperature of the processing box 12 can be increased in a very short time, shortening the time consumed for heating, thereby improving the overall processing efficiency. Thanks to the spiral state structure of the heating coil 6 and the equal spacing between each layer of coils, the processing box 12 can be fully and evenly heated to avoid uneven heating and production failure. At the same time, because the heating energy will not decay, the heating reliability can be improved for long-term continuous heating, and different sizes can be designed according to needs to heat molds of different sizes.

[0031] Screws 11 are rotatably and interlaced in the middle of the side walls of the cover plate 9 that are far away from each other. Receiving grooves 16 are opened in the cover plate 9 inside the two screws 11. One side of the receiving groove 16 is a through structure, and the receiving groove 16 is communicated with the hole 10. A pressing plate 17 is telescopically and movably connected in the receiving groove 16. One end of the screw 11 extending into the receiving groove 16 is threadedly inserted in the pressing plate 17. The lower edge of the end of the pressing plate 17 close to the hole 10 is an inclined structure, and the bottom side wall of the pressing plate 17 is fixedly connected with an anti-slip pad.

[0032] In order to improve the reliability of the connection between the processing box 12 and the heating box 4, the screw 11 is rotated after the processing box 12 is inserted into the heating box 4, and the pressing plate 17 is driven to extend from the receiving groove 16 through the threaded connection. The extended part of the bottom side wall will be pressed on the top of both sides of the processing box 12, so that the processing box 12 is stably pressed in the heating box 4 to avoid problems such as shaking during the processing. The extended length of the pressing plate 17 is flush with the inner wall of the processing box 12 to avoid affecting the lifting and exit of the mold core 15.

[0033] Embodiment 2

[0034] Please refer to Figure 2 and 4The upper template 13 is fixedly connected with a mounting side plate 21 in the middle of the side wall opposite to the lower template 1. The mounting side plate 21 is a U-shaped structure. The bottom edges of the inner walls on the three sides of the mounting side plate 21 are fixedly connected with a support plate 22. The inner walls of the mounting side plate 21 and the support plate 22 are fixedly connected with anti-slip pads. One end of the mounting side plate 21 is an open structure and is provided with a sealing plate 23. The sealing plate 23 is provided with mounting holes 25 near both ends. A screw hole is provided at one end of the mounting side plate 21 and at a position opposite to the mounting hole 25. The sealing plate 23 is fixedly connected with an extrusion pad on the side wall opposite to the mounting side plate 21. Block 24, the side walls at both ends of the extrusion block 24 fit with the inner wall of the installation side plate 21, the sealing plate 23 is threadedly connected to the screw hole on the installation side plate 21 using a screw pin passing through the installation hole 25, and a connecting plate 14 is set below the upper template 13. The connecting plate 14 is plug-in and detachably connected to the installation side plate 21. The size of the connecting plate 14 corresponds to the internal size of the installation side plate 21, and one end of the connecting plate 14 is tightly fitted with one end of the extrusion block 24. The connecting plate 14 is fixedly connected to the middle side wall away from the installation side plate 21 with a core 15, and the core 15 corresponds to the processing box 12.

[0035] The technical effect of this solution is as follows: because the product produced is mainly determined by the shape and size of the mold core 15, different connecting plates 14 and mold cores 15 need to be replaced from time to time, and the current connection method of the connecting plate 14 is not convenient for disassembly, because many screws 20 need to be removed, and repeated position and horizontal adjustments are required, otherwise the quality of the final product will be affected. Therefore, a mounting side plate 21 is fixed to the bottom side wall of the upper template 13, and the connecting plate 14 is inserted into the mounting side plate 21 through the edges on both sides. The supporting plate 22 can provide supporting force for the connecting plate 14 to ensure the stability of the connecting plate 14 after insertion, because the mounting side plate 21 is fixed to the upper template 13. At the same time, because the support plate 22 is in a horizontal state, there is no need to adjust the horizontality, which greatly saves installation time and improves the efficiency of disassembly and assembly. At the same time, anti-slip pads are fixed on the inner walls of the installation side plate 21 and the support plate 22 to increase the stability of the connection of the connection plate 14. After the sealing plate 23 is connected to the installation side plate 21, the extrusion block 24 will squeeze the connection plate 14 to avoid the connection plate 14 from shaking and other problems. Disassembly only requires removing the sealing plate 23 and then pulling out the connection plate 14 and replacing it with a new connection plate 14. Because the time spent on replacing the core 15 is reduced, the overall processing efficiency can be improved.

[0036] Embodiment 2

[0037] Please refer to Figure 2 and 5-6, a lifting groove 26 is provided inside the processing box 12, the size of the processing box 12 corresponds to the heating box 4, the top side wall of the processing box 12 is located below the pressing plate 17 and fits with it, and a fixed column 27 is detachably connected to the four corners of the bottom of the lifting groove 26, and a movable groove 33 is provided in the fixed column 27, and a spring 34 is fixedly connected to the bottom end of the movable groove 33, and a lifting column 28 is telescopically connected in the movable groove 33, and one end of the lifting column 28 located in the fixed column 27 is fixedly connected to the spring 34. 4, both sides of the lifting column 28 near the top are elastically connected with a card block 29, the card block 29 is a semicircular structure, a discharge plate 30 is set above the lifting column 28, a groove 31 is provided in the middle of the top of the discharge plate 30, and the four corner side walls of the discharge plate 30 opposite to the lifting column 28 are fixedly connected with a connecting block 32, a docking groove 35 is provided in the connecting block 32, and a card groove 36 is provided in the docking groove 35 and on the side wall opposite to the card block 29, and the card groove 36 is a semicircular structure corresponding to the card block 29.

[0038] The technical effect of this solution is as follows: the fixed column 27 is connected to the lifting groove 26, and the spring 34 and the lifting column 28 are connected from bottom to top in the movable groove 33 opened inside the fixed column 27. When the foaming is completed and the mold core 15 is lifted, the discharge plate 30 loses pressure. At this time, the lifting column 28 is pushed upward under the drive of the spring 34, thereby pushing the discharge plate 30 upward, so that the molded product can be ejected, which is convenient for the staff to take the mold, and the ejected discharge plate 30 also makes it convenient for the staff to put the plastic particles into the groove 31, thereby improving the convenience of production.

[0039] Specifically, when the present invention is used, the processing box 12 is inserted into the heating box 4, and then the screw 11 is rotated to drive the pressing plate 17 to extend out of the receiving groove 16, so that the pressing plate 17 is pressed on the top side wall of the processing box 12 through the bottom side wall, ensuring the stability of the processing box 12 inserted into the heating box 4, and the required plastic particles are placed in the groove 31, and then the upper template 13 is lowered to insert the mold core 15 into the groove 31, and at the same time, the upper template 13 and the lower template 1 are driven to close tightly, and the heating coil 6 is energized by the power line 7, and the processing box 12 located in the middle of the heating coil 6 is heated by electromagnetic. Because the receiving groove 16 is a spiral winding structure, In order to ensure that the processing box 12 is heated evenly and the temperature at each position is the same, and the efficiency and reliability of heating are improved, the insulation board 8 is filled in the inner cavity 2 to play a role in heat preservation, which can improve the efficiency of the next heating. The plastic particles will be foamed by heating, and the corresponding plastic products will be produced according to the shape of the mold core 15. After the production is completed, the mold core 15 is lifted by the lifting equipment. As the mold core 15 is lifted, the lifting column 28 pushes the discharge plate 30 upward under the drive of the spring 34, which is convenient for the staff to remove the product, and then put new plastic particles for production. The cover plate 9 is connected to the lower template 1 by screws 20, which is convenient for later disassembly and maintenance;

[0040] When necessary, the sealing plate 23 is removed and then the connecting plate 14 is pulled out, and the new connecting plate 14 is inserted into the installation side plate 21 and the sealing plate 23 is closed to complete the replacement of the mold core 15, thereby improving the efficiency of replacement and increasing the convenience of production.

[0041] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

[0042] Other parts of the present invention not described in detail belong to the prior art and will not be described in detail here.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heating device for a foam molding machine, comprising a lower template (1), wherein an upper template (13) is arranged on the lower template (1), characterized in that: The lower template (1) has an inner cavity (2) therein, a heating box (4) is fixedly connected to the middle side wall of the bottom of the inner cavity (2), the heating box (4) is a rectangular hollow structure, the four side walls of the heating box (4) are all provided with side grooves (5), a heating coil (6) is embedded in the side grooves (5) and is detachably connected, a processing box (12) is detachably plugged into the heating box (4), the processing box (12) is located in the middle of the heating coil (6), a heat preservation board (8) is detachably embedded in the four sides of the inner cavity (2) and located on the heating box (4), the heat preservation board (8) is a U-shaped structure, a power supply wire (7) is connected through one side of the heating box (4), the power supply wire (7) passes through the side wall of the lower template (1) and is connected to a power source, and the other end of the power supply wire (7) is connected to the heating coil (6).

2. A heating device for a foam molding machine as claimed in claim 1, characterized in that: A rectangular side panel (3) is fixedly connected to the top of the lower template (1) and near the edge of the inner cavity (2); a cover plate (9) is detachably connected to the top of the lower template (1); a hole (10) is provided through the middle of the cover plate (9); the position and size of the hole (10) correspond to the heating box (4); a lower panel (18) is fixedly connected to the four side edges of the bottom of the cover plate (9); a socket (19) is provided through the lower panel (18); a screw (20) is inserted into the socket (19); the lower panel (18) is sleeved on the outer side of the side panel (3); a screw hole is provided at a position of the side panel (3) opposite to the socket (19); one end of the screw (20) passes through the socket (19) and is threadedly inserted into the screw hole.

3. A heating device for a foam molding machine as claimed in claim 2, characterized in that: The cover plate (9) has screw rods (11) rotatably and interlaced in the middle of the two side walls away from each other. The cover plate (9) is provided with receiving grooves (16) inside the two screw rods (11). One side of the receiving groove (16) is a through structure, and the receiving groove (16) is communicated with the hole (10). A pressing plate (17) is telescopically and movably connected in the receiving groove (16). One end of the screw rod (11) extending into the receiving groove (16) is threadedly inserted in the pressing plate (17). The lower edge of one end of the pressing plate (17) close to the hole (10) is an inclined structure. The bottom side wall of the pressing plate (17) is fixedly connected with an anti-slip pad.

4. A heating device for a foam molding machine as claimed in claim 1, characterized in that: A mounting side plate (21) is fixedly connected in the middle of the side walls opposite to the lower template (1) and the mounting side plate (21) is a U-shaped structure. The bottom edges of the inner walls on three sides of the mounting side plate (21) are fixedly connected to a support plate (22). The inner walls of the mounting side plate (21) and the support plate (22) are fixedly connected to anti-slip pads. One end of the mounting side plate (21) is an open structure and is provided with a sealing plate (23).

5. A heating device for a foam molding machine as claimed in claim 4, characterized in that: The sealing plate (23) is provided with mounting holes (25) near both ends, and a screw hole is provided at one end of the mounting side plate (21) at a position opposite to the mounting hole (25). The side walls of the sealing plate (23) and the mounting side plate (21) opposite to each other are fixedly connected with an extrusion block (24), and the side walls at both ends of the extrusion block (24) are fitted with the inner wall of the mounting side plate (21). The sealing plate (23) is threadedly connected to the screw hole on the mounting side plate (21) by passing a screw pin through the mounting hole (25).

6. A heating device for a foam molding machine as claimed in claim 1, characterized in that: A connecting plate (14) is provided below the upper template (13). The connecting plate (14) is plugged and detachably connected in the mounting side plate (21). The size of the connecting plate (14) corresponds to the internal size of the mounting side plate (21), and one end of the connecting plate (14) is tightly fitted with one end of the extrusion block (24). The middle side wall of the connecting plate (14) away from the mounting side plate (21) is fixedly connected with a mold core (15), and the mold core (15) corresponds to the processing box (12).

7. A heating device for a foam molding machine as claimed in claim 1, characterized in that: A lifting groove (26) is provided inside the processing box (12). The size of the processing box (12) corresponds to that of the heating box (4). The top side wall of the processing box (12) is located below the pressing plate (17) and fits therewith. A fixed column (27) is detachably connected to the four corners of the bottom of the lifting groove (26). A movable groove (33) is provided inside the fixed column (27). A spring (34) is fixedly connected to the bottom end of the movable groove (33). A lifting column (28) is telescopically and movably connected inside the movable groove (33). One end of the lifting column (28) located inside the fixed column (27) is fixedly connected to the top of the spring (34).

8. A heating device for a foam molding machine as claimed in claim 7, characterized in that: Both sides of the lifting column (28) near the top are elastically connected with a clamping block (29), and the clamping block (29) is a semicircular structure. A material discharge plate (30) is arranged above the lifting column (28), and a groove (31) is provided in the middle of the top of the material discharge plate (30). The four corner side walls of the material discharge plate (30) opposite to the lifting column (28) are fixedly connected with a connecting block (32), and a docking groove (35) is provided in the connecting block (32). A clamping groove (36) is provided in the docking groove (35) and on the side wall opposite to the clamping block (29), and the clamping groove (36) is a semicircular structure corresponding to the clamping block (29).

9. A method for heating a foam molding machine, using the heating device for a foam molding machine according to claim 1, characterized in that: The specific insulation methods are as follows: S1, insert the processing box (12) into the heating box (4), then rotate the screw (11) to drive the pressing plate (17) to extend out from the receiving groove (16), so that the pressing plate (17) is pressed on the top side wall of the processing box (12) through the bottom side wall to ensure the stability of the processing box (12) inserted into the heating box (4), put the required plastic particles into the groove (31), then lower the upper mold plate (13) to insert the mold core (15) into the groove (31), and at the same time drive the upper mold plate (13) and the lower mold plate (1) to close tightly; S2, the heating coil (6) is energized by the power line (7), and the processing box (12) located in the middle of the heating coil (6) is heated by electromagnetic force. Because the storage groove (16) is a spiral winding structure, it can ensure that the processing box (12) is heated evenly and the temperature at each position is the same, thereby improving the efficiency and reliability of heating; S3. Filling the inner cavity (2) with a heat-insulating plate (8) can play a role in heat preservation and improve the efficiency of the next heating. Connecting the cover plate (9) to the lower template (1) via screws (20) facilitates subsequent disassembly and maintenance.

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