Electromagnetic induction heating device for plastic extruder

Abstract

The invention discloses an electromagnetic induction heating device for a plastic extruder, and relates to the technical field of plastic extruder heating, the electromagnetic induction heating device for the plastic extruder comprises an extruder main body and a mounting rack, and the outer surface of an extrusion pipe on the extruder main body is fixedly connected with a heat preservation ring pipe. A first bidirectional threaded rod drives a first transmission block and a first electromagnetic induction coil to reciprocate left and right, uniform electromagnetic heating is carried out on an extrusion pipe, meanwhile, heat preservation is carried out on the surface of the extrusion pipe through a heat preservation ring pipe, and meanwhile the extrusion pipe is heated while a connecting plate, a connecting column and a pushing plate are driven to reciprocate; the pushing plate drives the turbulent flow screw rod to move, and meanwhile, through flowing of the vent groove, hot air in the heat preservation ring pipe can flow in a reciprocating mode in a uniform mixing mode, so that hot air in the heat preservation ring pipe can evenly heat the extrusion pipe, and the extrusion pipe on the extruder body can be evenly heated.

Description

Technical Field

[0001] The invention relates to the technical field of plastic extruder heating, in particular to an electromagnetic induction heating device for a plastic extruder. Background Art

[0002] The plastic industry is a rapidly developing material industry. Plastic products are widely used in industrial and agricultural production and life. In the production process of cables, extrusion equipment is needed to heat the plastic and then extrude the cable skin. Extrusion equipment is the main equipment for cable processing. In the cable manufacturing process, the extruder is needed to heat the plastic raw materials. The existing electric heaters for plastic extrusion equipment are resistance heaters and electromagnetic heaters. Due to the high efficiency of electromagnetic heaters, most extruders currently use electromagnetic heating, which is also called electromagnetic induction heating. The principle of electromagnetic heating is that the structure composed of electronic circuit boards generates an alternating magnetic field. When the iron-containing container is placed above the alternating magnetic field, the iron container can cut the alternating magnetic field lines and generate an alternating current at the bottom of the container. The eddy current generated by the alternating current causes the carriers at the bottom of the iron container to form high-speed irregular motion, and the heat energy is generated by the mutual friction and collision between atoms and carriers, thereby heating the extrusion tube on the extruder through the electromagnetic induction heater.

[0003] At present, the electromagnetic heating device on the extruder mostly uses multiple electromagnetic coils to directly cover the surface of the extrusion tube for electromagnetic heating of the extrusion tube. During the heating process, it is found that the plastic is heated less uniformly, resulting in a small number of plastic particles not fully melted, which leads to reduced quality of the product extruded by the extruder. At the same time, due to the continuous heating of the electromagnetic coil during the heating process, the temperature of the extrusion tube will suddenly rise. If the elevated temperature cannot be cooled and adjusted in time, the excessively high temperature will cause part of the plastic to denature at high temperature, thereby affecting the performance of the plastic and thus the quality of the extruded product. At the same time, the current heating device can only heat the extrusion tube on the extruder to melt the plastic, and cannot preheat the plastic, resulting in a long heating time for the cable plastic in the extrusion tube, resulting in low extrusion efficiency of the extruder. Summary of the invention

[0004] The object of the present invention is to provide an electromagnetic induction heating device for a plastic extruder to solve the deficiencies in the above-mentioned background technology.

[0005] The purpose of the present invention can be achieved by the following technical solutions: An electromagnetic induction heating device for a plastic extruder comprises an extruder body and a mounting frame, wherein an outer surface of an extrusion tube on the extruder body is fixedly connected to a heat preservation coil tube, and both ends of the heat preservation coil tube are fixedly connected to sealing cover plates by bolts, and two first bidirectional threaded rods are rotatably connected in the mounting frame, and a plurality of first transmission blocks are threadedly matched on the outer surface of the first bidirectional threaded rod, and a first electromagnetic induction coil is fixedly connected to one side of the first transmission block, and a driving mechanism connected to the mounting frame is transmission-connected to one end of the first bidirectional threaded rod, and the driving mechanism is used to drive the first bidirectional threaded rod to rotate; A transmission box is fixedly connected in the mounting frame, a first transmission shaft is rotatably connected in the transmission box, the first transmission shaft is transmission-connected to the driving mechanism, one end of the first transmission shaft is transmission-connected to a preliminary feed heating mechanism connected to the feed funnel on the extruder body, the preliminary feed heating mechanism is used for preliminary heating of the plastic.

[0006] As a further solution of the present invention: the outer surface thread of the first bidirectional threaded rod is matched with a connecting plate, one side of the connecting plate is fixedly connected to a transmission column slidably connected to the sealing cover plate, one end of the transmission column is fixedly connected to a pushing plate slidably connected to the insulation circle tube, a plurality of ventilation grooves are opened in the insulation circle tube, a first temperature monitor is fixedly connected in the insulation circle tube, one side of the sealing cover plate is fixedly connected to a ventilation pipe, and an electromagnetic valve is arranged on the ventilation pipe.

[0007] As a further solution of the present invention: both sides of the push plate are fixedly connected with spoiler spiral rods.

[0008] As a further solution of the present invention: the driving mechanism includes a driving motor rotatably connected to the mounting frame, the output end of the driving motor is fixedly connected to a driving shaft via a coupling, the outer surface of the driving shaft is fixedly sleeved with a first driving gear, the outer surface of the first driving gear is meshingly connected with a second driving gear fixedly sleeved with a first bidirectional threaded rod, the outer surface of the driving shaft is connected to the outer surface of the first transmission shaft on the feed preliminary heating mechanism via a transmission wheel and a transmission belt, and the bottom of the transmission box is fixedly connected to a support plate fixedly connected to the feed funnel of the extruder body.

[0009] As a further solution of the present invention: the feed preliminary heating mechanism includes a transmission tube rotatably connected to the support plate, the transmission tube is rotatably connected to the transmission box, one end of the first transmission shaft is fixedly sleeved with a first bevel gear, the outer surface of the first bevel gear is meshingly connected with a second bevel gear, the middle of the second bevel gear is fixedly sleeved with a second transmission shaft rotatably connected to the transmission box, the outer surface of the second transmission shaft is fixedly sleeved with a first gear, the outer surface of the first gear is meshingly connected with a transmission gear ring fixedly connected to the transmission tube, the outer surface of the first gear is transmission-connected with a heating mechanism connected to the transmission tube, and the heating mechanism is used to heat the transmission tube.

[0010] As a further solution of the present invention: the heating mechanism includes a second bidirectional threaded rod rotatably connected to the support plate, the outer surface of the second bidirectional threaded rod is fixedly sleeved with a second gear meshing with the first gear, the outer surface of the second bidirectional threaded rod is threadedly matched with a plurality of second transmission blocks, the inner surface of the second transmission block is slidably connected with a guide rod fixedly connected to the support plate, the outer surface of the second transmission block is fixedly connected with a plurality of second electromagnetic induction coils, and an iron rod fixedly connected to the support plate is arranged inside the second electromagnetic induction coil.

[0011] As a further solution of the present invention: a plurality of stirring heat-conducting rods are fixedly connected to the outer surface of the transmission tube.

[0012] As a further solution of the present invention: a second temperature monitor is fixedly connected inside the transmission pipe.

[0013] As a further solution of the present invention: a plurality of adjustment mounting blocks are fixedly connected to the outer surface of the mounting frame, an adjustment bolt is threadedly connected to the adjustment mounting block, a fixing plate is fixedly connected to the bottom end of the adjustment bolt, and a plurality of connection bolts are threadedly connected to the fixing plate.

[0014] Beneficial effects of the present invention: (1) The first bidirectional threaded rod is driven by a driving mechanism to rotate forward and reversely, and the first bidirectional threaded rod is driven by the first transmission block and the first electromagnetic induction coil to move back and forth, so that the extruded tube is uniformly electromagnetically heated, and the surface of the extruded tube is insulated by the insulation tube. While heating, it drives the connecting plate, the connecting column and the push plate to move back and forth, and the push plate drives the spoiler spiral rod to move. At the same time, through the flow of the ventilation groove, the hot air flow in the insulation tube is uniformly mixed and reciprocated, so that the hot air in the insulation tube is uniformly heated to the extruded tube, so that the extruded tube on the extruder body is uniformly heated, effectively preventing the local temperature from being too high to cause the plastic to be denatured, thereby causing the performance of the plastic to be reduced, greatly improving the quality of the plastic extruded by the plastic extruder, and uniformly heating the extruded tube through a small number of first electromagnetic induction coils, and also reducing the energy consumption of electric heating.

[0015] (2) During the heating process, when the first temperature monitor in the insulation tube detects that the temperature on the surface of the extrusion tube is too high, the current of the first electromagnetic induction coil is controlled, and the electromagnetic valve on the ventilation pipe on the sealing cover is opened. At this time, the push plate moves in the insulation tube. At this time, the push plate pushes the hot air in the insulation tube and then discharges it through the ventilation pipe. At the same time, the other side of the push plate sucks the outside air into the insulation tube through the ventilation pipe for cooling and heat dissipation, thereby realizing timely cooling of the extrusion tube. When the temperature drops to a suitable temperature, the electromagnetic valve is closed, thereby realizing timely adjustment of the temperature of the extrusion tube, greatly improving the working stability of the extruder.

[0016] (3) The first transmission shaft is driven to rotate by the driving mechanism, and the first transmission shaft drives the transmission pipe and the second bidirectional threaded rod to rotate forward and backward through the first bevel gear, the second bevel gear, the second transmission shaft, the first gear, the transmission gear ring and the second gear. The second bidirectional threaded rod drives the second electromagnetic induction coil to move up and down to evenly heat the iron rod. The iron rod evenly heats the transmission pipe and the stirring heat-conducting rod. At the same time, the transmission pipe drives the stirring heat-conducting plate to rotate, thereby achieving uniform preliminary heating of the plastic in the feed hopper, achieving uniform preliminary heating of the plastic in the feed hopper, facilitating subsequent heating and extrusion of the plastic, reducing the subsequent heating time of the plastic, and further improving the extrusion efficiency of the plastic.

[0017] (4) At the same time, the first bidirectional threaded rod is driven by the driving mechanism to rotate forward and reversely, thereby driving the first electromagnetic induction coil to heat the extrusion tube on the extruder. At the same time, the first transmission shaft is driven by the driving mechanism to rotate while heating. The first transmission shaft drives the preliminary heating mechanism to perform preliminary heating on the plastic in the feed funnel, thereby realizing the simultaneous preliminary heating and extrusion heating of the plastic, greatly reducing the heating time of the plastic, thereby further improving the extrusion efficiency of the plastic. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 is a first stereogram of the external structure of the present invention; Figure 2 is a second stereoscopic diagram of the external structure of the present invention; Figure 3 It is a three-dimensional diagram of the internal structure of the heat-insulating coil tube of the present invention; Figure 4 It is a three-dimensional diagram of the internal structure of the feed hopper, the transmission box and the transmission pipe of the present invention; Figure 5 The present invention Figure 1 A magnified view of middle; Figure 6 The present invention Figure 4 Enlarged view of B.

[0020] In the figure: 1. extruder body; 2. mounting frame; 3. extrusion tube; 4. insulation ring tube; 5. sealing cover plate; 6. first bidirectional threaded rod; 7. first transmission block; 8. first electromagnetic induction coil; 9. transmission box; 10. first transmission shaft; 100. feeding funnel; 11. connecting plate; 12. transmission column; 13. push plate; 14. ventilation groove; 15. first temperature monitor; 16. ventilation pipe; 17. electromagnetic valve; 18. spoiler screw rod; 21. drive motor; 22. drive shaft; 23. The first driving gear; 24, the second driving gear; 25, the supporting plate; 31, the transmission tube; 32, the first bevel gear; 33, the second bevel gear; 34, the second transmission shaft; 35, the first gear; 36, the transmission gear ring; 41, the second bidirectional threaded rod; 42, the second gear; 43, the second transmission block; 44, the guide rod; 45, the second electromagnetic induction coil; 46, the iron rod; 47, the stirring heat-conducting rod; 48, the second temperature monitor; 51, the adjusting mounting block; 52, the adjusting bolt; 53, the fixing plate. DETAILED DESCRIPTION

[0021] 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.

[0022] Embodiment 1

[0023] See also Figure 1-Figure 6 As shown, the present invention is an electromagnetic induction heating device for a plastic extruder, comprising an extruder body 1 and a mounting frame 2, the outer surface of an extrusion tube 3 on the extruder body 1 is fixedly connected with a heat preservation coil tube 4, both ends of the heat preservation coil tube 4 are fixedly connected with sealing cover plates 5 by bolts, two first bidirectional threaded rods 6 are rotatably connected in the mounting frame 2, the outer surface of the first bidirectional threaded rod 6 is threadedly matched with a plurality of first transmission blocks 7, one side of the first transmission block 7 is fixedly connected with a first electromagnetic induction coil 8, one end of the first bidirectional threaded rod 6 is transmission-connected with a driving mechanism connected to the mounting frame 2, and the driving mechanism is used to drive the first bidirectional threaded rod 6 to rotate; A transmission box 9 is fixedly connected inside the mounting frame 2, and a first transmission shaft 10 is rotatably connected inside the transmission box 9. The first transmission shaft 10 is transmission-connected to the driving mechanism, and one end of the first transmission shaft 10 is transmission-connected to a feed preliminary heating mechanism connected to a feed funnel 100 on the extruder body 1, and the feed preliminary heating mechanism is used for preliminary heating of the plastic.

[0024] The outer surface of the first bidirectional threaded rod 6 is threadedly matched with a connecting plate 11, one side of the connecting plate 11 is fixedly connected to a transmission column 12 which is slidably connected to the sealing cover plate 5, one end of the transmission column 12 is fixedly connected to a push plate 13 which is slidably connected to the insulation circle tube 4, a plurality of ventilation grooves 14 are opened in the insulation circle tube 4, a first temperature monitor 15 is fixedly connected in the insulation circle tube 4, one side of the sealing cover plate 5 is fixedly connected to a ventilation pipe 16, and an electromagnetic valve 17 is provided on the ventilation pipe 16.

[0025] Both sides of the push plate 13 are fixedly connected with spoiler spiral rods 18 .

[0026] The driving mechanism includes a driving motor 21 rotatably connected to the mounting frame 2. The driving motor 21 is controlled by a PLC programming program, and can be controlled to rotate forward and backward and at a rotation angle. The output end of the driving motor 21 is fixedly connected to a driving shaft 22 through a coupling. The outer surface of the driving shaft 22 is fixedly sleeved with a first driving gear 23. The outer surface of the first driving gear 23 is meshingly connected with a second driving gear 24 fixedly sleeved with a first bidirectional threaded rod 6. The outer surface of the driving shaft 22 is connected to the outer surface of the first transmission shaft 10 on the feed preliminary heating mechanism through a transmission wheel and a transmission belt. The bottom of the transmission box 9 is fixedly connected to a support plate 25 fixedly connected to the feed funnel 100 of the extruder body 1.

[0027] The driving motor 21 drives the driving shaft 22 to rotate, and the driving shaft 22 drives the first bidirectional threaded rod 6 to rotate through the first driving gear 23 and the second driving gear 24. The driving shaft 22 drives the first transmission shaft 10 to rotate through the transmission wheel and the transmission belt.

[0028] The first bidirectional threaded rod 6 is driven by the driving mechanism to rotate forward and backward, and the first bidirectional threaded rod 6 drives the first transmission block 7 and the first electromagnetic induction coil 8 to move back and forth left and right. The first electromagnetic induction coil 8 moves back and forth left and right on the outer surface of the insulation coil 4. At this time, the first electromagnetic induction coil 8 is started, and the first electromagnetic induction coil 8 electromagnetically heats the extruded tube 3 on the extruder, and at the same time drives the first electromagnetic induction coil 8 to move back and forth left and right, so as to evenly heat the extruded tube 3. At the same time, the surface of the extruded tube 3 is insulated by the insulation coil 4 to prevent heat loss. At the same time, the first bidirectional threaded rod 6 drives the connecting plate 11 to move left and right. 1 drives the transmission column 12 to move back and forth left and right, and the transmission column 12 drives the push plate 13 in the insulation circle tube 4 to move back and forth left and right. When the push plate 13 moves forward, the hot air in the insulation circle tube 4 is pushed to one side, and then the hot air flows through the ventilation groove 14 in the insulation circle tube 4 and flows to the rear of the push plate 13. The rear of the push plate 13 sucks the airflow, and then drives the connecting plate 11, the transmission column 12 and the push plate 13 to move backward, driving the hot air to flow. At this time, the hot air flows backward through the ventilation groove 14, and the front of the push plate 13 sucks the hot air flow. At the same time, in the process of flowing, the hot air hits the side of the push plate 13. The hot air is disturbed on the spoiler spiral rod 18, so that the hot air flow in the insulation circle tube 4 is uniformly mixed and reciprocated, so that the hot air in the insulation circle tube 4 is uniformly heated to the extrusion tube 3, so that the extrusion tube 3 on the extruder body 1 is uniformly heated, effectively preventing the local temperature from being too high and causing the plastic to be denatured, thereby causing the performance of the plastic to be reduced, greatly improving the quality of the plastic extruded by the plastic extruder, and uniformly heating the extrusion tube 3 through the first electromagnetic induction coil 8 with fewer coils, and also reducing the energy consumption of electric heating. At the same time, during the heating process, when the first temperature monitor 15 in the insulation circle tube 4 detects that the extrusion tube 3 is When the temperature of the surface of the outlet tube 3 is too high, the current of the first electromagnetic induction coil 8 is controlled, and the electromagnetic valve 17 on the ventilation pipe 16 on the sealing cover plate 5 is opened at the same time. At this time, the pushing plate 13 moves in the insulation circle tube 4. At this time, the pushing plate 13 pushes the hot air in the insulation circle tube 4, and then discharges it through the ventilation pipe 16. At the same time, the other side of the pushing plate 13 sucks the outside air into the insulation circle tube 4 through the ventilation pipe 16 for cooling and heat dissipation, thereby realizing timely cooling of the extrusion tube 3. When the temperature drops to a suitable temperature, the electromagnetic valve 17 is closed at this time, thereby realizing timely adjustment of the temperature of the extrusion tube 3, greatly improving the working stability of the extruder.

[0029] Embodiment 2

[0030] Based on Example 1, please refer to Figure 2 , Figure 4 ,and Figure 6As shown, the preliminary heating mechanism for the feed includes a transmission tube 31 rotatably connected to the support plate 25, the transmission tube 31 is rotatably connected to the transmission box 9, one end of the first transmission shaft 10 is fixedly sleeved with a first bevel gear 32, the outer surface of the first bevel gear 32 is meshingly connected with a second bevel gear 33, the middle of the second bevel gear 33 is fixedly sleeved with a second transmission shaft 34 rotatably connected to the transmission box 9, the outer surface of the second transmission shaft 34 is fixedly sleeved with a first gear 35, the outer surface of the first gear 35 is meshingly connected with a transmission gear ring 36 fixedly connected to the transmission tube 31, the outer surface of the first gear 35 is transmission-connected with a heating mechanism connected to the transmission tube 31, and the heating mechanism is used to heat the transmission tube 31.

[0031] The heating mechanism includes a second bidirectional threaded rod 41 rotatably connected to the support plate 25, the outer surface of the second bidirectional threaded rod 41 is fixedly sleeved with a second gear 42 meshingly connected to the first gear 35, the outer surface of the second bidirectional threaded rod 41 is threadedly matched with a plurality of second transmission blocks 43, the inner surface of the second transmission block 43 is slidably connected with a guide rod 44 fixedly connected to the support plate 25, the outer surface of the second transmission block 43 is fixedly connected with a plurality of second electromagnetic induction coils 45, and an iron rod 46 fixedly connected to the support plate 25 is arranged inside the second electromagnetic induction coil 45.

[0032] A plurality of stirring heat-conducting rods 47 are fixedly connected to the outer surface of the transmission pipe 31 .

[0033] A second temperature monitor 48 is fixedly connected inside the transmission tube 31 .

[0034] The first transmission shaft 10 drives the second transmission shaft 34 to rotate back and forth through the first bevel gear 32 and the second bevel gear 33, the second transmission shaft 34 drives the transmission ring gear 36 to rotate through the first gear 35, the transmission ring gear 36 drives the transmission tube 31 to rotate, and at the same time the first gear 35 drives the second gear 42 to rotate, the second gear 42 drives the second bidirectional threaded rod 41 to rotate back and forth, the second bidirectional threaded rod 41 drives the second transmission block 43 and the second electromagnetic induction coil 45 to move up and down, and at the same time the second electromagnetic induction coil 45 is started, so that the second electromagnetic induction coil 45 moves up and down on the outer surface of the iron rod 46 to uniformly heat the iron rod 46, the iron rod 46 uniformly heats the inside of the transmission tube 31, and at the same time the transmission tube 31 stirs The heat conducting rod 47 conducts heat evenly, and at the same time, the stirring heat conducting rod 47 is driven to rotate through the transmission tube 31. The stirring heat conducting rod 47 performs uniform preliminary heating on the plastic in the feeding funnel 100, thereby achieving uniform preliminary heating of the plastic in the feeding funnel 100, facilitating subsequent heating and extrusion of the plastic, reducing the subsequent heating time of the plastic, and further improving the extrusion efficiency of the plastic. At the same time, the stirring heat conducting rod 47 is driven to rotate through the transmission tube 31 to facilitate the plastic to flow downward from the feeding funnel 100, effectively preventing feed blockage and improving feed smoothness. At the same time, when the temperature in the transmission tube 31 is too high, the second temperature monitor 48 detects that the temperature is too high, and begins to control the current of the second electromagnetic induction coil 45 to reduce the heating temperature of the iron rod 46.

[0035] At the same time, the first bidirectional threaded rod 6 is driven by the driving mechanism to rotate forward and reverse, thereby driving the first electromagnetic induction coil 8 to heat the extrusion tube 3 on the extruder. At the same time, the first transmission shaft 10 is driven by the driving mechanism to rotate while heating. The first transmission shaft 10 drives the preliminary heating mechanism to perform preliminary heating on the plastic in the feeding funnel 100, thereby realizing the simultaneous preliminary heating and extrusion heating of the plastic, greatly reducing the heating time of the plastic, thereby further improving the extrusion efficiency of the plastic.

[0036] Embodiment 3

[0037] Based on Example 1, please refer to Figure 1 and Figure 5 As shown, a plurality of adjustment mounting blocks 51 are fixedly connected to the outer surface of the mounting frame 2, and an adjustment bolt 52 is threadedly connected to the adjustment mounting block 51. The bottom end of the adjustment bolt 52 is fixedly connected to a fixing plate 53, and a plurality of connection bolts are threadedly connected to the fixing plate 53.

[0038] According to the different sizes of extruders, by rotating the adjusting bolt 52, the adjusting bolt 52 drives the fixing plate 53 to move, thereby adjusting the installation height of the mounting frame 2, so that the heating device can be suitable for different extruders, greatly improving the applicability of the heating device.

[0039] The working principle of the present invention is as follows: the first bidirectional threaded rod 6 is driven by a driving mechanism to rotate forward and reverse, the first bidirectional threaded rod 6 drives the first transmission block 7 and the first electromagnetic induction coil 8 to move back and forth left and right, the first electromagnetic induction coil 8 moves back and forth left and right on the outer surface of the insulation coil 4, at this time, the first electromagnetic induction coil 8 is started, the first electromagnetic induction coil 8 electromagnetically heats the extruded tube 3 on the extruder, and at the same time drives the first electromagnetic induction coil 8 to move back and forth left and right, so as to evenly heat the extruded tube 3, and at the same time, the surface of the extruded tube 3 is insulated by the insulation coil 4 to prevent heat loss, and at the same time, the first bidirectional threaded rod 6 drives the connecting plate 11 to move left and right The connecting plate 11 drives the transmission column 12 to move back and forth left and right, and the transmission column 12 drives the pushing plate 13 in the insulation circle tube 4 to move back and forth left and right. When the pushing plate 13 moves forward, the hot air in the insulation circle tube 4 is pushed to one side, and then the hot air flows through the ventilation groove 14 in the insulation circle tube 4, flows to the rear of the pushing plate 13, and the rear of the pushing plate 13 sucks the airflow, and then drives the connecting plate 11, the transmission column 12 and the pushing plate 13 to move backward, driving the hot air to flow. At this time, the hot air flows backward through the ventilation groove 14, and the front of the pushing plate 13 sucks the hot air flow. At the same time, during the flow process, the hot air hits the pushing plate The hot air is disturbed on the spoiler spiral rod 18 on the side of 13, so that the hot air flow in the insulation circle tube 4 is uniformly mixed and reciprocated, so that the hot air in the insulation circle tube 4 is uniformly heated to the extrusion tube 3, so that the extrusion tube 3 on the extruder body 1 is uniformly heated, effectively preventing the local temperature from being too high to cause the plastic to be denatured, thereby causing the performance of the plastic to be reduced, greatly improving the quality of the plastic extruded by the plastic extruder, and at the same time, the extrusion tube 3 is uniformly heated by the less first electromagnetic induction coil 8, which also reduces the energy consumption of electric heating. At the same time, during the heating process, when the first temperature monitor 15 in the insulation circle tube 4 monitors When the temperature on the surface of the extrusion tube 3 is too high, the current of the first electromagnetic induction coil 8 is controlled, and the electromagnetic valve 17 on the ventilation pipe 16 on the sealing cover plate 5 is opened at the same time. At this time, the pushing plate 13 moves in the insulation circle tube 4. At this time, the pushing plate 13 pushes the hot air in the insulation circle tube 4, and then discharges it through the ventilation pipe 16. At the same time, the other side of the pushing plate 13 sucks the outside air into the insulation circle tube 4 through the ventilation pipe 16 for cooling and heat dissipation, thereby realizing timely cooling of the extrusion tube 3. When the temperature drops to a suitable temperature, the electromagnetic valve 17 is closed at this time, thereby realizing timely adjustment of the temperature of the extrusion tube 3, greatly improving the working stability of the extruder.

[0040] The first transmission shaft 10 drives the second transmission shaft 34 to rotate back and forth through the first bevel gear 32 and the second bevel gear 33, the second transmission shaft 34 drives the transmission ring gear 36 to rotate through the first gear 35, the transmission ring gear 36 drives the transmission tube 31 to rotate, and at the same time the first gear 35 drives the second gear 42 to rotate, the second gear 42 drives the second bidirectional threaded rod 41 to rotate back and forth, the second bidirectional threaded rod 41 drives the second transmission block 43 and the second electromagnetic induction coil 45 to move up and down reciprocatingly, and at the same time the second electromagnetic induction coil 45 is started, so that the second electromagnetic induction coil 45 moves up and down reciprocatingly on the outer surface of the iron rod 46, and the iron rod 46 is evenly rotated. Heating, the iron rod 46 evenly heats the inside of the transmission tube 31, and the transmission tube 31 evenly conducts heat to the stirring heat-conducting rod 47, and at the same time, the stirring heat-conducting rod 47 is driven to rotate by the transmission tube 31, and the stirring heat-conducting rod 47 performs uniform preliminary heating on the plastic in the feeding funnel 100, thereby achieving uniform preliminary heating of the plastic in the feeding funnel 100, facilitating subsequent heating and extrusion of the plastic, reducing the subsequent heating time of the plastic, and further improving the extrusion efficiency of the plastic. At the same time, the stirring heat-conducting rod 47 is driven to rotate by the transmission tube 31, which is convenient for the plastic to flow downward from the feeding funnel 100, effectively preventing the feed from being blocked and improving the smoothness of the feed.

[0041] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An electromagnetic induction heating device for a plastic extruder, comprising an extruder body (1) and a mounting frame (2), characterized in that: The outer surface of the extrusion tube (3) on the extruder body (1) is fixedly connected to a heat-insulating coil tube (4), and both ends of the heat-insulating coil tube (4) are fixedly connected to sealing cover plates (5) by bolts. Two first bidirectional threaded rods (6) are rotatably connected inside the mounting frame (2), and the outer surfaces of the first bidirectional threaded rods (6) are threadedly matched with a plurality of first transmission blocks (7), and one side of the first transmission block (7) is fixedly connected to a first electromagnetic induction coil (8), and one end of the first bidirectional threaded rod (6) is transmission-connected to a driving mechanism connected to the mounting frame (2), and the driving mechanism is used to drive the first bidirectional threaded rod (6) to rotate; A transmission box (9) is fixedly connected inside the mounting frame (2), a first transmission shaft (10) is rotatably connected inside the transmission box (9), the first transmission shaft (10) is transmission-connected to a driving mechanism, one end of the first transmission shaft (10) is transmission-connected to a feed preliminary heating mechanism connected to a feed hopper (100) on an extruder body (1), the feed preliminary heating mechanism being used to perform preliminary heating on plastic.

2. The electromagnetic induction heating device for a plastic extruder according to claim 1, characterized in that: The outer surface of the first bidirectional threaded rod (6) is threadedly engaged with a connecting plate (11); one side of the connecting plate (11) is fixedly connected to a transmission column (12) slidably connected to the sealing cover plate (5); one end of the transmission column (12) is fixedly connected to a push plate (13) slidably connected to the insulation coil tube (4); a plurality of ventilation grooves (14) are provided in the insulation coil tube (4); a first temperature monitor (15) is fixedly connected in the insulation coil tube (4); one side of the sealing cover plate (5) is fixedly connected to a ventilation pipe (16); and an electromagnetic valve (17) is provided on the ventilation pipe (16).

3. The electromagnetic induction heating device for a plastic extruder according to claim 2, characterized in that: Both sides of the push plate (13) are fixedly connected with spoiler spiral rods (18).

4. The electromagnetic induction heating device for a plastic extruder according to claim 1, characterized in that: The driving mechanism comprises a driving motor (21) rotatably connected to the mounting frame (2); the output end of the driving motor (21) is fixedly connected to a driving shaft (22) via a coupling; the outer surface of the driving shaft (22) is fixedly sleeved with a first driving gear (23); the outer surface of the first driving gear (23) is meshingly connected with a second driving gear (24) fixedly sleeved with a first bidirectional threaded rod (6); the outer surface of the driving shaft (22) is connected to the outer surface of a first transmission shaft (10) on the feed preliminary heating mechanism via a transmission wheel and a transmission belt; the bottom of the transmission box (9) is fixedly connected to a support plate (25) fixedly connected to a feed hopper (100) of the extruder body (1).

5. The electromagnetic induction heating device for a plastic extruder according to claim 4, characterized in that: The feed preliminary heating mechanism comprises a transmission tube (31) rotatably connected to the support plate (25), the transmission tube (31) being rotatably connected to the transmission box (9), a first bevel gear (32) being fixedly sleeved on one end of the first transmission shaft (10), a second bevel gear (33) being meshingly connected to the outer surface of the first bevel gear (32), a second transmission shaft (34) rotatably connected to the transmission box (9) being fixedly sleeved in the middle of the second bevel gear (33), a first gear (35) being fixedly sleeved on the outer surface of the second transmission shaft (34), a transmission ring gear (36) being meshingly connected to the transmission tube (31) on the outer surface of the first gear (35), a heating mechanism connected to the transmission tube (31) being transmission-connected to the outer surface of the first gear (35), the heating mechanism being used to heat the transmission tube (31).

6. The electromagnetic induction heating device for a plastic extruder according to claim 5, characterized in that: The heating mechanism comprises a second bidirectional threaded rod (41) rotatably connected to the support plate (25); a second gear (42) meshingly connected to the first gear (35) is fixedly sleeved on the outer surface of the second bidirectional threaded rod (41); a plurality of second transmission blocks (43) are threadedly engaged on the outer surface of the second bidirectional threaded rod (41); a guide rod (44) fixedly connected to the support plate (25) is slidably connected to the inner surface of the second transmission block (43); a plurality of second electromagnetic induction coils (45) are fixedly connected to the outer surface of the second transmission block (43); an iron rod (46) fixedly connected to the support plate (25) is arranged inside the second electromagnetic induction coil (45).

7. The electromagnetic induction heating device for a plastic extruder according to claim 5, characterized in that: A plurality of stirring heat-conducting rods (47) are fixedly connected to the outer surface of the transmission tube (31).

8. The electromagnetic induction heating device for a plastic extruder according to claim 5, characterized in that: A second temperature monitor (48) is fixedly connected inside the transmission tube (31).

9. The electromagnetic induction heating device for a plastic extruder according to claim 1, characterized in that: A plurality of adjustment mounting blocks (51) are fixedly connected to the outer surface of the mounting frame (2), an adjustment bolt (52) is threadedly connected to the adjustment mounting block (51), a fixing plate (53) is fixedly connected to the bottom end of the adjustment bolt (52), and a plurality of connection bolts are threadedly connected to the fixing plate (53).

Images