An air-cooled electromagnetic induction heating roller

Abstract

The present invention provides an air-cooled electromagnetic induction heating roller applied to the field of heating rollers, comprising a roller body fixed between two groups of driving shafts, an electromagnetic coil is arranged in the roller body, a heat conducting pipe is also arranged in the roller body, and a heat insulating pipe is fixed on the inner side of the heat conducting pipe; a heat exchange chamber is arranged between the heat conducting pipe and the roller body, an outer chamber is arranged between the heat conducting pipe and the heat insulating pipe, and an inner chamber is arranged inside the heat insulating pipe; a driving mechanism for driving the gas in the heat exchange chamber to circulate in the outer chamber, the inner chamber and the outer space of the roller body is arranged on the heat insulating pipe. When the roller body reaches the design temperature, the present application connects the roller body with the outside, utilizes external cold air to synchronously cool the heat conducting pipe and the roller body, thereby maintaining a uniform and stable working temperature of the roller body, avoiding deformation, reduced hardness, weakened strength and other problems caused by temperature accumulation on the surface of the roller body, has market prospects, and is suitable for popularization and application.

Description

Technical Field

[0001] The present application relates to the field of heating rollers, and in particular to an air-cooled electromagnetic induction heating roller. Background Art

[0002] Electromagnetic induction heating has the advantages of rapid heating, high efficiency and energy saving, and uniform temperature, which can significantly improve production efficiency and product quality.

[0003] However, the heat generated during electromagnetic induction heating requires an effective heat dissipation method to ensure the stable operation of the heating roller. When the electromagnetic heating roller is working, the internal induction coil will generate a lot of heat. If the heat is not dissipated in time, the coil temperature will continue to rise. When it exceeds its tolerance limit, it may cause problems such as damage to the insulation layer of the coil, deformation of the roller body, and reduction in the precision of the rolling dimensions, which will affect the quality of the processed products. Therefore, an air-cooled electromagnetic induction heating roller is proposed. Summary of the invention

[0004] The purpose of the present application is to solve the technical problem that the existing electromagnetic induction heating roller has poor heat dissipation efficiency, which leads to roller damage. Compared with the existing technology, an air-cooled electromagnetic induction heating roller is provided, which includes a roller fixed between two groups of drive shafts, an electromagnetic coil is arranged in the roller body, a coaxially arranged heat conduction pipe is also arranged in the roller body, a heat insulation pipe is fixed on the inner side of the heat conduction pipe, and two groups of the electromagnetic coils are symmetrically sleeved on the outer side of the heat insulation pipe;

[0005] The heat-conducting pipe is connected between the two sets of driving shafts and reciprocates at a fixed angle. The outer wall of the heat-conducting pipe is provided with a plurality of heat-conducting fins arranged at equal angles. The inner wall of the roller body is provided with heat-dissipating fins corresponding to the heat-conducting fins. A heat exchange chamber is provided between the heat-conducting pipe and the roller body. An outer chamber is provided between the heat-conducting pipe and the insulation pipe. An inner chamber is provided inside the insulation pipe.

[0006] The heat-insulating pipe is provided with a driving mechanism for driving the gas in the heat exchange chamber to circulate in the outer chamber, the inner chamber and the outer space of the roller body.

[0007] Furthermore, a number of limit blocks are fixed at equal angles at both ends of the heat pipe, one end of the driving shaft is provided with a limit slot corresponding to the limit block, and a thermal expansion mechanism and a tensioning spring are respectively clamped between the limit block and the two ends of the limit slot, and the tensioning spring has an elastic force to drive the limit block close to the thermal expansion mechanism.

[0008] Further, an annular air duct is provided on the inner side of the middle of the heat conducting pipe, and a plurality of inner air ducts evenly arranged at equal angles are connected to both sides of the annular air duct, and a plurality of outer holes arranged at equal angles are provided on the outer side of the circular ring of the annular air duct, and the annular air duct is connected to the heat exchange chamber through the outer holes, and a mixing chamber is provided between the ends of the heat conducting pipe and the insulation pipe, and one end of the inner air duct away from the annular air duct extends into the mixing chamber, and an air inlet channel connecting the heat exchange chamber and the mixing chamber is also provided at the end of the heat conducting pipe;

[0009] Two groups of symmetrically arranged inner through holes are arranged on the inner side of the circular ring of the annular air duct, and the heat exchange chamber is connected with the outer chamber through the inner through holes.

[0010] Furthermore, a plurality of first air inlet holes arranged at equal distances are provided on the port side of the roller body, and a second air inlet hole corresponding to the first air inlet hole is provided at the end of the heat conducting pipe;

[0011] The heat insulation tube is a ceramic structure, an outer connecting ring is provided at the end of the heat insulation tube, a discharge channel penetrating along the axis is provided on the drive shaft, an inner connecting ring corresponding to the outer connecting ring is provided on the drive shaft, an outer valve plate is also fixed inside the outer connecting ring, the outer valve plate extends into the discharge channel of the drive shaft, and an inner valve plate corresponding to the outer valve plate is provided in the discharge channel;

[0012] The inner connecting ring, the outer connecting ring, the outer valve plate and the inner valve plate are all provided with a plurality of through holes evenly distributed at equal angles.

[0013] Furthermore, when the tensioning spring is in a free state, the heat-conducting tube and the heat-insulating tube rotate counterclockwise at a fixed angle. At this time, the heat-conducting fins are displaced to the middle of the two groups of heat-dissipating fins, and at this time, the second air inlet hole and the first air inlet hole, the through holes on the outer valve plate and the inner valve plate are staggered and closed, and the through holes on the inner connecting ring and the outer connecting ring overlap and are open.

[0014] Furthermore, when the tensioning spring is in a compressed state, the heat-conducting tube and the heat-insulating tube rotate clockwise at a fixed angle. At this time, the heat dissipating fins conflict with the heat-conducting fins, and at this time, the second air inlet hole and the first air inlet hole, the through holes on the outer valve plate and the inner valve plate coincide with each other and are open, and the through holes on the inner connecting ring and the outer connecting ring are staggered and closed.

[0015] Furthermore, a thermal conductive coating is fixed to the side of the heat dissipating fin that contacts the thermal conductive fin.

[0016] Furthermore, a ball groove is provided in the middle of the insulation tube, and a rotating seat is provided on both the upper and lower sides of the ball groove;

[0017] The driving mechanism includes a plurality of main blades arranged at equal angles, auxiliary blades are fixed on the upper and lower sides of the main blades, and a rotating ring matching the rotating seat is provided on the outer sides of the auxiliary blades at the same end, and the driving mechanism is rotatably connected to the rotating seat through the rotating ring.

[0018] Furthermore, the rotation axis of the driving mechanism intersects with the axis of the insulation tube and is arranged perpendicularly, the axes of the two groups of electromagnetic coils are respectively arranged on both sides of the rotation axis of the driving mechanism, and an air guide groove is also provided at the connection node between the main blade and the auxiliary blade. The air guide groove is used to connect the outer warehouse and the inner warehouse, and the end of the auxiliary blade away from the main blade is arranged opposite to the inner through hole.

[0019] Furthermore, the driving mechanism is arranged between the ends of the two groups of electromagnetic coils, and permanent magnets with different magnetic poles are respectively arranged on both sides of the main blade, and the outer walls of the permanent magnets are also coated with a heat insulation coating.

[0020] Compared with the prior art, the advantages of this application are:

[0021] The present invention is provided with a heat-conducting pipe and a heat-insulating pipe, and utilizes an electromagnetic coil to drive a driving mechanism to rotate. Before reaching the design temperature, the roller body can be internally sealed to improve the heating efficiency. When the design temperature is reached, the roller body is connected to the outside, and the heat conduction of the heat-conducting pipe is utilized to quickly absorb the temperature of the roller body. External cold air is utilized to synchronously cool the heat-conducting pipe and the roller body, thereby maintaining a uniform and stable working temperature of the roller body, avoiding deformation, reduced hardness, weakened strength, and other problems caused by temperature accumulation on the surface of the roller body. The present invention has market prospects and is suitable for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of this application;

[0023] Figure 2 It is a schematic diagram of the internal structure of the roller body proposed in this application;

[0024] Figure 3 A schematic diagram of the internal structure of the heat pipe proposed in this application;

[0025] Figure 4 This is a schematic diagram of the explosion structure of this application;

[0026] Figure 5 It is a schematic diagram of the cross-sectional structure of the heat pipe proposed in this application;

[0027] Figure 6 It is a schematic diagram of the structure of the drive shaft and the heat insulation tube proposed in this application;

[0028] Figure 7 It is a schematic diagram of the structure of the thermal insulation pipe proposed in this application;

[0029] Figure 8 It is a schematic diagram of the cross-sectional structure of this application;

[0030] Fig. 9 for Figure 8 The enlarged structural diagram of the middle A part;

[0031] Fig.10 It is a schematic diagram of the positions of the heat dissipation fins and the heat conduction fins when the thermal expansion mechanism proposed in the present application is not expanded;

[0032] Fig.11 It is a schematic diagram of the gas flow direction inside the roller body when the thermal expansion mechanism proposed in this application is not expanded;

[0033] Fig.12 It is a schematic diagram of the positions of the heat dissipation fins and the heat conduction fins when the thermal expansion mechanism proposed in this application expands;

[0034] Fig.13 It is a schematic diagram of the gas flow direction inside the roller body when the thermal expansion mechanism proposed in this application is not expanded;

[0035] Fig.14 It is a structural schematic diagram of the driving mechanism proposed in this application;

[0036] Fig.15 It is a schematic diagram of the rotation state of the driving mechanism proposed in this application;

[0037] Fig.16 for Fig.15 Schematic diagram of the enlarged structure of part B in the middle.

[0038] Description of the numbers in the figure:

[0039] 1. Roller body; 101. Heat exchange chamber; 11. First air inlet; 12. Heat dissipation fins; 121. Thermal conductive coating; 2. Drive shaft; 21. Discharge channel; 22. Limiting slide groove; 23. Internal connecting ring; 24. Internal valve plate; 3. Heat conduction pipe; 301. Air inlet channel; 302. Internal air duct; 303. Annular air duct; 304. Internal through hole; 31. Second air inlet; 32. Thermal conductive fins; 33 , outer hole; 34, limit block; 4, insulation tube; 401, outer chamber; 402, inner chamber; 403, mixing chamber; 41, ball groove; 411, rotating seat; 42, external ring; 43, outer valve plate; 5, electromagnetic coil; 6, driving mechanism; 601, air guide groove; 61, main blade; 611, insulation coating; 62, auxiliary blade; 63, rotating ring; 7, thermal expansion mechanism; 8, tension spring. DETAILED DESCRIPTION

[0040] The embodiments will be combined with the drawings in the specification to clearly and completely describe the technical solution of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present application. Example

[0041] The present invention provides an air-cooled electromagnetic induction heating roller, see Figure 1 - Fig.16 , including a roller body 1 fixed between two groups of driving shafts 2, the roller body 1 is made of medium carbon steel by milling, an electromagnetic coil 5 is arranged in the roller body 1, a coaxially arranged heat pipe 3 is also arranged in the roller body 1, a heat insulation pipe 4 is fixed on the inner side of the heat insulation pipe 3, and two groups of electromagnetic coils 5 are symmetrically sleeved on the outer side of the heat insulation pipe 4. Furthermore, a mica tape is wound around the outer side of the electromagnetic coil 5, and a mica sheet insulation layer is arranged between the electromagnetic coil 5 and the heat conduction pipe 3, which can effectively prevent the electromagnetic coil 5 from short circuiting and leakage, thereby improving the safety of the roller body 1;

[0042] The heat conducting pipe 3 is connected between the two sets of driving shafts 2 to reciprocate at a fixed angle. The outer wall of the heat conducting pipe 3 is provided with a plurality of heat conducting fins 32 arranged at equal angles. The inner wall of the roller body 1 is provided with heat dissipation fins 12 corresponding to the heat conducting fins 32. A heat exchange chamber 101 is provided between the heat conducting pipe 3 and the roller body 1. An outer chamber 401 is provided between the heat conducting pipe 3 and the heat insulating pipe 4. An inner chamber 402 is provided inside the heat insulating pipe 4.

[0043] The heat-insulating pipe 4 is provided with a driving mechanism 6 for driving the gas in the heat exchange chamber 101 to circulate in the outer chamber 401, the inner chamber 402 and the outer space of the roller body 1. The connection relationship between the chambers is adjusted by changing the rotation direction of the heat-conducting pipe 3.

[0044] For details, please refer to Figure 5 - Fig.12 A plurality of limit blocks 34 are fixed at equal angles at both ends of the heat conducting tube 3. A limit slot 22 corresponding to the limit block 34 is provided at one end of the driving shaft 2. A thermal expansion mechanism 7 and a tensioning spring 8 are respectively clamped between the limit block 34 and the two ends of the limit slot 22. The tensioning spring 8 has an elastic force that drives the limit block 34 close to the thermal expansion mechanism 7.

[0045] See also Fig.10 - Fig.11 In this embodiment, when the internal temperature of the roller body 1 is in the initial heating state and has not reached the design temperature, the thermal expansion degree of the thermal expansion mechanism 7 is limited, and the tensioning spring 8 maintains its own tension. At this time, the heat pipe 3 rotates clockwise to keep the roller body 1 as a whole isolated from the outside world, preventing the heating temperature of the electromagnetic coil 5 from being lost, thereby improving the heating efficiency.

[0046] See also Fig.12 - Fig.13When the operating temperature inside the roller body 1 is too high, the thermal expansion mechanism 7 begins to expand due to the heat. At this time, the thermal expansion mechanism 7 expands and squeezes the limit block 34, causing the limit block 34 to drive the heat pipe 3 to rotate counterclockwise and compress the tension spring 8. At this time, the roller body 1 is connected to the external space as a whole for air cooling and heat dissipation.

[0047] See also Figure 8 - Fig. 9 In order to improve the heat conduction effect of the heat conducting pipe 3, the heat conducting pipe 3 is made of a high-temperature resistant heat conducting silicone structure as a whole. Since the high-temperature resistant heat conducting silicone is a non-magnetic structure, the heat conducting pipe 3 will not be affected by the electromagnetic coil 5 to generate eddy current heating, thereby avoiding the heat conducting pipe 3 itself heating phenomenon. An annular air duct 303 is provided on the inner side of the middle part of the heat conducting pipe 3. Both sides of the annular air duct 303 are connected with a plurality of inner air ducts 302 arranged at equal angles. The outer side of the circular ring of the annular air duct 303 is provided with a plurality of outer holes 33 arranged at equal angles. The annular air duct 303 is connected with the heat exchange chamber 101 through the outer holes 33. A mixing chamber 403 is further provided between the ends of the heat conducting pipe 3 and the heat insulation pipe 4. One end of the inner air duct 302 away from the annular air duct 303 extends into the mixing chamber 403. An air inlet channel 301 connecting the heat exchange chamber 101 and the mixing chamber 403 is further provided at the end of the heat conducting pipe 3.

[0048] Two groups of symmetrically arranged inner through holes 304 are provided on the inner side of the circular ring of the annular air duct 303 , and the heat exchange chamber 101 is connected to the outer chamber 401 through the inner through holes 304 .

[0049] Furthermore, a plurality of first air inlet holes 11 arranged at equal intervals are provided on the port side of the roller body 1, and a second air inlet hole 31 corresponding to the first air inlet hole 11 is provided at the end of the heat-conducting tube 3; the heat-insulating tube 4 is a ceramic structure, which can effectively prevent leakage between the electromagnetic coil 5 and the heat-insulating tube 4. At the same time, the heat-insulating tube 4 has a heat-insulating effect, which can effectively prevent the temperature generated by the roller body 1 from affecting the operation of the driving mechanism 6. An outer connecting ring 42 is provided at the end of the heat-insulating tube 4, and a discharge channel 21 passing through the axis is provided on the drive shaft 2. An inner connecting ring 23 corresponding to the outer connecting ring 42 is provided on the drive shaft 2. An outer valve plate 43 is also fixed inside the outer connecting ring 42. The outer valve plate 43 extends into the discharge channel 21 of the drive shaft 2, and an inner valve plate 24 corresponding to the outer valve plate 43 is provided in the discharge channel 21; a plurality of through holes evenly distributed at equal angles are provided on the inner connecting ring 23 and the outer connecting ring 42, and on the outer valve plate 43 and the inner valve plate 24.

[0050] For details, please refer to Fig.10 - Fig.11When the tension spring 8 is in a free state, that is, when the thermal expansion mechanism 7 is not expanded by high temperature, the heat conducting tube 3 and the heat insulating tube 4 rotate counterclockwise by a fixed angle. At this time, the heat conducting fins 32 are displaced to the middle of the two groups of heat dissipating fins 12, and at this time, the second air inlet hole 31 and the first air inlet hole 11, the outer valve plate 43 and the through holes on the inner valve plate 24 are offset and closed, and the through holes on the inner connecting ring 23 and the outer connecting ring 42 overlap and are open.

[0051] In this state, the roller body 1 is isolated from the external space as a whole. The roller body 1 is subjected to the heat generated by electromagnetic induction of the electromagnetic coil 5. Driven by the driving mechanism 6, the heat circulates between the heat exchange chamber 101, the outer chamber 401 and the inner chamber 402, thereby making the electromagnetic coil 5 generate heat evenly as a whole, thereby preventing the phenomenon of uneven heating of the roller body 1 leading to deterioration of rolling quality.

[0052] See also Fig.12 - Fig.13 When the tension spring 8 is in a compressed state, that is, when the thermal expansion mechanism 7 is expanded by high temperature, the heat conducting tube 3 and the heat insulating tube 4 rotate clockwise at a fixed angle. At this time, the heat dissipating fins 12 are in conflict with the heat conducting fins 32, and at this time, the second air inlet hole 31 and the first air inlet hole 11, the outer valve plate 43 and the through hole on the inner valve plate 24 coincide with each other and are open, the through holes on the inner connecting ring 23 and the outer connecting ring 42 are misaligned and closed, and the side of the heat dissipating fin 12 in conflict with the heat conducting fin 32 is fixed with a thermal conductive coating 121.

[0053] In this state, on the one hand, the heat dissipation fins 12 are in conflict with the heat-conducting fins 32, and the heat on the heat dissipation fins 12 is quickly introduced into the heat-conducting tube 3 by means of the thermal conductive coating 121, so as to achieve the purpose of quickly cooling the roller body 1. On the other hand, the roller body 1 is connected with the external space as a whole. The heat generated by the electromagnetic induction of the electromagnetic coil 5 is driven by the driving mechanism 6, and absorbs the external cold air through the inner air duct 302 and the heat exchange chamber 101 respectively and enters the inner chamber 402, and is then discharged from the discharge channel 21. In this process, the cold air sucked in by the first air inlet 11 exchanges heat with the roller body 1 and the heat-conducting tube 3 respectively, and the roller body 1 and the heat-conducting tube 3 are synchronously cooled by air.

[0054] It should be noted that in the present application, the thermal expansion mechanism 7 is made of thermal expansion silicone rubber, and the opening areas of the first air inlet 11 and the through hole on the outer valve plate 43 are proportional to the expansion degree of the thermal expansion mechanism 7. Therefore, the overall air-cooled heat dissipation efficiency of the roller body 1 is proportional to the temperature of the roller body 1, thereby achieving the purpose of adaptive adjustment of the heat dissipation efficiency.

[0055] See also Figure 7 and Fig.14 - Fig.16 It should be noted that a ball groove 41 is provided in the middle of the insulation tube 4, and a rotating seat 411 is provided on both the upper and lower sides of the ball groove 41;

[0056] The driving mechanism 6 includes a plurality of main blades 61 arranged at equal angles, and auxiliary blades 62 are fixed on the upper and lower sides of the main blades 61. A rotating ring 63 matching the rotating seat 411 is provided on the outer sides of the plurality of auxiliary blades 62 at the same end, and the driving mechanism 6 is rotatably connected to the rotating seat 411 via the rotating ring 63.

[0057] Among them, the rotation axis of the driving mechanism 6 intersects with the axis of the insulation tube 4 and is arranged vertically, the axes of the two groups of electromagnetic coils 5 are respectively arranged on both sides of the rotation axis of the driving mechanism 6, and an air guide groove 601 is also provided at the connection node between the main blade 61 and the auxiliary blade 62. The air guide groove 601 is used to connect the outer warehouse 401 and the inner warehouse 402. The end of the auxiliary blade 62 away from the main blade 61 is arranged opposite to the inner through hole 304. The driving mechanism 6 is arranged between the ends of the two groups of electromagnetic coils 5. Permanent magnets with different magnetic poles are respectively provided on both sides of the main blade 61. In order to prevent the permanent magnet from demagnetizing due to heat, the outer wall of the permanent magnet is also coated with a thermal insulation coating 611. Combined with the overall thermal insulation protection of the insulation tube 4 with a ceramic structure, the temperature of the permanent magnet on the main blade 61 can be effectively reduced.

[0058] In this embodiment, the electromagnetic coil 5 can be connected to AC and DC at different times. When heating is required, AC is connected. When AC is connected, since the magnitude and direction of AC change periodically with time, a changing magnetic field can be generated. When AC passes through the electromagnetic coil 5, an alternating magnetic field is generated in the surrounding space. The alternating magnetic field can generate eddy currents in the magnetically conductive roller body 1, and the eddy currents cause the roller body 1 to heat up.

[0059] Direct current is connected when heat dissipation is required. When direct current is connected, the magnetic field generated by the direct current is constant, and effective eddy currents cannot be generated in the roller body 1, and electromagnetic induction heating cannot be achieved. At this time, the fixed magnetic field generated by the two groups of electromagnetic coils 5 can be used in conjunction with the permanent magnet on the main blade 61 to drive the drive mechanism 6 to rotate. Specifically, in the present embodiment, the magnetic poles at the opposite ends of the two groups of electromagnetic coils 5 are the same. Since the axes of the two groups of electromagnetic coils 5 are respectively arranged on both sides of the rotating shaft of the drive mechanism 6, the end magnetic fields generated by the two groups of electromagnetic coils 5 have overlapping parts and non-overlapping parts. The magnetic field generated by the non-overlapping part pushes the permanent magnets with the same magnetic properties on the main blade 61 to displace, thereby achieving rotation. Since the direction and size of the magnetic field of the electromagnetic coil 5 driven by direct current can be changed at will, the rotation direction and rotation speed of the drive mechanism 6 can be adjusted.

[0060] The present invention is provided with a heat-conducting pipe 3 and a heat-insulating pipe 4, and utilizes an electromagnetic coil 5 to drive a driving mechanism 6 to rotate. Before reaching the design temperature, the roller body 1 can be internally sealed to improve the heating efficiency. When the design temperature is reached, the roller body 1 is connected to the outside, and the heat conduction of the heat-conducting pipe 3 is utilized to quickly absorb the temperature of the roller body 1, and the heat-conducting pipe 3 and the roller body 1 are synchronously cooled and dissipated by external cold air, thereby maintaining a uniform and stable working temperature of the roller body 1, avoiding deformation, reduced hardness, weakened strength, and other problems caused by temperature accumulation on the surface of the roller body 1. The present invention has market prospects and is suitable for popularization and application.

[0061] The above is only the best implementation method adopted by this application in combination with current actual needs, but the protection scope of this application is not limited to this.

Claims

1. An air-cooled electromagnetic induction heating roller, comprising a roller body (1) fixed between two sets of drive shafts (2), wherein an electromagnetic coil (5) is arranged inside the roller body (1), characterized in that: A coaxially arranged heat conducting pipe (3) is also provided in the roller body (1), a heat insulating pipe (4) is fixed on the inner side of the heat conducting pipe (3), and the two groups of electromagnetic coils (5) are symmetrically sleeved on the outer side of the heat insulating pipe (4); The heat-conducting pipe (3) is connected between the two sets of driving shafts (2) so as to reciprocate at a fixed angle; the outer wall of the heat-conducting pipe (3) is provided with a plurality of heat-conducting fins (32) arranged at equal angles; the inner wall of the roller body (1) is provided with heat-dissipating fins (12) corresponding to the heat-conducting fins (32); a heat exchange chamber (101) is provided between the heat-conducting pipe (3) and the roller body (1); an outer chamber (401) is provided between the heat-conducting pipe (3) and the heat-insulating pipe (4); and an inner chamber (402) is provided inside the heat-insulating pipe (4); The heat-insulating pipe (4) is provided with a driving mechanism (6) for driving the gas in the heat exchange chamber (101) to circulate in the outer chamber (401), the inner chamber (402) and the outer space of the roller body (1); A ball groove (41) is provided in the middle of the heat insulation tube (4), and rotating seats (411) are provided on both the upper and lower sides of the ball groove (41); The driving mechanism (6) comprises a plurality of main blades (61) arranged at equal angles, auxiliary blades (62) being fixed to both upper and lower sides of the main blades (61), and a rotating ring (63) matching the rotating seat (411) being provided on the outer sides of the plurality of auxiliary blades (62) at the same end, and the driving mechanism (6) is rotatably connected to the rotating seat (411) via the rotating ring (63); The rotation axis of the driving mechanism (6) intersects with the axis of the heat insulation tube (4) and is arranged perpendicularly, the axes of the two sets of electromagnetic coils (5) are respectively arranged on both sides of the rotation axis of the driving mechanism (6), and an air guide groove (601) is also provided at the connection node between the main blade (61) and the auxiliary blade (62), and the air guide groove (601) is used to connect the outer chamber (401) and the inner chamber (402); The driving mechanism (6) is arranged between the ends of the two groups of electromagnetic coils (5), and permanent magnets with different magnetic poles are respectively arranged on both sides of the main blade (61), and the outer walls of the permanent magnets are also coated with a heat insulation coating (611).

2. The air-cooled electromagnetic induction heating roller according to claim 1, characterized in that: A plurality of limit blocks (34) are fixed at equal angles at both ends of the heat conducting tube (3); one end of the driving shaft (2) is provided with a limit slide groove (22) corresponding to the limit block (34); a thermal expansion mechanism (7) and a tension spring (8) are respectively clamped between the limit block (34) and the two ends of the limit slide groove (22); the tension spring (8) has an elastic force that drives the limit block (34) to approach the thermal expansion mechanism (7).

3. The air-cooled electromagnetic induction heating roller according to claim 2, characterized in that: An annular air duct (303) is provided on the inner side of the middle of the heat conducting pipe (3), and a plurality of inner air ducts (302) arranged evenly at equal angles are connected to both sides of the annular air duct (303). A plurality of outer holes (33) arranged evenly at equal angles are provided on the outer side of the circular ring of the annular air duct (303), and the annular air duct (303) is connected to the heat exchange chamber (101) through the outer holes (33). A mixing chamber (403) is also provided between the ends of the heat conducting pipe (3) and the heat insulation pipe (4), and an end of the inner air duct (302) away from the annular air duct (303) extends into the mixing chamber (403). An air inlet channel (301) connecting the heat exchange chamber (101) and the mixing chamber (403) is also provided at the end of the heat conducting pipe (3); Two groups of symmetrically arranged inner through holes (304) are provided on the inner side of the circular ring of the annular air duct (303), and the heat exchange chamber (101) is connected to the outer chamber (401) via the inner through holes (304).

4. The air-cooled electromagnetic induction heating roller according to claim 3, characterized in that: A plurality of first air inlet holes (11) arranged at equal intervals are provided on the port side of the roller body (1), and a second air inlet hole (31) corresponding to the first air inlet hole (11) is provided at the end of the heat conducting pipe (3); The heat insulation tube (4) is a ceramic structure, an outer connecting ring (42) is provided at the end of the heat insulation tube (4), a discharge channel (21) penetrating along the axis is provided on the drive shaft (2), an inner connecting ring (23) corresponding to the outer connecting ring (42) is provided on the drive shaft (2), an outer valve plate (43) is fixed inside the outer connecting ring (42), the outer valve plate (43) extends into the discharge channel (21) of the drive shaft (2), and an inner valve plate (24) corresponding to the outer valve plate (43) is provided in the discharge channel (21); The inner connecting ring (23), the outer connecting ring (42), the outer valve plate (43) and the inner valve plate (24) are all provided with a plurality of through holes evenly spaced at equal angles.

5. The air-cooled electromagnetic induction heating roller according to claim 4, characterized in that: When the tension spring (8) is in a free state, the heat conducting tube (3) and the heat insulating tube (4) rotate counterclockwise at a fixed angle, and the heat conducting fins (32) are displaced to the middle of the two groups of heat dissipating fins (12). At this time, the second air inlet hole (31) and the first air inlet hole (11), the through holes on the outer valve plate (43) and the inner valve plate (24) are offset and closed, and the through holes on the inner connecting ring (23) and the outer connecting ring (42) overlap and are open.

6. The air-cooled electromagnetic induction heating roller according to claim 5, characterized in that: When the tension spring (8) is in a compressed state, the heat conducting tube (3) and the heat insulating tube (4) rotate clockwise at a fixed angle, and the heat dissipating fins (12) and the heat conducting fins (32) are in conflict with each other. The second air inlet hole (31) and the first air inlet hole (11), the through holes on the outer valve plate (43) and the inner valve plate (24) are overlapped and are in an open state, and the through holes on the inner connecting ring (23) and the outer connecting ring (42) are misaligned and are in a closed state.

7. The air-cooled electromagnetic induction heating roller according to claim 6, characterized in that: A thermal conductive coating (121) is fixed to the side of the heat dissipation fin (12) that contacts the thermal conductive fin (32).

8. The air-cooled electromagnetic induction heating roller according to claim 3, characterized in that: One end of the auxiliary blade (62) away from the main blade (61) is arranged opposite to the inner through hole (304).

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