A direct heating type high-power electromagnetic induction electric drying cylinder system

Abstract

The present application relates to electromagnetic induction drying cylinder technical field, specifically, it relates to a kind of direct heating type high-power electromagnetic induction electric drying cylinder system.It includes high-frequency induction host and metal drying cylinder, high-frequency induction host includes rectifier and filter circuit, full-bridge inverter circuit and induction coil and load module, metal drying cylinder includes drying body and radiator, drying body includes support and cylinder body, support fixedly connected with support bearing, cylinder body coaxially connected with rotating gear, cylinder body other end is equipped with outer sleeve, radiator includes fixed shaft, fixed shaft is equipped with fixed body, fixed body bottom is equipped with high-frequency generator, high-frequency generator is loaded with induction coil.The electromagnetic wave emitted by the induction magnetic field is directly absorbed by the drying cylinder itself in the present application, which causes the metal drying cylinder body to heat directly and be heated;At the same time, since the drying cylinder body itself is a metal material, it also directly shields the induction electromagnetic wave, so there is no need to add an electromagnetic shielding device, saving manufacturing cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic induction drying cylinder, in particular to a direct heating type high-power electromagnetic induction electric drying cylinder system. BACKGROUND

[0002] Most enterprises in the existing weaving industry and papermaking industry use coal, biomass, natural gas and other energy to produce steam, and then inject the steam into the drying cylinder body for indirect heating of the cylinder body, and then dry the cloth and paper, which has low energy utilization rate and large waste. At the same time, in the process of generating steam, a steam boiler and a drying cylinder need to be configured, and the steam boiler and the drying cylinder are prone to explosion and other dangers and accidents as pressure vessels, which requires high safety for enterprises, increases production cost of enterprises and increases workload of government safety management departments.

[0003] In order to respond to the national environmental protection policy and reduce the occupied social management resources, enterprises urgently need an energy-saving and safe drying cylinder, and therefore a direct heating type high-power electromagnetic induction electric drying cylinder system is provided. SUMMARY

[0004] The present application aims to provide a direct heating type high-power electromagnetic induction electric drying cylinder system to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application aims to provide a direct heating type high-power electromagnetic induction electric drying cylinder system, which comprises a high-frequency induction host and a metal drying cylinder. The high-frequency induction host comprises a rectification and filtering circuit, a full-bridge inverter circuit and an induction coil and load module connected in sequence. The rectification and filtering circuit is used to be connected with a power module. The high-frequency induction host further comprises a digital signal processing unit connected with the rectification and filtering circuit and the full-bridge inverter circuit. The metal drying cylinder comprises a drying body and a radiator arranged in the drying body. The drying body comprises a pair of supports and a cylinder body arranged on the top of the supports. The top of the supports is fixedly connected with a support bearing. The two ends of the cylinder body are rotatably connected with the support bearing. One end of the cylinder body is coaxially connected with a rotating gear. The other end of the cylinder body is provided with an outer sleeve. The radiator comprises a fixed shaft located on the central axis of the cylinder body. The fixed shaft penetrates through the outer sleeve. The fixed shaft is rotatably connected with the cylinder body. The surface of the fixed shaft is provided with a fixed body. The bottom of the fixed body is provided with a high-frequency generator. The high-frequency generator is loaded with the induction coil.

[0006] As a further improvement of the present technical solution, the high-frequency induction host further comprises a control cabinet. The digital signal processing unit is connected with the control cabinet through an RS485 communication protocol. The control cabinet is provided with an operation panel.

[0007] As a further improvement of the technical solution, the rectifier and filter circuit comprises diodes D1, D2, D3, D4, D5, D6 and a capacitor C1, wherein one end of the diodes D1, D3 and D5 is connected to the capacitor C1, the capacitor C1 is connected to the diodes D2, D4 and D6, the diode D2 is connected to the other end of the diode D5 and a power supply, the diode D4 is connected to the other end of the diode D1 and a power supply, and the diode D6 is connected to the other end of the diode D3 and a power supply.

[0008] As a further improvement of the technical solution, the full-bridge inverter circuit comprises field effect tubes VT1, VT2, VT3 and VT4, a resistor R, diodes VD1, VD2, VD3 and VD4, an inductor L and a capacitor C2, wherein,

[0009] The capacitor C2 is connected to the field effect tubes VT1 and VT3, the diodes VD1 and VD3 are connected to a positive electrode of a power supply, the field effect tube VT1 is connected to the field effect tube VT2, the diode VD2 and the resistor R, and the other end of the diode VD1, the field effect tube VT3 is connected to the field effect tube VT4, the diode VD4 and the inductor L, and the other end of the diode VD3,

[0010] The diode VD4 is connected to the other end of the field effect tube VT4, the other end of the diode VD2, the other end of the field effect tube VT2 and the other end of the capacitor C2, and the inductor L is connected to the other end of the resistor R.

[0011] As a further improvement of the technical solution, the high-frequency generator is a plurality of "U"-shaped planar coils, and is attached to the inner wall of the cylinder.

[0012] As a further improvement of the technical solution, the high-frequency generator is a non-metallic insulating material.

[0013] As a further improvement of the technical solution, the fixing body comprises a pair of insulating frames, a plurality of horizontal plates perpendicular to the insulating frames are connected between the insulating frames, a plurality of vertical rings parallel to the insulating frames are arranged between the insulating frames, the horizontal plates and the vertical rings are distributed in a cross manner, bottom grooves are formed in the bottom of the insulating frame, the horizontal plate and the vertical ring, and the high-frequency generator is embedded in the bottom groove.

[0014] As a further improvement of the technical solution, the support bearing is provided with a clamping plate away from one side of the cylinder, and the fixed shaft is provided with an anti-rotation fixing seat on the outer surface of the cylinder, and the anti-rotation fixing seat is clamped with the surface of the clamping plate.

[0015] As a further improvement of the technical solution, the fixed shaft surface is provided with a pair of fixed clamps, the bottom of the fixed clamp is connected with the top of the insulating frame, the fixed clamp is a partial annular structure, the top of the fixed clamp is provided with a pressing plate at both ends, and the pressing plates are fixed through bolts.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] 1. In the direct heating type high-power electromagnetic induction electric drying cylinder system, the high-frequency generator is attached to the inner wall of the cylinder body in a "U" shape plane coil, so that the alternating magnetic field generated by the high-frequency generator is uniformly distributed in the cylinder body. When the alternating magnetic force lines in the magnetic field pass through the inner wall of the cylinder body, countless small eddy currents are generated inside, so that the cylinder body itself is heated at high speed, thereby achieving the purpose of heating.

[0018] 2. In the direct heating type high-power electromagnetic induction electric drying cylinder system, the high-frequency generator is embedded in the bottom groove of the insulating frame, horizontal plate and vertical ring, which can uniformly bear stress and avoid the line distortion of the high-frequency generator caused by the magnetic field, thereby realizing the fixation of the high-frequency generator. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a high-frequency induction main circuit structure diagram of the present application.

[0020] Figure 2 It is a metal drying cylinder structure schematic diagram of the present application.

[0021] Figure 3 It is a metal drying cylinder cross-section structure diagram of the present application.

[0022] Figure 4 It is a drying body structure schematic diagram of the present application.

[0023] Figure 5 It is a support structure schematic diagram of the present application.

[0024] Figure 6 It is a cylinder body cross-section structure diagram of the present application.

[0025] Figure 7 It is a radiator structure schematic diagram of the present application.

[0026] Figure 8 It is a fixed shaft structure schematic diagram of the present application.

[0027] Figure 9 It is a fixed body structure schematic diagram of the present application.

[0028] Figure 10 It is a high-frequency generator structure schematic diagram of the present application.

[0029] Figure 11Rectification and filter circuit diagram of the present application;

[0030] Figure 12 Full-bridge inverter circuit diagram of the present application.

[0031] The meanings of various reference numerals in the drawings are as follows:

[0032] 11, drying body; 111, support; 112, support bearing; 113, clamping plate; 12, radiator; 121, fixed shaft; 122, anti-rotation fixing seat; 123, fixing clamp; 124, bolt; 13, cylinder body; 131, rotating gear; 132, outer sleeve; 14, fixed body; 141, insulating frame; 142, horizontal plate; 143, vertical ring; 15, high-frequency generator. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0035] In addition, in the description of the present application, "a plurality of" means two or more, unless otherwise explicitly and specifically limited.

[0036] Embodiment 1

[0037] Please refer to Figures 1-12The embodiment aims to provide a direct heating type high-power electromagnetic induction electric drying cylinder system, which comprises a high-power high-frequency induction host and a metal drying cylinder. The high-frequency induction host comprises a rectification and filtering circuit, a full-bridge inverter circuit, an induction coil and a load module connected in sequence. The rectification and filtering circuit is used to be connected with a power module. The high-frequency induction host further comprises a digital signal processing unit connected with the rectification and filtering circuit and the full-bridge inverter circuit. The high-frequency induction host is a core component for driving the induction coil as an electromagnetic wave emission carrier to drive the whole system to work. Voltage signals and current signals of an output end of the rectification and filtering circuit are fed back to the digital signal processing unit. Current signals of an output end of the full-bridge inverter circuit are fed back to the digital signal processing unit. The metal drying cylinder comprises a drying body 11 and a radiator 12 arranged in the drying body 11. The drying body 11 comprises a pair of supports 111 and a cylinder body 13 arranged on the top of the supports 111. The top of the support 111 is fixedly connected with a support bearing 112. The two ends of the cylinder body 13 are rotationally connected with the support bearing 112. A rotary gear 131 is coaxially connected with one end of the cylinder body 13. An outer sleeve 132 is arranged at the other end of the cylinder body 13. The radiator 12 comprises a fixed shaft 121 located on the central axis of the cylinder body 13. The fixed shaft 121 passes through the outer sleeve 132 and is rotationally connected with the cylinder body 13. A fixed body 14 is arranged on the surface of the fixed shaft 121. A high-frequency generator 15 is arranged at the bottom of the fixed body 14. The fixed body 14 is used to fix the high-frequency generator 15. The high-frequency generator 15 is loaded with an induction coil.

[0038] In specific use, the control cabinet controls the high-frequency induction host to be powered on. The rectification and filtering circuit converts three-phase power into direct current and then into high-frequency current of 10-40 kHz. The current flowing through the high-frequency generator 15 generates a changing alternating magnetic field. When the alternating magnetic force lines in the magnetic field pass through the cylinder body 13, countless small eddy currents are generated on the inner wall of the cylinder body 13, so that the cylinder body 13 itself is heated at high speed, thereby achieving the purpose of heating. The high-frequency generator 15 itself does not generate heat, and its function is to emit electromagnetic waves. When the electromagnetic waves directly diffuse and radiate in the inner wall of the cylinder body 13, the inner wall of the cylinder body 13 directly absorbs the electromagnetic waves, automatically shields the electromagnetic wave magnetic radiation, and then rapidly causes the cylinder body 13 to heat. The temperature of the cylinder body 13 is controlled at the temperature required for drying cloth and paper and other materials. When heating, the rotation of the cylinder body 13 can be driven by rotating the rotary gear 131. Since the fixed shaft 121 does not rotate itself, the high-frequency generator 15 is stationary in the cylinder body 13 through the fixed body 14, so that the high-frequency generator 15 can heat different parts of the cylinder body 13.

[0039] In this embodiment, in order to facilitate the control of the operation of the high-frequency induction host, the high-frequency induction host further comprises a control cabinet, the digital signal processing unit is connected with the control cabinet through an RS485 communication protocol, and the control cabinet is provided with an operation panel. Through the control cabinet and the operation panel, the working state of the high-frequency induction host can be displayed and controlled in real time, so as to facilitate the control of the operation of the high-frequency induction host.

[0040] In order to rectify and filter the power supply, the rectifying and filtering circuit comprises diodes D1, D2, D3, D4, D5, D6 and a capacitor C1, wherein one end of each of the diodes D1, D3 and D5 is connected to the capacitor C1, the capacitor C1 is connected to the diodes D2, D4 and D6, the diode D2 is connected to the other end of the diode D5 and the power supply, the diode D4 is connected to the other end of the diode D1 and the power supply, and the diode D6 is connected to the other end of the diode D3 and the power supply.

[0041] In the three-phase full-bridge rectifying circuit, the common cathode group and the common anode group are controlled at the same time, wherein the diodes D1 and D4 are connected to phase a, the diodes D3 and D6 are connected to phase b, and the diodes D5 and D2 are connected to phase c; the diodes D1, D3 and D5 form the common cathode group, and the diodes D2, D4 and D6 form the common anode group. During the first period, the voltage of phase a is the highest, the common cathode diode D1 is triggered to conduct, the voltage of phase b is the lowest, and the common anode diode D6 is triggered to conduct. At this time, the current flows out from phase a through the diode D1 and flows into phase b through the diode D6, the transformer a and b work, the current of phase a of the common cathode group is positive, the current of phase b of the common anode group is negative, and the rectified voltage is Ud=Ua-Ub=Uab. After 60°, the second period is entered. At this time, the voltage of phase a is still the highest, the diode D1 continues to conduct, but the voltage of phase c becomes the lowest. At this time, the diode D2 is triggered to conduct, the current changes from phase b to phase c, and the diode D6 is turned off under the reverse voltage. At this time, the current flows out from phase a through the diode D1 and flows back to the power supply c phase through the diode D2, the transformer a and c work, the current of phase a is positive, the current of phase c is negative, and the rectified voltage is Ud=Ua-Uc=Uac. After another 60°, the third period is entered. At this time, the voltage of phase b is the highest, the diode D3 is triggered to conduct, the current changes from phase a to phase b, and the diode D2 of phase c continues to conduct because the voltage is still the lowest. At this time, the transformer b and c work, and the rectified voltage is Ud=Ub-Uc=Ubc.

[0042] In order to convert from direct current to alternating current and filter out harmonics, the full-bridge inverter circuit comprises field effect tubes VT1, VT2, VT3 and VT4, resistors R, diodes VD1, VD2, VD3 and VD4, an inductor L and a capacitor C2, wherein the field effect tubes VT1 and VT3 are connected in series and the field effect tubes VT2 and VT4 are connected in series, the series connection of the field effect tubes VT1 and VT3 is connected in parallel with the series connection of the field effect tubes VT2 and VT4, the diodes VD1 and VD3 are connected in series and the diodes VD2 and VD4 are connected in series, the series connection of the diodes VD1 and VD3 is connected in parallel with the series connection of the diodes VD2 and VD4, the series connection of the field effect tubes VT1 and VT3 is connected in series with the series connection of the diodes VD1 and VD3, the series connection of the field effect tubes VT2 and VT4 is connected in series with the series connection of the diodes VD2 and VD4, the series connection of the field effect tubes VT1 and VT3 and the series connection of the diodes VD1 and VD3 are connected in parallel with the series connection of the field effect tubes VT2 and VT4 and the series connection of the diodes VD2 and VD4, the series connection of the field effect tubes VT1 and VT3 and the series connection of the diodes VD1 and VD3 are connected in series with the inductor L, the series connection of the field effect tubes VT2 and VT4 and the series connection of the diodes VD2 and VD4 are connected in series with the inductor L, the series connection of the field effect tubes VT1 and VT3 and the series connection of the diodes VD1 and VD3 are connected in parallel with the series connection of the field effect tubes VT2 and VT4 and the series connection of the diodes VD2 and VD4, and the series connection of the field effect tubes VT1 and VT3 and the series connection of the diodes VD1 and VD3 are connected in series with the capacitor C2.

[0043] Capacitor C2 connects field effect transistor VT1, VT3, diode VD1, VD3 and connects the positive pole of the power supply, field effect transistor VT1 connects field effect transistor VT2, diode VD2, resistor R and connects the other end of diode VD1, field effect transistor VT3 connects field effect transistor VT4, diode VD4, inductor L and connects the other end of diode VD3;

[0044] Diode VD4 connects the other end of field effect transistor VT4, the other end of diode VD2, the other end of field effect transistor VT2 and connects the other end of capacitor C2, inductor L connects the other end of resistor R.

[0045] The field effect transistor VT1 and VT4 form a pair of bridge arms, the field effect transistor VT2 and VT3 form another pair of bridge arms, the diode VD1-VD4 are freewheeling diodes, a pair of opposite control pulses are added to the base of the field effect transistor VT1 and VT2, the control pulse phases of the base of the field effect transistor VT3 and VT4 are also opposite, the control pulse phase of the base of the field effect transistor VT3 lags behind that of VT1 by an angle θ (0°<θ<180°), the control pulse of the base of the field effect transistor VT1 and VT4 is high, and the field effect transistor VT1 and VT4 are both turned on; the field effect transistor VT1 is high, the field effect transistor VT4 is low, the field effect transistor VT1 is turned on, and the field effect transistor VT4 is turned off, the current flowing through the inductor L suddenly becomes small, the inductor L immediately generates a left negative and right positive electromotive force, the electromotive force forms a current loop through the freewheeling diode VD3, the current path is inductor L right positive→freewheeling diode VD3→field effect transistor VT1→resistor R→inductor L left negative, the current direction is still from left to right, since the field effect transistor VT1 and the freewheeling diode VD3 are both turned on, the field effect transistor VT3 is also high, but since the freewheeling diode VD3 is turned on, the c and e electrodes of the field effect transistor VT3 are equal in voltage, and the field effect transistor VT3 cannot be turned on; the control pulse of the base of the field effect transistor VT2 and VT3 is high, during the initial period, the inductor L has not yet completely released energy, and there is still a left negative and right positive electromotive force, but the field effect transistor VT1 is turned off since the base becomes low, the electromotive force of the inductor L charges the DC side capacitor C through the freewheeling diodes VD3 and VD2, the charging current path is inductor L right positive→freewheeling diode VD3→capacitor C→freewheeling diode VD2→resistor R→inductor L left negative, the turn-on of the freewheeling diodes VD3 and VD2 makes the field effect transistor VT2 and VT3 unable to be turned on; when the field effect transistor VT2 is high and the field effect transistor VT3 is low, the field effect transistor VT2 is turned on and the field effect transistor VT3 is turned off, the current flowing through the inductor L suddenly becomes small, the inductor L immediately generates a left positive and right negative electromotive force, the electromotive force forms a current loop through the freewheeling diode VD4, the current path is inductor L left positive→resistor R→field effect transistor VT2→freewheeling diode VD4→inductor L right negative, the current direction is from right to left, since the field effect transistor VT2 and the freewheeling diode VD4 are both turned on, the field effect transistor VT44 is also high, but since the freewheeling diode VD4 is turned on, the c and e electrodes of the field effect transistor VT4 are equal in voltage, and the field effect transistor VT4 cannot be turned on, the circuit repeats the above working process.

[0046] In order to uniformly release electromagnetic waves, the high-frequency generator 15 is a plurality of "U"-shaped planar coils, and is attached to the inner wall of the cylinder body 13, so that the alternating magnetic field generated by the high-frequency generator 15 is uniformly distributed in the cylinder body 13, when the alternating magnetic force line in the magnetic field passes through the inner wall of the cylinder body 13, it will generate countless small eddy currents inside, so that the cylinder body 13 itself generates high-speed heat, thereby achieving the purpose of heating.

[0047] In order to avoid the damage of the high frequency generator 15 itself, the high frequency generator 15 is made of non-metallic insulating material, and by using the non-metallic insulating material, the problem that the high frequency generator 15 is burned due to the eddy current generated by the high frequency generator 15 itself after the alternating magnetic field generated by the high frequency generator 15 can be avoided.

[0048] In order to facilitate the fixation of the high frequency generator 15, the fixing body 14 comprises a pair of insulating frames 141, a plurality of horizontal plates 142 perpendicular to the insulating frames 141 are connected between the insulating frames 141, a plurality of vertical rings 143 parallel to the insulating frames 141 are arranged between the insulating frames 141, the horizontal plates 142 and the vertical rings 143 are cross-distributed, bottom grooves are arranged at the bottom of the insulating frames 141, the horizontal plates 142 and the vertical rings 143, and the high frequency generator 15 is embedded in the bottom grooves, and by arranging the cross-distributed horizontal plates 142 and vertical rings 143 and embedding the high frequency generator 15 in the bottom grooves of the insulating frames 141, the horizontal plates 142 and the vertical rings 143, the high frequency generator 15 can be uniformly stressed, the line twisting caused by the magnetic field affecting the high frequency generator 15 itself can be avoided, and thus the fixation of the high frequency generator 15 can be realized.

[0049] In order to heat different parts of the cylinder body 13, the supporting bearing 112 is provided with a clamping plate 113 away from one side of the cylinder body 13, the fixed shaft 121 is provided with an anti-rotation fixing seat 122 on the outer surface of the cylinder body 13, the anti-rotation fixing seat 122 is clamped with the surface of the clamping plate 113, and when the rotating gear 131 drives the cylinder body 13 to rotate, the cylinder body 13 cannot drive the internal fixed shaft 121 to rotate, and under the rotation of the cylinder body 13 itself, the cylinder body 13 passes through the high frequency generator 15, so that different parts of the cylinder body 13 can be heated.

[0050] In order to facilitate the connection of the fixing body 14 and the fixed shaft 121, a pair of fixed clamps 123 are arranged on the surface of the fixed shaft 121, the bottom of the fixed clamp 123 is connected with the top of the insulating frame 141, the fixed clamp 123 is partially annular, pressure plates are arranged at the top of the fixed clamp 123, the pressure plates are fixed by the bolts 124, the two pressure plates are fixed by the bolts 124, the fixed clamp 123 is sleeved on the surface of the fixed shaft 121, and thus the fixed connection of the fixing body 14 and the fixed shaft 121 can be facilitated.

[0051] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A direct-fired high-power electromagnetic induction electric drying cylinder system, characterized in that: The high-frequency induction host machine includes rectification and filtering circuit, full-bridge inverter circuit and induction coil and load module connected in sequence, the rectification and filtering circuit is used for connecting with power module, the high-frequency induction host machine further includes digital signal processing unit connected with the rectification and filtering circuit and the full-bridge inverter circuit, the metal drying cylinder includes drying body (11) and radiator (12) arranged in the drying body (11), the drying body (11) includes a pair of supports (111) and cylinder body (13) arranged on the top of the support (111), the top of the support (111) is fixedly connected with support bearing (112), both ends of the cylinder body (13) are rotatably connected with the support bearing (112), one end of the cylinder body (13) is coaxially connected with rotary gear (131), the other end of the cylinder body (13) is provided with sleeve (132), the radiator (12) includes fixed shaft (121) located on the central axis of the cylinder body (13), the fixed shaft (121) penetrates through the sleeve (132), the fixed shaft (121) is rotatably connected with the cylinder body (13), the surface of the fixed shaft (121) is provided with fixed body (14), the bottom of the fixed body (14) is provided with high-frequency generator (15), the high-frequency generator (15) is loaded with the induction coil; The rectification and filtering circuit includes diodes D1, D2, D3, D4, D5, D6 and capacitor C1, wherein one end of the diodes D1, D3 and D5 is connected with the capacitor C1, the capacitor C1 is connected with the diodes D2, D4 and D6, the diode D2 is connected with the other end of the diode D5 and the power supply, the diode D4 is connected with the other end of the diode D1 and the power supply, and the diode D6 is connected with the other end of the diode D3 and the power supply; The full-bridge inverter circuit includes field effect tubes VT1, VT2, VT3 and VT4, resistor R, diodes VD1, VD2, VD3 and VD4, inductor L and capacitor C2, wherein The capacitor C2 is connected with the field effect tubes VT1 and VT3, the diodes VD1 and VD3 are connected with the positive electrode of the power supply, the field effect tube VT1 is connected with the field effect tube VT2, the diode VD2 and the resistor R and the other end of the diode VD1, the field effect tube VT3 is connected with the field effect tube VT4, the diode VD4 and the inductor L and the other end of the diode VD3; The diode VD4 is connected with the other end of the field effect tube VT4, the other end of the diode VD2, the other end of the field effect tube VT2 and the other end of the capacitor C2, and the inductor L is connected with the other end of the resistor R. The field effect tube VT1 and VT4 form a pair of bridge arms, the field effect tube VT2 and VT3 form another pair of bridge arms, the diode VD1-VD4 are freewheeling diodes, a pair of opposite control pulses are added to the base of the field effect tube VT1 and VT2, the control pulse phases of the base of the field effect tube VT3 and VT4 are also opposite, the control pulse phase of the base of the field effect tube VT3 lags behind that of VT1 by an angle θ, 0°<θ<180°, the base control pulses of the field effect tube VT1 and VT4 are both high level, and the field effect tube VT1 and VT4 are both turned on; the field effect tube VT1 is high level, the field effect tube VT4 is low level, the field effect tube VT1 is turned on, the field effect tube VT4 is turned off, the current flowing through the inductor L suddenly becomes small, the inductor L immediately generates a left negative and right positive electromotive force, the electromotive force forms a current loop through the freewheeling diode VD3, the current path is inductor L right positive→freewheeling diode VD3→field effect tube VT1→resistor R→inductor L left negative, the current direction is still from left to right, since the field effect tube VT1 and the freewheeling diode VD3 are both turned on, the field effect tube VT3 is also high level, but since the freewheeling diode VD3 is turned on, the c and e electrodes of the field effect tube VT3 are equal in voltage, and the field effect tube VT3 cannot be turned on; the base control pulses of the field effect tube VT2 and VT3 are both high level, during the period, the inductor L has not been able to completely release energy, and there is still a left negative and right positive electromotive force, but the field effect tube VT1 is turned off since the base is low level, the electromotive force of the inductor L charges the DC side capacitor C through the freewheeling diodes VD3 and VD2, the charging current path is inductor L right positive→freewheeling diode VD3→capacitor C→freewheeling diode VD2→resistor R→inductor L left negative, the turn-on of the freewheeling diodes VD3 and VD2 makes the field effect tubes VT2 and VT3 unable to be turned on; when the field effect tube VT2 is high level and the field effect tube VT3 is low level, the field effect tube VT2 is turned on and the field effect tube VT3 is turned off, the current flowing through the inductor L suddenly becomes small, the inductor L immediately generates a left positive and right negative electromotive force, the electromotive force forms a current loop through the freewheeling diode VD4, the current path is inductor L left positive→resistor R→field effect tube VT2→freewheeling diode VD4→inductor L right negative, the current direction is from right to left, since the field effect tube VT2 and the freewheeling diode VD4 are both turned on, the field effect tube VT44 is also high level, but since the freewheeling diode VD4 is turned on, the c and e electrodes of the field effect tube VT4 are equal in voltage, and the field effect tube VT4 cannot be turned on, the circuit repeats the above working process; The high-frequency generator (15) is a plurality of "U" shaped planar coils, and is attached to the inner wall of the cylinder body (13); so that the alternating magnetic field generated by the high-frequency generator (15) is uniformly distributed in the cylinder body (13), when the alternating magnetic force line in the magnetic field passes through the inner wall of the cylinder body (13), it will generate countless small eddy currents inside, so that the cylinder body (13) itself generates high-speed heat; The fixed body (14) comprises a pair of insulating frames (141), a plurality of transverse plates (142) perpendicular to the insulating frames (141) are connected between the insulating frames (141), a plurality of vertical rings (143) parallel to the insulating frames (141) are arranged between the insulating frames (141), the transverse plates (142) and the vertical rings (143) are cross-distributed, bottom grooves are arranged in the bottom of the insulating frames (141), the transverse plates (142) and the vertical rings (143), and the high-frequency generator (15) is embedded in the bottom grooves; the transverse plates (142) and the vertical rings (143) are cross-distributed, and the high-frequency generator (15) is embedded in the bottom grooves of the insulating frames (141), the transverse plates (142) and the vertical rings (143), so that the high-frequency generator (15) can be uniformly stressed, and line distortion caused by the high-frequency generator (15) itself due to the influence of a magnetic field is avoided; The supporting bearing (112) is provided with a clamping plate (113) away from the cylinder body (13), the fixed shaft (121) is provided with an anti-rotation fixing seat (122) on the outer surface of the cylinder body (13), the anti-rotation fixing seat (122) is clamped with the surface of the clamping plate (113), and the cylinder body (13) passes through the high-frequency generator (15) under the rotation of the cylinder body (13) itself, so that different parts of the cylinder body (13) are heated. The surface of the fixed shaft (121) is provided with a pair of fixed clamps (123), the bottom of the fixed clamps (123) is connected with the top of the insulating frames (141), the fixed clamps (123) are partially annular structures, the top of the fixed clamps (123) is provided with pressing plates, and the pressing plates are fixed through bolts (124).

2. The direct-fired high-power electromagnetic induction electrocylinder system according to claim 1, characterized in that: The high-frequency induction host further comprises a control cabinet, the digital signal processing unit is connected with the control cabinet through an RS485 communication protocol, and the control cabinet is provided with an operation panel.

3. The direct-fired high-power electromagnetic induction electrocylinder system according to claim 1, characterized in that: The high-frequency generator (15) is a non-metallic insulating material.

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