Composite heat source on-line aluminum strip low heat heating device

Abstract

Composite heat source online aluminum strip low heat heating device, including heating unit and temperature control unit, the heating unit, including electromagnetic drying actuator, also includes composite heat source, heat preservation unit, copper row outflow copper row heated temperature control medium as composite heat source, heat preservation unit heat medium, in turn into composite heat source, heat preservation unit; Realize through, first adopt low heat type electromagnetic induction heating, the main structure greatly simplifies, compared with traditional tunnel type drying equipment with open flame, can satisfy smaller space multiple production line coexist installation, and the volume is greatly reduced; On the other hand, the scheme adopts plane electromagnetic heating actuator, which breaks through the structure of traditional ring or ring type electromagnetic heating coil, and realizes clean, low heat and high efficiency in the heating process, greatly improves the traditional thin plate type aluminum strip online drying equipment line, has great application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of thin aluminum strip heating and drying, in particular to a composite heat source online aluminum strip low-heat heating device. BACKGROUND

[0002] Now the metal motor vehicle license plate is mostly aluminum product, its base material is 0.5-1.5mm sheet structure, and the license plate production process includes aluminum roll feeding-washing-drying-spraying-punching. The washing process needs to use industrial washing agent, and thorough drying must be carried out after washing to ensure the subsequent spraying effect. At present, the aluminum roll feeding machine or unwinding machine realizes slow feeding of the aluminum roll, and the aluminum strip washing device realizes the washing process by setting a washing tank or a washing nozzle. The more commonly used drying equipment is a tunnel type drying equipment. Although the traditional tunnel type drying equipment has good drying effect, it needs to set up a separate heat source, such as oil-fired, coal-fired or gas-fired, etc. Moreover, the drying tunnel of the tunnel type drying equipment corresponds to the discharge end of the washing machine. Due to the continuous discharge, the tunnel drying equipment can only correspond to one washing machine. For small production lines, the utilization rate of the tunnel drying equipment is not high, and it occupies a large area.

[0003] In fact, electromagnetic drying as a means of metal drying also exists in other fields, but the traditional electromagnetic drying equipment cannot be directly used for drying of the product. The reason is that the aluminum strip used for the license plate is 0.5-1.5mm thick, and the aluminum strip is a weak magnetic induction material. When using electromagnetic induction principle to dry the thin aluminum strip, it is inevitable that the temperature of each part of the aluminum strip will be different due to uneven distribution of electromagnetic induction. It is easy to cause warping and deformation due to uneven distribution of internal thermal stress, causing material damage or affecting the subsequent process. On the other hand, one of the advantages of electromagnetic drying is that the temperature rises rapidly. The traditional electromagnetic drying is easy to cause local temperature to be too high, causing local oxidation discoloration, which makes the subsequent material unable to be used. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide a composite heat source online aluminum strip low-heat heating device to solve the problems of large volume of traditional aluminum strip online drying equipment, large production line limited by drying equipment, and traditional electromagnetic heating cannot be used for online thin plate aluminum strip heating.

[0005] The technical scheme is that the composite heat source online aluminum strip low-heat heating device comprises a heating unit and a temperature control unit, the heating unit generates heat for drying the water stains on the surface of the aluminum strip, the temperature control unit is used for controlling the heating unit to maintain a suitable drying temperature, and the device further comprises a feeding channel for the aluminum strip to pass through, the heating unit comprises an electromagnetic drying actuator, the electromagnetic drying actuator comprises a magnetic field generating component for generating an alternating frequency electromagnetic field, the magnetic field generating component comprises a copper bar arranged in a meandering or serpentine shape, the copper bar is electrically connected to an alternating frequency current input terminal, and the copper bar forms a structure in which the meandering or serpentine copper bar generates an alternating frequency electromagnetic field; the temperature control unit comprises a circulation channel located at the position of the magnetic field generating component, the copper bar has a hollow tubular structure, the copper bar is connected to an external pipeline and a container through a circulating pump, and the copper bar forms a structure in which the temperature control medium can circulate through the copper bar, the external pipeline, the container and the circulating pump; the device further comprises a composite heat source, the composite heat source has a box body structure, and the inside of the box body structure circulates the temperature control medium for providing heat; the composite heat source is located at the front end of the feeding channel, and the aluminum strip passes through the composite heat source first and then passes through the feeding channel; the device further comprises a heat preservation unit located above the copper bar, and the heat preservation unit also comprises a channel for circulating the temperature control medium for providing heat; the temperature control medium that flows out of the copper bar after being heated by the copper bar serves as the heat supply medium of the composite heat source and the heat preservation unit, and sequentially enters the composite heat source and the heat preservation unit; the device further comprises a temperature acquisition unit for acquiring the surface temperature of the copper bar, the surface temperature of the aluminum strip passing through and the medium temperature at the composite heat source; the device further comprises a temperature controller, the temperature control unit is provided with standard values of the surface temperature of the copper bar and the surface temperature of the aluminum strip, the temperature acquisition unit acquires temperature information, and the temperature information is compared with the standard values of the surface temperature of the copper bar and the surface temperature of the aluminum strip; when the acquired temperature is lower or higher than the standard values, the power of the circulating pump is increased to increase the flow of the temperature control medium; when the acquired temperature is lower than the standard values, the power of the circulating pump is reduced or maintained to reduce or maintain the flow of the temperature control medium, and the output power of the alternating frequency electromagnetic field of the magnetic field generating component is increased.

[0006] In the above or some embodiments, the composite heat source comprises an upper box body and a lower box body, one end of the upper box body and the lower box body is connected to a common end, the upper box body, the lower box body and the common end are arranged in a three-dimensional distribution serpentine pipeline, and the temperature control medium flows through the serpentine pipeline.

[0007] In the above or some embodiments, a plurality of spaced protruding ribs are arranged on the upper end face of the lower box body, the ribs are arranged in a structure for mounting guide rollers, and the guide rollers support the aluminum strip to be conveyed; and a plurality of heat dissipation fins are arranged on the lower end face of the upper box body, and the heat dissipation fins are arranged in a structure in which a plurality of heat dissipation fins are spaced apart.

[0008] In the above or some embodiments, the feeding channel comprises a plurality of floating rollers arranged in the feeding direction from above, and a horizontally arranged support plate below the floating rollers, the support plate and the floating rollers form a space for the aluminum strip to pass through; the floating rollers are movably installed on the rack, forming a structure for applying pressure to the passing aluminum strip, and the support plate is a structure fixed on the rack.

[0009] In the above or some embodiments, the temperature control unit and the heat soaking unit below the heat preservation unit; the heat preservation unit is composed of floating rollers, and the heat soaking unit is composed of support plates, and the floating rollers and the support plates are made of non-metallic insulating materials; each floating roller comprises a cylindrical shell made of ceramic material, and a core column inside the shell, the core column and the inner wall of the shell form a space for placing a heating pipe spirally wound on the outer surface of the core column, the inlet and outlet of the heating pipe are connected to an external temperature control medium, forming a circulating inlet and outlet structure driven by a circulating power; the inlets and outlets of the plurality of floating rollers are connected to a multi-pipe distributor through flexible pipelines; the support plate is an aluminum oxide ceramic plate, and the support plate is in close contact with the copper bar.

[0010] In the above or some embodiments, the rack comprises vertically arranged mounting plates for mounting the floating rollers, the mounting plates are located on both sides of the copper bar, the mounting plates are provided with "∪" grooves matched with the shaft diameters of the two ends of the floating rollers, and the "∪" grooves are rotatably connected with the floating rollers, forming a structure for each floating roller to roll and press the passing aluminum strip.

[0011] In the above or some embodiments, the alternating current is generated by an inverter circuit, the inverter circuit comprises IGBT, resonance capacitor and transformer, three-phase 380V 50HZ alternating current is rectified by thyristor, passes through an electric reactor and a filter capacitor for filtering, is converted into 530V smooth and stable direct current, and then the 530V direct current is inverted into high-frequency alternating current required by the load through an IGBT module, a resonance capacitor and a transformer.

[0012] In the above or some embodiments, the rack comprises a frame type cubic structure, the middle part of the frame type cubic structure is divided into an upper space and a lower space by a middle beam, the upper space and the lower space are separated by the middle beam and a partition plate, the copper bar is located in the upper space, the copper bar is fixed to the upper surface of the partition plate through an insulating truss, the transformer is fixedly installed on the upper surface of the bottom plate of the lower space, and a resonance capacitor is located above the transformer; a mounting back plate is further arranged in the middle part of the lower space, and the mounting back plate is used for mounting a main control board, an electric reactor, a filter capacitor and a thyristor module.

[0013] The scheme firstly adopts low-heat electromagnetic induction heating, greatly simplifies the main structure, can meet the installation of multiple production lines coexisting in smaller space compared with the traditional tunnel type drying equipment with open fire, and greatly reduces the volume; on the other hand, the scheme adopts a planar electromagnetic heating actuator which breaks through the structure of the traditional annular or annular electromagnetic heating coil, realizes clean, low-heat and high-efficiency effect in the heating process, greatly improves the linear of the traditional thin plate type aluminum strip online drying equipment, and has great application and promotion prospect. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 is a perspective structural schematic view of an embodiment of the present application.

[0015] Fig. 2 is a front view of the embodiment shown in Fig. 1.

[0016] Fig. 3 is a schematic view of the main body structure in the embodiment shown in Fig. 1.

[0017] Fig. 4 is a schematic view of the structure of the composite heat source in the embodiment shown in Fig. 1.

[0018] Fig. 5 is a front view of the composite heat source shown in Fig. 4.

[0019] Fig. 6 is a schematic view of the medium flow of the serpentine pipe of the composite heat source of the present application.

[0020] Fig. 7 is a schematic view of the copper bar structure in an embodiment of the present application.

[0021] Fig. 8 is a schematic view of the structure of the floating roller in an embodiment of the present application.

[0022] Fig. 9 is a circuit schematic diagram of an embodiment of the present application. DETAILED DESCRIPTION

[0023] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0024] In the description of the present application, the meaning of "a plurality of" is two or more than two, unless otherwise explicitly and specifically limited.

[0025] The application adopts the self-heating mode of the aluminum strip to dry the surface of the aluminum strip, and the principle is that high-frequency alternating current generates a high-frequency magnetic field through a magnetic field generating component 100. When the aluminum strip is in a high-frequency alternating magnetic field, according to Faraday's law of electromagnetic induction, an induced electromotive force will be generated in the aluminum strip. Since the resistance of the conductor is very small, a strong induced current is generated. According to Joule-Lenz law, the alternating magnetic field will make the current in the conductor tend to flow on the surface of the conductor, causing skin effect. The density of the instantaneous current is proportional to the frequency, the higher the frequency, the more serious the skin effect, the effective conductive area decreases, and the resistance increases, so that the conductor is rapidly heated. The aluminum strip will face many problems during the electromagnetic heating process, for example, the aluminum strip used for the sign is a thin plate structure with a thickness of 0.5-1.5mm. Generally, the traditional electromagnetic heating adopts a ring coil structure, and the required heating part is placed in the ring coil. The heating speed of the electromagnetic coil is very fast. Since the spatial distribution of the magnetic field of the ring electromagnetic coil is not uniform, the temperature difference of the aluminum strip heating part will be enlarged in a period of time. The temperature difference is easy to cause warping and deformation due to uneven internal thermal stress distribution, causing material damage or affecting the subsequent process. On the other hand, one of the advantages of electromagnetic drying is that the electromagnetic drying is rapidly heated. The traditional electromagnetic drying is easy to cause local oxidation discoloration due to local overheating, which makes the subsequent material unable to be used. If the power is reduced to control the temperature, the drying is not enough due to the large surface area of the aluminum strip and the heat dissipation block, and the problem of water stain remaining in some areas.

[0026] In the scheme, a cabinet type structure rack 400 is adopted, which includes a frame type cubic structure made of aluminum alloy profiles or shaped steel. The middle part of the frame type cubic structure is divided into an upper space 401 and a lower space 402 by a middle beam 403. The upper space is provided with a transparent acrylic cover plate 408, which can observe the drying effect of the aluminum strip surface at any time. The upper space 401 and the lower space 402 are separated by the middle beam 403 and the partition plate 405. The copper bar 101 is located in the upper space 401, and the lower space 402 is further provided with a mounting back plate 407. The upper space forms a space through which the aluminum strip passes.

[0027] In front of the rack is also provided for the installation of composite heat source 800 mounting bracket, the mounting bracket includes table frame 805, the composite heat source 800 includes upper box 801, lower box 802, one end of the upper box 801, lower box 802 is connected to the public end 803, the upper box 801, lower box 802, public end 803 three-dimensional distribution of serpentine pipeline 804, form the structure of temperature control medium along the serpentine pipeline 804 circulation, the upper box 801, lower box 802 one end of the public end 803 inside recessed to form a space for the installation of serpentine pipe, specifically the upper box 801, lower box 802 one end of the public end 803 inside recessed place is provided for fixing the serpentine pipe of the clamping groove.

[0028] In order to further fix the composite heat source 800 and table frame 805, including the fixed seat, the fixed seat includes the connecting frame 806 connected with the table frame 805 at both ends of the composite heat source 800, the connecting frame 806 is fixedly connected between the connecting frame 806 and the connecting frame 806, the connecting frame 806 is extended to form a fixed arm 808 for connecting the upper box 801, both ends of the upper box 801 are provided with a fixed shaft penetrating into the upper box 801, and the fixed shaft is fixedly connected with the fixed arm 808 through bolts, thereby forming the fixation of the composite heat source 800.

[0029] Further in order to facilitate the passage of aluminum strip, the upper end surface of the lower box 802 is provided with a plurality of spaced convex ribs 809, the convex ribs 809 form a structure for installing guide roller 810, and a structure for supporting the aluminum strip by the guide roller 810 is formed; the transverse beam 807 is located at one end of the convex rib to form a structure for rotatingly connecting one end of the shaft end of the guide roller 810, for example, the rotating connection can be realized by bearing or through hole, and the other end of the guide roller 810 is rotatably connected with the inner side surface of the public end 803. A plurality of rotatably connected rollers are provided on the guide roller, and the rollers are partially exposed on the upper end surface of the convex rib to form a structure for contacting and cooperating with the aluminum strip.

[0030] The composite heat source 800 adopts a semi-closed structure, in order to further realize the preheating effect of the composite heat source 800 on the aluminum strip, the lower end surface of the upper box 801 is provided with a heat dissipation fin 811, and the heat dissipation fin 811 forms a structure in which a plurality of heat dissipation fins are spaced apart.

[0031] The alternating current in the scheme is generated by an inverter circuit, which includes a three-phase full-bridge inverter circuit composed of IGBT, resonance capacitor 500, and transformer 600. Three-phase 380V 50HZ alternating current is rectified by thyristor, reactor, and filter capacitor, and is converted into 530V smooth and stable direct current as the input circuit of the three-phase full-bridge inverter circuit. Then, the 530V direct current is inverted into high-frequency alternating current required by the load through the IGBT module, resonance capacitor 500, and transformer 600. The high-frequency alternating current is induced by the secondary coil of the transformer 600 and transmitted to the copper bar 101. In order to control and set parameters, the scheme also includes an operation panel 700 installed on one side of the rack through a stand.

[0032] In the above or some embodiments, the copper bar 101 is fixed on the upper surface of the partition plate 405 through the insulating truss 404, which can be made of insulating engineering plastic. The copper bar 101 can be fixed on the insulating truss 404 by a clamp. The transformer 600 is fixedly installed on the upper surface of the bottom plate 406 of the lower space 402, and further includes a resonance capacitor 500 located above the transformer 600. The installation back plate 407 is used to install the main control board, reactor, filter capacitor, and thyristor module.

[0033] Unlike traditional electromagnetic induction heating, the magnetic field generating part 100 of the heating unit in the scheme includes a copper bar 101 arranged in a meander or serpentine shape. The copper bar 101 is arranged in a plane, and its electromagnetic field distribution is in the form of a ring-shaped envelope structure along the arrangement direction of the copper bar 101. When the aluminum strip is heated, the aluminum strip as a plate-shaped structure passes through N electromagnetic fields at the same time. Its structure can be roughly in the form of a long strip-shaped area passing through an electromagnetic field along the arrangement direction of the copper bar 101, forming a structure similar to a strip-shaped area. The wrapped strip-shaped area generates an alternating electric field, and then the disordered movement of electrons in the aluminum strip generates heat, forming a heating process. Since the copper bar 101 in the scheme is arranged in a meander or serpentine shape, in fact, the alternating electromagnetic field formed by it can cover most of the area in the cross-sectional direction of the aluminum strip. Due to the fact that this structure cannot achieve full coverage, its warming speed is slower than that of the traditional ring-shaped electromagnetic heating induction coil.

[0034] In order to better realize the heating of the aluminum strip, and the control of the temperature during the heating process, including the temperature rising speed, the temperature rising amplitude control, also including the feeding channel for the aluminum strip to pass through, the temperature control unit includes a circulating channel at the position of the magnetic field generating component 100, the copper bar 101 is a hollow tubular structure, the copper bar 101 is connected to the container, the circulating pump through the external pipeline, forming a structure that the temperature control medium can circulate through the copper bar 101, the external pipeline, the container, the circulating pump, in order to realize the insulation between the copper bar 101 and the temperature control medium, the inner surface of the copper bar 101 is coated with an insulation layer 102, which can be in the form of hot plastic rubber liquid flowing through the pipeline to cover. The temperature control medium in the scheme can be water and other cooling liquids, the external pipeline and the copper bar can be connected through the connecting head to realize the communication, the container can adopt a water tank, which can be fixedly installed in the internal rack. It also includes a temperature acquisition unit for collecting the surface temperature of the copper bar 101 and the surface temperature of the aluminum strip passed through, and a temperature controller, the temperature control sets and stores the standard value of the surface temperature of the copper bar 101 and the surface temperature of the aluminum strip, each temperature acquisition unit compares the temperature information with the standard value of the surface temperature of the copper bar 101 and the surface temperature of the aluminum strip, when the collected temperature is lower than or higher than the temperature standard value, the circulating pump power is increased to increase the flow of the temperature control medium, when the collected temperature is lower than the temperature standard value, the circulating pump power is reduced or maintained to reduce or maintain the flow of the temperature control medium, while the output power of the magnetic field generating component 100 is increased. The temperature acquisition unit includes a temperature sensor, which is arranged between the copper bar and the insulation truss, and also arranged in the area passed by the aluminum strip, the temperature sensor can adopt a non-contact infrared temperature sensor, such as OTP-638D2 infrared non-contact temperature sensor with a measurement range of-50-700.

[0035] The equipment of the scheme is used online, in order to keep the stability of feeding, and better fit the aluminum strip in the feeding process, the feeding channel includes a plurality of floating rollers 200 arranged along the feeding direction above, and also includes a horizontally arranged supporting plate below the floating rollers 200, the supporting plate floating rollers 200 form a space for the aluminum strip to pass between them, when in use, the aluminum strip passes between the floating rollers 200 and the supporting plate, the floating rollers 200 apply pressure to the aluminum strip, so that it completely fits the supporting plate, the supporting plate completely fits the copper bar 101, on the one hand, controls the cooperation of the alternating electric field generated by the aluminum strip and the copper bar 101, on the other hand, the copper bar 101 will also generate auxiliary heat in the process of generating alternating electric field, the heat conduction performance of the supporting plate can be used to contact the copper bar 101 to realize uniform distribution of temperature, and the aluminum strip can obtain uniform low temperature heating; when installing, the floating rollers 200 are movably installed on the rack 400, forming a structure for applying pressure to the passing aluminum strip, and the supporting plate is a structure fixed on the rack 400. In the above or some embodiments, the rack 400 includes a vertically placed mounting plate for mounting the floating rollers 200, the mounting plate is located on both sides of the copper bar 101, the mounting plate is provided with a "∪" groove matched with the shaft diameter of both ends of the floating roller 200, of course, the "∪" groove is rotatably connected with the floating roller 200, forming a structure of each floating roller 200 rolling the passing aluminum strip.

[0036] The scheme utilizes the copper bar to generate electromagnetic field to realize induction heating and drying of the aluminum strip, the copper bar exists as the main heating element, auxiliary heating is realized through the composite heat source 800 and the heat preservation unit, the copper bar will inevitably self-heat in the process of generating alternating magnetic field, the circulating temperature control medium is used to control the temperature of the copper bar on the one hand, and on the other hand, the heat generated by the copper bar is transmitted to the composite heat source 800 and the heat preservation unit through the temperature control medium, the waste heat of the copper bar is utilized to realize temperature control effect, and the effect of low temperature drying is further enhanced.

[0037] In the above or some embodiments, the temperature control unit further comprises a heat preservation unit above the copper bar 101 and a heat equalization unit below the heat preservation unit; the heat preservation unit is composed of floating rollers 200, and the heat equalization unit is composed of a supporting plate; the floating rollers 200 and the supporting plate are made of non-metallic insulating materials; each floating roller 200 comprises a cylindrical shell 201 made of ceramic material, and further comprises a core column 202 inside the shell 201, a heating pipe 203 being wound around the outer periphery of the core column 202 is formed between the core column 202 and the inner wall of the shell 201, the inlet and outlet of the heating pipe 203 are connected to an external temperature control medium, forming a circulating inlet and outlet structure driven by a circulating power, each heating pipe can be connected in series with the water outlet of the copper bar, forming a structure in which the water heated by the copper bar is further heated by the heating pipe, so that the self-heating of the copper bar is fully utilized; the inlets and outlets of the plurality of floating rollers 200 are connected to a multi-pipe distributor through flexible pipelines; the supporting plate is an alumina ceramic plate, and the supporting plate is in close contact with the copper bar 101.

[0038] In the above or some embodiments, the shell 201 and the core column 202 are an integrated ceramic structure, further comprising an end cover 204 encapsulating one end of the shell 201, the end cover 204 is threadedly connected with the end of the shell 201, the supporting plate is made of alumina ceramic, the heating pipe 203 wound around the outer periphery of the core column 202 is an integral structure, the end cover 204 is provided with a central hole through which a water inlet end 205 and a water outlet end 206 of the heating pipe pass, the water inlet end 205 and the water outlet end 206 pass through a sleeve, and the sleeve and the central hole are rotationally connected through a bearing, the water inlet end 205 and the water outlet end 206 extend to the outside and are connected to the water inlet and outlet ends 206 of a liquid distributor through connectors, in use, the shell and the core column can be rotated to roll and press the aluminum strip; the supporting plate is fixedly installed on the insulating truss 404 by bolts.

[0039] The scheme firstly adopts low-heat electromagnetic induction heating, greatly simplifies the main structure, and can meet the installation of multiple production lines in a small space compared with traditional tunnel-type drying equipment with open flame, and greatly reduces the volume; on the other hand, the scheme adopts a planar electromagnetic heating actuator which breaks through the structure of traditional annular or annular electromagnetic heating coils, and realizes clean, low-heat and high-efficiency effects in the heating process, greatly improving the linear thin plate type aluminum strip online drying equipment of traditional thin plate type aluminum strip online drying equipment, and has great application and promotion prospects.

Claims

1. A composite heat source online low-heat heating device for aluminum strip, comprising a heating unit and a temperature control unit, wherein the heating unit generates heat to dry water stains on the surface of the aluminum strip, and the temperature control unit controls the heating unit to maintain a suitable drying temperature; and further comprising a feeding channel for the aluminum strip to pass through, characterized in that: The heating unit includes an electromagnetic drying actuator, which includes a magnetic field generating component (100) for generating an alternating electromagnetic field. The magnetic field generating component (100) includes a copper busbar (101) arranged in a loop or serpentine pattern. The copper busbar (101) is electrically connected to an alternating current input terminal to form a structure in which an alternating electromagnetic field is generated through the copper busbar (101) arranged in a loop or serpentine pattern. The temperature control unit includes a circulation channel located at the position of the magnetic field generating component (100). The copper busbar (101) is a hollow tubular structure. The copper busbar (101) is connected to the container and the circulation pump through an external pipe, forming a structure in which the temperature control medium can circulate through the copper busbar (101), the external pipe, the container, and the circulation pump. It also includes a composite heat source (800), which is a box-type structure with a temperature-controlled medium for providing heat flowing inside. The composite heat source (800) is located at the front end of the feeding channel, forming a structure in which the aluminum strip first passes through the composite heat source (800) and then through the feeding channel. It also includes a heat insulation unit located above the copper busbar (101), the heat insulation unit also including a channel for the flow of a temperature-controlled medium to provide heat; The temperature-controlled medium that flows out of the copper busbar and is heated by the copper busbar serves as the heating medium for the composite heat source (800) and the insulation unit, and enters the composite heat source (800) and the insulation unit in sequence. It also includes a temperature acquisition unit for collecting the surface temperature of the copper busbar (101), the surface temperature of the aluminum strip it passes through, and the medium temperature at the composite heat source (800), and a temperature controller. The temperature controller is set to store standard values ​​of the surface temperature of the copper busbar (101) and the surface temperature of the aluminum strip. Each of the temperature acquisition units collects temperature information and compares it with the standard values ​​of the surface temperature of the copper busbar (101) and the surface temperature of the aluminum strip. The feeding channel includes multiple floating rollers (200) arranged above along the feeding direction, and a horizontally arranged support plate below the floating rollers (200). The support plate and the floating rollers (200) form a space for the aluminum strip to pass through. The floating rollers (200) are movably mounted on the frame (400) to form a structure that applies pressure to the passing aluminum strip. The support plate is fixed to the frame (400). The temperature control unit also includes a heat equalization unit located below the heat preservation unit; the heat preservation unit is composed of floating rollers (200), and the heat equalization unit is composed of a support plate. Both the floating rollers (200) and the support plate are made of non-metallic insulating materials. Each floating roller (200) includes a cylindrical shell (201) made of ceramic material and a core column (202) located inside the shell (201). A heating tube (203) spirally wound around the outer circumference of the core column (202) is provided between the core column (202) and the inner wall of the shell (201). The inlet and outlet of the heating tube (203) are connected to an external temperature control medium to form a circulating inlet and outlet structure driven by circulating power. The inlet and outlet of multiple floating rollers (200) are connected to a multi-pipe distributor via flexible pipes. The support plate is an alumina ceramic plate and is in close contact with the copper busbar (101). The frame (400) includes a vertically placed mounting plate for mounting floating rollers (200). The mounting plate is located on both sides of the copper busbar (101). The mounting plate is provided with "U" grooves that mate with the shaft diameters at both ends of the floating rollers (200). The "U" grooves are rotatably connected to the floating rollers (200) to form a structure in which each floating roller (200) is rolled by aluminum strip.

2. The composite heat source online aluminum strip low-heat heating device according to claim 1, characterized in that, When the collected temperature is higher than the temperature standard value, the power of the circulating pump is increased to increase the flow rate of the temperature control medium. When the collected temperature is lower than the temperature standard value, the power of the circulating pump is reduced or maintained to reduce or maintain the flow rate of the temperature control medium. At the same time, the output power of the magnetic field generating component (100) is increased to increase the frequency electromagnetic field output power.

3. The composite heat source online aluminum strip low-heat heating device according to claim 2, characterized in that, The composite heat source (800) includes an upper housing (801) and a lower housing (802), with one end of the upper housing (801) and the lower housing (802) connected to a common terminal (803).

4. The composite heat source online aluminum strip low-heat heating device according to claim 3, characterized in that, The upper end face of the lower housing (802) is provided with a plurality of spaced protruding ribs (809), and the ribs (809) form a structure for mounting guide rollers (810), forming a structure in which aluminum strip is supported by guide rollers (810); the lower end face of the upper housing (801) is provided with heat dissipation fins (811), and the heat dissipation fins (811) form a structure in which a plurality of heat dissipation fins are spaced apart.

5. The composite heat source online aluminum strip low-heat heating device according to claim 4, characterized in that, The AC current is generated by an inverter circuit, which includes an IGBT, a resonant capacitor (500), and a transformer (600). The three-phase 380V 50HZ AC power is converted into a smooth and stable 530V DC power through a thyristor rectifier, a reactor, and a filter capacitor. Then, the 530V DC power is inverted into the high-frequency AC power required by the load through the IGBT module, the resonant capacitor (500), and the transformer (600).

6. The composite heat source online aluminum strip low-heat heating device according to claim 5, characterized in that, The frame (400) includes a frame-type cubic structure. The frame-type cubic structure is divided into an upper space (401) and a lower space (402) by a middle beam (403). The upper space (401) and the lower space (402) are separated by the middle beam (403) and a partition (405). The copper busbar (101) is located in the upper space (401). The copper busbar (101) is fixed to the upper surface of the partition (405) by an insulating truss (404). The transformer (600) is fixedly installed on the upper surface of the bottom plate (406) of the lower space (402). The frame (400) also includes a resonant capacitor (500) located above the transformer (600). A mounting backplate (407) is also provided in the middle of the lower space (402). The mounting backplate (407) is used to install the main control board, reactor, filter capacitor, and thyristor module.

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