Iron core magnetic induction heating and pressurizing production line with optimized layout structure

Abstract

The utility model discloses an iron core magnetic induction heating and pressurizing production line of optimal layout structure, including the collection and transfer device of piece, iron core assembly weighing height -measuring device, first electromagnetic induction heating press, second electromagnetic induction heating press, third electromagnetic induction heating press is arranged from left to right to form the forward arrangement equipment group, and the equipment between forward arrangement equipment group is connected through the forward conveying line, iron core cooling return conveying line and iron core positioning fixture dismounting workstation are arranged from right to left to form the reverse arrangement equipment group, and the first removal machine is arranged between the iron core output end of third electromagnetic induction heating press and the iron core input end of iron core cooling return conveying line of reverse arrangement equipment group right end, and the second removal machine is arranged between the iron core output end of iron core positioning fixture dismounting workstation of reverse arrangement equipment group left end and the collection and transfer device of piece of forward arrangement equipment group left end. The utility model improves the quality and efficiency of iron core manufacturing.

Description

Technical Field

[0001] This utility model relates to the field of iron core manufacturing technology, specifically to an iron core magnetic induction heating and pressurization production line with an optimized layout structure. Background Technology

[0002] The stator and rotor cores of an electric motor include the stator core and the rotor core, both of which are made of silicon steel sheets (core laminations, also known as loose core sheets). Silicon steel sheets are typically stamped on a press using a progressive die.

[0003] In existing technologies, the most common method for fixing the laminated structure of iron core laminations is the riveting method. In this method, the iron core laminations have riveting points stamped on them, and during stacking, adjacent iron core laminations are joined together through these riveting points. However, the presence of these riveting points on the iron core laminations leads to a reduction in the overall magnetic properties of the iron core.

[0004] To improve the magnetic properties of iron cores, adhesive bonding technology is currently used to stack loose iron core sheets. One method involves using self-adhesive coated tape as the material for making the iron core. The tape with the self-adhesive coating film is stamped into loose iron core sheets, then stacked, heated, and cooled to achieve adhesive bonding and curing of the stacked iron core. However, because the self-adhesive coating film requires both heating and cooling processes to fully cure after the iron core sheets are stacked into a loose assembly, insufficient heating may affect the strength of the stacked iron core sheets. Currently, the heating of the loose assembly is completed entirely at the blanking station of the stamping process, but due to cycle time limitations, insufficient heating may occur, affecting the quality of the stacking. Specifically: First, the heating uniformity is insufficient: the heating device of the traditional stamping blanking station can only provide local heat source, resulting in uneven temperature distribution inside the loose component, insufficient curing of the adhesive layer, and affecting the bonding strength. Second, there are limitations in the process cycle: due to the cycle time of the stamping equipment, the heating time of the loose components is difficult to meet the curing requirements of the adhesive material, especially in large-scale continuous production, which can easily lead to batch bonding quality fluctuations. Third, low cooling efficiency: Existing cooling processes mostly use natural cooling or simple air cooling. The cooling rate is not matched with the thickness of the iron core, which may cause micro-cracks in the adhesive layer due to thermal stress, affecting long-term stability.

[0005] Furthermore, traditional production line layouts typically employ a linear arrangement, with material transport between equipment relying on conveyor belts in a single direction. This results in lengthy production processes, large floor space requirements, and difficulty in dynamically adjusting production rhythm. Operators need to frequently intervene at multiple workstations, increasing labor costs and potentially causing product quality fluctuations due to human error. Utility Model Content

[0006] To address the aforementioned problems, this utility model proposes an optimized layout structure for a magnetic induction heating and pressurizing production line for iron cores, aiming to improve the bonding quality of loose iron core sheets and increase the production efficiency of iron core manufacturing. The specific technical solution is as follows: An optimized layout production line for magnetic induction heating and pressurizing of iron cores includes, in sequence according to the iron core magnetic induction heating and pressurizing process, a loose sheet rotation and collection device, a loose sheet collection and transfer device, an iron core assembly weighing and height measuring device, a first electromagnetic induction heating press, a second electromagnetic induction heating press, a third electromagnetic induction heating press, a first transfer machine, an iron core cooling return conveyor line, an iron core positioning fixture disassembly workbench, and a second transfer machine; wherein, the loose sheet collection and transfer device, the iron core assembly weighing and height measuring device, the first electromagnetic induction heating press, the second electromagnetic induction heating press, and the third electromagnetic induction heating press are arranged in a straight line from left to right to form a forward-arranged equipment group, and the equipment in the forward-arranged equipment group is connected by a [missing information - likely a specific type of equipment]. The forward conveyor line is connected to the material conveying line from left to right; the core cooling return conveyor line and the core positioning fixture disassembly workbench are arranged in a straight line from right to left according to the material conveying direction from right to left, thus forming a reverse arrangement equipment group. The forward arrangement equipment group and the reverse arrangement equipment group are arranged parallel to each other and spaced apart. The first transfer machine is arranged between the core output end of the third electromagnetic induction heating press at the right end of the forward arrangement equipment group and the core input end of the core cooling return conveyor line at the right end of the reverse arrangement equipment group. The second transfer machine is arranged between the core output end of the core positioning fixture disassembly workbench at the left end of the reverse arrangement equipment group and the loose piece collection and transfer device at the left end of the forward arrangement equipment group.

[0007] Preferably, the loose piece rotating collection device is arranged in front of the loose piece collecting and transferring device, and a belt conveyor line is arranged between the loose piece rotating collection device and the loose piece collecting and transferring device in the front-to-back direction, thereby forming a B-shaped layout of the entire iron core magnetic induction heating and pressurizing production line.

[0008] The optimized layout of the iron core magnetic induction heating and pressurizing production line of this utility model also includes a punch press for making iron core blanks and an iron core blank stamping progressive die set on the punch press. The blank rotation and collection device is set below the blanking station of the iron core blank stamping progressive die.

[0009] The aforementioned iron core fragments are formed by stamping from a strip with a self-adhesive coating. When collecting the iron core fragments, the rotating collection device can achieve staggered stacking of adjacent fragments by rotating them at a certain angle, thereby reducing the unevenness in the height of the stacked fragment assembly. The rotating collection device is equipped with a heating device to initially bond the stacked fragment assemblies, forming a unified fragment assembly.

[0010] In this invention, the forward conveyor line is a double-speed chain conveyor line that conveys materials from left to right, the core cooling return conveyor line is a double-speed chain conveyor line that conveys materials from right to left, the first transfer machine includes a double-speed chain conveyor line that conveys materials from back to front, and the second transfer machine includes a double-speed chain conveyor line that conveys materials from front to back. During operation, the material moves on the double-speed chain conveyor line via a traveling tooling plate. A cooling support is provided above the core cooling return conveyor line, and a cooling fan is provided on the cooling support to blow air onto the core located on the traveling tooling plate of the core cooling return conveyor line.

[0011] The loose iron core pieces stamped from the punch press are collected by a loose piece rotation and collection device below the blanking station of the stamping progressive die, forming a preliminary stacked and bonded loose piece assembly. Then, it is conveyed to the input end of the forward conveyor line via a belt conveyor line, and subsequently transferred by a loose piece assembly mounting robot to the accompanying tooling plate at the loose piece collection and transfer device position of the forward conveyor line.

[0012] The aforementioned air-cooled supports are multiple and spaced apart on the iron core cooling return conveyor line, thus forming an air-cooling system for the iron core.

[0013] In this invention, the double-speed chain conveyor is provided with guide rails, and the accompanying tooling plate is positioned and moved between a pair of guide rails on the double-speed chain conveyor.

[0014] In this utility model, the lower end of the accompanying tooling plate is provided with a number of conical positioning blind holes, and the iron core assembly weighing and height measuring device includes a first lifting mechanism disposed below the forward conveyor line, an electronic platform scale disposed above the first lifting mechanism, a support plate disposed on the electronic platform scale, and a number of positioning lifting columns disposed on the support plate that are adapted to the conical positioning blind holes at the lower end of the accompanying tooling plate.

[0015] In this invention, the iron core assembly weighing and height measuring device further includes an optical distance measuring probe that is mounted above the forward conveyor line via a height measuring bracket and faces downwards towards the electronic platform scale.

[0016] Preferably, the photoelectric ranging probes are provided in multiple groups, with one group pointing to the upper end face of the iron core and the other group pointing to the upper end face of the traveling tool plate used for positioning the lower end face of the iron core.

[0017] When the aforementioned iron core assembly weighing and height measuring device is in operation, the control system first drives the first lifting mechanism to raise the electronic platform scale, causing the accompanying tooling plate to rise synchronously a certain distance, so that the accompanying tooling plate disengages from the guide rail on the double-speed chain conveyor line, and then weighing is performed. At the same time, the control system measures the height of the loose component assembly mounted on the accompanying tooling plate through a photoelectric ranging probe, thereby realizing the measurement of the weight and height of the loose component assembly of the iron core to determine whether the loose component assembly of the iron core mounted on the accompanying tooling plate meets the requirements. After the test is completed, the first lifting mechanism resets, the accompanying tooling plate resets, and the accompanying tooling plate moves to the first electromagnetic induction heating press for heating and pressurization.

[0018] In this utility model, the first electromagnetic induction heating press, the second electromagnetic induction heating press, and the third electromagnetic induction heating press all include a pressure head that is suspended above the forward conveyor line via a frame, and a second lifting mechanism that is located at the lower part of the frame and below the forward conveyor line for lifting the accompanying tooling plate upward a certain distance.

[0019] The top of the frame is equipped with a servo hydraulic cylinder, and the pressure head is mounted on the piston rod of the servo hydraulic cylinder.

[0020] Preferably, the servo hydraulic cylinder is equipped with a pressure sensor, which, through servo hydraulic control, can promptly adjust for pressure instability caused by heating expansion during the heating process (automatic adjustment) to maintain constant temperature and pressure.

[0021] In this invention, the second lifting mechanism is provided with a number of positioning lifting columns that are adapted to the tapered positioning blind holes at the lower end of the accompanying tooling plate.

[0022] In this utility model, the first electromagnetic induction heating press, the second electromagnetic induction heating press, and the third electromagnetic induction heating press are all equipped with magnetic induction heating devices on their press heads. The magnetic induction heating devices include a magnetic induction heating cylinder cover for covering the iron core, which is disposed on the outer edge of the press head and extends downward, and a magnetic induction heating rod that is vertically disposed at the center of the lower end face of the press head for insertion into the inner hole of the iron core.

[0023] When the aforementioned electromagnetic induction heating press is in operation, the accompanying tooling plate is first lifted upwards by the second lifting mechanism and disengaged from the guide rail of the forward conveyor line. Then, pressure is applied to the iron core by the pressure head, and heating is carried out by the magnetic induction heating device to ensure full contact between adjacent sheets in the iron core and maintain the core density. Simultaneously, the heating by the magnetic induction heating device promotes strong bonding between the sheets. After heating and pressurization are completed, the second lifting mechanism and the accompanying tooling plate are reset, and the accompanying tooling plate moves to the next electromagnetic induction heating press for continued heating and pressurization. After three heating and pressurization cycles, the iron core, along with the accompanying tooling plate, is transferred by the first transfer machine to the iron core cooling return conveyor line for cooling. Depending on the requirements of the electromagnetic induction heating and pressurization of the iron core, different heating powers can be set for the first, second, and third electromagnetic induction heating presses. For example, the heating power of the first, second, and third electromagnetic induction heating presses can be progressively increased.

[0024] In this invention, a loose core assembly installation robot is provided at the output end of the belt conveyor near the loose core rotating collection device for positioning and installing the loose core assembly on a tooling plate located at the position of the loose core rotating collection device on the forward conveyor line.

[0025] Preferably, the accompanying tooling plate is made of a non-stick material to avoid the self-adhesive coating material overflowing after heating, which would cause it to stick to the accompanying tooling plate and become impossible to assemble or disassemble.

[0026] After the iron core has cooled on the iron core cooling return conveyor line, the operator located at the iron core positioning fixture disassembly workbench removes the iron core from the accompanying tooling plate and places the accompanying tooling plate on the second transfer machine. The second transfer machine transfers the empty accompanying tooling plate to the loose piece collection and transfer device on the forward conveyor line, waiting for the loose piece assembly installation robot to position and install the loose pieces of the iron core onto the accompanying tooling plate, thereby realizing the continuous production of iron core magnetic induction heating and pressurization.

[0027] As a further improvement of this utility model, a magnetoresistive modulation dual-frequency heating device is respectively provided inside the magnetic induction heating cylinder and on the magnetic induction heating rod to achieve dual-frequency heating using a magnetoresistive modulation mechanism. The magnetoresistive modulation dual-frequency heating device includes an induction coil wound with a water-cooled copper tube respectively disposed inside the magnetic induction heating cylinder and on the magnetic induction heating rod; a Hall sensor disposed next to the induction coil for real-time detection of the current or magnetic flux information of the induction coil; a number of annular ferrite washers arranged at intervals on the water-cooled copper tube of the induction coil; and a circumferential copper strip covering the outer circumferential surface of the annular ferrite washers. The annular ferrite washers and the circumferential copper strip are provided with radial slits. The circumferential copper strip is broken at the radial slits to form a pair of conductive joints. A semiconductor switching device for switching the pair of conductive joints between the conductive joints in the on and off states is electrically connected between the pair of conductive joints. The Hall sensor and the semiconductor switching device are respectively connected to the control unit.

[0028] Preferably, the semiconductor switching device is a MOSFET module, an IGBT module, or a SiC-MOSFET module.

[0029] Preferably, the circumferential copper strip is directly plated or glued to the outer circular surface of the annular ferrite washer.

[0030] Preferably, the slit width on the annular ferrite and the circumferential copper strip is 1~3mm. By introducing controllable magnetic reluctance through the slit, the magnetic circuit of the system changes from low-resistance closed to adjustable impedance, thereby allowing dynamic changes in the magnetic flux path to be achieved through an external circuit (a semiconductor switching device controlled by a control unit).

[0031] Preferably, the axial spacing between two adjacent annular ferrite washers is 5 mm to 30 mm.

[0032] In this invention, the control unit outputs a high-frequency drive signal based on the detection information of the Hall sensor to control the on / off state of the semiconductor switching device, so that the equivalent magnetic reluctance of the annular ferrite gasket switches between a first magnetic reluctance value and a second magnetic reluctance value within a period T, thereby making the current waveform output by the induction coil contain both low-frequency and high-frequency components, achieving coordinated heating of the deep core and the surface layer.

[0033] Preferably, the period T is 20 μs to 10 ms.

[0034] Preferably, the low-frequency component has a frequency of 50 Hz to 3 kHz and is used for deep heating of the iron core; the high-frequency component has a frequency of 20 kHz to 400 kHz and is used for surface heating of the iron core.

[0035] Preferably, the ratio of high-frequency to low-frequency components can be adjusted by changing the duty cycle of the semiconductor switch: the control unit calculates the instantaneous current value based on the detection signal from the Hall sensor and dynamically adjusts the duty cycle of the semiconductor switch using a PID algorithm. For example, when insufficient high-frequency components are detected, the switching frequency is increased; when excessive low-frequency components are detected, the switching duty cycle is decreased.

[0036] This invention solves the core problems of magnetic property degradation, unstable bonding quality and low production efficiency in traditional iron core manufacturing by integrating process optimization, layout design innovation and intelligent control technology, and provides a reliable technical solution for the large-scale production of high-precision motor iron cores.

[0037] The beneficial effects of this utility model are: First, the optimized layout of the iron core magnetic induction heating and pressurization production line of this utility model uses three specially designed electromagnetic induction heating presses to heat the iron core in stages. The cooling of the iron core is also done in stages, realizing the process optimization of staged heating and coordinated cooling. This reduces the cycle time of each electromagnetic induction heating press, improves the efficiency of the iron core magnetic induction heating and pressurization production line, and the staged pressurization heating of the iron core also improves the bonding quality of the iron core sheets. It can ensure that the iron core sheets are gradually heated and uniformly pressurized during the stacking process, so that the adhesive layer can be cured synchronously from the surface to the depth, and the bonding strength is increased by more than 30%.

[0038] Secondly, the optimized layout structure of the iron core magnetic induction heating and pressurizing production line of this utility model adopts an optimized B-type layout, which makes the production line structure compact and facilitates the operator's monitoring of the entire production line; the equipment layout adopts a parallel arrangement of forward and reverse equipment groups, and by arranging the forward processing equipment group and the reverse cooling equipment group in parallel and spaced apart, a "B"-shaped layout is formed, which shortens the material conveying path, reduces the occupation of idle space between equipment, and reduces the overall production line floor area by 25%.

[0039] Third, the iron core magnetic induction heating and pressurization production line with optimized layout structure of this utility model has a reverse cooling system with dynamic matching: the iron core cooling return conveyor line is equipped with multi-stage air-cooling support. By controlling the cooling air volume and wind speed, the iron core can achieve gradient cooling during movement, effectively avoiding the cracking of the adhesive layer caused by thermal stress concentration. The cooling efficiency is 40% higher than that of the traditional process.

[0040] Fourth, the optimized layout of the iron core magnetic induction heating and pressurizing production line of this utility model adopts a two-way linkage working mode of the transfer machine: the first transfer machine and the second transfer machine are respectively connected to the forward and reverse conveyor lines, realizing the seamless connection of the iron core in the heating and pressurizing section and the cooling section, eliminating the waiting link in the traditional linear layout, and effectively shortening the production cycle of a single iron core.

[0041] Fifth, the optimized layout structure of the iron core magnetic induction heating and pressurization production line of this utility model adopts a double-speed chain conveyor, which makes it convenient for the accompanying tooling plate above the conveyor chain to control the movement rhythm as needed and stop at the required position, thus having good adaptability.

[0042] Sixth, the optimized layout structure of the iron core magnetic induction heating and pressurization production line of this utility model is equipped with an iron core assembly weighing and height measuring device, which can prevent the iron core from being unqualified in height after pressurization and ensure the quality of the iron core.

[0043] Seventh, this utility model provides an optimized layout structure for a magnetic induction heating and pressurizing production line for iron cores. A specially designed magnetoresistive modulation dual-frequency heating device forms a controllable air gap through annular ferrite slits, which works in conjunction with the open and closed loops of the circumferential copper strip. When the circumferential copper strip is closed by a semiconductor switch, a low-resistance eddy current ring is formed. This low-resistance eddy current ring induces eddy currents opposite to the coil current, generating a reverse magnetomotive force, thus forming magnetoresistive force. The total magnetoresistive force of the system is redistributed by the opening or closing of the circumferential copper strip, forming adjustable magnetoresistive force. This allows the current waveform output by the induction coil to include both low-frequency and high-frequency components, thereby achieving coordinated heating of the deep and surface layers of the iron core and improving the uniformity of iron core heating. The magnetoresistive modulation dual-frequency heating device of this invention achieves uniform heating of the iron core from the inside out by controlling the switching of the magnetic circuit, so that the output current of the induction coil includes a low-frequency component of 50Hz~3kHz (deep heating) and a high-frequency component of 20kHz~400kHz (surface heating). The temperature uniformity deviation is ≤±5℃, which is more than 50% better than the temperature distribution uniformity of the traditional single-frequency heating process. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the overall process layout of an iron core magnetic induction heating and pressurization production line with an optimized layout structure according to this utility model; Figure 2 yes Figure 1 A view of the iron core assembly weighing and height measuring device from direction AA; Figure 3 yes Figure 1 BB view of the second electromagnetic induction heating press; Figure 4 yes Figure 1 A CC-direction view of the iron core cooling return conveyor line where an iron core air cooling system is installed; Figure 5 yes Figure 4 A cross-sectional view of the induction coils installed inside the magnetic induction heating cylinder and on the magnetic induction heating rod.

[0045] In the diagram: 1. Iron core, 2. Forward conveyor line, 3. Iron core cooling return conveyor line, 4. Accompanying tooling plate, 5. Air-cooled bracket, 6. Air cooler, 7. Conical positioning blind hole, 8. First lifting mechanism, 9. Electronic platform scale, 10. Support plate, 11. Positioning lifting column, 12. Height measuring bracket, 13. Photoelectric distance measuring probe, 14. Frame, 15. Pressure head, 16. Second lifting mechanism, 17. Servo hydraulic cylinder, 18. Magnetic induction heating device, 19. Magnetic induction heating cylinder cover, 20. Magnetic induction heating rod, 21. Guide rod, 22. Loose component assembly robot, 23. Induction coil (water-cooled copper pipe), 24. Hall sensor, 25. Annular ferrite washer, 26. Circumferential copper strip, 27. Radial slot, 28. Semiconductor switching device, 29. Control unit. Detailed Implementation

[0046] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0047] like Figures 1 to 5 The illustration shows an embodiment of an optimized layout iron core magnetic induction heating and pressurizing production line according to this utility model. It includes a loose piece rotation and collection device, a loose piece collection and transfer device, an iron core assembly weighing and height measuring device, a first electromagnetic induction heating press, a second electromagnetic induction heating press, a third electromagnetic induction heating press, a first transfer machine, an iron core cooling return conveyor line, an iron core positioning fixture disassembly workbench, and a second transfer machine, arranged sequentially from left to right in a straight line to form a forward-arranged equipment group. The equipment is connected by a forward conveyor line that transports materials from left to right; the core cooling return conveyor line and the core positioning fixture disassembly workbench are arranged in a straight line from right to left according to the material transport direction from right to left, thus forming a reverse arrangement equipment group. The forward arrangement equipment group and the reverse arrangement equipment group are arranged parallel to each other and spaced apart. The first transfer machine is arranged between the core output end of the third electromagnetic induction heating press at the right end of the forward arrangement equipment group and the core input end of the core cooling return conveyor line at the right end of the reverse arrangement equipment group. The second transfer machine is arranged between the core output end of the core positioning fixture disassembly workbench at the left end of the reverse arrangement equipment group and the loose piece collection and transfer device at the left end of the forward arrangement equipment group.

[0048] Preferably, the loose piece rotating collection device is arranged in front of the loose piece collecting and transferring device, and a belt conveyor line is arranged between the loose piece rotating collection device and the loose piece collecting and transferring device in the front-to-back direction, thereby forming a B-shaped layout of the entire iron core magnetic induction heating and pressurizing production line.

[0049] An optimized layout iron core magnetic induction heating and pressurizing production line according to this embodiment further includes a punch press for producing iron core blanks and an iron core blank stamping progressive die set on the punch press. The blank rotation and collection device is located below the blanking station of the iron core blank stamping progressive die.

[0050] The aforementioned iron core fragments are formed by stamping from a strip with a self-adhesive coating. When collecting the iron core fragments, the rotating collection device can achieve staggered stacking of adjacent fragments by rotating them at a certain angle, thereby reducing the unevenness in the height of the stacked fragment assembly. The rotating collection device is equipped with a heating device to initially bond the stacked fragment assemblies, forming a unified fragment assembly.

[0051] In this embodiment, the forward conveyor line 2 is a double-speed chain conveyor line that conveys materials from left to right, the core cooling return conveyor line 3 is a double-speed chain conveyor line that conveys materials from right to left, the first transfer machine includes a double-speed chain conveyor line that conveys materials from back to front, and the second transfer machine includes a double-speed chain conveyor line that conveys materials from front to back. During operation, the material moves on the double-speed chain conveyor line via a traveling tooling plate 4. A wind-cooled support 5 is provided above the core cooling return conveyor line 3, and a cold air fan 6 is provided on the wind-cooled support 5 to blow air onto the core located on the traveling tooling plate of the core cooling return conveyor line.

[0052] The loose pieces of iron core 1 stamped from the punch press are collected by the loose piece rotation collection device below the blanking station of the stamping progressive die, forming a preliminary stacked and bonded loose piece assembly. Then, it is conveyed to the input end of the forward conveyor line 2 via a belt conveyor line, and then transferred to the accompanying tooling plate 4 at the position of the loose piece collection and transfer device of the forward conveyor line 2 by the loose piece assembly mounting robot 22.

[0053] The aforementioned air-cooled brackets 5 installed on the iron core cooling return conveyor line 3 are multiple and arranged at intervals on the iron core cooling return conveyor line 3, thereby forming an air-cooling system for the iron core 1.

[0054] In this embodiment, a guide rail is provided on the double-speed chain conveyor line, and the accompanying tooling plate 4 is positioned and moved between a pair of guide rails on the double-speed chain conveyor line.

[0055] In this embodiment, the lower end of the accompanying tooling plate 4 is provided with a number of conical positioning blind holes 7, and the iron core assembly weighing and height measuring device includes a first lifting mechanism 8 disposed below the forward conveyor line 2, an electronic platform scale 9 disposed on the upper end of the first lifting mechanism 8, a support plate 10 disposed on the electronic platform scale 9, and a number of positioning lifting columns 11 disposed on the support plate 10 that are adapted to the conical positioning blind holes 7 at the lower end of the accompanying tooling plate 4.

[0056] In this embodiment, the iron core assembly weighing and height measuring device further includes an photoelectric distance measuring probe 13, which is mounted above the forward conveyor line 2 and faces downwards towards the electronic platform scale 9 via a height measuring bracket 12.

[0057] Preferably, the photoelectric ranging probe 13 is provided in multiple groups and divided into two groups. One group of photoelectric ranging probes 13 points to the upper end face of the iron core 1, and the other group of photoelectric ranging probes 13 points to the upper end face of the accompanying tooling plate 4 used for positioning the lower end face of the iron core 1.

[0058] When the aforementioned iron core assembly weighing and height measuring device is in operation, the control system first drives the first lifting mechanism 8 to raise the electronic platform scale 9, causing the accompanying tooling plate 4 to rise synchronously a certain distance, so that the accompanying tooling plate 4 disengages from the guide rail on the double-speed chain conveyor line, and then weighing is performed. At the same time, the control system measures the height of the loose component assembly installed on the accompanying tooling plate 4 through the photoelectric ranging probe 13, thereby realizing the measurement of the weight and height of the loose component assembly of the iron core 1, in order to determine whether the loose component assembly of the iron core 1 positioned and installed on the accompanying tooling plate 4 meets the requirements. After the test is completed, the first lifting mechanism 8 is reset, the accompanying tooling plate 4 is reset, and the accompanying tooling plate 4 is moved to the first electromagnetic induction heating press for heating and pressurization.

[0059] In this embodiment, the first electromagnetic induction heating press, the second electromagnetic induction heating press, and the third electromagnetic induction heating press all include a press head 15 that is suspended above the forward conveyor line 2 via a frame 14, and a second lifting mechanism 16 that is located below the frame 14 and below the forward conveyor line 2 for lifting the accompanying tooling plate 4 upward a certain distance.

[0060] The top of the frame 14 is provided with a servo hydraulic cylinder 17, and the pressure head 15 is provided on the piston rod of the servo hydraulic cylinder 17.

[0061] Preferably, the servo hydraulic cylinder 17 is equipped with a pressure sensor, which can adjust the pressure instability caused by heating expansion in a timely manner (automatic adjustment) through servo hydraulic control, and maintain constant temperature and pressure.

[0062] In this embodiment, the second lifting mechanism 16 is provided with a number of positioning lifting columns 11 that are adapted to the tapered positioning blind holes 7 at the lower end of the accompanying tooling plate 4.

[0063] In this embodiment, the first electromagnetic induction heating press, the second electromagnetic induction heating press, and the third electromagnetic induction heating press are all equipped with magnetic induction heating devices 18 on their press heads 15. The magnetic induction heating device 18 includes a magnetic induction heating cylinder cover 19 for covering the iron core 1, which is disposed on the outer edge of the press head 15 and extends downward, and a magnetic induction heating rod 20 that is vertically disposed at the center of the lower end face of the press head 15 for insertion into the inner hole of the iron core 1.

[0064] When the aforementioned electromagnetic induction heating press is in operation, the accompanying tooling plate 4 is first lifted upwards by the second lifting mechanism 16 and disengaged from the guide rail of the forward conveyor line 2. Then, the pressure head 15 applies pressure to the iron core 1, and the magnetic induction heating device 18 heats it to ensure sufficient contact between adjacent pieces in the iron core 1, thus maintaining the core density. Simultaneously, the heating by the magnetic induction heating device 18 promotes strong bonding between the pieces. After heating and pressurization, the second lifting mechanism 16 and the accompanying tooling plate 4 are reset, and the accompanying tooling plate 4 moves to the next electromagnetic induction heating press for further heating and pressurization. After three heating and pressurization cycles, the iron core 1, along with the accompanying tooling plate 4, is transferred by the first transfer machine to the iron core cooling return conveyor line 3 for cooling. Different heating powers can be set for the first, second, and third electromagnetic induction heating presses according to the requirements of the electromagnetic induction heating and pressurization of the iron core. For example, the heating power of the first electromagnetic induction heating press, the second electromagnetic induction heating press, and the third electromagnetic induction heating press can be increased step by step.

[0065] In this embodiment, a loose component installation robot 22 is provided at the output end of the belt conveyor near the loose component rotation and collection device for positioning and installing the loose component assembly of the iron core 1 on the accompanying tooling plate 4 located at the position of the loose component rotation and collection device on the forward conveyor line 2.

[0066] Preferably, the accompanying tooling plate 4 is made of a non-stick material to avoid the self-adhesive coating material overflowing after heating, which would cause it to stick to the accompanying tooling plate and become impossible to install or remove.

[0067] After the iron core 1 has cooled on the iron core cooling return conveyor line 3, the operator located at the iron core positioning fixture disassembly workbench removes the iron core 1 from the accompanying tooling plate 4 and places the accompanying tooling plate 4 on the second transfer machine. The second transfer machine transfers the empty accompanying tooling plate 4 to the loose piece collection and transfer device of the forward conveyor line 2, waiting for the loose piece assembly installation robot 22 to position and install the loose piece assembly of the iron core 1 onto the accompanying tooling plate, thereby realizing the continuous production of iron core magnetic induction heating and pressurization.

[0068] As a further improvement to this embodiment, a magnetoresistive modulation dual-frequency heating device is respectively provided inside the magnetic induction heating cylinder shroud 19 and on the magnetic induction heating rod, which achieves dual-frequency heating using a magnetoresistive modulation mechanism. The magnetoresistive modulation dual-frequency heating device includes an induction coil 23 wound with a water-cooled copper pipe and respectively disposed inside the magnetic induction heating cylinder shroud 19 and on the magnetic induction heating rod 10; a Hall sensor 24 disposed beside the induction coil 23 for real-time detection of the current or magnetic flux information of the induction coil 23; and a water-cooled copper pipe sleeved on the induction coil 23. The device comprises a plurality of annular ferrite washers 25 arranged at intervals and a circumferential copper strip 26 covering the outer circumferential surface of the annular ferrite washers 25. The annular ferrite washers 25 and the circumferential copper strip 26 are provided with radial slits 27. The circumferential copper strip 26 is broken at the radial slits 27 to form a pair of conductive joints. A semiconductor switching device 28 for switching the pair of conductive joints between the conductive joints in the on and off states is electrically connected between the pair of conductive joints. The Hall sensor 24 and the semiconductor switching device 28 are respectively connected to the control unit 29.

[0069] Preferably, the semiconductor switching device 28 is a MOSFET module, an IGBT module, or a SiC-MOSFET module.

[0070] Preferably, the circumferential copper strip 26 is directly plated or glued to the outer surface of the annular ferrite washer 25.

[0071] Preferably, the slit width on the annular ferrite 25 and the circumferential copper strip 26 is 1~3mm. By introducing controllable magnetic resistance through the slit, the magnetic circuit of the system changes from low resistance closed to adjustable impedance, thereby allowing dynamic changes in the magnetic flux path to be achieved through an external circuit (semiconductor switching device 28 controlled by control unit 29).

[0072] Preferably, the axial distance between two adjacent annular ferrite washers 25 is 5 mm to 30 mm.

[0073] In this embodiment, the control unit 29 outputs a high-frequency drive signal based on the detection information of the Hall sensor 24 to control the on / off state of the semiconductor switching device 28, so that the equivalent magnetic reluctance of the annular ferrite washer 25 switches between a first magnetic reluctance value and a second magnetic reluctance value within a period T, thereby making the current waveform output by the induction coil 23 contain low-frequency components and high-frequency components, realizing the coordinated heating of the deep core heating and the surface heating.

[0074] Preferably, the period T is 20 μs to 10 ms.

[0075] Preferably, the low-frequency component has a frequency of 50 Hz to 3 kHz and is used for deep heating of the iron core; the high-frequency component has a frequency of 20 kHz to 400 kHz and is used for surface heating of the iron core.

[0076] Preferably, the ratio of high-frequency to low-frequency components can be adjusted by changing the duty cycle of the semiconductor switch 28: the control unit 29 calculates the instantaneous current value based on the detection signal from the Hall sensor 24 and dynamically adjusts the duty cycle of the semiconductor switch using a PID algorithm. For example, when insufficient high-frequency components are detected, the switching frequency is increased; when excessive low-frequency components are detected, the switching duty cycle is decreased.

[0077] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A core magnetic induction heating and pressurization production line with an optimized layout structure, characterized in that, The system includes, in sequence according to the process of magnetic induction heating and pressurization of the iron core, a loose piece rotation collection device, a loose piece collection and transfer device, an iron core assembly weighing and height measuring device, a first electromagnetic induction heating press, a second electromagnetic induction heating press, a third electromagnetic induction heating press, a first transfer machine, an iron core cooling return conveyor line, an iron core positioning fixture disassembly workbench, and a second transfer machine; wherein, the loose piece collection and transfer device, the iron core assembly weighing and height measuring device, the first electromagnetic induction heating press, the second electromagnetic induction heating press, and the third electromagnetic induction heating press are arranged in a straight line from left to right to form a forward arrangement equipment group, and the equipment in the forward arrangement equipment group is connected by a line that follows the material flow from left to right. The forward conveyor line is connected to the forward conveyor line; the core cooling return conveyor line and the core positioning fixture disassembly workbench are arranged in a straight line from right to left according to the material conveying direction from right to left, thus forming a reverse arrangement equipment group. The forward arrangement equipment group and the reverse arrangement equipment group are arranged parallel to each other at intervals. The first transfer machine is arranged between the core output end of the third electromagnetic induction heating press at the right end of the forward arrangement equipment group and the core input end of the core cooling return conveyor line at the right end of the reverse arrangement equipment group. The second transfer machine is arranged between the core output end of the core positioning fixture disassembly workbench at the left end of the reverse arrangement equipment group and the loose piece collection and transfer device at the left end of the forward arrangement equipment group.

2. The optimized layout structure of the iron core magnetic induction heating and pressurization production line according to claim 1, characterized in that, The loose piece rotating collection device is arranged in front of the loose piece collecting and transferring device, and a belt conveyor line is arranged between the loose piece rotating collection device and the loose piece collecting and transferring device in the front-to-back direction, thereby forming a B-shaped layout of the entire iron core magnetic induction heating and pressurizing production line.

3. The optimized layout structure of the iron core magnetic induction heating and pressurization production line according to claim 1, characterized in that, It also includes a punch press for producing iron core sheets and an iron core sheet stamping progressive die disposed on the punch press, wherein the sheet rotation and collection device is disposed below the blanking station of the iron core sheet stamping progressive die.

4. The optimized layout structure of the iron core magnetic induction heating and pressurization production line according to claim 1, characterized in that, The forward conveyor line is a double-speed chain conveyor line that conveys materials from left to right, and the core cooling return conveyor line is a double-speed chain conveyor line that conveys materials from right to left. The first transfer machine includes a double-speed chain conveyor line that conveys materials from back to front, and the second transfer machine includes a double-speed chain conveyor line that conveys materials from front to back. During operation, the material moves on the double-speed chain conveyor line via a traveling tooling plate. An air-cooling bracket is provided above the core cooling return conveyor line, and a cooling fan is provided on the air-cooling bracket to blow air onto the core located on the traveling tooling plate of the core cooling return conveyor line.

5. The optimized layout structure of the iron core magnetic induction heating and pressurization production line according to claim 4, characterized in that, The lower end of the accompanying tooling plate is provided with a number of conical positioning blind holes. The iron core assembly weighing and height measuring device includes a first lifting mechanism located below the forward conveyor line, an electronic platform scale located above the first lifting mechanism, a support plate located on the electronic platform scale, and a number of positioning lifting columns located on the support plate that are adapted to the conical positioning blind holes at the lower end of the accompanying tooling plate.

6. The optimized layout structure of the iron core magnetic induction heating and pressurization production line according to claim 5, characterized in that, The iron core assembly weighing and height measuring device also includes an photoelectric distance measuring probe that is mounted above the forward conveyor line via a height measuring bracket and faces downwards towards the electronic platform scale.

7. The optimized layout structure of the iron core magnetic induction heating and pressurization production line according to claim 5, characterized in that, The first electromagnetic induction heating press, the second electromagnetic induction heating press, and the third electromagnetic induction heating press all include a press head that is suspended above the forward conveyor line via a frame, and a second lifting mechanism that is located at the lower part of the frame and below the forward conveyor line for lifting the accompanying tooling plate upward a certain distance.

8. The optimized layout structure of the iron core magnetic induction heating and pressurization production line according to claim 7, characterized in that, The first, second, and third electromagnetic induction heating presses are all equipped with magnetic induction heating devices on their press heads. The magnetic induction heating devices include a magnetic induction heating cylinder cover that is disposed on the outer edge of the press head and extends downward to cover the iron core, and a magnetic induction heating rod that is vertically disposed at the center of the lower end face of the press head for insertion into the inner hole of the iron core.

9. A core magnetic induction heating and pressurization production line with an optimized layout structure according to claim 8, characterized in that, The magnetic induction heating cylinder and the magnetic induction heating rod are respectively equipped with a magnetoresistive modulation dual-frequency heating device that achieves dual-frequency heating using a magnetoresistive modulation mechanism. The magnetoresistive modulation dual-frequency heating device includes an induction coil wound with a water-cooled copper tube, respectively disposed inside the magnetic induction heating cylinder and on the magnetic induction heating rod; a Hall sensor disposed next to the induction coil for real-time detection of the current or magnetic flux information of the induction coil; a number of annular ferrite washers arranged at intervals on the water-cooled copper tube of the induction coil; and a circumferential copper strip covering the outer circumferential surface of the annular ferrite washers. The annular ferrite washers and the circumferential copper strip are provided with radial slits. The circumferential copper strip is broken at the radial slits to form a pair of conductive joints. A semiconductor switching device for switching the pair of conductive joints between the conductive joints in the on and off states is electrically connected between the pair of conductive joints. The Hall sensor and the semiconductor switching device are respectively connected to the control unit.

10. A core magnetic induction heating and pressurization production line with an optimized layout structure according to claim 9, characterized in that, The control unit outputs a high-frequency drive signal based on the detection information from the Hall sensor to control the switching of the semiconductor switching device, so that the equivalent magnetic reluctance of the annular ferrite gasket switches between a first magnetic reluctance value and a second magnetic reluctance value within a period T, thereby making the current waveform output by the induction coil contain both low-frequency and high-frequency components, achieving coordinated heating of the deep core and the surface layer.

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