A surface polishing device for a motor stator core

Abstract

This invention discloses a surface grinding device for motor stator cores, belonging to the field of motor stator core grinding technology. It includes a rotary drive component for driving the stator core to rotate, and a surface treatment structure on the rotary drive component. The surface treatment structure includes a grinding assembly and a power component for driving the grinding assembly to rotate. The grinding assembly includes several execution units. During the grinding process of the motor stator core sidewall surface, the insulating coolant filled in the base box mechanism of the execution unit cools the grinding area. This not only effectively extends the service life of the sandpaper assembly in the grinding device but also effectively suppresses irregular thermal expansion of the stator core during grinding, preventing excessive tool feed and ensuring the grinding accuracy of the motor stator core, thus improving the production yield of motor core products.

Description

Technical Field

[0001] This invention relates to the field of motor stator core grinding technology, and more specifically, to a surface grinding device for motor stator cores. Background Technology

[0002] An electric motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. An electric motor consists of a motor housing, a stator assembly, and a rotor assembly. The stator is one of the main components of the motor, typically composed of an iron core and windings. The iron core is usually made of laminated silicon steel sheets to reduce iron losses and improve efficiency. The main function of the stator is to generate a magnetic field, which interacts with the rotor to produce an electromagnetic force that drives the rotor to rotate, thus enabling the motor to operate.

[0003] In motor manufacturing and assembly, the stator assembly needs to be fitted into the motor housing. The housing is typically made of cast aluminum, while the stator core is made of silicon steel or other high-magnetic steel. Therefore, the stator core's hardness is much higher than that of the motor housing. Furthermore, the stator's outer diameter and the motor housing's inner diameter have an interference fit at room temperature, making assembly impossible. The motor housing needs to be heated to a certain temperature to increase its inner diameter. Then, the stator core is lifted, aligned with the motor housing, and placed into the housing for assembly. Therefore, during stator core manufacturing, the outer surface of the stator core needs to be polished to prevent protrusions or burrs on the stator keys. Burrs or protrusions can cause dimensional errors in the stator keys, leading to interference or scraping between the stator core and the inner wall of the motor housing during assembly, resulting in improper assembly.

[0004] Currently, when grinding the surface of a motor core using a grinding device, the high temperature generated at the grinding point not only causes the grinding wheel to wear out quickly, reducing its service life, but also makes the core prone to irregular thermal expansion due to the excessively high temperature. Under such conditions, when the tool is fed normally, the thermal expansion and contraction after the temperature drops will cause the total grinding amount to be greater than originally expected, which is called overfeeding. This results in poor dimensional accuracy and increases the defect rate of the motor core.

[0005] In view of this, we propose a surface grinding device for motor stator core. Summary of the Invention

[0006] Technical problem to be solved: The purpose of this invention is to provide a surface grinding device for motor stator cores, which solves the technical problems mentioned in the background art.

[0007] Technical solution: The technical solution of the present invention provides a surface grinding device for a motor stator core, including a rotary drive component for driving the stator core to rotate, and a surface treatment structure for grinding the side wall surface of the stator core on the rotary drive component.

[0008] The surface treatment structure includes a polishing assembly and a power component that drives the polishing assembly to rotate;

[0009] The polishing assembly includes several execution units arranged in a circular array;

[0010] The execution unit includes two cold plate mechanisms and a bottom box mechanism with an open end. A flexible sealing membrane is connected to the open end of the bottom box mechanism. The bottom box mechanism is filled with insulating coolant. A heat-conducting sandpaper assembly is laid on the surface of the flexible sealing membrane, and the surface of the flexible sealing membrane abuts against the surface of the sandpaper assembly. The two ends of the sandpaper assembly are fixedly connected to the bottom box mechanism by the two cold plate mechanisms.

[0011] The bottom box mechanism of any execution unit is equipped with a forward and backward reset device that can synchronously extend and retract with the deformation of the flexible sealing membrane;

[0012] The forward / backward reset device includes a moving contact and a stationary contact respectively connected to its free end and fixed end. The stationary contact includes a second touch terminal, a first touch terminal, and a signal unit.

[0013] One of the cold plate mechanisms is equipped with a retractable extension strip component that is connected to the base box mechanism.

[0014] As an optional solution of the technical solution in this invention document, the rotary drive includes an operating table, on which two rotating shafts are symmetrically rotated and connected, and several driving rubber wheels are uniformly sleeved and fixed on the outside of each rotating shaft.

[0015] A power motor is connected to the side wall of the control panel at a position corresponding to one of the rotating shafts, and the output shaft of the power motor is connected to the end of the rotating shaft;

[0016] The side walls of the control panel are also connected to the equipment controller and the base support.

[0017] A linear motor is connected to the base support, a lower base is connected to the moving platform of the linear motor, and a first servo electric cylinder is connected to the top of the lower base.

[0018] The cold plate mechanism includes a hollow thermally conductive pressure plate, the inner cavity of which is filled with insulating coolant.

[0019] As an optional solution to the technical solution of this invention, two second servo electric cylinders are symmetrically provided between the two rotating shafts;

[0020] Each of the two second servo electric cylinders has a support connected to its opposite end, and an end positioning roller is fixed to the top of the support.

[0021] Each of the two second servo cylinders has a support frame connected to its opposite ends, and the end of the support frame away from the second servo cylinder connected to it is connected to the operating table.

[0022] As an optional solution to the technical solution of this invention, the grinding assembly also includes a shaft support, a rotating shaft rotatably connected to the shaft support, and an outer cylinder seat fixedly fitted onto the rotating shaft.

[0023] The bottom of the shaft support is connected to a lifting platform located above the first servo cylinder, and the end of the first servo cylinder away from the lower base is fixedly connected to the bottom of the lifting platform.

[0024] The lifting platform is also connected to a top support;

[0025] Two inclined third servo cylinders are symmetrically connected to the top support, and an upper positioning roller is connected to the end of the third servo cylinder away from the top support.

[0026] As an optional solution to the technical solution of this invention, the power component is fixedly connected to the top of the lifting platform;

[0027] The power component is a second servo motor, and the output shaft of the second servo motor is connected to the end of the rotating shaft.

[0028] As an optional solution of the technical solution in this invention document, the bottom box mechanism includes a mounting frame connected to the outer cylinder base, a strip-shaped bottom box connected to the mounting frame, an advance / retreat reset device disposed inside the strip-shaped bottom box in the corresponding bottom box mechanism, and an external indicator portion provided at the end of the strip-shaped bottom box with the advance / retreat reset device inside.

[0029] A flexible sealing membrane is attached to the end opening of the strip-shaped bottom box, and insulating coolant fills the inside of the strip-shaped bottom box;

[0030] The sandpaper assembly includes a flexible thermally conductive substrate layer, and a polishing layer is provided on the surface of the flexible thermally conductive substrate layer;

[0031] The two ends of the flexible thermally conductive substrate in the sandpaper assembly are fixedly connected to the bottom box mechanism by two hollow thermally conductive pressure plates, and the surface of the flexible sealing film abuts against the surface of the flexible thermally conductive substrate in the sandpaper assembly.

[0032] As an optional solution of the technical solution in this invention document, the advance and retreat reset device also includes a rectangular frame with one end connected to the bottom wall of the inner cavity of the strip-shaped bottom box, and an insulating rod slidably inserted on the other end of the rectangular frame. One end of the insulating rod extends into the inner cavity of the rectangular frame and is connected to a positioning block, while the other end extends out from the end of the rectangular frame and is connected to the inner wall of the flexible sealing membrane.

[0033] A return spring is connected to the end of the positioning block away from the insulating rod, and the end of the return spring away from the positioning seat is connected to the end of the inner cavity of the rectangular frame;

[0034] The moving contact is connected to the side wall at one end of the insulating rod that extends into the inner cavity of the rectangular frame.

[0035] As an optional solution of the technical solution in this invention document, the moving contact is a dynamic metal spring, and the fixed end of the dynamic metal spring is connected to the side wall of one end of the insulating rod that extends into the inner cavity of the rectangular frame.

[0036] Both the second touch terminal and the first touch terminal are connected to the inner wall of the rectangular frame cavity, and the side wall surfaces of the second touch terminal and the first touch terminal are flush with the inner wall surface of the rectangular frame cavity.

[0037] As an optional solution to the technical solution of this invention, the moving contact, the second touch terminal, and the first touch terminal are all electrically connected to the signal unit;

[0038] The signal unit includes a control circuit board connected to the side wall of a rectangular frame, and the control circuit board is equipped with a wireless transmission module;

[0039] When the return spring is in the initial relaxed state, the free end of the dynamic metal spring elastically abuts against the surface of the inner wall of the rectangular frame.

[0040] When the free end of the dynamic metal spring contacts the first touch terminal, the trigger control circuit board controls the wireless transmission module to send a first alarm signal to the device controller.

[0041] When the free end of the dynamic metal spring contacts the second touch terminal, the trigger control circuit board controls the wireless transmission module to send a second alarm signal to the device controller.

[0042] As an optional solution of the technical solution in this invention document, the expansion bar component includes a sealing spring, a flow guide bar, a flow guide pipe, and an inclined groove disposed on the side wall of the hollow heat-conducting pressure plate and connected to the inner cavity of the hollow heat-conducting pressure plate and arranged at an inclination. The interior of the inclined groove and the flow guide pipe are also filled with insulating coolant.

[0043] An indicator area is also provided on the side wall of the drainage strip;

[0044] The sealing spring is connected to the inside of the inclined groove, the flow guide is damped and slides in the inclined groove, and the middle of the end of the flow guide inserted into the inclined groove is provided with a connecting part, which is connected to the sealing spring.

[0045] One end of the flow guide pipe is fixedly connected to the end of the corresponding hollow heat-conducting pressure plate, and the other end is fixedly connected to the side wall of the strip-shaped bottom box.

[0046] Beneficial effects: One or more technical solutions provided in this invention have at least the following technical effects or advantages:

[0047] 1. During the grinding process of the side wall surface of the motor stator core through the surface treatment structure, the grinding part can be cooled down by the insulating coolant filled in the bottom box mechanism of the execution unit. This not only effectively improves the service life of the sandpaper assembly in this grinding device, but also effectively suppresses irregular thermal expansion of the stator core during the grinding process, which may lead to excessive tool feed. This ensures the grinding accuracy of the motor stator core and improves the production yield of motor core products.

[0048] 2. Before grinding the motor stator core, the execution unit with an external indicator at its end is rotated to the top of the motor stator core. Then, the execution unit is slowly driven to move downward by the first servo cylinder. When the sandpaper assembly contacts the surface of the core, as the execution unit moves further downward, the flexible sealing membrane, which is pressed along with the sandpaper assembly, deforms. During the retraction of the advance and retreat reset device, which expands and contracts synchronously with the deformed flexible sealing membrane, when the free end of the dynamic metal spring contacts the first touch terminal, the control circuit board triggers the wireless transmission module to send a first alarm signal to the device controller. At this time, the pressure of the execution unit on the surface of the core is within the preset range, thus ensuring the grinding pressure on the surface of the core during the subsequent grinding process, thereby ensuring the grinding effect on the surface of the motor stator core.

[0049] 3. During the grinding process of the motor stator core surface, the frictional heat generated in the grinding area is dissipated to the environment through the heat-conducting sandpaper assembly. The cooling plate mechanism increases the heat dissipation area and improves the heat dissipation effect. Furthermore, during the grinding process, the bottom box mechanism, which is filled with insulating coolant, can also actively cool the grinding area directly through the sandpaper assembly, further improving the cooling and heat dissipation effect of the stator core grinding area. This effectively reduces the probability of irregular thermal expansion caused by excessive temperature in the grinding area of ​​the motor stator core during the grinding process, thereby improving the grinding accuracy of the stator core surface and the production yield of motor core products.

[0050] 4. As the insulating coolant filling the bottom box mechanism continuously absorbs the frictional heat from grinding, its temperature rises. This heat can then be dissipated into the environment through the strip-shaped bottom box, the flexible thermally conductive base layer, and the cold plate mechanism. Furthermore, when the rotating sandpaper assembly contacts the surface of the motor stator core, the flexible sealing membrane, subjected to the core's pressure and undergoing elastic deformation, is injected through the guide pipe in the spreading strip component into the inner cavity of its corresponding hollow thermally conductive pressure plate. The increased hydraulic pressure within the hollow thermally conductive pressure plate drives the sealing spring to undergo elastic deformation. This deformation causes the guide strip to extend a set length from the inclined groove, allowing the spreading strip component to not only detect the action unit's contact with the core surface... Furthermore, during the subsequent rotation of the execution unit, the airflow can be effectively guided to the cold plate mechanism by extending a specific length of guide strip, accelerating the heat exchange between the strip-shaped bottom box, the cold plate mechanism, and the air. This helps to accelerate the cooling efficiency of the insulating coolant filled in the bottom box mechanism during the grinding process of the motor stator core, ensuring the cooling effect of the execution unit on the grinding part of the core surface. This further reduces the probability of irregular thermal expansion caused by excessive temperature in the grinding part of the motor stator core during the grinding process, and further improves the grinding accuracy of the stator core surface.

[0051] 5. During the process of overheating and irregular thermal expansion of the polished part of the iron core surface, which triggers the signal unit to issue an alarm signal, the flexible sealing membrane is further compressed, causing the extension of the guide strip to increase further. This allows more airflow to be introduced during the irregular expansion of the polished part and the triggering of the alarm signal, thereby increasing the heat dissipation area, reducing heat dissipation blind spots, improving the heat dissipation efficiency of the insulating coolant filled in the bottom box mechanism, achieving cooling compensation for the polished part of the iron core surface, effectively suppressing the continuous development of thermal expansion of the polished part of the iron core surface, and controlling the thermal expansion deformation of the polished part within a controllable range.

[0052] 6. When the surface treatment structure continuously grinds the surfaces of multiple motor stator cores for an extended period, causing an abnormal rise in the temperature of the insulating coolant filling the bottom box mechanism, and consequently reducing the cooling effect of the execution unit on the ground core surface, the irregular thermal expansion of the ground core surface exceeds the preset critical upper limit. This causes further compression of the flexible sealing film. As the retracting reset device, which expands and contracts synchronously with the deformed flexible sealing film, retracts further, the free end of the dynamic metal spring contacts the second touch terminal. This triggers the control circuit board to control the wireless transmission module to send a second alarm signal to the equipment controller, reminding the operator to stop the machine in time. This prevents excessive cutting and ensures the grinding accuracy of the motor stator core surface, thus guaranteeing the grinding accuracy of the core surface.

[0053] 7. Before grinding the motor stator core, as the actuator gradually applies pressure to the core surface and reaches the preset pressure, the flexible sealing membrane, which is pressed along with the sandpaper assembly, undergoes elastic deformation. The insulating coolant inside the strip-shaped bottom box is continuously squeezed into the hollow heat-conducting pressure plate cavity through the guide pipe, driving the sealing spring to expand elastically. The deformed sealing spring drives the guide strip to extend from the end of the hollow heat-conducting pressure plate. When the dynamic metal spring contacts the second touch terminal and the operator receives the first alarm signal, if the indicator area on the guide strip is exposed, it indicates that the elastic performance of the sealing spring is normal. If the indicator area is not exposed or the abnormal extension of the guide strip causes an abnormal amount of extension of the indicator area, the process is considered normal. If the temperature is normal, it indicates that the retaining spring has been undergoing repeated elastic deformation over a long period, causing it to gradually lose its original elastic recovery ability and fail elastically. Alternatively, it may be due to aging failure caused by prolonged use, resulting in leakage of insulating coolant. Timely maintenance is required to prevent the retaining spring from affecting the grinding pressure on the iron core surface due to elastic failure. This also prevents the retaining spring from being torn under rapidly increasing hydraulic pressure during grinding, or from leaking insulating coolant due to aging. This would affect the cooling and heat dissipation effect of the stator iron core grinding area and the cooling compensation effect when the insulating coolant temperature rises abnormally, thus improving the reliability of equipment operation. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0055] Figure 2 This is a side view of the overall structure of the present invention.

[0056] Figure 3 This is a rear view of the overall structure of the present invention.

[0057] Figure 4 For the present invention Figure 3 A magnified view of part A in the diagram.

[0058] Figure 5 For the present invention Figure 3 A magnified view of part B in the diagram.

[0059] Figure 6 For the present invention Figure 5 A magnified view of part C in the diagram.

[0060] Figure 7 This is a schematic diagram of the surface treatment structure in this invention.

[0061] Figure 8 This is a schematic diagram of a partial method of the grinding component in this invention.

[0062] Figure 9 This is a partial cross-sectional view of the grinding component in this invention.

[0063] Figure 10 This is a cross-sectional view of the execution unit in this invention.

[0064] Figure 11 For the present invention Figure 10 A magnified view of part D in the middle.

[0065] Figure 12 For the present invention Figure 10 A magnified view of part E in the middle.

[0066] Figure 13 For the present invention Figure 12 A magnified view of part F in the middle section.

[0067] Figure 14 This is a schematic diagram of the drainage strip in this invention.

[0068] Explanation of the labels in the diagram:

[0069] 101. Control panel; 102. Servo motor; 103. Drive roller; 104. Equipment controller; 105. Linear motor; 106. First servo cylinder; 107. Base support; 108. Support frame; 109. Second servo cylinder; 110. End positioning roller;

[0070] 201. Second servo motor; 202. Top support; 203. Grinding layer; 204. Third servo electric cylinder; 205. Upper positioning roller; 206. Outer cylinder seat; 207. Shaft support; 209. Lifting platform; 210. Hollow heat-conducting pressure plate; 211. Drainage strip; 212. Flexible heat-conducting base layer; 213. Strip-shaped bottom box; 214. Rotating shaft; 215. Mounting frame; 216. Rectangular frame; 217. Insulating coolant; 218. Insulating rod; 219. Control circuit board; 220. Wireless transmission module; 221. Second touch terminal; 223. Dynamic metal spring; 224. Flexible sealing film; 225. Sealing spring; 226. Drainage pipe; 227. External indicator; 228. Connecting part. Detailed Implementation

[0071] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0072] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0073] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a link; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0074] Example 1: Refer to Figures 1 to 10 The present invention provides a surface polishing device for a motor stator core, including a rotary drive for driving the stator core to rotate, and a surface treatment structure for polishing the side wall surface of the stator core.

[0075] The surface treatment structure includes a polishing assembly and a power component 201 that drives the polishing assembly to rotate;

[0076] The polishing assembly includes several execution units arranged in a circular array;

[0077] The execution unit includes two cold plate mechanisms and a bottom box mechanism with an open end. A flexible sealing membrane 224 is connected to the open end of the bottom box mechanism. The bottom box mechanism is filled with insulating coolant 217. A heat-conducting sandpaper assembly is laid on the surface of the flexible sealing membrane 224, and the surface of the flexible sealing membrane 224 abuts against the surface of the sandpaper assembly. The two ends of the sandpaper assembly are fixedly connected to the bottom box mechanism by the two cold plate mechanisms.

[0078] The bottom box mechanism of any execution unit is equipped with a flexible sealing membrane 224 that can extend and retract synchronously to follow deformation;

[0079] The forward / backward reset device includes a moving contact and a stationary contact respectively connected to its free end and fixed end. The stationary contact includes a second touch terminal 221, a first touch terminal 222 and a signal unit, and the moving contact, the second touch terminal 221 and the first touch terminal 222 are all electrically connected to the signal unit.

[0080] One of the cold plate mechanisms is equipped with a retractable extension strip component that is connected to the base box mechanism.

[0081] Reference Figure 2 and Figure 4 This invention provides a surface polishing device for a motor stator core. The rotary drive includes an operating table 101. Two rotating shafts are symmetrically rotatably connected to the operating table 101. Several driving rubber wheels 103 are uniformly sleeved and fixed on the outside of each rotating shaft. The driving rubber wheels 103 are made of rubber material and drive the motor stator core to rotate through friction.

[0082] A power motor 102 is connected to the side wall of the control panel 101 at a position corresponding to one of the rotating shafts, and the output shaft of the power motor 102 is connected to the end of the rotating shaft. The power motor 102 is preferably a servo motor.

[0083] The side wall of the control panel 101 is also connected to the equipment controller 104 and the base support 107 respectively;

[0084] A linear motor 105 is connected to the bottom support 107, a lower base is connected to the moving platform of the linear motor 105, and a first servo electric cylinder 106 is connected to the top of the lower base.

[0085] The cold plate mechanism includes a hollow thermally conductive pressure plate 210, the inner cavity of which is filled with insulating coolant 217. The hollow thermally conductive pressure plate 210 is preferably made of aluminum alloy.

[0086] After the motor stator core to be ground is placed between the left and right rows of drive rollers 103, the top support 202 is moved above the core by the linear motor 105. Then, the surface treatment structure is driven to move down by the first servo cylinder 106. After the grinding pressure of the execution unit is adjusted by the first servo cylinder 106, the third servo cylinder 204 is controlled to extend. When the upper positioning roller 205 is in contact with the core surface, the upper positioning roller 205 can perform a first-level limit treatment on the core to be processed. Then, the power motor 102 is turned on by the equipment controller 104, and the power motor 102 controls the corresponding rotating shaft to rotate, so that the core to be ground can rotate at a low speed. Then, the surface treatment structure is used to grind the surface of the motor stator core.

[0087] During the grinding process of the side wall surface of the motor stator core through the surface treatment structure, the grinding part can be cooled down by the insulating coolant 217 filled in the bottom box mechanism of the execution unit. This not only effectively improves the service life of the sandpaper assembly in this grinding device, but also effectively suppresses irregular thermal expansion of the stator core during the grinding process, which may lead to excessive tool feed. This ensures the grinding accuracy of the motor stator core and improves the production yield of motor core products.

[0088] Reference Figures 1 to 5 , Figure 7 The present invention provides a surface grinding device for motor stator core. The grinding assembly further includes a shaft support 207, a rotating shaft 214 rotatably connected to the shaft support 207, and an outer cylinder seat 206 fixedly fitted onto the rotating shaft 214.

[0089] The bottom of the shaft bracket 207 is connected to the lifting platform 209 located above the first servo cylinder 106, and the end of the first servo cylinder 106 away from the lower base is fixedly connected to the bottom of the lifting platform 209, and the power component 201 is fixedly connected to the top of the lifting platform 209.

[0090] The lifting platform 209 is also connected to the top support 202;

[0091] Two inclined third servo cylinders 204 are symmetrically connected to the top support 202. An upper positioning roller 205 is connected to the end of the third servo cylinder 204 away from the top support 202.

[0092] Reference Figures 1 to 5 This invention provides a surface grinding device for a motor stator core. The power component 201 is an existing device that uses electric power to drive the target structure (such as a shaft, gear, turntable, etc.) to rotate continuously or intermittently around a fixed axis. In this application, the power component 201 is preferably a servo motor, and the output shaft of the servo motor is connected to the end of the rotating shaft 214.

[0093] Reference Figures 7 to 10 This invention provides a surface polishing device for a motor stator core. The base box mechanism includes a mounting frame 215 connected to an outer cylinder seat 206. A strip-shaped base box 213 is connected to the mounting frame 215. An advance / retreat reset device is disposed inside the strip-shaped base box 213 in the corresponding base box mechanism. The end of the strip-shaped base box 213 with the advance / retreat reset device is provided with an external indicator 227. The strip-shaped base box 213 is preferably made of aluminum alloy material, and the external indicator 227 is preferably a colored paint layer disposed on the end of the strip-shaped base box 213.

[0094] The flexible sealing membrane 224 is connected to the end opening of the strip-shaped bottom box 213, and the insulating coolant 217 is filled inside the strip-shaped bottom box 213;

[0095] The sandpaper assembly includes a flexible thermally conductive substrate 212, and a polishing layer 203 is provided on the surface of the flexible thermally conductive substrate 212. The flexible thermally conductive substrate 212 is made of a flexible material with thermal conductivity, and preferably is made of flexible thermally conductive graphite sheet. The polishing layer 203 is made of abrasive with thermal conductivity, and preferably is made of green silicon carbide material with good thermal conductivity.

[0096] The two ends of the flexible thermally conductive substrate 212 in the sandpaper assembly are fixedly connected to the bottom box mechanism by two hollow thermally conductive pressure plates 210, and the surface of the flexible sealing film 224 abuts against the surface of the flexible thermally conductive substrate 212 in the sandpaper assembly.

[0097] During the grinding process of the motor stator core surface, the frictional heat generated in the grinding area is dissipated to the environment through the heat-conducting sandpaper assembly. The cooling plate mechanism increases the heat dissipation area and improves the heat dissipation effect. Furthermore, during the grinding process, the bottom box mechanism, which is filled with insulating coolant 217, can also actively cool the grinding area directly through the sandpaper assembly, further improving the cooling and heat dissipation effect of the stator core grinding area. This effectively reduces the probability of irregular thermal expansion caused by excessive temperature in the grinding area of ​​the motor stator core during the grinding process, thereby improving the grinding accuracy of the stator core surface and the production yield of motor core products.

[0098] Reference Figures 9 to 11 This invention provides a surface grinding device for a motor stator core. The retractable reset device further includes a rectangular frame 216 with one end connected to the bottom wall of the inner cavity of the strip-shaped bottom box 213. An insulating rod 218 is slidably inserted on the other end of the rectangular frame 216. One end of the insulating rod 218 extends into the inner cavity of the rectangular frame 216 and is connected to a positioning block. The other end extends out from the end of the rectangular frame 216 and is connected to the inner wall of the flexible sealing film 224. The rectangular frame 216 and the insulating rod 218 are both made of insulating material. The front and rear sides of the rectangular frame 216 are open, so that the signal unit, the second touch terminal 221, the first touch terminal 222 and the second touch terminal 221 are all immersed in the insulating coolant 217 filled inside the strip-shaped bottom box 213.

[0099] A return spring is connected to the end of the positioning block away from the insulating rod 218, and the end of the return spring away from the positioning seat is connected to the end of the inner cavity of the rectangular frame 216.

[0100] The moving contact is connected to the side wall of one end of the insulating rod 218 that extends into the inner cavity of the rectangular frame 216.

[0101] Reference Figures 9 to 11 This invention provides a surface polishing device for a motor stator core, wherein the moving contact is a dynamic metal spring 223, and the fixed end of the dynamic metal spring 223 is connected to the side wall of one end of the insulating rod 218 that extends into the inner cavity of the rectangular frame 216.

[0102] The second touch terminal 221 and the first touch terminal 222 are both connected to the inner cavity sidewall of the rectangular frame 216, and the sidewall surfaces of the second touch terminal 221 and the first touch terminal 222 are flush with the inner cavity sidewall surface of the rectangular frame 216.

[0103] Reference Figures 9 to 11 This invention provides a surface polishing device for motor stator core. The signal unit includes a control circuit board 219 connected to the side wall of a rectangular frame 216. The control circuit board 219 is equipped with a wireless transmission module 220. The control circuit board 219 is pre-installed with a battery, which supplies power to the control circuit board 219 and the wireless transmission module 220.

[0104] When the return spring is in the initial relaxed state, the free end of the dynamic metal spring 223 elastically abuts against the surface of the inner wall of the rectangular frame 216.

[0105] When the free end of the dynamic metal spring 223 comes into contact with the first touch terminal 222, the trigger control circuit board 219 controls the wireless transmission module 220 to send a first alarm signal to the device controller 104.

[0106] When the free end of the dynamic metal spring 223 comes into contact with the second touch terminal 221, the trigger control circuit board 219 controls the wireless transmission module 220 to send a second alarm signal to the device controller 104.

[0107] When the second touch terminal 221 comes into contact with the first touch terminal 222 or the second touch terminal 221, the insulating coolant 217 filled inside the strip-shaped bottom box 213 cools and dissipates heat at the contact points between the terminals.

[0108] Before grinding the motor stator core, the execution unit with an external indicator 227 at its end is rotated to the top of the motor stator core. Then, the execution unit is slowly driven to move down by the first servo cylinder 106. When the sandpaper assembly contacts the surface of the core, as the execution unit moves further down, the flexible sealing membrane 224, which is pressed along with the sandpaper assembly, deforms. During the retraction of the advance and retreat reset device that expands and contracts synchronously with the deformed flexible sealing membrane 224, when the free end of the dynamic metal spring 223 contacts the first touch terminal 222, the control circuit board 219 is triggered to control the wireless transmission module 220 to send a first alarm signal to the device controller 104. The operator can observe and receive the first alarm signal through the display screen on the device controller 104. The operator can judge from the first alarm signal that the pressure of the execution unit on the surface of the core is within the preset range, so as to ensure the grinding pressure on the surface of the core during the subsequent grinding process, thereby ensuring the grinding effect on the surface of the motor stator core.

[0109] When the surface treatment structure continuously grinds the surfaces of multiple motor stator cores for an extended period, the temperature of the insulating coolant 217 filled in the bottom box mechanism rises abnormally, leading to a decrease in the cooling effect of the execution unit on the grinding area of ​​the core surface. When the irregular thermal expansion of the grinding area of ​​the core surface exceeds the preset critical upper limit, the flexible sealing membrane 224 is further compressed. During the process of the retracting reset device that synchronously expands and contracts with the deformed flexible sealing membrane 224, the free end of the dynamic metal spring 223 contacts the second touch terminal 221, triggering the control circuit board 219 to control the wireless transmission module 220 to send a second alarm signal to the equipment controller 104, reminding the operator to stop the machine in time to avoid excessive cutting and continuous impact on the grinding accuracy of the motor stator core surface, thus ensuring the grinding accuracy of the core surface.

[0110] Reference Figure 5 , Figure 6 , Figure 9 , Figure 10 ,as well as Figures 12 to 14 The present invention provides a surface grinding device for motor stator core. The bar component includes a sealing spring 225, a flow guide bar 211, a flow guide pipe 226, and an inclined groove disposed on the side wall of the hollow heat-conducting pressure plate 210 and connected to the inner cavity of the hollow heat-conducting pressure plate 210 and arranged at an inclination. The inclined groove and the flow guide pipe 226 are also filled with insulating coolant 217.

[0111] An indicator area is also provided on the side wall of the drainage strip 211;

[0112] The sealing spring 225 is connected to the inside of the inclined groove, the flow guide 211 slides damped in the inclined groove, and the middle of the end of the flow guide 211 inserted into the inclined groove is provided with a connecting part 228, and the connecting part 228 is connected to the sealing spring 225.

[0113] One end of the flow guide pipe 226 is fixedly connected to the end of the corresponding hollow heat-conducting pressure plate 210, and the other end is fixedly connected to the side wall of the strip-shaped bottom box 213.

[0114] As the insulating coolant 217 filled in the base box mechanism continuously absorbs the frictional heat from grinding, its temperature rises. This heat can then be dissipated into the environment through the strip-shaped base box 213, the flexible thermally conductive base layer 212, and the cold plate mechanism. Furthermore, when the rotating sandpaper assembly contacts the surface of the motor stator core, the flexible sealing membrane 224, subjected to the pressure of the core and undergoing elastic deformation, is injected into the inner cavity of its corresponding hollow thermally conductive pressure plate 210 through the guide pipe 226 in the spreading strip component. The increased hydraulic pressure within the hollow thermally conductive pressure plate 210 drives the sealing spring 225 to undergo elastic deformation. The deformed sealing spring 225 causes the guide strip 211 to extend from the inclined groove by a set length, allowing the spreading strip component to not only detect the grinding action but also... The pressure exerted by the actuator on the surface of the iron core is effectively reduced, and the airflow can be actively guided to the cold plate mechanism by extending a specific length of guide strip 211 during the subsequent rotation of the actuator. This accelerates the heat exchange between the strip-shaped bottom box 213, the cold plate mechanism, and the air. Consequently, during the grinding process of the motor stator iron core surface, it helps to accelerate the cooling efficiency of the insulating coolant 217 filled in the bottom box mechanism, ensuring the cooling effect of the actuator on the grinding part of the iron core surface. This further reduces the probability of irregular thermal expansion caused by excessive temperature in the grinding part of the iron core during the grinding process of the motor stator iron core, and further improves the grinding accuracy of the stator iron core surface.

[0115] During the process of the grinding and processing part of the iron core surface overheating and gradually developing irregular thermal expansion, which triggers the signal unit to issue an alarm signal, the flexible sealing membrane 224 is further compressed, causing the extension of the guide strip 211 to further increase. Thus, during the process of irregular expansion of the processing part and triggering the alarm signal, the longer extension of the guide strip 211 allows more airflow to be introduced, thereby further increasing the heat dissipation area, reducing heat dissipation blind spots, improving the heat dissipation efficiency of the insulating coolant 217 filled in the bottom box mechanism, realizing cooling compensation for the processing part of the iron core surface, effectively suppressing the continuous development of thermal expansion of the processing part of the iron core surface, and controlling the thermal expansion deformation of the processing part within a controllable range.

[0116] Before grinding the motor stator core, as the execution unit gradually applies pressure to the core surface and reaches the preset pressure, the flexible sealing membrane 224, which is pressed along with the sandpaper assembly, undergoes elastic deformation. This causes the insulating coolant 217 in the strip-shaped bottom box 213 to continuously squeeze into the hollow heat-conducting pressure plate 210 through the guide pipe 226, driving the sealing spring 225 to expand elastically. The deformed sealing spring 225 drives the guide strip 211 to extend from the end of the hollow heat-conducting pressure plate 210. When the dynamic metal spring 223 contacts the second touch terminal 221 and the operator receives the first alarm signal, if the indicator area on the guide strip 211 is exposed, it indicates that the elastic performance of the sealing spring 225 is normal. If the indicator area is not exposed or if the guide strip 211 extends abnormally... If the extension of the indicated area is abnormal, it means that the sealing spring 225 has been undergoing repeated elastic deformation over a long period of time, causing it to gradually lose its original elastic recovery ability and become elastically ineffective. Alternatively, it may be due to aging failure caused by long service time, resulting in leakage of insulating coolant 217. Timely maintenance of the equipment is required to prevent the sealing spring 225 from affecting the grinding pressure on the iron core surface due to elastic failure. This also prevents the sealing spring 225 from being torn under the rapidly increasing hydraulic pressure during grinding due to elastic failure, or leakage of insulating coolant 217 due to aging of the sealing spring 225. This would affect the cooling and heat dissipation effect of the stator iron core grinding area and the cooling compensation effect when the temperature of the insulating coolant 217 rises abnormally, thereby improving the reliability of equipment operation.

[0117] Example 2, the difference between this example and Example 1 is: (Refer to...) Figure 3 and Figure 4 The present invention provides a surface polishing device for motor stator core, wherein two second servo electric cylinders 109 are symmetrically arranged between two rotating shafts;

[0118] Each of the two second servo electric cylinders 109 has a support connected to its opposite end, and an end positioning roller 110 is fixed to the top of the support.

[0119] Each of the two second servo electric cylinders 109 has a support frame 108 connected to its opposite ends, and the end of the support frame 108 away from the second servo electric cylinder 109 connected to it is connected to the operating table 101.

[0120] After the motor stator core to be ground is placed between the left and right rows of drive rollers 103, the top support 202 is moved above the core by the linear motor 105. Then, the surface treatment structure is driven to move down by the first servo cylinder 106. After the grinding pressure of the execution unit is adjusted by the first servo cylinder 106, the third servo cylinder 204 is extended. When the upper positioning roller 205 is in contact with the core surface, the upper positioning roller 205 can perform the first-level limit treatment on the core to be processed. Then, the two second servo cylinders 109 are extended. When the two end positioning rollers 110 abut against the two ends of the core, the two end positioning rollers 110 perform the second-level limit treatment on the core. Then, the power motor 102 is turned on by the equipment controller 104, and the power motor 102 controls the corresponding rotating shaft to rotate, so that the core to be ground can rotate at a low speed, which facilitates the subsequent grinding of the motor stator core surface by the surface treatment structure.

[0121] The power motor 102, linear motor 105, first servo electric cylinder 106, second servo electric cylinder 109, and power component 201 in this application are all electrically connected to the equipment controller 104, and the equipment controller 104 is a common prior art device such as a computer that performs control functions. Contents not described in detail in this specification are prior art known to those skilled in the art.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A surface grinding device for a motor stator core, characterized in that: It includes a rotary drive unit for driving the stator core to rotate, and the rotary drive unit is provided with a surface treatment structure for polishing the side wall surface of the stator core. The surface treatment structure includes a polishing component and a power component (201) that drives the polishing component to rotate. The polishing assembly includes several execution units arranged in a circular array; The execution unit includes two cold plate mechanisms and a bottom box mechanism with an open end. A flexible sealing membrane (224) is connected to the open end of the bottom box mechanism. The bottom box mechanism is filled with insulating coolant (217). A heat-conducting sandpaper assembly is laid on the surface of the flexible sealing membrane (224), and the surface of the flexible sealing membrane (224) abuts against the surface of the sandpaper assembly. The two ends of the sandpaper assembly are fixedly connected to the bottom box mechanism by the two cold plate mechanisms. The bottom box mechanism of any one of the execution units is provided with a retractable reset device that can synchronously extend and retract with a flexible sealing membrane (224) that can follow deformation; The forward / backward reset device includes a moving contact and a stationary contact respectively connected to its free end and fixed end. The stationary contact includes a second touch terminal (221), a first touch terminal (222), and a signal unit. One of the cold plate mechanisms is equipped with a retractable extension strip component that is connected to the base box mechanism.

2. The surface grinding device for motor stator core according to claim 1, characterized in that: The rotary drive includes an operating table (101), on which two rotating shafts are symmetrically rotatably connected, and several driving rubber wheels (103) are uniformly sleeved and fixed on the outside of each rotating shaft. A power motor (102) is connected to the side wall of the control panel (101) at a position corresponding to one of the rotating shafts, and the output shaft of the power motor (102) is connected to the end of the rotating shaft; The side wall of the control panel (101) is also connected to the equipment controller (104) and the base support (107). A linear motor (105) is connected to the bottom support (107), and a lower base is connected to the moving platform of the linear motor (105). A first servo electric cylinder (106) is connected to the top of the lower base. The cold plate mechanism includes a hollow heat-conducting pressure plate (210), the inner cavity of which is filled with insulating coolant (217).

3. The surface grinding device for motor stator core according to claim 2, characterized in that: Two second servo electric cylinders (109) are symmetrically provided between the two rotating shafts. Each of the two second servo electric cylinders (109) is connected to a support at its opposite end, and an end positioning roller (110) is fixed to the top of the support. Each of the two second servo cylinders (109) has a support frame (108) connected to its opposite ends, and the end of the support frame (108) away from the second servo cylinder (109) connected to it is connected to the operating table (101).

4. The surface grinding device for motor stator core according to claim 2, characterized in that: The grinding assembly also includes a shaft support (207), on which a rotating shaft (214) is rotatably connected, and an outer cylinder seat (206) is fixedly fitted onto the rotating shaft (214). The bottom of the shaft bracket (207) is connected to a lifting platform (209) located above the first servo electric cylinder (106), and the end of the first servo electric cylinder (106) away from the lower base is fixedly connected to the bottom of the lifting platform (209); The lifting platform (209) is also connected to a top support (202). Two inclined third servo cylinders (204) are symmetrically connected on the top support (202). An upper positioning roller (205) is connected to the end of the third servo cylinder (204) away from the top support (202).

5. The surface grinding device for motor stator core according to claim 4, characterized in that: The power component (201) is fixedly connected to the top of the lifting platform (209); The power component (201) is a second servo motor (201), and the output shaft of the second servo motor (201) is connected to the end of the rotating shaft (214).

6. The surface grinding device for motor stator core according to claim 4, characterized in that: The bottom box mechanism includes a mounting frame (215) connected to the outer cylinder base (206), a strip bottom box (213) connected to the mounting frame (215), an advance / retreat reset device is disposed inside the strip bottom box (213) in the corresponding bottom box mechanism, and the end of the strip bottom box (213) with the advance / retreat reset device is provided with an external indicator (227). The flexible sealing membrane (224) is connected to the end opening of the strip-shaped bottom box (213), and the insulating coolant (217) is filled inside the strip-shaped bottom box (213); The sandpaper assembly includes a flexible thermally conductive substrate layer (212), and a polishing layer (203) is provided on the surface of the flexible thermally conductive substrate layer (212). The two ends of the flexible thermally conductive base layer (212) in the sandpaper assembly are fixedly connected to the bottom box mechanism by two hollow thermally conductive pressure plates (210), and the surface of the flexible sealing film (224) abuts against the surface of the flexible thermally conductive base layer (212) in the sandpaper assembly.

7. The surface grinding device for motor stator core according to claim 6, characterized in that: The advance and retreat reset device also includes a rectangular frame (216) with one end connected to the bottom wall of the inner cavity of the strip-shaped bottom box (213). An insulating rod (218) is slidably inserted on the other end of the rectangular frame (216). One end of the insulating rod (218) extends into the inner cavity of the rectangular frame (216) and is connected to a positioning block. The other end extends out from the end of the rectangular frame (216) and is connected to the inner wall of the flexible sealing membrane (224). A reset spring is connected to the end of the positioning block away from the insulating rod (218), and the end of the reset spring away from the positioning seat is connected to the end of the inner cavity of the rectangular frame (216); The moving contact is connected to the side wall at one end of the inner cavity of the rectangular frame (216) where the insulating rod (218) extends.

8. The surface grinding device for motor stator core according to claim 7, characterized in that: The moving contact is a dynamic metal spring (223), and the fixed end of the dynamic metal spring (223) is connected to the side wall of one end of the insulating rod (218) that extends into the inner cavity of the rectangular frame (216). The second touch terminal (221) and the first touch terminal (222) are both connected to the inner cavity sidewall of the rectangular frame (216), and the sidewall surfaces of the second touch terminal (221) and the first touch terminal (222) are flush with the inner cavity sidewall surface of the rectangular frame (216).

9. The surface grinding device for motor stator core according to claim 7, characterized in that: The moving contact, the second touch terminal (221), and the first touch terminal (222) are all electrically connected to the signal unit; The signal unit includes a control circuit board (219) connected to the side wall of the rectangular frame (216), and the control circuit board (219) is provided with a wireless transmission module (220). When the reset spring is in the initial relaxed state, the free end of the dynamic metal spring (223) elastically abuts against the surface of the inner wall of the rectangular frame (216); When the free end of the dynamic metal spring (223) comes into contact with the first touch terminal (222), the trigger control circuit board (219) controls the wireless transmission module (220) to send a first alarm signal to the device controller (104); When the free end of the dynamic metal spring (223) comes into contact with the second touch terminal (221), the trigger control circuit board (219) controls the wireless transmission module (220) to send a second alarm signal to the device controller (104).

10. The surface grinding device for motor stator core according to claim 6, characterized in that: The expansion bar component includes a sealing spring (225), a diversion bar (211), a flow guide pipe (226), and an inclined groove disposed on the side wall of the hollow heat-conducting pressure plate (210) and connected to the inner cavity of the hollow heat-conducting pressure plate (210) and arranged at an inclination. The inclined groove and the interior of the flow guide pipe (226) are also filled with insulating coolant (217). The side wall of the drainage strip (211) is also provided with an indicator area; The sealing spring (225) is connected to the inside of the inclined groove, the flow guide (211) slides damped in the inclined groove, and the middle of the end of the flow guide (211) inserted into the inclined groove is provided with a connecting part (228), and the connecting part (228) is connected to the sealing spring (225). One end of the flow guide pipe (226) is fixedly connected to the end of the corresponding hollow heat-conducting pressure plate (210), and the other end is fixedly connected to the side wall of the strip bottom box (213).

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