An intelligent motor protection device

Abstract

The application discloses an intelligent motor protection device, which comprises a shell, a cover, a control system and a cover locking mechanism; the cover is detachably arranged on the shell; the control system comprises a controller and motor parameter detection module, a display unit, a control button group, an external terminal, an internal terminal and an audible and visual alarm module which are electrically connected with the controller; the controller and the internal terminal are arranged inside the shell; the display unit, the control button group, the external terminal and the audible and visual alarm module are arranged on the outer surface of the shell; the internal terminal is used for connecting the motor arranged inside the shell; the cover locking mechanism comprises a driving box, a plug rod driving mechanism, a plug rod and a plug rod seat; the driving box is arranged on the top of the cover; the plug rod seat is arranged on the top of the shell; the plug rod is slidably arranged through the side wall of the driving box; the plug rod driving mechanism is arranged inside the driving box and connected with a knob or a driving device. The application can solve the problems that the existing device is inconvenient to disassemble and assemble and cannot actively control the running state of the motor.

Description

Technical Field

[0001] This invention relates to the field of motor control, and in particular to an intelligent motor protection device. Background Technology

[0002] With the rapid development of industrial automation, motors, as the core power components of industrial equipment, directly affect the normal operation of production lines due to their operational stability. To ensure the safe operation of motors, motor protection devices are widely used in various motor drive systems.

[0003] Currently, motor protection devices typically consist of a housing and a cover. The housing houses the motor and control circuit boards, while the cover protects these components. When maintenance is required on the motor or circuit boards inside the housing, the cover must first be removed. However, in existing motor protection devices, the cover is often secured to the housing with bolts. Disassembly and maintenance require tools to tighten each bolt individually, making the process cumbersome and inefficient. Especially in emergency situations, if on-site personnel lack the necessary tools, they cannot promptly open the cover to inspect and address the internal components, potentially delaying troubleshooting and even escalating the problem.

[0004] Meanwhile, most existing motor protection devices are essentially just a shell with physical protection functions. They do not have a motor parameter detection module for collecting motor operating parameters, nor a controller for receiving and processing detection signals. When the motor experiences overload, overheating, or other faults, they cannot actively control the motor's operating status, which can lead to motor damage.

[0005] Therefore, it is particularly necessary to propose a new motor protection device to solve the problems of inconvenient disassembly and assembly of existing motor protection devices and the inability to actively control the motor's operating status. Summary of the Invention

[0006] The purpose of this invention is to provide an intelligent motor protection device that addresses the aforementioned problems. This device can solve the problems of inconvenient disassembly and assembly of existing motor protection devices and the inability to actively control the motor's operating status.

[0007] The technical solution adopted in this invention is as follows:

[0008] An intelligent motor protection device includes a housing, a cover, a control system, and a cover locking mechanism. The cover is detachably mounted on the housing. The control system includes a controller and a motor parameter detection module, a display unit, a control button group, external wiring terminals, internal wiring terminals, and an audible and visual alarm module, all electrically connected to the controller. The controller and internal wiring terminals are located inside the housing, while the display unit, control button group, external wiring terminals, and audible and visual alarm module are located on the outer surface of the housing. The internal wiring terminals are used to connect to a motor located inside the housing. The cover locking mechanism includes a drive box, a rod drive mechanism, a rod, and a rod seat. The drive box is located on the top of the cover, and the rod seat is located on the top of the housing and on the side of the drive box. The rod slides through the side wall of the drive box. The rod drive mechanism is located inside the drive box and is connected to a knob or drive device outside the drive box. The drive device is electrically connected to the controller. The rod drive mechanism is used to drive the rod to extend or retract into the drive box, thereby driving the rod to insert or retract from the rod seat.

[0009] Furthermore, the motor parameter detection module includes a current detection unit, a voltage detection unit, and / or a temperature detection unit electrically connected to the controller; the audible and visual alarm module includes a light alarm and / or an audible alarm electrically connected to the controller.

[0010] Furthermore, the insertion rod driving mechanism includes a screw, an adjusting plate, a connecting rod, and a push plate. The screw is vertically arranged, with its upper end rotatably connected to the top of the drive box and its lower end rotatably connected to the top of the cover. The adjusting plate is threaded onto the screw. One end of the connecting rod is hinged to the adjusting plate, and the other end is hinged to the push plate. The push plate is slidably disposed inside the drive box. One end of the insertion rod is fixedly connected to the push plate. When the screw rotates, it drives the adjusting plate to move up and down, and through the connecting rod, it drives the push plate to slide inside the drive box, causing the insertion rod to extend or retract into the drive box.

[0011] Furthermore, the push plate includes a front push plate and a rear push plate, the connecting rod includes a front connecting rod and a rear connecting rod, one end of the front connecting rod is hinged to the front side of the adjusting plate, the other end of the front connecting rod is hinged to the front push plate, one end of the rear connecting rod is hinged to the rear side of the adjusting plate, the other end of the rear connecting rod is hinged to the rear push plate, and the insert rod is in two sets, the two sets of insert rods are respectively slidably inserted through the front side wall and the rear side wall of the drive box, and the inner ends of the two sets of insert rods are respectively fixedly installed on the front push plate and the rear push plate.

[0012] Furthermore, there are two insertion rod seats, which are respectively located on the front and rear sides of the drive box. When the two sets of insertion rods extend out of the drive box, they can be inserted into the corresponding insertion rod seats.

[0013] Furthermore, it also includes an external device connection mechanism, which includes an external device connection seat, a housing connection seat, and a limiting member. The housing connection seat is connected to the housing and is detachably mounted on the external device connection seat. The limiting member is detachably mounted on the external device connection seat and is used to restrict the movement of the housing connection seat on the external device connection seat.

[0014] Furthermore, the housing connector includes a plug-in block and a connecting block. One end of the connecting block is connected to the housing, and the other end of the connecting block is connected to the plug-in block. The external device connector has a slot that extends through the top, and a notch is provided on the front side wall of the external device connector. The notch communicates with the slot, so that the front side of the slot forms an opening. The plug-in block and the connecting block are inserted into the slot and the notch together from the top of the slot and the notch.

[0015] Furthermore, the limiting member is disposed within the slot and located above the insertion block, with its bottom abutting against the top of the insertion block. The limiting member includes a limiting member body, a first insertion rod, a second insertion rod, and an insertion rod driving mechanism. The first insertion rod is slidably disposed on the left side of the limiting member body, and the second insertion rod is slidably disposed on the right side of the limiting member body. The insertion rod driving mechanism is disposed inside the limiting member body and located between the first and second insertion rods. The two ends of the insertion rod driving mechanism are respectively connected to the inner ends of the first and second insertion rods, and are used to drive the first and second insertion rods to extend or retract into the limiting member body, so that the outer ends of the first and second insertion rods are respectively inserted into or withdrawn from the positioning holes opened on the left and right walls of the slot.

[0016] Furthermore, the plug-in rod driving mechanism is a spring, and a sliding groove is provided on the top of the limiting member body. A first actuating member and a second actuating member are slidably disposed in the sliding groove. The lower end of the first actuating member is connected to the inner end of the first plug-in rod, and the upper end of the first actuating member extends out of the limiting member body from the sliding groove. The lower end of the second actuating member is connected to the inner end of the second plug-in rod, and the upper end of the second actuating member extends out of the limiting member body from the sliding groove. One end of the spring is connected to the inner end of the first plug-in rod, and the other end of the spring is connected to the inner end of the second plug-in rod.

[0017] Furthermore, the plug-in rod driving mechanism is an electric actuator, which is disposed inside the limiting member body and located between the first plug-in rod and the second plug-in rod. The two ends of the electric actuator are respectively connected to the inner ends of the first plug-in rod and the inner ends of the second plug-in rod. The electric actuator is electrically connected to the controller, and the controller controls the electric actuator to drive the first plug-in rod and the second plug-in rod to extend or retract into the limiting member body.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0019] This invention utilizes a control system and a cover locking mechanism. The motor parameter detection module in the control system monitors the motor's operating parameters in real time and transmits the detection signals to the controller. The controller then controls the motor's operation based on the detection signals, enabling the device to proactively control the motor's operating status when faults such as overload or overheating occur, achieving intelligent protection. Simultaneously, an audible and visual alarm module is located on the outer surface of the housing. When the controller detects a motor fault, it emits an audible and visual alarm signal to promptly alert on-site operators, preventing the fault from escalating due to delayed detection. Furthermore, the control button group, display unit, and external wiring terminals are all located on the outer surface of the housing, facilitating on-site viewing of motor operating parameters, input of control commands, and connection of external devices by operators.

[0020] Users can manually rotate the knob outside the drive box to activate the insertion rod drive mechanism, causing the insertion rod to extend or retract into the drive box. The insertion rod then inserts into or retracts from the insertion rod seat, thus locking or releasing the cover from the housing. This allows for cover assembly and disassembly without any tools, solving the problem of inconvenient bolt-locking methods and improving maintenance efficiency. Alternatively, users can input control commands to the controller via the control button group. The controller then controls the drive device to activate the insertion rod drive mechanism, causing the insertion rod to extend or retract into the drive box, and then insert or retract from the insertion rod seat, achieving automatic locking or releasing of the cover from the housing. Attached Figure Description

[0021] Figure 1 This is an overall structural diagram of the present invention.

[0022] Figure 2 This is an exploded view of the shell and cover.

[0023] Figure 3 This is an exploded view of the housing connector, external device connector, and limiting component.

[0024] Figure 4 This is a structural diagram of the cover locking mechanism.

[0025] Figure 5 for Figure 4 A magnified view of a portion of point A in the middle.

[0026] Figure 6 This is a diagram of the external structure of the limiting component.

[0027] Figure 7 This is a diagram of the internal structure of the limiting component.

[0028] In the diagram, 1-shell, 2-cover, 3-guide groove, 4-drive box, 5-plug seat, 6-shell connector, 7-external device connector, 8-limiting component, 9-display unit, 10-external wiring terminal, 41-knob, 42-screw, 43-adjusting plate, 44-vertical guide rod, 45-limiting block, 46-connecting rod, 47-push plate, 48-plug rod, 49-horizontal guide rod, 51-insertion hole, 71-slot, 72-positioning hole, 73-mounting hole, 81-slide groove, 82-first actuating component, 83-first plug-in rod, 84-limiting component body, 85-second plug-in rod, 86-second actuating component, 87-spring. Detailed Implementation

[0029] 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, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0031] like Figures 1 to 7 As shown, the present invention discloses an intelligent motor protection device, including a housing 1, a cover 2, a control system, and a locking mechanism for the cover 2, wherein the cover 2 is detachably mounted on the housing 1;

[0032] The control system includes a controller and a motor parameter detection module, a display unit 9, a control button group, an external wiring terminal 10, an internal wiring terminal, and an audible and visual alarm module, all electrically connected to the controller. The controller and the internal wiring terminal are located inside the housing 1, while the display unit 9, the control button group, the external wiring terminal 10, and the audible and visual alarm module are located on the outer surface of the housing 1. The internal wiring terminal is used to connect to the motor located inside the housing 1. The motor parameter detection module is used to detect the operating parameters of the motor and transmit the detection signals to the controller. The controller controls the operation of the motor according to the detection signals.

[0033] The locking mechanism of the cover 2 includes a drive box 4, a rod drive mechanism, a rod 48, and a rod seat 5. The drive box 4 is located on the top of the cover 2, and the rod seat 5 is located on the top of the housing 1 and on the side of the drive box 4. The rod 48 slides through the side wall of the drive box 4. The rod drive mechanism is located inside the drive box 4 and is connected to a knob 41 or a drive device outside the drive box 4. The drive device is electrically connected to the controller. The rod drive mechanism is used to drive the rod 48 to extend or retract into the drive box 4, so as to drive the rod 48 to insert or withdraw from the rod seat 5.

[0034] The system incorporates a control system and a locking mechanism for the cover 2. The motor parameter detection module in the control system monitors the motor's operating parameters in real time and transmits the detection signals to the controller. The controller then controls the motor's operation based on the detection signals, enabling the device to proactively control the motor's operating status when faults such as overload or overheating occur, achieving intelligent protection. Simultaneously, an audible and visual alarm module is located on the outer surface of the housing 1. When the controller detects a motor fault, it can issue an audible and visual alarm signal to promptly alert on-site operators, preventing the fault from escalating due to delayed detection. Furthermore, the control button group, display unit 9, and external wiring terminals 10 are all located on the outer surface of the housing 1, facilitating on-site viewing of motor operating parameters, input of control commands, and connection of external devices by operators.

[0035] The user can manually rotate the knob 41 outside the drive box 4 to activate the insertion rod drive mechanism, causing the insertion rod 48 to extend or retract into the drive box 4. The insertion rod 48 then inserts into or retracts from the insertion rod seat 5, thus locking or releasing the cover 2 from the housing 1. This allows for the assembly and disassembly of the cover 2 without the need for any tools, solving the problem of inconvenient assembly and disassembly using bolt-locking methods and improving maintenance efficiency. Alternatively, the user can input control commands to the controller via the control button group. The controller then controls the drive device according to the control commands, driving the insertion rod drive mechanism to extend or retract the insertion rod 48 into the drive box 4. The insertion rod 48 then inserts into or retracts from the insertion rod seat 5, achieving automatic locking or releasing of the cover 2 from the housing 1.

[0036] Furthermore, the motor parameter detection module includes a current detection unit, a voltage detection unit, and / or a temperature detection unit electrically connected to the controller; the audible and visual alarm module includes a light alarm and / or a sound alarm electrically connected to the controller, and the controller controls the audible and visual alarm module to emit audible and visual and / or sound alarm signals when the motor malfunctions.

[0037] Furthermore, the controller is connected to a remote terminal and / or a mobile terminal via a wireless communication module, for sending motor operating parameters and / or fault information to the remote terminal and / or the mobile terminal, and / or receiving control commands sent by the remote terminal and / or the mobile terminal.

[0038] Furthermore, the insertion rod driving mechanism includes a screw 42, an adjusting plate 43, a connecting rod 46, and a push plate 47. The screw 42 is vertically arranged, with its upper end rotatably connected to the top of the drive box 4 and its lower end rotatably connected to the top of the cover 2. The adjusting plate 43 is threaded onto the screw 42. One end of the connecting rod 46 is hinged to the adjusting plate 43, and the other end of the connecting rod 46 is hinged to the push plate 47. The push plate 47 is slidably disposed inside the drive box 4. One end of the insertion rod 48 is fixedly connected to the push plate 47. When the screw 42 rotates, it drives the adjusting plate 43 to move up and down, and through the connecting rod 46, it drives the push plate 47 to slide inside the drive box 4, causing the insertion rod 48 to extend or retract into the drive box 4.

[0039] When the screw 42 rotates, the adjusting plate 43 moves up and down along the screw 42, driving the push plate 47 to slide inside the drive box 4 via the connecting rod 46, thereby causing the insertion rod 48 to extend or retract into the drive box 4. This transmission mechanism converts the rotational motion of the screw 42 into the linear extension and retraction motion of the insertion rod 48, resulting in smooth and reliable transmission, a compact structure, small footprint, and easy integration into the drive box 4.

[0040] Compared to conventional solutions that directly drive the push plate 47 by arranging the drive mechanism horizontally to slide the push plate 47 (such as a horizontal cylinder, horizontal electric cylinder, or horizontal lead screw mechanism directly pushing the push plate 47), this application sets the screw 42 vertically and uses the connecting rod 46 for steering transmission, which has the following advantages: First, the internal space of the drive box 4 has a limited width in the front-to-back direction. The push plate 47 itself needs to slide in the front-to-back direction to drive the insertion rod 48. If the horizontal cylinder, horizontal electric cylinder, or horizontal lead screw mechanism is directly arranged horizontally in the front-to-back direction inside the drive box 4, the drive mechanism itself will occupy a large horizontal space, compressing the sliding stroke of the push plate 47 and the extension space of the insertion rod 48, resulting in an increase in the volume of the drive box 4. However, this application sets the screw 42 vertically and uses only the slender connecting rod 46 for steering transmission, effectively avoiding the problem of the limited width of the drive box 4 in the front-to-back direction, making the overall layout of the insertion rod drive mechanism more compact. Secondly, the purely mechanical transmission method of the vertical screw 42 and connecting rod 46 supports both manual rotation of the knob 41 and electric drive via a drive device, allowing for flexible switching between the two methods. Even when there is no power supply or the drive device malfunctions, the cover 2 can still be disassembled and assembled manually by rotating the knob 41, improving the reliability and adaptability of the device. Finally, the steering transmission structure formed by the vertical screw 42 and connecting rod 46, compared to direct horizontal drive solutions such as horizontal cylinders, horizontal electric cylinders, or horizontal lead screw mechanisms, can more flexibly match the required forward and backward extension stroke of the insertion rod 48 within the limited height space of the drive box 4 by adjusting the lifting stroke of the adjusting plate 43 and the swing angle of the connecting rod 46. A small lifting of the adjusting plate 43 can be amplified into a larger horizontal displacement of the push plate 47 through the lever action of the connecting rod 46, resulting in high transmission efficiency, a simple and reliable structure, and low cost.

[0041] Furthermore, the push plate 47 includes a front push plate and a rear push plate, the connecting rod 46 includes a front connecting rod and a rear connecting rod, one end of the front connecting rod is hinged to the front side of the adjusting plate 43, the other end of the front connecting rod is hinged to the front push plate, one end of the rear connecting rod is hinged to the rear side of the adjusting plate 43, the other end of the rear connecting rod is hinged to the rear push plate, and the insertion rod 48 is in two sets, the two sets of insertion rod 48 are respectively slidably inserted through the front side wall and the rear side wall of the drive box 4, and the inner ends of the two sets of insertion rod 48 are respectively fixedly installed on the front push plate and the rear push plate.

[0042] Through the symmetrical structure of double push plates 47, double connecting rods 46, and double insert rods 48, the adjusting plate 43 can simultaneously drive the insert rods 48 on both the front and rear sides to extend and retract synchronously when it moves up and down, so that the front and rear sides of the cover 2 are subjected to force at the same time, achieving a more balanced locking between the cover 2 and the shell 1, and the locking effect is more stable.

[0043] Furthermore, there are two insertion rod seats 5, which are respectively located on the front and rear sides of the drive box 4. When the outer ends of the two sets of insertion rods 48 extend out of the drive box 4, they can be inserted into the corresponding insertion rod seats 5. The insertion rod seats 5 are provided with insertion holes 51 for the insertion rods 48 to be inserted.

[0044] Furthermore, the knob 41 is located at the upper end of the screw 42, the upper end of the screw 42 extends out of the drive box 4, and the knob 41 is located outside the drive box 4.

[0045] Furthermore, the driving device is located on the top of the driving box 4, and the upper end of the screw 42 is connected to the driving device.

[0046] Furthermore, the driving device includes a drive motor and a drive gear set. The drive motor is connected to the upper end of the screw 42 through the drive gear set. The drive motor is located on the top of the drive box 4 and is electrically connected to the controller.

[0047] Furthermore, the drive box 4 is provided with a vertical guide rod 44 inside, and the adjustment plate 43 is slidably sleeved on the vertical guide rod 44.

[0048] Furthermore, the vertical guide rod 44 is disposed inside the drive box 4, the upper end of the vertical guide rod 44 is connected to the top of the drive box 4, the lower end of the vertical guide rod 44 is connected to the top of the cover 2, and the adjusting plate 43 is slidably sleeved on the vertical guide rod 44; the upper end and / or lower end of the vertical guide rod 44 are provided with a limiting block 45, which is used to limit the stroke of the adjusting plate 43.

[0049] Furthermore, a horizontal guide rod 49 is provided inside the drive box 4. The horizontal guide rod 49 includes a first horizontal guide rod and a second horizontal guide rod. The front end of the first horizontal guide rod is connected to the front side wall of the drive box 4, and the rear end of the second horizontal guide rod is connected to the rear side wall of the drive box 4. The front push plate is slidably sleeved on the first horizontal guide rod, and the rear push plate is slidably sleeved on the second horizontal guide rod.

[0050] Furthermore, it also includes an external device connection mechanism, which includes an external device connection seat 7, a housing connection seat 6, and a limiting member 8. The housing connection seat 6 is connected to the housing 1 and is detachably disposed on the external device connection seat 7. The limiting member 8 is detachably disposed on the external device connection seat 7 and is used to restrict the movement of the housing connection seat 6 on the external device connection seat 7.

[0051] Due to the above structure, the housing 1 can be quickly connected and fixed to the external equipment. In a specific implementation, the external equipment can be an electrical control cabinet, and the external equipment connection seat 7 is mounted on the electrical control cabinet through the mutual cooperation of the mounting holes 73 and bolts on the external equipment connection seat 7.

[0052] Furthermore, the housing connector 6 includes a plug-in block and a connecting block. One end of the connecting block is connected to the housing 1, and the other end of the connecting block is connected to the plug-in block. The size of the connecting block is smaller than that of the plug-in block, and the connecting block is located at the center of the plug-in block, so that the plug-in block and the connecting block form a T-shaped structure. The rear sidewall of the external device connector 7 is used to dock with an external device. The external device connector 7 has a slot 71 that passes through the top, and the front sidewall of the external device connector 7 has a notch that communicates with the slot 71, so that the front side of the slot 71 forms an opening, allowing the plug-in block and the connecting block to be inserted into the slot 71 and the notch together from the top of the slot 71 and the notch.

[0053] During installation, the T-shaped plug and connecting block are inserted into the slot 71 and notch from the top. The plug is constrained within the external device connector 7 by the left, right, and rear walls of the slot 71 and the front walls on both sides of the notch. The connecting block extends out of the notch and connects to the housing 1. The T-shaped structure, along with the slot 71 and notch, limits the horizontal movement of the housing connector 6, preventing it from dislodging from the external device connector 7. The top-insertion method of the plug makes installation and disassembly simple and quick.

[0054] Furthermore, the limiting member 8 is detachably disposed within the slot 71 and located above the insertion block, with the bottom of the limiting member 8 abutting against the top of the insertion block; the limiting member 8 includes a limiting member body 84, a first insertion rod 83, a second insertion rod 85, and an insertion rod driving mechanism. The first insertion rod 83 is slidably disposed on the left side of the limiting member body 84, and the second insertion rod 85 is slidably disposed on the right side of the limiting member body 84. The insertion rod driving mechanism is disposed inside the limiting member body 84 and located between the first insertion rod 83 and the second insertion rod 85. The two ends of the insertion rod driving mechanism are respectively connected to the inner ends of the first insertion rod 83 and the second insertion rod 85, and are used to drive the first insertion rod 83 and the second insertion rod 85 to extend or retract into the limiting member body 84, so that the outer ends of the first insertion rod 83 and the second insertion rod 85 are respectively inserted into or withdrawn from the positioning holes 72 opened on the left and right walls of the slot 71.

[0055] Furthermore, the plug-in rod driving mechanism is a spring 87, and the top of the limiting member body 84 is provided with a sliding groove 81. A first actuating member 82 and a second actuating member 86 are slidably disposed in the sliding groove 81. The lower end of the first actuating member 82 is connected to the inner end of the first plug-in rod 83, and the upper end of the first actuating member 82 extends out of the limiting member body 84 from the sliding groove 81. The lower end of the second actuating member 86 is connected to the inner end of the second plug-in rod 85, and the upper end of the second actuating member 86 extends out of the limiting member body 84 from the sliding groove 81. One end of the spring 87 is connected to the inner end of the first plug-in rod 83, and the other end of the spring 87 is connected to the inner end of the second plug-in rod 85.

[0056] When the user squeezes the two levers, they slide towards each other along the slide groove 81, causing the first and second plug rods 83 and 85 to compress the spring 87 and retract into the limiting member body 84. At this time, the limiting member 8 can be placed into or removed from the slot 71. When the two levers are released, the spring 87 returns to its original position, pushing the first and second plug rods 83 and 85 out of the limiting member body 84 and into the positioning hole 72. This structure achieves automatic extension and locking of the plug rods through the elastic force of the spring 87, allowing for the installation and removal of the limiting member 8 without the need for tools. The operation is convenient and the locking is reliable.

[0057] Furthermore, the plug-in rod driving mechanism is an electric actuator, which is disposed inside the limiting member body 84 and located between the first plug-in rod 83 and the second plug-in rod 85. The two ends of the electric actuator are respectively connected to the inner ends of the first plug-in rod 83 and the second plug-in rod 85. The electric actuator is electrically connected to the controller, and the controller controls the electric actuator to drive the first plug-in rod 83 and the second plug-in rod 85 to extend or retract into the limiting member body 84.

[0058] The electric actuator is electrically connected to the controller. The user inputs control commands to the controller through the control button group. The controller controls the electric actuator to drive the first plug rod 83 and the second plug rod 85 to extend or retract into the limiting member body 84 according to the control commands, so as to lock or unlock the limiting member 8 and the slot 71.

[0059] Furthermore, the electric actuator includes a bidirectional electric telescopic rod, a double-headed electric cylinder, or an electromagnet.

[0060] By specifically setting the electric actuator as a bidirectional electric telescopic rod, a double-headed electric cylinder, or an electromagnet, all of which are bidirectional output electric actuators, the plug rods on both sides can be driven to extend or retract synchronously into the limiting member body 84 when energized, thereby automatically completing the locking and unlocking of the limiting member 8 and improving the automation level of the device.

[0061] Furthermore, the housing connecting seat 6 and the limiting member 8 can be separate or fixedly connected together. When fixedly connected together, the limiting member 8 is fixedly positioned above the plug-in block.

[0062] Furthermore, the housing 1 can adopt the following two structural forms:

[0063] Structure 1, Box-type Housing Structure: The housing 1 is a box structure with an open top, and the cover 2 is a flat top cover structure adapted to the top opening. The cover 2 is detachably fitted onto the top opening of the housing 1. When the cover 2 is opened, the top of the housing 1 is completely open, facilitating the operation and maintenance of the components inside the housing 1. In specific implementation, the housing connecting seat 6 can be connected to any one of the front, rear, left, or right side walls of the housing 1 according to actual installation needs. The display unit 9 and control button group are located on the outer surface of the housing 1, avoiding the surface connected to the housing connecting seat 6, so as to facilitate observation and operation by the operator. When a motor is installed inside the housing 1, the shaft hole is opened on any side wall other than the surface connected to the housing connecting seat 6, and the motor shaft extends out of the housing 1 from the shaft hole and connects to the load.

[0064] Structure 2, box-type shell structure: The shell 1 includes a bottom plate, a front upright plate, and a rear upright plate. A guide groove 3 is provided on the left and right sides of the inner surface of the front upright plate, and a guide groove 3 is provided on the left and right sides of the inner surface of the rear upright plate. The cover 2 includes a top plate, a left upright plate, and a right upright plate. The front end of the left upright plate is inserted into the guide groove 3 on the left side of the inner surface of the front upright plate, and the rear end of the left upright plate is inserted into the guide groove 3 on the left side of the inner surface of the rear upright plate, and can slide vertically along the guide groove 3. The front end of the right upright plate is inserted into the guide groove 3 on the right side of the inner surface of the front upright plate, and the rear end of the right upright plate is inserted into the guide groove 3 on the right side of the inner surface of the rear upright plate, and can slide vertically along the guide groove 3. When maintenance is required, the cover 2 is lifted upwards, slides upwards along the guide groove 3, and can be removed from the housing 1. At this time, the top, left, and right sides of the housing 1 are open, providing a larger operating space compared to a box-type housing structure, facilitating maintenance personnel to inspect and maintain the motor and components inside the housing 1. In this structure, the housing connecting seat 6 is connected to the outer surface of the rear upright plate of the housing 1, and the display unit 9 and control button group are located on the outer surface of the front upright plate of the housing 1. When a motor is installed inside the housing 1, a shaft hole is provided on the front upright plate of the housing 1, and the motor shaft extends out of the housing 1 from the shaft hole and connects to the load.

[0065] Furthermore, the method of using the intelligent motor protection device is as follows.

[0066] Method 1:

[0067] This method is applicable to configurations that employ a box-type shell structure, where the limiting member 8 and the shell connecting seat 6 are separate, and where the cover 2 is locked manually by the knob 41, and the limiting member 8 is locked manually by the first toggle member 82 and the second toggle member 86.

[0068] Step 1: Motor installation and electrical connection

[0069] The motor is fixedly installed inside the housing 1, with the motor shaft extending out of the housing 1 from the shaft hole on the front upright plate and connected to the load. The motor parameter detection module is installed on the motor's three-phase power supply line and / or the surface of the motor housing 1, enabling the module to detect the motor's current, voltage, and / or temperature. The motor's power supply line is electrically connected to the controller via internal terminals, and the signal output terminal of the motor parameter detection module is electrically connected to the controller. When a box-type housing structure is used, the housing connecting seat 6 is connected to the outer surface of the rear upright plate of the housing 1, and the display unit 9, control button group, and audible and visual alarm module are located on the outer surface of the front upright plate of the housing 1. The external wiring terminal 10 is located at the top of the front upright plate of the housing 1, and the two insertion rod seats 5 are respectively located at the top of the front upright plate and the top of the rear upright plate of the housing 1.

[0070] Step 2: Manual installation and locking of cover 2

[0071] The cover 2 is placed on the housing 1 from top to bottom, so that the left and right vertical plates of the cover 2 are inserted into the guide grooves 3 on the left and right sides of the inner surface of the front and rear vertical plates of the housing 1, respectively, and slide down along the guide grooves 3 until they are closed with the housing 1.

[0072] Manually rotate the knob 41 outside the drive box 4. The knob 41 drives the screw 42 to rotate. The adjusting plate 43 moves downward along the screw 42. Through the connecting rod 46, it pushes the push plate 47 to slide outward, so that the insertion rod 48 extends out of the drive box 4 and is inserted into the insertion hole 51 of the insertion rod seat 5, thus completing the manual locking of the cover 2 and the housing 1.

[0073] Step 3: Manual installation and securing of the device and external equipment

[0074] The external device connector 7 is fixedly installed on the mounting surface of the external device through the mounting hole 73 and bolts.

[0075] Insert the plug block and the connecting block of the housing connector 6 together from the top of the slot 71 and the notch of the external device connector 7, so that the plug block is constrained inside the external device connector 7 by the left side wall, right side wall, rear side wall of the slot 71 and the front side walls on both sides of the notch, and the connecting block extends out of the external device connector 7 from the notch and connects to the housing 1.

[0076] Squeeze the first actuating element 82 and the second actuating element 86 on the limiting element 8 to make the first actuating element 82 and the second actuating element 86 slide towards each other along the slide groove 81, causing the first plug rod 83 and the second plug rod 85 to compress the spring 87 and retract into the limiting element body 84, placing the limiting element 8 into the slot 71 and placing it above the plug block, so that the bottom of the limiting element 8 abuts against the top of the plug block; release the first actuating element 82 and the second actuating element 86, the spring 87 returns to its original position and pushes the first plug rod 83 and the second plug rod 85 out of the limiting element body 84 and into the positioning holes 72 on the left and right side walls of the slot 71, locking the limiting element 8 in the slot 71, thereby preventing the housing connecting seat 6 from coming out upward, completing the manual installation and fixing of the whole machine.

[0077] Step 4: Starting and Normal Operation of the Motor

[0078] The motor start command is manually input via the control button group, and the controller starts the motor according to the command. During normal motor operation, the display unit 9 displays the operating parameters detected by the motor parameter detection module in real time, including current, voltage, and / or temperature. When it is necessary to stop the motor, a stop command is input via the control button group, and the controller stops the motor.

[0079] Step 5: Alarm Trigger and Emergency Disassembly

[0080] When the controller determines that the motor has an overload or over-temperature fault based on the detection signal from the motor parameter detection module, the controller controls the audible and visual alarm module to issue an audible and visual alarm signal. At the same time, the display unit 9 displays the fault type and / or the time of fault occurrence, and executes the corresponding protection action according to the fault type.

[0081] After receiving the audible and visual alarm signal, the operator pinches the first actuating element 82 and the second actuating element 86 on the limiting element 8, causing the first actuating element 82 and the second actuating element 86 to slide towards each other along the slide groove 81, which drives the first plug rod 83 and the second plug rod 85 to compress the spring 87 and retract into the limiting element body 84, thereby removing the limiting element 8 from the slot 71; then, the housing connecting seat 6 is lifted upwards to remove the entire machine from the external equipment connecting seat 7.

[0082] Rotate knob 41 in the opposite direction to retract rod 48 into drive box 4, lift cover 2 upward, and slide cover 2 upward along guide groove 3 to expose motor and components inside housing 1.

[0083] After troubleshooting, reinstall the cover 2 in the order of steps two to three and fix the whole machine on the external equipment connector 7. Restart the motor, the controller records the fault recovery time, and displays the fault as resolved through the display unit 9.

[0084] Method 2:

[0085] This method is applicable to configurations that employ a box-type housing structure, with the limiting member 8 fixedly installed above the plug-in block, and the cover 2 locked by a drive device and the limiting member 8 locked by an electric actuator.

[0086] Step 1: Motor installation and electrical connection

[0087] The motor is fixedly installed inside the housing 1, with the motor shaft extending out of the housing 1 from the shaft hole on the front upright plate and connected to the load. The motor parameter detection module is installed on the motor's three-phase power supply line and / or the surface of the motor housing 1, enabling the module to detect the motor's current, voltage, and / or temperature. The motor's power supply line is electrically connected to the controller via internal terminals, and the signal output terminal of the motor parameter detection module is electrically connected to the controller. When a box-type housing structure is used, the housing connecting seat 6 is connected to the outer surface of the rear upright plate of the housing 1, and the display unit 9, control button group, and audible and visual alarm module are located on the outer surface of the front upright plate of the housing 1. The external wiring terminal 10 is located at the top of the front upright plate of the housing 1, and the two insertion rod seats 5 are respectively located at the top of the front upright plate and the top of the rear upright plate of the housing 1.

[0088] Step 2: Installation and locking of cover 2

[0089] The cover 2 is placed on the housing 1 from top to bottom, so that the left and right vertical plates of the cover 2 are inserted into the guide grooves 3 on the left and right sides of the inner surface of the front and rear vertical plates of the housing 1, respectively, and slide down along the guide grooves 3 until they are closed with the housing 1.

[0090] The controller inputs a locking command to the controller via the control button group. The controller controls the drive device to operate according to the locking command. The drive device drives the screw 42 to rotate via the drive gear group. The adjusting plate 43 moves downward along the screw 42 and pushes the push plate 47 to slide outward via the connecting rod 46, so that the insertion rod 48 extends out of the drive box 4 and is inserted into the insertion hole 51 of the insertion rod seat 5, thus completing the locking of the cover 2 and the housing 1.

[0091] Step 3: Installation and fixing of the device and external equipment

[0092] The external device connector 7 is fixedly installed on the mounting surface of the external device through the mounting hole 73 and bolts.

[0093] Insert the plug and connecting block of the housing connector 6 together from the top of the slot 71 and notch of the external device connector 7, so that the plug is constrained inside the external device connector 7 by the left side wall, right side wall, rear side wall of the slot 71 and the front side walls on both sides of the notch, and the connecting block extends out of the external device connector 7 from the notch and connects to the housing 1. The limiting member 8 enters the slot 71 together with the plug and is located above the plug.

[0094] By inputting a locking command to the controller via the control button group, the controller controls the electric actuator to move according to the locking command. The electric actuator drives the first plug rod 83 and the second plug rod 85 to extend out of the limiting member body 84 and insert into the positioning holes 72 on the left and right side walls of the slot 71, locking the limiting member 8 in the slot 71, thereby preventing the housing connecting seat 6 from coming out upward, and completing the installation and fixing of the whole machine.

[0095] Step 4: Starting and Normal Operation of the Motor

[0096] A motor start command is input to the controller via the control button group, and the controller starts the motor according to the start command. During normal motor operation, the display unit 9 displays the operating parameters detected by the motor parameter detection module in real time, including current, voltage, and / or temperature. When it is necessary to stop the motor, a stop command is input to the controller via the control button group, and the controller stops the motor according to the stop command.

[0097] Step 5: Alarm Trigger and Emergency Disassembly

[0098] When the controller determines that the motor has an overload or over-temperature fault based on the detection signal from the motor parameter detection module, the controller controls the audible and visual alarm module to issue an audible and visual alarm signal. At the same time, the display unit 9 displays the fault type and / or the time of fault occurrence, and executes the corresponding protection action according to the fault type.

[0099] After receiving the audible and visual alarm signal, the operator inputs an unlock command to the controller through the control button group. The controller controls the electric actuator to move according to the unlock command. The electric actuator drives the first plug rod 83 and the second plug rod 85 to retract into the limiting member body 84, so that the first plug rod 83 and the second plug rod 85 exit the positioning hole 72. Then, the housing connecting seat 6 is lifted upward to remove the whole machine from the external equipment connecting seat 7.

[0100] The controller inputs an opening command to the controller via the control button group. The controller controls the drive device to operate according to the opening command. The drive device drives the screw 42 to rotate in the opposite direction through the drive gear group. The adjusting plate 43 moves upward along the screw 42. The connecting rod 46 pulls the push plate 47 to slide inward, so that the insertion rod 48 retracts into the drive box 4 and exits the insertion hole 51 of the insertion rod seat 5. The cover 2 is lifted upward, so that the cover 2 slides upward along the guide groove 3, exposing the motor and components inside the housing 1.

[0101] After troubleshooting, reinstall the cover 2 in the order of steps two to three and fix the whole machine on the external equipment connector 7. Restart the motor, the controller records the fault recovery time, and displays the fault as resolved through the display unit 9.

[0102] Furthermore, specific methods for determining overload faults include:

[0103] The controller acquires current signals in real time and calculates the effective value of the current I. rms Simultaneously calculate the rate of change of current, dI / dt. The formula for calculating the rate of change of current is:

[0104]

[0105] Where I(t) is the current sample value at the current moment, I(t-Δt) is the current sample value at the previous sampling moment, and Δt is the sampling interval.

[0106] The controller is based on the effective value of the current I. rms Based on the current change rate dI / dt, overload fault diagnosis is performed according to the following steps:

[0107] Step A1: Calculate the current effective value I rms With rated current value I e The ratio of these values ​​yields the load factor:

[0108]

[0109] Among them, I rms I is the effective value of the current. e This is the rated current value of the motor.

[0110] Step A2: Determine the range of the load rate η and calculate the overload severity coefficient S. over :

[0111] When η≤k1:

[0112]

[0113] When k1 < η ≤ k2:

[0114]

[0115] When η > k2:

[0116]

[0117] Where η is the load rate; k1 is the overload warning coefficient, ranging from 1.0 to 1.2; k2 is the overload protection coefficient, ranging from 1.2 to 1.5; and k1 <k2。

[0118] Step A3: Calculate the cumulative overload damage value D over :

[0119]

[0120] Among them, S over Δt represents the overload severity coefficient, and Δt represents the sampling interval.

[0121] Controller real-time cumulative overload severity coefficient S over The product of the product and the sampling interval Δt yields the cumulative overload damage value D. over .

[0122] Step A4: Evaluate the cumulative overload damage value D based on the current change rate dI / dt. over After making corrections, the corrected overload cumulative damage value D is obtained. over' :

[0123]

[0124] Among them, D over λ is the cumulative damage value due to overload; λ is the coefficient of change rate, ranging from 0.1 to 0.5; |dI / dt| is the absolute value of the current change rate; I base The current reference value is taken as the rated current value I. e .

[0125] Step A5: Determine the corrected cumulative overload damage value D over' Has the preset overload cumulative damage threshold D been reached? over_th :

[0126] When D over' ≥D over_th At that time, the controller determines that the motor has an overload fault.

[0127] Among them, D over' D is the corrected cumulative damage value for overload. over_th This is the threshold for cumulative damage from overload.

[0128] When step A5 determines that the motor has an overload fault, the controller performs the following protection actions:

[0129] Step A11: Send a power-off command to the motor power supply circuit through the internal wiring terminals to cut off the power supply to the motor and stop the motor from running;

[0130] Step A12: Record the various operating parameters at the time of the fault, including the effective current value I of the last n sampling periods before the fault occurred. rms Load rate η, overload severity coefficient S over and overload cumulative damage value D over' The resulting fault log is stored in the controller's internal memory.

[0131] Step A13: Send overload alarm information to a remote terminal and / or mobile terminal via a wireless communication module. The overload alarm information includes the fault type, fault time, and cumulative overload damage value D. over' The current values ​​in the last n sampling periods before the fault occurred;

[0132] Step A14: Control the audible and visual alarm module to issue audible and visual and / or sound alarm signals corresponding to the overload fault;

[0133] Step A15: Display the overload fault type and / or the time of fault occurrence on display unit 9.

[0134] Furthermore, specific methods for diagnosing over-temperature faults include:

[0135] The controller acquires the temperature signal T in real time and simultaneously calculates the rate of temperature change dT / dt.

[0136]

[0137] Where T is the temperature value at the current moment, T(t) is the temperature sample value at the current moment, T(t-Δt) is the temperature sample value at the previous sampling moment, and Δt is the sampling interval.

[0138] The controller performs over-temperature fault diagnosis according to the following steps:

[0139] Step B1: Calculate the current temperature T and the maximum allowable temperature T. max The ratio:

[0140]

[0141] Where θ is the temperature ratio, T is the current temperature, and T max This is the maximum permissible temperature value.

[0142] Step B2: Calculate the characteristic value P of the temperature rise trend based on the temperature change rate dT / dt and the current temperature T. temp :

[0143]

[0144] Where T is the current temperature, T0 is the ambient temperature, and the value of T0 ranges from -10 to 50℃; T max The maximum allowable temperature value; σ is the influence coefficient of the temperature rise rate, with a value range of 0.05~0.2; dT / dt is the rate of temperature change; T base The temperature reference value is the highest permissible temperature value T. max .

[0145] Step B3: Based on the characteristic value P of the temperature rise trend temp Calculate the overheating risk level R temp :

[0146] When P temp When ≤R1:

[0147]

[0148] When R1 <P temp When ≤R2:

[0149]

[0150] When P temp >R2:

[0151]

[0152] Among them, P temp R1 is the characteristic value of the temperature rise trend; R2 is the over-temperature warning threshold, with a value range of 0.6~0.8; R3 is the over-temperature protection threshold, with a value range of 0.9~1.0; and R4 is the characteristic value of the temperature rise trend. <R2。

[0153] Step B4: When R temp When R = 1, the controller issues an over-temperature warning through display unit 9; when R temp When the value is 2, the controller determines that the motor has an overheating fault.

[0154] Among them, R temp The risk level is considered excessively high.

[0155] When step B4 determines that the motor has an over-temperature fault, the controller performs the following protection actions:

[0156] Step B11: When R temp When =1, the controller issues an over-temperature warning through the display unit 9 to remind the operator to pay attention to changes in motor temperature;

[0157] Step B12: When R temp When the value is 2, the controller cuts off the power supply to the motor through the internal wiring terminals, causing the motor to stop running;

[0158] Step B13: Record the various operating parameters at the time of the fault, including the temperature value T and the temperature rise trend characteristic value P of the last n sampling periods before the fault occurred. temp and overheating risk level R temp The resulting fault log is stored in the controller's internal memory.

[0159] Step B14: Send the over-temperature alarm information to the remote terminal and / or mobile terminal through the wireless communication module. The over-temperature alarm information includes the fault type, the fault time, and the temperature values ​​of the last n sampling periods before the fault occurred.

[0160] Step B15: When R tempWhen =2, the controller controls the audible and visual alarm module to issue an audible and visual and / or sound alarm signal corresponding to the over-temperature fault. The audible and visual and / or sound alarm signal corresponding to the over-temperature fault is different from the audible and visual and / or sound alarm signals corresponding to the overload fault, short circuit fault and undervoltage fault.

[0161] Step B16: Display the over-temperature fault type and / or the time of fault occurrence on display unit 9;

[0162] Step B17: Drive the insertion rod 48 to retract into the drive box 4 through the drive device, so that the cover 2 and the housing 1 are unlocked, so as to facilitate heat dissipation inside the housing 1.

[0163] Step B18: Drive the first plug rod 83 and the second plug rod 85 into the limiting member body 84 by the electric actuator, so that the limiting member 8 is unlocked from the external equipment connection seat 7.

[0164] Furthermore, after the fault is cleared, the controller records the fault recovery time, updates the fault log and stores it in the controller's internal memory, and displays a message on display unit 9 indicating that the fault has been cleared and the motor can be restarted.

[0165] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An intelligent motor protection device, comprising a housing (1), a cover (2), a control system, and a cover locking mechanism, characterized in that: The cover (2) is detachably mounted on the housing (1); The control system includes a controller and a motor parameter detection module, a display unit (9), a control button group, an external wiring terminal (10), an internal wiring terminal and an audible and visual alarm module, which are electrically connected to the controller. The controller and the internal wiring terminal are located inside the housing (1). The display unit (9), the control button group, the external wiring terminal (10) and the audible and visual alarm module are located on the outer surface of the housing (1). The internal wiring terminal is used to connect to the motor located inside the housing (1). The cover locking mechanism includes a drive box (4), a rod driving mechanism, a rod (48), and a rod seat (5). The drive box (4) is located on the top of the cover (2). The rod seat (5) is located on the top of the housing (1) and on the side of the drive box (4). The rod (48) slides through the side wall of the drive box (4). The rod driving mechanism is located inside the drive box (4). The rod driving mechanism is connected to a knob (41) or a driving device outside the drive box (4). The driving device is electrically connected to the controller. The rod driving mechanism is used to drive the rod (48) to extend or retract into the drive box (4) so ​​as to drive the rod (48) to insert or withdraw from the rod seat (5).

2. The intelligent motor protection device according to claim 1, characterized in that: The motor parameter detection module includes a current detection unit, a voltage detection unit, and / or a temperature detection unit electrically connected to the controller; the audible and visual alarm module includes a light alarm and / or a sound alarm electrically connected to the controller.

3. The intelligent motor protection device according to claim 1, characterized in that: The insertion rod driving mechanism includes a screw (42), an adjusting plate (43), a connecting rod (46), and a push plate (47). The screw (42) is vertically arranged, and the upper end of the screw (42) is rotatably connected to the top of the drive box (4). The lower end of the screw (42) is rotatably connected to the top of the cover (2). The adjusting plate (43) is threaded onto the screw (42). One end of the connecting rod (46) is hinged to the adjusting plate (43), and the other end of the connecting rod (46) is hinged to the push plate (47). The push plate (47) is slidably arranged inside the drive box (4). One end of the insertion rod (48) is fixedly connected to the push plate (47). When the screw (42) rotates, it drives the adjusting plate (43) to move up and down. The connecting rod (46) drives the push plate (47) to slide inside the drive box (4), so that the insertion rod (48) extends or retracts into the drive box (4).

4. The intelligent motor protection device according to claim 3, characterized in that: The push plate (47) includes a front push plate and a rear push plate. The connecting rod (46) includes a front connecting rod and a rear connecting rod. One end of the front connecting rod is hinged to the front side of the adjusting plate (43), and the other end of the front connecting rod is hinged to the front push plate. One end of the rear connecting rod is hinged to the rear side of the adjusting plate (43), and the other end of the rear connecting rod is hinged to the rear push plate. The insert rod (48) consists of two sets. The two sets of insert rods (48) slide through the front and rear side walls of the drive box (4), respectively, and the inner ends of the two sets of insert rods (48) are fixedly installed on the front push plate and the rear push plate, respectively.

5. The intelligent motor protection device according to claim 4, characterized in that: There are two insertion rod seats (5), which are respectively located on the front and rear sides of the drive box (4). When the two sets of insertion rods (48) extend out of the drive box (4), they can be inserted into the corresponding insertion rod seats (5).

6. The intelligent motor protection device according to claim 1, characterized in that: It also includes an external device connection mechanism, which includes an external device connection seat (7), a housing connection seat (6) and a limiting member (8). The housing connection seat (6) is connected to the housing (1). The housing connection seat (6) is detachably disposed on the external device connection seat (7). The limiting member (8) is detachably disposed on the external device connection seat (7) and is used to restrict the movement of the housing connection seat (6) on the external device connection seat (7).

7. The intelligent motor protection device according to claim 6, characterized in that: The housing connector (6) includes a plug-in block and a connecting block. One end of the connecting block is connected to the housing (1), and the other end of the connecting block is connected to the plug-in block. The external device connector (7) has a slot (71) that passes through the top. The front side wall of the external device connector (7) has a notch that communicates with the slot (71), so that the front side of the slot (71) forms an opening. The plug-in block and the connecting block are inserted into the slot (71) and the notch together from the top of the slot (71) and the notch.

8. The intelligent motor protection device according to claim 7, characterized in that: The limiting member (8) is disposed within the slot (71) and located above the insertion block, with the bottom of the limiting member (8) abutting against the top of the insertion block; the limiting member (8) includes a limiting member body (84), a first insertion rod (83), a second insertion rod (85), and an insertion rod driving mechanism, wherein the first insertion rod (83) is slidably disposed on the left side of the limiting member body (84), the second insertion rod (85) is slidably disposed on the right side of the limiting member body (84), and the insertion rod driving mechanism is disposed on the limiting member. The body (84) is located inside the first plug-in rod (83) and the second plug-in rod (85). The two ends of the plug-in rod driving mechanism are respectively connected to the inner ends of the first plug-in rod (83) and the second plug-in rod (85), and are used to drive the first plug-in rod (83) and the second plug-in rod (85) to extend or retract into the limiting member body (84), so that the outer ends of the first plug-in rod (83) and the second plug-in rod (85) are respectively inserted into or withdrawn from the positioning holes (72) opened on the left and right walls of the slot (71).

9. The intelligent motor protection device according to claim 8, characterized in that: The plug-in rod driving mechanism is a spring (87). The top of the limiting member body (84) is provided with a sliding groove (81). A first actuating member (82) and a second actuating member (86) are slidably arranged in the sliding groove (81). The lower end of the first actuating member (82) is connected to the inner end of the first plug-in rod (83), and the upper end of the first actuating member (82) extends out of the limiting member body (84) from the sliding groove (81). The lower end of the second actuating member (86) is connected to the inner end of the second plug-in rod (85), and the upper end of the second actuating member (86) extends out of the limiting member body (84) from the sliding groove (81). One end of the spring (87) is connected to the inner end of the first plug-in rod (83), and the other end of the spring (87) is connected to the inner end of the second plug-in rod (85).

10. The intelligent motor protection device according to claim 8, characterized in that: The plug rod driving mechanism is an electric actuator. The electric actuator is located inside the limiting member body (84) and between the first plug rod (83) and the second plug rod (85). The two ends of the electric actuator are respectively connected to the inner ends of the first plug rod (83) and the second plug rod (85). The electric actuator is electrically connected to the controller. The controller controls the electric actuator to drive the first plug rod (83) and the second plug rod (85) to extend or retract into the limiting member body (84).

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