Magnetic ring press-in mechanism

Abstract

The utility model relates to the technical field of motor manufacturing equipment, and discloses a magnetic ring pressing-in mechanism which comprises a pressing cylinder fixing frame, a pressing cylinder and a pressing cylinder, the servo electric push rod is installed on the pressing cylinder fixing frame, and the output end of the servo electric push rod is vertically and downwards arranged in a telescopic mode; the magnetic ring pressing-in assembly is arranged on the pressing cylinder fixing frame in a sliding mode in the vertical direction, the magnetic ring pressing-in assembly is in transmission connection with the output end of the servo electric push rod, the magnetic ring pressing-in assembly comprises a magnetic ring pressing head and a pressure sensor, and the pressure sensor is arranged between the magnetic ring pressing head and the output end of the servo electric push rod; the upper end of the pressure sensor is in floating connection with the output end of the servo electric push rod, the lower end of the pressure sensor is connected with the magnetic ring pressing head, the magnetic ring pressing head can be pushed by the servo electric push rod to abut against the magnetic ring, and the servo electric push rod is electrically connected with the pressure sensor. The magnetic ring press-in mechanism provided by the utility model has the advantages that the press-fitting force can be reduced, the press-fitting force can be more accurately controlled, and the quality problems of magnetic ring cracking, improper assembly and the like are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of motor manufacturing equipment, in particular to a magnetic ring pressing mechanism. Background Art

[0002] The rotor is one of the important parts of the motor. It is located at the core of the motor and is responsible for converting electrical energy into mechanical energy. In order to ensure the smooth operation of the motor, a core sleeve and a magnetic ring need to be installed on the rotor shaft to support the rotor core and fix the motor magnetic field.

[0003] However, the installation of the core sleeve and the magnetic ring is usually done manually, which not only increases the labor cost, but also has quality problems such as difficulty in controlling the pressing force, resulting in cracking of the magnetic ring and inadequate assembly.

[0004] Therefore, a magnetic ring pressing mechanism is urgently needed to solve the above-mentioned technical problems. Utility Model Content

[0005] Based on the above, the purpose of the utility model is to provide a magnetic ring pressing mechanism, which drives the magnetic ring pressing assembly to press the magnetic ring onto the core sleeve through a servo electric push rod, can adjust the pressing force, and detect the pressing force through a pressure sensor. When the measured pressing force reaches a preset value, the servo electric push rod immediately stops pressing down, so as to more accurately control the pressing force and avoid quality problems such as cracking of the magnetic ring and inadequate assembly.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] Provides a magnetic ring press-in mechanism, including:

[0008] Cylinder fixing bracket;

[0009] A servo electric push rod is installed on the pressure cylinder fixing frame, and the output end of the servo electric push rod is vertically telescopically downward;

[0010] A magnetic ring pressing assembly is slidably arranged on the cylinder fixing frame along the vertical direction. The magnetic ring pressing assembly is transmission-connected to the output end of the servo electric push rod. The magnetic ring pressing assembly includes a magnetic ring pressing head and a pressure sensor. The pressure sensor is arranged between the magnetic ring pressing head and the output end of the servo electric push rod. The upper end of the pressure sensor is floatingly connected to the output end of the servo electric push rod, and the lower end of the pressure sensor is connected to the magnetic ring pressing head. The magnetic ring pressing head can be pressed against the magnetic ring under the push of the servo electric push rod. The servo electric push rod is electrically connected to the pressure sensor.

[0011] As an optional technical solution of the magnetic ring pressing mechanism, the magnetic ring pressing mechanism further includes:

[0012] The pressure magnetic ring displacement sensor is installed beside the magnetic ring pressure head. The pressure magnetic ring displacement sensor is used to detect the distance between the magnetic ring press-in assembly and the tooling seat assembly that carries the core sleeve. The servo electric push rod is electrically connected to the pressure magnetic ring displacement sensor.

[0013] As an optional technical solution for the magnetic ring pressing mechanism, the magnetic ring pressing assembly also includes a press-fit sliding plate, which is slidably arranged on the cylinder fixing frame along the vertical direction through a downward pressing slide rail slider structure, the press-fit sliding plate is connected to the output end of the servo electric push rod, and the magnetic ring pressure head is installed at the lower end of the press-fit sliding plate.

[0014] As an optional technical solution for the magnetic ring pressing mechanism, the magnetic ring pressing assembly also includes a floating joint, the upper end of the floating joint is connected to the output shaft of the servo electric push rod, the lower end of the floating joint is connected to the press-fit sliding plate, and the floating joint can elastically extend and retract in the vertical direction.

[0015] As an optional technical solution for the magnetic ring pressing mechanism, the floating joint includes a floating guide sleeve, a connecting screw, a floating spring, an adjusting nut and a floating pressure head. The upper end of the floating guide sleeve is connected to the output end of the servo electric push rod, the connecting screw is passed through the floating guide sleeve, the floating spring is sleeved on the connecting screw, the adjusting nut is threadedly connected to the connecting screw, the upper and lower ends of the floating spring are respectively abutted against the lower end of the floating guide sleeve and the upper surface of the adjusting nut, the floating pressure head is connected to the lower end of the connecting screw, and the floating pressure head is connected to the upper end of the pressure sensor.

[0016] As an optional technical solution of the magnetic ring pressing mechanism, the magnetic ring pressing head is provided with a guide through hole penetrating from top to bottom, and the magnetic ring pressing mechanism further includes:

[0017] The guide downward pressing assembly includes a guide downward pressing cylinder and a downward pressing guide head. The guide downward pressing cylinder is fixedly mounted on the press-fit sliding plate, the downward pressing guide head is mounted on the output end of the guide downward pressing cylinder, and the downward pressing guide head is passed through the guide through hole. The guide downward pressing cylinder can drive the downward pressing guide head to pass through the lower end of the guide through hole.

[0018] As an optional technical solution of the magnetic ring pressing mechanism, the magnetic ring pressing mechanism also includes a magnetic ring clamping assembly, which is installed on the press-fit sliding plate and is used to clamp the magnetic ring under the magnetic ring pressing head.

[0019] As an optional technical solution for the magnetic ring pressing mechanism, the magnetic ring clamping assembly includes a magnetic ring clamping air claw and two pushing fingers, the two pushing fingers are respectively installed on the two movable ends of the magnetic ring clamping air claw, and the lower end of the magnetic ring pressure head is provided with two clamping clearance grooves, and the clamping clearance grooves are respectively used to avoid the two pushing fingers.

[0020] As an optional technical solution of the magnetic ring pressing mechanism, the magnetic ring clamping assembly also includes:

[0021] The magnetic ring lifting cylinder is installed on the press-fit sliding plate through a pad, and the magnetic ring clamping air claw is installed on the output end of the magnetic ring lifting cylinder. The magnetic ring lifting cylinder can drive the magnetic ring clamping air claw to lift and lower in the vertical direction.

[0022] As an optional technical solution for the magnetic ring pressing mechanism, the magnetic ring pressing mechanism also includes an origin sensing switch and an origin sensing plate. The origin sensing switch is installed on the pressure cylinder fixing bracket, and the origin sensing plate is installed on the magnetic ring pressing assembly. When the servo electric push rod is in a retracted state, the origin sensing plate triggers the origin sensing switch.

[0023] The beneficial effects of the utility model are:

[0024] The magnetic ring pressing mechanism provided by the utility model drives the magnetic ring pressing assembly to press the magnetic ring onto the top of the core sleeve through the servo electric push rod to automatically assemble the magnetic ring and the core sleeve. Since the pressing power part adopts the servo electric push rod, and the magnetic ring pressing head is floatingly connected to the output end of the servo electric push rod, the pressing force can be adjusted to a very small and softer level, greatly reducing the probability of the magnetic ring cracking. In addition, a pressure sensor capable of detecting the pressing force is also provided between the magnetic ring pressing head and the servo electric push rod. The servo electric push rod is electrically connected to the pressure sensor. When the measured pressing force reaches a preset value, the servo electric push rod immediately stops pressing down, so as to more accurately control the pressing force and avoid quality problems such as magnetic ring cracking and inadequate assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0026] Figure 1 This is a schematic diagram of the structure of the magnetic ring pressing mechanism provided by the embodiment of the utility model Figure 1 ;

[0027] Figure 2This is a schematic diagram of the structure of the magnetic ring pressing mechanism provided by the embodiment of the utility model Figure 2 ;

[0028] Figure 3 yes Figure 2 Schematic diagram of the enlarged area A in the middle.

[0029] In the figure:

[0030] 10. Cylinder fixing bracket; 20. Servo electric push rod; 1. Magnetic ring pressure head; 11. Clamping and giving way groove; 2. Pressure sensor; 3. Magnetic ring displacement sensor; 4. Press-fit sliding plate; 41. Transfer fixing seat; 5. Floating joint; 51. Floating guide sleeve; 52. Connecting screw; 53. Floating spring; 54. Adjusting nut; 55. Floating pressure head; 61. Guide downward pressure cylinder; 62. Downward pressure guide head; 71. Magnetic ring air claw; 72. Pushing finger; 73. Magnetic ring lifting cylinder; 81. Origin induction switch; 82. Origin induction sheet; 9. Downward pressure slide slider structure. DETAILED DESCRIPTION

[0031] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the utility model. It is understandable that the specific embodiments described herein are only used to explain the utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model, rather than all of the structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the modules or components referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] This embodiment provides a magnetic ring pressing mechanism for pressing the magnetic ring onto the core sleeve so that the two can be assembled. Figure 1-Figure 3 As shown, the magnetic ring pressing mechanism includes a cylinder fixing frame 10, a servo electric push rod 20 and a magnetic ring pressing assembly, wherein the servo electric push rod 20 is installed on the cylinder fixing frame 10, and the output end of the servo electric push rod 20 is telescopically arranged vertically downward; the magnetic ring pressing assembly is slidably arranged on the cylinder fixing frame 10 along the vertical direction, and the magnetic ring pressing assembly is transmission-connected with the output end of the servo electric push rod 20, and the magnetic ring pressing assembly includes a magnetic ring pressing head 1 and a pressure sensor 2, and the pressure sensor 2 is arranged between the magnetic ring pressing head 1 and the output end of the servo electric push rod 20, the upper end of the pressure sensor 2 is floatingly connected with the output end of the servo electric push rod 20, and the lower end of the pressure sensor 2 is connected to the magnetic ring pressing head 1, and the magnetic ring pressing head 1 can be pressed against the magnetic ring under the push of the servo electric push rod 20, and the servo electric push rod 20 is electrically connected to the pressure sensor 2.

[0036] Specifically, the magnetic ring pressing mechanism provided in this embodiment drives the magnetic ring pressing assembly to press the magnetic ring onto the top of the core sleeve through the servo electric push rod 20 to automatically assemble the magnetic ring and the core sleeve. Since the pressing power part adopts the servo electric push rod 20, and the magnetic ring pressing head 1 is floatingly connected to the output end of the servo electric push rod 20, the pressing force can be adjusted to a very small and softer level, greatly reducing the probability of the magnetic ring cracking. In addition, a pressure sensor 2 capable of detecting the pressing force is also provided between the magnetic ring pressing head 1 and the servo electric push rod 20. The servo electric push rod 20 is electrically connected to the pressure sensor 2. When the measured pressing force reaches a preset value, the servo electric push rod 20 immediately stops pressing down to more accurately control the pressing force and avoid quality problems such as magnetic ring cracking and inadequate assembly.

[0037] For example, Figure 1 and Figure 2 As shown, the magnetic ring pressing assembly also includes a pressing sliding plate 4, which is slidably arranged on the cylinder fixing frame 10 along the vertical direction by pressing down the slide rail slider structure 9, the pressing sliding plate 4 is connected to the output end of the servo electric push rod 20, and the magnetic ring pressing head 1 is installed at the lower end of the pressing sliding plate 4.

[0038] For example, Figure 1 and Figure 2 As shown, the magnetic ring press-fit assembly also includes a floating joint 5, the upper end of the floating joint 5 is connected to the output shaft of the servo electric push rod 20, and the lower end of the floating joint 5 is connected to the press-fit sliding plate 4. The floating joint 5 can elastically expand and contract in the vertical direction.

[0039] Further, such as Figure 1 As shown, the floating joint 5 includes a floating guide sleeve 51, a connecting screw 52, ​​a floating spring 53, an adjusting nut 54 and a floating pressure head 55. The upper end of the floating guide sleeve 51 is connected to the output end of the servo electric push rod 20, the connecting screw 52 is inserted into the floating guide sleeve 51, the floating spring 53 is sleeved on the connecting screw 52, ​​the adjusting nut 54 is threadedly connected to the connecting screw 52, ​​the upper and lower ends of the floating spring 53 are respectively abutted against the lower end of the floating guide sleeve 51 and the upper surface of the adjusting nut 54, the floating pressure head 55 is connected to the lower end of the connecting screw 52, ​​and the floating pressure head 55 is connected to the upper end of the pressure sensor 2.

[0040] Specifically, by adjusting the height of the adjusting nut 54 , the pre-compression degree of the floating spring 53 can be adjusted, thereby adjusting the floating damping between the pressure sensor 2 and the servo electric push rod 20 .

[0041] Further, such as Figure 1 and Figure 2 As shown, a transfer fixing seat 41 is provided on the press-fitted sliding plate 4, and a clearance hole is provided on the transfer fixing seat 41 for the floating pressure head 55 to pass through. A step structure is provided at the lower end of the floating pressure head 55, and the step structure abuts against the transfer fixing seat 41 from below. When the servo electric push rod 20 retracts, the floating pressure head 55 pulls the transfer fixing seat 41 up through the step structure to assist in pulling up the magnetic ring press-in assembly to prevent the pressure sensor 2 from being subjected to excessive pulling force.

[0042] For example, Figure 1-Figure 3As shown, a guide through hole running through the upper and lower parts is provided in the magnetic ring pressing head 1, and the magnetic ring pressing mechanism also includes a guide pressing assembly, which includes a guide pressing cylinder 61 and a pressing guide head 62. The guide pressing cylinder 61 is fixedly mounted on the pressing sliding plate 4, and the pressing guide head 62 is mounted on the output end of the guide pressing cylinder 61, and the pressing guide head 62 is penetrated through the guide through hole. The guide pressing cylinder 61 can drive the pressing guide head 62 to pass through the lower end of the guide through hole and penetrate the center hole of the magnetic ring and the core sleeve to assist the pressing positioning.

[0043] For example, Figure 3 As shown, the lower end of the pressing guide head 62 is provided with a conical structure to facilitate passing through the center holes of the magnetic ring and the core sleeve.

[0044] For example, Figure 1-Figure 3 As shown, the magnetic ring pressing mechanism also includes a magnetic ring clamping assembly, which is installed on the press-fitting sliding plate 4, and is used to clamp the magnetic ring under the magnetic ring pressing head 1. Specifically, the magnetic ring clamping assembly includes a magnetic ring clamping air claw 71 and two material pushing fingers 72, and the two material pushing fingers 72 are respectively installed at the two movable ends of the magnetic ring clamping air claw 71, and the lower end of the magnetic ring pressing head 1 is provided with two clamping clearance grooves 11, and the clamping clearance grooves 11 are respectively used to avoid the two material pushing fingers 72.

[0045] For example, Figure 2 As shown, the magnetic ring clamping assembly also includes a magnetic ring clamping lifting cylinder 73, which is installed on the press-fitting sliding plate 4 through a pad, and a magnetic ring clamping air claw 71 is installed on the output end of the magnetic ring clamping lifting cylinder 73. The magnetic ring clamping lifting cylinder 73 can drive the magnetic ring clamping air claw 71 to rise and fall in the vertical direction, so that the magnetic ring clamping air claw 71 can extend and retract up and down to clamp the magnetic ring.

[0046] For example, Figure 1 As shown, the magnetic ring pressing mechanism also includes a magnetic ring displacement sensor 3, which is installed on the press-fitting sliding plate 4 and is located beside the magnetic ring pressing head 1. The magnetic ring displacement sensor 3 is used to detect the distance between the magnetic ring pressing assembly and the tooling seat assembly of the core sleeve. The servo electric push rod 20 is electrically connected to the magnetic ring displacement sensor 3. When the distance between it and the tooling seat assembly reaches a preset value, the servo electric push rod 20 immediately stops pressing down. The magnetic ring displacement sensor 3 cooperates with the pressure sensor 2 to detect the depth and force of the press-fitting, further improving the safety and reliability of the press-fitting.

[0047] For example, Figure 1 As shown, the magnetic ring pressing mechanism also includes an origin sensing switch 81 and an origin sensing sheet 82. The origin sensing switch 81 is installed on the cylinder fixing frame 10, and the origin sensing sheet 82 is installed on the magnetic ring pressing assembly. When the servo electric push rod 20 is in a retracted state, the origin sensing sheet 82 triggers the origin sensing switch 81.

[0048] Exemplarily, the origin sensing switch 81 adopts a photoelectric proximity switch or a magnetic induction switch.

[0049] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A magnetic ring pressing mechanism, characterized in that: include: Cylinder fixing frame (10); A servo electric push rod (20) is mounted on the cylinder fixing frame (10), and the output end of the servo electric push rod (20) is telescopically arranged vertically downward; A magnetic ring pressing assembly is slidably arranged on the cylinder fixing frame (10) along the vertical direction. The magnetic ring pressing assembly is transmission-connected to the output end of the servo electric push rod (20). The magnetic ring pressing assembly comprises a magnetic ring pressing head (1) and a pressure sensor (2). The pressure sensor (2) is arranged between the magnetic ring pressing head (1) and the output end of the servo electric push rod (20). The upper end of the pressure sensor (2) is floatingly connected to the output end of the servo electric push rod (20). The lower end of the pressure sensor (2) is connected to the magnetic ring pressing head (1). The magnetic ring pressing head (1) can be pressed against the magnetic ring under the push of the servo electric push rod (20). The servo electric push rod (20) is electrically connected to the pressure sensor (2).

2. The magnetic ring pressing mechanism according to claim 1, characterized in that: The magnetic ring pressing mechanism also includes: A pressure magnetic ring displacement sensor (3) is installed beside the magnetic ring pressure head (1). The pressure magnetic ring displacement sensor (3) is used to detect the distance between the magnetic ring pressing assembly and the tooling seat assembly of the core sleeve. The servo electric push rod (20) is electrically connected to the pressure magnetic ring displacement sensor (3).

3. The magnetic ring pressing mechanism according to claim 1, characterized in that: The magnetic ring pressing assembly also includes a pressing sliding plate (4), which is slidably arranged on the cylinder fixing frame (10) along the vertical direction through a downward pressing slide rail slider structure (9), the pressing sliding plate (4) is connected to the output end of the servo electric push rod (20), and the magnetic ring pressing head (1) is installed at the lower end of the pressing sliding plate (4).

4. The magnetic ring pressing mechanism according to claim 3, characterized in that: The magnetic ring press-fit assembly also includes a floating joint (5), the upper end of the floating joint (5) is connected to the output shaft of the servo electric push rod (20), the lower end of the floating joint (5) is connected to the press-fit sliding plate (4), and the floating joint (5) can elastically expand and contract in the vertical direction.

5. The magnetic ring pressing mechanism according to claim 4, characterized in that: The floating joint (5) comprises a floating guide sleeve (51), a connecting screw (52), a floating spring (53), an adjusting nut (54) and a floating pressure head (55). The upper end of the floating guide sleeve (51) is connected to the output end of the servo electric push rod (20). The connecting screw (52) is inserted into the floating guide sleeve (51). The floating spring (53) is sleeved on the connecting screw (52). The adjusting nut (54) is threadedly connected to the connecting screw (52). The upper and lower ends of the floating spring (53) are respectively in contact with the lower end of the floating guide sleeve (51) and the upper surface of the adjusting nut (54). The floating pressure head (55) is connected to the lower end of the connecting screw (52), and the floating pressure head (55) is connected to the upper end of the pressure sensor (2).

6. The magnetic ring pressing mechanism according to claim 3, characterized in that: The magnetic ring pressing head (1) is provided with a guide through hole penetrating upward and downward, and the magnetic ring pressing mechanism further comprises: The guide downward pressing component comprises a guide downward pressing cylinder (61) and a downward pressing guide head (62), wherein the guide downward pressing cylinder (61) is fixedly mounted on the press-fit sliding plate (4), the downward pressing guide head (62) is mounted on the output end of the guide downward pressing cylinder (61), and the downward pressing guide head (62) is penetrated through the guide through hole, and the guide downward pressing cylinder (61) can drive the downward pressing guide head (62) to penetrate out from the lower end of the guide through hole.

7. The magnetic ring pressing mechanism according to claim 3, characterized in that: The magnetic ring pressing mechanism further comprises a magnetic ring clamping assembly, wherein the magnetic ring clamping assembly is mounted on the pressing sliding plate (4), and the magnetic ring clamping assembly is used to clamp the magnetic ring below the magnetic ring pressing head (1).

8. The magnetic ring pressing mechanism according to claim 7, characterized in that: The magnetic ring clamping assembly comprises a magnetic ring clamping air claw (71) and two material pushing fingers (72), wherein the two material pushing fingers (72) are respectively mounted on two movable ends of the magnetic ring clamping air claw (71), and the lower end of the magnetic ring pressure head (1) is provided with two clamping clearance grooves (11), wherein the clamping clearance grooves (11) are respectively used to avoid the two material pushing fingers (72).

9. The magnetic ring pressing mechanism according to claim 8, characterized in that: The magnetic ring assembly also includes: The magnetic ring lifting cylinder (73) is installed on the press-fitting sliding plate (4) through a pad, and the magnetic ring clamping air claw (71) is installed on the output end of the magnetic ring lifting cylinder (73). The magnetic ring lifting cylinder (73) can drive the magnetic ring clamping air claw (71) to lift and lower in the vertical direction.

10. The magnetic ring pressing mechanism according to any one of claims 1 to 9, characterized in that: The magnetic ring pressing mechanism further comprises an origin sensing switch (81) and an origin sensing sheet (82); the origin sensing switch (81) is mounted on the cylinder fixing frame (10); the origin sensing sheet (82) is mounted on the magnetic ring pressing assembly; when the servo electric push rod (20) is in a retracted state, the origin sensing sheet (82) triggers the origin sensing switch (81).

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