Fault detection device for hydraulic mechanism of circuit breaker

Abstract

The invention provides a circuit breaker hydraulic mechanism fault detection device, and relates to the field of circuit breaker fault detection.The circuit breaker hydraulic mechanism fault detection device comprises a shell, the bottom of the shell is provided with a detection cavity, the top of the shell is provided with an installation cavity, and one side of the shell is provided with an oil inlet and an oil outlet which are communicated with the detection cavity; a partition plate is arranged in the middle of the mounting cavity, a first sleeve is rotationally mounted between the partition plate and the inner wall of the top side of the mounting cavity, and a plurality of spiral grooves are formed in the bottom of the first sleeve; through the arrangement of the first sleeve, the spiral groove, the rotating shaft, the detection plate, a pressure spring, a pressure sensor and other structures, the resistance borne by the detection plate when the detection plate rotates in hydraulic oil can be monitored in real time, so that the viscosity of the hydraulic oil is detected, the hydraulic oil is conveniently replaced in time when the viscosity of the hydraulic oil is too high, and the working efficiency is improved. And the conditions of serious efficiency loss, hydraulic mechanism faults and the like caused by over-high viscosity of the hydraulic oil are prevented.

Description

Technical Field

[0001] The present invention belongs to the technical field of circuit breaker fault detection, and more specifically, it is a circuit breaker hydraulic mechanism fault detection device. Background Art

[0002] Hydraulic operating mechanisms are mainly applied to high-voltage circuit breakers. The hydraulic operating mechanism of an ultra-high voltage circuit breaker mainly consists of four parts: an energy storage element (motor, oil pump, accumulator), a control element (electromagnet, valve system), an actuator (working cylinder), and auxiliary elements (oil tank, pressure switch, pipeline). A high-voltage circuit breaker is the most important control and protection equipment in the power system, mainly composed of a circuit breaker body and an operating mechanism. The operating mechanism is mainly divided into a motor operating mechanism, a spring operating mechanism, a pneumatic operating mechanism, and a hydraulic operating mechanism, etc. Among them, the hydraulic operating mechanism is widely used in high-voltage circuit breakers, especially in the fields of ultra-high voltage and ultra-high voltage circuit breakers, due to its characteristics such as large output power, short action time, and smooth and noiseless operation.

[0003] Hydraulic oil is an important component of the circuit breaker hydraulic mechanism. During long-term use, due to various factors, such as seal leakage, wear of system components (including pistons, pump cylinders, etc.), aging and oxidation of the oil, etc., the impurities in the oil will increase. As the impurities in the hydraulic oil increase, the viscosity of the hydraulic oil will gradually rise, which will lead to a decrease in the efficiency of the hydraulic mechanism and even cause faults in the hydraulic mechanism.

[0004] In summary, the present invention provides a circuit breaker hydraulic mechanism fault detection device to solve the above problems. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a circuit breaker hydraulic mechanism fault detection device, which is achieved by the following specific technical means:

[0006] A circuit breaker hydraulic mechanism fault detection device includes a housing. A detection chamber is provided at the bottom of the housing, and an installation chamber is provided at the top of the housing. An oil inlet and an oil outlet communicating with the detection chamber are provided on one side of the housing. A partition is provided in the middle of the installation chamber. A first sleeve is rotatably installed between the partition and the top inner wall of the installation chamber. A plurality of spiral grooves are formed at the bottom of the first sleeve, and the plurality of spiral grooves are arranged in a circumferential array. A rotating shaft is also installed through the partition, and the top end of the rotating shaft penetrates into the first sleeve, and the penetrated end is connected with a movable plate. A plurality of connecting pins are arranged on the outer side of the movable plate, and the plurality of connecting pins respectively penetrate out of the first sleeve from the inside of each spiral groove;

[0007] A pressure sensor is arranged on the inner wall of the top side of the installation chamber inside the first sleeve, a pressure spring is installed in the first sleeve between the pressure sensor and the movable plate, and both ends of the pressure spring are fixedly connected to the pressure sensor and the movable plate respectively.

[0008] As a preferred technical solution of the present invention, a first through hole is arranged in the shell between the installation chamber and the detection chamber, a turntable is rotatably installed on the inner side of the first through hole, a second through hole is opened in the center of the turntable, a second sleeve is mounted on the surface of the rotating shaft below the partition, the second sleeve is concentrically arranged with the second through hole, and the sizes are equal, a detection plate is arranged on the outer side of the second sleeve, and a strip hole is opened on the turntable, the strip hole corresponds to the position of the detection plate, and the cross-sectional sizes are equal.

[0009] As a preferred technical solution of the present invention, a slider staggered with the detection plate is provided on the inner wall of the second through hole, a sliding groove is provided on the outer side of the second sleeve, and the slider is slidably connected to the sliding groove, a limiting groove is provided on the inner wall of the second sleeve, a limiting rib is provided on the outer side of the rotating shaft, and the cross-sectional dimensions corresponding to the position of the limiting rib and the limiting groove are equal.

[0010] As a preferred technical solution of the present invention, a worm wheel is fixedly installed on the outer side of the first sleeve at a position above the spiral groove, a worm is rotatably installed inside the installation chamber, and the worm is meshingly connected with the worm wheel.

[0011] As a preferred technical solution of the present invention, a limiting ring is arranged on the outer side of the top end of the second sleeve between the turntable and the partition, the outer side of the limiting ring is rotatably connected with a rotating ring, a connecting arm is arranged on one side of the rotating ring, a threaded rod is rotatably installed in the installation chamber between the partition and the bottom inner wall of the installation chamber, the threaded rod passes through the connecting arm, and the connecting arm and the threaded rod are threadedly connected.

[0012] As a preferred technical solution of the present invention, a first motor is fixedly installed inside the installation chamber, and the first motor is connected to the worm gear through a coupling transmission. A second motor is fixedly installed on the top of the partition, and the output end of the second motor is connected to the threaded rod through a coupling transmission.

[0013] As a preferred technical solution of the present invention, an observation window is provided on one side of the outer shell. An indicator bar is provided inside the observation window. An activity groove parallel to the indicator bar is also provided in the observation window. An activity ring is sleeved outside the first sleeve, and the activity ring is fixedly connected to the connecting pin. A connecting card seat is slidably installed outside the activity ring. One side of the connecting card seat is provided with a connecting rod. One end of the connecting rod far from the connecting card seat penetrates into the observation window from the inside of the activity groove, and the penetrated end is connected with an indicator needle.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Through structures such as the first sleeve, spiral groove, rotating shaft, detection plate, pressure spring, and pressure sensor provided in the present invention, the magnitude of the resistance received by the detection plate when rotating in hydraulic oil can be monitored in real time, thereby detecting the viscosity of the hydraulic oil, facilitating the timely replacement of the hydraulic oil when the viscosity of the hydraulic oil is too high, and preventing situations such as serious efficiency loss and hydraulic mechanism failure caused by too high viscosity of the hydraulic oil.

[0016] 2. Through structures such as the strip-shaped hole and threaded rod provided in the present invention, during the process of monitoring the viscosity of the hydraulic oil, the second motor can be periodically started to drive the threaded rod to rotate, driving the detection plate to pass through the inside of the strip-shaped hole. Since the cross-sectional dimensions of the strip-shaped hole and the detection plate are equal, during the process of the detection plate passing through the strip-shaped hole, the impurities in the hydraulic oil attached to its surface will be scraped off, thereby maintaining the cleanliness of the surface of the detection plate and preventing the increase in the rotation resistance of the detection plate caused by the agglomeration of impurities on the surface of the detection plate and resulting in inaccurate detection data. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional schematic diagram of the present invention;

[0018] Figure 2 is a three-dimensional schematic diagram of the internal structure of the present invention;

[0019] Figure 3 is a cross-sectional schematic diagram of the present invention;

[0020] Figure 4 is a three-dimensional schematic diagram of a part of the present invention

[0021] Figure 5 is a three-dimensional schematic diagram of the first sleeve in the present invention;

[0022] Figure 6 is the present invention Figure 1 A partial enlarged schematic diagram at A in.

[0023] In the figure:

[0024] 1. Housing; 101. Detection chamber; 102. Installation chamber; 103. Oil inlet; 104. Oil outlet; 105. Partition; 2. First sleeve; 3. Spiral groove; 4. Rotating shaft; 5. Movable plate; 6. Connecting pin; 7. Pressure sensor; 8. Pressure spring; 9. First through hole; 10. Turntable; 11. Second through hole; 12. Second sleeve; 13. Detection plate; 14. Strip-shaped hole; 15. Slide block; 16. Slide groove; 17. Limiting groove; 18. Limiting rib; 19. Worm gear; 20. Worm; 21. Limiting ring; 22. Rotating ring; 23. Connecting arm; 24. Threaded rod; 25. First motor; 26. Second motor; 27. Observation window; 28. Indicator bar; 29. Movable groove; 30. Movable ring; 31. Connecting card seat; 32. Connecting rod; 33. Indicator needle. Detailed implementation mode

[0025] The following further describes in detail the implementation mode of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0026] As Figure 1-6 shown, the present invention provides a fault detection device for a circuit breaker hydraulic mechanism, including a housing 1. A detection chamber 101 is provided at the bottom of the housing 1, an installation chamber 102 is provided at the top of the housing 1, an oil inlet 103 and an oil outlet 104 communicating with the detection chamber 101 are provided on one side of the housing 1. A partition 105 is provided in the middle of the installation chamber 102. A first sleeve 2 is rotatably installed between the partition 105 and the top inner wall of the installation chamber 102. A plurality of spiral grooves 3 are provided at the bottom of the first sleeve 2, and the plurality of spiral grooves 3 are arranged in a circumferential array. A rotating shaft 4 is also installed through the partition 105. The top end of the rotating shaft 4 penetrates into the first sleeve 2, and the penetrated end is connected with a movable plate 5. A plurality of connecting pins 6 are arranged on the outer side of the movable plate 5 in an array, and the plurality of connecting pins 6 respectively penetrate out of the first sleeve 2 from the inner sides of the respective spiral grooves 3;

[0027] A pressure sensor 7 is provided on the top inner wall of the installation chamber 102 inside the first sleeve 2. A pressure spring 8 is installed between the pressure sensor 7 and the movable plate 5 inside the first sleeve 2, and both ends of the pressure spring 8 are fixedly connected with the pressure sensor 7 and the movable plate 5 respectively.

[0028] The first sleeve 2 drives the rotating shaft 4 to rotate. During the rotation, when the rotating shaft 4 encounters resistance, a differential speed will be generated between the rotating shaft 4 and the first sleeve 2, causing the movable plate 5 to drive the connecting pin 6 to move in the spiral groove 3. During the movement of the connecting pin 6 along the spiral groove 3, it will not only rotate relative to the first sleeve 2, but also drive the movable plate 5 to move upward. When the movable plate 5 moves upward, it will cause the compression degree of the pressure spring 8 to increase until the elastic force of the pressure spring 8 reaches an equilibrium with the resistance force received by the rotation of the rotating shaft 4. The elastic force of the pressure spring 8 is monitored in real time through the pressure sensor 7, and then the resistance force received during the rotation of the rotating shaft 4 is detected. Through the pressure magnitude reflected by the pressure sensor 7, the viscosity of the hydraulic oil can be monitored remotely and in real time.

[0029] Among them, a first through hole 9 is provided between the installation chamber 102 and the detection chamber 101 inside the housing 1. A turntable 10 is rotatably installed inside the first through hole 9. A second through hole 11 is provided at the center of the turntable 10. A second sleeve 12 is sleeved below the partition plate 105 on the surface of the rotating shaft 4. The second sleeve 12 is concentric with the second through hole 11 and has the same size. A detection plate 13 is provided on the outer side of the second sleeve 12. A strip hole 14 is provided on the turntable 10. The strip hole 14 corresponds to the position of the detection plate 13 and has the same cross-sectional size.

[0030] Among them, sliders 15 are provided on the inner wall of the second through hole 11 and are distributed alternately with the detection plate 13. A sliding groove 16 is provided on the outer side of the second sleeve 12, and the sliders 15 are slidably connected with the sliding groove 16. A limiting groove 17 is provided on the inner wall of the second sleeve 12. A limiting rib 18 is provided on the outer side of the rotating shaft 4, and the limiting rib 18 corresponds to the position of the limiting groove 17 and has the same cross-sectional size.

[0031] By providing the limiting rib 18 and the limiting groove 17, the second sleeve 12 can rotate synchronously with the rotating shaft 4. By providing the sliding groove 16 and the sliders 15, the turntable 10 can rotate synchronously with the second sleeve 12. When the second sleeve 12 drives the detection plate 13 to rotate in the hydraulic oil, the more impurities there are in the hydraulic oil, the higher the viscosity of the hydraulic oil, and the greater the resistance required to drive the detection plate 13 to rotate by the second sleeve 12, and the greater the resistance received by the rotation of the rotating shaft 4, thereby achieving the purpose of detecting the viscosity and contamination degree of the hydraulic oil.

[0032] Among them, a worm gear 19 is fixedly installed above the spiral groove 3 on the outer side of the first sleeve 2. A worm 20 is rotatably installed inside the installation chamber 102, and the worm 20 is meshed with the worm gear 19. The first sleeve 2 is driven to rotate through the worm 20 and the worm gear 19, thereby increasing the torque of the first sleeve 2, so that the sleeve can drive the second sleeve 12 to rotate at a relatively stable speed in hydraulic oils of different viscosities.

[0033] Among them, a limiting ring 21 is arranged on the outer side of the top end of the second sleeve 12 between the turntable 10 and the partition 105, and a rotating ring 22 is rotatably connected to the outer side of the limiting ring 21. A connecting arm 23 is arranged on one side of the rotating ring 22, and a threaded rod 24 is rotatably installed in the installation chamber 102 between the partition 105 and the bottom inner wall of the installation chamber 102. The threaded rod 24 passes through the connecting arm 23, and the connecting arm 23 and the threaded rod 24 are threadedly connected.

[0034] During the rotation of the threaded rod 24, the connecting arm 23 threadedly connected thereto can be driven to move in the vertical direction, and the connecting arm 23 drives the rotating ring 22 to move, and the rotating ring 22 drives the first sleeve 2 to move through the limit ring 21, and then the first sleeve 2 drives the detection plate 13 to enter the detection chamber 101 or from the detection chamber 101 to the installation chamber 102. In the process of the detection sleeve entering from the detection chamber 101 to the installation chamber 102, the detection plate 13 will pass through the inside of each strip hole 14. Since the cross-sectional size of the strip hole 14 is equal to that of the detection plate 13, when the detection plate 13 passes through the strip hole 14, the impurities in the hydraulic oil attached to its surface will be scraped off, thereby maintaining the cleanliness of the surface of the detection plate 13, preventing impurities from agglomerating on the surface of the detection plate 13, resulting in increased rotation resistance of the detection plate 13, and causing inaccuracy in the detection data.

[0035] Among them, a first motor 25 is fixedly installed inside the installation chamber 102, and the first motor 25 is connected to the worm 20 through a coupling transmission. A second motor 26 is fixedly installed on the top of the partition 105, and the output end of the second motor 26 is connected to the threaded rod 24 through a coupling transmission.

[0036] The first motor 25 and the second motor 26 are used to drive the worm 20 and the threaded rod 24 to rotate respectively.

[0037] Among them, an observation window 27 is provided on one side of the shell 1, an indicator bar 28 is provided on the inner side of the observation window 27, and a movable groove 29 parallel to the indicator bar 28 is also provided in the observation window 27. A movable ring 30 is sleeved on the outer side of the first sleeve 2, and the movable ring 30 is fixedly connected to the connecting pin 6. A connecting seat 31 is slidably installed on the outer side of the movable ring 30, and a connecting rod 32 is provided on one side of the connecting seat 31. The end of the connecting rod 32 away from the connecting seat 31 penetrates into the observation window 27 from the inner side of the movable groove 29. The connecting rod 32 is slidably connected to the movable groove 29, and the penetrated end is connected to an indicator needle 33.

[0038] During the movement of the limit pin within the spiral groove 3, it will drive the movable ring 30 to rise synchronously. The movable ring 30 drives the connecting socket 31 to rise, and the connecting socket 31 drives the indicating needle 33 to rise synchronously through the connecting rod 32. The indicating strip 28 can be set to have three sections representing too low viscosity, normal viscosity, and too high viscosity from bottom to top. By observing the area of the indicating strip 28 pointed to by the indicating needle 33 on-site, the current viscosity of the hydraulic oil can be intuitively known, thus facilitating the timely detection of the viscosity.

[0039] Specific working principle:

[0040] When the hydraulic mechanism fault detection device of this circuit breaker is in use, the hydraulic oil in the hydraulic mechanism of the circuit breaker can be connected to the oil inlet 103 and the oil outlet 104 through the oil pipe, so that the hydraulic oil in the hydraulic mechanism passes through the detection chamber 101. At the same time, the first motor 25 drives the worm 20 to rotate, the worm 20 drives the worm wheel 19 meshed with it to rotate, and the worm wheel 19 drives the first sleeve 2 to rotate. During the rotation of the first sleeve 2, under the action of the pressure spring 8, the connecting pin 6 on the outer side of the movable plate 5 remains at the bottom of the spiral groove 3. Therefore, the first sleeve 2 can drive the rotating shaft 4 to rotate. The rotating shaft 4 drives the second sleeve 12 to rotate through the limiting rib 18 and the limiting groove 17, and the second sleeve 12 drives the detection plate 13 to rotate. During the process of the second sleeve 12 driving the detection plate 13 to rotate in the hydraulic oil, the resistance it receives during rotation will increase with the increase of the viscosity of the hydraulic oil, resulting in a synchronous increase in the rotation resistance of the rotating shaft 4. Thus, a differential speed is generated between the rotating shaft 4 and the first sleeve 2, causing the movable plate 5 to drive the connecting pin 6 to move in the spiral groove 3. During the movement of the connecting pin 6 along the spiral groove 3, it will not only rotate relative to the first sleeve 2, but also drive the movable plate 5 to move upward. When the movable plate 5 moves upward, it will cause an increase in the compression degree of the pressure spring 8 until the elastic force of the pressure spring 8 reaches equilibrium with the resistance received by the rotating shaft 4 during rotation. The elastic force of the pressure spring 8 is monitored in real time through the pressure sensor 7, and then the resistance received by the rotating shaft 4 during rotation can be detected. Through the pressure value reflected by the pressure sensor 7, the viscosity of the hydraulic oil can be monitored remotely and in real time. During the rotation and upward movement of the connecting pin 6 in the spiral groove 3, it will drive the movable ring 30 to rise synchronously, the movable ring 30 drives the connecting card seat 31 to rise synchronously, and the connecting card seat 31 drives the indicating needle 33 to rise synchronously through the connecting rod 32. The indicating strip 28 can be set to have three sections representing too low viscosity, normal viscosity, and too high viscosity from bottom to top. By observing the area of the indicating strip 28 pointed to by the indicating needle 33 on-site, the current viscosity of the hydraulic oil can be intuitively known. Through the above method, the real-time monitoring of the viscosity and contamination degree of the hydraulic oil is realized, which is convenient for timely replacement of the hydraulic oil to prevent excessive loss of hydraulic oil efficiency and even the occurrence of faults in the hydraulic mechanism. During the real-time monitoring of the hydraulic oil, the second motor 26 can be started regularly. The second motor 26 drives the threaded rod 24 to rotate. During the rotation of the threaded rod 24, it can drive the connecting arm 23 threadedly connected to it to move in the vertical direction. The connecting arm 23 drives the rotating ring 22 to move, and the rotating ring 22 drives the first sleeve 2 to move through the limiting ring 21. Thus, the first sleeve 2 drives the detection plate 13 into the detection chamber 101 or from the detection chamber 101 into the installation chamber 102. During the process of the second sleeve 12 entering the installation chamber 102 from the detection chamber 101, the detection plate 13 will pass through the inside of each strip hole 14. Since the cross-sectional dimensions of the strip hole 14 and the detection plate 13 are equal,During the process of the detection plate 13 passing through the strip-shaped hole 14, impurities in the hydraulic oil adhering to its surface will be scraped off, thereby maintaining the cleanliness of the surface of the detection plate 13 and preventing the impurities from caking on the surface of the detection plate 13, which may increase the rotational resistance of the detection plate 13 and cause inaccurate detection data.

[0041] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A circuit breaker hydraulic mechanism fault detection device, characterized in that: The invention comprises a housing (1), wherein a detection chamber (101) is arranged at the bottom of the housing (1), a mounting chamber (102) is arranged at the top of the housing (1), and an oil inlet (103) and an oil outlet (104) which are in communication with the detection chamber (101) are arranged on one side of the housing (1), and the housing (1) is characterized in that: a partition (105) is arranged in the middle of the mounting chamber (102), and a first sleeve (206) is rotatably mounted between the partition (105) and the top inner wall of the mounting chamber (102). ), a plurality of spiral grooves (3) are provided at the bottom of the first sleeve (2), and the plurality of spiral grooves (3) are arranged in a circular array, a rotating shaft (4) is also installed through the partition plate (105), the top end of the rotating shaft (4) penetrates into the first sleeve (2), and the penetrated end is connected to a movable plate (5), a plurality of connecting pins (6) are arranged in an array on the outer side of the movable plate (5), and the plurality of connecting pins (6) respectively penetrate from the inner side of each of the spiral grooves (3) to the outside of the first sleeve (2); A pressure sensor (7) is arranged on the inner wall of the top side of the installation chamber (102) inside the first sleeve (2), and a pressure spring (8) is installed in the first sleeve (2) between the pressure sensor (7) and the movable plate (5), and the two ends of the pressure spring (8) are fixedly connected to the pressure sensor (7) and the movable plate (5) respectively.

2. The circuit breaker hydraulic mechanism fault detection device according to claim 1, characterized in that: A first through hole (9) is arranged in the housing (1) between the installation chamber (102) and the detection chamber (101); a turntable (10) is rotatably mounted on the inner side of the first through hole (9); a second through hole (11) is provided at the center of the turntable (10); a second sleeve (12) is sleeved on the surface of the rotating shaft (4) below the partition (105); the second sleeve (12) and the second through hole (11) are concentrically arranged and have the same size; a detection plate (13) is arranged on the outer side of the second sleeve (12); a strip hole (14) is provided on the turntable (10); the strip hole (14) corresponds in position to the detection plate (13) and has the same cross-sectional size.

3. The circuit breaker hydraulic mechanism fault detection device according to claim 2, characterized in that: A slider (15) is arranged on the inner wall of the second through hole (11) and is staggered with the detection plate (13); a slide groove (16) is arranged on the outer side of the second sleeve (12), and the slider (15) and the slide groove (16) are slidably connected; a limiting groove (17) is arranged on the inner wall of the second sleeve (12); a limiting rib (18) is arranged on the outer side of the rotating shaft (4), and the corresponding cross-sectional dimensions of the limiting rib (18) and the limiting groove (17) are equal.

4. The circuit breaker hydraulic mechanism fault detection device according to claim 3, characterized in that: A worm wheel (19) is fixedly mounted on the outer side of the first sleeve (2) at a position above the spiral groove (3), and a worm (20) is rotatably mounted inside the mounting chamber (102), and the worm (20) is meshingly connected to the worm wheel (19).

5. The circuit breaker hydraulic mechanism fault detection device according to claim 4, characterized in that: A limiting ring (21) is arranged on the outer side of the top end of the second sleeve (12) between the turntable (10) and the partition (105); a rotating ring (22) is rotatably connected to the outer side of the limiting ring (21); a connecting arm (23) is arranged on one side of the rotating ring (22); a threaded rod (24) is rotatably installed in the installation chamber (102) between the partition (105) and the bottom inner wall of the installation chamber (102); the threaded rod (24) passes through the connecting arm (23), and the connecting arm (23) and the threaded rod (24) are threadedly connected.

6. The circuit breaker hydraulic mechanism fault detection device according to claim 5, characterized in that: A first motor (25) is also fixedly installed inside the installation chamber (102), and the first motor (25) is connected to the worm (20) via a coupling transmission. A second motor (26) is fixedly installed on the top of the partition (105), and the output end of the second motor (26) is connected to the threaded rod (24) via a coupling transmission.

7. The circuit breaker hydraulic mechanism fault detection device according to claim 1, characterized in that: An observation window (27) is provided on one side of the housing (1), an indicator bar (28) is provided on the inner side of the observation window (27), and a movable groove (29) parallel to the indicator bar (28) is also provided in the observation window (27). A movable ring (30) is sleeved on the outer side of the first sleeve (2), and the movable ring (30) is fixedly connected to the connecting pin (6). A connecting seat (31) is slidably mounted on the outer side of the movable ring (30), and a connecting rod (32) is provided on one side of the connecting seat (31). An end of the connecting rod (32) away from the connecting seat (31) penetrates into the observation window (27) from the inner side of the movable groove (29), and the penetrated end is connected to an indicator needle (33).

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