Device for continuously and stably detecting performance of closing spring of circuit breaker

Abstract

The invention relates to the technical field of circuit breaker detection, in particular to a circuit breaker closing spring performance continuous and stable detection device which comprises a supporting component, an alignment device is placed at the top end of the supporting component, first hydraulic cylinders are symmetrically and fixedly installed at the top of the supporting component, and a positioning frame is fixedly installed at the opposite ends of the first hydraulic cylinders. The alignment device comprises a circuit breaker, a hook, a bottom plate and a closing spring, the closing spring is fixedly installed in the circuit breaker, the hook is fixedly installed at the end of one end of the closing spring, the bottom plate is fixedly installed at the bottom end of the hook, and the supporting component comprises a contact device, a displacement device, a transmission device and a supporting device. The contact device is rotationally installed at one end of the top of the supporting device, the transmission device is fixedly installed at the bottom end of the supporting device, and the displacement device is slidably inserted into the other end of the top of the supporting device. Through the arrangement of the alignment device and the supporting part, the purposes of intermittent alignment cooperation and fixed-point release of the closing spring of the circuit breaker in a test are achieved.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker testing technology, specifically a device for continuously and stably testing the performance of circuit breaker closing springs. Background Technology

[0002] A closing spring is a mechanical energy storage device that releases its stored elastic potential energy when the circuit breaker needs to be closed, providing fast and reliable power to drive the moving contact of the circuit breaker to complete the closing operation.

[0003] For example, a circuit breaker with Chinese Patent Publication No. CN106710972A includes a housing, an incoming line mechanism, an outgoing line mechanism, an operating mechanism, an arc extinguishing mechanism, a short-circuit protection mechanism, and an overload protection mechanism. Its features include: a button mechanism connected above the operating mechanism, the button mechanism being installed in a mounting groove at the top of the housing; the outgoing line mechanism being installed in a mounting groove at the top of the housing, located to the left of the button mechanism; the arc extinguishing mechanism being located below the operating mechanism; the short-circuit protection mechanism being installed below the outgoing line mechanism and located to the left of the operating mechanism; and the short-circuit overload protection mechanism and the operating mechanism being located to the right of the arc extinguishing mechanism to provide overload protection for the circuit breaker.

[0004] Currently, existing circuit breaker closing springs cannot perform intermittent alignment and fixed-point release functions during testing because the closing button needs to be repeatedly touched and the positioning latch needs to repeatedly engage with the hook on the spring. Therefore, an improved device is needed to address these issues. Summary of the Invention

[0005] To address the problems in the prior art, this invention provides a device for continuously and stably testing the performance of circuit breaker closing springs.

[0006] The technical solution adopted by this invention to solve its technical problem is: a continuous and stable testing device for the performance of a circuit breaker closing spring, comprising a support component, an alignment device placed at the top of the support component, a first hydraulic cylinder symmetrically fixedly installed at the top of the support component, a positioning frame fixedly installed at the opposite end of the first hydraulic cylinder, the alignment device comprising a circuit breaker, a hook, a base plate and a closing spring, the closing spring being fixedly installed inside the circuit breaker, the hook being fixedly installed at one end of the closing spring, the base plate being fixedly installed at the bottom end of the hook, the support component comprising a contact device, a displacement device, a transmission device and a support device, the contact device being rotatably installed at one top end of the support device, the transmission device being fixedly installed at the bottom end of the support device, and the displacement device being slidably inserted into the other top end of the support device.

[0007] Specifically, the contact device includes a guide plate, a contact rod, a support back frame, a threaded rod, a support vertical frame, and a contact horizontal frame. The contact horizontal frame is fixedly installed at the bottom end of the support vertical frame, the guide plate is fixedly installed at the top end of the support vertical frame, the support back frame is fixedly installed at the side end of the guide plate, the threaded rod is symmetrically threaded into the side end of the support back frame, and the contact rod is rotatably installed at one end of the threaded rod.

[0008] Specifically, the displacement device includes a return spring, a movable support rod, a magnetic absorbing plate, an iron plate, a transmission gear, a first rack, a displacement cross plate, and a positioning post. The return spring is fixedly installed inside the top of the displacement cross plate, the movable support rod is fixedly installed at the top of the return spring, the magnetic absorbing plate is fixedly installed at the top of both ends of the movable support rod, the first rack is fixedly installed at the top of both ends of the movable support rod, and the first rack is located at the side end of the magnetic absorbing plate. The transmission gear is rotatably installed at the top of both ends of the displacement cross plate, the iron plate is fixedly installed at the top of the displacement cross plate, and the positioning post is fixedly installed at the center of the bottom end of the displacement cross plate.

[0009] Specifically, the transmission device includes a linkage rod, a rotating disk, a drive motor, and a cam. The cam is fixedly mounted on the outer ring of the rotating disk, the rotating disk is fixedly mounted on the top center of the drive motor, and the linkage rod is rotatably mounted on the top of the rotating disk.

[0010] Specifically, the support device includes a support base, a movable groove, a support platform, a guide groove, a partition plate, a support side frame, a limiting rod, a second rack, and a second hydraulic cylinder. The support base is fixedly installed at one top end of the support platform. The movable groove is opened inside the support platform near the support base. The guide groove is opened at the other top end of the support platform. The limiting rod is symmetrically fixedly installed inside the guide groove. The support side frame is symmetrically fixedly installed at the top of the support platform away from the support base. The partition plate is fixedly installed at the top of the support side frame. The second rack is fixedly installed at the top of the second hydraulic cylinder. The second hydraulic cylinder is fixedly installed on both sides inside the guide groove.

[0011] Specifically, the circuit breaker is placed at the top of the support platform away from the support base, and the drive motor is fixedly installed at the bottom of the support platform near the support base.

[0012] Specifically, the positioning column is rotatably mounted on the inner end of the linkage rod away from the rotating disk, the displacement horizontal plate is slidably sleeved on the outer ring of the limiting rod, the support vertical frame is rotatably mounted on the top of the support base, and the first rack meshes with the transmission gear.

[0013] Specifically, the side end of the base plate near the closing spring is in contact with the side end surface of the moving support rod, the contact rod is slidably inserted into the inside of the guide support plate, the contact crossbar is horizontally aligned with the cam, the top center of the displacement crossbar has an insertion hole adapted to the moving support rod, and the magnetic plate is vertically aligned with the iron plate.

[0014] Specifically, the magnetic plate and the iron plate are inclined at 45° on the side surfaces near the first rack. The thickness of the first rack and the second rack is 0.5 cm, and the thickness of the transmission gear is 1.5 cm. The first rack and the second rack are staggered. The top and bottom of the partition plate near the second rack are inclined at 30°. The side surface of the contact crossbeam away from the support vertical frame is arc-shaped. The bottom of the partition plate is flush with the top of the iron plate. The bottom of the support vertical frame is slidably inserted into the interior of the movable slot. The displacement crossbeam has symmetrically opened round holes inside. The support back frame has threaded holes inside. The guide plate has symmetrically opened movable holes that match the contact rod inside.

[0015] The beneficial effects of this invention are:

[0016] First, when the drive motor is turned on, the rotating disk can be rotated, which allows the linkage rod to pull the positioning column and the displacement plate to move. This allows the moving support rod to contact the base plate, which in turn moves the hook to contact the positioning lock inside the circuit breaker, allowing the circuit breaker to enter the closing state. Furthermore, when the displacement plate is moved, it can drive the transmission gear to move along the top of the second rack, which can drive the moving support rod to move downward. The moving support rod can be misaligned with the base plate, which facilitates the subsequent release of the closing spring and completes the intermittent alignment and coordination.

[0017] Second, when the rotating disk rotates, it can drive the cam to contact the contact crossbar, so that the contact rod can be squeezed to rotate and contact the closing button on the circuit breaker, thereby releasing the hook. The elasticity of the closing spring will quickly drive the contacts to close, completing the closing action. Furthermore, when the displacement crossbar moves and resets, it can drive the magnetic plate and iron plate to contact the partition plate, so that the magnetic plate can separate from the iron plate, and the moving support rod resets. This makes it easy for the moving support rod to move the base plate to the front end when it moves again, completing the fixed-point release work. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a three-dimensional structural diagram of the main body from a frontal perspective in this invention;

[0020] Figure 2 This is a three-dimensional structural diagram of the alignment device from a lower perspective in this invention;

[0021] Figure 3 This is a three-dimensional structural diagram of the support component from a lower view in this invention;

[0022] Figure 4 This is a three-dimensional structural diagram of the contact device from the front view in this invention;

[0023] Figure 5 This is a partial cross-sectional schematic diagram of the displacement device in this invention;

[0024] Figure 6 This is a three-dimensional structural diagram of the transmission device from the front view in this invention;

[0025] Figure 7 This is a three-dimensional structural diagram of the support device from the front view in this invention;

[0026] Figure 8 In this invention Figure 7 A magnified view of part A.

[0027] In the diagram: 1-Alignment device, 2-Supporting component, 3-First hydraulic cylinder, 4-Positioning frame, 5-Circuit breaker, 6-Hook, 7-Base plate, 8-Closing spring, 9-Contact device, 10-Displacement device, 11-Transmission device, 12-Supporting device, 13-Guide support plate, 14-Contact rod, 15-Supporting back frame, 16-Threaded rod, 17-Supporting vertical frame, 18-Contact horizontal frame, 19-Reset spring, 20-Moving support rod, 21-Magnetic suction plate, 22-Iron plate, 23-Transmission gear, 24-First rack, 25-Displacement horizontal plate, 26-Positioning column, 27-Linkage rod, 28-Rotating disk, 29-Drive motor, 30-Cam, 31-Supporting base, 32-Movable groove, 33-Supporting platform, 34-Guide groove, 35-Separation plate, 36-Supporting side frame, 37-Limiting rod, 38-Second rack, 39-Second hydraulic cylinder. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0029] The invention will be further described below with reference to the accompanying drawings.

[0030] like Figure 1 , Figure 2 and Figure 3As shown, the present invention discloses a continuous and stable testing device for the closing spring performance of a circuit breaker, comprising a support component 2, an alignment device 1 placed at the top of the support component 2, a first hydraulic cylinder 3 symmetrically fixedly installed at the top of the support component 2, a positioning frame 4 fixedly installed at the opposite end of the first hydraulic cylinder 3, the alignment device 1 comprising a circuit breaker 5, a hook 6, a base plate 7 and a closing spring 8, the closing spring 8 being fixedly installed inside the circuit breaker 5, the hook 6 being fixedly installed at one end of the closing spring 8, and the base plate 7 being fixedly installed at the bottom end of the hook 6, the support component 2 comprising a contact device 9, a displacement device 10, a transmission device 11 and a support device 12, the contact device 9 being rotatably installed at one top end of the support device 12, the transmission device 11 being fixedly installed at the bottom end of the support device 12, and the displacement device 10 being slidably inserted into the other top end of the support device 12.

[0031] like Figure 4 The contact device 9 includes a guide plate 13, a contact rod 14, a support back frame 15, a threaded rod 16, a support vertical frame 17, and a contact horizontal frame 18. The contact horizontal frame 18 is fixedly installed at the bottom end of the support vertical frame 17, the guide plate 13 is fixedly installed at the top end of the support vertical frame 17, the support back frame 15 is fixedly installed at the side end of the guide plate 13, the threaded rod 16 is symmetrically threaded into the side end of the support back frame 15, and the contact rod 14 is rotatably installed at one end of the threaded rod 16. Since the weight of the contact horizontal frame 18 is greater than the total weight of the contact rod 14, the guide plate 13, the support back frame 15, and the threaded rod 16, it is easy for the contact horizontal frame 18 to drive the contact rod 14 to disengage from the button on the circuit breaker 5.

[0032] like Figure 5 The displacement device 10 includes a return spring 19, a movable support rod 20, a magnetic absorbing plate 21, an iron plate 22, a transmission gear 23, a first rack 24, a displacement horizontal plate 25, and a positioning post 26. The return spring 19 is fixedly installed inside the top of the displacement horizontal plate 25, the movable support rod 20 is fixedly installed at the top of the return spring 19, the magnetic absorbing plate 21 is fixedly installed at the top of both ends of the movable support rod 20, the first rack 24 is fixedly installed at the top of both ends of the movable support rod 20, and the first rack 24 is located at the side end of the magnetic absorbing plate 21. The transmission gear 23 is rotatably installed at the top of both ends of the displacement horizontal plate 25, the iron plate 22 is fixedly installed at the top of the displacement horizontal plate 25, and the positioning post 26 is fixedly installed at the center of the bottom end of the displacement horizontal plate 25. The magnetic absorbing plate 21 attracts the iron plate 22, so that the movable support rod 20 can be prevented from resetting prematurely.

[0033] like Figure 6The transmission device 11 includes a linkage rod 27, a rotating disk 28, a drive motor 29, and a cam 30. The cam 30 is fixedly installed on the outer ring of the rotating disk 28, and the rotating disk 28 is fixedly installed at the top center of the drive motor 29. The linkage rod 27 is rotatably installed on the top of the rotating disk 28. When the rotating disk 28 rotates, it can drive the linkage rod 27 to reciprocate, so that the displacement plate 25 can reciprocate to drive the bottom plate 7 to move.

[0034] like Figure 7 and Figure 8 The support device 12 includes a support base 31, a movable groove 32, a support platform 33, a guide groove 34, a partition plate 35, a support side frame 36, a limiting rod 37, a second rack 38, and a second hydraulic cylinder 39. The support base 31 is fixedly installed at one end of the top of the support platform 33. The movable groove 32 is opened inside the support platform 33 near the support base 31. The guide groove 34 is opened at the other end of the top of the support platform 33. The limiting rod 37 is symmetrically fixedly installed inside the guide groove 34. The support side frame 36 is symmetrically fixedly installed at the top of the support platform 33 away from the support base 31. The partition plate 35 is fixedly installed at the top of the support side frame 36. The second rack 38 is fixedly installed at the top of the second hydraulic cylinder 39. The second hydraulic cylinder 39 is fixedly installed on both sides inside the guide groove 34. When the second hydraulic cylinder 39 is started, it can drive the second rack 38 to move up and down, so that the second rack 38 can easily contact or disengage from the transmission gear 23.

[0035] The circuit breaker 5 is placed on the top of the support platform 33 away from the support base 31. The drive motor 29 is fixedly installed on the bottom of the support platform 33 near the support base 31. The positioning column 26 is rotatably installed on the inner end of the linkage rod 27 away from the rotating disk 28. The displacement horizontal plate 25 is slidably sleeved on the outer ring of the limit rod 37. The support vertical frame 17 is rotatably installed on the top of the support base 31. The first rack 24 meshes with the transmission gear 23. The side end of the base plate 7 near the closing spring 8 is in contact with the side end surface of the moving support rod 20. The contact rod 14 is slidably inserted into the inside of the guide support plate 13. The contact horizontal frame 18 is horizontally aligned with the cam 30. The top center of the displacement horizontal plate 25 has an insertion hole that matches the moving support rod 20. The magnetic plate 21 is vertically aligned with the iron plate 22. The side surfaces of plate 21 and iron plate 22 near the first rack 24 are inclined at 45°. The thickness of the first rack 24 and the second rack 38 is 0.5 cm. The thickness of the transmission gear 23 is 1.5 cm. The first rack 24 and the second rack 38 are staggered. The top and bottom of the side end of the partition plate 35 near the second rack 38 are inclined at 30°. The side surface of the contact crossbeam 18 away from the support vertical frame 17 is arc-shaped. The bottom end of the partition plate 35 is flush with the top end of the iron plate 22. The bottom end of the support vertical frame 17 is slidably inserted into the interior of the movable slot 32. The interior of the displacement crossbeam 25 is symmetrically provided with round holes. The interior of the support back frame 15 is provided with threaded holes. The interior of the guide plate 13 is symmetrically provided with movable holes that are compatible with the contact rod 14.

[0036] The working principle is as follows: During use, the circuit breaker 5 is first placed vertically on the top of the support platform 33 near the partition plate 35. Then, the first hydraulic cylinder 3 is activated, which drives the positioning frame 4 to restrict and position the circuit breaker 5, preventing it from shaking or shifting during testing. Simultaneously, the movable support rod 20 can be aligned with the base plate 7, allowing the drive motor 29 to be turned on, rotating the rotating disk 28. When the rotating disk 28 rotates, it moves the linkage rod 27. The end of the linkage rod 27 furthest from the rotating disk 28 is rotated and sleeved onto the positioning column 26. This allows the rotating disk 28 to pull the displacement plate 25 towards the end closer to the circuit breaker 5 as it rotates. At this point, the movable support rod 20 can move to contact the base plate 7. 20 pushes the base plate 7 to move, so that the base plate 7 can drive the hook 6 to engage with the lock inside the circuit breaker 5, thereby tightening the closing spring 8. At this time, the circuit breaker 5 is in the open state. At the same time, when the displacement plate 25 is pulled to the limit position, the rotating disk 28 can also drive the cam 30 to rotate to contact the contact crossbeam 18. The side end of the contact crossbeam 18 is set in an arc shape, which can improve the smoothness of the cam 30 passing through the contact crossbeam 18. Subsequently, the cam 30 can squeeze the contact crossbeam 18 to move. The support vertical frame 17 is rotated and installed on the top of the support base 31. When the bottom end of the support vertical frame 17 is squeezed, the top end of the support vertical frame 17 can drive the contact rod 14 to move to contact the closing button at the front end of the circuit breaker 5, which can trigger the closing. At this time, The latch inside the circuit breaker 5 can release the hook 6. Furthermore, when the displacement plate 25 moves to its limit position, it can also drive the transmission gear 23 to move to the top of the second rack 38. At this time, the transmission gear 23 can move along the top of the second rack 38, causing the transmission gear 23 to drive the first rack 24 downwards, and the moving support rod 20 downwards. This allows the moving support rod 20 to be misaligned with the base plate 7, causing the base plate 7 to lose its restraining force. At this time, the elasticity of the closing spring 8 can drive the hook 6 to quickly move and reset, allowing the hook 6 to drive the contacts to close, completing the closing and opening test of the circuit breaker 5. Simultaneously, when the cam 30 rotates past the contact crossbeam 18, the weight of the contact crossbeam 18 can drive the supporting vertical frame 17. After returning to a vertical position, the contact rod 14 can disengage from the closing button on the circuit breaker 5. Subsequently, as the rotating disk 28 continues to rotate, it can drive the linkage rod 27 to push the displacement plate 25 to move and reset. Before resetting, the displacement plate 25 can activate the second hydraulic cylinder 39. The piston rod inside the second hydraulic cylinder 39 is connected to the second rack 38, so that when the second hydraulic cylinder 39 is activated, it can drive the second rack 38 to move up and down until the second rack 38 disengages from the transmission gear 23. This prevents the displacement plate 25 from driving the transmission gear 23 to move along the top of the second rack 38 when resetting. Subsequently, when the displacement plate 25 moves to its original position, it can drive the magnetic plate 21 and the iron plate 22 to contact the partition plate 35. Through the setting of the partition plate 35,The iron sheet 22 and the magnetic plate 21 can be separated. When the magnetic plate 21 separates from the iron sheet 22, the tension of the return spring 19 can drive the moving support rod 20 to move upward and reset, making it easier for the moving support rod 20 to align with the base plate 7 again. Subsequently, the above steps can be repeated to drive the moving support rod 20 to repeatedly push the base plate 7, allowing the circuit breaker 5 to perform multiple closing and opening operations. The closing spring 8 can be tested for spring fatigue and stress relaxation. When this device is in use, the tension of the return spring 19 is less than the attraction force between the iron sheet 22 and the magnetic plate 21, thus avoiding the return spring from being too strong. Spring 19 drives the movable support rod 20 to return to its original position upwards in advance. Simultaneously, four contact rods 14 are provided, each independently driven by a screw-in rod 16, allowing operation of different buttons on the circuit breaker 5. When the displacement plate 25 returns to its original position, the second hydraulic cylinder 39 is activated, driving the second rack 38 to move upwards and return to its original position. When the displacement plate 25 moves again towards the support component 2, the transmission gear 23 meshes with the second rack 38, allowing the displacement plate 25 to slide along the limit rod 37, thus supporting the displacement plate 25 to slide in a straight line and completing the operation.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for continuous and stable testing of the closing spring performance of a circuit breaker, comprising a support component (2), wherein an alignment device (1) is placed at the top of the support component (2), and a first hydraulic cylinder (3) is symmetrically fixedly installed at the top of the support component (2), and a positioning frame (4) is fixedly installed at the opposite end of the first hydraulic cylinder (3), characterized in that: The alignment device (1) includes a circuit breaker (5), a hook (6), a base plate (7), and a closing spring (8). The closing spring (8) is fixedly installed inside the circuit breaker (5). The hook (6) is fixedly installed at one end of the closing spring (8). The base plate (7) is fixedly installed at the bottom end of the hook (6). The support component (2) includes a contact device (9), a displacement device (10), a transmission device (11), and a support device (12). The contact device (9) is rotatably installed at one top end of the support device (12). The transmission device (11) is fixedly installed at the bottom end of the support device (12). The displacement device (10) is slidably inserted into the other top end of the support device (12).

2. The continuous and stable testing device for the closing spring performance of a circuit breaker according to claim 1, characterized in that: The contact device (9) includes a guide plate (13), a contact rod (14), a support back frame (15), a threaded rod (16), a support vertical frame (17), and a contact horizontal frame (18). The contact horizontal frame (18) is fixedly installed at the bottom end of the support vertical frame (17), the guide plate (13) is fixedly installed at the top end of the support vertical frame (17), the support back frame (15) is fixedly installed at the side end of the guide plate (13), the threaded rod (16) is symmetrically threaded into the side end of the support back frame (15), and the contact rod (14) is rotatably installed at one end of the threaded rod (16).

3. The continuous and stable testing device for the closing spring performance of a circuit breaker according to claim 2, characterized in that: The displacement device (10) includes a return spring (19), a moving support rod (20), a magnetic chuck (21), an iron plate (22), a transmission gear (23), a first rack (24), a displacement plate (25), and a positioning post (26). The return spring (19) is fixedly installed inside the top of the displacement plate (25). The moving support rod (20) is fixedly installed at the top of the return spring (19). The magnetic chuck (21) is fixedly installed at the top of both ends of the moving support rod (20). The first rack (24) is fixedly installed at the top of both ends of the moving support rod (20), and the first rack (24) is located at the side end of the magnetic chuck (21). The transmission gear (23) is rotatably installed at the top of both ends of the displacement plate (25). The iron plate (22) is fixedly installed at the top of the displacement plate (25). The positioning post (26) is fixedly installed at the center of the bottom end of the displacement plate (25).

4. The continuous and stable testing device for the closing spring performance of a circuit breaker according to claim 3, characterized in that: The transmission device (11) includes a linkage rod (27), a rotating disk (28), a drive motor (29), and a cam (30). The cam (30) is fixedly installed on the outer ring of the rotating disk (28), the rotating disk (28) is fixedly installed at the top center of the drive motor (29), and the linkage rod (27) is rotatably installed on the top of the rotating disk (28).

5. The circuit breaker closing spring performance continuous stability testing device according to claim 4, characterized in that: The support device (12) includes a support base (31), a movable groove (32), a support platform (33), a guide groove (34), a partition plate (35), a support side frame (36), a limiting rod (37), a second rack (38), and a second hydraulic cylinder (39). The support base (31) is fixedly installed at one end of the top of the support platform (33). The movable groove (32) is opened inside the support platform (33) near the support base (31). The guide groove (34) is opened at the other end of the top of the support platform (33). The limiting rod (37) is symmetrically fixedly installed inside the guide groove (34). The support side frame (36) is symmetrically fixedly installed at the top of the support platform (33) away from the support base (31). The partition plate (35) is fixedly installed at the top of the support side frame (36). The second rack (38) is fixedly installed at the top of the second hydraulic cylinder (39). The second hydraulic cylinder (39) is fixedly installed on both sides inside the guide groove (34).

6. The circuit breaker closing spring performance continuous stability testing device according to claim 5, characterized in that: The circuit breaker (5) is placed on the top of the support platform (33) away from the support base (31), and the drive motor (29) is fixedly installed on the bottom of the support platform (33) near the support base (31).

7. The continuous and stable testing device for the closing spring performance of a circuit breaker according to claim 6, characterized in that: The positioning column (26) is rotatably installed on the inner end of the linkage rod (27) away from the rotating disk (28), the displacement plate (25) is slidably sleeved on the outer ring of the limiting rod (37), the support frame (17) is rotatably installed on the top of the support base (31), and the first rack (24) meshes with the transmission gear (23).

8. The circuit breaker closing spring performance continuous stability testing device according to claim 7, characterized in that: The side end of the base plate (7) near the closing spring (8) is in contact with the side end surface of the moving support rod (20). The contact rod (14) is slidably inserted into the inside of the guide support plate (13). The contact crossbar (18) is horizontally aligned with the cam (30). The top center of the displacement crossbar (25) is provided with an insertion hole that matches the moving support rod (20). The magnetic suction piece (21) is vertically aligned with the iron piece (22).

9. The circuit breaker closing spring performance continuous stability testing device according to claim 8, characterized in that: The magnetic absorbing plate (21) and the iron plate (22) are inclined at 45° to the side surface of the first rack (24). The thickness of the first rack (24) and the second rack (38) is 0.5 cm. The thickness of the transmission gear (23) is 1.5 cm. The first rack (24) and the second rack (38) are staggered. The top and bottom of the side end of the partition plate (35) near the second rack (38) are inclined at 30°. The side surface of the contact crossbeam (18) away from the support vertical frame (17) is arc-shaped. The bottom end of the partition plate (35) is flush with the top end of the iron plate (22). The bottom end of the support vertical frame (17) is slidably inserted into the interior of the movable slot (32). The interior of the displacement crossbeam (25) is symmetrically provided with round holes. The interior of the support back frame (15) is provided with threaded holes. The interior of the guide plate (13) is symmetrically provided with movable holes that are compatible with the contact rod (14).

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