A residual holding force test device for magnetically controlled switches

Abstract

The present invention relates to the technical field of residual holding force testing of magnetically controlled switches, and in particular to a residual holding force testing tool for a magnetically controlled switch, comprising a tool support and a sensor, wherein the sensor is mounted on the tool support, and further comprising a fixing component, an adjusting component and a connecting component. In order to fine-tune the magnetically controlled switch and stably increase the pulling force, the present invention fixes the testing tool on the top of a switch housing through a fixing component, connects the top of a magnetically controlled operating mechanism to the tool support through a connecting component, and fixes the bottom of the magnetically controlled operating mechanism to a bottom wall of the switch housing, and then lifts one end of the tool support upward through a lever to generate an upward pulling force, which is transmitted to the sensor and the magnetically controlled operating mechanism, thereby completely separating the top and bottom of the magnetically controlled operating mechanism, and obtaining the magnitude of the opening force, thereby avoiding the situation in which the kinetic energy generated at the moment of opening causes the parts of the magnetically controlled operating mechanism to bounce up, causing collision damage to the parts, or even injuring staff.

Description

Technical Field

[0001] The invention relates to the technical field of residual holding force testing of magnetically controlled switches, and in particular to a residual holding force testing tool for a magnetically controlled switch. Background Art

[0002] The new primary and secondary integrated circuit breaker equipment is a pole-mounted circuit breaker equipment that integrates industry-leading electronic voltage sensors, electronic current sensors, electric energy metering modules, high-speed fault transient recording and other advanced technologies. The magnetic switch is an important working component inside it. Its function is to ensure that when the switch is closed, it can overcome the reaction force of the opening spring, and it also has a closing self-holding force to keep the circuit breaker reliably in the closed position. Therefore, it is necessary to test the opening force of the magnetic switch during factory production to determine whether it meets the performance requirements of the product.

[0003] In the prior art, most of the detection methods are to directly connect the magnetic switch to the tension sensor, and pull the tension sensor to open the magnetic switch to detect whether the opening force of the magnetic switch meets the product performance requirements. However, it is not convenient to fine-tune the magnetic switch and increase the tension steadily during the test. Since the traditional detection method has a large stroke for pulling the tension sensor, the kinetic energy generated at the moment of opening can easily cause the parts of the magnetic switch to bounce up, which can easily cause collision damage to the parts, or even injure the staff, and the opening speed is fast, resulting in inaccurate detection data. Summary of the invention

[0004] The object of the present invention is to provide a residual holding force testing tool for a magnetically controlled switch, which can stably and slowly pull the magnetically controlled switch until it is opened, thereby reducing the risk of damage and improving the detection accuracy.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A magnetically controlled switch residual holding force test jig is provided, comprising a jig bracket and a sensor, wherein the sensor is mounted on the jig bracket; the jig bracket further comprises a fixing assembly, an adjusting assembly and a connecting assembly, wherein both the fixing assembly and the connecting assembly are mounted on the jig bracket; the fixing assembly is used to fix the test jig on the top of a switch housing; the connecting assembly is used to connect a magnetically controlled operating mechanism, the sensor and the jig bracket; the adjusting assembly comprises a lever, wherein the lever is rotatably connected to the fixing assembly; and one end of the lever is fixedly connected to the bottom of one end of the jig bracket.

[0007] Preferably, the adjustment assembly also includes a first threaded block, a fine-adjustment screw and a bubble level. The first threaded block is installed on the fixed assembly, the fine-adjustment screw passes through the first threaded block and is threadedly connected thereto, the bottom of the fine-adjustment screw and the top of the other end of the lever are in conflict with each other, and the bubble level is installed on the top of the tooling bracket.

[0008] Preferably, the adjustment assembly further comprises a coarse adjustment screw, the coarse adjustment screw passes through the tooling bracket and is threadedly connected thereto, and the bottom of the coarse adjustment screw is threadedly connected to the connecting assembly.

[0009] Preferably, the fixing assembly includes a pair of first special-shaped plates, a first rotating shaft and a pair of first L-shaped abutment plates, the pair of first special-shaped plates are respectively located on both sides of the lever, the inner wall of the L-shaped notch at the bottom of the first special-shaped plate is fixedly connected to one of the first L-shaped abutment plates, the other first L-shaped abutment plate is fixedly connected to the inner wall of the L-shaped notch at the bottom of the other end of the tooling bracket, and the first rotating shaft passes through the pair of first special-shaped plates and the middle part of the lever and is rotatably connected thereto.

[0010] Preferably, the fixing assembly also includes a pair of second special-shaped plates, a second L-shaped support plate, a second rotating shaft, bolts and nuts. The pair of second special-shaped plates are respectively located on both sides of the tooling bracket. The second L-shaped support plate is fixedly connected to the inner wall of the L-shaped notch at the bottom of the second special-shaped plate. The second rotating shaft passes through the middle of the pair of second special-shaped plates and the tooling bracket and is rotatably connected thereto. The bolt passes through the top of the pair of second special-shaped plates and the tooling bracket and is threadedly connected to the nut.

[0011] Preferably, the tooling bracket includes a pair of U-shaped plates, a plurality of support plates, a second threaded block, a pair of sleeves, a third threaded block, a pair of screws and gaskets, the support plates and the sleeves are fixedly connected to the two U-shaped plates on both sides, the second threaded block is fixedly connected to the middle of the two U-shaped plates on both sides, the second threaded block is threadedly connected to the coarse adjustment screw, the inner wall of one sleeve is rotatably connected to the second rotating shaft, the inner wall of the other sleeve is slidably connected to the bolt, the third threaded block is fixedly connected to the bottom of one end of the U-shaped plate, the bottom of the third threaded block is in conflict with the top of one end of the lever, the top of the gasket is in conflict with the bottom of the lever, and the two screws are respectively located on both sides of the lever, the screws pass through the gasket and are threadedly connected to the third threaded block.

[0012] Preferably, a penetrating arc groove is opened on one side of the second special-shaped plate, and the arc groove is slidably connected to the bolt.

[0013] Preferably, the connecting assembly includes two pairs of connecting plates, a pair of nuts, a pair of pull rings and a pair of pins, wherein one nut is fixedly connected to the top of one side opposite to one of the pair of connecting plates, the other nut is fixedly connected to the bottom of the other side opposite to the other pair of connecting plates, the two pull rings are respectively threadedly connected to the top and bottom of the sensor, the two pull rings are respectively located between the two pairs of connecting plates, the two pins respectively pass through the two pairs of connecting plates and the two pull rings and are rotatably connected thereto, the top nut is threadedly connected to the coarse adjustment screw, and the bottom nut is threadedly connected to the fixed screw at the top of the magnetic control operating mechanism.

[0014] Preferably, a penetrating fisheye groove is provided on one side of the connecting plate, and the fisheye groove is slidably connected to the latch pin.

[0015] Beneficial effects of the present invention:

[0016] 1. First, fix the test fixture to the top of the switch housing through the fixing assembly, and connect the top of the magnetic control operating mechanism to the fixture bracket through the connecting assembly, and the bottom of the magnetic control operating mechanism is fixedly connected to the bottom wall of the switch housing. Then use the lever to push one end of the fixture bracket upward to generate an upward pulling force, which is transmitted to the sensor and the magnetic control operating mechanism. In this way, the top and bottom of the magnetic control operating mechanism are completely separated, and the magnitude of the opening force is obtained. By testing the magnitude of the opening force with this test fixture, the kinetic energy generated at the moment of opening the gate can be avoided, which will cause the parts of the magnetic control operating mechanism to bounce up, causing collision damage to the parts, or even injuring the staff.

[0017] 2. This device replaces the traditional detection method of directly pulling the sensor by rotating the fine adjustment screw, which is not only convenient to operate, but also can make the pulling force stable and slowly increase, thus improving the accuracy of the detection data. And it can make the pulling force direction and the opening direction consistent with the gravity direction, thereby eliminating the influence of force deflection angle and gravity on the sensor as much as possible, further improving the accuracy of the detection data.

[0018] 3. The present invention divides the motion state of the sensor during the detection process into two stages by respectively setting a coarse adjustment screw and a fine adjustment screw. Since the transmission efficiency of the coarse adjustment screw is greater than that of the fine adjustment screw, in the first stage, the coarse adjustment screw drives the sensor to quickly rise to a suitable position to complete the preparation work. In the second stage, the fine adjustment screw slowly drives the sensor to move slightly upward to perform the opening force detection, thereby improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a cross-sectional view of the switch housing structure of the present invention.

[0021] Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 1 .

[0022] Figure 3 It is a disassembled diagram of the switch housing and the magnetic control operating mechanism of the present invention.

[0023] Figure 4 It is a structural breakdown diagram of the magnetic control operating mechanism of the present invention.

[0024] Figure 5 The three-dimensional structure of the present invention is shown in FIG. Figure 2.

[0025] Figure 6 It is a three-dimensional structure exploded diagram of the present invention.

[0026] Figure 7 It is a disassembled diagram of the tooling support structure of the present invention.

[0027] Figure 8 It is an exploded view of the fixing component and the adjusting component structure of the present invention.

[0028] Fig. 9 It is a disassembled diagram of the fixing component structure of the present invention.

[0029] In the figure:

[0030] 1. Fixture bracket; 10. U-shaped plate; 11. Support plate; 12. Second thread block; 13. Sleeve; 14. Third thread block; 15. Screw; 16. Gasket; 17. Sensor; 18. Switch housing; 19. Magnetic control operating mechanism;

[0031] 2. Fixing assembly; 20. First special-shaped plate; 21. First rotating shaft; 22. First L-shaped abutment plate; 23. Second special-shaped plate; 230. Arc groove; 24. Second L-shaped abutment plate; 25. Second rotating shaft; 26. Bolt; 27. Nut;

[0032] 3. Adjustment assembly; 30. Lever; 31. First threaded block; 32. Fine adjustment screw; 33. Bubble level; 34. Coarse adjustment screw;

[0033] 4. Connecting assembly; 40. Connecting plate; 400. Fisheye slot; 41. Nut; 42. Pull ring; 43. Pin. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0035] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0036] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, if the term "connection" or the like appears to indicate the connection relationship between components, the term 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 components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] like Figures 1 to 9 As shown:

[0039] The tool support 1 and the sensor 17, the tool support 1 is used to support the test tool and provide an upward pulling force to the magnetic control operating mechanism 19. The sensor 17 is installed on the tool support 1, and the sensor 17 is used to convert the pulling force into an electrical signal and then transmit it to the pressure display through the output line, so as to detect the magnitude of the pulling force. It also includes a fixing component 2, an adjustment component 3 and a connecting component 4, both of which are installed on the tool support 1, the fixing component 2 is used to fix the test tool on the top of the switch housing 18, the connecting component 4 is used to connect the magnetic control operating mechanism 19 and the sensor 17 and the tool support 1, and the adjustment component 3 includes a lever 30, the lever 30 is rotatably connected to the fixing component 2, and one end of the lever 30 is fixedly connected to the bottom of one end of the tool support 1. The test tool is fixed to the top of the switch housing 18 by the fixing component 2, and the top of the magnetic control operating mechanism 19 is connected to the tool support 1 by the connecting component 4, and the bottom of the magnetic control operating mechanism 19 is fixedly connected to the bottom wall of the switch housing 18. Make the connecting component 4 and the sensor 17 in a straightened state, and then rotate the lever 30 relative to the fixed component 2. When the lever 30 rotates, one end of the tooling bracket 1 will be pushed up, and at this time, the bottom of the fixed component 2 and the top of the switch housing 18 will conflict with each other, generating an upward pulling force, and the connecting component 4 will transfer the upward pulling force to the magnetic control operating mechanism 19. When the pulling force on the magnetic control operating mechanism 19 is greater than the magnetic holding force of the magnetic control operating mechanism 19, a certain gap will be separated between the top and the bottom of the magnetic control operating mechanism 19, and the magnetic control operating mechanism 19 will be instantly demagnetized, and then the opening spring inside the magnetic control operating mechanism 19 will push the top of the magnetic control operating mechanism 19 upward. At this time, the top of the magnetic control operating mechanism 19 will move 10 mm to the top under the limit of the connecting component 4, so that the top and the bottom of the magnetic control operating mechanism 19 are completely separated, and the magnitude of the opening force is obtained. By testing the opening force with this test fixture, it is avoided that the kinetic energy generated at the moment of opening the switch causes the parts of the magnetic control operating mechanism 19 to bounce up, causing collision damage to the parts, or even injuring the staff.

[0040] like Figures 1 to 8 As shown:

[0041] The adjustment assembly 3 also includes a first threaded block 31, a fine-adjustment screw 32 and a bubble level 33. The first threaded block 31 is installed on the fixed assembly 2. The fine-adjustment screw 32 passes through the first threaded block 31 and is threadedly connected thereto. The bottom of the fine-adjustment screw 32 and the top of the other end of the lever 30 are in conflict with each other. The fine-adjustment screw 32 is rotated to move downward through the threaded transmission between it and the first threaded block 31, and one end of the lever 30 is pressed downward to the bottom, so that the lever 30 is rotated to detect the opening force. By rotating the fine-adjustment screw 32, instead of the traditional detection method of directly pulling the sensor 17, it is convenient to operate and can make the pulling force stable and slowly increase, thereby improving the accuracy of the detection data. The bubble level 33 is installed on the top of the tooling bracket 1. Before testing, adjust the magnetically controlled operating mechanism 19 to a horizontal state. After the connecting component 4 and the sensor 17 are in a stretched state, turn the fine-adjustment screw 32 to rotate the tooling bracket 1 to a certain angle. By observing the bubble level 33, adjust the tooling bracket 1 to a horizontal state, so that the pulling direction and the opening direction are consistent with the gravity direction, thereby eliminating the influence of the force deflection angle and gravity on the sensor 17 as much as possible, and further improving the accuracy of the detection data.

[0042] like Figures 1 to 8 As shown:

[0043] The adjustment component 3 also includes a coarse adjustment screw 34, which passes through the tooling bracket 1 and is threadedly connected thereto, and the bottom of the coarse adjustment screw 34 is threadedly connected to the connecting component 4. The coarse adjustment screw 34 is rotated, and the connecting component 4 is driven to move toward the top through the threaded transmission between it and the tooling bracket 1, so that the connecting component 4 and the sensor 17 are in a straightened state. At this time, the sensor 17 is in a state of just being stressed, and then the display number of the sensor 17 is reset to zero, and then the detection can be performed. By setting the coarse adjustment screw 34 and the fine adjustment screw 32 respectively, the movement state of the sensor 17 during the detection process is divided into two stages, because the transmission efficiency of the coarse adjustment screw 34 is greater than that of the fine adjustment screw 32. In the first stage, the sensor 17 is driven to rise quickly to a suitable position by the coarse adjustment screw 34 to complete the preparation work. In the second stage, the sensor 17 is slowly driven to move slightly upward by the fine adjustment screw 32 to perform the opening force detection, thereby improving the detection efficiency.

[0044] like Figures 1 to 8 As shown:

[0045] The fixing assembly 2 includes a pair of first special-shaped plates 20, a first rotating shaft 21 and a pair of first L-shaped abutment plates 22. The pair of first special-shaped plates 20 are respectively located on both sides of the lever 30. The inner wall of the L-shaped notch at the bottom of the first special-shaped plate 20 is fixedly connected to one of the first L-shaped abutment plates 22. The other first L-shaped abutment plate 22 is fixedly connected to the inner wall of the L-shaped notch at the bottom of the other end of the tooling bracket 1. The two first L-shaped abutment plates 22 contact the top and both sides of the switch housing 18 to form a clamping state, so that the tooling bracket 1 is at the top of the switch housing 18. The first rotating shaft 21 passes through the pair of first special-shaped plates 20 and the middle of the lever 30 and is rotatably connected thereto. The lever 30 can rotate relative to the fixing assembly 2 around its own middle, thereby rotating and lifting one end of the tooling bracket 1.

[0046] like Figures 1 to 8 As shown:

[0047] The fixing assembly 2 also includes a pair of second special-shaped plates 23, a second L-shaped support plate 24, a second rotating shaft 25, a bolt 26 and a nut 27. The pair of second special-shaped plates 23 are respectively located on both sides of the tooling bracket 1. The second L-shaped support plate 24 is fixedly connected to the inner wall of the L-shaped notch at the bottom of the second special-shaped plate 23. The second rotating shaft 25 passes through the middle of the pair of second special-shaped plates 23 and the tooling bracket 1 and is rotatably connected thereto. The second special-shaped plate 23 is rotated to rotate around its own middle until the second L-shaped support plate 24 and the top wall of one end of the switch housing 18 are mutually abutted, and the first L-shaped support plate 22 on the tooling bracket 1 is used to clamp the side wall of the switch housing 18, thereby limiting the detection tooling and preventing it from moving. The bolt 26 passes through the top of the pair of second special-shaped plates 23 and the tooling bracket 1 and is threadedly connected to the nut 27. After the second special-shaped plate 23 is rotated to a suitable position, the bolt 26 is moved to pass through the second special-shaped plate 23 and the fixture bracket 1 and is threadedly connected with the nut 27, so that the second special-shaped plate 23 is prevented from rotating by the friction force of the bolt 26 and the nut 27.

[0048] like Figures 1 to 7 As shown:

[0049] The tooling bracket 1 includes a pair of U-shaped plates 10, a plurality of support plates 11, a second threaded block 12, a pair of sleeves 13, a third threaded block 14, a pair of screws 15 and a gasket 16. The two sides of the support plates 11 and the sleeves 13 are fixedly connected to the two U-shaped plates 10 respectively. The support plates 11 play a role of connecting and supporting the two U-shaped plates 10, and together constitute the main body of the tooling bracket 1. The two sides of the second threaded block 12 are fixedly connected to the middle of the two U-shaped plates 10 respectively. The second threaded block 12 is threadedly connected to the coarse adjustment screw 34, and the coarse adjustment screw 34 is threadedly connected to the tooling bracket 1 through the second threaded block 12. The inner wall of one sleeve 13 is rotatably connected to the second rotating shaft 25, and the inner wall of the other sleeve 13 is slidably connected to the bolt 26. The sleeve 13 limits the rotating shaft and the bolt 26 while supporting their rotation. The third threaded block 14 is fixedly connected to the bottom of one end of the U-shaped plate 10, the bottom of the third threaded block 14 contacts the top of one end of the lever 30, the top of the gasket 16 contacts the bottom of the lever 30, and two screws 15 are respectively located on both sides of the lever 30, and the screws 15 pass through the gasket 16 and are threadedly connected to the third threaded block 14. A pair of screws 15 pass through the gasket 16 from both sides of the lever 30 and are threadedly connected to the third threaded block 14, so as to clamp and fix one end of the lever 30, so that the tooling bracket 1 rotates with the rotation of the lever 30.

[0050] like Figures 1 to 9 As shown:

[0051] A through arc groove 230 is provided on one side of the second special-shaped plate 23, and the arc groove 230 is slidably connected to the bolt 26. Through the arc groove 230, the bubble level 33 can be used to adjust the angle of the tooling bracket 1 first, and then the second special-shaped plate 23 is rotated to clamp the switch housing 18, thereby fixing the position of the test tooling.

[0052] like Figures 1 to 6 As shown:

[0053] The connection assembly 4 includes two pairs of connection plates 40, a pair of nuts 41, a pair of pull rings 42 and a pair of latches 43, wherein one nut 41 is fixedly connected to the top of one side opposite to the other pair of connection plates 40, and the other nut 41 is fixedly connected to the bottom of the other side opposite to the other pair of connection plates 40, and the two pull rings 42 are respectively threadedly connected to the top and bottom of the sensor 17, and the two pull rings 42 are respectively located between the two pairs of connection plates 40, and the two latches 43 respectively pass through the two pairs of connection plates 40 and the two pull rings 42 and are rotatably connected thereto, and the top nut 41 is threadedly connected to the coarse adjustment screw 34, and the bottom nut 41 is threadedly connected to the fixed screw at the top of the magnetic control operating mechanism 19. The connection assembly 4 can transmit the pulling force of the tooling bracket 1 to the sensor 17 and the magnetic control operating mechanism 19. The connection assembly 4 can be quickly assembled and the magnetic control operating mechanism 19 can be connected to the connection assembly 4 by means of threaded connection and plugging of the latch 43, and the plugging of the latch 43 can also rotate the angle of the connection assembly 4, shorten the length of the connection assembly 4, and facilitate installation.

[0054] like Figures 1 to 6 As shown:

[0055] A through fisheye slot 400 is provided on one side of the connecting plate 40, and the fisheye slot 400 is slidably connected to the latch 43. The setting of the fisheye slot 400 can provide the space required for the opening stroke. When the magnetic control operating mechanism 19 is opened, its top and bottom are separated. When the opening spring inside the magnetic control operating mechanism 19 pushes the top of the magnetic control operating mechanism 19 upward, the latch 43 slides in the fisheye slot 400, thereby preventing the connection component 4 from blocking the opening of the magnetic control operating mechanism 19.

[0056] It should be noted that the above specific implementations are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art should understand that various modifications, equivalent substitutions, changes, etc. can be made to the present invention. However, as long as these changes do not deviate from the spirit of the present invention, they should be within the scope of protection of the present invention. In addition, some terms used in the specification and claims of this application are not limiting, but are only for the convenience of clearly describing the positional relationship and function between the various components.

Claims

1. A magnetic switch residual holding force test fixture, comprising a fixture bracket (1) and a sensor (17), wherein the sensor (17) is mounted on the fixture bracket (1), and characterized in that: The invention also comprises a fixing component (2), an adjusting component (3) and a connecting component (4), wherein the fixing component (2) and the connecting component (4) are both mounted on a tooling bracket (1), the fixing component (2) is used to fix the test tooling on the top of the switch housing (18), the connecting component (4) is used to connect the magnetic control operating mechanism (19) and the sensor (17) as well as the tooling bracket (1), and the adjusting component (3) comprises a lever (30), the lever (30) is rotatably connected to the fixing component (2), and one end of the lever (30) is fixedly connected to the bottom of one end of the tooling bracket (1).

2. A magnetic switch residual holding force test tool according to claim 1, characterized in that: The adjustment assembly (3) further comprises a first threaded block (31), a fine adjustment screw (32) and a bubble level (33); the first threaded block (31) is mounted on the fixed assembly (2); the fine adjustment screw (32) passes through the first threaded block (31) and is threadedly connected thereto; the bottom of the fine adjustment screw (32) abuts against the top of the other end of the lever (30); and the bubble level (33) is mounted on the top of the tooling bracket (1).

3. A magnetic switch residual holding force testing tool according to claim 2, characterized in that: The adjustment assembly (3) also includes a coarse adjustment screw (34), which passes through the tooling bracket (1) and is threadedly connected thereto, and the bottom of the coarse adjustment screw (34) is threadedly connected to the connection assembly (4).

4. A magnetic switch residual holding force testing tool according to claim 1, characterized in that: The fixing assembly (2) comprises a pair of first special-shaped plates (20), a first rotating shaft (21) and a pair of first L-shaped abutment plates (22); the pair of first special-shaped plates (20) are respectively located on both sides of the lever (30); the inner wall of the L-shaped notch at the bottom of the first special-shaped plates (20) is fixedly connected to one of the first L-shaped abutment plates (22); the other first L-shaped abutment plate (22) is fixedly connected to the inner wall of the L-shaped notch at the bottom of the other end of the tooling bracket (1); the first rotating shaft (21) passes through the pair of first special-shaped plates (20) and the middle part of the lever (30) and is rotatably connected thereto.

5. A magnetic switch residual holding force testing tool according to claim 4, characterized in that: The fixing assembly (2) further comprises a pair of second special-shaped plates (23), a second L-shaped abutment plate (24), a second rotating shaft (25), a bolt (26) and a nut (27); the pair of second special-shaped plates (23) are respectively located on both sides of the tooling bracket (1); the second L-shaped abutment plate (24) is fixedly connected to the inner wall of the L-shaped notch at the bottom of the second special-shaped plates (23); the second rotating shaft (25) passes through the middle of the pair of second special-shaped plates (23) and the tooling bracket (1) and is rotatably connected thereto; the bolt (26) passes through the top of the pair of second special-shaped plates (23) and the tooling bracket (1) and is threadedly connected to the nut (27).

6. The residual holding force testing tool for a magnetic switch according to claim 1, characterized in that: The tooling bracket (1) comprises a pair of U-shaped plates (10), a plurality of support plates (11), a second threaded block (12), a pair of sleeves (13), a third threaded block (14), a pair of screws (15) and a gasket (16). The two sides of the support plates (11) and the sleeves (13) are respectively fixedly connected to the two U-shaped plates (10). The two sides of the second threaded block (12) are respectively fixedly connected to the middle of the two U-shaped plates (10). The second threaded block (12) is threadedly connected to the coarse adjustment screw (34). One of the sleeves (14) is fixedly connected to the coarse adjustment screw (34). The inner wall of the sleeve (13) is rotatably connected to the second rotating shaft (25), the inner wall of the other sleeve (13) is slidably connected to the bolt (26), the third threaded block (14) is fixedly connected to the bottom of one end of the U-shaped plate (10), the bottom of the third threaded block (14) and the top of one end of the lever (30) are in contact with each other, the top of the gasket (16) and the bottom of the lever (30) are in contact with each other, and the two screws (15) are respectively located on both sides of the lever (30), and the screws (15) pass through the gasket (16) and are threadedly connected to the third threaded block (14).

7. A magnetic switch residual holding force testing tool according to claim 6, characterized in that: A penetrating arc groove (230) is formed on one side of the second special-shaped plate (23), and the arc groove (230) is slidably connected to the bolt (26).

8. The residual holding force testing tool for a magnetic switch according to claim 1, characterized in that: The connection assembly (4) comprises two pairs of connection plates (40), a pair of nuts (41), a pair of pull rings (42) and a pair of latches (43), wherein one nut (41) is fixedly connected to the top of one side opposite to the pair of connection plates (40), the other nut (41) is fixedly connected to the bottom of the other side opposite to the other pair of connection plates (40), the two pull rings (42) are respectively threadedly connected to the top and bottom of the sensor (17), the two pull rings (42) are respectively located between the two pairs of connection plates (40), the two latches (43) respectively pass through the two pairs of connection plates (40) and the two pull rings (42) and are rotatably connected thereto, the top nut (41) is threadedly connected to the coarse adjustment screw (34), and the bottom nut (41) is threadedly connected to the fixed screw at the top of the magnetic control operating mechanism (19).

9. A magnetic switch residual holding force testing tool according to claim 8, characterized in that: A penetrating fisheye groove (400) is provided on one side of the connecting plate (40), and the fisheye groove (400) is slidably connected to the latch (43).

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