A plug-in test device for contact fingers

Abstract

The present invention relates to the technical field of test devices for high-voltage switches, and in particular to a contact finger plug-in test device. The contact finger plug-in test device comprises a frame, a movable contact, and a contact finger fixing cylinder fixed to the frame. The contact finger fixing cylinder is provided with a fixing structure for mounting the contact finger to be tested, and the contact finger fixing cylinder has an opening for the movable contact to pass through. The movable contact can be inserted into the contact finger fixing cylinder to squeeze the contact finger to be tested, and can also be pulled out of the contact finger fixing cylinder. The contact finger plug-in test device also includes a drive mechanism for driving the movable contact to move back and forth.

Description

Technical Field

[0001] The present invention relates to the technical field of test devices for high-voltage switches, and in particular to a plug-in test device for contact fingers. Background Art

[0002] During on-site operation of power grids, high-voltage switches conduct current, and their dynamic and electrostatic contact areas (contacts and contact fingers) are core components. The service life of the contact fingers determines the life of the high-voltage switch, and thus the safe operation of the high-voltage transmission and transformation grid. However, because most designers believe that high-voltage switchgear is simple in structure, they do not pay sufficient attention to the high-voltage switch or the contact finger / contact matching structure of the high-voltage switch during design. This has led to many problems during the operation of the high-voltage switch. For example, due to insufficient simulation computing capabilities in the design, the contact finger / contact matching structure is designed based solely on manual calculations and empirical judgment. This often results in insufficient contact clamping force, resulting in excessive contact resistance and contact heating, which can cause accidents during operation.

[0003] In order to avoid the above situation, the contact finger structure is usually verified by plug-in test after being designed. However, there is currently no test device specifically used to verify the plug-in force variation law of the contact finger after 10,000 plug-in tests. In the prior art, the contact finger is usually installed on an actual high-voltage switch for plug-in test. Generally, after 10,000 plug-ins, the high-voltage switch is disassembled, and then the stress and silver layer surface of the contact finger after the test are tested. The quality of the contact finger is determined based on the test results. If the contact finger is unqualified, the structure of the contact finger will be redesigned and manufactured, and the redesigned contact finger will be installed again for testing. However, when installing the contact finger, the high-voltage switch needs to be disassembled and assembled, which is cumbersome, and the opening and closing process of the high-voltage switch is slow, resulting in a long test cycle and high cost. Moreover, the installation test cannot dynamically monitor the variation law of parameters such as plug-in force. Summary of the Invention

[0004] The purpose of the present invention is to provide a plug-in test device for contact fingers, so as to solve the technical problems in the prior art of inconvenient assembly and disassembly, long cycle and high cost during installation and testing.

[0005] The technical solution of the contact finger plugging and unplugging test device of the present invention is:

[0006] A plug-in and pull-out test device for contact fingers includes a frame, a moving contact, and a contact finger fixing cylinder fixed to the frame. The contact finger fixing cylinder is provided with a fixing structure for mounting the contact finger to be tested, and the contact finger fixing cylinder has a through-hole for the moving contact to pass through. The moving contact can be inserted into the contact finger fixing cylinder and squeeze the contact finger to be tested, and can also be pulled out from the contact finger fixing cylinder. The plug-in and pull-out test device for contact fingers also includes a driving mechanism for driving the moving contact to move back and forth.

[0007] Beneficial effects: When the plug-in test device is used, first fix the contact finger fixing cylinder on the frame, and install the contact finger to be tested on the contact finger fixing cylinder through the fixing structure, and then start the driving mechanism. The driving mechanism can drive the moving contact to move back and forth. During the reciprocating movement of the moving contact, it can be inserted into the contact finger fixing cylinder and can also be pulled out from the contact finger fixing cylinder, thereby simulating the plug-in and pull-out process. After the test, the contact finger can be removed for testing. Compared with the prior art that uses a high-voltage switch for on-machine testing, the contact finger plug-in test device provided by the present invention can simulate the plug-in and pull-out action between the contact finger and the moving contact, and has a simple structure, is easy to disassemble and install, and has a low cost. Moreover, the present invention uses another driving mechanism to drive the moving contact to move, and the opening and closing process is faster than that in the prior art, and the test cycle is shorter.

[0008] Furthermore, the driving mechanism includes a connecting rod mechanism connected to the moving contact and a driving motor connected to the connecting rod mechanism. The driving mechanism also includes a force spring for applying force to the connecting rod mechanism when the moving contact is inserted into the contact finger fixing cylinder.

[0009] Beneficial effect: The force is provided to the connecting rod mechanism by the force-adding spring. When the moving contact is inserted into the contact finger fixing cylinder, the moving contact is in a high-speed motion state, thereby simulating the closing process in the circuit breaker.

[0010] Furthermore, the connecting rod mechanism includes a pull rod which is guided and assembled on the frame and connected to the moving contact, the force spring is sleeved on the pull rod, one end of the force spring presses on the pull rod, and the other end presses on the frame, when the pull rod moves away from the contact finger fixing cylinder, the force spring is compressed to store energy, and when the stored energy of the force spring is released, an elastic force is applied to the pull rod toward the contact finger fixing cylinder; the connecting rod mechanism also includes a connecting rod eccentrically hinged on the output shaft of the drive motor, the other end of the connecting rod is hinged to a sliding rod, and the sliding rod is assembled on the frame in a reciprocating manner toward and away from the contact finger fixing cylinder, and the drive motor is used to drive the sliding rod to slide back and forth; the pull rod is away from the moving contact A hook with an upward opening is provided at one end, and a hook rod is provided at the corresponding end of the slide rod, and a hook guiding lifting inclined surface is provided at the end of the hook facing the slide rod. When the driving motor drives the slide rod to slide toward the finger fixing tube, the hook guiding lifting inclined surface lifts the hook rod upward so that the hook rod falls into the hook under its own weight, and when the driving motor drives the slide rod to slide away from the finger fixing tube, the pulling rod is pulled to move to compress the force spring; a frame guiding lifting inclined surface is provided on the frame, and the frame guiding lifting inclined surface is used to lift the hook rod upward when the slide rod slides away from the finger fixing tube and the force spring stores energy in place to disengage the hook rod from the hook and release the energy stored in the force spring.

[0011] Furthermore, the two ends of the hook rod protrude from the sliding rod arrangement, and the frame is provided with a supporting surface for supporting the two ends of the hook rod, and the frame guide lifting inclined surface is formed on the supporting surface. When the sliding rod slides back toward the finger fixing tube, the two ends of the hook rod are lifted upward under the action of the frame guide lifting inclined surface to disengage the hook rod from the hook.

[0012] Furthermore, the frame is provided with vertically arranged baffles disposed at both ends of the hook rod, and the two ends of the hook rod are engaged with the baffles on the corresponding side to constrain the reciprocating sliding of the slide rod.

[0013] Beneficial effect: The setting of the baffle can better constrain the reciprocating sliding of the slide bar, and the slide bar slides more smoothly.

[0014] Furthermore, the hook rod is rotatably mounted on the slide rod around its own axis.

[0015] Beneficial effects: the hook rod is rotatably mounted on the slide rod, so that the hook rod can roll on the supporting surface, reducing the friction force on the hook rod and extending the service life of the hook rod.

[0016] Furthermore, the frame includes vertical plates arranged at both ends of the force spring, one end of the force spring presses on a vertical plate facing away from the contact finger fixing tube; a stopping step is fixed on the pull rod, and the other end of the force spring presses on the stopping step; a buffer pad is provided on one of the two vertical plates close to the contact finger fixing tube, and the buffer pad is used to cooperate with the stopping step.

[0017] Beneficial effect: The buffer pad can cooperate with the stop step to limit the movement limit of the pull rod and the moving contact. At the same time, the buffer pad can buffer the pull rod, which can not only reduce the impact force of the pull rod on the opposing plate, but also reduce the sound of the pull rod impact and reduce noise pollution.

[0018] Furthermore, the contact finger plugging and unplugging test device further includes a strain gauge for being arranged on the contact finger to be tested and a monitoring device connected to the strain gauge, and the monitoring device is used to monitor the stress change of the contact finger to be tested during the plugging and unplugging process.

[0019] Beneficial effect: The monitoring device can monitor the stress changes of the contact finger to be tested in real time through the strain gauge, so that the stress change law of the contact finger to be tested can be dynamically monitored.

[0020] Furthermore, the plug-in and pull-out test device for the contact fingers also includes a conductive tube, in which a conductive contact finger is provided, and the movable contact is installed in the conductive tube and connected to the conductive contact finger; the plug-in and pull-out test device for the contact fingers also includes a wire connected to the contact finger fixing tube and the conductive tube, and a monitoring device connected to the wire to monitor the resistance in the circuit.

[0021] Beneficial effect: By testing the resistance in the loop, the conductivity of the contact finger to be tested during the plugging and unplugging process can be indirectly monitored for real-time monitoring.

[0022] Furthermore, the fixing structure is a shielding cover that is buckled onto the contact finger fixing cylinder, and the shielding cover is used to press the contact finger to be tested onto the contact finger fixing cylinder.

[0023] Beneficial effect: The shielding cover is used to press the contact finger to be tested onto the contact finger fixing cylinder, which has a simple structure and is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 1 is a schematic structural diagram of a contact finger insertion and extraction test device according to embodiment 1 of the present invention;

[0025] Figure 2 yes Figure 1 A top view of

[0026] Figure 3 yes Figure 2 Cross-sectional view at AA in the middle;

[0027] Figure 4 1 is a schematic structural diagram of the driving mechanism in Example 1 of the contact finger insertion and extraction test device of the present invention;

[0028] Figure 5 This is a schematic diagram of the contact finger fixing cylinder, the conductive cylinder and the moving contact in Example 1 of the contact finger plugging and unplugging test device of the present invention;

[0029] Figure 6 1 is a schematic structural diagram of a self-powered contact finger in Example 1 of the contact finger insertion and extraction test device of the present invention;

[0030] Figure 7 Schematic diagram of the contact finger fixing cylinder, the movable contact and the spring contact finger in Example 2 of the contact finger plugging and unplugging test device of the present invention;

[0031] Figure 8 1 is a schematic structural diagram of a spring contact finger in Example 2 of a contact finger plugging and unplugging test device of the present invention.

[0032] Explanation of the accompanying symbols: 1. Moving contact; 2. Contact finger fixing cylinder; 3. Pull rod; 4. Insert cavity; 5. Contact finger; 6. Self-powered contact finger; 7. Shielding cover; 8. Spring contact finger; 9. Conductive cylinder; 10. Base frame; 11. Vertical plate; 12. First vertical plate; 13. Second vertical plate; 14. Third vertical plate; 15. Driving motor; 16. Crank; 17. Connecting rod; 18. Sliding rod; 19. Hook; 20. Sliding seat; 21. Guide groove; 22. Hooking rod; 23. Force spring; 24. Stop step; 25. Buffer seat; 26. Buffer pad; 27. Connecting rod; 28. Nut; 29. Monitoring device; 30. Articulated shaft; 31. Slide groove; 32. Sliding plane; 33. Guide plate; 34. Fixed plate; 35. Matching inclined surface; 36. Base. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0035] It should be noted that, in the specific embodiments of the present invention, terms such as "first" and "second" and other relational terms that may appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of such an actual relationship or order between these entities or operations. Moreover, terms such as "include", "comprise" or any other variants thereof that may appear are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the phrase "including a ..." and other defined elements that may appear do not exclude the presence of other identical elements in the process, method, article or device that includes the elements.

[0036] In the description of the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," and "connected" should be interpreted broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0037] In the description of the present invention, unless otherwise expressly specified or limited, the terms "provided with" and "provided with" should be understood broadly. For example, the object "provided with" may be a part of the main body, or may be arranged separately from the main body and connected to the main body. The connection may be detachable or non-detachable. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] The present invention is described in further detail below with reference to the examples.

[0039] Example 1 of the contact insertion and extraction test device provided in the present invention:

[0040] like Figures 1 to 6As shown, the contact finger insertion and extraction test device includes a frame, a movable contact 1, a contact finger fixing cylinder 2 and a conductive cylinder 9 fixed to the frame, and a pull rod 3 mounted on the frame for left and right guide movement. It also includes a drive mechanism for driving the pull rod 3 to move back and forth. The contact finger fixing cylinder 2 and the conductive cylinder 9 are spaced apart and have the same structure. The contact finger fixing cylinder 2 will now be described as an example. The contact finger fixing cylinder 2 is a cylindrical body, and the movable contact 1 is also a circular cylinder. The contact finger fixing cylinder 2 has an insertion cavity 4 for inserting the movable contact 1. The cavity 4 serves as the opening of the contact finger fixing cylinder 2 for the movable contact 1 to pass through. A contact finger 5 is fixed to the contact finger fixing cylinder 2, specifically a self-supporting contact finger 6 in this embodiment. A shielding cover 7 is mounted on the outer periphery of the contact finger fixing cylinder 2, which presses the contact finger 5 onto the contact finger fixing cylinder 2. The contact finger fixing cylinder 2 is arranged opposite to the insertion cavity 4 of the conductive cylinder 9. The moving contact 1 is slidably assembled in the insertion cavity 4 of the conductive cylinder 9. The pull rod 3 is fixed to the moving contact 1. The driving mechanism drives the pull rod 3 to move back and forth, and the reciprocating pull rod 3 then drives the moving contact 1 to move back and forth. When the moving contact 1 moves to the left, it can be inserted into the contact finger fixing cylinder 2. When the moving contact 1 moves to the right, it can be pulled out of the contact finger fixing cylinder 2. It should be noted that when the moving contact 1 slides in the insertion cavity 4 of the conductive cylinder 9, it is always in a state of mutual compression with the contact fingers 5 on the conductive cylinder 9. When the moving contact 1 is inserted into the contact finger fixing cylinder 2, it is also in a state of mutual compression with the contact fingers 5 on the contact finger fixing cylinder 2. The contact fingers 5 in the conductive cylinder 9 are the conductive contact fingers connected to the moving contact 1. In addition, the structures including the contact finger fixing cylinder 2, conductive cylinder 9, movable contact 1, contact finger 5, shielding cover 7 and pull rod 3 are designed and manufactured with reference to the relevant structures of circuit breakers in the prior art, so as to simulate the most realistic circuit breaker plugging and unplugging process.

[0041] The frame includes a base frame 10 and vertical plates 11 arranged on the base frame 10. Three vertical plates 11 are arranged at intervals on the left and right, namely, the first vertical plate 12, the second vertical plate 13, and the third vertical plate 14 from left to right. The contact finger fixing cylinder 2 is fixed to the first vertical plate 12, and the conductive cylinder 9 is fixed to the second vertical plate 13. The contact finger fixing cylinder 2 and the conductive cylinder 9 are both fixed to the corresponding vertical plates 11 by bolts. The conductive cylinder 9, the second vertical plate 13, and the third vertical plate 14 are respectively provided with through holes extending left and right. The pull rod 3 is installed in the through holes on these three, thereby guiding the pull rod 3 to be moved and assembled on the frame. In this embodiment, the left end of the pull rod 3 has an external thread, and the moving contact 1 is provided with a threaded hole that mates with the external thread on the pull rod 3. That is, the pull rod 3 and the moving contact 1 are fixed to each other by threaded assembly.

[0042] The driving mechanism includes a driving motor 15 fixed to the base frame 10, a crank 16 fixed to the output shaft of the driving motor 15, a slide bar 18 that is assembled on the frame and slides back and forth and can drive the pull rod 3 to move to the right, and a connecting rod 17 that is hinged to the slide bar 18 at one end and hinged to the crank 16 at the other end. The end of the slide bar 18 that is not hinged to the connecting rod 17 is hooked on the pull rod 3. In order to facilitate the hooking between the pull rod 3 and the slide bar 18, the right end of the pull rod 3 is provided with a hook 19 with an upward opening. The end of the slide bar 18 for hooking is provided with a hook rod 22. The hook rod 22 can be hooked on the hook 19 to achieve the hooking between the pull rod 3 and the slide bar 18.

[0043] The frame also includes a sliding base 20 fixed to the base frame 10. The sliding base 20 includes a base 36, a fixing plate 34, and a guide plate 33 fixed to the base 36. The base 36 has a sliding groove 31 extending left and right, and the sliding rod 18 is slidably mounted within the sliding groove 31. The groove 31 has sliding planes 32 extending left and right on both sides of the groove wall. The sliding rod 18 includes two spaced-apart plates with corresponding through-holes. The hook rod 22 is rotatably mounted in the through-holes of the two plates, and the ends of the hook rod 22 extend from the corresponding plates so that both ends of the hook rod 22 are supported on the corresponding sliding planes 32. Similarly, the ends of the sliding rod 18 and the connecting rod 17 are hingedly provided with hinge holes. The hinge holes of the sliding rod 18 and the connecting rod 17 are rotatably mounted, and the ends of the hinge shaft 30 extend from the corresponding hinge holes so that both ends of the hinge shaft 30 are supported on the corresponding sliding planes 32. Thus, during the reciprocating movement of the slide bar 18, both the hook rod 22 and the hinge shaft 30 can roll on the sliding plane 32 (i.e., both the hook rod 22 and the hinge shaft 30 are in rolling engagement with the sliding plane 32). In addition, a limiting wall is provided on the upper side of the sliding plane 32 that is in rolling engagement with the hinge shaft 30. The limiting wall and the sliding plane 32 form a guide groove 21 extending left and right. The end of the hinge shaft 30 extends into the guide groove 21. Thus, during the reciprocating movement of the slide bar 18, the hinge shaft 30 always moves within the guide groove 21. The guide groove 21 can be engaged with the hinge shaft 30 in the vertical direction to prevent the hinge shaft 30 from moving up and down during movement, thereby making the movement of the slide bar 18 and the connecting rod 17 more stable.

[0044] Two guide plates 33 are provided, and the two guide plates 33 are arranged corresponding to the two sliding planes 32. In this embodiment, the guide plates 33 are trapezoidal plates, and the bottom surface of the trapezoidal plates is arranged in contact with the sliding plane 32 on the sliding plane 32 in rolling engagement with the hook rod 22. When the slide rod 18 pulls the pull rod 3 to the right, when the hook rod 22 moves to the inclined surface on the left side of the guide plate 33, the hook rod 22 rolls upward along the inclined surface, thereby lifting the left end of the slide rod 18 upward by the inclined surface until the hook rod 22 disengages from the hook 19. At this point, the moving contact 1 has been pulled out of the contact finger fixing cylinder 2. After the slide rod 18 disengages from the pull rod 3, the drive mechanism drives the pull rod 3 to the left, allowing the moving contact 1 to be inserted into the contact finger fixing cylinder 2.

[0045] In this embodiment, the hook 19 has a hook guiding lifting inclined surface at the end facing the slide rod 18. After the slide rod 18 is disengaged from the pull rod 33 and moves to the left, when the hook rod 22 moves to the hook guiding lifting inclined surface of the hook 19, the hook rod 22 will roll upward along the hook guiding lifting inclined surface until the hook rod 22 falls into the hook 19 under the action of its own gravity. At this time, the hook rod 22 is hooked on the hook 19, that is, the slide rod 18 and the pull rod 3 are hooked.

[0046] In this embodiment, two fixing plates 34 are provided, and the two fixing plates 34 are respectively fixed on the outer sides of the groove walls on both sides of the slide groove 31. Corresponding threaded holes are provided on the fixing plates 34, the groove walls of the slide groove 31, and the guide plates 33. When fixing the sliding seat 20 and the guide plate 33, bolts are used to be threadedly connected to the threaded holes on the fixing plates 34, the groove walls of the slide groove 31, and the guide plates 33, thereby achieving the fixation of the guide plate 33 and the sliding seat 20.

[0047] It should be noted that during rolling, the ends of the hook rod 22 are blocked by the walls of the chute 21 and the fixing plate 34, preventing the hook rod 22 from separating from the slide bar 18. During rolling, the ends of the hinge shaft 30 are blocked by the walls of the guide chute 21, preventing the hinge shaft 30 from separating from the slide bar 18 and the connecting rod 17. Furthermore, the bottom of the chute 21 includes a matching bevel 35, which prevents the connecting rod 17 from interfering with the bottom of the chute 31 during movement.

[0048] The drive mechanism also includes a force spring 23 mounted on the outside of the pull rod 3. This force spring 23 is a compression spring, with its right end pressing against the third vertical plate 14. A stop step 24 protrudes from the left end of the force spring 23 on the pull rod 3, against which the left end of the force spring 23 presses. As the pull rod 3 moves rightward, the stop step 24 compresses the force spring 23, storing energy. When the connecting rod 17 disengages from the slide bar 18, the force spring 23 instantly releases the energy. The elastic force of the force spring 23 acts on the stop step 24, rapidly moving the movable contact 1 and allowing it to quickly insert into the contact finger retaining cylinder 2. This rapid release of the force spring 23 simulates the rapid impact of the movable contact 1 in a circuit breaker. This allows the entire test process to more closely resemble actual circuit breaker operating conditions, resulting in more accurate and effective test results.

[0049] To cushion the instantaneous force of the pull rod 3, a buffer seat 25 is provided on the second vertical plate 13, and a buffer pad 26 is provided on the buffer seat 25. When the pull rod 3 moves leftward, the stop step 24 on the pull rod 3 hits the buffer pad 26. It should be noted that the conductive tube 9, buffer seat 25, and buffer pad 26 are fixed to the second vertical plate 13 by a common set of bolts.

[0050] In this embodiment, the vertical plates 11 are slidably mounted on the base frame 10. Specifically, the base frame 10 is provided with slide rails extending left and right. A bottom plate is provided at the bottom of each vertical plate 11. The bottom plate is provided with a sliding block that slides and is mounted on the slide rail. The cooperation between the sliding block and the slide rail enables the position of each vertical plate 11 on the base frame 10 to be adjusted. The position of each vertical plate 11 is adjusted according to the size of the movable contact 1, the contact finger fixing cylinder 2, and other structures, facilitating the installation of the entire contact finger plug-in test device. Fastening bolts are installed on the bottom plate of each vertical plate 11. After each vertical plate 11 is adjusted in position, the bottom plate is fixed to the base frame 10 by fastening bolts to achieve the fixation of the vertical plate 11 to the base frame 10. In addition, in order to enhance the impact resistance of each vertical plate 11, a connecting rod 27 is installed on the three vertical plates 11, and the connecting rod 27 is a threaded rod. When the position of each vertical plate 11 on the base frame 10 is adjusted, nuts 28 are screwed on the left and right sides of the first vertical plate 12 to position the first vertical plate 12, a nut 28 is screwed on the left side of the second vertical plate 13 to stop the second vertical plate 13, and a nut 28 is screwed on the right side of the third vertical plate 14 to stop the third vertical plate 14.

[0051] The plugging and unplugging process of the contact finger plugging and unplugging test device of the present invention is as follows:

[0052] by Figure 1 、 Figure 2 、 Figure 3The plug-in and pull-out test device for the middle contact finger is in the starting state, the slide rod and the pull rod 3 are in the disengaged state, and when the drive motor 15 drives the crank 16 to rotate clockwise, it can drive the slide rod 18 to move to the left until the hook rod 22 on the slide rod 18 gradually slides to the left along the hook guide lifting slope of the hook 19 and finally the hook rod 22 is hooked on the hook 19. The output shaft of the drive motor 15 continues to rotate clockwise, and the slide rod 18 drives the pull rod 3 to move to the right. When the hook rod 22 moves to the inclined surface on the left side of the guide plate 33, the hook rod 22 rolls upward along the inclined surface, so that the left end of the slide rod 18 is lifted by the inclined surface until the hook rod 22 disengages from the hook 19. At this time, the force spring 23 completes energy storage (the moving contact 1 has been pulled out of the contact finger fixing tube 2). The force spring 23 is instantly released to push the pull rod 3 to the left. When the pull rod 3 hits the buffer pad 26, the pull rod 3 stops moving. At this time, the moving contact 1 is inserted into the contact finger fixing tube 2. It should be noted that the output shaft of the drive motor 15 always keeps rotating clockwise, and the contact finger plug-in test device repeats the above process. Every time the output shaft of the drive motor 15 rotates one circle, the contact finger plug-in test device completes a plug-in and pull-out process.

[0053] In addition, the contact finger plug-in and pull-out test device also includes a monitoring device 29, which is integrated with a stress tester, a dynamic resistance tester, a speed sensor, and a counter. The stress tester monitors the stress changes of the contact finger 5 in real time during the plug-in and pull-out process through the stress plate set on the contact finger 5; the dynamic resistance tester is connected to the contact finger fixing tube 2 and the conductive tube 9 through wires to form an electric circuit. When the moving contact 1 is inserted into the contact finger fixing tube 2, the dynamic resistance tester energizes the wires to measure the resistance of the contact finger fixing tube 2, the conductive tube 9, and the moving contact 1 as a whole. This resistance is the resistance in the circuit; the speed sensor measures the moving speed of the moving contact 1 through a sensor; and the counter detects the number of rotations of the motor through a sensor to count the number of plug-in and pull-out processes. The above-mentioned stress tester, dynamic resistance tester, speed sensor, and counter are all existing technologies, and the specific structure will not be repeated here.

[0054] In this embodiment, the pull rod 3, the slide rod 18, the connecting rod 17 and the crank 16 cooperate to form a connecting rod mechanism connected to the moving contact 1 and the drive motor 15; the inclined surface of the guide plate 33 on the left side constitutes a frame guide lifting inclined surface for lifting the hook rod 22 upward to disengage the hook rod 22 from the hook 19 when the slide rod 18 slides away from the contact finger fixing cylinder 2 and the force spring 23 is in place; the inclined surface of the guide plate 33 on the left side and the top surface of the guide plate 33 constitute support surfaces for supporting both ends of the hook rod 22; the groove walls on both sides of the slide groove 31 constitute vertically arranged baffles respectively arranged at both ends of the hook rod 22, and the two ends of the hook rod 22 cooperate with the baffles on the corresponding side to constrain the reciprocating sliding of the slide rod 18; the contact finger 5 on the contact finger fixing cylinder 2 is the contact finger to be tested, and the contact finger 5 on the conductive cylinder 9 is the conductive contact finger 5; the shielding cover 7 constitutes a fixed structure on the contact finger fixing cylinder 2 for mounting the contact finger to be tested;

[0055] It should be noted that in this embodiment, the contact finger plug-in and pull-out test device simulates the plug-in and pull-out process of a circuit breaker, and therefore requires the use of a force spring 23 to achieve rapid movement of the movable contact 1. In other embodiments, if the contact finger plug-in and pull-out test device simulates the plug-in and pull-out process of an isolating switch, the movable contact does not need to move rapidly. In this case, the slide bar and the pull rod can be hinged. When the output shaft of the drive motor rotates, the connecting rod drives the pull rod to move back and forth to achieve reciprocating movement of the movable contact. In this case, the force spring is not required for force application, and the plug-in and pull-out requirements of the movable contact and the contact finger to be tested can be met solely by the output of the drive motor. Alternatively, in other embodiments, the drive mechanism is a drive cylinder, the piston rod of which is fixed to the movable contact, and the piston rod drives the movable contact to move back and forth when it is extended or retracted. In this case, the contact finger plug-in and pull-out test device also simulates the plug-in and pull-out process of an isolating switch. Of course, the drive cylinder can also be replaced with a linear motion mechanism such as an electric push rod, a lead screw and a nut mechanism.

[0056] The embodiment 2 of the contact finger insertion and extraction test device provided in the present invention is different from the embodiment 1 in that Figure 7 、 Figure 8 As shown, the contact fingers 5 are replaced with spring contact fingers 8. In this embodiment, only one contact finger fixing cylinder 2 is provided, which is fixed between the first vertical plate 12 and the second vertical plate 13. The movable contact 1 adopts a hollow rod structure. The insertion and removal process between the movable contact 1 and the contact finger fixing cylinder 2 is the same as that in Example 1. Alternatively, in other embodiments, the contact fingers can also be replaced with petal-shaped contact fingers, and the structures of the movable contact and the contact finger fixing cylinder are also adaptively changed accordingly.

[0057] Embodiment 3 of the contact finger plugging and unplugging test device provided in the present invention is different from embodiment 1 in that, in this embodiment, no buffer seat and buffer pad are provided on the second vertical plate, and the stopping step is used to cooperate with the second vertical plate for stopping.

[0058] Embodiment 4 of the plug-in and pull-out test device for contact fingers provided in the present invention differs from Embodiment 1 in that it only includes a contact finger fixing tube, and the wires of the dynamic resistance measuring instrument are respectively connected to the contact finger fixing tube and the moving contact. The resistance measured by the dynamic resistance measuring instrument is the resistance of the contact finger fixing tube and the moving contact as a whole.

[0059] Embodiment 5 of the contact finger plugging and unplugging test device provided in the present invention is different from embodiment 1 in that, in this embodiment, the fixing structure is a bolt radially installed on the contact finger fixing tube, and the contact finger to be tested is fixed to the contact finger fixing tube by the bolt.

[0060] Example 6 of the contact finger insertion and extraction test device provided by the present invention differs from Example 1 in that a sliding rod, crank, and sliding seat are not provided in this embodiment. Instead, the pull rod and connecting rod remain hinged together. The drive mechanism includes an external gear fixed to a drive motor and a rotatably mounted sector gear. A fixed body is fixed to the central axis of the sector gear, and one end of the connecting rod is eccentrically hinged to the fixed body. A tension spring is also connected between the fixed body and the frame, with one end of the tension spring hinged between the central axis of the fixed body and the corresponding end of the connecting rod. During use, the drive motor drives the external gear to rotate, which in turn drives the sector gear, which in turn, via the connecting rod, drives the pull rod away from the contact finger fixing cylinder. During this process, the tension spring is continuously stretched, storing energy. When the tension spring is stretched to its maximum extension, the energy storage is complete, and the external gear and sector gear no longer engage. The tension spring elastically resets, driving the sector gear to rotate rapidly. The sector gear, via the connecting rod, drives the pull rod to move rapidly toward the contact finger fixing cylinder, allowing the moving contact to be quickly inserted into the contact finger to be tested.

[0061] The seventh embodiment of the insertion and extraction test device for the stylus provided in the present invention is different from the first embodiment in that, in the present embodiment, the hinge shaft and the hook rod are both fixed on the slide rod, that is, the hinge shaft and the hook rod cannot roll.

[0062] Embodiment 8 of the plug-in and pull-out test device for contacts provided in the present invention is different from Embodiment 1 in that no guide plate is provided in this embodiment, and the left side of the bottom of the slide groove has an inclined surface arranged symmetrically with the mating inclined surface, which constitutes a rack guide lifting inclined surface. The bottom of the left end of the slide rod has a sliding portion that slides with the rack guide lifting inclined surface. When the slide rod pulls the pull rod to move to the right, the sliding portion slides upward along the rack guide lifting inclined surface. During this process, the rack guide lifting inclined surface will lift the left end of the slide rod upward until the hook rod is disengaged from the hook.

[0063] Example 9 of the insertion and extraction test device for the contact finger provided in the present invention is different from Example 1 in that no crank is provided in this embodiment, and a circular drive disk is fixed on the output shaft of the drive motor. The connecting rod is eccentrically hinged to the drive disk, thereby realizing eccentric hinge between the connecting rod and the output shaft of the drive motor.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A contact finger plugging and unplugging test device, characterized in that: The invention comprises a frame, a moving contact (1), a finger fixing cylinder (2) fixed on the frame and a driving mechanism for driving the moving contact to move back and forth, wherein the finger fixing cylinder is provided with a fixing structure for installing the finger to be tested and has a through hole for the moving contact to pass through; the moving contact can be inserted into the finger fixing cylinder and squeeze the finger to be tested and be pulled out from the finger fixing cylinder; the driving mechanism comprises a connecting rod mechanism connected to the moving contact, a driving motor (15) connected to the connecting rod mechanism and a force spring (23) for applying force to the connecting rod mechanism when the moving contact is inserted into the finger fixing cylinder, the connecting rod mechanism comprises a pull rod (3) which is guided and assembled on the frame and connected to the moving contact and a connecting rod (17) which is eccentrically hinged on the output shaft of the driving motor, the force spring is sleeved on the pull rod, one end of the force spring presses on the pull rod and the other end presses on the frame, when the pull rod moves back to the finger fixing cylinder, the force spring is compressed to store energy, and when the force spring releases the stored energy, the force spring applies force to the pull rod. The elastic force is directed toward the finger fixing cylinder; the other end of the connecting rod is hinged with a slide rod (18), and the slide rod is assembled on the frame in a reciprocating manner in the direction toward and away from the finger fixing cylinder, and the driving motor can drive the slide rod to slide back and forth; the end of the pull rod facing away from the moving contact is provided with a hook (19) with an opening facing upward, and the corresponding end of the slide rod is provided with a hook rod (22), and the end of the hook facing the slide rod is provided with a hook guide lifting inclined surface, and when the driving motor drives the slide rod to slide toward the finger fixing cylinder, the hook guide lifting inclined surface lifts the hook rod upward so that the hook rod falls into the hook under its own weight, and when the driving motor drives the slide rod to slide away from the finger fixing cylinder, the pull rod is pulled to move to compress the force spring; the frame is provided with a frame guide lifting inclined surface, and the frame guide lifting inclined surface is used to lift the hook rod upward when the slide rod slides away from the finger fixing cylinder and the force spring is in place to lift the hook rod so that the hook rod is separated from the hook, so that the force spring energy is released.

2. The contact finger insertion and extraction test device according to claim 1, characterized in that: The two ends of the hook rod (22) protrude from the slide rod (18), and the frame is provided with a support surface for supporting the two ends of the hook rod (22). The frame guide lifting inclined surface is formed on the support surface. When the slide rod (18) slides back toward the finger fixing cylinder (2), the two ends of the hook rod (22) are lifted upward under the action of the frame guide lifting inclined surface to disengage the hook rod (22) from the hook (19).

3. The contact finger insertion and extraction test device according to claim 2, characterized in that: The frame is provided with vertically arranged baffles disposed at both ends of the hook rod (22), and the two ends of the hook rod (22) are engaged with the baffles on the corresponding side to constrain the reciprocating sliding of the slide rod (18).

4. The contact finger insertion and extraction test device according to claim 2 or 3, characterized in that: The hook rod (22) is rotatably mounted on the slide rod (18) around its own axis.

5. The contact finger insertion and extraction test device according to claim 1, 2 or 3, characterized in that: The frame includes vertical plates (11) disposed at both ends of a force spring (23), one end of the force spring (23) presses against a vertical plate (11) facing away from the finger fixing cylinder (2); a stop step (24) is fixedly provided on the pull rod (3), and the other end of the force spring (23) presses against the stop step (24); a buffer pad (26) is provided on one of the two vertical plates (11) close to the finger fixing cylinder (2), and the buffer pad (26) is used to cooperate with the stop step (24) for stopping.

6. The contact finger insertion and extraction test device according to claim 1, 2 or 3, characterized in that: The contact finger plugging and unplugging test device further comprises a strain gauge for being arranged on the contact finger to be tested and a monitoring device (29) connected to the strain gauge, wherein the monitoring device (29) is used to monitor the stress change of the contact finger to be tested during the plugging and unplugging process.

7. The contact finger insertion and extraction test device according to claim 1, 2 or 3, characterized in that: The plug-in and pull-out test device for the contact finger further comprises a conductive cylinder (9), wherein a conductive contact finger is provided in the conductive cylinder (9), and the movable contact (1) is installed in the conductive cylinder (9) and is connected to the conductive contact finger; the plug-in and pull-out test device for the contact finger further comprises a wire connected to the contact finger fixing cylinder (2) and the conductive cylinder (9), and a monitoring device (29) connected to the wire to monitor the resistance in the circuit.

8. The contact finger insertion and extraction test device according to claim 1, 2 or 3, characterized in that: The fixing structure is a shielding cover (7) that is buckled onto the contact finger fixing cylinder (2), and the shielding cover (7) is used to press the contact finger to be tested onto the contact finger fixing cylinder (2).

Images