Opening and closing operation device for circuit breaker test and circuit breaker

Abstract

The utility model relates to the technical field of high-voltage switch operating devices, in particular to an opening and closing operating device for a circuit breaker test and a circuit breaker. The opening and closing operation device for the breaker test comprises a fixing seat with a center hole, the fixing seat is provided with a fixing structure used for being fixed with a crank arm box of a breaker, and the center hole of the fixing seat is movably provided with an operation rod. One end of the operating rod forms an input end used for applying force to the operating rod to drive the operating rod to move relative to the fixed seat, and the other end forms an output end used for penetrating into the connecting lever box to be connected with the transmission connecting lever to drive the transmission connecting lever to perform circuit breaker opening and closing actions when the operating rod moves relative to the fixed seat. The fixing seat is provided with a limiting structure for limiting when the operating rod moves to a set position so as to maintain the opening and closing state of the circuit breaker, and the opening and closing operating device for the circuit breaker test has the advantages of few parts, simple structure and low cost, and is favorable for reducing the test cost.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage switch operating devices, in particular to an opening and closing operating device for circuit breaker testing and a circuit breaker. Background Art

[0002] Circuit breakers with arc extinguishing capabilities have the characteristics of high breaking capacity, high insulation strength, and environmental friendliness, and are widely used across various voltage levels. The existing circuit breaker structure can be found in a circuit breaker disclosed in Chinese Utility Model Patent No. CN206893524U. The circuit breaker includes a single-phase pole and an operating mechanism. The single-phase pole includes a pole body, a crank arm box disposed at the lower end of the pole body, a transmission crank arm main shaft rotatably mounted on the crank arm box, and an inner crank arm and an outer crank arm mounted on the transmission crank arm main shaft. The inner crank arm is connected to an insulating pull rod, which is connected to a movable conductive rod of a moving contact assembly. The outer crank arm is connected to the operating mechanism so that the operating mechanism drives the outer crank arm to swing, which in turn drives the transmission crank arm main shaft to rotate, which in turn drives the inner crank arm to rotate, thereby driving the insulating pull rod to operate, thereby achieving the opening and closing of the moving contact. The outer crank arm constitutes a transmission crank arm that is connected to the external operating mechanism and transmits the torque of the operating mechanism. The opening and closing actions of the circuit breaker body are realized by the swing of the transmission crank arm.

[0003] To ensure the performance of circuit breakers, they are usually subject to corresponding tests, such as insulation tests, temperature rise tests, and aging tests. During the test, the circuit breaker needs to be opened and closed. To meet the test requirements, the circuit breaker needs to maintain accurate open and closed positions. Currently, a spring operating mechanism is installed on the circuit breaker to complete the opening and closing operations. However, the spring operating mechanism required for the circuit breaker test is complex and expensive, which increases the test cost and is inconvenient to maintain. Utility Model Content

[0004] The purpose of the present utility model is to provide an opening and closing operating device for circuit breaker testing, so as to solve the problem that the current circuit breaker test requires a matching spring operating mechanism to perform opening and closing operations, which makes the test cost high; the purpose of the present utility model is also to provide a circuit breaker to solve the above problem.

[0005] The technical solution of the circuit breaker test opening and closing operating device of the utility model is:

[0006] A circuit breaker testing opening and closing operating device comprises a fixing base with a center hole, the fixing base being provided with a fixing structure for fixing to a crank box of the circuit breaker, an operating rod being movably mounted in the center hole of the fixing base, one end of the operating rod constituting an input end for applying force to the operating rod to drive the operating rod to move relative to the fixing base, and the other end constituting an output end for penetrating into the crank box and connecting with a transmission crank arm to drive the transmission crank arm to perform circuit breaker opening and closing actions when the operating rod moves relative to the fixing base, and a limiting structure being provided on the fixing base for limiting the operating rod when it moves to a set position.

[0007] Furthermore, the operating rod includes a main rod body and a connecting piece that is relatively rotatably connected to one end of the main rod body. The other end of the main rod body constitutes the input end, and the output end is provided on the connecting piece. A threaded portion is provided in the center hole of the fixed seat. The main rod body is threadedly connected to the threaded portion so that the operating rod can move relative to the fixed seat when the main rod body is screwed. The threaded portion constitutes the limiting structure to limit the movement of the main rod body along its extension direction when the operating rod moves to the set position.

[0008] Furthermore, the connecting piece is provided with a rotating connecting cavity, and the main rod body has a stop portion rotatably arranged in the rotating connecting cavity. The rotating connecting cavity is provided with stop walls on both axial sides of the stop portion so that when the main rod body is screwed, the stop portion cooperates with the stop walls on both sides to push and pull the connecting piece.

[0009] Furthermore, the connecting piece includes a sleeve and a joint, the output end is arranged on the joint, one end of the sleeve is provided with an inner step, and the other end is threadedly connected to the joint, the joint and the sleeve form the rotating connection cavity, and the inner step and the opposite surface of the joint respectively constitute the stopping wall.

[0010] Furthermore, the fixing seat includes a cylinder and an inner ring platform arranged at the end of the cylinder, the inner diameter of the cylinder is larger than the outer diameter of the operating rod, the inner diameter of the inner ring platform is adapted to the outer diameter of the operating rod, and the limiting structure is arranged on the inner ring platform.

[0011] Furthermore, the fixing seat includes a disc body fixed to an end of the cylinder away from the inner ring platform, and the fixing structure is arranged on the disc body.

[0012] Furthermore, a hollow structure is provided on the cylinder.

[0013] Furthermore, the hollow structure includes at least two hollow holes spaced apart along the circumference of the cylinder.

[0014] Furthermore, the input end is equipped with a hand lever extending perpendicular to the operating lever.

[0015] The beneficial effects of the opening and closing operating device for circuit breaker testing of the present invention are as follows: the present invention pioneers a new opening and closing operating device for circuit breaker testing, wherein the opening and closing operating device is mounted on the crank arm box through a fixed seat, an operating rod is movably mounted in the center hole of the fixed seat, the output end of the operating rod penetrates into the crank arm box and is connected with the transmission crank arm, when the circuit breaker test is carried out, force is applied to the input end of the operating rod to make the operating rod move relative to the fixed seat, and then the operating rod is used to drive the transmission crank arm to move, thereby realizing the opening and closing action of the circuit breaker, when the operating rod moves to the set position, the circuit breaker is in the set opening state or closing state, at this time the operating rod is limited by the limiting structure, the relative position of the operating rod and the fixed seat is maintained, and the opening and closing state of the circuit breaker is maintained, such an opening and closing operating device for circuit breaker testing has few parts, a simple structure, and a low cost, which is conducive to reducing the test cost.

[0016] The technical solution of the circuit breaker of the present utility model is:

[0017] A circuit breaker comprises a crank arm box and a transmission crank arm. An opening and closing operating device for circuit breaker testing is installed on the outer wall of the crank arm box. The opening and closing operating device for circuit breaker testing comprises a fixing seat with a center hole. The fixing seat is provided with a fixing structure for fixing to the crank arm box of the circuit breaker. An operating rod is movably mounted in the center hole of the fixing seat. One end of the operating rod constitutes an input end for applying force to the operating rod to drive the operating rod to move relative to the fixing seat, and the other end constitutes an output end for penetrating into the crank arm box and connecting with the transmission crank arm to drive the transmission crank arm to perform circuit breaker opening and closing actions when the operating rod moves relative to the fixing seat. The fixing seat is provided with a limiting structure for limiting the operating rod when it moves to a set position.

[0018] Furthermore, the operating rod includes a main rod body and a connecting piece that is relatively rotatably connected to one end of the main rod body. The other end of the main rod body constitutes the input end, and the output end is provided on the connecting piece. A threaded portion is provided in the center hole of the fixed seat. The main rod body is threadedly connected to the threaded portion so that the operating rod can move relative to the fixed seat when the main rod body is screwed. The threaded portion constitutes the limiting structure to limit the movement of the main rod body along its extension direction when the operating rod moves to the set position.

[0019] Furthermore, the connecting piece is provided with a rotating connecting cavity, and the main rod body has a stop portion rotatably arranged in the rotating connecting cavity. The rotating connecting cavity is provided with stop walls on both axial sides of the stop portion so that when the main rod body is screwed, the stop portion cooperates with the stop walls on both sides to push and pull the connecting piece.

[0020] Furthermore, the connecting piece includes a sleeve and a joint, the output end is arranged on the joint, one end of the sleeve is provided with an inner step, and the other end is threadedly connected to the joint, the joint and the sleeve form the rotating connection cavity, and the inner step and the opposite surface of the joint respectively constitute the stopping wall.

[0021] Furthermore, the fixing seat includes a cylinder and an inner ring platform arranged at the end of the cylinder, the inner diameter of the cylinder is larger than the outer diameter of the operating rod, the inner diameter of the inner ring platform is adapted to the outer diameter of the operating rod, and the limiting structure is arranged on the inner ring platform.

[0022] Furthermore, the fixing seat includes a disc body fixed to an end of the cylinder away from the inner ring platform, and the fixing structure is arranged on the disc body.

[0023] Furthermore, a hollow structure is provided on the cylinder.

[0024] Furthermore, the hollow structure includes at least two hollow holes spaced apart along the circumference of the cylinder.

[0025] Furthermore, the input end is equipped with a hand lever extending perpendicular to the operating lever.

[0026] The beneficial effects of the circuit breaker of the present invention are as follows: the present invention pioneers a switching operation device for circuit breaker testing, wherein the switching operation device is mounted on the crank arm box through a fixed seat, an operating rod is movably mounted in the center hole of the fixed seat, the output end of the operating rod penetrates into the crank arm box and is connected with the transmission crank arm, when the circuit breaker test is carried out, force is applied to the input end of the operating rod to make the operating rod move relative to the fixed seat, and then the operating rod is used to drive the transmission crank arm to move, thereby realizing the switching operation of the circuit breaker, when the operating rod moves to the set position, the circuit breaker is in the set opening state or closing state, at this time the operating rod is limited by the limiting structure, the relative position of the operating rod and the fixed seat is maintained, and the switching state of the circuit breaker is maintained, such a switching operation device for circuit breaker testing has few parts, simple structure and low cost, which is conducive to reducing the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the connection between the opening and closing operating device for circuit breaker testing and the transmission crank arm when the circuit breaker is in the open state according to an embodiment of the circuit breaker of the present utility model;

[0028] Figure 2 This is a schematic diagram of the connection between the opening and closing operating device for circuit breaker testing and the transmission crank arm when the circuit breaker is in the closed state in an embodiment of the circuit breaker of the present utility model;

[0029] Figure 3 for Figure 2 Schematic diagram of the opening and closing operating device for circuit breaker testing;

[0030] Figure 4 for Figure 2 Schematic cross-sectional view of the opening and closing operating device for circuit breaker testing.

[0031] In the figure: 100, crank arm box; 101, fixed protrusion; 200, transmission crank arm; 1, fixed plate; 2, mounting tube; 3, main rod body; 4, hand lever; 5, sleeve; 6, joint. DETAILED DESCRIPTION

[0032] The opening and closing operating device for circuit breaker testing of the present invention is mounted on the crank arm box through a fixing seat, an operating rod is movably mounted in the center hole of the fixing seat, the output end of the operating rod penetrates into the crank arm box and is connected with the transmission crank arm, when the circuit breaker test is carried out, force is applied to the input end of the operating rod to make the operating rod move relative to the fixing seat, and then the operating rod is used to drive the transmission crank arm to move, thereby realizing the opening and closing actions of the circuit breaker, when the operating rod moves to a set position, the circuit breaker is in a set opening state or closing state, at this time the operating rod is limited by the limiting structure, the relative position of the operating rod and the fixing seat is maintained, and the opening and closing states of the circuit breaker are maintained, such an opening and closing operating device for circuit breaker testing has few parts, a simple structure, and a low cost, which is conducive to reducing the test cost.

[0033] Embodiments of the circuit breaker of the present utility model:

[0034] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown, the circuit breaker includes a crank box 100, and the pole body of the circuit breaker (not shown in the figure) is fixedly installed on the upper side of the crank box 100. The circuit breaker is a single-phase circuit breaker. The crank box 100 has a closed chamber and an outer chamber. A crank main shaft is rotatably installed on the crank box 100. The inner crank arm is installed on the part of the crank main shaft located in the closed chamber, and the outer crank arm is installed on the part located in the outer chamber. The inner crank arm is connected to the insulating pull rod in the pole body, and the outer crank arm constitutes a transmission crank arm 200 for connecting the operating mechanism. The operating mechanism in this embodiment is a circuit breaker test opening and closing operating device. The circuit breaker test opening and closing operating device is used to drive the transmission crank arm 200 to swing, and then drive the moving contact assembly in the pole body to perform opening and closing actions through the crank main shaft, the inner crank arm, and the insulating pull rod.

[0035] The circuit breaker testing opening and closing operating device is mounted on the horizontal outer wall of the crank arm box 100. It includes a fixed base and an operating lever. The fixed base includes a fixed plate 1 and a mounting tube 2. The operating lever includes a main rod body 3 and a connecting piece, which includes a sleeve 5 and a joint 6. One end of the mounting tube 2 is fixed to the fixed plate 1, which is fixed to the crank arm box 100. One end of the main rod body 3 extends from the end of the mounting tube 2 away from the fixed plate 1. The other end of the main rod body 3 is connected to the sleeve 5, which is connected to the joint 6. The joint 6 is hingedly connected to the transmission crank arm 200. Both the fixed disk 1 and the mounting tube 2 have a center hole and the center holes of the two are connected. The center hole of the fixed disk 1 and the center hole of the mounting tube 2 together constitute the center hole of the fixing seat. The operating rod is movably installed in the center hole of the fixing seat. The corresponding side walls of the crank arm box 100 are provided with avoidance through-holes corresponding to the center hole of the fixing seat for the operating rod to pass through. The two ends of the operating rod respectively constitute the input end and the output end. The output end is located at the joint 6, and the input end is located at the end of the main rod body 3 away from the joint 6. The input end is used to apply force to the operating rod to drive the operating rod to move relative to the fixing seat, and the output end is used to penetrate into the crank arm box 100 and connect with the transmission crank arm 200. When conducting a circuit breaker test, force is applied to the input end of the operating lever to move the operating lever relative to the fixed seat, and then the operating lever drives the transmission crank arm 200 to move, thereby realizing the circuit breaker opening and closing actions. When the operating lever moves to the set position, the circuit breaker is in the set opening state or closing state. The set position of the operating lever is also the position for realizing the opening and closing of the circuit breaker. A limiting structure is provided on the fixed seat to limit the operating lever when it moves to the set position. The limiting structure limits the operating lever to maintain the relative position of the operating lever and the fixed seat, thereby maintaining the opening and closing states of the circuit breaker. Such an opening and closing operating device for circuit breaker testing has a relatively simple structure, low cost, and is easy to operate, which is conducive to reducing test costs.

[0036] One end of the mounting tube 2 is fixedly connected to the fixed disk 1. A fixing protrusion 101 is provided on the side wall of the crank arm box 100 for mounting the fixed disk 1. The fixing protrusion 101 is provided with a mounting hole. The fixing disk 1 is provided with a fixing hole corresponding to the mounting hole on the fixing protrusion 101. The fixing holes on the fixing disk 1 constitute a fixing structure for fixing to the crank arm box 100 of the circuit breaker. The fixing holes on the fixing disk 1 and the mounting holes on the fixing protrusion 101 are utilized to fix the fixing disk 1 to the fixing protrusion 101 by bolts. The fixing protrusion 101 of the crank arm box 100 has a large thickness, which is conducive to the reliable fixation of the fixing seat of the opening and closing operating device for circuit breaker testing on the crank arm box 100.

[0037] A threaded hole is provided at one end of the mounting tube 2 away from the fixed plate 1, and the main rod body 3 of the operating rod is threadedly connected to the threaded hole of the mounting tube 2. The threaded hole is used to form a threaded portion in the center hole of the fixing seat. The extension direction of the main rod body 3 is consistent with the extension direction of the operating rod. The main rod body 3 is rotatably connected to the connecting piece. The main rod body 3 can rotate relative to the sleeve 5 and the joint 6 of the connecting piece. When the main rod body 3 is screwed, the threaded connection structure between the main rod body 3 and the mounting tube 2 allows the main rod body 3 to change its position relative to the mounting tube 2 in the extension direction of the main rod body 3, and drives the sleeve 5 and the joint 6 to move, so that the operating rod moves relative to the fixing seat and drives the transmission crank arm 200 to swing. When the operating rod moves to the set position, the main rod body 3 and the mounting tube 2 are used to rotate. The threaded connection maintains the relative position of the operating rod and the fixed seat. Thus, when no external force is applied, the operating rod will not move relative to the fixed seat due to the reaction force exerted by the transmission crank arm 200 on the operating rod along its extension direction. The threaded hole of the mounting barrel 2 constitutes a limiting structure to restrict the movement of the main rod body 3 along its extension direction. During circuit breaker testing, when the circuit breaker is in the open or closed state, the threaded connection between the main rod body 3 and the mounting barrel 2 can maintain the position of the transmission crank arm 200, thereby satisfying the need for axial limitation of the operating rod. By threading the main rod body 3 and the mounting barrel 2, the position of the operating rod can be steplessly adjusted by turning the main rod body 3 to accommodate different opening distances of the circuit breaker contacts, facilitating the satisfaction of different testing requirements.

[0038] One end of the sleeve 5 is connected to the main rod body 3, and the other end is threadedly connected to the joint 6. The end of the joint 6 away from the sleeve 5 is provided with a flat portion, and the flat portion is provided with a connection hole for connecting the transmission crank arm 200 through a connecting shaft. The end of the joint 6 is threadedly connected to the inner cavity of the sleeve 5, and the end of the sleeve 5 connected to the main rod body 3 is provided with an inner step. The inner steps of the joint 6 and the sleeve 5 are spaced apart along the axial direction of the sleeve 5 so that the joint 6 and the sleeve 5 form a rotating connection cavity. The end of the main rod body 3 for connecting with the connecting piece is provided with a stop portion. The outer diameter of the main body of the main rod body 3 is smaller than the outer diameter of the stop portion. The main body of the main rod body 3 passes through the sleeve 5, and the stop portion of the main rod body 3 is rotatably set in the rotating connection cavity. The inner step of the sleeve 5 has a The step surface on the side of the connector 6, the step surface of the inner step of the sleeve 5 is opposite to the end face of the connector 6 and respectively constitutes a stop wall. The two stop walls are respectively located on both sides of the axial direction of the stop portion of the main rod body 3. When the main rod body 3 is screwed, the main rod body 3 can be rotated relative to the connector by using the rotating connection cavity to avoid applying torque to the transmission crank arm 200. At the same time, the stop portion of the main rod body 3 cooperates with the stop walls on both sides to push and pull the connector, and then push and pull the transmission crank arm 200 to realize the opening and closing action of the circuit breaker. The sleeve 5 and connector 6 connected together by threads form a rotating connection cavity, which has a simple structure and is easy to manufacture. In order to prevent the threaded connection parts of the sleeve 5 and connector 6 from loosening, a limit pin can be additionally provided.

[0039] The mounting tube 2 includes a body and an inner ring platform disposed at the end of the body. The inner diameter of the body is larger than the outer diameter of the main rod body 3. The inner ring platform is located at the end of the body away from the fixed disk 1. The inner diameter of the inner ring platform matches the outer diameter of the main rod body 3. The center hole of the inner ring platform constitutes a threaded hole for threaded connection to the main rod body 3. The main rod body 3 is provided with a threaded section that is threadedly connected to the inner ring platform, and the length of the threaded section meets the position adjustment requirements of the operating rod. The center hole on the fixed disk 1 for the operating rod to pass through, the inner hole of the mounting tube 2, and the center hole of the inner ring platform on the mounting tube 2 together form the center hole of the fixing seat. The mounting tube 2 has a body with a larger inner diameter, which makes it easier to use the inner cavity of the body to avoid the connecting parts of the operating rod. The fixed disk 1 constitutes a disk body fixed to the end of the body away from the inner ring platform. The fixing structure is set on the disk body, and the larger area of the disk body is used to facilitate reliable fixation with the crank box 100. A hollow structure is provided on the body of the mounting tube 2, and the hollow structure includes a plurality of hollow holes spaced apart along the circumference of the body. The hollow holes are used to facilitate observation of the status of the operating rod in the mounting tube 2 and also to reduce weight. The hollow holes at different circumferential positions can be used for observation from different directions, which is convenient for use.

[0040] The input end of the main rod body 3 extends out of the mounting tube 2 , and a hand rod 4 extending perpendicular to the main rod body 3 is installed at the input end of the main rod body 3 , so that the hand rod 4 is used to easily screw the main rod body 3 and apply force.

[0041] The circuit breaker test opening and closing operating device can be used to control the contact opening distance in insulation test and burn-in test, and to control the contact pressure in temperature rise test. It is simple to assemble and easy to operate, thus improving work efficiency and reducing costs.

[0042] In other embodiments, the operating rod can be guided and moved on the fixed base, and the operating rod can be moved axially relative to the fixed base by pushing and pulling the operating rod. To limit the position of the operating rod, the fixed base is provided with a pin hole, and the operating rod is provided with a positioning hole. When the operating rod moves to the set position, the pin hole on the fixed base aligns with the corresponding positioning hole on the operating rod, and the operating rod is positioned by inserting a positioning pin. The positioning pin constitutes a limiting structure that limits the position of the operating rod when it moves to the set position. In this case, the operating rod and the fixed base are no longer provided with a threaded connection structure, and the operating rod is an integrally formed rod.

[0043] In other embodiments, the operating rod can also be guided and moved on the fixed seat, and the operating rod can be moved axially relative to the fixed seat by pushing and pulling the operating rod. In order to limit the operating rod, a jackscrew can be provided on the fixed seat. The jackscrew is used to tighten the operating rod. The jackscrew constitutes a limiting structure for limiting the position when the operating rod moves to the set position. At this time, the operating rod and the fixed seat are no longer provided with a threaded connection structure, and the operating rod is an integrally formed rod.

[0044] In other embodiments, the connecting member can also be a connecting sleeve, the outer wall of the connecting sleeve is provided with a connecting portion for connecting the transmission crank arm, one end of the main rod body is installed in the inner hole of the connecting sleeve through a bearing, and when the main rod body is screwed, the torque is transmitted through the bearing to drive the connecting sleeve to move.

[0045] In other embodiments, the connecting member is a connecting sleeve, and the outer wall of the connecting sleeve is provided with a connecting portion for connecting the transmission crank arm. The main body of the main rod body passes through the connecting sleeve, and the stop portion of the main rod body is located on one side of the connecting sleeve. A stop ring is provided on the main rod body on the other side of the connecting sleeve. The stop ring cooperates with the stop portion to limit the relative position of the connecting sleeve and the main rod body, and ensures that the main rod body can rotate relative to the connecting sleeve.

[0046] In other embodiments, the fixing seat can also be an integrated structure, and the fixing seat is a fixing sleeve, which is fixed to the outer wall of the crank box, and the inner hole of the fixing sleeve constitutes the center hole of the fixing seat for installing the operating rod.

[0047] In other embodiments, the center hole of the mounting tube can also be a hole of equal diameter, and the inner ring platform is no longer provided on the mounting tube. The center hole of the mounting tube is a threaded hole for threaded connection with the main rod body. In order to avoid the connecting part, the thickness of the fixing plate can be increased to use the center hole of the fixing plate to avoid the connecting part.

[0048] In other implementations, the mounting tube may not be provided with a hollow structure.

[0049] In other embodiments, the hollow hole may be provided at only one location.

[0050] In other embodiments, the input end of the operating rod may also be configured as a hexagonal head to facilitate cooperation with a wrench to screw the operating rod.

[0051] Embodiment of the circuit breaker test opening and closing operating device of the present utility model:

[0052] The opening and closing operating device for testing a circuit breaker in this embodiment is the same as the opening and closing operating device for testing a circuit breaker in the above-mentioned embodiment of the circuit breaker, and will not be described in detail here.

[0053] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A circuit breaker test opening and closing operating device, characterized in that: The utility model comprises a fixing base with a center hole, the fixing base is provided with a fixing structure for fixing to the crank box of the circuit breaker, an operating rod is movably installed in the center hole of the fixing base, one end of the operating rod constitutes an input end for applying force to the operating rod to drive the operating rod to move relative to the fixing base, and the other end constitutes an output end for penetrating into the crank box and connecting with the transmission crank arm to drive the transmission crank arm to perform the circuit breaker opening and closing action when the operating rod moves relative to the fixing base, and the fixing base is provided with a limiting structure for limiting the operating rod when it moves to a set position.

2. The circuit breaker test opening and closing operating device according to claim 1, characterized in that: The operating rod includes a main rod body and a connecting piece that is relatively rotatably connected to one end of the main rod body. The other end of the main rod body constitutes the input end, and the output end is provided on the connecting piece. A threaded portion is provided in the center hole of the fixed seat. The main rod body is threadedly connected to the threaded portion so that the operating rod can move relative to the fixed seat when the main rod body is screwed. The threaded portion constitutes the limiting structure to limit the movement of the main rod body along its extension direction when the operating rod moves to the set position.

3. The circuit breaker test opening and closing operating device according to claim 2, characterized in that: The connecting piece is provided with a rotating connecting cavity, and the main rod body has a stop portion rotatably arranged in the rotating connecting cavity. The rotating connecting cavity is provided with stop walls on both axial sides of the stop portion so that when the main rod body is screwed, the stop portion cooperates with the stop walls on both sides to push and pull the connecting piece.

4. The circuit breaker test opening and closing operating device according to claim 3, characterized in that: The connecting piece includes a sleeve and a joint. The output end is arranged on the joint. One end of the sleeve is provided with an inner step and the other end is threadedly connected to the joint. The joint and the sleeve form the rotating connection cavity. The inner step and the opposite surface of the joint respectively constitute the stopping wall.

5. The circuit breaker test opening and closing operating device according to any one of claims 1 to 4, characterized in that: The fixing seat includes a cylinder and an inner ring platform arranged at the end of the cylinder. The inner diameter of the cylinder is larger than the outer diameter of the operating rod. The inner diameter of the inner ring platform is adapted to the outer diameter of the operating rod. The limiting structure is arranged on the inner ring platform.

6. The circuit breaker test opening and closing operating device according to claim 5, characterized in that: The fixing seat comprises a disc body fixed on one end of the cylinder away from the inner ring platform, and the fixing structure is arranged on the disc body.

7. The circuit breaker test opening and closing operating device according to claim 5, characterized in that: The cylinder body is provided with a hollow structure.

8. The circuit breaker test opening and closing operating device according to claim 7, characterized in that: The hollow structure includes at least two hollow holes spaced apart along the circumference of the cylinder.

9. The circuit breaker test opening and closing operating device according to any one of claims 1 to 4, characterized in that: The input end is equipped with a hand lever extending perpendicular to the operating lever.

10. A circuit breaker comprising a crank box and a transmission crank, characterized in that: The outer wall of the crank box is installed with an opening and closing operating device for circuit breaker testing, and the opening and closing operating device for circuit breaker testing is the opening and closing operating device for circuit breaker testing according to any one of claims 1 to 9.

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