Manual switching-on and switching-off protection mechanism, circuit breaker and switch equipment

Abstract

The utility model discloses a manual switching-on and switching-off protection mechanism, a circuit breaker and switch equipment, and relates to the field of circuit breakers, the manual switching-on and switching-off protection mechanism comprises a mounting plate and a microswitch trigger assembly, and the microswitch trigger assembly comprises a switching-off limiting crank arm and a movable telescopic crank arm. The opening limiting crank arm and the movable telescopic crank arm are rotationally mounted on the mounting plate, the opening limiting crank arm is hinged to the movable telescopic crank arm, and the limit contraction state of the movable telescopic crank arm corresponds to the middle section of the rotation stroke of the movable telescopic crank arm; the movable telescopic connecting lever is sleeved with a limiting compression spring and is provided with a first limiting structure and a second limiting structure. The opening limiting connecting lever is provided with an opening limiting clamping port, and the opening limiting clamping port is used for being clamped with the opening and closing connecting lever in an opening state; and one end, far away from the opening limiting crank arm, of the movable telescopic crank arm is used for shifting and triggering the remote control microswitch. According to the invention, the situation that remote false closing of the circuit breaker threatens on-site maintenance personnel can be prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of circuit breakers, in particular to a manual closing and opening protection mechanism, a circuit breaker and a switchgear. BACKGROUND

[0002] A circuit breaker refers to a switching device capable of closing, carrying and opening the current under normal circuit conditions and closing, carrying and opening the current under abnormal circuit conditions within a specified time. The opening and closing actions of the circuit breaker can be realized by manual operation and remote control. When the circuit breaker needs to be repaired due to a fault, the working personnel will switch the circuit breaker to an open state, but the remote closing operation of the circuit breaker will endanger the health and safety of the maintenance personnel. CONTENT OF THE UTILITY MODEL

[0003] In order to improve the problem that the remote closing operation of the circuit breaker endangers the health and safety of the on-site maintenance personnel, the present application provides a manual closing and opening protection mechanism, a circuit breaker and a switchgear.

[0004] The manual closing and opening protection mechanism, the circuit breaker and the switchgear provided by the present application adopt the following technical solutions:

[0005] A manual closing and opening protection mechanism comprises a mounting plate and a microswitch triggering assembly, the microswitch triggering assembly comprises an opening limiting crank and a movable telescopic crank, the opening limiting crank and the movable telescopic crank are respectively rotatably installed on the mounting plate through rotating shafts, the opening limiting crank and the movable telescopic crank are hingedly connected to each other, the hinge point between the opening limiting crank and the movable telescopic crank is located between the rotating shaft of the opening limiting crank and the rotating shaft of the movable telescopic crank, the telescopic part of the movable telescopic crank is located between the rotating shaft of the movable telescopic crank and the hinge point, the limit contraction state of the movable telescopic crank corresponds to the middle section of the rotation stroke of the movable telescopic crank; the movable telescopic crank is sleeved with a limiting compression spring, the movable telescopic crank is provided with a first limiting structure and a second limiting structure, the two ends of the limiting compression spring are respectively abutted against the first limiting structure and the second limiting structure; one end of the opening limiting crank away from the movable telescopic crank is provided with an opening limiting clamping port, the opening limiting clamping port is used for clamping with a closing and opening crank in an open state; one end of the movable telescopic crank away from the opening limiting crank is used for actuating a remote control microswitch.

[0006] By adopting the technical scheme, in the process that the closing and opening lever of the circuit breaker rotates to trigger the opening of the circuit breaker, the closing and opening lever of the circuit breaker is simultaneously clamped with the opening limiting clamping interface of the opening limiting lever, and drives the opening limiting lever to rotate around the rotation shaft thereof. In the process that the opening limiting lever rotates, the movable telescopic lever is simultaneously rotated and deformed. In the process that the movable telescopic lever rotates, the movable telescopic lever is first contracted and then stretched, so that the limiting compression spring experiences the process of being compressed and deformed and then relaxed and rebounded. Therefore, the limiting compression spring can hinder the closing and opening lever from rotating from the opening state to the closing state, so that the opening state of the closing and opening lever is kept stable. In the process that the movable telescopic lever rotates with the opening limiting lever, the movable telescopic lever simultaneously switches the trigger remote control micro switch from the open state to the disconnected state, so that the remote control circuit of the circuit breaker is disconnected, to ensure the safety of the on-site operation.

[0007] Optionally, the movable telescopic lever comprises a hinged arm and a switch plucking arm, the hinged point of the movable telescopic lever and the opening limiting clamping interface are arranged on the hinged arm, the rotation shaft of the movable telescopic lever is arranged on the switch plucking arm, and the movable telescopic lever triggers the micro switch through the switch plucking arm; the hinged arm and the switch plucking arm are arranged in mutual superposition, the hinged arm is provided with a first waist-shaped hole, the length direction of the first waist-shaped hole is consistent with the length direction of the hinged arm, one end of the rotation shaft of the movable telescopic lever penetrates out of the first waist-shaped hole and is threadedly connected with a limiting nut, and the rotation shaft of the movable telescopic lever is arranged in tangency in the first waist-shaped hole; the limiting compression spring is simultaneously sleeved on the hinged arm and the switch plucking arm, the first limiting structure is arranged on the hinged arm, and the second limiting structure is arranged on the switch plucking arm.

[0008] By adopting the technical scheme, the telescopic deformation of the movable telescopic lever is realized through the reciprocating sliding of the rotation shaft of the movable telescopic lever in the first waist-shaped hole, and the structure is relatively simple and easy to realize.

[0009] Optionally, the movable telescopic lever comprises a hinged arm and a switch plucking arm, the hinged point of the movable telescopic lever and the opening limiting clamping interface are arranged on the hinged arm, the rotation shaft of the movable telescopic lever is arranged on the switch plucking arm, and the movable telescopic lever triggers the micro switch through the switch plucking arm; the hinged arm is provided with a telescopic rod, the switch plucking arm is provided with a telescopic sleeve, and the hinged arm and the switch plucking arm are slidably inserted; the limiting compression spring is simultaneously sleeved on the switch plucking arm, the first limiting structure is arranged on the hinged arm, and the second limiting structure is arranged on the switch plucking arm.

[0010] By adopting the technical scheme, the telescopic deformation of the movable telescopic lever is realized through the reciprocating sliding of the rotation shaft of the movable telescopic lever in the first waist-shaped hole, and the structure is relatively simple and easy to realize.

[0011] Optionally, the closing and opening limiting assembly further comprises a limiting block and a sliding rod, the sliding rod is fixedly connected with the limiting block, the sliding rod is in sliding connection with the mounting plate, the limiting block is used for preventing the closing and opening lever from rotating from the opening state to the closing state, and the limiting block can slide to a position away from the closing and opening lever.

[0012] By adopting the above technical scheme, the limiting block can prevent the closing and opening lever from rotating from the opening state to the closing state, and when the limiting block slides to a position away from the closing and opening lever, the closing and opening lever can rotate from the opening state to the closing state. The safety of on-site maintenance can be further improved by arranging the closing and opening limiting assembly.

[0013] Optionally, the closing and opening limiting assembly further comprises a reset compression spring, a limiting piece and an adjusting piece, the reset compression spring is sleeved on the sliding rod, the limiting piece is connected with one end of the sliding rod away from the limiting block, the reset compression spring is located between the limiting piece and the mounting plate, the reset compression spring abuts against the limiting piece, the reset compression spring is in a pre-pressed state, and the minimum distance between the reset compression spring and the mounting plate is fixed. The adjusting piece is used for pushing the sliding rod to force the limiting block to slide to a position away from the closing and opening lever.

[0014] By adopting the above technical scheme, the reset compression spring can keep the limiting block stable in the state of preventing the closing and opening lever. The adjusting piece can push the sliding rod to overcome the elastic force of the reset compression spring, so as to drive the limiting block to be away from the closing and opening lever, thereby enabling the closing and opening lever to smoothly switch between the closing and opening states in the working state of the circuit breaker.

[0015] Optionally, a plurality of sliding rods are arranged, and the sliding rod is a round rod.

[0016] By adopting the above technical scheme, the round rod is used as the sliding rod, so that the sliding rod is easy to manufacture.

[0017] A circuit breaker comprises a manual closing and opening protection mechanism and a closing and opening lever, the mounting plate of the manual closing and opening protection mechanism is a structural plate of the circuit breaker, the closing and opening lever is rotationally connected with the mounting plate, the closing and opening lever is provided with a closing trigger protrusion and an opening trigger protrusion, the opening trigger protrusion is fixedly provided with an opening lever, and the opening lever is used for being clamped with the opening limiting block.

[0018] By adopting the above technical scheme, the closing and opening lever drives the opening limiting lever through the opening lever, so that the contact state between the closing and opening lever and the opening limiting lever is more reliable.

[0019] Optionally, the outer circumferential surface of the disconnecting lever has two opposite and concentric circular arc surfaces and two mutually parallel longitudinal cut surfaces.

[0020] By adopting the above technical scheme, the two longitudinal cut surfaces arranged on the outer circumferential surface of the disconnecting lever can reduce the friction between the disconnecting lever and the disconnecting limiting clamping interface and reduce the resistance when the closing and disconnecting crank arm drives the disconnecting limiting crank arm.

[0021] A switch device includes a mounting shell and the above-mentioned circuit breaker, and the circuit breaker is installed in the mounting shell.

[0022] In summary, the present application has at least one of the following beneficial technical effects:

[0023] In the process of rotating the closing and disconnecting crank arm of the circuit breaker to trigger the disconnecting of the circuit breaker, the closing and disconnecting crank arm of the circuit breaker is clamped with the disconnecting limiting clamping interface of the disconnecting limiting crank arm at the same time, and drives the disconnecting limiting crank arm to rotate around its own rotating shaft. The limiting compression spring can hinder the closing and disconnecting crank arm from rotating from the disconnecting state to the closing state. The movable telescopic crank arm will trigger the remote control micro switch to switch from the open state to the disconnected state, so as to ensure the safety of on-site operation.

[0024] The limiting block of the disconnecting limiting assembly can hinder the closing and disconnecting crank arm from rotating from the disconnecting state to the closing state. When the limiting block slides to a position deviated from the closing and disconnecting crank arm, the closing and disconnecting crank arm can rotate from the disconnecting state to the closing state. By arranging the closing and disconnecting limiting assembly, the safety of on-site maintenance can be further improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic view of the manual closing and disconnecting protection structure of embodiment 1.

[0026] Figure 2 is a schematic view of the triggered state of the manual closing and disconnecting protection structure of embodiment 1.

[0027] Figure 3 is a schematic view of the micro switch triggering assembly of embodiment 1.

[0028] Figure 4 is a schematic view of the closing and disconnecting limiting assembly of embodiment 1.

[0029] Figure 5 is a schematic view of the manual closing and disconnecting protection structure of embodiment 2.

[0030] Figure 6 is a schematic view of the disconnecting lever and the disconnecting limiting notch of embodiment 3.

[0031] BRIEF DESCRIPTION OF DRAWINGS

[0032] 10, manual closing and opening protection mechanism; 1, mounting plate; 2, micro switch trigger assembly; 21, opening limiting crank; 211, opening limiting clamping interface; 22, movable telescopic crank; 221, hinged arm; 2211, first waist-shaped hole; 222, switch pop-up arm; 2221, second waist-shaped hole; 223, micro switch lever; 23, hinged shaft; 231, limiting stepped surface; 232, limiting pin; 24, limiting compression spring; 25, first limiting structure; 26, second limiting structure; 27, nut; 28, telescopic rod; 29, telescopic sleeve; 3, closing and opening limiting assembly; 31, limiting block; 32, sliding rod; 33, reset compression spring; 34, limiting piece; 35, adjusting piece; 351, stud; 352, internally threaded seat; 20, closing and opening crank; 201, closing trigger protrusion; 202, opening trigger protrusion; 203, closing lever; 204, opening lever; 2041, arc surface; 2042, longitudinal cut surface; 30, closing rotation shaft; 301, closing receiving piece; 40, opening rotation shaft; 401, opening receiving piece; 50, mounting shell; 60, remote control micro switch. DETAILED DESCRIPTION

[0033] The following description will be made in conjunction with the accompanying drawings. Figures 1-6 The application is further described in detail. Embodiment 1

[0034] The embodiments of the application disclose a manual closing and opening protection mechanism, a circuit breaker and a switch device. Referring to Figure 1 and Figure 2 The manual closing and opening protection mechanism comprises a mounting plate 1, a micro switch trigger assembly 2 and a closing and opening limiting assembly 3, the micro switch trigger assembly 2 comprises an opening limiting crank 21 and a movable telescopic crank 22, the opening limiting crank 21 and the movable telescopic crank 22 are respectively rotatably installed on the mounting plate 1 through rotation shafts, the opening limiting crank 21 and the movable telescopic crank 22 are hinged to each other through a hinged shaft 23, the hinged point between the opening limiting crank 21 and the movable telescopic crank 22 is located between the rotation shaft of the opening limiting crank 21 and the rotation shaft of the movable telescopic crank 22, the telescopic position of the movable telescopic crank 22 is located between the rotation shaft of the movable telescopic crank 22 and the hinged point, and the limit contraction state of the movable telescopic crank 22 corresponds to the middle section of the rotation stroke of the movable telescopic crank 22.

[0035] Referring to Figure 1 and Figure 3The movable telescopic crank arm 22 is sleeved with a limiting compression spring 24. The movable telescopic crank arm 22 is provided with a first limiting structure 25 and a second limiting structure 26. The two ends of the limiting compression spring 24 abut against the first limiting structure 25 and the second limiting structure 26 respectively. The end of the split-gate limiting crank arm 21 away from the movable telescopic crank arm 22 is provided with a split-gate limiting clamping interface 211. The split-gate limiting clamping interface 211 is used for clamping the split-gate state of the split-gate crank arm 20. When the split-gate limiting clamping interface 211 clamps the split-gate crank arm 20, the split-gate limiting crank arm 21 and the movable telescopic crank arm 22 have an included angle therebetween. The end of the movable telescopic crank arm 22 away from the split-gate limiting crank arm 21 is provided with a micro-switch push rod 223, which is used for pushing and triggering the remote control micro-switch 60.

[0036] With reference to Figure 1 and Figure 2 The movable telescopic crank arm 22 comprises a hinged arm 221 and a switch push arm 222. Both the hinged arm 221 and the switch push arm 222 are metal plate structures. The hinged arm 221 and the switch push arm 222 are arranged in mutual superposition. The hinged point of the movable telescopic crank arm 22 and the split-gate limiting clamping interface 211 are arranged on the hinged arm 221. The rotation shaft of the movable telescopic crank arm 22 is located on the switch push arm 222. The movable telescopic crank arm 22 triggers the micro-switch through the switch push arm 222.

[0037] The hinged arm 221 is provided with a first waist-shaped hole 2211. The length direction of the first waist-shaped hole 2211 is consistent with the length direction of the hinged arm 221. One end of the rotation shaft of the movable telescopic crank arm 22 penetrates out of the first waist-shaped hole 2211 and is threadedly connected with a limiting nut 27. The rotation shaft of the movable telescopic crank arm 22 is inscribed in the first waist-shaped hole 2211. The switch push arm 222 is provided with a second waist-shaped hole 2221. The length direction of the second waist-shaped hole 2221 is consistent with the length direction of the first waist-shaped hole 2211. One end of a hinged shaft 23 is fixedly connected with the split-gate limiting crank arm 21. The other end of the hinged shaft 23 penetrates out of the second waist-shaped hole 2221 and is provided with a limiting pin hole 232. The hinged shaft 23 is inserted into the limiting pin hole 232 through a limiting pin 232. The hinged shaft 23 is provided with a limiting stepped surface 231. The limiting stepped surface 231 and the limiting pin 232 jointly limit the split-gate limiting crank arm 21.

[0038] The limiting compression spring 24 is sleeved on the hinged arm 221 and the switch push arm 222. The first limiting structure 25 is located on the hinged arm 221. The second limiting structure 26 is located on the switch push arm 222.

[0039] The working principle of the micro switch trigger assembly 2 is as follows: during the rotation of the closing and opening lever 20 of the circuit breaker to the position of triggering the opening of the circuit breaker, the closing and opening lever 20 of the circuit breaker is clamped with the opening limiting clamping interface 211 of the opening limiting lever 21, and the opening limiting lever 21 is rotated around its rotation shaft, during the rotation of the opening limiting lever 21, the movable telescopic lever 22 is rotated and deformed, during the rotation of the movable telescopic lever 22, the movable telescopic lever 22 is first contracted and then stretched, so that the limiting compression spring 24 experiences the processes of compression and relaxation, and the limiting compression spring 24 can prevent the closing and opening lever 20 from rotating from the opening state to the closing state, so that the opening state of the closing and opening lever 20 is stable. During the rotation of the movable telescopic lever 22 driven by the opening limiting lever 21, the remote control micro switch 60 is switched from the open state to the disconnected state, so that the remote control circuit of the circuit breaker is disconnected, to ensure the safety of the on-site operation. The remote control micro switch 60 can also disconnect the electromagnetic iron of the closing drive.

[0040] With reference to Figure 1 and Figure 4 The closing and opening limiting assembly 3 comprises a limiting block 31, a reset compression spring 33, a limiting piece 34, an adjusting piece 35 and three sliding rods 32, the sliding rod 32 is a round rod, the sliding rod 32 is fixedly connected with the limiting block 31, and the sliding rod 32 is slidably connected with the mounting plate 1. The limiting block 31 is used for preventing the closing and opening lever 20 from rotating from the opening state to the closing state, and the limiting block 31 can slide to a position deviated from the closing and opening lever 20. The limiting compression spring 24 can force the limiting block 31 to remain in the state of preventing the closing and opening lever 20.

[0041] The reset compression spring 33 is sleeved on one of the sliding rods 32, the limiting piece 34 is connected with one end of the sliding rod 32 away from the limiting block 31, the reset compression spring 33 is located between the limiting piece 34 and the mounting plate 1, the reset compression spring 33 abuts against the limiting piece 34, the other end of the reset compression spring 33 abuts against one structural plate of the circuit breaker, the reset compression spring 33 is in a pre-pressed state, and the minimum distance between the reset compression spring 33 and the mounting plate 1 is fixed.

[0042] The adjusting piece 35 is used for pushing the sliding rod 32 to force the limiting block 31 to slide to the position deviated from the closing and opening lever 20. In the embodiment, the adjusting piece 35 comprises a threaded stud 351 and an internally threaded seat 352, the threaded stud 351 is coaxially arranged on the sliding rod 32 where the reset compression spring 33 is located, the threaded stud 351 is threadedly connected with the internally threaded seat 352, the internally threaded seat 352 is fixedly installed on the outer housing of the circuit breaker, and during the telescopic movement of the threaded stud 351 relative to the internally threaded seat 352, the threaded stud 351 can push the sliding rod 32, so as to drive the limiting block 31.

[0043] The working principle of the closing and opening limiting assembly 3 is that the limiting block 31 can hinder the rotation switching of the closing and opening crank arm 20 from the opening state to the closing state, and when the limiting block 31 slides to a position deviated from the closing and opening crank arm 20, the closing and opening crank arm 20 can rotate from the opening state to the closing state. By setting the closing and opening limiting assembly 3, the safety of on-site maintenance can be further improved. The reset compression spring 33 can keep the limiting block 31 stable in the state of hindering the closing and opening crank arm 20. When the circuit breaker is in the working state, the adjusting piece 35 is used to move the limiting block 31 to the position deviated from the closing and opening crank arm 20, so that the closing and opening crank arm 20 of the circuit breaker can smoothly switch between the closing and opening states.

[0044] The embodiment also discloses a circuit breaker comprising the manual closing and opening protection mechanism, the closing and opening crank arm 20, the closing shaft 30 and the opening shaft 40. The mounting plate 1 of the manual closing and opening protection mechanism is a structural plate of the circuit breaker. The closing and opening crank arm 20 is rotationally connected with the mounting plate 1. The closing and opening crank arm 20 is provided with a closing trigger protrusion 201 and an opening trigger protrusion 202. The closing trigger protrusion 201 is fixedly provided with a closing lever 203. The opening trigger protrusion 202 is fixedly provided with an opening lever 204. The opening lever 204 is used for clamping with the opening limiting clamping interface 211. One end of the closing shaft 30 is fixedly provided with a closing receiving lever. The opening shaft 40 is fixedly provided with an opening receiving lever. The opening lever 204 can drive the opening receiving lever of the opening shaft 40. The closing lever 203 can drive the closing receiving lever of the closing shaft 30.

[0045] The embodiment also discloses a switch device, which refers to Figure 4 and comprises the mounting shell 50 and the circuit breaker. The circuit breaker is mounted in the mounting shell 50. The adjusting piece 35 of the closing and opening limiting assembly 3 is mounted on the side wall of the mounting shell 50. Embodiment 2

[0046] The difference between the embodiment and the embodiment 1 is that the structure of the movable telescopic crank arm 22 is different from that of the embodiment 1.

[0047] The embodiment refers to Figure 5 . In the embodiment, the movable telescopic crank arm 22 comprises a hinged arm 221 and a switch plucking arm 222. The hinged point and the opening limiting clamping interface 211 of the movable telescopic crank arm 22 are arranged on the hinged arm 221. The rotating shaft of the movable telescopic crank arm 22 is located on the switch plucking arm 222. The movable telescopic crank arm 22 triggers the microswitch through the switch plucking arm 222. The hinged arm 221 is provided with the telescopic rod 28. The switch plucking arm 222 is provided with the telescopic sleeve 29. The hinged arm 221 and the switch plucking arm 222 are slidably inserted. The limiting compression spring 24 is sleeved on the switch plucking arm 222. The first limiting structure 25 is located on the hinged arm 221. The second limiting structure 26 is located on the switch plucking arm 222. Embodiment 3

[0048] The difference between this embodiment and embodiment 1 is that the structure of the tripping lever 204 of the circuit breaker in this embodiment is different from that in embodiment 1.

[0049] With reference to Figure 6 In this embodiment, the outer circumferential surface of the tripping lever 204 has two opposite and concentric circular arc surfaces 2041 and two mutually parallel longitudinal cut surfaces 2042, i.e. the tripping lever 204 is formed by cutting two longitudinal surfaces with a round bar. The shape of the tripping limiting clamping interface 211 of the manual opening and closing protection mechanism is a waist-shaped hole as a whole, the width of the waist-shaped hole is greater than or equal to the diameter of the circular arc surface 2041, the opening width of the tripping limiting clamping interface 211 is greater than the distance between the two longitudinal cut surfaces 2042 of the tripping lever 204 and less than the diameter of the circular arc surface 2041 of the tripping lever 204.

[0050] In this embodiment, the tripping lever 204 is provided with two longitudinal cut surfaces 2042, which can reduce the friction when the tripping lever 204 rotates in the tripping limiting clamping interface 211. Moreover, after the tripping lever 204 with two longitudinal cut surfaces 2042 enters the tripping limiting clamping interface 211, the tripping lever 204 will rotate to a state where it cannot be pulled out of the tripping limiting clamping interface 211 with the rotation of the tripping limiting crank arm 21 and the opening and closing crank arm 20, so that the clamping state between the tripping lever 204 and the tripping limiting clamping interface 211 remains stable.

[0051] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A manual closing and opening protection mechanism, characterized by: The utility model relates to a microswitch trigger assembly and a microswitch trigger assembly, and the microswitch trigger assembly comprises a mounting plate (1) and a microswitch trigger assembly (2), the microswitch trigger assembly (2) includes a split limit crank (21) and a movable telescopic crank (22), the split limit crank (21) and the movable telescopic crank (22) are rotatably installed on the mounting plate (1) through pivot respectively, the split limit crank (21) and the movable telescopic crank (22) are hinged to each other, the hinge point between the split limit crank (21) and the movable telescopic crank (22) is located between the pivot of the split limit crank (21) and the pivot of the movable telescopic crank (22), the telescopic part of the movable telescopic crank (22) is located between the pivot and the hinge point of the movable telescopic crank (22), and the limit contraction state of the movable telescopic crank (22) corresponds to the middle section of the rotation stroke of the movable telescopic crank (22);The movable telescopic crank (22) is provided with a first limiting structure (25) and a second limiting structure (26), and the two ends of the limiting compression spring (24) abut against the first limiting structure (25) and the second limiting structure (26) respectively;The end, away from the movable telescopic crank (22), of the split limit crank (21) is provided with a split limit clamping interface (211), and the split limit clamping interface (211) is used for clamping with the split-close crank (20) in the split state;The end, away from the split limit crank (21), of the movable telescopic crank (22) is used for triggering the remote control microswitch (60).

2. A manual opening and closing protection mechanism according to claim 1, characterized in that: The movable telescopic crank (22) comprises a hinged arm (221) and a switch plucking arm (222), the hinge point of the movable telescopic crank (22) and the split limit clamping interface (211) are arranged on the hinged arm (221), the pivot of the movable telescopic crank (22) is located on the switch plucking arm (222), the movable telescopic crank (22) triggers the microswitch through the switch plucking arm (222), the hinged arm (221) and the switch plucking arm (222) are arranged in mutual superposition, the hinged arm (221) is provided with a first waist-shaped hole (2211), the length direction of the first waist-shaped hole (2211) is consistent with the length direction of the hinged arm (221), one end of the pivot of the movable telescopic crank (22) penetrates out of the first waist-shaped hole (2211) and is threadedly connected with a limiting nut (27), and the pivot of the movable telescopic crank (22) is inscribed in the first waist-shaped hole (2211), the limiting compression spring (24) is simultaneously arranged on the hinged arm (221) and the switch plucking arm (222), the first limiting structure (25) is located on the hinged arm (221), and the second limiting structure (26) is located on the switch plucking arm (222).

3. A manual opening and closing protection mechanism according to claim 1, characterized in that: The active telescopic crank arm (22) includes a hinged arm (221) and a switch pop arm (222), the hinge point of the active telescopic crank arm (22) and the split gate limiting clamping interface (211) are arranged on the hinged arm (221), the rotating shaft of the active telescopic crank arm (22) is located on the switch pop arm (222), and the active telescopic crank arm (22) triggers the micro switch through the switch pop arm (222); the hinged arm (221) is provided with a telescopic rod (28), the switch pop arm (222) is provided with a telescopic sleeve (29), and the hinged arm (221) and the switch pop arm (222) are slidingly inserted; the limiting compression spring (24) is sleeved on the switch pop arm (222) at the same time, the first limiting structure (25) is located on the hinged arm (221), and the second limiting structure (26) is located on the switch pop arm (222).

4. A manual opening and closing protection mechanism according to claim 1, characterized in that: Further comprising a closing and opening limiting assembly (3), the closing and opening limiting assembly (3) includes a limiting block (31) and a sliding rod (32), the sliding rod (32) is fixedly connected with the limiting block (31), the sliding rod (32) is slidingly connected with the mounting plate (1), and the limiting block (31) is used for preventing the closing and opening crank arm (20) from rotating from the opening state to the closing state; the limiting block (31) can slide to a position deviated from the closing and opening crank arm (20); and the limiting compression spring (24) can force the limiting block (31) to remain in a state of preventing the closing and opening crank arm (20).

5. A manual closing and opening protection mechanism according to claim 4, characterized in that: The closing and opening limiting assembly (3) further includes a reset compression spring (33), a limiting piece (34) and an adjusting piece (35), the reset compression spring (33) is compressedly sleeved on the sliding rod (32), the limiting piece (34) is connected with one end of the sliding rod (32) away from the limiting block (31), the reset compression spring (33) is located between the limiting piece (34) and the mounting plate (1), the reset compression spring (33) abuts against the limiting piece (34), the reset compression spring (33) is in a pre-pressing state, and the minimum distance between the reset compression spring (33) and the mounting plate (1) remains fixed; and the adjusting piece (35) is used for pushing the sliding rod (32) to force the limiting block (31) to slide to a position deviated from the closing and opening crank arm (20).

6. A manual opening and closing protection mechanism according to claim 4, characterized in that: A plurality of sliding rods (32) are arranged, and the sliding rod (32) is a round rod.

7. A circuit breaker characterized by: A manual closing and opening protection mechanism and a closing and opening crank arm (20) are included, the mounting plate (1) of the manual closing and opening protection mechanism is a structural plate of a circuit breaker, the closing and opening crank arm (20) is rotationally connected with the mounting plate (1), the closing and opening crank arm (20) is provided with a closing trigger protrusion (201) and an opening trigger protrusion (202), the opening trigger protrusion (202) is fixedly provided with an opening lever (204), and the opening lever (204) is used for clamping with the opening limiting clamping interface (211).

8. The circuit breaker of claim 7, wherein: The outer circumferential surface of the disconnecting lever (204) has two opposite and concentric circular arc surfaces (2041) and two mutually parallel longitudinal cut surfaces (2042).

9. A switching device, characterized by: The circuit breaker of claim 8 is installed in a mounting housing (50).

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