Manual operating mechanism for an electrical switch

Abstract

The present invention relates to a manual operating mechanism for an electrical switch, comprising a bracket and an operating shaft, wherein the front end of the operating shaft has a front barrel section for inserting an operating handle, a main limiting structure is arranged between the operating shaft and the bracket, the main limiting structure comprises a main limiting through hole arranged on the barrel wall of the front barrel section and a main limiting pin movably mounted on the bracket, the main limiting pin has a plug-in portion for plugging with the main limiting through hole, the main limiting pin has a main locking position in its movable stroke for making the plug-in portion enter the main limiting through hole, the main limiting pin also has a pushing portion for pushing the operating handle inserted in the front barrel section outward so that the plug-in portion is released from the main limiting through hole, and a avoiding structure for avoiding the pushing portion when the operating shaft rotates is arranged on the barrel wall of the front barrel section. When the operating handle is inserted into the front barrel section, the main limiting structure can be unlocked by using the operating handle, and no unlocking structure is required to be arranged separately, so that unlocking is convenient and operation is simpler.

Description

Technical Field

[0001] The invention relates to the field of power distribution equipment in the field of electrical equipment manufacturing, and in particular to a manual operating mechanism for an electrical switch. Background Art

[0002] With the rapid development of medium voltage primary equipment manufacturing technology, the design and manufacturing level of operating mechanisms used in various medium voltage equipment is also improving. However, the existing switch cabinet operating mechanism components are cumbersome and complex in structure, relatively expensive, and difficult to guarantee reliability. On electrical switches such as circuit breakers and earthing switches, corresponding manual operating mechanisms are often configured. When operating, the operating handle is connected to the corresponding operating shaft to drive the operating handle to rotate, and the operating mechanism of the electrical switch is driven by the corresponding operating shaft to perform the corresponding opening and closing operations.

[0003] Normally, a corresponding guide mechanism is usually provided to limit the rotation of the operating shaft to avoid misoperation or over-operation. For example, the isolating switch positioning operating device disclosed in the Chinese utility model patent with the authorization announcement number CN202712022U includes a rotating shaft, one end of which is provided with a corresponding keyway to facilitate the output of the rotation driving force, and the operating device also includes a handle for drivingly connecting with the rotating shaft to drive the rotating shaft to rotate. The above-mentioned rotating shaft is rotatably assembled on the corresponding bracket through the corresponding sleeve, and a guide plate is fixed on the rotating shaft, and two stop pins are arranged at intervals along the circumferential direction of the rotating shaft on the guide plate. The two stop pins are used to cooperate with the two guide blocks correspondingly provided on the bracket to achieve the guidance of the rotating stroke of the rotating shaft. In addition, the guide plate is provided with three positioning holes spaced along the circumferential direction of the rotating shaft, a corresponding latch is provided on the bracket, a tensioning spring is provided on the latch, and a handle is also provided on the latch. When the rotating shaft rotates to the corresponding position with the guide plate, the latch is installed in the corresponding positioning hole to realize the positioning of the rotating shaft. When the rotating shaft needs to be driven to rotate, the latch is first pulled out of the positioning hole, and then the rotating shaft is driven to rotate by the handle to realize the corresponding driving operation. When the rotating shaft rotates to the corresponding position with the guide plate, the latch is plugged into the corresponding guide hole on the guide plate to realize the rotation guide of the rotating shaft. The overall structure of the above positioning operation device is relatively complex, and a special guide plate needs to be designed. In addition, when operating, it is necessary to pull the latch to unlock it, which is inconvenient to operate. Summary of the invention

[0004] The object of the present invention is to provide a manual operating mechanism for an electrical switch which has a compact structure and is easy to operate.

[0005] To achieve the above-mentioned purpose, the technical solution of the manual operating mechanism for an electrical switch provided by the present invention is: a manual operating mechanism for an electrical switch, comprising a bracket and an operating shaft extending axially in the front-to-back direction and cooperating with the bracket for rotation, the front end of the operating shaft having a front cylinder section for inserting an operating handle to drive the operating shaft to rotate, a main limiting structure for limiting the rotation of the operating shaft is provided between the operating shaft and the bracket, the main limiting structure comprising a main limiting through hole provided on the cylinder wall of the front cylinder section and a main limiting pin movably assembled on the bracket, the main limiting pin having a plug-in portion for plugging with the main limiting through hole, the main limiting pin having a main locking position in its active stroke so that the plug-in portion enters the main limiting through hole, the main limiting pin also having a pushing portion for the operating handle inserted in the front cylinder section to push outward so that the plug-in portion is released from the main limiting through hole and unlocked, and a avoidance structure for avoiding the pushing portion when the operating shaft rotates is provided on the cylinder wall of the front cylinder section.

[0006] An auxiliary limiting structure for limiting the rotation of the operating shaft is also provided between the operating shaft and the bracket, the auxiliary limiting structure includes a corresponding auxiliary limiting hole and an auxiliary limiting pin, the auxiliary limiting hole is fixedly provided on one of the bracket and the operating shaft, and the auxiliary limiting pin is movably assembled on the other, the auxiliary limiting pin has an auxiliary locking position in its movable stroke for being plugged into the auxiliary limiting hole when the operating shaft is rotated to a position corresponding to the auxiliary limiting pin and the auxiliary limiting hole, the auxiliary limiting pin is provided with a self-unlocking structure for actively applying force by the operating shaft to push the auxiliary limiting pin out of the auxiliary limiting hole and unlock it when the main limiting pin is unlocked to allow the operating shaft to rotate.

[0007] The self-unlocking structure includes a push-unlocking inclined surface provided on the auxiliary limiting pin for push-matching with the auxiliary limiting hole, or includes an unlocking portion for push-matching with the push-unlocking inclined surface provided on the auxiliary limiting hole.

[0008] The auxiliary limiting hole is fixed on the operating shaft, the auxiliary limiting pin is elastically and telescopically assembled on the bracket, and the auxiliary limiting pin is connected with an auxiliary limiting pin elastic member forcing the auxiliary limiting pin to move toward the operating shaft.

[0009] The bracket is provided with a main limit pin elastic member for applying force to the main limit pin to force it to move to the main locking position.

[0010] The main limiting through hole is a long hole structure extending axially along the operating shaft, and the plug-in portion is a transverse extension portion used to fit and mate with the long hole structure.

[0011] There are at least two main limiting through holes in the main limiting structure arranged at intervals along the circumference of the operating shaft, and the number of auxiliary limiting holes or auxiliary limiting pins in the auxiliary limiting structure is the same as the number of the main limiting through holes and are arranged at intervals along the circumference of the operating shaft.

[0012] The avoidance structure is a guide groove located between any two adjacent main limit through holes, extending along the circumferential direction of the operating shaft and connecting the corresponding two main limit through holes. When the operating shaft rotates, the pushing portion rotates in cooperation with the guide groove to guide the rotation of the operating shaft.

[0013] The guide portion of the main limiting pin is located on a side of the plug-in portion facing the operating shaft in the axial direction of the main limiting pin.

[0014] The bracket includes a front clamping plate, a rear clamping plate, a positioning plate and a limit fixing plate fixed between the two clamping plates. In the radial direction of the operating shaft, the limit fixing plate is located on the side of the positioning plate facing the operating shaft, and the main limit pin is movably assembled on the positioning plate and the limit fixing plate along the radial direction of the operating shaft.

[0015] The beneficial effects of the present invention are as follows: in the manual operating mechanism for the electrical switch provided by the present invention, the operating shaft and the bracket are rotatably matched, the front barrel section of the operating shaft is for the operating handle to be inserted to drive the operating shaft to rotate, a main limiting structure is provided between the operating shaft and the bracket to limit the rotation of the operating shaft, the main limiting structure includes a main limiting through hole provided on the barrel wall of the front barrel section and a main limiting pin movably assembled on the bracket, the plug-in portion of the main limiting pin is plug-in matched with the main limiting through hole to limit the rotation of the operating shaft, when it is necessary to drive the operating shaft to rotate, the driving handle is inserted into the front barrel section, and the operating handle is used to cooperate with the pushing portion of the main limiting pin to disengage the plug-in portion of the main limiting pin from the main limiting through hole to unlock it, that is, when the operating handle is inserted into the front barrel section, the operating handle can be used to unlock the main limiting structure, and there is no need to set up an unlocking structure separately, the unlocking is convenient, and the operation is simpler.

[0016] Furthermore, an auxiliary limiting structure is provided between the operating shaft and the bracket, and the auxiliary limiting structure includes an auxiliary limiting pin and an auxiliary limiting hole. When the operating shaft is rotated into place, the auxiliary limiting pin is plugged into and matched with the auxiliary limiting hole to realize auxiliary locking of the operating shaft. When the main limiting structure is unlocked, a force can be applied through the operating shaft to push the auxiliary limiting pin out of the auxiliary limiting hole through the self-unlocking structure to realize automatic unlocking, and unlocking is also relatively convenient. Adding an auxiliary limiting structure can cooperate with the main limiting structure to improve the limiting effect of the operating shaft. When the operating shaft is rotated into place, the auxiliary limiting structure works to realize the rotation limit of the operating shaft, and then the operating handle is removed from the front cylinder section to effectively avoid over-rotation.

[0017] Furthermore, the self-unlocking structure includes a push-unlocking inclined surface on the auxiliary limit pin that cooperates with the auxiliary limit hole to push the auxiliary limit pin out of the auxiliary limit hole by using the push-unlocking inclined surface when the operating shaft rotates.

[0018] Furthermore, the auxiliary limiting hole is fixed on the operating shaft, the auxiliary limiting pin is elastically and telescopically assembled on the bracket, and the auxiliary limiting pin elastic member is used to apply elastic force to the auxiliary limiting pin. When the operating shaft is rotated into place, the auxiliary limiting pin and the auxiliary limiting hole are effectively plugged and locked. The self-unlocking structure can push the auxiliary limiting pin out of the auxiliary limiting hole when overcoming the force of the elastic member to achieve automatic unlocking, that is, when the automatic unlocking can be conveniently performed, the effective locking of the operating shaft is guaranteed.

[0019] Furthermore, a main limit pin elastic member is provided on the bracket, which applies an elastic force to the main limit pin to force it to move to the main locking position. When the operating shaft rotates to the position where the plug-in portion of the main limit pin corresponds to the main limit through hole and the operating handle exits the front cylinder section, the plug-in portion of the main limit pin is ensured to be plugged into the main limit through hole, thereby ensuring effective locking of the rotation of the operating shaft.

[0020] Furthermore, the main limit through hole is a long hole structure extending axially along the operating shaft, and the plug-in portion is a transverse extension portion that is plugged into and matched with the long hole structure. When the plug-in portion is plugged into the main limit through hole, it can not only prevent the circumferential rotation of the operating shaft, but also prevent the operating shaft from moving in the axial direction.

[0021] Furthermore, two main limit through holes in the main limit structure are arranged at intervals along the circumference of the operating shaft to correspond to the open position and the closed position of the operating shaft of the electrical switch.

[0022] Furthermore, the avoidance structure on the front cylinder section corresponding to the pushing portion of the main limit pin is a guide groove extending along the circumference of the operating shaft to guide the circumferential rotation of the operating shaft and improve the rotation stability of the operating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of an embodiment of a manual operating mechanism for an electrical switch provided by the present invention;

[0024] Figure 2 for Figure 1 The right side schematic diagram of the manual operating mechanism shown;

[0025] Figure 3 for Figure 1 Schematic diagram of the structure of the middle main limit pin. DETAILED DESCRIPTION

[0026] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0027] The specific embodiment of the manual operating mechanism for an electrical switch provided by the present invention is as follows: Figures 1 to 3As shown, the manual operating mechanism in this embodiment includes a bracket, on which an operating shaft 1 is rotatably mounted. The axial direction of the operating shaft 1 extends in the front-to-back direction, and an output limit groove 10 is provided at the rear end of the operating shaft 1 for closely matching with the main shaft of the knife switch in the electrical switch, so as to drive the knife switch to rotate when the operating shaft is rotated to perform corresponding opening and closing operations.

[0028] In fact, the front end of the operating shaft 1 has a front barrel section 11 for inserting a corresponding operating handle to drive the operating shaft to rotate. An expansion pin is installed in the front barrel section 11 to assemble the operating handle (not shown in the figure) inserted into the front barrel section 11 with the operating shaft 1 in a circumferentially fixed manner to ensure that the operating handle can drive the operating shaft to rotate.

[0029] In addition, a corresponding opening and closing indicator plate 2 is provided at the front end surface of the operating shaft 1. The opening and closing indicator plate 2 is provided with a through hole for the operating handle to pass through. When the operating handle drives the operating shaft to rotate, the opening and closing indicator plate 2 rotates accordingly to display the corresponding opening and closing states.

[0030] A main limiting structure and an auxiliary limiting structure for limiting the rotation of the operating shaft are provided between the operating shaft 1 and the bracket. The effective limiting locking of the operating shaft is achieved through the cooperation of the main limiting structure and the auxiliary limiting structure.

[0031] In this embodiment, the main limit structure specifically includes two main limit through holes 8 provided on the cylinder wall of the front cylinder section 11. The two main limit through holes 8 are spaced apart along the circumference of the operating shaft to correspond to the closing position and the opening position. In fact, the two main limit through holes 8 here are long hole structures extending along the axial direction of the operating shaft. Correspondingly, a corresponding main limit pin 5 is movably assembled on the bracket. The main limit pin 5 has a plug-in portion for plugging and matching with the main limit through hole. Corresponding to the long hole structure, the plug-in portion is specifically a transverse extension portion that matches and plugs with the long hole structure. In this way, when the plug-in portion is plugged with the main limit through hole 8, not only the circumferential rotation of the operating shaft can be limited, but also the axial movement of the operating shaft can be limited, thereby improving the stability of the operating shaft.

[0032] When the operating shaft 1 rotates to the position where the main limit pin 5 corresponds to the main limit through hole 8, the main limit pin 5 has a main locking position in its movable stroke so that the plug-in portion enters the main limit through hole 8, and the bracket is provided with a main limit pin elastic member 9 for applying force to the main limit pin to force it to move to the main locking position. In other words, when the operating shaft rotates to the closing position and the opening position, the main limit pin 5 corresponds to the corresponding main limit through hole 8, and under the action of the main limit pin elastic member 9, the plug-in portion of the main limit pin 5 enters the main limit through hole 8, realizing the locking limit of the rotation of the operating shaft.

[0033] When it is necessary to perform a reverse opening operation from the closing position or a reverse closing operation from the opening position, insert the operating handle into the front cylinder section 11, and the operating handle and the pushing portion provided on the main limit pin 5 push and cooperate to push the main limit pin outward, so that the plug-in portion of the main limit pin 5 is disengaged from the corresponding main limit through hole 8 and unlocked, which facilitates the operating handle to drive the operating shaft to rotate. For the main limit pin 5, the pushing portion is located on the side of the plug-in portion facing the operating shaft in the axial direction of the main limit pin 5, which facilitates the push unlocking. In this unlocking operation mode, the inserted operating handle is used to achieve quick unlocking, and there is no need to set up an unlocking structure separately, so that the structure of the corresponding limit part of the operating mechanism is simple and the unlocking operation is convenient.

[0034] Moreover, since the unlocking operation is realized by pushing the pushing portion of the main stop pin 5 against the operating shaft 1, in order to ensure the normal rotation of the operating shaft 1, a avoidance structure for avoiding the pushing portion when the operating shaft rotates is provided on the front barrel section 11 of the operating shaft 1. In fact, the avoidance structure here is specifically a guide groove extending along the circumference of the operating shaft and connecting the corresponding two main stop through holes. When the operating shaft rotates, the pushing portion of the main stop pin 5 cooperates with the guide groove to guide the rotation of the operating shaft. In this embodiment, the two main stop through holes as long hole structures and the guide groove form an "I"-shaped structure, and correspondingly, the plug-in portion as the lateral extension portion forms a "X"-shaped structure on the main stop pin 5.

[0035] In this embodiment, not only the main limiting structure is used to limit the rotation of the operating shaft 1, but also a corresponding auxiliary limiting structure is configured. The auxiliary limiting structure specifically includes an auxiliary limiting hole 7 and an auxiliary limiting pin 6 that are used in conjunction with each other. The auxiliary limiting hole 7 here is set on the operating shaft. The auxiliary limiting hole 7 is a circular hole, and two corresponding to the closing position and the closing position are set. The two auxiliary limiting holes 7 are on the same circumference, and the circumferential span and the rotation angle of the isolation knife switch are consistent. The auxiliary limiting pin 6 is elastically and telescopically assembled on the bracket. In fact, a mounting cylinder (not shown in the figure) is provided on the bracket. The auxiliary limiting pin 6 is an elastic and telescopic body that is elastically and telescopically assembled in the mounting cylinder. The auxiliary limiting pin 6 is connected to an auxiliary limiting pin elastic member (not shown in the figure) that applies force to the auxiliary limiting pin to move toward the operating shaft. In this way, under the action of the auxiliary limit pin elastic member, when the operating shaft 1 rotates to the position where the auxiliary limit pin 6 corresponds to the corresponding auxiliary limit hole 7, the auxiliary limit pin 6 has an auxiliary locking position in its active stroke that is plugged into and matched with the corresponding auxiliary limit hole 7. Moreover, the auxiliary limit pin 6 is also provided with a self-unlocking structure for pushing the auxiliary limit pin out of the auxiliary limit hole and unlocking it when the main limit pin 5 is unlocked and the operating shaft is rotated. The self-unlocking structure here is specifically a push-unlocking inclined surface provided on the auxiliary limit pin for pushing and matching with the corresponding auxiliary limit hole.

[0036] In addition, the bracket in this embodiment specifically includes a front clamping plate and a rear clamping plate for fixing on the switch cabinet body, and the operating shaft specifically cooperates with the front and rear clamping plates in rotation, and the above-mentioned switch opening and closing indicator plate 2 is located in front of the front clamping plate. Moreover, a positioning plate 3 and a guide fixing plate 4 are fixed between the two clamping plates. In the radial direction of the operating shaft, the guide fixing plate 4 is located on the side of the positioning plate 3 facing the operating shaft 1, and the installation tube for installing the auxiliary limit pin 6 is fixed on the guide fixing plate 4, and the main limit pin 5 is movably assembled on the positioning plate 3 and the guide fixing plate 4 along the radial direction of the operating shaft 1. In this embodiment, the positioning plate 3 is actually connected to the front clamping plate in an integrated bending transition.

[0037] During use, when the operating handle is not normally inserted, the main limit pin 5 and the auxiliary limit pin 6 are both in the corresponding locking position, that is, the plug-in portion of the main limit pin 5 is plugged and matched with the corresponding main limit through hole 8, and the auxiliary limit pin 6 is plugged and matched with the corresponding auxiliary limit hole 7. When a rotation operation is required, the operating handle is inserted, and the operating handle pushes and matches with the push portion on the main limit pin 5, and the main limit pin 5 is pushed outward, and the plug-in portion of the main limit pin 5 is disengaged from the corresponding main limit through hole 8, and then the operating handle is used to drive the operating shaft 1 to rotate to perform the corresponding opening and closing operations. At this time, the unlocking push-up inclined surface on the auxiliary limit pin 6 as a self-unlocking structure is used to push and lift the auxiliary limit pin 6 through the auxiliary limit hole 7 to achieve forced self-unlocking and ensure the normal rotation of the operating shaft.

[0038] When rotated into place, the auxiliary limit pin 6 corresponds to an auxiliary limit hole in another corresponding position. Under the action of the auxiliary limit pin elastic part, the auxiliary limit pin 6 is plugged into the auxiliary limit hole to play an auxiliary limit role. In fact, after the auxiliary limit pin 6 is plugged into the corresponding auxiliary limit hole, the operator will feel a sudden increase in resistance. Moreover, when the auxiliary limit pin falls into the auxiliary limit hole, there is a sound, which can effectively remind the operator to rotate into place and effectively avoid over-rotation.

[0039] After the operating shaft 1 is rotated into position, the operating handle is pulled out from the front cylinder section 11 , and under the action of the main limit pin elastic member, the main limit pin 5 falls into the corresponding main limit through hole 8 , forming a rotation limit for the operating shaft 1 .

[0040] The manual operating mechanism provided in this embodiment is not only provided with a main limit structure that can rely on the operating handle to achieve unlocking, but also has a corresponding auxiliary limit structure that can rely on the operating shaft to achieve self-unlocking, thereby improving the operating mechanism. The entire manual operating mechanism is more concise, the operating speed is fast, and the stability is good.

[0041] In this embodiment, not only a main limit structure but also an auxiliary limit structure is provided. In other embodiments, the auxiliary limit structure can be omitted and only the main limit structure is provided, and the main limit structure is automatically unlocked by an operating handle, and the unlocking operation is convenient.

[0042] In this embodiment, the auxiliary limiting pin is arranged on the bracket, and the auxiliary limiting hole is arranged on the operating shaft. In other embodiments, the auxiliary limiting pin may be arranged on the operating shaft, and the auxiliary limiting hole may be arranged on the bracket. Of course, in this embodiment, two auxiliary limiting holes and one auxiliary limiting pin are arranged. In other embodiments, two auxiliary limiting pins may be arranged, and only one auxiliary limiting hole may be arranged.

[0043] In this embodiment, the self-unlocking structure on the auxiliary limit pin is a push-unlocking inclined surface on the auxiliary limit pin, and the push-unlocking inclined surface can be a circular arc surface or an inclined plane. Of course, at this time, a corresponding inclined surface can also be provided on the auxiliary limit hole to facilitate the mandatory self-unlocking. In other embodiments, if the auxiliary limit hole is provided with a corresponding push-unlocking inclined surface, it is sufficient to provide a corresponding unlocking part on the auxiliary limit pin to ensure normal self-unlocking.

[0044] In this embodiment, the auxiliary stop pin is connected to the auxiliary stop pin elastic member, and the main stop pin is connected to the main stop pin elastic member, and the elastic force is used to ensure effective locking. In other embodiments, gravity or other jacking forces can also be used to achieve effective locking.

[0045] In this embodiment, the main limit through hole is a long hole structure, and correspondingly, the plug-in portion on the main limit pin is a transverse extension portion, so that comprehensive locking and limiting can be achieved in the axial and circumferential directions. In other embodiments, a locking positioning in the circumferential direction can also be provided, and the corresponding axial positioning can be omitted.

[0046] In this embodiment, two main limit through holes are provided in the main limit structure, and correspondingly, two auxiliary limit holes are provided to correspond to the open position and the closed position of the knife switch in the switch cabinet. In other embodiments, a single corresponding main limit structure and auxiliary limit structure may be provided only corresponding to the closed position or the open position, in which case only one main limit through hole and one auxiliary limit through hole may be provided.

[0047] In this embodiment, a guide groove as an avoidance structure arranged between the two main limit through holes is used to realize rotational guidance of the operating shaft. The guide groove here can actually cooperate with the main limit through hole to realize one-way rotation control at the corresponding position, effectively avoiding erroneous operation.

Claims

1. A manual operating mechanism for an electrical switch, comprising a bracket and an operating shaft rotatably matched with the bracket and extending axially in the front-to-back direction, characterized in that: The front end of the operating shaft has a front cylinder section for inserting an operating handle to drive the operating shaft to rotate, and the rear end of the operating shaft is provided with an output limit groove for closely cooperating with the knife switch main shaft in the electrical switch, so as to drive the knife switch to perform corresponding opening and closing operations when the operating shaft is rotated. A main limit structure for limiting the rotation of the operating shaft is provided between the operating shaft and the bracket, and the main limit structure includes a main limit through hole provided on the cylinder wall of the front cylinder section and a main limit pin movably assembled on the bracket, the main limit pin having a plug-in portion for mating with the main limit through hole, and the main limit pin has a main locking position in its active stroke so that the plug-in portion enters the main limit through hole, and the main limit pin also has a pushing portion for the operating handle inserted in the front cylinder section to push outward so that the plug-in portion is released from the main limit through hole and unlocked, and a avoidance structure is provided on the cylinder wall of the front cylinder section for avoiding the pushing portion when the operating shaft rotates.

2. The manual operating mechanism for an electrical switch according to claim 1, characterized in that: An auxiliary limiting structure for limiting the rotation of the operating shaft is also provided between the operating shaft and the bracket, the auxiliary limiting structure includes a corresponding auxiliary limiting hole and an auxiliary limiting pin, the auxiliary limiting hole is fixedly provided on one of the bracket and the operating shaft, and the auxiliary limiting pin is movably assembled on the other, the auxiliary limiting pin has an auxiliary locking position in its movable stroke for being plugged into the auxiliary limiting hole when the operating shaft is rotated to a position corresponding to the auxiliary limiting pin and the auxiliary limiting hole, the auxiliary limiting pin is provided with a self-unlocking structure for actively applying force by the operating shaft to push the auxiliary limiting pin out of the auxiliary limiting hole and unlock it when the main limiting pin is unlocked to allow the operating shaft to rotate.

3. The manual operating mechanism for an electrical switch according to claim 2, characterized in that: The self-unlocking structure includes a push-unlocking inclined surface provided on the auxiliary limiting pin for push-matching with the auxiliary limiting hole, or includes an unlocking portion for push-matching with the push-unlocking inclined surface provided on the auxiliary limiting hole.

4. The manual operating mechanism for an electrical switch according to claim 2, characterized in that: The auxiliary limiting hole is fixed on the operating shaft, the auxiliary limiting pin is elastically and telescopically assembled on the bracket, and the auxiliary limiting pin is connected with an auxiliary limiting pin elastic member forcing the auxiliary limiting pin to move toward the operating shaft.

5. The manual operating mechanism for an electrical switch according to claim 1, characterized in that: The bracket is provided with a main limit pin elastic member for applying force to the main limit pin to force it to move to the main locking position.

6. The manual operating mechanism for an electrical switch according to claim 1, characterized in that: The main limiting through hole is a long hole structure extending axially along the operating shaft, and the plug-in portion is a transverse extension portion used to fit and mate with the long hole structure.

7. The manual operating mechanism for an electrical switch according to any one of claims 2 to 4, characterized in that: There are two main limiting through holes in the main limiting structure arranged at intervals along the circumference of the operating shaft, and the number of auxiliary limiting holes or auxiliary limiting pins in the auxiliary limiting structure is the same as the number of the main limiting through holes and are arranged at intervals along the circumference of the operating shaft.

8. The manual operating mechanism for an electrical switch according to claim 7, characterized in that: The avoidance structure is a guide groove extending along the circumference of the operating shaft and communicating with the corresponding two main limit through holes. When the operating shaft rotates, the pushing portion cooperates with the guide groove to guide the rotation of the operating shaft.

9. The manual operating mechanism for an electrical switch according to claim 8, characterized in that: The pushing portion of the main limiting pin is located on a side of the plug-in portion facing the operating shaft in the axial direction of the main limiting pin.

10. The manual operating mechanism for an electrical switch according to any one of claims 1 to 6, characterized in that: The bracket includes a front clamping plate, a rear clamping plate, a positioning plate and a limit fixing plate fixed between the two clamping plates. In the radial direction of the operating shaft, the limit fixing plate is located on the side of the positioning plate facing the operating shaft, and the main limit pin is movably assembled on the positioning plate and the limit fixing plate along the radial direction of the operating shaft.

Images