CN216054376U - Locking mechanical system and circuit breaker - Google Patents

Abstract

The application discloses locking mechanical system and circuit breaker relates to the switch electrical field. The locking mechanism comprises a shell, a handle and a locking piece, wherein the handle and the locking piece are arranged in the shell, the handle is connected with the shell in a sliding mode, the locking piece is connected with the shell in a rotating mode, a through hole is formed in the shell, a limiting bulge matched with the through hole is formed in the locking piece, and an elastic piece connected with the locking piece is further arranged in the shell; under the condition that the handle slides out of the shell, the handle drives the locking piece to rotate until the limiting protrusion retracts into the shell; under the condition that the handle slides into the shell, the elastic piece drives the locking piece to rotate reversely until the limiting protrusion protrudes out of the shell. The arrangement form can be simplified, and the safety in use is improved.

Description

Locking mechanical system and circuit breaker

Technical Field

The application relates to the field of switch electricity, in particular to a locking mechanism and a circuit breaker.

Background

The circuit breaker is divided into: the plug-in circuit breaker can effectively improve the safety of the use industry of electrical equipment by using plug-in circuit breakers, and the structures of the plug-in circuit breakers are developed into various types in order to meet the installation requirements of various electrical equipment along with the wide use of the plug-in circuit breaker on various electrical equipment.

The use of the plug-in circuit breaker can not only provide various safety protection performances of the circuit breaker for power lines and electrical equipment, but also meet the requirements of different electrical equipment on the quality of a power supply, and the circuit breaker can be conveniently assembled or withdrawn in a plug-in mode. However, the insertion type circuit breaker may be erroneously installed in the case in a closed state, closed when the circuit breaker is not installed in place, or erroneously pulled out directly from the case in a closed state.

For preventing hot-line operation risk, current plug-in circuit breaker usually can be equipped with corresponding locking mechanical system, but the locking mechanical system structure of current structure is comparatively complicated, need set up corresponding locking piece and mechanism such as driving medium usually, and the part that relates is more, and the space that occupies is more, and the transmission cooperation is also comparatively complicated.

SUMMERY OF THE UTILITY MODEL

An object of the present application is to provide a locking mechanism and a circuit breaker, which can simplify the arrangement form and improve the safety in use.

The embodiment of the application is realized as follows:

in one aspect of the embodiment of the application, a locking mechanism is provided, which comprises a housing, and a handle and a locking piece which are arranged in the housing, wherein the handle is connected with the housing in a sliding manner, the locking piece is connected with the housing in a rotating manner, a via hole is arranged on the housing, a limiting protrusion matched with the via hole is arranged on the locking piece, and an elastic piece connected with the locking piece is also arranged in the housing; under the condition that the handle slides out of the shell, the handle drives the locking piece to rotate until the limiting protrusion retracts into the shell; under the condition that the handle slides into the shell, the elastic piece drives the locking piece to rotate reversely until the limiting protrusion protrudes out of the shell.

Optionally, the locking piece is including the first linking arm, rotation portion and the second linking arm that connect gradually, the locking piece passes through rotation portion with the casing rotates to be connected, first direction inclined plane has on the first linking arm, be provided with on the handle with first direction inclined plane complex second direction inclined plane, spacing arch is located on the second linking arm.

Optionally, a rotating shaft or a connecting hole is arranged on the rotating part, so that the rotating part is rotatably connected with the shell through the rotating shaft or the connecting hole.

Optionally, the elastic element is a torsion spring, the torsion spring is sleeved on the rotating shaft, or the torsion spring is sleeved on the pin shaft of the casing, the first elastic arm of the torsion spring abuts against the casing, and the second elastic arm of the torsion spring abuts against the second connecting arm.

Optionally, a buckle is arranged on the second connecting arm, and the second elastic arm abuts against the buckle.

Optionally, the second connecting arm is further provided with a limiting boss, the limiting boss and the limiting protrusion are respectively located on two opposite sides of the second connecting arm, and the handle is provided with a supporting table, so that the supporting table can correspond to the limiting boss.

Optionally, a first protrusion is further disposed on the second connecting arm, and a second protrusion is correspondingly disposed in the housing, so that the first protrusion abuts against the second protrusion when the limiting protrusion retracts into the housing.

Optionally, the extension line of the first connecting arm and the second connecting arm have a preset included angle.

Optionally, a handle is provided on the handle.

In another aspect of the embodiments of the present application, there is provided a circuit breaker, including the locking mechanism as described in any one of the above, and an operating mechanism connected to a handle of the locking mechanism, the operating mechanism being configured to open or close the circuit breaker.

The beneficial effects of the embodiment of the application include:

the locking mechanical system and the circuit breaker that this application embodiment provided, through the casing to and handle and the locking piece of setting in the casing, under the condition of handle roll-off casing (the circuit breaker is in under the state of separating brake promptly), the handle can drive the locking piece and rotate to in the spacing protruding withdrawal casing, at this moment, the circuit breaker can insert or extract quick-witted case. Under the condition that the handle slided into the casing (the circuit breaker is in under the combined floodgate state promptly), the elastic component drives the locking piece and rotates to spacing protruding casing, and is subject to the handle, in the unable retraction casing of spacing arch, if the circuit breaker had not inserted quick-witted incasement this moment, then the circuit breaker can't insert quick-witted case, if circuit breaker and quick-witted case were in normal complex state this moment, then the quick-witted case can't be extracted to the circuit breaker to security when guaranteeing the use. When the circuit breaker needs to be pulled out of the case, the handle needs to slide out of the shell so that the limiting protrusion retracts into the shell. Similarly, when the circuit breaker is inserted into the case, the limiting protrusion is required to retract into the case, the handle is limited by the locking piece, and when the circuit breaker is inserted into the case, the handle cannot slide into the case until the circuit breaker is inserted in place. The locking subassembly that this application embodiment provided, when realizing above-mentioned action, only need the casing to and set up in the casing handle, locking piece and elastic component mutually support can, need not other numerous and diverse structures and transmission, can simplify the setting form, and the security when promoting the use.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic structural diagram of a locking mechanism according to an embodiment of the present disclosure;

fig. 2 is a second schematic structural diagram of a locking mechanism according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of the limiting protrusion provided in the embodiment of the present application, which is matched with a chassis;

fig. 4 is a third schematic structural diagram of a locking mechanism according to an embodiment of the present application;

FIG. 5 is a fourth illustration of the locking mechanism according to the embodiment of the present application;

FIG. 6 is a schematic structural diagram of a locking element according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a handle provided in an embodiment of the present application.

Icon: 100-a locking mechanism; 105-a chassis; 110-a housing; 112-a via hole; 114-a second protrusion; 120-a handle; 122-a second guide ramp; 124-holding table; 126-a handle; 130-a locking element; 132-a limit projection; 134-first connecting arm; 1342-a first guide ramp; 135-a rotating part; 136-a second connecting arm; 137-buckle; 138-a limit boss; 139-a first projection; 140-torsion spring.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In the process of using the plug-in type circuit breaker, there may be risks that the circuit breaker is erroneously mounted in the case in a closed state, the circuit breaker is closed when not mounted in place, or the circuit breaker is directly and erroneously pulled out from the case in a closed state. For preventing hot-line operation risk, current plug-in circuit breaker usually can be equipped with corresponding locking mechanical system, but the locking mechanical system structure of current structure is comparatively complicated, need set up corresponding locking piece and mechanism such as driving medium usually, and the part that relates is more, and the space that occupies is more, and the transmission cooperation is also comparatively complicated. The embodiment of the application provides the following scheme, so that the setting form is simplified, and the safety in use is improved.

Referring to fig. 1, fig. 2, fig. 4 and fig. 5, the present embodiment provides a locking mechanism 100, which includes a housing 110, and a handle 120 and a locking member 130 disposed in the housing 110, wherein the handle 120 is slidably connected to the housing 110, the locking member 130 is rotatably connected to the housing 110, the housing 110 is provided with a via hole 112, the locking member 130 is provided with a limiting protrusion 132 engaged with the via hole 112, and the housing 110 is further provided with an elastic member connected to the locking member 130; when the handle 120 slides out of the housing 110, the handle 120 drives the locking member 130 to rotate until the limiting protrusion 132 retracts into the housing 110; when the handle 120 slides into the housing 110, the elastic member drives the locking member 130 to rotate reversely until the limiting protrusion 132 protrudes out of the housing 110.

Specifically, by slidably connecting the handle 120 with the housing 110, when the handle 120 slides into the housing 110, the handle 120 drives the operating mechanism in the housing 110 to perform a closing operation; when the handle 120 slides out of the housing 110, the handle 120 drives the operating mechanism in the housing 110 to perform the opening operation. Therefore, when the handle 120 slides into the housing 110, the circuit breaker is in a closed state; when the handle 120 slides out of the housing 110, the circuit breaker is in an open state. When the breaker is inserted into the cabinet 105, in order to ensure the safety of the operation, it is necessary to ensure that the breaker is in an open state, and the breaker cannot be accidentally closed during the process of inserting the breaker into the cabinet 105. Thus, the circuit breaker can only be inserted into the enclosure 105 when the handle 120 slides out of the housing 110, and the handle 120 cannot slide into the housing 110 during insertion of the circuit breaker into the enclosure 105.

By providing the through hole 112 on the housing 110 and providing the limiting protrusion 132 on the locking member 130, which is engaged with the through hole 112, when the handle 120 slides out of the housing 110, the handle 120 exerts a force on the locking member 130, so that the handle 120 drives the locking member 130 to rotate until the limiting protrusion 132 retracts into the housing 110. Alternatively, one side surface of the limiting protrusion 132 is an inclined surface, and when the breaker is inserted into the case in the off state, the inner wall of the case presses the inclined surface of the limiting protrusion 132, so that the locking member 130 rotates until the limiting protrusion 132 retracts into the housing 110, and the handle 120 does not need to apply force to the locking member 130. At this time, interference between the limiting protrusion 132 and the case 105 is not generated, so that the circuit breaker can be smoothly inserted into the case 105. When the breaker is not inserted in place, the limiting protrusion 132 is blocked by the inner wall of the case 105 and cannot protrude out of the housing 110, and when the limiting protrusion 132 retracts into the housing 110, the locking member 130 blocks the sliding path of the handle 120, and the handle 120 cannot slide into the housing 110, so that the breaker is in an opening state before being inserted into the case 105 in place, and the safety during insertion is ensured.

After the circuit breaker is inserted into the case 105 and is in place, in the process that the handle 120 slides into the housing 110, the handle 120 no longer provides a force to the locking member 130, and the inner wall of the case 105 no longer blocks the limiting protrusion 132 from protruding out of the housing 110, and under the action of the elastic member, the elastic member drives the locking member 130 to rotate reversely until the limiting protrusion 132 protrudes out of the housing 110, so that the locking member is clamped with the case 105, and the circuit breaker is prevented from being pulled out of the case 105 in a closing state of the circuit breaker (as shown in fig. 3). For example, when the limiting protrusion 132 is clamped with the case 105, a limiting hole corresponding to the via hole 112 may be disposed on the case 105, so that the limiting protrusion 132 sequentially passes through the via hole 112 and the limiting hole, thereby relatively fixing the case 105 and the circuit breaker. When the breaker needs to be taken out, the handle 120 is pulled firstly, the handle 120 slides out of the shell 110, so that the breaker is switched off, and when the handle 120 is pulled out, the handle acts on the locking piece 130, so that the limiting protrusion 132 retracts into the shell 110, and the breaker can be taken out after the locking between the limiting protrusion 132 and the case 105 is released. When the circuit breaker is in a closing state, the handle 120 slides into the housing 110, and the handle 120 no longer provides a force to the locking member 130, under the action of the elastic member, the elastic member drives the locking member 130 to reversely rotate to the limiting protrusion 132 to protrude out of the housing 110, at this time, when the circuit breaker is to be inserted into the housing 110, the limiting protrusion 132 needs to be retracted into the housing 110, and when the handle 120 slides into the housing 110, the rotation of the locking member 130 is limited, so that the circuit breaker cannot be inserted into the case 105 in the closing state.

It should be noted that the arrangement form of the elastic member is not particularly limited in the embodiment of the present application, as long as the limiting protrusion 132 of the locking member 130 can have the elastic force protruding out of the housing 110. For example, the elastic member may be a torsion spring disposed on the locking member 130 or the housing 110, or may be a compression spring disposed between the housing 110 and the locking member 130.

According to the locking mechanism 100 provided by the embodiment of the application, through the housing 110, and the handle 120 and the locking member 130 arranged in the housing 110, when the handle 120 slides out of the housing 110 (i.e. the circuit breaker is in an open state), the handle 120 can drive the locking member 130 to rotate until the limiting protrusion 132 retracts into the housing 110, and at this time, the circuit breaker can be inserted into or pulled out of the case 105. Under the condition that handle 120 slides into casing 110 (namely the circuit breaker is in the state of closing a floodgate), the elastic component drives locking piece 130 and rotates to spacing arch 132 and protrudes casing 110, and is restricted by handle 120, and spacing arch 132 can't be drawn back in casing 110, if the circuit breaker did not insert in quick-witted case 105 this moment, then the circuit breaker can't insert quick-witted case 105, if circuit breaker and quick-witted case 105 are in normal mating state this moment, then the circuit breaker can't be extracted quick-witted case 105 to security when guaranteeing the use. When the circuit breaker needs to be pulled out of the cabinet 105, the handle 120 needs to be slid out of the housing 110 to retract the position restricting protrusion 132 into the housing 110. Similarly, when the circuit breaker is inserted into the cabinet 105, the limiting protrusion 132 needs to be retracted into the housing 110, and at this time, the handle 120 is limited by the locking member 130, and during the process of inserting the circuit breaker into the cabinet 105, the handle 120 cannot slide into the housing 110 until the circuit breaker is inserted into the position. When the locking assembly provided by the embodiment of the application realizes the actions, only the shell 110 is needed, and the handle 120, the locking piece 130 and the elastic piece which are arranged in the shell 110 are matched with each other, so that other complicated structures and transmission are not needed, the arrangement form can be simplified, and the safety in use is improved.

As shown in fig. 1, 6 and 7, the locking member 130 includes a first connecting arm 134, a rotating portion 135 and a second connecting arm 136 which are connected in sequence, the locking member 130 is rotatably connected to the housing 110 through the rotating portion 135, the first connecting arm 134 has a first guiding inclined plane 1342, the handle 120 has a second guiding inclined plane 122 which is matched with the first guiding inclined plane 1342, and the limiting protrusion 132 is located on the second connecting arm 136.

Specifically, in the process of rotatably coupling the locking member 130 to the housing 110 through the rotating portion 135, the first coupling arm 134 and the second coupling arm 136 are respectively rotated around the rotating portion 135 as a rotation center. When the handle 120 slides out of the housing 110 from the inside of the housing 110 (i.e. during the process of switching from the state of fig. 2 to the state of fig. 1), as the handle 120 slides out of the housing 110, the second guiding inclined surface 122 on the handle 120 gradually approaches the first guiding inclined surface 1342 of the first connecting arm 134 until the first guiding inclined surface 1342 abuts against the second guiding inclined surface 122, and at this time, as the handle 120 continues to slide outward, the second guiding slope 122 exerts a force on the first guiding slope 1342, causing the first connecting arm 134 to receive a component of the rotation, so as to rotate the locking member 130, the first guiding inclined surface 1342 and the second guiding inclined surface 122 may only have line contact during the rotation of the locking member 130, and the embodiment of the present application does not specifically limit the contact form between the first guiding inclined surface 1342 and the second guiding inclined surface 122 as long as it can ensure that the locking member 130 has a component force of the rotation to make the locking member 130 transition from the state of fig. 1 to the state of fig. 4. At this time, the stopper projection 132 on the second connecting arm 136 can be retracted into the housing 110 by the handle 120.

In an alternative embodiment of the present application, a rotating shaft or a connecting hole is provided on the rotating part 135, so that the rotating part 135 is rotatably connected with the housing 110 through the rotating shaft or the connecting hole.

Specifically, when the locking member 130 is rotatably connected to the housing 110 through the rotating portion 135, in the case that a rotating shaft is provided on the rotating portion 135, a sleeve may be correspondingly provided in the housing 110, so that the rotating shaft is inserted into the sleeve, thereby allowing the locking member 130 and the housing 110 to rotate relatively. It can be understood that, in the case that the rotating portion 135 is provided with a connecting hole, a pin may be correspondingly provided in the housing 110, so that the rotating portion 135 is sleeved on the pin through the connecting hole, thereby enabling the locking member 130 and the housing 110 to rotate relatively.

In an optional embodiment of the present application, the elastic member is a torsion spring 140, the torsion spring 140 is sleeved on the rotating shaft, or the torsion spring 140 is sleeved on the pin shaft of the housing 110, and the first elastic arm of the torsion spring 140 abuts against the housing 110, and the second elastic arm of the torsion spring 140 abuts against the second connecting arm 136.

Thus, when the torsion spring 140 is deformed due to stress, the torsion spring 140 is sleeved on the rotating shaft or the pin shaft, so that the torsion spring 140 can be limited, the position deviation caused by the stress of the torsion spring 140 is prevented, and the stability in use is improved. The first elastic arm of the torsion spring 140 abuts against the housing 110, and the second elastic arm of the torsion spring 140 abuts against the second connecting arm 136 to provide an acting force for rotating the second connecting arm 136, so that the limiting protrusion 132 on the second connecting arm 136 has a moving tendency of protruding out of the housing 110.

As shown in fig. 6, the second connecting arm 136 is provided with a buckle 137, and the second elastic arm abuts against the buckle 137. Therefore, the second elastic arm and the second connecting arm 136 can be stably abutted, and the torsion spring is prevented from being deformed, the second elastic arm and the second connecting arm 136 are staggered and loosened, and the abutting stability is favorably improved.

As shown in fig. 6 and 7, the second connecting arm 136 is further provided with a limiting boss 138, the limiting boss 138 and the limiting protrusion 132 are respectively located at two opposite sides of the second connecting arm 136, and the handle 120 is provided with the abutting table 124, so that the abutting table 124 can correspond to the limiting boss 138.

Specifically, when the circuit breaker is in a closed state, the handle 120 slides into the interior, and the limiting protrusion 132 protrudes out of the housing 110, at this time, the abutting table 124 and the limiting boss 138 are in a corresponding form as shown in fig. 2, and when the limiting protrusion 132 retracts into the housing 110, the limiting boss 138 abuts against the abutting table 124, so that the rotation of the locking member 130 is limited, and the circuit breaker and the case 105 are kept in a locked state. When the circuit breaker is in an open state and the circuit breaker is inserted into the case 105, the limiting protrusion 132 is limited by the inner wall of the case 105, so that the limiting protrusion 132 retracts into the housing 110 (as shown in fig. 4), at this time, if the handle 120 is pushed to slide into the housing 110, the supporting table 124 and the limiting boss 138 are in a corresponding form as shown in fig. 5, and the limiting boss 138 is located on a sliding path of the handle 120, so that when the handle 120 slides into the housing 110, the supporting table 124 can support the limiting boss 138, so as to limit the sliding of the handle 120, and the circuit breaker cannot be closed.

As shown in fig. 1 and 6, the second connecting arm 136 is further provided with a first protrusion 139, and the housing 110 is correspondingly provided with a second protrusion 114, so that when the limiting protrusion 132 retracts into the housing 110, the first protrusion 139 abuts against the second protrusion 114.

Specifically, in the case where the position restricting protrusion 132 is retracted into the case 110, the circuit breaker is in the open state. When the circuit breaker needs to be taken out of the cabinet 105, the circuit breaker can be taken out of the cabinet 105 by directly pulling the handle 120. In order to prevent the handle 120 from acting on the operating mechanism of the circuit breaker and causing the operating mechanism to be damaged by an excessive force when the handle 120 is pulled, the first protrusion 139 abuts against the second protrusion 114 to limit the rotation of the locking member 130. At this time, the acting force for pulling out the circuit breaker can be transmitted between the first guiding inclined plane 1342 and the second guiding inclined plane 122, which is beneficial to protecting the operating mechanism when the circuit breaker is pulled out.

As shown in fig. 6, the extension line of the first connecting arm 134 has a predetermined angle with the second connecting arm 136. As such, it is convenient to provide a rotational force to the locking member 130 when the handle 120 is pulled to slide the handle 120 out of the housing 110. The preset included angle may be set to be 110 ° to 150 ° according to actual needs, and may be set to be 110 °, 120 °, 150 °, or the like. In addition, the length of the second connecting arm 136 can be set to be greater than that of the first connecting arm 134 according to requirements, so that the locking member 130 can be better limited with the handle 120 through the second connecting arm 136 when rotating.

In an alternative embodiment of the present application, as shown in fig. 7, a pull handle 126 is provided on the handle 120, so as to save more labor and reduce the difficulty of operation when pulling out the handle 120.

The embodiment of the present application further discloses a circuit breaker, which includes the locking mechanism 100 in the foregoing embodiments, and an operating mechanism connected to the handle 120 of the locking mechanism 100, where the operating mechanism is used to open or close the circuit breaker. The circuit breaker includes the same structure and advantageous effects as the locking mechanism 100 in the foregoing embodiment. The structure and advantages of the locking mechanism 100 have been described in detail in the foregoing embodiments, and are not described in detail herein.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A locking mechanism is characterized by comprising a shell, a handle and a locking piece, wherein the handle and the locking piece are arranged in the shell, the handle is connected with the shell in a sliding mode, the locking piece is connected with the shell in a rotating mode, a through hole is formed in the shell, a limiting bulge matched with the through hole is formed in the locking piece, and an elastic piece connected with the locking piece is further arranged in the shell; under the condition that the handle slides out of the shell, the handle drives the locking piece to rotate until the limiting protrusion retracts into the shell; under the condition that the handle slides into the shell, the elastic piece drives the locking piece to rotate reversely until the limiting protrusion protrudes out of the shell.

2. The locking mechanism according to claim 1, wherein the locking member includes a first connecting arm, a rotating portion and a second connecting arm connected in sequence, the locking member is rotatably connected to the housing through the rotating portion, the first connecting arm has a first guiding inclined surface, the handle has a second guiding inclined surface engaged with the first guiding inclined surface, and the limiting protrusion is located on the second connecting arm.

3. The lock mechanism as claimed in claim 2, wherein a rotation shaft or a connection hole is provided on the rotation portion so that the rotation portion is rotatably connected to the housing through the rotation shaft or the connection hole.

4. The locking mechanism of claim 3, wherein the elastic member is a torsion spring, the torsion spring is sleeved on the rotating shaft, or the torsion spring is sleeved on the pin of the housing, and the first elastic arm of the torsion spring abuts against the housing, and the second elastic arm of the torsion spring abuts against the second connecting arm.

5. The locking mechanism of claim 4, wherein the second connecting arm is provided with a catch, and the second resilient arm abuts against the catch.

6. The locking mechanism according to any one of claims 2 to 5, wherein the second connecting arm is further provided with a limiting boss, the limiting boss and the limiting boss are respectively located on two opposite sides of the second connecting arm, and the handle is provided with a holding table so that the holding table can correspond to the limiting boss.

7. The locking mechanism according to any one of claims 2 to 5, wherein the second connecting arm is further provided with a first protrusion, and a second protrusion is correspondingly provided in the housing, so that the first protrusion abuts against the second protrusion when the limiting protrusion retracts into the housing.

8. The locking mechanism of any one of claims 2 to 5, wherein the extension of the first connecting arm is at a predetermined angle to the second connecting arm.

9. A locking mechanism according to any one of claims 2 to 5, wherein a pull handle is provided on the handle.

10. A circuit breaker, characterized in that it comprises a locking mechanism according to any one of claims 1 to 9, and an operating mechanism connected to a handle of the locking mechanism for opening or closing the circuit breaker.

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