CN216487931U

CN216487931U - Circuit breaker and handle locking device thereof

Info

Publication number: CN216487931U
Application number: CN202121798745.9U
Authority: CN
Inventors: 王强; 郭德鑫; 刘亮; 梁世杰; 郑英川
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2021-08-03
Filing date: 2021-08-03
Publication date: 2022-05-10
Anticipated expiration: 2031-08-03

Abstract

The utility model provides a circuit breaker and handle locking device thereof is equipped with handle locking device in handle one side of circuit breaker, the locking includes the pivot and connects first locking plate and the second locking plate in the pivot the integrative spacing portion that is equipped with the handle that is used for restricting the circuit breaker of buckling of middle part avris of first locking plate and/or second locking plate, spacing portion is used for restricting the handle swing along the axial protrusion of pivot, and the first end protrusion of first locking plate is equipped with first locking portion, and the first end protrusion of second locking plate is equipped with the second sticking portion, the opposite and axial mutually perpendicular with the pivot of protrusion direction of first locking portion, second sticking portion, when first locking plate revolute axial locking or unblock direction rotation with the second locking plate, first locking portion and second sticking portion alternate segregation or draw close each other. The handle locking device is assembled on one side of the handle of the circuit breaker by changing the locking and unlocking states, so that the handle is prevented from being operated by mistake, and the handle locking device is convenient to assemble and disassemble.

Description

Circuit breaker and handle locking device thereof

Technical Field

The utility model relates to a low-voltage apparatus, in particular to a circuit breaker and a handle locking device thereof.

Background

A circuit breaker is a common switching element used in an electric power system to turn on and off an electric circuit and automatically break the electric circuit when an overcurrent or leakage fault occurs in the electric circuit. In moulded case circuit breaker, swing handle can realize the switch-on and the disconnection of circuit breaker, and in the practical application process, in order to prevent that the circuit breaker from being carried out the maloperation by carelessness, avoid influencing the break-make of circuit breaker and maintainer's life safety, use handle locking device to lock the handle usually, however, current handle locking device has the defect that the assembly is loaded down with trivial details, the structure is complicated and the cost of manufacture is high.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides a circuit breaker, which adopts a handle locking device with simple structure, high reliability and lower cost.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a handle locking device of circuit breaker, includes the pivot and connects in the pivot first locking plate and second locking plate the integrative spacing portion that is equipped with the handle that is used for spacing circuit breaker of buckling of middle part avris of first locking plate and/or second locking plate, spacing portion is protruding along the axial of pivot, and the first end protrusion of first locking plate is equipped with first locking portion, and the first end protrusion of second locking plate is equipped with the second sticking department, the protrusion opposite direction of first locking portion, second sticking department just is mutually perpendicular with the axial of pivot, when first locking plate revolutes axial locking or unblock direction rotation with the second locking plate, first locking portion and second sticking department looks mutual separation or draw close each other.

Furthermore, the middle parts of the first locking plate and the second locking plate close to the first end are provided with shaft holes for the rotating shaft to pass through.

Furthermore, a first operating part and a second operating part are respectively arranged at the second end of the first locking plate and the second end of the second locking plate in a protruding mode, and the protruding direction of the first operating part is opposite to that of the second operating part.

Furthermore, the second end of first locking plate is equipped with first lockhole, and the second end of second locking plate is equipped with the second lockhole, and when first locking plate and second locking plate rotated to locking state, first lockhole and second lockhole coincide mutually.

Further, the first locking part extends to one side along the plane of the first locking piece, the first locking part is vertical to the central axis of the first locking piece, the second locking part extends to the other side along the plane of the second locking piece, and the second locking part is vertical to the central axis of the second locking piece;

the first locking piece and the second locking piece rotate around the rotating shaft in the unlocking direction, two ends of the first locking piece and two ends of the second locking piece are separated from each other to form an X-shaped structure, the first locking part and the second locking part are close to each other, and the horizontal length between the first locking part and the second locking part is the minimum;

revolute the axial locking direction rotation at first locking plate and second locking plate, the both ends of first locking plate and second locking plate are drawn close gradually, and first locking portion separates gradually with the second sticking department, and until first locking plate and the coincidence of second locking plate make the horizontal length of first locking portion and second sticking department reach the biggest, and first locking plate, first locking portion and second locking portion, second sticking department form "perpendicular to" shape structure.

Furthermore, the first locking plate is of a strip-shaped sheet structure, a shaft hole for the rotating shaft to pass through is formed in the middle of the first locking plate close to the first end, the first end edge side of the first locking plate extends outwards along the plane in the horizontal direction to form a first locking part, the central axis of the first locking part is perpendicular to the central axis of the first locking plate, at least one through hole serving as a first locking hole is formed in the middle of the first locking plate between the shaft hole and the second end, the two through holes are arranged at intervals along the central axis of the first locking plate, the second end edge side of the first locking plate extends outwards along the plane in the horizontal direction to form a first operating part, and the extending direction of the first operating part is opposite to that of the first locking part;

the second locking plate is bar sheet structure, is equipped with the shaft hole that supplies the pivot to pass at the middle part that the second locking plate is close to first end, and the outside extension forms the second sticking department along the plane level by the first end avris of second locking plate, the central axis of second sticking department is mutually perpendicular with the central axis of second locking plate, is equipped with at least one perforation as the second lockhole at shaft hole to the second locking plate middle part between holding, and two perforation set up along the central axis interval of second locking plate, and the outside extension forms second operation portion along the plane level by the second end avris of second locking plate, the extending direction of second operation portion and second sticking department is opposite, sets up spacing portion in one side of second locking plate back to first locking plate, spacing portion is formed along the axial extension of pivot by the both sides edge of second locking plate.

Further, still include the locking piece, when first locking plate and second locking plate rotated to the locking state, the locking piece made the second end of first locking plate and second locking plate spacing in order to realize the locking.

Furthermore, an elastic ferrule is connected to the second end of the first lock plate or the second end of the second lock plate, the elastic ferrule serves as a locking piece, and when the first lock plate and the second lock plate rotate to a locking state, the second ends of the first lock plate and the second lock plate are sleeved into the elastic ferrule to achieve locking.

Further, the locking piece rotates to be connected and is served at the second of first locking plate's second end or second locking plate one side of locking piece has been seted up the locking groove, and when first locking plate and second locking plate rotated to the locking state, it made the second end of first locking plate and second locking plate hold spacing in order to realize the locking by the locking groove simultaneously to rotate the locking piece.

The utility model provides a circuit breaker, includes the shell and wears out the handle at shell middle part, is equipped with the mounting groove on the shell of handle one side, and above-mentioned handle locking device assembles in the mounting groove through switching locking and unblock state, one side that spacing position in handle is used for restricting the swing of handle.

Preferably, the handle stretches out of the shell through a handle hole in the shell, the mounting groove is formed in one side of the closing direction of the handle hole, the mounting groove is a pair of groove structures formed in side walls of two sides of the handle hole, openings of the pair of groove structures are opposite, when the first locking portion and the second locking portion are clamped in the mounting groove respectively, the handle locking device is locked on the shell, and the limiting portion of the handle locking device and the handle are used for limiting the handle to swing towards the closing direction relatively.

According to the circuit breaker and the handle locking device thereof, the handle locking device is assembled on one side of the handle of the circuit breaker, the handle locking device realizes locking or unlocking by rotating the first locking plate and the second locking plate, and is assembled in the mounting groove of the circuit breaker by changing the locking and unlocking states, so that the circuit breaker has the advantages of convenience in assembly and disassembly, the limiting part of the handle locking device is positioned on one side of the handle to limit the swinging of the handle, the handle is prevented from being operated by mistake, and the stable operation of the circuit breaker and the operation safety of maintenance personnel are guaranteed.

In addition, the pivot is located the position that first locking plate, second locking plate are closer to first end, makes the swing range of first locking plate, second locking plate less, does benefit to save space, and operates more laborsavingly.

In addition, handle locking device disposes split type locking piece or the locking piece of integral type, and the second end through locking first locking plate, second locking plate is swift efficient accomplishes locking operation and cost are lower.

Specially, as an optimal locking piece scheme, the locking piece rotates to be connected and is served at the second of first locking plate's second end or second locking plate one side of locking piece has been seted up the locking groove, when first locking plate is rotatory to the locking state with the second locking plate, rotates the locking piece and makes the second of first locking plate and second locking plate hold simultaneously by the locking groove spacing in order to realize the locking, whole easy operation is convenient.

Drawings

Fig. 1 is a schematic structural view of a circuit breaker and a handle locking device thereof according to the present invention;

fig. 2 is a schematic structural view of a handle locking device of a circuit breaker according to the present invention;

fig. 3 is a schematic structural view (without a base) of a handle lock device of the circuit breaker in an unlocked state according to the present invention;

fig. 4 is a schematic view of the handle lock device of the circuit breaker of the present invention in a locked state (without a base).

Detailed Description

The following describes a circuit breaker and a handle locking device thereof according to embodiments of the present invention with reference to fig. 1 to 4. A circuit breaker and a handle locking apparatus thereof of the present invention are not limited to the description of the following embodiments.

A handle locking device of a circuit breaker comprises a rotating shaft 13, a first locking piece 11 and a second locking piece 12 which are connected on the rotating shaft 13, a limiting part 14 for limiting the handle 3 of the circuit breaker is integrally bent at the middle edge side of the first locking piece 11 and/or the second locking piece 12, the limiting part 14 protrudes along the axial direction of the rotating shaft 13, the first end of the first locking piece 11 protrudes and is provided with a first locking part 111, the first end of the second locking piece 12 protrudes and is provided with a second locking part 121, the protruding directions of the first locking part 111 and the second locking part 121 are opposite and perpendicular to the axial direction of the rotating shaft 13, when the first locking piece 11 and the second locking piece 12 are rotated about the rotating shaft 13 in the locking or unlocking direction, the first locking portion 111 and the second locking portion 121 are separated from or moved close to each other, so as to be assembled in or disassembled from the mounting groove of the circuit breaker when unlocked and can not be disassembled from the mounting groove of the circuit breaker when locked.

According to the circuit breaker and the handle locking device 1 thereof, the handle locking device 1 is assembled on one side of the handle 3 of the circuit breaker, the handle locking device 1 is locked or unlocked by rotating the first locking plate 11 and the second locking plate 12, and is assembled in the mounting groove of the circuit breaker by changing the locking and unlocking states, so that the circuit breaker has the advantages of convenience in assembly and disassembly, the limiting part 14 of the handle locking device 1 is positioned on one side of the handle 3 to limit the swing of the handle 3, the handle 3 is prevented from being operated mistakenly, and the stable operation of the circuit breaker and the operation safety of maintenance personnel are guaranteed.

A detailed embodiment is provided with reference to fig. 1 to 4, the circuit breaker includes a housing 2, preferably, the housing 2 includes a base and a middle cover 21 covering the base, a handle hole is provided in the middle of the middle cover 21, a handle 3 of the circuit breaker extends out of the housing 2 through the handle hole, and the operation of opening and closing the circuit breaker is realized by swinging the handle 3. The middle cover 21 is provided with an installation groove, preferably, the installation groove is arranged on one side of the swing direction of the handle 3 (the closing direction in fig. 1), the installation groove is a pair of groove structures arranged on the side walls of the two sides of the handle hole, the openings of the pair of groove structures are opposite, and the handle locking device 1 for limiting the swing of the handle 3 is assembled in the installation groove. It should be noted that the mounting groove may be provided at another position of the housing 2, but the nearby arrangement is advantageous for reducing the volume of the handle lock device 1, and of course, the mounting groove is not provided in the handle hole, and the handle lock device 1 may be directly assembled at the corner position of the mounting groove.

The handle lock device 1 includes a rotation shaft 13 and a first locking piece 11 and a second locking piece 12 connected to the rotation shaft 13, the middle edge side of the first locking piece 11 and/or the second locking piece 12 is integrally bent to form a limiting part 14, the limiting part 14 protrudes along the axial direction of the rotating shaft 13 to limit the swing of the handle 3, a first locking portion 111 is protrudingly provided at a first end of the first locking piece 11, a second locking portion 121 is protrudingly provided at a first end of the second locking piece 12, the protruding directions of the first locking part 111 and the second locking part 121 are opposite and perpendicular to the axial direction of the rotating shaft 13, in the present embodiment, the first locking portion 111 extends horizontally leftward along the plane of the first locking piece 11, the first locking portion 111 is perpendicular to the central axis of the first locking piece 11, the second locking portion 121 extends horizontally rightward along the plane of the second locking piece 12, and the second locking portion 121 is perpendicular to the central axis of the second locking piece 12; when the first locking piece 11 and the second locking piece 12 rotate around the rotating shaft 13 to the unlocking direction, two ends of the first locking piece 11 and the second locking piece 12 are separated from each other, at this time, the first locking piece 11 and the second locking piece 12 form an "X" shaped structure (see fig. 3), the first locking portion 111 and the second locking portion 121 are close to each other, so that the horizontal length between the first locking portion 111 and the second locking portion 121 is minimum, so that the handle locking device 1 can be placed in the handle hole of the middle cover 21, then the first locking piece 11 and the second locking piece 12 rotate to the locking direction, two ends of the first locking piece 11 and the second locking piece 12 gradually close together, the first locking portion 111 and the second locking portion 121 gradually separate, preferably, when the first locking piece 11 and the second locking piece 12 completely overlap, the horizontal length of the first locking portion 111 and the second locking portion 121 reaches the maximum, at this time, the first locking piece 11, the first locking portion 111, the second locking portion 12, and the second locking piece 12, The second locking portion 121 forms a shape of "t" (see fig. 4), so that the handle locking device 1 can be clamped in the mounting groove through the first locking portion 111 and the second locking portion 121, and the handle locking device 1 is stably and conveniently disassembled and assembled.

Preferably, the middle part of first locking plate 11, second locking plate 12 that is close to first end is equipped with the shaft hole 131 that supplies pivot 13 to pass, so form laborsaving lever for the amplitude of rotation of the first end of first locking plate 11, second locking plate 12 is less than the amplitude of rotation of the second end of first locking plate 11, second locking plate 12, has reduced required motion space on well lid 21, and it is more laborsaving also to make the second of operation first locking plate 11, second locking plate 12 hold the time simultaneously. Further, a first operation portion 113 and a second operation portion 123 are respectively protruded from the second end of the first lock plate 11 and the second end of the second lock plate 12, the protruding direction of the first operation portion 113 is opposite to that of the second operation portion 123, and the first lock plate 11 and the second lock plate 12 can be pushed to rotate around the rotating shaft 13 for locking or unlocking by pushing the first operation portion 113 and the second operation.

Preferably, the handle locking device 1 further includes a locking member, the locking member may be a split structure, or an integrated structure connected to the first locking plate 11 or the second locking plate 12, and when the first locking plate 11 and the second locking plate 12 rotate to a locking state, the locking member limits the second ends of the first locking plate 11 and the second locking plate 12 to achieve locking.

When the locking member is a split structure, taking the locking member as the padlock 15 as an example, the first locking hole 112 is arranged at the second end of the first locking plate 11, the second locking hole 122 is arranged at the second end of the second locking plate 12, when the first locking plate 11 and the second locking plate 12 rotate to a locking state, the first locking hole 112 and the second locking hole 122 coincide with each other, and the locking member is connected with the second locking hole 122 through the coincident first locking hole 112 to realize locking. In addition, the locking member may also be a single elastic collar (not shown), and the locking member is locked by winding or sleeving the second ends of the first locking plate 11 and the second locking plate 12, of course, the elastic collar may also be directly connected to the second end of the first locking plate 11 or the second locking plate 12, and when the elastic collar is used as the locking member, the first locking hole 112 and/or the second locking hole 122 may be disposed or omitted.

When the locking piece is the integral structure of being connected with first locking piece 11 or second locking piece 12, the locking piece is shaft-like structure (not shown), the one end of locking piece and the second end of first locking piece 11 or the second end of second locking piece 12 rotate to be connected the locking groove has been seted up to the locking piece, when first locking piece 11 rotates to the lock state with second locking piece 12, it makes the second end of first locking piece 11 and the second end of second locking piece 12 hold by the locking groove simultaneously spacingly to rotate the locking piece, makes first locking piece 11, second locking piece 12 no longer rotate in order to realize the locking, when needs unblock, rotate the locking piece earlier and make the second end of first locking piece 11 and the second end of second locking piece 12 shift out the locking groove, pivoted first locking piece 11 and second locking piece 12 again.

As shown in fig. 2, a specific structure of first locking plate 11 and second locking plate 12 is provided, first locking plate 11 and second locking plate 12 are laminated and set up, and riveting has pivot 13 after the shaft hole 131 coincidence of first locking plate 11 and second locking plate 12, and in this embodiment, second locking plate 12 is towards handle 3, spacing portion 14 sets up on second locking plate 12 and towards handle 3, and of course, when first locking plate 11 is towards handle 3, spacing portion 14 sets up on first locking plate 11.

First locking plate 11 is bar sheet structure, is equipped with the shaft hole 131 that supplies pivot 13 to pass in first locking plate 11 near the middle part of first end, and outwards extend along the plane level by the first terminal avris of first locking plate 11 and form first locking portion 111, the central axis of first locking portion 111 is mutually perpendicular with the central axis of first locking plate 11, is equipped with two perforation as first locking hole 112 in shaft hole 131 to the first locking plate 11 middle part between the second end, and two perforation set up along the central axis interval of first locking plate 11, and outwards extend along the plane level by the second terminal avris of first locking plate 11 and form first operation portion 113, first operation portion 113 is opposite with the extending direction of first locking portion 111, and the bulge height of first operation portion 113 is less than the bulge height of first locking portion 111. Of course, the through hole as the first locking hole 112 may be one or more.

The second locking plate 12 is a strip-shaped plate structure, the middle of the second locking plate 12 near the first end is provided with a shaft hole 131 for the rotating shaft 13 to pass through, the first end edge side of the second locking plate 12 extends outwards along the plane level to form a second locking part 121, the central axis of the second locking part 121 is perpendicular to the central axis of the second locking plate 12, the middle of the second locking plate 12 between the shaft hole 131 and the second end is provided with two through holes as a second locking hole 122, the two through holes are arranged at intervals along the central axis of the second locking plate 12, the second end edge side of the second locking plate 12 extends outwards along the plane level to form a second operating part 123, the extending directions of the second operating part 123 and the second locking part 121 are opposite, the protruding height of the second operating part 123 is smaller than that of the second locking part 121, a limiting part 14 is arranged on one side of the second locking plate 12 opposite to the first locking plate 11, the limiting part 14 is formed by the axial extension of the two side edges of the second locking plate 12 along the rotating shaft 13, the limiting part 14 is arranged on two sides, so that the limiting width is larger, the contact stress area with the handle 3 is larger, the stability is higher, in addition, the limiting part 14 can be arranged in the middle of the second lock hole 122 close to the shaft hole 131, the rotating amplitude of the limiting part 14 at the position is minimum, the handle 3 can be limited to swing towards the direction of the handle locking device 1, and the circuit breaker is prevented from being switched on by mistake due to the swing towards the switching-on direction in the drawing. Of course, the through hole as the second locking hole 122 may be one or more.

The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.

Claims

1. The utility model provides a handle locking device of circuit breaker, includes pivot (13) and connects first locking plate (11) and second locking plate (12) on pivot (13), its characterized in that: the middle part avris of first locking plate (11) and/or second locking plate (12) is integrative to be buckled and is equipped with spacing portion (14) that is used for spacing handle (3) of circuit breaker, axial protrusion along pivot (13) is followed in spacing portion (14), and the first end protrusion of first locking plate (11) is equipped with first locking part (111), and the first end protrusion of second locking plate (12) is equipped with second sticking department (121), the opposite and axial mutually perpendicular with pivot (13) of protrusion direction of first locking part (111), second sticking department (121), when first locking plate (11) and second locking plate (12) revolute axle (13) and rotate to locking or unblock direction, first locking part (111) and second sticking department (121) looks mutual separation or draw close each other.

2. The handle locking apparatus of a circuit breaker according to claim 1, wherein: the middle parts of the first locking plate (11) and the second locking plate (12) close to the first end are provided with shaft holes (131) for the rotating shaft (13) to pass through.

3. The handle lock apparatus of circuit breaker according to claim 1, wherein: a first operating part (113) and a second operating part (123) are respectively arranged at the second end of the first locking piece (11) and the second end of the second locking piece (12) in a protruding mode, and the protruding directions of the first operating part (113) and the second operating part (123) are opposite.

4. The handle lock apparatus of circuit breaker according to claim 1, wherein: the second end of first locking plate (11) is equipped with first lockhole (112), and the second end of second locking plate (12) is equipped with second lockhole (122), and when first locking plate (11) and second locking plate (12) rotated to the locking state, first lockhole (112) and second lockhole (122) coincide mutually.

5. The handle lock apparatus of circuit breaker according to claim 1, wherein: the first locking part (111) extends to one side along the plane of the first locking piece (11), the first locking part (111) is perpendicular to the central axis of the first locking piece (11), the second locking part (121) extends to the other side along the plane of the second locking piece (12), and the second locking part (121) is perpendicular to the central axis of the second locking piece (12);

the first locking piece (11) and the second locking piece (12) rotate around the rotating shaft (13) to the unlocking direction, two ends of the first locking piece (11) and the second locking piece (12) are separated from each other to form an X-shaped structure, the first locking part (111) and the second locking part (121) are close to each other, and the horizontal length between the first locking part (111) and the second locking part (121) is minimum;

revolve rotation axis (13) to the locking direction rotation at first locking plate (11) and second locking plate (12), first locking plate (11) draw close gradually with the both ends of second locking plate (12), first locking portion (111) and second sticking department (121) separate gradually, until first locking plate (11) and second locking plate (12) coincidence, make the horizontal length of first locking portion (111) and second sticking department (121) reach the biggest, first locking plate (11), first locking portion (111) and second locking plate (12), second sticking department (121) form "perpendicular T" shape structure.

6. The handle lock apparatus of circuit breaker according to claim 1, wherein:

first locking plate (11) are bar sheet structure, are equipped with shaft hole (131) that supply pivot (13) to pass at first locking plate (11) near the middle part of first end, extend outward along the plane level by the first end avris of first locking plate (11) and form first locking portion (111), the central axis of first locking portion (111) is mutually perpendicular with the central axis of first locking plate (11), is equipped with at least one perforation as first lockhole (112) in first locking plate (11) middle part between shaft hole (131) to the second end, and two perforations set up along the central axis interval of first locking plate (11), extend outward along the plane level by the second end avris of first locking plate (11) and form first operation portion (113), the extending direction of first operation portion (113) and first locking portion (111) is opposite;

the second locking plate (12) is a strip-shaped sheet structure, a shaft hole (131) for the rotating shaft (13) to pass through is arranged in the middle of the second locking plate (12) close to the first end, a second locking part (121) is formed by extending the first end edge side of the second locking plate (12) outwards along the plane level, the central axis of the second locking part (121) is perpendicular to the central axis of the second locking plate (12), at least one through hole serving as a second locking hole (122) is arranged in the middle of the second locking plate (12) from the shaft hole (131) to the second end, the two through holes are arranged at intervals along the central axis of the second locking plate (12), a second operating part (123) is formed by extending the second end edge side of the second locking plate (12) outwards along the plane level, the extending direction of the second operating part (123) is opposite to that of the second locking part (121), and a limiting part (14) is arranged on one side of the second locking plate (12) back to the first locking plate (11), the limiting part (14) is formed by extending the edges of the two sides of the second locking plate (12) along the axial direction of the rotating shaft (13).

7. The handle lock apparatus of a circuit breaker according to any one of claims 1 to 6, wherein: the locking device further comprises a locking piece, and when the first locking piece (11) and the second locking piece (12) rotate to a locking state, the locking piece enables the second ends of the first locking piece (11) and the second locking piece (12) to be limited to realize locking.

8. The handle lock apparatus of a circuit breaker according to claim 7, wherein: an elastic ferrule is connected to the second end of the first locking plate (11) or the second end of the second locking plate (12), the elastic ferrule serves as a locking piece, and when the first locking plate (11) and the second locking plate (12) rotate to a locking state, the second ends of the first locking plate (11) and the second locking plate (12) are simultaneously sleeved in the elastic ferrule to achieve locking.

9. The handle lock apparatus of a circuit breaker according to claim 7, wherein: the locking piece rotates to be connected on the second end of first locking plate (11) or the second of second locking plate (12) is served the locking groove has been seted up to one side of locking piece, when first locking plate (11) and second locking plate (12) are rotatory to the locking state, rotates the locking piece and makes the second end of first locking plate (11) and second locking plate (12) hold spacing in order to realize the locking by the locking groove simultaneously.

10. The utility model provides a circuit breaker, includes shell (2) and wears out handle (3) in shell (2) middle part, its characterized in that: an installation groove is arranged on the shell (2) at one side of the handle (3), the handle locking device (1) according to any one of claims 1-9 is assembled in the installation groove by switching locking and unlocking states, and the limiting part (14) is positioned at one side of the handle (3) and used for limiting the swing of the handle (3).

11. A circuit breaker according to claim 10, wherein: handle (3) stretch out shell (2) through the handle hole on shell (2), the mounting groove sets up in the closing direction one side of handle hole, and the mounting groove is the pair of groove structure who sets up at handle hole both sides lateral wall, and a pair of groove structure's opening is relative, and when first locking portion (111) and second locking portion (121) block respectively in the mounting groove, handle locking device (1) is locked on shell (2), and spacing portion (14) and handle (3) of handle locking device (1) are used for relatively restricting handle (3) to closing direction swing.