CN112820595A - Double-lock plug-in circuit breaker capable of preventing switching-on and plugging-out - Google Patents

Abstract

A double-lock plug-in circuit breaker capable of preventing switching-on plugging comprises a button mechanism, a transmission disc, an operating mechanism, a first locking piece with a first lock and a second locking piece with a second lock, wherein a reset spring drives the first lock and the second lock to simultaneously extend to the extending positions of the first lock and the second lock in a switching-on state and a switching-off state; in a closing state, the transmission disc locks the second locking piece to prevent the first lock head and the second lock head from retreating to the retracted position; in the brake-off state, when the second locking piece is subjected to a retraction external force to enable the second lock head to retract to the retraction position, the second locking piece locks the transmission disc to prevent the transmission disc from rotating towards the brake-on direction; the button mechanism can also drive the circuit breaker to be converted into an unlocking state, namely the button mechanism drives the first locking piece, then the first locking piece drives the first locking head and drives the second locking head to simultaneously retreat to the retraction position, and the circuit breaker is converted into the unlocking state, so that the capacity of resisting brute force plugging is improved.

Description

Double-lock plug-in circuit breaker capable of preventing switching-on and plugging-out

Technical Field

The invention relates to the technical field of low-voltage terminal electric appliances, in particular to a plug-in circuit breaker which can reliably prevent switch-on insertion and switch-on extraction.

Background

With the rapid development of network communication technology, especially the application popularization of 5G networks, the requirement for effectively improving the safety of electrical equipment by a circuit breaker is higher and higher, the traditional power supply mode of connecting a plurality of sockets and plugboards with one terminal circuit breaker is far from meeting the requirements of safe power utilization and equipment protection, for example, the terminal circuit breaker for 5G communication equipment needs to be upgraded and improved in various aspects such as miniaturization, intellectualization, reliability, stability and the like, and more new matching structures need to be expanded on the use requirement, for example, the circuit breaker is required to be conveniently plugged and pulled out like a plug and can be locked at the installation position. The novel circuit breaker is called as a plug-in circuit breaker, not only can provide various safety protection performances of the circuit breaker for power lines and electrical equipment, but also can meet the requirements of different electrical equipment on power quality, and can be conveniently assembled in/disassembled from the circuit in a plug-in mode. For this reason, the structure of the plug-in circuit breaker has been developed to various kinds, but under the trend of miniaturization development of the electrical equipment, the overall structure, operation mode and safe use of the matched circuit breaker still need to be further improved, optimized and upgraded urgently.

The existing plug-in circuit breaker only has the function of preventing the circuit breaker from being pulled out in a closing state, but cannot effectively prevent brute force plugging, does not have the function of preventing the circuit breaker from being plugged in the closing state, and does not have the function of preventing the circuit breaker from being accidentally switched on in the plugging process. The conventional plug-in miniature circuit breaker generally needs three parts, namely a lock button, a fastener and a release piece, so that the function of preventing switching-on and pulling-out can be realized, and the fastener adopts a structure of an inclined strut type fulcrum, so that the mechanical structure is unreasonable, the abnormal deformation and/or displacement of a stressed device are easily caused, and the phenomenon that a locking boss is not locked with the slippage of a cabinet easily occurs particularly during brute force plugging. In addition, due to the unreasonable overall structure scheme, a structure for preventing the locking boss from accidentally retracting in a closing state cannot be adopted, and a structure for preventing the circuit breaker from accidentally closing in the plugging and unplugging process is difficult to adopt. The existing plug-in circuit breaker still has structural problems of complex structure, large number of parts and the like, so that the performance levels of safety, reliability and the like of the existing plug-in circuit breaker still need to be improved, and the requirements of the market in the aspects of use functions such as miniaturization and easy operation, structural restriction on manufacturing cost, automatic large-scale production and the like can not be met far.

Disclosure of Invention

The invention aims to overcome the defects that the existing plug-in circuit breaker cannot prevent the plug-in a switch-on state, the switch-on in the plugging and unplugging process and the brute force resistance plugging and unplugging in the prior art, and provides a double-lock plug-in circuit breaker which can prevent the switch-on plugging and unplugging, can prevent the switch-on in the plugging and unplugging process and can effectively resist the brute force plugging and unplugging.

In order to achieve the purpose, the invention adopts the following technical scheme.

A double-lock plug-in circuit breaker capable of preventing switching-on plugging comprises a shell of the circuit breaker, a button mechanism, a transmission disc and an operating mechanism, wherein the transmission disc is rotatably installed in the shell, the button mechanism is linked with the operating mechanism through the transmission disc and can control the circuit breaker to be switched between a switching-on state and a switching-off state, the circuit breaker further comprises a first locking piece with a first lock, a second locking piece with a second lock and a reset spring, the first lock and the second lock are respectively provided with an extending position extending out of the shell and a retracting position retracting into the shell, and the reset spring drives the first lock and the second lock to simultaneously extend out of the extending positions in the switching-on state and the switching-off state; in the closing state, the transmission disc locks the second locking piece to prevent the first lock head and the second lock head from retreating to the retracted position; in the brake-off state, when the second locking piece is subjected to retraction external force to enable the second lock head to retract to the retraction position, the second locking piece locks the transmission disc to prevent the transmission disc from rotating towards the brake-on direction; the button mechanism can also drive the circuit breaker to be converted into the unlocking state after the opening, namely the button mechanism drives the first locking piece, and then the first locking piece drives the first locking head and drives the second locking head to simultaneously retreat to the retraction position to be converted into the unlocking state.

Preferably, the button mechanism comprises a second locking part arranged on the first locking part and a second shrinkage-stopping part arranged on the button mechanism; the second anti-shrinkage part and the second locking part are abutted to each other in a closing state and separated from each other in an opening and unlocking state.

Preferably, the locking device comprises a first linkage abutting part arranged on the first locking part and a second linkage abutting part arranged on the second locking part, the first linkage abutting part is abutted and matched with the second linkage abutting part, and two ends of the reset spring are respectively connected with the second locking part and the shell; the second locking piece drives the first locking piece under the elastic force action of the reset spring, so that the first lock head and the second lock head are positioned at the extending positions; when the first locking piece is under the action of external force capable of overcoming the elastic force of the reset spring, the second locking piece enables the first lock head and the second lock head to retreat to the retraction position under the driving of the first locking piece.

Preferably, the locking mechanism comprises an unlocking driving part arranged on the button mechanism, an unlocking driven part and a first linkage abutting part arranged on the first locking part, and a second linkage abutting part arranged on the second locking part; the unlocking operation of the button mechanism enables the unlocking driving portion to drive the unlocking driven portion, the unlocking driven portion drives the first linkage abutting portion, the first linkage abutting portion drives the second linkage abutting portion, and the second linkage abutting portion drives the second locking piece to retreat to the retracted position.

Preferably, the first locking part is arranged on the second locking part, and the first retraction stopping part is correspondingly arranged on the transmission disc; when the driving disc rotates to the switching-on position, the first retraction-preventing part rotates to a position opposite to the first locking part of the second locking piece along with the driving disc, and the first retraction-preventing part blocks the first locking part so that the second locking piece cannot return to the retraction position.

Preferably, the locking device comprises a first locking part arranged on the second locking part and a rotation stopping part correspondingly arranged on the transmission disc; when the transmission disc rotates to the opening position, the rotation stopping part rotates to a position opposite to the first locking part along with the transmission disc; when the second locking piece retreats to the retraction position, the first locking part blocks the first retraction stopping part so that the transmission disc cannot rotate towards the closing direction.

Preferably, the first locking piece is provided with a first lock head, an unlocking driven part, a first linkage abutting part and a first rotating pair; the first locking piece is arranged in the shell through the first rotating pair, the unlocking driven part and the first lock head are respectively positioned at two ends of the first locking piece, and the first lock head and the first linkage abutting part are positioned at two sides of one end of the first locking piece; the unlocking driven part is in driving fit with the button mechanism to enable the first locking piece to unlock and rotate; the first linkage abutting part is abutted and matched with the second linkage abutting part of the second locking piece to enable the first lock head and the second lock head to be linked.

Preferably, the second locking piece is provided with a second lock head, a first locking part and a second linkage abutting part; the second locking piece rectilinear movement install in the shell, this rectilinear movement's direction perpendicular to circuit breaker's plug direction, second tapered end and first locking portion are located the both ends of second locking piece respectively, and first locking portion is located the inside one side of being close to the shell, and second linkage butt portion is located one side of second tapered end, first locking portion blocks the cooperation with the driving disc, and second linkage butt portion cooperates with the first linkage butt portion butt of first locking piece.

Preferably, the extending/retracting motion of the first lock head of the first locking member is a swing around a rotation center of the first revolute pair, and a tangent of a motion track of the swing at the extending position is perpendicular to the plugging and unplugging direction of the circuit breaker; the first rotating pair is positioned on one side of the first lock head facing the opening end B of the cabinet, so that the first rotating pair can become a hook type fulcrum of the first lock head when the first lock head is closed and pulled out.

Preferably, the second locking piece is installed in the housing through a linear sliding pair, the linear sliding pair is a sliding groove sliding block type linear sliding pair, and the sliding groove sliding block type linear sliding pair comprises a guide groove arranged on the housing and a sliding block arranged on the second locking piece; or, the linear moving pair is a cylindrical linear moving pair, and the cylindrical linear moving pair comprises a guide hole arranged on the shell and a sliding column structure arranged on the second locking piece.

Preferably, the button mechanism comprises a button member, and the unlocking driving part is arranged on the button member; in the moving process of the button piece between the switching-on position and the switching-off position, the unlocking driving part and the unlocking driven part of the first locking piece release the driving relation, so that the first locking piece is not limited by the locking driving part a; when the button piece moves to the unlocking position from the opening position, the unlocking driving part drives the unlocking driven part and enables the first locking piece to unlock and rotate.

Preferably, the button mechanism comprises a button member and an indicator member arranged in the button member and used for indicating the closing/opening state of the circuit breaker, and the unlocking driving part is arranged on the indicator member; when the button mechanism moves to the unlocking position from the opening position, the unlocking driving part on the indicating piece drives the unlocking driven part and enables the first locking piece to unlock and rotate.

Preferably, the indicating member comprises a rotating shaft a, a display end face b and an unlocking driving part arranged at one end of the rotating shaft a, the display end face b is provided with an indicating part used as a switching-on/off mark, a cavity type mounting hole is formed in the button member, an observation window communicated with the mounting hole is formed in the operation end face of the button member, the indicating member is mounted in the mounting hole of the button member through the rotating shaft a and can swing around a shaft, the swing drives the indicating part on the display end face b to move under the observation window, and the indicating part in the observation window is moved to display a corresponding switching-on/off state; the unlocking driving part is also provided with an opening indication driving surface and a closing indication driving surface which are arranged at intervals, and the unlocking driven part of the first locking piece extends between the opening indication driving surface and the closing indication driving surface; when the button pressing mechanism is used for switching on, the switching-on indication driving surface is contacted and matched with the unlocking driven part to enable the indicator to move to a switching-on position and keep in a switching-on indication state; when the pulling button mechanism is operated to open the brake, the brake-opening indicating driving surface is contacted and matched with the unlocking driven part to enable the indicating piece to move to a brake-opening position and keep in a brake-opening indicating state; and after the brake is separated, the button mechanism is continuously pulled, the brake separating indication driving surface drives the unlocking driven part and enables the first locking piece to unlock and rotate, the first locking piece drives the first lock head and drives the second lock head to simultaneously retreat to the retracted position, and the first lock head is converted into an unlocking state.

By adopting the double-lock plug-in type circuit breaker capable of preventing switching-on and plugging, the two locks, namely the first lock and the second lock, are adopted, so that the circuit breaker can be automatically prevented from being plugged into the cabinet B and also can be automatically prevented from being pulled out of the cabinet B, and the circuit breaker is prevented from switching on in the process of being plugged into the cabinet B; compared with the existing single-lock structure, the double-lock structure can also multiply the capability of resisting brute force insertion and extraction, or effectively overcome the problems of weak brute force resistance and easy deformation of the single lock by increasing the number of the locks.

In addition, the structure of the invention can be simplified, the first lock head is linked with the second lock head, the first lock head is simultaneously used for unlocking the second lock head, and the direct interaction relation is established between the opening/closing indication and the working state of the two locking pieces, so that the invention is easy to manufacture and convenient for large-scale production.

Drawings

Fig. 1 is a schematic view of an overall structure of a first embodiment of a double-tapered-end plug-in type circuit breaker capable of preventing plugging and unplugging of a switch-on, according to the present invention, wherein the circuit breaker is in a switch-on state.

Fig. 2 is a schematic diagram of the opening state of the first embodiment shown in fig. 1.

Fig. 3 is a schematic perspective view of the first embodiment shown in fig. 1, in which the circuit breaker is in an unlocked state and the transmission disc 5 is locked by the second locking member 4 in a position where it cannot rotate in a closing direction.

Fig. 4 is a schematic diagram of the overall structure of the first embodiment shown in fig. 1, in which the circuit breaker is in the process of plugging and unplugging, the first locking member 3 and the second locking member 4 are pressed by the cabinet B, and the transmission disc 5 is locked by the second locking member 4 at a position where it cannot rotate in the closing direction.

Fig. 5 is a schematic diagram of the overall structure of the first embodiment shown in fig. 1, in which the circuit breaker is in a state of being inserted into a normal position, and the circuit breaker is in a closing state, the second locking member 4 is locked by the transmission disc 5 and cannot be retracted into a retracted position, and the first locking member 3 cannot be retracted into the retracted position under the linkage control of the second locking member 4.

Fig. 6 is a partially enlarged perspective view of the embodiment of fig. 1, showing the circuit breaker in a closed state.

Fig. 7 is an enlarged partial perspective view of the embodiment of fig. 2, showing the circuit breaker in an open state.

Fig. 8 is an enlarged partial perspective view of the embodiment of fig. 3, showing the circuit breaker in an unlocked state.

Fig. 9 is an overall structural schematic diagram of a second embodiment of the unlocking driving portion of the first embodiment shown in fig. 1, which is a composite unlocking driving portion 20b provided on the indicator 22 of the button mechanism 2.

Fig. 10 is a schematic diagram of the overall structure of a second embodiment of the double-tapered-end plug-in circuit breaker capable of preventing the insertion and removal of a closing switch according to the present invention, in which a secondary anti-telescoping structure formed by a second anti-telescoping portion 24 and a second locking portion 34 is added to the circuit breaker in a closing state.

Fig. 11 is an overall configuration diagram of the second embodiment shown in fig. 10 in the open state, in which the circuit breaker is in the open state, and the second anti-shrinkage portion 24 and the second locking portion 34 of the sub-anti-shrinkage structure are separated from each other.

Fig. 12 is a perspective view illustrating an unlocked state of the second embodiment shown in fig. 10, in which the transmission disc 5 is locked by the second locking member 4 at a position where it cannot rotate in a closing direction, and the second draw back stop portion 24 and the second locking portion 34 of the sub draw back stop structure are separated from each other.

Fig. 13 is a partially enlarged perspective view of the embodiment shown in fig. 10, in which the circuit breaker is in a closed state, and the second locking portion 34 and the second locking portion 24 of the secondary anti-telescoping structure abut against each other.

Fig. 14 is a partially enlarged perspective view of the embodiment of fig. 12, showing the circuit breaker in an unlocked state with the second anti-telescoping feature of the second anti-telescoping feature 24 and the second locking feature 34 separated from each other.

Fig. 15 is a partially enlarged perspective view of a second embodiment of the unlocking driving portion of the second embodiment shown in fig. 11, which is a composite unlocking driving portion 20b provided on the indicator 22 of the button mechanism 2.

Detailed Description

The following further describes a specific embodiment of the double-lock plug-in circuit breaker capable of preventing plugging and unplugging of a closing operation, with reference to fig. 1 to 15. The double-tapered-end plug-in type circuit breaker capable of preventing the closing insertion and extraction of the invention is not limited to the description of the following embodiments.

A double-lock plug-in circuit breaker capable of preventing plugging and unplugging during closing comprises a shell 6 of the circuit breaker, a button mechanism 2, a transmission disc 5 and an operating mechanism 9, wherein the transmission disc 5 is rotatably installed in the shell 6, the button mechanism 2 is linked with the operating mechanism 9 through the transmission disc 5 and can control the circuit breaker to be switched between a closing state and an opening state, the circuit breaker further comprises a first locking piece 3 with a first lock head 31, a second locking piece 4 with a second lock head 41 and a reset spring 10, the first lock head 31 and the second lock head 41 are respectively provided with an extending position extending out of the shell 6 and a retracting position retracting into the shell 5, and the reset spring 10 drives the first lock head 31 and the second lock head 41 to simultaneously extend out of the extending positions in the closing state and the opening state; in the closing state, the transmission disc 5 locks the second locking piece 4 to prevent the first locking head 31 and the second locking head 41 from retreating to the retracted position; in the opening state, when the second locking member 4 receives a retraction external force to enable the second lock head 41 to retract to the retraction position, the second locking member 4 locks the transmission disc 5 to prevent the transmission disc 5 from rotating towards the closing direction; after the brake is separated, the button mechanism 2 can also drive the circuit breaker to be converted into an unlocking state, namely the button mechanism 2 drives the first locking piece 3, and then the first locking piece 3 drives the first locking head 31 and drives the second locking head 41 to simultaneously retract to a retraction position to be converted into the unlocking state.

By adopting the double-lock plug-in type circuit breaker capable of preventing switching-on and plugging, the two locks, namely the first lock 31 and the second lock 41, are adopted, so that the circuit breaker can be automatically prevented from being plugged into the cabinet B and also can be automatically prevented from being pulled out of the cabinet B, and the circuit breaker is prevented from switching on in the process of being plugged into the cabinet B; compared with the existing single-lock structure, the double-lock structure can also multiply the capability of resisting brute force insertion and extraction, or effectively overcome the problems of weak brute force resistance and easy deformation of the single lock by increasing the number of the locks.

Referring to the first embodiment shown in fig. 1 to 8, the double-tapered end plug-in circuit breaker capable of preventing plugging and unplugging during closing of the circuit breaker of the present invention includes a housing 6 of the circuit breaker, a button mechanism 2, a transmission disc 5 and an operating mechanism 9, wherein the transmission disc 5 is rotatably installed in the housing 6, the button mechanism 2 is linked with the operating mechanism 9 through the transmission disc 5, and the circuit breaker further includes other components such as a short-circuit protection mechanism 11, an arc extinguishing device 12, an outgoing line connecting device 13, an overload protection mechanism 14, incoming line connecting devices 1a and 1b, etc. which are included in the circuit breaker.

One beneficial feature of the invention is that: the locking mechanism further comprises a first locking piece 3 with a first locking head 31, a second locking piece 4 with a second locking head 41, a return spring 10, and a first linkage mechanism, a second linkage mechanism, an elastic driving structure, an unlocking structure, a retraction stopping structure and a rotation stopping structure which are constructed on the related parts. The above-described mechanism and structure will be specifically described one by one with reference to the accompanying drawings.

The first linkage mechanism can control the button mechanism 2 to be linked with the transmission disc 5, so as to drive the transmission disc 5 to be linked with the operating mechanism 9, and can also control the button mechanism 2 to realize switching between a closing state and an opening state, wherein one preferable structure of the first linkage mechanism is shown in figures 1-3: the first linkage mechanism comprises a linkage rod 7 and a connecting rod 8, two ends of the linkage rod 7 are rotatably hinged with the button mechanism 2 and the transmission disc 5 respectively, and two ends of the connecting rod 8 are rotatably hinged with the transmission disc 5 and the operating mechanism 9 respectively. The function of the operating mechanism 9 is well known, and it is used to control the breaking (opening) and closing (closing) of the moving contact 9a and the static contact (not shown in the figure), and the button mechanism 2 and the transmission disc 5 have closing state and opening state corresponding to the operating mechanism 9, which all belong to the prior art.

An improvement of the present invention is that, in order to make the circuit breaker easily inserted and removed, an unlocking state is additionally designed for the button mechanism 2 and the transmission plate 5, the unlocking state is converted from the opening state, and in the unlocking state, the operating mechanism 9 and the moving contact 9a thereof are still kept in the breaking state (i.e. the opening state). The circuit breaker can be switched to a closing state by pressing the button mechanism 2, the circuit breaker can be switched to an opening state by pulling the button mechanism 2, the button mechanism 2 is continuously pulled after opening, the button mechanism 2 drives the first locking piece 3, the first locking piece 3 drives the first locking head 31 and the second locking head 41 to simultaneously retract to the retraction position, and the circuit breaker is switched to an unlocking state, and at the moment, the operating mechanism 9 and the moving contact 9a thereof are still kept in a breaking state (namely, the opening state).

The second linkage mechanism of the present invention can control the first locking head 31 on the first locking member 3 to be linked with the second locking head 41 on the second locking member 4, and can simultaneously switch between the stable extended position and the retracted position through the linkage. The specific structure of the second linkage mechanism can be in various ways, and a preferable way is as shown in fig. 2 and fig. 4 to 6: the second linkage mechanism comprises a first linkage abutting part 33 arranged on the first locking part 3, a second linkage abutting part 43 arranged on the second locking part 4 and a return spring 10, wherein two ends of the return spring 10 are respectively connected with the second locking part 4 and the shell 6. The first interlocking abutting part 33 is abutted and matched with the second interlocking abutting part 43, and the second locking piece 4 drives the first locking piece 3 under the action of the elastic force of the return spring 10, so that the first locking head 31 and the second locking head 41 can be in stable extending positions when no other external force acts. As shown in fig. 2 and 7, the circuit breaker is in an open state, the transmission plate 5 is not locked by the second locking member 4 and can rotate in a closing direction, and the first locking member 3 and the second locking member 4 are maintained in the extended position by the elastic force of the spring. When the first locking member 3 is subjected to a retracting external force (a pressing force from the cabinet B as shown in fig. 4, and an unlocking operation force from the button mechanism 2 as shown in fig. 3 and 8) against the elastic force of the return spring 10, the second locking member 4 retracts the first locking head 31 and the second locking head 41 to the retracted position by the driving of the first locking member 3.

The elastic driving structure includes a spring 10 having both ends connected to the second locking member 4 and the housing 6, respectively. The elastic driving structure of the present invention can make the return spring 10 drive the first locking head 31 and the second locking head 41 to simultaneously extend to the extended position in the closing state and the opening state (see fig. 1, 2, 5, 6, and 7). Or, through the elastic driving structure, the return spring 10 can perform the control of elastically driving the first lock head 31 and the second lock head 41 to realize the constant extension, and the first lock head 31 and the second lock head 41 can be extended to the stable extension position without external force or with external force but without overcoming the elastic force of the spring. It is emphasized that the external forces mentioned above should include: the normal unlocking operating force applied to the first locking member 3 by the button mechanism 2, which has been designed to be able to overcome the elastic force of the spring 10 as a matter of course; furthermore, the pressure of the cabinet B forcing the first lock head 31 and the second lock head 41 to retract due to the abnormal opening action which may occur during the insertion and extraction process is determined by the structure and must overcome the elastic force of the spring 10. However, the cabinet B due to abnormal closing insertion and removal blocks the resistance of the first locking head 31 and the second locking head 41, and the direction of the force is designed to be perpendicular to the direction of the elastic force of the spring 10, so that the elastic force of the spring 10 cannot be overcome by the excessive abnormal insertion and removal brute force. The specific structure of the elastic driving structure can be in various manners, and a preferable manner of the elastic driving structure comprises a spring 10, two ends of which are respectively connected with the second locking piece 4 and the housing 6; the spring 10 is one of a compression spring (see fig. 6), a tension spring (not shown) or a torsion spring (not shown).

The unlocking structure of the present invention can be operated in the unlocking state as shown in fig. 3 and 8, wherein the button mechanism 2 drives the first locking member 3, and the first locking head 31 and the second locking head 41 are driven by the first locking member 3 to simultaneously retract to the retracted position. Or, in the unlocking structure, in the unlocking state, the button mechanism 2 drives the first locking member 3, and then the first locking member 3 drives the first locking head 31 and the second locking head 41 to simultaneously retract to the retracted position. The specific form of the unlocking structure is various, and a preferred form of the unlocking structure comprises an unlocking driving part 20 arranged on the button mechanism 2, an unlocking driven part 32 and a first linkage abutting part 33 arranged on the first locking part 3, and a second linkage abutting part 43 arranged on the second locking part 4; the unlocking operation of the button mechanism 2 causes the unlocking driving portion 20 to drive the unlocking passive portion 32, the unlocking passive portion 32 to drive the first linkage abutting portion 33, the first linkage abutting portion 33 to drive the second linkage abutting portion 43, and the second linkage abutting portion 43 to drive the second locking member 4 to retract to the retracted position.

Given the above description of the embodiments of the second linkage, the resilient drive structure and the unlocking structure, the following general features can be derived, which include: under the switching-on state and the switching-off state, the elastic force of the return spring 10 drives the first lock head 31 and the second lock head 41 to simultaneously extend to the extending position; in the unlocked state, the button mechanism 2 actuates the first locking member 3 and retracts the first locking head 31 and the second locking head 41 to the retracted position simultaneously. Obviously, the beneficial effects of these features are also: the positioning structure of the first lock head 31 and the second lock head 41 which are stabilized at the extending position and the retracting position can be simplified, and random displacement of relevant components caused by free gaps existing in the relevant components and factors such as external force and vibration can be effectively avoided.

As shown in fig. 5, 6 and 1, the anti-retraction structure of the present invention can lock the second locking member 4 by the transmission plate 5 in the closed state, so as to prevent the first locking head 31 and the second locking head 41 from retracting to the retracted position. Alternatively, the retraction-preventing structure can lock the second locking member 4 by the transmission plate 5 in the closed state to prevent the retraction (i.e., "retraction") of the second locking head 41, and the retraction-preventing structure can prevent the second locking head 41 from being locked by the second locking member 4 and the first locking head 31 from being interlocked with the second locking member. There are various specific forms of the anti-shrinkage structure, and a preferred form of the anti-shrinkage structure includes a first locking portion 42 provided on the second locking member 4 and a first anti-shrinkage portion 52 correspondingly provided on the transmission plate 5. When the transmission disc 5 is rotated to the on position, the first retraction stopping portion 52 rotates with the transmission disc 5 to a position opposite to the first locking portion 42 of the second locking member 4, and the first retraction stopping portion 52 stops the first locking portion 42, so that the second locking member 4 is locked not to be retracted to the retracted position.

As shown in fig. 3, 4 and 8, the rotation stopping structure of the present invention can lock the driving plate 5 by the second locking member 4 in the opening or unlocking state, so as to prevent the driving plate 5 from rotating in the closing direction. Alternatively, the rotation stopping structure can control the second locking member 4 to stop the rotation of the transmission plate 5 in the opening state (see fig. 4) or the unlocking state (see fig. 3 and 8). The rotation stopping structure has various specific forms, and a preferred mode of the rotation stopping structure comprises a first locking part 42 arranged on the second locking part 4 and a rotation stopping part 51 correspondingly arranged on the transmission plate 5. When the transmission disc 5 is rotated to the opening position, the rotation stop portion 51 rotates with the transmission disc 5 to a position opposite to the first locking portion 42, and when the second locking member 4 is retracted to the retracted position, the first locking portion 42 blocks the first retraction stop portion 52, and the transmission disc 5 is locked by the blocking so as not to rotate in the closing direction.

It will be readily appreciated that in order to stabilize both the first 31 and second 41 locking heads in the extended and retracted positions, corresponding positioning structures are required. The positioning structure can be provided in various ways, one of the simplest ways is shown in fig. 1-8: in a closing state (see fig. 1 and 6) or an opening state (see fig. 2 and 7), the housing 6 directly blocks the body of the first locking part 3, the elastic force of the spring 10 is transmitted from the second locking part 4 to the first locking part 3 in sequence, and finally acts on the housing 6, and the abutting of the housing 6 and the body of the first locking part 3 enables the second lock head 41 and the first lock head 31 to be always extended and kept in a stable extending position. In the unlocking operation (see fig. 4), the elastic force of the spring 10 urging the second locking member 4 and the first locking member 3 to abut in sequence still exists, but the unlocking operation can overcome the elastic force of the spring 10, so that the first locking head 31 and the second locking head 41 can return to the retracted position, and the positioning structure is as follows: the unlocking operation force of the button mechanism 2 is transmitted from the first locking member 3 to the second locking member 4 in sequence, and finally acts on the housing 6, and the abutment of the housing 6 with the second locking member 4 retracts the second lock head 41 and the first lock head 31 to be held in the retracted position (see fig. 3, 4, and 8). Obviously, the embodiment has the advantages of simple structure, easiness in large-scale automatic production, no need of additionally increasing the processing cost and the like.

In summary, another advantageous feature of the present invention is that, since the second linkage mechanism, the unlocking mechanism, the rotation stopping mechanism and the rotation stopping mechanism are directly built on the first locking member, the second locking member 4 and/or the transmission plate 5, the number of the locking heads is increased, and meanwhile, the structure is greatly simplified, the number of parts is reduced, and compared with the existing small circuit breaker with a single locking head having no rotation stopping function, the present invention omits a fastening mechanism. In addition, after the second linkage mechanism, the unlocking structure, the shrinkage stopping structure and the rotation stopping structure are adopted, new special functions are added to the first locking piece, the second locking piece 4 and the transmission disc 5, and the first locking piece, the second locking piece and the transmission disc are qualitatively changed in the structures of shape, connection, driving, transmission, linkage, control, matching and the like. For example: the transmission disc 5 is not only a transmission element for realizing the linkage of the button mechanism 2 and the operating mechanism 9, but also a control element for controlling the retraction stop of the second locking element 4, and is also a controlled element for controlling the rotation stop of the second locking element 4. The first locking element 3 is not only a support for the first locking head 31 but also an unlocking transmission element.

The invention has the further beneficial characteristics that the structure optimization design of the first locking piece 3, the second locking piece 4, the transmission disc 5 and the components of the button mechanism 2 is related, and the design not only aims at realizing new functions of double locking heads, preventing switch-on plugging and unplugging, unlocking and easily plugging and unplugging, stopping retraction, stopping rotation and the like, but also provides possibility for realizing product miniaturization from the aspects of simplifying and optimizing specific structures, and further improves the quality performance and the manufacturing performance of the product. In particular, the structure of the first locking member 3 can be in various forms, and a preferred scheme is as follows: the first locking piece 3 is provided with a first locking head 31, an unlocking driven part 32, a first linkage abutting part 33 and a first rotating pair 30, the first locking piece 3 is installed in the shell 6 through the first rotating pair 30, the unlocking driven part 32 and the first locking head 31 are respectively positioned at two ends of the first locking piece 3, and the first locking head 31 and the first linkage abutting part 33 are positioned at two sides of one end of the first locking piece 3; the unlocking driven part 32 is in driving fit with the button mechanism 2, and the cooperation causes the first locking piece 3 to unlock and rotate; the first interlocking abutment 33 is in abutting engagement with the second interlocking abutment 43 of the second lock 4, and this engagement causes the first lock head 31 to interlock with the second lock head 41. The structure of the second locking piece 4 can be in various forms, and a preferable scheme is as follows: the second locking piece 4 is provided with a second locking head 41, a first locking part 42, a second linkage abutting part 43 and a linear moving pair 40, the second locking piece 4 is installed in the shell 6 in a linear moving mode, the linear moving direction is perpendicular to the plugging direction A of the circuit breaker, the second locking head 41 and the first locking part 42 are respectively located at two ends of the second locking piece 4, the first locking part 42 is located on one side close to the inside of the shell 6, the second linkage abutting part 43 is located on one side of the second locking head 41, the second locking piece 4 is installed in the shell 6 through the linear moving pair 40, the first locking part 42 is in blocking fit with the transmission disc 5, and the second linkage abutting part 43 is in abutting fit with the first linkage abutting part 33 of the first locking piece 3. The structure of the transmission disc 5 can be in various forms, and a preferable scheme is as follows: the transmission disc 5 is provided with a rotation stopping part 51, a first retraction stopping part 52 and a second revolute pair 50, and the transmission disc 5 is arranged in the shell 6 through the second revolute pair; the rotation stop portion 51 faces the first locking portion 42 of the second locking member 4 in the opening state, and when the second lock cylinder 41 retracts, the rotation stop portion 51 is blocked by the first locking portion 42 and locked, which makes the transmission disc 5 unable to move in the closing direction. The first anti-retraction portion 52 cooperates with the first locking portion 42 of the second locking element 4 in the closed state to lock the second locking element 4 and the second locking head 41 from being retracted to the retracted position.

It should be understood that the reason why the existing structure for limiting the closing pull-out of the circuit breaker by using the locking boss cannot limit the brute force pull-out (the locking boss is easy to slip off when the breaker is pulled out with brute force so as to disable the limitation of the locking boss) is that: the pulling force of the circuit breaker being extracted with brute force in the closing state subjects the circuit breaker to a lateral force which inevitably has an effect of causing deformation of the cabinet and/or lateral displacement of the circuit breaker and enlarges the installation gap between the cabinet and the circuit breaker case at the locking boss, which are difficult to eliminate in the structure of the sprag-type fastener of the conventional circuit breaker. In contrast, a further advantageous feature of the invention consists in the fact that the mechanical structure of the first locking element 3 and the second locking element 4, which act as support elements for the first locking head 31 and the second locking head 41, respectively, is significantly optimized. In particular, in the case of the first locking member 3, the extension/retraction movement of the first locking head 31 thereon is in the form of a swing about the center of rotation of the first revolute pair 30, the tangent of the movement path of which at the extended position is perpendicular to the insertion/extraction direction a of the circuit breaker. The first rotating pair 30 is located on the side of the first lock head 31 facing the cabinet opening end B1, so that the first rotating pair 30 can be a hook-type fulcrum of the first lock head 31 when the door is closed and pulled out. The advantage of this design is that, since the tangent of the motion trajectory of the swing at the extended position is perpendicular to the plugging and unplugging direction a of the circuit breaker, that is, the swing direction of the first lock head 31 at the extended position is perpendicular to the plugging and unplugging direction a of the circuit breaker, the direction of the external force acting on the first lock head 31 by the cabinet B due to the plugging and unplugging force of the circuit breaker in the closing state is parallel to the plugging and unplugging direction a, that is, the component force of the external force applied to the first lock head 31 in the direction perpendicular to the plugging and unplugging direction a (referred to as transverse direction for short) tends to zero. Another advantage of this design is that since the first rotating pair 30 can become a hook-type fulcrum of the first latch 31 during the closing extraction, even if the lateral component force is not zero, the pulling force for extracting the circuit breaker in the closing state reduces the installation gap between the cabinet B and the circuit breaker housing 6 at the first latch 31. In particular, in the case of the second locking member 4, the extension/retraction movement of the second locking head 41 thereon is in the form of a linear movement defined by the linear movement pair 40, the direction of which is perpendicular to the insertion/extraction direction a of the circuit breaker. The advantage of this design is that, because the direction of the linear movement of the second locking head 41 is perpendicular to the plugging and unplugging direction a of the circuit breaker, the direction of the external force acting on the second locking head 41 by the cabinet B due to the plugging and unplugging force of the circuit breaker in the closing state is perpendicular to the linear movement direction of the second locking head 41, that is, the component force of the external force on the second locking head 41 in the transverse direction is zero.

The linear motion pair 40 of the present invention can take various forms, and referring to fig. 1, a preferred embodiment of the linear motion pair 40 is a sliding slot slider type linear motion pair comprising a guide slot provided on the housing 6 and a sliding block provided on the second locking member 4. Other usable structures are of course not excluded, such as cylindrical structures, i.e.: the linear motion pair 40 is a cylindrical linear motion pair, and includes a guide hole provided in the housing 6 and a sliding column structure (not shown) provided in the second locking member 4.

As shown in fig. 1 to 8 and 9, the unlocking structure of the first embodiment of the present invention has two embodiments, wherein the first embodiment is shown in fig. 1 to 8, and the second embodiment is shown in fig. 9.

Referring to fig. 6 to 8, in a first embodiment of the unlocking structure according to the first embodiment of the present invention, the button mechanism 2 includes a button member 21, the unlocking driving portion 20 is provided on the button member 21, the unlocking driving portion 20 is in the form of a single unlocking driving portion 20a provided on the button member 21, and the single unlocking driving portion 20a functions only as an unlocking driving; in the moving process of the button member 21 between the switching-on position and the switching-off position, the unlocking driving part 20 and the unlocking driven part 32 on the first locking member 3 are in driving-releasing relation, so that the first locking member 3 is not limited by the single unlocking driving part 20 a; during the movement of the button member 21 from the open position to the unlock position, the single unlock driving portion 20a drives the unlock receiving portion 32 and unlocks and rotates the first lock member 3. The single unlocking driving portion 20a is an unlocking boss arranged on one side of the button member 21 close to the first locking member 3, the button member 21 is pressed to switch on the circuit breaker, the unlocking boss is not in contact with the first locking member 3, when the button member 21 is pulled to switch off the circuit breaker, the unlocking boss is not in contact with the first locking member 3 or just in contact with the first locking member, the button member 21 is continuously pulled after switching off, and the unlocking boss drives the unlocking driven portion 32 and enables the first locking member 3 to be unlocked and rotated.

As shown in fig. 9, in a second embodiment of the unlocking structure according to the first embodiment of the present invention, the button mechanism 2 includes a button member 21 and an indicator 22 disposed in the button member 21 for indicating a closing/opening state of the circuit breaker, and the unlocking driving part 20 is disposed on the indicator 22; the unlocking drive unit 20 is in the form of a composite unlocking drive unit 20b provided on an indicator 22 of the push button mechanism 2, and the composite unlocking drive unit 20b functions not only as an unlocking drive but also as an indication drive (indication switching of the drive indicator 22). During the movement of the button mechanism 2 from the opening position to the unlocking position, the unlocking driving portion 20 on the indicator 22 drives the unlocking driven portion 32 and unlocks and rotates the first locking member 3.

Specifically, as shown in fig. 9, the indicating member 22 includes a rotating shaft 22a, a display end surface 22b, and an unlocking driving portion 20 disposed at one end of the rotating shaft 22a, the unlocking driving portion 20 is a composite unlocking driving portion 20b, an indicating portion used as a switching-on/off identifier is disposed on the display end surface 22b, a cavity-type installation hole is disposed inside the button member 21, an observation window communicated with the installation hole is disposed on an operation end surface of the button member 21, the indicating member 22 is mounted in the installation hole of the button member 21 through the rotating shaft 22a and can swing around a shaft, the swing drives the indicating portion on the display end surface 22b to move under the observation window, and the indicating portion moved into the observation window displays a corresponding switching-on/off state.

The indicator 22 is also a moving element, and it also has a driving structure to switch between the closing position and the opening position, and the driving structure can be constructed in various ways, among which: one is constructed between an indicator 22 and a shell 6, the indicator 22 is provided with an indicating driving part, the indicating driving part is provided with a switching-off indicating driving surface and a switching-on indicating driving surface which are arranged at intervals, the shell 6 is provided with an indicating bulge extending between the switching-off indicating driving surface and the switching-on indicating driving surface, and when the button mechanism 2 is pressed to perform switching-on operation, the switching-on indicating driving surface is contacted and matched with the indicating bulge, so that the indicator 22 is moved to a switching-on position and is kept in a switching-on indicating state; when the pulling button mechanism 2 is in opening operation, the opening indication driving surface is contacted and matched with the indication bulge, and the matching enables the indicator 22 to move to the opening position and keep in the opening indication state; the button mechanism 2 is continuously pulled after the brake is opened, the unlocking driving part 20 is a driving boss arranged on the indicator, the unlocking driving part 20 drives the unlocking driven part 32 and enables the first locking part 3 to unlock and rotate, the first locking part 3 drives the first locking head 31 and drives the second locking head 41 to simultaneously retract to the retracted position, and the unlocking state is converted.

Another way of constructing the indicator 22 driving structure is to construct between the indicator 22 and the first locking member 3. The indicator 22 comprises a rotating shaft 22a, a display end surface 22b arranged on the rotating shaft 22a and a driving structure constructed between the indicator 22 and the first locking part 3, and the indicator 22 and the first locking part 3 can establish a corresponding action position relationship through the driving structure. The action position relationship is as follows: when the first locking member 3 is in the on position, the indicator 22 is also in the on position; when the first locking member 3 is in the opening position, the indicator 22 is also in the opening position; the indicator 22 also maintains or displays the opening indication when the first locking member 3 is in the unlocked position. Here, "holding or displaying the opening indication" may include: the indicator 22 remains stationary, i.e. remains in the opening position, during the unlocking action of the first locking member 3; during the unlocking action of the first locking member 3, the indicator 22 follows, but the display end face 22b is not moved out of the display window of the opening indication, i.e. the opening indication is still displayed.

A preferred way of constructing the specific structure of the driving structure between the indicator 22 and the first locking member 3 is to construct on the unlocking driving portion 20, i.e. the composite unlocking driving portion 20 b:

the unlocking driving part 20 is also provided with an opening indication driving surface and a closing indication driving surface which are arranged at intervals, and the unlocking driven part 32 of the first locking part 3 extends between the opening indication driving surface and the closing indication driving surface; when the push button mechanism 2 is operated to close, the closing instruction driving surface is in contact engagement with the unlock receiving portion 32, and the engagement causes the indicator 22 to move to the closing position and to be maintained in the closing instruction state; when the pulling button mechanism 2 is in opening operation, the opening indication driving surface is contacted and matched with the unlocking driven part 32, and the matching enables the indicator 22 to move to the opening position and keep in the opening indication state; after the brake is opened, the button mechanism 2 is continuously pulled, the brake opening indication driving surface drives the unlocking driven part 32 and enables the first locking piece 3 to unlock and rotate, the first locking head 31 is driven by the first locking piece 3 and the second locking head 41 is driven to simultaneously retract to the retracted position, and the state is converted to the unlocking state. The beneficial characteristics of this kind of structural style lie in: the structure is simplified, the manufacture is easy, the mass production is convenient, and simultaneously, the direct interaction relationship between the opening/closing indication and the working state of the locking pieces 3 and 4 is established.

Referring to fig. 10 to 15, a second embodiment of the double-tapered-end plug-in circuit breaker capable of preventing insertion and removal of a closing switch according to the present invention is different from the first embodiment in that the second embodiment further includes a secondary anti-shrinkage structure to further improve the reliability of locking.

A second embodiment of the invention, illustrated with reference to fig. 10 to 14, has a general structure substantially identical to that of the first embodiment illustrated in fig. 1 to 8, and is characterized in that said double-tapered plug-in circuit breaker further comprises a secondary anti-telescoping structure comprising a second locking portion 34 provided on the first locking member 3, and a second anti-telescoping portion 24 provided on the push-button mechanism 2. In a closed state, the second anti-shrinkage portion 24 abuts against the second locking portion 34 (see fig. 10 and 13), at this time, the second locking member 4 is locked by the transmission disc 5 and cannot be retracted to the retracted position, the first locking member 3 cannot be retracted to the retracted position under the linkage control of the second locking member 4, and the second anti-shrinkage portion 24 of the secondary anti-shrinkage structure abuts against the second locking portion 34, so that the first locking member 3 cannot be retracted to the retracted position. Referring to fig. 11, in the opening state, the transmission disc 5 is not locked by the second locking member 4 and can rotate in the closing direction, the first locking member 3 and the second locking member 4 are held at the extended position by the elastic force of the spring 10, and the second locking portion 34 and the second locking portion 24 of the secondary anti-telescoping structure are in the separated state. That is, in the open state, the second shrinkage stop portion 24 is separated from the second locking portion 34, and in the unlocked state, the second shrinkage stop portion 24 is still separated from the second locking portion 34 (see fig. 12 and 14).

Compared with the first embodiment shown in fig. 1 to 8, the second embodiment shown in fig. 10 to 14 is further different in that the secondary anti-shrinkage structure of the second embodiment is the first locking member 3, and the load of the anti-shrinkage structure on the second locking member 4 can be reduced through the secondary anti-shrinkage structure, so as to further improve the capability of resisting brute force insertion and extraction. It is noted that due to the second linkage, the first locking member 3 still has the anti-telescoping function without the secondary anti-telescoping structure, but this function is provided by the anti-telescoping structure on the second locking member 4.

In fig. 10 to 14, the unlocking structure is disposed on the button member 21, and fig. 15 is a second embodiment of the unlocking structure according to the second embodiment of the present invention, which is similar to fig. 9 in that the unlocking driving portion 20 is disposed on the indicator member 22, and the description thereof is omitted.

With reference to fig. 1 to fig. 15, how the double-tapered end plug-in circuit breaker capable of preventing switching-on insertion and extraction of the present invention is matched with the cabinet B to form a structure for preventing switching-on insertion and extraction is further described, wherein the structure includes a switching-on insertion preventing structure, a switching-on extraction preventing structure, and a switching-on preventing structure during insertion and extraction.

The closing and inserting stop structure is as follows: when the circuit breaker is in a closing state and is not yet inserted and installed, the first locking head 31 of the first locking member 3 and the second locking head 41 of the second locking member 4 are simultaneously in an extended position where they cannot be retracted. As shown in fig. 1, the circuit breaker is in a closed state, the second locking member 4 is locked by the transmission disc 5 and cannot return to the retracted position, and the first locking member 3 cannot return to the retracted position under the linkage control of the second locking member 4. At this time, if the forcible insertion is performed, the first locking head 31 and the second locking head 41 simultaneously and in interference fit with the end face of the open end B1 of the cabinet B, so as to double the capability of the circuit breaker for preventing the insertion of the brute force closing.

The closing and pulling-out preventing structure is as follows: when the circuit breaker is inserted and installed in place and is in a closing state, the first locking head 31 of the first locking member 3 and the second locking head 41 of the second locking member 4 are simultaneously in an extended position where they cannot be retracted. At this time, if the breaker is forcibly pulled out, the first lock head 31 and the second lock head 41 are simultaneously in interference fit with the wall surface of the limiting hole B0 of the cabinet B, so that the capability of the breaker for preventing the breaker from being closed and pulled out brute force is multiplied.

The structure of the switching-on and switching-off in the plugging process is as follows: in the process of inserting or pulling out the circuit breaker, the first locking head 31 of the first locking part 3 and the second locking head 41 of the second locking part 4 are simultaneously pressed at the retraction position which can not be extended by the cabinet B, and two pressing forces respectively acting on the first locking head 31 and the second locking head 41 by the cabinet B can simultaneously control the transmission disc 5 to be incapable of rotating towards the closing direction.

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

Claims (10)

1. The utility model provides a can prevent plug-in circuit breaker of double lock head of combined floodgate plug, includes shell (6) of circuit breaker, button mechanism (2), driving plate (5) and operating device (9), and driving plate (5) are rotated and are installed in shell (6), and button mechanism (2) are through driving plate (5) and operating device (9) linkage, can control the circuit breaker and change its characterized in that between combined floodgate state and separating brake state:

the locking mechanism further comprises a first locking piece (3) with a first locking head (31), a second locking piece (4) with a second locking head (41) and a return spring (10), wherein the first locking head (31) and the second locking head (41) are respectively provided with an extending position extending out of the shell (6) and a retracting position retracting into the shell (5), and the return spring (10) drives the first locking head (31) and the second locking head (41) to extend out of the extending positions of the first locking head and the second locking head simultaneously in a closing state and a separating state;

in a closing state, the transmission disc (5) locks the second locking piece (4) to prevent the first locking head (31) and the second locking head (41) from returning to a retraction position; in the opening state, when the second locking piece (4) is subjected to retraction external force to enable the second lock head (41) to retract to the retraction position, the second locking piece (4) locks the transmission disc (5) to prevent the transmission disc (5) from rotating towards the closing direction; the switch-off rear button mechanism (2) can also drive the circuit breaker to be switched to an unlocking state, namely the button mechanism (2) drives the first locking piece (3), and then the first locking piece (3) drives the first locking head (31) and drives the second locking head (41) to simultaneously retract to a retraction position to be switched to the unlocking state.

2. The double-lock plug-in circuit breaker capable of preventing switching-on and plugging-off according to claim 1, characterized in that: comprises a second locking part (34) arranged on the first locking part (3) and a second shrinkage-stopping part (24) arranged on the button mechanism (2); the second anti-shrinkage part (24) and the second locking part (34) are in contact with each other in a closing state and are separated from each other in an opening and unlocking state.

3. The double-lock plug-in circuit breaker capable of preventing switching-on and plugging-off according to claim 1, characterized in that: the locking device comprises a first linkage abutting part (33) arranged on a first locking part (3) and a second linkage abutting part (43) arranged on a second locking part (4), wherein the first linkage abutting part (33) is abutted and matched with the second linkage abutting part (43), and two ends of a reset spring (10) are respectively connected with the second locking part (4) and a shell (6); the second locking piece (4) drives the first locking piece (3) under the action of the elastic force of the return spring (10) to enable the first lock head (31) and the second lock head (41) to be in the extending position; when the first locking piece (3) is acted by external force which can overcome the elastic force of the return spring (10), the second locking piece (4) enables the first locking head (31) and the second locking head (41) to retreat to the retraction position under the driving of the first locking piece (3).

4. The double-lock plug-in circuit breaker capable of preventing switching-on and plugging-off according to claim 1, characterized in that: the unlocking mechanism comprises an unlocking driving part (20) arranged on a button mechanism (2), an unlocking driven part (32) and a first linkage abutting part (33) which are arranged on a first locking piece (3), and a second linkage abutting part (43) which is arranged on a second locking piece (4); the unlocking operation of the button mechanism (2) enables the unlocking driving portion (20) to drive the unlocking driven portion (32), the unlocking driven portion (32) drives the first linkage abutting portion (33), the first linkage abutting portion (33) drives the second linkage abutting portion (43), and the second linkage abutting portion (43) drives the second locking piece (4) to return to the retraction position.

5. The double-lock plug-in circuit breaker capable of preventing switching-on and plugging-off according to claim 1, characterized in that: comprises a first locking part (42) arranged on the second locking part (4) and a first shrinkage-stopping part (52) correspondingly arranged on the transmission disc (5); when the transmission disc (5) rotates to the switching-on position, the first retraction-preventing part (52) rotates to a position opposite to the first locking part (42) of the second locking piece (4) along with the transmission disc (5), and the first retraction-preventing part (52) blocks the first locking part (42) so that the second locking piece (4) cannot return to the retraction position.

6. The double-lock plug-in circuit breaker capable of preventing switching-on and plugging-off according to claim 1, characterized in that: comprises a first locking part (42) arranged on the second locking part (4) and a rotation stopping part (51) correspondingly arranged on the transmission disc (5); when the transmission disc (5) rotates to the opening position, the rotation stopping part (51) rotates to a position opposite to the first locking part (42) along with the transmission disc (5); when the second locking member (4) retracts to the retracted position, the first locking part (42) blocks the first retraction stopping part (52) so that the transmission disc (5) cannot rotate in the closing direction.

7. The double-lock plug-in circuit breaker capable of preventing switching-on and plugging-off according to claim 1, characterized in that: the first locking piece (3) is provided with a first lock head (31), an unlocking driven part (32), a first linkage abutting part (33) and a first rotating pair (30); the first locking piece (3) is installed in the shell (6) through the first rotating pair (30), the unlocking driven part (32) and the first lock head (31) are respectively located at two ends of the first locking piece (3), and the first lock head (31) and the first linkage abutting part (33) are located at two sides of one end of the first locking piece (3); the unlocking driven part (32) is in driving fit with the button mechanism (2) to enable the first locking part (3) to unlock and rotate; the first linkage abutting part (33) is abutted and matched with the second linkage abutting part (43) of the second locking piece (4) so that the first locking head (31) is linked with the second locking head (41).

8. The double-lock plug-in circuit breaker capable of preventing switching-on and plugging-off according to claim 1, characterized in that: the second locking piece (4) is provided with a second lock head (41), a first locking part (42) and a second linkage abutting part (43); second locking piece (4) rectilinear movement install in shell (6), the direction of this rectilinear movement is perpendicular to the plug direction of circuit breaker, second tapered end (41) and first locking portion (42) are located the both ends of second locking piece (4) respectively, first locking portion (42) are located the inside one side of being close to shell (6), second linkage butt portion (43) are located one side of second tapered end (41), first locking portion (42) block cooperation with driving disc (5), second linkage butt portion (43) and the first linkage butt portion (33) butt cooperation of first locking piece (3).

9. The double-lock plug-in circuit breaker capable of preventing switching-on and plugging-in of claim 7, characterized in that: the extending/retracting movement of the first lock head (31) of the first locking piece (3) is in a mode of swinging around the rotating center of the first rotating pair (30) of the first locking piece, and the tangent of the moving track of the swinging at the extending position is perpendicular to the inserting and pulling direction of the circuit breaker; the first rotating pair (30) is positioned on one side of the first lock head (31) facing the opening end B (1) of the cabinet, so that the first rotating pair (30) can be used as a hook type fulcrum of the first lock head (31) when the switch is closed and pulled out.

10. The double-lock plug-in circuit breaker capable of preventing switching-on and plugging-in of claim 8, characterized in that: the second locking piece (4) is installed in the shell (6) through a linear moving pair (40), the linear moving pair (40) is a sliding groove sliding block type linear moving pair, and the sliding groove sliding block type linear moving pair comprises a guide groove arranged on the shell (6) and a sliding block arranged on the second locking piece (4); or the linear moving pair (40) is a cylindrical linear moving pair, and the cylindrical linear moving pair comprises a guide hole arranged on the shell (6) and a sliding column structure arranged on the second locking piece (4);

the button mechanism (2) comprises a button piece (21), and the unlocking driving part (20) is arranged on the button piece (21); in the moving process of the button member (21) between the switching-on position and the switching-off position, the unlocking driving part (20) and the unlocking driven part (32) of the first locking member (3) are released from the driving relation, so that the first locking member (3) is not limited by the locking driving part (20 a); when the button piece (21) moves to the unlocking position from the opening position, the unlocking driving part (20) drives the unlocking driven part (32) and enables the first locking piece (33) to unlock and rotate;

the button mechanism (2) comprises a button piece (21) and an indicator piece (22) which is arranged in the button piece (21) and used for indicating the closing/opening state of the circuit breaker, and the unlocking driving part (20) is arranged on the indicator piece (22); in the process that the button mechanism (2) moves to the unlocking position from the opening position, an unlocking driving part (20) on the indicating piece (22) drives the unlocking driven part (32) and enables the first locking piece (33) to unlock and rotate;

the indicating piece (22) comprises a rotating shaft (22a), a display end surface (22b) and an unlocking driving part (20) arranged at one end of the rotating shaft (22a), the display end surface (22b) is provided with an indicating part used as a switching-on/off mark, a cavity type mounting hole is formed in the button piece (21), an observation window communicated with the mounting hole is formed in the operation end surface of the button piece (21), the indicating piece (22) is mounted in the mounting hole of the button piece (21) through the rotating shaft (22a) and can swing around a shaft, the swinging drives the indicating part on the display end surface (22b) to move under the observation window, and the corresponding switching-on/off state is displayed through the indicating part moving into the observation window;

the unlocking driving part (20) is also provided with an opening indication driving surface and a closing indication driving surface which are arranged at intervals, and the unlocking driven part (32) of the first locking part (33) extends between the opening indication driving surface and the closing indication driving surface; when the push button mechanism (2) is pressed to perform closing operation, the closing indication driving surface is contacted and matched with the unlocking driven part (32) to move the indicator (22) to a closing position and keep a closing indication state; when the pulling button mechanism (2) is operated to open the brake, the brake-opening indication driving surface is contacted and matched with the unlocking driven part (32) to move the indicator (22) to the brake-opening position and keep the indicator in the brake-opening indication state; and after the brake is separated, the button mechanism (2) is continuously pulled, the brake separation indication driving surface drives the unlocking driven part (32) and enables the first locking piece (33) to unlock and rotate, the first locking piece (3) drives the first locking head (31) and drives the second locking head (41) to simultaneously retract to the retraction position, and the unlocking state is converted.

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