CN217182123U - Opening operation mechanism of circuit breaker and circuit breaker - Google Patents

Abstract

The utility model relates to a separating brake operating device and circuit breaker of circuit breaker, this separating brake operating device includes the dropout semi-axis, the separating brake pawl, elastic holding member and two sets at least tripping bracket subassemblies, set up the overlap joint inclined plane on the dropout semi-axis, the separable overlap joint of separating brake pawl and overlap joint inclined plane to realize separating brake operating device's combined floodgate and separating brake, elastic holding member is used for providing and makes the separating brake pawl keep the elastic force with overlap joint inclined plane overlap joint, every set of tripping bracket subassembly includes separating brake electro-magnet and support, the dropout semi-axis is installed on the support, separating brake electro-magnet and support interval arrangement, the movable iron core of separating brake electro-magnet sets up to be can drive the support and rotate, and drive the tripping semi-axis and rotate around self axis, so that tripping semi-axis and separating brake pawl separate. Therefore, when the opening coil on one opening electromagnet is burnt out and cannot work normally, the other opening electromagnet can be adopted to drive the bracket and the tripping half shaft to rotate, and the opening reliability of the opening operation mechanism is improved.

Description

Opening operation mechanism of circuit breaker and circuit breaker

Technical Field

The utility model relates to a circuit breaker technical field specifically relates to a separating brake operating device and circuit breaker of circuit breaker.

Background

The circuit breaker bears working voltage and load current when working normally, and cuts off short-circuit current when short-circuit occurs, so that the failure probability is increased when frequent operation, complex operation conditions and improper management of manufacturing, mounting, maintaining and maintaining links are carried out. Once the breaker can not make the separating brake operating mechanism timely separate brake and cut off fault points, short circuit grounding current can make the breaker generate override tripping, leading to the interruption of a previous-stage power supply, causing serious threat to the safe operation of a unit and a power grid, and having hidden trouble of unit shutdown.

In current circuit breaker (like 6kV circuit breaker), if the separating brake coil skeleton warp, move the iron core motion and be obstructed, the improper or screw of push pedal installation angle is not hard up, maintains the improper scheduling problem of maintenance, current that the separating brake coil flowed through increases at double when probably leading to the separating brake, makes the separating brake coil burn out. Sometimes, the auxiliary contact of the circuit breaker is improperly adjusted, and the direct current electric arc is not switched on, so that the power-on time of the opening coil is too long, and the opening coil can be burnt. Because the opening coil is burnt out, the opening mechanism of the circuit breaker fails (opening refuses), and the circuit breaker can not work normally.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a separating brake operating device and circuit breaker of circuit breaker, separating brake operating device can promote the reliability of circuit breaker separating brake, is favorable to guaranteeing the normal work of circuit breaker.

In order to achieve the above object, the present disclosure provides an opening operation mechanism of a circuit breaker, including a tripping half shaft, an opening latch, an elastic retaining member, and at least two sets of tripping bracket assemblies, where the tripping half shaft is provided with a lapping slope, the opening latch is detachably lapped on the lapping slope, the elastic retaining member is used to provide an elastic force for keeping the opening latch lapped on the lapping slope, each set of tripping bracket assembly includes a tripping electromagnet and a bracket, the tripping half shaft is mounted on the bracket, the tripping electromagnet is spaced from the bracket, and a movable iron core of the tripping electromagnet is configured to be able to drive the bracket to rotate and drive the tripping half shaft to rotate around its axial lead, so as to separate the tripping half shaft from the opening latch.

Optionally, the opening operating mechanism has two sets of the tripping support assemblies, and the two sets of the tripping support assemblies are arranged at intervals along the axial direction of the tripping half shaft.

Optionally, two first mounting holes are formed in the tripping half shaft, the two first mounting holes are arranged along the axial direction of the tripping half shaft at intervals, each first mounting hole is formed in the support, the tripping support assembly further comprises a first fastener, and one end of the first fastener penetrates through the second mounting hole and is fixed in the corresponding first mounting hole.

Optionally, the center lines of the two first mounting holes and the shaft axis of the tripping half shaft are located on the same horizontal plane.

Optionally, the bracket includes a first plate and a second plate connected to form an L shape, a surface of the first plate, which is away from the second plate, is used for abutting against and matching with a movable iron core of the opening electromagnet, and a surface of the second plate, which is away from the first plate, is connected to the trip half shaft.

Optionally, the trip bracket assembly further comprises an adjusting member, the adjusting member is movably mounted on a fixed plate of the circuit breaker along the axial direction of the adjusting member, and one end of the adjusting member is used for being in abutting fit with a surface, close to the first plate, of the second plate, so that the angle of the bracket relative to the fixed plate is adjusted through the movement of the adjusting member along the axial direction of the adjusting member, and therefore the buckling amount between the lapping inclined surface and the separating brake is adjusted.

Optionally, the adjusting member is an adjusting screw, and the adjusting screw is inserted into a screw hole formed in the fixing plate.

Optionally, the elastic retaining member comprises a torsion spring, the torsion spring is sleeved on the separating brake pawl, one end of the torsion spring is connected to the outer wall of the separating brake pawl, and the other end of the torsion spring is connected to the fixing portion for hinging the separating brake pawl.

Optionally, the tripping operation mechanism has two sets of tripping bracket assemblies, the tripping coils of the tripping electromagnets in the tripping bracket assemblies are connected in series, and a protection pressing plate is arranged on a series circuit between the two tripping coils and used for selectively connecting or disconnecting the series circuit.

According to another aspect of the present disclosure, a circuit breaker is provided, which includes the opening operation mechanism.

In the opening operating mechanism provided by the disclosure, at least two sets of tripping bracket assemblies are arranged, each set of tripping bracket assembly can drive the tripping half shaft to rotate, and the separation of the tripping half shaft and the opening pawl can be realized, so that the unlocking of the opening pawl is realized. When the circuit needs to be disconnected by using the hollow circuit breaker, if the opening coil on one of the opening electromagnets is burnt out and cannot work normally, the other opening electromagnet can be adopted to drive the bracket and the tripping half shaft to rotate. Therefore, the reliability of the opening operating mechanism is improved, the failure of opening operation is avoided, the reliable tripping and opening of the circuit breaker are facilitated, and the override trip accident of the circuit breaker is avoided.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a schematic side view of an opening operating mechanism according to an embodiment of the present disclosure;

FIG. 2 is a schematic top view of a portion of the structure of an embodiment of the opening operating mechanism of the present disclosure, wherein the opening pawl is not shown and the trip bracket assembly only shows the bracket;

fig. 3 is a schematic perspective view of a partial structure of a switching-off operation mechanism according to an embodiment of the present disclosure, in which a switching-off pawl, a switching-off electromagnet, and the like are not shown;

fig. 4 is an electrical connection circuit of the opening coil of the opening operating mechanism according to an embodiment of the present disclosure, wherein the electrical connection circuit of only one opening coil is shown.

Description of the reference numerals

10-tripping half shaft; 11-lap bevel; 12-a first mounting hole; 13-axis line; 20-a separating brake latch; 30-trip bracket assembly; 31-opening electromagnet; 311-a plunger; 312-a switching-off coil; 32-a scaffold; 321-a first plate; 322-a second plate; 323-second mounting hole; 33-a first fastener; 34-an adjustment member; 40-fixing the plate; 50-a second fastener; 60-manual brake separating pin; 70-protective press plate.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless stated to the contrary, the terms of orientation such as "upper and lower" are used to define the square of the drawing in the drawings, and refer specifically to the direction of the drawing in fig. 1. In addition, the terms "first", "second", and the like used in the embodiments of the present disclosure are for distinguishing one element from another, and have no order or importance.

As shown in fig. 1 to 4, the present disclosure provides an opening operation mechanism of a circuit breaker. The opening operation mechanism can comprise a tripping half shaft 10, an opening latch 20, an elastic holding piece (not shown) and at least two sets of tripping bracket assemblies 30, wherein the tripping half shaft 10 is provided with a lapping structure which is detachably connected with the opening latch 20 to realize the closing and opening of the opening operation mechanism, thereby realizing the opening and closing of the hollow circuit breaker. The elastic retaining member is used for providing an elastic force for keeping the opening catch 20 in lap joint with the lap joint structure, each set of tripping bracket assembly 30 comprises an opening electromagnet 31 and a bracket 32, the tripping half shaft 10 is installed on the bracket 32, the opening electromagnet 31 and the bracket 32 are arranged at intervals, a movable iron core 311 of the opening electromagnet 31 is set to be capable of driving the bracket 32 to rotate around the axial lead 13 of the half shaft and driving the tripping half shaft 10 to rotate around the own axial lead 13, so that the elastic force of the elastic retaining member is overcome, and the tripping half shaft 10 is separated from the opening catch 20. Wherein one end of the opening latch 20 is hinged to other parts of the circuit breaker, for example, to the link plate transmission system, and the other end of the opening latch 20 is overlapped with the overlapping inclined plane 11 of the tripping half shaft 10.

During operation, after the circuit breaker is switched on, under the action of the elastic retaining piece, the opening catch 20 is locked on the tripping half shaft 10, when the circuit breaker is switched off or tripped in an overcurrent mode, the iron coil of the opening electromagnet 31 is electrified, the movable iron core 311 impacts the support 32, the support 32 enables the tripping half shaft 10 to obtain a clockwise torque, the tripping half shaft 10 rotates clockwise for a certain angle, the opening catch 20 is unlocked with the tripping half shaft 10, and the main auxiliary switch contact is pulled by the transmission connecting plate of the connecting plate transmission system to complete breaking operation.

In the opening operating mechanism provided by the present disclosure, at least two sets of the trip bracket 32 assemblies are provided, and each set of the trip bracket assembly 30 can drive the trip half shaft 10 to rotate, so that the separation of the trip half shaft 10 and the opening pawl 20 can be realized, and the unlocking of the opening pawl 20 can be realized. When the circuit is required to be broken by using the hollow circuit breaker, if the opening coil 312 on one of the opening electromagnets 31 is burnt out and cannot work normally, the other opening electromagnet 31 can be used for driving the bracket 32 and the tripping half shaft 10 to rotate. Therefore, the reliability of the opening operating mechanism is improved, the failure of opening operation is avoided, the reliable tripping and opening of the circuit breaker are facilitated, and the override trip accident of the circuit breaker is avoided. Moreover, through setting up many sets of dropout bracket component 30, be favorable to improving circuit breaker separating brake action reliability, need not to do great improvement to other structures of separating brake operating device, economy, practicality, also can not make separating brake operating device's structure too complicated.

The number of trip bracket assemblies 30 is not limited by the present disclosure, and alternatively, as shown in fig. 1 and 2, in one embodiment of the present disclosure, the opening operating mechanism may have two sets of trip bracket assemblies 30, with the two sets of trip bracket assemblies 30 being spaced apart axially along the trip half shaft 10. The two sets of tripping bracket assemblies 30 are arranged, so that the reliability of the opening operating mechanism is improved, the number of the tripping bracket assemblies 30 can be saved, the structure of the opening operating mechanism is not complicated, and in addition, the two sets of tripping bracket assemblies 30 are respectively arranged along the axial direction of the tripping half shaft 10 at intervals, so that the tripping bracket assemblies 30 are convenient to arrange.

It will be appreciated that in other embodiments of the present disclosure, not shown, the number of trip bracket assemblies 30 can be other than two sets, e.g., the number of trip bracket assemblies 30 can be three, four, etc. At this time, a plurality of sets of trip bracket assemblies 30 can also be arranged at intervals along the axial direction of the trip half shaft 10.

In the present disclosure, the connection between the bracket 32 and the trip half shaft 10 may be in any suitable manner. Alternatively, as shown in fig. 1 and 2, in one embodiment of the present disclosure, two first mounting holes 12 are provided on the trip half shaft 10, the two first mounting holes 12 are spaced apart along the axial direction of the trip half shaft 10, a second mounting hole 323 is provided on each bracket 32, and the trip bracket assembly 30 further includes a first fastening member 33, and one end of the fastening member passes through the second mounting hole 323 and is fixed in the corresponding first mounting hole 12. Therefore, the tripping half shaft 10 and the bracket 32 can be connected into a whole by adopting a fastener, the installation is reliable, and the structure is simple.

Optionally, in other embodiments of the present disclosure, the bracket 32 and the trip half shaft 10 may be welded or clamped, which is not limited by the present disclosure.

Alternatively, as shown in fig. 1, in one embodiment of the present disclosure, the center lines of the two first mounting holes 12 and the shaft axis 13 of the trip half shaft 10 are located on the same horizontal plane. The advantages of such an arrangement are: on one hand, the first mounting hole 12 is located at the position where the size of the tripping half shaft 10 is the largest, so that the first mounting hole 12 is conveniently formed in the tripping half shaft 10; on the other hand, the mounting positions of the brackets 32 of the two sets of trip bracket assemblies 30 are at the same height as the axial lead 13 of the trip half shaft 10, which is beneficial to ensuring that the rotation amount of the two sets of trip bracket assemblies 30 to the trip half shaft 10 is the same and the adjustment effect is the same, so that the same separation effect can be ensured when any set of trip bracket assembly 30 is used for driving the trip half shaft 10 to separate from the separating brake latch 20.

The present disclosure is not limited to a particular shape of the bracket 32. Alternatively, as shown in fig. 1 to 3, in an embodiment of the present disclosure, the bracket 32 may include a first plate 321 and a second plate 322 connected to form an L shape, a surface of the first plate 321 away from the second plate 322 is used for abutting engagement with the plunger 311 of the opening electromagnet 31, and a surface of the second plate 322 away from the first plate 321 is connected to the trip half shaft 10. Thus, when the movable iron core 311 moves to abut against the first plate 321, the second plate 322 will drive the trip half shaft 10 to rotate, for example, referring to fig. 1, to drive the trip half shaft 10 to rotate clockwise, which is simple in structure and convenient to operate.

It should be noted that the connection angle between the first plate 321 and the second plate 322 connected in the L shape here may be just 90 degrees, or may be equal to about 90 degrees, for example, 89 degrees or 91 degrees.

To facilitate adjustment of the amount of engagement between the lapping ramp 11 on the trip half shaft 10 and the opening pawl 20. Alternatively, as shown in fig. 1 to 3, in an embodiment of the present disclosure, the trip bracket assembly 30 may further include an adjusting member 34, the adjusting member 34 is movably mounted on the fixed plate 40 along its axial direction, and one end of the adjusting member 34 is configured to be in abutting engagement with a surface of the second plate 322 away from the first plate 321, so as to adjust an angle of the bracket 32 relative to the fixed plate 40 by the adjusting member 34 moving along its axial direction, thereby adjusting a buckling amount between the overlapping structure on the trip half shaft 10 and the opening latch 20, so that the buckling amount meets a requirement. That is, in the present embodiment, by controlling the position of the adjusting member 34 on the fixing plate 40, the position of the end of the adjusting member 34 connected to the second plate 322 can be controlled, so as to adjust the rotation angle of the bracket 32 and the tripping half shaft 10, and thus, the position of the overlap ramp 11 on the tripping half shaft 10 relative to the opening latch 20 can be adjusted, so as to adjust the amount of engagement between the overlap ramp 11 and the opening latch 20.

Wherein, optionally, the adjusting member 34 may be an adjusting screw, and the adjusting screw is inserted into a screw hole provided on the fixing plate 40. The adjusting screw penetrates through the screw hole, can be screwed in or screwed out by rotating the adjusting screw, and can adjust the buckling amount of the free end of the lapping inclined plane 11 and the separating brake pawl 20, so that the operation is convenient. Furthermore, with this screwing, it is possible to achieve a precise adjustment of the distance that the adjusting screw moves along the center line of the threaded hole, and therefore, it is advantageous to precisely adjust the amount of engagement of the overlap ramp 11 with the opening catch 20.

It will be appreciated that in other embodiments of the present disclosure, for example, the adjustment member 34 may be a piston of a cylinder or a hydraulic cylinder, one end of which is connected to a cylinder body formed on the fixed plate 40.

In one embodiment of the present disclosure, as shown in fig. 3, the trip bracket assembly 30 may further include a manual tripping pin 60, the manual tripping pin 60 may be axially movably mounted on the fixed plate 40 along itself, and an end of the manual tripping pin 60 away from the operating end is used for abutting engagement with the second plate 322, and by pressing the manual tripping pin 60, the bracket 32 may be driven to rotate, thereby driving the tripping half shaft 10 to separate from the tripping pawl 20. The manual tripping pin 60 is provided, and is mainly used for manually separating the tripping half shaft 10 from the tripping latch 20 during testing.

Referring to fig. 1, in the present disclosure, the fixing plate 40 may be mounted on a side plate (not shown) of the circuit breaker by a second fastener 50.

It is understood that in the present disclosure, the lapping slope 11 may be a slope provided on the sidewall of the trip half shaft 10, that is, in the present embodiment, a portion may be cut off on the surface of the trip half shaft 10 to form a slope for the trip half shaft 10 to lap, which is simple in structure. In other embodiments of the present disclosure, the fastener structure may be specially disposed on the lap joint, and the above-mentioned lap bevel 11 may be machined on the lap joint.

In the present disclosure, the elastic holder may include a torsion spring, the torsion spring is sleeved on the opening pawl 20, and one end of the torsion spring is connected to an outer wall of the opening pawl 20, and the other end of the torsion spring is connected to a fixing portion for hinging the opening pawl 20, for example, to a link transmission system of the circuit breaker. In its initial state, the torsion spring provides for maintaining the opening pawl 20 in an overlapping position with the trip half shaft 10.

The present disclosure does not limit the material of the tripping half-shaft 10, as long as the surface strength, hardness, and wear resistance of the tripping half-shaft 10 meet the working requirements.

Alternatively, referring to fig. 4, in the embodiment where the tripping operation mechanism has two sets of tripping bracket assemblies 30, the tripping coils 312 of the electromagnets in the two sets of tripping bracket assemblies 30 can be connected in series, and a protective pressure plate 70 is disposed on the series circuit between the two tripping coils 312, and the protective pressure plate 70 is used for selectively connecting or disconnecting the series circuit. By providing the protective pressing plate 70, it is possible to easily disconnect the opening coil 312 from another coil (not shown, hereinafter referred to as a second coil) in the drawing at the time of performing a test.

Alternatively, when connected, the two trip outlets of the differential protection device CDJ and the backup protection device BHJ of the circuit breaker may be connected in series into the circuit of the opening coil 312. When the short-circuit grounding overcurrent fault occurs, the movable iron cores 311 of the two electromagnets simultaneously impact the bracket 32, so that the tripping half shaft 10 rotates clockwise, and the switching-off operation is realized. When the two electromagnets are operated simultaneously, the control loop current is relatively large, so that a small air switch of 3ZKK is additionally arranged in the control loop shown in fig. 3 to provide the opening power supply for the opening coil 312 shown in fig. 3. When overcurrent (short circuit) protection action occurs, the breaker opening coil 312 is electrified to execute opening, and when one opening coil 312 is burnt, the other opening coil 312 can ensure that the breaker can be reliably opened. In the figure, + KM and-KM are contactors for contacting with a power source.

In the disclosure, after the bracket 32 is installed and fixed, the adjusting screw 34 can be controlled, the angle of the bracket 32 is adjusted, lubricating oil is added to the rotating part of the tripping half shaft 10, so that the tripping half shaft 10 can rotate flexibly, the buckling amount of the tripping pawl 20 and the tripping half shaft 10 is checked, the requirement of the buckling amount is met, and multiple times of opening and closing tests are performed at the test position of the circuit breaker, so that the opening and closing reliability of the circuit breaker is ensured. The contact condition of the auxiliary contact 5DL connected in series with the opening coil 312 is checked, and whether the contact switching time meets the specification requirement is detected through experiments.

The rated voltage of the direct-current operating power supply of the circuit breaker is DC 110V, the operating voltage of the opening coil 312 is detected according to the regulation, the tripping mechanism reliably operates the opening when the lowest operating voltage of the opening coil 312 is between 30 percent and 65 percent of the rated voltage, and the opening of the circuit breaker is checked when the lowest operating voltage is not below 30 percent of the rated voltage.

According to another aspect of the present disclosure, there is provided a circuit breaker including the opening operation mechanism described above. Alternatively, the circuit breaker may be a vacuum circuit breaker, for example, the circuit breaker may be a 6kV vacuum circuit breaker, and particularly may be a vacuum circuit breaker that realizes opening by using a half-shaft tripping manner.

Optionally, the circuit breaker of the present disclosure may further include an energy storage element, an energy storage maintaining mechanism, a link plate transmission system, a closing maintaining device, an auxiliary switch, an indicating device, and the like. The energy storage can be completed by a power supply driving motor or manually by using an energy storage handle. After the circuit breaker is closed, under the action of the elastic retaining piece, the opening pawl 20 is locked on the tripping half shaft 10, when the circuit breaker is opened or released due to overcurrent, the iron coil of the opening electromagnet 31 is electrified, the movable iron core 311 impacts the bracket 32, the bracket 32 enables the tripping half shaft 10 to obtain a clockwise torque, the tripping half shaft 10 rotates clockwise for a certain angle, the opening pawl 20 is unlocked with the tripping half shaft 10, the transmission connecting plate of the connecting plate transmission system pulls the main and auxiliary switch contacts to complete breaking operation, in the rear stage of the opening process, the hydraulic buffer can absorb the residual energy in the opening process and limit the separation position to complete the opening action of the circuit breaker, and the closing/opening indicating plate is pulled by the connecting plate to display a 'opening' mark. Therefore, the circuit breaker can reliably store the closing energy, the circuit breaker can have enough closing energy at any time, the opening energy can also store the energy in the closing process, the energy is not influenced by external conditions, and when the opening instruction is sent out in any state, the opening coil 312 is electrified to immediately execute and complete the opening action.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. The opening operation mechanism of the circuit breaker is characterized by comprising a tripping half shaft (10), an opening latch (20), an elastic retaining piece and at least two sets of tripping bracket assemblies (30), wherein the tripping half shaft (10) is provided with an overlap inclined plane (11), and the opening latch (20) is detachably overlapped with the overlap inclined plane (11);

the elastic retaining piece is used for providing an elastic force for keeping the separating brake latch (20) overlapped with the overlapping inclined plane (11);

each set of the tripping support assembly (30) comprises a tripping electromagnet (31) and a support (32), the tripping half shaft (10) is installed on the support (32), the tripping electromagnet (31) and the support (32) are arranged at intervals, and a movable iron core (311) of the tripping electromagnet (31) is set to be capable of driving the support (32) to rotate and driving the tripping half shaft (10) to rotate around the axis (13) of the tripping half shaft, so that the tripping half shaft (10) is separated from the tripping pawl (20).

2. The opening operating mechanism according to claim 1, characterized in that it has two sets of trip bracket assemblies (30), two sets of trip bracket assemblies (30) being axially spaced along the trip half shaft (10).

3. The opening operating mechanism according to claim 2, characterized in that two first mounting holes (12) are provided on the tripping half shaft (10), the two first mounting holes (12) are arranged at intervals along the axial direction of the tripping half shaft (10), a second mounting hole (323) is provided on each bracket (32), the tripping bracket assembly (30) further comprises a first fastening member (33), and one end of the first fastening member (33) passes through the second mounting hole (323) and is fixed in the corresponding first mounting hole (12).

4. The opening operating mechanism according to claim 3, characterized in that the center lines of the two first mounting holes (12) and the axis (13) of the tripping half shaft (10) are located on the same horizontal plane.

5. The opening operating mechanism according to any one of claims 1-4, characterized in that the bracket (32) comprises a first plate (321) and a second plate (322) which are connected into an L shape, wherein the surface of the first plate (321) far away from the second plate (322) is used for abutting fit with the movable iron core (311) of the opening electromagnet (31), and the surface of the second plate (322) far away from the first plate (321) is connected with the tripping half shaft (10).

6. The opening operating mechanism according to claim 5, characterized in that the tripping bracket assembly (30) further comprises an adjusting member (34), the adjusting member (34) is movably mounted on a fixed plate (40) of the circuit breaker along the axial direction of the adjusting member, and one end of the adjusting member (34) is used for abutting engagement with a surface of the second plate (322) close to the first plate (321) so as to adjust the angle of the bracket (32) relative to the fixed plate (40) through the movement of the adjusting member (34) along the axial direction of the adjusting member, thereby adjusting the buckling amount between the lapping inclined surface (11) and the opening latch (20).

7. Opening operating mechanism according to claim 6, characterized in that the adjusting member (34) is an adjusting screw passing through a screw hole provided on the fixing plate (40).

8. Opening operating mechanism according to any one of claims 1 to 4, characterized in that the elastic retaining means comprise a torsion spring, which is arranged on the opening catch (20) and one end of which is connected to the outer wall of the opening catch (20) and the other end of which is connected to a fixing for hinging the opening catch (20).

9. The opening operating mechanism according to any one of claims 1-4, characterized in that the opening operating mechanism has two sets of tripping bracket assemblies (30), the opening coils (312) of the opening electromagnets (31) in the two sets of tripping bracket assemblies (30) are connected in series, and a protective pressure plate (70) is arranged on the series circuit between the two opening coils (312), and the protective pressure plate (70) is used for selectively connecting or disconnecting the series circuit.

10. A circuit breaker, characterized in that it comprises a opening operating mechanism according to any one of claims 1-9.

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