CN112768317A - Tripping device of low-voltage vacuum circuit breaker - Google Patents

Abstract

The invention discloses a tripping device of a low-voltage vacuum circuit breaker, which relates to the technical field of vacuum circuit breakers and comprises an electromagnet, a vacuum arc extinguish chamber and a tripping mechanism, wherein the electromagnet controls the movable contact and the fixed contact in the vacuum arc extinguish chamber to be contacted or separated so as to realize switching on and off, the tripping mechanism is arranged between the electromagnet and the vacuum arc extinguish chamber and comprises a connecting rod assembly, the connecting rod assembly has a folded state and a relatively straight state, the folded state and the relatively straight state of the connecting rod assembly respectively correspond to the tripping state and the locking state of the tripping mechanism, and when an overload or short-circuit fault occurs in a circuit, the connecting rod assembly timely responds to the situation that the relatively straight state is switched into the folded state so as. The tripping device of the low-voltage vacuum circuit breaker can cut off a fault circuit in time, realize a protection function, send out a fault alarm signal after tripping, inform a user of timely maintenance and prevent further expansion of accidents.

Description

Tripping device of low-voltage vacuum circuit breaker

Technical Field

The invention relates to the technical field of vacuum circuit breakers, in particular to a tripping device of a low-voltage vacuum circuit breaker.

Background

A vacuum circuit breaker in the current market is composed of a vacuum arc extinguish chamber, a contact spring, a transmission assembly, a permanent magnet mechanism, a return spring, a mounting base and the like. The action process is as follows:

1) after the permanent magnetic mechanism is electrified, the movable iron core and the static iron core are closed to drive the transmission assembly to move, so that the movable and static contacts of the vacuum arc extinguish chamber are pushed to be closed, meanwhile, the contact spring is compressed to provide pressure for the contacts, and the reset spring is compressed to store energy.

2) When the permanent magnetic mechanism loses power, the moving contact of the vacuum arc extinguish chamber is separated from the fixed contact under the action of the contact spring and the reset spring, and meanwhile, the moving iron core of the permanent magnetic mechanism resets.

Structural problems of current vacuum circuit breakers: when the circuit is overloaded or short-circuited, the vacuum circuit breaker has no capacity to cut off the fault circuit and can only rely on other protection components to protect the circuit.

Disclosure of Invention

In order to solve the technical problem, the invention provides a tripping device of a low-voltage vacuum circuit breaker.

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

the utility model provides a low pressure vacuum circuit breaker trip gear, including the electro-magnet, vacuum interrupter and tripping device, move in the electro-magnet control vacuum interrupter, the static contact or separation realize closing and separating brake, be equipped with tripping device between electro-magnet and the vacuum interrupter, tripping device includes a link assembly, link assembly has fold condition and relative straight state, the fold condition and the relative straight state of link assembly correspond tripping device's trip condition and hasp state respectively, when overload or short-circuit fault appear in the circuit, link assembly in time responds to switch into fold condition by relative straight state so that move in the vacuum interrupter, the static contact separation and rapid tripping.

Furthermore, tripping device includes laborsaving lever assembly, and tripping device triggers the unblock by laborsaving lever assembly and makes link assembly change fold condition into fast by relative straight state, and then realizes the quick tripping operation of circuit breaker.

Further, the labor-saving lever assembly includes a stop lever and a trip half-shaft, both of which are rotatable, the stop lever being configured to rotate against the linkage assembly to maintain the linkage assembly in a relatively flat state when the linkage assembly is in a relatively flat state, and the trip half-shaft being configured to rotate against the stop lever to lock the stop lever when the stop lever is pressed against the linkage assembly in a relatively flat state.

Furthermore, the tripping mechanism further comprises a mounting plate, a connecting rod and a push rod, wherein two ends of the connecting rod assembly are respectively hinged with the push rod and the connecting rod, the push rod is in transmission connection with a moving contact end of the vacuum arc extinguish chamber, the connecting rod is fixedly connected with the mounting plate and is opposite to the electromagnet, the stopping rod and the tripping half shaft are assembled on the mounting plate, the stopping rod rotates around the first pin shaft, and the first pin shaft and the tripping half shaft are respectively positioned on two sides of the connecting rod assembly.

Further, link assembly includes articulated first connecting rod and the second connecting rod of connecting, and first connecting rod is articulated with the connecting rod, and the second connecting rod is articulated with the push rod, and push rod and connecting rod are coaxial, and the first connecting rod of stop lever butt realizes link assembly's straight state and fold condition's switching through the relative motion of first connecting rod and second connecting rod.

Furthermore, the low-voltage vacuum circuit breaker tripping device further comprises a thermomagnetic trigger unit and a draw bar, wherein a movable contact end and a static contact end of the vacuum arc extinguish chamber are respectively connected with a wiring board, the wiring board at the movable contact end of the vacuum arc extinguish chamber is positioned between the vacuum arc extinguish chamber and the tripping mechanism and extends towards the front of the circuit breaker, the wiring board at the static contact end of the vacuum arc extinguish chamber extends towards the rear of the circuit breaker, the thermomagnetic trigger unit is connected on the wiring board at the movable contact end of the vacuum arc extinguish chamber, the draw bar is arranged between the thermomagnetic trigger unit and the tripping mechanism, when the circuit breaker is overloaded or short-circuited, the thermomagnetic trigger unit triggers the draw bar, and the triggered draw bar.

Furthermore, the thermomagnetic trigger unit comprises a thermal tripping element and a magnetic tripping element, the traction rod is triggered by the thermal tripping element when the circuit breaker is in a short circuit, and the traction rod is triggered by the magnetic tripping element when the circuit breaker is overloaded.

Furthermore, the low-voltage vacuum circuit breaker tripping device further comprises a reset alarm mechanism, wherein the reset alarm mechanism comprises an electromagnet control microswitch, a signal alarm microswitch and a reset button for driving the connecting rod assembly to reset.

Further, the mounting panel is assembled with a reset rod, one end of the reset rod is connected with the reset button in an abutting mode, the other end of the reset rod is connected with the second connecting rod in an abutting mode, and the reset button is pressed to enable the reset rod to convert the connecting rod assembly into a relatively straight state from a folded state.

Compared with the prior art, the invention has the following advantages:

1. when the circuit is overloaded/short-circuited, the tripping device of the low-voltage vacuum circuit breaker can cut off a fault circuit in time, so that the protection function is realized.

2. When the circuit is overloaded/short-circuited, the tripping device of the low-voltage vacuum circuit breaker sends out a fault alarm signal after tripping, and informs a user of timely maintenance.

3. The low-voltage vacuum circuit breaker tripping device can be switched on only after being manually reset after the circuit fault is eliminated, so that the switching-on when the circuit fault is not eliminated is avoided, and the accident is prevented from further expanding.

4. The labor-saving lever has the effect of amplifying the force by thousands of times, and the tripping mechanism can be quickly tripped by a small tripping force only by virtue of the labor-saving lever component, so that the circuit breaker can be quickly tripped.

Drawings

Fig. 1 is a side view of a part of the internal structure of a vacuum circuit breaker of an embodiment of the present invention;

fig. 2 is one of the perspective views of a trip mechanism of an embodiment of the present invention;

fig. 3 is an exploded view of a trip mechanism of an embodiment of the present invention;

fig. 4 is a second perspective view of the trip mechanism of the embodiment of the present invention;

FIG. 5 is one of the mounting schematic views of the trip half shaft return torsion spring;

FIG. 6 is a second schematic view of the installation of the trip half shaft return torsion spring;

FIG. 7 is one of the mounting illustrations of the detent lever return torsion spring;

FIG. 8 is a second schematic view of the installation of the detent lever return torsion spring;

fig. 9 is one of the lock-up states of the trip mechanism of the embodiment of the present invention;

fig. 10 is a second schematic view illustrating a locking state of the trip mechanism according to the embodiment of the invention;

fig. 11 is one of the trip states of the trip mechanism of the embodiment of the present invention;

fig. 12 is a second schematic diagram illustrating the tripping state of the tripping mechanism according to the embodiment of the invention;

fig. 13 is a force analysis diagram of the trip mechanism;

fig. 14 is a schematic view of a side view of a portion of the internal structure of the vacuum circuit breaker shown in fig. 1, with one return tension spring omitted;

fig. 15 is one of perspective views of the internal structure of a vacuum circuit breaker according to an embodiment of the present invention;

fig. 16 is a second perspective view of the internal structure of the vacuum circuit breaker of the embodiment of the present invention;

fig. 17 is a perspective view of a part of the internal structure of the vacuum circuit breaker according to the embodiment of the present invention.

Detailed Description

To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements. The orientation described below is referenced to fig. 1.

Referring to fig. 1 to 17, a tripping device of a low-voltage vacuum circuit breaker includes an electromagnet 100, a vacuum interrupter 600, and a tripping mechanism 200, wherein the electromagnet 100 controls the vacuum interrupter 600 to move inward and contact or separate a fixed contact to achieve switching on and off, the tripping mechanism 200 includes a link assembly having a folded state and a relatively flat state, the folded state and the relatively flat state of the link assembly respectively correspond to the tripping state and the locking state of the tripping mechanism 200, and when an overload/short circuit fault occurs in a circuit, the link assembly timely responds to the switching from the relatively flat state to the folded state to separate the movable contact and the fixed contact in the vacuum interrupter 600 to rapidly trip. The low voltage described herein is a voltage of no greater than 1500 volts.

The trip mechanism 200 includes a labor-saving lever assembly, and the trip mechanism triggers the unlocking by the labor-saving lever assembly to rapidly change the link assembly from a straight state to a folded state, thereby achieving the rapid trip of the circuit breaker.

Referring to fig. 2-12, the labor-saving lever assembly includes a stop lever 206 and a trip half shaft 205, both the stop lever 206 and the trip half shaft 205 being rotatable, the stop lever 206 being configured to rotate against the linkage assembly to maintain the linkage assembly in a relatively flat condition when the linkage assembly is in a relatively flat condition, and the trip half shaft 205 being configured to abut against the stop lever 206 to lock the stop lever 206 when the stop lever 206 is pressed against the linkage assembly in a relatively flat condition.

As shown in fig. 7 and 8, the stop lever 206 is configured with a stop lever return torsion spring 210, and the stop lever 206 has a tendency to press against the linkage assembly under the action of the stop lever return torsion spring 210. In the normal operating condition of the circuit breaker, as shown in fig. 9 and 10, the stop lever 206 urges the linkage assembly to a relatively flat condition under the action of the stop lever return torsion spring 210. The trip half shaft 205 is provided with a trip half shaft reset torsion spring 212, and in the normal operating state of the circuit breaker, the trip half shaft 205 abuts against the stop rod 206 under the action of the trip half shaft reset torsion spring 212 so that the stop rod 206 is kept in a state of abutting against the link assembly, and the link assembly is locked by the stop rod 206 and cannot move, and at this time, the trip mechanism 200 is in a locked state.

As shown in fig. 2 to 14, the trip mechanism 200 further includes a mounting plate 208, a connecting rod 204 and a push rod 201, two ends of the connecting rod assembly are respectively hinged to the push rod 201 and the connecting rod 204, one end of the push rod 201 is hinged to the connecting rod assembly, the other end of the push rod 201 is in transmission connection with a movable contact end of the vacuum interrupter 600, the connecting rod 204 is fixedly connected to the mounting plate 208 and opposite to the electromagnet 100, a stopping rod 206 and a trip half shaft 205 are both assembled on the mounting plate 208, the stopping rod 206 rotates around a first pin 211, and the first pin 211 and the trip half shaft 205 are respectively.

Preferably, the mounting plate 208 is U-shaped, and a through hole for the connection rod 204 to pass through is formed in the middle of the mounting plate 208. In order to control the moving track of the push rod 201, a guide plate 209 is mounted on the mounting plate 208, the guide plate 209 is provided with a guide through hole coaxial with the connecting rod 204, the push rod 201 penetrates through the guide through hole of the guide plate 209 and translates along the axial direction of the guide through hole, and the push rod 201 is coaxial with the connecting rod 204.

In a particular configuration, preferably, as shown in fig. 9-12, the stop lever 206 is connected to the mounting plate 208 by a first pin shaft 211, the trip half shaft 205 is located below the first pin shaft 211, and the linkage assembly is located between the first pin shaft 211 and the trip half shaft 205. One end of the stop lever 206 extends toward the trip half shaft 205, and in a normal operating state of the circuit breaker, one end of the stop lever 206 abuts against a left side surface of the trip half shaft 205, the trip half shaft 205 prevents counterclockwise rotation of the stop lever 206, and the other end of the stop lever 206 urges the link assembly to a relatively straight state.

As shown in fig. 2 to 8, the stop lever reset torsion spring 210 and the trip half-shaft reset torsion spring 212 are respectively sleeved at two ends of the first pin shaft, one end of the stop lever reset torsion spring 210 is fixed by the mounting plate, the other end of the stop lever reset torsion spring abuts against the stop lever, one end of the trip half-shaft reset torsion spring 212 is fixed by the mounting plate, and the other end of the trip half-shaft reset torsion spring abuts against the trip half shaft. The stop lever return torsion spring 210 acts on the stop lever in the opposite direction to the trip half shaft return torsion spring 212.

As shown in fig. 3, the trip half shaft 205 has a notch, and when the circuit has overload and short-circuit faults, the trip half shaft 205 is shifted to the notch where the stop lever 206 can enter the trip half shaft 205, so as to release the limit of the trip half shaft 205 to the stop lever 206. Specifically, as shown in fig. 11 and 12, the trip half shaft 205 is shifted to the notch upward, the link assembly is switched from the relatively straight state to the folded state, and the stop lever 206 can rotate counterclockwise under the action of the link assembly to enter the notch of the trip half shaft 205, so that the limit of the trip half shaft 205 on the stop lever 206 is released.

As shown in fig. 3, the link assembly includes a first link 203 and a second link 202 which are hingedly connected, and the switching of the straight state and the folded state of the link assembly is achieved by the relative movement of the first link 203 and the second link 202. As shown in fig. 9 to 12, the right end of the first link 203 is hinged to the connecting rod 204, the left end of the second link 202 is hinged to the push rod 201, and the stop rod 206 abuts against the first link 203.

The critical tripping force F6 for the tripping mechanism to release the tripping state satisfies the following equation:

wherein the content of the first and second substances,

F1L1＝F2L2，F2L3＝F4L4，F4L5f＝F6L6；

f6 is the critical tripping force for releasing the tripping state of the tripping mechanism; l6 is the moment arm of F6;

f4 is the force of the trip half shaft 205 on the stop lever 206;

l5 is the arm of the friction force created between trip bar 206 and trip half shaft 205;

l4 is the distance between the point of action of the trip half shaft 205 on the stop lever 206 and the center of rotation of the stop lever;

l3 is the arm of the force of the first link 203 on the stop lever 206;

f2 is the acting force of the stop lever 206 on the first link 203;

l2 is the distance between the hinge point of the first link 203 and the link lever and the point of action of the stop lever 206 on the first link 203;

f1 is a reaction force to which the trip mechanism 200 receives at the time of closing;

l1 is the moment arm of F1;

f is the coefficient of friction between the trip half shaft 205 and the stop lever 206.

By adjusting the parameters in the above formula, the size of F1 can be thousands of times of F6, and the driving force of the draw bar to the tripping half shaft is only larger than F6 to trip the tripping mechanism.

As shown in fig. 15 and 16, the vacuum circuit breaker according to this embodiment has a isolation plate 900, the electromagnet 100 and the trip mechanism 200 are located above the isolation plate 900, the vacuum interrupter 600 is located below the isolation plate 900, the circuit breaker further includes a rotating bracket 400 rotating around a fulcrum 401, the fulcrum 401 is connected to the isolation plate 900, a lower end of the rotating bracket 400 is connected to a moving contact end of the vacuum interrupter 600, a left end of the push rod 201 is fixed to an upper end of the rotating bracket 400, the electromagnet 100 moves the entire trip mechanism 200 by pushing the connecting rod 204 in a locking state of the trip mechanism 200, the push rod 201 moves leftward to enable the rotating bracket 400 to rotate around the fulcrum 401, and further drive the moving contact and the static contact in the vacuum interrupter 600 to realize closing. The circuit breaker is provided with a reset tension spring 300, one end of the reset tension spring 300 is connected to the upper end of the rotating bracket 400, and the other end of the reset tension spring is fixedly connected with the electromagnet 100. When the breaker is closed, the reset tension spring 300 is elongated to store energy.

When the first link 203 rotates clockwise, the stop rod 206 is pushed to rotate counterclockwise, the trip mechanism 200 enters a trip state, the return tension spring 300 automatically retracts to drive the rotating bracket 400 to rotate, so that the push rod 201 moves rightwards, and the first link 203 and the second link 202 form a folded state.

Preferably, the tripping device of the low-voltage vacuum circuit breaker further comprises a reset alarm mechanism, and the reset alarm mechanism is positioned above the tripping mechanism 200. Specifically, the reset alarm mechanism comprises an electromagnet control microswitch, a signal alarm microswitch and a reset button for driving the connecting rod assembly to reset.

The trip mechanism 200 further comprises a reset rod 207, the reset rod 207 is hinged to the mounting plate 208 through a pin shaft, the reset rod 207 is preferably a V-shaped rod, the upper end of the reset rod 207 abuts against the reset button, and the lower end of the reset rod 207 abuts against the second connecting rod 202. When the tripping mechanism 200 needs to be restored to the locking state from the tripping state, the reset button is pressed, the reset rod 207 rotates clockwise under the action of the reset button, and the lower end of the reset rod 207 presses the second connecting rod 202 downwards, so that the second connecting rod 202 and the first connecting rod 203 are restored to a relatively straight state from the folding state.

The low-voltage vacuum circuit breaker tripping device further comprises a thermomagnetic trigger unit 500 and a traction rod 700, wherein a movable contact end and a fixed contact end of the vacuum arc extinguish chamber are respectively connected with a wiring board 800, the wiring board 800 at the movable contact end of the vacuum arc extinguish chamber is positioned between the vacuum arc extinguish chamber and the tripping mechanism and extends towards the front of the circuit breaker, the wiring board at the fixed contact end of the vacuum arc extinguish chamber extends towards the rear of the circuit breaker, the thermomagnetic trigger unit is connected to the wiring board 800 at the movable contact end of the vacuum arc extinguish chamber, the traction rod 700 is arranged between the thermomagnetic trigger unit 500 and the tripping mechanism 200, the traction rod 700 is triggered by a thermomagnetic tripping element during overload, the traction rod 700 is triggered by the thermomagnetic tripping element during short circuit, and the triggered traction.

The thermal tripping element is an existing time-delay tripper with a bimetallic strip, the magnetic tripping element is an existing instantaneous tripper with a magnet yoke and an armature, the armature is connected with a striking rod 501, when the circuit breaker is overloaded, the bimetallic strip of the thermal tripping element is heated to deform to trigger a traction rod 700, when the circuit breaker is in short circuit, the magnet yoke of the magnetic tripping element attracts the armature, the striking rod 501 connected with the armature triggers the traction rod 700, the triggered traction rod 700 toggles a tripping half shaft 205 to enable a tripping mechanism 200 to enter a tripping state, and further the push rod 201 moves to trigger the circuit breaker to enter a tripping state. Meanwhile, the signal alarm microswitch outputs an alarm signal to inform a user; the electromagnet control microswitch switches off the electromagnet control circuit, causing the electromagnet 100 to lose power. After the fault is removed, the reset button is pressed by hand, so that the tripping mechanism 200 is reset from the tripping state to the locking state again, and preparation is made for the next closing.

The application principle of the tripping device of the low-voltage vacuum circuit breaker provided by the implementation is as follows:

1) when the circuit breaker is overloaded or short-circuited, the draw bar 700 pulls the tripping half shaft 205, so that the tripping half shaft 205 rotates to a state that the gap faces upwards to cancel the limitation on the stop rod 206, the reset tension spring 300 resets and retracts to make the push rod 201 move towards the connecting rod 204, so that the first connecting rod 203 and the second connecting rod 202 form an upwards arched folding state, in the process, the first connecting rod 203 rotates clockwise, the first connecting rod 203 pushes the stop rod 206 to rotate anticlockwise, and the lower end of the stop rod 206 enters the gap of the tripping half shaft 205. Meanwhile, the electromagnet controls the microswitch to cut off the electromagnet control circuit, so that the electromagnet 100 loses power and the breaker is switched off, and in addition, the signal alarm microswitch outputs an alarm signal to a user.

2) After the fault is cleared, the reset button is pressed by a hand, the reset button enables the reset rod 207 to rotate, the reset rod 207 presses the second connecting rod 202 downwards, the second connecting rod 202 rotates clockwise to be in a relatively straight state with the first connecting rod 203, at the moment, the stop rod 206 automatically rotates clockwise to reset to abut against the first connecting rod 203 under the action of the stop rod reset torsion spring 210, and the tripping half shaft 205 rotates clockwise to reset to abut against the lower end of the stop rod 206 under the action of the tripping half shaft reset torsion spring 212. When the electromagnet 100 is powered on, the movable iron core pushes the connecting rod 204, so that the tripping mechanism 200 moves leftwards, the rotating bracket 400 rotates under the action of the push rod 201, and then the movable contact of the vacuum arc-extinguishing chamber 600 is driven to move to the abutting fixed contact, so that the closing is realized.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (11)

1. The utility model provides a low pressure vacuum circuit breaker trip gear which characterized in that: the electromagnetic control vacuum arc extinguish chamber is controlled by the electromagnet to move, and the static contact is contacted or separated to realize switching on and switching off, the tripping mechanism is arranged between the electromagnet and the vacuum arc extinguish chamber and comprises a connecting rod assembly, the connecting rod assembly is provided with a folding state and a relatively straight state, the folding state and the relatively straight state of the connecting rod assembly respectively correspond to the tripping state and the locking state of the tripping mechanism, and when the circuit is overloaded or has a short-circuit fault, the connecting rod assembly timely responds to the situation that the folding state is switched to the folding state so as to enable the vacuum arc extinguish chamber to move, the static contact is separated and the vacuum arc extinguish chamber is.

2. The low voltage vacuum circuit breaker trip unit of claim 1, wherein: the tripping mechanism comprises a labor-saving lever component, the tripping mechanism triggers unlocking through the labor-saving lever component to enable the connecting rod component to be rapidly changed from a relatively straight state to a folded state, and then rapid tripping of the circuit breaker is achieved.

3. The low voltage vacuum circuit breaker trip unit of claim 2, wherein: the labor-saving lever assembly includes a stop lever and a trip half-shaft, both of which are rotatable, the stop lever being configured to rotate against the linkage assembly to maintain the linkage assembly in a relatively flat state when the linkage assembly is in a relatively flat state, the trip half-shaft being configured to rotate against the stop lever to lock the stop lever when the stop lever is pressed against the linkage assembly in a relatively flat state.

4. The low voltage vacuum circuit breaker trip unit of claim 3, wherein: the stop rod is provided with a stop rod reset torsion spring, and the stop rod has a tendency of abutting against the connecting rod assembly under the action of the stop rod reset torsion spring; the tripping half shaft is provided with a tripping half shaft reset torsion spring, and the tripping half shaft butts against the stop rod under the action of the tripping half shaft reset torsion spring so as to lock the stop rod.

5. The low voltage vacuum circuit breaker trip unit of claim 3, wherein: the tripping half shaft is provided with a notch, and when the circuit has overload/short circuit fault, the tripping half shaft is shifted to the position where the stop rod can enter the notch of the tripping half shaft, so that the limit of the tripping half shaft on the stop rod is removed.

6. The low voltage vacuum circuit breaker trip unit of claim 3, wherein: the tripping mechanism further comprises a mounting plate, a connecting rod and a push rod, two ends of the connecting rod assembly are respectively hinged with the push rod and the connecting rod, the push rod is in transmission connection with a moving contact end of the vacuum arc extinguish chamber, the connecting rod is fixedly connected with the mounting plate and is opposite to the electromagnet, the stop rod and the tripping half shaft are both assembled on the mounting plate, the stop rod rotates around the first pin shaft, and the first pin shaft and the tripping half shaft are respectively located on two sides of the connecting rod assembly.

7. The low voltage vacuum circuit breaker trip unit of claim 6, wherein: the connecting rod assembly comprises a first connecting rod and a second connecting rod which are connected in a hinged mode, the first connecting rod is hinged to the connecting rod, the second connecting rod is hinged to the push rod, the push rod and the connecting rod are coaxial, the stop rod abuts against the first connecting rod, and switching between a straight state and a folded state of the connecting rod assembly is achieved through relative movement of the first connecting rod and the second connecting rod.

8. The low voltage vacuum circuit breaker trip unit of claim 7, wherein: the low-voltage vacuum circuit breaker tripping device further comprises a thermomagnetic trigger unit and a draw bar, wherein a movable contact end and a fixed contact end of the vacuum arc extinguish chamber are respectively connected with a wiring board, the wiring board at the movable contact end of the vacuum arc extinguish chamber is positioned between the vacuum arc extinguish chamber and the tripping mechanism and extends towards the front of the circuit breaker, the wiring board at the fixed contact end of the vacuum arc extinguish chamber extends towards the rear of the circuit breaker, the thermomagnetic trigger unit is connected to the wiring board at the movable contact end of the vacuum arc extinguish chamber, the draw bar is arranged between the thermomagnetic trigger unit and the tripping mechanism, when the circuit breaker is overloaded or short-circuited, the thermomagnetic trigger unit triggers the draw bar, and the triggered.

9. The low voltage vacuum circuit breaker trip unit of claim 8, wherein: the thermal-magnetic triggering unit comprises a thermal tripping element and a magnetic tripping element, the thermal tripping element triggers the traction rod when the circuit breaker is in a short circuit, and the magnetic tripping element triggers the traction rod when the circuit breaker is overloaded.

10. The low voltage vacuum circuit breaker trip unit of claim 7, wherein: the low-voltage vacuum circuit breaker tripping device further comprises a reset alarm mechanism, wherein the reset alarm mechanism comprises an electromagnet control microswitch, a signal alarm microswitch and a reset button for driving the connecting rod assembly to reset.

11. The low voltage vacuum circuit breaker trip unit of claim 10, wherein: the equipment has the release link on the mounting panel, and release link one end butt reset button, other end butt second connecting rod enable the release link to convert link assembly into relative straight state by fold condition through pressing reset button.

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