WO2018209700A1

WO2018209700A1 - Circuit breaker chassis

Info

Publication number: WO2018209700A1
Application number: PCT/CN2017/085133
Authority: WO
Inventors: 杨长洲; 张欣; 庄志坚; 赵子雷
Original assignee: Abb 瑞士股份有限公司; 杨长洲; 张欣; 庄志坚; 赵子雷
Priority date: 2017-05-19
Filing date: 2017-05-19
Publication date: 2018-11-22
Also published as: CN110462950B; CN110462950A

Abstract

Disclosed is a circuit breaker chassis comprising a moving chassis (22) and a screw rod (211), and further comprising a cross beam (21), a locking and driving device (20) having a twin dead centre mechanism and a rotary auxiliary switch (29), wherein the cross beam (21) is detachably fixed in a switch cabinet; the screw rod (211) is mounted on the cross beam (21); the screw rod (211) rotatably moves, thereby driving the moving chassis (22) to move away from and near the cross beam (21); the rotary auxiliary switch (29) comprises an auxiliary opening and driving piece (291) capable of rotating around a rotary centre (292), and two pairs of auxiliary opening contact sets encircling the rotary centre (292); the locking and driving device (20) having a twin dead centre mechanism comprises a guide groove piece (204) rotating around a guide groove piece rotary centre (205); and one end of the guide groove piece (204) is provided with a guide groove (2041), and the other end is connected to an elastic soft connecting member, one end of the elastic soft connecting member being fixed.

Description

Circuit breaker chassis

Technical field

The invention belongs to the technical field of machinery and electric power products, and particularly relates to the technical field of high voltage switchgear. In particular, it relates to the field of circuit breaker equipment technology, and is used for propelling a chassis vehicle when the circuit breaker is operated.

Background technique

The circuit breaker chassis is used to safely and reliably move the circuit breaker into or out of the switchgear. The mechanical and electrical latching in the chassis is an important device to ensure the safe operation of the power grid, ensure life safety and prevent misoperation.

Specifically, the chassis and its range of mechanical and electrical lockouts require the following functions:

1) Move the circuit breaker into or out of the switchgear;

2) When the grounding switch is operated, the chassis car cannot move;

3) When the circuit breaker is in the closed state, the chassis car cannot move;

4) The circuit breaker can only be closed or opened when the chassis is in the test or working position;

5) The chassis can only be moved to move when the switch cabinet door is closed;

6) Only when the chassis car is in the test position can the chassis car be removed from the switch setting;

7) The auxiliary switch in the chassis provides the switch device protection and control device with the correct position signal of the chassis. The opening and closing of the auxiliary switch requires quick action to protect the auxiliary switch.

FIG. 1 shows a conventional circuit breaker chassis. At present, the cross member 11 of the medium voltage circuit breaker chassis is inserted into the switch cabinet through the upper tongue 111 to be fixed at the switch cabinet door, and the moving chassis 12 is provided with a screw. 13 mating nut 121, moving the chassis 12 through the fixed beam 11 The screw 13 on the screw moves closer to or away from the beam 11; the screw 13 has two screws 131 fixed thereon, and the screw 131 follows the screw 13 while driving the auxiliary drive mechanism 122 to quickly switch between two lines. The state of the switch 123; the moving chassis 12 is provided with a flap 124. The rotation of the flap 124 is controlled by a driving piece 112 fixed on the beam 11. When the circuit breaker is closed, the flap 124 is maintained by restricting the rotation of the flap 124. In the horizontal position, thereby restricting the rotation of the screw 131 on the screw rod, and now restricting the rotation of the screw rod 13, the locking of the chassis car cannot be moved when the circuit breaker is closed; the push rod 125 follows the flap 124 to rotate synchronously when the chassis car is at During the movement, the flap 124 is turned up to push the push rod 125 up, thereby restricting the circuit breaker closing operation.

The circuit breaker chassis shown in Fig. 1 realizes all the above functions, but the main problems are: 1) complicated structure, large number of parts and long assembly time; 2) complex motion mechanism and long adjustment time when the above functions are realized The transmission chain is long and there are many potential failure points. 3) There are two aspects that are good for safety. i) The process of leaving the working position or the test position to the middle position. The lead screw with a lead position of 10 mm needs to be rotated by about 180°, that is, the chassis has moved about 5 mm. After the circuit breaker is closed, the lead screw with a lead of 10mm needs to be rotated by about 180° to be restricted to rotate. At this time, the chassis is also moved by about 5mm, which reduces the breaker and switch cabinet of the circuit breaker. The depth of the bite of the static contact is both a safety factor and a safety hazard.

Summary of the invention

The invention provides a circuit breaker chassis vehicle, including a moving chassis, a screw rod, a beam, a locking and driving with a double dead point mechanism, in view of the shortcomings of the circuit breaker chassis of the prior art, such as complicated structure, complicated moving mechanism and hidden dangers. a device and a rotary auxiliary switch; the beam is detachably fixed in the switch cabinet; the screw is mounted on the beam; the screw is rotatably movable to move the moving chassis to move relative to the beam; and the rotary auxiliary switch includes rotation around the center of rotation Auxiliary drive piece, and two pairs of auxiliary opening contacts around the center of rotation; first pair of auxiliary contacts The groups are respectively located on opposite sides of the rotation center, and can be turned on or off by the auxiliary driving piece; the second pair of auxiliary opening contact groups are also respectively located on opposite sides of the rotation center, and can be additionally opened The driving piece is turned on or off; the locking and driving device with a double dead point mechanism includes a guiding piece which can rotate around the rotation center of the guiding piece; the guiding piece has a guiding groove at one end and an elastic softness at the other end a connecting member, one end of the elastic soft connecting member is fixed; the locking and driving device having a double dead point mechanism further comprises a test position opening member and a working position opening member; the test position opening member and the working position opening member can be synchronously wound The opening member rotates in a center of rotation; the locking and driving device having a double dead point mechanism further includes an opening member round pin fixed to the test position opening member and embedded in the guide groove of the guide groove piece; the opening member round pin With the rotation of the test piece opening member, it can slide along the guide groove, thereby driving the guide groove piece to rotate around the rotation center of the guide groove piece; the locking and driving device with double dead point mechanism further comprises a auxiliary open link, and one end is rotatably fixed In the test position The mouth member, and the other end rotatably connected auxiliary opening drive plate, thereby driving the secondary opening of the contact set on or off.

In accordance with a preferred embodiment of the present invention, the lead screw includes a test bit peg that rotates with the rotation of the lead screw and toggles the test bit opening member about the center of rotation of the opening member.

In accordance with a preferred embodiment of the present invention, the lead screw further includes a work bit peg that rotates with the rotation of the lead screw and toggles the work position opening member to rotate about the center of rotation of the opening member.

According to a preferred embodiment of the present invention, the test position opening member has a test position opening member slot adapted to cooperate with the test position pin, and the test position opening member is rotated as the screw rod rotates.

According to a preferred embodiment of the present invention, the working position opening member has a working position opening member slot adapted to cooperate with the working position pin, and the working position opening member is rotated as the screw rod rotates.

According to a preferred embodiment of the invention, the elastic soft connector is a cord attached to a tension spring.

According to still another preferred embodiment of the present invention, the elastic soft connector is a high strength elastic cord.

According to a preferred embodiment of the invention, a limit roller is further included for limiting the flexible soft connector.

According to a preferred embodiment of the present invention, when the chassis car moves from the intermediate position to the test position, the test position opening member rotates clockwise around the center of rotation of the opening member, and the opening member round pin moves in the guide groove of the guide groove piece. Pushing the guide groove to rotate counterclockwise around the center of rotation of the guide groove; when the connection between the rotation center of the opening member and the round pin of the opening member, and the connection between the circular pin of the opening member and the rotation center of the guide groove, the angle formed is larger than At 90°, the channel piece pulls the elastic soft connector to the right, and the elastic soft connector is in the energy storage state.

According to a preferred embodiment of the present invention, when the opening of the opening member and the opening of the opening member and the connection between the opening member and the center of rotation of the guide groove are formed, the angle formed is equal to 90°. The round pin is located in the guide groove at a position where the intermediate portion is away from the center of rotation of the opening member, but does not reach the end portion of the guide groove.

According to a preferred embodiment of the present invention, when the opening member round pin reaches the rotation center end position away from the opening member in the guide groove, the opening member round pin cannot continue to slide in the guide groove, and the chassis car is in the test position holding position. When the opening of the opening member and the connecting member round pin, and the connection between the opening member round pin and the center of rotation of the guide groove, the angle formed is less than 90°.

According to a preferred embodiment of the present invention, the latching and driving device having a double dead center mechanism further includes a circuit breaker opening and closing interlocking piece; and the circuit breaker opening and closing interlocking piece is in a middle position of the chassis car Driving the button release piece of the circuit breaker, so that the circuit breaker opening button and the circuit breaker closing button are disengaged from the circuit breaker operating mechanism.

According to a preferred embodiment of the present invention, the circuit breaker opening and closing interlocking piece comprises a button connection a rod and a button push rod; one end of the button link is rotatably fixed to the test position opening member, and the other end is connected to the button push rod.

According to a preferred embodiment of the present invention, the push button push rod moves up and down along the guide groove under the driving of the button link.

According to a preferred embodiment of the present invention, the latching and driving device having a double dead center mechanism further includes a test position closing limit piece; both ends of the test position pin are exposed to the screw rod, and when the circuit breaker When the chassis is in the test position and the circuit breaker is closed, the test position closing limit plate limits the test position pin, thereby limiting the rotation of the screw.

According to a preferred embodiment of the present invention, the latching and driving device having a double dead center mechanism further includes a working position closing limit piece; both ends of the working position pin are exposed to the screw rod, and when the circuit breaker When the chassis is in the working position and the circuit breaker is closed, the working position closing limit piece limits the working position pin, thereby limiting the rotation of the screw.

The circuit breaker chassis car of the invention has simple structure and few transmission chains; improves safety and reliability; has a double dead point mechanism locking and driving device, can quickly operate, protects the rotary auxiliary switch; can maintain the intermediate position safely and stably The state of the test position and the working position, the locking of the chassis car is stable and reliable; only when the chassis car is in the test position and the working position, the circuit breaker can be closed or the locking operation of the opening operation is stable and reliable.

DRAWINGS

1 is a schematic structural view of a conventional circuit breaker chassis car in a test position;

2 is an exploded perspective view of a circuit breaker chassis and a circuit breaker;

Figure 3 is a schematic view of the circuit breaker chassis when the circuit breaker is in the test position;

Figure 4 is a schematic view of the circuit breaker chassis when the circuit breaker is in the working position;

Figure 5 is a schematic view of the circuit breaker chassis when the circuit breaker is in the intermediate position;

Figure 6 is a schematic view showing the structure of a circuit breaker chassis of a preferred embodiment of the present invention;

7A-7B are schematic views of a circuit breaker chassis of a preferred embodiment of the present invention, wherein the latching and driving device, the lead screw and the rotary auxiliary switch portion have a double dead center mechanism; wherein FIG. 7A also shows The structure of the locking and driving device with the double dead point mechanism and the button release piece, and FIG. 7B is an enlarged view of the opening of the test position;

Figure 8 is a schematic view showing the structure of a circuit breaker chassis and a rotary auxiliary switch according to a preferred embodiment of the present invention;

9A-9C are schematic diagrams showing the driving method of the opening member in the latching and driving device 20 having a double dead center mechanism, wherein the chassis chassis of the circuit breaker of Fig. 9A is in an intermediate position; and the chassis of the circuit breaker of Fig. 9B is in the intermediate position to the test position. Intermediate transition position; Figure 9C breaker chassis is in and maintained in the test position;

10A-10D are schematic diagrams showing the change of the locking and driving device of the circuit breaker chassis vehicle from the intermediate position to the test position according to a preferred embodiment of the present invention; wherein the circuit breaker chassis of FIG. 10A is in an intermediate position; Figure 10B: The transition position of the circuit breaker chassis in the middle position to the middle of the test position; Figure 10C The circuit breaker chassis is in the middle of the transition from the intermediate position to the test position, the locking and driving device with double dead point mechanism is in the dead position; The 10D circuit breaker chassis is in and maintained in the test position;

11A-11C are schematic diagrams showing the change of the locking and driving device of the circuit breaker chassis of the circuit breaker chassis from the intermediate position to the working position according to a preferred embodiment of the present invention; wherein the chassis of the circuit breaker of Fig. 11A is in the middle position to Transition point in the middle of the working position; Figure 11B When the circuit breaker chassis is in the middle of the transition from the intermediate position to the middle of the working position, the locking and driving device with the double dead point mechanism is in the dead position; FIG. 11C is the circuit breaker chassis and is in the working position;

12A-12C are schematic diagrams showing the structure of a double-dead-point mechanism and a locking function of a circuit breaker chassis vehicle having a double dead-end mechanism and a locking device, wherein the chassis of FIG. 12A is in an intermediate position, Figure 12B, the chassis is in the test position, and Figure 12C is in the working position;

13A-13B are schematic views showing the structure of a circuit breaker chassis of a circuit breaker chassis having a double dead point mechanism and a locking device for achieving a locking function, wherein FIG. 13A is a side view and FIG. 13B is a top view. .

detailed description

A detailed description of alternative embodiments of the present invention is given below with reference to the accompanying drawings.

2 is a schematic exploded view of the circuit breaker chassis of the present invention. The circuit breaker 3 is placed on the chassis and fixed to the moving chassis 21 of the chassis 2 by fasteners.

3, FIG. 4 and FIG. 5 are schematic diagrams of the circuit breaker chassis, respectively indicating three position states of the circuit breaker 3 following the movement of the chassis 2: test position, working position and intermediate position, intermediate The position is between the experimental position and the working position; in the following description of the drawings, the test position, working position and intermediate position of the circuit breaker are respectively referred to as the test position, working position and intermediate position of the chassis vehicle; FIG. 3 indicates the open circuit. The five components corresponding to the lock of the chassis and the chassis are the closing button 31, the opening button 32, the button release tab 33, the lever piece 34 and the closing shaft 35.

FIG. 6 is a schematic structural view of a preferred embodiment of a circuit breaker chassis of the present invention. The circuit breaker chassis of the present invention includes a moving chassis 22 and a lead screw 211, and further includes a beam 21, a latching and driving device 20 having a double dead center mechanism, and a rotary auxiliary switch 29. The cross member 21 is detachably fixed in the switch cabinet; as shown, in accordance with a preferred embodiment of the present invention, the cross member 21 is inserted into the switch cabinet through the tab 212 thereon to secure the cross member 21 in the switch cabinet. The lead screw 211 is mounted on the beam 21; the screw rod 211 is rotatably moved to move the moving chassis 22 away from the beam 21. The beam 21 limits the position of the screw 211 relative to the beam 21 but does not limit the rotational movement of the screw 211; FIG. 9 is a preferred embodiment of the circuit breaker chassis of the present invention, the screw 211, the locking and driving with a double dead center mechanism A schematic diagram of the structure of the device 20 and the rotary auxiliary switch 29.

7A-7B are schematic views of a circuit breaker chassis of a preferred embodiment of the present invention, wherein the latching and driving device, the lead screw and the rotary auxiliary switch portion have a double dead center mechanism; wherein FIG. 7A also shows The structure of the locking and driving device with the double dead point mechanism and the button release piece, and Fig. 7B is an enlarged view of the opening of the test position. According to a preferred embodiment of the present invention, the test position finger 2111, the work position finger 2112 and the ground knife pin 2113 are fixed on the screw 211, following the synchronous rotation of the screw 211; the test position pin 2111 and the working position The fingers 2112 are respectively located on both sides of the nut 23 fixed to the moving chassis 22 as a driving member or a latching restriction of the latching and driving device 20 having a double dead center mechanism; the latching and driving device 20 having a double dead center mechanism is mounted on Move the chassis 22 on. The test position finger 2111 rotates with the rotation of the screw 211, and the test position opening member 201 is swung around the opening rotation center 202. The work position pin 2112 rotates as the screw 211 rotates, and the work position opening member 2010 is rotated about the opening member rotation center 202.

In accordance with a preferred embodiment of the present invention, the lead screw 211 and the nut 23 cooperate to urge the nut 23 to move toward or away from the beam 21 by the rotation of the screw 211. Since the nut 23 is fixed to the moving chassis 22, the circuit breaker 3 is fixed at Moving the chassis 22, thereby realizing the function of rotating the screw to move the chassis; the screw 211 has at least one parallel to the central axis of the screw rotation The slot and the sprocket 24 are provided with a characteristic flange that cooperates with the slot on the screw 211. This arrangement enables the sprocket 24 to rotate synchronously with the screw 211. The motor and the speed reduction mechanism 27 rotate the clutch 25 when energized, and the clutch 25 When the rotation is at a certain angle, the clutch chain assembly 26 is moved to rotate, thereby driving the sprocket 24 to rotate, further driving the screw 211 to rotate, thereby realizing the electric operation of the chassis 2, that is, driving the circuit breaker in the test position and working by electric energy. Movement between the positions; when the local knife handle is inserted into the grounding operation hole, that is, when the grounding switch is in the operating state, the driving blade 28 is moved to the left side of FIG. 6 for a distance to enter the rotating area of the grounding knife 2113 When the screw 211 drives the knife plucking pin 2113 to rotate, it will be restricted by the slot on the ground blade 28, so that the local knives operation, that is, the grounding switch operation, cannot move the chassis.

FIG. 8 is a schematic structural view of a rotary auxiliary switch 29 including a secondary opening driving piece 291 rotatable about a rotation center 292, and two pairs of auxiliary opening contact groups surrounding the rotation center 292; contacts 293 and contacts Point 296 is a pair of pairs of contacts, contact 294 and contact 295 are another pair of pairs of contacts; auxiliary drive plate 291 rotates about rotation center 292 to drive conductive sheets inside rotary auxiliary switch 29. Rotating, when the auxiliary driving piece is in the paired contact 293 and the contact 296 is connected, the on-and-off state of the pair of contacts 293 and the contact 296 is switched, when the auxiliary driving piece 291 is in the paired contact When the 294 and the contact 295 are connected, the on-and-off state of the pair of contacts 294 and the contact 295 is switched; in the preferred embodiment, the auxiliary drive chip 291 is set to be in the pair of

contacts

293 and 296. When the line position corresponds to the chassis working position 2901, the auxiliary opening driving piece 291 is set to be in the position where the pair of contacts 294 and the contact 295 are connected, corresponding to the chassis test position 2902, and the auxiliary opening driving piece 291 is not in the above position. Corresponds to the intermediate position of the chassis; the pair of contacts in the rotary auxiliary switch 29 Provided as a mixed normally open normally closed contact set; the rotary auxiliary switch 29 is fixed to the latching and driving device 20 having a double dead center mechanism through the fastening hole 297 and the corresponding fastener; and has a double dead point mechanism locking and driving Device 20 and auxiliary drive The movable piece 291 is connected to drive the auxiliary opening driving piece 291 to rotate.

The latching and driving device 20 having a double dead point mechanism includes a channel piece 204 that can rotate around the center of rotation of the channel piece 205; the channel piece 204 has a guiding groove 2041 at one end and an elastic soft connecting piece at the other end. One end of the elastic soft connector is fixed; the locking and driving device 20 having a double dead point mechanism further includes a test position opening member 201 and a work position opening member 2010; the test position opening member 201 and the work position opening member 2010 can be synchronized The ground rotates around the opening rotation center 202.

The test position opening member 201 has a test position opening member slot 2018 adapted to cooperate with the test position pin 2111, and the test position opening member 201 is rotated as the screw rod 211 rotates. The working position opening member 2010 has a working position opening member slot 20101, which is adapted to cooperate with the working position pin 2112, and drives the working position opening member 2010 to rotate according to the rotation of the screw rod 211.

The latching and driving device 20 having a double dead center mechanism further includes an opening member round pin 203 fixed to the test position opening member 201 and embedded in the guide groove 2041 of the guide groove piece 204; the opening member round pin 203 is provided The rotation of the test position opening member 201 can slide along the guide groove 2041 to drive the guide groove piece 204 to rotate around the guide groove rotation center 205. The latching and driving device 20 having a double dead center mechanism further includes a secondary opening link 2014, one end of which is rotatably fixed to the test position opening member 201, and the other end of which is rotatably connected to the auxiliary opening driving piece 291, thereby driving the said The auxiliary

opening contact group

293, 296, 294, 295 is turned on or off.

As shown in Fig. 10A, the double dead center mechanism of the latching and driving device 20 having a double dead center mechanism, the circuit breaker chassis is in an intermediate position. The opening rotation center 202 and the guide groove rotation center 205 are both fixed rotation centers, and the two have a constant center distance; the tension spring 208 is fixed at one end of the tension spring fixed end 209, and the other end is fixed to the left end of the soft cord 207, the soft rope The other end of the 207 is fixed to the guide groove piece 204, and the flexible cord 207 is not stretchable and is restricted to slide between the two limit rollers 206. It is also possible to directly use a high-intensity bomb. The flexible cord is fixed at one end to the channel piece 204, and the other end of the high-strength elastic cord is directly fixed. This replaces the connection of a soft cord and a tension spring, and the effect is the same.

In the above connection method, there are other alternatives, such as replacing the above-mentioned soft cord with a tension spring as a torsion spring, which rotates around the guide groove rotation center 205 in synchronization with the guide groove piece 204.

9A-9C is a schematic diagram showing the driving method of the opening member in the locking and driving device 20 having the double dead point mechanism, wherein the chassis of the circuit breaker of FIG. 9A is in the middle position; FIG. 9B is in the middle position of the circuit breaker chassis to the test. The transition position in the middle of the position; Figure 9C The circuit breaker chassis is in and held in the test position. The test position opening member 201 and the work position opening member 2010 are connected together by the opening joint member 2011, and the two rotate synchronously around the opening member rotation center 202 shown in FIG. 10A; the test position opening member 201 and the work position opening member 2010 are respectively located at the nut 23 Both sides are driven by the test position pin 2111 and the work position pin 2112, respectively, and the driving mode is the same as that shown in Figs. 9A-9C.

According to a preferred embodiment of the present invention, when the chassis is moved from the intermediate position to the test position, the screw 211 is rotated counterclockwise so that the test position pin 2111 fixed thereto is simultaneously rotated counterclockwise, and the test position is studed. 2111 simultaneously enters the opening area of the test position opening member 201, and the test position pin 2111 further rotates counterclockwise to push the test position opening member 201 to rotate clockwise, corresponding to the opening position of the test position corresponding to FIG. 10A, FIG. 10B and FIG. 10D. After passing the test position dead point 201, the test position opening member will rely on the ability of the tension spring 208 to release the automatic acceleration clockwise rotation, thereby driving away from the test position pin 2111 and maintaining the test position state; when the chassis car is from the test position to the middle The test position opening member 201 has a similar driving process when the position is moved.

10A-10D are schematic diagrams showing the change of the latching and driving device with the double dead point mechanism of the circuit breaker chassis of the circuit breaker chassis from the intermediate position to the test position according to a preferred embodiment of the present invention; Figure 10A The circuit breaker chassis is in the middle position; Figure 10B The circuit breaker chassis is in the middle position to the middle of the test position; Figure 10C The circuit breaker chassis is in the middle of the transition from the intermediate position to the test position, with a double dead point mechanism The latching and driving device are in a dead position; the chassis of the circuit breaker of Figure 10D is in and maintained in the test position;

When the chassis 2 moves from the intermediate position to the test position, the test position opening member 201 rotates clockwise around the opening rotation center 202 while the upper opening member round pin 203 moves in the guide groove 2041 of the guide groove 204, pushing The guide groove piece 204 rotates counterclockwise around the guide groove rotation center 205, and is formed when the opening member rotation center 202 and the opening member round pin 203 are connected, and the opening member round pin 203 and the guide groove rotation center 205 are connected. When the angle α is greater than 90°, the channel piece 204 pulls the flexible cord 207 to the right and pulls the tension spring 208 to the right. At this stage, the tension spring 208 is in an energy storage state, as shown in FIG. 10B.

When the connecting member rotation center 202 and the opening member round pin 203 are connected, and the opening member round pin 203 and the guide groove rotating center 205 are connected, the angle α formed by the angle is equal to 90°, which is called a dead point. 10C, at this time, the opening member round pin 203 is located in the guide groove 2041 at a position where the intermediate portion is away from the rotation center 202 of the opening member, but does not reach the end portion of the guide groove 2041. At this time, the test position opening member 201 is rotated a little clockwise, so that the connection between the rotation center 202 of the opening member and the opening member 203, and the connection between the opening member 203 and the rotation center 205 of the guide groove are formed. The angle α is less than 90°. As shown in FIG. 10D, the tension spring 208 will contract and release part of the energy, and the soft cord 207 is pulled to the left, thereby pushing the guide groove 204 to rotate in the opposite direction, that is, clockwise around the center of rotation of the guide groove 205. Rotating, through the opening member round pin 203, accelerates the clockwise rotation speed of the test position opening member 201. The accelerated rotation of the test position opening member 201 allows the rotary auxiliary switch 29 to quickly extinguish the arc, thereby protecting the rotary auxiliary switch 29. When the opening member round pin 203 reaches the end position away from the opening center 202 of the opening member in the guiding groove 2041, the opening member round pin 203 cannot continue to slide in the guiding groove 2041, and the chassis car is in the test position holding position, according to the most a good example, at this time, When the opening center rotation center 202 and the opening member round pin 203 are connected, and the opening member round pin 203 and the guide groove rotation center 205 are connected, the angle α formed is less than 90°, and the preferred α is 80°. 86°.

On the contrary, when the chassis 2 moves from the test position to the intermediate position, the test position opening member 201 rotates counterclockwise under the toggle of the test position dial 2111 of the screw 211, and the tension spring is passed before the test position is dead. The 208 is stretched to perform energy storage. When the test position is dead, the tension spring 208 contracts to release energy, pulls the soft cord 207 and drives the guide groove 204 to rotate clockwise, thereby accelerating the test position opening member 201 to rotate counterclockwise to the intermediate position. Until the connection between the rotation center 202 of the opening member and the round pin 203 of the opening member, and the line connecting the circular pin 203 of the opening member and the rotation center 205 of the guide groove, the angle α formed is 180°, that is, the chassis is returned to the intermediate position. As shown in Figure 10A. The accelerated rotation of the test position opening member 201 can cause the rotary auxiliary switch 29 to quickly extinguish the arc, thereby protecting the rotary auxiliary switch 29, and at the same time, the locking device can be quickly operated to achieve the locking.

11A-11C are schematic diagrams showing the change of the locking and driving device of the circuit breaker chassis of the circuit breaker chassis from the intermediate position to the working position according to a preferred embodiment of the present invention; wherein the chassis of the circuit breaker of Fig. 11A is in the middle position to The transition position in the middle of the working position; Figure 11B The circuit breaker chassis is in the middle of the intermediate position to the middle of the working position, the locking and driving device with double dead point mechanism is in the dead position; Figure 11C The circuit breaker chassis is in and keep working position. According to a preferred embodiment of the present invention, when the chassis car is moved directly to the working position in the intermediate position (shown in FIG. 10A), the same process as described above is also present, and a dead point is the dead point of the working position; There is always a large force arm for the force of the tension spring 208 on the channel piece 204, so that the channel piece 204 and the test position opening piece 201 can be kept in the middle position, and the dead point and the working position are dead. The presence of the point enables the tension spring 208 to automatically switch between the energy storage and release capabilities before and after the dead point, thereby achieving a fast switching of the auxiliary opening and the test position, working position and intermediate position of the chassis. The auxiliary open state is maintained and the reliable latching is achieved.

12A-12C are schematic diagrams showing the structure of a double-dead-point mechanism and a locking function of a circuit breaker chassis vehicle having a double dead-end mechanism and a locking device, wherein the chassis of FIG. 12A is in an intermediate position, 12B is in the test position, and the chassis of FIG. 12C is in the working position, and the double-dead mechanism locking and driving device 20 drives the auxiliary opening and the button release piece. According to a preferred embodiment of the present invention, there is a double death. The latching and driving device 20 of the point mechanism further includes a circuit breaker opening and closing interlocking piece; the circuit breaker opening and closing interlocking piece drives the button release piece 33 of the circuit breaker to move when the chassis car is in the middle position, thereby The circuit breaker opening button 32 and the circuit breaker closing button 31 are disengaged from the circuit breaker operating mechanism.

According to a preferred embodiment of the present invention, when the chassis is moved from the test position or the working position to the intermediate position, the test position opening member 201 is returned to the intermediate position by the tension spring 208, and the button pull rod 2013 is moved to push the button push rod. Moving upwards in 2012, the push button pusher 2012 moves up and down along the guide groove with the push of the button link 2013. The button release piece 33 is pushed downward by the lever piece 34, so that the closing button 31 shown in FIG. 3 cannot control the circuit breaker closing even if pressed, so that when the chassis car moves, it is in the middle position and cannot be closed. The locking function; when the chassis car moves from the test position or the working position to the intermediate position, the test position opening member 201 pushes the auxiliary opening driving piece 291 to return to the intermediate position through the auxiliary opening link 2014, thereby realizing the indication of the auxiliary switch to the intermediate position of the chassis vehicle; When the chassis car moves from the intermediate position to the test position or the working position, correspondingly, the test position opening member 201 drives the button pull rod 2013 to move, thereby pulling the button push rod 2012 to move downward, releasing the counter-clock movement space of the lever piece 34, so that The button trip piece 33 can move upward under the action of the upper return spring, thereby realizing the normal closing or opening operation of the chassis car in the working position or the test position.

On the other hand, when the chassis car moves from the intermediate position to the test position or the working position, the test position opening member 201 drives the auxiliary opening lever 2014 to drive the auxiliary opening driving piece 291 to indicate the corresponding working position or test position, so that the rotary auxiliary switch 29 is realized. The correct indication of the three positions of the chassis and provides the correct position signal to the switchgear secondary control; as illustrated in Figure 7, the rotary auxiliary switch is enabled due to the double dead center mechanism of the latch and drive unit 20 with double dead point mechanism The three position state switching of 29 has a fast characteristic, realizes a fast arc cutting of the rotary auxiliary switch, protects the rotary auxiliary switch, and prolongs its life; on the other hand, the locking and driving device 20 having a double dead point mechanism has double The dead-end mechanism feature makes the latching feature fast and improves the reliability of the latch.

13A-13B are schematic views showing the structure of a circuit breaker chassis car according to a preferred embodiment of the present invention, which has a double dead point mechanism locking and a driving device for locking. According to a preferred embodiment of the present invention, the latching and driving device 20 having a double dead center mechanism further includes a test position closing limit piece 2021; both ends of the test position finger 2111 expose the screw rod 211, and When the circuit breaker chassis is in the test position and the circuit breaker is closed, the test position closing limit piece 2021 limits the test position pin 2111, thereby restricting the rotation of the screw 211.

According to a preferred embodiment of the present invention, the latching and driving device 20 having a double dead center mechanism further includes a work position closing limit plate 2020; both ends of the work position pin 2112 expose the screw rod 211, and When the circuit breaker chassis is in the working position and the circuit breaker is closed, the working position closing limit plate 2020 limits the working position pin 2112, thereby restricting the rotation of the screw 211.

The test position pin 2111 and the work position pin 2112 are fixed to the screw rod 211, and both ends protrude from the outer periphery of the screw rod 211; as shown in Fig. 11, when the circuit breaker chassis car is in the test position or the working position, the circuit breaker can When the closing or opening operation is performed, if the circuit breaker is closed, the closing movement shaft 35 of the circuit breaker will move upward, and the driving closing flap 2015 will rotate counterclockwise to push the closing push rod 2016 as shown in the figure. The right side of the movement, which in turn pushes the public putter 2019 Moving forward, the working position closing limit piece 2020 and the test position closing limit piece 2021 connected with the common push rod 2019 are simultaneously rotated clockwise, the working position closing limit piece 2020 and the test position closing limit piece The other end of the 2021 protrudes toward the screw rod 211, thereby restricting the rotation of the working position pin 2112 or the test position pin 2111, thereby restricting the rotation of the screw rod 211, so that the locking function of the chassis car cannot be moved when the circuit breaker is closed; Since both the test position pin 2111 and the work position pin 2112 protrude from both ends of the screw rod 211, the test position closing limit piece 2021 and the work position closing piece 2020 are disposed at the test position opening piece 201 and the working position. The opening member 2010 is opposite to the other side of the screw rod, so that the lock that cannot be moved during closing can only limit the rotation of the screw rod by rotating a little angle, and the rotation of the chassis is required to be limited by 180° compared with the existing chassis. safety.

When the chassis is in the test position or the working position, when the circuit breaker is switched from the closed state to the open state, that is, when the opening operation is performed, the closing moving shaft 35 moves downward, and the closing remake 2015 acts on the return spring. Next, rotate clockwise to reset. The closing push rod 2016 and the common push rod 2019 are moved by the push rod return spring 2017 to the left direction shown in the figure, so that the test position closing limit piece 2021 and the working position closing limit piece 2020 are simultaneously Rotating counterclockwise separates the movement space of the test position finger 2111 and the work position finger 2112, thereby releasing the limit, and the screw rod 211 releases the rotation limit.

The circuit breaker chassis provided by the invention has at least the following advantages over the existing circuit breaker chassis: 1) the structure is simple, the number of parts is small, and the assembly time is short. 2) The adjustment time is short and the transmission chain is small. 3) When the circuit breaker is closed, the angle at which the screw is rotated is limited, which improves safety and reliability. 4) The locking and driving device with double dead point mechanism can quickly move and protect the rotary auxiliary switch. 5) The locking and driving device with double dead point mechanism can maintain the state of intermediate position, test position and working position safely and stably. 6) The locking and driving device with double dead point mechanism makes the locking of the chassis car unable to move stable and reliable when the circuit breaker is in the closing state; the circuit breaker can only be closed when the chassis car is in the test position and working position. Or the blocking of the opening operation is also stable and reliable.

While the invention has been described with respect to the preferred embodiments and the embodiments of the invention Retouching. Therefore, the present invention should not be limited by the description of the preferred embodiments and the accompanying drawings, and the scope of the invention is defined by the scope of the appended claims.

Claims

A circuit breaker chassis truck comprising a moving chassis (22) and a lead screw (211), characterized in that it further comprises a beam (21), a latching and driving device (20) with a double dead center mechanism, and a rotary auxiliary switch (29) );

The beam (21) is detachably fixed in the switch cabinet; the screw (211) is mounted on the beam (21); the screw (211) is rotatably moved to drive the moving chassis (22) to the beam (21) mobile;

The rotary auxiliary switch (29) includes a secondary opening drive piece (291) rotatable about the rotation center (292), and two pairs of auxiliary opening contact sets surrounding the rotation center (292); the first pair of auxiliary opening contact sets ( 293), (296) are respectively located on opposite sides of the rotation center (292), and can be turned on or off by the auxiliary driving piece (291); the second pair of auxiliary opening contact groups (294), (295) They are also located on opposite sides of the center of rotation (292), and can be turned on or off by the auxiliary driving piece (291);

A latching and driving device (20) having a double dead center mechanism, comprising a guide groove piece (204) rotatable around a rotation center (205) of the guide groove piece; a guide groove (2041) is opened at one end of the guide groove piece (204), The other end is connected with an elastic soft connector, and one end of the elastic soft connector is fixed;

The latching and driving device (20) having a double dead center mechanism further includes a test bit opening member (201) and a working position opening member (2010); the test position opening member (201) and the working position opening member (2010) are synchronous Rotating around the center of rotation of the opening member (202);

The latching and driving device (20) having a double dead center mechanism further includes an opening member round pin (203) fixed to the test position opening member (201) and embedded in the guide groove (2041) of the guide groove piece (204) The opening member round pin (203) is rotated along the guide groove according to the rotation of the test position opening member (201) (2041) sliding, thereby driving the guide groove piece (204) to rotate around the rotation center (205) of the guide groove piece;

The latching and driving device (20) having a double dead center mechanism further includes a secondary opening link (2014), one end of which is rotatably fixed to the test position opening member (201), and the other end of which is rotatably connected to the auxiliary opening driving piece ( 291), thereby driving the auxiliary open contact group (293), (296); (294), (295) on or off.
The circuit breaker chassis according to claim 1, wherein said screw (211) comprises a test position pin (2111) which rotates with the rotation of the screw (211) and dials the test position opening. The member (201) rotates about the center of rotation of the opening member (202).
The circuit breaker chassis according to claim 1, wherein said screw (211) further comprises a work position finger (2112) that rotates with the rotation of the screw (211) and dials the working position. The opening member (2010) rotates about the center of rotation of the opening member (202).
The circuit breaker chassis according to claim 1, wherein the test position opening member (201) has a test position opening member slot (2018) adapted to fit the test position pin (2111), along with the screw rod. The rotation of (211) drives the test position opening member (201) to rotate.
The circuit breaker chassis truck according to claim 1, wherein the working position opening member (2010) has a working position opening member slot (20101) adapted to cooperate with the working position pin (2112), and the screw rod The rotation of (211) drives the working position opening member (2010) to rotate.
The circuit breaker chassis of claim 1 wherein said resilient soft connector is a cord (207) coupled to a tension spring (208).
A circuit breaker chassis according to claim 1, wherein said elastic soft connecting member is a high-strength elastic cord.
The circuit breaker chassis of claim 1 further comprising a limit Roller (206) for limiting the elastic soft connector.
The circuit breaker chassis according to claim 1, wherein when the chassis (2) is moved from the intermediate position to the test position, the test position opening member (201) rotates clockwise around the opening center (202) of the opening member. At the same time, the opening member round pin (203) moves in the guide groove (2041) of the guide groove piece (204), and pushes the guide groove piece (204) to rotate counterclockwise around the guide groove rotation center (205); when the opening member rotates the center (202) and the opening of the round member (203) of the opening member, and the connection between the opening member round pin (203) and the center of rotation of the guide groove piece (205), when the angle formed by the angle is greater than 90°, the guide groove piece ( 204) Pull the elastic soft connector to move to the right, and the elastic soft connector is in an energy storage state.
A circuit breaker chassis according to claim 9, wherein: a line connecting the opening center of the opening member (202) and the opening member round pin (203), and the opening member round pin (203) and the center of rotation of the guide groove piece (205) The connection, when the angle formed is equal to 90°, the opening member round pin (203) is located in the guide groove (2041) at a position away from the center of rotation of the opening member (202), but does not reach the guide. The end of the slot (2041).
A circuit breaker chassis according to claim 1, wherein when the opening member round pin (203) reaches the end position away from the rotation center (202) of the opening member in the guide groove (2041), the opening member round pin ( 203) unable to continue sliding in the guide groove (2041), the chassis car is in the test position holding position, at this time, the connection center of the opening member (202) and the opening member round pin (203), and the opening member round pin (203) The line connecting the center of rotation of the channel piece (205) forms an angle of less than (90) °.
The circuit breaker chassis according to claim 1, wherein said locking and driving device (20) having a double dead center mechanism further comprises a circuit breaker opening and closing interlocking piece; said circuit breaker opening and closing When the chassis is in the middle position, the lock piece drives the button release piece (33) of the circuit breaker to move, so that the circuit breaker opening button (32) and the circuit breaker closing button (31) Disengaged from the circuit breaker operating mechanism.
The circuit breaker chassis according to claim 11, wherein said circuit breaker opening and closing interlocking piece comprises a button connecting rod (2013) and a button push rod (2012); and said one end of said button connecting rod (2013) It is rotatably fixed to the test position opening (201) and the other end is connected to the push button (2012).
The circuit breaker chassis according to claim 12, wherein said push button (2012) is moved up and down along the guide groove by the push button (2013).
The circuit breaker chassis according to claim 1, wherein said locking and driving device (20) having a double dead center mechanism further comprises a test position closing limit piece (2021); said test position pin The screw rod (211) is exposed at both ends of (2111), and when the circuit breaker chassis is in the test position and the circuit breaker is closed, the test position closing limit piece (2021) limits the test position pin (2111) ), thereby limiting the rotation of the screw (211).
The circuit breaker chassis according to claim 1, wherein said locking and driving device (20) having a double dead center mechanism further comprises a working position closing limit piece (2020); said working position pin The screw rod (211) is exposed at both ends of (2112), and when the circuit breaker chassis is in the working position and the circuit breaker is closed, the working position closing limit piece (2020) limits the work position pin (2112) ), thereby limiting the rotation of the screw (211).