WO2021208355A1

WO2021208355A1 - Switch cabinet interlock mechanism for preventing five types of accidental operations

Info

Publication number: WO2021208355A1
Application number: PCT/CN2020/116036
Authority: WO
Inventors: 林存朋; 张小武
Original assignee: 亨斯迈(杭州)电力技术有限公司
Priority date: 2020-04-17
Filing date: 2020-09-18
Publication date: 2021-10-21
Also published as: CN111508764A

Abstract

A switch cabinet interlock mechanism for preventing five types of accidental operations has a locking rotating shaft (3) provided with a connection plate (31). The connection plate (31) is linked to a circuit breaker shaft (10). A opening pawl (32) is provided at a position where the locking rotating shaft (3) and an isolation lock rod (4) intersect. An opening block is correspondingly provided on the isolation lock rod (4) relative to the opening pawl (32). Two ends of the isolation lock rod (4) are provided with an active wheel plate (42) and an isolation locking plate (43), respectively. Two ends of a locking push rod (5) are provided with a grounding locking plate (51) and a cam plate (52), respectively. An isolation rotating shaft (6) and a grounding rotating shaft (7) are provided in parallel at two sides of the locking rotating shaft (3), respectively. The isolation locking plate (43) and the cam plate (52) are sleeved on the isolation rotating shaft (6), and rotate coaxially. The active wheel plate (42) and the grounding locking plate (51) are sleeved on the grounding rotating shaft (7), and rotate coaxially. The isolation rotating shaft (6) is linked to an isolation knife. The grounding rotating shaft (7) is linked to a grounding knife. The active wheel plate (42) is provided with a piston (8). One end of the piston (8) is linked to a closing pawl of a circuit breaker. The invention performs, by obtaining an opening or closing position of the circuit breaker shaft (10), an interconnected interlocking operation procedure centered around blocking closing of the circuit breaker.

Description

Five-proof interlocking mechanism for switch cabinet

Technical field

The invention relates to a five-proof interlocking mechanism for a switch cabinet.

Background technique

The main function of the switchgear is to open and close, control and protect electrical equipment during the process of power generation, transmission, distribution and electrical energy conversion in the power system. The components in the switchgear mainly include vacuum circuit breakers, isolating switches, and grounding switches. In order to realize the five preventions of the switchgear, it is necessary to set up a five-proof interlocking mechanism between each component.

The five-prevention interlocking mechanism of the existing five-prevention interlocking switch cabinet usually adopts a linkage method to ensure that the vacuum circuit breaker can be disconnected at the same time as the isolating switch and the grounding switch. When the disconnecting switch is powered on, the five-prevention interlocking mechanism will be disconnected Vacuum circuit breakers cannot prevent the occurrence of misoperations, but can only reduce the consequences of misoperations, and there are certain hidden safety hazards; in order to ensure that the five-prevention interlocking mechanism can disconnect the vacuum circuit breaker in time, the five-prevention interlocking mechanism is usually the same as the vacuum circuit breaker. The opening and locking linkage connection, the five-prevention interlocking mechanism can only be operated when the circuit breaker is opened, but in this connection mode, the circuit breaker opening position signal is only uploaded through the electrical opening and closing point, and the circuit breaker is opened and closed. The circuit breaker can still be closed when the electrical control circuit of the brake and other equipment in the cabinet is operated, but it will be disconnected immediately after closing. There are certain safety hazards during the operation; and the existing five-prevention interlocking mechanism is scattered in the open circuit At the location of the switchgear, isolating switch and grounding switch, the structure of the switch cabinet is complicated and the installation is inconvenient.

Summary of the invention

In view of the above shortcomings, the present invention provides a five-prevention interlocking mechanism for switch cabinets that is connected to the circuit breaker operating mechanism as a whole. Interlocking is performed by collecting the opening and closing positions of the main shaft of the circuit breaker and centering on closing the circuit breaker. The operating sequence has the advantages of high safety, compact structure, and convenient installation.

In order to achieve the above objectives, the present invention adopts a five-proof interlocking mechanism for switch cabinets, including a chassis, a door closing shaft, a locking shaft, an isolation lock lever, a locking push rod, a closing shaft, an isolation lock rod, and a locking push rod. They are arranged in parallel in the chassis, the locking shaft and the door closing shaft, the isolation lock rod, and the locking push rod are arranged perpendicular to each other in the chassis. An opening detent is set at the intersecting position of the rod, and an opening block is provided on the isolating lock rod corresponding to the opening detent. Both ends of the isolating lock rod are provided with a driving wheel plate and an isolating locking plate, and both ends of the locking push rod are provided with Grounding locking plate and cam plate. Two sides of the locking shaft are respectively provided with isolating shaft and grounding shaft in parallel. The isolating locking plate and cam plate are sleeved on the isolating shaft to rotate coaxially, and the driving wheel plate and grounding locking plate are sleeved on the grounding shaft. Coaxial rotation, the isolation shaft is linked with the isolation knife, and the ground shaft is linked with the ground knife. The outer periphery of the isolation lock plate and the ground lock plate respectively form a plurality of lock grooves that cooperate with the isolation lock rod and the lock push rod. The driving wheel plate is provided There is a piston, one end of the piston is linked to the circuit breaker closing detent. The isolation lock rod is sleeved with a reset spring that pulls the isolation lock rod to the driving wheel plate, and the lock push rod is sleeved to pull the lock push rod to the cam plate. The return spring.

The present invention further states that the door closing shaft is arranged outside one end of the locking shaft, the door closing shaft and the locking shaft are meshed and linked by bevel gears, and the door closing shaft is provided with a door locking plate.

The present invention further states that the isolation locking plate and the grounding locking plate are both provided with four locking grooves, and the four locking grooves are arranged at an equal angle of 90°.

The present invention further states that the isolation shaft and the grounding shaft are all hexagonal shafts, and the centers of the driving wheel plate, the cam plate, the isolation blocking plate and the grounding blocking plate form a hexagonal hole corresponding to the hexagonal shaft.

The invention further says that the isolation lock rod and the lock push rod are provided with a relief groove for the lock shaft to pass through.

The present invention further states that the opening block is an opening bearing connected to the isolation lock rod.

The beneficial effect of the present invention is that a cam plate and a locking plate are provided on the isolating shaft and the grounding shaft, and the isolating lock lever and the locking push rod adopt the cam plate and the locking plate at both ends to realize the pushing and locking of the rotating shaft. The cam plate and the locking plate can mutually restrict each other to realize interlocking, with simple structure and convenient operation; the locking shaft transmits the state of the main shaft of the circuit breaker to the closing shaft and the isolating lock lever to realize the locking of the cabinet door and the isolating switch; the grounding shaft The driving wheel is provided with a piston and the circuit breaker closing detent linkage to realize interlocking to prevent the circuit breaker from being switched on in the closed state of the grounding switch.

The present invention collects the opening and closing positions of the main shaft of the circuit breaker and performs the operation sequence of interconnection and interlocking with the closing of the closed circuit breaker as the center. , Synchronous locking five-proof interlocking mechanism operating small door effectively prevents misoperation. When the circuit breaker is in position, the operating small door of the mechanism is unlocked. When the grounding switch is operated, the circuit breaker closing detent is locked synchronously, the shaft of the isolation switch is locked, and the grounding knife is prevented. The closing operation circuit breaker closes the isolation switch.

Description of the drawings

Fig. 1 is a schematic diagram of a specific embodiment of the present invention.

Fig. 2 is a schematic diagram showing the cooperation of the isolation lock rod according to a specific embodiment of the present invention.

Fig. 3 is a schematic diagram of the cooperation of a locking push rod according to a specific embodiment of the present invention.

Figure 4 is an assembled side view of a specific embodiment of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1 to 4, the specific embodiment of the present invention is a five-proof interlocking mechanism for switch cabinets, including a chassis 1, a door closing shaft 2, a locking shaft 3, an isolation lock lever 4, and a locking push rod 5. The door closing shaft 2, the isolation lock lever 4, and the locking push rod 5 are arranged in the chassis 1 in parallel, and the locking shaft 3 and the closing shaft 2, the isolation lock rod 4, and the locking push rod 5 are arranged perpendicular to each other in the chassis 1 to lock A connecting plate 31 is provided on the rotating shaft 3, and the connecting plate 31 is linked to the main shaft 10 of the circuit breaker. The locking rotating shaft 3 is provided with an opening detent 32 at the position where it intersects with the isolating lock lever 4, and the isolating lock lever 4 corresponds to the opening detent. 32 is provided with an opening bearing 41, both ends of the isolation lock rod 4 are respectively provided with a driving wheel plate 42 and an isolation lock plate 43, both ends of the lock push rod 5 are respectively provided with a grounding lock plate 51 and a cam plate 52, and both sides of the rotation shaft 3 are locked The isolation shaft 6 and the grounding shaft 7 are respectively arranged in parallel, the isolation locking plate 43 and the cam plate 52 are sleeved on the isolating shaft 6 to rotate coaxially, and the driving wheel plate 42 and the grounding locking plate 51 are sleeved on the grounding shaft 7 to rotate coaxially. , The isolating shaft 6 is linked to the isolating knife, the grounding shaft 7 is linked to the grounding knife, the outer circumference of the isolating locking plate 43 and the grounding locking plate 51 are provided with four locking grooves 44 that cooperate with the isolating lock rod 4 and the locking push rod 5. The two locking grooves are arranged at equal angles of 90°. The driving wheel plate 42 is provided with a piston 8 which moves up and down in the piston sleeve 81. One end of the piston 8 is linked to the circuit breaker closing detent, and the isolation lock rod 4 is sleeved. A return spring 9 is provided to pull the isolation lock lever 4 to the driving wheel plate 42. The lock push rod 5 is sleeved with a return spring that pulls the lock push rod 5 to the cam plate 52. The door closing shaft 2 is arranged at one end of the lock shaft 3 In addition, the door closing shaft 2 and the locking shaft 3 are meshed and linked by bevel gears. The door closing shaft 2 is provided with a door lock plate 21. The door lock plate 21 cooperates with the door lock to achieve locking. The isolation lock rod 4 and the lock push rod 5 form a lock for locking. A relief slot 45 through which the rotating shaft 3 passes.

The isolating shaft 6 and the grounding shaft 7 are both hexagonal shafts, and the centers of the driving wheel plate 42, the cam plate 52, the isolating locking plate 43 and the grounding locking plate 51 form a hexagonal hole corresponding to the hexagonal shaft.

In addition to the above-mentioned structures, the isolation blocking plate and the grounding blocking plate of the present invention can also adopt a disc-shaped structure capable of lateral locking such as gears.

The above-mentioned specific embodiments are preferred embodiments of the present invention. In addition to the above-mentioned embodiments, other obvious changes of the present invention, such as the hexagonal shaft of the isolated shaft and the grounded shaft, can be changed to any special-shaped shaft, etc. The changes are also within the protection scope of the present invention. .

Claims

A five-prevention interlocking mechanism for switch cabinets, characterized in that: the five-prevention interlocking mechanism includes a chassis, a door closing shaft, a locking shaft, an isolation lock rod, a locking push rod, a door closing shaft, an isolation lock rod, The locking push rod is arranged in parallel in the chassis, the locking shaft and the door closing shaft, the isolation lock rod, and the locking push rod are arranged perpendicularly to each other in the chassis. An opening detent is set at the position where it intersects with the isolating lock rod, and the isolating lock rod is provided with an isolating block corresponding to the opening detent. Both ends of the isolating lock rod are respectively provided with a driving wheel plate and an isolating locking plate, and both ends of the locking push rod are provided. A grounding lock plate and a cam plate are respectively provided, and an isolation shaft and a grounding shaft are respectively arranged in parallel on both sides of the lock shaft. The isolation lock plate and the cam plate are sleeved on the isolation shaft to rotate coaxially, and the driving wheel plate and the ground lock plate are sleeved on The grounding shaft rotates coaxially, the isolating shaft is linked to the isolating knife, the grounding shaft is linked to the grounding knife, the outer periphery of the isolating locking plate and the grounding locking plate respectively form a plurality of locking grooves that cooperate with the isolating lock rod and the locking push rod, and the driving wheel The plate is provided with a piston, one end of the piston is linked to the circuit breaker closing detent, the isolation lock rod is sleeved with a return spring that pulls the isolation lock rod to the driving wheel plate, and the lock push rod is sleeved to pull the lock push rod. Return spring to the cam plate.
The five-proof interlocking mechanism for switch cabinets according to claim 1, characterized in that: the door closing shaft is arranged outside one end of the locking shaft, and the door closing shaft and the locking shaft are meshed and linked by bevel gears, and the door closing shaft is Equipped with a locking door panel.
The five-proof interlocking mechanism for switch cabinets according to claim 1 or 2, characterized in that: the isolation locking plate and the grounding locking plate are both provided with four locking grooves, and the four locking grooves are equiangular at 90° set up.
The five-proof interlocking mechanism for switchgear according to claim 1 or 2, characterized in that: the isolation shaft and the grounding shaft are both hexagonal shafts, the driving wheel plate, the cam plate, the isolation locking plate and the grounding locking plate The center of the corresponding to the hexagonal axis forms a hexagonal hole.
The five-proof interlocking mechanism for switch cabinets according to claim 1 or 2, characterized in that: the isolation lock rod and the lock push rod are formed with a relief groove for the lock shaft to pass through.
The five-proof interlocking mechanism for switch cabinets according to claim 1 or 2, characterized in that: the opening block is an opening bearing connected to the isolation lock rod.