CN117292993A - Automatic switching-on and switching-off device based on current feedback - Google Patents

Abstract

The invention discloses an automatic tripping and closing device based on current feedback, which belongs to the technical field of electric power facilities and includes a housing. A limit strip is fixedly installed on the side wall of the housing, and a limit slot is provided on the other side wall of the housing. , the inner wall of the limit groove is provided with a positioning hole, the size of the limit groove and the limit bar are adapted, the outer surface of the housing is provided with a reset component and an anti-separation component, and the inner wall of the limit bar is provided with a positioning component; the present invention By providing a reset component, when the rotating disc rotates, the threaded column will move the rotating disc toward the direction of the support plate under the action of the thread. At this time, the torsion spring is in a contracted state. When the limit plate is separated from the push plate, The rotating disk will return to its original position under the action of the torsion spring, automatically record the instantaneous current, facilitate the later inspection and repair of tripping and closing, and automatically reset after the current returns to normal, saving manual closing operation, thereby improving improve the efficiency of power transmission.

Description

Automatic tripping and closing device based on current feedback

Technical field

The invention belongs to the technical field of electric power facilities, and in particular relates to an automatic tripping and closing device based on current feedback.

Background technique

Automatic tripping and closing, also known as automatic reclosing, refers to a facility that uses mechanical devices or relay automatic devices to automatically reclose the circuit breaker after it is opened due to some fault. The circuit breaker is reclosed in one step according to the number of reclosures. And multiple reclosing; according to the number of phases, it is divided into three-phase and single-phase automatic reclosing; according to the use occasion, it is divided into single-side power supply and double-side power supply automatic reclosing.

A Chinese patent discloses an automatic reclosing device with a long service life (CN209562134U), which includes a first leakage module. Several fixed blocks are installed on both ends of the first leakage module, and limit plates are installed on both sides of the switch operating handle. , a first connecting block is installed on one side of the reclosing module, and a buckle is installed on the upper side of the reclosing module. The utility model is movablely connected to the reclosing module through the reclosing self-locking handle, so that the reclosing module has a self-locking function, preventing misoperation by non-professional users, and providing guarantee for the user's safety. The first leakage module is connected to the reclosing module through a buckle. The modules are movablely connected to facilitate the installation of leakage modules and reclosing modules. The screws and fixed blocks are movablely connected to facilitate installation and disassembly during maintenance. The production cost is low, the structure is novel, and the modular design is easy to install and maintain. It only needs to be plugged and spliced. Sufficient electrical clearance and creepage distance are of great help in EMC experiments. The current automatic tripping and closing does not record the current during use, so the instantaneous current cannot be known during a short circuit, and the existing automatic Although the trip and closing operation will be performed automatically, it will not automatically judge based on the magnitude of the current, which may easily cause closing failure. For this reason, an automatic trip and closing device based on current feedback is provided.

Contents of the invention

In order to solve the above problems, the present invention proposes a method that can automatically record the instantaneous current, facilitate the later inspection and repair of tripping and closing, and automatically reset after the current returns to normal, saving the manual closing operation, thereby improving the transmission efficiency. Electrical efficiency automatic tripping and closing device based on current feedback.

In order to achieve the above objects, the present invention adopts the following technical solutions:

An automatic tripping and closing device based on current feedback includes a shell, a limit strip is fixedly installed on the side wall of the shell, a limit slot is provided on the other side wall of the shell, and a positioning slot is provided on the inner wall of the limit slot. The size of the hole, the limit groove and the limit bar are adapted, the outer surface of the housing is provided with a reset component and an anti-separation component, and the inner wall of the limit bar is provided with a positioning component;

The reset assembly includes a mounting block and a rotating disk. The side wall of the mounting block is fixedly connected to the outer surface of the housing. A driving motor is fixedly installed on the other side wall of the mounting block. The output end of the driving motor is fixedly installed with a rotating cylinder. A push plate is fixedly installed on the outer surface of the rotating drum.

A limit plate is fixedly installed on the side wall of the rotating disk, and a threaded column is threadedly installed on the inner wall of the rotating disk. One end of the threaded column extends to the inside of the rotating cylinder, and one end of the rotating cylinder is rotationally connected to the side wall of the rotating disk.

A reset rod is fixedly installed on the outer surface of the rotating disk, a torsion spring is fixedly installed on the other side wall of the rotating disk, and the other end of the threaded column penetrates the inside of the torsion spring.

A support plate is fixedly installed on the outer surface of the housing. The side wall of the support plate is fixedly connected to the other end of the threaded column. One end of the torsion spring is fixedly connected to the side wall of the support plate. A stroke groove is provided on the side wall of the support plate.

A fixed rod is slidably installed on the inner wall of the stroke groove, and a switch is fixedly installed at one end of the fixed rod. One end of the switch is rotatably connected to the inner wall of the housing.

The anti-off component includes a positioning plate and a splint. The side wall of the positioning plate is fixedly connected to the outer surface of the housing. A limit rod is fixedly installed on the inner wall of the positioning plate. A pressure plate is slidably installed on the outer surface of the limit rod. The inner wall of the pressure plate A two-way threaded rod is installed on the upper thread.

A mounting plate is rotatably mounted on the outer surface of the two-way threaded rod. The upper surface of the mounting plate is fixedly connected to the inner wall of the top surface of the positioning plate. A telescopic air bag is fixedly installed on the side wall of the pressure plate, and a trachea is installed on the upper surface of the telescopic air bag.

One end of the trachea extends to the outside of the side wall of the pressure plate. A connecting pipe is installed on the outer surface of the trachea. One end of the connecting pipe is connected to an expansion air bag. The expansion air bag extends to the outside of the side wall of the positioning plate. Both ends of the bidirectional threaded rod They are all fixedly installed with a threaded rod, and a threaded plate is threadedly installed on the outer surface of the threaded rod. The upper surface of the threaded plate is fixedly connected to the top inner wall of the plywood, and one end of the threaded rod extends to the outside of the side wall of the plywood.

The positioning assembly includes a moving rod. One end of the moving rod is fixed with a fixed plate. A telescopic spring is fixedly installed on the side wall of the fixed plate. One end of the telescopic spring is fixedly connected to the inner wall of the limiting bar. The other end of the moving rod extends to the outside of the side wall of the limit bar.

A bump is fixedly installed on the upper surface of the moving rod, a positioning spring is fixedly installed on the inner wall of the bottom surface of the limit bar, one end of the positioning spring is fixedly installed with a connecting plate, and a positioning pin is fixedly installed on the side wall of the connecting plate. The positioning pin The lower surface is slidingly connected to the upper surface of the bump.

The beneficial effects of the present invention are:

1. In the present invention, by providing a reset component, when a short circuit occurs in the line, the switch will automatically trip. At the same time, the current monitor in the housing will record the instantaneous current. When the current returns to the appropriate range, the controller will The drive motor is controlled to drive the rotating cylinder to rotate. When the rotating cylinder rotates, it will drive the push plate to rotate synchronously. At this time, the rotating disk is under the limit of the limit plate, and the push plate will drive the rotating disk outside the threaded column through the limit plate. The surface rotates, and when the rotating disk rotates, it will drive the reset rod to move. At this time, the reset rod will drive the fixed rod to move in the stroke groove. When the fixed rod moves, the switch is opened, and the threaded column plays a role in the thread when the rotating disk rotates. The rotating disc will move towards the direction of the support plate. At this time, the torsion spring is in a contracted state. When the limit plate is separated from the push plate, the rotating disc will return to its original position under the action of the torsion spring and automatically control the instantaneous current. Recording facilitates subsequent inspection and repair of tripping and closing, and automatically resets after the current returns to normal, saving manual closing operations and thus improving the efficiency of power transmission.

2. In the present invention, by providing an anti-separation component, when the circuit is installed on the shell, the circuit is passed between the positioning plate and the splint, and then the threaded rod is rotated according to the thickness of the circuit. At this time, the threaded rod is threaded on the outer surface. Under the action, the threaded plate will move, thereby adjusting the position of the clamping plate. When the threaded rod rotates, it will drive the two-way threaded rod to rotate on the inner wall of the mounting plate. At this time, the two-way threaded rod passes the thread on the outer surface to make the pressure plate in the limit position. Move the position rod under the limit to squeeze the telescopic air bag. The gas in the squeezed telescopic air bag will flow from the connecting pipe to the expansion air bag through the trachea. At this time, the expansion air bag will wrap the circuit after it is inflated. , thereby protecting the line and preventing the circuit from falling off due to the jump of the switch when a short circuit occurs, thereby reducing the efficiency of power transmission. While preventing the line from falling off, it also protects the corners of the line and reduces the wear and tear on the line. Improve the service life of the line.

3. In the present invention, a positioning component is provided to align the limiting bar on one housing with the limiting groove on the other housing, and then insert the limiting bar into the limiting groove. When the positioning pin and the limiting groove After the positioning holes in the slot are aligned, one end of the positioning pin will be clamped into the positioning hole in the limit slot through the connecting plate under the action of the positioning spring, thereby fixing the two shells. When the two shells need to be When the bodies are separated, squeeze the moving rod into the limit bar. At this time, the lowest end of the bump will move below the positioning pin. Since the positioning pin loses the squeeze of the bump, the positioning spring will drive the positioning pin through the connecting plate. Shrink into the limit bar to disengage the positioning pin from the positioning hole, and then separate the limit bar from the limit groove to separate the two shells, which facilitates the disassembly and assembly of the tripping and closing circuit and reduces the difficulty of disassembly and assembly. , when damage occurs later, individual replacements can be made, which not only reduces the difficulty of maintenance, but also saves usage costs.

Description of drawings

Figure 1 is a schematic three-dimensional structural diagram of an automatic tripping and closing device based on current feedback.

Figure 2 is an enlarged structural diagram of position A in Figure 1 of the specification.

Figure 3 is a schematic three-dimensional structural diagram of the automatic tripping and closing device based on current feedback from another angle.

Figure 4 is an exploded structural diagram of the positioning component in the automatic tripping and closing device based on current feedback.

Figure 5 is an exploded structural diagram of the reset component in the automatic tripping and closing device based on current feedback.

Figure 6 is a schematic diagram of the internal structure of the anti-trip component in the automatic tripping and closing device based on current feedback.

Figure 7 is an enlarged structural diagram of position B in Figure 6 of the specification.

illustration:

1. Housing; 2. Limit bar; 3. Positioning component; 31. Moving rod; 32. Fixed plate; 33. Telescopic spring; 34. Bump; 35. Positioning pin; 36. Connecting plate; 37. Positioning spring ; 4. Switch; 5. Fixed rod; 6. Support plate; 7. Stroke groove; 8. Limit groove; 9. Anti-falling component; 91. Positioning plate; 92. Limit rod; 93. Pressure plate; 94. Telescopic Air bag; 95. Trachea; 96. Splint; 97. Expansion air bag; 98. Installation plate; 99. Bidirectional threaded rod; 910. Threaded rod; 911. Threaded plate; 10. Reset component; 101. Installation block; 102. Drive motor ; 103. Rotating cylinder; 104. Push plate; 105. Rotating plate; 106. Limiting plate; 107. Reset rod; 108. Torsion spring; 109. Threaded column.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Referring to Figure 1-7, the automatic tripping and closing device based on current feedback includes a housing 1. A limit strip 2 is fixedly installed on the side wall of the housing 1, and a limit slot is provided on the other side wall of the housing 1. 8. The inner wall of the limit groove 8 is provided with a positioning hole. The limit groove 8 matches the size of the limit bar 2. The outer surface of the housing 1 is provided with a reset component 10 and an anti-separation component 9. The inner wall of the limit bar 2 is provided with a positioning hole. A positioning component 3 is provided on the top;

The reset assembly 10 includes a mounting block 101 and a rotating disk 105. The side wall of the mounting block 101 is fixedly connected to the outer surface of the housing 1. A driving motor 102 is fixedly mounted on the other side wall of the mounting block 101. The driving motor 102 A rotating cylinder 103 is fixedly installed at the output end. A push plate 104 is fixedly installed on the outer surface of the rotating cylinder 103. A limit plate 106 is fixedly installed on the side wall of the rotating disk 105. A threaded column 109 is threadedly installed on the inner wall of the rotating disk 105. One end of the column 109 extends to the inside of the rotating cylinder 103. One end of the rotating cylinder 103 is rotationally connected to the side wall of the rotating disk 105. A reset rod 107 is fixedly installed on the outer surface of the rotating disk 105, and is fixed on the other side wall of the rotating disk 105. A torsion spring 108 is installed. The other end of the threaded column 109 runs through the inside of the torsion spring 108. A support plate 6 is fixedly installed on the outer surface of the housing 1. The side wall of the support plate 6 is fixedly connected to the other end of the threaded column 109. The torsion spring One end of 108 is fixedly connected to the side wall of the support plate 6. The side wall of the support plate 6 is provided with a travel groove 7. A fixed rod 5 is slidably installed on the inner wall of the travel groove 7. One end of the fixed rod 5 is fixedly equipped with a switch 4. One end of the switch 4 is rotatably connected to the inner wall of the housing 1 .

The specific embodiment is: when a short circuit occurs in the line, the switch 4 will automatically trip, and the current monitor in the housing 1 will record the instantaneous current. When the current returns to an appropriate range, the controller will control the drive motor. 102 drives the rotating cylinder 103 to rotate. When the rotating cylinder 103 rotates, it will drive the push plate 104 to rotate synchronously. At this time, the rotating disk 105 is limited by the limiting plate 106, and the pushing plate 104 will drive the rotating disk through the limiting plate 106. 105 rotates on the outer surface of the threaded column 109. When the rotating disk 105 rotates, it will drive the reset rod 107 to move. At this time, the reset rod 107 will drive the fixed rod 5 to move in the travel groove 7. When the fixed rod 5 moves, the switch 4 Open, and when the rotating disk 105 is rotating, the threaded column 109 will move the rotating disk 105 toward the direction of the supporting plate 6 under the action of the thread. At this time, the torsion spring 108 is in a contracted state. When the limiting plate 106 is separated from the blocking of the push plate 104 , the rotating disk 105 will return to its original position under the action of the torsion spring 108 to prepare for the next reset.

The anti-separation assembly 9 includes a positioning plate 91 and a splint 96. The side wall of the positioning plate 91 is fixedly connected to the outer surface of the housing 1. A limiting rod 92 is fixedly installed on the inner wall of the positioning plate 91. The outer surface of the limiting rod 92 A pressure plate 93 is slidably installed. A two-way threaded rod 99 is threadedly installed on the inner wall of the pressure plate 93. A mounting plate 98 is mounted on the outer surface of the two-way threaded rod 99. The upper surface of the mounting plate 98 is fixedly connected to the top inner wall of the positioning plate 91. A telescopic air bag 94 is fixedly installed on the side wall of the pressure plate 93. A trachea 95 is connected to the upper surface of the telescopic air bag 94. One end of the trachea 95 extends to the outside of the side wall of the pressure plate 93. A connecting pipe is connected to the outer surface of the trachea 95. One end of the tube is connected and installed with an expansion air bag 97. The expansion air bag 97 extends to the outside of the side wall of the positioning plate 91. Both ends of the two-way threaded rod 99 are fixedly installed with threaded rods 910. The outer surface of the threaded rod 910 is threadedly installed with a threaded plate 911. , the upper surface of the threaded plate 911 is fixedly connected to the top inner wall of the clamping plate 96 , and one end of the threaded rod 910 extends to the outside of the side wall of the clamping plate 96 .

The specific embodiment is: when installing the circuit in the housing 1, pass the circuit between the positioning plate 91 and the clamping plate 96, and then rotate the threaded rod 910 according to the thickness of the circuit. At this time, the threaded rod 910 is under the action of the thread on the outer surface. The threaded plate 911 will move, thereby adjusting the position of the clamping plate 96. When the threaded rod 910 rotates, the two-way threaded rod 99 will be driven to rotate on the inner wall of the mounting plate 98. At this time, the two-way threaded rod 99 passes through the threads on the outer surface. The pressure plate 93 is moved under the limit of the limiting rod 92 to squeeze the telescopic airbag 94. The gas in the squeezed telescopic airbag 94 will flow from the connecting pipe to the expansion airbag 97 through the air pipe 95. At this time After the inflatable air bag 97 is inflated, it will wrap the circuit to protect the circuit.

The positioning assembly 3 includes a moving rod 31. One end of the moving rod 31 is fixed with a fixed plate 32. A telescopic spring 33 is fixedly installed on the side wall of the fixed plate 32. One end of the telescopic spring 33 is fixed to the inner wall of the limiting bar 2. connection, the other end of the moving rod 31 extends to the outside of the side wall of the limiting bar 2, the upper surface of the moving rod 31 is fixed with a bump 34, and the bottom inner wall of the limiting bar 2 is fixedly installed with a positioning spring 37, the positioning spring 37 A connecting plate 36 is fixedly installed on one end of the connecting plate 36, a positioning pin 35 is fixedly installed on the side wall of the connecting plate 36, and the lower surface of the positioning pin 35 is slidingly connected to the upper surface of the bump 34.

The specific embodiment is: align the limiting bar 2 on one housing 1 with the limiting groove 8 on the other housing 1, and then insert the limiting bar 2 into the limiting groove 8. When the positioning pin 35 and the limiting groove 8, the limiting bar 2 is aligned with the limiting groove 8. After the positioning holes in the positioning groove 8 are aligned, one end of the positioning pin 35 will be clamped into the positioning hole in the positioning groove 8 through the connecting plate 36 under the action of the positioning spring 37, thereby fixing the two housings 1 , when it is necessary to separate the two housings 1, squeeze the moving rod 31 into the limiting bar 2. At this time, the lowest end of the bump 34 will move below the positioning pin 35, because the positioning pin 35 loses the bump 34 squeezing, so the positioning spring 37 will drive the positioning pin 35 to shrink into the limiting bar 2 through the connecting plate 36, thereby disengaging the positioning pin 35 from the positioning hole, and then separating the limiting bar 2 from the limiting groove 8, thereby Separate the two housings 1 .

Working principle: Align the limit bar 2 on one housing 1 with the limit groove 8 on the other housing 1, and then insert the limit bar 2 into the limit groove 8. When the positioning pin 35 and the limit groove 8 After the positioning holes in the housing are aligned, one end of the positioning pin 35 will be clamped into the positioning hole in the limiting groove 8 through the connecting plate 36 under the action of the positioning spring 37, thereby fixing the two housings 1. When needed When separating the two housings 1, squeeze the moving rod 31 into the limiting bar 2. At this time, the lowest end of the bump 34 will move below the positioning pin 35, because the positioning pin 35 loses the squeeze of the bump 34. , therefore the positioning spring 37 will drive the positioning pin 35 to shrink into the limiting bar 2 through the connecting plate 36, thereby disengaging the positioning pin 35 from the positioning hole, and then separate the limiting bar 2 and the limiting groove 8, thereby separating the two The housing 1 is separated. When installing the circuit in the housing 1, pass the circuit between the positioning plate 91 and the splint 96, and then rotate the threaded rod 910 according to the thickness of the circuit. At this time, the threaded rod 910 will The threaded plate 911 is moved to adjust the position of the clamping plate 96. When the threaded rod 910 rotates, the two-way threaded rod 99 will be driven to rotate on the inner wall of the mounting plate 98. At this time, the two-way threaded rod 99 rotates through the threads on the outer surface. The pressure plate 93 moves under the limit of the limit rod 92, thereby squeezing the telescopic air bag 94. The gas in the squeezed telescopic air bag 94 will flow from the connecting pipe to the expansion air bag 97 through the trachea 95, and at this time it will expand. After the air bag 97 is inflated, it will wrap the circuit to protect the circuit. When a short circuit occurs in the circuit, the switch 4 will automatically trip. At the same time, the current monitor in the housing 1 will record the instantaneous current. When the current is restored, After reaching the appropriate range, the controller will control the driving motor 102 to drive the rotating drum 103 to rotate. When the rotating drum 103 rotates, it will drive the push plate 104 to rotate synchronously. At this time, the rotating plate 105 is limited by the limiting plate 106 and pushes The plate 104 will drive the rotating disk 105 to rotate on the outer surface of the threaded column 109 through the limiting plate 106. When the rotating disk 105 rotates, it will drive the reset rod 107 to move. At this time, the reset rod 107 will drive the fixed rod 5 in the travel groove 7 Move, when the fixed rod 5 moves, the switch 4 is opened, and when the rotating disk 105 rotates, the threaded column 109 will move the rotating disk 105 toward the direction of the support plate 6 under the action of the thread. At this time, the torsion spring 108 is in a contracted state. When the limiting plate 106 is released from the blocking of the push plate 104, the rotating disk 105 will return to its original position under the action of the torsion spring 108 to prepare for the next reset.

Claims (10)

1. An automatic tripping and closing device based on current feedback, including a housing (1), a limit bar (2) fixedly installed on the side wall of the housing (1), and a limit bar (2) on the other side wall of the housing (1). A limiting groove (8) is provided, and a positioning hole is provided on the inner wall of the limiting groove (8). The limiting groove (8) matches the size of the limiting bar (2), and is characterized in that: the outer surface of the housing (1) The surface is provided with a reset component (10) and an anti-separation component (9), and the inner wall of the limit bar (2) is provided with a positioning component (3); The reset assembly (10) includes a mounting block (101) and a rotating disk (105). The side wall of the mounting block (101) is fixedly connected to the outer surface of the housing (1). The other side wall of the mounting block (101) A driving motor (102) is fixedly installed on the upper end of the driving motor (102), a rotating cylinder (103) is fixedly installed at the output end of the driving motor (102), and a push plate (104) is fixedly installed on the outer surface of the rotating cylinder (103). 2. The automatic tripping and closing device based on current feedback according to claim 1, characterized in that a limit plate (106) is fixedly installed on the side wall of the rotating disk (105), and the inner wall of the rotating disk (105) A threaded column (109) is installed on the upper thread. One end of the threaded column (109) extends to the inside of the rotating barrel (103). One end of the rotating barrel (103) is rotationally connected to the side wall of the rotating disk (105). 3. The automatic tripping and closing device based on current feedback according to claim 2, characterized in that a reset rod (107) is fixedly installed on the outer surface of the rotating disk (105), and another part of the rotating disk (105) A torsion spring (108) is fixedly installed on the side wall, and the other end of the threaded column (109) penetrates the inside of the torsion spring (108). 4. The automatic tripping and closing device based on current feedback according to claim 3, characterized in that a support plate (6) is fixedly installed on the outer surface of the housing (1), and the side wall of the support plate (6) is in contact with the The other end of the threaded column (109) is fixedly connected, and one end of the torsion spring (108) is fixedly connected with the side wall of the support plate (6). A travel groove (7) is provided on the side wall of the support plate (6). 5. The automatic tripping and closing device based on current feedback according to claim 4, characterized in that a fixed rod (5) is slidably installed on the inner wall of the stroke groove (7), and one end of the fixed rod (5) is fixed. A switch (4) is installed, and one end of the switch (4) is rotationally connected to the inner wall of the housing (1). 6. The automatic tripping and closing device based on current feedback according to claim 5, characterized in that the anti-separation component (9) includes a positioning plate (91) and a clamping plate (96), and the side of the positioning plate (91) The wall is fixedly connected to the outer surface of the housing (1), a limit rod (92) is fixedly installed on the inner wall of the positioning plate (91), and a pressure plate (93) is slidably installed on the outer surface of the limit rod (92). The pressure plate (93) ) is threaded with a bidirectional threaded rod (99) on the inner wall. 7. The automatic tripping and closing device based on current feedback according to claim 6, characterized in that a mounting plate (98) is rotatably mounted on the outer surface of the two-way threaded rod (99), and the upper surface of the mounting plate (98) The surface is fixedly connected to the top inner wall of the positioning plate (91), a telescopic air bag (94) is fixedly installed on the side wall of the pressure plate (93), and a trachea (95) is installed on the upper surface of the telescopic air bag (94). 8. The automatic tripping and closing device based on current feedback according to claim 7, characterized in that one end of the air pipe (95) extends to the outside of the side wall of the pressure plate (93), and the outer surface of the air pipe (95) is connected A connecting pipe is installed, one end of the connecting pipe is connected to the expansion airbag (97), the expansion airbag (97) extends to the outside of the side wall of the positioning plate (91), and both ends of the two-way threaded rod (99) are fixedly installed with threaded rods (910), the outer surface of the threaded rod (910) is threaded with a threaded plate (911), the upper surface of the threaded plate (911) is fixedly connected to the top inner wall of the splint (96), and one end of the threaded rod (910) extends to Outside the side wall of the plywood (96). 9. The automatic tripping and closing device based on current feedback according to claim 8, characterized in that the positioning component (3) includes a moving rod (31), and a fixed plate (31) is fixedly installed on one end of the moving rod (31). 32), a telescopic spring (33) is fixedly installed on the side wall of the fixed plate (32), one end of the telescopic spring (33) is fixedly connected to the inner wall of the limit bar (2), and the other end of the moving rod (31) extends to the outside of the side wall of the limit bar (2). 10. The automatic tripping and closing device based on current feedback according to claim 9, characterized in that a bump (34) is fixedly installed on the upper surface of the moving rod (31), and the bottom surface of the limit bar (2) A positioning spring (37) is fixedly installed on the inner wall. One end of the positioning spring (37) is fixedly installed with a connecting plate (36). A positioning pin (35) is fixedly installed on the side wall of the connecting plate (36). The positioning pin (35) The lower surface is slidingly connected with the upper surface of the bump (34).