An automatic reset device for the AC load circuit breaker of multiple unit trains

Abstract

The present invention belongs to the technical field of auxiliary accessories for EMUs, and relates to an automatic reset device for an AC load circuit breaker of an EMU, which includes a housing, a triggering mechanism, a delay driving mechanism, a transmission mechanism, and a flipping fork for resetting and closing the disconnected circuit breaker. The triggering mechanism is connected to the delay driving mechanism, and the delay driving mechanism is connected to the flipping fork. When the circuit breaker is disconnected, the handle of the circuit breaker drops and contacts the triggering mechanism, and the triggering mechanism triggers the delay driving mechanism to operate. The delay driving mechanism drives the flipping fork to move upward to reset and close the disconnected circuit breaker. This device compensates through various chutes and springs, delays by means of gas damping, and realizes the purpose of delaying the closing of the circuit breaker of the device through a linkage mechanism. Each time the device is reset, only one action of closing the circuit breaker is executed.

Description

Technical Field

[0001] The invention belongs to the technical field of auxiliary accessories for EMUs, and relates to an automatic reset device for an AC load circuit breaker of an EMU. Background Art

[0002] In China, an increasing number of CRH series EMUs and standard EMUs are in operation. Especially since the operation of CRH380B-type EMUs, the AC load circuit breaker of the auxiliary power supply system of this type of EMU is usually installed in the equipment compartment under the vehicle. The AC load circuit breaker has tripped many times due to occasional transient or transient overvoltage / overcurrent of the AC load. During the train operation, the circuit breaker cannot be reset, and it can only be closed when the EMU enters the depot for maintenance. Usually, when the AC load circuit breaker of the auxiliary power supply system trips, it is often accompanied by the shutdown of the main power traction system, which will inevitably affect the running speed of the EMU and cause delays. Therefore, it is particularly important to develop a device that can automatically reset the AC load circuit breaker of the CRH380B-type EMU auxiliary power supply system. If there is a fault in the AC load equipment, the circuit breaker will automatically trip protectively again and will not close again. If there is an occasional transient or transient overvoltage / overcurrent, through this device, the circuit breaker will be automatically reset with a time delay once and will not trip again, restoring the normal power supply state of the AC load of the EMU auxiliary system, thus ensuring the safe and on-time operation of the EMU. Summary of the Invention

[0003] The purpose of the invention is to provide an automatic reset device for an AC load circuit breaker of an EMU, and solve the problem that the circuit breaker cannot be reset during the train operation when it trips.

[0004] The specific implementation process of the invention is as follows:

[0005] An automatic reset device for an AC load circuit breaker of an EMU includes a housing, a trigger mechanism, a time-delay driving mechanism, a transmission mechanism, and a flipping fork for resetting and closing the tripped circuit breaker. The trigger mechanism is connected to the time-delay driving mechanism, and the time-delay driving mechanism is connected to the flipping fork. When the circuit breaker is tripped, the handle of the circuit breaker drops and contacts the trigger mechanism, and the trigger mechanism triggers the time-delay driving mechanism to operate. The time-delay driving mechanism drives the flipping fork to move upward, resetting and closing the tripped circuit breaker.

[0006] Furthermore, the housing is in a box structure and is composed of a front panel, a rear panel, a top panel, a bottom panel, a left panel, and a right panel.

[0007] Further, the triggering mechanism includes a triggering fork, a clamping member, and a torsion spring. The triggering fork is installed on a shaft provided inside the housing. A torsion spring is provided on the shaft. One end of the triggering fork located inside the housing is provided with a protrusion. A through hole matching the protrusion is provided at the right end of the clamping member. The protrusion is inserted into the through hole. A clamping hole for cooperating with the delay driving mechanism is provided in the middle of the clamping member. The triggering fork has a special-shaped structure. When the circuit breaker is disconnected, the handle of the circuit breaker contacts the triggering mechanism.

[0008] Further, a triggering fork sliding groove is provided on the front panel. The front part of the triggering fork penetrates through the triggering fork sliding groove and is exposed outside the front panel. The triggering fork can slide up and down in the triggering fork sliding groove.

[0009] Further, the delay driving mechanism includes a delay cylinder, a piston, a piston rod, a first compression spring, and a throttle needle valve. The delay cylinder is installed on the bottom panel. A piston is provided inside the delay cylinder. An O-ring for maintaining airtightness is provided on the piston. A cylinder head is provided on the delay cylinder. The clamping member is located below the cylinder head. The lower end of the piston rod sequentially penetrates through the top panel of the housing, the cylinder head, and the clamping hole in the middle of the clamping member and is fixedly connected to the piston. A first compression spring is sleeved on the piston rod between the top panel of the housing and the cylinder head. A throttle needle valve for adjusting the air intake and exhaust speed is provided at the bottom of the delay cylinder. A second compression spring is provided on the throttle needle valve. The upper end of the piston rod is exposed above the top panel of the housing. A reset button is installed at the upper end of the piston rod.

[0010] Further, a clamping groove is provided on the piston rod. The clamping hole is a special-shaped hole. The aperture L of the left part of the special-shaped hole is larger than the outer diameter D of the piston rod, enabling the piston rod to slide freely in the left part of the special-shaped hole. The aperture M of the right part of the special-shaped hole is smaller than the outer diameter of the piston rod. The right part of the special-shaped hole matches the clamping groove, enabling the piston rod to be clamped in the right part of the clamping hole.

[0011] Further, the transmission mechanism includes a cross arm and a suspension rod. An installation hole is provided at one end of the cross arm. The piston rod penetrates through the installation hole at one end of the cross arm. The cross arm is located above the first compression spring. The other end of the cross arm is fixedly connected to one end of the suspension rod. The cross arm and the suspension rod are perpendicular structures. The other end of the suspension rod is hinged to the flipping fork. A partition is provided between the suspension rod and the torsion spring. The torsion spring contacts the partition.

[0012] Further, the transmission mechanism further includes a snap ring. A hole for facilitating the installation of the snap ring is provided at the end of the cross arm with the installation hole. A groove matching the snap ring is also provided on the piston rod. The cross arm is fixed to the position of the piston rod by the snap ring being stuck in the groove.

[0013] Furthermore, the flipping fork is of an L-shaped structure, including a vertical portion and a horizontal portion. The vertical portion and the horizontal portion are integrally formed. The other end of the hanging rod is hinged to the flipping fork at the connection of the vertical portion and the horizontal portion. First guiding columns are symmetrically arranged at the upper end of the vertical portion, and second guiding columns are symmetrically arranged at the lower end of the vertical portion. Y-shaped sliding grooves are provided on both the front panel and the partition board. The first guiding columns and the second guiding columns can slide in the Y-shaped sliding grooves. The right panel is provided with a flipping fork sliding groove for the horizontal portion of the flipping fork to slide. The length range of the flipping fork sliding groove is such that the lower end of the flipping fork sliding groove is lower than the lower end of the handle after the circuit breaker is disconnected, and the upper end of the flipping fork sliding groove is higher than the lower end of the handle after the circuit breaker is reset. The horizontal portion of the flipping fork can slide up and down in the flipping fork sliding groove. During the upward sliding process of the horizontal portion of the flipping fork in the flipping fork sliding groove, it can contact the handle of the circuit breaker and push the handle upward.

[0014] Furthermore, two buckles are symmetrically arranged on the rear panel. The buckles are connected to the rear panel by screws. The buckles can be stuck on the rail for installing the circuit breaker. The buckle consists of a fixing plate, a movable plate, and a third compression spring. A connecting column is arranged on the fixing plate. A movable groove is arranged on the movable plate, and a third compression spring is arranged in the movable groove. The connecting column is inserted between the inner wall of the movable groove and one end face of the third compression spring.

[0015] The positive effects of the present invention are as follows:

[0016] (1) The circuit breaker can be reset with a time delay after being accidentally disconnected.

[0017] (2) After the operation of closing the circuit breaker is completed, it does not affect the circuit breaker from being disconnected again due to circuit problems.

[0018] (3) The operation of resetting the circuit breaker is only executed once, avoiding damage to the overall circuit caused by the disconnection of the circuit breaker being a real fault.

[0019] (4) The device adopts a pure mechanical structure and does not require an external power supply.

[0020] (5) After the device is released once, it can be restored to the initial state by pressing the pressing reset button.

[0021] (6) The device compensates through a variety of sliding grooves and springs, delays by means of gas damping, and realizes the purpose of delaying the closing of the circuit breaker through a connecting rod mechanism. Each time the device is reset, only one operation of closing the circuit breaker is executed. Description of the Drawings

[0022] Figure 1 It is a schematic external view of the automatic reset device for the AC load circuit breaker of the present invention for EMUs.

[0023] Figure 2This is the usage state diagram of the automatic reset device for the AC load circuit breaker of the EMU, in cooperation with the circuit breaker;

[0024] Figure 3 This is the overall structural schematic diagram of the automatic reset device for the AC load circuit breaker of the EMU;

[0025] Figure 4 This is the axonometric view structural schematic diagram of the automatic reset device for the AC load circuit breaker of the EMU after removing the outer shell;

[0026] Figure 5 This is the state schematic diagram of the automatic reset device for the AC load circuit breaker of the EMU at different positions during the operation process. (1) Un-triggered state, (2) State after triggering to the trigger fork after the circuit breaker handle drops, (3) State of the flipping fork moving upward, (4) State where the flipping fork pushes the circuit breaker handle to the closed state; (5) State where the flipping fork automatically flips and is partially received in the outer shell;

[0027] Figure 6 This is the structural schematic diagram of the piston rod;

[0028] Figure 7 This is the sectional view of the usage state of the piston rod;

[0029] Figure 8 This is the structural schematic diagram of the throttle needle valve;

[0030] Figure 9 This is the shape schematic diagram of the card hole;

[0031] Figure 10 This is the partial enlarged usage state schematic diagram of the throttle needle valve;

[0032] In the figure, 1 is the housing, 11 is the front panel, 111 is the trigger fork chute, 112 is the Y-shaped chute, 112-1 is the arc chute, 112-2 is the straight chute, 113 is the flip fork chute, 114 is the partition, 12 is the rear panel, 121 is the buckle, 122 is the fixed plate, 123 is the movable plate, 124 is the third compression spring, 125 is the connecting column, 126 is the movable slot, 13 is the top panel, 14 is the bottom panel, 15 is the left panel, 16 is the right panel, 2 is the trigger mechanism, 21 is the trigger fork, 22 is the clamping part, 221 is the clamping hole, L is the aperture of the left part of the special-shaped hole, M is the aperture of the right part of the special-shaped hole, D is the outer diameter of the piston rod, 23 is the torsion spring, 24 is the shaft, 25 is the protrusion, 26 is the through hole, 3 is the delay driving mechanism, 31 is the delay cylinder, 32 is the piston, 321 is the O-ring, 33 is the piston rod, 331 is the clamping groove, 332 is the groove, 34 is the first compression spring, 35 is the throttle needle valve, 351 is the second compression spring, 36 is the cylinder head, 4 is the transmission mechanism, 41 is the cross arm, 42 is the suspension rod, 43 is the spring retaining ring, 5 is the flip fork, 51 is the vertical part, 511 is the first guiding column, 512 is the second guiding column, 52 is the horizontal part, 6 is the circuit breaker, 61 is the handle, 7 is the reset button, 8 is the track, H1 is the distance between the first guiding column and the second guiding column, H2 is the distance from the fork of the straight chute to the top of the straight chute, A is the fork of the straight chute, B is the top of the straight chute. Detailed implementation mode

[0033] The present invention will be further described below in conjunction with embodiments.

[0034] In order to solve the problem that the circuit breaker cannot be reset during the train operation when it trips, the present invention provides an automatic reset device for the AC load circuit breaker of the EMU.

[0035] Embodiment 1

[0036] The automatic reset device for the AC load circuit breaker of the EMU in this embodiment includes a housing 1, a trigger mechanism 2, a delay driving mechanism 3, a transmission mechanism 4, and a flip fork 5 for resetting and closing the disconnected circuit breaker. The trigger mechanism 2 is connected to the delay driving mechanism 3, and the delay driving mechanism 3 is connected to the flip fork 5. When the circuit breaker 6 is disconnected, the handle 61 of the circuit breaker 6 drops and contacts the trigger mechanism 2. The trigger mechanism 2 triggers the delay driving mechanism 3 to operate, and the delay driving mechanism 3 drives the flip fork 5 to move upward to reset and close the disconnected circuit breaker 6.

[0037] Embodiment 2

[0038] The automatic reset device for the AC load circuit breaker of the multiple unit train in this embodiment includes a housing 1, a trigger mechanism 2, a delay driving mechanism 3, a transmission mechanism 4, and a flipping fork 5 for resetting and closing the disconnected circuit breaker. The trigger mechanism 2 is connected to the delay driving mechanism 3, and the delay driving mechanism 3 is connected to the flipping fork 5. When the circuit breaker 6 is disconnected, the handle 61 of the circuit breaker 6 drops to contact the trigger mechanism 2, and the trigger mechanism 2 triggers the delay driving mechanism 3 to operate. The delay driving mechanism 3 drives the flipping fork 5 to move upward to reset and close the disconnected circuit breaker 6.

[0039] Furthermore, the housing 1 is a box structure and is composed of a front panel 11, a rear panel 12, a top panel 13, a bottom panel 14, a left panel 15, and a right panel 16.

[0040] Furthermore, the trigger mechanism 2 includes a trigger fork 21, a clamping member 22, and a torsion spring 23. The trigger fork 21 is installed on a shaft 24 arranged inside the housing 1, and the torsion spring 23 is arranged on the shaft 24. One end of the trigger fork 21 located inside the housing 1 is provided with a protrusion 25. The right end of the clamping member 22 is provided with a through hole 26 matching the protrusion 25, and the protrusion 25 is inserted into the through hole 26. A clamping hole 221 for cooperating with the delay driving mechanism 3 is arranged in the middle of the clamping member 22. The trigger fork 21 is of a special-shaped structure. When the circuit breaker 6 is disconnected, the handle 61 of the circuit breaker 6 contacts the trigger mechanism 2. A trigger fork sliding groove 111 is arranged on the front panel 11. The front part of the trigger fork 21 penetrates through the trigger fork sliding groove 111 and is exposed outside the front panel 11, and the trigger fork 21 can slide up and down in the trigger fork sliding groove 111.

[0041] Further, the delay driving mechanism 3 includes a delay cylinder 31, a piston 32, a piston rod 33, a first compression spring 34, and a throttle needle valve 35. The delay cylinder 31 is installed on the bottom panel 14. A piston 32 is arranged inside the delay cylinder 31. An O-ring 321 for maintaining airtightness is arranged on the piston 32. A cylinder head 36 is arranged on the delay cylinder 31. The clamping member 22 is located below the cylinder head 36. The lower end of the piston rod 33 sequentially penetrates through the top panel 13 of the housing 1, the cylinder head 36, and the clamping hole 221 in the middle of the clamping member 22 and is fixedly connected to the piston 32. A first compression spring 34 is sleeved on the piston rod 33 between the top panel 13 of the housing 1 and the cylinder head 36. A throttle needle valve 35 for adjusting the air intake and exhaust speed is arranged at the bottom of the delay cylinder 31. A second compression spring 351 is arranged on the throttle needle valve 35. The upper end of the piston rod 33 is exposed above the top panel 13 of the housing 1, and a reset button 7 is installed at the upper end of the piston rod 33. A clamping groove 331 is arranged on the piston rod 33. The clamping hole 221 is a special-shaped hole. The aperture L of the left part of the special-shaped hole is larger than the outer diameter D of the piston rod 33, so that the piston rod 33 can slide freely in the left part of the special-shaped hole. The aperture M of the right part of the special-shaped hole is smaller than the outer diameter of the piston rod 33, and the right part of the special-shaped hole matches the clamping groove 331, so that the piston rod 33 can be clamped at the right part of the clamping hole 221.

[0042] Further, the transmission mechanism 4 includes a cross arm 41 and a suspension rod 42. An installation hole is arranged at one end of the cross arm 41. The piston rod 33 penetrates through the installation hole at one end of the cross arm 41. The cross arm 41 is located above the first compression spring 34. The other end of the cross arm 41 is fixedly connected to one end of the suspension rod 42. The cross arm 41 and the suspension rod 42 are in a vertical structure. The other end of the suspension rod 42 is hinged to the flipping fork 5. A partition plate 114 is arranged between the suspension rod 42 and the torsion spring 23, and the torsion spring 23 is in contact with the partition plate 114. The transmission mechanism 4 further includes a snap ring 43. A hole for conveniently installing the snap ring 43 is arranged at the end of the cross arm 41 with the installation hole. A groove 332 matching the snap ring 43 is also arranged on the piston rod 33. The cross arm 41 is clamped in the groove 332 through the snap ring 43 to fix the position of the cross arm 41 and the piston rod 33.

[0043] Further, the flipping fork 5 is of an L-shaped structure, including a vertical portion 51 and a horizontal portion 52. The vertical portion 51 and the horizontal portion 52 are integrally formed structures. The other end of the hanging rod 42 and the hinged position of the flipping fork 5 are the connection position of the vertical portion 51 and the horizontal portion 52. First guiding columns 511 are symmetrically arranged at the upper end of the vertical portion 51, and second guiding columns 512 are symmetrically arranged at the lower end of the vertical portion 51. Y-shaped sliding grooves 112 are arranged on both the front panel 11 and the partition plate 114. The first guiding columns 511 and the second guiding columns 512 can slide within the Y-shaped sliding grooves 112. The right panel 16 is provided with a flipping fork sliding groove 113 for the horizontal portion 52 of the flipping fork 5 to slide. The length range of the flipping fork sliding groove 113 is that the lower end of the flipping fork sliding groove 113 is lower than the lower end of the handle 61 of the circuit breaker 6 after it is disconnected, and the upper end of the flipping fork sliding groove 113 is higher than the lower end of the handle 61 of the circuit breaker 6 after it is reset. The horizontal portion 52 of the flipping fork 5 can slide up and down within the flipping fork sliding groove 113. During the upward sliding process of the horizontal portion 52 of the flipping fork 5 within the flipping fork sliding groove 113, it can contact the handle 61 of the circuit breaker 6 and push the handle 61 to move upward.

[0044] Embodiment 3

[0045] The automatic reset device for the AC load circuit breaker of the EMU in this embodiment is shown in Figures 1-4 , and includes a housing 1, a triggering mechanism 2, a delay driving mechanism 3, a transmission mechanism 4, and a flipping fork 5 for resetting and closing the disconnected circuit breaker. The triggering mechanism 2 is connected to the delay driving mechanism 3, and the delay driving mechanism 3 is connected to the flipping fork 5. When the circuit breaker 6 is disconnected, the handle 61 of the circuit breaker 6 drops and contacts the triggering mechanism 2. The triggering mechanism 2 triggers the delay driving mechanism 3 to operate. The delay driving mechanism 3 drives the flipping fork 5 to move upward to reset and close the disconnected circuit breaker 6.

[0046] Further, the housing 1 is of a box structure and is composed of a front panel 11, a rear panel 12, a top panel 13, a bottom panel 14, a left panel 15, and a right panel 16.

[0047] Furthermore, the triggering mechanism 2 includes a triggering fork 21, a clamping member 22, and a torsion spring 23. The triggering fork 21 is mounted on a shaft 24 provided inside the housing 1. A torsion spring 23 is provided on the shaft 24. One end of the triggering fork 21 located inside the housing 1 is provided with a protrusion 25. The right end of the clamping member 22 is provided with a through hole 26 matching the protrusion 25. The protrusion 25 is inserted into the through hole 26. A clamping hole 221 for cooperating with the delay driving mechanism 3 is provided in the middle of the clamping member 22. The triggering fork 21 has a special-shaped structure. When the circuit breaker 6 is disconnected, the handle 61 of the circuit breaker 6 contacts the triggering mechanism 2. A triggering fork sliding groove 111 is provided on the front panel 11. The front part of the triggering fork 21 penetrates through the triggering fork sliding groove 111 and is exposed outside the front panel 11. The triggering fork 21 can slide up and down in the triggering fork sliding groove 111.

[0048] Furthermore, the delay driving mechanism 3 includes a delay cylinder 31, a piston 32, a piston rod 33, a first compression spring 34, and a throttle needle valve 35. The delay cylinder 31 is mounted on the bottom panel 14. A piston 32 is provided inside the delay cylinder 31. An O-ring 321 for maintaining airtightness is provided on the piston 32. A cylinder head 36 is provided on the delay cylinder 31. The clamping member 22 is located below the cylinder head 36. The lower end of the piston rod 33 sequentially penetrates through the top panel 13 of the housing 1, the cylinder head 36, and the clamping hole 221 in the middle of the clamping member 22 and is fixedly connected to the piston 32. A first compression spring 34 is sleeved on the piston rod 33 between the top panel 13 of the housing 1 and the cylinder head 36. A throttle needle valve 35 for adjusting the air intake and exhaust speed is provided at the bottom of the delay cylinder 31. A second compression spring 351 is provided on the throttle needle valve 35. The upper end of the piston rod 33 is exposed above the top panel 13 of the housing 1. A reset button 7 is installed at the upper end of the piston rod 33. A card slot 331 is provided on the piston rod 33. The clamping hole 221 is a special-shaped hole. The aperture L of the left part of the special-shaped hole is larger than the outer diameter D of the piston rod 33, allowing the piston rod 33 to freely slide in the left part of the special-shaped hole. The aperture M of the right part of the special-shaped hole is smaller than the outer diameter of the piston rod 33. The right part of the special-shaped hole matches the card slot 331, enabling the piston rod 33 to be stuck in the right part of the clamping hole 221.

[0049] Further, the transmission mechanism 4 includes a cross arm 41 and a suspension rod 42. One end of the cross arm 41 is provided with a mounting hole, and the piston rod 33 passes through the mounting hole at one end of the cross arm 41. The cross arm 41 is located above the first compression spring 34. The other end of the cross arm 41 is fixedly connected to one end of the suspension rod 42. The cross arm 41 and the suspension rod 42 are in a vertical structure. The other end of the suspension rod 42 is hinged to the flipping fork 5. A partition 114 is arranged between the suspension rod 42 and the torsion spring 23, and the torsion spring 23 is in contact with the partition 114. The transmission mechanism 4 further includes a snap ring 43. One end of the cross arm 41 with the mounting hole is provided with a hole for facilitating the installation of the snap ring 43. A groove 332 matching the snap ring 43 is also arranged on the piston rod 33. The cross arm 41 is fixed to the position of the piston rod 33 by the snap ring 43 being stuck in the groove 332.

[0050] Further, the flipping fork 5 is of an L-shaped structure and includes a vertical portion 51 and a horizontal portion 52. The vertical portion 51 and the horizontal portion 52 are of an integrally formed structure. The hinged position of the other end of the suspension rod 42 and the flipping fork 5 is the connection part of the vertical portion 51 and the horizontal portion 52. First guiding columns 511 are symmetrically arranged at the upper end of the vertical portion 51, and second guiding columns 512 are symmetrically arranged at the lower end of the vertical portion 51. Y-shaped sliding grooves 112 are arranged on both the front panel 11 and the partition 114. The first guiding columns 511 and the second guiding columns 512 can slide in the Y-shaped sliding grooves 112. The right side panel 16 is provided with a flipping fork sliding groove 113 for the horizontal portion 52 of the flipping fork 5 to slide. The length range of the flipping fork sliding groove 113 is that the lower end of the flipping fork sliding groove 113 is lower than the lower end of the handle 61 after the circuit breaker 6 is disconnected, and the upper end of the flipping fork sliding groove 113 is higher than the lower end of the handle 61 after the circuit breaker 6 is reset. The horizontal portion 52 of the flipping fork 5 can slide up and down in the flipping fork sliding groove 113. During the upward sliding process of the horizontal portion 52 of the flipping fork 5 in the flipping fork sliding groove 113, it can contact the handle 61 of the circuit breaker 6 and push the handle 61 upward.

[0051] Further, two buckles 121 are symmetrically arranged on the rear panel 12. The buckles 121 are connected to the rear panel 12 by screws. The buckles 121 can be stuck on the rail 8 for installing the circuit breaker 6. The buckles 121 are composed of a fixing plate 122, a movable plate 123 and a third compression spring 124. A connecting column 125 is arranged on the fixing plate 122. A movable groove 126 is arranged on the movable plate 123. The third compression spring 124 is arranged in the movable groove 126. The connecting column 125 is inserted between the inner wall of the movable groove 126 and one end face of the third compression spring 124.

[0052] Introduction of some components in the present invention:

[0053] The housing 1 is the main support and connection structure of the device.

[0054] The O-ring 321 ensures the airtightness between the inner wall of the time-delay cylinder 31 and the piston 32. The time-delay cylinder 31 is a relatively enclosed space formed at the bottom of the outer shell 1. The throttle needle valve 35 provided at the bottom of the time-delay cylinder 31 is used to adjust the air intake and exhaust speed of the time-delay cylinder 31 to achieve a time-delay effect. A compression spring 351 is installed on the throttle needle valve 35 to stabilize the stability of the throttle air flow and ensure the stability of the time-delay effect. In the untriggered state, the first compression spring 34 is in a compressed state. After triggering, finally, after the handle 61 of the circuit breaker 6 is closed, the state of the first compression spring 34 is an uncompressed state (i.e., the normal state).

[0055] The clamping part 22 is installed below the cylinder head 36. In the normal state (untriggered), the right end of the special-shaped card hole 221 on the clamping part 22 clamps the piston rod 33. The trigger fork 21 is installed on the shaft 24 of the outer shell 1 and is connected to the clamping part 22. A torsion spring 23 is installed on the shaft 24 of the outer shell 1. The function of the torsion spring 23 is that when the device is not triggered, the part of the trigger fork 21 exposed outside the outer shell 1 remains in an upward state, so that when the handle 61 of the circuit breaker 6 drops, it can contact the trigger fork 21. The trigger fork 21 provides the power to pull the clamping part 22 to the right.

[0056] The shape of the Y-shaped chute 112 described in the present invention is as Figure 1 shown. The Y-shaped chute 112 is composed of an arc-shaped chute 112-1 and a straight chute 112-2. The distance H1 between the first guide post 511 and the second guide post 512 is equal to the distance H2 from the fork opening A of the straight chute to the top B of the straight chute. The dimensions of the various components described in the present invention can be used in the technical solution of the present invention as long as they can achieve the functions described in the present invention.

[0057] The installation of the automatic reset device for the AC load circuit breaker of the EMU described in the present invention:

[0058] Press the buckle 121 on the rear panel 12 of the automatic reset device onto the guide rail, and press the right side of the automatic reset device tightly against the circuit breaker 6.

[0059] The working process of the automatic reset device for the AC load circuit breaker of the EMU described in the present invention is shown in Figure 5 the schematic diagram shown:

[0060] When the circuit breaker 6 is accidentally disconnected, the handle 61 on the circuit breaker 6 falls down, pressing the trigger fork 21 down, and the automatic reset device of the present invention is activated. After the trigger fork 21 is pressed downward, it drives the card member 22 to move rightward and escape from the card slot 331 of the piston rod 33. At this time, the piston rod 33 is located at the left part of the card hole 221 on the card member 22. Under the action of the elastic force of the first compression spring 34 (the elastic force generated by the recovery deformation), the piston 32 moves upward, and a negative pressure is formed at the lower part of the piston 32. The external air enters the delay cylinder 31 steadily and slowly through the throttle needle valve 35. The piston 32 moves upward slowly and steadily, driving the cross arm 41 and the suspension rod 42 to move upward. The suspension rod 42 drives the flip fork 5 to move upward. The horizontal part 52 of the flip fork 5 slides upward in the flip fork slide groove 113, and when it contacts the handle 61 of the circuit breaker 6, the handle 61 of the circuit breaker 6 is pushed upward until the handle 61 of the circuit breaker 6 is closed. In this process, the first guide column 51 of the vertical part 51 1 and the second guide column 512 are always sliding in the straight slide 112-2 of the Y-shaped slide 112. When the handle 61 of the circuit breaker 6 is closed, the piston 32 continues to move upward, so that the first guide column 511 and the second guide column 512 of the vertical portion 51 also continue to move upward. The first guide column 511 is located at the top B of the straight slide 112-2, and the second guide column 512 is located at the fork A of the straight slide 112-2. At this time, the horizontal portion 52 cannot move upward because of the obstruction of the handle 61 after the circuit breaker 6 is reset (i.e. closed), but flips downward. The second guide column 512 slides from the fork A of the straight slide 112-2 to the arcuate slide 112-1 of the Y-shaped slide 112, so that the horizontal portion 52 of the flip fork 5 is partially stored in the housing 1 to avoid hindering the disconnection action of the circuit breaker 6 (i.e. the handle 61 falls again).

[0061] The automatic reset device for the EMU AC load circuit breaker of the present invention will become invalid after performing the circuit breaker 6 reset action only once. The reset button 7 needs to be pressed down for the next use, and the flip fork 5 and the operating trigger mechanism 2 need to be turned back to the auxiliary position by tools to reset the device to the initial state.

[0062] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and the specific implementation of the present invention cannot be limited to these descriptions. For ordinary technicians in the field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An automatic reset device for an AC load circuit breaker of a multiple unit train, characterized in that: It includes a housing (1), a triggering mechanism (2), a time-delay driving mechanism (3), a transmission mechanism (4), and a flipping fork (5) for resetting and closing a disconnected circuit breaker. The triggering mechanism (2) is connected to the time-delay driving mechanism (3), and the time-delay driving mechanism (3) is connected to the flipping fork (5). When the circuit breaker (6) is disconnected, the handle (61) of the circuit breaker (6) drops and contacts the triggering mechanism (2), and the triggering mechanism (2) triggers the time-delay driving mechanism (3) to operate. The time-delay driving mechanism (3) drives the flipping fork (5) to move upward to reset and close the disconnected circuit breaker (6). The housing (1) is in a box structure and is composed of a front panel (11), a rear panel (12), a top panel (13), a bottom panel (14), a left side panel (15), and a right side panel (16). The triggering mechanism (2) includes a triggering fork (21), a clamping member (22), and a torsion spring (23). The triggering fork (21) is installed on a shaft (24) arranged inside the housing (1). A torsion spring (23) is arranged on the shaft (24). One end of the triggering fork (21) located inside the housing (1) is provided with a protrusion (25). The right end of the clamping member (22) is provided with a through hole (26) matching the protrusion (25), and the protrusion (25) is inserted into the through hole (26). A clamping hole (221) for cooperating with the time-delay driving mechanism (3) is arranged in the middle of the clamping member (22). The triggering fork (21) is of a special-shaped structure. When the circuit breaker (6) is disconnected, the handle (61) of the circuit breaker (6) contacts the triggering mechanism (2). A triggering fork sliding groove (111) is arranged on the front panel (11). The front part of the triggering fork (21) penetrates through the triggering fork sliding groove (111) and is exposed outside the front panel (11), and the triggering fork (21) can slide up and down in the triggering fork sliding groove (111). The time-delay driving mechanism (3) includes a time-delay cylinder (31), a piston (32), a piston rod (33), a first compression spring (34), and a throttle needle valve (35). The time-delay cylinder (31) is installed on the bottom panel (14). A piston (32) is arranged inside the time-delay cylinder (31). An O-ring (321) for maintaining airtightness is arranged on the piston (32). A cylinder head (36) is arranged on the time-delay cylinder (31). The clamping member (22) is located below the cylinder head (36). The lower end of the piston rod (33) sequentially penetrates through the top panel (13) of the housing (1), the cylinder head (36), and the clamping hole (221) in the middle of the clamping member (22) and is fixedly connected to the piston (32). A first compression spring (34) is sleeved on the piston rod (33) between the top panel (13) of the housing (1) and the cylinder head (36). A throttle needle valve (35) for adjusting the air intake and exhaust speed is arranged at the bottom of the time-delay cylinder (31). A second compression spring (351) is arranged on the throttle needle valve (35). The upper end of the piston rod (33) is exposed above the top panel (13) of the housing (1), and a reset button (7) is installed at the upper end of the piston rod (33).

2. The automatic reset device for the AC load circuit breaker of the multiple unit train according to claim 1, wherein: A clamping groove (331) is provided on the piston rod (33). The clamping hole (221) is a special-shaped hole. The aperture (L) of the left part of the special-shaped hole is larger than the outer diameter (D) of the piston rod (33), enabling the piston rod (33) to freely slide in the left part of the special-shaped hole. The aperture (M) of the right part of the special-shaped hole is smaller than the outer diameter of the piston rod (33), and the right part of the special-shaped hole matches the clamping groove (331), so that the piston rod (33) can be clamped at the right part of the clamping hole (221).

3. The automatic reset device for the AC load circuit breaker of the multiple unit as claimed in claim 1, wherein: The transmission mechanism (4) includes a cross arm (41) and a suspension rod (42). One end of the cross arm (41) is provided with a mounting hole. The piston rod (33) passes through the mounting hole at one end of the cross arm (41). The cross arm (41) is located above the first compression spring (34). The other end of the cross arm (41) is fixedly connected to one end of the suspension rod (42). The cross arm (41) and the suspension rod (42) are in a vertical structure. The other end of the suspension rod (42) is hinged to the flipping fork (5). A partition plate (114) is provided between the suspension rod (42) and the torsion spring (23), and the torsion spring (23) is in contact with the partition plate (114).

4. The automatic reset device for the AC load circuit breaker of the multiple unit train according to claim 3, wherein: The transmission mechanism (4) further includes a snap ring (43). One end of the cross arm (41) with the mounting hole is provided with a hole for facilitating the installation of the snap ring (43). A groove (332) matching the snap ring (43) is also provided on the piston rod (33). The cross arm (41) is clamped in the groove (332) through the snap ring (43) to fix the position of the cross arm (41) and the piston rod (33).

5. The automatic reset device for the AC load circuit breaker of the multiple unit train according to claim 4, characterized in that: The flipping fork (5) is of an L-shaped structure, including a vertical part (51) and a horizontal part (52). The vertical part (51) and the horizontal part (52) are of an integrally formed structure. The hinged position of the other end of the suspension rod (42) and the flipping fork (5) is the connection part of the vertical part (51) and the horizontal part (52). First guiding columns (511) are symmetrically arranged at the upper end of the vertical part (51), and second guiding columns (512) are symmetrically arranged at the lower end of the vertical part (51). Y-shaped sliding grooves (112) are provided on both the front panel (11) and the partition plate (114). The first guiding columns (511) and the second guiding columns (512) can slide in the Y-shaped sliding grooves (112). The right side panel (16) is provided with a flipping fork sliding groove (113) for the horizontal part (52) of the flipping fork (5) to slide. The length range of the flipping fork sliding groove (113) is that the lower end of the flipping fork sliding groove (113) is lower than the lower end of the handle (61) after the circuit breaker (6) is disconnected, and the upper end of the flipping fork sliding groove (113) is higher than the lower end of the handle (61) after the circuit breaker (6) is reset. The horizontal part (52) of the flipping fork (5) can slide up and down in the flipping fork sliding groove (113). During the upward sliding process of the horizontal part (52) of the flipping fork (5) in the flipping fork sliding groove (113), it can contact the handle (61) of the circuit breaker (6) and push the handle (61) upward.

6. The automatic reset device for the AC load circuit breaker of the multiple unit train according to claim 1, characterized in that: There are two symmetrically arranged buckles (121) on the rear panel (12). The buckle (121) is connected to the rear panel (12) by screws. The buckle (121) can be stuck on the rail (8) for installing the circuit breaker (6). The buckle (121) is composed of a fixed plate (122), a movable plate (123) and a third compression spring (124). A connecting column (125) is arranged on the fixed plate (122). An activity slot (126) is arranged on the movable plate (123). A third compression spring (124) is arranged in the activity slot (126). The connecting column (125) is inserted between the inner wall of the activity slot (126) and one end face of the third compression spring (124).

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