A direct current trolley interlocking mechanism and a direct current switch cabinet

Abstract

The application discloses a DC trolley interlocking mechanism and a DC switch cabinet, which comprises a trolley frame, a circuit breaker mounting plate slidingly installed on the trolley frame, a cross beam installed on the outer end of the trolley frame, a handle operating hole arranged on the cross beam, a lead screw transmission system installed on the trolley frame and corresponding to the handle operating hole, and the lead screw transmission system being connected with the circuit breaker mounting plate; a lock rod is slidingly installed on the cross beam, a lock groove is arranged on the lock rod, a movable plate is rotatably installed on the cross beam, a stop pin is arranged at one end of the movable plate and corresponding to the lock groove, a control end is arranged at the other end of the movable plate, and a control pin is arranged on the circuit breaker mounting plate and corresponding to the control end; in a working state, the lock rod extends out of the cross beam and interferes with a DC cabinet body, the stop pin is clamped into the lock groove, and the DC trolley is locked in the DC cabinet body; in an isolation state, the stop pin is separated from the lock groove, the lock rod is retracted into the cross beam and separated from the DC cabinet body, and the DC trolley is unlocked.

Description

Technical Field

[0001] This invention relates to DC switchgear, specifically to a DC trolley interlocking mechanism and a DC switchgear. Background Technology

[0002] Currently, subways and trams in China's urban rail transit systems all use DC power supply. DC traction power supply systems typically consist of DC switchgear products such as incoming line cabinets and feeder cabinets. These DC switchgear utilize high-performance, fast circuit breakers to provide safe and reliable DC power for urban rail transit, industrial and mining facilities, airports, and ports.

[0003] DC switchgear mainly consists of components such as a DC trolley (referred to as the trolley) and a DC cabinet. High-performance fast circuit breakers are installed on the DC trolley, which is located inside the DC cabinet. A reliable and stable mechanical interlock is required between the DC trolley and the DC cabinet to ensure the safety and stability of the DC power supply system and prevent electrical accidents. Specifically: after the DC trolley is pushed into the DC cabinet, the locking rods on both sides of the crossbeam on the DC trolley are extended out of the crossbeam using the operating handle, interfering with the DC cabinet to lock the trolley and position it. At this point, the trolley cannot be pulled out of the DC cabinet. When the locking rods retract into the crossbeam, the trolley unlocks and can be pulled out of the DC cabinet. A stable interlock function is required between the trolley and the DC cabinet. The trolley has two states: isolation and operation. In the operation state, the trolley must be interlocked to ensure that it cannot be pulled out of the DC cabinet; only in the isolation state can the trolley be pulled out of the DC cabinet.

[0004] However, the locking rods on both sides of the trolley crossbeam of the existing DC switchgear are machined flat iron blocks, which require high precision in material processing, welding, and installation, resulting in high costs. Furthermore, the locking rods may jam if they do not slide smoothly enough, affecting the safety of the trolley. Secondly, if the interlock between the trolley and the DC cabinet door fails, the trolley can be pulled directly out of the DC cabinet while in operation. There is no separate interlock to ensure that the trolley can only be unlocked and pulled out of the DC cabinet when in an isolated state. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the shortcomings of the unstable performance of the trolley interlocking mechanism in existing DC switchgear. The present invention provides a DC trolley interlocking mechanism and DC switchgear with more stable interlocking mechanism performance.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A DC trolley interlocking mechanism includes a frame, a circuit breaker mounting plate slidably mounted on the frame, and a crossbeam mounted on the outer end of the frame. Its structural features are as follows:

[0008] The crossbeam is provided with a handle operation hole, and a screw drive system is installed on the frame corresponding to the handle operation hole. One end of the screw drive system is used to connect to the operation handle that extends into the handle operation hole, and the other end is connected to the circuit breaker mounting plate.

[0009] A locking rod is slidably installed on the crossbeam, and a locking groove is provided on the locking rod. A movable plate is rotatably installed on the crossbeam, and a stop pin is provided at one end of the movable plate and a control terminal is provided at the other end. A control pin is provided on the circuit breaker mounting plate, and the stop pin is provided in correspondence with the locking groove, and the control pin is provided in correspondence with the control terminal.

[0010] In the working state, the circuit breaker mounting plate and the control pin are away from the crossbeam and the movable plate, the locking rod extends out of the crossbeam and interferes with the DC cabinet, and the stop pin is inserted into the locking groove, so that the DC trolley is locked in the DC cabinet.

[0011] In the isolated state, the circuit breaker mounting plate and the control pin are close to the crossbeam, and the control pin pushes against the control end of the movable plate, causing the stop pin to disengage from the lock groove, the lock rod to retract into the crossbeam and disengage from the DC cabinet, and the DC trolley to unlock.

[0012] Preferably, a slot is provided on the crossbeam, the slot having a horizontal section and a vertical section, and a handle is slidably installed in the slot. The handle is connected to the locking rod. When the handle is in the horizontal section, the handle can drive the locking rod to extend or retract into the crossbeam. When the handle is in the vertical section, the handle locks the position of the locking rod.

[0013] Preferably, the end of the locking rod is connected to a baffle. In the working state, the baffle is offset from the handle operation hole, and in the isolated state, the baffle blocks the handle operation hole.

[0014] Preferably, a guide mechanism is provided between the crossbeam and the baffle to ensure that the baffle can slide smoothly with the locking rod, and to ensure that the handle operation hole is open when the trolley is in working state, so as to facilitate the insertion of the operating handle. When in the isolated state, the handle operation hole is blocked by the baffle.

[0015] Preferably, a tension spring is installed between the stop pin and the crossbeam to ensure that the stop pin is stably engaged in the locking groove, thereby ensuring the stability of the DC trolley's working state.

[0016] Preferably, a first locking rod seat and a second locking rod seat are installed on the crossbeam, the locking rod is slidably installed on the first locking rod seat and the second locking rod seat, and a reset post is provided on the locking rod, and a reset spring is installed between the reset post and the first locking rod seat and / or the second locking rod seat.

[0017] Preferably, the circuit breaker mounting plate is located at the top of the frame, and the crossbeam is arranged corresponding to the circuit breaker mounting plate to increase the operating point height of the interlocking mechanism of the present invention, avoid squatting or bending over to operate, and make it easier to unlock the DC trolley and perform emergency tripping.

[0018] Preferably, the locking rods are installed at both ends of the crossbeam to enable a more stable interlock between the DC trolley and the DC cabinet.

[0019] Based on the same inventive concept, the present invention also provides a DC switch cabinet, which includes a DC trolley and a DC cabinet, wherein the DC trolley is located inside the DC cabinet, and the DC trolley interlocking mechanism is provided between the DC trolley and the DC cabinet.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. Compared with the existing structure, the present invention replaces the original flat iron block with a cylindrical locking rod, which makes the requirements for the processing accuracy, welding accuracy and installation accuracy of the trolley crossbeam components lower, the interlocking cost lower, and the structure simpler and safer. It can ensure that after the interlock between the DC trolley and the DC cabinet door fails, the DC trolley cannot be unlocked and pulled out of the DC cabinet in the working state. The DC trolley can only be unlocked from the DC cabinet and pulled out of the DC cabinet after the circuit breaker mounting plate reaches the isolation position.

[0022] 2. The present invention installs the circuit breaker mounting plate on the top of the frame, which can increase the position of the crossbeam of the DC trolley interlocking mechanism accordingly, making the locking and unlocking operation points higher, eliminating the need to squat or bend over to operate, and making it easier to rotate the screw and perform emergency tripping.

[0023] 3. The handle of this invention has a slot comprising a horizontal section and a vertical section. The position of the vertical section corresponds to the position of the locking rod when it is unlocked. This allows the handle to rotate into the vertical section when the locking rod is retracted by pulling the handle to unlock the DC trolley, thus locking the locking rod in the unlocked position. At this time, pulling the handle outward can also pull the DC trolley out of the DC cabinet. In this way, the handle not only unlocks the DC trolley but also locks the unlocked state of the DC trolley before pulling it out of the DC cabinet, ensuring safe operation. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1This is a three-dimensional structural diagram (in working state) of the DC vehicle of the present invention.

[0026] Figure 2 A three-dimensional structural diagram (in working state) of a DC trolley with the crossbeam and control pins removed.

[0027] Figure 3 This is a top view of the DC vehicle of the present invention (in working condition).

[0028] Figure 4 A rear view schematic diagram of the crossbeam assembly.

[0029] Figure 5 A simplified structural diagram (working state) of the DC trolley interlocking mechanism of the present invention.

[0030] Figure 6 This is a three-dimensional structural schematic diagram (isolated state) of the DC vehicle of the present invention.

[0031] Figure 7 A three-dimensional structural diagram of the DC trolley with the crossbeam and control pin removed (in isolated state).

[0032] Figure 8 This is a top view of the DC vehicle of the present invention (in isolated state).

[0033] Figure 9 A simplified structural diagram of the DC trolley interlocking mechanism of the present invention (isolation state).

[0034] In the diagram: 1. Baffle; 2. Return spring; 3. Movable plate; 4. First axle pin; 5. Crossbeam bent plate; 6. Stop pin; 7. Control pin; 8. Tension spring; 9. First locking rod seat; 10. Locking rod; 11. Handle; 12. Second locking rod seat; 13. Screw joint; 14. Circuit breaker mounting plate; 15. Crossbeam; 16. Second axle pin; 17. Frame; 18. Screw drive system; 19. Handle operating hole; 20. Lock groove; 21. Return column; 22. Slot; 221. Horizontal section; 222. Vertical section; 23. Control end. Detailed Implementation

[0035] The present invention will be further described below with reference to specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0036] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] Please see Figures 1-5 An embodiment of the DC trolley interlocking mechanism of the present invention includes a frame 17, on which a circuit breaker mounting plate 14 is slidably mounted, and a crossbeam 15 is mounted on the outer end of the frame 17.

[0039] A handle operation hole 19 is provided in the middle of the crossbeam 15, and a screw drive system 18 is installed on the frame 17 corresponding to the handle operation hole 19. One end of the screw drive system 18 is provided with a screw connector 13, which is used to connect to an operating handle (not shown in the figure) that extends into the handle operation hole 19 to drive the screw drive system 18. The other end is connected to the circuit breaker mounting plate 14. Thus, when the screw drive system 18 is driven by the operating handle, the screw drive system 18 will drive the circuit breaker mounting plate 14 away from or towards the crossbeam 15. The screw drive system 18 mentioned in this document is an existing structure, so it will not be described in detail here. Its main function is to drive the circuit breaker mounting plate 14 away from or towards the crossbeam 15.

[0040] The circuit breaker mounting plate 14 is located on the top of the frame 17, and the crossbeam 15 is set corresponding to the circuit breaker mounting plate 14 to increase the operating point height of the interlocking mechanism of the present invention, avoid squatting or bending over to operate, and make it easier to unlock the DC trolley and perform emergency tripping.

[0041] The first locking rod seat 9 and the second locking rod seat 12 are respectively installed opposite each other on the back end of the crossbeam 15. Locking rods 10 are slidably installed on the first locking rod seat 9 and the second locking rod seat 12, and locking grooves 20 are provided on the locking rods 10. A crossbeam bending plate 5 is installed on the back end of the crossbeam 15. A movable plate 3 is rotatably installed on the crossbeam bending plate 5 via a first shaft pin 4. A stop pin 6 is provided at one end of the movable plate 3 corresponding to the locking groove 20, and a control end 23 is provided at the other end. A control pin 7 is provided on the circuit breaker mounting plate 14 corresponding to the control end 23. When the control pin 7 approaches the crossbeam 15 along with the circuit breaker mounting plate 14, the control pin 7 pushes against the control end 23 of the movable plate 3, causing the movable plate 3 to rotate, and the stop pin 6 disengages from the locking groove 20.

[0042] To facilitate the reset of the stop pin 6, a tension spring 8 is installed between the stop pin 6 and the crossbeam 15, with one end of the tension spring 8 connected to the crossbeam 15 and the other end connected to the stop pin 6. When the control pin 7 moves away from the crossbeam 15 along with the circuit breaker mounting plate 14, the movable plate 3 rotates under the tension of the tension spring 8, and the stop pin 6 enters the locking groove 20, locking the state of the locking rod 10.

[0043] A slot 22 is provided on the crossbeam 15. The slot 22 has a horizontal section 221 and a vertical section 222, which are connected to form an L-shaped slot. A handle 11 is slidably installed in the slot 22, and the handle 11 is connected to the locking rod 10. When the handle 11 is located in the horizontal section 221, the handle 11 can drive the locking rod 10 to extend or retract into the crossbeam 15. When the handle 11 is located in the vertical section 222, the handle 11 locks the position of the locking rod 10, and the locking rod 10 cannot extend out of the crossbeam 15.

[0044] To prevent accidental operation in the isolated state, a baffle 1 is connected to the end of the locking rod 10. In the working state, the baffle 1 moves outward as the locking rod 10 extends, causing the baffle 1 to be misaligned with the handle operation hole 19. The operating handle can then connect to the lead screw joint 13 of the lead screw transmission system 18 through the handle operation hole 19 and drive the lead screw transmission system 18. In the isolated state, the baffle 1 moves inward as the locking rod 10 retracts, blocking the handle operation hole 19 and preventing accidental operation of the lead screw transmission system 18.

[0045] To ensure the smooth movement of the baffle 1, a guide mechanism is provided between the crossbeam 15 and the baffle 1.

[0046] To facilitate the reset of the locking rod 10, a reset post 21 is provided on the locking rod 10, and a reset spring 2 is installed between the reset post 21 and the first locking rod seat 9 and / or the second locking rod seat 12. When the stop pin 6 exits the locking groove 20, the locking rod 10 can retract into the crossbeam 15 under the combined action of the handle 11 and the reset spring 2.

[0047] Obviously, the present invention also provides a DC switch cabinet, which includes a DC trolley and a DC cabinet, wherein the DC trolley is matched with the DC cabinet and can be pushed into or pulled out of the DC cabinet, and the DC trolley interlocking mechanism of the present invention is provided between the DC trolley and the DC cabinet.

[0048] When used, the DC trolley of this invention has a working state and an isolated state, such as... Figure 1 - Figure 5 As shown, in the working state, the DC trolley is locked inside the DC cabinet by the interlocking mechanism and cannot be pulled out of the DC cabinet. At this time, the handle 11 is located in the horizontal section 221 of the slot 22, the locking rod 10 extends out of both ends of the crossbeam 15 and into the DC cabinet, interfering with the DC cabinet. The circuit breaker mounting plate 14 is in a position away from the DC trolley, and the control pin 7 is also disengaged from the control end 23 of the movable plate 3. The stop pin 6 on the movable plate 3 is located in the locking groove 20 under the action of the tension spring 8, locking the position of the locking rod 10 and ensuring the stability of the DC trolley's working state. The baffle 1 moves to the outermost position with the locking rod 10, exposing the handle operation hole 19 on the crossbeam 15. The operating handle can be inserted into the handle operation hole 19 on the crossbeam 15 and connected to the screw joint 13 of the screw drive system 18 to drive the screw drive system 18 and the circuit breaker mounting plate 14. In this state, since the stop pin 6 of the movable plate 3 is engaged in the locking groove 20 of the locking rod 10, the locking rod 10 cannot be moved when the handle 11 is turned.

[0049] When the DC trolley is in the working state, the operating handle is inserted into the handle operating hole 19 on the crossbeam 15 and connected to the screw connector 13 of the screw drive system 18. By rotating the operating handle, the screw drive system 18 can be driven to rotate, causing the circuit breaker mounting plate 14 to move linearly towards the crossbeam 15. When the circuit breaker mounting plate 14 moves to the leftmost position (closest to the crossbeam 15), as... Figure 6 - Figure 9 As shown, the control pin 7 moves with the circuit breaker mounting plate 14, pushing against the control end 23 of the movable plate 3. The movable plate 3 rotates, and the stop pin 6 swings accordingly and disengages from the locking groove 20 of the locking rod 10. At this time, pulling the handle 11 can drive the locking rod 10 and the baffle 1 to move left and right. Bring the handles 11 at both ends of the crossbeam 15 together (along the horizontal section 221 of the slot 22), causing the locking rod 10 to retract into the crossbeam 15 and disengage from the DC cabinet. Then, rotate the handle 11 downwards to engage with the lower end of the vertical section 222 of the slot 22 on the crossbeam 15, and the DC trolley enters the isolation state. At this time, pulling the handle 11 forcefully can pull the DC trolley out of the DC cabinet.

[0050] When the DC carriage is not in position or the locking rod 10 is not fully inserted into the DC cabinet, the baffle 1 will block the handle operation hole 19 on the crossbeam 15, preventing the operating handle from being inserted into the crossbeam 15 and driving the screw transmission system 18, thus isolating the DC carriage.

[0051] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A DC trolley interlocking mechanism, comprising a trolley frame, a circuit breaker mounting plate slidingly mounted on the trolley frame, and a cross beam mounted on the outer end of the trolley frame, characterized in that: a handle operating hole is provided on the cross beam, a screw rod transmission system is mounted on the trolley frame corresponding to the handle operating hole, one end of the screw rod transmission system is connected with an operating handle extending into the handle operating hole, and the other end is connected with the circuit breaker mounting plate; a lock rod is slidingly mounted on the cross beam, a lock groove is provided on the lock rod, a movable plate is rotatably mounted on the cross beam, one end of the movable plate is provided with a stop pin, and the other end is provided with a control end, a control pin is provided on the circuit breaker mounting plate, the stop pin and the control pin are correspondingly provided with the lock groove and the control end; a clamping groove is provided on the cross beam, the clamping groove has a horizontal section and a vertical section, and a handle is slidingly mounted in the clamping groove, the handle is connected with the lock rod, when the handle is located in the horizontal section, the handle can drive the lock rod to extend out of or retract into the cross beam, and when the handle is located in the vertical section, the handle locks the position of the lock rod; in a working state, the circuit breaker mounting plate and the control pin are away from the cross beam and the movable plate, the handle drives the lock rod to extend out of the cross beam and interfere with a DC cabinet body, the stop pin is clamped into the lock groove, and the DC trolley is locked in the DC cabinet body; in an isolation state, the circuit breaker mounting plate and the control pin are close to the cross beam, the control pin pushes against the control end of the movable plate, the stop pin is disengaged from the lock groove, the handle drives the lock rod to retract into the cross beam and disengage from the DC cabinet body, and the DC trolley is unlocked. An end portion of the lock rod is connected with a baffle, in the working state, the baffle is staggered with the handle operating hole, and in the isolation state, the baffle blocks the handle operating hole. A guide mechanism is provided between the cross beam and the baffle. A tension spring is mounted between the stop pin and the cross beam. A first lock rod seat and a second lock rod seat are mounted on the cross beam, the lock rod is slidingly mounted on the first lock rod seat and the second lock rod seat, a reset column is provided on the lock rod, and a reset spring is mounted between the reset column and the first lock rod seat and / or the second lock rod seat. The circuit breaker mounting plate is located on the top of the trolley frame, and the cross beam is provided corresponding to the circuit breaker mounting plate.

2. The trolley interlock mechanism of claim 1, wherein The lock rod is mounted on both ends of the cross beam.

3. The trolley interlock mechanism of claim 2, wherein, 8. A DC switch cabinet, comprising a DC trolley and a DC cabinet body, the DC trolley being located in the DC cabinet body, and the DC trolley and the DC cabinet body being provided with the DC trolley interlocking mechanism according to any one of claims 1-7.

4. The trolley interlock mechanism of claim 1, wherein, ​ 5. The trolley interlock mechanism of claim 1, wherein, ​ 6. The trolley interlock mechanism of claim 1, wherein ​ 7. The trolley interlock mechanism of claim 1, wherein ​ ​

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