A switch cabinet interlocking mechanism

Abstract

The present invention relates to the technical field of safety interlocking of high-voltage switchgear. The present invention discloses a switchgear interlocking mechanism, comprising a main cabinet, a trolley chamber, and a cable chamber. A trolley lock valve is provided at the bottom of the trolley chamber, and a grounding lock valve is hingedly connected to a grounding switch bracket. The trolley lock valve and the grounding lock valve are provided. A first piston rod that is axially movable is provided in the trolley lock valve, and a second piston rod that is axially movable is provided in the grounding lock valve. A piston that is movable in a deflector sleeve is provided between the first piston rod and the second piston rod. The advantages of the present invention over the prior art are: a hydraulic interlocking topology mechanism cooperates with mechanical / electrical functions to improve safety redundancy, and can provide two-way interlocking to prevent the trolley from being operated under load and to prevent the grounding knife from being closed under power, thereby improving safety. Most components operate in an oil-immersed environment, are resistant to rust and friction, and linkage can be achieved by connecting hydraulic pipelines. It can be simply installed in most switchgears and has wide adaptability.

Description

Technical Field

[0001] The present invention relates to the technical field of safety interlocking of high-voltage switchgear, and in particular to an interlocking mechanism of a switch cabinet. Background Art

[0002] The interlocking mechanism of a switchgear is a key design element for ensuring the safe operation of power systems. Its core purpose is to prevent misoperation, avoiding equipment damage, casualties, or grid accidents caused by incorrect or illegal operating sequences. Typically, switchgear should implement the "five protections" feature.

[0003] The “Five Preventions” include:

[0004] Prevent accidental opening and closing of circuit breakers.

[0005] The circuit breaker must be operated with a special key or authorization verification and locked in the non-operating state.

[0006] Prevent disconnecting and closing of isolating switches under load.

[0007] When the circuit breaker is not disconnected, the mechanical interlock forced disconnector and trolley cannot be operated.

[0008] Prevent closing the grounding switch while energized.

[0009] When the busbar or line is energized, the grounding switch operating hole is physically locked.

[0010] Prevent closing the circuit breaker with ground wire.

[0011] When the grounding switch is not disconnected, the circuit breaker and disconnector are locked.

[0012] Prevent accidental entry into live compartments.

[0013] The cabinet door is linked to the grounding switch: the cabinet door can only be opened after grounding, otherwise it will be locked.

[0014] Generally speaking, in order to ensure that the above safety devices have sufficient safety redundancy, the switch cabinet will include a set of mechanical interlocking devices and electrical interlocking devices to simultaneously realize the above functions.

[0015] However, with the continuous use of the equipment, the above-mentioned mechanical interlocking device is prone to mechanical jamming (rust, deformation), or the interlocking structure is damaged due to violent operation. The electrical interlocking device will also cause signal failure due to oxidation of the electrical contacts. Among the "five protections", especially for preventing the closing of the grounding switch with power on and preventing the closing of the circuit breaker with power on with the grounding wire, due to the long distance between the grounding switch and the circuit breaker, there are more devices that need to participate in the interlocking in the mechanical interlocking, and there are more vulnerable points that are more likely to fail due to rust, deformation or damage. Summary of the Invention

[0016] The technical problem to be solved by the present invention is that the existing mechanical interlock and electrical interlock are easily damaged, resulting in insufficient safety redundancy, and a switch cabinet interlock mechanism is provided.

[0017] In order to solve the above technical problems, the technical solution provided by the present invention is: a switch cabinet interlocking mechanism, including a main cabinet body, a trolley room and a cable room, the trolley room and the cable room are respectively located on both sides of the main cabinet body, a slide rail is provided on the side of the trolley room, a guard plate is provided above the slide rail, a trolley chassis is slidably provided on the slide rail, a circuit breaker is provided on the trolley chassis, a grounding switch bracket is provided in the cable room, and a three-phase grounding knife is provided on the grounding switch bracket for rotation connection.

[0018] A trolley lock valve is provided at the bottom of the trolley chamber, and a grounding lock valve is hingedly connected to the grounding switch bracket. The trolley lock valve and the grounding lock valve are coaxially arranged on the top with an outer oil chamber and an inner oil chamber. A hydraulically controlled sliding floating valve ring is provided in the outer oil chamber, and a fixed deflection sleeve is provided in the inner oil chamber. A gap is left between the deflection sleeve and the inner oil chamber. A connecting groove is provided in the middle of the outer oil chamber and the inner oil chamber, and a deflection ring is provided in the middle of the deflection sleeve. The deflection ring extends between the connecting groove to separate and isolate the two sides thereof. A deflection groove is provided on the inner ring of the upper part of the floating valve ring to connect the two sides of the connecting groove.

[0019] An axially movable first piston rod is provided in the trolley lock valve, an axially movable second piston rod is provided in the grounding lock valve, a piston movable in the deflection sleeve is provided in the middle of the first piston rod and the second piston rod, and the top end of the first piston rod is hingedly connected to the bottom of the grounding knife.

[0020] A lever for controlling the opening and closing of the circuit breaker is provided at the bottom of the circuit breaker, an insulating pull rod movable in the vertical direction is provided above the end of the lever, a slider sliding toward the outside of the slide rail is provided in the trolley chassis, a cross bit is hingedly provided at the end of the lever, a first connecting rod is hingedly provided at the top of the cross bit, the end of the first connecting rod is hingedly connected to the bottom of the insulating pull rod, a second connecting rod is hingedly provided at the bottom of the cross bit, the end of the second connecting rod is hingedly connected to the top of the slider, the end of the lever moves upward to drive the insulating pull rod to move upward to close the circuit breaker, and at the same time, the slider is retracted into the trolley chassis, the end of the lever moves downward to drive the insulating pull rod to move downward to open the circuit breaker, and at the same time, the slider is extended out of the slide rail.

[0021] A pin block is provided at the outer end of the second piston rod, a first stop block is provided in the trolley chassis and can be pressed against the outer end face of the pin block, a second stop block is provided on the slider, and when the slider extends out of the slide rail, the side face of the second stop block is pressed against the end face of the pin block facing the trolley lock valve.

[0022] A flip plate is hingedly provided on the outer side of the slide rail, and the slider extends out of the slide rail to push the flip plate upward and flip it. A circuit breaker valve is provided on the protective plate above the flip plate, and a third piston rod movable in the vertical direction is provided in the circuit breaker valve. A third connecting rod is hingedly connected to the bottom of the third piston rod, and the end of the third connecting rod is hingedly connected to the flip plate.

[0023] The circuit breaker valve, trolley lock valve and grounding lock valve are all provided with a slidable valve core, and a guide groove is provided on the outside of the valve core. The circuit breaker valve, trolley lock valve and grounding lock valve are all provided with three hydraulic oil circuits. When the valve core slides to different positions, the guide groove selectively connects two of the oil ports and closes the other oil port, or changes the combination of the connected oil ports.

[0024] A cavity is provided inside the valve core in the ground lock valve, the end of the first piston rod extends into the cavity and is provided with a clamping ring that matches the cavity, and the clamping ring can move slightly in the cavity.

[0025] The valve core in the circuit breaker valve is fixedly connected to the third piston rod, and the valve core in the trolley lock valve is fixedly connected to the second piston rod.

[0026] The trolley chassis is provided with a trolley bracket, which can be locked with the outer end of the slide rail. A screw locker is provided in the trolley chamber. The trolley bracket is provided with a screw for driving the trolley chassis to move. The end of the screw extends into the screw locker, and multiple grooves are provided around the end of the screw.

[0027] A plurality of ball grooves pointing to the center are arranged around the screw locker, and balls are slidably arranged in the ball grooves. A sliding ring is slidably arranged at the end of the screw locker. The sliding ring is provided with a plurality of extension arms. The ends of the extension arms are arranged with inclined surfaces and extend into the ball grooves to press tightly against the balls. A hydraulic chamber is provided in the screw locker, and the sliding ring is provided with a plunger that cooperates with the hydraulic chamber.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] The hydraulic interlock topology mechanism realizes the three-in-one interlock of "trolley position-circuit breaker status-grounding switch" through dynamic switching of the oil circuit of the floating valve ring, deflector sleeve and connecting groove, and cooperates with the mechanical / electrical function to significantly improve safety redundancy.

[0030] Two-way interlocking can be provided to prevent the trolley from being operated with load and to prevent the grounding knife from being closed with power on, which significantly improves safety.

[0031] Most of the components involved in the hydraulic interlocking topology mechanism work in an oil-immersed environment and are resistant to rust and friction.

[0032] The linkage between the hydraulic interlocking topology mechanisms can be achieved through the connection of hydraulic pipelines. It can be easily installed in most existing switch cabinets and has a wide adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the external structure of the present invention.

[0034] Figure 2It is a structural schematic diagram of the trolley room and cable room of the present invention.

[0035] Figure 3 This invention is attached Figure 2 Schematic diagram of the enlarged structure at point a.

[0036] Figure 4 It is a structural schematic diagram of the circuit breaker of the present invention.

[0037] Figure 5 It is a structural schematic diagram of the handcart chassis of the present invention.

[0038] Figure 6 This invention is attached Figure 5 Schematic diagram of the enlarged structure at point b.

[0039] Figure 7 It is a structural schematic diagram of the lever of the present invention.

[0040] Figure 8 This invention is attached Figure 7 Schematic diagram of the enlarged structure at point c.

[0041] Figure 9 It is a structural schematic diagram of the slide rail of the present invention.

[0042] Figure 10 This invention is attached Figure 9 Schematic diagram of the enlarged structure at point d in the middle.

[0043] Figure 11 It is a structural schematic diagram of the handcart bracket of the present invention.

[0044] Figure 12 It is a structural schematic diagram of the trolley chassis when the circuit breaker of the present invention is closed.

[0045] Figure 13 It is a structural schematic diagram of the slider when the circuit breaker of the present invention is closed.

[0046] Figure 14 It is a structural schematic diagram of the flip plate of the present invention.

[0047] Figure 15 It is a structural schematic diagram of the flip plate when the circuit breaker of the present invention is closed.

[0048] Figure 16 It is a structural schematic diagram of the grounding switch bracket of the present invention.

[0049] Figure 17 It is a structural schematic diagram of the grounding knife of the present invention when it is closed.

[0050] Figure 18 It is a schematic diagram of the oil circuit interface structure of the grounding lock valve of the present invention.

[0051] Figure 19It is a structural schematic diagram of the deflector sleeve of the present invention.

[0052] Figure 20 It is a structural schematic diagram of the grounding lock valve when the grounding knife is closed.

[0053] Figure 21 It is a structural schematic diagram of the grounding lock valve of the present invention when it is locked by pressure relief.

[0054] Figure 22 It is a structural schematic diagram of the trolley lock valve of the present invention when it is pressure-released and locked.

[0055] Figure 23 It is a structural schematic diagram of the trolley lock valve of the present invention.

[0056] Figure 24 It is a structural schematic diagram of the screw locker of the present invention when it is depressurized and locked.

[0057] Figure 25 It is a structural schematic diagram of the screw locker of the present invention.

[0058] Figure 26 It is a schematic diagram of the position of the screw locker interface of the present invention.

[0059] Figure 27 It is a schematic diagram of the oil circuit structure of the screw locker of the present invention.

[0060] Figure 28 It is a structural schematic diagram of the circuit breaker valve of the present invention.

[0061] Figure 29 It is a schematic diagram of the overall oil circuit connection structure of the present invention.

[0062] As shown in the figure: 1. Main cabinet, 2. Cart compartment, 3. Cable compartment, 4. Guard plate, 5. Slide rail, 6. Grounding switch bracket, 7. Flip plate, 8. Circuit breaker valve, 9. Third piston rod, 10. Third connecting rod, 11. Cart bracket, 12. Circuit breaker, 13. Cart chassis, 14. Screw, 15. Screw lock, 16. Insulating pull rod, 17. Lever, 18. Cross nut, 19. First connecting rod, 20. Second connecting rod, 21. Slider, 22. Cart lock valve, 23. Second piston rod, 24. Pin block, 25. First stopper, 26. Second stopper, 27. Slider slot, 28. Grounding knife, 29. Grounding lock valve, 30. First piston rod, 31. First reversing valve interface, 32. First An oil tank interface, 33. A first oil pump interface, 34. A grounding lock pressure supply interface, 35. A floating valve ring, 36. A deflector sleeve, 37. A valve core, 38. An outer oil chamber, 39. An inner oil chamber, 40. A connecting groove, 41. A deflector ring, 42. A deflector groove, 43. A guide groove, 44. A cavity, 45. A piston, 46. A retaining ring, 47. A trolley lock pressure supply interface, 48. A second reversing valve interface, 49. A second oil pump interface, 50. A second oil tank interface, 51. A sliding ring, 52. A ball groove, 53. A ball, 54. An extension arm, 55. A groove, 56. A hydraulic chamber, 57. A plunger, 58. A screw lock interface, 59. A circuit breaker valve interface, 60. A third oil tank interface, 61. A third oil pump interface. DETAILED DESCRIPTION

[0063] The present invention will be described in further detail below with reference to the accompanying drawings.

[0064] Combined with attachment Figure 1 , Attachment Figure 2 , Attachment Figure 4 , Attachment Figure 5 , Attachment Figure 16 and attached Figure 17 A switch cabinet interlocking mechanism includes a main cabinet body 1, a trolley room 2 and a cable room 3. The trolley room 2 and the cable room 3 are respectively located on both sides of the main cabinet body 1. A slide rail 5 is provided on the side of the trolley room 2, and a guard plate 4 is provided above the slide rail 5. The slide rail 5 is slidingly provided with a trolley chassis 13, and a circuit breaker 12 is provided on the trolley chassis 13. A grounding switch bracket 6 is provided in the cable room 3, and a three-phase grounding knife 28 is rotatably connected on the grounding switch bracket 6.

[0065] Combined with attachment Figure 8 , Attachment Figure 16 , Attachment Figure 18 , Attachment Figure 19 , Attachment Figure 20 , Attachment Figure 21 , Attachment Figure 22 and attached Figure 23A trolley lock valve 22 is provided at the bottom of the trolley chamber 2, and a grounding lock valve 29 is hingedly connected to the grounding switch bracket 6. The top of the trolley lock valve 22 and the grounding lock valve 29 are coaxially arranged with an outer oil chamber 38 and an inner oil chamber 39. A hydraulically controlled sliding floating valve ring 35 is provided in the outer oil chamber 38. A spring is provided at the end of the floating valve ring 35 to extend the floating valve ring 35. A fixed deflector sleeve 36 is provided in the inner oil chamber 39. A gap is left between the deflector sleeve 36 and the inner oil chamber 39. A connecting groove 40 is provided in the middle of the outer oil chamber 38 and the inner oil chamber 39. A deflector ring 41 is provided in the middle of the deflector sleeve 36. The deflector ring 41 extends between the connecting groove 40 to separate and isolate the two sides. A deflector groove 42 is provided on the inner ring of the upper part of the floating valve ring 35 to connect the two sides of the connecting groove 40.

[0066] Combined with attachment Figure 8 , Attachment Figure 16 , Attachment Figure 18 , Attachment Figure 19 , Attachment Figure 20 , Attachment Figure 21 , Attachment Figure 22 and attached Figure 23 A first axially movable piston rod 30 is provided in the trolley lock valve 22, and a second axially movable piston rod 23 is provided in the grounding lock valve 29. A piston 45 movable in the deflector sleeve 36 is provided in the middle of the first piston rod 30 and the second piston rod 23, and the top end of the first piston rod 30 is hingedly connected to the bottom of the grounding knife 28.

[0067] Combined with attachment Figure 18 A grounding lock pressure supply interface 34 is provided at the end of the grounding lock valve 29. Hydraulic oil is introduced into the grounding lock pressure supply interface 34 to push the floating valve ring 35 and compress the spring. When the floating valve ring 35 is pushed by the hydraulic oil to move to the bottom dead point, the deflection groove 42 just connects the two sides of the connecting groove 40. When hydraulic oil is not introduced into the grounding lock pressure supply interface 34, the spring pushes the floating valve ring 35, and the two sides of the connecting groove 40 cannot be connected.

[0068] Combined with attachment Figure 22 and attached Figure 23 Similarly, a trolley lock pressure supply interface 47 is provided in the middle of the trolley lock valve 22. Hydraulic oil is introduced into the trolley lock pressure supply interface 47 so that the deflection groove 42 just connects the two sides of the connecting groove 40. When hydraulic oil is not introduced, the two sides of the connecting groove 40 cannot be connected.

[0069] Since there is a gap between the deflector sleeve 36 and the inner oil chamber 39, when the piston 45 moves axially inside the deflector sleeve 36, it will drive the hydraulic oil inside the deflector sleeve 36 to flow in the same direction. The hydraulic oil flows through the gap between the deflector sleeve 36 and the inner oil chamber 39 to the connecting groove 40. Here, the deflector groove 42 is not connected to the connecting groove 40, and the hydraulic oil is blocked by the deflector ring 41 and cannot continue to flow. Since the hydraulic oil cannot be compressed, the piston 45 cannot move axially freely in this state. If the deflector groove 42 connects the two sides of the connecting groove 40, the hydraulic oil can flow through the deflector groove 42 to the other side of the connecting groove 40 and finally return to the deflector sleeve 36. In this state, the piston 45 can move axially freely.

[0070] In summary, the first piston rod 30 or the second piston rod 23 can be locked by supplying hydraulic oil to the grounding lock pressure supply interface 34 or the trolley lock pressure supply interface 47. Conversely, unlocking can be achieved by releasing pressure through the grounding lock pressure supply interface 34 or the trolley lock pressure supply interface 47.

[0071] Combined with attachment Figure 5 , Attachment Figure 6 , Attachment Figure 7 , Attachment Figure 8 , Attachment Figure 11 , Attachment Figure 12 and attached Figure 13 A lever 17 for controlling the opening and closing of the circuit breaker 12 is provided at the bottom of the circuit breaker 12, and an insulating pull rod 16 that is movable in the vertical direction is provided above the end of the lever 17. A slider 21 that slides toward the outside of the slide rail 5 is provided in the trolley chassis 13. A cross 18 is hingedly provided at the end of the lever 17, and a first connecting rod 19 is hingedly provided at the top of the cross 18. The end of the first connecting rod 19 is hingedly connected to the bottom of the insulating pull rod 16, and a second connecting rod 20 is hingedly provided at the bottom of the cross 18. The end of the second connecting rod 20 is hingedly connected to the top of the slider 21. The end of the lever 17 moves upward to drive the insulating pull rod 16 to move upward to close the circuit breaker 12, and at the same time, the slider 21 is retracted into the trolley chassis 13. The slide rail 5 is provided with a slider groove 27. The end of the slider 21 can pass through the slider groove 27 and move to the outside of the slide rail 5. The end of the lever 17 moves downward to drive the insulating pull rod 16 to move downward to open the circuit breaker 12, and at the same time, the slider 21 is extended to the outside of the slide rail 5.

[0072] Combined with attachment Figure 2 , Attachment Figure 3 , Attachment Figure 9 , Attachment Figure 10 , Attachment Figure 14 , Attachment Figure 15 and attached Figure 28A flip plate 7 is hingedly provided on the outer side of the slide rail 5, and the slider 21 extends outward from the slide rail 5 to push the flip plate 7 upward and flip it. A circuit breaker valve 8 is provided on the protective plate 4 above the flip plate 7. A third piston rod 9 that is movable in a vertical direction is provided in the circuit breaker valve 8. A third connecting rod 10 is hingedly connected to the bottom of the third piston rod 9, and the end of the third connecting rod 10 is hingedly connected to the flip plate 7.

[0073] Combined with attachment Figure 8 A pin block 24 is provided at the outer end of the second piston rod 23, and a first stopper 25 is provided in the trolley chassis 13, which can be pressed against the outer end surface of the pin block 24. A second stopper 26 is provided on the slider 21. When the slider 21 extends out of the slide rail 5, the side surface of the second stopper 26 is pressed against the end surface of the pin block 24 facing the trolley lock valve 22.

[0074] During the process of pushing the trolley chassis 13 into the trolley chamber 2, the position before entering the trolley chamber 2 is called the maintenance position, and the position after being pushed in is called the test position. The position where the contacts of the circuit breaker 12 contact the contacts at the end of the busbar is called the working position. When the trolley chassis 13 is in the maintenance position and the test position, the first stopper 25 is slightly far away from the pin block 24 and the two cannot contact each other. When the trolley chassis 13 is continuously pushed from the test position to the working position, the first stopper 25 will continue to approach the pin block 24 and press it tightly. After pressing tightly, the trolley chassis 13 will continue to be pushed to the working position, and the second piston rod 23 will be pushed and continuously retracted. When the trolley chassis 13 is pushed into the working position, the second piston rod 23 will also retract to the limit.

[0075] When the grounding knife 28 is in the closed state, it will flip upward to a horizontal state. In this state, the grounding knife 28 pulls the first piston rod 30 to extend to the limit. When the grounding knife 28 is in the open state, it will flip downward to a drooping state. In this state, the grounding knife 28 pulls the first piston rod 30 to retract to the limit.

[0076] In summary, when the handcart lock valve 22 is depressurized, the second piston rod 23 is locked, and the handcart chassis 13 cannot push the second piston rod 23 to retract or move to the working position. When the ground lock valve 29 is depressurized, the grounding knife 28 cannot be flipped over to perform opening and closing operations.

[0077] Combined with attachment Figure 19 , Attachment Figure 22 , Attachment Figure 23 and attached Figure 28 The circuit breaker valve 8, the trolley lock valve 22 and the grounding lock valve 29 are all provided with a slidable valve core 37, and a guide groove 43 is provided on the outside of the valve core 37. The circuit breaker valve 8, the trolley lock valve 22 and the grounding lock valve 29 are all provided with three hydraulic oil circuits. When the valve core 37 slides to different positions, the guide groove 43 selectively connects two of the oil ports and closes the other oil port, or changes the combination of the connected oil ports.

[0078] Combined with attachment Figure 19 , Attachment Figure 20 , Attachment Figure 21 , Attachment Figure 22 and attached Figure 23 A cavity 44 is provided inside the valve core 37 in the grounding lock valve 29. The end of the first piston rod 30 extends into the cavity 44 and is provided with a snap ring 46 that matches the cavity 44. The snap ring 46 can move slightly in the cavity 44. The valve core 37 in the circuit breaker valve 8 is fixedly connected to the third piston rod 9, and the valve core 37 in the trolley lock valve 22 is fixedly connected to the second piston rod 23.

[0079] The three hydraulic oil circuits set for the trolley lock valve 22 are the second reversing valve interface 48, the second oil pump interface 49 and the second oil tank interface 50. The second reversing valve interface 48 is located between the second oil pump interface 49 and the second oil tank interface 50. By moving the valve core 37 in the trolley lock valve 22, the second reversing valve interface 48 can be connected to one of the second oil pump interface 49 and the second oil tank interface 50, and the other one is closed by the valve core 37. The same working method is also used for the circuit breaker valve 8 and the grounding lock valve 29.

[0080] The oil circuit switching of the circuit breaker valve 8 , the trolley lock valve 22 and the ground lock valve 29 can be achieved by axially moving the first piston rod 30 , the second piston rod 23 and the third piston rod 9 .

[0081] Combined with attachment Figure 22 and attached Figure 23 For the trolley lock valve 22, when the trolley chassis 13 is in the working position, the second reversing valve interface 48 and the second oil tank interface 50 are connected; when it is in the maintenance position and the test position, the second reversing valve interface 48 and the second oil pump interface 49 are connected.

[0082] Combined with attachment Figure 20 and attached Figure 21 For the grounding lock valve 29, when the grounding knife 28 is closed, the first reversing valve interface 31 is connected to the first oil tank interface 32; when the grounding knife 28 is opened, the first reversing valve interface 31 is connected to the first oil pump interface 33.

[0083] Combined with attachment Figure 15 and attached Figure 28 For the circuit breaker valve 8, when the circuit breaker 12 is closed, the circuit breaker valve interface 59 is connected to the third oil tank interface 60; when the circuit breaker 12 is opened, the circuit breaker valve interface 59 is connected to the third oil pump interface 61.

[0084] Combined with attachment Figure 5 , Attachment Figure 6 , Attachment Figure 11 , Attachment Figure 12 , Attachment Figure 13 , Attachment Figure 24 and attached Figure 25The trolley chassis 13 is provided with a trolley bracket 11, which can be locked with the outer end of the slide rail 5. A screw locker 15 is provided in the trolley chamber 2. A screw 14 for driving the trolley chassis 13 to move is provided on the trolley bracket 11. The end of the screw 14 extends into the screw locker 15, and a plurality of grooves 55 are provided around the end of the screw 14.

[0085] Combined with attachment Figure 24 , Attachment Figure 25 , Attachment Figure 26 and attached Figure 27 The screw locker 15 is provided with a plurality of ball grooves 52 pointing to its center around a circle, and a ball 53 is slidably arranged in the ball groove 52. A sliding ring 51 is slidably arranged at the end of the screw locker 15. The sliding ring 51 is provided with a plurality of extension arms 54. The ends of the extension arms 54 are set as inclined surfaces and extend into the ball groove 52 to press tightly against the balls 53. A hydraulic chamber 56 is provided in the screw locker 15, and the sliding ring 51 is provided with a plunger 57 that cooperates with the hydraulic chamber 56. A screw locker interface 58 is provided on the screw locker 15 to communicate with the hydraulic chamber 56.

[0086] In the above structure, when hydraulic oil is filled into the hydraulic chamber 56, the hydraulic oil drives the sliding ring 51 to move through the plunger 57 and compresses the spring equipped therewith. During this process, the extension arm 54 leaves the ball groove 52, and the ball 53 can move radially freely in the ball groove 52. If the hydraulic chamber 56 is depressurized, the spring pushes the sliding ring 51 to make the extension arm 54 enter the ball groove 52, pushing the ball 53 to move radially inward.

[0087] When the trolley chassis 13 is pushed into the trolley chamber 2, the end of the screw 14 first docks with the screw locker 15. If the hydraulic chamber 56 is pressurized, the ball 53 cannot be stuck in the groove 55, and the screw 14 can rotate freely. If the hydraulic chamber 56 is depressurized, the ball 53 will be pushed by the extension arm 54 to first press against the outer surface of the screw 14. If the screw 14 rotates, the ball 53 will be completely stuck in the groove 55 during the rotation, so that the screw 14 is locked and cannot rotate at all.

[0088] Combined with attachment Figure 29 , which represents the hydraulic pipe connection method of the present device. T refers to the interface at the corresponding position connected to the oil tank of the external hydraulic pump station, and P refers to the interface at the corresponding position connected to the oil pump of the external hydraulic pump station. Among the hydraulic oil interfaces in the circuit breaker valve 8, the trolley lock valve 22, and the ground lock valve 29, the circuit breaker valve interface 59 on the circuit breaker valve 8, the trolley lock pressure supply interface 47 on the trolley lock valve 22, the first reversing valve interface 31 on the ground lock valve 29, and the screw lock interface 58 on the screw lock 15 are connected to the same oil circuit. The ground lock pressure supply interface 34 and the second reversing valve interface 48 are connected to the same oil circuit.

[0089] The first oil tank interface 32, the second oil tank interface 50 and the third oil tank interface 60 are commonly connected to the oil tank of the external hydraulic pump station, and the first oil pump interface 33, the second oil pump interface 49 and the third oil pump interface 61 are connected to the hydraulic oil pump outlet of the external hydraulic pump station. The hydraulic pump station belongs to the common existing technology and is not further described in this application.

[0090] To sum up, in the switch cabinet equipped with this device, when it is necessary to move the trolley chassis 13 to the working position, if the grounding switch 28 is closed, the external hydraulic pump station will relieve the pressure on the trolley lock valve 22 and the screw locker 15 through the grounding lock valve 29, which can simultaneously lock the screw 14 and the second piston rod 23, thereby preventing the trolley chassis 13 from being sent to the working position when the device is grounded.

[0091] In particular, when it is necessary to disconnect the grounding knife 28 so as to operate the trolley chassis 13 to change its position, since the opening and closing process of the grounding knife 28 cannot be completed instantly, the grounding knife 28 still has a contact surface with the grounding contact during the process of rotating from a standstill. It is necessary to wait until the grounding knife 28 is completely out of contact with the grounding contact before the grounding lock valve 29 can switch the oil circuit. In this regard, the retaining ring 46 can meet this requirement. Specifically, when the grounding knife 28 starts to rotate, it simultaneously drives the first piston rod 30 to retract, but the root end of the first piston rod 30 is not fixed to the valve core 37, but the retaining ring 46 first slides a distance in the valve core 37 before it can contact the air space in the valve core 37. The retaining ring 46 contacts the inner wall of the bottom of the cavity in the valve core 37, and is thereby driven by the first piston rod 30 to move downward synchronously. During the period from when the grounding knife 28 starts to rotate to when the retaining ring 46 contacts the inner wall of the bottom of the cavity in the valve core 37, the valve core 37 cannot start to move downward immediately due to its own inertia and the viscosity of the hydraulic oil surrounding it, but still maintains the original state of connecting the first reversing valve interface 31 and the first oil tank interface 32. The shape of the cavity in the valve core 37 is specifically designed according to the rotation speed of the grounding knife 28, so that the retaining ring 46 contacts the inner wall of the bottom of the cavity in the valve core 37 only when the grounding knife 28 is completely out of contact with the grounding contact, so as to realize the short hysteresis of the oil circuit switching relative to the grounding knife 28.

[0092] When the grounding knife 28 needs to be closed, if the circuit breaker 12 is in the closed state or the trolley chassis 13 is in the working position, the external hydraulic pump station will release the pressure on the grounding lock valve 29 through the circuit breaker valve 8 or the trolley lock valve 22, which can lock the first piston rod 30 to prevent the circuit breaker 12 from being grounded when closed.

[0093] In addition, when the trolley chassis 13 is in the working position and the circuit breaker 12 is in the closed state, the second stop 26 on the slider 21 will also be pressed against the pin block 24, so that the first stop 25 cooperates with the second stop 26 to clamp the pin block 24 from both sides. Since the circuit breaker 12 is in the closed state, the circuit breaker valve 8 is in the pressure relief valve position in this state. Since the trolley lock pressure supply interface 47 of the trolley lock valve 22 is connected with the circuit breaker valve interface 59, the second piston rod 23 is locked in this state. The trolley chassis 13 clamps the pin block 24 on the locked second piston rod 23 through the first stop 25 and the second stop 26. Therefore, the trolley chassis 13 cannot leave the working position in this state.

[0094] The above description of the present invention and its embodiments is non-limiting, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the invention, without creatively designing a structure and embodiment similar to the technical solution, they shall fall within the scope of protection of the present invention.

Claims

1. A switch cabinet interlocking mechanism, comprising a main cabinet body (1), a trolley chamber (2) and a cable chamber (3), wherein the trolley chamber (2) and the cable chamber (3) are respectively located on both sides of the main cabinet body (1), a slide rail (5) is provided on the side of the trolley chamber (2), a guard plate (4) is provided above the slide rail (5), the trolley chamber (2) is slidably connected to a trolley chassis (13) through the slide rail (5), a circuit breaker (12) is provided on the trolley chassis (13), a grounding switch bracket (6) is provided in the cable chamber (3), and a three-phase grounding knife (28) is rotatably connected to the grounding switch bracket (6), characterized in that: A trolley lock valve (22) is provided at the bottom of the trolley chamber (2), and a grounding lock valve (29) is hingedly connected on the grounding switch bracket (6). The tops of the trolley lock valve (22) and the grounding lock valve (29) are coaxially arranged with an outer oil chamber (38) and an inner oil chamber (39). A hydraulically controlled sliding floating valve ring (35) is provided in the outer oil chamber (38), and a fixed deflection sleeve (36) is provided in the inner oil chamber (39). A gap is left between the deflection sleeve (36) and the inner oil chamber (39). A connecting groove (40) is provided in the middle of the outer oil chamber (38) and the inner oil chamber (39). A deflection ring (41) is provided in the middle of the deflection sleeve (36). The deflection ring (41) extends into the gap of the connecting groove (40) and separates and isolates the two sides thereof. A deflection groove (42) is provided on the inner ring of the upper part of the floating valve ring (35) to connect the two sides of the connecting groove (40). An axially movable first piston rod (30) is provided in the grounding lock valve (29), an axially movable second piston rod (23) is provided in the trolley lock valve (22), the top end of the first piston rod (30) is hingedly connected to the bottom of the grounding knife (28), a piston (45) is provided in the middle of the first piston rod (30) and slides inside the deflector sleeve (36) in the grounding knife (28), and a piston (45) is provided in the middle of the second piston rod (23) and slides inside the deflector sleeve (36) in the trolley lock valve (22).

2. A switch cabinet interlocking mechanism according to claim 1, characterized in that: The bottom of the circuit breaker (12) is provided with a lever (17) for controlling the opening and closing of the circuit breaker (12), and an insulating pull rod (16) movable in a vertical direction is provided above the end of the lever (17). A slider (21) sliding toward the outside of the slide rail (5) is provided in the trolley chassis (13). A crossbar (18) is hingedly provided at the end of the lever (17), and a first connecting rod (19) is hingedly provided at the top of the crossbar (18). The end of the first connecting rod (19) is hingedly connected to the bottom of the insulating pull rod (16). The bottom of the crossbar (18) is hingedly provided with a second connecting rod (20), and the end of the second connecting rod (20) is hingedly connected to the top of the slider (21). The end of the lever (17) moves upward to drive the insulating pull rod (16) to move upward to close the circuit breaker (12), and at the same time, the slider (21) is retracted into the trolley chassis (13). The end of the lever (17) moves downward to drive the insulating pull rod (16) to move downward to open the circuit breaker (12), and at the same time, the slider (21) is extended outward to the outside of the slide rail (5).

3. The switch cabinet interlocking mechanism according to claim 2, characterized in that: A pin block (24) is provided at the outer end of the second piston rod (23), a first stopper (25) is provided in the trolley chassis (13) and can be pressed against the outer end surface of the pin block (24), and a second stopper (26) is provided on the slider (21). When the slider (21) extends out of the slide rail (5), the side surface of the second stopper (26) presses against the end surface of the pin block (24) facing the trolley lock valve (22).

4. The switch cabinet interlocking mechanism according to claim 2, characterized in that: A flip plate (7) is hingedly provided on the outer side of the slide rail (5), and the slider (21) extends outward from the slide rail (5) to push the flip plate (7) upward and flip it. A circuit breaker valve (8) is provided on the protective plate (4) above the flip plate (7), and a third piston rod (9) movable in a vertical direction is provided in the circuit breaker valve (8). A third connecting rod (10) is hingedly provided at the bottom of the third piston rod (9), and the end of the third connecting rod (10) is hingedly connected to the flip plate (7).

5. The switch cabinet interlocking mechanism according to claim 4, characterized in that: The circuit breaker valve (8), the trolley lock valve (22) and the ground lock valve (29) are each provided with a slidable valve core (37), and a guide groove (43) is provided on the outside of the valve core (37). The circuit breaker valve (8), the trolley lock valve (22) and the ground lock valve (29) are each provided with three hydraulic oil circuits. When the valve core (37) slides to different positions, the guide groove (43) selectively connects two of the oil ports and closes the other oil port.

6. The switch cabinet interlocking mechanism according to claim 5, characterized in that: A cavity (44) is provided inside the valve core (37) in the ground lock valve (29). The end of the first piston rod (30) extends into the cavity (44) and is provided with a snap ring (46) that matches the cavity (44). The snap ring (46) can move slightly in the cavity (44).

7. The switch cabinet interlocking mechanism according to claim 5, characterized in that: The valve core (37) in the circuit breaker valve (8) is fixedly connected to the third piston rod (9), and the valve core (37) in the trolley lock valve (22) is fixedly connected to the second piston rod (23).

8. The switch cabinet interlocking mechanism according to claim 1, characterized in that: The trolley chassis (13) is provided with a trolley bracket (11), which can be locked with the outer end of the slide rail (5), and a screw locker (15) is provided in the trolley chamber (2). The trolley bracket (11) is provided with a screw (14) for driving the trolley chassis (13) to move, and the end of the screw (14) extends into the screw locker (15), and a plurality of grooves (55) are provided around the end of the screw (14).

9. The switch cabinet interlocking mechanism according to claim 8, characterized in that: A plurality of ball grooves (52) pointing to the center of the screw locker (15) are arranged around the screw locker (15), and balls (53) are slidably arranged in the ball grooves (52). A sliding ring (51) is slidably arranged at the end of the screw locker (15), and the sliding ring (51) is provided with a plurality of extension arms (54). The ends of the extension arms (54) are arranged as inclined surfaces and extend into the ball grooves (52) to press against the balls (53). A hydraulic chamber (56) is provided in the screw locker (15), and the sliding ring (51) is provided with a plunger (57) that matches the hydraulic chamber (56).

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