High-voltage switch cabinet

Abstract

The invention relates to the technical field of switch cabinets, and particularly discloses a high-voltage switch cabinet which comprises a cabinet body, a cabinet door is hinged to the front end of the cabinet body, a static contact is arranged in the cabinet body, and the high-voltage switch cabinet further comprises a handcart assembly, a pushing assembly and a protection mechanism which are arranged in the cabinet body. The pushing assembly comprises a screw rotationally arranged in the cabinet body and a moving block in threaded fit with the screw, the protection mechanism comprises a locking assembly and a buffer assembly, the locking assembly comprises a ratchet structure and a driving structure, and the driving structure is used for driving the ratchet structure to lock the screw in one direction when the moving block moves relative to the handcart. The buffering assembly comprises a rotating piece arranged at the end of the screw and a buffering structure. According to the invention, the pushing assembly can be locked when the movement of the handcart is subjected to resistance, so that the handcart is prevented from continuously moving and further being damaged, and meanwhile, the situation that the handcart suddenly stops moving and hurts an operator can be avoided.

Description

Technical Field

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

[0002] High-voltage switchgear is a complete set of equipment used to control, protect and monitor high-voltage circuits in power systems. Among them, the most widely used is the trolley switchgear. Various components for controlling circuit switches and other operations are installed inside the trolley switchgear. The trolley switchgear in related technologies is mostly composed of a cabinet, a trolley, a circuit breaker, a plug-in device and an operating mechanism. When in use, open the cabinet door and push the trolley as a whole into the trolley chamber on the switchgear through the operating mechanism to make the moving contact contact with the static contact to turn on the circuit. By manually controlling the trolley, the switching and operation of the switchgear can be easily achieved. The operation is simple and convenient, and it is also convenient to repair and replace the components inside the switchgear.

[0003] The patent document with publication number CN212935352U discloses a switch cabinet trolley, including a trolley body and a fixed frame connected to the switch cabinet, the trolley body is provided with a cavity for accommodating a fuse, the fixed frame is provided with a propulsion mechanism, the propulsion mechanism includes a transmission rod and a transmission member, the transmission member is connected to the trolley body, and the transmission member and the trolley body are driven to reciprocate along the axial direction of the transmission rod by rotating the transmission rod. This patent solves the problem that the existing trolley is directly pushed in, making the trolley run unsteadily. The trolley can be driven to move in the switch cabinet through the propulsion mechanism, making the trolley run more smoothly, more reliable and safer.

[0004] When the switch cabinet provided in the above patent document pushes the trolley outward through the propulsion mechanism, the staff usually performs manual operation directly from the outside of the cabinet. If some situation occurs inside the cabinet at this time and the movement of the trolley encounters resistance, the staff may not discover it in time and the trolley may not be able to stop moving immediately, which may cause further damage to the trolley. Summary of the invention

[0005] The present invention provides a high-voltage switch cabinet, aiming to solve the problem that when the switch cabinet in the related art pushes a trolley outward, usually the staff directly performs manual operation outside the cabinet body. If some situation occurs in the cabinet body at this time so that the movement of the trolley encounters resistance, the staff may not discover it in time and the trolley may not be able to stop moving immediately, which may cause further damage to the trolley.

[0006] A high-voltage switch cabinet of the present invention comprises a cabinet body, a cabinet door is hingedly connected to the front end of the cabinet body, a trolley chamber is provided in the cabinet body, a static contact is installed in the trolley chamber, and a trolley assembly, a propulsion assembly and a protection mechanism are arranged in the cabinet body; The trolley assembly comprises a trolley slidably arranged in the trolley chamber and a contact arm arranged on the trolley, wherein one end of the contact arm is provided with a moving contact adapted to the static contact; The propulsion assembly includes a screw that rotates in the trolley chamber and a moving block that cooperates with the screw thread. When the trolley moves normally, the moving block can push the trolley to move synchronously. When the movement of the trolley encounters resistance, the moving block can move relative to the trolley. The protection mechanism includes a locking assembly and a buffer assembly. The locking assembly includes a ratchet structure and a driving structure. The driving structure is used to drive the ratchet structure to unidirectionally lock the screw when the moving block moves relative to the trolley. The buffer assembly includes a rotating part and a buffer structure arranged at the end of the screw. The buffer structure is used to enable the rotating part to rotate synchronously with the screw when the screw can rotate normally, and to enable the rotating part to rotate relative to the screw in the locking direction of the screw when the screw stops rotating.

[0007] Preferably, a push block 1 and a push block 2 are provided on the outer side of the screw rod along its axial sliding sleeve, push block 1 is provided on the side of the moving block away from the cabinet door, and a rod is connected between push block 1 and the moving block, push block 2 is provided on the side of the moving block close to the cabinet door, and an elastic member 1 is connected between push block 2 and the moving block, and the lower end of the trolley has an installation cavity, and push block 1 and push block 2 are respectively abutted against the front and rear ends of the installation cavity to push the trolley to move.

[0008] When the trolley can move normally, the trolley can be pushed inward by pushing block 1, or can be pushed outward by pushing block 2. When the movement of the trolley encounters resistance, the moving block will move relative to the trolley to provide driving force for the protective mechanism.

[0009] Preferably, a slide rail and a driving member are provided in the trolley chamber. The slide rail is arranged along the front and rear direction of the cabinet. The driving member is used to drive the slide rail to move along the height direction of the cabinet. A roller is installed at the lower end of the trolley. The roller can roll in the slide rail, so that the trolley can slide with the cabinet through the slide rail.

[0010] The trolley can be positioned during its movement and the friction of the trolley in the cabinet can be reduced, making the movement of the trolley easier and more labor-saving.

[0011] Preferably, the thread on the screw has two sections, and the two sections are transitionally connected. The thread close to the cabinet door is defined as thread one, and the thread away from the cabinet door is defined as thread two. The pitch of thread one is greater than the pitch of thread two, and the length of thread one is greater than the length of thread two.

[0012] The moving speed of the trolley in the first half of the stroke is faster, which can improve the pushing efficiency of the trolley, while the moving speed in the second half of the stroke is slower, which can better control the trolley and reduce the possibility of collision between the moving contact and the static contact.

[0013] Preferably, the ratchet structure includes matching ratchet bars and ratchet teeth, the ratchet bar is horizontally arranged in the trolley chamber, a fixed plate is installed at the lower end of the trolley, a slide groove is arranged on the fixed plate, the slide groove is arranged along the front and rear direction of the cabinet, a slider is arranged in the slide groove for sliding, the ratchet is longitudinally slidably arranged on the slider, the lower end of the ratchet passes through the fixed plate and extends downward, an elastic member 2 for driving the ratchet to reset is arranged between the upper end of the ratchet and the slider, the slider and the push block are magnetically matched, so that the two can move synchronously, and the driving structure is used to drive the ratchet to move downward and cooperate with the ratchet bar when the moving block moves relative to the trolley, so as to lock the screw in one direction.

[0014] Preferably, the driving structure includes a guide block arranged on the fixed plate, the side of the guide block away from the cabinet door is in the shape of an inclined surface, and the inclined surface gradually tilts downward in the direction close to the cabinet door. A contact portion is connected to the ratchet tooth, and the contact portion can contact the inclined surface on the guide block during the sliding of the slider along the slide groove.

[0015] When the trolley can move normally, the ratchet and the ratchet bar disengage, so that the screw is in an unlocked state. At this time, the trolley can be driven to move by the rotation of the screw. When the movement of the trolley encounters resistance, the ratchet and the ratchet bar cooperate to put the screw in a one-way locked state, which can prevent the trolley from continuing to move and causing further damage.

[0016] Preferably, a shell is rotatably provided at one end of the screw toward the cabinet door, a mounting hole for installing the shell is provided at the front end of the cabinet, a rotating member is rotatably provided in the shell, a slot is provided on the rotating member, the buffer structure includes a square rod and a sliding plate, the square rod is provided on the side of the rotating member facing the screw, the sliding plate is slidably sleeved on the outside of the square rod and can rotate synchronously with the square rod, a plurality of protrusions 1 are provided on the end of the screw facing the rotating member, a plurality of protrusions 2 are provided on the end face of the sliding plate facing the screw, protrusions 1 and protrusions 2 can be snap-fitted together to allow the screw and the sliding plate to rotate synchronously.

[0017] Preferably, a slope 1 is provided on the first protrusion, and the slope 1 gradually inclines in the direction away from the screw along the rotation direction of the screw, and a slope 2 is provided on the second protrusion to match the slope 1, so that after the screw stops rotating, the protrusion 2 can be moved in the direction away from the screw under the guidance of the slopes 1 and 2, and an elastic member 3 is provided between the sliding plate and the rotating member to drive the sliding plate to reset.

[0018] Preferably, a handle for pulling the trolley to move is installed on the side of the trolley facing the cabinet door.

[0019] Preferably, an observation window is provided on the cabinet door.

[0020] The beneficial effects of the present invention are: 1. The present invention is provided with a protective mechanism. When the trolley is pushed outward by the propulsion assembly, if the movement of the trolley encounters resistance, the screw can be locked in one direction by the locking assembly to prevent the trolley from continuing to move and causing further damage. At the same time, the buffer assembly can make the rotating part and the screw rotate relative to each other to prevent the trolley from suddenly stopping and causing harm to the operator.

[0021] 2. The screw of the present invention has two sections of threads with different pitches, so that the trolley moves faster in the first half of the stroke close to the cabinet door to improve the efficiency of pushing the trolley in and out. At the same time, the trolley moves slower in the second half of the stroke close to the static contact to better control the trolley and reduce the possibility of collision between the moving contact and the static contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 It is a schematic structural diagram of the present invention cut along the longitudinal direction.

[0024] Figure 3 It is a schematic diagram of the structure of the propulsion assembly of the present invention.

[0025] Figure 4 It is a schematic diagram of the assembly structure of the trolley assembly and the propulsion assembly of the present invention.

[0026] Figure 5 It is a schematic diagram of the assembly structure of the ratchet structure and the fixing plate of the present invention.

[0027] Figure 6 It is a schematic diagram of the assembly structure of the ratchet and the slider of the present invention.

[0028] Figure 7 It is a structural schematic diagram of the buffer structure of the present invention.

[0029] Figure 8 It is a schematic diagram of the assembly structure of the sliding plate and the rotating member of the present invention.

[0030] Reference numerals: 1. Cabinet body; 11. Cabinet door; 111. Observation window; 12. Static contact; 13. Slide rail; 21. Cart; 211. Roller; 22. Contact arm; 23. Moving contact; 24. Fixed plate; 241. Slide groove; 31. Screw; 311. Shell; 312. Bump 1; 32. Moving block; 33. Push block 1; 331. Rod; 34. Push block 2; 341. Elastic member 1; 41. Rotating member; 411. Slot; 412. Square rod; 42. Ratchet bar; 43. Ratchet; 431. Elastic member 2; 432. Contact portion; 44. Slider; 45. Guide block; 46. Sliding plate; 461. Bump 2; 462. Elastic member 3. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0032] like Figures 1 to 8 As shown, a high-voltage switch cabinet of the present invention comprises a cabinet body 1, a trolley assembly, a propulsion assembly and a protection mechanism.

[0033] A cabinet door 11 is hinged at the front end of the cabinet body 1. A trolley chamber is provided in the cabinet body 1. A static contact 12 is provided in the trolley chamber. The trolley assembly includes a trolley 21 slidably arranged in the trolley chamber and a contact arm 22 arranged on the trolley 21. A moving contact 23 adapted to the static contact 12 is provided at one end of the contact arm 22.

[0034] Specifically, Figures 1 to 4 As shown, when the trolley 21 needs to be delivered into the cabinet 1, the cabinet door 11 is opened, the trolley 21 is pushed into the trolley chamber, and then the cabinet door 11 is closed. The trolley 21 is driven by the propulsion assembly to move in the direction close to the static contact 12, and the contact arm 22 and the moving contact 23 are driven to move synchronously until the moving contact 23 is connected with the static contact 12 in the cabinet 1 to achieve circuit connection. When the trolley 21 needs to be pulled out of the cabinet 1, the trolley 21 is driven by the propulsion assembly to move in the direction away from the static contact 12, and the contact arm 22 and the moving contact 23 are driven to move synchronously, so that the moving contact 23 is disconnected from the static contact 12, and then the cabinet door 11 is opened, and the trolley 21 is pulled outward until the trolley 21 is completely pulled out of the cabinet 1. During the movement of the trolley 21, a protective mechanism is provided to prevent the trolley 21 from being further damaged when the movement of the trolley 21 encounters resistance.

[0035] The pushing assembly includes a screw rod 31 rotatably arranged in the trolley chamber, and a moving block 32 threadedly matched with the screw rod 31. When the trolley 21 moves normally, the moving block 32 can push the trolley 21 to move synchronously. When the movement of the trolley 21 encounters resistance, the moving block 32 can move relative to the trolley 21. In this embodiment, a push block 1 33 and a push block 2 34 are provided on the outer side of the screw rod 31 along its axial sliding sleeve. The push block 1 33 is arranged on the side of the moving block 32 away from the cabinet door 11, and a rod 331 is connected between the push block 1 33 and the moving block 32. The push block 2 34 is arranged on the side of the moving block 32 close to the cabinet door 11, and an elastic member 1 341 is connected between the push block 2 34 and the moving block 32. The lower end of the trolley 21 has an installation cavity, and the push block 1 33 and the push block 2 34 are respectively abutted against the front and rear ends of the installation cavity to push the trolley 21 to move.

[0036] Specifically, Figures 1 to 4 As shown, when the screw rod 31 is defined as rotating in the clockwise direction, the moving block 32 can be driven to move in the direction close to the cabinet door 11, and when the screw rod 31 is rotated in the counterclockwise direction, the moving block 32 can be driven to move in the direction away from the cabinet door 11. When the trolley 21 needs to be pushed inward, the screw rod 31 is rotated counterclockwise, and the moving block 32 is driven to move in the direction close to the static contact 12 through the threaded transmission between the screw rod 31 and the moving block 32, and the push block 1 33 is driven to move synchronously through the rod 331, and at the same time, the trolley 21 in contact with the push block 1 33 is pushed to move synchronously until the moving contact 23 at the front end of the trolley 21 is connected with the static contact 12; when the trolley 21 needs to be pushed outward, the screw rod 31 is rotated clockwise to drive the moving block 32 to The trolley 21 moves in a direction away from the static contact 12, and drives the push block 2 34 to move synchronously through the elastic member 1 341, and at the same time pushes the trolley 21 in contact with the push block 2 34 to move synchronously until the trolley 21 moves to the side close to the cabinet door 11; in the process of pushing the trolley 21 outward, if some circumstances occur in the cabinet 1 that cause the movement of the trolley 21 to encounter resistance, the trolley 21 will stop moving, and the push block 2 34 will stop moving at the same time. At this time, the screw rod 31 continues to be rotated clockwise, and the moving block 32 and the push block 1 33 will continue to move. That is, when the movement of the trolley 21 encounters resistance, the moving block 32 and the push block 1 33 will move relative to the trolley 21, and compress the elastic member 1 341 to accumulate force, thereby providing driving force for the subsequent protective mechanism.

[0037] The protection mechanism includes a locking assembly and a buffer assembly. The locking assembly includes a ratchet structure and a driving structure. The driving structure is used to drive the ratchet structure to unidirectionally lock the screw 31 when the moving block 32 moves relative to the trolley 21. The buffer assembly includes a rotating member 41 and a buffer structure provided at the end of the screw 31. A slot 411 is provided on the rotating member 41. The buffer structure is used to enable the rotating member 41 to rotate synchronously with the screw 31 when the screw 31 can rotate normally, and to enable the rotating member 41 to rotate relative to the screw 31 along the locking direction of the screw 31 when the screw 31 stops rotating.

[0038] Specifically, Figures 2 to 8 As shown, when the trolley 21 can move normally, the ratchet structure is in an unlocked state, and the screw rod 31 is not locked, so that the screw rod 31 can rotate normally. At this time, under the action of the buffer structure, the rotating member 41 and the screw rod 31 can rotate synchronously, that is, when the screw rod 31 needs to be rotated, a tool such as a rocker is inserted into the slot 411 provided on the rotating member 41, and the rocker is turned, which can drive the rotating member 41 and the screw rod 31 to rotate, and the trolley 21 needs to be pushed in and out; when the trolley 21 needs to be pushed out, the rocker is turned clockwise to drive the rotating member 41 and the screw rod 31 to rotate. The movable screw 31 rotates clockwise. During this process, if the trolley 21 encounters resistance and stops moving, the movable block 32 will move relative to the trolley 21. At this time, the ratchet structure will switch to a locked state and unidirectionally lock the screw 31, so that the screw 31 cannot continue to rotate in the clockwise direction, but can rotate in the counterclockwise direction. At this time, continue to rotate the rocker clockwise, the screw 31 remains stationary, and the rotating member 41 will rotate relative to the screw 31 to prevent the screw 31 from suddenly locking and causing harm to the staff operating the rocker.

[0039] In some embodiments, a slide rail 13 and a driving member are provided in the trolley chamber. The slide rail 13 is arranged along the front and rear direction of the cabinet 1. The driving member is used to drive the slide rail 13 to move along the height direction of the cabinet 1. A roller 211 is installed at the lower end of the trolley 21. The roller 211 can roll in the slide rail 13, so that the trolley 21 can slide with the cabinet 1 through the slide rail 13.

[0040] Specifically, Figures 1 to 4As shown, in the initial state, the height of the slide rail 13 is higher than the height of the moving block 32, the push block 1 33 and the push block 2 34 in the trolley room. When the trolley 21 needs to be sent into the trolley room, the cabinet door 11 is opened, and the transport device for transporting the trolley 21 is moved to the front side of the cabinet body 1, and the height of the transport device is adjusted so that the roller 211 at the lower end of the trolley 21 is consistent with the height of the slide rail 13. At this time, the trolley 21 is pushed inward, and the roller 211 rolls in the slide rail 13 until the trolley 21 completely enters the trolley room, and then the cabinet door 11 is closed, and the driving member is driven to move the trolley 21 into the trolley room. The drive rail 13 moves downward, and drives the trolley 21 to move downward, so that the installation cavity at the lower end of the trolley 21 is just stuck on the outer side of the push block 1 33 and the push block 2 34, completing the connection between the trolley 21 and the propulsion assembly. At this time, rotating the screw rod 31 can drive the trolley 21 to move; when the trolley 21 needs to be taken out of the trolley chamber, open the cabinet door 11, drive the rail 13 to move upward through the driving member, and drive the trolley 21 to move upward, so that the height of the rail 13 is consistent with the height of the transportation equipment, and then pull the trolley 21 to pull the trolley 21 onto the transportation equipment.

[0041] In some embodiments, the thread on the screw 31 has two sections, and the two sections of the thread are transitionally connected. The thread on the side close to the cabinet door 11 is defined as thread one, and the thread on the side away from the cabinet door 11 is defined as thread two. The pitch of thread one is greater than the pitch of thread two, and the length of thread one is greater than the length of thread two.

[0042] Specifically, Figures 1 to 4 As shown, when the trolley 21 needs to be pushed inward, the screw rod 31 is rotated to drive the moving block 32 and the pushing block 1 33 to move, and the trolley 21 is pushed to move synchronously, so that the trolley 21 can move in the first half of the stroke under the action of the thread 1, and then move in the second half of the stroke under the action of the thread 2, until the moving contact 23 at the front end of the trolley 21 is connected with the static contact 12. Since the pitch of the thread 1 is greater than the pitch of the thread 2, and the length of the thread 1 is greater than the length of the thread 2, when the rotation speed of the screw rod 31 is constant, the moving speed of the trolley 21 in the first half of the stroke is faster to improve the efficiency of pushing and pushing the trolley 21, and the moving speed in the second half of the stroke is slower, so that when the moving contact 23 and the static contact 12 are about to be connected, the trolley 21 can be better controlled to avoid collision between the moving contact 23 and the static contact 12 and cause damage.

[0043] In some embodiments, the ratchet structure includes a matching ratchet bar 42 and a ratchet 43, the ratchet bar 42 is horizontally arranged in the trolley room, a fixed plate 24 is installed at the lower end of the trolley 21, a slide groove 241 is arranged on the fixed plate 24, the slide groove 241 is arranged along the front and rear direction of the cabinet 1, a slider 44 is slidably arranged in the slide groove 241, the ratchet 43 is longitudinally slidably arranged on the slider 44, the lower end of the ratchet 43 penetrates the fixed plate 24 and extends downward, an elastic member 2 431 for driving the ratchet 43 to reset is arranged between the upper end of the ratchet 43 and the slider 44, and the slider 44 and the push block 1 33 The magnetic attraction enables the two to move synchronously. The driving structure is used to drive the ratchet 43 to move downward and cooperate with the ratchet bar 42 when the moving block 32 moves relative to the trolley 21, so as to unidirectionally lock the screw 31. The driving structure includes a guide block 45 arranged on the fixed plate 24. The side of the guide block 45 away from the cabinet door 11 is in the shape of an inclined surface, and the inclined surface gradually tilts downward in the direction close to the cabinet door 11. A contact portion 432 is connected to the ratchet 43. When the slider 44 slides along the slide groove 241, the contact portion 432 can contact the inclined surface on the guide block 45.

[0044] Specifically, Figures 2 to 6As shown, when the trolley 21 can move normally, the slider 44 is located in the slide groove 241 at the end away from the cabinet door 11, and the lower end of the ratchet 43 does not contact the ratchet bar 42. At this time, the ratchet structure is in an unlocked state, and the screw rod 31 is not locked, so that the screw rod 31 can rotate normally to drive the trolley 21 to be pushed in and out. In the process of pushing the trolley 21 outward, some obstacles or other situations may occur, causing the trolley 21 to stop moving due to resistance. If the screw rod 31 is continued to be rotated at this time, the operator may not be able to stop the movement in time. The handcart 21 is further damaged by the detection of the situation. By setting a protective mechanism, when the movement of the handcart 21 encounters resistance, the handcart 21 stops moving, and the moving block 32 moves relative to the handcart 21 under the action of the screw 31, and drives the push block 33 to move, and at the same time drives the slider 44 magnetically matched with the push block 33 to move, so that the slider 44 moves along the slide groove 241 in the direction close to the cabinet door 11. In this process, the contact portion 432 on the ratchet 43 will contact the guide block 4 5, and under the guidance of the inclined surface, the ratchet 43 is driven to move downward, and the elastic member 2 431 is stretched to store force until the ratchet 43 is stuck on the ratchet bar 42, so that the ratchet structure is in a locked state. At this time, the slider 44 stops moving, and the push block 1 33 and the moving block 32 stop moving, so that the screw 31 cannot rotate, and the screw 31 is locked, that is, the trolley 21 cannot continue to move, thereby preventing the trolley 21 from being further damaged. When the staff finds the situation inside the cabinet 1, they open the cabinet door 11 To solve the problem inside the cabinet 1, after the resistance that hinders the movement of the trolley 21 disappears, rotate the screw 31 counterclockwise to drive the moving block 32 to move away from the cabinet door 11, and drive the push block 1 33 and the slider 44 to move. During this process, the ratchet 43 will move upward under the action of the elastic member 2 431, releasing the locking of the screw 31 by the ratchet structure, and then rotate the screw 31 clockwise to drive the moving block 32 to move toward the cabinet door 11, and push the trolley 21 to continue to be pushed outward through the push block 2 34.

[0045] In some embodiments, a shell 311 is provided at one end of the screw 31 that rotates toward the cabinet door 11, and a mounting hole for installing the shell 311 is provided at the front end of the cabinet 1. The rotating member 41 is rotatably provided in the shell 311. The buffer structure includes a square rod 412 and a sliding plate 46. The square rod 412 is provided on the side of the rotating member 41 facing the screw 31. The sliding plate 46 is slidably sleeved on the outer side of the square rod 412 and can rotate synchronously with the square rod 412. A plurality of protrusions 312 are provided on the end of the screw 31 facing the rotating member 41, and a plurality of protrusions 461 are provided on the end face of the sliding plate 46 facing the screw 31. The protrusions 312 and 461 can be snap-fitted to allow the screw 31 and the sliding plate 46 to rotate synchronously.

[0046] Specifically, Figures 2 to 8 As shown, in the initial state, the protrusion 1 312 is inserted into the groove formed between two adjacent protrusions 2 461, and the protrusion 2 461 is inserted into the groove formed between two adjacent protrusions 1 312, so that the protrusion 1 312 and the protrusion 2 461 are engaged with each other. At this time, the screw 31 and the sliding plate 46 can rotate synchronously, and the end of the rocker is inserted into the slot 411 provided on the rotating member 41. Rotating the rocker can drive the rotating member 41 and the square rod 412 to rotate, and drive the sliding plate 46 to rotate, and at the same time drive the screw 31 to rotate, so as to realize the pushing in and pushing out of the trolley 21.

[0047] In some embodiments, a slope 1 is provided on the protrusion 1 312, and the slope 1 gradually tilts in a clockwise direction away from the screw 31. A slope 2 is provided on the protrusion 2 461, which is matched with the slope 1, so that after the screw 31 stops rotating, the protrusion 2 461 can move in a direction away from the screw 31 under the guidance of the slopes 1 and 2. An elastic member 3 462 is provided between the sliding plate 46 and the rotating member 41 for driving the sliding plate 46 to reset.

[0048] Specifically, Figures 2 to 8As shown, when the screw 31 can rotate normally, the rotating member 41 can drive the sliding plate 46 and the screw 31 that are engaged with each other to rotate synchronously regardless of whether it rotates clockwise or counterclockwise. After the screw 31 is locked, the screw 31 stops rotating. At this time, if the rotating member 41 is rotated clockwise, the sliding plate 46 will be driven to rotate clockwise, and the second protrusion 461 will be driven to rotate synchronously. At this time, under the guiding action of the inclined planes 1 and 2, the second protrusion 461 and the sliding plate 46 will move in the direction away from the screw 31, and the elastic member 3 462 will be compressed to store force. In this process, the rotating member 41 and the sliding plate 46 will rotate relative to the screw 31, and the rotation is relatively difficult until the second protrusion 461 is disengaged from the groove formed between the two adjacent protrusions 1 312, thereby releasing the engagement between the screw 31 and the sliding plate 46. At this time, the rotating member 41 continues to rotate. The movable member 41, the rotating member 41 and the sliding plate 46 can continue to rotate relative to the screw rod 31, and the rotation is relatively easy until the protrusion 461 moves to another groove formed between two adjacent protrusions 1 312. At this time, the sliding plate 46 and the protrusion 2 461 will move towards the direction close to the screw rod 31 under the action of the elastic member 3 462, so that the protrusion 2 461 is again inserted into the protrusion 1 312, so that the screw rod 31 and the sliding plate 46 are engaged with each other. At this time, the rotating member 41 continues to be rotated. The rotation of the rotating member 41 will be more difficult. After the screw rod 31 stops rotating, the rotation difficulty of the rotating member 41 is different, which will cause a sound similar to "clicking" during the rotation of the rocker, which is easier to be discovered by the staff operating the rocker, so that the staff can realize that the movement of the trolley 21 inside the cabinet body 1 is blocked, so as to remind the staff to open the cabinet door 11 for maintenance.

[0049] like Figure 2 As shown, a handle for pulling the trolley 21 to move is provided at one end of the trolley 21 facing the cabinet door 11. When the trolley 21 needs to be pulled out of the cabinet body 1, the handle on the trolley 21 can be pulled out.

[0050] like Figure 1 As shown, the cabinet door 11 is provided with an observation window 111, which can observe the movement of the trolley 21 in the cabinet 1 and the connection between the moving contact 23 and the static contact 12, so as to take corresponding measures in time.

[0051] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A high-voltage switch cabinet, comprising a cabinet body (1), a cabinet door (11) being hingedly connected to the front end of the cabinet body (1), a trolley chamber being provided in the cabinet body (1), a static contact (12) being installed in the trolley chamber, and characterized in that: It also includes a trolley assembly, a propulsion assembly and a protective mechanism arranged in the cabinet (1); The trolley assembly comprises a trolley (21) slidably disposed in the trolley chamber and a contact arm (22) disposed on the trolley (21); one end of the contact arm (22) is provided with a moving contact (23) adapted to the stationary contact (12); The propulsion assembly comprises a screw rod (31) rotatably disposed in the trolley chamber, and a moving block (32) threadably engaged with the screw rod (31); when the trolley (21) moves normally, the moving block (32) can push the trolley (21) to move synchronously; when the movement of the trolley (21) encounters resistance, the moving block (32) can move relative to the trolley (21); The protection mechanism comprises a locking assembly and a buffer assembly, the locking assembly comprising a ratchet structure and a driving structure, the driving structure being used to drive the ratchet structure to unidirectionally lock the screw rod (31) when the moving block (32) moves relative to the trolley (21), the buffer assembly comprising a rotating member (41) and a buffer structure provided at the end of the screw rod (31), the buffer structure being used to enable the rotating member (41) to rotate synchronously with the screw rod (31) when the screw rod (31) can rotate normally, and to enable the rotating member (41) to rotate relative to the screw rod (31) in the locking direction of the screw rod (31) when the screw rod (31) stops rotating.

2. A high voltage switch cabinet according to claim 1, characterized in that: A push block 1 (33) and a push block 2 (34) are provided on the outer side of the screw rod (31) along its axial sliding sleeve. The push block 1 (33) is provided on a side of the moving block (32) away from the cabinet door (11), and a rod (331) is connected between the push block 1 (33) and the moving block (32). The push block 2 (34) is provided on a side of the moving block (32) close to the cabinet door (11), and an elastic member 1 (341) is connected between the push block 2 (34) and the moving block (32). The lower end of the trolley (21) has an installation cavity, and the push block 1 (33) and the push block 2 (34) are respectively in contact with the front and rear ends of the installation cavity to push the trolley (21) to move.

3. A high voltage switch cabinet according to claim 1, characterized in that: A slide rail (13) and a driving member are provided in the trolley chamber. The slide rail (13) is provided along the front-rear direction of the cabinet body (1). The driving member is used to drive the slide rail (13) to move along the height direction of the cabinet body (1). A roller (211) is installed at the lower end of the trolley (21). The roller (211) can roll in the slide rail (13), so that the trolley (21) and the cabinet body (1) can slide together through the slide rail (13).

4. A high voltage switch cabinet according to claim 1, characterized in that: The thread on the screw rod (31) has two sections, and the two sections of the thread are transitionally connected. The thread on the side close to the cabinet door (11) is defined as thread one, and the thread on the side away from the cabinet door (11) is defined as thread two. The pitch of thread one is greater than the pitch of thread two, and the length of thread one is greater than the length of thread two.

5. A high voltage switch cabinet according to claim 2, characterized in that: The ratchet structure comprises a ratchet bar (42) and a ratchet (43) adapted to each other. The ratchet bar (42) is horizontally arranged in the trolley chamber. A fixing plate (24) is installed at the lower end of the trolley (21). A slide groove (241) is arranged on the fixing plate (24). The slide groove (241) is arranged along the front-rear direction of the cabinet (1). A slide block (44) is slidably arranged in the slide groove (241). The ratchet (43) is longitudinally slidably arranged on the slide block (44). The lower end of the ratchet (43) penetrates the fixing plate (24). The fixed plate (24) extends downward, and an elastic member 2 (431) for driving the ratchet (43) to reset is provided between the upper end of the ratchet (43) and the slider (44). The slider (44) and the push block 1 (33) are magnetically matched so that the two can move synchronously. The driving structure is used to drive the ratchet (43) to move downward and cooperate with the ratchet bar (42) when the moving block (32) moves relative to the trolley (21), thereby unidirectionally locking the screw rod (31).

6. A high voltage switch cabinet according to claim 5, characterized in that: The driving structure comprises a guide block (45) arranged on the fixed plate (24); a side of the guide block (45) away from the cabinet door (11) is in the shape of an inclined surface, and the inclined surface gradually tilts downward in a direction close to the cabinet door (11); a contact portion (432) is connected to the ratchet (43); and when the slider (44) slides along the slide groove (241), the contact portion (432) can contact the inclined surface on the guide block (45).

7. A high voltage switch cabinet according to claim 1, characterized in that: A housing (311) is rotatably provided at one end of the screw rod (31) facing the cabinet door (11); a mounting hole for mounting the housing (311) is provided at the front end of the cabinet body (1); a rotating member (41) is rotatably provided in the housing (311); a slot (411) is provided on the rotating member (41); a buffer structure comprises a square rod (412) and a sliding plate (46); the square rod (412) is provided on a side of the rotating member (41) facing the screw rod (31); the sliding plate (46) is slidably sleeved on the outside of the square rod (412) and can rotate synchronously with the square rod (412); a plurality of first protrusions (312) are provided at the end of the screw rod (31) facing the rotating member (41); a plurality of second protrusions (461) are provided on the end surface of the sliding plate (46) facing the screw rod (31); the first protrusions (312) and the second protrusions (461) can be engaged with each other so that the screw rod (31) and the sliding plate (46) rotate synchronously.

8. A high voltage switch cabinet according to claim 7, characterized in that: The first projection (312) is provided with an inclined surface 1, which gradually inclines in a direction away from the screw rod (31) along the rotation direction of the screw rod (31), and the second projection (461) is provided with an inclined surface 2 matched with the inclined surface 1, so that after the screw rod (31) stops rotating, the second projection (461) can move in a direction away from the screw rod (31) under the guidance of the inclined surfaces 1 and 2, and an elastic member 3 (462) is provided between the sliding plate (46) and the rotating member (41) for driving the sliding plate (46) to reset.

9. A high voltage switch cabinet according to claim 1, characterized in that: A handle for pulling the trolley (21) to move is installed on one side of the trolley (21) facing the cabinet door (11).

10. A high voltage switch cabinet according to claim 1, characterized in that: An observation window (111) is provided on the cabinet door (11).

Images