A low voltage switch cabinet electric door

Abstract

The present invention relates to the technical field of low-voltage switch cabinets, and discloses an electric door of a low-voltage switch cabinet, comprising a cabinet body, a cabinet door hingedly arranged on the cabinet body and capable of opening or closing the cabinet body, an automatic door opening and closing structure arranged between the cabinet body and the cabinet door, and a locking structure arranged between the cabinet body and the cabinet door, wherein the locking structure comprises a mounting block arranged on the cabinet body, a locking groove recessed on the top surface of the mounting block, a fixing block arranged on the cabinet door above the mounting block, a telescopic groove recessed on the bottom surface of the fixing block, and a locking block arranged for lifting and lowering in the telescopic groove, which is interlaced and matched with the locking groove when descending or is disengaged from the locking groove when ascending, and the lifting and lowering of the locking block is controlled by the opening or closing of the automatic door opening and closing structure. The electric door of the low-voltage switch cabinet ensures the automatic opening and closing of the cabinet door while improving the anti-theft performance of the low-voltage cabinet.

Description

Technical Field

[0001] The invention relates to the technical field of low-voltage switch cabinets, in particular to an electric door of a low-voltage switch cabinet. Background Art

[0002] Low-voltage switch cabinets can realize the conversion or control of electrical energy. Conventional low-voltage switch cabinet doors are manual. After the cabinet door is opened during maintenance, the cabinet door is easy to collide with the cabinet body due to inertia and cause damage. In severe cases, the cabinet door will rebound and easily squeeze the workers' hands. Therefore, an automatic opening and closing door structure has emerged.

[0003] A Chinese patent application with application number CN201520362889.8 discloses an automatic advertising door for a residential pedestrian passage, comprising a door post and a door frame, wherein the door frame is rotatably connected to the door post by a hinge, a door lock is arranged between the other end of the door frame and another door post, the door lock is an electromagnetic lock, a door opener and a control host are arranged at the rear of the door frame, the arm of the door opener is connected to a slider slidably arranged at the lower end of the door frame, and the control signal end of the control host is respectively connected to the control signal receiving end of the door opener and the control signal input end of the electromagnetic lock.

[0004] The automatic door opening and closing structure controls the rotation of the machine arm through the door opener. The machine arm transmits power to the slider in the door frame slide slot, causing the slider to make reciprocating linear motion in the door frame, driving the door frame to rotate, thereby opening or closing the door frame, and locking the door frame by controlling the electromagnetic lock through the control host after the door is closed. However, in order to ensure the effect of automatic opening and closing, the automatic door opening and closing structure uses an electromagnetic lock as a locking tool. Once the power is off, the electromagnetic lock fails, the locking function of the door frame disappears, and the overall anti-theft performance is poor. Summary of the invention

[0005] The object of the present invention is to provide an electric door for a low-voltage switch cabinet, which ensures automatic opening and closing of the cabinet door while improving the anti-theft performance of the low-voltage cabinet.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an electric door of a low-voltage switch cabinet, comprising a cabinet body, a cabinet door hingedly arranged on the cabinet body and capable of opening or closing the cabinet body, an automatic door opening and closing structure arranged between the cabinet body and the cabinet door, and a locking structure arranged between the cabinet body and the cabinet door, the locking structure comprising a mounting block arranged on the cabinet body, a locking groove recessed on the top surface of the mounting block, a fixed block arranged on the cabinet door above the mounting block, a telescopic groove recessed on the bottom surface of the fixed block, and a locking block arranged for lifting and lowering in the telescopic groove, which is interlaced with the locking groove when descending or disengaged from the locking groove when ascending, and the lifting and lowering of the locking block is controlled by the opening or closing of the door by the automatic door opening and closing structure.

[0007] The above scheme is adopted, compared with the automatic door opening and closing structure in the prior art, in order to ensure the effect of automatic opening and closing, an electromagnetic lock is used as a locking tool. Once the power is off, the electromagnetic lock fails, the locking function of the door frame will disappear, and the overall anti-theft performance is poor. In this scheme, a locking structure is added, and the relative stillness between the fixed block and the mounting block is ensured by the descending of the locking block and the interlacing cooperation of the locking groove, thereby realizing the locking of the cabinet door. The locking block is controlled to rise and disengage from the locking groove, so that the cabinet door can be opened smoothly. In addition, the rise or fall of the locking block is controlled by the automatic door opening and closing structure, that is, the automatic door opening and closing structure controls the cabinet door to open while controlling the locking block to rise to achieve unlocking, and the automatic door opening and closing structure controls the cabinet door to close while controlling the locking block to descend to achieve locking. There is no need for manual unlocking or additional control. The degree of automation is high and the operation is simpler. At the same time, the locking failure caused by power failure is avoided, thereby ensuring the improvement of the anti-theft performance of the low-voltage cabinet.

[0008] Furthermore, the automatic door opening and closing structure includes a rotating arm that is arranged to reciprocate along the opening and closing direction of the cabinet door, a door opener that is fixed on the cabinet body above the door frame and drives the rotating arm to rotate, a slide rail that is fixed horizontally on the door frame, a slider that is slidable in the slide rail, a connecting block hinged on the slider, and a linkage structure that is arranged between the rotating arm and the connecting block and drives the connecting block to rotate together when the rotating arm rotates toward or away from the connecting block by a certain angle. A traction structure is arranged between the linkage structure and the locking block and controls the locking block to descend when the rotating arm rotates toward the connecting block or to rise when the rotating arm rotates away from the connecting block.

[0009] By adopting the above scheme, the door opener controls the swivel arm to rotate in the opening direction of the cabinet door, and the swivel arm rotates a certain angle away from the connecting block, and the locking block is driven to rise and disengage from the locking groove through the traction structure arranged between the linkage structure and the locking block to achieve unlocking, and the swivel arm continues to rotate, and the connecting block is driven to rotate together through the linkage structure, and since the connecting block and the slider are hingedly arranged, and the slider can move in the slide rail, the slider is driven to slide in the slide rail to control the opening of the cabinet door; when closing the cabinet door, the door opener controls the swivel arm to rotate in the closing direction of the cabinet door, and the swivel arm rotates a certain angle close to the connecting block, and the locking block is driven to descend through the traction structure arranged between the linkage structure and the locking block, and the swivel arm continues to rotate, and the connecting block is driven to rotate together through the linkage structure to control the closing of the cabinet door, and the locking block is interlaced with the locking groove through the traction structure to lock the cabinet door.

[0010] Furthermore, the linkage structure includes a transmission rod arranged on the rotating arm and passing through the connecting block, a limit block arranged on the end of the transmission rod away from the rotating arm, and a through groove arranged on the connecting block for the transmission rod to rotate around the center of rotation of the rotating arm. When the limit block rotates to abut against the connecting block, the locking block rises to disengage from the locking groove.

[0011] By adopting the above scheme, when opening the door, the rotating arm rotates to drive the transmission rod to rotate, and the limit block rotates accordingly until the limit block abuts against the connecting block. The rotating arm continues to rotate to drive the connecting block to rotate together with the rotating arm; when closing the door, the rotating arm rotates until the transmission rod abuts against the through groove. The rotating arm continues to rotate to drive the connecting block to rotate together with the rotating arm, and when the limit block rotates around the rotation center of the rotating arm, the traction structure can be controlled to drive the locking block to rise until it is disengaged from the locking groove.

[0012] Furthermore, the traction structure includes a traction rope whose two ends are respectively connected to the limit block and the locking block, and a first avoidance hole and a second avoidance hole respectively arranged on the fixed block and the cabinet door for the traction rope to pass through. The side of the locking block away from the limit block is arranged in an inclined surface that gradually inclines upward from close to the cabinet door to away from the cabinet door.

[0013] By adopting the above scheme, the limit block rotates around the rotation center of the rotating arm close to the connecting block, pulling the traction rope to move upward, thereby pulling the locking block up; the limit block rotates around the rotation center of the rotating arm away from the connecting block, the tension on the traction rope disappears, and the locking block descends under the action of its own gravity. In the process of closing the cabinet door, the locking block first rotates close to the connecting block through the rotating arm and descends a distance, and then gradually descends as the cabinet door closes, and finally ensures that the locking block and the locking groove are interlaced and matched, so at the moment when the cabinet door is about to close, there is bound to be a When the locking block has dropped to the point where it abuts the side wall of the mounting block, the cabinet door cannot be closed. Therefore, the side of the locking block away from the limit block is provided with an inclined surface which gradually tilts upward from close to the cabinet door to away from the cabinet door. When the locking block has dropped to the point where the inclined surface abuts the side wall of the mounting block, while the cabinet door continues to close, the locking block is driven to move upward and retract into the telescopic groove through the extrusion and sliding cooperation between the mounting block and the inclined surface until the cabinet door is closed and the telescopic groove and the locking groove are facing each other. The locking block falls under the action of its own gravity to intersect and cooperate with the locking groove.

[0014] Furthermore, the angle at which the rotating arm can rotate toward or away from the connecting block is 2 to 4 degrees.

[0015] When adopting the above scheme, if the angle is too small, the limit block will move too small, resulting in the connection block rotating with the rotating arm, and the locking block cannot be separated from the locking groove, thereby making it impossible to open the door. If the angle is too large, the rotating arm will rotate too much when the cabinet door is opened, which is not conducive to the opening or closing of the cabinet door.

[0016] Furthermore, a rolling structure is provided between the second avoidance hole and the traction rope to prevent the traction rope from breaking due to friction. The rolling structure includes an annular block arranged in the second avoidance hole, an annular groove recessed on the inner ring wall of the annular block, and an annular rolling ring rotatably arranged in the annular groove. The cross-section of the annular rolling ring is circular, and the inner diameter of the annular rolling ring is smaller than the inner diameter of the annular block. The rotation of the annular rolling ring is controlled by the friction between the annular rolling ring and the traction rope when the traction rope moves.

[0017] With the above scheme, since the traction rope will constantly rub against the second avoidance hole when moving upward or downward, the traction rope will be worn out after long-term use. Therefore, a rolling structure is provided. During the movement of the traction rope, friction is generated between the annular rolling circles. The friction force drives the annular rolling circles to roll, converting the sliding friction into rolling friction, thereby reducing the resistance and the wear on the traction rope. In addition, since the position where the friction is generated between the traction rope and the second avoidance hole is constantly changing during the opening or closing of the cabinet door, the annular rolling circle can be provided to ensure that the traction rope can roll with the annular rolling circle at any position.

[0018] Furthermore, an electromagnetic lock is arranged between the cabinet body and the cabinet door. The electromagnetic lock includes an electromagnet arranged on the cabinet body and an iron sheet arranged on the cabinet door. The locking and unlocking of the electromagnetic lock are controlled by the power on or off of the electromagnet.

[0019] By adopting the above scheme, the locking ability can be further increased by setting an electromagnetic lock. The electromagnet is energized to generate magnetic force, which can attract the iron sheet to lock. The electromagnet loses its electromagnetic force and cannot attract the iron sheet, so it can be unlocked.

[0020] Furthermore, a spring is arranged between the rotating arm and the connecting block.

[0021] By adopting the above solution, the linkage effect between the rotating arm and the connecting block can be further ensured by arranging a spring.

[0022] Furthermore, a receiving groove is concavely provided on the outer wall of the locking block, and a roller which is rotatably arranged in the receiving groove and fits with the inner wall of the telescopic groove.

[0023] By adopting the above solution, by providing a roller, the sliding friction between the locking block and the telescopic slot is converted into rolling friction, thereby reducing the friction between the locking block and the telescopic slot, and further ensuring the smooth lifting and lowering of the locking block.

[0024] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0025] 1. Add a locking structure. The automatic door opening and closing structure controls the door to open while controlling the locking block to rise to unlock. The automatic door opening and closing structure controls the door to close while controlling the locking block to descend to lock. Combined with the electromagnetic lock, the door opening and closing is more automated and easier to operate, while avoiding locking failure caused by power failure.

[0026] 2. The door opener controls the swivel arm to rotate in the direction of the cabinet door opening, the swivel arm rotates a certain angle away from the connecting block, the limit block approaches the connecting block, the traction rope rises, and the locking block is pulled up and disengaged from the locking groove to achieve unlocking. The swivel arm continues to rotate, and the connecting block is driven to rotate together through the linkage structure to control the opening of the cabinet door; when closing the cabinet door, the door opener controls the swivel arm to rotate in the direction of the cabinet door closing, the swivel arm rotates a certain angle close to the connecting block, the limit block moves away from the connecting block, the tension on the traction rope disappears, the locking block drops a certain distance under the action of its own gravity, the swivel arm continues to rotate, and the locking block continues to drop until the inclined surface and the mounting block abut against each other. During the process of the cabinet door continuing to close, the locking block is driven to move upward and retract into the telescopic groove through the extrusion and sliding cooperation between the mounting block and the inclined surface until the cabinet door is closed, the telescopic groove and the locking groove are facing each other, and the locking block falls under the action of its own gravity to intersect with the locking groove to achieve locking. Through the above two advantages, the automatic opening and closing of the cabinet door is ensured while improving the anti-theft performance of the low-voltage cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 This is an axonometric view of an electric door of a low-voltage switch cabinet in Example 1 when the cabinet door is closed;

[0029] Figure 2 yes Figure 1 A in the enlarged view;

[0030] Figure 3 This is a disassembled diagram of a low-voltage switch cabinet electric door in Example 1 when the cabinet door is closed;

[0031] Figure 4 yes Figure 3 The enlarged view of point B in the figure;

[0032] Figure 5 yes Figure 4 The enlarged view of D in the figure;

[0033] Figure 6 yes Figure 4 The enlarged view of point E in the figure;

[0034] Figure 7 yes Figure 3 The enlarged view of point C in the figure;

[0035] Figure 8 This is a front view of a low-voltage switch cabinet electric door in Example 1 when the cabinet door is closed;

[0036] Fig. 9 yes Figure 8 FF section view in;

[0037] Fig.10 yes Fig. 9 The enlarged view of G in the figure;

[0038] Fig.11 yes Fig.10 The enlarged view of H in the figure;

[0039] Fig.12 yes Fig.10 The enlarged view at position I in FIG.

[0040] Fig.13 It is a partial enlarged view of a low-voltage switch cabinet electric door in Example 1 when the cabinet door is unlocked;

[0041] Fig.14 This is a disassembled diagram of a low-voltage switch cabinet electric door in Example 1 when the cabinet door is unlocked;

[0042] Fig.15 yes Fig.14 The enlarged view of point J in the figure;

[0043] Fig.16 This is an axonometric view of an electric door of a low-voltage switch cabinet in Example 1 when the cabinet door is opened;

[0044] Fig.17 yes Fig.16 The enlarged view of K in the figure;

[0045] Fig.18 This is a disassembled diagram of a low-voltage switch cabinet electric door in Example 1 when the cabinet door is closed until the locking block abuts against the mounting block;

[0046] Fig.19 yes Fig.18 Enlarged view of L in the figure;

[0047] Fig. 20 yes Fig.18 The enlarged view of M in the figure;

[0048] Fig.21 This is an axonometric view of a locking block in an electric door of a low-voltage switch cabinet in Example 2.

[0049] In the figure: 1. cabinet body; 2. cabinet door; 3. mounting block; 4. locking groove; 5. fixing block; 6. telescopic groove; 7. locking block; 8. rotating arm; 9. door opener; 10. slide rail; 11. slider; 12. connecting block; 13. transmission rod; 14. limiting block; 15. through groove; 16. traction rope; 17. first avoidance hole; 18. second avoidance hole; 19. inclined plane; 20. annular block; 21. annular groove; 22. annular rolling ring; 23. electromagnet; 24. iron sheet; 25. spring; 26. accommodating groove; 27. roller. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0051] Example 1

[0052] A low voltage switch cabinet electric door, refer to Figures 1 to 20 , including a cabinet body 1, a cabinet door 2 is hingedly arranged on the cabinet body 1, and can be rotated to open or close the cabinet body 1, an automatic door opening and closing structure and a locking structure are arranged between the cabinet body 1 and the cabinet door 2, and the locking structure includes a mounting block 3 arranged on the cabinet body 1, a locking groove 4 is recessed on the top surface of the mounting block 3, a fixing block 5 is arranged on the cabinet door 2 above the mounting block 3, and a telescopic groove 6 is recessed on the bottom surface of the fixing block 5, and a locking block 7 is arranged in the telescopic groove 6 for lifting and lowering, and the locking block 7 is interlaced with the locking groove 4 when descending, so as to realize the cabinet Locking of the door 2; when the locking block 7 rises, it disengages from the locking groove 4 and is unlocked, and the cabinet door 2 can be opened smoothly. The lifting and lowering of the locking block 7 is controlled by the opening or closing of the door by the automatic opening and closing door structure, that is, the automatic opening and closing door structure controls the locking block 7 to rise when the cabinet door 2 is opened, and the automatic opening and closing door structure controls the locking block 7 to descend when the cabinet door 2 is closed. There is no need for manual unlocking or additional control. The degree of automation is high and the operation is simpler. It can also avoid locking failure caused by power failure, thereby improving the anti-theft performance of the low-voltage cabinet.

[0053] The automatic door opening and closing structure has a door opener 9 fixedly arranged above the door frame on the cabinet body 1, and a swivel arm 8 is arranged on the door opener 9. The door opener 9 controls the swivel arm 8 to reciprocate along the opening and closing direction of the cabinet door 2. A slide rail 10 is fixedly arranged horizontally on the door frame, and a slider 11 is slidably arranged in the slide rail 10. A connecting block 12 is hingedly arranged on the slider 11. A linkage structure is arranged between the swivel arm 8 and the connecting block 12. The linkage structure allows the swivel arm 8 to drive the connecting block 12 to rotate together after it approaches or moves away from the connecting block 12 by a certain angle. The door opener 9 controls the swivel arm 8 to rotate along the opening direction of the cabinet door 2. After the swivel arm 8 moves away from the connecting block 12 by a certain angle, it drives the connecting block 12 to rotate together. Since the connecting block 12 and the slider 11 are hingedly arranged, and the slider 11 can move in the slide rail 10, the slider 11 is driven to slide in the slide rail 10. , controlling the opening of the cabinet door 2; when closing the cabinet door 2, the door opener 9 controls the rotating arm 8 to rotate in the closing direction of the cabinet door 2. After the rotating arm 8 rotates a certain angle close to the connecting block 12, it drives the connecting block 12 to rotate together, controlling the closing of the cabinet door 2. The linkage structure includes a transmission rod 13 arranged on the rotating arm 8 and passing through the connecting block 12. A limit block 14 is arranged on the end of the transmission rod 13 away from the rotating arm 8. A through groove 15 is arranged on the connecting block 12 for the transmission rod 13 to rotate around the center of rotation of the rotating arm 8. When opening the door, the limit block 14 rotates with the rotating arm 8 until the limit block 14 abuts against the connecting block 12. Continuing to rotate the rotating arm 8 can drive the connecting block 12 to rotate together with the rotating arm 8; when closing the door, the rotating arm 8 rotates until the transmission rod 13 abuts against the through groove 15. Continuing to rotate the rotating arm 8 can drive the connecting block 12 to rotate together with the rotating arm 8.

[0054] A traction structure is provided between the linkage structure and the locking block 7. When the rotating arm 8 rotates close to the connecting block 12, the traction structure controls the locking block 7 to descend. When the rotating arm 8 rotates away from the connecting block 12, the traction structure controls the locking block 7 to rise. The traction structure includes a traction rope 16 connected to the limit block 14 and the locking block 7 at both ends respectively. A first avoidance hole 17 for the traction rope 16 to pass through is provided on the fixed block 5, and a second avoidance hole 18 for the traction rope 16 to pass through is provided on the cabinet door 2. The limit block 14 rotates close to the connecting block 12 around the rotation center of the rotating arm 8, and the traction rope 16 is pulled to make the locking block 7 rise. When the limit block 14 rotates to abut against the connecting block 12, the locking block 7 rises to disengage from the locking groove 4; the limit block 14 rotates away from the connecting block 12 around the rotation center of the rotating arm 8, the tension on the traction rope 16 disappears, and the locking block 7 is under the action of its own gravity. When the cabinet door 2 is closed, the locking block 7 is moved upward and retracted into the telescopic groove 6 through the extrusion and sliding cooperation between the mounting block 3 and the inclined surface 19, until the cabinet door 2 is closed and the telescopic groove 6 and the locking groove 4 are opposite, and the locking block 7 falls under the action of its own gravity to be interlaced with the locking groove 4.

[0055] The angle at which the swivel arm 8 can move closer to or away from the connecting block 12 is 2 to 4 degrees. If the angle is too small, the limit block 14 will move too small, resulting in the connection block 12 rotating with the swivel arm 8. The locking block 7 cannot be disengaged from the locking groove 4, and the door cannot be opened. If the angle is too large, the swivel arm 8 will rotate too much when the cabinet door 2 is opened, which is not conducive to the opening or closing of the cabinet door 2. In this embodiment, the rotatable angle is set to 3 degrees.

[0056] Since the traction rope 16 will constantly rub against the second avoidance hole 18 during movement, the traction rope 16 will be worn out after long-term use, so a rolling structure is provided, which includes an annular block 20 arranged in the second avoidance hole 18, and an annular groove 21 is recessed on the inner ring wall of the annular block 20. An annular rolling ring 22 is rotatably arranged in the annular groove 21. The cross-section of the annular rolling ring 22 is circular, and the inner diameter of the annular rolling ring 22 is smaller than the inner diameter of the annular block 20. During the movement of the traction rope 16, friction is generated by abutment between the annular rolling rings 22. The friction force drives the annular rolling rings 22 to roll, converting the sliding friction into rolling friction, thereby reducing the resistance and reducing the wear on the traction rope 16. In this embodiment, the traction rope 16 adopts a steel wire rope to further extend the service life.

[0057] An electromagnetic lock is also provided between the cabinet body 1 and the cabinet door 2, which can further increase the locking ability when powered on. The electromagnetic lock includes an electromagnet 23 provided on the cabinet body 1 and an iron sheet 24 provided on the cabinet door 2. The electromagnet 23 generates magnetic force when energized, and can lock the cabinet door by attracting the iron sheet 24. When the electromagnet 23 loses its electromagnetic force, it cannot attract the iron sheet 24 and can be unlocked. The door opener 9 and the electromagnet 23 are both controlled by a control system, which is a prior art and will not be described in detail here.

[0058] Example 2

[0059] The difference between this embodiment and embodiment 1 is that in this embodiment, reference Fig.21 A receiving groove 26 is recessed on the outer wall of the locking block 7, and a roller 27 is rotatably arranged in the receiving groove 26 and is in contact with the inner wall of the telescopic groove 6. By setting the roller 27, the sliding friction between the locking block 7 and the telescopic groove 6 is converted into rolling friction, thereby reducing the friction force between the locking block 7 and the telescopic groove 6, and further ensuring the smooth lifting and lowering of the locking block 7.

[0060] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electric door for a low-voltage switch cabinet, comprising a cabinet body (1), a cabinet door (2) hingedly arranged on the cabinet body (1) and capable of opening or closing the cabinet body (1), an automatic door opening and closing structure arranged between the cabinet body (1) and the cabinet door (2), and a locking structure arranged between the cabinet body (1) and the cabinet door (2), characterized in that: An electromagnetic lock is arranged between the cabinet body (1) and the cabinet door (2), the electromagnetic lock comprising an electromagnet (23) arranged on the cabinet body (1) and an iron sheet (24) arranged on the cabinet door (2), the locking and unlocking of the electromagnetic lock being controlled by the power on or off of the electromagnet (23); the locking structure comprising a mounting block (3) arranged on the cabinet body (1), a locking groove (4) recessed on the top surface of the mounting block (3), a fixing block (5) arranged on the cabinet door (2) above the mounting block (3), a telescopic groove (6) recessed on the bottom surface of the fixing block (5), and a lowering and lowering member arranged in the telescopic groove (6) and engaging with the locking groove (4) when lowered. A locking block (7) is interlaced or disengaged from the locking groove (4) when it is inserted into or raised, and the lifting and lowering of the locking block (7) is controlled by the opening or closing of the automatic door opening and closing structure; the automatic door opening and closing structure comprises a rotating arm (8) arranged to rotate reciprocatingly along the opening and closing direction of the cabinet door (2), a door opening machine (9) fixedly arranged above the door frame on the cabinet body (1) and driving the rotating arm (8) to rotate, a slide rail (10) fixedly arranged horizontally on the door frame, a slider (11) slidably arranged in the slide rail (10), a connecting block (12) hingedly arranged on the slider (11), and a rotating arm (8) arranged between the rotating arm (8) and the connecting block (12). The invention relates to a linkage structure for driving the connecting block (12) to rotate together with the connecting block (12) after the rotating arm (8) rotates toward or away from the connecting block (12) by a certain angle, and a traction structure for controlling the locking block (7) to descend when the rotating arm (8) rotates toward the connecting block (12) or to ascend when the rotating arm (8) rotates away from the connecting block (12) is provided between the linkage structure and the locking block (7); the linkage structure comprises a transmission rod (13) provided on the rotating arm (8) and passing through the connecting block (12), a limit block (14) provided on one end of the transmission rod (13) away from the rotating arm (8), and a traction structure for controlling the locking block (7) to descend when the rotating arm (8) rotates toward the connecting block (12) or to ascend when the rotating arm (8) rotates away from the connecting block (12); and 13) a through groove (15) around the rotation center of the rotating arm (8), when the limit block (14) rotates to abut against the connecting block (12), the locking block (7) rises to be separated from the locking groove (4); the traction structure comprises a traction rope (16) whose two ends are respectively connected to the limit block (14) and the locking block (7), and a first avoidance hole (17) and a second avoidance hole (18) are respectively arranged on the fixing block (5) and the cabinet door (2) for the traction rope (16) to pass through, and a side of the locking block (7) away from the limit block (14) is provided with an inclined surface (19) which is gradually inclined upward from close to the cabinet door (2) to away from the cabinet door (2).

2. The low-voltage switch cabinet electric door according to claim 1, characterized in that: The angle at which the rotating arm (8) can be moved closer to or farther from the connecting block (12) is 2 to 4 degrees.

3. The low-voltage switch cabinet electric door according to claim 1, characterized in that: A rolling structure for preventing the traction rope (16) from breaking due to friction is arranged between the second avoidance hole (18) and the traction rope (16). The rolling structure comprises an annular block (20) arranged in the second avoidance hole (18), an annular groove (21) recessed on the inner ring wall of the annular block (20), and an annular rolling ring (22) rotatably arranged in the annular groove (21). The cross section of the annular rolling ring (22) is circular, and the inner diameter of the annular rolling ring (22) is smaller than the inner diameter of the annular block (20). The rotation of the annular rolling ring (22) is controlled by the friction between the annular rolling ring (22) and the traction rope (16) when the traction rope (16) moves.

4. The low-voltage switch cabinet electric door according to claim 1, characterized in that: A spring (25) is arranged between the rotating arm (8) and the connecting block (12).

5. The low-voltage switch cabinet electric door according to claim 1, characterized in that: An accommodating groove (26) is concavely arranged on the outer wall of the locking block (7), and a roller (27) that is rotatably arranged in the accommodating groove (26) and is in contact with the inner wall of the telescopic groove (6).

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