A lower door interlocking device for a high voltage cabinet

Abstract

The present invention relates to a lower door interlocking device of a high-voltage cabinet, which includes a knob, a bracket and a limit rod. The bracket can be fixed to the high-voltage cabinet, the limit rod is arranged on the bracket and can move relative to the bracket, and the knob is rotatably connected to the bracket; the limit rod is provided with a connecting structure, and the knob is also provided with an action piece. When the knob rotates around its axis, it can drive the action piece to rotate, and the action piece can act on the connecting structure when rotating, so as to drive the limit rod to move upward to its top end to cooperate with the grounding shaft sleeve or drive the limit rod to move downward to its bottom end to cooperate with the lower door and lock. This device has a compact structure, small size, convenient installation, and wide applicability, and is particularly suitable for use in narrow spaces; it meets the operating habits of the power industry, warns operators from a visual aspect, uses a fool-proof design from a behavioral aspect, prevents misoperation of the equipment, and has high safety; the parts are mostly made of metal stamping technology, with good precision, high efficiency, good product consistency, low production cost, and high reliability.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage switchgear, and in particular to a lower door interlocking device of a high-voltage cabinet. Background Art

[0002] The lower door interlocking device of the existing high-voltage cabinet is mostly designed with a wire and a slider. The rotation of the knob can be transmitted through the wire and the slider to act on the limit rod, so that it can lock and unlock the lower door. However, the connection between the wire and the slider has strict requirements on the assembly process, and due to the large number of transmission times, long transmission path, and many parts involved, there are problems such as poor reliability, cumbersome installation, low efficiency, and poor product consistency.

[0003] How to simplify the specific structure of the interlocking mechanism of the lower door of the high-voltage cabinet to facilitate installation and ensure reliability is a technical problem that needs to be solved by those skilled in the art. Summary of the invention

[0004] The purpose of the present invention is to provide a lower door interlocking device for a high-voltage cabinet, which can simplify the specific structure of the lower door interlocking mechanism of the high-voltage cabinet, facilitate installation and ensure reliability.

[0005] In order to solve the above technical problems, the present invention provides a lower door interlocking device of a high-voltage cabinet, which includes a knob, a bracket and a limit rod, the bracket can be fixed to the high-voltage cabinet, the limit rod is arranged on the bracket and can move relative to the bracket, and the knob is rotatably connected to the bracket; the limit rod is provided with a connecting structure, and the knob is also provided with an actuating member, when the knob rotates around its axis, it can drive the actuating member to rotate, and the actuating member can act on the connecting structure when rotating, so as to drive the limit rod to move upward to its top end to cooperate with the grounding shaft sleeve or drive the limit rod to move downward to its bottom end to cooperate with the lower door and lock.

[0006] It is not difficult to understand that the actuating member and the knob are not coaxially arranged. When the knob is rotated, the actuating member also rotates, but the actuating member rotates around the axis of the knob within a certain height range. By connecting with the connecting structure, the rotational displacement can be converted into a linear movement of the limit rod in the height direction (up and down direction).

[0007] In detail, when it is in the grounding closing position, the lower door can be opened, and the knob is turned so that it acts on the connection structure through the action piece and drives the limit rod to move upward to its top end and move into the grounding shaft sleeve, and the bottom end of the limit rod is separated from the lower door. At this time, the handle cannot be inserted into the grounding shaft sleeve for operation, and the locking effect of the limit rod on the lower door is released, and the lower door can be opened. When grounding, the lower door should be closed, and the knob is turned in the opposite direction so that the knob acts on the connection structure through the action piece and drives the limit rod to move downward to its bottom end and lock with the lower door, and the top end of the limit rod is separated from the grounding shaft sleeve. At this time, the lower door is in a locked state and cannot be opened, and the handle can be inserted into the grounding shaft sleeve to perform the grounding opening operation. When the grounding opening operation is completed, the grounding shaft sleeve rotates, and the top end of the limit rod cannot enter the grounding shaft sleeve. That is to say, after the grounding opening operation is completed, the top end of the limit rod is limited in movement, so that it cannot move upward, and the lower door remains locked and cannot be opened, ensuring safety.

[0008] The limit rod is arranged on the bracket and can be moved in the vertical direction by the rotation of the knob. That is to say, the bracket can guide the movement of the limit rod, the knob provides the moving power, and the actuating member arranged on the knob can directly transmit the power to the knob by connecting with the connecting structure. The overall structure of the interlocking mechanism of the lower door of the high-voltage cabinet is simple and easy to install and operate. At the same time, due to the short power transmission path, the reliability is good and the efficiency is high.

[0009] Optionally, the bracket is also provided with a first limit point and a second limit point, the actuating member can rotate between the first limit point and the second limit point, and the height of the second limit point is higher than the height of the first limit point; when the actuating member moves from the first limit point to the second limit point, it can pass directly above the rotation axis of the knob, and when the actuating member rotates to the second limit point, the top end of the limit rod can be located in the grounding shaft sleeve, and when the actuating member rotates to the first limit point, the bottom end of the limit rod can cooperate with the lower door to lock.

[0010] Optionally, a compression spring is further included, which is sleeved outside the limiting rod and arranged between the bracket and the connecting structure. When the actuating member rotates to any limiting point, the compression spring is in a tensioned or compressed state and can act downward on the connecting structure.

[0011] Optionally, the connecting structure includes a first side plate, a connecting plate and a second side plate connected in sequence, the first side plate is fixed to the limiting rod by bolts, the second side plate is provided with a strip hole, the strip hole is arranged in a horizontal direction, and the actuating member can pass through the strip hole.

[0012] Optionally, it also includes a baffle, and the bracket also includes a guide slide arranged in a vertical direction, the baffle is provided with a slider capable of sliding along the guide slide, the actuating member can act on the baffle to drive the slider to slide along the guide slide, and when the actuating member rotates until the top end of the limit rod is located in the grounding shaft sleeve, the baffle can block the outside of the grounding shaft sleeve.

[0013] Optionally, an eccentric shaft is provided on one end face of the knob facing the bracket, and the eccentric shaft forms the actuating member; an insertion hole is provided on the end face of the knob, and the eccentric shaft portion can be inserted into the insertion hole and fixed by bolts.

[0014] Optionally, the bracket is also fixed with a guide shaft, the outer wall of the guide shaft is provided with a sliding groove along the circumferential direction, the knob is sleeved outside the guide shaft and can rotate around the axis of the guide shaft, the knob is provided with a sliding screw, the sliding screw is located in the sliding groove and can slide along the sliding groove.

[0015] Optionally, an end surface of the knob away from the bracket is further provided with an indication structure, and the indication structure is located on an axial extension line of the actuating member.

[0016] Optionally, a protective plate is further included, which is sleeved outside the knob, and an elastic member is also provided between the protective plate and the bracket, and the elastic member can act on the protective plate to move it to a side away from the bracket.

[0017] Optionally, the bracket includes a mounting plate and a mounting frame, the mounting plate is used to be fixed to the mechanism, and the knob is rotatably connected to the mounting plate; the mounting frame is a U-shaped structure, and the open end of the U-shaped structure is fixed to the mounting plate; the limit rod is parallel to the mounting plate and the two ends of the limit rod respectively pass through the two side walls of the U-shaped structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a lower door interlocking device of a high-voltage cabinet provided in an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A cross-sectional view of

[0020] Figure 3 It is a schematic diagram of the structure of the mounting plate;

[0021] Figure 4 It is a schematic diagram of the structure of the lower door interlock device in the installed state.

[0022] Attached Figure 1-4 In the figure, the reference numerals are described as follows:

[0023] 1-knob, 11-actuating member, 12-indicating structure, 13-sliding screw;

[0024] 2-bracket, 21-first limiting point, 22-second limiting point, 23-guide slide, 24-mounting plate, 241-mounting hole, 25-mounting frame, 26-arc slide, 27-guide shaft, 271-sliding groove;

[0025] 3-Limiting rod;

[0026] 4-Connection structure;

[0027] 5-Compression spring;

[0028] 6- baffle, 61- slider;

[0029] 7- Protective plate;

[0030] 8- elastic member;

[0031] 9-ground shaft sleeve;

[0032] 10-lower door, 101-locking structure, 102-elastic pressing piece. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] The embodiment of the present invention provides a lower door interlocking device of a high-voltage cabinet, such as Figure 1 As shown, the lower door interlocking device of the high-voltage cabinet includes a knob 1, a bracket 2 and a limit rod 3, wherein the bracket 2 can be fixed to the high-voltage cabinet and is used to install the lower door interlocking device on the high-voltage cabinet, the limit rod 3 is arranged on the bracket 2 and can move in a vertical direction relative to the bracket 2, and the knob 1 is rotatably connected to the bracket 2.

[0035] Specifically, the limit rod 3 is provided with a connecting structure 4, and the knob 1 is provided with an actuating piece 11. When the knob 1 rotates around its axis, it can drive the actuating piece 11 to rotate. At the same time, the actuating piece 11 can act on the connecting structure 4 and drive the limit rod 3 to move upward or downward. The knob 1 can drive the limit rod 3 to move upward by rotating until the top end of the limit rod 3 cooperates with the grounding shaft sleeve 9, and the bottom end of the limit rod 3 is disengaged from the lower door 10. At this time, the lower door 10 can be opened and the handle cannot be inserted into the grounding shaft sleeve 9; the knob 1 can also drive the limit rod 3 to move downward by reverse rotation to the bottom end of the limit rod 3 to cooperate and lock with the lower door 10, and the top end of the limit rod 3 is disengaged from the grounding shaft sleeve 9. At this time, the lower door 10 cannot be opened, and the handle can be inserted into the grounding shaft sleeve 9 for operation.

[0036] It is not difficult to understand that the action member 11 and the knob 1 are not coaxially arranged. When the knob 1 rotates, the action member 11 also rotates, but the action member 11 rotates around the axis of the knob 1 within a certain height range. By connecting with the connecting structure 4, the rotational displacement can be converted into a linear movement of the limit rod 3 in the height direction (up and down direction).

[0037] In detail, when in the grounding closing position, the lower door 10 can be opened, and the knob 1 is turned to act on the connecting structure 4 through the actuating member 11 and drive the limit rod 3 to move upward until its top end moves into the grounding shaft sleeve 9, and the bottom end of the limit rod 3 is disengaged from the lower door 10. At this time, the handle cannot be inserted into the grounding shaft sleeve 9 for operation, and the locking effect of the limit rod 3 on the lower door 10 is released, and the lower door 10 can be opened. When grounding, the lower door 10 should be closed and the knob 1 should be rotated in the opposite direction so that the knob 1 acts on the connecting structure 4 through the actuating member 11 and drives the limit rod 3 to move downward to its bottom end and lock with the lower door 10, and the top end of the limit rod 3 is disengaged from the grounding shaft sleeve 9. At this time, the lower door 10 is in a locked state and cannot be opened, and the handle can be inserted into the grounding shaft sleeve 9 to perform the grounding and opening operation. When the grounding and opening operation is completed, the grounding shaft sleeve 9 rotates, and the top end of the limit rod 3 cannot enter the grounding shaft sleeve 9. In other words, after the grounding and opening operation is completed, the movement of the top end of the limit rod 3 is restricted, so that it cannot move upward, and the lower door 10 remains locked and cannot be opened, thereby ensuring safety.

[0038] The limit rod 3 is arranged on the bracket 2 and can be driven to move in the vertical direction by the rotation of the knob 1. That is to say, the bracket 2 can guide the movement of the limit rod 3, the knob 1 provides the moving power, and the actuating member 11 arranged on the knob 1 can directly transmit the power to the knob 1 by connecting with the connecting structure 4. The overall interlocking mechanism of the lower door 10 of the high-voltage cabinet is simple and easy to install and operate. At the same time, due to the short power transmission path, the reliability is good and the efficiency is high.

[0039] In the above embodiment, the bracket 2 is provided with a first limit point 21 and a second limit point 22. When the knob 1 is rotated, it can drive the actuating member 11 to rotate between the first limit point 21 and the second limit point 22. The height of the second limit point 22 is higher than the height of the first limit point 21. Moreover, when the actuating member 11 is rotated to the first limit point 21, the bottom end of the limit rod 3 can be locked with the lower door 10, and the top end of the limit rod 3 can be disengaged from the grounding shaft sleeve 9. When the actuating member 11 is rotated from the first limit point 21 to the second limit point 22, the actuating member 11 can pass directly above the rotation axis of the knob 1 (the highest point), and when the actuating member 11 is rotated to the second limit point 22, the top end of the limit rod 3 can be located in the grounding shaft sleeve 9, and the bottom end is disengaged from the lower door 10.

[0040] It can be understood that the setting of the two limit points can limit the rotation of the action member 11 and even the rotation of the knob 1. When the action member 11 is rotating, the first limit point 21 is the lowest point of its moving path, but the second limit point 22 is not the highest point. Since the action member 11 has passed the highest point when it rotates to the second limit point 22, the action member 11 needs to pass the highest point first when it rotates from one limit point to another, that is, rotate upward and then rotate downward. In this way, the action member 11 can stay stably at the second limit point 22 to ensure a stable state.

[0041] Furthermore, the interlocking mechanism of the lower door 10 of the high-voltage cabinet further includes a compression spring 5, which is arranged between the bracket 2 and the connecting structure 4. When the actuating member 11 rotates to any limit point, the compression spring 5 is in a tension or compression state, and the restoring force of the compression spring 5 can act on the connecting structure 4 to make it tend to move downward. Figure 2 As shown, when the top end of the compression spring 5 abuts against the bracket 2 and the bottom end of the compression spring 5 abuts against the connecting structure 4, the compression spring 5 is in a compressed state, and the restoring force of the compression spring 5 in the compressed state can act on the connecting structure 4 to make it have a tendency to move downward; when the bottom end of the compression spring 5 abuts against the bracket 2 and the top end of the compression spring 5 abuts against the connecting structure 4, the compression spring 5 is in a stretched state, and the restoring force of the compression spring 5 in the stretched state can act on the connecting structure 4 to make it have a tendency to move downward. Regardless of whether the action member 11 is located at the first limit point 21 or the second limit point 22, the compression spring 5 can apply a downward force to the action member 11 through the connecting structure 4, and this force will enable the action member 11 to be stably located in the first limit point 21 or the second limit point 22.

[0042] Furthermore, even if the external force is withdrawn when the actuating member 11 is rotated to a position close to the limit point, the restoring force of the compression spring 5 can act on the connecting structure 4 and drive the actuating member 11 to rotate to the first limit point 21 or the second limit point 22. That is to say, the compression spring 5 can make the actuating member 11 rotate to one of the limit points, so that the stop position of the limit rod 3 is only at the first limit point 21 and the second limit point 22. In this way, while ensuring stability, it can also avoid the situation where the operator performs subsequent grounding and opening operations without locking the lower door 10 due to the rotation knob 1 not being in place, thereby ensuring safety.

[0043] In the above embodiment, the connection structure 4 includes a first side plate, a connection plate, and a second side plate connected in sequence, wherein the first side plate, the connection plate, and the second side plate can be enclosed to form a U-shaped structure, and the first side plate is fixed to the limiting rod 3 by bolts, and the second side plate is provided with a strip hole, the length direction of which is arranged in the horizontal direction, and the action member 11 can pass through the strip hole, and when the action member 11 rotates, it can slide in the strip hole along the length direction of the strip hole, and at the same time act on the side wall of the strip hole and drive the connection structure 4 to move up and down, thereby driving the limiting rod 3 to move up and down. Of course, in this embodiment, there is no limitation on the specific shape and structure of the connection structure 4, as long as it can be fixed to the limiting rod 3 and can drive the limiting rod 3 to move up and down under the action of the action member 11. For example, the limiting structure can be set as a protrusion protruding outward along the outer wall of the limiting rod 3, and the protrusion is provided with a bend, and the bend can be connected to the action member 11 by setting a strip hole or setting a chain, and when the connection structure 4 and the limiting rod 3 are detachably connected by bolts, the manufacturing process can be simplified and the installation operation between the limiting rod 3 and the bracket 2 can be facilitated. In addition, the action member 11 cooperates with the strip hole to achieve action, which can ensure stable and reliable transmission compared to the action achieved by chain connection.

[0044] In the above embodiment, if Figure 1 and Figure 2 As shown, the lower door interlocking device also includes a baffle 6, and the bracket 2 also includes a guide slide 23 arranged in the vertical direction. The baffle 6 is provided with a slider 61 that can slide along the guide slide 23. The actuating member 11 can drive the bottom end of the baffle 6 to move when rotating, and the slider 61 arranged on the baffle 6 can slide up and down along the guide slide 23. When the actuating member 11 drives the limit rod 3 to move upward until the top end of the limit rod 3 is located in the grounding shaft sleeve 9, the baffle 6 can be blocked outside the grounding shaft sleeve 9, and can be moved from The outer side blocks the grounding shaft sleeve 9 to achieve double insurance, avoid the insertion of the handle, and facilitate the operator to intuitively see that under the action of the actuating member 11, the slider 61 and the limit rod 3 move up and down synchronously. When the actuating member 11 rotates in the opposite direction and drives the limit rod 3 to move downward, the baffle 6 also moves downward with the rotation of the actuating member 11. When the top end of the limit rod 3 is separated from the grounding shaft sleeve 9, the baffle 6 no longer blocks the grounding shaft sleeve 9, and the handle can be inserted into the grounding shaft sleeve 9 for operation.

[0045] Furthermore, the baffle 6 can slide around the slider 61 relative to the bracket 2, and the actuating member 11 is hinged to the bottom end of the baffle 6. When the actuating member 11 rotates, it can drive the bottom end of the baffle 6 to move along the rotation path of the actuating member 11. Since the rotation path is non-linear, but the slider 61 moves linearly along the guide slide 23, the baffle 6 will rotate around the slider 61 and the hinge point between the actuating member 11 during the up and down movement. Specifically, at least one of the slider 61 and the guide slide 23, and the slider and the baffle 6 is rotatably connected. If the guide slide 23 is a hole structure, and the baffle 6 is also provided with a hole structure, the slider 61 passes through the hole structure of the baffle 6 and the guide slide 23 and can rotate relative to the two.

[0046] Alternatively, the baffle 6 may not rotate, and the actuating member 11 is connected to the bottom end of the baffle 6 by a hinge, and the actuating member 11 drives the baffle 6 to move in the vertical direction through the change of the hinge during the rotation process. When the actuating member 11 is directly hinged to the bottom end of the baffle 6, the connection stability and dimensional accuracy can be ensured, and the overall structure can be simplified.

[0047] Of course, in this embodiment, the bracket 2 may be provided with a slider 61 and the baffle 6 may be provided with a guide slide 23, and no specific limitation is made here.

[0048] In the above embodiment, if Figure 2 As shown, the end face of the knob 1 facing the bracket 2 is provided with an eccentric shaft, and the eccentric shaft forms the above-mentioned action piece 11, or the action piece 11 can also be set as a protruding structure protruding from the outer wall of the knob 1, and when the action piece 11 is set as an eccentric shaft, the overall structure can be simplified. Further, the end face of the knob 1 is provided with an insertion hole, and part of the eccentric shaft can be inserted into the insertion hole and can be fixed by bolts, or the eccentric shaft can be set as an integrated structure with the knob 1, and when the eccentric shaft is set as a split structure with the knob 1 and a detachable connection is achieved by bolts, the overall structure can be made more flexible, which is convenient for the installation operation of the knob 1. For example, during installation, the eccentric shaft can be first connected to the bracket 2 and the connecting structure 4, and then the knob 1 can be connected to the eccentric shaft, which simplifies the installation operation.

[0049] In the above embodiment, the bracket 2 is also fixed with a guide shaft 27, and the outer wall of the guide shaft 27 is provided with a sliding groove 271 along its circumference. The knob 1 is sleeved outside the guide shaft 2 and can rotate relative to the guide shaft 2, and the knob 1 is also provided with a sliding screw 13, which is located in the sliding groove 271. When the knob 1 rotates relative to the guide shaft 2, the sliding screw 13 can slide along the sliding groove 271. Among them, the guide shaft 27 can provide guidance for the rotation of the knob 1. The knob 1 is equivalent to a sleeve sleeved outside the guide shaft 27, and the side wall of the sleeve is also provided with a sliding screw 13 inserted. The sliding screw 13 slides along the sliding groove 271, which can ensure the sliding stability and prevent the knob 1 from being separated from the guide shaft 2. Of course, in this embodiment, the guide shaft 27 and the knob can also be an integrated structure, and the bracket can be provided with a sleeve sleeved outside the guide shaft 27 and slide through the sliding screw 13, and no specific restrictions are made here. When the guide shaft 27 is fixed to the bracket, and the knob 1 is sleeved outside the guide shaft 27 and slides through the sliding screw 271, the overall structure and installation operation can be simplified.

[0050] An indication structure 14 is also provided on the end face of the knob 1 away from the bracket 2. The indication structure 14 is located on the axial extension line of the actuating member 11. After the knob 1 is rotated, the position of the actuating member 11 can be intuitively known through the indication structure 14, thereby knowing the state of the lower door interlocking device of the high-voltage cabinet. Specifically, in the present embodiment, there is no limitation on the indication structure 14, such as it can be set as a pit, a protrusion or a fixing member provided on the end face of the knob 1. Furthermore, after the interlocking mechanism is installed, the interlocking mechanism is on the rear side of the cabinet front panel, and only the knob 1 part passes through the cabinet front panel and is located on the front side of the cabinet front panel, which is convenient for rotation operation. In order to quickly know the state of the interlocking mechanism, the front side wall of the cabinet front panel can be provided with a knob 1 position mark, such as Figure 4 As shown, it is used to indicate that when the indicating structure 14 is in a certain position, the lower door 10 is in an open state, and when the indicating structure 14 is in a certain position, the lower door 10 is in a closed state. At the same time, a direction arrow can be set around the knob 1 to indicate which direction is the door opening direction and which direction is the door locking direction, so as to facilitate operation.

[0051] In the above embodiment, if Figure 1 and Figure 2As shown, the lower door interlocking device of the high-voltage cabinet also includes a protective plate 7, which is provided with a protective hole, and the knob 1 passes through the protective hole, that is, the protective plate 7 is sleeved outside the knob 1, and an elastic member 8 is also provided between the protective plate 7 and the bracket 2, and the elastic member 8 can act on the protective plate 7 to move it to the side away from the bracket 2. When installing the lower door interlocking device, it is only necessary to fix the bracket 2 to the mechanism through fasteners, so that the interlocking mechanism is located on the rear side of the cabinet front panel. Under the elastic action of the elastic member 8, the protective plate 7 can make its front side face the rear side wall of the cabinet front panel, ensuring the stability of the installation position, and can complete the installation without multiple debugging, and can also provide protection for the knob 1. The installation operation is relatively simple and the installation efficiency is high. Specifically, the elastic member 8 can be a spring or an elastic rubber member, etc., and no specific restrictions are made here.

[0052] In the above embodiment, the bracket 2 includes a mounting plate 24 and a mounting frame 25, wherein the mounting plate 24 is provided with a mounting hole 241 for fixing with a high-voltage cabinet by bolts, and the knob 1 can be rotatably connected with the mounting plate 24, and the mounting frame 25 is a U-shaped structure, the open end of the U-shaped structure is fixed with the mounting plate 24, and in the use state, the two side walls of the U-shaped structure are stacked up and down, and the two ends of the limit rod 3 can respectively pass through the two side walls of the U-shaped structure of the mounting frame 25, and there are two sliding connection points between the two side walls and the limit rod 3, and the limit rod 3 can slide in the vertical direction relative to the mounting frame 25, and the two connection points can limit and guide the limit rod 3 to ensure that it moves in the vertical direction. When a compression spring 5 is provided, the compression spring 5 is arranged between a side wall of the U-shaped structure and the connecting structure 4.

[0053] In addition, if Figure 3 As shown, the mounting plate 24 may also be provided with an arcuate slideway 26 , the two end points of which are the first limit point 21 and the second limit point 22 , respectively. When the knob 1 is rotated, the actuating member 11 can be driven to slide along the arcuate slideway 26 .

[0054] In the above embodiment, the mechanism is further provided with an elastic pressing piece 102 at the door frame of the lower door 10, and a locking structure 101 such as a lock hole or a lock slot is provided at the top of the lower door 10. When the lower door 10 is closed and matched with the door frame, the elastic pressing piece 102 can be pressed into the door frame, and the limit rod 3 moves downward to its bottom end to match with the locking structure 101, and the lower door 10 is locked. When the lower door 10 does not reach the state of matching with the door frame, the elastic pressing piece 102 protrudes out of the door frame. At this time, if the limit rod 3 moves downward, its bottom end will abut against the upper end surface of the elastic pressing piece 102, thereby limiting the downward movement of the limit rod 3, so that the top end of the limit rod 3 is still located in the grounding shaft sleeve 9, and the handle cannot be operated. Such a setting can avoid the situation where the grounding and disconnecting operation is performed when the lower door 10 is opened or the lower door 10 is half-closed, thereby ensuring safety. Specifically, there is no limitation on the specific structure of the elastic pressure piece 102. For example, a mounting groove can be set on a side wall of the door frame facing the lower door 10. The elastic pressure piece 102 includes a spring and a pressure block. The spring is located in the mounting groove, and the pressure block is partially located in the mounting groove. When the lower door 10 is opened, the pressure block will extend out of the mounting groove under the action of the spring to limit the limit rod 3. When the lower door 10 is closed, the pressure block can be pushed to compress the spring and enter the mounting groove.

[0055] The lower door interlock device of the high-voltage cabinet provided in this embodiment has a compact structure, a small size, is simple and convenient to install, and has a wide range of applicability, especially suitable for use in narrow spaces; the operation meets the operating habits of the power industry, uses the human-computer interaction design concept, warns the operator visually, and uses a fool-proof design from a behavioral perspective to prevent misoperation of the equipment, with high safety; at the same time, most parts are made of metal stamping technology, with good production precision, high efficiency, and good product consistency. Standard parts are mostly used for fastening during assembly, with low production costs and high reliability.

[0056] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A lower door interlocking device for a high-voltage cabinet, characterized in that: It comprises a knob (1), a bracket (2) and a limiting rod (3), wherein the bracket (2) can be fixed to a high-voltage cabinet, the limiting rod (3) is arranged on the bracket (2) and can move relative to the bracket (2), and the knob (1) is rotatably connected to the bracket (2); The limiting rod (3) is provided with a connecting structure (4), and the knob (1) is also provided with an actuating member (11). When the knob (1) rotates around its axis, it can drive the actuating member (11) to rotate, and when the actuating member (11) rotates, it can act on the connecting structure (4) to drive the limiting rod (3) to move upward to its top end to cooperate with the grounding shaft sleeve (9) or to drive the limiting rod (3) to move downward to its bottom end to cooperate with the lower door (10) to lock; The bracket (2) is further provided with a first limiting point (21) and a second limiting point (22), the actuating member (11) is capable of rotating between the first limiting point (21) and the second limiting point (22), and the height of the second limiting point (22) is higher than the height of the first limiting point (21); When the actuating member (11) moves from the first limit point (21) to the second limit point (22), it can pass directly above the rotation axis of the knob (1), and when the actuating member (11) rotates to the second limit point (22), the top end of the limit rod (3) can be located in the grounding shaft sleeve (9), and when the actuating member (11) rotates to the first limit point (21), the bottom end of the limit rod (3) can cooperate and lock with the lower door (10).

2. The lower door interlocking device of the high-voltage cabinet according to claim 1 is characterized in that: It also includes a compression spring (5), which is sleeved outside the limiting rod (3) and arranged between the bracket (2) and the connecting structure (4). When the actuating member (11) rotates to any limiting point, the compression spring (5) is in a tensioned or compressed state and can act downward on the connecting structure (4).

3. The lower door interlocking device of the high-voltage cabinet according to claim 2 is characterized in that: The connection structure (4) comprises a first side plate, a connection plate and a second side plate which are connected in sequence, the first side plate is fixed to the limit rod (3) by bolts, the second side plate is provided with a strip hole, the strip hole is arranged in a horizontal direction, and the action member (11) can pass through the strip hole.

4. The lower door interlocking device of the high-voltage cabinet according to any one of claims 1 to 3, characterized in that: The bracket (2) further comprises a baffle (6), and the bracket (2) further comprises a guide slideway (23) arranged in a vertical direction. The baffle (6) is provided with a slider (61) capable of sliding along the guide slideway (23). The actuating member (11) can act on the baffle (6) to drive the slider (61) to slide along the guide slideway (23), and when the actuating member (11) rotates until the top end of the limit rod (3) is located in the grounding shaft sleeve (9), the baffle (6) can be shielded outside the grounding shaft sleeve (9).

5. The lower door interlocking device of the high-voltage cabinet according to any one of claims 1 to 3, characterized in that: An eccentric shaft is provided on one end surface of the knob (1) facing the bracket (2), and the eccentric shaft forms the actuating member (11); The end surface of the knob (1) is provided with an insertion hole, and the eccentric shaft part can be inserted into the insertion hole and fixed by bolts.

6. The lower door interlocking device of the high-voltage cabinet according to any one of claims 1 to 3, characterized in that: The bracket (2) is also fixedly provided with a guide shaft (27), the outer wall of the guide shaft (27) is provided with a sliding groove (271) along the circumferential direction, the knob (1) is sleeved outside the guide shaft (27) and can rotate around the axis of the guide shaft (27), and the knob (1) is provided with a sliding screw (13), and the sliding screw (13) is located in the sliding groove (271) and can slide along the sliding groove (271).

7. The lower door interlocking device of the high-voltage cabinet according to any one of claims 1 to 3, characterized in that: An indication structure (12) is also provided on the end surface of the knob (1) away from the bracket (2), and the indication structure (12) is located on the axial extension line of the action member (11).

8. The lower door interlocking device of the high-voltage cabinet according to any one of claims 1 to 3, characterized in that: It also comprises a protective plate (7), the protective plate (7) being sleeved outside the knob (1), and an elastic member (8) being provided between the protective plate (7) and the bracket (2), the elastic member (8) being able to act on the protective plate (7) to move it to a side away from the bracket (2).

9. The lower door interlocking device of the high-voltage cabinet according to any one of claims 1 to 3, characterized in that: The bracket (2) comprises a mounting plate (24) and a mounting frame (25); the mounting plate (24) is used to be fixed to the mechanism; the knob (1) is rotatably connected to the mounting plate (24); The installation frame (25) is in a U-shaped structure, and the open end of the U-shaped structure is fixed to the installation plate (24); The limiting rod (3) is parallel to the mounting plate (24), and two ends of the limiting rod (3) respectively pass through two side walls of the U-shaped structure.

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