A combined cabinet with vacuum load switch and fuse

Abstract

The invention discloses a combination cabinet with a vacuum load switch and a fuse, characterized in that it comprises a cabinet body, a vacuum load switch, a lower door main interlock, a lower door auxiliary interlock, a drawer device and an isolating and grounding switch linkage locking device; the lower door main interlock is used to ensure that the lower cabinet door can be opened only when the vacuum load switch is opened; the lower door auxiliary interlock is used to ensure that the vacuum load switch remains opened when the lower cabinet door is opened, and can release the opening state of the vacuum load switch when the lower cabinet door is closed; an isolating switch operating head and a drawer locking device are arranged at the front end of the drawer device, and an isolating switch rear end square falcon is arranged at the rear end of the drawer device, and the isolating switch rear end square falcon can be inserted into the isolating and grounding switch linkage locking device to control the opening and closing of the isolating switch and the grounding switch. The combination cabinet has a compact structure, a strong overload and short-circuit protection capability, and a simple main and auxiliary interlock to prevent misoperation.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage power distribution equipment, and in particular to a combined cabinet with a vacuum load switch and a fuse. Background Art

[0002] Load switch-fuse combination cabinets are commonly used switchgear by electrical manufacturers. The size of the combination cabinets is generally large, and the combination cabinets on the market do not respond quickly enough when overload, short circuit, etc. occur.

[0003] When operating the combination cabinet, such as replacing and repairing the fuse, if the parts that need to be disconnected and closed are not operated in sequence, it is easy to cause life-threatening danger. Therefore, a special structure is required to guide the operation of the staff, and before the staff completes the relevant operations, the structure can intelligently perform circuit breaker protection to reduce risks.

[0004] When a failure occurs, it is sometimes difficult to confirm which combination cabinet has failed, so it is best to have a specific structure to express that the combination cabinet has failed, increase work efficiency and reduce maintenance time.

[0005] Therefore, how to improve the existing combination cabinet to overcome the above problems is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0006] The object of the present invention is to provide a combination cabinet with vacuum load switches and fuses which has compact structure, small size, strong overload and circuit breaker protection capabilities, fast response, simple main and auxiliary interlocking operation, high reliability, and no misoperation.

[0007] Another object of the present invention is to provide a lower door main and auxiliary interlock that ensures that when the vacuum load switch is closed, the isolating switch cannot be opened or closed, and the lower cabinet door cannot be opened; when the vacuum load switch is opened, the fuse isolating switch can be opened or closed, and does not block the opening of the lower cabinet door; when the lower cabinet door is opened, the vacuum load switch always remains in the open state; when the lower cabinet door is closed, the opening state of the vacuum load switch is automatically released, and the vacuum load switch can be closed.

[0008] Another object of the present invention is to provide a drawer device which is simple and convenient to push in and out, can cooperate with the locking device of the isolating and grounding switch, can be automatically locked after being pushed into the cabinet, has accurate axial positioning, and can accurately close the static contact without axial displacement when the isolating switch rotates.

[0009] Another object of the present invention is to provide an isolating and grounding switch linkage locking device which ensures that the lower cabinet door can be opened only when the isolating switch is opened and the grounding switch is closed.

[0010] To achieve the above purpose, the technical solution adopted by the present invention is: a combination cabinet with a vacuum load switch and a fuse, characterized in that it includes a cabinet body, a vacuum load switch, a lower door main interlock, a lower door auxiliary interlock, a drawer device and an isolating grounding switch linkage locking device;

[0011] The cabinet is used to fix all the above-mentioned equipment, a detachable lower cabinet door is arranged on the outside of the cabinet, and a cabinet partition is arranged inside the cabinet;

[0012] The vacuum load switch is arranged on the top of the cabinet, and a load switch half shaft is arranged inside for opening and closing the working current;

[0013] The lower door main interlock is used to ensure that the lower cabinet door can be opened only when the vacuum load switch is opened, and includes an on-off linkage crank arm, a main interlock plate, a fixed plate and a limit bottom plate. One end of the on-off linkage crank arm is connected to the load switch half shaft, and the fixed plate is arranged on the outer side of the cabinet partition. A waist-shaped guide groove and a tension spring bolt are provided on the main interlock plate. A guide stud passing through the waist-shaped guide groove is provided on the fixed plate. A guide tension spring for lifting the main interlock plate is provided between the tension spring bolt and the guide stud. The other end of the on-off linkage crank arm controls the lifting height of the main interlock plate, and the limit bottom plate is hinged to the bottom end of the main interlock plate.

[0014] The lower door auxiliary interlock is used to ensure that the vacuum load switch remains open when the lower cabinet door is opened, and can release the open state of the vacuum load switch when the lower cabinet door is closed, and includes an opening and closing linkage bent plate, an auxiliary interlocking push rod and a push rod guiding bent plate, the opening and closing linkage bent plate is connected to the load switch half shaft, the opening and closing linkage bent plate is connected to the top of the auxiliary interlock push rod, the push rod guiding bent plate is arranged on the outer side of the cabinet body partition, the auxiliary interlock push rod is provided with a cotter pin, a compression spring for lifting the auxiliary interlock push rod is arranged between the push rod guiding bent plate and the cotter pin, and a bent block is arranged at the bottom of the auxiliary interlock push rod, the bent block passes through the waist-shaped sliding groove provided at the bottom of the push rod guiding bent plate, and can be engaged with the lower cabinet door in the closed state;

[0015] The drawer device is slidably arranged in the cabinet, the isolating and grounding switch linkage locking device is arranged on the inner side of the drawer device, a fuse is arranged in the drawer device, an isolating switch operating head and a drawer locking device are arranged at the front end of the drawer device, and an isolating switch rear end square is arranged at the rear end of the drawer device. The isolating switch operating head can drive the isolating switch rear end square to rotate, and the isolating switch rear end square can be inserted into the isolating and grounding switch linkage locking device to control the opening and closing of the isolating switch and the grounding switch.

[0016] Specifically, the isolating and grounding switch linkage locking device includes an isolating switch linkage crank arm, an isolating and grounding linkage connecting rod, a grounding switch linkage crank arm and a grounding switch baffle. One end of the isolating switch linkage crank arm is clamped with the rear end square of the isolating switch. The isolating and grounding linkage connecting rod is respectively connected with the other end of the isolating switch linkage crank arm and one end of the grounding switch linkage crank arm. The other end of the grounding switch linkage crank arm controls the rotation of the grounding switch baffle. When the rear end square of the isolating switch is clamped into the isolating and grounding switch linkage locking device, the isolating switch is closed, the grounding switch baffle rotates, the grounding switch is opened, and the lower cabinet door is clamped to prevent the lower cabinet door from opening.

[0017] As an improvement, a limiting column is arranged on the limiting bottom plate, and a lower door waist groove and an isolating switch operating hole are arranged on the lower cabinet door. The isolating switch operating hole is used to operate the isolating switch operating head, and the limiting column can slide in the lower door waist groove. When the vacuum load switch is closed, the limiting bottom plate covers the isolating switch operating hole. When the vacuum load switch is opened, the main interlock plate drives the limiting bottom plate to rise, exposing the isolating switch operating hole.

[0018] Specifically, the drawer locking device includes a hand-pull plate, a triangular plate, a lock plate and a locking tension spring. A fixing hole is provided on the triangular plate, and the triangular plate is fixed to the drawer device through the fixing hole. The hand-pull plate is rotatably arranged between the two triangular plates, and the two lock plates are rotatably arranged on the outer sides of the two triangular plates respectively. Two waist-shaped sliding holes are provided on the lock plate, and the lock plate is horizontally slidably arranged under the drawer device through the two waist-shaped sliding holes. One end of the locking tension spring is connected to the bolt at the waist-shaped sliding hole, and the other end is connected to the bolt at the connection between the lock plate and the triangular plate.

[0019] Specifically, the lower door auxiliary interlock also includes a release arm and a releaser, the release arm and the releaser are connected to each other and rotatably arranged on the outside and inside of the cabinet partition, and one end of the release arm is rotatably connected to the auxiliary interlock top rod.

[0020] As an improvement, a square hole is provided on the inner surface of the lower cabinet door, and a latch plate corresponding to the square hole is provided on the cabinet body. The lower cabinet door can be removed only after being lifted upward to disengage the square hole from the latch plate.

[0021] As an improvement, an outer end of the lock plate is provided with an inclined surface which facilitates the lock plate to slide inwardly through the cabinet when the lock plate contacts the cabinet.

[0022] As an improvement, the connection between the triangular plate and the hand-pull plate and the connection between the triangular plate and the lock plate are both configured as waist-shaped rotating holes.

[0023] As an improvement, a lock plate guide bent plate is further provided on the cabinet partition, and the lock plate guide bent plate is used to guide the main interlocking plate to move in the vertical direction.

[0024] Compared with the prior art, the advantages of the present invention are: the combined cabinet realizes automatic and rapid opening of the combined cabinet when it is overloaded or short-circuited through the cooperation of the lower door main interlock, the lower door auxiliary interlock and the isolating grounding switch linkage locking device. When the vacuum load switch is opened due to a fault, the limit bottom plate can be automatically raised to expose the isolating switch operation hole, which is convenient for the staff to confirm the faulty machine and perform subsequent operations. Due to the cooperation of the grounding switch baffle and the latch plate, the lower cabinet door cannot be opened before closing the grounding switch, so the grounding switch must be closed first, and the isolating switch must be disconnected at the same time before the lower cabinet door can be opened smoothly. After the lower cabinet door is opened, the auxiliary interlock plate operates to keep the vacuum load switch opened, ensuring that the lower cabinet door is opened. To ensure safety, the drawer device can be pulled out to replace the fuse. Replacing the fuse outside the cabinet is convenient, fast and safe. The drawer device is provided with a drawer locking device, which can be simply and quickly locked with the cabinet when pushed into the cabinet, and accurately docked with the isolating and earthing switch linkage locking device and accurately positioned axially. The isolating switch can accurately close the static contact, and the rear end square of the isolating switch at the rear can realize the connection control of the isolating and earthing switch linkage locking device, and finally install it back to the lower cabinet door, and the main and auxiliary interlocks are reset and closed. The combination cabinet requires a specific operation sequence to smoothly open the lower cabinet door for maintenance and replacement to ensure the safety of personnel, and it will not operate at will after opening, reducing risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a front view of the internal structure according to a preferred embodiment of the present invention;

[0026] Figure 2 is a rear view of the internal structure according to a preferred embodiment of the present invention;

[0027] Figure 3 According to a preferred embodiment of the present invention Figure 1 Section view along AA direction;

[0028] Figure 4 According to a preferred embodiment of the present invention Figure 1 Section view along BB direction;

[0029] Figure 5 is a top view of a drawer device according to a preferred embodiment of the present invention;

[0030] Figure 6 is a front view of a drawer device according to a preferred embodiment of the present invention;

[0031] Figure 7is a structural principle view of a drawer locking device according to a preferred embodiment of the present invention;

[0032] Figure 8 According to a preferred embodiment of the present invention Figure 3 The enlarged schematic diagram of the main interlocking plate activity at a in the middle;

[0033] Fig. 9 According to a preferred embodiment of the present invention Figure 1 An enlarged view of the fixed plate connection structure at point b in the middle;

[0034] Fig.10 According to a preferred embodiment of the present invention Figure 3 The enlarged schematic diagram of the limit bottom plate activity at c in the middle;

[0035] Fig.11 According to a preferred embodiment of the present invention Figure 1 The enlarged view of the isolating switch operating hole structure at d in the middle;

[0036] Fig.12 According to a preferred embodiment of the present invention Figure 1 The enlarged view of the tripper arm structure at e in the middle;

[0037] Fig.13 According to a preferred embodiment of the present invention Figure 1 Enlarged diagram showing the movement of the grounding switch baffle at point f in the middle. DETAILED DESCRIPTION

[0038] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0039] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0040] The present invention will be further described below in conjunction with the accompanying drawings:

[0041] like Figures 1 to 13As shown, a preferred embodiment of the present invention includes a cabinet 1, a vacuum load switch 2, a lower door main interlock 3, a lower door auxiliary interlock 4, a drawer device 5 and an isolating and grounding switch linkage locking device 6.

[0042] The cabinet 1 is used to fix all the above-mentioned devices. A detachable lower cabinet door 11 is arranged outside the cabinet 1 , and a cabinet partition 12 is arranged inside the cabinet 1 .

[0043] The vacuum load switch 2 is arranged on the top of the cabinet 1, and a load switch half shaft 21 is arranged inside for switching on and off the working current.

[0044] The lower door main interlock 3 is used to ensure that the isolating switch 61 cannot be operated when the vacuum load switch 2 is closed, and the lower cabinet door 11 can be opened only when the vacuum load switch 2 is opened. It includes a split-close linkage crank arm 31, a main interlock plate 32, a fixed plate 33 and a limit bottom plate 34. One end of the split-close linkage crank arm 31 is connected to the load switch half shaft 21, and the fixed plate 33 is arranged on the outer side of the cabinet partition 12. The main interlock plate 32 is provided with a waist-shaped guide groove 321 and a tension spring bolt 322, which is fixed A guide stud 331 passing through the waist-shaped guide groove 321 is provided on the fixed plate 33, and a guide tension spring 35 for lifting the main interlocking plate 32 is provided between the tension spring bolt 322 and the guide stud 331. The other end of the separation and combination linkage crank arm 31 controls the lifting height of the main interlocking plate 32. The limiting bottom plate 34 is hinged to the bottom end of the main interlocking plate 32. A lock plate guide bent plate 36 is also provided on the cabinet partition 12. The lock plate guide bent plate 36 is used to guide the main interlocking plate 32 to move in the vertical direction.

[0045] The lower door auxiliary interlock 4 is used to ensure that the vacuum load switch 2 remains open when the lower cabinet door 11 is opened, and the vacuum load switch 2 remains open when the lower cabinet door 11 is closed, and can be closed. It includes an opening and closing linkage bent plate 41, an auxiliary interlocking push rod 42 and a push rod guide bent plate 43. The opening and closing linkage bent plate 41 is connected to the load switch half shaft 21 and is used to control the opening and closing of the vacuum load switch 2. The opening and closing linkage bent plate 41 is connected to the top of the auxiliary interlock push rod 42, and the push rod guide bent plate 43 is arranged on the outside of the cabinet partition 12. An opening pin 421 is arranged on the auxiliary interlock push rod 42, and a compression spring 44 for lifting the auxiliary interlock push rod 42 is arranged between the push rod guide bent plate 43 and the opening pin 421. A bent stop 422 is arranged at the bottom of the auxiliary interlock push rod 42. The bent stop 422 passes through the waist-shaped sliding groove 431 opened at the bottom of the push rod guide bent plate 43, and can be engaged with the lower cabinet door 11 in the closed state.

[0046] The drawer device 5 is slidably arranged in the cabinet 1, the isolating and grounding switch linkage locking device 6 is arranged on the inner side of the drawer device 5, a fuse 51 is arranged in the drawer device 5, an isolating switch operating head 52 and a drawer locking device 53 are arranged at the front end of the drawer device 5, and an isolating switch rear end square 54 is arranged at the rear end of the drawer device 5. The isolating switch operating head 52 can drive the isolating switch rear end square 54 to rotate, and the isolating switch rear end square 54 can be inserted into the isolating and grounding switch linkage locking device 6 to control the opening and closing of the isolating switch 61 and the grounding switch 62.

[0047] The isolating and grounding switch linkage locking device 6 comprises an isolating switch linkage crank arm 63, an isolating and grounding linkage connecting rod 64, a grounding switch linkage crank arm 65 and a grounding switch baffle 66. One end of the isolating switch linkage crank arm 63 is clamped with the isolating switch rear end square 54, and the isolating and grounding linkage connecting rod 64 is respectively connected with the other end of the isolating switch linkage crank arm 63 and one end of the grounding switch linkage crank arm 65. The other end of the grounding switch linkage crank arm 65 controls the rotation of the grounding switch baffle 66. When the isolating switch rear end square 54 is clamped into the isolating and grounding switch linkage locking device 6, the isolating switch 61 is closed, the grounding switch baffle 66 rotates, the grounding switch 62 is opened, and the lower cabinet door 11 is clamped to prevent the lower cabinet door 11 from opening.

[0048] A limiting column 341 is provided on the limiting bottom plate 34, and a lower door waist groove 111 and an isolating switch operating hole 112 are provided on the lower cabinet door 11. The isolating switch operating hole 112 is used to operate the isolating switch operating head 52. The limiting column 341 can slide in the lower door waist groove 111. When the vacuum load switch 2 is closed, the limiting bottom plate 34 covers the isolating switch operating hole 112. When the vacuum load switch 2 is opened, the main interlocking plate 32 drives the limiting bottom plate 34 to rise, exposing the isolating switch operating hole 112.

[0049] The lower door auxiliary interlock 4 also includes a tripper arm 45 and a tripper 46, which are interconnected and rotatably arranged on the outside and inside of the cabinet partition 12. One end of the tripper arm 45 is rotatably connected to the auxiliary interlock top rod 42. When an overload greater than a set value or a short-circuit current occurs, the fuse 51 blows, the fuse striker pops out, and the top-rotating tripper 46 drives the tripper arm 45 to rotate, thereby moving the auxiliary interlock top rod 42 downward, pulling the load switch half shaft 21 to rotate, and opening the vacuum load switch 2.

[0050] A square hole 113 is disposed on the inner surface of the lower cabinet door 11 , and a latch plate 114 corresponding to the square hole 113 is disposed on the cabinet body 1 . The lower cabinet door 11 can be removed only after the square hole 113 is lifted upward to disengage the latch plate 114 .

[0051] When the load switch is closed: the operation sequence is to first close the lower cabinet door 11, then open the grounding switch 62, then close the isolating switch 61, and finally close the vacuum load switch 2. The opening and closing linkage crank arm 31 rotates downward to the lowest position, and the opening and closing linkage crank arm 31 presses against the top surface of the main interlock plate 32 to force the main interlock plate 32 to slide downward to the lowest position. The main interlock plate 32 slides vertically downward under the guidance of the guide stud 331, the tension spring bolt 322 and the lock plate guide bent plate 36, and the limit bottom plate 34 and the limit column 341 slide down to the lowest position accordingly. At this position, the limit bottom plate 34 covers the isolating switch operating hole 112, and the limit column 341 blocks the lower arc surface of the lower door waist groove 111 of the lower cabinet door 11. Therefore, the lower cabinet door 11 cannot move up and disengage the latch plate 114. The latch plate 114 buckles the lower cabinet door 11, and the lower cabinet door 11 cannot be opened. The limit bottom plate 34 covers the isolating switch operating hole 112, and the isolating switch 61 cannot be operated.

[0052] When the load switch is opened: the operation sequence is to open the vacuum load switch 2 first, then open the isolating switch 61, then close the grounding switch 62, and finally open the lower cabinet door 11. The opening and closing linkage crank arm 31 rotates upward to the highest position. Due to the action of the guide tension spring 35, the guide stud 331, the tension spring bolt 322 and the lock plate guide bent plate 36, the main interlocking plate 32 always rises to the highest position close to the opening and closing linkage crank arm 31. At this position, the limit bottom plate 34 leaves the isolating switch operating hole 112, and the special The operating lever can open and close the isolating switch 61. Since the isolating switch 61 and the grounding switch 62 are linked, the grounding switch 62 is closed when the isolating switch 61 is opened. When the grounding switch 62 is closed, the grounding switch baffle 66 leaves the lower door stop 13. At this time, the lower cabinet door 11 can be moved up to align the 6 square holes 113 of the lower cabinet door 11 with the 6 latch plates 114 to pull out the lower cabinet door 11. After the lower cabinet door 11 is opened, the limit bottom plate 34 can be flipped up, and then the drawer device 5 can be pulled out to replace the fuse 51.

[0053] When the lower cabinet door 11 is closed, the top frame of the lower cabinet door 11 presses the bend 422 of the auxiliary interlocking push rod 42, and the auxiliary interlocking push rod 42 is pulled down to force the compression spring 44 to compress and store energy. When the lower cabinet door 11 is opened, the constraint of the bend 422 is released, the energy of the compression spring 44 is released, and the auxiliary interlocking push rod 42 moves up to impact the separation and combination linkage bend plate 41, forcing the load switch half shaft 21 to rotate, and the vacuum load switch 2 is opened.

[0054] After the lower cabinet door 11 is opened, the bend 422 of the auxiliary interlocking push rod 42 is not constrained. In this state, if the vacuum load switch 2 is closed, the load switch half-shaft 21 rotates to drive the separation and closing linkage bent plate 41 to rotate downward, pressing the auxiliary interlocking push rod 42 to move downward, and the compression spring 44 is compressed to store energy. When the closing action is completed, the auxiliary interlocking push rod 42 is immediately reset under the action of the compression spring 44 to impact the separation and closing linkage bent plate 41, forcing the load switch half-shaft 21 to rotate in the opposite direction, and the vacuum load switch 2 is opened. Therefore, as long as the lower cabinet door 11 is open, the vacuum load switch 2 cannot be closed.

[0055] The drawer locking device 53 includes a hand-pull plate 531, a triangular plate 532, a locking plate 533 and a locking tension spring 534. The triangular plate 532 is provided with a fixing hole 535, and the triangular plate 532 is fixed to the drawer device 5 through the fixing hole 535. The hand-pull plate 531 is rotatably arranged between the two triangular plates 532. The two locking plates 533 are rotatably arranged on the outer sides of the two triangular plates 532. The connection between the triangular plate 532 and the hand-pull plate 531 and the connection between the triangular plate 532 and the locking plate 533 are all provided with waist-shaped rotating holes 536. The locking plate 533 is provided with two waist-shaped sliding holes 537. The locking plate 533 is provided with two waist-shaped sliding holes 537. The hole 537 is set to slide horizontally below the drawer device 5, one end of the locking spring 534 is connected to the bolt at the waist-shaped sliding hole 537, and the other end is connected to the bolt at the connection between the lock plate 533 and the triangular plate 532. The outer end of the lock plate 533 is provided with a slope 538 for facilitating the lock plate 533 to slide inward through the cabinet 1 when the lock plate 533 contacts the cabinet 1. In this way, when the drawer device 5 is pushed into the cabinet 1, the slope 538 on the outside of the lock plate 533 first hits the cabinet 1, and the lock plate 533 moves toward the hand-pull plate 531 under the action of the slope 538, forcing the triangular plate 532 to rotate toward the hand-pull plate 531, thereby reducing the difficulty of locking.

[0056] The three fuses 51 are respectively installed on the three phases of the isolating switch 61, and the isolating switch 61 is arranged in the drawer device 5. When the lower cabinet door 11 is opened, the drawer device 5 can be pulled out of the cabinet 1 to a limited position, and the fuse 51 can be replaced outside the cabinet 1 at this position; when the drawer device 5 is pushed in, the square falcon 54 at the rear end of the isolating switch can be accurately embedded in the square groove of the isolating switch linkage arm 63. Because the isolating switch 61 is linked with the grounding switch 62, and the grounding switch 62 has only two determined positions of open or closed, the isolating switch linkage arm 63 also has only two determined positions, and when the drawer device 5 is pushed in, the position of the square falcon 54 at the rear end of the isolating switch is also fixed, so the square falcon 54 at the rear end of the isolating switch can be accurately pushed into the square groove of the isolating switch linkage arm 63, and the isolating switch linkage arm 63 is axially limited in the cabinet 1 and cannot move.

[0057] In order to prevent the drawer device 5 from moving toward the lower cabinet door 11 when the isolating switch 61 is rotated, a drawer locking device 53 is also provided on the drawer device 5. When the lock plate 533 is fully pushed into the cabinet body 1, the locking tension spring 534 releases energy, the triangular plate 532 rotates to the original position, and the lock plate 533 extends out and is stuck in the cabinet body 1. At this position, the end of the drawer device 5 is pushed into the square groove of the isolating switch linkage arm 63 by the square falcon 54 at the rear end of the isolating switch, and the lock plate 533 is stuck in the front by the cabinet body 1. The drawer device 5 cannot move axially, thereby ensuring that the isolating switch is locked. When the switch 61 rotates, the static contact can be accurately closed. When the drawer device 5 needs to be pulled out, the hand-pull plate 531 is pulled outward by hand, and the hand-pull plate 531 moves outward, causing the triangular plate 532 to rotate toward the hand-pull plate 531, forcing the locking plate 533 to retract toward the hand-pull plate 531 and slide out of the cabinet body 1. At the same time, the locking tension spring 534 is stretched to store energy, and the drawer device 5 can be pulled out of the cabinet body 1. When the hand-pull plate 531 is released, the locking tension spring 534 releases energy, the triangular plate 532 rotates to its original position, and the locking plate 533 also returns to its initial position.

[0058] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A combination cabinet with a vacuum load switch and a fuse, characterized in that: It includes a cabinet, a vacuum load switch, a lower door main interlock, a lower door auxiliary interlock, a drawer device and an isolating earthing switch linkage locking device; The cabinet is used to fix all the above-mentioned equipment, a detachable lower cabinet door is arranged on the outside of the cabinet, and a cabinet partition is arranged inside the cabinet; The vacuum load switch is arranged on the top of the cabinet, and a load switch half shaft is arranged inside for opening and closing the working current; The lower door main interlock is used to ensure that the lower cabinet door can be opened only when the vacuum load switch is opened, and includes an on-off linkage crank arm, a main interlock plate, a fixed plate and a limit bottom plate. One end of the on-off linkage crank arm is connected to the load switch half shaft, and the fixed plate is arranged on the outer side of the cabinet partition. A waist-shaped guide groove and a tension spring bolt are provided on the main interlock plate. A guide stud passing through the waist-shaped guide groove is provided on the fixed plate. A guide tension spring for lifting the main interlock plate is provided between the tension spring bolt and the guide stud. The other end of the on-off linkage crank arm controls the lifting height of the main interlock plate, and the limit bottom plate is hinged to the bottom end of the main interlock plate. The lower door auxiliary interlock is used to ensure that the vacuum load switch remains open when the lower cabinet door is opened, and can release the open state of the vacuum load switch when the lower cabinet door is closed, and includes an opening and closing linkage bent plate, an auxiliary interlocking push rod and a push rod guiding bent plate, the opening and closing linkage bent plate is connected to the load switch half shaft, the opening and closing linkage bent plate is connected to the top of the auxiliary interlock push rod, the push rod guiding bent plate is arranged on the outer side of the cabinet body partition, the auxiliary interlock push rod is provided with a cotter pin, a compression spring for lifting the auxiliary interlock push rod is arranged between the push rod guiding bent plate and the cotter pin, and a bent block is arranged at the bottom of the auxiliary interlock push rod, the bent block passes through the waist-shaped sliding groove provided at the bottom of the push rod guiding bent plate, and can be engaged with the lower cabinet door in the closed state; The drawer device is slidably arranged in the cabinet, the isolating and grounding switch linkage locking device is arranged inside the drawer device, a fuse is arranged in the drawer device, an isolating switch operating head and a drawer locking device are arranged at the front end of the drawer device, and an isolating switch rear end square is arranged at the rear end of the drawer device, the isolating switch operating head can drive the isolating switch rear end square to rotate, and the isolating switch rear end square can be inserted into the isolating and grounding switch linkage locking device to control the opening and closing of the isolating switch and the grounding switch; The isolating and grounding switch linkage locking device comprises an isolating switch linkage crank arm, an isolating and grounding linkage connecting rod, a grounding switch linkage crank arm and a grounding switch baffle. One end of the isolating switch linkage crank arm is clamped with the rear end square of the isolating switch. The isolating and grounding linkage connecting rod is respectively connected with the other end of the isolating switch linkage crank arm and one end of the grounding switch linkage crank arm. The other end of the grounding switch linkage crank arm controls the rotation of the grounding switch baffle. When the rear end square of the isolating switch is clamped into the isolating and grounding switch linkage locking device, the isolating switch is closed, the grounding switch baffle rotates, the grounding switch is opened, and the lower cabinet door is clamped to prevent the lower cabinet door from opening. The drawer locking device includes a hand-pull plate, a triangular plate, a lock plate and a locking tension spring. A fixing hole is provided on the triangular plate, and the triangular plate is fixed to the drawer device through the fixing hole. The hand-pull plate is rotatably arranged between the two triangular plates, and the two lock plates are rotatably arranged on the outer sides of the two triangular plates respectively. Two waist-shaped sliding holes are provided on the lock plate, and the lock plate is horizontally slidably arranged under the drawer device through the two waist-shaped sliding holes. One end of the locking tension spring is connected to the bolt at the waist-shaped sliding hole, and the other end is connected to the bolt at the connection between the lock plate and the triangular plate.

2. A combination cabinet with a vacuum load switch and a fuse according to claim 1, characterized in that: The limiting bottom plate is provided with a limiting column, the lower cabinet door is provided with a lower door waist groove and an isolating switch operating hole, the isolating switch operating hole is used to operate the isolating switch operating head, the limiting column can slide in the lower door waist groove, when the vacuum load switch is closed, the limiting bottom plate covers the isolating switch operating hole, when the vacuum load switch is opened, the main interlocking plate drives the limiting bottom plate to rise, exposing the isolating switch operating hole.

3. A combination cabinet with a vacuum load switch and a fuse according to claim 1, characterized in that: The lower door auxiliary interlock also includes a release arm and a releaser, the release arm and the releaser are connected to each other and rotatably arranged on the outer side and the inner side of the cabinet partition, and one end of the release arm is rotatably connected to the auxiliary interlock top rod.

4. A combination cabinet with a vacuum load switch and a fuse according to claim 1, characterized in that: The inner surface of the lower cabinet door is provided with a square hole, and the cabinet body is provided with a latch plate corresponding to the square hole. The lower cabinet door can be removed only after being lifted upward to make the square hole disengage from the latch plate.

5. A combination cabinet with a vacuum load switch and a fuse according to claim 4, characterized in that: The outer end of the lock plate is provided with an inclined surface which facilitates the lock plate to slide inwardly through the cabinet when the lock plate contacts the cabinet.

6. A combination cabinet with a vacuum load switch and a fuse according to claim 4, characterized in that: The connection parts between the triangular plate and the hand-pull plate and between the triangular plate and the lock plate are both configured as waist-shaped rotating holes.

7. The combined cabinet with vacuum load switch and fuse according to claim 1, characterized in that: A lock plate guide bent plate is also provided on the cabinet partition, and the lock plate guide bent plate is used to guide the main interlocking plate to move in the vertical direction.

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