Cabinet door interlocking mechanism applied to inflatable high-voltage switch cabinet

Abstract

The invention relates to the technical field of inflatable high-voltage switch cabinets, in particular to a cabinet door interlocking mechanism applied to an inflatable high-voltage switch cabinet. Comprising a vacuum circuit breaker and a three-position switch which are installed in a cabinet door b, an interlocking mechanism is arranged in a cabinet door a located below the cabinet door b, the interlocking mechanism is installed on the inner side of a cabinet wall, an emergency unlocking device is fixed to the outer side of the cabinet door a, and the back face of the emergency unlocking device is fixedly connected with a pull rod penetrating through the cabinet door a; the interlocking mechanism comprises a front guide plate and a rear guide plate which are respectively fixed on the cabinet wall from front to back; a front push rod and a rear push rod are respectively inserted into the front guide plate and the rear guide plate and are fixedly connected through a push rod connecting plate; the safety of the inflatable high-voltage switch cabinet is greatly improved, and danger caused by mistaken door opening of an operator is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of gas-insulated high-voltage switchgear, and particularly to a door interlock mechanism applied to a gas-insulated high-voltage switchgear. Background Art

[0002] A gas-insulated high-voltage switchgear (GIS) is a high-voltage power distribution device that seals high-voltage electrical components (such as circuit breakers, disconnectors, earthing switches, current transformers, voltage transformers, busbars, etc.) in a metal housing filled with insulating gas (such as a mixed gas of sulfur hexafluoride, nitrogen, etc.); its core feature is to utilize the excellent insulation performance and arc extinguishing ability of the insulating gas to achieve miniaturization, high reliability, and maintenance-free operation of the device.

[0003] Currently, the mechanical interlock mechanisms of gas-insulated high-voltage switchgears on the market are not well-designed and cannot meet the safety standard requirements of the products. When opening or closing the switchgear door, there is always a situation where the closing states of its internal components such as circuit breakers and three-position switches are unknown, or the operator forgets the steps and sequence of closing (or opening), often leading to danger.

[0004] Generally, (1) only when the earthing switch is closed can the door of the cable chamber be opened; (2) only after the door of the cable chamber is closed can the earthing switch in the closed position be opened, and it is linked with other components at the same time. Therefore, there is an urgent need for an interlock mechanism suitable for a gas-insulated high-voltage switchgear to solve the above problems. Summary of the Invention

[0005] In order to make up for the deficiencies in the prior art and achieve the above functions, the present invention provides a door interlock mechanism applied to a gas-insulated high-voltage switchgear.

[0006] The present invention is realized through the following technical solutions: A door interlock mechanism applied to a gas-insulated high-voltage switchgear includes a vacuum circuit breaker and a three-position switch installed in door b of the switchgear. An interlock mechanism is provided in door a below door b. The interlock mechanism is installed on the inner side of the cabinet wall. An emergency unlocking device is fixed on the outer side of door a, and the back of the emergency unlocking device is fixedly connected to a pull rod passing through door a; The interlock mechanism includes a front guide plate and a rear guide plate respectively fixed on the cabinet wall before and after. A front push rod and a rear push rod are respectively inserted into the front guide plate and the rear guide plate, and the two are fixedly connected by a push rod connecting plate. A rotating clamping plate that can be clamped with the pull rod after rotation is installed on the front push rod. A limit baffle is welded to the bottom of the rear push rod, and an insertion ring a and an insertion ring b are fixed on the side of the rear push rod; The vacuum circuit breaker further includes a longitudinal rod c that can control the opening and closing states by moving up and down and a longitudinal rod d that passively displays the opening and closing states; a driving block is provided at the bottom end of the longitudinal rod c, and the driving block is rotatably connected to a right-angled rotating angle plate through a rear steering sleeve, and the other end of the rotating angle plate can abut against a limit baffle; the bottom of the longitudinal rod d can pass through an insertion ring a fixed on the side of the rear push rod. The three-position switch includes a vertical longitudinal rod b on its side, and a barb is installed at the bottom of the longitudinal rod b, and the position of the barb corresponds to the position of the opening of the insertion ring b.

[0007] Further, the front guiding plate is rotatably connected to a rotating clamping plate through a fixed front steering sleeve b, the rotating clamping plate is rotatably connected to a front steering sleeve a fixed on the front guiding plate through a rounded rectangular groove at one end thereof, and when the rotating clamping plate rotates with the front steering sleeve b as the center of rotation, the front steering sleeve a can slide in the rounded rectangular groove; a clamping plate joint perpendicular to the end face is provided at the other end of the rotating clamping plate, and a groove is provided in the latter half of the pull rod, and the clamping plate joint can be clamped in this groove after rotating to the horizontal state.

[0008] Further, a rotating rod mounting block is installed on the cabinet wall, the rotating angle plate is rotatably connected to the rotating rod mounting block through a rear steering sleeve and the rotating angle plate rotates with the rear steering sleeve as the center of rotation, and when the rotating angle plate rotates counterclockwise, it will contact the bottom of the limit baffle and then push the rear push rod forward; An arc groove is provided at one end of the rotating angle plate located in the rear steering sleeve, and the rear steering sleeve is clamped in this circular arc groove and can also slide when the rotating angle plate rotates.

[0009] Further, the vacuum circuit breaker further includes a built-in circuit breaker main shaft, and an end plate is fixed on the side of the circuit breaker main shaft. The circuit breaker main shaft and the vertical longitudinal rod d form a crank and connecting rod transmission mechanism through the end plate, and the longitudinal rod d extends downward through a through hole on the bottom plate of the vacuum circuit breaker.

[0010] Further, a movable block is fixed at the top of the longitudinal rod c, and the movable block is rotatably connected to an upper cam plate through a transverse arc groove hole at its top. The cam plate is located at the side end of a jogging shaft built in the vacuum circuit breaker, and a stop piece is fixed in the radial direction at the other end of the jogging shaft, and the stop piece can collide with a built-in switch button for the opening state.

[0011] Further, the three-position switch further includes an auxiliary switch drive shaft disposed therein. A drive block is fixed along the radial direction of the auxiliary switch drive shaft. The drive block abuts against a roller on the side. The roller is rotatably fixed on a lateral drive rod of the three-position switch. The lateral drive rod can only displace left and right, and the other end thereof is rotatably connected to an inclined oblique drive rod through a rotating shaft. The other end of the oblique drive rod is rotatably connected to a longitudinal rod a through a sliding clamping shaft. The bottom of the longitudinal rod a is fixedly connected to a longitudinal rod b through a longitudinal connecting block. The oblique drive rod can rotate and move up and down with the sliding clamping shaft as the center of the circle.

[0012] Further, a limit plate a is installed in the three-position switch. The limit plate a is formed by splicing multiple layers of sheet metal and is provided with horizontal through holes. The lateral drive rod passes through the horizontal through holes on the limit plate a; A limit plate b is also installed in the three-position switch, and the sliding clamping shaft is clamped in the slot hole of the limit plate b; A plurality of longitudinal limit plates are installed on the inner side of the cabinet wall. The longitudinal limit plates are in a right-angled shape and are provided with downward through holes. Both the longitudinal rod c and the longitudinal rod b pass through the longitudinal limit plates corresponding to their positions.

[0013] Further, a spring support is fixed on the lateral drive rod. A spring is installed between the spring support and the limit plate a, and a tension spring is installed between the longitudinal connecting block and the limit plate b. Both the spring and the tension spring can reset the longitudinal rod b upward.

[0014] Further, a pre-positioned guide ring is also provided on the pre-positioned guide plate. The pre-positioned guide ring is located behind the pre-positioned turning sleeve b and is always penetrated by the pre-positioned push rod; A clamping block capable of passing through the opening of the insertion ring a is installed at the bottom of the longitudinal rod. The barb can pass through the insertion ring b to make the two inserted.

[0015] The beneficial effects of the present invention are: The present invention can directly connect to a vacuum circuit breaker and a three-position switch by using an interlocking mechanism, and combine multiple pure mechanical link mechanisms to ensure that (1) only when the three-position switch is grounded, the circuit breaker is closed, and the grounding circuit is connected, can the cabinet door of the cable chamber be opened at this time; (2) only when the vacuum circuit breaker is tripped and the three-position switch is grounded and tripped, can the cabinet door of the cable chamber be closed; (3) when any part of the circuit breaker and the three-position switch is tripped, the cable chamber door cannot be opened. Greatly improves safety and prevents operators from accidentally opening the door and causing danger. Description of the Drawings

[0016] Figure 1 is a three-dimensional view of the external structure of an air-filled high-voltage switchgear cabinet; Figure 2 is a schematic diagram of some components inside the air-filled high-voltage switchgear cabinet; Figure 3 This is an assembly schematic diagram of the interlocking mechanism, vacuum circuit breaker and three-position switch in the present invention; Figure 4 This is a three-dimensional schematic diagram when the interlocking mechanism is locked; Figure 5 This is Figure 3 another perspective view of; Figure 6 This is an enlarged schematic diagram of some components inside the three-position switch; Figure 7 This is a right view of the interlocking mechanism, vacuum circuit breaker and three-position switch; Figure 8 This is a state diagram when the interlocking mechanism is unlocked; Figure 9 This is an internal schematic diagram of the vacuum circuit breaker.

[0017] In the figure: 1. Cabinet wall, 101. Door a, 102. Door b, 2. Interlocking mechanism, 201. Rear guide plate, 202. Front guide plate, 2021. Guide baffle, 203. Rear push rod, 204. Push rod connecting plate, 205. Front push rod, 206. Front guide ring, 3. Vacuum circuit breaker, 301. Retaining piece, 302. Jog shaft, 303. Cam plate, 304. Movable block, 305. Longitudinal rod c, 306. Longitudinal limit plate, 307. Circuit breaker main shaft, 308. End plate, 309. Longitudinal rod d, 3091. Clamping block, 3092. Insertion ring a, 4. Three-position switch, 401. Auxiliary switch drive shaft, 402. Transmission block, 403. Roller, 404. Horizontal transmission rod, 4041. Limit plate a, 405. Oblique transmission rod, 406. Sliding clamping shaft, 4061. Limit plate b, 407. Longitudinal rod a, 408. Longitudinal connection block, 409. Longitudinal rod b, 4091. Insertion ring b, 4092. Barbed hook, 410. Tension spring, 411. Spring, 5. Rotating rod mounting block, 501. Rotating angle plate, 502. Limit baffle, 503. Rear steering sleeve a, 504. Rear steering sleeve b, 505. Driving block, 6. Rotating clamping plate, 601. Front steering sleeve a, 602. Front steering sleeve b, 603. Clamping plate joint, 7. Emergency unlocking device, 701. Pull rod. Detailed implementation mode

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0020] Reference Figures 1 to 9 , the present invention includes a vacuum circuit breaker 3 and a three-position switch 4 installed in the cabinet door b102. Of course, these two types of electrical control devices exist in existing gas-insulated high-voltage switchgears. What the present invention emphasizes is the innovative improvement of the internal structure of the existing equipment; an interlocking mechanism 2 is provided in the cabinet door a101 below the cabinet door b102 to be linked with the vacuum circuit breaker 3 and the three-position switch 4 above; the interlocking mechanism 2 is installed on the inner side of the cabinet wall 1, and an emergency unlocking device 7 is fixed on the outer side of the cabinet door a101, and the back of the emergency unlocking device 7 is fixedly connected to a pull rod 701 passing through the cabinet door a101, serving as a switch for opening the cabinet door; As Figure 4 shown, the interlocking mechanism 2 includes a front guiding plate 202 and a rear guiding plate 201 respectively fixed on the cabinet wall 1 before and after, serving as guiding components of the interlocking mechanism; a front push rod 205 and a rear push rod 203 are respectively inserted through the front guiding plate 202 and the rear guiding plate 201 and are fixedly connected by a push rod connecting plate 204. As shown in the figure, in order to avoid interference, the front and rear push rods are not in the same vertical plane on the left and right; a rotating clamping plate 6 that can be clamped with the pull rod 701 after rotation is installed on the front push rod 205; a limiting baffle 502 is welded to the bottom of the rear push rod 203, and an insertion ring a3092 and an insertion ring b4091 are fixed on the side of the rear push rod 203. After they are vertically inserted or clamped, the front push rod 205 and the rear push rod 203 cannot move back and forth.

[0021] As Figure 8 、 9As shown, the vacuum circuit breaker 3 further includes a longitudinal rod c305 and a longitudinal rod d309 that can control the opening and closing states by moving up and down (the upward movement of the longitudinal rod d309 represents that the vacuum circuit breaker 3 is in the closed state, and the downward movement of the longitudinal rod c305 means that the opening control switch of the vacuum circuit breaker is turned on, and at this time, the circuit breaker cannot be disconnected); a driving block 505 is provided at the bottom end of the longitudinal rod c305, and the driving block 505 is rotatably connected to a right-angled rotating angle plate 501 through a rear steering sleeve 504. The other end of the rotating angle plate 501 can abut against a limit baffle 502, which is a driving component of the interlocking mechanism 2; the bottom of the longitudinal rod d309 can pass through an insertion ring a3092 fixed on the side of the rear push rod 203 to prevent the front and rear movement of the interlocking mechanism 2. The three-position switch 4 includes a vertical longitudinal rod b409 on its side. A barb 4092 is installed at the bottom of the longitudinal rod b409, and the position of the barb 4092 corresponds to the opening position of the insertion ring b4091. After the longitudinal rod b409 moves upward, the barb 4092 will hook into the insertion ring b4091, serving as a secondary safeguard to prevent the front and rear displacement of the interlocking mechanism 2.

[0022] Reference Figure 4 , the front guiding plate 202 is rotatably connected to a rotating clamping plate 6 through a fixed front steering sleeve b602. The rotating clamping plate 6 is rotatably connected to a front steering sleeve a601 fixed on the front guiding plate 202 through a rounded rectangular groove at one end. When the rotating clamping plate 6 rotates with the front steering sleeve b602 as the center, the front steering sleeve a601 can slide in the rounded rectangular groove; a clamping plate joint 603 perpendicular to the end face is provided at the other end of the rotating clamping plate 6. A groove is provided in the second half of the pull rod 701. The clamping plate joint 603 can be clamped in this groove after rotating to the horizontal state. At this time, the pull rod 701 on the cabinet door a101 cannot be separated from the interlocking mechanism 2, so the cabinet door a101 cannot be opened either.

[0023] A rotating rod mounting block 5 is installed on the cabinet wall 1. The rotating angle plate 501 is rotatably connected to the rotating rod mounting block 5 through a rear steering sleeve 503, and the rotating angle plate 501 rotates with the rear steering sleeve 503 as the rotation center. When the rotating angle plate 501 rotates counterclockwise, it will contact the bottom of the limit baffle 502 and then push the rear push rod 203 forward. An arc groove is provided at one end of the rotating angle plate 501 where the rear steering sleeve 504 is located. The rear steering sleeve 504 is clamped in this circular arc groove and can also slide when the rotating angle plate 501 rotates.

[0024] In the present invention, the steering sleeves as shown in the drawings are all connected to related components by clamping at both ends. The steering sleeves themselves can rotate freely, and the connected components can also rotate through the steering sleeves.

[0025] The vacuum circuit breaker 3 further includes a built-in circuit breaker main shaft 307, and an end plate 308 is fixed to the side of the circuit breaker main shaft 307. The circuit breaker main shaft 307 and the vertical longitudinal rod d309 form a crank and connecting rod transmission mechanism through the end plate 308, and the longitudinal rod d309 extends downward through a through hole in the bottom plate of the vacuum circuit breaker 3.

[0026] A movable block 304 is fixed to the top of the longitudinal rod c305. The movable block 304 is rotatably connected to the upper cam plate 303 through a transverse arc-shaped slot hole at its top. The cam plate 303 is located at the side end of the jogging shaft 302 built in the vacuum circuit breaker 3. At the other end of the jogging shaft 302, a retaining piece 301 is fixed along its radial direction. The retaining piece 301 can collide with the built-in switch button for opening and closing states. The switch button and the three-position switch are common manual buttons in the prior art, so they are not shown.

[0027] Reference Figure 6 , the three-position switch 4 further includes a built-in auxiliary switch drive shaft 401. The auxiliary switch drive shaft 401 is a common position switching component in the prior art. A drive block 402 is fixed along the radial direction of the auxiliary switch drive shaft 401. The drive block 402 abuts against the side roller 403. The roller 403 is rotatably fixed on the transverse drive rod 404 of the three-position switch 4. The transverse drive rod 404 can only move left and right, and the other end thereof is rotatably connected to the inclined oblique position drive rod 405 through a rotating shaft. The other end of the oblique position drive rod 405 is rotatably connected to the longitudinal rod a407 through a sliding card shaft 406. The bottom of the longitudinal rod a407 is fixedly connected to the longitudinal rod b409 through a longitudinal connecting block 408. The oblique position drive rod 405 can rotate and move up and down with the sliding card shaft 406 as the center;

[0028] A limit plate a4041 is also installed in the three-position switch 4. The limit plate a4041 is formed by splicing multiple layers of sheet metal and is provided with transverse through holes. The transverse drive rod 404 passes through the transverse through holes on the limit plate a4041 to limit it; A limit plate b4061 is also installed in the three-position switch 4, and the sliding card shaft 406 is clamped in the slot hole of the limit plate b4061; A plurality of longitudinal limit plates 306 are installed on the inner side of the cabinet wall 1. The longitudinal limit plates 306 are in a right-angled shape and are provided with downward through holes. Both the longitudinal rod c305 and the longitudinal rod b409 pass through the longitudinal limit plates 306 corresponding to their positions to ensure that they can only move up and down.

[0029] A spring support is fixed on the transverse transmission rod 404. A spring 411 is installed between the spring support and the limit plate a4041, and a tension spring 410 is installed between the longitudinal connection block 408 and the limit plate b4061. Both the spring 411 and the tension spring 410 can reset the longitudinal rod b409 upward.

[0030] A front guiding ring 206 is further provided on the front guiding plate 202. The front guiding ring 206 is located behind the front steering sleeve b602 and is always penetrated by the front push rod 205. A clamping block 3091 capable of passing through the opening of the insertion ring a3092 is installed at the bottom of the longitudinal rod 309. The barb 4092 can pass through the insertion ring b4091 to insert and connect the two.

[0031] The working principle of the present invention is as follows: (1) Refer to Figure 4 , when the cabinet door 101 is in the closed state and cannot be opened, the interlocking mechanism 2 is in the locked state; Rotate the angle plate 501 clockwise to the extreme. The longitudinal rod c305 moves upward, the cam plate 303 rotates, the disconnector switch is activated, the rear push rod 203 and the front push rod 205 are at the rearmost end, and the rotating clamping plate 6 is clamped with the pull rod 701. The vacuum circuit breaker 3 is in the open state, and the longitudinal rod d309 moves downward and extends into the insertion ring a3092; The three-position switch 4 is in the open state of the non-grounded state. The longitudinal rod b409 moves upward, and the barb 4092 extends into the insertion ring b4091; (2) Refer to Figure 8 , when the cabinet door 101 needs to be opened or is in the open state, the interlocking mechanism 2 needs to be in the unlocked state; The vacuum circuit breaker 3 needs to be adjusted to (be in) the closed state, that is, the longitudinal rod d309 moves upward and extends out of the insertion ring a3092; The three-position switch 4 is in the closed state of the grounded state, that is, the longitudinal rod b409 moves downward, and the barb 4092 extends out of the insertion ring b4091; Since the vacuum circuit breaker 3 is in the closed state, its internal components (conventional technology) will cause the longitudinal rod c305 to move downward, the angle plate 501 rotates counterclockwise, the cam plate 303 rotates in the reverse direction, the disconnector switch is closed, the rear push rod 203 and the front push rod 205 move forward and are at the foremost end. During the movement, the rotating clamping plate 6 rotates counterclockwise, and the rotating clamping plate 6 is separated from the pull rod 701. At this time, the cabinet door a101 is unlocked and can be opened.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Any other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims

1. A door interlocking mechanism for an inflatable high-voltage switch cabinet, comprising a vacuum circuit breaker (3) and a three-position switch (4) installed in a cabinet door b (102), characterized in that: Inside the cabinet door a (101) located below the cabinet door b (102), an interlocking mechanism (2) is provided. The interlocking mechanism (2) is installed on the inner side of the cabinet wall (1). An emergency unlocking device (7) is fixed on the outer side of the cabinet door a (101), and the back of the emergency unlocking device (7) is fixedly connected to a pull rod (701) passing through the cabinet door a (101). The interlocking mechanism (2) includes a front guiding plate (202) and a rear guiding plate (201) respectively fixed on the cabinet wall (1) front and back. A front push rod (205) and a rear push rod (203) are respectively inserted through the front guiding plate (202) and the rear guiding plate (201), and the two are fixedly connected by a push rod connecting plate (204). A rotating clamping plate (6) that can be clamped with the pull rod (701) after rotation is installed on the front push rod (205). A limiting baffle (502) is welded to the bottom of the rear push rod (203), and an insertion ring a (3092) and an insertion ring b (4091) are fixed on the side of the rear push rod (203). The vacuum circuit breaker (3) further includes a longitudinal rod c (305) that can control the opening and closing states by moving up and down and a longitudinal rod d (309) that passively displays the opening and closing states. A driving block (505) is provided at the bottom end of the longitudinal rod c (305). The driving block (505) is rotatably connected to a right-angled rotating angle plate (501) through a rear steering sleeve (504). The other end of the rotating angle plate (501) can abut against the limiting baffle (502). The bottom of the longitudinal rod d (309) can pass through the insertion ring a (3092) fixed on the side of the rear push rod (203). The three-position switch (4) includes a vertical longitudinal rod b (409) on its side. A barb (4092) is installed at the bottom of the longitudinal rod b (409), and the position of the barb (4092) corresponds to the position of the opening of the insertion ring b (4091).

2. The door interlock mechanism applied to the inflatable high-voltage switch cabinet according to claim 1, characterized in that: The front guiding plate (202) is rotatably connected to the rotating clamping plate (6) through a fixed front steering sleeve b (602). The rotating clamping plate (6) is rotatably connected to a front steering sleeve a (601) fixed on the front guiding plate (202) through a rounded rectangular groove at one end. When the rotating clamping plate (6) rotates with the front steering sleeve b (602) as the center, the front steering sleeve a (601) can slide in the rounded rectangular groove. The other end of the rotating clamping plate (6) is provided with a clamping plate joint (603) perpendicular to the end face. A groove is provided in the second half of the pull rod (701), and the clamping plate joint (603) can be clamped in this groove after rotating to the horizontal state.

3. The door interlocking mechanism applied to the inflatable high-voltage switch cabinet according to claim 1, characterized in that: A rotating rod mounting block (5) is installed on the cabinet wall (1). The rotating angle plate (501) is rotatably connected to the rotating rod mounting block (5) through a rear steering sleeve (503), and the rotating angle plate (501) rotates with the rear steering sleeve (503) as the rotation center. When the rotating angle plate (501) rotates counterclockwise, it will contact the bottom of the limiting baffle (502) and then push the rear push rod (203) to move forward. The rotating angle plate (501) is provided with an arc groove at one end of the rear steering sleeve (504). The rear steering sleeve (504) is clamped in this circular ring groove and can also slide when the rotating angle plate (501) rotates.

4. The door interlock mechanism applied to the inflatable high-voltage switch cabinet according to claim 1, characterized in that: The vacuum circuit breaker (3) further includes a built-in circuit breaker main shaft (307), and an end plate (308) is fixed to the side of the circuit breaker main shaft (307). The circuit breaker main shaft (307) and the vertical longitudinal rod d (309) form a crank and connecting rod transmission mechanism through the end plate (308), and the longitudinal rod d (309) extends downward through a through hole in the bottom plate of the vacuum circuit breaker (3).

5. The door interlocking mechanism applied to the inflatable high-voltage switch cabinet according to claim 4, wherein: A movable block (304) is fixed to the top of the longitudinal rod c (305). The movable block (304) is rotatably connected to the upper cam plate (303) through a transverse arc slot hole at its top. The cam plate (303) is located at the side end of the jogging shaft (302) built in the vacuum circuit breaker (3). A stop piece (301) is fixed to the other end of the jogging shaft (302) along its radial direction, and the stop piece (301) can collide with the built-in switch button in the opening state.

6. The door interlock mechanism applied to the inflatable high-voltage switch cabinet according to claim 1, characterized in that: The three-position switch (4) further includes an auxiliary switch drive shaft (401) built therein. A drive block (402) is fixed to the auxiliary switch drive shaft (401) along its radial direction. The drive block (402) abuts against a roller (403) on the side. The roller (403) is rotatably fixed on the transverse drive rod (404) of the three-position switch (4). The transverse drive rod (404) can only move left and right, and the other end thereof is rotatably connected to an inclined oblique drive rod (405) through a rotating shaft. The other end of the oblique drive rod (405) is rotatably connected to the longitudinal rod a (407) through a sliding card shaft (406). The bottom of the longitudinal rod a (407) is fixedly connected to the longitudinal rod b (409) through a longitudinal connecting block (408). The oblique drive rod (405) can rotate and move up and down with the sliding card shaft (406) as the center.

7. The door interlock mechanism applied to the gas-insulated high-voltage switchgear according to claim 6, characterized in that: A limit plate a (4041) is also installed in the three-position switch (4). The limit plate a (4041) is formed by splicing multiple layers of sheet metal and is provided with transverse through holes. The transverse drive rod (404) passes through the transverse through holes on the limit plate a (4041). A limit plate b (4061) is also installed in the three-position switch (4), and the sliding card shaft (406) is clamped in the slot hole of the limit plate b (4061). Several longitudinal limit plates (306) are installed on the inner side of the cabinet wall (1). The longitudinal limit plates (306) are right-angled and are all provided with downward through holes. Both the longitudinal rod c (305) and the longitudinal rod b (409) pass through the longitudinal limit plates (306) corresponding to their positions.

8. The door interlock mechanism applied to the inflatable high-voltage switch cabinet according to claim 7, characterized in that: A spring support is fixed on the transverse transmission rod (404). A spring (411) is installed between the spring support and the limit plate a (4041). A tension spring (410) is installed between the longitudinal connection block (408) and the limit plate b (4061). Both the spring (411) and the tension spring (410) can reset the longitudinal rod b (409) upward.

9. The door interlock mechanism applied to the inflatable high-voltage switch cabinet according to claim 1, characterized in that: A front guide ring (206) is further provided on the front guide plate (202). The front guide ring (206) is located behind the front steering sleeve b (602) and is always penetrated by the front push rod (205). A clamping block (3091) capable of passing through the opening of the insertion ring a (3092) is installed at the bottom of the longitudinal rod (309). The barb (4092) can pass through the insertion ring b (4091) to insert the two.

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