Support assembly for gas-insulated metal-enclosed switchgear

Abstract

The invention belongs to the technical field of switch equipment, and particularly relates to a supporting assembly for gas-insulated metal-enclosed switch equipment, which comprises a hexagonal sealing box, three circuit breakers are arranged in the sealing box, the three circuit breakers are respectively connected with three buses, and the three circuit breakers are respectively provided with a magnetic quenching mechanism. The upper end face of the sealing box communicates with an arc discharging channel, a gate plate driving mechanism is arranged in the arc discharging channel and comprises a sealing gate plate horizontally penetrating through the right wall of the arc discharging channel, and the sealing gate plate is in sealed sliding connection with the front inner wall and the rear inner wall of the arc discharging channel. The arc extinguishing device has the advantages that when an arcing fault occurs, arc extinguishing can be effectively carried out, an arc discharge channel can be rapidly opened, gas after arc extinguishing in the sealing box is rapidly discharged in cooperation with high-voltage and dry air, box body explosion accidents are effectively avoided, and the equipment safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of switchgear, and in particular to a support assembly for a gas-insulated metal-enclosed switchgear. Background Art

[0002] Gas-insulated metal-enclosed switchgear is a high-voltage electrical equipment used in the transmission, transformation and distribution links of power systems. It uses SF6, N2 or mixed gases as insulation and arc extinguishing media. It has the characteristics of compact structure, high reliability and strong environmental adaptability. It is widely used in urban power grids, substations and special environments.

[0003] Currently, although SF6 gas is used as the arc extinguishing medium in gas-insulated metal-enclosed switchgear, which has a good arc extinguishing effect, SF6 is not an environmentally friendly gas and requires frequent maintenance of gas containers. If a gas leakage accident occurs, it will not only affect the environment, but will also directly cause the arc extinguishing function in the switchgear to fail, resulting in arcing faults, and then cause the risk of cabinet explosion.

[0004] In order to solve the above problems, we propose a support assembly for gas-insulated metal-enclosed switchgear. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems in the background technology and to propose a support assembly for a gas-insulated metal-enclosed switchgear.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a support assembly for gas-insulated metal-enclosed switchgear, comprising a hexagonal sealed box, wherein three circuit breakers are installed in the sealed box, the three circuit breakers being connected to three busbars respectively, and each of the three circuit breakers being provided with a magnetic blow-out arc extinguishing mechanism; an arc discharge channel being communicated with from the upper end surface of the sealed box, wherein a gate drive mechanism is provided in the arc discharge channel, the gate drive mechanism comprising a sealed gate extending horizontally through the right wall of the arc discharge channel, the sealed gate being in sealed sliding connection with the front and rear inner walls of the arc discharge channel; The lower end of the sealed box is connected to an air intake channel, a gas storage tank is installed on one side of the air intake channel, a solenoid valve is installed between the air outlet end of the gas storage tank and the air intake channel, an arc sensor is installed on the sealed box, and support rods are fixedly connected to the four end faces of the sealed box on both sides.

[0007] In the above-mentioned support assembly for gas-insulated metal-enclosed switchgear, the magnetic blow-out arc extinguishing mechanism includes an arc chute located above the circuit breaker, the arc chute is composed of a plurality of parallel and equally spaced metal grids, the arc chute is fixed between the front and rear inner walls of the sealing box by two ceramic rods, and magnetic conductive plates are provided on the left and right sides of the circuit breaker, and the two magnetic conductive plates are arranged in parallel and fixed between the front and rear inner walls of the sealing box. A magnetic blow-out coil is connected in series on the circuit breaker, and a magnetic blow-out iron core is passed through the center of the magnetic blow-out coil, and the two ends of the magnetic blow-out iron core are respectively connected to the two magnetic conductive plates.

[0008] In the above-mentioned support assembly for gas-insulated metal-enclosed switchgear, the gate drive mechanism also includes a slide groove opened on the front and rear inner walls of the arc discharge channel and corresponding to the position of the sealing gate, and positioning holes are opened in the two slide grooves. The sealing gate is provided with a telescopic groove corresponding to the front and rear positions of the two positioning holes, and the front and rear ends of the telescopic groove are slidably connected with sliders matching the slide groove. Two fixed plates spaced apart in front and back are fixedly connected in the telescopic groove, and a first spring is fixedly connected between the two fixed plates and the corresponding sliders respectively, and the two sliders are away from the first spring. One end of the spring is slidably inserted with a positioning rod matching the positioning hole, and the second spring is fixedly connected between the positioning rod and the inner wall of the slider. One end of the slider is located in the telescopic slot and is fixedly connected to a movable rod. The ends of the two movable rods away from the slider pass through the corresponding fixed plate and are slidably connected thereto. A movable groove is provided on the right inner wall of the telescopic slot and between the two fixed plates. A movable block is slidably connected in the movable groove, and the left end of the movable block is triangular and extends to the position between the two fixed plates. The opposite ends of the two movable rods are respectively in contact with the two inclined surfaces on the left end of the movable block.

[0009] In the above-mentioned support assembly for gas-insulated metal-enclosed switchgear, the gate drive mechanism also includes a limit groove opened at the upper end of the moving block, a limit rod is movably inserted into the upper end of the sealing gate, the lower end of the limit rod extends to the moving groove and is inserted into the limit groove, a third spring is fixedly connected between the moving block and the right inner wall of the moving groove, a push rod is fixedly connected to the right end of the moving block, the push rod passes through the right inner wall of the moving groove and extends to the outside of the sealing gate, two sliding rods are fixedly connected to the right end of the arc discharge channel, the right ends of the two sliding rods are commonly fixedly connected to the end plate, the two sliding rods are slidably sleeved with sleeves, the two sleeves are fixedly connected to the right end of the sealing gate, and the two sleeves are fixedly connected to the end plate with a fourth spring.

[0010] In the above-mentioned support assembly for gas-insulated metal-enclosed switchgear, the gate drive mechanism also includes a trigger assembly, which includes two piston cylinders that penetrate the sealing gate and are fixedly connected thereto, a piston plate is sealingly and slidingly connected inside the piston cylinder, and a lifting rod is fixedly connected to the upper end of the piston plate. The upper ends of the two lifting rods extend above the sealing gate and are fixedly connected to a connecting plate together with the limiting rod, a fixing ring is fixedly connected to the upper end of the piston cylinder, and a fifth spring is fixedly connected between the fixing ring and the corresponding piston plate.

[0011] In the above-mentioned support assembly for gas-insulated metal-enclosed switchgear, a telescopic cylinder is fixedly mounted on the sealing box, and a push block is fixedly connected to the telescopic end of the telescopic cylinder. The push block passes through the end plate and corresponds to the position of the push rod.

[0012] Compared with the existing technology, the advantages of the present invention are: By setting up three magnetic arc extinguishing mechanisms, the arcs formed on the three circuit breakers are effectively extinguished by utilizing the driving effect of the magnetic field on the arc and the elongation and cooling effect of the arc chute on the arc, and the arc extinguishing will not affect the adjacent circuit breakers.

[0013] By setting up an arc discharge channel and a gate drive mechanism, when an arcing fault occurs in the sealed box, the gate drive mechanism can automatically drive the sealing gate to move, thereby opening the arc discharge channel for pressure relief, avoiding the occurrence of sealed box explosion accidents, and the gate drive mechanism can respond only by increasing the air pressure in the sealed box, and the response speed is fast.

[0014] By setting up an air intake channel and an air storage tank, high-pressure and dry air is stored in the air storage tank. When the arc light intensity in the sealed box exceeds the threshold value, the arc sensor transmits the signal to the main control unit through the optical fiber, thereby controlling the solenoid valve to open, so that the high-pressure air in the air storage tank is quickly filled into the sealed box through the air intake pipe, thereby cooperating with the arc discharge channel to quickly discharge the high-temperature air and arc light from the sealed box, and cool the sealed box, completely eliminating the arcing phenomenon and ensuring the safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A perspective view of a support assembly for a gas-insulated metal-enclosed switchgear according to the present invention; Figure 2 A perspective view of the support assembly for a gas-insulated metal-enclosed switchgear according to the present invention from another perspective; Figure 3 This is a schematic diagram of the internal structure of the sealing box in the support assembly of the gas-insulated metal-enclosed switchgear proposed by the present invention; Figure 4 A perspective view of a magnetic blowout arc extinguishing mechanism in a support assembly for a gas-insulated metal-enclosed switchgear proposed by the present invention; Figure 5 A perspective view of the magnetic blowout arc extinguishing mechanism in the support assembly of the gas-insulated metal-enclosed switchgear proposed by the present invention from another perspective; Figure 6 A perspective view of an arc discharge channel in a support assembly for a gas-insulated metal-enclosed switchgear proposed by the present invention; Figure 7 A cross-sectional view of an arc discharge channel in a support assembly for a gas-insulated metal-enclosed switchgear proposed by the present invention; Figure 8 A perspective view of a shutter drive mechanism in a support assembly for a gas-insulated metal-enclosed switchgear proposed by the present invention; Figure 9 A perspective view of a sealing gate in a support assembly for a gas-insulated metal-enclosed switchgear proposed by the present invention; Figure 10 A cross-sectional view of a sealing gate in a support assembly for a gas-insulated metal-enclosed switchgear proposed by the present invention; Figure 11 This is a partial cross-sectional view of a trigger assembly in a support assembly for a gas-insulated metal-enclosed switchgear proposed by the present invention.

[0016] In the figure: 1 sealing box, 2 circuit breaker, 3 busbar, 4 arc chute, 5 ceramic rod, 6 magnetic plate, 7 magnetic blow coil, 8 arc discharge channel, 9 sealing gate, 10 slide groove, 11 positioning hole, 12 telescopic through groove, 13 slider, 14 fixed plate, 15 first spring, 16 positioning plug rod, 17 second spring, 18 movable rod, 19 moving groove, 20 moving block, 21 third spring, 22 limiting groove, 23 limiting plug rod, 24 push rod, 25 slide rod, 26 end plate, 27 sleeve block, 28 fourth spring, 29 piston cylinder, 30 piston plate, 31 lifting rod, 32 connecting plate, 33 fixing ring, 34 fifth spring, 35 telescopic cylinder, 36 push block, 37 air inlet channel, 38 gas tank, 39 arc sensor. DETAILED DESCRIPTION

[0017] The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0018] Reference Figures 1-11 , a support assembly for gas-insulated metal-enclosed switchgear, including a hexagonal sealing box 1, three circuit breakers 2 are installed in the sealing box 1, and the three circuit breakers are respectively connected to three busbars 3. The sealing box 1 is located in the switch cabinet and is used to protect the circuit breaker, and the sealing box 1 is filled with dry air as an insulating medium to protect the circuit breaker 2.

[0019] The three circuit breakers 2 are all equipped with a magnetic blow-out arc extinguishing mechanism. The three busbars 3 are the three live wires in the three-phase circuit. Due to the phase difference of the three-phase current, the arc intensity, duration and extinguishing time of the three phase lines will not be completely synchronized. Therefore, the three magnetic blow-out arc extinguishing mechanisms can effectively extinguish the arcs of the three lines, and the three circuit breakers 2 are set separately, so that the arc extinguishing will not affect the adjacent circuit breakers 2.

[0020] The magnetic blowout arc extinguishing mechanism includes an arc chute 4 located above the circuit breaker 2. The arc chute 4 is composed of multiple parallel and evenly spaced metal grids. The arc chute 4 is fixed between the front and rear inner walls of the sealed box 1 through two ceramic rods 5. Magnetic conductive plates 6 are provided on the left and right sides of the circuit breaker. The two magnetic conductive plates 6 are arranged in parallel and fixed between the front and rear inner walls of the sealed box 1. A magnetic blowout coil 7 is connected in series on the circuit breaker 2. A magnetic blowout iron core passes through the center of the magnetic blowout coil 7, and the two ends of the magnetic blowout iron core are respectively connected to the two magnetic conductive plates 6. Specifically, the magnetic blow coil 7 is connected in series in the contact circuit. The current passing through the magnetic blow coil 7 is the arc current. This current generates magnetic flux, which forms a loop through the magnetic blow core and the magnetic conductive plate 6. This creates a magnetic field between the two magnetic conductive plates 6. This magnetic field effectively covers the contact space between the circuit breaker 2. Subsequently, when an arc is generated between the contacts of the circuit breaker 2, the arc is forced upward in the magnetic field, thereby elongating the arc and forcing it into the arc chute 4. The arc chute 4 divides the arc into multiple short arcs that burn between the metal grids. The near-pole effect increases the total arc voltage drop, thereby forcing the arc current to decrease. Heat conduction through the metal grids enhances the arc cooling effect, further accelerating the arc extinction speed.

[0021] The upper end surface of the sealed box 1 is connected to an arc discharge channel 8, which is used to promptly discharge high-temperature, high-pressure gas and arc light from the sealed box 1 in the event of an arcing fault, thereby preventing explosion accidents. A gate drive mechanism is installed within the arc discharge channel 8. The gate drive mechanism includes a sealing gate 9 that extends horizontally through the right wall of the arc discharge channel 8. The sealing gate 9 is in sealing and sliding connection with the front and rear inner walls of the arc discharge channel 8. The sealing gate 9 is used to seal the arc discharge channel 8 and ensure the sealing of the sealed box 1 when pressure relief is not required.

[0022] The gate drive mechanism also includes a chute 10 formed on the front and rear inner walls of the arc vent channel 8 and corresponding to the position of the sealing gate 9. Each chute 10 has a corresponding positioning hole 11. The sealing gate 9 has a telescopic slot 12 formed on the front and rear ends of the telescopic slot 12, which is slidably connected to a slider 13 that matches the chute 10 and can slide within the chute 10. Two fixed plates 14, spaced apart from each other, are fixedly connected within the telescopic slot 12. A first spring 15 is fixedly connected between each of the fixed plates 14 and the corresponding slider 13. A positioning rod 16 that matches the positioning hole 11 is slidably inserted into the end of each slider 13 that is away from the first spring 15. A second spring 17 is fixedly connected between the positioning rod 16 and the inner wall of the slider 13. The second spring 17 is a compression spring. When not under external force, the positioning rod 16 is always extended from the slider 13. The first spring 15 is a tension spring. When not under force, the ends of the slider 13 and the positioning rod 16 are both located within the chute 10. Specifically, when the positioning rod 16 is located in the slide groove 10, the sealing gate plate 9 can move laterally, that is, the sealing gate plate 9 can be moved to the right to open the arc discharge channel 8, and when the positioning rod 16 is in the state of being inserted into the positioning hole 11, the sealing gate plate 9 cannot move and remains in the state of blocking the arc discharge channel 8.

[0023] One end of the slider 13 located in the telescopic slot 12 is fixedly connected to a movable rod 18, and the ends of the two movable rods 18 away from the slider 13 both pass through the corresponding fixed plate 14 and are slidably connected thereto. A movable groove 19 is provided on the right inner wall of the telescopic slot 12 and between the two fixed plates 14. A movable block 20 is slidably connected in the movable groove 19. The left end of the movable block 20 is triangular and extends to the position between the two fixed plates 14. The opposite ends of the two movable rods 18 are in contact with the two inclined surfaces on the left end of the movable block 20 respectively. The setting of the movable block 20 and the movable rod 18 plays a role in controlling the movement of the slider 13. When the left end of the movable block 20 is completely in the telescopic slot 12, the distance between the two movable rods 18 is the farthest. In this state, the two first springs 15 are both in a stretched state, and the two sliders 13 move to the innermost part of the slide slot 10. At this time, the positioning rod 16 can be inserted into the corresponding positioning hole 11. When the moving block 20 is completely in the moving groove 19 , the distance between the two movable rods 18 is closest, the first spring 15 is in the initial state, and the positioning rod 16 cannot be inserted into the positioning hole 11 .

[0024] The gate drive mechanism also includes a limit slot 22 formed at the upper end of the movable block 20. A limit rod 23 is movably inserted into the upper end of the sealing gate 9. The lower end of the limit rod 23 extends to the movable slot 19 and is inserted into the limit slot 22. The limit slot 22 and the limit rod 23 act to limit the movable block 20. When the limit rod 23 is inserted into the limit slot 22, the left end of the movable block 20 is located within the telescopic groove 12. At this time, the sealing gate 9 can be locked within the arc discharge channel 8 to ensure the sealing of the sealing box 1. A third spring 21 is fixedly connected between the movable block 20 and the right inner wall of the movable slot 19. The third spring 21 is a tension spring. When the sealing gate 9 is locked, the third spring 21 is in a tensioned state. A push rod 24 is fixedly connected to the right end of the movable block 20. The push rod 24 passes through the right inner wall of the movable slot and extends to the outside of the sealing gate 9 to push the movable block 20.

[0025] Two sliding rods 25 are fixedly connected to the right end of the arc discharge channel 8, and the right ends of the two sliding rods 25 are commonly fixedly connected to an end plate 26. A sleeve block 27 is slidably sleeved on the two sliding rods 25, and the two sleeve blocks 27 are fixedly connected to the right end of the sealing gate plate 9. A fourth spring 28 is fixedly connected between the two sleeve blocks 27 and the end plate 26. The fourth spring 28 is a tension spring. When the sealing gate plate 9 is in a locked state, the fourth spring 28 is in a tension state.

[0026] The gate drive mechanism also includes a trigger assembly, which includes two piston cylinders 29 that penetrate the sealing gate plate 9 and are fixedly connected thereto. A piston plate 30 is sealingly and slidably connected within the piston cylinder 29. A lifting rod 31 is fixedly connected to the upper end of the piston plate 30. The upper ends of the two lifting rods 31 extend above the sealing gate plate 9 and are fixedly connected to a connecting plate 32 together with the limit rod 23. The lifting of the piston plate 30 can drive the limit rod 23 to rise and fall. A fixing ring 33 is fixedly connected to the upper end of the piston cylinder 29. The lifting rod 31 is set through the fixing ring 33. A fifth spring 34 is fixedly connected between the fixing ring 33 and the corresponding piston plate 30. The fifth spring 34 is a compression spring. Under normal conditions, the piston plate 30 and the limit rod 23 are both in the lowest position, and the limit rod 23 can remain inserted into the limit groove 22.

[0027] Specifically, when an arcing fault occurs in the sealing box 1, the temperature and air pressure in the sealing box 1 rise rapidly. Under high pressure, the gas in the sealing box 1 can push the two piston plates 30 upward, compressing the fifth spring 34, forcing the limit rod 23 to move upward and out of the limit groove 22. At this time, the moving block 20 is released from the limit and moves to the right under the pull of the third spring 21, so that the left end of the moving block 20 moves into the moving groove 19. Then, the two sliders 13 move toward the telescopic groove 12 under the pull of the first spring 15, so that the two positioning rods 16 move out of the positioning hole 11 at the same time, thereby releasing the lock on the sealing gate 9. After the sealing gate 9 is unlocked, it can be pulled to the right by the two fourth springs 28, thereby opening the arc discharge channel 8 and performing pressure relief work.

[0028] The lower end of the sealed box 1 is connected to an air inlet channel 37. An air tank 38 is installed on one side of the air inlet channel 37 to store dry, high-pressure air, which is regularly replenished using an air compressor. A solenoid valve is installed between the outlet of the air tank 38 and the air inlet channel 37. An arc sensor 39 is installed on the sealed box 1. The arc sensor 39 is a conventional technology. When it detects that the light intensity exceeds a threshold, it transmits a signal to the main control unit via optical fiber, thereby controlling the solenoid valve to open, allowing the high-pressure air in the air tank 38 to be quickly filled into the sealed box 1 through the air inlet pipe 37. This facilitates the rapid discharge of high-temperature air and arc light from the sealed box 1 in conjunction with the arc discharge channel 8, and cools the sealed box 1, completely eliminating arcing.

[0029] It should be noted that when an arc fault occurs, the magnetic arc extinguishing mechanism can still perform effective arc extinguishing work, and combined with the high-speed flow of air entering the sealing box 1, it can further promote the elimination of the arc. After the arc is extinguished, the metal particles in the air can be effectively discharged with the air through the arc discharge channel 8, ensuring the arc extinguishing effect.

[0030] A telescopic cylinder 35 is fixedly mounted on the sealing box 1 , and a push block 36 is fixedly connected to the telescopic end of the telescopic cylinder 35 . The push block 36 passes through the end plate 26 and corresponds to the position of the push rod 24 . Furthermore, when the arc extinguishing and pressure relief operations are complete and no arc is generated within the sealed box 1, the solenoid valve closes, stopping the delivery of dry air. Simultaneously, the telescopic cylinder 35 drives the push block 36 to move leftward, contacting and pushing the push rod 24 to the left, causing the movable block 20 to move leftward, stretching the third spring 21 until the limit rod 23 moves from the upper end of the movable block 20 to the limit groove 22. Thereby, under the action of the fifth spring 34, it is reinserted into the limit groove 22. Simultaneously, the slider 13 can be pushed outward of the telescopic slot 12 by the movable rod 18, causing the positioning rod 16 to be retracted into the slider 13. At this point, the push block 36 can directly push the sealing gate 9 to the left, stretching the fourth spring 28 until the arc discharge channel 9 is completely closed. At this point, both positioning rods 16 are inserted into the corresponding positioning holes 11 under the action of the second spring 17, completing the locking of the sealing gate 9. Through the above arrangement, the gate drive mechanism can continue to effectively respond when arcing occurs again within the sealed box 1.

[0031] The four end faces of the sealing box 1 on both sides are fixedly connected with support rods, which are fixed to the switch cabinet together with the arc discharge channel 8 and the air intake channel 37, playing an effective supporting and fixing role to ensure the stability of the sealing box 1 and its internal components.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A support assembly for a gas-insulated metal-enclosed switchgear, comprising a hexagonal sealing box (1), characterized in that: Three circuit breakers (2) are installed in the sealed box (1), and the three circuit breakers are respectively connected to three busbars (3). The three circuit breakers (2) are all provided with a magnetic blow-out arc mechanism. The upper end surface of the sealed box (1) is connected to an arc discharge channel (8), and a gate drive mechanism is provided in the arc discharge channel (8). The gate drive mechanism includes a sealed gate (9) horizontally penetrating the right wall of the arc discharge channel (8), and the sealed gate (9) is in sealed sliding connection with the front and rear inner walls of the arc discharge channel (8); The lower end of the sealed box (1) is connected to an air inlet channel (37), a gas storage tank (38) is installed on one side of the air inlet channel (37), a solenoid valve is installed between the air outlet end of the gas storage tank (38) and the air inlet channel (37), an arc sensor (39) is installed on the sealed box (1), and support rods are fixedly connected to the four end faces on both sides of the sealed box (1).

2. The support assembly for gas-insulated metal-enclosed switchgear according to claim 1, characterized in that: The magnetic blowout arc extinguishing mechanism includes an arc chute (4) located above the circuit breaker (2), the arc chute (4) is composed of a plurality of parallel and equally spaced metal grids, the arc chute (4) is fixed between the front and rear inner walls of the sealed box (1) through two ceramic rods (5), and magnetic conductive plates (6) are provided on both the left and right sides of the circuit breaker, the two magnetic conductive plates (6) are arranged in parallel and fixed between the front and rear inner walls of the sealed box (1), a magnetic blowout coil (7) is connected in series on the circuit breaker (2), a magnetic blowout iron core is passed through the center of the magnetic blowout coil (7), and the two ends of the magnetic blowout iron core are respectively connected to the two magnetic conductive plates (6).

3. The support assembly for gas-insulated metal-enclosed switchgear according to claim 1, characterized in that: The gate drive mechanism also includes a slide groove (10) provided on the front and rear inner walls of the arc discharge channel (8) and corresponding to the position of the sealing gate (9), and a positioning hole (11) is provided in each of the two slide grooves (10). The sealing gate (9) is provided with a telescopic groove (12) corresponding to the front and rear positions of the two positioning holes (11). The front and rear ends of the telescopic groove (12) are slidably connected to a slider (13) matching the slide groove (10). Two fixed plates (14) spaced apart in front and back are fixedly connected in the telescopic groove (12). A first spring (15) is fixedly connected between the two fixed plates (14) and the corresponding sliders (13). The ends of the two sliders (13) away from the first spring (15) are slidably inserted with a slider corresponding to the positioning hole (11). A matching positioning rod (16) is provided, wherein a second spring (17) is fixedly connected between the positioning rod (16) and the inner wall of the slider (13); one end of the slider (13) located in the telescopic slot (12) is fixedly connected to a movable rod (18); the ends of the two movable rods (18) away from the slider (13) pass through the corresponding fixed plates (14) and are slidably connected thereto; a movable groove (19) is provided on the right inner wall of the telescopic slot (12) and between the two fixed plates (14); a movable block (20) is slidably connected in the movable groove (19); the left end of the movable block (20) is triangular and extends to the position between the two fixed plates (14); the opposite ends of the two movable rods (18) are in contact with the two inclined surfaces on the left end of the movable block (20).

4. The support assembly for gas-insulated metal-enclosed switchgear according to claim 3, characterized in that: The gate drive mechanism further includes a limit groove (22) provided at the upper end of the moving block (20), a limit rod (23) movably inserted at the upper end of the sealing gate (9), the lower end of the limit rod (23) extending to the moving groove (19) and inserted into the limit groove (22), a third spring (21) fixedly connected between the moving block (20) and the right inner wall of the moving groove (19), a push rod (24) fixedly connected to the right end of the moving block (20), the push rod (24) ) penetrates the right inner wall of the movable groove and extends to the outside of the sealing gate (9), the right end of the arc discharge channel (8) is fixedly connected to two sliding rods (25), the right ends of the two sliding rods (25) are commonly fixedly connected to the end plate (26), the two sliding rods (25) are slidably sleeved with sleeve blocks (27), the two sleeve blocks (27) are fixedly connected to the right end of the sealing gate (9), and the two sleeve blocks (27) are fixedly connected to the end plate (26), and a fourth spring (28) is fixedly connected between the two sleeve blocks (27) and the end plate (26).

5. The support assembly for gas-insulated metal-enclosed switchgear according to claim 4, characterized in that: The gate drive mechanism also includes a trigger assembly, which includes two piston cylinders (29) that penetrate the sealing gate (9) and are fixedly connected thereto, a piston plate (30) is sealingly and slidably connected inside the piston cylinder (29), and a lifting rod (31) is fixedly connected to the upper end of the piston plate (30), and the upper ends of the two lifting rods (31) extend above the sealing gate (9) and are fixedly connected to a connecting plate (32) together with the limiting plug rod (23), a fixing ring (33) is fixedly connected to the upper end of the piston cylinder (29), and a fifth spring (34) is fixedly connected between the fixing ring (33) and the corresponding piston plate (30).

6. The support assembly for gas-insulated metal-enclosed switchgear according to claim 1, characterized in that: A telescopic cylinder (35) is fixedly mounted on the sealing box (1), and a push block (36) is fixedly connected to the telescopic end of the telescopic cylinder (35). The push block (36) passes through the end plate (26) and corresponds to the position of the push rod (24).

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