Detachable zinc oxide lightning arrester

Abstract

The invention discloses a detachable zinc oxide lightning arrester, which belongs to the technical field of circuit protection equipment and comprises a supporting insulator, a cross arm is mounted at the top of the supporting insulator, a zinc oxide lightning arrester abuts against one end, far away from the supporting insulator, of the cross arm, a base is mounted at the bottom of the supporting insulator, and a separation mechanism is mounted at the bottom of the base. The separating mechanism comprises a limiting clamping groove, an adjusting assembly is installed on one side of the limiting clamping groove and rotationally connected with a limiting clamping block, a positioning shaft is fixedly connected to the base, a large tension spring is fixedly connected to the positioning shaft, the end, away from the positioning shaft, of the large tension spring is fixedly connected with the limiting clamping block, a supporting shaft is further fixedly connected to the base, and a limiting hook is rotationally connected to the supporting shaft. The limiting supporting face of the limiting hook abuts against the limiting clamping block. A separating box abuts against the interior of the limiting clamping groove. A worker uses the insulating rod to replace the zinc oxide lightning arrester on the ground, so that the maintenance workload is reduced, and the electric shock risk caused by close-range contact between the worker and the high-voltage line is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of circuit protection equipment, and particularly relates to a detachable zinc oxide lightning arrester. BACKGROUND

[0002] The zinc oxide lightning arrester is a lightning arrester with good protection performance. The zinc oxide lightning arrester has good nonlinear voltage-current characteristics, so that the current flowing through the lightning arrester is extremely small (microampere or milliamper level) at normal working voltage; when overvoltage acts, the resistance sharply decreases to discharge the energy of the overvoltage, so as to achieve the protection effect.

[0003] The existing zinc oxide lightning arrester is often used in cooperation with a thermal explosion disconnector. After being struck by lightning, the thermal explosion disconnector explodes to destroy the supporting point of the zinc oxide lightning arrester and make the zinc oxide lightning arrester disconnect the connection with the high-voltage line to isolate the circuit.

[0004] After the zinc oxide lightning arrester is damaged by overvoltage, the cross arm contact terminal is still connected with the power grid. When the new zinc oxide lightning arrester is replaced, the live working or line tripping power failure is needed, which causes trouble for the work of repairing and replacing the zinc oxide lightning arrester and delays the recovery time of the power grid.

[0005] The application aims to provide a detachable zinc oxide lightning arrester to solve the problems in the prior art. SUMMARY

[0006] To achieve the above-mentioned purpose, the application provides the following scheme: the application provides a detachable zinc oxide lightning arrester, which comprises a supporting insulator, the top of the supporting insulator is provided with a cross arm, the bottom of the end of the cross arm away from the supporting insulator is provided with a zinc oxide lightning arrester, the bottom of the supporting insulator is provided with a base, the bottom of the base is provided with a disconnection mechanism, the disconnection mechanism comprises a limiting clamping groove, the limiting clamping groove is fixedly connected with the base, one side of the limiting clamping groove is provided with an adjusting assembly, the adjusting assembly is rotationally connected with the base, the end of the adjusting assembly away from the limiting clamping groove is rotationally connected with a limiting clamping block, a positioning shaft is fixedly connected to the base, a large tension spring is fixedly connected to the positioning shaft, the end of the large tension spring away from the positioning shaft is fixedly connected with the limiting clamping block, a supporting shaft is also fixedly connected to the base, a limiting hook is rotationally connected to the supporting shaft, the limiting support surface of the limiting hook is in abutment with the limiting clamping block, and the hook body of the limiting hook is in abutment with the supporting leg of the zinc oxide lightning arrester; a disconnection box is in abutment with the limiting clamping groove, and the lead leg of the zinc oxide lightning arrester is electrically connected with the disconnection box.

[0007] Preferably, the bottom of the release chamber is provided with a support cylinder for supporting the internal structure. Telescopic compartments are symmetrically slidably connected to both ends of the release chamber. A support rod is rotatably connected to the side wall of each telescopic compartment. A leakage current protector is installed on the inner side of the top of the telescopic compartment. The movable end of the support rod abuts against the actuating lever of the leakage current protector. A small tension spring is installed below the support rod, with one end fixed to the side wall of the telescopic compartment and the other end fixed to the support cylinder. A diode is installed at the bottom of the telescopic compartment, with its output terminal electrically connected to the leakage current protector and its input terminal electrically connected to the lead wire.

[0008] Preferably, the top of the release box has a functional compartment, the bottom of the functional compartment is fixedly connected to an audible and visual alarm, an insulated magnet is placed above the audible and visual alarm, an insulating sheet is provided between the audible and visual alarm and the insulated magnet, a knob cover is detachably connected to the opening of the functional compartment, the knob cover has several ventilation holes, and a thin sponge is sandwiched between the knob cover and the insulated magnet.

[0009] Preferably, a second spring is fixedly connected to the side of the limiting slot away from the adjusting component, and a guide fixing plate is fixedly connected to the second spring. The bottom edge of the guide fixing plate is in contact with the inner wall of the limiting slot, and a first spring is installed on the top of the limiting slot near the second spring. The first spring abuts against the adjusting component.

[0010] Preferably, the bottom opening of the limiting slot is provided with a guide horn.

[0011] Preferably, the adjusting component includes a movable piece located within the limiting slot and abutting against the first spring. A support arm is fixedly connected to one end of the movable piece away from the first spring, and a movable arm is fixedly connected to the other end of the support arm. The two movable arms are arranged vertically and symmetrically. The support arm is fixedly connected to the movable arm located above it. The positioning shaft is located between the two movable arms. The movable arm includes a gear, and a fixed shaft is rotatably connected to the middle of the gear. The fixed shaft is fixedly connected to the base. First movable rods are fixedly connected to both sides of the gear. A second movable rod is rotatably connected to the other end of the first movable rod, and the other end of the second movable rod is rotatably connected to the limiting block.

[0012] Preferably, the hook body is provided with a support groove and a buffer groove, the support groove abuts against the support leg, and the buffer groove is used to prevent the zinc oxide surge arrester from falling out of the hook body.

[0013] Preferably, the base is equipped with a buffer protection frame and a support sliding frame at its bottom. The buffer protection frame is used to reduce the impact of the lead wire on the bracket when the zinc oxide surge arrester falls, and the support sliding frame is used to provide support for the limit block.

[0014] Preferably, the top and bottom surfaces of the limiting block are provided with lubricating oil grooves.

[0015] The present invention discloses the following technical effects: by having workers use an insulated rod to operate and replace zinc oxide surge arresters on the ground, the workload of maintenance is reduced and the risk of electric shock from close contact between workers and high-voltage lines is avoided. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the disengagement mechanism and the limiting hook of the present invention; Figure 3 This is a schematic diagram of the internal structure of the limiting slot of the present invention; Figure 4 This is a schematic diagram of the structure of the release box of the present invention; Figure 5 This is a schematic diagram of the structure of the present invention that allows it to detach from the inside of the box; Figure 6 This is a schematic diagram of the structure of the buffer protection frame, the supporting sliding frame, and the support frame of the present invention; In the diagram: 1. Supporting insulator; 2. Base; 3. Crossarm; 4. Zinc oxide surge arrester; 5. Lead pin; 6. Disengagement mechanism; 610. Limiting slot; 611. First spring; 612. Second spring; 613. Guide fixing plate; 620. Movable plate; 621. Support arm; 622. Fixed shaft; 623. Gear; 624. First movable rod; 625. Second movable rod; 626. Limiting block; 631. Positioning shaft; 632. Large tension spring; 641 642. Buffer protection frame; 643. Support sliding frame; 7. Support frame; 7. Limit hook; 701. Hook body; 7011. Support groove; 7012. Buffer groove; 702. Limit support surface; 703. Pull ring; 704. Support shaft; 8. Release box; 801. Telescopic compartment; 802. Knob cover; 803. Support cylinder; 9. Diode; 10. Insulating magnet; 11. Sound and light reminder; 12. Leakage protection device; 13. Support rotating rod; 14. Small tension spring. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Reference Figures 1-6As shown, this embodiment provides a detachable zinc oxide surge arrester 4, including a supporting insulator 1, a crossarm 3 mounted on the top of the supporting insulator 1, and the zinc oxide surge arrester 4 abutting at the bottom of the end of the crossarm 3 away from the supporting insulator 1. A base 2 is mounted on the bottom of the supporting insulator 1, and a disengagement mechanism 6 is mounted on the bottom of the base 2. The disengagement mechanism 6 includes a limiting slot 610, which is fixedly connected to the base 2. An adjustment component is mounted on one side of the limiting slot 610, and the adjustment component is rotatably connected to the base 2. The end of the adjustment component away from the limiting slot 610 is rotatably connected to a... A limiting block 626 is attached to a base 2, and a positioning shaft 631 is fixedly connected to the positioning shaft 631. A large tension spring 632 is fixedly connected to the positioning shaft 631, with one end of the large tension spring 632 away from the positioning shaft 631 fixedly connected to the limiting block 626. A support shaft 704 is also fixedly connected to the base 2, and a limiting hook 7 is rotatably connected to the support shaft 704. The limiting support surface 702 of the limiting hook 7 abuts against the limiting block 626, and the hook body 701 of the limiting hook 7 abuts against the support leg of the zinc oxide surge arrester 4. A release box 8 abuts against the limiting slot 610, and the release box 8 is electrically connected to the lead leg 5 of the zinc oxide surge arrester 4. A crossarm 3, which is detachably connected to the top of the supporting insulator 1 by bolts, provides a fixing function for the top of the zinc oxide surge arrester 4. The base 2 at the bottom of the supporting insulator 1 provides support for the release mechanism 6, and the release mechanism 6 provides support and fixing for the bottom of the zinc oxide surge arrester 4. In use, place the release box 8 on an insulating rod, and hang the zinc oxide surge arrester 4 on another insulating rod while simultaneously raising it to the installation position. First, insert the release box 8 into the limiting slot 610. During this process, the adjusting component pushes the limiting block 626 back to its original position, simultaneously tightening the large tension spring 632. At this point, the limiting support surface 702 of the limiting hook 7 contacts the bottom surface of the limiting block 626. Then, insert the support leg of the zinc oxide surge arrester 4 into the limiting hook 7. Finally, abut the top of the zinc oxide surge arrester 4 against the end of the crossarm 3 to complete the installation. When installing the zinc oxide surge arrester 4, workers only need to use the insulating rod on the ground to complete the entire installation. When the zinc oxide surge arrester 4 is struck by lightning, the release box 8 disengages from the limit slot 610. The large tension spring 632 pulls the limit block 626, which in turn pulls the adjusting component. At this point, the limit block 626 releases the restriction on the upper limit support surface 702 of the limit hook 7, and the limit hook 7 rotates clockwise. The legs of the zinc oxide surge arrester 4, lacking sufficient support, disengage from the crossarm 3, completing the circuit isolation action. When replacing the damaged zinc oxide surge arrester 4, workers only need to use an insulated rod on the ground to remove it from the limit hook 7. This method of replacing the zinc oxide surge arrester 4 on the ground reduces maintenance workload and avoids the risk of electric shock from close contact with high-voltage lines.

[0020] The design is further optimized by providing a support cylinder 803 at the bottom of the release box 8 to support the internal structure. Telescopic compartments 801 are symmetrically slidably connected to both ends of the release box 8. A support rod 13 is rotatably connected to the side wall of the telescopic compartment 801. A leakage current protector 12 is installed on the inner side of the top of the telescopic compartment 801. The movable end of the support rod 13 abuts against the actuation rod of the leakage current protector 12. A small tension spring 14 is installed below the support rod 13. One end of the small tension spring 14 is fixed to the side wall of the telescopic compartment 801, and the other end is fixed to the support cylinder 803. A diode 9 is installed at the bottom of the telescopic compartment 801. The output end of the diode 9 is electrically connected to the leakage current protector 12, and the input end of the diode 9 is electrically connected to the lead pin 5. The support cylinder 803 is connected to the outside, and the top of the insulating rod can directly extend into the support cylinder 803, facilitating installation without the box 8. When the zinc oxide surge arrester 4 is struck by lightning, the high-voltage current first enters the diode 9 along the metal wire on the lead 5. The diode 9 clamps the high-voltage current to within a safe voltage range, and then transmits it to the residual current device 12 through the insulated metal wire. After receiving the electrical signal, the residual current device 12 trips to release the restriction on the movable end of the support rod 13. The small tension spring 14 begins to pull the telescopic chamber 801 to retract, and the volume of the box 8 shrinks, allowing it to detach from the limiting slot 610, thereby separating the zinc oxide surge arrester 4 from the crossarm 3. In this application, the diode 9 is preferably a 600V TVS diode 9, and the corresponding number of TVS diodes 9 are connected in parallel and in series according to the breakdown voltage of the zinc oxide surge arrester 4 until the voltage and current are reduced to within the safe power-off threshold of the corresponding residual current device 12. During reset, check if the TVS diode 9 is working properly. If it is not working properly, it needs to be replaced promptly. If it is working properly, switch the leakage current protector 12 to the working position, and then place the movable end of the support rod 13 against the toggle lever of the leakage current protector 12. The material of the release box 8 is preferably transparent or semi-transparent flame-retardant plastic. Telescopic compartments 801 are provided on both sides of the release box 8. When a fault occurs in one telescopic compartment 801, the other telescopic compartment 801 can still retract the release box 8, allowing the release box 8 to disengage from the limit slot 610, thereby achieving circuit isolation of the zinc oxide surge arrester 4 and enhancing the reliability of the equipment.

[0021] The design is further optimized by opening a functional compartment at the top of the detachable box 8. A sound and light reminder 11 is fixedly connected to the bottom of the functional compartment. An insulated magnet 10 is placed above the sound and light reminder 11. An insulating sheet is provided between the sound and light reminder 11 and the insulated magnet 10. A knob cover 802 is detachably connected to the opening of the functional compartment. Several ventilation holes are provided on the knob cover 802. A thin sponge is sandwiched between the knob cover 802 and the insulated magnet 10. The sound and light alarm 11 has a built-in button battery and also includes a flashing LED light and a buzzer. An insulating sheet prevents the insulating magnet 10 from attracting the sound and light alarm 11. A metal piece on the side of the insulating sheet near the insulating magnet 10 is electrically connected to the positive terminal of the button battery, and a metal piece on the side of the insulating magnet 10 near the insulating sheet is connected to the negative terminal of the button battery. During transportation, the metal piece between the insulating magnet 10 and the insulating sheet is insulated. When installing the release box 8, the insulation between the metal piece between the insulating magnet 10 and the insulating sheet is released by opening the knob cover 802. At this time, the LED light and buzzer start working. During the process of placing the release box 8 into the limiting slot 610, the insulating magnet 10 attracts the adjusting component and compresses the thin sponge. When the release box 8 is removed from the limiting slot 610, the thin sponge pushes the insulating magnet 10, making the metal piece between the insulating magnet 10 and the insulating sheet connected, and the sound and light alarm 11 starts working. Regardless of whether the lighting is sufficient, the staff can promptly detect the detached zinc oxide surge arrester 4. After the release box 8 is released from the limit slot 610, since the bottom of the release box 8 is connected to the lead wire 5 by a metal wire, the bottom of the release box 8 is facing up and the top is facing down. At this time, the vent on the knob cover 802 will not allow rainwater to enter, thus ensuring the normal operation of the sound and light reminder 11.

[0022] In a further optimized design, a second spring 612 is fixedly attached to the side of the limiting slot 610 away from the adjusting component. A guide plate 613 is fixedly attached to the second spring 612, with its bottom edge fitting against the inner wall of the limiting slot 610. A first spring 611 is installed on the top side of the limiting slot 610 near the second spring 612, and it abuts against the adjusting component. The second spring 612 supports the fixing plate, and when the release box 8 is placed into the limiting slot 610, it can firmly restrain the release box 8 within the limiting slot 610. The stroke of the second spring 612 is less than the stroke of the telescopic chamber 801. When the release box 8 is released from the limiting slot 610, the first spring 611 can provide initial power for the movement of the adjusting component. During normal installation of the release box 8, the first spring 611 will not eject the release box 8 from the limiting slot 610. The elastic force of the first spring 611 can only provide initial power for the adjusting component when there is no release box 8 within the limiting slot 610.

[0023] The design has been further optimized by incorporating a guide horn at the bottom opening of the limiting slot 610. This guide horn allows workers to more accurately and quickly place the release box 8 into the limiting slot 610 during installation.

[0024] The scheme is further optimized. The adjustment component includes a movable piece 620, which is located in the limiting slot 610 and abuts against the first spring 611. A support arm 621 is fixedly connected to one end of the movable piece 620 away from the first spring 611, and a movable arm is fixedly connected to the other end of the support arm 621. The two movable arms are arranged vertically and symmetrically. The support arm 621 is fixedly connected to the movable arm located above. The positioning shaft 631 is located between the two movable arms. The movable arm includes a gear 623. A fixed shaft 622 is rotatably connected to the middle of the gear 623. The fixed shaft 622 is fixedly connected to the base 2. A first movable rod 624 is fixedly connected to both sides of the gear 623. A second movable rod 625 is rotatably connected to the other end of the first movable rod 624. The other end of the second movable rod 625 is rotatably connected to the limiting block 626. The movable piece 620 is a metal sheet that can be attracted by a magnet. When the release box 8 is released from the limiting slot 610, the first spring 611 pops the movable piece 620 downward, and the second spring 612 pops the guide fixing plate 613 horizontally. The popped-out guide fixing plate 613 will not affect the downward movement of the movable piece 620. The movable piece 620 drives the support arm 621, and the support arm 621 drives the two movable arms through the gear 623. The connection between the first movable rod 624 and the second movable rod 625 of the two movable arms moves in opposite directions and drives the limiting block 626 to release the restriction of the upper limit support surface 702 of the limiting hook 7. With the pull of the large tension spring 632, it is enough to pull the limiting block 626 to a position where the limiting hook 7 can rotate on its own.

[0025] Further optimizing the design, a support groove 7011 and a buffer groove 7012 are respectively provided inside the hook body 701. The support groove 7011 abuts against the support leg, and the buffer groove 7012 is used to prevent the zinc oxide surge arrester 4 from falling out of the hook body 701. The support groove 7011 is used to provide support for the support leg of the zinc oxide surge arrester 4. When the zinc oxide surge arrester 4 is detached from the crossarm 3, the limiting hook 7 also begins to rotate clockwise. At this time, the buffer groove 7012 can reliably hang the zinc oxide surge arrester 4 on the limiting hook 7.

[0026] Further optimization of the design involves installing a buffer protection frame 641 and a support sliding frame 642 at the bottom of the base 2. The buffer protection frame 641 reduces the impact of the lead leg 5 on the support when the zinc oxide surge arrester 4 falls, while the support sliding frame 642 provides support for the limit block 626. A foamed rubber pad is fixed to the bottom surface of the buffer protection frame 641. When the zinc oxide surge arrester 4 detaches from the crossarm 3, the support leg slides from the support groove 7011 into the buffer groove 7012. The end of the zinc oxide surge arrester 4 and the lead leg 5 rotate clockwise around the buffer groove 7012. When the rotation reaches a certain angle, the lead leg 5 contacts the foamed rubber pad on the buffer protection frame 641, preventing the zinc oxide surge arrester 4 from detaching from the limit hook 7 and falling to the ground due to excessive rotation, thus avoiding injury to personnel or plants below.

[0027] To further optimize the design, lubricating oil grooves are provided on both the top and bottom surfaces of the limiting block 626. The top of the limiting block 626 is slidably connected to the bottom surface of the base 2, and the bottom surface of the base 2 can provide downward support for the limiting block 626. When the bottom of the limiting block 626 contacts the limiting support surface 702, it will receive upward support. When the limiting block 626 needs to move, in order to increase the smoothness of the movement of the limiting block 626, lubricating oil can be used to reduce sliding resistance and thus enhance the reliability of the structure.

[0028] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0029] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A detachable zinc oxide surge arrester, comprising a supporting insulator (1), a crossarm (3) mounted on the top of the supporting insulator (1), a zinc oxide surge arrester (4) abutting the bottom of the end of the crossarm (3) away from the supporting insulator (1), and a base (2) mounted on the bottom of the supporting insulator (1), characterized in that: The base (2) is equipped with a release mechanism (6) at its bottom. The release mechanism (6) includes a limiting slot (610), which is fixedly connected to the base (2). An adjustment component is installed on one side of the limiting slot (610), which is rotatably connected to the base (2). A limiting block (626) is rotatably connected to the end of the adjustment component away from the limiting slot (610). A positioning shaft (631) is fixedly connected to the base (2), and a large tension spring (632) is fixedly connected to the positioning shaft (631). One end away from the positioning shaft (631) is fixedly connected to the limiting block (626). A support shaft (704) is also fixedly connected to the base (2). A limiting hook (7) is rotatably connected to the support shaft (704). The limiting support surface (702) of the limiting hook (7) abuts against the limiting block (626). The hook body (701) of the limiting hook (7) abuts against the support leg of the zinc oxide surge arrester (4). A release box (8) abuts against the limiting slot (610). The release box (8) is electrically connected to the lead pin (5) of the zinc oxide surge arrester (4).

2. The detachable zinc oxide surge arrester according to claim 1, characterized in that: The bottom of the release box (8) is provided with a support cylinder (803) for supporting the internal structure. The two ends of the release box (8) are symmetrically slidably connected with telescopic chambers (801). The side wall of the telescopic chamber (801) is rotatably connected with a support rod (13). A leakage current protector (12) is installed on the inner side of the top of the telescopic chamber (801). The movable end of the support rod (13) abuts against the toggle lever of the leakage current protector (12). A small tension spring (14) is installed below the support rod (13). One end of the small tension spring (14) is fixed to the side wall of the telescopic chamber (801), and the other end is fixed to the support cylinder (803). A diode (9) is installed at the bottom of the telescopic chamber (801). The output end of the diode (9) is electrically connected to the leakage current protector (12), and the input end of the diode (9) is electrically connected to the lead pin (5).

3. The detachable zinc oxide surge arrester according to claim 2, characterized in that: The top of the release box (8) is provided with a functional compartment. A sound and light reminder (11) is fixedly connected to the bottom of the functional compartment. An insulating magnet (10) is placed above the sound and light reminder (11). An insulating sheet is provided between the sound and light reminder (11) and the insulating magnet (10). A knob cover (802) is detachably connected to the opening of the functional compartment. Several ventilation holes are provided on the knob cover (802). A thin sponge is sandwiched between the knob cover (802) and the insulating magnet (10).

4. The detachable zinc oxide surge arrester according to claim 1, characterized in that: A second spring (612) is fixedly connected to the side of the limiting slot (610) away from the adjusting component. A guide fixing plate (613) is fixedly connected to the second spring (612). The bottom edge of the guide fixing plate (613) is in contact with the inner wall of the limiting slot (610). A first spring (611) is installed on the top side of the limiting slot (610) near the second spring (612). The first spring (611) abuts against the adjusting component.

5. The detachable zinc oxide surge arrester according to claim 4, characterized in that: The bottom opening of the limiting slot (610) is provided with a guide horn.

6. The detachable zinc oxide surge arrester according to claim 4, characterized in that: The adjustment assembly includes a movable piece (620), which is located in the limiting slot (610) and abuts against the first spring (611). A support arm (621) is fixedly connected to one end of the movable piece (620) away from the first spring (611), and a movable arm is fixedly connected to the other end of the support arm (621). The two movable arms are arranged vertically and symmetrically. The support arm (621) is fixedly connected to the movable arm located above. The positioning shaft (631) is located between the two movable arms. The movable arm includes a gear (623). A fixed shaft (622) is rotatably connected to the middle of the gear (623). The fixed shaft (622) is fixedly connected to the base (2). A first movable rod (624) is fixedly connected to both sides of the gear (623). A second movable rod (625) is rotatably connected to the other end of the first movable rod (624). The other end of the second movable rod (625) is rotatably connected to the limiting block (626).

7. The detachable zinc oxide surge arrester according to claim 1, characterized in that: The hook body (701) is provided with a support groove (7011) and a buffer groove (7012). The support groove (7011) abuts against the support leg, and the buffer groove (7012) is used to prevent the zinc oxide surge arrester (4) from falling out of the hook body (701).

8. The detachable zinc oxide surge arrester according to claim 1, characterized in that: The base (2) is equipped with a buffer protection frame (641) and a support sliding frame (642). The buffer protection frame (641) is used to reduce the impact of the lead wire (5) on the bracket when the zinc oxide surge arrester (4) falls. The support sliding frame (642) is used to provide support for the limit block (626).

9. The detachable zinc oxide surge arrester according to claim 1, characterized in that: The limiting block (626) has lubricating oil grooves on its top and bottom surfaces.

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