Back-to-back knife switch security isolation device

Abstract

The application provides a back-to-back knife switch safety isolation device, and relates to the field of power grid isolation devices.The back-to-back knife switch safety isolation device comprises a knife switch body, a partition insulation cover and an insulation support frame.The knife switch body comprises a framework channel steel arranged on the knife switch body.The insulation support frame comprises an insulation support horizontal rod, one end of the insulation support horizontal rod being clamped into a clamping groove of the framework channel steel, and the other end of the insulation support horizontal rod being fixedly connected to the partition insulation cover.A first insulation support inclined rod is fixedly connected to the partition insulation cover.The partition insulation cover, the first insulation support inclined rod and the insulation support frame form a safety insulation cover for safely isolating operating personnel.The safety isolation device can protect the safety of maintenance personnel when the maintenance personnel approaches a running live part, avoids the risk of electric shock, and effectively solves the problem of load loss caused by busbar distribution and shutdown.

Description

Technical Field

[0001] This application relates to the field of power grid isolation device technology, specifically to a back-to-back knife switch safety isolation device. Background Technology

[0002] Back-to-back isolating switches are a type of outdoor pole-mounted switch arrangement. The busbar switch and the line switch are installed horizontally on the left and right sides of the same crossarm. Because the isolating switches are installed relatively close together, this type of isolating switch presents significant safety hazards during maintenance. Furthermore, due to the long service life of this equipment, it has reached a point where overheating and other defects are frequent. This back-to-back arrangement poses a significant safety risk to maintenance personnel when handling equipment defects, and maintenance personnel cannot completely isolate near-electric shock hazards when implementing safety measures. Because of the close proximity of the back-to-back structure to the busbar switch in the same bay, maintenance personnel's hands and objects are not effectively blocked during maintenance, easily leading to a risk of electric shock. Summary of the Invention

[0003] In view of this, this application provides a back-to-back knife switch safety isolation device, which solves the technical problem in the prior art that, due to the close proximity of the back-to-back isolation knife switch and the knife switch on the busbar side of the same bay due to their back-to-back structure, maintenance personnel's hands and objects are not effectively blocked during maintenance, which can easily cause the risk of electric shock.

[0004] This application provides a back-to-back knife switch safety isolation device, comprising: a knife switch body, the knife switch body including a structural channel steel disposed on the knife switch body; a partition insulating cover; an insulating support frame, the insulating support frame including: an insulating support crossbar, one end of the insulating support crossbar being inserted into a slot in the structural channel steel, and the other end of the insulating support crossbar being fixedly connected to the partition insulating cover; and a first insulating support diagonal bar, one end of the first insulating support diagonal bar being fixedly connected to the partition insulating cover, and the other end of the first insulating support diagonal bar being slidably connected to the insulating support crossbar; wherein, the partition insulating cover, the first insulating support diagonal bar, and the insulating support frame form a safety insulating cover for the safety isolation of operators.

[0005] In one possible implementation, the disconnector body further includes: a first disconnector support bottle and a second disconnector support bottle fixedly connected to both ends of the structural channel steel; a disconnector pull bottle fixedly connected to the middle of the structural channel steel; a first insulating plate, a second insulating plate, a first disconnector clamp, and a second disconnector clamp correspondingly disposed on the first disconnector support bottle and the second disconnector support bottle; a first disconnector stationary contact and a second disconnector stationary contact correspondingly fixedly connected to the first insulating plate and the second insulating plate; and a disconnector moving contact, one end of which is fixedly connected to the first disconnector stationary contact, and the other end of which is rotatably connected to the second disconnector stationary contact.

[0006] In one possible implementation, the insulating support crossbar includes: a first insulating support crossbar, the first end of which is inserted into a slot in the structural channel steel; a second insulating support crossbar, the second end of which is movably connected to the first end of the first insulating support crossbar, the second end of which is opposite to the first end of the first insulating support crossbar; and the second end of the second insulating support crossbar is fixedly connected to the partition insulating cover.

[0007] In one possible implementation, the safety isolation device further includes a slide rail disposed along the length of the second insulating support crossbar.

[0008] In one possible implementation, one end of the first insulating support diagonal rod is a fixed end, and the other end of the first insulating support diagonal rod is a sliding end. The fixed end of the first insulating support diagonal rod is fixedly connected to the insulating cover of the partition, and the sliding end of the first insulating support diagonal rod is slidably connected to the slide rail on the third insulating support crossbar.

[0009] In one possible implementation, the safety isolation device further includes locking structures at both ends of the slide rail, the locking structures being used to lock the sliding end of the first insulating diagonal rod within the slide rail; and sliding fasteners, the sliding fasteners being disposed on the second insulating support crossbar, the sliding fasteners being used to fix the first insulating support diagonal rod.

[0010] In one possible implementation, the safety isolation device further includes a connector that movably connects the first insulating support crossbar and the third insulating support crossbar. The connector includes: a nylon bolt for connecting the second end of the first insulating support crossbar to the first end of the second insulating support crossbar; and a rotating shaft disposed between the first insulating support crossbar and the first end of the first insulating support crossbar, and between the second insulating support crossbar and the first end of the second insulating support crossbar, for unfolding or folding the first insulating support crossbar and the second insulating support crossbar.

[0011] In one possible implementation, the connector further includes damping provided within the rotating shaft for fixing a preset angle when the insulating support crossbar is unfolded.

[0012] In one possible implementation, the safety isolation device further includes a second insulating support rod, the first end of which is fixedly connected to the second insulating support crossbar, and the second end of which is engaged with the knife gate bottle.

[0013] In one possible implementation, the safety isolation device further includes a buckle disposed at the first end of the first insulating support crossbar and the second end of the second insulating support diagonal bar. The buckle includes: an engaging portion that engages into the slot of the structural channel steel and the slot of the knife-switch bottle, the engaging portion having a semi-circular structure; and a fixing portion that is fixedly connected to both ends of the engaging portion, the fixing portion fixing the engaging portion to the structural channel steel and the knife-switch bottle.

[0014] This application provides a back-to-back knife switch safety isolation device, comprising: a knife switch body, the knife switch body including a structural channel steel disposed on the knife switch body; a partition insulating cover; an insulating support frame, the insulating support frame including: an insulating support crossbar, one end of the insulating support crossbar being inserted into a slot in the structural channel steel, and the other end of the insulating support crossbar being fixedly connected to the partition insulating cover; a sliding fastener, the sliding fastener being disposed on the insulating support crossbar; and a first insulating support diagonal bar, one end of the first insulating support diagonal bar being fixedly connected to the partition insulating cover, and the other end of the first insulating support diagonal bar being slidably connected to the insulating support crossbar; wherein, the partition insulating cover, the first insulating support diagonal bar, and the second insulating support diagonal bar form a safety insulating cover for the safety isolation of operators. This application facilitates the installation of the safety isolation device by snapping one end of the insulating support crossbar into the slot of the structural channel steel. The other end of the insulating support crossbar supports the partition insulation cover, which can protect the safety of maintenance personnel when they approach the live parts, avoid the risk of electric shock, and effectively solve the problem of load loss caused by busbar outage. Attached Figure Description

[0015] Figure 1 The image shown is a side view of a back-to-back knife switch safety isolation device and a knife switch body provided in an embodiment of this application.

[0016] Figure 2 The diagram shown is a schematic representation of the installation state of a back-to-back knife switch safety isolation device on the knife switch body according to an embodiment of this application.

[0017] Figure 3 The image shown is a front view of a back-to-back knife switch safety isolation device and the knife switch body provided in an embodiment of this application.

[0018] Figure 4 The diagram shown is a structural schematic of a back-to-back knife switch safety isolation device provided in an embodiment of this application.

[0019] Figure 5 The diagram shown is a schematic diagram of a folding structure of a back-to-back knife switch safety isolation device provided in an embodiment of this application.

[0020] Figure 6 The diagram shown is a structural schematic of the second insulating support crossbar and slide rail of a back-to-back knife switch safety isolation device provided in an embodiment of this application.

[0021] Figure 7 The diagram shown is a structural schematic of a back-to-back knife switch safety isolation device connector provided in an embodiment of this application.

[0022] Figure 8The diagram shown is a schematic diagram of the damping structure of a back-to-back knife switch safety isolation device according to an embodiment of this application.

[0023] Figure 9 The diagram shown is a structural schematic of a back-to-back knife switch safety isolation device buckle provided in an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Knife switch body; 11. First knife switch support; 111. First insulating plate; 112. First knife switch clamp; 113. First knife switch stationary contact; 12. Second knife switch support; 121. Second insulating plate; 122. Second knife switch clamp; 123. Second knife switch stationary contact; 13. Knife switch pull-out bottle; 14. Knife switch moving contact; 15. Frame channel steel;

[0026] 2. Partition insulation cover;

[0027] 3. Insulating support frame; 31. Insulating support crossbar; 311. First insulating support crossbar; 312. Second insulating support crossbar; 3121. Slide rail; 3122. Locking structure; 3123. Sliding fastener; 32. First insulating support diagonal bar; 33. Second insulating support diagonal bar; 34. Connector; 341. Nylon bolt; 342. Rotating shaft; 3421. Damping; 35. Buckle; 351. Engaging part; 352. Fixing part. Detailed Implementation

[0028] In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, top, bottom, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0029] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0031] Application Overview:

[0032] Back-to-back isolating switches are a type of outdoor pole-mounted switch arrangement. The busbar and line switches are installed horizontally on opposite sides of the same crossarm, forming a V-shaped structure. Because the isolating switches are installed relatively close together, this type of isolating switch presents significant safety hazards during maintenance. Back-to-back isolating switches are commonly found in older substations (35kV and 10kV pole-mounted switches) that have been in operation for over 10 years and have not been rectified in a timely manner due to their operational methods and other factors. According to statistics, there are currently 59 back-to-back disconnectors in operation within the Baoding jurisdiction of Baoding Power Supply Company. Among them, there are 7 back-to-back disconnectors at the 35kV voltage level in 110kV substations and 52 back-to-back disconnectors at the 10kV voltage level in 35kV substations. Due to the long service life of this equipment, it has reached a period of frequent defects such as overheating. The number of times maintenance personnel need to inspect this equipment has also increased accordingly. However, such a back-to-back arrangement structure poses a great safety risk to maintenance personnel when dealing with the defects of this equipment.

[0033] When a defect occurs, such as overheating of a busbar-side disconnector, it is indisputable to shut down the busbar side for repair. If the overheating is due to a line-side disconnector, a standard outage would only require shutting down a single bay to meet maintenance requirements. However, if the overheating is caused by a 10kV back-to-back disconnector, the close proximity of the back-to-back structure to the busbar-side disconnectors in the same bay poses a risk of electric shock to maintenance personnel due to the lack of effective obstruction of their hands and objects. If, from a safety perspective, the entire busbar in the affected bay needs to be shut down, this would inadvertently expand the outage area and increase load loss, even considering the off-season. During peak summer and winter seasons, and other special power supply periods, extending the outage time and increasing the number of affected customers would fail to guarantee the power supply load for users and would not meet equipment operating parameters.

[0034] Figure 1 The image shown is a side view of a back-to-back knife switch safety isolation device and a knife switch body provided in an embodiment of this application; Figure 2 The diagram shown is a schematic representation of the installation state of a back-to-back knife switch safety isolation device on the knife switch body according to an embodiment of this application. Figure 3The image shown is a front view of a back-to-back knife switch safety isolation device and the knife switch body according to an embodiment of this application; as shown... Figure 1 , Figure 2 as well as Figure 3 As shown, it includes: a knife switch body 1, the knife switch body 1 including a structural channel steel 15 disposed on the knife switch body 1; a partition insulating cover 2; and an insulating support frame 3, the insulating support frame 3 including: an insulating support crossbar 31, one end of the insulating support crossbar 31 being inserted into a slot in the structural channel steel 15, and the other end of the insulating support crossbar 31 being fixedly connected to the partition insulating cover 2; and a first insulating support diagonal bar 32, one end of the first insulating support diagonal bar 32 being fixedly connected to the partition insulating cover 2, and the other end of the first insulating support diagonal bar 32 being slidably connected to the insulating support crossbar 31; wherein, the partition insulating cover 2, the first insulating support diagonal bar 32, and the insulating support frame 3 form a safety insulating cover for the safe isolation of operators. This application facilitates the installation of the safety isolation device by snapping one end of the insulating support crossbar 31 into the slot of the structural channel steel 15. The other end of the insulating support crossbar 31 supports the partition insulating cover 2. The partition insulating cover 2 can protect the safety of maintenance personnel when they approach the live parts. It can effectively avoid the operation risks of maintenance personnel being close to the live points, limit the operation range of maintenance personnel, and not be obstructed or restricted by the device, so as to meet the equipment operation indicators, reduce the power outage time and the number of households affected, ensure the power supply load of users, avoid the risk of electric shock, and effectively solve the problem of load loss caused by the busbar side disconnection.

[0035] In one possible implementation, the switch body 1 further includes: a first switch support bottle 11 and a second switch support bottle 12 fixedly connected to both ends of the structural channel steel 15; a switch pull bottle 13 fixedly connected to the middle of the structural channel steel 15; a first insulating plate 111, a second insulating plate 121, a first switch clamp 112, and a second switch clamp 122 correspondingly disposed on the first switch support bottle 11 and the second switch support bottle 12; a first switch stationary contact 113 and a second switch stationary contact 123 correspondingly fixedly connected to the first insulating plate 111 and the second insulating plate 121; and a switch moving contact 14, one end of which is fixedly connected to the first switch stationary contact 113, and the other end of which is rotatably connected to the second switch stationary contact 123. In this application, one end of the partition insulating cover 2 is inserted between the first disconnector stationary contact 113 and the disconnector moving contact 14, and the other end of the partition insulating cover 2 is inserted between the second disconnector stationary contact 123 and the disconnector moving contact 14, thus fixing the position of the partition insulating cover 2 relatively. In addition, the partition insulating cover 2 is made of insulating material to avoid the risk of electric shock to maintenance personnel. Since the disconnector body 1 of this type has been in operation for a long time, the first disconnector clamp 112, the second disconnector clamp 122, the first disconnector stationary contact 113, the second disconnector stationary contact 123, and the disconnector moving contact 14 have been energized for a long time, causing frequent overheating. When maintenance personnel determine that the operating components are overheating, they need to pull the disconnector moving contact 14 off the first disconnector stationary contact 113 before carrying out maintenance.

[0036] Figure 4 The diagram shown is a structural schematic of a back-to-back knife switch safety isolation device provided in an embodiment of this application; Figure 5 The diagram shown is a schematic representation of a folding structure for a back-to-back knife switch safety isolation device according to an embodiment of this application; as shown... Figure 4 , Figure 5 As shown, and in combination Figure 1 The insulating support crossbar 31 includes: a first insulating support crossbar 311, the first end of which is inserted into a slot in the structural channel steel 15; and a second insulating support crossbar 312, the second end of which is movably connected to the first end of the first insulating support crossbar 311, with the second end of the first insulating support crossbar 311 and the first end of the first insulating support crossbar 311 being opposite ends; the second end of the second insulating support crossbar 312 is fixedly connected to the partition insulating cover 2. The insulating support crossbar 31 is made of insulating material, which ensures greater insulation performance and safety factor. The first end of the first insulating support crossbar 311 inserted into the slot in the structural channel steel 15 provides support for the safety isolation device and forms an isolation measure for maintenance personnel, facilitating maintenance work when the hands and objects of maintenance personnel are not effectively obstructed.

[0037] Figure 6The diagram shown is a structural schematic of the second insulating support crossbar and slide rail of a back-to-back knife switch safety isolation device according to an embodiment of this application; as shown Figure 6 As shown, the safety isolation device also includes a slide rail 3121 arranged along the length of the second insulating support crossbar 312. The slide rail 3121 facilitates the adjustment of the length and angle of the partition insulating cover 2. The angle of the partition insulating cover 2 in this application is 0°-150°, and the angle of the partition insulating cover 2 can be adjusted within the range of 0°-150° to a suitable angle for maintenance personnel to perform maintenance work.

[0038] In one possible implementation, such as Figure 6 As shown, one end of the first insulating support diagonal rod 32 is a fixed end, and the other end is a sliding end. The fixed end of the first insulating support diagonal rod 32 is fixedly connected to the partition insulating cover 2, and the sliding end of the first insulating support diagonal rod 32 is slidably connected to the slide rail 3121 on the second insulating support crossbar 312. The fixed end of the first insulating support diagonal rod 32 is fixed to one end of the partition insulating cover 2, and the sliding end of the first insulating support diagonal rod 32 is slidably connected to the slide rail 3121 of the second insulating support crossbar 312. The first insulating support diagonal rod 32 adjusts the angle of the partition insulating cover 2 by sliding on the slide rail 3121, so that the angle of the partition insulating cover 2 is suitable for maintenance personnel to perform maintenance work.

[0039] In one possible implementation, such as Figure 6 As shown, the safety isolation device also includes locking structures 3122 at both ends of the slide rail 3121. The locking structures 3122 are used to fix the sliding end of the first insulating support rod 32 onto the slide rail 3121, preventing the first insulating support rod 32 from sliding on its own. Figure 4 as well as Figure 5 As shown, the sliding fastener 3123 is disposed on the second insulating support crossbar 312 and is used to fix the position of the first insulating support diagonal bar 32 on the second insulating support crossbar 312.

[0040] Figure 7 The diagram shown is a structural schematic of a back-to-back knife switch safety isolation device connector according to an embodiment of the application; as follows: Figure 7As shown, the safety isolation device also includes a connector 34 that movably connects the first insulating support crossbar 311 and the second insulating support crossbar 312. The connector 34 includes: a nylon bolt 341, which connects the second end of the first insulating support crossbar 311 to the first end of the second insulating support crossbar 312; and a rotating shaft 342, which is respectively disposed between the first insulating support crossbar 311 and the first end of the first insulating support crossbar 311, and between the second insulating support crossbar 312 and the first end of the second insulating support crossbar 312, for unfolding or folding the first insulating support crossbar 311 and the second insulating support crossbar 312. When not in use, the first insulating support crossbar 311 and the second insulating support crossbar 312 can be folded, and the first insulating support diagonal bar 32 can be slid to the second end of the second insulating support crossbar 312. The partition insulating cover 2, the first insulating support crossbar 311, the second insulating support crossbar 312, and the first insulating support diagonal bar 32 can be folded up and placed in a special integrated box for easy storage and carrying. The connector 34 in this application is made of nylon bolt 341, which has good insulation properties and is non-conductive, further ensuring the personal safety of maintenance personnel during maintenance.

[0041] Figure 8 The diagram shown is a structural schematic of a back-to-back knife switch safety isolation device damping according to an embodiment of this application. Figure 8 As shown, the connector 34 also includes a damper 3421 disposed in the rotating shaft 342, which is used to fix a preset angle when the insulating support crossbar 31 is unfolded.

[0042] In one possible implementation, such as Figure 2 As shown, the safety isolation device also includes a second insulating support rod 33. The first end of the second insulating support rod 33 is fixedly connected to the second insulating support crossbar 312, and the second end of the second insulating support rod 33 is snapped onto the knife switch bottle 13. The second insulating support rod 33 further fixes the safety isolation device to the knife switch body 1, and together with the first insulating support rod 32, ensures the stability of the safety isolation device.

[0043] Figure 9 The diagram shown is a structural schematic of a back-to-back knife switch safety isolation device buckle according to an embodiment of this application; as shown Figure 9 As shown, and in combination Figure 1 as well as Figure 2The safety isolation device also includes a buckle 35 located at the first end of the first insulating support crossbar 311 and the second end of the second insulating support diagonal bar 33. The buckle 35 includes: an engaging part 351, which engages into the slots of the structural channel steel 15 and the knife switch bottle 13, and the engaging part 351 has a semi-circular structure; and a fixing part 352, which is fixedly connected to both ends of the engaging part 351, and the fixing part 352 fixes the engaging part 351 to the structural channel steel 15 and the knife switch bottle 13. The safety isolation device can be stably fixed on the knife switch frame. After maintenance is completed, the buckle 35 can be easily removed from the slots of the structural channel steel 15 and the knife switch bottle 13, and the safety isolation device can be folded and placed into the integrated box.

[0044] Maintenance Workflow: Before starting work, maintenance personnel remove the safety isolation device from the integrated box. They then correctly use safety protective equipment, donning safety belts, and proceed with the work at height. Upon reaching the work position, they fasten their safety belts and use a transfer rope to pass the safety isolation device to the maintenance location. After putting on insulated gloves, they install the safety isolation device as required, fixing the buckle 35 at the first end of the first insulating support crossbar 311 into the slot of the structural channel steel 15. The angle of the safety isolation device is adjusted according to the required work point. Generally, the safe distance for maintenance is 0.6-0.7 meters. After adjusting the safe distance, maintenance begins. After maintenance is completed, the first insulating support crossbar 311 is removed. After the first end buckle 35 is fixed in the slot of the structural channel steel 15 and removed, the first insulating support crossbar 311 and the second insulating support crossbar 312 are folded and placed into the integrated box. This device can be folded and packed before installation and after work. During installation, it can be opened to the predetermined position according to your work needs. This device can isolate the live point by using a safety isolation device in back-to-back knife switch maintenance work, so that maintenance personnel can work in a safer environment and avoid the risk of electric shock. It also effectively solves the problem of load loss caused by busbar outage. The maintenance outage time has been shortened from about 4 hours to about 3 hours, directly reducing the maintenance outage time by about 25%.

[0045] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A back-to-back knife switch security isolation device, characterized in that, The back-to-back knife switch safety isolation device comprises a knife switch body (1), a partition insulation cover (2), an insulation support frame (3), a first insulation support inclined rod (32), a first insulation support horizontal rod (311) and a second insulation support horizontal rod (312). The insulation support frame (3) comprises an insulation support horizontal rod (31), one end of the insulation support horizontal rod (31) is clamped into a clamping groove of the framework channel steel (15), and the other end of the insulation support horizontal rod (31) is fixedly connected to the partition insulation cover (2). The first insulation support inclined rod (32) is fixedly connected to the partition insulation cover (2) at one end and is slidingly connected to the insulation support horizontal rod (31) at the other end. The partition insulation cover (2), the first insulation support inclined rod (32) and the insulation support frame (3) form a safety insulation cover for safely isolating an operator. The insulation support horizontal rod (31) comprises a first insulation support horizontal rod (311) and a second insulation support horizontal rod (312). The first end of the first insulation support horizontal rod (311) is clamped into the clamping groove of the framework channel steel (15). The second end of the first insulation support horizontal rod (311) is movably connected to the first end of the second insulation support horizontal rod (312), and the second end of the first insulation support horizontal rod (311) is opposite to the first end of the first insulation support horizontal rod (311). The second end of the second insulation support horizontal rod (312) is fixedly connected to the partition insulation cover (2). The back-to-back knife switch safety isolation device further comprises a sliding rail (3121) arranged along the length direction of the second insulation support horizontal rod (312). One end of the first insulation support inclined rod (32) is a fixed end, and the other end of the first insulation support inclined rod (32) is a sliding end. The fixed end of the first insulation support inclined rod (32) is fixedly connected to the partition insulation cover (2), and the sliding end of the first insulation support inclined rod (32) is slidingly connected to the sliding rail (3121) on the second insulation support horizontal rod (312). The knife switch body (1) further comprises a first knife switch support bottle (11) and a second knife switch support bottle (12) fixedly connected to both ends of the framework channel steel (15). A knife switch pull bottle (13) is fixedly connected to the middle of the framework channel steel (15). A first insulation plate (111), a second insulation plate (121), a first knife switch wire clamp (112) and a second knife switch wire clamp (122) are correspondingly arranged on the first knife switch support bottle (11) and the second knife switch support bottle (12). A first knife switch static contact (113) and a second knife switch static contact (123) are correspondingly fixedly connected to the first insulation plate (111) and the second insulation plate (121). A knife switch moving contact (14) is fixedly connected to the first knife switch static contact (113) at one end and is rotatably connected to the second knife switch static contact (123) at the other end. The back-to-back knife switch safety isolation device further comprises a second insulating support inclined rod (33), a first end of the second insulating support inclined rod (33) is fixedly connected to the second insulating support horizontal rod (312), and a second end of the second insulating support inclined rod (33) is clamped on the knife switch pull bottle (13).

2. The back-to-back knife switch safety isolation device according to claim 1, characterized in that, The back-to-back knife switch safety isolation device further comprises locking structures (3122) arranged at two ends of the sliding rail (3121), the locking structures (3122) are used for fixing the sliding end of the first insulating support inclined rod (32) in the position of the sliding rail (3121). A sliding fastener (3123) is arranged on the second insulating support horizontal rod (312), and the sliding fastener (3123) is used for fixing the first insulating support inclined rod (32).

3. The back-to-back cut-through device of claim 1, wherein: The back-to-back knife switch safety isolation device further comprises a connecting piece (34) movably connecting the first insulating support horizontal rod (311) and the third insulating support horizontal rod (313), the connecting piece (34) comprises: a nylon bolt (341), the second end of the first insulating support horizontal rod (311) and the first end of the second insulating support horizontal rod (312) are connected through the nylon bolt (341); and a rotating shaft (342), the rotating shaft (342) is arranged between the first insulating support horizontal rod (311) and the first end of the first insulating support horizontal rod (311), and between the second insulating support horizontal rod (312) and the first end of the second insulating support horizontal rod (312), and is used for unfolding or folding the first insulating support horizontal rod (311) and the second insulating support horizontal rod (312).

4. The back-to-back cut-through device of claim 3, wherein: The connecting piece (34) further comprises a damper (3421) arranged in the rotating shaft (342), and the damper (3421) is used for fixing a preset angle when the insulating support horizontal rod (31) is unfolded.

5. The back-to-back cut-through device of claim 1, wherein: The back-to-back knife switch safety isolation device further comprises buckles (35) arranged at the first end of the first insulating support horizontal rod (311) and the second end of the second insulating support inclined rod (33), the buckles (35) comprise: a clamping part (351), the clamping part (351) is clamped into a clamping groove of the framework channel steel (15) and a clamping groove of the knife switch pull bottle (13), and the clamping part (351) has a semicircular structure; and a fixing part (352), the fixing part (352) is fixedly connected to two ends of the clamping part (351), and the fixing part (352) fixes the clamping part (351) to the framework channel steel (15) and the knife switch pull bottle (13).

Images