Assembly type high-low voltage bus bridge

Abstract

The present application relates to bus bridge technical field, especially to a kind of prefabricated high-low voltage bus bridge.The technical scheme includes bridge, still including multiple bus installed in bridge, the bus includes access row, tilting row rotatably installed on access row, expansion row slidably installed on tilting row, correction row rotatably installed on expansion row, corner row slidably installed on correction row and lead-out row fixedly installed on corner row.The present application uses pre-tightening force crimping type flexible connection structure, allows the free rotation of connecting point within a certain angle to adapt to the position deviation of equipment, while can keep constant contact area and pressure, ensure the reliability of electrical connection, greatly improve the installation tolerance, so that engineering site can flexibly cope with unpredictable equipment position change, without cutting welding or waiting for new parts, so as to realize quick adjustment, shorten construction period, reduce comprehensive cost and fundamentally improve the adaptability and reliability of installation process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of busbar bridges, and particularly relates to a prefabricated high-low voltage busbar bridge. BACKGROUND

[0002] The connection between transformers and switch cabinets in substations, data centers and large industrial plants generally adopts the parallel laying mode of multiple cables, which not only has inherent defects such as long construction period, large space occupation, and many cable compression points prone to heating, but also is difficult to withstand large current transmission of thousands of amperes, and the reliability and safety have obvious bottlenecks. With the sharp increase of modern power load and the improvement of the requirement for power supply continuity, a prefabricated modular power transmission solution has emerged as the times require - a prefabricated busbar bridge. Its core uses high-conductivity copper bars or aluminum bars as rigid conductors, which are accurately fixed on the internal insulating support through standardized design and are integrally enclosed in a metal shell to form a fully enclosed structure, thereby greatly improving the protection level and safety.

[0003] In the traditional installation practice of the prefabricated high-low voltage busbar bridge, there is always a significant defect: when the relative positions of the on-site transformers and switch cabinets are temporarily changed after being positioned, the rigid busbar bridge that is pre-customized and produced is difficult to quickly adapt to the adjustment. Although the modular design is conducive to assembly, it lacks on-site plasticity, and any size deviation may result in the entire unit being scrapped or requiring factory reprocessing, not only causing delay in the construction period and a sharp increase in costs, but also exposing the inherent problem of low tolerance of the installation process. SUMMARY

[0004] The purpose of the present application is to solve the problems in the background art, and to provide a prefabricated high-low voltage busbar bridge that allows the connection points to rotate freely within a certain angle to adapt to the position deviation of the equipment, while maintaining a constant contact area and pressure to ensure the reliability of the electrical connection.

[0005] The technical scheme of the present application: a prefabricated high-low voltage busbar bridge, comprising a bridge, further comprising:

[0006] A plurality of busbars installed in the bridge, the busbars comprising an access bar, an inclined bar rotatably installed on the access bar, an extension bar slidably installed on the inclined bar, a correction bar rotatably installed on the extension bar, a corner bar slidably installed on the correction bar, and a lead-out bar fixedly installed on the corner bar;

[0007] The first rotating connecting part is arranged in the bridge and is used for rotatingly connecting the access row and the inclined row, the first limiting connecting part is used for slidingly connecting the inclined row and the telescopic row, the first rotating connecting part controls the coaxial rotation of the access row and the inclined row and controls the contact area of the access row and the inclined row to be always unchanged, and the first limiting connecting part controls the inclined row and the telescopic row to be always inclined and controls whether the inclined row and the telescopic row can slide relative to each other.

[0008] Optionally, one end of the access row is provided with a first circular connecting part, one end of the inclined row is provided with a second circular connecting part which is rotationally connected with the first circular connecting part, one end of the telescopic row is provided with a third circular connecting part, and one end of the correction row is provided with a fourth circular connecting part which is rotationally connected with the third circular connecting part.

[0009] Optionally, the first rotating connecting part comprises two connecting discs which are fixedly connected through a plurality of fasteners, one of the connecting discs is provided with a pin shaft which is inserted, and the bridge is provided with an insulator which supports the bus bar, and the insulator is provided with a pin hole which is rotationally connected with the pin shaft.

[0010] Optionally, a plurality of supporting wheels are rotationally arranged on the connecting disc, and the connecting disc is provided with an accommodating hole through which the insulator passes.

[0011] Optionally, the first limiting connecting part comprises two pressing plates which are fixedly connected through a plurality of bolt connecting pieces, the two pressing plates are located on two sides of the inclined row and the telescopic row, a plurality of limiting wheels are rotationally arranged between the two pressing plates, and the limiting wheels are attached to edges of the inclined row and the telescopic row.

[0012] Optionally, the first limiting connecting part further comprises a supporting seat which is fixedly arranged on the pressing plate, a screw rod is threadedly connected to the supporting seat, a limiting plate is fixedly arranged at one end of the screw rod, the two limiting plates on the same first limiting connecting part are opposite to each other, and edges of the two limiting plates are respectively attached to end faces of the inclined row and the telescopic row.

[0013] Optionally, a second rotating connecting part is rotationally arranged between the telescopic row and the correction row, the second rotating connecting part is the first rotating connecting part, and the connecting discs are located on two sides of the third circular connecting part and the fourth circular connecting part.

[0014] Optionally, a second limiting connecting part is arranged between the correction row and the corner row, the second limiting connecting part is the first limiting connecting part, and the pressing plates are located on two sides of the correction row and the corner row.

[0015] Optionally, the bridge frame is internally fixedly installed with an insulating support frame for supporting the insulator, the insulating support frame is provided with a sliding groove, a sliding block is slidingly installed in the sliding groove, the insulator is rotationally connected with the sliding block, and a positioning assembly for limiting the position of the sliding block is installed on the insulating support frame.

[0016] The positioning assembly comprises a limiting cylinder fixedly installed on the insulating support frame, a blocking plate is slidingly installed in the limiting cylinder, a sealing ring is fixedly installed on the blocking plate, a traction rod fixedly connected with the sliding block is fixedly installed on the blocking plate, both ends of the limiting cylinder are communicated through a conveying pipe, a valve is fixedly installed on the conveying pipe, and the limiting cylinder and the conveying pipe are both filled with hydraulic medium.

[0017] Optionally, the bridge frame comprises a plurality of modularly arranged bridge boxes, the bridge box comprises a support frame and a sheet metal part fixedly installed on the support frame, the support frame is provided with a plurality of connecting holes, and adjacent two bridge boxes are fixedly connected through the connecting holes and connecting pieces.

[0018] One of the bridge boxes is slidingly installed with a sliding body.

[0019] In summary, the present application has at least one of the following beneficial technical effects:

[0020] The pre-tightening force crimping type flexible connection structure uses a copper plate with a circular end to replace the traditional flat end, and implements compression and fixation through a rotating connection component. The circular end face allows the connection point to rotate freely within a certain angle to adapt to the position deviation of the equipment, while maintaining a constant contact area and pressure, ensuring the reliability of the electrical connection, greatly improving the installation tolerance, enabling the engineering site to flexibly respond to unpredictable equipment position changes, without the need for cutting, welding or waiting for new components, thereby realizing rapid adjustment, shortening the construction period, reducing the comprehensive cost and fundamentally improving the adaptability and reliability of the installation process. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Structure of the bus bridge Figure 1 ;

[0022] Figure 2 Structure of the bus bridge Figure 2 ;

[0023] Figure 3 Position distribution of the bus

[0024] Figure 4 Structure of the bus

[0025] Figure 5 Position of the first rotating connection component and the first limiting connection component

[0026] Figure 6 Structure diagram of the first rotating connecting component;

[0027] Figure 7 Structure diagram of the first limiting connecting component;

[0028] Figure 8 Structure diagram of the insulating support frame;

[0029] Figure 9 Structure diagram of Figure 8 Enlarged view of A in the middle;

[0030] Figure 10 Structure diagram of the bridge box;

[0031] Figure 11 Structure diagram of the bridge box connection.

[0032] Fig. 1 is a bridge; 11 is a bridge box; 111 is a support frame; 112 is a sheet metal part; 113 is a connecting hole; 114 is a sliding body; 2 is a busbar; 21 is an access row; 211 is a first circular connecting part; 22 is an inclined row; 221 is a second circular connecting part; 23 is an extension row; 231 is a third circular connecting part; 24 is a correction row; 241 is a fourth circular connecting part; 25 is a corner row; 26 is a lead-out row; 3 is a first rotating connecting component; 31 is a connecting disc; 32 is a fastener; 33 is a pin shaft; 34 is a pin hole; 35 is a supporting wheel; 36 is a containing hole; 4 is a first limiting connecting component; 41 is a pressing plate; 42 is a bolt connecting part; 43 is a limiting wheel; 44 is a supporting seat; 45 is a lead screw; 46 is a limiting plate; 5 is a second rotating connecting component; 6 is a second limiting connecting component; 7 is an insulator; 8 is an insulating support frame; 81 is a sliding groove; 82 is a sliding block; 83 is a positioning assembly; 831 is a limiting cylinder; 832 is a plugging plate; 833 is a sealing ring; 834 is a traction rod; 835 is a conveying pipe; 836 is a valve. DETAILED DESCRIPTION

[0033] The technical solutions of the present application are further described below in combination with the drawings and specific embodiments.

[0034] As Figure 1 , Figure 2 , Figure 10 , Figure 11As shown, the present invention proposes a prefabricated high and low voltage busbar bridge, including a cable tray 1, with cable buses located inside the cable tray 1. The cable tray protects the cable buses. The cable tray 1 includes multiple modularly configured cable boxes 11. Disassembling the cable tray into multiple cable boxes 11 facilitates transportation and allows for rapid assembly on-site. Each cable box 11 includes a support frame 111 and sheet metal parts 112 fixedly installed on the support frame 111. The support frame 111 has multiple connection holes 113. Two adjacent cable boxes 11 are fixedly connected through the connection holes 113 and connectors. When two cable boxes 11 are fixedly connected, they are first aligned and then fixed by passing bolts through the connection holes 113 and securing them with nuts. One of the cable boxes 11 has a sliding body 114 slidably installed. When the relative positions of the transformer and switchgear are temporarily changed after they are in place, the length of a single cable box 11 can be changed by moving the sliding body 114. This allows for timely adjustments to the changes in the on-site installation position without the need to remake the corresponding cable boxes, facilitating flexible adjustments and effectively shortening the construction progress.

[0035] As one implementation method, such as Figures 1 to 4 As shown, the busbar bridge also includes multiple busbars 2 installed in the cable tray 1. The busbars 2 are either copper or aluminum. The circuit is transmitted through the busbars 2. The busbars 2 include an access busbar 21, an inclined busbar 22 rotatably installed on the access busbar 21, a telescopic busbar 23 slidably installed on the inclined busbar 22, a straightening busbar 24 rotatably installed on the telescopic busbar 23, a corner busbar 25 slidably installed on the straightening busbar 24, and a lead-out busbar 26 fixedly installed on the corner busbar 25. When the relative position of the transformer and switchgear changes temporarily after they are in place, the lead-out busbar 26 can be adjusted in two directions in the horizontal plane by rotating the inclined busbar 22, sliding the telescopic busbar 23, rotating the straightening busbar 24 and sliding the corner busbar 25. This can adapt to the rapid adjustment after the relative position of the transformer and switchgear deviates from the preset position.

[0036] Furthermore, one end of the access bus 21 is provided with a first circular connecting part 211, and one end of the inclined bus 22 is provided with a second circular connecting part 221 rotatably connected to the first circular connecting part 211. The arrangement of the first circular connecting part 211 and the second circular connecting part 221 ensures that the contact area of ​​the first circular connecting part 211 and the second circular connecting part 221 remains unchanged when the inclined bus 22 rotates relative to the access bus 21, thus maintaining the stability of the connection. One end of the telescopic bus 23 is provided with a third circular connecting part 231, and one end of the straightening bus 24 is provided with a fourth circular connecting part 241 rotatably connected to the third circular connecting part 231. When the telescopic bus 23 and the straightening bus 24 rotate relative to each other, the arrangement of the third circular connecting part 231 and the fourth circular connecting part 241 ensures that the contact area of ​​the telescopic bus 23 and the straightening bus 24 remains unchanged. When making the connection, conductive adhesive can be applied between two adjacent busbars.

[0037] As one implementation method, such as Figures 2 to 6 As shown, the busbar bridge in this embodiment also includes a first rotating connection component 3 installed in the cable tray 1 to rotatably connect the access busbar 21 and the inclined busbar 22. The first rotating connection component 3 controls the access busbar 21 and the inclined busbar 22 to rotate coaxially and controls the contact area between the access busbar 21 and the inclined busbar 22 to remain constant. The first circular connection part 211 and the second circular connection part 221 are assembled through the first rotating connection component 3 to maintain the rotatable connection while ensuring the temperature of the contact between the first circular connection part 211 and the second circular connection part 221.

[0038] Furthermore, the first rotating connecting component 3 includes two connecting discs 31, which are fixedly connected by multiple fasteners 32. The first circular connecting part 211 and the second circular connecting part 221 are located between the two connecting discs 31. By tightening the distance between the two connecting discs 31 with the fasteners 32, the two connecting discs 31 can press the first circular connecting part 211 and the second circular connecting part 221 together, so that the first circular connecting part 211 and the second circular connecting part 221 fit together. A pin 33 is inserted into one of the connecting discs 31. An insulator 7 supporting the busbar 2 is installed in the cable tray 1. The insulator 7 is provided with a pin hole 34 that is rotatably connected to the pin 33. The first circular connecting part 211 and the second circular connecting part 221 can be coaxially installed through the pin 33 and the pin hole 34, and the first circular connecting part 211 and the second circular connecting part 221 are rotatably connected to the insulator 7. The first circular connecting part 211 and the second circular connecting part 221 can be positioned through the insulator 7.

[0039] Each of the connecting discs 31 is rotatably mounted with multiple support wheels 35. One of the connecting discs 31 is provided with a receiving hole 36 for the insulator 7 to pass through. The support wheels 35 can reduce the friction between the first circular connecting part 211, the second circular connecting part 221 and the connecting disc 31, making it easier to rotate the second circular connecting part 221.

[0040] like Figure 3 and Figure 4 As shown, a second rotating connecting component 5 is rotatably installed between the telescopic row 23 and the straightening row 24. The second rotating connecting component 5 is the same as the first rotating connecting component 3 mentioned above. The connecting plate 31 is located on both sides of the third circular connecting part 231 and the fourth circular connecting part 241. The third circular connecting part 231 and the fourth circular connecting part 241 can be rotatably connected through the second rotating connecting component 5.

[0041] As one implementation method, such as Figures 3 to 5 , Figure 7 As shown, the busbar bridge in this embodiment also includes a first limiting connection component 4 that slides the inclined busbar 22 and the telescopic busbar 23 together. The first limiting connection component 4 controls the inclined busbar 22 and the telescopic busbar 23 to always remain inclined, and controls whether the inclined busbar 22 and the telescopic busbar 23 can slide relative to each other. In the prior art, two adjacent busbars are fixedly connected by openings and bolts. However, this connection method cannot flexibly adjust the overlap length between the two busbars, resulting in the inability to quickly adjust the installation position. The first limiting connection component 4 can satisfy the connection stability between the inclined busbar 22 and the telescopic busbar 23, and allow the inclined busbar 22 and the telescopic busbar 23 to be adjusted relative to each other.

[0042] Furthermore, the first limiting connection component 4 includes two pressure plates 41, which are fixedly connected by multiple bolts 42. The two pressure plates 41 are located on both sides of the inclined row 22 and the telescopic row 23. By reducing the distance between the two pressure plates 41 through the bolts 42, the pressure plates 41 can press and fix the inclined row 22 and the telescopic row 23. At this time, the inclined row 22 and the telescopic row 23 may not be limited in the axial and radial directions. Therefore, multiple limiting wheels 43 are rotatably installed between the two pressure plates 41. The limiting wheels 43 are in contact with the edges of the inclined row 22 and the telescopic row 23. The setting of the limiting wheels 43 can limit the radial position of the inclined row 22 and the telescopic row 23, which can prevent misalignment between the inclined row 22 and the telescopic row 23 and ensure that the contact area between the inclined row 22 and the telescopic row 23 is always at its maximum value.

[0043] Furthermore, to prevent movement between the inclined row 22 and the telescopic row 23 without adjusting their positions, the first limiting connection component 4 also includes a support base 44 fixedly installed on the pressure plate 41. A lead screw 45 is threaded onto the support base 44, and a limiting plate 46 is fixedly installed at one end of the lead screw 45. The two limiting plates 46 on the same first limiting connection component 4 are in opposite directions, and the edges of the two limiting plates 46 are respectively in contact with the end faces of the inclined row 22 and the telescopic row 23. By rotating the lead screw 45, the limiting plates 46 are driven to abut against the edges of the inclined row 22 and the telescopic row 23, thus preventing axial movement of the inclined row 22 and the telescopic row 23.

[0044] like Figure 3 and Figure 4 As shown, a second limiting connection component 6 is installed between the straightening row 24 and the corner row 25. The second limiting connection component 6 is the same as the first limiting connection component 4 mentioned above. The pressure plate 41 is located on both sides of the straightening row 24 and the corner row 25. The straightening row 24 and the corner row 25 can be slidably connected through the second limiting connection component 6. When the straightening row 24 and the corner row 25 need to be adjusted, they can be adjusted quickly. When the straightening row 24 and the corner row 25 do not need to be adjusted, the stability of the connection between the straightening row 24 and the corner row 25 can be guaranteed.

[0045] like Figure 8 and Figure 9 As shown, an insulating support frame 8 is fixedly installed inside the cable tray 1 to support the insulator 7. The insulating support frame 8 is provided with a sliding groove 81, and a slider 82 is slidably installed in the sliding groove 81. The insulator 7 is rotatably connected to the slider 82. When the tilting row 22 rotates, in order to prevent the corner row 25 from tilting, the straightening row 24 needs to move laterally. The sliding direction of the straightening row 24 can be restricted by the sliding direction of the insulator 7. A positioning component 83 is installed on the insulating support frame 8 to limit the position of the slider 82. The positioning component 83 can prevent the insulator 7 from moving, and the position of the corner row 25 will not change at this time.

[0046] Furthermore, the positioning component 83 includes a limiting cylinder 831 fixedly installed on the insulating support frame 8. A sealing plate 832 is slidably installed inside the limiting cylinder 831. A sealing ring 833 is fixedly installed on the sealing plate 832. A traction rod 834 fixedly connected to the slider 82 is fixedly installed on the sealing plate 832. The two ends of the limiting cylinder 831 are connected through a conveying pipe 835. A valve 836 is fixedly installed on the conveying pipe 835. Both the limiting cylinder 831 and the conveying pipe 835 are filled with hydraulic medium. The hydraulic medium is a liquid that cannot be compressed in the working environment. When the valve 836 is opened, the movement of the sealing plate 832 allows the hydraulic medium inside the limiting cylinder 831 to exchange with each other through the conveying pipe 835. When the valve 836 is closed, the hydraulic medium on both sides of the limiting cylinder 831 cannot exchange and cannot be compressed. Therefore, the sealing plate 832 cannot move, which in turn prevents the traction rod 834 and the slider 82 from moving, and consequently prevents the insulator 7 from moving.

[0047] In this embodiment, when the relative positions of the transformer and the switchgear change temporarily, the angle is adjusted by rotating the inclined busbar 22 mounted on the access busbar 21, and the length is adjusted by sliding the telescopic busbar 23 mounted on the inclined busbar 22. Then, the angle is corrected by rotating the straightening busbar 24 mounted on the telescopic busbar 23, and finally, the final position is finely adjusted by sliding the corner busbar 25 mounted on the straightening busbar 24. This allows for flexible adjustment of the lead-out busbar 26 in multiple directions. During this process, all rotating connections are achieved through the busbar with circular connecting parts, such as the first circular connecting part 211 and the second circular connecting part 221, and the first rotating connection component 3. This component uses two connecting discs 31 and fasteners 32 to press the circular end face, ensuring its stability in any position. The contact area and pressure remain constant under any rotation angle, thus ensuring the reliability of the electrical connection. After adjustment, the sliding body is pressed and locked by the first limiting connection component 4, which includes a pressure plate 41 fixed by bolted connector 42, a limiting wheel 43, and a limiting plate 46 driven by screw 45, to prevent axial movement. The insulator 7 supporting the busbar 2 in the entire cable tray 1 slides in the groove 81 of the insulating support frame 8 via slider 82 to adapt to the adjustment, and is finally locked by the hydraulic positioning component 83. After the valve 836 is closed, the incompressible hydraulic medium in the limiting cylinder 831 and the conveying pipe 835 fixes the sealing plate 832, thereby locking the position of slider 82 and insulator 7 by traction rod 834, ensuring the mechanical stability of the overall structure.

[0048] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A prefabricated high and low voltage busbar bridge, comprising a cable tray (1), characterized in that, Also includes: Multiple busbars (2) installed in the cable tray (1), the busbars (2) include access busbars (21), inclined busbars (22) rotatably installed on access busbars (21), telescopic busbars (23) slidably installed on inclined busbars (22), straightening busbars (24) rotatably installed on telescopic busbars (23), corner busbars (25) slidably installed on straightening busbars (24), and lead-out busbars (26) fixedly installed on corner busbars (25); The first rotating connecting component (3) installed in the cable tray (1) to rotatably connect the access row (21) and the inclined row (22), and the first limiting connecting component (4) to slidably connect the inclined row (22) and the telescopic row (23), the first rotating connecting component (3) controls the access row (21) and the inclined row (22) to rotate coaxially and controls the contact area of ​​the access row (21) and the inclined row (22) to remain constant, the first limiting connecting component (4) controls the inclined row (22) and the telescopic row (23) to always remain inclined, and controls whether the inclined row (22) and the telescopic row (23) can slide relative to each other; The first limiting connection component (4) includes two pressure plates (41), which are fixedly connected by multiple bolts (42). The two pressure plates (41) are located on both sides of the inclined row (22) and the telescopic row (23). Multiple limiting wheels (43) are rotatably installed between the two pressure plates (41), and the limiting wheels (43) are in contact with the edges of the inclined row (22) and the telescopic row (23). The first limiting connection component (4) also includes a support base (44) fixedly installed on the pressure plate (41). A screw rod (45) is threadedly connected to the support base (44). A limiting plate (46) is fixedly installed at one end of the screw rod (45). The two limiting plates (46) on the same first limiting connection component (4) are in opposite directions. The edges of the two limiting plates (46) are respectively in contact with the end faces of the inclined row (22) and the telescopic row (23).

2. The prefabricated high and low voltage busbar bridge according to claim 1, characterized in that, One end of the access row (21) is provided with a first circular connecting part (211), one end of the inclined row (22) is provided with a second circular connecting part (221) rotatably connected to the first circular connecting part (211), one end of the telescopic row (23) is provided with a third circular connecting part (231), and one end of the correction row (24) is provided with a fourth circular connecting part (241) rotatably connected to the third circular connecting part (231).

3. The prefabricated high and low voltage busbar bridge according to claim 2, characterized in that, The first rotating connection component (3) includes two connecting discs (31), which are fixedly connected by multiple fasteners (32). One of the connecting discs (31) is fitted with a pin (33). An insulator (7) supporting the busbar (2) is installed inside the cable tray (1). The insulator (7) is provided with a pin hole (34) that is rotatably connected to the pin (33).

4. A prefabricated high and low voltage busbar bridge according to claim 3, characterized in that, Each of the connecting discs (31) is rotatably mounted with multiple support wheels (35), and one of the connecting discs (31) is provided with a receiving hole (36) for the insulator (7) to pass through.

5. A prefabricated high and low voltage busbar bridge according to claim 4, characterized in that, A second rotating connecting component (5) is rotatably installed between the telescopic row (23) and the straightening row (24). The structure of the second rotating connecting component (5) is the same as that of the first rotating connecting component (3). The connecting plate (31) is located on both sides of the third circular connecting part (231) and the fourth circular connecting part (241).

6. A prefabricated high and low voltage busbar bridge according to claim 5, characterized in that, A second limiting connection component (6) is installed between the straightening row (24) and the corner row (25). The structure of the second limiting connection component (6) is the same as that of the first limiting connection component (4). The pressure plate (41) is located on both sides of the straightening row (24) and the corner row (25).

7. A prefabricated high and low voltage busbar bridge according to claim 6, characterized in that, An insulating support frame (8) for supporting the insulator (7) is fixedly installed inside the cable tray (1). The insulating support frame (8) is provided with a sliding groove (81). A slider (82) is slidably installed in the sliding groove (81). The insulator (7) is rotatably connected to the slider (82). A positioning component (83) for limiting the position of the slider (82) is installed on the insulating support frame (8). The positioning component (83) includes a limiting cylinder (831) fixedly installed on an insulating support frame (8). A sealing plate (832) is slidably installed inside the limiting cylinder (831). A sealing ring (833) is fixedly installed on the sealing plate (832). A traction rod (834) fixedly connected to the slider (82) is fixedly installed on the sealing plate (832). The two ends of the limiting cylinder (831) are connected through a conveying pipe (835). A valve (836) is fixedly installed on the conveying pipe (835). Both the limiting cylinder (831) and the conveying pipe (835) are filled with hydraulic medium.

8. A prefabricated high and low voltage busbar bridge according to claim 7, characterized in that, The cable tray (1) includes multiple modularly configured cable boxes (11). Each cable box (11) includes a support frame (111) and sheet metal parts (112) fixedly installed on the support frame (111). The support frame (111) is provided with multiple connection holes (113). Two adjacent cable boxes (11) are fixedly connected through the connection holes (113) and connectors. A slider (114) is slidably mounted on one of the bridge boxes (11).

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