A cable distribution box transition device for extension of a subway main substation

Abstract

The utility model relates to cable distribution box technical field, specifically is a kind of cable distribution box transition device for subway main substation extension, including cabinet, gas storage box, fixed plate and cover plate, the rectangular array distribution of the cabinet lower end outer wall is equipped with wiring port, the wiring board is installed in the cabinet inner wall upper end one side, the fixed plate of rectangular array distribution is screw-connected in the cabinet lower end outer wall both sides, movable mounting is carried out in the fixed plate inside movable rod, the movable rod one end outer wall is installed with clamping plate, the cabinet both sides outer wall are rotationally linked with cabinet door, the cabinet door lower end outer wall is provided with gas storage box, the gas storage box one side outer wall is provided with cover plate, movable rod is movably installed in the cover plate both sides outer wall, movable rod one end outer wall is installed with push plate, the purpose of pre-clamping cable is realized, avoid the need to support when cable and wiring board assembly, reduce the work intensity of staff, and can improve the assembly efficiency of cable.

Description

Technical Field

[0001] This utility model relates to the field of cable junction box technology, specifically to a transition device for a cable junction box used in the expansion of a subway main substation. Background Technology

[0002] The main substation is a key part of the subway power supply system. It is used to transform the high voltage input from the urban power grid into medium voltage suitable for the internal power supply system of the subway to meet the power demand of various subway equipment. The stepped-down power is then distributed to various subway substations, including traction substations and step-down substations, to provide power for the subway's traction system, power and lighting system, etc. During the expansion of the main substation, the cables need to be transitioned through cable junction boxes to ensure the continuity of power supply to related equipment inside the subway.

[0003] A cable junction box is an electrical device used in power systems to split and transfer cables. It can distribute the electrical energy of one cable to multiple cables, enabling power supply to multiple electrical devices or branch lines. It can also be used to change the route of cables, connect cables of different specifications or types, and make intermediate connections in cable lines.

[0004] While existing cable junction boxes offer numerous advantages during use, they still suffer from the following problems: their lack of support structure for cables necessitates manual support of the cables during connection to the joints, resulting in low connection efficiency and poor subsequent energization and connection strength. Utility Model Content

[0005] To address the problems in the existing technology, this utility model provides a cable junction box transition device for the expansion of a subway main substation.

[0006] The technical solution adopted by this utility model to solve its technical problem is a cable junction box transition device for the expansion of a subway main substation, including a cabinet, an air storage box, a fixing plate, and a cover plate. The lower outer wall of the cabinet has a rectangular array of cable routing openings. A wiring plate is installed on one side of the upper inner wall of the cabinet. The lower outer wall of the cabinet is screwed to both sides of the rectangular array of fixing plates. A movable rod is movably installed inside the fixing plate. A clamping plate is installed on the outer wall of one end of the movable rod. Cabinet doors are rotatably connected to both outer walls of the cabinet. An air storage box is provided on the lower outer wall of the cabinet door. A cover plate is provided on one outer wall of the air storage box. Piston rods are movably installed on both outer walls of the cover plate. A push plate is installed on the outer wall of one end of the piston rod.

[0007] By adopting the above technical solution, multiple cable routing ports are used to distinguish the cable entry positions in the cabinet, facilitating the subsequent assembly of cables with the junction box. The junction box provides a fixed position for cable connection and can meet the purpose of cable branching. The cabinet door can shield the interior of the cabinet, protect the electrical components inside, and facilitate the inspection or maintenance of the cabinet interior by the staff. When the staff inserts the cable into the cabinet from below the cable routing port, the support spring applies a pushing force to the clamping plate on the outer protective layer of the cable, and together with the support plate, achieves the purpose of pre-clamping the cable, avoiding the need for support when assembling the cable with the junction box, reducing the workload of the staff, and improving the cable assembly efficiency. Furthermore, when the cabinet door is closed, the push plate further compresses and fixes the movable rod, ensuring the stability of the clamping plate's clamping and fixing of the cable, providing additional support for the cable, and improving the firmness of the cable's energized connection.

[0008] Specifically, the lower outer wall of the cabinet is welded with equally spaced parallel support plates. The support plates and clamping plates are positioned opposite each other and are distributed on both sides of the lower end of the cable routing port. The outer walls of the support plates and clamping plates on opposite sides are designed with an arc shape, and protective pads are glued and fixed to the outer walls of the support plates and clamping plates on opposite sides.

[0009] By adopting the above technical solution, the clamping plate uses the elastic force of the support spring to squeeze the outer wall of the cable inside the cable routing port, and works with the support plate to achieve synchronous support for the cable in the left and right directions. The arc shape can better fit the shape of the cable, reducing damage to the cable, and the presence of the protective pad further enhances the protection of the cable and prevents the cable sheath from being scratched.

[0010] Specifically, a support spring is sleeved on one side of the outer wall of the movable rod. The two ends of the support spring are in contact with the outer side of the fixed plate and the outer wall of one side of the movable rod, respectively. The movable rod is elastically connected to the fixed plate through the support spring. The outer wall of one end of the push plate is in contact with the outer wall of the movable rod.

[0011] By adopting the above technical solution, when the cable thickness is different, the support spring can adaptively adjust the position of the clamping plate to ensure that a suitable clamping force is applied to the cable, and the elastic force of the support spring can support the clamping plate to maintain the clamping force of the clamping plate on the cable continuously and stably.

[0012] Specifically, the upper outer wall of the gas storage box is equipped with fixing brackets on both sides, and the gas storage box is connected to the lower outer wall of the cabinet door with screws through the fixing brackets.

[0013] By adopting the above technical solution, the fixing frame not only ensures the firmness of the gas storage box installation, preventing it from easily shaking or falling off during equipment operation, but also facilitates the disassembly and replacement of the gas storage box when needed.

[0014] Specifically, the air storage box has an air inlet pipe and an exhaust pipe welded to the outer walls on both sides of the cover plate. Both the air inlet pipe and the exhaust pipe are connected to the inside of the air storage box. The outer side of the air inlet pipe is threaded with a one-way valve to restrict the airflow direction, and the exhaust pipe is threaded with a pressure relief valve to limit the pressure.

[0015] By adopting the above technical solution, the one-way valve restricts the airflow direction, ensuring that only when the push plate moves away from the movable rod, the elastic force of the return spring pushes the push plate and piston rod to move and reset. When the piston plate moves accordingly, the air storage box draws external gas into the air storage box through the air inlet pipe, avoiding gas backflow. The pressure relief valve is used to limit the pressure inside the air storage box. As the cabinet door closes, the push plate contacts the outer wall of the movable rod, and at this time, the piston plate moves relative to the inside of the air storage box, compressing the gas inside the air storage box. Through the air pressure supporting the piston plate and push plate, the squeezing force of the push plate on the piston rod and clamping plate is maintained, ensuring the clamping stability of the cable. When the pressure in the air storage box exceeds the set value of the pressure relief valve, the pressure relief valve will automatically open to release the pressure, preventing the clamping plate from damaging the outer wall of the cable due to excessive pressure.

[0016] Specifically, both the gas storage box and the outer wall of the cover are equipped with connectors arranged in a rectangular array, and the gas storage box and the cover are connected by screws of the connectors.

[0017] By adopting the above technical solution, the connector ensures the stability of the connection between the gas storage box and the cover plate, and enables a reliable connection between the two. It also facilitates the disassembly of the cover plate and the disassembly and maintenance of the piston plate by the staff.

[0018] Specifically, a piston plate is screwed to the outer wall of one end of the piston rod, which is different from the push plate. The piston plate is located inside the gas storage box. A sealing ring is bonded and fixed to the outer wall of the piston plate. The sealing ring is in contact with the inner wall of the gas storage box. A return spring is sleeved on one side of the outer wall of the piston rod. The two ends of the return spring are in contact with the outer walls of the cover plate and the push plate, respectively. The push plate is elastically connected to the cover plate through the return spring.

[0019] By adopting the above technical solution, the piston plate and sealing ring ensure the sealing performance of the gas storage box and prevent gas leakage. When the push plate loses the restriction of the movable rod, the return spring can push the plate back to its original position, driving the gas storage box to draw in air through the air inlet pipe. The movement stroke of the piston rod and piston plate is used to adapt to different movable rod positions, thereby adapting to different cable diameters and maintaining the same clamping pressure on cables of different sizes.

[0020] The beneficial effects of this utility model are:

[0021] (1) The cable junction box transition device for the expansion of the main substation of the subway described in this utility model provides a support spring that pushes the clamping plate onto the protective layer outside the cable, and works with the support plate to achieve the purpose of pre-clamping the cable, avoiding the need for support when assembling the cable with the terminal block, reducing the workload of the staff, and improving the assembly efficiency of the cable.

[0022] (2) The cable junction box transition device for the expansion of the main substation of the subway described in this utility model has a push plate to further squeeze and fix the movable rod, which ensures the stability of the clamping plate for the cable, provides additional support for the cable, and improves the power connection of the cable. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the main body of the cabinet structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the cabinet structure of this utility model.

[0026] Figure 3 This is an exploded view of the fixing plate structure of this utility model;

[0027] Figure 4 This is an exploded view of the gas storage box structure of this utility model.

[0028] In the diagram: 1. Cabinet body; 11. Cabinet door; 12. Cable routing port; 13. Terminal block; 14. Support plate; 2. Air storage box; 21. Air inlet pipe; 22. Exhaust pipe; 23. Fixing bracket; 24. Connector; 3. Fixing plate; 31. Movable rod; 32. Support spring; 33. Clamping plate; 34. Protective pad; 4. Cover plate; 41. Piston rod; 42. Piston plate; 43. Push plate; 44. Return spring. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0030] To save manpower and improve efficiency, as one embodiment of this utility model, such as Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the present invention discloses a cable junction box transition device for the expansion of a subway main substation, comprising a cabinet 1, an air storage box 2, a fixing plate 3, and a cover plate 4. The lower outer wall of the cabinet 1 has a rectangular array of cable routing ports 12. A wiring plate 13 is installed on one side of the upper inner wall of the cabinet 1. The lower outer wall of the cabinet 1 is screwed to both sides of the rectangular array of fixing plates 3. A movable rod 31 is movably installed inside the fixing plate 3. A clamping plate 33 is installed on the outer wall of one end of the movable rod 31. Cabinet doors 11 are rotatably connected to both outer walls of the cabinet 1. An air storage box 2 is provided on the lower outer wall of the cabinet door 11. A cover plate 4 is provided on one outer wall of the air storage box 2. A piston rod 41 is movably installed on both outer walls of the cover plate 4. A push plate 43 is installed on the outer wall of one end of the piston rod 41.

[0031] In use, the multi-point cable routing ports 12 are used to distinguish the cable entry positions in the cabinet, facilitating the subsequent assembly of cables with the junction box 13. The junction box 13 provides a fixed position for cable connection and can meet the purpose of cable splitting. The cabinet door 11 can shield the interior of the cabinet 1, protect the electrical components inside the cabinet 1, and facilitate the inspection or maintenance of the interior of the cabinet 1 by the staff. When the staff inserts the cable into the interior of the cabinet 1 from under the cable routing port 12, the support spring 32 applies a pushing force to the clamping plate 33 on the outer protective layer of the cable, and together with the support plate 14, achieves the purpose of pre-clamping the cable, avoiding the need for support when assembling the cable with the junction box 13, reducing the workload of the staff, and improving the cable assembly efficiency. When the cabinet door 11 is closed, the push plate 43 further squeezes and fixes the movable rod 31, ensuring the stability of the clamping plate 33 in clamping and fixing the cable, providing additional support for the cable, and improving the firmness of the cable's power connection.

[0032] For pre-clamping, for example, such as Figure 3 As shown, the lower outer wall of the cabinet 1 is welded with equally spaced parallel support plates 14. The support plates 14 and clamping plates 33 are positioned opposite each other and are distributed on both sides of the lower end of the cable routing port 12. The outer walls of the support plates 14 and clamping plates 33 on opposite sides are designed with an arc shape. Protective pads 34 are glued and fixed to the outer walls of the support plates 14 and clamping plates 33 on opposite sides.

[0033] During use, the clamping plate 33 presses the outer wall of the cable inside the cable routing port 12 with the elastic force of the support spring 32, and works with the support plate 14 to achieve synchronous support for the cable in the left and right directions. The arc shape can better fit the shape of the cable, reducing damage to the cable. The presence of the protective pad 34 further enhances the protection of the cable and prevents the cable sheath from being scratched.

[0034] To maintain pre-clamping force, for example, such as Figure 3As shown, a support spring 32 is sleeved on one side of the outer wall of the movable rod 31. The two ends of the support spring 32 are in contact with the outer side of the fixed plate 3 and the outer wall of one side of the movable rod 31, respectively. The movable rod 31 is elastically connected to the fixed plate 3 through the support spring 32. The outer wall of one end of the push plate 43 is in contact with the outer wall of the movable rod 31.

[0035] When in use, when the cable thickness is different, the support spring 32 can adaptively adjust the position of the clamping plate 33 to ensure that a suitable clamping force is applied to the cable, and the elastic force of the support spring 32 can support the clamping plate 33, keeping the clamping force of the clamping plate 33 on the cable continuous and stable.

[0036] To maintain a stable position, for example, such as Figure 4 As shown, the upper outer wall of the gas storage box 2 is equipped with a fixing bracket 23 on both sides, and the gas storage box 2 is connected to the lower outer wall of the cabinet door 11 by screws through the fixing bracket 23.

[0037] When in use, the fixing frame 23 not only ensures the firmness of the gas storage box 2 installation, so that it will not easily shake or fall off during equipment operation, but also facilitates the disassembly and replacement of the gas storage box 2 when needed.

[0038] For the purpose of air intake and exhaust, for example, such as Figure 4 As shown, the air storage box 2 is welded to the outer walls on both sides of the cover plate 4 with an air inlet pipe 21 and an exhaust pipe 22 respectively. Both the air inlet pipe 21 and the exhaust pipe 22 are connected to the inside of the air storage box 2. The outer side of the air inlet pipe 21 is threaded with a one-way valve to restrict the airflow direction, and the exhaust pipe 22 is threaded with a pressure relief valve to limit the pressure.

[0039] During use, the one-way valve restricts the airflow direction, ensuring that only when the push plate 43 moves away from the movable rod 31, the spring force of the return spring 44 pushes the push plate 43 and piston rod 41 to move and reset. When the piston plate 42 moves accordingly, the air storage box 2 draws in external gas through the air inlet pipe 21 to prevent gas backflow. The pressure relief valve is used to limit the pressure inside the air storage box 2. As the cabinet door 11 closes, the push plate 43 contacts the outer wall of the movable rod 31. At this time, the piston plate 42 moves relative to the air storage box 2, compressing the gas inside the air storage box 2. The air pressure supports the piston plate 42 and the push plate 43, maintaining the squeezing force of the push plate 43 on the piston rod 41 and the clamping plate 33, ensuring the clamping stability of the cable. When the pressure in the air storage box 2 exceeds the set value of the pressure relief valve, the pressure relief valve will automatically open to release the pressure, preventing the clamping plate 33 from damaging the outer wall of the cable due to excessive pressure.

[0040] To maintain the usage location, for example, such as Figure 4 As shown, both the gas storage box 2 and the cover plate 4 are equipped with connectors 24 arranged in a rectangular array on their outer walls, and the gas storage box 2 and the cover plate 4 are connected by screws through the connectors 24.

[0041] During use, the connector 24 ensures the stability of the connection between the gas storage box 2 and the cover plate 4, and enables a reliable connection between the two, making it easy for staff to disassemble the cover plate 4 and to disassemble and maintain the piston plate 42.

[0042] To control the clamping pressure, for example, such as Figure 4 As shown, a piston plate 42 is screwed to the outer wall of the piston rod 41, which is different from the push plate 43. The piston plate 42 is located inside the gas storage box 2. A sealing ring is glued and fixed to the outer wall of the piston plate 42. The sealing ring is in contact with the inner wall of the gas storage box 2. A return spring 44 is sleeved on one side of the outer wall of the piston rod 41. The two ends of the return spring 44 are in contact with the outer walls of the cover plate 4 and the push plate 43, respectively. The push plate 43 is elastically connected to the cover plate 4 through the return spring 44.

[0043] During use, the piston plate 42 and the sealing ring ensure the sealing performance of the gas storage box 2 and prevent gas leakage. When the push plate 43 loses the restriction of the movable rod 31, the return spring 44 can push the plate 43 back to its original position, driving the gas storage box 2 to draw in air through the air inlet pipe 21. The movement stroke of the piston rod 41 and the piston plate 42 is used to adapt to different positions of the movable rod 31, thereby adapting to different cable diameters and maintaining the same clamping pressure on cables of different sizes.

[0044] When using this utility model, the operator inserts the cable into the cabinet 1 from below the cable routing port 12 on the lower outer wall of the cabinet 1. At this time, the support spring 32 gives the clamping plate 33 a pushing force in the direction of the cable, so that the clamping plate 33 squeezes the protective layer on the outside of the cable. At the same time, the support plate 14 corresponding to the position of the clamping plate 33 supports the cable from the other side, realizing synchronous pre-clamping of the cable in the left and right directions. After this step is completed, the cable can remain relatively stable without manual support, which is convenient for subsequent assembly with the terminal block 13.

[0045] With the cable in the pre-clamped state, the operator can connect the cable to the terminal block 13 on the upper side of the inner wall of cabinet 1 to achieve cable splitting;

[0046] After assembling the cable and junction box 13, close the cabinet doors 11 on both sides of the cabinet body 1. The air storage box 2 set on the lower outer wall of the cabinet door 11 moves with the cabinet door 11. When the cabinet door 11 is completely closed, the push plate 43 on the air storage box 2 contacts the outer wall of the movable rod 31 and further squeezes the movable rod 31. After one end of the outer wall of the push plate 43 contacts the movable rod 31, it pushes the movable rod 31 to continue moving against the elastic force of the support spring 32, thereby increasing the clamping force of the clamping plate 33 on the cable.

[0047] During the process of the push plate 43 pressing the movable rod 31, the piston rod 41 connected to the push plate 43 drives the piston plate 42 to move relative to each other inside the air storage box 2. When the piston plate 42 moves, it compresses the gas inside the air storage box 2, causing the air pressure inside the air storage box 2 to increase. The one-way valve on the outside of the air inlet pipe 21 restricts the airflow direction, ensuring that only when the push plate 43 moves away from the movable rod 31, and the return spring 44 pushes the push plate 43 and the piston rod 41 to move back to their original position, and the piston plate 42 moves accordingly, does the air storage box 2 draw in external gas through the air inlet pipe 21, thus preventing gas backflow. When the pressure inside the air storage box 2 exceeds the set value of the pressure relief valve, the pressure relief valve automatically opens to release the pressure, allowing the gas inside the air storage box 2 to be discharged through the exhaust pipe 22, preventing the clamping plate 33 from damaging the cable due to excessive pressure. The air pressure supports the piston plate 42 and the push plate 43, maintaining the compressive force exerted by the push plate 43 on the piston rod 41 and the clamping plate 33.

[0048] When the push plate 43 is opened as the cabinet door 11 rotates, the push plate 43 is no longer restricted by the movable rod 31, and the return spring 44 can push the push plate 43 to return to its original position, causing the air storage box 2 to draw in air through the air inlet pipe 21, preparing for the pressure adjustment when the cabinet door 11 closes again.

[0049] It should be noted that this utility model is a cable junction box transition device for the expansion of a subway main substation. All components in this utility model are known to those skilled in the art, and their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A cable junction box transition device for the expansion of a subway main substation, characterized in that, The cabinet includes a cabinet (1), an air storage box (2), a fixing plate (3), and a cover plate (4). The lower outer wall of the cabinet (1) has a rectangular array of cable outlets (12). A wiring plate (13) is installed on one side of the upper inner wall of the cabinet (1). The lower outer wall of the cabinet (1) is screwed to both sides of the fixing plate (3) with a rectangular array of fixing plates (3). A movable rod (31) is movably installed inside the fixing plate (3). A clamping plate (33) is installed on the outer wall of one end of the movable rod (31). Cabinet doors (11) are rotatably connected to both outer walls of the cabinet (1). An air storage box (2) is provided on the lower outer wall of the cabinet door (11). A cover plate (4) is provided on one side of the outer wall of the air storage box (2). A piston rod (41) is movably installed on both outer walls of the cover plate (4). A push plate (43) is installed on the outer wall of one end of the piston rod (41).

2. The cable junction box transition device for the expansion of a subway main substation according to claim 1, characterized in that, The lower outer wall of the cabinet (1) is welded with equally spaced parallel support plates (14). The support plates (14) and clamping plates (33) are positioned opposite each other and are distributed on both sides of the lower end of the cable routing port (12). The outer walls of the support plates (14) and clamping plates (33) on opposite sides are designed with an arc shape. Protective pads (34) are glued and fixed to the outer walls of the support plates (14) and clamping plates (33) on opposite sides.

3. The cable junction box transition device for the expansion of a subway main substation according to claim 1, characterized in that, A support spring (32) is sleeved on one side of the outer wall of the movable rod (31). The two ends of the support spring (32) are in contact with the outer side of the fixed plate (3) and the outer wall of one side of the movable rod (31), respectively. The movable rod (31) is elastically connected to the fixed plate (3) through the support spring (32). The outer wall of one end of the push plate (43) is in contact with the outer wall of the movable rod (31).

4. A cable junction box transition device for the expansion of a subway main substation according to claim 1, characterized in that, The upper outer wall of the gas storage box (2) is equipped with a fixing bracket (23) on both sides, and the gas storage box (2) is connected to the lower outer wall of the cabinet door (11) by screws through the fixing bracket (23).

5. A cable junction box transition device for the expansion of a subway main substation according to claim 1, characterized in that, The air storage box (2) is welded with an air inlet pipe (21) and an exhaust pipe (22) on the outer walls of both sides of the cover plate (4). The air inlet pipe (21) and the exhaust pipe (22) are connected to the inside of the air storage box (2). The outer side of the air inlet pipe (21) is threaded with a one-way valve that restricts the airflow direction. The exhaust pipe (22) is threaded with a pressure relief valve that restricts the pressure.

6. A cable junction box transition device for the expansion of a subway main substation according to claim 1, characterized in that, The outer walls of the gas storage box (2) and the cover plate (4) are equipped with connectors (24) arranged in a rectangular array, and the gas storage box (2) and the cover plate (4) are connected by screws through the connectors (24).

7. A cable junction box transition device for the expansion of a subway main substation according to claim 1, characterized in that, The piston rod (41) is connected to a piston plate (42) by screws on one end of the outer wall of the push plate (43). The piston plate (42) is located inside the gas storage box (2). A sealing ring is glued and fixed to the outer wall of the piston plate (42). The sealing ring is in contact with the inner wall of the gas storage box (2). A return spring (44) is sleeved on one side of the outer wall of the piston rod (41). The two ends of the return spring (44) are in contact with the outer walls of the cover plate (4) and the push plate (43) respectively. The push plate (43) is elastically connected to the cover plate (4) through the return spring (44).

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