Protective power distribution device for power grid

Abstract

The present application relates to the technical field of drawer type power distribution cabinet, especially to a protective power distribution device for power grid, which comprises a power distribution cabinet body, internal connection electric unit blocks and drawer box bodies, the drawer box bodies are provided in plurality, the plurality of drawer box bodies are slidingly installed inside the power distribution cabinet body, the internal connection electric unit blocks are provided in equal number with the drawer box bodies, the plurality of internal connection electric unit blocks are respectively and correspondingly installed through the inside of the plurality of drawer box bodies, and each internal connection electric unit block is provided with an external connection electric unit block at one end outside the drawer box body. The present application can set conductive beads and ball core rods between the power connection rods of the external connection electric unit blocks and the fixed power connection frame body, convert the sliding friction between the traditional power connection structures into the rolling friction of the conductive beads, greatly reduce the mechanical wear of the power connection components in the plugging process, effectively solve the poor contact problem caused by long-term friction, and significantly improve the conductive stability and service life of the power connection unit.

Description

Technical Field

[0001] This invention relates to the technical field of drawer-type distribution cabinets, and in particular to a protective distribution device for power grids. Background Technology

[0002] With the construction of my country's 750 kV and above AC transmission backbone network and the continuous improvement of the large-scale power grid security and defense system, the intelligent dispatching system has put forward stringent requirements on the continuity and reliability of power supply to power terminals. The safe operation of the power grid not only depends on the stability of high-voltage transmission lines and macro-dispatch systems, but also on the efficient cooperation of the underlying power distribution terminal equipment. As the most widely used modular core unit in the current power distribution network, the long-term stability of its electrical contact is crucial to ensuring the power supply quality of converter station power systems and key industrial loads. It is the cornerstone for ensuring the stable operation of the entire power grid security defense system at the end.

[0003] However, existing drawer-type distribution cabinets typically use a plug-in connection structure. During daily operation and maintenance, the metal parts connected to the power supply will experience continuous sliding friction as the drawer unit is pushed and pulled in and out. This mechanical wear, accumulated over a long period of operation, can easily lead to oxidation of the contact surface, a sharp increase in contact resistance, and in turn cause faults such as contact overheating, poor contact, or even instantaneous power outage.

[0004] From a traditional perspective, wear and tear on such end components may be considered as local equipment failure. However, in a large-scale power grid security defense system, instability in end-point contact will directly interfere with the intelligent dispatch system's accurate location and isolation judgment of power grid faults. Once the underlying distribution terminal experiences an unexpected power outage due to contact wear, it will not only cause the power load to shut down, but may also disrupt the targeted response of the power grid fault isolation strategy, weakening the overall disaster resistance resilience and dispatch flexibility of the power supply system.

[0005] Therefore, a protective distribution device for power grids is proposed to solve the above problems. Summary of the Invention

[0006] To address the problems mentioned in the background art, the present invention provides a protective power distribution device for power grids.

[0007] This invention provides a protective power distribution device for power grids, employing the following technical solution: It includes a distribution cabinet and multiple drawer boxes, which are slidably installed inside the distribution cabinet. The device also includes: The internal power supply unit blocks are arranged in the same number as the drawer boxes. Multiple internal power supply unit blocks are installed one-to-one through the inside of multiple drawer boxes. Each internal power supply unit block is provided with an external power supply unit block at one end of the drawer box. The external power supply unit block is installed inside the power distribution cabinet. The end of the external power supply unit block near the internal power supply unit block has multiple power supply rod-like structures.

[0008] A movable frame is provided between the external power unit block and the internal power unit block. The movable frame is elastically connected to the adjacent drawer box. Each power rod of the external power unit block is sleeved with a fixed power frame, which is connected to the adjacent internal power unit block.

[0009] The external power unit block has a flexible telescopic connecting unit between its power receiving rod and the fixed power receiving frame on the outside, and the connecting unit is connected to the movable frame.

[0010] The drawer body is equipped with a manually driven component that pulls the movable frame closer to the drawer body.

[0011] Optionally, the fixed power connection frame includes a circular ring and multiple inner arc-shaped inclined plates. The circular ring is connected to the inner power connection unit block, and the inner arc-shaped inclined plates are fixed to the circular ring. The distance between the inner arc-shaped inclined plates and the axis of the circular ring gradually increases. The power connection rod of the outer power connection unit block is coaxially arranged with the adjacent circular ring. The multiple inner arc-shaped inclined plates are evenly distributed in a circumferential array around the axis of the circular ring.

[0012] Optionally, the interconnecting unit includes multiple conductive beads and multiple ball-shaped rods, with the number of ball-shaped rods equal to that of the conductive beads. The ball-shaped rods are installed through the center of the conductive beads, and the conductive beads are fitted against the inner arc-shaped inclined plate near the axis of the circular ring. Tension-expanding plates are installed at both ends of the ball-shaped rods, and the ball-shaped rods can rotate relative to the tension-expanding plates. The end of the tension-expanding plate away from the axis of the adjacent circular ring is connected to the movable frame.

[0013] Optionally, the manual drive assembly includes two tension drive units.

[0014] The tension drive unit includes a tension rope, a winding shaft, and a side shaft. The side shaft is arranged perpendicularly to the winding shaft. A cavity is provided inside the drawer body for mounting the winding shaft and the side shaft. One end of the tension rope is connected to the winding shaft, and the other end of the tension rope slides through the inner wall of the drawer body and is connected to an adjacent movable frame.

[0015] The inner side of the winding shaft is provided with a double-segment rotating shaft, the two ends of which can rotate relative to each other. Both ends of the winding shaft are coaxially mounted with inner rib sleeves, and both ends of the double-segment rotating shaft are sleeved with inner rib shafts. One of the two inner rib shafts is coaxially slidably inserted into the inner side of the adjacent inner rib sleeve. Both inner rib shafts are slidably sleeved with short shafts on their outer sides. The short shafts are rotatably installed inside the drawer body. Both short shafts are coaxially mounted with driven bevel gears on their outer surfaces. The outer surface of the side shaft is coaxially mounted with a driving bevel gear, and the driving bevel gear meshes with the adjacent driven bevel gear.

[0016] Optionally, each double-segment rotating shaft is provided with a tensioning bevel gear on the side away from the driving bevel gear. The tensioning bevel gear meshes with the adjacent driven bevel gear. Each tensioning bevel gear is coaxially mounted with a central shaft that can rotate relative to it. The central shaft rotates through the inner wall of the drawer body, and the tensioning bevel gear and the central shaft are elastically torsional connected.

[0017] Optionally, each central axis and side axis is coaxially mounted with a rib at one end of the outer side of the drawer body. A transmission rib sleeve is slidably sleeved on the outer side of the rib, and a locking rib ring is slidably sleeved on the outer side of the transmission rib sleeve. The locking rib ring is connected to the outer side of the drawer body.

[0018] Optionally, a torsion swing plate is installed at the end of the transmission sleeve away from the drawer body, and two linkage plates are provided on the outside of the drawer body. The two torsion swing plates connected to the two ribs corresponding to the two central shafts on the inside of the drawer body and the two ribs corresponding to the two side shafts are respectively rotatably connected to the two ends of the same linkage plate.

[0019] Optionally, a position control plate is provided inside the drawer body. The upper and lower ends of the position control plate are rotatably sleeved on the outer surfaces of two double-segment rotating shafts. A threaded shaft is threaded through the end face of the position control plate. The threaded shaft is rotatably inserted into the inside of the drawer body. A long shaft is provided inside the drawer body, perpendicular to the threaded shaft. One end of the long shaft is driven to the threaded shaft through a bevel gear meshing assembly, and the other end of the long shaft rotatably passes through the inner wall of the drawer body.

[0020] Optionally, a prismatic telescopic rod is coaxially mounted on one end of the long shaft on the outside of the drawer body, and a locking prismatic sleeve is mounted on the outside of the drawer body. The locking prismatic sleeve is coaxially arranged with the prismatic telescopic rod, and the inner side of the locking prismatic sleeve is adapted to the large diameter end of the prismatic telescopic rod.

[0021] Optionally, the two torsion swing plates connected by the linkage plate are arranged in parallel, and the rib connected to the torsion swing plate and the linkage plate are respectively located at both ends of the torsion swing plate.

[0022] In summary, the present invention has the following beneficial technical effects: 1. This invention transforms the sliding friction between traditional connection structures into rolling friction of conductive beads by setting conductive beads and a ball-shaped rod between the connection rod of the external connection unit block and the fixed connection frame. This greatly reduces the mechanical wear of the connection components during the insertion and removal process, effectively solves the problem of poor contact caused by long-term friction, significantly improves the conductivity stability and service life of the connection unit, and provides a basic guarantee for the reliability of terminal power supply under a large-scale power grid security defense system.

[0023] 2. This invention, through the flexible connection of the movable frame and the inner arc-shaped inclined plate structure, realizes the power-on and power-off of the connection and pull-out actions. During the movement of the drawer, the conductive beads and the power-connecting rod automatically separate and disconnect the power, avoiding ineffective friction of the power-connecting rod when the drawer moves. Only after the drawer is fully pushed into place, the conductive beads are moved towards the axis by the manual drive component to achieve tight power connection. This achieves the protection effect of power-off without wear during movement and power connection during stillness, significantly reducing the fluctuation of the end circuit caused by improper operation and ensuring the operation and maintenance safety of the power grid's underlying equipment.

[0024] 3. This invention, through the combined design of a double-segment rotating shaft, an inner rib shaft, and an inner rib sleeve, and the switching of the transmission path by a position control plate, achieves elastic force compensation after power connection. After the conductive bead contacts the power connection rod, a continuous elastic tension is applied to the movable frame through the tension bevel gear and the torsion spring structure on the central shaft. This not only ensures that the contact pressure between the conductive bead, the power connection rod, and the fixed frame is constant, preventing loosening of the contact due to vibration, but also facilitates precise control of the magnitude of the power connection pressure, further improving the stability of power supply.

[0025] 4. This invention achieves synchronous driving and position locking of dual side shafts or dual center shafts through the cooperation of structures such as linkage plate, transmission sleeve and locking ring. The operator only needs to move the linkage plate to control the twisting swing plates on both sides at the same time. After power is connected, the transmission sleeve is inserted into the locking ring to fix the rotation angle of the rod and the transmission sleeve, preventing power failure caused by misoperation, and greatly improving the convenience and safety of multi-circuit drawer unit operation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present invention; Figure 2 This is a schematic diagram of the drawer body in an embodiment of the present invention; Figure 3 This is a schematic diagram of the rear axle side structure of the drawer body in an embodiment of the present invention; Figure 4 This is a schematic diagram of the distribution of the drawer body and the winding shaft in an embodiment of the present invention; Figure 5 This is a side view schematic diagram of some structures in an embodiment of the present invention; Figure 6 This is a schematic diagram of the distribution of the winding shaft and the central shaft in an embodiment of the present invention; Figure 7 This is an exploded view of some structures in an embodiment of the present invention; Figure 8 This is a schematic diagram of the distribution of the double-segment rotating shaft and the inner rib sleeve in an embodiment of the present invention; Figure 9 This is a schematic diagram of the distribution of the fixed power connection frame and the movable frame in an embodiment of the present invention; Figure 10 This is a schematic diagram of the distribution of the circular ring and the inner arc-shaped inclined plate in an embodiment of the present invention; Figure 11 This is a schematic diagram of the distribution of the interconnected units in an embodiment of the present invention.

[0027] Reference numerals in the attached diagram: 1. Distribution cabinet; 2. Drawer box; 3. Internal power connection unit block; 4. External power connection unit block; 5. Movable frame; 6. Fixed power connection frame; 61. Ring; 62. Inner arc-shaped inclined plate; 7. Connecting unit; 71. Conductive bead; 72. Ball-shaped rod; 73. Tension telescopic plate; 8. Manual drive assembly; 9. Tension drive unit; 91. Tension rope; 92. Winding shaft; 93. Side shaft; 94. Double-segment rotating shaft; 941. Position control plate; 942, threaded shaft; 943, long shaft; 944, bevel gear meshing assembly; 945, prismatic telescopic rod; 946, locking prismatic sleeve; 95, inner prismatic sleeve; 96, inner prismatic shaft; 97, short shaft; 98, driven bevel gear; 99, driving bevel gear; 910, tensioning bevel gear; 911, central shaft; 912, prismatic rod; 913, transmission prismatic sleeve; 914, locking prismatic ring; 915, torsion swing plate; 916, linkage plate. Detailed Implementation

[0028] 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 a part of the embodiments of this application, and not all of the 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.

[0029] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0030] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0032] The following is in conjunction with the appendix Figures 1-11 The present invention will be described in further detail below.

[0033] This invention discloses a protective power distribution device for power grids. For example... Figures 1-11 As shown, it includes a power distribution cabinet 1, an internal power connection unit block 3, and a drawer box 2. Multiple drawer boxes 2 are provided, and multiple drawer boxes 2 are slidably installed inside the power distribution cabinet 1.

[0034] In this embodiment, power cables are installed inside the power distribution cabinet 1. The cables are installed on the top or back of the cabinet, and the vertical branch busbar is behind the drawer. The cable ends are made of copper-plated tin material. Electrical components are installed inside the drawer cabinet 2.

[0035] The number of internal power supply unit blocks 3 is equal to that of drawer boxes 2. Multiple internal power supply unit blocks 3 are installed one-to-one through the inside of multiple drawer boxes 2. Each internal power supply unit block 3 is provided with an external power supply unit block 4 at one end of the drawer box 2. The external power supply unit block 4 is installed inside the power distribution cabinet 1. The end of the external power supply unit block 4 near the internal power supply unit block 3 has multiple power supply rod-shaped structures.

[0036] In this embodiment, the inner power unit block 3 has a contact end located on the outside of the drawer body 2, and an inner power board is installed on the inside of the drawer body 2 for cable connection with the electrical components inside the drawer body 2. The power rod of the outer power unit block 4 is made of conductive material, and the outer power unit block 4 is connected to the bus cable inside the drawer body 2.

[0037] A movable frame 5 is provided between the external power unit block 4 and the internal power unit block 3. The movable frame 5 is elastically connected to the adjacent drawer box 2. Preferably, the movable frame 5 and the drawer box 2 are connected by an elastic telescopic rod in a compressed state, which pushes the movable frame 5 to move away from the drawer box 2.

[0038] Each power connection rod of the external power connection unit block 4 is fitted with a fixed power connection frame 6. The fixed power connection frame 6 is connected to the adjacent internal power connection unit block 3. The fixed power connection frame 6 is made of conductive material and can supply power to the external contact end of the internal power connection unit block 3.

[0039] An elastically extendable connecting unit 7 is provided between the connecting rod of the external power unit block 4 and the fixed power connecting frame 6 on the outside, and the connecting unit 7 is connected to the movable frame 5.

[0040] Specifically, the fixed power connection frame 6 includes a circular ring 61 and multiple inner arc-shaped inclined plates 62. The circular ring 61 is connected to the inner power connection unit block 3, and the inner arc-shaped inclined plates 62 are fixed to the circular ring 61. The distance between the inner arc-shaped inclined plates 62 and the axis of the circular ring 61 gradually increases. The power connection rod of the outer power connection unit block 4 is coaxially arranged with the adjacent circular ring 61. The multiple inner arc-shaped inclined plates 62 are evenly distributed in a circumferential array around the axis of the circular ring 61.

[0041] The interconnecting unit 7 includes multiple conductive beads 71 ​​and multiple ball-shaped rods 72. The conductive beads 71 ​​are made of conductive material. The ball-shaped rods 72 are arranged in equal numbers to the conductive beads 71. The ball-shaped rods 72 are installed through the center of the conductive beads 71. The conductive beads 71 ​​are fitted to the inner arc-shaped inclined plate 62 near the axis of the ring 61. Tension-releasing plates 73 are installed at both ends of the ball-shaped rods 72. The ball-shaped rods 72 and tension-releasing plates 73 are made of insulating material. The ball-shaped rods 72 can rotate relative to the tension-releasing plates 73. The end of the tension-releasing plate 73 away from the axis of the adjacent ring 61 is connected to the movable frame 5. The tension-releasing plate 73 has a built-in spring that can pull the connected ball-shaped rods 72 and conductive beads 71 ​​away from the axis of the ring 61.

[0042] In this embodiment, when the drawer box 2 is located inside the power distribution cabinet 1, the connecting rod of the external power unit block 4 is inserted into the inner side of the fixed power frame 6 corresponding to the internal power unit block 3, and the corresponding conductive beads 71 ​​are distributed around the connecting rod of the internal power unit block 3.

[0043] The drawer body 2 is equipped with a pull-out movable frame 5 and a manually driven component 8 located near the drawer body 2.

[0044] In this embodiment, when the drawer box 2 is located inside the power distribution cabinet 1, the manual drive component 8 pulls the movable frame 5 to move towards the drawer box 2, and pulls the corresponding tension extension plate 73 and conductive bead 71 to move towards the drawer box 2. As the distance between the inner arc-shaped inclined plate 62 and the axis of the ring 61 gradually increases, the conductive bead 71 gradually approaches the power receiving rod of the external power unit block 4 as it moves towards the ring 61. When the conductive bead 71 contacts the power receiving rod of the external power unit block 4, the external power unit block 4 is energized with the internal power unit block 3 through the conductive bead 71 and the fixed power receiving frame 6.

[0045] Furthermore, in an alternative embodiment, the manual drive assembly 8 includes two pull drive units 9.

[0046] The tension drive unit 9 includes a tension rope 91, a winding shaft 92, and a side shaft 93. The side shaft 93 is arranged perpendicularly to the winding shaft 92. The drawer body 2 has a cavity for mounting the winding shaft 92 and the side shaft 93. One end of the tension rope 91 is connected to the winding shaft 92, and the other end of the tension rope 91 slides through the inner wall of the drawer body 2 and is connected to the adjacent movable frame 5.

[0047] A double-segment rotating shaft 94 is provided inside the winding shaft 92. The two ends of the double-segment rotating shaft 94 can rotate relative to each other. Both ends of the winding shaft 92 are coaxially mounted with inner rib sleeves 95. Both ends of the double-segment rotating shaft 94 are sleeved with inner rib shafts 96. One of the two inner rib shafts 96 is coaxially slidably inserted into the inner side of the adjacent inner rib sleeve 95. Both inner rib shafts 96 are slidably sleeved with short shafts 97 on their outer sides. The short shafts 97 are rotatably installed inside the drawer body 2. Both short shafts 97 are coaxially mounted with driven bevel gears 98 on their outer surfaces. The side shaft 93 is coaxially mounted with a driving bevel gear 99 on its outer surface. The driving bevel gear 99 meshes with the adjacent driven bevel gear 98.

[0048] In this embodiment, when the movable frame 5 needs to be pulled closer to the drawer box 2, the inner prism shaft 96 on the inner side of the short shaft 97 corresponding to the driven bevel gear 98 meshed with the driving bevel gear 99 engages with the adjacent inner prism sleeve 95. The rotating side shaft 93 meshes with the driven bevel gear 98 through the driving bevel gear 99, driving the short shaft 97, the inner prism shaft 96, the inner prism sleeve 95 and the winding shaft 92 to rotate. The winding shaft 92 rotates and winds the tension rope 91, pulling the movable frame 5 to move towards the drawer box 2, thereby causing the conductive bead 71 to gradually contact the power rod of the external power unit block 4. The external power unit block 4 forms an electrical connection with the internal power unit block 3 through the conductive bead 71 and the fixed power unit 6.

[0049] When the drawer body 2 needs to be pulled out, the side shaft 93 is rotated in the opposite direction, causing the winding shaft 92 to release the tension rope 91. Under the pushing pressure of the elastic telescopic rod, the movable frame 5 tightens the tension rope 91, pushing the movable frame 5 away from the drawer body 2. This causes the conductive bead 71 to gradually detach from the connecting rod of the external electrical unit block 4. When the drawer body 2 moves, this reduces the wear on the connecting rod of the external electrical unit block 4 and increases the service life of the connecting components. At the same time, the ball core rod 72 can rotate relative to the tension telescopic plate 73, converting the friction when the conductive bead 71 contacts the connecting rod of the external electrical unit block 4 into rolling friction, reducing the degree of wear.

[0050] Furthermore, in an optional embodiment, each double-segment rotating shaft 94 is provided with a tensioning bevel gear 910 on the side away from the driving bevel gear 99. The two ends of the double-segment rotating shaft 94 can rotate relative to each other, and the two ends of the double-segment rotating shaft 94 can move synchronously within the winding shaft 92. The tensioning bevel gear 910 meshes with the adjacent driven bevel gear 98. Each tensioning bevel gear 910 is coaxially mounted with a central shaft 911 that can rotate relative to each other. The central shaft 911 rotates through the inner wall of the drawer body 2. The tensioning bevel gear 910 and the central shaft 911 are elastically torsional connected. Preferably, the tensioning bevel gear 910 and the central shaft 911 are connected by a torsion spring.

[0051] Furthermore, in an optional embodiment, a position control plate 941 is provided inside the drawer body 2. The upper and lower ends of the position control plate 941 are rotatably sleeved on the outer surfaces of two double-segment rotating shafts 94. A threaded shaft 942 is threaded through the end face of the position control plate 941. The threaded shaft 942 is rotatably inserted into the inside of the drawer body 2. A long shaft 943 is provided inside the drawer body 2, which is perpendicular to the threaded shaft 942. One end of the long shaft 943 is driven by the threaded shaft 942 through a bevel gear meshing assembly 944. The bevel gear meshing assembly 944 is composed of two meshing bevel gears. The other end of the long shaft 943 rotatably passes through the inner wall of the drawer body 2.

[0052] In this embodiment, the rotating long shaft 943 drives the threaded shaft 942 to rotate through the bevel gear meshing assembly 944. The position control plate 941 meshes with the rotating threaded shaft 942 to drive the double-segment rotating shaft 94 to move within the winding shaft 92. When the drawer box 2 is inserted into the power distribution cabinet 1, the position control plate 941 controls the position of the double-segment rotating shaft 94 so that the inner prism shaft 96 corresponding to the driven bevel gear 98 engaged by the active bevel gear 99 is inserted into the inner prism sleeve 95. The inner prism shaft 96 on the other side is located outside the corresponding inner prism sleeve 95. At this time, the rotating side shaft 93 drives the winding shaft 92 to rotate and wind the tension rope 91, pulling the conductive bead 71 to make hard contact with the power connection rod of the external power unit block 4.

[0053] To achieve elastic force compensation after energization, after the conductive bead 71 makes contact with the energizing rod of the external energizing unit block 4, the prismatic telescopic rod 945 is first pulled to disengage its large-diameter end from the locking prismatic sleeve 946, releasing the lock on the long shaft 943. Then, the long shaft 943 is rotated, driving the threaded shaft 942 to rotate via the bevel gear meshing assembly 944, which in turn drives the position control plate 941 to move axially along the threaded shaft 942. As the position control plate 941 moves, it drives the double-segment rotating shaft 94 to slide axially along the winding shaft 92, causing the inner prismatic shaft 96, which was originally engaged with the driven bevel gear 98 corresponding to the driving bevel gear 99, to gradually disengage from its corresponding inner prismatic sleeve 95. Simultaneously, the inner prismatic shaft 96 on the other side, corresponding to the tensioning bevel gear 910, gradually enters its corresponding inner prismatic sleeve 95. During this switching process, the two inner prismatic shafts 96 never disengage from their corresponding inner prismatic sleeves 95 simultaneously, ensuring that the winding shaft 92 is always constrained and preventing the tension rope 91 from accidentally loosening.

[0054] After the position control plate 941 moves to the set position, push the prismatic telescopic rod 945 again so that its large-diameter end is inserted into the locking prismatic sleeve 946, locking the long shaft 943 and keeping the axial position of the double-segment rotating shaft 94 fixed. At this time, the inner prismatic shaft 96 corresponding to the tension bevel gear 910 has formed a stable transmission engagement with the corresponding inner prismatic sleeve 95.

[0055] Subsequently, the transmission sleeve 913 corresponding to the central shaft 911 is pulled to disengage it from the locking ring 914, releasing the rotational lock on the central shaft 911; then the central shaft 911 is rotated. Since the tension bevel gear 910 and the central shaft 911 are connected by a torsion spring, the rotation of the central shaft 911 drives the tension bevel gear 910 to twist relative to the central shaft 911, thus accumulating elastic torque in the torsion spring. This elastic torque is transmitted through the tension bevel gear 910 to the driven bevel gear 98 meshing with it, and then sequentially through the corresponding short shaft 97, inner shaft 96, and inner sleeve 95 to the winding shaft 92, causing the winding shaft 92 to apply a continuous and stable elastic tension to the movable frame 5 via the tension rope 91. This elastic tension ensures that the conductive bead 71 maintains a constant contact pressure with the power connection rod of the external power connection unit block 4 and the fixed power connection frame 6, effectively preventing loosening of contact due to equipment vibration or minor displacement, further improving the reliability of the power connection.

[0056] Compared to directly installing an elastic energy storage structure between the side shaft 93 and the driving bevel gear 99, in this invention, when the driving bevel gear 99 is directly and fixedly connected to the side shaft 93, the side shaft 93 can stably pull the movable frame 5 to move when it first drives the winding shaft 92 to rotate. After the conductive bead 71 contacts the external electrical unit block 4, the position control plate 941 moves, so that the driven bevel gear 98 meshing with the tension bevel gear 910 corresponds to the inner prism shaft 96 inserted into the inner prism sleeve 95. The rotation center shaft 911 applies a torsional rotational force to the tension bevel gear 910 through elastic torque, generating a stored pulling force on the movable frame 5. This makes it easier to control the elastic pulling force applied to the movable frame 5 after the conductive bead 71 contacts the power rod of the external electrical unit block 4, thus facilitating the control of the magnitude of the elastic pulling force on the movable frame 5.

[0057] A long shaft 943 is located on one end of the drawer body 2 and is coaxially mounted with a rhomboid telescopic rod 945. A locking sleeve 946 is installed on the outside of the drawer body 2. The locking sleeve 946 and the rhomboid telescopic rod 945 are coaxially arranged. The inner side of the locking sleeve 946 is adapted to the large diameter end of the rhomboid telescopic rod 945. When it is necessary to rotate the long shaft 943, the large diameter end of the rhomboid telescopic rod 945 is pulled to disengage from the locking sleeve 946, which can control the rotation of the long shaft 943. When it is not necessary to rotate the long shaft 943, the large diameter end of the rhomboid telescopic rod 945 is controlled to retract into the locking sleeve 946, so that the long shaft 943 cannot rotate, thus fixing the rotation position of the long shaft 943.

[0058] Furthermore, in an optional embodiment, each central shaft 911 and side shaft 93 is coaxially mounted with a rib 912 at one end of the outer side of the drawer body 2. A transmission rib sleeve 913 is slidably sleeved on the outer side of the rib 912, and a locking rib ring 914 is slidably sleeved on the outer side of the transmission rib sleeve 913. The locking rib ring 914 is connected to the outer side of the drawer body 2.

[0059] In this embodiment, when the central shaft 911 and the side shaft 93 need to rotate, the transmission sleeve 913 is pulled to disengage from the locking ring 914, so that the transmission sleeve 913 can drive the rod 912, the central shaft 911 and the side shaft 93 to rotate. When the rotation of the central shaft 911 and the side shaft 93 is not required, the transmission sleeve 913 is controlled to insert into the locking ring 914 to fix the rotation angle of the rod 912 and the transmission sleeve 913.

[0060] A torsion swing plate 915 is installed at the end of the transmission sleeve 913 away from the drawer body 2. Two linkage plates 916 are provided on the outside of the drawer body 2. The two torsion swing plates 915 connected to the two ribs 912 corresponding to the two central shafts 911 on the inside of the drawer body 2 and the two ribs 912 corresponding to the two side shafts 93 are respectively rotatably connected to the two ends of the same linkage plate 916. The two torsion swing plates 915 connected to the linkage plate 916 are arranged in parallel. The ribs 912 connected to the torsion swing plate 915 and the linkage plate 916 are respectively located at the two ends of the torsion swing plate 915.

[0061] In this embodiment, when the linkage plate 916 is moved, it can drive the two connected torsion swing plates 915 to swing, thereby driving the corresponding two central shafts 911 or two side shafts 93 to rotate synchronously.

[0062] The working principle is as follows: When it is necessary to pull out the drawer body 2 to inspect the internal electrical components, first pull the prismatic telescopic rod 945 to allow the long shaft 943 to rotate. Rotating the long shaft 943 drives the threaded shaft 942 to rotate through the bevel gear meshing assembly 944, which in turn drives the position control plate 941 to move and adjust the position of the double-stage rotating shaft 94. This allows the inner prismatic shaft 96 connected to the driven bevel gear 98 corresponding to the tension bevel gear 910 to disengage from the inner prismatic sleeve 95, and the inner prismatic shaft 96 corresponding to the driving bevel gear 99 to re-insert into the inner prismatic sleeve. 95. Then, rotate the side shaft 93 in the opposite direction to allow the winding shaft 92 to rotate in the opposite direction and release the tension rope 91. The movable frame 5 moves away from the drawer body 2 under the push of the elastic telescopic rod in the compressed state, causing the conductive bead 71 to move along the inner arc-shaped inclined plate 62 in a direction away from the axis of the ring 61. The conductive bead 71 disengages from the contact rod of the external electrical unit block 4. At this time, the power is cut off between the external electrical unit block 4 and the internal electrical unit block 3. During the process of pulling out the drawer body 2, there will be no continuous friction of the electrical connection structure, which reduces the wear of the electrical connection parts.

[0063] When it is necessary to push the drawer body 2 into the power distribution cabinet 1 to complete the power connection, first push the drawer body 2 into place, then move the linkage plate 916 corresponding to the side shaft 93 to drive the two side shafts 93 to rotate synchronously. Through the meshing transmission of the active bevel gear 99 and the driven bevel gear 98, the winding shaft 92 is driven to rotate and the tension rope 91 is wound, pulling the movable frame 5 towards the drawer body 2. This causes the conductive bead 71 to move along the inner arc-shaped inclined plate 62 towards the axis of the ring 61, gradually approaching the power connection rod of the external power connection unit block 4, until the conductive bead 71 simultaneously contacts the fixed power connection frame 6 and the power connection rod of the external power connection unit block 4, completing the power connection from the external power connection unit block 4 to the internal power connection unit block 3. The conductive bead 71 can rotate with the ball rod 72, converting contact friction into rolling friction, further reducing wear. After the conductive bead 71 contacts the power rod of the external power unit block 4, the position control plate 941 switches the transmission, so that the inner prism shaft 96 connected to the driven bead gear 98 meshing with the tension bead gear 910 is inserted into the corresponding inner prism sleeve 95. The linkage plate 916 corresponding to the two central shafts 911 is rotated, and the torsion spring applies torque to the central shaft 911, thereby applying a stable elastic tension to the movable frame 5, ensuring that the conductive bead 71 is in close contact with the power rod of the external power unit block 4 and the fixed power connection frame 6, improving the stability of the power connection and avoiding the problem of loose contact and power failure. Finally, the prism telescopic rod 945 is inserted into the locking prism sleeve 946 and the transmission prism sleeve 913 is inserted into the locking prism ring 914 to complete the locking of the positions of each component, and it can be put into normal use.

[0064] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A protective power distribution device for power grids, comprising a distribution cabinet (1) and drawer boxes (2), wherein multiple drawer boxes (2) are provided, and multiple drawer boxes (2) are slidably installed inside the distribution cabinet (1), characterized in that, Also includes: An internal power supply unit block (3) is provided in the same number as the drawer box (2). Multiple internal power supply unit blocks (3) are installed one-to-one through the inside of multiple drawer boxes (2). Each internal power supply unit block (3) is provided with an external power supply unit block (4) at one end of the drawer box (2). The external power supply unit block (4) is installed inside the power distribution cabinet (1). The external power supply unit block (4) has multiple power supply rod-shaped structures at one end near the internal power supply unit block (3). A movable frame (5) is provided between the external power unit block (4) and the internal power unit block (3). The movable frame (5) is elastically connected to the adjacent drawer box (2). Each power rod of the external power unit block (4) is sleeved with a fixed power frame (6). The fixed power frame (6) is connected to the adjacent internal power unit block (3). The external power unit block (4) has a power connection unit (7) that can be elastically extended between the power connection rod and the fixed power connection frame (6) on the outside. The power connection unit (7) is connected to the movable frame (5). The drawer body (2) is equipped with a manually driven assembly (8) that pulls the movable frame (5) close to the drawer body (2).

2. The protective distribution device for power grids according to claim 1, characterized in that: The fixed power connection frame (6) includes a ring (61) and multiple inner arc-shaped inclined plates (62). The ring (61) is connected to the inner power connection unit block (3). The inner arc-shaped inclined plates (62) are fixed to the ring (61). The distance between the inner arc-shaped inclined plates (62) and the axis of the ring (61) gradually increases as the inner arc-shaped inclined plates (62) move away from the ring (61). The power connection rod of the outer power connection unit block (4) is coaxially arranged with the adjacent ring (61). The multiple inner arc-shaped inclined plates (62) are evenly distributed in a circumferential array around the axis of the ring (61).

3. A protective distribution device for power grids according to claim 2, characterized in that: The electrical unit (7) includes multiple conductive beads (71) and multiple ball-shaped rods (72). The number of ball-shaped rods (72) is equal to that of conductive beads (71). The ball-shaped rods (72) are installed through the center of the conductive beads (71). The conductive beads (71) are fitted to the inner arc-shaped inclined plate (62) near the axis of the ring (61). Tension-expanding plates (73) are installed at both ends of the ball-shaped rods (72). The ball-shaped rods (72) can rotate relative to the tension-expanding plates (73). The end of the tension-expanding plate (73) away from the axis of the adjacent ring (61) is connected to the movable frame (5).

4. A protective power distribution device for power grids according to claim 3, characterized in that: The manual drive assembly (8) includes two tension drive units (9); The tension drive unit (9) includes a tension rope (91), a winding shaft (92) and a side shaft (93). The side shaft (93) is perpendicular to the winding shaft (92). The drawer body (2) has a cavity for the winding shaft (92) and the side shaft (93) to be installed. One end of the tension rope (91) is connected to the winding shaft (92), and the other end of the tension rope (91) slides through the inner wall of the drawer body (2) and is connected to the adjacent movable frame (5). The inner side of the winding shaft (92) is provided with a double-segment rotating shaft (94). The two ends of the double-segment rotating shaft (94) can rotate relative to each other. Both ends of the winding shaft (92) are coaxially installed with inner rib sleeves (95). Both ends of the double-segment rotating shaft (94) are sleeved with inner rib shafts (96). One of the two inner rib shafts (96) is coaxially slidably inserted into the inner side of the adjacent inner rib sleeve (95). Both outer sides of the two inner rib shafts (96) are slidably sleeved with short shafts (97). The short shafts (97) are rotatably installed inside the drawer body (2). Both outer surfaces of the two short shafts (97) are coaxially installed with driven bevel gears (98). The outer surface of the side shaft (93) is coaxially installed with a driving bevel gear (99). The driving bevel gear (99) meshes with the adjacent driven bevel gear (98).

5. A protective distribution device for power grids according to claim 4, characterized in that: Each double-segment rotating shaft (94) has a tensioning bevel gear (910) on the side away from the driving bevel gear (99). The tensioning bevel gear (910) meshes with the adjacent driven bevel gear (98). Each tensioning bevel gear (910) is coaxially mounted with a central shaft (911) that can rotate relative to it. The central shaft (911) rotates through the inner wall of the drawer body (2). The tensioning bevel gear (910) and the central shaft (911) are elastically torsional connected.

6. A protective distribution device for power grids according to claim 5, characterized in that: Each central shaft (911) and side shaft (93) is coaxially mounted with a rib (912) at one end of the drawer body (2). A transmission rib sleeve (913) is slidably sleeved on the outside of the rib (912). A locking rib ring (914) is slidably sleeved on the outside of the transmission rib sleeve (913). The locking rib ring (914) is connected to the outside of the drawer body (2).

7. A protective distribution device for power grids according to claim 6, characterized in that: The transmission sleeve (913) is equipped with a torsion swing plate (915) at the end away from the drawer body (2). Two linkage plates (916) are provided on the outside of the drawer body (2). The two torsion swing plates (915) connected to the two ribs (912) corresponding to the two central shafts (911) on the inside of the drawer body (2) and the two ribs (912) corresponding to the two side shafts (93) are respectively rotatably connected to the two ends of the same linkage plate (916).

8. A protective distribution device for power grids according to claim 7, characterized in that: The drawer body (2) is provided with a position control plate (941) on the inner side. The upper and lower ends of the position control plate (941) are rotatably sleeved on the outer surface of two double-segment rotating shafts (94). The end face of the position control plate (941) is threaded through a threaded shaft (942). The threaded shaft (942) is rotatably inserted into the inner side of the drawer body (2). The inner side of the drawer body (2) is provided with a long shaft (943) that is perpendicular to the threaded shaft (942). One end of the long shaft (943) is driven by the threaded shaft (942) through a bevel gear meshing assembly (944). The other end of the long shaft (943) rotatably passes through the inner wall of the drawer body (2).

9. A protective distribution device for power grids according to claim 8, characterized in that: The long shaft (943) is located on one end of the drawer body (2) and a prismatic telescopic rod (945) is coaxially installed. A locking prismatic sleeve (946) is installed on the outside of the drawer body (2). The locking prismatic sleeve (946) and the prismatic telescopic rod (945) are coaxially arranged, and the inner side of the locking prismatic sleeve (946) is adapted to the large diameter end of the prismatic telescopic rod (945).

10. A protective distribution device for power grids according to claim 9, characterized in that: The two twisting swing plates (915) connected by the linkage plate (916) are arranged in parallel, and the prism rod (912) connected to the twisting swing plate (915) and the linkage plate (916) are located at the two ends of the twisting swing plate (915).

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