Arrangement system for dam cable of water conservancy and hydropower engineering

Abstract

The invention discloses an arrangement system, particularly discloses an arrangement system for dam cables of water conservancy and hydropower engineering, and belongs to the technical field of design and construction of water conservancy and hydropower engineering structures. The arrangement system for the dam cables of the water conservancy and hydropower engineering is convenient to arrange, overhaul and construct, and interference between the arranged cables is obviously reduced. The arrangement system comprises a groove structure, a cable supporting arrangement structure and a lifting adjusting device, the open top of the groove structure is closed through a steel cover plate, and the cable supporting arrangement structure is arranged on the side wall of the groove structure in a reciprocating motion mode in the vertical direction through the lifting adjusting device under the cooperation of the groove structure.

Description

Technical Field

[0001] The invention relates to a layout system, in particular to a layout system for cables of a dam of a water conservancy and hydropower project, and belongs to the technical field of design and construction of water conservancy and hydropower project structures. Background Art

[0002] The cable trench is a pipeline space for laying cable facilities, and is also a enclosure and protection structure for the laid cable facilities. There are many types, such as rectangular, circular, and arched. The cable laying of the dam must pass through the dam top, the slope behind the dam, the traffic road behind the dam, and other areas. Since the space for cable laying is usually small and there are restrictions on the working surface, the daily maintenance or inspection of the cable is relatively difficult. This is mainly reflected in the following aspects: the conventional single cable trench cover is heavy and difficult for one person to operate, especially when the mechanical auxiliary means are difficult to reach the dam surface area, it is particularly difficult to open the cover; the cables are arranged in a complex manner in the cable trench, and the cable trench space is usually small, which limits the working space of maintenance and repair personnel; in addition, when there are multiple layers of cables, the parallel upper cables will interfere with the maintenance and inspection of the lower cables. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a cable arrangement system for dams of water conservancy and hydropower projects, which is convenient for arrangement, maintenance and construction and significantly reduces interference between arranged cables.

[0004] The technical solution adopted to solve the above technical problems is: a cable arrangement system for water conservancy and hydropower engineering dams, the arrangement system comprising a groove structure, a cable support arrangement structure and a lifting and adjusting device, the open top of the groove structure is closed by a steel cover plate, and the cable support arrangement structure is arranged on the side wall of the groove structure in a vertically reciprocating manner with the cooperation of the groove structure through the lifting and adjusting device.

[0005] Furthermore, the steel cover plate includes a steel cover plate body and an opening and closing spring. The steel cover plate body hinged on a side edge of the open top of the groove structure is kept in an open or closed state by the opening and closing spring.

[0006] A preferred embodiment of the above scheme is that the groove structure is a concrete enclosure whose projection in its cross section is rectangular, a pedestrian passage extending along the length direction is provided on one side of the bottom of the concrete enclosure, a drainage ditch extending along the length direction is provided on the other side of the bottom of the concrete enclosure, an arrangement mechanism is provided on the side wall of the concrete enclosure on the side where the drainage ditch is provided, and the cable support arrangement structure is arranged on the side wall of the concrete enclosure on the side where the drainage ditch is provided so as to be vertically reciprocatingly movable through a lifting and adjusting device with the cooperation of the arrangement mechanism.

[0007] Furthermore, the arrangement mechanism includes a forward slide groove, a lateral slide groove and a transverse fixed groove. The vertically extending forward slide grooves are arranged at intervals on the side wall of the concrete enclosure on the side where the drainage ditch is provided. A vertically extending lateral slide groove is provided on at least one side wall of each forward slide groove. At least two horizontally extending transverse fixed grooves are arranged at intervals on each positive slide groove along the height direction. The cable support arrangement structure is reciprocatingly movable along the forward slide groove with the cooperation of the lateral slide groove through the lifting and adjusting device and is arranged on the side wall of the concrete enclosure on the side where the drainage ditch is provided. The cable support arrangement structure moved into place is locked at a corresponding height position with the cooperation of the transverse fixed groove and the lifting and adjusting device.

[0008] A preferred embodiment of the above scheme is that the cable support arrangement structure comprises at least two groups of cable racks extending in the horizontal direction, and each group of cable racks is sequentially arranged in the height direction on the side wall of the concrete enclosure on the side where the drainage ditch is provided through a lifting and adjusting device; during the cable arrangement and cable maintenance process, the horizontal height of each group of cable racks is moved into place through the lifting and adjusting device with the cooperation of the arrangement mechanism.

[0009] Furthermore, the cable support arrangement structure includes at least four support members, and along the length direction, at least two support members that can move up and down with the cable rack are sequentially arranged between the outer edge of each group of cable racks and the side wall at the corresponding position.

[0010] A preferred embodiment of the above scheme is that the lifting and adjusting device includes multiple sets of lifting and climbing mechanisms whose number is equal to the number of cable racks, and each group of cable racks can be lifted and lowered vertically through a set of lifting and climbing mechanisms in cooperation with the arranging mechanism and are arranged on the side wall of the concrete enclosure on one side of which the drainage ditch is provided.

[0011] Furthermore, each set of lifting and crawling mechanisms respectively includes a crawling drive component, a crawling component, a support limit component and a two-way locking component. The two-way locking component is movably arranged on the crawling component. The crawling component is arranged on the cable rack in accordance with the corresponding positive slide groove position through the support limit component. The cable rack drives the crawling component to move up and down along the positive slide groove under the cooperation of the support limit component and the lateral slide groove through the driving force output by the crawling drive component. The cable rack moved into position is locked or unlocked by the two-way locking component with the cooperation of the transverse fixed groove.

[0012] A preferred embodiment of the above scheme is that a fixed groove section positive restraint component is also provided at the intersection of the forward sliding groove and the transverse fixed groove. During operation, the cable rack is locked at the corresponding transverse fixed groove height position through the fixed groove section positive restraint component with the cooperation of the two-way locking assembly.

[0013] Furthermore, the crawling drive assembly is an energy storage battery, the crawling assembly includes a plurality of groups of sliding rollers whose number is equal to the number of positive slide grooves, the support limit assembly includes a plurality of support limit rods whose number is twice the number of sliding rollers, the two-way locking assembly includes a plurality of rotatable figure-eight fasteners whose number is equal to the number of sliding rollers, and a rotatable figure-eight fastener is movably arranged on each group of sliding rollers, and a group of sliding rollers is movably arranged at positions corresponding to the corresponding positive slide groove positions on the cable rack through two support limit rods, and each group of sliding rollers is driven by an energy storage battery, and each group of sliding rollers that runs to the intersection of the positive slide groove and the transverse fixed groove is locked by the positive restraining components of the fixed groove sections at the corresponding positions.

[0014] The beneficial effects of the present invention are as follows: the technical solution provided by the present application is to set up a layout system including a groove structure, a cable support layout structure and a lifting and adjusting device, and then close the open top of the groove structure through a steel cover plate, and arrange the cable support layout structure on the side wall of the groove structure in a vertically reciprocating manner under the cooperation of the groove structure through the lifting and adjusting device. In this way, when it is necessary to arrange the cable in the groove structure, it is only necessary to first raise the cable support layout structure to a position suitable for the operator to stand or squat under the cooperation of the groove structure through the lifting and adjusting device, which is convenient for the operator to arrange and the maintenance construction operation is convenient. At the same time, since the cable of the present application is arranged on the side wall of the groove structure through the cable support layout structure, the arrangement method of various cables directly stacked on the bottom plate of the groove structure in the prior art is changed, so that the mutual interference between the arranged cables can be significantly reduced, which is convenient for the convenience of the arrangement construction operation, and at the same time, it is more convenient to distinguish and clean in the subsequent maintenance and maintenance, so as to achieve the purpose of significantly improving the efficiency of the arrangement and subsequent maintenance and maintenance construction operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the cable arrangement system for a dam of a water conservancy and hydropower project according to the present invention;

[0016] Figure 2 It is a transverse cross-sectional view of the cable arrangement system for a dam of a water conservancy and hydropower project according to the present invention;

[0017] Figure 3 It is a schematic diagram of the three-dimensional arrangement structure of the arrangement mechanism involved in the arrangement system of the cable of the dam of the water conservancy and hydropower project of the present invention on the side wall of the groove structure;

[0018] Figure 4 It is a three-dimensional structural schematic diagram of the lifting and lowering adjustment device and the cable rack involved in the cable arrangement system for the dam of the water conservancy and hydropower project of the present invention;

[0019] Figure 5The present invention is a schematic diagram of the arrangement structure of opening and closing springs and hinge points involved in the arrangement system of cables for dams of water conservancy and hydropower projects.

[0020] Marked in the figure are: groove structure 1, steel cover body 2, opening and closing spring 3, pedestrian passage 4, drainage ditch 5, forward slide 6, lateral slide 7, transverse fixed groove 8, cable rack 9, support 10, creeping drive assembly 11, fixed groove section positive restraining member 12, sliding roller 13, support limit rod 14, rotatable figure eight fastener 15. DETAILED DESCRIPTION

[0021] like Figure 1 to Figure 5 The present invention provides a layout system for cables of dams of water conservancy and hydropower projects, which is convenient for layout and maintenance, and significantly reduces interference between the laid cables. The layout system includes a groove structure 1, a cable support layout structure and a lifting and adjusting device. The open top of the groove structure 1 is closed by a steel cover plate, and the cable support layout structure is arranged on the side wall of the groove structure 1 in a vertically reciprocating manner with the cooperation of the groove structure 1 through the lifting and adjusting device. The technical solution provided by the present application is provided by setting up a layout system including a groove structure, a cable support layout structure and a lifting and adjusting device, and then the open top of the groove structure is closed by a steel cover plate, and the cable support layout structure is arranged on the side wall of the groove structure in a vertically reciprocating manner with the cooperation of the groove structure through the lifting and adjusting device. In this way, when it is necessary to arrange the cables in the groove structure, it is only necessary to first raise the cable support arrangement structure to a position suitable for the operator to stand or squat and operate through the lifting and adjusting device with the cooperation of the groove structure. This is convenient for the operator to arrange the cables and for the maintenance and construction operations. At the same time, since the cables of the present application are arranged on the side walls of the groove structure through the cable support arrangement structure, the arrangement method of directly stacking various cables on the bottom plate of the groove structure in the prior art is changed, thereby significantly reducing the mutual interference between the arranged cables, which is convenient for the arrangement and construction operations and more convenient for the identification and cleaning in the subsequent repair and maintenance, thereby achieving the purpose of significantly improving the efficiency of the arrangement and subsequent repair and maintenance construction operations.

[0022] Combined with the characteristics of the existing technology that the steel cover plates all have a certain weight, in order to reduce the labor intensity of the operators as much as possible and improve operability, the steel cover plate of the present application includes a steel cover plate body 2 and an opening and closing spring 3. The steel cover plate body 2 hinged on a side of the open top of the groove structure 1 is kept in an open or closed state by the opening and closing spring 3. At this time, the groove structure 1 is preferably a concrete enclosure whose projection in its cross section is rectangular, and a pedestrian passage 4 extending in the length direction is provided on one side of the bottom of the concrete enclosure, and a drainage ditch 5 extending in the length direction is provided on the other side of the bottom of the concrete enclosure. An arrangement mechanism is provided on the side wall of the concrete enclosure on the side where the drainage ditch 5 is provided, and the cable support arrangement structure is arranged on the side wall of the concrete enclosure on the side where the drainage ditch 5 is provided through a lifting and adjusting device and can be reciprocated vertically with the cooperation of the arrangement mechanism. The cable support arrangement structure includes at least two groups of cable racks 9 extending in the horizontal direction. Each group of cable racks 9 is arranged sequentially in the height direction on the side wall of the concrete enclosure on the side where the drainage ditch 5 is provided through a lifting and adjusting device; during the cable arrangement and cable maintenance process, the horizontal height of each group of cable racks 9 is moved into place through the lifting and adjusting device with the cooperation of the arrangement mechanism. More specifically, the arrangement mechanism includes a forward slide 6, a lateral slide 7 and a transverse fixed groove 8. The forward slides 6 extending vertically are arranged at intervals on the side wall of the concrete enclosure on the side where the drainage ditch 5 is provided. A lateral slide 7 extending vertically is provided on at least one side wall of each forward slide 6. At least two transverse fixed grooves 8 extending horizontally are arranged at intervals on each forward slide 6 in the height direction. The cable support arrangement structure is arranged on the side wall of the concrete enclosure on the side where the drainage ditch 5 is provided by the cooperation of the lateral slide 7 through the lifting and adjusting device. The cable support arrangement structure moved into place is locked in the corresponding height position by the cooperation of the transverse fixed groove 8 and the lifting and adjusting device. The cable support arrangement structure includes at least four support members 10. In the length direction, at least two support members 10 that can move up and down with the cable rack 9 are arranged in sequence between the outer edge of each group of cable racks 9 and the side wall at the corresponding position.

[0023] Accordingly, in order to adapt to the above-mentioned groove structure 1, so as to facilitate the lifting and lowering operation of the cable rack, and to simplify the structure of the lifting and adjusting device of the present application as much as possible, and to reduce the production cost, the lifting and adjusting device described in the present application includes a plurality of lifting and climbing mechanisms of the same number as the number of cable racks, and each group of cable racks 9 can be lifted and lowered vertically by a set of lifting and climbing mechanisms in cooperation with the arrangement mechanism and arranged on the side wall of the concrete enclosure on the side where the drainage ditch 5 is provided. At this time, each group of lifting and climbing mechanisms includes a climbing drive component 11, a crawling component, a support and limit component and a two-way locking component, and the two-way locking component is movably arranged on the crawling component, and the crawling component is arranged on the cable rack 9 in accordance with the position of the corresponding forward slide 6 through the support and limit component, and the cable rack 9 drives the crawling component to move up and down along the forward slide 7 through the driving force output by the crawling drive component 11, and the cable rack 9 moved in place is locked or unlocked by the two-way locking component in cooperation with the transverse fixed groove 8. Furthermore, in order to enhance the stability of the support, the present application also provides a fixed groove section positive restraint member 12 at the intersection of the forward sliding groove 6 and the transverse fixed groove 8. During operation, the cable rack 9 is locked at the corresponding transverse fixed groove 8 height position through the fixed groove section positive restraint member 12 with the cooperation of the two-way locking assembly. The more specific structure of each component of the lifting and crawling mechanism is that the crawling drive component 11 is an energy storage battery, the crawling component includes a plurality of groups of sliding rollers 13 whose number is equal to the number of positive slide grooves, the support and limit component includes a plurality of support and limit rods 14 whose number is twice the number of sliding rollers 13, and the two-way locking component includes a plurality of rotatable figure-eight fasteners 15 whose number is equal to the number of sliding rollers 13, and each group of sliding rollers 13 is movably arranged with a rotatable figure-eight fastener 15, and a group of sliding rollers 13 is movably arranged at the position corresponding to the corresponding positive slide groove 6 on the cable rack 9 through two support and limit rods 14, and each group of sliding rollers 13 is driven by the energy storage battery, and each group of sliding rollers 13 that runs to the intersection of the positive slide groove 6 and the transverse fixed groove 8 is locked by the fixed groove section positive constraint member 12 at the corresponding position.

[0024] The technical solution of the present application is further described below through specific embodiments:

[0025] Embodiment 1

[0026] The present application relates to the technical field of water conservancy and hydropower design and construction, and specifically to a type of cable trench structure for a dam that can be automatically raised and lowered, including a spring-controlled steel cover; a rectangular concrete enclosure structure including special sliding and fixed tracks, namely the above-mentioned concrete enclosure; and a cable rack system with a driving pulley component. The present application controls the opening and closing of the cable trench cover by setting a special spring structure, thereby reducing the work intensity and difficulty of the staff to open and close the cover; the lifting and lowering of the cable rack is controlled by components that can be used for the lifting of the cable rack (including sliding tracks, fixed buckles, and braking equipment), which provides favorable conditions for installation and maintenance, avoids workers lying on the ground or drilling into narrow passages to install and repair cables in the cable trench, reduces the probability of workers being injured, and reduces the difficulty of cable installation and maintenance. The cable is set on the cable rack, which reduces the probability of the cable being soaked by accumulated water, thereby reducing the aging speed of the insulator, extending the service life of the cable while reducing the probability of cable leakage, and increasing the guarantee of safe operation. In addition, when there are multiple layers of cables arranged, hierarchical control can also reduce the interference of the upper cables arranged in parallel on the maintenance and maintenance of the lower cables.

[0027] In order to facilitate the maintenance and repair of cables, the present application provides a dam cable trench structure that can be used for automatic lifting of cables. The technical solution adopted by the present application to solve the above problems is:

[0028] The cable trench structure of the dam includes a spring-controlled steel cover; a rectangular concrete enclosure structure with special sliding and fixed tracks; a drainage ditch and a maintenance walkway; and a cable rack system with a drive pulley component.

[0029] The cover is connected to the side wall of the cable trench through a "6"-shaped spring shaft. The number of springs is determined by the deadweight of the cover. It is necessary to ensure that the spring structure provides sufficient rebound force and the rebound force when the cover is closed is slightly less than the deadweight of the cover. When closing the cover, the spring is compressed so that the cover automatically closes under certain support conditions; when opening the cover, the spring rebounds and provides rebound force to enable maintenance personnel to easily open the cover.

[0030] The rectangular concrete maintenance structure plays a supporting and protective role. One side of the bottom plate is used as a passage for maintenance and repair personnel, and the width of the passage should not be less than 0.45m. On the other side, a special slide is set through the inner side of the cable trench, and the slide is used for the cable rack to move up and down and fix. The slide includes a forward slide and a lateral slide. According to the actual needs of maintenance and repair, a fixed groove in the slide can be set at 20cm to 50cm. The length of the fixed groove is selected based on the weight of the lifting object, the setting of the fasteners, etc. If the lifting height is to be increased, a special slide is also set on the inner side of the cable trench cover. After the cable trench is opened and fixed, it can continue to be lifted and fixed along the special slide.

[0031] The cable rack can be arranged in a single layer or multiple layers in the cable well according to the needs. Generally, a switch-controlled belt-driven roller component system is arranged every 2m to 5m to connect with the inner wall of the cable trench.

[0032] The switch-controlled belt-driven roller connection system includes a power supply system, a sliding system, a support rod and an eight-shaped fastener. When the cable rack rises, under the braking action of the power supply, the sliding system rises under the constraints of the forward and lateral tracks. When it rises to the fixed groove position, the buckle will spring open and play a supporting role when the lateral constraint is lost; when the cable rack descends, the direction of the fastener is adjusted to an inverted eight-shaped shape, and it reaches the predetermined position under the lateral constraint and braking action.

[0033] In the present application, the positive constraint member of the fixed groove section is a small rectangular groove. When the pulley system slides to the fixed groove, the pulley and the support slide into the groove to provide positive constraint for the cable rack. The rotatable "figure eight" fastener also slides into the fixed groove more easily to provide lateral constraint for the cable rack. The rolling wheel is attached to the support, the rolling wheel and the support are in the slide groove, the rotatable "figure eight" fastener is connected to the rolling wheel and the support, and the power supply system is connected to the rolling wheel through a line. When the cable rack needs to slide up and down, turn on the power switch of the power supply system to slide up or down. When the rolling wheel slides to the fixed groove, the rolling wheel and the support slide into the groove, the rotatable "figure eight" fastener slides into the fixed groove, and the power supply system switch automatically stops.

Claims

1. A cable arrangement system for dams of water conservancy and hydropower projects, characterized by: The arrangement system comprises a groove structure (1), a cable support arrangement structure and a lifting and adjusting device. The open top of the groove structure (1) is closed by a steel cover plate, and the cable support arrangement structure is arranged on the side wall of the groove structure (1) in a vertically reciprocating manner with the cooperation of the groove structure (1) through the lifting and adjusting device.

2. The cable arrangement system for a dam of a water conservancy and hydropower project according to claim 1 is characterized in that: The steel cover plate comprises a steel cover plate body (2) and an opening and closing spring (3). The steel cover plate body (2) is hinged on a side edge of the open top of the groove structure (1) and is kept in an open or closed state by the opening and closing spring (3).

3. The cable arrangement system for a dam of a water conservancy and hydropower project according to claim 2 is characterized in that: The groove structure (1) is a concrete enclosure whose projection in its cross section is rectangular. A pedestrian passage (4) extending in the length direction is arranged on one side of the bottom of the concrete enclosure, and a drainage ditch (5) extending in the length direction is arranged on the other side of the bottom of the concrete enclosure. An arrangement mechanism is arranged on the side wall of the concrete enclosure on the side where the drainage ditch (5) is arranged. The cable support arrangement structure is arranged on the side wall of the concrete enclosure on the side where the drainage ditch (5) is arranged so as to be reciprocally movable in the vertical direction through a lifting and adjusting device in cooperation with the arrangement mechanism.

4. The cable arrangement system for a dam of a water conservancy and hydropower project according to claim 3 is characterized in that: The arrangement mechanism comprises a forward slide groove (6), a lateral slide groove (7) and a transverse fixed groove (8); the forward slide grooves (6) extending vertically are arranged at intervals on the side wall of the concrete enclosure on the side where the drainage ditch (5) is provided; at least one side wall of each forward slide groove (6) is provided with a lateral slide groove (7) extending vertically; at least two transverse fixed grooves (8) extending horizontally are arranged at intervals on each forward slide groove (6) in the height direction; the cable support arrangement structure is arranged on the side wall of the concrete enclosure on the side where the drainage ditch (5) is provided so as to be reciprocatingly movable along the forward slide groove (6) in cooperation with the lateral slide groove (7) through a lifting and adjusting device; the cable support arrangement structure moved into position is locked at a corresponding height position in cooperation with the transverse fixed groove (8) and the lifting and adjusting device.

5. The cable arrangement system for a dam of a water conservancy and hydropower project according to claim 1, 2, 3 or 4, characterized in that: The cable support and arrangement structure comprises at least two groups of cable racks (9) extending in the horizontal direction, and each group of cable racks (9) is arranged in sequence in the height direction on the side wall of the concrete enclosure structure on the side where the drainage ditch (5) is provided through a lifting and adjusting device; during the cable arrangement and cable maintenance process, the horizontal height of each group of cable racks (9) is moved into place through the lifting and adjusting device in cooperation with the arrangement mechanism.

6. The cable arrangement system for a dam of a water conservancy and hydropower project according to claim 5 is characterized in that: The cable support arrangement structure comprises at least four support members (10), and at least two support members (10) are sequentially arranged between the outer edge of each group of cable racks (9) and the side wall at the corresponding position along the length direction and can move up and down with the cable racks (9).

7. The cable arrangement system for a dam of a water conservancy and hydropower project according to claim 6 is characterized in that: The lifting and adjusting device comprises a plurality of lifting and climbing mechanisms, the number of which is equal to the number of cable racks. Each group of cable racks (9) can be lifted and lowered vertically by a lifting and climbing mechanism in cooperation with the arrangement mechanism and is arranged on the side wall of the concrete enclosure on one side of which the drainage ditch (5) is arranged.

8. The cable arrangement system for a dam of a water conservancy and hydropower project according to claim 7 is characterized in that: Each lifting and crawling mechanism comprises a crawling drive assembly (11), a crawling assembly, a support and limit assembly and a two-way locking assembly. The two-way locking assembly is movably arranged on the crawling assembly. The crawling assembly is arranged on the cable rack (9) in a manner adapted to the position of the corresponding forward slide groove (6) through the support and limit assembly. The cable rack (9) is driven by the driving force output by the crawling drive assembly (11) to move up and down along the forward slide groove in cooperation with the support and limit assembly and the lateral slide groove (7). The cable rack (9) moved into position is locked or unlocked by the two-way locking assembly in cooperation with the transverse fixing groove (8).

9. The cable arrangement system for a dam of a water conservancy and hydropower project according to claim 8, characterized in that: A fixed groove section positive restraining member (12) is also provided at the intersection of the positive sliding groove (6) and the transverse fixed groove (8). During operation, the cable rack (9) is locked at a corresponding transverse fixed groove (8) height position by the fixed groove section positive restraining member (12) in cooperation with a bidirectional locking assembly.

10. The cable arrangement system for a dam of a water conservancy and hydropower project according to claim 9, characterized in that: The crawling drive assembly (11) is an energy storage battery. The crawling assembly includes a plurality of groups of sliding rollers (13) whose number is equal to the number of the forward sliding grooves. The support and limit assembly includes a plurality of support and limit rods (14) whose number is twice the number of the sliding rollers (13). The two-way locking assembly includes a plurality of rotatable eight-shaped fasteners (15) whose number is equal to the number of the sliding rollers (13). A rotatable eight-shaped fastener (15) is movably arranged on each group of sliding rollers (13). A group of sliding rollers (13) is movably arranged at a position corresponding to the position of the corresponding forward sliding groove (6) on the cable rack (9) through two support and limit rods (14). Each group of sliding rollers (13) is driven by the energy storage battery. Each group of sliding rollers (13) that runs to the intersection of the forward sliding groove (6) and the transverse fixed groove (8) is locked by the fixed groove section positive restraining member (12) at the corresponding position.

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