Mountain photovoltaic field cable laying device and laying method

Abstract

The invention discloses a mountain photovoltaic field cable laying device and method. The mountain photovoltaic field cable laying device comprises a door frame, a cable unfolding and coil discharging fixing support, a Y-shaped supporting frame and a cable unfolding and coil discharging rotating support. Wherein a cable guide ring is arranged on the cable unfolding and coiling fixing bracket; the portal frame, the cable unfolding and coiling fixing bracket and the Y-shaped supporting frame are combined for use and are used for laying construction of a direct-current cable in a photovoltaic field area; the cable unfolding and coiling rotary support is used in combination with a transport vehicle and is used for laying construction of an alternating-current cable in a line section from a box transformer substation to a 35kV current collection box. The Y-shaped supporting frame, the cable wire-unfolding and coil-out rotating support and the transport vehicle are used in a combined mode and used for laying construction of the alternating-current cable on the overhead iron tower section from the box transformer substation to the current collection line. According to the method, the cable can be automatically unfolded at the cable reel, the manual control cost is reduced, the construction efficiency is greatly improved compared with that of a traditional method, and the method not only ensures the operation safety under the complex mountain construction environment, but also improves the construction quality, improves the construction efficiency and reduces the construction cost.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy photovoltaic construction, and in particular to a cable laying device and a laying method for a mountain photovoltaic field. Background Art

[0002] At present, the laying of photovoltaic DC cables in array areas under complex mountainous environments mostly adopts the manual line laying method. During the cable laying process, the weeds, shrubs and stones on the laying path are cleared and the laying process begins directly. This method requires manual laying of the cable on the cable reel, and the hard debris on the laying path cannot be completely cleaned during the actual on-site construction, which can easily cause cable damage, seriously affecting the normal operation of the photovoltaic strings in the next 25 years.

[0003] When laying AC cables, the construction site usually uses a cable drum and a crane to suspend the cable. The cable drum is rotated manually, and the cable end is arranged by workers, tractors or excavators to drag the cable to the laying site. Since the AC cable is thicker in diameter and heavier in weight, it is very easy to be thrown out and injure people if it is not carefully observed when the cable is unrolled. At the same time, when using this method, the cable drum is large in size and heavy in weight, which is not convenient to move. At the same time, the direct contact of the cable with the ground can easily cause the cable to be damaged.

[0004] To improve the above problems, the main solutions and shortcomings at this stage are as follows:

[0005] 1. The DC cable uses a cable drum. As one end of the cable exerts force, the cable will drive the cable drum to rotate, which plays the role of automatically unrolling the cable out of the drum. However, due to the small diameter of the AC cable drum, the height of the outlet is low from the ground, which easily causes friction between the cable and the ground. At the same time, one cable drum bracket can only meet the laying work of one cable drum, the work efficiency is low and the construction quality cannot be guaranteed.

[0006] 2. There is no better solution for AC cable at the time of cable unwinding. However, linear rollers and angle rollers are often used on the cable laying path to keep the cable from contacting the ground. However, the height of such rollers is relatively low, and the cable is prone to fall down and contact the ground between the rollers due to its own weight, causing the cable to break. At the same time, the width of the roller is limited, and during the laying process, the cable may derail from the roller and fall to the ground, causing damage to the cable. Summary of the invention

[0007] Due to the above-mentioned defects in the prior art, the present invention provides a cable laying device and a laying method for mountain photovoltaic fields to solve the problem that the cables are easily damaged during the prior photovoltaic cable laying.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] The cable laying device in mountain photovoltaic field includes a gantry, a cable unrolling and reeling fixed bracket, a "Y"-shaped support frame, and a cable unrolling and reeling rotating bracket; wherein, a cable guide ring is arranged on the cable unrolling and reeling fixed bracket; the gantry, the cable unrolling and reeling fixed bracket, and the "Y"-shaped support frame are used in combination for the laying of DC cables in photovoltaic fields; the cable unrolling and reeling rotating bracket and the transport vehicle are used in combination for the laying of AC cables from the box-type transformer to the 35kV collector box line section; the "Y"-shaped support frame, the cable unrolling and reeling rotating bracket and the transport vehicle are used in combination for the laying of AC cables from the box-type transformer to the collector line overhead tower section.

[0010] The gantry is formed by welding rigid tubular material tubes, the height of the gantry is higher than the overall height of the cable reel deployment fixing bracket, and the width of the gantry is wider than the diameter of the cable reel to be deployed plus the cable reel spacing multiplied by the number of reels.

[0011] The cable unrolling reel fixing bracket includes a long steel plate with a length greater than the diameter of the cable reel surface. The center of the steel plate is movably connected to the longitudinal steel pipe, and a transverse steel pipe perpendicular to the longitudinal steel pipe is welded to the position near the steel plate below the longitudinal steel pipe; clamps are set at both ends of the steel plate, and the steel plate is fixed on the cable reel surface by the clamps; a circular ring is set at the outer end of the transverse steel pipe and the upper end of the longitudinal steel pipe as a guide ring.

[0012] The length of the lower end of the longitudinal steel pipe is longer than the height between the upper and lower disc surfaces of the cable drum, and the length of the transverse steel pipe is longer than the radius of the disc surface and shorter than the width of the gantry.

[0013] The "Y"-shaped support frame is welded into a "Y" shape using a rigid tubular material tube, and the overall surface is smooth.

[0014] The cable unwinding reel rotating bracket comprises two upper and lower iron plates with diameters larger than the cable reel, a hole is provided in the middle of the iron plates, a steel pipe with a height greater than the height of the cable reel passes through the hole of the upper iron plate and is fixed on the lower iron plate; a ball bearing track is welded along the periphery of the iron plate so that the upper iron plate can rotate along the track relative to the lower iron plate.

[0015] A hole of 300mm to 500mm is opened in the middle of the iron plate, and a steel pipe with a diameter equivalent to that of the central hole of the iron plate and a height higher than that of the cable reel is inserted into the hole, and the bottom of the steel pipe is firmly welded to the lower iron plate so that the upper iron plate can rotate 360° around the steel pipe as the center.

[0016] The cable laying method in mountain photovoltaic field includes the laying methods of DC photovoltaic cable and AC photovoltaic cable. The laying methods of AC photovoltaic cable are divided into two types: the line section from inverter to collector box and the line section from transformer to collector overhead tower.

[0017] The laying of DC photovoltaic cables uses a combination of a gantry, a cable-unrolling-out-of-reel fixing bracket, and a "Y"-shaped support frame. First, the gantry is assumed to be above the cable reel, and then the cable-unrolling-out-of-reel fixing bracket is installed on the cable reel, and the "Y"-shaped support frame is set in the direction of cable laying in sequence; finally, one end of the cable on the cable reel passes through the guide ring from bottom to top, is set above the gantry, and then passes through the "Y"-shaped support frame in sequence for laying;

[0018] The laying of the cable from the inverter to the collector box line section adopts a combination of a cable unrolling and reeling rotating bracket and a transport vehicle. The cable unrolling and reeling rotating bracket is placed on the transport vehicle, and the cable reel is fixed on the rotating bracket. The transport vehicle travels along the laying path to automatically lay the cable.

[0019] For laying of cables from the box-type transformer to the overhead tower section of the collector line, a combination of a cable unrolling and reeling rotating bracket, a "Y"-shaped support frame and a transport vehicle is used. The cable unrolling and reeling rotating bracket is set on the transport vehicle, the cable reel is fixed on the cable unrolling and reeling rotating bracket, and the "Y"-shaped support frame is set along the cable laying path; the transport vehicle moves around the array area where cable laying is required to carry out cable unrolling and laying.

[0020] When laying DC photovoltaic cables, two sets of gantries are used to achieve bidirectional laying, and multiple cable unwinding and reel fixing brackets are set in one gantry to achieve multi-channel parallel laying.

[0021] The cable unrolling reel rotating bracket is provided with a rotation regulating mechanism, which controls the rotation of the unrolling reel or stops the rotation according to the unrolling situation.

[0022] Compared with the prior art, the above invention has the following advantages or beneficial effects:

[0023] 1. Due to the use of door frames and support frames at the outlet, a certain height difference is maintained between the cable and the ground to avoid damage caused by friction between the cable and the ground. This method can automatically lay out the cable at the cable drum, reducing the cost of manual control, and the construction efficiency is much higher than the traditional method, which is popular among on-site workers.

[0024] 2. Through on-site practice, this method not only ensures the safety of operations in complex mountain construction environments, but also improves construction quality, increases construction efficiency, and reduces construction costs.

[0025] 3. The materials used in this device are common materials on the construction site, and the assembly process is simple. After use, it is easy to disassemble and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention and its features, appearance and advantages will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not drawn to scale, and emphasis is placed on illustrating the subject matter of the present invention.

[0027] Figure 1 It is a schematic diagram of the door frame structure of the present invention.

[0028] Figure 2 This is a structural diagram of the cable unwinding and reel fixing bracket of the present invention.

[0029] Figure 3 It is a schematic diagram of the "Y"-shaped support frame structure of the present invention.

[0030] Figure 4 The figure is a schematic diagram of the assembly of the DC photovoltaic cable laying tooling of the present invention.

[0031] Figure 5 It is a schematic diagram of the cable unwinding and reeling rotating bracket of the present invention.

[0032] Figure 6 This is a schematic diagram of the bracket and cable installation of the present invention.

[0033] Figure 7 This is a schematic diagram of the laying and assembly of the AC cable from the box-type transformer to the overhead tower section of the collector line of the present invention.

[0034] Among them, 1-gantry; 2-long steel plate; 3-longitudinal steel pipe; 4-transverse steel pipe; 5-guide ring; 6-clamp; 7-cable drum; 8-cable line; 9-"Y" type support frame; 10-upper iron plate; 11-lower iron plate; 12-ball bearing track; 13-steel pipe; 14-transport vehicle. DETAILED DESCRIPTION

[0035] The structure of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but is not intended to limit the present invention.

[0036] The cable laying device in mountain photovoltaic field includes a gantry, a cable unrolling and reeling fixed bracket, a "Y"-shaped support frame, and a cable unrolling and reeling rotating bracket; wherein, a cable guide ring is arranged on the cable unrolling and reeling fixed bracket; the gantry, the cable unrolling and reeling fixed bracket, and the "Y"-shaped support frame are used in combination for the laying of DC cables in photovoltaic fields; the cable unrolling and reeling rotating bracket and the transport vehicle are used in combination for the laying of AC cables from the box-type transformer to the 35kV collector box line section; the "Y"-shaped support frame, the cable unrolling and reeling rotating bracket and the transport vehicle are used in combination for the laying of AC cables from the box-type transformer to the collector line overhead tower section.

[0037] Specific embodiments, such as Figures 1 to 3 As shown,

[0038] The cable laying device for mountain photovoltaic fields comprises a gantry 1, a cable unrolling and reeling fixed bracket, a "Y"-shaped support frame 9, and a cable unrolling and reeling rotating bracket; wherein, a cable guide ring 5 is arranged on the cable unrolling and reeling fixed bracket; the gantry 1, the cable unrolling and reeling fixed bracket, and the "Y"-shaped support frame 9 are used in combination for the laying of DC cables in photovoltaic fields; the cable unrolling and reeling rotating bracket and the transport vehicle 14 are used in combination for the laying of AC cables in the line section from the transformer substation to the 35kV collector box; the "Y"-shaped support frame 9, the cable unrolling and reeling rotating bracket and the transport vehicle are used in combination for the laying of AC cables in the line section from the transformer substation to the collector line overhead tower.

[0039] The gantry 1 is formed by welding a rigid tubular material. In this embodiment, a rigid tubular material such as a steel pipe, square steel, or steel bar is welded into the gantry form, and the gantry 1 is firmly fixed to the ground. Figure 1 As shown; the surface of the material used for the gantry 1 must be smooth to avoid the cable from rubbing against the steel pipe and breaking the skin during the unrolling process; at the same time, the height of the gantry is required to be higher than the overall height of the cable reel unrolling tooling, and the width of the gantry is required to be wider than the diameter of the cable reel to be unrolled plus the cable reel spacing multiplied by the number of reels.

[0040] The cable unrolling reel fixing bracket includes a long steel plate 2 with a length greater than the diameter of the cable reel surface, a longitudinal steel pipe 3 movably connected to the center of the steel plate 2, and a transverse steel pipe 4 perpendicular to the longitudinal steel pipe 3 welded to the position below the longitudinal steel pipe 3 near the steel plate; clamps 6 are set at both ends of the steel plate, and the steel plate is fixed on the surface of the cable reel 7 by the clamps 6; a circular ring is set at the outer end of the transverse steel pipe 4 and the upper end of the longitudinal steel pipe 3 as a guide ring 5.

[0041] The length of the lower end of the longitudinal steel pipe 3 is longer than the height between the upper and lower disk surfaces of the cable drum 7, and the length of the transverse steel pipe 4 is longer than the disk radius and shorter than the width of the gantry (ie, door frame).

[0042] The "Y"-shaped support frame 9 is welded into a "Y" shape using a rigid tubular material pipe, and the overall surface is smooth. This embodiment uses a rigid tubular material pipe such as a steel pipe, square steel, or steel bar to weld a "Y" shape. Figure 3 The material used for the bracket must be smooth to prevent the cable from rubbing against the steel pipe and breaking the skin during the deployment process.

[0043] The cable unwinding reel rotating bracket includes two upper and lower iron plates with a diameter larger than the cable reel, a hole is opened in the middle of the iron plate, and a steel pipe 13 with a height greater than the height of the cable reel passes through the hole of the upper iron plate 10 and is fixed on the lower iron plate 11; a ball bearing track 12 is welded along the periphery of the iron plate, so that the upper iron plate can rotate along the track relative to the lower iron plate.

[0044] A hole of 300mm to 500mm is opened in the middle of the iron plate, and a steel pipe with a diameter equivalent to that of the central hole of the iron plate and a height higher than that of the cable reel is inserted into the hole, and the bottom of the steel pipe is firmly welded to the lower iron plate so that the upper iron plate can rotate 360° around the steel pipe as the center.

[0045] The cable laying method in mountain photovoltaic field includes the laying methods of DC photovoltaic cable and AC photovoltaic cable. The laying methods of AC photovoltaic cable are divided into two types: the line section from inverter to collector box and the line section from transformer to collector overhead tower.

[0046] The laying of DC photovoltaic cables uses a combination of a gantry, a cable-unrolling-out-of-reel fixing bracket, and a "Y"-shaped support frame. First, the gantry is assumed to be above the cable reel, and then the cable-unrolling-out-of-reel fixing bracket is installed on the cable reel, and the "Y"-shaped support frame is set in the direction of cable laying in sequence; finally, one end of the cable on the cable reel passes through the guide ring from bottom to top, is set above the gantry, and then passes through the "Y"-shaped support frame in sequence for laying;

[0047] The laying of the cable from the inverter to the collector box line section adopts a combination of a cable unrolling and reeling rotating bracket and a transport vehicle. The cable unrolling and reeling rotating bracket is placed on the transport vehicle, and the cable reel is fixed on the rotating bracket. The transport vehicle travels along the laying path to automatically lay the cable.

[0048] For laying of cables from the box-type transformer to the overhead tower section of the collector line, a combination of a cable unrolling and reeling rotating bracket, a "Y"-shaped support frame and a transport vehicle is used. The cable unrolling and reeling rotating bracket is set on the transport vehicle, the cable reel is fixed on the cable unrolling and reeling rotating bracket, and the "Y"-shaped support frame is set along the cable laying path; the transport vehicle moves around the array area where cable laying is required to carry out cable unrolling and laying.

[0049] Specific embodiments, such as Figures 1 to 7 As shown,

[0050] The cable laying method in mountain photovoltaic field includes the laying methods of DC photovoltaic cable and AC photovoltaic cable. The laying methods of AC photovoltaic cable are divided into two types: the line section from inverter to collector box and the line section from transformer to collector overhead tower.

[0051] 1. Construction method of DC cable installation in photovoltaic field

[0052] 1. Cable line unwinding tooling production

[0053] (1) To make the gantry, weld steel pipes, square steel, steel bars and other rigid tubular materials into a gantry and secure the gantry to the ground. Figure 1As shown. The material surface of the gantry must be smooth to prevent the cable from rubbing against the steel pipe during the deployment process. At the same time, the height of the gantry is required to be higher than the overall height of the cable reel deployment tooling, and the width of the gantry is required to be wider than the diameter of the cable reel to be deployed plus the cable reel spacing multiplied by the number of reels.

[0054] (2) Cable unrolling tooling production: prepare a steel plate with a length equivalent to the cable reel diameter and a moderate width, drill a hole equivalent to the diameter of the steel pipe in the center of the steel plate, weld clamps at both ends of the steel plate, and use the clamps to firmly fix the steel plate to the upper surface of the cable reel. Weld two steel pipes at right angles. The length of one steel pipe should be longer than the height of the upper and lower surfaces of the cable reel, and the length of the other steel pipe should be longer than the radius of the reel and shorter than the width of the gantry. Insert the side of the steel pipe longer than the height of the cable reel into the hole in the center of the steel plate to ensure that the right-angle steel pipe can rotate freely around the cable reel. At the same time, weld a ring on the side of the steel pipe longer than the radius of the cable reel. The diameter of the ring should be larger than the diameter of the DC cable.

[0055] (3) Lay the cable along the "Y"-shaped support frame, and weld the steel pipe, square steel, steel bar and other rigid tubular materials into a "Y" shape, such as Figure 3 The material used for the bracket must be smooth to prevent the cable from rubbing against the steel pipe and breaking the skin during the deployment process.

[0056] (4) Tooling assembly: The first step is to transport the cable drum to be laid to the flat ground around the square array area; the second step is to place the gantry above the cable drum and firmly fix it to the ground; the third step is to install the cable unwinding tooling on the cable drum. The fourth step is to pass the wire through the two guide rings of the tooling, and then pass the cable around the gantry and place it on the support frame. Figure 4 shown.

[0057] 2. Cable laying construction

[0058] Put the cable head into the ring and pass it around the horizontal steel pipe at the top of the gantry. When laying out the cable, just pull the cable lightly and the steel pipe with the ring will rotate around the cable drum, achieving the effect of automatic cable unwinding. Figure 2 shown.

[0059] This method can be used to lay multiple cable reels at the same time. If another set of gantries is set up in the other direction of the cable reel, bidirectional laying can be achieved.

[0060] 2. AC cable laying method for the line section from the box-type transformer to the 35kV collector box

[0061] (1) Production of the rotating bracket for the cable unwinding reel: Make two iron plates with a diameter larger than the cable reel, and open a hole of 300mm to 500mm in the middle of the iron plate. Weld a track with a width slightly larger than the bearing ball along the outer periphery of the iron plate. Insert a steel pipe with a diameter equivalent to the diameter of the hole in the center of the iron plate and a height equal to the height of the cable reel into the hole, and weld the bottom of the steel pipe to the lower iron plate firmly so that the upper iron plate can rotate 360° around the steel pipe as the center. Figure 5 shown.

[0062] (2) Loading operation: Lift the rotating bracket onto the transport vehicle. The width of the rear bucket of the transport vehicle must be greater than the width of the rotating bracket. After placing the bracket on the vehicle, firmly fix the bracket to the vehicle and lift the cable onto the rotating bracket. Figure 6 shown.

[0063] (3) During the cable laying construction, the vehicle travels along the laying route. Only one construction worker is required to be on the vehicle to rotate the cable drum. The cable is deployed from the cable drum as the vehicle rotates. The cable drum can be started and stopped at any time. At the same time, 3 to 5 workers are required to be arranged on the ground to safely place the deployed cable into the cable trench paved with sand to avoid being crushed and damaged by construction vehicles in the site, thus ensuring the safety of the cable.

[0064] 3. Method for laying AC cables from box-type transformer to overhead iron tower of collector line

[0065] (1) Production of the cable unwinding reel rotating bracket: make two iron plates with a diameter larger than the cable reel, and open a hole of 300mm to 500mm in the middle of the iron plate. Weld a track with a width slightly larger than the bearing ball along the outer periphery of the iron plate. Insert a steel pipe with a diameter equivalent to the diameter of the central hole of the iron plate and a height higher than the cable reel into the hole, and weld the bottom of the steel pipe to the lower iron plate firmly so that the upper iron plate can rotate 360° around the steel pipe as the center. Figure 6 shown.

[0066] (2) Lay the cable along the "Y"-shaped support frame, and weld the steel pipe, square steel, steel bar and other rigid tubular materials into a "Y" shape, such as Figure 7 The material used for the bracket must be smooth to prevent the cable from rubbing against the steel pipe and damaging the cable during the laying process.

[0067] (3) Loading operation: hoist the rotating bracket onto the transport vehicle. The width of the rear bucket of the transport vehicle must be greater than the width of the rotating bracket. After placing it on the vehicle, firmly fix the bracket to the vehicle and hoist the cable onto the rotating bracket.

[0068] (4) During the laying construction, the vehicle is driven to the area where the cable needs to be laid. Three to four workers are arranged at the cable end to pull the cable, and a worker is arranged on the vehicle to rotate the cable drum, unroll the cable from the drum, and slowly lay the cable forward on the cable support frame along the way.

[0069] Those skilled in the art should understand that those skilled in the art can implement variations by combining the prior art and the above embodiments, which will not be described in detail here. Such variations do not affect the essential content of the present invention, and will not be described in detail here.

[0070] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A cable laying device for mountain photovoltaic field, characterized by: It includes a gantry, a cable-unrolling-out-reel fixed bracket, a "Y"-shaped support frame, and a cable-unrolling-out-reel rotating bracket; among which, a cable guide ring is arranged on the cable-unrolling-out-reel fixed bracket; the gantry, the cable-unrolling-out-reel fixed bracket, and the "Y"-shaped support frame are used in combination for the laying of DC cables in photovoltaic fields; the cable-unrolling-out-reel rotating bracket and the transport vehicle are used in combination for the laying of AC cables from the box-type transformer to the 35kV collector box line section; the "Y"-shaped support frame, the cable-unrolling-out-reel rotating bracket and the transport vehicle are used in combination for the laying of AC cables from the box-type transformer to the collector line overhead tower section.

2. The cable laying device for mountain photovoltaic field according to claim 1, characterized in that: The gantry is formed by welding rigid tubular material tubes, the height of the gantry is higher than the overall height of the cable reel deployment fixing bracket, and the width of the gantry is wider than the diameter of the cable reel to be deployed plus the cable reel spacing multiplied by the number of reels.

3. The cable laying device for mountain photovoltaic field according to claim 1, characterized in that: The cable unrolling reel fixing bracket includes a long steel plate whose length is greater than the diameter of the cable reel surface. The center of the steel plate is movably connected to the longitudinal steel pipe. A transverse steel pipe perpendicular to the longitudinal steel pipe is welded to the position near the steel plate below the longitudinal steel pipe. Clamps are set at both ends of the steel plate to fix the steel plate on the cable reel surface. A circular ring is set at the outer end of the transverse steel pipe and the upper end of the longitudinal steel pipe as a guide ring.

4. The cable laying device for mountain photovoltaic field according to claim 3 is characterized in that: The length of the lower end of the longitudinal steel pipe is longer than the height between the upper and lower disc surfaces of the cable drum, and the length of the transverse steel pipe is longer than the radius of the disc surface and shorter than the width of the gantry.

5. The cable laying device for mountain photovoltaic field according to claim 1, characterized in that: The "Y"-shaped support frame is welded into a "Y" shape using a rigid tubular material tube, and the overall surface is smooth.

6. The cable laying device for mountain photovoltaic field according to claim 1, characterized in that: The cable unwinding reel rotating bracket comprises two upper and lower iron plates with diameters larger than the cable reel, a hole is provided in the middle of the iron plates, a steel pipe with a height greater than the height of the cable reel passes through the hole of the upper iron plate and is fixed on the lower iron plate; a ball bearing track is welded along the periphery of the iron plate so that the upper iron plate can rotate along the track relative to the lower iron plate.

7. The cable laying device for mountain photovoltaic field according to claim 6, characterized in that: A hole of 300mm to 500mm is opened in the middle of the iron plate, and a steel pipe with a diameter equivalent to that of the central hole of the iron plate and a height higher than that of the cable reel is inserted into the hole, and the bottom of the steel pipe is firmly welded to the lower iron plate so that the upper iron plate can rotate 360° around the steel pipe as the center.

8. A method for laying cables in a mountain photovoltaic field based on the device according to any one of claims 1 to 7, characterized in that: It includes the laying methods of DC photovoltaic cables and AC photovoltaic cables. The laying of AC photovoltaic cables is divided into two laying methods: the inverter to the collector box section and the box transformer to the collector line overhead tower section. The laying of DC photovoltaic cables adopts a combination of a gantry, a cable-unfolding-out-of-reel fixing bracket, and a "Y"-shaped support frame. First, the gantry is assumed to be above the cable reel, and then the cable-unfolding-out-of-reel fixing bracket is installed on the cable reel, and the "Y"-shaped support frame is successively set along the cable laying direction; finally, one end of the cable on the cable reel passes through the guide ring from bottom to top, is set above the gantry, and then passes through the "Y"-shaped support frame in sequence for laying; The laying of the cable from the inverter to the collector box line section adopts a combination of a cable unrolling and reeling rotating bracket and a transport vehicle. The cable unrolling and reeling rotating bracket is placed on the transport vehicle, and the cable reel is fixed on the rotating bracket. The transport vehicle travels along the laying path to automatically lay the cable. For laying of cables from the box-type transformer to the overhead tower section of the collector line, a combination of a cable unrolling and reeling rotating bracket, a "Y"-shaped support frame and a transport vehicle is used. The cable unrolling and reeling rotating bracket is set on the transport vehicle, the cable reel is fixed on the cable unrolling and reeling rotating bracket, and the "Y"-shaped support frame is set along the cable laying path; the transport vehicle moves around the array area where cable laying is required to carry out cable unrolling and laying.

9. The cable laying method for mountain photovoltaic field according to claim 8, characterized in that: When laying DC photovoltaic cables, two sets of gantries are used to achieve bidirectional laying, and multiple cable unwinding and reel fixing brackets are set in one gantry to achieve multi-channel parallel laying.

10. The cable laying method for mountain photovoltaic field according to claim 8, characterized in that: The cable unrolling reel rotating bracket is provided with a rotation regulating mechanism, which controls the rotation of the unrolling reel or stops the rotation according to the unrolling situation.

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