Water surface photovoltaic cable laying device and use method thereof

Abstract

The invention relates to a water surface photovoltaic cable laying device and a use method thereof, the water surface photovoltaic cable laying device comprises a door-shaped cable bridge and a water surface cable floating body, the door-shaped cable bridge is used for floating and laying a water surface photovoltaic cable on the water surface of a field area in an overhead mode, and the door-shaped cable bridge is at least arranged at the intersection position of a cable laying path and a channel path; the water surface cable floating body is used for floating and laying a water surface photovoltaic cable on the water surface of a field area in a manner of being close to the water surface, and is arranged in an area which is on a cable laying path and does not interfere with a channel path; an automatic leveling mechanism is arranged on the door-shaped cable bridge, and the automatic leveling mechanism is used for controlling the door-shaped cable bridge to keep a static posture by automatically adjusting the weight and the actual immersion depth under the wind action or manned condition. According to the invention, the navigation requirement below the cable can be met, and the stability of the laying device in use can be automatically maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of floating cables, and in particular to a laying device for a water surface photovoltaic cable and a use method thereof. Background Art

[0002] As is known, floating photovoltaic technology is a power generation technology that combines photovoltaic modules with floating bodies and places them on the water surface. Compared with traditional ground photovoltaic technology, floating photovoltaic technology does not occupy land resources, water has a cooling effect on photovoltaic modules, can reduce evaporation from the water surface, inhibit algae reproduction, and protect water resources.

[0003] At present, in the known floating photovoltaic power stations on the water surface, the photovoltaic power collection line cables are usually installed and laid using floating bodies, such as CN210780025U and CN205945592U. Since the existing laying methods all place the cables together with the floating bodies close to the water surface, the cable laying path formed by the water surface design in the field area often hinders the layout of the waterway and is not conducive to daily inspections. In view of this situation, if the cable path is changed to solve the problem, it will increase the investment cost.

[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0005] The present invention aims to solve one of the technical problems in the related art to at least some extent. To this end, the present invention proposes a laying device for a water surface photovoltaic cable and a method for using the same, which can not only meet the navigation requirements under the cable, but also automatically maintain the stability of the laying device during use.

[0006] A water surface photovoltaic cable laying device according to the present invention comprises:

[0007] The gate-type cable tray is used to lay the water-surface photovoltaic cable in an overhead manner on the water surface of the site, and it is at least arranged at the intersection of the cable laying path and the waterway path;

[0008] The surface cable float is used to float the surface photovoltaic cable on the water surface of the site in a manner close to the water surface, and is set on the cable laying path and in an area that does not interfere with the waterway path;

[0009] Among them, the portal type cable tray is provided with an automatic leveling mechanism, which is used to keep the portal type cable tray in a static posture by automatically adjusting the weight and actual draft depth control under the action of wind or when there are people on board.

[0010] According to some embodiments of the present invention, the portal-type cable tray includes two floating foundations and a portal-type ladder frame, wherein the portal-type ladder frame is fixedly disposed between the two floating foundations, and the water surface inside the portal-type ladder frame can be used as a navigation channel path.

[0011] According to some embodiments of the present invention, each floating body foundation includes a square concrete platform and four cylindrical pontoons evenly arranged on the four sides of the square concrete platform. The portal ladder frame is arranged on the central connection of the square concrete platforms of the two floating body foundations. The first cylindrical pontoon and the second cylindrical pontoon located on both sides of the portal ladder frame each have an inner cavity. The interiors of the third cylindrical pontoon and the fourth cylindrical pontoon corresponding to the portal ladder frame are divided into two independent inner cavities by a pontoon partition.

[0012] According to some embodiments of the present invention, the surface photovoltaic cable is laid along the outer surface of the portal ladder frame, and the surface photovoltaic cable is coiled on two square concrete platforms to form a cable surplus cable.

[0013] According to some embodiments of the present invention, a carbon corrugated tube is provided on the outside of the water surface photovoltaic cable and is fixedly connected to a door-type ladder frame via a clamp.

[0014] According to some embodiments of the present invention, the automatic leveling mechanism includes a photovoltaic power supply unit, a pump and a control unit, a gyroscope, and a water level monitor, all of which are arranged on the square concrete platform; each inner cavity of all cylindrical floats is individually connected to a pump and a control unit for individually regulating the amount of water in each inner cavity to change the volume and weight of each cylindrical float; the photovoltaic power supply unit is electrically connected to the pump and the control unit for providing electrical energy; the gyroscope is communicatively connected to the pump and the control unit for monitoring the inclination angle of the square concrete platform; the water level monitor is communicatively connected to the pump and the control unit for monitoring the waterline depth of the square concrete platform.

[0015] A method for using a water surface photovoltaic cable laying device according to the present invention comprises the following steps:

[0016] 1) Use the laying device to install the water surface photovoltaic cable overhead;

[0017] 2) Use a water level monitor to measure the waterline depth H of the square concrete platform;

[0018] 3) Using a gyroscope to measure the tilt angle α of the square concrete platform;

[0019] 4) The pump and the control unit are used to adjust the amount of water in each cylindrical buoy according to the waterline depth H and the inclination angle α so as to keep the entire door-type cable tray in a static posture.

[0020] According to some embodiments of the present invention, in step 4), the leveling parameters of the pump and the control unit include the actual draft of the square concrete platform and the minimum volume of a single cylindrical buoy to keep the entire square concrete platform from tipping over under the action of wind;

[0021] The actual draft of the square concrete platform is calculated according to the following formula:

[0022] h = H·cosα;

[0023] The relationship function between the mass n of a single cylindrical float and the corresponding volume Φ is defined as Φ (n) ,but

[0024]

[0025] Where α max is the maximum tilt angle corresponding to the square concrete platform being blown down, Δh max is the maximum actual draft change corresponding to the square concrete platform being blown down, F max is the maximum wind speed corresponding to the collapse of the square concrete platform, ρ is the density of water, g is the acceleration of gravity, so

[0026]

[0027] to its minimum value.

[0028] According to some embodiments of the present invention, in step 4), the pump and control unit also determine whether there is water in the cylindrical buoy / square concrete platform or correct the cumulative error of the water injection / discharge flow rate by the mass of the door-type cable tray and the waterline depth in the windless and waterless state:

[0029]

[0030] Where M represents the total mass of the square concrete platform and its belongings, m1 represents the total mass of the first cylindrical buoy on the left side of the windward side, m2 represents the total mass of the third and fourth cylindrical buoys located on the left side of the buoy bulkhead, m3 represents the total mass of the third and fourth cylindrical buoys located on the right side of the buoy bulkhead, m4 represents the total mass of the second cylindrical buoy on the right side of the windward side, h0 represents the actual draft without wind force, 0 represents the α value without wind force, and Ψ (h，α) It is the draft volume of the floating body foundation.

[0031] According to the present invention, a water surface photovoltaic cable laying device and its use method can, on the one hand, utilize a combination of a gate-type cable tray and a water surface cable float to realize the coexistence of the cable laying path and the waterway path. In particular, the overhead gate-type cable tray is not only simple to construct and install, but also avoids the obstruction of the waterway path by the cable laying path. On the other hand, the automatic leveling mechanism provided on the gate-type cable tray can ensure the long-term stability of the laying device. Therefore, the later operation and maintenance does not need to replace the existing cables, and the shaking of the device is reduced, which reduces the cost and improves the safety.

[0032] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0034] Figure 1 It is a schematic diagram of the main structure of a device for laying water surface photovoltaic cables according to some embodiments of the present invention.

[0035] Figure 2 The figure is a schematic diagram of the top view of the structure of a device for laying a water surface photovoltaic cable according to some embodiments of the present invention.

[0036] Figure 3 It is a schematic diagram of the side structure of a device for laying a water surface photovoltaic cable according to some embodiments of the present invention.

[0037] Figure 4 This is a simplified diagram of the mass of the floating foundation in the installation of the water surface photovoltaic cable in some embodiments of the present invention.

[0038] Figure 5 The present invention is a schematic diagram of the forces acting on a portal ladder frame in a water surface photovoltaic cable laying device under the action of a breeze in some embodiments of the present invention.

[0039] Figure 6 The present invention is a schematic diagram of the forces acting on a portal ladder frame in a water surface photovoltaic cable laying device under the action of strong winds in some embodiments of the present invention.

[0040] Meaning of reference numerals in the figure:

[0041] 100-door type cable tray;

[0042] 110-floating body foundation; 111-square concrete platform; 112-cylindrical pontoon; 1121-first cylindrical pontoon; 1122-second cylindrical pontoon; 1123-third cylindrical pontoon; 1124-fourth cylindrical pontoon; 1125-pontoon diaphragm;

[0043] 120-door type ladder frame;

[0044] 200-surface cable buoy;

[0045] 300-Automatic leveling mechanism;

[0046] 310- Photovoltaic power supply unit;

[0047] 320- pump and control unit;

[0048] 330 - gyroscope;

[0049] 340-water level monitor;

[0050] 400-water surface photovoltaic cable;

[0051] 410- cable surplus cable;

[0052] 420-carbon bellows;

[0053] 430-Holding hoop;

[0054] The meaning of the letters in the figure:

[0055] M-total mass of the square concrete platform and its belongings, m1-total mass of the first cylindrical buoy on the left side of the windward side, m2-total mass of the third cylindrical buoy and the fourth cylindrical buoy located on the left side of the buoy bulkhead, m3-total mass of the third cylindrical buoy and the fourth cylindrical buoy located on the right side of the buoy bulkhead, m4-total mass of the second cylindrical buoy on the right side of the windward side;

[0056] P1-the center of gravity of the entire portal cable tray (including the water surface photovoltaic cable and the automatic leveling mechanism) when tilted in a breeze, F1-the force in a breeze, G1-the gravity of the entire portal cable tray in a breeze, α1-the inclination angle of the floating body foundation in a breeze;

[0057] P2-the center of gravity of the entire portal cable tray (including the water surface photovoltaic cable and the automatic leveling mechanism) when tilted by strong winds, F2-the force during strong winds, G2-the gravity of the entire portal cable tray during strong winds, α2-the inclination angle of the floating foundation during strong winds. DETAILED DESCRIPTION

[0058] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0059] The water floating photovoltaic power station in the related technology, for example, a known water floating power station cable laying structure (CN210780025U), in which the cable is directly fixed to the floating body by means of a cable clamp, and then floats on the water surface through the floating body; another known water floating photovoltaic power station (CN205945592U), in which the cable is fixed to the buoy through a support platform, and then floats on the water surface through the buoy.

[0060] It can be seen that in the above-mentioned existing floating photovoltaic power stations, during the laying process, the cables of the photovoltaic power collection lines are usually installed and laid using a single type of floating body or buoy, and these floating bodies or buoys make the cables close to the water surface. The cable laying path designed on the water surface of the site finally forms a problem of obstructing the layout of the waterway and being unfavorable for daily inspections. If the cable path is dismantled and rebuilt to solve this problem, the investment cost is too high.

[0061] In view of this, the application embodiment of the present invention aims to provide a device for laying photovoltaic cables on the water surface, which not only meets the navigation requirements under the cable by setting an overhead portal cable tray on the waterway without replacing the existing cable and changing the cable laying path, but also uses an automatic leveling mechanism to make the operation and maintenance of the laying device more stable, thereby solving the above-mentioned problems. In addition, the application embodiment of the present invention aims to provide a method for using a device for laying photovoltaic cables on the water surface, which can firstly determine whether there is water in the buoy or correct the cumulative error of the water injection / discharge flow rate, thereby solving the problem of overall sinking of the portal cable tray caused by water seepage in the buoy or concrete platform, or imbalance of the floating foundations on both sides due to the cumulative error, and secondly, can calculate the minimum value of the volume of a single buoy under stress, thereby knowing the limit conditions for satisfying the entire laying device not to be blown down by the wind.

[0062] According to the following Figure 1-Figure 6 A laying device for a water surface photovoltaic cable 400 and a method for using the same are described in detail.

[0063] like Figure 1-Figure 3As shown, an embodiment of the present invention provides a laying device for a water surface photovoltaic cable 400, comprising a portal cable tray 100 and a water surface cable buoy 200, wherein the portal cable tray 100 is used to lay the water surface photovoltaic cable 400 in an overhead manner in a floating manner on the water surface of the site, and it is at least arranged at the intersection of the cable laying path and the waterway path; the water surface cable buoy 200 is used to lay the water surface photovoltaic cable 400 in a floating manner close to the water surface, and it is arranged on the cable laying path and in an area that does not interfere with the waterway path; wherein, an automatic leveling mechanism 300 is provided on the portal cable tray 100, and the automatic leveling mechanism 300 is used to keep the portal cable tray 100 in a static posture by automatically adjusting the weight and actual draft control under the action of wind or when people are on board. The static posture here refers to the self-balancing posture when not affected by external forces. The automatic leveling mechanism 300 of the embodiment of the present invention can automatically adjust the door-type cable tray 100 to maintain a self-balancing posture when subjected to external forces (i.e. wind force or people).

[0064] Please refer to Figure 1 The portal cable tray 100 of the embodiment of the present invention may include two floating foundations 110 and a portal ladder frame 120. The portal ladder frame 120 is fixedly disposed between the two floating foundations 110, and the water surface inside the portal ladder frame 120 can be used as a navigation channel path.

[0065] The structural arrangement of two floating foundations 110 and a portal ladder frame 120 not only has the advantages of simple construction, low construction cost and convenient installation, but also allows ships to pass through the middle of the portal cable tray 100 without hindrance, without replacing existing cables or changing the cable laying path, thus meeting the navigation requirements under the cables.

[0066] Please refer to Figure 2 and Figure 3 Each floating body foundation 110 of the embodiment of the present invention may include a square concrete platform 111 and four cylindrical pontoons 112 evenly arranged around the four sides of the square concrete platform 111. The gate-type ladder frame 120 is arranged at the center connection of the square concrete platforms 111 of the two floating body foundations 110. The first cylindrical pontoon 1121 and the second cylindrical pontoon 1122 located on both sides of the gate-type ladder frame 120 each have an inner cavity. The interiors of the third cylindrical pontoon 1123 and the fourth cylindrical pontoon 1124 corresponding to the gate-type ladder frame 120 are equally divided into two independent inner cavities by a pontoon partition 1125 (see Figure 3 ).

[0067] Please continue to refer to Figure 1 and 2 The water surface photovoltaic cable 400 of the embodiment of the present invention can be laid along the outer surface of the door-type ladder frame 120 (i.e. along the Figure 1 , 2In the direction from left to right or from right to left in the figure, it is attached to the surface of the door-shaped ladder frame 120), and at the same time, the water surface photovoltaic cable 400 is coiled on the two square concrete platforms 111 to form a cable surplus cable 410 (see Figure 2 ).

[0068] Reference Figure 1 The exterior of the water surface photovoltaic cable 400 of the embodiment of the present invention may preferably be wrapped with a carbon corrugated tube 420 , and more specifically, may be fixedly connected to the door-type ladder frame 120 via a clamp 430 .

[0069] The carbon corrugated tube 420 and the cable surplus cable 410 are both designed to optimize cable protection and operation convenience during the installation process.

[0070] Reference Figure 2 The automatic leveling mechanism 300 of the embodiment of the present invention includes a photovoltaic power supply unit 310, a pump and control unit 320, a gyroscope 330, and a water level monitor 340, all of which are arranged on the square concrete platform 111; each inner cavity of all cylindrical floats 112 is individually connected to the pump and control unit 320, which is used to individually adjust the amount of water in each inner cavity to change the volume and weight of each cylindrical float 112; the photovoltaic power supply unit 310 is electrically connected to the pump and control unit 320 for providing electrical energy; the gyroscope 330 is communicated with the pump and control unit 320 for monitoring the inclination angle of the square concrete platform 111; the water level monitor 340 is communicated with the pump and control unit 320 for monitoring the waterline depth of the square concrete platform 111.

[0071] In specific implementation, the first cylindrical buoy 1121 and the second cylindrical buoy 1122 are each provided with a buoy water inlet and a buoy water outlet, and the third cylindrical buoy 1123 and the fourth cylindrical buoy 1124 are each provided with two buoy water inlets and two buoy water outlets, which are divided into two groups corresponding to the two inner cavities respectively; the buoy water inlet and the buoy water outlet are used to connect the pump and the pump in the control unit 320 through the buoy water inlet pipe and the buoy water outlet pipe. Furthermore, a pump water inlet and a pump water outlet are provided on the upper and lower sides of the pump for connecting the buoy water inlet pipe and the buoy water outlet pipe, and further, a device for measuring the water injection and discharge flow rate, such as a flow meter, can be provided at the pump water inlet and the pump water outlet; a pump water inlet pipe and a pump water outlet pipe are also provided on the left and right sides of the pump for connecting to the water surface.

[0072] The embodiment of the present invention can use the pump and the control unit 320 to adjust the amount of water in the buoy so that the buoy can be more stable when maintenance personnel enter the floating foundation 110, thereby reducing the risk of falling into the water due to an unstable platform.

[0073] More specifically, when the draft H of the concrete platforms of the two floating foundations 110 on the left and right sides is inconsistent, the drafts on both sides are balanced by controlling the pump and control unit 320 on the square concrete platform 111 on the side with the deep draft to inject water at the same time, and the pump and control unit 320 on the other square concrete platform 111 on the side with the shallow draft to release water at the same time; when the inclination angle α is greater than the theoretical maximum value, the pump and control unit 320 can be adjusted to release water on the inclined side and inject water on the opposite side to achieve an inclination angle less than the maximum.

[0074] The adjustment amount is determined based on the draft H and the tilt angle α of the floating foundations 110 on both sides after water injection and water release, until the draft H of the concrete platforms of the two floating foundations 110 on both sides is consistent and the tilt angle α is less than or equal to the theoretical maximum value.

[0075] The embodiment of the present invention further provides a method for using a device for laying a water surface photovoltaic cable 400, comprising the following steps:

[0076] 1) Using a laying device to carry out overhead laying and installation of the water surface photovoltaic cable 400;

[0077] 2) Using the water level monitor 340 to measure the waterline depth H of the square concrete platform 111;

[0078] 3) Using the gyroscope 330 to measure the tilt angle α of the square concrete platform 111;

[0079] 4) The pump and control unit 320 adjusts the amount of water in each cylindrical buoy 112 according to the waterline depth H and the inclination angle α so as to keep the entire door-type cable tray 100 in a static posture.

[0080] In step 4) of the embodiment of the present invention, the leveling parameters of the pump and control unit 320 include the actual draft of the square concrete platform 111 and the minimum volume of the single cylindrical buoy 112 to keep the entire square concrete platform 111 from tipping over under the action of wind;

[0081] The actual draft of the square concrete platform 111 is calculated according to the following formula:

[0082] h = H·cosα;

[0083] The relationship function between the mass n of a single cylindrical float 112 and the corresponding volume Φ is defined as Φ (n) ,but

[0084]

[0085] Where α max is the maximum tilt angle corresponding to the square concrete platform 111 being blown down, Δhmax is the maximum actual draft change corresponding to the square concrete platform 111 being blown down, F max is the maximum wind speed corresponding to the square concrete platform 111 being blown down, ρ is the density of water, g is the acceleration of gravity, so

[0086]

[0087] to its minimum value.

[0088] In step 4) of the embodiment of the present invention, the pump and control unit 320 also determines whether there is water in the cylindrical buoy 112 / square concrete platform 111 or corrects the cumulative error of the water injection / discharge flow rate by the mass of the door-type cable tray 100 and the waterline depth in the windless and water-free state:

[0089]

[0090] Wherein, M represents the total mass of the square concrete platform 111 and its belongings, m1 represents the total mass of the first cylindrical buoy 1121 on the left side of the windward side, m2 represents the total mass of the third cylindrical buoy 1123 and the fourth cylindrical buoy 1124 located on the left side of the buoy bulkhead 1125, m3 represents the total mass of the third cylindrical buoy 1123 and the fourth cylindrical buoy 1124 located on the right side of the buoy bulkhead 1125, m4 represents the total mass of the second cylindrical buoy 1122 on the right side of the windward side, h0 represents the actual draft without wind force, 0 represents the α value without wind force, and Ψ (h，α) is the draft volume of the floating foundation 110.

[0091] More specifically, when the water is released from the inner cavity of each cylindrical buoy 112 without being affected by wind, the waterline depth h0 should be consistent with the initial depth draft. If it is inconsistent, it means that there is still water in the cylindrical buoy 112 or the square concrete platform 111, or there is water leakage in the concrete platform.

[0092] The use method of the embodiment of the present invention is specifically implemented as follows:

[0093] Assume that H is the waterline depth measured by the water level monitor 340, α is the inclination angle of the square concrete platform 111 relative to the horizontal plane measured by the gyroscope 330, and h=H·cosα represents the actual water depth of the floating platform.

[0094] Since it is relatively difficult to obtain the change in the draft volume of each cylindrical pontoon 112 or square concrete platform 111, the corresponding relationship between the internal space volume and the draft line can be obtained by using 3D computer modeling during the construction of the cylindrical pontoon 112 and the square concrete platform 111. That is, the actual draft depth h and the inclination angle α have a unique corresponding draft volume Ψ of the floating foundation 110. (h，α) Corresponding to it.

[0095] Therefore, when there is no wind force, the waterline depth is h0, α=0,

[0096]

[0097] Obviously, this formula can be used to determine whether there is water in the buoy or correct the cumulative error of the water injection / discharge flow rate based on the mass of the floating foundation 110 and the waterline depth in a windless and water-free state.

[0098] Reference Figure 4 , M represents the total mass of the concrete platform and its belongings; m1 represents the total mass of the first cylindrical buoy 1121; m2 represents the total mass of the third cylindrical buoy 1123 and the fourth cylindrical buoy 1124 located on the left side of the buoy diaphragm 1125; m3 represents the total mass of the third cylindrical buoy 1123 and the fourth cylindrical buoy 1124 located on the right side of the buoy diaphragm 1125; m4 represents the total mass of the second cylindrical buoy 1122. Then Δm1, Δm2, Δm3, and Δm4 can be used to represent the mass of water filling / discharging of the four types of buoys after being affected by wind.

[0099] Correspondingly, V0 represents the volume of the concrete platform below the water surface when there is no wind and no water injection; V1 represents the volume of the first pontoon below the water surface when there is no wind and no water injection; V2 represents the volume of the third pontoon below the water surface when there is no wind and no water injection; V3 represents the volume of the fourth pontoon below the water surface when there is no wind and no water injection; V4 represents the volume of the second pontoon below the water surface when there is no wind and no water injection. Then, ΔV0, ΔV1, ΔV2, ΔV3, and ΔV4 can be used to represent the changes in the volumes of the square concrete platform 111 and the four cylindrical pontoons 112 below the water surface after being affected by wind, respectively.

[0100] Refer to 5 and Figure 6 , when the wind speed is light wind or strong wind, there are two formulas as follows:

[0101] (M+2m1+4m2+4m3+2m4)g=ρg(V0+2V1+4V2+4V3+2V4)(2Δm1+4Δm2+4Δm3+2Δm4)=ρg(ΔV0+2ΔV1+4ΔV2+4ΔV3+2ΔV4)

[0102] Obviously, the difference in the above formulas is that the masses of Δm1, Δm2, Δm3, Δm4 in the two formulas are different, and the volumes of ΔV0, ΔV1, ΔV2, ΔV3, ΔV4 are different.

[0103] It should be noted here that there is no linear correlation between Δm1 and ΔV1, Δm2 and ΔV2, Δm3 and ΔV3, and Δm4 and ΔV4. This is because as the floating foundation 110 tilts due to wind force, the draft depth is not a constant value, which results in different buoyancy.

[0104] Assume that the flow rate of the pump and control unit 320 to each buoy is ν1, ν2, ν3, ν4, and the corresponding water filling / discharging time is t1, t2, t3, t4. Assume that the size of the drainage pipe orifice is S. Therefore, the flow rate, time, and orifice cross section of the pump and control unit 320 can be used to calculate:

[0105] Δm1=ν1·t1·S

[0106] Δm2=ν2·t2·S

[0107] Δm3=ν3·t3·S

[0108] Δm4=ν4·t4·S

[0109] The change in the mass of water injected or released into the four cylindrical buoys 112 can be calculated according to the above formula.

[0110] Let Δh represent the draft when it is relatively free from wind force, and the corresponding inclination angle α at this time, then:

[0111] (2Δm1+4Δm2+4Δm3+2Δm4)g=ρgΨ (Δh，α)

[0112] After finding the local maximum extreme wind speed μ over many years, it is assumed that the shape of the buoy has no correlation with the force F of the wind blowing on the bridge frame.

[0113] According to laboratory simulation, the maximum inclination angle α corresponding to the blown-down square concrete platform 111 can be obtained. max , and the maximum actual draft change Δh max , and the force F corresponding to the maximum wind speed max It can be obtained through experimental measurement. According to the above formula:

[0114]

[0115] Assume that the relationship function between the mass n of a single cylindrical float 112 and the corresponding volume Φ is Φ (n) ,according to Figure 5 and Figure 6Force analysis shows that this extreme condition cannot be achieved in a breeze. Figure 6 The best condition is that the first cylindrical buoy 1121 on the left side leaves the water surface, all the buoy cavities on the left side of the buoy partition 1125 of the third cylindrical buoy 1123 and the fourth cylindrical buoy 1124 are filled with water, the fourth buoy on the right side is pumped out of water, and the force on the upper right corner of the square concrete platform 111 is the largest when it touches the water surface. At this time,

[0116] F max ≤(M+8n)g+4ρΦ (n) g)·tan(α max )

[0117] According to this formula, we can get the function about n:

[0118]

[0119] Therefore, according to the above formula, we can get Φ (n) Minimum value of:

[0120]

[0121] It can be seen that the method of using the embodiment of the present invention, based on the use process of the automatic leveling mechanism 300, also realizes the determination of whether there is water in the buoy through the mass of the floating body foundation 110 and the waterline depth in the state of no wind and no water inflow, so as to facilitate timely maintenance of the cylindrical buoy 112 or the square concrete platform 111, or correct the cumulative error of the water injection / discharge flow rate, and eliminate the cumulative error of the pump and control unit 320, so as to make the control more accurate and ensure the safety of the platform. Through force analysis, under the assumptions, it can be calculated that the relationship function between the mass n of a single buoy and the corresponding volume Φ is Φ (n) The minimum volume of the middle buoy is required to prevent the entire platform from being blown over by the wind.

[0122] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0123] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0124] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0125] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any simple modifications and equivalent changes made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. A device for laying a water surface photovoltaic cable, characterized in that: include: A gate-type cable tray, which is used to float and lay the water surface photovoltaic cable on the water surface of the site in an overhead manner, and is at least arranged at the intersection of the cable laying path and the waterway path; A surface cable float, which is used to float and lay the surface photovoltaic cable on the water surface of the site in a manner close to the water surface, and is arranged on the cable laying path and in an area that does not interfere with the waterway path; Wherein, the portal cable tray is provided with an automatic leveling mechanism, which is used to control the portal cable tray to maintain a static posture by automatically adjusting the weight and actual draft depth under the action of wind or when people are on board.

2. The device for laying a water surface photovoltaic cable according to claim 1, characterized in that: The portal-type cable tray comprises two floating foundations and a portal-type ladder frame. The portal-type ladder frame is fixedly arranged between the two floating foundations, and the water surface inside the portal-type ladder frame can be used as a navigation channel path.

3. The device for laying a water surface photovoltaic cable according to claim 2, characterized in that: Each of the floating body foundations includes a square concrete platform and four cylindrical pontoons evenly arranged on the four sides of the square concrete platform. The portal ladder frame is arranged on the central connection of the square concrete platforms of the two floating body foundations. The first cylindrical pontoon and the second cylindrical pontoon located on both sides of the portal ladder frame each have an inner cavity. The interiors of the third cylindrical pontoon and the fourth cylindrical pontoon corresponding to the portal ladder frame are equally divided into two independent inner cavities by a pontoon partition.

4. The device for laying a water surface photovoltaic cable according to claim 3, characterized in that: The water surface photovoltaic cable is laid along the outer surface of the portal ladder frame, and at the same time, the water surface photovoltaic cable is coiled on two square concrete platforms to form cable surplus cables.

5. The device for laying a water surface photovoltaic cable according to claim 4, characterized in that: The surface photovoltaic cable is wrapped with a carbon corrugated tube on the outside and is fixedly connected to the door-type ladder frame via a clamp.

6. The device for laying a water surface photovoltaic cable according to claim 3, 4 or 5, characterized in that: The automatic leveling mechanism includes a photovoltaic power supply unit, a pump and a control unit, a gyroscope, and a water level monitor, all of which are arranged on the square concrete platform; each of the inner cavities of all the cylindrical floats is individually connected to the pump and the control unit, which is used to individually adjust the amount of water in each inner cavity to change the volume and weight of each cylindrical float; the photovoltaic power supply unit is electrically connected to the pump and the control unit for providing electrical energy; the gyroscope is communicatively connected to the pump and the control unit for monitoring the inclination angle of the square concrete platform; the water level monitor is communicatively connected to the pump and the control unit for monitoring the waterline depth of the square concrete platform.

7. A method for using the device for laying a water surface photovoltaic cable as claimed in claim 6, characterized in that: The following steps are involved: 1) Using the laying device to carry out overhead laying and installation of the water surface photovoltaic cable; 2) using the water level monitor to measure the waterline depth H of the square concrete platform; 3) using the gyroscope to measure the inclination angle α of the square concrete platform; 4) The pump and the control unit are used to adjust the amount of water in each cylindrical buoy according to the waterline depth H and the inclination angle α so as to keep the entire door-type cable tray in a static posture.

8. The method for using the water surface photovoltaic cable according to claim 7, characterized in that: In step 4), the leveling parameters of the pump and the control unit include the actual draft of the square concrete platform and the minimum volume of a single cylindrical buoy to keep the entire square concrete platform from tipping over under the action of wind; The actual draft of the square concrete platform is calculated according to the following formula: h = H·cosα; The relationship function between the mass n of a single cylindrical float and the corresponding volume Φ is defined as Φ (n) ,but Where α max is the maximum tilt angle at which the square concrete platform can be blown down, Δh max is the maximum actual draft change corresponding to the square concrete platform being blown down, F max is the maximum wind speed corresponding to the collapse of the square concrete platform, ρ is the density of water, g is the acceleration of gravity, so to its minimum value.

9. The method for using the water surface photovoltaic cable according to claim 8, characterized in that: In step 4), the pump and control unit also determine whether there is water in the cylindrical buoy / square concrete platform or correct the cumulative error of the water injection / discharge flow rate by the mass of the door-type cable tray and the waterline depth in the windless and water-free state: Where M represents the total mass of the square concrete platform and its belongings, m1 represents the total mass of the first cylindrical buoy on the left side of the windward side, m2 represents the total mass of the third and fourth cylindrical buoys located on the left side of the buoy bulkhead, m3 represents the total mass of the third and fourth cylindrical buoys located on the right side of the buoy bulkhead, m4 represents the total mass of the second cylindrical buoy on the right side of the windward side, h0 represents the actual draft without wind force, 0 represents the α value without wind force, and Ψ (h，α) It is the draft volume of the floating body foundation.

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