Cantilever type photovoltaic device

Abstract

The utility model relates to the field of solar energy, in particular to a cantilever type photovoltaic device. The cantilever type photovoltaic device comprises a stand column, a power assembly and a photovoltaic panel, one end of the power assembly is fixedly connected with the stand column, and the other end of the power assembly is suspended. The power assembly comprises a center shaft, a transmission nut, a driving part, a transmission sleeve, a spiral spline pair and a limiting part. At least one end of the center shaft is provided with a fixing position. The transmission nut is sleeved on the central shaft; the driving part is used for driving the transmission nut to move along the axis of the central shaft; the transmission sleeve sleeves the peripheral surface of the transmission nut; and the spiral spline pairs are respectively arranged on the outer peripheral surface of the transmission nut and the inner peripheral surface of the transmission sleeve, and / or are respectively arranged on the outer peripheral surface of the central shaft and the inner peripheral surface of the transmission nut. The limiting piece comprises a first chuck and at least one limiting ring, the first chuck is provided with a through hole and arranged at the end, provided with the fixing position, of the center shaft in a sleeving mode through the through hole, one end of the first chuck is connected with the transmission sleeve, and the first chuck and the limiting ring are connected to the fixing position in a matched mode.

Description

Technical Field

[0001] This utility model relates to the field of solar energy, and in particular to a cantilevered photovoltaic device. Background Technology

[0002] Solar energy is receiving increasing attention as a clean energy source. To improve the efficiency of solar energy utilization, using a powertrain to drive photovoltaic tracking of sunlight is a development trend for photovoltaic devices.

[0003] To ensure efficient solar energy utilization and reduce the environmental impact and requirements of photovoltaic (PV) devices on installation sites, our company has proposed a PV device. This device features a fixed connection between the fixed end of the powertrain and a flipping structure, which in turn is fixedly connected to a support column and other components. The main body of the powertrain is suspended in the air, and the photovoltaic panels are connected to the output end of the powertrain. The PV device has a folded state and a tracking state. In the folded state, the flipping structure causes the powertrain and photovoltaic panels to be positioned close to the support column, significantly reducing shading of the ground beneath the PV device. When solar power generation is not needed, or when vegetation shaded by the PV device requires sunlight, the flipping structure is controlled, causing the suspended powertrain to retract. This allows the PV device to coexist harmoniously with vegetation, thereby reducing its environmental impact.

[0004] However, since one end of the powertrain's fixed part is fixedly connected to the column, while the other end is not supported but suspended, this single-sided fixing method places high demands on the structural strength of the powertrain. How to design a photovoltaic tracking device suitable for cantilever structures has become an urgent technical problem to be solved. Utility Model Content

[0005] This invention first proposes a cantilevered photovoltaic device to solve the above-mentioned problems.

[0006] A cantilevered photovoltaic device includes a column, a power assembly, and photovoltaic panels. The power assembly includes a first drive shaft. One end of the first drive shaft is fixedly connected to the column, and the other end is suspended in the air.

[0007] The first drive shaft includes:

[0008] A central shaft, wherein at least one end of the central shaft is provided with a fixed position;

[0009] A transmission nut, which is sleeved on the central shaft;

[0010] A driving component, which drives the transmission nut to move along the axis of the central shaft;

[0011] A transmission sleeve, wherein the transmission sleeve is sleeved on the outer circumferential surface of the transmission nut;

[0012] A helical spline pair is provided on the outer circumferential surface of the transmission nut and the inner circumferential surface of the transmission sleeve, and / or, on the outer circumferential surface of the central shaft and the inner circumferential surface of the transmission nut.

[0013] It also includes a limiting component, which includes a first chuck and at least one limiting ring. The first chuck has a through hole and is sleeved on one end of the central shaft with the fixed position through the through hole. One end of the first chuck is connected to the transmission sleeve, and the first chuck and the limiting ring are connected to the fixed position.

[0014] The first drive shaft is connected to the column via the first chuck, and the photovoltaic panel is connected to the drive sleeve.

[0015] Preferably, the first chuck has an extension cylinder extending toward the central axis, the extension cylinder being sleeved on the central axis, and the axial dimension of the extension cylinder being larger than its own diameter.

[0016] Preferably, the cantilever photovoltaic device includes a straight guide, which is disposed on the outer peripheral surface of the central shaft and also on the inner peripheral surface of the extension tube.

[0017] Preferably, the transmission sleeve is formed by splicing a first sleeve and a second sleeve.

[0018] Preferably, the limiting ring is a semi-ring;

[0019] The through hole is funnel-shaped, and the funnel-shaped hole wall abuts against the limiting ring;

[0020] And / or,

[0021] The diameter of the through hole is larger than the diameter of the central shaft, the limiting ring is wedge-shaped, and the inner wall of the through hole near the end of the limiting ring abuts against the outer surface of the limiting ring.

[0022] Preferably, at least one end of the central shaft has a groove on its circumferential surface, and the groove is a fixed position;

[0023] And / or,

[0024] The circumferential surface of one end of the central shaft is provided with a protrusion, the fixing position is arranged adjacent to the protrusion, and the fixing position and the transmission nut are both located on the same side of the protrusion.

[0025] The limiting ring abuts against the wall surface of the fixed position on the side away from the transmission nut.

[0026] Preferably, it further includes an elastic element for applying a spring force to the limiting element to move along the central axis.

[0027] Preferably, the elastic element is a wave spring.

[0028] Preferably, the elastic element is disposed between the first chuck and the limiting ring, so that the first chuck and the limiting ring tend to move in opposite directions along the axial direction of the central axis;

[0029] And / or,

[0030] The elastic element is disposed between the first chuck and the transmission sleeve, and is used to cause the first chuck to move away from the transmission sleeve along the axial direction of the central axis.

[0031] In some embodiments, the fixed position is only provided at one end of the central shaft, and the other end of the central shaft is provided with a second chuck, an elastic element and a fixing element in sequence, and the elastic element abuts against the transmission sleeve through the second chuck, so as to make the transmission sleeve have a tendency to move in the direction of the first chuck.

[0032] The beneficial effects of this utility model are: it improves structural strength and is stable and reliable while being easy to install.

[0033] 1. The photovoltaic device proposed in this utility model has a fixed position at the end of the central shaft. At the same time, the transmission sleeve is connected to the central shaft through the cooperation between the fixed position and the first chuck and the limiting ring in the limiting component. It also realizes that the transmission sleeve, the central shaft and the first chuck are integrated into a whole. When the photovoltaic device is cantilevered or vibrates due to the movement of the transmission nut along the central shaft, the cooperation between the fixed position and the first chuck and the limiting ring will not fail or loosen, thus ensuring the reliability of the connection between the transmission sleeve and the central shaft. Furthermore, since the limiting component used to connect the central shaft and the transmission sleeve is set to include the first chuck and at least one limiting ring, the assembly of the first transmission shaft is simpler, the assembly efficiency is improved and the assembly cost is reduced.

[0034] 2. When the axial dimension of the extension tube is greater than its own diameter, it can improve the connection strength between the first chuck and the central shaft, thereby making the overall structure of the first drive shaft of the photovoltaic device more stable and reliable.

[0035] 3. The limiting ring is set as a semi-ring, and the entire or part of the limiting ring can be embedded in the through hole of the first chuck for sleeve placement. When the first chuck abuts against the end of the transmission sleeve, the through hole on the first chuck forces the limiting ring to have a tendency to radially contract along the central axis, thereby ensuring the reliability of the fit between the limiting ring and the fixed position. At this time, a first thread can be set at the fixed position, and a second thread that mates with the first thread can be set on the inner circumferential surface of the limiting ring. Through the threaded fit between the limiting ring and the central axis, the magnitude of the holding force between the first chuck and the transmission sleeve can be adjusted, and the threaded fit between the limiting ring and the central axis will not loosen due to the abutment between the limiting ring and the first chuck. Alternatively, a groove can be set on the circumferential surface of at least one end of the central axis as a fixed position, and / or a protrusion can be set on the circumferential surface of one end of the central axis, with the fixed position located adjacent to the protrusion. The semi-ring-shaped limiting ring further improves the assembly speed and enables a detachable fixed connection.

[0036] 4. The first drive shaft proposed in this utility model also includes an elastic element. This elastic element absorbs the potential energy generated by the movement of the drive sleeve and the central shaft along their axial direction due to external forces, further ensuring the reliability of the connection between the drive sleeve and the central shaft. Furthermore, when the first drive shaft is applied to a cantilevered photovoltaic device, the drive sleeve will thermally expand before the central shaft when exposed to sunlight, and will contract before the central shaft at night. That is, the thermal expansion and contraction of the drive sleeve and the central shaft are not synchronized, and the deformation rate of the drive sleeve in the length direction is faster than that of the central shaft. The elastic element allows the connection between the drive sleeve and the central shaft to adapt to this asynchronous thermal expansion, ensuring the motion accuracy and stability of the first drive shaft.

[0037] 5. By utilizing the limiting member proposed in this application in the first drive shaft, especially when it is only set at one end, the contact force between the first chuck and the drive sleeve can be adjusted through the other end. This allows the drive sleeve to stretch the central shaft, preventing the central shaft from bending naturally. When multiple drive sleeves are set to facilitate the setting of an external power source for driving the drive member, an axial compressive force can be applied to multiple drive sleeves through the connection between the central shaft and the drive sleeves. Furthermore, when an elastic member is provided, the elastic coefficient and deformation during use of the elastic member can be adjusted to optimize the interaction force between the drive sleeve and the central shaft and minimize the fluctuation of the interaction force during thermal expansion and contraction. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the central axis of the first transmission shaft in this embodiment.

[0039] Figure 2 for Figure 1 A schematic diagram of its breakdown.

[0040] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0041] Figure 4 for Figure 2 A magnified view of a section at point B in the middle.

[0042] Figure 5 This is a schematic diagram of the tracking status of the cantilever photovoltaic device in this embodiment.

[0043] Figure 6 This is a schematic diagram of the folded state of the cantilever photovoltaic device in this embodiment.

[0044] in:

[0045] 1. Central axis; 11. Fixed position; 12. First positioning part;

[0046] 2. Driving component; 3. Transmission sleeve; 4. Bearing;

[0047] 5. Limiting component; 51. First chuck; 511. Through hole; 512. Second positioning part; 52. Limiting ring; 53. Second chuck; 54. Fixing component;

[0048] 6. Disc spring; 7. Powertrain; 71. First drive shaft; 72. Second drive shaft; 8. Photovoltaic panel; 9. Column. Detailed Implementation

[0049] The present invention will be further described in detail below with reference to the accompanying drawings.

[0050] like Figures 1 to 6 The cantilevered photovoltaic device shown includes a column 9, a power assembly 7, and photovoltaic panels 8. The power assembly 7 includes a first drive shaft 71, one end of which is fixedly connected to the column 9, and the other end is suspended. The first drive shaft 71 includes a central shaft 1, a drive nut, a driving member 2, a drive sleeve 3, a helical spline pair, and a limiting member 5. At least one end of the central shaft 1 is provided with a fixed position 11. The drive nut is sleeved on the central shaft 1. The driving member 2 is used to drive the drive nut to move along the axis of the central shaft 1. The drive sleeve 3 is sleeved on the outer circumferential surface of the drive nut. The helical spline pair is respectively disposed on the outer circumferential surface of the drive nut and the inner circumferential surface of the drive sleeve 3, and / or respectively disposed on the outer circumferential surface of the central shaft 1 and the inner circumferential surface of the drive nut. The limiting component 5 includes a first chuck 51 and at least one limiting ring 52. The first chuck 51 has a through hole 511 and is sleeved on one end of the central shaft 1 with a fixed position 11 through the through hole 511. One end of the first chuck 51 is connected to the transmission sleeve 3, and the first chuck 51 and the limiting ring 52 are connected to the fixed position 11. The first transmission shaft 71 is connected to the column 9 through the first chuck 51, and the photovoltaic panel 8 is connected to the transmission sleeve 3.

[0051] Depending on the location of the helical spline pair, the structure of the first drive shaft 71 can be categorized into two cases. The first case: [Example 1] Figure 5 and Figure 6 As shown, the central shaft 1 is connected to the column 9 (in Figure 5 and Figure 6 In the first case, the central shaft 1 is indirectly connected to the column 9 via the second transmission shaft 72. The photovoltaic panel 8 is fixedly connected to the transmission sleeve 3. The spiral spline pair is located on the outer circumferential surface of the transmission nut and the inner circumferential surface of the transmission sleeve 3. When the driving member 2 drives the transmission nut to move along the central shaft 1, the transmission sleeve 3 rotates around its own axis through the cooperation between the transmission nut, the transmission sleeve 3, and the spiral spline pair, thereby driving the photovoltaic panel 8 to move, thus realizing solar tracking, folding or unfolding of the photovoltaic panel 8, etc. In the second case, the transmission sleeve 3 is connected to the column 9, and the photovoltaic panel 8 is fixedly connected to the central shaft 1. The spiral spline pair is located on the outer circumferential surface of the central shaft 1 and the inner circumferential surface of the transmission nut. When the driving member 2 drives the transmission nut to move along the central shaft 1, the central shaft 1 rotates around its own axis through the cooperation between the transmission nut, the central shaft 1, and the spiral spline pair, thereby driving the photovoltaic panel 8 to move, thus also realizing solar tracking, folding or unfolding of the photovoltaic panel 8, etc.

[0052] It should also be noted that the driving component 2 refers to a component capable of energy conversion, such as converting electrical energy into kinetic energy, thereby driving the transmission nut to move. In this embodiment, the driving component 2 can be a separate motor that directly drives the transmission nut, or it can be a combination of a power source and certain transmission mechanisms, such as a hydraulic push rod driving the transmission nut to move, or it can be an electric push rod, a crank-rocker mechanism, a gear and rack mechanism, or other structures.

[0053] In some embodiments, as shown in Figure 3, the first chuck 51 has an extension cylinder extending toward the central shaft 1. The extension cylinder is sleeved on the central shaft 1, and the axial dimension of the extension cylinder is larger than its own diameter. This arrangement can improve the connection strength between the first chuck 51 and the central shaft 1 and ensure structural stability.

[0054] In some embodiments, the cantilever photovoltaic device includes a straight guide, which is disposed on the outer circumferential surface of the central shaft 1 and also on the inner circumferential surface of the extension cylinder. The straight guide is mainly used to prevent relative rotation between the central shaft 1 and the extension cylinder, thereby improving the stability of their fixed connection by restricting their circumferential movement.

[0055] In some embodiments where the transmission sleeve 3 is too long or other components need to be installed in the middle of the transmission sleeve 3, the transmission sleeve 3 is formed by splicing a first sleeve and a second sleeve. By setting the aforementioned limiting members 5 at both ends of the central shaft 1, the structural strength of the connection between the spliced ​​first sleeve and the second sleeve can be guaranteed. Furthermore, in some embodiments, a connecting flange is also provided between the first sleeve and the second sleeve to further improve the connection strength between the two.

[0056] It should be noted that in this embodiment, at least one end of the central shaft 1 is provided with a fixed position 11. The function of the fixed position 11 is to cooperate with the limiting member 5 to prevent the transmission sleeve 3 from continuing to move linearly relative to the central shaft 1 towards the fixed position 11. Therefore, the specific structure of the fixed position 11 can be a radial protrusion on the circumferential surface of at least one end of the central shaft 1, a radial groove on the circumferential surface of at least one end of the central shaft 1, or a combination of a protrusion and a groove.

[0057] To enable rapid connection of the transmission sleeve 3 to the central shaft 1 via the limiting member 5, in this embodiment, the limiting member 5 includes a first chuck 51 and at least one limiting ring 52. The limiting ring 52 can be a single, integral ring, in which case the fixing position 11 should be a radially protruding part located on the circumferential surface of at least one end of the central shaft 1; or it can be a semi-ring.

[0058] When the limiting ring 52 is a semi-ring, the through hole 511 in the first chuck 51 can be adopted in at least the following ways:

[0059] In one embodiment of this invention, the through hole 511 in the first chuck 51, which is fitted onto the central shaft 1, is funnel-shaped. It should be noted that the funnel shape of the through hole 511 can mean that all the holes in the through hole 511 have unequal diameters, or it can be a combination of holes with partially equal diameters and partially unequal diameters. When the first chuck 51, the limiting ring 52, and the fixed position 11 are engaged, the walls of the through holes 511 with unequal diameters abut against the limiting ring 52, causing the limiting ring 52 to tend to move radially toward the fixed position 11 along the central shaft 1.

[0060] In the second embodiment, another implementation of this invention, the diameter of the through hole 511 in the first chuck 51, which is fitted onto the central shaft 1, is larger than the diameter of the central shaft 1. The limiting ring 52 is wedge-shaped, and the inner wall of the through hole 511 near the limiting ring 52 abuts against the outer surface of the limiting ring 52. The through hole 511 in the first chuck 51, which is fitted onto the central shaft 1, has a diameter larger than the diameter of the central shaft 1. This can be achieved by the entire through hole 511 having a diameter larger than the diameter of the central shaft 1, or by a portion of the through hole 511 having a diameter larger than the diameter of the central shaft 1, for example, by the through hole 511 being countersunk. The limiting ring 52 is accommodated using the gap between the through hole 511 and the central shaft 1, allowing the wall of the through hole 511 to abut against the limiting ring 52, thereby causing the limiting ring 52 to tend to move radially towards the fixed position 11 along the central shaft 1.

[0061] It should be noted that the above two implementation methods can be implemented individually or in combination.

[0062] Furthermore, in this embodiment, when the limiting ring 52 is a semi-ring, in order to adjust the holding force of the limiting member 5 on the transmission sleeve 3, a first thread can be provided at the fixed position 11. At the same time, a second thread that cooperates with the first thread is provided on the inner circumferential surface of the limiting ring 52. Through the cooperation of the second thread and the first thread, the relative position of the limiting ring 52 and the central shaft 1 can be adjusted, thereby adjusting the holding force of the limiting member 5 on the transmission sleeve 3.

[0063] It should be understood that, since the central shaft 1 and the transmission sleeve 3 rotate relative to each other and are connected by the limiting member 5, at least one of them should be able to rotate relative to the first chuck 51. To make the relative rotation between the first chuck 51 and the transmission sleeve 3 smoother, or to make the relative rotation between the first chuck 51 and the central shaft 1 smoother, a bearing 4 or ball bearing can be provided between the first chuck 51 and the transmission sleeve 3 and / or the central shaft 1. In this embodiment, to reduce costs, the bearing 4 is only provided between the first chuck 51 and the transmission sleeve 3. In this case, to reduce the possibility of the first chuck 51 rotating relative to the central shaft 1 and thus reduce frictional loss, and to achieve the goal of quickly and optimally mounting the first chuck 51 onto the central shaft 1. The outer circumferential surface of the central shaft 1 is provided with a first positioning part 12, and the inner circumferential surface of the first chuck 51 is provided with a second positioning part 512 that cooperates with the first positioning part 12. With the cooperation of the first positioning part 12 and the second positioning part 512, the first chuck 51 cannot rotate around the axis of the central shaft 1.

[0064] Furthermore, to eliminate the possibility of asynchronous thermal expansion and contraction between the inner central shaft 1 and the transmission sleeve 3 during application of the first transmission shaft 71, the first transmission shaft 71 proposed in this embodiment also includes an elastic element. The elastic element is used to apply a spring force to the limiting member 5 along the central shaft 1. That is, by utilizing the deformation of the elastic element, when the transmission sleeve 3 expands before the inner central shaft 1, the deformation of the transmission sleeve 3 is absorbed without damaging the limiting member 5. Also, when the transmission sleeve 3 contracts before the inner central shaft 1, the holding force between the transmission sleeve 3 and the limiting member 5 is ensured in a timely manner, ensuring the reliability of the connection between the central shaft 1 and the transmission sleeve 3 through the limiting member 5.

[0065] Depending on the different structures of the limiting ring 52, the first chuck 51, and the fixed position 11, the elastic element can be positioned in different locations. The possible positions for the elastic element include, but are not limited to, the following:

[0066] The first method involves placing an elastic element between the first chuck 51 and the limiting ring 52 to give the first chuck 51 and the limiting ring 52 a tendency to move back and forth along the axial direction of the central axis 1.

[0067] The second method involves placing an elastic element between the first chuck 51 and the transmission sleeve 3 to induce the first chuck 51 to move away from the transmission sleeve 3 along the axial direction of the central shaft 1.

[0068] The third method involves placing an elastic element between the limiting ring 52 and the fixed position 11 to encourage the limiting element 5 to move along the axis of the central shaft 1 towards the transmission nut.

[0069] It should be noted that the aforementioned elastic elements can be installed individually or in combination.

[0070] It should be noted that, in the absence of an elastic element, in some embodiments, only one end of the central shaft 1 and the transmission sleeve 3 are connected via the limiting element 5 proposed in this embodiment. However, when an elastic element is provided, either only one end of the central shaft 1 and the transmission sleeve 3 can be connected via the limiting element 5 proposed in this embodiment, or both ends of the central shaft 1 and the transmission sleeve 3 can be connected via the limiting element 5 proposed in this embodiment.

[0071] In this embodiment, as shown in the figure, the fixed position 11 is only provided at one end of the central shaft 1, and the other end of the central shaft 1 is provided with a second chuck 53, an elastic element and a fixed element 54 in sequence. The elastic element abuts against the transmission sleeve 3 through the second chuck 53, so that the transmission sleeve 3 has a tendency to move in the direction of the first chuck 51.

[0072] When both ends of the central shaft 1 and the transmission sleeve 3 are connected by the limiting member 5 proposed in this embodiment, it is only necessary to set an elastic member at the first assembled end. By utilizing the deformation of the elastic member, the transmission sleeve 3 can be moved towards the first assembled end by external force, so that the limiting member 5 at the other end can be assembled.

[0073] It should also be noted that, in this embodiment, the elastic element refers to a component that can deform when subjected to external force and return to its state before the external force is applied when the external force is removed. This includes, but is not limited to, springs, elastic rubber blocks, or rings. In this embodiment, the elastic element is preferably a disc spring 6, which can be a single disc spring 6 or a spring group composed of multiple disc springs 6 as shown in the figure. The disc spring 6 can be conveniently fitted onto the central shaft 1, improving the efficiency of assembling the cantilever photovoltaic device proposed in this embodiment. Furthermore, the disc spring 6 also has advantages such as high load capacity, space saving, good buffering and shock absorption performance, flexible combination use, high reliability, and long lifespan.

[0074] like Figure 5 and Figure 6 As shown in one embodiment of a cantilevered photovoltaic device, the powertrain 7 further includes a second drive shaft 72, which includes a fixed end and an output end. The second drive shaft 72 is fixedly connected to the column 9 through the fixed end, and the first drive shaft 71 is fixedly connected to the output end through the first chuck 51.

[0075] When the cantilever photovoltaic device is stationary or performing solar tracking and is affected by external factors such as wind, the photovoltaic panel 8 will sway. The setting of the limiting component 5 can make the overall structure of the powertrain 7 more stable, thereby further improving the stability of the cantilever photovoltaic device when tracking power generation or folding to avoid danger.

[0076] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0077] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0078] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "provided with" and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0079] The above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the present utility model patent should be included in the scope of the present utility model.

Claims

1. A cantilevered photovoltaic device, characterized in that: The system includes a column, a powertrain, and photovoltaic panels. The powertrain includes a first drive shaft. One end of the first drive shaft is fixedly connected to the column, and the other end is suspended in the air. The first drive shaft includes: A central shaft, wherein at least one end of the central shaft is provided with a fixed position; A transmission nut, which is sleeved on the central shaft; A driving component, which drives the transmission nut to move along the axis of the central shaft; A transmission sleeve, wherein the transmission sleeve is sleeved on the outer circumferential surface of the transmission nut; A helical spline pair is provided on the outer circumferential surface of the transmission nut and the inner circumferential surface of the transmission sleeve, and / or, on the outer circumferential surface of the central shaft and the inner circumferential surface of the transmission nut. It also includes a limiting component, which includes a first chuck and at least one limiting ring. The first chuck has a through hole and is sleeved on one end of the central shaft with the fixed position through the through hole. One end of the first chuck is connected to the transmission sleeve, and the first chuck and the limiting ring are connected to the fixed position. The first drive shaft is connected to the column via the first chuck, and the photovoltaic panel is connected to the drive sleeve.

2. The cantilever photovoltaic device as described in claim 1, characterized in that: The first chuck has an extension cylinder extending toward the central axis, the extension cylinder being sleeved on the central axis, and the axial length of the extension cylinder being greater than its inner diameter.

3. The cantilever photovoltaic device as described in claim 2, characterized in that: The cantilevered photovoltaic device includes a straight guide, which is disposed on the outer peripheral surface of the central shaft and also on the inner peripheral surface of the extension cylinder.

4. The cantilever photovoltaic device as described in claim 1, characterized in that: The transmission sleeve is formed by splicing a first sleeve and a second sleeve.

5. The cantilever photovoltaic device as described in claim 1, characterized in that: The limiting ring is a semi-ring; the through hole is funnel-shaped, and the funnel-shaped hole wall abuts against the limiting ring; And / or, The diameter of the through hole is larger than the diameter of the central shaft, the limiting ring is wedge-shaped, and the inner wall of the through hole near the end of the limiting ring abuts against the outer surface of the limiting ring.

6. The cantilever photovoltaic device as described in claim 5, characterized in that: The circumferential surface of at least one end of the central shaft is provided with a groove, and the groove is a fixed position; And / or, The circumferential surface of one end of the central shaft is provided with a protrusion, the fixing position is arranged adjacent to the protrusion, and the fixing position and the transmission nut are both located on the same side of the protrusion. The limiting ring abuts against the wall surface of the fixed position on the side away from the transmission nut.

7. The cantilever photovoltaic device as described in claim 1, characterized in that: It also includes an elastic element for applying a spring force to the limiting element to move along the central axis.

8. The cantilever photovoltaic device as described in claim 7, characterized in that: The elastic element is a wave spring.

9. The cantilever photovoltaic device as described in claim 7, characterized in that: The elastic element is disposed between the first chuck and the limiting ring, and is used to make the first chuck and the limiting ring tend to move in opposite directions along the axial direction of the central axis; And / or, The elastic element is disposed between the first chuck and the transmission sleeve, and is used to cause the first chuck to move away from the transmission sleeve along the axial direction of the central axis.

10. The cantilever photovoltaic device as described in claim 7, characterized in that: The fixed position is only provided at one end of the central shaft, and the other end of the central shaft is provided with a second chuck, an elastic element and a fixing element in sequence. The elastic element abuts against the transmission sleeve through the second chuck, so as to make the transmission sleeve have a tendency to move in the direction of the first chuck.

11. The cantilever photovoltaic device according to any one of claims 1-10, characterized in that: The powertrain also includes a second drive shaft, which has a fixed end and an output end. The second drive shaft is fixedly connected to the column through the fixed end, and the first drive shaft is fixedly connected to the output end through the first chuck.

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