Main shaft connecting piece for multi-point transmission of photovoltaic support

Abstract

The utility model provides a main shaft connecting piece for multi-point transmission of a photovoltaic support, which is used for connecting two main shafts and comprises an upper hoop and a lower hoop, each of the upper hoop and the lower hoop comprises a hoop main body matched with the outline of the main shaft and mounting wing plates arranged on two sides of the hoop main body, the two mounting wing plates are formed by extending the two sides of the hoop body outwards, and an included angle a is formed between each mounting wing plate and the horizontal plane to reserve a mounting wing plate deformation space, so that it is guaranteed that the mounting wing plates are deformed into the horizontal state in the locked state. The cross section of the main shaft is optimized to be a regular octagon (the opposite side distance is D), the upper hoop and the lower hoop are close to half octagons in shape and are divided into hoop bodies and mounting wing plates, the hoop bodies are obtained by prolonging the length of bevel edges on the basis of the half regular octagons, and therefore a four-slope synchronous meshing structure is formed.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic bracket technology, specifically to a spindle connector for multi-point transmission of photovoltaic brackets. Background Technology

[0002] As photovoltaic tracking brackets develop towards larger spans and higher precision, the mechanical performance of the main shaft connectors has become a core factor affecting system reliability. In existing technologies, multi-point transmission systems commonly employ a U-shaped clamp structure, using double-sided bolts for locking the main shaft connection. However, this design suffers from the following technical bottlenecks: First, insufficient contact surface leads to deteriorated torsional resistance. Traditional clamps, limited by installation methods, require a lateral installation gap (typically 0.5-3mm) between the main shaft and the connector, resulting in contact only on the top and bottom surfaces. The horizontal direction lacks effective constraint due to the gap. This non-full-circumferential contact mode reduces torque transmission efficiency and easily causes circumferential slippage of the main shaft under dynamic wind load conditions, leading to synchronization deviations in the photovoltaic module array. Second, structural instability is caused by bolt preload decay. To achieve bolt locking, deformation compensation space needs to be reserved between the clamp flanges. However, the plastic deformation of the flanges during bolt tightening (measured deformation reaches 2-4°) causes nonlinear decay of the preload, significantly reducing the bending stiffness of the connection node. The aforementioned defects directly limit the service performance of tracking brackets under complex working conditions. For example, in mountainous photovoltaic projects, the non-uniform torque distribution caused by undulating terrain will exacerbate the stress concentration phenomenon in traditional clamp connections, leading to zinc layer damage and accelerated corrosion.

[0003] In view of this, the person in charge of the utility model in this case conducted in-depth research on the above-mentioned issues, which led to the creation of this case. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned shortcomings by providing a spindle connector for multi-point transmission of photovoltaic brackets that can effectively ensure the coaxiality of the two spindles and has good connection stability.

[0005] The solution adopted by this utility model to solve the technical problem is: a main shaft connector for multi-point transmission of photovoltaic brackets, used to connect two main shafts, including an upper clamp and a lower clamp. The upper clamp and the lower clamp each include a clamp body adapted to the contour of the main shaft and mounting wing plates provided on both sides of the clamp body. The two mounting wing plates are formed by extending outward from both sides of the clamp body. An angle α is formed between the mounting wing plates and the horizontal plane to reserve space for deformation of the mounting wing plates, thereby ensuring that the mounting wing plates deform into a horizontal state under the locked state.

[0006] Furthermore, in order to form a preload angle and increase the bolt preload, the included angle α is 1°-5°.

[0007] Furthermore, in order to ensure that the clamp body is compatible with the contour of the octagonal tube spindle, the spindle is an octagonal tube spindle, the clamp body includes a planar section, an inclined section extending from both ends of the planar section, and a side plane extending vertically from the inclined section, and the mounting wing plate extends outward from the side plane.

[0008] Furthermore, in order to tightly connect the two octagonal tube spindles using upper and lower clamps, the inclined sections of the upper and lower clamps are fully fitted with the inclined surfaces of the spindles to ensure the coaxiality of the two spindles. The distance between the flat sections of the upper and lower clamps is greater than the diameter of the spindles to prevent over-constraint installation of the octagonal tube spindles.

[0009] Furthermore, in order to connect the upper clamp and the lower clamp, the upper clamp and the lower clamp are fixedly installed on the main shaft by long bolts and nuts, and the two ends of the upper clamp are fixedly connected to the two ends of the lower clamp by bolts and nuts to clamp tightly on the main shaft. The clamp body is provided with a number of first bolt holes for long bolts to pass through, and the mounting wing plate is provided with a number of second bolt holes for bolts to pass through.

[0010] Furthermore, in order to install long bolts, the first bolt hole is either a round hole or a strip hole extending along the length of the upper or lower clamp.

[0011] Furthermore, for the purpose of installing bolts, the second bolt hole is a strip hole or a round hole extending perpendicular to the length direction of the upper or lower clamp.

[0012] Furthermore, the upper and lower clamps are formed by bending or stamping.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] (1) This utility model optimizes the spindle cross-section into a regular octagon (with a side-to-side distance of D). Compared to a square tube spindle, the cross-section of the spindle is closer to a circle, resulting in higher torsional strength with the same amount of material. The inclined side of the clamp body is extended by ΔL = 3mm (ΔL = 0.02D). The upper and lower clamps are close to half an octagon, consisting of a clamp body and mounting wing plates. The clamp body is obtained by extending the inclined side of a half regular octagon, thus forming a four-inclined synchronous meshing structure. This configuration increases the number of contact surfaces from two opposite sides in the traditional structure to four parallel sides, increasing the number of contact surfaces from 2 to 4, thereby significantly improving the spindle connector. The contact area with the spindle effectively improves the torque transmission efficiency and synchronization accuracy of the spindle, reduces angular deviation, and the four-way contact mode can also effectively suppress circumferential slippage and reduce the synchronization deviation of the spindle. The clamp body has four slots for long bolts to pass through two spindle connectors and the spindle at the same time, so that the spindle connectors and the spindle have a tight four-way contact and fit. The longitudinal slots facilitate the adjustment of the spindle position. The mounting wing plate has eight round holes for bolt locking, or the mounting wing plate has transverse slots so that the bolts can still be easily installed even at the preset angle. The preset angle of the mounting wing plate can accurately spring back to the horizontal state after the bolts are locked, reducing the preload attenuation rate.

[0015] (2) In the existing spindle connector, the plastic deformation of the flange during bolt tightening (measured deformation of 2-4°) will cause nonlinear decay of the preload, significantly reducing the bending stiffness of the connection node. In order to ensure bolt locking, this utility model reserves deformation compensation space for the flange and sets the mounting flange to a warped state. Under the condition that the material is Q355b and the bolt specification is M16, the plastic deformation angle of the flange is measured to be 2.5°-3.5°. After the bolt is locked, the flange can be deformed to a horizontal state. The initial warping angle of the flange is optimized to θ = 2.8° through finite element simulation. In the subsequent node strength test, the bending stiffness of the spindle connector is significantly improved compared with the traditional structure. After effect verification, the flatness error of the flange after bolt locking is <1° (measured by a level), thus effectively avoiding the loss of preload due to deformation, effectively reducing the decay rate of bolt preload, and enhancing the bending stiffness of the node.

[0016] (3) This utility model can adopt a multi-station continuous stamping composite forming process or bending process to realize the seamless integral forming of the connecting parts, simplify the process, reduce the process complexity, improve production efficiency, improve the strength of finished products and material utilization rate, and improve the mechanical properties of the spindle connecting parts. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0019] Figure 2 This is a front view of the structure of Embodiment 1 of this utility model;

[0020] Figure 3 This is an installation structure diagram of Embodiment 1 of this utility model.

[0021] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of this utility model;

[0022] In the diagram: 1. Main shaft; 2. Upper clamp; 3. Lower clamp; 4. Long bolt; 5. Bolt; 6. Clamp body; 61. First bolt hole; 62. Planar section; 63. Inclined section; 64. Side plane; 7. Mounting wing plate; 71. Second bolt hole. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0024] Example 1:

[0025] like Figure 1-3 As shown, this embodiment provides a main shaft connector for multi-point transmission of photovoltaic brackets, used to connect two main shafts 1. It includes an upper clamp 2 and a lower clamp 3 formed by stamping. The upper clamp 2 and the lower clamp 3 each include a clamp body 6 adapted to the contour of the main shaft 1 and mounting wing plates 7 provided on both sides of the clamp body 6. The two mounting wing plates 7 are formed by extending outward from both sides of the clamp body 6. The mounting wing plates 7 form an angle α with the horizontal plane to reserve space for deformation of the mounting wing plates 7, thereby ensuring that the mounting wing plates 7 deform into a horizontal state under the locked state.

[0026] In this embodiment, the included angle α is 1°-5°, preferably 2.5°-3.5°.

[0027] In this embodiment, the main shaft 1 is an octagonal tube main shaft 1, the clamp body 6 includes a planar section 62, an inclined section 63 extending obliquely from both ends of the planar section 62, and a side plane 64 extending vertically from the inclined section 63, and the mounting wing plate 7 extends outward from the side plane 64.

[0028] In this embodiment, the inclined sections 63 of the upper clamp 2 and the lower clamp 3 are fully fitted with the inclined surface of the main shaft 1 to ensure the coaxiality of the two main shafts 1. The distance between the flat section 62 of the upper clamp 2 and the flat section 62 of the lower clamp 3 is greater than the diameter of the main shaft 1 to prevent over-constraint installation of the octagonal tube main shaft 1.

[0029] In this embodiment, the upper clamp 2 and the lower clamp 3 are fixedly installed on the main shaft 1 by long bolts 54 and nuts, and the two ends of the upper clamp 2 are fixedly connected to the two ends of the lower clamp 3 by bolts 5 and nuts, thus clamping and installing on the main shaft 1. The clamp body 6 is provided with a plurality of first bolt holes 61 for passing through the long bolts 54, and the mounting wing plate 7 is provided with a plurality of second bolt holes 71 for passing through the bolts 5.

[0030] In this embodiment, the first bolt hole 61 is a round hole or a strip hole extending along the length direction of the upper clamp 2 or the lower clamp 3, and the second bolt hole 71 is a strip hole or a round hole extending perpendicular to the length direction of the upper clamp 2 or the lower clamp 3.

[0031] Example 2:

[0032] like Figure 4 As shown, this embodiment provides a main shaft 1 connector for multi-point transmission of photovoltaic brackets. The difference between this embodiment and embodiment one is that the upper clamp 2 and the lower clamp 3 are formed by bending and no included angle α is provided.

[0033] In this embodiment, the first bolt hole 61 is a round hole or a strip hole extending along the length direction of the upper clamp 2 or the lower clamp 3, and the second bolt hole 71 is a strip hole or a round hole extending perpendicular to the length direction of the upper clamp 2 or the lower clamp 3.

[0034] This invention optimizes the cross-section of the main shaft 1 into a regular octagon (with a side-to-side distance of D). Compared to the square tube main shaft 1, the cross-section of the main shaft 1 is closer to a circle, resulting in higher torsional strength with the same amount of material. The inclined side of the clamp body 6 is extended by ΔL = 3mm (ΔL = 0.02D). The upper clamp 2 and lower clamp 3 are nearly half an octagon, consisting of the clamp body 6 and the mounting wing plate 7. The clamp body 6 is obtained by extending the inclined side of the half regular octagon, thus forming a four-inclined-surface synchronous meshing structure. This configuration increases the number of contact surfaces from two opposite sides in the traditional structure to four pairs of parallel surfaces, increasing the number of contact surfaces from 2 to 4, thereby significantly improving the contact between the main shaft 1 connector and the main shaft 1. The area effectively improves the torque transmission efficiency and synchronization accuracy of the spindle 1, reduces angular deviation, and the four-way surface contact mode can also effectively suppress circumferential slippage and reduce the synchronization deviation of the spindle 1. The clamp body 6 has 4 slots for the long bolts 54 to pass through the two spindle 1 connectors and the spindle 1 at the same time, so that the spindle 1 connectors and the spindle 1 are in close contact in four directions. The longitudinal slots facilitate the adjustment of the spindle 1 position. The mounting wing plate 7 has 8 round holes for the bolts 5 to lock, or the mounting wing plate 7 has transverse slots so that the bolts 5 can still be easily passed through the mounting wing plate 7 at the preset angle. The preset angle of the mounting wing plate 7 can accurately spring back to the horizontal state after the bolts 5 are locked, reducing the preload attenuation rate.

[0035] In the existing spindle 1 connector, the plastic deformation of the flange during the tightening of bolt 5 (measured deformation reaches 2-4°) causes nonlinear attenuation of the preload, significantly reducing the bending stiffness of the connection node. To ensure bolt 5 is locked, this invention provides deformation compensation space for the flange by setting the mounting flange 7 in a warped state. Under conditions where the material is Q355b and bolt 5 is M16, the measured plastic deformation angle of the flange is 2.5°-3.5°. After bolt 5 is locked, the flange can deform to a horizontal state. Finite element simulation was used to optimize the initial warping angle θ = 2.8°. In subsequent node strength tests, the bending stiffness of the spindle 1 connector is significantly improved compared to traditional structures. Verification shows that the flatness error of the flange after bolt 5 is locked is <1° (measured with a level), effectively avoiding preload loss due to deformation, effectively reducing the attenuation rate of bolt 5 preload, and enhancing the bending stiffness of the node.

[0036] This utility model can adopt a multi-station continuous stamping composite forming process or a bending process to achieve seamless integral forming of the connector, simplifying the process, reducing process complexity, improving production efficiency, increasing the strength of the finished product and the material utilization rate, and improving the mechanical properties of the main shaft 1 connector.

[0037] The above description is merely an embodiment of this utility model and does not limit the scope of patent protection of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this utility model.

Claims

1. A spindle connector for multi-point transmission in photovoltaic brackets, used to connect two spindles, characterized in that: It includes an upper clamp and a lower clamp. Both the upper clamp and the lower clamp include a clamp body adapted to the profile of the main shaft and mounting wing plates on both sides of the clamp body. The two mounting wing plates extend outward from both sides of the clamp body. The mounting wing plates form an angle α with the horizontal plane to reserve space for deformation of the mounting wing plates, thereby ensuring that the mounting wing plates deform into a horizontal state under the locked state.

2. The spindle connector for multi-point transmission of photovoltaic brackets according to claim 1, characterized in that: The included angle α is 1°-5°.

3. The spindle connector for multi-point transmission of photovoltaic brackets according to claim 1, characterized in that: The main shaft is an octagonal tube main shaft, and the clamp body includes a planar section, an inclined section extending from both ends of the planar section, and a side plane extending vertically from the inclined section. The mounting wing plate extends outward from the side plane.

4. The spindle connector for multi-point transmission of photovoltaic brackets according to claim 3, characterized in that: The inclined sections of the upper and lower clamps are fully fitted to the inclined surface of the spindle to ensure the coaxiality of the two spindles. The distance between the flat sections of the upper and lower clamps is greater than the diameter of the spindle to prevent over-constraint installation of the octagonal tube spindle.

5. The spindle connector for multi-point transmission of photovoltaic brackets according to claim 1, characterized in that: The upper clamp and the lower clamp are fixedly installed on the main shaft by long bolts and nuts, and the two ends of the upper clamp are fixedly connected to the two ends of the lower clamp by bolts and nuts to clamp tightly on the main shaft. The clamp body is provided with a number of first bolt holes for long bolts to pass through, and the mounting wing plate is provided with a number of second bolt holes for bolts to pass through.

6. The spindle connector for multi-point transmission of photovoltaic brackets according to claim 5, characterized in that: The first bolt hole is a round hole or a strip hole extending along the length of the upper or lower clamp.

7. The spindle connector for multi-point transmission of photovoltaic brackets according to claim 5, characterized in that: The second bolt hole is a strip hole or a round hole extending perpendicular to the length of the upper or lower clamp.

8. The spindle connector for multi-point transmission of photovoltaic brackets according to claim 1, characterized in that: The upper and lower clamps are formed by bending or stamping.

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