Octagonal tube main shaft connecting piece for multi-point transmission of photovoltaic support

Abstract

The invention provides an octagonal tube spindle connecting piece for multi-point transmission of a photovoltaic support, which is used for connecting two octagonal tube spindles and comprises an upper hoop and a lower hoop which are fixedly mounted on the octagonal tube spindles through long bolts and nuts. The two ends of the upper hoop are fixedly connected with the two ends of the lower hoop through bolts and nuts so that the upper hoop can be installed on the octagonal pipe main shaft in an enclasping mode. The 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-bevel synchronous meshing structure is formed.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic supports, and in particular to an octagonal tube main shaft connector for multi-point transmission of a photovoltaic support. Background Art

[0002] As photovoltaic tracking brackets develop towards larger spans and higher precision, the mechanical performance of the clamp has become a key factor affecting system reliability. In existing technologies, multi-point transmission systems generally use a "F"-shaped clamp structure, with the main shaft connected via double-sided bolt locking. However, this design has the following technical bottlenecks: First, insufficient contact surface leads to degraded torsional performance. Conventional clamps are limited by their installation method, requiring a left-right installation gap (typically 0.5-3mm) between the main shaft and the clamp. This results in only top-to-bottom contact, and the gap prevents effective horizontal constraint. This non-full-circumferential contact mode reduces torque transmission efficiency and can easily cause circumferential slippage of the main shaft under dynamic wind load conditions, leading to synchronization deviations in the photovoltaic array. Second, structural instability caused by the decay of the bolt preload. To achieve bolt locking, deformation compensation space must be reserved between the clamp flanges. However, the plastic deformation of the flanges during bolt tightening (measured deformation of 2-4°) causes nonlinear decay of the preload, significantly reducing the bending stiffness of the connection node. These defects directly restrict the performance of tracking brackets under complex operating conditions. For example, in mountainous photovoltaic projects, the uneven torque distribution caused by the undulating terrain can exacerbate stress concentration in traditional clamp connections, leading to zinc layer damage and accelerated corrosion.

[0003] In view of this, the inventors of this case conducted in-depth research on the above-mentioned issues, which led to the creation of this case. Summary of the Invention

[0004] The purpose of the present invention is to address the above shortcomings and provide an octagonal tube main shaft connector for multi-point transmission of photovoltaic brackets, which can effectively ensure the coaxiality of the two main shafts and has good connection stability.

[0005] The solution adopted by the present invention to solve the technical problem is: an octagonal tube main shaft connector for multi-point transmission of a photovoltaic bracket, which is used to connect two octagonal tube main shafts, including an upper clamp and a lower clamp. The upper clamp and the lower clamp both include a clamp body adapted to the main shaft contour and mounting wing plates arranged on both sides of the clamp body. The two mounting wing plates are formed by extending outward from both sides of the clamp body.

[0006] Furthermore, in order to increase the bolt preload, an angle a is formed between the mounting wing and the horizontal plane to reserve deformation space for the mounting wing so as to ensure that the mounting wing is deformed to a horizontal state in the locked state, and the angle a is 1°-5°.

[0007] Furthermore, in order to ensure that the clamp body is adapted to the main axis contour of the octagonal tube, the clamp body includes a plane section, an inclined section extending obliquely from both ends of the plane section, and a side plane extending vertically from the inclined section, and the mounting wing is formed by extending outward from the side plane.

[0008] Furthermore, in order to tightly connect the two octagonal tube main shafts through the upper clamp and the lower clamp; the inclined sections of the upper clamp and the lower clamp are installed in a fit with the inclined surfaces of the octagonal tube main shaft to ensure the coaxiality of the two octagonal tube main shafts, and the distance between the flat section of the upper clamp and the flat section of the lower clamp is greater than the diameter of the octagonal tube main shaft to prevent over-constraint installation of the octagonal tube main shaft.

[0009] Furthermore, in order to ensure that the inclined surface of the clamp body fits with the inclined surface of the octagonal tube main axis; the opposite side distance of the octagonal tube main axis is D, the length of the inclined side of the octagonal tube main axis is L1, the length of the inclined surface section of the clamp body is L2, and the difference between the length of the inclined side of the octagonal tube main axis and the length of the inclined surface section of the clamp body is L2-L1=0.02D.

[0010] Furthermore, in order to connect the upper clamp and the lower clamp, the upper clamp and the lower clamp are fixedly mounted on the octagonal tube 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 so as to be tightly mounted on the octagonal tube main shaft. A plurality of first bolt holes for passing the long bolts are provided on the clamp body, and a plurality of second bolt holes for passing the bolts are provided on the mounting wing plate.

[0011] Furthermore, in order to install long bolts and bolts; the first bolt hole is a round hole or a strip hole extending along the length direction of the upper clamp and the lower clamp, and the second bolt hole is a strip hole or a round hole extending perpendicular to the length direction of the upper clamp or the lower clamp.

[0012] Furthermore, in order to form the upper clamp and the lower clamp, the upper clamp and the lower clamp are formed by bending or stamping.

[0013] Furthermore, in order to form the upper clamp and the lower clamp, the upper clamp and the lower clamp are formed by casting.

[0014] Furthermore, in order to improve the structural strength of the upper and lower clamps, the upper and lower clamps are provided with a number of long reinforcing ribs covering the clamp body and the mounting wing plate and a number of short reinforcing ribs located at the connection between the clamp body and the mounting wing plate, and the short reinforcing ribs are provided between two adjacent long reinforcing ribs.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] (1) The present invention optimizes the cross section of the main shaft to a regular octagon (with a distance from the opposite sides of D). The cross section of the octagonal tube main shaft is closer to a circle than that of the square tube main shaft. With the same amount of material, it has higher torsional strength. The bevel edge of the inner cavity of the clamp is extended by ΔL=3mm (ΔL=0.02D). The upper and lower clamps are close to half an octagon in shape and are divided into a clamp body and a mounting wing plate. The clamp body is obtained by extending the bevel edge length on the basis of half a regular octagon, thereby forming a four-bevel synchronous meshing structure. This configuration increases the contact surface from the two opposite surfaces of the traditional structure to four parallel surfaces in pairs, and the number of contact surfaces is increased from 2 to 4, thereby significantly improving the The contact area between the clamp and the spindle effectively improves the torque transmission efficiency and synchronization accuracy of the spindle and reduces the angular deviation. The four-way surface contact mode can also effectively suppress circumferential slip and reduce the synchronization deviation of the spindle. Four strip holes are opened on the clamp body for long bolts to pass through the two clamps and the spindle at the same time, so that the clamp and the spindle are in close contact in four directions. The longitudinal strip holes facilitate the adjustment of the spindle position. Eight circular holes are opened on the mounting wing for bolt locking, or horizontal strip holes are opened on the mounting wing so that the bolts can still be easily penetrated and installed at the preset angle of the mounting wing. The preset angle of the mounting wing can accurately rebound to the horizontal state after the bolts are tightened, reducing the preload force attenuation rate.

[0017] (2) In the existing clamp, the plastic deformation of the wing plate during the tightening of the bolts (the measured deformation is 2-4°) will cause nonlinear attenuation of the preload force, significantly reducing the bending stiffness of the connection node. In order to ensure the locking of the bolts, the present invention reserves deformation compensation space for the wing plate, and sets the installed wing plate to a warped state. When the material is Q355b and the bolt specification is M16, the plastic deformation angle of the wing plate is measured to be 2.5°-3.5°. After the bolts are locked, the wing plate can be deformed to a horizontal state. The initial warping angle of the wing plate is optimized by finite element simulation to θ=2.8°. In the subsequent node strength test, the bending stiffness of the clamp is significantly improved compared with the traditional structure. After the effect is verified, the flatness error of the wing plate after the bolts are locked is <1° (measured by a spirit level), thereby effectively avoiding the loss of preload force caused by deformation, effectively reducing the attenuation rate of the bolt preload force, and enhancing the bending stiffness of the node part;

[0018] (3) The present invention can adopt an integrated casting process to realize the integrated molding of the clamp without welds, simplify the process, reduce the process complexity, improve the production efficiency, improve the strength of the finished product and the material utilization rate, improve the mechanical properties of the clamp, and pre-set three large reinforcing ribs that penetrate the clamp part and the wing part between the upper surface of the clamp and the wing plate, as well as four small reinforcing ribs (rib height h = 4 mm, rib thickness t = 5 mm) connecting the installation wing plate and the inclined surface of the clamp, and optimize the layout of the reinforcing ribs through finite element simulation;

[0019] (4) The present invention can adopt a multi-station continuous stamping composite forming process or a bending process to achieve weld-free one-piece forming of the clamp, simplify the process, reduce the process complexity, improve production efficiency, improve the strength of the finished product and the material utilization rate, and improve the mechanical properties of the clamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings in conjunction with the embodiments:

[0021] Figure 1 This is a schematic structural diagram of Embodiment 1 of the present invention;

[0022] Figure 2 This is an installation structure diagram of the first embodiment of the present invention;

[0023] Figure 3 This is a structural front view of embodiment 1 of the present invention;

[0024] Figure 4 This is a structural diagram of embodiment 2 of the present invention;

[0025] Figure 5 This is a schematic structural diagram of embodiment 3 of the present invention;

[0026] Figure 6 This is a structural front view of embodiment 3 of the present invention;

[0027] Figure 7 This is the installation structure diagram of embodiment 3 of the present invention.

[0028] In the figure: octagonal tube main shaft 1; upper clamp 2; lower clamp 3; long bolt 4; bolt 5; clamp body 6; first bolt hole 61; plane section 62; inclined section 63; side plane 64; mounting wing plate 7; second bolt hole 71; long reinforcing rib 8; short reinforcing rib 9. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments:

[0030] Example 1:

[0031] like Figure 1-3 As shown, this embodiment provides an octagonal tube main shaft connector for multi-point transmission of a photovoltaic bracket, which is used to connect two octagonal tube main shafts 1, including an upper clamp 2 and a lower clamp 3. The upper clamp 2 and the lower clamp 3 both include a clamp body 6 adapted to the main shaft contour and mounting wing plates 7 arranged 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.

[0032] In this embodiment, in order to ensure that the clamp body 6 is adapted to the contour of the octagonal tube main shaft 1, the clamp body 6 includes a plane section 62, an inclined section 63 extending at a 45-degree angle from both ends of the plane 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.

[0033] In this embodiment, the inclined surface sections 63 of the upper clamp 2 and the lower clamp 3 are mounted in a manner that fits the inclined surface of the octagonal tube main shaft 1 to ensure the coaxiality of the two octagonal tube main shafts 1 .

[0034] In this embodiment, the distance between the planar section 62 of the upper clamp 2 and the planar section 62 of the lower clamp 3 is greater than the diameter of the octagonal tube main shaft 1 to prevent over-constraint installation of the octagonal tube main shaft 1.

[0035] In this embodiment, in order to ensure that the inclined surface of the clamp body 6 fits closely with the inclined surface of the octagonal tube main shaft 1; the opposite side distance of the octagonal tube main shaft 1 is D, the length of the inclined side of the octagonal tube main shaft 1 is L1, the length of the inclined surface section 63 of the clamp body 6 is L2, and the difference between the length of the inclined side of the octagonal tube main shaft 1 and the length of the inclined surface section 63 of the clamp body 6 is L2-L1=0.02D.

[0036] In this embodiment, in order to tightly connect the two octagonal tube main shafts 1 through the upper clamp 2 and the lower clamp 3; the upper clamp 2 and the lower clamp 3 are fixedly installed on the octagonal tube main shaft 1 through long bolts 4 and nuts, and the two ends of the upper clamp 2 are fixedly connected to the two ends of the lower clamp 3 through bolts 5 and nuts so as to be tightly installed on the octagonal tube main shaft 1, the clamp body 6 is provided with a plurality of first bolt holes 61 for passing the long bolts 4, and the first bolt holes 61 are provided on the plane section 62, and the mounting wing plate 7 is provided with a plurality of second bolt holes 71 for passing the bolts 5.

[0037] In this embodiment, the first bolt hole 61 is a circular hole or a strip hole extending along the length direction of the upper clamp 2 and the lower clamp 3 .

[0038] In this embodiment, the second bolt hole 71 is a strip hole or a circular hole extending perpendicularly to the length direction of the upper clamp 2 or the lower clamp 3 .

[0039] In this embodiment, the upper clamp 2 and the lower clamp 3 are formed by casting.

[0040] In this embodiment, the upper hoop 2 and the lower hoop 3 are provided with a plurality of long reinforcing ribs 8 covering the hoop body 6 and the mounting wing plate 7 and a plurality of short reinforcing ribs 9 located at the connection between the hoop body 6 and the mounting wing plate 7. The short reinforcing ribs 9 are arranged between two adjacent long reinforcing ribs 8, and the second bolt hole 71 is arranged between adjacent long reinforcing ribs 8 and short reinforcing ribs 9 to ensure the structural strength of the opening of the mounting wing plate 7.

[0041] Example 2:

[0042] like Figure 4 As shown, this embodiment provides an octagonal tube main shaft connector for multi-point transmission of a photovoltaic bracket. This embodiment is different from the first embodiment in that the upper clamp 2 and the lower clamp 3 are formed by bending, and no reinforcing rib structure is provided.

[0043] Example 3:

[0044] like Figure 5-7 As shown, this embodiment provides an octagonal tube main shaft connector for multi-point transmission of a photovoltaic bracket. This embodiment is different from the first embodiment in that the upper clamp 2 and the lower clamp 3 are formed by stamping and no reinforcing rib structure is provided. In addition, the mounting wing plate 7 of this embodiment is provided with a preset angle.

[0045] In this embodiment, in order to increase the pre-tightening force of the bolt 5, an angle a is formed between the mounting wing plate 7 and the horizontal plane to reserve deformation space for the mounting wing plate 7 so as to ensure that the mounting wing plate 7 is deformed into a horizontal state in the locked state, and the angle a is 1°-5°, preferably 2.5°-3.5°.

[0046] In this embodiment, the first bolt hole 61 is a circular hole or a strip hole extending along the length direction of the upper clamp 2 and the lower clamp 3 .

[0047] In this embodiment, the second bolt hole 71 is a strip hole or a circular hole extending perpendicularly to the length direction of the upper clamp 2 or the lower clamp 3 .

[0048] The present invention optimizes the main shaft cross-section into a regular octagon (with a distance from opposite sides of D). The cross-section of the octagonal tube main shaft 1 is closer to a circle than that of the square tube main shaft. With the same amount of material, it has higher torsional strength. The hypotenuse of the clamp body 6 is extended by ΔL=3mm (ΔL=0.02D). The upper clamp 2 and the lower clamp 3 are close to half an octagon in shape and are divided into a clamp body 6 and a mounting wing plate 7. The clamp body 6 is obtained by extending the hypotenuse length on the basis of half a regular octagon, thereby forming a four-bevel synchronous meshing structure. This configuration increases the contact surface from the two opposite surfaces of the traditional structure to four parallel surfaces in pairs, and the number of contact surfaces is increased from 2 to 4, thereby significantly improving the clamp and The contact area of the main shaft effectively improves the torque transmission efficiency and synchronization accuracy of the main shaft and reduces the angular deviation. The four-way surface contact mode can also effectively suppress circumferential slip and reduce the synchronization deviation of the main shaft. Four strip holes are opened on the clamp body 6 for the long bolt 4 to pass through the two clamps and the main shaft at the same time, so that the clamp and the main shaft are in close contact and fit in four directions. The longitudinal strip holes facilitate the adjustment of the main shaft position. Eight circular holes are opened on the mounting wing plate 7 for locking the bolts 5, or transverse strip holes are opened on the mounting wing plate 7 so that the bolts 5 can still be easily penetrated and installed at the preset angle of the mounting wing plate 7. The preset angle of the mounting wing plate 7 can accurately rebound to a horizontal state after the bolts 5 are tightened, thereby reducing the preload force attenuation rate.

[0049] In the existing clamp, the plastic deformation of the wing plate during the tightening of the bolt 5 (the measured deformation amount is 2-4°) will cause nonlinear attenuation of the preload force, which significantly reduces the bending stiffness of the connection node. In order to ensure the locking of the bolt 5, the present invention reserves deformation compensation space for the wing plate, and sets the installed wing plate 7 to a warped state. When the material is Q355b and the specification of the bolt 5 is M16, the plastic deformation angle of the wing plate is measured to be 2.5°-3.5°. After the bolt 5 is tightened, the wing plate can be deformed to a horizontal state. The initial warping angle θ of the wing plate is optimized to 2.8° through finite element simulation. In the subsequent node strength test, the bending stiffness of the clamp is significantly improved compared with the traditional structure. It is verified that the flatness error of the wing plate after the bolt 5 is tightened is <1° (measured by a spirit level), thereby effectively avoiding the loss of preload force caused by deformation, effectively reducing the attenuation rate of the preload force of the bolt 5, and enhancing the bending stiffness of the node.

[0050] The present invention can adopt an integrated casting process to realize the integrated molding of the clamp without welds, simplify the process, reduce the process complexity, improve the production efficiency, improve the strength of the finished product and the material utilization rate, improve the mechanical properties of the clamp, and pre-set three large reinforcing ribs that penetrate the clamp part and the wing plate part between the upper surface of the clamp and the wing plate, as well as four small reinforcing ribs (rib height h = 4 mm, rib thickness t = 5 mm) connecting the mounting wing plate 7 and the inclined surface of the clamp, and optimize the layout of the reinforcing ribs through finite element simulation.

[0051] The present invention can adopt a multi-station continuous stamping composite forming process or a bending process to achieve weld-free one-piece forming of the clamp, simplify the process, reduce process complexity, improve production efficiency, increase the strength of the finished product and material utilization rate, and improve the mechanical properties of the clamp.

[0052] The above descriptions are merely embodiments of the present invention and are not intended to limit the scope of patent protection of the invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the scope of patent protection of the present invention.

Claims

1. An octagonal tube main shaft connector for multi-point transmission of photovoltaic brackets, used to connect two octagonal tube main shafts, characterized by: It includes an upper clamp and a lower clamp, each of which includes a clamp body adapted to the main shaft profile and mounting wing plates arranged on both sides of the clamp body, and the two mounting wing plates are formed by extending outwards from both sides of the clamp body.

2. The octagonal tube main shaft connector for multi-point transmission of photovoltaic bracket according to claim 1, characterized in that: An included angle a is formed between the mounting wing plate and the horizontal plane to reserve deformation space for the mounting wing plate so as to ensure that the mounting wing plate is deformed into a horizontal state in the locked state, and the included angle a is 1°-5°.

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

4. The octagonal tube main shaft connector for multi-point transmission of a photovoltaic bracket according to claim 3, characterized in that: The inclined sections of the upper and lower clamps are fitted with the inclined surfaces of the octagonal tube main shaft to ensure the coaxiality of the two octagonal tube main shafts. The distance between the flat section of the upper clamp and the flat section of the lower clamp is greater than the diameter of the octagonal tube main shaft to prevent over-constraint installation of the octagonal tube main shaft.

5. The octagonal tube main shaft connector for multi-point transmission of photovoltaic bracket according to claim 3, characterized in that: The opposite side distance of the main axis of the octagonal tube is D, the length of the hypotenuse of the main axis of the octagonal tube is L1, the length of the inclined surface section of the main hoop body is L2, and the difference between the length of the hypotenuse of the main axis of the octagonal tube and the length of the inclined surface section of the main hoop body is L2-L1=0.02D.

6. The octagonal tube main shaft connector for multi-point transmission of a photovoltaic bracket according to claim 1, characterized in that: The upper clamp and the lower clamp are fixedly mounted on the octagonal tube 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 so as to be tightly mounted on the octagonal tube main shaft. The clamp body is provided with a plurality of first bolt holes for passing the long bolts, and the mounting wing is provided with a plurality of second bolt holes for passing the bolts.

7. The octagonal tube main shaft connector for multi-point transmission of a photovoltaic bracket according to claim 6, characterized in that: The first bolt hole is a circular hole or a strip hole extending along the length direction of the upper clamp and the lower clamp, and the second bolt hole is a strip hole or a circular hole extending perpendicular to the length direction of the upper clamp or the lower clamp.

8. The octagonal tube main shaft connector for multi-point transmission of a photovoltaic bracket according to claim 1, characterized in that: The upper hoop and the lower hoop are formed by bending or stamping.

9. The octagonal tube main shaft connector for multi-point transmission of a photovoltaic bracket according to claim 1, characterized in that: The upper hoop and the lower hoop are formed by casting.

10. The octagonal tube main shaft connector for multi-point transmission of a photovoltaic bracket according to claim 9, characterized in that: The upper and lower clamps are provided with a plurality of long reinforcing ribs covering the clamp body and the mounting wing plate and a plurality of short reinforcing ribs located at the connection between the clamp body and the mounting wing plate, and the short reinforcing ribs are provided between two adjacent long reinforcing ribs.

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