Photovoltaic tracking support main shaft connecting structure

Abstract

The utility model provides a kind of photovoltaic tracking support main shaft connecting structure, including first main shaft and second main shaft, first main shaft and second main shaft are tubular structure, the rear end of first main shaft has necking section, and the necking section is connected with the front end of second main shaft cooperation;At least two groups of first hole positions are set on necking section, and the front end of second main shaft is equipped with the second hole position corresponding to the number of first hole position group;Two first connecting holes are in each group of first hole position, two second connecting holes are in each group of second hole position, and each group of first hole position and second hole position are locked and fixed by U-type bolt.The utility model structure design is reasonable and effective, is connected by U-type bolt, and use cost is low, can effectively reduce construction difficulty, need not special tool, install conveniently, can simultaneously disperse the stress of balance hole wall, guarantee the stability and reliability of fixed, with good environmental adaptability, torsional resistance, and the safety of photovoltaic tracking support for assembly is high.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a main shaft connection structure for a photovoltaic tracking bracket. Background Technology

[0002] With the rapid development of the photovoltaic industry, the market share of tracking brackets is increasing. Currently, the connection between the main shafts of photovoltaic tracking brackets, especially the design and installation of the central column in flexible mountain brackets, mainly adopts the following method: The left and right main shafts are bolted together using shaft clamps. Through holes are drilled on one side of the main shaft and both sides of the clamp. The clamp holds the two main shafts together, and then they are connected with through bolts. The clamp is then self-locked with bolts, finally fixing the two main shafts in place. However, this method is generally suitable for situations where the left and right main shafts have the same outer cross-section, and it also has some problems:

[0003] ① After the main shaft clamp is installed, the clamp bolts do not reach the pre-tightening force, and there is misalignment between the two main shafts, resulting in a loose connection between the clamp and the main shaft, which affects the synchronization of the entire photovoltaic panel.

[0004] ② This clamp connection method cannot achieve face-to-face contact between the left and right main shafts. The hole wall at the through bolt hole bears a large pressure and is prone to local damage. Under strong wind conditions, it is easy to cause torsional damage to the main shaft, thereby paralyzing the entire tracking system.

[0005] ③ The connection method of the clamp: During the rotation of the photovoltaic module, friction will be generated between the two main shafts and the clamp, which will produce noise. The friction will damage the zinc layer on the surface, affect the anti-rust effect, and increase maintenance costs.

[0006] To address the shortcomings of the clamp and bolt fixing method, another spindle connection method exists: the spindle end is narrowed and inserted into another spindle, then secured with bolts. However, currently, it's difficult to achieve a secure hold with ordinary bolts after narrowing the end. Alternatively, a long bolt is used to penetrate the spindle, which places significant pressure on the spindle hole wall, and ordinary threads still cannot provide a secure bolt hold, posing a risk of tearing the spindle hole wall. Furthermore, this method cannot meet the requirements for left-right spindle adjustment. Utility Model Content

[0007] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a photovoltaic tracking bracket main shaft connection structure, which can effectively connect and fix the main shaft, facilitate assembly, adjust and position as needed, and ensure reliable positioning.

[0008] The technical solution adopted by this utility model to solve its technical problem is: a photovoltaic tracking bracket main shaft connection structure, including a first main shaft and a second main shaft, both of which are tubular structures. The rear end of the first main shaft has a constricted section, which is connected to the front end of the second main shaft. At least two sets of first holes are provided on the constricted section, and the front end of the second main shaft is provided with second holes corresponding to the number of sets of first holes on the constricted section. Each set of first holes has two first connecting holes, and each set of second holes has two second connecting holes. Each set of first holes and second holes are locked and fixed by U-bolts.

[0009] In the above solution, to address the issue of tearing at the spindle holes caused by the original use of ordinary bolts for tightening, a narrowing design is adopted at the connection point between the first and second spindles. U-bolts are then used to lock the first and second spindles together at the narrowed section. This decomposes the force on a single hole into a distributed force across both ends of the U-bolt, effectively distributing the force across each hole on the spindle and preventing excessive stress on a single hole that could lead to tearing. Furthermore, the number of hole groups and the spacing between adjacent groups on the first spindle can be designed according to actual usage requirements, allowing for selection during assembly and achieving adjustable positioning and connection spacing.

[0010] Furthermore, in the hole design of the holes, the two first connecting holes in each group of first hole positions are elongated holes, and the spacing direction of the elongated holes is parallel to the axis of the first spindle; in each group of second hole positions, at least one of the two second connecting holes is a round hole, and the other second connecting hole is either a round hole or an elongated hole, with the spacing direction of the elongated hole parallel to the axis of the second spindle. The elongated hole design of the first connecting holes on the first spindle makes it easier to adjust the connection position between the first and second spindles as needed when they are connected. The fact that the second spindle has at least one round hole in the second connecting hole design further improves the reliability and stability of the positioning.

[0011] Furthermore, adjacent sets of first holes are sequentially spaced along the axis of the first spindle, and adjacent sets of first holes are not on the same straight line. This non-linear hole design allows the first and second spindles to be locked and positioned from different circumferential positions after being connected by U-bolts, improving the reliability of the connection and locking.

[0012] In the threaded fixing of U-bolts, after the U-bolt connects the corresponding first connecting hole and the second connecting hole, the first connecting hole and the second connecting hole are positioned and fixed by the nut and the flat washer. A spring washer is also elastically provided between the nut and the washer. The cooperation of the spring washer and the flat washer further effectively balances the force during the threaded connection process and reduces the risk of hole tearing.

[0013] Furthermore, the rear end of the first spindle is connected to the constricted section via a transition section with a variable diameter.

[0014] Furthermore, the outer diameter of the constricted section is smaller than the inner diameter of the inner circumference of the front end of the second spindle, meaning there is a gap between the outer circumference of the constricted section and the inner circumference of the front end of the second spindle, with the gap ranging from 0.5mm to 3mm. This constriction and gap design facilitates subsequent mating and insertion installation.

[0015] Furthermore, the radial cross-section of the constricted section of the first spindle is polygonal, and the front end of the second spindle is adapted to conform to this polygon. Through the polygonal cross-section tubular design, radial torsion between the first and second spindles can be effectively prevented after the bolts are locked, further improving the reliability and stability of the connection.

[0016] Furthermore, the polygon is octagonal, and the first spindle has four sets of first holes, with adjacent sets of first holes located on two non-adjacent sides of the octagon. The spacing of the holes on the spaced surfaces makes the distribution of holes on the circumferential surface of the spindle more rational.

[0017] The beneficial effects of this utility model are that the photovoltaic tracking bracket main shaft connection structure provided by this utility model has a reasonable and effective structural design. It is connected by U-bolts, which has low usage cost, can effectively reduce construction difficulty, does not require special tools, is convenient to install, and can distribute and balance the force on the hole wall, ensuring the stability and reliability of the fixation. It has good environmental adaptability and torsional resistance, and the photovoltaic tracking bracket used for assembly has high safety. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the preferred embodiment of the present invention.

[0020] Figure 2 This is an exploded view of the preferred embodiment of this utility model.

[0021] Figure 3 This is a side view of the preferred embodiment of the present invention.

[0022] Figure 4 This is a partial sectional view of the location of the U-bolt in the preferred embodiment of this utility model.

[0023] Figure 5 This is a perspective view of the U-shaped bolt, the preferred embodiment of this utility model.

[0024] Figure 6 This is a schematic diagram of the structure of the first main shaft in the preferred embodiment of this utility model.

[0025] Figure 7 This is a schematic diagram of the structure of the second main shaft in the preferred embodiment of this utility model.

[0026] In the figure: 1. First spindle 1-1, 2. First long slotted hole, 3. Second spindle 2-1, 4. Second long slotted hole 2-2, 5. Second round hole, 6. Transition section, 7. U-bolt group 4-1, 8. U-bolt 4-2, 9. Flat washer 4-3, 10. Spring washer 4-4, 10. Nut. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components relevant to the present invention. Orientations and references (e.g., up, down, left, right, etc.) are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0028] like Figures 1 to 4 The photovoltaic tracking bracket main shaft connection structure shown is the preferred embodiment of this utility model. This photovoltaic tracking bracket main shaft connection structure includes a first main shaft 1 and a second main shaft 2.

[0029] like Figure 6 and Figure 7 As shown, both the first spindle 1 and the second spindle 2 are tubular structures. The rear end of the first spindle 1 has a tapered section. The main body of the first spindle 1 is connected to the tapered section via a diameter-changing section, and the tapered section mates with the front end of the second spindle 2. The outer diameter of the outer circumference of the tapered section is smaller than the inner diameter of the inner circumference of the front end of the second spindle 2, meaning there is a gap between the outer circumference of the tapered section and the inner circumference of the front end of the second spindle 2, with the gap ranging from 0.5mm to 3mm. The tapering and gap facilitate subsequent mating and installation.

[0030] In the tubular design of the first spindle 1 and the second spindle 2, the first spindle 1 and the second spindle 2 can be round tubes or tubes with polygonal cross sections, such as square tubes, rectangular tubes, octagonal tubes, etc.

[0031] Compared to a circular tube, the polygonal cross-section design effectively prevents radial torsion between the first spindle 1 and the second spindle 2 after bolt locking, further improving the reliability and stability of the connection. In this embodiment, the polygon is octagonal, and both the first spindle 1 and the second spindle 2 are preferably octagonal tubes.

[0032] Four sets of first holes are provided on the constricted section of the first spindle 1. The two adjacent sets of first holes are located on two non-adjacent sides of the octagon, that is, they are set at a interval of one face in the eight circumferential faces of the octagonal tube, so that the distribution of holes on the circumferential surface of the spindle is more uniform and reasonable.

[0033] The front end of the second spindle 2 is provided with second holes corresponding to the constricted section, which are one-to-one with the first holes in each group. Each group of first holes has two first connecting holes, and each group of second holes has two second connecting holes. The first holes and the second holes in each group are locked and fixed by U-bolts 4-1.

[0034] In this embodiment, there are four sets of first holes, each set on one of the four spaced faces of the octagonal tube. Correspondingly, the second spindle 2 also has a set of second holes designed on one of the four spaced faces of the octagonal tube. Each pair of adjacent sets of first holes is not only not on the same straight line, but is also spaced one face apart. This allows the first spindle 1 and the second spindle 2 to be locked and positioned from different circumferential positions after being connected by U-bolts 4-1, improving the reliability of the connection. Simultaneously, the holes are also staggered along the axial direction, further evenly distributing the forces on the tubes during connection.

[0035] In the hole design of the hole positions, the two first connecting holes of each group of first hole positions are elongated holes, labeled as first elongated holes 1-1 in the figure, and the hole spacing direction of the elongated holes is parallel to the axis direction of the first main shaft 1. Adjacent groups of first hole positions are arranged alternately along the axis direction of the first main shaft 1, and adjacent groups of first hole positions are not on the same straight line.

[0036] The preferred hole type for the two second connecting holes in each group of second holes is a round hole and a long slotted hole, labeled as the second round hole 2-2 and the second long slotted hole 2-1 in the figure. The hole spacing direction of the long slotted hole is parallel to the axis direction of the second main shaft 2.

[0037] In the hole design, the first connecting hole on the first spindle 1 adopts an elongated slotted hole design, which makes it easier to adjust the connection position between the first spindle 1 and the second spindle 2 as needed when they are connected. In the hole design of the second connecting hole of the second spindle 2, the second elongated slotted hole 2-1 facilitates alignment with the first connecting hole when adjusting the position, while the second round hole 2-2 connects with the first elongated slotted hole 1-1, ensuring the reliability and firmness of the positioning.

[0038] In the actual design, the first elongated hole 1-1 and the second elongated hole 2-1 have the same hole shape and size. Thus, when locked, the hole spacing of the elongated holes is the adjustable size range when the two spindles are connected. For example, in this embodiment, the hole spacing of the first elongated hole 1-1 and the second elongated hole 2-1 is 20mm. The first spindle 1 and the second spindle 2 can be adjusted ±20mm along the length of the spindle. This adjustment can effectively solve the installation error problem between the rotary drives of the two spindles connected separately.

[0039] like Figure 4 and Figure 5 As shown, the first and second holes in each group are secured by a U-bolt 4-1 with a nut 4-4 and a flat washer 4-2 through threaded locking. In this U-bolt group 4 fixing, a spring washer 4-3 is also elastically provided between the nut 4-4 and the washer. The cooperation of the spring washer 4-3 and the flat washer 4-2 further effectively balances the force during the threaded connection process. The U-bolt 4-1 can also better decompose the force, reducing the risk of tearing at each hole on the spindle wall.

[0040] In actual bolt selection, the U-bolt 4-1 is not limited to a specific size and can be between M10 and M16. The U-bolt 4-1 is not always a circular cross-section; to better fit the inner wall of the pipe, the middle section of the U-bolt 4-1 can be forged into a rectangular cross-section. The U-bolt 4-1 can be paired with a flat washer 4-2, a spring washer 4-3, or a nut 4-4, or directly with a hexagonal flange face lock nut 4-4.

[0041] Installation steps:

[0042] ① First, insert the first spindle 1 into the second spindle 2. Before inserting, it is necessary to distinguish the position of the lower hole and use the constricted section to cooperate with the second spindle 2.

[0043] ② Insert the U-bolt 4-1 through the first long slot 1-1 and out through the second round hole 2-2 and the second long slot 2-1.

[0044] ③ Use flat washer 4-2, spring washer 4-3 and nut 4-4 to pre-tighten U-bolt 4-1. Since it is U-bolt 4-1, a regular wrench or electric wrench can be used directly without special tools.

[0045] ④ After adjusting the two spindles to the appropriate positions through the first long waist hole 1-1 and the second long waist hole 2-1, tighten the nut 4-4 to connect and fix the first spindle 1 and the second spindle 2.

[0046] This photovoltaic tracking bracket spindle connection structure addresses the problem of tearing at the spindle holes caused by conventional bolt tightening. At the connection point between the first spindle 1 and the second spindle 2, the first spindle 1 is designed with a narrowed end. U-bolts 4-1 are used to lock the first spindle 1 and the second spindle 2 together at the narrowed end. This decomposes the force on a single hole into a distributed force distribution across the two ends of the U-bolts 4-1, effectively distributing the force across each hole on the spindle and preventing excessive stress on a single hole that could lead to tearing. Furthermore, the number of hole groups and the spacing between adjacent groups of holes on the first spindle 1 can be designed according to actual usage requirements, allowing for selection during assembly and adjustable positioning connection spacing. Using this connection structure to connect the spindle offers the following advantages:

[0047] I. Reduced construction difficulty. Adjustment is possible within ±20mm along the spindle direction, resolving the installation error issue between the two rotary drives;

[0048] Second, it saves costs, especially installation costs. No clamps or long bolts are needed, and no special tools are required.

[0049] Third, it possesses excellent torsional resistance, enhancing product safety.

[0050] IV. Excellent environmental adaptability. All products are manufactured in-house; now only assembly is required.

[0051] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A photovoltaic tracking bracket spindle connection structure, comprising a first spindle and a second spindle, characterized in that: Both the first spindle and the second spindle are tubular structures. The rear end of the first spindle has a constricted section, which is connected to the front end of the second spindle. The constricted section is provided with at least two sets of first holes, and the front end of the second spindle is provided with second holes corresponding to the number of sets of first holes on the constricted section. Each group of first holes has two first connecting holes, and each group of second holes has two second connecting holes. The first and second holes in each group are locked together by U-bolts.

2. The photovoltaic tracking bracket main shaft connection structure as described in claim 1, characterized in that: The two first connecting holes of each first hole position are long slotted holes, and the hole spacing of the long slotted holes is parallel to the direction of the first spindle axis. At least one of the two second connecting holes in each group of second holes is a round hole, and the other second connecting hole is either a round hole or an oblong hole. The hole spacing of the oblong hole is parallel to the direction of the second spindle axis.

3. The photovoltaic tracking bracket main shaft connection structure as described in claim 1, characterized in that: The first holes in two adjacent groups are arranged at intervals along the axis of the first main shaft, and the first holes in two adjacent groups are not on the same straight line.

4. The photovoltaic tracking bracket main shaft connection structure as described in claim 1, characterized in that: After the U-bolt connects the corresponding first connecting hole and the second connecting hole, the first connecting hole and the second connecting hole are positioned and fixed by the nut and the flat washer. A spring washer is also elastically provided between the nut and the washer.

5. The photovoltaic tracking bracket main shaft connection structure as described in claim 1, characterized in that: The rear end of the first spindle is connected to the constricted section via a transition section with a variable diameter.

6. The photovoltaic tracking bracket main shaft connection structure as described in claim 1, characterized in that: The outer diameter of the constricted section is smaller than the inner diameter of the inner circumference of the front end of the second spindle, that is, there is a gap between the outer circumference of the constricted section and the inner circumference of the front end of the second spindle, and the gap ranges from 0.5mm to 3mm.

7. The photovoltaic tracking bracket main shaft connection structure as described in claim 1, characterized in that: The radial cross-section of the narrowed section of the first spindle is a polygon, and the front end of the second spindle is adapted to conform to the polygon.

8. The photovoltaic tracking bracket main shaft connection structure as described in claim 7, characterized in that: The polygon is octagonal, and the first main shaft has four sets of first holes, with two adjacent sets of first holes located on two non-adjacent sides of the octagon.

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