Nut pre-screwing device for assembling photovoltaic junction box

Abstract

The utility model relates to a nut pre-screwing device for assembling a photovoltaic junction box, which comprises a connecting seat, a pushing air cylinder and a guide rail are fixed on the connecting seat, the guide rail is connected with a sliding block capable of forming sliding fit with the guide rail, the pushing air cylinder is used for pushing the sliding block to slide along the guide rail, a mounting seat is fixed on the sliding block, and the mounting seat is provided with a nut. The mounting base is connected with a rotating air cylinder, the output end of the rotating air cylinder is connected with a clamping device, the clamping device is used for being matched with bolts and nuts of different specifications and clamping the bolts and the nuts, after the clamping device clamps the bolts and the nuts, the clamping device is driven by the rotating air cylinder to rotate, and the clamping device is driven by a pushing air cylinder to move downwards. The pre-tightening device is matched with the tightening action of the bolt, and pre-tightening of the bolt is achieved. The bolt pre-tightening device has the following advantages and effects that the bolt can be pre-tightened so as to be matched with the tightening stroke of the riveting and tightening all-in-one machine, and the assembling convenience of the photovoltaic junction box is improved.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic junction box assembly technology, specifically to a nut pre-tightening device for photovoltaic junction box assembly. Background Technology

[0002] Photovoltaic junction boxes are mainly used to connect and protect solar photovoltaic modules. They mainly consist of a housing and end caps connected to the housing. When assembling a photovoltaic junction box, a riveting machine is needed to screw bolts into the corresponding threaded holes of the housing and end caps to secure them together.

[0003] In practical use, it was found that the bolt lengths used in different models of photovoltaic junction boxes are not consistent, resulting in differences in the required tightening stroke. However, the tightening stroke of the riveting and tightening machine is generally constant, which can easily lead to the bolt requiring a tightening stroke greater than the tightening stroke of the riveting and tightening machine. Consequently, the riveting and tightening machine cannot tighten the bolt properly, requiring manual intervention. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a nut pre-tightening device for photovoltaic junction box assembly, which can pre-tighten the bolts to match the tightening stroke of the riveting and tightening machine, thereby improving the convenience of photovoltaic junction box assembly.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a nut pre-tightening device for photovoltaic junction box assembly, comprising a connecting seat, a push cylinder and a guide rail fixedly mounted on the connecting seat, a slider that can slide with the guide rail connected to the guide rail, the push cylinder for pushing the slider to slide along the guide rail, the slider being fixedly mounted on a mounting seat, a rotary cylinder connected to the mounting seat, and a clamping device connected to the output end of the rotary cylinder, the clamping device being adapted to and clamping bolts and nuts of different specifications, after the clamping device clamps the bolts and nuts, the rotary cylinder drives the clamping device to rotate, and the push cylinder drives the clamping device to move downward to match the tightening action of the bolt, thereby achieving pre-tightening of the bolt.

[0006] The present invention is further configured such that: the clamping device includes a drive motor and a mounting frame; the drive motor is connected to the output end of a rotary cylinder; a drive gear is rotatably connected to the bottom center of the mounting frame; the output end of the drive motor is connected to the drive gear to drive the drive gear to rotate; a plurality of connecting rods are provided around the drive gear on its outer periphery; one end of each connecting rod is provided with a transmission tooth that meshes with the drive gear; the other end extends outward from the mounting frame as an extension end; a clamping rod is fixed to the extension end; the drive motor drives the drive gear to rotate, thereby causing each clamping rod to close inward, thereby clamping the bolts and nuts.

[0007] The present invention is further configured such that a removable anti-slip pad is fitted around the outer periphery of the clamping rod.

[0008] The present invention is further configured such that: the top of the clamping rod is provided with a threaded hole, and a limiting screw is provided in the threaded hole; the limiting screw can form a threaded engagement with the threaded hole; the head of the limiting screw is provided with a limiting part that is offset outward; the limiting part is used to axially limit the anti-slip pad and prevent the anti-slip pad from falling off the clamping rod.

[0009] The present invention is further configured to include a slide table, wherein the slide table is connected to a connecting platform, and the connecting seat is fixed to the slide table.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] By setting up a nut pre-tightening device in the auxiliary riveting and tightening machine, before the machine tightens the bolt, the clamping device clamps the bolt's nut and then rotates the clamping device via a rotary cylinder. Simultaneously, the cylinder pushes the clamping device to feed in the direction of bolt movement, thus pre-tightening the bolt by a certain number of turns. This ensures that the subsequent tightening stroke of the bolt is less than the tightening stroke of the riveting and tightening machine, guaranteeing that the machine can tighten the bolt. Therefore, this effectively solves the problem of requiring manual tightening of bolts a certain number of turns when assembling certain specifications of photovoltaic junction boxes using existing riveting and tightening machines, thereby improving the convenience of photovoltaic junction box assembly. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model without the slide table installed;

[0013] Figure 2 This is a schematic diagram of the overall structure of this utility model (I);

[0014] Figure 3 This is a schematic diagram of the overall structure of the present invention (II);

[0015] Figure 4 This is an exploded structural diagram of the clamping device in this utility model. Detailed Implementation

[0016] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] like Figures 1 to 4 As shown, this utility model discloses a nut pre-tightening device for photovoltaic junction box assembly, including a connecting base 1. A push cylinder 2 and a guide rail 3 are fixed to the connecting base 1. The guide rail 3 is arranged vertically, and a slider 4 that can slide with the guide rail 3 is connected to the guide rail 3. The piston rod end of the push cylinder 2 is connected to the slider 4 via a push block 12, used to drive the slider 4 to move up and down along the guide rail 3. A mounting base 11 is fixed on the slider 4, and a rotary cylinder 5 is mounted on the bottom of the mounting base 11. The output shaft of the rotary cylinder 5 faces downward and is connected to a clamping device 6. The output end of the rotary cylinder 5 is connected to the clamping device 6, which is used to adapt to and clamp bolts and nuts of different specifications. After the clamping device 6 clamps the bolt and nut, the rotary cylinder 5 drives the clamping device 6 to rotate, and the push cylinder 2 drives the clamping device 6 to move downward, thus matching the tightening action of the bolt and achieving pre-tightening of the bolt, i.e., pre-tightening the bolt by rotating it a certain number of turns.

[0019] The clamping device 6 includes a drive motor 61 and a mounting bracket 62. The drive motor 61 is fixed to the output end of the rotary cylinder 5, and a drive gear 63 is rotatably connected to the bottom center of the mounting bracket 62 via a bearing. The output end of the drive motor 61 passes through the mounting bracket 62 and is coaxially connected to the drive gear 63. Three connecting rods 64 are evenly distributed circumferentially around the outer periphery of the drive gear 63. One end of each connecting rod 64 is provided with a transmission tooth 641 that meshes with the drive gear 63, and the other end extends outward from the mounting bracket 62 to form an extension end, on which a vertically arranged clamping rod 65 is fixed. When the drive motor 61 drives the drive gear 63 to rotate, the transmission tooth 641 drives each connecting rod 64 to swing around the hinge point, causing the clamping rod 65 to close inward or open outward, thereby clamping or releasing bolts and nuts of different specifications.

[0020] The clamping rod 65 is fitted with a removable anti-slip pad 7 on its outer periphery. The anti-slip pad 7 is made of rubber and has anti-slip textures on its surface to enhance friction, thereby ensuring stable clamping of the bolt nut. The top of the clamping rod 65 has a threaded hole with a limiting thread inside. The head of the limiting screw 8 has a limiting part 81 that is offset outward. By screwing the limiting screw into the threaded hole, the limiting part 81 can be made to abut against the top of the anti-slip pad 7, preventing the anti-slip pad 7 from axially falling off. Furthermore, when it is necessary to replace the anti-slip pad 7, the limiting screw 8 can be unscrewed from the threaded hole, allowing the anti-slip pad 7 to be quickly removed from the clamping rod 65 for easy replacement.

[0021] In addition, in this embodiment, a slide table 9 is further added. This slide table 9 can use an existing structure, such as a ball screw or linear motor for movement. The slide table 9 is connected to a connecting platform 10, and the nut pre-tightening device is fixed to the connecting platform 10 via a connecting seat 1. Thus, after the bolt pre-tightening is completed, the slide table 9 moves the pre-tightening device away from the bolt pre-tightening position, thereby avoiding interference with the subsequent bolt tightening by the riveting and tightening machine.

[0022] The working process of the device is as follows: First, the pre-tightening device is moved to the bolt pre-tightening position of the photovoltaic junction box by the slide table 9. Then, the drive motor 61 drives the drive gear 63 to rotate, causing the clamping rod 65 to open, so that the bolt nut can be inserted between the clamping rods 65. The drive motor 61 reverses, the clamping rods 65 close and clamp the bolt nut through the anti-slip pad 7. Then, the rotary cylinder 5 drives the clamping device 6 to rotate, and at the same time pushes the cylinder 2 to push the slider 4 to move down, completing the pre-tightening of the nut. After the pre-tightening is completed, the clamping rod 65 opens and resets, and pushes the cylinder 2 to drive the clamping device 6 to rise and reset. Then, the slide table 9 drives the pre-tightening device away from the pre-tightening position.

[0023] It should be noted that in this embodiment, the drive motor 61 is a servo motor, and the sequence of actions of the drive motor 61, the rotary cylinder 5, and the push cylinder 2 is controlled by the servo motor's built-in timer and an external PLC controller. Specifically, the time t1 required for the drive motor 61 to move the clamping rod 65 inward to clamp the bolt and nut is first measured. Based on time t1, the required delay time t2 is input to the timer in the control program. t2 must not be less than t1, ensuring that the clamping rod 65 stably clamps the bolt and nut before the rotary cylinder 5 and push cylinder 2 move. After the timer counts to t2, the PLC controller then controls the rotary cylinder 5 and push cylinder 2 to perform the aforementioned actions, thus completing the pre-tightening of the nut. The above electrical control logic is conventional technology and will not be elaborated further.

[0024] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A nut pre-tightening device for photovoltaic junction box assembly, characterized in that, The utility model provides a kind of screw pre-tightening device, including connecting seat, the connecting seat is fixed with push cylinder and guide rail, the guide rail is connected with the sliding block that can be formed with guide rail sliding fit, the push cylinder is used to push the sliding block along guide rail sliding, the sliding block is fixed with mounting seat, the mounting seat is connected with rotary cylinder, the output end of the rotary cylinder is connected with clamping device, the clamping device is used to adapt to different specifications of bolt cap nut, and clamping is carried out, after clamping device is clamped bolt cap nut, it is rotated by rotary cylinder and is driven clamping device, to meet the tightening action of bolt, realize the pre-tightening of bolt.

2. A cap pre-tightening device for photovoltaic junction box assembly according to claim 1, characterized in that, The clamping device includes a drive motor and a mounting bracket. The drive motor is connected to the output end of the rotary cylinder. A driving gear is rotatably connected to the center of the bottom of the mounting bracket. The output end of the drive motor is connected to the driving gear to drive the driving gear to rotate. A plurality of connecting rods are arranged around the driving gear on the outer periphery of the driving gear. One end of each connecting rod is provided with a transmission gear that meshes with the driving gear. The other end of each connecting rod extends outward as an extension end. A clamping rod is fixed to the extension end. The drive motor drives the driving gear to rotate, which in turn drives each clamping rod to fold inward, thereby clamping the bolt cap nut.

3. A cap pre-tightening device for photovoltaic junction box assembly according to claim 2, characterized in that, A detachable non-slip pad is sleeved on the outer periphery of the clamping rod.

4. A cap pre-tightening device for photovoltaic junction box assembly according to claim 3, characterized in that, A threaded hole is provided at the top of the clamping rod. A limiting screw is arranged in the threaded hole. The limiting screw can be threadedly connected to the threaded hole. The head of the limiting screw is provided with a limiting portion that is offset outward. The limiting portion is used to axially limit the non-slip pad to prevent the non-slip pad from falling off the clamping rod.

5. A cap pre-tightening device for photovoltaic junction box assembly according to claim 1, characterized in that, The utility model also includes a sliding table. A connecting table is connected to the sliding table. The connecting seat is fixed to the sliding table.

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