A solar photovoltaic cell support assembly assembly apparatus and process

Abstract

The present application relates to the technical field of photovoltaic assembly, especially to a solar photovoltaic cell support assembly equipment and process, comprising a machine tool, a first linear motor set and a second linear motor set are installed on the top outer wall of the machine tool, and a positioning mechanism and a fastening mechanism are arranged on the machine tool, the positioning mechanism is arranged, when working, the cantilever drives the end of the beam clamping block to abut, the clamping effect of the beam is realized, because the cantilevers are symmetrically distributed on the two sides of the pair of inclined beam clamping blocks, in the clamping process, the positioning work of the beam perpendicular to the inclined beam direction is automatically completed, the subsequent only needs to complete the positioning of the beam parallel to the inclined beam direction through the first positioning motor, the alignment of the bolt hole can be realized, and the device is driven positioning through four groups of independent motors, so that the device can assemble supports of different size specifications, and the practicability of the device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic assembly, in particular to a solar photovoltaic cell support assembly equipment and process. BACKGROUND

[0002] The solar photovoltaic cell needs to be stably supported on the ground by a support assembly, wherein the support assembly includes a column, a diagonal beam and a cross beam which need to be assembled together by bolt connection, and in order to reduce the work steps of on-site installation, the factory has begun to modularly assemble the support assembly, such as assembling the diagonal beam and the cross beam together in advance, and then transporting to the site and directly installing on the column;

[0003] However, the positioning of the bolt hole is required during the assembly of the support assembly, and after the positioning of the bolt hole is completed, the fastening operation of multiple groups of bolts is also required, and the work efficiency is low by relying on manpower to move and fasten the bolts. SUMMARY

[0004] The purpose of the present application is to solve the shortcomings in the prior art, and a solar photovoltaic cell support assembly equipment and process is proposed, the positioning mechanism is arranged, so that when working, the cantilever drives the cross beam clamping block to abut against the end of the cross beam, the effect of clamping the cross beam is realized, since the cantilevers are symmetrically distributed on both sides of the pair of diagonal beam clamping blocks, the positioning work of the cross beam perpendicular to the diagonal beam direction based on the diagonal beam can be automatically completed during clamping, and only the positioning of the cross beam parallel to the diagonal beam direction needs to be completed by the first positioning motor, so that the alignment of the bolt hole can be realized, and the device is driven by four independent motors for positioning, so that the device can assemble supports of different size specifications, and the practicality of the device is improved.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a solar photovoltaic cell support assembly equipment, comprising a machine tool, wherein a first linear motor group and a second linear motor group are mounted on the top outer wall of the machine tool, and the machine tool is provided with a positioning mechanism and a fastening mechanism. The positioning mechanism includes a pair of inclined beam blocks and a pair of crossbeam blocks. The pair of inclined beam blocks are fixed on the outer walls of the two output ends of the first linear motor group. When adjusting the distance between the inclined beams, the first linear motor group drives the two inclined beam blocks to slide in opposite directions. A pair of cantilever arms symmetrically distributed on both sides of the pair of inclined beam blocks are fixed on the output end of the second linear motor group. A movable frame is slidably inserted into the outer wall of the two cantilever arms on the side closest to each other. A sliding frame is slidably inserted into the outer wall of each movable frame. A pair of crossbeam locking blocks are inserted. A second positioning motor is fixed on the outer wall of the movable frame. A second screw is installed on the main shaft of the second positioning motor. The pair of crossbeam locking blocks are fitted onto the outer wall of the second screw through oppositely screwed threads. When adjusting the crossbeam spacing, the second positioning motor drives the two crossbeam locking blocks to slide in opposite directions. The fastening mechanism includes a first slide block and a second slide block. A pair of first slide rods are welded to the outer wall of each inclined beam locking block. A pair of second slide rods are welded to the outer wall of each crossbeam locking block. A second slide block is slidably fitted onto the outer wall of the first slide rod and the second slide rod located above the inclined beam locking block. A nut slot is provided on the outer wall of the first slide block. An electric wrench for tightening bolts is installed on the outer wall of the second slide block.

[0006] Preferably, a receiving platform is provided on the outer wall of the machine tool.

[0007] Preferably, each of the cantilever arms has a first sliding groove on the outer wall of the side that is close to each other for slidingly inserting the moving frame, each of the cantilever arms has a first positioning motor installed on the end arm, each of the first positioning motors has a first screw extending into the first sliding groove on its main shaft, and each moving frame is threadedly fitted onto the outer wall of the first screw on the same side.

[0008] Preferably, each of the movable frames has a second sliding groove on its outer wall for slidingly inserting the crossbeam block.

[0009] Preferably, a pair of first sliding rods perpendicular to the movement direction of the inclined beam block are welded to the upper and lower outer walls of each of the inclined beam blocks, and a pair of second sliding rods perpendicular to the movement direction of the crossbeam blocks are welded to the upper and lower outer walls of each of the crossbeam blocks, wherein the first sliding rods and the second sliding rods are perpendicular to each other in space.

[0010] Preferably, a pair of first slide blocks are slidably fitted on the outer wall of each first slide rod located below the inclined beam block, and each pair of first slide blocks is slidably fitted on the outer wall of a second slide rod on the same side as the first slide rod. A pair of second slide blocks are slidably fitted on the outer wall of each first slide rod located above the inclined beam block, and each pair of second slide blocks is slidably fitted on the outer wall of a second slide rod on the same side as the first slide rod.

[0011] Preferably, a pair of guide rods are provided on the outer wall of the first slide block on the side away from the inclined beam block, and the guide rods are slidably inserted into the outer wall near the inclined beam block. The distance between the pair of guide rods is greater than the diameter of the bolt and less than the outer tangent circle diameter of the nut.

[0012] Preferably, each of the second slides is equipped with an electric push rod on its outer wall, and an electric wrench is fixed on the outer wall of the output end of each electric push rod.

[0013] The present invention also provides a process for assembling a solar photovoltaic cell support module, comprising the following steps:

[0014] S1: Place the inclined beam in the inclined beam clamp and the horizontal beam in the horizontal beam clamp;

[0015] S2: Start the first linear motor group to drive the two inclined beam blocks to move away from each other;

[0016] S3: Start the second positioning motor to drive the two crossbeam blocks to move away from each other;

[0017] S4: When the bolt holes are aligned, the electric push rod is extended, causing the electric wrench to move down, so that the bolt pre-installed in the socket on the electric wrench is inserted into the bolt hole.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The present invention, through its positioning mechanism, enables the cantilever to drive the crossbeam clamping block to abut against the end of the crossbeam during operation, thereby clamping the crossbeam. Since the cantilever is symmetrically distributed on both sides of a pair of inclined beam clamping blocks, it can automatically complete the positioning of the crossbeam perpendicular to the inclined beam during the clamping process. Subsequently, the positioning of the crossbeam parallel to the inclined beam is completed by the first positioning motor, thereby aligning the bolt holes. Furthermore, the device uses four sets of independent motors to drive the positioning, enabling the device to assemble brackets of different sizes and specifications, thus improving the practicality of the device.

[0020] 2. The present invention, through its fastening mechanism, enables the device to achieve a cross-positioning effect via the first and second sliding rods. When the bolt holes are aligned, the first and second sliding rods align with the bolt holes. After alignment, the electric push rod is extended, causing the electric wrench to move downwards. This allows the bolt pre-installed in the sleeve of the electric wrench to be inserted into the bolt hole, activating the electric wrench and automatically tightening the bolt and the nut in the nut slot. The device can simultaneously tighten multiple sets of bolts, improving work efficiency.

[0021] 3. The present invention uses a guide rod to control the cantilever to move away from each other after assembly by the second linear motor group, so that the crossbeam block is separated from the crossbeam. At this time, the assembled bracket is pulled from the side of the receiving platform, so that the inclined beam slides out from the opening of the inclined beam block. When the nut slides out from the nut slot on the first slide block, the bolt can slide along the guide rod to the receiving platform, achieving the effect of rapid material unloading. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention in its working state;

[0023] Figure 2 This is a three-dimensional sectional view of the overall structure of the present invention;

[0024] Figure 3 This is a three-dimensional schematic diagram of the working state of the positioning mechanism of the present invention;

[0025] Figure 4 This is a three-dimensional sectional view of the cantilever and movable frame of the present invention;

[0026] Figure 5 This is a three-dimensional schematic diagram of the fastening mechanism of the present invention;

[0027] Figure 6 This is a schematic cross-sectional view of the first slide block of the present invention.

[0028] Legend:

[0029] 1. Machine tool; 11. First linear motor group; 12. Second linear motor group; 13. Receiving platform; 2. Inclined beam clamp; 21. First slide rod; 3. Cantilever; 31. First slide groove; 32. First positioning motor; 321. First screw; 4. Moving frame; 41. Second slide groove; 42. Second positioning motor; 421. Second screw; 43. Crossbeam clamp; 44. Second slide rod; 5. First slide block; 51. Nut slot; 52. Guide rod; 6. Second slide block; 61. Electric push rod; 62. Electric wrench. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] See Figures 1 to 6 As shown, a solar photovoltaic cell support assembly equipment includes a machine tool 1. A first linear motor group 11 and a second linear motor group 12 are installed on the top outer wall of the machine tool 1. The machine tool 1 is provided with a positioning mechanism and a fastening mechanism. A receiving platform 13 is provided on the outer wall of the machine tool 1.

[0032] The positioning mechanism includes a pair of inclined beam blocks 2 and a pair of crossbeam blocks 43. The pair of inclined beam blocks 2 are fixed on the outer walls of the two output ends of the first linear motor assembly 11. When adjusting the distance between the inclined beams, the first linear motor assembly 11 drives the two inclined beam blocks 2 to slide in opposite directions. A pair of cantilever arms 3 symmetrically distributed on both sides of the pair of inclined beam blocks 2 are fixed on the output end of the second linear motor assembly 12. A movable frame 4 is slidably inserted into the outer wall of the side of the two cantilever arms 3 that are close to each other. A pair of crossbeam blocks 43 are slidably inserted into the outer wall of each movable frame 4. A second positioning motor 42 is fixed on the outer wall of the movable frame 4. A second screw 421 is installed on the main shaft of the second positioning motor 42. Block 43 is fitted onto the outer wall of the second screw 421 by threads with opposite rotation. When adjusting the beam spacing, the second positioning motor 42 drives the two beam locking blocks 43 to slide in opposite directions. Each cantilever 3 has a first groove 31 on the outer wall of the side that is close to each other for slidingly inserting the moving frame 4. Each cantilever 3 has a first positioning motor 32 installed on the end arm. Each first positioning motor 32 has a first screw 321 extending into the first groove 31 installed on the main shaft of the first positioning motor 32. Each moving frame 4 is fitted onto the outer wall of the first screw 321 on the same side by threads. Each moving frame 4 has a second groove 41 on the outer wall for slidingly inserting the beam locking block 43.

[0033] It should be noted that the first linear motor group 11 and the second positioning motor 42 can be controlled by an external operating system not marked in the figure. In the initial state, the two inclined beam blocks 2 are close to each other. After the two inclined beams are placed into the inclined beam blocks 2, the two inclined beams are parallel. The bolt hole spacing on the crossbeam is input into the external operating system, so that the first linear motor group 11 drives the two inclined beam blocks 2 to move the two inclined beams away from each other, thereby achieving the effect of automatically moving the inclined beams and adjusting the spacing.

[0034] In the initial state, the two crossbeam blocks 43 are close to each other. The bolt hole spacing on the inclined beam is input into the external operating system, so that the second positioning motor 42 drives the two crossbeam blocks 43 to move the two crossbeams away from each other, thereby achieving the effect of automatically moving the crossbeams and adjusting the spacing.

[0035] The second linear motor unit 12 can drive the cantilever arms 3 on both sides to move closer to each other. The cantilever arms 3 drive the crossbeam clamping block 43 to abut against the end of the crossbeam, thereby achieving the effect of clamping the crossbeam. Since the cantilever arms 3 are symmetrically distributed on both sides of a pair of inclined beam clamping blocks 2, during the clamping process, the positioning work of the crossbeam perpendicular to the inclined beam can be automatically completed with the inclined beam as the reference. Subsequently, the positioning of the crossbeam parallel to the inclined beam can be completed by the first positioning motor 32 to achieve the alignment of the bolt holes. Furthermore, the device uses four sets of independent motors to drive the positioning, which enables the device to assemble brackets of different sizes and specifications, improving the practicality of the device.

[0036] The first positioning motor 32 drives the moving frame 4 to move, causing the moving frame 4 to slide the two crossbeam locking blocks 43 in a direction parallel to the inclined beam. This causes the crossbeam locking blocks 43 to move the crossbeam accordingly, thereby allowing the bolt holes on the crossbeam to be moved to align with the bolt holes on the inclined beam. This achieves the positioning effect of the bolt holes, avoids the need for manual movement, and improves work efficiency.

[0037] See Figures 5 to 6As shown, the fastening mechanism includes a first slide block 5 and a second slide block 6. A pair of first slide rods 21 are welded to the outer wall of each inclined beam block 2, and a pair of second slide rods 44 are welded to the outer wall of each crossbeam block 43. A second slide block 6 is slidably fitted onto the outer walls of the first slide rods 21 and second slide rods 44 located above the inclined beam block 2. A nut slot 51 is provided on the outer wall of the first slide block 5. An electric wrench 62 for tightening bolts is installed on the outer wall of the second slide block 6. A pair of first slide rods 21 perpendicular to the direction of movement of the inclined beam block 2 are welded to the upper and lower outer walls of each inclined beam block 2, and a pair of second slide rods 44 perpendicular to the direction of movement of the crossbeam block 43 are welded to the upper and lower outer walls of each crossbeam block 43. The first slide rods 21 and second slide rods 44 are perpendicular to each other in space. Each of the first slide rods 21 and second slide rods 44 located above the inclined beam block 2... A pair of first slide blocks 5 are slidably fitted on the outer wall of the first slide rod 21 below the beam block 2. Each pair of first slide blocks 5 is slidably fitted on the outer wall of the second slide rod 44 on the same side as the first slide rod 21. A pair of second slide blocks 6 are slidably fitted on the outer wall of the first slide rod 21 above the inclined beam block 2. Each pair of second slide blocks 6 is slidably fitted on the outer wall of the second slide rod 44 on the same side as the first slide rod 21. A pair of guide rods 52 are provided on the outer wall of the first slide block 5 on the side away from the inclined beam block 2, and are slidably inserted into the outer wall of the first slide block 5 near the inclined beam block 2. The distance between the pair of guide rods 52 is greater than the diameter of the bolt and less than the outer tangent circle diameter of the nut. An electric push rod 61 is installed on the outer wall of each second slide block 6, and an electric wrench 62 is fixed on the outer wall of the output end of each electric push rod 61.

[0038] It should be noted that when the two inclined beam blocks 2 move away from each other, the inclined beam blocks 2 drive the first sliding rods 21 on both sides to move, so that the first sliding rods 21 drive the first sliding block 5 and the second sliding block 6 to slide horizontally and equidistantly. Similarly, when the cross beam blocks 43 move away from each other, the cross beam blocks 43 drive the second sliding rods 44 on both sides to move, so that the second sliding rods 44 drive the first sliding block 5 and the second sliding block 6 to slide horizontally and vertically and equidistantly, thereby achieving a cross positioning effect. When the bolt holes are aligned, the first sliding block 5 and the second sliding block 6 can be aligned with the bolt holes. After the bolt holes are aligned, the electric push rod 61 is extended, so that the electric wrench 62 moves down, so that the bolt pre-installed in the socket on the electric wrench 62 is inserted into the bolt hole. The electric wrench 62 is activated to achieve the effect of automatically tightening the bolt and the nut on the nut slot 51. This device can tighten multiple sets of bolts at the same time, improving work efficiency.

[0039] After assembly, the cantilever 3 is moved away from each other by the second linear motor group 12, so that the crossbeam clamp 43 is separated from the crossbeam. At this time, the assembled bracket is pulled from one side of the receiving platform 13, so that the inclined beam slides out from the opening of the inclined beam clamp 2. When the nut slides out from the nut groove 51 on the first slide block 5, the bolt can slide along the guide rod 52 to the receiving platform 13, achieving the effect of rapid material unloading.

[0040] The present invention also provides a process for assembling a solar photovoltaic cell support module, comprising the following steps:

[0041] S1: Place the inclined beam in the inclined beam clamp 2 and the horizontal beam in the horizontal beam clamp 43.

[0042] S2: Start the first linear motor group 11 to drive the two inclined beam blocks 2 to move away from each other;

[0043] S3: Start the second positioning motor 42 to drive the two crossbeam blocks 43 to move away from each other;

[0044] S4: When the bolt holes are aligned, the electric push rod 61 is extended, causing the electric wrench 62 to move down, so that the bolt pre-installed in the socket on the electric wrench 62 is inserted into the bolt hole.

[0045] Working principle: During operation, the inclined beam is placed in the inclined beam clamp 2 and the horizontal beam is placed in the horizontal beam clamp 43.

[0046] The positioning mechanism drives the two inclined beam clamping blocks 2 away from each other, causing the bolt holes on the inclined beams to move horizontally to the same distance as the bolt holes on the crossbeams. The second linear motor unit 12 then drives the two cantilever arms 3 closer together, causing the two cantilever arms 3 to move the two moving frames 4 closer together. The two moving frames 4 then move the two pairs of crossbeam clamping blocks 43 closer together, allowing the crossbeam clamping blocks 43 to clamp the crossbeams. Because the cantilever arms 3 are symmetrically distributed on both sides of a pair of inclined beam clamping blocks 2, the clamping process automatically aligns the crossbeams perpendicular to the inclined beams. The positioning work in the direction is completed by the first positioning motor 32 to position the crossbeam parallel to the inclined beam, thereby aligning the bolt holes. The second positioning motor 42 drives the two crossbeam locking blocks 43 to move away from each other, thereby adjusting the distance between the crossbeams. Then, the first positioning motor 32 causes the moving frame 4 to move the two crossbeam locking blocks 43 as a whole, so that the bolt holes on the crossbeam are aligned with the bolt holes on the inclined beam. This avoids the effect of manual movement and improves work efficiency. In addition, the device uses four sets of independent motors to drive positioning, which enables the device to assemble brackets of different sizes and specifications, improving the practicality of the device.

[0047] By using the fastening mechanism, this device achieves a cross-positioning effect through the first slide rod 21 and the second slide rod 44. When the bolt holes are aligned, the first slide block 5 and the second slide block 6 can be aligned with the bolt holes. After the bolt holes are aligned, the electric push rod 61 is extended, causing the electric wrench 62 to move down. This allows the bolt pre-installed in the socket on the electric wrench 62 to be inserted into the bolt hole. The electric wrench 62 is then activated, achieving the effect of automatically tightening the bolt and the nut on the nut slot 51. This device can simultaneously tighten multiple sets of bolts, improving work efficiency.

[0048] After the bracket is assembled, the solar photovoltaic cells are fixed to the bracket using solar photovoltaic cell installation equipment on the factory assembly line. Then, the bracket and photovoltaic cells can be transported to the site for installation, which greatly reduces the assembly steps required on the construction site and improves construction efficiency.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A solar photovoltaic cell support assembly equipment, comprising a machine tool (1), characterized in that: a first linear motor set (11) and a second linear motor set (12) are installed on the top outer wall of the machine tool (1), and a positioning mechanism and a fastening mechanism are arranged on the machine tool (1); the positioning mechanism comprises a pair of inclined beam clamping blocks (2) and a pair of cross beam clamping blocks (43), the pair of inclined beam clamping blocks (2) are fixed on the outer walls of the two output ends of the first linear motor set (11), when the inclined beam spacing is adjusted, the first linear motor set (11) drives the two inclined beam clamping blocks (2) to slide reversely, a pair of cantilevers (3) symmetrically distributed on both sides of the pair of inclined beam clamping blocks (2) are fixed on the output end of the second linear motor set (12), the outer wall of the side of the two cantilevers (3) close to each other is slidably inserted with a moving frame (4), a pair of cross beam clamping blocks (43) are slidably inserted on the outer wall of each moving frame (4), a second positioning motor (42) is fixed on the outer wall of the moving frame (4), a second screw rod (421) is installed on the main shaft of the second positioning motor (42), a pair of cross beam clamping blocks (43) are threadedly matched and sleeved on the outer wall of the second screw rod (421) with opposite rotation directions, when the cross beam spacing is adjusted, the second positioning motor (42) drives the two cross beam clamping blocks (43) to slide reversely, the outer wall of the side of each cantilever (3) close to each other is provided with a first sliding groove (31) for slidably inserting the moving frame (4), a first positioning motor (32) is installed on the end arm of each cantilever (3), a first screw rod (321) extending into the first sliding groove (31) is installed on the main shaft of each first positioning motor (32), and each moving frame (4) is threadedly matched and sleeved on the outer wall of the same side first screw rod (321). The fastening mechanism comprises a first sliding seat (5) and a second sliding seat (6), a pair of first sliding rods (21) are welded on the outer wall of each inclined beam clamping block (2), a pair of second sliding rods (44) are welded on the outer wall of each cross beam clamping block (43), the outer wall of the first sliding rod (21) and the second sliding rod (44) above the inclined beam clamping block (2) is slidably sleeved with the second sliding seat (6), the outer wall of the first sliding seat (5) is provided with a nut clamping groove (51), the outer wall of the second sliding seat (6) is provided with an electric wrench (62) for tightening the bolt, a pair of first sliding rods (21) perpendicular to the movement direction of the inclined beam clamping block (2) are welded on the upper and lower outer walls of each inclined beam clamping block (2), a pair of second sliding rods (44) perpendicular to the movement direction of the cross beam clamping block (43) are welded on the upper and lower outer walls of each cross beam clamping block (43), the first sliding rod (21) and the second sliding rod (44) are out-of-plane perpendicular in space, wherein the outer wall of each first sliding rod (21) below the inclined beam clamping block (2) is slidably sleeved with a pair of first sliding seats (5), each pair of first sliding seats (5) is slidably sleeved on the outer wall of the second sliding rod (44) on the same side of the first sliding rod (21), the outer wall of each first sliding rod (21) above the inclined beam clamping block (2) is slidably sleeved with a pair of second sliding seats (6), each pair of second sliding seats (6) is slidably sleeved on the outer wall of the second sliding rod (44) on the same side of the first sliding rod (21), wherein the outer wall of the first sliding seat (5) away from the inclined beam clamping block (2) is provided with a pair of guide rods (52) slidably inserted into the outer wall close to the inclined beam clamping block (2), the distance between the pair of guide rods (52) is greater than the diameter of the bolt and less than the diameter of the circumscribed circle of the nut.

2. A solar photovoltaic cell rack assembly apparatus as defined in claim 1, wherein: The outer wall of the machine tool (1) is provided with a receiving table (13).

3. A solar photovoltaic cell rack assembly apparatus as defined in claim 1, wherein: The outer wall of each moving frame (4) is provided with a second sliding groove (41) for slidably inserting the cross beam clamping block (43).

4. The apparatus of claim 1, wherein: The outer wall of each second sliding seat (6) is provided with an electric push rod (61), and the output end of each electric push rod (61) is fixed with an electric wrench (62).

5. A process for assembling a solar photovoltaic cell holder assembly, applied to a solar photovoltaic cell holder assembly assembling apparatus according to any one of claims 1 to 4, characterized in that The method comprises the following steps: S1: placing the inclined beam in the inclined beam clamping block (2) and placing the cross beam in the cross beam clamping block (43); S2: starting the first linear motor set (11) to drive the two inclined beam clamping blocks (2) away from each other; S3: starting the second positioning motor (42) to drive the two cross beam clamping blocks (43) away from each other; S4: when the bolt holes are aligned, control the electric push rod (61) to extend, so that the electric wrench (62) moves downward, so that the bolt pre-installed in the sleeve on the electric wrench (62) is inserted into the bolt hole.

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