A feeding position correction device and correction method for nut welding parts

Abstract

The present invention discloses a feeding position correction device and correction method for nut weldments, comprising a base, a fixed block, and a cylinder. The fixed block can move up and down, a motor is fixedly mounted on the fixed block, a cylinder is fixedly mounted on the output end of the motor, the cylinder can rotate along its own axis, a rod is slidably connected to the inner wall of the cylinder, the rod can move up and down and can rotate with the cylinder, the upper end of the rod abuts against a spring three, the upper end of the spring three abuts against the upper wall of the cylinder, an outer cylinder is fixedly mounted on the bottom of the fixed block, a sliding sleeve is slidably connected to the inner wall of the outer cylinder, the sliding sleeve can move up and down, the upper end of the sliding sleeve abuts against a spring one, the upper end of the spring one abuts against the bottom surface of the fixed block. The present invention provides a feeding position correction device and correction method for nut weldments, which ensure the consistency of the circumferential position of the nut at the clamping position.

Description

Technical Field

[0001] The present invention relates to the technical field of position correction devices, and more specifically, to a feeding position correction device and correction method for nut welded parts. Background Art

[0002] Currently, stamped parts used in automotive seats require the welding of numerous hexagonal nuts to connect them to other components. This welding operation is fully automated, with nuts delivered to designated locations via a feeder. A robotic arm then picks up the nuts and places them at the weld point of the stamped part for welding. However, since the nuts delivered to these locations vary in circumferential position, the robotic arm cannot always grasp one pair of straight edges. When the robotic arm grasps the nut at the junction of adjacent edges, the grip can become unstable, causing the nut to deviate from its original position, affecting its placement during welding. Severe deviations can even prevent subsequent screw holes from being installed. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a feeding position correction device and correction method for nut weldments to ensure the consistency of the circumferential position of the nut at the clamping position.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a nut welding part feeding position correction device, including a base, a fixed block, and a cylinder, the fixed block can move up and down, the fixed block is fixedly installed with a motor, the motor output end is fixedly installed with a cylinder, the cylinder can rotate along its own axis, the inner wall of the cylinder is slidably connected with a rod body, the rod body can move up and down and can rotate with the cylinder, the upper end of the rod body abuts against a spring three, the upper end of the spring three abuts against the upper wall of the cylinder, the bottom of the fixed block is fixedly installed with an outer cylinder, the inner wall of the outer cylinder is slidably connected with a sliding sleeve, the sliding sleeve can move up and down The upper end of the sliding sleeve is abutted against a spring 1, and the upper end of the spring 1 abuts against the bottom surface of the fixed block; a nut can be placed on the upper end surface of the base, and the nut can be moved and transported along the upper end surface of the base, and the nut can be moved to the bottom of the sliding sleeve, and the nut can be coaxial with the sliding sleeve, and the nut is provided with a screw hole, and the bottom of the rod body can be screwed into the screw hole, and the sliding sleeve is provided with an inner wall, and the cross-sectional size of the inner wall matches the cross-sectional size of the nut, and the sliding sleeve includes a boss located at the bottom, the inner wall of the boss is a cylindrical surface, and the diameter of the cylindrical surface is the same as the diameter of the circumscribed circle of the nut, the inner wall of the boss can be inserted into the nut, and the nut can be inserted into the inner wall to limit the rotation of the nut.

[0005] The present invention is further configured such that a bracket body is installed in a sliding connection at the bottom of the base, the bracket body can move left and right, a cylinder three is fixedly installed on the bracket body, a moving block is installed at the output end of the cylinder three, the moving block can move up and down, the base is provided with a groove body one, the moving block can pass through the groove body one and be inserted into the screw hole, and the moving block can drive the nut to move left and right so that the nut moves to the bottom of the sliding sleeve.

[0006] The present invention is further configured such that the maximum cross-sectional dimension of the moving block is smaller than the inner diameter of the screw hole, one side of the moving block is an arc surface, and the radius of the arc surface is the same as the minimum radius of the screw hole.

[0007] The present invention is further configured to include a limit block, which can move left and right. When the nut moves to the bottom of the sliding sleeve, the limit block is located on the side of the nut's continued moving direction. The inner wall of the limit block can abut the nut to limit the nut. The inner wall of the limit block is an arc shape, and the radius of the arc shape is the same as the radius of the circumscribed circle of the nut.

[0008] The present invention is further configured such that an inner groove 1 is provided on the inner wall of the cylinder, a protrusion corresponding to the inner groove 1 is provided on the outer wall of the rod body, and the protrusion of the rod body is inserted into the inner groove 1.

[0009] The present invention is further configured such that the inner wall of the outer cylinder is provided with an inner groove 2, the sliding sleeve is provided with a convex body, and the convex body is inserted into the inner groove 2.

[0010] The present invention is further configured such that the sliding sleeve is installed with a fixed plate, the fixed plate is slidably connected to a sliding rod, a pressure block is installed at the bottom of the sliding rod, the bottom of the pressure block can abut against the nut, the sliding rod sleeve is provided with a second spring, the upper end of the second spring abuts the fixed plate, and the lower end of the second spring abuts the pressure block.

[0011] The present invention is further configured such that when the inner wall of the boss is sleeved into the nut, the bottom of the pressing block abuts against the nut, and the second spring is compressed.

[0012] The present invention also adopts the following technical solution: a correction method for a nut welding part feeding position correction device, comprising the following steps:

[0013] ① Insert the moving block into the screw hole and push the nut to move under the sliding sleeve. The nut abuts against the inner wall of the limit block to make the sliding sleeve and the nut coaxial;

[0014] ② The outer cylinder moves downward so that the boss is inserted into the nut, and the bottom of the pressure block abuts against the top of the nut. When there is no circumferential misalignment between the inner wall and the nut, the inner wall is directly inserted into the nut. When there is a circumferential misalignment between the inner wall and the nut, the inner wall cannot be directly inserted into the nut. At this time, as the outer cylinder continues to move downward until it abuts against the base, the bottom of the rod abuts against the nut, and as the cylinder moves downward, the spring is compressed.

[0015] ③ The cylinder rotates and drives the rod to rotate, and the rod is screwed into the screw hole. When the inner wall and the nut are misaligned in the circumferential direction, when the rod is just screwed into the screw hole, the rotation of the rod will drive the nut to rotate so that the inner wall can be inserted into the nut. After the inner wall can be inserted into the nut, the inner wall forms a circumferential limit for the nut to facilitate the screwing of the rod;

[0016] ④Rotate the cylinder in reverse to unscrew the screw hole, and the outer cylinder will move upward to separate from the nut.

[0017] In summary, the present invention has the following beneficial effects:

[0018] By adjusting the position of the nut, after the nut is inserted into the inner wall, the circumferential position of the inner wall remains fixed, so that the circumferential position of the nut is adjusted to be consistent with the inner wall, thereby achieving the purpose of maintaining a uniform circumferential position of the nut clamped by the robot, and preventing the situation where the robot clamping position is at the junction of the adjacent edges of the nut, which may cause unstable clamping and lead to position deviation of the nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic cross-sectional view of an embodiment;

[0020] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0021] Figure 3 A schematic diagram of conveying nuts from a top view in the embodiment;

[0022] Figure 4 Schematic diagram of the cross section of the moving block and nut in the embodiment Figure 1 ;

[0023] Figure 5 Schematic diagram of the cross section of the moving block and nut in the embodiment Figure 2 ;

[0024] Figure 6 Schematic cross-section of the limiting block and the nut in the embodiment;

[0025] Figure 7 is a schematic cross-sectional view of the sliding sleeve in the embodiment;

[0026] Figure 8 is a schematic cross-sectional view of a boss in an embodiment;

[0027] Figure 9 It is a schematic diagram of the local action in the embodiment Figure 1 ;

[0028] Figure 10 It is a schematic diagram of the local action in the embodiment Figure 2 .

[0029] Figure numerals: base 1, groove body 11, slide rail 12, cylinder 13, limit block 131, baffle 14, nut 2, screw hole 21, bracket body 3, cylinder 2 31, cylinder 32, moving block 321, connecting seat 4, fixed block 41, motor 42, cylinder body 43, inner groove 1 431, bottom support 44, rod body 45, outer cylinder 46, inner groove 2 461, sliding sleeve 47, protrusion 471, inner wall 472, boss 473, spring 1 48, fixing plate 5, sliding rod 51, pressure block 52, spring 2 53, spring 3 6. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] like Figures 1-10 As shown, this embodiment discloses a nut welding part feeding position correction device, including a base 1, a base 1 is provided with a slot 11, and the slot 11 passes through the base 1 from top to bottom. The upper end surface of the base 1 is provided with a nut 2, and the nut 2 has an outer hexagonal nut. The left side of the upper end surface of the base 1 is connected to the nut 2 conveying track, combined with Figure 1 、 Figure 3 As the nut 2 is continuously transported to the upper end surface of the base 1, the right nut 2 is pushed by the left nut 2 to move on the upper end surface of the base 1.

[0032] like Figure 1 As shown, a slide rail 12 is fixedly mounted on the bottom of the base 1, and the slide rail 12 is slidably connected to the bracket body 3. A second cylinder 31 is also fixedly mounted on the bottom of the base 1. The output of the second cylinder 31 is connected to the bracket body 3, and the bracket body 3 moves left and right under the action of the second cylinder 31. The bracket body 3 is fixedly mounted on the third cylinder 32, and a moving block 321 is mounted on the output end of the third cylinder 32. The moving block 321 can move up and down under the action of the third cylinder 32. The nut 2 is provided with a screw hole 21. The screw hole 21 is a threaded hole. Under the cooperation of the second cylinder 31 and the third cylinder 32, the moving block 321 is inserted into the screw hole 21 and pushes the nut 2 to the right.

[0033] like Figure 4 、 Figure 5 As shown, one side of the moving block 321 is an arc surface, and the radius of the arc surface is the same as the minimum radius of the screw hole 21 . The side arc surface is used to abut against the inner wall of the screw hole 21 to push the nut 2 .

[0034] like Figure 1 、 Figure 3 As shown, the base 1 is slidably connected to a baffle 14, which is driven by a cylinder to move. When the baffle 14 moves toward the side close to the trough body 11, it can limit the nut 2.

[0035] Since the nut 2 delivered to the upper end surface of the base 1 has different circumferential positions ( Figure 3 As shown), Figure 4 、 Figure 5 As shown, by setting the maximum cross-sectional dimension of the moving block 321 to be smaller than the inner diameter of the screw hole 21 , it is possible to ensure that the moving block 321 is inserted into the screw hole 21 .

[0036] like Figure 1 、 Figure 2As shown, the base 1 is also equipped with a cylinder 13, and the output end of the cylinder 13 is fixedly connected to a limit block 131. The limit block 131 can move left and right under the drive of the cylinder 13. The limit block 131 is located on the side of the nut 2 that continues to move (i.e., the right side). The inner wall of the limit block 131 can abut against the nut 2 to limit the nut 2. Specifically, Figure 6 As shown, the inner wall of the stopper 131 is arc-shaped and semicircular, and the radius of the arc is the same as the radius of the circumscribed circle of the nut 2. When the stopper 131 is at the left limit position, the nut 2 moves to abut the inner wall of the stopper 131. Since the radius of the arc of the inner wall of the stopper 131 is the same as the radius of the circumscribed circle of the nut 2, the center position of each nut 2 remains consistent after abutting the inner wall of the stopper 131.

[0037] like Figure 1 、 Figure 2 As shown, the nut welding part feeding position correction device also includes a connecting seat 4, which is moved up and down by a top-connected cylinder. A fixed block 41 is fixedly installed at the bottom of the connecting seat 4, and a motor 42 is fixedly installed on the top of the fixed block 41. The output end of the motor 42 extends downward through the connecting seat 4 and a cylinder 43 is fixedly installed at the bottom. The cylinder 43 can rotate along its own axis under the drive of the motor 42. The cylinder 43 is inserted into the fixed block 41 and is a cylindrical structure. A rod 45 is slidably connected to the inner wall of the cylinder 43. The inner wall of the cylinder 43 is provided with an inner groove 431. The outer wall of the rod 45 is provided with a protrusion corresponding to the inner groove 431. The protrusion of the rod 45 is inserted into the inner groove 431. The rod 45 can move up and down and can rotate with the cylinder 43. The upper end of the rod 45 is abutted against a spring 3 6, and the upper end of the spring 3 6 abuts against the upper wall of the cylinder 43. A base 44 is mounted at the bottom of the barrel 43. The base 44 limits the protrusion of the rod 45 at the lower end, preventing the rod 45 from sliding out of the bottom of the barrel 43. The lower end of the rod 45 extends out of the bottom of the barrel 43 and passes through the base 44. The outer wall of the bottom of the rod 45 is threaded and can be screwed into the screw hole 21 to check whether the screw hole 21 is unobstructed. This check is performed before the nut 2 is welded to the weldment, preventing the operator from discovering that the screw hole 21 is of poor size or the thread is damaged after the nut 2 is welded, thereby reducing subsequent rework.

[0038] like Figure 2 As shown, an outer cylinder 46 is fixedly mounted on the bottom of the fixed block 41. A sliding sleeve 47 is slidably connected to the inner wall of the outer cylinder 46, and the sliding sleeve 47 can move up and down. Projections 471 are provided on both sides of the outer wall of the top of the sliding sleeve 47. The inner wall of the outer cylinder 46 is provided with a second inner groove 461 that matches the projection 471. The upper end of the second inner groove 461 passes through the top of the outer cylinder 46, while the lower end does not pass through the bottom of the outer cylinder 46. The projection 471 is inserted into the second inner groove 461 and can move up and down along the second inner groove 461. At the same time, the projection 471 does not extend downward from the outer cylinder 46. When the limit block 131 is in the left extreme position, the sliding sleeve 47 is coaxial with the limit block 131.

[0039] like Figure 2 As shown, the upper end of the sliding sleeve 47 abuts against a spring 1 48, which in turn abuts against the bottom surface of the fixed block 41. A through-hole extends vertically through the center of the sliding sleeve 47, through which the rod 45 can pass. The nut 2, pushed by the moving block 321, can move below the sliding sleeve 47. The stop block 131 ensures that the nut 2 and the sliding sleeve 47 are coaxial.

[0040] Combine Figure 2 、 Figure 7 、 Figure 8 Sliding sleeve 47 has an inner wall 472 whose cross-sectional dimensions match those of nut 2 and is a regular hexagon. Sliding sleeve 47 includes a boss 473 at its bottom. The inner wall of boss 473 is a cylindrical surface with a diameter equal to the diameter of the circumscribed circle of nut 2. The inner wall of boss 473 is capable of being inserted into nut 2, which can be inserted into inner wall 472 to restrict nut 2 from rotating.

[0041] Since the nut 2 delivered to the upper end surface of the base 1 has different circumferential positions ( Figure 3 (As shown), after the nut 2 is pushed to the right, the circumferential position of the nut 2 must remain consistent when the robot grips it, in order to ensure that the robot grips one of the pair of straight edges of the nut 2 when gripping it at this position. Therefore, by adjusting the position of the nut 2, after the nut 2 is inserted into the inner wall 472, the circumferential position of the inner wall 472 remains fixed, so that the circumferential position of the nut 2 after adjustment is consistent with the inner wall 472, thereby achieving a uniform circumferential position of the nut 2 when gripped by the robot.

[0042] like Figure 2 As shown, a fixed plate 5 is installed on the top of the sliding sleeve 47, the rod body 45 passes through the fixed plate 5, and the fixed plate 5 is slidably connected to a sliding rod 51, which can move up and down. The sliding rod 51 is located on both sides of the fixed plate 5, and the sliding rod 51 is inserted into the sliding sleeve 47. A pressure block 52 is installed at the bottom of the sliding rod 51, and the sliding rod 51 is covered with a spring 2 53. The bottom of the spring 2 53 abuts against the upper end of the pressure block 52, and the top of the spring 2 53 abuts against the fixed plate 5.

[0043] The correction method of the correction device is as follows:

[0044] ① Such as Figure 1 、 Figure 2 As shown, the limit block 131 moves to the left to the extreme position, and the moving block 321 is inserted into the screw hole 21 through the cooperation of cylinder 2 31 and cylinder 3 32 and pushes the nut 2 to move below the sleeve 47. The nut 2 abuts against the inner wall of the limit block 131 to make the sleeve 47 coaxial with the nut 2.

[0045] ② If Figure 2As shown, the outer cylinder 46 moves downward so that the boss 473 is inserted into the nut 2, and the bottom of the pressing block 52 abuts against the top of the nut 2. When the inner wall 472 and the nut 2 are not misaligned in the circumferential direction, the inner wall 472 is directly inserted into the nut 2; when the inner wall 472 and the nut 2 are misaligned in the circumferential direction, the inner wall 472 cannot be directly inserted into the nut 2, as shown in FIG. Figure 9 As shown, at this time, as the outer cylinder 46 continues to move downward until it contacts the base 1, during this process, the spring 1 48 is compressed, and after the bottom of the rod 45 contacts the nut 2, as the cylinder 43 moves downward, the spring 3 6 is compressed. Figure 10 As shown, after the inner wall 472 is inserted into the nut 2, the spring 2 53 is compressed.

[0046] ③ The cylinder 43 rotates under the drive of the motor 42 and drives the rod body 45 to rotate. The rod body 45 is screwed into the screw hole 21 under the action of the spring three 6 and the rotation. After the bottom of the rod body 45 is screwed out of the screw hole 21, the bottom of the rod body 45 is sensed by the sensor to determine whether the screw hole 21 is qualified. When the inner wall 472 and the nut 2 are misaligned in the circumferential direction, when the rod body 45 is just screwed into the screw hole 21, since the pressure of the pressure block 52 on the nut 2 is only an auxiliary force, it is impossible to limit the rotation of the nut 2 in the circumferential direction. Therefore, the rotation of the rod body 45 will drive the nut 2 to rotate so that the inner wall 472 can be inserted into the nut 2. After the inner wall 472 can be inserted into the nut 2, the inner wall 472 forms a circumferential limit on the nut 2 to facilitate the screwing in of the rod body 45.

[0047] ④ The cylinder 43 rotates in the reverse direction to screw out the screw hole 21, and the outer cylinder 46 is separated from the nut 2 upward.

[0048] By aligning the circumferential positions of each nut 2 moved below the sleeve 47, the robot can more accurately grasp one of the straight edges of the nut 2, making the grip more stable. Furthermore, by fully inspecting the screw hole 21 of each nut 2 again, it is possible to prevent the nut 2 from becoming unusable after welding.

[0049] When the entire component is separated from the nut 2 upward, the pressure exerted on the nut 2 by the pressing block 52 prevents the nut 2 from rotating and moving, thereby ensuring the stability of its position.

[0050] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A feeding position correction device for nut welding parts, characterized in that: The invention comprises a base (1), a fixed block (41), and a cylinder (43), wherein the fixed block (41) can move up and down, a motor (42) is fixedly installed on the fixed block (41), the cylinder (43) is fixedly installed on the output end of the motor (42), the cylinder (43) can rotate along its own axis, the inner wall of the cylinder (43) is slidably connected to a rod (45), and the rod (45) can move up and down and can rotate with the cylinder (43). The upper end of the rod body (45) is in contact with a spring three (6), and the upper end of the spring three (6) is in contact with the upper wall of the cylinder body (43). The bottom of the fixed block (41) is fixedly mounted with an outer cylinder (46), and the inner wall of the outer cylinder (46) is slidably connected with a sliding sleeve (47). The sliding sleeve (47) can move up and down, and the upper end of the sliding sleeve (47) is in contact with a spring one (48), and the upper end of the spring one (48) is in contact with the bottom surface of the fixed block (41); The upper end surface of the base (1) can be placed with a nut (2), and the nut (2) can be moved and transported along the upper end surface of the base (1). The nut (2) can be moved to the bottom of the sleeve (47), and the nut (2) can be coaxial with the sleeve (47). The nut (2) is provided with a screw hole (21), and the bottom of the rod body (45) can be screwed into the screw hole (21). The sleeve (47) is provided with an inner wall (472), and the cross-sectional size of the inner wall (472) matches the cross-sectional size of the nut (2). The sleeve (47) includes a boss (473) located at the bottom, and the inner wall of the boss (473) is a cylindrical surface, and the diameter of the cylindrical surface is the same as the diameter of the circumscribed circle of the nut (2). The inner wall of the boss (473) can be inserted into the nut (2), and the nut (2) can be inserted into the inner wall (472) to limit the rotation of the nut (2).

2. A nut welding part feeding position correction device according to claim 1, characterized in that: The bottom of the base (1) is slidably connected to a bracket body (3), the bracket body (3) can move left and right, the bracket body (3) is fixedly installed with a cylinder three (32), the output end of the cylinder three (32) is installed with a moving block (321), the moving block (321) can move up and down, the base (1) is provided with a groove body one (11), the moving block (321) can pass through the groove body one (11) and be inserted into the screw hole (21), the moving block (321) can drive the nut (2) to move when it moves left and right, so that the nut (2) moves to the bottom of the sliding sleeve (47).

3. A nut welding part feeding position correction device according to claim 2, characterized in that: The maximum cross-sectional dimension of the moving block (321) is smaller than the inner diameter of the screw hole (21); one side of the moving block (321) is an arc surface, and the radius of the arc surface is the same as the minimum radius of the screw hole (21).

4. A nut welding part feeding position correction device according to claim 1, characterized in that: The invention also includes a limit block (131), wherein the limit block (131) can move left and right. When the nut (2) moves to the bottom of the sliding sleeve (47), the limit block (131) is located on the side of the nut (2) in the direction of continued movement. The inner wall of the limit block (131) can abut against the nut (2) to limit the position of the nut (2). The inner wall of the limit block (131) is in an arc shape, and the radius of the arc shape is the same as the radius of the circumscribed circle of the nut (2).

5. The feeding position correction device for nut welding parts according to claim 1, characterized in that: The inner wall of the cylinder (43) is provided with an inner groove (431), the outer wall of the rod (45) is provided with a protrusion corresponding to the inner groove (431), and the protrusion of the rod (45) is inserted into the inner groove (431).

6. A nut welding part feeding position correction device according to claim 1, characterized in that: The inner wall of the outer cylinder (46) is provided with an inner groove 2 (461), and the sliding sleeve (47) is provided with a convex body (471), and the convex body (471) is inserted into the inner groove 2 (461).

7. A nut welding part feeding position correction device according to claim 1, characterized in that: The sliding sleeve (47) is provided with a fixed plate (5), the fixed plate (5) is slidably connected to a sliding rod (51), a pressure block (52) is provided at the bottom of the sliding rod (51), the bottom of the pressure block (52) can abut against the nut (2), the sliding rod (51) is provided with a second spring (53), the upper end of the second spring (53) abuts against the fixed plate (5), and the lower end of the second spring (53) abuts against the pressure block (52).

8. A method for correcting the feeding position of a nut welded part according to claim 7, characterized in that: When the inner wall of the boss (473) is inserted into the nut (2), the bottom of the pressing block (52) abuts against the nut (2), and the second spring (53) is compressed.

9. A correction method for a nut welding piece feeding position correction device according to any one of claims 1 to 8, characterized in that: The steps include: ① The moving block (321) is inserted into the screw hole (21) and pushes the nut (2) to move below the sliding sleeve (47), and the nut (2) abuts against the inner wall of the limiting block (131) so that the sliding sleeve (47) and the nut (2) are coaxial; ② The outer cylinder (46) moves downward so that the boss (473) is inserted into the nut 2, and the bottom of the pressure block (52) abuts against the top of the nut (2). When the inner wall (472) and the nut (2) are not misaligned in the circumferential direction, the inner wall (472) is directly inserted into the nut (2); when the inner wall (472) and the nut (2) are misaligned in the circumferential direction, the inner wall (472) cannot be directly inserted into the nut (2). At this time, as the outer cylinder (46) continues to move downward until it abuts against the base (1), the bottom of the rod body (45) abuts against the nut (2), and as the cylinder body (43) moves downward, the spring three (6) is compressed; ③ The cylinder (43) rotates and drives the rod (45) to rotate, and the rod (45) is screwed into the screw hole (21). When the inner wall (472) and the nut (2) are misaligned in the circumferential direction, when the rod (45) is just screwed into the screw hole (21), the rotation of the rod (45) drives the nut (2) to rotate, so that the inner wall (472) can be inserted into the nut (2). After the inner wall (472) can be inserted into the nut 2, the inner wall (472) forms a circumferential limit for the nut (2), so as to facilitate the screwing of the rod (45); ④ The cylinder (43) is rotated in the reverse direction to screw out the screw hole (21), and the outer cylinder (46) is disengaged from the nut (2) upward.

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