Flexible buffering screw screwing device

Abstract

The invention relates to the technical field of screw screwing, in particular to a flexible buffering screw screwing device. Comprising a screwing rod, the screwing rod comprises a driving rod and a driven rod, the driving rod and the driven rod are connected through a flexible structure, the driving rod is installed in an upper bearing seat, two upper bearings for supporting the driving rod are arranged in the upper bearing seat, and the driven rod is installed in a lower bearing seat. Two lower bearings for supporting the driven rod are arranged in the lower bearing seat, and the lower portion of the driven rod is connected with a screwing head through a buffering structure. Flexible connection of the driving rod and the driven rod in the axial direction is achieved, the service life of the screwing tool is prolonged, meanwhile, the situation of excessive screwing cannot occur when a plurality of screws are screwed, and the screws and the screwing tool are protected; the buffering function of the driven rod and the screwing head in the longitudinal direction is achieved, and meanwhile when a plurality of screws are screwed, the pressure of each screw in the longitudinal direction can be ensured so as to ensure that the screws can be tightened.

Description

Technical field:

[0001] The invention relates to the technical field of screw tightening, and in particular to a flexible buffer screw tightening device. Background technology:

[0002] At present, in the process of screwing screws, the existing screwing tools are rigid structures in both the axial direction and the longitudinal direction. The disadvantage of the rigid structure in the axial direction is that when the screw reaches the locking point, the screwing tool is easily affected by the reaction force of the screw if it continues to work, causing impact on the tool itself. Long-term use is likely to affect the service life of the screwing tool, especially if multiple screws are screwed at the same time, because the locking point of each screw is slightly different, when some screws reach the locking point, the other screws have exceeded the locking point, which is easy to cause over-screwing, causing varying degrees of damage to both the screws and the screwing tool; the disadvantage of the rigid structure in the longitudinal direction is that the screwing tool and the screw are in hard contact in the longitudinal direction. If multiple screws are screwed at the same time, because the height of each screw is slightly different, it is difficult for the synchronization of each screwing tool to be completely consistent, and it is easy for individual screws to have low pressure in the longitudinal direction and cannot be tightened, while excessive pressure is easy to cause damage to the screwing tool. In addition, the existing screwing tool can generally only screw a single screw, and cannot screw multiple screws at the same time. There is currently no good solution to the above problems.

[0003] In summary, the above-mentioned problems encountered in the screw tightening process have become technical problems that urgently need to be solved in the industry. Summary of the invention:

[0004] In order to make up for the deficiencies of the prior art, the present invention provides a flexible buffer screw-tightening device, which solves the problem that the previous screwing tools are rigid structures in both axial and longitudinal directions, which easily cause damage to the screwing tools themselves and the screws.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A flexible buffer screw tightening device comprises a screwing rod, which comprises an active rod and a driven rod, wherein the active rod and the driven rod are connected via a flexible structure, the active rod is mounted in an upper bearing seat, two upper bearings for supporting the active rod are provided in the upper bearing seat, the driven rod is mounted in a lower bearing seat, two lower bearings for supporting the driven rod are provided in the lower bearing seat, and the lower part of the driven rod is connected to a screwing head via a buffer structure.

[0007] The flexible structure includes a magnetic coupling.

[0008] A small gear is installed on the top of the active rod.

[0009] There are several small gears, each of which corresponds to a set of screw rods. The small gears are installed in the gear mounting plate along the circumference. A large gear meshing with the several small gears is provided in the center of the gear mounting plate. The center of the large gear is connected to the screwing motor.

[0010] Lubricating grease is stored in the grooves around the large gear and the small gear.

[0011] The active rod is provided with an upper boss and an upper bearing retaining ring for limiting the two upper bearings.

[0012] The driven rod is provided with a lower boss and a lower bearing retaining ring for limiting the two lower bearings.

[0013] The outer sides of the upper bearing seat and the lower bearing seat are respectively provided with mounting flanges.

[0014] The buffer structure includes a movable sleeve installed on the outside of the driven rod, a spring is sleeved on the driven rod between the top of the movable sleeve and the lower boss, long holes are provided in the side walls on both sides of the movable sleeve, and limit pins are installed at the positions of the driven rod corresponding to the long holes, and the two ends of the limit pin are respectively located in the long holes, and the bottom of the movable sleeve is connected to the screwing head.

[0015] The present invention adopts the above scheme and has the following advantages:

[0016] The active rod and the driven rod are connected by a magnetic coupling, which realizes a flexible connection between the active rod and the driven rod in the axial direction, avoids the impact of the reaction force of the screw on the tool itself, prolongs the service life of the screwing tool, and at the same time, there will be no over-tightening when multiple screws are tightened, which protects the screws and the screwing tool; the driven rod is connected to the screwing head by a buffer structure, which realizes the buffer function of the driven rod and the screwing head in the longitudinal direction, can reduce the impact force and play a protective role, and at the same time, when multiple screws are tightened, the pressure in the longitudinal direction of each screw can be ensured to ensure that it is tightened, the screwing motor drives several small gears to rotate synchronously through the large gear, and each small gear drives a set of screwing rods to work, which realizes the function of screwing multiple screws at the same time, and improves work efficiency. Description of the drawings:

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.

[0019] Figure 3 It is a schematic diagram of the driving structure of the present invention.

[0020] In the figure, 1, active rod, 2, driven rod, 3, upper bearing seat, 4, upper bearing, 5, lower bearing seat, 6, lower bearing, 7, screwing head, 8, magnetic coupling, 9, small gear, 10, upper boss, 11, upper bearing retaining ring, 12, lower boss, 13, lower bearing retaining ring, 14, mounting flange, 15, movable sleeve, 16, spring, 17, long hole, 18, limit pin, 19, screwing rod, 20, gear mounting plate, 21, large gear, 22, screwing motor. Specific implementation method:

[0021] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0022] like Figure 1-3 As shown, a flexible buffer screw tightening device includes a tightening rod 19, and the tightening rod 19 includes an active rod 1 and a driven rod 2. The active rod 1 and the driven rod 2 are connected by a flexible structure. The active rod 1 is installed in an upper bearing seat 3, and the upper bearing seat 3 is provided with two upper bearings 4 for supporting the active rod 1. The driven rod 2 is installed in a lower bearing seat 5, and the lower bearing seat 5 is provided with two lower bearings 6 for supporting the driven rod 2. The lower part of the driven rod 2 is connected to a tightening head 7 through a buffer structure.

[0023] The flexible structure includes a magnetic coupling 8. The magnetic coupling 8 is a non-contact coupling, which consists of two inner and outer magnets, separated by an isolation cover in the middle, the inner magnet is connected to the driven rod, and the outer magnet is connected to the active rod. The working principle of the magnetic coupling 8 is to use the interaction of magnetic fields to transmit motion and torque without direct contact.

[0024] A pinion gear 9 is installed on the top of the active rod 1, and the pinion gear 9 is used to drive the active rod 1 to rotate.

[0025] There are several pinion gears 9, each of which corresponds to a set of screwing rods 19. The pinion gears 9 are circumferentially mounted in a gear mounting plate 20. A large gear 21 meshing with the several pinion gears 9 is provided at the center of the gear mounting plate 20. The center of the large gear 21 is connected to a screwing motor 22.

[0026] Grease is stored in the grooves around the large gear 9 and the small gear 21 for lubricating the large gear 9 and the small gear 21 .

[0027] The active rod 1 is provided with an upper boss 10 and an upper bearing retaining ring 11 for limiting the two upper bearings 4 .

[0028] The driven rod 2 is provided with a lower boss 12 and a lower bearing retaining ring 13 for limiting the two lower bearings 6 .

[0029] The outer sides of the upper bearing seat 3 and the lower bearing seat 5 are respectively provided with mounting flanges 14 , and the upper bearing seat 3 is fixed to the bottom of the gear mounting plate 20 through the mounting flanges 14 , and the lower bearing seat 5 is fixed to another mounting plate through the mounting flanges 14 .

[0030] The buffer structure includes a movable sleeve 15 installed on the outside of the driven rod 2, a spring 16 is sleeved on the driven rod 2 between the top of the movable sleeve 15 and the lower boss 12, and long holes 17 are provided in the side walls of the movable sleeve 15 on both sides. A limit pin 18 is installed at the position of the driven rod 2 corresponding to the long hole 17, and the two ends of the limit pin 18 are respectively located in the long hole 17. The bottom of the movable sleeve 15 is connected to the screwing head 7. After the movable sleeve 15 compresses the spring 16, a certain displacement can occur between it and the driven rod 2 in the longitudinal direction. The spring 16 plays a buffering role. The limit pin 18 cooperates with the long hole 17 to limit and guide the up and down movement of the movable sleeve 15. At the same time, the driven rod 2 also drives the movable sleeve 15 to rotate through the limit pin 18, and the movable sleeve 15 then drives the screwing head 7 to rotate to screw the screw.

[0031] Working principle:

[0032] During operation, the large gear 21 is driven to rotate by the screwing motor 22, and the large gear 21 drives the small gear 9 to rotate, and the small gear 9 drives the active rod 1 to rotate, and the active rod 1 drives the driven rod 2 to rotate through the magnetic coupling 8, and the driven rod 2 drives the movable sleeve 15 to rotate through the limit pin 18, and the movable sleeve 15 drives the screwing head 7 to rotate, thereby screwing the screw. During the screwing process, the magnetic coupling 8 realizes a flexible connection between the active rod 1 and the driven rod 2 in the axial direction. After exceeding the upper force limit, idling may occur between the active rod 1 and the driven rod 2, thereby avoiding the impact of the reaction force of the screw on the tool itself. At the same time, there will be no over-screwing when multiple screws are screwed, which protects the screws and the screwing tool. The movable sleeve 15 and the spring 16 realize the buffering function of the active rod 1 and the driven rod 2 in the longitudinal direction. After the movable sleeve 15 compresses the spring 16, a certain displacement may occur between the movable sleeve 15 and the driven rod 2 in the longitudinal direction, and the spring 16 plays a buffering role. The limit pin 18 cooperates with the long hole 17 to limit and guide the up and down movement of the movable sleeve 15. When multiple screws are screwed at the same time, the pressure in the longitudinal direction of each screw can be ensured to ensure that it is tightened.

[0033] The above specific implementation manner cannot be used as a limitation on the protection scope of the present invention. For those skilled in the art, any substitution, improvement or change made to the implementation manner of the present invention falls within the protection scope of the present invention.

[0034] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A flexible buffer screw tightening device, characterized in that: It includes a screwing rod, which includes an active rod and a driven rod, and the active rod and the driven rod are connected by a flexible structure. The active rod is installed in an upper bearing seat, and two upper bearings for supporting the active rod are provided in the upper bearing seat. The driven rod is installed in a lower bearing seat, and two lower bearings for supporting the driven rod are provided in the lower bearing seat. The lower part of the driven rod is connected to a screwing head through a buffer structure.

2. A flexible buffer screw tightening device according to claim 1, characterized in that: The flexible structure includes a magnetic coupling.

3. A flexible buffer screw tightening device according to claim 1, characterized in that: A small gear is installed on the top of the active rod.

4. A flexible buffer screw tightening device according to claim 3, characterized in that: There are several small gears, each of which corresponds to a set of screw rods. The small gears are installed in the gear mounting plate along the circumference. A large gear meshing with the several small gears is provided in the center of the gear mounting plate. The center of the large gear is connected to the screwing motor.

5. A flexible buffer screw tightening device according to claim 4, characterized in that: Lubricating grease is stored in the grooves around the large gear and the small gear.

6. A flexible buffer screw tightening device according to claim 1, characterized in that: The active rod is provided with an upper boss and an upper bearing retaining ring for limiting the two upper bearings.

7. A flexible buffer screw tightening device according to claim 1, characterized in that: The driven rod is provided with a lower boss and a lower bearing retaining ring for limiting the two lower bearings.

8. The flexible buffer screw tightening device according to claim 1, characterized in that: The outer sides of the upper bearing seat and the lower bearing seat are respectively provided with mounting flanges.

9. A flexible buffer screw tightening device according to claim 7, characterized in that: The buffer structure includes a movable sleeve installed on the outside of the driven rod, a spring is sleeved on the driven rod between the top of the movable sleeve and the lower boss, long holes are provided in the side walls on both sides of the movable sleeve, and limit pins are installed at the positions of the driven rod corresponding to the long holes, and the two ends of the limit pin are respectively located in the long holes, and the bottom of the movable sleeve is connected to the screwing head.

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