Nut tightening mechanism

Abstract

The utility model discloses a nut tightening mechanism which comprises a first rotating disc and a rotation driving device, the top of the first rotating disc is connected with the output end of the rotation driving device, the bottom of the first rotating disc is connected with a clamp support, a clamping device is installed on the clamp support, and the clamping device is used for clamping nuts of different sizes. The rotation driving device is used for driving the clamping device and the nut to rotate around the center axis of the nut together. According to the nut tightening mechanism, nuts with different sizes are clamped through the clamping device, so that the nut tightening mechanism can tighten the nuts with different diameters on a product, and the universality and the flexibility of the nut tightening mechanism are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical equipment field, especially a nut tightening mechanism. BACKGROUND

[0002] In the process of product assembly, the tightening and loosening operation of nut is the most common action, in the traditional assembly process, usually all workers hold pneumatic wrench to tighten nut or loosen nut one by one, and the assembly efficiency is also relatively low. In order to improve the nut assembly efficiency, the nut tightening mechanism appears in the market at present, so as to realize the mechanical automatic nut tightening.

[0003] For example, the Chinese patent with publication number CN 209424918U discloses a nut tightening special machine, which comprises a control mechanism, a base and a speed reducer, the base is provided with a turntable, the output shaft of the speed reducer is connected with and drives the turntable to rotate, the turntable is formed with a cavity for placing a workpiece, an adjusting oil cylinder is arranged above the turntable, the piston rod of the adjusting oil cylinder is telescopically connected with a torque sensor, the torque sensor is connected with a sliding seat, the sliding seat is connected with a screwing head, and the screwing head is formed with a fixed cavity matched with the nut. Since the size of the fixed cavity cannot be adjusted, when the nut tightening special machine needs to tighten nuts of other sizes, the fixed cavity needs to be replaced, which increases the operation complexity,

[0004] Therefore, the utility model provides a nut tightening mechanism to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model overcomes the technical insufficiency, provides a nut tightening mechanism, through clamping device different size nut, can adapt to the nut tightening of a plurality of different diameters.

[0006] In order to achieve the above object, the utility model adopts the following technical scheme:

[0007] A nut tightening mechanism comprises a first turntable and a rotary drive device, the top of the first turntable is connected with the output end of the rotary drive device, the bottom of the first turntable is connected with a clamp support, the clamp support is installed with a clamping device, the clamping device is used for clamping nuts of different sizes, and the rotary drive device is used for driving the clamping device and the nut to rotate around the center axis of the nut.

[0008] Preferably, the clamp support comprises an upper mounting plate and a lower mounting plate, the upper mounting plate and the lower mounting plate are fixedly connected through a first vertical rod, the upper mounting plate is connected with the first turntable, the clamping device comprises a clamping driving part and a plurality of circumferentially equidistantly distributed clamping fingers, the clamping driving part is located between the upper mounting plate and the lower mounting plate, the top of the clamping driving part is fixedly connected with the upper mounting plate, the bottom of the clamping driving part is provided with an output end, the output end of the clamping driving part is connected with the clamping fingers through a transmission assembly, and the clamping driving part is used to drive the clamping fingers to clamp or release the nut.

[0009] Preferably, the clamping device is a pneumatic clamping jaw, and the clamping driving part is a pneumatic cylinder.

[0010] Preferably, the top of the upper mounting plate is detachably connected with a second turntable, the second turntable is connected with the upper mounting plate through a connecting assembly, the connecting assembly comprises a detachable button arranged on the outer surface of the second turntable, the detachable button is used to press and release the connection between the connecting assembly, and the top of the second turntable is connected with the first turntable through a turntable screw.

[0011] Preferably, the second turntable is connected with the upper mounting plate through two groups of connecting assemblies, the bottom of the second turntable is provided with a button groove and a cover body covering the groove mouth of the button groove, the outer side of the second turntable is provided with a button hole communicating with the button groove, the connecting assembly comprises a second vertical rod and a moving part arranged in the button groove, one end of the moving part is provided with the detachable button, the other end of the moving part is connected with the groove wall of the button groove through a spring, the moving part is provided with a movable gap, the movable gap is provided with a rising wedge-shaped protrusion, the upper part of the second vertical rod is provided with a wedge-shaped recess matched with the rising wedge-shaped protrusion and a pressing protrusion located above the wedge-shaped recess, the lower end of the second vertical rod is fixedly connected with the upper mounting plate, the upper part of the second vertical rod penetrates into the button groove through the cover body, the rising wedge-shaped protrusion is located in the wedge-shaped recess, and the pressing protrusion is pressed on the top of the wedge-shaped protrusion; the detachable button is used to drive the rising wedge-shaped protrusion to be separated from the wedge-shaped recess under pressing.

[0012] Preferably, the turntable screw comprises a screw head, a movable rod part and a threaded rod part from top to bottom in sequence, the threaded rod part is used to be fixedly connected with the top of the second turntable, the first turntable is provided with a movable through hole, the hole diameter of the movable through hole is greater than the diameter of the movable rod part, and the movable rod part penetrates through the movable through hole.

[0013] Preferably, the turntable screw is an equal-height screw.

[0014] Preferably, the rotary driving device comprises a motor, a torque sensor and a speed reducer, the output shaft of the motor is drivingly connected through a first shaft coupling and the torque sensor, the output end of the torque sensor is drivingly connected through a second shaft coupling and the speed reducer, and the output end of the speed reducer is drivingly connected with the top of the first turntable.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] 1. The utility model discloses a clamping device clamps different size nuts, so that the nut tightening mechanism can tighten nuts of different diameters on the product, improve the versatility and flexibility of the nut tightening mechanism.

[0017] 2. The upper mounting plate and the second turntable are detachably connected through the connecting assembly, especially the detachable key design in the connecting assembly, facilitating the disassembly and replacement of the clamping device and the clamp support, when the nuts to be tightened change greatly and the pneumatic clamping jaw needs to be replaced to adapt to the nuts, the pneumatic clamping jaw and the clamp support can be quickly disassembled by pressing the disassembly key, and another size of pneumatic clamping jaw and clamp support are replaced, thereby improving the work efficiency.

[0018] 3. The first turntable and the second turntable are floatingly connected through the turntable screw, and the turntable screw and the movable through hole have a gap, so that the second turntable, the clamp support and the clamping device can float up and down together, and can adapt to the product with height deviation. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the overall schematic view of the nut tightening mechanism of the utility model;

[0020] Figure 2 It is the schematic view of the first turntable, the second turntable and the clamp support connection of the utility model; Figure 1 ;

[0021] Figure 3 It is the schematic view of the first turntable, the second turntable and the clamp support connection of the utility model; Figure 2 ;

[0022] Figure 4 It is the schematic view of the utility model that the moving part and the second vertical rod are in the disconnection state;

[0023] The implementation, functional characteristics and advantages of the utility model will be further described with reference to the drawings in combination with the embodiments. DETAILED DESCRIPTION

[0024] The features and other related features of the utility model will be further described in detail through the embodiments, so as to facilitate the understanding of the technicians in the same industry:

[0025] Referring to Figures 1 to 4 , an embodiment of a nut tightening mechanism of the utility model is proposed:

[0026] The nut tightening mechanism comprises a first rotating disc 1 and a rotating driving device 2. The top of the first rotating disc 1 is connected with the output end of the rotating driving device 2. The bottom of the first rotating disc 1 is connected with a clamp support 3, and the clamp support 3 is provided with a clamping device 4. The rotating driving device 2 is used for driving the clamping device 4 and the nut to rotate around the central axis of the nut. The clamping device 4 is used for clamping nuts of different sizes, so that the nut tightening mechanism can tighten nuts of different diameters onto products, and the versatility and flexibility of the nut tightening mechanism are improved.

[0027] As shown in the drawings, Figure 2 The clamp support 3 comprises an upper mounting plate 31 and a lower mounting plate 32. The upper mounting plate 31 and the lower mounting plate 32 are fixedly connected through a first vertical rod 33, so that there is a gap between the upper mounting plate 31 and the lower mounting plate 32. The upper mounting plate 31 is connected with the first rotating disc 1. The clamping device 4 comprises a clamping driving part 41 and a plurality of circumferentially equidistant clamping fingers 42. The clamping driving part 41 is located between the upper mounting plate 31 and the lower mounting plate 32. The top of the clamping driving part 41 is fixedly connected with the upper mounting plate 31. The bottom of the clamping driving part 41 is provided with an output end. The output end of the clamping driving part 41 is connected with the clamping fingers 42 through a transmission assembly. The lower mounting plate 32 is provided with a clamping jaw through hole 321 for the transmission assembly. The clamping driving part 41 is used for driving the clamping fingers 42 to clamp or release the nut.

[0028] Specifically, the clamping device 4 is a pneumatic clamping jaw, and the clamping driving part 41 is a pneumatic cylinder.

[0029] As shown in the drawings, Figure 2 The top of the upper mounting plate 31 is detachably connected with a second rotating disc 5. The second rotating disc 5 is connected with the upper mounting plate 31 through a connecting assembly. The connecting assembly comprises a detachable button 61 arranged on the outer surface of the second rotating disc 5. The detachable button 61 is used for pressing to release the connection between the connecting assembly, so as to facilitate the disassembly and replacement of the clamping device 4 and the clamp support 3.

[0030] Since the stroke range of the clamping fingers 42 of the pneumatic clamping jaw is 8mm-20mm, when the diameter of the nut to be tightened changes greatly and the original pneumatic clamping jaw cannot adapt to the nut, the pneumatic clamping jaw and the clamp support 3 can be quickly disassembled by pressing the detachable button 61, and another size of pneumatic clamping jaw and clamp support 3 can be replaced, so that the replacement efficiency is high.

[0031] As shown in the drawings, Figure 3 The second rotating disc 5 is connected with the upper mounting plate 31 through two groups of connecting assemblies. The bottom of the second rotating disc 5 is provided with a button groove 51 and a cover body 62 covering the slot of the button groove 51. The groove wall of the button groove 51 is provided with a connecting convex part 511. The cover body 62 is fixedly connected with the connecting convex part 511 through a screw. The cover body 62 is provided with a rod through hole 621.

[0032] The second rotating disc 5 is provided with a button hole in communication with the button groove 51, and the connecting assembly comprises a second vertical rod 63 and a moving part 64 installed in the button groove 51. One end of the moving part 64 is provided with a dismounting button 61, and the dismounting button 61 is arranged to pass through the button groove 51 from the button hole. The other end of the moving part 64 is connected with the groove wall of the button groove 51 through a spring 67. The moving part 64 is provided with a movable gap 65, and the movable gap 65 is provided with a rising wedge-shaped protrusion 66. The second vertical rod 63 is provided with a wedge-shaped recess 631 matched with the rising wedge-shaped protrusion 66 and a pressing protrusion 632 located above the wedge-shaped recess 631.

[0033] As shown in Figure 4 , the second vertical rod 63 is fixedly connected with the upper mounting plate 31, the upper part of the second vertical rod 63 passes through the rod through hole 621 and enters the button groove 51, the rising wedge-shaped protrusion 66 is located in the wedge-shaped recess 631, and the pressing protrusion 632 is pressed on the top of the rising wedge-shaped protrusion 66; the dismounting button 61 is used to drive the rising wedge-shaped protrusion 66 to be separated from the wedge-shaped recess 631 under pressure.

[0034] The working principle of the utility model for replacing the pneumatic clamping jaw is as follows: firstly, two dismounting buttons 61 are pressed at the same time, the dismounting buttons 61 drive the moving part 64 to move together, and under the guidance of the button groove 51, the moving part 64 moves along a horizontal straight line, so that the rising wedge-shaped protrusion 66 is separated from the wedge-shaped recess 631, at this time, the moving part 64 and the second vertical rod 63 are no longer connected, and the staff can move the pneumatic clamping jaw and the clamp support 3 downward together, so that the pneumatic clamping jaw and the clamp support 3 are separated from the second rotating disc 5. Then, another clamp support 3 with a pneumatic clamping jaw fixed thereon is connected with the second rotating disc 5. During the connecting process, the two dismounting buttons 61 are pressed, the second vertical rod 63 of the clamp support 3 is inserted into the movable gap 65, and then the dismounting buttons 61 are released, the restoring force of the spring drives the rising wedge-shaped protrusion 66 to move to the wedge-shaped recess 631, so that the clamp support 3 is fixedly connected with the second rotating disc 5.

[0035] As shown in Figure 3 , the top of the second rotating disc 5 is connected with the first rotating disc 1 through a rotating disc screw 7. The rotating disc screw 7 comprises a screw head 71, a movable rod part 72 and a threaded rod part 73 from top to bottom. The threaded rod part 73 is used to be fixedly connected with the top of the second rotating disc 5, the first rotating disc 1 is provided with a movable through hole 11, and the movable rod part 72 penetrates through the movable through hole 11. The diameter of the movable through hole 11 is larger than the width of the movable rod part 72, so that there is a gap between the movable rod part 72 and the movable through hole 11, so that the second rotating disc 5, the clamp support 3 and the clamping device 4 can float up and down together, and can adapt to the products with height deviation. Moreover, the first rotating disc 1 and the second rotating disc 5 are connected in a floating mode, have the functions of buffering and shock absorption, can make the equipment run stably and prolong the service life of the equipment.

[0036] Specifically, the rotating disc screw 7 is an equal-height screw.

[0037] As shown in Figure 1 The rotating driving device 2 includes a motor 21, a torque sensor 22, a reducer 23, the output shaft of the motor 21 is drivingly connected through a first shaft coupling 24 and the torque sensor 22, the output end of the torque sensor 22 is drivingly connected with the reducer 23 through a second shaft coupling 25, and the output end of the reducer 23 is drivingly connected with the top of the first rotating disc 1.

[0038] The above only is the preferred embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structural transformation, direct or indirect application in other related technical fields by using the content of the present application specification and drawings, are also included in the patent protection range of the present application.

Claims

1. A nut tightening mechanism, characterized in that, It includes a first turntable (1) and a rotary drive device (2). The top of the first turntable (1) is connected to the output end of the rotary drive device (2). The bottom of the first turntable (1) is connected to a clamp bracket (3). A clamping device (4) is installed on the clamp bracket (3). The clamping device (4) is used to clamp nuts of different sizes. The rotary drive device (2) is used to drive the clamping device (4) and the nuts to rotate together around the central axis of the nuts.

2. The nut tightening mechanism according to claim 1, characterized in that, The clamp bracket (3) includes an upper mounting plate (31) and a lower mounting plate (32). The upper mounting plate (31) and the lower mounting plate (32) are fixedly connected by a first vertical rod (33). The upper mounting plate (31) is connected to the first turntable (1). The clamping device (4) includes a clamping drive part (41) and a plurality of circumferentially equidistant clamping fingers (42). The clamping drive part (41) is located between the upper mounting plate (31) and the lower mounting plate (32). The top of the clamping drive part (41) is fixedly connected to the upper mounting plate (31). The bottom of the clamping drive part (41) is provided with an output end. The output end of the clamping drive part (41) is connected to the clamping fingers (42) through a transmission assembly. The clamping drive part (41) is used to drive the clamping fingers (42) to clamp or loosen the nut.

3. The nut tightening mechanism according to claim 2, characterized in that, The clamping device (4) is a pneumatic gripper, and the clamping drive unit (41) is a cylinder.

4. A nut tightening mechanism according to claim 2, characterized in that, The top of the upper mounting plate (31) is detachably connected to a second turntable (5). The second turntable (5) is connected to the upper mounting plate (31) via a connecting component. The connecting component includes a disassembly button (61) on the outer surface of the second turntable (5). The disassembly button (61) is used to press and release the connection between the connecting components. The top of the second turntable (5) is connected to the first turntable (1) via a turntable screw (7).

5. A nut tightening mechanism according to claim 4, characterized in that, The second turntable (5) is connected to the upper mounting plate (31) via two sets of connecting components. The bottom of the second turntable (5) has a button groove (51) and a cover (62) that covers the opening of the button groove (51). The outer side of the second turntable (5) has a button hole communicating with the button groove (51). The connecting components include a second vertical rod (63) and a movable part (64) installed in the button groove (51). One end of the movable part (64) has the disassembly button (61), which passes through the button hole and out of the button groove (51). The other end of the movable part (64) is connected to the groove wall of the button groove (51) via a spring (67). The movable part (64) has an movable notch. 65), the movable notch (65) is provided with a rising wedge-shaped protrusion (66), the upper part of the second vertical rod (63) is provided with a wedge-shaped recess (631) that cooperates with the rising wedge-shaped protrusion (66) and a pressing protrusion (632) located above the wedge-shaped recess (631), the lower end of the second vertical rod (63) is fixedly connected to the upper mounting plate (31), the upper part of the second vertical rod (63) penetrates through the cover (62) and enters the button groove (51), the rising wedge-shaped protrusion (66) is located in the wedge-shaped recess (631), and the pressing protrusion (632) presses on the top of the rising wedge-shaped protrusion (66); the disassembly button (61) is used to drive the rising wedge-shaped protrusion (66) to disengage from the wedge-shaped recess (631) by being pressed.

6. A nut tightening mechanism according to claim 4, characterized in that, The turntable screw (7) includes, from top to bottom, a screw head (71), a movable rod (72), and a threaded rod (73). The threaded rod (73) is used to fix the top of the second turntable (5). The first turntable (1) is provided with a movable through hole (11). The diameter of the movable through hole (11) is larger than the diameter of the movable rod (72). The movable rod (72) passes through the movable through hole (11).

7. A nut tightening mechanism according to claim 6, characterized in that, The turntable screw (7) is a height-equal screw.

8. A nut tightening mechanism according to claim 1, characterized in that, The rotary drive device (2) includes a motor (21), a torque sensor (22), and a reducer (23). The output shaft of the motor (21) is connected to the torque sensor (22) via a first coupling (24). The output end of the torque sensor (22) is connected to the reducer (23) via a second coupling (25). The output end of the reducer (23) is connected to the top of the first turntable (1).

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