A bolt tightening gripper

Abstract

The application discloses a bolt tightening gripper, which comprises a shell, a threaded sleeve and a first sleeve. The threaded sleeve is vertically arranged and rotatably arranged in the shell and is in transmission connection with a rotating assembly arranged on the shell. The first sleeve and the second sleeve are both vertically arranged and are arranged in an upper-lower interval below the threaded sleeve. The first sleeve and the second sleeve are in rotational connection. The upper end of the first sleeve is provided with an annular groove. The upper end of the first sleeve is provided with an external thread and is in threaded connection with the threaded sleeve. A limiting block is arranged in the shell. A non-cylindrical limiting hole is vertically arranged on the limiting block. A protruding part corresponding to the limiting hole is arranged on the first sleeve. The protruding part penetrates through the limiting hole and is in up-down slidable connection with the limiting hole. An elastic assembly is arranged in the shell. A mechanical gripper assembly is rotatably arranged at the bottom end of the reverse shell. The bolt is effectively gripped by the mechanical gripper. The device is placed under the action of the first sleeve to avoid the occurrence of thread damage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bolt using, in particular to a bolt tightening gripper. BACKGROUND

[0002] In the current industrial bolt tightening process, due to the thread hole in the casting or mechanical thread tapping process, there is a very obvious and effective mechanical processing offset behavior, such as the offset of the central axis, the theoretical central axis and the actual central axis has a certain angle inclination, then in the process of automatic tightening of the bolt based on the robot, the bolt will be obviously stuck, the bolt is difficult to tighten into the thread hole, and the robot will forcibly implement high-strength torque, which will cause damage to the internal and external threads, thereby generating stress energy, which will have adverse consequences on the sealing of the thread combination. SUMMARY

[0003] I. Invention purpose

[0004] To solve the technical problems in the background art, the present application provides a bolt tightening gripper, which effectively grips the bolt through the mechanical gripper, and the device can effectively pre-tighten the bolt under the action of the first sleeve, effectively prevent the non-coaxiality and certain offset angle between the central axis of the bolt and the thread hole central axis in the process of bolt tightening, and prevent the damage to the thread.

[0005] II. Technical scheme

[0006] The present application provides a bolt tightening gripper, which comprises an outer shell, a threaded sleeve, a first sleeve and a second sleeve, the threaded sleeve is vertically arranged and rotatably arranged in the outer shell, and is in transmission connection with a rotating assembly arranged on the outer shell, the first sleeve and the second sleeve are vertically arranged and arranged in the lower part of the threaded sleeve with a certain interval, the first sleeve and the second sleeve are in rotational connection, the upper end of the first sleeve is provided with an annular groove, the upper end of the first sleeve is provided with an external thread, and is in threaded connection with the threaded sleeve, a limiting block is arranged in the outer shell, a non-cylindrical limiting hole is vertically arranged on the limiting block, a protruding part corresponding to the limiting hole is arranged on the first sleeve, the protruding part penetrates through the limiting hole and is in up-down slidable connection with the limiting hole, the external thread and the protruding part are located at the upper and lower ends of the annular groove respectively, an elastic assembly is arranged in the outer shell, the elastic assembly is in abutment with the first sleeve, a mechanical gripper assembly is rotatably arranged at the bottom end of the outer shell, and the mechanical gripper assembly is in transmission connection with the second sleeve.

[0007] Preferably, the rotating assembly comprises a torque gun, the torque gun is vertically arranged above the outer shell, the output end of the torque gun extends into the outer shell and is coaxially connected with the threaded sleeve, and the torque gun is connected with the outer shell.

[0008] Preferably, the elastic component includes a first spring, a mounting ring and a first spring seat, the first spring seat is connected to the first sleeve and is located at the lower end of the protrusion, the mounting ring is located in the outer shell and connected thereto, the mounting ring is located below the protrusion, the first spring is sleeved on the first sleeve, one end of which is connected to the mounting ring, and the other end of which abuts against the first spring seat.

[0009] Preferably, the cross-sectional area of ​​the limiting hole is a regular hexagon.

[0010] Preferably, the limiting unit includes a second spring, which is sleeved on the transmission shaft, one end of which is connected to the mounting housing and the other end of which abuts the transmission shaft. A limiting head is provided on the outer circumference of the transmission shaft, and a strip-shaped through hole is provided on the outer circumference of the mounting housing for the limiting head to pass through. A limiting ring is provided at the bottom end of the housing, and the limiting head is located at the bottom end of the limiting ring and abuts against it.

[0011] Preferably, the first sleeve and the second sleeve are rotationally connected via a universal joint.

[0012] Compared with the prior art, the above technical solution of the present invention has the following beneficial technical effects:

[0013] In the present invention: the device can effectively grasp the bolt through a mechanical gripper, and the device can effectively pre-tighten the bolt under the action of the rotational connection between the first sleeve and the second sleeve, effectively preventing the non-coaxiality of the central axis of the bolt and the central axis of the thread hole during the bolt tightening process and the existence of a certain offset angle. If the bolt is tightened forcibly and the pre-tightening link is ignored, damage to the thread will occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Fig. 1 This is a structural schematic diagram of a bolt tightening gripper proposed by the present invention;

[0015] Fig. 2 This is a schematic diagram of the internal structure of a bolt tightening gripper proposed by the present invention;

[0016] Fig. 3 This is a schematic diagram of the structure of a partially enlarged portion A in a bolt tightening gripper proposed by the present invention.

[0017] Figure numerals: 1. housing; 2. torque gun; 3. threaded sleeve; 4. first sleeve; 5. first spring; 6. transmission shaft; 7. mounting shell; 8. manipulator; 9. second sleeve; 10. first spring seat; 11. second spring; 12. limiting ring; 13. limiting rod. DETAILED DESCRIPTION

[0018] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the specific embodiments and drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of well-known structures and techniques is omitted to avoid unnecessary confusion of the concept of the present application.

[0019] In the description of the application, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0020] In the description of the application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connected" and the like should be understood broadly, for example, "connected" can be fixedly connected, welded, riveted, bonded, etc., or can be detachably connected, such as threaded connection, key connection, pin connection, etc., or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] As Figs. 1-3As shown, the bolt tightening gripper provided by the present application comprises a housing 1, a threaded sleeve 3 and a first sleeve 4, the threaded sleeve 3 is vertically arranged and rotatably arranged in the housing 1 and is in transmission connection with a rotating assembly arranged on the housing 1, the first sleeve 4 and the second sleeve 9 are both vertically arranged and arranged in an upper and lower interval below the threaded sleeve 3, the first sleeve 4 and the second sleeve 9 are in rotational connection, the upper end of the first sleeve 4 is provided with an annular groove, the upper end of the first sleeve 4 is provided with an external thread and is in threaded connection with the threaded sleeve 3, a limiting block is arranged in the housing 1, a non-cylindrical limiting hole is vertically arranged on the limiting block, a protruding part corresponding to the limiting hole is arranged on the first sleeve 4, the protruding part penetrates through the limiting hole and is in up and down slidable connection with the limiting hole, the external thread and the protruding part are respectively located at the upper and lower ends of the annular groove, an elastic assembly is arranged in the housing 1, the elastic assembly is in abutment with the first sleeve 4, a mechanical gripper assembly is rotatably arranged at the bottom end of the housing 1, the mechanical gripper assembly is in transmission connection with the second sleeve 9, wherein the rotational connection between the first sleeve 4 and the second sleeve 9 can be achieved through a universal joint, so as to realize the rotational connection of the first sleeve 4 and the second sleeve 9 in a horizontal direction.

[0022] In the application, when the device is used, the threaded sleeve 3 is driven to rotate by the driving assembly. Since the threaded sleeve 3 is threadedly connected with the first sleeve 4, and the protruding part is slidably connected with the limiting hole up and down, the threaded sleeve 3 drives the first sleeve 4 to move downward when rotating, the first sleeve 4 drives the second sleeve 9 to move downward when moving downward, the second sleeve 9 drives the mechanical gripper assembly to fix the bolt when moving downward, and when the threaded sleeve 3 rotates for a period of time, the protruding part moves out of the limiting hole, the annular groove enters the limiting hole, the limiting hole inner wall cannot limit the annular groove, so the rotation of the first sleeve 4 is no longer limited, so that the threaded sleeve 3 directly drives the first sleeve 4 to rotate when rotating, the first sleeve 4 drives the second sleeve 9 to rotate when rotating, so that the mechanical gripper assembly rotates, the mechanical gripper rotates to tighten the bolt, and the device can effectively compensate for the angle deviation of the coaxiality angle of the bolt and the threaded hole under the action of the rotating connection of the first sleeve 4 and the second sleeve 9, so as to effectively prevent the damage of the thread caused by forcibly twisting at a certain angle, and the rotating connection of the first sleeve 4 and the second sleeve 9 can effectively solve the adaptability problem of the central shaft in the tightening process, can be flexibly rotated into, avoids excessive force, effectively protects the thread. When the device needs to loosen the mechanical gripper after tightening the bolt, the threaded sleeve 3 is reversely rotated by the driving assembly, the first sleeve 4 is reversely rotated when the threaded sleeve 3 is reversely rotated, the first sleeve 4 is reversely rotated when the protruding part is reversely rotated to better match the shape of the limiting hole, the protruding part reenters the limiting hole under the action of the elastic assembly, and then the rotation direction of the first sleeve 4 is limited again, so that the first sleeve 4 moves upward when the threaded sleeve 3 reversely rotates, that is, the second sleeve 9 and the mechanical gripper assembly connected with the second sleeve 9 move upward, and the mechanical gripper assembly loosens the tightening of the bolt. The device can effectively tighten the bolt by the mechanical gripper, and the device can effectively pre-tighten the bolt under the action of the rotating connection of the first sleeve 4 and the second sleeve 9, effectively prevent the non-coaxiality of the central axis of the bolt and the central axis of the thread hole during the tightening of the bolt, and there is a certain offset angle. If the pre-tightening link is ignored, the thread will be damaged.

[0023] In an optional embodiment, the rotating assembly includes a torque gun 2, which is vertically arranged above the shell 1, the output end of which extends into the shell 1 and is coaxially connected with the threaded sleeve 3. The torque gun 2 is connected with the shell 1, and the threaded sleeve 3 can be effectively rotated by the torque gun 2.

[0024] In an alternative embodiment, the elastic assembly comprises a first spring 5, a mounting ring and a first spring seat 10, the first spring seat 10 is connected with the first sleeve 4 and located at the lower end of the protrusion, the mounting ring is located in the shell 1 and connected therewith, the mounting ring is located below the protrusion, the first spring 5 is sleeved on the first sleeve 4, one end of which is connected with the mounting ring and the other end of which is in abutment with the first spring seat 10, when the first sleeve 4 moves downward, the first spring seat 10 is driven to move downward, thereby compressing the first spring 5, and the first spring 5 always gives the first spring seat 10 an upward elastic force, thereby compressing the first sleeve 4 to an upward elastic force, so that when the first sleeve 4 moves to the protrusion matching the regular polygon guiding channel, the first sleeve 4 enters the regular polygon guiding channel under the elastic force of the first spring 5.

[0025] In an alternative embodiment, the guiding channel is a regular hexagon in cross-sectional shape.

[0026] In an alternative embodiment, the limiting unit comprises a second spring 11, the second spring 11 is sleeved on the transmission shaft 6, one end of which is connected with the mounting shell 7 and the other end of which is in abutment with the transmission shaft 6, the outer circumferential surface of the transmission shaft 6 is provided with a limiting head 13, the outer circumferential surface of the mounting shell 7 is provided with a strip-shaped through hole for the limiting head 13 to pass through, and the bottom end of the shell 1 is provided with a limiting ring 12, the limiting head 13 is located at the bottom end of the limiting ring 12 and in abutment therewith.

[0027] In an alternative embodiment, the first sleeve 4 and the second sleeve 9 are connected through a universal joint, when the second sleeve 9 moves upward following the first sleeve 4, the second sleeve 9 moves upward, driving the mounting shell 7 to move upward, thereby driving the plurality of mechanical hands 8 and the transmission shaft 6 to move upward, and the mounting shell 7 enters the shell 1, and when the transmission shaft 6 moves upward, driving the limiting head 13 to enter the shell 1, the limiting head 13 moves upward and is in abutment with the limiting ring 12, thereby realizing the relative downward movement of the limiting head 13 and the mounting shell 7, the relative downward movement of the limiting head 13 and the mounting shell 7 drives the relative downward movement of the transmission shaft 6 and the mounting shell 7, thereby driving the plurality of mechanical hands 8 to rotate and open through the plurality of movable rods, and when the second spring 11 is compressed, the transmission shaft 6 moves downward relative to the mounting shell 7, when it is needed to grip the bolt through the mechanical hands 8, the mounting shell 7 moves downward following the second sleeve 9, thereby driving the transmission shaft 6 and the limiting head 13 to move downward, and the transmission shaft 6 realizes the relative upward movement with the mounting shell 7 under the action of the second spring 11, thereby driving the plurality of mechanical hands 8 to grip the bolt through the movable rods.

[0028] In an alternative embodiment, the first sleeve 4 and the second sleeve 9 are connected by a universal joint, wherein the input of the universal joint is coaxially connected to the first sleeve 4 and the output of the universal joint is coaxially connected to the second sleeve 9.

[0029] It should be understood that the above specific embodiments of the present application are merely illustrative or explanatory, and not restrictive of the present application. Thus, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present application should be included in the scope of protection of the present application. In addition, the appended claims of the present application are intended to cover all variations and modifications falling within the scope and boundary of the appended claims, or equivalents of such scope and boundary.

Claims

1. A bolt tightening gripper, characterized in that: The invention comprises a housing (1), a threaded sleeve (3), a first sleeve (4) and a second sleeve (9), wherein the threaded sleeve (3) is vertically arranged and rotatably arranged in the housing (1) and is transmission-connected to a rotating assembly arranged on the housing (1), the first sleeve (4) and the second sleeve (9) are both vertically arranged and arranged below the threaded sleeve (3) with an interval between the upper and lower parts, the first sleeve (4) and the second sleeve (9) are rotationally connected via a universal joint, and the input end of the universal joint is connected to the first sleeve (4). ) are coaxially connected, the output end of the universal joint is coaxially connected to the second sleeve (9), the upper end of the first sleeve (4) is provided with an annular groove, the upper end of the first sleeve (4) is provided with an external thread and is threadedly connected to the threaded sleeve (3), a limit block is provided in the housing (1), a non-cylindrical limit hole is vertically provided on the limit block, a protrusion corresponding to the limit hole is provided on the first sleeve (4), the protrusion passes through the limit hole and is connected to the limit hole in a manner that it can slide up and down, the external thread and the protrusion are respectively located in the At the upper and lower ends of the annular groove, an elastic component is provided in the housing (1), and the elastic component abuts against the first sleeve (4). The bottom end of the housing (1) is rotatably provided with a mechanical gripper component, and the mechanical gripper component is transmission-connected with the second sleeve (9); the mechanical gripper component includes a transmission shaft (6), a mounting shell (7), a plurality of mechanical hands (8) and a second spring (11). The mounting shell (7) is located at the bottom end of the housing (1) and extends into the housing (1). The mounting shell (7) and the second sleeve (9) are Coaxial connection, multiple manipulators (8) are evenly distributed on the circumference of the bottom end of the mounting shell (7), multiple manipulators (8) are rotatably connected to the mounting shell (7), the transmission shaft (6) is vertically arranged in the mounting shell (7) and slidably connected thereto, the outer shell (1) is provided with a limiting unit for limiting the transmission shaft 6, the bottom end of the transmission shaft (6) is movably provided with movable rods equal in number to and corresponding to the multiple manipulators (8), and the multiple movable rods are movably connected to the corresponding manipulators (8).

2. A bolt tightening gripper according to claim 1, characterized in that: The rotating assembly includes a torque gun (2), which is vertically arranged above the housing (1), with its output end extending into the housing (1) and coaxially connected to the threaded sleeve (3), and the torque gun (2) is connected to the housing (1).

3. The bolt tightening gripper according to claim 1, characterized in that: The elastic component comprises a first spring (5), a mounting ring and a first spring seat (10), wherein the first spring seat (10) is connected to the first sleeve (4) and is located at the lower end of the protrusion, the mounting ring is located in the housing (1) and connected thereto, and the mounting ring is located below the protrusion, the first spring (5) is sleeved on the first sleeve (4), one end of the first spring is connected to the mounting ring, and the other end of the first spring seat (10) is in contact with the first spring seat.

4. The bolt tightening gripper according to claim 1, characterized in that: The cross-sectional area of ​​the limiting hole is a regular hexagon.

5. The bolt tightening gripper according to claim 1, characterized in that: The limiting unit includes a second spring (11), which is sleeved on the transmission shaft (6), one end of which is connected to the mounting shell (7), and the other end of which is in contact with the transmission shaft (6). A limiting head (13) is provided on the outer circumference of the transmission shaft (6), and a strip-shaped through hole for the limiting head (13) to pass through is provided on the outer circumference of the mounting shell (7). A limiting ring (12) is provided at the bottom end of the housing (1), and the limiting head (13) is located at the bottom end of the limiting ring (12) and in contact with it.

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