Self-locking gripper of welding fixture

Abstract

The utility model relates to the technical field of welding fixtures, in particular to a self-locking gripper of a welding fixture. The device comprises a rack, a clamping arm and a leveling assembly, a mounting frame is arranged on the rack, and a driving assembly is arranged on the rack and the mounting frame; the two clamping arms are arranged on the mounting frame in a relatively rotating mode, the driving assembly is in driving connection with the two clamping arms, clamping plates are arranged on the two clamping arms in a rotating mode, and anti-slip strips are oppositely arranged on the two clamping plates; the leveling assembly is arranged below the mounting frame and distributed between the two clamping arms. The two clamping arms are driven by the driving assembly to move relative to each other, and the clamping arms drive the rotationally arranged clamping plate to be adjusted according to the width and the inclination angle of the plate, so that the clamping plate is parallel to the plate.

Description

Technical Field

[0001] This utility model relates to the field of welding fixture technology, and in particular to a self-locking gripper for welding fixtures. Background Technology

[0002] During the welding process of the car body, a robotic arm is used to clamp two separate metal plates together with a mechanical gripper and then weld them.

[0003] Chinese Patent CN222553595U discloses a mechanical gripper for vehicle body welding. It provides a mechanical gripper capable of automatically leveling and smoothing metal sheets for vehicle body welding. The mechanical gripper includes a mounting base, a double-row rack, clamping arms, anti-slip strips, and a leveling component. Anti-slip strips are provided on opposite sides of the two clamping arms. A leveling component is located between the mounting base and the double-row rack to automatically push and level the sides of the metal sheets to be welded, enabling precise welding of the leveled and aligned objects. Before clamping and welding the vehicle body metal sheets, the clamping arms and anti-slip strips are controlled to open relative to each other. Through the combined action of rollers, a top block, and a leveling block, the sides and corners of the metal sheets are automatically pushed and leveled, ensuring that the two metal sheets to be welded are completely aligned.

[0004] However, the above technical solution has the following shortcomings: when clamping a thick plate, the contact surface between the clamping arm and the plate is often in line contact, which results in less friction between the clamping arm and the plate, and the plate is easy to fall off between the clamping arms. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a welding fixture self-locking gripper that uses a drive component to drive two clamping arms to move relative to each other, and the clamping arms drive a rotating clamping plate to adjust according to the width and tilt angle of the plate, so that the clamping plate is parallel to the plate.

[0006] The technical solution of this utility model is a self-locking gripper for welding fixtures, comprising: a frame on which a mounting frame is mounted, and a drive assembly on the frame and the mounting frame; two clamping arms rotatably mounted on the mounting frame, the drive assembly being driven to both clamping arms, each clamping arm rotatably mounted with a clamping plate, and anti-slip strips being disposed opposite each other on the two clamping plates; and a leveling assembly disposed below the mounting frame, distributed between the two clamping arms.

[0007] Preferably, the clamping arm includes a turbine portion rotatably mounted on the mounting frame, an arcuate rod portion mounted on the turbine portion, and a reinforcing rib portion mounted on the arcuate rod portion.

[0008] Preferably, the drive assembly includes a motor mounted on a frame, and a worm gear rotatably mounted on the frame and mounting bracket and connected to the output end of the motor; the worm gear meshes with the turbine section.

[0009] Preferably, the leveling assembly includes a storage rack mounted on the mounting frame, two sets of winding assemblies rotatably mounted on the storage rack, and a leveling rack with one at each output end of the two winding assemblies.

[0010] Preferably, the winding assembly includes a storage tube disposed on the storage rack, a connecting belt wound around the storage tube, a drive rod coaxially connected to the storage tube, a return spring disposed on the drive rod and the storage rack, and an anti-abrasion roller rotatably disposed on the storage rack; the connecting belt is connected to the leveling frame.

[0011] Preferably, the frame is detachably provided with two oppositely distributed fixed frames, and the two fixed frames are detachably provided with connecting plates. The fixed frames are fixedly connected to the frame and the connecting plates with bolts and nuts.

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

[0013] When this utility model is in use, the bottom end of the leveling component contacts the plate, and the driving component drives the two clamping arms to move relative to each other until the side of the two clamping plates with anti-slip strips is in contact with the plate. The clamping plates and the plate are in a parallel state, so that multiple anti-slip strips are in contact with the plate and the clamping force applied by the clamping arms to the clamping plates prevents the plate from slipping off the clamping plates. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0015] Figure 2 This is a schematic diagram of the leveling component in an embodiment of the present invention;

[0016] Figure 3 This is a schematic diagram of the structure of the fixing frame in an embodiment of this utility model.

[0017] Reference numerals: 1. Frame; 2. Fixing frame; 21. Fixing frame body; 22. Upper screw; 23. Lower screw; 3. Connecting plate; 4. Motor; 5. Mounting frame; 6. Worm gear; 7. Clamping arm; 71. Turbine; 72. Bow-shaped rod; 73. Reinforcing rib; 8. Clamping plate; 9. Storage rack; 10. Storage cylinder; 11. Anti-wear roller; 12. Leveling frame; 13. Drive rod. Detailed Implementation

[0018] Example 1

[0019] like Figures 1-3As shown in the figure, the welding fixture self-locking gripper proposed in this embodiment includes a frame 1, clamping arms 7 and a leveling assembly. A mounting frame 5 is provided on the frame 1, and a drive assembly is provided on the frame 1 and the mounting frame 5. Two clamping arms 7 are rotatably arranged on the mounting frame 5. The drive assembly is drivenly connected to both clamping arms 7. A clamping plate 8 is rotatably arranged on both clamping arms 7, and anti-slip strips are arranged opposite each other on the two clamping plates 8. The leveling assembly is located below the mounting frame 5 and is distributed between the two clamping arms 7.

[0020] Two opposing fixed frames 2 are detachably mounted on the frame 1. Connecting plates 3 are detachably mounted on the two fixed frames 2. The fixed frames 2 are fixedly connected to the frame 1 and the connecting plates 3 by bolts and nuts. The fixed frame 2 includes a fixed frame body 21, and multiple upper screw parts 22 and lower screw parts 23 are provided at the upper and lower ends of the fixed frame body 21. When using the gripper, the user can connect it to the connecting plate 3 through a robotic arm or other equipment, and then fix it with bolts and nuts to detachably install the gripper onto the robotic arm. Thus, when the gripper needs maintenance, it can be removed from the robotic arm or other equipment and replaced with another gripper, thereby avoiding the impact of gripper maintenance on the working efficiency of the robotic arm.

[0021] In this embodiment, the bottom of the leveling component contacts the plate, and the driving component drives the two clamping arms 7 to move relative to each other until the sides of the two clamping plates 8 with anti-slip strips are in contact with the plate. The clamping plates 8 and the plate are in a parallel state, so that multiple anti-slip strips are in contact with the plate and the clamping force applied by the clamping arms 7 to the clamping plates 8 prevents the plate from slipping off the clamping plates 8.

[0022] Example 2

[0023] like Figure 1 and Figure 2 As shown, this embodiment of the welding fixture self-locking gripper, compared to Embodiment 1, in this embodiment, the gripping arm 7 includes a turbine part 71 rotatably mounted on the mounting frame 5, an arc-shaped rod part 72 mounted on the turbine part 71, and a reinforcing rib part 73 mounted on the arc-shaped rod part 72. The drive assembly includes a motor 4 mounted on the frame 1, and a worm gear 6 rotatably mounted on the frame 1 and the mounting frame 5 and connected to the output end of the motor 4; the worm gear 6 is engaged with the turbine part 71.

[0024] In this embodiment, the motor 4 drives the worm 6 to rotate. The worm 6 engages with the two turbine parts 71 to drive the two clamping arms 7 to move relative to each other or in opposite directions. At the same time, the spiral angle of the worm is smaller than the friction angle of the worm-worm contact, thereby achieving self-locking between the worm 6 and the turbine parts 71. This avoids the reaction force on the clamping arms 7 from increasing the distance between the two clamping plates 8. The shape of the bow-shaped rod part 72 can maximize the rotation angle of the clamping plate 8 and improve the versatility of the equipment.

[0025] Example 3

[0026] like Figure 1 and Figure 2 As shown, this embodiment proposes a self-locking gripper for welding fixtures. Compared to Embodiment 1, in this embodiment, the leveling assembly includes a storage frame 9 mounted on the mounting frame 5, two sets of winding assemblies rotatably mounted on the storage frame 9, and a leveling frame 12 with one at each output end of the two winding assemblies. The winding assembly includes a storage cylinder 10 mounted on the storage frame 9, a connecting belt wound around the storage cylinder 10, a drive rod 13 coaxially connected to the storage cylinder 10, a return spring mounted on the drive rod 13 and the storage frame 9, and an anti-wear roller 11 rotatably mounted on the storage frame 9; the connecting belt is connected to the leveling frame 12.

[0027] In this embodiment, the bottom of the storage rack 9 contacts the board. Then, the user pulls the two leveling racks 12 to contact the two ends of the board. The return spring will drive the two storage cylinders 10 to rotate. The two storage cylinders 10 drive the two leveling racks 12 to move relative to each other through the connecting belt, so that the two leveling racks 12 drive the two sides of the board to move until the board is aligned.

[0028] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A welding fixture self-locking gripper, characterized by, include: A frame (1) is provided with a mounting bracket (5), and a drive assembly is provided on the frame (1) and the mounting bracket (5); Two clamping arms (7) are rotatably arranged on the mounting frame (5). The drive assembly is driven to both clamping arms (7). Each clamping arm (7) is rotatably arranged with a clamping plate (8). Anti-slip strips are arranged opposite each other on the two clamping plates (8). The leveling component is located below the mounting bracket (5) and is distributed between the two clamping arms (7).

2. The self-locking gripper of claim 1, wherein, The clamping arm (7) includes a turbine part (71) rotatably mounted on the mounting frame (5), an arc-shaped rod part (72) mounted on the turbine part (71), and a reinforcing rib part (73) mounted on the arc-shaped rod part (72).

3. The self-locking gripper of claim 2, wherein, The drive assembly includes a motor (4) mounted on a frame (1) and a worm gear (6) rotatably mounted on the frame (1) and the mounting bracket (5) and connected to the output end of the motor (4); the worm gear (6) meshes with the turbine section (71).

4. The self-locking gripper of claim 1, wherein, The leveling assembly includes a storage rack (9) mounted on the mounting frame (5), two sets of winding assemblies rotatably mounted on the storage rack (9), and a leveling frame (12) with one at each of the output ends of the two winding assemblies.

5. The self-locking gripper of claim 4, wherein, The winding assembly includes a winding tube (10) mounted on a winding rack (9), a connecting belt wound on the winding tube (10), a drive rod (13) coaxially connected to the winding tube (10), a return spring mounted on the drive rod (13) and the winding rack (9), and an anti-abrasion roller (11) rotatably mounted on the winding rack (9); the connecting belt is connected to a leveling frame (12).

6. The self-locking gripper of claim 1, wherein, The frame (1) is detachably equipped with two oppositely distributed fixed frames (2), and the two fixed frames (2) are detachably equipped with connecting plates (3). The fixed frames (2) are fixedly connected to the frame (1) and the connecting plates (3) with bolts and nuts.

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