Three-claw positioning and clamping mechanism

Abstract

The utility model discloses a three-claw positioning and clamping mechanism, which relates to the technical field of clamps for welding, and comprises a mounting seat and a driving air cylinder arranged at the bottom of the mounting seat, a telescopic shaft of the driving air cylinder penetrates through the mounting seat, a hinge seat is fixedly arranged at the end part of the telescopic shaft of the driving air cylinder, and the hinge seat is fixedly connected with the mounting seat. Three pressing arms are hinged to the surface of the hinge seat in an annular array mode, and adjustable pressing blocks are arranged on the surfaces of the three pressing arms; and the placing seat is fixedly arranged on the mounting seat. The clamping device has the advantages that the three pressing arms are driven by the linear motion of one air cylinder to do arc motion, so that the three pressing arms can penetrate through the mounting holes of the inner plate to position and clamp a workpiece, the clamping force is uniform, and the problem that multiple air cylinders need to act is solved; due to improper control or air cylinder performance difference, uneven clamping force distribution can be possibly caused, and opening and clamping are inconvenient to achieve through simultaneous driving of one power source.

Description

Technical Field

[0001] The utility model relates to the technical field of welding fixtures, in particular to a three-claw positioning clamping mechanism. Background Art

[0002] When welding body-in-white parts, such as the left and right rear side assemblies, left and right front longitudinal beam assemblies and other products, a method of positioning and clamping through the mounting holes of the inner panel is required. On the automobile welding line, welding fixtures play an important role in the entire welding process.

[0003] Because the workpiece is large and there is a hole in the middle of the workpiece, it needs to be clamped simultaneously near the hole, but multiple cylinders are required. Each cylinder is connected to the pressure arm through a hinge. Improper control or differences in cylinder performance may cause uneven clamping force distribution, making it inconvenient to drive the clamping open at the same time through one power source. Utility Model Content

[0004] The utility model provides a three-grip positioning clamping mechanism, which has the advantage of driving three pressure arms to move in an arc through the linear motion of a cylinder, so that the workpiece can be positioned and clamped through the mounting hole of the inner plate, thereby making the clamping force uniform, so as to solve the problem that multiple cylinders need to be actuated, each cylinder is connected to the pressure arm through a hinge, and uneven clamping force distribution may be caused due to improper control or cylinder performance differences, making it inconvenient to drive the clamping to open at the same time through a power source.

[0005] In order to achieve the purpose of driving the circular motion of three pressure arms through the linear motion of a cylinder so that they can pass through the mounting holes of the inner plate to position and clamp the workpiece, thereby making the clamping force uniform, the utility model provides the following technical solutions: a three-grasp positioning and clamping mechanism, including a mounting seat, and also including: a driving cylinder installed at the bottom of the mounting seat, the telescopic shaft of the driving cylinder passes through the mounting seat, the end of the telescopic shaft of the driving cylinder is fixedly provided with a hinge seat, the surface of the hinge seat is hinged with three pressure arms in a circular array, and the surfaces of the three pressure arms are all provided with adjustable pressure blocks; a placing seat fixedly provided on the mounting seat, the pressure arm is hinged to one side of the placing seat, and the top of the placing seat is adjustably provided with a drag block, and the drag block is used to place the workpiece; a positioning component provided on the mounting seat, and the positioning component is used to position the workpiece.

[0006] As a preferred technical solution of the present utility model, the pressure arm includes a first hinged part, a second hinged part and a clamping part, the first hinged part, the second hinged part and the clamping part are all integrally formed, the first hinged part is hinged to the hinged seat, the second hinged part is hinged to the top side of the placement seat, and the pressure block is connected to the clamping part.

[0007] As a preferred technical solution of the utility model, the pressure block is arranged in a U shape, the pressure block is sleeved on the surface of the clamping part, a first cushion block is arranged between the pressure block and the clamping part, and a fixing bolt threadedly connected to the pressure block is inserted on the surface of the clamping part.

[0008] As an optimal technical solution of the utility model, the drag block is arranged to be convex, the surface of the placement seat is provided with a groove adapted to the drag block, a second pad is arranged between the drag block and the placement seat, and a limiting bolt threadedly connected to the placement seat is inserted on the surface of the drag block.

[0009] As a preferred technical solution of the utility model, a support frame is provided on the side of the mounting seat, a pressure sensor is installed on the surface of the support frame, the pressure sensor is connected to the driving cylinder through a controller, a strip groove is opened on the surface of the support frame, and the surface of the support frame is threadedly connected to the mounting seat through mounting bolts penetrating the strip groove.

[0010] As a preferred technical solution of the utility model, the positioning assembly includes a connecting frame and a positioning pin, and the connecting frame and the positioning pin are adapted to the number of the pressure arms. The connecting frame and the positioning pin are arranged around the mounting seat array, the connecting frame is installed on the side of the mounting seat, and the positioning pin is detachably installed on the surface of the connecting frame.

[0011] As a preferred technical solution of the utility model, the bottom end of the locating pin passes through the connecting frame, a fixing block is fixedly sleeved on the surface of the locating pin, the fixing block is connected to the top of the connecting frame, and a nut is threadedly sleeved on the bottom end of the locating pin, and the nut is connected to the bottom of the connecting frame.

[0012] Compared with the prior art, the utility model provides a three-claw positioning clamping mechanism, which has the following beneficial effects:

[0013] 1. The three-grip positioning clamping mechanism places the workpiece to be welded on the drag block of the placement seat by setting a driving cylinder and three pressure arms. The telescopic shaft of the driving cylinder drives the hinge seat to extend upward, and the hinge seat drives the three pressure arms to move in an arc shape, so that the three pressure arms are in contact with the vicinity of the hole position of the workpiece to clamp and fix the workpiece, achieving the advantage of driving the three pressure arms to move in an arc shape through the linear motion of one cylinder, so that the workpiece can be positioned and clamped through the mounting hole of the inner plate, thereby making the clamping force uniform, so as to solve the problem that multiple cylinders are required to act, each cylinder is connected to the pressure arm by a hinge, and uneven clamping force distribution may be caused due to improper control or cylinder performance differences, and it is not convenient to drive the clamping to open at the same time through one power source.

[0014] 2. The three-claw positioning clamping mechanism places the workpiece to be welded on the drag block of the placement seat by setting the positioning pin. At the same time, the positioning pin will penetrate the positioning hole of the workpiece to position the workpiece to avoid clamping deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is an exploded view of the overall structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the placement seat portion of the utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the pressure arm portion of the utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the positioning pin part of the utility model;

[0020] Figure 6 This is a partial structural diagram of the pressure sensor of the utility model.

[0021] In the figure: 1. mounting seat; 2. driving cylinder; 3. articulated seat; 4. pressing arm; 401. first articulated part; 402. second articulated part; 403. clamping part; 5. pressing block; 6. placing seat; 7. drag block; 8. first cushion block; 9. second cushion block; 10. supporting frame; 11. pressure sensor; 12. connecting frame; 13. positioning pin; 14. fixing block; 15. nut. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-Figure 6 The utility model discloses a three-grip positioning clamping mechanism, comprising a mounting seat (1), and also comprising: a driving cylinder 2 mounted at the bottom of the mounting seat 1, the telescopic shaft of the driving cylinder 2 passes through the mounting seat 1, the end of the telescopic shaft of the driving cylinder 2 is fixedly provided with an articulated seat 3, the surface of the articulated seat 3 is hinged with three pressure arms 4 in a circular array, and the surfaces of the three pressure arms 4 are all provided with adjustable pressure blocks 5; a placement seat 6 fixedly arranged on the mounting seat 1, the pressure arm 4 is hinged to one side of the placement seat 6, and the top of the placement seat 6 is adjustably provided with a drag block 7, and the drag block 7 is used to place a workpiece; a positioning component arranged on the mounting seat 1, and the positioning component is used to position the workpiece.

[0024] Specifically, the pressing arm 4 includes a first hinged portion 401, a second hinged portion 402 and a clamping portion 403. The first hinged portion 401, the second hinged portion 402 and the clamping portion 403 are all integrally formed. The first hinged portion 401 is hinged to the hinged seat 3, the second hinged portion 402 is hinged to the top side of the placement seat 6, and the pressing block 5 is connected to the clamping portion 403.

[0025] In this embodiment, the telescopic shaft of the driving cylinder 2 drives the articulated seat 3 to extend upward, and the articulated seat 3 drives the first articulated portion 401 of the three pressure arms 4 to move upward and rotate around the articulated seat 3. At the same time, the second articulated portion 402 will rotate around the articulated axis on the placement seat 6, so that the clamping portion 403 moves in an arc shape with the second articulated portion 402 as the center, so that the clamping portion 403 contacts the vicinity of the hole position of the workpiece to clamp and fix the workpiece.

[0026] Specifically, the pressing block 5 is set to be U-shaped, and the pressing block 5 is sleeved on the surface of the clamping part 403. A first cushion block 8 is arranged between the pressing block 5 and the clamping part 403. A fixing bolt threadedly connected to the pressing block 5 is inserted on the surface of the clamping part 403.

[0027] In this embodiment, the fixing bolt is turned to disengage the fixing bolt from the pressure block 5, thereby unlocking the pressure block 5, and then the first pad 8 between the pressure block 5 and the clamping portion 403 is taken out and replaced with a first pad 8 of a different thickness, and then the pressure block 5 is installed again through the fixing bolt so that the pressure block 5 abuts against the surface of the first pad 8. By replacing the first pad 8 of different thicknesses, the distance between the pressure block 5 and the drag block 7 can be adjusted, and workpieces of different sizes can be clamped.

[0028] Specifically, the drag block 7 is set to be convex, the surface of the placement seat 6 is provided with a groove adapted to the drag block 7, a second cushion block 9 is provided between the drag block 7 and the placement seat 6, and a limiting bolt threadedly connected to the placement seat 6 is inserted on the surface of the drag block 7.

[0029] In this embodiment, the limit bolt is turned to disengage the limit bolt from the placement seat 6, thereby unlocking the drag block 7, and then the second cushion block 9 between the drag block 7 and the placement seat 6 is removed and replaced with a second cushion block 9 of a different size, so that the distance between the pressure block 5 and the drag block 7 can be further adjusted.

[0030] Specifically, a support frame 10 is provided on the side of the mounting seat 1, and a pressure sensor 11 is installed on the surface of the support frame 10. The pressure sensor 11 is connected to the driving cylinder 2 through a controller. A strip groove is opened on the surface of the support frame 10, and the surface of the support frame 10 is threadedly connected to the mounting seat 1 through mounting bolts penetrating the strip groove.

[0031] In this embodiment, the workpiece to be welded is placed on the drag block 7 of the placement seat 6, and the workpiece will contact the pressure sensor 11. When the pressure arm 4 drives the pressure block 5 to clamp and position the workpiece, pressure will be applied to the workpiece. The pressure sensor 11 detects the pressure of the workpiece to detect whether the workpiece is clamped in place. When it is not clamped in place, the controller will control the telescopic shaft of the driving cylinder 2 to extend to clamp the workpiece in place.

[0032] Specifically, the positioning assembly includes a connecting frame 12 and a positioning pin 13, and the connecting frame 12 and the positioning pin 13 are both adapted to the number of the pressure arms 4. The connecting frame 12 and the positioning pin 13 are arranged in an array around the mounting seat 1, the connecting frame 12 is installed on the side of the mounting seat 1, and the positioning pin 13 is detachably installed on the surface of the connecting frame 12.

[0033] In this embodiment, the workpiece to be welded is placed on the drag block 7 of the placement seat 6, and the positioning pin 13 penetrates the positioning hole of the workpiece to position the workpiece to avoid clamping deviation.

[0034] Specifically, the bottom end of the locating pin 13 passes through the connecting frame 12, a fixing block 14 is fixedly sleeved on the surface of the locating pin 13, the fixing block 14 is connected to the top of the connecting frame 12, and a nut 15 is threadedly sleeved on the bottom end of the locating pin 13, and the nut 15 is connected to the bottom of the connecting frame 12.

[0035] In this embodiment, the locating pin 13 can be replaced according to the size of the locating hole on the workpiece. The nut 15 at the bottom end of the locating pin 13 is unscrewed, and then the locating pin 13 is removed from the connecting frame 12, and the replaced locating pin 13 is inserted into the connecting frame 12 so that the fixing block 14 on the surface of the locating pin 13 contacts the surface of the connecting frame 12, and then the nut 15 is threaded on the bottom end of the locating pin 13 so that the nut 15 contacts the bottom of the connecting frame 12, thereby fixing the locating pin 13 and completing the replacement, so that the locating pin 13 can be adapted to locating holes of different sizes by replacing the locating pin 13.

[0036] The working principle and use process of the utility model are as follows: when in use, when the pressure arm 4 is in the open state, the workpiece to be welded is placed on the drag block 7 of the placement seat 6, so that the three pressure arms 4 pass through the hole in the middle of the workpiece, and at the same time, the positioning pin 13 passes through the positioning hole of the workpiece to position the workpiece, and then the drive cylinder 2 is started by the switch, and the telescopic shaft of the drive cylinder 2 drives the articulated seat 3 to extend upward, and the articulated seat 3 drives the three pressure arms 4 to move at the same time, and the articulated seat 3 drives the first hinged portion 401 of the three pressure arms 4 to move upward and rotate around the articulated seat 3, and at the same time, the second hinged portion 401 of the three pressure arms 4 is moved upward. Part 402 will rotate around the hinged axis on the placement seat 6, causing the clamping part 403 to move in an arc shape with the second hinged part 402 as the center, so that the clamping part 403 contacts the vicinity of the hole position of the workpiece to clamp and fix the workpiece, and then the workpiece is welded. After welding is completed, the telescopic shaft of the driving cylinder 2 is contracted through the switch control, thereby driving the first hinged part 401 to move downward and reverse through the hinged seat 3, and the second hinged part 402 reverses around the hinged axis on the placement seat 6, driving the clamping part 403 to reset, so that the clamping part 403 releases the fixation of the workpiece.

[0037] In summary, the three-grip positioning and clamping mechanism, by setting up a driving cylinder 2 and three pressing arms 4, achieves the advantage of driving the three pressing arms 4 to move in an arc through the linear motion of one cylinder, so that the workpiece can be positioned and clamped through the mounting hole of the inner plate, thereby making the clamping force uniform, in order to solve the problem that multiple cylinders need to be actuated, each cylinder is connected to the pressing arm 4 by a hinge, and uneven clamping force distribution may be caused due to improper control or cylinder performance differences, making it inconvenient to drive the clamping to open at the same time through one power source.

[0038] It should be noted that, in this article, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A three-grip positioning and clamping mechanism, comprising a mounting seat (1), characterized in that: Also includes: A driving cylinder (2) is mounted at the bottom of the mounting seat (1), the telescopic shaft of the driving cylinder (2) passes through the mounting seat (1), an articulated seat (3) is fixedly provided at the end of the telescopic shaft of the driving cylinder (2), three pressing arms (4) are articulated in a circular array on the surface of the articulated seat (3), and adjustable pressing blocks (5) are provided on the surfaces of the three pressing arms (4); A placement seat (6) is fixedly arranged on the mounting seat (1), the pressure arm (4) is hinged to one side of the placement seat (6), and a drag block (7) is adjustably arranged on the top of the placement seat (6), and the drag block (7) is used to place a workpiece; A positioning component is arranged on a mounting seat (1), and is used to position a workpiece.

2. The three-grip positioning and clamping mechanism according to claim 1, characterized in that: The pressure arm (4) comprises a first hinged portion (401), a second hinged portion (402) and a clamping portion (403); the first hinged portion (401), the second hinged portion (402) and the clamping portion (403) are all integrally formed; the first hinged portion (401) is hinged to the hinge seat (3); the second hinged portion (402) is hinged to one side of the top of the placement seat (6); and the pressure block (5) is connected to the clamping portion (403).

3. The three-grip positioning and clamping mechanism according to claim 2, characterized in that: The pressing block (5) is arranged in a U shape, the pressing block (5) is sleeved on the surface of the clamping portion (403), a first cushion block (8) is arranged between the pressing block (5) and the clamping portion (403), and a fixing bolt threadedly connected to the pressing block (5) is inserted into the surface of the clamping portion (403).

4. The three-grip positioning and clamping mechanism according to claim 3, characterized in that: The drag block (7) is arranged in a convex shape, the surface of the placement seat (6) is provided with a groove matched with the drag block (7), a second cushion block (9) is arranged between the drag block (7) and the placement seat (6), and a limiting bolt threadedly connected to the placement seat (6) is inserted on the surface of the drag block (7).

5. The three-grip positioning and clamping mechanism according to claim 1, characterized in that: A support frame (10) is arranged on the side of the mounting seat (1), a pressure sensor (11) is installed on the surface of the support frame (10), the pressure sensor (11) is connected to the driving cylinder (2) through a controller, a strip groove is opened on the surface of the support frame (10), and the surface of the support frame (10) is threadedly connected to the mounting seat (1) through mounting bolts penetrating the strip groove.

6. The three-grip positioning and clamping mechanism according to claim 1, characterized in that: The positioning assembly comprises a connecting frame (12) and a positioning pin (13), wherein the connecting frame (12) and the positioning pin (13) are both adapted to the number of the pressure arms (4), and the connecting frame (12) and the positioning pin (13) are arranged in an array around the mounting seat (1), wherein the connecting frame (12) is mounted on a side of the mounting seat (1), and the positioning pin (13) is detachably mounted on the surface of the connecting frame (12).

7. The three-grip positioning and clamping mechanism according to claim 6, characterized in that: The bottom end of the positioning pin (13) passes through the connecting frame (12); a fixing block (14) is fixedly sleeved on the surface of the positioning pin (13); the fixing block (14) is connected to the top of the connecting frame (12); a nut (15) is threadedly sleeved on the bottom end of the positioning pin (13); and the nut (15) is connected to the bottom of the connecting frame (12).

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