Centering clamping device

Abstract

The utility model provides a centering clamping device which is compact in structure and favorable for reducing occupied space, and relates to a clamping device. A centering clamping device comprises a support, a clamping driving cylinder, a left clamping block, a right clamping block, a left swing arm and a right swing arm. A supporting block used for supporting a workpiece is arranged on the support, and the left clamping block and the right clamping block are arranged on the two sides of the supporting block respectively and are oppositely arranged. The left swing arm is arranged on the side, provided with the left clamping block, of the supporting block, the right swing arm is arranged on the side, provided with the right clamping block, of the supporting block, and the left swing arm and the right swing arm are hinged to the support through hinge shafts arranged between the upper ends and the lower ends of the left swing arm and the right swing arm respectively. A gap is formed between the left swing arm and the right swing arm to form a clamping driving cylinder mounting space, and the clamping driving cylinder is inversely mounted in the clamping driving cylinder mounting space. According to the device, the occupied space in the longitudinal direction and the transverse direction is small, and the installation and use requirements in the small space can be better met.

Description

Technical Field

[0001] The utility model relates to a clamping device, in particular to a centering clamping device. Background Art

[0002] During the welding process of the chassis frame longitudinal beam, the upper plate of the longitudinal beam needs to be buckled into the U-shaped lower plate of the longitudinal beam first, and then fixed to the walking track of the welding robot gun head through the centering clamping device. Since the chassis frame longitudinal beam is a profile, its structure is curved and there are many curved parts. In order to prevent the chassis frame longitudinal beam from deforming during the welding process and facilitate the accurate welding of the welding robot arm, clamping devices need to be arranged at different curved parts along the chassis frame longitudinal beam during the welding process. The distance between the clamping devices is relatively close, and considering the arrangement of the welding robot arms on both sides, this puts forward new requirements for the compactness of the structure of the centering clamping device.

[0003] The traditional clamping device includes a left clamp block and a right clamp block that are relatively arranged, and the left clamp block and the right clamp block can be driven by different clamping drive mechanisms or the same clamping drive mechanism. Compared with the clamping device using different drive mechanisms, the left clamp block and the right clamp block use the same clamping drive mechanism, which has a more compact structure, good synchronization, and good centering, and can better ensure the accuracy of the clamping position of the workpiece each time, which is more conducive to welding by the welding robot arm. However, the existing clamping devices in which the left clamp block and the right clamp block use the same clamping drive mechanism all use a screw rod set along the clamping direction to drive the left clamp block and the right clamp block to move and clamp. The structure is not compact enough and occupies a large space, which makes it difficult to meet the use requirements of small installation space such as chassis frame longitudinal beam welding. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a centering clamping device which has a compact structure and is conducive to reducing the occupied space.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a centering clamping device, including a bracket, a clamping drive cylinder, a left clamping block, a right clamping block, and also including a left swing arm for driving the left clamping block to move toward or away from the right clamping block and a right swing arm for driving the right clamping block to move toward or away from the left clamping block;

[0006] The bracket is provided with a support block for supporting the workpiece, and the left clamp block and the right clamp block are respectively arranged on both sides of the support block and are arranged opposite to each other;

[0007] The left swing arm is arranged on a side of the support block where the left clamping block is arranged, and the right swing arm is arranged on a side of the support block where the right clamping block is arranged. The left swing arm and the right swing arm are respectively hingedly connected to the bracket through hinge shafts arranged between the upper and lower ends thereof. A spacing is arranged between the left swing arm and the right swing arm to form a clamping drive cylinder installation space. The clamping drive cylinder is inverted in the clamping drive cylinder installation space so that its piston rod is vertically downward. The lower ends of the left swing arm and the right swing arm are respectively provided with a driving connecting rod with one end hinged thereto, and the other end of the driving connecting rod is hinged to the piston rod of the clamping drive cylinder.

[0008] The left clamping block is installed on the upper end of the left swing arm, and the right clamping block is installed on the upper end of the right swing arm.

[0009] Furthermore, the clamping drive cylinder is a hydraulic cylinder.

[0010] Furthermore, it also includes a sliding block arranged below the clamping drive cylinder and fixedly connected to the piston rod of the clamping drive cylinder, the bracket is provided with a limiting structure which vertically slides with the sliding block to prevent the piston rod of the clamping drive cylinder from rotating, and the driving connecting rod is hinged to the piston rod of the clamping drive cylinder through the sliding block.

[0011] Furthermore, the limiting structure is a square guide rail that vertically slides with the slider.

[0012] Furthermore, the bracket is provided with a height adjustment mechanism connected to the support block for adjusting the height of the support block.

[0013] Furthermore, the height adjustment mechanism includes a screw rod supported and arranged below the support block, the upper end of the screw rod is rotatably connected to the support block, and the lower end of the screw rod is threadedly connected to the bracket through its thread.

[0014] Furthermore, the bracket is provided with a first limit surface cooperating with the left swing arm to limit the movement of the left clamping block toward the right clamping block, and the bracket is also provided with a second limit surface cooperating with the right swing arm to limit the movement of the right clamping block toward the left clamping block.

[0015] Furthermore, the left clamping block is detachably connected to the left swing arm, and the right clamping block is detachably connected to the right swing arm.

[0016] The beneficial effects of the utility model are as follows: the middle clamping device of the utility model arranges the clamping drive cylinder in the clamping drive cylinder installation space between the left swing arm and the right swing arm, utilizes the space between the left swing arm and the right swing arm, and drives the left and right clamping blocks in the manner of driving the left and right swing arms with the clamping drive cylinder. The driving of the clamping drive cylinder is more labor-saving, and a clamping drive cylinder with a smaller cylinder diameter can be used, so that it is convenient to set it in the space between the left swing arm and the right swing arm. The structure of the entire device is more compact, and the device can occupy less space both longitudinally and transversely, which can better meet the installation and use requirements in a smaller space. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the utility model;

[0018] Figure 2 It is a front view of the utility model;

[0019] Figure 3 It is a cross-sectional structural diagram of the utility model;

[0020] Figure 4 yes Figure 2 A magnified image of point A;

[0021] As shown in the figure: bracket 1, support block 2, left clamping block 3, right clamping block 4, clamping drive cylinder 5, left swing arm 6, right swing arm 7, hinge shaft 8, square guide rail 9, drive connecting rod 10, slider 11, screw 12, first limit surface 13, second limit surface 14, clamping drive cylinder installation space 15. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] like Figure 1 , Figure 2As shown, a centering clamping device of the utility model comprises a bracket 1, a clamping drive cylinder 5, a left clamping block 3, a right clamping block 4, and also comprises a left swing arm 6 for driving the left clamping block 3 to move toward or away from the right clamping block 4 and a right swing arm 7 for driving the right clamping block 4 to move toward or away from the left clamping block 3. The bracket 1 is provided with a support block 2 for supporting a workpiece, and the left clamping block 3 and the right clamping block 4 are respectively arranged on both sides of the support block 2 and are arranged opposite to each other. The left swing arm 6 is arranged on the side of the support block 2 where the left clamp block 3 is arranged, and the right swing arm 7 is arranged on the side of the support block 2 where the right clamp block 4 is arranged. The left swing arm 6 and the right swing arm 7 are respectively hingedly connected to the bracket 1 through the hinge shaft 8 arranged between the upper and lower ends thereof. A spacing is arranged between the left swing arm 6 and the right swing arm 7 to form a clamping drive cylinder installation space 15. The clamping drive cylinder 5 is inverted in the clamping drive cylinder installation space 15 so that its piston rod is vertically downward. The lower ends of the left swing arm 6 and the right swing arm 7 are respectively provided with a driving connecting rod 10 with one end hinged thereto to drive it to rotate around its hinge shaft 8, and the other end of the driving connecting rod 10 is hinged to the piston rod of the clamping drive cylinder 5. The left clamp block 3 is installed at the upper end of the left swing arm 6, and the right clamp block 4 is installed at the upper end of the right swing arm 7.

[0024] When the centering clamping device is working, the workpiece is placed on the support block 2, and the support block 2 supports the workpiece. When clamping, the clamping drive cylinder 5 is started, and the clamping drive cylinder 5 moves its piston rod to extend, and the piston rod first drives the driving connecting rod 10 of the left swing arm 6 and the right swing arm 7 to move, and the driving connecting rod 10 then drives the left swing arm 6 and the right swing arm 7 respectively, so that the left swing arm 6 and the right swing arm 7 rotate around their hinge shafts 8 respectively, so that the left clamp block 3 and the right clamp block 4 move synchronously towards each other, so that the distance between the two becomes smaller, and then the workpiece is clamped and fixed in the middle position of the two clamp blocks. When releasing the workpiece, the clamping drive cylinder 5 moves in the opposite direction, so that the left clamp block 3 and the right clamp block 4 can move synchronously away from each other, and the workpiece can be released. The middle clamping device of the utility model arranges the clamping drive cylinder in the clamping drive cylinder installation space 15 between the left swing arm 6 and the right swing arm 7, utilizes the space between the left swing arm 6 and the right swing arm 7, and drives the left and right clamping blocks in the manner of driving the left and right swing arms with the clamping drive cylinder. The driving of the clamping drive cylinder is more labor-saving, and a clamping drive cylinder with a smaller cylinder diameter can be used, so that it is convenient to set it in the space between the left swing arm 6 and the right swing arm 7. Therefore, the structure of the entire device is more compact, the space occupied by the device in the longitudinal and lateral directions can be reduced, and it can better meet the installation and use requirements in a smaller space.

[0025] The clamping drive cylinder 5 can specifically be a hydraulic cylinder, a pneumatic cylinder, etc. In the embodiment of the utility model, the clamping drive cylinder 5 is a hydraulic cylinder.

[0026] The driving connecting rod 10 can be hinged to the piston rod of the clamping driving cylinder 5 directly or indirectly through other components. If the driving connecting rod 10 is directly connected, since the piston rod in the clamping driving cylinder 5 will rotate, there will inevitably be a certain gap between the positions of the hinged connection points of the swing arm and the driving rod. Once the piston rod rotates, the positional relationship of the left and right swing arms may be deformed to a certain extent, which may cause the clamping and fixing position of the workpiece to shift. To this end, in the embodiment of the utility model, preferably, a slider 11 is provided below the clamping driving cylinder 5 and fixedly connected to the piston rod of the clamping driving cylinder 5, and a limiting structure is provided on the bracket 1 to vertically slide with the slider 11 to prevent the piston rod of the clamping driving cylinder 5 from rotating, and the driving connecting rod 10 is hinged to the piston rod of the clamping driving cylinder 5 through the slider 11. That is, the driving connecting rod 10 is hinged to the slider 11. The slider 11 can be connected to the piston rod by welding, bolt connection, threaded connection, etc. After the slider 11 and the limiting structure are set, the limiting structure can cooperate with the slider 11 in vertical sliding to limit the slider 11 and the piston rod from rotating around their axes during vertical movement, thereby better ensuring the relative position relationship between the driving connecting rod 10 and the swing arm on both sides, thereby facilitating better ensuring the accuracy of the clamping working position of the clamping device.

[0027] Generally speaking, the limiting structure can be a square guide rail 9 that vertically slides with the slider 11, or two circular guide rails that vertically slide with the slider 11. Of course, the limiting structure can also be a circular guide rail that vertically slides with the slider 11, and the circular guide rail does not need to be set at the center of the slider 11.

[0028] The support block is arranged on the bracket 1 by welding, bolt connection or an integral structure with the bracket. In order to facilitate the adjustment of the height of the support block as needed to adjust the clamping position of the workpiece, the bracket 1 is provided with a height adjustment mechanism connected to the support block 2 for adjusting the height of the support block 2. In some embodiments, the height adjustment mechanism is adjusted by a hydraulic cylinder or a pneumatic cylinder supported under the support block 2. In some embodiments, the height adjustment mechanism includes a slide rail vertically arranged on the bracket and a locking screw for locking the position of the support block 2, and the support block 2 is installed on the slide rail. When adjusting the height, the support block 2 slides along the slide rail to the appropriate position, and then the support block 2 is locked on the slide rail by the locking screw. Figure 4 As shown, in the embodiment of the present invention, the height adjustment mechanism includes a screw rod 12 supported and arranged below the support block 2, the upper end of the screw rod 12 is rotatably connected to the support block 2, and the lower end is threadedly connected to the bracket 1 through its thread. The support block 2 can be moved up and down or lowered by rotating the screw rod 12, so that the height of the support block can be adjusted and the clamping position of the workpiece can be adjusted. In order to prevent the screw rod 12 from loosening, a back-tightening nut can be set on the screw rod 12.

[0029] like Figure 3 As shown, the bracket 1 is provided with a first limiting surface 13 that cooperates with the left swing arm 6 to limit the travel of the left clamping block 3 moving toward the right clamping block 4, and the bracket 1 is also provided with a second limiting surface 14 that cooperates with the right swing arm 7 to limit the travel of the right clamping block 4 moving toward the left clamping block 3. The first limiting surface 13 and the second limiting surface 14 are set according to the corresponding positions of the left swing arm 6 and the right swing arm 7 when the right clamping block 4 and the left clamping block 3 clamp the workpiece. After setting the first limiting surface 13 and the second limiting surface 14, the left and right clamping blocks can be better limited, and the workpiece can be better ensured not to be damaged by clamping.

[0030] The left clamp block 3 and the right clamp block 4 can be installed on the corresponding swing arm in a detachable or non-detachable connection. Among them, the non-detachable connection can be welded, integrated with the swing arm, etc.; the detachable connection can be bolted, latched, clamped, etc. Since the left and right clamp blocks are brought closer to each other by the rotation of the swing arm, when the width of the workpiece changes, in order to make the left and right clamp blocks better cooperate with the workpiece and clamp the workpiece, the left clamp block 3 is detachably connected to the left swing arm 6, and the right clamp block 4 is detachably connected to the right swing arm 7. In this way, when the width of the workpiece increases, a corresponding thinner clamp block can be replaced on the swing arm to ensure that the side of the clamp block can better contact the side of the workpiece when clamping the workpiece.

Claims

1. A centering clamping device, characterized in that: The invention comprises a bracket (1), a clamping drive cylinder (5), a left clamping block (3), a right clamping block (4), and also comprises a left swing arm (6) for driving the left clamping block (3) to move towards or away from the right clamping block (4) and a right swing arm (7) for driving the right clamping block (4) to move towards or away from the left clamping block (3); The support (1) is provided with a support block (2) for supporting a workpiece, and the left clamping block (3) and the right clamping block (4) are respectively arranged on both sides of the support block (2) and are arranged opposite to each other; The left swing arm (6) is arranged on a side of the support block (2) where the left clamping block (3) is arranged, and the right swing arm (7) is arranged on a side of the support block (2) where the right clamping block (4) is arranged. The left swing arm (6) and the right swing arm (7) are respectively hingedly connected to the bracket (1) via hinge shafts (8) arranged between their upper and lower ends. A spacing is provided between the left swing arm (6) and the right swing arm (7) to form a clamping drive cylinder installation space (15). The clamping drive cylinder (5) is inverted in the clamping drive cylinder installation space (15) so that its piston rod is vertically downward. The lower ends of the left swing arm (6) and the right swing arm (7) are respectively provided with a driving connecting rod (10) with one end hinged thereto, and the other end of the driving connecting rod (10) is hinged to the piston rod of the clamping drive cylinder (5); The left clamping block (3) is mounted on the upper end of the left swing arm (6), and the right clamping block (4) is mounted on the upper end of the right swing arm (7).

2. A centering clamping device according to claim 1, characterized in that: The clamping drive cylinder (5) is a hydraulic cylinder.

3. A centering clamping device according to claim 1 or 2, characterized in that: It also includes a sliding block (11) arranged below the clamping drive cylinder (5) and fixedly connected to the piston rod of the clamping drive cylinder (5); the bracket (1) is provided with a limiting structure that vertically slides with the sliding block (11) to prevent the piston rod of the clamping drive cylinder (5) from rotating; the driving connecting rod (10) is hinged to the piston rod of the clamping drive cylinder (5) via the sliding block (11).

4. A centering clamping device as claimed in claim 3, characterized in that: The limiting structure is a square guide rail (9) that vertically slides with the slider (11).

5. A centering clamping device according to claim 1, characterized in that: The bracket (1) is provided with a height adjustment mechanism which is connected to the support block (2) and is used to adjust the height of the support block (2).

6. A centering clamping device according to claim 5, characterized in that: The height adjustment mechanism comprises a screw rod (12) supported and arranged below the support block (2); the upper end of the screw rod (12) is rotatably connected to the support block (2), and the lower end is threadedly connected to the bracket (1) through its thread.

7. A centering clamping device according to claim 1, characterized in that: The bracket (1) is provided with a first limiting surface (13) cooperating with the left swing arm (6) to limit the travel of the left clamping block (3) in a direction approaching the right clamping block (4); the bracket (1) is also provided with a second limiting surface (14) cooperating with the right swing arm (7) to limit the travel of the right clamping block (4) in a direction approaching the left clamping block (3).

8. A centering clamping device according to claim 1 or 7, characterized in that: The left clamping block (3) is detachably connected to the left swing arm (6), and the right clamping block (4) is detachably connected to the right swing arm (7).

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