Double-end clamp

Abstract

The utility model provides a double-end clamp, belongs to the technical field of clamps, and solves the problems that an existing clamping jaw is poor in flexibility and high in maintenance cost. The double-end clamp comprises a rotating arm, a driving piece capable of driving the rotating arm to rotate is arranged on the rotating arm, two clamping arms are arranged at the two ends of the rotating arm respectively, and the double-end clamp is characterized in that the two ends of the rotating arm are further fixedly connected with two-way air cylinders respectively, piston rods are arranged on the air cylinders, and the two clamping arms located at the same end of the rotating arm are fixedly connected with the two ends of the piston rods respectively. The opposite side faces of the two clamping arms are detachably connected with oppositely-protruding fixing heads, and the air cylinder drives the clamping arms to be close to or away from each other in the width direction of the rotary arm. According to the double-end clamp, the flexibility of the clamping jaws is improved, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of fixtures and relates to a double - headed fixture. Background Art

[0002] Jaw is a common structure of mechanical equipment, which is used to grab objects to realize the extraction or transfer of objects. It is widely used in various fields such as manufacturing, replacing traditional manual handling and greatly reducing labor intensity.

[0003] However, in actual production, if there are two processing platforms set in different directions, due to the different directions, a single jaw cannot process the products on the two processing platforms at the same time, and cannot meet the requirements of all platforms. Then, jaws need to be designed one by one, which will increase costs.

[0004] For this reason, Chinese Patent Application (Application No.: 201710861625.0) discloses a symmetric jaw fixture that can rotate 180°, including a connecting shaft, a flange mounting seat, a mounting plate and jaws. Fixed blocks are respectively arranged on the opposite sides of the flange mounting seat. The mounting plate is arranged on the fixed blocks. The jaws are arranged on the mounting plate and can rotate on the mounting plate. A clamping rod is arranged on the jaws. The flange mounting seat is set as a structure that can rotate on a robot through the connecting shaft. By rotating the position of the flange mounting seat on the robot, the flange mounting seat can drive the jaws and the clamping rods on the jaws to rotate.

[0005] However, the above method has the following defects: 1. The shapes and sizes of different workpieces are different. The shape of the clamping surface of the clamping rod is fixed, and the clamping rods can only approach or move away from each other within a fixed stroke, and cannot be adaptively adjusted for workpieces with different shapes and sizes, so the flexibility is poor. 2. If the clamping rods are worn or knocked, it is difficult to clamp the workpiece stably and reliably, and the whole clamping rod needs to be replaced, resulting in a high maintenance cost. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a double - headed fixture for the existing technical problems above. The technical problem to be solved by the utility model is: how to improve the flexibility of the jaws and reduce the maintenance cost.

[0007] The purpose of the utility model can be realized by the following technical solutions: A double - headed fixture includes a rotating arm. A driving member capable of driving the rotating arm to rotate is arranged on the rotating arm. Two clamping arms are respectively arranged at both ends of the rotating arm. It is characterized in that two double - acting cylinders are respectively fixedly connected to both ends of the rotating arm. A piston rod is arranged on the cylinder. The two clamping arms at the same end of the rotating arm are respectively fixedly connected to both ends of the piston rod. Relatively protruding fixed heads are detachably connected to the opposite side surfaces of the two clamping arms. The cylinder drives the clamping arms to approach or move away from each other along the width direction of the rotating arm.

[0008] The piston rod extends along the width direction of the rotating arm, and both ends of the piston rod protrude out of the side wall of the cylinder and are connected to the clamping arms. During the working process, the driving member drives the rotating arm to rotate, so that the clamping arms at both ends of the rotating arm move to the corresponding working positions respectively, and the target workpiece is placed in the gap between the two clamping arms. Then, the double-acting cylinder drives the two clamping arms located at the same end of the rotating arm to approach each other along the width direction of the rotating arm, and the fixed head clamps the workpiece. The clamping arm clamps the workpiece through the fixed head, and the fixed head is detachably connected to the clamping arm. By replacing the fixed head with a different end face shape, it can quickly adapt to workpieces of different shapes, with high flexibility. Using a double-acting cylinder as the driving device for the clamping arm, by adjusting the driving stroke of the cylinder, it can quickly adapt to workpieces of different sizes, with high flexibility. The clamping arm clamps the workpiece through the fixed head, without replacing the entire clamping arm. Replacing the worn or damaged fixed head can ensure stable and reliable clamping operation of the workpiece, with low maintenance costs.

[0009] In the above double-head fixture, flexible gaskets are bonded to the opposite side faces of the two clamping arms located at the same end of the rotating arm, and the flexible gaskets cover the end portions of the fixed head protruding towards the inner side of the clamping arm. The setting of the flexible gasket can not only effectively protect the surface of the clamped workpiece, prevent scratches and indentations, but also reduce the wear of the fixed head and extend its service life. In addition, the flexible gasket also provides a flexible clamping surface. When clamping an irregularly shaped object, it can absorb impact and vibration, better fit the surface of the object, reduce the noise and vibration during the operation of the clamping arm, and ensure stable clamping.

[0010] In the above double-head fixture, the clamping arm is provided with a threaded hole penetrating along the width direction of the rotating arm, and the fixed head is threadedly connected to the threaded hole. In a threaded connection, the contact area between the external thread and the internal thread is large, and the frictional force is large. Each turn of the thread evenly distributes the load through the spiral contact surface, avoiding concentrated stress. Moreover, when the threaded connection is subjected to a load, it can automatically maintain the locked state, preventing loosening under the action of external vibration or load, thus ensuring the stability of the connection. In addition, without complex tools, the fixed head can be easily installed and disassembled by rotation, with simple operation and high working efficiency.

[0011] In the above double-head fixture, the clamping arm includes a jaw and a connecting plate. The connecting plate is fixedly connected to the jaw and the piston rod respectively, and the threaded hole is located at the end of the jaw. The connecting plate can absorb and disperse the impact force between the jaw and the piston rod, avoid concentrated stress, effectively play a role in shock absorption and buffering, and effectively extend the service life.

[0012] In the above-mentioned double-head fixture, at least two piston rods are provided along the width direction of the connecting plate, and at least two piston rods are provided along the height direction of the connecting plate. The multiple piston rods provide multiple connection points in the width and height directions of the connecting plate, dispersing the load, avoiding excessive single-point stress that may cause unstable clamping, and reducing the wear of a single piston rod, thereby extending the service life. In addition, if one of the piston rods fails, the other piston rods can still drive the clamping arms to approach or move away from each other along the width direction of the rotating arm normally, thus improving the reliability.

[0013] In the above-mentioned double-head fixture, the jaw is in a Z shape, and one end of the jaw is fixed to the connecting plate, while the other end is provided with a threaded hole. When one end of the jaw aligns with the target workpiece for clamping, the middle section of the Z shape provides a clearance space for the workpieces or obstacles around the target workpiece, enabling the jaw to easily clamp the target workpiece without having to rearrange the workpieces on the workbench, improving the operation flexibility and work efficiency.

[0014] In the above-mentioned double-head fixture, the flexible gasket is made of rubber. The surface of the rubber has a relatively high friction coefficient, which can effectively increase the friction force between the jaw and the target workpiece, ensuring clamping stability. Rubber has excellent wear resistance, enabling it to maintain stable performance during long-term use and reducing the maintenance frequency. In addition, rubber is easy to be processed into various shapes and sizes, facilitating the production of gaskets that can meet different clamping requirements.

[0015] Compared with the prior art, the present double-head fixture has the following advantages:

[0016] 1. In the present double-head fixture, the clamping arm clamps the workpiece through the fixed head. The fixed head is detachably connected to the clamping arm. By replacing the fixed head with a different end face shape, it can quickly adapt to workpieces of different shapes, with relatively high flexibility.

[0017] 2. In the present double-head fixture, a double-acting cylinder is used as the driving device of the clamping arm. By adjusting the driving stroke of the cylinder, it can quickly adapt to workpieces of different sizes, with relatively high flexibility.

[0018] 3. In the present double-head fixture, the clamping arm clamps the workpiece through the fixed head. There is no need to replace the entire clamping arm. By replacing the worn or damaged fixed head, it can ensure stable and reliable clamping operation of the workpiece, with relatively low maintenance costs. Brief Description of the Drawings

[0019] Figure 1 is the overall assembly structure schematic diagram of the present double-head fixture.

[0020] Figure 2 is the partial structure schematic diagram of the present double-head fixture.

[0021] Figure 3 is the bottom view of the present double-head fixture.

[0022] Figure 4 is Figure 3 a sectional view along the A-A direction in

[0023] Figure 5 is Figure 3 a sectional view along the B-B direction in

[0024] In the figure, 1. slewing arm; 2. driving part; 3. clamping arm; 3a. jaw; 3b. connecting plate; 4. cylinder; 4a. piston rod; 5. fixed head; 6. flexible gasket; 7. threaded hole. Specific embodiments

[0025] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0026] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0027] As Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 shown, this double-head fixture includes a long strip-shaped slewing arm 1.

[0028] A driving part 2 capable of driving the slewing arm 1 to rotate is provided on the slewing arm 1. Specifically, the driving part 2 can be a motor.

[0029] Two-way cylinders 4 are respectively fixedly connected to both ends of the slewing arm 1, and piston rods 4a are provided on the cylinders 4. Two clamping arms 3 are also respectively provided at both ends of the slewing arm 1, and the two clamping arms 3 located at the same end of the slewing arm 1 are respectively fixedly connected to both ends of the piston rod 4a.

[0030] Specifically, the clamping arm 3 includes a jaw 3a and a connecting plate 3b, and the connecting plate 3b is fixedly connected to the jaw 3a and the piston rod 4a respectively. The connecting plate 3b can absorb and disperse the impact force between the jaw 3a and the piston rod 4a, avoid stress concentration, effectively play a role in shock absorption and buffering, and effectively extend the service life.

[0031] The jaw 3a is in a Z shape. When one end of the jaw 3a aligns with the target workpiece for clamping, the middle section of the Z shape provides a space for the workpieces or obstacles around the target workpiece, enabling the jaw 3a to easily clamp the target workpiece without having to rearrange the workpieces on the workbench, improving the flexibility of operation and the work efficiency.

[0032] One end of the jaw 3a is fixedly connected to the connecting plate 3b by threads, and the other end is provided with a threaded hole 7 penetrating along the width direction of the swing arm 1. On the opposite side surfaces of the two jaws 3a located at the same end of the swing arm 1, relatively protruding fixed heads 5 are detachably connected, and the fixed heads 5 are threadedly connected to the threaded holes 7. In threaded connection, the contact area between the external thread and the internal thread is large, and the friction force is large. Each turn of the thread evenly distributes the load through the spiral contact surface, avoiding concentrated stress. Moreover, when the threaded connection is subjected to a load, it can automatically maintain the locked state, preventing loosening under the action of external vibration or load, thereby ensuring the stability of the connection. In addition, without complex tools, the fixed head 5 can be rotated to easily achieve installation and disassembly, with simple operation and high work efficiency.

[0033] The piston rod 4a extends along the width direction of the swing arm 1, and both ends of the piston rod 4a extend out of the side wall of the cylinder 4 and are fixedly connected to the connecting plate 3b. At least two piston rods 4a are provided along the width direction of the connecting plate 3b, and at least two piston rods 4a are provided in the height direction of the connecting plate 3b. The multiple piston rods 4a provide multiple connection points in the width and height directions of the connecting plate 3b, dispersing the load, avoiding excessive single-point stress resulting in unstable clamping, and can also reduce the wear of a single piston rod 4a, thereby extending the service life. In addition, if one of the piston rods 4a fails, the other piston rods 4a can still normally drive the clamping arm 3 to approach or move away from each other along the width direction of the swing arm 1, thereby improving the reliability.

[0034] On the opposite side surfaces of the two jaws 3a located at the same end of the swing arm 1, flexible gaskets 6 are bonded, and the flexible gaskets 6 cover the end portions of the fixed heads 5 protruding towards the inner side of the clamping arm 3. The setting of the flexible gaskets 6 can not only effectively protect the surface of the workpiece to be clamped, prevent scratches and indentations, but also reduce the wear of the fixed heads 5 and extend the service life. In addition, the flexible gaskets 6 also provide a flexible clamping surface. When clamping an irregularly shaped object, they can absorb impacts and vibrations, better fit the surface of the object, reduce the noise and vibration during the operation of the clamping arm 3, and ensure stable clamping.

[0035] Specifically, the flexible gasket 6 is made of rubber. The surface of the rubber has a high friction coefficient, which can effectively increase the friction force between the jaw 3a and the target workpiece, ensuring clamping stability. Rubber has excellent wear resistance, enabling it to maintain stable performance during long-term use and reducing the maintenance frequency. In addition, rubber is easy to process into various shapes and sizes, facilitating the production of gaskets that meet different clamping requirements.

[0036] As an alternative, the flexible gasket 6 can also be made of flexible materials such as silicone and nylon.

[0037] During the working process, the driving member 2 drives the swing arm 1 to rotate, so that the clamping arms 3 at both ends of the swing arm 1 are moved to the corresponding working positions respectively, and the target workpiece is placed in the gap between the two clamping jaws 3a. Then, the bidirectional cylinder 4 drives the two connecting plates 3b located at the same end of the swing arm 1 to approach each other along the width direction of the swing arm 1, and then drives the clamping jaws 3a to approach each other along the width direction of the swing arm 1. The fixed head 5 clamps the workpiece through the flexible pad 6.

[0038] The clamping arm 3 clamps the workpiece through the fixed head 5. The fixed head 5 is detachably connected to the clamping arm 3. By replacing the fixed head 5 with different end face shapes, it can quickly adapt to workpieces of different shapes, and it has high flexibility. The bidirectional cylinder 4 is used as the driving device of the clamping arm 3. By adjusting the driving stroke of the cylinder 4, it can quickly adapt to workpieces of different sizes, and it has high flexibility. The clamping arm 3 clamps the workpiece through the fixed head 5. There is no need to replace the entire clamping arm 3. Replacing the worn or bumped fixed head 5 can ensure stable and reliable clamping operation of the workpiece, and the maintenance cost is low.

[0039] Although the present invention uses more terms such as rotary arm 1, driving member 2, clamping arm 3, clamping claw 3a, connecting plate 3b, cylinder 4, piston rod 4a, fixed head 5, flexible pad 6, threaded hole 7, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A double-headed fixture, comprising a rotating arm (1), a driving member (2) capable of driving the rotation of the rotating arm (1) is provided on the rotating arm (1), and two clamping arms (3) are respectively provided at both ends of the rotating arm (1), characterized in that, Both ends of the swing arm (1) are respectively fixedly connected with a double-acting cylinder (4). A piston rod (4a) is provided on the cylinder (4). Two clamping arms (3) located at the same end of the swing arm (1) are respectively fixedly connected with both ends of the piston rod (4a). Oppositely protruding fixing heads (5) are detachably connected to the opposite side surfaces of the two clamping arms (3). The cylinder (4) drives the clamping arms (3) to approach or move away from each other along the width direction of the swing arm (1).

2. The double-headed fixture according to claim 1, characterized in that, Flexible gaskets (6) are bonded to the opposite side surfaces of the two clamping arms (3) located at the same end of the swing arm (1). The flexible gaskets (6) cover the end portions of the fixing heads (5) protruding towards the inner sides of the clamping arms (3).

3. A double-headed fixture according to claim 1 or 2, characterized in that, A threaded hole (7) is provided through the clamping arm (3) along the width direction of the swing arm (1). The fixing head (5) is threadedly connected to the threaded hole (7).

4. The double-headed fixture according to claim 3, characterized in that, The clamping arm (3) includes a claw (3a) and a connecting plate (3b). The connecting plate (3b) is respectively fixedly connected with the claw (3a) and the piston rod (4a). The threaded hole (7) is located at the end of the claw (3a).

5. A double-headed fixture according to claim 4, characterized in that, At least two piston rods (4a) are provided along the width direction of the connecting plate (3b), and at least two piston rods (4a) are provided along the height direction of the connecting plate (3b).

6. The double-headed fixture according to claim 5, characterized in that, The claw (3a) is in a Z shape. One end of the claw (3a) is fixed to the connecting plate (3b), and the other end is provided with a threaded hole (7).

7. The double-headed fixture according to claim 2, characterized in that, The flexible gasket (6) is made of rubber.

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