Clamp with self-locking function and turnover device comprising same

By adopting a fixture with self-locking function and a limiting mechanism, the problem of workpiece rotation restriction caused by collision of the locking cylinder is solved, realizing workpiece self-locking and unrestricted rotation, and extending the service life of the rotation fixture.

CN223531946UActive Publication Date: 2025-11-11YICHANG ENHANCE ULTRASONIC ELECTRIC
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Patent Information

Application Number
CN202423162908.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2025-11-11
Estimated Expiration
2034-12-20

AI Technical Summary

Technical Problem

The locking cylinders at both ends of the workpiece will collide with the locking cylinders that control the extension and retraction of the two clamping arms, resulting in restricted workpiece rotation. Existing solutions increase the load on the slider and guide rail, shortening the service life of the rotation fixture.

Method used

A self-locking fixture, including a housing, cylinder, guide shaft, spring, and limit mechanism, is used to replace the traditional locking cylinder. This achieves workpiece clamping and self-locking upon air cut-off, avoiding the need for increased clamping arm length. Combined with the drive motor and limit mechanism, it ensures unrestricted workpiece rotation.

Benefits of technology

It achieves workpiece clamping self-locking, avoids increasing the length of the clamping arm, reduces wear on the guide rail slider, extends the life of the flipping fixture, has a compact structure, and allows for unrestricted flipping.

✦ Generated by Eureka AI based on patent content.

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Abstract

A clamp with a self-locking function and a turnover device comprising the clamp comprise a shell, a top cover is fixedly connected to the shell, an air cylinder is fixedly connected to the top cover, a connecting block is arranged in the shell, an air cylinder piston rod is fixedly connected with the connecting block, a plurality of shaft holes are formed in the bottom of the shell, and guide shafts are assembled in the shaft holes. The lower end of the guide shaft is fixedly connected with the lower clamping plate, the upper end of the guide shaft is fixedly connected with the connecting block, the guide shaft is sleeved with a spring, the two ends of the spring abut against the connecting block and the shell respectively, and the upper clamping plate is fixedly connected to one side of the shell. The utility model is used for solving the problem that the overturning of the workpiece is limited because the cylinder with the lock for clamping the two ends of the workpiece can touch the cylinder with the lock for controlling the two clamping arms to extend and retract.
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Description

Technical Field

[0001] This utility model relates to a clamp with a self-locking function and a flipping device containing the clamp. Background Technology

[0002] During workpiece processing, it is sometimes necessary to flip the workpiece at an angle. Currently, the cylinders that hold the two ends of the workpiece and control the extension and retraction of the two clamping arms are all locking cylinders (also known as locking cylinders). However, the length of the locking cylinder is relatively long. When the workpiece is flipped inward, the locking cylinders holding the two ends of the workpiece will collide with the locking cylinders controlling the extension and retraction of the two clamping arms, which will restrict the workpiece flipping. The current solution is to extend the clamping arms. Although this can avoid the two locking cylinders colliding, it increases the load on the slider and guide rail, causing the guide rail and slider to wear too quickly and shortening the service life of the flipping fixture. Utility Model Content

[0003] The purpose of this utility model is to provide a clamp with a self-locking function and a flipping device containing the clamp, so as to solve the problem that the locking cylinders at both ends of the workpiece will encounter the locking cylinders that control the extension and retraction of the two clamping arms, resulting in the workpiece flipping being restricted.

[0004] To solve the above problems, the technical solution of this utility model is as follows:

[0005] A self-locking clamp includes a housing, a top cover fixedly connected to the housing, a cylinder fixedly connected to the top cover, a connecting block provided inside the housing, a piston rod of the cylinder fixedly connected to the connecting block, multiple shaft holes opened at the bottom of the housing, guide shafts assembled in the shaft holes, the lower end of the guide shaft fixedly connected to a lower clamping plate, the upper end of the guide shaft fixedly connected to the connecting block, a spring sleeved on the guide shaft, the two ends of the spring abutting against the connecting block and the housing respectively, and an upper clamping plate fixedly connected to one side of the housing.

[0006] It also includes a mounting base, which has multiple pin holes, and a guide shaft is set in each pin hole.

[0007] A workpiece flipping device includes two self-locking clamps and a back plate. Multiple guide rails are arranged parallel to each other on the back plate, and multiple sliders are mounted on the guide rails. Two clamping arms are spaced apart and mounted on the guide rail sliders. A locking cylinder is fixedly connected to one of the clamping arms, and the piston rod of the locking cylinder is connected to the other clamping arm via a connecting rod. A rotating shaft is mounted at one end of each clamping arm, and a rotating plate is fixedly connected to the opposite ends of the two rotating shafts. The two self-locking clamps are respectively mounted on the two rotating plates. A drive motor is mounted on one of the clamping arms and is connected to the rotating shaft. The two rotating plates are connected by a guide rod and a guide sleeve.

[0008] Each clamping arm has a first limiting mechanism fixedly connected to the back plate on both sides for limiting the clamping arm. The first limiting mechanism includes a support fixedly connected to the back plate, and a buffer and a first limiting screw are installed on the support.

[0009] The back plate has travel indicator mechanisms at both ends. The travel indicator mechanism includes corner brackets fixedly connected to the back plate, two photoelectric switches are mounted on the corner brackets, and contact pieces for alternately triggering the two photoelectric switches are installed on the clamping arms.

[0010] A second limiting mechanism is fixedly connected to one of the two clamping arms. The second limiting mechanism includes a flange ring fixedly connected to the clamping arm, a rotating shaft located inside the flange ring, a limiting sleeve fixedly connected to one end of the rotating shaft located inside the flange ring, a limiting block fixedly connected to the limiting sleeve, a limiting rod fixedly connected to the limiting block, and two second limiting screws threadedly connected to the flange ring. The rotating shaft drives the two ends of the limiting rod to alternately strike the two second limiting screws.

[0011] The beneficial effects of this utility model are as follows: replacing the locking cylinders that hold the two ends of the workpiece in the flipping device with this fixture, this fixture can achieve both clamping of the workpiece and self-locking when the air is cut off, compared with the locking cylinder. It has the same function and effect as the locking cylinder, and its length is shorter than that of the locking cylinder, so there is no need to extend the length of the clamping arm. At the same time, the workpiece flipping is no longer restricted by the locking cylinder. Furthermore, this fixture has a simple structure, and the workpiece flipping device has a more compact structure. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings:

[0013] Figure 1 This is a three-dimensional structural diagram of the workpiece flipping device of this utility model;

[0014] Figure 2 This is a three-dimensional structural diagram of the workpiece flipping device of this utility model. The fixed base and the housing are not shown in the figure.

[0015] Figure 3 This is a schematic cross-sectional view of the present invention.

[0016] Figure 4 This is a three-dimensional structural diagram of the flipping device of this utility model.

[0017] Figure 5 This is a three-dimensional structural diagram of the flipping device of this utility model.

[0018] Figure 6 This is a three-dimensional structural diagram of the flipping device of this utility model.

[0019] In the diagram: Cylinder 1, Housing 2, Fixing base 3, Lower clamping plate 4, Positioning pin 5, Upper clamping plate 6, Top cover 7, Guide shaft 8, Spring 9, Connecting block 10, Connecting rod 11, Back plate 12, Guide rail 13, Limiting mechanism 14, Locking cylinder 15, Drive motor 16, Guide sleeve 17, Guide rod 18, Clamping arm 19, Stroke indicator mechanism 20, Rotating plate 21, Second limiting mechanism 22, Angle code 201, Contact piece 202, Photoelectric switch 203, Second limiting screw 221, Limiting block 222, Four-slot nut 223, Flange ring 224, Limiting rod 225. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1:

[0022] like Figures 1 to 3 As shown, a self-locking clamp includes a housing 2, a top cover 7 fixedly connected to the housing 2, a cylinder 1 fixedly connected to the top cover 7, a connecting block 10 provided inside the housing 2, the piston rod of the cylinder 1 fixedly connected to the connecting block 10, multiple shaft holes opened at the bottom of the housing 2, a guide shaft 8 assembled in the shaft holes, the lower end of the guide shaft 8 fixedly connected to the L-shaped lower clamping plate 4, the upper end of the guide shaft 8 fixedly connected to the connecting block 10, a mold spring 9 sleeved on the guide shaft 8, the two ends of the spring 9 respectively abutting against the connecting block 10 and the housing 2, an upper clamping plate 6 fixedly connected to one side of the housing 2, and multiple positioning pins 5 assembled on the end face of the upper clamping plate 6 facing the lower clamping plate 4.

[0023] In use, the piston rod of cylinder 1 extends, pushing the connecting block 10 downward to drive the upper clamping plate 6 and the lower clamping plate 4 away from each other. After the workpiece is placed between the upper clamping plate 6 and the lower clamping plate 4, the piston rod of cylinder 1 retracts, and the upper clamping plate 6 and the lower clamping plate 4 clamp the workpiece. At the same time, the positioning pin positions the workpiece. If the air supply to cylinder 1 is cut off, the spring 9 set in the housing 2 will still push the upper clamping plate 6 and the lower clamping plate 4 to clamp the workpiece, realizing the self-locking function when the air supply is cut off. Moreover, compared with the locking cylinder 15, this utility model is shorter in length and has a simpler structure.

[0024] It also includes a fixed base 3, which has multiple pin holes, and a guide shaft 8 is disposed in each pin hole. In use, the fixed base 3 is mounted on the rotating plate 21. When the cylinder 1 drives the upper clamping plate 6 and the lower clamping plate 4 to move away from each other, the guide shaft can move up and down within the fixed base 3 to adjust the gap between the upper clamping plate 6 and the lower clamping plate 4 so that it can accommodate workpieces that are not in the correct position.

[0025] Example 2:

[0026] like Figures 4 to 6 As shown, a workpiece flipping device includes two self-locking clamps and a back plate 12. Multiple guide rails 13 are arranged parallel to each other on the back plate 12. Multiple sliders are mounted on the guide rails 13. Two clamping arms 19 are spaced apart and mounted on the sliders of the guide rails 13. A locking cylinder 15 is fixedly connected to one of the clamping arms 19. The piston rod of the locking cylinder 15 is connected to the other clamping arm 19 via a connecting rod 11. A rotating shaft is mounted at one end of each clamping arm 19. A rotating plate 21 is fixedly connected to one end of each of the two rotating shafts. The two self-locking clamps are respectively mounted on the two rotating plates 21. On the moving plate 21, a drive motor 16 is installed on one of the clamping arms 19. The drive motor 16 is a worm gear reducer. The self-locking function of the worm gear reducer can effectively prevent the workpiece from rotating. The drive motor 16 is connected to the rotating shaft. The two rotating plates 21 are connected by a guide rod 18 and a guide sleeve 17. Since the two rotating plates 21 are connected by the guide rod 18 and the guide sleeve 17, when one rotating plate 21 rotates, it can drive the other rotating plate 21 to rotate. At the same time, the two rotating plates 21 can move away from or close to each other.

[0027] The working process of Example 2 is as follows: After moving the two clamping arms 19 to both sides of the workpiece, the locking cylinder 15 drives the two clamping arms 19 to approach the workpiece, so that both ends of the workpiece enter the two self-locking fixtures. Then, the piston rod of the cylinder 1 in the self-locking fixture retracts, and the upper clamping plate 6 and the lower clamping plate 4 clamp the workpiece. Then, the drive motor 16 drives the workpiece to flip inward. After the workpiece is flipped, the self-locking fixture releases the workpiece, and at the same time, the locking cylinder 15 drives the two clamping arms 19 away from the workpiece, thus completing the workpiece flipping process.

[0028] Each clamping arm 19 is fixedly connected to a first limiting mechanism 14 on both sides of the back plate 12 for limiting the clamping arm 19. The first limiting mechanism 14 includes a support 141 fixedly connected to the back plate 12, and a buffer 142 and a first limiting screw 143 are installed on the support 141. When the first limiting mechanism 14 is working, the piston rod of the locking cylinder 15 extends, driving the two clamping arms 19 to move outward. During the movement, the two clamping arms 19 first collide with the two buffers 142 located on the outer side of the back plate 12, slowing down the movement speed of the clamping arms 19 and protecting the clamping arms 19. When approaching the limit position of the buffers 142, the clamping arms 19 collide with the two first limiting screws 143 to protect the buffers 142. In this way, the clamping arms 19 can be limited while protecting both the clamping arms 19 and the buffers 142. When the piston rod of the locking cylinder 15 retracts, it collides with the two buffers 142 located on the inner side of the back plate 12, realizing shock absorption and gripping of the workpiece.

[0029] A stroke indication mechanism 20 is provided at both ends of the back plate 12. The stroke indication mechanism 20 includes a corner bracket 201 fixedly connected to the back plate 12. Two photoelectric switches 203 are mounted on the corner bracket 201. Contact pieces 202 for alternately triggering the two photoelectric switches 203 are installed on the clamping arm 19. The two photoelectric switches 203 detect the movement position of the clamping arm 19 and transmit the detected signal to the PLC controller (not shown in the diagram). The PLC controller controls the start and stop of the locking cylinder 15.

[0030] A second limiting mechanism 22 is fixedly connected to one of the two clamping arms 19. The second limiting mechanism 22 includes a flange ring 224 fixedly connected to the clamping arm 19, a rotating shaft 23 located inside the flange ring 224, a limiting sleeve fixedly connected to one end of the rotating shaft 23 inside the flange ring 224, the limiting sleeve and the rotating shaft 23 being connected by a key, a limiting block 222 fixedly connected to the limiting sleeve, a limiting rod 225 fixedly connected to the limiting block 222, and two second limiting screws 221 threadedly connected to the flange ring 224. The rotating shaft 23 drives the two ends of the limiting rod 225 to alternately strike the two second limiting screws 221. After the self-locking fixture grabs the workpiece, the drive motor 16 drives the workpiece to flip. During the flipping process, the rotating shaft 23 rotates. The rotating shaft 23 drives the limiting rod 225 to rotate through the limiting sleeve and the limiting block 222. The two ends of the limiting rod 225 alternately touch the two second limiting screws 221, thereby limiting the rotation angle of the rotating shaft 23, so as to limit the rotation angle of the workpiece and prevent the workpiece from hitting the back plate 12 or the locking cylinder 15, thus protecting the workpiece and the workpiece flipping device.

[0031] The embodiments described in this specification are merely examples of implementations of the inventive concept. The scope of protection of this utility model should not be considered as limited to the specific forms described in the embodiments. The scope of protection of this utility model also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. A clamp with a self-locking function, characterized in that: Includes a housing (2), a top cover (7) fixedly connected to the housing (2), a cylinder (1) fixedly connected to the top cover (7), a connecting block (10) provided inside the housing (2), the piston rod of the cylinder (1) fixedly connected to the connecting block (10), multiple shaft holes are provided at the bottom of the housing (2), a guide shaft (8) is assembled in the shaft holes, the lower end of the guide shaft (8) is fixedly connected to the lower clamping plate (4), the upper end of the guide shaft (8) is fixedly connected to the connecting block (10), a spring (9) is sleeved on the guide shaft (8), the two ends of the spring (9) abut against the connecting block (10) and the housing (2) respectively, and an upper clamping plate (6) is fixedly connected to one side of the housing (2).

2. A clamp with self-locking function according to claim 1, characterized in that: It also includes a fixed seat (3), which has multiple pin holes, and a guide shaft (8) is set in each pin hole.

3. A workpiece flipping device, characterized in that: The device includes two self-locking clamps as described in claim 1 or 2, and a back plate (12). Multiple guide rails (13) are arranged parallel to each other on the back plate (12). Multiple sliders are mounted on the guide rails (13). Two clamping arms (19) are mounted on the sliders of the guide rails (13) at intervals. A locking cylinder (15) is fixedly connected to one of the clamping arms (19). The piston rod of the locking cylinder (15) is connected to the other clamping arm (19) through a connecting rod (11). A rotating shaft (23) is mounted at one end of each clamping arm (19). A rotating plate (21) is fixedly connected to the opposite end of the two rotating shafts (23). The two self-locking clamps are respectively mounted on the two rotating plates (21). A drive motor (16) is installed on one of the clamping arms (19). The drive motor (16) is connected to the rotating shaft (23) for transmission. The two rotating plates (21) are connected by a guide rod (18) and a guide sleeve (17).

4. The workpiece flipping device according to claim 3, characterized in that: Each clamping arm (19) has a first limiting mechanism (14) fixedly connected to the back plate (12) on both sides for limiting the clamping arm (19). The first limiting mechanism (14) includes a support (141) fixedly connected to the back plate (12), and a buffer (142) and a first limiting screw (143) are installed on the support (141).

5. The workpiece flipping device according to claim 3, characterized in that: The back plate (12) is provided with travel indicator mechanisms (20) at both ends. The travel indicator mechanism (20) includes corner brackets (201) fixedly connected to the back plate (12). Two photoelectric switches (203) are mounted on the corner brackets (201). Contact pieces (202) for alternately triggering the two photoelectric switches are installed on the clamping arm (19).

6. A workpiece flipping device according to any one of claims 3 to 5, characterized in that: A second limiting mechanism (22) is fixedly connected to one of the two clamping arms (19). The second limiting mechanism (22) includes a flange ring (224) fixedly connected to the clamping arm (19), a rotating shaft (23) located inside the flange ring (224), a limiting sleeve fixedly connected to one end of the rotating shaft (23) located inside the flange ring (224), the limiting sleeve and the rotating shaft (23) being connected by a key, a limiting block (222) fixedly connected to the limiting sleeve, a limiting rod (225) fixedly connected to the limiting block (222), and two second limiting screws (221) threadedly connected to the flange ring (224). The rotating shaft (23) drives the two ends of the limiting rod (225) to alternately strike the two second limiting screws (221).