Self-locking gripper

Abstract

The utility model relates to packing machinery technical field discloses a kind of self-locking clamping jaw, clamping jaw includes bottom plate, support block, rotating block, extension rod and clamping mechanism, its core is provided with a set of self-locking mechanism, the self-locking mechanism includes the movable rod slidable setting on support block and the pull spring connected on it;Through external drive to make movable rod push rotating block rotate, to drive extension rod to contract inwards to provide condition for opening bag mouth, movable rod is continuously pulled by pull spring after moving to exert lasting pull to stabilize its position, realize the self-locking of bag mouth open state.The utility model is also provided with two-way screw rod for quickly adjusting clamping width, and clamping mechanism adopts spring force self-locking clamping.The design solves the technical problem that soft bag bag mouth is difficult to open and keep stable, with high degree of automation, stable and reliable working state, easy to adjust, strong universality and other beneficial effects.

Description

Technical Field

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

[0002] In automated production lines in the food and chemical industries, automatic filling machines are commonly used to fill materials into flexible filling bags. During the filling process, clamping devices are usually used to hold the filling bags in place to facilitate subsequent filling operations.

[0003] While existing clamping devices can clamp and secure both sides of the filling bag, for filling bags made of soft materials, the bag opening often remains closed or semi-closed after clamping due to the material's properties. This severely hinders the entry of the filling head, affecting filling efficiency and even causing material spillage, resulting in waste and production line contamination. To address this issue, some grippers are designed with mechanisms to open the bag opening; however, these mechanisms often struggle to maintain the open state stably after opening. Under the high-frequency operation and equipment vibration of automated production lines, the opened bag opening is prone to angle changes or even retraction, leading to instability in the filling process. This places higher demands on the stability and reliability of the mechanism.

[0004] Therefore, this utility model proposes a self-locking gripper to overcome the shortcomings of the prior art. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a self-locking gripper, which aims to improve the problems of existing self-locking grippers that make it difficult to stably open the bag opening to cooperate with automated filling after clamping soft packaging bags, and that they have limited functionality and cannot be compatible with packaging bags of different sizes.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A self-locking gripper includes: a base plate, a support block, a rotating block, an extension rod, a clamping mechanism, a rotating shaft; and a self-locking mechanism.

[0007] The support block has a circular hole, and the self-locking mechanism includes a movable rod that is slidably disposed in the circular hole, and a tension spring for stabilizing the position of the movable rod.

[0008] Furthermore, the moving rod of the self-locking mechanism is adapted to push the rotating block to rotate, and the tension spring is connected between the moving rod and the support block. This combination combines linear drive and rotational output, and uses an elastic element for position locking.

[0009] Preferably, the self-locking gripper further includes an L-shaped block and a locking block. The L-shaped block is rotatably mounted on the support block and is used to drive the locking block. The locking block abuts against the moving rod to push it to move.

[0010] Preferably, the movable rod engages with the rotating block via a fixing screw, thereby transmitting and pushing force.

[0011] Preferably, a bearing is fitted onto the fixing screw, and the bearing forms rolling contact with the side wall of the rotating block to reduce rotational friction.

[0012] Preferably, the clamping mechanism includes a fixed shaft, a clamping block, a movable rod, a connecting rod, and a spring. The clamping block is rotatably mounted on the fixed shaft, the movable rod is slidably disposed within the extension rod, and is connected to the clamping block via the connecting rod. In the default state, the spring drives the movable rod to clamp the clamping block.

[0013] Preferably, the clamping mechanism further includes a fixing ring and a push block, one end of the spring abutting against the fixing ring, and the push block being connected to the movable rod for receiving external driving force to open the clamping block.

[0014] Preferably, the self-locking gripper further includes a slide rail, a connecting block, and a bidirectional lead screw. The support block is fixed to the base plate, the connecting block slides with the slide rail and is threaded with the bidirectional lead screw to adjust the distance between the two extension rods.

[0015] Preferably, the connecting block is slidably connected to the slide rail via a slider provided at its bottom to achieve smoother movement.

[0016] This utility model has the following beneficial effects: 1. In this utility model, by setting a self-locking mechanism, the self-locking mechanism transforms the external linear motion into the synchronous contraction action of the two extension rods through the linkage between the moving rod and the rotating block. This solves the problem that the grippers in the prior art have difficulty opening the mouth of soft filling bags, and achieves the technical effect of being able to stably open the bag mouth and maintain this state. This greatly facilitates the subsequent automated filling operation and improves the automation level and reliability of the production line.

[0017] 2. In this utility model, by setting a width adjustment component consisting of a bidirectional lead screw, a slide rail and a connecting block, the problem of the existing gripper device having a single structure and being difficult to be compatible with packaging bags of different specifications is solved. This achieves the technical effect of being able to quickly, conveniently and synchronously adjust the distance between the two gripping mechanisms, making the device more versatile and flexible, and shortening the debugging time when changing product specifications.

[0018] 3. In this utility model, by setting a tension spring in the self-locking mechanism to fix the position of the moving rod, the problem of the bag opening shaking or retracting due to equipment vibration when it is open is solved, and the technical effect of stabilizing and locking the opening angle of the bag opening is achieved, ensuring the stability and accuracy of the filling process.

[0019] 4. In this utility model, by designing a clamping mechanism composed of a spring, a movable rod and a clamping block, the spring force is used to achieve a normally closed clamping of the filling bag, which solves the problem of high energy consumption and poor reliability caused by some clamps needing to continuously provide power to maintain the clamping force. It achieves the technical effect of self-locking clamping action, energy saving, and ensuring that the clamped object will not fall off in the event of power failure or other accidents, thus improving the safety of the equipment. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of a self-locking gripper proposed in this utility model; Figure 2 This is a schematic diagram of the structure of a connecting block for a self-locking gripper proposed in this utility model; Figure 3 This is a schematic diagram of the slider of a self-locking gripper proposed in this utility model; Figure 4 This is a schematic diagram of the self-locking mechanism of a self-locking gripper proposed in this utility model; Figure 5 This is a cross-sectional schematic diagram of a self-locking gripper clamping mechanism proposed in this utility model. Figure 6 This is a schematic diagram of the push block of a self-locking gripper proposed in this utility model.

[0021] Legend: 1. Base plate; 2. Support block; 3. Slide rail; 4. Rotating block; 5. Extension rod; 6. Slider; 7. Self-locking mechanism; 701. L-shaped block; 702. Locking block; 703. Tension spring; 704. Fixing screw; 705. Moving rod; 706. Bearing; 707. Round hole; 8. Clamping mechanism; 801. Fixed shaft; 802. Clamping block; 803. Connecting rod; 804. Fixed ring; 805. Moving rod; 806. Spring; 807. Push block; 9. Connecting block; 10. Two-way lead screw; 11. Rotating shaft. Detailed Implementation

[0022] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0023] Example: Please refer to Figures 1 to 6This utility model provides a self-locking gripper, which aims to solve the problems of existing grippers used for holding soft filling bags, which are usually difficult to open the bag opening stably, and the adjustment mechanism for compatibility with different packaging bags is complex and inefficient.

[0024] like Figures 1-3 As shown, the self-locking gripper includes a base plate 1 serving as a mounting base, and a width adjustment assembly and a clamping assembly disposed on the base plate 1. The width adjustment assembly includes a slide rail 3 fixedly connected to the base plate 1 and a bidirectional lead screw 10 rotatably mounted on a support block 2. The width adjustment assembly also includes at least two connecting blocks 9 slidably connected to the slide rail 3 via sliders 6. The connecting blocks 9 are threadedly engaged with the bidirectional lead screw 10. Rotating the bidirectional lead screw 10 can drive the two connecting blocks 9 to move synchronously towards or away from each other along the length direction of the slide rail 3. The clamping assembly is fixed to the connecting blocks 9 and moves together with the connecting blocks 9. The clamping assembly includes at least two rotating blocks 4, which rotate on the top of the connecting blocks 9. One end of the extension rod 5 is fixedly connected to the rotating block 4, and the other end of the extension rod 5 is provided with a clamping mechanism 8. The self-locking gripper also includes a self-locking mechanism 7, which is disposed on the support block 2 and used to drive the rotating blocks 4 to rotate, thereby adjusting the included angle between the two extension rods 5 to provide conditions for the subsequent bag opening mechanism to open the bag opening fixed by the clamping mechanism 8.

[0025] To solve the above-mentioned technical problems, the core of the technical solution of this embodiment is that the self-locking mechanism 7 of the self-locking gripper achieves driving and stable locking of the extension rod 5 retraction angle through a specific structural cooperation and connection relationship.

[0026] Please refer to the following carefully. Figure 1 and Figure 4 The core structure of the self-locking mechanism 7 will be described in detail below: The top of the support block 2 has a through circular hole 707. The self-locking mechanism 7 includes a movable rod 705 that is slidably installed in the circular hole 707. A fixing screw 704 is fixed to the movable rod 705 by means of a threaded connection. The end of the fixing screw 704 contacts and engages with the side wall of the rotating block 4. When the movable rod 705 slides along the axial direction of the circular hole 707, the fixing screw 704 moves synchronously and pushes the rotating block 4 to rotate around the rotating shaft 11. In order to reduce the frictional resistance during rotation, a bearing 706 that rolls in contact with the side wall of the rotating block 4 is also sleeved on the fixing screw 704. The self-locking mechanism 7 also includes a tension spring 703 for maintaining the position of the movable rod 705 after it is positioned. One end of the tension spring 703 is fixed to the movable rod 705, and the other end is fixed to the support block 2. The tension spring 703 applies a continuous tension force to the movable rod 705 after it moves to prevent it from shifting due to factors such as equipment vibration, and ensures that the angle between the extension rods 5 is constant.

[0027] The self-locking mechanism 7 also includes a drive assembly for driving the movement of the moving rod 705. The drive assembly includes an L-shaped block 701 and a locking block 702. The L-shaped block 701 is rotatably disposed on the top of the support block 2. One end of the locking block 702 is rotatably connected to the L-shaped block 701, and the other end abuts against the end of the moving rod 705. When the L-shaped block 701 is driven to rotate by external power, the L-shaped block 701 drives the locking block 702 to push the moving rod 705 to achieve precise reciprocating linear motion within the circular hole 707. This linkage structure of the L-shaped block 701, the locking block 702, and the moving rod 705 effectively transmits and converts the external driving force into the linear motion of the retractable extension rod 5, providing conditions for the subsequent opening of the bag opening.

[0028] Based on the above embodiments, the present invention may further include the following preferred technical solutions: As a preferred embodiment, to achieve reliable clamping and automatic tightening of the filling bag, please refer to... Figure 4 The internal structure of the clamping mechanism 8 is precisely designed. The extension rod 5 has a cavity inside. The clamping mechanism 8 includes a movable rod 805 that is slidably installed in the cavity. A spring 806 and a fixing ring 804 for limiting the position of the spring 806 are sleeved on the outer periphery of the movable rod 805. The fixing ring 804 is engaged in the cavity. One end of the spring 806 abuts against the fixing ring 804, and the other end abuts against the flange of the movable rod 805. The end of the movable rod 805 is also connected to a push block 807. The clamping mechanism 8 also includes a fixed shaft 801 that is rotatably installed at the end of the extension rod 5, and a clamping block 802 that can rotate around the fixed shaft 801. The front end of the movable rod 805 is connected to the clamping block 802 through a connecting rod 803. In the default state, the spring 806 is in a compressed state and provides continuous elastic force. Through the movable rod 805 and the connecting rod 803, the clamping block 802 is driven to be in a tightened clamping state, thereby using the elastic force to achieve self-locking of the clamping.

[0029] As another preferred embodiment, to accommodate filling bags of different widths and achieve rapid adjustment, please refer to... Figure 1 and Figure 2 At least one slide rail 3 is fixed parallel to the base plate 1. A slider 6 is fixed to the bottom of the connecting block 9. The slider 6 slides with the slide rail 3, so that the connecting block 9 can move smoothly along the slide rail 3. A bidirectional lead screw 10 is rotatably set on the support block 2. The body of the bidirectional lead screw 10 has two threads with opposite directions. The two connecting blocks 9 are respectively provided with threaded holes that mate with the two threads. By rotating the bidirectional lead screw 10, the two connecting blocks 9 and the entire clamping assembly above them can be driven to move closer or further away synchronously, thereby quickly adjusting the overall width of the gripper. This structure is precise in adjustment and convenient in operation.

[0030] When it is necessary to clamp filling bags of different sizes, first rotate the bidirectional screw 10. The bidirectional screw 10 drives the two connecting blocks 9 to move towards or away from each other along the slide rail 3 through its two threads with opposite directions, thereby quickly adjusting the distance between the two clamping mechanisms 8 to the appropriate position. When clamping the filling bag, the external drive device pushes the push block 807 of the clamping mechanism 8. The push block 807 drives the movable rod 805 to slide inside the extension rod 5 and compress the spring 806. The movable rod 805 pushes the clamping block 802 to rotate around the fixed shaft 801 and open through the connecting rod 803. After the filling bag is placed between the clamping block 802 and the extension rod 5, the external drive device removes the power, the compressed spring 806 rebounds, and pushes the movable rod 805 back to reset through the fixed ring 804, thereby driving the clamping block 802 to tighten. The continuous pressure of the spring 806 firmly clamps the filling bag. After the filling bag is clamped, when it is necessary to open the bag opening, the external drive device drives the L-shaped block 701 of the self-locking mechanism 7 to rotate. The L-shaped block 701 pushes the moving rod 705 to move linearly in the round hole 707 through the locking block 702. The fixing screw 704 and bearing 706 on the moving rod 705 move accordingly and push the two rotating blocks 4 to rotate inward around their respective rotating shafts 11. Since the extension rod 5 is fixedly connected to the rotating block 4, the rotation of the rotating block 4 causes the clamping ends of the two extension rods 5 to retract inward, thereby facilitating the subsequent bag opening mechanism to open the bag opening. At this time, the tension spring 703 applies a continuous tension to the moving rod 705 to lock its position, ensuring that the bag opening can be stably kept open during the filling process. Through the synergistic effect of the self-locking mechanism 7 and the clamping mechanism 8, this utility model effectively solves the problem of soft bag clamping and opening in automated filling.

Claims

1. A self-locking gripper, comprising: Base plate (1); A support block (2) is fixed on the base plate (1), and a circular hole (707) is provided on the support block (2). The rotating block (4) is rotatably connected to the connecting block (9) via the rotating shaft (11). An extension rod (5) is fixedly connected at one end to the rotating block (4); A clamping mechanism (8) is provided at the other end of the extension rod (5); Its features are, The self-locking gripper also includes a self-locking mechanism (7), which includes a movable rod (705) slidably disposed in the circular hole (707), and the movable rod (705) is adapted to push at least two of the rotating blocks (4) to rotate synchronously; The self-locking mechanism (7) also includes a tension spring (703), which is connected between the moving rod (705) and the support block (2) and is used to apply tension to the moving rod (705) after it moves to stabilize its position.

2. The self-locking gripper according to claim 1, characterized in that: The self-locking mechanism (7) further includes an L-shaped block (701) and a locking block (702); the L-shaped block (701) is rotatably disposed on the support block (2) and is used to drive the locking block (702), the locking block (702) abuts against the moving rod (705) to push it to move.

3. The self-locking gripper according to claim 1, characterized in that: The movable rod (705) is provided with a fixing screw (704), which is in contact with the rotating block (4) to push the rotating block (4) to rotate when the movable rod (705) moves.

4. A self-locking gripper according to claim 3, characterized in that: A bearing (706) is fitted on the fixing screw (704), and the bearing (706) makes rolling contact with the rotating block (4).

5. A self-locking gripper according to claim 1, characterized in that: The clamping mechanism (8) includes: A fixed shaft (801) is provided on the extension rod (5); The clamping block (802) is rotatably mounted on the fixed shaft (801); The movable rod (805) is slidably disposed within the extension rod (5); A connecting rod (803) is connected between the movable rod (805) and the clamping block (802); A spring (806) is sleeved on the movable rod (805) and is used to drive the movable rod (805) in the default state and to clamp the clamping block (802) through the connecting rod (803).

6. A self-locking gripper according to claim 5, characterized in that: The clamping mechanism (8) further includes a fixed ring (804) and a push block (807); one end of the spring (806) abuts against the fixed ring (804), and the push block (807) is connected to the movable rod (805) for being pushed by an external driving force to compress the spring (806) by the movable rod (805).

7. A self-locking gripper according to claim 1, characterized in that: The self-locking gripper also includes a slide rail (3), a connecting block (9) slidably disposed on the slide rail (3), and a bidirectional lead screw (10); the slide rail (3) is located on the rear side of the support block (2), and the bidirectional lead screw (10) is threadedly engaged with the connecting block (9) to adjust the distance between the two extension rods (5).

8. A self-locking gripper according to claim 7, characterized in that: The connecting block (9) is provided with a slider (6), which is slidably connected to the slide rail (3).

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