Self-adaptive clamp

Abstract

The utility model provides a self-adaptive clamp, which belongs to the technical field of clamps and comprises three clamping jaws distributed at intervals in a ring shape. The three clamping jaws are hinged to the fixed seat, a placement part capable of moving in the linear direction is arranged on the fixed seat, the placement part comprises a placement surface, the placement surface is used for bearing a clamped product, the placement part is located at the center position of the three clamping jaws, and the placement part is hinged to the clamping jaws; wherein the three clamping jaws gradually contract inwards along with the linear movement of the bearing product pressing the placing part; the clamping device has the advantages that through the hinged structure design of the three clamping jaws which are annularly distributed at intervals and the fixed seat, and the placement part which is arranged in the center positions of the clamping jaws and can linearly move, automatic adaptive adjustment of product clamping is achieved. When a product is placed on the placing surface, the placing part moves along the linear direction along with the weight of the product or the external force, and the movement triggers the clamping jaws to synchronously contract inwards, so that the stable clamping of the product is realized.

Description

Technical Field

[0001] This utility model belongs to the field of clamping technology, and in particular relates to an adaptive clamp. Background Technology

[0002] In modern manufacturing and precision testing, fixtures serve as crucial auxiliary devices for fixing, positioning, or supporting workpieces, and their performance directly impacts machining accuracy, inspection quality, and production efficiency. Especially in applications requiring high positioning accuracy, such as 3D scanning, automated assembly, and robotic gripping, traditional fixed or manually adjustable fixtures, lacking adaptability, struggle to meet the diverse clamping needs of various products.

[0003] Existing fixture structures mostly employ rigid clamping methods, typically relying on manual adjustment or pneumatic / electric drive systems to achieve clamping. However, these fixtures generally suffer from problems such as complex structure, slow response speed, and poor adaptability. When dealing with products with irregular shapes and significant size variations, frequent fixture changes or tedious manual adjustments are often required, which not only reduces work efficiency but may also affect measurement or machining accuracy due to unstable clamping. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing an adaptive clamping fixture.

[0005] The objective of this utility model can be achieved through the following technical solution: an adaptive clamp, comprising:

[0006] Three ring-shaped, spaced-apart grippers;

[0007] A fixed base is provided, and the three grippers are hinged to the fixed base. The fixed base is provided with a placement part that can move in a straight line. The placement part includes a placement surface for supporting and holding the product. The placement part is located at the center of the three grippers and is hinged to the grippers.

[0008] As the product-bearing and pressing placement part moves linearly, the three grippers gradually retract inward.

[0009] In one of the adaptive fixtures described above, the placement part moves linearly along the vertical direction.

[0010] In the aforementioned adaptive clamp, the fixed seat is provided with at least two ratchet portions, the ratchet portions extend along the moving direction of the placement portion, the side of the placement portion engages with the ratchet on the ratchet portion, the first end of the ratchet portion is connected to the fixed seat, and the second end of the ratchet portion is a movable end.

[0011] In the aforementioned adaptive clamp, the fixed base is provided with an abutment seat, and an abutment elastic member is provided between the ratchet portion and the abutment seat. The abutment elastic member is in a compressed and energy-storing state, and the first end of the ratchet portion can move linearly relative to the fixed base.

[0012] In the aforementioned adaptive clamp, the fixed base is provided with a moving groove, the first end of the ratchet is located in the moving groove, and the first end of the ratchet can slide relative to the moving groove.

[0013] In one of the adaptive clamps described above, the abutting elastic member is disposed near the first end of the ratchet portion.

[0014] In the aforementioned adaptive clamp, a reset abutment is provided inside the fixed base. The reset abutment includes an abutment cone surface. There is a gap between the abutment cone surface and the fixed base to form an active space. The first end of the ratchet portion abuts against the abutment cone surface. An operating part is provided on the fixed base and is driven to connect with the reset abutment to drive the reset abutment to perform reset movement.

[0015] In one of the adaptive clamps described above, the operating part includes an operating lever, which is fixed to the reset abutment member and hinged to the fixed base.

[0016] In the aforementioned adaptive clamp, the fixed base is provided with a mounting groove, the operating rod is disposed in the mounting groove, and a connecting shaft is provided in the mounting groove to connect with the operating rod, so as to realize the hinged arrangement between the operating rod and the fixed base.

[0017] In the aforementioned adaptive clamp, a mounting rod is provided on the fixed base, a first hinge rod is fixedly provided on the gripper and hinged to the mounting rod, and a second hinge rod is hinged to the first hinge rod and hinged to the placement part.

[0018] Compared with existing technologies, the advantages of this invention are as follows: Through the hinged structure design of three annularly spaced grippers and a fixed base, combined with a linearly movable placement part located at the center of the grippers, automatic adaptive adjustment for product clamping is achieved. When the product is placed on the placement surface, the placement part moves in a straight line due to the product's weight or external force. This movement triggers the grippers to retract inward synchronously, thus achieving stable clamping of the product. The adaptive tightening action of the grippers can be completed without an additional driving device. The structure is simple, the response is sensitive, and it effectively improves the compatibility and clamping reliability of the fixture for products of different sizes. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 2 yes Figure 1 One of the schematic diagrams of the cross-sectional structure;

[0021] Figure 3 yes Figure 1 One of the schematic diagrams of the cross-sectional structure;

[0022] Figure 4 This is a three-dimensional structural diagram of the fixing base in this utility model.

[0023] In the figure, the gripper is 100; the mounting rod is 101; the first hinge rod is 102; the second abutment rod is 103; the retaining ring is 104; the fixing seat is 200; the placement part is 201; the placement surface is 202; the ratchet part is 203; the reset abutment part is 204; the abutment cone surface is 205; the inclined abutment surface is 206; the operating rod is 207; the mounting groove is 208; the guide sleeve is 209; the guide rod is 210; the guide post is 211; the abutment seat is 300; the abutment elastic element is 301; the moving groove is 302; and the limiting rod is 303. Detailed Implementation

[0024] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0025] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0026] like Figures 1-4 As shown, an adaptive clamp includes:

[0027] Three ring-shaped, spaced-apart grippers 100;

[0028] The fixed base 200 has three grippers 100 hinged to it, and the fixed base 200 has a placement part 201 that can move in a straight line. The placement part 201 includes a placement surface 202 for supporting and holding the product. The placement part 201 is located at the center of the three grippers 100 and is hinged to the grippers 100.

[0029] As the product-bearing pressing and placing part 201 moves linearly, the three grippers 100 gradually retract inward.

[0030] In this embodiment, the hinged structure of three annularly spaced grippers 100 and the fixed base 200, combined with a linearly movable placement part 201 located at the center of the grippers 100, achieves automatic adaptive adjustment for product clamping. When the product is placed on the placement surface 202, the placement part 201 moves in a straight line due to the weight of the product or external force. This movement triggers the grippers 100 to retract inward synchronously, thereby achieving stable clamping of the product. The adaptive tightening action of the grippers 100 can be completed without an additional driving device. The structure is simple, the response is sensitive, and the compatibility and clamping reliability of the fixture for products of different sizes are effectively improved.

[0031] It is worth mentioning that the gripper 100 is made of flexible materials, such as silicone, rubber, TPU (thermoplastic polyurethane), which gives it a certain degree of deformation ability during the clamping process and allows it to better fit the workpiece surface.

[0032] Furthermore, the placement part 201 moves linearly in the vertical direction. When the clamped product is placed on the placement surface 202 of the placement part 201, the product's gravity causes the placement part 201 to move downward in the vertical direction. Through mechanical linkage, the three grippers 100 simultaneously retract inward, thereby achieving automatic centering and stable clamping of the product.

[0033] What's special is that when the external force is withdrawn, the clamp can still maintain a stable clamping state even relying solely on the product's own weight.

[0034] It should be noted that when the product's own weight is insufficient to press down the placement part 201, external force can be applied manually; a guide sleeve 209 is fixedly installed on the fixed base 200, and a guide rod 210 is installed on the placement part 201. The guide rod 210 extends into the guide sleeve 209 and can slide relative to the guide sleeve 209.

[0035] Further specified, the fixed base 200 is provided with at least two ratchet portions 203, the ratchet portions 203 extend along the moving direction of the placement portion 201, the side of the placement portion 201 engages with the ratchet on the ratchet portion 203, the first end of the ratchet portion 203 is connected to the fixed base 200, and the second end of the ratchet portion 203 is a movable end.

[0036] In this embodiment, the ratchet structure allows the placement part 201 to move freely in only one direction (i.e., downwards), but prevents it from moving in the opposite direction (i.e., upwards). When the placement part 201 moves downwards vertically due to the product's own weight or external force, the side of the placement part 201 engages with the ratchet teeth of the ratchet part 203, ensuring that once the placement part 201 reaches a certain position, it will not return to its original position due to lack of external support. This allows the product to maintain a stable clamping state even after the external force is withdrawn, avoiding unnecessary up-and-down floating.

[0037] Preferably, the fixed base 200 is provided with an abutment seat 300, and an abutment elastic member 301 is provided between the ratchet portion 203 and the abutment seat 300. The abutment elastic member 301 is in a compressed and energy-storing state, and the first end of the ratchet portion 203 can move linearly relative to the fixed base 200.

[0038] In this embodiment, the first end of the ratchet 203 has a certain range of linear movement capability. Combined with the elastic element, this allows the clamp to achieve flexible contact with products of different heights or shapes, avoiding positioning deviations or product damage caused by rigid impacts. This improves the clamp's adaptability to complex workpieces and its clamping reliability. The presence of the elastic element enhances the meshing pressure between the ratchet 203 and the placement part 201, ensuring a consistently good meshing state and preventing tooth disengagement or slippage due to vibration or external disturbances. This further improves the stability and safety of the clamping process.

[0039] Further, the fixed base 200 is provided with a moving groove 302, the first end of the ratchet 203 is located in the moving groove 302, and the first end of the ratchet 203 can slide relative to the moving groove 302.

[0040] In this embodiment, by providing a movable groove 302 on the fixed base 200, the first end of the ratchet 203 is allowed to slide in the groove, so that the entire ratchet structure can be finely adjusted according to the actual needs of the placement part 201 and the product, thereby improving the adaptability of the fixture to workpieces of different sizes and shapes and ensuring stability and reliability during the clamping process.

[0041] The design of the moving groove 302 provides a clear movement trajectory for the ratchet 203, ensuring the consistency and accuracy of its sliding direction.

[0042] Furthermore, the elastic member 301 is positioned at the first end near the ratchet portion 203. This allows the elastic force to be applied more concentratedly to the root region of the ratchet portion 203, improving the tightness of the engagement between it and the placement portion 201, and effectively preventing tooth dislodgement caused by vibration or external disturbance.

[0043] It is worth mentioning that a limiting rod 303 is provided on the ratchet part 203, and an abutment groove is provided on the abutment seat 300. One end of the abutment elastic member 301 is sleeved on the limiting rod 303, and the other end extends into the abutment groove.

[0044] Preferably, a reset abutment 204 is provided inside the fixed base 200. The reset abutment 204 includes an abutment cone surface 205. There is a gap between the abutment cone surface 205 and the fixed base 200 to form a movable space. The first end of the ratchet portion 203 abuts and connects with the abutment cone surface 205. An operating part is provided on the fixed base 200 and is driven to connect with the reset abutment 204 to drive the reset abutment 204 to perform reset movement.

[0045] In this embodiment, when it is necessary to replace or remove the workpiece, force is applied to the operating part to drive the reset abutment 204 to move. The abutment cone surface 205 on the reset abutment 204 moves and pushes the ratchet part 203 to move and reset to the initial position in the moving groove 302, so that the placement part 201 disengages from the meshing state with the ratchet part 203.

[0046] It is worth mentioning that the first end of the ratchet 203 is provided with an inclined abutment surface 206, and the straight length of the inclined abutment surface 206 is greater than the straight length of the abutment cone surface 205. The design of the inclined abutment surface 206 increases the contact area with the reset abutment member 204, allowing the ratchet 203 to obtain a more uniform pressure distribution under force. During the process of the abutment elastic member 301 pushing the ratchet 203 to reset, the longer inclined abutment surface 206 can form a stable sliding fit with the reset abutment member 204, ensuring the smooth progress of the reset action and avoiding jamming or displacement.

[0047] Further defining the operating unit, the operating part includes an operating lever 207, which abuts against a reset abutment 204. The operating lever 207 is hinged to the fixed base 200, and the reset abutment 204 can only move in a straight line. The operating lever 207 and the fixed base 200 abut against each other, forming a lever structure, so that the operator or external drive device only needs to apply a small force to drive the reset abutment 204 to move linearly, thereby pushing the ratchet 203 outward and disengaging the ratchet 203 from the placement part 201.

[0048] It is worth mentioning that there are two ratchet parts 203, which are symmetrically arranged on both sides of the operating lever 207; a guide post 211 is fixedly provided on the reset abutment 204, passing through the fixed seat 200, and the guide post 211 slides with the fixed seat 200.

[0049] Further specifying, the fixed base 200 is provided with a mounting groove 208, the operating lever 207 is disposed in the mounting groove 208, and a connecting shaft is provided in the mounting groove 208 to connect with the operating lever 207, so as to realize the hinged setting between the operating lever 207 and the fixed base 200. The mounting groove 208 provides a fixed movement trajectory for the operating lever 207, ensuring that it maintains a stable rotation path during use.

[0050] It should be noted that the upper end of the mounting slot 208 is provided with an opening to facilitate the application of force to the operating lever 207.

[0051] Specifically, the mounting base 200 is provided with a mounting rod 101, the gripper 100 is fixedly provided with a first hinge rod 102 which is hinged to the mounting rod 101, and the first hinge rod 102 is hinged to a second hinge rod 103 which is hinged to the placement part 201.

[0052] It should be noted that the first hinge rod 102 and the mounting rod 101, and the second hinge rod 103 and the placement part 201 are all hinged by hinge shafts, and the hinge shaft is detachably provided with a retaining ring 104, so that the hinge shaft can be removed and the gripper 100 can be replaced.

[0053] It is worth mentioning that a vision sensor can be installed on the placement part 201 and a pressure sensor can be installed on the gripper 100. Both the vision sensor and the pressure sensor are connected to the control module. The vision sensor monitors the scanned object in real time and automatically adjusts the position and posture of the clamping unit according to the shape, size and other information of the scanned object to achieve precise clamping and positioning of the scanned object.

[0054] It should be noted that in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0055] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0056] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An adaptive clamp, characterized in that, include: Three ring-shaped, spaced-apart grippers; A fixed base is provided, and the three grippers are hinged to the fixed base. The fixed base is provided with a placement part that can move in a straight line. The placement part includes a placement surface for supporting and holding the product. The placement part is located at the center of the three grippers and is hinged to the grippers. As the product-bearing and pressing placement part moves linearly, the three grippers gradually retract inward.

2. The adaptive clamp according to claim 1, characterized in that, The placement part moves in a straight line along the vertical direction.

3. The adaptive clamp according to claim 1, characterized in that, The fixed base is provided with at least two ratchet portions, which extend along the moving direction of the placement portion. The side of the placement portion engages with the ratchet on the ratchet portion. The first end of the ratchet portion is connected to the fixed base, and the second end of the ratchet portion is a movable end.

4. An adaptive clamp according to claim 3, characterized in that, The fixed base is provided with an abutment seat, and an abutment elastic member is provided between the ratchet portion and the abutment seat. The abutment elastic member is in a compressed and energy-storing state, and the first end of the ratchet portion can move linearly relative to the fixed base.

5. An adaptive clamp according to claim 4, characterized in that, The fixed base is provided with a movable groove, the first end of the ratchet is located in the movable groove, and the first end of the ratchet can slide relative to the movable groove.

6. An adaptive clamp according to claim 4, characterized in that, The abutting elastic member is disposed at its first end near the ratchet portion.

7. An adaptive clamp according to claim 3 or 4, characterized in that, The fixed base is provided with a reset abutment, which includes an abutment cone surface. There is a gap between the abutment cone surface and the fixed base to form a movable space. The first end of the ratchet portion abuts against the abutment cone surface. The fixed base is provided with an operating part that is driven to the reset abutment to drive the reset abutment to reset.

8. An adaptive clamp according to claim 7, characterized in that, The operating part includes an operating lever that abuts against the reset abutment, and the operating lever is hinged to the fixed base. The reset abutment can only move in a straight line.

9. An adaptive clamp according to claim 8, characterized in that, The fixed base is provided with a mounting groove, the operating rod is disposed in the mounting groove, and a connecting shaft is provided in the mounting groove to connect the operating rod, so as to realize the hinged connection between the operating rod and the fixed base.

10. An adaptive clamp according to claim 1, characterized in that, The mounting base is provided with a mounting rod, and the gripper is fixedly provided with a first hinge rod that is hinged to the mounting rod. The first hinge rod is hinged to a second hinge rod that is hinged to the placement part.

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