A fixture device for a machining industrial robot

Abstract

This invention discloses a clamping device for machining industrial robots, belonging to the field of machining clamps. The clamping device for machining industrial robots includes a base with multiple first positioning screws threaded onto the base. An adjusting disc is provided at the head of each first positioning screw, and the distance between the adjusting disc and the first positioning screw is adjustable. Multiple torque limiting components are evenly distributed between the adjusting disc and the first positioning screws to provide torque protection when the first positioning screws clamp the workpiece. The torque limiting components include a connecting rod fixed to the adjusting disc, a push block inserted into the connecting rod, and an elastic element sleeved on the connecting rod. Multiple stops are fixed to the first positioning screws, and one side of each push block is beveled. This invention, through the cooperative structure of the push block, stop block, elastic element, and external rotating ring, achieves slippage and overload protection. Operators can detect the slippage state and stop operation in time, effectively preventing workpiece damage due to excessive clamping force.

Description

Technical Field

[0001] This invention relates to the field of machining fixtures, and particularly to a fixture device for machining industrial robots. Background Technology

[0002] With the continuous advancement of technology, fixtures are playing an increasingly important role in industrial manufacturing. They not only ensure the safety and stability of products during processing but also improve processing efficiency and product quality. In the production and processing of industrial robots, fixture devices are used to fix the robotic arm and base to the workpiece awaiting processing, ensuring that the workpiece maintains a stable position and posture during processing (such as grinding, polishing, welding, drilling, milling, etc.). Traditional fixture devices mostly use a screw-driven clamping block to hold and position the workpiece, with the operator applying clamping force by rotating the screw.

[0003] When operators clamp workpieces using a rotating screw, they typically rely on feel or experience to judge whether the clamping force is sufficient. The lack of structures to facilitate operator identification of clamping force leads to poor controllability of the clamping force. Excessive clamping force can easily cause indentations, localized deformation, or even structural damage to the workpiece surface, with particularly significant effects on thin-walled parts or precision-machined surfaces. Conversely, insufficient clamping force may cause workpiece displacement or vibration during machining, affecting machining accuracy. This difficulty in controlling clamping force is especially prominent in mass production, as differences in operator experience can lead to inconsistent clamping forces, thus affecting the stability of product processing quality. Summary of the Invention

[0004] This invention provides a clamping device for processing industrial robots, which can solve the problem in the prior art that the operating screw clamps the workpiece, making it inconvenient to control the clamping force.

[0005] A clamping device for processing industrial robots includes a base, on which a plurality of first positioning screws are threadedly connected. An adjusting plate is provided at the head of each first positioning screw. The distance between the adjusting plate and the first positioning screw is adjustable. A plurality of torque limiting components are evenly provided between the adjusting plate and the first positioning screw for torque protection when the first positioning screw clamps the workpiece. The torque limiting component includes a connecting rod fixed on the adjusting plate, a push block inserted into the connecting rod, and an elastic element sleeved on the connecting rod. Multiple stops are fixed on the first positioning screw. One side of each push block is set as an inclined surface, which can slide in contact with the push block. An outer rotating ring is sleeved on the outer side of the head of the first positioning screw. Multiple push plates are uniformly fixed on the inner wall of the outer rotating ring. The push block is connected to the adjacent push plate.

[0006] Preferably, an adjusting screw is fixed on the first positioning screw, the adjusting disc is sleeved on the adjusting screw, and a knob threaded to the adjusting screw is provided on one side of the adjusting disc.

[0007] Preferably, a guide post is fixed on the push block, and the push plate slides in contact with the guide post.

[0008] Preferably, an inner rotating ring is fixedly mounted on the inner side of the outer rotating ring via multiple connecting plates, and a push plate that slides in contact with the guide post is also fixedly mounted on the inner rotating ring.

[0009] Preferably, a plurality of limiting screws are fixed on the base, and a pressure block is inserted into the limiting screw. A second positioning screw is inserted through the pressure block. One end of the second positioning screw is fixedly connected to the base. A second nut is threaded onto the limiting screw, and a first nut is threaded onto the second positioning screw. The first nut and the second nut are located on opposite sides of the pressure block.

[0010] Preferably, a connecting sleeve is fixedly provided at one end of the first nut, a push rod is slidably provided on the connecting sleeve, an indicator block is fixedly provided at one end of the push rod, the indicator block is embedded in the outer surface of the connecting sleeve, and a second spring is sleeved on the push rod.

[0011] Preferably, a rotating plate is rotatably connected to the other end of the push rod, and an abutment plate that can contact the end of the second positioning screw is fixed on the rotating plate.

[0012] Preferably, the adjusting screw has a hollow structure in the middle and is provided with a scale tube. The adjusting screw has symmetrical guide grooves, and each guide groove is slidably connected to a connecting block. The two ends of the connecting block are respectively fixedly connected to the scale tube and the adjusting plate.

[0013] Preferably, the base is also threaded with a plurality of third positioning screws.

[0014] Preferably, the elastic element is a first spring or a disc spring. This invention provides a clamping device for processing industrial robots, which has the following beneficial effects: 1. By setting up a cooperative structure of push block, stop block, elastic element, and outer rotating ring, one side of the push block is set as an inclined surface and slides in contact with the stop block on the first positioning screw. When the axial component of the clamping torque exceeds the preload of the elastic element, the inclined surface of the push block slides along the stop block, and the push block retracts towards the adjusting plate against the elastic force of the elastic element, disengaging from the stop block. At this time, the outer rotating ring continues to rotate, but the first positioning screw no longer rotates, i.e., slippage occurs. The operator can sense the slippage state and stop the operation in time, effectively preventing the workpiece from being crushed or damaged due to excessive clamping force.

[0015] 2. By setting up a linkage structure for the connecting sleeve, push rod, contact plate, and indicator block, when the first nut is tightened, the connecting sleeve moves towards the base. The contact plate first contacts the end of the second positioning screw. As tightening continues, the push rod slides outward relative to the connecting sleeve, while the indicator block extends outward from the outer surface of the connecting sleeve. The operator can determine whether the current clamping point has reached the set clamping state by observing the extension of the indicator block, without relying on feel or additional measuring tools, thus avoiding excessive force when clamping the workpiece.

[0016] 3. By setting up a cooperative structure of adjusting screw, knob and scale tube, rotating the knob can change the axial position of the adjusting plate on the adjusting screw, thereby changing the pre-compression of the elastic element. The operator can directly read the currently set torque threshold according to the scale reading to realize the clamping force control of different workpieces. Attached Figure Description Figure 1 A schematic diagram of the structure of a clamping device for processing industrial robots provided by the present invention. Figure 1 ; Figure 2 A schematic diagram of the workpiece removal structure of a clamping device for processing industrial robots provided by the present invention; Figure 3 The present invention provides a clamping device for machining industrial robots. Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 A schematic diagram of the external rotating ring, scale tube, and adjusting screw structure of a clamping device for processing industrial robots provided by the present invention; Figure 5 The present invention provides a clamping device for machining industrial robots. Figure 4 A schematic diagram of the structure after removing the adjustment dial and knobs; Figure 6 The present invention provides a clamping device for machining industrial robots. Figure 4 Schematic diagram of cross-section structure; Figure 7 The present invention provides a clamping device for machining industrial robots. Figure 6 Enlarged structural diagram at point B; Figure 8 A cross-sectional view of the push block structure of a clamping device for processing industrial robots provided by the present invention; Figure 9 A cross-sectional view of the connecting sleeve structure of a clamping device for processing industrial robots provided by the present invention; Figure 10 This invention provides a schematic diagram of a clamping device for processing industrial robots, showing different workpiece clamping states.

[0017] Explanation of reference numerals in the attached figures: 100. Base; 200. First positioning screw; 201. Limiting ring; 300. Adjusting screw; 301. Adjusting disc; 302. Knob; 400. Push block; 401. Connecting rod; 402. First spring; 403. Stop block; 500. Outer rotating ring; 501. Push plate; 502. Guide post; 503. Inner rotating ring; 504. Connecting plate; 600. Scale tube; 601. Guide groove; 602. Connecting block; 700. Second positioning screw; 701. Pressure block; 702. First nut; 703. Connecting sleeve; 704. Limiting screw; 705. Push rod; 706. Indicator block; 707. Contact plate; 708. Rotating plate; 709. Second spring; 800. Third positioning screw. Detailed Implementation

[0018] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0019] like Figures 1 to 10 As shown in the figure, an embodiment of the present invention provides a clamping device for processing industrial robots, including a base 100. Multiple first positioning screws 200 are threadedly connected to the base 100 and are distributed at multiple points according to the shape of the workpiece, for clamping and positioning the workpiece from different directions. An adjusting disc 301 is provided at the head of each first positioning screw 200. The distance between the adjusting disc 301 and the first positioning screw 200 is adjustable. Specifically, an adjusting screw 300 is fixedly mounted on the first positioning screw 200, the adjusting disc 301 is sleeved on the adjusting screw 300, and a knob 302 threadedly connected to the adjusting screw 300 is provided on one side of the adjusting disc 301. Multiple torque limiting components are evenly arranged between the adjusting disc 301 and the first positioning screw 200 to protect torque when the first positioning screw 200 clamps the workpiece. The torque limiting components include a connecting rod 401 fixed on the adjusting disc 301, a push block 400 inserted into the connecting rod 401, and an elastic element sleeved on the connecting rod 401. In this embodiment, the elastic element is a first spring 402. The push block 400 can slide along the axial direction of the connecting rod 401. Multiple stops 403 are fixed on the first positioning screw 200. The number of stops 403 is the same as the number of push blocks 400, and their positions correspond one-to-one. One side of each push block 400 is set as an inclined surface, which can slide in contact with the push block 400. An outer rotating ring 500 is sleeved on the outer side of the head of the first positioning screw 200. Multiple push plates 501 are evenly fixed on the inner wall of the outer rotating ring 500. The push block 400 is connected to the adjacent push plate 501.

[0020] The axial position of the adjusting disc 301 on the adjusting screw 300 is changed by rotating the knob 302, thereby adjusting the distance between the adjusting disc 301 and the end face of the first positioning screw 200. When the adjusting disc 301 moves closer to the first positioning screw 200, the first spring 402 is further compressed, the preload increases, and the push block 400 requires a greater axial force to retract—that is, the torque threshold increases. Conversely, when the adjusting disc 301 moves away from the first positioning screw 200, the preload of the first spring 402 decreases, and the torque threshold decreases. The operator can flexibly set a suitable torque protection threshold by using the knob 302 according to the material, wall thickness, and clamping requirements of the workpiece.

[0021] Rotating the outer rotating ring 500 with a wrench causes the push block 400 to rotate via the push plate 501 and guide post 502. The inclined surface of the push block 400 pushes the stop block 403, causing the first positioning screw 200 to rotate forward and press the workpiece. When the push block 400 is under the action of the first spring 402, its inclined surface contacts the corresponding surface of the stop block 403. When the push block 400 is subjected to axial pressure, the inclined surface will slide along the surface of the stop block 403, causing the push block 400 to retract away from the adjusting disc 301 against the elastic force of the first spring 402.

[0022] By setting up a cooperative structure consisting of push block 400, stop block 403, elastic element, and outer rotating ring 500, a slippage and overload protection function is achieved. Operators can clearly sense the slippage state and stop operation in time, effectively preventing workpiece damage or crushing due to excessive clamping force.

[0023] In some specific implementation plans, such as Figure 4 , Figure 5 and Figure 6 As shown. The adjusting screw 300 has a hollow structure in the middle and is equipped with a scale tube 600. The adjusting screw 300 has symmetrical guide grooves 601. Each guide groove 601 is slidably connected to a connecting block 602. The two ends of the connecting block 602 are fixedly connected to the scale tube 600 and the adjusting plate 301, respectively.

[0024] When the knob 302 is rotated to change the position of the adjustment dial 301, the connecting block 602 drives the scale tube 600 to move synchronously. The position of the scale line on the scale tube 600 relative to the end face of the adjustment screw 300 changes, and the operator can directly read the currently set torque threshold according to the scale reading.

[0025] In some specific implementation plans, such as Figure 5 , Figure 6 and Figure 7As shown. An inner rotating ring 503 is fixed to the inner side of the outer rotating ring 500 via multiple connecting plates 504. The inner rotating ring 503 and the outer rotating ring 500 form a double-ring structure, which simultaneously pushes the push block 400 from both the inner and outer sides. A guide post 502 is fixed on the push block 400, and a push plate 501 is also fixed on the inner rotating ring 503. The push plates 501 are in sliding contact with the corresponding guide posts 502.

[0026] When the push block 400 moves along the axial direction of the connecting rod 401, the guide post 502 slides within the push plate 501. That is, when the outer rotating ring 500 rotates, it drives the push block 400 to rotate together through the push plate 501 and the guide post 502. When slippage occurs due to the corresponding torque, the push block 400 can move axially independently, avoiding frictional contact between the outer rotating ring 500 and the wrench that affects the movement of the push block 400.

[0027] In some specific implementation plans, such as Figure 3 and Figure 9 As shown. A plurality of limiting screws 704 are fixedly mounted on the base 100. A pressure block 701 is inserted into each limiting screw 704. A second positioning screw 700 is inserted through the pressure block 701. One end of the second positioning screw 700 is fixedly connected to the base 100. A second nut is threaded onto the limiting screw 704. Figure 2 (As shown in the diagram, not marked) A first nut 702 is threaded onto the second positioning screw 700. A connecting sleeve 703 is fixed to one end of the first nut 702. The first nut 702 and the second nut are located opposite each other on both sides of the pressure block 701. The distance between the pressure block 701 and the workpiece is adjusted by rotating the second nut. Tightening the first nut 702 locks the pressure block 701 in a predetermined position that is in close contact with the workpiece. A push rod 705 is slidably mounted on the connecting sleeve 703. An indicator block 706 is fixed to one end of the push rod 705. The outer surface of the indicator block 706 is decorated with a structure such as red paint for easy identification. A rotating plate 708 is rotatably connected to the other end of the push rod 705. An abutment plate 707 that can contact the end of the second positioning screw 700 is fixed on the rotating plate 708. The indicator block 706 is embedded in the outer surface of the connecting sleeve 703. A second spring 709 located on one side of the rotating plate 708 is sleeved on the push rod 705.

[0028] The distance between the contact plate 707 and the indicator block 706 is set according to the screw-in depth of the first nut 702, which represents the appropriate clamping force of the pressure block 701. When the first nut 702 is tightened, the connecting sleeve 703 moves towards the base 100. The contact plate 707 first contacts the end of the second positioning screw 700. As tightening continues, the push rod 705 slides outward relative to the connecting sleeve 703, compressing the second spring 709. At the same time, the indicator block 706 is pushed out of the groove on the outer surface by the push rod 705. The extension of the indicator block 706 is related to the screw-in depth of the first nut 702, that is, the extension of the indicator block 706 is related to the clamping force of the pressure block 701 on the workpiece. The operator can judge whether the current clamping point has reached the set clamping state by observing the extension of the indicator block 706.

[0029] In some specific implementation plans, such as Figure 2 As shown. Multiple third positioning screws 800 are also threaded onto the base 100. After the extension length of the third positioning screws 800 is pre-adjusted, they mainly serve as support points and side limiting points, working in conjunction with the first positioning screw 200 and the second positioning screw 700 to perform multi-point positioning or multi-point support for the workpiece.

[0030] In some specific implementation plans, such as Figure 6 and Figure 7 As shown. A limiting ring 201 is fixed on the first positioning screw 200, and the outer rotating ring 500 has a hexagonal nut structure and slides in contact with the limiting ring 201. The limiting ring 201 limits the push plate 501 on the outer rotating ring 500 to a position away from the head of the first positioning screw 200, so that when the push block 400 moves away from the first positioning screw 200, it drives the guide post 502 to slide on the push plate 501.

[0031] In some specific implementations, the elastic element can be a disc spring, which has the characteristics of short stroke, high stiffness, and easy assembly. Using the first spring 402 as the elastic element is suitable for conventional clamping scenarios with a large stroke and moderate requirements for torque control accuracy. Using a disc spring as the elastic element is used for heavy-duty clamping scenarios that require high stiffness and high-precision torque control.

[0032] In other specific implementation schemes, such as Figure 10 As shown. After adjusting the positions of the first positioning screw 200, the second positioning screw 700, the third positioning screw 800, and the limit screw 704 on the base 100, it can be used for clamping different parts of the robot.

[0033] To facilitate understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution will now be briefly explained in conjunction with specific application scenarios: According to the material of the workpiece and the clamping requirements, rotate the knob 302 to adjust the position of the adjustment disk 301, and read the preset torque threshold through the scale tube 600. After the workpiece is placed on the third positioning screw 800, use a wrench to rotate the outer rotating ring 500. The outer rotating ring 500 drives the push block 400 to rotate through the push plate 501 and the guide post 502. The push block 400 uses the preload of the first spring 402 to contact the stop block 403 on the first positioning screw 200 and generate a pushing force, thereby driving the first positioning screw 200 to rotate, so that the first positioning screw 200 advances in the threaded hole of the base 100, positioning and clamping the workpiece.

[0034] When the clamping torque reaches the preset threshold, the axial component of the push block 400 exceeds the preload of the first spring 402. The inclined surface of the push block 400 begins to slide along the surface of the stop block 403, and the push block 400 retracts towards the adjusting disc 301 against the elastic force of the first spring 402. The contact between the push block 400 and the stop block 403 separates, and the push block 400 can no longer transmit torque to the stop block 403. The outer rotating ring 500 continues to rotate, but the first positioning screw 200 no longer rotates—that is, "slippage" occurs. The operator can use this to judge that the appropriate clamping force has been reached and stop the operation. Accordingly, use a wrench to turn each of the first nuts 702 and observe the extension of the indicator block 706 on the second positioning screw 700 to confirm that the clamping point has reached sufficient clamping force, avoiding insufficient or excessive clamping force.

[0035] After processing, rotate the outer rotating ring 500 and the first nut 702 in the opposite direction, and the first positioning screw 200 will retract to loosen the workpiece. Remove the pressure block 701 and the workpiece can be taken off.

[0036] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A clamping device for processing industrial robots, comprising a base (100), characterized in that, The base (100) is threaded with a plurality of first positioning screws (200). An adjusting plate (301) is provided at the head of the first positioning screw (200). The distance between the adjusting plate (301) and the first positioning screw (200) is adjustable. A plurality of torque limiting components are evenly provided between the adjusting plate (301) and the first positioning screw (200) for torque protection when the first positioning screw (200) clamps the workpiece. The torque limiting component includes a connecting rod (401) fixed on the adjusting plate (301), a push block (400) inserted into the connecting rod (401), and an elastic element sleeved on the connecting rod (401). A plurality of stops (403) are fixed on the first positioning screw (200). One side of the push block (400) is set as an inclined surface, and the inclined surface can slide in contact with the push block (400). An outer rotating ring (500) is sleeved on the outer side of the head of the first positioning screw (200). A plurality of push plates (501) are uniformly fixed on the inner wall of the outer rotating ring (500). The push block (400) is connected to the adjacent push plate (501).

2. The clamping device for processing industrial robots as described in claim 1, characterized in that, An adjusting screw (300) is fixed on the first positioning screw (200), and the adjusting disc (301) is sleeved on the adjusting screw (300). A knob (302) is threadedly connected to the adjusting screw (300) on one side of the adjusting disc (301).

3. The clamping device for processing industrial robots as described in claim 2, characterized in that, The pusher block (400) is fixedly provided with a guide post (502), and the pusher plate (501) slides in contact with the guide post (502).

4. The clamping device for processing industrial robots as described in claim 3, characterized in that, An inner rotating ring (503) is fixedly mounted on the inner side of the outer rotating ring (500) through multiple connecting plates (504), and a push plate (501) that slides in contact with the guide post (502) is also fixedly mounted on the inner rotating ring (503).

5. The clamping device for processing industrial robots as described in claim 1, characterized in that, Multiple limiting screws (704) are fixed on the base (100). A pressure block (701) is inserted into the limiting screw (704). A second positioning screw (700) is inserted into the pressure block (701). One end of the second positioning screw (700) is fixedly connected to the base (100). A second nut is threaded onto the limiting screw (704). A first nut (702) is threaded onto the second positioning screw (700). The first nut (702) and the second nut are located opposite each other on both sides of the pressure block (701).

6. The clamping device for processing industrial robots as described in claim 5, characterized in that, A connecting sleeve (703) is fixedly provided at one end of the first nut (702), a push rod (705) is slidably provided on the connecting sleeve (703), an indicator block (706) is fixedly provided at one end of the push rod (705), the indicator block (706) is embedded in the outer surface of the connecting sleeve (703), and a second spring (709) is sleeved on the push rod (705).

7. The clamping device for processing industrial robots as described in claim 6, characterized in that, The other end of the push rod (705) is rotatably connected to a rotating plate (708), and the rotating plate (708) is fixed with an abutment plate (707) that can contact the end of the second positioning screw (700).

8. The clamping device for processing industrial robots as described in claim 2, characterized in that, The adjusting screw (300) has a hollow structure in the middle and is provided with a scale tube (600). The adjusting screw (300) is provided with symmetrical guide grooves (601). Each guide groove (601) is slidably connected with a connecting block (602). The two ends of the connecting block (602) are fixedly connected to the scale tube (600) and the adjusting plate (301) respectively.

9. The clamping device for processing industrial robots as described in claim 8, characterized in that, The base (100) is also threaded with a plurality of third positioning screws (800).

10. The clamping device for processing industrial robots as described in claim 8, characterized in that, The elastic element is a first spring (402) or a disc spring.

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