An annular workpiece clamping device

Abstract

The utility model relates to the technical field of clamp, concretely relates to a ring workpiece clamping device, including the rest, the rest is provided with the annular rest groove for placing the ring workpiece, is provided with the containing cavity in the rest groove in the rest, is seted up with the extension hole that communicates with the containing cavity on the rest groove side wall, is provided with the ejector rod in the extension hole, is provided with the driving part that is connected with the ejector rod in the rest, the driving part controls the ejector rod to extend the extension hole, to the ring workpiece clamping that places on the rest groove, the outside wall polishing of subsequent ring workpiece is convenient, the closed nature of this clamping device is strong, the chip that subsequent polishing ring workpiece produces probably does not enter the containing cavity, still can keep the smoothness of the ejector rod extension after long -term use, has improved the clamping stability and product surface quality.

Description

Technical Field

[0001] This utility model relates to the field of clamping technology, and in particular to a ring workpiece clamping device. Background Technology

[0002] In the field of precision machining, the application of annular flat products is becoming increasingly widespread. During the machining process, these products require stable clamping through an inner hole to ensure the grinding accuracy of critical parts such as the outer cylindrical surface and end face.

[0003] Existing clamping fixtures for the inner hole of ring-shaped products mainly include three-jaw internal chucks and ordinary internal expansion clamps. Among them, the three-jaw internal chuck has a large structure and the drive mechanism occupies a lot of space, making it unsuitable for the limited installation space of flat products; although ordinary internal expansion clamps achieve inner hole clamping through elastic expansion sleeves or multi-lobed expansion blocks, the expansion block drive components and upper and lower positioning structures often have high redundancy and are prone to protruding from the outer surface of the product.

[0004] For example, a patent application with publication number CN214321878U, published on October 1, 2021, discloses a gripping and detection device for annular workpieces. The device includes a base, a three-jaw cylinder mounted on the base, a chuck mounted on the three-jaw cylinder, and three jaws evenly arranged circumferentially on the chuck. The jaws reciprocate radially under the drive of the three-jaw cylinder. Sensors are mounted on the jaws. An adjusting component is mounted on the jaws, with several evenly spaced first teeth arranged radially along the chuck. A gripper for holding the workpiece is mounted on the adjusting component, with several second teeth on the gripper. The first and second teeth engage alternately. This gripping and detection device for annular workpieces can adapt to workpieces of different diameters. However, when the annular workpiece is in the grinding process, machining debris may enter the fixture, affecting gripping stability and product surface quality. Summary of the Invention

[0005] In view of this, the purpose of this utility model is to propose a ring-shaped workpiece clamping device to solve the problem affecting clamping stability.

[0006] To achieve the above objectives, this utility model provides a ring-shaped workpiece clamping device, including a placement platform. The placement platform is provided with an annular placement groove for placing a ring-shaped workpiece. The placement platform is provided with a receiving cavity located within the placement groove. An extension hole communicating with the receiving cavity is opened on the side wall of the placement groove. A push rod is provided in the extension hole. A driving member connected to the push rod is provided in the placement platform. The driving member is used to control the push rod to retract or extend from the extension hole, so as to loosen or clamp the ring-shaped workpiece placed on the placement groove.

[0007] Optionally, the end of the push rod away from the drive member is provided with a push head.

[0008] Optionally, the top head is an elastomer.

[0009] Optionally, the driving component includes a lifting component disposed on the placement platform. The lifting component is located below the receiving cavity. The lifting end of the lifting component is connected to a connector that extends through into the receiving cavity. The lifting component is used to control the lifting and lowering of the connector. The connector is provided with an elongated oval groove. The length axis of the elongated oval groove is parallel to the horizontal line. A first connecting rod and a second connecting rod are respectively provided on both sides of the connector. The first connecting rod and the second connecting rod are rotatably connected by a sliding pin. The sliding pin is disposed through the elongated oval groove. The end of the second connecting rod away from the sliding pin is rotatably connected to the top rod. The end of the first connecting rod away from the sliding pin is rotatably connected to the side wall of the receiving cavity. The side wall of the receiving cavity facing the protrusion hole abuts against the end of the first connecting rod away from the sliding pin. The end of the first connecting rod away from the sliding pin has an arc-shaped guide surface.

[0010] Optionally, the lifting component is a drive cylinder.

[0011] Optionally, the drive cylinder is a pneumatic cylinder.

[0012] Optionally, the end of the first connecting rod away from the sliding pin is rotatably connected to the inner sidewall of the receiving cavity via a first connecting pin, and the second connecting rod is rotatably connected to the top rod via a second connecting pin.

[0013] Optionally, the second connecting rod has a receiving groove on the side facing the top rod, and the end of the top rod facing the second connecting rod extends into the receiving groove.

[0014] The beneficial effects of this utility model are as follows: The annular workpiece clamping device provided by this utility model can clamp annular workpieces. The placement groove is annular in structure and precisely matches the shape of the annular workpiece. The annular workpiece is placed in the placement groove on the placement table. Then, the driving component controls the push rod to extend out of the extension hole to clamp the annular workpiece placed on the placement groove. When the push rod extends out of the extension hole to clamp the annular workpiece, the gap between the extension hole and the side wall of the push rod is extremely small, forming a semi-closed protective structure. The debris generated from the subsequent grinding of the outer wall of the annular workpiece is difficult to enter the receiving cavity through the gap, avoiding the problem of debris jamming the push rod. Even after long-term use, the push rod can still maintain smooth extension and retraction, significantly improving clamping stability and the service life of the device. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 3 for Figure 2 Schematic diagram of section AA;

[0019] Figure 4 This is a schematic diagram of the clamping device of this utility model without the product body placed on it.

[0020] Figure 5 This is a schematic diagram of the cross-sectional structure of the present invention;

[0021] Figure 6 This is a partial structural schematic diagram of the present invention.

[0022] In the diagram: 1. Placement platform; 2. Placement groove; 3. Annular workpiece; 4. Receiving cavity; 5. Protruding hole; 6. Cylinder; 7. Connector; 8. Elongated groove; 9. Sliding pin; 10. First connecting rod; 11. Second connecting rod; 12. Push rod; 13. Push head; 14. First connecting pin; 15. Second connecting pin. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0024] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] like Figures 1 to 6 As shown, a ring-shaped workpiece clamping device includes a placement platform 1, on which an annular placement groove 2 for placing a ring-shaped workpiece 3 is provided. A receiving cavity 4 located within the placement groove 2 is provided in the placement platform 1. An extension hole 5 communicating with the receiving cavity 4 is provided on the side wall of the placement groove 2. A push rod 12 is provided in the extension hole 5. A driving member connected to the push rod 12 is provided in the placement platform 1. The driving member is used to control the push rod 12 to retract or extend from the extension hole 5, so as to release or clamp the ring-shaped workpiece 3 placed on the placement groove 2.

[0026] When the annular workpiece 3 needs to be clamped, the placement groove 2 is annular in structure and precisely matches the shape of the annular workpiece 3. The annular workpiece 3 is placed in the placement groove 2 on the placement table 1, and then the drive unit controls the push rod 12 to extend out of the extension hole 5 to clamp the annular workpiece 3 placed in the placement groove 2. When the push rod 12 extends out through the extension hole 5 to clamp the annular workpiece 3, the gap between the extension hole 5 and the side wall of the push rod 12 is extremely small, forming a semi-closed protective structure. The debris generated by grinding the outer side wall of the annular workpiece 3 is difficult to enter the receiving cavity 4 through the gap, avoiding the problem of debris jamming the push rod 12. Even after long-term use, the push rod 12 can still maintain smooth extension and retraction, significantly improving the clamping stability and service life of the device.

[0027] The clamping and unclamping process of this device can be completed simply by the extension and retraction of the drive component, making it convenient and fast to operate, effectively shortening auxiliary processing time and improving batch production efficiency.

[0028] The top rod 12 is provided with a top head 13 at the end away from the driving component. The top head 13 can be an elastic body, such as elastic rubber or polyurethane. The elastic body facilitates the elastic clamping of the annular workpiece 3, protects the inner surface of the annular workpiece 3, and fits the inner hole wall of the annular workpiece 3 through elastic deformation when clamped. This increases the contact area and improves the clamping friction, while also buffering the impact of the clamping force on the annular workpiece 3. This avoids scratches and indentations on the inner hole wall of the annular workpiece 3 caused by rigid clamping, and ensures the surface quality of the product.

[0029] The driving component includes a lifting component disposed on the placement platform 1. The lifting component is located below the receiving cavity 4. The lifting end of the lifting component is connected to a connector 7 that extends through into the receiving cavity 4. The lifting component is used to control the lifting and lowering of the connector 7. The connector 7 is provided with an elongated groove 8, the long axis of which is horizontal. A first connecting rod 10 and a second connecting rod 11 are respectively provided on both sides of the connector 7. The first connecting rod 10 and the second connecting rod 11 are rotatably connected by a sliding pin 9, which extends through the elongated groove 8. The end of the second connecting rod 11 away from the sliding pin 9 is rotatably connected to the top rod 12. The end of the first connecting rod 10 away from the sliding pin 9 is rotatably connected to the side wall of the receiving cavity 4. The side wall of the receiving cavity 4 facing the protrusion hole 5 abuts against the end of the first connecting rod 10 away from the sliding pin 9. The end of the first connecting rod 10 away from the sliding pin 9 has an arc-shaped guide surface.

[0030] As the lifting component rises, the sliding pin 9 moves upward due to the restriction of the elongated groove 8. Subsequently, the right end of the first connecting rod 10 swings upward, causing the sliding pin 9 to move towards the extension hole 5. This, in turn, pushes the top rod 12 out of the extension hole 5 through the second connecting rod 11. By adopting the linkage structure of the first connecting rod 10, the second connecting rod 11, the sliding pin 9, and the elongated groove 8, the axial lifting motion of the driving component is converted into the radial linear motion of the top rod 12. The transmission path is clear and the force transmission loss is small. In addition, when the first connecting rod 10, the second connecting rod 11, and the top rod 12 are pushed into a straight line, the output force is the maximum and is the internal force of the product, which will not be transmitted to the cylinder 6. Even if the cylinder 6 is cut off from air, the clamping force will not be lost, thus improving the service life of the cylinder 6 and ensuring stable clamping force.

[0031] The core components, such as the first connecting rod 10 and the second connecting rod 11, are all built into the receiving cavity 4 of the placement stage 1. The overall structure does not exceed the outer contour of the placement stage 1 and the annular workpiece 3, and does not protrude from the outer surface of the annular workpiece 3. This effectively avoids interference between the grinding head and the fixture components, preventing the fixture from being damaged by grinding and ensuring that the outer side wall of the annular workpiece 3 is ground without obstruction. This solves the core pain points of limited fixture space and interference prevention for annular flat products.

[0032] The lifting component can be a drive cylinder, and the driving method of the drive cylinder is not limited to hydraulic, electric or pneumatic. The drive cylinder can be a pneumatic cylinder 6, and the pneumatic cylinder 6 controls the lifting of the telescopic joint 7.

[0033] The end of the first connecting rod 10 away from the sliding pin 9 is rotatably connected to the inner wall of the receiving cavity 4 through the first connecting pin 14, and the second connecting rod 11 is rotatably connected to the top rod 12 through the second connecting pin 15.

[0034] The height of the first connecting pin 14 is the same as the height of the second connecting pin 15. The first connecting pin 14 and the second connecting pin 15 are at the same height. When the first connecting rod 10, the second connecting rod 11 and the push rod 12 are pushed into a straight line, the output force is at its maximum and is the internal force of the product. It will not be transmitted to the cylinder 6. Even if the cylinder 6 is cut off from air, it will not lose the clamping force, thus improving the service life of the cylinder 6 and stabilizing the clamping force.

[0035] The second connecting rod 11 has a receiving groove on the side facing the top rod 12, and the end of the top rod 12 facing the second connecting rod 11 extends into the receiving groove.

[0036] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0037] The embodiments of this utility model are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A ring-shaped workpiece clamping device, comprising a placement platform, characterized in that, The placement platform is provided with an annular placement groove for placing an annular workpiece. The placement platform is provided with a receiving cavity located in the placement groove. An extension hole communicating with the receiving cavity is opened on the side wall of the placement groove. A push rod is provided in the extension hole. A driving component connected to the push rod is provided in the placement platform. The driving component is used to control the push rod to retract or extend from the extension hole, so as to loosen or clamp the annular workpiece placed on the placement groove.

2. The ring-shaped workpiece clamping device according to claim 1, characterized in that, The end of the push rod away from the driving member is provided with a push head.

3. The annular workpiece clamping device according to claim 2, characterized in that, The top is an elastic body.

4. The ring-shaped workpiece clamping device according to claim 1, characterized in that, The driving component includes a lifting component mounted on the placement platform. The lifting component is located below the receiving cavity. The lifting end of the lifting component is connected to a connector that extends through the receiving cavity. The lifting component is used to control the lifting and lowering of the connector. The connector is provided with an elongated oval groove, the long axis of which is horizontal. A first connecting rod and a second connecting rod are respectively provided on both sides of the connector. The first connecting rod and the second connecting rod are rotatably connected by a sliding pin. The sliding pin extends through the elongated oval groove. The end of the second connecting rod away from the sliding pin is rotatably connected to the top rod. The end of the first connecting rod away from the sliding pin is rotatably connected to the side wall of the receiving cavity. The side wall of the receiving cavity facing the protrusion hole abuts against the end of the first connecting rod away from the sliding pin. The end of the first connecting rod away from the sliding pin has an arc-shaped guide surface.

5. A ring-shaped workpiece clamping device according to claim 4, characterized in that, The lifting component is a drive cylinder.

6. The annular workpiece clamping device according to claim 5, characterized in that, The drive cylinder is a pneumatic cylinder.

7. The annular workpiece clamping device according to claim 4, characterized in that, The end of the first connecting rod away from the sliding pin is rotatably connected to the inner sidewall of the receiving cavity via a first connecting pin, and the second connecting rod is rotatably connected to the top rod via a second connecting pin.

8. A ring-shaped workpiece clamping device according to claim 4, characterized in that, The second connecting rod has a receiving groove on the side facing the top rod, and the end of the top rod facing the second connecting rod extends into the receiving groove.

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