Dimension self-adaptive chuck clamping device

Abstract

The invention discloses a size self-adaptive chuck clamping device, belongs to the technical field of free-form surface measurement, and is designed for solving the problem of clamping circular free-form surfaces with different sizes. The chuck comprises a chuck base, a chuck rotating disc and a size adjusting and fixing accessory. The chuck base can be used for fixing the whole chuck, and corresponding hole grooves are designed to install size adjusting fixing accessories. The chuck rotating disc is supported by the chuck base and associated with the size adjusting accessory, the clamping range is expanded through relative rotation of the chuck rotating disc and the chuck base, and after a free-form surface to be clamped is placed in, the system achieves automatic clamping according to the size of a workpiece. The chuck designed by the invention can adaptively clamp a circular free-form surface of which the size changes within a certain range, and additional accessories and operation steps are not needed.

Description

Technical Field

[0001] The invention relates to the technical field of free-form surface measurement, in particular to a size-adaptive chuck clamping device. Background Art

[0002] With the continuous development of free-form surface technology, the corresponding measurement methods are also constantly enriched. Scanning measurement has become a widely concerned measurement method that can measure complex free-form surfaces. In order to avoid the change of the coordinate reference between the surface to be measured and the measurement system due to factors such as vibration during the scanning measurement process, the surface to be measured needs to be clamped and fixed to ensure that the motion control system can maintain a fixed relative position when carrying the free-form surface to be measured.

[0003] Currently, the commonly used fixing methods include gluing, screw fixing and chuck fixing. Among them, the gluing method has a lower cost, but it will form residual contamination on the edge of the test piece and the surface of the workpiece table, which limits its use in the precision measurement process. The screw fixing method will not cause residual contamination, but on the one hand, the screw fixing is not easy to center the test surface, and on the other hand, the screw may cause scratches on the edge of the test surface. The use of a chuck to fix the free-form surface has a stable structure and can be used multiple times without causing pollution. However, the current chuck device has a relatively fixed size on the one hand. When the size of the free-form surface changes, the chuck needs to be replaced for clamping. On the other hand, the chuck provides clamping force through mechanical structures such as screws, which is difficult to control and easily causes damage to the free-form surface. It is not applicable under many conditions. Therefore, it is urgent to design a clamping device that can clamp free-form surfaces of different sizes, which is easy to use, accurately positioned and wear-free. Summary of the invention

[0004] In order to solve the deficiencies of the existing technical conditions, the present invention designs a size-adaptive chuck clamping device, which can clamp free-form surfaces of different sizes without the need for additional structural adjustments, and the clamping force is provided by spring tension, which will not cause damage to the free-form surface.

[0005] The specific scheme of the present invention is as follows:

[0006] A size-adaptive chuck clamping device, the chuck clamping device comprising: a chuck base, a chuck turntable, a chuck slider, a chuck lever, a spring support, and a tension spring;

[0007] The chuck turntable and the chuck base are matched in size, the chuck turntable is placed on the chuck base and rotates, the rotation between the chuck base and the chuck turntable is completed by the chuck lever, the chuck slider performs telescopic movement along the radial direction of the chuck, one end of the chuck slider slides along the turntable chuck slider sliding groove opened on the chuck turntable, and the other end of the chuck slider slides along the base chuck slider sliding groove opened on the chuck base, and the telescopic movement of the chuck slider is achieved by the relative rotation of the chuck turntable and the chuck base; the resetting of the chuck turntable is completed by the tension spring, and the two ends of the tension spring are respectively connected to the chuck base and the chuck turntable through spring struts;

[0008] In the natural state, the tension spring returns to its original state, and the chuck slider is in the longest extended state; when the workpiece needs to be clamped, the chuck lever connected to the chuck base and the chuck turntable respectively is moved to drive the chuck base and the chuck turntable to rotate relative to each other, at which time the chuck slider begins to contract, the tension spring is in a stretched state, the chuck slider contracts, the chuck lever is released, the chuck turntable is reset under the elastic force of the tension spring, and the chuck slider is extended to adaptively clamp the workpiece.

[0009] The present invention has the following beneficial effects:

[0010] 1. The present invention realizes automatic clamping of free-form surfaces of different sizes through the chuck structure design, and adaptively controls the size through spring elastic force without the need for additional adjustment steps.

[0011] 2. The slider used in the present invention is made of polytetrafluoroethylene material, which provides clamping force for the free-form surface and does not cause damage to the surface to be clamped.

[0012] 3. The chuck of the present invention has a simple structure and is easy to operate. When in use, it is only necessary to move the lever once and put it into the surface to be clamped. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the appearance structure diagram of the chuck system in the present invention.

[0014] Figure 2 It is a structural diagram of the appearance of the chuck base of the chuck system component in the present invention.

[0015] Figure 3 It is a side view of the appearance structure of the chuck base of the chuck system component in the present invention.

[0016] Figure 4 It is a structural diagram of the appearance of the chuck turntable of the chuck system component in the present invention.

[0017] Figure 5 It is a structural diagram of the appearance of the chuck slider of the chuck system component in the present invention.

[0018] Figure 6It is a cross-sectional view of the chuck system of the present invention.

[0019] Reference numerals

[0020] 11. Chuck base; 11a. Tension spring fixing groove; 11b. Tension spring support fixing threaded hole of base; 11c. Chuck slider sliding groove of base; 11d. Grease filling hole; 11e. Base lever fixing threaded hole; 11f. Chuck base fixing hole; 11g. Chuck base top screw matching inclined surface;

[0021] 12. Chuck turntable; 12a. Turntable chuck slider sliding groove; 12b. Turntable tension spring support fixing threaded hole; 12c. Top screw fixing hole; 12d. Turntable lever fixing threaded hole;

[0022] 13. Chuck slider; 13a. Cylinder; 13b. Cuboid;

[0023] 14. Chuck lever;

[0024] 15. Spring support;

[0025] 16. Gasket;

[0026] 17. Tension spring;

[0027] 18. Top thread. DETAILED DESCRIPTION

[0028] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with ordinary skills in the field to which the present invention belongs. "Including" and similar words used herein mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0031] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0032] like Figure 1 As shown, the first embodiment provided by the present invention is a size-adaptive chuck clamping device, which can adapt to the clamping of circular free-form surfaces of different sizes. The chuck is composed of a chuck base 11, a chuck turntable 12, a chuck slider 13, a chuck lever 14, a spring support 15, a gasket 16, a tension spring 17, and a top screw 18. In the natural state, the tension spring 17 is restored, and the chuck slider 13 is in the longest extended state. When it is necessary to clamp the workpiece, the chuck lever 14 is moved, and the chuck lever 14 is respectively connected to the chuck base 11 and the chuck turntable 12, driving the two to rotate relative to each other. At this time, the chuck slider 13 begins to shrink, and the tension spring 17 is in a stretched state. After the chuck slider 13 shrinks, the free-form surface is placed on the gasket 16, and the gasket 16 is connected to the chuck base 11 to support the surface to be clamped. Finally, the chuck lever 14 is released, the chuck turntable 12 is reset under the elastic force of the tension spring 17, and the chuck slider 13 is extended to adaptively clamp the workpiece.

[0033] by Figure 1 The basics of the chuck system operation method are as follows: rotate the chuck lever 14, which is respectively installed on the chuck base 11 and the chuck turntable 12. At this time, the chuck lever 14 drives the chuck turntable 12 and the chuck base 11 to rotate relative to each other. Due to the motion constraint, the chuck slider 13 will change from an extended state to a retracted state. At this time, place the free curved surface to be clamped on the gasket 16, release the chuck lever 14, the chuck turntable 12 will automatically reset, and the chuck slider 13 will extend to the clamping surface. At this time, the chuck completes clamping.

[0034] The chuck turntable 12 and the chuck base 11 rotate relative to each other, so the processing roughness of the contact surface between the two should be ensured to be at the micron level, and the two should be made of metal materials with certain strength and self-lubricating properties, and the material in this example is copper.

[0035] The chuck slider 13 slides relatively between the chuck turntable 12 and the chuck base 11 and needs to be in direct contact with the surface to be measured to provide clamping force. Therefore, polytetrafluoroethylene material with self-lubricating properties is selected as the processing material of the chuck slider in this example.

[0036] The gasket 16 provides support for the surface to be measured, and the surface to be measured slides on the gasket 16 to move to the center for clamping, so there are certain requirements for the material of the gasket 16. In this example, polytetrafluoroethylene material with self-lubricating properties is selected as the gasket processing material.

[0037] The chuck base 11 designed in this example is as follows Figure 2 As shown, the chuck base 11 is provided with a tension spring fixing groove 11a for accommodating the tension spring 17 and providing rotational reset force. One end of the tension spring 17 is fixed by a spring support 15, and the spring support 15 is fixed to the tension spring support fixing threaded hole 11b of the base. This structure is used to connect the tension spring 17 to the chuck base 11 through the spring support 15. The chuck slider 13 slides in the base chuck slider sliding groove 11c and cooperates with the chuck turntable 12 to achieve telescopic movement. In order to ensure that there is sufficient lubricity between the chuck turntable 12 and the chuck base 11, the chuck base 11 is designed with a grease filling hole 11d. Grease is appropriately added to the grease filling hole 11d to ensure smooth rotation. The chuck lever 14 is fixed to the base lever fixing threaded hole 11e of the chuck base 11, and cooperates with the chuck lever 14 to achieve relative rotation. The entire chuck is fixed to the workpiece table through a chuck base fixing hole 11f extending from the chuck base 11, and the position of the chuck base fixing hole 11f can be adjusted according to the actual installation structure.

[0038] Among them, the direction of the base chuck slider sliding groove 11c does not point to the center of the circle. This direction is determined by the size of the chuck slider 13 and the rotation angle of the chuck turntable 12. It needs to be designed in combination with actual conditions and can be determined by the two extreme positions of the chuck slider 13.

[0039] The position of the base lever fixing threaded hole 11e is as follows: Figure 3 As shown, the chuck base 11 is supplemented with a chuck base top screw matching inclined surface 11g for matching with the chuck turntable 12 through the top screw 18 to achieve positioning of the chuck turntable 12.

[0040] The chuck turntable 12 designed in this example is as follows Figure 4As shown, the chuck turntable 12 itself matches the size of the chuck base 11, and can be placed on the chuck base 11 and rotated. As mentioned above, the rotation between the chuck base 11 and the chuck turntable 12 is completed by the chuck lever 14, and the chuck turntable 12 is designed with a turntable lever fixing threaded hole 12d for installing the chuck lever 14. In order to constrain the chuck slider 13 to perform telescopic movement, the chuck turntable 12 is provided with a turntable chuck slider sliding groove 12a. When the chuck turntable 12 rotates relative to the chuck base 11, the chuck slider 13 will move relatively along the turntable chuck slider sliding groove 12a. The reset of the chuck turntable 12 is completed by the tension spring 17, so it is necessary to design the connection method between the tension spring 17 and the chuck turntable 12. In this example, one end of the tension spring 17 is installed on the chuck turntable 12 through the spring support 15, and the spring support 15 is installed in the turntable tension spring support fixing threaded hole 12b opened in the chuck turntable 12. At this time, the chuck turntable 12 is connected to the chuck base 11 through the chuck slider 13, the tension spring 17 and the smooth contact surface. To ensure the stability of the connection, a top screw fixing hole 12c is opened at the chuck turntable 12 for installing a top screw 18 to ensure the stability of the connection between the chuck turntable 12 and the chuck base 11. The chuck turntable 12 and the chuck base 11 are embedded and fixed through the tension spring 17 and the chuck slider 13. To ensure relative stability, the top screw 18 installed on the chuck turntable 12 cooperates with the chuck base top screw matching inclined surface 11g designed on the chuck base 11 to further improve the stability of the system.

[0041] Among them, due to the uncertainty of the size of the tension spring 17, threaded holes are opened at multiple positions during design to adapt to the installation of tension springs 17 with different tensions and different sizes, thereby avoiding structural modifications during the actual installation process.

[0042] The chuck slider 13 designed in this example is as follows Figure 5 As shown, the position where the chuck slider 13 cooperates with the chuck base 11 is a cylinder 13a, which cooperates with the base chuck slider sliding groove 11c of the chuck base 11, and the position where the chuck slider 13 cooperates with the chuck turntable 12 is a rectangular block 13b. This structure can slide in the turntable chuck slider sliding groove 12a of the chuck turntable 12 to achieve telescopic clamping.

[0043] Among them, through this structural design, the telescopic state of the chuck slider 13 is completely determined by the relative rotation position of the chuck base 11 and the chuck turntable 12.

[0044] The internal structure of the chuck designed in this example is as follows Figure 6As shown, this figure is a cross-sectional view of the designed example. This figure shows the connection method and connection position between each component. The two ends of the tension spring 17 are respectively connected to the chuck base 11 and the chuck turntable 12 through the spring support 15. When the chuck lever 14 is turned to make the chuck turntable 12 and the chuck base 11 rotate relative to each other, the tension spring 17 is extended. When it is placed on the surface to be clamped, the chuck lever 14 is released, and the chuck turntable 12 is reset by the spring tension, driving the chuck slider 13 to extend to the clamping surface. In order to ensure the stability of the chuck turntable 12 during rotation, a top screw 18 is installed in the design structure, and the top screw fixing hole 12c designed through the chuck turntable 12 cooperates with the chuck base 11 to provide support and fixing force for the chuck turntable 12.

[0045] in, Figure 6 The cross section of the chuck slider 13 is the cross section where the chuck slider 13 matches the chuck base 11 .

[0046] Among them, the various structures in the chuck are distributed in a circular array to ensure structural symmetry and movement stability.

[0047] In order to ensure that the top screw 18 does not damage the surface of the chuck base 11 during the rotation of the chuck turntable 12 , the top end material of the top screw 18 is polytetrafluoroethylene.

[0048] Although the embodiments of the present invention are described in detail above, it is obvious to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations are within the scope and spirit of the present invention as described in the claims. Moreover, the present invention described herein may have other embodiments and may be implemented or realized in a variety of ways.

Claims

1. A size-adaptive chuck clamping device, characterized in that: The chuck clamping device comprises: a chuck base, a chuck turntable, a chuck slider, a chuck lever, a spring support, and a tension spring; The chuck turntable and the chuck base are matched in size, the chuck turntable is placed on the chuck base and rotates, the rotation between the chuck base and the chuck turntable is completed by the chuck lever, the chuck slider performs telescopic movement along the radial direction of the chuck, one end of the chuck slider slides along the turntable chuck slider sliding groove opened on the chuck turntable, and the other end of the chuck slider slides along the base chuck slider sliding groove opened on the chuck base, and the telescopic movement of the chuck slider is achieved by the relative rotation of the chuck turntable and the chuck base; the resetting of the chuck turntable is completed by the tension spring, and the two ends of the tension spring are respectively connected to the chuck base and the chuck turntable through spring struts; In the natural state, the tension spring returns to its original state, and the chuck slider is in the longest extended state; when the workpiece needs to be clamped, the chuck lever connected to the chuck base and the chuck turntable respectively is moved to drive the chuck base and the chuck turntable to rotate relative to each other, at which time the chuck slider begins to contract, the tension spring is in a stretched state, the chuck slider contracts, the workpiece to be measured is placed, the chuck lever is released, the chuck turntable is reset under the elastic force of the tension spring, and the chuck slider is extended to adaptively clamp the workpiece.

2. A size-adaptive chuck clamping device according to claim 1, characterized in that: The chuck turntable and the chuck base are made of copper material, and the chuck base is provided with a hole for filling with grease.

3. The size-adaptive chuck clamping device according to claim 1, characterized in that: It also includes a gasket, which is connected to the chuck base. The gasket provides support for the surface of the workpiece to be measured. At the same time, the surface of the workpiece to be measured slides on the gasket under force and moves to the center for clamping. The gasket is made of polytetrafluoroethylene.

4. The size-adaptive chuck clamping device according to claim 1, characterized in that: The chuck slider is made of polytetrafluoroethylene material.

5. The size-adaptive chuck clamping device according to claim 1, characterized in that: The chuck turntable and the chuck base are embedded and fixed through the tension spring and the chuck slider, the chuck turntable installation top screw is matched with the chuck base top screw matching inclined surface designed for the chuck base, and the front end of the top screw is made of polytetrafluoroethylene material.

6. A size-adaptive chuck clamping device according to claim 5, characterized in that: The chuck turntable is designed with threaded holes at different positions, and the spring pillars are installed in the threaded holes. The tension of the tension spring is adjusted by changing the position of the spring pillars.

7. The size-adaptive chuck clamping device according to claim 1, characterized in that: The chuck base is provided with a tension spring fixing groove for accommodating the tension spring and providing rotational reset force. One end of the tension spring is installed on the chuck base through a spring support, and the spring support is fixed to the tension spring support fixing threaded hole of the base. The other end of the tension spring is installed on the chuck turntable through a spring support, and the spring support is installed in the turntable tension spring support fixing threaded hole opened on the chuck turntable.

8. The size-adaptive chuck clamping device according to claim 1, characterized in that: The entire chuck is fixed on the workpiece table through a chuck base fixing hole extending from the chuck base, and the position of the chuck base fixing hole is adjusted according to the actual installation structure.

9. The size-adaptive chuck clamping device according to claim 1, characterized in that: The direction of the sliding groove of the base chuck slider is not pointing to the center of the circle. The direction is determined by the size of the chuck slider and the rotation angle of the chuck turntable, and is determined by the two extreme positions of the chuck slider.

10. The size-adaptive chuck clamping device according to claim 1, characterized in that: The part where the chuck slider matches with the chuck base is a cylinder, and the part where the chuck slider matches with the chuck turntable is a cuboid.

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