Bidirectional locking adjustable clamping device for nanoindentation sample polishing process

Abstract

The invention relates to the field of nanoindentation experiments, and discloses a two-way locking adjustable clamping device for a nanoindentation sample polishing procedure, the two-way locking adjustable clamping device comprises a bottom plate, an angle adjusting assembly is arranged on the upper surface of the bottom plate, a stand column is arranged on the surface of the angle adjusting assembly, and a sliding plate penetrates through the surface of the stand column and is slidably connected with the surface of the stand column; and the side wall of the rear end of the sliding plate penetrates through and is in threaded connection with a positioning screw rod, and a clamping assembly is arranged on the inner wall of the bottom end of the sliding plate. Through a double-locking structure of horizontal lateral clamping and vertical downward pressing, a lateral clamping block is precisely attached to the side wall of a sample, an upper pressing plate always presses the upper surface of the sample under the action of a reset spring, and all-directional fixing is formed; and in cooperation with the thread self-locking performance of the positioning screw and the locking screw, even if facing high-speed polishing friction force, no displacement and no flying of the sample can be ensured, the damage rate of the sample is greatly reduced, and the experiment efficiency is remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nanoindentation experiment, in particular to a two-way locking adjustable clamping device for nanoindentation sample polishing process. BACKGROUND

[0002] In the nanoindentation experiment, the pretreatment polishing process of the nanoindentation sample such as bone sample is crucial. The sample embedded in resin needs to be polished to a thickness of 0.1-0.5mm and a surface roughness Ra≤0.2μm, so as to meet the accuracy requirements of subsequent indentation test. At present, the sample fixing methods for this process in the industry mainly include two types: one is that the operator manually clamps the sample directly, and polishes the surface to be polished close to the high-speed rotating polishing wheel; the other is to use ordinary bench vise, rubber band binding or magnetic simple clamp to clamp the sample from the side and fix it on the polishing machine workbench. Both types are designed to meet the basic polishing requirements.

[0003] However, the existing fixing methods have many defects that cannot be ignored: first, the clamping stability is poor. The surface of the sample embedded in resin is smooth, and the lateral clamping force of the simple clamp is easily broken by the high-speed friction force of the polishing wheel, resulting in a high sample flying rate and a high sample damage rate; second, the operation safety is low. When manually clamping, the fingers need to be close to the high-speed rotating polishing wheel, with a minimum distance of less than 2cm, which is easy to cause scratching, water mist wrapping sand particles and scratching; the simple clamp lacks reliable self-locking anti-loose structure, and may fall off during high-speed operation to cause secondary hidden troubles. Third, the adaptability and sample protection are insufficient. The existing clamp has a narrow adjustment range of clamping size and thickness, and cannot adapt to small samples of 1cm×1cm or ultra-thin samples of ≤0.3mm. Moreover, it is in hard contact, which easily causes the resin embedding layer to crack, and even damages the internal microstructure of the sample, affecting the accuracy of subsequent test data. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a two-way locking adjustable clamping device for nanoindentation sample polishing process, which solves the problems of poor clamping stability, smooth surface of the sample embedded in resin, and high sample flying rate caused by the lateral clamping force of the simple clamp being easily broken by the high-speed friction force of the polishing wheel.

[0005] To achieve the above purpose, the present application realizes the technical scheme as follows: a two-way locking adjustable clamping device for nanoindentation sample polishing process, comprising a bottom plate, an angle adjusting assembly is arranged on the upper surface of the bottom plate, a stand is arranged on the surface of the angle adjusting assembly, a sliding plate is penetratingly and slidably connected to the surface of the stand, a positioning screw is penetratingly and threadedly connected to the side wall of the rear end of the sliding plate, and a clamping assembly is arranged on the inner wall of the bottom end of the sliding plate. The angle adjusting assembly is used for fine adjustment of the angle of the stand to realize clamping and fixing of the inclination angle. Clamping components are used to clamp and fix nano-indentation samples from multiple angles.

[0006] Preferably, the clamping assembly includes a rotating block, which is rotatably connected to the end of the sliding plate away from the column. The rotating block has a fixedly connected bidirectional threaded rod on its rotation center axis. Two sets of trapezoidal blocks are threadedly connected to the surface of the bidirectional threaded rod. A connecting plate is fixedly connected to the lower surface of each set of trapezoidal blocks. A precision screw is threadedly connected to the rear end of the connecting plate. A lateral clamping block is fixedly connected to the front end of the precision screw.

[0007] Preferably, the angle adjustment component includes a fixing block, the inner sidewall of which is rotatably connected to a rotating shaft, the fixing block is fixedly connected to the upper surface of the base plate, a guide ring is fixedly connected to the upper surface of the base plate, and a locking screw is threadedly connected to the rear end of the column.

[0008] Preferably, the outer sidewall of the connecting plate has an inclined groove, the outer sidewall of the lateral clamping block has a vertical groove, the inner sidewalls of the inclined groove and the vertical groove are slidably connected with a protruding rod, the rear end of the protruding rod is fixedly connected to an L rod, the top surface of the L rod is elastically connected to a guide rod through a return spring, and the lower surface of the guide rod is fixedly connected to an upper pressure plate.

[0009] Preferably, one end of the positioning screw that passes through the sliding plate contacts the outer sidewall of the column.

[0010] Preferably, the bidirectional threaded rod is rotatably connected to the inner wall of the bottom end of the sliding plate, the trapezoidal block is slidably connected to the inner wall of the bottom end of the sliding plate, the inner side of the connecting plate has a cavity, and the lateral clamping block is slidably connected to the inner wall of the cavity of the connecting plate.

[0011] Preferably, the rotating shaft is fixedly connected to the outer wall at the bottom of the column.

[0012] Preferably, the surface of the guide ring is provided with a through guide groove, the outer wall of the locking screw is in contact with the inner side wall of the guide ring guide groove, and the guide ring guide groove is opened at the rotation center point of the shaft.

[0013] Preferably, the inner sidewall of the L-bar is in contact with the surface of the front end of the lateral clamping block.

[0014] Preferably, one end of the return spring is fixedly connected to the inner side wall of the guide rod, and the other end of the return spring is fixedly connected to the upper surface of the L rod, with the guide rod passing through and slidably connected to the inner wall of the L rod.

[0015] Working Principle: First, the device is fixedly installed. Four sets of internal threaded grooves on the base plate surface allow for bolt fixing or suction cup installation, enabling various adaptation methods to different polishing machine worktables. Next, angle adjustment is performed. Rotating the locking screw in the angle adjustment assembly moves it outwards and disengages it from the guide ring, releasing the column's fixation. Using the pivot on the inner side of the fixing block as the center, rotate the column to the appropriate tilt angle. Reverse rotation of the locking screw ensures tight contact with the inner wall of the guide ring groove, using the threaded self-locking property to fix the column's position. Then, the height is adjusted by loosening the positioning screw at the rear end of the sliding plate. Pushing the sliding plate up and down along the column surface to the target height, the positioning screw is then rotated to pass through the sliding plate and press against the outer side wall of the column, fixing the sliding plate through the threaded self-locking property. This adapts to the clamping requirements of nano-indentation samples of different heights.

[0016] The nano-indentation sample is placed in the preset clamping position. The rotating block in the clamping assembly is rotated, causing the bidirectional threaded rod, whose central axis is fixed, to rotate. Because the bidirectional threaded rod has two sets of threads with opposite directions and is threadedly connected to two sets of trapezoidal blocks, the two sets of trapezoidal blocks move closer together along the inner wall of the bottom of the sliding plate during rotation. The connecting plate, fixed to the lower surface of the trapezoidal blocks, moves synchronously, causing the inner lateral clamping blocks to move towards the sample until they are close to the sample surface. This completes the coarse horizontal adjustment and clamping of the sample, laying the foundation for subsequent fine fixation.

[0017] A precision screw at the rear end of the rotating connecting plate pushes the lateral clamping block forward along the inner wall of the connecting plate cavity until the silicone pad on the surface of the lateral clamping block is tightly fitted against the side wall of the sample, achieving precise horizontal clamping. During this process, the vertical groove on the outer side of the lateral clamping block causes the protruding rod to slide within the inclined groove of the connecting plate. The protruding rod tilts and descends, simultaneously moving the L-shaped rod at the rear end downwards. The L-shaped rod, through a guide rod, moves the upper pressure plate closer to the upper surface of the sample. A return spring provides elastic support to the upper pressure plate, ensuring it remains in close contact with the upper surface of the sample, achieving vertical clamping and fixation. Simultaneously, the silicone pads at the front ends of the lateral clamping block and the L-shaped rod prevent scratching the sample, ultimately forming a bidirectional locking system that ensures the sample remains stable and does not shift during polishing.

[0018] This invention provides a bidirectional locking adjustable clamping device for polishing nano-indentation samples. It offers the following advantages: 1. This invention employs a dual locking structure of horizontal lateral clamping and vertical downward pressing. The lateral clamping block precisely fits the side wall of the sample, while the upper pressing plate, under the action of the return spring, always presses against the upper surface of the sample, forming an all-round fixation. Combined with the self-locking properties of the positioning screw and locking screw, even under high-speed polishing friction, it ensures that the sample does not shift or fly away, significantly reducing the sample breakage rate and greatly improving experimental efficiency.

[0019] 2. The angle adjustment component of this invention supports 0-15° tilt fine adjustment of the column, the sliding plate can flexibly adjust the height along the column, the bidirectional threaded rod realizes coarse adjustment of the clamping distance, and the precision screw completes fine calibration. It can adapt to various nano-indentation samples with sizes from 1cm×1cm to 5cm×3cm and thicknesses from 0.1-2cm. Whether it is a small sample, an ultra-thin sample, or a need for tilt angle polishing, it can be accurately adapted, breaking through the adaptation limitations of traditional clamps.

[0020] 3. The base plate of this invention adopts a dual fixing mode of bolts and suction cups, which is compatible with different types of polishing machine worktables; there is no need to manually approach the high-speed rotating polishing wheel throughout the process, completely avoiding safety hazards such as scratches and abrasions; the silicone pad at the front end of the side clamping block and L-rod, combined with the elastic support design of the pressure plate, avoids damage to the resin embedding layer and sample microstructure by hard contact, ensuring the accuracy of subsequent test data; all adjustment actions are completed manually without additional tools, and the operation process is simple and efficient. Attached Figure Description

[0021] Figure 1 This is an overall perspective view of the present invention; Figure 2 This is a schematic diagram of the structure of the column and angle adjustment component in the separated state of the present invention; Figure 3 This is a schematic diagram of the structure of the column and sliding plate in the separated state of the present invention; Figure 4 This is a partial cross-sectional view of the sliding plate structure of the present invention; Figure 5 This is a side view of the connecting plate structure of the present invention; Figure 6 This is a schematic diagram of the structure of the connecting plate and the lateral clamping block in the separated state according to the present invention; Figure 7 This is a partial cross-sectional view of the L-bar structure of the present invention.

[0022] The components include: 1. Base plate; 2. Angle adjustment assembly; 21. Guide ring; 22. Fixing block; 23. Rotating shaft; 24. Locking screw; 3. Column; 4. Sliding plate; 5. Clamping assembly; 51. Rotating block; 52. Bidirectional threaded rod; 53. Trapezoidal block; 54. Connecting plate; 55. Precision screw; 56. Lateral clamping block; 57. Inclined groove; 58. Vertical groove; 59. Protruding rod; 510. L-shaped rod; 511. Guide rod; 512. Upper pressure plate; 513. Return spring; 6. Positioning screw. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example: Please see the appendix Figure 1 -Appendix Figure 3 This invention provides a bidirectional locking adjustable clamping device for polishing nano-indentation samples, including a base plate 1. The surface of the base plate 1 has four sets of internal thread grooves, which can be fixed to the worktable with bolts. At the same time, suction cups can also be installed in the internal thread grooves, thereby realizing multiple installation and fixing methods. An angle adjustment component 2 is provided on the upper surface of the base plate 1. A column 3 is provided on the surface of the angle adjustment component 2. A sliding plate 4 is slidably connected through the surface of the column 3. A positioning screw 6 is threaded through the side wall of the rear end of the sliding plate 4. One end of the positioning screw 6 passes through the sliding plate 4 and contacts the outer side wall of the column 3. A cavity that fits the outer side of the column 3 is opened at the rear end of the sliding plate 4, and the positioning screw 6 passes through and abuts against the outer side of the column 3, thereby fixing the sliding plate 4 at multiple positions on the surface of the column 3, realizing the clamping of nano-indentation samples of different heights. At the same time, the threaded engagement between the positioning screw 6 and the sliding plate 4 has self-locking properties. A clamping component 5 is provided on the inner wall of the bottom end of the sliding plate 4. Angle adjustment component 2 is used to fine-tune the angle of column 3 to achieve clamping and fixing of the tilt angle; Clamping component 5 is used to clamp and fix the nano-indentation sample from multiple angles.

[0025] Reference Figures 4-6The clamping assembly 5 includes a rotating block 51, which is rotatably connected to the end of the sliding plate 4 away from the column 3. A bidirectional threaded rod 52 is fixedly connected to the rotation center axis of the rotating block 51. Two sets of threads with opposite directions are provided on the surface of the bidirectional threaded rod 52. Two sets of trapezoidal blocks 53 are threadedly connected to the surface of the bidirectional threaded rod 52. When the bidirectional threaded rod 52 rotates, the two sets of trapezoidal blocks 53 move closer together or further apart on the surface of the bidirectional threaded rod 52. The inner side of each trapezoidal block 53 has an internal thread groove that fits the bidirectional threaded rod 52. A connecting plate 54 is fixedly connected to the lower surface of each set of trapezoidal blocks 53. The rear end of the connecting plate 54 passes through and is threadedly connected to a precision... A precision screw 55 is fixedly connected to a lateral clamping block 56 at its front end. The precision screw 55 is threaded and passes through the inner side of the connecting plate 54, so that when the precision screw 55 rotates, it will push the lateral clamping block 56 to move synchronously, thereby achieving fine adjustment. A bidirectional threaded rod 52 is rotatably connected to the inner wall of the bottom end of the sliding plate 4. A trapezoidal block 53 is slidably connected to the inner wall of the bottom end of the sliding plate 4. A cavity is opened on the inner side of the connecting plate 54. The lateral clamping block 56 is slidably connected to the inner wall of the cavity of the connecting plate 54. When the connecting plate 54 moves with the trapezoidal block 53, it will drive the lateral clamping block 56 to move synchronously, thereby achieving coarse adjustment of the nano-indentation sample.

[0026] Reference Figure 1 and Figure 2 The angle adjustment assembly 2 includes a fixing block 22, with a rotating shaft 23 rotatably connected to the inner sidewall of the fixing block 22. The rotating shaft 23 is fixedly connected to the outer wall of the bottom end of the column 3. The fixing block 22 is fixedly connected to the upper surface of the base plate 1. A guide ring 21 is fixedly connected to the upper surface of the base plate 1. A locking screw 24 is threadedly connected to the rear end of the column 3. A through guide groove is formed on the surface of the guide ring 21. The outer wall of the locking screw 24 contacts the inner sidewall of the guide groove of the guide ring 21. The column 3 is opened at the rotation center point of the rotating shaft 23. By rotating the locking screw 24, the inner side of the bottom end of the column 3 moves outward, thereby releasing the contact with the guide ring 21. At this time, the column 3 can be rotated to drive the rotating shaft 23 to rotate around the fixed block 22, thereby adjusting the tilt angle of the column 3. The locking screw 24 is rotated in the opposite direction to contact the guide ring 21, thereby fixing the position of the column 3. The threaded engagement between the locking screw 24 and the column 3 has self-locking properties.

[0027] Reference Figures 5-7The outer sidewall of the connecting plate 54 has a slanted groove 57, and the outer sidewall of the lateral clamping block 56 has a vertical groove 58. A protruding rod 59 is slidably connected to the inner sidewall of the slanted groove 57 and the vertical groove 58. By providing the protruding rod 59 through the inner walls of the vertical groove 58 and the slanted groove 57, when the lateral clamping block 56 is pushed forward for fine-tuning, it will cause the protruding rod 59 to tilt and descend synchronously. An L-shaped rod 510 is fixedly connected to the rear end of the protruding rod 59. During the tilting and descending process, the protruding rod 59 will simultaneously cause the L-shaped rod 510 to descend, thereby pressing the nano-indentation sample downwards to prevent it from becoming too thin after polishing and breaking. The inner sidewall of the L-shaped rod 510 is in contact with the surface of the front end of the lateral clamping block 56. Both the front end of the L-bar 510 and the guide rod 511 are equipped with silicone pads to reduce scratches on the nano-indentation sample. The top surface of the L-bar 510 is elastically connected to the guide rod 511 via a return spring 513. One end of the return spring 513 is fixedly connected to the inner side wall of the guide rod 511, and the other end of the return spring 513 is fixedly connected to the upper surface of the L-bar 510. The guide rod 511 passes through and is slidably connected to the inner wall of the L-bar 510. The lower surface of the guide rod 511 is fixedly connected to the upper clamping plate 512. The function of the return spring 513 is to provide elastic support for the downward position of the upper clamping plate 512, so that after the lateral clamping block 56 moves to clamp the sample, it will push the upper clamping plate 512 to always be in contact with the nano-indentation sample.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bidirectional locking adjustable clamping device for polishing nano-indentation samples, characterized in that, Includes a base plate (1), an angle adjustment component (2) is provided on the upper surface of the base plate (1), a column (3) is provided on the surface of the angle adjustment component (2), a sliding plate (4) is slidably connected through the surface of the column (3), a positioning screw (6) is threaded through the side wall of the rear end of the sliding plate (4), and a clamping component (5) is provided on the inner wall of the bottom end of the sliding plate (4). Angle adjustment component (2) is used to fine-tune the angle of the column (3) to achieve clamping and fixing of the tilt angle; Clamping component (5) is used to clamp and fix the nano-indentation sample from multiple angles.

2. The bidirectional locking adjustable clamping device for polishing nano-indentation samples according to claim 1, characterized in that, The clamping assembly (5) includes a rotating block (51), which is rotatably connected to the end of the sliding plate (4) away from the column (3). The rotating block (51) is fixedly connected to a bidirectional threaded rod (52) at its rotation center axis. Two sets of trapezoidal blocks (53) are threadedly connected to the surface of the bidirectional threaded rod (52). A connecting plate (54) is fixedly connected to the lower surface of both sets of trapezoidal blocks (53). A precision screw (55) is threadedly connected to the rear end of the connecting plate (54). A lateral clamping block (56) is fixedly connected to the front end of the precision screw (55).

3. The bidirectional locking adjustable clamping device for polishing nano-indentation samples according to claim 1, characterized in that, The angle adjustment component (2) includes a fixing block (22), the inner side wall of the fixing block (22) is rotatably connected to a rotating shaft (23), the fixing block (22) is fixedly connected to the upper surface of the base plate (1), the upper surface of the base plate (1) is fixedly connected to a guide ring (21), and the rear end of the column (3) is threadedly connected to a locking screw (24).

4. The bidirectional locking adjustable clamping device for polishing nano-indentation samples according to claim 2, characterized in that, The outer sidewall of the connecting plate (54) is provided with a slanted groove (57), and the outer sidewall of the lateral clamping block (56) is provided with a vertical groove (58). The inner sidewalls of the slanted groove (57) and the vertical groove (58) are connected by a protruding rod (59). The rear end of the protruding rod (59) is fixedly connected to an L rod (510). The top surface of the L rod (510) is elastically connected to a guide rod (511) through a reset spring (513). The lower surface of the guide rod (511) is fixedly connected to an upper pressing plate (512).

5. The bidirectional locking adjustable clamping device for polishing nano-indentation samples according to claim 2, characterized in that, The positioning screw (6) passes through one end of the sliding plate (4) and contacts the outer sidewall of the column (3).

6. The bidirectional locking adjustable clamping device for polishing nano-indentation samples according to claim 2, characterized in that, The bidirectional threaded rod (52) is rotatably connected to the inner wall of the bottom end of the sliding plate (4), the trapezoidal block (53) is slidably connected to the inner wall of the bottom end of the sliding plate (4), the inner side of the connecting plate (54) has a cavity, and the lateral clamping block (56) is slidably connected to the inner wall of the cavity of the connecting plate (54).

7. The bidirectional locking adjustable clamping device for polishing nano-indentation samples according to claim 3, characterized in that, The rotating shaft (23) is fixedly connected to the outer wall at the bottom of the column (3).

8. The bidirectional locking adjustable clamping device for polishing nano-indentation samples according to claim 3, characterized in that, The surface of the guide ring (21) is provided with a through guide groove, the outer wall of the locking screw (24) is in contact with the inner side wall of the guide groove of the guide ring (21), and the guide groove of the guide ring (21) is opened at the rotation center point of the rotating shaft (23).

9. The bidirectional locking adjustable clamping device for polishing nano-indentation samples according to claim 4, characterized in that, The inner sidewall of the L-bar (510) is in contact with the surface of the front end of the lateral clamping block (56).

10. The bidirectional locking adjustable clamping device for polishing nano-indentation samples according to claim 4, characterized in that, One end of the reset spring (513) is fixedly connected to the inner side wall of the guide rod (511), and the other end of the reset spring (513) is fixedly connected to the upper surface of the L rod (510). The guide rod (511) passes through and is slidably connected to the inner wall of the L rod (510).

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