Fixtures and slice test equipment

Abstract

The present application relates to a fixing device and a slice test device, wherein the fixing device comprises a fixing seat, a clamping assembly and a knob, wherein the clamping assembly is used to clamp the sample; the knob is rotatably connected to the fixing seat, and the knob is fixedly connected to the clamping assembly, and the knob is configured to rotate to drive the clamping assembly to move along a first direction to adjust the relative position of the sample and the fixing seat, wherein the first direction is parallel to the axial direction of the rotation axis of the knob. Compared with the existing test personnel manually operating the sample, the fixing device provided in the present application clamps the sample through the clamping assembly, thereby reducing the shaking of the sample during the test and improving the stability of the sample during the test. Moreover, the knob can drive the sample to move along the first direction, which is convenient for accurately controlling the displacement of the sample along the first direction, and reducing the deviation of the slice, the situation of not being in place, and the situation of over-cutting.

Description

Technical Field

[0001] The present application relates to the technical field of circuit board detection, and in particular to a fixing device and a slicing test device. Background Art

[0002] Slice testing is a testing method used to observe the internal process quality of PCBs, PCBAs and enclosed components. By accurately cutting, grinding and polishing the target area, the target area of ​​the sample is fully exposed, so that the internal structure of the sample can be observed intuitively. In related technologies, when performing slice testing, the tester manually places the sample on a grinding disc for grinding and polishing. The angle and depth of the slices are determined by the operator's experience, which often causes the slices to be offset, not cut in place, cut too far, or even injure the operator. Utility Model Content

[0003] Based on this, it is necessary to provide a fixing device and a slice testing equipment to solve the problem of sample fixing.

[0004] A fixing device, comprising:

[0005] Fixed seat;

[0006] A clamping assembly, used for clamping a sample;

[0007] A knob is rotatably connected to the fixing base, and the knob is fixedly connected to the clamping assembly. The knob is configured to rotate relative to the fixing base to drive the clamping assembly to move along a first direction to adjust the relative position of the sample and the fixing base, wherein the first direction is parallel to the axial direction of the rotation axis of the knob.

[0008] The above-mentioned fixing device improves the stability of fixing the sample during the test process by setting a clamping assembly to clamp the sample. The clamping assembly is connected to the fixing seat through a knob, and the knob is turned to drive the clamping assembly and the sample clamped by the clamping assembly to move along the first direction, thereby adjusting the relative position of the sample and the fixing seat, which is convenient for subsequent grinding processing. Compared with the existing test personnel manually operating the sample, the fixing device provided in the present application clamps the sample through the clamping assembly, which reduces the shaking of the sample during the test process and improves the stability of the sample during the test process. Moreover, the knob can drive the sample to move along the first direction, which is convenient for accurately controlling the displacement of the sample along the first direction, reducing the deviation of the slice, and the situation of not being in place and over-cutting.

[0009] In one embodiment, the fixing base includes a chassis, a connecting arm and a sleeve, one end of the connecting arm is connected to the chassis, and the other end is connected to the sleeve, the knob at least partially extends into the sleeve and rotates with the sleeve to switch the rotational motion of the knob into linear motion.

[0010] By arranging a connecting arm to connect the chassis and the sleeve, the chassis increases the contact area between the connecting arm and the bottom surface or the mounting platform, thereby improving the mounting stability. The knob is configured to at least partially extend into the sleeve, and the sleeve and the knob are rotated to rotate the knob, thereby switching the rotary motion of the knob to linear motion, thereby driving the clamping assembly connected to the knob and the sample clamped by the clamping assembly to move along the first direction.

[0011] In one embodiment, the knob includes a hand-held portion and a straight rod portion, the hand-held portion is arranged at one end of the straight rod portion and is located outside the sleeve, the straight rod portion at least partially extends into the sleeve and is threadedly engaged with the sleeve, and the end of the straight rod portion facing away from the hand-held portion is connected to the clamping assembly.

[0012] By setting a straight rod portion, at least a portion of the straight rod portion can be extended into the sleeve, and the thread on the straight rod portion can mesh with the thread on the inner wall of the sleeve. A hand-held portion is provided at one end of the straight rod portion, and the hand-held portion is located outside the sleeve, which is convenient for human handholding. When the knob of the present application is in use, the straight rod portion can be driven to rotate by holding the hand-held portion, thereby driving the clamping assembly connected to the straight rod portion to move along the first direction. Moreover, by controlling the number of turns of the knob, the distance that the clamping assembly and the sample move along the first direction can be controlled, and the movement of the sample along the first direction is precisely controlled by the threaded cooperation of the straight rod portion and the sleeve.

[0013] In one embodiment, the straight rod portion is provided with a cavity, and a boss is provided on the cavity wall of the cavity;

[0014] The clamping assembly includes a connected clamping arm and a mounting member, the mounting member is used to clamp the sample, and an end of the clamping arm away from the mounting member is provided with an outwardly bent flange, and the clamping arm is configured to extend into the cavity so that the flange overlaps the boss.

[0015] The end of the clamping arm away from the mounting piece is provided with an outwardly bent flange, and the flange is overlapped with the boss, thereby realizing the connection between the clamping assembly and the knob.

[0016] In one of the embodiments, it further includes an elastic member disposed in the cavity, two ends of the elastic member respectively abut against the flange and the cavity wall of the cavity, and the elastic deformation direction of the elastic member is parallel to the first direction.

[0017] By arranging an elastic member in the cavity, the two ends of the elastic member respectively abut against the flange and the cavity wall, and the elastic member can provide a pre-tightening force to the clamping arm so that the clamping arm always moves in the first direction away from the knob.

[0018] In one embodiment, the clamping assembly includes a clamping arm and a mounting member connected to each other, the clamping arm is connected to the knob, and the mounting member includes:

[0019] A first ring, rotatably connected to the clamping arm, wherein the first ring surrounds and forms a first space for accommodating at least a portion of the sample;

[0020] A group of relatively arranged spring sheets are connected to the first ring. The spring sheets are at least partially arranged in the first space. The group of relatively arranged spring sheets can move relatively and abut against the sample to clamp the sample.

[0021] By providing the first ring, the sample can be partially provided in the first space formed by the first ring, and by providing a group of relatively arranged spring sheets, the group of relatively arranged spring sheets can move relatively and abut against the sample, thereby clamping the sample.

[0022] In one embodiment, the mounting member further includes a second ring disposed in the first space, the second ring rotatably cooperates with the first ring, the second ring surrounds and forms a second space for accommodating at least a portion of the sample, and the spring sheet is at least partially disposed in the second space.

[0023] By arranging the second ring in the first space, that is, the second ring is sleeved in the first ring, and the second ring is surrounded to form the second space, the sample placement position is further limited. Moreover, the first ring and the second ring are rotatably matched, and the relative position of the first ring and the second ring can be adjusted before clamping the sample, which is suitable for clamping samples of different models, specifications, and shapes.

[0024] In one embodiment, the spring sheet includes an abutment portion and an adjustment portion, the abutment portion is disposed in the second space, the adjustment portion passes through the first ring and the second ring and is connected to the abutment portion, and the adjustment portion is threadedly engaged with the first ring and the second ring.

[0025] By setting the adjusting part to cooperate with the first ring and the second ring in threaded connection, the adjusting part can be rotated to drive the abutting part correspondingly connected to the adjusting part to move, so that the abutting part abuts against the sample.

[0026] In one embodiment, the clamping arm includes a connecting portion and a mounting portion connected to each other, the connecting portion is connected to the knob, the mounting portion is provided with a chamber for accommodating the first ring, and the first ring is rotatably connected to a cavity wall of the chamber.

[0027] By setting the connecting part, a flange is set on the side of the connecting part away from the mounting part, and the connecting part can extend into the cavity so that the flange overlaps the boss. A cavity is set on the side of the mounting part away from the connecting part to accommodate the first ring and the second ring.

[0028] The present application also provides a slicing test device, comprising a grinding disc and any one of the fixing devices described above, wherein the grinding disc is used to grind the sample.

[0029] The sample is fixed on the fixing device, and the clamping assembly and the sample are driven to move along the first direction by turning the knob, thereby adjusting the relative position between the sample and the grinding disc and controlling the grinding degree. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the fixing device provided in this application.

[0031] Figure 2 for Figure 1 Enlarged view at A.

[0032] Figure 3 A cross-sectional view of the fixing device provided in this application.

[0033] Figure 4 for Figure 3 Enlarged view at B.

[0034] Figure 5 for Figure 3 Enlarged view at C.

[0035] In the figure:

[0036] 100, knob; 110, handle; 120, straight rod;

[0037] 200, chassis;

[0038] 300, connecting arm;

[0039] 400, sleeve;

[0040] 500, clamping arm; 511, connecting portion; 520, mounting portion; 530, flange;

[0041] 600, mounting member; 610, first ring; 620, spring piece; 621, abutting portion; 622, adjusting portion; 630, second ring;

[0042] 700. Elastic parts. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0044] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0045] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0047] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0049] The existing testing methods all rely on the test personnel to manually place the sample on the grinding disc for grinding and polishing. The angle and depth of the slices are all judged by the operator's experience, which often causes the slices to be offset, not cut in place, cut too far, or even injure the operator. The specific problems are as follows:

[0050] 1) When people hold the sample by hand for cutting, they cannot accurately control the cutting angle, resulting in a decrease in the success rate of slicing;

[0051] 2) When cutting samples manually, it is impossible to control the cutting depth. The observation position is often accurate to the micron level. Too shallow or too deep will affect the test results.

[0052] 3) Cutting machines, grinders, and polishers are used when cutting samples. Direct manual operation may also cause certain safety hazards. If the grip is too loose, the sample may fall out, and if it is too tight, there may be a risk of injury.

[0053] 4) The slicing test process is too long. Long-term operation will lead to a waste of manpower, and as the test time increases, the operator cannot always maintain the standard operation method.

[0054] To this end, the present application provides a fixing device, such as Figures 1 to 5As shown, the fixing device includes a fixing seat, a clamping assembly and a knob 100, wherein the clamping assembly is used to clamp the sample; the knob 100 is rotatably connected to the fixing seat, and the knob 100 is fixedly connected to the clamping assembly, and the knob 100 is configured to rotate to drive the clamping assembly to move along a first direction to adjust the relative position of the sample and the fixing seat, wherein the first direction is parallel to the axial direction of the rotation axis of the knob 100.

[0055] The above-mentioned fixing device improves the stability of fixing the sample during the test process by setting a clamping assembly to clamp the sample. The clamping assembly is connected to the fixing seat through a knob, and the knob 100 is rotated to drive the clamping assembly and the sample clamped by the clamping assembly to move along the first direction, thereby adjusting the relative position of the sample and the fixing seat, which is convenient for subsequent grinding processing. Compared with the existing test personnel manually operating the sample, the fixing device provided by the present application clamps the sample through the clamping assembly, which reduces the shaking of the sample during the test process and improves the stability of the sample during the test process. Moreover, the knob 100 can drive the sample to move along the first direction, which is convenient for accurately controlling the displacement of the sample along the first direction, reducing the deviation of the slice, and the situation of not being in place and over-cutting.

[0056] In some embodiments, Figures 1 to 5 As shown, the fixing seat includes a chassis 200, a connecting arm 300 and a sleeve 400, one end of the connecting arm 300 is connected to the chassis 200, and the other end is connected to the sleeve 400, and the knob 100 at least partially extends into the sleeve 400, and rotates with the sleeve 400 to switch the rotary motion of the knob 100 to a linear motion. By setting the connecting arm 300 to connect the chassis 200 and the sleeve 400, the chassis 200 increases the contact area between the connecting arm 300 and the ground or the mounting platform, and improves the installation stability. The knob 100 is configured to at least partially extend into the sleeve 400, and through the rotational cooperation of the sleeve 400 and the knob 100, the knob 100 is rotated, so that the rotary motion of the knob 100 is switched to a linear motion, which can drive the clamping assembly connected to the knob 100 and the sample clamped by the clamping assembly to move along the first direction.

[0057] Specifically, Figures 1 to 5 As shown, the connecting arm 300 is in an arc shape.

[0058] Specifically, Figures 1 to 5As shown, the knob 100 includes a hand-held portion 110 and a straight rod portion 120. The hand-held portion 110 is arranged at one end of the straight rod portion 120 and is located outside the sleeve 400. The straight rod portion 120 at least partially extends into the sleeve 400 and is threadedly matched with the sleeve 400. One end of the straight rod portion 120 away from the hand-held portion 110 is connected to the clamping assembly. By providing the straight rod portion 120, the thread on the straight rod portion 120 can be engaged with the thread in the sleeve 400. The hand-held portion 110 is arranged at one end of the straight rod portion 120, and the hand-held portion 110 is located outside the sleeve 400, which is convenient for human hand holding. When the knob 100 of the present application is used, by holding the hand-held portion 110, the straight rod portion 120 can be driven to rotate, thereby driving the clamping assembly connected to the straight rod portion 120 to move along the first direction. Moreover, by controlling the number of turns of the knob 100, the distance that the clamping assembly and the sample move along the first direction can be controlled. Through the threaded cooperation between the straight rod portion 120 and the sleeve 400, the movement of the sample along the first direction is precisely controlled.

[0059] More specifically, if Figures 1 to 5 As shown, an external thread is provided on the straight rod portion 120, and an internal thread is provided on the sleeve 400, and the axial directions of the external thread and the internal thread are both parallel to the first direction.

[0060] Specifically, Figures 1 to 5 As shown, the straight rod portion 120 is provided with a cavity, and a boss is provided on the cavity wall of the cavity; the clamping assembly includes a clamping arm 500 and a mounting member 600 connected to each other, the mounting member 600 is used to clamp the sample, and the end of the clamping arm 500 away from the mounting member 600 is provided with an outwardly bent flange 530, and the clamping arm 500 is configured to extend into the cavity so that the flange 530 overlaps the boss. By providing an outwardly bent flange 530 at one end of the clamping arm 500 away from the mounting member 600, and the flange 530 overlaps the boss, the connection between the clamping assembly and the knob 100 is achieved.

[0061] Specifically, Figures 1 to 5 As shown, the elastic member 700 is also provided in the cavity, and the two ends of the elastic member 700 are respectively in contact with the flange 530 and the cavity wall of the cavity, and the elastic deformation direction of the elastic member 700 is parallel to the first direction. By providing the elastic member 700 in the cavity, and the two ends of the elastic member 700 are respectively in contact with the flange 530 and the cavity wall of the cavity, the elastic member 700 can provide a pre-tightening force to the clamping arm 500, so that the clamping arm 500 always moves in the first direction away from the knob 100.

[0062] In some embodiments, Figures 1 to 5As shown, the clamping assembly includes a clamping arm 500 and a mounting member 600 connected to each other, the clamping arm 500 is connected to the knob 100, and the mounting member 600 includes a first ring 610 and a group of relatively arranged spring pieces 620, the first ring 610 is rotatably connected to the clamping arm 500, and the first ring 610 is arranged to form a first space for accommodating at least a part of the sample area; a group of relatively arranged spring pieces 620 are all connected to the first ring 610, and the spring pieces 620 are at least partially arranged in the first space, and a group of relatively arranged spring pieces 620 can move relative to each other and abut against the sample to clamp the sample. By setting the first ring 610, the sample can be partially arranged in the first space surrounded by the first ring 610, and by setting the group of relatively arranged spring pieces 620, a group of relatively arranged spring pieces 620 can move relative to each other and abut against the sample, thereby clamping the sample.

[0063] In other embodiments, a plurality of spring pieces 620 may be provided, and the plurality of spring pieces 620 may be grouped in pairs. The plurality of groups of relatively provided spring pieces 620 may cooperate with each other and may abut against the sample, thereby improving the stability of clamping the sample.

[0064] Specifically, Figures 1 to 5 As shown, the mounting member 600 further includes a second ring 630 disposed in the first space, the second ring 630 and the first ring 610 are rotatably matched, the second ring 630 is enclosed to form a second space for accommodating at least a portion of the sample, and the spring piece 620 is at least partially disposed in the second space. By arranging the second ring 630 in the first space, that is, the second ring 630 is sleeved in the first ring 610, and the second ring 630 is enclosed to form the second space, the setting position of the sample is further limited. Moreover, the first ring 610 and the second ring 630 are rotatably matched, and the relative positions of the first ring 610 and the second ring 630 can be adjusted before clamping the sample, which is suitable for clamping samples of different models, specifications, and shapes.

[0065] Specifically, Figures 1 to 5 As shown, the spring piece 620 includes an abutting portion 621 and an adjusting portion 622. The abutting portion 621 is arranged in the second space, and the adjusting portion 622 passes through the first ring 610 and the second ring 630 and is connected to the abutting portion 621. The adjusting portion 622 is threadedly engaged with the first ring 610 and the second ring 630. By setting the adjusting portion 622 to be threadedly engaged with the first ring 610 and the second ring 630, the adjusting portion 622 is rotated to drive the abutting portion 621 correspondingly connected to the adjusting portion 622 to move, so that the abutting portion 621 abuts against the sample.

[0066] It should be noted that, in the process of clamping the sample, one of the relatively arranged spring pieces 620 can be adjusted, or two spring pieces 620 can be adjusted, as long as the abutting portions 621 of the two spring pieces 620 can abut against the sample.

[0067] Specifically, Figures 1 to 5 As shown, the adjusting portion 622 is rod-shaped and is provided with external threads. Both the first ring 610 and the second ring 630 are provided with threaded holes, and the adjusting portion 622 is inserted through the threaded holes of the first ring 610 and the second ring 630 .

[0068] Specifically, Figures 1 to 5 As shown, the first ring 610 and the second ring 630 are concentrically arranged.

[0069] Specifically, Figures 1 to 5 As shown, the clamping arm 500 includes a connecting portion 511 and a mounting portion 520 connected to each other. The connecting portion 511 is connected to the knob 100. The mounting portion 520 is provided with a cavity for accommodating the first ring 610. The first ring 610 is rotatably connected to the cavity wall of the cavity. By providing the connecting portion 511, a flange 530 is provided on the side of the connecting portion 511 away from the mounting portion 520. The connecting portion 511 can extend into the cavity, so that the flange 530 overlaps the boss. The mounting portion 520 is provided with a cavity on the side away from the connecting portion 511 to facilitate accommodating the first ring 610 and the second ring 630.

[0070] It should be noted that the chamber on the mounting portion 520 is connected to the outside, the first ring 610 is rotatably connected to the cavity wall of the chamber, and the second ring 630 is rotatably connected to the first ring 610 through the adjusting portion 622 of the spring 620 .

[0071] Specifically, Figures 1 to 5 As shown, the clamp arm 500 is Y-shaped.

[0072] In summary, the beneficial effects of the fixing device of the present application are as follows:

[0073] 1) The fixing device can accurately adjust and fix the sample angle, and always accurately maintain the initial slicing angle during the slicing process;

[0074] 2) The sectioning depth can be precisely adjusted by the knob 100. The sectioning depth can be observed by the scale while the knob 100 is locked. When locked, the internal spring is compressed to ensure that the sample has a continuous vertical downward movement trend and the sample is pressed on the grinding disc;

[0075] 3) After selecting the slice depth by adjusting the knob 100, the automatic grinding function can be realized, which can free up manpower;

[0076] 4) Human hands do not directly perform slicing actions, which can improve slicing accuracy and safety.

[0077] The present application also provides a slicing test device, comprising a grinding disc and any of the above-mentioned fixing devices, wherein the grinding disc is used to grind a sample. The sample is fixed on the fixing device, and the knob 100 is used to drive the clamping assembly and the sample to move along a first direction, thereby adjusting the relative position between the sample and the grinding disc and controlling the grinding degree.

[0078] This application also provides a method for using the slice test device:

[0079] 1) Cold embedding the target sample with epoxy resin glue and vacuum treatment;

[0080] 2) After the resin is cured, fix the sample on the fixture and adjust the slicing angle and slicing depth;

[0081] 3) Use slice test equipment for fixed angle grinding;

[0082] 4) Use slice test equipment for fixed angle polishing;

[0083] 5) Use a metallographic microscope to take appearance pictures;

[0084] 6) Save the image and measurement results, and the experiment is completed.

[0085] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A fixing device, characterized in that: The fixing device comprises: Fixed seat; A clamping assembly, used for clamping a sample; A knob is rotatably connected to the fixing base, and the knob is fixedly connected to the clamping assembly. The knob is configured to rotate relative to the fixing base to drive the clamping assembly to move along a first direction to adjust the relative position of the sample and the fixing base, wherein the first direction is parallel to the axial direction of the rotation axis of the knob.

2. The fixing device according to claim 1, characterized in that: The fixing seat includes a chassis, a connecting arm and a sleeve, one end of the connecting arm is connected to the chassis, and the other end is connected to the sleeve, the knob at least partially extends into the sleeve and rotates with the sleeve to switch the rotational motion of the knob into linear motion.

3. The fixing device according to claim 2, characterized in that: The knob includes a hand-held portion and a straight rod portion. The hand-held portion is arranged at one end of the straight rod portion and is located outside the sleeve. The straight rod portion at least partially extends into the sleeve and is threadedly engaged with the sleeve. The end of the straight rod portion facing away from the hand-held portion is connected to the clamping assembly.

4. The fixing device according to claim 3, characterized in that: The straight rod portion is provided with a cavity, and a boss is provided on the cavity wall of the cavity; The clamping assembly includes a connected clamping arm and a mounting member, the mounting member is used to clamp the sample, and an end of the clamping arm away from the mounting member is provided with an outwardly bent flange, and the clamping arm is configured to extend into the cavity so that the flange overlaps the boss.

5. The fixing device according to claim 4, characterized in that: It also includes an elastic member arranged in the cavity, two ends of the elastic member are respectively in contact with the flange and the cavity wall of the cavity, and the elastic deformation direction of the elastic member is parallel to the first direction.

6. The fixing device according to claim 1, characterized in that: The clamping assembly comprises a clamping arm and a mounting member connected to each other, wherein the clamping arm is connected to the knob, and the mounting member comprises: A first ring, rotatably connected to the clamping arm, wherein the first ring surrounds and forms a first space for accommodating at least a portion of the sample; A group of relatively arranged spring sheets are connected to the first ring. The spring sheets are at least partially arranged in the first space. The group of relatively arranged spring sheets can move relatively and abut against the sample to clamp the sample.

7. The fixing device according to claim 6, characterized in that: The mounting member also includes a second ring disposed in the first space, the second ring and the first ring are rotatably matched, the second ring surrounds a second space for accommodating at least a partial area of ​​the sample, and the spring sheet is at least partially disposed in the second space.

8. The fixing device according to claim 7, characterized in that: The spring sheet includes an abutment portion and an adjustment portion, the abutment portion is arranged in the second space, the adjustment portion passes through the first ring and the second ring and is connected to the abutment portion, and the adjustment portion is threadedly matched with the first ring and the second ring.

9. The fixing device according to claim 6, characterized in that: The clamping arm comprises a connecting portion and a mounting portion which are connected to each other, wherein the connecting portion is connected to the knob, and the mounting portion is provided with a cavity for accommodating the first ring, and the first ring is rotatably connected to a cavity wall of the cavity.

10. A slice testing device, characterized in that: It comprises a grinding disc and the fixing device according to any one of claims 1 to 9, wherein the grinding disc is used for grinding the sample.

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