Clamp for preparing metallographic specimen, control method and grinding and polishing platform

Abstract

The invention provides a clamp for preparing a metallographic specimen, a control method and a grinding and polishing platform. The clamp comprises a base, at least two sets of clamping assemblies and a pressure feedback module. Wherein the clamping assemblies are symmetrically installed on the base and used for clamping a metallographic specimen, the pressure feedback module comprises a detection end and a feedback end which are electrically connected with each other, and the detection end and the feedback end are installed on the two side faces of the base respectively; when the metallographic specimen is clamped and fixed by the clamping assembly, the detection end abuts against the back face of the metallographic specimen and is used for collecting pressure information borne by the metallographic specimen. And the feedback end is used for converting the pressure information into text and sound forms and outputting. Compared with a traditional sample clamp, the clamp has the advantages that researchers can know the compression condition of the metallographic sample during grinding and polishing at any time by means of text and sound information fed back by the pressure feedback module, and the researchers can conveniently apply stable grinding and polishing force to guarantee the preparation quality and effect of the metallographic sample; and the preparation convenience of the metallographic specimen is improved.

Description

Technical Field

[0001] The invention relates to the technical field of metallographic preparation, and specifically provides a fixture, a control method and a grinding and polishing platform for preparing a metallographic sample. Background Art

[0002] Metallographic specimens play a vital role in the field of materials science and engineering, and are the basis for the analysis of material microstructures. By observing metallographic specimens, researchers can clearly understand the microscopic characteristics of materials, such as the organizational morphology, phase distribution, and defects. If the specimens are not prepared properly, the observation results may be distorted, or even wrong conclusions may be drawn.

[0003] In the process of preparing metallographic samples, a common polishing method is that researchers hold the clamp and rely on personal experience to control the strength so that the surface of the metallographic sample can be ground and polished within a reasonable pressure range. When researchers prepare different metallographic samples, they need to adjust the pressure of the metallographic samples based on experience. During the grinding and polishing process, researchers need to repeatedly adjust the strength of the clamp they hold. The preparation of metallographic samples is inconvenient and inefficient. Existing clamps are difficult to assist researchers in preparing metallographic samples. Summary of the invention

[0004] The invention aims to solve the problem that the existing clamp is inconvenient to use in assisting the preparation of metallographic samples.

[0005] The purpose of the present invention is to adopt the following technical solutions to achieve:

[0006] The present invention provides a clamp for preparing a metallographic sample, comprising: a base; at least two sets of clamping components, the clamping components are symmetrically mounted on the base for clamping the metallographic sample; and a pressure feedback module, which comprises a detection end and a feedback end electrically connected to each other, the detection end and the feedback end are respectively mounted on two side surfaces of the base; when the metallographic sample is clamped and fixed by the clamping components, the detection end of the pressure feedback module abuts against the back side of the metallographic sample to collect pressure information on the metallographic sample; the feedback end of the pressure feedback module is used to convert the pressure information into text and sound forms for output.

[0007] Preferably, the base includes a substrate, an annular body and a support column; the annular body and the support column are both fixed on the surface of one side of the substrate, two sets of the clamping assemblies are symmetrically installed on the annular body, the detection end of the pressure feedback module is installed on the end of the support column, and the feedback end of the pressure feedback module is installed on the surface of the other side of the substrate.

[0008] Preferably, the feedback end of the pressure feedback module includes a control subunit and an information output unit electrically connected to the control subunit, the control subunit converts the received pressure information into a digital electrical signal, and the information output unit converts the digital electrical signal into the text and the sound.

[0009] Preferably, the information output unit includes a liquid crystal display and a speaker.

[0010] Preferably, the detection end of the pressure feedback module includes a pressure sensor electrically connected to the control subunit.

[0011] Preferably, the clamping assembly includes: a first adjusting bolt, which is arranged along the radial direction of the annular body and connected to the rotating shaft of the annular body; a sliding block, which is sleeved on the first adjusting bolt and threadedly cooperates with the first adjusting bolt; a limiting column, one end of which is fixed on the supporting column, the limiting column is arranged parallel to the first adjusting bolt, and the sliding block is axially slidably connected to the limiting column; a clamping jaw, which is fixed on the sliding block, and the clamping jaw is arranged toward the supporting column; when the first adjusting bolt is adjusted to rotate, the first adjusting bolt drives the sliding block to move, and the sliding block slides on the limiting column to drive the clamping jaw to clamp the sample.

[0012] Preferably, the first adjusting bolt comprises a bolt body and a nut, a convex ring and an external thread sequentially formed on the bolt body; the nut is located on the outer side of the annular body, and the convex ring is located on the inner side of the annular body.

[0013] Preferably, the number of the clamping assemblies is four, and the first adjusting bolts in the four sets of the clamping assemblies are distributed in a cross shape along the annular body.

[0014] Preferably, the clamp further comprises a protective member, and the protective member is sleeved on the outer side wall of the support column.

[0015] Preferably, the clamp further comprises a handle, both ends of which are mounted on the surface of the other side of the base plate; one end of the handle is hinged to the base plate, and the other end of the handle is screwed to the base plate via a second adjusting bolt.

[0016] Preferably, a guide column is provided on the handle, and the guide column is located at one end where the handle is hinged to the base plate, and the guide column is slidably connected to an auxiliary bracket of the grinding and polishing platform.

[0017] Based on the same inventive concept, the present invention also provides a control method for the fixture for preparing metallographic samples, the control method comprising: when the metallographic sample is clamped and fixed by the fixture; using the detection end of the pressure feedback module to press against the back of the metallographic sample to obtain the pressure information of the metallographic sample; using the feedback end of the pressure feedback module to convert the pressure information into text and sound form for output.

[0018] Preferably, the use of the feedback end of the pressure feedback module to convert the pressure information into text and sound output includes: using the control subunit of the feedback end to convert the pressure information into a digital electrical signal; using a liquid crystal display and a speaker in the information output unit of the feedback end to convert the digital electrical signal into text and sound output respectively.

[0019] Based on the same inventive concept, the present invention also provides a grinding and polishing platform, including the fixture for preparing metallographic samples.

[0020] Preferably, the grinding and polishing platform includes an auxiliary bracket, and the auxiliary bracket is slidably connected to the handle of the clamp.

[0021] Preferably, the auxiliary bracket has a horizontal cantilever with a plate-like structure, a vertical guide hole is provided on the horizontal cantilever, and the guide column on the handle is slidably matched with the guide hole.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The clamp for preparing metallographic samples provided by the present invention includes a base, at least two sets of clamping components and a pressure feedback module. The clamping components are symmetrically installed on the base for clamping the metallographic sample, and the pressure feedback module includes a detection end and a feedback end electrically connected to each other, and the detection end and the feedback end are respectively installed on the two side surfaces of the base; when the metallographic sample is clamped and fixed by the clamping component, the detection end of the pressure feedback module abuts against the back of the metallographic sample to collect the pressure information of the metallographic sample; the feedback end of the pressure feedback module is used to convert the pressure information into text and sound output. Compared with the traditional sample clamp, the clamp of the present invention can use the text and sound information fed back by the pressure feedback module to enable researchers to know the pressure of the metallographic sample at any time during grinding and polishing, which is convenient for researchers to apply a steady grinding and polishing force to ensure the preparation quality and effect of the metallographic sample, and improve the convenience of metallographic sample preparation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A bottom view of the bottom structure of the clamp of the present invention;

[0025] Figure 2 for Figure 1Schematic diagram of the cross-sectional structure at AA in the middle;

[0026] Figure 3 A top view of the top structure of the clamp of the present invention;

[0027] Figure 4 It is a schematic diagram of the partial structure of the assembly between the fixture of the present invention and the grinding and polishing platform.

[0028] Figure markings: 1-base; 11-annular body; 111-threaded hole; 12-substrate; 121-support column; 122-limiting column; 123-liquid crystal display; 124-speaker; 125-touch button; 2-protective member; 3-first adjusting bolt; 31-nut; 32-convex ring; 4-slider; 5-clamping jaw; 51-screw; 6-pressure sensor; 71-handle; 72-guide column; 73-second adjusting bolt; 8-metallographic specimen; 91-grinding disc; 92-auxiliary bracket. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] In the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Example 1

[0033] like Figures 1 to 3As shown, an embodiment of the present invention provides a fixture for preparing a metallographic sample, the fixture comprising a base 1, at least two sets of clamping components and a pressure feedback module. The two sets of clamping components are symmetrically mounted on the base 1 for clamping the metallographic sample 8, the pressure feedback module comprises a detection end and a feedback end electrically connected to each other, and the detection end and the feedback end are respectively mounted on the two side surfaces of the base 1; when the metallographic sample 8 is clamped and fixed by the clamping component, the detection end of the pressure feedback module abuts against the back of the metallographic sample 8, and is used to collect the pressure information of the metallographic sample 8; the feedback end of the pressure feedback module is used to convert the pressure information into text and sound output.

[0034] Specifically, Figure 1 and Figure 2 As shown, the base 1 of the embodiment of the present invention includes a circular substrate 12 and an annular body 11. Among them, a support column 121 is provided on the substrate 12, the annular body 11 and the support column 121 are both fixed on the lower surface of the substrate 11, the support column 121 is arranged on the central axis of the annular body 11, and two sets of clamping components are symmetrically installed on the annular body 11. The detection end of the pressure feedback module is installed at the end of the support column 121, and the feedback end of the pressure feedback module is installed on the upper surface of the substrate 12.

[0035] More specifically, the feedback end of the pressure feedback module includes a control subunit and an information output unit electrically connected to the control subunit. The control subunit converts the received pressure information into digital electrical signals, and the information output unit converts the digital electrical signals into text and sound.

[0036] like Figure 1 and Figure 2 As shown, the detection end of the pressure feedback module includes a pressure sensor 6 electrically connected to the control subunit, and the pressure sensor 6 is installed at the lower end of the support column 121. The information output unit includes a liquid crystal display 123 and a speaker 124, and the control subunit is configured as a controller with a touch button 125.

[0037] The received pressure information can be converted into a digital electrical signal by the control subunit, and the pressure value information is displayed through the LCD screen 123, and the pressure value information is outputted through the speaker 124. In addition, by touching the button 125, the controller can also set or clear the pressure value displayed on the LCD screen 123.

[0038] Continue reading Figure 1 and Figure 2 Along the thickness direction of the annular body 11, four threaded holes 111 are provided on the annular body 11, and four through holes (not shown in the figure) corresponding to the four threaded mounting holes are provided on the base plate 12. Screws pass through the through holes and are screwed to the threaded holes 111 on the annular body 11 to fix the base plate 12 and the annular body 11.

[0039] like Figure 1 As shown, the clamp of the embodiment of the present invention adopts four sets of clamping components, and the four sets of clamping components are distributed in a "cross" shape along the annular body 11.

[0040] Specifically, Figure 2 As shown, each set of clamping components includes a first adjusting bolt 3, a slider 4, a limiting column 122 and a clamping jaw 5. The first adjusting bolt 3 is arranged along the radial direction of the annular body 11 and is connected to the rotating shaft of the annular body 11, the slider 4 is sleeved on the first adjusting bolt 3 and is threadedly matched with the first adjusting bolt 3, one end of the limiting column 122 is fixed on the support column 121 and the limiting column 122 is arranged parallel to the axial direction of the first adjusting bolt 3, and the clamping jaw 5 is fixed on the slider 4 and the clamping jaw 5 is arranged toward the support column 121.

[0041] The annular body 11 is provided with four axial holes in the radial direction (not shown in the figure), the first adjusting bolt 3 includes a bolt body and a nut 31, a convex ring 32 and an external thread formed on the bolt body in sequence, the nut 31 is located on the radial outer side of the annular body 11, and the convex ring 32 is located on the radial inner side of the annular body 11. The bolt body between the nut 31 and the convex ring 32 is located in the axial hole and connected to the rotating shaft of the annular body 11. The slider 4 is provided with an internal thread hole and a guide hole arranged in parallel, the external thread of the bolt body is threadedly matched with the internal thread hole of the slider 4, the guide hole of the slider 4 is axially slidably matched with the limit column 122, and the clamp 5 is fixedly connected to the slider 4 through a screw 51.

[0042] When the nut 31 of the first adjusting bolt 3 is driven to rotate, the convex ring 32 is located on the inner side of the annular body 11 to limit the bolt body in the axial direction, the external thread of the bolt body is threadedly connected with the internal thread hole of the slider 4 to drive the slider 4 to move, and the limiting column 122 limits the slider 4 in the circumferential direction to prevent the slider 4 from moving and rotating. The slider 4 drives the clamping jaw 5 to tighten one side of the metallographic sample 8. Through such a setting, each clamping jaw 5 can maintain stable movement to clamp the metallographic sample 8, thereby improving the stability of the metallographic sample 8 during the clamping process.

[0043] In addition, if Figure 2 As shown, the clamp of the embodiment of the present invention further includes a protective member 2, which is sleeved on the outer wall of the support column 121. The protective member 2 is a rubber tube, which is sleeved on the support column 121 to prevent the slider 4 from rigidly squeezing the support column 121 during the movement, thereby causing the support column 121 to tilt, thereby ensuring that the pressure sensor 6 can accurately abut against the back area of ​​the metallographic sample 8.

[0044] like Figure 2As shown, the clamp of the embodiment of the present invention further includes a handle 71, and both ends of the handle 71 are mounted on the surface of the other side of the base plate 12. One end of the handle 71 is hinged to the base plate 12, and the other end of the handle 71 is screwed to the base plate 12 through a second adjusting bolt 73.

[0045] Specifically, a hinge seat and a threaded hole seat are provided on the upper surface of the base plate 12, and the handle 71 of the embodiment of the present invention has a T-shaped structure, the lower end of the head of the T-shaped structure is hinged to the hinge seat of the base plate 12, and the tail of the T-shaped structure is screwed to the threaded hole seat of the base plate 12 through a second adjusting bolt 73. The upper end of the head of the T-shaped structure is slidably connected to the auxiliary bracket 92 of the grinding and polishing platform as a guide column.

[0046] When the metallographic sample 8 is ground and polished by the clamp alone, the second adjusting bolt 73 can be adjusted according to the needs of the researchers so that the holding axis of the handle 71 is at a certain angle to the substrate 12, so as to make it more convenient for the researchers to hold and use, relieve the researchers' hand fatigue, and indirectly adjust the grinding surface of the metallographic sample 8.

[0047] The use principle of the clamp in this embodiment is as follows:

[0048] When the clamp clamps the metallographic sample 8, the pressure sensor 6 on the support column 121 rests against the back of the metallographic sample 8 to obtain the pressure information of the metallographic sample 8 in the axial direction of the support column 121. The pressure information is converted by the control subunit and output through the LCD display 123 combined with the speaker 124, so that researchers can know the pressure condition of the metallographic sample 8 during the grinding and polishing process.

[0049] In addition, if Figure 2 As shown, when the holding clamp does not apply pressure, the touch button 125 is touched or pressed to cause the control subunit to reset the pressure value displayed on the LCD screen 123 to zero.

[0050] When the holding fixture applies a pressure suitable for grinding and polishing the metallographic sample 8, the touch button 125 is touched or pressed to cause the control subunit to set the pressure value displayed on the LCD screen 123 as a reference pressure value.

[0051] Through such operation, during the grinding and polishing process, when the current pressure value on the LCD screen 123 deviates from the reference pressure value range, the speaker 124 is used to remind the researcher to increase or decrease the pressure of the holding clamp.

[0052] Compared with traditional clamps, this clamp can set reference pressure values ​​according to different metallographic samples 8, so that researchers can know and control the appropriate and stable force at any time during the grinding and polishing process, thereby ensuring the polishing quality of the metallographic sample 8 and improving the efficiency and convenience of preparing the metallographic sample 8.

[0053] Example 2

[0054] like Figure 1 and Figure 2 As shown, based on the same inventive concept, an embodiment of the present invention provides a control method for a fixture for preparing a metallographic sample based on embodiment 1, and the control method includes:

[0055] When the metallographic specimen 8 is clamped and fixed by the fixture;

[0056] S1, using the detection end of the pressure feedback module to press against the back of the metallographic sample 8 to obtain the pressure information of the metallographic sample 8;

[0057] S2. Use the feedback end of the pressure feedback module to convert the pressure information into text and sound output.

[0058] Wherein, step S2 comprises:

[0059] S21, using the control subunit at the feedback end to convert the pressure information into a digital electrical signal;

[0060] S22, using the LCD screen 123 and the speaker 124 in the information output unit at the feedback end to convert the digital electrical signal into text and sound output respectively.

[0061] Through the above control method, when the researchers are grinding and polishing the metallographic sample 8, they can use the pressure sensor 6 on the fixture to output the pressure information of the metallographic sample 8 in the form of text and sound information feedback through the LCD screen 123 and the speaker 124, so that the researchers can know the pressure state of the metallographic sample 8 in real time, so as to apply a stable grinding and polishing pressure to the metallographic sample 8, thereby improving the quality and efficiency of preparing the metallographic sample 8.

[0062] In addition, the method includes:

[0063] S3. When no grinding and polishing pressure is applied to the metallographic sample 8, the pressure value of the feedback end is reset to zero by using the control subunit of the feedback end.

[0064] S4. When the grinding and polishing pressure has been applied to the metallographic sample 8, the pressure value of the feedback end is set as a reference pressure value by using the control subunit of the feedback end.

[0065] Specifically, Figure 2 As shown, the base 1 of the fixture is placed horizontally to press the metallographic sample 8 on the grinding and polishing platform, and by touching the button 125, the control subunit resets the pressure value output by the LCD screen 123 to zero.

[0066] Then in this state, the researchers apply a certain grinding and polishing pressure according to the material texture of different metallographic samples 8 and practical experience, and by touching the button 125, the control subunit sets the pressure value output by the LCD screen 123 as the reference pressure value.

[0067] Through the above steps, the fixture completes the correction and setting of the grinding and polishing pressure of the metallographic sample 8.

[0068] The control method further includes:

[0069] S5. During the grinding and polishing process of the metallographic sample 8, if the pressure value exceeds the reference pressure value range, the control subunit at the feedback end is used to control the output of reminder information to the information output unit for feedback.

[0070] Specifically, a threshold range of a reference pressure value is set. If the absolute value of the difference between the pressure value and the reference pressure value or the ratio of the pressure value to the reference pressure value exceeds the threshold range, the control subunit at the feedback end is used to control the output of warning prompt information to the speaker 124 and the output of text reminder information to the LCD display 123 to remind researchers of the change in force.

[0071] It can be understood that during the grinding and polishing process, the angled LCD screen 123 displays the corrected pressure value of the metallographic sample 8 in real time. Since the researchers holding the clamp cannot constantly and continuously apply the same empirical pressure, the sound of the speaker 124 and the text feedback of the LCD screen 123 are used to assist and remind the researchers to keep the applied force within a reasonable range of the reference pressure value, avoid drastic fluctuations in grinding and polishing pressure, and improve the quality and efficiency of preparing the metallographic sample 8.

[0072] Example 3

[0073] like Figure 4 As shown, based on the same inventive concept, an embodiment of the present invention further provides a grinding and polishing platform, including the fixture for preparing metallographic samples in Example 1, and the grinding and polishing platform also includes a grinding disc 91 located on the work surface, an auxiliary bracket 92, and a motor (not shown in the figure) for driving the grinding disc 91 to rotate. The auxiliary bracket 92 is fixedly mounted on the work surface and is located on one side of the grinding disc 91.

[0074] Specifically, Figure 2 and Figure 4 As shown, the auxiliary bracket 92 in the grinding and polishing platform of this embodiment has a horizontal cantilever with a plate-like structure, and a vertical guide hole (not shown in the figure) is provided on the horizontal cantilever. Among them, the guide column 72 on the handle 71 of the clamp is slidably matched with the guide hole so that the clamp as a whole slides up and down on the auxiliary bracket 92 through the guide column 72. The cross-sections of the guide column and the guide hole are both square structures to prevent the clamp from rotating horizontally on the auxiliary bracket 92.

[0075] With such an arrangement, during the polishing process of the metallographic sample 8, the researcher applies downward pressure by holding the clamp with the handle 71, and uses the auxiliary bracket 92 to slide with the guide column 72 on the handle 71 to control the direction of the force, so as to ensure the stability of the polished surface of the metallographic sample 8, alleviate the researcher's hand shaking and fatigue during the holding process, and improve the convenience of sample preparation and the efficiency of grinding and polishing.

[0076] In addition, if Figure 2 As shown, the second adjusting bolt 73 can be fine-tuned to make the entire fixture tilt at a certain angle relative to the auxiliary fixture, thereby adjusting the ground and polished surface of the metallographic sample 8 to meet the needs of researchers.

[0077] It should be noted that, according to actual applications, technicians in this field can choose a steel plate with strong rigidity as the auxiliary bracket 92 to prevent the auxiliary bracket 92 from being deformed by force. They can also choose a non-circular structure for the guide column and the guide hole to prevent the guide column from rotating in the guide hole.

[0078] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A fixture for preparing metallographic specimens, characterized in that: include: Base (1); At least two sets of clamping assemblies, the clamping assemblies being symmetrically mounted on the base (1) for clamping a metallographic sample (8); as well as A pressure feedback module, comprising a detection end and a feedback end electrically connected to each other, wherein the detection end and the feedback end are respectively mounted on two side surfaces of the base (1); When the metallographic sample (8) is clamped and fixed by the clamping assembly, the detection end of the pressure feedback module is against the back of the metallographic sample (8) to collect pressure information on the metallographic sample (8); the feedback end of the pressure feedback module is used to convert the pressure information into text and sound forms for output.

2. The fixture for preparing metallographic specimens according to claim 1, characterized in that: The base (1) comprises a substrate (12), an annular body (11) and a support column (121); the annular body (11) and the support column (121) are both fixed on the surface of one side of the substrate (12), the support column (121) is arranged on the central axis of the annular body (11), two sets of the clamping assemblies are symmetrically mounted on the annular body (11), the detection end of the pressure feedback module is mounted on the end of the support column (121), and the feedback end of the pressure feedback module is mounted on the surface of the other side of the substrate (12).

3. The fixture for preparing metallographic specimens according to claim 1, characterized in that: The feedback end includes a control subunit and an information output unit electrically connected to the control subunit, the control subunit converts the received pressure information into a digital electrical signal, and the information output unit converts the digital electrical signal into the text and the sound.

4. The fixture for preparing metallographic specimens according to claim 3, characterized in that: The information output unit comprises a liquid crystal display screen (123) and a speaker (124).

5. The fixture for preparing metallographic specimens according to claim 3, characterized in that: The detection end comprises a pressure sensor (6) electrically connected to the control subunit.

6. The fixture for preparing metallographic specimens according to claim 2, characterized in that: The clamping assembly comprises: A first adjusting bolt (3), which is arranged along the radial direction of the annular body (11) and is connected to the rotating shaft of the annular body (11); A sliding block (4) which is sleeved on the first adjusting bolt (3) and threadedly engaged with the first adjusting bolt (3); A limiting column (122), one end of which is fixed on the supporting column (121), the limiting column (122) is arranged in parallel with the first adjusting bolt (3), and the sliding block (4) is axially slidably connected with the limiting column (122); A clamping jaw (5) fixed on the sliding block (4), wherein the clamping jaw (5) is arranged toward the supporting column (121); When the first adjusting bolt (3) is adjusted to rotate, the first adjusting bolt (3) drives the slider (4) to move, and the slider (4) slides on the limiting column (122) to drive the clamping jaw (5) to clamp the sample.

7. The fixture for preparing metallographic specimens according to claim 6, characterized in that: The first adjusting bolt (3) comprises a bolt body and a nut (31), a convex ring (32) and an external thread which are sequentially formed on the bolt body; the nut (31) is located on the outer side of the annular body (11), and the convex ring (32) is located on the inner side of the annular body (11).

8. The fixture for preparing metallographic specimens according to claim 6, characterized in that: The number of the clamping assemblies is four sets, and the first adjusting bolts (3) in the four sets of the clamping assemblies are distributed in a "cross" shape along the annular body (11).

9. The fixture for preparing metallographic specimens according to claim 2, characterized in that: The clamp further comprises a protective member (2), wherein the protective member (2) is sleeved on the outer side wall of the support column (121).

10. The fixture for preparing metallographic specimens according to claim 2, characterized in that: The clamp further comprises a handle (71), both ends of which are mounted on the surface of the other side of the base plate (12); one end of the handle (71) is hinged to the base plate (12), and the other end of the handle (71) is screwed to the base plate (12) via a second adjusting bolt (73).

11. The fixture for preparing metallographic specimens according to claim 10, characterized in that: The handle (71) is provided with a guide column (72), the guide column (72) is located at one end where the handle (71) and the base plate (12) are hinged, and the guide column (72) is slidably connected to an auxiliary bracket (92) of the grinding and polishing platform.

12. A method for controlling a fixture for preparing a metallographic sample according to any one of claims 1 to 11, characterized in that: The control method comprises: When the metallographic sample (8) is clamped and fixed by the clamp; Using the detection end of the pressure feedback module to press against the back of the metallographic sample (8) to obtain pressure information on the metallographic sample (8); The pressure information is converted into text and sound forms and outputted by utilizing the feedback end of the pressure feedback module.

13. The control method for a fixture for preparing a metallographic sample according to claim 12, characterized in that: The step of converting the pressure information into text and sound format and outputting it using the feedback end of the pressure feedback module includes: The control subunit at the feedback end is used to convert the pressure information into a digital electrical signal; The digital electrical signal is converted into text and sound output respectively by using a liquid crystal display screen (123) and a loudspeaker (124) in the information output unit of the feedback end.

14. A grinding and polishing platform, characterized in that: The invention comprises a fixture for preparing a metallographic sample as claimed in any one of claims 1 to 11.

15. The grinding and polishing platform according to claim 14, characterized in that: The grinding and polishing platform comprises an auxiliary bracket (92), and the auxiliary bracket (92) is slidably connected to the handle (71) of the clamp.

16. The grinding and polishing platform according to claim 15, characterized in that: The auxiliary bracket (92) has a horizontal cantilever with a plate-like structure, a vertical guide hole is provided on the horizontal cantilever, and the guide column (72) on the handle (71) is slidably matched with the guide hole.

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