Sample preparation clamp and coating material transmission electron microscope section sample preparation device

Abstract

The invention discloses a sample preparation clamp and a coating material transmission electron microscope section sample preparation device, and relates to the technical field of experimental sample preparation equipment.The sample preparation clamp comprises a shell, two fixing sleeves, two coarse adjustment alignment assemblies, two fine adjustment clamping assemblies and a sample rod; the shell is provided with two first mounting grooves, a second mounting groove and a center hole; each fixed sleeve is mounted in the corresponding first mounting groove; each coarse adjustment alignment assembly is movably connected to the interior of the corresponding fixed sleeve, and the two coarse adjustment alignment assemblies are used for forming a centering channel after making contact with each other; each coarse adjustment alignment assembly is provided with a movable groove; each fine adjustment clamping assembly is movably connected to the interior of the corresponding movable groove and used for driving the two samples to enter the centering channel to achieve centering contact; and the sample rod is movably connected to the second mounting groove. According to the technical scheme provided by the invention, the sample is gradually moved and centered and clamped in the transverse direction, so that the sample is more stably clamped.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of experimental sample preparation equipment, in particular to a sample preparation clamp and a coating material transmission electron microscope cross-section sample preparation device. BACKGROUND

[0002] In the research of material surface engineering and coating technology, it is often necessary to analyze the transmission electron microscope of the adhered cross-section sample to observe the key information such as the microstructure of the material and the interface bonding state. The preparation quality of such samples directly affects the accuracy and reliability of the observation results. At present, the conventional transmission cross-section sample clamp is usually made of a special clamp, which usually includes an upper conical chuck and a lower support structure, and relies on a simple spring clamping device to realize the clamping function.

[0003] However, the existing clamp structure has obvious limitations. First, such a clamp lacks effective centering adjustment function, and it is difficult to achieve precise coaxial alignment between the conical chuck and the sample. The conical chuck itself is prone to uneven stress distribution due to its geometric shape, and if the clamping deviates from the center, the local concentration of stress at the adhesive cross-section will be further aggravated, significantly increasing the stress gradient in the edge area of the sample, which may cause sample damage or interface cracking.

[0004] Secondly, the existing clamping mechanism generally adopts a spring direct force application method. After the operator releases the clamping device, the upper conical chuck is quickly pressed down under the action of the spring restoring force and collides with the sample, generating a large amount of instantaneous impact energy. This impact force is extremely easy to cause irreversible mechanical damage to thin area samples and adhesive interfaces, such as film rupture, glue layer cracking or structural plastic deformation, which seriously affects the integrity of the final thinned sample and the electron transmission effect.

[0005] In summary, due to the shortcomings in the design of the existing transmission cross-section sample clamp, there are problems such as low centering accuracy, uneven stress distribution and large impact load during clamping, which seriously restricts the success rate of high-quality cross-section sample preparation, and hinders the fine characterization and technical development of key areas such as material surface modification layer and coating interface. SUMMARY

[0006] The main purpose of the present application is to provide a sample preparation clamp and a coating material transmission electron microscope cross-section sample preparation device, which aims to gradually move the sample from the horizontal direction to clamp it, avoiding the damage caused by the instantaneous impact of the previous clamp on the sample from the vertical direction, so that the clamp can clamp the sample more stably.

[0007] To achieve the above purpose, the sample preparation clamp provided by the present application comprises: a housing, the housing is provided with two first installation slots, a second installation slot communicated with the two first installation slots, and a center hole communicated with the second installation slot, the second installation slot is perpendicular to the two first installation slots; two fixed sleeves, each of the fixed sleeves is installed in one of the first installation slots; two coarse adjustment alignment assemblies, each of the coarse adjustment alignment assemblies is movably connected in one of the fixed sleeves, the two coarse adjustment alignment assemblies are used to contact each other to form a centering channel; each of the coarse adjustment alignment assemblies is provided with a movable slot; two fine adjustment clamping assemblies, each of the fine adjustment clamping assemblies is movably connected in one of the movable slots, the two fine adjustment clamping assemblies are used to drive two samples into the centering channel, so that the two samples are in contact and heated and solidified after being in contact; and a sample rod, the sample rod is movably connected to the second installation slot and movably extends into the centering channel, the sample rod is used to unload the two solidified samples from the fine adjustment clamping assemblies, and transport the two samples to extend out of the center hole for polishing and thinning of the two samples by a polishing machine.

[0008] In an embodiment, the coarse adjustment alignment assembly comprises: a coarse adjustment screw shaft body, the coarse adjustment screw shaft body is rotationally connected in the fixed sleeve; one end of the coarse adjustment screw shaft body is provided with a first handle, the first handle is limited outside the fixed sleeve; the coarse adjustment screw shaft body is provided with the movable slot extending along the axis thereof; and a coarse adjustment sleeve, the coarse adjustment sleeve is slidably connected in the fixed sleeve, and the coarse adjustment sleeve is provided with a first threaded hole, one end of the coarse adjustment screw shaft body away from the first handle is threadedly connected at the first threaded hole; one end of the coarse adjustment sleeve away from the first threaded hole is provided with a through hole coaxially arranged with the first threaded hole, the through hole, the first threaded hole and the movable slot are communicated in sequence; wherein, the coarse adjustment screw shaft body rotates in the fixed sleeve to drive the coarse adjustment sleeve to linearly slide in the fixed sleeve, so that the two coarse adjustment sleeves contact each other to form the centering channel through the two through holes.

[0009] In an embodiment, the fixed sleeve is provided with a first movable hole and a second movable hole communicated with the first movable hole, one end of the coarse adjustment screw shaft body away from the first handle is rotationally connected at the first movable hole; the first movable hole has a cylindrical cross-sectional shape, the second movable hole has a non-cylindrical cross-sectional shape, and the coarse adjustment sleeve has a non-cylindrical cross-sectional profile, the coarse adjustment sleeve is slidably connected in the second movable hole.

[0010] In an embodiment, the fine adjustment clamping assembly comprises: a pressing screw shaft body, which is threadedly connected in the movable groove, one end of the pressing screw shaft body being provided with a second handle outside the movable groove, and the other end of the pressing screw shaft body being provided with a mounting hole; and a motion control lever body, one end of the motion control lever body being rotatably connected to the mounting hole, and the other end of the motion control lever body being a square lever body; the through hole is a square hole, and the end of the motion control lever body away from the second handle is movably arranged in the through hole; wherein the pressing screw shaft body rotates in the movable groove to drive the motion control lever body to bring the two samples close to contact in the center passage.

[0011] In an embodiment, the coarse adjustment sleeve and the motion control lever body are both provided with resistance wires, which are used to heat the temperature of the coarse adjustment sleeve and the motion control lever body to solidify the samples.

[0012] In an embodiment, the shell is further provided with an access hole in communication with the second mounting groove; The sample rod comprises: a lever body shell, which extends into the second mounting groove from the access hole and is slidably connected in the second mounting groove, the lever body shell having a moving groove; a knob, which is rotatably connected to the outside of one end of the lever body shell adjacent to the access hole, and the knob is located outside the moving groove; a vertical lever body, one end of the vertical lever body being rotatably connected in the knob and slidably connected to the moving groove, and the other end of the vertical lever body being provided with a driving component; and two sample rod clamping pieces, each of which is connected with the driving component, and the driving component is used to drive the two sample rod clamping pieces to clamp the two solidified samples; wherein the knob is rotated to drive the vertical lever body to rise relative to the lever body shell, so that the driving component drives the two sample rod clamping pieces to approach each other to clamp the two solidified samples.

[0013] In an embodiment, the two side surfaces of the driving component are two first wedge surfaces; The sample rod clamping piece comprises two assemblies and two clamping pieces, one end of each of the assemblies is connected with one of the clamping pieces, and one side surface of each of the assemblies is a second wedge surface, each of the first wedge surfaces is connected with one of the second wedge surfaces in a key groove matching manner; wherein the vertical lever body drives the driving component to rise, so that the driving component drives the two clamping pieces to approach each other to clamp the two solidified samples.

[0014] In an embodiment, the slot wall of the moving slot is provided with at least one guide protrusion. The other side of the two assemblies is provided with a guide slot extending in the horizontal direction; the guide protrusion is slidingly connected to the guide slot to enable the two assemblies to move in the horizontal direction.

[0015] In an embodiment, the sample preparation clamp further comprises two vertical guide rails provided on the slot wall of the second mounting slot, the two vertical guide rails extending in the vertical direction of the second mounting slot and being arranged in a spaced manner. The sample rod further comprises two sliding blocks connected to the outer wall of the rod body shell and located on both sides of the rod body shell; each sliding block is slidingly connected to one of the vertical guide rails.

[0016] In an embodiment, the knob is provided with a stepped hole and a second threaded hole in communication with the stepped hole. One end of the rod body shell is threadedly connected at the second threaded hole, and the vertical rod body is provided with a limiting end cover at the end away from the driving component, the limiting end cover being rotationally connected to the stepped hole, so that the knob only drives the rod body shell to ascend and descend.

[0017] The present application further provides a coating material transmission electron microscope cross-section sample preparation device, which comprises: a device shell having an inner cavity; a grinding and polishing machine installed in the inner cavity; and a sample preparation clamp as described above, which is installed in the inner cavity and located above the grinding and polishing machine.

[0018] The sample preparation clamp of the technical scheme of the present application comprises an outer shell with two first mounting grooves, a second mounting groove and a central hole, two fixed sleeves are respectively mounted in the first mounting grooves, each fixed sleeve movably connects a coarse adjustment alignment assembly, the two coarse adjustment alignment assemblies form a centering channel by being close to each other, and each coarse adjustment alignment assembly is provided with a movable groove, each movable groove movably connects a fine adjustment clamping assembly, which is used for driving two samples into the centering channel in the transverse direction to realize accurate centering contact and heating curing, and finally the sample rod moves in the second mounting groove, extends into the centering channel to unload the cured sample and sends it out from the central hole for subsequent polishing and thinning treatment. By setting the two coarse adjustment alignment assemblies to be close to each other in the fixed sleeves to form the centering channel, and the two fine adjustment clamping assemblies to drive the samples to move into the centering channel in the transverse direction step by step in the movable grooves, the centering contact and heating curing are realized, so that the structural damage caused by the instantaneous impact of the traditional clamp on the sample in the vertical direction is avoided, the controllable and gradual centering and clamping force provided by the transverse movement reduces the instantaneous impact, the sample is more stable during clamping and is not easy to shift or break, and finally the accuracy and reliability of sample preparation are improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings shown.

[0020] Figure 1 A perspective view of the sample preparation clamp provided by the present application; Figure 2 A perspective view of the sample preparation clamp provided by the present application in a half-section state; Figure 3 A longitudinal sectional view of the sample preparation clamp provided by the present application in a state of clamping a sample; Figure 4 A longitudinal sectional view of the sample preparation clamp provided by the present application in a state of clamping a sample; Figure 3 A longitudinal sectional view of the sample preparation clamp provided by the present application in a state of clamping a sample; Figure 5 A longitudinal sectional view of the sample preparation clamp provided by the present application in an initial state; Figure 6 A longitudinal sectional view of the sample preparation clamp provided by the present application in an initial state from another perspective; Figure 7 A longitudinal sectional view of the sample preparation clamp provided by the present application in an initial state from another perspective; Figure 8A perspective view of a sample rod of the sample preparation clamp provided by the present application in a half-section state; Figure 9 A perspective view of a sample rod of the sample preparation clamp provided by the present application; Figure 10 A lateral section view of a driving component of the sample rod of the sample preparation clamp provided by the present application; Figure 11 A perspective view of a coarse adjustment screw shaft body of the sample preparation clamp provided by the present application; Figure 12 A perspective view of a coarse adjustment sleeve of the sample preparation clamp provided by the present application; Figure 13 A perspective view of a pressure applying screw shaft body and a motion control lever body of the sample preparation clamp provided by the present application.

[0021] Brief Description of the Drawings 10, housing; 10a, first mounting groove; 10b, second mounting groove; 10c, center hole; 10d, access hole; 20, fixed sleeve; 20a, first movable hole; 20b, second movable hole; 30, coarse adjustment alignment assembly; 30a, movable groove; 31, coarse adjustment screw shaft body; 31a, first handle; 32, coarse adjustment sleeve; 32a, first threaded hole; 32b, via hole; 40, fine adjustment clamping assembly; 41, pressure applying screw shaft body; 41a, second handle; 41b, mounting hole; 42, motion control lever body; 50, sample rod; 51, rod body housing; 51a, moving groove; 51b, guide protrusion; 52, knob; 52a, stepped hole; 52b, second threaded hole; 53, vertical rod body; 531, driving component; 531a, first wedge surface; 532, limit end cap; 54, sample rod clamping piece; 541, assembly body; 541a, second wedge surface; 541b, guide groove; 542, clamping piece; 55, sliding block; 60, vertical guide rail; 1, sample.

[0022] The objectives, functional characteristics and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be apparently and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0024] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, motion condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0025] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0026] In the prior art, material surface engineering and coating technology research often needs to analyze the cross-section sample after sticking by transmission electron microscope, but the existing clamp has the problems of insufficient centering accuracy, uneven stress distribution and large impact load. The conventional clamp adopts a conical chuck and a spring clamping structure, and the centering phenomenon is easy to occur during clamping, which leads to local stress concentration, and the impact force generated by the spring release is easy to damage the sample interface structure, affecting the observation accuracy.

[0027] In order to solve the above problems, it is necessary to develop a clamp which can realize precise centering adjustment, reduce mechanical impact and optimize stress distribution. Considering that the existing clamp lacks a phased adjustment function, a clamping method combining coarse adjustment and fine adjustment is proposed during design, and sample positioning and clamping are realized step by step through mechanical structure. In view of the impact load problem, a movable sample rod is introduced to realize smooth transfer of the sample, avoiding direct impact. In addition, a heating and curing function is integrated during clamping to ensure the stability of the sample combination.

[0028] Therefore, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 7The application provides a sample preparation clamp, which comprises a shell 10, a fixing sleeve 20, a coarse adjustment alignment assembly 30, a fine adjustment clamping assembly 40 and a sample rod 50. The shell 10 is provided with a first mounting groove 10a, a second mounting groove 10b and a central hole 10c which are communicated with each other, the fixing sleeve 20 is mounted in the first mounting groove 10a, the coarse adjustment alignment assembly 30 is movably connected to the fixing sleeve 20 and forms a centering channel, the fine adjustment clamping assembly 40 drives the sample 1 to be centered and contacted and heated and solidified in the movable groove 30a, and the sample rod 50 moves through the second mounting groove 10b to unload the solidified sample 1 and is transported to a polishing and grinding machine.

[0029] In the embodiment, the first mounting groove 10a of the shell 10 is used for mounting the fixing sleeve 20, the second mounting groove 10b and the central hole 10c form a sample transport path, and the vertical layout can optimize the space utilization. The fixing sleeve 20 is used as a support structure of the coarse adjustment assembly and can be made of stainless steel to enhance the rigidity. The movable groove 30a of the coarse adjustment alignment assembly 30 cooperates with the centering channel, and the preliminary centering is realized by mechanical sliding. The movable connection design of the fine adjustment clamping assembly 40 allows micron-level displacement control. The sliding connection mode of the sample rod 50 can reduce the motion resistance.

[0030] Specifically, after the fixing sleeve 20 is embedded in the first mounting groove 10a of the shell 10, the coarse adjustment alignment assembly 30 moves in the fixing sleeve 20 through screw transmission, so that the end portions of the two coarse adjustment alignment assemblies 30 contact to form a centering channel. The fine adjustment clamping assembly 40 rotates and advances in the movable groove 30a and drives the two samples 1 to be centered in the centering channel and accurately close along the axis until contact. The sample rod 50 extends into the centering channel from the second mounting groove 10b, the solidified sample 1 is stably withdrawn from the centering channel, and finally the solidified sample 1 is output from the central hole 10c, so that the sample 1 is sent to the outside for a polishing process.

[0031] Compared with the prior art, the present application realizes the coarse adjustment and fine adjustment in stages, significantly improves the centering accuracy and avoids the deviation problem caused by single clamping. The translation transport mechanism of the sample rod 50 replaces the traditional spring release mode, eliminating the damage risk of impact load to the sample 1. The sample preparation clamp can accurately position, gradually force and uniformly force the two samples 1 which need to be bonded, and ensure the bonding stability and accurate positioning of the two samples 1. All components of the sample preparation clamp are made of high-temperature alloy materials to enhance the strength, rigidity and durability of the sample preparation clamp under heating conditions, thereby improving the reliability of the sample preparation clamp in the clamping process.

[0032] Please refer to Figure 1 , Figure 2 and Figure 7The present scheme realizes the gradual movement and accurate centering of the sample 1 in the transverse direction by setting the shell 10 with the first mounting groove 10a, the second mounting groove 10b and the center hole 10c, and cooperating with the synergistic action of the two fixing sleeves 20, the coarse adjustment alignment assembly 30, the fine adjustment clamping assembly 40 and the sample rod 50, and completely avoids the damage to the sample 1 caused by the traditional vertical instantaneous impact mode; the two-stage adjustment mechanism (coarse adjustment forms a centering channel, and fine adjustment performs micro-motion clamping) combined with the heating and curing and the automatic transfer function of the sample rod 50 significantly improves the clamping stability, operation precision and sample preparation efficiency, and finally provides reliable protection for the lossless and high-quality preparation of the transmission electron microscope cross-section sample of the coating material.

[0033] The present application further proposes a sample preparation clamp, which comprises a shell 10, a fixing sleeve 20, a coarse adjustment alignment assembly 30, a fine adjustment clamping assembly 40 and a sample rod 50. The coarse adjustment alignment assembly 30 comprises a coarse adjustment screw shaft body 31 and a coarse adjustment sleeve 32, one end of the coarse adjustment screw shaft body 31 is provided with a first handle 31a and is rotationally connected in the fixing sleeve 20, and the other end is threadedly connected at a first threaded hole 32a of the coarse adjustment sleeve 32; the coarse adjustment sleeve 32 is slidingly connected in the fixing sleeve 20, and the coarse adjustment sleeve 32 is provided with a through hole 32b coaxially arranged with the first threaded hole 32a; the linear sliding of the coarse adjustment sleeve 32 is driven by rotating the coarse adjustment screw shaft body 31, so that the two coarse adjustment sleeves 32 are in contact to form a centering channel.

[0034] In the embodiment, the coarse adjustment screw shaft body 31 refers to a cylindrical structure with a spiral groove, which can be realized by processing a rod body with external threads from stainless steel material, and the movable groove 30a arranged in the axial extension direction of the shaft is used to accommodate the fine adjustment clamping assembly 40. The first handle 31a refers to an operating part arranged at the outer end of the screw shaft body, which can be realized by a metal disc structure with anti-slip patterns, and the operator can control the rotation stroke of the coarse adjustment screw shaft body 31 by limiting the position of the first handle 31a outside the fixing sleeve 20. The coarse adjustment sleeve 32 refers to a metal sleeve with a first threaded hole 32a arranged inside, which can be made of high-hardness alloy material, and the through hole 32b is coaxially arranged with the first threaded hole 32a to guide the movement path of the sample 1.

[0035] Specifically, when the positions of the two coarse adjustment sleeves 32 need to be adjusted, the operator rotates the first handle 31a to drive the coarse adjustment screw shaft body 31 to rotate. Since the coarse adjustment sleeve 32 is threadedly connected with the coarse adjustment screw shaft body 31 through the first threaded hole 32a, the rotational movement of the coarse adjustment screw shaft body 31 is converted into the linear displacement of the coarse adjustment sleeve 32 in the fixing sleeve 20. When the end portions of the two coarse adjustment sleeves 32 are in contact, the two through holes 32b are connected to form a continuous centering channel, and the two samples 1 can maintain an accurate coaxial state in the centering channel.

[0036] Compared with the prior art, the traditional clamp relies on the cooperation of the conical chuck and the spring to realize clamping, and lacks axial position adjustment function. The scheme realizes manual precise adjustment in the coarse adjustment stage through the cooperation of the coarse adjustment screw shaft body 31 transmission and the rectangular coarse adjustment sleeve 32. The transmission mode of the threaded pair of the coarse adjustment screw shaft body 31 and the coarse adjustment sleeve 32 eliminates the instantaneous impact caused by the spring force, and the sliding cooperation of the rectangular coarse adjustment sleeve 32 and the fixed sleeve 20 avoids the deflection error, and the centering channel formed by the through hole 32b makes the sample 1 complete the axis calibration before contact. Through the above technical scheme, the present application solves the problem of stress concentration caused by low centering accuracy of the existing clamp. The threaded cooperation of the coarse adjustment screw shaft body 31 and the coarse adjustment sleeve 32 realizes the position adjustment of millimeter level accuracy.

[0037] Please refer to Figures 2 to 4 , the present application further puts forward that the fixed sleeve 20 is provided with a first movable hole 20a and a second movable hole 20b in communication with the first movable hole 20a, and the end of the coarse adjustment screw shaft body 31 away from the first handle 31a is rotationally connected at the first movable hole 20a; the cross-sectional shape of the first movable hole 20a is cylindrical, and the cross-sectional shape of the second movable hole 20b and the contour shape of the cross section of the coarse adjustment sleeve 32 are both non-cylindrical, and the coarse adjustment sleeve 32 is slidingly connected at the second movable hole 20b.

[0038] In the embodiment, the end of the coarse adjustment screw shaft body 31 away from the first handle 31a rotates in the cylindrical first movable hole 20a, which does not affect the operation of the operator; and the end of the coarse adjustment sleeve 32 provided with the first threaded hole 32a slides at the second movable hole 20b of the fixed sleeve 20, and the coarse adjustment screw shaft body 31 is threadedly connected at the first threaded hole 32a of the coarse adjustment sleeve 32, realizing threaded transmission with the coarse adjustment sleeve 32. In this way, when the coarse adjustment screw shaft body 31 rotates at the first movable hole 20a, it will not drive the non-cylindrical coarse adjustment sleeve 32 to rotate at the second movable hole 20b, but only drive the coarse adjustment sleeve 32 to move linearly at the second movable hole 20b. The rectangular outer contour of the two coarse adjustment sleeves 32 forms a sliding fit with the inner wall of the fixed sleeve 20, ensuring that no deflection occurs during movement.

[0039] The end of the coarse adjustment screw shaft body 31 away from the first handle 31a is gap-fitted with the hole wall of the first movable hole 20a of the fixed sleeve 20, so as to avoid the rotation of the coarse adjustment screw shaft body 31 being interfered, and ensure accurate positioning before complete clamping. The coarse adjustment sleeve 32 is gap-fitted with the fixed sleeve 20, so as to avoid the movement of the coarse adjustment sleeve 32 in the X-axis direction being interfered, and ensure the stability of the final clamping.

[0040] The housing 10 comprises a shell, an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are respectively detachably connected to the upper end surface and the lower end surface of the shell, the shell is provided with first mounting grooves 10a distributed on the left and right sides thereof, the upper cover plate is provided with an access hole 10d, the lower cover plate is provided with a central hole 10c, and the upper cover plate, the shell and the lower cover plate enclose to form a second mounting groove 10b, the second mounting groove 10b communicates with the two first mounting grooves 10a, the access hole 10d and the central hole 10c.

[0041] The sample rod 50 is in clearance fit with the upper cover plate to avoid the movement of the sample rod 50 in the Y-axis direction being interfered, and to ensure the stability of the preliminary clamping. The sample rod 50 is in clearance fit with the lower cover plate to avoid the movement of the sample rod 50 in the Y-axis direction being interfered, and to ensure the stability of the preliminary clamping.

[0042] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 13 , the application further proposes a fine adjustment clamping assembly 40 comprising a pressing screw shaft body 41 and a motion control rod body 42. The pressing screw shaft body 41 is threadedly connected in the movable groove 30a, one end of which is provided with a second handle 41a and located outside the movable groove 30a, and the other end is provided with a mounting hole 41b. One end of the motion control rod body 42 is rotationally connected to the mounting hole 41b, and the other end of the motion control rod body 42 is a square rod body and movably passes through the via hole 32b. The pressing screw shaft body 41 rotates in the movable groove 30a to drive the motion control rod body 42 to drive the two samples 1 to approach and contact in the centering channel.

[0043] In the embodiment, the pressing screw shaft body 41 refers to an axial body with a threaded structure, which can be specifically formed by machining an external thread of a metal material and matched with an internal thread of the movable groove 30a, and the rotational motion is converted into linear displacement. The threaded structure of the pressing screw shaft body 41 enables the operator to realize micron-level displacement adjustment by rotating the second handle 41a, avoiding the impact caused by the spring force. The motion control rod body 42 refers to a rod-shaped component with a square end, which can be specifically matched with the square via hole 32b in clearance to ensure that it only translates in the axial direction during the motion without rotating deviation. The square rod body of the motion control rod body 42 and the via hole 32b can limit the freedom of motion to prevent the sample 1 from being angularly deflected during clamping.

[0044] Specifically, when the operator rotates the second handle 41a, the pressing screw shaft 41 generates axial displacement under the action of the threaded pair, pushing the motion control rod 42 to move along the active groove 30a. Since the square end of the motion control rod 42 is in sliding fit with the square through hole 32b of the coarse adjustment sleeve 32, its motion trajectory is strictly limited to straight-line advancement. When the motion control rods 42 of the two fine adjustment clamping assemblies 40 move synchronously towards each other, the clamping pressure of the clamped sample 1 can be accurately controlled, ensuring that the contact surfaces of the sample 1 are parallel and fit together. The self-locking property of the threaded transmission in this process can maintain stable clamping force and prevent displacement of the sample 1 during the curing stage.

[0045] Compared with the prior art, when the conventional clamp directly clamps with a spring, the clamping force is difficult to accurately control and there is instantaneous impact. The present scheme converts rotary motion into controllable straight-line advancement through the combination of the threaded transmission of the pressing screw shaft 41 and the square end of the motion control rod 42, eliminating the impact energy when the spring is released. The cooperation of the square end of the motion control rod 42 and the through hole 32b further restricts the motion direction, ensuring that the sample 1 does not deviate in angle during contact, thereby improving the centering accuracy.

[0046] Please refer to Figure 4 The present application further proposes that the coarse adjustment sleeve 32 and the motion control rod 42 are both installed with resistance wires, which are used to heat the temperature of the coarse adjustment sleeve 32 and the motion control rod 42 to cure the sample 1.

[0047] In the present embodiment, the resistance wire refers to a conductive heating element wrapped around the outer wall surface of the coarse adjustment sleeve 32 and embedded in the interior of the motion control rod 42, which can be realized in a spiral winding manner with nickel-chromium alloy wire, and the temperature is adjusted through a wire connection to an external power supply controller. Temperature control refers to achieving gradient heating by changing the input current intensity, which can be realized by a PID temperature controller.

[0048] Specifically, after the two samples 1 complete contact positioning in the centering channel, the operator starts the resistance wire heating program. The annular resistance wire of the outer wall of the coarse adjustment sleeve 32 uniformly heats the bonding area of the sample 1 in the circumferential direction, while the axial arrangement of the resistance wire inside the motion control rod 42 implements directional heat conduction to the contact surface of the sample 1. As the temperature rises, the thermosetting adhesive pre-coated on the interface of the sample 1 undergoes crosslinking reaction, completing the curing process while maintaining the centering accuracy. After heating is completed, the contact interface of the two samples 1 forms a stable chemical bond, avoiding displacement or cracking due to mechanical vibration during subsequent polishing.

[0049] Compared with the prior art, the conventional clamp relies on natural curing or external oven heating, and has the problems of long curing time and uneven heating leading to shrinkage deformation of the glue layer. The scheme integrates a resistance wire heating structure to directly complete in-situ curing of the two samples 1 inside the two fine-tuning clamping assemblies 40, eliminates the risk of centering deviation caused by transfer processes, and shortens the process cycle.

[0050] Through the above technical scheme, the present application realizes the synchronous completion of the sample 1 bonding and curing process, effectively avoids interface cracking caused by glue layer shrinkage stress, and ensures that the centering accuracy is maintained during the curing process. The heating process is spatially coupled with the clamping mechanism, and the heat is directly conducted to the bonding interface, which improves the curing efficiency while reducing energy loss.

[0051] Please refer to Figures 3 to 7 , the present application further provides that the shell 10 is also provided with an access hole 10d communicating with the second mounting groove 10b, and the sample rod 50 includes a rod body shell 51, a vertical rod body 53, and two sample rod clamping pieces 54. The rod body shell 51 extends into the second mounting groove 10b from the access hole 10d and is slidingly connected in the second mounting groove 10b, and the rod body shell 51 has a moving groove 51a. The knob 52 is rotationally connected to the outside of one end of the rod body shell 51 adjacent to the access hole 10d, and the knob 52 is located outside the moving groove 51a; one end of the vertical rod body 53 is rotationally connected to the inside of the knob 52 and slidingly connected to the moving groove 51a, and the other end of the vertical rod body 53 is provided with a driving component 531; the two sample rod clamping pieces 54 are connected with the driving component 531 respectively, and the driving component 531 is used for driving the two sample rod clamping pieces 54 to clamp the two cured samples 1; wherein the knob 52 is rotated to drive the vertical rod body 53 to rise relative to the rod body shell 51, so that the driving component 531 drives the two sample rod clamping pieces 54 to approach each other to clamp the two cured samples 1.

[0052] In the present embodiment, the rod body shell 51 refers to a shell structure with a moving groove 51a, which can specifically be a rectangular or cylindrical shell formed by processing a metal material, and the moving groove 51a is used to accommodate the vertical rod body 53 and limit the movement direction thereof. The vertical rod body 53 is a rod-shaped component rotationally connected to the internal space of the knob 52 at one end and slidingly connected in the moving groove 51a, and the one end of the rod body shell 51 adjacent to the access hole 10d can specifically adopt a threaded structure to cooperate with the internal space of the knob 52 to realize lifting movement. The driving component 531 refers to a mechanical structure used for transmitting motion and driving the sample rod clamping pieces 54 to close.

[0053] The knob 52 drives itself to rotate relative to the rod shell 51 through a threaded structure, and is lifted along the axial direction of the rod shell 51 in the process of rotation; since one end of the vertical rod body 53 is rotationally connected with the knob 52, the vertical rod body 53 will not rotate with the knob 52 in the process of rotation of the knob 52, but will be lifted relative to the vertical rod body 53 along with the rotating action of the knob 52, so that the lifted vertical rod body 53 drives the two sample rod clamping pieces 54 to move close to or away from each other, i.e. changes the distance between the two sample rod clamping pieces 54, realizes clamping or loosening the two samples 1 after solidification.

[0054] Through the above technical solutions, the present application realizes smooth transmission and accurate control of force in the process of clamping the sample 1, effectively reduces the damage risk of the adhesive interface caused by impact load. The cooperative action of the knob 52, the rod shell 51 and the vertical rod body 53 ensures the stability of the closed track of the sample rod clamping piece 54, and avoids the stress concentration phenomenon caused by clamping deviation. The overall slidable design of the sample rod 50 expands the application range of the device, and can adapt to the preparation requirements of samples 1 of different thicknesses and shapes.

[0055] Please refer to Figures 7 to 10 The present application further proposes that the two side surfaces of the driving component 531 are two first wedge surfaces 531a; the sample rod clamping piece 54 comprises two assembly bodies 541 and two clamping pieces 542, one end of each assembly body 541 is connected with one clamping piece 542, and one side surface of each assembly body 541 is a second wedge surface 541a, each first wedge surface 531a is connected with one second wedge surface 541a through key groove fitting, the vertical rod body 53 drives the driving component 531 to rise so that the driving component 531 drives the two clamping pieces 542 to move close to each other to clamp the two samples 1 after solidification, at least one guide protrusion 51b is arranged on the groove wall of the moving groove 51a, the other side surface of each assembly body 541 is provided with a guide groove 541b, the guide groove 541b is arranged in the horizontal direction, and the guide protrusion 51b is slidingly connected with the guide groove 541b so that the two assembly bodies 541 move in the horizontal direction.

[0056] In this embodiment, the driving component 531 refers to a convex structure with two first wedge surfaces 531a (inclined contact surfaces), which can be implemented by a metal block with a trapezoidal cross section. The first wedge surface 531a contacts the second wedge surface 541a of the assembly body 541 to generate a horizontal directional component to push the clamping piece 542. The assembly body 541 refers to a transition component connecting the clamping piece 542 and the driving component 531, which can be implemented by a metal connecting rod with a second wedge surface 541a or a triangular metal block with a second wedge surface 541a. The second wedge surface 541a of the assembly body 541 forms a sliding fit with the first wedge surface 531a of the driving component 531. The clamping piece 542 refers to a clamping component directly contacting the sample 1, which can be implemented by a metal sheet with anti-slip patterns on the surface. The keyway fit connection refers to a sliding guide fit between the first wedge surface 531a and the second wedge surface 541a, which can be implemented by a plurality of mortise structures and a plurality of tenon structures arranged at intervals for one-to-one corresponding clamping fit. The guide protrusion 51b refers to a boss structure limiting the movement direction of the assembly body 541, which can be implemented by a metal strip welded on the wall of the moving groove 51a. The guide groove 541b refers to a linear sliding groove cooperating with the guide protrusion 51b, which can be implemented by a rectangular recess formed by machining, and the straight-line movement of the assembly body 541 is ensured by sliding constraint.

[0057] Specifically, during operation, the knob 52 rotates to drive the vertical rod body 53 to rise in the moving groove 51a, and the driving component 531 moves upward accordingly. Since the second wedge surface 541a of the assembly body 541 forms an inclined surface fit with the first wedge surface 531a of the driving component 531, the vertical movement is converted into a horizontal clamping force. As the driving component 531 continues to rise, the two clamping pieces 542 gradually approach until the two samples 1 are clamped firmly. The sliding of the guide protrusion 51b in the guide groove 541b restricts the movement trajectory of the clamping piece 542, preventing deflection or jamming. The sliding fit of the rod body shell 51 in the second mounting groove 10b can adjust the overall position of the sample rod 50, facilitating the accurate feeding of the clamped sample 1 into the polishing and grinding station.

[0058] Compared with the prior art, the traditional spring clamping device directly applies force in the vertical direction, which is easy to produce impact load. However, the present scheme converts the rotary motion into horizontal clamping force through the fit of the first wedge surface 531a of the driving component 531 and the second wedge surface 541a of the assembly body 541, achieving gradual pressure application. Moreover, the present scheme ensures that the clamping piece 542 always maintains coaxial centering motion through the fit of the guide protrusion 51b and the guide groove 541b, avoiding damage to the sample 1 caused by one-sided stress and eliminating the instantaneous impact problem of the traditional spring clamping device.

[0059] Please refer to Figures 7 to 10The slot wall of the moving slot 51a is provided with at least one guide protrusion 51b; the other side of the two assembly bodies 541 is provided with a guide slot 541b extending in the horizontal direction; the guide protrusion 51b is slidingly connected to the guide slot 541b, so that the two assembly bodies 541 move in the horizontal direction.

[0060] In the embodiment, the guide protrusion 51b refers to a strip-shaped or block-shaped protrusion structure fixed to the inner wall of the moving slot 51a, which can be realized by welding or one-piece forming of a metal strip with a trapezoidal cross section or a semicircular cross section, and is used to limit the vertical deviation of the assembly body 541 during movement. The guide slot 541b refers to a long strip-shaped groove opened in the side of the assembly body 541, which can be formed by wire cutting to match the shape of the guide protrusion 51b, and is used to form a sliding pair with the guide protrusion 51b to ensure that the assembly body 541 can only move horizontally. The cooperation between the guide protrusion 51b and the guide slot 541b eliminates the freedom of movement of the assembly body 541 by mechanical constraint, and ensures that the clamp piece 542 maintains a strictly horizontal movement trajectory during clamping of the sample 1.

[0061] Specifically, when the sample rod clamp piece 54 performs a clamping action, the wedge-shaped protruding part pushes the two assembly bodies 541 to move towards each other. At this time, the guide protrusion 51b is embedded in the guide slot 541b to form sliding contact, and the assembly body 541 is forced in the wedge-shaped surface while its movement direction is strictly limited on the horizontal axis by the cooperation between the guide slot 541b and the guide protrusion 51b. This design can avoid the inclination or torsion of the assembly body 541 due to uneven force, and ensure that the clamp piece 542 always moves smoothly along the predetermined path. When the knob 52 drives the vertical rod body 53 to rise, the interaction force between the wedge-shaped protruding part and the wedge-shaped surface is decomposed into a horizontal component, and the sliding cooperation between the guide slot 541b and the guide protrusion 51b converts all the horizontal components into the linear clamping action of the clamp piece 542, effectively eliminating the lateral displacement error.

[0062] The application forms a forced horizontal movement constraint during clamping by setting the sliding cooperation between the guide protrusion 51b and the guide slot 541b, overcomes the movement deviation problem of the traditional spring clamping device due to the lack of guidance, and significantly improves the linearity and stability of the clamping action.

[0063] Please refer to Figure 4 、 Figures 7 to 10 The sample preparation clamp further comprises two vertical guide rails 60 provided on the slot wall of the second mounting slot 10b, the two vertical guide rails 60 extend in the vertical direction of the second mounting slot 10b and are arranged in a spaced manner; the sample rod 50 further comprises two sliding blocks 55 connected to the outer wall of the rod body shell 51 and located on both sides of the rod body shell 51; each sliding block 55 is slidingly connected to a vertical guide rail 60.

[0064] In the embodiment, the vertical guide rail 60 refers to a linear guide structure fixed on the groove wall of the second mounting groove 10b, which can be implemented by a T-shaped groove or a dovetail groove structure, and the extending direction is parallel to the vertical axis of the second mounting groove 10b. The vertical guide rail 60 is used to constrain the movement trajectory of the rod body shell 51, preventing it from deviating in the horizontal direction. The slider 55 refers to a sliding component rigidly connected with the rod body shell 51, which can be implemented by a sliding block with a matching guide rail section. The cooperation of the slider 55 and the vertical guide rail 60 can be converted into the pure linear motion of the rod body shell 51 in the vertical direction, avoiding the deviation of the movement path caused by external interference.

[0065] Specifically, when the operator drives the rod body shell 51 to move in the second mounting groove 10b, the two sliders 55 slide in the corresponding vertical guide rails 60 respectively. Due to the interval arrangement design of the two vertical guide rails 60, the rod body shell 51 is symmetrically constrained during movement, and the movement axis always coincides with the vertical center line of the second mounting groove 10b. This double-rail guiding mechanism can eliminate the rotational freedom of the rod body shell 51 in the horizontal plane, ensuring that the movement direction of the driving component 531 is strictly vertical when clamping the sample 1, and avoiding the position deviation of the sample 1 caused by the inclination of the clamping force direction.

[0066] In some specific embodiments, the surface of the vertical guide rail 60 can be provided with a low-friction material coating, such as a polytetrafluoroethylene layer, to reduce the sliding resistance. The slider 55 can be made of aluminum alloy, with a graphite self-lubricating bushing embedded inside, to ensure smooth movement during long-term use.

[0067] Please refer to Figure 4 、 Figures 7 to 13 , the present scheme forms a double-restraint mechanism by cooperating the two vertical guide rails 60 with the corresponding sliders 55 respectively, so that the movement trajectory of the rod body shell 51 is strictly limited in the vertical plane. This rigid guide structure not only improves the repeatability of the clamping action, but also avoids the centering failure of the sample 1 caused by the deviation of the movement path.

[0068] The application further proposes that the knob 52 is provided with a stepped hole 52a and a second threaded hole 52b communicating with the stepped hole 52a; one end of the rod body shell 51 is threadedly connected at the second threaded hole 52b, and the end of the vertical rod body 53 away from the driving component 531 is provided with a limiting end cover 532, which is rotationally connected at the stepped hole 52a, so that the knob 52 only drives the rod body shell 51 to rise and fall.

[0069] In this embodiment, the stepped hole 52a refers to a through hole with a stepped inner diameter, which can be formed by arranging multiple cylindrical holes with different diameters coaxially, and is used to accommodate the limiting end cover 532 and limit its axial displacement. The second threaded hole 52b refers to a threaded structure arranged coaxially with the stepped hole 52a, which can be realized by standard threading process, and is used to form a threaded connection with the vertical rod body 53. The limiting end cover 532 refers to a disc-shaped structure installed at the end of the vertical rod body 53, which can be realized by a bearing or bush structure, so that it is rotationally connected in the stepped hole 52a, avoiding axial displacement of the vertical rod body 53 during rotation of the knob 52. The second threaded hole 52b of the knob 52 has internal threads, which are engaged with the external threads of the rod body shell 51; the stepped hole 52a of the knob 52 is in clearance fit with the limiting end cover 532, so that the rotation and movement of the sample rod 50 only causes the linear movement of the vertical rod body 53. The rotation and movement of the knob 52 causes the movement of the sample rod clamp 54 in the X-axis direction, i.e. clamping two samples 1, and then moving the overall sample rod 50 to move the sample 1 out of the clamp, thereby achieving the polishing and thinning of the post-bonded sample 1.

[0070] Specifically, when the knob 52 is rotated, the second threaded hole 52b in the knob 52 is in threaded fit with the rod body shell 51 to produce axial displacement, and the knob 52 is lifted or lowered along the second mounting groove 10b relative to the rod body shell 51. The limiting end cover 532 rotates in the stepped hole 52a, allowing relative rotation between the knob 52 and the vertical rod body 53, preventing the vertical rod body 53 from disengaging from the stepped hole 52a, and converting the rotation of the knob 52 into the lifting and lowering action of the vertical rod body 53.

[0071] Compared with the prior art, the traditional clamp adopts direct insertion or buckle connection between the knob 52 and the rod body, which has the problems of poor connection stability and easy loosening. The present application uses the stepped hole 52a and the limiting end cover 532 to realize the rotation of the knob 52 relative to the rod body shell 51, and at the same time, the threaded connection provides precise axial displacement control for the vertical rod body 53, significantly improving the position holding ability of the clamp 542.

[0072] Through the above technical scheme, the present application effectively solves the clamping failure problem caused by unstable connection structure of the sample rod 50 during movement, and ensures that the solidified sample 1 maintains accurate centering state during transfer. The cooperation of the limiting end cover 532 and the stepped hole 52a further reduces the risk of mechanical interference caused by component shaking during operation, and improves the reliability and repeatability of the overall operation of the clamp.

[0073] The working process of the sample preparation clamp is as follows: two sample 1s of the same size are cut from a raw sample, the back surface (i.e. the opposite surface of the coating surface) of the sample 1 is adhered by hot degumming, the two sample 1s are fixed on the motion control rod body 42 respectively, and the M-Bond 610 epoxy resin special adhesive is adhered on the coating surface. Rotating the coarse adjustment screw shaft body 31 makes the coarse adjustment sleeve 32 move in the X-axis direction, and the left and right coarse adjustment sleeves 32 are in contact to realize the preliminary positioning function. Rotating and moving the pressing screw shaft body 41 in the X-axis direction can make the motion control rod body 42 move in the X-axis direction, so that the two sample 1s are in contact and further stressed to realize the pressure curing. At the same time of pressure curing, the resistance wires in the coarse adjustment sleeve 32 and the motion control rod body 42 are powered on to heat during the curing process.

[0074] After the pressure and heat curing are completed, the coarse adjustment sleeve 32 is retreated to the position away from the center by rotating the coarse adjustment screw shaft body 31. Moving the sample rod 50 in the Y-axis direction can unload the two sample 1s adhered from the motion control rod body 42. Rotating the knob 52 can realize clamping of the two sample 1s through the sample rod clamp 54. Moving the sample rod 50 again can make the two sample 1s pass through the second mounting groove 10b of the shell 10 to the central hole 10c below, and at this time, the whole sample preparation clamp can be placed above the polishing machine to realize polishing and thinning of the two sample 1s.

[0075] The present application also provides a coating material transmission electron microscope cross-section sample preparation device, which comprises a device shell, a polishing machine and a sample preparation clamp, the device shell has an inner cavity; the polishing machine is installed in the inner cavity; the sample preparation clamp is installed in the inner cavity and located above the polishing machine, and the specific structure of the sample preparation clamp is referred to the above-mentioned embodiments. Since the coating material transmission electron microscope cross-section sample preparation device adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0076] The device shell constitutes the main structure of the device, and a sealed inner cavity is designed in the inner cavity. The inner cavity is not only used for accommodating and protecting the core components, but more importantly, it has high rigidity and high stability, can effectively isolate external vibration interference, and provide an ideal static environment for the super-precision polishing process, which is a key prerequisite for obtaining a high-quality electronic transparent thin area without scratches and strain variation.

[0077] The polishing machine is precisely installed at the bottom of the inner cavity of the device shell. It usually includes a high-speed controllable polishing disc (or grinding wheel) system, a precise speed and pressure control system, and a necessary cooling liquid supply unit. Its function is to perform the final ion thinning pretreatment or direct thinning to the electronic transparent thickness of the sample 1, and it is required to run stably, with minimal vibration and precise control of parameters (such as speed and feed).

[0078] The sample preparation clamp is installed in the inner cavity through a high-precision three-dimensional adjusting support and is located directly above the polishing machine. This spatial layout enables the sample 1 reliably clamped by the clamp to contact the polishing disc of the polishing machine below at a precisely preset angle and position. The transverse clamping and centering function of the clamp, in combination with the precise rotary motion of the polishing machine, ensures that the sample 1 is uniformly and symmetrically stressed during the entire thinning process, and completely avoids the problems of wedge-shaped grinding or interface tearing caused by clamping deviation.

[0079] The above merely describes exemplary embodiments of the present application and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the content of the present application specification and drawings or direct / indirect application in other related technical fields under the technical concept of the present application is included in the patent protection scope of the present application.

Claims

1. A sample preparation clamp, characterized by, The utility model relates to a sample holder for polishing and thinning machine, comprising: a housing, which is provided with two first mounting slots, a second mounting slot communicated with the two first mounting slots and a central hole communicated with the second mounting slot, the second mounting slot being perpendicular to the two first mounting slots; two fixed sleeves, each of which is mounted in a first mounting slot; two coarse adjustment alignment assemblies, each of which is movably connected in a fixed sleeve, the two coarse adjustment alignment assemblies being used to contact each other to form a centering channel after being moved close to each other, each of the coarse adjustment alignment assemblies being provided with a movable slot; two fine adjustment clamping assemblies, each of which is movably connected in a movable slot, the two fine adjustment clamping assemblies being used to drive two samples into the centering channel to make the two samples contact each other in the centering channel and heat and solidify the two samples after being contacted in the centering channel; and a sample rod, which is movably connected to the second mounting slot and movably extends into the centering channel, the sample rod being used to unload the two samples after being solidified from the fine adjustment clamping assemblies and convey the two samples to extend out of the central hole for polishing and thinning machine to polish and thin the two samples. The coarse adjustment alignment assembly comprises:

2. The sample preparation clamp of claim 1, wherein, a coarse adjustment screw shaft body, which is rotatably connected in the fixed sleeve, one end of the coarse adjustment screw shaft body being provided with a first handle, the first handle being limited outside the fixed sleeve, the coarse adjustment screw shaft body being provided with the movable slot extending along the axis of the coarse adjustment screw shaft body; and a coarse adjustment sleeve, which is slidably connected in the fixed sleeve, the coarse adjustment sleeve being provided with a first threaded hole, one end of the coarse adjustment screw shaft body away from the first handle being threadedly connected at the first threaded hole, one end of the coarse adjustment sleeve away from the first threaded hole being provided with a through hole coaxially arranged with the first threaded hole, the through hole, the first threaded hole and the movable slot being communicated in sequence; wherein the coarse adjustment screw shaft body is rotated in the fixed sleeve to drive the coarse adjustment sleeve to linearly slide in the fixed sleeve, so that the two coarse adjustment sleeves contact each other to make the two through holes communicated to form the centering channel. The fixed sleeve is provided with a first movable hole and a second movable hole communicated with the first movable hole, one end of the coarse adjustment screw shaft body away from the first handle being rotatably connected at the first movable hole, the first movable hole being in a cylindrical shape in cross section, the second movable hole and the coarse adjustment sleeve being in a non-cylindrical shape in cross section, the coarse adjustment sleeve being slidably connected in the second movable hole.

3. The sample preparation clamp of claim 2, wherein, The fine adjustment clamping assembly comprises:

4. The sample preparation clamp of claim 2, wherein, a pressure applying screw shaft body, which is threadedly connected in the movable slot, one end of the pressure applying screw shaft body being provided with a second handle, the second handle being located outside the movable slot, the other end of the pressure applying screw shaft body being provided with a mounting hole; and a motion control rod body, one end of the motion control rod body being rotatably connected in the mounting hole, the other end of the motion control rod body being a square rod body, the through hole being a square hole, one end of the motion control rod body away from the second handle being movably provided in the through hole. ​ The pressure screw shaft body rotates in the movable groove to drive the motion control lever body to make two samples close to each other in the center channel.

5. The sample preparation clamp of claim 4, wherein, The coarse adjustment sleeve and the motion control lever body are both provided with resistance wires for heating the temperature of the coarse adjustment sleeve and the motion control lever body to solidify the samples.

6. The sample preparation clamp of claim 1, wherein, The shell is further provided with an access hole communicating with the second mounting groove. The sample rod comprises: A rod body shell extending into the second mounting groove from the access hole and being slidingly connected in the second mounting groove, the rod body shell having a moving groove; A knob rotatingly connected to one end of the rod body shell outside the access hole and being located outside the moving groove; A vertical rod body having one end rotatingly connected in the knob and being slidingly connected in the moving groove, the vertical rod body having the other end provided with a driving component; and Two sample rod clamping pieces connected with the driving component, the driving component being used to drive the two sample rod clamping pieces to clamp the solidified two samples. The knob is rotated to drive the vertical rod body to ascend relative to the rod body shell, so that the driving component drives the two sample rod clamping pieces to close to each other to clamp the solidified two samples.

7. The sample preparation clamp of claim 6, wherein, The two side faces of the driving component are two first wedge faces; The sample rod clamping piece comprises two assemblies and two clamping pieces, one end of each assembly being connected with one clamping piece, and one side face of each assembly being a second wedge face, each first wedge face being key groove matchedly connected with one second wedge face; The vertical rod body drives the driving component to ascend, so that the driving component drives the two clamping pieces to close to each other to clamp the solidified two samples.

8. The sample preparation clamp of claim 7, wherein, At least one guide protrusion is arranged on the groove wall of the moving groove; The other side face of each assembly is provided with a guide groove extending in the horizontal direction, and the guide protrusion is slidingly connected in the guide groove to enable the two assemblies to move in the horizontal direction.

9. The sample preparation clamp of claim 7, wherein, The sample preparation clamp further comprises two vertical guide rails arranged on the groove wall of the second mounting groove, the two vertical guide rails extending in the vertical direction of the second mounting groove and being arranged in a spaced manner; The sample rod further comprises two sliding blocks connected with the outer wall of the rod body shell and located on the two sides of the rod body shell, and each sliding block is slidingly connected in one vertical guide rail.

10. The sample preparation clamp of claim 6, wherein, The knob is provided with a stepped hole and a second threaded hole communicating with the stepped hole; One end of the rod body shell is threadedly connected in the second threaded hole, and the other end of the vertical rod body away from the driving component is provided with a limiting end cover rotatingly connected in the stepped hole, so that the knob only drives the rod body shell to ascend and descend.

11. A coating material transmission electron microscope cross-section sample preparation apparatus, characterized by, The coating material transmission electron microscope cross-section sample preparation device comprises: A device shell having an inner cavity; A grinding and polishing machine mounted in the inner cavity; and The sample preparation clamp according to any one of claims 1 to 10 is mounted in the inner cavity and located above the grinding and polishing machine.

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