A method and device for preparing high temperature speckle

Abstract

The present invention discloses a method for preparing high-temperature speckles and a preparation device thereof, and belongs to the technical field of speckle preparation. The method comprises the following preparation steps: S1, using a preparation device to make optimized UV glue spots on the surface of a specimen; S2, before the UV glue is cured, spraying white ceramic powder on the surface of the UV glue spots; S3, irradiating the surface of the specimen with an ultraviolet lamp to solidify the UV glue spots with ceramic powder, and then washing the excess ceramic powder on the surface of the specimen with water; S4, placing the specimen in a high-temperature box and heating it until the UV glue is ablated, leaving only the ceramic powder in the original position on the surface of the specimen. The technical scheme is used to solve the problem in the prior art of preparing high-temperature speckles by injecting a ceramic powder mixed solution with a dispensing machine, that is, there is a precipitation phenomenon in the ceramic powder mixed solution, which is easy to cause the needle of the dispensing machine to be blocked and the coverage of the ceramic powder to be uneven, and the differences between the several speckles formed are large, which seriously affects the preparation quality of the high-temperature speckles.

Description

Technical Field

[0001] The invention belongs to the technical field of speckle preparation, and in particular relates to a method for preparing high-temperature speckle and a preparation device thereof. Background Art

[0002] Digital Image Correlation (DIC) is a non-contact full-field deformation measurement method, which is the product of the combination of modern optoelectronic technology, digital image processing technology and computer technology. The deformation carrier is the deformation "sensing element", and its preparation quality directly affects the accuracy and precision of DIC measurement.

[0003] Ceramic powder is a material that can withstand temperatures above 1500°C, making it an ideal material for making high-temperature spots. However, since ceramic powder is a powder, it is impossible to directly use a dispensing machine to make high-temperature spots of ceramic powder. However, there are some preparation methods in the prior art, such as a parametric high-throughput preparation method for multi-scale high-temperature speckles in Chinese Patent 202210206323.0, which discloses a method for preparing speckles using a dispensing device injected with high-temperature resistant mucus. However, the quality of the speckles obtained in the above method is difficult to control to a certain extent, because when preparing high-temperature speckles, the ceramic powder needs to be Ceramic powder is mixed in alcohol suspension and then dispensing operation is carried out. The full and uniform mixing of ceramic powder and alcohol suspension is a prerequisite for preparing high-quality speckle. However, in actual operation, it is often difficult to ensure the full mixing of ceramic powder and alcohol suspension, and the mixed solution is prone to precipitation or agglomeration in a short time, which can easily lead to uneven coverage of ceramic powder in the high-temperature speckle prepared by the mixed solution and large content differences, which seriously affects the quality of the preparation of high-temperature speckle. At the same time, it is easy to cause the needle of the dispensing machine to be blocked, which seriously affects the preparation progress of high-temperature speckle and equipment maintenance. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a method for preparing high-temperature speckles and a preparation device thereof, so as to solve the problem that when high-temperature speckles are prepared by injecting a ceramic powder mixed solution using a dispensing machine in the prior art, the coverage of ceramic powder in the prepared high-temperature speckles is uneven and the difference is large, which seriously affects the preparation quality of the high-temperature speckles.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a method for preparing high temperature speckles, comprising the following preparation steps:

[0007] S1. Use a preparation device to make optimized UV glue spots on the surface of the specimen;

[0008] S2. Before UV glue is cured, spray white ceramic powder on the surface of UV glue spots;

[0009] S3. Irradiate the surface of the specimen with an ultraviolet lamp to solidify the UV glue spots with ceramic powder, and then remove the excess ceramic powder on the surface of the specimen;

[0010] S4. Place the specimen in a high temperature box and heat it until the UV glue is ablated, leaving only the ceramic powder at its original position on the surface of the specimen, thus obtaining high temperature speckles formed by the ceramic powder.

[0011] Furthermore, before step S1, the process also includes using a laser marking machine to make grooves at locations on the surface of the specimen where UV glue spots are to be made, and the preparation device delivers the UV glue into the grooves, which are tapered grooves that are larger at the top and smaller at the bottom.

[0012] Furthermore, an adhesive protective layer is provided on the surface of the specimen, and the groove is opened on the adhesive protective layer.

[0013] Furthermore, in step S3, the method for removing excess ceramic powder on the surface of the test piece is:

[0014] A block is customized by 3D printing or laser etching, and the block is provided with arc-shaped holes matching the shape and position of the UV glue spots on the surface of the specimen;

[0015] Coating glue on a surface of the block where the arc-shaped hole is located;

[0016] Snap the block onto the sample, press lightly, and then remove the block.

[0017] Further, it comprises a glue dispensing machine body, on which a lateral movement component for driving the glue dispensing head part to move lateraly and a vertical movement component for driving the glue dispensing head part to move vertically are provided;

[0018] The vertical moving assembly is provided with a glue dispensing and powder spraying assembly, the glue dispensing and powder spraying assembly includes a glue dispensing assembly and a powder spraying assembly, the glue dispensing assembly includes a glue dispensing head component, and the upper end of the glue dispensing head component is detachably connected to the moving component of the vertical moving assembly;

[0019] The powder spraying assembly includes an annular mounting cylinder, a piston assembly and a connecting column. The mounting cylinder is sleeved on the outer side of the dispensing head component. An end cover is provided at the upper end of the mounting cylinder, and a plurality of exhaust holes are provided at the lower end of the mounting cylinder. The plurality of exhaust holes are covered on the outside of the injection part of the dispensing head component, and the exhaust directions all point to the injection part of the dispensing head component. The piston assembly is slidably arranged inside the mounting cylinder, one end of the connecting column is fixed on the piston assembly, and the other end of the connecting column is fixed on the vertical moving assembly.

[0020] Furthermore, the piston assembly includes an outer piston ring with contact sealing and a middle piston block, the outer piston ring is arranged above the middle piston block, one end of the connecting column is fixed on the middle piston block, and a spring is symmetrically provided on the upper surface of the outer piston ring, one end of the spring is rotatably connected to the outer piston ring, and an adjusting screw is provided on the other end of the spring, the threaded end of the adjusting screw is fixedly connected to the spring, the other end of the adjusting screw passes through the end cover and is located above the end cover, and the adjusting screw is threadedly connected between the end covers.

[0021] Furthermore, the middle piston block includes a middle protrusion and an edge protrusion, the diameter of the middle protrusion is equal to the inner diameter of the outer piston ring, and the edge protrusion is arranged at the lower part of the side surface of the middle protrusion.

[0022] Furthermore, the lateral moving assembly is provided with a plurality of groups of glue dispensing and powder spraying assemblies.

[0023] Furthermore, the dispensing component is an injection syringe.

[0024] Furthermore, the dispensing injection syringe is equipped with a multi-hole dispensing needle.

[0025] Furthermore, the dispensing machine body is also equipped with a rotating platform for placing the test piece.

[0026] The beneficial effects of the present invention are:

[0027] (1) In the preparation method, ceramic powder is sprayed to make the ceramic powder evenly cover and adhere to the surface of the UV glue spots. Because the surface area of ​​each UV glue spot is almost the same under the action of the dispensing machine, the content of ceramic powder in the prepared high-temperature speckle is small, and the ceramic powder can be evenly distributed, which improves the preparation effect of the high-temperature speckle;

[0028] (2) Through the preparation device, the steps of preparing UV glue spots by the glue dispenser and spraying ceramic powder on the UV glue spots are carried out sequentially, and the step of spraying ceramic powder is realized only by the normal up and down displacement of the glue dispenser head component when clicking, without adding other electronic equipment and components, and the structure is simple and the design is ingenious;

[0029] (3) The setting of the outer piston ring and the middle piston block, that is, the operator only needs to adjust the position of the outer piston ring in the installation cylinder to adjust the spraying amount of ceramic powder. At the same time, by adjusting the position of the outer piston ring, the spraying amount of ceramic powder remains unchanged when the displacement of the dispensing head component changes;

[0030] (4) The present invention is implemented using open source tools, making it highly customizable, cost-effective, and automated. The movement of the preparation device is controlled by executing a user-designed code file to control its spatial position and UV glue extrusion amount. The printing of the preparation device is highly repeatable and can be performed parametrically and fully automatically on small and large samples.

[0031] (5) High throughput: The present invention can prepare speckles at different positions in multiple groups of dispensing and powder spraying components at the same time, and can also equip a single injection syringe with a multi-hole dispensing needle, effectively improving the efficiency of speckle preparation;

[0032] (6) Non-destructive: The present invention provides an adhesive protection layer on the surface of the specimen to avoid damage caused by opening the specimen, while improving the bonding effect on the speckle, ensuring that the specimen can prepare high-temperature speckle under non-destructive conditions and keeping the mechanical properties of the specimen unchanged.

[0033] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0035] Figure 1 It is a schematic diagram of a flow chart of the preparation method of the present invention;

[0036] Figure 2 It is a three-dimensional schematic diagram of the preparation device in the present invention;

[0037] Figure 3 It is a schematic cross-sectional view along one direction of the axis of the installation cylinder in the present invention;

[0038] Figure 4 It is a schematic cross-sectional view along another direction of the axis of the mounting cylinder in the present invention;

[0039] Figure 5 For the present invention Figure 3 A local enlarged schematic diagram of the middle A;

[0040] Figure 6 For the present invention Figure 4 Schematic diagram of the local method at B in the middle;

[0041] Figure 7 It is a partial installation schematic diagram of the piston assembly of the present invention inside the installation cylinder;

[0042] Figure 8It is a schematic diagram of a separated perspective view of the glue dispensing powder spraying assembly and the glue dispensing head component in the present invention;

[0043] Fig. 9 It is a schematic diagram of arranging a plurality of glue dispensing and powder spraying components on the glue dispensing machine body in the present invention;

[0044] Fig.10 A schematic diagram of another method of removing excess ceramic powder from a test piece in the method of the present invention.

[0045] The following are marked in the accompanying drawings:

[0046] Dispensing machine body 1, lateral moving component 2, vertical moving component 3, test piece 4, injection syringe 5, mounting cylinder 6, end cover 7, outer piston ring 8, middle piston block 9, spring 10, adjusting bolt 11, exhaust hole 12, connecting column 13, mounting plate 14, UV glue spot 15, block 16, arc groove 17, adhesive 18. DETAILED DESCRIPTION

[0047] like Figures 1 to 9 As shown, a method for preparing high temperature speckle of the present invention comprises the following preparation steps:

[0048] S1, using a preparation device to make optimized UV glue spots 15 on the surface of the specimen 4;

[0049] S2. Before the UV glue is cured, spray white ceramic powder on the surface of the UV glue spot 15;

[0050] S3, irradiating the surface of the test piece 4 with an ultraviolet lamp to solidify the UV glue spots 15 with ceramic powder, and then removing excess ceramic powder from the surface of the test piece 4;

[0051] S4, placing the specimen 4 in a high temperature box and heating it until the UV glue is ablated, leaving only the ceramic powder at the original position on the surface of the specimen 4, that is, obtaining high temperature speckles formed by the ceramic powder.

[0052] It should be noted that the above steps S3 and S4 are performed after the preparation device has completed the production of the required speckles on the surface of the specimen 4. The advantage of this is that the white ceramic powder is sprayed immediately after the UV glue spots 15 are produced. At this time, the surface of the UV glue spots 15 is in a softened state, which can better adhere to the ceramic powder. If the UV glue spots 15 are produced after all the production is completed and then sprayed with ceramic powder, the surface of the UV glue spots 15 produced first may have hardened, resulting in poor adhesion to the ceramic powder.

[0053] Before step S1, the process also includes using a laser marking machine to make grooves at the positions on the surface of the specimen 4 where UV glue spots 15 are required to be made, and the preparation device transports the UV glue into the grooves. This has the advantage of preventing the UV glue from flowing on the surface of the specimen 4 due to its fluidity, thereby preventing the surface of the specimen 4 where no high-temperature spots are required to be set from being adhered to by ceramic powder, causing the problem of event background contamination.

[0054] Preferably, the groove is a conical groove that is larger at the top and smaller at the bottom; the lower end of the conical groove is smaller, and the fluidity of the UV glue is not sufficient to pass through (the fluidity can be adjusted), so there will be no leakage of glue from the groove. However, when debonding at high temperature, since the UV glue can only withstand a high temperature of 300°C, the specimen 4 is placed in a high temperature box and heated at a temperature of 500°C. The UV glue will be ablated (disappear due to the physical phenomenon of vaporization or sublimation), and the ceramic powder will continue to adhere to the same position on the specimen 4. Since the UV glue will produce gas when it vaporizes or liquefies, the gas can be discharged from the smaller end of the conical groove. In this way, the gas will not be completely discharged upward to impact the ceramic powder, thereby avoiding the problem of ceramic powder adhering to the surface of the specimen 4 or the inner wall of the groove being dispersed by the gas. At the same time, the ceramic powder will not be reduced in adhesion to the surface of the specimen 4 or the inner wall of the groove and will fall off due to the impact and penetration of the gas.

[0055] Preferably, there is an adhesive protective layer on the surface of the specimen, and the groove is opened on the adhesive protective layer. The adhesive protective layer is used to avoid damage caused by the opening on the surface of the specimen 4 and to improve the adhesive effect on the speckle.

[0056] Preferably, in step S3, the method for removing excess ceramic powder on the surface of the test piece is:

[0057] A block 16 is customized by 3D printing or laser etching, and an arc-shaped hole 17 matching the shape and position of the UV glue spot 15 on the surface of the test piece is provided on the block 16;

[0058] The block 16 is coated with adhesive 18 on one surface of the arc hole 17, and the surface inside the arc hole 17 is not coated with adhesive 18;

[0059] The block 16 is buckled onto the sample, and after slight pressing, the block 16 is removed.

[0060] The UV glue spot 15 is located in the space of the arc hole 17 on the block 16, that is, the UV glue spot 15 will not be damaged when buckled. At the same time, when the surface of the block 16 coated with glue or double-sided tape contacts the surface of the specimen on which the UV glue spot 15 is set, the block 16 will adhere to and take away the excess ceramic powder on the surface of the specimen under the action of viscosity (in step S2, when the white ceramic powder is sprayed on the surface of the UV glue spot 15, part of the white ceramic powder will be sprayed on the specimen 4).

[0061] In an practicable manner, the following steps are also included before step S1:

[0062] Clean and dry the surface of the test piece 4;

[0063] Design and optimize speckle parameters, and write program files to control the operation of the preparation device.

[0064] The program file is written according to the pre-designed required speckle vector diagram, and the file consists of three parts, including the start part, the main part and the end part. The start part: set the initial position, set the position (x, y, z, R) of the preparation device and the initial amount of UV glue as the reference state; the main part: control the position of the preparation device and the extrusion amount of UV glue at the corresponding position; the end part: move the preparation device away from the surface of the specimen 4 and turn off the power.

[0065] The speckle parameters in the program file are optimized based on existing open source or commercial software, mainly including the speckle duty cycle, size and distribution form. The physical size of the speckle field is optimized for different measurement scales. The preparation device runs according to the program file to control the dripping of UV glue. After the UV glue is cured, a pattern consistent with the designed speckle parameters is finally formed.

[0066] In one practicable manner, the preparation device mainly includes a dispensing machine body 1, on which is provided a lateral moving component 2 for driving the dispensing head part to move lateraly, and a vertical moving component 3 for driving the dispensing head part to move vertically; it should be noted that the dispensing machine body 1, the lateral moving component 2 and the vertical moving component 3 are common mechanisms in dispensing machines in the prior art, and specifically, the lateral moving component 2 and the vertical moving component 3 both adopt a screw slide, which includes a slider.

[0067] The innovative structure in the technical solution is mainly a glue dispensing powder spraying assembly arranged at the position of the glue dispensing head component of the existing glue dispensing machine. Specifically, a glue dispensing powder spraying assembly is arranged on the slider of the vertical moving component 3. The glue dispensing powder spraying assembly includes a glue dispensing component and a powder spraying component. The glue dispensing component includes a glue dispensing head component. The upper end of the glue dispensing head component is detachably connected to the slider of the vertical moving component 3. The detachable connection is shown in the figure and can be in the form of a clamp;

[0068] The powder spraying assembly includes an annular mounting cylinder 6, a piston assembly and a connecting column 13. The mounting cylinder 6 can be understood as a main body having a shape after a circular ring is pulled up, and the end is a cone that covers the dispensing head component. The mounting cylinder 6 is sleeved on the outer surface of the dispensing head component. The upper end of the mounting cylinder 6 is provided with an end cover 7, and the lower end of the mounting cylinder 6 is provided with a plurality of exhaust holes 12. The plurality of exhaust holes 12 are covered on the outside of the injection site of the dispensing head component, and the exhaust directions all point to the injection site of the dispensing head component. The piston assembly is slidably arranged inside the mounting cylinder 6, one end of the connecting column 13 is fixed on the piston assembly, and the other end of the connecting column 13 is fixed on the vertical moving assembly 3.

[0069] The working principle of the powder spraying assembly is as follows: when setting the program of the preparation device, it is necessary to set that after the preparation device moves a UV glue spot 15 downward and extrude it, it is lifted up for a certain distance, and then moves horizontally to another position, and then the operation is repeated in this way; therefore, it is not difficult to understand that since the mounting cylinder 6 and the dispensing head component are connected by a detachable connection method such as bonding, that is, the up and down movement of the dispensing head component will drive the mounting cylinder 6 to move up and down together, and since the piston assembly is fixed on the mounting seat of the vertical moving assembly 3, that is, the piston assembly will not move with the movement of the mounting cylinder 6 When the UV glue spot 15 is made, the mounting cylinder 6 moves, and then when the mounting cylinder 6 moves, the piston assembly will produce a relative movement inside the mounting cylinder 6, and then the piston assembly will form a suction and extrusion state inside the mounting cylinder 6, that is, the ceramic powder is canned in the mounting cylinder 6. At this time, if the mounting cylinder 6 moves down, the piston assembly is in a suction state, and air is sucked from the exhaust hole 12. At this time, the ceramic powder will not be sprayed out. When the UV glue spot 15 is completed, the mounting cylinder 6 moves up. At this time, under the action of the piston assembly, the space between the mounting cylinder 6 and the exhaust hole 12 is squeezed, and the ceramic powder can be sprayed out from the exhaust hole 12, and then sprayed on the surface of the UV glue spot 15.

[0070] It is not difficult to understand that a separate ceramic powder tank can be set up, which is connected to the inside of the mounting cylinder 6 through a hose. The hose is provided with a one-way valve, which only allows the powder to be sucked into the mounting cylinder 6. That is, when the mounting cylinder 6 moves downward, the ceramic powder is sucked, and when the mounting cylinder 6 moves upward, the ceramic powder is squeezed and sprayed out from the scheduling hole.

[0071] In one practicable manner, the piston assembly includes an outer piston ring 8 and a middle piston block 9 with contact sealing. Specifically, the middle piston block 9 includes a middle protrusion and an edge protrusion. The diameter of the middle protrusion is equal to the inner diameter of the outer piston ring 8. The edge protrusion is arranged at the lower part of the side of the middle protrusion. The outer piston ring 8 is arranged above the middle piston block 9. One end of the connecting column 13 is fixed on the middle piston block 9. A spring 10 is symmetrically provided on the upper surface of the outer piston ring 8. One end of the spring 10 is rotatably connected to the outer piston ring 8. An adjusting screw is provided on the other end of the spring 10. The threaded end of the adjusting screw is fixedly connected to the spring 10. The other end of the adjusting screw passes through the end cover 7 and is located above the end cover 7. The adjusting screw is threadedly connected between the end cover 7.

[0072] The advantage of this arrangement is that the position of the outer piston ring 8 in the mounting tube 6 can be adjusted by adjusting the bolt 11, that is, adjusting the position of the outer piston ring 8 relative to the middle piston block 9. It is not difficult to understand that if the distance by which the mounting tube 6 moves up or down remains unchanged, if the spacing between the outer piston ring 8 and the middle piston block 9 is larger, then the time required for the two to be in contact and sealed is longer, that is, the actual movement distance of the ceramic powder absorbed after sealing is short, that is, the content of the ceramic powder absorbed and sprayed out is smaller, which is suitable for the production of high-temperature speckles with small diameters; similarly, the closer the distance between the two is, the greater the content of the ceramic powder absorbed, which is suitable for the production of large-diameter speckles.

[0073] The specific working principle is: when the outer piston ring 8 and the installation cylinder 6 move downward together, they will contact with the fixed middle piston block 9, and the two will be sealed after contact, that is, a completed piston block that is slidably connected to the installation cylinder 6 is formed, that is, when it continues to move downward, due to the obstruction of the edge protrusion, the middle piston block 9 will overcome the resistance of the spring 10 and drive the edge piston ring to move together, that is, at this time, the operation of suction (ceramic powder) is presented. Similarly, when the installation cylinder 6 rises, due to the release of elastic potential energy by the spring 10, the outer piston ring 8 will be squeezed on the middle piston block 9, and then move together, and then squeeze the air to spray out the ceramic powder absorbed in the installation cylinder 6. That is, this design method can adjust the spraying amount of ceramic powder, and then adapt to the diameter size of the speckle production.

[0074] In one feasible manner, a plurality of glue dispensing and powder spraying assemblies are provided on the lateral moving assembly 2, and the plurality of glue dispensing and powder spraying assemblies are connected to the slider via the mounting plate 14. The plurality of glue dispensing and powder spraying assemblies can realize the production of multiple groups of speckles at the same time, thereby improving the preparation efficiency.

[0075] In one practicable manner, the glue dispensing component is an injection syringe 5, and the glue dispensing injection syringe 5 is equipped with a multi-porous glue dispensing needle (one feed port and multiple discharge ports arranged side by side). The introduction of the injection needle can achieve high-throughput production of small-diameter speckles, and the minimum diameter of the speckle can be on the order of 100 μm.

[0076] In one feasible manner, the dispensing machine body 1 is also equipped with a rotating platform for placing the test piece 4. The preparation device can not only produce UV glue speckle patterns on a plane, but also on various non-planar test pieces 4. The speckle patterns can be produced directly on the non-planar test piece 4. Due to the existence of the curved surface, the distribution of the speckle spots will be uneven (the designed speckle pattern only considers the plane situation). However, if the dispensing machine body 1 is equipped with a rotating platform, then the curved test piece 4 can be rotated to match the position of the dispensing part, thereby producing a high-quality speckle pattern on the curved surface.

[0077] The invention is implemented using open source tools, making it highly customizable, cost-effective and automated. The movement of the preparation device is controlled by executing a user-designed code file to control its spatial position and UV glue extrusion amount. The printing of the preparation device is highly repeatable and can be performed parametrically and fully automatically on small and large samples.

[0078] High throughput: the present invention can prepare speckles at different positions in multiple groups of dispensing and powder spraying components at the same time, and can also equip a single injection syringe 5 with a multi-hole dispensing needle, effectively improving the efficiency of speckle preparation.

[0079] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A method for preparing high temperature speckle, characterized in that: The method comprises the following preparation steps: S1. Use a preparation device to make optimized UV glue spots on the surface of the specimen; S2. Before UV glue is cured, spray white ceramic powder on the surface of UV glue spots; S3. Irradiate the surface of the specimen with an ultraviolet lamp to solidify the UV glue spots with ceramic powder, and then remove the excess ceramic powder on the surface of the specimen; S4, placing the specimen in a high temperature box and heating it until the UV glue is ablated, leaving only the ceramic powder at the original position on the surface of the specimen, that is, obtaining high temperature speckles formed by the ceramic powder; The method for making the optimized UV glue spots before step S1 is as follows: A laser marking machine is used to make grooves at locations on the surface of the specimen where UV glue spots are required. The preparation device delivers UV glue into the grooves, which are tapered grooves that are larger at the top and smaller at the bottom. An adhesive protective layer is provided on the surface of the specimen, and the grooves are opened on the adhesive protective layer.

2. The method for preparing high temperature speckle according to claim 1, characterized in that: In step S3, the method for removing excess ceramic powder on the surface of the test piece is: A block is customized by 3D printing or laser etching, and the block is provided with arc-shaped holes matching the shape and position of the UV glue spots on the surface of the specimen; Coating glue on a surface of the block where the arc-shaped hole is located; Snap the block onto the sample, press lightly, and then remove the block.

3. A high temperature speckle preparation device for implementing any one of the methods of claims 1-2, characterized in that: The dispensing machine comprises a dispensing machine body, on which a lateral moving component for driving the dispensing head part to move lateraly and a vertical moving component for driving the dispensing head part to move vertically are provided; The vertical moving assembly is provided with a glue dispensing and powder spraying assembly, the glue dispensing and powder spraying assembly includes a glue dispensing assembly and a powder spraying assembly, the glue dispensing assembly includes a glue dispensing head component, and the upper end of the glue dispensing head component is detachably connected to the moving component of the vertical moving assembly; The powder spraying assembly includes an annular mounting cylinder, a piston assembly and a connecting column. The mounting cylinder is sleeved on the outer side of the dispensing head component. An end cover is provided at the upper end of the mounting cylinder, and a plurality of exhaust holes are provided at the lower end of the mounting cylinder. The plurality of exhaust holes are covered on the outside of the injection part of the dispensing head component, and the exhaust directions all point to the injection part of the dispensing head component. The piston assembly is slidably arranged inside the mounting cylinder, one end of the connecting column is fixed on the piston assembly, and the other end of the connecting column is fixed on the vertical moving assembly.

4. The high temperature speckle preparation device according to claim 3, characterized in that: The piston assembly includes an outer piston ring with contact sealing and a middle piston block, the outer piston ring is arranged above the middle piston block, one end of the connecting column is fixed on the middle piston block, a spring is symmetrically arranged on the upper surface of the outer piston ring, one end of the spring is rotatably connected to the outer piston ring, an adjusting screw is arranged on the other end of the spring, the threaded end of the adjusting screw is fixedly connected to the spring, the other end of the adjusting screw passes through the end cover and is located above the end cover, and the adjusting screw is threadedly connected between the end covers.

5. The device for preparing high temperature speckle according to claim 4, characterized in that: The middle piston block comprises a middle bulge and an edge bulge, the diameter of the middle bulge is equal to the inner diameter of the outer piston ring, and the edge bulge is arranged at the lower part of the side surface of the middle bulge.

6. The device for preparing high temperature speckle according to claim 3, characterized in that: The lateral moving assembly is provided with a plurality of groups of glue dispensing and powder spraying assemblies.

7. The high temperature speckle preparation device according to claim 3, characterized in that: The glue dispensing component is an injection syringe, and the glue dispensing injection syringe is equipped with a multi-hole glue dispensing needle.

8. The high temperature speckle preparation device according to claim 3, characterized in that: The dispensing machine body is also equipped with a rotating platform for placing test pieces.

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