Portable metallographic sample inlaying machine

Abstract

This invention relates to the field of metallographic specimen technology, and more particularly to a portable metallographic specimen mounting machine, comprising a housing, a mounting cylinder fixedly connected to the housing, a lower mold slidably connected inside the mounting cylinder, a detachably threaded cap connected to the mounting cylinder, a temperature control module and an exhaust module disposed on the mounting cylinder, an upper mold slidably connected to the mounting cylinder and sealed to the cap, a first driving member fixedly connected inside the cap, and an elastic pressing member fixedly connected to the telescopic end of the first driving member and slidably connected to the upper mold and sealed to the upper mold. This invention uses the elastic pressing member to press and fix the metallographic specimen throughout the mounting process, thereby ensuring the stability of the metallographic specimen during mounting, improving the positional accuracy and process reliability of the mounting, and simultaneously absorbing the force between the metallographic specimen and the pressing post, reducing the probability of specimen breakage and deformation, and ensuring the morphology of the metallographic specimen.

Description

Technical Field

[0001] This invention relates to the field of metallographic specimen technology, and more particularly to a convenient metallographic specimen mounting machine. Background Technology

[0002] Metallographic specimen mounting machines are key equipment for preparing metallographic samples in the field of materials science and engineering. Their core function is to embed and fix irregular, small or edge-protected metal specimens to form standard-sized mounting blocks, so as to facilitate subsequent grinding, polishing and microstructure observation. Portable mounting machines are the mainstream models, and are widely used in quality control in laboratories and industrial production sites due to their advantages of compact structure, simple operation and low cost.

[0003] However, in practice, existing portable mounting machines face a common and significant technical challenge during the hot-press mounting process: metallographic specimens are prone to uncontrollable displacement or tilting when the resin is under pressure and heat and in the molten stage. This problem stems from several factors: First, upon heating, the solid resin powder melts and transforms into a viscous flow state, disrupting the initial static equilibrium of the specimen. Second, the density difference between the specimen and the molten resin creates a buoyancy effect, causing the less dense specimen to float. Third, the fluid flow after the resin melts exerts a dragging force on the specimen. This displacement or tilting of the metallographic specimen results in a mismatch between the final polished observation plane and the target plane, requiring significant time and material rework or rendering the specimen unusable. Summary of the Invention

[0004] In order to overcome the shortcomings mentioned in the background art, the present invention provides a convenient metallographic sample mounting machine.

[0005] The technical solution is as follows: A portable metallographic sample mounting machine includes a housing, an intelligent control console on the housing, a mounting cylinder fixedly connected to the housing, a lower mold slidably connected inside the mounting cylinder, a drive module inside the housing for driving the lower mold to slide along the mounting cylinder, a cover detachably connected to the mounting cylinder, a temperature control module for controlling the internal material temperature and an exhaust module for discharging internal gas on the mounting cylinder, an upper mold slidably connected to the cover and sealed with the mounting cylinder, a first drive component fixedly connected inside the cover, and an elastic pressing component slidably connected to the upper mold at the telescopic end of the first drive component.

[0006] More preferably, the elastic pressing member is composed of a pushing cylinder, a pressing column and a first elastic member. The pushing cylinder is fixedly connected to the telescopic end of the first driving member, the pushing cylinder is slidably connected to the pressing column, the pressing column is slidably and sealingly connected to the upper mold, and the first elastic member is located between the pressing column and the pushing cylinder.

[0007] More preferably, the upper mold is provided with a plurality of injection channels in a circular array, the cover is fixedly connected to a material conveying pipe with the same number as the injection channels, the plurality of injection channels are respectively connected to the corresponding material conveying pipe, the cover is fixedly connected to a main injection pipe, and the plurality of material conveying pipes are all fixedly connected to and connected to the main injection pipe.

[0008] More preferably, the discharge end and the inlet end of the injection channel are completely misaligned in the horizontal projection.

[0009] More preferably, the upper mold and the cap are slidably connected together with a number of sealing pistons equal to the number of injection channels, and the sealing pistons are used to seal the discharge end of the corresponding injection channel.

[0010] More preferably, a rotating ring is rotatably connected inside the cover, and the rotating ring is provided with the same number of sliding grooves as the sealing pistons. The sealing pistons slide in the corresponding sliding grooves. A toothed ring is fixedly connected to the rotating ring, and a second driving member is fixedly connected inside the cover. The output shaft of the second driving member is fixedly connected to a spur gear that meshes with the toothed ring.

[0011] More preferably, a pressure sensor is fixedly connected inside the push cylinder, and the first elastic element is located between the pressure sensor and the pressing column. The pressure sensor is used to provide feedback on the pressing force of the pressing column on the metallographic sample.

[0012] More preferably, the pressing column is provided with a plurality of limiting grooves arranged in a linear array, and the pushing cylinder is slidably connected to a limiting block, the limiting block being used to insert into the limiting groove and lock the pressing column.

[0013] More preferably, an electromagnet is fixedly connected inside the pushing cylinder, and a second elastic element is provided between the electromagnet and the limiting block. The electromagnet is used to control the movement of the limiting block.

[0014] More preferably, the lower mold is provided with a cooling pipe, which is used to cool the material near the metallographic sample at a specific point.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The metallographic specimen is pressed and fixed throughout the mounting process using an elastic pressure element, thereby ensuring the stability of the specimen during mounting and improving the positional accuracy and process reliability. Simultaneously, the elastic pressure element absorbs the force between the metallographic specimen and the pressure post, reducing the probability of specimen breakage and deformation, and ensuring the specimen's morphology.

[0016] 2. By coordinating the injection channel and the delivery pipe, the resin particle injection process is modified to occur after the metallographic sample is fixed. This ensures that the pressing column acts directly and stably on the clean surface of the metallographic sample, rather than on the loose resin particles, thereby providing a reliable and constant pre-tightening force. This fundamentally avoids unstable fixing, pressure transmission deviation, or secondary sample displacement caused by resin particle accumulation or uneven distribution, and improves the positional accuracy of the mounting and the reliability of the process.

[0017] 3. By locally and directionally cooling the lower layer of resin close to the metallographic sample, it is made to solidify first to lock the position of the metallographic sample. Then, the pressing column and the pushing cylinder are locked together, so that the pressing column is forcibly withdrawn from the resin particles. The upper layer of resin, which is still in a molten state, is used to fill the hole left by the pressing column. This ensures that a standard inlay specimen with no internal voids, complete shape and accurate position of metallographic sample is finally obtained, which improves the precision and integrity of sample preparation. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the outer casing of the present invention; Figure 3 This is a three-dimensional cross-sectional view of the cap structure of the present invention; Figure 4 This is a three-dimensional cross-sectional view of the mold of the present invention; Figure 5 This is a three-dimensional cross-sectional view of the push cylinder of the present invention; Figure 6 This is a three-dimensional cross-sectional view of the mold of the present invention; Figure 7 This is a three-dimensional structural diagram of the rotating ring and sliding groove of the present invention; Figure 8 This is a three-dimensional structural diagram of the limiting block and electromagnet of the present invention.

[0019] The markings in the attached diagram are as follows: 1. Outer shell; 2. Intelligent control console; 3. Insert cylinder; 4. Lower mold; 5. Drive module; 6. Cover; 7. Temperature control module; 8. Exhaust module; 9. Upper mold; 10. First drive component; 11. Elastic pressing component; 201. Push cylinder; 202. Pressing column; 203. First elastic component; 301. Injection channel; 302. Material conveying pipe; 303. Injection manifold; 401. Sealing piston; 402. Rotary ring; 403. Slide groove; 404. Gear ring; 405. Second drive component; 406. Spur gear; 501. Pressure sensor; 502. Limiting groove; 503. Limiting block; 504. Electromagnet; 505. Second elastic component; 506. Cooling pipe. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] Example 1 A portable metallographic specimen mounting machine is provided to improve the positional accuracy and process reliability of the mounting.

[0022] like Figures 1-4 As shown, the device includes a housing 1, with an intelligent control console 2 on the front side of the housing 1. The intelligent control console 2 is a human-machine interface that integrates display and input functions. It is used to set and monitor core process parameters such as temperature, pressure, and time during the inlay process, thereby achieving precise and automated operation. An inlay cylinder 3 is fixedly connected to the housing 1 (there are two processing stations in the figure, but this article describes one processing station). A lower mold 4 is slidably connected inside the inlay cylinder 3. A drive module 5 is installed inside the housing 1 to drive the lower mold 4 to slide along the inlay cylinder 3. The drive module 5 consists of a servo motor, two meshing transmission gears, and a splined shaft. The servo motor is fixedly connected inside the housing 1. The bottom of the inlay cylinder 3 is rotatably connected to one of the transmission gears, and the other transmission gear is fixedly connected to the output shaft of the servo motor. The transmission gear at the bottom of the inlay cylinder 3 is threadedly connected to the lower mold 4. The splined shaft is fixedly connected to the bottom inside the housing 1 and is splinedly connected to the lower mold 4.

[0023] The lower mold 4, in conjunction with the drive module 5, allows for precise control of its movement within the insert cylinder 3. This control is used to receive samples, apply molding pressure, and eject finished products. The insert cylinder 3 is detachably threaded with a cap 6. Initially, the cap 6 and insert cylinder 3 are in a mating state. The insert cylinder 3 is equipped with a temperature control module 7 for controlling the internal material temperature and an exhaust module 8 for venting internal gases. The temperature control module 7 heats the resin within the insert cylinder 3 to ensure its melting and solidification. Existing heating methods include resistance wire heating. The exhaust module 8 vents air bubbles generated during resin melting and ensures that particles within the insert cylinder 3 are not expelled with the gas. Existing vacuum exhaust systems and degassing devices are used, and their details will not be elaborated upon. The cap 6 is fixedly connected to an upper mold 9 that is slidably and sealingly connected to the insert cylinder 3. The upper mold 9, lower mold 4, and insert cylinder 3 together form a closed molding cavity. A first drive component 10, an electric push rod, is fixedly connected inside the cap 6. The telescopic end of the first drive component 10 is fixedly connected to an elastic pressing component 11 that is slidably and sealingly connected to the upper mold 9.

[0024] like Figure 5As shown, the elastic pressing member 11 consists of a pushing cylinder 201, a pressing column 202, and a first elastic member 203. The first elastic member 203 is a spring, used to press the pressing column 202 against the alloy phase sample. The pushing cylinder 201 is fixedly connected to the telescopic end of the first driving member 10, and the pushing cylinder 201 is slidably connected to the pressing column 202. The pressing column 202 is slidably connected to the upper mold 9. In the initial state, the bottom of the pressing column 202 is coplanar with the lower side of the upper mold 9, and the first elastic member 203 is located between the pressing column 202 and the pushing cylinder 201. In this embodiment, the first elastic member 203 connects the pushing cylinder 201 and the pressing column 202, and the telescopic end of the first driving member 10 can drive the pressing column 202 to move through the pushing cylinder 201 and the first elastic member 203.

[0025] like Figure 3 , Figure 4 and Figure 6 As shown, the upper mold 9 is provided with three injection channels 301 arranged in a ring. The cap 6 is fixedly connected with the same number of feed pipes 302 as the injection channels 301. The three injection channels 301 are respectively connected to the corresponding feed pipes 302. The top of the cap 6 is fixedly connected to the injection manifold 303. The three feed pipes 302 are all fixedly connected to and connected to the injection manifold 303. The injection manifold 303 is the resin inlet, receiving resin particles supplied from the outside. The three feed pipes 302 are arranged in a ring array, which evenly distributes the resin from the injection manifold 303 to the three independent injection channels 301, realizing the uniform distribution of resin at multiple points in a ring and completing uniform filling. The discharge end and the inlet end of the injection channel 301 are completely misaligned in the horizontal projection. After several embeddings, the injection channels 301, feed pipes 302 and injection manifold 303 can be cleaned to ensure smooth resin feeding.

[0026] like Figure 3 , Figure 6 and Figure 7As shown, the upper mold 9 and the cap 6 are slidably connected together with a sealing piston 401, the same number as the injection channels 301. The sealing piston 401 is used to block the discharge end of the corresponding injection channel 301. In the initial state, the sealing piston 401 keeps the discharge end of the adjacent injection channel 301 blocked, and the lower side of the sealing piston 401 is coplanar with the lower side of the upper mold 9. A rotating ring 402 is rotatably connected inside the cap 6. The rotating ring 402 is provided with a sliding groove 403, the same number as the sealing piston 401. The top of the sealing piston 401 slides within the corresponding sliding groove 403. The rotating ring 402 drives the sliding groove 403 to rotate, and the sliding groove 403 can push the adjacent sealing piston. The piston 401 moves up and down to open and block the discharge end of the adjacent injection channel 301. The rotating ring 402 is fixedly connected to the gear ring 404. The cover 6 is fixedly connected to the second driving component 405, which is a servo motor. The output shaft of the second driving component 405 is fixedly connected to the spur gear 406 that meshes with the gear ring 404. The output shaft of the second driving component 405 can drive the rotating ring 402 to rotate through the spur gear 406 and the gear ring 404.

[0027] Working principle: When metallographic specimens need to be mounted, the operator rotates the cover 6 to separate it from the mounting cylinder 3. The cover 6 then slides the upper mold 9 out of the mounting cylinder 3. The drive module 5 is then activated, causing the adjacent lower mold 4 to slide upwards along the corresponding mounting cylinder 3 until the upper side of the lower mold 4 is flush with the top of the mounting cylinder 3. The drive module 5 is then deactivated, and the operator places the metallographic specimen to be mounted in the middle of the upper side of the lower mold 4. The drive module 5 is then activated again, causing the adjacent lower mold 4 to move downwards. The lower mold 4 moves the metallographic specimen downwards synchronously until it reaches the set position. The drive module 5 is then deactivated, and the operator manipulates the cover 6 to align with the mounting cylinder 3. At this point, the upper mold 9 slides into the mounting cylinder 3.

[0028] After the cap 6 is aligned with the inlay cylinder 3, the operator activates the first drive unit 10, causing the telescopic end of the first drive unit 10 to move the push cylinder 201 downwards a specific distance (determined by the operator based on the metallographic sample, thereby altering the elastic force stored in the first elastic element 203 after the pressing column 202 is attached to the metallographic sample). The push cylinder 201, through the first elastic element 203, drives the pressing column 202 downwards synchronously until the pressing column 202 contacts the metallographic sample on the lower mold 4. Then, the first drive unit 10 continues to drive the push cylinder 201 downwards, at which point the pressing column 202... When the metallographic sample is limited and cannot move further downward, the first elastic element 203 is compressed until the telescopic end of the first driving element 10 stops moving. At this time, the metallographic sample is fixed on the lower mold 4 by the pressing column 202. The elastic top pressing element 11 presses and fixes the metallographic sample throughout the entire inlay process, thereby ensuring the stability of the metallographic sample during the inlay process and improving the positional accuracy and process reliability of the inlay. At the same time, the elastic top pressing element 11 absorbs the force between the metallographic sample and the pressing column 202, reducing the probability of the metallographic sample breaking and deforming, and ensuring the stability of the shape and position of the metallographic sample.

[0029] After metallographic fixation is completed, the operator activates the second drive unit 405. The output shaft of the second drive unit 405 drives the rotating ring 402 to rotate via the spur gear 406 and the gear ring 404. The rotating ring 402 drives the three sliding grooves 403 on it to rotate synchronously. The rotation of the sliding grooves 403 pushes the adjacent sealing pistons 401 upward until the sealing pistons 401 release the blockage of the corresponding injection channels 301. Then, the second drive unit 405 is turned off, and the operator begins to inject resin particles into the injection manifold 303. The resin particles enter the three conveying channels along the injection manifold 303. Inside pipe 302, resin particles flow downwards along the conveying pipe 302 and enter the space between the lower mold 4 and the upper mold 9 along the corresponding injection channel 301. After the resin particles are fed out, the second drive unit 405 is activated again, causing the output shaft of the second drive unit 405 to reset and rotate. The output shaft of the second drive unit 405 drives the rotating ring 402 to reset and rotate through the spur gear 406 and the gear ring 404. The rotating ring 402 drives the three sealing pistons 401 to move downwards and block the injection channel 301 through the sliding groove 403 on it. Then the second drive unit 405 is closed again. By cooperating with the injection channel 301 and the conveying pipe 302, the resin particle injection process can be set after the metallographic sample is fixed, ensuring that the pressing column 202 acts directly and stably on the clean surface of the metallographic sample, rather than on the loose resin particles, thereby providing a reliable and constant pre-tightening force. This fundamentally avoids unstable fixing, pressure transmission deviation, or secondary sample displacement caused by resin particle accumulation or uneven distribution, and improves the positional accuracy and process reliability of the mounting.

[0030] After the resin particles are injected, the temperature control module 7 is turned on to heat the resin particles in the insert cylinder 3. At the same time, the drive module 5 drives the lower mold 4 to move upward, so that the lower mold 4 squeezes the resin particles inside. The telescopic end of the first drive member 10 drives the pressing column 202 to move synchronously through the push cylinder 201 and the first elastic member 203. When the resin particles are completely melted and completely filled between the lower mold 4 and the upper mold 9, the drive module 5, the first drive member 10 and the temperature control module 7 are turned off, and the molten resin begins to cool.

[0031] After the resin has fully cured, the staff separates the cap 6 from the mounting tube 3. During this process, the telescopic end of the first drive component 10 drives the pressing column 202 to move upward relative to the upper mold 9 through the pushing cylinder 201 and the first elastic component 203. The pressing column 202 separates from the cured resin. Then, the drive module 5 is turned on, so that the lower mold 4 pushes the cured resin upward along the mounting tube 3 until it is discharged from the mounting tube 3. Then, the staff removes the cured resin. At this moment, the metallographic sample mounting work is completed. Then, the drive module 5 controls the lower mold 4 to return to the initial position and the cap 6 is reattached to the mounting tube 3. When it is necessary to mount the metallographic sample again, the above steps are repeated.

[0032] Example 2 A convenient metallographic sample mounting machine is further improved based on Example 1.

[0033] like Figure 4 and Figure 8 As shown, a pressure sensor 501 is fixedly connected inside the push cylinder 201. The first elastic element 203 is located between the pressure sensor 501 and the pressing column 202. The pressure sensor 501 is used to provide feedback on the pressing force of the pressing column 202 on the metallographic sample. The pressure sensor 501 detects in real time the reaction force generated when the first elastic element is compressed. This force value is equivalent to the actual pressing force applied by the pressing column 202 to the metallographic sample. The system can intelligently adjust the feed distance of the telescopic end of the first drive member 10 according to the preset or automatically calculated ideal pressure value, so as to achieve different hardness, shape, and brittleness. The metallographic sample is subjected to an optimized and constant protective pressure, which can ensure that the sample is firmly fixed and prevent sample damage. The pressing column 202 is provided with several limiting grooves 502 arranged in a linear array. The pushing cylinder 201 is slidably connected to the limiting block 503. The limiting block 503 is magnetic and is used to insert into the limiting groove 502 and lock the pressing column 202, so as to rigidly lock the pressing column 202 and the pushing cylinder 201 into one, eliminating the elastic buffer between the two, so that the telescopic end of the first driving member 10 can accurately control the movement distance of the pressing column 202.

[0034] An electromagnet 504 is fixedly connected inside the push cylinder 201. When the electromagnet 504 is energized, it has the same magnetism as the opposite side of the limiting block 503. A second elastic element 505 is provided between the electromagnet 504 and the limiting block 503. The second elastic element 505 is a tension spring. The second elastic element 505 is used to drive the limiting block 503 to reset. The electromagnet 504 is used to control the movement of the limiting block 503. A cooling pipe 506 is provided inside the lower mold 4. The cooling pipe 506 is used to cool the material near the metallographic sample at a fixed point, so that the resin around the metallographic sample is preferentially cured to form an anchoring layer for the metallographic sample, which firmly fixes the metallographic sample in the predetermined position of the mold. The upper resin remains in a molten and flowable state, which is the basic condition for filling the hole when the pressing column 202 is removed later.

[0035] Working principle: During the mounting process of the metallographic sample, the compression of the first elastic element 203 acts on the pressure sensor 501. The pressure sensor 501 can detect the pressing force of the pressing column 202 on the metallographic sample, thereby controlling the feed distance of the telescopic end of the first driving element 10. This allows for the adjustment of the pressing force on metallographic samples of different materials and shapes. After the resin particles have melted and filled the space between the lower mold 4 and the upper mold 9, the pressure sensor 501 provides feedback on the relative distance between the pushing cylinder 201 and the pressing column 202, thereby controlling the first driving element. The telescopic end of 10 drives the push cylinder 201 to move, causing the push cylinder 201 to drive the limiting block 503 inside it to move synchronously, thereby aligning the limiting block 503 with the nearest limiting groove 502 on the pressing column 202 and closing the first drive member 10. Then, cold air is injected into the cooling pipe 506 (the cooling time is adjusted according to the metallographic height), so that the resin particles near the lower mold 4 are preferentially solidified and the metallographic sample is fixed. The resin particles near the upper metallographic layer are still in a molten state to ensure that the resin around the pressing column 202 is still in a molten state.

[0036] After the resin particles at the lower mold 4 are cured first, the electromagnet 504 is turned on, causing the electromagnet 504 to push the limiting block 503 into the corresponding limiting groove 502, locking the pushing cylinder 201 and the pressing column 202 together. At the same time, the second elastic element 505 is stretched, and then the telescopic end of the first driving element 10 is opened. The pushing cylinder 201 drives the pressing column 202 to move upward. After the pressing column 202 returns to its initial state, the first driving element 10 is turned off, thereby achieving the hard withdrawal of the pressing column 202 and ensuring the integrity of the specimen after the molten resin particles are cured. At the same time, the driving module 5 drives the lower mold 4 to move upward, pushing the resin particles between the lower mold 4 and the upper mold 9 to fill the hole left by the withdrawal of the pressing column 202, so that the resin particles between the lower mold 4 and the upper mold 9 are standard cylindrical bodies. Then the temperature control module 7 is turned off and the injection of cold air into the cooling pipe 506 is stopped, waiting for the resin particles to cure as a whole, completing the metallographic specimen mounting work.

[0037] By locally and directionally cooling the lower layer of resin close to the metallographic sample, it is allowed to solidify first to lock the position of the metallographic sample. Then, the pressing column 202 is safely removed, and the upper layer of resin, which is still in a molten state, is used to fill the hole left by the pressing column 202. This ensures that a standard inlay specimen with no internal voids, a complete shape, and a precise position of the metallographic sample is obtained, thus improving the precision and integrity of the sample preparation.

[0038] After the resin particles have cured as a whole, the telescopic end of the first driving component 10 is opened, causing the telescopic end of the first driving component 10 to drive the push cylinder 201 to return to the initial position. The first elastic component 203 is simultaneously reset and extended. Then, the first driving component 10 is closed and the electromagnet 504 is turned off, releasing the magnetic force of the electromagnet 504 on the limiting block 503. This causes the second elastic component 505 to pull the limiting block 503 to return to its original position. The limiting block 503 is separated from the limiting groove 502 on the pressing column 202. Then, the cap 6 is separated from the inlay cylinder 3, and the cured specimen is taken out.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A portable metallographic sample mounting machine, comprising a housing (1), an intelligent control console (2) provided on the housing (1), a mounting cylinder (3) fixedly connected to the housing (1), a lower mold (4) slidably connected inside the mounting cylinder (3), a drive module (5) for driving the lower mold (4) to slide along the mounting cylinder (3) provided inside the housing (1), a cover (6) detachably connected to the mounting cylinder (3), a temperature control module (7) for controlling the internal material temperature and an exhaust module (8) for discharging internal gas, characterized in that, The cover (6) is fixedly connected to an upper mold (9) that is slidably connected to the inlay tube (3). A first driving member (10) is fixedly connected inside the cover (6). An elastic pressing member (11) that is slidably connected to the telescopic end of the first driving member (10) is fixedly connected to the upper mold (9).

2. The portable metallographic sample mounting machine according to claim 1, characterized in that, The elastic pressing member (11) is composed of a push cylinder (201), a pressing column (202) and a first elastic member (203). The push cylinder (201) is fixedly connected to the telescopic end of the first driving member (10). The push cylinder (201) is slidably connected to the pressing column (202). The pressing column (202) is slidably connected to the upper mold (9). The first elastic member (203) is located between the pressing column (202) and the push cylinder (201).

3. The portable metallographic specimen mounting machine according to claim 1, characterized in that, The upper mold (9) is provided with a plurality of injection channels (301) arranged in a ring array. The cover (6) is fixedly connected with a material conveying pipe (302) of the same number as the injection channels (301). The plurality of injection channels (301) are respectively connected to the corresponding material conveying pipe (302). The cover (6) is fixedly connected to a main injection pipe (303). The plurality of material conveying pipes (302) are all fixedly connected to and connected to the main injection pipe (303).

4. A portable metallographic specimen mounting machine according to claim 3, characterized in that, The discharge end and the feed end of the injection channel (301) are completely misaligned in the horizontal projection.

5. A portable metallographic specimen mounting machine according to claim 4, characterized in that, The upper mold (9) and the cover (6) are jointly and slidably connected with a number of sealing pistons (401) equal to the number of the injection channels (301). The sealing pistons (401) are used to block the discharge end of the corresponding injection channel (301).

6. A portable metallographic sample mounting machine according to claim 5, characterized in that, A rotating ring (402) is rotatably connected inside the cover (6). The rotating ring (402) is provided with the same number of sliding grooves (403) as the sealing piston (401). The sealing piston (401) slides in the corresponding sliding groove (403). A toothed ring (404) is fixedly connected to the rotating ring (402). A second driving member (405) is fixedly connected inside the cover (6). The output shaft of the second driving member (405) is fixedly connected to a spur gear (406) that meshes with the toothed ring (404).

7. A portable metallographic specimen mounting machine according to claim 2, characterized in that, A pressure sensor (501) is fixedly connected inside the push cylinder (201). The first elastic element (203) is located between the pressure sensor (501) and the pressing column (202). The pressure sensor (501) is used to provide feedback on the pressing force of the pressing column (202) on the metallographic sample.

8. A portable metallographic specimen mounting machine according to claim 7, characterized in that, The pressing column (202) is provided with a plurality of limiting grooves (502) arranged in a linear array. The pushing cylinder (201) is slidably connected to a limiting block (503). The limiting block (503) is used to insert into the limiting groove (502) and lock the pressing column (202).

9. A portable metallographic specimen mounting machine according to claim 8, characterized in that, An electromagnet (504) is fixedly connected inside the push cylinder (201). A second elastic element (505) is provided between the electromagnet (504) and the limiting block (503). The electromagnet (504) is used to control the movement of the limiting block (503).

10. A portable metallographic sample mounting machine according to claim 1, characterized in that, The lower mold (4) is provided with a cooling pipe (506), which is used to cool the material near the metallographic sample at a fixed point.

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