Non-cutting sample preparation device and method for material sheet sample

Abstract

The invention discloses a non-cutting sample preparation device and method for a material sheet sample, and relates to the technical field of powder tabletting sample preparation. The device comprises a bottom frame, a hydraulic telescopic assembly is arranged at the top of the bottom frame, an upper pressing die assembly is fixedly installed at the bottom of the telescopic end of the hydraulic telescopic assembly, and a lower pressing die assembly is fixedly installed at the top of the bottom frame. By the adoption of the design of the inverted-cone-shaped stepped downward pressing mold assembly, when powder is laid in the downward pressing mold assembly, the effect that the middle amount is large can be kept, meanwhile, only the top of the powder needs to be scraped to be flat, the powder amount control precision is high, the tabletting and sample preparation quality is high, the device can be suitable for tabletting and sample preparation of different amounts of powder, mold replacement is not needed, and the production cost is reduced. Meanwhile, a step sectional type pressing mode is adopted, the pressing force is gradually increased, pressure can be applied more uniformly, and the density difference of the sheets caused by non-uniform pressure distribution in the single high-pressure pressing process is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of powder tabletting sample preparation, and in particular to a non-cutting sample preparation device and method for a material thin slice sample. Background Art

[0002] X-ray fluorescence spectrometry is a relative analysis method. The standard sample must have a similar chemical composition and the same physical structure as the analysis sample. In X-ray fluorescence spectrometry analysis, the purpose of sample preparation is to process the original sample into a sample with uniform component distribution, flat surface, overall representativeness, suitable specifications, and can be directly fed into the instrument for measurement. According to the original form of the sample, the sample can be divided into solid, powder and liquid. The sample processing method is different for different forms. Powder tableting is a commonly used sample preparation method for X-ray fluorescence spectrometry analysis.

[0003] The sample preparation steps of powder tableting are as follows: the sample is crushed and dried, processed to a certain particle size by a grinding device, and finally pressed into a stable disc by a sample pressing device. During the tableting operation, the powder needs to be placed in the tableting mold, and the middle part needs to be slightly higher to make the tableting uniform. This makes it difficult to accurately control the amount of powder added during the actual operation, affecting the quality of the thin sheet molding; at the same time, when the amount of powder is small, the pressed thin sheet is too thin due to the fixed size of the mold, and a qualified sample cannot be obtained. In a Chinese patent (publication number: CN117388022A), a concentric circular tablet press for micro-sample preparation is disclosed. Since the base of the tablet press can be disassembled, the base can be replaced, and the sizes of the inner circle cutouts and outer circle cutouts of different bases can be inconsistent with each other; and the concentric circular punch tool and the first and second tool bodies contained therein can be disassembled and replaced, and the sizes of different first tool bodies can be inconsistent with each other, and the sizes of different second tool bodies can be inconsistent with each other. By replacing materials to be cut of different thicknesses, concentric circular tablets of different thicknesses can also be cut. In this way, concentric circular pieces of different sizes and thicknesses can be cut out. This patent mainly uses the method of replacing the pressure head and the mold to achieve the compression of different circular samples, which affects the efficiency of tableting. At the same time, this patent places the concentric circular paper on the tableting mold first, and then puts the mixture of the sample and potassium bromide into the middle hole. The pressed transparent thin sheet is attached to the center of the circular paper. The same as the prior art, the powder is directly added to the tableting mold, and the amount of powder added cannot be accurately controlled. In addition, the compression of trace powder requires the help of concentric circular paper. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and provide a non-cutting sample preparation device and method for material slice samples.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: A non-cutting sample preparation device for a material sheet sample comprises a base frame, a hydraulic telescopic assembly is arranged on the top of the base frame, an upper die assembly is fixedly installed at the bottom of the telescopic end of the hydraulic telescopic assembly, and a lower die assembly is fixedly installed on the top of the base frame; The upper die assembly includes a connecting piece, which is fixedly mounted on the telescopic end of the hydraulic telescopic assembly, an outer pressure head is fixedly mounted on the bottom of the connecting piece, a telescopic intermediate pressure head is arranged inside the outer pressure head, and a telescopic inner pressure head is arranged inside the intermediate pressure head; The lower die assembly comprises an outer die, which is mounted on a base frame. An outer die is provided with an outer die groove on the top, a retractable middle top column is provided inside the outer die groove, and a retractable inner top column is provided inside the middle top column.

[0006] Furthermore, a hydraulic chamber 1 is provided inside the outer pressure head, the middle pressure head is sealingly and slidingly connected in the hydraulic chamber 1, a tension spring 1 is provided between the top of the middle pressure head and the top of the hydraulic chamber 1, an upper hydraulic hole is provided on the top of the outer pressure head, the upper hydraulic hole is connected to the hydraulic chamber 1, and a solenoid valve 1 is provided on the top of the upper hydraulic hole.

[0007] Furthermore, a hydraulic chamber 2 is opened inside the intermediate pressure head, the inner pressure head is sealingly and slidingly connected in the hydraulic chamber 2, a tension spring 2 is arranged between the top of the inner pressure head and the top of the hydraulic chamber 2, and a solenoid valve 2 is fixedly installed on the top of the outer pressure head, and the solenoid valve 2 is connected to the hydraulic chamber 2 through the upper hydraulic inner tube.

[0008] Furthermore, the inner tops of the hydraulic chambers 1 and 2 are both provided with spring grooves, and the inner top of the hydraulic chamber 1 is provided with an upper receiving groove, which is located in the middle of the spring groove, and the upper hydraulic inner tube can be received in the upper receiving groove.

[0009] Furthermore, a sealing ring 1 is sleeved on the outer side of the middle pressure head, and a sealing ring 2 is sleeved on the outer side of the inner pressure head.

[0010] Furthermore, a hydraulic chamber three is provided inside the external pressure groove, the middle top column is sealingly and slidingly connected in the hydraulic chamber three, a threaded connection groove is provided at the bottom of the hydraulic chamber three, the inner thread of the threaded connection groove is threadedly connected to a base, a lower hydraulic hole is provided inside the base, and an electromagnetic valve three is installed at the bottom of the lower hydraulic hole.

[0011] Furthermore, a hydraulic chamber four is provided inside the middle top column, and the inner top column is sealingly and slidably connected in the hydraulic chamber four. The bottom of the hydraulic chamber four is threadedly connected with a threaded bottom plug, and a lower hydraulic inner tube is penetrated through the inside of the threaded bottom plug. A solenoid valve four is fixedly installed on the bottom of the base, and the solenoid valve four is connected to the lower hydraulic inner tube. A lower receiving groove is provided at the bottom of the threaded bottom plug, and the lower hydraulic inner tube can be received in the lower receiving groove.

[0012] Furthermore, a positioning groove 1 is provided inside the hydraulic chamber 3, a positioning ring 1 is provided on the outer side of the middle top column, and the positioning ring 1 is sealingly and slidably connected in the positioning groove 1. When the positioning ring 1 rises to the top inside the positioning groove 1, the top surface of the middle top column is flush with the inner bottom surface of the outer pressure groove, and a sealing ring 3 is sleeved on the outer side of the positioning ring 1. A positioning groove 2 is provided inside the hydraulic chamber 4, and a positioning ring 2 is provided on the outer side of the inner top column. The positioning ring 2 is sealingly and slidably connected in the positioning groove 2. When the positioning ring 2 rises to the top inside the positioning groove 2, the top surface of the inner top column is flush with the top surface of the middle top column, and a sealing ring 4 is sleeved on the outer side of the positioning ring 2.

[0013] Furthermore, a hydraulic control system is arranged inside the chassis, and solenoid valve one, solenoid valve two, solenoid valve three and solenoid valve four are all connected to the hydraulic control system through hydraulic pipes, and a control panel is fixedly installed on the front of the hydraulic telescopic assembly, and the control panel is used to control the hydraulic control system and the hydraulic telescopic assembly, and pipe holes are opened through the outer sides of the connecting piece and the base, and the hydraulic pipes pass through the pipe holes.

[0014] A non-cutting sample preparation method for a material slice sample comprises the following steps: S1. Take a small sample that has been crushed by jaw crusher, and then put it into a vibration mill to process the sample into powder; S2, pour the ground sample into the lower die assembly, and then use a scraper to flatten the sample along the top surface of the outer die; S3, start the equipment, the upper die assembly cooperates with the lower die assembly to perform step-by-step tabletting on the sample, the tabletting thickness decreases from bottom to top, and the tabletting pressure increases; S4. After the tableting is completed, the middle press head will push out the formed sample.

[0015] The beneficial effects of the present invention are as follows: The present invention adopts the design of an inverted cone stepped lower pressing die assembly, so that when the powder is laid in the lower pressing die assembly, the effect of large amount in the middle can be maintained, and at the same time, only the top of the powder needs to be scraped flat, the powder amount control accuracy is high, and the tableting sample quality is high.

[0016] The invention adopts the design of the inverted cone stepped upper pressing die assembly and the lower pressing die assembly, so that the device can be suitable for tableting and sampling of different amounts of powder without changing the die, has a wide application range and high tableting and sampling efficiency.

[0017] The present invention performs preliminary pressing on the powder by the inner pressure head and the inner top column at first, and the pressing compaction is relatively low; then the inner top column rises to be flush with the middle top column; the middle pressure head cooperates with the middle top column to perform secondary pressing, and the pressing compaction is increased; finally, the middle pressure head is flush with the inner bottom of the outer pressure groove; the outer pressure head cooperates with the outer pressure groove to perform the final pressing, and the powder is pressed into thin slices that meet the requirements; by adopting a stepped and segmented pressing method, the pressing force and area are gradually increased, and the pressure can be applied more evenly, thus avoiding the difference in thin slice density caused by uneven pressure distribution during a single high-pressure pressing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic cross-sectional view of the upper die assembly and the lower die assembly of the present invention; Figure 3 is an exploded view of the upper die assembly of the present invention; Figure 4 The present invention Figure 3 Schematic diagram of the cross-section structure; Figure 5 is an exploded view of the lower die assembly of the present invention; Figure 6 The present invention Figure 5 Schematic diagram of the cross-section structure; Figure 7 It is a schematic diagram of the tableting sample preparation process of the present invention.

[0019] Reference numerals: 1, chassis; 2, hydraulic telescopic assembly; 3, upper die assembly; 31, connector; 311, pipe hole; 32, outer pressure head; 321, spring groove; 322, upper storage groove; 33, intermediate pressure head; 331, sealing ring 1; 34, tension spring 1; 35, inner pressure head; 351, sealing ring 2; 36, tension spring 2; 37, upper hydraulic hole; 38, solenoid valve 1; 39, upper hydraulic inner tube; 310, solenoid valve 2; 4, lower die assembly; 4 1. External pressure die; 411. Positioning groove one; 412. Threaded connection groove; 42. External pressure groove; 43. Base; 44. Middle top column; 441. Positioning ring one; 442. Sealing ring three; 443. Positioning groove two; 45. Internal top column; 451. Positioning ring two; 452. Sealing ring four; 46. Threaded bottom plug; 461. Lower storage groove; 47. Solenoid valve three; 48. Lower hydraulic hole; 49. Solenoid valve four; 410. Lower hydraulic inner tube; 5. Control panel. DETAILED DESCRIPTION

[0020] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0021] Embodiment 1, as Figure 1-Figure 7 As shown, a non-cutting sample preparation device for a material sheet sample comprises a base frame 1, a hydraulic telescopic assembly 2 is arranged on the top of the base frame 1, an upper die assembly 3 is fixedly installed at the bottom of the telescopic end of the hydraulic telescopic assembly 2, and a lower die assembly 4 is fixedly installed on the top of the base frame 1; The upper die assembly 3 includes a connecting member 31, which is fixedly mounted on the telescopic end of the hydraulic telescopic assembly 2, an outer pressure head 32 is fixedly mounted on the bottom of the connecting member 31, a telescopic intermediate pressure head 33 is arranged inside the outer pressure head 32, and a telescopic inner pressure head 35 is arranged inside the intermediate pressure head 33; The lower die assembly 4 includes an outer die 41, which is mounted on the base frame 1. An outer die 41 has an outer die groove 42 at its top, a retractable middle top column 44 is disposed inside the outer die groove 42, and a retractable inner top column 45 is disposed inside the middle top column 44.

[0022] When in use, pour the sample powder into the lower die assembly 4. At this time, the internal space of the lower die assembly 4 is in the shape of an inverted cone. Therefore, when the powder is scraped flat along the top surface of the outer die 41, the powder is distributed in an inverted cone shape, with more powder in the middle, which can ensure uniform subsequent powder tableting and thus accurately control the amount of powder added.

[0023] After the powder is added, the equipment is started, and the hydraulic telescopic component 2 drives the upper die assembly 3 to descend. The inner pressure head 35 is first inserted into the interior of the intermediate top column 44 and cooperates with the inner top column 45 to perform preliminary compression of the powder. At this time, the pressure is relatively small, and the thickness of the pressed powder tablet is relatively large. It should be noted that at this time, the intermediate pressure head 33 and the outer pressure head 32 are both higher than the outer die 41. After the preliminary tableting is completed, the inner pressure head 35 and the inner top column 45 move upward at the same time. When the top surface of the inner top column 45 is flush with the top surface of the intermediate top column 44, the inner top column 45 stops moving upward, and the inner pressure head 35 continues to move upward. When the bottom surface of the inner pressure head 35 is flush with the bottom surface of the intermediate pressure head 33, the inner pressure head 35 stops moving upward, and then the upper die assembly 3 is controlled to continue to descend, and the intermediate pressure head 33 is inserted. The interior of the outer die 41 cooperates with the middle push column 44 to perform secondary compression on the powder. At this time, the pressure is greater than the initial compression pressure. The thickness of the pressed powder tablet is reduced, but it has not yet reached the requirement. It should be noted that at this time, the outer die 32 is higher than the outer die 41. After the secondary compression is completed, the middle die 33 and the middle push column 44 move upward at the same time, and the above steps are repeated. When the bottom surface of the middle die 33 is flush with the bottom surface of the outer die 32, and the top surface of the middle push column 44 is flush with the inner bottom surface of the outer compression groove 42, then the upper die assembly 3 is controlled to continue to descend, and the outer die 32 is inserted into the outer compression groove 42 for final compression to complete the tableting of the powder sample. After the tableting is completed, the middle push column 44 rises to push out the thin sheet, and the sample preparation efficiency is high. For the specific process, please refer to the attached Figure 7 .

[0024] The internal space of the lower die assembly 4 of the present invention is in a conical stepped shape, so it can be suitable for pressing different amounts of powder. When the amount of powder is medium, two pressings are sufficient. When the amount of powder is trace, there is no need for segmented pressing. The internal pressure head 35 and the internal top column 45 can be directly used in combination to directly complete the pressing of trace powders, which has a wide range of applications.

[0025] The present invention adopts a step-by-step pressing method, and the pressing force and area gradually increase, so that pressure can be applied more evenly, avoiding the difference in slice density caused by uneven pressure distribution in a single high-pressure pressing process.

[0026] Embodiment 2, on the basis of the above embodiment, further includes: a hydraulic chamber 1 is opened inside the external pressure head 32, the intermediate pressure head 33 is sealingly and slidably connected in the hydraulic chamber 1, a tension spring 1 34 is arranged between the top of the intermediate pressure head 33 and the top of the hydraulic chamber 1, an upper hydraulic hole 37 is opened on the top of the external pressure head 32, the upper hydraulic hole 37 is connected with the hydraulic chamber 1, and a solenoid valve 1 38 is arranged on the top of the upper hydraulic hole 37.

[0027] Furthermore, a hydraulic chamber 2 is opened inside the middle pressure head 33, the inner pressure head 35 is sealingly and slidably connected in the hydraulic chamber 2, a tension spring 2 36 is arranged between the top of the inner pressure head 35 and the top of the hydraulic chamber 2, and a solenoid valve 2 310 is fixedly installed on the top of the outer pressure head 32, and the solenoid valve 2 310 is connected to the hydraulic chamber 2 through the upper hydraulic inner tube 39.

[0028] During the initial pressing, hydraulic oil is completely injected into the hydraulic chamber 1 and the hydraulic chamber 2. After the initial pressing is completed, the control solenoid valve 2 310 is opened, and the hydraulic oil in the hydraulic chamber 2 is discharged through the upper hydraulic inner tube 39 and the solenoid valve 2 310, and the tension spring 2 36 drives the inner pressure head 35 to retract into the hydraulic chamber 2. It should be noted that when the inner pressure head 35 is fully retracted, the bottom surface of the inner pressure head 35 is flush with the bottom surface of the intermediate pressure head 33, and the inner pressure head 35 and the intermediate pressure head 33 form a whole for secondary pressing. After the secondary pressing is completed, the solenoid valve 1 38 is opened, and the hydraulic oil in the hydraulic chamber 1 is discharged through the upper hydraulic hole 37 and the solenoid valve 1 38, and the tension spring 1 34 drives the intermediate pressure head 33 to retract into the hydraulic chamber 1. It should be noted that when the intermediate pressure head 33 is fully retracted into the hydraulic chamber 1, the bottom surface of the intermediate pressure head 33 is flush with the bottom surface of the outer pressure head 32, and the inner pressure head 35, the intermediate pressure head 33 and the outer pressure head 32 form a whole for final pressing. It is controlled by hydraulic pressure, has a simple structure, and is stable in operation.

[0029] Embodiment three, based on the above embodiment, further includes that the inner tops of hydraulic chamber one and hydraulic chamber two are both provided with spring grooves 321, the inner top of hydraulic chamber one is provided with an upper receiving groove 322, the upper receiving groove 322 is located in the middle of the spring groove 321, and the upper hydraulic inner tube 39 can be received in the upper receiving groove 322.

[0030] The spring groove 321 can accommodate the tension spring 1 34 and the tension spring 2 36, so that when the inner pressure head 35 is fully retracted, the inner pressure head 35 is in rigid contact with the top of the hydraulic chamber 2, and when the intermediate pressure head 33 is fully retracted, the intermediate pressure head 33 is in rigid contact with the top of the hydraulic chamber 1, so the pressing is stable.

[0031] Furthermore, a sealing ring 1 331 is sleeved on the outer side of the middle pressure head 33 , and a sealing ring 2 351 is sleeved on the outer side of the inner pressure head 35 .

[0032] By setting the sealing ring 1 331, the sliding sealing performance between the intermediate pressure head 33 and the hydraulic chamber 1 can be improved, and by setting the sealing ring 2 351, the sliding sealing performance between the internal pressure head 35 and the hydraulic chamber 2 can be improved.

[0033] Embodiment 4, on the basis of the above embodiment, further includes: a hydraulic chamber 3 is opened inside the external pressure groove 42, the middle top column 44 is sealingly and slidably connected in the hydraulic chamber 3, a threaded connection groove 412 is opened at the bottom of the hydraulic chamber 3, the threaded connection groove 412 is internally threadedly connected to the base 43, a lower hydraulic hole 48 is opened inside the base 43, and a solenoid valve 3 47 is installed at the bottom of the lower hydraulic hole 48.

[0034] Furthermore, a hydraulic chamber four is opened inside the middle top column 44, and the inner top column 45 is sealingly and slidably connected in the hydraulic chamber four. The bottom of the hydraulic chamber four is threadedly connected with a threaded bottom plug 46, and a lower hydraulic inner tube 410 is penetrated inside the threaded bottom plug 46. A solenoid valve four 49 is fixedly installed on the bottom of the base 43, and the solenoid valve four 49 is connected to the lower hydraulic inner tube 410. A lower receiving groove 461 is opened at the bottom of the threaded bottom plug 46, and the lower hydraulic inner tube 410 can be received in the lower receiving groove 461.

[0035] Before pressing, a small amount of hydraulic oil is filled into the hydraulic chamber three and the hydraulic chamber four to control the step height of the inner top column 45 and the middle top column 44 to adjust the powder storage space so that the lower die assembly 4 can be suitable for pressing different types of powders. After the initial pressing is completed, the solenoid valve four 49 is opened, and the hydraulic oil is injected into the hydraulic chamber four through the solenoid valve four 49 and the lower hydraulic inner tube 410. The hydraulic oil pushes the inner top column 45 to rise. When the top surface of the inner top column 45 is flush with the top surface of the middle top column 44, the solenoid valve four 49 is closed, and the solenoid valve two 310 is controlled to open at the same time. The hydraulic oil in the hydraulic chamber two is discharged through the upper hydraulic inner tube 39 and the solenoid valve two 310, and the tension spring two 36 drives the inner pressure head 35 to retract into the hydraulic chamber two; After the secondary pressing is completed, the solenoid valve three 47 is opened, and the hydraulic oil is injected into the hydraulic chamber three through the lower hydraulic hole 48. The hydraulic oil pushes the middle top column 44 to rise. When the top surface of the middle top column 44 is flush with the inner bottom surface of the outer pressure groove 42, the solenoid valve three 47 is closed, and the solenoid valve one 38 is opened at the same time. The hydraulic oil in the hydraulic chamber one is discharged through the upper hydraulic hole 37 and the solenoid valve one 38, and the tension spring one 34 drives the middle pressure head 33 to retract into the hydraulic chamber one. At this time, the device can perform the final pressing, and the control is simple.

[0036] Embodiment 5, on the basis of the above embodiment, further includes: a positioning groove 411 is opened inside the hydraulic chamber 3, a positioning ring 441 is arranged on the outer side of the middle top column 44, the positioning ring 441 is sealingly slidably connected in the positioning groove 411, when the positioning ring 441 rises to the top inside the positioning groove 411, the top surface of the middle top column 44 is flush with the inner bottom surface of the external pressure groove 42, and the outer side of the positioning ring 441 is sleeved with a sealing ring 3 442, a positioning groove 443 is opened inside the hydraulic chamber 4, a positioning ring 451 is arranged on the outer side of the inner top column 45, the positioning ring 451 is sealingly slidably connected in the positioning groove 443, when the positioning ring 451 rises to the top inside the positioning groove 443, the top surface of the inner top column 45 is flush with the top surface of the middle top column 44, and the outer side of the positioning ring 451 is sleeved with a sealing ring 452.

[0037] By setting the positioning groove 1 411 and the positioning ring 1 441, the rising position of the middle top column 44 can be limited. When the positioning ring 1 441 rises to the top of the positioning groove 1 411, the top surface of the middle top column 44 is flush with the inner bottom surface of the external pressure groove 42. At this time, hydraulic oil cannot be injected, and the solenoid valve 3 47 can be closed; by setting the positioning groove 2 443 and the positioning ring 2 451, the rising position of the inner top column 45 can be limited. When the positioning ring 2 451 rises to the top of the positioning groove 2 443, the top surface of the inner top column 45 is flush with the top surface of the middle top column 44. At this time, hydraulic oil cannot be injected, and the solenoid valve 4 49 can be closed, which makes the control simpler.

[0038] Embodiment 6, on the basis of the above embodiments, further includes: a hydraulic control system is arranged inside the base frame 1, solenoid valve 1 38, solenoid valve 2 310, solenoid valve 3 47 and solenoid valve 4 49 are all connected with the hydraulic control system through hydraulic pipes, a control panel 5 is fixedly installed on the front of the hydraulic telescopic assembly 2, the control panel 5 is used to control the hydraulic control system and the hydraulic telescopic assembly 2, and pipe holes 311 are opened through the outer sides of the connecting piece 31 and the base 43, and the hydraulic pipe passes through the pipe hole 311.

[0039] By setting the control panel 5, the pressure of the hydraulic telescopic assembly 2 at each stage can be controlled, and the initial space of the lower die assembly 4 can be controlled through the hydraulic system, which is convenient for control.

[0040] Embodiment 7, a non-cutting sample preparation method of a material slice sample, comprising the following steps: S1. Take a small sample that has been crushed by jaw crusher, and then put it into a vibration mill to process the sample into powder; S2, pour the ground sample into the lower die assembly 4, and then use a scraper to flatten the sample along the top surface of the outer die 41; S3, start the equipment, the upper die assembly 3 and the lower die assembly 4 cooperate to perform step-by-step tabletting on the sample, the tabletting thickness decreases from bottom to top, and the tabletting pressure increases; S4. After the tabletting is completed, the intermediate pressing head 33 ejects the formed sample.

[0041] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A non-cutting sample preparation device for a material sheet sample, comprising a base frame (1), characterized in that: A hydraulic telescopic assembly (2) is arranged on the top of the base frame (1); an upper die assembly (3) is fixedly mounted on the bottom of the telescopic end of the hydraulic telescopic assembly (2); and a lower die assembly (4) is fixedly mounted on the top of the base frame (1); The upper die assembly (3) comprises a connecting piece (31), the connecting piece (31) being fixedly mounted on the telescopic end of the hydraulic telescopic assembly (2), an external pressure head (32) being fixedly mounted on the bottom of the connecting piece (31), a telescopic intermediate pressure head (33) being arranged inside the external pressure head (32), and a telescopic inner pressure head (35) being arranged inside the intermediate pressure head (33); The lower die assembly (4) comprises an outer die (41), the outer die (41) being mounted on the bottom frame (1), an outer die groove (42) being formed on the top of the outer die (41), a retractable middle top column (44) being arranged inside the outer die groove (42), and a retractable inner top column (45) being arranged inside the middle top column (44).

2. A non-cutting sample preparation device for a material sheet sample according to claim 1, characterized in that: A hydraulic chamber 1 is provided inside the external pressure head (32), the intermediate pressure head (33) is sealingly and slidably connected in the hydraulic chamber 1, a tension spring 1 (34) is provided between the top of the intermediate pressure head (33) and the top of the hydraulic chamber 1, an upper hydraulic hole (37) is provided on the top of the external pressure head (32), the upper hydraulic hole (37) is connected to the hydraulic chamber 1, and a solenoid valve 1 (38) is provided on the top of the upper hydraulic hole (37).

3. A non-cutting sample preparation device for a material sheet sample according to claim 2, characterized in that: A second hydraulic chamber is provided inside the intermediate pressure head (33), an inner pressure head (35) is sealingly and slidably connected in the second hydraulic chamber, a second tension spring (36) is provided between the top of the inner pressure head (35) and the top of the second hydraulic chamber, and a second solenoid valve (310) is fixedly installed on the top of the outer pressure head (32), and the second solenoid valve (310) is connected to the second hydraulic chamber via an upper hydraulic inner tube (39).

4. A non-cutting sample preparation device for a material sheet sample according to claim 3, characterized in that: The inner tops of the hydraulic chamber 1 and the hydraulic chamber 2 are both provided with spring grooves (321), and the inner top of the hydraulic chamber 1 is provided with an upper receiving groove (322), the upper receiving groove (322) is located in the middle of the spring groove (321), and the upper hydraulic inner tube (39) can be received in the upper receiving groove (322).

5. A non-cutting sample preparation device for a material sheet sample according to claim 4, characterized in that: The outer side of the middle pressure head (33) is sleeved with a sealing ring 1 (331), and the outer side of the inner pressure head (35) is sleeved with a sealing ring 2 (351).

6. A non-cutting sample preparation device for a material sheet sample according to claim 5, characterized in that: A hydraulic chamber three is provided inside the external pressure groove (42), the middle top column (44) is sealingly and slidably connected in the hydraulic chamber three, a threaded connection groove (412) is provided at the bottom of the hydraulic chamber three, the threaded connection groove (412) is internally threadedly connected to a base (43), a lower hydraulic hole (48) is provided inside the base (43), and a solenoid valve three (47) is installed at the bottom of the lower hydraulic hole (48).

7. A non-cutting sample preparation device for a material sheet sample according to claim 6, characterized in that: A hydraulic chamber four is provided inside the middle top column (44), and an inner top column (45) is sealingly and slidably connected in the hydraulic chamber four. A threaded bottom plug (46) is threadedly connected to the bottom of the hydraulic chamber four, and a lower hydraulic inner tube (410) is provided through the inside of the threaded bottom plug (46). A solenoid valve four (49) is fixedly installed at the bottom of the base (43), and the solenoid valve four (49) is connected to the lower hydraulic inner tube (410). A lower receiving groove (461) is provided at the bottom of the threaded bottom plug (46), and the lower hydraulic inner tube (410) can be received in the lower receiving groove (461).

8. A non-cutting sample preparation device for a material sheet sample according to claim 7, characterized in that: A positioning groove (411) is provided inside the hydraulic chamber (3), and a positioning ring (441) is provided on the outer side of the intermediate top column (44). The positioning ring (441) is sealingly and slidably connected in the positioning groove (411). When the positioning ring (441) rises to the top of the positioning groove (411), the top surface of the intermediate top column (44) is flush with the inner bottom surface of the external pressure groove (42). The outer side of the positioning ring (441) is sleeved with a sealing ring (442). A second positioning groove (443) is provided inside the hydraulic chamber (4), and a second positioning ring (451) is provided on the outer side of the inner top column (45). The second positioning ring (451) is sealingly and slidably connected in the second positioning groove (443). When the second positioning ring (451) rises to the top of the second positioning groove (443), the top surface of the inner top column (45) is flush with the top surface of the middle top column (44). A fourth sealing ring (452) is sleeved on the outer side of the second positioning ring (451).

9. A non-cutting sample preparation device for a material sheet sample according to claim 8, characterized in that: A hydraulic control system is arranged inside the base frame (1); solenoid valve 1 (38), solenoid valve 2 (310), solenoid valve 3 (47) and solenoid valve 4 (49) are all connected to the hydraulic control system via hydraulic pipes; a control panel (5) is fixedly mounted on the front of the hydraulic telescopic assembly (2); the control panel (5) is used to control the hydraulic control system and the hydraulic telescopic assembly (2); and pipe holes (311) are formed through the outer sides of the connecting piece (31) and the base (43); the hydraulic pipes pass through the pipe holes (311).

10. A non-cutting sample preparation method for a material sheet sample, using a non-cutting sample preparation device for a material sheet sample as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Take a small sample that has been crushed by jaw crusher, and then put it into a vibration mill to process the sample into powder; S2, pouring the ground sample into the lower die assembly (4), and then using a scraper to flatten the sample along the top surface of the outer die (41); S3, starting the equipment, the upper die assembly (3) and the lower die assembly (4) cooperate to perform step-by-step tabletting on the sample, the tabletting thickness decreases from bottom to top, and the tabletting pressure increases; S4. After the tabletting is completed, the intermediate pressing head (33) ejects the formed sample.

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