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

Abstract

The present invention discloses a non-cutting sample preparation device and method for a thin material sheet sample, which relates to the technical field of powder tablet pressing sample preparation. The present invention includes a chassis, on the top of which a hydraulic telescopic assembly is arranged, and at the bottom of the telescopic end of the hydraulic telescopic assembly, an upper pressing die assembly is fixedly installed, and a lower pressing die assembly is fixedly installed on the top of the chassis. By adopting the design of an inverted conical stepped lower pressing die assembly, when the powder is laid in the lower pressing die assembly, the effect of a large amount in the middle can be maintained. At the same time, it only needs to scrape the top of the powder flat, with high precision in powder amount control and high quality in tablet pressing sample preparation. The device can be applied to powder tablet pressing sample preparation of different amounts without changing the die, with high efficiency in tablet pressing sample preparation. At the same time, by adopting the stepped segmented pressing method, the pressing force gradually increases, and the pressure can be applied more evenly, avoiding the density difference of the thin sheet caused by uneven pressure distribution during the single high-pressure pressing process.

Description

Technical Field

[0001] The present invention relates to the technical field of powder tablet sample preparation, and particularly relates to a non-cutting sample preparation device and method for thin material samples. Background Art

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

[0003] The sample preparation steps of powder tablet sample preparation are as follows: after the sample is broken, it is dried, processed to a certain particle size by a grinding device, and finally pressed into a stable round tablet by a tablet pressing device. During the tablet pressing operation, the powder needs to be put into the tablet pressing mold and made slightly higher in the middle to make the tablet pressing uniform. This makes it difficult to accurately control the powder addition amount during the actual operation process, affecting the forming quality of the thin slice; at the same time, when the powder amount is small, due to the fixed size of the mold, the pressed thin slice is too thin to obtain a qualified sample. In a Chinese patent (publication number: CN117388022A), a concentric circle tablet press for micro-sample preparation is disclosed. Since the base of this tablet press can be disassembled, the base can be replaced, and the sizes of the inner circle cut and outer circle cut of different bases can be inconsistent with each other; moreover, the concentric circle punch tool and the first tool body and the second tool body it contains can all 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 the material to be cut with different thicknesses, concentric circle tablets with different thicknesses can be cut out. In this way, concentric circle tablets with different sizes and different thicknesses can be cut out. This patent mainly realizes the pressing of different round tablet samples by replacing the pressing head and the mold, which affects the efficiency of tablet sample preparation. At the same time, in this patent, the concentric circle paper sheet is first placed on the tablet pressing mold, and then the mixture of the sample and potassium bromide is put into the middle hole. The pressed transparent thin slice adheres to the center of the round paper sheet. Similar to the prior art, the powder is directly added into the tablet pressing mold, and the powder addition amount cannot be accurately controlled, and the pressing of trace powder needs to be realized by means of concentric circle paper sheets. Summary of the Invention

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

[0005] The present invention specifically adopts the following technical solutions to achieve the above purpose:

[0006] A non-cutting sample preparation device for a thin material sheet sample, comprising a chassis, a hydraulic telescopic component is arranged on the top of the chassis, an upper pressing die component is fixedly installed at the bottom of the telescopic end of the hydraulic telescopic component, and a lower pressing die component is fixedly installed on the top of the chassis;

[0007] The upper pressing die component includes a connecting piece, the connecting piece is fixedly installed at the telescopic end of the hydraulic telescopic component, an outer pressing head is fixedly installed at the bottom of the connecting piece, a telescopic intermediate pressing head is arranged inside the outer pressing head, and a telescopic inner pressing head is arranged inside the intermediate pressing head;

[0008] The lower pressing die component includes an outer pressing die, the outer pressing die is installed on the chassis, an outer pressing groove is formed at the top of the outer pressing die, a telescopic intermediate ejector rod is arranged inside the outer pressing groove, and a telescopic inner ejector rod is arranged inside the intermediate ejector rod.

[0009] Further, a hydraulic cavity one is formed inside the outer pressing head, the intermediate pressing head is hermetically and slidably connected in the hydraulic cavity one, a first tension spring is arranged between the top of the intermediate pressing head and the inner top of the hydraulic cavity one, an upper hydraulic hole is formed at the top of the outer pressing head, the upper hydraulic hole is communicated with the hydraulic cavity one, and a first solenoid valve is arranged at the top of the upper hydraulic hole.

[0010] Further, a hydraulic cavity two is formed inside the intermediate pressing head, the inner pressing head is hermetically and slidably connected in the hydraulic cavity two, a second tension spring is arranged between the top of the inner pressing head and the inner top of the hydraulic cavity two, a second solenoid valve is fixedly installed at the top of the outer pressing head, and the second solenoid valve is communicated with the hydraulic cavity two through an upper hydraulic inner pipe.

[0011] Further, spring grooves are formed at the inner tops of both the hydraulic cavity one and the hydraulic cavity two, an upper storage groove is formed at the inner top of the hydraulic cavity one, the upper storage groove is located in the middle of the spring groove, and the upper hydraulic inner pipe can be stored in the upper storage groove.

[0012] Further, a first sealing ring is sleeved outside the intermediate pressing head, and a second sealing ring is sleeved outside the inner pressing head.

[0013] Further, a hydraulic cavity three is formed inside the outer pressing groove, the intermediate ejector rod is hermetically and slidably connected in the hydraulic cavity three, a threaded connection groove is formed at the bottom of the hydraulic cavity three, a base is threadedly connected inside the threaded connection groove, a lower hydraulic hole penetrates through the base, and a third solenoid valve is installed at the bottom of the lower hydraulic hole.

[0014] Further, a hydraulic cavity four is provided inside the intermediate top column, the inner top column is hermetically and slidably connected in the hydraulic cavity four, a threaded bottom plug is threadedly connected to the bottom of the hydraulic cavity four, a lower hydraulic inner pipe is disposed through the inside of the threaded bottom plug, a solenoid valve four is fixedly installed at the bottom of the base, the solenoid valve four is communicated with the lower hydraulic inner pipe, a lower receiving groove is provided at the bottom of the threaded bottom plug, and the lower hydraulic inner pipe can be received in the lower receiving groove.

[0015] Further, a positioning groove one is provided inside the hydraulic cavity three, a positioning ring one is provided on the outer side of the intermediate top column, the positioning ring one is hermetically and slidably connected in the positioning groove one, when the positioning ring one rises to the inner top of the positioning groove one, the top surface of the intermediate top column is flush with the inner bottom surface of the outer pressure groove, a sealing ring three is sleeved on the outer side of the positioning ring one, a positioning groove two is provided inside the hydraulic cavity four, a positioning ring two is provided on the outer side of the inner top column, the positioning ring two is hermetically and slidably connected in the positioning groove two, when the positioning ring two rises to the inner top of the positioning groove two, the top surface of the inner top column is flush with the top surface of the intermediate top column, and a sealing ring four is sleeved on the outer side of the positioning ring two.

[0016] Further, a hydraulic control system is provided inside the chassis, the solenoid valve one, the solenoid valve two, the solenoid valve three and the solenoid valve four are all communicated with the hydraulic control system through hydraulic pipes, a control panel is fixedly installed on the front surface of the hydraulic telescopic assembly, the control panel is used to control the hydraulic control system and the hydraulic telescopic assembly, and through holes are provided through the outer sides of the connecting member and the base, and the hydraulic pipes pass through the through holes.

[0017] A non-cutting sample preparation method for a material thin sheet sample includes the following steps:

[0018] S1. Take small pieces of the sample that have been crushed by a jaw crusher, and then put them into a vibration mill to process the sample into powder;

[0019] S2. Pour the ground sample into the lower pressing die assembly, and then use a scraper to scrape the sample flat along the top surface of the outer pressing die;

[0020] S3. Start the equipment, and the upper pressing die assembly and the lower pressing die assembly cooperate to perform stepped segmented pressing on the sample, the pressing thickness decreases sequentially from bottom to top, and the pressing pressure increases sequentially;

[0021] S4. After the pressing is completed, the intermediate punch pushes out the formed sample.

[0022] The beneficial effects of the present invention are as follows:

[0023] By adopting the design of the inverted conical stepped lower pressing die assembly, the present invention enables the powder to maintain the effect of a large amount in the middle when being laid in the lower pressing die assembly, and at the same time, it is only necessary to scrape the top of the powder flat, the powder amount control accuracy is high, and the pressing sample preparation quality is high.

[0024] By adopting the design of an inverted conical stepped upper pressing die assembly and a lower pressing die assembly, the device of the present invention can be applied to powder tablet pressing sample preparation with different amounts, without the need to replace the die, has a wide application range, and high efficiency in tablet pressing sample preparation.

[0025] In the present invention, the inner pressing head and the inner ejector post first perform preliminary pressing on the powder with a relatively low pressing compactness. Then, the inner ejector post rises to be flush with the middle ejector post, and the middle pressing head and the middle ejector post cooperate to perform secondary pressing, increasing the pressing compactness. Finally, the middle pressing head is flush with the bottom of the outer pressing groove, and the outer pressing head and the outer pressing groove cooperate to perform the final pressing, pressing the powder into a thin sheet that meets the requirements. By adopting the stepped segmented pressing method, the pressing force and area gradually increase, and the pressure can be applied more evenly, avoiding the density difference of the thin sheet caused by uneven pressure distribution during the single high-pressure pressing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 is a schematic cross-sectional structure diagram of the upper pressing die assembly and the lower pressing die assembly of the present invention;

[0028] Figure 3 is an exploded view of the upper pressing die assembly of the present invention;

[0029] Figure 4 is the present invention Figure 3 schematic cross-sectional structure diagram;

[0030] Figure 5 is an exploded view of the lower pressing die assembly of the present invention;

[0031] Figure 6 is the present invention Figure 5 schematic cross-sectional structure diagram;

[0032] Figure 7 is a schematic diagram of the tablet pressing sample preparation process of the present invention.

[0033] Reference numerals: 1, chassis; 2, hydraulic telescopic component; 3, upper pressing die component; 31, connecting piece; 311, pipe hole; 32, outer pressing head; 321, spring groove; 322, upper receiving groove; 33, intermediate pressing head; 331, sealing ring I; 34, tension spring I; 35, inner pressing head; 351, sealing ring II; 36, tension spring II; 37, upper hydraulic hole; 38, solenoid valve I; 39, upper hydraulic inner pipe; 310, solenoid valve II; 4, lower pressing die component; 41, outer pressing die; 411, positioning groove I; 412, threaded connection groove; 42, outer pressing groove; 43, base; 44, intermediate ejector pin; 441, positioning ring I; 442, sealing ring III; 443, positioning groove II; 45, inner ejector pin; 451, positioning ring II; 452, sealing ring IV; 46, threaded bottom plug; 461, lower receiving groove; 47, solenoid valve III; 48, lower hydraulic hole; 49, solenoid valve IV; 410, lower hydraulic inner pipe; 5, control panel. Detailed implementation manners

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0035] Embodiment 1, as Figures 1-7 shown, a non-cutting sample preparation device for a material thin sheet sample includes a chassis 1, a hydraulic telescopic component 2 is arranged on the top of the chassis 1, the bottom of the telescopic end of the hydraulic telescopic component 2 is fixedly installed with an upper pressing die component 3, and a lower pressing die component 4 is fixedly installed on the top of the chassis 1;

[0036] The upper pressing die component 3 includes a connecting piece 31, the connecting piece 31 is fixedly installed at the telescopic end of the hydraulic telescopic component 2, the bottom of the connecting piece 31 is fixedly installed with an outer pressing head 32, an intermediate pressing head 33 capable of telescoping is arranged inside the outer pressing head 32, and an inner pressing head 35 capable of telescoping is arranged inside the intermediate pressing head 33;

[0037] The lower pressing die component 4 includes an outer pressing die 41, the outer pressing die 41 is installed on the chassis 1, an outer pressing groove 42 is formed in the top of the outer pressing die 41, an intermediate ejector pin 44 capable of telescoping is arranged inside the outer pressing groove 42, and an inner ejector pin 45 capable of telescoping is arranged inside the intermediate ejector pin 44.

[0038] During use, the sample powder is poured into the lower pressing die component 4. At this time, the internal space of the lower pressing die component 4 is in an inverted conical stepped shape. Therefore, when the powder is scraped flat along the top surface of the outer pressing die 41, the powder is distributed in an inverted conical shape, and the amount of powder in the middle is large, which can ensure the uniformity of subsequent powder tablet pressing and further accurately control the powder addition amount.

[0039] After the powder is added, start the equipment. The hydraulic telescopic component 2 drives the upper pressing die component 3 to descend. The inner pressing head 35 first inserts into the interior of the intermediate ejector pin 44 and cooperates with the inner ejector pin 45 to initially press 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, both the intermediate pressing head 33 and the outer pressing head 32 are higher than the outer pressing die 41. After the initial tablet pressing is completed, the inner pressing head 35 and the inner ejector pin 45 move upward simultaneously. When the top surface of the inner ejector pin 45 is flush with the top surface of the intermediate ejector pin 44, the inner ejector pin 45 stops moving upward, and the inner pressing head 35 continues to move upward. When the bottom surface of the inner pressing head 35 is flush with the bottom surface of the intermediate pressing head 33, the inner pressing head 35 stops moving upward. Then, control the upper pressing die component 3 to continue descending. The intermediate pressing head 33 inserts into the interior of the outer pressing die 41 and cooperates with the intermediate ejector pin 44 to perform secondary pressing on the powder. At this time, the pressure is greater than the initial pressing pressure, and the thickness of the pressed powder tablet decreases, but it has not yet reached the requirement. It should be noted that at this time, the outer pressing head 32 is higher than the outer pressing die 41. After the secondary pressing is completed, the intermediate pressing head 33 and the intermediate ejector pin 44 move upward simultaneously. Repeat the above steps. When the bottom surface of the intermediate pressing head 33 is flush with the bottom surface of the outer pressing head 32, and the top surface of the intermediate ejector pin 44 is flush with the inner bottom surface of the outer pressing groove 42, then control the upper pressing die component 3 to continue descending. The outer pressing head 32 is inserted into the outer pressing groove 42 for final pressing to complete the tablet preparation of the powder sample. After the tablet pressing is completed, the intermediate ejector pin 44 rises to eject the thin sheet, and the sample preparation efficiency is high. For the specific process, please refer to the appendix Figure 7 .

[0040] In the present invention, the internal space of the lower pressing die component 4 is in a tapered stepped shape, so it can be applicable to the powder pressing of different amounts. When the amount of powder is medium, two presses can be adopted. When the amount of powder is very small, there is no need for segmented pressing. The inner pressing head 35 and the inner ejector pin 45 can be directly used in cooperation to directly complete the pressing of a very small amount of powder, and the scope of application is wide.

[0041] The present invention adopts a stepped segmented pressing method, and the pressing force and area gradually increase, which can apply pressure more evenly and avoid the density difference of the thin sheet caused by uneven pressure distribution during the single high-pressure pressing process.

[0042] Embodiment 2, on the basis of the above embodiment, further includes that a hydraulic chamber 1 is opened inside the outer pressing head 32. The intermediate pressing head 33 is hermetically and slidably connected in the hydraulic chamber 1. A first tension spring 34 is arranged between the top of the intermediate pressing head 33 and the inner top of the hydraulic chamber 1. An upper hydraulic hole 37 is opened at the top of the outer pressing head 32. The upper hydraulic hole 37 is connected to the hydraulic chamber 1. A first solenoid valve 38 is arranged at the top of the upper hydraulic hole 37.

[0043] Further, a second hydraulic cavity is provided inside the middle punch 33. The inner punch 35 is hermetically and slidably connected in the second hydraulic cavity. A second tension spring 36 is provided between the top of the inner punch 35 and the inner top of the second hydraulic cavity. A second solenoid valve 310 is fixedly installed at the top of the outer punch 32. The second solenoid valve 310 is connected to the second hydraulic cavity through an upper hydraulic inner pipe 39.

[0044] During the preliminary pressing, hydraulic oil is completely filled in both the first hydraulic cavity and the second hydraulic cavity. After the preliminary pressing is completed, the second solenoid valve 310 is controlled to open, and the hydraulic oil in the second hydraulic cavity is discharged through the upper hydraulic inner pipe 39 and the second solenoid valve 310. The second tension spring 36 drives the inner punch 35 to retract into the second hydraulic cavity. It should be noted that when the inner punch 35 is completely retracted, the bottom surface of the inner punch 35 is flush with the bottom surface of the middle punch 33. The inner punch 35 and the middle punch 33 form a whole for secondary pressing. After the secondary pressing is completed, the first solenoid valve 38 is opened, and the hydraulic oil in the first hydraulic cavity is discharged through the upper hydraulic hole 37 and the first solenoid valve 38. The first tension spring 34 drives the middle punch 33 to retract into the first hydraulic cavity. It should be noted that when the middle punch 33 is completely retracted into the first hydraulic cavity, the bottom surface of the middle punch 33 is flush with the bottom surface of the outer punch 32. The inner punch 35, the middle punch 33 and the outer punch 32 form a whole for final pressing. Through hydraulic control, the structure is simple and the operation is stable.

[0045] Embodiment 3. On the basis of the above embodiment, it further includes that spring grooves 321 are provided at the inner tops of both the first hydraulic cavity and the second hydraulic cavity. An upper storage groove 322 is provided at the inner top of the first hydraulic cavity. The upper storage groove 322 is located in the middle of the spring groove 321. The upper hydraulic inner pipe 39 can be stored in the upper storage groove 322.

[0046] Through the arrangement of the spring grooves 321, the first tension spring 34 and the second tension spring 36 can be stored, so that when the inner punch 35 is completely retracted, the inner punch 35 is in rigid contact with the inner top of the second hydraulic cavity, and when the middle punch 33 is completely retracted, the middle punch 33 is in rigid contact with the inner top of the first hydraulic cavity, and the pressing is stable.

[0047] Further, a first sealing ring 331 is sleeved outside the middle punch 33, and a second sealing ring 351 is sleeved outside the inner punch 35.

[0048] Through the arrangement of the first sealing ring 331, the sliding sealing performance between the middle punch 33 and the first hydraulic cavity can be improved. Through the arrangement of the second sealing ring 351, the sliding sealing performance between the inner punch 35 and the second hydraulic cavity can be improved.

[0049] Embodiment 4, based on the above embodiment, further includes: a hydraulic chamber three is opened inside the external pressure groove 42, the middle top column 44 is sealingly and slidingly connected in the hydraulic chamber three, a threaded connection groove 412 is opened at the bottom of the hydraulic chamber three, the threaded connection groove 412 is internally threadedly connected to the base 43, a lower hydraulic hole 48 is opened through the interior of the base 43, and a solenoid valve three 47 is installed at the bottom of the lower hydraulic hole 48.

[0050] Furthermore, a hydraulic chamber four is opened inside the middle top column 44, and the inner top column 45 is sealingly and slidingly connected to the hydraulic chamber four. The bottom of the hydraulic chamber four is threadedly connected to 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.

[0051] 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, so as to adjust the powder storage space and make the lower die assembly 4 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 up. 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.

[0052] 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.

[0053] Embodiment 5, on the basis of the above embodiment, further includes that a positioning groove 1 (411) is provided inside the hydraulic chamber 3, a positioning ring 1 (441) is provided on the outer side of the intermediate jack 44, the positioning ring 1 (441) is hermetically and slidably connected in the positioning groove 1 (411), when the positioning ring 1 (441) rises to the inner top of the positioning groove 1 (411), the top surface of the intermediate jack 44 is flush with the inner bottom surface of the outer pressure groove 42, a sealing ring 3 (442) is sleeved on the outer side of the positioning ring 1 (441), a positioning groove 2 (443) is provided inside the hydraulic chamber 4, a positioning ring 2 (451) is provided on the outer side of the inner jack 45, the positioning ring 2 (451) is hermetically and slidably connected in the positioning groove 2 (443), when the positioning ring 2 (451) rises to the inner top of the positioning groove 2 (443), the top surface of the inner jack 45 is flush with the top surface of the intermediate jack 44, and a sealing ring 4 (452) is sleeved on the outer side of the positioning ring 2 (451).

[0054] Through the arrangement of the positioning groove 1 (411) and the positioning ring 1 (441), the rising position of the intermediate jack 44 can be limited. When the positioning ring 1 (441) rises to the inner top of the positioning groove 1 (411), the top surface of the intermediate jack 44 is flush with the inner bottom surface of the outer pressure groove 42. At this time, no hydraulic oil can be injected, and the solenoid valve 3 (47) can be closed; through the arrangement of the positioning groove 2 (443) and the positioning ring 2 (451), the rising position of the inner jack 45 can be limited. When the positioning ring 2 (451) rises to the inner top of the positioning groove 2 (443), the top surface of the inner jack 45 is flush with the top surface of the intermediate jack 44. At this time, no hydraulic oil can be injected, and the solenoid valve 4 (49) can be closed, and the control is simpler.

[0055] Embodiment 6, on the basis of the above embodiment, further includes that a hydraulic control system is provided inside the chassis 1, the solenoid valve 1 (38), the solenoid valve 2 (310), the solenoid valve 3 (47) and the solenoid valve 4 (49) are all connected to the hydraulic control system through hydraulic pipes, a control panel 5 is fixedly installed on the front surface of the hydraulic telescopic assembly 2, and the control panel 5 is used to control the hydraulic control system and the hydraulic telescopic assembly 2. Through holes 311 are provided through the front surfaces of the connecting member 31 and the base 43, and the hydraulic pipes pass through the through holes 311.

[0056] Through the arrangement of the control panel 5, the pressure at each stage of the hydraulic telescopic assembly 2 can be controlled, and the initial space of the lower die assembly 4 can be controlled through the hydraulic system, which is convenient to control.

[0057] Embodiment 7, a non-cutting sample preparation method for a material thin sheet sample, includes the following steps:

[0058] S1. Take small pieces of the sample that have been crushed by a jaw crusher, and then put them into a vibrating sample mill to process the sample into powder;

[0059] S2. Pour the ground sample into the lower die assembly 4, and then use a scraper to scrape the sample flat along the top surface of the outer die 41;

[0060] S3. Start the device, and the upper die assembly 3 and the lower die assembly 4 cooperate to perform stepped sectional tablet pressing on the sample. The tablet pressing thickness decreases successively from bottom to top, and the tablet pressing pressure increases successively.

[0061] S4. After the tablet pressing is completed, the intermediate punch 33 ejects the formed sample.

[0062] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can 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 thin material sample, comprising a base frame (1), characterized in that: A hydraulic telescopic assembly (2) is provided 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) includes a connecting member (31), the connecting member (31) is fixedly mounted on the telescopic end of the hydraulic telescopic assembly (2), an external pressure head (32) is fixedly mounted on the bottom of the connecting member (31), a telescopic intermediate pressure head (33) is provided inside the external pressure head (32), and a telescopic internal pressure head (35) is provided 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) is provided with an outer die groove (42) on the top. A retractable intermediate top column (44) is provided inside the outer die groove (42). A retractable inner die column (45) is provided inside the intermediate top column (44). The inner die head (35) and the inner die column (45) first perform preliminary pressing on the powder, and then the inner die column (45) rises to be flush with the intermediate die column (44). The intermediate die head (33) cooperates with the intermediate die column (44) to perform secondary pressing.

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), an intermediate pressure head (33) is sealingly and slidingly 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 communicated with the hydraulic chamber 1, and a solenoid valve 1 (38) is provided on the top of the upper hydraulic hole (37).

3. The 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 slidingly connected to 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 through an upper hydraulic inner tube (39).

4. The 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. The non-cutting sample preparation device for a material sheet sample according to claim 4, characterized in that: The outer side of the intermediate 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. The 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), and the middle top column (44) is sealingly and slidingly connected to the hydraulic chamber three. A threaded connection groove (412) is provided at the bottom of the hydraulic chamber three, and 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. The 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 slidingly connected to the hydraulic chamber four. The bottom of the hydraulic chamber four is threadedly connected to a threaded bottom plug (46), and a lower hydraulic inner tube (410) is provided 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 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. The 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 outside of the intermediate top column (44). The positioning ring (441) is sealingly and slidingly 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 bottom surface of the outer 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 four, 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 slidingly 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). The outer side of the second positioning ring (451) is sleeved with a fourth sealing ring (452).

9. The non-cutting sample preparation device for a material sheet sample according to claim 8, characterized in that: A hydraulic control system is provided inside the chassis (1), and 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 through hydraulic pipes. A control panel (5) is fixedly mounted on the front of the hydraulic telescopic assembly (2), and the control panel (5) is used to control the hydraulic control system and the hydraulic telescopic assembly (2). A pipe hole (311) is provided through the outer sides of the connecting member (31) and the base (43), and the hydraulic pipe passes through the pipe hole (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 according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Take a small sample that has been jaw crushed, and then put it into a vibrating 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, start the equipment, the upper die assembly (3) and the lower die assembly (4) cooperate to perform step-by-step tableting on the sample, the tableting thickness decreases from bottom to top, and the tableting pressure increases; S4. After the tableting is completed, the intermediate pressing head (33) ejects the formed sample.

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