Triaxial test sample preparation device and sample preparation and demoulding method thereof

Abstract

The present invention provides a triaxial test sample preparation device and a sample preparation and demoulding method thereof, comprising a movable test frame, a clamping assembly arranged in the middle of the test frame for fixing a cylinder for sample preparation, and a pressure assembly arranged at both ends of the test frame for compressing the sample preparation material in the cylinder by synchronous telescopic means, wherein the pressure assembly is connected to a controller on the test frame through a signal to control the stroke and telescopic speed. The present invention solves the problems of low sample preparation accuracy, insufficient sample preparation effect, and large sample preparation demoulding damage existing in the prior art by controlling the rotation of a stepper motor, synchronous compaction of the pressure assemblies at both ends, and ejection and demoulding of the pressure assembly at the bottom.

Description

Technical Field

[0001] The invention relates to the technical field of sample preparation for triaxial test in civil engineering, in particular to a sample preparation device for triaxial test and a method for sample preparation and demoulding using the sample preparation device. Background Art

[0002] The triaxial test is a very important test in the field of civil engineering. With the continuous advancement of science and technology, researchers in the field of civil engineering often need to conduct a large number of triaxial tests. In this test, most of them still use traditional sample preparation devices, and the sample preparation process is completely completed by manpower, which often wastes a lot of time and energy, and the sample preparation effect is not good. Therefore, it is necessary to design and manufacture a new triaxial test sample preparation device to improve the test efficiency and quality for researchers in this field.

[0003] Analyzing the traditional sample preparation device, we can find that its main problems are as follows: first, the traditional sample preparation device relies entirely on manpower during use, which consumes a lot of human physical strength and energy; second, if multiple layers of compaction are required, the manual operation has low precision and requires repeated measurements; third, the traditional sample preparation device always applies force from above during the sample preparation process, which will cause the lower layer of soil to be more compact and the upper layer to be relatively loose. If pressure is applied from top to bottom at the same time, better results will be achieved; fourth, the traditional sample preparation device has a three-petal demolding method, which can easily damage the sample and has low efficiency.

[0004] Although there are currently related patents that provide new device solutions for triaxial sample preparation, they can only solve part of the above problems and there is still a lot of room for improvement. The triaxial test sample preparation device involved in this patent will solve all of the above problems and provide a new device solution for triaxial test sample preparation. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a triaxial test sample preparation device and a sample preparation and demolding method thereof, which solves the problems of low sample preparation accuracy, insufficient sample preparation effect and large sample preparation and demolding damage in the prior art.

[0006] According to an embodiment of the present invention, a triaxial test sample preparation device includes a movable test frame, a clamping assembly arranged in the middle of the test frame for fixing a cylinder for sample preparation, and a pressure-applying assembly arranged at both ends of the test frame for compressing the sample preparation material in the cylinder by synchronous extension and contraction. The pressure-applying assembly is connected to a controller on the test frame through a signal to control the stroke and extension and contraction speed, and the pressure-applying assembly is driven to extend and contract by a stepper motor.

[0007] Preferably, the pressure-applying assembly includes a guide rail arranged on the test frame, a lead screw rotatably arranged in the guide rail, a slider threadedly connected to the lead screw, and a pressure head connected to the slider, the guide rail is provided with a guide groove, the slider is connected to a limit block slidably arranged in the guide groove, and the lead screw is driven by the stepper motor.

[0008] Preferably, the slider is a frame structure, and a guide rod passing through the end of the guide rail is arranged in the middle, a guide column is arranged at the center of one end of the slider, and a guide hole coaxially opened at the end of the pressure head to cooperate with the guide column.

[0009] Preferably, the pressure head comprises a connecting column and a pressure plate coaxially arranged at one end of the connecting column, and the outer diameter of the pressure plate is equal to the inner diameter of the cylinder.

[0010] Preferably, the cylinder member includes an upper sleeve and a lower sleeve, the inner diameter and outer diameter of the upper sleeve and the lower sleeve are equal, and the connecting ends of the upper sleeve and the lower sleeve are respectively provided with annular connecting protrusions and connecting grooves, and a tight connection between the upper sleeve and the lower sleeve is achieved through the connecting protrusions and the connecting grooves.

[0011] Preferably, the clamping assembly includes fastening bolts threadedly connected to the test frame, the fastening bolts are distributed around the axis of the pressure assembly, the fastening bolts are horizontally arranged, and the fastening bolts clamp the cylinder through a fastening plate that can be attached to the outer circumferential surface of the cylinder.

[0012] Preferably, the fastening plate is made by cutting the remaining scraps during the production of the cylinder, and an arc groove is provided on the fastening plate, and the diameter of the arc corresponding to the arc groove is equal to the outer diameter of the cylinder.

[0013] Preferably, a handle is provided at one end of the fastening bolt, and a positioning column is coaxially provided at the other end, and a positioning hole for inserting the positioning column is opened on the fastening plate.

[0014] Preferably, the fastening bolts on the test stand are arranged in groups, and each group of the fastening bolts is provided with no less than two fastening bolts, and the fastening bolts of a group are distributed along the axial direction of the cylinder and share one fastening plate.

[0015] The sample preparation and demoulding method of the triaxial test sample preparation device includes the following steps: Step 1: Initialization. After the test frame is fixed, the pressure components at both ends of the test frame are energized, and the "initialization" function on the controller is started. At this time, the pressure components at both ends respectively control the corresponding sliders to move to the top and bottom of the test frame, and the initialization is completed; Step 2: Install the pressure head. The two pressure heads of the required size are positioned and bolted on the two sliders respectively through the guide columns and guide holes; Step 3: Install the cylinder. The lower sleeve matching the pressure head is sleeved on the pressure head at the bottom of the test frame. The two pressure heads are controlled to move relative to each other by the controller until the spacing between the two pressure plates is less than the length of the lower sleeve. The lower sleeve is manually lifted so that the lower sleeve can contain the two pressure plates at the same time, and the inner wall of the lower sleeve is in contact with the outer circumference of the two pressure plates to achieve the coaxiality detection of the lower sleeve and the two pressure heads. At this time, the lower sleeve is clamped by tightening the bolts, and after the lower sleeve is fixed, the "initialization" function is started again, and the upper sleeve is installed on the lower sleeve in cooperation; Step 4: Positioning, control the movement of the two pressing heads through the controller so that the pressure plates corresponding to the two pressing heads just enter the upper sleeve and the lower sleeve respectively; Step 5: Add materials and prepare samples, manually move the upper sleeve upward, pour the sample preparation material into the lower sleeve along the gap between the upper pressure plate and the lower sleeve, then connect the upper sleeve to the lower sleeve, and set the height of the compacted material through the controller to start sample preparation; at this time, the controller can control the rotation of the output shaft of the stepper motor according to the moving distance of the two pressure plates. After the pressure plate reaches the set position, it stays for three seconds, and then controls the pressure plate to return to the initial position of sample preparation; Step 6: Use the form of three-time compaction sample preparation, repeat step 5 three times, and add a certain amount of material through the upper sleeve before compaction until the material sample preparation is completed; Step 7: Demolding. Start the demolding function of the controller. The controller controls the upper slider to return to the "initialization" position. During this process, remove the upper sleeve and then control the lower slider to move upward. After the pressure head at the bottom slowly pushes the sample out from the top of the lower sleeve, stop the movement of the pressure head and the tester takes away the sample, and the demolding is completed.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The controller is used to control the rotation of the stepper motor, and the stepper motor drives the lead screw to rotate to realize the movement of the pressure head, which improves the accuracy of the compaction process, thereby improving the accuracy of the material sample preparation, and can meet the requirements of multi-layer sample preparation.

[0018] 2. The material is compacted from both ends by two pressure heads, so that the density of the upper and lower layers of the material sample in the cylinder is consistent, thereby improving the quality of the material sample.

[0019] 3. The matching pressure head, upper sleeve, lower sleeve and fastening plate can be made according to the test requirements and then applied to the test stand, which improves the versatility of the sample preparation device.

[0020] 4. The material sample is ejected through the pressure plate below, which not only achieves efficient demoulding but also reduces the damage to the material sample during the demoulding process.

[0021] 5. The upper sleeve and the lower sleeve are matched. During the sample preparation process, the upper sleeve can be moved upward to add sample preparation materials into the lower sleeve without moving the pressure plate, thus ensuring the coaxiality between the pressure plate and the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0023] Figure 2 Schematic diagram of the structure of the slider in the embodiment of the present invention.

[0024] Figure 3 Schematic diagram of the structure of the guide rail in an embodiment of the present invention.

[0025] Figure 4 Schematic diagram of the structure of the pressure head in an embodiment of the present invention.

[0026] Figure 5 Schematic diagram of the structure of the upper sleeve in an embodiment of the present invention.

[0027] Figure 6 Schematic diagram of the structure of the fastening bolt in the embodiment of the present invention.

[0028] Figure 7 Schematic diagram of the structure of the lower sleeve in an embodiment of the present invention.

[0029] In the above drawings: 1. test frame; 2. stepper motor; 3. slider; 4. guide rail; 5. pressure head; 6. upper sleeve; 7. fastening bolt; 8. lower sleeve; 9. wire; 10. controller; 11. universal wheel; 12. limit block; 13. guide column; 14. guide groove; 15. guide hole; 16. pressure plate; 17. connecting protrusion; 18. positioning column; 19. fastening thread; 20. connecting groove; 21. positioning hole; 22. fastening plate. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0031] like Figure 1-7As shown, in order to improve the accuracy and efficiency of sample preparation and the quality of the prepared material samples, the present invention proposes a triaxial test sample preparation device, comprising a movable test frame 1, a clamping assembly arranged in the middle of the test frame 1 for fixing a cylinder for sample preparation, and a pressure-applying assembly arranged at both ends of the test frame 1 for compressing the sample preparation material in the cylinder by synchronous telescopic means, the pressure-applying assembly is connected to a controller 10 on the test frame 1 through a signal to control the stroke and telescopic speed, and the pressure-applying assembly is driven to telescope by a stepping motor 2.

[0032] The sample preparation can be for making soil samples. A universal wheel 11 is installed at the bottom of the test frame 1. Since the test frame 1 adopts a frame structure as a whole, the universal wheel 11 can be arranged to facilitate the movement of the sample preparation device. Then, the universal wheel 11 is selected to be fixed. After the test frame 1 is moved to the selected position, the sample preparation device is fixed by fixing the universal wheel 11.

[0033] The controller 10 is connected to the stepper motor 2 in the pressure assembly through a wire 9. The stepper motor 2 is provided with an encoder to control the speed and number of revolutions of the stepper motor 2, thereby controlling the speed at which the pressure assembly compresses the soil sample and the height of the finished soil sample.

[0034] After the cylinder is fixed by the clamping assembly, the pressure assembly can seal the two ends of the cylinder. In this way, when the soil sample is loaded, controlling the pressure assembly can also prevent the soil sample from leaking. After loading, the soil sample can also be compacted. In addition, when compacting in this form, there is a lack of positioning. Therefore, a scale can be set on the pressure assembly to observe the length of the pressure assembly entering the cylinder, so as to determine the height of the soil sample.

[0035] like Figure 1-4 As shown, in order to improve the precision of the movement of the pressure head 5. The pressure assembly includes a guide rail 4 arranged on the test frame 1, a lead screw rotatably arranged in the guide rail 4, a slider 3 threadedly connected to the lead screw, and a pressure head 5 connected to the slider 3. The guide rail 4 is provided with a guide groove 14, and the slider 3 is connected with a limit block 12 slidably arranged in the guide groove 14, and the lead screw is driven by the stepper motor 2. The matching arrangement of the limit block 12 and the guide groove 14 makes the movement of the slider 3 more stable; the output shaft of the stepper motor 2 is coaxially fixedly connected to one end of the lead screw. When the lead screw rotates, the slider 3 is restricted by the limit block 12, so that the slider 3 moves in the guide rail 4 along the axial direction of the lead screw, thereby realizing the reciprocating movement of the slider 3 in the vertical direction.

[0036] like Figure 2-3As shown, in order to further improve the movement accuracy of the slider 3. The slider 3 is a frame structure, and a guide rod passing through the end of the guide rail 4 is arranged in the middle. A guide column 13 is arranged at the center of one end of the slider 3, and a guide hole 15 coaxially cooperating with the guide column 13 is opened at the end of the pressure head 5. The slider 3 includes four guide rods passing through the end of the guide rail 4, and the movable ends of the four guide rods are connected by a plate, and the guide column 13 is connected to the plate. Here, the guide column 13 is arranged in a coaxial form with the lead screw for easy positioning, and the guide column 13 is coaxial with the guide hole 15 and the pressure head 5. In this way, during the compaction process of the soil sample, the soil sample can be subjected to more uniform force.

[0037] like Figure 1 As shown, in order to prevent the soil sample poured into the cylinder from falling from the bottom of the cylinder, the pressure head 5 includes a connecting column and a pressure plate 16 coaxially arranged at one end of the connecting column, and the outer diameter of the pressure plate 16 is equal to the inner diameter of the cylinder. The soil sample can be compacted tightly, and the soil sample can be made into a cylinder while preventing leakage of the soil sample, thereby improving the quality of the soil sample.

[0038] like Figure 1 , Figure 5 and Figure 7 The cylinder member comprises an upper sleeve 6 and a lower sleeve 8, the inner diameter and the outer diameter of the upper sleeve 6 and the lower sleeve 8 are equal, and the connecting ends of the upper sleeve 6 and the lower sleeve 8 are respectively provided with an annular connecting protrusion 17 and a connecting groove 20, and the tight connection between the upper sleeve 6 and the lower sleeve 8 is achieved through the connecting protrusion 17 and the connecting groove 20. By setting the connecting protrusion 17 and the connecting groove 20, the connection between the upper sleeve 6 and the lower sleeve 8 is made tighter; similarly, before compacting the soil sample, the two pressure plates 16 are positioned first. At this time, the top surface of the upper pressure plate 16 is in the same plane with the top surface of the upper sleeve 6, and the bottom surface of the lower pressure plate 16 is in the same plane with the bottom surface of the lower sleeve 8. After positioning the two pressure plates 16, the soil sample is loaded and the height of the soil sample after compression is set. In this way, according to the overall height of the cylinder, it is convenient to set the moving distance of each pressure plate 16, so that the height of the compacted soil sample is the same as the set height, thereby improving the accuracy of sample preparation.

[0039] like Figure 1 , Figure 6 and Figure 7As shown. The clamping assembly includes a fastening bolt 7 threadedly connected to the test frame 1, the fastening bolt 7 is distributed around the axis of the pressure assembly, the fastening bolt 7 is horizontally arranged, and the fastening bolt 7 clamps the cylinder through a fastening plate 22 that can be attached to the outer circumferential surface of the cylinder. A fastening thread 19 is arranged on the fastening bolt 7, and a threaded hole matching the fastening thread 19 is opened on the frame in the middle of the test frame 1. After the cylinder is axially positioned, the cylinder is held by hand, the fastening bolt 7 is rotated, and the fastening plate 22 is placed between the fastening bolt 7 and the cylinder to fix the cylinder; the fastening plate 22 increases the force-bearing area of ​​the cylinder, which can prevent the cylinder from being deformed due to force.

[0040] As a preferred embodiment of the present invention, the fastening plate 22 is made by cutting the remaining material during the production of the cylinder, and an arc groove is provided on the fastening plate 22, and the diameter of the arc corresponding to the arc groove is equal to the outer diameter of the cylinder. Alternatively, the fastening plate 22 is positioned so that the length direction of the fastening plate 22 is parallel to the axial direction of the cylinder, and then the fastening plate 22 is directly welded to the cylinder.

[0041] like Figure 1 , Figure 6 and Figure 7 As shown. A handle is provided at one end of the fastening bolt 7, and a positioning column 18 is coaxially provided at the other end. A positioning hole 21 for inserting the positioning column 18 is provided on the fastening plate 22. By inserting the positioning column 18 into the positioning hole 21, the connection between the fastening bolt 7 and the fastening plate 22 is more stable to avoid slippage.

[0042] like Figure 1 As shown. The fastening bolts 7 on the test stand 1 are arranged in groups, and each group of the fastening bolts 7 is provided with no less than two fastening bolts 7. The fastening bolts 7 of a group are distributed along the axial direction of the cylinder and share a fastening plate 22. A group of fastening bolts 7 is provided with two fastening bolts 7, and the two fastening bolts 7 can clamp the top and bottom ends of the cylinder, and cooperate with the fastening plate 22 to make the cylinder more evenly stressed.

[0043] The sample preparation and demoulding method of the triaxial test sample preparation device includes the following steps: Step 1: Initialization. After the test frame 1 is fixed, the pressure components at both ends of the test frame 1 are powered on, and the "initialization" function on the controller 10 is started. At this time, the pressure components at both ends respectively control the corresponding sliders 3 to move to the top and bottom ends of the test frame 1, and the initialization is completed; Step 2: Install the pressure head 5. The two pressure heads 5 of the required size are positioned and bolted on the two sliders 3 through the guide columns 13 and the guide holes 15; Step 3: Install the cylinder, put the lower sleeve 8 matched with the pressure head 5 on the pressure head 5 at the bottom of the test frame 1, and control the relative movement of the two pressure heads 5 by the controller 10 until the distance between the two pressure plates 16 is less than the length of the lower sleeve 8, and then manually lift the lower sleeve 8 so that the lower sleeve 8 can contain the two pressure plates 16 at the same time, and the inner wall of the lower sleeve 8 fits with the outer circumference of the two pressure plates 16 to achieve the coaxiality detection of the lower sleeve 8 and the two pressure heads 5. At this time, the lower sleeve 8 is clamped by the tightening bolts 7, and after the lower sleeve 8 is fixed, the "initialization" function is started again, and the upper sleeve 6 is installed on the lower sleeve 8; Step 4: Positioning, control the movement of the two pressure heads 5 respectively by the controller 10, so that the pressure plates 16 corresponding to the two pressure heads 5 just enter the upper sleeve 6 and the lower sleeve 8 respectively; Step 5: Add materials for sample preparation. Manually move the upper sleeve 6 upward, pour the sample preparation material into the lower sleeve 8 along the gap between the upper pressure plate 16 and the lower sleeve 8, then connect the upper sleeve 6 to the lower sleeve 8, and set the height of the compacted material through the controller 10 to start sample preparation; at this time, the controller 10 can control the rotation of the output shaft of the stepper motor 2 according to the moving distance of the two pressure plates 16. After the pressure plate 16 reaches the set position, it stays for three seconds, and then controls the pressure plate 16 to return to the initial position of sample preparation; Step 6: Use the form of three-time compaction sample preparation, repeat step 5 three times, and add a certain amount of material through the upper sleeve 6 before compaction until the material sample preparation is completed; Step 7: Demolding. Start the demolding function of the controller 10. The controller 10 controls the upper slider 3 to return to the "initialization" position. During this process, the upper sleeve 6 is removed, and then the lower slider 3 is controlled to move upward. After the pressing head 5 at the bottom slowly pushes the sample out from the top of the lower sleeve 8, the movement of the pressing head 5 is stopped, and the tester takes the sample away, and the demolding is completed.

[0044] In addition, when multiple samples are prepared, by starting the "initialization" function in step one, installing the upper sleeve 6 on the lower sleeve 8, and repeating steps four to seven, all soil samples can be prepared.

[0045] After the sample preparation is completed, the "initialization" function is started. After the initialization is completed, the controller 10 and the stepper motor 2 are powered off, and the pressure head 5, the upper sleeve 6 and the lower sleeve 8 are removed to facilitate subsequent test personnel to prepare samples of other sizes.

Claims

1. Triaxial test sample preparation device, characterized by: The invention comprises a movable test frame (1), a clamping assembly arranged in the middle of the test frame (1) for fixing a sample preparation cylinder, and a pressure-applying assembly arranged at both ends of the test frame (1) for compressing the sample preparation material in the cylinder by synchronously extending and retracting. The pressure-applying assembly is connected to a controller (10) on the test frame (1) via a signal to control the stroke and retracting speed. The pressure-applying assembly is driven to retract and retract via a stepping motor (2). The pressure-applying assembly comprises a guide rail (4) arranged on the test frame (1), a lead screw rotatably arranged in the guide rail (4), a slider (3) threadedly connected to the lead screw, and a pressure head (5) connected to the slider (3); a guide groove (14) is arranged on the guide rail (4); a limit block (12) slidably arranged in the guide groove (14) is connected to the slider (3); and the lead screw is driven by the stepping motor (2); The slider (3) is a frame structure, and a guide rod is arranged in the middle part thereof and passes through the end of the guide rail (4); a guide column (13) is arranged at the center of one end of the slider (3); and a guide hole (15) coaxially arranged at the end of the pressure head (5) and cooperating with the guide column (13); The pressure head (5) comprises a connecting column and a pressure plate (16) coaxially arranged at one end of the connecting column, and the outer diameter of the pressure plate (16) is equal to the inner diameter of the cylinder; The cylinder member comprises an upper sleeve (6) and a lower sleeve (8), the inner diameter and the outer diameter of the upper sleeve (6) and the lower sleeve (8) are equal, and the connecting ends of the upper sleeve (6) and the lower sleeve (8) are respectively provided with an annular connecting protrusion (17) and a connecting groove (20), and a tight connection between the upper sleeve (6) and the lower sleeve (8) is achieved through the connecting protrusion (17) and the connecting groove (20); The clamping assembly comprises a fastening bolt (7) threadedly connected to the test frame (1), the fastening bolts (7) being distributed around the axis of the pressure-applying assembly, the fastening bolts (7) being arranged horizontally, and the fastening bolts (7) clamping the cylinder through a fastening plate (22) that can be attached to the outer circumferential surface of the cylinder.

2. The triaxial test sample preparation device according to claim 1, characterized in that: The fastening plate (22) is made by cutting the remaining material during the production of the cylinder, and an arc groove is provided on the fastening plate (22), and the diameter of the arc corresponding to the arc groove is equal to the outer diameter of the cylinder.

3. The triaxial test sample preparation device according to claim 1, characterized in that: A handle is provided at one end of the fastening bolt (7), and a positioning column (18) is coaxially provided at the other end; a positioning hole (21) for inserting the positioning column (18) is provided on the fastening plate (22).

4. The triaxial test sample preparation device according to claim 1, characterized in that: The fastening bolts (7) on the test stand (1) are arranged in groups, and each group of the fastening bolts (7) is provided with no less than two fastening bolts (7). The fastening bolts (7) in a group are distributed along the axial direction of the cylinder and share a fastening plate (22).

5. The sample preparation and demoulding method of the triaxial test sample preparation device according to any one of claims 1 to 4, characterized in that: The following steps are included: Step 1: Initialization. After the test frame (1) is fixed, the pressure components at both ends of the test frame (1) are powered on, and the "initialization" function on the controller (10) is started. At this time, the pressure components at both ends respectively control the corresponding sliders (3) to move to the top and bottom of the test frame (1), and the initialization is completed; Step 2: Install the pressure head (5), and position two pressure heads (5) of required size through the guide column (13) and the guide hole (15) and respectively install them on the two slide blocks (3) with bolts; Step 3: Install the cylinder, and put the lower sleeve (8) matched with the pressure head (5) on the pressure head (5) at the bottom end of the test frame (1), and control the relative movement of the two pressure heads (5) by the controller (10) until the distance between the two pressure plates (16) is smaller than the length of the lower sleeve (8), and then manually lift the lower sleeve (8) so that the lower sleeve (8) can contain the two pressure plates (16) at the same time, and the inner wall of the lower sleeve (8) fits with the outer peripheral surface of the two pressure plates (16), so as to realize the coaxiality detection of the lower sleeve (8) and the two pressure heads (5), and at this time, clamp the lower sleeve (8) by tightening the bolts (7), and after the lower sleeve (8) is fixed, start the "initialization" function again, and install the upper sleeve (6) on the lower sleeve (8); Step 4: Positioning, controlling the movement of the two pressing heads (5) by means of the controller (10) so that the pressing plates (16) corresponding to the two pressing heads (5) exactly enter the upper sleeve (6) and the lower sleeve (8) respectively; Step 5: Add materials for sample preparation. Manually move the upper sleeve (6) upward, pour the sample preparation material into the lower sleeve (8) along the gap between the upper pressure plate (16) and the lower sleeve (8), then connect the upper sleeve (6) to the lower sleeve (8), and set the height of the compacted material through the controller (10) to start sample preparation. At this time, the controller (10) can control the rotation of the output shaft of the stepper motor (2) according to the moving distance of the two pressure plates (16). After the pressure plate (16) reaches the set position, it stays for three seconds, and then controls the pressure plate (16) to return to the initial position of sample preparation. Step 6: adopting the form of three-time compaction sample preparation, repeating step 5 three times, and adding a certain amount of material through the upper sleeve (6) before compaction until the material sample preparation is completed; Step 7: Demolding. Start the demoulding function of the controller (10). The controller (10) controls the upper slider (3) to return to the "initialization" position. During this process, the upper sleeve (6) is removed, and then the lower slider (3) is controlled to move upward. After the pressure head (5) located below slowly pushes the sample out from the top of the lower sleeve (8), the movement of the pressure head (5) is stopped, and the test personnel take away the sample, and the demoulding is completed.

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