Raman internal loading type in-situ friction reciprocating testing machine

Abstract

The utility model provides a Raman internal loading type in-situ friction reciprocating testing machine, which comprises a voice coil motor and an X-Z double-shaft sliding table, the voice coil motor and the X-Z double-shaft sliding table are fixed on a fixed base, the upper side of the voice coil motor is connected with a normal force sensor clamp, the normal force sensor clamp is connected with a normal force sensor body, and the normal force sensor body is connected with the X-Z double-shaft sliding table. The normal force sensor body is connected with a sample disc; the X-Z double-axis sliding table is connected with a tangential force sensor clamp, the tangential force sensor clamp is connected with a tangential force sensor body, the tangential force sensor body is connected with a probe clamp, and the probe clamp is connected with a probe body. According to the utility model, an X-Z double-shaft sliding table loading mode and a contact loading mode are adopted, a loading force can be applied by controlling the height of the X-Z double-shaft sliding table, the X-Z double-shaft sliding table is controlled to adjust the test position, and the pressure value can be monitored in real time through the normal force sensor body, so that the purpose of accurate loading is achieved.

Description

Technical Field

[0001] This utility model relates to the field of friction testing, and in particular to a Raman internal loading in-situ friction reciprocating test machine. Background Technology

[0002] The study of friction and wear is crucial in many fields, including materials science and mechanical engineering. In modern industry, friction and wear significantly affect the efficiency and stability of mechanical components and systems. Currently, many scholars utilize Raman spectroscopy for material characterization and analysis. As a powerful non-destructive analytical tool, Raman spectroscopy offers unique advantages in studying the chemical properties and physical structure of materials.

[0003] Existing reciprocating friction testing machines are all non-in-situ testing machines, which cannot realize real-time detection and tracking during the process. The influence of surface material on friction and wear performance is ignored in reciprocating friction and wear performance experiments, resulting in incomplete performance test results.

[0004] In-situ tribological testing machines offer significant advantages for tribological testing and have been successfully applied to various solid lubricant coatings and films. However, current Raman testing primarily focuses on material composition analysis. Tribological testing machines designed to integrate Raman spectroscopy are yet to be developed. Furthermore, there are very few techniques that enable real-time detection and tracking during Raman spectroscopy experiments without sampling or reaction pauses. In-situ analysis methods using Raman spectroscopy are still in the early stages of development in materials science and technology, and it is difficult to determine the tribological properties of materials under different humidity conditions, resulting in low accuracy of material testing results. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of existing technologies, such as difficulty in realizing in-situ friction testing, difficulty in changing the testing environment, and inaccurate test results, and to provide a Raman internal loading in-situ friction reciprocating test machine.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] This utility model provides a Raman internal loading in-situ friction reciprocating test machine, including a voice coil motor and an XZ dual-axis slide. The voice coil motor is fixed to a fixed base by a first bolt, and the XZ dual-axis slide is fixed to the fixed base by a second bolt. The fixed base is connected to a support inside the Raman spectroscopy unit.

[0008] A normal force sensor fixture is connected to the upper side of the voice coil motor via a second bolt. A normal force sensor body is connected to one side of the normal force sensor fixture via a third bolt. A sample tray is connected to the upper side of the normal force sensor body.

[0009] The upper side of the XZ dual-axis slide is connected to a tangential force sensor fixture via a fourth bolt. The tangential force sensor fixture is connected to a tangential force sensor body via a fifth bolt on one side. The tangential force sensor body is connected to a probe fixture via a sixth bolt on one side. The probe fixture is connected to a probe body via a seventh bolt.

[0010] A sphere is connected to the lower part of the probe body.

[0011] In this technical solution, the size of the Raman oscillator is matched, and the friction speed and cycle are controlled by a voice coil motor to simulate friction and wear. The ambient humidity represents the external environment atmosphere.

[0012] Preferably, the normal force sensor body and the tangential force sensor body are respectively connected to the pressure monitoring system.

[0013] Preferably, the voice coil motor is connected to a signal detection and control system.

[0014] Preferably, the normal force sensor body and the tangential force sensor body are respectively connected to a digital transmitter. The digital transmitter is provided with wiring terminals, through which the normal force sensor body, the tangential force sensor body and the signal acquisition card are connected.

[0015] Preferably, the signal acquisition card is provided with terminals with different interface definitions, which are respectively connected to the voice coil motor, the normal force sensor body, the tangential force sensor body, the control system, the Raman PC, the control PC, and the switching power supply.

[0016] Preferably, the voice coil motor is connected to the control system via a data cable.

[0017] In this technical solution, the voice coil motor is controlled by a control system.

[0018] Preferably, the apertures of the normal force sensor fixture and the tangential force sensor fixture are the same, and the apertures of the normal force sensor body and the tangential force sensor body are the same and of the same model.

[0019] Preferably, the surface of the normal force sensor fixture is symmetrically provided with first grooves, and the normal force sensor body is fixed in the first grooves;

[0020] The tangential force sensor fixture has symmetrically formed second grooves on its surface, and the tangential force sensor body is fixed in the second groove.

[0021] In this technical solution, the installation positions of the normal force sensor body and the tangential force sensor body are determined.

[0022] Preferably, a sample body is placed in the sample tray, and a clamping component is provided in the sample tray, the sample body being clamped by the clamping component.

[0023] In this technical solution, a sample tray is used to place the sample.

[0024] Preferably, the clamping assembly includes a partition plate connected to the inner wall of the sample tray, two symmetrically distributed sample clamping plates are disposed above the partition plate, and multiple connecting posts are connected below the sample clamping plates, with the bottom ends of the multiple connecting posts located on the same side connected to the top of the sliding rack.

[0025] A movable toothed plate is provided below the sliding rack. When the sliding rack and the movable toothed plate are in contact, they engage. Multiple symmetrically distributed eccentric wheels are connected to the lower part of the movable toothed plate. The multiple eccentric wheels are respectively connected to the power component.

[0026] The bottom of the movable toothed plate is connected to multiple elastic reset members, and the bottom end of the elastic reset members is connected to the inner wall of the bottom surface of the sample tray.

[0027] In this technical solution, the position of the sample is defined by a clamping component.

[0028] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0029] The positive and progressive effects of this utility model are as follows:

[0030] This invention adopts an XZ dual-axis slide loading method, which uses contact loading. The loading force can be applied by controlling the height of the XZ dual-axis slide, and the test position can be adjusted by controlling the XZ dual-axis slide. Furthermore, the pressure value can be monitored in real time by the normal force sensor body to achieve the purpose of precise loading.

[0031] A voice coil motor is used, and the direction and magnitude of the pulse current in the coil are adjusted through electromagnetic transmission to control the direction and intensity of the magnetic field it generates. The changes in the pulse signal are detected in real time, which are then converted into a friction force signal to obtain the friction coefficient value.

[0032] By using a size that fits the interior of a Raman spectroscopy unit, and by loading and controlling the friction speed and cycle through a voice coil motor, the simulation of friction and wear is achieved, and the ambient humidity represents the external environment atmosphere.

[0033] This invention enables precise evaluation of ball-disc friction and wear under different environmental atmospheres, speeds, and pressures within a Raman spectroscopy chamber. It provides a highly reliable, humidity-controlled loading in-situ friction reciprocating test chamber that significantly reduces testing costs and shortens the development cycle for more effective lubricants and coatings, facilitating real-time detection and tracking. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the Raman internal loading in-situ friction reciprocating test machine according to an embodiment of the present invention.

[0035] Figure 2 for Figure 1 The diagram shows the overall internal structure of the Raman internal loading in-situ friction reciprocating test machine.

[0036] Figure 3 for Figure 1 The diagram shown is a schematic diagram of the principle of the Raman internal loading in-situ friction reciprocating test machine.

[0037] Figure 4 for Figure 1 The diagram shows the internal structure of the sample disc of the Raman internal loading in-situ friction reciprocating tester.

[0038] Figure 5 for Figure 1 The diagram shows a top view of the sample disk structure of the Raman internal loading in-situ friction reciprocating test machine.

[0039] Figure 6 for Figure 4 The diagram shows a partially enlarged structural schematic of point A of the Raman internal loading in-situ friction reciprocating test machine.

[0040] Explanation of reference numerals in the attached figures

[0041] 1. Normal force sensor fixture; 2. Voice coil motor; 3. Fixed base; 4. XZ dual-axis slide table; 5. Tangential force sensor fixture; 6. Normal force sensor body; 7. Tangential force sensor body; 8. Probe fixture; 9. Probe body; 10. Sphere; 11. Sample tray; 12. Sample body;

[0042] 13. Control system; 14. Raman spectroscopy PC; 15. Control PC; 16. Switching power supply; 17. Internal components of the Raman spectroscopy unit; 18. Desiccant; 19. Vacuum oil pump; 20. Hygrometer;

[0043] 21. Clamping assembly; 211. Divider plate; 212. Sample clamping plate; 213. Connecting post; 214. Sliding rack; 215. Moving toothed plate; 216. Eccentric wheel; 217. Elastic reset component;

[0044] 22. Power assembly; 221. Support side plate; 222. Rotating shaft; 223. Rotating gear; 224. Power rack; 225. Synchronizing plate; 226. Telescopic device. Detailed Implementation

[0045] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0046] Figures 1 to 6 The diagram shown is a structural schematic of an embodiment of the Raman internal loading in-situ friction reciprocating test machine of this utility model.

[0047] The testing principle of this application is as follows:

[0048] The loading of the sample body 12 is usually carried out by preloading. The normal load (Fn) acting on the sample body 12 is generated by the elastic deformation of a high-carbon steel cantilever prepared by laser wire cutting process. The cantilever is fixed on the tangential force sensor 7 by a specially designed clamp and connected to the tangential force sensor clamp 5.

[0049] The magnitude of the applied force depends on the cantilever elastic constant (K) and the distance of cantilever deformation (ΔZ).

[0050] At the start of the experiment, a fixed load was preloaded. When the voice coil motor 2 reciprocated, the cantilever would deform by ΔZ due to the lubricating material on the friction surface.

[0051] ΔZ=Z1-Z2

[0052] In the formula: Z1 is the cantilever height before contact; Z2 is the cantilever height after contact; △Z is the difference in deformation height after the cantilever is loaded.

[0053] For the load generated by cantilever deformation:

[0054] Fn=k·ΔZ

[0055] In the formula: k is the elastic coefficient of the cantilever; Fn is the normal load.

[0056] The voice coil motor 2 drives the normal force sensor 6, which carries the sample body 12, to reciprocate. During this motion, the grinding pair remains in contact with the sample body 12, resulting in a constant frictional force (Ff) at the contact interface that opposes relative motion. This force is opposite to the direction of the sample body 12's reciprocating motion and varies periodically. The real-time coefficient of friction (μ) at the contact interface can be calculated as follows:

[0057]

[0058] In the formula: Ff is the frictional force generated during the friction process; Fn is the preloaded load; μ is the friction coefficient of the contact interface during the friction process.

[0059] Example 1

[0060] like Figure 1 and Figure 2As shown, the Raman internal loading in-situ friction reciprocating test machine includes a voice coil motor 2 and an XZ dual-axis slide 4. The voice coil motor 2 is fixed to the fixed base 3 by a first bolt, and the XZ dual-axis slide 4 is fixed to the fixed base 3 by a second bolt. The fixed base 3 is connected to the bracket of the Raman interior 17.

[0061] The voice coil motor 2 is connected to the normal force sensor fixture 1 by a second bolt on its upper side. The normal force sensor fixture 1 is connected to the normal force sensor body 6 by a third bolt on one side. The sample plate 11 is connected to the upper side of the normal force sensor body 6.

[0062] The upper side of the XZ dual-axis slide 4 is connected to a tangential force sensor fixture 5 by a fourth bolt. A tangential force sensor body 7 is connected to one side of the tangential force sensor fixture 5 by a fifth bolt. A probe fixture 8 is connected to one side of the tangential force sensor body 7 by a sixth bolt. A probe fixture 8 is connected to a probe body 9 by a seventh bolt.

[0063] The lower part of the probe body 9 is connected to a sphere 10.

[0064] The connection between the probe body 9 and the sphere 10 can be achieved by welding or bonding.

[0065] In this technical solution, the size of the Raman 17 is matched, and the friction speed and cycle are controlled by the voice coil motor 2 to simulate friction and wear. The ambient humidity represents the external environment atmosphere.

[0066] The normal force sensor body 6 and the tangential force sensor body 7 are respectively connected to the pressure monitoring system.

[0067] The normal force sensor body 6 has holes for fixing the normal force sensor clamp 1 and the sample plate 11, and is connected to a digital transmitter.

[0068] The voice coil motor 2 is connected to the signal detection and control system.

[0069] The normal force sensor body 6 and the tangential force sensor body 7 are respectively connected to the digital transmitter. The digital transmitter is equipped with wiring terminals, which connect the normal force sensor body 6, the tangential force sensor body 7 and the signal acquisition card.

[0070] The signal acquisition card is equipped with terminals with different interface definitions, which are respectively connected to the voice coil motor 2, the normal force sensor body 6, the tangential force sensor body 7, the control system 13, the Raman PC 14, the control PC 15, and the switching power supply 16.

[0071] The signal acquisition card acquires signals from the normal force sensor body 6 and the tangential force sensor body 7, and communicates with the secondary system of the control PC15 via a data cable.

[0072] The voice coil motor 2 is connected to the control system 13 via a data cable.

[0073] The voice coil motor 2 is connected to the driver of the control system 13 via a data cable, and the voice coil motor 2 communicates with the driver via the data cable.

[0074] In this technical solution, the voice coil motor 2 is controlled by the control system, and the speed is controlled by the voice coil motor 2 to measure the friction force and the coefficient of friction.

[0075] The normal force sensor fixture 1 and the tangential force sensor fixture 5 have the same hole diameter, and the normal force sensor body 6 and the tangential force sensor body 7 have the same hole diameter and the same model.

[0076] The surface of the normal force sensor fixture 1 is symmetrically provided with a first groove, and the normal force sensor body 6 is fixed at the first groove.

[0077] The tangential force sensor fixture 5 has a second groove symmetrically formed on its surface, and the tangential force sensor body 7 is fixed in the second groove.

[0078] In this technical solution, the installation positions of the normal force sensor body 6 and the tangential force sensor body 7 are determined.

[0079] The sample plate 11 contains the sample body 12.

[0080] like Figure 3 As shown, the normal force sensor fixture 1 to the sample plate 11 and other structures are disposed in and connected to the Raman interior 17. The Raman interior 17 is connected to the control system 13, Raman PC 14, control PC 15, switching power supply 16 and hygrometer 20 respectively. The Raman interior 17 is connected to the desiccant 18. The desiccant 18 is connected to the vacuum oil pump 19. The vacuum oil pump 19 is connected to the Raman interior 17.

[0081] The control system 13, Raman PC14, and control PC15 are interconnected.

[0082] The control system 13 includes a signal acquisition card, a digital transmitter, a power supply module, a driver, etc.

[0083] A humidity control system consisting of desiccant 18, vacuum oil pump 19, and hygrometer 20 is used to achieve precise humidity control and simulate the humidity of real application scenarios.

[0084] When using it, first check the equipment status, calibrate the equipment zero point, adjust the coordinate system and sampling rate, and set the experiment termination time.

[0085] Then adjust the contact position between the sphere 10 and the sample 12, connect the power supply to the voice coil motor 2, communicate the driver with the control PC15, open the control software, adjust the zero point of the voice coil motor 2, set the pulse, reciprocating speed, distance, and waveform of the voice coil motor 2, and control the voice coil motor 2 to reciprocate.

[0086] Then, using the XZ dual-axis slide 4, the height of the probe body 9 and the ball 10 is adjusted. The power supply current of the digital transmitter, sensor, and signal acquisition card is introduced. The signal acquisition card communicates with the control PC15. The software parameters are adjusted to control the XZ dual-axis slide 4 to suspend the friction and wear test position. The pressure and the speed of the voice coil motor 2 are adjusted. The external humidity is controlled to reach the specified value to complete the simulation of different humidity environments in the in-situ friction experiment. The Raman spectrometer is used for real-time detection and tracking.

[0087] The voice coil motor 2 drive and monitoring system is started. The sample disk 11 starts at a set speed under the action of the normal force sensor clamp 1. The probe body 9 and the sample body 12 move in the transverse axis direction and reciprocate at the speed driven by the voice coil motor 2.

[0088] The voice coil motor 2 is driven at a constant speed, so its voltage will change with the change of friction load. The change of voltage signal reflects the magnitude of friction force and load value. The voltage signal is acquired by the signal acquisition card and converted into friction force value f and load value q. The friction coefficient μ is obtained by the ratio of friction force f to load q.

[0089] After the specified experimental duration t ends, the control equipment stops collecting data, and the motor is stopped by the voice coil motor 2. The probe body 9, the sphere 10 and the sample body 12 are then removed.

[0090] The wear rate W of sample 12 can be calculated from experimental weighing data, and the calculation process is as follows:

[0091] W = (M0 - M1) / M0 × 100%.

[0092] In this application, the friction pair is radially positioned on the sample body 12 by the probe body 9, which restricts the five degrees of freedom of the friction pair. Its X-direction movement degree of freedom is constrained by the pressure of the probe body 9.

[0093] Different friction pair material systems can be used, and the friction pair material and sample body 12 can be replaced to achieve friction and wear tests under different humidity atmospheres.

[0094] Example 2

[0095] like Figures 4 to 5As shown, a clamping component 21 is provided inside the sample tray 11, and the sample tray 11 clamps the sample body 12 through the clamping component 21.

[0096] The clamping assembly 21 includes a partition plate 211 connected to the inner wall of the sample tray 11. Two symmetrically distributed sample clamping plates 212 are arranged above the partition plate 211. Multiple connecting posts 213 are connected below the sample clamping plates 212. The bottom ends of the multiple connecting posts 213 located on the same side are connected to the top of the sliding rack 214.

[0097] A movable toothed plate 215 is provided below the sliding rack 214. When the sliding rack 214 and the movable toothed plate 215 are in contact, they engage. Multiple symmetrically distributed eccentric wheels 216 are in contact below the movable toothed plate 215. The multiple eccentric wheels 216 are respectively connected to the power assembly 22.

[0098] The bottom of the movable toothed plate 215 is connected to a plurality of elastic reset members 217, and the bottom end of the elastic reset members 217 is connected to the inner wall of the bottom surface of the sample plate 11.

[0099] In this technical solution, the position of the sample body 12 is defined by the clamping component 21.

[0100] The power assembly 22 includes a support side plate 221 and a rotating shaft 222. The inner wall of the bottom surface of the sample disk 11 is connected to two symmetrically distributed rotating shafts 222. One end of the eccentric wheel 216 is connected to the rotating shaft 222, and the other end of the eccentric wheel 216 is rotatably connected to the inner wall of the side surface of the sample disk 11. The surface of the rotating shaft 222 is rotatably connected to the support side plate 221.

[0101] The rotating shaft 222 is connected to a rotating gear 223 at the end away from the eccentric wheel 216. The rotating gear 223 is meshed with the top side of the power rack 224. One side of the power rack 224 is connected to the side of the synchronization plate 225. The synchronization plate 225 is connected to the telescopic device 226. The telescopic device 226 is installed on the inner wall of the bottom surface of the sample tray 11.

[0102] During measurement, the sample body 12 is placed in the sample tray 11 and fixed with the clamping assembly 21. The grinding pair is glued to the cantilever, and the cantilever and the grinding pair are fixed in place. The positions of the probe body 9 and the ball 10 are adjusted, and a constant load is applied according to the elastic deformation of the cantilever.

[0103] In use, the two sample clamps 212 can be slid according to the shape of the sample body 12 so that the sample clamps 212 on both sides are in close contact with the sides of the sample body 12. Then, the telescopic device 226 is used to drive the synchronous strip 225 to move, thereby driving the synchronous strip 225 to move synchronously, which in turn drives the rotating gear 223 to rotate. At this time, the rotating shaft 222 can be driven to rotate, which in turn drives the eccentric wheel 216 to rotate.

[0104] When the sliding sample clamp 212 is slidable, it can drive the connecting column 213 and the sliding rack 214 to move synchronously.

[0105] When the eccentric wheel 216 rotates, it can drive the movable toothed plate 215 to move with the elastic reset member 217, so that the movable toothed plate 215 is in close contact with the sliding rack 214, thereby making the movable toothed plate 215 and the sliding rack 214 engage. At this time, the position of the sliding rack 214 can be locked, and then the positions of the connecting column 213 and the sample clamping plate 212 can be locked. Thus, the two sample clamping plates 212 can be used to clamp and fix different sample bodies 12, so that the sample body 12 can be subjected to in-situ friction reciprocating test.

[0106] The elastic reset component 217 is a spring or other component with elastic reset function.

[0107] The telescopic device 226 is an electric push rod, a telescopic cylinder, or other equipment with autonomous telescopic function.

[0108] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A Raman internally loaded in-situ reciprocating friction tester characterized by: Includes a voice coil motor (2) and an XZ dual-axis slide (4). The voice coil motor (2) is fixed to a fixed base (3) by a first bolt, and the XZ dual-axis slide (4) is fixed to a fixed base (3) by a second bolt. The fixed base (3) is connected to a bracket inside the Raman (17). The voice coil motor (2) is connected to a normal force sensor fixture (1) via a second bolt on its upper side. The normal force sensor fixture (1) is connected to a normal force sensor body (6) via a third bolt on one side. The sample plate (11) is connected to the upper side of the normal force sensor body (6). The upper side of the XZ dual-axis slide (4) is connected to a tangential force sensor fixture (5) by a fourth bolt. The tangential force sensor fixture (5) is connected to a tangential force sensor body (7) by a fifth bolt on one side. The tangential force sensor body (7) is connected to a probe fixture (8) by a sixth bolt on one side. The probe fixture (8) is connected to a probe body (9) by a seventh bolt. The probe body (9) is connected to a sphere (10) at its lower part.

2. The Raman internal loading in-situ friction reciprocating testing machine as described in claim 1, characterized in that: The normal force sensor body (6) and the tangential force sensor body (7) are respectively connected to the pressure monitoring system.

3. The Raman internally loaded in situ friction reciprocating test machine of claim 1, wherein: The voice coil motor (2) is connected to the signal detection and control system.

4. The Raman internally loaded in situ friction reciprocating test machine of claim 1, wherein: The normal force sensor body (6) and the tangential force sensor body (7) are respectively connected to the digital transmitter. The digital transmitter is provided with wiring terminals, which connect the normal force sensor body (6), the tangential force sensor body (7) and the signal acquisition card.

5. The Raman internally loaded in situ friction reciprocating test machine of claim 4, wherein: The signal acquisition card is equipped with terminals with different interface definitions, which are respectively connected to the voice coil motor (2), the normal force sensor body (6), the tangential force sensor body (7), the control system (13), the Raman PC (14), the control PC (15), and the switching power supply (16).

6. The Raman internally loaded in situ friction reciprocating test machine of claim 1, wherein: The voice coil motor (2) is connected to the control system (13) via a data cable.

7. The Raman internally loaded in situ friction reciprocating test machine of claim 1, wherein: The normal force sensor fixture (1) and the tangential force sensor fixture (5) have the same hole diameter, and the normal force sensor body (6) and the tangential force sensor body (7) have the same hole diameter and the same model.

8. The Raman internally loaded in situ friction reciprocating test machine of claim 1, wherein: The surface of the normal force sensor fixture (1) is symmetrically provided with a first groove, and the normal force sensor body (6) is fixed at the first groove; The tangential force sensor fixture (5) has a second groove symmetrically formed on its surface, and the tangential force sensor body (7) is fixed in the second groove.

9. The Raman internally loaded in situ friction reciprocating test machine of claim 1 wherein: The sample tray (11) contains a sample body (12), and a clamping assembly (21) is provided inside the sample tray (11). The sample tray (11) clamps the sample body (12) through the clamping assembly (21).

10. The Raman internally loaded in situ friction reciprocating test machine of claim 9, wherein: The clamping assembly (21) includes a partition plate (211) connected to the inner wall of the sample tray (11). Two symmetrically distributed sample clamping plates (212) are arranged above the partition plate (211). Multiple connecting posts (213) are connected below the sample clamping plates (212). The bottom ends of the multiple connecting posts (213) located on the same side are connected to the top of the sliding rack (214). A movable toothed plate (215) is provided below the sliding rack (214). When the sliding rack (214) and the movable toothed plate (215) are in contact, they engage. Multiple symmetrically distributed eccentric wheels (216) are connected to the lower part of the movable toothed plate (215). The multiple eccentric wheels (216) are respectively connected to the power assembly (22). The bottom of the movable toothed plate (215) is connected to a plurality of elastic reset members (217), and the bottom end of the elastic reset members (217) is connected to the inner wall of the bottom surface of the sample plate (11).

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