A high-throughput scratch-reciprocating friction and wear test device

Abstract

The present invention relates to a high-throughput scratch-reciprocating friction and wear test device, which comprises a base, a movable multi-functional machine head with a multi-station grinding head disc system, a sample holder system, a sample reciprocating-scratching platform, a sample displacement platform, a data acquisition system and a computer system. A sample displacement platform and a support rod are respectively arranged on the base; a sample reciprocating-scratching platform is arranged on the sample displacement platform, and a sample holder system is arranged on the sample reciprocating-scratching platform; the support rod is connected to the movable multi-functional machine head, and the movable multi-functional machine head is located directly above the sample in the sample holder system; the movable multi-functional machine head, the sample holder system, the sample reciprocating-scratching platform and the sample displacement platform are respectively connected to the computer system via the data acquisition system. The present invention can realize the testing of the coating adhesion force, friction coefficient and wear resistance of multiple coating specimens by loading the sample once.

Description

Technical Field

[0001] The present invention relates to the technical field of testing high-throughput coating adhesion and friction and wear properties in materials gene research, and particularly relates to a high-throughput scratch-reciprocating friction and wear test device. Background Art

[0002] The research on the surface properties of materials plays an important role in promoting the development of fields such as national defense technology, high-end equipment, and new materials. Coating materials are involved in various aspects such as aerospace, automotive industry, tool and die, instrumentation, architectural decoration, and biomedicine. The mechanical property indexes of coating products are the primary concerns of both supply and demand sides. How to quickly obtain the mechanical property data of coating materials, accelerate the R & D progress of new coating materials, reduce the detection cost, and meet the rapidly growing demands of the coating industry has become a hot topic of research at home and abroad.

[0003] At present, traditional coating adhesion or tribological property detection equipment has a single detection function. Only one mechanical property of one sample can be tested in one clamping. The process is mostly cumbersome and time-consuming when detecting multiple samples, and the time spent can even be counted in days. For example, traditional friction testing machines mostly adopt a fixed head design. When repeating the detection, it is generally necessary to replace the friction pair or reinstall the sample, which seriously reduces the detection efficiency and cannot cope with future high-throughput material property analysis and detection tasks. Therefore, there is an urgent need for a high-throughput scratch-reciprocating friction test device to shorten the detection time, improve the detection efficiency, and meet the large number of complex detection tasks in the coating R & D process. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a high-throughput scratch-reciprocating friction and wear test device that can test coating adhesion, friction coefficient, and wear resistance.

[0005] To solve the above problems, a high-throughput scratch-reciprocating friction and wear test device of the present invention is characterized in that: the device includes a base, a movable multi-functional head with a multi-station grinding head disk system, a sample holder system, a sample reciprocating-scratching platform, a sample displacement platform, a data acquisition system, and a computer system; the sample displacement platform and a support rod are respectively provided on the base; the sample reciprocating-scratching platform is provided on the sample displacement platform, and the sample holder system is provided on the sample reciprocating-scratching platform; the support rod is connected to the movable multi-functional head, and the movable multi-functional head is located directly above the sample in the sample holder system; the movable multi-functional head, the sample holder system, the sample reciprocating-scratching platform, and the sample displacement platform are respectively connected to the computer system through the data acquisition system.

[0006] The movable multi-functional machine head includes a cantilever beam connected to the support rod and a multi-station grinding head disk; a bearing rotating device I is provided in the middle of the cantilever beam, and one side is connected to the support rod through a slide rail arranged along the Z axis; one end of the bottom of the cantilever beam is provided with a loading rod connected to the multi-station grinding head disk, and the other end is provided with a driving motor V connected to the slide rail, and a loading force sensor is arranged between the driving motor V and the cantilever beam; the multi-station grinding head disk is located above the sample; a friction sensor and an acoustic emission sensor are respectively arranged on the cantilever beam in front of the loading rod; the loading force sensor, the driving motor V, the friction sensor and the acoustic emission sensor are respectively connected to the computer system through the data acquisition system.

[0007] A bearing rotating device II with a driving motor I is provided at the center of the multi-station grinding head disk, and several workstations with internal threads are evenly distributed along the circumferential direction of the multi-station grinding head disk; a scriber or a contact head with an external thread is connected to the workstation, and the scriber or the contact head is located directly above the sample.

[0008] The contact head is composed of a ejector rod with the external thread and a sleeve connected together; a friction pair is arranged in the sleeve.

[0009] The sample holder system includes a bottom plate, a border plate placed on the bottom plate, a support pad I and a support plate I for fixing the sample; a driving motor II is arranged on the bottom plate between the border plate and the support pad I, a crank connecting rod is connected to the driving shaft of the driving motor II, and one end of the crank connecting rod is fixed on the support plate I; a sliding guide rail arranged along the X axis is arranged between the support pad I and the support plate I; the driving motor II is connected to the sample reciprocating-scratching platform through a bolt I via a positioning hole; a displacement sensor I is arranged on the support plate I, and the displacement sensor I and the driving motor II are respectively connected to the computer system through the data acquisition system.

[0010] The sample reciprocating-scratching platform includes an upper cover plate and a lower backing plate; a positioning hole is provided on the upper cover plate, and the upper cover plate is connected to the driving motor II in the sample holder system through the positioning hole; several support pads II are fixed on the lower backing plate, and the several support pads II are connected to the upper cover plate through a reciprocating guide rail I arranged along the Y axis; a support pad III is fixed on one side of the bottom of the upper cover plate, and the support pad III is connected to the lower backing plate through a reciprocating guide rail II arranged along the Y axis; a driving motor III connected to the reciprocating guide rail II is arranged on one side of the support pad III, and the driving motor III is fastened to the upper cover plate through a bolt II; the lower backing plate is fixed on the sample displacement platform through a fastening bolt; a displacement sensor II is arranged on the upper cover plate, and the displacement sensor II and the driving motor III are respectively connected to the computer system through the data acquisition system.

[0011] The sample displacement platform includes a platform base fixed on the base and a reciprocating sliding track placed on the top of the platform base; a linear module is provided on the top of the reciprocating sliding track, and a driving motor IV is connected to one side thereof; the driving shaft of the driving motor IV is connected to the linear module, and the linear module is connected to the lower backing plate in the sample reciprocating-scratching platform through a positioning screw hole; a displacement sensor III is provided on the linear module, and the displacement sensor III and the driving motor IV are respectively connected to the computer system through the data acquisition system.

[0012] The present invention has the following advantages compared with the prior art:

[0013] 1. The present invention is provided with a movable multi-functional machine head with a multi-station grinding head disc system, which can realize the free conversion of friction pairs or styluses, thus solving the problem of single friction pair or stylus disassembly and replacement in traditional equipment.

[0014] 2. The present invention is provided with a sample holder system, which can realize the clamping and fixation of multiple coated specimens or a single large-size range specimen, and solve the problems of multiple clamping or single small-size range sample clamping in traditional equipment.

[0015] 3. The present invention is provided with a sample reciprocating-scratching platform, which can realize the evaluation of reciprocating friction and scratch tests of coated samples on the same equipment, and solve the problem of single test in traditional equipment.

[0016] 4. The present invention is provided with a sample displacement platform, which can realize the evaluation of coating adhesion or friction performance in a large-size range, and solve the problem of performance evaluation size limitation in traditional equipment.

[0017] 5. The present invention is provided with a loading rod and a loading force sensor, which can realize the precise control of long-time and high-stability loading force.

[0018] 6. The present invention is provided with a friction force sensor, a displacement sensor and a friction pair contact head, so that the test of friction coefficient and wear resistance can be carried out.

[0019] 7. The present invention is provided with a friction force sensor, an acoustic emission sensor, a stylus and a displacement sensor, so that the test of coating adhesion can be carried out.

[0020] 8. By adopting the present invention, the scratch method test characterization of the adhesion of multiple coated specimens under different conditions can be realized with a single sample loading; at the same time, the evaluation of the friction coefficient and wear resistance of multiple coated specimens under reciprocating friction conditions can be realized, solving the problems of single coating detection function and cumbersome process at the present stage, and being unable to cope with the large number and complexity of detection tasks in the material gene project, thus providing an efficient and stable test technology for the research of material genomics. Description of the Drawings

[0021] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] Figure 1 It is a three-dimensional structure diagram of the present invention.

[0023] Figure 2 It is a three-dimensional structure diagram of the multi-functional head part in the present invention.

[0024] Figure 3 It is a three-dimensional structure diagram of the sample holder system in the present invention.

[0025] Figure 4 It is a three-dimensional structure diagram of the sample reciprocating-scratch platform in the present invention.

[0026] Figure 5 It is a three-dimensional structure diagram of the sample displacement platform in the present invention.

[0027] In the figure: 1 - movable multi-functional head; 111 - friction force sensor; 112 - acoustic emission sensor; 12 - bearing rotating device I; 13 - loading force sensor; 14 - cantilever beam; 15 - driving motor V; 2 - multi-station grinding head disk system; 21 - contact head; 22 - bearing rotating device II; 23 - driving motor I; 24 - multi-station grinding head disk; 25 - loading rod; 3 - sample holder system; 31 - crank connecting rod; 32 - driving motor II; 33 - frame plate; 34 - support pad I; 35 - support plate I; 4 - sample reciprocating-scratch platform; 41 - driving motor III; 42 - upper cover plate; 43 - lower backing plate; 44 - positioning hole; 45 - support pad II; 46 - support pad III; 5 - sample displacement platform; 51 - driving motor IV, 52 - linear module; 53 - reciprocating sliding track; 6 - base; 7 - support rod. Specific Embodiments

[0028] As Figures 1 to 5 shown, a high-throughput scratch-reciprocating friction and wear test device, the device includes a base 6, a movable multi-functional head 1 with a multi-station grinding head disk system 2, a sample holder system 3, a sample reciprocating-scratch platform 4, a sample displacement platform 5, a data acquisition system, and a computer (including software) system.

[0029] A sample displacement platform 5 and a support rod 7 are respectively provided on the base 6; a sample reciprocating-scratch platform 4 is provided on the sample displacement platform 5, and a sample holder system 3 is provided on the sample reciprocating-scratch platform 4; the support rod 7 is connected to the movable multi-functional head 1, and the movable multi-functional head 1 is located directly above the sample in the sample holder system 3; the movable multi-functional head 1, the sample holder system 3, the sample reciprocating-scratch platform 4, and the sample displacement platform 5 are respectively connected to the computer system through the data acquisition system.

[0030] The movable multi-functional machine head 1 includes a cantilever beam 14 connected to a support rod 7 and a multi-station grinding head disk 24; a bearing rotating device I 12 is provided in the middle of the cantilever beam 14, and one side is connected to the support rod 7 through a slide rail arranged along the Z-axis; one end of the bottom of the cantilever beam 14 is provided with a loading rod 25 connected to the multi-station grinding head disk 24, and the other end is provided with a driving motor V 15 connected to the slide rail, and a loading force sensor 13 is arranged between the driving motor V 15 and the cantilever beam 14; the multi-station grinding head disk 24 is located above the sample; a friction force sensor 111 and an acoustic emission sensor 112 are respectively arranged on the cantilever beam 14 in front of the loading rod 25; the loading force sensor 13, the driving motor V 15, the friction force sensor 111 and the acoustic emission sensor 112 are respectively connected to a computer system through a data acquisition system. The movable multi-functional machine head 1 can realize the movement in the Z-axis direction (vertical direction).

[0031] A bearing rotating device II 22 with a driving motor I 23 is provided at the center of the multi-station grinding head disk 24, and several workstations with internal threads are evenly distributed along the circumferential direction of the multi-station grinding head disk 24; a scriber or contact head 21 with an external thread is connected to the workstation, and the scriber or contact head 21 is located directly above the sample.

[0032] The contact head 21 is composed of a thimble with an external thread and a sleeve connected together; a friction pair is arranged in the sleeve.

[0033] The sample holder system 3 includes a bottom plate and a frame plate 33, a support pad I 34 and a support plate I 35 for fixing the sample placed on the bottom plate; a driving motor II 32 is arranged on the bottom plate between the frame plate 33 and the support pad I 34, and a crank connecting rod 31 is connected to the driving shaft of the driving motor II 32, and one end of the crank connecting rod 31 is fixed on the support plate I 35; a sliding guide rail arranged along the X-axis is provided between the support pad I 34 and the support plate I 35; the driving motor II 32 is connected to the sample reciprocating-scratching platform 4 through a bolt I through a positioning hole 44; a displacement sensor I is arranged on the support plate I 35, and the displacement sensor I and the driving motor II 32 are respectively connected to a computer system through a data acquisition system. The sample holder system 3 can realize the movement in the X-axis direction (horizontal direction).

[0034] The sample reciprocating-scratching platform 4 includes an upper cover plate 42 and a lower backing plate 43; a positioning hole 44 is provided on the upper cover plate 42, and it is connected to the driving motor II 32 in the sample holder system 3 through this positioning hole 44; several supporting pads II 45 are fixed on the lower backing plate 43, and the several supporting pads II 45 are connected to the upper cover plate 42 through a reciprocating guide rail I arranged along the Y-axis; a supporting pad III 46 is fixed on one side of the bottom of the upper cover plate 42, and the supporting pad III 46 is connected to the lower backing plate 43 through a reciprocating guide rail II arranged along the Y-axis; a driving motor III 41 connected to the reciprocating guide rail II is provided on one side of the supporting pad III 46, and the driving motor III 41 is fastened to the upper cover plate 42 by bolt II; the lower backing plate 43 is fixed on the sample displacement platform 5 through fastening bolts; a displacement sensor II is provided on the upper cover plate 42, and the displacement sensor II and the driving motor III 41 are respectively connected to the computer system through a data acquisition system. The sample reciprocating-scratching platform 4 can realize the movement in the Y-axis direction (vertical direction).

[0035] The sample displacement platform 5 includes a platform base fixed on the base 6 and a reciprocating sliding track 53 placed on the top of the platform base; a linear module 52 is provided on the top of the reciprocating sliding track 53, and a driving motor IV 51 is connected to one side of it; the driving shaft of the driving motor IV 51 is connected to the linear module 52, and the linear module 52 is connected to the lower backing plate 43 in the sample reciprocating-scratching platform 4 through a positioning screw hole; a displacement sensor III is provided on the linear module 52, and the displacement sensor III and the driving motor IV 51 are respectively connected to the computer system through a data acquisition system. The sample displacement platform 5 can realize the movement in the X-axis direction (horizontal direction).

[0036] The friction force sensor 111 is of the YZ-65 type, and the acoustic emission sensor 112 is of the AE303S type, provided by Lanzhou Huahui Instrument Technology Co., Ltd.

[0037] Working principle: The driving motor V15 drives the slide rail to move the movable multi-functional head 1 along the Z-axis, and the loading force is accurately loaded through the loading force sensor 13 and the driving motor V15. The supporting plate I35 is moved along the X-axis by the driving motor II32 and the crank connecting rod 31, and the upper cover plate 42 is moved along the Y-axis by the driving motor III41 and the reciprocating guide rail II. The combined action of the two realizes the precise positioning of the sample position. The test sample is in contact with the counter material or the stylus. Under the action of the driving motor IV51 and the linear module 52, the sample reciprocating-scratching platform 4 can perform reciprocating motion or one-way movement along the reciprocating sliding track 53 of the sample displacement platform 5 in the X-axis direction, so as to cause sliding between the test sample and the counter material or the stylus, generating frictional force or acoustic signal. During the experiment implementation process, the frictional force sensor 111, the acoustic emission sensor 112, etc. are affected by force or sound, breaking the original circuit bridge balance and generating electrical signals. The electrical signals are received by the data acquisition system, and after signal processing, they are converted into frictional force, friction coefficient, acoustic signal, etc., and imported into the computer system to complete data acquisition. The friction couple or the stylus can realize multi-directional frictional contact by converting the frictional contact head or the stylus in the multi-station grinding head disk 24 according to the driving motor I23.

[0038] Example 1: Test the high-throughput coating scratch (adhesion). This test is a fixed-load test to evaluate the samples with better film-substrate adhesion in the high-throughput samples. The specific process is as follows:

[0039] Install a stylus on the upper station of the multi-station grinding head disk 24, fix the sample to be tested on the supporting plate I35 in the sample holder system 3, and ensure that the sample reaches the specified position by adjusting the sample holder system 3 (X-axis) and the sample reciprocating-scratching platform 4 (Y-axis). Adjust the position of the loading rod 25 through the driving motor V15 to make the sample contact the stylus, and then apply a fixed load through the loading force sensor 13 and the driving motor V15. The sample reciprocating-scratching platform 4 moves uniformly in one direction along the reciprocating sliding track 53 of the sample displacement platform 5 in the X-axis direction, so as to cause sliding between the test sample and the stylus, generating frictional force, acoustic signal, etc. When the sample fails, the friction coefficient will increase, the acoustic signal will be enhanced and fluctuate greatly, and then the samples with better film-substrate adhesion in the high-throughput samples can be selected. By changing the sample position, multiple tests can be realized. During the experiment implementation process, the sensing device is affected by force and sound, breaking the original circuit bridge balance and generating electrical signals. The electrical signals are received by the data acquisition system, and after signal processing, they are converted into frictional force, friction coefficient, acoustic signal, etc., and imported into the computer system to complete data acquisition.

[0040] Example 2: Test the high-throughput coating scratch (adhesion). This test is a uniform-loading test to test the film-substrate adhesion of the sample. The specific process is as follows:

[0041] A scribing needle is installed on the upper station of the multi-station grinding head disk 24. The sample to be tested is fixed in the sample holder system 3. By adjusting the sample holder system 3 (X-axis) and the sample reciprocating-scratching platform 4 (Y-axis), it is ensured that the sample reaches the specified position. The position of the loading rod 25 is adjusted by the driving motor V15 to make the sample contact the scribing needle, and then a uniform loading load is applied through the loading force sensor 13 and the driving motor V15. At the same time, the sample reciprocating-scratching platform 4 moves uniformly in one direction along the X-axis along the reciprocating sliding track 53 of the sample displacement platform 5. It is set that the termination load is proportional to the scratch displacement, that is, when the loading load reaches the termination load, the scratch length of the sample is the set displacement. When sliding occurs between the test sample and the scribing needle, frictional force, acoustic signal, etc. are generated. When the sample fails, the friction coefficient increases, the acoustic signal becomes stronger and fluctuates greatly, and then the film-substrate adhesion of the sample is measured. By adjusting the sample position, multiple tests can be realized. During the implementation of the experiment, the sensing device is affected by force and sound, breaking the original circuit bridge balance and generating an electrical signal. The electrical signal is received by the data acquisition system, and after signal processing, it is converted into frictional force, friction coefficient, acoustic signal, etc., and imported into the computer system to complete data acquisition.

[0042] Example 3: The friction and wear of high-throughput coatings are tested. This test is a fixed-load test to evaluate the friction and wear behavior of high-throughput samples. The specific process is as follows:

[0043] The contact head 21 corresponding to the upper station on the multi-station grinding head disk 24 is a friction pair module (the friction pair can be a ball or a pin). The sample to be tested is fixed in the sample holder system 3. By adjusting the sample holder system 3 (X-axis) and the sample reciprocating-scratching platform 4 (Y-axis), it is ensured that the sample reaches the specified position. The position of the loading rod 25 is adjusted by the driving motor V15 to make the sample contact the friction pair, and then a fixed load is applied through the loading force sensor 13 and the driving motor V15. The sample reciprocating-scratching platform 4 reciprocates along the X-axis along the reciprocating sliding track 53 of the sample displacement platform 5, so that sliding occurs between the test sample and the friction pair, generating frictional force, friction coefficient, etc. When the sample fails, the friction coefficient will suddenly increase or the friction noise is strong, and then the friction and wear performance of the sample is judged (the friction time or wear distance can also be fixed to judge the friction and wear performance of the sample). By changing the sample position, multiple tests can be realized. During the implementation of the experiment, the sensing device is affected by force and sound, breaking the original circuit bridge balance and generating an electrical signal. The electrical signal is received by the data acquisition system, and after signal processing, it is converted into frictional force, friction coefficient, acoustic signal, etc., and imported into the computer system to complete data acquisition.

Claims

1. A high-throughput scratch-reciprocating friction and wear test device, characterized in that: The device includes a base (6), a movable multi-functional machine head (1) with a multi-station grinding head disk system (2), a sample holder system (3), a sample reciprocating-scratching platform (4), a sample displacement platform (5), a data acquisition system, and a computer system; the sample displacement platform (5) and a support rod (7) are respectively arranged on the base (6); the sample reciprocating-scratching platform (4) is arranged on the sample displacement platform (5), and the sample holder system (3) is arranged on the sample reciprocating-scratching platform (4); the support rod (7) is connected to the movable multi-functional machine head (1), and the movable multi-functional machine head (1) is located directly above the sample in the sample holder system (3). The movable multi-functional machine head (1), the sample holder system (3), the sample reciprocating-scratching platform (4), and the sample displacement platform (5) are respectively connected to the computer system through the data acquisition system; the movable multi-functional machine head (1) includes a cantilever beam (14) connected to the support rod (7) and a multi-station grinding head disk (24); a bearing rotating device I (12) is arranged in the middle of the cantilever beam (14), and one side is connected to the support rod (7) through a slide rail arranged along the Z axis; at one end of the bottom of the cantilever beam (14), a loading rod (25) connected to the multi-station grinding head disk (24) is arranged, and at the other end, a driving motor V (15) connected to the slide rail is arranged. A loading force sensor (13) is arranged between the driving motor V (15) and the cantilever beam (14); the multi-station grinding head disk (24) is located above the sample; a friction force sensor (111) and an acoustic emission sensor (112) are respectively arranged on the cantilever beam (14) in front of the loading rod (25); the loading force sensor (13), the driving motor V (15), the friction force sensor (111), and the acoustic emission sensor (112) are respectively connected to the computer system through the data acquisition system; a bearing rotating device II (22) with a driving motor I (23) is arranged at the center of the multi-station grinding head disk (24), and several workstations with internal threads are evenly distributed along the circumferential direction of the multi-station grinding head disk (24); a scriber or contact head (21) with an external thread is connected to the workstation, and the scriber or contact head (21) is located directly above the sample.

2. The high-throughput scratch-reciprocating friction and wear test device according to claim 1, wherein: The contact head (21) is composed of a ejector rod with the external thread and a sleeve connected together; a friction pair is arranged in the sleeve.

3. A high-throughput scratch-reciprocating friction and wear test device according to claim 1, characterized in that: The sample holder system (3) includes a bottom plate, a frame plate (33) placed on the bottom plate, a support pad I (34), and a support plate I (35) for fixing the sample; a drive motor II (32) is provided on the bottom plate between the frame plate (33) and the support pad I (34), a crank connecting rod (31) is connected to the drive shaft of the drive motor II (32), and one end of the crank connecting rod (31) is fixed on the support plate I (35); a sliding guide rail arranged along the X-axis is provided between the support pad I (34) and the support plate I (35); the drive motor II (32) is connected to the sample reciprocating-scratching platform (4) through a bolt I via a positioning hole (44); a displacement sensor I is provided on the support plate I (35), and the displacement sensor I and the drive motor II (32) are respectively connected to the computer system through the data acquisition system.

4. A high-throughput scratch-reciprocating friction and wear test device according to claim 1, characterized in that: The sample reciprocating-scratching platform (4) includes an upper cover plate (42) and a lower backing plate (43); a positioning hole (44) is provided on the upper cover plate (42), and the upper cover plate (42) is connected to the drive motor II (32) in the sample holder system (3) through the positioning hole (44); several support pads II (45) are fixed on the lower backing plate (43), and the several support pads II (45) are connected to the upper cover plate (42) through a reciprocating guide rail I arranged along the Y-axis; a support pad III (46) is fixed on one side of the bottom of the upper cover plate (42), and the support pad III (46) is connected to the lower backing plate (43) through a reciprocating guide rail II arranged along the Y-axis; a drive motor III (41) connected to the reciprocating guide rail II is provided on one side of the support pad III (46), and the drive motor III (41) and the upper cover plate (42) are fastened through a bolt II; the lower backing plate (43) is fixed on the sample displacement platform (5) through a fastening bolt; a displacement sensor II is provided on the upper cover plate (42), and the displacement sensor II and the drive motor III (41) are respectively connected to the computer system through the data acquisition system.

5. A high-throughput scratch-reciprocating friction and wear test device according to claim 1, characterized in that: The sample displacement platform (5) includes a platform base fixed on the base (6) and a reciprocating sliding track (53) placed on the top of the platform base; a linear module (52) is provided on the top of the reciprocating sliding track (53), and a drive motor IV (51) is connected to one side of the linear module (52); the drive shaft of the drive motor IV (51) is connected to the linear module (52), and the linear module (52) is connected to the lower backing plate (43) in the sample reciprocating-scratching platform (4) through a positioning screw hole; a displacement sensor III is provided on the linear module (52), and the displacement sensor III and the drive motor IV (51) are respectively connected to the computer system through the data acquisition system.

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