Multi-mode self-positioning frictional wear equipment

Abstract

The invention relates to the technical field of friction wear testing machines, in particular to multi-mode self-positioning friction wear equipment which comprises a main rotating shaft, the bottom end of the main rotating shaft is connected with an upper clamp, the upper clamp is of a cylindrical structure and is coaxially connected with the main rotating shaft, and a plurality of upper friction pairs can be installed at the bottom of the upper clamp; the plurality of upper friction pairs are circumferentially distributed around the main rotating shaft; the upper clamp is detachably connected with brushes between the adjacent upper friction pairs, and all the brushes are circumferentially distributed around the main rotating shaft; a lower clamp is arranged below the upper clamp and horizontally connected to the base in a sliding mode, and the top of the lower clamp can clamp a lower friction pair. By arranging a plurality of upper friction pairs, the stability of the upper friction pairs under the conditions of large load and high rotating speed can be improved, and the accuracy of a test result is improved; and the brush can sweep abrasive dust, so that the abrasion between the upper friction pair and the abrasive dust is reduced, and the test result is more accurate. And the lower friction pair can realize two modes of fixing and horizontal reciprocating motion under the clamping of the lower clamp.

Description

Technical Field

[0001] The invention relates to the technical field of friction and wear testing machines, and in particular to a multi-mode self-positioning friction and wear device. Background Art

[0002] Wear-resistant parts are the key core components of engineering machinery. As engineering machinery develops towards large-scale, high-end and diversified directions, the working environment faced by wear-resistant parts has become more severe. Large loads and high contact speeds cause serious wear of wear-resistant parts during service. Friction and wear tests can be used to analyze the wear behavior of wear-resistant parts and better understand the wear resistance of wear-resistant parts and their materials, which is of great significance for improving the performance of wear-resistant parts and their materials and extending their service life.

[0003] During the friction and wear test, friction is performed through the interaction between the upper and lower friction pairs to obtain experimental data. Depending on the friction pair, there are usually ball-on-disk, pin-on-disk and other forms of friction and wear. Among them, pin-on-disk friction and wear mainly simulates the wear condition when abrasive wear occurs, which is more in line with the actual working conditions faced by construction machinery. During the friction and wear test, the upper and lower friction pairs rub against each other by producing wear chips through face-to-face grinding. In the early stage of the test, especially under conditions of small load and low speed, due to fewer external interference factors, the contact surfaces between the upper and lower friction pairs can maintain a good fit, and the contact force distribution is uniform and stable, which helps to reduce the additional wear caused by uneven contact and makes the test results closer to the actual situation. At this time, the generation of wear chips also tends to be regular, which is convenient for analyzing the material wear mechanism and wear rate.

[0004] However, under high load and high speed conditions, the contact between a single pin and the pin disk is often prone to instability, resulting in poor surface contact and a significant increase in the torque between the upper and lower friction pairs, reducing the service life of the equipment and affecting the experimental results. Summary of the invention

[0005] In order to solve the technical problem that in existing friction and wear tests, the upper friction pair is easily unstable under large load and high speed conditions, resulting in poor contact between the upper friction pair and the lower friction pair, causing the life of the friction and wear test equipment to be reduced and affecting the experimental results, the present invention provides a multi-mode self-positioning friction and wear device.

[0006] To achieve the above object, the technical solution adopted by the present invention is: A multi-mode self-positioning friction and wear device comprises a main rotating shaft, the bottom end of which is connected to an upper clamp, the upper clamp is a cylindrical structure, the upper clamp is coaxially connected to the main rotating shaft, a plurality of upper friction pairs can be installed on the bottom of the upper clamp, and the plurality of upper friction pairs are distributed in a circle around the main rotating shaft; brushes are detachably connected between adjacent upper friction pairs of the upper clamp, and all the brushes are distributed in a circle around the main rotating shaft; a lower clamp is provided below the upper clamp, the lower clamp is horizontally slidably connected to a base, and the top of the lower clamp can clamp the lower friction pair.

[0007] By adopting the above structural scheme, by setting up multiple upper friction pairs, the stability of the upper friction pair under high load and high speed can be improved, and the accuracy of the test results can be improved. At the same time, a brush is set to sweep away the wear debris generated by the upper friction pair and the lower friction pair, sweep the wear debris out of the running-in surface, reduce the wear between the upper friction pair and the wear debris, and make the test results more accurate. The lower friction pair can realize two modes of fixed and horizontal reciprocating motion under the clamping of the lower clamp, so that the present application can realize both rotary friction and wear tests and reciprocating friction and wear tests.

[0008] As a preferred implementation of a multi-mode self-positioning friction and wear device, the upper friction pair is a pin, and the lower friction pair is a pin disk.

[0009] As a preferred implementation method of a multi-mode self-positioning friction and wear device, a plurality of tightening holes are opened on the top of the upper clamp, and tightening bolts are threadedly connected in the tightening holes. The axial direction of the tightening holes is arranged parallel to the axial direction of the main rotating shaft, and the plurality of tightening holes are distributed in a circle around the main rotating shaft. A plurality of mounting holes are opened on the bottom of the upper clamp, and each mounting hole is coaxially connected to a tightening hole. The inner diameter of the mounting hole is larger than the inner diameter of the tightening hole, and the mounting hole can cooperate with the clearance of the upper friction pair; an elastic part is installed in the mounting hole, and the bottom of the elastic part can abut against the top of the upper friction pair, and the top of the elastic part can abut against the bottom end of the tightening bolt.

[0010] With the above structural solution, the spring and the upper friction pair are sequentially installed in the installation hole from the bottom of the upper clamp, and the main shaft is vertically moved downward until the upper friction pair contacts the lower friction pair. Through the action of the spring, all the upper friction pairs can automatically adjust the height difference, so that all the upper friction pairs can abut against the top surface of the lower friction pair. After all the upper friction pairs are completely in contact with the lower friction pair, the tightening bolt is screwed into the tightening hole from the top of the upper clamp, and tightening the tightening bolt can limit the movement of the upper friction pair in the vertical direction.

[0011] As a preferred implementation method of a multi-mode self-positioning friction and wear device, a plurality of radial holes are opened on the outer peripheral surface of the upper clamp, and the axial direction of the radial holes is arranged along the radial direction of the upper clamp. Each radial hole is connected to a mounting hole, and a positioning bolt is threadedly connected in the radial hole.

[0012] By adopting the above structural scheme, a positioning bolt is screwed into the radial hole. After tightening the positioning bolt, the positioning bolt can abut against the outer peripheral surface of the upper friction pair, limiting the movement of the upper friction pair in the radial direction and avoiding the upper friction pair from shaking during the test.

[0013] As a preferred implementation of a multi-mode self-positioning friction and wear device, along the axial direction of the main shaft, the length of the brush is smaller than the length of the upper friction pair.

[0014] By adopting the above structural solution, there is no contact between the brush and the lower friction pair, and only the wear debris on the running-in surface is cleaned, thereby reducing the influence of the brush on the test results.

[0015] As a preferred implementation method of a multi-mode self-positioning friction and wear device, the intersection of the axis of the main shaft and the bottom surface of the upper clamp is point O, the midpoint of the line between two adjacent upper friction pairs is point P, and the line between the brush between the two adjacent upper friction pairs and point O passes through point P.

[0016] The above structural solution enables the brush to clean the wear debris more comprehensively.

[0017] As a preferred implementation of a multi-mode self-positioning friction and wear device, the distance between the brush between two adjacent upper friction pairs and point P is smaller than the distance between point O and point P.

[0018] The adoption of the above structural solution further enables the brush to clean the wear debris more comprehensively and timely.

[0019] As a preferred implementation method of a multi-mode self-positioning friction and wear device, an air outlet nozzle is provided on the outside of the lower clamp, the air outlet nozzle is connected to the air source, the air outlet nozzle faces the top surface of the lower clamp, and the air flow path of the air outlet nozzle is flush with the top surface of the lower clamp; a negative pressure collection device is provided on the outside of the lower clamp, and the negative pressure collection device is opposite to the air outlet nozzle.

[0020] By adopting the above-mentioned structural scheme, the air outlet nozzle can gather part of the wear debris generated by friction in the direction of the outlet air flow of the air outlet nozzle, thereby preventing high-temperature wear debris from sticking to the lower clamp and reducing the impact on the clamping accuracy of the lower clamp; the negative pressure collection device can collect the wear debris blown away by the air outlet nozzle to keep the test site clean.

[0021] As a preferred implementation method of a multi-mode self-positioning friction and wear device, a sliding track is provided on one side of the base, and the lower clamp is slidably connected to the sliding track. One side of the lower clamp is connected to one end of the push rod, and the push rod is arranged parallel to the sliding track. The other end of the push rod is connected to the driving structure. The driving mechanism can push the push rod to move in the axial direction, and the driving structure is connected to the base.

[0022] With the above structural solution, the driving mechanism can drive the push rod to move left and right, thereby driving the lower clamp to move horizontally back and forth along the sliding track, thereby making the lower friction pair have a reciprocating motion mode. When the driving mechanism stops driving, the push rod is fixed in position, and under the restriction of the push rod, the lower clamp can be fixed on the sliding track, thereby fixing the position of the lower friction pair.

[0023] As a preferred implementation of a multi-mode self-positioning friction and wear device, it also includes a device body, the top end of the main shaft is connected to a motor, the motor can drive the main shaft to rotate, and the motor and the base are both installed on the device body.

[0024] The beneficial effects of the present invention include: By setting up multiple upper friction pairs, the stability of the upper friction pair under high load and high speed can be improved, and the accuracy of the test results can be improved. At the same time, a brush is set to sweep away the wear debris generated by the upper and lower friction pairs, sweep the wear debris out of the running-in surface, reduce the wear between the upper friction pair and the wear debris, and make the test results more accurate. The lower friction pair can achieve two modes of fixed and horizontal reciprocating motion when clamped by the lower fixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the main shaft and the upper clamp in a specific embodiment of the present invention; Figure 2 It is a schematic diagram of a half-section structure of the main rotating shaft and the upper clamp in a specific embodiment of the present invention; Figure 3 It is a bottom view structural schematic diagram of the upper clamp in a specific implementation manner of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the lower clamp and the base in a specific implementation manner of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the main shaft, the upper clamp, the lower clamp and the base in a specific embodiment of the present invention; Figure 6 It is a schematic diagram of the overall structure of a multi-mode self-positioning friction and wear device in a specific implementation manner of the present invention.

[0027] List of parts and reference numerals: 1. Main shaft; 2. Upper clamp; 3. Tightening bolt; 4. Elastic part; 5. Upper friction pair; 6. Positioning bolt; 7. Brush; 8. Lower clamp; 9. Screw; 10. Lower friction pair; 11. Base; 12. Push rod; 13. Sliding track; 14. Equipment body; 15. Display control panel; 16. Air outlet nozzle; 17. Negative pressure collection device; 18. Motor. DETAILED DESCRIPTION

[0028] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] Reference Figure 1-6 This embodiment proposes a multi-mode self-positioning friction and wear device, including a device body 14, the device body 14 is provided with a table, a display control panel 15 is provided above one side of the table, the display control panel 15 is electrically connected to the controller, and the controller is located inside the device body 14.

[0030] The top of the device body 14 is connected to the motor 18, the motor 18 is electrically connected to the controller, the motor 18 is connected to the top of the main shaft 1, the main shaft 1 is vertically arranged, and the motor 18 can drive the main shaft 1 to rotate. The bottom end of the main shaft 1 is connected to the upper fixture 2, the upper fixture 2 is a cylindrical structure, and the upper fixture 2 is coaxially connected to the main shaft 1. The top of the upper fixture 2 is provided with a plurality of tightening holes, in which tightening bolts 3 are threadedly connected, the axial direction of the tightening holes is arranged parallel to the axial direction of the main shaft 1, and the plurality of tightening holes are distributed circumferentially around the main shaft 1. The bottom of the upper fixture 2 is provided with a plurality of mounting holes, each of which is coaxially connected to a tightening hole, the inner diameter of the mounting hole is larger than the inner diameter of the tightening hole, and the mounting hole can be clearance-matched with the upper friction pair 5, which is a pin; an elastic member 4 is installed in the mounting hole, the bottom of the elastic member 4 can abut against the top of the upper friction pair 5, and the top of the elastic member 4 can abut against the bottom end of the tightening bolt 3. The outer peripheral surface of the upper fixture 2 is provided with a plurality of radial holes, the axial direction of the radial holes is arranged along the radial direction of the upper fixture 2, each of which is connected to a mounting hole, and a positioning bolt 6 is threadedly connected in the radial hole. Thus, the bottom of the upper fixture 2 can be provided with a plurality of upper friction pairs 5, and the plurality of upper friction pairs 5 are distributed circumferentially around the main shaft 1.

[0031] The upper fixture 2 is detachably connected with a brush 7 between adjacent upper friction pairs 5, and all brushes 7 are distributed in a circle around the main rotating shaft 1. Along the axial direction of the main rotating shaft 1, the length of the brush 7 is 0.1mm-1mm smaller than that of the upper friction pair 5. The intersection of the axis of the main rotating shaft 1 and the bottom surface of the upper fixture 2 is point O, the midpoint of the line between two adjacent upper friction pairs 5 is point P, and the line between the brush 7 between two adjacent upper friction pairs 5 and point O passes through point P. The distance between the brush 7 between two adjacent upper friction pairs 5 and point P is smaller than the distance between point O and point P. An air outlet nozzle 16 is provided on the outside of the lower fixture 8, and the air outlet nozzle 16 is connected to the air source, and the air outlet nozzle 16 faces the top surface of the lower fixture 8, and the air flow path of the air outlet nozzle 16 is flush with the top surface of the lower fixture 8. A negative pressure collection device 17 is provided on the outside of the lower fixture 8, and the negative pressure collection device 17 is opposite to the air outlet nozzle 16. The air outlet nozzle 16 and the negative pressure collecting device 17 are both installed on the equipment body 14 .

[0032] A lower clamp 8 is provided below the upper clamp 2. A clamping groove is provided on the top of the lower clamp 8. Threaded holes are provided on the surrounding side walls of the lower clamp 8. The threaded holes are connected to the clamping groove. The clamping groove is used to place the lower friction pair 10. A screw 9 is screwed into the threaded hole. The screw 9 abuts against the side wall of the lower friction pair 10 inside the clamping groove to clamp the lower friction pair 10. The lower friction pair 10 in this embodiment is a pin disk.

[0033] The lower fixture 8 is horizontally slidably connected to the base 11, which is mounted on the table. A sliding track 13 is provided on one side of the base 11. The sliding track 13 in this embodiment is in the form of a track groove. A raised slider is provided on the side of the lower fixture 8. The slider is engaged with the track groove. The slider can slide along the track groove, so that the lower fixture 8 is slidably connected to the sliding track 13. One side of the lower fixture 8 is connected to one end of a push rod 12. The push rod 12 is arranged parallel to the sliding track 13. The other end of the push rod 12 is connected to a driving structure. The driving mechanism can push the push rod 12 to move. The driving structure is connected to the base 11. The driving structure can be arranged inside the base 11. The push rod 12 can be an electric telescopic push rod 12, a pneumatic telescopic push rod 12 or a hydraulic telescopic push rod 12. The driving mechanism can drive the push rod 12 to move left and right, thereby driving the lower fixture 8 to move back and forth horizontally along the sliding track 13, thereby making the lower friction pair 10 have a reciprocating motion mode. When the driving mechanism stops driving, the push rod 12 is fixed in position. Under the restriction of the push rod 12 , the lower clamp 8 can be fixed on the sliding track 13 , thereby fixing the position of the lower friction pair 10 .

[0034] This embodiment can adapt to lower friction pairs 10 of different sizes by disassembling and replacing the lower fixture 8, thereby reducing the restriction on the size of the sample. In this embodiment, one end of the track groove is open, and the lower fixture 8 can be disassembled by pulling it out of the track groove.

[0035] The working principle of this embodiment is: The lower fixture 8 in this embodiment has two motion modes, so that the device can realize two friction and wear tests, namely, a rotational friction and wear test and a reciprocating friction and wear test. The first mode is to start the driving structure, drive the push rod 12 to push the lower fixture 8 to one side of the track, and keep the push rod 12 fixed, so that the position of the lower fixture 8 is fixed; at this time, the lower friction pair 10 is opposite to the upper friction pair 5, and the driving motor 18 drives the main shaft 1 to press down and rotate, so that the upper friction pair 5 and the lower friction pair 10 can generate rotational friction, thereby realizing the rotational friction and wear test. The second mode is to lock the main shaft 1 so that it cannot rotate, start the driving structure, drive the push rod 12 to move left and right, so that the lower fixture 8 moves back and forth along the sliding track 13, the upper friction pair 5 is only pressed down but not rotated, and the lower friction pair 10 moves back and forth to generate friction with the upper friction pair 5, thereby realizing the reciprocating friction and wear test.

[0036] When performing the rotational friction and wear test, the lower friction pair 10 is fixedly clamped in the lower fixture 8, and the spring and the upper friction pair 5 are installed in the mounting hole from the bottom of the upper fixture 2 in sequence, so that the main shaft 1 moves vertically downward until the upper friction pair 5 contacts the lower friction pair 10. Through the action of the spring, all the upper friction pairs 5 can automatically adjust the height difference, so that all the upper friction pairs 5 can abut against the top surface of the lower friction pair 10. After all the upper friction pairs 5 are in full contact with the lower friction pair 10, the tightening bolt 3 is screwed into the tightening hole from the top of the upper fixture 2. Tightening the tightening bolt 3 can limit the movement of the upper friction pair 5 in the vertical direction. The positioning bolt 6 is screwed into the radial hole. After tightening the positioning bolt 6, the positioning bolt 6 can abut against the outer peripheral surface of the upper friction pair 5, limiting the movement of the upper friction pair 5 in the radial direction, and preventing the upper friction pair 5 from shaking during the test. The lower friction pair 10 is clamped on the top of the lower fixture 8, and the main shaft 1 drives the upper friction pair 5 to press down and rotate, so that the rotational friction and wear test can be carried out.

[0037] During the test, the brush 7 can sweep the wear debris generated by the friction between the upper friction pair 5 and the lower friction pair 10 out of the running-in surface, reduce the friction between the upper friction pair 5 and the wear debris, and make the test results more accurate. Since the brush 7 does not contact the running-in surface, it has little impact on the test. The top of the brush 7 is connected to the upper fixture 2 by bolts. When the wear debris has little impact on the running-in surface, such as under low load, the brush 7 can be removed or replaced. The brush 7 can be separated from the bolt to achieve the replacement of the brush 7, meeting the needs of brushes 7 of different lengths and different materials.

[0038] The wear debris generated by friction and wear is extremely small and often accompanied by high temperature. The wear debris brushed out by the brush 7 and discharged normally tends to appear near the lower friction pair 10. As the test proceeds, wear debris is continuously generated and accumulates between the lower friction pair 10 and the lower fixture 8, and adheres to the lower fixture 8 and the surface of the lower friction pair 10. Among them, the wear debris adhered to the lower friction pair 10 has no effect on the test, while the wear debris adhered to the lower fixture 8 is likely to affect the surface accuracy of the fixture if it is not cleaned in time. The lower fixture 8 needs to be cleaned in time as the test proceeds. At this time, the air outlet nozzle 16 can gather part of the wear debris generated by friction according to the direction of the outlet air flow of the air outlet nozzle 16, and blow it to the negative pressure collection device 17 for collection.

[0039] The number of upper friction pairs 5 in this embodiment can be set to three, which can improve the stability of the upper friction pairs 5 and the overall device under high load and high speed conditions and improve the accuracy of the test results. The number of upper friction pairs 5 can also be freely set to meet the requirements of different test conditions.

[0040] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-mode self-positioning friction and wear device, comprising a main rotating shaft (1), characterized in that: The bottom end of the main rotating shaft (1) is connected to the upper clamp (2), the upper clamp (2) is a cylindrical structure, the upper clamp (2) is coaxially connected to the main rotating shaft (1), and a plurality of upper friction pairs (5) can be installed at the bottom of the upper clamp (2), and the plurality of upper friction pairs (5) are distributed in a circle around the main rotating shaft (1); the upper clamp (2) is detachably connected with brushes (7) between adjacent upper friction pairs (5), and all the brushes (7) are distributed in a circle around the main rotating shaft (1); a lower clamp (8) is provided below the upper clamp (2), and the lower clamp (8) is horizontally slidably connected to a base (11), and the top of the lower clamp (8) can clamp the lower friction pair (10).

2. A multi-mode self-positioning friction and wear device according to claim 1, characterized in that: The upper friction pair (5) is a pin, and the lower friction pair (10) is a pin disk.

3. A multi-mode self-positioning friction and wear device according to claim 2, characterized in that: A plurality of tightening holes are formed at the top of the upper clamp (2), and tightening bolts (3) are threadedly connected in the tightening holes. The axial direction of the tightening holes is arranged parallel to the axial direction of the main rotating shaft (1), and the plurality of tightening holes are distributed in a circle around the main rotating shaft (1). A plurality of mounting holes are formed at the bottom of the upper clamp (2), and each mounting hole is coaxially connected to a tightening hole. The inner diameter of the mounting hole is larger than the inner diameter of the tightening hole, and the mounting hole can be clearance-matched with the upper friction pair (5); an elastic member (4) is installed in the mounting hole, and the bottom of the elastic member (4) can abut against the top of the upper friction pair (5), and the top of the elastic member (4) can abut against the bottom end of the tightening bolt (3).

4. A multi-mode self-positioning friction and wear device according to claim 3, characterized in that: The outer peripheral surface of the upper clamp (2) is provided with a plurality of radial holes, the axial direction of the radial holes being arranged along the radial direction of the upper clamp (2), each radial hole being connected to a mounting hole, and a positioning bolt (6) being threadedly connected in the radial hole.

5. The multi-mode self-positioning friction and wear device according to claim 1, characterized in that: Along the axial direction of the main rotating shaft (1), the length of the brush (7) is shorter than the length of the upper friction pair (5).

6. A multi-mode self-positioning friction and wear device according to claim 1, characterized in that: The intersection of the axis of the main rotating shaft (1) and the bottom surface of the upper clamp (2) is point O, the midpoint of the line connecting two adjacent upper friction pairs (5) is point P, and the line connecting the brush (7) between the two adjacent upper friction pairs (5) and point O passes through point P.

7. A multi-mode self-positioning friction and wear device according to claim 6, characterized in that: The distance between the brush (7) between two adjacent upper friction pairs (5) and point P is smaller than the distance between point O and point P.

8. The multi-mode self-positioning friction and wear device according to claim 1, characterized in that: An air outlet nozzle (16) is provided on the outside of the lower clamp (8), the air outlet nozzle (16) is connected to an air source, the air outlet nozzle (16) faces the top surface of the lower clamp (8), and the air flow path of the air outlet nozzle (16) is flush with the top surface of the lower clamp (8); a negative pressure collection device (17) is provided on the outside of the lower clamp (8), and the negative pressure collection device (17) is opposite to the air outlet nozzle (16).

9. The multi-mode self-positioning friction and wear device according to claim 1, characterized in that: A sliding track (13) is provided on one side of the base (11), the lower clamp (8) is slidably connected to the sliding track (13), one side of the lower clamp (8) is connected to one end of a push rod (12), the push rod (12) and the sliding track (13) are arranged in parallel, the other end of the push rod (12) is connected to a driving structure, the driving mechanism can push the push rod (12) to move in an axial direction, and the driving structure is connected to the base (11).

10. The multi-mode self-positioning friction and wear device according to claim 1, characterized in that: The device comprises a device body (14), the top end of the main rotating shaft is connected to a motor (18), the motor (18) can drive the main rotating shaft to rotate, and the motor (18) and the base (11) are both mounted on the device body (14).

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