GB2579267A

GB2579267A - Axial Vibration Trajectory Testing Device

Info

Publication number: GB2579267A
Application number: GB1913500.3A
Authority: GB
Inventors: Tang Zhong; Zhang Haotian; Zhou Yuepeng; Li Yu
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2018-08-23
Filing date: 2018-08-31
Publication date: 2020-06-17
Anticipated expiration: 2038-08-31
Also published as: GB2579267B; GB201913500D0

Abstract

An axial vibration trajectory testing device for a combine harvester threshing drum, comprising a magnetic outer housing (1), a magnetic suspension brush (2), a coordinate card (4) and a shaft end adsorption mechanism (5) which are coaxially mounted, wherein one end of the magnetic outer housing (1) is connected to one end of the shaft end adsorption mechanism (5); one side of the coordinate card (4) is mounted on one end of the shaft end adsorption mechanism (5); the magnetic suspension brush (2) is suspended and fixed inside the magnetic outer housing (1); the tip of one end of the magnetic suspension brush (2) abuts the other side of the coordinate card (4); the magnetic suspension brush (2) is positioned in suspension, and the other parts rotate and vibrate together with the axis; the magnetic suspension brush (2) records a trajectory line which is an upside down and left-and-right mirrored version of the actual axis vibration trajectory on the grid coordinate card (4); and finally the grid coordinate card (4) is inserted into a card reader (6) to obtain an amplified and erected axis runout trajectory. The testing device may be applied to testing the vibration state of threshing drums of various rice combine harvesters and may solve the problem of existing axis vibration testing devices for a threshing drum being susceptible to friction damage by a shaft of the threshing drum.

Description

Axis beat trajectory test device

Technical Field

[0001] The invention belongs to the technical field of combine harvester threshing drum assembly and balance detection, and particularly relates to a combined harvester threshing drum axis beat trajectory testing device.

Background of the Invention

[0002] The threshing drum of the combine harvester is subjected to the impact and entanglement of the material during the threshing process, or the unbalance of the threshing drum itself, so that its axis is continuously beating, which affects the reliability of the structure of the threshing drum and the threshing performance, and it is also easy to make the device malfunction. The detection of the axial pulsation trajectory during the working of the threshing drum and the finding of the cause of the fault are the first steps to solve the problem. It can be seen that the detection of the trajectory of the axial pulsation is very important.

[0003] At present, the device and method for measuring the axis beat trajectory mainly include: Patent CN201410788755.2 invents an experimental method for measuring the axial trajectory of an eddy current sensing device. Two eddy current sensors installed perpendicularly to each other are mounted on the shaft end, and the sensor signals are transmitted to the computer for real-time monitoring, which can effectively suppress some interference signals when the pipeline is detected online or offline, and it has high sensitivity to the detection of defects in the inner and outer walls of metal pipes. Patent CN201410625285.8 invented a method for online measurement of spindle axis trajectory under the cutting condition of CNC machine tool. By arranging three displacement sensors along the circumferential direction of the spindle on the surface to be tested, the influence of spindle speed fluctuation on the separation calculation is eliminated, and rotary error is quickly separated on-line, making the online measurement of the spindle axis trajectory more accurate. Patent CN201420290226.5 invented a shaft trajectory detection sensor system, which adopts a circuit system and uses a single chip microcomputer and an LDC1000 sensor acquisition chip to be stable, reliable, and convenient to expand. The existing axial beat trajectory test system or method mostly uses a displacement sensor or an eddy current sensor to collect the vibration signal of the shaft end, and then transmits the signal to the computer for processing and analysis by using software.

[0004] The above invention patent can realize the test of the axial pulsation trajectory of the threshing drum of the combine harvester, but the test equipment is expensive, the wiring between the sensor and the collector is cumbersome, the entanglement is easy, the installation and the disassembly are inconvenient, and the shaft end is easily damaged by the friction of the sensor. Moreover, the existing circuit for processing a subsequent amplified signal by a computer is complicated, and a technician skilled in software operation is required to be responsible for manipulation, thereby reducing the generality of the detection system. The invention has the advantages of simple structure, low cost and easy manipulation by an experimenter, and is an axial pulsation trajectory testing device for a combine harvester threshing drum which is convenient for installation and application for the design of the rotating shaft structure of the existing threshing drum.

Summary of the Invention

[0005] An object of the present invention is to provide a pivoting track test device for the above problems, which is composed of a magnetic casing, a magnetic suspension brush, a coordinate card fixing piece, a coordinate card, a shaft end suction mechanism, and a card reader. The whole system is adsorbed on the shaft end of the threshing drum, and the internal magnetic hanging brush is suspended and fixed by the magnetic repulsion between the magnetic outer casing part, and the other parts are rotated together with the shaft. The brush leaves a track map on the coordinate card that is upside down and left and right mirrored with the actual axis beat trajectory, and then inserts the coordinate card into the card reader to get the erected axis pulsation. The invention is applicable to the measurement of the axial beat trajectory of various types of rotating shafts. When used for the axial trajectory test of the threshing drum of the combine harvester, the invention not only solves the problem that the existing device is easy to rub and collide with the threshing roller shaft, thereby causing damage to the device, besides those the utility model has the advantages of simple structure, low price, convenient installation and disassembly, and can effectively test the axial pulsation trajectory of the threshing roller. In the existing threshing drum of the combine harvester, the shaft is continuously beated due to the impact and entanglement of the material or due to its own imbalance.

[0006] The technical solution of the present invention is: an axial beat trajectory testing device, comprising a coaxially mounted magnetic outer casing, a magnetic hanging brush, a coordinate card and a shaft end adsorption mechanism; [0007] One end of the magnetic outer casing is connected to one end of the shaft end adsorption mechanism, and one side of the coordinate card is mounted on one end of the shaft end adsorption mechanism; The magnetic suspension brush is suspended and fixed inside the magnetic casing, and the tip of one end of the magnetic suspension brush is opposite to the other side of the coordinate card.

[0008] In the above solution, the magnetic housing comprises a first end cover, a first magnetic piece and a magnetic housing; [0009] One end of the magnetic housing is connected to one end of the shaft end suction mechanism, and the first end cover is mounted on the other end of the magnetic housing. The first magnet piece is mounted on the first end cap and is repulsive to the magnetic force of the other end of the magnetic suspension brush.

100101 In the above solution, the magnetic housing is a magnetic annular cylinder, and the first magnetic piece is a circular magnet. The first end cover is in the shape of a truncated cone. The first circular end of the first end cover is provided with a groove connected to the other end of the magnetic housing. The small circle of the first end cover is provided with a groove for mounting the first magnetic piece.

[0011] In the above solution, the magnetic suspension brush comprises a second magnetic sheet, a second end cover, a magnetic suspension, a third end cover and a brush.

[0012] The third end cover is mounted at one end of the magnetic suspension, and the second end cover is mounted at the other end of the magnetic suspension.

[0013] The brush is mounted on the front end of the third end cap, and the second magnet piece is mounted on the second end cap.

[0014] In the above solution, the magnetic suspension is a magnetic annular cylinder, the second magnetic piece is a circular magnet provided with a groove for mounting the second magnetic piece, and the third end cap is provided with a cylindrical hole for mounting a brush.

[0015] In the above solution, the shaft end adsorption mechanism comprises a magnetic adsorber, an adsorber amplification ring and a connector.

[0016] One end of the connector is connected to one end of the magnetic outer casing, and the other end of the connector is sleeved at one end of the magnetic adsorber; The adsorber amplification loop is sleeved at the other end of the magnetic adsorber, and the adsorber amplification loop is flush with the end face of the magnetic adsorber.

[0017] In the above solution, the magnetic adsorber is a cylindrical magnet, the adsorber amplifying ring is a ring magnet, the connector is a truncated cone-shaped rotating body, and a groove for mounting a magnetic adsorber is provided.

[0018] In the above solution, the other side of the coordinate card is provided with a magnetic coordinate card fixing piece.

[0019] The coordinate card fixing piece is connected to the shaft end adsorption mechanism by magnetic attraction to fix the coordinate card.

[0020] In the above solution, the coordinate card fixing piece is a ring piece, and the brush of the magnetic hanging brush passes through the inner ring of the coordinate card fixing piece to the other side of the coordinate card.

[0021] In the above solution, a card reader is also included.

[0022] The card reader includes a first convex lens, a second convex lens and a lens barrel; the first convex lens and the second convex lens are respectively installed at inner ends of the lens barrel; [0023] The focal length of the first convex lens is fl, the focal length of the second convex lens is f2; the distance between the first convex lens and the coordinate card is less than fl, and the length of the lens barrel is greater than 211.

[0024] Compared with the prior art, the beneficial effects of the present invention are: 1. The invention aims at the problem that the shaft center is continuously beating during the working process of the threshing drum, and designs a shaft beating trajectory testing device for the threshing drum of the combine harvester, which comprises a magnetic shell, a magnetic hanging brush, a coordinate card fixing piece, a coordinate card, a shaft end, a adsorption mechanism and the card reader. The whole device is directly adsorbed on the shaft end of the threshing drum to complete the monitoring of the axis pulsation trajectory. Except for the magnetic hanging brush, other components rotate together with the barrel of the threshing drum, and the magnetic hang brush rests on the external magnetic repulsion. The invention is convenient to use avoiding the cumbersome subsequent processing process and solving the problem of monitoring the complicated trajectory of the axial center of the threshing roller.

[0025] 2. The adsorber amplification ring of the invention has a plurality of different types. According to the diameter of the shaft end to be tested, different types of adsorber amplification rings can be selected outside the magnetic adsorber. The diameter of the shaft end adsorption mechanism is the same as the diameter of the shaft to be tested, and when the shaft end adsorption mechanism and the barrel of the barrel are rotated together, the axes of the two axes are in the same straight line to avoid the problem that the axis beat trajectory test device is not aligned with the axis of the rotating shaft when the shaft diameter changes.

[0026] The invention has simple structure, which does not need to fix multiple sensors on the shaft end and performs data receiving and processing on the computer, thereby avoiding the trouble of intertwining the wiring between the sensors. The device can be directly attached to the shaft end to be tested to complete the detection of the axis beat trajectory, and the installation and disassembly are convenient; After the measurement is completed, the coordinate card is removed and inserted into the card reader, and the amplified axis beat trajectory can be observed, which makes up for the complicated defect of using the computer to process the subsequent amplified signal processing circuit.

[0027] The complete system of the present invention is directly adsorbed to the outside of the axial end of the barrel of the barrel, rather than circumferentially arranging several sensors along the end of the shaft as in conventional test apparatus. During the working process of the threshing drum, even if the radial run-out amplitude is too large, it will not rub and collide with the test device, effectively avoiding the problem that the test system is damaged by friction or collision.

[0028] Compared with the expensive eddy current sensor or the displacement sensor, the invention has the advantages of low cost of raw materials for making various components of the test system, simple manufacturing process, few processes, and easy product quality assurance. In the context of rising labor costs and rising energy prices, production inputs can be effectively reduced.

Brief Descriptions of the Drawings

[0029] Fig.1 Combine harvester threshing drum axis beat trajectory test device assembly drawing.

Fig.2 Side profile view of the magnetic housing assembly.

Fig.3 Side view of the magnetic suspension brush assembly.

Fig.4 The coordinate card is fixed to the main view.

Fig.5 Coordinate card main view.

Fig.6 Shaft end adsorption mechanism structure and coordinate card installation diagram.

Fig.7 Schematic diagram of the reader structure.

Fi g. 8 Magnetic pole distribution diagram.

[0030] In the figure, 1-magnetic housing, 101-first end cover, 102-first magnetic sheet, 103-magnetic housing, 2-magnetic hanging brush, 201-second magnetic sheet, 202-second end cover, 203-magnetic suspension, 204-third end cap, 205-brush, 3-coordinate card holder, 4-coordinate card, 5-axis end suction mechanism, 501-magnetic adsorber, 502-adsorber amplification ring, 503-connector, 6-card reader, 601-first convex lens, 602-second convex lens, 603-lens, 7-axis to be tested.

Detailed Description of the Invention

[0031] The axial beat trajectory testing device of the invention can be used for the beating trajectory test of a plurality of rotating shafts. Hereinafter, the axial run-out trajectory test device is used for the Taihu Star TH988 combine harvester threshing drum axis beat trajectory test as an example, and the present invention is further described in detail with reference to the accompanying drawings, but the scope of protection of the present invention is not limited thereto.

[0032] As shown in Fig.1, the present invention includes a coaxially mounted magnetic casing 1, a magnetic suspension brush 2, a coordinate card fixing piece 3, a coordinate card 4, and a shaft end suction mechanism 5. One end of the magnetic housing 1 is connected to one end of the shaft end adsorption mechanism 5, and the other end of the shaft end adsorption mechanism 5 is attracted to the end of the shaft 7 to be tested by magnetic force; One side of the coordinate card 4 is mounted on one end of the shaft end adsorption mechanism 5. The coordinate card fixing piece 3 is attached to the other side of the coordinate card 4, and is connected to the shaft end adsorption mechanism 5 by magnetic attraction, and the coordinate card 4 is fixed; The magnetic suspension brush 2 is suspended inside the magnetic outer casing 1, and the nib of one end of the magnetic suspension brush 2 is opposite to the other surface of the coordinate card 4, and the other end of the magnetic suspension brush 2 generates a fixed gap by the magnetic repulsive force between the magnetic outer casing 1; When the shaft 7 to be tested starts to rotate, the magnetic housing 1, the coordinate card fixing piece 3, the coordinate card 4, and the shaft end suction mechanism 5 rotate together with the shaft 7 to be tested, except for the magnetic suspension brush 2 which is suspended inside.

[0033] As shown in Fig. 2, the magnetic housing 1 includes a first end cover 101, a first magnetic sheet 102, and a magnetic housing 103 One end of the magnetic housing 103 is connected to one end of the shaft end adsorption mechanism 5. The first end cover 101 is fixed to the other end of the magnetic housing 103 by means of an interference connection, and the first magnet piece 102 is embedded in the center of the first end cover 101.

[0034] The magnetic housing 103 is a magnetic annular cylinder, and the first end cover 101 has a truncated cone shape. The large circular circumference of the first end cover 101 is provided with a groove connected to the other end of the magnetic housing 103, and the small circle of the first end cover 101 is provided with a groove for mounting the first magnetic piece 102.

[0035] The magnetic housing 103 has an inner diameter of 40 mm, an outer diameter of 45 to 47 mm, and a length of 90 to 100 mm. The first end cover 101 has a length of 10 to 12 mm, and the other end of the magnetic housing 103 can be inserted into the groove of the large circumference of the first end cover 101, and is fixed by an interference connection; The first end cover 101 has a small circle diameter of 40 mm; The first magnetic piece 102 is a circular magnet having a thickness of 3 to 5 mm and a diameter of 20 mm. The end surface of the first magnet piece 102 is flush with the end surface of the first end cover 101 and is embedded inside the first end cover 101.

[0036] As shown in Fig. 3, the magnetic suspension brush 2 includes a second magnetic sheet 201, a second end cover 202, a magnetic suspension 203, a third end cover 204 and a brush 205; The third end cap 204 is mounted at one end of the magnetic suspension 203, and the second end cap 202 is mounted at the other end of the magnetic suspension 203 and is fixedly coupled to the magnetic suspension 203 by means of an interference connection. A front end of the third end cover 204 is provided with a columnar hole for assembling the brush 205, and one end of the brush 205 is inserted into the columnar hole to be connected with the third end cover 204; The second magnetic piece 201 is embedded in the center of the second end cover 202; The magnetic suspension body 203 is a magnetic annular cylinder, having an inner diameter of 18 mm, an outer diameter of 24 mm, and a length of 30 to 35 mm; The second magnet piece 201 is a circular magnet, and the second end cover 202 is provided with a groove for mounting the second magnet piece 201. The second end cover 202 has a length of 5 mm and a diameter of 18 mm; The second magnet piece 201 is a circular magnet having a thickness of 2 mm and a diameter of 9 mm. The end surface is flush with the second end cover 202 and embedded in the interior of the second end cover 202. The third end cover 204 is the same size as the second end cover 202. , but there is a columnar hole with a diameter of 3mm in front; The brush 205 is inserted into the columnar hole in front of the third end cover 204, the length is 47-52mm, and the diameter is 3mm.

[0037] As shown in Fig. 4, the coordinate card fixing piece 3 is a ring piece having an outer diameter of 40 mm, an inner diameter of 35 to 37 mm, a thickness of 1 to 2 mm, and is made of a magnet; The coordinate card 4 can be fixed to the rear end of the connector 503 by the magnetic attraction between the coordinate card fixing piece 3 and the shaft end suction mechanism 5.

[0038] As shown in FIG 5, the coordinate card 4 is a circular paper with good light transmittance, and has a diameter of 40 mm; The coordinate card 4 is preferably a grid coordinate card, and a coordinate system and a grid-like grid are printed on the front side. The grid lines are parallel to the x-axis and the y-axis in the coordinate system, and the grid line spacing is 1 mm, and the grid lines are every 5 mm thick. As shown in Fig 6, the shaft end adsorption mechanism 5 includes a magnetic adsorber 501, an adsorber amplification ring 502 and a connector 503; One end of the connector 503 is connected to one end of the magnetic housing 1, and the other end of the connector 503 is sleeved at one end of the magnetic adsorber 501, The adsorber amplification ring 502 is sleeved outside the other end of the magnetic adsorber 501, and the adsorber amplification ring 502 is flush with the end surface of the magnetic adsorber 501; The end face of the other end of the connector 503 abuts against the adsorber amplifying ring 502, and the shaft end suction mechanism 5 is tightly coupled to the magnetic outer casing 1. The other end of the magnetic adsorber 501 is adsorbed on the end of the shaft 7 to be tested by a strong magnetic force.

[0038] The magnetic adsorber 501 is a cylindrical magnet having a diameter of 15-20 mm and a length of 15-20 mm; The adsorber amplifying ring 502 is a ring magnet, and has a plurality of different models, the length is 5-10 mm, and the outer diameter is up to 45-47 mm; When the diameter of the end of the shaft 7 to be tested is larger than the diameter of the magnetic adsorber 501, a suitable type of adsorber amplification ring 502 is sleeved outside the magnetic adsorber 501, so that the diameter of the shaft end adsorption mechanism 5 is the same as the length of the shaft 7 to be tested; The connector 503 is a steel truncated cone body having a length of 35 to 40 mm and consisting of two cylinders of equal length; The connecting portion of the connector 503 and the magnetic adsorber 501 has a diameter of 45 to 47 mm, and the front end has a circular groove having a diameter of 15 to 20 mm and a depth of 10 mm, which is used for inserting the magnetic adsorber 501 and is tightly connected by magnetic attraction; The connecting portion with the magnetic housing 103 has a diameter of 40 mm, which is inserted into the magnetic housing 103, and is closely connected by magnetic attraction.

[0039] As shown in Fig 7, the device further includes a card reader 6; The card reader 6 includes a first convex lens 601, a second convex lens 602 and a lens barrel 603; The first convex lens 601 and the second convex lens 602 are respectively mounted at inner ends of the lens barrel 603.

[0040] After the shaft 7 to be tested stops rotating, the axis of the barrel of the barrel is drawn on the coordinate card 4. The coordinate card fixing piece 3 is detached from the connector 503 together with the coordinate card 4, and is attracted to one end of the lens barrel 603 near the first convex lens 601. The axis of the barrel of the barrel that is enlarged by the card reader 6 can be viewed from one end of the second convex lens 602. The focal length of the first convex lens 601 is fl, the focal length of the second convex lens 602 is f2, and the distance between the first convex lens 601 and the coordinate card 4 is less than fl; The lens barrel 603 is made of steel, which has an outer diameter of 40 mm, an inner diameter of 36 to 38 mm, and a length of the lens barrel 603 of more than 2f1.

[0041] As shown in Fig. 8, the magnetic pole of the magnetic housing 103 is outside, and the S pole is inside; The S pole of the magnetic suspension 203 is outside, the N pole is inside; The S pole of the second magnet piece 201 faces the first magnet piece 102, and the S pole of the first magnet piece 102 faces the second magnet piece 201; The repulsive force between the magnetic poles causes a uniform gap between the magnetic outer casing 1 and the magnetic suspension brush 2, and when the magnetic outer casing 1 rotates with the shaft 7 to be measured, the magnetic suspension brush 2 is fixed.

[0042] The first end cap 101, the second end cap 202 and the third end cap 204 are both made of plastic, and the plastic is well plasticized to form an interference fit with other components so that relative sliding between the components does not Occur.

[0042] The brush 205 has a vertically upward bend on the pen body for eliminating the eccentricity e due to the gravity of the magnetic suspension brush, and the distance of the bending is 1=e.

[0043] The specific implementation process of the model of a combined harvester threshing drum axis beat trajectory test device is as follows: It uses the coordinate card fixing piece 3 to adsorb the coordinate card 4 on the end surface of the connector 503; The shaft end adsorption mechanism 5 is inserted into the magnetic outer casing 1, and the entire test device is attached to the end of the shaft 7 to be tested by the strong magnetic attraction of the magnetic adsorber 501. If the diameter of the shaft 7 to be tested is large, a suitable adsorber amplification ring 502 is set outside the magnetic adsorber 501, so that the diameter of the adsorption end face of the shaft end adsorption mechanism 5 is the same as the axis 7 to be tested; The threshing drum is turned on, and the magnetic hanging brush 2 inside the testing device is suspended and positioned by the magnetic repulsion between the magnetic outer casing 1, and the other portions are rotated together with the barrel of the threshing drum. The brush 205 records on the coordinate card 4 a track map which is upside down and left and right mirrored with the actual axis beat trajectory, and finally inserts the coordinate card 4 into the card reader 6 to obtain an erect axis trajectory which is enlarged and erected.

100441 The series of detailed descriptions set forth above are merely illustrative of specific embodiments of the invention, and are not intended to limit the scope of the invention. Equivalent embodiments or modifications that do not depart from the spirit of the invention are intended to be included within the scope of the invention.

Claims

Claims 1. An axial beat trajectory testing device, is characterized in that it comprises a coaxially mounted magnetic outer casing (1), a magnetic hanging brush (2), a coordinate card (4) and a shaft end adsorption mechanism (5); one end of the magnetic outer casing (1) is connected to one end of the shaft end adsorption mechanism (5); one side of the coordinate card (4) is mounted at one end of the shaft end adsorption mechanism (5); the magnetic hanging brush (2) is suspended and fixed inside the magnetic casing (1), and the tip of one end of the magnetic hanging brush (2) is opposite to the other side of the coordinate card (4).
2. The axial run-out trajectory testing device according to claim 1, is characterized in that, wherein the magnetic housing (1) comprises a first end cover (101), a first magnetic piece (102) and a magnetic housing (103); one end of the magnetic housing (103) is connected to one end of the shaft end suction mechanism (5), and the first end cover (101) is mounted on the other end of the magnetic housing (103), the first magnet piece (102) is mounted on the first end cap (101) and repels the magnetic force at the other end of the magnetic suspension brush (2).
3. The axial run-out trajectory testing device according to claim 2, is characterized in that, wherein the magnetic housing (103) is a magnetic annular cylinder, and the first magnetic piece (102) is a circular magnet, the first end cover (101) has a truncated cone shape, and a large circular circumference of the first end cover (101) is provided with a groove connected to the other end of the magnetic housing (103), the small circle of the first end cover (101) is provided with a recess for mounting the first magnet piece (102).
4. The axial run-out trajectory testing device according to claim 1, is characterized in that, wherein the magnetic suspension brush (2) comprises a second magnetic piece (201), a second end cover (202), a magnetic suspension (203), a third end cap (204) and a brush (205); the third end cap (204) is mounted at one end of the magnetic suspension (203), and the second end cap (202) is mounted at the other end of the magnetic suspension (203); the brush (205) is mounted on the front end of the third end cap (204); the second magnet piece (201) is mounted on the second end cap (202).
5. The axial run-out trajectory testing device according to claim 4, is characterized in that, wherein the magnetic suspension (203) is a magnetic annular cylinder, and the second magnetic piece (201) is a circular magnet, the second end cap (202) is provided with a groove for mounting the second magnet piece (201), and the third end cap (204) is provided with a columnar hole for mounting the brush (205).
6. The axial heartbeat trajectory testing device according to claim 1, is characterized in that, wherein the shaft end adsorption mechanism (5) comprises a magnetic adsorber (501), an adsorber amplification ring (502) and a connector (503); one end of the connector (503) is connected to one end of the magnetic housing (1), and the other end of the connector (503) is sleeved at one end of the magnetic adsorber (501); The adsorber amplification loop (502) is placed over the other end of the magnetic adsorber (501), and the adsorber amplification loop (502) is flush with the end face of the magnetic adsorber (501).
7. The axial run-out trajectory testing device according to claim 6, is characterized in that, wherein the magnetic adsorber (501) is a cylindrical magnet, and the adsorber amplifying ring (502) is a ring magnet, the connector (503) is a truncated cone-shaped rotating body provided with a groove for mounting a magnetic adsorber (501).
8. The axial run-out trajectory testing device according to claim 1, is characterized in that, wherein the other side of the coordinate card (4) is provided with a magnetic coordinate card fixing piece (3); the coordinate card fixing piece (3) is connected to the shaft end suction mechanism (5) by magnetic attraction to fix the coordinate card (4).
9. The axial beat trajectory testing device according to claim 8, is characterized in that, wherein the coordinate card fixing piece (3) is a ring piece, and the brush of the magnetic hanging brush (2) passes through the inner ring of the coordinate card fixing piece (3) against the other side of the coordinate card (4).
10. The axial heartbeat trajectory testing device according to claim 1, is characterized in that, it further comprises a card reader (6); the card reader (6) includes a first convex lens (601), a second convex lens (602), and a lens barrel (603); the first convex lens (601) and the second convex lens (602) are respectively mounted at inner ends of the lens barrel (603); the focal length of the first convex lens (601) is ft, the focal length of the second convex lens (602) is f2; the distance between the first convex lens (601) and the coordinate card (4) is less than ft, and the length of the lens barrel (603) is greater than 2f1.