Concentricity measuring equipment

Abstract

The invention belongs to the technical field of part measurement, and discloses concentricity measuring equipment which comprises a base and a shell fixedly connected to the base. According to the invention, after the stepped shaft is fixed in the mounting frame, the height of the rotor of the vertical linear motor is adjusted, so that the fixed laser head is located at the designed size height of the stepped shaft, and then the driving motor is started to drive the rotating shaft to rotate, so that the stepped shaft is driven to rotate; then a transverse linear motor is controlled to be started through a control panel, a laser emitting device is made to move in the direction of a mounting frame so as to measure the concentricity of the stepped shaft, and when the laser emitting device moves to the next section of the stepped shaft, two movable laser heads are made to move to be matched with the size of the section by rotating an adjusting column, so that the concentricity of the stepped shaft is measured. And meanwhile, the third straight gear drives the two racks to move, so that the moving distances of the two movable laser heads are the same, and the measurement accuracy of positive and negative errors is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of parts measurement, in particular to a concentricity measuring device. Background Art

[0002] The stepped shaft is a mechanical part whose cross section changes in a stepped shape along the axis. Stepped shafts are widely used in various mechanical transmission systems. Their main function is to install transmission parts such as gears, bearings, couplings, clutches, and transmit torque and power. Because they need to install multiple different transmission parts, their own concentricity is very important. When the concentricity error of a part is greater than the allowable error, it is not only difficult to assemble, but also the gears, bearings and other matching parts installed on it will produce uneven wear due to the concentricity error during the actual work process, resulting in a significant reduction in the service life of related parts. At the same time, during its rotation, the error will cause imbalance between the rotating parts, causing mechanical vibration, which will increase noise and affect the stability of the entire system. Therefore, it is very important to measure the concentricity of the stepped shaft.

[0003] Currently, the concentricity of stepped shafts is mostly measured using dial indicators and micrometers. After long-term use, errors will occur in both types of mechanical equipment. At the same time, because mechanical inspection requires contact with the outer surface of the concentric shaft, the surface of the stepped shaft is easily scratched, causing problems in subsequent assembly and lubrication, causing damage to the equipment. Summary of the invention

[0004] The object of the present invention is to provide a concentricity measuring device to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a concentricity measuring device, comprising a base and a shell fixedly connected thereto, the front side of the shell is provided with a control panel, and one side thereof is hinged with a closed door, the top surface of the base is fixedly connected with a back plate, the inner side of the shell relative to the back plate is fixedly connected with a photosensitive plate, the front side of the back plate is fixedly provided with two vertical linear motors, the movers of the two vertical linear motors are fixedly connected with a horizontal linear motor, the mover of the horizontal linear motor is fixedly connected with a laser emitting device, the front side of the back plate is rotatably installed with a mounting tube, the front end of the mounting tube is fixedly connected with a mounting frame, the inside of the mounting frame is rotatably installed with a rotating shaft, the front end of the mounting frame is fixedly connected with a centering frame, the side of the centering frame is abutted with a first spur gear, the inside of the mounting frame is rotatably installed with a second spur gear, the side of the second spur gear and one end of the rotating shaft are fixedly connected with mutually meshing transmission bevel gears, and the inside of the centering frame is fixedly sleeved with a stepped shaft.

[0006] As a preferred solution of the present invention, the laser emitting device includes a shell and a fixed laser head fixedly connected to the center of the front side thereof, a first slide groove symmetrically arranged in the upper and lower parts of the shell is provided inside, a movable laser head is slidably connected in the first slide groove, a rack is fixedly connected to the rear side of the movable laser head, a third spur gear is arranged inside the shell, and the third spur gear is meshed with the rack.

[0007] As a preferred solution of the present invention, two adjusting bevel gears with axes perpendicular to each other are further provided inside the shell, one of the adjusting bevel gears is coaxial with the third spur gear, and the other adjusting bevel gear is fixedly connected to an adjusting column passing through the shell.

[0008] As a preferred solution of the present invention, a plurality of circular grooves are formed on the inner side surface of the centering frame, a ball spring frame is slidably connected in the circular groove, and a supporting ball is clamped at the front end of the ball spring frame.

[0009] As a preferred solution of the present invention, a driving motor is fixedly connected to the top surface of the shell, and the output shaft of the driving motor is fixedly sleeved with two first bevel gears. Two vertical transmission shafts are rotatably installed on the rear side of the back plate. The upper ends of the two transmission shafts are respectively sleeved with one-way bearings with opposite locking directions, and the side surfaces of the one-way bearings are sleeved with a second bevel gear. The other end of the transmission shaft is fixedly sleeved with a third bevel gear, and the second bevel gear is meshed with the corresponding first bevel gear.

[0010] As a preferred solution of the present invention, the mounting tube and the rotating shaft extending out from the rear side of the back plate are both fixedly sleeved with a fourth bevel gear, and the fourth bevel gear is meshed with the adjacent third bevel gear.

[0011] As a preferred solution of the present invention, the driving motor is electrically connected to the control panel, the vertical linear motor and the horizontal linear motor are electrically connected to the control panel, and the laser emitting device is electrically connected to the control panel.

[0012] As a preferred solution of the present invention, a through groove is provided on the top surface of the base, and the through groove is located directly below the stepped shaft.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. In the present invention, after the stepped shaft is fixed in the mounting frame, a laser emitting device is provided, and the height of the mover of the vertical linear motor is adjusted so that the fixed laser head is located at the designed height of the stepped shaft. Then, the driving motor is started to drive the rotating shaft to rotate through the bevel gear and the transmission shaft, and then the first spur gear drives the stepped shaft to rotate through the transmission. Then, the horizontal linear motor is started by controlling the control panel to move the laser emitting device toward the mounting frame to measure the concentricity of the stepped shaft. When the laser emitting device moves to the next section of the stepped shaft, the two movable laser heads are moved to adapt to the size of the section by rotating the adjusting column, thereby realizing rapid adjustment of the measurement size. At the same time, the two racks are driven to move by the third spur gear, so that the moving distances of the two movable laser heads are the same, thereby ensuring the measurement accuracy of positive and negative errors.

[0015] 2. Secondly, the present invention provides a mounting frame, and when the driving motor rotates in the forward direction, the two first bevel gears on the output shaft of the driving motor respectively drive the second bevel gear meshing therewith to rotate. At this time, the second bevel gear transmission connected to the fourth bevel gear fixed on the mounting tube idles due to the one-way bearing sleeved inside it, that is, the second bevel gear cannot drive the transmission shaft inside it to rotate when it rotates, so that it can only drive the rotating shaft to rotate when the driving motor rotates in the forward direction. When the driving motor rotates in the reverse direction, the one-way bearing inside the second bevel gear corresponding to the mounting tube is locked, so that the second bevel gear drives the corresponding transmission shaft and the third bevel gear to rotate, and then the corresponding fourth bevel gear rotates, so that the mounting tube drives the mounting frame to rotate, and the stepped shaft in the mounting frame rotates to measure the other end. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic cross-sectional view of the housing of the present invention;

[0018] Figure 3 It is a right view of the overall structure of the present invention;

[0019] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0020] Figure 5 For the present invention Figure 4 Enlarged view of point B in the middle;

[0021] Figure 6 For the present invention Figure 3 Enlarged view of point C in the middle;

[0022] Figure 7 This is a schematic diagram of the backplane area structure of the present invention;

[0023] Figure 8 It is a cross-sectional view of the mounting frame and the centering frame of the present invention;

[0024] Fig. 9 It is a cross-sectional view of the laser emitting device of the present invention.

[0025] In the figure: 1. base; 2. shell; 3. control panel; 4. closed door; 5. photosensitive plate; 6. back plate; 7. drive motor; 8. first bevel gear; 9. transmission shaft; 10. one-way bearing; 11. second bevel gear; 12. third bevel gear; 13. fourth bevel gear; 14. vertical linear motor; 15. horizontal linear motor; 16. laser emitting device; 17. mounting frame; 18. stepped shaft; 19. mounting tube; 20. rotating shaft; 21. centering frame; 22. first spur gear; 23. second spur gear; 24. transmission bevel gear; 25. ball spring frame; 26. support ball; 27. shell; 28. fixed laser head; 29. ​​first slide groove; 30. movable laser head; 31. third spur gear; 32. rack; 33. adjustment bevel gear; 34. adjustment column. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figures 1 to 9 As shown, an embodiment of the present invention provides a concentricity measuring device, including a base 1 and a shell 2 fixedly connected thereto, a control panel 3 is arranged on the front side of the shell 2, and a closed door 4 is hinged on one side thereof, a back plate 6 is fixedly connected to the top surface of the base 1, a photosensitive plate 5 is fixedly connected to the inner side of the shell 2 relative to the back plate 6, two vertical linear motors 14 are fixedly arranged on the front side of the back plate 6, the movers of the two vertical linear motors 14 are fixedly connected to the horizontal linear motor 15, and the movers of the horizontal linear motor 15 are fixedly connected to the laser emitter The front side of the back plate 6 is rotatably mounted with a mounting tube 19, the front end of the mounting tube 19 is fixedly connected with a mounting frame 17, the interior of the mounting frame 17 is rotatably mounted with a rotating shaft 20, the front end of the mounting frame 17 is fixedly connected with a centering frame 21, the side of the centering frame 21 is abutted with a first spur gear 22, the interior of the mounting frame 17 is rotatably mounted with a second spur gear 23, the side of the second spur gear 23 and one end of the rotating shaft 20 are fixedly connected with mutually meshing transmission bevel gears 24, and the interior of the centering frame 21 is fixedly sleeved with a stepped shaft 18.

[0028] In the present invention, after the stepped shaft 18 is fixed in the mounting frame 17, the height of the mover of the vertical linear motor 14 is adjusted to make the fixed laser head 28 located at the designed height of the stepped shaft 18, and then the driving motor 7 is started to drive the rotating shaft 20 to rotate through the bevel gear and the transmission shaft 9, and then the first spur gear 22 drives the stepped shaft 18 to rotate through the transmission, and then the horizontal linear motor 15 is controlled to start through the control panel 3 to move the laser emitting device 16 toward the mounting frame 17 to measure the concentricity of the stepped shaft 18. When the laser emitting device 16 moves to the next section of the stepped shaft 18, the two active laser heads 30 are moved to adapt to the size of the section by rotating the adjusting column 34, thereby realizing rapid adjustment of the measurement size. At the same time, the two racks 32 are driven to move by the third spur gear 31, so that the moving distances of the two active laser heads 30 are the same, thereby ensuring the measurement accuracy of positive and negative errors.

[0029] Secondly, the present invention provides a mounting frame 17. When the drive motor 7 rotates in the forward direction, the two first bevel gears 8 on the output shaft of the drive motor 7 respectively drive the second bevel gear 11 meshing therewith to rotate. At this time, the second bevel gear 11, which is transmission-connected to the fourth bevel gear 13 fixed on the mounting tube 19, idles due to the one-way bearing 10 sleeved inside it. That is, the second bevel gear 11 cannot drive the transmission shaft 9 inside it to rotate when it rotates, so that when the drive motor 7 rotates in the forward direction, it can only drive the rotating shaft 20 to rotate. When the drive motor 7 rotates in the reverse direction, the one-way bearing 10 inside the second bevel gear 11 corresponding to the mounting tube 19 is locked, so that the second bevel gear 11 drives the corresponding transmission shaft 9 and the third bevel gear 12 to rotate, and then the corresponding fourth bevel gear 13 rotates, so that the mounting tube 19 drives the mounting frame 17 to rotate, and the stepped shaft 18 in the mounting frame 17 rotates 180 degrees to measure the other end.

[0030] Among them, the laser emitting device 16 includes a shell 27 and a fixed laser head 28 fixedly connected to the center of its front side surface. A first slide groove 29 symmetrically arranged in the upper and lower parts is provided inside the shell 27. A movable laser head 30 is slidably connected in the first slide groove 29. A rack 32 is fixedly connected to the rear side surface of the movable laser head 30. A third spur gear 31 is arranged inside the shell 27, and the third spur gear 31 is meshed with the rack 32.

[0031] like Fig. 9As shown, by setting up two movable laser heads 30, when measuring the concentricity of the stepped shaft 18, the distance between the two movable laser heads 30 and the fixed laser head 28 is adjusted according to the concentricity error range of the stepped shaft 18, and the third spur gear 31 is driven to rotate, driving the racks 32 on both sides to move, thereby making the two movable laser heads 30 approach or move away from each other, thereby achieving synchronous adjustment of the two movable laser heads 30, and preventing the problem of positive error or negative error being different from the actual value when measuring the stepped shaft 18 due to adjusting the movable laser head 30 alone.

[0032] Two adjusting bevel gears 33 with axes perpendicular to each other are further disposed inside the housing 27 . One adjusting bevel gear 33 is coaxial with the third spur gear 31 , and the other adjusting bevel gear 33 is fixedly connected to an adjusting column 34 that passes through the housing 27 .

[0033] like Fig. 9 As shown, when measuring the concentricity of the stepped shaft 18, different stepped shafts 18 have different concentricity error requirements. By rotating the adjusting column 34, the adjusting bevel gear 33 drives the third spur gear 31 to rotate. At this time, the third spur gear 31 drives the two racks 32 to move, thereby synchronously adjusting the distance between the two active laser heads 30 and the fixed laser head 28 in the middle, which is convenient for adjusting the detection error range. At the same time, replacing different adjusting bevel gears 33 can achieve that when the adjusting column 34 rotates the same arc, the two active laser heads 30 move different distances, thereby measuring concentricity of different accuracies.

[0034] The inner side surface of the centering frame 21 is provided with a plurality of circular grooves, in which a ball spring frame 25 is slidably connected, and a supporting ball 26 is clamped at the front end of the ball spring frame 25 .

[0035] like Figure 8 As shown, the centering frame 21 consists of two parts, an upper part and an lower part. After the stepped shaft 18 passes through the front end of the mounting frame 17 and the first spur gear 22, the centering frame 21 is clamped on both sides of the stepped shaft 18 and fixed to the front end of the mounting frame 17. The ball spring frame 25 and the supporting balls 26 in the centering frame 21 provide support and centering for the stepped shaft 18, so that the stepped shaft 18 keeps its axis in the same position when it is rotated by the first spur gear 22, thereby preventing the stepped shaft 18 from being displaced during rotation and causing inaccurate concentricity data.

[0036] Among them, the top surface of the shell 2 is fixedly connected to the driving motor 7, and the output shaft of the driving motor 7 is fixedly sleeved with two first bevel gears 8. Two vertical transmission shafts 9 are rotatably installed on the rear side of the back plate 6. The upper ends of the two transmission shafts 9 are respectively sleeved with one-way bearings 10 with opposite locking directions, and the side surfaces of the one-way bearings 10 are sleeved with second bevel gears 11. The other end of the transmission shaft 9 is fixedly sleeved with a third bevel gear 12, and the second bevel gear 11 is meshed with the corresponding first bevel gear 8. The mounting tube 19 and the rotating shaft 20 extending out of the rear side of the back plate 6 are both fixedly sleeved with a fourth bevel gear 13, and the fourth bevel gear 13 is meshed with the adjacent third bevel gear 12.

[0037] like Figures 1 to 6 As shown, when the concentricity of the stepped shaft 18 is measured, the driving motor 7 drives the second bevel gear 11 to rotate through the first bevel gear 8. When the driving motor 7 rotates forward, one of the one-way bearings 10 is locked, while the other one-way bearing 10 rotates freely. At this time, the locked one-way bearing 10 drives the corresponding transmission shaft 9 to rotate, so that the transmission shaft 9 drives the third bevel gear 12 to rotate, and the third bevel gear 12 drives the fourth bevel gear 13 fixedly mounted on the rotating shaft 20 to rotate. At this time, the rotation of the rotating shaft 20 causes the two transmission bevel gears 24 to rotate, thereby driving the second spur gear 23 The second spur gear 23 drives the first spur gear 22 to rotate, thereby rotating the stepped shaft 18 in the first spur gear 22. When the drive motor 7 reverses, the states of the two one-way bearings 10 are switched, and the mounting tube 19 is rotated through transmission, thereby rotating the mounting frame 17. As the mounting frame 17 rotates 180 degrees, the two ends of the stepped shaft 18 turn around. At this time, the transverse linear motor 15 returns, and the laser emitting device 16 measures the other end of the stepped shaft 18. The measurement of the stepped shaft 18 is completed while the transverse linear motor 15 completes the return reset.

[0038] Among them, the driving motor 7 is electrically connected to the control panel 3, the vertical linear motor 14 and the horizontal linear motor 15 are electrically connected to the control panel 3, the laser emitting device 16 is electrically connected to the control panel 3, and a through groove is opened on the top surface of the base 1, and the through groove is located directly below the stepped shaft 18.

[0039] like Figure 2As shown, through the set through slot, after the measurement of one end of the stepped shaft 18 is completed, the mounting frame 17 is controlled to rotate 180°, and then the transverse linear motor 15 drives the laser emitting device 16 to move in the original direction to measure the other end of the stepped shaft 18. After the transverse linear motor 15 moves back to the starting position, not only the concentricity of the stepped shaft 18 is measured, but also the laser emitting device 16 is reset. The setting of the through slot prevents the excessively long stepped shaft 18 from colliding with the base 1 during rotation, causing damage to the stepped shaft 18 and the base 1. At the same time, by setting an exhaust device inside the base 1, the air in the shell 2 is extracted, so that the shell 2 is in a vacuum state, which prevents the air from refracting the light, causing the light signal received by the photosensitive plate 5 to be inconsistent with the real data, resulting in inaccurate actual measurement results.

[0040] Working principle:

[0041] When the present invention is used to measure the concentricity of shaft parts such as the stepped shaft 18, the shaft sleeve is first set in the first spur gear 22 and the mounting frame 17, and then the height of the slider of the vertical linear motor 14 is controlled to make the fixed laser head 28 located at the designed height of the shaft, and then the distance between the two movable laser heads 30 and the fixed laser head 28 is adjusted to make the distance between the movable laser head 30 and the fixed laser head 28 equal to the maximum positive and negative error. At this time, the photosensitive plate 5 will receive the light signal of the uppermost movable laser head 30.

[0042] After the above adjustment is completed, the stator of the transverse linear motor 15 is driven to move toward the mounting bracket 17, and the drive motor 7 is started at the same time, so that the drive motor 7 drives the rotating shaft 20 to rotate. At this time, the rotating shaft 20 drives the stepped shaft 18 to rotate, and then the mover of the transverse linear motor 15 is controlled to move slowly toward the mounting bracket 17. At this time, the laser emitting device 16 will move together with the operation of the transverse linear motor 15, so that the laser emitted by the fixed laser head 28 and the movable laser head 30 will irradiate the photosensitive plate 5. At this time, the number of light signals received on the photosensitive plate 5 is recorded. When one or two light signals are received, it means that the actual size of the part is within the maximum error range. When three light signals are received, it means that the actual size of the part is smaller than the size allowed by the maximum negative error, that is, the part is unqualified. When no light signal is received, it means that the actual size of the part is larger than the size allowed by the maximum positive error, and the part needs to be reprocessed to obtain a part that meets the requirements.

[0043] When the laser emitting device 16 moves to the next section of the stepped shaft 18, the horizontal height of the transverse linear motor 15 is adjusted so that the fixed laser head 28 is located at the designed size of this section of the stepped shaft 18 to continue measuring the stepped shaft 18. After half of the stepped shaft 18 is measured, the drive motor 7 is rotated in the opposite direction to drive the mounting tube 19 and the mounting frame 17 to rotate 180° so that the other half of the stepped shaft 18 is within the detection range. Then, the horizontal height of the transverse linear motor 15 is adjusted, and the drive motor 7 is switched to forward rotation again. As the laser emitting device 16 returns, the stepped shaft 18 is measured at the same time. When the concentricity of the stepped shaft 18 is measured, the laser emitting device 16 returns to the starting position. At this time, the stepped shaft 18 can be replaced to measure subsequent workpieces.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A concentricity measuring device, comprising a base (1) and a housing (2) fixedly connected thereto, wherein a control panel (3) is arranged on the front side of the housing (2), and a closed door (4) is hingedly connected to one side thereof, characterized in that: The top surface of the base (1) is fixedly connected to a back plate (6); the inner side surface of the shell (2) relative to the back plate (6) is fixedly connected to a photosensitive plate (5); the front side surface of the back plate (6) is fixedly provided with two vertical linear motors (14); the movers of the two vertical linear motors (14) are fixedly connected to a horizontal linear motor (15); the movers of the horizontal linear motor (15) are fixedly connected to a laser emitting device (16); the front side surface of the back plate (6) is rotatably mounted with a mounting tube (19); the front end of the mounting tube (19) is fixedly mounted to the back plate (6). A mounting frame (17) is fixedly connected, a rotating shaft (20) is rotatably mounted inside the mounting frame (17), a centering frame (21) is fixedly connected to the front end of the mounting frame (17), a first spur gear (22) is abutted against the side of the centering frame (21), a second spur gear (23) is rotatably mounted inside the mounting frame (17), a side of the second spur gear (23) and one end of the rotating shaft (20) are fixedly connected with mutually meshing transmission bevel gears (24), and a stepped shaft (18) is fixedly sleeved inside the centering frame (21).

2. A concentricity measuring device according to claim 1, characterized in that: The laser emitting device (16) comprises a housing (27) and a fixed laser head (28) fixedly connected to the center of the front side thereof; a first sliding groove (29) symmetrical in upper and lower directions is provided inside the housing (27); a movable laser head (30) is slidably connected inside the first sliding groove (29); a rack (32) is fixedly connected to the rear side of the movable laser head (30); a third spur gear (31) is provided inside the housing (27); the third spur gear (31) is meshed with the rack (32).

3. A concentricity measuring device according to claim 2, characterized in that: Two adjusting bevel gears (33) with axes perpendicular to each other are also arranged inside the housing (27); one of the adjusting bevel gears (33) is coaxial with the third spur gear (31); and the other adjusting bevel gear (33) is fixedly connected to an adjusting column (34) penetrating the housing (27).

4. A concentricity measuring device according to claim 3, characterized in that: The inner side surface of the centering frame (21) is provided with a plurality of circular grooves, a ball spring frame (25) is slidably connected in the circular groove, and a supporting ball (26) is clamped at the front end of the ball spring frame (25).

5. A concentricity measuring device according to claim 4, characterized in that: The top surface of the housing (2) is fixedly connected to a driving motor (7), the output shaft of the driving motor (7) is fixedly sleeved with two first bevel gears (8), the rear side surface of the back plate (6) is rotatably mounted with two vertical transmission shafts (9), the upper ends of the two transmission shafts (9) are respectively sleeved with one-way bearings (10) with opposite locking directions, the side surfaces of the one-way bearings (10) are sleeved with second bevel gears (11), the other end of the transmission shaft (9) is fixedly sleeved with a third bevel gear (12), and the second bevel gear (11) is meshed with the corresponding first bevel gear (8).

6. A concentricity measuring device according to claim 5, characterized in that: The mounting tube (19) and the rotating shaft (20) extending out of the rear side of the back plate (6) are both fixedly sleeved with a fourth bevel gear (13), and the fourth bevel gear (13) is meshed with the adjacent third bevel gear (12).

7. A concentricity measuring device according to claim 6, characterized in that: The driving motor (7) is electrically connected to the control panel (3), the vertical linear motor (14) and the horizontal linear motor (15) are electrically connected to the control panel (3), and the laser emitting device (16) is electrically connected to the control panel (3).

8. A concentricity measuring device according to claim 7, characterized in that: A through slot is provided on the top surface of the base (1), and the through slot is located directly below the stepped shaft (18).

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