A high-precision coaxiality detection device for automobile steering columns

Abstract

The present invention relates to the technical field of coaxiality detection, and specifically to a high-precision coaxiality detection device for automobile steering columns, comprising a detection platform, wherein an adjustment unit is provided on the top of the detection platform, and a detection unit is slidably connected to the middle of the top of the adjustment unit, and the detection unit is used to detect coaxiality; a clamping unit is placed in the middle of the top of the detection platform, and the clamping unit includes a clamping platform; in the present invention, when the clamping plate clamps the steering column, the conductive contact will contact the steering column, and at this time, the conductive contact is energized, so that the current can enter the steering column through the conductive contact, and when the steering column is tilted, it will cause the upper or lower conductive contacts to be unable to contact the steering column. At this time, the position and angle of the steering column can be understood by the number and position of the conductive contacts that are turned on, so that the steering column can be detected before the coaxiality is detected, so as to reduce the occurrence of the situation where the detection head is broken due to the detection when the steering column is tilted.

Description

Technical Field

[0001] The invention relates to the technical field of coaxiality detection, in particular to a high-precision coaxiality detection device for an automobile steering column. Background Art

[0002] The steering system directly affects vehicle handling. If the steering column is not coaxial, it may cause steering stiffness or jamming, increasing the risk of accidents. Testing the coaxiality of the vehicle's steering column is a key step in ensuring the safety and reliability of the steering system. High-precision testing (such as laser measurement or three-dimensional coordinate measuring) can ensure that the geometric centers of the various axis sections of the steering column and connecting components are strictly aligned to meet design tolerance requirements. This not only ensures the immediate responsiveness of the steering system, but also extends the service life of core components. It is an indispensable quality control link in automobile manufacturing and maintenance.

[0003] Considering that when performing high-precision coaxiality testing on the steering column, the clamping process may cause the clamping to tilt due to instability, the coaxiality detection head may be subjected to uneven force on different surfaces during the test, which may cause the detection head to be subjected to excessive force and break. At the same time, the existing clamping usually uses a three-jaw chuck to clamp the steering column. Since the clamping area of the three-jaw chuck and the steering column is small, when clamping a larger steering column, the clamping force of the three-jaw chuck is increased to make the clamping more stable. When the clamping force is increased, the surface of the steering column may be damaged. Summary of the Invention

[0004] The object of the present invention is to provide a high-precision coaxiality detection device for an automobile steering column to solve the problems raised in the above background technology.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention is a high-precision coaxiality detection device for an automobile steering column, comprising a detection platform, an adjustment unit provided on the top of the detection platform, a detection unit slidably connected to the middle of the top of the adjustment unit, and the detection unit is used to detect coaxiality;

[0007] A clamping unit is placed in the middle of the top of the detection platform, and the clamping unit includes a clamping platform. The outer wall of the clamping platform near the bottom is fixedly connected to the power transmission end, and the top surface of the clamping platform is provided with three sliding grooves; the sliding grooves are slidably connected to the clamping claws, and the sides of the clamping claws that are close to each other are provided with grooves; the grooves are fixedly connected to the clamping plate, and the surface of the clamping plate away from the clamping claws is arrayed with multiple conductive contacts.

[0008] Furthermore, a rectangular groove is provided in the middle of the top of the clamping platform, an electromagnetic base is installed in the rectangular groove, a plurality of electromagnetic holes are evenly provided on the top surface of the electromagnetic base, and a detection hole is provided in the middle of the top surface of the electromagnetic base; the aperture of the detection hole is larger than that of the electromagnetic hole, and a magnet is slidably connected between the detection hole and the electromagnetic hole.

[0009] Furthermore, three lifting grooves are provided on the circumferential surface of the clamping platform close to the clamping jaws, and limiting grooves are provided on the outer walls on both sides of the clamping jaws located in the sliding groove. The limiting blocks are slidably connected in the limiting grooves, and the bottom of the clamping jaws is slidably connected with an adjustment block; the adjustment block is fixedly connected to the limiting block, and a lifting block is fixedly connected to the side of the adjustment block close to the clamping platform, and the lifting block is slidably connected to the lifting grooves.

[0010] Furthermore, three adjustment grooves are provided on the circumferential surface of the clamping platform, and adjustment plates are slidably connected in the adjustment grooves. The adjustment plates are slidably connected to the circumferential surface of the clamping platform, and the top surfaces at both ends of the clamping plates are in contact with the bottom of the adjustment block. A manual adjustment rod is fixedly connected to the top of the middle part of the clamping plate.

[0011] Furthermore, the outer wall of the clamping platform near the bottom is fixedly connected to two support plates, the support plates and the top of the power transmission end are fixedly connected to a first motor, the output end of the first motor is fixedly connected to a first screw, and the first screw is sleeved with the adjustment block;

[0012] The clamping platform is located at the top of the adjustment slot and is fixedly connected to three second motors. The output ends of the second motors are all fixedly connected to second screws, and the second screws are sleeved with the adjustment plate.

[0013] Furthermore, the bottoms of the two clamping plates are fixedly connected with triangular stoppers, and the bottom of one clamping plate is fixedly connected with a planar stopper, and a rectangular clamping is formed between the triangular stopper and the planar stopper.

[0014] Furthermore, the surfaces of the clamping jaws on one side that are close to each other are fixedly connected with a flexible pad, and the thickness of the flexible pad is thicker than the conductive contact.

[0015] Furthermore, a card slot is provided at the bottom of the clamping platform, and an electromagnetic suction cup is fixedly connected in the card slot.

[0016] The present invention has the following beneficial effects:

[0017] 1. In the present invention, when the clamping plate clamps the steering column, the conductive contacts will contact the steering column. At this time, the conductive contacts are energized, allowing current to enter the steering column through the conductive contacts. When the steering column is tilted, the upper or lower conductive contacts will not be able to contact the steering column. At this time, the position and angle of the steering column can be understood by the number and position of the conductive contacts that are turned on, so that the steering column can be tested before the coaxiality is tested to reduce the possibility of the detection head breaking due to the detection when the steering column is tilted.

[0018] 2. While the conductive contacts detect the steering column, the present invention also uses an electromagnetic base to generate a magnetic field when the steering column becomes conductive. When the magnetic field is generated, it will produce an attractive or repulsive force on the magnet (depending on the direction of the magnetic pole). When the magnet moves through the magnetic field, its movement distance is recorded. By calculating the distance moved by each magnet, the angle and height of the steering column offset are understood. At this time, the data is cross-verified with the data recorded by the conductive contacts, thereby improving the accuracy and precision of the data.

[0019] 3. In the present invention, when the steering column is tilted, since the steering column is tilted when clamped, the tilt angle of the steering column can be adjusted by adjusting the height of the clamping claws. After adjustment, the magnet and conductive contacts of the electromagnetic base are used to detect whether the steering column is tilted again. When the steering column is relatively parallel to the clamping platform, the coaxiality detection operation is performed; thereby, the adjustment accuracy is higher, thereby reducing the tilt amplitude of the steering column, thereby reducing the measurement error caused by the tilt, and also reducing the breakage caused by excessive force on the detection head. Not only can the error be reduced, but the service life of the detection head can also be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic structural diagram of the clamping unit of the present invention;

[0023] Figure 3 This is a schematic diagram of the bottom structure of the clamping unit of the present invention;

[0024] Figure 4 is a cross-sectional view of the clamping unit of the present invention;

[0025] Figure 5 This is an exploded view of the clamping unit of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of the clamping jaws of the present invention;

[0027] Figure 7 This is a structural diagram of the adjustment plate of the present invention.

[0028] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0029] In the figure: 1. detection platform; 11. adjustment unit; 12. detection unit; 2. clamping unit; 21. clamping platform; 211. sliding slot; 212. card slot; 213. adjustment slot; 214. support plate; 215. transmission end; 22. clamping claw; 221. limit slot; 222. triangular block; 223. plane block; 224. flexible pad; 23. clamping plate; 231. conductive contact; 24. electromagnetic base; 25. first motor; 251. first screw; 252. adjustment block; 253. limit block; 254. lifting block; 26. adjustment plate; 261. manual adjustment rod; 262. second motor; 263. second screw; 27. electromagnetic suction cup. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0031] See also Figure 1-Figure 7 As shown, the present invention is a high-precision coaxiality detection device for automobile steering columns, comprising a detection platform 1, an adjustment unit 11 being provided on the top of the detection platform 1, a detection unit 12 being slidably connected to the middle of the top of the adjustment unit 11, and the detection unit 12 being used to detect coaxiality;

[0032] A clamping unit 2 is placed in the middle of the top of the detection platform 1, and the clamping unit 2 includes a clamping platform 21. The outer wall of the clamping platform 21 near the bottom is fixedly connected to the power transmission end 215, and the top surface of the clamping platform 21 is provided with three sliding grooves 211; the sliding grooves 211 are slidingly connected to the clamping claws 22, and the sides of the clamping claws 22 that are close to each other are provided with grooves; the grooves are fixedly connected to the clamping plate 23, and the surface of the clamping plate 23 away from the clamping claws 22 is arrayed with multiple conductive contacts 231.

[0033] In this embodiment, it is considered that when performing high-precision coaxiality testing on a steering column, the clamping process may cause the clamping to tilt due to instability. During the test, the coaxiality detection head may be subjected to uneven force on different surfaces, which may cause the detection head to be subjected to excessive force and break. At the same time, the existing clamping usually uses a three-jaw chuck to clamp the steering column. Since the clamping area of the three-jaw chuck and the steering column is small, when clamping a large steering column, the clamping force of the three-jaw chuck is increased to ensure more stable clamping. When the clamping force is increased, the surface of the steering column may be damaged.

[0034] When clamping the steering column, the steering column is first placed on the clamping platform 21, and the three clamping jaws 22 move inward to clamp the steering column. When the clamping jaws 22 move inward, the clamping plates 23 move inward. When the clamping plates 23 come into contact with the steering column, they clamp it. Since the clamping plates 23 have a larger clamping area, they can have higher stability when clamping larger steering columns, thereby preventing the steering column from tilting when clamped.

[0035] When the clamping plate 23 clamps the steering column, the conductive contact 231 will contact the steering column. At this time, the conductive contact 231 is energized, allowing current to enter the steering column through the conductive contact 231. When the steering column is tilted, the upper or lower conductive contact 231 will be unable to contact the steering column. At this time, the position and angle of the steering column can be understood by the number and position of the conductive contacts 231 that are turned on, so as to detect the steering column before detecting the coaxiality, so as to reduce the occurrence of the detection head breaking due to detection when the steering column is tilted.

[0036] Specifically, a rectangular groove is provided in the middle of the top of the clamping platform 21, an electromagnetic base 24 is installed in the rectangular groove, a plurality of electromagnetic holes are evenly provided on the top surface of the electromagnetic base 24, and a detection hole is provided in the middle of the top surface of the electromagnetic base 24; the aperture of the detection hole is larger than that of the electromagnetic hole, and a magnet is slidably connected between the detection hole and the electromagnetic hole.

[0037] In this embodiment, the accuracy of measuring the position and angle of the steering column by only the number and position of the conductive contacts 231 that are energized is low. Since the conductive contacts 231 cannot be arranged too densely, the conductive contacts 231 may not be able to detect when the steering column is only slightly tilted.

[0038] While the conductive contact 231 is detecting the steering column, the electromagnetic base 24 is set up. When the steering column becomes conductive, a magnetic field is generated. When the magnetic field is generated, it will produce an attractive or repulsive force on the magnet (depending on the direction of the magnetic pole). When the magnet moves through the magnetic field, its movement distance is recorded. By calculating the distance moved by each magnet, the angle and height of the steering column offset are understood. At this time, the data is cross-verified with the data recorded by the conductive contact 231, thereby improving the accuracy and precision of the data.

[0039] Specifically, three lifting grooves are provided on the circumferential surface of the clamping platform 21 close to the clamping jaw 22, and limiting grooves 221 are provided on the outer walls on both sides of the clamping jaw 22 located in the sliding groove 211. The limiting block 253 is slidably connected in the limiting groove 221, and the bottom of the clamping jaw 22 is slidably connected with an adjustment block 252; the adjustment block 252 is fixedly connected to the limiting block 253, and the side of the adjustment block 252 close to the clamping platform 21 is fixedly connected with a lifting block 254, and the lifting block 254 is slidably connected to the lifting groove.

[0040] In this embodiment, it is considered that the angle of the steering column needs to be adjusted after the steering column is tilted. However, during the adjustment process, the steering column needs to be clamped repeatedly. After multiple clamping, debris may be generated on the steering column or the clamping jaws 22 due to repeated friction. Since the steering column is subjected to high-precision inspection, when debris adheres to the surface of the steering column, it may cause errors in the inspection results, thereby reducing the inspection accuracy.

[0041] When the steering column is tilted, since the steering column is tilted when clamped, the tilt angle of the steering column can be adjusted by adjusting the height of the clamping jaws 22. After adjustment, the magnet of the electromagnetic base 24 and the conductive contact 231 are used to detect whether the steering column is tilted again. When the steering column is relatively parallel to the clamping platform 21, a coaxiality detection operation is performed.

[0042] Specifically, three adjustment grooves 213 are provided on the circumferential surface of the clamping platform 21, and adjustment plates 26 are slidably connected in the adjustment grooves 213. The adjustment plates 26 are slidably connected to the circumferential surface of the clamping platform 21, and the top surfaces at both ends of the clamping plate 23 are in contact with the bottom of the adjustment block 252. The top of the middle part of the clamping plate 23 is fixedly connected to a manual adjustment rod 261.

[0043] In this embodiment, when the steering column is tilted to a specific angle, the two clamping jaws 22 need to be adjusted at the same time. At this time, the adjustment plate 26 can be adjusted by pulling the manual adjustment rod 261. Since the two ends of the adjustment plate 26 are in contact with the adjustment block 252, when the adjustment plate 26 rises or falls, it will drive the two adjustment blocks 252 to move at the same time. At this time, the angle of the steering column can be adjusted between the two adjustment blocks 252, and the position of the adjustment block 252 can be adjusted again after the adjustment. This makes the adjustment more accurate, thereby reducing the tilt amplitude of the steering column, thereby reducing the measurement error caused by the tilt, and also reducing the breakage caused by excessive force on the detection head. Not only can the error be reduced, but the service life of the detection head can also be increased.

[0044] Specifically, the outer wall of the clamping platform 21 near the bottom is fixedly connected to two support plates 214. The top of the support plate 214 and the power transmission end 215 are fixedly connected to a first motor 25. The output end of the first motor 25 is fixedly connected to a first screw 251, which is sleeved with an adjustment block 252.

[0045] The clamping platform 21 is located at the top of the adjustment slot 213 and is fixedly connected to three second motors 262 . The output ends of the second motors 262 are all fixedly connected to second screws 263 , and the second screws 263 are sleeved with the adjustment plate 26 .

[0046] In this embodiment, it is considered that when manually adjusting the tilt error of the steering column, adjustment errors often occur and repeated adjustments are required, which is not only time-consuming but also requires specialized personnel to perform the adjustments. In addition, manual adjustment may cause debris such as dandruff to be scattered and adhere to the surface of the steering column, which may cause errors in the detection results.

[0047] When the steering column is tilted, the first motor 25 is started to drive the first screw 251 to rotate. When the first screw 251 rotates, the adjustment block 252 drives the lifting block 254 to slide in the lifting slot. When the adjustment block 252 rises, it drives the limit block 253 to move upward, and drives the clamping claw 22 to move upward; when a specific angle needs to be adjusted, the second motor 262 is started to drive the second screw 263 to rotate. When the second screw 263 rotates, the adjustment plate 26 can move. Since the two ends of the adjustment plate 26 are in contact with the adjustment block 252, the adjustment plate 26 can adjust the angle between the two adjustment blocks 252. Adjusting the movement of the adjustment block 252 by the motor can reduce the error during adjustment and reduce the time consumed by repeatedly adjusting the steering column.

[0048] Specifically, the bottoms of the two clamping plates 23 are fixedly connected with triangular stoppers 222 , and the bottom of one clamping plate 23 is fixedly connected with a planar stopper 223 , and a rectangular clamping is formed between the triangular stopper 222 and the planar stopper 223 .

[0049] In this embodiment, considering that some steering columns are installed with a rectangular base to ensure the stability of placement, when the three clamping jaws 22 clamp the rectangle, the rectangle will be offset. At this time, measurement errors may occur when the coaxiality test of the steering column is performed, and the coaxiality test head may be damaged due to excessive force.

[0050] When the steering column is installed with a rectangular base, the electromagnetic base 24 is first removed and the rectangular base is placed in the slot 212. At this time, through the setting of the triangular stopper 222 and the flat stopper 223, when the three clamping claws 22 are clamped, the triangular stopper 222 and the flat stopper 223 will contact the rectangular base, thereby clamping the rectangular base. By clamping the rectangular base, the offset of the rectangular base can be reduced, thereby increasing the accuracy of detection.

[0051] Specifically, the adjacent side surfaces of the clamping jaws 22 are fixedly connected with flexible pads 224 , and the thickness of the flexible pads 224 is thicker than the conductive contacts 231 .

[0052] In this embodiment, the setting of the flexible pad 224 allows the clamping jaw 22 to deform and fit when clamping the steering column. At this time, the flexible pad 224 can completely wrap the steering column, thereby obtaining a larger clamping area and friction force to increase the clamping stability. Since the thickness of the flexible pad 224 is thicker than the conductive shock, the flexible pad 224 is first completely wrapped around the steering column during clamping before testing. This can make the steering column more stable during testing, thereby increasing the detection accuracy.

[0053] Specifically, a clamping slot 212 is formed at the bottom of the clamping platform 21 , and an electromagnetic suction cup 27 is fixedly connected in the clamping slot 212 .

[0054] In this embodiment, considering that the clamping unit 2 is usually fixed with bolts or the like in the prior art, it needs to be repeatedly disassembled and assembled when clamping different workpieces. If the bolts are fixed too many times, they may cause thread slippage and fail to be completely fixed. This may cause the clamping unit 2 to be unstable and affect the accuracy of the detection.

[0055] The electromagnetic suction cup 27 can be energized when fixed and adsorbed on the detection platform 1. When the position of the clamping unit 2 deviates, the voltage of the electromagnetic suction cup 27 can be reduced, thereby reducing the adsorption force of the electromagnetic suction cup 27 and adjusting the position by pushing the clamping unit 2. Due to the existence of partial suction, it can prevent the pushing force from being too large and causing the moving distance to be too large. When the clamping unit 2 is located at the center of the detection platform 1, the time consumed for positioning can be reduced.

[0056] During use, first, when clamping the steering column, the steering column is placed on the clamping platform 21. The electromagnetic suction cup 27 can be energized when fixed and adsorbed on the detection platform 1. When the position of the clamping unit 2 deviates, the voltage of the electromagnetic suction cup 27 can be reduced, thereby reducing the adsorption force of the electromagnetic suction cup 27, and the position can be adjusted by pushing the clamping unit 2. Due to the existence of partial suction, it can prevent the pushing force from being too large and causing the moving distance to be too large. When the clamping unit 2 is located at the center of the detection platform 1, the time consumed for positioning can be reduced;

[0057] When the position of the clamping unit 2 is fixed, the three clamping jaws 22 move inward to clamp the steering column. When the clamping jaws 22 move inward, the clamping plate 23 moves inward. When the clamping plate 23 contacts the steering column, it clamps it. Since the clamping plate 23 has a larger clamping area, it can have higher stability when clamping a larger steering column, thereby preventing the steering column from tilting when clamped.

[0058] When the clamping plate 23 clamps the steering column, the conductive contacts 231 come into contact with the steering column. At this time, the conductive contacts 231 are energized, allowing current to enter the steering column through the conductive contacts 231. When the steering column is tilted, the upper or lower conductive contacts 231 cannot contact the steering column. At this time, the position and angle of the steering column can be understood by the number and position of the conductive contacts 231 that are conductive. Therefore, the steering column can be tested before the coaxiality test to reduce the possibility of the test head breaking when the steering column is tilted.

[0059] While the conductive contact 231 is detecting the steering column, the electromagnetic base 24 is set up. When the steering column becomes conductive, a magnetic field is generated. When the magnetic field is generated, it will produce an attractive or repulsive force on the magnet depending on the direction of the magnetic pole. When the magnet moves through the magnetic field, its movement distance is recorded. By calculating the distance moved by each magnet, the angle and height of the steering column offset are understood. At this time, the data is cross-verified with the data recorded by the conductive contact 231, thereby improving the accuracy and precision of the data.

[0060] Secondly, when the steering column is tilted, since the steering column is tilted when clamped, the tilt angle of the steering column can be adjusted by adjusting the height of the clamping jaws 22. After adjustment, the magnet of the electromagnetic base 24 and the conductive contact 231 are used to detect whether the steering column is tilted again. When the steering column and the clamping platform 21 are relatively parallel, the coaxiality detection operation is performed;

[0061] When the steering column is tilted to a specific angle, the two clamping jaws 22 need to be adjusted at the same time. At this time, the adjustment plate 26 can be adjusted by pulling the manual adjustment rod 261. Since the two ends of the adjustment plate 26 are in contact with the adjustment block 252, when the adjustment plate 26 rises or falls, it will drive the two adjustment blocks 252 to move at the same time. At this time, the angle of the steering column can be adjusted between the two adjustment blocks 252, and the position of the adjustment block 252 can be adjusted again after the adjustment. This makes the adjustment more accurate, thereby reducing the tilt of the steering column, thereby reducing the measurement error caused by the tilt, and also reducing the breakage caused by excessive force on the detection head. This not only reduces the error but also increases the service life of the detection head.

[0062] When the steering column is tilted, the first motor 25 is started to drive the first screw 251 to rotate. When the first screw 251 rotates, the adjustment block 252 drives the lifting block 254 to slide in the lifting slot. When the adjustment block 252 rises, it drives the limit block 253 to move upward, and drives the clamping claw 22 to move upward; when a specific angle needs to be adjusted, the second motor 262 is started to drive the second screw 263 to rotate. When the second screw 263 rotates, the adjustment plate 26 can move. Since the two ends of the adjustment plate 26 are in contact with the adjustment block 252, the adjustment plate 26 can adjust the angle between the two adjustment blocks 252. Adjusting the movement of the adjustment block 252 by the motor can reduce the error during adjustment and reduce the time consumed by repeatedly adjusting the steering column.

[0063] Finally, when the steering column is installed with a rectangular base, the electromagnetic base 24 is first removed and the rectangular base is placed in the slot 212. At this time, due to the arrangement of the triangular stopper 222 and the flat stopper 223, when the three clamping jaws 22 are clamping, the triangular stopper 222 and the flat stopper 223 will contact the rectangular base, thereby clamping the rectangular base. By clamping the rectangular base, the deviation of the rectangular base can be reduced, thereby increasing the accuracy of the detection.

[0064] By setting the flexible pad 224, the clamping jaw 22 can deform and fit when clamping the steering column. At this time, the flexible pad 224 can completely wrap the steering column, thereby obtaining a larger clamping area and friction force to increase the clamping stability. Since the thickness of the flexible pad 224 is thicker than the conductive contact, the flexible pad 224 is first completely wrapped around the steering column during clamping before testing. This can make the steering column more stable during testing to increase the detection accuracy.

[0065] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high-precision coaxiality detection device for an automobile steering column, comprising a detection platform (1), an adjustment unit (11) being provided on the top of the detection platform (1), a detection unit (12) being slidably connected to the middle of the top of the adjustment unit (11), and the detection unit (12) being used to detect coaxiality; characterized in that: A clamping unit (2) is placed in the middle of the top of the detection platform (1), and the clamping unit (2) includes a clamping platform (21), and the outer wall of the clamping platform (21) near the bottom is fixedly connected to a power transmission end (215), and the top surface of the clamping platform (21) is provided with three sliding grooves (211); a clamping claw (22) is slidably connected in the sliding groove (211), and a groove is provided on each side of the clamping claw (22) close to each other; a clamping plate (23) is fixedly connected in the groove, and a plurality of conductive contacts (231) are arrayed on the surface of the clamping plate (23) away from the clamping claw (22); A rectangular groove is provided in the middle of the top of the clamping platform (21), an electromagnetic base (24) is installed in the rectangular groove, a plurality of electromagnetic holes are evenly provided on the top surface of the electromagnetic base (24), and a detection hole is provided in the middle of the top surface of the electromagnetic base (24); the aperture of the detection hole is larger than that of the electromagnetic hole, and a magnet is slidably connected between the detection hole and the electromagnetic hole.

2. The high-precision coaxiality detection device for an automobile steering column according to claim 1, characterized in that: The clamping platform (21) is provided with three lifting grooves on a circumferential surface close to the clamping claw (22); the outer walls of both sides of the clamping claw (22) located in the sliding groove (211) are provided with limiting grooves (221); the limiting block (253) is slidably connected in the limiting groove (221); the bottom of the clamping claw (22) is slidably connected with an adjusting block (252); the adjusting block (252) is fixedly connected to the limiting block (253); a lifting block (254) is fixedly connected to one side of the adjusting block (252) close to the clamping platform (21); the lifting block (254) is slidably connected to the lifting grooves.

3. The high-precision coaxiality detection device for an automobile steering column according to claim 2, characterized in that: The circumferential surface of the clamping platform (21) is provided with three adjustment grooves (213), and the adjustment grooves (213) are slidably connected with adjustment plates (26). The adjustment plates (26) are slidably connected to the circumferential surface of the clamping platform (21), and the top surfaces of both ends of the clamping plate (23) are in contact with the bottom of the adjustment block (252). The top of the middle part of the clamping plate (23) is fixedly connected with a manual adjustment rod (261).

4. The high-precision coaxiality detection device for an automobile steering column according to claim 3, characterized in that: Two support plates (214) are fixedly connected to the outer wall of the clamping platform (21) near the bottom, and the top of the support plate (214) and the power transmission end (215) are fixedly connected to a first motor (25), and the output end of the first motor (25) is fixedly connected to a first screw (251), and the first screw (251) is sleeved with an adjustment block (252); The clamping platform (21) is located at the top of the adjustment slot (213) and is fixedly connected to three second motors (262). The output ends of the second motors (262) are all fixedly connected to second screws (263), and the second screws (263) are sleeved with the adjustment plate (26).

5. The high-precision coaxiality detection device for an automobile steering column according to claim 1, characterized in that: The bottoms of the two clamping plates (23) are fixedly connected with triangular stoppers (222), and the bottom of one clamping plate (23) is fixedly connected with a plane stopper (223), and a rectangular clamping is formed between the triangular stopper (222) and the plane stopper (223).

6. The high-precision coaxiality detection device for an automobile steering column according to claim 1, characterized in that: The adjacent side surfaces of the clamping jaws (22) are both fixedly connected with flexible pads (224), and the thickness of the flexible pads (224) is thicker than the conductive contacts (231).

7. The high-precision coaxiality detection device for an automobile steering column according to claim 1, characterized in that: A clamping slot (212) is provided at the bottom of the clamping platform (21), and an electromagnetic suction cup (27) is fixedly connected in the clamping slot (212).

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