High-precision coaxiality detection device for automobile steering column

Abstract

The invention relates to the technical field of coaxiality detection, in particular to an automobile steering column high-precision coaxiality detection device which comprises a detection platform, the top of the detection platform is provided with an adjusting unit, the middle of the top of the adjusting unit is slidably connected with a detection unit, and the detection unit is used for detecting the coaxiality; a clamping unit is placed in the middle of the top of the detection platform and comprises a clamping platform; after the steering column is clamped by the clamping plate, the conductive contacts can make contact with the steering column, the conductive contacts are powered on at the moment, current can enter the steering column through the conductive contacts, and when the steering column inclines, the conductive contacts on the upper portion or the lower portion cannot make contact with the steering column; at the moment, the position and the angle of the steering column can be known through the number and the position of conduction of the conductive contacts, so that the steering column is detected before the coaxiality is detected, and the situation that the detection head is broken due to detection when the steering column inclines is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of coaxiality detection, and particularly to a high-precision coaxiality detection device for an automotive steering column. Background Technique

[0002] The steering system directly affects the vehicle's handling. If the steering column is not coaxial, it may lead to inflexible steering or jamming, increasing the risk of accidents. Conducting coaxiality detection on the automotive steering column is a crucial link to ensure the safety and reliability of the steering system. Through high-precision detection (such as laser measurement or coordinate measuring machine), it can ensure that the axis of each section of the steering column and the geometric centers of the connecting components are strictly aligned, meeting the design tolerance requirements. This not only guarantees the immediate response ability of the steering system but also extends the service life of the core components, and is an indispensable quality control link in automotive manufacturing and maintenance; Considering that during the high-precision coaxiality detection of the steering column, the clamping process may cause the clamping to tilt due to unstable placement, and during the detection, the coaxiality detection head may be unevenly stressed on different surfaces, resulting in excessive stress on the detection head and causing it to break. At the same time, the existing clamping usually uses a three-jaw chuck or the like to clamp the steering column. Since the clamping area between the three-jaw chuck and the steering column is small, when clamping a larger steering column, in order to make the clamping more stable, the clamping force of the three-jaw chuck will be increased. When the clamping force is increased, it may cause damage to the surface of the steering column. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-precision coaxiality detection device for an automotive steering column to solve the problems raised in the above background technique.

[0004] To solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a high-precision coaxiality detection device for an automotive steering column, including a detection platform. A regulating unit is arranged on the top of the detection platform, and a detection unit is slidably connected to the middle of the top of the regulating unit. The detection unit is used for detecting coaxiality; A clamping unit is placed in the middle of the top of the detection platform. The clamping unit includes a clamping platform. An electricity transmission end is fixedly connected to the outer wall of the clamping platform near the bottom. Three sliding grooves are opened on the top surface of the clamping platform; A clamping jaw is slidably connected in the sliding groove, and grooves are opened on the sides of the clamping jaws close to each other; A clamping plate is fixedly connected in the groove, and a plurality of conductive contacts are arrayed on the surface of the clamping plate away from the clamping jaw.

[0005] Further, a rectangular groove is formed 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 formed in the top surface of the electromagnetic base. A detection hole is formed 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. A magnet is slidably connected in the detection hole and the electromagnetic hole.

[0006] Further, three lifting grooves are formed in the circumferential surface of the clamping platform close to the clamping jaw. Limiting grooves are formed in the outer walls on both sides of the clamping jaw located in the sliding groove. A limiting block is slidably connected in the limiting groove. The bottom of the clamping jaw is slidably connected with an adjusting block. The adjusting block is fixedly connected with the limiting block. A lifting block is fixedly connected to one side of the adjusting block close to the clamping platform. The lifting block is slidably connected with the lifting groove.

[0007] Further, three adjusting grooves are formed in the circumferential surface of the clamping platform. An adjusting plate is slidably connected in each adjusting groove. The adjusting plate is also slidably connected with the circumferential surface of the clamping platform. The top surfaces at both ends of the clamping plate are in contact with the bottom of the adjusting block. Manual adjusting rods are fixedly connected to the tops of the middle parts of the clamping plates.

[0008] Further, two supporting plates are fixedly connected to the outer wall of the clamping platform close to the bottom. First motors are fixedly connected to the tops of the supporting plates and the power transmission ends. A first screw rod is fixedly connected to the output end of the first motor. The first screw rod is sleeved with the adjusting block. Three second motors are fixedly connected to the top of the clamping platform located in the adjusting groove. Second screw rods are fixedly connected to the output ends of the second motors. The second screw rods are sleeved with the adjusting plates.

[0009] Further, triangular stoppers are fixedly connected to the bottoms of the two clamping plates. A flat stopper is fixedly connected to the bottom of one clamping plate. A rectangular clamping is formed between the triangular stopper and the flat stopper.

[0010] Further, flexible pads are fixedly connected to the surfaces of the clamping jaws close to each other. The thickness of the flexible pad is thicker than that of the conductive contact point.

[0011] Further, a clamping groove is formed in the bottom of the clamping platform. An electromagnetic chuck is fixedly connected in the clamping groove.

[0012] The present invention has the following beneficial effects: 1. After the clamping plate clamps the steering column in the present invention, the conductive contacts will come into contact with the steering column. At this time, when the conductive contacts are energized, current can enter the steering column through the conductive contacts. When the steering column is tilted, the upper or lower conductive contacts may not be able to contact the steering column. At this time, the position and angle of the steering column can be understood through the number and position of the conductive contacts that are conducting, so as to detect the steering column before detecting the coaxiality, reducing the occurrence of the detection head breaking during detection when the steering column is tilted.

[0013] 2. While the conductive contacts detect the steering column in the present invention, through the setting of the electromagnetic base, when the steering column becomes conductive, a magnetic field will be generated. When the magnetic field is generated, it will exert an attractive or repulsive force on the magnet (depending on the magnetic pole direction). When the magnet moves through the magnetic field, its moving distance will be recorded, and by calculating the moving distance of each magnet, the offset angle and height of the steering column can be understood. At this time, cross-verification is performed with the data recorded by the conductive contacts, thereby improving the accuracy and precision of the data.

[0014] 3. When the steering column is tilted, since it is tilted when being clamped, at this time, the tilt angle of the steering column can be adjusted by adjusting the height of the clamping jaws, and after adjustment, the magnet of the electromagnetic base and the conductive contacts are used to detect again whether the steering column is tilted. When the steering column is relatively parallel to the clamping platform, the coaxiality detection operation is performed; thereby making the adjustment more accurate, reducing the tilt amplitude of the steering column, reducing the measurement error caused by the tilt, and also reducing the fracture caused by the excessive force on the detection head. It can not only reduce errors but also increase the service life of the detection head. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the clamping unit of the present invention; Figure 3 It is a schematic diagram of the bottom structure of the clamping unit of the present invention; Figure 4 It is a sectional view of the clamping unit of the present invention; Figure 5 It is an exploded view of the clamping unit of the present invention; Figure 6 It is a schematic diagram of the structure at the clamping jaws of the present invention; Figure 7This is a schematic structural diagram of the adjusting plate of the present invention.

[0017] In the drawings, the list of components represented by each reference numeral is as follows: In the figure: 1. Detection platform; 11. Adjusting unit; 12. Detection unit; 2. Clamping unit; 21. Clamping platform; 211. Sliding groove; 212. Card slot; 213. Adjusting groove; 214. Support plate; 215. Power transmission end; 22. Jaw; 221. Limit groove; 222. Triangular stop; 223. Flat stop; 224. Flexible pad; 23. Clamping plate; 231. Conductive contact; 24. Electromagnetic base; 25. First motor; 251. First screw; 252. Adjusting block; 253. Limit block; 254. Lifting block; 26. Adjusting plate; 261. Manual adjusting rod; 262. Second motor; 263. Second screw; 27. Electromagnetic chuck. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1 - 7 As shown, the present invention is a high-precision coaxiality detection device for an automotive steering column, including a detection platform 1. An adjusting unit 11 is provided on the top of the detection platform 1. A detection unit 12 is slidably connected to the middle of the top of the adjusting unit 11. The detection unit 12 is used to detect coaxiality; A clamping unit 2 is placed in the middle of the top of the detection platform 1. The clamping unit 2 includes a clamping platform 21. A power transmission end 215 is fixedly connected to the outer wall near the bottom of the clamping platform 21. Three sliding grooves 211 are formed on the top surface of the clamping platform 21; A jaw 22 is slidably connected in the sliding groove 211. Grooves are formed on the sides of the jaws 22 close to each other; A clamping plate 23 is fixedly connected in the groove. A plurality of conductive contacts 231 are arranged in an array on the surface of the clamping plate 23 away from the jaw 22.

[0020] In this embodiment, considering that when detecting the high-precision coaxiality of the steering column, the clamping process may cause the clamping to tilt because it is not placed stably. During the detection, the coaxiality detection head may be unevenly stressed on different surfaces, resulting in excessive stress on the detection head and causing it to break. At the same time, the existing clamping usually uses a three-jaw chuck or the like to clamp the steering column. Since the clamping area between the three-jaw chuck and the steering column is small, when clamping a larger steering column, in order to make the clamping more stable, the clamping force of the three-jaw chuck will be increased. When the clamping force is increased, it may damage the surface of the steering column; When clamping the steering column, first place the steering column on the clamping platform 21, and clamp the steering column by moving three jaws 22 inward. When the jaws 22 move inward, they will drive the clamping plate 23 to move inward. When the clamping plate 23 contacts the steering column, it will clamp the steering column. Since the clamping area of the clamping plate 23 is larger, higher stability can be achieved when clamping a larger steering column to prevent the steering column from tilting when clamping the steering column; After 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, and current can enter the steering column through the conductive contact 231. When the steering column tilts, the conductive contacts 231 above or below may not be able to contact the steering column. At this time, the position and angle of the steering column can be understood through the number and position of the conductive contacts 231 that are conducted, 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 tilts.

[0021] Specifically, a rectangular groove is formed 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 uniformly formed on the top surface of the electromagnetic base 24. A detection hole is formed 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 in the detection hole and the electromagnetic hole.

[0022] In this embodiment, considering that the accuracy of measuring the position and angle of the steering column only through the number and position of the conductive contacts 231 being energized is relatively low. Since the conductive contacts 231 cannot be arranged too densely, when the steering column has a small tilt, the conductive contacts 231 may not be able to detect; While the conductive contact 231 detects the steering column, through the setting of the electromagnetic base 24, when the steering column is conductive, a magnetic field will be generated. When the magnetic field is generated, an attractive or repulsive force (depending on the magnetic pole direction) will be generated on the magnet. When the magnet moves through the magnetic field, its moving distance will be recorded, and by calculating the moving distance of each magnet, the offset angle and height of the steering column can be understood. At this time, cross-verification is performed with the data recorded by the conductive contact 231, thereby improving the accuracy and precision of the data.

[0023] Specifically, three lifting grooves are provided on the circumferential surface of the clamping platform 21 close to the clamping jaws 22. Limiting grooves 221 are provided on both outer walls of the clamping jaws 22 located in the sliding grooves 211. A limiting block 253 is slidably connected in the limiting grooves 221. The bottom of the clamping jaws 22 is slidably connected with an adjusting block 252. The adjusting block 252 is fixedly connected with the limiting block 253. One side of the adjusting block 252 close to the clamping platform 21 is fixedly connected with a lifting block 254. The lifting block 254 is slidably connected with the lifting groove.

[0024] In this embodiment, considering that the angle of the steering column needs to be adjusted after the steering column is tilted, but during the adjustment process, the steering column needs to be clamped repeatedly. After clamping multiple times, debris may be generated on the steering column or the clamping jaws 22 due to repeated friction. Since the steering column is detected with high precision, when debris adheres to the surface of the steering column, it may cause errors in the detection results, resulting in poor detection accuracy. When the steering column is tilted, since the steering column is clamped in an inclined state, at this time, the inclination angle of the steering column can be adjusted by adjusting the height of the clamping jaws 22. After adjustment, it is detected again whether the steering column is tilted by the magnet of the electromagnetic base 24 and the conductive contact 231. When the steering column is relatively parallel to the clamping platform 21, the coaxiality detection operation is performed.

[0025] Specifically, three adjusting grooves 213 are provided on the circumferential surface of the clamping platform 21. An adjusting plate 26 is slidably connected in each of the adjusting grooves 213. The adjusting plate 26 is also slidably connected with the circumferential surface of the clamping platform 21. The top surfaces at both ends of the clamping plate 23 are in contact with the bottom of the adjusting block 252. Manual adjusting rods 261 are fixedly connected to the top of the middle part of the clamping plate 23.

[0026] In this embodiment, when the steering column is tilted at a specific angle, two clamping jaws 22 need to be adjusted simultaneously. At this time, the adjusting plate 26 can be adjusted by pulling the manual adjusting rod 261. Since both ends of the adjusting plate 26 are in contact with the adjusting block 252, when the adjusting plate 26 rises or falls, two adjusting blocks 252 will be driven to move simultaneously. At this time, the angle of the steering column between the two adjusting blocks 252 can be adjusted. After adjustment, the position of the adjusting block 252 is adjusted separately again, so that the adjustment accuracy is higher, thereby reducing the inclination amplitude of the steering column. This can reduce the measurement error caused by inclination and also reduce the fracture caused by excessive force on the detection head. It can not only reduce errors but also increase the service life of the detection head.

[0027] Specifically, two support plates 214 are fixedly connected to the outer wall of the clamping platform 21 near the bottom. A first motor 25 is fixedly connected to the top of each of the support plates 214 and the power transmission end 215. The output end of the first motor 25 is fixedly connected to a first screw rod 251, and the first screw rod 251 is sleeved with an adjustment block 252. Three second motors 262 are fixedly connected to the top of the clamping platform 21 within the adjustment slots 213. The output ends of the second motors 262 are fixedly connected to second screw rods 263, and the second screw rods 263 are sleeved with adjustment plates 26.

[0028] In this embodiment, considering that when manually adjusting the tilt error of the steering column, adjustment errors often occur and repeated adjustments are required. This not only consumes time but also requires dedicated personnel for adjustment. At the same time, debris such as dandruff may be scattered during manual adjustment, and when it adheres to the surface of the steering rod, it may cause errors in the detection results. When the steering column is tilted, starting the first motor 25 can drive the first screw rod 251 to rotate. When the first screw rod 251 rotates, it can cause the adjustment block 252 to drive the lifting block 254 to slide within the lifting slot. When the adjustment block 252 rises, it will drive the limit block 253 to move upward and drive the clamping jaw 22 to move upward. When adjusting to a specific angle, starting the second motor 262 can drive the second screw rod 263 to rotate. When the second screw rod 263 rotates, it can cause the adjustment plate 26 to move. Since both ends of the adjustment plate 26 are in contact with the adjustment block 252, at this time, 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.

[0029] Specifically, triangular stoppers 222 are fixedly connected to the bottoms of the two clamping plates 23, and a flat stopper 223 is fixedly connected to the bottom of one of the clamping plates 23. A rectangular clamping is formed between the triangular stopper 222 and the flat stopper 223.

[0030] In this embodiment, considering that some steering columns are equipped with rectangular bases to ensure the stability of placement, when the three clamping jaws 22 clamp the rectangle, the rectangle may shift. At this time, measurement errors may occur during the coaxiality detection of the steering column, and the coaxiality detection head may be damaged due to excessive force. When the steering column is installed with a rectangular base, first remove the electromagnetic base 24, and place the rectangular base in the card slot 212. At this time, through the settings of the triangular stop block 222 and the flat stop block 223, when the three jaws 22 are clamping, they will contact the rectangular base through the triangular stop block 222 and the flat stop block 223. Thus, the rectangular base can be clamped, and by clamping the rectangular base, the offset of the rectangular base can be reduced, thereby increasing the accuracy of detection.

[0031] Specifically, flexible pads 224 are fixedly connected to the surfaces of the jaws 22 close to each other, and the thickness of the flexible pads 224 is thicker than that of the conductive contacts 231.

[0032] In this embodiment, through the setting of the flexible pads 224, deformation and fitting can occur when the jaws 22 clamp the steering column. At this time, the flexible pads 224 can completely wrap the steering column, and thus a larger clamping area and friction force can be obtained to increase the clamping stability. Since the thickness of the flexible pads 224 is thicker than that of the conductive contacts, when clamping, the flexible pads 224 completely wrap the steering column first and then detection is carried out. Thus, the steering column during detection can be more stable, so as to increase the detection accuracy.

[0033] Specifically, a card slot 212 is opened at the bottom of the clamping platform 21, and an electromagnetic chuck 27 is fixedly connected in the card slot 212.

[0034] In this embodiment, considering that in the prior art, the clamping unit 2 is usually fixed using bolts, etc. When clamping different workpieces, disassembly and installation need to be carried out repeatedly. When the number of times of bolt fixation is too many, thread slipping and other situations may occur, resulting in incomplete fixation. At this time, the clamping unit 2 may be unstable and affect the accuracy of detection; Through the setting of the electromagnetic chuck 27, it can be energized during fixation and adsorbed on the detection platform 1. When the position of the clamping unit 2 deviates, the voltage of the electromagnetic chuck 27 can be reduced, thereby reducing the adsorption force of the electromagnetic chuck 27, and the position of the clamping unit 2 can be adjusted by pushing. Due to the existence of partial suction force, it can prevent the driving 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.

[0035] During use, first, when clamping the steering column, place the steering column on the clamping platform 21. Through the setting of the electromagnetic chuck 27, it can be energized during fixation and adsorbed on the detection platform 1. When the position of the clamping unit 2 deviates, the voltage of the electromagnetic chuck 27 can be reduced, thereby reducing the adsorption force of the electromagnetic chuck 27, and the position of the clamping unit 2 can be adjusted by pushing. Due to the existence of partial suction force, it can prevent the driving 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; After the position of the clamping unit 2 is fixed, the steering column is clamped by moving the three jaws 22 inward. When the jaws 22 move inward, they will drive the clamping plate 23 to move inward. When the clamping plate 23 contacts the steering column, it will clamp the steering column. Since the clamping area of the clamping plate 23 is larger, higher stability can be achieved when clamping a larger steering column to prevent the steering column from tilting when it is clamped; After 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, and current can enter the steering column through the conductive contact 231. When the steering column tilts, the upper or lower conductive contact 231 may not be able to contact the steering column. At this time, the position and angle of the steering column can be understood through the number and position of the conductive contacts 231 that are conducted, so as to detect the steering column before detecting the coaxiality, and reduce the occurrence of the detection head breaking during detection when the steering column tilts; While the conductive contact 231 detects the steering column, through the setting of the electromagnetic base 24, when the steering column conducts electricity, a magnetic field will be generated. When the magnetic field is generated, it will generate an attractive or repulsive force on the magnet depending on the magnetic pole direction. When the magnet moves through the magnetic field, its moving distance will be recorded, and the offset angle and height of the steering column can be understood by calculating the moving distance of each magnet. At this time, cross-validation is performed with the data recorded by the conductive contact 231, thereby improving the accuracy and precision of the data.

[0036] Secondly, when the steering column tilts, since the steering column is tilted when it is clamped, at this time, the tilt angle of the steering column can be adjusted by adjusting the height of the jaws 22, and after adjustment, the electromagnetic base 24's magnet and the conductive contact 231 are used to detect again whether the steering column is tilted. When the steering column is relatively parallel to the clamping platform 21, the coaxiality detection operation is performed; When the steering column tilts at a specific angle, two jaws 22 need to be adjusted simultaneously. At this time, the adjusting plate 26 can be adjusted by pulling the manual adjusting rod 261. Since both ends of the adjusting plate 26 contact the adjusting block 252, when the adjusting plate 26 rises or falls, it will drive the two adjusting blocks 252 to move simultaneously. At this time, the angle of the steering column between the two adjusting blocks 252 can be adjusted, and after adjustment, the position of the adjusting block 252 is adjusted separately again, thereby making the adjustment more accurate, reducing the tilt amplitude of the steering column, reducing the measurement error caused by tilting, and also reducing the breakage caused by excessive force on the detection head. This can not only reduce errors but also increase the service life of the detection head; When the steering column tilts, the first motor 25 can be started to drive the first screw rod 251 to rotate. When the first screw rod 251 rotates, the adjusting block 252 can drive the lifting block 254 to slide in the lifting groove. When the adjusting block 252 rises, it will drive the limiting block 253 to move upward and drive the clamping jaw 22 to move upward. When adjusting to a specific angle, the second motor 262 can be started to drive the second screw rod 263 to rotate. When the second screw rod 263 rotates, the adjusting plate 26 can be moved. Since both ends of the adjusting plate 26 are in contact with the adjusting block 252, at this time, the adjusting plate 26 can adjust the angle between the two adjusting blocks 252. Adjusting the movement of the adjusting block 252 by the motor can reduce the error during adjustment and reduce the time consumed by repeatedly adjusting the steering column.

[0037] Finally, when the steering column is installed with a rectangular base, first remove the electromagnetic base 24 and place the rectangular base in the card slot 212. At this time, through the settings of the triangular stopper 222 and the flat stopper 223, when the three clamping jaws 22 perform clamping, they will contact the rectangular base through the triangular stopper 222 and the flat stopper 223, 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. Through the setting of the flexible pad 224, it can be deformed and fitted when the clamping jaw 22 clamps 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 that of the conductive contact point, when clamping, first let the flexible pad 224 completely wrap the steering column and then perform detection. Thus, the steering column during detection can be more stable, increasing the detection accuracy.

[0038] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present invention, so that those skilled in the relevant technical field can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A high-precision coaxiality detection device for an automotive steering column, comprising a detection platform (1). An adjustment unit (11) is provided on the top of the detection platform (1). A detection unit (12) is slidably connected to the middle of the top of the adjustment unit (11). The detection unit (12) is used for detecting coaxiality. It is characterized in that: A clamping unit (2) is placed in the middle of the top of the detection platform (1). The clamping unit (2) includes a clamping platform (21). A power transmission end (215) is fixedly connected to the outer wall near the bottom of the clamping platform (21). Three sliding grooves (211) are formed on the top surface of the clamping platform (21). Claw jaws (22) are slidably connected in the sliding grooves (211). Grooves are formed on the sides of the claw jaws (22) close to each other. Clamping plates (23) are fixedly connected in the grooves. A plurality of conductive contacts (231) are arranged in an array on the surface of the clamping plate (23) away from the claw jaw (22).

2. The high-precision coaxiality detection device for an automotive steering column according to claim 1, wherein: A rectangular groove is formed 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 formed on the top surface of the electromagnetic base (24). A detection hole is formed 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 holes. Magnets are slidably connected in the detection hole and the electromagnetic holes.

3. The high-precision coaxiality detection device for an automotive steering column according to claim 1, wherein: Three lifting grooves are formed on the circumferential surface of the clamping platform (21) close to the claw jaws (22). Limiting grooves (221) are formed on the outer walls of both sides of the claw jaws (22) located in the sliding grooves (211). Limiting blocks (253) are slidably connected in the limiting grooves (221). An adjustment block (252) is slidably connected to the bottom of the claw jaw (22). The adjustment block (252) is fixedly connected to the limiting block (253). A lifting block (254) is fixedly connected to the side of the adjustment block (252) close to the clamping platform (21). The lifting block (254) is slidably connected to the lifting groove.

4. A high-precision coaxiality detection device for an automotive steering column according to claim 3, characterized in that: Three adjustment grooves (213) are formed on the circumferential surface of the clamping platform (21). Adjustment plates (26) are slidably connected in the adjustment grooves (213). The adjustment plates (26) and the circumferential surface of the clamping platform (21) are both slidably connected. The top surfaces of both ends of the clamping plate (23) are in contact with the bottom of the adjustment block (252). Manual adjustment rods (261) are fixedly connected to the tops of the middle parts of the clamping plates (23).

5. The high-precision coaxiality detection device for an automotive steering column according to claim 4, characterized in that: Two support plates (214) are fixedly connected to the outer wall near the bottom of the clamping platform (21). First motors (25) are fixedly connected to the tops of the support plates (214) and the power transmission end (215). A first screw rod (251) is fixedly connected to the output end of the first motor (25). The first screw rod (251) is sleeved on the adjustment block (252). Three second motors (262) are fixedly connected to the top of the clamping platform (21) located in the adjustment grooves (213). Second screw rods (263) are fixedly connected to the output ends of the second motors (262). The second screw rods (263) are sleeved on the adjustment plates (26).

6. The high-precision coaxiality detection device for an automotive steering column according to claim 1, characterized in that: A triangular stop block (222) is fixedly connected to the bottom of each of the two clamping plates (23), and a flat stop block (223) is fixedly connected to the bottom of one of the clamping plates (23). A rectangular clamping is formed between the triangular stop block (222) and the flat stop block (223).

7. The high-precision coaxiality detection device for an automotive steering column according to claim 1, wherein: Flexible pads (224) are fixedly connected to the surfaces of the jaws (22) close to each other, and the thickness of the flexible pads (224) is thicker than that of the conductive contacts (231).

8. A high-precision coaxiality detection device for an automotive steering column according to claim 1, characterized in that: A clamping groove (212) is formed in the bottom of the clamping platform (21), and an electromagnetic chuck (27) is fixedly connected in the clamping groove (212).

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