Measuring instrument for measuring roundness of inner and outer rings of automobile hub bearing

Abstract

The invention discloses a measuring instrument for measuring the roundness of an inner ring and an outer ring of an automobile hub bearing, and particularly relates to the field of bearing roundness measurement, the measuring instrument comprises a working table, a rotating disc is arranged on the upper surface of the middle of the working table, an adsorption cavity is embedded in the surface of the middle of the working table, and air holes are formed in the surface of the rotating disc; a driving gear is fixedly connected to the outer wall of the middle of the driving shaft, a blade fan shaft is arranged on one side of the inner wall of the adsorption cavity through a bearing, a blade fan gear is fixedly connected to the outer wall of the middle of the blade fan shaft, a spiral blade fan is fixedly connected to the outer wall of the top of the blade fan shaft, and a measurement supporting assembly is arranged on one side of the rotating disc. An auxiliary adjusting assembly is arranged on the side, away from the measurement supporting assembly, of the rotating disc. According to the device, the spiral blade fan can be automatically driven to rotate through the rotation of the rotating disc, so that the workpiece is adsorbed, no mechanical clamping trace exists, the hub bearing workpiece is fixed through the assistance of adsorption force, and the detection stability is improved.

Description

Technical Field

[0001] The present application relates to the field of bearing roundness measurement. More specifically, the present application relates to a measuring instrument for measuring the roundness of the inner and outer rings of automotive hub bearings. Background Art

[0002] The roundness accuracy of the inner and outer rings of automotive hub bearings is a core index affecting vehicle driving smoothness, noise control, and bearing life. A roundness instrument is a measuring tool that uses the rotary axis method to measure the roundness error of a workpiece. The roundness instrument is divided into two types: sensor rotary type and workbench rotary type. During measurement, the workpiece to be measured is concentrically installed with the precision shaft system, and the precision shaft system drives an inductive length sensor or the workbench to perform an accurate circular motion. After retrieval, the existing patent (Publication No.: CN112113532A) discloses a roundness instrument for detecting bearings, including a roundness instrument base plate. A placement table, a left column, and a right column are sequentially and fixedly installed on the top of the roundness instrument base plate from left to right. Card slots are opened on the outer walls of the left column and the right column, and a cross beam is arranged inside the left column and the right column. The roundness instrument for detecting bearings, through the setting of the driving gear disk and the transmission gear disk inside the gearbox, can drive the cross beam to move up and down by rotating the driving gear disk through the transmission gear disk and the threaded column, thereby facilitating the adjustment of the height of the measuring head, solving the problem that the existing device needs to be equipped with hydraulic components, resulting in high cost. With the setting of the radii of the driving gear disk and the transmission gear disk, the transmission ratio between the gears can be changed, thereby facilitating the fine adjustment of the measuring head, solving the problems that it is difficult to finely adjust the measuring head and the operation is cumbersome in the existing device. The inventor found the following problems in the prior art during the implementation of this application: During the existing measurement of the roundness of the inner and outer rings of bearings, it is often only clamped by a separate mechanical fixture without an auxiliary stable structure; during the measurement of the roundness of the inner and outer rings, it is often necessary to use a single probe for point-by-point scanning, and the inner and outer rings need to be adjusted separately for step-by-step measurement, which easily reduces the matching of the measurement data of the inner and outer rings. Therefore, a measuring instrument for measuring the roundness of the inner and outer rings of automotive hub bearings is proposed to solve the above problems. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present application provides a measuring instrument for measuring the roundness of the inner and outer rings of automotive hub bearings to solve the problems raised in the above background art.

[0004] To achieve the above object, the present application provides the following technical solution: A measuring instrument for measuring the roundness of the inner and outer rings of an automotive wheel hub bearing, comprising a workbench, wherein a rotating disk is provided on the upper surface of the middle part of the workbench, an adsorption cavity is embedded on the middle surface of the workbench, the adsorption cavity is arranged at the bottom of the rotating disk, the inner wall of the middle part of the adsorption cavity is connected to a driving shaft through a bearing, the top end of the driving shaft is fixedly connected to the rotating disk, air holes are arranged on the surface of the rotating disk in an array, a driving gear is fixedly connected to the outer wall of the middle part of the driving shaft, a fan shaft is arranged on one side of the inner wall of the adsorption cavity through a bearing, multiple groups of the fan shafts are provided, a fan gear is fixedly connected to the outer wall of the middle part of the fan shaft, the fan gear is meshed with the driving gear, a spiral fan is fixedly connected to the top outer wall of the fan shaft, a measuring support assembly is arranged on one side of the rotating disk, and an auxiliary adjustment assembly is arranged on the side of the rotating disk away from the measuring support assembly.

[0005] Preferably, a magnetic block is arranged on one side of the air hole, a support ring is arranged at the edge of the adsorption cavity, auxiliary balls are arranged in an array on the top outer wall of the support ring, the auxiliary balls are in contact with the rotating disk, a first servo motor is embedded on one side of the bottom of the workbench, and the output end of the first servo motor is connected to the driving shaft.

[0006] Preferably, the measuring support assembly includes a support frame, a screw rod, a moving block, an adjustment motor, an adjustment frame, an electric push rod and a connecting block. The inner wall of the middle part of the support frame is connected to the screw rod through a bearing, the outer wall of the middle part of the screw rod is threadedly connected to the moving block, the moving block is embedded in the inner wall of the support frame, an adjustment motor is fixedly connected to the top of the support frame, the output end of the adjustment motor is connected to the screw rod, an adjustment frame is fixedly connected to the outer wall of the moving block, a connecting block is slidably connected to the inner wall of the adjustment frame, an electric push rod is fixedly connected to one side inner wall of the adjustment frame, and the output end of the electric push rod is connected to the connecting block.

[0007] Preferably, the auxiliary adjustment assembly includes a support table, an electric telescopic rod and a limiting push plate. An electric telescopic rod is arranged on one side of the top of the support table, the output end of the electric telescopic rod is fixedly connected to the limiting push plate, a measuring frame is fixedly connected to the outer wall of the connecting block, a rotating column is connected to the inner wall of the top of the measuring frame through a bearing, a second servo motor is fixedly connected to the top outer wall of the measuring frame, and the output end of the second servo motor is connected to the rotating column.

[0008] Preferably, a connecting strip is fixedly connected to the bottom end of the rotating column, a first detection rod penetrates through one side of the connecting strip, and the first detection rod is connected to the connecting strip through a bearing. The bottom end of the first detection rod is connected to a first probe.

[0009] Preferably, a limiting groove is provided on the side of the connecting bar away from the first detection rod. The inner wall of the limiting groove is connected to a lead screw through a bearing. A limiting block is threadedly connected to the outer wall of the lead screw. A third servo motor is provided on the outer wall of one side of the connecting bar. The output end of the third servo motor is connected to the lead screw. The bottom end of the limiting block is connected to a second detection rod through a bearing. A second probe is provided at the bottom end of the second detection rod. The angles of the first probe and the second probe are set opposite to each other.

[0010] Preferably, a linkage gear is fixedly connected to the outer wall of one side of the top of the first detection rod. A toothed ring is fixedly connected to the outer ring of the rotating column where the measuring frame is located. The linkage gear meshes with the toothed ring. A first bevel gear is fixedly connected to the outer wall of one side of the bottom of the first detection rod where it is located on the connecting bar. A limiting sleeve is fixedly connected to the bottom outer wall of the connecting bar. A rotating cylinder is connected through the middle inner wall of the limiting sleeve by a bearing. A second bevel gear is fixedly connected to the outer wall of one side of the rotating cylinder. The second bevel gear meshes with the first bevel gear.

[0011] Preferably, a rotating rod is embedded in the inner wall of the side of the rotating cylinder away from the second bevel gear. The rotating cylinder and the rotating rod are slidably connected. An auxiliary sleeve is sleeved on the outer wall of one side of the rotating rod. The rotating rod and the auxiliary sleeve are connected through a bearing. The top end of the auxiliary sleeve is fixed to the limiting block. A third bevel gear is fixedly connected to the end of the rotating rod away from the rotating cylinder. A fourth bevel gear is fixedly connected to the outer wall of one side of the second detection rod. The fourth bevel gear meshes with the third bevel gear.

[0012] Preferably, a strip-shaped groove is provided on the outer wall of one side of the top of the rotating rod. A slider is fixedly connected to one side of the inner wall of the top of the rotating cylinder. The slider is embedded in the strip-shaped groove and is slidably connected to the strip-shaped groove.

[0013] Preferably, an exhaust cavity is provided on the inner wall of the bottom of the workbench. The exhaust cavity is communicated with the adsorption cavity. One side of the exhaust cavity is communicated with an exhaust pipe. The end of the exhaust pipe extends to the outside of the workbench. One side of the middle of the exhaust pipe is communicated with a communicating pipe through a three-way valve. A blowing cavity is provided in the middle of the limiting push plate. Through holes are provided on the surface of the limiting push plate. The through holes are communicated with the blowing cavity. The top of the communicating pipe extends above the workbench and is communicated with the blowing cavity. A pressure sensor is provided on the surface of the limiting push plate. A receiving and control host is provided on one side of the measuring and supporting assembly. A display is electrically connected to one side of the receiving and control host.

[0014] The technical effects and advantages of this application: 1. Compared with the prior art, the measuring instrument for measuring the roundness of the inner and outer rings of an automotive wheel hub bearing meshes the driving gear with multiple sets of fan gears to split the power to each fan shaft. The spiral fans at the top of the fan shafts rotate at high speed, forming a centrifugal air flow in the adsorption chamber, generating negative pressure through the air holes to adsorb the workpiece. The fan shafts are evenly distributed in a circle to ensure uniform distribution of the adsorption force. The spiral fans adopt backward-inclined blades to reduce the air flow noise and improve the negative pressure stability. Multiple sets of spiral fans generate negative pressure synchronously to eliminate the workpiece skew caused by single-point adsorption. The rotation of the rotating disk can automatically drive the spiral fans to rotate, thereby realizing the adsorption of the workpiece without mechanical clamping marks. The detection stability is improved by using the adsorption force to assist in fixing the wheel hub bearing workpiece.

[0015] 2. Compared with the prior art, the measuring instrument for measuring the roundness of the inner and outer rings of an automotive wheel hub bearing can realize the synchronous measurement of the inner and outer rings of the wheel hub bearing through the relative setting and cooperation of the second probe and the first probe. During the rotation of the rotating column, the connecting bar can be driven to make a circular motion. The linkage gear meshes with the toothed ring, so that the gear rotates while the connecting cylinder rotates, ensuring that the rotation angles of the first detection rod and the first probe are strictly synchronized with the rotating column. While the rotating column rotates at a right angle, the first detection rod rotates at a right angle in the opposite direction, facilitating the switching between synchronous measurement of the inner and outer rings and single-side measurement on one side, realizing the adjustment of two measurement methods for the first detection rod and the second detection rod, synchronous calibration of the double probes, reduction of the single-piece measurement time consumption, and improvement of the efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view structural schematic diagram of the whole application; Figure 2 It is a three-dimensional structural schematic diagram of the whole application; Figure 3 It is a connection structural schematic diagram of the connecting bar and the rotating column of the whole application; Figure 4 It is a connection structural schematic diagram of the first detection rod and the second detection rod of the whole application; Figure 5 It is a connection structural schematic diagram of the rotating disk and the workbench of the whole application; Figure 6 It is a structural schematic diagram after the rotation of the connecting bar of the whole application; Figure 7 It is a structural schematic diagram of the measuring support assembly of the whole application; Figure 8 It is a structural schematic diagram of the internal part of the limiting push plate of the whole application.

[0017] The reference numerals are: 1, workbench; 2, rotating disc; 3, adsorption cavity; 4, drive shaft; 5, air hole; 6, magnetic attraction block; 7, drive gear; 8, fan shaft; 9, fan gear; 10, spiral fan; 11, support ring; 12, auxiliary ball; 13, measurement support assembly; 131, support frame; 132, screw rod; 133, moving block; 134, adjustment motor; 135, adjustment frame; 136, electric push rod; 137, connecting block; 14, auxiliary adjustment assembly; 141, support table; 142, electric telescopic rod; 143, limit push plate; 15, first servo motor; 16, measurement frame; 17, rotating column; 171, second servo motor; 18, connecting bar; 19, first detection rod; 20, first probe; 21, limit groove; 22, lead screw; 23, limit block; 24, third servo motor; 25, second detection rod; 26, second probe; 27, linkage gear; 28, toothed ring; 29, first bevel gear; 30, limit sleeve; 31, rotating cylinder; 32, second bevel gear; 33, rotating rod; 34, auxiliary sleeve; 35, third bevel gear; 36, fourth bevel gear; 37, strip groove; 38, slider; 39, exhaust cavity; 40, exhaust pipe; 41, three-way valve; 42, connecting pipe; 43, blowing cavity; 44, through hole; 45, pressure sensor; 46, receiving and control host; 47, display. Detailed implementation manners

[0018] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application. Embodiment 1

[0019] As shown in the attached Figures 1 to 8 A measuring instrument for measuring the roundness of the inner and outer rings of an automotive wheel hub bearing, including a workbench 1. A rotating disc 2 is arranged on the upper surface of the middle part of the workbench 1. An adsorption cavity 3 is embedded in the middle surface of the workbench 1. The adsorption cavity 3 is arranged at the bottom of the rotating disc 2. The inner wall of the middle part of the adsorption cavity 3 is connected to a drive shaft 4 through a bearing. The top end of the drive shaft 4 is fixedly connected to the rotating disc 2. Air holes 5 are arranged on the surface of the rotating disc 2 in an array. A drive gear 7 is fixedly connected to the outer wall of the middle part of the drive shaft 4. One side of the inner wall of the adsorption cavity 3 is provided with a fan shaft 8 through a bearing. There are multiple groups of fan shafts 8. A fan gear 9 is fixedly connected to the outer wall of the middle part of the fan shaft 8. The fan gear 9 meshes with the drive gear 7. A spiral fan 10 is fixedly connected to the outer wall of the top of the fan shaft 8. A measurement support assembly 13 is arranged on one side of the rotating disc 2. An auxiliary adjustment assembly 14 is arranged on the side of the rotating disc 2 away from the measurement support assembly 13.

[0020] Among them, the workbench 1 plays a supporting role. The rotating disk 2 can carry the automotive wheel hub bearing. The rotating disk 2 can rotate on the surface of the workbench 1. The first servo motor 15 drives the drive shaft 4 to rotate through a coupling. The rotation of the drive shaft 4 drives the top rotating disk 2 to rotate synchronously. While the drive shaft 4 rotates, it drives the drive gear 7 to rotate synchronously. The drive gear 7 meshes with multiple groups of fan gears 9 to split the power to each fan shaft 8. The spiral fans 10 at the top of the fan shafts 8 rotate at high speed to form a centrifugal air flow in the adsorption chamber 3, generating a negative pressure through the air holes 5 to adsorb the workpiece. The fan shafts 8 are evenly distributed in a circle to ensure uniform distribution of the adsorption force. The spiral fans 10 adopt backward-inclined blades to reduce the air flow noise and improve the negative pressure stability. The negative pressure is generated synchronously by multiple groups of spiral fans 10 to eliminate the workpiece skew caused by single-point adsorption. The rotation of the rotating disk 2 can automatically drive the spiral fans 10 to rotate to achieve the adsorption of the workpiece, without mechanical clamping marks. The workpiece of the wheel hub bearing is fixed by the adsorption force to improve the detection stability. Embodiment 2

[0021] On the basis of Embodiment 1, the solution in Embodiment 1 is further refined and introduced in combination with the following specific working methods, as Figures 1 to 8 shown, and the details are described below: As a preferred implementation method, a magnetic attraction block 6 is arranged on one side of the air hole 5, and a support ring 11 is arranged at the edge of the adsorption chamber 3. The auxiliary balls 12 are arranged in an array on the top outer wall of the support ring 11. The auxiliary balls 12 are in contact with the rotating disk 2. A first servo motor 15 is embedded on one side of the bottom of the workbench 1. The output end of the first servo motor 15 is connected to the drive shaft 4. Among them, the magnetic attraction block 6 and the air hole 5 are arranged at intervals to double-fix the steel workpiece and improve the anti-vibration ability. Non-steel bearings can still be fixed by pure negative pressure, with a wider compatibility. The support ring 11 plays a role in supporting the auxiliary balls 12. The auxiliary balls 12 are made of silicon nitride ceramics to reduce the rotation resistance of the rotating disk. The first servo motor 15 plays a driving role.

[0022] As a preferred embodiment, the measurement support assembly 13 includes a support frame 131, a screw rod 132, a moving block 133, an adjustment motor 134, an adjustment frame 135, an electric push rod 136, and a connecting block 137. The inner wall of the middle part of the support frame 131 is connected with the screw rod 132 through a bearing. The outer wall of the middle part of the screw rod 132 is threadedly connected with the moving block 133. The moving block 133 is embedded in the inner wall of the support frame 131. The top of the support frame 131 is fixedly connected with an adjustment motor 134. The output end of the adjustment motor 134 is connected with the screw rod 132. The outer wall of the moving block 133 is fixedly connected with an adjustment frame 135. The inner wall of the adjustment frame 135 is slidably connected with a connecting block 137. One side inner wall of the adjustment frame 135 is fixedly connected with an electric push rod 136. The output end of the electric push rod 136 is connected with the connecting block 137. Among them, when the height is adjusted, the adjustment motor 134 is started to drive the screw rod 132 to rotate. The threaded fit between the screw rod 132 and the moving block 133 converts the rotational motion into vertical lifting. The lifting of the moving block 133 drives the adjustment frame 135 to quickly match the height requirements of workpieces with different diameters. When the horizontal adjustment is carried out, the electric push rod 136 is started to push the connecting block 137 to slide along the inner wall of the adjustment frame 135, thereby driving the measurement frame 16 and the subsequent measurement assembly to adjust the horizontal position, so as to facilitate the roundness measurement of hub bearings with different specifications.

[0023] As a preferred embodiment, the auxiliary adjustment assembly 14 includes a support table 141, an electric telescopic rod 142, and a limit push plate 143. An electric telescopic rod 142 is arranged on one side of the top of the support table 141. The output end of the electric telescopic rod 142 is fixedly connected with a limit push plate 143. The outer wall of the connecting block 137 is fixedly connected with a measurement frame 16. The inner wall of the top of the measurement frame 16 is connected with a rotating column 17 through a bearing. The outer wall of the top of the measurement frame 16 is fixedly connected with a second servo motor 171. The output end of the second servo motor 171 is connected with the rotating column 17. Among them, the auxiliary adjustment assembly 14 can correct the hub bearing. The electric telescopic rod 142 is used to push the limit push plate 143 to move horizontally. The silica gel buffer layer on the surface of the limit push plate 143 contacts the side wall of the workpiece. The pressure sensor 45 monitors the contact force in real time. When the workpiece deviates on the rotating disk 2 due to placement deviation, the limit push plate 143 applies a lateral thrust to make the center of the workpiece coincide with the axis of the rotating disk 2, so as to facilitate high-precision measurement. The second servo motor 171 can drive the rotating column 17 to rotate.

[0024] As a preferred embodiment, a connecting bar 18 is fixedly connected to the bottom end of the rotating column 17. A first detection rod 19 penetrates and connects through one side of the connecting bar 18, and the first detection rod 19 is connected to the connecting bar 18 through a bearing. A first probe 20 is connected to the bottom end of the first detection rod 19. Among them, the connecting bar 18 plays a connecting role. The rotation of the rotating column 17 drives the connecting bar 18 to perform a circular motion, so that the angle of the connecting bar 18 can be converted, facilitating the conversion of the measurement mode. The cooperation between the first detection rod 19 and the first probe 20 can detect the roundness of the bearing.

[0025] As a preferred embodiment, a limiting groove 21 is provided on the side of the connecting bar 18 away from the first detection rod 19. A lead screw 22 is connected to the inner wall of the limiting groove 21 through a bearing. A limiting block 23 is threadedly connected to the outer wall of the lead screw 22. A third servo motor 24 is provided on the outer wall of one side of the connecting bar 18, and the output end of the third servo motor 24 is connected to the lead screw 22. The bottom end of the limiting block 23 is connected to a second detection rod 25 through a bearing. A second probe 26 is provided at the bottom end of the second detection rod 25. The angles of the first probe 20 and the second probe 26 are relatively arranged. Among them, the third servo motor 24 can drive the lead screw 22 to rotate. The rotation of the lead screw 22 drives the limiting block 23 to perform a translational motion, thereby driving the second detection rod 25 and the second probe 26 to perform a translational motion, so as to realize the adjustment of different positions of the distance between the second probe 26 and the first probe 20, facilitating the adjustment and detection of hub bearings with different thicknesses. Through the relative arrangement and cooperation of the second probe 26 and the first probe 20, the synchronous measurement of the inner and outer rings of the hub bearing can be realized, improving the detection efficiency.

[0026] As a preferred embodiment, a linkage gear 27 is fixedly connected to the outer wall of one side of the top of the first detection rod 19. A toothed ring 28 is fixedly connected to the outer circle of the rotating column 17 where the measuring frame 16 is located. The linkage gear 27 meshes with the toothed ring 28. A first bevel gear 29 is fixedly connected to the outer wall of one side of the bottom of the first detection rod 19 located on the connecting bar 18. A limiting sleeve 30 is fixedly connected to the bottom outer wall of the connecting bar 18. A rotating cylinder 31 penetrates through the middle inner wall of the limiting sleeve 30 through a bearing. A second bevel gear 32 is fixedly connected to the outer wall of one side of the rotating cylinder 31. The second bevel gear 32 meshes with the first bevel gear 29. Among them, during the rotation of the rotating column 17, the connecting bar 18 can be driven to perform a circular motion. The linkage gear 27 meshes with the toothed ring 28, so that the gear 27 rotates while the connecting bar 18 rotates. The gear ratios of the linkage gear 27 and the toothed ring 28 are the same, ensuring that the rotation angles of the first detection rod 19 and the first probe 20 are strictly synchronized with the rotating column 17. While the rotating column 17 rotates at a right angle, the first detection rod 19 rotates at a right angle in the opposite direction, facilitating the switching between the synchronous measurement of the inner and outer rings and the single-side measurement on one side.

[0027] As a preferred embodiment, a rotating rod 33 is embedded in the inner wall of the rotating cylinder 31 on the side away from the second bevel gear 32. The rotating cylinder 31 is slidably connected to the rotating rod 33. An auxiliary sleeve 34 is sleeved on the outer wall of one side of the rotating rod 33, and the rotating rod 33 is connected to the auxiliary sleeve 34 through a bearing. The top end of the auxiliary sleeve 34 is fixedly connected to the limiting block 23. One end of the rotating rod 33 away from the rotating cylinder 31 is fixedly connected to a third bevel gear 35. A fourth bevel gear 36 is fixedly connected to the outer wall of one side of the second detection rod 25. The fourth bevel gear 36 meshes with the third bevel gear 35. Among them, the first bevel gear 29 at the bottom of the connecting strip 18 meshes with the second bevel gear 32 on the rotating cylinder 31, transmitting the rotational power of the first detection rod 19 to the rotating cylinder 31. The rotating cylinder 31 rotates in the limiting sleeve 30 through a bearing, realizing low-loss power transmission. When the rotating cylinder 31 rotates to drive the rotating rod 33 to rotate synchronously, and at the same time when the lead screw 22 drives the limiting block 23 to move, the auxiliary sleeve 34 drives the rotating rod 33 to slide axially along the rotating cylinder 31, ensuring that the third bevel gear 35 and the fourth bevel gear 36 are always meshed. The sliding connection between the rotating rod 33 and the rotating cylinder 31 allows the second probe 26 to maintain power transmission continuity during radial sliding adjustment. The rotating rod 33 meshes with the fourth bevel gear 36 through the third bevel gear 35, diverting the power to the second detection rod 25, thereby realizing the rotation of the first detection rod 19 and the second detection rod 25 in opposite directions, achieving the adjustment of two measurement methods for the first detection rod 19 and the second detection rod 25, synchronous calibration of the double probes, reduction of the single-piece measurement time-consuming, and improvement of the efficiency.

[0028] As a preferred embodiment, a strip-shaped groove 37 is provided on the outer wall of one side of the top of the rotating rod 33. One side of the inner wall of the top of the rotating cylinder 31 is fixedly connected with a slider 38. The slider 38 is embedded in the strip-shaped groove 37, and the slider 38 is slidably connected to the strip-shaped groove 37. Among them, the sliding connection between the slider 38 and the strip-shaped groove 37 enables the rotating rod 33 and the rotating cylinder 31 to adjust their relative positions and perform concentric rotation at the same time.

[0029] As a preferred embodiment, an exhaust cavity 39 is provided on the inner wall of the bottom of the workbench 1. The exhaust cavity 39 is communicated with the adsorption cavity 3. One side of the exhaust cavity 39 is communicated with an exhaust pipe 40. The end of the exhaust pipe 40 extends to the outside of the workbench 1. One side of the middle part of the exhaust pipe 40 is communicated with a connecting pipe 42 through a three-way valve 41. A blowing cavity 43 is provided in the middle of the limiting push plate 143. Through holes 44 are provided on the surface of the limiting push plate 143. The through holes 44 are communicated with the blowing cavity 43. The top of the connecting pipe 42 extends above the workbench 1 and is communicated with the blowing cavity 43. A pressure sensor 45 is provided on the surface of the limiting push plate 143. A receiving and control host 46 is provided on one side of the measuring and supporting assembly 13. One side of the receiving and control host 46 is electrically connected to a display 47. Among them, by transmitting the detected data to the receiving and control host 46, and after data processing, the image is transmitted into the display 47 to facilitate the observation and recording of roundness. The air adsorbed in the adsorption cavity 3 can be discharged to the outside through the exhaust cavity 39 and the exhaust pipe 40. Before measurement, an instruction can be sent through the receiving and control host 46, and the three-way valve 41 is switched to the path of the connecting pipe 42. The air flow path passes through the exhaust pipe 40 and the three-way valve 41 and then is transported into the connecting pipe 42. Subsequently, it is transported into the blowing cavity 43 through the connecting pipe 42 and then discharged through the through holes 44. The compressed air blows towards the surface of the workpiece through the through holes 44 to assist in removing debris and floating dust on its surface to improve the measurement accuracy of the workpiece. When measuring, the three-way valve 41 closes the path of the connecting pipe 42 and opens the path of the exhaust pipe 40 to discharge the gas, avoiding the air flow pushing the workpiece during the measurement process and causing it to shift. During the rotation of the workpiece, the radial runout caused by the roundness error is transmitted to the pressure sensor 45 through the limiting push plate 143. The receiving and control host 46 drives the electric telescopic rod 142 to finely adjust the position of the push plate according to the pressure fluctuation signal.

[0030] The working process of this application is as follows: First, place the automotive wheel hub bearing to be measured on the surface of the rotating disk 2. The first servo motor 15 drives the drive shaft 4 to rotate through a coupling. The rotation of the drive shaft 4 drives the top rotating disk 2 to rotate synchronously. While the drive shaft 4 rotates, it drives the drive gear 7 to rotate synchronously. The drive gear 7 meshes with multiple fan gears 9 to split the power to each fan shaft 8. The spiral fans 10 at the top of the fan shafts 8 rotate at high speed to form a centrifugal air flow in the adsorption chamber 3, generating negative pressure through the air holes 5 to adsorb the workpiece. By receiving the instruction sent by the receiving control host 46, the three-way valve 41 switches to the communicating pipe 42 path. The air flow path is transported to the communicating pipe 42 after passing through the exhaust pipe 40 and the three-way valve 41, and then is transported to the blowing chamber 43 through the communicating pipe 42 and discharged through the through hole 44. The compressed air blows towards the surface of the workpiece through the through hole 44 to assist in removing debris and floating ash on its surface to improve the measurement accuracy of the workpiece. When measuring, the three-way valve 41 closes the path of the communicating pipe 42 and opens the path of the exhaust pipe 40 to discharge the gas. When adjusting the height, the adjusting motor 134 starts, driving the screw rod 132 to rotate. The screw thread fit between the screw rod 132 and the moving block 133 converts the rotational motion into vertical lifting. The lifting of the moving block 133 drives the adjusting frame 135 to quickly match the height requirements of workpieces with different diameters. When making a lateral adjustment, the electric push rod 136 starts to push the connecting block 137 to slide along the inner wall of the adjusting frame 135, thereby driving the measuring frame 16 and subsequent measuring components to adjust the lateral position, facilitating the roundness measurement of wheel hub bearings of different specifications. By transmitting the detected data to the receiving control host 46, the image is transmitted to the display 47 after data processing to facilitate the observation and recording of the roundness; The third servo motor 24 can drive the lead screw 22 to rotate. The rotation of the lead screw 22 drives the limit block 23 to perform a translational motion, thereby driving the second detection rod 25 and the second probe 26 to perform a translational motion, thus realizing the adjustment of the distance between the second probe 26 and the first probe 20 at different positions, facilitating the adjustment and detection of wheel hub bearings with different thicknesses. The relative setting and cooperation of the second probe 26 and the first probe 20 can realize the synchronous measurement of the inner and outer rings of the wheel hub bearing. During the rotation of the rotating column 17, it can drive the connecting bar 18 to perform a circular motion. The linkage gear 27 meshes with the gear ring 28, so that the gear 27 rotates while the connecting bar 18 rotates. The gear ratio of the linkage gear 27 and the gear ring 28 is the same, ensuring that the rotation angles of the first detection rod 19 and the first probe 20 are strictly synchronized with the rotating column 17. While the rotating column 17 rotates at a right angle, the first detection rod 19 rotates at a right angle in the opposite direction, facilitating the switching between synchronous measurement of the inner and outer rings and single-side single measurement, realizing the adjustment of two measurement methods for the first detection rod 19 and the second detection rod 25, synchronous calibration of double probes, reduction of the single-piece measurement time-consuming, and improvement of efficiency.

Claims

1. A measuring instrument for measuring the roundness of the inner and outer rings of an automotive wheel hub bearing, comprising a workbench (1), characterized in that: A rotating disk (2) is provided on the upper surface of the middle part of the workbench (1). An adsorption cavity (3) is embedded in the middle surface of the workbench (1). The adsorption cavity (3) is arranged at the bottom of the rotating disk (2). A driving shaft (4) is connected to the inner wall of the middle part of the adsorption cavity (3) through a bearing. The top end of the driving shaft (4) is fixedly connected to the rotating disk (2). Air holes (5) are arranged on the surface of the rotating disk (2). A driving gear (7) is fixedly connected to the outer wall of the middle part of the driving shaft (4). A fan shaft (8) is arranged on one side inner wall of the adsorption cavity (3) through a bearing. Multiple groups of the fan shafts (8) are provided. A fan gear (9) is fixedly connected to the outer wall of the middle part of the fan shaft (8). The fan gear (9) is meshed with the driving gear (7). A spiral fan (10) is fixedly connected to the outer wall of the top of the fan shaft (8). A measurement support assembly (13) is arranged on one side of the rotating disk (2). An auxiliary adjustment assembly (14) is arranged on the side of the rotating disk (2) away from the measurement support assembly (13).

2. The measuring instrument for measuring the roundness of the inner and outer rings of an automotive wheel hub bearing according to claim 1, wherein: A magnetic block (6) is arranged on one side of the air hole (5). A support ring (11) is arranged at the edge of the adsorption cavity (3). Auxiliary balls (12) are arranged in the top outer wall of the support ring (11) in an array. The auxiliary balls (12) are in contact with the rotating disk (2). A first servo motor (15) is embedded in one side of the bottom of the workbench (1). The output end of the first servo motor (15) is connected to the driving shaft (4).

3. The measuring instrument for measuring the roundness of the inner and outer rings of an automotive wheel hub bearing according to claim 1, wherein: The measurement support assembly (13) includes a support frame (131), a screw rod (132), a moving block (133), an adjustment motor (134), an adjustment frame (135), an electric push rod (136) and a connecting block (137). A screw rod (132) is connected to the inner wall of the middle part of the support frame (131) through a bearing. A moving block (133) is threadedly connected to the outer wall of the middle part of the screw rod (132). The moving block (133) is embedded in the inner wall of the support frame (131). An adjustment motor (134) is fixedly connected to the top of the support frame (131). The output end of the adjustment motor (134) is connected to the screw rod (132). An adjustment frame (135) is fixedly connected to the outer wall of the moving block (133). A connecting block (137) is slidably connected to the inner wall of the adjustment frame (135). An electric push rod (136) is fixedly connected to one side inner wall of the adjustment frame (135). The output end of the electric push rod (136) is connected to the connecting block (137).

4. A measuring instrument for measuring the roundness of the inner and outer rings of an automotive wheel bearing according to claim 3, characterized in that: The auxiliary adjustment assembly (14) includes a support platform (141), an electric telescopic rod (142) and a limiting push plate (143). An electric telescopic rod (142) is arranged on one side of the top of the support platform (141), and the output end of the electric telescopic rod (142) is fixedly connected with the limiting push plate (143). The outer wall of the connecting block (137) is fixedly connected with a measuring frame (16). The inner wall of the top of the measuring frame (16) is connected with a rotating column (17) through a bearing. The outer wall of the top of the measuring frame (16) is fixedly connected with a second servo motor (171), and the output end of the second servo motor (171) is connected with the rotating column (17).

5. A measuring instrument for measuring the roundness of the inner and outer rings of an automotive wheel bearing according to claim 4, characterized in that: The bottom end of the rotating column (17) is fixedly connected with a connecting strip (18). One side of the connecting strip (18) is penetrated and connected with a first detection rod (19), and the first detection rod (19) is connected with the connecting strip (18) through a bearing. The bottom end of the first detection rod (19) is connected with a first probe (20).

6. A measuring instrument for measuring the roundness of the inner and outer rings of an automotive wheel bearing according to claim 5, characterized in that: A limiting groove (21) is arranged on the side of the connecting strip (18) away from the first detection rod (19). The inner wall of the limiting groove (21) is connected with a lead screw (22) through a bearing. A limiting block (23) is threadedly connected to the outer wall of the lead screw (22). A third servo motor (24) is arranged on the outer wall of one side of the connecting strip (18), and the output end of the third servo motor (24) is connected with the lead screw (22). The bottom end of the limiting block (23) is connected with a second detection rod (25) through a bearing. A second probe (26) is arranged at the bottom end of the second detection rod (25). The angles of the first probe (20) and the second probe (26) are arranged oppositely.

7. A measuring instrument for measuring the roundness of the inner and outer rings of an automotive wheel bearing according to claim 6, characterized in that: A linkage gear (27) is fixedly connected to the outer wall of one side of the top of the first detection rod (19). A toothed ring (28) is fixedly connected to the outer ring of the rotating column (17) of the measuring frame (16). The linkage gear (27) is meshed with the toothed ring (28). A first bevel gear (29) is fixedly connected to the outer wall of one side of the bottom of the first detection rod (19) located on the connecting strip (18). A limiting sleeve (30) is fixedly connected to the outer wall of the bottom of the connecting strip (18). A rotating cylinder (31) is connected through the inner wall of the middle of the limiting sleeve (30) by a bearing. A second bevel gear (32) is fixedly connected to the outer wall of one side of the rotating cylinder (31). The second bevel gear (32) is meshed with the first bevel gear (29).

8. A measuring instrument for measuring the roundness of the inner and outer rings of an automotive wheel bearing according to claim 7, characterized in that: On the inner wall of the side of the rotating cylinder (31) away from the second bevel gear (32), a rotating rod (33) is embedded. The rotating cylinder (31) is slidably connected to the rotating rod (33). On the outer wall of one side of the rotating rod (33), an auxiliary sleeve (34) is sleeved, and the rotating rod (33) is connected to the auxiliary sleeve (34) through a bearing. The top end of the auxiliary sleeve (34) is fixedly connected to the limiting block (23). One end of the rotating rod (33) away from the rotating cylinder (31) is fixedly connected to a third bevel gear (35). On the outer wall of one side of the second detection rod (25), a fourth bevel gear (36) is fixedly connected. The fourth bevel gear (36) meshes with the third bevel gear (35).

9. A measuring instrument for measuring the roundness of the inner and outer rings of an automotive wheel bearing according to claim 8, characterized in that: On the outer wall of one side of the top of the rotating rod (33), a strip-shaped groove (37) is provided. On the inner wall of one side of the top of the rotating cylinder (31), a slider (38) is fixedly connected. The slider (38) is embedded in the strip-shaped groove (37), and the slider (38) is slidably connected to the strip-shaped groove (37).

10. A measuring instrument for measuring the roundness of the inner and outer rings of an automotive wheel bearing according to claim 4, characterized in that: On the bottom inner wall of the workbench (1), an exhaust cavity (39) is provided. The exhaust cavity (39) is communicated with the adsorption cavity (3). On one side of the exhaust cavity (39), an exhaust pipe (40) is communicated. The end of the exhaust pipe (40) extends to the outside of the workbench (1). On one side of the middle of the exhaust pipe (40), a communicating pipe (42) is communicated through a three-way valve (41). In the middle of the limiting push plate (143), a blowing cavity (43) is provided. On the surface of the limiting push plate (143), through holes (44) are provided. The through holes (44) are communicated with the blowing cavity (43). The top of the communicating pipe (42) extends above the workbench (1) and is communicated with the blowing cavity (43). On the surface of the limiting push plate (143), a pressure sensor (45) is provided. On one side of the measuring and supporting assembly (13), a receiving and control host (46) is provided. On one side of the receiving and control host (46), a display (47) is electrically connected.

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