Joint bearing center distance self-adaptive measuring tool and use method

Abstract

The invention provides a joint bearing center distance self-adaptive measurement tool and a use method, which can ensure the precision and the measurement speed of joint bearing measurement, and is suitable for the measurement of joint bearings of multiple specifications. The tool comprises a fixed base assembly, a sliding base assembly and a center positioning assembly. A cylindrical sliding rail is arranged on one side of the fixed base assembly. The sliding base assembly is assembled on the sliding rail and can slide, the center positioning assembly is composed of an annular floating sliding way, an annular section sliding groove, a sliding rod, a cam mechanism and a contact screen, a plurality of arc-shaped restraining grooves are formed in the cam mechanism, and the vertical rollers are vertically arranged in the restraining grooves, can slide and are connected with the sliding rod through spherical hinges. A linear through hole is formed in the surface of the upper fixing seat; the vertical roller penetrates through the through hole to be connected with the tensioning claw; the contact screen is laid at the bottom of the cavity; coordinates of the vertical roller are collected in real time;

Description

TECHNICAL FIELD

[0001] The present application relates to the field of joint bearing precision measurement, in particular to a joint bearing center distance adaptive measurement tool and a use method thereof. BACKGROUND

[0002] As a key component of high-precision equipment such as aircraft engines and industrial robots, the center distance size precision of joint bearings (usually within ±0.05 mm) directly affects the equipment motion trajectory precision and service life. However, the traditional measurement technology faces three bottlenecks:

[0003] Structural complexity: the inner / outer ring arc surface matching structure of joint bearings causes dynamic changes in the contact points, which cannot be directly fixed by mechanical positioning pins to measure the reference;

[0004] Precision limitation: the use of rulers and other measurement methods is limited by the radius compensation error of the measuring head, and the actual precision in curved surface measurement is attenuated to ±0.1 mm, which cannot meet the first level precision requirement of national standard for aviation bearings;

[0005] Efficiency short board: manual adjustment of the positioning tool takes more than 70% of the total measurement time, and the single piece measurement time is more than 5 minutes.

[0006] Existing measurement methods include mechanical positioning type measurement tool and automatic measurement equipment.

[0007] Mechanical positioning type measurement tool, for example, representative patent: CN202120423920.X, which realizes the center distance measurement of connecting rod assembly through replaceable positioning pin and sliding groove structure, and its technical features include: split type positioning part: the first positioning part contains fixed pin, and the second positioning part contains sliding block and scale; multi-condition adaptation: through replacing the positioning pin assembly to adapt to the parallel / vertical hole of the connecting rod.

[0008] Such mechanical positioning type measurement tool relies on rigid contact, and the positioning pin and the bearing inner ring are in point contact, which is easy to produce slip error on the arc surface; at the same time, the measurement process does not consider the influence of elastic deformation and temperature drift of the bearing caused by clamping force, resulting in poor measurement accuracy; and the manual intervention degree is high, and the replacement time is 3-5 minutes each time.

[0009] Automatic measurement equipment, for example, representative patent CN222144107U, a kind of automatic measurement equipment of connecting rod small head bottom hole, adopts tool plate and conical probe structure, and directly reads the center distance through scale bar. Its conical head is only suitable for through hole workpiece, and cannot fit the closed arc inner ring of joint bearing. For example, China's aero-engine rotary flexibility detection device, patent publication number: CN119246067A, judges the bearing rotary flexibility through counterweight unit and stepped spindle, only evaluates the motion performance, and does not involve geometric size measurement.

[0010] In summary, the core contradictions of joint bearing center distance measurement mainly focus on:

[0011] 1. Precision and efficiency cannot be achieved simultaneously. High-precision methods such as laser interference rely on complex equipment and cannot be integrated into the production line. High-speed methods such as mechanical tooling will sacrifice precision.

[0012] 2. Lack of dynamic adaptability. Existing tooling cannot compensate for clamping deformation in real time, which accounts for 40% of the error sources and thermal expansion effects.

[0013] 3. Insufficient flexibility. When changing production, recalibration or replacement of fixtures is required. φ20-200mm bearings require more than 5 sets of special tooling, and the clamping process can easily damage the surface of the joint bearing. SUMMARY

[0014] The purpose of the present application is to provide a joint bearing center distance self-adaptive measurement tool and a use method, which can ensure the precision and speed of joint bearing measurement and is suitable for measuring joint bearings of multiple specifications.

[0015] Specifically, the technical scheme of the present application is: a joint bearing center distance self-adaptive measurement tool, comprising:

[0016] A fixed base assembly is provided with one or more sets of cylindrical sliding rails on one side; the fixed base assembly is an upper and lower split assembly structure, including an upper fixed base and a lower fixed base, and the upper and lower fixed bases form an assembly cavity therebetween;

[0017] A sliding base assembly is assembled on the cylindrical sliding rails and is slidable, and the overall structure is the same as that of the fixed base assembly;

[0018] A center positioning assembly comprises:

[0019] An annular floating slide is provided, with its center coinciding with the center of the lower fixed base, and a ring segment sliding groove is formed in the middle layer of the annular floating slide;

[0020] A slide rod is provided transversely in the ring segment sliding groove;

[0021] A cam mechanism is provided at the inner circular bottom of the annular floating slide, and a plurality of arc-shaped constraint grooves are arranged in a circular array outward from the circumference toward the center;

[0022] A vertical roller is vertically arranged in each arc-shaped constraint groove, and the bottom of the vertical roller is slidable based on the arc-shaped constraint groove; the vertical roller and the slide rod are connected by a spherical hinge, the other end of the slide rod is provided with a limiting block with a diameter greater than the width of the ring segment sliding groove, and a disc spring is sleeved on the slide rod; the surface of the upper fixed base is provided with a plurality of straight-line type through holes matched with the movement track of the vertical roller, and the vertical roller is connected to the tension claw after passing through the straight-line type through hole.

[0023] The touch screen is integrally assembled at the bottom of the cavity, and the touch screen collects the coordinates of the bottom of the vertical roller in real time, and the center of the joint bearing is fitted based on three groups of coordinates.

[0024] As a preferred technical solution, the electromagnetic adsorption module is arranged in the tension claw, and the tension claw is tightly attached to the inner ring surface of the joint bearing to be measured when powered on. The electromagnetic adsorption module comprises:

[0025] A soft magnetic alloy patch is arranged on the end surface of the tension claw and the inner ring surface of the joint bearing.

[0026] An excitation coil group is arranged around the end of the vertical roller.

[0027] When powered on, a directional adsorption force perpendicular to the inner ring surface of the joint bearing is generated, and the adsorption force satisfies F=β·B 2 ·A, wherein B is the magnetic induction intensity, A is the contact area of the patch, and β is the electromagnetic coupling coefficient.

[0028] As a preferred technical solution, the laser interferometer is arranged on the fixed base assembly and the sliding base assembly, the touch screen monitors the position of the vertical roller in real time, the laser interferometer synchronously measures the distance between the fixed base and the sliding base, and data is transmitted to the processing module through wired or wireless mode.

[0029] As a preferred technical solution, the self-adaptive measurement tool further comprises a zero calibration module, which comprises:

[0030] A permanent magnet is arranged at the center of the cam mechanism.

[0031] A Hall array is arranged around the lower fixed seat, and when the permanent magnet and the reference Hall element are aligned, a position zero signal is triggered.

[0032] As a preferred technical solution, the bottom of the sliding base assembly is integrated with a fault diagnosis module, which comprises:

[0033] A vibration sensor for detecting abnormal vibration of the sliding rail;

[0034] A temperature sensor for monitoring the temperature rise of the excitation coil assembly.

[0035] As a preferred technical solution, the arc-shaped constraint groove is a involute arc-shaped constraint groove, and the curve of the involute constraint groove satisfies:

[0036] ρ=k·θ+c, wherein ρ is the polar radius, θ is the rotation angle, k is the curvature coefficient, and c is the base circle radius;

[0037] The groove depth satisfies h=h0-α·ρ, wherein h0 is the inlet depth, and α is the depth attenuation coefficient.

[0038] Preferably, a self-lubricating copper-based composite material bushing is arranged between the vertical roll and the arc-shaped constraint groove, and oil storage micro-holes are arranged on the inner wall of the bushing, and a silicon-based lubricating grease is impregnated in the micro-holes.

[0039] The application also provides a method for using the joint bearing center distance self-adaptive measuring tool.

[0040] The three sets of tension claws are synchronously clamped to the inner ring of the joint bearing by rotating cam driving, and the disc spring provides initial pre-tightening force.

[0041] The electromagnetic adsorption module is started, and the adsorption force is adjusted to the set threshold value according to the feedback of the Hall sensor.

[0042] The coordinates of the vertical rolls are obtained through the touch screen, the center of the joint bearing is measured according to the coordinates of the three sets of vertical rolls, the positions of the laser interferometer are set, the distances L1 and L2 from the center to the laser interferometer are calculated, and the distance L3 between the fixed base assembly and the sliding base assembly is read through the laser interferometer.

[0043] The center distance D is equal to L1+L2+L3+delta, and the delta is a dynamic compensation amount based on the spring deformation amount.

[0044] Preferably, the calculation method of the dynamic compensation amount delta comprises:

[0045] Wherein, k is a system calibration coefficient, E is the elastic modulus of the bearing material, t is the thickness of the inner ring, alpha is the thermal expansion coefficient, delta T is the temperature difference, x is the vertical roll coordinate, and x0 is the fitting center. i

[0046] Preferably, the determination method of the adsorption force to the set threshold value comprises:

[0047] The elastic modulus and yield strength in the material database are called according to the input joint bearing model.

[0048] The optimal adsorption force F0 is equal to 0.2*sigma s*S, wherein sigma s is the yield strength, and S is the contact area.

[0049] The application has the following beneficial effects:

[0050] 1. The tool adopts a three-mechanical self-adaptive design of a split base, a ring-shaped floating slide and an involute constraint groove, automatically compensates for the positional deviation of the joint bearing, adopts two-stage force control of disc spring pre-tightening force and electromagnetic adsorption force, ensures that the tension claws and the inner ring of the joint bearing are not intermittently matched, and simultaneously, the intelligent supplementary algorithm calculates the contact pressure based on the compression amount of the disc spring, dynamically corrects the radius value through the pressure and deformation mapping table, eliminates the clamping deformation error, and realizes high-precision dynamic self-adaptive measurement.

[0051] ​2. The tensioning claw position adopts an electromagnetic module of a soft magnetic alloy patch and an excitation coil, generates an adsorption force perpendicular to the inner ring surface of the bearing, avoids mechanical clamping damage to the joint bearing, and can dynamically calculate the optimal adsorption force according to the yield strength of the bearing material, balance the measurement stability and the safety of the workpiece, and realize non-destructive measurement.

[0052] 3. The tool also has a zero calibration module, which detects the reference position of the tool in real time through the permanent magnet in the center of the cam mechanism and the annular Hall array, triggers an automatic zero reset signal, directly captures the stand roll coordinates through the touch screen, fits the center of the circle in real time, measures the base spacing through the laser interferometer, eliminates the mechanical transmission error, calculates the dynamic compensation algorithm, and improves the measurement accuracy. This scheme realizes the whole chain closed loop of "perception-decision-execution" through the touch screen coordinate direct sampling and multi-physical field dynamic compensation, and becomes a new generation of standard solution for high-precision joint bearing measurement. BRIEF DESCRIPTION OF DRAWINGS

[0053] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0054] Figure 1 The joint bearing center distance adaptive measurement tool structure schematic diagram of the embodiment of the present application;

[0055] Figure 2 The cross-sectional structure schematic diagram of the cylindrical slide rail and the slot hole of the embodiment of the present application;

[0056] Figure 3 The center positioning assembly structure schematic diagram of the embodiment of the present application;

[0057] Figure 4 The surface structure schematic diagram of the touch screen of the embodiment of the present application;

[0058] Figure 5 The tensioning claw structure schematic diagram of the embodiment of the present application;

[0059] Figure 6 The surface structure schematic diagram of the magnetic alloy patch of the embodiment of the present application;

[0060] Figure 7 The joint bearing center distance adaptive measurement tool usage method flow chart of the embodiment of the present application.

[0061] BRIEF DESCRIPTION OF DRAWINGS: fixed base assembly 1; cylindrical slide rail 11; guide groove 111; upper fixed seat 12; linear through hole 121; lower fixed seat 13; tension claw 14; soft magnetic alloy patch 141; excitation coil group 142; flexible micro-bump array 143; grid-shaped groove 144; laser interferometer 15; sliding base assembly 2; slot hole 21; display screen 22; guide block 211; center positioning assembly 3; annular floating slide 31; slide rod 32; cam mechanism 33; arc-shaped constraint groove 331; permanent magnet 332; Hall array 333; vertical roller 34; contact screen 35. DETAILED DESCRIPTION

[0062] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0063] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0064] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0065] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0066] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0067] In the description of the present application, it is also necessary to explain that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0068] The embodiment provides a joint bearing center distance adaptive measurement tool which can be assembled in a joint bearing test center for use, and can also be used independently. When used independently, the microprocessor is installed on the fixed base assembly, and a scanner for scanning bearing models can be arranged on the tool; if assembled for use in the test center, the calculation module can be integrated on the processor of the test center. For example, the bearing model is input to automatically call the material database (elastic modulus, yield strength), and generate optimal adsorption force and pressure compensation parameters.

[0069] The whole process is fully digitized, such as clamping through cam synchronous driving and electromagnetic force closed-loop control, measurement using touch screen combined with laser interferometer measurement collection, dynamic algorithm correction compensation result output, and the whole process can be traced.

[0070] Example 1

[0071] See Figures 1-6 , the embodiment takes the joint bearing center distance adaptive measurement tool used independently as an example, and the tool comprises: a fixed base assembly 1, a sliding base assembly 2, and a center positioning assembly 3 arranged in the fixed base assembly 1 and the sliding base assembly 2 and used for assembling and measuring the radius of the joint bearing.

[0072] One side wall of the fixed base assembly 1 is provided with two groups of cylindrical sliding rails 11 in the middle, the side wall of the sliding base assembly 2 is provided with slot holes 21 for assembling the cylindrical sliding rails 11, and in order to ensure the consistency of the movement path of the sliding base, guide grooves 111 can also be arranged on the cylindrical sliding rails 11, and the inner wall of the corresponding slot hole 21 is provided with a guide block 211 matched in shape with the guide groove 111.

[0073] The fixed base assembly 1 is an upper and lower split assembly structure, comprising an upper fixed seat 12 and a lower fixed seat 13, and the upper and lower fixed seats 13 form an assembly cavity therebetween for assembling the center positioning assembly 3. The split base design is adopted, the upper and lower fixed seats 13 are quickly assembled through the positioning columns and the positioning grooves arranged at four corners, and different sizes of bearings are adapted. Laser interferometers 15 are arranged on each base assembly.

[0074] The center positioning assembly 3 comprises a ring-shaped floating slide 31, a slide rod 32, a cam mechanism 33, a vertical roller 34 and a touch screen 35. The ring-shaped floating slide 31 is arranged at the bottom of the assembly cavity, the center of the ring-shaped floating slide 31 coincides with the center of the lower fixed seat 13, and three ring segment slide grooves are arranged at the middle layer of the ring-shaped floating slide 31 for assembling the slide rod 32. Each slide rod 32 is arranged transversely in a ring segment slide groove.

[0075] The cam mechanism 33 is arranged at the inner circular bottom of the ring-shaped floating slide 31, three arc-shaped constraint grooves 331 are arranged in a circular array at the circumferential outer edge and towards the center, the arc-shaped constraint grooves 331 are through grooves 21, the vertical roller 34 is vertically arranged in each arc-shaped constraint groove 331, the bottom of the vertical roller 34 is slidable based on the arc-shaped constraint groove 331, the vertical roller 34 and the slide rod 32 are connected by a spherical hinge, the problem of back difference of the traditional mechanism under a small displacement is solved, the other end of the slide rod 32 is provided with a limiting block with a diameter larger than the width of the ring segment slide groove, and a disc spring is sleeved on the slide rod 32. The surface of the upper fixed seat 12 is provided with a plurality of linear through holes 121 matched with the movement track of the vertical roller 34, and the vertical roller 34 passes through the linear through hole and is connected with the tension claw.

[0076] Specifically, the arc-shaped constraint groove 331 is an involute arc-shaped constraint groove 331, which is used to realize the optimized balance of displacement accuracy and torque, and three sets of tension claws are radially synchronous through the involute constraint groove. The curve of the involute constraint groove satisfies: ρ=k·θ+c, wherein ρ is the polar radius, θ is the rotation angle, k is the curvature coefficient, and c is the base circle radius. The groove depth satisfies: h=h0-α·ρ, wherein h0 is the inlet depth, and α is the depth attenuation coefficient.

[0077] The existing tooling mostly adopts linear grooves or circular arc grooves, and the involute curve design of the embodiment realizes the optimized balance of displacement accuracy and torque, cooperates with the spherical hinge to eliminate the deflection jamming of the vertical roller 34, and solves the problem of back difference of the traditional mechanism under a small displacement.

[0078] The mechanical part of the tooling adopts a three-layer adaptive structure: a split base provides assembly flexibility, a ring-shaped slide realizes radial floating, and an involute constraint groove ensures synchronization.

[0079] Further, a self-lubricating copper-based composite material bushing is arranged between the vertical roller 34 and the arc-shaped constraint groove 331, oil storage micropores are arranged on the inner wall of the bushing, silicon-based lubricating grease is impregnated in the micropores, long-acting lubrication and wear resistance are adapted to high-frequency sliding working conditions, the vertical roller 34 is prevented from jamming during movement, and the service life of the vertical roller 34 is improved.

[0080] The touch screen 35 is integrally assembled at the bottom of the assembly cavity, the touch screen 35 collects the coordinates of the bottom of the vertical roller 34 in real time, and the center of the joint bearing is fitted based on the three sets of coordinates.

[0081] The specific structure of the tensioning claw 14 is not limited, and the joint bearing can be clamped. By built-in electromagnetic adsorption module, the tensioning claw 14 is tightly attached to the inner ring surface of the joint bearing to be measured when energized. The electromagnetic adsorption module includes: a soft magnetic alloy patch 141 arranged on the end face of the tensioning claw 14 and the joint bearing inner ring surface, and an excitation coil group 142 arranged around the end of the vertical roller 34, to avoid mechanical clamping damage to the surface; when energized, a directional adsorption force perpendicular to the inner ring surface of the joint bearing is generated, and the adsorption force satisfies F = β·B 2 ·A, wherein B is the magnetic induction intensity, A is the patch contact area, and β is the electromagnetic coupling coefficient.

[0082] In the joint bearing clamping process of the embodiment, the electromagnetic adsorption provides active fitting force, and the spring provides passive buffering, and the two cooperate to overcome the measurement jitter caused by vibration. The thickness of the soft magnetic alloy patch 141 is at least 5mm, which can fit the bearing inner ring curved surface and eliminate mechanical slip error.

[0083] More specifically, the soft magnetic alloy patch 141 in the embodiment adopts a gradient structure, the surface layer is used to contact the bearing surface: a soft, high magnetic permeability, high ductility, high wear resistance soft magnetic alloy such as treated permalloy or nanocrystalline alloy thin layer, thickness 0.5-1mm, which ensures extremely flexible fitting of the curved surface, maximizes the contact area, and provides initial high friction. The middle layer: a soft magnetic material that takes into account the magnetic permeability and strength, such as silicon steel sheet or iron-based amorphous alloy, thickness 2-3mm, which conducts main magnetic flux and provides partial structural support. The bottom layer is used to connect the tensioning claw body, which adopts a high-strength, high-permeability soft magnetic material such as low-carbon steel or other specific soft magnetic stainless steel, thickness 1-2mm, which provides stable connection and mechanical support.

[0084] Further, the surface of the soft magnetic alloy patch 141 is also provided with a flexible micro-bump array 143, which is processed with dense, micron-level elastic bumps on the surface. High-elasticity soft magnetic composite material or surface elastic coating can be used, and the bump height is slightly larger than the surface roughness. A fine radial or grid-shaped groove 144 is arranged around the flexible micro-bump array 143, which allows the material to produce slight deformation when pressed, and better fills the micro-uneven surface of the bearing inner ring. A thin back plate made of high-permeability material can also be added between the soft magnetic alloy patch 141 and the tensioning claw 14 body to reduce magnetic leakage and improve magnetic energy utilization.

[0085] The top and bottom of the tension claw 14 in the embodiment are provided with multiple independent or semi-independent claw petals, each claw petal is independently connected to the tension claw main frame through a flexible hinge, a micro linear bearing + spring or a small hydraulic / pneumatic cylinder. Each claw petal can independently adapt to the curved surface shape and possible slight non-circularity of the inner ring of the knuckle bearing, realizing true full-surface fitting. The local stress concentration and potential damage caused by bearing or claw body manufacturing errors are significantly reduced. The clamping force and adsorption force are more evenly distributed.

[0086] The adaptive measurement tool further comprises a zero calibration module, which comprises a permanent magnet 332 arranged at the center of the cam mechanism 33 and a Hall array 333 arranged around the lower fixed base 13. When the permanent magnet 332 and the reference Hall element are aligned, a position zeroing signal is triggered. The permanent magnet 332 at the center of the cam mechanism 33 and the annular Hall array 333 are calibrated automatically, the reference position of the tool is detected in real time, and an automatic zeroing signal is triggered.

[0087] The permanent magnet 332 in the embodiment is embedded in the rotating axis of the cam mechanism 33, and a neodymium-iron-boron N52 grade magnet is used, with a residual magnetism ≥1.4T and an axial deviation ≤0.1mm. The 120° annular is uniformly distributed around the lower fixed base 13, containing 12 groups of high-precision linear Hall elements, with a sensitivity of 1.5mV / G and an angle resolution of 0.1°. The reference Hall element is located at the 0° reference position, parallel to the slide rail axis, with a gold-plated shielding layer to resist electromagnetic interference. The zeroing is triggered only when the deviation of the three groups of measurement rings is ≤5%.

[0088] When the maximum magnetic force H is continuously <0.8T, it is determined that the permanent magnet is demagnetized, the system is alarmed and locked; when the output difference of adjacent elements is >30%, it is determined that the Hall element is failed, and the standby group is automatically switched. The zero calibration module uses a 12-point Hall array to construct a 0° magnetic field gradient model, with a 0.1° angle resolution to achieve sub-micron positioning.

[0089] The sliding base assembly 2 is assembled on the cylindrical slide rail 11 and is slidable, and the overall structure is basically the same as that of the fixed base assembly 1, which is also an upper and lower split assembly structure, and is internally provided with a center positioning assembly 3. The difference is that the sliding base assembly 2 is additionally provided with a slot hole 21 for assembling the cylindrical slide rail 11, and is internally integrated with a fault diagnosis module, and a display screen 22 is arranged on the surface of the upper sliding seat.

[0090] The fault diagnosis module is arranged at the bottom of the sliding base assembly 2 and comprises a vibration sensor 23 for detecting abnormal vibration of the slide rail and a temperature sensor 24 for monitoring the temperature rise of the excitation coil group 142. The display screen 22 is used to display the center distance output value and the possible error sources.

[0091] Further fault diagnosis module integrates three-axis acceleration sensor array, through arranging 3 groups of high-precision MEMS sensors (range ±50g, bandwidth 0.5-10kHz) in the X / Y / Z direction of the base, real-time collection of guide rail movement characteristics: X-axis: monitor motor driving synchronization, used for diagnosing encoder step loss; Y-axis: detect the lateral impact of the slider, used for early warning of ball bearing fragmentation; Z-axis: perceive the abnormality of guide rail flatness, used for identifying track settlement or foreign matter jamming.

[0092] The transmission cable of the sensor and other electromagnetic components used in the embodiment adopts double-layer shielding, the inner layer is copper mesh, and the outer layer is ferrite magnetic ring, the signal-to-noise ratio is >80dB, which ensures electromagnetic compatibility. The vibration sensor is installed on a silica gel damping base, and the resonance frequency is <100Hz, avoiding high-frequency mechanical interference.

[0093] Example 2

[0094] The embodiment further describes the unique use method of the joint bearing center distance adaptive measurement tool provided in the first embodiment, please refer to Figure 7 , including:

[0095] S1: zero calibration and initial clamping

[0096] The three sets of tension claws 14 are synchronously clamped to the inner ring of the joint bearing by the rotary cam, the disc spring provides the initial pre-tightening force, the Hall array detects the position of the permanent magnet, and determines |H max -H0|≤5%H0, if satisfied, a position zero clearing signal is triggered; if not satisfied, the cam is fine-tuned until the standard is reached.

[0097] S2: precise regulation of electromagnetic adsorption force

[0098] Start the electromagnetic adsorption module, adjust the adsorption force to the set threshold value according to the Hall sensor feedback, wherein the determination method of the adsorption force to the set threshold value includes: inputting the joint bearing model, calling the elastic modulus and yield strength in the material database; optimal adsorption force, wherein σs is the yield strength, and S is the contact area.

[0099] S3: circle center positioning and distance solving

[0100] The coordinates of each edger roll 34 are obtained through the touch screen, and the circle center of the joint bearing is measured according to the coordinates of the three sets of edger rolls 34.

[0101] Wherein, the three edger roll coordinates are (x1, y1), (x2, y2), and (x3, y3), and the circle center is solved as follows:

[0102] (x0-x1) 2 +(y0-y1) 2 =R 2 ;

[0103] (x0-x2) 2 +(y0-y2) 2 =R 2 ;

[0104] (x0-x3) 2 +(y0-y3) 2 =R 2 .

[0105] The least square method is used to iteratively optimize the R value, so as to obtain the joint bearing circle center, and the positions of the laser interferometer 15 are combined to calculate the distances L1 and L2 from the laser interferometer 15 to the circle center;

[0106] The distance L3 between the fixed base assembly 1 and the sliding base assembly 2 is read by the laser interferometer 15, the center distance D is L1+L2+L3+delta, and delta is a dynamic compensation amount based on a spring deformation amount.

[0107] The calculation method of the dynamic compensation amount delta includes: Wherein, k is a system calibration coefficient, E is the elastic modulus of the bearing material, t is the inner ring thickness, alpha is the thermal expansion coefficient, delta T is the temperature difference, xi is the coordinate of the vertical roller 34, x0 is the fitting circle center, the dynamic compensation amount is recalculated by calculating the elastic deformation, thermal expansion and contact screen 35 eccentricity correction, so as to improve the calculation accuracy of the center distance, and the measurement accuracy can reach the highest level of national standard of aviation bearings.

[0108] In summary, the intelligent measurement mode of the full closed loop is adopted, the manual intervention is reduced, the vertical roller coordinates are respectively obtained by the fusion of the contact screen and the laser interferometer 15 to real-time fit the accurate circle center, the base distance measured by the laser interferometer 15 can eliminate the mechanical transmission error, the dynamic compensation algorithm is combined, and the accuracy is greatly improved; the tool adopts a micro-vibration and electromagnetic attraction adjustment mode to prevent sliding rail jamming and other faults, the Hall array automatic zero clearing mode is adopted to eliminate the positioning drift, the system fault self-healing is ensured, and more than 20 bearing sizes are self-adaptive, and the change type time is greatly reduced.

[0109] This specification describes examples of embodiments of the application and is not meant to suggest that these embodiments are complete without all of the further options and features set forth therein. It is understood that various alternatives to the embodiments described herein can be employed in practicing the application. The drawings are not necessarily to scale; the dimensions of some features can have been exaggerated for the sake of clarity and convenience in presenting a description of some embodiments. The specific structural and functional details disclosed within the specification are not to be construed as limiting, but as representative of representative embodiments of the present application. Those skilled in the art will appreciate from the following description and drawings that various modifications can be made to the application without departing from the scope thereof. The scope of the present application is not to be construed as limited only to the embodiments described herein. Features from one embodiment can be combined with features from another embodiment. The description is presented in the order of appearing in the drawings and is made in the course of a conceptual description process which will assist in achieving an understanding of the application.

[0110] The above description is only preferred embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A center distance adaptive measuring tool for a knuckle bearing, characterized by, The application relates to a self-adaptive measurement tool for a joint bearing, which comprises a fixed base assembly, a sliding base assembly, a center positioning assembly, a touch screen and a zero calibration module. The fixed base assembly is provided with one or more groups of cylindrical slide rails on one side, and the fixed base assembly is an upper and lower split assembly structure comprising an upper fixed base and a lower fixed base. The sliding base assembly is assembled on the cylindrical slide rails and is slidable. The center positioning assembly comprises a ring-shaped floating slide, a slide rod, a cam mechanism and a vertical roller. The ring-shaped floating slide is arranged at the center of the lower fixed base. The slide rod is arranged in the ring segment sliding groove of the ring-shaped floating slide. The cam mechanism is arranged at the inner circle bottom of the ring-shaped floating slide. The vertical roller is arranged in each arc-shaped constraint groove. The vertical roller and the slide rod are connected through a spherical hinge.

2. The constant velocity universal joint center distance adaptive measuring tool of claim 1, wherein, The other end of the slide rod is provided with a limiting block with a diameter larger than the width of the ring segment sliding groove. The slide rod is sleeved with a disc spring. The surface of the upper fixed base is provided with a plurality of linear through holes matched with the movement track of the vertical roller. When energized, a directed attractive force is generated perpendicular to the inner ring face of the joint bearing, which meets F = β · B 2 · A, where B is the magnetic induction, A is the patch contact area, and β is the electromagnetic coupling coefficient.

3. The constant velocity universal joint center distance adaptive measuring tool of claim 1, wherein, The vertical roller is connected with a tension claw after penetrating through the linear through hole.

4. The constant velocity universal joint center distance adaptive measuring tool of claim 1, wherein, The tension claw is provided with an electromagnetic adsorption module. The electromagnetic adsorption module comprises a soft magnetic alloy patch arranged on the end face of the tension claw and the inner ring surface of the joint bearing. The electromagnetic adsorption module comprises an excitation coil group arranged around the end of the vertical roller.

5. The constant velocity articulating bearing center distance adaptive measuring tool of claim 1, wherein, The fixed base assembly and the sliding base assembly are provided with a laser interferometer. The touch screen monitors the position of the vertical roller in real time. The laser interferometer synchronously measures the distance between the fixed base and the sliding base.

6. The constant velocity universal joint center distance adaptive measuring tool of claim 1, wherein, The data is transmitted to a processing module through a wired or wireless mode. The self-adaptive measurement tool further comprises a zero calibration module. The zero calibration module comprises a permanent magnet arranged at the center of the cam mechanism and a Hall array arranged around the lower fixed base.

7. The constant velocity universal joint center distance adaptive measuring tool of claim 1, wherein, When the permanent magnet and the reference Hall element are aligned, a position zero clearing signal is triggered.

8. A method of using a center distance adaptive measuring tool for a knuckle bearing, the method comprising: The bottom of the sliding base assembly is integrated with a fault diagnosis module. The fault diagnosis module comprises a vibration sensor for detecting abnormal vibration of the slide rail and a temperature sensor for monitoring the temperature rise of the excitation coil assembly. The arc-shaped constraint groove is a involute arc-shaped constraint groove. The curve of the involute constraint groove satisfies the formula: rho=k*theta+c, wherein rho is the polar radius, theta is the rotation angle, k is the curvature coefficient, and c is the base circle radius. The groove depth satisfies the formula: h=h0-alpha*rho, wherein h0 is the inlet depth, and alpha is the depth attenuation coefficient. A self-lubricating copper-based composite material bushing is arranged between the vertical roller and the arc-shaped constraint groove. The inner wall of the bushing is provided with oil storage micropores, and the micropores are impregnated with silicon-based lubricating grease. The application further discloses a method for measuring a joint bearing. The method comprises the following steps: The three groups of tension claws are synchronously clamped to the inner ring of the joint bearing through the rotation of the cam. The initial pre-tightening force is provided by the disc spring. The electromagnetic adsorption module is started. The adsorption force is adjusted to a set threshold value according to the feedback of the Hall sensor. The coordinates of each vertical roll are obtained through the touch screen, the center of the joint bearing is measured according to the three sets of vertical roll coordinates, and the distances L1 and L2 from the center to the laser interferometer are calculated in combination with the setting position of the laser interferometer; The distance L3 between the fixed base assembly and the sliding base assembly is read by the laser interferometer, the center distance D = L1 + L2 + L3 + δ, and δ is a dynamic compensation amount based on the spring deformation amount.

9. The method of using a constant velocity joint bearing center distance adaptive measuring tool of claim 8, wherein, The calculation method of the dynamic compensation amount δ includes: where k is a system calibration coefficient, E is the modulus of elasticity of the bearing material, t is the inner ring thickness, a is the thermal expansion coefficient, AT is the temperature difference, x i is the vertical roll coordinate, and x0is the center of the fitted circle.

10. The method of using a constant velocity joint bearing center distance adaptive measuring tool of claim 8, wherein, The determination method of the adsorption force to the set threshold value includes: The elastic modulus and yield strength in the material database are called by inputting the joint bearing model. The optimal adsorption force F0 = 0.2 · σs · S, wherein σs is the yield strength, and S is the contact area.

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