A multi-probe measuring device and method for measuring roughness of a brake disc friction surface

Abstract

This invention relates to the field of brake disc roughness testing technology, specifically to a multi-probe measuring device and method for brake disc friction surface roughness. The device includes a frame, a rotary drive assembly, a tensioning and positioning assembly, and six measuring units. Each measuring unit includes a drive housing and a measuring drive assembly. The measuring drive assembly includes a drive frame that displaces radially along the brake disc. A swing seat is hinged to the drive frame. A probe housing is fixed to the swing seat, and a detection probe is installed inside the probe housing. An adjustment frame is slidably mounted on the drive frame. A micro-motion drive assembly is installed on the adjustment frame, including two synchronous eccentric wheels for driving the probe housing and causing the swing seat to reciprocate horizontally. A micro-motion adjustment assembly is installed on the drive frame to change the distance between the adjustment frame and the swing seat, thereby controlling the swing amplitude of the probe housing. This achieves multi-dimensional, full-coverage acquisition of the brake disc's planar friction surface, adaptable to the testing conditions of brake discs of different specifications.

Description

Technical Field

[0001] This invention relates to the field of brake disc roughness detection technology, specifically to a multi-probe measuring device and method for measuring the roughness of brake disc friction surfaces. Background Technology

[0002] Traditional methods for testing brake disc roughness often employ single-point static sampling, which can only collect data from a small local area of ​​the friction surface. This results in limited coverage and an inability to fully reflect the microscopic morphology of the entire brake disc friction surface. Consequently, it is easy to miss local machining defects and texture differences, leading to biased test data and insufficient accuracy in judgment.

[0003] Chinese invention patent CN112461120B discloses a surface roughness tester, comprising: a stylus unit including a stylus and a stylus displacement detection unit, wherein the stylus is arranged to protrude from and retract into a through hole of a sliding portion and performs scanning motion along the surface of the workpiece, and the stylus displacement detection unit is configured to detect the displacement of the stylus; and a drive unit that moves the stylus unit back and forth in the drive axis direction. The surface roughness tester also includes a height detector, which is arranged facing the front end face of the main body receiving portion and with the sliding portion positioned between the height detector and the front end face, and the height detector detects the height of the object in a direction parallel to the measurement axis. When the height detector detects that the height of the object in the measurement axis direction is the same as the height of the main body support foot, the drive unit automatically starts driving, thereby causing the stylus unit to scan and measure the workpiece surface. In existing technologies, the stylus can only perform radial linear motion along a fixed trajectory, lacking a horizontal arc-shaped micro-motion composite scanning function. It cannot comprehensively collect the full-domain morphological features of the interlaced processing texture and irregular micro-concave-convex surface of the brake disc friction surface. The detection data is one-sided and cannot truly reflect the roughness state of the friction surface. The stylus's movement stroke and trajectory are fixed and cannot be adaptively adjusted according to the differences in surface texture and surface roughness level of the brake disc. Summary of the Invention

[0004] To solve the problems of the prior art, the technical solution adopted by the present invention is as follows: This invention provides a multi-probe measuring device for the roughness of a brake disc friction surface, comprising a frame, a rotary drive assembly mounted at the center of the frame for driving the brake disc to rotate around an axis, and a tensioning and positioning assembly mounted on the rotary drive assembly for radial positioning of the brake disc. It also includes: six measuring units, each divided into three groups, arranged at 120° intervals circumferentially along the brake disc friction surface; each measuring unit includes: a drive housing; a measuring drive assembly disposed within the drive housing, including a drive frame that displaces along the radial length of the brake disc; a swing seat hinged to the drive frame; a probe housing mounted within the drive housing and fixedly connected to the swing seat, the probe housing containing a detection probe; an adjustment frame slidably mounted on the drive frame; a micro-motion drive assembly mounted on the adjustment frame, including two eccentric wheels synchronously disposed on both sides of the probe housing and in contact with the outer surface of the probe housing, the two eccentric wheels driving the probe housing to reciprocate horizontally with the swing seat; and a micro-motion adjustment assembly mounted on the drive frame for changing the distance between the adjustment frame and the swing seat, controlling the swing amplitude of the probe housing.

[0005] Preferably, the outer wall of the eccentric wheel is provided with an arc-shaped groove that fits the probe shell, and the arc-shaped groove is provided with an elastic abutment rib.

[0006] Preferably, the micro-motion drive assembly further includes a micro-motion motor, an eccentric shaft, and a synchronous belt. The micro-motion motor is fixedly mounted on the adjustment frame, and the two eccentric shafts are respectively connected to the eccentric parts of the two eccentric wheels. Each of the two eccentric shafts is fixedly equipped with a synchronous pulley that is synchronously driven by the synchronous belt.

[0007] Preferably, the micro-motion adjustment assembly includes a spacing adjustment electric cylinder and a push rod. The spacing adjustment electric cylinder is fixedly mounted on the drive frame. The two ends of the push rod are respectively fixedly connected to the spacing adjustment electric cylinder and the adjustment frame. The drive frame is provided with first sliding grooves on both sides of the push rod. The adjustment frame is slidably connected in the two first sliding grooves. The adjustment frame is provided with damping micro-positioning beads that match the first sliding grooves. The bottom of the first sliding groove is provided with multiple positioning recesses at equal intervals along the length direction. The damping micro-positioning beads are used to embed into the corresponding positioning recesses and realize the non-movement self-locking position after the swing amplitude of the detection probe is adjusted.

[0008] Preferably, the swing seat is provided with arc-shaped guide sliders on both sides, and the drive frame is provided with arc-shaped limiting grooves corresponding to the arc-shaped guide sliders, and the arc-shaped guide sliders swing and cooperate within the corresponding arc-shaped limiting grooves.

[0009] Preferably, the top of the swing seat is provided with a pin hole, and the drive frame is provided with an electromagnetic locking pin corresponding to the pin hole.

[0010] Preferably, the swing base is connected to the probe housing by two adaptive follow-up guide springs, and the adaptive follow-up guide springs are fixedly connected to the swing base.

[0011] Preferably, the adaptive follow-up guide spring is made of beryllium copper alloy and is divided into a fixed section installed on the swing seat, an arc-shaped guide section that provides Z-axis floating, and a correction and fitting section that supports the probe shell.

[0012] Preferably, the frame is provided with three circumferentially distributed measuring instrument drive mechanisms. Each measuring instrument drive mechanism includes a support frame and a mounting frame fixedly installed on the frame. The mounting frame is provided with a linear sliding table for driving the support frame to move radially along the brake disc. The support frame is vertically fixed with two lifting cylinders facing opposite directions. The output end of the lifting cylinder is fixedly connected to the corresponding drive housing.

[0013] A method for measuring the roughness of brake disc friction surfaces using multiple probes is also provided, comprising the following steps: S1: Workpiece positioning, assemble the brake disc into the tensioning and positioning assembly, complete the radial centering and tensioning of the brake disc, and rotate the drive assembly to calibrate the brake disc to the initial circumferential position; S2: Radial probe feed, the measuring instrument drive mechanism drives the probe housing to move, so that the probe housing is close to the brake disc, the measuring drive assembly drives the drive frame to move radially linearly along the brake disc, and drives the detection probe to approach the friction surface measurement area of ​​the brake disc; S3: Measurement mode decoupling switch, which switches between pure radial linear displacement measurement mode or composite measurement mode of radial linear displacement and horizontal arc swing through the locking and unlocking action of electromagnetic locking pin and swing seat. S4: Swing amplitude preset control, the micro-motion adjustment component drives the adjustment frame to slide along the drive frame, changing the relative distance between the adjustment frame and the swing seat to set the swing amplitude of the detection probe, and the swing amplitude is self-locked without slippage through the damped micro-positioning bead and positioning pit; S5: Six probes perform synchronous measurement. The six measurement units work synchronously with a 120° circumferential distribution. The detection probe performs continuous radial linear displacement measurement along the friction surface of the brake disc. In the composite measurement mode, the double-sided synchronous eccentric wheels drive the probe shell to swing horizontally back and forth in the same phase. The adaptive follow-up guide spring synchronously realizes the Z-axis adaptive floating and normal constant force correction of the detection probe. S6: Roughness data acquisition and acceptance judgment. Acquire the surface morphology signals of each detection probe, extract the characteristic parameters, and take the maximum value of the measurement area of ​​each friction surface of the brake disc to complete the acceptance judgment. S7: After the measurement is completed, the measuring instrument drive mechanism drives the probe housing to reset, and the measuring drive component drives the drive frame to reset radially, completing a single measurement process.

[0014] The advantages of this invention compared to the prior art are: 1. This invention employs six sets of measurement units, which can simultaneously complete radial linear and micro-area oscillation measurements of the upper and lower friction surfaces of the brake disc. The measurement units are driven by a swing seat hinged on the drive frame, while the adjustment frame is equipped with eccentric wheels on both sides to form a close-fitting micro-motion drive. The rotational motion of the eccentric wheels is converted into the horizontal reciprocating oscillation of the swing seat driven by the probe shell. Through the composite motion trajectory of linear displacement superimposed with horizontal arc oscillation, a multi-dimensional full-coverage acquisition of the brake disc plane friction surface is formed, effectively avoiding the problems of missed detection in a single path and incomplete micro-morphological characterization, and improving the accuracy and comprehensiveness of roughness detection.

[0015] 2. The micro-motion adjustment component drives the adjustment frame to slide, changing the distance between the micro-motion drive structure on the adjustment frame and the swing seat. This mechanically controls the swing amplitude of the detection probe. Combined with the electromagnetic locking pin, it enables switching between pure linear measurement and arc-shaped micro-motion composite measurement modes. With adjustable swing amplitude and switchable detection modes, it can adapt to the detection conditions of brake discs with different surface textures and roughness levels, significantly expanding the equipment's applicability.

[0016] 3. An adaptive follow-up guide spring is installed between the swing seat and the probe housing. The elastic deformation is used to realize the transmission gap compensation and the correction action of the detection probe. It can offset the transmission gap caused by component wear for a long time, and continuously maintain the perpendicular contact state between the detection probe and the workpiece plane, reducing the detection error caused by angular deviation. A damping auxiliary positioning is set between the adjustment frame and the drive frame, which has a self-locking anti-slip function after the swing amplitude is adjusted. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a multi-probe measuring device for the roughness of brake disc friction surfaces. Figure 2 This is a top view of a multi-probe measuring device for measuring the roughness of brake disc friction surfaces. Figure 3 This is a three-dimensional structural diagram of a measuring unit in a multi-probe measuring device for the roughness of a brake disc friction surface; Figure 4 This is a front view of the drive housing in a multi-probe measuring device for brake disc friction surface roughness. Figure 5 A schematic diagram of a partial three-dimensional structure of a measuring unit in a multi-probe measuring device for brake disc friction surface roughness. Figure 1 ; Figure 6 yes Figure 5 The front view; Figure 7 A schematic diagram of a partial three-dimensional structure of a measuring unit in a multi-probe measuring device for brake disc friction surface roughness. Figure 2 ; Figure 8 yes Figure 7 Partial 3D exploded view; Figure 9 This is a three-dimensional structural diagram of the micro-motion drive component and the micro-motion adjustment component in a multi-probe measuring device for the roughness of the friction surface of a brake disc; Figure 10 This is a front view of the micro-motion drive component in a multi-probe measuring device for the roughness of the friction surface of a brake disc; Figure 11 yes Figure 8 Enlarged view of point A in the middle.

[0018] The numbers on the map are: 1. Frame; 2. Rotary drive assembly; 3. Tensioning and positioning assembly; 4. Measuring unit; 5. Drive housing; 6. Drive frame; 7. Swing seat; 8. Probe housing; 9. Detection probe; 10. Adjustment frame; 11. Eccentric wheel; 12. Arc groove; 13. Elastic contact rib; 14. Micro motor; 15. Eccentric shaft; 16. Synchronous belt; 17. Spacing adjustment cylinder; 18. Push rod; 19. First slide groove; 20. Damped micro positioning bead; 21. Positioning recess; 22. Arc guide slider; 23. Arc limit groove; 24. Pin hole; 25. Electromagnetic locking pin; 26. Adaptive follow-up guide spring; 27. Support frame; 28. Linear actuator; 29. ​​Linear movement slide; 30. Lifting cylinder; 31. Mounting frame. Detailed Implementation

[0019] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0020] Example like Figures 1-11 The device shown is a multi-probe measuring device for the roughness of the friction surface of a brake disc, comprising a frame 1, a rotary drive assembly 2, a tensioning and positioning assembly 3, and six measuring units 4.

[0021] The rotary drive assembly 2 is installed at the center of the frame 1 to drive the brake disc to rotate around the axis; the tensioning and positioning assembly 3 is installed on the rotary drive assembly 2 to perform radial positioning of the brake disc; the six measuring units 4 are divided into three groups that correspond one-to-one and are arranged in a circumferential distribution at 120° along the friction surface of the brake disc.

[0022] Specifically, the measuring unit 4 includes a drive housing 5, within which a measuring drive assembly is installed. The measuring drive assembly includes a drive frame 6 that moves radially along the brake disc. A swing seat 7 is hinged to the drive frame 6. A probe housing 8, fixedly connected to the swing seat 7, is installed inside the drive housing 5. A detection probe 9 is installed inside the probe housing 8. An adjustment frame 10 is slidably mounted on the drive frame 6. A micro-motion drive assembly is installed on the adjustment frame 10. The micro-motion drive assembly includes two eccentric wheels 11 that are synchronously arranged on both sides of the probe housing 8 and are in contact with the outer surface of the probe housing 8. The two eccentric wheels 11 are used to drive the probe housing 8 and drive the swing seat 7 to perform horizontal reciprocating swing. A micro-motion adjustment assembly is installed on the drive frame 6. This micro-motion adjustment assembly is used to change the distance between the adjustment frame 10 and the swing seat 7, thereby controlling the swing amplitude of the probe housing 8.

[0023] In this invention, the tensioning and positioning component 3 clamps and supports the brake disc, preferably a three-jaw chuck, the specific details of which will not be elaborated further. The rotary drive component 2 is prior art, such as... Figure 2 The main components include a drive motor, a rotating base, and a mounting bracket. The drive motor and the rotating base are connected by a belt drive mechanism. The mounting bracket is fixed to the frame 1, and the drive motor is fixed to the mounting bracket. The rotating base is rotatably connected to the mounting bracket. The tensioning and positioning assembly 3 is fixed to the rotating base, thus enabling the brake disc to rotate. Further details are omitted. Six sets of measuring units 4 are arranged in a 120-degree circular array along the circumference of the brake disc, with three sets corresponding to each other at the top and bottom. This allows for simultaneous acquisition and detection of multiple measurement areas on the upper and lower friction surfaces of the brake disc, adapting to the needs of automated batch production testing. The measurement drive component outputs a linear driving force and acts on the drive frame 6, causing the drive frame 6 to form a stable linear displacement along the diameter of the brake disc. This drives the detection probe 9 to complete the radial linear displacement measurement, realizing the linear full-domain topography acquisition of the friction surface. The swing seat 7 and the drive frame 6 are hinged together, giving the swing seat 7 a controllable horizontal swing degree of freedom, providing a structural basis for the composite motion of the detection probe 9. The probe shell 8 is rigidly fixed to the swing seat 7, and can synchronously form angular offset and reciprocating swing motion with the swing seat 7, ensuring the synchronous and unified motion posture of the detection probe 9.

[0024] The adjustment frame 10 is slidably mounted on the surface of the drive frame 6. The micro-motion drive assembly is integrated and installed on the adjustment frame 10. The eccentric wheels 11, which are symmetrically arranged and synchronously pressed against the outer wall of the probe housing 8, are used to convert the circumferential rotation of the eccentric wheels 11 into the arc-shaped deflection and swinging motion of the probe housing 8 with the swing seat 7. This expands the detection trajectory of the detection probe 9 from a single straight path to a composite nonlinear path with straight lines superimposed on horizontal micro-motions. This allows for the acquisition of multi-dimensional surface response signals in the same area, avoiding the defects of missed detection and incomplete texture characterization caused by a single radial straight path. The micro-motion adjustment component and the adjustment frame 10 form a transmission linkage, which can actively drive the adjustment frame 10 to produce a sliding displacement relative to the drive frame 6, and change the relative distance between the micro-motion drive component and the swing seat 7 in real time. The position of the eccentric wheel 11 serves as the power transmission fulcrum, the hinge position of the swing seat 7 serves as the swing hinge fulcrum, the horizontal distance between the power transmission fulcrum and the swing seat 7 serves as the power transmission arm, and the distance between the fixed position of the swing seat 7 and the probe housing 8 and the swing hinge fulcrum serves as the swing lever arm. By adjusting the distance between the power transmission fulcrum and the swing hinge fulcrum, the ratio of the swing lever arm to the power transmission arm is mechanically changed, thereby continuously adjusting the stroke amplitude of the horizontal swing of the probe housing 8. The micro-motion stroke can be adaptively switched according to the differences in rust, texture depth, and roughness level of the brake disc surface, thus broadening the universal adaptability range of the device.

[0025] Specifically, such as Figures 4 to 6 As shown, the measurement drive assembly also includes a linear actuator 28, which is preferably a linear cylinder. The output end of the linear actuator 28 is fixedly connected to the drive frame 6, which slides on a linear guide rail, which is fixed inside the drive housing 5, thereby driving the drive frame 6 to move horizontally within the drive housing 5.

[0026] It is worth mentioning that the swing center of the detection probe 9 is the midpoint of the line connecting the center point between the two eccentric wheels 11 and the hinge point of the swing seat 7. The swing amplitude is adjusted by changing the distance between the micro-motion drive component and the swing seat 7 through the adjustment frame 10. When the distance increases, the swing amplitude decreases, and when the distance decreases, the swing amplitude increases.

[0027] Preferably, an arc-shaped groove 12 that fits the probe housing 8 is provided on the outer wall of the eccentric wheel 11, and an elastic abutment rib 13 is provided in the arc-shaped groove 12.

[0028] This invention, through the arc-shaped groove 12 and elastic abutment rib 13 formed on the outer wall of the eccentric wheel 11, can effectively enhance the contact force between the eccentric wheel 11 and the probe housing 8, maintain stable transmission performance, and reduce errors caused by friction or positional misalignment. This ensures precise fit between the probe housing 8 and the eccentric wheel 11, thereby enhancing stability during the micro-motion drive process.

[0029] The micro-motion drive assembly also includes a micro-motor 14, an eccentric shaft 15, and a synchronous belt 16. The micro-motor 14 is fixedly mounted on the adjustment frame 10. The two eccentric shafts 15 are respectively connected to the eccentric parts of the two eccentric wheels 11. Both eccentric shafts 15 are fixedly equipped with synchronous pulleys, and the two synchronous pulleys are synchronously driven through the synchronous belt 16.

[0030] The eccentric shaft 15 is driven to rotate by the micro motor 14, and the two eccentric wheels 11 are driven to rotate synchronously by the synchronous belt 16. This ensures that the two eccentric wheels 11 can always be in contact with the probe housing 8, thus ensuring the stability of the transmission. This structure can drive the probe housing 8 to drive the probe head (detection probe 9) to perform arc reciprocating swing, providing precise micro-motion control.

[0031] The micro-motion adjustment assembly includes a spacing adjustment electric cylinder 17 and a push rod 18. The spacing adjustment electric cylinder 17 is fixedly mounted on the drive frame 6. The two ends of the push rod 18 are fixedly connected to the spacing adjustment electric cylinder 17 and the adjustment frame 10, respectively. The adjustment frame 10 is slidably mounted on the drive frame 6 via a first slide groove 19. There are two first slide grooves 19 located on both sides of the push rod 18. The first slide grooves 19 are mounted on the drive frame 6. A damping micro-positioning bead 20 and multiple positioning recesses 21 are provided between the adjustment frame 10 and the first slide groove 19. The damping micro-positioning bead 20 is fixed on the adjustment frame 10. The multiple positioning recesses 21 are equidistantly arranged along the length direction of the first slide groove 19 and located at the bottom of the first slide groove 19. The damping micro-positioning bead 20 can be embedded into the corresponding positioning recesses 21 and achieve self-locking positioning without movement after the swing amplitude of the detection probe 9 is adjusted.

[0032] When it is necessary to adjust the swing amplitude of the detection probe 9, the micro-motion adjustment component drives the adjustment frame 10 to move relative to the drive frame 6, thereby changing the distance between the center point of the two eccentric wheels 11 and the hinge point of the swing seat 7, and thus changing the position of the swing center point between the two points on the probe housing 8, thereby changing the swing amplitude of the detection probe 9 located at one end of the probe housing 8. The distance adjustment electric cylinder 17 drives the push rod 18 to move, and the push rod 18 moves, causing the adjustment frame 10 to move, thereby causing the micro-motion drive component installed on the adjustment frame 10 to move synchronously. Through the cooperation of the damped micro-positioning bead 20 and the positioning recess 21, the self-locking function of the adjustment frame 10 after the swing amplitude is adjusted is realized, improving the overall stability during the micro-motion process.

[0033] Specifically, the swing seat 7 is provided with arc-shaped guide sliders 22 on both sides, and the drive frame 6 is provided with arc-shaped limiting grooves 23 that form a limiting sliding cooperation with the arc-shaped guide sliders 22.

[0034] The arc-shaped guide slider 22 and the arc-shaped limiting groove 23 work together to achieve precise amplitude limiting and directional guidance of the swing stroke of the swing seat 7, avoiding excessive swing that could cause overload, collision or detection distortion of the detection probe 9, ensuring the smoothness and directionality of the swing motion, and improving the reliability of the device operation.

[0035] In addition, the top of the swing seat 7 is provided with a pin hole 24, and the drive frame 6 is provided with an electromagnetic locking pin 25 corresponding to the pin hole 24.

[0036] By engaging the electromagnetic locking pin 25 with the pin hole 24, the swing seat 7 can be quickly locked and unlocked, allowing for flexible switching between pure radial linear detection and arc composite detection modes. The locking state is stable and reliable, and the mode switching is convenient and efficient, thus improving the detection compatibility of the device.

[0037] The swing seat 7 is covered and connected to the probe housing 8 by two adaptive follow-up guide springs 26. The adaptive follow-up guide springs 26 are fixedly connected to the swing seat 7, thereby realizing the fixed connection between the probe housing 8 and the swing seat 7.

[0038] The swing base 7 and the probe housing 8 are connected by an adaptive follow-up guide spring 26. The adaptive follow-up guide spring 26 is an integrally molded structure and is made of beryllium copper alloy. The adaptive follow-up guide spring 26 is divided into a fixed section installed on the swing base 7, an arc-shaped guide section that provides Z-axis floating, and a correction fitting section that supports the probe housing 8. The fixed end is connected to the swing base 7 to achieve horizontal synchronous swing. The arc-shaped guide section provides small-amplitude adaptive floating of the Z-axis. The correction fitting section applies a constant force to the probe housing 8 and performs correction action, thereby improving measurement accuracy and structural reliability. It realizes the functions of horizontal follow-up synchronization, Z-axis limited adaptive floating, and normal constant force correction of the probe housing 8.

[0039] The adaptive follow-up guide spring 26 enables the probe housing 8 to follow the horizontal movement of the swing seat 7. When the fixed end is locked on the swing seat 7 and drives the swing seat 7 to swing in an arc, the adaptive follow-up guide spring 26 swings synchronously as a whole, and the detection probe 9 has no lag or lateral movement in the horizontal direction. When there is a difference in the flatness of the brake disc surface, the adaptive follow-up guide spring 26 can drive the probe housing 8 to float adaptively in the Z-axis through the elastic force. Through the elastic deformation of the arc-shaped guide section, the detection probe 9 is allowed to float in the Z-direction to adapt to the flatness of the brake disc. Through the arc-shaped pre-tightening force of the correction and fitting section, the detection probe 9 is automatically pulled back to the vertical state after floating, always perpendicular to the brake disc plane, realizing the normal automatic return-to-center function.

[0040] The frame 1 is equipped with three circumferentially distributed measuring instrument drive mechanisms. The measuring instrument drive mechanisms are used to drive the probe housing 8 to move in both radial and axial directions along the brake disc, thereby realizing the detection drive and reset drive of the detection probe 9.

[0041] Specifically, the measuring instrument drive mechanism includes a support frame 27 and a mounting frame 31 fixedly mounted on the frame 1. The mounting frame 31 is equipped with a linear motion slide 29 for driving the support frame 27 to move radially along the brake disc. Two opposing lifting cylinders 30 are vertically fixed on the support frame 27, and the output ends of the lifting cylinders 30 are fixedly connected to the corresponding drive housing 5. The linear motion slide 29 controls the horizontal displacement of the probe housing 8, and the lifting cylinders 30 control the lifting displacement of the probe housing 8, thereby matching the testing requirements for different brake discs.

[0042] Preferably, an adjusting slide rail is vertically fixed on the support frame 27, and two matching sliders are provided on the adjusting slide rail. Each slider is fixed with a locking block, and each locking block has a guide post that slides through it. Both guide posts are fixed on the support frame 27, and each locking block is threaded with a tightening handle. The tightening handle can press against one side of the adjusting slide rail. The lifting cylinder 30 is fixed on the corresponding locking block, thereby adjusting the relative position of the two lifting cylinders 30 on the support frame 27.

[0043] The aforementioned linear sliding table 29 is existing technology. It mainly includes a sliding table that is driven to linear displacement by a lead screw and nut pair. Two parallel guide rails are slidably provided at the bottom of the sliding table. The guide rails are fixed on the mounting frame 31, and the support frame 27 is fixed on the sliding table. The details will not be elaborated further.

[0044] The present invention also provides a multi-probe method for measuring the roughness of the friction surface of a brake disc, comprising the following steps: S1: Workpiece positioning, assemble the brake disc into the tensioning and positioning assembly 3, complete the radial centering and tensioning of the brake disc, and rotate the drive assembly 2 to calibrate the brake disc to the initial circumferential position; S2: Radial probe feed, the measuring instrument drive mechanism drives the probe housing 8 to move, so that the probe housing 8 is close to the brake disc, the measuring drive assembly drives the drive frame 6 to move radially linearly along the brake disc, and drives the detection probe 9 to approach the friction surface measurement area of ​​the brake disc; S3: Measurement mode decoupling switch, by locking and unlocking the electromagnetic locking pin 25 and the swing seat 7, switch between pure radial linear displacement measurement mode or composite measurement mode of radial linear displacement and horizontal arc swing. S4: Swing amplitude preset control, the micro-motion adjustment component drives the adjustment frame 10 to slide along the drive frame 6, changing the relative distance between the adjustment frame 10 and the swing seat 7 to set the swing amplitude of the detection probe 9, and the swing amplitude is self-locked without slippage through the damped micro-positioning bead 20 and the positioning pit 21. S5: Six probes perform synchronous measurement. The six measurement units 4 are evenly distributed and work synchronously in a 120° circumferential direction. The detection probe 9 performs continuous radial linear displacement measurement along the friction surface of the brake disc. In the composite measurement mode, the eccentric wheel 11 drives the probe housing 8 to swing horizontally back and forth in the same phase. The adaptive follow-up guide spring 26 synchronously realizes the adaptive floating of the detection probe 9 along the Z-axis and the normal constant force correction. S6: Roughness data acquisition and acceptance judgment. Collect the surface morphology signal of each detection probe 9, extract the characteristic parameters, and take the maximum measurement value of each friction surface measurement area of ​​the brake disc to complete the acceptance judgment. S7: Probe avoids and resets. After the measurement is completed, the measuring instrument drive mechanism drives the probe housing 8 to reset, and the measuring drive component drives the drive frame 6 to reset radially, completing a single measurement process.

[0045] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A multi-probe measuring device for the roughness of a brake disc friction surface, comprising a frame (1), a rotary drive assembly (2) mounted at the center of the frame (1) for driving the brake disc to rotate about an axis, and a tensioning and positioning assembly (3) mounted on the rotary drive assembly (2) for radially positioning the brake disc, characterized in that, Also includes: The six measuring units (4) are divided into three groups that correspond one-to-one and are arranged in a circumferential distribution at 120° along the friction surface of the brake disc; The measuring unit (4) includes: Drive housing (5); The measuring drive assembly is disposed within the drive housing (5) and includes a drive frame (6) that is radially displaced along the brake disc. The swing seat (7) is hinged to the drive frame (6); The probe housing (8) is installed inside the drive housing (5) and fixedly connected to the swing seat (7). The probe housing (8) contains the detection probe (9). The adjustment frame (10) is slidably mounted on the drive frame (6); The micro-motion drive assembly is installed on the adjustment frame (10) and includes two eccentric wheels (11) that are synchronously arranged on both sides of the probe housing (8) and are in contact with the outer surface of the probe housing (8). The two eccentric wheels (11) are used to drive the probe housing (8) to drive the swing seat (7) to swing horizontally back and forth. The micro-adjustment assembly is mounted on the drive frame (6) and is used to change the distance between the adjustment frame (10) and the swing seat (7) to control the swing amplitude of the probe housing (8).

2. The multi-probe measuring device for brake disc friction surface roughness according to claim 1, characterized in that, An arc-shaped groove (12) is provided on the outer wall of the eccentric wheel (11) to fit the probe shell (8), and an elastic abutment rib (13) is provided in the arc-shaped groove (12).

3. The multi-probe measuring device for brake disc friction surface roughness according to claim 2, characterized in that, The micro-motion drive assembly also includes a micro-motor (14), an eccentric shaft (15), and a synchronous belt (16). The micro-motor (14) is fixedly mounted on the adjustment frame (10). The two eccentric shafts (15) are respectively connected to the eccentric parts of the two eccentric wheels (11). Both eccentric shafts (15) are fixed with synchronous pulleys that are synchronously driven by the synchronous belt (16).

4. The multi-probe measuring device for brake disc friction surface roughness according to claim 3, characterized in that, The micro-motion adjustment assembly includes a spacing adjustment electric cylinder (17) and a push rod (18). The spacing adjustment electric cylinder (17) is fixedly installed on the drive frame (6). The two ends of the push rod (18) are fixedly connected to the spacing adjustment electric cylinder (17) and the adjustment frame (10) respectively. The drive frame (6) is provided with first slide grooves (19) located on both sides of the push rod (18). The adjustment frame (10) is slidably connected in the two first slide grooves (19). The adjustment frame (10) is provided with damping micro-positioning beads (20) that match the first slide grooves (19). The bottom of the first slide groove (19) is provided with multiple positioning pits (21) at equal intervals along the length direction. The damping micro-positioning beads (20) are used to embed into the corresponding positioning pits (21) and realize the non-moving self-locking position after the swing amplitude of the detection probe (9) is adjusted.

5. The multi-probe measuring device for brake disc friction surface roughness according to claim 4, characterized in that, The swing seat (7) is provided with arc-shaped guide sliders (22) on both sides, and the drive frame (6) is provided with arc-shaped limiting grooves (23) corresponding to the arc-shaped guide sliders (22). The arc-shaped guide sliders (22) are limited and swing in the corresponding arc-shaped limiting grooves (23).

6. The multi-probe measuring device for brake disc friction surface roughness according to claim 5, characterized in that, The top of the swing seat (7) is provided with a pin hole (24), and the drive frame (6) is provided with an electromagnetic locking pin (25) corresponding to the pin hole (24).

7. The multi-probe measuring device for brake disc friction surface roughness according to claim 6, characterized in that, The swing seat (7) is covered and connected to the probe shell (8) by two adaptive follow-up guide springs (26), and the adaptive follow-up guide springs (26) are fixedly connected to the swing seat (7).

8. The multi-probe measuring device for brake disc friction surface roughness according to claim 7, characterized in that, The adaptive follow-up guide spring (26) is made of beryllium copper alloy. The adaptive follow-up guide spring (26) is divided into a fixed section installed on the swing seat (7), an arc-shaped guide section that provides Z-axis floating, and a correction and fitting section that supports the probe shell (8).

9. A multi-probe measuring device for brake disc friction surface roughness according to claim 8, characterized in that, The frame (1) is provided with three circumferentially distributed measuring instrument drive mechanisms. The measuring instrument drive mechanism includes a support frame (27) and a mounting frame (31) fixedly installed on the frame (1). The mounting frame (31) is provided with a linear moving slide (29) for driving the support frame (27) to move radially along the brake disc. The support frame (27) is fixedly provided with two lifting cylinders (30) in opposite directions in the vertical direction. The output end of the lifting cylinder (30) is fixedly connected to the corresponding drive housing (5).

10. A multi-probe method for measuring the roughness of a brake disc friction surface, characterized in that, Using the multi-probe measuring device for brake disc friction surface roughness as described in claim 9 includes the following steps: S1: Workpiece positioning, assemble the brake disc into the tensioning and positioning assembly (3), complete the radial centering and tensioning of the brake disc, and rotate the drive assembly (2) to calibrate the brake disc to the initial circumferential position; S2: Radial probe feed, the measuring instrument drive mechanism drives the probe housing (8) to move, so that the probe housing (8) is close to the brake disc, the measuring drive assembly drives the drive frame (6) to move radially and linearly along the brake disc, and drives the detection probe (9) to approach the friction surface measurement area of ​​the brake disc; S3: Measurement mode decoupling switch, by locking and unlocking the electromagnetic locking pin (25) and the swing seat (7), switch between pure radial linear displacement measurement mode or composite measurement mode of radial linear displacement and horizontal arc swing. S4: Preset control of swing amplitude. The micro-motion adjustment component drives the adjustment frame (10) to slide along the drive frame (6), changing the relative distance between the adjustment frame (10) and the swing seat (7) to set the swing amplitude of the detection probe (9). The swing amplitude is self-locked without movement by the damping micro-positioning bead (20) and the positioning pit (21). S5: Six probes perform synchronous measurement. The six measurement units (4) work synchronously with a 120° circumferential distribution. The detection probe (9) performs continuous radial linear displacement measurement along the friction surface of the brake disc. In the composite measurement mode, the eccentric wheel (11) drives the probe housing (8) to swing horizontally back and forth in the same phase. The adaptive follow-up guide spring (26) synchronously realizes the adaptive floating of the detection probe (9) along the Z-axis and the normal constant force correction. S6: Roughness data acquisition and qualification judgment, collect the surface morphology signal of each detection probe (9), extract the characteristic parameters, and take the maximum measurement value of each friction surface measurement area of ​​the brake disc to complete the qualification judgment; S7: Probe avoids reset. After the measurement is completed, the measuring instrument drive mechanism drives the probe housing (8) to reset, and the measuring drive component drives the drive frame (6) to reset radially, completing a single measurement process.

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