A dynamic balance testing apparatus and a testing method thereof

Abstract

The application discloses a kind of dynamic balance detection equipment, belong to hub detection technical field, including pedestal, the pedestal is fixedly connected with mounting seat, the mounting seat is arc, the both ends of the mounting seat are respectively equipped with hub positioning structure, hub is placed on the hub positioning structure, by the setting of multiple electronic micrometer, the bottom of the hub after installation positioning can be detected in advance, under the condition of carrying out pre-detection, multiple electronic micrometer is driven under the vertical screw rod to measure multiple point positions of the bottom of the hub, the ascending and descending height of multiple electronic micrometer is same, thus when multiple electronic micrometer rises simultaneously and measures by abutting the surface of the bottom of the hub, corresponding thousandth data can be directly obtained, and when the data of multiple electronic micrometer is not same, i.e. it is judged that the installation position of hub has deviated, to prevent the phenomenon that test error occurs due to installation deviation before balance measurement.

Description

Technical Field

[0001] This invention relates to the field of wheel hub testing technology, specifically to a dynamic balance testing device and its testing method. Background Technology

[0002] Entering the 21st century, with the deep integration of microprocessors, sensor technology, and digital signal processing algorithms, dynamic balancing equipment has entered an intelligent stage. The application of high-precision piezoelectric sensors, laser measurement technology, and CCD vision recognition systems enables the equipment to capture micron-level vibration signals. Combined with algorithms such as DFT parameter extraction, FIR filtering, and wavelet analysis, accurate calculation of the magnitude and phase of imbalance is achieved. Simultaneously, the penetration of IoT, cloud computing, and artificial intelligence technologies has driven the development of equipment towards intelligent networking, enabling remote monitoring, data analysis, predictive maintenance, and adaptive calibration, significantly improving production efficiency and equipment reliability.

[0003] In existing dynamic balancing testing equipment, especially for wheel hubs, most rely on high-precision sensors. However, current wheel hub dynamic balancing testing typically uses two hydraulic rods for positioning before rotational testing. During placement, if some hubs are not balanced or experience slight misalignment due to upper and lower pressure limits, an imbalance will inevitably occur during rotation. Furthermore, over prolonged use, the sensors may develop a certain degree of detection offset. Continuous detection offset can lead to persistently inaccurate dynamic balancing measurements. Additionally, existing probes lack sufficient flexibility in adjusting their position for different sizes and styles, such as star-shaped or two-piece wheel hubs, making it difficult to meet diverse measurement needs. Therefore, a dynamic balancing testing device is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a dynamic balance testing device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a dynamic balance testing device, comprising a base, a mounting seat fixedly connected to the base, the mounting seat being bow-shaped, a hub positioning structure being installed at both ends of the mounting seat, a hub being placed on the hub positioning structure, and a balance measuring structure being installed on the base; The balancing measurement structure includes a sleeve ring mounted on the base. A sliding crossbar is connected to the outside of the sleeve ring via a sliding structure. A sleeve housing is fitted over the outside of the sliding crossbar. A micro motor is fixedly connected to the outside of the sleeve housing. A vertical lead screw is mounted on the output shaft of the micro motor. A movable seat is threaded onto the outside of the vertical lead screw. An electronic dial indicator is fixedly connected to the outside of the movable seat via a connecting plate.

[0006] Preferably, a micro gear is mounted on the outside of the vertical lead screw via a magnetic positioning structure, and a toothed plate is fixedly connected to the outside of the moving crossbar, with the micro gear meshing with the toothed plate.

[0007] Preferably, a friction wheel is installed on the outside of the vertical lead screw via a magnetic positioning structure. The friction wheel is attached to the outside of the sleeve ring. An inner clamping plate is fixedly connected to the outside of the moving crossbar. An outer clamping plate is fixedly connected to the outside of the sleeve housing. The inner clamping plate is located inside the sleeve ring, and the outer clamping plate is located outside the sleeve ring.

[0008] Preferably, the micro gear has a second annular piezoelectric contact piece integrally formed on its exterior, the tooth plate has a second strip-shaped piezoelectric contact piece integrally formed at its center, the friction wheel has a first annular piezoelectric contact piece attached to its exterior, and the sleeve ring has a first strip-shaped piezoelectric contact piece fixedly connected to its exterior.

[0009] Preferably, the magnetic positioning structure includes multiple movable grooves formed inside the friction wheel and the micro gear. Elastic rubber is fixedly connected inside each movable groove. A snap-fit ​​ratchet plate is fixedly connected to the side of the elastic rubber away from the movable groove. Two snap-fit ​​ratchet wheels are integrally formed on the outside of the vertical lead screw, with one end of the ratchet wheel located at the center of the micro gear and the other end located at the center of the friction wheel. A vertical guide plate is fixedly connected to the outside of the sleeve housing. A sliding groove is formed on the outside of the vertical guide plate. A connecting plate is slidably connected inside the sliding groove. A snap-fit ​​battery is fixedly connected to the outside of the vertical guide plate. A conductive rod is installed on the outside of the snap-fit ​​battery. A rolling ball is installed on the end of the conductive rod away from the snap-fit ​​battery. A conductive ring is integrally formed on the outside of the vertical lead screw. The conductive ring is electrically connected to the two snap-fit ​​ratchet wheels via a wire, and the rolling ball is attached to the outside of the conductive ring.

[0010] Preferably, a sidewall omnidirectional ball is installed on the side adjacent to the inner and outer card plates.

[0011] Preferably, the sleeve ring is provided with a guide groove, and the bottom of the movable crossbar is fixedly connected with a top universal ball, which is located inside the guide groove.

[0012] Preferably, the hub positioning structure includes a toggle sleeve, which is fixedly connected to one end of the mounting base. A top pressure shaft is movably connected inside the toggle sleeve. A sleeve mounting sleeve is fixedly connected to the other end of the mounting base. A bearing shaft is rotatably connected to the center of the sleeve mounting sleeve, and a drive structure is installed at the bottom of the bearing shaft.

[0013] Preferably, the drive structure includes a drive motor, which is fixedly connected inside the base. The output shaft of the drive motor is equipped with a drive pulley, and the bottom of the bearing shaft is fixedly connected with a driven pulley. The drive pulley and the driven pulley are connected by a belt drive.

[0014] The present invention also provides a method for detecting dynamic balance, the method comprising the following steps: S1. Place the center hole of the hub to be tested onto the bearing shaft of the hub positioning structure, and operate the top pressure shaft to advance axially and abut against the end face of the hub, so as to achieve radial support and axial clamping and fixation of the hub in cooperation with the bearing shaft. S2. Based on the size and style of the wheel hub to be tested, the micro gear or friction wheel is fixed to the vertical lead screw through the magnetic positioning structure. The micro motor is started to drive the vertical lead screw to rotate, which drives the micro gear to move laterally along the tooth plate or the friction wheel to roll around the circumference of the sleeve ring. Simultaneously, the resistance value change generated by the contact and compression between the second annular piezoelectric contact piece and the second strip piezoelectric contact piece, and between the first annular piezoelectric contact piece and the first strip piezoelectric contact piece is measured and fed back in real time to the lateral and circumferential positions of the electronic micrometer. The electronic micrometer is accurately positioned to multiple radial and circumferential measurement points preset at the bottom of the wheel hub. S3. Start the micro motor to drive the vertical lead screw to rotate, drive the moving base to drive the electronic dial indicator to rise vertically, so that the electronic dial indicator comes into contact with each preset measurement point at the bottom of the wheel hub in sequence, and collect and record the distance measurement values ​​of each point. S4. Based on the values ​​of multiple measurement points collected in step S3, a total of multiple sets of test results are obtained, including: determining the overall parallelism of the bottom of the wheel hub by the height difference of the values ​​at each point, and determining whether there is any tilt or offset in the installation of the wheel hub; determining the local unevenness of the bottom of the wheel hub by the size distribution and abrupt changes of the values ​​at each point, and identifying abnormal protrusions or depressions at the structural feature positions of the wheel hub; and determining the uniformity of the thickness of the wheel hub blank by the overall consistency of the values ​​at each point, so as to eliminate the initial processing error for subsequent rotational dynamic balancing test. S5. If step S4 determines that the wheel hub installation is not tilted and the blank processing has no obvious error, start the drive structure to drive the bearing shaft and wheel hub to rotate synchronously. The electronic sensor detects the rotation offset. After the electronic sensor completes the detection, the electronic dial indicator detects the runout during the wheel hub rotation process to complete the wheel hub dynamic balance test.

[0015] Compared with the prior art, the beneficial effects of the present invention are: In this invention, by setting up multiple electronic dial indicators, the bottom of the wheel hub after installation and positioning can be pre-tested. During the pre-test, the multiple electronic dial indicators measure multiple points on the bottom of the wheel hub under the drive of the vertical lead screw. During the measurement process, the multiple electronic dial indicators rise and fall at the same height. Therefore, when multiple electronic dial indicators rise simultaneously to touch the bottom surface of the wheel hub for measurement, the corresponding micrometer data will be obtained directly. When the data of multiple electronic dial indicators are not the same, it is determined that the installation position of the wheel hub has been offset. This prevents the wheel hub from being offset before the balance measurement, which would lead to test errors. Attached Figure Description

[0016] Figure 1 This is one of the three-dimensional structural schematic diagrams of an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of the base in an embodiment of the present invention; Figure 3 This is a second three-dimensional structural schematic diagram of an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the sleeve ring and the first strip piezoelectric contact piece in an embodiment of the present invention; Figure 5 This is a schematic diagram of the separated and combined state structure of the sleeve housing and the movable crossbar in an embodiment of the present invention; Figure 6 This is a partial side view of the movable crossbar in an embodiment of the present invention; Figure 7 This is an embodiment of the present invention. Figure 6 A magnified structural diagram of area A in the diagram; Figure 8 This is a top view cross-sectional structural diagram of the friction-driven wheel in an embodiment of the present invention.

[0017] In the diagram: 100, base; 101, drive motor; 102, drive pulley; 103, mounting sleeve; 104, driven pulley; 105, bearing shaft; 106, mounting base; 107, actuating sleeve; 108, pressure shaft; 109, vertical guide plate; 110, connecting ring; 111, connecting housing; 112, moving crossbar; 113, micro motor; 114, vertical lead screw; 115, moving base; 116, connecting plate; 117, electronic dial indicator; 200, micro gear. ; 201, Toothed plate; 300, Friction wheel; 301, Inner clamping plate; 302, Outer clamping plate; 400, Moving groove; 401, Elastic rubber; 402, Clamping ratchet plate; 403, Clamping ratchet wheel; 404, Conductive ring; 405, Conductive rod; 406, Clamping battery; 500, First annular piezoelectric contact piece; 501, First strip piezoelectric contact piece; 600, Second annular piezoelectric contact piece; 601, Second strip piezoelectric contact piece; 700, Side wall universal ball; 800, Top universal ball. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1, such as Figures 1-3 As shown, this application discloses a dynamic balance testing device, including a base 100, a mounting seat 106 fixedly connected to the base 100, the mounting seat 106 being bow-shaped, a hub positioning structure being installed at both ends of the mounting seat 106, the hub being placed on the hub positioning structure, and a balance measurement structure being installed on the base 100. The balance measurement structure includes a sleeve ring 110, which is mounted on the base 100. A sliding crossbar 112 is connected to the outside of the sleeve ring 110 via a sliding structure. A sleeve housing 111 is sleeved on the outside of the sliding crossbar 112. A micro motor 113 is fixedly connected to the outside of the sleeve housing 111. A vertical lead screw 114 is mounted on the output shaft of the micro motor 113. A movable seat 115 is threadedly connected to the outside of the vertical lead screw 114. An electronic dial indicator 117 is fixedly connected to the outside of the movable seat 115 via a connecting plate 116.

[0020] Specifically, during use, the base 100 serves as the overall load-bearing foundation, and the arched mounting base 106 provides space and support for the placement of the wheel hub. First, the wheel hub to be tested is placed on the wheel hub positioning structures at both ends of the mounting base 106 for fixation. Then, the balancing measurement structure on the base 100 is activated to perform the testing operation. The sleeve ring 110 in the balancing measurement structure provides the mounting and movement foundation for the moving crossbar 112. The moving crossbar 112 can be adjusted in position through the sliding structure between it and the sleeve ring 110. The sleeve housing 111 is fitted onto the outside of the moving crossbar 112 and can slide laterally along it. When the testing operation is started, the micro-electric current on the outside of the sleeve housing 111... When the machine 113 is powered on, its output shaft drives the vertical lead screw 114 to rotate synchronously. The movable seat 115, which is threadedly connected to the vertical lead screw 114, moves vertically up and down under the action of the lead screw rotation. Then, through the connecting plate 116 connected to the movable seat 115, the electronic dial indicator 117 moves up and down synchronously, so that the electronic dial indicator 117 can accurately fit the detection position at the bottom of the wheel hub. The detection feedback of the electronic dial indicator 117 realizes the collection of dynamic balance data related to the wheel hub. At the same time, it can be coordinated with the sliding of the movable crossbar 112 and the lateral movement of the sleeve housing 111 to adjust the detection point of the electronic dial indicator 117, so as to complete the dynamic balance detection of different positions of the wheel hub.

[0021] like Figure 3 As shown, the hub positioning structure includes a toggle sleeve 107, which is fixedly connected to one end of the mounting base 106. A top pressure shaft 108 is movably connected inside the toggle sleeve 107. A sleeve mounting sleeve 103 is fixedly connected to the other end of the mounting base 106. A bearing shaft 105 is rotatably connected at the center of the sleeve mounting sleeve 103. A drive structure is installed at the bottom of the bearing shaft 105.

[0022] Specifically, during hub positioning, the center hole of the hub to be tested is first fitted onto the bearing shaft 105. The bearing shaft 105 provides radial support and positioning for the hub. Then, the top pressure shaft 108 inside the push sleeve 107 at one end of the mounting base 106 is pressed down, causing the top pressure shaft 108 to move axially inside the push sleeve 107 and move towards the hub until the top pressure shaft 108 abuts against the end face of the hub away from the bearing shaft 105. This, together with the bearing shaft 105, achieves axial clamping and fixing of the hub, ensuring that the hub will not shift or wobble during the testing process. The drive structure installed at the bottom of the bearing shaft 105 inside the sleeve mounting sleeve 103 provides power after the hub positioning is completed, driving the bearing shaft 105 to rotate around its own axis, thereby pulling the positioned and clamped hub to rotate synchronously, providing a stable rotational motion basis for subsequent dynamic balancing testing.

[0023] like Figure 2As shown, the drive structure includes a drive motor 101, which is fixedly connected inside the base 100. The output shaft of the drive motor 101 is equipped with a drive pulley 102, and the bottom of the bearing shaft 105 is fixedly connected with a driven pulley 104. The drive pulley 102 and the driven pulley 104 are connected by a belt drive.

[0024] Specifically, after the hub is positioned, the drive motor 101 fixed inside the base 100 is powered on and started. Its output shaft drives the coaxially mounted drive pulley 102 to rotate synchronously. Through the belt drive connection between the drive pulley 102 and the driven pulley 104, the power and rotational motion output by the drive motor 101 are transmitted to the driven pulley 104, which in turn drives the bearing shaft 105 fixed to the driven pulley 104 to rotate. This causes the hub, which is positioned and clamped on the bearing shaft 105, to rotate synchronously, providing stable and controllable rotational power for the dynamic balance test of the hub.

[0025] The technical solutions described in the above embodiments of this application have at least the following technical effects or advantages: Compared with the prior art, in this embodiment, by setting multiple electronic dial gauges 117, the bottom of the wheel hub after installation and positioning can be pre-tested. During the pre-test, multiple electronic dial gauges 117 measure multiple points on the bottom of the wheel hub under the drive of the vertical lead screw 114. During the measurement process, the rising and falling heights of multiple electronic dial gauges 117 are the same. Therefore, when multiple electronic dial gauges 117 rise simultaneously to abut against the bottom surface of the wheel hub for measurement, the corresponding micrometer data will be directly obtained. When the data of multiple electronic dial gauges 117 are not the same, it is determined that the installation position of the wheel hub has shifted, thereby preventing the phenomenon of installation shift of the wheel hub before the balance measurement, which would lead to test errors.

[0026] Example 2: Considering that the measurement positions for different wheel hubs differ during bottom tilt measurement after wheel hub installation and fixation (e.g., 19-inch and 20-inch wheel hubs), and that multiple electronic dial indicators 117 need to measure different points when facing wheel hubs of different sizes, this application proposes the following technical solution to address the aforementioned technical problems: like Figures 3-8 As shown, a micro gear 200 is installed on the outside of the vertical lead screw 114 through a magnetic positioning structure, and a toothed plate 201 is fixedly connected to the outside of the moving crossbar 112. The micro gear 200 and the toothed plate 201 are meshed together.

[0027] Specifically, during use, when the operator changes the hub of different gears for testing, the operator needs to adjust the position of multiple electronic dial indicators 117 on the moving crossbar 112. At this time, the micro gear 200 is stably positioned outside the vertical lead screw 114 by a magnetic positioning structure, so that the micro gear 200 can rotate synchronously with the vertical lead screw 114, and the micro gear 200 maintains a meshing state with the toothed plate 201 fixed outside the moving crossbar 112. When the micro motor 113 drives the vertical lead screw 114 to rotate, the vertical lead screw 114 drives the micro... The micro gear 200 rotates together with the gear plate 201. Under the meshing action of the micro gear 200 and the gear plate 201, the rotational motion of the micro gear 200 is converted into linear movement along the length of the gear plate 201. This drives the vertical lead screw 114, the sleeve housing 111 and the connected electronic dial indicator 117 to achieve precise lateral position adjustment along the moving crossbar 112. This adapts to the radial detection point requirements of hubs with different diameters. The magnetic positioning structure also ensures the stability of the connection between the micro gear 200 and the vertical lead screw 114, ensuring smooth power transmission and accurate position adjustment.

[0028] Furthermore, after the electronic dial indicator 117 is moved to the designated position, the connection between the micro gear 200 and the vertical lead screw 114 can be loosened through the magnetic positioning structure. After loosening, the micro motor 113 is restarted to drive the vertical lead screw 114 to rotate, thereby readjusting the position of the moving seat 115 and the electronic dial indicator 117 so that its measurement position is zero, thus enabling the detection of different positions of the wheel hub.

[0029] Considering that there are wheel hubs with different gears and different styles of wheel hubs, such as scalloped wheel hubs or two-piece wheel hubs, the measurement points for these wheel hubs are not only different at the front and rear, but also at different points on the circumference. To address the aforementioned technical problems, this application proposes the following technical solution: like Figures 3-8 As shown, a friction wheel 300 is installed on the outside of the vertical lead screw 114 via a magnetic positioning structure. The friction wheel 300 is attached to the outside of the sleeve ring 110. An inner clamping plate 301 is fixedly connected to the outside of the moving crossbar 112. An outer clamping plate 302 is fixedly connected to the outside of the sleeve housing 111. The inner clamping plate 301 is located inside the sleeve ring 110, and the outer clamping plate 302 is located outside the sleeve ring 110.

[0030] Specifically, during use, the micro motor 113 is first activated to drive the vertical lead screw 114, moving the moving seat 115 to its lowest position. After the movement is completed, the magnetic positioning structure inside the friction wheel 300 is activated. At this time, the magnetic positioning structure can stably position the friction wheel 300 outside the vertical lead screw 114, allowing the friction wheel 300 to rotate synchronously with the vertical lead screw 114. The outer edge of the friction wheel 300 is tightly fitted with the outer edge of the sleeve ring 110. At the same time, the inner locking plate 301 on the moving crossbar 112 and the outer locking plate 302 on the sleeve housing 111 are respectively locked onto the sleeve ring 110. The inner and outer sides of 10 form a clamping limit on the sleeve ring 110, preventing the friction wheel 300 from disengaging from the sleeve ring 110. When the micro motor 113 drives the vertical lead screw 114 to rotate, the vertical lead screw 114 drives the friction wheel 300 to rotate synchronously. Under the action of friction, the rotational motion of the friction wheel 300 is converted into rolling motion along the outer circumference of the sleeve ring 110, which in turn drives the vertical lead screw 114, the sleeve housing 111, the moving crossbar 112 and the connected electronic dial indicator 117 to adjust the circumferential position around the sleeve ring 110, thereby adapting to the needs of different circumferential detection points of the irregular wheel hub.

[0031] Furthermore, in use, a magnetic positioning structure can be installed inside the movable seat 115 to prevent the movable seat 115 from causing excessive movement of the electronic dial indicator 117 during the rotation of the vertical lead screw 114.

[0032] like Figures 4-8 As shown, the magnetic positioning structure includes multiple movable grooves 400 formed inside the friction wheel 300 and the micro gear 200. An elastic rubber 401 is fixedly connected inside each movable groove 400. A snap-fit ​​ratchet plate 402 is fixedly connected to the side of the elastic rubber 401 away from the movable groove 400. Two snap-fit ​​ratchet wheels 403 are integrally formed on the outside of the vertical lead screw 114. One end of the snap-fit ​​ratchet wheel 403 is located at the center of the micro gear 200, and the other end is located at the center of the friction wheel 300. The outer surface of the housing 111 is fitted with the ratchet wheel. A vertical guide plate 109 is fixedly connected, and a groove is provided on the outside of the vertical guide plate 109. A connecting plate 116 is slidably connected to the inside of the groove. A snap-fit ​​battery 406 is fixedly connected to the outside of the vertical guide plate 109. A conductive rod 405 is installed on the outside of the snap-fit ​​battery 406. A rolling ball is installed on the end of the conductive rod 405 away from the snap-fit ​​battery 406. A conductive ring 404 is integrally formed on the outside of the vertical lead screw 114. The conductive ring 404 is electrically connected to two snap-fit ​​ratchet 403s through wires. The rolling ball is attached to the outside of the conductive ring 404.

[0033] Specifically, the snap-fit ​​battery 406 powers the entire structure. The rolling ball at the end of its external conductive rod 405 always adheres to the conductive ring 404 outside the vertical lead screw 114, achieving a stable electrical connection during rotation. Current is transmitted through the conductive ring 404 and wires to the two snap-fit ​​ratchet 403 segments on the vertical lead screw 114. When the micro gear 200 needs to be activated, the snap-fit ​​ratchet 403 at the center of the micro gear 200 is energized, generating a magnetic attraction. This attracts the snap-fit ​​ratchet plate 402 connected to the elastic rubber 401 in the internal moving groove 400 of the micro gear 200 to move towards and engage with the snap-fit ​​ratchet 403, thus fixing the micro gear 200 to the vertical lead screw 114 so they can rotate synchronously. At this time, the snap-fit ​​ratchet 403 at the center of the friction wheel 300 is de-energized, the magnetic attraction disappears, and the friction wheel... The ratchet plate 402 inside the walking wheel 300 is reset under the elastic force of the elastic rubber 401 and separates from the corresponding ratchet 403. The friction walking wheel 300 is disconnected from the vertical screw 114. When the friction walking wheel 300 needs to be activated, the on / off states of the two ratchet 403 are reversed. The friction walking wheel 300 is locked to the vertical screw 114 by the ratchet plate 402 and the ratchet 403. The micro gear 200 is disconnected. At the same time, the groove on the vertical guide plate 109 forms a sliding guide for the connecting plate 116, restricting the connecting plate 116 and the connected moving seat 115 and electronic dial indicator 117 to only move vertically, preventing them from rotating synchronously with the vertical screw 114, and ensuring the detection stability of the electronic dial indicator 117.

[0034] The technical solutions in the above-described embodiments of this application have at least the following technical effects or advantages: Compared with Embodiment 1, in this embodiment, the magnetic positioning structure, in conjunction with the meshing connection between the micro gear 200 and the toothed plate 201, enables precise automatic adjustment of the transverse position of the electronic micrometer 117 along the moving crossbar 112. It can flexibly adjust the radial measurement points according to the detection requirements of different diameter wheel hubs such as 19-inch and 20-inch, solving the problem of poor adaptability of the detection probe position adjustment and inability to accurately correspond to the measurement points of different sized wheel hubs in the prior art. Furthermore, through the cooperation of the magnetic positioning structure with the friction walking wheel 300, the inner clamping plate 301 and the outer clamping plate 302, the circumferential position adjustment of the electronic micrometer 117 around the sleeve ring 110 can be realized, which can adapt to the measurement requirements of different circumferential detection points of irregular wheel hubs such as plum blossom wheel hubs and double-piece wheel hubs, expanding the detection range during wheel hub detection.

[0035] Example 3: Considering that the position of the electronic micrometer 117 needs to be determined in real time during the measurement process, and that the electronic micrometer 117 will move to different positions when the micro gear 200 and the friction wheel 300 rotate, and that the electronic micrometer 117 needs to measure different points and directions when moving and measuring different wheel hubs, this application proposes the following technical solution to solve the above technical problems, specifically: like Figures 3-7 As shown, the micro gear 200 has a second annular piezoelectric contact 600 integrally formed on its exterior, the tooth plate 201 has a second strip piezoelectric contact 601 integrally formed at its center, the friction wheel 300 has a first annular piezoelectric contact 500 attached to its exterior, and the sleeve ring 110 has a first strip piezoelectric contact 501 fixedly connected to its exterior.

[0036] Specifically, during use, when the micro gear 200 rotates with the vertical lead screw 114 and moves laterally along the toothed plate 201, its integrally formed second annular piezoelectric contact 600 periodically contacts and presses against the second strip-shaped piezoelectric contact 601 on the toothed plate 201. The resistance of the piezoelectric material changes accordingly under pressure. By detecting this change in resistance, the control system can accurately calculate the rolling distance of the micro gear 200, thereby obtaining the precise lateral movement position of the electronic micrometer 117. When the friction wheel 300 rotates with the vertical lead screw 114 and rolls along the circumference of the sleeve ring 110... The first annular piezoelectric contact 500 attached to the outside of the sleeve ring 110 is in continuous contact with the first strip piezoelectric contact 501 and is subjected to pressure. The resistance value of the piezoelectric contact changes regularly with the rolling angle of the friction wheel 300. By detecting this resistance change, the control system can accurately calculate the rotation angle of the friction wheel 300, and then calculate the precise circumferential movement position of the electronic micrometer 117. Through the coordinated work of the two sets of piezoelectric contact pieces, the precise measurement and feedback of the lateral and circumferential movement position of the electronic micrometer 117 is achieved, providing data support for the precise positioning of the wheel hub detection point.

[0037] Furthermore, in specific testing processes, for example, taking the pre-testing of the bottom tilt and dynamic balance of a 20-inch plum blossom wheel hub as an example, the equipment first switches to the lateral adjustment mode. The micro gear 200 drives the electronic micrometer 117 to move laterally along the toothed plate 201. The resistance change of the second annular piezoelectric contact 600 and the second strip piezoelectric contact 601 is fed back and displayed. The electronic micrometer 117 moves precisely to the two measuring positions R150mm and R180mm radially of the wheel hub in sequence. Then, it switches to the circumferential adjustment mode. The friction wheel 300 drives the electronic micrometer 117 to move circumferentially along the sleeve ring 110. The resistance change of the first annular piezoelectric contact 500 and the first strip piezoelectric contact 501 is fed back and displayed. The micrometer 117 accurately positioned the 20-inch 270-inch plum blossom wheel at four circumferential positions (0°, 90°, 180°, and 270°) at each radial position. It measured the bottom distance at eight points, yielding the following values: R150mm-0° 28.002mm, R150mm-90° 28.005mm, R150mm-180° 28.001mm, R150mm-270° 28.006mm, R180mm-0° 28.003mm, R180mm-90° 28.006mm, R180mm-180° 28.002mm, and R180mm-270° 28.007mm.

[0038] These values ​​can be used to comprehensively detect multiple results: First, the overall parallelism of the bottom of the wheel hub. The maximum difference between the values ​​of the various measurement points of the wheel hub is 0.006mm, which is within the acceptable tolerance range of ±0.008mm. It is determined that the wheel hub is placed without tilting and the parallelism is qualified. Secondly, there is a local unevenness deviation in the wheel hub. The value of the number of points in the R180mm-270° range is 28.007mm, which is the maximum value of all points. Combined with the structural design of the plum blossom wheel hub, it can be determined that this point corresponds to the position of the reinforcing rib at the bottom of the wheel hub, and there is no abnormal protrusion. Third, the pre-test data for dynamic balancing showed no abrupt deviations in the values ​​at each point, indicating that there was no significant unevenness in the thickness of the wheel hub blank. This eliminated the dual initial errors of blank processing and placement tilt for subsequent rotational dynamic balancing testing. At the same time, the deviation between the position data fed back by the piezoelectric contact and the preset measurement position was ≤0.002mm, verifying the accuracy of the electronic micrometer 117 positioning and ensuring the validity of the measurement data.

[0039] The present invention also provides a method for detecting dynamic balance, the method comprising the following steps: S1. Place the center hole of the hub to be tested onto the bearing shaft 105 of the hub positioning structure, and operate the top pressure shaft 108 to push it axially and abut against the end face of the hub, so as to achieve radial support and axial clamping and fixation of the hub in cooperation with the bearing shaft 105. S2. Based on the size and style of the wheel hub to be tested, the micro gear 200 or friction wheel 300 is fixed to the vertical lead screw 114 through the magnetic positioning structure. The micro motor 113 is started to drive the vertical lead screw 114 to rotate, driving the micro gear 200 to move laterally along the tooth plate 201 or the friction wheel 300 to roll circumferentially along the sleeve ring 110. Simultaneously, the resistance value change generated by the contact and compression between the second annular piezoelectric contact piece 600 and the second strip piezoelectric contact piece 601, and the first annular piezoelectric contact piece 500 and the first strip piezoelectric contact piece 501 is measured and fed back in real time to the lateral and circumferential positions of the electronic micrometer 117, and the electronic micrometer 117 is accurately positioned to multiple radial and circumferential measurement points preset at the bottom of the wheel hub. S3. Start the micro motor 113 to drive the vertical lead screw 114 to rotate, drive the moving seat 115 to drive the electronic dial indicator 117 to rise vertically, so that the electronic dial indicator 117 comes into contact with each preset measurement point at the bottom of the wheel hub in sequence, and collect and record the distance measurement values ​​of each point. S4. Based on the values ​​of multiple measurement points collected in step S3, a total of multiple sets of test results are obtained, including: determining the overall parallelism of the bottom of the wheel hub by the height difference of the values ​​at each point, and determining whether there is any tilt or offset in the installation of the wheel hub; determining the local unevenness of the bottom of the wheel hub by the size distribution and abrupt changes of the values ​​at each point, and identifying abnormal protrusions or depressions at the structural feature positions of the wheel hub; and determining the uniformity of the thickness of the wheel hub blank by the overall consistency of the values ​​at each point, so as to eliminate the initial processing error for subsequent rotational dynamic balancing test. S5. If step S4 determines that the wheel hub installation is not tilted and the blank processing has no obvious error, start the drive structure to drive the bearing shaft 105 and the wheel hub to rotate synchronously. The electronic sensor detects the rotation offset. After the electronic sensor completes the detection, the electronic dial indicator 117 detects the runout during the wheel hub rotation process to complete the wheel hub dynamic balance test.

[0040] like Figures 5-6 As shown, a guide groove 801 is provided on the sleeve ring 110, and a top universal ball 800 is fixedly connected to the bottom of the moving crossbar 112. The top universal ball 800 is located inside the guide groove 801, and a side wall universal ball 700 is installed on the side adjacent to the inner side plate 301 and the outer side plate 302.

[0041] Specifically, when the moving crossbar 112 moves in a circular motion around the sleeve ring 110 with the rolling of the friction wheel 300, the top universal ball 800 at the bottom of the moving crossbar 112 is always engaged inside the guide groove 801 opened on the sleeve ring 110 and rolls along the groove wall. The guide groove 801 provides trajectory constraints for the movement of the top universal ball 800, thereby forming a limiting guide for the circular motion of the moving crossbar 112, restricting the radial sway, shaking or displacement of the moving crossbar 112 during the movement. At the same time, the top universal ball 800 converts the sliding friction between the moving crossbar 112 and the sleeve ring 110 into rolling friction, reducing the motion resistance between the two, and ensuring the smoothness and stability of the moving crossbar 112 driving the electronic dial indicator 117 to move in a circular motion along the sleeve ring 110. At the same time, through the inner clamping plate 301 and The outer clamping plates 302 abut against the inner and outer sides of the sleeve ring 110 respectively to form clamping limits. The side wall universal ball 700 installed on the adjacent side directly contacts the side wall of the sleeve ring 110. The side wall universal ball 700 rolls along the side wall of the sleeve ring 110 as the clamping plate moves, converting the sliding friction between the clamping plate and the sleeve ring 110 into rolling friction. This reduces the motion friction resistance between the clamping plate and the sleeve ring 110, reduces component wear, and makes the overall circumferential movement smoother. At the same time, the rolling contact of the side wall universal ball 700 also allows the clamping plate to maintain a stable clamping distance with the sleeve ring 110, avoiding jamming and offset problems caused by direct hard contact between the clamping plate and the sleeve ring 110. This makes the circumferential position adjustment of the electronic micrometer 117 more precise and avoids the impact of structural shaking on the positioning accuracy of the detection point and the accuracy of the detection data.

[0042] The technical solutions in the above-described embodiments of this application have at least the following technical effects or advantages: Compared with Embodiment 2, in this embodiment, through the cooperation of two sets of piezoelectric structures, namely the first annular piezoelectric contact piece 500, the first strip piezoelectric contact piece 501, the second annular piezoelectric contact piece 600, and the second strip piezoelectric contact piece 601, a precise real-time measurement feedback is formed for the position positioning requirements of the electronic micrometer 117 in both lateral and circumferential dimensions. At the same time, the movement and position measurement of the electronic micrometer 117 are synchronized, realizing the real-time determination of the position during the movement. When performing the test, the position of the electronic micrometer 117 can be grasped at any time, accurately matching the measurement requirements of different sizes and styles of wheel hubs.

[0043] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dynamic balance testing device, comprising a base (100), characterized in that: A mounting base (106) is fixedly connected to the base (100). The mounting base (106) is bow-shaped. A hub positioning structure is installed at both ends of the mounting base (106). The hub is placed on the hub positioning structure. A balance measuring structure is installed on the base (100). The balance measurement structure includes a sleeve ring (110), which is mounted on the base (100). A sliding crossbar (112) is connected to the outside of the sleeve ring (110) through a sliding structure. A sleeve housing (111) is sleeved on the outside of the sliding crossbar (112). A micro motor (113) is fixedly connected to the outside of the sleeve housing (111). A vertical lead screw (114) is mounted on the output shaft of the micro motor (113). A moving seat (115) is threaded to the outside of the vertical lead screw (114). An electronic dial indicator (117) is fixedly connected to the outside of the moving seat (115) through a connecting plate (116). The vertical lead screw (114) is fitted with a micro gear (200) via a magnetic positioning structure. The movable crossbar (112) is fixedly connected to a toothed plate (201). The micro gear (200) meshes with the toothed plate (201). The vertical lead screw (114) is fitted with a friction wheel (300) via a magnetic positioning structure. The friction wheel (300) is attached to the outside of the sleeve ring (110). The movable crossbar (112) is fixedly connected to an inner plate (301). The sleeve housing (111) is fixedly connected to an outer plate (302). The inner plate (301) is located inside the sleeve ring (110), and the outer plate (302) is located outside the sleeve ring (110). The micro gear (200) has a second annular piezoelectric contact piece (600) integrally formed on its exterior, the tooth plate (201) has a second strip piezoelectric contact piece (601) integrally formed at its center, the friction wheel (300) has a first annular piezoelectric contact piece (500) attached to its exterior, and the sleeve ring (110) has a first strip piezoelectric contact piece (501) fixedly connected to its exterior.

2. The dynamic balance testing device according to claim 1, characterized in that: The magnetic positioning structure includes multiple movable slots (400) formed inside the friction wheel (300) and the micro gear (200). An elastic rubber (401) is fixedly connected inside each movable slot (400). A snap-fit ​​ratchet plate (402) is fixedly connected to the side of the elastic rubber (401) away from the movable slot (400). The vertical lead screw (114) has two snap-fit ​​ratchet wheels (403) integrally formed on its exterior. One end of the snap-fit ​​ratchet wheel (403) is located at the center of the micro gear (200), and the other end is located at the center of the friction wheel (300). The outer surface of the sleeve housing (111) is fixedly... A vertical guide plate (109) is fixedly connected to the vertical guide plate (109), and a groove is provided on the outside of the vertical guide plate (109). The connecting plate (116) is slidably connected to the inside of the groove. A snap-fit ​​battery (406) is fixedly connected to the outside of the vertical guide plate (109). A conductive rod (405) is installed on the outside of the snap-fit ​​battery (406). A rolling ball is installed on the end of the conductive rod (405) away from the snap-fit ​​battery (406). A conductive ring (404) is integrally formed on the outside of the vertical lead screw (114). The conductive ring (404) is electrically connected to two snap-fit ​​ratchet wheels (403) through a wire. The rolling ball is attached to the outside of the conductive ring (404).

3. The dynamic balance testing device according to claim 2, characterized in that: A sidewall omnidirectional ball (700) is installed on the side adjacent to the inner side plate (301) and the outer side plate (302).

4. The dynamic balance testing device according to claim 1, characterized in that: The sleeve ring (110) is provided with a guide groove (801), and the bottom of the moving crossbar (112) is fixedly connected with a top universal ball (800), which is located inside the guide groove (801).

5. The dynamic balance testing device according to claim 1, characterized in that: The hub positioning structure includes a toggle sleeve (107), which is fixedly connected to one end of the mounting base (106). A top pressure shaft (108) is movably connected inside the toggle sleeve (107). A sleeve mounting sleeve (103) is fixedly connected to the other end of the mounting base (106). A bearing shaft (105) is rotatably connected at the center of the sleeve mounting sleeve (103). A drive structure is installed at the bottom of the bearing shaft (105).

6. The dynamic balance testing device according to claim 5, characterized in that: The drive structure includes a drive motor (101), which is fixedly connected inside the base (100). The output shaft of the drive motor (101) is equipped with a drive pulley (102), and the bottom of the bearing shaft (105) is fixedly connected with a driven pulley (104). The drive pulley (102) and the driven pulley (104) are connected by belt drive.

7. A method for detecting dynamic balance, using a dynamic balance detection device as described in any one of claims 1-6, characterized in that, The method includes the following steps: S1. Place the center hole of the hub to be tested onto the bearing shaft (105) of the hub positioning structure, and operate the top pressure shaft (108) to push it along the axis and abut against the end face of the hub. The bearing shaft (105) is used to achieve radial support and axial clamping fixation of the hub. S2. According to the size and style of the wheel hub to be tested, the micro gear (200) or friction wheel (300) is fixed to the vertical screw (114) by the magnetic positioning structure. The micro motor (113) is started to drive the vertical screw (114) to rotate, and the micro gear (200) moves laterally along the tooth plate (201) or the friction wheel (300) rolls circumferentially along the sleeve ring (110). Simultaneously, the resistance value changes generated by the contact and compression of the second annular piezoelectric contact piece (600) and the second strip piezoelectric contact piece (601), and the first annular piezoelectric contact piece (500) and the first strip piezoelectric contact piece (501) are measured and fed back in real time. The electronic micrometer (117) is accurately positioned to multiple radial and circumferential measurement points preset at the bottom of the wheel hub. S3. Start the micro motor (113) to drive the vertical lead screw (114) to rotate, drive the moving seat (115) to drive the electronic dial indicator (117) to rise vertically, so that the electronic dial indicator (117) comes into contact with each preset measurement point at the bottom of the hub in sequence, and collect and record the distance measurement values ​​of each point. S4. Based on the values ​​of multiple measurement points collected in step S3, a total of multiple sets of test results are obtained, including: determining the overall parallelism of the bottom of the wheel hub by the height difference of the values ​​at each point, and determining whether there is any tilt or offset in the installation of the wheel hub; determining the local unevenness of the bottom of the wheel hub by the size distribution and abrupt changes of the values ​​at each point, and identifying abnormal protrusions or depressions at the structural feature positions of the wheel hub; and determining the uniformity of the thickness of the wheel hub blank by the overall consistency of the values ​​at each point, so as to eliminate the initial processing error for subsequent rotational dynamic balancing test. S5. If step S4 determines that the wheel hub installation is not tilted and the blank processing has no obvious error, start the drive structure to drive the bearing shaft (105) and the wheel hub to rotate synchronously. The electronic sensor detects the rotation offset. After the electronic sensor completes the detection, the electronic dial indicator (117) detects the runout during the wheel hub rotation process to complete the wheel hub dynamic balance test.

Images