Quality detection device and method for product rotation structure

Abstract

The present application relates to mechanical transmission and quality detection technical field, specifically for product rotary structure quality detection device and method, including for containing power module and transmission mechanism shell, power module generates power through transmission mechanism output direction opposite and at least two groups of rotary motion which are synchronous;Actuator includes execution shaft, one end of execution shaft is used for connecting the clamp of measured product, the other end is equipped with driven slot wheel, the circumference outside of driven slot wheel has at least four groups of slots which are uniformly distributed, wherein, two groups of slots at set angle are engaged with corresponding driving dial respectively, driving dial is driven under the transmission mechanism, and is engaged with driven slot wheel alternately, drives driven slot wheel to form intermittent positive and negative rotation motion together with execution shaft, and is output through execution shaft. Through intermittent positive and negative rotation motion, the dynamic load during the repeated action of the measured product can be reproduced, and the material fatigue or structural defects can be more easily exposed, and it is beneficial to obtain more accurate structural durability test results.

Description

Technical Field

[0001] This invention relates to the field of mechanical transmission and quality inspection technology, specifically to a quality inspection device and method for the rotating structure of a product. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] In mechanical products, a rotary structure refers to a mechanical component or mechanism capable of rotating around a fixed axis. Its core function is to achieve continuous circular motion or oscillation within a limited angle. After the mechanical product is manufactured, quality testing is required to verify the effectiveness of the rotary structure during the design, manufacturing, and assembly stages. Quality testing generally involves durability testing, flexibility testing, and other items related to the rotary structure.

[0004] For example, when testing the quality of a product's "door handle," the handle is repeatedly rotated to check for any sticking, abnormal noises, or friction, thus confirming the flexibility of the rotating part. Some tests use a torque meter to measure the torque required for rotation or to check whether the handle's rotation angle meets design requirements. Additionally, the door handle under test can be mounted on a test door panel, and a mechanical device (such as a robotic arm) can simulate human hand movements by rotating and applying unidirectional force to open / close the door. A counter records the number of rotations and opening / closing operations, and by repeating these actions a certain number of times, the stability of the rotating structure is determined, thereby achieving durability testing.

[0005] Traditional testing methods involve manual intervention, resulting in low testing efficiency. While some testing devices can replace manual labor, they require customized design based on the structural differences of the rotating parts of the product and specific testing needs, leading to high costs.

[0006] Secondly, traditional testing methods typically rely on a single parameter such as the number of rotations of the rotating structure within a set time period or the torque during rotation. This makes it difficult to reproduce the dynamic load during repeated rotations of the rotating structure, resulting in an inability to evaluate the comprehensive performance of the product, such as material deformation and surface wear.

[0007] In addition, in traditional testing methods, rotating structures with a single direction of motion are generally tested by continuous rotation. For rotating structures with bidirectional motion, forward and reverse rotation is generally achieved by changing the direction of motor rotation. This method is prone to damaging the motor during long-term operation and has poor stability. Summary of the Invention

[0008] To address the technical problems mentioned above, this invention provides a quality testing device and method for a product's rotating structure. The intermittent motion formed by the outer groove wheel and the dial is coupled with the transmission mechanism to form intermittent forward and reverse motion. This can reproduce the dynamic load during repeated actions of the product under test, making it easier to expose material fatigue or structural defects in the product under test, and facilitating the acquisition of structural durability test results that are more consistent with the actual situation of the product.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] The first aspect of the present invention provides a quality inspection device for a product rotary structure, comprising a power module and a transmission mechanism. The power module generates power and outputs at least two sets of rotary motions in opposite directions and synchronously through the transmission mechanism, thereby driving an actuator to form intermittent forward and reverse rotation motions.

[0011] The actuator includes an actuator shaft. One end of the actuator shaft is used to connect to the fixture of the product being tested, and the other end is provided with a driven groove wheel. The outer circumference of the driven groove wheel has at least four sets of slots evenly distributed. Among them, two sets of slots at a set angle respectively engage with the corresponding drive dial. Driven by the transmission mechanism, the drive dial alternately engages with the driven groove wheel, driving the driven groove wheel and the actuator shaft to form intermittent forward and reverse rotation motion, and output through the actuator shaft.

[0012] Furthermore, the active dial includes a lever and a lever frame connected together. One end of the lever is connected to the output shaft of the transmission mechanism via a fixed block, and the other end has a pin on its surface. When the active dial meshes with the driven grooved wheel, the pin meshes with the transmission groove, and the lever frame meshes with the locking arc.

[0013] Furthermore, the driven grooved wheel has a groove on its outer circumference, the groove including a pair of transmission grooves and a corresponding locking arc, the locking arc forming a pitch angle. θ =360° / n, where n≥4 and n is an even number.

[0014] Furthermore, the ratio between the rotation radius of the active dial and the circumscribed circle radius of the driven groove wheel satisfies the set value.

[0015] Furthermore, the transmission mechanism includes a primary drive gear connected to the output shaft of the power module. The primary drive gear meshes with a primary driven gear. The primary driven gear rotates synchronously with at least two sets of secondary drive gears. The secondary drive gear meshes with a corresponding secondary driven gear. The secondary driven gear is connected to the corresponding output shaft. The two sets of output shafts move in opposite directions and move synchronously.

[0016] Furthermore, the actuator is located on one side of the housing, and the active dial is connected to the corresponding output shaft through a fixed block. The output shaft drives the two sets of active dials to rotate in opposite directions and synchronously.

[0017] Furthermore, the power module and the first-stage drive gear are arranged on the same axis, the rotation axes of the first-stage drive gear and the first-stage driven gear are arranged side by side, the first-stage driven gear and the second-stage drive gear are arranged on the same axis, and the second-stage drive gear is arranged on both sides of the first-stage driven gear, with the rotation axes of the second-stage drive gear and the corresponding second-stage driven gear being perpendicular.

[0018] Furthermore, it also includes a torque sensor, a Hall sensor, and a displacement sensor. The torque sensor is used to acquire the torque during the rotation of the output shaft, the Hall sensor is used to acquire the number of cycles of the actuator shaft performing intermittent forward and reverse motion, and the displacement sensor is used to acquire the displacement change during the intermittent forward and reverse motion of the actuator shaft.

[0019] Furthermore, the power module and transmission mechanism are located inside the housing, which includes an upper cover and a housing base. The top of the upper cover has an observation window connected to a transparent window plate. The upper cover and the housing base are connected by a housing flange.

[0020] A second aspect of the present invention provides a quality inspection method for a product rotating structure, implemented based on the above-described apparatus, comprising the following steps:

[0021] Based on the testing requirements of the product under test, determine the time it takes for the rotary structure to complete one intermittent forward and reverse rotation, and set the output speed of the power module in combination with the speed ratio of the transmission mechanism.

[0022] The actuator shaft is connected to the product under test via a fixture. The power module is controlled to operate according to the set speed. The power module drives the product under test to form intermittent forward and reverse motion through the transmission mechanism and the actuator, that is, a motion cycle of forward rotation-pause-reverse rotation-pause.

[0023] By acquiring the torque of the output shaft and monitoring the torque fluctuations during intermittent forward and reverse rotation, rotational flexibility testing can be achieved.

[0024] The number of cycles of intermittent forward and reverse motion is obtained until a set threshold is reached or the tested product shows cracks or functional failure, thus achieving structural durability testing.

[0025] After a pause in the detection process, the angle or displacement change of the rotating structure is acquired to verify the reset accuracy of the rotating structure.

[0026] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects:

[0027] 1. Traditional tests are generally continuous rotation tests, which cannot simulate the performance of some products under alternating forward and reverse operation conditions (such as the rapid opening and closing action of door handles, and the snap-fit ​​surface of rotating seals). This solution forms an intermittent forward and reverse motion of forward rotation-stop-reverse rotation-stop, which can simulate the start-stop and reversing scenarios in real use, reproduce the dynamic load of the rotating structure of the tested product during repeated actions, and more easily expose the material fatigue or structural defects of the rotating structure, which is conducive to obtaining structural durability test results that are more in line with the actual situation of the product.

[0028] 2. The intermittent rotary motion is achieved through pure mechanical transmission, ensuring high precision, reliability, and stability. The transmission mechanism ensures that the two sets of dials move in opposite directions and synchronously. The engagement structure between the dials and the grooved wheel is mechanically forced, resulting in higher reliability and no delay compared to sensor-controlled motor start / stop methods. Furthermore, the forward and reverse entry / exit is smoother, with less impact, and it can also reduce errors introduced by the testing device itself during durability testing.

[0029] 3. During testing, by adjusting the output speed of the power module and cooperating with the deceleration function of the transmission mechanism, it can output high torque while maintaining the efficient speed range of the power module. It can also flexibly adapt to the different testing requirements of different products for the rotary structure, reduce the human intervention during traditional testing, have higher reliability, and ensure stability during high-frequency testing.

[0030] 4. Traditional testing methods typically require step-by-step testing of flexibility, durability, and other parameters, resulting in low efficiency and difficulty in coordinating multi-parameter testing. This solution, however, can simultaneously complete flexibility testing, structural durability testing, and reset accuracy verification of a rotating structure in a single test. For example, fluctuations in the torque curve can monitor for jamming during forward and reverse rotation, reflecting wear issues in internal components and facilitating the analysis of design, manufacturing, or assembly defects. Cycle counts can quantify the lifespan of the rotating structure, enabling comparative analysis with the design lifespan. Monitoring changes in reset angle or displacement during each intermittent movement can determine deviations and assess the accuracy of internal components such as springs / limiting mechanisms. Furthermore, cycle counts can be combined to analyze changes in the reset angle over the operating cycle.

[0031] 5. The device is modular in its overall structure, which can be used with different fixtures to meet the testing requirements of different products' rotary structures. It can also be used with extended high and low temperature test chambers to meet the testing requirements of the tested products under different temperature environments. Attached Figure Description

[0032] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0033] Figure 1 This is a schematic diagram of the overall structure of the quality inspection device provided in one or more embodiments of the present invention;

[0034] Figure 2 This is a perspective structural diagram of a quality inspection device provided in one or more embodiments of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the actuator in one or more embodiments of the quality inspection device provided by the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of the active dial and the driven grooved wheel in the actuator provided by one or more embodiments of the present invention;

[0037] Figure 5 This is a schematic diagram of the transmission mechanism in one or more embodiments of the quality inspection device provided by the present invention;

[0038] Figure 6 This is a schematic diagram of the structure of the output part of the transmission mechanism provided in one or more embodiments of the present invention;

[0039] Figure 7 This is a schematic diagram of the structure of the input part of the transmission mechanism provided in one or more embodiments of the present invention;

[0040] Figure 8 This is a schematic diagram of the housing structure of a quality inspection device provided in one or more embodiments of the present invention.

[0041] In the diagram: 1. Actuating shaft; 2. Pulley; 3. Driven grooved wheel; 301. Locking arc; 302. Transmission groove; 4. Driving dial; 401. Pin; 5. Fixing block; 6. Input shaft bearing housing; 7. First-stage driving gear; 8. Input shaft sleeve; 9. Coupling; 10. Motor housing; 11. Servo motor; 12. First output shaft bearing; 13. Intermediate shaft bearing housing; 14. First intermediate shaft sleeve; 15. Output shaft; 16. Output shaft planar bearing housing; 17. Output shaft sleeve; 18. Output shaft vertical bearing housing; 19. Secondary driven gear; 20. First output shaft retaining ring; 21. Secondary driving gear; 22. Second intermediate shaft sleeve; 23. Through hole; 24. Reinforcing rib; 25. Housing base; 26. Housing flange; 27. Top cover; 28. Observation window; 29. ​​Window plate; 30. Primary driven gear; 31. Second output shaft bearing; 32. Second output shaft retaining ring; 33. Output shaft shoulder. Detailed Implementation

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0043] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0044] Example 1:

[0045] This embodiment takes the quality testing of a "door handle" as an example, including rotation flexibility test, structural durability test, and reset accuracy verification.

[0046] Rotational flexibility test, which involves monitoring torque fluctuations during the rotation of the door handle.

[0047] Structural durability testing, i.e., the door handle develops visible cracks or malfunctions after being repeatedly turned a set number of times.

[0048] Reset accuracy verification, that is, detecting the displacement or angle deviation of the door handle when it resets to the initial position after intermittent pauses.

[0049] like Figures 1-2 As shown, the quality inspection device for the product's rotating structure includes:

[0050] The outer casing houses the power module and transmission mechanism. The power module generates power, which is then output through the transmission mechanism as two sets of opposite and synchronous rotary motions.

[0051] The actuator, located on one side of the housing, uses the rotary motion output from the transmission mechanism to convert the periodic forward and reverse rotation of the actuator shaft.

[0052] The transmission mechanism includes a primary transmission unit and a secondary transmission unit. The primary transmission unit receives the rotational power from the power module and outputs rotational motion with a set speed ratio to the secondary transmission unit. The secondary transmission unit forms two sets of synchronous and opposite rotational motions, which are transmitted to the actuator through two sets of output shafts.

[0053] like Figure 3 As shown, the actuator includes an actuator shaft 1. One end of the actuator shaft 1 is used to connect to the fixture of the product being tested, and the other end is provided with a driven grooved wheel 3. The driven grooved wheel 3 meshes with two sets of oppositely arranged driving dials 4. The driving dials 4 are connected to the corresponding output shaft in the transmission mechanism through a fixed block 5.

[0054] The active dial 4 includes a lever and a lever 2. The lever is driven by the output shaft in the transmission mechanism through the fixed block 5 to generate a rotational motion. The lever 2 meshes with the driven grooved wheel 3. Under the driving action of the lever, the lever 2 alternately drives the driven grooved wheel 3 to move, so that the driven grooved wheel 3 together with the actuator shaft 1 forms a periodic forward and reverse rotation motion.

[0055] like Figure 4 As shown, the driven groove wheel 3 has a groove on its outer circumference. The groove includes a pair of transmission grooves 302 and a corresponding locking arc 301. Each transmission groove 302 is arranged along the radial direction of the driven groove wheel 3, and the locking arc 301 forms a pitch angle. θ =360° / n, where n≥4 and n is an even number.

[0056] like Figure 4 As shown, the active dial 4 includes a lever and a lever 2 connected together. One end of the lever is connected to the output shaft of the transmission mechanism through a fixing block 5, and the other end is provided with a pin 401. When the active dial 4 is engaged with the driven groove wheel 3, the pin 401 is engaged with the transmission groove 302, and the lever 2 is engaged with the locking arc 301.

[0057] In this embodiment, the driven grooved wheel 3 is a four-groove external grooved wheel structure with a pitch angle of 90° and a pitch angle error of ≤0.5°. The two sets of driving dials 4 are respectively arranged in two opposite pitch angle regions, namely the 0-90° range and the 180°-270° range, or the 90°-180° range and the 270°-360° range. The ratio of the rotation radius of the driving dial 4 to the circumscribed circle radius of the driven grooved wheel 3 is approximately 1:1. The material is 40Cr, and the surface is hardened to HRC50-55.

[0058] During operation, the transmission mechanism drives the two sets of active dials 4 to rotate synchronously via the fixed block 5. Each time an active dial 4 rotates once, the pin 401 extends into the transmission groove 302 and engages with it, causing the driven groove wheel 3 to rotate 90°, completing one cycle. Meanwhile, the lever 2 engages with the locking arc 301, preventing the driven groove wheel 3 from continuing to rotate, thus stopping it for one cycle. Since the two sets of active dials 4 are respectively arranged in two opposing angle regions of the driven groove wheel 3 (i.e., the rotation centers of the two sets of active dials 4 are 180° relative to the driven groove wheel 3), the above two actions are performed alternately by the two sets of active dials 4, forming a "rotation-stop-rotation-stop" cycle. During this period, because the two sets of active dials 4 move in opposite directions, the above cycle forms an intermittent forward and reverse rotation motion of "forward rotation-stop-reverse rotation-stop".

[0059] In this embodiment, the ratio of the rotation radius of the active dial 4 to the circumcircle radius of the driven grooved wheel 3 is approximately 1:1. The rotation radius R1 of the active dial 4 is C*sin(π / z), and the circumcircle radius R2 of the driven grooved wheel 3 is √[(C·cos(π / z))² + r²], where C is the center distance, z is the number of grooves, and r is the radius of the pin 401. The calculated ratio is approximately 1:1.

[0060] Understandably, when the number of slots in the driven grooved wheel increases from 3 to 6 or 8, in order to avoid interference between the movement of the lever and the grooved wheel, the radius of the lever needs to be adjusted synchronously. At the same time, the outer diameter of the grooved wheel, the locking structure, the motion parameters, and the material process need to be modified in conjunction.

[0061] For this application scenario, a detachable modular design can be adopted, configuring Geneva wheel actuators in three specifications: 4-slot, 6-slot, and 8-slot. For example, when it is necessary to detect a device with a 60° rotation angle, simply replace it with a 6-slot actuator; similarly, when it is necessary to detect a device with a 45° rotation angle, replacing it with an 8-slot actuator will achieve the desired adaptation. At the same time, the radius ratio of the active dial 4 to the 6-slot driven Geneva wheel 3 is approximately 1:1.7 according to the formula.

[0062] When the transmission mechanism outputs two sets of synchronous and opposite rotary motions, it creates a periodic engagement-disengagement action between the driving dial 4 and the driven grooved wheel 3, converting continuous rotary motion into intermittent rotary motion. That is, each rotation triggers four intermittent pauses, and after each pause, the direction of the next rotation is opposite to the previous one. The pause interval is controlled by the speed of the power module and the reduction ratio of the transmission mechanism, simulating the start-stop frequency of the door handle in actual use (e.g., completing one opening and closing cycle every 2 seconds).

[0063] This intermittent forward and reverse motion is achieved using a Geneva wheel and a dial, which is less expensive than a cam mechanism and simpler to maintain than a servo motor and controller solution. Structurally, it offers dynamic controllability, and its smooth start-stop performance surpasses that of ratchet / incomplete gears, making it suitable for precision indexing. Furthermore, the number of slots and the arrangement of the dials can be adapted to meet the needs of intermittent motion with different rotation angles.

[0064] During testing, the rotary structures of different products vary significantly. Modular fixtures can be pre-set to accommodate different rotary structures. Simultaneously, different rotary structures require different torques during testing. This solution utilizes frequency conversion speed regulation to adjust the AC motor power supply frequency f, thereby indirectly controlling the torque T to match varying torque requirements.

[0065] Furthermore, the dual-lever structure design of this solution achieves a working sequence where the motion time is greater than the stationary time, resulting in a 100% improvement in efficiency compared to a single-lever design. The shape of the pin 401 adopts a precise fit structure with a cylindrical body and a semi-circular groove bottom, achieving a uniform distribution of contact stress and effectively improving the service life of the component. The plate-shaped rotating arm replaces the solid dial, achieving a reduction in mass and optimization of the moment of inertia.

[0066] The structure of the transmission mechanism is as follows Figures 5-7 As shown, the output shaft of the power module is connected to the primary transmission unit via coupling 9. Coupling 9 is a rigid transmission, which can reliably transmit the power generated by the power module to the transmission mechanism.

[0067] In this embodiment, the coupling 9 can be a diaphragm coupling to achieve a transmission efficiency of 0.99, torsional stiffness ≥100N·m / rad, and coaxiality error ≤0.05mm.

[0068] In this embodiment, the power module can be a servo motor 11, which is fixed on a motor mount 10. The motor mount 10 is connected inside the housing. The servo motor 11 is a mature product, and its speed can be precisely controlled by changing the current or voltage.

[0069] For example, servo motor 11 has a power ≥200W and an adjustable speed of 0-3000rpm. A Y-series three-phase asynchronous motor can be selected, with a full-load speed of 970r / min and a stall torque of 2.2 times the rated torque.

[0070] In this embodiment, the fixture for the product under test is not specifically limited and can be adapted to the corresponding product under test, such as cylindrical / irregular handles, with an adjustable clamping force of 10-50N. The actuator 1 is connected to the door handle shaft via the fixture (torsional stiffness ≥100N·m / rad).

[0071] like Figures 5-7 As shown, the primary transmission unit includes at least two sets of input shaft bearing seats 6 arranged in parallel inside the housing. The input shaft bearing seats 6 are provided with bearings and input shaft sleeves 8. A primary drive gear 7 is provided between the two sets of input shaft bearing seats 6. The primary drive gear 7 meshes with a primary driven gear 30.

[0072] In this embodiment, the primary transmission unit is equipped with a rotating shaft. One end of the rotating shaft is connected to the output shaft of the servo motor 11 via a coupling 9, and the other end passes through two sets of input shaft sleeves 8 and corresponding bearings, and is movably connected to the corresponding input shaft bearing seat 6. A primary drive gear 7 is provided on the rotating shaft. The primary driven gear 30 is located between two sets of parallel intermediate shaft bearing seats 13, and each set of intermediate shaft bearing seats 13 is equipped with a corresponding intermediate shaft sleeve (first intermediate shaft sleeve 14 and second intermediate shaft sleeve 22). This structure allows the output shaft of the servo motor 11 and the rotating shaft of the primary drive gear 7 to be arranged coaxially, achieving reliable rotation with the support of at least two sets of bearings, and avoiding axial movement and radial runout.

[0073] The secondary transmission unit includes secondary drive gears 21 disposed at both ends of the intermediate shaft bearing housing 13. Each set of secondary drive gears 21 meshes with a corresponding secondary driven gear 19, and the secondary driven gear 19 is connected to a corresponding output shaft 15. This structure transforms the rotary motion from the primary transmission unit into two sets of rotary motions moving in opposite directions and synchronously, which are ultimately output through two sets of parallel-arranged output shafts 15 to support subsequent actuators.

[0074] In this embodiment, the two ends of the shaft of the first-stage driven gear 30 pass through the intermediate shaft sleeve (first intermediate shaft sleeve 14 or second intermediate shaft sleeve 22) and the intermediate shaft bearing seat 13 respectively, and are connected to the second-stage driving gear 21. The second-stage driven gear 19 is connected to one end of the output shaft 15 and is prevented from axial movement by the first output shaft retaining ring 20. The other end passes through the output shaft vertical bearing seat 18, the output shaft sleeve 17 and the output shaft plane bearing seat 16, and is fixedly connected to the fixing block 5 of the actuator, so that the rotation of the output shaft 15 is reliable.

[0075] In this embodiment, the vertical bearing housing 18 of the output shaft is provided with a first output shaft bearing 12, and the planar bearing housing 16 of the output shaft is provided with a second output shaft bearing 31. The two sets of bearings cooperate to support the rotation of the output shaft 15.

[0076] The output shaft 15 has a shoulder, namely the output shaft shoulder 33. One end of the second output shaft bearing 31 abuts against the output shaft shoulder 33, and the other end is provided with a second output shaft retaining ring 32 to prevent the second output shaft bearing 31 from moving axially.

[0077] In this embodiment, the first-stage driving gear 7 and the first-stage driven gear 30 are cylindrical spur gear sets with a reduction ratio of 3:1. The second-stage driving gear 21 and the second-stage driven gear 19 are bevel gear sets with a reduction ratio of 2:1. The transmission mechanism formed by the two sets of gear sets (precision grade 8, oil lubrication, efficiency 0.97) has a total reduction ratio of 6:1.

[0078] The motor output power is reduced in speed and increased in torque through a gear set (first-stage reduction), and then the power direction is changed to the horizontal axis through a bevel gear set (second-stage reduction), providing a stable power input to the actuator. The reduction ratio can be adjusted according to the requirements of different door handle models to ensure that the output torque matches the testing requirements (e.g., a conventional door handle requires 5-10 N·m of torque).

[0079] The structure of the outer shell is as follows Figure 8 As shown, the outer casing includes an upper cover 27 and a housing base 25. The top of the upper cover 27 has an observation window 28, which is connected to a transparent window plate 29. The upper cover 27 and the housing base 25 are connected by a housing flange 26. The side of the housing base 25 has a through hole 23, allowing the fixing block 5 of the actuator to pass through the outer casing and connect with the transmission mechanism. The housing base 25 has reinforcing ribs 24.

[0080] The working principle of this solution is as follows:

[0081] The transmission mechanism converts the power generated by the power module into two sets of opposite and synchronous rotary motions, which are output to the outside of the housing through two sets of output shafts 15. The fixed block 5 in the actuator is connected to the corresponding output shaft 15, so that the two sets of active dials 4 mesh with the two indexing angle areas of the driven groove wheel 3 arranged opposite to each other, driving the driven groove wheel 3 together with the actuator shaft to form an intermittent rotary motion. After each interval, the previous rotation direction is opposite to the next rotation direction, forming a "forward rotation-stop-reverse rotation-stop" motion cycle, thereby simulating the action during the door handle test and reproducing the dynamic load during the repeated action of the door handle rotary mechanism.

[0082] In this embodiment, the intermittent motion of the actuator 1 drives the door handle under test to rotate periodically in both directions, completing the following quality inspection items through a preset number of cycles (e.g., 50,000 times):

[0083] Rotational flexibility test: A torque sensor (range 0-200 N·m, accuracy ±0.5%FS) is installed on the output shaft 15 of the transmission mechanism to monitor torque fluctuations during rotation (abnormal jamming threshold > 1.5 N·m).

[0084] Structural durability test: Using a Hall sensor (sampling frequency 1kHz), the number of cycles is recorded and a shutdown threshold is set (default 100,000 cycles). The number of cycles is counted until a visible crack appears in the door handle or the function fails.

[0085] Reset accuracy verification: Using a laser displacement sensor (resolution 0.1μm), after a pause in the detection interval, the deviation position or deviation angle of the door handle returning to the initial position is measured (allowable error ≤ ±1°).

[0086] Traditional tests are usually continuous rotation tests, which cannot simulate the start-stop and reversing conditions of door handles in actual use (such as suddenly releasing the handle after quickly opening the door). However, this solution forms intermittent rotational motion, which can reproduce the dynamic load during repeated actions, making it easier to expose material fatigue or structural defects, and is conducive to obtaining structural durability test results that are more in line with the actual situation of the product.

[0087] In traditional testing, while some devices can achieve intermittent motion, this often relies on controlling components such as motors (e.g., by intermittently changing the motor's direction). This depends on the precision of electrical control and the direct control of the motor can easily damage the motor coils. In contrast, this solution uses pure mechanical transmission for the intermittent rotary motion. Only the motor speed needs to be set for testing; the motor itself does not need to repeatedly change direction, maintaining stable unidirectional operation. This reduces human intervention during traditional testing, resulting in higher reliability, and also ensures stability during high-frequency testing.

[0088] In traditional testing, a single speed test is difficult to simultaneously meet the requirements of high torque (test intensity) and low speed (simulating human operation). This solution uses a transmission mechanism formed by a cylindrical and bevel gear, which has a wide range of reduction ratio adjustment. It can output high torque while maintaining the high-efficiency speed range of the motor. Furthermore, by adjusting the speed of the motor and the speed ratio of the transmission mechanism, it can flexibly adapt to the test parameters of different handle models.

[0089] Traditional methods require testing flexibility, durability, and other parameters step-by-step, resulting in low efficiency and a lack of synergistic effects. This solution, however, can complete all three tests simultaneously in a single cycle:

[0090] By monitoring the fluctuations in the torque curve, the sticking phenomenon during the rotation of the door handle can be detected, reflecting the wear problem of the internal parts of the door handle, which is helpful for analyzing design, manufacturing or assembly defects.

[0091] By counting the number of cycles, the lifespan of the door handle can be quantified, which is beneficial for comparative analysis with the designed lifespan.

[0092] By monitoring the reset angle during each intermittent movement, the deviation can be determined and the accuracy of the spring / limiting mechanism inside the door handle can be evaluated. The change of the reset angle with the running cycle can also be analyzed by combining the cycle count statistics.

[0093] Furthermore, conventional tests are conducted in a constant temperature and humidity environment, ignoring the impact of actual environmental changes. This solution forms a modular testing device that can place the door handle under test, along with fixtures and other accessories, into a high and low temperature chamber. Combined with temperature and humidity sensors, it tests the quality performance of the door handle under different temperature environments, such as verifying the impact of lubricant evaporation on flexibility and the increase in torque caused by material brittleness.

[0094] Example 2:

[0095] Based on the apparatus in Embodiment 1, a quality inspection method for a product rotary structure is implemented, comprising the following steps:

[0096] Based on the testing requirements of the product under test, determine the time it takes for the rotary structure to complete one intermittent forward and reverse rotation, and set the output speed of the power module in combination with the speed ratio of the transmission mechanism.

[0097] The actuator shaft is connected to the product under test by a fixture. The power module is controlled to operate according to the set speed. The power module drives the product under test to form intermittent forward and reverse motion through the transmission mechanism and the actuator, that is, a motion cycle of forward rotation-stop-reverse rotation-stop.

[0098] By acquiring the torque of the output shaft and monitoring the torque fluctuations during intermittent forward and reverse rotation, rotational flexibility testing can be achieved.

[0099] The number of cycles of intermittent forward and reverse motion is obtained until a set threshold is reached or the tested product shows visible cracks or functional failure, thus achieving structural durability testing.

[0100] After a pause in the detection process, the angle or displacement change of the rotating structure is acquired to verify the reset accuracy of the rotating structure.

[0101] In this embodiment, the power transmission path during the detection period is: motor → cylindrical gear set (first-stage reduction) → bevel gear set (second-stage reduction) → driving dial → driven grooved wheel → door handle clamp.

[0102] Before testing, the power supply frequency f is changed by frequency conversion speed regulation, which in turn adjusts the speed n and indirectly controls the torque T. This is to match the torque requirements of different door handles (typically 5-10 N·m). After calibration, the total transmission efficiency is ≥0.94 (calculation formula: η=ηgear×ηbearing=0.97×0.98=0.95).

[0103] Set detection parameters:

[0104] Dynamic load adjustment: Preset torque threshold based on door handle material (e.g., ABS plastic or zinc alloy) (e.g., ABS: 5 N·m, zinc alloy: 8 N·m);

[0105] Cyclic frequency control: The driven groove wheel triggers 4 intermittent pauses every one revolution. The interval time is set to 2 seconds / time according to the actual use scenario. The output speed of the servo motor is calculated by the reduction ratio.

[0106] Clamping: Use an adjustable clamp (clamping force adjustable from 10-50N) to fit cylindrical / irregular door handles and connect to the actuator shaft.

[0107] During the testing period:

[0108] Torque stability detection: Obtain the torque fluctuation curve throughout the rotation process, and set the abnormal jamming threshold to 15% of the preset value (e.g., the jamming alarm threshold for zinc alloy door handles = 8 × 1.15 = 9.2 N·m).

[0109] Durability testing: The machine automatically stops to check for surface cracks when the number of cycles reaches 50,000 (visual inspection + laser roughness analysis);

[0110] Reset accuracy verification: The reset angle deviation is measured by a laser sensor. Products exceeding the tolerance (>1°) are marked as unqualified.

[0111] Classification criteria: qualified products (torque fluctuation <10%, reset deviation ≤1°), products awaiting re-inspection (single parameter exceeds limit), and scrapped products (structural cracks or functional failure).

[0112] Data closure: Generate a torque-cycle count-reset angle correlation curve for subsequent optimization of door handle mold design (e.g., push mold correction suggestions when a batch of torque dispersion is detected to be >12%).

[0113] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A quality inspection device for a product rotating structure, characterized in that, The power module generates power, and at least two groups of rotary motions in opposite directions and synchronously are output through the transmission mechanism to drive the actuating mechanism to form intermittent forward and reverse rotation; The actuating mechanism includes an actuating shaft, one end of the actuating shaft is used for connecting a clamp of the measured product, and the other end is provided with a driven slot wheel, the circumferential outer side of the driven slot wheel is provided with at least four groups of uniformly distributed notches, wherein two groups of notches at a set angle are respectively engaged with corresponding driving dials, the driving dials are alternately engaged with the driven slot wheel under the driving of the transmission mechanism, the driven slot wheel is driven to form intermittent forward and reverse rotation together with the actuating shaft, and the actuating shaft outputs the intermittent forward and reverse rotation; the measured product is a door handle; The driving dials are arranged in two opposite angle division regions, i.e. 0-90° and 180°-270°, or 90°-180° and 270°-360°. The active dial includes a dial rod and a dial frame connected together, one end of the dial rod is connected to the output shaft of the transmission mechanism through a fixed block, and the other end is provided with a pin shaft; the circumferential outer side of the driven slot wheel has a notch, the notch includes a pair of transmission slots and a corresponding locking arc, when the active dial is engaged with the driven slot wheel, the pin shaft is engaged with the transmission slot, and the dial frame is engaged with the locking arc; the division angle formed by the locking arc The transmission mechanism includes a primary driving gear connected with an output shaft of the power module, the primary driving gear is engaged with a primary driven gear, the primary driven gear is synchronously rotated with at least two groups of secondary driving gears, and the two ends of the rotation shaft of the primary driven gear are respectively fixedly connected with the secondary driving gears, the secondary driving gears are engaged with corresponding secondary driven gears, the secondary driven gears are connected with corresponding output shafts, the motion directions of the two groups of output shafts are opposite and the two groups of output shafts are synchronously rotated; the primary driving gear and the primary driven gear form a cylindrical straight gear set, and the secondary driving gears and the secondary driven gears form a conical gear set. =360° / n, n≥4 and n is an even number; The torque sensor, the Hall sensor and the displacement sensor are further provided. The torque sensor is used for acquiring the torque during the rotation of the output shaft, monitoring the torque fluctuation in the intermittent forward and reverse rotation process, and realizing the rotation flexibility test. The Hall sensor is used for acquiring the cycle number of the intermittent forward and reverse rotation of the actuating shaft until a set threshold value is reached or visible cracks or functional failure of the measured product appear, and realizing the structure durability test. The displacement sensor is used for acquiring the displacement change of the actuating shaft during the intermittent forward and reverse rotation, and realizing the reset accuracy verification of the rotary structure. The ratio between the rotary radius of the driving dial and the radius of the circumscribed circle of the driven slot wheel satisfies a set value.

2. The product rotation structure quality inspection apparatus according to claim 1, wherein The power module and the primary driving gear are coaxially arranged, the rotation axes of the primary driving gear and the primary driven gear are arranged side by side, the primary driven gear and the secondary driving gears are coaxially arranged, and the secondary driving gears are arranged on the two sides of the primary driven gear, and the rotation axes of the secondary driving gears and the corresponding secondary driven gears are perpendicular.

3. The product rotation structure quality inspection apparatus according to claim 1, wherein The actuating mechanism is located on one side of the shell, the driving dials in the shell are connected with the corresponding output shafts through the fixed blocks, and the output shafts drive the two groups of driving dials to rotate in opposite directions and synchronously.

4. The product rotation structure quality inspection apparatus according to claim 1, wherein The power module and the transmission mechanism are located in the shell, the shell includes an upper end cover and a box body base, the upper end cover is provided with an observation window at the top end, the observation window is connected with a transparent window plate, and the upper end cover and the box body base are connected through a box flange.

5. The product rotation structure quality inspection apparatus according to claim 1, wherein The method comprises the following steps:

6. A method for quality detection of a product rotation structure, implemented based on the quality detection device according to any one of claims 1-5, characterized in that, According to the test requirements of the measured product, the time for the rotary structure to complete one intermittent forward and reverse rotation is determined, the output rotation speed of the power module is set in combination with the speed ratio of the transmission mechanism. ​ The execution shaft is connected with the measured product through the clamp, the power module is controlled to act according to the set rotating speed, the power module drives the measured product to form intermittent forward and reverse rotation motion, namely, the motion cycle of forward rotation-pause-reverse rotation-pause through the transmission mechanism and the execution mechanism; The torque fluctuation in the intermittent forward and reverse rotation motion is monitored by acquiring the torque of the output shaft, so that the rotating flexibility test is realized; The cycle number of the intermittent forward and reverse rotation motion is acquired until the set threshold value is reached or the measured product appears cracks or functional failure, so that the structure durability test is realized; After the intermittent pause is detected, the angle change or displacement change of the rotary structure is acquired, so that the reset accuracy verification of the rotary structure is realized.

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