Quality detection device and method for product rotation structure

Abstract

The invention relates to the technical field of mechanical transmission and quality detection, in particular to a product rotation structure quality detection device and method.The device comprises a shell used for containing a power module and a transmission mechanism, the power module generates power, and at least two sets of synchronous rotation motions in opposite directions are output through the transmission mechanism; the executing mechanism comprises an executing shaft, one end of the executing shaft is used for being connected with a clamp of a tested product, the other end of the executing shaft is provided with a driven groove wheel, at least four sets of notches are evenly distributed in the outer side of the circumference of the driven groove wheel, the two sets of notches located at the set angle are meshed with the corresponding driving drive plates respectively, and the driving drive plates are driven by the transmission mechanism to rotate. And the driven grooved wheel is alternately meshed with the driven grooved wheel to drive the driven grooved wheel and the execution shaft to form intermittent forward and reverse rotation motion which is output through the execution shaft. Through intermittent forward and reverse rotation motion, the dynamic load of the tested product during repeated motion can be reproduced, material fatigue or structural defects can be exposed more easily, and a more accurate structural durability test result can be obtained.

Description

Technical Field

[0001] The present invention relates to the technical fields of mechanical transmission and quality inspection, and particularly to a quality inspection device and method for a product rotary structure. Background Art

[0002] The statements in this part merely provide background technical 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 that can rotate around a fixed axis, and its core function is to achieve continuous circular motion or limited-angle swinging. After a mechanical product is manufactured, quality testing is required to verify the effects of the rotary structure of the product in the design, manufacturing, and assembly stages. Quality testing generally involves items such as durability testing and flexibility testing of the rotary structure.

[0004] For example, when conducting quality testing on the product "door handle", by repeatedly rotating the handle, it is detected whether there is jamming, abnormal noise, or a feeling of friction to confirm the flexibility of the rotating part. Some detections use a torque meter to measure the torque required for rotation, or check whether the rotation angle of the handle meets the design requirements. In addition, the door handle to be tested can be installed on a test door panel, and a mechanical device (such as a robotic arm) is used to simulate the actions of a human hand to perform rotation and one-way force application for opening / closing the door. The rotation and opening / closing times are recorded by a counter, and the stability of the rotary structure is determined by repeating the actions a certain number of times, thereby achieving durability testing.

[0005] Traditional testing methods have a manual intervention link, resulting in low detection efficiency. Although some detection devices can replace manual labor, they need to be customized according to the structural differences of the rotary parts of the product and in combination with specific detection requirements, with high costs.

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

[0007] In addition, in traditional testing methods, for a rotary structure with a single motion direction, it is generally a continuous rotation test, and for a rotary structure with a two-way motion, the forward and reverse rotations are generally achieved by changing the rotation direction of the motor. This method is prone to damaging the motor during long-term operation and has poor stability. Summary of the Invention

[0008] To solve the technical problems existing in the above-mentioned background art, the present invention provides a quality detection device and method for a product rotary structure, which couples the intermittent motion formed by an external Geneva wheel and a dial with a transmission mechanism to form an intermittent forward and reverse motion, can reproduce the dynamic load during the repeated actions of the product to be measured, is more likely to expose the material fatigue or structural defects of the product to be measured, and is conducive to obtaining more accurate structural durability test results that conform to the actual situation of the product.

[0009] To achieve the above object, the present invention adopts the following technical solutions: In a first aspect of the present invention, there is provided a quality detection device for a product rotary structure, including a power module and a transmission mechanism. The power module generates power and outputs at least two sets of rotary motions with opposite directions and synchronization through the transmission mechanism, and forms an intermittent forward and reverse motion by driving an actuator. The actuator includes an actuator shaft. One end of the actuator shaft is used to connect a fixture of the product to be measured, and the other end is provided with a driven Geneva wheel. The outer circumference of the driven Geneva wheel has at least four sets of equally distributed notches. Among them, two sets of notches at a set angle are respectively engaged with corresponding driving dials. Driven by the transmission mechanism, the driving dials alternately engage with the driven Geneva wheel, driving the driven Geneva wheel together with the actuator shaft to form an intermittent forward and reverse motion, and outputting through the actuator shaft.

[0010] Further, the driving 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 fixing block, and the other end surface is provided with a pin shaft. When the driving dial engages with the driven Geneva wheel, the pin shaft engages with the transmission groove, and the dial frame engages with the locking arc.

[0011] Further, the outer circumference of the driven Geneva wheel has notches, and the notches include paired transmission grooves and corresponding locking arcs. The indexing angle formed by the locking arcs θ = 360° / n, where n≥4 and n is an even number.

[0012] Further, the ratio between the rotary radius of the driving dial and the circumradius of the driven Geneva wheel satisfies a set value.

[0013] Further, the transmission mechanism includes a first-stage driving gear connected to the output shaft of the power module. The first-stage driving gear meshes with a first-stage driven gear. The first-stage driven gear rotates synchronously with at least two sets of second-stage driving gears. The second-stage driving gears mesh with corresponding second-stage driven gears. The second-stage driven gears are connected to corresponding output shafts. The motions of the two output shafts are opposite and synchronous.

[0014] Further, the actuator is located on one side of the housing. The driving dials therein are connected to the corresponding output shafts through fixing blocks, and the output shafts drive the two driving dials to perform rotary motions with opposite directions and synchronization.

[0015] Furthermore, the power module and the first-stage driving gear are coaxially arranged, the rotation axes of the first-stage driving gear and the first-stage driven gear are arranged side by side, the first-stage driven gear and the second-stage driving gear are coaxially arranged, and the second-stage driving gears are arranged on both sides of the first-stage driven gear, and the rotation axes of the second-stage driving gears and the corresponding second-stage driven gears are perpendicular to each other.

[0016] Furthermore, it also has a torque sensor, a Hall sensor, and a displacement sensor. The torque sensor is used to obtain the torque during the rotation of the output shaft, the Hall sensor is used to obtain the number of cycles of the intermittent forward and reverse movement of the execution shaft, and the displacement sensor is used to obtain the displacement change during the intermittent forward and reverse movement of the execution shaft.

[0017] Furthermore, the power module and the transmission mechanism are located inside the housing. The housing includes an upper end cover and a box base. An observation window is provided at the top of the upper end cover. The observation window is connected to a transparent window plate. The upper end cover and the box base are connected through a box flange.

[0018] The second aspect of the present invention provides a quality inspection method for the product rotation structure, which is realized based on the above device and includes the following steps: According to the test requirements of the product to be tested, determine the time for the rotation structure to complete one intermittent forward and reverse movement, and combine with the speed ratio of the transmission mechanism to set the output speed of the power module; Connect the execution shaft and the product to be tested through a fixture, control the operation of the power module according to the set speed, and the power module drives the product to be tested to form an intermittent forward and reverse movement through the transmission mechanism and the execution mechanism, that is, a movement cycle of forward rotation - pause - reverse rotation - pause; By obtaining the torque of the output shaft and monitoring the torque fluctuation during the intermittent forward and reverse movement, the rotational flexibility test is realized; Obtain the number of cycles of the intermittent forward and reverse movement until the set threshold is reached or cracks or functional failures occur in the product to be tested, and the structural durability test is realized; After detecting the intermittent pause, obtain the angular change or displacement change of the rotation structure to verify the reset accuracy of the rotation structure.

[0019] Compared with the prior art, the above one or more technical solutions have the following beneficial effects: 1. Traditional tests are generally continuous rotation tests and cannot simulate the performance of some products under the working conditions of alternating forward and reverse rotations (such as the quick opening and closing actions of a door handle, the clamping surface of a snap-on rotary seal for installing a snap-fastener). However, this solution forms an intermittent forward and reverse movement of forward rotation - pause - reverse rotation - pause, which can simulate the start-stop and commutation scenarios in actual use, reproduce the dynamic load of the rotation structure of the product to be tested during repeated actions, and is more likely to expose the material fatigue or structural defects of the rotation structure, which is beneficial to obtaining more test results of structural durability that are more in line with the actual situation of the product.

[0020] 2. The intermittent rotary motion is achieved by pure mechanical transmission, with reliable accuracy and strong stability. The transmission mechanism ensures that the motion directions of the two sets of dials are opposite and synchronous, and the structure of the dial meshing with the Geneva wheel is mechanically forced. Compared with the motor start / stop method controlled by sensors, it has higher reliability, no delay, smoother cut-in / cut-out during forward and reverse rotations, less impact, and can also reduce the errors brought by the detection device itself during the durability test.

[0021] 3. During the detection, by adjusting the output speed of the power module and coordinating with the deceleration function of the transmission mechanism, it can output high torque and maintain the efficient speed range of the power module, and can flexibly adapt to the different detection requirements of different products for the rotary structure, reducing the manual intervention during traditional detection, having higher reliability, and can also ensure the stability during high-frequency detection.

[0022] 4. Traditional detection methods generally need to test items such as flexibility and durability step by step, with low efficiency and difficult to achieve multi-item collaborative testing. However, this solution can synchronously complete the flexibility test, structural durability test and reset accuracy verification of the rotary structure through a single detection. For example: the stuttering phenomenon during the forward and reverse rotations of the rotary structure can be monitored through the fluctuation of the torque curve, reflecting the wear problem of the internal parts of the rotary structure, which is beneficial to analyzing design, manufacturing or assembly defects. The life of the rotary structure can be quantified through cycle count statistics, which is beneficial to comparative analysis with the design life. The deviation can be determined by monitoring the reset angle or displacement change during each intermittent motion, and the accuracy of parts such as springs / limit mechanisms inside the rotary structure can be evaluated. It can also analyze the change of the reset angle with the operation cycle in combination with cycle count statistics.

[0023] 5. The device forms a modular structure as a whole, can cooperate with different fixtures to meet the detection requirements of the rotary structures of different products, and can also cooperate with an extended high and low temperature test chamber to meet the detection requirements of the tested products in different temperature environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0025] Figure 1 is a schematic diagram of the overall structure of the quality detection device provided by one or more embodiments of the present invention; Figure 2 is a perspective structure diagram of the quality detection device provided by one or more embodiments of the present invention; Figure 3 is a structure diagram of the actuator in the quality detection device provided by one or more embodiments of the present invention; Figure 4 It is a schematic structural diagram of the cooperation between the driving dial and the driven sprocket in the actuator provided by one or more embodiments of the present invention; Figure 5 It is a schematic structural diagram of the transmission mechanism in the quality inspection device provided by one or more embodiments of the present invention; Figure 6 It is a schematic structural diagram of the output part of the transmission mechanism provided by one or more embodiments of the present invention; Figure 7 It is a schematic structural diagram of the input part of the transmission mechanism provided by one or more embodiments of the present invention; Figure 8 It is a schematic structural diagram of the housing of the quality inspection device provided by one or more embodiments of the present invention.

[0026] In the figure: 1, execution shaft; 2, bracket; 3, driven sprocket; 301, locking arc; 302, transmission groove; 4, driving dial; 401, pin shaft; 5, fixed block; 6, input shaft bearing seat; 7, first-stage driving gear; 8, input shaft sleeve; 9, coupling; 10, motor seat; 11, servo motor; 12, first output shaft bearing; 13, intermediate shaft bearing seat; 14, first intermediate shaft sleeve; 15, output shaft; 16, output shaft flat bearing seat; 17, output shaft sleeve; 18, output shaft vertical bearing seat; 19, second-stage driven gear; 20, first output shaft retaining ring; 21, second-stage driving gear; 22, second intermediate shaft sleeve; 23, through hole; 24, reinforcing rib; 25, box base; 26, box flange; 27, upper end cover; 28, observation window; 29, window plate; 30, first-stage driven gear; 31, second output shaft bearing; 32, second output shaft retaining ring; 33, output shaft shoulder. Specific embodiments

[0027] The present invention will be further described below in conjunction with the drawings and embodiments.

[0028] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0029] Embodiment 1: This embodiment takes the quality inspection of the "door handle" as an example, including the rotation flexibility test, the structural durability test, and the reset accuracy verification.

[0030] The rotation flexibility test, that is, monitoring the torque fluctuation during the rotation of the door handle.

[0031] The structural durability test, that is, visible cracks or functional failures occur when the door handle rotates repeatedly for a set number of times.

[0032] Reset accuracy verification, that is, after detecting the intermittent pause, the displacement deviation or angular deviation of the door handle when it is reset to the initial position is detected.

[0033] As Figure 1 - Figure 2 shown, the quality inspection device for the product rotation structure includes: A housing for accommodating a power module and a transmission mechanism. The power module generates power and outputs two sets of rotational motions that are opposite in direction and synchronous through the transmission mechanism; An actuator located on one side of the housing, which converts the rotational motion output by the transmission mechanism into a periodic forward and reverse rotational motion of the actuator shaft.

[0034] Among them, the transmission mechanism includes a first-stage transmission unit and a second-stage transmission unit. The first-stage transmission unit receives the rotational power of the power module and outputs a rotational motion with a set speed ratio to the second-stage transmission unit. The second-stage transmission unit forms two sets of synchronous and opposite-direction rotational motions and transmits them to the actuator through two output shafts.

[0035] As Figure 3 shown, the actuator includes an actuator shaft 1. One end of the actuator shaft 1 is used to connect the fixture of the product to be measured, and the other end is provided with a driven sprocket 3. The driven sprocket 3 meshes with two sets of oppositely arranged driving dials 4 respectively. The driving dials 4 are connected to the corresponding output shafts in the transmission mechanism through fixing blocks 5.

[0036] The driving dial 4 includes a dial rod and a dial frame 2. The dial rod is driven by the output shaft in the transmission mechanism through the fixing block 5 to generate a rotational motion. The dial frame 2 meshes with the driven sprocket 3. Under the driving action of the dial rod, the dial frame 2 alternately drives the driven sprocket 3 to move, so that the driven sprocket 3 together with the actuator shaft 1 forms a periodic forward and reverse rotational motion.

[0037] As Figure 4 shown, the outer circumference of the driven sprocket 3 has notches. The notches include paired transmission grooves 302 and corresponding locking arcs 301. Each transmission groove 302 is arranged along the radial direction of the driven sprocket 3. The indexing angle formed by the locking arcs 301 θ = 360° / n, where n ≥ 4 and n is an even number.

[0038] As Figure 4 shown, the driving dial 4 includes a dial rod and a dial frame 2 connected together. One end of the dial rod is connected to the output shaft of the transmission mechanism through a fixing block 5, and the other end is provided with a pin shaft 401. When the driving dial 4 meshes with the driven sprocket 3, the pin shaft 401 meshes with the transmission groove 302, and the dial frame 2 meshes with the locking arc 301.

[0039] In this embodiment, the driven sheave 3 is a four-groove outer sheave structure, the indexing angle is 90°, the indexing angle error is ≤0.5°, and the two groups of active dials 4 are respectively arranged in two opposite groups of indexing angle areas, namely, the 0-90° range and the 180°-270° range, or the 90°-180° range and the 270°-360° range. The ratio of the turning radius of the active dial 4 to the circumscribed circle radius of the driven sheave 3 is about 1:1, the material is 40Cr, and the surface quenching HRC50-55.

[0040] During operation, the transmission mechanism drives the two groups of active dials 4 to rotate synchronously through the fixed block 5. Each time the active dial 4 rotates one circle, the pin 401 extends into the transmission groove 302 and engages with it, driving the driven groove wheel 3 to rotate 90°, so that the driven groove wheel 3 moves one cycle; and the shifting frame 2 engages with the locking arc 301 to prevent the driven groove wheel 3 from continuing to rotate, so that the driven groove wheel 3 stops one cycle. Since the two groups of active dials 4 are respectively arranged in two groups of angled areas opposite to the driven groove wheel 3 (that is, the rotation centers of the two groups of active dials 4 are 180° relative to the driven groove wheel 3), the above two steps are alternately performed by the two groups of active dials 4, forming a "rotate-stop-rotate-stop" cycle. During this period, since the movement directions of the two groups of active dials 4 are opposite, the above cycle forms an intermittent forward and reverse movement of "forward-stop-reverse-stop".

[0041] In this embodiment, the ratio of the rotation radius of the active dial 4 to the circumscribed circle radius of the driven groove wheel 3 is ≈1:1, the rotation radius R1 of the active dial 4 = C*sin(π / z), the circumscribed circle radius R2 of the driven groove wheel 3 = √[(C·cos(π / z))² + r²], C is the center distance, z is the number of grooves, and r is the radius of the pin shaft 401. The ratio is approximately 1:1 through calculation.

[0042] It is understandable that when the driven sheave 3 is increased to 6 or 8 grooves, in order to avoid interference between the lever and the sheave movement, the lever radius is adjusted synchronously, and the sheave outer diameter, locking structure, motion parameters and material process need to be modified in conjunction.

[0043] For this application scenario, a detachable modular design can be used to configure three types of groove wheel actuators: 4-slot, 6-slot and 8-slot. For example, when a device with a 60° rotation angle needs to be detected, it can be replaced with a 6-slot actuator; similarly, when a device with a 45° rotation angle needs to be detected, it can be adapted by replacing it with an 8-slot actuator. At the same time, the radius ratio of the active dial 4 to the 6-slot driven groove wheel 3 is about 1:1.7 according to the formula.

[0044] When the transmission mechanism outputs two sets of synchronous and oppositely directed rotary motions, the active dial 4 and the driven groove wheel 3 form a periodic meshing-disengaging action, converting the continuous rotary motion into an intermittent rotary motion, that is, each rotation triggers 4 pauses + pauses, and after each pause, the next rotation direction 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 (such as completing an opening and closing cycle every 2 seconds).

[0045] The use of a grooved wheel + dial to achieve intermittent forward and reverse motion is lower in cost than a cam mechanism and easier to maintain than a servo motor + controller solution. The structure is dynamically controllable, and the smooth start and stop performance is better than that of a ratchet / incomplete gear, making it suitable for precision indexing. The number of grooves and the layout of the pins can also be used to adapt to intermittent motion requirements at different rotation angles.

[0046] During testing, the rotary structures of different products vary greatly. Different rotary structures can be adapted by pre-setting modular fixtures. At the same time, different rotary structures require different torques during testing. This solution can indirectly control the torque T by changing the AC motor power supply frequency f to adjust the speed n through variable frequency speed regulation to match different torque requirements.

[0047] In addition, the double lever structure design of this solution achieves a working sequence in which the movement time is greater than the static time, and the efficiency is improved by 100% compared with the single lever; the shape of the pin 401 adopts a precise fitting structure of a cylinder with a semi-circular arc groove bottom to achieve uniform distribution of contact stress and effectively improve the service life of components; a plate-shaped rotating arm is used instead of a solid dial to achieve mass reduction and optimization of the moment of inertia.

[0048] The structure of the transmission mechanism is as follows Figure 5 - Figure 7 As shown, the output shaft of the power module is connected to the primary transmission unit through a coupling 9. The coupling 9 is a rigid transmission and can reliably transmit the power generated by the power module to the transmission mechanism.

[0049] In this embodiment, the coupling 9 may be a diaphragm coupling to achieve a transmission efficiency of 0.99, a torsional stiffness of ≥100 N·m / rad, and a coaxiality error of ≤0.05 mm.

[0050] In this embodiment, the power module can be a servo motor 11, which is fixed on a motor base 10, and the motor base 10 is connected to the inside of the housing. The servo motor 11 is a mature product and can accurately control the rotation speed by changing the current or voltage.

[0051] For example, the power of the servo motor 11 ≥ 200W, and the rotational speed is adjustable from 0 to 3000 rpm. The Y series three-phase asynchronous motor can be selected, with a full-load rotational speed of 970 r / min and a locked-rotor torque of 2.2 times the rated torque.

[0052] In this embodiment, the fixture of the product to be measured is not specifically limited and can be adapted to the corresponding product to be measured. For example, it can be adapted to a cylindrical / irregular-shaped handle, and the clamping force is adjustable from 10 to 50N. The actuating shaft 1 is connected to the handle shaft through the fixture (torsional stiffness ≥ 100 N·m / rad).

[0053] As Figure 5 - Figure 7 shown, the first-stage transmission unit includes at least two groups of input shaft bearing seats 6 arranged side by side inside the housing. Bearings and input shaft sleeves 8 are provided inside the input shaft bearing seats 6. A first-stage driving gear 7 is provided between the two groups of input shaft bearing seats 6, and the first-stage driving gear 7 meshes with the first-stage driven gear 30.

[0054] In this embodiment, the first-stage transmission unit is provided with a rotating shaft. One end of the rotating shaft is connected to the output shaft of the servo motor 11 through a coupling 9, and the other end passes through the two groups of input shaft sleeves 8 and the corresponding bearings and is movably connected to the corresponding input shaft bearing seat 6. The first-stage driving gear 7 is provided on the rotating shaft. The first-stage driven gear 30 is located between the two groups of parallel intermediate shaft bearing seats 13, and each group of intermediate shaft bearing seats 13 is provided with a corresponding intermediate shaft sleeve (the first intermediate shaft sleeve 14 and the second intermediate shaft sleeve 22). This structure enables the output shaft of the servo motor 11 and the rotating shaft of the first-stage driving gear 7 to be coaxially arranged, and reliable rotation is achieved with the support of at least two groups of bearings, avoiding axial movement and radial runout.

[0055] The second-stage transmission unit includes second-stage driving gears 21 provided at both ends of the intermediate shaft bearing seats 13. Each group of second-stage driving gears 21 meshes with the corresponding second-stage driven gear 19, and the second-stage driven gear 19 is connected to the corresponding output shaft 15. This structure converts the rotational motion from the first-stage transmission unit into two groups of rotational motions in opposite directions and synchronous motions, and finally outputs through the two groups of output shafts 15 arranged side by side to support the subsequent actuating mechanism.

[0056] In this embodiment, both ends of the rotating shaft of the first-stage driven gear 30 pass through the intermediate shaft sleeves (the first intermediate shaft sleeve 14 or the second intermediate shaft sleeve 22) and the intermediate shaft bearing seats 13 and are connected to the second-stage driving gears 21. The second-stage driven gear 19 is connected to one end of the output shaft 15, and axial movement is prevented 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 flat bearing seat 16 and is fixedly connected to the fixed block 5 of the actuating mechanism, making the rotational movement of the output shaft 15 reliable.

[0057] In this embodiment, a first output shaft bearing 12 is provided inside the output shaft vertical bearing seat 18, and a second output shaft bearing 31 is provided inside the output shaft flat bearing seat 16. The two sets of bearings cooperate to support the rotation of the output shaft 15.

[0058] The output shaft 15 has a shaft shoulder, namely the output shaft shoulder 33. One end of the second output shaft bearing 31 abuts against the output shaft shoulder 33, and a second output shaft retaining ring 32 is provided at the other end to prevent the second output shaft bearing 31 from axially moving.

[0059] In this embodiment, the first-stage driving gear 7 and the first-stage driven gear 30 form a spur gear set with a reduction ratio of 3:1, and the second-stage driving gear 21 and the second-stage driven gear 19 form a bevel gear set with a reduction ratio of 2:1. The transmission mechanism formed by the two sets of gear sets (with a precision of grade 8, oil lubrication, and an efficiency of 0.97) has a total reduction ratio of 6:1.

[0060] The power output by the motor is reduced in speed and increased in torque through the gear set (first-stage reduction), and then the power direction is converted to the horizontal axis through the bevel gear set (second-stage reduction) to provide a stable power input for 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 detection requirements (such as a torque of 5-10 N·m for a conventional door handle).

[0061] The structure of the housing is as Figure 8 shown. The housing includes an upper end cover 27 and a housing base 25. An observation window 28 is provided at the top of the upper end cover 27, and the observation window 28 is connected to a transparent window plate 29. The upper end cover 27 and the housing base 25 are connected through a housing flange 26. A through hole 23 is provided on the side of the housing base 25 to allow the fixing block 5 of the actuator to penetrate into the housing and connect to the transmission mechanism. Reinforcing ribs 24 are provided on the housing base 25.

[0062] The working principle of this solution is as follows: The transmission mechanism converts the power generated by the power module into two sets of rotary motions that are opposite in direction and synchronous, and outputs them to the outside of the housing through the two sets of output shafts 15. The fixing block 5 in the actuator is connected to the corresponding output shaft 15, so that the two sets of driving dials 4 are engaged with two indexing angle regions where the driven sprocket wheels 3 are arranged opposite to each other, driving the driven sprocket wheel 3 together with the execution shaft to form an intermittent rotary motion. And after each interval ends, the rotation direction of the previous time and the rotation direction of the next time are opposite, forming a motion cycle of "forward rotation - stop - reverse rotation - stop", so as to simulate the actions during the door handle test and reproduce the dynamic load during the repeated actions of the door handle rotary mechanism.

[0063] In this embodiment, the intermittent motion of the execution shaft 1 drives the door handle under test to rotate periodically in the positive and negative directions, and the following quality inspection items are completed through a preset number of cycles (such as 50,000 times): Rotational flexibility test: Install a torque sensor (range 0 - 200 N·m, accuracy ±0.5% FS) on the output shaft 15 of the transmission mechanism to monitor torque fluctuations during rotation (abnormal jamming threshold > 1.5 N·m); Structural durability test: Use a Hall sensor (sampling frequency 1 kHz) to record the number of cycles and set a shutdown threshold (default 100,000 times), and count the number of cycles until visible cracks or functional failure occur in the door handle; Reset accuracy verification: Use a laser displacement sensor (resolution 0.1 μm). After detecting an intermittent pause, measure the deviation position or deviation angle of the door handle when it resets to the initial position (allowable error ≤ ±1°).

[0064] Traditional tests are generally continuous rotation tests and cannot simulate the start-stop and commutation conditions (such as suddenly letting go after quickly opening the door) in the actual use of the door handle. However, the intermittent rotary motion formed by this solution can reproduce the dynamic load during repeated actions, making it easier to expose material fatigue or structural defects, which is conducive to obtaining more accurate structural durability test results that conform to the actual situation of the product.

[0065] In traditional tests, although some devices can achieve intermittent motion, they often rely on the control of components such as motors (such as by intermittently changing the motor rotation direction). On the one hand, it depends on the electrical control accuracy, and on the other hand, directly controlling the motor is likely to damage the motor coil. During the intermittent rotary motion in this solution, a pure mechanical transmission is adopted. Only the rotation speed of the motor needs to be set to achieve detection. The motor itself does not need to repeatedly change directions and can operate stably in a single direction. This not only reduces the human intervention during traditional detection, has higher reliability, but also can ensure the stability during high-frequency detection.

[0066] In traditional tests, it is difficult for a single rotation speed test to simultaneously meet the requirements of high torque (test intensity) and low speed (simulating human operation). This solution selects a transmission mechanism formed by a cylindrical + conical gear, which has a wide range of reduction ratio adjustments. It can not only output high torque but also maintain the high-efficiency rotation speed range of the motor, and can flexibly adapt to the test parameters of different door handle models by adjusting the rotation speed of the motor and the reduction ratio of the transmission mechanism.

[0067] Traditional methods need to test items such as flexibility and durability step by step, with low efficiency and lack of synergy. This solution can synchronously complete three detections through a single cycle: By monitoring the fluctuations of the torque curve, detect the jamming phenomenon during the rotation of the door handle, and reflect the wear problems of the internal parts of the door handle, which is conducive to analyzing design, manufacturing, or assembly defects; By counting the number of cycles, quantify the lifespan of the door handle, which is conducive to comparative analysis with the designed lifespan; By monitoring the reset angle during each intermittent movement, the deviation is determined to evaluate the accuracy of the spring / limit mechanism inside the door handle. It is also possible to analyze the variation of the reset angle with the operating cycle in combination with the cycle count statistics.

[0068] In addition, conventional tests are carried out in a constant temperature and humidity environment, ignoring the influence of actual environmental changes. This solution forms a modular detection device, which can place the door handle to be tested together with accessories such as fixtures into a high and low temperature chamber. Combining with temperature and humidity sensors, the quality performance of the door handle in different temperature environments is tested. For example, verify the influence of lubricating grease volatilization on flexibility and the torque increase caused by material brittleness.

[0069] Embodiment 2: Based on the device in Embodiment 1, a quality detection method for the rotary structure of the product is realized, including the following steps: According to the test requirements of the product to be tested, determine the time for the rotary structure to complete an intermittent forward and reverse movement, and set the output speed of the power module in combination with the speed ratio of the transmission mechanism. Connect the execution shaft and the product to be tested through a fixture, control the action of the power module according to the set speed, and the power module drives the product to be tested to form an intermittent forward and reverse movement through the transmission mechanism and the execution mechanism, that is, a movement cycle of forward rotation - stop - reverse rotation - stop. By obtaining the torque of the output shaft and monitoring the torque fluctuation during the intermittent forward and reverse movement, the rotational flexibility test is realized. Obtain the cycle count of the intermittent forward and reverse movement until the set threshold is reached or visible cracks or functional failures occur in the product to be tested, and realize the structural durability test. After the detection pause, obtain the angle change or displacement change of the rotary structure to verify the reset accuracy of the rotary structure.

[0070] In this embodiment, the power transmission path during detection is: motor → cylindrical gear set (primary reduction) → bevel gear set (secondary reduction) → active dial → driven Geneva wheel → door handle fixture.

[0071] Before detection, change the power supply frequency f through variable frequency speed regulation → adjust the speed n → indirectly control the torque T to match the torque requirements of different door handles (conventional 5 - 10 N·m). After calibration, the total transmission efficiency ≥ 0.94 (calculation formula: η = η gear × η bearing = 0.97 × 0.98 = 0.95).

[0072] Set detection parameters: Dynamic load adjustment: Preset torque thresholds according to the door handle material (such as ABS plastic or zinc alloy) (such as ABS: 5 N·m, zinc alloy: 8 N·m); Cyclic Frequency Control: The driven sprocket triggers 4 intermittent pauses per revolution. Set the interval time to 2 seconds per time according to the actual usage scenario, and calculate the output speed of the servo motor through the reduction ratio.

[0073] Clamping: Use an adjustable fixture (clamping force adjustable from 10 - 50N) to adapt to cylindrical / irregular door handles and connect to the execution shaft.

[0074] During Detection: Torque Stability Detection: Obtain the torque fluctuation curve throughout the rotation. Set the abnormal jamming threshold to 15% of the preset value (e.g., for a zinc alloy door handle, the jamming alarm threshold = 8×1.15 = 9.2N·m); Durability Detection: Automatically stop for inspection of surface cracks (visual inspection + laser roughness analysis) when the number of cycles reaches 50,000 times; Reset Accuracy Verification: Measure the reset angle deviation through a laser sensor, and those with an out-of-tolerance (>1°) are marked as non-conforming products.

[0075] Classification Criteria: Qualified products (torque fluctuation <10%, reset deviation ≤1°), products for re-inspection (single parameter exceeding the limit), scrapped products (structural cracking or functional failure).

[0076] Data Closed-loop: Generate a correlation curve of torque - number of cycles - reset angle, which is used to optimize the mold design of the door handle in the future (e.g., when the torque dispersion of a certain batch is detected to be >12%, push mold correction suggestions).

[0077] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Quality inspection device for the product rotation structure, characterized in that It includes a power module and a transmission mechanism. The power module generates power and outputs at least two sets of rotational motions with opposite directions and synchronization through the transmission mechanism, driving the actuator to form an intermittent forward and reverse motion. The actuator includes an actuator shaft. One end of the actuator shaft is used to connect the fixture of the product to be measured, and the other end is provided with a driven sprocket. The outer circumference of the driven sprocket has at least four sets of uniformly distributed notches. Among them, two sets of notches at a set angle are respectively engaged with the corresponding driving dial. Driven by the transmission mechanism, the driving dial alternately engages with the driven sprocket, driving the driven sprocket together with the actuator shaft to form an intermittent forward and reverse motion, and outputting through the actuator shaft.

2. The quality inspection device for the product rotation structure according to claim 1, characterized in that, The outer circumference of the driven sprocket has notches, and the notches include paired transmission grooves and corresponding locking arcs, and the indexing angle formed by the locking arcs θ = 360° / n, where n≥4 and n is an even number.

3. The quality inspection device for the product rotation structure according to claim 1, characterized in that, The driving 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 surface is provided with a pin shaft. When the driving dial engages with the driven sprocket, the pin shaft engages with the transmission groove, and the dial frame engages with the locking arc.

4. The quality inspection device for the product rotation structure according to claim 1, characterized in that, The ratio between the rotational radius of the driving dial and the circumradius of the driven sprocket meets the set value.

5. The quality inspection device for the product rotation structure according to claim 1, characterized in that, The transmission mechanism includes a first-stage driving gear connected to the output shaft of the power module. The first-stage driving gear meshes with a first-stage driven gear. The first-stage driven gear rotates synchronously with at least two sets of second-stage driving gears. The second-stage driving gears mesh with the corresponding second-stage driven gears. The second-stage driven gears are connected to the corresponding output shafts. The motions of the two output shafts are opposite and synchronous.

6. The quality inspection device for the product rotation structure according to claim 5, characterized in that, The power module and the first-stage driving gear are arranged coaxially. The rotational axes of the first-stage driving gear and the first-stage driven gear are arranged side by side. The first-stage driven gear and the second-stage driving gears are arranged coaxially. And the second-stage driving gears are arranged on both sides of the first-stage driven gear. The rotational axes of the second-stage driving gears and the corresponding second-stage driven gears are perpendicular.

7. The quality inspection device for the product rotation structure according to claim 1, characterized in that, The actuator is located on one side of the housing. The driving dials therein are connected to the corresponding output shafts through fixed blocks. The output shafts drive the two driving dials to perform rotational motions with opposite directions and synchronization.

8. The quality inspection device for the product rotation structure according to claim 1, characterized in that, It also has a torque sensor, a Hall sensor, and a displacement sensor. The torque sensor is used to obtain the torque during the rotation of the output shaft. The Hall sensor is used to obtain the number of cycles of the intermittent forward and reverse motion of the actuator shaft. The displacement sensor is used to obtain the displacement change during the intermittent forward and reverse motion of the actuator shaft.

9. The quality inspection device for the product rotation structure according to claim 1, characterized in that The power module and the transmission mechanism are located inside the housing. The housing includes an upper end cover and a box base. The top of the upper end cover is provided with an observation window. The observation window is connected to a transparent window plate. The upper end cover and the box base are connected through a box flange.

10. A quality inspection method for the product rotation structure, implemented based on the quality inspection device according to any one of claims 1-9, characterized in that, It includes the following steps: According to the test requirements of the product to be measured, determine the time for the rotary structure to complete one intermittent forward and reverse motion, and combine with the speed ratio of the transmission mechanism to set the output speed of the power module. Connect the actuator shaft and the product to be measured through the fixture, control the operation of the power module according to the set speed. The power module drives the product to be measured to form an intermittent forward and reverse motion through the transmission mechanism and the actuator, that is, a motion cycle of forward rotation - pause - reverse rotation - pause. By obtaining the torque of the output shaft, monitor the torque fluctuation during the intermittent forward and reverse motion to achieve the test of rotational flexibility. Obtain the cycle count of the intermittent forward and reverse motion until the set threshold is reached or cracks or functional failures occur in the product under test, to achieve the structural durability test; After detecting the intermittent pause, obtain the angular change or displacement change of the rotary structure to verify the reset accuracy of the rotary structure.

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