Method for synchronous detection of running belt strength balance and surface defects of a treadmill

Abstract

The application belongs to the technical field of treadmill testing methods, and discloses a treadmill running belt strength balance and surface defect synchronous detection method. When the running belt is relaxed due to material fatigue, the balance linkage mechanism on the relaxed side automatically responds and drives the corresponding side movable tensioning roller to move downward to re-tension the running belt. The synchronous detection structure obtains the motion information of the two balance linkage mechanisms in real time to calculate the running belt deformation. The silk detection mechanism is arranged across the two sides of the running belt. The displacement detection assembly monitors the displacement change of the silk in real time. When the running belt surface has defects such as cracks and fiber pulling out, the silk is touched or hooked to produce measurable displacement change. A three-level alarm mechanism is established to identify defects. The application realizes synchronous detection of the material strength durability and the bilateral strength balance of the running belt, can accurately identify the unevenness of the material fatigue strength attenuation of the two sides of the running belt, and realizes real-time monitoring of the surface micro-defects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fitness equipment detection, in particular to a treadmill running belt strength balance and surface defect synchronous detection method, especially for the real-time detection technology of the material strength durability, bilateral strength balance and surface micro-defects of the treadmill running belt. BACKGROUND

[0002] In the production process of the treadmill, comprehensive detection of the performance of the running belt is a key link to ensure product quality.

[0003] At present, the detection technology of the treadmill running belt mainly focuses on the testing of a single performance index. For example, Chinese patent CN104535245B discloses a running belt static elongation testing method in a running belt tension testing device, which comprises a rack, a workbench plate, a roller one and a roller two. The tension of the running belt is detected by a force sensor, and the elongation of the running belt is detected by the moving distance of a displacement pointer. The technical solution can effectively test the static elongation of the running belt, but it can only detect the tension and elongation performance of the running belt, and cannot realize the synchronous monitoring of the strength durability and bilateral balance of the running belt.

[0004] Chinese patent CN201120556159.3 discloses a treadmill durability testing machine. The device tests the running belt by impact testing through an impact wheel, which is mainly used for testing the use durability of the running belt. However, this technical solution can only test the use durability of the running belt, and cannot test the balance of the strength of the two sides of the running belt, nor can it identify the micro-defects on the surface of the running belt.

[0005] The existing technology has the following shortcomings: first, there is a lack of detection means for the bilateral strength balance of the running belt. In actual use, the stress on both sides of the running belt is often uneven, resulting in differences in material fatigue degree, and unilateral relaxation phenomenon often occurs, but the existing detection method cannot accurately identify and quantify this imbalance. Secondly, the existing technology cannot realize real-time monitoring of the micro-defects on the surface of the running belt. The running belt is prone to surface cracks, fiber pull-out, abnormal joints and other micro-defects during use. Although these defects are small, they can affect the overall strength and use safety of the running belt, and the existing detection equipment cannot find such problems. Thirdly, the existing detection method is mainly for single index testing, and cannot realize synchronous detection of multiple performance indexes, which is low in detection efficiency and cannot meet the needs of rapid and comprehensive quality control in the production process.

[0006] Therefore, it is urgent to develop a detection method that can simultaneously detect the strength balance and surface defects of the running belt of the treadmill, so as to realize comprehensive evaluation and real-time monitoring of the quality of the running belt. SUMMARY

[0007] The application aims to provide a treadmill belt durability and bilateral strength balance detection method and a treadmill belt surface defect real-time detection method to solve the technical problems that the prior art cannot simultaneously detect the strength durability and bilateral strength balance of the belt material and cannot monitor the small defects on the belt surface in real time.

[0008] To achieve the above-mentioned purpose, the application adopts the following technical solutions:

[0009] Technical solution one:

[0010] The application provides a treadmill belt strength balance detection method, which comprises the following steps:

[0011] Step one: continuously running the belt to be tested on a running driving device comprising a driving roller and a driven roller;

[0012] Step two: monitoring the bilateral strength of the running belt by a synchronous testing device, the synchronous testing device comprising a tension roller assembly, two balance linkage mechanisms and a synchronous detection structure, the tension roller assembly comprising a movable tension roller at the middle position and fixed tension rollers at both sides, the two balance linkage mechanisms being respectively arranged at both ends of the tension roller assembly and being movably connected with the movable tension rollers at the corresponding sides, and the synchronous detection structure being linked between the two balance linkage mechanisms and being used to simultaneously obtain the movement information of the two balance linkage mechanisms to calculate the deformation of the belt, when the belt relaxes due to material fatigue, the balance linkage mechanism at the relaxation side automatically responds and drives the movable tension roller at the corresponding side to move downward to re-tension the belt.

[0013] Preferably, the test time of the continuous running in step one is 8-12 hours, and the initial tensioning force is controlled at 80-90% of the rated tensioning force of the belt.

[0014] Further preferably, at the initial stage of the continuous running in step one, a vibration and edge lifting detection mechanism is arranged to detect the running stability of the belt to be tested, the vibration and edge lifting detection mechanism comprising two detection frames symmetrically arranged at both sides of the belt, the detection frame comprising a detection frame body in a frame structure and a plurality of brushes distributed at the side edges of the detection frame body, the detection frame body being a support structure used to support the brushes and fix the position of the entire detection frame, the edge of the belt being embedded between the brushes, and the running stability of the belt being judged by observing the deformation degree of the brushes.

[0015] Further preferably, the balance linkage mechanism adopts a compound structure of unequal-diameter-lever, including an integrated shaft support with a limiting sliding groove, a lever linkage assembly and a force control assembly, the lever linkage assembly includes an unequal-diameter balance as a lever, the unequal-diameter balance includes a force arm rod and an unequal-diameter wheel, the unequal-diameter wheel is offsetly hinged with a hinged shaft as a lever fulcrum, the hinged shaft is slidingly connected in the limiting sliding groove of the integrated shaft support, and the unequal-diameter wheel is connected with the movable tensioning roller through a connecting rod.

[0016] As a specific embodiment, the force control assembly includes a steel wire rope and a constant force output device, one end of the steel wire rope is connected to the unequal-diameter balance, and the other end is wound on the constant force output device.

[0017] As another specific embodiment, the synchronous detection structure includes a horizontal frame, a horizontal support box and a measuring instrument, the horizontal frame passes through the steel wire rope at both ends and is arranged at the upper end of the horizontal support box, the horizontal support box is slidingly and fixedly penetrated through the steel wire rope, and a displacement sensor is installed in the horizontal support box, and the measuring instrument is installed at the middle position of the upper end of the horizontal frame.

[0018] Specifically, the method for detecting the vibration and edge lifting detection mechanism in cooperation with the synchronous testing device is as follows: the slackness of the running belt at both sides is monitored through the detection frame, when the slackness is detected, the force control assembly receives the signal to start the constant force output device, the unequal-diameter balance is driven to rotate through the steel wire rope, the movable tensioning roller is driven to move downward to re-tension the running belt, and the synchronous detection structure records the motion parameters in real time to realize the bilateral strength balance detection.

[0019] Technical solution two:

[0020] The application also provides a synchronous detection method for surface defects of a running belt of a treadmill, and the method comprises the following steps:

[0021] Step one: the running stability of the running belt in operation is detected through the vibration and edge lifting detection mechanism, the vibration and edge lifting detection mechanism includes two detection frames symmetrically installed on both sides of the running belt;

[0022] Step two: a silk thread is horizontally arranged on both sides of the running belt in operation, and the silk thread is in slight contact with the surface of the running belt;

[0023] Step three: the displacement change of the silk thread is monitored in real time through the displacement detection assembly;

[0024] The vibration and edge lifting detection mechanism comprises two symmetrical detection frames installed on both sides of the running belt, the detection frame comprises a detection frame body and a plurality of brushes distributed on the side edges of the detection frame body, the edge of the running belt is embedded between the brushes, and the brushes are used for detecting the large-scale edge lifting deformation of the running belt edge.

[0025] Preferably, the wire is selected from nylon wire or carbon fiber wire with a diameter of 0.1-0.2 mm.

[0026] Further preferably, a three-level alarm mechanism is established for defect identification, including a yellow indicator light, an orange indicator light and a red indicator light, wherein the triggering condition of the first-level alarm is that the wire displacement is greater than 20 mm and the duration is more than 2 seconds but the displacement speed is less than 2 mm / s, the yellow indicator light is lit, the triggering condition of the second-level alarm is that the wire displacement is greater than 40 mm or the displacement speed is greater than 5 mm / s, the orange indicator light flashes, and the triggering condition of the third-level alarm is that the wire displacement is greater than 60 mm or the displacement speed is greater than 10 mm / s, the red indicator light is always on.

[0027] Beneficial effects:

[0028] Compared with the prior art, the running belt material strength durability and bilateral strength balance are simultaneously detected by the synchronous testing device, the non-uniformity of the fatigue strength attenuation of the materials on both sides of the running belt can be accurately identified, and the comprehensiveness and accuracy of the detection are improved; the balance linkage mechanism with unequal-diameter-lever composite structure can independently respond to the relaxation conditions on both sides of the running belt, and accurately measure the deformation amount of the running belt through mechanical transmission, thereby improving the test precision; the wire detection mechanism realizes real-time monitoring of the small defects on the surface of the running belt, can detect the microscopic defects such as surface cracks and fiber pull-out which affect the overall strength of the running belt, and fills the gap in the detection of surface defects in the prior art; a three-level alarm mechanism is established, different processing strategies can be taken according to the severity of the defects, and the intelligent level and safety of the detection system are improved; through the complementary detection of the brushes and the wire, all defect types from small defects to obvious deformations are covered, and the overall monitoring of the quality of the running belt is realized. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 Overall flow chart for the raceway detection system;

[0030] Figure 2 Flow chart for raceway installation and commissioning;

[0031] Figure 3 Flow chart for parameter setting and calibration;

[0032] Figure 4 Flow chart for the thread detection mechanism commissioning;

[0033] Figure 5 Structure diagram of the thread detection mechanism;

[0034] Figure 6 Structure diagram of the basic test tool;

[0035] Figure 7 Structure diagram of part of the raceway when not installed;

[0036] Figure 8 Structure diagram of the synchronization test device;

[0037] Figure 9 Structure diagram of the balancing linkage;

[0038] Figure 10 Structure diagram of the raceway test initial;

[0039] Figure 11 Structure diagram of the raceway test steel wire rope pulled to the limit;

[0040] Figure 12 Figure 6 Detail view of the portion I;

[0041] Figure 13 Structure diagram of the synchronization test device improved structure.

[0042] Reference signs:

[0043] ​Running belt 01, test workbench 10, running driving device 20, size adjusting device 30, tensioning stabilizing structure 40, synchronous test device 50, vibration and edge lifting detection mechanism 60, control cabinet 70, first mounting plate 11, second mounting plate 12, driving motor 21, synchronous belt 22, driving roller 23, driven roller 24, end frame 25, length adjusting structure 31, width adjusting structure 32, connecting plate frame 41, stabilizing assembly 42, tensioning roller assembly 51, balance linkage mechanism 52, synchronous detection structure 53, detection frame 61, bracket 612, brush 613, sliding guide rail 311, guide sliding groove 321, movable tensioning roller 511, fixed tensioning roller 512, integrated shaft frame 521, lever linkage assembly 522, force control assembly 523, horizontal frame 531, horizontal support box 532, measuring instrument 533, top plate 5211, unequal diameter balancing piece 5221, force arm lever 5222, unequal diameter wheel 5223, hinged shaft 5224, limiting sliding groove 5225, sliding sleeve 5226, steel wire rope 5231, constant force outputter 5232, convex part 02. Thread detection mechanism 80, spring tensioner 81, housing 811, coil spring 812, tensioning force adjusting hole 813, thread 82, displacement detection assembly 83, laser displacement sensor 831. DETAILED DESCRIPTION

[0044] The present application provides a kind of running machine running belt's durability and bilateral strength balance test tool, it simulates running machine running belt 01 after a certain time of operation using prior art, the durability of running belt is detected by testing the deformation degree and material relaxation strength of running belt, while the difference of tensioning strength of both sides of running belt under the same operating condition, material fatigue strength attenuation inhomogeneity is obtained by specific structure design and is compared and analyzed, the change of material wrapping support force of both sides of running belt, the degree of loss of elastic recovery strength and the strength balance symmetry of left and right sides are monitored, the real-time monitoring of small defect on the surface of running belt is carried out by cooperating with thread detection mechanism, so that the material strength durability and bilateral strength balance detection of running belt are realized simultaneously, and surface crack, fiber pull-out and other micro defects that affect the overall strength of running belt can be identified.

[0045] Example 1, basic test tool:

[0046] Referring to the accompanying drawings Figures 6-7 The present embodiment provides a kind of running machine running belt's strength and balance test tool, comprising:

[0047] Test workbench 10 is used as the supporting installation table of the present test tool, and the following devices are installed on test workbench 10;

[0048] The running driving device 20 is used to simulate the running of a treadmill, which comprises a driving motor 21, a synchronous belt 22, a driving roller 23, a driven roller 24, a running belt installed on the driving roller 23 and the driven roller 24, and the synchronous belt 22 is connected in transmission between the output end of the driving motor 21 and the driving roller 23, so as to simulate the actual use state of the running belt by continuous running;

[0049] The size adjusting device 30 is connected with the driving roller 23 and the driven roller 24, and comprises a length adjusting structure 31 and a width adjusting structure 32, so as to be suitable for installing running belts with different lengths and widths, and to ensure that the running belts with different material thicknesses and fiber densities can obtain appropriate pre-tension;

[0050] The tension stabilizing structure 40 is arranged along the length direction of the running belt, and is used to ensure the stable running of the running belt, reduce the loosening of the running belt caused by vibration, maintain the stability of the material stress state, and improve the measurement accuracy;

[0051] The synchronous testing device 50 is the core innovative part of the test tool, and refers to Figure 3 , which comprises a tension roller assembly 51 for transmitting the deformation effect of the running belt, two balance linkage mechanisms 52 for converting the deformation amount of the running belt to facilitate measurement, and a synchronous detection structure 53 for displaying the detection result.

[0052] The vibration and edge lifting detection mechanism 60 comprises two detection frames 61 symmetrically installed on both sides of the running belt, and is used to amplify the vibration amplitude and vibration frequency of the running belt during the initial installation of the running belt, so as to facilitate the observation of whether the running belt runs stably and determine the timing of starting the formal test of the running belt.

[0053] Detailed structure of the synchronous testing device:

[0054] Referring to Figure 8 , the tension roller assembly 51 comprises a plurality of tension rollers, preferably three tension rollers in this embodiment, and is distributed in the shape of an inverted isosceles triangle, which comprises a movable tension roller 511 located in the middle position and two fixed tension rollers 512 located on both sides. The running belt passes through the three tension rollers in sequence and is wrapped around the lower half curved surface of the movable tension roller 511 (for reference Figure 8 );

[0055] Two balance linkage mechanisms 52 are arranged at both ends of the tension roller assembly 51, each of which is fixedly connected with the end of the fixed tension roller 512 on the corresponding side and movably connected with the end of the movable tension roller 511 on the corresponding side, that is, the balance linkage mechanism 52 is independently adjustable up and down for the movable tension roller 511 on both sides, and when the running belt material relaxation intensity decreases (the relaxation intensity is usually not balanced on both sides), the running belt operation can be restored to the expected balance by adjusting the up and down movement of the movable tension roller 511 on one side, so that the running belt is re-tensioned to the set stress level.

[0056] The synchronous detection structure 53 is linked between the two balance linkage mechanisms 52, and the movement information of the two balance linkage mechanisms 52 can be obtained at the same time to calculate the deformation of the running belt.

[0057] The test principle of the synchronous test device 50 is as follows:

[0058] During operation, the running belt will relax due to material fatigue and decrease in intensity, and the wrapping support force of the movable tension roller 511 will decrease. Since the material fatigue degree on both sides of the running belt usually differs, the relaxation phenomenon often occurs asymmetrically. At this time, the two independent balance linkage mechanisms 52 can respond to the relaxation on the corresponding side respectively, and drive the movable tension roller 511 on the corresponding side to independently move downward through the respective force control assembly 523, so as to re-press the running belt at the corresponding position and restore the tension state of the running belt. The synchronous detection structure 53 monitors the movement parameters of the two balance linkage mechanisms 52 in real time, including the displacement, rotation angle, movement time and other information of each mechanism, compares and analyzes the movement differences of the two mechanisms from the beginning of the test to the end of the test, obtains the imbalance amplitude of the material intensity on both sides of the running belt, and evaluates the intensity difference on both sides of the running belt. At the same time, the movement trajectories, response speeds and final positions of the two balance linkage mechanisms 52 are compared and analyzed, and the intensity balance symmetry of the running belt on both sides under the same operation condition is quantitatively obtained, so as to ensure the accuracy and reliability of the test results.

[0059] Specifically, the balance linkage mechanism 52 adopts an unequal-diameter-lever composite structure, which can refer to Figures 9-13 , including:

[0060] The integrated shaft stand 521 is connected to the upper end of the workbench plate and serves as an integrated mounting member for other components in the mechanism, and is fixedly connected with the fixed tension roller 512;

[0061] The lever linkage assembly 522 is the core component of the mechanism, including an unequal-diameter balance member 5221 as a lever, which is symmetrically arranged on both sides of the integrated shaft stand 521 (as shown in Figure 4 , including a force arm 5222 and an unequal-diameter wheel 5223 (as shown in Figure 5As shown), the upper end of the unequal diameter wheel 5223 abuts against the top plate 5211 of the integrated shaft frame 521, and is offsetly hinged to a hinge shaft 5224 serving as a lever fulcrum. The hinge shaft 5224 is slidably connected within the limiting groove 5225 of the integrated shaft frame 521 (as shown). Figure 5 As shown in the figure), it is also connected to the movable tension roller 511 via a connecting rod (the connecting rod is not shown in the figure), which can be referenced. Figure 5 At the beginning of the running belt test, the hinge shaft 5224 is located at the top of the limiting groove 5225. The end of the unequal diameter wheel 5223 that is shorter than the center of the hinge shaft abuts against the top plate 5211. As the lever arm 5222 rotates downward, the distance between the end of the unequal diameter wheel 5223 that abuts against the top plate 5211 and the center of the hinge shaft 5224 increases linearly.

[0062] Force control component 523 is provided at the lower end of each lever arm 5222, and is used to independently apply a preset external force to the corresponding side unequal diameter balance component 5221, drive the unequal diameter wheel 5223 to rotate, thereby driving the corresponding side movable tension roller 511 to move down.

[0063] In this embodiment, reference Figure 9 The force control component 523 can be achieved by using a steel wire rope 5231, with one end connected to the unequal diameter balancer 5221 and the other end wound around the constant force output device 5232 that can provide a constant external force. The constant force output device 5232 can be a servo winch, magnetic powder brake, torque motor, etc.

[0064] refer to Figure 12 As a structural variation, the lever linkage assembly 522 can also be designed with improvements: the shape of the unequal diameter wheels 5223 is slightly modified, and the limiting groove 5225 is removed (e.g., Figure 8 As shown in the figure, the unequal diameter wheel 5223 can only rotate via the hinge shaft 5224. The protrusion 02 of the unequal diameter wheel 5223 allows it to push the movable tension roller 511 downwards via the sliding sleeve 5226 during rotation. To ensure the movable tension roller 511 returns to its original position during repeated testing, a return spring (not shown in the figure) is connected to the upper end of the sliding sleeve 5226. Therefore, when the external force of the force control component 523 is adjusted to disengage the unequal diameter balancer 5221 from the sliding sleeve 5226, the sliding sleeve 5226 can drive the movable tension roller 511 upwards to its original position via the return spring.

[0065] Compared to the standard structure, which directly controls the downward movement or return of the movable tension roller 511 by adjusting the stable tension of the wire rope 5231, the improved structure uses the protrusion 02 of the unequal diameter wheel 5223 to push the movable tension roller 511 downward, and then uses the elastic force of the return spring to return it to its original position. This design can more accurately control the elastic recovery force of the detection running belt material.

[0066] To ensure that the movable tension roller 511 can move stably under the driving of the connecting rod, and avoid shaking or deviation during the running of the belt, which affects the accuracy of the test. Referring to Figure 4 , the end of the movable tension roller 511 is sleeved with a sliding sleeve 5226, which is connected with the integrated shaft stand 521 in sliding mode.

[0067] The whole test process of the balance linkage mechanism 52 is as follows: the vibration and edge detection mechanism 60, the synchronous detection structure 53 cooperate with each other. Figure 5 When the belt is installed initially, the size adjusting device 30, the synchronous belt 22, the tensioning and stabilizing structure 40, etc. may not be installed to the best position, resulting in a large vibration amplitude of the running belt, etc. At this time, the vibration and edge detection mechanism 60 can be used to monitor the stability of the running belt, and these structures are adjusted until the belt reaches a state that can start testing; After running stably, the synchronous detection structure 53 is adjusted to make the motion parameters on both sides of the belt consistent or negligible, ensuring the accuracy and reliability of the test results.

[0069] The two detection frames 61 of the vibration and edge detection mechanism 60 are continuously used to monitor the relaxation of the two sides of the belt. When one side is more relaxed, the wrapping support force of the belt on the movable tension roller 511 decreases, the moment of the two sides of the unequal diameter balancing piece 5221 is unbalanced, and the signal from the detection frame 61 is received by the force control assembly 523, so that the constant force outputter 5232 is started and the steel wire rope 5231 is wound. The force arm rod 5222 and the unequal diameter wheel 5223 are driven to rotate downward, so that the distance between the end of the unequal diameter wheel 5223 and the center of the hinge shaft 5224 increases, and the hinge shaft 5224 moves downward under the action of the transverse limiting and longitudinal guiding of the limiting sliding groove 5225, and drives the end of the movable tension roller 511 on this side to move downward independently to press the belt tightly, so that the belt is re-tensioned, and the moment of the two sides of the unequal diameter balancing piece 5221 is balanced again, and the constant force outputter 5232 stops moving.

[0070] The belt continues to run in a tensioned state for detection, and according to the above steps, the relaxation of the two sides of the belt is monitored and the corresponding movable tension roller 511 moves to re-tension the belt.

[0071] When the belt runs to the test time, it stops running. At this time, the rotation angle of the unequal diameter balancing piece 5221 or the height difference of a certain position of the steel wire rope 5231 can be measured by the synchronous detection structure 53, so as to indirectly measure the deformation amount of the two sides of the belt.

[0072] Referring to Figure 7The synchronous detection structure 53 includes a horizontal frame 531, both ends of which pass through the steel wire rope 5231 and are arranged at the upper end of the horizontal support box 532 (for reference Figure 5 The horizontal support box 532 is slidable and fixedly penetrates the steel wire rope 5231, and a displacement sensor (not shown in the figure) for monitoring the distance between the horizontal support box 532 and the constant force output device 5232 is arranged in the horizontal support box 532. A measuring instrument 533 is arranged at the middle position of the upper end of the horizontal frame 531, and the measuring instrument 533 can be a level or an angle instrument. When it is detected by the detection frame 61 that the running belt test can be started, the horizontal support boxes 532 on both sides and the horizontal frame are adjusted, so that the lower ends of the horizontal support boxes 532 on both sides are kept on the same horizontal plane, and the horizontal frame 531 is also kept in a horizontal state.

[0073] At the beginning of the running belt test, the same preset external force is provided by the force control assembly 523 on both sides, and the initial values of the displacement sensors on both sides and the measuring instrument 533 are recorded. When the running belt appears uneven relaxation, the steel wire rope 5231 pulls the unequal-diameter balancing piece 5221 to rotate, so that the horizontal support boxes 532 on both sides appear non-synchronous displacement changes, and the positions of the two ends of the horizontal frame 531 also change relative to the initial positions. At this time, the values of the displacement sensors on both sides and the value of the measuring instrument 533 are recorded, and the values are input into the computer system for calculation and analysis.

[0074] The multi-stage test is repeated, and one stage of the test content is the content described in the foregoing test principle process. When one stage of the test is completed and the running belt is irreversibly relaxed, the length adjusting structure 31 can be used to re-tension the loosened running belt, and the unequal-diameter balancing piece 5221 can be adjusted to return to the initial state in which the shorter end of the unequal-diameter balancing piece 5221 abuts against the top plate 5211. Then, one stage of the test is started again, and the analysis and calculation are performed, so as to improve the durability of the running belt on both sides and the accuracy and reliability of the balance of the running belt on both sides.

[0075] Reference Figure 12 The detection frame 61 includes a support 612 and a plurality of brushes 613 distributed on the side edges of the support 612. The edge of the running belt is embedded between the brushes 613. Whether the running belt can be tested can be judged by observing the up-down shaking degree of the brushes 613 and the deformation degree of the brushes 613.

[0076] Meanwhile, the detection frame 61 can also understand the edge curling of the running belt after a certain period of running according to the deformation degree.

[0077] The vibration and curling detection mechanism 60 can also be additionally provided with a capture camera (not shown in the figure) for high-definition shooting of the deformation degree of the brush, so as to improve the accurate judgment of the running state and the curling of the running belt.

[0078] To ensure the accuracy of the running belt test, the running belt needs to be in tension when installed, and to remain stable during operation. Referring to Figure 7 , the installation structure will be described in detail.

[0079] The running drive device 20, the driving roller 23, and the synchronous test device 50 are all installed on the test workbench 10 through the first mounting plate 11. The driven roller 24 and the detection frame 61 are both installed on the test workbench 10 through the second mounting plate 12. The driving roller 23 and the driven roller 24 are both detachably mounted with end frames 25 at both ends. The tensioning roller assembly 51 and the balance linkage mechanism 52 are detachably installed through threaded connection, so as to facilitate the wrapping installation of the running belt on the rollers.

[0080] The length adjustment structure 31 adjusts and tensions the running belt by moving one end of the driven roller 24, which includes a sliding guide rail 311 arranged on the test workbench 10, and the second mounting plate 12 is slidably mounted on the sliding guide rail 311, which can be driven by a motor or a pneumatic component or a hydraulic component.

[0081] The width adjustment structure 32 includes a plurality of guide sliding grooves 321, which are respectively slidably connected with one side of the driving roller 23, one side of the driven roller 24, and one side of the balance linkage mechanism 52, and are fixed by standard parts such as bolts or screws.

[0082] The tensioning and stabilizing structure 40 includes a connecting plate frame 41 slidably connected to the second mounting plate 12, and the driven roller 24 is mounted on the connecting plate frame 41. The connecting plate frame 41 is abutted with a stabilizing assembly 42 along the length direction of the running belt. The stabilizing assembly 42 can be abutted with one end of the bolt on the connecting plate frame 41, and the other end is threadedly connected to a fixed support block to achieve the connection.

[0083] Further, the stabilizing assembly 42 is provided with two groups, and the other group is abutted with the driving motor 21 along the length direction of the running belt. On the one hand, it can buffer a part of the motor vibration, improve the stability of the running belt operation, and on the other hand, it can cooperate with the driving motor 21 to improve the fixed drive after the driving motor 21 is slidably connected with the first mounting plate 11. Therefore, the tensioning degree of the synchronous belt 22 wound between the driving motor 21 and the driving roller 23 can be adjusted and kept stable, so as to ensure the stable power transmission of the driving motor 21 to the running belt.

[0084] The test tool is also equipped with a control cabinet 70, which can adjust the parameters of each electric component or hydraulic component or pneumatic component involved in the embodiment.

[0085] Embodiment 2: Treadmill running belt test tool integrated with wire detection mechanism

[0086] Referring to Figures 1-5The embodiment is extended based on embodiment 1, and a wire detection mechanism 80 is set for the existing test tool to detect the small defects on the surface of the running belt. The mechanism uses wire as the triggering medium, combines displacement sensing and signal processing, and can monitor the small defects such as small cracks, fiber pull-out, and abnormal joint of the running belt surface in real time.

[0087] The wire detection mechanism 80 is integrated in the existing vibration and edge lifting detection mechanism 60, and the wire across the two sides of the running belt is in slight contact with the surface of the running belt. When the surface of the running belt has small protrusions, cracks, or fiber pull-out, the wire will be touched or hooked, and a measurable displacement change will be generated. The whole detection uses non-contact laser measurement or visual detection measurement, which will not interfere with the normal operation of the running belt, and is equipped with a hierarchical alarm mechanism and an automatic protection function (the wire will be automatically disconnected when the displacement is too large).

[0088] Structural components: the wire detection mechanism 80 includes: a spring tensioner 81 fixed on each vibration and edge lifting detection mechanism 60, a wire 82 as a detection medium, and a displacement detection assembly 83 for monitoring the displacement of the wire 82.

[0089] The spring tensioner 81 is located on both sides of the running belt, and one or two are provided on each side, that is, one set. The spring tensioner 81 includes a shell 811 fixedly connected with the vibration and edge lifting detection mechanism 60 and a coil spring 812 installed in the shell 811. The effective number of turns of the coil spring 812 is, for example, 20 turns, the free end of the coil spring 812 is exposed to the shell 811 and is connected with one end of the wire 82 respectively, and the coil spring 812 provides a basic tension for the wire 82 through the elastic restoring force. The shell 811 can be made of aluminum alloy material, the inner surface is treated by anodic oxidation to reduce friction, and the shell 811 is provided with a tension adjusting hole 813. By adjusting the screw in the tension adjusting hole 813, the pre-compression amount of the coil spring 812 can be changed, so that the size of the output tension can be adjusted.

[0090] The wire 82, for example, uses nylon wire or carbon fiber wire with a diameter of 0.1-0.2 mm, and the selected wire needs to have the characteristics of high strength, low elongation, and wear resistance. The wire 82 crosses the two sides of the running belt, and the two ends are connected to the corresponding spring tensioners 81. During the running of the running belt, the wire 82 is in slight contact or a small gap of 1-2 mm with the surface of the running belt. When the surface of the running belt has defects, the wire 82 is touched or hooked, so that it deviates from the original position and generates a measurable displacement change. The elastic property of the spring tensioner 81 makes the wire 82 quickly return to the original position after slight contact, that is, when the defect is not serious, the detection continues.

[0091] The displacement detection assembly 83 uses a laser displacement sensor 831, the measurement range is ±10 mm, the accuracy is ±0.1 mm, and the response frequency is 2 kHz. The sensor is fixed on the detection frame 61 through an adjustable support.

[0092] Further, a mechanism can be provided to cut the wire when it is displaced too much. For example, by providing an electromagnetic cutter or a thermal cutting device at the appropriate place to quickly cut the wire, or a magnetic attraction structure as an alternative solution, which automatically disconnects when the displacement exceeds the limit. To protect the equipment from damage caused by wire entanglement or dragging, and to ensure the safe operation of the test device.

[0093] Detection principle and data analysis algorithm:

[0094] The working principle of the wire detection mechanism is based on a composite detection mode of physical contact triggering and displacement measurement. When a crack appears on the running belt surface, the edge of the crack will hook the wire and produce a forward dragging force, causing the wire to deviate from the standard position; when the running belt fiber is pulled out, the pulled-out fiber will entangle the wire and move it; when the joint has defects such as burrs and protrusions, it will directly touch the wire and cause displacement; these changes will be captured by laser displacement sensors or visual monitoring. The system identifies the defect type by analyzing the time characteristics of the displacement: instantaneous displacement (duration <1 second) usually indicates the passage of one-time defects such as small particles and burrs; continuous displacement (duration >5 seconds) indicates continuous defects or serious damage such as long cracks and large area wear; displacement speed reflects the severity of the defect, the faster the speed, the more prominent the defect; displacement frequency can be used to analyze the distribution of defects, and high-frequency repetitive displacement may indicate that the running belt surface has periodic defects.

[0095] The data analysis algorithm uses multi-dimensional feature extraction technology, combining displacement amplitude, duration, change speed, frequency characteristics and other parameters to establish a defect recognition model. The system performs digital filtering on the original displacement signal to remove high-frequency noise and environmental interference, identifies displacement events through peak detection algorithm and calculates feature parameters. Trend analysis algorithm statistically analyzes the data of continuous detection period to identify the quality change trend of the running belt. The system has self-adaptive function, which can automatically adjust the detection threshold and alarm parameters according to the characteristics of different types of running belts.

[0096] The system establishes a three-level alarm mechanism, which adopts different processing strategies according to the severity of the defect. The first level alarm is for minor defects, the trigger condition is that the wire displacement is greater than 20mm and the duration is more than 2 seconds, but the displacement speed is less than 2mm / s. When triggered, the yellow indicator light is lit and a short beep is emitted once, the defect position and data are recorded, and the sampling frequency is increased to 5kHz, but it does not affect the normal operation of the running belt.

[0097] The secondary alarm is triggered when the wire displacement is greater than 40 mm or the displacement speed is greater than 5 mm / s, or the first alarm occurs more than 3 times in succession, or the displacement duration exceeds 5 seconds. When triggered, the orange indicator light flashes and emits 3 continuous beeps, automatically reduces the running speed of the running belt to 50%, starts the image recording function, and sends an alarm message to the monitoring system.

[0098] The tertiary alarm is triggered when the wire displacement is greater than 60 mm, the continuous movement time exceeds 10 seconds, the displacement speed is greater than 10 mm / s, or the wire breakage is detected. When triggered, the red indicator light is always on and emits a long beep, automatically stops the running of the running belt, decides to start the reset program or the emergency shutdown program according to the displacement size, sends an emergency alarm message to the management system, and locks the test state to wait for manual intervention.

[0099] The integration design of the wire detection mechanism 80 with the existing test tool fully considers the structural compatibility and functional complementarity. In terms of structural integration, the wire detection mechanism utilizes the existing detection frame 61 structure of the vibration and edge detection mechanism 60, and is fixedly installed through the reserved mounting hole, and is complementary with the existing brush 613 in function: the brush 613 detects large-scale edge deformation (greater than 5 mm), and the wire detection mechanism detects small defects (in the range of 1-5 mm), and the two systems cover all defect types from small to obvious.

[0100] In terms of control system integration, the signal processing component 84 of the wire detection mechanism is integrated into the existing control cabinet 70.

[0101] Embodiment 3: Treadmill running belt strength durability test method

[0102] This embodiment is based on the test tool of the aforementioned embodiments 1 and 2, and provides a systematic treadmill running belt strength durability test method, which realizes comprehensive evaluation of the strength characteristics of the running belt material and accurate detection of the bilateral balance through standardized test procedures, parameter settings and data analysis.

[0103] Preparation stage before test:

[0104] Tread belt installation and commissioning: according to the size of the measured tread belt, adjust the transverse position of the driving roller 23, the driven roller 24 and the balance linkage mechanism 52 through the width adjustment structure 32 to ensure that the tread belt can be correctly wrapped around each roller shaft; install the tread belt on the driving roller 23, the driven roller 24 and the tensioning roller assembly 51 in turn, ensure that the tread belt is correctly oriented and has no distortion; adjust the position of the driven roller 24 through the length adjustment structure 31 to make the tread belt reach the initial tensioning state, and the initial tensioning force should be controlled at 80-90% of the rated tensioning force of the tread belt; start the running driving device 20 to run at low speed (0.5-1.0 m / s) for 5-10 minutes, observe the running stability of the tread belt, and judge whether the tread belt runs stably through the deformation of the brush 613 of the vibration and edge detection mechanism 60.

[0105] Test parameter setting:

[0106] Set the running speed according to the type and thickness of the tread belt: set the thin tread belt (thickness ≤3mm) to 3-5m / s, and set the thick tread belt (thickness >3mm) to 2-4m / s; set the test running time: the standard test is continuous running for 8-12 hours, and the accelerated aging test is continuous running for 24-48 hours; adjust the force control assembly 523 of the balance linkage mechanism 52, set the preset external force to 1.2-1.5 times the weight of the tread belt, to ensure that the material strength change can be detected sensitively; calibrate the measuring instrument 533 and the displacement sensor of the synchronous detection structure 53, and record the initial reference value.

[0107] Yarn detection mechanism debugging:

[0108] Adjust the tensioning force of the spring tensioner 81 to 2-4N to ensure that the yarn 82 maintains a small gap of 1-2mm with the surface of the tread belt; calibrate the measurement zero point of the laser displacement sensor 831, set the detection threshold: first alarm, second alarm, third alarm; test the response time of the third alarm mechanism and the reliability of the reset function.

[0109] Standard strength durability test process:

[0110] First stage: basic strength detection (0-2 hours);

[0111] Start the test tool, the tread belt runs stably at the set speed, record the position parameters of the balance linkage mechanism 52 on both sides in the initial state; record the data of the synchronous detection structure 53 every 30 minutes, including the inclination angle of the horizontal frame 531 and the values of the displacement sensors on both sides; real-time monitor the alarm situation of the yarn detection mechanism 80, record the frequency and position distribution of the first alarm; observe the deformation of the tread belt edge through the vibration and edge detection mechanism 60, and record the deformation degree of the brush 613.

[0112] Second stage: fatigue strength monitoring (2-8 hours);

[0113] Continue running the test, focusing on monitoring the movement changes of the two-sided balance linkage mechanism 52. When the running belt material fatigues and causes relaxation, the corresponding side of the movable tension roller 511 will move downward. Record the rotational angle changes of the unequal-diameter balancing piece 5221 every hour to analyze the differences in material fatigue strength decay on both sides. Monitor the trend of the wrapping support force. When the support force decreases by more than 10% of the initial value, it indicates that the material strength has started to significantly decay. Count the alarm escalation of the wire detection mechanism. An increase in the frequency of first-level alarms indicates an increase in surface defects, and the appearance of second-level alarms indicates an increase in defect severity.

[0114] Phase III: Strength Balance Analysis (8-12 hours)

[0115] Deeply analyze the movement data differences of the two-sided balance linkage mechanism 52 and calculate the strength asymmetry coefficient on both sides. Quantify the bilateral balance through the inclination of the horizontal frame 531. An inclination angle exceeding 2° indicates significant strength differences on both sides. Compare and analyze the alarm data of the wire detection mechanisms on both sides to evaluate the symmetry of surface defect distribution. Record the final material strength retention rate and bilateral balance rating.

[0116] Accelerated Aging Strength Test Process

[0117] High-strength operation settings: Increase the running speed to 1.5 times the normal test speed and increase the environmental temperature to 35-40°C (if possible). Adjust the preset external force of the force control assembly 523 to 1.3 times the normal value to simulate high-load usage conditions. Shorten the data recording interval to 15 minutes to increase the monitoring frequency.

[0118] Strength Decay Acceleration Evaluation

[0119] Focus on monitoring the strength change rate within the first 6 hours to establish a material fatigue curve. Stop the test immediately when the strength difference between both sides exceeds 15% or when the third-level alarm appears. Estimate the strength life of the running belt under normal usage conditions based on the accelerated aging data.

[0120] Strength Durability Evaluation Indexes

[0121] Material Strength Retention Rate: The ratio of the running belt tensioning strength at the end of the test to the initial strength. ≥85% is excellent, 70-85% is good, and <70% is unqualified.

[0122] Fatigue Strength Decay Rate: The rate of material strength decline per unit time. <2% / hour is excellent, 2-5% / hour is good, and >5% / hour is unqualified.

[0123] Elastic Recovery Strength: The degree of resilience retention when the running belt is re-tensioned after relaxation. ≥90% is excellent.

[0124] Bilateral strength balance evaluation index:

[0125] Left-right strength symmetry coefficient: | (left strength - right strength) / average strength | × 100%, <5% is excellent, 5-10% is good, >10% is unqualified;

[0126] Bilateral fatigue consistency: the difference between the fatigue decay rates of the two sides, <3% difference is excellent;

[0127] Surface defect symmetry distribution: the ratio of the number of defects on the left and right sides detected by the wire, 0.8-1.2 is the normal range.

[0128] Comprehensive evaluation level:

[0129] A level (excellent): both strength durability and bilateral balance reach excellent standards, no three-level alarm, suitable for high-end treadmills;

[0130] B level (good): main indicators reach good standards, may have a small amount of one or two level alarm, suitable for mid-end treadmills;

[0131] C level (qualified): basic indicators reach qualified standards, but there are some defects, suitable for entry-level treadmills;

[0132] D level (unqualified): key indicators do not meet the standards or have three-level alarms, not recommended for use.

[0133] Test report generation: automatically generate a standardized test report containing all test data, curve charts and evaluation conclusions; provide running belt strength trend chart, bilateral balance comparison chart and surface defect distribution chart; give the expected service life of the running belt and maintenance suggestions.

Claims

1. A method for testing the strength and balance of a treadmill running belt, the method comprising the following steps: Step 1: Install the running belt to be tested on the running drive device (20) including the driving roller (23) and the driven roller (24) for continuous operation; Step 2: The running treadmill is subjected to bilateral strength monitoring using a synchronous testing device (50), characterized in that: The synchronous testing device (50) includes a tension roller assembly (51), two balancing linkage mechanisms (52), and a synchronous detection structure (53). The tension roller assembly (51) includes a movable tension roller (511) located in the middle and fixed tension rollers (512) located on both sides. The two balancing linkage mechanisms (52) are respectively located at both ends of the tension roller assembly (51) and are movably connected to the movable tension roller (511) on the corresponding side. The synchronous detection structure (53) is linked between the two balancing linkage mechanisms (52) and is used to simultaneously obtain the motion information of the two balancing linkage mechanisms (52) to calculate the deformation of the running belt. When the running belt becomes loose due to material fatigue, the balancing linkage mechanism (52) on the loose side automatically responds and drives the movable tension roller (511) on the corresponding side to move down to re-tension the running belt. The continuous test time in step one is 8-12 hours, and the initial tension is controlled at 80-90% of the rated tension of the running belt; In the initial stage of continuous operation in step one, a vibration and edge warping detection mechanism (60) is set up to test the running stability of the running belt under test. The vibration and edge warping detection mechanism (60) includes two detection frames (61) symmetrically installed on both sides of the running belt. The detection frame (61) includes a frame structure support (612) and several brushes (613) distributed on the side of the support (612). The support (612) is a support structure used to support the brushes (613) and fix the position of the entire detection frame (61). The edge of the running belt is embedded between the brushes (613). The running belt running stability is judged by observing the degree of deformation of the brushes (613).

2. The method for testing the strength and balance of a treadmill running belt according to claim 1, characterized in that: The balancing linkage mechanism (52) adopts an unequal diameter-lever composite structure, including an integrated shaft frame (521) with a limiting groove (5225), a lever linkage assembly (522), and a force control assembly (523). The lever linkage assembly (522) includes an unequal diameter balancing component (5221) as a lever. The unequal diameter balancing component (5221) includes a lever arm (5222) and an unequal diameter wheel (5223). The unequal diameter wheel (5223) is offsetly hinged to a hinge shaft (5224) as a lever fulcrum. The hinge shaft (5224) is slidably connected in the limiting groove (5225) of the integrated shaft frame (521). The unequal diameter wheel (5223) is connected to the movable tension roller (511) through a connecting rod.

3. The method for testing the strength and balance of a treadmill running belt according to claim 2, characterized in that: The force control component (523) includes a wire rope (5231) and a constant force output device (5232). One end of the wire rope (5231) is connected to the unequal diameter balance member (5221), and the other end is wound around the constant force output device (5232).

4. The method for testing the strength and balance of a treadmill running belt according to claim 3, characterized in that: The synchronous detection structure (53) includes a horizontal frame (531), a horizontal support box (532), and a measuring instrument (533). The two ends of the horizontal frame (531) pass through steel wire ropes (5231) and are both placed on the upper end of the horizontal support box (532). The horizontal support box (532) is slidably and fixedly inserted through the steel wire ropes (5231) and has a displacement sensor installed inside. The measuring instrument (533) is installed at the middle position of the upper end of the horizontal frame (531).

5. The method for testing the strength and balance of a treadmill running belt according to claim 4, characterized in that: The vibration and warping detection mechanism (60) and the synchronous testing device (50) cooperate to perform the detection as follows: the detection frame (61) monitors the slack on both sides of the running belt. When slack is detected, the force control component (523) receives the signal and starts the constant force output device (5232). The wire rope (5231) drives the unequal diameter balance component (5221) to rotate, driving the movable tension roller (511) to move down and re-tension the running belt. The synchronous detection structure (53) records the motion parameters in real time to realize the strength balance detection on both sides.

6. A method for simultaneous detection of surface defects on a treadmill running belt, the method comprising the following steps: Step 1: The running stability of the running belt is tested by the vibration and warping detection mechanism (60); Step 2: Place the thread (82) across both sides of the running belt so that the thread (82) is in slight contact with the surface of the running belt; Step 3: The displacement change of the wire (82) is monitored in real time by the displacement detection component (83); Its features are: The vibration and warping detection mechanism (60) includes two detection frames (61) symmetrically installed on both sides of the running belt. Each detection frame (61) includes a support (612) and several brushes (613) distributed on the side of the support (612). The edge of the running belt is embedded between the brushes (613). The brushes (613) are used to detect large-scale warping deformation of the running belt edge. The filament (82) is a flexible filament structure, with its two ends connected to spring tensioners (81) set on both sides of the running belt. The spring tensioner (81) includes a spring element and a tension adjustment mechanism, which is used to provide constant tension to the filament (82). The tension force of the spring tensioner (81) is fixedly installed on the detection frame (61); the displacement detection component (83) includes a displacement sensor and a signal processing unit. The displacement sensor is connected to the wire (82) in contact or non-contact manner to monitor the displacement change of the wire (82) in real time. The signal processing unit amplifies, filters and digitizes the displacement signal. When a defect appears on the surface of the running belt, it touches or hooks the wire (82) to generate a measurable displacement change. The brush (613) and the wire (82) form complementary detection, covering all defect types from minor defects to obvious deformation.

7. The method for synchronous detection of surface defects on a treadmill running belt according to claim 6, characterized in that: The filament (82) is selected from nylon filament or carbon fiber filament with a diameter of 0.1-0.2 mm.

8. The method for synchronous detection of surface defects on a treadmill running belt according to any one of claims 6 to 7, characterized in that: A three-level alarm mechanism is established for defect identification, including yellow, orange, and red indicator lights. The trigger condition for a level 1 alarm is that the wire displacement is greater than 20mm and lasts for more than 2 seconds, but the displacement speed is less than 2mm / s, at which point the yellow indicator light will illuminate. The trigger condition for a level 2 alarm is that the wire displacement is greater than 40mm or the displacement speed is greater than 5mm / s, at which point the orange indicator light will flash. The trigger condition for a level 3 alarm is that the wire displacement is greater than 60mm or the displacement speed is greater than 10mm / s, at which point the red indicator light will remain constantly illuminated.

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