Synchronous detection method for strength balance and surface defects of running belt of running machine

Abstract

The invention belongs to the technical field of treadmill testing methods, and discloses a treadmill running belt strength balance and surface defect synchronous detection method, when a running belt is loosened due to material fatigue, a balance linkage mechanism on the loosened side automatically responds and drives a movable tensioning roller on the corresponding side to move downwards so as to tension the running belt again, so that the running belt is tensioned. The synchronous detection structure obtains motion information of the two balance linkage mechanisms in real time so as to calculate the deformation quantity of the running belt. The silk thread detection mechanism enables silk threads to stretch across the two sides of the running belt, the displacement change of the silk threads is monitored in real time through the displacement detection assembly, when defects such as cracks and fiber pulling-out occur on the surface of the running belt, measurable displacement change is generated by touching or hooking the silk threads, and a three-level alarm mechanism is established for defect recognition. According to the invention, synchronous detection of the strength durability of the running belt material and the strength balance of the two sides is realized, the nonuniformity of fatigue strength attenuation of the materials on the two sides of the running belt can be accurately identified, and meanwhile, real-time monitoring of surface tiny defects is realized.

Description

Technical Field

[0001] The present invention relates to the field of fitness equipment detection technology, and specifically to a method for synchronously detecting the strength balance and surface defects of a treadmill belt, especially a real-time detection technology for the strength and durability of treadmill belt materials, the bilateral strength balance, and minor surface defects. Background Art

[0002] During the production process of treadmills, comprehensive testing of the running belt performance is a key link in ensuring product quality.

[0003] Currently, treadmill belt testing technology primarily focuses on testing a single performance indicator. For example, Chinese patent CN104535245B discloses a method for testing the static elongation of a running belt in a running belt tension testing device. The device comprises a frame, a worktable, rollers one and two. A force sensor detects the tension of the running belt, and a displacement indicator measures the elongation of the running belt. This technical solution can effectively test the static elongation of the running belt, but it only tests the tension and elongation performance of the running belt, and cannot simultaneously monitor the strength, durability, and bilateral balance of the running belt.

[0004] Chinese patent CN201120556159.3 discloses a treadmill durability tester that uses an impact wheel to perform an impact test on a running belt, primarily for testing the belt's durability. However, this technical solution can only test the belt's durability; it cannot determine the strength balance between the two sides of the belt or identify minor surface defects.

[0005] The existing technology has the following deficiencies: First, there is a lack of means to detect the strength balance of both sides of the running belt. In actual use, the forces on both sides of the running belt are often uneven, resulting in differences in the degree of material fatigue, and unilateral relaxation often occurs, but the existing detection methods cannot accurately identify and quantify this imbalance. Secondly, the existing technology cannot achieve real-time monitoring of tiny defects on the surface of the running belt. During use, the running belt is prone to microscopic defects such as surface cracks, fiber pullout, and abnormal joints. Although these defects are small, they will affect the overall strength and safety of use of the running belt. It is difficult for existing detection equipment to detect such problems. Thirdly, the existing detection methods are mostly single-index tests, which cannot achieve simultaneous detection of multiple performance indicators. The detection efficiency is low and cannot meet the needs of rapid and comprehensive quality control in the production process.

[0006] Therefore, there is an urgent need to develop a detection method that can simultaneously detect the strength balance and surface defects of treadmill belts, so as to achieve comprehensive evaluation and real-time monitoring of the belt quality. Summary of the Invention

[0007] The purpose of the present invention is to provide a method for detecting the durability and bilateral strength balance of a treadmill belt and a real-time detection method for the surface defects of a treadmill belt, so as to solve the technical problems in the prior art that the strength durability and bilateral strength balance of the belt material cannot be detected synchronously, and that minor defects on the belt surface cannot be monitored in real time.

[0008] To achieve the above object, the present invention adopts the following technical solutions: Technical solution 1:

[0009] The present invention provides a treadmill belt strength balance detection method, the method comprising the following steps: Step 1: Install the running belt to be tested on a running drive device including a driving roller and a driven roller and run it continuously; Step 2: Perform bilateral strength monitoring on the running treadmill through a synchronous testing device, the synchronous testing device includes a tensioning roller assembly, two balancing linkage mechanisms and a synchronous detection structure, the tensioning roller assembly contains a movable tensioning roller located in the middle position and fixed tensioning rollers located on both sides, the two balancing linkage mechanisms are respectively arranged at both ends of the tensioning roller assembly and are movably connected to the movable tensioning rollers on the corresponding sides, the synchronous detection structure is linked between the two balancing linkage mechanisms, and is used to simultaneously obtain motion information of the two balancing linkage mechanisms to calculate the deformation of the treadmill, when the treadmill is loose due to material fatigue, the balancing linkage mechanism on the loose side automatically responds and drives the movable tensioning roller on the corresponding side to move downward to re-tighten the treadmill.

[0010] Preferably, the continuous running test time in step 1 is 8-12 hours, and the initial tension is controlled at 80-90% of the rated tension of the treadmill.

[0011] Further preferably, at the initial stage of continuous operation in step one, a vibration and warping detection mechanism is provided to detect the running stability of the running belt to be tested, the vibration and warping detection mechanism comprises two detection frames symmetrically installed on both sides of the running belt, the detection frame comprises a detection frame body in a frame structure and a plurality of brushes distributed on the sides of the detection frame body, the detection frame body is a supporting structure for carrying the brushes and fixing the position of the entire detection frame, the edge of the running belt is embedded between the brushes, and the running stability of the running belt is judged by observing the degree of deformation of the brushes.

[0012] Further preferably, the balancing linkage mechanism adopts an unequal diameter-lever composite structure, including an integrated axle frame with a limiting slide groove, a lever linkage assembly and a force control assembly, the lever linkage assembly includes an unequal diameter balancing piece as a lever, the unequal diameter balancing piece includes a force arm rod and an unequal diameter wheel, the unequal diameter wheel is offset and hinged with a hinge shaft as a lever fulcrum, the hinge shaft is slidably connected to the limiting slide groove of the integrated axle frame, and the unequal diameter wheel is connected to the movable tensioning roller through a connecting rod.

[0013] As a specific implementation, 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 piece, and the other end is wound around the constant force output device.

[0014] As another specific embodiment, the synchronous detection structure includes a horizontal frame, a horizontal support box and a measuring instrument. Both ends of the horizontal frame pass through the steel wire rope and are placed on the upper end of the horizontal support box. The horizontal support box can be slid and fixedly passed through the steel wire rope and a displacement sensor is installed inside it. The measuring instrument is installed in the middle position of the upper end of the horizontal frame.

[0015] Specifically, the method of detection by the vibration and warping detection mechanism in cooperation with the synchronous testing device is: the slackness of both sides of the running belt is monitored through the detection frame. When slackness is detected, the force control component receives the signal to start the constant force outputter, and drives the unequal diameter balancing parts to rotate through the wire rope, drives the movable tensioning roller to move down and re-tension the running belt, and the synchronous detection structure records the motion parameters in real time to realize bilateral strength balance detection.

[0016] Technical solution 2: The present invention also provides a method for synchronously detecting surface defects of a treadmill belt, the method comprising the following steps: Step 1: Performing a running stability test on the running belt using a vibration and warping detection mechanism, wherein the vibration and warping detection mechanism comprises two detection frames symmetrically mounted on both sides of the running belt; Step 2: Place the thread across both sides of the running belt, making sure the thread is in slight contact with the belt surface. Step 3: monitoring the displacement change of the thread in real time through a displacement detection component; Among them, the vibration and warping detection mechanism includes two detection frames symmetrically installed on both sides of the treadmill, the detection frame includes a detection frame body and several brushes distributed on the sides of the detection frame body, the edge of the treadmill is embedded between the brushes, and the brushes are used to detect large-scale warping deformation of the edge of the treadmill; the wire is a flexible filament structure, and its two ends are respectively connected to spring tensioners arranged on both sides of the treadmill, the spring tensioner includes a spring element and a tensioning adjustment mechanism, which is used to provide a constant tensioning force for the wire, and the spring tensioner is fixedly installed on the detection frame; the displacement detection component includes a displacement sensor and a signal processing unit, the displacement sensor is in contact or non-contact connection with the wire, and is used to monitor the displacement change of the wire in real time, the signal processing unit amplifies, filters and digitizes the displacement signal, and when a defect appears on the surface of the treadmill, touching or hooking the wire will produce a measurable displacement change, the brush and the wire form complementary detection, covering all defect types from minor defects to obvious deformation.

[0017] Preferably, the filaments are selected from nylon filaments or carbon fiber filaments with a diameter of 0.1-0.2 mm.

[0018] 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 for the first-level alarm is that the yellow indicator light is lit when the wire displacement is greater than 20 mm and the duration exceeds 2 seconds but the displacement speed is less than 2 mm / s, the triggering condition for the second-level alarm is that the orange indicator light flashes when the wire displacement is greater than 40 mm or the displacement speed is greater than 5 mm / s, and the triggering condition for the third-level alarm is that the red indicator light is always on when the wire displacement is greater than 60 mm or the displacement speed is greater than 10 mm / s.

[0019] Beneficial effects: Compared with the existing technology, the present invention realizes the synchronous detection of the strength durability and bilateral strength balance of the running belt material through a synchronous testing device, can accurately identify the unevenness of the fatigue strength attenuation of the materials on both sides of the running belt, and improves the comprehensiveness and accuracy of the detection; adopts a balance linkage mechanism with an unequal diameter-lever composite structure, which can independently respond to the relaxation of both sides of the running belt, and realizes accurate measurement of the running belt deformation through mechanical transmission, thereby improving the test accuracy; realizes real-time monitoring of tiny defects on the surface of the running belt through the silk thread detection mechanism, and can detect surface cracks, fiber pullout and other microscopic defects that affect the overall strength of the running belt, filling the gap in the existing technology in surface defect detection; establishes a three-level alarm mechanism, which can adopt different processing strategies according to the severity of the defect, thereby improving the intelligence level and safety of the detection system; through the complementary detection of brushes and silk threads, all defect types from tiny defects to obvious deformations are covered, thereby realizing all-round monitoring of the running belt quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the overall flow chart of the running belt detection system; Figure 2 Flowchart for the installation and debugging of the running belt; Figure 3 Flowchart for parameter setting and calibration; Figure 4 Debugging flow chart for the yarn detection mechanism; Figure 5 Schematic diagram of the structure of the wire detection mechanism; Figure 6 This is a structural diagram of the basic test tooling; Figure 7 This is a schematic diagram of part of the structure when the running belt is not installed; Figure 8 It is a structural diagram of a synchronous test device; Figure 9 It is a structural diagram of the balancing linkage mechanism; Figure 10 This is the initial structural diagram of the treadmill test; Figure 11 This is a schematic diagram of the structure of the running belt test when the steel wire rope is pulled to the limit; Figure 12 for Figure 6 A partial enlarged view of point Ⅰ in the middle; Figure 13 This is a structural diagram of the improved structure of the synchronous test device.

[0021] Reference numerals: Treadmill 01, test bench 10, running drive device 20, size adjustment device 30, tensioning stabilization structure 40, synchronous testing device 50, vibration and warping detection mechanism 60, control cabinet 70, first mounting plate 11, second mounting plate 12, drive motor 21, synchronous belt 22, active roller 23, driven roller 24, end frame 25, length adjustment structure 31, width adjustment structure 32, connecting plate frame 41, stabilization component 42, tensioning roller assembly 51, balancing linkage mechanism 52, synchronous detection structure 53, detection frame 61, support Frame 612, brush 613, sliding guide rail 311, guide slot 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 member 5221, lever arm 5222, unequal diameter wheel 5223, hinge shaft 5224, limiting slot 5225, sliding sleeve 5226, wire rope 5231, constant force output device 5232, protrusion 02. Thread detection mechanism 80, spring tensioner 81, housing 811, coil spring 812, tensioning force adjustment hole 813, thread 82, displacement detection assembly 83, laser displacement sensor 831. DETAILED DESCRIPTION

[0022] The present invention provides a treadmill belt durability and bilateral strength balance testing tool, which utilizes existing technology to simulate the treadmill belt 01 running for a certain period of time, and then detects the durability of the treadmill belt by testing the deformation degree and material relaxation strength of the treadmill belt. At the same time, through a specific structural design, the tensioning strength difference on both sides of the treadmill belt and the unevenness of material fatigue strength attenuation under the same operating conditions are obtained and compared and analyzed. By monitoring the wrapping support force changes of the materials on both sides of the treadmill belt, the degree of elastic recovery strength loss, and the strength balance symmetry of the left and right sides, and cooperating with a wire detection mechanism to monitor tiny defects on the surface of the treadmill belt in real time, the material strength durability and bilateral strength balance of the treadmill belt can be detected simultaneously, and microscopic defects that affect the overall strength of the treadmill belt, such as surface cracks and fiber pullout, can be identified.

[0023] Example 1, basic test tooling: Refer to the attached Figure 6-Figure 7This embodiment provides a treadmill belt strength and balance testing tool, including: The test bench 10 is used as a support and mounting platform for the test fixture. The following devices are installed on the test bench 10. The driving device 20 simulates the operation of a treadmill and includes a driving motor 21, a synchronous belt 22, a driving roller 23, and a driven roller 24. The running belt is mounted on the driving roller 23 and the driven roller 24. The synchronous belt 22 connects the output end of the driving motor 21 to the driving roller 23 to simulate the actual use of the running belt through continuous operation. (This is a known technology in the art and will not be described in detail.) The size adjustment device 30 is connected to the driving roller 23 and the driven roller 24 and includes a length adjustment structure 31 and a width adjustment structure 32. This allows for the installation of treadmills of varying lengths and widths, ensuring that treadmills of varying material thicknesses and fiber densities can obtain appropriate pretension. (This is known in the art and will not be described in detail.) A tensioning and stabilizing structure 40 is provided along the length of the treadmill to ensure stable operation of the treadmill, reduce loosening of the treadmill caused by vibration, maintain the stability of the material stress state, and improve measurement accuracy (this is a known technology in the art and will not be described in detail); Synchronous test device 50 is the core innovation part of this test tool, refer to Figure 3 , including a tensioning roller assembly 51 for transmitting the deformation effect of the running belt, a two-balance linkage mechanism 52 for converting the deformation amount of the running belt to facilitate measurement, and a synchronous detection structure 53 for displaying the detection results.

[0024] The vibration and warping detection mechanism 60 includes two detection frames 61 symmetrically installed on both sides of the running belt, which serve as the basis for judging the operation of the two balancing linkage mechanisms 52. They are used to amplify the vibration amplitude and vibration frequency of the running belt when it is initially installed, so as to facilitate the observation of whether the running belt is running smoothly and determine the time to officially start the running belt test.

[0025] Detailed structure of synchronous test device: refer to Figure 8 , wherein: the tension roller assembly 51 includes multiple tension rollers, preferably three tension rollers in this embodiment, and are distributed in an inverted isosceles triangle shape, namely a movable tension roller 511 located in the middle and fixed tension rollers 512 located on both sides. The treadmill passes through the three tension rollers in sequence and is wrapped around the lower half of the curved surface of the movable tension roller 511 (see Figure 8 ); Two balancing linkage mechanisms 52 are respectively provided at both ends of the tensioning roller assembly 51. Each balancing linkage mechanism 52 is fixedly connected to the end of the fixed tensioning roller 512 on the corresponding side, and is movably connected to the end of the movable tensioning roller 511 on the corresponding side. In other words, the balancing linkage mechanism 52 is independently adjustable up and down for the movable tensioning roller 511 on both sides. After the slack strength of the running belt material decreases (the slack strength usually has an uneven characteristic on both sides), the running belt can be restored to the desired balance by adjusting the movable tensioning roller 511 on one side to move up and down, so that the running belt is re-tensioned to the set stress level. The synchronous detection structure 53 is linked between the two balancing linkage mechanisms 52 and can simultaneously obtain motion information of the two balancing linkage mechanisms 52 to calculate the deformation of the running belt.

[0026] The testing principle of the synchronous testing device 50 is as follows: During operation, the treadmill belt may sag due to material fatigue, resulting in a decrease in strength. This weakens the wrapping support between the treadmill belt and the active tensioning roller 511. Since the degree of material fatigue on either side of the treadmill belt typically differs, this sag often occurs asymmetrically. At this point, the two independent balancing linkage mechanisms 52 respond to the sag on their respective sides. Through their respective force control assemblies 523, the corresponding active tensioning rollers 511 independently move downward, re-pressing them against the corresponding position on the treadmill belt, restoring the belt's tension. The synchronous detection structure 53 monitors the motion parameters of the two balancing linkage mechanisms 52 in real time, including their displacement, rotation angle, and motion time. By comparing and analyzing the motion differences between the two mechanisms from the start to the end of the test, the magnitude of the imbalance in material strength decay on the left and right sides of the treadmill belt is determined, thereby assessing the strength difference between the two edges of the treadmill belt. Simultaneously, the motion trajectories, response speeds, and final positions of the balancing linkage mechanisms 52 on both sides are compared and analyzed to quantify the strength balance symmetry of the two sides of the treadmill belt under the same operating conditions, ensuring the accuracy and reliability of the test results.

[0027] Specifically, the balance linkage mechanism 52 adopts an unequal diameter-lever composite structure, which can be referred to Figures 9-13 ,include: The integrated shaft bracket 521 is connected to the upper end of the workbench and serves as an integrated mounting component for other components of the mechanism. It is also fixedly connected to the fixed tensioning roller 512. The lever linkage assembly 522 is the core assembly of the mechanism, and includes an unequal diameter balance piece 5221 as a lever. The unequal diameter balance piece 5221 is symmetrically arranged on both sides of the integrated shaft frame 521 (such as Figure 4 As shown), including a lever arm 5222 and an unequal diameter wheel 5223 (as Figure 5As shown in FIG), the upper end of the unequal diameter wheel 5223 abuts against the top plate 5211 of the integrated shaft frame 521, and at the same time, the unequal diameter wheel 5223 is offset and hinged with a hinge shaft 5224 as a lever fulcrum, and the hinge shaft 5224 is slidably connected to the limiting slide groove 5225 of the integrated shaft frame 521 (as shown in FIG). Figure 5 As shown), it is also connected to the movable tensioning roller 511 through a connecting rod (the connecting rod is not shown in the figure), which can be referred to Figure 5 At the beginning of the treadmill test, the hinge shaft 5224 is located at the top of the limiting slide groove 5225, and the end of the unequal-diameter wheel 5223 that is shorter than the center of the hinge shaft abuts against the top plate 5211, and the distance between the end of the unequal-diameter wheel 5223 abutting against the top plate 5211 and the center of the hinge shaft 5224 increases linearly as the lever arm 5222 rotates downward.

[0028] The force control assembly 523 is provided at the lower end of each lever arm 5222 and is used to independently apply a preset external force to the unequal diameter balancing member 5221 on the corresponding side, driving the unequal diameter wheel 5223 to rotate, thereby driving the movable tensioning roller 511 on the corresponding side to move downward.

[0029] In this embodiment, reference Figure 9 The force control component 523 can be realized by using a steel wire rope 5231, connecting one end of the steel wire rope to the unequal diameter balance member 5221, and winding the other end of the steel wire rope around a constant force output device 5232 that can provide a constant external force. The constant force output device 5232 can be a servo winch, a magnetic powder brake, a torque motor, etc.

[0030] refer to Figure 12 As a structural variation, the lever linkage assembly 522 can also adopt an improved design: the shape of the unequal diameter wheel 5223 is slightly changed, and the limiting sliding groove 5225 is eliminated (such as Figure 8 As shown, the unequal-diameter wheel 5223 can only rotate via the hinge shaft 5224. The protrusion 02 of the unequal-diameter wheel 5223 is then used to push the movable tensioning roller 511 downward via the sliding sleeve 5226 during rotation. To ensure that the movable tensioning roller 511 can return to its original position during repeated testing, a return spring (not shown) is connected to the upper end of the sliding sleeve 5226. Therefore, when the external force of the force control assembly 523 is adjusted to disengage the unequal-diameter balancing member 5221 from the sliding sleeve 5226, the sliding sleeve 5226 can drive the movable tensioning roller 511 upward to its original position via the return spring.

[0031] Compared with the standard structure in which the downward movement or return of the movable tensioning roller 511 is controlled directly 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 tensioning roller 511 downward, and then uses the elastic force of the return spring to return to its original position. This design can more accurately control the elastic restoring force of the running belt material.

[0032] To ensure that the movable tension roller 511 can move stably under the drive of the connecting rod, avoid the running belt shaking or deflecting due to its unstable movement, which will affect the accuracy of the test. Figure 4 The end of the movable tensioning roller 511 is covered with a sliding sleeve 5226, and the sliding sleeve 5226 is connected to the integrated shaft frame 521 for vertical sliding connection.

[0033] The balancing linkage mechanism 52 cooperates with the vibration and warping detection mechanism 60 and the synchronous detection structure 53 throughout the entire test process. The overall test process is as follows: When the treadmill is initially installed, the size adjustment device 30, the synchronous belt 22, the tensioning and stabilizing structure 40, etc. may not be installed in the optimal position, resulting in a large vibration amplitude during the treadmill operation. At this time, the vibration and warping detection mechanism 60 can be used to monitor the running stability of the treadmill. By adjusting these structures until the treadmill reaches a state ready for testing, the synchronous detection structure 53 is adjusted after the treadmill is running smoothly, so that the motion parameters on both sides of the treadmill are consistent or the difference is negligible, thereby ensuring the accuracy and reliability of the test results. The two detection frames 61 of the vibration and warping detection mechanism 60 are used to monitor the slack of the two sides of the running belt. When one side is looser, the wrapping support force of the running belt on the movable tensioning roller 511 is reduced, and the torque on both sides of the unequal diameter balance member 5221 is unbalanced. At the same time, the force control component 523 is Upon receiving the signal from the detection frame 61, the constant force output device 5232 is activated and winds the steel wire rope 5231. The steel wire rope 5231 drives the power arm 5222 and the unequal diameter wheel 5223 to rotate downward, so that the distance between the end of the unequal diameter wheel 5223 that abuts the top plate 5211 and the center of the hinge shaft 5224 increases. The hinge shaft 5224 moves downward under the action of the lateral limit and longitudinal guidance of the limiting slide 5225, and drives the end of the movable tensioning roller 511 on this side to move downward independently through the connecting rod until it is pressed against the running belt, so that the running belt is re-tensioned, and the torque on both sides of the unequal diameter balance member 5221 is balanced again, and the constant force output device 5232 stops moving. The treadmill continues to run in a tensioned state and repeats the above steps of monitoring the slack of the two sides of the treadmill and subsequently moving the corresponding movable tensioning roller 511 to re-tension the treadmill; When the running belt stops running after reaching the test time, the synchronous detection structure 53 can be used to measure the rotation angle of the unequal diameter balance member 5221 or the height difference of a certain position of the wire rope 5231, thereby indirectly measuring the deformation amount on both sides of the running belt.

[0034] refer to Figure 7 The synchronous detection structure 53 includes a horizontal frame 531, both ends of which pass through the wire rope 5231 and are placed on the upper end of the horizontal support box 532 (see Figure 5 ), the horizontal support box 532 can be slidably and fixedly passed through the steel wire rope 5231, and a displacement sensor (the displacement sensor is not shown in the figure) is installed inside the horizontal support box 532 for monitoring the distance between the horizontal support box 532 and the constant force output device 5232. A measuring instrument 533 is installed in the middle position of the upper end of the horizontal frame 531. The measuring instrument 533 can be a level meter or an inclinometer. When the detection frame 61 detects that the treadmill test can be started, the horizontal support boxes 532 and the horizontal frame on both sides are adjusted so that the lower ends of the horizontal support boxes 532 at both ends are kept in the same horizontal plane, and the horizontal frame 531 is also kept in a horizontal state.

[0035] At the beginning of the treadmill test, the force control components 523 on both sides apply the same preset external force, and the initial values ​​of the displacement sensors and the measuring instrument 533 on both sides are recorded. When the treadmill becomes unevenly loose, the steel wire rope 5231 pulls the unequal diameter balance member 5221 to rotate, causing the horizontal support boxes 532 on both sides to experience asynchronous displacement changes. The positions of both ends of the horizontal frame 531 relative to the initial moment also change. At this time, the displacement sensor values ​​on both sides and the measuring instrument 533 values ​​are recorded and input into the computer system for calculation and analysis. Repeat multiple stages of testing, in which the content of one stage of testing is the content described in the aforementioned test principle process. When one stage of testing is completed and the treadmill becomes loose and irreversible, the loose treadmill can be re-tightened through the length adjustment structure 31, and the unequal diameter balancing member 5221 can be adjusted to return to its initial state where its shorter end is against the top plate 5211. Then, the first stage of testing and analysis and calculation are started again to improve the durability of each side of the treadmill and the accuracy and reliability of the bilateral balance of the treadmill.

[0036] refer to Figure 12 The detection frame 61 includes a bracket 612 and several brushes 613 distributed on the side of the bracket 612. The edge of the running belt is embedded between the brushes 613. The degree of up and down shaking of the brushes 613 and the degree of deformation of the brushes 613 can be observed to determine whether the running belt can start testing.

[0037] At the same time, the detection frame 61 can also understand the warping of the edge of the running belt after running for a certain period of time based on the degree of deformation.

[0038] The vibration and warping detection mechanism 60 may also be equipped with a capture camera (the capture camera is not shown in the figure) for high-definition photography of the deformation degree of the brush, thereby improving the accurate judgment of the running state of the running belt and the warping condition.

[0039] To ensure the accuracy of the running belt test, the running belt must be in a tensioned state during installation and remain stable during operation. Figure 7 , now its installation structure is described in detail.

[0040] The running drive device 20, the active roller 23 and the synchronous testing device 50 are all installed on the test workbench 10 through the first mounting plate 11, and the driven roller 24 and the detection frame 61 are all installed on the test workbench 10 through the second mounting plate 12. The end frames 25 are detachably installed at both ends of the active roller 23 and the driven roller 24, and the tensioning roller assembly 51 and the balancing linkage mechanism 52 are detachably installed through threaded connection, thereby facilitating the wrapping and installation of the running belt on each roller.

[0041] The length adjustment structure 31 adjusts and tensions the running belt by moving one end of the driven roller 24. It includes a sliding guide rail 311 arranged on the test workbench 10, and the second mounting plate 12 is slidably installed on the sliding guide rail 311. It can be driven by a motor, pneumatic components or hydraulic components.

[0042] The width adjustment structure 32 includes a plurality of guide grooves 321, which are respectively slidably connected to the end frame 25 of one side of the active roller 23, the end frame 25 of one side of the driven roller 24, and the balancing linkage mechanism 52 on one side, and are fixed by standard parts such as bolts or screws.

[0043] The tensioning and stabilizing structure 40 includes a connecting plate frame 41 that is slidably connected to the second mounting plate 12, and the driven roller 24 is installed on the connecting plate frame 41. The connecting plate frame 41 is abutted against a stabilizing component 42 along the length direction of the running belt. The stabilizing component 42 can be implemented by using a bolt with one end abutting against the connecting plate frame 41 and the other end being threadedly connected to a fixed support block.

[0044] Furthermore, the stabilizing components 42 are provided with two groups, and the other group is in contact with the drive motor 21 along the length direction of the running belt. On the one hand, it can buffer part of the motor vibration and improve the stability of the running belt. On the other hand, it cooperates with the drive motor 21 to improve its fixed drive after the sliding connection with the first mounting plate 11. Therefore, the tension of the synchronous belt 22 wound between the drive motor 21 and the active roller 23 can be adjusted and kept stable, thereby ensuring the stable power transmission of the drive motor 21 to the running belt.

[0045] The test fixture is further equipped with a control cabinet 70 , which can adjust the parameters of the electric components, hydraulic components, or pneumatic components involved in this embodiment.

[0046] Example 2: Treadmill belt testing tool with integrated thread detection mechanism Reference Figure 1-Figure 5 This embodiment expands upon the first embodiment and incorporates a thread detection mechanism 80 to address the inability of existing testing fixtures to detect minor defects on the running belt surface. This mechanism uses a thread as a trigger medium, combined with displacement sensing and signal processing, to monitor minor defects such as small cracks, fiber pullouts, and joint anomalies on the running belt surface in real time.

[0047] The thread detection mechanism 80 is integrated into the existing vibration and warping detection mechanism 60. Threads running across the belt gently contact the surface. When tiny bumps, cracks, or loose fibers appear on the surface, they catch or hook the threads, causing measurable displacement. The entire detection process utilizes non-contact laser or visual inspection, without disrupting the normal operation of the running belt. It also features a graded alarm mechanism and automatic protection (thread breakage protection in the event of excessive displacement).

[0048] Structural composition: The wire detection mechanism 80 includes: a spring tensioner 81 fixed on each vibration and warping detection mechanism 60, a wire 82 as a detection medium, and a displacement detection component 83 for monitoring the displacement of the wire 82.

[0049] The spring tensioner 81 is located on both sides of the running belt, with one on each side, that is, two in a group. The spring tensioner 81 includes a shell 811 fixedly connected to the vibration and warping 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 respectively connected to one end of the wire 82. The elastic restoring force of the coil spring 812 provides basic tensioning force for the wire 82. The shell 811 can be made of aluminum alloy, and the inner surface is anodized to reduce friction. A tension adjustment hole 813 is provided on the shell 811. By setting an adjustment screw in the tension adjustment hole 813, the pre-compression amount of the coil spring 812 can be changed, thereby adjusting the output tension.

[0050] The wire 82 is made of, for example, nylon or carbon fiber with a diameter of 0.1-0.2 mm. The selected wire must have the characteristics of high strength, low elongation, and wear resistance. The wire 82 spans across both sides of the treadmill, and its two ends are connected to the corresponding spring tensioners 81. During the operation of the treadmill, the wire 82 maintains a slight contact with the surface of the treadmill or a small distance of 1-2 mm. When a defect appears on the surface of the treadmill, the wire 82 is touched or hooked, causing it to deviate from its original position and produce a measurable displacement change. The elastic properties given to the wire 82 by the spring tensioner 81 enable it to quickly return to its original position after a slight touch. That is, when the defect is not at a serious level, the test continues.

[0051] The displacement detection component 83 uses a laser displacement sensor 831 with a measurement range of ±10mm, an accuracy of ±0.1mm, and a response frequency of 2kHz. The sensor is fixed to the detection frame 61 via an adjustable bracket.

[0052] Furthermore, a wire-cutting mechanism can be provided to activate when the wire displacement is excessive. For example, an electromagnetic cutter or thermal cutoff device can be installed at an appropriate location to quickly cut the wire. Alternatively, a magnetic attraction mechanism can be used to automatically disconnect the wire when the displacement exceeds the limit. This protects the equipment from damage caused by wire entanglement or drag, ensuring the safe operation of the test device.

[0053] Detection principle and data analysis algorithm: The working principle of the thread 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 thread, generating a forward drag force, causing the thread to deviate from the standard position; when the running belt fibers are pulled out, the pulled fibers will entangle the thread, driving it to move; when defects such as burrs and bumps appear at the joints, they will directly contact the thread, causing displacement; these changes are captured by laser displacement sensors or visual monitoring. The system identifies the defect type by analyzing the temporal characteristics of the displacement: instantaneous displacement (duration <1 second) generally indicates a one-time defect such as the passage of a small particle or burr; sustained displacement (duration >5 seconds) indicates a continuous defect or severe damage such as a long crack or large-area wear; the displacement speed reflects the severity of the defect; the faster the speed, the more prominent the defect; the displacement frequency can be used to analyze the distribution of defects; high-frequency repetitive displacement may indicate periodic defects on the running belt surface.

[0054] The data analysis algorithm utilizes multi-dimensional feature extraction technology, combining parameters such as displacement amplitude, duration, rate of change, and frequency characteristics to establish a defect recognition model. The system digitally filters the raw displacement signal to remove high-frequency noise and environmental interference. A peak detection algorithm identifies displacement events and calculates characteristic parameters. A trend analysis algorithm statistically analyzes data from consecutive inspection cycles to identify trends in belt quality. The system also features adaptive functionality, automatically adjusting detection thresholds and alarm parameters based on the characteristics of different belt types.

[0055] The system has established a three-level alarm mechanism, with different handling strategies based on the severity of the defect. Level 1 alarm targets minor defects and is triggered when the thread displacement exceeds 20 mm for more than 2 seconds, but the displacement speed is less than 2 mm / s. When triggered, a yellow indicator light illuminates and a short beep sounds. The defect location and data are recorded, and the sampling frequency is increased to 5 kHz, without affecting the normal operation of the running belt.

[0056] The Level 2 alarm targets moderate defects and is triggered when the thread displacement exceeds 40mm or the displacement speed exceeds 5mm / s, or when the Level 1 alarm occurs three or more times in a row, or when the displacement lasts for more than five seconds. When triggered, the orange indicator light flashes and three consecutive beeps sound, automatically reducing the running speed to 50%, activating the image recording function, and sending an alarm message to the monitoring system.

[0057] Level 3 alarms target serious defects and are triggered by conditions such as a wire displacement greater than 60mm, continuous movement for more than 10 seconds, a displacement speed greater than 10mm / s, or detection of a wire break. When triggered, the red indicator light stays on and a long beep sounds, automatically stopping the belt. Depending on the magnitude of the displacement, a reset sequence or emergency shutdown sequence is initiated. An emergency alarm is sent to the management system, locking the test state and awaiting manual intervention.

[0058] The integrated design of the thread detection mechanism 80 and existing test fixtures fully considers structural compatibility and functional complementarity. In terms of structural integration, the thread detection mechanism utilizes the existing detection frame 61 structure of the vibration and warping detection mechanism 60, allowing for fixed installation through reserved mounting holes. This complements the existing brush 613 in terms of functionality: the brush 613 detects significant warping deformation (greater than 5mm), while the thread detection mechanism detects minor defects (1-5mm range). Together, these two systems cover the full range of defect types, from subtle to significant.

[0059] In terms of control system integration, the signal processing component 84 of the wire detection mechanism is integrated into the existing control cabinet 70 .

[0060] Example 3: Treadmill belt strength and durability test method This embodiment is based on the test tooling of the aforementioned embodiments 1 and 2, and provides a systematic treadmill belt strength and durability testing method. Through standardized testing procedures, parameter settings and data analysis, a comprehensive evaluation of the strength characteristics of the belt material and accurate detection of bilateral balance are achieved.

[0061] Pre-test preparation stage: Installation and debugging of the running belt: According to the specifications and dimensions of the running belt to be tested, adjust the lateral positions of the active roller 23, the driven roller 24 and the balancing linkage mechanism 52 through the width adjustment structure 32 to ensure that the running belt can correctly wrap around each roller shaft; install the running belt on the active roller 23, the driven roller 24 and the tensioning roller assembly 51 in sequence to ensure that the running belt runs correctly and is not twisted; adjust the position of the driven roller 24 through the length adjustment structure 31 to make the running belt reach the initial tensioning state. The initial tensioning force should be controlled at 80-90% of the rated tensioning force of the running belt; start the running drive device 20 and test run it at a low speed (0.5-1.0m / s) for 5-10 minutes to observe the running stability of the running belt. Judge whether the running belt is running smoothly by the vibration and deformation of the brush 613 of the warping detection mechanism 60.

[0062] Test parameter settings: Set the running speed according to the type and thickness of the running belt material: 3-5 m / s for thin running belts (thickness ≤ 3 mm), and 2-4 m / s for thick running belts (thickness > 3 mm); set the test running time: 8-12 hours of continuous running for the standard test, and 24-48 hours of continuous running for the accelerated aging test; adjust the force control component 523 of the balancing linkage mechanism 52, and set the preset external force to 1.2-1.5 times the weight of the running belt to ensure that it can sensitively detect changes in material strength; calibrate the measuring instrument 533 and displacement sensor of the synchronous detection structure 53, and record the initial baseline value.

[0063] Debugging of yarn detection mechanism: Adjust the tension of the spring tensioner 81 to 2-4N, ensuring that the wire 82 maintains a slight gap of 1-2mm with the treadmill surface; calibrate the measurement zero point of the laser displacement sensor 831, and set the detection thresholds: level 1 alarm, level 2 alarm, and level 3 alarm; test the response time of the level 3 alarm mechanism and the reliability of the reset function.

[0064] Standard strength and durability test process: Phase 1: Basic strength test (0-2 hours); Start the test fixture, and the treadmill runs stably at the set speed, and record the position parameters of the balancing linkage mechanisms 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; monitor the alarm status of the wire detection mechanism 80 in real time, and record the frequency and position distribution of the first-level alarm; observe the deformation of the treadmill edge through the vibration and warping detection mechanism 60, and record the deformation degree of the brush 613.

[0065] Phase 2: Fatigue strength monitoring (2-8 hours); Continue running the test, focusing on monitoring the movement changes of the balancing linkage mechanisms 52 on both sides. When the running belt material fatigue causes relaxation, the corresponding side of the movable tensioning roller 511 will move downward; record the rotation angle changes of the unequal diameter balancing parts 5221 every hour, and analyze the differences in fatigue strength attenuation of the materials on both sides; monitor the changing trend of the wrapping support force. When the support force drops by more than 10% of the initial value, it indicates that the material strength begins to decay significantly; count the alarm upgrades of the wire detection mechanism. An increase in the frequency of the first-level alarm indicates an increase in surface defects, and the appearance of the second-level alarm indicates an increase in the severity of the defects.

[0066] Phase 3: Strength balance analysis (8-12 hours); An in-depth analysis is performed on the differences in motion data of the balancing linkage mechanisms 52 on both sides, and the strength asymmetry coefficients of the left and right sides are calculated. The bilateral balance is quantified by the degree of inclination of the horizontal frame 531; an inclination angle exceeding 2° indicates a significant difference in strength between the two sides. The alarm data of the wire detection mechanisms on both sides are compared and analyzed to evaluate the symmetry of the surface defect distribution. The final material strength retention rate and bilateral balance rating are recorded.

[0067] Accelerated aging strength test process; High-intensity operation setting: Increase the operating speed to 1.5 times that of the normal test and increase the ambient temperature to 35-40°C (if conditions permit); adjust the preset external force of the force control component 523 to 1.3 times the normal value to simulate high-load usage conditions; shorten the data recording interval to 15 minutes and increase the monitoring frequency.

[0068] Accelerated assessment of strength decay: Focus on monitoring the rate of strength change within the first 6 hours and establish a material fatigue curve; when the strength difference between the two sides exceeds 15% or a level 3 alarm occurs, stop the test immediately and analyze the cause; use accelerated aging data to estimate the strength life of the treadmill under normal use conditions.

[0069] Strength and durability evaluation indicators: Material strength retention rate: The ratio of the running belt tension strength to the initial strength at the end of the test. ≥85% is excellent, 70-85% is good, and <70% is unqualified; Fatigue strength decay rate: the rate of decrease in material strength per unit time, <2% / hour is excellent, 2-5% / hour is good, and >5% / hour is unqualified; Elastic recovery strength: The degree to which the rebound force is retained when the treadmill is re-tensioned after being relaxed. ≥90% is excellent.

[0070] Bilateral strength balance evaluation index: Left-right strength symmetry coefficient: |(left strength - right strength) / average strength| × 100%, <5% is excellent, 5-10% is good, >10% is unqualified; Bilateral fatigue consistency: The difference in fatigue decay rate between the two sides of the material is less than 3%, which is excellent. Symmetrical distribution of surface defects: The ratio of the number of defects on the left and right sides of the wire is calculated through wire inspection. The normal range is 0.8-1.2.

[0071] Comprehensive evaluation level: Grade A (Excellent): Strength, durability, and bilateral balance all meet excellent standards, without level 3 alarms, suitable for high-end treadmills; Grade B (good): The main indicators meet the good standards, there may be a small number of first and second level alarms, suitable for mid-range treadmills; Grade C (qualified): basic indicators meet the qualified standards, but there are certain defects, suitable for entry-level treadmills; Level D (Unqualified): Key indicators do not meet the standards or a level 3 alarm occurs. It is not recommended for use.

[0072] Test report generation: Automatically generate a standardized test report containing all test data, curve charts and evaluation conclusions; provide a running belt strength change trend chart, a bilateral balance comparison chart and a surface defect distribution chart; and provide the expected service life of the running belt and maintenance recommendations.

Claims

1. A method for detecting the strength and balance of a treadmill belt, the method comprising the following steps: Step 1: The running belt to be tested is mounted on a running drive device (20) including a driving roller (23) and a driven roller (24) and is continuously operated; Step 2: Performing bilateral strength monitoring on the running treadmill by means of a synchronous testing device (50), characterized in that: The synchronous testing device (50) comprises a tensioning roller assembly (51), two balancing linkage mechanisms (52) and a synchronous detection structure (53). The tensioning roller assembly (51) comprises a movable tensioning roller (511) located in the middle and fixed tensioning rollers (512) located on both sides. The two balancing linkage mechanisms (52) are respectively arranged at both ends of the tensioning roller assembly (51) and are movably connected to the movable tensioning rollers (511) on the corresponding sides. The synchronous detection structure (53) is linked between the two balancing linkage mechanisms (52) and is used to simultaneously obtain motion information of the two balancing linkage mechanisms (52) to calculate the deformation of the running belt. When the running belt is loose due to material fatigue, the balancing linkage mechanism (52) on the loose side automatically responds and drives the movable tensioning roller (511) on the corresponding side to move downward to re-tighten the running belt.

2. The treadmill belt strength balance detection method according to claim 1, characterized in that: The continuous running test time in step 1 is 8-12 hours, and the initial tension is controlled at 80-90% of the rated tension of the treadmill.

3. The treadmill belt strength balance detection method according to claim 2, characterized in that: In the initial stage of continuous operation of step 1, a vibration and warping detection mechanism (60) is set to perform running stability detection on the running belt to be tested. The vibration and 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-shaped bracket (612) and a plurality of brushes (613) distributed on the sides of the bracket (612). The bracket (612) is a supporting structure for carrying the brushes (613) and fixing the position of the entire detection frame (61). The edge of the running belt is embedded between the brushes (613). The running stability of the running belt is judged by observing the degree of deformation of the brushes (613).

4. The treadmill belt strength balance detection method according to any one of claims 1 to 3, characterized in that: The balancing linkage mechanism (52) adopts an unequal diameter-lever composite structure, comprising an integrated shaft frame (521) having a limiting sliding groove (5225), a lever linkage assembly (522) and a force control assembly (523); the lever linkage assembly (522) comprises an unequal diameter balancing member (5221) serving as a lever; the unequal diameter balancing member (5221) comprises a force arm (5222) and an unequal diameter wheel (5223); the unequal diameter wheel (5223) is offset and hinged with a hinge shaft (5224) serving as a lever fulcrum; the hinge shaft (5224) is slidably connected to the limiting sliding groove (5225) of the integrated shaft frame (521); and the unequal diameter wheel (5223) is connected to a movable tensioning roller (511) via a connecting rod.

5. The treadmill belt strength balance detection method according to claim 4, characterized in that: The force control assembly (523) comprises a steel wire rope (5231) and a constant force output device (5232), wherein one end of the steel 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).

6. The treadmill belt strength balance detection method according to claim 5, characterized in that: The synchronous detection structure (53) includes a horizontal frame (531), a horizontal support box (532) and a measuring instrument (533). Both ends of the horizontal frame (531) pass through the steel wire rope (5231) and are both placed on the upper end of the horizontal support box (532). The horizontal support box (532) can be slidably and fixedly passed through the steel wire rope (5231) and has a displacement sensor installed therein. The measuring instrument (533) is installed in the middle position of the upper end of the horizontal frame (531).

7. The treadmill belt strength balance detection method according to claim 6, characterized in that: The vibration and warping detection mechanism (60) cooperates with the synchronous testing device (50) to perform detection in the following manner: the slack of both sides of the running belt is monitored by the detection frame (61); when slack is detected, the force control component (523) receives a signal to start the constant force output device (5232), drives the unequal diameter balancing member (5221) to rotate through the steel wire rope (5231), drives the movable tensioning roller (511) to move downward to re-tighten the running belt, and the synchronous detection structure (53) records the motion parameters in real time to realize the bilateral strength balance detection.

8. A method for synchronously detecting surface defects of a treadmill belt, the method comprising the following steps: Step 1: Performing a running stability test on the running belt using a vibration and warping detection mechanism (60), wherein the vibration and warping detection mechanism (60) comprises two detection frames (61) symmetrically mounted on both sides of the running belt; 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 belt; Step 3: Real-time monitoring of the displacement change of the thread (82) by means of a displacement detection component (83); Its characteristics are: The vibration and warping detection mechanism (60) comprises two detection frames (61) symmetrically mounted on both sides of the running belt, the detection frame (61) comprises a frame (612) and a plurality of brushes (613) distributed on the sides of the frame (612), the edge of the running belt is embedded between the brushes (613), and the brushes (613) are used to detect large-scale warping deformation of the edge of the running belt; the wire (82) is a flexible filament structure, and its two ends are respectively connected to the spring tensioner (81) arranged on both sides of the running belt, and the spring tensioner (81) comprises a spring element and a tensioning adjustment mechanism, which is used to provide a constant tension for the wire (82). The spring tensioner (81) is fixedly mounted on the detection frame (61); the displacement detection assembly (83) includes a displacement sensor and a signal processing unit. The displacement sensor is in contact or non-contact connection with the wire (82) for real-time monitoring of the displacement change of the wire (82). The signal processing unit amplifies, filters and digitally processes the displacement signal. When a defect occurs on the surface of the running belt, the wire (82) is touched or hooked to generate a measurable displacement change. The brush (613) and the wire (82) form a complementary detection, covering all defect types from minor defects to obvious deformation.

9. The method for synchronously detecting surface defects of a treadmill belt according to claim 8, characterized in that: The silk thread (82) is selected from nylon silk or carbon fiber silk with a diameter of 0.1-0.2 mm.

10. The method for synchronously detecting surface defects of a treadmill belt according to any one of claims 8 to 9, characterized in that: A three-level alarm mechanism is established for defect identification, including yellow, orange and red indicators. The trigger condition for the first-level alarm is that the yellow indicator light is on when the wire displacement is greater than 20 mm and the duration exceeds 2 seconds but the displacement speed is less than 2 mm / s. The trigger condition for the second-level alarm is that the orange indicator light flashes when the wire displacement is greater than 40 mm or the displacement speed is greater than 5 mm / s. The trigger condition for the third-level alarm is that the red indicator light is always on when the wire displacement is greater than 60 mm or the displacement speed is greater than 10 mm / s.

Images