A portable Y-balance intelligent testing device

Abstract

The present invention discloses a portable Y-balance intelligent testing device, belonging to the field of sports testing. The device mainly includes a collapsible slide rail, a slider and a central standing base. Through the hinge structures on the slide rail and between the slide rail and the base, the device can be quickly transformed between the collapsed and expanded states to meet the needs of carrying and measurement. The device also has a built-in posture detection function for single-leg standing. By measuring the pressure readings and judging according to the threshold changes, it can determine whether there is an obvious change in the contact between the sole of the foot and the glass plate, and give a sound prompt for incorrect postures. The device uses laser ranging technology to detect the moving distance of the slider, and can score the measurement results through the built-in evaluation template and upload the data through a wireless transmission module. On the basis of retaining the characteristics of traditional Y-balance testing, the device reduces the burden of device operation and data analysis, improves portability, and endows the device with intelligent evaluation capabilities, and can be used for balance ability testing.

Description

Technical Field

[0001] The present invention relates to a portable Y-balance intelligent testing device, and particularly to a measuring instrument that can be quickly deployed and retracted, can automatically monitor Y-balance test data, and can prompt the experimenter for incorrect actions, belonging to the field of sports testing. Technical Background

[0002] In the field of sports, the detection and evaluation of athletes' balance ability is one of the important evaluation indicators in physical fitness testing (such as FMS testing). The Y-balance test is a very simple balance test scheme that originated abroad. The traditional Y-balance test evolved from the star test, and the main measuring tools are measuring rulers and sliders. Three measuring rulers are evenly distributed circumferentially, with an included angle of 120° between the rulers, and the slider is installed on the measuring ruler. Taking the lower limb Y-balance test as an example, the subject needs to complete three specific actions, respectively pushing the slider at the starting position away from the center with the toes. The longer the pushing distance, the better the balance ability of the subject. Since the Y-balance test has a good test effect on the single-leg dynamic balance of athletes, the equipment is simple, and the test method is easy to promote, it is currently somewhat recognized in sports colleges and teams in China.

[0003] Currently, domestic patents related to the Y-balance test mainly aim to improve the practicality by addressing some drawbacks in the use of measuring rulers and sliders. For example: two utility model patents, CN210903024U and CN211243323U, mainly improvements are: (1) adding a function of detachable guide rails, enhancing the portability; (2) adding a displacement measuring device, improving the measurement accuracy; (3) improving the shape of the single-foot standing flat plate for the subject, reducing the operation error.

[0004] With the promotion of the concept of "integration of sports and medicine" in China, the demand for data in national physical fitness testing has increased significantly. The traditional Y-balance test device is only suitable for testing elite athletes, because (1) the number of athletes is small, and the test environment requirements are simple; (2) the usage period is short, and the test equipment can be temporarily set up; (3) there is a certain threshold for the operation level of the experiment observer. Although the current patents have improved the portability and also enhanced the measurement accuracy by using sensors, the Y-balance test equipment is still a measurement device composed of multiple components temporarily combined, and the systematic error cannot be controlled, making it difficult to be called a scientific measurement system. In addition, the labor intensity of the experiment observer is relatively large during the preparation and implementation of the Y-balance test. The current patents only consider technical improvements from the perspective of the subject, and the measurement device has not deviated from the scope of traditional measurement, and cannot relieve the burden in ergonomics.

[0005] In order to make the Y-balance test device compatible with a more popular physical fitness monitoring field, more scientific test methods, more standardized test equipment, and more convenient operation methods are required. Taking the optimization of the time-cost of each link such as test device preparation, test process monitoring, test result analysis and evaluation as the main starting point, combined with intelligent concepts and means, zero-threshold rapid detection is realized. Summary of the Invention

[0006] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a portable Y-balance intelligent test device. The device has a fast retracting and deploying function, can quickly obtain experimental data through the interface and perform simple data analysis, and can monitor the actions of the subjects in real time and give prompts for incorrect operations.

[0007] In order to achieve the invention purpose, the technical solution adopted by the present invention is: a portable Y-balance intelligent test device, including a retractable slide rail 1, a slider 2 and a central standing base 3. Among them, there are 3 slide rails and sliders respectively, and 1 central standing base. The three slide rails are evenly distributed around the base, and the included angle between adjacent slide rails is 120°. The slider is sleeved on the slide rail, each slide rail corresponds to a slider, and the structure of each slide rail and the supporting slider is the same. Through the hinge structure at the connection part, the slide rail can reduce its length and be retracted, and the test device can be retracted into a barrel shape, which is convenient to be carried in a cloth bag or a long box. When in use, there is no need for installation and debugging. Just unfold the slide rail and power on to start the test. The posture of the subject is monitored by obtaining plantar pressure data, and an alarm device is connected to give prompts in time. The moving distance of the slider is obtained by laser ranging technology and converted into scores to be reported to the subject. The patent follows the external shape of the traditional Y-balance test equipment, mainly considering the user recognition and use convenience.

[0008] The guiding function of the slide rail 1 for the slider 2 is optimized. The slide rail is assembled from main components such as a front slide rail section 4, a rear slide rail section 5, a hinge 6, an M3 flat head screw 7, a leveling knob 8, etc., as Figure 2 shown. The cross-sections of the front slide rail section 4 and the rear slide rail section 5 are as Figure 2As shown in the lower right corner (the highlighted part), there are two inverted trapezoidal grooves 9, one on the left and one on the right, to cooperate with the linear movement of the slider along the track. The front section 4 and the rear section 5 of the slide rail have a cross-sectional width of 60 mm and a radial length of 700 mm, which can adapt to the tests of people with various leg lengths. On the bottom side of the proximal end (i.e., the end close to the center) of the front section 4 of the slide rail and the bottom side of the left end of the rear section 5 of the slide rail, there is a 1-mm deep groove, which is the same size as the blade of the hinge 6. After the blade is embedded in the groove, the 5 M3 threaded holes on the groove correspond to the through holes of the hinge 6 one by one, and 5 M3 flat head screws 7 are tightened corresponding to each threaded hole, connecting the front section 4 and the rear section 5 of the slide rail, lengthening the length of the slide rail. When not in use, the hinge can fold the slide rail in half for easy storage. The leveling nuts are located at the distal end (i.e., the end far from the center of the device) of the front section 4 of the slide rail, and there are two in total. Their main function is to adjust the horizontal inclination angles of the front section 4 and the rear section 5 of the slide rail with the ground to ensure that the driving force for the movement of the slider 2 does not include the influence of the gravity of the slider. The bottom width of the inverted trapezoidal groove 9 of the front section 4 and the rear section 5 of the slide rail is 8 mm, which is the same as the width of the pulley in the slider 2. The design of the inverted trapezoid is mainly to reduce the friction between the pulley 12 and the side wall when the pulley rolls in the groove.

[0009] The slider 2 is the main component for testing balance, and its structure consists of an upper cover 10, a bottom cover 11, pulleys 12 and axle shafts 13, as Figure 3 shown. Two wheel axle fixing fulcrums 14 extend from the inner surface of the upper cover 10. The axle shafts 13 pass through the two wheel axle fixing fulcrums 14 respectively and are interference-fixed with the pulleys 12. The length of the axle shaft 13 is equal to the center distance between the two inverted trapezoidal grooves 9 on the front section 4 and the rear section 5 of the slide rail. A pulley 12 with a radius of 20 mm is fixed at each end of each axle shaft 13. The area where the axle shaft 13 needs to pass through the wheel axle fixing fulcrum 14 is polished and waxed to ensure smooth rotation between the axle shaft 13 and the wheel axle fixing fulcrum 14 when the pulley 12 rolls. There is a screw mounting hole 15 at each of the four corners of the upper cover 10 and the bottom cover 11, corresponding to the M3 flat head screws 7. The M3 flat head screws 7 first pass through the screw mounting holes 15 of the bottom cover 11 from the bottom side of the slider 2 and then are screwed tightly with the screw mounting holes 15 of the upper cover 10. The upper cover 10 and the bottom cover 11 form a box body 16, which effectively protects the internal pulleys 12. The axle shafts 13 and the wheel axle fixing fulcrums 14 also support the weight of the entire box body 16. In the center of the long side of the box body 16, a transparent window 17 is designed. The window 17 is designed for the slide rail 1 to pass through the slider 2. The dimensions of the window are 2 mm wider and higher than the interface of the front section 4 and the rear section 5 of the slide rail to prevent friction between the window 17 and the side wall of the slide rail 1 during the movement of the slider 2. In addition, to ensure the accuracy of laser ranging, on the long side of the box body 16, below the window 17 on the side facing the central standing base 3 (in the same direction as the proximal end of the guide rail), a reflecting mirror surface 18 with a diameter of 3 mm is also designed. The reflecting mirror surface 18 is cut from a reflective film material and adhered to the box body 16.

[0010] The central standing base 3 is the core device of this patent, and its main functions are as follows: a. Provide a single-foot standing position for the subject; b. Detect whether the local part of the foot is lifted when the subject stands on one leg and provide an alarm prompt; c. Use laser ranging to detect the moving distance of the slider 2; d. Connect to the slide rail 1 to further realize the converging function of the device described in the patent. Viewed from the outside, the central standing base 3 is cylindrical in shape and includes main components such as a housing 19, a glass pressure-sensitive flat plate 20, and a pressure sensor 21. The housing 19 is the main structural support component of the central standing base 3. Three outwardly protruding platforms are designed on the edge of its upper surface, namely the front platform 22, the left-rear platform 23, and the right-rear platform 24. The upper surface of the platform has rectangular grooves 1 mm deep similar to the bottom sides of the front section 4 and the rear section 5 of the slide rail, which are convenient for installing the hinge 6. The installation method is the same as the relevant description in the slide rail 1 and will not be repeated here. The included angle between the three platforms (22, 23, 24) is 120°. When the subject stands, he faces the direction pointed by the front platform 22, and this direction is used as the reference direction. The upper surface of the housing is recessed downward into a cylindrical groove with a depth of 20 mm. There are four circular card slots 25 at the bottom of the groove surface. Each circular card slot 25 installs a pressure sensor 21. The four circular card slots 25 are arranged in a diamond shape, and their positions are exactly located on the front, back, left, and right sides of the human foot. The main function of setting the pressure sensor 21 here is to detect whether the edge of the human foot is lifted during the Y balance test. If this situation occurs, the reading of the pressure sensor 21 in the corresponding direction will change significantly. Through threshold detection, it can help the subject judge whether the experimental data is valid. The lead wire of the power plug 26 passes through the side wall of the housing 19. The power plug 26 is powered by AC220V and mainly provides power for the electronic devices and circuits inside the central standing base 3.

[0011] The interior of the central standing base also includes components such as a power supply module 27, a laser ranging module 28, a fixed cover plate 29, and a digital circuit board 30. The power supply module 27 is connected to the lead wire of the power plug 26 and can convert the commercial power into DC signals of 5V and 3.3V to provide power for the normal operation of other electrical components. A small skylight 31 is also designed on the side wall of the housing 19 at the bottom of each platform (22, 23, 24). The size of the skylight 31 can just expose the lens of the laser ranging module 28 and is approximately the same height as the reflective mirror surface 18 on the slider 2. The laser ranging module 28 is fixed by installing a fixed cover plate 29, and the fixing bolt is also an M3 flat head screw 7. The digital circuit board 30 is designed in a circular shape and is fixed on the column 32 of the housing 19 by M3 flat head screws 7. The power supply module 27 and the laser ranging module 28 are respectively connected to specific interfaces of the digital circuit board 30. The data line of the pressure sensor 21 passes through the housing 19 through the guiding hole 33 on the housing 19 and is connected to a specific interface of the digital circuit board 30.

[0012] The digital circuit board 30 mainly uses an STM32 chip to carry analog modules such as signal amplification and power amplification to achieve the following functions: First, collect pressure signals and, according to the set threshold, command the buzzer to emit an alarm signal to prompt whether the standing posture of the subject's supporting leg meets the requirements of the Y-balance test; Second, collect the signals of the laser ranging module 28 and convert them into the moving distance signals of the slider 2; Third, give a measurement performance score according to the performance scale saved in the memory; Fourth, transmit the data through the Wifi upper port. The analog signals measured by 4 pressures are converted into digital signals through the A / D conversion 34 and input into the pressure value detection module 35. This module presets the threshold ratio (20%) of pressure transformation. When the change ratio of the pressure values collected twice in a row exceeds the threshold, it issues an instruction to the sound generator 36 to generate an audio signal with a fixed frequency. Finally, the buzzer 37 converts the audio signal into sound and emits it. If the function of the buzzer 37 is activated, the pressure value detection module 35 will also issue an instruction to terminate the execution of the subsequent signal processing of the laser ranging module 28. The achieved effect is: If the standing posture of the subject's supporting leg is inclined and the foot does not fully fit the glass pressure-sensitive flat plate 20, it is considered that the test data of this time is invalid, and the subject is warned by the buzzer. If the pressure value detection module 35 determines that the pressure change does not exceed the threshold, the distance digital signal output by the laser ranging module 28 will be input into the slider moving distance calculation module 38, and the actual moving distance of the slider will be calculated according to the difference between the position data of the slider at the start and end of the experiment. The data of the slider moving distance calculation module 38 will be input into the test performance evaluation module 39 to estimate the score value, which is calculated on a five-point scale (1-5). The scoring basis of the test performance evaluation module 39 is a scoring template, which is a standard template obtained by analyzing the experimental test scores of 1000 subjects and the subjective scoring data of professional scorers through a machine learning classifier, and contains a mapping database of the slider moving distance and the score value. The score value can be output according to the slider moving distance transmitted by the moving distance calculation module 38. Since the use of machine learning simplifies the manual scoring link, the evaluation efficiency has been improved. Finally, the data is input into the wireless transmission module 40 to batch send the data to the upper port, such as a PC, mobile phone or tablet, and further processed or visually displayed by writing a program. These functions do not fall within the scope of the device described in the patent, so they will not be described in detail.

[0013] The benefits of this patent are as follows:

[0014] (1) It saves the assembly time of the device and meets the need for rapid detection without system error debugging.

[0015] (2) The device can be retracted, saving handling space, being convenient to carry, and improving portability.

[0016] (3) It uses lidar and pressure detection to achieve the automatic detection function of the device, reducing the burden on the device operator.

[0017] (4) By using the pre-set evaluation module in the early stage, the characteristics of "instant inspection, instant measurement, and instant result output" of the device are highlighted, solving the last hurdle of rapid detection technology.

[0018] (5) Wireless data transmission is more suitable for the needs of today's cloud computing and big data analysis. Description of the Drawings

[0019] Figure 1 It is the overall assembly drawing of the portable Y-balance intelligent testing device.

[0020] Among them: Figure a is the unfolded state, and Figure b is the retracted state.

[0021] 1 - Slide rail; 2 - Slide block; 3 - Central standing base.

[0022] Figure 2 It is the schematic diagram of the slide rail assembly and interface structure.

[0023] Among them: 4 - Front section of the slide rail; 5 - Rear section of the slide rail; 6 - Hinge; 7 - M3 flat head screw; 8 - Leveling knob; 9 - Inverted trapezoidal groove.

[0024] Figure 3 It is the schematic diagram of the slide block structure.

[0025] Among them: 10 - Upper cover; 11 - Bottom cover; 12 - Pulley; 13 - Axle; 14 - Fixed fulcrum of the axle; 15 - Screw mounting hole; 16 - Box body; 17 - Window; 18 - Reflective mirror surface.

[0026] Figure 4 It is the top view of the central standing base.

[0027] Among them: 19 - Shell; 20 - Glass pressure-sensitive plate; 21 - Pressure sensor; 22 - Front platform; 23 - Left rear platform; 24 - Right rear platform; 25 - Circular card slot; 26 - Power plug.

[0028] Figure 5 It is the schematic diagram of the internal structure of the central standing base.

[0029] Among them: 27 - Power module; 28 - Laser ranging module; 29 - Fixed cover plate; 30 - Digital circuit board; 31 - Skylight; 32 - Column; 33 - Guide hole.

[0030] Figure 6 It is the schematic diagram of the functional modules of the digital circuit board.

[0031] Among them: 34 - A / D conversion; 35 - Pressure value detection module; 36 - Sound generator; 37 - Buzzer; 38 - Slide block movement distance calculation module; 39 - Test performance evaluation module; 40 - Wireless transmission module. Detailed implementation mode

[0032] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. At the same time, the technical problems solved by the technical solution of the present invention and the beneficial effects are also described. It should be noted that the described embodiments are only for facilitating the understanding of the present invention and do not limit it in any way.

[0033] A portable Y-balance intelligent testing device consists of a central standing base 3 and a conduction mechanism composed of three slide rails 1 and sliders 2. The slide rails can be divided into a front section 4 and a rear section 5 of the slide rail, which are connected to each other by a hinge 6 structure. Figure 1 As shown in Figures 2 and 4, due to the presence of the hinge 6, the front section 4 and the rear section 5 of the slide rail can be folded relative to each other by 180°, and the rear section 5 of the slide rail and the central standing base 3 can also be folded by 100° with the assistance of the hinge 6. The slider 2 is installed on the slide rail 1. Due to the limitation of the window 17, it will not fall off from the inverted trapezoidal groove 9 and can automatically slide to the bottom end of the slide rail 1 under the influence of gravity. At this time, the device is in a retracted state, and the slide rails can be tightened with a restraint band, which is convenient for putting into a storage bag for transportation.

[0034] When the hinge 6 is fully unfolded, the slide rail 1 is parallel to the ground, and the included angle between the three slide rails is 120 degrees, forming a Y-shaped unfolded state, as shown in Figure 1 (a). Before use, adjust the leveling nut 8 at the distal end of the slide rail 1, and use a leveling instrument such as a level to measure the levelness of the slide rail 1 to prevent the slide rail 1 from tilting in any direction. At the same time, ensure that the inverted trapezoidal grooves 9 of the front section 4 and the rear section 5 of the slide rail are accurately aligned to not affect the movement of the slider 1. Before power on, push the slider 2 to the proximal end of the slide rail 1 to ensure that the slider cannot move towards the central position anymore. At this time, it is the initial position of the slider during the test. Then insert the power plug 26 into the corresponding mains socket, and the current flows into the power module 27 through the wire. The power module 27 provides two specifications of direct current: 5V DC powers the pressure sensor 21 and the digital circuit 30, and 3.3V DC powers the laser ranging module 28.

[0035] There are two main functional improvements in this device: 1) It can accurately detect the moving distance of the slider; 2) It can ensure the monitoring of the human body posture stability during the detection.

[0036] During the test, the subject stands facing the extending direction of one of the slide rails 1. The pulley 12 of the slider 2 cooperates with the inverted trapezoidal groove 9 on the slide rail 1, and the axle 13 of the pulley 12 supports the weight of the slider 2 through the axle fixed fulcrum 14. Since the slider has a reserved window 17 through which the slide rail 1 can pass, and the radius of the pulley 12 is slightly larger than that of the inverted trapezoidal groove 9, there is enough clearance between the slide rail 1 and the slider 2 when the slide rail 1 passes through the window 17, reducing the friction and collision during the movement of the slider 2. A baffle is provided at the distal end of the front section 4 of the slide rail to prevent the slider 2 from falling off during movement. At the bottom of the slide rail 1 is the working area of the laser ranging module 28. The laser ranging module 28 is installed below the front platform 22, the left rear platform 23 and the right rear platform 24 of the central standing base 3. The lens of the laser ranging module 28 points to the working area through the skylight 31. An invisible laser beam is emitted from the laser emitting end, and the beam shines straight onto the reflecting mirror surface 18 at the bottom of the slider 2. After the light is reflected, it returns to the laser ranging module 28 and is acquired by the receiving end. Through the internal circuit conversion of the laser ranging module 28, the relative distance between the slider 2 and the central base 3 can be output.

[0037] When performing the Y balance test, the laser ranging module 28 collects the initial distance L1. The subject stands on one foot on the glass pressure-sensitive plate 20 and touches the slider 1 with the other foot without losing balance. Due to the connection and cooperation among the pulley 12, the axle 13 and the axle fixed fulcrum 14 in the slider 1, the movement of the slider 1 is realized by the rolling of the pulley 12 in the inverted trapezoidal groove 9. When the slider 1 is pushed, the position of the reflecting mirror surface 8 also moves accordingly, and the laser ranging module 28 can re-measure the distance L2 between it and the reflecting mirror surface 8. Therefore, the actual moving distance of the slider is L2 - L1. Usually, the laser ranging module 28 has a minimum distinguishable distance. The parameters of the laser ranging module selected for this device are: recognition distance 0.03 - 8M, accuracy 1mm. Due to the need to install the hinge 6, the initial position of the slider 1 is more than 0.03M away from the laser ranging module 28, so the measurement data are all valid. Since the laser ranging module 28 integrates the digital signal preprocessing function, the output result is the distance data in the form of digital signals, which can be directly read by the digital circuit 30.

[0038] After the digital circuit 30 reads the distance information, the slider movement distance calculation module 38 inside the STM32 chip calculates the slider movement distance L. The test performance evaluation module 39 will compare the value of L with the score template stored in the STM32 memory to obtain the score for the balance test performance (the score is an integer from 0 to 4 points). The template is obtained by analyzing the test results of 1000 people and the subjective scores of experts. 1000 data samples are obtained by the device, including the distance data L and the score P given by the expert according to L (P must be an integer from 1 to 5). Taking L as the abscissa and P as the ordinate, a sample scatter plot is drawn, and a training set is established by random sampling to optimize the Bayesian classifier, obtaining the threshold ranges K1, K2, K3, K4, K5 corresponding to the scores under the five-point system. The test performance evaluation module 39 will judge which threshold Kx range L is located in, and x is the corresponding score. The subject needs to perform tests on 3 slide rails respectively to obtain a set of data, including three scores: xf, xl, xr, corresponding to forward, left-backward, and right-backward. The actual score X of a complete Y balance test can be obtained by adding up the 3 scores. If any of the scores xf, xl, xr does not exist, the addition operation cannot be completed until each score is completed. The score X will be transmitted as a digital signal to the Wifi wireless transmission module 40, and the network will upload the data to the cloud or the corresponding terminal for subsequent processing.

[0039] The upper surface of the central base 3 is a glass pressure-sensitive flat plate 20. When the glass pressure-sensitive flat plate 20 is subjected to pressure, it will produce a small deformation and transmit it to the corresponding four pressure sensors 21 below through four columns. When the subject stands in the center of the glass pressure-sensitive flat plate 20 and tries to push the slider 2, since the human body posture is in dynamic adjustment to maintain balance, the pressure on the sole of the foot is unstable in all directions, so the readings of the pressure sensors 21 in each direction will be different. The digital circuit board 30 is connected to the pressure sensor 21 and the laser ranging module 28. The data line of the pressure sensor 21 is led to the digital circuit board 30 through the guiding hole 33 for soldering. The circuit board 30 is fixed to the three columns inside the central base 1 by bolts to obtain good fixation and grounding. The digital circuit board 30 includes two main modules: the pressure value detection module 35 and the slider movement distance calculation module 38. The pressure value detection module 35 connected to the pressure sensor 21 is responsible for monitoring the reading changes of each pressure sensor in real time: when the subject stands still with both feet, the readings of the four sensors are measured as the reference values. When the fluctuation of the data collected by any pressure sensor 21 is more than 15 - 20% (the specific value can be set) compared with the reference value, it is considered that the human body stability is poor during the data collection process and the data credibility is low. The sound generator 36 and the buzzer 37 connected to the pressure value detection module 35 cooperate with each other to emit a high-frequency alarm buzzer, indicating that this test is invalid and the experiment needs to be carried out again.

[0040] During the Y balance test, it is necessary to ensure that the body does not lose balance. In traditional tests, the main judgment method is to observe whether the subject's feet tend to leave the flat plate. This judgment is extremely dependent on experience and the judgment process is inaccurate. This device utilizes the sensitivity of the glass pressure-sensitive plate 20 to pressure, and converts the pressure exerted by the sole on the glass pressure-sensitive plate 20 into four pressure sensors 21 connected to the glass pressure-sensitive plate 20. Four pressure sensors 21 are set to facilitate the determination of the direction of imbalance. When the body loses balance, it will tilt in eight directions, such as forward, backward, left, right, front left, front right, rear left, and rear right. Therefore, the sole of the foot in the opposite direction of the corresponding tilt direction will separate from the glass pressure-sensitive plate 20, resulting in a significant change in the adjacent pressure sensor 21. Due to the weight difference of different people, the relative pressure change rate needs to be used as the detection standard to judge whether there is an imbalance. The relative pressure change rate is to perform a differential operation on the readings of the same pressure sensor 21 and calculate the slope l. Since the differential operation requires a digital signal, the voltage signal measured by the pressure sensor 21 needs to be first converted into a digital signal through the A / D conversion 34. Then, signal detection is performed in the pressure value detection module 35. Assuming that the adjacent two pressure signals are F1 and F2, the slope l is

[0041] l = |(F1 - F2)| / F1

[0042] The value of l ranges from 0 to 1. By setting the threshold L and judging the numerical relationship between l and L, the next program execution is determined. If l < L, the pressure value detection module 35 has no output; if l > L, the pressure value detection module 35 has two outputs: one output is a low-level signal, and the low-level signal is input to the 36 sound generator and 37 buzzer to generate a continuous beeping sound. When the subject hears the beep, it indicates that the standing foot posture is incorrect and the test is invalid, and adjustment is required. The other output is a high-level signal, which is used to shield the function of the slider movement distance measurement module 38 for 5 seconds. During this period, any data obtained by the laser ranging module 28 cannot be obtained by the slider movement distance measurement module 38. At this time, the score x corresponding to the distance data L in the digital circuit 30 is Null (undefined) and the data cannot be saved. If the output of the pressure value detection module 35 does not stop, X cannot be calculated and it will continue to wait for data.

[0043] The above specific description further details the purpose, technical solution, and beneficial effects of the invention. It should be understood that the above is only a specific embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A portable Y balance intelligent test device, characterized in that, It includes a collapsible slide rail (1), sliders (2) and a central standing base (3). There are three slide rails and three sliders respectively, and one central standing base. The three slide rails are evenly distributed around the base, and the included angle between adjacent slide rails is 120°. The sliders are sleeved on the slide rails, with each slide rail corresponding to one slider, and the structure of each slide rail and the matching slider is the same. Through the hinge structure at the connection part, the slide rail can reduce its length and be folded up. The testing device can be folded into a barrel shape, which is convenient to be put into a cloth belt or a long box for carrying. When in use, there is no need for installation and debugging. Just unfold the slide rail and power on to start the test. By obtaining the plantar pressure data, the posture of the subject is monitored and an alarm device is connected to give prompts in time. By using the laser ranging technology, the moving distance of the slider is obtained and converted into scores to be reported to the subject. The slide rail (1) optimizes the guiding function for the slider (2). The slide rail is assembled by a front section of the slide rail (4), a rear section of the slide rail (5), a hinge (6), M3 flat head screws (7), and leveling knobs (8). The cross-sections of the front section of the slide rail (4) and the rear section of the slide rail (5) each have an inverted trapezoidal groove (9) on the left and right to cooperate with the linear movement of the slider along the track. At the bottom side of the proximal end of the front section of the slide rail (4), that is, the end close to the center, and at the bottom side of the left end of the rear section of the slide rail (5), there is a deep groove each, which is the same size as the blade of the hinge (6). After the blade is embedded into the groove, the M3 threaded holes on the groove correspond to the through holes of the hinge (6) one by one, and the M3 flat head screws (7) are tightened corresponding to each threaded hole to connect the front section of the slide rail (4) and the rear section of the slide rail (5), lengthening the length of the slide rail. When not in use, the hinge can fold the slide rail in half for easy folding. There are two leveling nuts located at the distal end of the front section of the slide rail (4), that is, the end far from the center of the device. The bottom of the inverted trapezoidal grooves (9) of the front section of the slide rail (4) and the rear section of the slide rail (5) is the same width as the pulley inside the slider (2).

2. The portable Y-balance intelligent testing device according to claim 1, wherein: The slider (2) is the main component for checking balance, and its structure consists of an upper cover (10), a bottom cover (11), pulleys (12) and axles (13); two axle fixing fulcrums (14) extend from the inner surface of the upper cover (10), the axles (13) pass through the two axle fixing fulcrums (14) respectively, and are press-fitted with the pulleys (12); the length of the axle (13) is equal to the center distance between the two inverted trapezoidal grooves (9) on the front section (4) and the rear section (5) of the slide rail; a pulley (12) with a radius of 20 mm is fixed at each end of each axle (13); the area where the axle (13) needs to pass through the axle fixing fulcrum (14) is polished and waxed to ensure smooth rotation between the axle (13) and the axle fixing fulcrum (14) when the pulley (12) rolls; there is a screw mounting hole (15) at each of the four corners of the upper cover (10) and the bottom cover (11), corresponding to the M3 flat head screw (7). The M3 flat head screw (7) first penetrates into the screw mounting hole (15) of the bottom cover (11) from the bottom side of the slider (2), and then is tightened with the screw mounting hole (15) of the upper cover (10); the upper cover (10) and the bottom cover (11) form a box body (16) to effectively protect the internal pulleys (12); the axles (13) and the axle fixing fulcrums (14) support the weight of the entire box body (16); in the center of the long side of the box body (16), a transparent window (17) is designed. The window (17) is designed for the slide rail (1) to pass through the slider (2). The window size is increased by 2 mm in both width and height compared to the front section (4) and the rear section (5) of the slide rail to prevent friction between the window (17) and the side wall of the slide rail (1) during the movement of the slider (2); in addition, to ensure the accuracy of laser ranging, on the long side of the box body (16), on the side facing the central standing base (3), that is, on the side consistent with the proximal measurement direction of the guide rail, a reflecting mirror surface (18) with a diameter of 3 mm is designed below the window (17). The reflecting mirror surface (18) is cut from a reflective film material and adhered to the box body (16).

3. The portable Y-balance intelligent testing device according to claim 1, wherein: The central standing base (3) is the core component of the device, and its main functions are: a. providing a single-leg standing position for the subject; b. detecting whether a part of the subject's foot is lifted up when the subject stands on one leg, and providing an alarm prompt; c. using laser ranging to detect the moving distance of the slider 2; d. connecting the slide rail (1) to further realize the convergence function of the device described in the patent; the central standing base (3) is cylindrical in shape when viewed from the outside, and includes a shell (19), a glass pressure-sensitive plate (20), and a pressure sensor (21); the shell (19) is the main structural support component of the central standing base (3), and the edge of its upper surface is designed with three outwardly protruding platforms, namely a forward platform (22), a left rearward platform (23), and a right rearward platform (24). The upper surface of the platform has a rectangular 1mm deep groove similar to the bottom side of the front section (4) and the rear section (5) of the slide rail, which is convenient for installing the hinge (6). The installation method is the same as the relevant description of the slide rail (1); the three flat The angle between the platforms (22, 23, 24) is 120°. When the subject stands, he faces the direction of the forward platform (22); and this direction is used as the reference direction. The upper surface of the shell is concave downward to form a cylindrical groove with a depth of 20 mm. There are four circular card slots (25) at the bottom of the groove surface. A pressure sensor (21) is installed in each circular card slot (25). The four circular card slots (25) are arranged in a diamond shape and are located exactly on the front, back, left and right sides of the human foot. The main function of arranging the pressure sensor (21) here is to detect whether the edge of the human foot is tilted in the Y balance test. If this happens, the reading of the pressure sensor (21) in the corresponding direction will change significantly. Threshold detection can help the subject determine whether the experimental data is valid. The lead of the power plug (26) is inserted from the side wall of the shell (19). The power plug (26) is powered by AC220V and mainly provides power for the electronic devices and circuits inside the central standing base (3).

4. The portable Y-balance intelligent testing device according to claim 3, wherein: The interior of the central standing base (3) further includes: a power supply module (27), a laser ranging module (28), a fixed cover plate (29), and a digital circuit board (30); the power supply module (27) is connected to the lead of the power plug (26), and can convert the mains electricity into DC signals of 5V and 3.3V to provide power for the normal operation of other electrical components; a small skylight (31) is respectively designed on the side wall of the housing (19) at the bottom side of each platform (22, 23, 24), and the size of the skylight (31) can just expose the lens of the laser ranging module (28), and is approximately the same height as the reflecting mirror surface (18) on the slider (2); the laser ranging module (28) is fixed by installing the fixed cover plate (29), and the fixing bolts are also M3 flat head screws (7); the digital circuit board (30) is designed in a circular shape and is fixed on the column (32) of the housing (19) by M3 flat head screws (7); the power supply module (27) and the laser ranging module (28) are respectively connected to specific interfaces of the digital circuit board (30), and the data line of the pressure sensor (21) passes through the housing (19) through the guiding hole (33) on the housing (19) and is connected to a specific interface of the digital circuit board (30).

5. The portable Y-balance intelligent testing device according to claim 1, wherein: The digital circuit board (30) mainly uses the STM32 chip to carry signal amplification and power amplifier analog modules to achieve the following functions: First, collect pressure signals and, according to the set threshold, command the buzzer to emit an alarm signal to indicate whether the standing posture of the subject's supporting leg meets the requirements of the Y-balance test; Second, collect the signals of the laser ranging module (28) and convert them into the moving distance signals of the slider (2); Third, give the measured performance score according to the performance scale saved in the memory; Fourth, transmit the data through the Wifi upper port; The analog signals measured by the 4 pressures are converted into digital signals through A / D conversion (34) and input into the pressure value detection module (35). This module presets the threshold ratio of pressure change at 20%. When the change ratio of the pressure values collected twice in a row exceeds the threshold, an instruction is sent to the sound generator (36) to generate an audio signal with a fixed frequency. Finally, the buzzer (37) converts the audio signal into sound and emits it; If the function of the buzzer (37) is activated, the pressure value detection module (35) will also send an instruction to terminate the execution of the subsequent signal processing of the laser ranging module (28). The achieved effect is: If the standing posture of the subject's supporting leg is inclined and the foot does not fully fit the glass pressure-sensitive flat plate (20), it is considered that the test data of this time is invalid, and the subject is warned by the buzzer; If the pressure value detection module (35) determines that the pressure change does not exceed the threshold, the distance digital signal output by the laser ranging module (28) will be input into the slider moving distance calculation module (38), and the actual moving distance of the slider is calculated according to the difference in the position data of the slider at the start and end of the experiment; The data of the slider moving distance calculation module 38 will be input into the test performance evaluation module (39) to estimate the score value calculated on a five-point scale; The scoring basis of the test performance evaluation module (39) is a scoring template, which is a standard template obtained by analyzing the experimental test scores of 1000 subjects and the subjective scoring data of professional scorers through a machine learning classifier, and contains a mapping database of slider moving distance and score value; The score value can be output according to the slider moving distance transmitted by the moving distance calculation module (38); Since the use of machine learning simplifies the manual scoring link, the evaluation efficiency has been improved; Finally, the data is input into the wireless transmission module (40) to batch send the data to the upper port: for further processing or visual display by programming.

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