A human body dynamic balance tester and test method

Abstract

A human body dynamic balance tester comprises a pressure sensor and a control host, wherein the pressure sensor is connected to the controller data in the control host, an upper plate is arranged above the control host, the pressure sensor is arranged between the upper plate and the control host, and the upper plate contacts the pressure sensor; there are multiple pressure sensors, and the distances between the multiple pressure sensors and the center line of the control host are equal, and the angles between two adjacent lines are equal, so that the measurement of the present invention is accurate; and the control host, the upper plate and the pressure sensor are integrated from top to bottom to reduce the volume, and the control host is supported by a steel structure, which is sturdy and durable; it is connected to a computer via USB and directly powered by the computer, and computer software is used to realize data analysis, so that the operation is simple and the function is powerful; the detachable structure makes its application range wider and the adjustment more flexible, and at the same time, makes its maintenance more concise and convenient, and the application range is wider.

Description

Technical Field

[0001] The invention relates to a human body dynamic balance tester. Background Art

[0002] Balance ability reflects the coordination and comprehensive ability of the human body to various stimuli such as vestibular organs, muscles, tendons, proprioceptors in joints, and vision. Maintaining balance is a prerequisite for completing multiple sports skills on ice and snow, a core indicator of athletes' physical functions, and an important dimension for building models and material selection standards. Most of the existing equipment uses the method of setting pressure sensors under the pressure plate, but the overall structure is complex, the equipment volume is too large, and the pressure sensor layout is unreasonable, and the collected information is not comprehensive enough. In addition, the existing equipment has poor flexibility, and it is not very convenient to repair and replace. Summary of the invention

[0003] Purpose of the invention:

[0004] The invention provides a human body dynamic balance tester, the purpose of which is to solve the problems existing in the past.

[0005] Technical solution:

[0006] A human body dynamic balance tester comprises a pressure sensor and a control host, wherein the pressure sensor is data-connected to a controller in the control host, an upper plate is arranged above the control host, the pressure sensor is arranged between the upper plate and the control host, and the upper plate contacts the pressure sensor;

[0007] There are multiple pressure sensors, and the distances (centers) from the center line of the control host are equal, and the angles between two adjacent lines (the lines from the center of the pressure sensor to the center of the control host) are equal.

[0008] There are eight pressure sensors, and the eight pressure sensors (centers) are equidistant from the center line (distance) of the control host, and the angles between two adjacent lines are equal (that is, uniform equiangular distribution).

[0009] The bottom of the control host is provided with a spiral adjustment support foot.

[0010] The controller in the control host is connected with a data cable.

[0011] Auxiliary alignment marks are provided on the upper surface of the upper plate to facilitate the tester to place his feet in the center.

[0012] The center of the control host is provided with a central circular groove, the side wall of the central circular groove is provided with a vertical key groove, the bottom inner wall of the central circular groove is provided with an annular groove, the diameter of the annular groove is larger than the diameter of the central circular groove (the annular groove is coaxial with the central circular groove); the vertical key groove is connected to the annular groove; the upper wall of the annular groove is symmetrically provided with two limit slots (the so-called symmetry means thatFigure 8 As shown, a straight line is connected between the two limit slots and passes through the axis of the central circular slot); the limit slot does not correspond to the vertical key slot (they are staggered up and down);

[0013] A middle cylinder is arranged at the bottom center of the upper plate. The middle cylinder is a structure that can be inserted into the central circular groove and can move up and down along the axis of the central circular groove (the diameter of the middle cylinder is adapted to the central circular groove, that is, the gap should be appropriate and not too large to prevent the middle cylinder from tilting, or it is best to be a contact dynamic fit. In order to ensure the smoothness of movement, lubricating oil can be applied to the contact part between the middle cylinder and the central circular groove); the outer wall of the middle cylinder is provided with a vertical key that can be inserted into the vertical key groove and cooperate with it (the cooperation between it and the vertical key groove is also a contact dynamic fit, that is, a contact that can move relatively, and lubricating oil can also be applied);

[0014] A rotating disk is provided at the bottom of the middle tube, and a moving column extending into the central through hole of the middle tube is provided at the center of the rotating disk. The moving column can move up and down along the axial direction of the central through hole in the central through hole (the moving column and the central through hole are in contact-type dynamic fit, and the bottom of the central through hole is closed, that is, Figure 5 As shown in the figure, the bottom opening diameter of the central through hole is smaller than the diameter of the upper part of the central through hole, and the upper diameter of the movable column is also larger than the lower part, so that the upper part of the movable column is in contact with the inner wall of the central through hole and is dynamically matched. At the same time, the movable column will not fall off from the central through hole, and the diameter of the rotating disk is also larger than the bottom opening of the central through hole. The movable column can also rotate axially in the central through hole (that is, rotate with its own axis as the axis). The side wall of the rotating disk is provided with a key that can extend into the vertical keyway and the limit slot; the center of the movable column is provided with a keyhole (the keyhole is a traditional cylindrical hole with notches on both sides of the cylindrical hole, such as Figure 6 As shown, this form is used in keyholes in many fields, similar to the keyhole on the manhole cover laid on the road);

[0015] A lifting plate is arranged at the bottom of the central circular groove, and a lifting spring is arranged at the bottom of the lifting plate.

[0016] The control unit has a recess for accommodating the pressure sensor.

[0017] The key rotating rod also includes a key rotating rod, the top of the key rotating rod is a rotating disk, and the bottom of the key rotating rod is provided with a key head that can be inserted into the key hole (the middle part of the key head is a cylinder that adapts to the middle part of the key hole, and the two sides of the key head are provided with keys that can be inserted into the notches on the side walls of the key hole. Fig.11 As shown, it is the structure of the traditional lock tongue and lock hole).

[0018] Advantages and effects:

[0019] The purpose of the present invention is to provide an eight-point star-shaped balance tester that can evaluate balance ability in view of the drawbacks of the background technology for testing the balance ability level of athletes. The present invention includes an upper plate, a pressure sensor, a control host, a spiral adjustment support foot, and a data cable. The upper plate has auxiliary alignment marks for the convenience of the tester to place the foot in the center. The pressure sensors are 8 (can also be adjusted to other numbers) and are fixed between the upper plate and the host in a star-shaped distribution. The interior of the control host is a steel structure that plays a supporting and protective role. The internal microprocessor monitors the real-time data of the pressure sensor and uploads the obtained data to the computer via the data cable in real time.

[0020] The spiral adjustment support foot has a threaded structure inside. By rotating the micro-adjustment support foot, the shaking caused by the unstable support of the tester due to uneven ground can be eliminated. The data cable is a USB interface that can be directly connected to a computer. The computer USB interface provides the power required by the tester, and the computer software is used to analyze the data.

[0021] In addition, the upper plate and the control host of the present invention adopt a detachable connection. On the one hand, when the number and position of the pressure sensors need to be adjusted, the upper plate can be removed, making its application more convenient and flexible. On the other hand, when replacing, disassembling and maintaining the pressure sensors, the upper plate can also be directly removed, making maintenance more efficient and convenient.

[0022] In summary, the advantages of the eight-point star-shaped balance tester of the present invention are: it uses pressure sensors at eight different positions for accurate measurement; and the control host, upper plate and pressure sensor are integrated from top to bottom to reduce its size, and the control host is supported by a steel structure, which is sturdy and durable; it is connected to a computer via USB and directly powered by the computer, and data analysis is achieved using computer software, which is simple to operate and powerful; the detachable structure makes its application range wider and the adjustment more flexible (for example, the pressure sensor can be adjusted to 6, 4 or 2, etc.), and at the same time, makes its maintenance simpler and more convenient, and its scope of application is wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural perspective view of the present invention;

[0024] Figure 2 It is a partial enlarged view of the present invention;

[0025] Figure 3 It is a three-dimensional schematic diagram of the appearance structure of the present invention;

[0026] Figure 4 To use the state diagram;

[0027] Figure 5is a cross-sectional view of a detachable embodiment of the present invention;

[0028] Figure 6 for Figure 5 A top view of

[0029] Figure 7 It is a cross-sectional schematic diagram of the control host;

[0030] Figure 8 for Figure 7 A top view of

[0031] Fig. 9 is a three-dimensional image of the upper plate;

[0032] Fig.10 A schematic diagram showing the structure of the central circular groove;

[0033] Fig.11 It is a structural schematic diagram of the key rotating rod;

[0034] Fig.12 A schematic diagram of another form of a limit slot;

[0035] Fig.13 To test the force principle diagram;

[0036] Figure numerals: upper plate 1, control host 2, spiral adjustment support foot spiral structure 3, support foot 4, upper plate auxiliary alignment mark 5, data line 6, pressure sensor 7. DETAILED DESCRIPTION

[0037] A human body dynamic balance tester, comprising a pressure sensor 7 and a control host 2, wherein the pressure sensor 7 is data-connected to a controller in the control host 2, and characterized in that an upper plate 1 is arranged above the control host 2, the pressure sensor 7 is arranged between the upper plate 1 and the control host 2, and the upper plate 1 is in contact with the pressure sensor 7;

[0038] There are multiple pressure sensors 7, and the distances (centers) from the center line of the control host 2 are equal, and the angles between two adjacent lines are equal.

[0039] There are eight pressure sensors 7 , and the eight pressure sensors 7 are equidistant from the center line of the control host 2 , and the angles between two adjacent lines are equal (that is, uniform equiangular distribution).

[0040] The bottom of the control host 2 is provided with a screw-type adjustment support foot 4 .

[0041] The controller in the control host 2 is connected with a data line 6 .

[0042] An auxiliary alignment mark 5 is provided on the upper surface of the upper plate 1 to facilitate the tester to place his feet in the center.

[0043] A central circular groove 2-1 is provided at the center of the control host 2, a vertical key groove 2-2 is provided on the side wall of the central circular groove 2-1 (that is, its length direction is the same as the axial direction of the central circular groove 2-1), an annular groove 2-3 is provided on the bottom inner wall of the central circular groove 2-1, and the diameter of the annular groove 2-3 is larger than the diameter of the central circular groove 2-1 (the annular groove 2-3 is coaxial with the central circular groove 2-1); the vertical key groove 2-2 is connected to the annular groove 2-3; two limit slots 2-8 are symmetrically provided on the upper wall of the annular groove 2-3 (the so-called symmetry means that Figure 8 As shown, a straight line is connected between the two limit slots 2-8 and passes through the axis of the central circular slot 2-1); the limit slot 2-8 does not correspond to the vertical key slot 2-2 (that is, they must be staggered and cannot overlap);

[0044] A middle cylinder 1-1 is arranged at the bottom center of the upper plate 1. The middle cylinder 1-1 is a structure that can be inserted into the center circular groove 2-1 and can move up and down along the axis of the center circular groove 2-1 (the diameter of the middle cylinder 1-1 is adapted to the center circular groove 2-1, that is, the gap should be appropriate and not too large to prevent the middle cylinder 1-1 from tilting, or it is best to be a contact dynamic fit. In order to ensure the smoothness of movement, lubricating oil can be applied to the contact part between the middle cylinder 1-1 and the center circular groove 2-1); the outer wall of the middle cylinder 1-1 is provided with a vertical key 1-2 that can be inserted into the vertical key groove 2-2 and cooperate with it (the cooperation between it and the vertical key groove 2-2 is also a contact dynamic fit, that is, a contact that can move relatively, and lubricating oil can also be applied to the contact part);

[0045] A rotating disk 8 is provided at the bottom of the middle tube 1-1, and a moving column 8-1 extending into the central through hole 1-1-1 of the middle tube 1-1 is provided at the center of the rotating disk 8. The moving column 8-1 can move up and down along the axial direction of the central through hole 1-1-1 in the central through hole 1-1-1 (the moving column 8-1 and the central through hole 1-1-1 are in a contact-type dynamic fit, and the bottom of the central through hole 1-1-1 is a closed setting, that is, Figure 5 As shown in the figure, the bottom opening diameter of the central through hole 1-1-1 is smaller than the diameter of the upper part of the central through hole 1-1-1, and the upper diameter of the moving column 8-1 is also larger than the lower part, so that the upper part of the moving column 8-1 is in contact with the inner wall of the central through hole 1-1-1 and is dynamically matched. At the same time, the moving column 8-1 will not fall off from the central through hole 1-1-1, and the diameter of the rotating disk 8 is also larger than the bottom opening of the central through hole 1-1-1. The moving column 8-1 can also rotate in the central through hole 1-1-1 (that is, rotate around its own axis). The side wall of the rotating disk 8 is provided with a key 8-2 that can extend into the vertical key slot 2-2 and the limit slot 2-8; the center of the moving column 8-1 is provided with a keyhole 8-1-1 (the keyhole 8-1-1 is a traditional cylindrical hole with notches on both sides of the cylindrical hole, such as Figure 6As shown, this form is used in keyholes in many fields, similar to the keyhole on the manhole cover laid on the road);

[0046] A lifting plate 2-6 is provided at the bottom of the central circular groove 2-1, and a lifting spring 2-7 is provided at the bottom of the lifting plate 2-6.

[0047] The control host 2 is provided with a groove 2 - 5 for accommodating the pressure sensor 7 .

[0048] The key rotating rod 9 is also included. The top of the key rotating rod is a rotating disk 9-1. The bottom of the key rotating rod 9 is provided with a key head 9-2 that can be inserted into the key hole 8-1-1 (the middle part of the key head is a cylinder that is adapted to the middle part of the key hole 8-1-1, and the two sides of the key head are provided with keys that can be inserted into the notches on the side walls of the key hole 8-1-1. Fig.11 As shown, it is the structure of the traditional lock tongue and lock hole).

[0049] In summary, the present invention relates to a human body dynamic balance tester, which includes an upper plate 1, a pressure sensor 7 and a control host 2; the pressure sensor 7 is arranged between the upper plate 1 and the control host 2, and the pressure sensor 7 is data connected to the controller in the control host 2; there are eight pressure sensors 7, and the eight pressure sensors 7 are equidistant from the center line of the control host 2, and the angles between two adjacent lines are equal.

[0050] The bottom of the control host 2 is provided with a spiral adjustment support foot 4. The controller in the control host 2 is connected with a data line 6. The upper surface of the upper plate 1 is provided with an auxiliary alignment mark 5 for the tester to place the foot in the center.

[0051] The upper plate is directly contacted and fixed with the pressure sensor, the pressure sensor is fixed on the control host, and the wire is designed to be hidden; a microprocessor is arranged inside the host to transmit the pressure sensor data in real time, and the pressure sensor is supported by a steel structure and the host circuit board is protected; the spiral adjustment support feet are used for leveling.

[0052] Directions:

[0053] Place the tester on the ground, use the spiral adjustment support foot 4 to level and stabilize it, connect the data cable 6 to the computer, and start the test. First, the tester needs to put his feet together and stand stably on the upper plate 1 of the tester. At this time, the computer software calculates the tester's weight (the principle of measuring weight is a well-known technology and will not be repeated here); standing with both feet can measure the body's weight, and then support with one foot. Single-leg support reflects a person's balance ability; the tester uses an auxiliary mark to place one foot as much as possible in the center of the upper plate 1 of the tester, and stands on the tester with one foot. Hold it for 30 seconds or fall off halfway if it is not held for enough time. The upper plate 1 presses down on the pressure sensor 7. The data of each pressure sensor 7 is transmitted to the computer software in real time through the data cable 6, and the software records it; the tester leaves the tester, and the software records each The data of the pressure sensor 7 is analyzed, and the influence of body weight on the test data is eliminated through an algorithm (due to the different weights of each person, the magnitude of the force generated by the shaking of the human body is also different. The weight of the subject is taken as an influencing factor into account in the subsequent force analysis and calculation, and the force measured by the sensor is multiplied by the weight correction coefficient to eliminate the influence of body weight on the test data. Taking 60kg as the standard weight, 60 is divided by the weight of the subject, and the square of the result is the weight correction coefficient), the change amplitude and change speed of each sensor data are obtained, and the data are graded to obtain the balance ability level of each tester, and then the desired result is obtained.

[0054] When the subject stands on one leg, he will shake involuntarily to maintain body balance, and the position of the body's center of gravity will change accordingly, causing the signals of the eight pressure sensors to change. The sensor signals are collected by the ADC module and communicate with the computer via USB. The eight pressure sensor signals are transmitted to the computer for processing. The computer simulates the changes in the subject's center of gravity, analyzes the frequency and amplitude of the changes in the center of gravity, and evaluates the subject's body balance ability.

[0055] like Fig.13As shown, the device collects data from pressure sensors in eight directions, namely F1, F2, F3, F4, F5, F6, F7, and F8 (these are the voltage values ​​of each pressure sensor, reflecting the pressure of each pressure sensor. F1, F2, F3, F4, F5, F6, F7, and F8 are collected in order, that is, the first one is F1, the next one is F2, and so on). Among them, F1, F3, F5, and F7 are a group of main sensors (one interval between each other), and F2, F4, F6, and F8 are a group of auxiliary correction sensors. When the human body shakes, the output values ​​of the alignment pressure sensors are subtracted (the so-called alignment means that the line connecting the two sensors is a straight line passing through the center of the plane where the sensors are located). Let X1 = F1-F5, Y1 = F7-F3, X2 = F2-F6, and Y2 = F8-F4. When X1>0, it can be determined that the center of gravity of the subject is offset to the F1 sensor side (and so on). Use X1 and Y1 to construct a two-dimensional coordinate system to describe the change of the center of gravity of the subject. Use X2 and Y2 as correction data and discard the values ​​with large deviations (calculate the sum of squares of X1, Y1 and X2, Y2 respectively and compare them. If the deviation of the two exceeds ±10% relative to the former, it is considered to be a large error and the current data is discarded. Example: A = X1 2 +Y1 2 , B=X2 2 +Y2 2 , compare A and B, that is, compare A with B. If the result of comparing A with B exceeds ±10% relative to the value of A, then discard the value of A). Since the subject stands on one foot, the frequency and amplitude of the center of gravity change are analyzed to evaluate the subject's body balance ability. Specifically, when a person stands on one foot, he will shake to adjust his center of gravity to ensure balance. This shaking is generally periodic, while the amplitude of the center of gravity change of people with strong balance ability is small and the frequency is low. The square sum of X1 and Y1 is obtained by collecting X1 and Y1, and after correction (correction is to discard data with a deviation of more than 10%), it is multiplied by the weight correction coefficient and then subjected to fast Fourier transform to obtain the spectrum function, and the peak frequency and amplitude are analyzed (by drawing a spectrum diagram, it can be directly observed.). Since there is no fixed standard for balance ability, the subjects can only be compared with each other. The frequency f and amplitude u of the peak of the spectrum function measured here, assuming that the balance ability value k = 0.3*f+u, the smaller k is, the stronger the balance ability is, and the balance ability of the subject can be evaluated.

[0056] When the upper panel 1 and the control host 2 are detachable, they should be installed before testing. Figure 5As shown, the pressure sensor 7 is first placed in the groove 2-5 of the control host 2. Generally, the inner wall shape of the groove 2-5 is adapted to the shape of the sensor to be installed, that is, after the pressure sensor is placed in the groove 2-5, the pressure sensor is just temporarily fixed by the limit position. In order to better prevent the pressure sensor from being in a series of positions or if the groove 2-5 is slightly larger or the shape is slightly inappropriate, an adhesive layer can be provided at the bottom of the groove 2-5 to prevent the pressure sensor from moving (in a series of positions);

[0057] Afterwards, take the upper plate 1, extend the lower end of the key rotating rod 9 into the keyhole 8-1-1, and extend the middle tube 1-1 into the central circular groove 2-1, so that the card key 8-2 and the vertical key 1-2 pass through the vertical key groove 2-2. When the upper plate 1 falls on the pressure sensor, press the rotating disk 9-1 downward to make the rotating disk 8 continue to move downward (at this time, the upper plate 1 does not move, and the bottom of the rotating disk 8 is closed, that is, the keyhole 8-1-1 is not a through hole, so it can support the keyhole to make the rotating disk 8 move downward), until the card key 8-2 is located in the annular groove 2-3. At this time, the lifting plate 2-6 is supported and pressed down by the rotating disk 8, and the lifting spring 2-7 is compressed. Then the rotating disk 9-1 is twisted, so that the rotating disk 8 drives the card key 8-2 to rotate in the annular groove 2-3, so that the card key 8-2 is staggered with the vertical key groove 2-2, and then the rotating disk 9-1 is released. Under the action of the upward force of 2-6, the upper surface of the card key 8-2 presses against the upper wall of the annular groove 2-3 to complete the clamping. At this time, the upper plate 1 will not fall off. Since the movable column 8-1 and the central through hole 1-1-1 can move relatively, a space for the upper plate 1 to move up and down is reserved at this time, but this space cannot be too large. It must meet the following requirements: when the user steps on the upper plate 1, the upper plate 1 can press on the pressure sensor to trigger it. If the entire device is turned upside down, even if the upper plate 1 moves down due to gravity, the pressure sensor will not fall off from between the upper plate 1 and the control host 2 (because if the upper plate moves too far, when it is inverted, the upper plate will be away from the pressure sensor. If the pressure sensor is not fixed, it will fall off from the groove 2-5. When the moving distance is small, even if the sensor moves down, it will be blocked by the upper plate).

[0058] In order to better fix the rotating disk 8, the key 8-2 can be rotated to the limit slot 2-8, so that under the action of the upward force of the lifting plate 2-6, the key 8-2 will be stuck upward in the limit slot 2-8, which will better fix the rotating disk 8. In order to better calibrate the position of the limit slot 2-8, a corresponding mark can be set on the upper plate 1, and then a corresponding mark is also set on the upper surface of the rotating disk 9-1. When the mark on the upper plate 1 corresponds to the mark on the rotating disk 9-1, the key 8-2 corresponds to the limit slot 2-8. At this time, the rotating disk 9-1 can be released so that the key 8-2 is stuck in the limit slot 2-8 (of course, other existing representation methods can also be used); in addition, in order to make the key 8-2 better extend into the position slot 2-8, the slot 2-8 can be set as follows: Fig.12 The bottom opening is wide and the top opening is narrow in a triangle shape, and the key 8-2 is in a corresponding shape, so that it is convenient to insert;

[0059] When it is necessary to adjust the pressure sensor or perform other maintenance activities, extend the lower end of the key rotating rod 9 into the keyhole 8-1-1 and press down the rotating disk 9-1, so that the card key 8-2 leaves the limit card slot 2-8, and then turn the rotating disk 9-1 to make the rotating disk 8 rotate, and the card key 8-2 rotates to the position corresponding to the vertical key slot 2-2 (the aforementioned marking method can also be used to determine the position of the card key 8-2 corresponding to the vertical key slot 2-2, that is, set another unlocking mark on the rotating disk 9-1, and set another unlocking mark on the upper plate 1. When the two marks correspond to each other, the card key 8-2 corresponds to the vertical key slot 2-2. In addition, the width of the card key 8-2, that is, as shown in Figure 5 The length perpendicular to the direction of the drawing shown can be much smaller than the width of the vertical key slot 2-2, so that the key 8-2 can pass through the vertical key slot 2-2 more flexibly). Then, release the rotating disk 9-1, and under the upward force of the lifting plate 2-6, the key 8-2 is pushed into the vertical key slot 2-2, and then lift the upper plate 1 to complete the disassembly of the upper plate.

[0060] The present invention has accurate measurement and long service life; it is directly connected to a computer and uses computer software to analyze data, and has powerful functions. It is flexible and convenient to install, disassemble and adjust, and is conducive to popularization and application.

Claims

1. A human body dynamic balance tester, comprising a pressure sensor (7) and a control host (2), wherein the pressure sensor (7) is connected to a controller in the control host (2), and characterized in that: An upper plate (1) is arranged above the control host (2), a pressure sensor (7) is arranged between the upper plate (1) and the control host (2), and the upper plate (1) is in contact with the pressure sensor (7); there are a plurality of pressure sensors (7), the distances of the plurality of pressure sensors (7) from the center line of the control host (2) are equal, and the angles between two adjacent lines are equal; The bottom of the control host (2) is provided with a screw-type adjustment support foot (4); A central circular groove (2-1) is arranged at the center of the control host (2); a vertical key groove (2-2) is arranged on the side wall of the central circular groove (2-1); an annular groove (2-3) is arranged on the bottom side wall of the central circular groove (2-1); the diameter of the annular groove (2-3) is larger than the diameter of the central circular groove (2-1); the vertical key groove (2-2) is connected to the annular groove (2-3); two limit slots (2-8) are symmetrically arranged on the upper wall of the annular groove (2-3); the limit slots (2-8) do not correspond to the vertical key groove (2-2); A middle cylinder (1-1) is arranged at the bottom center of the upper plate (1), and the middle cylinder (1-1) is a structure capable of extending into the central circular groove (2-1) and being able to move up and down along the axis of the central circular groove (2-1); a vertical key (1-2) capable of extending into and cooperating with the vertical key groove (2-2) is arranged on the outer side wall of the middle cylinder (1-1); A rotating disk (8) is arranged at the bottom of the middle tube (1-1), a moving column (8-1) extending into a central through hole (1-1-1) of the middle tube (1-1) is arranged at the center of the rotating disk (8), the moving column (8-1) can move up and down along the axis of the central through hole (1-1-1) in the central through hole (1-1-1), and the moving column (8-1) can also rotate axially in the central through hole (1-1-1), and a key (8-2) that can extend into a vertical key slot (2-2) and a limit slot (2-8) is arranged on the side wall of the rotating disk (8); a key hole (8-1-1) is arranged at the center of the moving column (8-1); A lifting plate (2-6) is arranged at the bottom of the central circular groove (2-1), and a lifting spring (2-7) is arranged at the bottom of the lifting plate (2-6).

2. A human body dynamic balance tester according to claim 1, characterized in that: There are eight pressure sensors (7), and the eight pressure sensors (7) are equidistant from a central connecting line of the control host (2), and the angles between two adjacent connecting lines are equal.

3. A human body dynamic balance tester according to claim 1, characterized in that: The control host (2) is provided with a groove (2-5) for accommodating a pressure sensor (7).

4. A human body dynamic balance tester according to claim 1 or 3, characterized in that: It also comprises a key rotating rod (9), the top of which is a second rotating disk (9-1), and the bottom of which is provided with a key head (9-2) which can be inserted into the key hole (8-1-1).

5. A method for testing human body dynamic balance using the human body dynamic balance tester as claimed in claim 1, characterized in that: The steps of this method are as follows: The first step is to measure the weight of the subject standing on the upper plate (1) with both feet, and obtain a weight correction coefficient based on the subject's weight; The second step is to stand on one foot on the upper plate (1) and collect eight data through eight pressure sensors, which are recorded as F1, F2, F3, F4, F5, F6, F7 and F8 respectively; and analyze the peak frequency and amplitude based on these data and the weight correction coefficient; The third step is to evaluate the subject's balance ability based on the peak frequency and amplitude.

6. The human body dynamic balance testing method using a human body dynamic balance testing instrument according to claim 5, characterized in that: In the first step, the process of obtaining the weight correction coefficient according to the weight of the subject is as follows: taking 60 kg as the standard weight, divide 60 by the subject's weight, and square the result to obtain the weight correction coefficient; In the second step, a group of F1, F3, F5, and F7 is the main sensor group, and a group of F2, F4, F6, and F8 is the auxiliary calibration sensor group; let X1 = F1-F5, Y1 = F7-F3, X2 = F2-F6, and Y2 = F8-F4; construct a two-dimensional coordinate system with X1 and Y1 to describe the change of the center of gravity position of the measured person, and use X2 and Y2 as calibration data; In the third step, X2 and Y2 are used as correction data for correction, and then multiplied by the weight correction coefficient, and then a fast Fourier transform is performed to obtain the spectrum function, analyze the peak frequency and amplitude, and then evaluate the balance ability of the subject based on the peak frequency and amplitude.

7. The human body dynamic balance testing method using a human body dynamic balance testing instrument according to claim 6, characterized in that: The data correction process is to calculate the sum of squares of X1, Y1 and X2, Y2 respectively, and compare them. If the deviation between the two exceeds ±10% relative to the former, it is considered to be a large error and the current data is discarded.

8. The human body dynamic balance testing method using a human body dynamic balance testing instrument according to claim 5, characterized in that: The process of evaluating the balance ability of the subject based on the peak frequency and amplitude is as follows: the frequency f and amplitude u of the peak of the spectrum function, assuming that the balance ability value k = 0.3*f+u, the smaller k is, the stronger the balance ability is, and the balance ability of the subject can be evaluated.

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