Height and weight physical examination machine capable of achieving multi-directional automatic zeroing and zeroing method of height and weight physical examination machine

Abstract

The invention relates to the technical field of sensors, in particular to a height and weight physical examination machine capable of achieving multi-directional automatic zeroing and a zeroing method of the height and weight physical examination machine. The method comprises the steps that after a processor receives a zero returning instruction, a first process is executed, specifically, an ultrasonic probe is controlled to rotate, and a first distance sequence of the ultrasonic probe relative to an electronic scale is collected in real time; if the difference value between the first distance and the assumed height is smaller than or equal to a first set difference threshold value, the first distance at the moment is determined as a zero returning reference value of the ultrasonic sensor, and automatic zero returning is carried out; collecting a pressure value sequence of the pressure sensor in real time; a lifting device at the bottom of the electronic scale is controlled for leveling; measuring a second distance between the ground of the target side of the electronic scale and the ultrasonic probe; if the leveling is successful, the pressure value is determined as a pressure sensor zero returning reference value, and automatic zero returning is carried out; return of the ultrasonic probe and collaborative zero returning of the ultrasonic sensor and the pressure sensor are achieved.

Description

Technical Field

[0001] The present invention relates to the field of sensor technology, in particular to a multi-directional self-zeroing height and weight physical examination machine and a zeroing method thereof. Background Art

[0002] Height and weight physical examination machine is a device used to measure human height and weight, commonly found in hospitals, physical examination centers, gyms, etc. It quickly obtains data through sensors and electronic systems to help assess health status.

[0003] At present, the height measurement sensors on the height and weight examination machine include ultrasonic sensors, infrared sensors and laser sensors, and the weight measurement sensors include strain sensors, piezoelectric sensors and capacitive sensors. In addition, the height and weight examination machine is also equipped with auxiliary sensors such as temperature sensors and level sensors. The data of each sensor is aggregated to the processor to calculate the height, weight and body mass index (BMI).

[0004] Since the output of the sensor may deviate from the zero point due to long-term use or environmental changes, it is necessary to perform zero return calibration to avoid erroneous data caused by sensor deviation and affect health assessment. However, after investigation, it was found that due to the large number of sensors in the height and weight physical examination machine and the complex use environment, the existing zero return method cannot guarantee that all sensors can be effectively zeroed. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-directional self-zeroing height and weight physical examination machine and a zeroing method thereof, which realizes the return of an ultrasonic probe and the coordinated zeroing of an ultrasonic sensor and a pressure sensor.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a zeroing method for a height and weight physical examination machine with multi-directional self-zeroing, wherein the height and weight physical examination machine comprises an ultrasonic sensor for measuring height, a pressure sensor for measuring weight, and a processor; the pressure sensor is located in an electronic scale of the height and weight physical examination machine;

[0008] The method comprises:

[0009] After receiving the return-to-zero instruction, the processor executes the first process:

[0010] Controlling the rotation of the ultrasonic probe and collecting a first distance sequence of the ultrasonic probe relative to the electronic scale in real time;

[0011] If the difference between the first distance in the first distance sequence and the assumed height is less than or equal to a first set difference threshold, the first distance at this time is determined as the ultrasonic sensor zero return reference value and automatically returns to zero;

[0012] If the difference between the first distance in the first distance sequence and the assumed height is greater than the first set difference threshold, the ultrasonic probe is continuously controlled to rotate, and the comparison operation of the first distance sequence and the assumed height is returned to.

[0013] Execute the second process:

[0014] Collecting a pressure value sequence of the pressure sensor in real time;

[0015] If the pressure value sequence exceeds the set pressure threshold range, controlling the lifting device at the bottom of the electronic scale to perform leveling until the pressure value enters the set pressure threshold range;

[0016] Execute the third process:

[0017] Determine the side of the electronic scale that is lifted in the transverse direction as the target side; wherein the transverse direction is the left-right direction when the user stands on the electronic scale;

[0018] Controlling the ultrasonic probe to rotate toward the target side, and measuring a second distance between the ground on the target side of the electronic scale and the ultrasonic probe;

[0019] If the difference between the second distance and the assumed distance is less than or equal to the second set difference threshold, the leveling is successful, and the pressure value at this time is determined as the zero return reference value of the pressure sensor and automatically returns to zero;

[0020] If the difference between the second distance and the assumed distance is greater than the second set difference threshold, the lifting device at the bottom of the electronic scale is continued to be controlled for leveling to generate a new pressure value within the set pressure threshold range, and the measurement operation of the second distance is returned.

[0021] The present invention provides a multi-directional self-zeroing height and weight physical examination machine, comprising: an ultrasonic sensor for measuring height, a pressure sensor for measuring weight, and a processor;

[0022] The pressure sensor is located in the electronic scale of the height and weight physical examination machine;

[0023] The bottom of the electronic scale is provided with a plurality of lifting devices; each of the lifting devices rises or falls under the control of the processor;

[0024] The ultrasonic sensor has an ultrasonic probe, and the ultrasonic probe rotates under the control of the processor;

[0025] The processor executes a zeroing method for a height and weight physical examination machine that can autonomously return to zero in multiple directions.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention takes into account that the ultrasonic sensor of the height and weight physical examination machine may not face the electronic scale due to material deformation or long-term use and aging, resulting in inaccurate height, and designs a first process, by controlling the rotation of the ultrasonic probe and collecting the first distance sequence from the ultrasonic probe to the electronic scale in real time, so as to find the position with the shortest distance. The present invention also takes into account that the height and weight physical examination machine may be placed on a sloping ground, and designs a second process, using the characteristic that the angle of the electronic scale deviating from the horizontal will change the gravity, and preliminarily leveling the electronic scale. However, the pressure sensor has its limitations, and the gravity does not change much when the angle is small. The present invention further designs a third process, after the pressure value enters the set pressure threshold range, using a high-precision ultrasonic sensor to measure the second distance between the ground on the target side of the electronic scale and the ultrasonic probe. If the difference between the second distance and the assumed distance is small, it means that the electronic scale is level, otherwise it is necessary to return to the second process to level the electronic scale. Through the above three processes, the present invention solves the problem that the ultrasonic sensor of the height and weight physical examination machine is not facing the electronic scale and the ground is uneven due to long-term use, aging or movement, and realizes the coordinated return to zero of the ultrasonic sensor and the pressure sensor, so that the return to zero accuracy is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a structural schematic diagram of a multi-directional self-zeroing height and weight physical examination machine provided by an embodiment of the present invention;

[0030] Figure 2 It is a flow chart of a zeroing method of a height and weight physical examination machine with multi-directional self-zeroing provided by an embodiment of the present invention;

[0031] Figure 3 It is a schematic diagram of the horizontal direction of the height and weight physical examination machine provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following is a description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0033] Example 1

[0034] In order to better describe the zero-reset method provided in this embodiment, a height and weight physical examination machine to which this method is applicable is first introduced.

[0035] See also Figure 1 The height and weight physical examination machine includes an ultrasonic height measuring instrument, a main body compartment and an electronic scale. The ultrasonic height measuring instrument is located at the top of the main body compartment, and includes an ultrasonic sensor. The ultrasonic probe of the ultrasonic sensor can be rotated under the control of the processor to change the direction of emitting ultrasonic waves. The ultrasonic sensor transmits the detected distance to the processor. The electronic scale is located at the bottom of the main body compartment, and includes a pressure sensor and a support plate located above the pressure sensor. The user stands on the support plate facing the ultrasonic height measuring instrument, and the support plate transmits the user's gravity to the pressure sensor, and the pressure sensor converts the gravity into an electrical signal and transmits it to the processor. The processor and the wires are deployed in the main body compartment, and the main body compartment also has the function of connecting the ultrasonic height measuring instrument and the electronic scale. The height and weight physical examination machine is also provided with a human-computer interaction interface. The user triggers the "return to zero" function by operating the human-computer interaction interface and sends a return to zero instruction to the processor, so that the processor executes the return to zero method provided by the present invention.

[0036] In general, the main compartment is fixedly connected to the ultrasonic height measuring instrument and the electronic scale, and the ultrasonic probe is guaranteed to emit ultrasonic waves toward the center of the electronic scale (that is, the center of the user's feet when the user stands on the electronic scale) to ensure the accuracy of height detection. However, with long-term use and aging of the equipment, parts become loose and deformed, and the ultrasonic probe is no longer facing the center of the electronic scale. Based on this, the processor first executes the first process, the purpose of which is to rotate the ultrasonic probe to face the center of the electronic scale, correct the accuracy of height measurement, and provide a reference point for the subsequent rotation of the ultrasonic probe to the target side. During the entire zeroing process, the electronic scale should be kept clean and free of obstacles, and the ground around the height and weight examination machine should be flat and free of obstacles. See Figure 2 , the first process includes:

[0037] S110, controlling the ultrasonic probe to rotate, and collecting a first distance sequence between the ultrasonic probe and the electronic scale in real time.

[0038] There is a support device at the bottom of the ultrasonic probe that can rotate 360 ​​degrees. The processor sends each rotation angle to the support device to rotate the ultrasonic probe through the support device. During the rotation process, the ultrasonic probe collects the distance of the nearest obstacle detected in real time to form a first distance sequence.

[0039] S120, if the difference between the first distance in the first distance sequence and the assumed height is less than or equal to the first set difference threshold, determine the first distance at this time as the ultrasonic sensor zero return reference value and perform automatic zero return;

[0040] The assumed height is pre-stored in a non-volatile memory. When leaving the factory, the ultrasonic probe is facing the center of the electronic scale, and the first distance relative to the electronic scale detected by the ultrasonic probe is used as the assumed height. The first distance sequence is a plurality of distances measured by the ultrasonic probe at different rotation angles, and the closest distance should be the distance to the center of the electronic scale. The first set difference threshold can be determined according to the required accuracy for returning to zero, for example, 3cm. When the difference between a distance value in the first distance sequence and the assumed height is less than or equal to 3cm, it means that the ultrasonic probe is facing the center of the electronic scale, and the first distance at this time is determined as the ultrasonic sensor return to zero reference value. Subsequently, the processor automatically returns to zero according to the return to zero reference value (for example, 250cm). When the user stands on the electronic scale, it is detected that the distance above the user's head is 80cm, then 80cm is subtracted from 250cm to obtain the user's height of 170cm.

[0041] S130: If the difference between the first distance in the first distance sequence and the assumed height is greater than the first set difference threshold, continue to control the ultrasonic probe to rotate, and return to the comparison operation of the first distance sequence and the assumed height.

[0042] The present invention also takes into account that the height and weight physical examination machine may be placed on a sloped ground, and executes the second process after completing the first process, including:

[0043] S140, collecting a pressure value sequence of a pressure sensor in real time;

[0044] S150: If the pressure value sequence exceeds the set pressure threshold range, control the lifting device at the bottom of the electronic scale to perform leveling until the pressure value enters the set pressure threshold range.

[0045] When the electronic scale is placed on a slope, the gravity of the object will be decomposed into a vertical component and a parallel component, causing the gravity of the object measured by the pressure sensor to be less than the actual gravity. Using this principle, this embodiment constructs a set pressure threshold range with the real gravity of the support plate. For example, if the gravity of the support plate is 0.2N, then 0.05N is extended before and after 0.2N to obtain a set pressure threshold range of 0.15N to 0.25N. There are multiple lifting devices at the bottom of the electronic scale; each of the lifting devices rises or falls under the control of the processor. Optionally, the lifting device can be a hydraulic lifting device or a motor lifting device, which is not limited in this embodiment. For example, the electronic scale is square, and one lifting device is distributed at each edge corner, for a total of four lifting devices.

[0046] The pressure value collected at each moment is compared with the set pressure threshold range. If it is not within the set pressure threshold range, it means that the electronic scale is not level, and the processor controls the lifting device to rise or fall to level the electronic scale surface. In the actual operation process, a lifting device A is preferentially selected to rise or fall. If the pressure value gradually approaches the set pressure threshold range, it continues to rise or fall. If the pressure value gradually moves away from the set pressure threshold range, the adjustment direction is changed to control the lifting device A to fall or rise until the pressure value is closest to the set pressure threshold range. If the pressure value still cannot be controlled to the set pressure threshold range by adjusting the lifting device A, the lifting device B adjacent to the lifting device A is selected to continue adjusting, and so on, and finally the electronic scale surface is leveled by adjusting each lifting device.

[0047] The pressure sensor has its limitations, and the gravity does not change much when the slope is small. The present invention further performs the third process after completing the above second process:

[0048] S160: Determine the side of the electronic scale that is lifted in the lateral direction as the target side.

[0049] First define the horizontal direction of the electronic scale, see Figure 1 The horizontal direction is the left-right direction when the user stands on the electronic scale. The up and down adjustment of the lifting device will cause one side of the electronic scale to be lifted in the horizontal direction and the other side to be lowered. The processor decomposes the amplitude of the lifting or lowering of each lifting device under the electronic scale into the horizontal direction and converts it into the amplitude of the lifting of one side in the horizontal direction. Figure 3 , assuming that there are two lifting devices on the left and right at the bottom of the electronic scale, the lifting device on the left is raised by 5cm, and the lifting device on the right remains unchanged, then the left side is the target side.

[0050] S170, controlling the ultrasonic probe to rotate toward the target side, and measuring a second distance between the ground on the target side of the electronic scale and the ultrasonic probe.

[0051] After the first process, the ultrasonic probe has pointed to the center of the electronic scale. Then, according to the horizontal size of the electronic scale and the current first distance, the rotation angle required for the electronic scale to detect the ground on the target side is determined; the ultrasonic probe is controlled to rotate according to the rotation angle, and the second distance between the ground on the target side of the electronic scale and the ultrasonic probe is measured. In this way, the ultrasonic probe can be accurately controlled to detect the ground on the target side. Figure 3 , assuming that the lateral dimension of the electronic scale is 2b, the first distance is a, the second distance is c, and the rotation angle of the ultrasonic probe is arctan b / a.

[0052] S180, if the difference between the second distance and the assumed distance is less than or equal to the second set difference threshold, the leveling is successful, and the pressure value at this time is determined as the zero return reference value of the pressure sensor and automatically returns to zero;

[0053] S190. If the difference between the second distance and the assumed distance is greater than the second set difference threshold, continue to control the lifting device at the bottom of the electronic scale to perform leveling to generate a new pressure value within the set pressure threshold range, and return to the measurement operation of the second distance.

[0054] Assume that the distance is calculated as follows: Assume that the electronic scale is horizontal in the horizontal direction (see Figure 3 ), calculate the slope angle according to the third distance lifted by the target side and the lateral dimension of the electronic scale; and obtain the assumed horizontal distance of the electronic scale in the lateral direction according to the slope angle, the lateral dimension, the first distance and the third distance in combination with trigonometric functions.

[0055] The third distance d is the distance that the target side is actually lifted relative to the opposite side of the target side after conversion of the raising / lowering amplitude of each lifting device in the lateral direction. If the electronic scale is horizontal in the lateral direction, the slope angle m is arctan d / 2b. Assume that the distance c can be calculated by the following formula:

[0056] but

[0057] Among them, d is the third distance, 2b is the lateral dimension of the electronic scale, ∠m is the slope angle, ∠n is the angle between the electronic scale plane and the ultrasonic beam, ∠p is the angle between the ultrasonic beam and the slope, a is the first distance, and e is the oblique ultrasonic detection distance between the target side of the electronic scale and the ground. According to the sine theorem, the assumed distance c is obtained, that is, the oblique distance between the electronic scale and the ground detected by the ultrasonic wave when the electronic scale is horizontal.

[0058] If the difference between the second distance and the assumed distance c is less than or equal to the second set difference threshold (e.g., 2 cm), the leveling is successful, and the pressure value at this time is determined as the zero return reference value of the pressure sensor and automatically returns to zero. Assuming that the pressure value at this time is 0.5N, the pressure value measured after the user stands on the electronic scale is 50.5N, and the actual gravity of the user is 50N.

[0059] It should be noted that in this embodiment, the ultrasonic probe is rotated and the second distance is detected only after the "pressure value enters the set pressure threshold range" in the second process. If the difference between the second distance and the assumed distance is greater than the second set difference threshold, it means that the electronic scale is not actually leveled, and it is necessary to continue to control the lifting device at the bottom of the electronic scale for leveling. Optionally, for example, the pressure threshold range is set to 0.15N~0.25N, and the current pressure value obtained after raising the lifting device A is 0.17N. Within the set pressure threshold range, the ultrasonic probe is controlled to rotate toward the target side. The difference between the second distance and the assumed distance is greater than the second set difference threshold. The lifting device A is continued to be raised, and the current pressure value is 0.2N. Within the set pressure threshold range, the ultrasonic probe is kept unchanged. The difference between the second distance and the assumed distance is less than the second set difference threshold, and the leveling is successful. The pressure value at this time is determined as the pressure sensor zero return reference value and automatically returns to zero.

[0060] Optionally, the ultrasonic sensor zeroing reference value and the pressure sensor zeroing reference value are stored in a non-volatile memory; when the height and weight physical examination machine is started next time, the ultrasonic sensor zeroing reference value and the pressure sensor zeroing reference value are read from the non-volatile memory, and the ultrasonic sensor and pressure sensor are automatically zeroed.

[0061] Example 2

[0062] This embodiment provides a multi-directional self-zeroing height and weight physical examination machine, including: an ultrasonic sensor for measuring height, a pressure sensor for measuring weight, and a processor;

[0063] The pressure sensor is located in the electronic scale of the height and weight physical examination machine;

[0064] The bottom of the electronic scale is provided with a plurality of lifting devices; each of the lifting devices rises or falls under the control of the processor;

[0065] The ultrasonic sensor has an ultrasonic probe, and the ultrasonic probe rotates under the control of the processor;

[0066] The processor executes the zeroing method of the multi-directional autonomous zeroing height and weight physical examination machine provided in Example 1.

[0067] Optionally, the height and weight physical examination machine also includes a non-volatile memory.

[0068] Optionally, the height and weight physical examination machine also includes a temperature sensor and a humidity sensor; the processor detects the temperature and humidity in the current environment according to the temperature sensor and the humidity sensor, and corrects the ultrasonic sensor return to zero reference value and the pressure sensor return to zero reference value according to the temperature and humidity. Since temperature and humidity will affect the materials and electrical components in the ultrasonic sensor and the pressure sensor, resulting in zero drift. This embodiment has previously obtained the degree of influence of different temperatures and humidities on the zero drift of the pressure sensor and the ultrasonic sensor (i.e., the zero offset) through experiments, and a table is formulated. According to the current temperature and current humidity measured by the temperature sensor and the humidity sensor, the matching zero offset is searched in the table, and the ultrasonic sensor return to zero reference value and the pressure sensor return to zero reference value are corrected.

[0069] The present invention takes into account that the ultrasonic sensor of the height and weight physical examination machine may not face the electronic scale due to material deformation or long-term use and aging, resulting in inaccurate height, and designs a first process, by controlling the rotation of the ultrasonic probe and collecting the first distance sequence from the ultrasonic probe to the electronic scale in real time, so as to find the position with the shortest distance. The present invention also takes into account that the height and weight physical examination machine may be placed on a sloping ground, and designs a second process, using the characteristic that the angle of the electronic scale deviating from the horizontal will change the gravity, and preliminarily leveling the electronic scale. However, the pressure sensor has its limitations, and the gravity does not change much when the angle is small. The present invention further designs a third process, after the pressure value enters the set pressure threshold range, using a high-precision ultrasonic sensor to measure the second distance between the ground on the target side of the electronic scale and the ultrasonic probe. If the difference between the second distance and the assumed distance is small, it means that the electronic scale is level, otherwise it is necessary to return to the second process to level the electronic scale. Through the above three processes, the present invention solves the problem that the ultrasonic sensor of the height and weight physical examination machine is not facing the electronic scale and the ground is uneven due to long-term use, aging or movement, and realizes the coordinated return to zero of the ultrasonic sensor and the pressure sensor, so that the return to zero accuracy is higher.

[0070] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution disclosed in the present invention can be achieved, and this document does not limit this.

[0071] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for returning to zero for a height and weight physical examination machine with multi-directional self-return to zero, characterized in that: The height and weight physical examination machine comprises an ultrasonic sensor for measuring height, a pressure sensor for measuring weight and a processor; the pressure sensor is located in the electronic scale of the height and weight physical examination machine; The method comprises: After receiving the return-to-zero instruction, the processor executes the first process: Controlling the rotation of the ultrasonic probe and collecting a first distance sequence of the ultrasonic probe relative to the electronic scale in real time; If the difference between the first distance in the first distance sequence and the assumed height is less than or equal to a first set difference threshold, the first distance at this time is determined as the ultrasonic sensor zero return reference value and automatically returns to zero; If the difference between the first distance in the first distance sequence and the assumed height is greater than the first set difference threshold, the ultrasonic probe is continuously controlled to rotate, and the comparison operation of the first distance sequence and the assumed height is returned to. Execute the second process: Collecting a pressure value sequence of the pressure sensor in real time; If the pressure value sequence exceeds the set pressure threshold range, controlling the lifting device at the bottom of the electronic scale to perform leveling until the pressure value enters the set pressure threshold range; Execute the third process: Determine the side of the electronic scale that is lifted in the transverse direction as the target side; wherein the transverse direction is the left-right direction when the user stands on the electronic scale; Controlling the ultrasonic probe to rotate toward the target side, and measuring a second distance between the ground on the target side of the electronic scale and the ultrasonic probe; If the difference between the second distance and the assumed distance is less than or equal to the second set difference threshold, the leveling is successful, and the pressure value at this time is determined as the zero return reference value of the pressure sensor and automatically returns to zero; If the difference between the second distance and the assumed distance is greater than the second set difference threshold, the lifting device at the bottom of the electronic scale is continued to be controlled for leveling to generate a new pressure value within the set pressure threshold range, and the measurement operation of the second distance is returned.

2. The zeroing method of the multi-directional self-zeroing height and weight physical examination machine according to claim 1, characterized in that: If the pressure value sequence exceeds the set pressure threshold range, controlling the lifting device at the bottom of the electronic scale to level until the pressure value enters the set pressure threshold range, including: If the pressure value sequence exceeds the set pressure threshold range, at least one lifting device at the bottom of the electronic scale is controlled to rise or fall until the pressure value enters the set pressure threshold range.

3. The zeroing method of the multi-directional self-zeroing height and weight physical examination machine according to claim 2, characterized in that: Controlling the ultrasonic probe to rotate toward the target side to measure a second distance between the ground on the target side of the electronic scale and the ultrasonic probe, comprising: Determining, according to the lateral size of the electronic scale and the current first distance, a rotation angle required for the electronic scale to detect the ground on the target side; The ultrasonic probe is controlled to rotate according to the rotation angle, and a second distance between the ground on the target side of the electronic scale and the ultrasonic probe is measured.

4. The zeroing method of the multi-directional self-zeroing height and weight physical examination machine according to claim 3, characterized in that: The assumed distance is calculated in the following way: Assuming that the electronic scale is horizontal in the lateral direction, the slope angle is calculated according to the third distance raised by the target side and the lateral size of the electronic scale; According to the slope angle, the lateral size, the first distance and the third distance, in combination with trigonometric functions, an assumed horizontal distance of the electronic scale in the lateral direction is obtained.

5. The zeroing method of the multi-directional self-zeroing height and weight physical examination machine according to claim 4, characterized in that: After the third process is completed, it also includes: Storing the ultrasonic sensor zero return reference value and the pressure sensor zero return reference value in a non-volatile memory; When the height and weight physical examination machine is started next time, the ultrasonic sensor zero return reference value and the pressure sensor zero return reference value are read from the non-volatile memory, and the ultrasonic sensor and the pressure sensor are automatically returned to zero.

6. A multi-directional height and weight physical examination machine with self-reset to zero, characterized in that: include: Ultrasonic sensors for measuring height, pressure sensors and processors for measuring weight; The pressure sensor is located in the electronic scale of the height and weight physical examination machine; The bottom of the electronic scale is provided with a plurality of lifting devices; each of the lifting devices rises or falls under the control of the processor; The ultrasonic sensor has an ultrasonic probe, and the ultrasonic probe rotates under the control of the processor; The processor executes the zeroing method of the multi-directional self-zeroing height and weight physical examination machine as described in any one of claims 1 to 5.

7. The multi-directional height and weight physical examination machine with self-reset to zero according to claim 6, characterized in that: Non-volatile memory is also included.

8. The multi-directional height and weight physical examination machine with self-reset to zero according to claim 7, characterized in that: It also includes temperature and humidity sensors; The processor detects the temperature and humidity in the current environment according to the temperature sensor and the humidity sensor, and corrects the ultrasonic sensor zero return reference value and the pressure sensor zero return reference value according to the temperature and humidity.

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