A multi-directional self-zeroing height and weight physical examination machine and its zeroing method

Abstract

The present invention relates to the field of sensor technology, and more specifically, to a multi-directional, autonomously zeroing height and weight physical examination machine and a zeroing method thereof. The method comprises: upon receiving a zeroing instruction, a processor executes a first process: controlling the rotation of an ultrasonic probe and collecting a first distance sequence of the ultrasonic probe relative to an electronic scale in real time; if the difference between the first distance and an assumed height is less than or equal to a first set difference threshold, determining the first distance at that time as a zeroing reference value for the ultrasonic sensor and performing an automatic zeroing process; collecting a pressure value sequence of the pressure sensor in real time; controlling a lifting device at the bottom of the electronic scale for leveling; measuring a second distance between the ground on the target side of the electronic scale and the ultrasonic probe; and upon successful leveling, determining the pressure value as a zeroing reference value for the pressure sensor and performing an automatic zeroing process. The present invention achieves the return of the ultrasonic probe and the coordinated zeroing of the ultrasonic sensor and the pressure sensor.

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 medical examination machine is a device used to measure a person's height and weight, commonly found in hospitals, medical examination centers, gyms, etc. It uses sensors and electronic systems to quickly obtain data to help assess health status.

[0003] Currently, height measurement sensors used in height and weight examination machines include ultrasonic, infrared, and laser sensors, while weight measurement sensors include strain gauges, piezoelectric, and capacitive sensors. In addition, these machines are equipped with auxiliary sensors such as temperature and level sensors. Data from these sensors is aggregated and fed into a processor to calculate height, weight, and body mass index (BMI).

[0004] Because sensor output may deviate from zero due to prolonged use or environmental changes, zero calibration is necessary to prevent erroneous data from sensor deviations, which could affect health assessments. However, research has shown that due to the large number of sensors in height and weight examination machines and their complex operating environments, existing zero calibration methods cannot guarantee effective zeroing of all sensors. Summary of the Invention

[0005] The purpose of the present invention is to provide a height and weight physical examination machine with multi-directional self-zeroing and a zeroing method thereof, which realizes the return of the ultrasonic probe and the coordinated zeroing of the ultrasonic sensor and the 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 between the ultrasonic probe and 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 a first set difference threshold, the ultrasonic probe is continuously controlled to rotate, and the operation of comparing the first distance sequence with 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 level until the pressure value enters the set pressure threshold range;

[0016] Execute the third process:

[0017] Determining 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 capable of autonomously returning to zero in multiple directions.

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

[0027] The present invention addresses the possibility that the ultrasonic sensor of a height and weight examination machine may not be aligned with the electronic scale due to material deformation, long-term use, or aging, leading to inaccurate height measurements. A first process is designed to control the rotation of the ultrasonic probe and collect a first distance sequence from the ultrasonic probe to the electronic scale in real time to find the closest distance. The present invention also addresses the possibility that the height and weight examination machine may be placed on a sloping surface. A second process is designed to initially level the scale by utilizing the fact that the angle at which the electronic scale deviates from horizontal will change gravity. However, pressure sensors have limitations, and gravity does not change much at small angles. Therefore, the present invention further designs a third process. After the pressure value falls within a set pressure threshold, a more accurate ultrasonic sensor is used to measure 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 small, the electronic scale is level. Otherwise, the second process is repeated to level the scale. Through these three processes, the present invention addresses the problem of the ultrasonic sensor not being aligned with the electronic scale or the uneven surface caused by long-term use, aging, or movement of the height and weight examination machine. Furthermore, the present invention achieves coordinated zeroing of the ultrasonic and pressure sensors, resulting in higher zeroing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0030] Figure 2 This is a flow chart of a zeroing method for a multi-directional, autonomously zeroing height and weight physical examination machine 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 description of exemplary embodiments of the present invention is made in conjunction with the accompanying drawings, in which various details of the embodiments of the present invention are included to facilitate understanding. These details should be considered as merely exemplary. Therefore, it should be appreciated by those skilled 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 the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0033] Example 1

[0034] In order to better describe the zero-reset method provided in this embodiment, the 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 the ultrasonic wave emission. 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. 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 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 rotation of the ultrasonic probe, and collecting a first distance sequence between the ultrasonic probe and the electronic scale in real time.

[0038] The ultrasonic probe has a 360-degree rotating support at its base. The processor transmits the rotation angles to the support, which then rotates the ultrasonic probe. During this rotation, the ultrasonic probe collects the distance to the nearest obstacle in real time, forming 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 a 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 the 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 rotation of the ultrasonic probe 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 examination machine may be placed on a sloped ground. After completing the first process, the second process is executed, including:

[0043] S140, collecting a pressure value sequence of the 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, resulting in the gravity of the object measured by the pressure sensor being less than the actual gravity. Using this principle, this embodiment constructs a set pressure threshold range based on the actual 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. The processor controls the lifting device to rise or fall to level the electronic scale surface. In actual operation, a lifting device A is selected to be raised or lowered. 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. Finally, the electronic scale surface is leveled by adjusting each lifting device.

[0047] The pressure sensor has its limitations, and when the slope is small, the gravity change is not significant. 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 horizontal 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 rise and the other side to fall in the horizontal direction. The processor decomposes the amplitude of the rise or fall of each lifting device under the electronic scale into the horizontal direction and converts it into the amplitude of the horizontal rise on one side. 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 been pointed at the center of the electronic scale. Then, based on 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 to measure the second distance between the ground on the target side of the electronic scale and the ultrasonic probe. In this way, the ultrasonic probe can be accurately controlled to detect the ground on the target side. Figure 3 , assuming that the horizontal 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 the pressure sensor is automatically returned 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 level it to generate a new pressure value within the set pressure threshold range, and return to the measurement operation of the second distance.

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

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

[0056] but

[0057] Where 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. The assumed distance c, the oblique ultrasonic distance to the ground detected when the electronic scale is horizontal, is obtained based on the law of sines.

[0058] If the difference between the second distance and the assumed distance c is less than or equal to a second set difference threshold (e.g., 2 cm), leveling is successful. The pressure value at this point is determined as the pressure sensor zeroing reference value, and an automatic zeroing process is performed. Assuming the pressure value at this point is 0.5 N, and the pressure value measured after the user stands on the electronic scale is 50.5 N, the user's actual weight is 50 N.

[0059] It should be noted that this embodiment only begins rotating the ultrasonic probe and detecting the second distance 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 has not actually been leveled, and it is necessary to continue controlling the lifting device at the bottom of the electronic scale to level it. Optionally, for example, if the pressure threshold range is set to 0.15N to 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. If 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 maintained unchanged. If the difference between the second distance and the assumed distance is less than the second set difference threshold, leveling is successful, and the pressure value at this time is determined as the pressure sensor zero reference value and automatically reset to zero.

[0060] Optionally, the ultrasonic sensor zero return reference value and the pressure sensor zero return reference value are stored 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 pressure sensor are automatically returned to zero.

[0061] Example 2

[0062] This embodiment 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;

[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 examination machine also includes a temperature sensor and a humidity sensor; the processor detects the temperature and humidity in the current environment based on the temperature sensor and the humidity sensor, and calibrates the ultrasonic sensor return to zero reference value and the pressure sensor return to zero reference value based on 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 obtains the degree of influence of different temperatures and humidity on the zero drift of the pressure sensor and the ultrasonic sensor (i.e., zero offset) through experiments in advance, and formulates a table. 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 addresses the possibility that the ultrasonic sensor of a height and weight examination machine may not be aligned with the electronic scale due to material deformation, long-term use, or aging, leading to inaccurate height measurements. A first process is designed to control the rotation of the ultrasonic probe and collect a first distance sequence from the ultrasonic probe to the electronic scale in real time to find the closest distance. The present invention also addresses the possibility that the height and weight examination machine may be placed on a sloping surface. A second process is designed to initially level the scale by utilizing the fact that the angle at which the electronic scale deviates from horizontal will change gravity. However, pressure sensors have limitations, and gravity does not change much at small angles. Therefore, the present invention further designs a third process. After the pressure value falls within a set pressure threshold, a more accurate ultrasonic sensor is used to measure 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 small, the electronic scale is level. Otherwise, the second process is repeated to level the scale. Through these three processes, the present invention addresses the problem of the ultrasonic sensor not being aligned with the electronic scale or the uneven surface caused by long-term use, aging, or movement of the height and weight examination machine. Furthermore, the present invention achieves coordinated zeroing of the ultrasonic and pressure sensors, resulting in higher zeroing accuracy.

[0070] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in the present invention can be achieved. This is not limited herein.

[0071] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A zeroing method for a multi-directional self-zeroing height and weight physical examination machine, characterized in that: The height and weight physical examination machine includes 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 of the ultrasonic sensor and collecting a first distance sequence between the ultrasonic probe and 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 a first set difference threshold, continue to control the rotation of the ultrasonic probe and return to the comparison operation of the first distance sequence and the assumed height; 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 level until the pressure value enters the set pressure threshold range; Execute the third process: Determining a side of the electronic scale that is lifted in a transverse direction as a target side; wherein the transverse direction is a left-right direction when a 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 and measuring a second distance between the ground on the target side of the electronic scale and the ultrasonic probe includes: determining, based on 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 as follows: Assuming that the electronic scale is horizontal in the transverse direction, calculating the slope angle according to the third distance raised by the target side and the transverse dimension of the electronic scale; According to the slope angle, the lateral size, the first distance and the third distance, a presumed horizontal distance of the electronic scale in the lateral direction is obtained in combination with trigonometric functions.

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, the following steps are also included: 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 automatic zero return, 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 autonomous zeroing height and weight physical examination machine according to any one of claims 1 to 5.

7. The multi-directional height and weight physical examination machine with automatic zero return according to claim 6, characterized in that: Also included is non-volatile memory.

8. The multi-directional height and weight physical examination machine with automatic zero return according to claim 7, characterized in that: 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 calibrates 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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