WO2020103535A1 - Weight scale capable of measuring values of weights at four corners, measurement apparatus and measurement method - Google Patents

Abstract

The present invention is applied in the technical field of weight scales. Provided are a weight scale capable of measuring values of weights at four corners, a measurement apparatus and a measurement method. The weight scale comprises a body and a bearing plate, wherein the body is provided with a weighing measurement apparatus; the weighing measurement apparatus comprises multiple weighing sensors arranged on the body, and an analog-digital conversion chip connected to the multiple weighing sensors; the bearing plate is located above weighing ends of the multiple weighing sensors; the weighing measurement apparatus is connected to a microprocessor; the microprocessor is arranged on the body and is used for calculating, according to multiple differential AD values, output by the analog-digital conversion chip, of the multiple weighing sensors in different states, weights respectively borne by the multiple weighing sensors using the multiple differential AD values. The degree of intelligence of a weight scale is improved, and the simplified convenient weight scale capable of measuring values of weights at four corners is provided for users.

Description

Weight scale, measuring device and measuring method capable of measuring four-corner weight value Technical field

The invention belongs to the technical field of weight scales, and particularly relates to a weight scale, a measuring device and a measuring method for measuring four-corner weight values.

Background technique

The role of the weight scale is mainly manifested in its essential use. It can accurately weigh the human body and reflect the weight control situation of a certain period of time through daily weight changes. Weight control is the basis of health management;

Most existing scales can be used for weighing measurement. With the development of the Internet of Things and the smart health industry, more and more home scales have joined the function of health measurement. In addition to the body fat and body In addition to component analysis and heart rate measurement requirements, the measurement requirements for measuring the balance of the body, such as the weight to be carried by the four corners of the weight scale, at the end of the body scale are also increasing. The existing weight scales have been unable to meet people's needs.

technical problem

The purpose of the present invention is to provide a weight scale, measuring device and measuring method capable of measuring the weight value of the four corners, aiming to solve the problem that the prior art cannot provide a weight scale that can bear the weight of the four corners of the weight scale, resulting in a low degree of intelligence of the weight scale The problem.

Technical solution

In one aspect, the present invention provides a weight scale capable of measuring a four-corner weight value, including a body and a load-bearing plate, a weight measuring device is provided on the body, and the weight measuring device includes a plurality of scales provided on the body A load cell, and an analog-to-digital conversion chip connected to a plurality of the load cells; the load-bearing plate is located above the load ends of the load cells; the load measuring device is connected to a microprocessor, so The microprocessor is disposed on the body, and is used to obtain multiple differential AD values of the multiple load cells output by the analog-to-digital conversion chip in different states, and calculate based on the multiple differential AD values The weight that each load cell bears.

On the other hand, the present invention provides a weighing measurement device, which includes a plurality of weighing sensors, an analog-to-digital conversion chip, and a reference circuit. The plurality of weighing sensors include first sensors disposed at four corners of the body, respectively. Load cell, second load cell, third load cell and fourth load cell;

The first end of the first load cell and the second load cell are both connected to the positive pole of the power supply, and the second end of the first load cell is connected to the negative pole of the power source through a first resistor. The second end of the second weighing sensor is connected to the negative electrode of the power supply through a second resistor;

The first end of the third load cell is connected to the positive pole of the power supply through a third resistor, the second end of the third load cell is connected to the negative pole of the power source, and the fourth load cell One end is connected to the positive electrode of the power supply through a fourth resistor, and the second end of the fourth load cell is connected to the negative electrode of the power supply; the reference circuit includes a fifth resistor and a sixth resistor, the fifth One end of the resistor is connected to the positive electrode of the power supply, the other end is connected to one end of the sixth resistor and the analog-to-digital conversion circuit, and the other end of the sixth resistor is connected to the negative electrode of the power supply; the first The second ends of the load cell and the second load cell are connected to the analog-to-digital conversion chip, and the first ends of the third load cell and the fourth load cell are both connected to the module Conversion chip connection.

On the other hand, the present invention provides a method for measuring the weight value of the four corners. The method includes:

Obtain multiple differential AD values of multiple load cells output by the analog-to-digital conversion chip in different states; calculate the weight that each load cell bears respectively according to the differential AD values.

Beneficial effect

The weight scale and the measuring method capable of measuring the four-corner weight value provided by the present invention calculate multiple weights by using multiple differential AD values through multiple differential AD values in different states through multiple load cells provided on the body The weights that the sensors bear respectively increase the intelligence of the scale, and provide users with a simplified and convenient scale that can measure the weight of the four corners.

BRIEF DESCRIPTION

1 is a structural example diagram of a weight scale capable of measuring a four-corner weight value provided by Embodiment 1 of the present invention;

2 is a schematic diagram of a preferred structure of a weight scale capable of measuring a four-corner weight value provided by Embodiment 1 of the present invention;

3 is a structural diagram of a weighing measurement device for a weight scale capable of measuring a four-corner weight value provided by Embodiment 2 of the present invention;

4 is a flowchart of a calibration method for a weight scale capable of measuring a four-corner weight value provided by Embodiment 3 of the present invention;

FIG. 5 is a flowchart of a method for implementing a weight scale capable of measuring four-corner weight values provided by Embodiment 4 of the present invention.

Embodiments of the invention

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not intended to limit the present invention.

The following describes the specific implementation of the present invention in detail with reference to specific embodiments:

Example one

FIG. 1 shows the structure of a weight scale capable of measuring a four-corner weight value provided by Embodiment 1 of the present invention. For ease of explanation, only the parts related to the embodiment of the present invention are shown. The details are as follows:

The weight scale capable of measuring a four-corner weight value provided by an embodiment of the present invention includes a body 1 and a load-bearing plate (not shown in the figure), a weighing measurement device 2 provided on the body 1, and the weighing measurement device 2 includes a body provided on the body 1 Multiple load cells;

As shown in FIG. 2, the multiple load cells include a first load cell S1 provided at the northeast corner of the body 1, a second load cell S2 provided at the northwest corner of the body 1, and a third load sensor S2 disposed at the southwest corner of the body 1 A load cell S3 and a fourth load cell S4 located at the southeast corner of the body 1 to measure the weight carried by different positions on the load-bearing plate; the load measuring device 2 also includes a module connected to multiple load cells Conversion chip U1, used to convert the analog signal output by the load cell into a digital signal to meet the needs of other circuits;

The main body 1 is also provided with a microprocessor U2 connected to the weighing measurement device 2 for multiple differential AD values of multiple load cells output by the analog-to-digital conversion chip U1 in different states, using multiple differential AD The value calculates the weights of multiple load cells, and then calculates the total weight of the human body according to the weights of multiple load cells;

Further preferably, the main body 1 is further provided with a display unit 3 connected to the microprocessor U2. The display unit is a 3LED display screen or an LCD display screen, and may also be an array screen module for displaying the bearing of each load cell Weight, total body weight, battery power, body balance and calibration status.

The weight scale capable of measuring the four-corner weight value provided by the present invention includes a body 1 and a load-bearing plate. The body 1 is provided with a weighing measurement device 2 which includes a plurality of weighing sensors provided on the body 1 and The analog-to-digital conversion chip U1 connected to multiple load cells; the load-bearing plate is located above the load ends of the multiple load cells; the load measuring device 2 is connected to the microprocessor U2, which is provided on the body 1, It is used to calculate the differential AD values of multiple load cells in different states according to the output of the analog-to-digital conversion chip U1, and use the multiple differential AD values to calculate the weights that the multiple load cells bear respectively, and then according to the multiple weights The weights borne by the weight sensors are used to calculate the total weight of the human body, which improves the intelligence of the scale and provides users with a simplified and convenient scale that can measure the weight of the four corners.

Example 2

FIG. 3 is a weighing measurement device for a weight scale capable of measuring a four-corner weight value provided by Embodiment 2 of the present invention. For convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows:

The weighing measurement device 2 includes a plurality of weighing sensors and an analog-to-digital conversion chip U1 and a reference circuit 4. The plurality of weighing sensors includes a first weighing sensor S1 disposed at the northeast corner of the body 1 and a first weighing sensor S1 disposed at the northwest corner of the body 1 Two weighing sensors S2, a third weighing sensor S3 disposed at the southwest corner of the body 1 and a fourth weighing sensor S4 disposed at the southeast corner of the body 1, to measure the weights the four corners of the scale weigh;

The first ends of the first load cell S1 and the second load cell S2 are both connected to the positive pole of the power supply, the second end of the first load cell S1 is connected to the first resistor R1, and the other end of the first resistor R1 is connected to the power source Connected to the negative terminal of the second load cell S2 is connected to the second end of the second resistor R2, the other end of the second resistor R2 is connected to the negative electrode of the power supply, the first end of the third load cell S3 is connected to the third resistor R3 , The other end of the third resistor R3 is connected to the positive electrode of the power supply, the second end of the third load cell S3 is connected to the negative electrode of the power supply, the first end of the fourth load cell S4 is connected to the fourth resistor R4, the fourth resistor R4 The other end of the power supply is connected to the positive electrode of the power supply, and the second end of the fourth load cell S4 is connected to the negative electrode of the power supply; that is, the two load cells are reversely linked to form a differential pair, which shows that each differential pair is The variation of the differential AD value is the sum of the variation of the differential AD values of the two load cells;

The reference circuit 4 includes a fifth resistor R5 and a sixth resistor R6. The resistance values of the fifth resistor R5 and the sixth resistor R6 are both 1K. One end of the fifth resistor R5 is connected to the positive electrode of the power supply, and the other end is connected to the sixth resistor R6 The other end of the sixth resistor R6 is connected to the negative electrode of the power supply, and the other end of the fifth resistor R5 is connected to the analog-to-digital conversion circuit U1. The reference circuit 4 is used to provide compensation for the load cell to improve the accuracy of the measurement. The circuit structure is simple ,low cost;

The multiple load cells are strain gauge pressure sensors; the second ends of the first load cell S1 and the second load cell S2 are connected to the analog-to-digital conversion chip U1, and the third load cell S3 and the fourth load cell The first end of the sensor S4 is connected to the analog-to-digital conversion chip U1; the use of strain gauge sensors to make the measurement accuracy high, wide measurement range, long life, simple structure, good frequency response characteristics, can work under harsh conditions, volume Small to reduce the overall volume of the scale.

Example three:

FIG. 4 is an implementation process of a calibration method for a weight scale capable of measuring a four-corner weight value provided by Embodiment 3 of the present invention. For ease of description, only parts related to the embodiment of the present invention are shown, including:

In step S401, linear gain coefficient matching is performed on the first load cell, the second load cell, the third load cell, and the fourth load cell to make the gain factor of each load cell very consistent; Precision.

In step S402, the first load sensor, the second load sensor, the third load sensor, the fourth load sensor and the reference circuit are connected in pairs to form a plurality of differential pairs.

In the embodiment of the present invention, the measurement signals output by the first load cell and the third load cell are set as the first differential pair, and the measurement signals output by the third load cell and the second load cell are set Set as the second differential pair, set the measurement signals output by the second load cell and the fourth load cell as the third differential pair, and set the measurement signal output by the fourth load cell and the reference output by the reference circuit The signal is set to the fourth differential pair.

In step S403, the amount of change in the differential AD value of each differential pair when the weight scale is empty and after applying a fixed mass load.

In the embodiment of the present invention, according to the formula LZ = N, the amount of change in the differential AD value of the differential pair when the weight scale is empty and after applying a fixed-mass load is obtained; where L is the difference of the differential pair when the weight scale is empty AD value, Z is the differential AD value of the differential pair after the scale is applied with a fixed mass load, and N is the variation of the differential AD value of the differential pair;

When the scale is unloaded, set the differential AD value of the first differential pair to Z1, set the differential AD value of the second differential pair to Z2, set the differential AD value of the third differential pair to Z3, and set the first The differential AD value of the four differential pairs is set to Z4;

After applying a fixed-mass load to the scale, the differential AD value of the first differential pair is set to L1, the differential AD value of the second differential pair is set to L2, and the differential AD value of the third differential pair is set to L3 , Set the differential AD value of the fourth differential pair to L4;

The change of the differential AD value of each differential pair when the scale is empty and after applying a fixed mass load are: L1-Z1 = N1; L2-Z2 = N2; L3-Z3 = N3; L4-Z4 = N4 ; Among them, N1 is the variation of the differential AD value of the first differential pair, N2 is the variation of the differential AD value of the second differential pair, N3 is the variation of the differential AD value of the third differential pair, and N4 is the fourth differential pair The amount of change in the differential AD value.

In step S404, according to the amount of change in the differential AD value of each differential pair when the scale is unloaded and after applying a fixed mass load, the amount of change in the differential AD value of each load cell is acquired.

In the embodiment of the present invention, the change amount of the differential AD value of the first load cell under no load and after applying a fixed mass load is obtained according to the formula N1-N2 + N3-N4 = VAI1, where VAI1 is the first load cell The amount of change in the differential AD value;

According to the formula N3-N4 = VAI2, obtain the change of the differential AD value of the second load cell when it is not loaded and after applying a fixed mass load, where VAI2 is the change of the differential AD value of the second load cell;

According to the formula N2-N3 + N4 = VAI3, obtain the amount of change of the differential AD value of the third load cell during no-load and after applying a fixed-mass load, where VAI3 is the amount of change of the differential AD value of the third load cell;

The variation of the differential AD value of the fourth load cell is VAI4, and VAI4 = N4.

In step S405, gain coefficients of a plurality of load cells in a calibration section where a load of a fixed mass applied to the scale is obtained.

In the embodiment of the present invention, the gain coefficients of multiple load cells in the calibration section where the load of a fixed mass applied to the weight scale is obtained according to the formula K = W ÷ (N1 + N3), where K is the multiple in the calibration section The gain coefficient of each load cell, W is the load weight of fixed mass;

Further preferably, when calibrating a weight scale that can measure a four-corner weight value, it can also be calibrated in multiple segments. The load weight of the fixed mass applied within the range of each calibration segment should be close to the maximum value calibrated in the calibration segment It can measure any value in the range of the calibration segment, and the measurement accuracy is more accurate; the more the segments, the higher the accuracy of the measurement. For example, a scale with a rated weight of 150kg, if it is calibrated at one end, only the range of 0 ~ 150kg is taken. One gain coefficient, if divided into three sections, then one section is calibrated in the range of 0 ~ 50kg, one section is calibrated in the range of 50 ~ 100kg, one section is calibrated in the range of 100 ~ 150kg, and the gain coefficients of each of the three calibration ends are different , And the more sub-segments, the narrower the calibration range used for the gain coefficient, and the higher the measurement accuracy.

Example 4:

5 is a flowchart of a method for implementing a weight scale capable of measuring a four-corner weight value provided by Embodiment 4 of the present invention. For ease of description, only parts related to the embodiment of the present invention are shown, including:

In step S501, linear gain coefficient matching is performed on the first load cell, the second load cell, the third load cell, and the fourth load cell to make the gain factor of each load cell very consistent; Precision.

In step S502, the first load cell, the second load cell, the third load cell, the fourth load cell, and the reference circuit are connected in pairs to form multiple differential pairs.

In the embodiment of the present invention, the measurement signals output by the first load cell and the third load cell are set as the first differential pair, and the measurement signals output by the third load cell and the second load cell are set Set as the second differential pair, set the measurement signals output by the second load cell and the fourth load cell as the third differential pair, connect the fourth load cell with a reference circuit, and connect the fourth load cell The output measurement signal and the reference signal output by the reference circuit are set as the fourth differential pair.

In step S503, the amount of change in the differential AD value of each differential pair when the scale is empty and after applying a fixed-mass load is obtained.

In the embodiment of the present invention, according to the formula LZ = N, the amount of change in the differential AD value of the differential pair when the weight scale is empty and after applying a fixed-mass load is obtained; where L is the difference of the differential pair when the weight scale is empty AD value, Z is the differential AD value of the differential pair after the scale is applied with a fixed mass load, and N is the variation of the differential AD value of the differential pair;

When the scale is unloaded, set the differential AD value of the first differential pair to Z1, set the differential AD value of the second differential pair to Z2, set the differential AD value of the third differential pair to Z3, and set the first The differential AD value of the four differential pairs is set to Z4;

After applying a fixed-mass load to the scale, the differential AD value of the first differential pair is set to L1, the differential AD value of the second differential pair is set to L2, and the differential AD value of the third differential pair is set to L3 , Set the differential AD value of the fourth differential pair to L4;

The change of the differential AD value of each differential pair when the scale is empty and after applying a fixed mass load are: L1-Z1 = N1; L2-Z2 = N2; L3-Z3 = N3; L4-Z4 = N4 ; Among them, N1 is the variation of the differential AD value of the first differential pair, N2 is the variation of the differential AD value of the second differential pair, N3 is the variation of the differential AD value of the third differential pair, and N4 is the fourth differential pair The amount of change in the differential AD value.

In step S504, according to the amount of change of the differential AD value of each differential pair when the weight scale is empty and after applying a fixed mass load, the amount of change of the differential AD value of each load cell is acquired.

In the embodiment of the present invention, the change amount of the differential AD value of the first load cell under no load and after applying a fixed mass load is obtained according to the formula N1-N2 + N3-N4 = VAI1, where VAI1 is the first load cell The amount of change in the differential AD value;

According to the formula N3-N4 = VAI2, obtain the change of the differential AD value of the second load cell when it is not loaded and after applying a fixed mass load, where VAI2 is the change of the differential AD value of the second load cell;

According to the formula N2-N3 + N4 = VAI3, obtain the amount of change of the differential AD value of the third load cell during no-load and after applying a fixed-mass load, where VAI3 is the amount of change of the differential AD value of the third load cell;

The variation of the differential AD value of the fourth load cell is VAI4, and VAI4 = N4.

In step S505, the gain coefficients of the plurality of load cells in the calibration section where the load of the fixed mass applied to the scale is located are obtained.

In the embodiment of the present invention, the gain coefficients of multiple load cells in the calibration section where the load of a fixed mass applied to the weight scale is obtained according to the formula K = W ÷ (N1 + N3), where K is the multiple in the calibration section The gain coefficient of each load cell, W is the load weight of fixed mass;

Further preferably, when calibrating a weight scale that can measure a four-corner weight value, it can also be calibrated in multiple segments. The load weight of the fixed mass applied within the range of each calibration segment should be close to the maximum value calibrated in the calibration segment, It can measure any value in the range of the calibration segment, and the measurement accuracy is more accurate; the more the segments, the higher the accuracy of the measurement. For example, a scale with a rated weight of 150kg, if it is calibrated at one end, only the range of 0 ~ 150kg is taken. One gain coefficient, if divided into three sections, then one section is calibrated in the range of 0 ~ 50kg, one section is calibrated in the range of 50 ~ 100kg, one section is calibrated in the range of 100 ~ 150kg, and the gain coefficients of each of the three calibration ends are different , And the more sub-segments, the narrower the calibration range used for the gain coefficient, and the higher the measurement accuracy.

In step S506, using the calibrated gain coefficient and the differential AD values of the plurality of load cells installed at different positions on the body, the weight carried by the different positions on the weighing plate is calculated.

In the embodiment of the present invention, the plurality of load sensors include a first load sensor provided at the northeast corner of the body, a second load sensor provided at the northwest corner of the body, and a third load sensor provided at the southwest corner of the body and The fourth load cell located at the southeast corner of the body; the measurement signals output by the first load cell and the third load cell are set as the first differential pair, and the third load cell and the second load cell are set The output measurement signal is set as the second differential pair, the measurement signal output by the second load cell and the fourth load cell is set as the third differential pair, and the measurement signal output by the fourth load cell is set The reference signal output from the reference circuit is set as the fourth differential pair;

According to the formula LZ = N, obtain the change of the differential AD value of the differential pair when the scale is empty and after applying a fixed mass load, where L is the differential AD value of the differential pair when the scale is empty, and Z is the scale After applying a fixed-quality load, the differential AD value of the differential pair, N is the amount of change in the differential AD value of the differential pair;

The amount of change of the differential AD value of each differential pair of the scale during no load and after the load is applied is:

L1-Z1 = N1; L2-Z2 = N2; L3-Z3 = N3; L4-Z4 = N4; where, Z1 is the differential AD value of the first differential pair when the scale is empty, and L1 is after the load is applied to the scale The differential AD value of the first differential pair, N1 is the amount of change in the differential AD value of the first differential pair; Z2 is the differential AD value of the second differential pair when the scale is empty, and L2 is the second differential after the load is applied to the scale The differential AD value of the pair, N2 is the amount of change in the differential AD value of the second differential pair; Z3 is the differential AD value of the third differential pair when the scale is unloaded, and L3 is the differential of the third differential pair after the load is applied to the scale For the AD value, N3 is the variation of the differential AD value of the third differential pair; N4 is the variation of the differential AD value of the fourth differential pair.

After the load is applied to the scale, the gain coefficients of multiple load cells within the range of the calibration segment selected based on the sum of the differential AD values of all differential pairs;

Obtain the weight carried by the first load cell according to the formula W1 = K * (N1-N2 + N3-N4), where W1 is the weight carried by the first load cell, and K is the multiple weights in the calibration end Weight sensor gain coefficient; according to the formula W2 = K * (N3-N4) to obtain the weight of the second load cell, where W2 is the weight of the second load cell; according to the formula W3 = K * (N2- N3 + N4) Get the weight of the third load cell, where W3 is the weight of the third load cell; according to the formula W4 = K * N4, get the weight of the fourth load cell, where, W4 The weight that the fourth load cell bears.

In step S507, the total weight of the human body is calculated based on the weights each of the load cells bears.

In the embodiment of the present invention, the total weight of the human body is obtained according to the formula W = W1 + W2 + W3 + W4, where W is the total weight of the human body;

Further preferably, the total weight of the human body can also be obtained according to the simplified formula W = K (N1 + N3).

The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention should be included in the protection of the present invention Within range.

Industrial applicability

The weight scale and the measuring method capable of measuring the four-corner weight value provided by the present invention calculate multiple weights by using multiple differential AD values through multiple differential AD values in different states through multiple load cells provided on the body The weights that the sensors bear respectively increase the intelligence of the scale, and provide users with a simplified and convenient scale that can measure the weight of the four corners. Therefore, it has industrial applicability.

Claims (16)

1. A weight scale capable of measuring four-corner weight value, including a body and a load-bearing plate, characterized in that a weighing measurement device is provided on the body, and the weighing measurement device includes a plurality of weighing devices provided on the body A sensor, and an analog-to-digital conversion chip connected to a plurality of the load cells; the load-bearing plate is located above the load ends of the load cells; the load measuring device is connected to a microprocessor, the The microprocessor is disposed on the body, and is used to obtain multiple differential AD values of the multiple load cells output by the analog-to-digital conversion chip in different states, and calculate each differential AD value according to the multiple differential AD values. The weights of the load cells respectively.
2. The weight scale capable of measuring the four-corner weight value according to claim 1, further comprising a display unit connected to the microprocessor, the display unit is installed on the body and used to display each The weight that the load cell bears, the total weight of the human body, the amount of battery power, the balance of the human body, and the calibration status.
3. The weight scale capable of measuring a four-corner weight value according to claim 1, wherein the body is in the shape of a rectangular parallelepiped or a cube; the plurality of the load cells include The first load cell, the second load cell, the third load cell and the fourth load cell.
4. A weighing measurement device includes a plurality of weighing sensors, an analog-to-digital conversion chip, and a reference circuit, characterized in that the plurality of weighing sensors include first weighing sensors respectively provided at four corners of the body, The second load cell, the third load cell and the fourth load cell;

   The first end of the first load cell and the second load cell are both connected to the positive pole of the power supply, and the second end of the first load cell is connected to the negative pole of the power source through a first resistor. The second end of the second weighing sensor is connected to the negative electrode of the power supply through a second resistor;

   The first end of the third load cell is connected to the positive pole of the power supply through a third resistor, the second end of the third load cell is connected to the negative pole of the power source, and the fourth load cell One end is connected to the positive electrode of the power supply through a fourth resistor, and the second end of the fourth load cell is connected to the negative electrode of the power supply; the reference circuit includes a fifth resistor and a sixth resistor, the fifth One end of the resistor is connected to the positive electrode of the power supply, the other end is connected to one end of the sixth resistor and the analog-to-digital conversion circuit, and the other end of the sixth resistor is connected to the negative electrode of the power supply; the first The second ends of the load cell and the second load cell are connected to the analog-to-digital conversion chip, and the first ends of the third load cell and the fourth load cell are both connected to the module Conversion chip connection.
5. The weighing measurement device according to claim 4, wherein the plurality of weighing sensors are all strain gauge pressure sensors.
6. A method for measuring the weight value of the four corners, characterized in that it includes:

   Obtain multiple differential AD values of multiple load cells output by the analog-to-digital conversion chip in different states;

   According to the differential AD value, calculate the weight that each load cell bears.
7. The method for measuring a quadrangular weight value according to claim 6, characterized in that, before acquiring multiple differential AD values of the multiple load cells output by the analog-to-digital conversion chip in different states, the method further includes Describe the steps of the scale;

   The step of calibrating the weight scale includes:

   According to the formula LZ = N, obtain the amount of change of the differential AD value of the differential pair when the weight scale is empty and after applying a fixed mass load, where L is the differential AD value of the differential pair when the weight scale is empty, and Z is The differential AD value of the differential pair after applying a fixed mass load to the scale, N is the amount of change in the differential AD value of the differential pair;

   According to the amount of change of the differential AD value of each differential pair of the weighing scale under no load and after applying a fixed-mass load, the amount of change of the differential AD value of each load cell is acquired.
8. The method for measuring a quadrangular weight value according to claim 7, wherein the acquiring the change amount of the differential AD value of the differential pair of the weighing scale when the scale is empty and after applying a fixed mass load includes:

   Setting the differential AD value of the first differential pair to Z1, the differential AD value of the second differential pair to Z2, and the differential AD value of the third differential pair to Z3 when the scale is unloaded; Set the differential AD value of the fourth differential pair to Z4;

   The differential AD value of the first differential pair after applying a fixed mass load to the scale is set to L1, the differential AD value of the second differential pair is set to L2, and the differential AD value of the third differential pair is set For L3, set the differential AD value of the fourth differential pair to L4;

   The amount of change of the differential AD value of each differential pair of the weighing scale during no-load and after applying a fixed-mass load is:

   L1-Z1 = N1; L2-Z2 = N2; L3-Z3 = N3; L4-Z4 = N4; where N1 is the amount of change in the differential AD value of the first differential pair, and N2 is the second differential pair N3 is the amount of change in the differential AD value of the third differential pair, and N4 is the amount of change in the differential AD value of the third differential pair, and N4 is the amount of change in the differential AD value of the fourth differential pair.
9. The method for measuring the four-corner weight value according to claim 8, wherein the acquiring the variation of the differential AD value of each load cell includes:

   According to the formula N1-N2 + N3-N4 = VAI1, obtain the amount of change in the differential AD value of the first load cell during no-load and after applying a fixed-mass load, where VAI1 is the difference of the first load cell Change in AD value;

   According to the formula N3-N4 = VAI2, obtain the amount of change of the differential AD value of the second load cell during no-load and after applying a fixed-mass load, where VAI2 is the change of the differential AD value of the second load cell the amount;

   According to the formula N2-N3 + N4 = VAI3, obtain the amount of change of the differential AD value of the third load cell during no-load and after applying a fixed mass load, where VAI3 is the differential AD value of the third load cell The amount of change

   The variation of the differential AD value of the fourth load cell is VAI4, and VAI4 = N4.
10. The method for measuring a quadrangular weight value according to claim 7, wherein after the step of calibrating the weight scale, the method further comprises: performing linear gain coefficient matching on the plurality of load cells.
11. The method for measuring a quadrangular weight value according to claim 10, wherein the linear gain coefficient matching of the plurality of load cells includes:

    According to the formula K = W ÷ (N1 + N3), calculate the gain coefficients of the plurality of load cells in the calibration section where the load of a fixed mass applied to the weight scale is located, where K is the plurality of load cells in the calibration section The gain coefficient of the load cell, W is the load weight of a fixed mass.
12. The method of measuring a weight scale according to any one of claims 7-11, characterized in that, when calibrating the weight scale, the method further includes calibrating in multiple stages, which are applied within the range of each calibration stage The load weight of the fixed mass is close to the maximum value calibrated in the calibration section.
13. The method of claim 6, wherein the weight scale capable of measuring the four-corner weight value, the acquiring multiple differential AD values of the multiple load cells output by the analog-to-digital conversion chip in different states includes:

    The measurement signals output by the first load cell and the third load sensor are set as the first differential pair, and the measurement signals output by the third load cell and the second load sensor are set as the second differential pair, The measurement signals output by the second load cell and the fourth load sensor are set as the third differential pair, and the measurement signals output by the fourth load cell and the reference signal output by the reference circuit are set to the fourth Differential pair

    According to the formula LZ = N, obtain the change of the differential AD value of each differential pair of the scale when it is unloaded and after the load is applied, where L is the differential AD value of the differential pair when the scale is unloaded, and Z is The differential AD value of the differential pair after the load is applied by the scale, and N is the amount of change in the differential AD value of the differential pair.
14. The method for measuring a quadrangular weight value according to claim 13, wherein the amount of change in the differential AD value of each differential pair of the weight scale during no-load and after the load is applied is:

    L1-Z1 = N1; L2-Z2 = N2; L3-Z3 = N3; L4-Z4 = N4; where, Z1 is the differential AD value of the first differential pair when the scale is unloaded, and L1 is the weight After the scale is loaded, the differential AD value of the first differential pair, N1 is the amount of change in the differential AD value of the first differential pair; Z2 is the differential AD value of the second differential pair when the scale is empty, and L2 is the pair The differential AD value of the second differential pair after the load is applied to the scale, N2 is the amount of change in the differential AD value of the second differential pair; Z3 is the differential AD value of the third differential pair when the scale is unloaded, L3 is the differential AD value of the third differential pair after the load is applied to the scale, N3 is the variation of the differential AD value of the third differential pair; N4 is the variation of the differential AD value of the fourth differential pair .
15. The method for measuring the four-corner weight value according to claim 6, characterized in that the calculation of the weight that each load cell bears respectively according to the differential AD value includes:

    According to the formula W1 = K * (N1-N2 + N3-N4), calculate the weight that the first load cell bears;

    According to the formula W2 = K * (N3-N4), calculate the weight that the second load cell bears;

    According to the formula W3 = K * (N2-N3 + N4), calculate the weight that the third load cell bears;

    According to the formula W4 = K * N4, calculate the weight that the fourth load cell bears;

    Where K represents the gain coefficients of the plurality of load cells in the calibration section, W1 represents the weight carried by the first load cell, W2 represents the weight carried by the second load cell, and W3 represents the first The weight carried by the three load cells, W4 represents the weight carried by the fourth load cell, N1 represents the amount of change in the differential AD value of the first differential pair, and N2 represents the amount of change in the differential AD value of the second differential pair , N3 represents the amount of change in the differential AD value of the third differential pair, and N4 represents the amount of change in the differential AD value of the fourth differential pair.
16. The method for measuring the four-corner weight value according to claim 15, wherein after calculating the weight that each load cell bears respectively according to the differential AD value, the method further comprises:

    Calculate the total weight of the human body according to the formula W = W1 + W2 + W3 + W4,

    Or, calculate the total weight of the human body according to the formula W = K (N1 + N3);

    Among them, W is the total weight of the human body.