CN114935390A - Weighing force-measuring sensor for unbalance loading error compensation - Google Patents

Abstract

The invention belongs to the field of sensor control, and provides a weighing and force-measuring sensor for unbalance loading error compensation, which comprises a shell and an induction circuit, wherein the induction circuit comprises a first circuit, a second circuit, a third circuit, a fourth circuit and a reference circuit, wherein the first circuit, the second circuit, the third circuit, the fourth circuit and the reference circuit are respectively provided with a measuring piece; one end of the first circuit is connected with a first signal, one end of the second circuit is connected with a second signal, one end of the third circuit is connected with a third signal, one end of the fourth circuit is connected with a fourth signal, and one end of the reference circuit is connected with a reference signal; the other end of the first circuit, the other end of the second circuit, the other end of the third circuit and the other end of the fourth circuit are connected with the other end of the reference circuit and then grounded; the first circuit, the second circuit, the third circuit and the fourth circuit at least sense the pressure of two different strain areas, and the reference circuit senses the pressure of a non-strain area of the shell; the reference signal forms differential signals with the first signal, the second signal, the third signal and the fourth signal respectively.

Description

A weighing load cell for eccentric load error compensation

technical field

The invention belongs to the field of sensor control, and in particular relates to a weighing force measuring sensor for eccentric load error compensation.

Background technique

The resistance strain sensor is a resistance sensor that converts the force value into a voltage signal through the resistance strain gauge and the elastic element as the conversion element. This type of sensor is widely used in the field of weighing force sensor due to its high precision, wide measurement range, long life and simple structure.

In actual use, the load cell is installed under the weighing platform. When objects are loaded at different positions on the weighing platform, the force on the load cell is different, so an eccentric load error occurs. In order to correct the eccentric load error of the weighing equipment, people realize the eccentric load correction of the weighing equipment by adjusting the correction coefficient of the sensor. For multi-sensor weighing equipment, the eccentric load error correction is realized by adjusting the correction coefficients associated with each out. For weighing equipment with a single sensor, the eccentric load error correction is generally achieved by filing the wall thickness of the elastic element strain beam of the load cell with a file. When repairing the setback, it completely relies on the production experience of the operator, and the technical requirements for the staff's setback are relatively high, which is time-consuming and labor-intensive, and this method is limited to the weighing load cell of the parallel beam structure, which has many advantages in meeting practical application requirements. limitation.

With the increase of production cost and the increasing demand for sensor intelligence, how to improve production efficiency, shorten the production cycle, and simplify the correction of the eccentric load error of the weighing force sensor is a major challenge for the current weighing force sensor manufacturers. .

SUMMARY OF THE INVENTION

The invention provides a weighing force measuring sensor for compensating eccentric load error, which is used to solve the problem of eccentric load error that occurs in the prior art when a single weighing force measuring sensor directly adopts a Wheatstone bridge.

The basic scheme of the present invention is: a weighing load cell for eccentric load error compensation, comprising a casing and an induction circuit, the casing is elastic, and the induction circuit includes: a first circuit, a second circuit, a third circuit, the fourth circuit and the reference circuit; the first circuit, the second circuit, the third circuit, the fourth circuit and the reference circuit are all provided with measuring parts;

One end of the first circuit is connected to the first signal, one end of the second circuit is connected to the second signal, one end of the third circuit is connected to the third signal, one end of the fourth circuit is connected to the fourth signal, and one end of the reference circuit is connected to the reference signal; The other end of the circuit, the other end of the second circuit, the other end of the third circuit and the other end of the fourth circuit are all connected to the other end of the reference circuit, and then grounded;

The first circuit and the third circuit sense the same strain area of the load cell housing, the second strain area and the fourth strain area sense the same strain area of the load cell housing, the first circuit, The second circuit senses different strained regions of the load cell housing, and the reference circuit senses the unstrained regions of the shell; the reference signal is associated with the first, second, third and fourth signals, respectively. The signals all constitute differential signals.

Further, the ground terminal of the first circuit, the ground terminal of the second circuit, the ground terminal of the third circuit and the ground terminal of the fourth circuit are connected to the same ground port, and the ground port is connected to the reference circuit and then grounded.

Further, the ground terminal of the first circuit and the ground terminal of the fourth circuit are connected to the same first ground port, the ground terminal of the second circuit and the ground terminal of the third circuit are connected to the same second ground port, and the first ground port and the third circuit are connected to the same second ground port. The two grounding ports are respectively connected to the reference grounding port of the reference circuit through wires, the reference grounding port is grounded, and the first grounding port and the second grounding port are different ports.

Further, the first circuit and the third circuit sense the pressure of the compressive strain area of the casing of the load cell, and the second circuit and the fourth circuit sense the tensile force of the tensile strain area of the casing of the load cell.

Further, the first signal, the second signal, the third signal, the fourth signal and the reference signal are all constant current excitation.

Further, the measuring elements in the first circuit, the second circuit, the third circuit and the fourth circuit include at least one strain gauge, and the measuring elements in the reference circuit include at least one strain gauge or resistance.

Further, the housing also includes an elastic base, one side of the base is provided with a measurement cavity, and the other side of the base is provided with a PCB board; the side of the top of the base close to the measurement cavity is provided with a load-bearing The side of the top of the base close to the PCB board is provided with a fixing part; the measuring element is a strain gauge, and the strain gauge is distributed in the measuring cavity.

Further, the strain gauges in the first circuit, the second circuit, the third circuit and the fourth circuit are uniformly and symmetrically distributed in the circumferential direction in the measurement cavity, and the strain gauges in the reference circuit are installed on the non-contact parts of the measurement cavity. strain area.

Further, the PCB board includes a data processing unit, a data acquisition unit, a storage unit and an output unit;

The data collection unit collects the first differential voltage signal between the first signal and the reference signal, collects the second differential voltage signal between the second signal and the reference signal, and collects the third signal between the third signal and the reference signal. Differential voltage signal, collect the fourth differential voltage signal between the fourth signal and the reference signal, and send the first differential voltage signal, the second differential voltage signal, the third differential voltage signal and the fourth differential voltage signal to data processing unit;

the storage unit for storing the first angular difference coefficient of the first circuit, the second angular difference coefficient of the second circuit, the third angular difference coefficient of the third circuit and the fourth angular difference coefficient of the fourth circuit ;

The data processing unit is configured to combine the first differential voltage signal sent by the data acquisition unit, The second differential voltage signal, the third differential voltage signal and the fourth differential voltage signal are calculated to obtain weighing result information;

The output unit is used for outputting the weighing result information sent by the data processing unit.

Further, the PCB board also includes an input module and a preprocessing module;

The input module is used to input current loading weight information and current loading position information;

The preprocessing module is configured to combine the current loading weight input by the input module according to the first differential voltage signal, the second differential voltage signal, the third differential voltage signal and the fourth differential voltage signal sent by the data acquisition unit information and the current loading position information, calculate the first angular difference coefficient of the first circuit, the second angular difference coefficient of the second circuit, the third angular difference coefficient of the third circuit and the fourth angular difference coefficient of the fourth circuit , and send it to the storage module for storage.

In this scheme, the reference circuit is used to measure the differential signal between each circuit and the reference circuit, and through these differential signals, the deviation of the weighing load cell at each position can be known, and then the final output value of the weighing load cell can be adjusted easily. On the basis of the existing weighing load cell, it is convenient to eliminate the influence of multiple different angles on the output value by setting multiple differential signals, and then realize the specific eccentric load error compensation through the PCB board. A number of cross coefficients and measured values are used to calculate the error compensation, and finally the output value after the eccentric load error compensation is obtained.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts. The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, and only illustrates the basic structure of the present invention in a schematic manner, so it only shows the structure related to the present invention.

Fig. 1 is the circuit structure diagram of the weighing load cell mentioned in the background technology;

FIG. 2 is a schematic circuit diagram of an embodiment of a weighing load cell for eccentric load error compensation according to the present invention;

3 is a schematic circuit diagram of an embodiment of a weighing load cell for eccentric load error compensation according to the present invention;

4 is a structural diagram of a weighing force sensor according to an embodiment of a weighing force sensor for eccentric load error compensation according to the present invention;

5 is a schematic diagram of a module of a PCB board in a weighing force sensor according to an embodiment of a weighing force sensor for eccentric load error compensation according to the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of them. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

A weighing force sensor for eccentric load error compensation provided by the present invention, as shown in Figures 2 and 3, includes a casing and an induction circuit, the casing is elastic, and the induction circuit includes: a first circuit, a second circuit The circuit, the third circuit, the fourth circuit and the reference circuit; the first circuit, the second circuit, the third circuit, the fourth circuit and the reference circuit are all provided with measuring parts.

The upper end of the first circuit is connected to the first signal SIG_1, the upper end of the second circuit is connected to the second signal SIG_2, the lower end of the third circuit is connected to the third signal SIG_3, the lower end of the fourth circuit is connected to the fourth signal SIG_4, and the upper end of the reference circuit is connected to the reference Signal SIG_0; the lower end of the first circuit, the lower end of the second circuit, the upper end of the third circuit, and the upper end of the fourth circuit are all connected to the lower end of the reference circuit, and then grounded to GND.

The first circuit and the third circuit sense the same strain area of the load cell housing, the second strain area and the fourth strain area sense the same strain area of the load cell housing, the first circuit, The second circuit senses different strain regions of the load cell housing, and the measuring element of the reference circuit senses the non-strain regions of the shell; the reference signal SIG_0 is respectively associated with the first signal SIG_1, the second signal SIG_2, Both the third signal SIG_3 and the fourth signal SIG_4 constitute a differential signal. Wherein, the measuring element of the reference circuit senses the tensile force and pressure in the non-strain area of the housing, and the non-strain area, ie the zero-strain area, has almost no strain change in the area when the load is loaded.

In some examples, as shown in FIG. 2 , the ground terminal of the first circuit, the ground terminal of the second circuit, the ground terminal of the third circuit, and the ground terminal of the fourth circuit are connected to the same ground port, and the ground port is connected with all The reference circuit is connected to ground GND.

In some examples, as shown in FIG. 3 , the ground terminal of the first circuit and the ground terminal of the fourth circuit are connected to the same first ground port, and the ground terminal of the second circuit and the ground terminal of the third circuit are connected to the same second terminal The grounding port, the first grounding port and the second grounding port are respectively connected to the reference grounding port of the reference circuit through wires, the reference grounding port is grounded, and the first grounding port and the second grounding port are different ports.

In some examples, the first and third circuits sense pressure in a compressive strain region of the load cell housing, and the second and fourth circuits sense a tensile strain region of the load cell housing pulling force.

In some examples, as shown in FIG. 2 and FIG. 3 , the first signal SIG_1 , the second signal SIG_2 , the third signal SIG_3 , the fourth signal SIG_4 and the reference signal SIG_0 are all constant current excitation, and the added constant excitation current range between 0.2mA and 17mA.

In some examples, the measurement elements include strain gauges and/or resistances, each measurement element includes at least one strain gauge or resistance, and at least one measurement element includes a strain gauge. That is to say, in the load-bearing sensor, all measuring elements are not allowed to be resistors, or all measuring elements are composed of multiple resistors.

Specifically, the measuring pieces are respectively a first measuring piece G1, a second measuring piece G2, a third measuring piece G3, a fourth measuring piece G4 and a reference measuring piece G0. In addition, the first measuring piece G1, the second measuring piece G2, the third measuring piece G3 and the fourth measuring piece G4 all include one or more strain gauges, and the reference measuring piece G0 may be composed of a single resistor or a plurality of strain gauges. It is composed of a resistor, or it is composed of a strain gage, or a plurality of strain gages, or it is composed of a strain gage and a resistor. In some examples, the first measuring piece G1 , the second measuring piece G2 , the third measuring piece G3 and the fourth measuring piece G4 may also be configured as a circuit structure composed of a strain gauge and a resistor.

In some examples, as shown in FIG. 4 , the housing further includes an elastic base 1, one side of the base 1 is provided with a measurement cavity 2, and the other side of the base 1 is provided with a PCB board 3; the The side of the top of the base 1 close to the measurement cavity 2 is provided with a load-bearing part 4, and the side of the top of the base 1 close to the PCB board 3 is provided with a fixed part 5; the measurement components are all strain gauges, and all strain gauges are distributed in the in the measuring chamber.

Further, in the first circuit connected to the first signal SIG_1, the second circuit connected to the second signal SIG_2, the third circuit connected to the third signal SIG_3, and the fourth circuit connected to the fourth signal SIG_4, the strain gauge In the measuring cavity 2, it is distributed evenly and symmetrically in the circumferential direction. The measuring pieces where the strain gauges of the first circuit and the third circuit are located sense the pressure in the compressive strain area of the housing, and the measuring pieces where the strain gauges of the second circuit and the fourth circuit are located sense the housing. The tensile force of the tensile strain area; in the reference circuit connected to the reference signal SIG_0 , the measuring element where the strain gauge is located is installed in the non-strain area of the measuring cavity 2 .

In some examples, as shown in FIG. 5 , the PCB board 3 includes a data processing unit 33 , a data acquisition unit 31 , a storage unit 32 and an output unit 34 .

The data collection unit 31 collects the first differential voltage signal V1 between the first signal SIG_1 and the reference signal SIG_0, collects the second differential voltage signal V2 between the second signal SIG_2 and the reference signal SIG_0, and collects the third signal SIG_3 and the third differential voltage signal V3 between the reference signal SIG_0, collect the fourth differential voltage signal V4 between the fourth signal SIG_4 and the reference signal SIG_0, and combine the first differential voltage signal V1, second differential voltage signal V2, Both the third differential voltage signal V3 and the fourth differential voltage signal V4 are sent to the data processing unit 33;

The storage unit 32 is used to store the first angular difference coefficient a of the first circuit, the second angular difference coefficient b of the second circuit, the third angular difference coefficient c of the third circuit, and the fourth angular difference coefficient of the fourth circuit. Four corner difference coefficient d;

The data processing unit 33 is configured to send the data in combination with the data acquisition unit 31 according to the first angular difference coefficient a, the second angular difference coefficient b, the third angular difference coefficient c and the fourth angular difference coefficient d in the storage unit 32 The first differential voltage signal V1, the second differential voltage signal V2, the third differential voltage signal V3 and the fourth differential voltage signal V4 are calculated to obtain the weighing result information;

The output unit 34 is configured to output the weighing result information sent by the data processing unit 33 .

Further, the PCB board 3 further includes an input module 35 and a preprocessing module 36 . The input module 35 is used to input current loading weight information and current loading position information; the preprocessing module 36 is used to input the first differential voltage signal V1 and the second differential voltage signal V2 sent by the data acquisition unit 31 , the third differential voltage signal V3 and the fourth differential voltage signal V4, combined with the current loading weight information and the current loading position information input by the input module 35, the first angular difference coefficient a of the first circuit, the The second angular difference coefficient b of the second circuit, the third angular difference coefficient c of the third circuit, and the fourth angular difference coefficient d of the fourth circuit are sent to the storage module 32 for storage.

Specifically, during implementation, the angular difference coefficient of each circuit is calculated by the preprocessing module 36 . Take four measurement circuits as an example, including the following steps:

S1, the external force of the load-bearing part 4 of the casing is applied as 0 (F=0), the zero-point output of each differential voltage signal is obtained respectively, the zero-point output of the first differential voltage signal V1 is V1_0, the zero-point output of the second differential voltage signal V2 is V2_0, The zero point output of the third differential voltage signal V3 is V3_0, and the zero point output of the fourth differential voltage signal V4 is V4_0.

S2, load a weight of known weight on the center of the test table, obtain the first group output of each differential voltage signal and subtract the zero point output to obtain V1_1~V4_1, specifically, the first differential voltage signal V1 obtained by testing and the zero point Output the difference V1_1 between V1_0, test the difference V2_1 between the second differential voltage signal V2 and the zero point output V2_0, test the difference V3_1 between the third differential voltage signal V3 and the zero point output V3_0, test The difference V4_1 between the obtained fourth differential voltage signal V4 and the zero point output V4_0.

S3, load a weight of known weight on the first corner of the test table, obtain the second group output of each differential voltage signal and subtract the zero point output to obtain V1_2~V4_2, specifically, the first differential voltage obtained by testing The difference V1_2 between the signal V1 and the zero-point output V1_0, the difference V2_2 between the second differential voltage signal V2 obtained by testing and the zero-point output V2_0, and the difference between the third differential voltage signal V3 and the zero-point output V3_0 obtained by testing The value V3_2 is the difference V4_2 between the fourth differential voltage signal V4 obtained by testing and the zero point output V4_0.

S4, load a weight of known weight on the second corner of the test table, obtain the second group output of each differential voltage signal and subtract the zero point output to obtain V1_3~V4_3, specifically, the first differential voltage obtained by testing The difference V1_3 between the signal V1 and the zero point output V1_0, the difference V2_3 between the second differential voltage signal V2 and the zero point output V2_0 obtained by testing, the difference between the third differential voltage signal V3 and the zero point output V3_0 obtained by testing The value V3_3 is the difference V4_3 between the fourth differential voltage signal V4 obtained by testing and the zero point output V4_0.

S5, load a weight of known weight on the third corner of the test table, obtain the second group output of each differential voltage signal and subtract the zero output to obtain V1_4~V4_4, specifically, the first differential voltage obtained by testing The difference V1_4 between the signal V1 and the zero-point output V1_0, the difference V2_4 between the second differential voltage signal V2 and the zero-point output V2_0 obtained by testing, and the difference between the third differential voltage signal V3 and the zero-point output V3_0 obtained by testing The value V3_4 is the difference V4_4 between the fourth differential voltage signal V4 obtained by testing and the zero point output V4_0.

S6, solve the following equation to obtain the angular difference coefficients a, b, c, d of each strain gauge,

S7, compare the first angular difference coefficient a of the first circuit, the second angular difference coefficient b of the second circuit, the third angular difference coefficient c of the third circuit, and the fourth angular difference coefficient of the fourth circuit obtained in S6 The coefficient d is sent to the storage module 32 for storage.

In addition, the data processing unit 33 combines the first angular difference coefficient a, the second angular difference coefficient b, the third angular difference coefficient c and the fourth angular difference coefficient d in the storage unit 32 with the first angular difference coefficient sent by the data acquisition unit 31 The differential voltage signal V1, the second differential voltage signal V2, the third differential voltage signal V3, and the fourth differential voltage signal V4 are calculated to obtain the weighing result information, that is, the sensor output value V0; the calculation process is as follows: V0=aV1′+bV2 '+cV3'+dV4'. Among them, V1'~V4' are the values of V1~V4 after AD conversion.

In this case, a star circuit is used. When working, the common terminals of the first circuit, the second circuit, the third circuit and the fourth circuit in the star circuit are directly or indirectly grounded, and the circuit is preferably a constant current. The excitation replaces the original constant voltage excitation, which solves the problem that in the traditional design of the strain gauge under different electric field strengths, the measured resistance value of the strain gauge under high voltage is larger than the actual resistance value, resulting in the instability of the weighing sensor. It reduces the drift problem of the strain gauge measurement bridge and improves the EMC immunity of the input, thereby ensuring the accuracy and stability of the sensor. At the same time, the eccentric load error compensation is realized without increasing the number of bridges, and the cost increase is small; in the production and manufacturing ring, labor links such as mechanical grinding are saved, which saves labor, and does not need to increase the measurement of the relationship between the center of gravity and the angle difference And record the process, improve the production efficiency.

The above are only the embodiments of the present invention, and the common knowledge such as the well-known specific structures and characteristics in the scheme has not been described too much here. Those of ordinary skill in the art know that the invention belongs to the technical field before the filing date or the priority date. Technical knowledge, can know all the prior art in this field, and have the ability to apply conventional experimental means before the date, those of ordinary skill in the art can improve and implement this scheme in combination with their own ability under the enlightenment given in this application, Some typical well-known structures or well-known methods should not be an obstacle to those skilled in the art from practicing the present application. It should be pointed out that for those skilled in the art, some modifications and improvements can be made without departing from the structure of the present invention. These should also be regarded as the protection scope of the present invention, and these will not affect the implementation of the present invention. Effectiveness and utility of patents. The scope of protection claimed in this application shall be based on the content of the claims, and the descriptions of the specific implementation manners in the description can be used to interpret the content of the claims.

Claims (10)

1. A weighing and force-measuring sensor for offset load error compensation is characterized by comprising a shell and a sensing circuit, wherein the shell has elasticity, and the sensing circuit comprises: a first circuit, a second circuit, a third circuit, a fourth circuit, and a reference circuit; the first circuit, the second circuit, the third circuit, the fourth circuit and the reference circuit are all provided with measuring pieces;

one end of the first circuit is connected with a first signal, one end of the second circuit is connected with a second signal, one end of the third circuit is connected with a third signal, one end of the fourth circuit is connected with a fourth signal, and one end of the reference circuit is connected with a reference signal; the other end of the first circuit, the other end of the second circuit, the other end of the third circuit and the other end of the fourth circuit are connected with the other end of the reference circuit and then grounded;

the first circuit and the third circuit sense the same strain area of the shell of the weighing and force-measuring sensor, the second strain area and the fourth strain area sense the same strain area of the shell of the weighing and force-measuring sensor, the first circuit and the second circuit sense different strain areas of the shell of the weighing and force-measuring sensor, and the reference circuit senses a non-strain area of the shell; the reference signal and the first signal, the second signal, the third signal and the fourth signal respectively form differential signals.

2. The off-load error compensation weighing load cell of claim 1, wherein: the grounding end of the first circuit, the grounding end of the second circuit, the grounding end of the third circuit and the grounding end of the fourth circuit are connected with the same grounding port, and the grounding port is grounded after being connected with the reference circuit.

3. The off-load error compensation weighing load cell of claim 1, wherein: the grounding end of the first circuit and the grounding end of the fourth circuit are connected with the same first grounding port, the grounding end of the second circuit and the grounding end of the third circuit are connected with the same second grounding port, the first grounding port and the second grounding port are respectively connected with the reference grounding port of the reference circuit through wires, the reference grounding port is grounded, and the first grounding port and the second grounding port are different ports.

4. The off-load error compensation weighing load cell of claim 1, wherein: the first circuit and the third circuit sense the pressure of the compressive strain area of the shell of the weighing and load measuring sensor, and the second circuit and the fourth circuit sense the tension of the tensile strain area of the shell of the weighing and load measuring sensor.

5. The off-load error compensation weighing load cell of claim 1, wherein: the first signal, the second signal, the third signal, the fourth signal and the reference signal are all constant current excitation.

6. The off-load error compensation weighing load cell of claim 1, wherein: the measuring member in the first, second, third and fourth circuits comprises at least one strain gauge and the measuring member in the reference circuit comprises at least one strain gauge or resistor.

7. The off-load error compensation weighing load cell of claim 1, wherein: the shell further comprises an elastic base station, a measuring cavity is arranged on one side of the base station, and a PCB is arranged on the other side of the base station; one side of the top of the base station close to the measuring cavity is provided with a bearing part, and one side of the top of the base station close to the PCB is provided with a fixing part; the measuring piece is a strain gauge which is distributed in the measuring cavity.

8. The off-load error compensation weighing load cell of claim 7, wherein: the strain gauges in the first circuit, the second circuit, the third circuit and the fourth circuit are circumferentially and uniformly distributed in the measuring cavity, and the strain gauges in the reference circuit are arranged in a non-strain area of the measuring cavity.

9. The off-load error compensation weighing load cell of claim 1, wherein: the PCB comprises a data processing unit, a data acquisition unit, a storage unit and an output unit;

the data acquisition unit acquires a first differential voltage signal between a first signal and a reference signal, acquires a second differential voltage signal between a second signal and the reference signal, acquires a third differential voltage signal between a third signal and the reference signal, acquires a fourth differential voltage signal between a fourth signal and the reference signal, and sends the first differential voltage signal, the second differential voltage signal, the third differential voltage signal and the fourth differential voltage signal to the data processing unit;

the storage unit is used for storing a first angular difference coefficient of the first circuit, a second angular difference coefficient of the second circuit, a third angular difference coefficient of the third circuit and a fourth angular difference coefficient of the fourth circuit;

the data processing unit is used for calculating to obtain weighing result information according to the first angular difference coefficient, the second angular difference coefficient, the third angular difference coefficient and the fourth angular difference coefficient in the storage unit by combining the first differential voltage signal, the second differential voltage signal, the third differential voltage signal and the fourth differential voltage signal sent by the data acquisition unit;

and the output unit is used for outputting the weighing result information sent by the data processing unit.

10. The off-load error compensation weighing load cell of claim 9, wherein: the PCB also comprises an input module and a preprocessing module;

the input module is used for inputting the current loading weight information and the current loading position information;

the preprocessing module is configured to calculate a first angular difference coefficient of the first circuit, a second angular difference coefficient of the second circuit, a third angular difference coefficient of the third circuit, and a fourth angular difference coefficient of the fourth circuit according to the first differential voltage signal, the second differential voltage signal, the third differential voltage signal, and the fourth differential voltage signal sent by the data acquisition unit and by combining current loading weight information and current loading position information input by the input module, and send the first angular difference coefficient, the second angular difference coefficient, the third angular difference coefficient, and the fourth angular difference coefficient to the storage module for storage.

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