CN114935390A - Weighing force-measuring sensor for unbalance loading error compensation - Google Patents
Weighing force-measuring sensor for unbalance loading error compensation Download PDFInfo
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- CN114935390A CN114935390A CN202210543155.4A CN202210543155A CN114935390A CN 114935390 A CN114935390 A CN 114935390A CN 202210543155 A CN202210543155 A CN 202210543155A CN 114935390 A CN114935390 A CN 114935390A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
- G01G3/14—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of electrical resistance
- G01G3/1414—Arrangements for correcting or for compensating for unwanted effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
- G01G3/14—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of electrical resistance
- G01G3/142—Circuits specially adapted therefor
- G01G3/145—Circuits specially adapted therefor involving comparison with a reference value
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2268—Arrangements for correcting or for compensating unwanted effects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Measurement Of Force In General (AREA)
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
Technical Field
The invention belongs to the field of sensor control, and particularly relates to a weighing and force-measuring sensor for unbalance loading error compensation.
Background
The resistance strain type sensor is a resistance type sensor which takes a resistance strain gauge and an elastic element as conversion elements and converts the magnitude of a force value into a voltage signal through a wheatstone bridge as shown in fig. 1. The sensor has the advantages of high precision, wide measuring range, long service life, simple structure and the like, and is widely applied to the field of weighing and force measuring sensors.
In practical use, the weighing and force-measuring sensor is arranged below the weighing platform, and when objects are loaded at different positions on the weighing platform, the stress on the weighing and force-measuring sensor is different, so that an unbalance loading error is generated. In order to correct the unbalance loading error of the weighing equipment, people adjust the correction coefficient of the sensor to realize the unbalance loading correction of the weighing equipment. For multi-sensor weighing devices, offset load error correction is achieved by adjusting correction coefficients associated with each exit. For single-sensor weighing equipment, the offset load error correction is generally realized by filing the wall thickness of the strain beam of the elastic element of the weighing load cell by a file. When the filing is repaired, the production experience of operators is completely relied on, the filing technical requirement on staff is higher, time and labor are wasted, and the method is only limited to a weighing and force measuring sensor with a parallel beam structure and has a plurality of limitations in the aspect of meeting the actual application requirements.
With the improvement of the production cost, the requirement of sensor intellectualization is increased, how to improve the production efficiency, shorten the production period and simplify the correction of the unbalance loading error of the weighing and force measuring sensor is a major challenge for manufacturers of the current weighing and force measuring sensors.
Disclosure of Invention
The invention provides a weighing force transducer for unbalance loading error compensation, which is used for solving the problem of unbalance loading error caused by the fact that a Wheatstone bridge is directly adopted by a single weighing force transducer in the prior art.
The basic scheme of the invention is as follows: a weighing load cell for offset load error compensation comprising a housing and a sensing circuit, said housing having elasticity, said sensing circuit comprising: 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 parts;
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.
Furthermore, 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.
Furthermore, 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.
Further, the first circuit and the third circuit sense pressure in a compressive strain zone of the housing of the weighing load cell, and the second circuit and the fourth circuit sense tension in a tensile strain zone of the housing of the weighing 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 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.
Furthermore, the shell also comprises an elastic base station, one side of the base station is provided with a measuring cavity, and the other side of the base station is provided with a PCB (printed Circuit Board); 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, 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 circumferentially and uniformly distributed in the measuring cavity in a symmetrical manner, and the strain gauge in the reference circuit is installed in a non-strain area of the measuring cavity.
Further, 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, a second differential voltage signal between a second signal and the reference signal, a third differential voltage signal between a third signal and the reference signal, 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.
Further, 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.
According to the scheme, the reference circuit is used for measuring differential signals between each circuit and the reference circuit, and the deviation of the weighing and force measuring sensor at each position is known through the differential signals, so that the final output value of the weighing and force measuring sensor can be adjusted conveniently. On the basis of the existing weighing force-measuring sensor, the influence of a plurality of different angles on an output value is eliminated by setting a plurality of differential signals, and then specific unbalance loading error compensation is realized through a PCB (printed Circuit Board), and specifically, a plurality of predicted cross coefficients and measured values are calculated for error compensation, so that the output value after unbalance loading error compensation is finally obtained.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art 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 merely illustrates the basic structure of the present invention in a schematic manner, and therefore it shows only the constitution related to the present invention.
FIG. 1 is a circuit configuration diagram of a load cell of the prior art;
FIG. 2 is a schematic circuit diagram of an embodiment of a load cell for offset load error compensation in accordance with the present invention;
FIG. 3 is a schematic circuit diagram of an embodiment of a load cell for offset load error compensation in accordance with the present invention;
FIG. 4 is a block diagram of a load cell of an embodiment of a load cell for offset load error compensation according to the present invention;
FIG. 5 is a block diagram of a PCB board of a load cell in accordance with an embodiment of the load cell for offset load error compensation of the present invention.
Detailed Description
To make the objects, 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, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a weighing and force-measuring sensor for offset load error compensation, which comprises 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.
The upper end of the first circuit is connected with a first signal SIG _1, the upper end of the second circuit is connected with a second signal SIG _2, the lower end of the third circuit is connected with a third signal SIG _3, the lower end of the fourth circuit is connected with a fourth signal SIG _4, and the upper end of the reference circuit is connected with a 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 connected with the lower end of the reference circuit, and the rear ends of the first circuit, the second circuit, the third circuit and the fourth circuit are grounded GND.
The first circuit and the third circuit sense the same strain area of the shell of the weighing and load cell sensor, the second strain area and the fourth strain area sense the same strain area of the shell of the weighing and load cell sensor, the first circuit and the second circuit sense different strain areas of the shell of the weighing and load cell sensor, and the measuring part of the reference circuit senses a non-strain area of the shell; the reference signal SIG _0 and the first signal SIG _1, the second signal SIG _2, the third signal SIG _3, and the fourth signal SIG _4 respectively constitute differential signals. The measuring part of the reference circuit senses the tension and the pressure of a non-strain area of the shell, wherein the non-strain area is a zero-strain area, and the tension and the pressure of the area have almost no strain change 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 to the reference circuit and then grounded to 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 a same first ground port, the ground terminal of the second circuit and the ground terminal of the third circuit are connected to a same second ground port, the first ground port and the second ground port are respectively connected to the reference ground port of the reference circuit through wires, the reference ground port is grounded, and the first ground port and the second ground port are different ports.
In some examples, the first and third circuits sense a compressive force of a compressive strain zone of the housing of the load cell, and the second and fourth circuits sense a tensile force of a tensile strain zone of the housing of the load cell.
In some examples, as shown in fig. 2 and 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 excitations, and the applied constant excitation current ranges from 0.2mA to 17 mA.
In some examples, the measuring members include strain gauges and/or resistors, each measuring member includes at least one strain gauge or resistor, and at least one measuring member includes a strain gauge. That is, in the load bearing force sensor, it is not allowed that all of the measuring members are resistors, or all of the measuring members are constituted by a plurality of resistors.
Specifically, the measuring pieces are 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, respectively. The first measuring member G1, the second measuring member G2, the third measuring member G3 and the fourth measuring member G4 each include one or more strain gauges, and the reference measuring member G0 may be constituted by one resistor, a plurality of resistors, one strain gauge, a plurality of strain gauges, or a combination of a strain gauge 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 provided as a circuit structure of a strain gauge and a resistor.
In some examples, as shown in fig. 4, the housing further includes a base 1 having elasticity, 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; a bearing part 4 is arranged on one side of the top of the base platform 1 close to the measuring cavity 2, and a fixing part 5 is arranged on one side of the top of the base platform 1 close to the PCB 3; the measuring parts are all strain gauges, and all the strain gauges are distributed in the measuring cavity.
Furthermore, in a first circuit connected with the first signal SIG _1, a second circuit connected with the second signal SIG _2, a third circuit connected with the third signal SIG _3 and a fourth circuit connected with the fourth signal SIG _4, the strain gauges are uniformly and symmetrically distributed in the circumferential direction in the measuring cavity 2, measuring parts where the strain gauges of the first circuit and the third circuit are located sense the pressure of a compressive strain area of the shell, and measuring parts where the strain gauges of the second circuit and the fourth circuit are located sense the tension of a tensile strain area of the shell; in the reference circuit connected to the reference signal SIG _0, the measuring element in which the strain gauge is located is mounted in the non-strained region of the measuring chamber 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 acquisition unit 31 acquires a first differential voltage signal V1 between the first signal SIG _1 and the reference signal SIG _0, acquires a second differential voltage signal V2 between the second signal SIG _2 and the reference signal SIG _0, acquires a third differential voltage signal V3 between the third signal SIG _3 and the reference signal SIG _0, acquires a fourth differential voltage signal V4 between the fourth signal SIG _4 and the reference signal SIG _0, and transmits 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 to the data processing unit 33;
the storage unit 32 is configured to store a first angular difference coefficient a of the first circuit, a second angular difference coefficient b of the second circuit, a third angular difference coefficient c of the third circuit, and a fourth angular difference coefficient d of the fourth circuit;
the data processing unit 33 is configured to calculate to obtain weighing result information 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, in combination with 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 sent by the data acquisition unit 31;
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 configured to input current loading weight information and current loading position information; the preprocessing module 36 is configured to calculate, according to 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 sent by the data acquisition unit 31, and by combining the current loading weight information and the current loading position information input by the input module 35, a first angular difference coefficient a of the first circuit, a second angular difference coefficient b of the second circuit, a third angular difference coefficient c of the third circuit, and a fourth angular difference coefficient d of the fourth circuit, and send the calculated coefficients to the storage module 32 for storage.
Specifically, in implementation, the angular difference coefficient of each circuit is calculated by the preprocessing module 36. Taking four measurement circuits as an example, the method comprises the following steps:
at S1, the external force applied to the load bearing part 4 of the housing is 0(F is 0), and zero point outputs of the differential voltage signals are obtained, the zero point output V1_0 of the first differential voltage signal V1, the zero point output V2_0 of the second differential voltage signal V2, the zero point output V3_0 of the third differential voltage signal V3, and the zero point output V4_0 of the fourth differential voltage signal V4, respectively.
S2, a weight with a known weight is loaded in the center of the test table top, a first group of outputs of each differential voltage signal is subtracted from a zero output to obtain V1_ 1-V4 _1, specifically, a difference V1_1 between a first differential voltage signal V1 and the zero output V1_0, a difference V2_1 between a second differential voltage signal V2 and the zero output V2_0, a difference V3_1 between a third differential voltage signal V3 and the zero output V3_0, and a difference V4_1 between a fourth differential voltage signal V4 and the zero output V4_0 are tested.
S3, a weight with a known weight is loaded on a first corner of the test table to obtain a subtraction of each second group of outputs of the differential voltage signals and the zero output to obtain V1_ 2-V4 _2, specifically, a difference V1_2 between a first differential voltage signal V1 obtained through testing and the zero output V1_0, a difference V2_2 between a second differential voltage signal V2 obtained through testing and the zero output V2_0, a difference V3_2 between a third differential voltage signal V3 obtained through testing and the zero output V3_0, and a difference V4_2 between a fourth differential voltage signal V4 obtained through testing and the zero output V4_ 0.
S4, a weight with a known weight is loaded on a second corner of the test table to obtain a subtraction of each second group of differential voltage signal outputs and a zero output to obtain V1_ 3-V4 _3, specifically, a difference V1_3 between a first differential voltage signal V1 obtained through testing and a zero output V1_0, a difference V2_3 between a second differential voltage signal V2 obtained through testing and a zero output V2_0, a difference V3_3 between a third differential voltage signal V3 obtained through testing and a zero output V3_0, and a difference V4_3 between a fourth differential voltage signal V4 obtained through testing and a zero output V4_ 0.
S5, a weight with a known weight is loaded on a third corner of the test table to obtain a subtraction of the second group of outputs of the differential voltage signals and the zero output to obtain V1_ 4-V4 _4, specifically, a difference V1_4 between the first differential voltage signal V1 and the zero output V1_0, a difference V2_4 between the second differential voltage signal V2 and the zero output V2_0, a difference V3_4 between the third differential voltage signal V3 and the zero output V3_0, and a difference V4_4 between the fourth differential voltage signal V4 and the zero output V4_0 are tested.
S6, the following equations are solved to obtain the angular difference coefficients a, b, c, d,
and S7, sending 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 d of the fourth circuit obtained in the S6 to the storage module 32 for storage.
Moreover, the data processing unit 33 calculates weighing result information, i.e. a sensor output value V0, 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, in combination with 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 sent by the data acquisition unit 31; specifically, V0 ═ aV1 '+ bV 2' + cV3 '+ dV 4'. Wherein V1 'to V4' are AD-converted values of V1 to V4.
The present case utilizes star type circuit, when carrying out the during operation, with first circuit in the star type circuit, the second circuit, the common terminal of third circuit and fourth circuit is ground connection directly or indirectly, the circuit preferentially adopts constant current excitation to replace original constant voltage excitation, it is under different electric field intensity to have solved the foil gage in traditional design, the measurement resistance of foil gage under the high voltage is bigger than in actual resistance deviation, the unstable problem of the weighing survey sensor that leads to, the drift problem of foil gage measurement bridge has been reduced, the EMC noise immunity of input has been improved, thereby the precision and the stability of sensor have been guaranteed. Meanwhile, offset load error compensation is realized under the condition that the number of the electric bridges is not increased, and the cost is increased slightly; in the production and manufacturing links, manual links such as mechanical grinding and the like are omitted, the labor is saved, the measuring and recording procedures of the relation between the gravity center and the angular difference do not need to be added, and the production efficiency is improved.
The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics is not described herein in any greater extent than that known in the art at the filing date or prior to the priority date of the application, so that those skilled in the art can now appreciate that all of the above-described techniques in this field and have the ability to apply routine experimentation before this date can be combined with one or more of the present teachings to complete and implement the present invention, and that certain typical known structures or known methods do not pose any impediments to the implementation of the present invention by those skilled in the art. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several variations and modifications can be made, which should also be considered as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the utility of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents 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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Citations (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5967423A (en) * | 1982-10-12 | 1984-04-17 | Matsushita Electric Works Ltd | Load converter |
| US4526246A (en) * | 1984-02-23 | 1985-07-02 | Reliance Electric Company | Water-resistant weighing apparatus |
| US4898255A (en) * | 1989-01-17 | 1990-02-06 | Toledo Scale Corporation | Planar load cell |
| US20090114455A1 (en) * | 2006-07-11 | 2009-05-07 | Sartorius Ag | Top-pan scales with corner load sensor |
| CN102506982A (en) * | 2011-10-19 | 2012-06-20 | 深圳市杰曼科技有限公司 | Automatic compensating signal acquiring system |
| CN202562673U (en) * | 2012-04-20 | 2012-11-28 | 湖南省交通科学研究院 | Strain acquisition system based on voltage compensation |
| CN103196526A (en) * | 2013-03-13 | 2013-07-10 | 浙江省计量科学研究院 | Dynamometry weighing sensor with unbalance loading isolating function and isolating measuring method thereof |
| US20140008133A1 (en) * | 2012-07-04 | 2014-01-09 | Measurement Ltd | Load cell assembly for an electrical scale |
| CN104374453A (en) * | 2014-12-03 | 2015-02-25 | 烟台钧杰衡器有限公司 | Multichannel digitized intelligent unbalance loading error correcting and weighing sensor and weighing method thereof |
| CN204241078U (en) * | 2014-12-03 | 2015-04-01 | 烟台钧杰衡器有限公司 | Multichannel digital uneven loading error intelligence revises single beam type LOAD CELLS |
| CN105241597A (en) * | 2015-09-29 | 2016-01-13 | 北京航天发射技术研究所 | Large-tonnage high-precision platform force measuring system and force measuring method |
| CN207662559U (en) * | 2017-09-08 | 2018-07-27 | 天津汇康医用设备有限公司 | A kind of pressure measurement circuitry of auto thermal compensation |
| CN110057477A (en) * | 2019-05-09 | 2019-07-26 | 合肥工业大学 | A kind of Signal Measurement System that the multichannel AC/DC for strain force sensor motivates |
| CN110823446A (en) * | 2019-10-18 | 2020-02-21 | 成都凯天电子股份有限公司 | Secondary temperature compensation zero debugging method for silicon piezoresistive pressure sensor |
| CN210123318U (en) * | 2019-07-31 | 2020-03-03 | 浙江荷清柔性电子技术有限公司 | Strain measurement circuit based on strain gauge |
| CN111829620A (en) * | 2014-10-09 | 2020-10-27 | 梅特勒-托利多(常州)精密仪器有限公司 | Weighing sensor, weighing network and monitoring method |
| CN111855078A (en) * | 2020-07-28 | 2020-10-30 | 中国电子科技集团公司第四十八研究所 | Automatic zero point adjusting circuit and method for bridge force measuring sensor |
| CN112985571A (en) * | 2021-03-25 | 2021-06-18 | 梅特勒-托利多(常州)精密仪器有限公司 | Digital weighing sensor and weighing system thereof |
| CN114354033A (en) * | 2021-12-27 | 2022-04-15 | 中国航天空气动力技术研究院 | Force sensor and manufacturing method thereof |
| CN114441070A (en) * | 2020-11-05 | 2022-05-06 | 梅特勒-托利多(常州)精密仪器有限公司 | Roeberg structure sensor with unbalance loading resisting function and weighing equipment |
| CN114485877A (en) * | 2022-01-25 | 2022-05-13 | 常州纺织服装职业技术学院 | Weighing system and method for weighing compensation by combining inertia measurement module |
-
2022
- 2022-05-17 CN CN202210543155.4A patent/CN114935390B/en active Active
Patent Citations (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5967423A (en) * | 1982-10-12 | 1984-04-17 | Matsushita Electric Works Ltd | Load converter |
| US4526246A (en) * | 1984-02-23 | 1985-07-02 | Reliance Electric Company | Water-resistant weighing apparatus |
| US4898255A (en) * | 1989-01-17 | 1990-02-06 | Toledo Scale Corporation | Planar load cell |
| US20090114455A1 (en) * | 2006-07-11 | 2009-05-07 | Sartorius Ag | Top-pan scales with corner load sensor |
| CN102506982A (en) * | 2011-10-19 | 2012-06-20 | 深圳市杰曼科技有限公司 | Automatic compensating signal acquiring system |
| CN202562673U (en) * | 2012-04-20 | 2012-11-28 | 湖南省交通科学研究院 | Strain acquisition system based on voltage compensation |
| US20140008133A1 (en) * | 2012-07-04 | 2014-01-09 | Measurement Ltd | Load cell assembly for an electrical scale |
| CN103196526A (en) * | 2013-03-13 | 2013-07-10 | 浙江省计量科学研究院 | Dynamometry weighing sensor with unbalance loading isolating function and isolating measuring method thereof |
| CN111829620A (en) * | 2014-10-09 | 2020-10-27 | 梅特勒-托利多(常州)精密仪器有限公司 | Weighing sensor, weighing network and monitoring method |
| CN204241078U (en) * | 2014-12-03 | 2015-04-01 | 烟台钧杰衡器有限公司 | Multichannel digital uneven loading error intelligence revises single beam type LOAD CELLS |
| CN104374453A (en) * | 2014-12-03 | 2015-02-25 | 烟台钧杰衡器有限公司 | Multichannel digitized intelligent unbalance loading error correcting and weighing sensor and weighing method thereof |
| CN105241597A (en) * | 2015-09-29 | 2016-01-13 | 北京航天发射技术研究所 | Large-tonnage high-precision platform force measuring system and force measuring method |
| CN207662559U (en) * | 2017-09-08 | 2018-07-27 | 天津汇康医用设备有限公司 | A kind of pressure measurement circuitry of auto thermal compensation |
| CN110057477A (en) * | 2019-05-09 | 2019-07-26 | 合肥工业大学 | A kind of Signal Measurement System that the multichannel AC/DC for strain force sensor motivates |
| CN210123318U (en) * | 2019-07-31 | 2020-03-03 | 浙江荷清柔性电子技术有限公司 | Strain measurement circuit based on strain gauge |
| CN110823446A (en) * | 2019-10-18 | 2020-02-21 | 成都凯天电子股份有限公司 | Secondary temperature compensation zero debugging method for silicon piezoresistive pressure sensor |
| CN111855078A (en) * | 2020-07-28 | 2020-10-30 | 中国电子科技集团公司第四十八研究所 | Automatic zero point adjusting circuit and method for bridge force measuring sensor |
| CN114441070A (en) * | 2020-11-05 | 2022-05-06 | 梅特勒-托利多(常州)精密仪器有限公司 | Roeberg structure sensor with unbalance loading resisting function and weighing equipment |
| CN112985571A (en) * | 2021-03-25 | 2021-06-18 | 梅特勒-托利多(常州)精密仪器有限公司 | Digital weighing sensor and weighing system thereof |
| CN114354033A (en) * | 2021-12-27 | 2022-04-15 | 中国航天空气动力技术研究院 | Force sensor and manufacturing method thereof |
| CN114485877A (en) * | 2022-01-25 | 2022-05-13 | 常州纺织服装职业技术学院 | Weighing system and method for weighing compensation by combining inertia measurement module |
Non-Patent Citations (1)
| Title |
|---|
| "《一种抗偏电阻应变式力传感器的设计与研究》" * |
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