CN117516672A - Micro-electromagnetic force weighing sensor and dynamic temperature compensation method thereof - Google Patents
Micro-electromagnetic force weighing sensor and dynamic temperature compensation method thereof Download PDFInfo
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- 238000005303 weighing Methods 0.000 title claims abstract description 184
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- 238000005259 measurement Methods 0.000 claims abstract description 46
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- 238000001816 cooling Methods 0.000 claims description 11
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G7/00—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups
- G01G7/02—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups by electromagnetic action
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/01—Testing or calibrating of weighing apparatus
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Abstract
The invention relates to the technical field of micro electromagnetic force weighing, in particular to a micro electromagnetic force weighing sensor and a dynamic temperature compensation method thereof, wherein the sensor body is designed into an integrated structure, so that the number of parts is reduced on one hand, and the difficulty of assembly and installation processes and the assembly error between the parts are reduced; on the other hand, the material of the whole structure is uniform, the effect of thermal expansion and contraction of the whole structure due to external temperature change is uniform, and the stability and reliability of the whole structure are improved, so that the measurement accuracy is improved, and the measurement accuracy and reliability are also ensured; meanwhile, the temperature compensation display module is used for displaying the measurement result after compensating according to the real-time temperature of the external environment, so that the influence of the external environment on the weighing result is avoided, the accuracy of the weighing result is further improved, the application range is wider, and the use is more stable and reliable.
Description
Technical Field
The invention relates to the technical field of micro electromagnetic force weighing, in particular to a micro electromagnetic force weighing sensor and a dynamic temperature compensation method thereof.
Background
Micro-electromagnetic weighing sensors are sensors that utilize the magnetic effect of current for weighing, which are widely used for high precision measurement in various industries, such as: detection in the fields of environment, energy, clinical examination and the like; measurement in the fields of agriculture, food and medicine, metal manufacturing, and the like; the method has the characteristics of wide measurement range, high measurement speed, high measurement precision and the like, and plays an important role in the field of high-precision measurement.
For example, patent publication CN103175595B, entitled weighing cell with photoelectric position sensor based on electromagnetic force compensation principle discloses a weighing cell based on electromagnetic force compensation principle, comprising a stationary base part, and a permanent magnet system mounted on the base part. The suspension coil is connected to the load receiver by a force transfer mechanism and directs a compensation current. Also included is an optoelectronic position sensor whose sensor signal corresponds to the deflection of the coil from the null position. The closed-loop controller controls the compensation current in such a way that under the effect of electromagnetic forces acting between the coil and the permanent magnet system, the coil and the load receiver connected to the coil are returned to their zero positions, enabling accurate weighing of the object.
Based on the weighing principle provided by the above patent, the weighing unit of the existing electromagnetic force compensation principle is disclosed in the patent with publication number of CN216283845U, named electromagnetic force balance weighing sensor, and the electromagnetic force balance weighing sensor is disclosed, although the measuring range is increased, the whole structure comprises a plurality of parts due to the split structure, so that the difficulty of the assembly process is increased, and meanwhile, the thermal expansion and contraction effects generated by different parts in different environment temperatures are inconsistent, so that the measuring precision is reduced, and the practical use requirement of precise measurement cannot be met.
In the research of the temperature compensation method, the domestic micro electromagnetic force weighing sensor mainly performs hardware compensation of a circuit through the temperature characteristic of a triode PN node, and the defect of the compensation mode is obvious. Firstly, the quantitative relation between the compensation mode of the hardware and the drift generated by temperature change is not clear, and the compensation mode and the temperature drift have obvious asymmetry, when the temperature drift is generated, the traditional hardware temperature compensation method cannot effectively influence the real-time temperature change due to the time response of the heat transfer efficiency, and cannot realize the real-time compensation of the measurement error caused by the temperature.
Disclosure of Invention
The invention aims to provide a micro electromagnetic force weighing sensor and a dynamic temperature compensation method thereof, which solve the problem of low measurement precision of the existing split type micro electromagnetic force weighing sensor.
The technical scheme for achieving the purposes is as follows:
the micro electromagnetic force weighing sensor is characterized by comprising a sensor body, an electromagnetic force balancing unit and a temperature compensation display module, wherein the sensor body comprises a base, a cantilever weighing unit and a lever unit, the cantilever weighing unit is arranged at one end of the base, the electromagnetic force balancing unit is arranged at the other end of the base, the lever unit is arranged between the electromagnetic force balancing unit and the cantilever weighing unit, the connecting end of the lever unit is connected with the cantilever weighing unit, the adjusting end of the lever unit extends to the inner side of the electromagnetic force balancing unit, and the electromagnetic force balancing unit is in communication connection with the temperature compensation display module.
Further defined, the temperature compensation display module comprises an indication display unit, a temperature compensation unit and a temperature sensor, wherein the temperature sensor is in communication connection with the indication display unit through the temperature compensation unit, and the temperature sensor is arranged on the base.
Further defined, the cantilever weighing unit comprises a vertical beam, a first coupling beam, a load supporting column head, four first parallel lever beams and a plurality of elastic reeds, wherein the vertical beam is vertically arranged at one end of the base, the first coupling beam is vertically arranged above the base, the first coupling beam is parallel to the vertical beam, the four first parallel lever beam arrays are arranged between the first coupling beam and the vertical beam, the first parallel lever beams are parallel to the base, the load supporting column head is arranged at the top of the first coupling beam, the load supporting column head is positioned between the vertical beam and the first coupling beam, the load supporting column head is positioned between the first parallel lever beams, and the bottom of the load supporting column head is connected with the connecting end of the lever unit; the elastic reeds are respectively positioned between the corresponding vertical beam and the first parallel lever beam and between the first coupling beam and the first parallel lever beam.
The cantilever weighing unit further comprises a unbalanced load force arm, an unbalanced load compensation moment beam and an unbalanced load error adjusting knob, wherein the unbalanced load force arm is positioned at the bottom of the vertical beam and is parallel to the vertical beam, an adjusting gap is arranged between the unbalanced load force arm and the vertical beam, the unbalanced load error adjusting knob is in threaded connection with the bottom of the unbalanced load force arm, and the unbalanced load error adjusting knob penetrates through the adjusting gap and is in contact with the vertical beam; the unbalanced load compensation moment beam is arranged in parallel with the unbalanced load moment arm, the bottom of the unbalanced load compensation moment beam is connected to the top of the unbalanced load moment arm, and the top of the unbalanced load compensation moment beam is connected to the top of the vertical beam;
The lever unit comprises a second coupling beam, a supporting beam and a second parallel lever beam; the second coupling beam is vertically arranged, the bottom end of the second coupling beam is connected with the bottom end of the first coupling beam, the top end of the second coupling beam is connected with the connecting end of the second parallel lever beam, the adjusting end of the second parallel lever beam extends into the electromagnetic force balancing unit, the coil is connected with the bottom surface of the other end of the second parallel lever beam, the photoelectric position sensor is oppositely arranged with the other end of the second parallel lever beam, the supporting beam is vertically arranged, the supporting beam is connected between the second parallel lever beam and the base, and the supporting beam is positioned between the connecting end of the second parallel lever beam and the adjusting end of the second parallel lever beam.
Further defined, the electromagnetic force balancing unit comprises a sensor seat, a magnetic steel body, a coil and a photoelectric position sensor, wherein the sensor seat comprises a sensor base and a magnetic steel end cover connected with the top of the sensor base, two oppositely arranged photoelectric position sensor mounting plates are arranged at the top of the inner side of the magnetic steel end cover, the photoelectric position sensor mounting plates are arranged with a second parallel lever Liang Tongxiang, a photoelectric sensor gap is arranged on the second parallel lever beam, the photoelectric sensor gap is positioned between the two photoelectric position sensor mounting plates, the photoelectric position sensor is arranged on any photoelectric position sensor mounting plate, and the photoelectric position sensor is arranged opposite to the photoelectric sensor gap; the sensor base is located the other end of base, the magnet steel body sets up in the sensor base, and the magnet steel body is connected with the base, the coil sets up in the magnet steel body along the axis of the magnet steel body, the coil is connected with the bottom surface of lever unit regulation end.
The dynamic temperature compensation method of the micro electromagnetic force weighing sensor is characterized by comprising the following steps of:
s1, performing a temperature rise test and a temperature reduction test on a micro electromagnetic force weighing sensor to obtain indication value differences, temperature differences and zero-position voltage differences of the micro electromagnetic force weighing sensor under the same load and at different temperatures;
s2, fitting the indication value difference, the temperature difference and the zero-position voltage difference obtained in the heating test and the cooling test according to the step S1 to obtain an indication value curve compensation value;
s3, determining a measuring range of the temperature sensor and an index value of the temperature sensor, gradually heating up in the measuring range of the temperature sensor according to the index value of the temperature sensor, and performing a load test to obtain indication value linear compensation values corresponding to different temperatures;
and S4, compensating the measured value obtained when the micro electromagnetic force weighing sensor is weighed according to the indication curve compensation value and the indication linear compensation value to obtain a final weighing result and displaying the final weighing result.
Further defined, said step S1 comprises the steps of:
s11, placing the micro electromagnetic force weighing sensor in a high-low temperature box, wherein the temperature of the high-low temperature box is set to be T min ，T min For the lowest temperature of the high-low temperature box, placing a high-low temperature test standard weight on the micro electromagnetic force weighing sensor, and completing the temperature rise test calibration of the micro electromagnetic force weighing sensor to obtain zero voltage Vh under the current coil balance state 0 Measurement Th of temperature sensor 0 And an indication value Mh of an indication value display unit 0 ；
S12, increasing the temperature of the high-low temperature box to T i Then placing a high-low temperature test standard weight on the micro electromagnetic force weighing sensor to obtain zero voltage Vh under the current coil balance state i Measurement Th of temperature sensor i And an indication value Mh of an indication value display unit i ，T i ＝T min +iT rate ，T rate I is the i-th increase of the temperature of the high-low temperature box for the temperature variation;
according to DeltaM i ＝Mh i -Mh 0 、ΔT i ＝Th i -Th 0 And DeltaV i ＝Vh i -Vh 0 Calculating to obtain the indication value difference delta M of the micro electromagnetic force weighing sensor after the temperature of the high-low temperature box is increased for the ith time i Temperature difference DeltaT i And zero voltage difference DeltaV i ：
S13, judging T i Whether or not it is smaller than the highest temperature T of the high-low temperature box max If yes, go on to step S12, if no, go to step S14;
s14, placing the micro electromagnetic force weighing sensor in a high-low temperature box, wherein the temperature of the high-low temperature box is set to be T max Placing a high-low temperature test standard weight on the micro electromagnetic force weighing sensor, completing the cooling test calibration of the micro electromagnetic force weighing sensor, and obtaining the zero voltage Vc in the current coil balance state 0 Temperature sensor measurement Tc 0 And indication value Mc of indication value display unit 0 ；
S15, reducing the temperature of the high-low temperature box to T n Then, a standard weight is loaded on the micro electromagnetic force weighing sensor to obtain zero voltage in the current coil balance state Vc n Temperature sensor measurement Tc n And indication value Mc of indication value display unit n ，T n ＝T max -nT rate N is the nth time of reducing the temperature of the high-low temperature box;
according to DeltaM n ＝Mc n -Mc 0 、ΔT n ＝Tc n -Tc 0 And DeltaV n ＝Vc n -Vc 0 The method comprises the steps of carrying out a first treatment on the surface of the Calculating to obtain the indication value difference delta M of the micro electromagnetic force weighing sensor after the temperature of the high-low temperature box is reduced for the nth time n Temperature difference DeltaT n And zero voltage difference DeltaV n ：
S16, judging T n Whether or not it is higher than the lowest temperature T of the high-low temperature box min If yes, go on to step S15, if no, go to step S2.
Further defined, the step S2 specifically includes:
ΔM obtained from temperature increase test i 、ΔT i And DeltaV i Δm obtained by cooling test n 、ΔT n And DeltaV n Fitting by using a multiple linear regression algorithm to obtain an indication curve compensation value delta M of the micro electromagnetic force weighing sensor:
ΔM＝b 0 +b 1 ΔT+b 2 ΔV+k
T 0 ＝T max -T min
wherein b 0 、b 1 And b 2 Are weight coefficients, k is a temperature subdivision constant, and DeltaT is the actual temperature and Th 0 The difference between the voltage and V is the actual zero voltage and V 0 The difference value between the two values, delta Mh is the difference value between the maximum indication value and the minimum indication value in the temperature rise test, and delta Mc is the difference value between the maximum indication value and the minimum indication value in the temperature reduction test.
Further defined, said step S3 comprises the steps of:
s31, placing the micro electromagnetic force weighing sensor in a high-low temperature box, wherein the temperature of the high-low temperature box is set to bet min ，t min The temperature calibration of the load test of the micro electromagnetic force weighing sensor is completed for the lowest measured value of the temperature sensor;
S32, increasing the temperature of the high-low temperature box to t x Standard weights with different weights are respectively weighed through micro electromagnetic force weighing sensors to obtain the current temperature difference delta t x Indicating value difference corresponding to different standard weights
Δt x ＝t x -t min
t x ＝t min +xt rate
Wherein x is the x-th increase of the temperature of the high-low temperature box, j is the j-th standard weight, G j Is the weight of the j-th standard weight,for the temperature of the high-low temperature box to be equal to t x When the indicator value of the j standard weight is weighed, t x T is the current temperature of the temperature box rate Is the index value of the temperature sensor;
s33, judging t x Whether or not it is smaller than the highest measured value t of the temperature sensor max If yes, go on to step S32, if no, go to step S34;
s34, indicating value difference obtained when carrying out load test according to different temperaturesCalculating to obtain an indication linear compensation value delta m corresponding to each temperature in the range of the temperature sensor x ：
Δm x ＝a x m x +b x
Wherein Δm is x For the temperature sensor to have a temperature equal to t x Time indication linear compensation value, a x For the temperature sensor to have a temperature equal to t x Scale factor of time, b x For the temperature sensor to have a temperature equal to t x Offset at time, m x For the temperature sensor to have a temperature equal to t x And measuring values of the micro electromagnetic force weighing sensor.
Further defined, said step S4 comprises the steps of:
S41, weighing the load to be measured through the micro electromagnetic force weighing sensor to obtain a measured value m of the micro electromagnetic force weighing sensor s Indication t of temperature sensor s Zero voltage V of the sum coil (300) s ；
S42, indicating the value t according to the real-time temperature sensor s The real-time linear compensation value delta m is obtained by matching the calculation formula of the indication value linear compensation value when the same temperature is adopted s ；
S43, according to Δm=b 0 +b 1 ΔT+b 2 ΔV+k，ΔT＝t s -Th 0 ，ΔV＝V s -Vh 0 Obtaining a real-time indication curve compensation value delta M;
s44, according to m=m s +Δm s The +Δm yields the final weighing result and is displayed by an indication display unit.
The invention has the beneficial effects that:
1. according to the invention, the sensor body is designed into an integrated structure, so that the number of parts is reduced, and the difficulty of assembly and installation processes and the assembly error between the parts are reduced; on the other hand, the material of the whole structure is uniform, the effect of thermal expansion and contraction of the whole structure due to external temperature change is uniform, and the stability and reliability of the whole structure are improved, so that the measurement accuracy is improved, and the measurement accuracy and reliability are also ensured; meanwhile, the temperature compensation display module is used for displaying the measurement result after compensating according to the real-time temperature of the external environment, so that the influence of the external environment on the weighing result is avoided, the accuracy of the weighing result is further improved, the application range is wider, and the use is more stable and reliable.
2. According to the invention, the sensor body is designed into an integrated structure, and the processing can be realized through numerical control integrated processing, so that the unbalanced load error caused by manual assembly is reduced, the symmetry of a force transmission model of the sensor can be improved, and accurate weighing data can be reproduced at different positions of a carrier.
3. According to the invention, the sensor body is designed into an integrated structure, and the sensor is provided with double limiting, namely the first parallel lever beam limiting and the second parallel lever beam limiting, so that limiting protection can be carried out on the input of the excessive load and the excessive current in two different fields.
4. According to the invention, the micro electromagnetic force weighing sensor is subjected to multiple tests before use to obtain the indication curve compensation value and the indication linear compensation value under different temperatures, so that on one hand, the compensation value under the current temperature can be obtained through calculation according to the indication curve compensation value, the weighing accuracy is improved, and on the other hand, the compensation value under the current temperature is obtained through matching according to the indication linear compensation value, so that the weighing error caused by the influence of the temperature on the integral structure of the micro electromagnetic force weighing sensor can be overcome, and the influence of the self error symmetrical weighing result of the temperature sensor can also be overcome.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic view of the cantilever weighing unit of the present invention in a bottom view;
FIG. 3 is a schematic diagram of a cantilever weighing cell of the present invention;
FIG. 4 is a schematic view of a sensor holder according to the present invention;
FIG. 5 is a schematic diagram of a front view of the present invention;
FIG. 6 is a schematic view of a sensor base structure according to the present invention;
FIG. 7 is a schematic diagram of a magnetic steel end cap structure according to the present invention;
in the figure: 100-a sensor body; 101-a base; 102-a sensor mount; 103-a sensor base; 104-a magnetic steel end cover; 105-first parallel lever beam limiting; 106-limiting a second parallel lever beam; 107-a magnetic steel end cover fixing hole; 108-installing a fixing hole; 200-magnetic steel body; 300-coil; 301-coil mounting holes; 400-photoelectric position sensor; 500-an indication display unit; 600-cantilever weighing units; 601-vertical beams; 602-a first coupling beam; 603-load-supporting studs; 604-a first parallel lever beam; 605-spring reed; 606-bias moment arm; 607-unbalanced load compensation moment beam; 608-unbalanced load error adjustment knob; 609-limit groove; 700-lever unit; 701-a second coupling beam; 702-supporting the beam; 703-a second parallel lever beam; 704-photosensor gaps; 705-an optoelectronic position sensor mounting plate; 800-a temperature compensation unit; 801—a temperature sensor; 802-temperature compensation control module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without the benefit of the present disclosure, are intended to be within the scope of the present application based on the described embodiments.
Example 1
Referring to fig. 1 and 2, the present embodiment provides a micro electromagnetic force weighing sensor, which includes a sensor body 100, an electromagnetic force balancing unit and a temperature compensation display module, wherein the temperature compensation display module includes an indication value display unit 500, a temperature compensation unit 800 and a temperature sensor 801, the indication value display unit 500 is in signal connection with the temperature sensor 801 through the temperature compensation unit 800, the sensor body 100 includes a base 101, a cantilever weighing unit 600 and a lever unit 700, the base 101, the cantilever weighing unit 600 and the lever unit 700 are in an integrated structure, and the electromagnetic force balancing unit includes a sensor seat 102, a magnetic steel body 200, a coil 300 and a photoelectric position sensor 400.
Specifically, the temperature compensation unit 800 includes a temperature compensation control module 802, an indication display unit 500, an optoelectronic position sensor 400, a coil 300 and a temperature sensor 801 are electrically connected to the temperature compensation control module 802, the temperature compensation control module 802 is configured to collect a voltage of the coil 300 and a signal of the optoelectronic position sensor 400, change a magnitude of a middle current of the coil 300 to make the optoelectronic position sensor 400 be at an equilibrium position, calculate a measured value of the micro electromagnetic force weighing sensor according to the magnitude of the current in the coil 300, obtain a zero voltage of the coil 300, obtain a temperature value of the temperature sensor 801, calculate a final weighing result according to the zero voltage of the coil 300, the measured value of the micro electromagnetic force weighing sensor and the temperature value of the temperature sensor 801, and send the final weighing result to the indication display unit 500 for display.
The coil 300 is installed in the magnet steel body 200, when the sensor body 100 places the load at one end through the lever principle, the other end of the sensor body 100 provided with the photoelectric position sensor 400 deflects, the photoelectric position sensor 400 deviates from the balance position, the coil 300 installed at the end of the sensor body 100 is driven to deflect at the same time, then the temperature compensation control module 802 changes the electromagnetic force between the coil 300 and the magnet steel body 200 by changing the current size in the coil 300, the coil 300 drives the photoelectric position sensor 400 to deflect to balance while changing the position height of the coil 300 in the magnet steel body 200, at the moment, the temperature compensation control module 802 calculates the weight of the current load according to the current size of the coil 300, and simultaneously, the real-time temperature acquired by the temperature sensor 801 is transmitted to the temperature compensation control module 802, the calculated weight of the current load is compensated according to the current temperature, finally, the calculated weight is displayed by the indication display unit 500, the measurement result is more accurate, the number of parts is reduced through the integral structure, the assembly error is reduced, the measurement accuracy is also reduced, the measurement accuracy is ensured, and the measurement accuracy is stable, and the requirements are met.
Specifically, referring to fig. 3, the sensor body 100 includes a base 101, a sensor seat 102, a cantilever weighing unit 600 and a lever unit 700, a temperature sensor 801 is mounted on the base 101, the cantilever weighing unit 600 and the sensor seat 102 are disposed at opposite ends of the base 101, and for illustration, the cantilever weighing unit 600 is located at a left end of the base 101 and the sensor seat 102 is located at a right end of the base 101, the cantilever weighing unit 600, the sensor seat 102 and the base 101 are in an integrated structure, the cantilever weighing unit 600 is located above the left end of the base 101, and the left end of the cantilever weighing unit 600 is connected with the left end of the base 101, so that the cantilever weighing unit 600 forms a cantilever structure, and mounting fixing holes 108 are formed at four corners of the base 101, so that the base 101 is convenient to be fixedly mounted to avoid shaking; in actual use, a load is placed on the cantilever weighing unit 600, thereby tilting the cantilever weighing unit 600 downward.
The lever unit 700 is located between the cantilever weighing unit 600 and the sensor seat 102, the left end of the lever unit 700 is connected with the right end of the cantilever weighing unit 600, at this time, the left end of the lever unit 700 is used as a connecting end, the right end of the lever unit 700 extends into the sensor seat 102 to deflect up and down according to the load, at this time, the right end of the lever unit 700 is used as an adjusting end, the lever unit 700 further comprises a supporting end connected with a supporting point, and the supporting end is located between the connecting end of the lever unit 700 and the adjusting end of the lever unit 700; in actual use, when the cantilever weighing unit 600 is inclined downward, the cantilever weighing unit 600 drives the connection end of the lever unit 700 to incline downward, and the lever unit 700 deflects upward under the action of the supporting end at the adjustment end of the lever unit 700.
The magnet steel body 200 is tubular structure, and the bottom of magnet steel body 200 is installed at base 101 up end, and magnet steel body 200 is located the inside of sensor seat 102, and the lower surface of the regulation end of lever unit 700 is connected with coil 300, and coil 300 sets up in magnet steel body 200 along the axis of magnet steel body 200, clearance fit between coil 300 and the magnet steel body 200 for can avoid coil 300 and magnet steel body 200 inner wall contact when lever unit 700 regulation end upwards deflects.
The photo-electric position sensor 400 is installed at the top of the inside of the sensor mount 102, and the photo-electric position sensor 400 is located above the adjustment end of the lever unit 700.
Further illustrated, the cantilever weighing unit 600 comprises a vertical beam 601, a first coupling beam 602, a load supporting column 603 and four first parallel lever beams 604; the vertical beam 601 is connected with the left end of the base 101, the vertical beam 601 is vertically connected with the base 101, the first coupling beam 602 is also vertically arranged, the first coupling beam 602 is positioned on the right side of the vertical beam 601, the first coupling beam 602 is parallel to the vertical beam 601, the top of the first coupling beam 602 is positioned on the same horizontal plane with the top of the vertical beam 601, the first coupling beam 602 is positioned above the base 101, the first coupling beam 602 and the vertical beam 601 are connected through four first parallel lever beams 604 to form a cantilever beam structure, four first parallel lever beams 604 are arranged in an array, namely two first parallel lever beams 604 are connected between the top of the first coupling beam 602 and the top of the vertical beam 601 along the horizontal direction, the other two first parallel lever beams 604 are connected between the bottom of the first coupling beam 602 and the bottom of the vertical beam 601 along the horizontal direction, the upper and lower two first parallel lever beams 604 are positioned on the same vertical plane, and the front and rear two first parallel lever beams 604 are positioned on the same horizontal plane; the load support column cap 603 is used for bearing load, the load support column cap 603 is connected with the top of the first coupling beam 602, the load support column cap 603 is located between the two first parallel lever beams 604 at the top, the load end of the load support column cap 603 is located in the middle of the first parallel lever beams 604, and the load support column cap 603 is suspended.
Further to illustrate, referring to fig. 4, the cantilever weighing unit 600 further includes a plurality of elastic reeds 605, the thickness of the elastic reeds 605 may be selected to be 0.2mm, the elastic reeds 605 are in an arc structure, and two elastic reeds 605 are respectively disposed at two ends of each first parallel lever beam 604; specifically, the two elastic reeds 605 at the left end of the first parallel lever beam 604 are arranged up and down, the elastic reed 605 at the upper part is concaved downwards, the elastic reed 605 at the lower part is concaved upwards, so that the left end of the first parallel lever beam 604 is connected with the vertical beam 601 through the two elastic reeds 605, the two elastic reeds 605 at the right end of the first parallel lever beam 604 are also arranged up and down, the elastic reed 605 at the upper part is concaved downwards, and the elastic reed 605 at the lower part is concaved upwards, so that the right end of the first parallel lever beam 604 is connected with the first coupling beam 602 through the two elastic reeds 605; wherein the vertical beam 601, the elastic reed 605, the load supporting column head 603, the first parallel lever beam 604 and the first coupling beam 602 belong to an integrated structure, and casting, boring, milling and other modes can be selected during manufacturing; and, the elastic reeds 605 are symmetrically distributed to form a novel parallel guide structure, which plays a role in supporting and guiding force, and the load on the load supporting column head 603 gathers the force to the first coupling beam 602 through the elastic reeds 605.
Further to describe, the cantilever weighing unit 600 further includes a unbalanced load arm 606, a unbalanced load compensation moment beam 607 and a unbalanced load error adjusting knob 608, where the unbalanced load arm 606 is vertically disposed on the left side of the vertical beam 601, an adjusting gap exists between the unbalanced load arm 606 and the vertical beam 601, the top of the unbalanced load arm 606 is connected with the side wall of the vertical beam 601, the bottom of the unbalanced load arm 606 is provided with the unbalanced load error adjusting knob 608, and the unbalanced load error adjusting knob 608 is in threaded connection with the bottom of the unbalanced load arm 606, so that the rotating unbalanced load error adjusting knob 608 can adjust the gap between the bottom of the unbalanced load arm 606 and the vertical beam 601; the unbalanced load force arm 606 is of an n-type structure, namely, both ends of the bottom of the unbalanced load force arm 606 are provided with unbalanced load error adjusting knobs 608, the top of the unbalanced load force arm 606 is the same as the width of the vertical beam 601, and the unbalanced load force arm 606 and the vertical beam 601 are also of an integrated structure through casting or boring and milling; the offset load error adjusting knob 608 is provided with an adjustable nut, and the offset load arm 606 can be elastically deformed by adjusting the nut, so that the asymmetry of the eight elastic reeds 605 during processing can be compensated.
The offset load compensation moment beam 607 is in a square structure, the offset load compensation moment beam 607 is also positioned on the left side of the vertical beam 601, the offset load compensation moment beam 607 is vertically arranged and positioned right above the offset load moment arm 606, the top of the offset load compensation moment beam 607 is connected with the top of the vertical beam 601, the bottom of the offset load compensation moment beam 607 is connected with the top of the offset load moment arm 606 and is also connected with the vertical beam 601, at the moment, an adjusting gap is also reserved between the offset load compensation moment beam 607 and the vertical beam 601, and the offset load compensation moment beam 607 and the vertical beam 601 are in an integrated structure; when the unbalanced load arm 606 is elastically deformed, the unbalanced load compensation moment beam 607 is microscopically changed under the action of the supporting force of the rack, so that the structural dimensions of the left and right sides of the sensor are changed, the asymmetry caused by machining deviation can be compensated, and the structural symmetry of the sensor body 100 is further ensured.
In order to avoid the reduction of structural stability caused by the overlarge deflection angle of the cantilever weighing unit 600, the right side of the first coupling beam 602 is selectively provided with two limit grooves 609, preferably, the number of the limit grooves 609 is two, and the two limit grooves 609 are arranged on two opposite sides of the first coupling beam 602, so that the lever unit 700 is positioned between the two limit grooves 609; two first parallel lever beam limiting positions 105 are arranged on the base 101, the two first parallel lever beam limiting positions 105 are respectively in one-to-one correspondence with the two corresponding limiting positions 609, a gap is reserved between the first parallel lever beam limiting positions 105 and the corresponding limiting positions 609, namely, the cantilever weighing unit 600 can drive the limiting positions 609 to deflect a set distance up and down, and when the deflection is larger than the set distance, the first parallel lever beam limiting positions 105 limit the distance, for example, the top space between the first parallel lever beam limiting positions 105 and the inside of the limiting positions 609 and the bottom space between the first parallel lever beam limiting positions 105 and the inside of the limiting positions 609 are both 0.5mm.
Further, referring to fig. 5, the lever unit 700 includes a second coupling beam 701, a support beam 702, and a second parallel lever beam 703 as levers, the second coupling beam 701 is connected to a connection end of the second parallel lever beam 703, and the support beam 702 is located at a bottom of the second parallel lever beam 703 as a fulcrum of the second parallel lever beam 703; specifically, the second coupling beam 701 is vertically disposed, the top of the second coupling beam 701 is connected to the connection end of the second parallel lever beam 703, the bottom of the second coupling beam 701 is connected to the first coupling beam 602, the second coupling beam 701 moves up and down synchronously according to the up and down deflection of the cantilever weighing unit 600, at this time, the connection end of the second parallel lever beam 703 is driven to deflect up and down when the second coupling beam 701 moves up and down, and due to the radian of the cantilever weighing unit 600 during the up and down deflection, the bottom of the second coupling beam 701 moves up and down and swings back and forth, preferably, an elastic reed 605 is also disposed on the second coupling beam 701, and the elastic reed 605 is vertically disposed, so that the front and back deflection of the second coupling beam 701 can be eliminated.
The support beam 702 is also vertically arranged, the top of the support beam 702 is connected with the bottom surface of the second parallel lever beam 703, the bottom of the support beam 702 is connected with the base 101 into an integral structure, and in order to meet the elastic connection between the support beam 702 and the second parallel lever beam 703, preferably, an elastic reed 605 is also arranged between the support beam 702 and the second parallel lever beam 703, and the elastic reed 605 is also vertically arranged.
Referring to fig. 6, the adjustment end of the second parallel lever beam 703 extends into the sensor mount 102, the second parallel lever beam 703Two coil mounting holes 301 are formed in the adjusting end, the two coil mounting holes 301 are formed in the arranging direction of the second parallel lever beam 703, a photoelectric sensor gap 704 is formed between the two coil mounting holes 301, the photoelectric sensor gap 704 is formed in the horizontal direction, namely a baffle perpendicular to the adjusting end of the second parallel lever beam 703 is arranged between the two coil mounting holes 301, and the photoelectric sensor gap 704 is formed in the baffle; coil 300 is connected to the adjustment end of second parallel lever beam 703 through two coil mounting holes 301, and photosensor slit 704 is located on the axis of coil 300, specifically, the distance between support beam 702 and second coupling beam 701 is X1, the distance between support beam 702 and photosensor slit 704 is X2, and the lever ratio of second parallel lever beam 703 is Where 2.ltoreq.γ.ltoreq.10, for example, the distance between the support beam 702 and the second coupling beam 701 is 6mm, and the distance between the support beam 702 and the photosensor slit 704 is 30mm, the lever ratio of the second parallel lever beam 703The outer side of the coil 300 is provided with a magnetic steel body 200, the bottom of the magnetic steel body 200 is connected with the base 101, the magnetic steel body 200 is positioned below the adjusting end of the second parallel lever beam 703, and the coil 300 and the magnetic steel body 200 are in clearance fit while the coil 300 and the magnetic steel body 200 are coaxially arranged, so that the coil 300 can move in the inner ring of the magnetic steel body 200 when the adjusting end of the second parallel lever beam 703 is driven up and down.
Further describing, the photoelectric position sensor 400 is mounted on the top of the sensor seat 102, the photoelectric position sensor 400 is opposite to the photoelectric sensor slit 704, the photoelectric position sensor 400 deflects up and down relative to the photoelectric sensor slit 704, the current in the coil 300 is regulated by the temperature compensation control module 802 to drive the right end of the second parallel lever beam 703 to restore to balance, when the photoelectric position sensor 400 is opposite to the photoelectric sensor slit 704, the second parallel lever beam 703 is regulated to balance state, and at this time, the current load weight can be determined according to the current of the coil 300; the sensor seat 102 comprises a sensor base 103 connected with the base 101 and a magnetic steel end cover 104 connected with the top of the sensor base 103; specifically, the sensor base 103 is a U-shaped structure magnetic steel body 200 and is located on the inner side of the sensor base 103, the height of the magnetic steel body 200 is lower than that of the sensor base 103, magnetic steel end cover fixing holes 107 are formed in two sides of the top of the sensor base 103, the sensor base 103 is connected with a magnetic steel end cover 104 through the magnetic steel end cover fixing holes 107, the magnetic steel end cover 104 is located on the outer side of a second parallel lever beam 703, and the photoelectric position sensor 400 is mounted on the magnetic steel end cover 104.
Referring to fig. 7, further explaining, the top of the inner side of the magnetic steel end cover 104 is provided with two oppositely arranged photoelectric position sensor mounting plates 705, the photoelectric position sensor mounting plates 705 are arranged in the same direction with the second parallel lever beams 703, the photoelectric position sensor mounting plates 705 are located on two opposite sides of the baffle, and the photoelectric position sensors 400 are mounted on the photoelectric position sensor mounting plates 705, so that the photoelectric position sensors 400 are opposite to the photoelectric sensor gaps 704.
Similarly, in order to avoid that the downward deflection distance of the adjusting end of the second parallel lever beam 703 is larger, a second parallel lever beam limit 106 is optionally provided at the right end of the magnetic steel end cover 104, the second parallel lever beam limit 106 is in a J-shaped structure, the top of the second parallel lever beam limit 106 is connected with the top of the magnetic steel end cover 104, and the bottom of the second parallel lever beam limit 106 extends to below the bottom of the second parallel lever beam 703 to limit the downward deflection distance of the second parallel lever beam 703 to be too large, for example, when the second parallel lever beam 703 is horizontal, the distance between the bottom of the second parallel lever beam limit 106 and the bottom of the second parallel lever beam 703 may be 0.5mm.
The working process comprises the following steps: the micro-electromagnetic weighing sensor is used with a carrier tray in a selected circular structure, and the carrier tray is mounted on the load support column head 603.
Before use, the micro electromagnetic force weighing sensor needs to be calibrated, and the method is specific:
firstly, selecting the same load to be placed at one corner of a carrier tray, then reading the indication value of the indication value display unit 500, then changing the placement position of the load to weigh again, weighing for a plurality of times, calibrating a micro electromagnetic force weighing sensor if the indication value deviation is large, and completing the calibration if the indication value deviation is smaller than 3 graduation values.
Wherein the weight is generally selected to be weighed at five positions, namely the upper left corner, the upper right corner, the lower left corner and the center of the carrier tray; when the micro electromagnetic force weighing sensor is calibrated, the unbalanced load error adjusting knob 608 is selected to rotate, and the calibration operation is repeated until the calibration is completed.
After the unbalanced load error is adjusted, the sensor is basically in a working state, a load in a range is placed at any position of the carrier tray, gravity is concentrated on the first coupling beam 602 through the elastic reed 605, the first coupling beam 602 transmits force to the second coupling beam 701 to achieve moment redirection, the right end of the second parallel lever beam 703 is supported by the force under the support of the supporting beam 702 to be vertical, the second parallel lever beam 703 drives the photoelectric sensor slit 704 and the coil 300 to deflect upwards, the temperature compensation control module 802 detects the horizontal position change of the second parallel lever beam 703 according to the induction of the photoelectric position sensor 400, therefore, the temperature compensation control module 802 increases the current in the coil 300 to increase the electromagnetic force between the coil 300 and the magnetic steel body 200, so that the coil 300 deflects downwards, the right end of the second parallel lever beam 703 is driven to deflect downwards when the photoelectric position sensor 400 is opposite to the photoelectric sensor slit 704, the second parallel lever beam 703 is restored to the balanced state, the temperature compensation control module 802 calculates the current weight 802 according to the current size in the coil 300, the temperature compensation module acquires the current weight value according to the current weight value in the coil 300, and the temperature compensation module acquires the current weight value, and the current weight value is displayed by the temperature compensation module 500, and the weighing unit is displayed at the end.
In the weighing with the skin removal amount, the load of the sensor may be reduced, and in this case, the current in the coil 300 is correspondingly reduced, and the data of the indication display unit 500 is correspondingly reduced.
Example 2
Based on the micro electromagnetic force weighing sensor provided in embodiment 1, the embodiment provides a dynamic temperature compensation method of the micro electromagnetic force weighing sensor, which comprises the following steps:
s1, performing a temperature rise test and a temperature reduction test on a micro electromagnetic force weighing sensor to obtain indication value differences, temperature differences and zero-position voltage differences of the micro electromagnetic force weighing sensor under the same load and at different temperatures;
s2, fitting the indication value difference, the temperature difference and the zero-position voltage difference obtained in the heating test and the cooling test according to the step S1 to obtain an indication value curve compensation value;
s3, determining a measurement range of the temperature sensor 801 and an index value of the temperature sensor 801, gradually heating up in the measurement range of the temperature sensor 801 according to the index value and performing a load test to obtain index value linear compensation values corresponding to different temperatures;
and S4, compensating the measured value obtained when the micro electromagnetic force weighing sensor is weighed according to the indication curve compensation value and the indication linear compensation value to obtain a final weighing result and displaying the final weighing result.
Step S1 comprises the steps of:
s11, placing the micro electromagnetic force weighing sensor in a high-low temperature box, wherein the temperature of the high-low temperature box is set to be T min ，T min For the lowest temperature of the high-low temperature box, placing a high-low temperature test standard weight on the micro electromagnetic force weighing sensor, and completing the temperature rise test calibration of the micro electromagnetic force weighing sensor to obtain zero voltage Vh of the current coil 300 in the balanced state 0 Measurement Th of temperature sensor 801 0 And an indication value Mh of the indication value display unit 500 0 ；
Specifically, the temperature of the high-low temperature box is firstly adjusted to be T min The constant temperature and humidity rest time of the fixed humidity point is not less than 4 hours, in order to balance the temperature of the whole sensor and a high-low temperature box, a high-low temperature test standard weight with known weight is loaded on a micro electromagnetic force weighing sensor, the high-low temperature test standard weight is usually 200g, the calibration of the micro electromagnetic force weighing sensor is completed, and the temperature rise test calibration temperature T can be obtained at the moment min Coil 30Zero voltage Vh of 0 0 Measured value Th of temperature sensor 801 0 And an indication value Mh of the indication value display unit 500 0 The indication displayed by the indication display unit 500 at this time is an indication when temperature compensation is not performed.
S12, increasing the temperature of the high-low temperature box to T i Then placing a high-low temperature test standard weight on the micro electromagnetic force weighing sensor to obtain zero voltage Vh of the current coil 300 in the balanced state i Measurement Th of temperature sensor 801 i And an indication value Mh of the indication value display unit 500 i ，T i ＝T min +iT rate ，T rate I is the i-th increase of the temperature of the high-low temperature box for the temperature variation;
according to DeltaM i ＝Mh i -Mh 0 、ΔT i ＝Th i -Th 0 And DeltaV i ＝Vh i -Vh 0 Calculating to obtain the indication value difference delta M of the micro electromagnetic force weighing sensor after the temperature of the high-low temperature box is increased for the ith time i Temperature difference DeltaT i And zero voltage difference DeltaV i ：
Wherein in the temperature rise test, the temperature of the high-low temperature box after the first temperature rise is T min +T rate I=1, at which point the zero voltage Vh is obtained 1 Measurement Th of temperature sensor 801 1 And an indication value Mh of the indication value display unit 500 1 Subsequently, the temperature of the high-low temperature box is regulated to T min +2T rate I=2, at which point the zero voltage Vh is obtained 2 Measurement Th of temperature sensor 801 2 And an indication value Mh of the indication value display unit 500 2 The circulation is performed in this way, so that the corresponding zero voltage Vh under a plurality of groups of temperatures in the temperature rise test can be obtained i Measurement Th of temperature sensor 801 i And an indication value Mh of the indication value display unit 500 i 。
S13, judging T i Whether or not it is smaller than the highest temperature T of the high-low temperature box max If yes, go on to step S12, if no, go to step S14;
wherein, according to step 12, a temperature rise test is carried out until the temperature of the high-low temperature box reaches T max At this time, the temperature rise is finished after the data acquisition is completedAnd (5) testing.
S14, placing the micro electromagnetic force weighing sensor in a high-low temperature box, wherein the temperature of the high-low temperature box is set to be T max Placing a high-low temperature test standard weight on the micro electromagnetic force weighing sensor, completing the cooling test calibration of the micro electromagnetic force weighing sensor, and obtaining the zero voltage Vc of the current coil 300 in the balance state 0 Measurement Tc of temperature sensor 801 0 And indication value Mc of indication value display unit 500 0 ；
Wherein, the temperature-reducing test is carried out after the temperature-increasing test is finished, and the temperature-reducing test is also carried out according to T each time rate And cooling, wherein the corresponding cooling times n are equal to the heating times.
S15, reducing the temperature of the high-low temperature box to T n Then, a standard weight is loaded on the micro electromagnetic force weighing sensor to obtain zero voltage Vc of the current coil 300 in the balance state n Measurement Tc of temperature sensor 801 n And indication value Mc of indication value display unit 500 n ，T n ＝T max -nT rate N is the nth time of reducing the temperature of the high-low temperature box;
according to DeltaM n ＝Mc n -Mc 0 、ΔT n ＝Tc n -Tc 0 And DeltaV n ＝Vc n -Vc 0 The method comprises the steps of carrying out a first treatment on the surface of the Calculating to obtain the indication value difference delta M of the micro electromagnetic force weighing sensor after the temperature of the high-low temperature box is reduced for the nth time n Temperature difference DeltaT n And zero voltage difference DeltaV n ：
S16, judging T n Whether or not it is higher than the lowest temperature T of the high-low temperature box min If yes, go on to step S15, if no, go to step S2.
In actual work, the micro electromagnetic force weighing sensor needs to be detected once, a temperature rise test and a temperature reduction test are carried out by placing the micro electromagnetic force weighing sensor in a high-low temperature box, whether the deviation between an indication value obtained by the micro electromagnetic force weighing sensor in the temperature rise test and an indication value obtained by the micro electromagnetic force weighing sensor in the temperature reduction test exceeds a specified value or not is compared, if the deviation exceeds the specified value, the micro electromagnetic force weighing sensor is considered to be unqualified in detection, and the micro electromagnetic force weighing sensor can be used for qualified detection.
The step S2 specifically comprises the following steps:
ΔM obtained from temperature increase test i 、ΔT i And DeltaV i Δm obtained by cooling test n 、ΔT n And DeltaV n Fitting by using a multiple linear regression algorithm to obtain an indication curve compensation value delta M of the micro electromagnetic force weighing sensor:
ΔM＝b 0 +b 1 ΔT+b 2 ΔV+k
T 0 ＝T max -T min
wherein b 0 、b 1 And b 2 Are weight coefficients, k is a temperature subdivision constant, and DeltaT is the actual temperature and Th 0 The difference between the voltage and V is the actual zero voltage and V 0 The difference value between the two values, delta Mh is the difference value between the maximum indication value and the minimum indication value in the temperature rise test, and delta Mc is the difference value between the maximum indication value and the minimum indication value in the temperature reduction test.
Wherein, a plurality of groups of data obtained by the temperature rise test and the temperature reduction test are fitted by a multiple linear regression algorithm to obtain a function of a smooth curve, so that the function can be obtained by the actual temperature and the calibration temperature Th in the temperature rise test 0 The difference between the measured voltage and the actual zero voltage of the coil 300 at the time of weighing balance and the zero voltage Vh obtained by calibration at the time of temperature rise test 0 And the difference value between the two values is obtained to obtain the indication compensation value of the current micro electromagnetic force weighing sensor.
Step S3 comprises the steps of:
s31, placing the micro electromagnetic force weighing sensor in a high-low temperature box, wherein the temperature of the high-low temperature box is set to be t min ，t min The lowest measured value of the temperature sensor 801 is used for completing the temperature calibration of the load test of the micro electromagnetic force weighing sensor;
The measurement range and the graduation value of the temperature sensor 801 can be known according to the model of the temperature sensor 801, and before the micro electromagnetic force weighing sensor is actually used, the deviation between the indication value obtained by sequentially measuring each temperature and the actual weight in the measurement range of the temperature sensor 801 through a standard invention is further obtained, so that the indication value compensation value corresponding to any temperature of the temperature sensor 801 in the measurement range is obtained.
Thereby the micro electromagnetic force weighing sensor is arranged in the high-low temperature box from t min And (3) starting the temperature, increasing the temperature corresponding to the graduation value every time, and performing one-side load test after the temperature is increased.
Load test according to the requirement, weight G with weight equal to one fourth of maximum measuring range of micro electromagnetic force weighing sensor is selected 1 Weight G with weight equal to two-fourth of maximum measuring range of micro electromagnetic force weighing sensor 2 Weight G with weight equal to three quarters of maximum measuring range of micro electromagnetic force weighing sensor 3 And weight G with weight equal to maximum measuring range of micro electromagnetic force weighing sensor 4 Recording the micro electromagnetic force weighing sensor under the load of 0 and the weight G respectively 1 Weight G 2 Weight G 3 And weight G 4 The time indication value display unit 500 indicates that the standard weight is G when the load is 0 0 The weight is 0, and the indication value at the moment is the direct measurement result when compensation is not carried out, so that the load test of the micro electromagnetic force weighing sensor is completed.
S32, increasing the temperature of the high-low temperature box to t x Standard weights with different weights are respectively weighed through micro electromagnetic force weighing sensors to obtain the current temperature difference delta t x Indicating value difference corresponding to different standard weights
Δt x ＝t x -t min
t x ＝t min +xt rate
Wherein x is the x-th increase in the temperature of the high-low temperature boxJ is the j standard weight, G j Is the weight of the j-th standard weight,for the temperature of the high-low temperature box to be equal to t x When the indicator value of the j standard weight is weighed, t x T is the current temperature of the temperature box rate An index value for the temperature sensor 801;
wherein, with the temperature adjustment of the high-low temperature box, a load test is carried out after each temperature rise, thereby obtaining five indication value differences at the current temperature
S33, judging t x Whether or not it is smaller than the highest measured value t of the temperature sensor 801 max If yes, go on to step S32, if no, go to step S34;
wherein, load test is carried out for a plurality of times in the heating process until the corresponding indication difference at each temperature in the measuring range of the temperature sensor 801 is completedThe load test is then ended.
S34, indicating value difference obtained when carrying out load test according to different temperatures Calculating to obtain an indication linear compensation value delta m corresponding to each temperature in the range of the measuring range of the temperature sensor 801 x ：
Δm x ＝a x m x +b x
Wherein Δm is x For the temperature sensor 801 to have a temperature equal to t x Time indication linear compensation value, a x For the temperature sensor 801 to have a temperature equal to t x Scale factor of time, b x For the temperature sensor 801 to have a temperature equal to t x Offset at time, m x For the temperature sensor 801 to have a temperature equal to t x Measurement value of time micro electromagnetic force weighing sensor；
Wherein, in the measuring range of the temperature sensor 801, the temperature is t 1 ～t max Wherein each temperature corresponds to four groups of data, namely the standard weight G j Mass and weight standard G j The measured value is a value obtained by directly calculating the micro electromagnetic force weighing sensor without any compensation, so that the indication linear compensation value at the current temperature is obtained according to four groups of data, and the test is performed for a plurality of times, so that each indication of the temperature sensor 801 corresponds to a calculation formula of the real-time linear compensation value.
An indication t of the actual temperature corresponding to the temperature sensor 801 x For example, if the measured index value of the temperature sensor 801 is 0.1 ℃, the actual temperature is 22.23 ℃, and the measured temperature of the side temperature sensor 801 is 22.2 ℃, the same will be matched with t x The corresponding function is calculated when =22.2 ℃, when the actual temperature is less than t min Or greater than t max When the temperature sensor 801 is actually compensated, the temperature compensation control module 802 measures the temperature of the temperature sensor 801 to match the corresponding linear compensation function of the indication value, so as to calculate the linear temperature compensation value of the indication value at the temperature.
Step S4
The method comprises the following steps:
s41, weighing the load to be measured through the micro electromagnetic force weighing sensor to obtain a measured value m of the micro electromagnetic force weighing sensor s Indication t of temperature sensor 801 s And zero voltage V of coil 300 s ；
The measurement value m here s The measurement value of the micro electromagnetic force weighing sensor when the temperature compensation is not performed is calculated by the micro electromagnetic force weighing sensor according to the prior art when the second parallel lever beam 703 is adjusted to the equilibrium state.
S42, indicating a value t according to the real-time temperature sensor 801 s Indication value linear compensation value meter when matching same temperatureCalculation formula according to Deltam s ＝a s m s +b s Obtaining a real-time linear compensation value delta m s ；
When the temperature sensor 801 measures the current temperature t s When the temperature compensation control module 802 matches the obtained temperature t s The corresponding linear compensation value calculation formula then measures the value m s Substituting the linear compensation value delta m into the formula to obtain the linear compensation value delta m at the current temperature s 。
S43, according to Δm=b 0 +b 1 ΔT+b 2 ΔV+k，ΔT＝t s -Th 0 ，ΔV＝V s -Vh 0 Obtaining a real-time indication curve compensation value delta M;
s44, according to m=m s +Δm s The +Δm results in a final weighing result and is displayed by the indication display unit 500.
The unit of the temperature value measured and displayed by the temperature sensor 801 is the same as the unit of the temperature value of the indication value obtained by the temperature sensor 801 when the measurement is performed in step S3, and may be, for example, all of them may be selected to be at the temperature.
The above is an embodiment of the present application. The foregoing embodiments and the specific parameters in the embodiments are only for clearly describing the verification process of the application, and are not intended to limit the scope of the application, which is defined by the claims, and all equivalent structural changes made by applying the descriptions and the drawings of the application are included in the scope of the application.
Claims (10)
1. The micro-electromagnetic force weighing sensor is characterized by comprising a sensor body (100), an electromagnetic force balancing unit and a temperature compensation display module, wherein the sensor body (100) comprises a base (101), a cantilever weighing unit (600) and a lever unit (700), the cantilever weighing unit (600) is arranged at one end of the base (101), the electromagnetic force balancing unit is arranged at the other end of the base (101), the lever unit (700) is arranged between the electromagnetic force balancing unit and the cantilever weighing unit (600), the connecting end of the lever unit (700) is connected with the cantilever weighing unit (600), and the adjusting end of the lever unit (700) extends to the inner side of the electromagnetic force balancing unit, and the electromagnetic force balancing unit is in communication connection with the temperature compensation display module.
2. The micro electromagnetic force weighing sensor according to claim 1, wherein the temperature compensation display module comprises an indication value display unit (500), a temperature compensation unit (800) and a temperature sensor (801), the temperature sensor (801) is in communication connection with the indication value display unit (500) through the temperature compensation unit (800), and the temperature sensor (801) is arranged on the base (101).
3. The micro electromagnetic force weighing sensor according to claim 2, wherein the cantilever weighing unit (600) comprises a vertical beam (601), a first coupling beam (602), a load supporting column (603), four first parallel lever beams (604) and a plurality of elastic reeds (605), wherein the vertical beam (601) is vertically arranged at one end of the base (101), the first coupling beam (602) is vertically arranged above the base (101), the first coupling beam (602) is parallel to the vertical beam (601), the four first parallel lever beams (604) are arranged between the first coupling beam (602) and the vertical beam (601), the first parallel lever beams (604) are arranged parallel to the base (101), the load supporting column (603) is arranged at the top of the first coupling beam (602), the load supporting column (603) is arranged between the vertical beam (601) and the first coupling beam (602), the load supporting column (603) is arranged between the first parallel lever beams (604), and the bottom of the load supporting column (603) is connected with the lever unit (700); the elastic reeds (605) are respectively positioned between the corresponding vertical beam (601) and the first parallel lever beam (604) and between the first coupling beam (602) and the first parallel lever beam (604).
4. A micro electromagnetic force weighing sensor according to claim 3, characterized in that the cantilever weighing unit (600) further comprises a bias load arm (606), a bias load compensation moment beam (607) and a bias load error adjusting knob (608), wherein the bias load arm (606) is positioned at the bottom of the vertical beam (601) and is parallel to the vertical beam (601), an adjusting gap is arranged between the bias load arm (606) and the vertical beam (601), the bias load error adjusting knob (608) is in threaded connection with the bottom of the bias load arm (606), and the bias load error adjusting knob (608) passes through the adjusting gap and is in contact with the vertical beam (601); the unbalanced load compensation moment beam (607) is arranged in parallel with the unbalanced load moment arm (606), the bottom of the unbalanced load compensation moment beam (607) is connected to the top of the unbalanced load moment arm (606), and the top of the unbalanced load compensation moment beam (607) is connected to the top of the vertical beam (601);
the lever unit (700) comprises a second coupling beam (701), a support beam (702) and a second parallel lever beam (703); the second coupling beam (701) is vertically arranged, the bottom end of the second coupling beam (701) is connected with the bottom end of the first coupling beam (602), the top end of the second coupling beam (701) is connected with the connecting end of the second parallel lever beam (703), the adjusting end of the second parallel lever beam (703) extends into the electromagnetic force balancing unit, the coil (300) is connected with the bottom surface of the other end of the second parallel lever beam (703), the photoelectric position sensor (400) is oppositely arranged with the other end of the second parallel lever beam (703), the supporting beam (702) is vertically arranged, the supporting beam (702) is connected between the second parallel lever beam (703) and the base (101), and the supporting beam (702) is positioned between the connecting end of the second parallel lever beam (703) and the adjusting end of the second parallel lever beam.
5. The micro-electromagnetic force weighing sensor according to claim 4, wherein the electromagnetic force balancing unit comprises a sensor base (102), a magnetic steel body (200), a coil (300) and a photoelectric position sensor (400), the sensor base (102) comprises a sensor base (103) and a magnetic steel end cover (104) connected with the top of the sensor base (103), two oppositely arranged photoelectric position sensor mounting plates are arranged on the top of the inner side of the magnetic steel end cover (104), the photoelectric position sensor mounting plates and a second parallel lever beam (703) are arranged in the same direction, a photoelectric sensor gap (704) is arranged on the second parallel lever beam (703), the photoelectric sensor gap (704) is positioned between the two photoelectric position sensor mounting plates (705), the photoelectric position sensor (400) is arranged on any photoelectric position sensor mounting plate (705), and the photoelectric position sensor (400) is oppositely arranged with the photoelectric sensor gap (704); the sensor base (103) is located the other end of base (101), magnet steel body (200) set up in sensor base (103), and magnet steel body (200) are connected with base (101), coil (300) are along the axis setting of magnet steel body (200) in magnet steel body (200), coil (300) are connected with the bottom surface of lever unit (700) regulation end.
6. The dynamic temperature compensation method of the micro electromagnetic force weighing sensor is characterized by comprising the following steps of:
s1, performing a temperature rise test and a temperature reduction test on a micro electromagnetic force weighing sensor to obtain indication value differences, temperature differences and zero-position voltage differences of the micro electromagnetic force weighing sensor under the same load and at different temperatures;
s2, fitting the indication value difference, the temperature difference and the zero-position voltage difference obtained in the heating test and the cooling test according to the step S1 to obtain an indication value curve compensation value;
s3, determining a measurement range of the temperature sensor (801) and an index value of the temperature sensor (801), gradually heating up in the measurement range of the temperature sensor (801) according to the index value, and performing a load test to obtain indication linear compensation values corresponding to different temperatures;
and S4, compensating the measured value obtained when the micro electromagnetic force weighing sensor is weighed according to the indication curve compensation value and the indication linear compensation value to obtain a final weighing result and displaying the final weighing result.
7. The method for dynamic temperature compensation of a micro-electromagnetic weighing sensor according to claim 6, wherein said step S1 comprises the steps of:
s11, placing the micro electromagnetic force weighing sensor in a high-low temperature box, wherein the temperature of the high-low temperature box is set to be T min ，T min For the lowest temperature of the high-low temperature box, placing a high-low temperature test standard weight on the micro electromagnetic force weighing sensor, and completing the temperature rise test calibration of the micro electromagnetic force weighing sensor to obtain zero voltage Vh of the current coil (300) in the balance state 0 Measurement Th of temperature sensor (801) 0 And an indication value Mh of an indication value display unit (500) 0 ；
S12, increasing the temperature of the high-low temperature box to T i Then placing a high-low temperature test standard weight on the micro electromagnetic force weighing sensor to obtain zero voltage Vh of the current coil (300) in the balance state i Measurement Th of temperature sensor (801) i And an indication value Mh of an indication value display unit (500) i ，T i ＝T min +iT rate ，T rate I is the i-th increase of the temperature of the high-low temperature box for the temperature variation;
according to DeltaM i ＝Mh i -Mh 0 、ΔT i ＝Th i -Th 0 And DeltaV i ＝Vh i -Vh 0 Calculating to obtain the indication value difference delta M of the micro electromagnetic force weighing sensor after the temperature of the high-low temperature box is increased for the ith time i Temperature difference DeltaT i And zero voltage difference DeltaV i ：
S13, judging T i Whether or not it is smaller than the highest temperature T of the high-low temperature box max If yes, go on to step S12, if no, go to step S14;
s14, placing the micro electromagnetic force weighing sensor in a high-low temperature box, wherein the temperature of the high-low temperature box is set to be T max Placing a high-low temperature test standard weight on the micro electromagnetic force weighing sensor, and completing the cooling test calibration of the micro electromagnetic force weighing sensor to obtain zero voltage Vc of the current coil (300) in a balanced state 0 Measurement value Tc of temperature sensor (801) 0 And an indication value Mc of an indication value display unit (500) 0 ；
S15, reducing the temperature of the high-low temperature box to T n Then, a standard weight is loaded on the micro electromagnetic force weighing sensor to obtain zero voltage Vc of the current coil (300) in the balance state n Measurement value Tc of temperature sensor (801) n And an indication value Mc of an indication value display unit (500) n ，T n ＝T max -nT rate N is the nth time of reducing the temperature of the high-low temperature box;
according to DeltaM n ＝Mc n -Mc 0 、ΔT n ＝Tc n -Tc 0 And DeltaV n ＝Vc n -Vc 0 The method comprises the steps of carrying out a first treatment on the surface of the Calculating to obtain the indication value difference delta M of the micro electromagnetic force weighing sensor after the temperature of the high-low temperature box is reduced for the nth time n Temperature difference DeltaT n And zero voltage difference DeltaV n ：
S16, judging T n Whether or not it is higher than the lowest temperature T of the high-low temperature box min If yes, go on to step S15, if no, go to step S2.
8. The method for dynamic temperature compensation of micro-electromagnetic weighing sensor according to claim 7, wherein the step S2 is specifically:
ΔM obtained from temperature increase test i 、ΔT i And DeltaV i Δm obtained by cooling test n 、ΔT n And DeltaV n Fitting by using a multiple linear regression algorithm to obtain an indication curve compensation value delta M of the micro electromagnetic force weighing sensor:
ΔM＝b 0 +b 1 ΔT+b 2 ΔV+k
T 0 ＝T max -T min
wherein b 0 、b 1 And b 2 Are weight coefficients, k is a temperature subdivision constant, and DeltaT is the actual temperature and Th 0 The difference between the voltage and V is the actual zero voltage and V 0 The difference value between the two values, delta Mh is the difference value between the maximum indication value and the minimum indication value in the temperature rise test, and delta Mc is the difference value between the maximum indication value and the minimum indication value in the temperature reduction test.
9. The method for dynamic temperature compensation of a micro-electromagnetic weighing sensor according to claim 8, wherein said step S3 comprises the steps of:
s31, placing the micro electromagnetic force weighing sensor in a high-low temperature box, wherein the temperature of the high-low temperature box is set to be t min ，t min Completing the temperature calibration of the load test of the micro electromagnetic force weighing sensor for the lowest measured value of the temperature sensor (801);
s32, increasing the temperature of the high-low temperature box to t x General purpose medicineThe excessive micro electromagnetic force weighing sensor respectively weighs standard weights with different weights to obtain the current temperature difference delta t x Indicating value difference corresponding to different standard weights
Δt x ＝t x -t min
t x ＝t min +xt rate
Wherein x is the x-th increase of the temperature of the high-low temperature box, j is the j-th standard weight, G j Is the weight of the j-th standard weight,for the temperature of the high-low temperature box to be equal to t x When the indicator value of the j standard weight is weighed, t x T is the current temperature of the temperature box rate Is an index value of the temperature sensor (801);
s33, judging t x Whether or not it is smaller than the highest measured value t of the temperature sensor (801) max If yes, go on to step S32, if no, go to step S34;
S34, indicating value difference obtained when carrying out load test according to different temperaturesCalculating to obtain an indication linear compensation value delta m corresponding to each temperature in the measuring range of the temperature sensor (801) x ：
Δm x ＝a x m x +b x
Wherein Δm is x For the temperature sensor (801) to have a temperature equal to t x Time indication linear compensation value, a x For the temperature sensor (801) to have a temperature equal to t x Scale factor of time, b x Is equal to the temperature of the temperature sensor (801)t x Offset at time, m x For the temperature sensor (801) to have a temperature equal to t x And measuring values of the micro electromagnetic force weighing sensor.
10. The method for dynamic temperature compensation of a micro-electromagnetic weighing sensor according to claim 9, wherein said step S4 comprises the steps of:
s41, weighing the load to be measured through the micro electromagnetic force weighing sensor to obtain a measured value m of the micro electromagnetic force weighing sensor s Indication value t of temperature sensor (801) s Zero voltage V of the sum coil (300) s ；
S42, indicating a value t according to a real-time temperature sensor (801) s The real-time linear compensation value delta m is obtained by matching the calculation formula of the indication value linear compensation value when the same temperature is adopted s ；
S43, according to Δm=b 0 +b 1 ΔT+b 2 ΔV+k，ΔT＝t s -Th 0 ，ΔV＝V s -Vh 0 Obtaining a real-time indication curve compensation value delta M;
s44, according to m=m s +Δm s The +Δm results in a final weighing result and is displayed by an indication display unit (500).
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