CN104374453B - Multichannel digital intelligent correction weighing sensor for offset load error and weighing method thereof - Google Patents
Multichannel digital intelligent correction weighing sensor for offset load error and weighing method thereof Download PDFInfo
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- CN104374453B CN104374453B CN201410722524.1A CN201410722524A CN104374453B CN 104374453 B CN104374453 B CN 104374453B CN 201410722524 A CN201410722524 A CN 201410722524A CN 104374453 B CN104374453 B CN 104374453B
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- 238000005303 weighing Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 11
- 229920001971 elastomer Polymers 0.000 claims abstract description 23
- 239000000806 elastomer Substances 0.000 claims abstract description 23
- 238000004891 communication Methods 0.000 claims abstract description 15
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 238000009434 installation Methods 0.000 claims description 11
- 239000003755 preservative agent Substances 0.000 claims description 5
- 230000002335 preservative effect Effects 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000003466 welding Methods 0.000 abstract description 2
- 230000003111 delayed effect Effects 0.000 description 11
- 238000012545 processing Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
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- 239000002699 waste material Substances 0.000 description 2
- 206010041067 Small cell lung cancer Diseases 0.000 description 1
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- 210000003298 dental enamel Anatomy 0.000 description 1
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- 230000002277 temperature effect Effects 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Force In General (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention relates to a multichannel digital intelligent correction weighing sensor for unbalance loading errors and a weighing method thereof, and belongs to the technical field of sensor structures. Including the elastomer, the elastomer is by the left fixed part at middle crossbeam and both ends, right side fixed part constitutes, be formed with the mounting hole on the left fixed part, the lower surface of right side fixed part is equipped with the mounting hole, the upper surface of right side fixed part is equipped with the recess that is used for placing the circuit board, the inside of crossbeam is equipped with a plurality of through-holes that run through the crossbeam, on the crossbeam, the position that the lower surface corresponds the through-hole is the strain area promptly, on the crossbeam, the lower surface is equipped with two sets of resistance strain gauge respectively, every resistance strain gauge of group constitutes by four resistance strain gauges, four sets of resistance strain gauge pass through wire and circuit board looks welding, the circuit board is connected with the communication of outside display element, on the crossbeam, it has the anticorrosive. The invention has the advantages of no need of repair and adjustment, convenient operation, labor and time saving and high measurement precision.
Description
Technical field
The present invention relates to a kind of intelligently amendment weighing sensor and its weighing technique of multichannel digital uneven loading error, belong to
Sensor construction technical field.
Background technology
First, traditional single-point resistance strain weighing transducer in theory have stronger offset load resistance, but by
The inhomogeneities of error, the deviation of patch location and strain ga(u)ge itself material produced in machining etc. reason, this
All can cause single-point resistance strain weighing transducer to there is serious uneven loading error, and amendment is must be accorded to for this to answer
Use in electronic scale.The method corrected at present is that weighing sensor is attached on test platform, at the center of platform and four angles
On apply the load of 1/3 range successively, according to the size of its output, frustrated with file and repair different positions to be modified.Moreover,
When sensor is attached on weighing platform, due to the difference of the rigidity of weighing platform, mounting surface is different, assembles the difference of torque, also needs secondary
Refine.This wastes time and energy very much for high-precision weighing sensor, and is extremely difficult to two grades of scales to uneven loading error
Requirement.And weighing sensor is after uneven loading error amendment is carried out, original preservative treatment layer is destroyed, also needs to re-start
Protective treatment, and protection effect is difficult to reach previous level.
Furthermore, all there is certain measurement error in resistance strain weighing transducers all at present, cause these errors
The reason for have inside and outside.The influence of wherein temperature is the most notable.The compensation of traditional temperature influence error is by temperature
Degree experiment, the size exported according to temperature welds the sensitivity temperature compensation rate semifixed resistor and interception different length of different resistances
Enamel covered wire compensate.Disadvantage of this is that the sensitivity temperature compensation rate that need to prepare a large amount of different resistances finely tunes electricity
Resistance, it is time-consuming, the temperature compensation of a variety of analog or digital formulas is generated for this, but substantially belong to static temperature benefit
Repay；
Secondly, the degree of accuracy of resistance strain weighing transducer and the Cai Liao ﹑ temperature of sensor and the load applied have
Close, most of artifical resistance strain gauge load cells are to reach by adjusting in analog circuit discrete component to compensate
Tolerance requirements.Because workload needed for the franchise by circuit element, limited range and compensation is limited, and it is unable to reach
The higher degree of accuracy.
The content of the invention
The need use existed it is an object of the invention to solve above-mentioned prior art frustrates the mode of repairing and carries out weighing precision adjustment,
Waste time and energy, the preservative treatment layer outside destruction weighing sensor reduces protection effect, and need to compensate electricity with temperature control
Resistance, temperature zero compensation resistance, offset output compensation resistance carry out temperature control, temperature offset output, the benefit of offset output
Repay, the low technical problem of time-consuming and precision need not be frustrated there is provided one kind trims whole, easy to operate, saving of work and time, measurement accuracy
High multichannel digital uneven loading error intelligently corrects weighing sensor.
Multichannel digital uneven loading error intelligently corrects weighing sensor, and it is characterized in that including by aluminum alloy materials
The elastomer 1 being made, elastomer 1 is made up of left fixed part 3, the right fixed part 4 at middle crossbeam 2 and two ends, two fixed parts
It is structure as a whole with crossbeam 2, mounting hole 5 is formed with left fixed part 3, the lower surface of right fixed part 4 is provided with mounting hole 5, and the right side is solid
The upper surface for determining portion 4 is provided with the groove 12 for being used for placing wiring board 6, and the inside of crossbeam 2 is provided with multiple through holes 7 through crossbeam 2,
The position of the upper and lower surface correspondence through hole 7 of crossbeam 2 is strain regions, and the upper and lower surface of crossbeam 2 is respectively equipped with two groups of resistance should
Become device, every group of resistance-strain device is constituted by four strain ga(u)ges, and four groups of resistance-strain devices pass through wire and circuit
Plate 6 is mutually welded, and the communication of wiring board 6 and outernal display unit 13 be connected, upper and lower two surfaces of crossbeam 2 and groove 12 outside
Preservative treatment layer is coated with surface；
The cross section of the through hole 7 is in petal-shaped, and the position of the upper and lower surface correspondence petal-shaped through hole 7 of crossbeam 2 is should
Become area, the side of petal-shaped through hole 7 is by four 7-1 of diameter identical semicircle I, the 7-2 of semicircle II, the 7-3 of semicircle III, the 7-4 of semicircle IV
Composition, the upper and lower surface of crossbeam 2 is respectively equipped with two groups of resistance-strain devices, the installation of two groups of resistance-strain devices of upper surface
The 7-1 of semicircle I of position and two petal-shaped through holes 7, the 7-2 of semicircle II position are corresponding, two groups of resistance-strains dress of lower surface
The 7-3 of semicircle III of the installation site put and two petal-shaped through holes 7, the 7-4 of semicircle IV position are corresponding；
The cross section of the through hole 7 is rounded or square or ellipse, and the upper and lower surface correspondence of crossbeam 2 is circular logical
The position in hole 7 is strain regions, and the upper and lower surface of crossbeam 2 is respectively equipped with two groups of resistance-strain devices, the peace of resistance-strain device
The position of the holding position manhole 7 adjacent with two is corresponding；
The resistance-strain device be by four in matts shape arrange strain ga(u)ges 8 constitute, strain ga(u)ge 8 according to
It is secondary to be connected by wire, form Wheatstone bridge；
The wiring board 6 is provided with single-chip microcomputer 9 and power circuit, and single-chip microcomputer 9 is connected with temperature measuring circuit 15, monolithic
The input of machine 9 is also associated with four A/D converters 10, the input of A/D converter 10 and answers device to pass through wire phase with resistance
Connection, A/D converter 10 and resistance are additionally provided with filter circuit 11 between answering device；
The left fixed part 3 is connected with the scale pan, and right fixed part 4 is connected with base；
The width of the crossbeam 2 is 30 millimeters, and strain ga(u)ge 8 is affixed on the upper surface of crossbeam 2 or lower surface away from neutrality
At layer 5.36mm；
Offered on the right fixed part 4 for the through hole 13 through wire, a surface side wall of groove 12, which is provided with, to be used for
Portal 14 through cable；
The wiring board 6 is connected by cable with outernal display unit communication.
Multichannel digital uneven loading error intelligently amendment weighing sensor Weighing method, its be characterized in that including with
Lower step：
1）, load is applied on elastomer 1, make elastomer 1 upper and lower four strain regions produce with magnitude of load into
The elasticity of flexure deformation of ratio；
2）, by applying the Wheatstone bridge of driving voltage by the resistance of strain ga(u)ge 8 in four groups of resistance-strain devices
Change be converted into voltage signal output；
3）, four groups of Wheatstone bridge outputs voltage signal filtered out by filter circuit 11 A/D conversions be conveyed to after noise
Data signal is sent to single-chip microcomputer 9 by device 10, A/D converter 10, and elastomer 1 can be monitored in real time by temperature measuring circuit 15
Temperature, and temperature information is sent to single-chip microcomputer 9；
4）, single-chip microcomputer 9 is to step 3）Received multichannel measurement data are handled, and are believed according to the temperature collected
Breath is digitized compensation calculation；
5）, by TXD and RXD asynchronous communication interfaces set on single-chip microcomputer 9 data are sent to outside by cable
Display unit 13.
The present invention multichannel digital uneven loading error intelligently amendment weighing sensor, smart structural design, crossbeam it is interior
Multiple through holes through crossbeam set by portion, the upper and lower surface of the crossbeam position corresponding with through hole is strain regions, in strain regions
Upper installation resistance-strain device, resistance-strain device is connected with single-chip computer control system communication, therefore when load is applied to elasticity
When on body, upper and lower four strain regions of elastomer produce the elasticity of flexure deformation proportional to magnitude of load, are swashed by applying
Encouraging the Wheatstone bridge of voltage, that the change of the strain ga(u)ge resistance in four groups of resistance-strain devices is converted into voltage signal is defeated
Go out, single-chip computer control system is handled received multichannel measurement data, and carried out according to the temperature information collected
Digitized compensation is calculated, and outernal display unit, said process are sent data to finally by TXD and RXD asynchronous communication interfaces
Realize advantages below：1st, repaiied on a single-point type weighing sensor without frustrating, one-time detection can be just completed to uneven loading error
Digital intelligent amendment, and amendment precision greatly improve, in that context it may be convenient to meet requirement of 2 grades of scales to uneven loading error；2nd, lead to
Cross and processing is digitized to the voltage signal that Wheatstone bridge is exported, resistance, temperature control are compensated without temperature control
Linearisation adjustment and compensation rate semifixed resistor, temperature zero compensation resistance, offset output compensation resistance, you can complete temperature sensitive
Degree, temperature zero point, the compensation of offset output, and compensation precision improves an order of magnitude, can easily meet 2 grades of scales to temperature
The requirement of error；3rd, by being digitized processing to the voltage signal that Wheatstone bridge is exported, realize to resistance-strain type
The linear of weighing sensor output, creep, delayed digitlization amendment, improve precision of resistance strain weighing transducer etc.
Level；4th, it is that product up-gradation and fault diagnosis are provided conveniently using the online firmware upgrade of sensor；5th, communicated and assisted using instruction type
View, reduces data communication frequency, substantially reduces the power consumption of sensor.In summary, reasonable in design of the present invention, in weighing apparatus
Field has good application prospect.
Brief description of the drawings
Fig. 1：The multichannel digital uneven loading error of the embodiment of the present invention 1 intelligently corrects the structural representation of weighing sensor
Figure；
Fig. 2：Fig. 1 A-A cuts open structural representation；
Fig. 3：Fig. 1 A is to structural representation；
Fig. 4：The multichannel digital uneven loading error of the embodiment of the present invention 1 intelligently corrects the upper of the elastomer of weighing sensor
Surface, lower surface wiring schematic diagram；
Fig. 5：The structural representation of the embodiment of the present invention 2；
Fig. 6：The structural representation of the embodiment of the present invention 3；
Fig. 7：The structural representation of the embodiment of the present invention 4；
Fig. 8：The present invention is located at the first group of resistance-strain device, filter circuit, A/D change-over circuits of the upper surface of crossbeam 2
Wiring diagram；
Fig. 9：The present invention is located at the second group of resistance-strain device, filter circuit, A/D change-over circuits of the upper surface of crossbeam 2
Wiring diagram；
Figure 10：First group strain device, filter circuit, the wiring of A/D change-over circuit of the present invention located at the lower surface of crossbeam 2
Figure；
Figure 11：Second group strain device, filter circuit, the wiring of A/D change-over circuit of the present invention located at the lower surface of crossbeam 2
Figure.
Figure 12：Single-chip microcomputer of the present invention, display unit, the wiring diagram of temperature measuring circuit；
Figure 13：The wiring diagram of power circuit of the present invention.
Embodiment
The embodiment of the present invention is provided below with reference to accompanying drawing, for the present invention is described further.
Embodiment 1
The multichannel digital uneven loading error of the present embodiment intelligently amendment weighing sensor, including be made up of aluminum alloy materials
Elastomer 1, elastomer 1 is made up of left fixed part 3, the right fixed part 4 at middle crossbeam 2 and two ends, two fixed parts with it is horizontal
Beam 2 is structure as a whole, and mounting hole 5 is formed with left fixed part 3, and the lower surface of right fixed part 4 is provided with mounting hole 5, right fixed part 4
Upper surface be provided with and be used to place the groove 12 of wiring board 6, the inside of crossbeam 2 is provided with two through holes 7 for running through crossbeam 2, crossbeam 2
The position of upper and lower surface correspondence through hole 7 be strain regions, the upper and lower surface of crossbeam 2 is respectively equipped with two groups of resistance-strains dresses
Put, every group of resistance-strain device is constituted by four strain ga(u)ges, four groups of resistance-strain devices pass through wire and the phase of wiring board 6
Welding, wiring board 6 is connected with the communication of outernal display unit 13, on upper and lower two surfaces of crossbeam 2 and the outer surface of groove 12
It is coated with preservative treatment layer；The cross section of through hole 7 is in petal-shaped, the position of the upper and lower surface correspondence petal-shaped through hole 7 of crossbeam 2
Put as strain regions, the side of petal-shaped through hole 7 is by four 7-1 of diameter identical semicircle I, the 7-2 of semicircle II, the 7-3 of semicircle III, half
Circle IV 7-4 compositions, the upper and lower surface of crossbeam 2 is respectively equipped with two groups of resistance-strain devices, two groups of resistance-strain devices of upper surface
The 7-1 of semicircle I of installation site and two petal-shaped through holes 7, the 7-2 of semicircle II position it is corresponding, two groups of resistance of lower surface
The 7-3 of semicircle III of the installation site of strain device and two petal-shaped through holes 7, the 7-4 of semicircle IV position are corresponding.Resistance-strain
Device is made up of four strain ga(u)ges 8 arranged in matts shape, and wherein strain ga(u)ge 8 can select model
BCF350-3AA（23）Strain ga(u)ge, strain ga(u)ge 8 passes sequentially through wire and is connected, and forms Wheatstone bridge；Circuit
Plate 6 is provided with single-chip microcomputer 9 and power circuit, and single-chip microcomputer 9 is connected with temperature measuring circuit 15, and the input of single-chip microcomputer 9 also connects
Be connected to four A/D converters 10, the input of A/D converter 10 answers device to be connected by wire with resistance, A/D converter 10
Filter circuit 11 is additionally provided between answering device with resistance；Left fixed part 3 is connected with the scale pan, and right fixed part 4 is connected with base；
The width of crossbeam 2 is 30 millimeters, and strain ga(u)ge 8 is affixed on the upper surface of crossbeam 2 or lower surface at away from neutral line 5.36mm；It is right
Offered on fixed part 4 for the through hole 13 through wire, a surface side wall of groove 12, which is provided with, is used for going out through cable
Hole；Wiring board 6 is connected by cable with outernal display unit communication.
Multichannel digital uneven loading error intelligently corrects the Weighing method of weighing sensor, comprises the following steps：
1）, load is applied on elastomer 1, make elastomer 1 upper and lower four strain regions produce with magnitude of load into
The elasticity of flexure deformation of ratio；
2）, calculated by mechanical analysis, according to the rule of its geometric distortion, using 8~16 diverse location adhering resistances
Strain gauge (such as 30 mm wide elastomers, strain ga(u)ge 8 is attached to strain regions at neutral line 5.36mm), constitutes multiple favours
Stone electric bridge（S1, S2 ... ..SN), referring to accompanying drawing 8-11, powered for bridge voltage VCC to S1, bridge is exported under force
One 0~6mV analog signal；
3）, four groups of Wheatstone bridge output voltage signal by C1, C2, C3, which is filtered out, gives U2 high precision analogues after noise
A/D converter 10, transfers data to single-chip microcomputer 9, similarly S2, S3 by two interfaces of SDO and SCLC ... .SN also will measurement
Data are sent to single-chip microcomputer 9, and the temperature measuring circuit being made up of RT temperature sensors and R8 gives the temperature signal of elastomer
U1；
4）, single-chip microcomputer 9 is to step 3）Received multichannel measurement data are handled, and are believed according to the temperature collected
Breath is digitized compensation calculation；
5）, by TXD and RXD asynchronous communication interfaces set on single-chip microcomputer 9 data are sent to outside by cable
Display unit 13.
Embodiment 2
The present embodiment and the difference of embodiment 1 are：The cross section of through hole 7 is rounded, the upper and lower surface correspondence of crossbeam 2
The position of manhole 7 is strain regions, and the upper and lower surface of crossbeam 2 is respectively equipped with two groups of resistance-strain devices, resistance-strain dress
The position of the installation site the put manhole 7 adjacent with two is corresponding.
Embodiment 3
The present embodiment and the difference of embodiment 1 are：The cross section of the through hole 7 is in square, the upper and lower surface of crossbeam 2
The position of correspondence manhole 7 is strain regions, and the upper and lower surface of crossbeam 2 is respectively equipped with two groups of resistance-strain devices, and resistance should
The position for becoming the installation site manhole 7 adjacent with two of device is corresponding.
Embodiment 4
The present embodiment and the difference of embodiment 1 are：The cross section of the through hole 7 is oval, the upper and lower table of crossbeam 2
The position of face correspondence manhole 7 is strain regions, and the upper and lower surface of crossbeam 2 is respectively equipped with two groups of resistance-strain devices, resistance
The position of the installation site of the strain device manhole 7 adjacent with two is corresponding.
The key for improving weighing sensor weighing precision is to reduce the influence of inside and outside factor.Reach higher precision
Need by being referred to as the process of compensation come " adjustment " each weighing sensor.Though the purpose of compensation be temperature or load time such as
How, all obtain preferable linear relationship between the output of weighing sensor and its institute are loaded.In the range of specified carrying,
When being loaded with known force, the linear compensation factors along " desired value " curve are calculated by the reality output amount of sensor,
So as to reach desired result.Penalty coefficient used in digital compensation algorithm is the reality output amount with sensor to calculate
's.Digital compensation is under the conditions of actual loaded, the output of weighing sensor to be corrected to realize.
Lag compensation：
Most of sensors can show referred to as delayed attribute.When imposed load unloads load successively again step by step,
Phenomenon that is delayed or being sometimes referred to as " interior friction " occurs in the output of sensor.In ideal conditions, identical load is being unloaded
Reading when should be with corresponding loading during load is identical.But in fact can occur difference, this species diversity is just referred to as delayed.
Delayed is typically positive number, but also has some negative delayed phenomenons to occur.By delayed generation in resistance strain type sensor
Influence can be quite big, often the overall accuracy of limiting device.The generation of hysteresis mostlys come from the material of sensor
Characteristic and geometry.All materials with reaction force, whether metal or glass/ceramic all show different journeys
That spends is delayed.The strain ga(u)ge of high polymer material substrate also show it is delayed, and in the overall hysteresis error of sensor
It account for significant proportion.Lag compensation algorithm makes the output of weighing sensor closer to preferable straight line.In digital compensation algorithm
Used lag compensation coefficient is to apply known force to sensor in the range of specified carrying, by sensor reality output
A series of gravimetric values calculated.The algorithm corrects the output of weighing sensor according to actual loaded amount, and
Whether it is more than or less than previous loading capacity in view of current loading capacity.When loading and unloading are completed in same step
When, delayed makeover process can be comparatively simple.
Sensitivity temperature is compensated：
Temperature is most significant external influence factors.The critical piece of weighing sensor（Elastomer and strain ga(u)ge）All
Manufactured by metal material.With the change of temperature, the signal output that the expanding with heat and contract with cold of metal can cause weighing sensor
Change.Under controlled conditions, the influence of temperature can be measured.Because temperature effect is constant and repeatable
, therefore can compensate.Temperature compensation coefficient is obtained, it is necessary to test weighing sensor in whole temperature range and remember
Data are recorded, the dependent deviation produced by temperature are adjusted, to obtain expected result.Penalty coefficient is stored in weighing sensor forever
In long memory.
Zero temperature compensation：
Offset output is the sensor output surveyed under zero load.The temperature-compensating of offset output is by certain algorithm
Come what is realized, the algorithm makes sensor produce identical offset output at different temperatures.Zero compensation is by whole work temperature
The zero load surveyed in the range of degree exports reading to determine.Penalty coefficient used in digital compensation algorithm is read with these
Count to calculate.The algorithm is the actual temperature according to weighing sensor, exports what is be corrected to it.
Creep compensation：
Creep be sensor in the case where stand under load is constant, it exports the change that occurs with the time（Increase or decrease）.
Under loaded condition, the hardware of continuity weighing sensor over time can produce lasting deformation.This lasting change
Shape can cause additional strain in sensor.Under controlled conditions, the influence of time can be measured after loading for the deformation
Out.Because this influence is constant and repeatable, therefore it can compensate.Creep compensation coefficient is given at one
Time in, identical power is applied to weighing sensor and determined.Creep compensation coefficient used in digital compensation algorithm
By being calculated to these weight readings.The algorithm is weighed according to actual loaded amount, the time of loading to correct
The output of sensor.
The amendment of uneven loading error：
It can cause load due to error, the deviation of patch location and the strain ga(u)ge itself that machining is produced
The diverse location for being added to weighing platform is that sensor output produces error.This error applies phase successively by the position different to weighing platform
Load together and the output for recording each electric bridge of diverse location, calculating processing is carried out by the output data to different electric bridges, real
Amendment on a present single-point type sensor without physical method to uneven loading error.This repairing using digitlization uneven loading error
It is exactly one step completed after electronic scale assembling is finished, so as to save substantial amounts of manpower, and greatly improve production efficiency；It is special
The other elastomer to using slice structure greatly reduces the difficulty of processing of elastomer, greatly reduces manufacturing cost.
Intelligently amendment weighing sensor has advantages below to the multichannel digital uneven loading error of above-described embodiment：
1st, realize and repaiied on a single-point type weighing sensor without frustrating, one-time detection can be just completed to uneven loading error
Digital intelligent amendment, and amendment precision greatly improve, in that context it may be convenient to meet requirement of 2 grades of scales to uneven loading error.
2nd, by being digitized processing to the voltage signal that Wheatstone bridge is exported, electricity is compensated without temperature control
Resistance, temperature control linearisation adjustment and compensation rate semifixed resistor, temperature zero compensation resistance, offset output compensation resistance, i.e.,
Temperature control, temperature zero point, the compensation of offset output can be completed, and compensation precision improves an order of magnitude, can be light
Meet requirement of 2 grades of scales to temperature error.
3rd, by being digitized processing to the voltage signal that Wheatstone bridge is exported, realize and resistance-strain type is weighed
The linear of sensor output, creep, delayed digitlization amendment, improve the accuracy class of resistance strain weighing transducer.
4th, it is that product up-gradation and fault diagnosis are provided conveniently using the online firmware upgrade of sensor.
5th, using instruction type communications protocol, data communication frequency is reduced, the power consumption of sensor is substantially reduced.
Claims (7)
1. multichannel digital uneven loading error intelligently corrects weighing sensor, it is characterised in that including what is be made up of aluminum alloy materials
Elastomer（1）, elastomer（1）By middle crossbeam（2）And the left fixed part at two ends（3）, right fixed part（4）Constitute, two solid
Determine portion and crossbeam（2）It is structure as a whole, left fixed part（3）On be formed with mounting hole（5）, right fixed part（4）Lower surface be provided with
Mounting hole（5）, right fixed part（4）Upper surface be provided be used for place wiring board（6）Groove（12）, crossbeam（2）Inside set
Have multiple through crossbeam（2）Through hole（7）, crossbeam（2）Upper and lower surface correspondence through hole（7）Position be strain regions, crossbeam
（2）Upper and lower surface be respectively equipped with two groups of resistance-strain devices, every group of resistance-strain device is by four strain ga(u)ge groups
Into four groups of resistance-strain devices pass through wire and wiring board（6）Mutually weld, wiring board（6）With outernal display unit（13）Communication
Connection, crossbeam（2）Upper and lower two surfaces and groove（12）Outer surface on be coated with preservative treatment layer；
The through hole（7）Cross section be in petal-shaped, crossbeam（2）Upper and lower surface correspondence petal-shaped through hole（7）Position be
Strain regions, petal-shaped through hole（7）Side be by four diameter identical semicircles I（7-1）, semicircle II（7-2）, semicircle III（7-3）、
Semicircle IV（7-4）Composition, crossbeam（2）Upper and lower surface be respectively equipped with two groups of resistance-strain devices, two groups of resistance of upper surface should
Become the installation site and two petal-shaped through holes of device（7）Semicircle I（7-1）, semicircle II（7-2）Position it is corresponding, following table
The installation site of two groups of resistance-strain devices in face and two petal-shaped through holes（7）Semicircle III（7-3）, semicircle IV（7-4）'s
Position is corresponding；
The resistance-strain device is by four strain ga(u)ges arranged in matts shape（8）Constitute, strain ga(u)ge（8）According to
It is secondary to be connected by wire, form Wheatstone bridge；
The wiring board（6）It is provided with single-chip microcomputer（9）And power circuit, single-chip microcomputer（9）It is connected with temperature measuring circuit（15）,
Single-chip microcomputer（9）Input be also associated with four A/D converters（10）, A/D converter（10）Input and resistance-strain fill
Put and be connected by wire, A/D converter（10）Filter circuit is additionally provided between resistance-strain device（11）.
2. intelligently correct weighing sensor according to the multichannel digital uneven loading error described in claim 1, it is characterised in that institute
State through hole（7）Cross section is rounded or square or ellipse, crossbeam（2）Upper and lower surface correspondence through hole（7）Position
As strain regions, crossbeam（2）Upper and lower surface be respectively equipped with two groups of resistance-strain devices, the installation site of resistance-strain device
The adjacent through hole with two（7）Position it is corresponding.
3. intelligently correct weighing sensor according to the multichannel digital uneven loading error described in claim 1, it is characterised in that institute
State left fixed part（3）It is connected with the scale pan, right fixed part（4）It is connected with base.
4. intelligently correct weighing sensor according to the multichannel digital uneven loading error described in claim 1, it is characterised in that institute
State crossbeam（2）Width be 30 millimeters, strain ga(u)ge（8）It is affixed on crossbeam（2）Away from neutral line on upper surface or lower surface
5.36mm place.
5. intelligently correct weighing sensor according to the multichannel digital uneven loading error described in claim 1, it is characterised in that institute
State right fixed part（4）On offer for the through hole through wire, groove（12）A surface side wall be provided with and be used for through cable
Line portals.
6. intelligently correct weighing sensor according to the multichannel digital uneven loading error described in claim 1, it is characterised in that institute
State wiring board（6）It is connected by cable with outernal display unit communication.
7. multichannel digital uneven loading error intelligently corrects the Weighing method of weighing sensor, it is characterised in that including following step
Suddenly：
1）, load is applied to elastomer（1）On, make elastomer（1）Upper and lower four strain regions produce with magnitude of load into
The elasticity of flexure deformation of ratio；
2）, by applying the Wheatstone bridge of driving voltage by the strain ga(u)ge in four groups of resistance-strain devices（8）Resistance
Change is converted into voltage signal output；
3）, four groups of Wheatstone bridge outputs voltage signal pass through filter circuit（11）Filter out and A/D converter is conveyed to after noise
（10）, A/D converter（10）Data signal is sent to single-chip microcomputer（9）, pass through temperature measuring circuit（15）It can monitor in real time
Elastomer（1）Temperature, and temperature information is sent to single-chip microcomputer（9）；
4）, single-chip microcomputer（9）To step 3）Received multichannel measurement data are handled, and according to the temperature information collected
It is digitized compensation calculation；
5）, pass through single-chip microcomputer（9）Data are sent aobvious to outside by upper set TXD and RXD asynchronous communication interfaces by cable
Show unit（13）.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410722524.1A CN104374453B (en) | 2014-12-03 | 2014-12-03 | Multichannel digital intelligent correction weighing sensor for offset load error and weighing method thereof |
| PCT/CN2015/071801 WO2016086528A1 (en) | 2014-12-03 | 2015-01-29 | Multichannel digitalized intelligent correcting and weighing sensor for unbalanced load error and weighing method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410722524.1A CN104374453B (en) | 2014-12-03 | 2014-12-03 | Multichannel digital intelligent correction weighing sensor for offset load error and weighing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104374453A CN104374453A (en) | 2015-02-25 |
| CN104374453B true CN104374453B (en) | 2017-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410722524.1A Active CN104374453B (en) | 2014-12-03 | 2014-12-03 | Multichannel digital intelligent correction weighing sensor for offset load error and weighing method thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104374453B (en) |
| WO (1) | WO2016086528A1 (en) |
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| CN106644197A (en) * | 2016-10-28 | 2017-05-10 | 莆田市力天量控有限公司 | Rolling force sensor of Chinese character wang-shaped structure |
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| WO2016086528A1 (en) | 2016-06-09 |
| CN104374453A (en) | 2015-02-25 |
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