CN100570290C - Determine the method for correction factor of belt balance real object simulating detection device - Google Patents
Determine the method for correction factor of belt balance real object simulating detection device Download PDFInfo
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- CN100570290C CN100570290C CNB2008101152218A CN200810115221A CN100570290C CN 100570290 C CN100570290 C CN 100570290C CN B2008101152218 A CNB2008101152218 A CN B2008101152218A CN 200810115221 A CN200810115221 A CN 200810115221A CN 100570290 C CN100570290 C CN 100570290C
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Abstract
The invention discloses a kind of method and substitute the method for determining correction factor of belt balance real object simulating detection device with material detection device in kind with the belt tension compensation.This method is: by test and calculating, and definite respectively running resistance that band conveyor is produced by circulating chain code and material, thereby the difference of definite belt tension and tensioning weight weight; Is that the weight of G is strained the length of measurement belt and the height of weight downward vertically at the band conveyor counterweighted take-up place of the belt conveyer scale that detects with circulating chain code with quality; Increase forward and backward displacement according to the weight quality, belt conveyer scale is carried out the cumulative amount mean value W of repeated detection with circulating chain code
Chain code G, W
Chain code (G+ Δ G)Press C
Speed=1/ (1-2 (h
1-h
2)/L) calculates speed correction factor, C
Speed, again according to C=1+ (C
SpeedW
Chain code (G+ Δ G)-W
Chain code G)/(C
SpeedW
Chain code (G+ Δ G)) calculate circulating chain code correction factor C.
Description
Technical field
The present invention relates to the bearing calibration of a kind of industry measurement utensil accuracy.Be a kind of a kind of new definite method of correction factor of the belted electronic balance object simulating detection device that belted electronic balance is detected specifically.
Background technology
At present, be widely used in the belt conveyer scale object simulating detection device that industry spot detects belted electronic balance, the main part of its tool feature, that is: the standardized component by the upper level transmission of quantity value is a circulating chain code, usually can claim directly that the belt conveyer scale object simulating detection device is a circulating chain code, because of its principle science, be skillfully constructed, advantage such as rational in infrastructure, cheap, easy to operate and good reproducibility, tentatively shown its vitality in belted electronic balance detects.After revising through material test in kind, the accuracy in detection of circulating chain code can guarantee 0.1%.Therefore, over nearly 10 years, circulating chain code is particularly popularized in the use of fuel-burning power plant day by day in each industry spot.
But will be to the belt conveyer scale object simulating detection device---circulating chain code carries out material test in kind to be revised, and must be equipped with material detection device in kind at the scene that belt conveyer scale and circulating chain code are installed, and this apparatus cost is huge, and the effort of taking a lot of work when detecting.Therefore the correction factor of determining circulating chain code becomes the bottleneck that influences the circulating chain code technical development, and the development prospect of the circulating chain code that is full of vitality is restricted.
Summary of the invention
The present invention has proposed a kind of scene at the problems referred to above not need to be equipped with material detection device in kind is determined the object simulating detection device correction factor with regard to the energy science method---the alternative method of determining the object simulating detection device correction factor with material detection device in kind of a kind of method with the belt tension compensation.
This method is based on following viewpoint: the result that circulating chain code is demarcated belt conveyer scale when unmodified and the main cause that the result that material in kind is demarcated there are differences are that the suffered resistance of band conveyor is different under the two states, cause the tension force of belt conveyer scale installation place belt under two states to vary in size, thereby the influence of belt balance weighing power has been produced difference.
The main points of this method are: with the mathematical model that test figure and theoretical derivation combine and draw, and the difference of belt tension when belt conveyer scale installation place belt tension passes through this place with material in kind under corresponding discharge when determining circulating chain code work; With the method people of the machinery belt tension of belt conveyer scale installation place for a change, circulating chain code is worked according to this difference under the belt tension after the compensation, can simulate material in kind under the corresponding discharge by the time to the calibration result of belt conveyer scale; Change preceding calibration result with this result and belt tension and contrast, just can calculate the correction factor of this scene circulating chain code.On the band conveyor that adopts counterweighted take-up, can be used on the belt tension that the method that increases impost on the counterweighted take-up changes the belt conveyer scale installation place, to realize tension compensating.
Also the corrected Calculation formula has been proposed the factors such as change that cause the belt conveyer scale velocity measurement owing to tension compensating in this method.
The present invention adopts following technical scheme: when (1) is G in the weight quality of band conveyor counterweighted take-up, the circulating chain code of operation belt conveyer scale object simulating detection device on band conveyor, when measuring band conveyor and under various angle states, drive circulating chain code and normally move, by the running resistance F of circulating chain code to the band conveyor generation by the method for test
Chain codeThereby, calculate from the belt conveyer scale center running resistance f that by circulating chain code band conveyor is produced backward
Chain code:
f
Chain code=0.5F
Chain code
The size of the quality G of weight should guarantee to make belt by drum driven and non-slip to the tension force that the belt of band conveyor produces, and guarantees that band conveyor runs well;
(2) when the weight quality is G, determine the running resistance f that material produces band conveyor by Calculation Method
Material:
f
Material=f
Main+ f
Vertically+ f
Additional
In the formula: f
Main: move the resistance that causes for making material horizontal direction from feeding mouth to the belt conveyer scale center;
f
Vertically: for being that the inclination angle of band conveyor makes material improve the resistance that potential energy brings from charging aperture to the belt conveyer scale center;
f
Additional: be additional drag, comprise from the feeding mouth to the belt conveyer scale between about deflector chute, swabbing pig, carrying roller, belt bending resistance and roller bearings resistance through cylinder;
(3) according to F
Chain codeAnd f
MaterialThe difference DELTA T of belt tension when belt conveyer scale installation place belt tension passes through this place with material in kind under corresponding discharge when calculating circulating chain code work:
Δ T=f
Material-f
Chain code
(4) determine the difference DELTA G value of tensioning weight weight according to Δ T value:
ΔG＝2ΔT/g；
(5) on the band conveyor counterweighted take-up of the belted electronic balance that detects with circulating chain code with quality be the heavy weight of G downward vertically with tension on belt, the total length L of measurement belt under this state;
(6) when the weight quality is G, with circulating chain code belt conveyer scale object simulating detection device belt conveyer scale is carried out repeated detection, be t each detection time
Inspection, draw corresponding time t
InspectionUnder the mean value W of cumulative weight
Chain code G
(7) then the weight quality is increased Δ G, when the weight quality is G+ Δ G, with circulating chain code belt conveyer scale is carried out repeated detection again, be t each detection time
Inspection, draw corresponding time t
InspectionUnder the mean value W of cumulative amount
Chain code (G+ Δ G)
(8) after the weight quality increases Δ G, measure the consequent height change h of counterweighted take-up, calculate speed correction factor C
Speed:
C
Speed=1/ (1-2 Δ h/L)
(9) calculate circulating chain code correction factor of belt balance real object simulating detection device C according to following formula:
The present invention has realized that definite belt conveyer scale object simulating detection device---method of circulating chain code correction factor---uses " tension compensating " to determine the correction factor of belt conveyer scale object simulating detection device under non-material test condition in kind, overcome the power of the weighing error that causes owing to " belt effect ", thereby make circulating chain code can under the condition of breaking away from material caliberating device in kind, just can reach the necessary accuracy of measuring.
Description of drawings
Fig. 1 is the belt tension signal under static state of belted electronic balance band conveyor.
Fig. 2 is for transporting belt tension synoptic diagram under the material driving condition;
Fig. 3 detects driving condition belt tension synoptic diagram for circulating chain code;
Fig. 4 circulating chain code running resistance synoptic diagram.
Fig. 5 is the influence of Δ G to resistance.
Fig. 6 is the influence of Δ G to testing the speed.
Fig. 7 is the synoptic diagram of car formula band conveyor counterweighted take-up.
Embodiment
Below in conjunction with the drawings and specific embodiments principle of the present invention and method are described further, to help understanding content of the present invention.
1. about the basic concepts of belt tension
1.1 belt tension condition under the band conveyor normal operating condition and weight quality
Belt tension changes on whole length, and influence factor is a lot, and for guaranteeing the normal operation of band conveyor, the tension force of belt must satisfy two conditions:
1.1.1 band conveyor must have ability operate as normal under the prerequisite of certain belt tension, have only belt tension to acquire a certain degree, could produce enough friction force (all the force of periphery on the cylinder is delivered on the belt by friction) between head roll and the belt and make the belt operation non-slip.And non-slip will accomplish the band conveyor operate as normal time, need belt to keep minimum tension, it then is the means of guaranteeing that the belt minimum tension is the most frequently used that counterweighted take-up is set on return belt.
1.1.2 have only belt tension to acquire a certain degree (enough big), the sag of belt between two groups of carrying rollers is reduced to carries function picking-up material normally to move.
1.2 determining of band conveyor belt tension state
As shown in Figure 1, when the band conveyor that belt conveyer scale is used remained static, the tension force everywhere of belt 100 (dotted line among the figure) was basic identical, and the tension force size depends on the quality G of weight 200;
The belt tension that weight quality G produces is greater than making the non-slip critical weight quality of belt, so that band conveyor runs well.
As shown in Figure 2, the band conveyor that belt conveyer scale is used is under the driving condition, though the weight quality still is G, the tension force of belt 100 (dotted line among the figure) distributes obviously different when static everywhere.Among the figure:
Point 1 begins to enter the position of cylinder cornerite, belt tension T herein for belt
1Maximum;
Point 2 is the position at belt balance weighing carrying roller center;
Point 4 is the tensioning system position, herein belt tension T
4Should be half of hanger (weight and hanger) quality gravity;
Point 0 is for beginning to leave the position of cylinder cornerite, belt tension T herein
0Minimum.
Fu is the force of periphery that head roll is passed to belt, Fu=T as can be known
1-T
0, Fu has overcome various resistances belt is normally moved just.
Belt enters, leaves the tension force T at head roll cornerite place during driving
1And T
0Between following relation arranged:
In the formula: μ is the friction factor between head roll and belt;
φ is the cornerite (rad) of belt on head roll.
2. the belt tension difference DELTA T at material operation in kind and circulating chain code device operation belt conveyer scale place
The belt tension difference DELTA T at circulating chain code device operation belt conveyer scale place should be from the belt conveyer scale center backward under material operation in kind and the same rated flow, the belt running resistance f that material causes
MaterialThe running resistance f that causes with circulating chain code
Chain codePoor.That is:
Δ T=f
Material-f
Chain code
1) f
Material
In the belt conveyer scale center:
Material=f
Main+ f
Vertically+ f
Additional
In the formula: f
Main: move the resistance that causes for making material horizontal direction from feeding mouth to the belt conveyer scale center.
f
Vertically: for being that the inclination angle of band conveyor makes material improve the resistance that potential energy brings from charging aperture to the belt conveyer scale center
f
Additional: be additional drag, comprise from the feeding mouth to the belt conveyer scale between about deflector chute, swabbing pig, special carrying roller, belt through the bending resistance of cylinder and roller bearings resistance or the like.Usually, deflector chute is only arranged around here.
2) f
Chain code
If F
Chain codeBe when band conveyor drive circulating chain code normally moves, the running resistance of circulating chain code; Be circulating chain code from the belt conveyer scale center running resistance that causes of circulating chain code backward.
The part that drops on the belt during circulating chain code operation should be a symmetry with scale body center line.Circulating chain code is to the resistance F of belt operation
Chain codeBe by each code block that drops on the belt friction force that strap surface produces to be embodied, friction force is that stepless action is in belt.So
f
Chain code=0.5F
Chain code
The analysis of the running resistance of circulating chain code: when the circulating chain code let-down in band conveyor and under belt drives during normal operation, the belt tension of the belt section part in chain code the place ahead has Δ T in the time of will be than band conveyor no-load running
Chain codeIncrement, this increment equals the running resistance F of circulating chain code
Chain codeA certain instantaneous in circulating chain code operation is divided into two parts with the chain code total length: as shown in Figure 4: L
1For chain code drops on that part of on the band conveyor; L
2For removing L
1Outer remainder.Corresponding, the running resistance of circulating chain code also is divided into corresponding two parts R
1And R
2:
F
Chain code=R
1+ R
2
Wherein: R
1Be L
1The resistance that the part chain code causes, its resistance part are owing to this part chain code weight is pressed in the belt roller running resistance increment that causes on the belt; Another part is an additional drag of sinking to causing the belt operation that the operating wave motion of this part chain code causes owing to belt surface.
R
2Be L
2The part chain code is in operation synthesizing of various resistances, mainly comprise: this part chain code weight is pressed in the frictional resistance that causes on each carrying roller of chain code bracing or strutting arrangement, chain code in service between each carrying roller wave motion and the additional drag of the operation that causes and at head, tail roller and fold into belt or leave the belt place chain code kinetic additional drag etc. that alters course.
The running resistance size of circulating chain code is all relevant with the situation of the situation of idler for belt conveyer situation, chain code (particularly chain code bearing pin) and each roller of chain code device.Chain code is a loop body, and chain code is in operation, and potential energy does not change as a whole; But facts have proved that the running resistance of circulating chain code is relevant with the band conveyor inclination angle, when the inclination angle was strengthened, running resistance reduced thereupon.Its reason mainly contains two: one, and when the inclination angle was strengthened, chain code gravity reduced for the normal pressure component of belt and each carrying roller; Its two, strengthening along the component of chain code length direction of chain code gravity strengthen the stretching trend of chain code, reduced the operating wave motion of chain code.
The running resistance of circulating chain code can be determined with the method for test.
F has been arranged
MaterialAnd f
Chain code, can obtain material operation in kind and the circulating chain code device operation belt conveyer scale belt tension difference DELTA T of place.
To the most tangible factor of material running resistance influence is the belt inclination angle, f
Chain codeWith f
MainAnd f
AdditionalSubstantially on an order of magnitude.At the scene of horizontal belt, modified value is very little.
2. determine the principle of correction factor of belt balance real object simulating detection device with " tension compensating " method
The reason that causes the belt conveyer scale weighing error is very various, but can analyze from belt conveyer scale weighing error source substantially.Should find out its relevant factor, slightly remove its irrelevant factor.At this, the factor of slightly removing has following several:
A. slightly removing and the belt conveyer scale object simulating detection device---circulating chain code detects or error component identical with material device detection method influence in kind or that difference is little.For example: the error of LOAD CELLS, speed pickup, the instrument signal process errors, the environmental impact error that temperature, humidity, wind-force, vibrations and electromagnetic interference (EMI) etc. cause, or the like.The range rate error influence also is essentially identical at this, because when detecting with two kinds of methods respectively, the cylinder that tests the speed is contained in same position, and be positioned at return belt, herein belt tension not have change substantially when method changed, therefore the strain of belt herein (relative elongation) is identical, so the situation of testing the speed should be a basically identical, two kinds of detection method results produce difference and have nothing to do with range rate error.
B. slightly remove the stochastic error factor.For example the sideslip of material, belt causes the error that the traversing resistance of belt causes, material impacts the error that causes to carrying roller, or the like.Stochastic error may be brought calibration error to pick-up unit, but it can't compensate with correction factor.Because the circulating chain code quality is even, operate steadily, so when detecting with the circulating chain code device, the calibration error of its enchancement factor generation is less than material device in kind.
Therefore, determine that with " tension compensating " method the principle of correction factor of belt balance real object simulating detection device is based on:
3.1 to same belt conveyer scale, under the condition of same rated flow, the difference of material in kind and belt conveyer scale object simulating detection device testing result is by different the causing of the belt tension T of belt conveyer scale place under two kinds of methods;
3.2 the difference DELTA T of tension force T can determine with the method for non-material object under these two kinds of methods;
3.3 we can manage the belt tension at belt conveyer scale place is changed, difference DELTA T is fallen in compensation, and then we just can simulate material in kind stressed basal conditions of belt conveyer scale weighing platform when moving under the condition with the circulating chain code operation.Replace material in kind to detect thus, and then obtain correction factor at the belt conveyer scale object simulating detection device of this belt conveyer scale.
Therefore, form the tension compensating method to be that the heavy hammer of G is strained downward vertically and set up tension force with quality at the counterweighted take-up place of the belt of belt conveyer scale--tension weight method of addition
For the band conveyor that has vertical tension Weight type take-up device, if the weight of weight (comprising weight box and the changed course cylinder that is attached thereto) is G, then no matter band conveyor is static or operation, with reference to shown in Figure 2, the belt tension at tension points 4 places is 0.5Gg (g is an acceleration of gravity) under this changed course cylinder.The definite value point that a tension force has been arranged on band conveyor like this.Equaling 0.5Gg for the belt tension size of a certain position on the operating band conveyor adds from this point to band conveyor posterior direction (anti-traffic direction) until various running resistance sums of tension points under the take-up device changed course cylinder.
See Fig. 1 and Fig. 2, the weight G of the tension weight of belt has not only determined the static tension level of belt down, and has determined belt under operation, everywhere the base value of tension force.As shown in Figure 3, when G has increment Delta G, the tension level of each point will improve thereupon.If when G is increased to G+ Δ G, the tension force that the tension force of (point 2 of Fig. 3) is just caing be compared to when not adding Δ G at the belt conveyer scale center during circulating chain code operation has increased Δ T, promptly when not adding Δ G under the same rated flow tension force during material operation in kind identical, the stressed basal conditions of weighing platform when we just may simulate material in kind operation under the condition of circulating chain code substitutes material in kind with this situation and detects the modified value of trying to achieve the belt conveyer scale object simulating detection device.
The calculating of Δ G value
When band conveyor was static, after the weight weight G of counterweighted take-up had increment Delta G, belt tension force everywhere should have the increment of 0.5 Δ Gg; After the band conveyor operation, this increment will keep.If there is not other influence, then can make:
0.5 Δ Gg=Δ T is promptly:
ΔG＝2ΔT/g
In the formula, g is an acceleration of gravity;
Promptly on weight, add 2 Δ T/g, can make tension force increase Δ T.
But, after counterweighted take-up weight G has increment Delta G, can strengthen to weight changed course cylinder position belt running resistance backward from the belt conveyer scale position, this can cause the corresponding increase of belt conveyer scale center tension force.Δ G can cause that resistance strengthens by following two reasons:
Bending resistance when a. belt is through each changed course cylinder increases with the increase of belt tension;
B. the bearing resistance of cylinder of respectively altering course increases with the increase of belt to its positive pressure.
1.. the influence that the bending resistance of each cylinder that alters course increases
In general, relevant therewith cylinder has 180 ° of changed courses of weight suspension place cylinder, 90 ° of alter course cylinder and band conveyor stern rolls etc.Belt the cylinder i of process have belt tension that increment Delta T is arranged
iThe time, the formula of the average increment Δ F of bending resistance when belt passes through cylinder.
To various canvas aprons:
ΔF＝0.09ΔT
i·d/D
To the wire-core conveying belt:
ΔF＝0.12ΔT
i·d/D
In the formula: d is a conveying belt thickness, m
D is a diameter of cylinder, m
Referring to Fig. 5, at cylinder 10 places, owing to had increment Delta G, cylinder both sides to have mean tension increment (0.5 Δ Gg), the substitution following formula can draw Δ F
1The tension force of diagram b side will have Δ F than a side
1Increment, promptly have:
ΔT
b＝ΔT
a+ΔF
1
In like manner, have at cylinder 20,30 places:
ΔT
c＝ΔT
b+ΔF
2，ΔT
d＝ΔT
c+ΔF
3
Then the tension increment of belt conveyer scale center should be:
Δ T=Δ T
dTo then have with following formula and substitution:
Δ T=Δ T
a+ Δ F
1+ Δ F
2+ Δ F
3Again will
Δ T
a+ Δ T
b=Δ Gg substitution then has:
ΔT＝0.5ΔG·g+0.5ΔF
1+ΔF
2+ΔF
3
Through arrangement, then can derive the calculating formula of weight increment:
ΔG＝[2ΔT-ΔF
1-2(ΔF
2+ΔF
3)]/g
Herein, Δ T is material operation in kind and belt conveyer scale object simulating detection device operation belt conveyer scale place belt tension difference
G is an acceleration of gravity, m/s
2The unit of Δ G is kg; Each tension force, resistance unit are N.
If these interval other cylinders in addition, calculate same the adding.
2.. the influence that the bearing resistance of each cylinder that alters course increases
When belt tension has increment Delta T, the formula of the increment of roller bearings resistance when belt passes through cylinder:
ΔF
t＝0.01[sin(α/2)]ΔT
i·d/D
In the formula: Δ F
tAfter increasing test weight Δ G, roller bearings resistance added value.
D is the diameter of axle in the bearing, m
D is a diameter of cylinder, m
D is two tension direction angles, °
To 180 ° of changed course cylinders, Δ F
t=0.01 Δ Td/D
To 90 ° of changed course cylinders, Δ F
t=0.007 Δ Td/D
This influence is incorporated into, is then had:
ΔG＝[2ΔT-ΔF
1-ΔF
t1-2(ΔF
2+ΔF
t2+ΔF
3+ΔF
t3)]/g
As seen from the above equation, increase the weight of Δ G when weight after, the tension increment at corresponding belt conveyer scale place is greater than 0.5 Δ Gg, reason is that the cylinder that respectively alters course has increased resistance, drive unit will export bigger moment so that band conveyor keeps normal operation.
For finding out the value size of this influence roughly, at the default thick canvas apron of 0.016m, 180 ° of changed course cylinders (diameter of axle 0.16m in the bearing) of two Φ 650, calculate under the condition of 90 ° of changed course cylinders (diameter of axle 0.14m in the bearing) of a Φ 500, the increment of its running resistance is about 2% of Tension Difference Δ T, so can ignore.
As mentioned above, if weight increased with the corresponding weight Δ of the Δ T of belt conveyer scale place G after, the stressed basal conditions of weighing platform when the available cycles chain code simulates material in kind operation.And then, can try to achieve the correction factor C of belt conveyer scale object simulating detection device.Its process of trying to achieve is as follows:
1. before and after adding Δ G belt conveyer scale is carried out control test
The process that the belt conveyer scale object simulating detection device is revised in the material detection in kind of similar usefulness is carried out the comparison under the two states.At first belt conveyer scale scale body and instrument should be adjusted to optimum condition.The test coefficient of belt conveyer scale object simulating detection device instrument is reduced to 1.
When weight weight is G, with circulating chain code belt conveyer scale is carried out repeated detection (as: frequency n=5), draw corresponding time t
InspectionUnder the mean value W of cumulative amount
Chain code GAfter weight weight increased to G+ Δ G, repeat above the detection, draw corresponding time t
InspectionUnder the mean value W of cumulative amount
Chain code (G+ Δ G)
2. belt speed is measured correction factor C
Speed
Increase the weight of Δ G when weight after, the stressed basal conditions of weighing platform when circulating chain code simulates material operation in kind.Belt conveyer scale metering material cumulative amount is to draw by the integrating to unit length weight of material and belt speed:
Weight weight has caused the increase of the cylinder place belt tension that tests the speed after increasing, and makes the belt speed measurement that variation arranged.Thereby make and add the material cumulative amount measured behind the Δ G and had different with the flow material cumulative amount that detects in kind down.
As shown in Figure 6, the cylinder that tests the speed is contained in return belt k place, with the linear velocity rotation of belt herein, makes the real-time rate signal of tachogenerator output, insert after the belt conveyer scale instrument weight signal integrating with synchronization and be belt with the material cumulative amount.Belt conveyor is the elastic body with certain elastic modulus, will extend under certain force of strain.By the mechanics of materials as can be known:
ε＝T/(E·A)
In the formula: ε is strain, i.e. the elongation of unit length,
T is a tension force herein, N
E is the elastic modulus of belt, N/cm
2
A is the cross-sectional area of belt, cm
2
From following formula as can be known, when tension force T changed, strain stress just changed.The variation of strain directly has influence on the measurement of speed.
Cylinder is contained on the return belt because test the speed, and when tensioning weight weight G one timing, if the belt physical property is even, the belt linear velocity constant, no matter is the belt zero load then, or the chain code operation, or material in kind operation, and the tension force that k is ordered should be constant substantially, and establishing it at this is T
K1, corresponding dependent variable is ε
K1But increase the weight of Δ G when the tensioning weight after, the tension force that k is ordered can be increased to T thereupon
K2From following formula as can be known, when tension force increased, strain increased thereupon, and establishing at this moment, dependent variable is ε
K2
Δε
k＝ε
k2-ε
k1
The elongation of belt increases, and has slowed down the linear velocity at k point place.The relative changing value that its speed reduces is:
δV＝Δε
k＝(T
k2-T
k1)/(E·A)
From then on as can be known, increase the weight of Δ G when the tensioning weight after, the rate signal of tachogenerator output will than with same flow under material running status in kind (at this moment, the tensioning weight need not add Δ G) little δ V (relative value).
Method with the scene examination is surveyed directly draws the speed correction factor.Method is as follows:
Measure the length L of band conveyor belt;
Measure the tensioning weight under the band conveyor quiescent conditions, increase the slippage Δ h of the forward and backward weight box height of test weight Δ G weight;
Calculate δ V=Δ ε
k=2 Δ h/L;
Calculate C
Speed=1/ (1-δ V), C
SpeedIt is exactly the speed correction factor.
3. ask circulating chain code device correction factor C
Circulating chain code device correction factor C can express with following formula:
In the formula: W
G in kindFor under weight weight G, with the due cumulative amount of material in kind under the same flow of circulating chain code, the same time t.By above narration, it can be by W
G+ Δ GAfter the speed correction, obtain:
W
G in kind=C
SpeedW
G+ Δ G
Substitution gets:
The C value is exactly that we use the tension compensating method, the correction factor of the belt conveyer scale object simulating detection device that draws under the situation that no material in kind detects.
4, specifically determine method
Concrete definite method of circulating chain code correction factor, this method is:
(1) when the weight quality is G, on band conveyor, moves circulating chain code, when measuring band conveyor and under various angle states, drives circulating chain code and normally move, by the running resistance F of circulating chain code to the band conveyor generation by the method for test
Chain codeThereby, calculate from the belt conveyer scale center running resistance f that by circulating chain code band conveyor is produced backward
Chain code:
f
Chain code=0.5F
Chain code
Determine the torque curve that the test method of running resistance can be by the current value of the drum drive motor of band conveyor under the different conditions be exported during with the different electric current of motor, calculate.
(2) when the weight quality is G, determine the running resistance f that material produces band conveyor by Calculation Method
Material:
f
Material=f
Main+ f
Vertically+ f
Additional
(3) according to F
Chain codeAnd f
MaterialThe difference DELTA T of belt tension when belt conveyer scale installation place belt tension passes through this place with material in kind under corresponding discharge when calculating circulating chain code work:
Δ T=f
Material-f
Chain code
(4) determine the difference DELTA G value of tensioning weight weight according to Δ T value:
ΔG＝2ΔT/g；
(5) on the band conveyor counterweighted take-up of the belted electronic balance that detects with circulating chain code with quality be the heavy weight of G downward vertically with tension on belt, the total length L of measurement belt and the height h of weight under this state
1
(6) when the weight quality is G, with circulating chain code belt conveyer scale object simulating detection device belt conveyer scale is carried out repeated detection, be t each detection time
Inspection, draw corresponding time t
InspectionUnder the mean value W of cumulative weight
Chain code G
(7) then the weight quality is increased Δ G, measure the height h of weight
2, and when the weight quality is G+ Δ G, with circulating chain code belt conveyer scale is carried out repeated detection again, be t each detection time
Inspection, draw corresponding time t
InspectionUnder the mean value W of cumulative amount
Chain code (G+ Δ G)
(8) after increasing Δ G, the weight quality measures the consequent height change h of counterweighted take-up, Δ h=h
1-h
2Calculate speed correction factor C
Speed:
C
Speed=1/ (1-2 Δ h/L)
(9) calculate circulating chain code correction factor of belt balance real object simulating detection device C according to following formula:
Because the effect of counterweighted take-up is that tightening belt is to produce certain tension value, therefore promptly can be as shown in Figure 1, employing is provided with two bending rollers to belt vertically downward in the belt backward position of band conveyor, weight 200 is passed through floating drum tightening belt 100 downward vertically, constitute the vertical heavy-hammer tensioning system.Also can as shown in Figure 7 the drag-line that hangs weight 200 be pulled on the floating drum 40 of band conveyor by a fixed pulley that turns to or cylinder 50, utilize the belt of heavy-hammer tension band conveyor, form car formula counterweighted take-up.
Claims (5)
1. the method for a definite correction factor of belt balance real object simulating detection device, this method is:
(1) when the weight quality of band conveyor counterweighted take-up is G, the circulating chain code of operation belt conveyer scale object simulating detection device on band conveyor, when measuring band conveyor and under various angle states, drive circulating chain code and normally move, by the running resistance F of circulating chain code to the band conveyor generation by the method for test
Chain codeThereby, calculate from the belt conveyer scale center running resistance f that by circulating chain code band conveyor is produced backward
Chain code:
f
Chain code=0.5F
Chain code
The size of the quality G of weight should guarantee to make belt by drum driven and non-slip to the tension force that the belt of band conveyor produces, and guarantees that band conveyor runs well;
(2) when the weight quality is G, be calculated as follows out the running resistance f that material produces band conveyor
Material:
f
Material=f
Main+ f
Vertically+ f
Additional
In the formula: f
Main: move the resistance that causes for making material horizontal direction from feeding mouth to the belt conveyer scale center;
f
Vertically: for being that the inclination angle of band conveyor makes material improve the resistance that potential energy brings from charging aperture to the belt conveyer scale center;
f
Additional: be additional drag, comprise from the feeding mouth to the belt conveyer scale between about deflector chute, swabbing pig, carrying roller, belt bending resistance and roller bearings resistance through cylinder;
(3) according to F
Chain codeAnd f
MaterialThe difference DELTA T of belt tension when belt conveyer scale installation place belt tension passes through this place with material in kind under corresponding discharge when calculating circulating chain code work:
Δ T=f
Material-f
Chain code
(4) determine the difference DELTA G value of tensioning weight weight according to Δ T value:
ΔG＝2ΔT/g；
G is an acceleration of gravity in the formula;
(5) on the band conveyor counterweighted take-up of the belted electronic balance that detects with circulating chain code with quality be the heavy weight of G downward vertically with tension on belt, the total length L of measurement belt under this state;
(6) when the weight quality is G, with circulating chain code belt conveyer scale is carried out repeated detection, be t each detection time
Inspection, draw corresponding time t
InspectionUnder the mean value W of cumulative weight
Chain code G
(7) then the weight quality is increased Δ G, and when the weight quality is G+ Δ G, with circulating chain code belt conveyer scale is carried out repeated detection again, be t each detection time
Inspection, draw corresponding time t
InspectionUnder the mean value W of cumulative amount
Chain code (G+ Δ G)
(8) after the weight quality increases Δ G, measure the consequent height change value of the weight Δ h of counterweighted take-up, calculate speed correction factor C
Speed:
C
Speed=1/ (1-2 Δ h/L)
(9) calculate circulating chain code correction factor C according to following formula:
2. the method for definite correction factor of belt balance real object simulating detection device according to claim 1, it is characterized in that: described band conveyor counterweighted take-up is the vertical heavy-hammer tensioning system.
3. the method for definite correction factor of belt balance real object simulating detection device according to claim 2, it is characterized in that: described vertical heavy-hammer tensioning system is to adopt in the belt backward position of band conveyor two bending rollers to be set and to make belt vertically downward, with weight by floating drum tightening belt downward vertically.
4. the method for definite correction factor of belt balance real object simulating detection device according to claim 1, it is characterized in that: described band conveyor counterweighted take-up is a car formula counterweighted take-up.
5. the method for definite correction factor of belt balance real object simulating detection device according to claim 4, it is characterized in that: described car formula counterweighted take-up is that the drag-line that will hang weight is pulled on the floating drum of band conveyor by a fixed pulley that turns to or cylinder, utilizes the belt of heavy-hammer tension band conveyor.
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| CN103471698B (en) * | 2013-10-08 | 2015-06-10 | 莱芜钢铁集团有限公司 | Checking method for electronic belt scale |
| CN104180889A (en) * | 2014-07-23 | 2014-12-03 | 赛摩电气股份有限公司 | Linear compensation method for electronic belt scale |
| CN108398171B (en) * | 2016-03-23 | 2019-12-17 | 南京赛摩三埃工控设备有限公司 | belt scale error decomposition control method |
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| CN115014480A (en) * | 2022-08-05 | 2022-09-06 | 徐州昊诺自动化科技有限公司 | High-precision belt scale calibration system and method |
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