CN112345056B - Method for calibrating and verifying precision of decrement scale by substitute - Google Patents
Method for calibrating and verifying precision of decrement scale by substitute Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 69
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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 a method for calibrating and verifying the precision of a decrement scale by using substitutes, wherein the substitutes with the mass of about 1000Kg are divided into a large-mass series of substitutes and a small-mass series of substitutes, and the prepared series of substitutes are traced and numbered and then are stored on a special platform and a house on a production site; carrying out numerical value tracing and static calibration on the selected substitute, and carrying out single-bucket material calibration weight reduction weighing; and finally, verifying the precision of the weight-reducing scale in a production process by using a real object, comparing the net weight of the added materials detected by the trade scale with the net weight of the materials dispensed by the weight-reducing scale for a period of time, and calibrating the weight-reducing scale by using a series of substitutes at any time when an error is found to exceed 0.3 percent, thereby achieving the purpose of accurate measurement of the weight-reducing scale. The invention adopts the mode of obtaining the calibration of the substitute on site, ensures the precision of the weight-reducing scale in the using process, has small investment and easy operation, and the weight data of the trade weighing machine is used as a new substitute for calibrating the weight-reducing scale, thereby having great production guiding effect.
Description
Technical Field
The application belongs to the technical field of industrial measurement, and relates to a method for calibrating a weight-reducing scale in a real object mode, in particular to a method for calibrating and verifying the precision of the weight-reducing scale in the real object mode by using a substitute.
Background
The weight-reducing scale is originally widely applied to the light industrial range of plastic, chemical fiber and food industries. With the maturity and development of the weight-reducing scale technology after 2011, the weight-reducing scale is widely applied to the heavy industrial fields of cement, thermal power generation, steel mixing and the like. The precision of the weight-reducing scale is very important for the quality of finished products participating in uniform mixing. The cement content of the mixing plant is high, so that the shrinkage force of concrete is enhanced, and the cracks of buildings are caused. The low cement content can cause the strength of concrete to be reduced. The cement proportion must be controlled in a small range. The alkalinity stability rate of the sintering machine is directly influenced by too much or too little mixing proportion of the white ash as the sintering machine ingredient, other iron materials and anthracite. The alkalinity fluctuation of the sintering machine is 0.10, which affects the coke ratio and the yield of the blast furnace in the range of 3-3.5%, and also affects the acid-base balance of the molten iron of the blast furnace, the removal of the molten iron S and the stability of slagging. The accuracy of the weighing data of the decrement scale has great influence on the industries such as chemical industry, civil engineering, food, steel and the like.
At present, the weight-reducing scale is fixedly installed, so that the defects of speed measurement, belt deviation, abrasion and the like are eliminated, and the precision is high. The material conveying channel is closed, is suitable for various modes of adding fine particle powder materials, can meet the requirement of environmental protection, has strong practicability and can be used in a large number of fields.
The weight-reducing scale has the following problems:
most of the weight-reducing scales used on-line cannot be calibrated in real life as specified. The environment, material condensation degree, feed bin vibration intensity number of times, many factors of spiral discharge system vibration that the decrement balance used all cause the decrement balance precision to reduce, and the production process often need calibrate at any time. The quantity of standard substances in actual production is small, a plurality of large-mass standard substances are needed for calibrating one weight reduction scale, and the weight reduction scale cannot be calibrated in time due to the limitation of hoisting, carrying and calibrating series operation. The precision of the weight-reducing scale is low, the added materials have great errors with the actual requirements, and the problem of the bottom error cannot be thoroughly solved. The quality components of the raw materials participating in the blending are unstable, and the product quality cannot be basically guaranteed.
Disclosure of Invention
The invention provides a method for calibrating and verifying the precision of a weight-reducing scale by using substitutes, which compares the net weight of a matched material detected by a trade scale with the net weight of the matched material of the weight-reducing scale for a period of time, and calibrates the weight-reducing scale by using series of substitutes at any time when the error is found to exceed 0.3 percent so as to achieve the aim of accurate measurement of the weight-reducing scale.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a method for calibrating and verifying the precision of a decrement scale by a substitute comprises the following steps:
step A: selecting a substitute, namely selecting a calibrated substitute according to the field condition and the decrement scale range;
and B: cleaning the appearance of the selected substitute, determining a number, pasting an identifier and recording files;
step C: carrying out numerical value tracing on the selected substitute;
step D: carrying out static calibration on the decrement scale by using the substitute subjected to numerical value tracing;
step E: calibrating a single-bucket material reduction scale;
step F: and the precision of the weight reduction scale is verified in a production process.
The technical scheme of the invention is further improved as follows: in the step A, the substitutes comprise a large-mass series substitute and a small-mass series substitute, the number of the large-mass series substitutes is multiple, the total mass of the large-mass series substitutes is equal to the full load range of the decrement scale, and the mass error between the single large-mass series substitutes is less than 1 percent; the small-mass series substitutes are selected according to different multiples of the division value E of the decrement scale, and a plurality of small-mass series substitutes are arranged in each same multiple.
The technical scheme of the invention is further improved as follows: the number of the large-mass series substitutes is 5; the small-mass series substitutes are selected according to 2 times, 1 time, 0.5 time and 0.25 time of the division value E of the decrement scale, 4 substitutes are marked, and 3 substitutes are respectively provided for 12 substitutes.
The technical scheme of the invention is further improved as follows: in the step B, the appearance cleaning of the substitute means that rust removal and corrosion prevention treatment is carried out to prevent the weight of the substitute from changing; the determination of the number, the sticking of the mark and the recording of the file of the substitute are to manage the substitute as a standard substance and ensure that the precision of the substitute is 1-2 levels higher than that of the decrement scale.
The technical scheme of the invention is further improved as follows: and C, carrying out numerical traceability on the substitute in the step C, namely, sending the substitute into a standard mass calibrator and a calibration balance of a mass standard room to carry out verification one by one, confirming the actual mass of the substitute, and clearly recording the actual mass on a substitute equipment file and a mark.
The technical scheme of the invention is further improved as follows: the static calibration process in the step D comprises a linear increasing process, a linear decreasing process and sensitivity calibration, and specifically comprises the following steps:
stopping the operation of the decrement scale, emptying the decrement scale and accessory equipment materials, setting the decrement scale to be zero, gradually increasing and hanging the substitutes of large mass series into the decrement scale calibration support according to the numbering sequence, respectively setting the mass of the decrement scale according to the total mass of the added substitutes until the decrement scale is fully loaded, and the process is a linear increasing process;
the large-mass series substitutes are hung on a decrement scale calibration support in a reduced mode one by one according to the numbering sequence, the decrement scale is observed according to the total mass of the reduced substitutes, the mass is displayed until all the substitutes are taken down, the display numerical value of the decrement scale is equal to the zero setting value, and the process is a linear decrement process;
in the process of linear addition and linear decrement of the large-mass series substitutes, when each substitute is added/subtracted, the small-mass series substitutes are respectively added/subtracted on the large-mass series substitutes of the decrement scale one by one according to the mass sequence, the mass displayed by the decrement scale according to the total mass of the added/subtracted large-mass series substitutes and the small-mass series substitutes is observed until all the substitutes are removed, the displayed value of the decrement scale is equal to the zero setting mark, and the calibration of the sensitivity of the decrement scale in the process of linear addition and linear decrement is carried out.
The technical scheme of the invention is further improved as follows: the single-bucket material verification weight reduction scale in the step E is to statically calibrate the weight reduction scale, load several tons of materials (for example, 5 tons) into the scale bucket of the weight reduction scale, set the frequency converter of the weight reduction scale to the frequency used at ordinary times according to the process requirements, make the discharging spiral of the weight reduction scale rotate to perform discharging operation, when the weight reduction scale displays that discharging is completed (discharging is 5 tons), stop the discharging frequency converter, stop the discharging operation process of the single bucket, and thus confirm the discharging accuracy of the weight reduction scale when the single bucket materials are discharged.
The technical scheme of the invention is further improved as follows: and step F, comparing the net weight of the material in the reducing scale hopper detected by the trade weighing scale with the net weight of the material discharged by the reducing scale for a period of time, verifying the precision of the reducing scale in the production process, and calibrating the reducing scale by using a substitute at any time when the error is found to exceed 0.3 percent so as to achieve the aim of accurate metering of the reducing scale. This is a guiding idea for the user to use,
operating the decrement scale to reset the total accumulated metering data or record the total accumulated metering data, recording a calibration record, setting a decrement scale parameter adjustment password, and sealing the decrement scale operation key; then, the total mass of the warehousing materials entering the decrement scale within a period of time is adjusted from a weighing system of the trade weighing scale; finally, the operation key of the weight-reducing scale is unlocked, and the total mass of the discharged materials of the weight-reducing scale in the same time period is checked; comparing the measurement data of the trade weighing scale and the decrement scale, and finding whether the precision of the decrement scale meets the process requirement or not at any time when finding that the error exceeds 0.3 percent. This is a specific step.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
the invention saves manpower, improves operation convenience, can calibrate the weight-reducing scale in time, can verify a real object in the using process, improves the precision of the weight-reducing scale and ensures that the added materials basically accord with actual requirements.
The present invention makes large/small mass series of substitutes according to the measuring range and field condition of the weight-reducing balance. The prepared series of substitutes are traced to the source, numbered and stored on a platform of a special house in a production field, and the precision of the standard substances completely accord with calibration and is 1 to 2 grades higher than that of a decrement scale. In actual production, the net weight data of the material weighed by the trade weighing balance is compared with the net weight data of the material dispensed by the weight reducing scale, and when the error is found to exceed 0.3%, the weight reducing scale is calibrated by using a substitute at any time, so that the aim of accurate metering of the weight reducing scale is fulfilled. The mass of the large-mass series substitutes is about 1000Kg, and the mass of the small-mass series substitutes is between 3334g and 416.75g, so that the large-mass series substitutes are convenient to operate and are made into movable devices with hoisting rings.
Drawings
FIG. 1 is a simplified static calibration of the present invention;
FIG. 2 is a schematic diagram of the magnitude tracing of the large mass series substitutes and the small mass substitutes of the present invention;
FIG. 3 is a flow chart of the data comparison process for the trade weighing scale and the decrement scale of the present invention;
wherein: 1. the device comprises a storage bin, 2, a weighing sensor, 3, a weighing control instrument, 4, a discharge screw, 5, a vibrator, 6, a screw motor, 7, a lifting steel wire rope, 8, a large-mass series substitute, 9, a winch, 10, a fixed pulley, 11, a feeding port, 12, a blow-off valve, 13, a small-mass series substitute, 14, a standard chamber winch support, 15, a winch, 16, a standard mass calibrator, 17 and a calibration balance.
Detailed Description
The present invention will be described in further detail with reference to examples.
The invention discloses a method for calibrating a decrement scale by using a mobile substitute, which comprises the following steps with reference to figures 1-3:
step A: selecting a substitute, namely selecting a calibrated substitute according to the field condition and the decrement scale range;
and B, step B: cleaning the appearance of the selected substitute, determining a number, pasting an identifier and recording files;
and C: carrying out numerical value tracing on the selected substitute;
step D: carrying out static calibration on the decrement scale by using the substitute subjected to numerical value tracing;
and E, step E: calibrating a single-bucket material reduction scale;
step F: and the precision of the weight reduction scale is verified in a production process.
In the step A, the substitutes comprise a large-mass series substitute and a small-mass series substitute, the number of the large-mass series substitutes is multiple, the total mass of the large-mass series substitutes is equal to the full load range of the decrement scale, and the mass error between the single large-mass series substitutes is less than 1 percent; the small-mass series substitutes are selected according to different multiples of the division value E of the decrement scale, and a plurality of small-mass series substitutes are arranged in each same multiple.
Preferably, the number of large mass series substitutes is 5; the small-mass series substitutes are selected according to 2 times, 1 time, 0.5 time and 0.25 time of decrement scale division value E, 4 substitutes are marked, and the total number of 3 substitutes is 12.
In the step B, the appearance cleaning of the substitute means that rust removal and corrosion prevention treatment is carried out to prevent the weight of the substitute from changing; the determination of the number, the sticking of the identification and the recording of the file for the substitute is to manage the substitute as a standard substance and ensure that the precision of the substitute is 1-2 grades higher than that of the decrement scale.
And C, carrying out numerical traceability on the substitute in the step C, namely, sending the substitute into a standard mass calibrator and a calibration balance of a mass standard room to carry out verification one by one, confirming the actual mass of the substitute, and clearly recording the actual mass on a substitute equipment file and a mark.
The static calibration process in the step D comprises a linear increasing process, a linear decreasing process and sensitivity calibration, and specifically comprises the following steps:
stopping the operation of the weight reducing scales, emptying materials of the weight reducing scales and accessory equipment, setting the weight reducing scales to zero, gradually increasing and hanging the large-mass series substitutes into the weight reducing scale calibration support according to the number sequence, and respectively setting the mass of the weight reducing scales according to the total mass of the added substitutes until the load is fully added, wherein the process is a linear increasing process;
the large-mass series substitutes are hung on a decrement scale calibration support in a reduced mode one by one according to the numbering sequence, the decrement scale is observed according to the total mass of the reduced substitutes, the mass is displayed until all the substitutes are taken down, the display numerical value of the decrement scale is equal to the zero setting value, and the process is a linear decrement process;
in the process of linear addition and linear decrement of the substitutes of the large mass series, when each substitute is added/reduced, the substitutes of the small mass series are respectively added/reduced on the substitutes of the large mass series of the decrement scale one by one according to the mass sequence, the mass displayed by the decrement scale according to the total mass of the substitutes of the large mass series and the substitutes of the small mass series is observed until all the substitutes are removed, the display value of the decrement scale is equal to the zero setting mark, and the calibration of the sensitivity of the decrement scale in the process of linear addition/linear decrement is carried out.
The step E of verifying the weight reducing scale for the single-bucket material refers to that after the weight reducing scale is statically calibrated, a plurality of tons of materials (for example, 5 tons) are loaded into a bucket of the weight reducing scale, according to the process requirements, the frequency converter of the weight reducing scale is set to be the frequency used at ordinary times, the discharging of the weight reducing scale is spirally rotated to perform discharging operation, when the weight reducing scale displays that discharging is completed (discharging is 5 tons), the discharging frequency converter stops operating, the discharging operation process of the single bucket stops, and accordingly the discharging accuracy of the weight reducing scale when the single bucket materials are loaded is confirmed.
And step F, comparing the net weight of the material in the reducing scale hopper detected by the trade weighing scale with the net weight of the material discharged by the reducing scale for a period of time, verifying the precision of the reducing scale in the production process, and calibrating the reducing scale by using a substitute at any time when the error is found to exceed 0.3 percent so as to achieve the aim of accurate metering of the reducing scale. This is the guiding idea.
Operating the decrement scale to reset the total accumulated metering data or record the total accumulated metering data, recording a calibration record, setting a decrement scale parameter adjustment password, and sealing the decrement scale operation key; then, the total mass of the warehousing materials entering the decrement scale within a period of time is called from a weighing system of the trade weighing scale; finally, the operation key of the weight reduction scale is deblocked, and the total mass of the discharged materials of the weight reduction scale in the same time period is checked; comparing the measurement data of the trade weighing scale and the decrement scale, and finding whether the precision of the decrement scale meets the process requirement or not at any time when finding that the error exceeds 0.3 percent. This is a specific step.
Reference is now made to fig. 1-3 for an exemplary detailed description.
Step A: the selection of substitutes, the selection of calibrated substitutes according to field conditions and the range of the decrement scale, the selection of trade weighing balance data in a period of time as the data required by a new substitute according to the production process, the selection of the substitutes for field calibration can be waste steel billets, steel ingots, welded iron plates and the like, and the requirements that the total mass of 5 substitutes in large mass series is approximately equal to the full load range of the decrement scale, the mass of a single substitute in large mass series is approximately equal (the error is within 1 percent) and the requirement that the mass of the substitute A-the mass of the substitute B)/the mass of the substitute A is less than 1 percent can be met.
The small-mass series substitutes are selected according to 2 times, 1 time, 0.5 time and 0.25 time of the division value of the decrement scale. In the large mass series substitute 8 of this embodiment, 5 cubes are made from a specification iron plate of 550mm 12mm (length and width and thickness), a waste steel billet is loaded in the cube, a hoisting ring is welded on the cube, 4 iron wheels are installed below the cube, and the mass is detected in a standard room after integral derusting, paint spraying and drying, and the mass is respectively: 001# (998.56 Kg), 002# (997.04 Kg), 003# (1002.60 Kg), 004# (994.01 Kg) and 005# (1003.21 Kg), which meet the quality requirement of the large-mass series substitute 8 of the weight-reducing scale with the measuring range of 5 tons.
The division number of the decrement scale is 3000, the verification division E =5000Kg/3000=1667g, and the small-mass series substitutes 13 are: 1667Kg × 2=3334g for 2-fold E, 1667g for 1-fold E, 1667g × 0.5=833g for 0.5-fold E, and 1667g × 0.25=416.75g for 0.25-fold E, and there are 4 in total of 12 for each 3.
And B: cleaning, derusting and corrosion preventing treatment according to the appearance of the substitute selected according to the measuring range, determining a number, pasting an identifier and recording a file. And D, respectively cleaning the appearances of the five large-mass series substitutes 8 and the four small-mass series substitutes 13 in the step A, ensuring the cleanness and no dirt, numbering and sticking marks, and recording the equipment files of the substitutes.
And C: and (4) tracing the value of the selected substitute according to the range.
The substitutes 8 and 13 in the large mass series are sent into a standard mass calibrator 16 and a calibration balance 17 of a mass standard room to trace the source one by one, the actual mass is confirmed, and the actual mass is clearly recorded on the device files and marks of the substitutes. The substitute after quality confirmation is used as a standard substance, damage is forbidden in the transportation process, the appearance is kept clean, and a dry ventilation space is placed to prevent the substitute from rusting to cause inaccurate quality.
Step D: and statically calibrating the decrement scale according to the selected substitute. According to the national standard requirements, the weighing control instrument 3 is utilized to start the decrement scale from zero (no material is loaded, the decrement scale sensor is free from other external force), the vibrator 5 and the spiral motor 6 are started in sequence, the internal remainders of the bin 1 and the discharge spiral 4 are emptied, and then the vibrator 5 is stopped and the spiral motor 6 is started.
Firstly, the 1# large mass series substitute 8 is moved to be arranged below the fixed pulley 10, the winch 9 is started to operate in the forward direction, the whole mass of the 1# large mass series substitute 8 acts on the weighing sensor 2, the display value of the weighing control instrument 3 is adjusted to be the same as that of the 1# large mass series substitute 8 (998.56 Kg), the winch 9 is started to operate in the reverse direction after adjustment, the 1# large mass series substitute 8 falls to the ground, and the weighing sensor 2 is set to be zero.
Secondly, moving the 2# large mass series substitute 8 below the fixed pulley 10, starting the forward running of the winch 9, applying the total mass of the 1# and 2# large mass series substitutes 8 to the weighing sensor 2, and adjusting the display value of the weighing control instrument 3, wherein the display value is added with the mass of the 1# and 2# large mass series substitutes 8: (998.56 Kg +997.04 Kg), which is input to the load cell 2, is a sequential incremental mass, calibrated decrement scale linear incremental operation. And then operating the winch 9 to run in reverse, putting down the 2# large-mass series substitutes 8, and viewing the mass of the 1# large-mass series substitutes 8 displayed by the weighing control instrument 3, wherein the mass is reduced sequentially, and the calibration decrement scale is operated in a linear decrement mode. And applying the total mass of the 3#, 4#, and 5# large mass series substitutes 8 to the weighing sensor 2 according to the operation sequence, and then sequentially reducing the mass, and calibrating the linear reduction operation of the decrement scale. The process is respectively calibrated according to the mass of 20%, 40%, 60%, 80% and 100% of the measuring range, and the linearization of the weighing data of the decrement scale is ensured.
In the process of linearly increasing/decreasing the large-mass-series substitutes 8, in the process of increasing/decreasing one large-mass-series substitute 8, respectively placing the small-mass-series substitutes 13 on the large-mass-series substitutes 8 of the decrement scale one by one according to the mass sequence, and observing the mass displayed by the weighing control instrument 3 of the decrement scale according to the total mass of the large-mass-series substitutes 8 and the small-mass-series substitutes 13, until all the substitutes are removed, and the displayed value of the decrement scale is equal to the 'zero' mark. This is a calibration of the decrement scale sensitivity during linear increment/decrement.
And E, step E: the single-bucket material verification weight reduction scale. After static calibration decrement balance, guarantee the precision under the quiescent condition of decrement balance, the state of simulation decrement balance operation, open pan feeding mouth 11 and put into the material, diffuse valve 12 and open simultaneously, about 5 tons after the material is filled up, close pan feeding mouth 11, give material volume V ton/second at the manual settlement of central control room, screw motor 6 is rotatory, the ejection of compact spiral 4 that makes the decrement balance rotates carries out row material operation, because the range of decrement balance is 5 tons, when decrement balance shows row material 5 tons, arrange the material converter and stop the operation, the row material operation process of single fill stops, with the precision of this single fill material is verified in getting rid of.
Step F: and the precision of the decrement scale is verified in a production process. Comparing the accumulated metering data of the trade weighing scale and the discharging data of the calibrated decrement scale in the same time period within a certain time period, and verifying that the precision of the decrement scale in the use process meets the process requirement by using a real object. When the weight reducing scale is used, the weighing sensor 2 is impacted by materials to cause damage, the materials are condensed on one side of the scale bucket to cause unbalanced stress of the weighing sensor 2, and the vibrator 5 on the side wall outside the stock bin 1 frequently vibrates, so that the weighing is inaccurate. The installation of the weighing sensor 2, the zero drift of the weighing control instrument 3 and the signal interference can also cause the inaccurate weighing. Frequent use of physical calibration by the alternative method results in increased labor costs and reduced equipment operation rates.
Therefore, in order to avoid the above drawbacks, a comparison system (fig. 3) for comparing the accumulated measurement data of the trade weighing scale and the accumulated measurement data of the decrement weighing scale within a period of time is designed, and the working process of the system is as follows: the automobile transportation material is sent to a card making chamber and then is transported to a truck scale, and the data measured by a weight measuring system is X; and then the material is discharged by the bin and is output by a decrement scale to obtain accumulated data Y. And (4) calculating and comparing in the central control room, wherein when the (X-Y)/X is less than 0.5%, the comparison result is in a reasonable range, otherwise, the comparison is continued until the requirements are met.
The system may be operable on a computer: the total data of the decrement scale is reset at a certain time, and the data accumulated by the decrement scale is transmitted to a central control room through a data acquisition network. The decrement scale parameter adjustment password is set on site, the decrement scale operation key is sealed and stored, various parameters and accumulated data of the decrement scale cannot be modified, and the decrement scale is prevented from being interfered by human. The weight detecting system of the trade weight detecting balance is also led to the central control room. Therefore, the central control room can call the total mass of the material put into the warehouse of the decrement scale and the total mass of the trade weighing scale in any time period. And comparing the measurement data of the trade weighing scale and the weight reducing scale, and finding whether the precision of the weight reducing scale meets the process requirement at any time.
The calibration of the decrement scale of the bulk materials is always an industrial problem, and the calibration by using a standard weight cannot be realized due to the restriction of various factors. The method selects the substitute which is in accordance with the calibration quality range according to the measuring range of the decrement scale, and the quality value of the standard substance is transferred to the substitute after the appearance cleaning number of the substitute is traced to the source by the numerical value. Then, the decrement scale is statically calibrated by using the substitute, and the decrement scale hopper is dynamically calibrated on the basis. Whether the decrement scale keeps the calibrated precision or not can not be confirmed in the production process, so that the data checking and comparing system for materials of the decrement scale after passing through the trade weighing scale within a period of time is invented, and the precision of the decrement scale in the using process is ensured. The invention adopts the mode of calibrating the substitute obtained on site, has small investment and is easy to operate. The weight data of the trade weighing scale is used as a new substitute for calibrating the decrement scale, the data is flexible and solid, and the weight data is planted on the first hand of site data to guide the production to be huge.
Claims (6)
1. A method for calibrating and verifying the precision of a decrement scale by using a substitute is characterized by comprising the following steps:
step A: selecting a substitute, namely selecting a calibrated substitute according to the field condition and the decrement scale range;
and B, step B: cleaning the appearance of the selected substitute, determining a number, pasting an identifier and recording files;
and C: carrying out numerical value tracing on the selected substitute;
step D: carrying out static calibration on the decrement scale by using the substitute subjected to numerical value tracing;
and E, step E: calibrating a single-bucket material reduction scale;
step F: verifying the precision of the decrement scale in a production process by using a real object;
in the step A, the substitutes comprise a large-mass series substitute and a small-mass series substitute, the number of the large-mass series substitutes is multiple, the total mass of the large-mass series substitutes is equal to the full load range of the decrement scale, and the mass error between the single large-mass series substitutes is less than 1 percent; selecting the small-mass series substitutes according to different multiples of the division value E of the decrement scale, and arranging a plurality of small-mass series substitutes in each same multiple;
the static calibration process in the step D comprises a linear increasing process, a linear decreasing process and sensitivity calibration, and specifically comprises the following steps:
stopping the operation of the decrement scale, emptying the decrement scale and accessory equipment materials, setting the decrement scale to be zero, gradually increasing and hanging the substitutes of large mass series into the decrement scale calibration support according to the numbering sequence, respectively setting the mass of the decrement scale according to the total mass of the added substitutes until the decrement scale is fully loaded, and the process is a linear increasing process;
the large-mass series substitutes are gradually reduced according to the number sequence and hung on a weight-reducing scale calibration support, the weight-reducing scale is observed according to the total mass of the reduced substitutes and displays the mass until all the substitutes are taken down, the display numerical value of the weight-reducing scale is equal to zero, and the process is a linear decreasing process;
in the process of linear addition and linear decrement of the large-mass series substitutes, when each substitute is added/subtracted, the small-mass series substitutes are respectively added/subtracted on the large-mass series substitutes of the decrement scale one by one according to the mass sequence, the mass displayed by the decrement scale according to the total mass of the added/subtracted large-mass series substitutes and the small-mass series substitutes is observed until all the substitutes are removed, the displayed value of the decrement scale is equal to the zero setting mark, and the calibration of the sensitivity of the decrement scale in the process of linear addition and linear decrement is carried out.
2. The method of claim 1, wherein the method comprises the steps of: the number of the large mass series substitutes is 5; the small-mass series substitutes are selected according to 2 times, 1 time, 0.5 time and 0.25 time of decrement scale division value E, 4 substitutes are marked, and the total number of 3 substitutes is 12.
3. The method of claim 1, wherein the method comprises the steps of: in the step B, the step of cleaning the appearance of the substitute refers to the step of carrying out rust removal and corrosion prevention treatment to prevent the weight of the substitute from changing; the determination of the number, the sticking of the identification and the recording of the file for the substitute is to manage the substitute as a standard substance and ensure that the precision of the substitute is 1-2 grades higher than that of the decrement scale.
4. The method of claim 1, wherein the method comprises the steps of calibrating the weight scale with the surrogate and verifying the accuracy of the weight scale with the surrogate: and C, carrying out numerical traceability on the substitute in the step C, namely, sending the substitute into a standard mass calibrator and a calibration balance of a mass standard room to carry out verification one by one, confirming the actual mass of the substitute, and clearly recording the actual mass on a substitute equipment file and a mark.
5. The method of claim 1, wherein the method comprises the steps of calibrating the weight scale with the surrogate and verifying the accuracy of the weight scale with the surrogate: the step E of verifying the weight reduction scale for the single-hopper materials refers to the step of loading a plurality of tons of materials into the hopper of the weight reduction scale after the weight reduction scale is statically calibrated, setting the frequency converter of the weight reduction scale to be the frequency used at ordinary times according to process requirements, enabling the discharging spiral of the weight reduction scale to rotate to perform discharging operation, stopping the discharging frequency converter when the weight reduction scale displays that discharging is completed, and stopping the discharging operation process of the single hopper so as to confirm the discharging precision of the weight reduction scale when the single hopper materials are discharged.
6. The method of claim 1, wherein the method comprises the steps of calibrating the weight scale with the surrogate and verifying the accuracy of the weight scale with the surrogate: and step F, comparing the net weight of the material in the weight reducing scale hopper detected by the trade weighing scale with the net weight of the material discharged by the weight reducing scale for a period of time, verifying the precision in the production process of the weight reducing scale, and calibrating the weight reducing scale by using a substitute at any time when the error is found to exceed 0.3 percent so as to achieve the aim of accurate measurement of the weight reducing scale.
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