CN111189517A - Detection and adjustment method for electronic truck scale - Google Patents
Detection and adjustment method for electronic truck scale Download PDFInfo
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- CN111189517A CN111189517A CN201910935707.4A CN201910935707A CN111189517A CN 111189517 A CN111189517 A CN 111189517A CN 201910935707 A CN201910935707 A CN 201910935707A CN 111189517 A CN111189517 A CN 111189517A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
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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
Abstract
The invention provides a detection and adjustment method of an electronic truck scale, which comprises a repeatability test, an unbalance loading test and a weighing test, wherein the electronic truck scale is formed by combining at least two independent weighing parts, mechanical components of the adjacent weighing parts are not interfered with each other, each weighing part meets the axle load requirement of a passing vehicle, and the range calibration of the electronic truck scale is completed by adopting weights meeting the calibration requirement of a single weighing part. The method of the invention can not only greatly reduce the detection and calibration cost of the electronic weighing instrument, but also improve the detection and calibration efficiency and reduce the working intensity and difficulty of detection and calibration personnel, and is particularly suitable for the detection and calibration of the large-range electronic weighing instrument.
Description
Technical Field
The invention relates to a detection and adjustment method of an electronic truck scale.
Background
With the continuous development of the electronic weighing apparatus industry, the electronic weighing apparatus is more and more widely used in the market, wherein the use of the automobile weighing apparatus is the most common. At present, the resolution of various automobile scales is continuously improved, and the measuring range is also continuously increased. The electronic truck scale is a main measuring instrument for measuring the mass value of bulk goods, is a measuring instrument commonly used for goods delivery and trade, is a measuring instrument closely related to the interests of both trade parties, and is a measuring instrument for forced verification. In order to ensure the accuracy of the electronic automobile weighing value, the quality of verification is ensured only by verifying through a metering mechanism by a national law.
According to the verification regulation of JJG539-97 digital indicating Scale, verification elements or steps mainly comprise: the basic information of the scale is known before verification, a verification order is filled in, information acquisition is carried out on a certificate after verification, and the accuracy grade, the maximum weighing, the minimum weighing, the division value, the section number of the scale body, a weighing instrument, a manufacturer and the like of the scale are acquired; the appearance of the scale body is checked, whether the scale body has deformation and cracking phenomena or not is checked, whether a gap of a limiting nut is proper or not is checked, whether sundries are blocked around the scale body and at the bottom of the scale body or not is checked for scales with severe use environments, whether lap joints between the sections are firm and reliable or not is checked for scales with multiple sections, whether a sensor and the scale body are in a horizontal, flat and vertical state or not is checked, and the like; the method comprises the following steps of (1) performing repeatability test, wherein the repeatability test is generally performed for scale verification, if the repeatability test is qualified, the next step can be performed, and generally, the upper weighing platform and the lower weighing platform of a balance checking vehicle can be used for testing during verification; the method comprises the following steps of (1) carrying out an offset load test, wherein the offset load test mainly comprises the steps of checking whether indication values of all weighing sensors are consistent; weighing and testing, namely respectively weighing and testing five test points of minimum weighing, 50e/500e, 200e/2000e, 50% Max and 100% Max according to the regulations, and recording data; and (4) processing the verification result, sealing the scales qualified in verification with lead, pasting a strong verification certificate and issuing a verification certificate, and issuing a verification result notice to the unqualified scales and forbidding the unqualified scales to use.
Along with the increase of the vehicle load capacity, the tonnage of the electronic truck scale is increased, the distribution and transportation of weights in various cities become a big problem from the former 50t wagon balance to the current 100t, 120t, 150t and 200t, the weights distributed by a verification department and the truck for weighing balance are limited by taking a certain area as an example, and the maximum weight carrying capacity of each truck for weighing balance is 20 t. For a fixed truck scale with the maximum weighing of 100t, at least 5 six-axis vehicles are required for transportation if weights are used completely, and more than 200 tens of thousands of detection equipment are required to be allocated, so that the detection cost is very large and the detection efficiency is very low; during the unbalance loading test, according to the verification rule, the weight of each corner loading weight is usually more than 20 tons, so that more weights are intensively placed at one corner of the weighing platform and are extremely difficult to place according to the size of the existing weighing body; in the repeatability test, the upper weighing platform and the lower weighing platform with a constant load are required to be used for testing for many times according to the regulation requirements, however, the actually used electronic automobile scale is basically higher than the ground level, if the weight with larger tonnage is used for the repeatability test, a large amount of manpower is required for assisting in the detection, and meanwhile, the problem that the sensor creeps due to the fact that the weight is pushed manually to stay for a long time on the weighing platform and the time is too long is also considered.
Disclosure of Invention
The invention aims to provide a detection and adjustment method of an electronic truck scale, which has low cost and high efficiency.
In order to achieve the above object, the present invention adopts the following technical solutions.
A detection and calibration method of an electronic truck scale comprises a repeatability test, an unbalance loading test and a weighing test, wherein the electronic truck scale is formed by combining at least two independent weighing parts, mechanical components of adjacent weighing parts are not interfered with each other, each weighing part meets the axle load requirement of a passing vehicle, and weights meeting the calibration requirement of a single weighing part are adopted to complete the range calibration of the electronic truck scale.
Further, the maximum weighing of each weighing part meets the axle load requirement of the over-weighed vehicle.
Further, for the replacement of the standard weight, if the repeatability of the electronic automobile scale is more than 0.3e, the standard weight for verification is at least M/2N; if the repeatability of the electronic automobile scale is not more than 0.3e, the standard weight part for verification can be reduced to M/3N; if the repeatability of the electronic automobile scale is not more than 0.2e, the standard weight part for verification can be reduced to M/5N; in the formula, M is the maximum weighing of the electronic truck scale, N is the number of weighing parts, and e is the division value of a single weighing part.
Preferably, the full-scale verification of the electronic automobile scale is completed by using a standard weight which is equal to the maximum weight of a single weighing part.
Preferably, the number of weighing parts can be determined according to the maximum axle load, decimal rounding and overload vehicle length requirement of the weighing/over-weighing vehicle which needs to be met by the electronic truck scale.
Furthermore, each weighing part is limited transversely and longitudinally through an independent limiting device, so that mechanical components of the adjacent weighing parts are not interfered with each other; the weighing sensor of each weighing part is connected with a weighing system, and the weighing system is used for identifying the digital signals of each weighing part and calculating and displaying the total weight information on all the weighing parts;
when the weighing system recognizes that the 1 st weighing part has a weight signal and the rest weighing parts have no weight signals, the weighing system only uses the weighing value and the division value corresponding to the 1 st weighing part and according to Wm＝Km1Calculating the total weight of the carried object; when the weighing system recognizes that the 1 st weighing part and the Nth weighing part have weight signals and the rest weighing parts have no weight signals, the weighing system uses the weighing values and the division values corresponding to the 1 st weighing part and the Nth weighing part and according to Wm＝Km1+KmNCalculating the total weight of the carried object; when the weighing system recognizes that all weighing parts have weight signals, the weighing system uses the weighing and division values corresponding to the 1 st, 2 nd and Nth weighing parts according to Wm＝Km1+Km2+Km3…+KmNCalculating the total weight of the carried object; in the formula, WmIs the total weight reading, K, of the combined multi-range electronic weighing apparatusm1Is a weight reading of the 1 st weighing part, Km2K is the weight reading of the 2 nd weighing partmNIs the weight reading of the nth weighing compartment.
Preferably, each weighing section has a length of 3-6 meters, and a suitable spacing between mechanical members of adjacent weighing sections is 1-300 mm; more preferably, a suitable spacing between the mechanical members of adjacent weighing sections is 1-15 mm.
Furthermore, for the electronic truck scale which needs to meet the requirement of 100-200 tons of maximum weighing, 5-6 independent weighing parts which have the maximum weighing of 40-80 tons can be combined according to the actual requirement.
Preferably, for an electronic truck scale weighing 100-200 tons at maximum, the calibration is carried out according to the specified requirements by using 8-20 ton standard weight and substitute.
Has the advantages that: by adopting the method, the detection and adjustment cost of the electronic weighing instrument can be greatly reduced, the detection and adjustment efficiency can be improved, and the working intensity and difficulty of detection and adjustment personnel can be reduced; the method is particularly suitable for detection and calibration of a large-range electronic weighing apparatus, if the repeatability of the electronic automobile weighing apparatus with the maximum weighing of hundreds of tons and above is more than 0.3e, the conventional method at least needs to adopt 50 tons of weights and substitutes to carry out calibration according to the specified requirement 'JJG 539-2015 digital indicating scale calibration procedure', the method can carry out detection and calibration according to the specified requirements only by adding 8-20 tons of standard weights and substitutes, compared with the method, the method not only can reduce the standard weights for detection and calibration by at least 50 percent, and the detection and adjustment replacement times can be reduced, the detection coverage can be enlarged, the legal metering accuracy and the national verification regulation execution degree are improved, the equipment asset allocation quantity of a detection mechanism is reduced, and a reference basis is provided for compiling a new digital indicator scale verification regulation.
Drawings
FIG. 1 is a schematic diagram of an electronic truck scale used in the embodiment I;
FIG. 2 is a schematic view of an electronic truck scale used in the embodiment II;
in the figure: 11-single weighing part, 112-weighing sensor, 121-weighing platform of 1 st weighing part, 122-weighing platform of 2 nd weighing part, 123-weighing platform of 3 rd weighing part, 124-weighing platform of 4 th weighing part, 21-electronic weighing instrument, 211-junction box, 212-weighing display end.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but the following embodiments are only used for understanding the principle of the present invention and the core idea thereof, and do not limit the scope of the present invention. It should be noted that modifications to the invention as described herein, which do not depart from the principles of the invention, are intended to be within the scope of the claims which follow.
Example 1
A detection and calibration method of an electronic truck scale comprises a repeatability test, an unbalance loading test and a weighing test, wherein the measuring range calibration of the electronic truck scale is completed by adopting weights meeting the calibration requirements of a single weighing part 11.
According to the requirement, if the electronic weighing apparatus is required to meet the weighing requirement of 100 tons of goodsConsidering that the axle load requirement of the rear axle of a commonly-used over-weighed vehicle is 38.2 tons, the electronic truck scale in this embodiment may be formed by combining four independent weighing units weighing 40 tons at maximum (as shown in fig. 1 and 2), where a division value e of each weighing unit is 20Kg, a length of each weighing unit is 4 meters, a suitable distance between mechanical components of adjacent weighing units is 10mm, the mechanical components of adjacent weighing units do not interfere with each other, and each weighing unit meets the axle load requirement of the over-weighed vehicle. Each weighing part is also transversely and longitudinally limited by an independent limiting device, so that mechanical components of the adjacent weighing parts are not interfered with each other. Four weighing sensors 112 are arranged below the weighing platform of each weighing part, the weighing sensor 112 of each weighing part is connected with a weighing system, and the weighing system is used for identifying digital signals of each weighing part and calculating and weighing total weight information on all the weighing parts displayed by a weighing display end 212; when the weighing system recognizes that the 1 st weighing part has a weight signal and the rest weighing parts have no weight signals, the weighing system only uses the weighing value and the division value corresponding to the 1 st weighing part and according to Wm＝Km1Calculating the total weight of the carried object; when the weighing system recognizes that the 1 st weighing part and the Nth weighing part have weight signals and the rest weighing parts have no weight signals, the weighing system uses the weighing values and the division values corresponding to the 1 st weighing part and the Nth weighing part and according to Wm＝Km1+KmNCalculating the total weight of the carried object; when the weighing system recognizes that all weighing parts have weight signals, the weighing system uses the weighing and division values corresponding to the 1 st, 2 nd and Nth weighing parts according to Wm＝Km1+Km2+Km3…+KmNCalculating the total weight of the carried object; in the formula, WmIs the total weight reading, K, of the combined multi-range electronic weighing apparatusm1Is a weight reading of the 1 st weighing part, Km2K is the weight reading of the 2 nd weighing partmNIs the weight reading of the nth weighing compartment.
When the electronic weighing machine is used, the CPU of the electronic weighing machine executes the following steps and algorithms after recognizing the weight signals of the weighing parts: when the weighing system recognizes that the 1 st weighing part has a weight signal and the rest weighing parts have no weight signals, the weighing system only uses the weighing part corresponding to the 1 st weighing partAnd division value, and according to Wm＝Km1Calculating the total weight of the carried objects, and displaying the total weight of the carried objects; when the weighing system recognizes that the 1 st weighing part and the nth weighing part have weight signals and the rest weighing parts have no weight signals, the weighing system uses the weighing values and the division values corresponding to the 1 st weighing part and the nth weighing part and according to Wm＝Km1+KmnCalculating the total weight of the carried objects, and displaying the total weight of the carried objects; when the weighing system recognizes that all weighing parts have weight signals, the weighing system uses the weighing and division values corresponding to the 1 st, 2 nd and nth weighing parts and according to Wm＝Km1+Km2+Km3…+KmnThe total weight of the load is calculated and displayed (this algorithm is also used by the electronic scale in the subsequent examples).
In the present embodiment, the maximum weight of each independent weighing unit is 40 tons, and the corresponding division value e-d is 20Kg, so that the maximum weight of the electronic truck scale combined by four independent weighing units is 160 tons, the minimum weight is 400Kg, and the weighing range is 400Kg-160 tons. That is, with the electronic truck scale in this embodiment, the weighing range of the electronic scale that needs to meet the weighing requirement of 100 tons can be expanded to 400Kg-160 tons.
During detection and calibration, each independent weighing part is respectively calibrated, namely the weighing parts weighing 40 tons at maximum are respectively calibrated; for the replacement of the standard weight, if the repeatability of the electronic automobile scale is more than 0.3e (6Kg), the standard weight for verification is at least M/2N (20 tons); if the repeatability of the electronic automobile scale is not more than 0.3e (6Kg), the standard weight part for verification can be reduced to M/3N (14 tons); if the repeatability of the electronic automobile scale is not more than 0.2e (4Kg), the standard weight part for verification can be reduced to M/5N (8 tons); in the formula, M is the maximum weighing of the electronic truck scale, N is the number of weighing parts, and e is the division value of a single weighing part.
Firstly, checking a nameplate of the electronic automobile scale: the type, the large-scale Max, the small-scale Min, the division value e, the production unit, the factory serial number, the factory date and the qualified certificate, and if the inspector finds that the part is unqualified, the inspector can inform the manufacturer to do the related content and also can suspend the detection and adjustment work of other items.
Zero point verification: firstly, setting a single weighing part to zero, successively adding a weight of 0.1e (2Kg) until the display value is e (20Kg), and calculating the zero error according to the requirements of JJG-539 verification procedures.
Weighing verification (test): small weights e (20Kg), 50e (1000Kg), 200e (4000Kg), 50% maximum weight (20 tons), and maximum weights (40 tons) were placed on the weighing platforms of the individual weighing units in order from small to large, and it was verified whether the corresponding display values were I ═ e, I ═ 50e, I ═ 200e, I ═ 50% maximum weight, and I ═ maximum weight within the allowable error range. In this step, in the case of meeting the requirements of the jjjg-539 certification regulations, the 40-ton weight may consist of a 20-ton standard weight + the dead weight of the delivery vehicle (20 tons).
And (3) repeatability test: and (3) repeatedly weighing two groups of the materials three times in each group according to 50% of maximum weighing (20 tons) and maximum weighing (40 tons), calculating a repeatability error value according to the rule of the two groups of weighing values, and verifying that the repeatability error value meets the requirement of the rule. In this step, in the case of meeting the requirements of the jjjg-539 certification regulations, the 40-ton weight may consist of a 20-ton standard weight + the dead weight of the delivery vehicle (20 tons).
Electronic truck scale peeling test: to test the accuracy of the peeling apparatus, 3 steps of testing were performed. In the range of peeling, peeling tests were performed for a small weight (20Kg), a 50% maximum weight (20 tons), and a maximum weight (40 tons), respectively. In this step, in the case of meeting the requirements of the jjjg-539 certification regulations, the 40-ton weight may consist of a 20-ton standard weight + the dead weight of the delivery vehicle (20 tons).
And (3) unbalance loading test: a small weight of 10e (200Kg) is placed at each corner of the weighing platform of all the single weighing parts, the corresponding displayed value is I, the small weight is added on the weighing platform until the displayed value is I + e, and the error of each point is calculated according to the calculation method required in the JJJG-559 protocol.
According to the detection and calibration method in the embodiment, for calibrating the electronic weighing apparatus with the maximum weight of 160 tons, no matter how repetitive, the calibration department can complete the detection and calibration only by equipping 20 tons of standard weights and substitutes, and for the substitutes with the maximum weight of about 20 tons, vehicles for transporting the standard weights can be directly adopted. If a conventional method is adopted, if the repeatability of the electronic automobile scale is more than 0.3e, the verification department at least needs to prepare 80 tons of standard weights and substitutes to finish the verification; if the repeatability of the electronic automobile scale is not more than 0.3e, the verification department can complete verification only by at least preparing a 54-ton standard weight and a substitute; if the repeatability of the electronic automobile scale is not more than 0.2e, the verification department at least needs to be equipped with 34 tons of standard weights and substitutes to complete the verification. For the replacement weights of more than 30 tons, the requirements cannot be met by the common transport vehicle, and the replacement with large weight is difficult to find on the verification site. Compared with the prior art, under the same repeatability condition, the method in the embodiment can reduce the number of detection and adjustment replacements by at least 50% of the standard weights for detection and adjustment, can expand the detection coverage, improve the legal metering accuracy and the national verification procedure execution degree, and greatly reduce the equipment asset allocation amount of the detection mechanism.
Example 2
A detection and calibration method of an electronic truck scale comprises a repeatability test, an unbalance loading test and a weighing test, and the measurement range calibration of the electronic truck scale is completed by adopting weights meeting the calibration requirements of a single weighing part.
According to the requirement, if the electronic weighing apparatus is required to meet the weighing requirement of 120-ton goods, the rear axle load requirement of a commonly-used over-weighed vehicle is considered to be 50 tons. The electronic truck scale in this embodiment may be formed by combining four independent weighing portions weighing 50 tons at maximum, where the division value e of each weighing portion is 20Kg, the length of each weighing portion is 5 meters, the suitable distance between the mechanical members of the adjacent weighing portions is 15mm, the mechanical members of the adjacent weighing portions do not interfere with each other, and each weighing portion meets the axle load requirement of an over-weighed vehicle. Each weighing part is also transversely and longitudinally limited by an independent limiting device, so that mechanical components of the adjacent weighing parts are not interfered with each other. Four weighing sensors are arranged below a weighing platform of each weighing part, the weighing sensor of each weighing part is connected with a weighing system, and the weighing system is used for identifying digital signals of each weighing part and calculating and displaying total weight information on all the weighing parts; when the weighing system recognizes that the 1 st weighing part is heavyWhen the weighing system has no weighing signal, the weighing system only uses the weighing and division values corresponding to the 1 st weighing part according to the Wm＝Km1Calculating the total weight of the carried object; when the weighing system recognizes that the 1 st weighing part and the Nth weighing part have weight signals and the rest weighing parts have no weight signals, the weighing system uses the weighing values and the division values corresponding to the 1 st weighing part and the Nth weighing part and according to Wm＝Km1+KmNCalculating the total weight of the carried object; when the weighing system recognizes that all weighing parts have weight signals, the weighing system uses the weighing and division values corresponding to the 1 st, 2 nd and Nth weighing parts according to Wm＝Km1+Km2+Km3…+KmNCalculating the total weight of the carried object; in the formula, WmIs the total weight reading, K, of the combined multi-range electronic weighing apparatusm1Is a weight reading of the 1 st weighing part, Km2K is the weight reading of the 2 nd weighing partmNIs the weight reading of the nth weighing compartment.
In the present embodiment, the maximum weight of each independent weighing unit is 50 tons, and the corresponding division value e-d is 20Kg, so that the maximum weight of the electronic truck scale combined by four independent weighing units is 200 tons, the minimum weight is 400Kg, and the weighing range is 400Kg-200 tons. That is, with the electronic truck scale in this embodiment, the weighing range of the electronic scale that needs to meet the weighing requirement of 120 tons can be expanded to 400Kg-200 tons.
During detection and calibration, each independent weighing part is respectively calibrated, namely the weighing parts weighing 50 tons at maximum are respectively detected and calibrated; for the replacement of the standard weight, if the repeatability of the electronic automobile scale is more than 0.3e (6Kg), the standard weight for verification is at least M/2N (25 tons); if the repeatability of the electronic automobile scale is not more than 0.3e (6Kg), the standard weight part for verification can be reduced to M/3N (17 tons); if the repeatability of the electronic automobile scale is not more than 0.2e (4Kg), the standard weight part for verification can be reduced to M/5N (10 tons); in the formula, M is the maximum weighing of the electronic truck scale, N is the number of weighing parts, and e is the division value of a single weighing part.
Firstly, checking a nameplate of the electronic automobile scale: the type, the large-scale Max, the small-scale Min, the division value e, the production unit, the factory number, the factory date and the qualified certificate, and if the inspector finds that the part is unqualified, the manufacturer can be informed to make up the relevant content and can pause the verification work of other projects.
Zero point verification: firstly, setting a single weighing part to zero, successively adding a weight of 0.1e (2Kg) until the display value is e (20Kg), and calculating the zero error according to the requirements of JJG-539 verification procedures.
Weighing verification (test): small weights e (20Kg), 50e (1000Kg), 200e (4000Kg), 50% maximum weight (25 tons), and maximum weights (50 tons) were placed on the weighing platforms of the individual weighing units in order from small to large, respectively, and it was verified whether the corresponding displayed values were I ═ e, I ═ 50e, I ═ 200e, I ═ 50% maximum weight, and I ═ maximum weight within the allowable error range. In this step, in the case of meeting the requirements of the jjjg-539 certification regulations, a 50-ton weight may consist of a 25-ton standard weight + the own weight of the transport vehicle (25 tons).
And (3) repeatability test: and (3) repeatedly weighing two groups of the materials three times in each group according to 50% of the maximum weight (25 tons) and the maximum weight (50 tons), calculating a repeatability error value according to the rule of the two groups of weighing values, and checking that the repeatability error value meets the requirement of the rule. In this step, in the case of meeting the requirements of the jjjg-539 certification regulations, a 50-ton weight may consist of a 25-ton standard weight + the own weight of the transport vehicle (25 tons).
Electronic truck scale peeling test: to test the accuracy of the peeling apparatus, 3 steps of testing were performed. In the range of peeling, peeling tests were performed for a small weight (20Kg), a 50% maximum weight (25 tons), and a maximum weight (50 tons), respectively. In this step, in the case of meeting the requirements of the jjjg-539 certification regulations, a 50-ton weight may consist of a 25-ton standard weight + the own weight of the transport vehicle (25 tons).
And (3) unbalance loading test: a small weight of 10e (200Kg) is placed at each corner of the weighing platform of all the single weighing parts, the corresponding displayed value is I, the small weight is added on the weighing platform until the displayed value is I + e, and the error of each point is calculated according to the calculation method required in the JJJG-559 protocol.
According to the detection and calibration method in the embodiment, for calibrating the electronic weighing apparatus with the maximum weight of 200 tons, no matter how repetitive, the calibration department can complete the detection and calibration only by equipping 25 tons of standard weights and substitutes, and for the substitutes with the maximum weight of about 25 tons, vehicles for transporting the standard weights can be directly adopted. If a conventional method is adopted, if the repeatability of the electronic automobile scale is more than 0.3e, the verification department at least needs to prepare 100 tons of standard weights and substitutes to finish the verification; if the repeatability of the electronic automobile scale is not more than 0.3e, the verification department can finish verification only by at least preparing 67 tons of standard weights and substitutes; if the repeatability of the electronic automobile scale is not more than 0.2e, the verification department at least needs to be equipped with 40 tons of standard weights and substitutes to finish the verification. For the replacement weights of more than 30 tons, the requirements cannot be met by the common transport vehicle, and the replacement with large weight is difficult to find on the verification site. Compared with the prior art, under the same repeatability condition, the method in the embodiment can reduce the number of detection and adjustment replacements by at least 50% of the standard weights for detection and adjustment, can expand the detection coverage, improve the legal metering accuracy and the national verification procedure execution degree, and greatly reduce the equipment asset allocation amount of the detection mechanism.
Example 3
A detection and calibration method of an electronic truck scale comprises a repeatability test, an unbalance loading test and a weighing test, and the measurement range calibration of the electronic truck scale is completed by adopting weights meeting the calibration requirements of a single weighing part.
According to the requirement, if the electronic weighing apparatus is to meet the weighing requirement of 400-ton goods, the axle load requirement of the over-weighed vehicle (comprising a tractor and a trailer, and an overweight vehicle group loaded with 200-ton and 300-ton) is considered to be 70-ton. The electronic truck scale in this embodiment may be formed by combining eight independent weighing portions weighing 60 tons at maximum, where the division value e of each weighing portion is 20Kg, the length of each weighing portion is 4.2 meters, the suitable distance between the mechanical members of adjacent weighing portions is 12mm, the mechanical members of adjacent weighing portions do not interfere with each other, and each weighing portion meets the axle load requirement of an over-weighed vehicle. Each weighing part is also transversely and longitudinally limited by an independent limiting device, so that mechanical components of the adjacent weighing parts are not interfered with each other. Of each weighing sectionFour weighing sensors are arranged below the weighing platform, the weighing sensor of each weighing part is connected with a weighing system, and the weighing system is used for identifying digital signals of each weighing part and calculating and displaying total weight information on all the weighing parts; when the weighing system recognizes that the 1 st weighing part has a weight signal and the rest weighing parts have no weight signals, the weighing system only uses the weighing value and the division value corresponding to the 1 st weighing part and according to Wm＝Km1Calculating the total weight of the carried object; when the weighing system recognizes that the 1 st weighing part and the Nth weighing part have weight signals and the rest weighing parts have no weight signals, the weighing system uses the weighing values and the division values corresponding to the 1 st weighing part and the Nth weighing part and according to Wm＝Km1+KmNCalculating the total weight of the carried object; when the weighing system recognizes that all weighing parts have weight signals, the weighing system uses the weighing and division values corresponding to the 1 st, 2 nd and Nth weighing parts according to Wm＝Km1+Km2+Km3…+KmNCalculating the total weight of the carried object; in the formula, WmIs the total weight reading, K, of the combined multi-range electronic weighing apparatusm1Is a weight reading of the 1 st weighing part, Km2K is the weight reading of the 2 nd weighing partmNIs the weight reading of the nth weighing compartment.
In the present embodiment, the maximum weight of each independent weighing unit is 60 tons, and the corresponding division value e is 20Kg, so that the maximum weight of the electronic truck scale combined by eight independent weighing units is 480 tons, the minimum weight is 400Kg, and the weighing range is 400Kg-480 tons. That is, with the electronic truck scale in this embodiment, the weighing range of the electronic scale that needs to satisfy the weighing requirement of 400 tons can be expanded to 400Kg-480 tons.
During detection and adjustment, each independent weighing part is respectively verified, namely the weighing parts with the maximum weight of 60 tons are respectively verified; for the replacement of the standard weight, if the repeatability of the electronic automobile scale is more than 0.3e (6Kg), the standard weight for verification is at least M/2N (30 tons); if the repeatability of the electronic automobile scale is not more than 0.3e (6Kg), the standard weight part for verification can be reduced to M/3N (20 tons); if the repeatability of the electronic automobile scale is not more than 0.2e (4Kg), the standard weight part for verification can be reduced to M/5N (12 tons); in the formula, M is the maximum weighing of the electronic truck scale, N is the number of weighing parts, and e is the division value of a single weighing part.
Firstly, checking a nameplate of the electronic automobile scale: the type, the large-scale Max, the small-scale Min, the division value e, the production unit, the factory number, the factory date and the qualified certificate, and if the inspector finds that the part is unqualified, the manufacturer can be informed to make up the relevant content and can pause the verification work of other projects.
Zero point verification: firstly, setting a single weighing part to zero, successively adding a weight of 0.1e (2Kg) until the display value is e (20Kg), and calculating the zero error according to the requirements of JJG-539 verification procedures.
Weighing verification (test): small weights e (20Kg), 500e (10 tons), 2000e (40 tons), 50% maximum weight (30 tons), and maximum weights (60 tons) were placed on the weighing platforms of the individual weighing units in order from small to large, and it was verified whether the corresponding indicated values were I ═ e, I ═ 500e, I ═ 2000e, I ═ 50% maximum weight, and I ═ maximum weight within the allowable error range. In this step, a 60 ton weight may consist of a 30 ton standard weight + the transport vehicle weight and other alternatives (30 tons) in case the requirements of the jjjg-539 certification code are met.
And (3) repeatability test: and (3) repeatedly weighing two groups of the materials three times and three times according to 50% of the maximum weight (30 tons) and the maximum weight (60 tons), calculating a repeatability error value according to the rule of the two groups of weighing values, and checking that the repeatability error value meets the requirement of the rule. In this step, a 60 ton weight may consist of a 30 ton standard weight + the transport vehicle weight and other alternatives (30 tons) in case the requirements of the jjjg-539 certification code are met.
Electronic truck scale peeling test: to test the accuracy of the peeling apparatus, 3 steps of testing were performed. In the range of peeling, peeling tests were performed for a small weight (20Kg), a 50% maximum weight (30 tons), and a maximum weight (60 tons), respectively. In this step, a 60 ton weight may consist of a 30 ton standard weight + the transport vehicle weight and other alternatives (30 tons) in case the requirements of the jjjg-539 certification code are met.
And (3) unbalance loading test: a small weight of 10e (200Kg) is placed at each corner of the weighing platform of all the single weighing parts, the corresponding displayed value is I, the small weight is added on the weighing platform until the displayed value is I + e, and the error of each point is calculated according to the calculation method required in the JJJG-559 protocol.
According to the detection and calibration method in the embodiment, for calibrating the electronic weighing apparatus with the maximum weight of 480 tons, no matter how repetitive, the calibration department can complete the detection and calibration only by equipping 30 tons of standard weights and substitutes, and for the substitutes with the maximum weight of about 30 tons, vehicles for transporting the standard weights and other substitutes can be directly adopted. If a conventional method is adopted, if the repeatability of the electronic automobile scale is more than 0.3e, the verification department at least needs to prepare 240 tons of standard weights and substitutes to finish the verification; if the repeatability of the electronic automobile scale is not more than 0.3e, the verification department can complete verification only by at least preparing 160 tons of standard weights and substitutes; if the repeatability of the electronic automobile scale is not more than 0.2e, the verification department at least needs to be equipped with 96 tons of standard weights and substitutes to complete the verification. For the replacement weights of more than 30 tons, the requirements cannot be met by the common transport vehicle, and the replacement with large weight is difficult to find on the verification site. In contrast, under the same repeatability condition, the method in the embodiment can reduce the number of detection and calibration replacements by at least 50% by using the standard weights for detection and calibration (the fewer the standard weights are, the more the replacements are), can expand the detection coverage, improve the legal metering accuracy and the execution degree of national verification regulations, and greatly reduce the equipment asset allocation amount of the detection mechanism.
When the electronic automobile scale is used, for electronic automobile scales with different specifications, the number of the weighing parts is determined according to the maximum axle load, decimal rounding and overload vehicle length requirement of a weighing/over-weighing vehicle which are required to be met by the electronic automobile scale, for example: when the electronic truck scale needs to meet the weighing requirement of 150 tons, the maximum over-weighed vehicle axle load is 60 tons, and the length of an overloaded vehicle is about 13 meters, the number of the weighing parts can be 150 tons/60 tons to 2.5, the decimal number is further rounded to 3, then the corresponding maximum weighing is 60 × 3 to 180 tons, and the length of each weighing part is at least 5 meters; if the length of the weighing part is set to be 4 meters, 4 weighing parts need to be arranged, and the corresponding maximum weighing is 60 × 4-240 tons; when the electronic truck scale needs to meet the weighing requirement of 90 tons, the maximum over-weighed vehicle axle load is 40 tons, and the length of the overloaded vehicle is about 11.5 meters, the number of the weighing parts can be 90 tons/40 tons to 2.25, the decimal number is further rounded to 3, then the corresponding maximum weighing is 40 x 3 to 120 tons, and the length of each weighing part is at least 4 meters; if the length of each weighing section is set to 3 meters, 4 weighing sections need to be laid, and the corresponding maximum weighing is 40 × 4-160 tons.
Claims (9)
1. The detection and calibration method of the electronic truck scale comprises repeatability test, unbalance loading test and weighing test, and is characterized in that: the electronic truck scale is formed by combining at least two independent weighing parts, mechanical components of the adjacent weighing parts are not interfered with each other, each weighing part meets the axle load requirement of a passing vehicle, and the weight meeting the verification requirement of the single weighing part is adopted to complete the range verification of the electronic truck scale.
2. The detection and calibration method according to claim 1, wherein: the maximum weighing of each weighing part meets the axle load requirement of the over-weighed vehicle.
3. The detection and calibration method according to claim 2, wherein: for the replacement of the standard weight, if the repeatability of the electronic automobile scale is more than 0.3e, the standard weight for verification is at least M/2N; if the repeatability of the electronic automobile scale is not more than 0.3e, the standard weight part for verification can be reduced to M/3N; if the repeatability of the electronic automobile scale is not more than 0.2e, the standard weight part for verification can be reduced to M/5N; in the formula, M is the maximum weighing of the electronic truck scale, N is the number of weighing parts, and e is the division value of a single weighing part.
4. The detection and calibration method according to claim 2, wherein: and the full-scale verification of the electronic automobile scale is completed by adopting the standard weight which is equal to the maximum weight of the single weighing part.
5. The detection and calibration method according to claim 2, wherein: the number of the weighing parts can be determined according to the maximum axle load, decimal rounding and overload vehicle length requirement of the weighing/over-weighing vehicle required by the electronic truck scale.
6. The detection and calibration method according to any one of claims 1 to 5, characterized in that: each weighing part is limited transversely and longitudinally through an independent limiting device, so that mechanical components of the adjacent weighing parts are not interfered with each other; the weighing sensor of each weighing part is connected with a weighing system, and the weighing system is used for identifying the digital signals of each weighing part and calculating and displaying the total weight information on all the weighing parts;
when the weighing system recognizes that the 1 st weighing part has a weight signal and the rest weighing parts have no weight signals, the weighing system only uses the weighing value and the division value corresponding to the 1 st weighing part and according to Wm＝Km1Calculating the total weight of the carried object; when the weighing system recognizes that the 1 st weighing part and the Nth weighing part have weight signals and the rest weighing parts have no weight signals, the weighing system uses the weighing values and the division values corresponding to the 1 st weighing part and the Nth weighing part and according to Wm＝Km1+KmNCalculating the total weight of the carried object; when the weighing system recognizes that all weighing parts have weight signals, the weighing system uses the weighing and division values corresponding to the 1 st, 2 nd and Nth weighing parts according to Wm＝Km1+Km2+Km3…+KmNCalculating the total weight of the carried object; in the formula, WmIs the total weight reading, K, of the combined multi-range electronic weighing apparatusm1Is a weight reading of the 1 st weighing part, Km2K is the weight reading of the 2 nd weighing partmNIs the weight reading of the nth weighing compartment.
7. The detection and calibration method according to claim 6, wherein: the length of each weighing part is 3-6 meters, and the suitable spacing between the mechanical members of adjacent weighing parts is 1-300 mm.
8. The detection and calibration method according to claim 7, wherein: for the electronic truck scale which needs to meet the requirement that the maximum weighing is 100-200 tons, the electronic truck scale can be formed by combining 5-6 independent weighing parts with the maximum weighing of 40-80 tons according to the actual requirement.
9. The detection and calibration method according to claim 8, wherein: for the electronic truck scale with the maximum weighing of 100-200 tons, the weight of 8-20 tons and the substitute are adopted to carry out verification according to the specified requirements.
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Application publication date: 20200522 |