CN102393243B - Self-positioning loading-unloading load measuring device for calibrating large-sized weighter - Google Patents

Abstract

The invention provides a self-positioning loading-unloading load measuring device for calibrating a large-sized weighter. The self-positioning loading-unloading load measuring device comprises a self-positioning loading-unloading mechanism used for loading and unloading a table-board of a weighing platform by replacing a standard weight or a substitute of the standard weight, and a high-precisionload measuring instrument adjacent to the upper end of the loading-unloading mechanism; and the accuracy of the high-precision load measuring instrument is at least three times that of the weighter. The self-positioning loading-unloading load measuring device is used in a system for calibrating the large-sized weighter, the work efficiency and safety can be greatly improved and the cost is saved when the self-positioning loading-unloading load measuring device calibrates the large-sized weighter, and various problems that the calibration workload is high, time consumption and labor consumption are high, the calibrating process is complicated, the accuracy cannot meet the requirement and the like when a fixed electronic weighter is calibrated by the standard weight or the standard weight and the substitute or other non-weight weighter calibrating device in the prior art can be solved.

Description

The self-location loading-unloading measuring device of calibrating large-scale weighing machine

The application is that application number is 201010223475.9, the applying date is 2010.06.30, invention and created name is divided an application for the patent application of " system and the self-location loading-unloading measuring device thereof of calibrating large-scale weighing machine ".

[technical field]

The present invention relates to a kind of calibrating of electronic scale, particularly a kind of self-location loading-unloading measuring device of examining and determine large-scale fixed electronic scale belongs to the measurement verification technical field.

[background technology]

Fixed electronic scale is the most ripe Weighing utensil of present technology in the world, belong to the measurement instrument that has a large capacity and a wide range, be widely used in the metering of the various load-carrying vehicles of metallurgy, chemical industry, harbour and industrial and mining enterprises and goods, and be used for the weigh technology controlling and process of flow process of trade settlement, production run, be the desirable metering outfit that the Weighing modernization level improves in enterprise.The principle of work of fixed electronic scale is that weigh thing or truck of quilt placed on the weighing platform, under the gravity effect, weighing platform with weight transfer to waving supporting (steel ball, pressure head etc.), make Weighing sensor elastomer produce deformation, be attached at the foil gauge bridge circuit out of trim on the elastic body, output and the directly proportional electric signal of gravimetric value are amplified signal through linear amplifier, be converted to digital signal through A/D again, by the microprocessor of instrument signal handled the back then and directly show the weight number.

Fixed electronic scale must be examined and determine before actual coming into operation, and determines its class of accuracy, in addition, fixed electronic scale is in use for some time or after changing device, also to examine and determine again, confirm its class of accuracy, make it to satisfy accuracy requirement in order to be adjusted accordingly.The standard that the fixed electronic scale of existing calibrating is used mainly contains three kinds, standard No. is to have spelt out in GB7723-2008's the national standard (this standard adopts international recommendation OIML R76 " non-automatic weighing apparatus " (2006E)) of " fixed electronic scale " to allow following three kinds of calibrating standards of adopting: the one, and counterweight specifically refers to standard test weight or standard quality; The 2nd, auxiliary calibrating installation refers to that specifically weighing apparatus is equipped with auxiliary calibrating installation or independently assists calibrating installation; The 3rd, calibrating substitutes with standard test weight, specifically refers to part of standards counterweight and other any fixed load alternate standard counterweights.

Yet the standard that regulation calibrating weighing apparatus is used in JJG539-1997 " digital self-indicating scale " vertification regulation is: 1. are standard test weights, 2. are standard test weight and " substitute of standard test weight ".Be standard test weight or standard test weight and substitute thereof so examine and determine the employed standard of fixed electronic scale at present in China, do not adopt auxiliary calibrating installation not examine and determine fixed weighing apparatus as standard.In R76 " non-automatic weighing apparatus " international recommendation and GB7723-2008 " fixed electronic scale " national standard, auxiliary calibrating installation is only made following provisions: if weighing apparatus is equipped with auxiliary calibrating installation, or during with the calibrating of independent servicing unit, then the limits of error of this device should be 1/3 of the load limits of error of examining." auxiliary calibrating installation " is a kind of which type of thing, all do not say in international recommendation and GB7723-2008 standard, only stipulated " auxiliary calibrating installation " limits of error.Up to the present, seldom see about the documents and materials that adopt " independently auxiliary calibrating installation " to apply to the fixed electronic scale of on-site proving large-tonnage in the world.

The China Patent No. in open day on February 17th, 1988 is CN86105843, its patent name is the calibrating installation that the patent of invention of " calibrating installation of truck scale and track scale " has disclosed a kind of non-counterweight type, but the accurate manometric accuracy that this device adopts may not satisfied the accuracy requirement of such weighing instrument verification.The China Patent No. in January 22 2003 day for announcing is CN02230837.7, its patent name also discloses a kind of weighing instrument verification instrument of non-counterweight type for the novel patent of " large-scale weighing machine calibrating instrument ", concrete technical scheme is by calibrating sensor (4), Displaying Meter (7), device for exerting, pressurizing frame (3) is formed, pressurizing frame becomes integral body with the base that needs calibrating weighing apparatus, device for exerting is fixed on the pressurizing frame, the accuracy of measuring of calibrating sensor and Displaying Meter is greater than the weighing apparatus accuracy of measuring of being examined and determine, the calibrating sensor places on the scale body (9) that needs calibrating weighing apparatus, is connected by spheroid between calibrating sensor and the device for exerting, the output of examining and determine sensor is connected with Displaying Meter.The pressure of device for exerting is applied on the sensor, show by Displaying Meter, this pressure is applied on the scale body that needs calibrating weighing apparatus simultaneously, show by the weighing apparatus instrument, compare their displayed value, can determine to be examined and determine the error in dipping of weighing apparatus, but this calibrating installation can only examine and determine one by one the use sensor in the weighing apparatus, this calibrating installation is actually superposing type force standard machine.But device for exerting, pressurizing frame are manual loading in this device, can't satisfy in JJG734-2001 " force standard machines " vertification regulation and JJG144-2007 " standard dynamometer " vertification regulation requirement to load fluctuation (power source degree of stability), force value stabilization retention time.The calibrating range only is to use each sensor load value in the weighing apparatus, not that the full scale of weighing apparatus is examined and determine, because the accuracy of measurement of weighing apparatus is not only relevant with the accuracy of each sensor, but also relevant with rigidity, the basis of weighing platform, the accuracy of instrument, the terminal box of weighing platform.That is to say that the sensor that uses in the weighing apparatus is qualified, the metering performance of weighing apparatus is not necessarily qualified.So be not that the weighing apparatus metering performance is examined and determine comprehensively, also need to consider in addition the accuracy, terminal box of basis, the instrument of amount of deflection, the weighing platform of weighing platform table top to the influence of weighing apparatus accuracy in the verification process, because can only examine and determine at the sensor place, so verification process can not be simulated the actual state of weighing, so the simulation comparison that this calibrating installation only is similar to the sensor that uses in the weighing apparatus the calibrating of weighing apparatus, most critical be directly to implement calibrating to weighing apparatus.

At present, the whole nation is as follows to the calibration method of fixed electronic scale: be the example explanation to examine and determine 100 tons of fixed electronic vehicle weighing apparatus, according to GB7723-2008 " fixed electronic scale " national standard or JJG539-1997 " digital self-indicating scale " vertification regulation requirement, adopt standard test weight and " substitute of standard test weight " to examine and determine.Wherein, as shown in Figure 1, need to prove that specification is 100 tons fixed electronic vehicle weighing apparatus 2 ', totally 18 meters long at three joints, e=50kg, m=2000, comprise scale Displaying Meter 21 ', comprise three weighing platform table tops, be numbered 211 ', 212 ', 213 ' respectively, adopt eight sensors, be numbered 231 '-238 ' respectively, above each sensor, comprise eight sensor supporting-points, be numbered 241 '-248 ' respectively, divide the unbalance loading test zone of a correspondence around each sensor supporting-point, shown in frame of broken lines among Fig. 1, be numbered 251 '-258 ' respectively, during calibrating, the substitute 3 ' of standard test weight or standard test weight is placed on each above-mentioned unbalance loading test zone carries out the unbalance loading test one by one, concrete metering performance verification process is as follows:

1, precompressed: should add a load in advance to 100t, or be no less than 3 times by carrier with the load-carrying vehicle that is no less than 50t is round;

2, zero setting and except the accuracy of instrument;

3, load preceding zero setting;

4, weighing performance:

4.1 for the required at least standard test weight amount of affirmation scale is carried out reperformance test when adopting the calibrating of standard test weight and substitute: the repeatability that at first checks the 50t weighing point, apply the 50t standard test weight 3 times at carrier, if reproducibility error is not more than 0.3e, standard test weight 3 ' can be reduced to 35% maximum weighing; If reproducibility error is not more than 0.2e, standard test weight 3 ' can be reduced to 20% maximum weighing;

4.2 weighing test: add counterweight or substitute 3 ' to 100t from zero point by ascending order, unload counterweight to zero point with same procedure, test should be selected 1t, 25t, 50t, 75t, five calibratings of 100t point at least;

4.3 allowance for bark weighing test: tackle 2 different tare weight amounts at least and allowance for bark the weighing test, carry out according to 4.2, test point is: 1t, 50t, the weighing that the limits of error change, possible five calibratings of maximum net weight value, 75t point;

4.4 unbalance loading test: add in turn with the standard test weight 3 ' of 15t and to be placed on 8 unbalance loading test zones 251 '-258 ' and to test, test 251 '-258 ' the error of indication at 8 unbalance loading test zones and all be not more than 25kg until satisfying;

4.5 resolving ability test: in 1t, 50t, the test of 100t weighing point, carry out simultaneously in the verification process;

4.6 reperformance test: at 50t weighing and carry out two groups of tests near maximum weighing (90t), every group is repeated 3 times at least respectively.

In above-mentioned verification process, need the tonnage amount of carrying counterweight or substitute: 1, need carrying 100t in the above-mentioned precompressed process; It is validation criteria counterweight amount and scale is carried out reperformance test need carry 150t when 2, adopting standard test weight and substitute calibrating in above-mentioned 4.1; 3, the weighing test needs carrying 100t in above-mentioned 4.2; 4, allowance for bark the weighing test in above-mentioned 4.3 and need carrying 200t; 5, the unbalance loading test needs carrying 120t in above-mentioned 4.4; 6. reperformance test need be carried 420t in above-mentioned 4.6.

So there is following shortcoming in the calibration method that adopts standard test weight or standard test weight and substitute to examine and determine fixed electronic scale:

1, calibration operation amount is huge, efficient is extremely low.Examine and determine that a fixed electronic vehicle weighing apparatus of qualified 100t need be moved counterweight altogether and substitute reaches 940t, if defectively just should adjust, must examine and determine again after the adjustment, calibrating must be carried counterweight again again, and it carries counterweight or substitute reaches more than the kiloton;

2, the security extreme difference of a large amount of counterweights of carrying or substitute.Because the loading floor area limited (as 100 tons, footprint also has only 54 square metres) of electronic vehicle weighing apparatus will be very difficult at counterweight or the substitute of 100 tons of limited area stackings, is danger close when loading and unloading counterweight or substitute;

3, substitute is difficult to seek.The user who is not every large-scale electronic vehicle weighing apparatus can both provide suitable substitute, as is installed in users such as the other standard scale of highway just is difficult to find suitable substitute, harbour, venom is arranged, gas chemical enterprise, textile mills, colliery and also is difficult to the substitute that provides suitable;

4, standard test weight is difficult to transportation.Examine and determine 100 tons of truck scales, will transport 50 tons of standard test weights at least; Examine and determine 150 tons of truck scales, will transport 75 tons of standard test weights at least.Also can only about 15 tons and transport counterweight at present at home, particularly there are unsafe bridge limit for tonnage, road limit for tonnage, landform limit for tonnage in the area, mountain area, is installed in the gully (as mine) etc. and will limits the counterweight freight volume No. one time;

5, cost is high.Transportation and carry so many standard test weight or substitute needs multi-section weigh bridge test car and crane, and calibrating needs several days time, and (examine and determine 100 tons of truck scales generally need 7 working days) and multi agent cooperation just can be finished calibration operation.

In sum, since at present most of at county level, city-level, calibrating does not have enough standard test weights to large-scale weighing machine (as 150 tons of electronic vehicle weighing apparatus) in provincial measurement verification unit; Even enough standard test weights have been arranged, security, the transportation cost of its counterweight loading and unloading, transportation counterweight also are to guarantee in existing technical conditions; Secondly, just be that counterweight is transported to the scene, if by stipulating to examine and determine in JJG539-1997 " digital self-indicating scale " vertification regulation, its calibration operation amount is huge, examines and determine consuming time longly, thereby can't guarantee to be undertaken by vertification regulation.This shows, when examining and determine large-scale fixed electronic scale, standard adopt the calibration method of standard test weight or standard test weight and substitute be need improved.

[summary of the invention]

The technical problem to be solved in the present invention be to be provided for examining and determine large-scale weighing machine self-location loading-unloading measuring device, can increase work efficiency greatly and security, saving cost by adopting this self-location loading-unloading measuring device to be applied to implement in the verification system calibrating, variety of issues such as it is huge to solve the calibration operation amount that exists when available technology adopting standard test weight or standard test weight and substitute or other non-counterweight type weighing instrument verification device are examined and determine fixed electronic scale, and calibrating takes time and effort, verification process is loaded down with trivial details, accuracy is not enough.

The technical scheme that the technical matters that the present invention solves adopts is as described below:

The self-location loading-unloading measuring device that is used for the calibrating large-scale weighing machine, wherein, described self-location loading-unloading measuring device comprises that a substitute that can be used for alternate standard counterweight or standard test weight adds the self-align loading and unloading body of unloading and the high precision Load Meter that the described loading and unloading body of next-door neighbour upper end arranges to the weighing platform table top, and the accuracy of described high precision Load Meter is at least 3 times of accuracy of described weighing apparatus.

Further, described self-location loading-unloading measuring device along one pass that a weighing platform hole on the weighing platform table top that is preset in described weighing apparatus is connected with the weighing platform ground and the pulling force framework that arranges perpendicular to described weighing platform table top around arrange.

Further, described high precision Load Meter comprises that locating part and that at least three standard transducers of evenly laying around the central axis of described pulling force framework, are located at the top of described high precision Load Meter is connected with described each standard transducer and is used for showing the standard transducer measurement Displaying Meter of the power value load of described standard transducer.

Further, described loading and unloading body comprises a master cylinder and a self-align bearing plate, described master cylinder comprises the oil cylinder part that is positioned at the outside and is positioned at inboard piston portion, the lower end that described piston portion is close to described standard transducer arranges, and described self-align bearing plate is arranged on the weighing platform table top of described weighing apparatus and is set on the described pulling force framework and is positioned at the below of described master cylinder.

Further, described self-align bearing plate comprise one with described oil cylinder partly keep at a certain distance away the bearing plate plate body that arranges and at least three be used for regulating automatically the pressure-bearing direction make described standard transducer be subjected to mechanical axis and described stayed mast main body be subjected to the parallel multi-directional ball bearing of mechanical axis, described multi-directional ball neck collar is evenly laid on the upper surface that is embedded in described bearing plate plate body and the upper part of exposing described multi-directional ball bearing partly just contacts with the oil cylinder of described master cylinder around the central axis of described pulling force framework.

The invention has the advantages that by adopting this self-location loading-unloading measuring device to be used for a kind of system of examining and determine large-scale weighing machine and implement calibrating, can increase work efficiency with security greatly, save cost, variety of issues such as it is huge to solve the calibration operation amount that exists when available technology adopting standard test weight or standard test weight and substitute or other non-counterweight type weighing instrument verification device are examined and determine fixed electronic scale, and calibrating takes time and effort, verification process is loaded down with trivial details, accuracy is not enough.

[description of drawings]

The present invention is further illustrated in conjunction with specific embodiments with reference to the accompanying drawings.

Fig. 1 is the synoptic diagram of available technology adopting standard test weight or standard test weight and substitute calibrating weighing apparatus.

Fig. 2 is the cut-open view of verification system of the present invention.

Fig. 3 is the cut-open view of self-location loading-unloading measuring device of the present invention.

Fig. 4 is the cut-open view of verification system of the present invention.

Fig. 5 a is the cut-open view of standard transducer of the present invention.

Fig. 5 b is the A-A cut-open view of the standard transducer among Fig. 5 a.

Fig. 6 is the cut-open view of the position relation of loading and unloading body of the present invention and high precision Load Meter.

Fig. 7 a is the cut-open view of self-align bearing plate of the present invention.

Fig. 7 b is the vertical view of the self-align bearing plate among Fig. 7 a.

Fig. 8 is the inside and outside annexation figure that verification system of the present invention is installed.

Fig. 9 a is the synoptic diagram that adopts verification system calibrating weighing apparatus of the present invention.

Fig. 9 b is the synoptic diagram that adopts verification system calibrating weighing apparatus of the present invention.

[embodiment]

Please consult Fig. 2 by emphasis, Fig. 3, Fig. 4 and shown in Figure 8, the present invention is used for the self-location loading-unloading measuring device of calibrating large-scale weighing machine, it is the system of examining and determine large-scale weighing machine for a kind of, large-scale weighing machine is examined and determine, described verification system 1 is a kind of independently verification system of auxiliary weighing apparatus of non-counterweight type, can be used for large-scale fixed electronic scale 2 (is seen that Fig. 9 a) carries out measurement verification, comprise: at least four pulling force frameworks 11, at least four self-location loading-unloading measuring devices 12 and a constant load control device 13, the number of described pulling force framework 11 is consistent with the number of described self-location loading-unloading measuring device 12, and correspondence is set together one by one, and each described pulling force framework 11 passes that a weighing platform hole 211 on the weighing platform table top 21 that is preset in described weighing apparatus 2 is connected with weighing platform ground 3 and arranges perpendicular to described weighing platform table top 21; Each described self-location loading-unloading measuring device 12 adds unloading and carries out load measurement weighing platform table top 21 along the substitute that is provided for alternate standard counterweight or standard test weight all around of each described pulling force framework 11, each described self-location loading-unloading measuring device 12 comprise one can be self-align loading and unloading body 121 and a high precision Load Meter 122, the upper end of the described loading and unloading body 121 of described high precision Load Meter 122 next-door neighbours arranges, be to guarantee accuracy and the traceability of calibrating, the accuracy of described high precision Load Meter 122 is at least 3 times of accuracy of described weighing apparatus.Described constant load control device 13 is connected with described loading and unloading body 121 and to keep institute to add load when being used for making described loading and unloading body 121 to load constant.

Please consult shown in Figure 3 by emphasis, described high precision Load Meter 122 comprises at least one standard transducer 1221, standard transducer measurement Displaying Meter 1222 (see figure 8)s and a locating part 1223, described locating part 1223 is arranged on the top of described standard transducer 1221, for detachable, can be used for limiting and regulating the position of described standard transducer 1221, in the present embodiment, described locating part 1223 is born by a nut that is arranged on the described pulling force framework 11, and described nut can be used for locking spacing; Described standard transducer is measured that Displaying Meter 1222 is connected with described standard transducer 1221 and is used for the power value load of the described standard transducer 1221 of demonstration.

Please emphasis consult shown in Figure 4ly, described pulling force framework 11 comprises a lower margin stayed mast 111, a stayed mast main body 112, a pressure-bearing pad 113, a thrust articulated bearing 114, a self-adjusting right alignment mechanism 115 and a height adjusting yoke 116.Be lower margin stayed mast 111 shown in Fig. 4, described lower margin stayed mast 111 is embedded in the depths of described weighing platform ground and fixedlys connected with described stayed mast main body 112; Described pressure-bearing pad 113 is close to the lower end of described locating parts 1223 (being nut) and is set on the described stayed mast main body 112; The lower end of the described pressure-bearing pad 113 of described thrust articulated bearing 114 next-door neighbours also is set on the described stayed mast main body 112; Described self-adjusting right alignment mechanism 115 is arranged between described stayed mast main body 112 and the described lower margin stayed mast 111, can be used for adjusting automatically the right alignment of described stayed mast main body 112 and described standard transducer 1221 (see figure 3)s, can make described stayed mast main body 112 keep coaxial and perpendicular to described weighing platform table top 21, particularly, described self-adjusting right alignment mechanism 115 bears to realize the adjustment of right alignment by a rod end thrust bearing; Described height adjusting yoke 116 is arranged on the lower end of described stayed mast main body 112, refer to that particularly stayed mast main body 112 is positioned at the lower end of described weighing platform table top below 21, described height adjusting yoke 116 can be regulated the required height of pulling force framework 11 easily according to the weighing platform table top 21 in calibrating place and the height of weighing platform ground 3.

Please consult shown in Fig. 5 a and Fig. 5 b by emphasis, described high precision Load Meter 122 comprises at least three standard transducers 1221, described each standard transducer 1221 is evenly laid around the central axis of described pulling force framework 11, described standard transducer is measured the power value load of making a concerted effort that Displaying Meter 1222 (see figure 3)s are connected with described each standard transducer 1221 and are used for showing described each standard transducer 1221, described standard transducer 1221 comprises upper bed-plate 12211, lower bottom base 12212 and be located at elastic body 12213 between the Up/down base, the lower end of described thrust articulated bearing 114 (see figure 4)s of described upper bed-plate 12211 next-door neighbours arranges.Described high precision Load Meter 122 also comprises one with the housing 1224 of described standard transducer 1221 in being wrapped in, and is located at the handrail 1225 that is convenient to operation on the described housing 1224.

Please emphasis consult shown in Figure 6ly, described loading and unloading body 121 comprises a self-align bearing plate 1211 and a master cylinder 1212.Described master cylinder 1212 comprises the oil cylinder part 12121 that is positioned at the outside and is positioned at inboard piston portion 12122, the lower bottom base 12212 of the described standard transducer 1221 of described piston portion 12122 next-door neighbours arranges, described piston portion 12122 moves upward when acting, can make described standard transducer 1221 stressed; Described loading and unloading body 121 comprises that also one is arranged on described weighing apparatus 2 and (sees that a) weighing platform table top 21 of figure Fig. 9 (sees that Fig. 9 a) goes up and be set in self-align bearing plate 1211 on the described pulling force framework 11, described self-align bearing plate 1211 is arranged on the below of described master cylinder 1212, when oil cylinder part 12121 moves downward acting, described self-align bearing plate 1211 is stressed, thereby makes weighing platform table top 21 stressed.Because described self-align bearing plate 1211 has certain area coverage, thus near the weighing platform hole 211 a part of area can be covered, thus can simulate the state of truly weighing of described weighing apparatus 2, realize the more measurement verification of science.

Please consult shown in Fig. 6, Fig. 7 a and the 7b by emphasis, described self-align bearing plate 1211 comprise a bearing plate plate body 12111 and with at least three multi-directional ball bearings 12112.The setting that keeps at a certain distance away of described bearing plate plate body 12111 and described oil cylinder part 12121; In the present embodiment, described multi-directional ball bearing 12112 is 6, described multi-directional ball bearing 12112 is evenly laid on the upper surface that is embedded in described bearing plate plate body 12111 around the central axis of described stayed mast main body 112 and the upper part of exposing described multi-directional ball bearing 12112 just contacts with the oil cylinder part 12121 of described master cylinder 1212, described bearing plate plate body 12111 and being arranged between the described oil cylinder part 12121 on top except with each multi-directional ball bearing 12112 contacts, there is certain space in other place, described multi-directional ball bearing 12112 be used for regulating automatically the pressure-bearing direction make described standard transducer 1221 be subjected to mechanical axis and described stayed mast main body 112 be subjected to mechanical axis parallel.The outside of described master cylinder 1212 also is provided with a screw 12123 that can carry out horizontal adjustment, the upper surface of described bearing plate plate body 12111 is withstood on the top of described screw 12123, can be used for adjusting the location and make described master cylinder 1212 be in horizontality on the whole, use in back, location, position to guarantee described master cylinder 1212.

Please consult Fig. 2, shown in Figure 8 by emphasis, described constant load control device 13 comprises the computing machine 133 of oil sources mechanism 131, constant load control gear 132, band constant load control software.Described oil sources mechanism 131 comprises first servomotor 1311, second servomotor 1312, first servo oil pump 1313, second servo oil pump 1314, the input end of described first servomotor 1311 and second servomotor 1312 all is connected with described computing machine 133, the output terminal of described first servomotor 1311 is connected with the input end of described first servo oil pump 1313, and the output terminal of described second servomotor 1312 is connected with the input end of described second servo oil pump 1314; Described constant load control gear 132 comprises a surplus valve 1321, one reversal valve 1322 and an electric check valve 1323, described surplus valve 1321 is used for regulating flow or overload protection, described reversal valve 1322 is used for oil-feed or the oil return of control master cylinder, described electric check valve 1323 is used for the action of control master cylinder 1212, the input end of described reversal valve is connected with the output terminal of described first servo oil pump 1313 and second servo oil pump 1314, described reversal valve also is connected with described surplus valve 1321, the output terminal of described reversal valve also with after described electric check valve 1323 is connected is connected with described master cylinder 1212 again, perhaps, the output terminal of described reversal valve directly is connected with described master cylinder 1212; Described at least three standard transducers 1221 are measured Displaying Meter 1222 with described standard transducer and are connected, described standard transducer is measured Displaying Meter 1222 and is connected with described computing machine 133, each sensor 231-234 of described weighing apparatus is connected with the scale Displaying Meter 22 of described weighing apparatus, and the scale Displaying Meter 22 of described weighing apparatus is connected with described computing machine 133 again.

Please in conjunction with Fig. 2-Fig. 4, Fig. 5 a, Fig. 5 b, Fig. 6, Fig. 7 a, Fig. 7 b, shown in Figure 8, the principle of work of the various piece of a kind of system of examining and determine large-scale weighing machine of the present invention is as follows:

Pulling force framework 11: pulling force framework 11 is adjusted the right alignment of stayed mast main body 112 and standard transducer 1221 automatically by the self-adjusting right alignment mechanism 115 on the stayed mast main body 112, make both central axis parallel, and adjust to both all perpendicular to the weighing platform table top 21 of the weighing apparatus 2 of required calibrating; Pulling force framework 11 is adjusted stressed verticality and the verticality of standard transducer 1221 axis by the thrust articulated bearing 114 on the stayed mast main body 112, and the own axis of the stressed axis that guarantees standard transducer 1221 and standard transducer 1221 is consistent.Pulling force framework 11 also comprises height adjusting yoke 116, can regulate the required height of pulling force framework 11 easily according to the weighing platform table top 21 in calibrating place and the height of weighing platform ground 3.The tension intensity of frame part can reach 300kN.

Self-location loading-unloading measuring device 12: when large-scale weighing machine 2 is examined and determine, owing to can't guarantee to be installed in the stressed right alignment of the standard transducer 1221 of the high precision Load Meter 122 on the weighing platform table top 21, so need the self-align bearing plate 1211 of design adjust automatically standard transducer 1221 stressed axially with the standard transducer 1221 of the stressed axial parallel and allowable offset load of stayed mast main body 112, could satisfy the needs of detection.The standard transducer 1221 of allowable offset load is standard transducer 1221 uniform being installed between upper bed-plate 12211 and the lower bottom base 12212 that can gather the power value by three, and three standard transducer 1221 output sensitivity unanimities, thereby when guaranteeing that standard transducer 1221 bears eccentric load, output and the directly proportional electric signal of gravimetric value make the load of making a concerted effort constant.When standard transducer 1221 is stressed, elastic body 12213 distortion of standard transducer 1221, be attached at the foil gauge bridge circuit out of trim on the elastic body 12213, output and the directly proportional electric signal of gravimetric value, through linear amplifier signal is amplified, be converted to digital signal through A/D again, measured the microprocessor of Displaying Meter 1222 by standard transducer signal is handled directly demonstration gravimetric value of back.Self-align bearing plate 1211 is made up of bearing plate main body 12111 and multi-directional ball bearing 12112, and the standard transducer 1221 of high precision Load Meter 122 stressed axially and during stayed mast main body 112 stressed axial not parallel worked as F _XDuring＞1kgf, loading and unloading body 121 and high precision Load Meter 122 are under the effect of multi-directional ball bearing 12112, loading and unloading body 121 and standard transducer 1221 can be regulated its position automatically, make the standard transducer 1221 stressed axial and stressed axially parallels of stayed mast.The lower bottom base setting of the described standard transducer 1221 of described piston portion 12122 next-door neighbours, when described piston portion 12122 moves upward acting, because be subjected to the alignment restrictions of described locating part 1223, can make described standard transducer 1221 stressed, described self-align bearing plate 1211 is arranged on the below of described master cylinder 1212, the reacting force of described piston portion 12122 and oil cylinder part 12121 between mutually makes oil cylinder part 12121 move downward acting, at this moment, described self-align bearing plate 1211 is stressed, thereby makes weighing platform table top 21 stressed.In brief, after the calibrating beginning, 121 pairs of high precision Load Meters 122 of loading and unloading body and self-align bearing plate 1211 load, make high precision Load Meter 122 and 1211 while of self-align bearing plate holding capacity be worth equal-sized load, because self-align bearing plate 1211 is placed on the weighing platform table top 21 of weighing apparatus 2 such as truck scale, make truck scale weighing platform table top 21 be subjected to downward power value load (gravimetric value that is equivalent to goods), by the scale instrument display 22 demonstration gravimetric values of truck scale; High precision Load Meter 122 is demarcated by force standard machines (not shown) fixed point, and its indicating value is true value.Than the difference of the displayed value of the scale instrument display 22 of the displayed value of degree of precision Load Meter 122 and truck scale, be the error amount of weighing apparatus 2.Described self-location loading-unloading measuring device 12 as shown in Figure 2, the mass measurement accuracy is better than 0.01%, repeatability is better than 0.01%, self-align position accuracy is better than

Constant load control device 13: constant load control device 13 can reach following index: response limit: load fluctuation 0.01%, (power source degree of stability): 0.005%/30min, every grade add discharge time＜30s, force value stabilization retention time and are better than 1 hour.

As shown in Figure 8, be that example illustrates the annexation figure that verification system of the present invention is installed with the automobile weighing apparatus 2 that only comprises 4 sensor 231-234 below, described weighing apparatus comprises a joint weighing platform table top 21, a scale Displaying Meter 22, and each sensor 231-234 all is connected to described scale Displaying Meter 22.During installation, need near around the weighing apparatus, weighing platform hole 251-254 be installed, and weighing platform hole 255 is installed at the center of described weighing platform table top 21, the position in described weighing platform hole 251 is equipped with pulling force framework 11-1 and self-location loading-unloading measuring device 12-1, described self-location loading-unloading measuring device 12-1 comprises standard transducer 1221-1, master cylinder 1212-1, in like manner, pulling force framework 11-2 and self-location loading-unloading measuring device 12-2 are installed on the weighing platform hole 252, the self-location loading-unloading measuring device that install in other weighing platform hole does not show fully that in Fig. 9 described self-location loading-unloading measuring device 12-2 comprises standard transducer 1221-2, master cylinder 1212-2.Described standard transducer 1221-1,1221-2 are connected to described standard transducer and measure Displaying Meter 1222, described standard transducer 1221-3,1221-4,1221-5 also all are connected to described standard transducer and measure Displaying Meter 1222, described master cylinder 1212-1,1212-2 are connected to the electric check valve 1323 in the described constant load control device 13, and master cylinder 1212-3,1212-4, the 1212-5 of the self-location loading-unloading measuring device that install in other weighing platform hole also all are connected to described electric check valve 1323.Share a standard transducer in described each self-location loading-unloading measuring device and measure Displaying Meter 1222, can show the standard value of each weighing point simultaneously.

The control principle of work of verification system of the present invention is as follows:

Please specifically consult Fig. 8, described computing machine 133 is according to the needs to the truck scale calibrating, and 1323 controls of control electric check valve are single or control a plurality of self-location loading-unloading measuring devices simultaneously, thereby realize weighing value single-point or the multiple spot of truck scale are detected automatically.As self-location loading-unloading measuring device 12-1 is illustrated control procedure: begin test after setting the control mass value, electric check valve 1323 is opened the oil circuit that is connected to described master cylinder 1212-1, and all the other end.Computing machine 133 is measured the actual signal that Displaying Meter 1222 is gathered standard transducer 1221-1 by standard transducer, because what adopt is equally distributed three standard transducers, be the value of making a concerted effort (namely value is the realistic objective mass value with joint efforts) of three standard transducers 1221 so actual signal herein is actual, by computing, to first servomotor 1311, second servomotor, 1312 transmission speeds, torque instruction, the rotating speed of first servomotor, 1311 controls, first servo oil pump 1313, torque, by 1322 couples of master cylinder 1212-1 of reversal valve oil-feed, the rotating speed of second servomotor, 1312 controls, second servo oil pump 1314, torque is by 1322 couples of master cylinder 1212-1 of reversal valve oil return; The speed discrepancy of first servo oil pump 1313 and second servo oil pump 1314 determines advance and retreat, pressure, the speed of master cylinder 1212-1.Master cylinder 1212-1 measures Displaying Meter 1222, standard transducer 1221-1 by standard transducer and sends signal to computing machine 133 in real time, computing machine 133 in real time by computing to first servomotor 1311, second servomotor, 1312 transmission speeds, torque instruction, so form a closed-loop control; Reach the mass value of setting up to the value of making a concerted effort of standard transducer 1221-1, this moment, the truck scale display was that the displayed value of scale Displaying Meter 22 and the difference of standard transducer measurement instrument 1222 displayed values are the error that weighing apparatus is controlled mass value.In actual verification process, pulling force framework 11 and self-location loading-unloading measuring device 12 are installed near each weighing apparatus supporting-point, utilize constant load control device 13, can carry out precompressed to weighing apparatus 2 respectively by regulation in GB7723-2008 " fixed electronic scale " national standard and JJG539-1997 " digital self-indicating scale " vertification regulation by the software that is installed on the computing machine 133, the weighing test, the resolving ability test, allowance for bark the weighing test, the unbalance loading test, metering performances such as reperformance test are tested and are checked, when carrying out projects test and checking, compare the value of the weighing sum of each self-location loading-unloading measuring device 12 and the scale instrument display 22 value difference values of the weighing apparatus of examining, be the gauging error value of weighing apparatus 2.The 1 pair of truck scale of verification system of the present invention calibrating state and the automobile state consistency of weighing, the validity and the reliability that guarantee to examine and determine the electronic vehicle weighing apparatus result.Though the calibrating with truck scale is that example describes, verification system 1 of the present invention is not limited in the calibrating of truck scale, can be used for the calibrating of the large-scale fixed electronic scale of various uses and mechanism.

Concrete installation and the calibration method of a kind of system of examining and determine large-scale weighing machine of the present invention are as follows:

Shown in Fig. 9 a and Fig. 9 b, with of the prior art shown in Figure 1ly different be, when a kind of system of examining and determine large-scale fixed electronic scale that adopts the present invention to realize comes weighing apparatus 2 examined and determine, not to adopt standard test weight or standard test weight and substitute, but second kind of standard of definition realized calibrating in adopting international standards, shown in Fig. 9 a is fixed electronic scale 2, comprise weighing platform table top 21, scale Displaying Meter 22, be that 100 tons fixed electronic vehicle weighing apparatus is example with specification, weighing platform table top 21 is divided into three joint table tops, be numbered 211 respectively, 212,213, this truck scale has adopted eight sensors altogether, be numbered 231-238 respectively, above each sensor 231-238, comprise eight sensor supporting-points, be numbered 241-248 respectively, during calibrating, making a call to eight weighing platform hole 251-258 respectively near on the weighing platform table top of eight sensor supporting-point 241-248, also need make a call to a weighing platform hole 259 respectively at the center of three weighing platform table top 211-213, also have on the weighing platform table top 21 of some weighing apparatus and be reserved with a plurality of weighing platforms hole, pre-buried lower margin pulling force ring on the basis of the 259 times scales in platform hole, coming the installation code device by above-mentioned each hole then is that pulling force framework of the present invention and self-location loading-unloading measuring device 12 are implemented calibration operation under the control of constant load control device.As shown in Fig. 9 b, eight pulling force frameworks 11 of the present invention have been installed simultaneously and have been measured loading-unloading measuring device 12 certainly on eight weighing platform hole 251-258 on the weighing platform table top 21, described pulling force framework 11 is connected on the lower margin pulling force ring 111, at this moment, the constant load control device is one only still, controls each from the action of measuring loading-unloading measuring device 12.

See also shown in Fig. 9 a and Fig. 9 b, the calibrating operating process of verification system of the present invention is as follows:

1, independently auxiliary weighing instrument verification device of non-counterweight is installed: near position, table top hole (groove) each sensor of weighing platform, with the middle table top of each table top pulling force framework and self-location loading-unloading measuring device are installed, are formed by pulling force framework connecting hole (groove) below stayed mast (ring) and self-location loading-unloading measuring device the weighing platform table top is added the unloading measuring system.

2, zero clearing: unclamp the nut that screws tight on the pulling force frame, make not stand under load of weighing platform, to the zero clearing of two measuring system instrument.

3, precompressed: adjust the nut that spiral shell is established on the pulling force frame, each self-location loading-unloading measuring device is loaded 200kg, stablize after 30 seconds that (loading and unloading body and standard transducer are regulated its position automatically under the effect of multi-directional ball bearing, make standard transducer stressed axially and the stressed axially parallel of stayed mast.The pulling force framework is adjusted the right alignment of stayed mast and standard transducer automatically by thrust articulated bearing on the stayed mast and spherical plain bearing rod end), each self-location loading-unloading measuring device is loaded on the weighing platform full scale once.

4, zero setting and except the accuracy of instrument with the calibrating of zero setting before loading: with the counterweight of 10 1kg counterweights and 10 200g to scale carry out zero setting with except the accuracy of instrument with load the calibrating of preceding zero setting.

5, unbalance loading test: control constant load control device respectively by number order to each self-location loading-unloading measuring device imposed load to the unbalance loading value, each imposed load is protected lotus 30s to the unbalance loading value, record the instrument weighing displayed value of each self-location loading-unloading measuring device instrument displayed value, weighing apparatus, and compare.

6, weighing test: control constant load control device is stipulated imposed load by rules step by step to each self-location loading-unloading measuring device (except the self-location loading-unloading measuring device in the middle of each table top) simultaneously, be offloaded to zero point step by step by the opposite point of load behind the imposed load, each imposed load or be offloaded to load value after protect lotus 30s, record every each self-location loading-unloading measuring device at the total value of Displaying Meter, the instrument weighing displayed value of weighing apparatus, and compare.

7, allowance for bark the weighing test: 1. at first the self-location loading-unloading measuring device in the middle of each table top of weighing platform applies predetermined tare weight value, after removing tare weight, simultaneously each self-location loading-unloading measuring device (the self-location loading-unloading measuring device load in the middle of each table top is constant) is stipulated the imposed load value by rules step by step by control constant load control device, be offloaded to zero point step by step by the opposite point of load behind the imposed load, each imposed load or be offloaded to load value after protect lotus 30s, record every each self-location loading-unloading measuring device instrument displayed value total value, the instrument weighing displayed value of weighing apparatus, and compare.2. the self-location loading-unloading measuring device in the middle of each table top of weighing platform applies different predetermined tare weight values again, after removing tare weight, repeat above step, record the instrument weighing displayed value of every each self-location loading-unloading measuring device instrument displayed value total value, weighing apparatus, and compare.

8, reperformance test: control constant load control device simultaneously to each self-location loading-unloading measuring device (except the self-location loading-unloading measuring device in the middle of each table top) step by step the imposed load value be rules specified load value, be offloaded to zero point behind the imposed load, protect lotus 30s after being applied to load value at every turn, record the instrument weighing displayed value of each every each self-location loading-unloading measuring device instrument displayed value total value weighing apparatus, and compare the above step of triplicate.

9, according to verification result, judge whether to need to adjust the weighing accuracy of truck scale, if need to adjust, repeat above verification step, till meeting vertification regulation.

Though the calibrating with truck scale is that example describes, calibrating installation of the present invention is not limited in the calibrating of truck scale, can be used for the calibrating of the large-scale fixed electronic scale of various uses and structure.

The present invention can also have other embodiment, and the technical scheme that the equal replacement of all employings or equivalent transformation form all drops within the scope of protection of present invention.

Claims (3)

1. self-location loading-unloading measuring device that is used for the calibrating large-scale weighing machine, it is characterized in that: described self-location loading-unloading measuring device comprises that a substitute that is used for alternate standard counterweight or standard test weight adds the self-align loading and unloading body of unloading and the high precision Load Meter that the described loading and unloading body of next-door neighbour upper end arranges to the weighing platform table top, and the accuracy of described high precision Load Meter is at least 3 times of accuracy of described weighing apparatus;

Described self-location loading-unloading measuring device along one pass that platform hole on the weighing platform table top that is preset in described weighing apparatus is connected with the weighing platform ground and the pulling force framework that arranges perpendicular to described weighing platform table top around arrange;

Described high precision Load Meter comprises that locating part and that at least three standard transducers of evenly laying around the central axis of described pulling force framework, are located at described standard transducer top is connected with described each standard transducer and is used for showing the standard transducer measurement Displaying Meter of the power value load of described standard transducer.

2. according to claim 1 for the self-location loading-unloading measuring device of examining and determine large-scale weighing machine, it is characterized in that: described loading and unloading body comprises a master cylinder and a self-align bearing plate, described master cylinder comprises the oil cylinder part that is positioned at the outside and is positioned at inboard piston portion, the lower end that described piston portion is close to described standard transducer arranges, and described self-align bearing plate is arranged on the weighing platform table top of described weighing apparatus and is set on the described pulling force framework and is positioned at the below of described master cylinder.

According to claim 2 for the calibrating large-scale weighing machine self-location loading-unloading measuring device, it is characterized in that: described self-align bearing plate comprise one with described oil cylinder partly keep at a certain distance away the bearing plate plate body that arranges and at least three be used for automatically regulating the pressure-bearing direction make described standard transducer be subjected to mechanical axis and described pulling force framework be subjected to the parallel multi-directional ball bearing of mechanical axis, described multi-directional ball bearer ring is evenly laid on the upper surface that is embedded in described bearing plate plate body and the upper part of exposing described multi-directional ball bearing partly just contacts with the oil cylinder of described master cylinder around the central axis of described pulling force framework.

Images