CN102538936A - Calibration device of large weighing apparatus - Google Patents
Calibration device of large weighing apparatus Download PDFInfo
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- CN102538936A CN102538936A CN2011104470977A CN201110447097A CN102538936A CN 102538936 A CN102538936 A CN 102538936A CN 2011104470977 A CN2011104470977 A CN 2011104470977A CN 201110447097 A CN201110447097 A CN 201110447097A CN 102538936 A CN102538936 A CN 102538936A
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Abstract
The invention provides a calibration device of a large weighing apparatus. The calibration device comprises calibration units and a base, wherein the number of the calibration unit is at least accordant with that of weighing sensors of the calibrated weighing apparatus; the base is used for supporting each calibration unit; a foundation pit used for accommodating the calibrated weighing apparatus is arranged on the base; base pre-burying boards are respectively arranged on the base which are arranged on the two sides of the foundation pit; each calibration unit comprises a substrate, a force sensor, a force applying lever, a lever supporting pedestal, a force applying oil cylinder and in the center of a ball head bearing pad which is arranged the force sensor; a bearing board is arranged on a weighing platform of the calibrated weighing apparatus; one end of the lever supporting pedestal is fixedly connected with the base pre-burying boards; the other end of the lever supporting pedestal is pivoted to the force applying lever; and one end of the force applying lever is positioned over the ball head bearing pad and is contacted with the ball head bearing pad; and the other end of the force applying lever is connected with a piston of the force applying oil cylinder through a supporting rod. The calibration device has the advantages that the working efficiency and the security of the large weighing apparatus are highly improved, the cost is saved and the structure is simple.
Description
[technical field]
The present invention relates to a kind of device of measurement verification technical field, particularly a kind of calibrating installation of large-scale weighing machine.
[background technology]
Fixed electronic scale is technological in the world at present the most ripe Weighing utensil; Belong to the measurement instrument that has a large capacity and a wide range; Be widely used in the metering of various load-carrying vehicles of metallurgy, chemical industry, railway, 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 action of gravity, 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; Convert digital signal into through A/D again, by the microprocessor of instrument signal is handled the back then and directly show the weight number.
Fixed electronic scale must be examined and determine before actual coming into operation, and confirms its class of accuracy, in addition; Large-scale weighing machine is in use for some time or after changing device; Also to examine and determine once more, confirm its class of accuracy, make it to satisfy accuracy requirement so that do corresponding adjustment.The standard that the fixed electronic scale of existing calibrating is used mainly contains three kinds; Standard No. is to have spelt out the following three kinds of calibratings that allow to adopt in the national standard (this standard adopts international recommendation OIML R76 " non-automatic weighing apparatus " (2006E)) of the fixed electronic scale of GB7723-2008 to use standard: the one, and counterweight specifically is meant standard test weight or standard quality; The 2nd, auxiliary calibrating installation is meant that specifically weighing apparatus is equipped with auxiliary calibrating installation or independently auxiliary calibrating installation; The 3rd, standard test weight is used in calibrating, specifically is meant 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, do not adopt auxiliary calibrating installation not examine and determine fixed weighing apparatus as standard in China.In R76 " non-automatic weighing apparatus " international recommendation and the fixed electronic scale national standard of GB7723-2008, 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, in international recommendation and GB7723-2008 standard, all do not say, only stipulated " auxiliary calibrating installation " limits of error.Up to the present, the whole nation or 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 Chinese patent in open day on February 17th, 1988 number 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 manometric accuracy of the standard that this device adopted possibly not satisfied the accuracy requirement of such weighing instrument verification.The Chinese patent in January 22 2003 day for announcing number is CN02230837.7; Its patent name also discloses a kind of weighing instrument verification appearance of non-counterweight type for the novel patent of " large-scale weighing machine calibrating instrument "; Concrete technical scheme is made up of calibrating sensor (4), Displaying Meter (7), device for exerting, pressurizing frame (3); Pressurizing frame becomes integral body with the base that needs calibrating weighing apparatus; Device for exerting is fixed on the pressurizing frame, and the accuracy of measuring of calibrating LOAD CELLS and Displaying Meter is greater than the weighing apparatus accuracy of measuring of being examined and determine, and the calibrating LOAD CELLS places on the scale body (9) that needs calibrating weighing apparatus; Be connected through spheroid between calibrating LOAD CELLS and the device for exerting, the output of examining and determine LOAD CELLS is connected with Displaying Meter.The pressure of device for exerting is applied on the LOAD CELLS; Show through Displaying Meter, this pressure is applied on the scale body that needs calibrating weighing apparatus simultaneously, shows through the weighing apparatus instrument; Compare their displayed value; Can confirm 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 LOAD CELLS that uses 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 " the JJG144-2007 standard dynamometer vertification regulation " requirement to load fluctuation property (power source degree of stability), force value stabilization retention time.The calibrating range is merely and uses each LOAD CELLS 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 LOAD CELLS, 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 LOAD CELLS 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 influence in the verification process to the weighing apparatus accuracy; Because can only examine and determine at the LOAD CELLS place; So verification process can not be simulated the actual state of weighing, thus the simulation comparison that this calibrating installation only is similar to the LOAD CELLS 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 following to fixed electronic scale calibration method: to examine and determine 100 tons of fixed electronic vehicle weighing apparatus is the example explanation; According to fixed electronic scale national standard of GB7723-2008 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 totally 18 meters long at fixed electronic vehicle weighing apparatus 2 ', three joints, e=50kg, m=2000; Comprise scale Displaying Meter 21 ', comprise three weighing platform table tops, be numbered 211 ' respectively; 212 ', 213 ', adopt eight LOAD CELLSs; Be numbered 231 '-238 ' respectively, above each LOAD CELLS, comprise eight LOAD CELLS supporting-points, be numbered 241 '-248 ' respectively; Divide the unbalance loading test zone of a correspondence around each LOAD CELLS 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 following:
1, precompressed: should add a load in advance to 100t, or be no less than 3 times through carrier with the load-carrying vehicle that is no less than 50t is round;
2, zero setting and the accuracy that removes instrument;
3, load preceding zero setting;
4, weighing performance:
4.1 be validation criteria counterweight amount and scale is carried out reperformance test when adopting standard test weight to examine and determine: the repeatability of at first checking the 50t weighing point with substitute; On carrier, apply the 50t standard test weight 3 times; 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, 80t point;
4.4 unbalance loading test: add in turn with the standard test weight 3 ' of 14t 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 50kg until satisfying;
4.5 resolving ability test:, carry out simultaneously in the verification process in 1t, 50t, the test of 100t weighing point;
4.6 reperformance test: carry out two groups of tests at the 50t weighing with near maximum weighing (90t) respectively, every group is repeated 3 times at least.
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 when 2, adopting standard test weight and substitute calibrating in above-mentioned 4.1 validation criteria counterweight amount and scale is carried out reperformance test need carry 150t; 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 160t; 5, the unbalance loading test needs carrying 112t in above-mentioned 4.4; 6. reperformance test need be carried 270t 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 932t, if defectively just should adjust, must examine and determine again after the adjustment, calibrating must be carried counterweight once more 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 squares) of electronic vehicle weighing apparatus, counterweight or the substitute that on limited area, stack 100 tons are very difficult, when loading and unloading counterweight or substitute, are danger closes;
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, railway, 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 (like mine) or the like 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 (examine the general need of 100 tons of truck scales 7 working days) and multi agent cooperation could accomplish calibration operation.
In sum, because at present most of at county level, city-level, calibrating does not have enough standard test weights to large-scale weighing machine (like 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 that when examining and determine large-scale fixed electronic scale, it is that needs are improved that standard adopts the calibration method of standard test weight or standard test weight and substitute.
[summary of the invention]
Technical matters to be solved by this invention is to provide a kind of calibrating installation of large-scale weighing machine simple in structure, a kind of calibrating installation of large-scale weighing machine, the work efficiency that can improve the calibrating large-scale weighing machine greatly and security, and saving cost.
The present invention solves the problems of the technologies described above through following technical scheme: a kind of calibrating installation of large-scale weighing machine; Comprise that consistent with the LOAD CELLS quantity of tested weighing apparatus at least calibrating unit and is used to support the basis of respectively examining and determine the unit; Said basis is provided with one and is used for the foundation ditch of ccontaining tested weighing apparatus, and is respectively arranged with basic embedded board on the basis of these foundation ditch both sides; Whenever this calibrating unit all comprise one be fixed in pedestal, on the basic embedded board be located at force transducer, an afterburning lever, a lever support, on the bearing plate be located on the pedestal add power cylinder, and a centering be positioned over the bulb pressure-bearing pad on the force transducer; Said bearing plate places on the weighing platform of tested weighing apparatus; One end of said lever support is fixedly connected with basic embedded board; And the other end of this lever support is articulated in afterburning lever; One end of said afterburning lever is positioned at bulb pressure-bearing pad top and contacts with this bulb pressure-bearing pad, and the other end of this reinforcing lever is connected with the piston that adds power cylinder through a support bar.
Further, the other end of said lever support is articulated in the middle part of afterburning lever.
The beneficial effect of the calibrating installation of a kind of large-scale weighing machine of the present invention is: adopt this calibrating installation that large-scale weighing machine is examined and determine; 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; Variety of issues such as calibrating takes time and effort, verification process is loaded down with trivial details, accuracy is not enough; Promptly can improve greatly calibrating work efficiency and security, and practice thrift cost; In addition, this calibrating installation has characteristic of simple structure.
[description of drawings]
Combine embodiment that the present invention is done further description 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 front view of the calibrating installation of a kind of large-scale weighing machine of the present invention when using.
Fig. 3 is the vertical view (remove basis) of the calibrating installation of a kind of large-scale weighing machine of the present invention when using.
Fig. 4 is the synoptic diagram of calibrating unit among the present invention.
Fig. 5 is the perspective view of force transducer among the present invention (removing decapsidate).
Fig. 6 is the thrust articulated bearing of force transducer among the present invention and the figure that cooperates of last bearing plate, equal pressing plate.
Fig. 7 is the fundamental diagram of the force transducer among the present invention.
[embodiment]
Please combine to consult Fig. 2 and Fig. 4; The calibrating installation 100 of a kind of large-scale weighing machine of the present invention; Comprise at least with the consistent calibrating unit 101 and of quantity of the LOAD CELLS 201 of tested weighing apparatus 200 and be used to support the basis 102 of respectively examining and determine the unit; Said basic 102 are provided with one is used for the foundation ditch 1021 of ccontaining tested weighing apparatus 200, and is respectively arranged with basic embedded board 1022 on the basis 102 of these foundation ditch 1021 both sides; Whenever this calibrating unit 101 all comprises one and is fixed in pedestal 1011, on the basic embedded board 1022 and is located at force transducer 1013, one afterburning thick stick 1014 bars, a lever support 1015, on the bearing plate 1012 and is located at and adds power cylinder 1016, an and bulb pressure-bearing pad 1017 on the pedestal 1011; Said bearing plate 1012 places on the weighing platform 202 of tested weighing apparatus 200; One end 10151 of said lever support 1015 is fixedly connected with basic embedded board 1022; And the other end 10152 of this lever support 1015 is articulated in afterburning lever 1014; One end 10141 of said afterburning lever 1014 is positioned at bulb pressure-bearing pad 1017 tops and contacts with this bulb pressure-bearing pad 1017, and the other end 10142 of this reinforcing lever 1014 is connected with the piston that adds power cylinder 1,016 10161 through a support bar 1018; Said bulb pressure-bearing pad 1017 centerings are positioned on the force transducer 1013; Particularly; The longitudinal axis of bulb pressure-bearing pad 1017 and the longitudinal axis of force transducer 1013 should satisfy the requirement of right alignment scope; Thereby make the axis basically identical of stressed axis and the force transducer 1013 of force transducer 1013 itself, and then guarantee the accuracy that force transducer 1013 is measured; In addition, it is consistent with LOAD CELLS 201 quantity of tested weighing apparatus 200 to examine and determine the quantity of unit 101 in the present embodiment.
Draw the power that adds power cylinder 1016 generations is applied to the power on the bulb pressure-bearing pad 1017 through afterburning lever 1014 size for ease fast; The other end 10152 of lever support 1015 is articulated in the middle part of afterburning lever 1014; At this moment; After oil circuit is connected, add power cylinder 1016 and impel piston 10161 to move upward, piston 10161 makes the other end 10142 of afterburning lever 1014 receive directed force F upwards through support bar 1018
1, according to lever principle, an end 10141 of afterburning lever 1014 will impose on the downward directed force F of bulb pressure block
2, and F
2Value and F
1Value equate.
Please combine to consult Fig. 2 and Fig. 3; When calibrating installation of the present invention is used; Comprise that with calibrating the automobile weighing apparatus 200 of 8 LOAD CELLSs 201 is that example is explained elaboration: automobile weighing apparatus 200 is positioned in the foundation ditch 1021; Because of all dividing the unbalance loading test zone (not shown) that a correspondence is arranged on the weighing platform 202 of each LOAD CELLS 201 top; Each unbalance loading test zone is corresponding installs a calibrating installation 100 of the present invention (as shown in Figure 3), and installs according to as shown in Figure 2, and in concrete installation process, needs bearing plate 1012 is placed on the center of unbalance loading test zone; Set the control of quality value that adds power cylinder 1016 afterwards; Then open the oil circuit that adds power cylinder 1016; Add power cylinder 1016 and impel piston 10161 to move upward, piston 10161 makes the other end 10142 of afterburning lever 1014 receive directed force F upwards through support bar 1018
1, according to lever principle, an end 10141 of afterburning lever 1014 will impose on the downward directed force F of bulb pressure block
2, make the force transducer 1013 stressed and corresponding gravimetric values of demonstration; Bearing plate 1012 bears and F simultaneously
2Power is worth equal-sized load, because bearing plate 1012 is placed on weighing platform 202 table tops of automobile weighing apparatus 200, makes automobile weighing apparatus 200 weighing platforms 202 table tops receive downward and size is similarly F
2Power value load (gravimetric value that is equivalent to goods), and through LOAD CELLS 201 demonstration gravimetric values; When the displayed value of force transducer 1013 reached the mass value that adds power cylinder 1016 settings, the difference of the gravimetric value of LOAD CELLS 201 demonstrations of automobile weighing apparatus 200 and force transducer 1013 displayed values was the measurement error value of automobile weighing apparatus 200 at this moment.
In addition, in order to have solved the problem that detection indicating value that existing force transducer causes because of bearing plate work distortion, the testee error of centralization on it easily produces deviation, force transducer 1013 of the present invention adopts structure as shown in Figure 5.
Please consult Fig. 5 in detail, force transducer 1013 comprises a display instrument (not shown), once bearing plate 1, is sensor groups that 120 ° of sensors of arranging 21 constitute 2, a bearing plate 3, on above the sensor groups 2 by three and is set up in that equal pressing plate 4 on the sensor groups 2, three are corresponding respectively to be located at above three sensors 21 and thrust articulated bearing 5 between this equal pressing plate 4 and last bearing plate 3.Said display instrument (not shown) is connected with sensor groups 2; Said sensor groups 2 places down on the bearing plate 1, and every said sensor 21 is all with following bearing plate 1, all pressing plate 4 is located by connecting.Every said sensor 21 all contains an elastic body 211 and the centering that connects of floating each other regulates pressure head 212; Said elastic body 211 is inserted in the housing 213, and the upper surface of this elastic body 211 is a first surface 2111; Said centering is regulated pressure head 212 and is located by connecting with equal pressing plate 4; Be that every said sensor 21 is all regulated pressure head 212 through corresponding centering and is located by connecting with equal pressing plates 4, and this centering bottom surface of regulating pressure head 212 is provided with first groove 2121 that matches with said first surface 2111; The longitudinal axis that said centering is regulated pressure head 211 and elastic body 212 coincides.
Please in conjunction with consulting Fig. 5 and Fig. 6, every said thrust articulated bearing 5 all is located by connecting with last bearing plate 3, and every said thrust articulated bearing 5 is all fixedlyed connected with equal pressing plate 4.The longitudinal axis of every said thrust articulated bearing 5 all coincides with the longitudinal axis of respective sensor 21; Every said thrust articulated bearing 5 all contains a bulb 51 and a ball seat 52 that floats and connect each other; Said bulb 51 is located by connecting through a connection piece 6 and last bearing plate 3, and the bottom surface of this bulb 51 is one second curved surface 511; Said ball seat 52 is fixedly connected with equal pressing plates 4, and the upper surface of this ball seat 52 is provided with second groove 521 that matches with this second curved surface 511; The longitudinal axis of said bulb 51 and ball seat 52 coincides.
Please combine to consult Fig. 5 and Fig. 7; In order to know easily the principle of the force transducer among the present invention 1013 is set forth; The applicant places three sensors 21 on the same straight line, and is as shown in Figure 7, and in Fig. 7; The applicant adopts letter characters to carry out mark again to thrust articulated bearing among Fig. 55 and the middle pressure head 212 of regulating; Particularly, three thrust articulated bearings 5 are labeled as thrust articulated bearing M, thrust articulated bearing N, thrust articulated bearing R from right to left successively, will to regulate in each pressure head 212 from right to left successively respective markers be middle adjusting pressure head M ', middle adjusting pressure head N ', middle adjusting pressure head R '.Wherein, thrust articulated bearing M, thrust articulated bearing N, thrust articulated bearing R, centering regulate pressure head M ', centering regulate pressure head N ', centering regulate pressure head R ', go up bearing plate 3 and all pressing plate 4 promptly constitute uncle sieve Weir mechanism.Because each bulb 51 all is that curved surface contacts with corresponding each ball seat 52; Each centering is regulated pressure head 212 (see figure 5)s and is also contacted for curved surface between each elastic body 211 accordingly; Thereby thrust articulated bearing M, thrust articulated bearing N, thrust articulated bearing R, centering regulate, and pressure head M ', centering regulate pressure head N ', centering is regulated pressure head R ' and formed the consistent parallelogram of two size shape all the time, is respectively parallelogram MM ' N ' N and parallelogram NN ' R ' R.When this force transducer 1013 bearing load F; Load F distributes and acts on three elastic body 211 tops; If can cause bearing plate 3 to tilt when load F skewness, 3 distortion of asymmetric or last bearing plate; And because of the contact of above-mentioned curved surface, it is all parallel with NN ' respectively then to go up how to tilt MM ', RR ' of bearing plate 3, thereby can effectively reduce the detection error of bringing because of last bearing plate 3 work distortion, testee (not shown) error of centralization generation eccentric load, tilting load.Distributed load on last bearing plate 3 is component F
3When being in apart from elastic body 211, one and F are just arranged for the position of d
3The masterpiece that the equal and opposite in direction direction is identical is used for thrust articulated bearing M and centering is regulated pressure head M ', and just have a numerical value this moment is F
3The torque of d is between MM '; Thereby thrust articulated bearing M is pulled to the right side at the M place; Locate that at M ' centering is regulated pressure head M ' and push the left side to; But owing to receive the restriction of NN ' (be thrust articulated bearing N and centering regulate pressure head N ') point, on thrust articulated bearing M and centering adjusting pressure head M ', will produce equal and opposite in direction, reacting force f in the opposite direction respectively
3, f
3', thereby form one and F
3The numerical value that d equates is f
3S (or f
3(s is f to ' s) opposing torque
3With f
3Lateral separation between the ' application point), F as a result
3The d torque is by f
3S (or f
3' s) institute's balance, last, on thrust articulated bearing M and centering adjusting pressure head M ', have only and F
3The power that the equal and opposite in direction direction is identical works, and irrelevant with eccentric position and eccentric distance, in like manner, this situation is regulated on the pressure head N ' at thrust articulated bearing N with centering, also identical on thrust articulated bearing R and the centering adjusting pressure head R '.Therefore when force transducer 1013 being applied a load F and is directed force F; No matter rotate or change the installment state of force transducer 1013; Twice numerical value difference was very little before and after display instrument (not shown) showed; Thereby this force transducer 1013 has good rotation effect, and it is good promptly to detect the indicating value repdocutbility.
To sum up; The calibrating installation 100 of a kind of large-scale weighing machine of the present invention need not to adopt standard test weight or standard test weight and substitute that large-scale weighing machine is carried out loading and unloading; And compare with existing other non-counterweight type weighing instrument verification device; Not only simple in structure, and can improve greatly calibrating work efficiency and security, and practice thrift cost; In addition, the improvement of the force transducer 1013 among the present invention can effectively improve its accuracy that detects indicating value, has solved the problem of the detection deviation of reading that is caused because of last bearing plate work distortion, the tested sensor error of centralization.
In addition, though the calibrating with automobile weighing apparatus is that example describes among the present invention, calibrating installation of the present invention is not limited in the calibrating of automobile weighing apparatus, can be used for the calibrating of the large-scale fixed electronic scale of various uses and structure.
Claims (2)
1. the calibrating installation of a large-scale weighing machine; It is characterized in that: comprise that consistent with the LOAD CELLS quantity of tested weighing apparatus at least calibrating unit and is used to support the basis of respectively examining and determine the unit; Said basis is provided with one and is used for the foundation ditch of ccontaining tested weighing apparatus, and is respectively arranged with basic embedded board on the basis of these foundation ditch both sides; Whenever this calibrating unit all comprise one be fixed in pedestal, on the basic embedded board be located at force transducer, an afterburning lever, a lever support, on the bearing plate be located on the pedestal add power cylinder, and a centering be positioned over the bulb pressure-bearing pad on the force transducer; Said bearing plate places on the weighing platform of tested weighing apparatus; One end of said lever support is fixedly connected with basic embedded board; And the other end of this lever support is articulated in afterburning lever; One end of said afterburning lever is positioned at bulb pressure-bearing pad top and contacts with this bulb pressure-bearing pad, and the other end of this reinforcing lever is connected with the piston that adds power cylinder through a support bar.
2. the calibrating installation of a kind of large-scale weighing machine as claimed in claim 1, it is characterized in that: the other end of said lever support is articulated in the middle part of afterburning lever.
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Cited By (7)
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| CN104061993A (en) * | 2014-06-24 | 2014-09-24 | 福建省计量科学研究院 | Automatic value-determining system of high-precision weighter load measuring instrument |
| CN105067447A (en) * | 2015-07-16 | 2015-11-18 | 中国石油天然气股份有限公司长庆油田分公司技术监测中心 | Pressure testing machine for propping agent test |
| CN105067422A (en) * | 2015-07-16 | 2015-11-18 | 中国石油天然气股份有限公司长庆油田分公司技术监测中心 | Pressing plate assembly used for propping agent test |
| CN108414241A (en) * | 2018-03-21 | 2018-08-17 | 郑州东辰科技有限公司 | A kind of Flat plate type brake verifying bench calibrating installation and calibration method |
| CN108458779A (en) * | 2018-03-21 | 2018-08-28 | 郑州东辰科技有限公司 | The weighing sensor calibrating installation and calibration method of Flat plate type brake verifying bench |
| CN108507799A (en) * | 2018-03-21 | 2018-09-07 | 郑州拽亘电子科技有限公司 | A kind of calibrating installation for brake inspection platform |
| CN110686762A (en) * | 2019-04-16 | 2020-01-14 | 北京伟衡科技有限公司 | Portable electric subway platform scale rapid calibrating device |
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| CN105067422A (en) * | 2015-07-16 | 2015-11-18 | 中国石油天然气股份有限公司长庆油田分公司技术监测中心 | Pressing plate assembly used for propping agent test |
| CN105067422B (en) * | 2015-07-16 | 2018-05-18 | 中国石油天然气股份有限公司长庆油田分公司技术监测中心 | A kind of proppant test Anchor plate kit |
| CN108414241A (en) * | 2018-03-21 | 2018-08-17 | 郑州东辰科技有限公司 | A kind of Flat plate type brake verifying bench calibrating installation and calibration method |
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| CN110686762B (en) * | 2019-04-16 | 2022-05-13 | 北京伟衡科技有限公司 | Portable electric subway platform scale rapid calibrating apparatus |
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