CN87217027U - Electronic dosing scale with steel-wood construction - Google Patents

Abstract

The utility model provides an electronic scale having a weighing preset function and an alert control function. The electronic balance can remove the tare of the ladle to accurately weigh the molten iron. The weight of the molten iron can be preset. When the weight of the molten iron in the ladle achieves the preset number, the electronic scale can automatically dispatch the alarm signal and the control signal. The electronic balance can be used for weighing and controlling the weight of the molten iron.

Description

Electronic dosing scale with steel-wood construction

The utility model belongs to the projection electronic weighing field.

Though at present the application of electronic scale is commonplace, being used for the electronic scale of accurate weighing molten iron does not have.Weight that at home can't the weighing molten iron can only be estimated with range estimation the weight of molten iron cause error very big by rule of thumb, is difficult to guarantee the quality of vermicular cast iron and spheroidal-graphite cast iron.The external electronic scale that uses is that electronic scale is hung on the suspension hook of driving, and then the molten iron casting ladle is hung on the suspension hook of electronic scale, measures the weight of molten iron in the ladle at any time.This electronic scale is not suitable for the production technology that China produces vermicular cast iron and spheroidal-graphite cast iron, more can't the application of spending.For adapting to the needs of vermicular cast iron and spheroidal-graphite cast iron production technology, develop a kind of electronic scale of weighing molten iron in conjunction with national conditions.

Goal of the invention of the present utility model, just provide a kind of have weigh prewired circuit and warning circuit structure, digital demonstration can accurately weighing ladle in the electronic scale of weight of molten iron, this electronic scale can be removed the tare weight of ladle, accurately the weight of weighing molten iron.It can preset the weight of molten iron, presets when several when the weight of molten iron in the ladle reaches, and can send automatically and report to the police and control signal.

The utility model is by claiming body and digital and electronic instrument two large divisions to form.Claim body to constitute by parts such as pan of a steelyard (1), sensor (2) and supports (3).Digital and electronic instrument (5) is away from claiming body, and the transmission of signal is finished by cable (4) and seen Fig. 1.Pan of a steelyard (1) is made by metal material or cast iron, and its shape can be garden shape or square or other shapes.Sensor (2) adopts LOAD CELLS, is contained in pan of a steelyard (1) bottom, support (3) top, and support (3) is made by metal material.Digital and electronic instrument (5) is made up of arithmetical unit (6), A/D converter (7), decoding monitor (8), the prewired circuit of weighing (9), warning circuit (10) and D.C. regulated power supply parts such as (11), and its functional-block diagram is seen Fig. 2.Arithmetical unit (6) is formed " summation " circuit with integrated operational amplifier, and it can carry out " addition ", " subtraction " and " ratio " computing.With the signal that three sensors are sent here, guide to three " addition input ends " of arithmetical unit, carry out additive operation, so that the general assembly (TW) on the reflection pan of a steelyard." tare weight " relevant voltage signal of ladle is guided to " the subtraction input end " of arithmetical unit and done subtraction, so that the deduction tare weight.Passing ratio computing again, make the arithmetical unit output voltage the millivolt number just in time equal alleged weight of molten iron the kilogram number.The circuit structure of arithmetical unit (6) belongs to known technology and repeats no more.A/D converter (7) is used for the aanalogvoltage of arithmetical unit (6) output is converted to digital quantity (binary-coded decimal).Adopt large scale integrated circuit " 3 1/2 biproduct somatotype A/D converters ".Comment a yard display circuit (8) to form by integrated circuit " sectional type code translator ", " driver " and charactron etc.It shows the data of A/D converter (7) output that display digit is exactly the kilogram number of alleged weight of molten iron with digital form.D.C. regulated power supply (11) is made up of integrated regulator, and it provides needed DC voltage for the various circuit of digital and electronic instrument internal and sensor, as ± 5V, ± 15V ,+12V ,-24V etc.The circuit structure of A/D converter (7), decoding display circuit (8) and D.C. regulated power supply parts such as (11) belongs to known technology, repeats no more.The prewired circuit (9) of weighing is made of parts such as decimal decoder (12), digital dial (13), Sheffer stroke gate (14), rest-set flip-flop (15), 4 input nand gates (16), and warning circuit (10) is made of parts such as warning register (17), relay circuit (18), flasher circuit (19), acoustics circuit (20) and reset switches (21).Weigh prewired circuit (9) and warning circuit (10) structure as shown in Figure 3.Consider that A/D converter (7) adopts the dynamic scan way of output, it has four data output terminal (Q ₁, Q ₂, Q ₃, Q ₄), can only export one digit number (binary-coded decimal) at every turn, also have four positions to select output terminal (DS ₁, DS ₂, DS ₃, DS ₄) cooperate with it.The order timesharing ground output strobe of output terminal by kilobit, hundred, ten and individual position selected in the position, and data output end is just correspondingly exported this number.According to this scanning way of output, designed the prewired circuit of weighing as shown in Figure 3.Utilize decimal decoder (12) that binary-coded decimal is translated into decimal number, on the stationary contact that ten output terminals in " 0～9 " of decimal decoder (12) receive hundred, ten respectively, " 0～9 " on individual three the digital dials in position (13) is corresponding, kilobit has only 0 and 1 liang of number needn't pass through decimal decoder (12).Digital dial (13) is used for presetting weight, as required four digital dials (13) is preset to certain numerical value, is the stationary contact connection of moving contact and its respective digital on each digital dial (13).If certain weight number just in time reaches the numeral that this figure place sign indicating number dial (13) is preset, then decimal decoder (12) is by the moving contact output high level " 1 " of this number dial (13), be referred to as " consistent signal ", " consistent signal " passes through Sheffer stroke gate (14) with this " position choosing " pulse, with this R-S trigger (15) set, " the consistent signal " that be about to this keeps in, " individual position " strobe pulse SD ₄After the electric capacity time-delay, with four R-S triggers (15) clear " 0 ", promptly Ge Wei " consistent signal " only kept in a scan period simultaneously.Therefore, have only when the 4-digit number on want weighing weight of molten iron and four the digital dials (13) is in full accord, four R-S triggers (15) are set simultaneously, and pass through NAND gate circuit (14) output action in alarm trigger, when reaching prevalue, NAND gate circuit (14) is alarm trigger (15) set, and makes the transistor turns of relay circuit (18), make the actuating of relay, the contact of relay can be used as control signal.Another closing of contact of relay can make flasher circuit (19) and acoustics circuit (20) energized and send warning.Press reset switch (21) R-S trigger (15) is resetted, remove and report to the police.Flasher circuit (19) adopts multivibrator, when reporting to the police, and oscillator energized and self-sustained oscillation promotes light emitting diode and flashes.Audible alarm circuit (20) adopts a large scale integrated circuit, sends alarm sound by loudspeaker.

This electronic scale is the weight of the interior molten iron of weighing ladle accurately, and the accurate measurement weight of molten iron is stable one of the joint link of China ink, the spheroidal-graphite cast iron quality of production of wriggling.Because weight of molten iron is controlled, make an amount of of alterant adding, stop the molten iron undertreatment or crossed the processing phenomenon, improved the stability that the iron of wriggling is produced, wriggling processing one-time success rate is reached more than 90%.Thereby improved working condition, alleviated working strength of workers.The utility model also meets the manufacturing technique requirent of the China ink of wriggling, spheroidal-graphite cast iron, and is easy to use, and this electronic scale has possessed removal tare weight function, promptly removes the tare weight of ladle.Can preset the weight of molten iron, this is different with general electronic scale, and general electronic scale can not preset weight.The weight that presets molten iron can be good with digit preset by digital dial (13), shows by numeral.When the weight of molten iron of weighing is consistent with the weight that presets, can send warning automatically.When weight of molten iron surpasses electronic scale range scope, also can send warning.The electronic scale range of weighing can stepping time series from 0～20 ton.

Description of drawings:

Fig. 1 molten iron electronic constant claims synoptic diagram

Fig. 2 digital and electronic principle of instrument block scheme

Fig. 3 weigh prewired circuit and warning circuit structural drawing

The utility model has been made model machine, and is after tested good with result of use.

Claims (1)

1. A kind of numeral that is made of parts such as pan of a steelyard (1), sensor (2), support (3), arithmetical unit (6), A/D converter (7), decoding monitor (8) and D.C. regulated power supplies (11) shows electronic scale, it is characterized in that having weigh prewired circuit (9) and warning circuit (10) structure, can remove the tare weight of ladle, the weight of accurate weighing molten iron, can preset the weight of molten iron, when the weight of molten iron in the ladle reaches when presetting, can send automatically and report to the police and control signal.

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