CN2225030Y - Small-size electronic hanging scale - Google Patents

Abstract

The utility model relates to a small-sized electronic hanging scale, belonging to the technical field of electronic measurements. A strain pressure transducer adopted is composed of an elastomer and two foil type strain foils. A voltage-stabilizing and constant current circuit is designed as a power supply for sensors to ensure the small-sized electronic hanging scale to work effectively. A differential signal amplifying circuit is composed of electronic elements with well-matched parameters. An A/D converter adopts an integrated circuit block. Measured data is displayed from a liquid crystal display window. A mini calculator is matched to weigh and figure conveniently. Because of a compact structure and less but better adopted elements, the small-sized electronic hanging scale has the advantages of small size, high precision, convenience and practicability, being suitable for street traders and families.

Description

Miniature electronic hangs title

Belong to electronic measuring technology field.

In recent years, along with developing rapidly of microcomputer technology, weighing technology strides into intelligentized instrument ranks, the electronic price computing of used in the market all size claims, mostly adopt the Weighing type pressure transducer of diplopore girder structure, signal is through amplifying, and after the analog to digital conversion, the display of being made up of the LED light emitting diode shows the price that weight of object and computing machine are calculated simultaneously.This electronic scale adopts numeral to show, and is accurately directly perceived, must be better than machinery and claim and lever scale.But because volume is bigger, heavier, price is also relatively more expensive, and this title is only applicable to the fixedly stand of shop, country fair, and general pedlar and even average family are accepted.

Goal of the invention of the present utility model just is to design and develop a kind of novel simple and easy miniature electronic and claims, makes it to satisfy certain check weighing precision, can easily valuate again, and be easy to carry, and is with low cost, is suitable for pedlar and average family and uses.

For realizing such goal of the invention, the inventor combines electronic component, the integrated circuit of specially designed strain pressure transducer and parameter matched well, mix slim calculator, make a kind of portable minisize electronics and hang title, can weigh and can valuate.

Pressure transducer is made up of a slice sensor elastomer and two paper tinsel formula foil gauges in the utility model, and electronic circuit mainly comprises signal amplifier, analog to digital converter, several parts of data liquid crystal display.

Fig. 1 hangs the structural representation that claims right section for electronics.Liquid crystal window 1 adopts 3 1/2 to show that meter is heavy among the figure, can show 3 figure places, and switch 4 is contained in and hangs the side that claims housing 2.Upper and lower surface in the left side of sensor elastomer 3 (also can be the right side), promptly positive and each symmetry of reverse side is pasted a slice paper tinsel formula foil gauge 5, forms LOAD CELLS.LOAD CELLS is placed in the symmetrical groove in housing 2 bottoms, paste the left end of foil gauge at sensor, a steel disc liner is arranged on the plane of fulcrum, with support fixation pressing plate 6 left end of sensor is fixed, a slice linearity of the right-hand member fulcrum liner of sensor is adjusted pad 9, makes positioning and fixing with support fixation pressing plate 8.Adjust the position, the left and right sides of pad 9, can change the strain of sensor, the linear error of weighing in order to adjustment.

Suspension hook seat 10 is screwed the middle-end at sensor elastomer 3, and the suspension hook 12 usefulness sling chains 11 of the usefulness of weighing are connected on the suspension hook seat.Circuit component is all concentrated and is contained on the wiring board, is placed in the sensor upper left side, and battery case 7 is arranged in the sensor upper right side.Sensor is critical component in the utility model, it is the critical elements of accuracy, stability and the sensitivity of decision electronic scale, so, the stickup of two foil gauges is antisymmetry just, center line can not misplace, the linearity in order to avoid influence is weighed, the end fulcrum also must the maintenance level about sensor.

Fig. 2 hangs the panel arrangement synoptic diagram that claims the back side for electronics.Counter liquid crystal window 13 is a group counter button 14 up below, and its layout, function are with common slim calculator.

Fig. 3 hangs the circuit theory diagrams of title for electronics.R1, R2, R3, R4 form resistance bridge among the figure, and wherein R1, R2 are two foil gauges of sensor, are the both arms differential bridge.Because the bridge circuit power supply needs constant-current driving, so that carry out temperature compensation effectively, for this reason, the inventor has set up in circuit by diode D, operational amplifier F1, reaches the pressure-stabilizing constant flow circuit of triode T, R5, R6 composition, as bridge power supply.When non-loaded, electric bridge should be exported total null voltage, and adjustable resistance W1 is used for adjusting the electric bridge unbalance voltage.When suspension hook hung on alleged object, the sensor elastomer distortion caused that foil gauge resistance R 1, R2 change in resistance, resistance bridge just have signal output, enter amplifier F2 through capacitor C 1 filtering.Amplifier F2 adopts 0P-07 and R7, R9, C3 and R8, R10, C2 to form the differential wave amplifying circuit, outputs to the A/O converter.Adjustable resistance W2 is as the ratio adjustment of weighing.Because amplifier F2 selects resistance matched well in the 0P-07 of hi-tech parameter and the circuit for use, can control temperature effectively and float, drift makes input signal be able to accurate amplification.A/O converter in the circuit is selected ICL7106 for use, and it has necessary all functions of A/O conversion, on chip piece, has comprised reference voltage circuit, clock oscillation circuit and liquid crystal display and LCD driving circuit.30 and 31 pin of signal input ICL7l06 after the amplification show reading by liquid crystal window, can claim the little counter at the back side to valuate by hanging then.

The utility model is owing to adopted the strain pressure transducer of special construction and had the high performance integrated circuit piece, and all electronic component parameters are all passed through matched well, thereby has a compact conformation, the little precision height of volume, long-lived advantage, can be in check weighing accounting price, convenient and practical, and whole hanging claims that cost can be very not high, be suitable for vast average family and pedlar and use, have vast market.

In embodiment of the present utility model, sensor elastomer 3 adopts the 65# steel disc, its blank is processed into thickness after bakingout process be 0.65～0.7mm, paper tinsel formula foil gauge 5 sticks on the elastic body left side, positive antisymmetry, sensor left side fulcrum liner steel disc is 8 * 8 * 0.5mm, the linearity of right-hand member fulcrum liner is adjusted pad 9, with the steel disc of l2 * a 8 * 0.5mm, all fix with pressing plate.Hanging the title rated load is 3.5kg, heavy with 3 1/2 liquid crystal display meters.Electronic circuit such as Fig. 3 of adopting, power supply is 9V, and diode D is 2CW53 in the pressure-stabilizing constant flow circuit, F1 UA741, triode is 25A1015, R5=510 Ω, R6=4.7K, R1～R4 is 350 Ω in the resistance bridge, wherein R1, R2 are foil gauge, adjustable resistance W1=100K, and on panel, put an adjusting knob, can be advantageously used in zeroing.C1=C2=C3=0.33 μ, R7=R8=3K, R9=R10=120K, F2 adopts 0P-07, W2=10K, A/O converter 1CL7106, whole electronics hang and claim shell sizes 58 * 115 * 22mm, small volume and less weight, measuring accuracy can reach ± and 0.3%, accessibility weighing apparatus standard fully.

Claims (3)

1, a kind of miniature electronic hangs title, by pressure transducer, signal amplifier, several parts of analog to digital converter and data presentation are formed, it is characterized in that pressure transducer is made up of a slice sensor elastomer and two paper tinsel formula foil gauges, each symmetry of left side upper and lower surface at sensor elastomer (3) is pasted a slice paper tinsel formula strain (5), sensor is placed in the symmetrical groove in housing (2) bottom, steel disc of liner on the plane of sensor left end fulcrum, with support fixation pressing plate (6) the sensor left end is fixed, sensor right-hand member fulcrum liner a slice linearity is adjusted pad (9), make positioning and fixing with support fixation pressing plate (8), suspension hook seat (10) is screwed the middle-end in sensor elastomer (3), suspension hook (12) is connected on the suspension hook seat with sling chain (11), in the circuit by R1, R2, R3, R4 forms electric bridge, R1 wherein, R2 is two foil gauges of sensor, and by diode D, operational amplifier F1 and triode T, R5, the pressure-stabilizing constant flow circuit that R6 forms is as bridge power supply, and data presentation adopts liquid crystal display.

2, hang title by the described miniature electronic of claim 1, it is characterized in that sensor elastomer (3) adopts the 65# steel disc, thickness is 0.65～0.7mm, and the R1=R2 that forms electric bridge in the circuit is 350 Ω foil gauges, R3=R4=350 Ω metalfilmresistor.

3, hang title by the described miniature electronic of claim 2, it is characterized in that diode D is 2CW53 in the pressure-stabilizing constant flow circuit, operational amplifier F1 is UA741, triode T is 2SA1015, R5=510 Ω, R6=4.7k, amplifier F2 adopts 0P-07, and the A/O converter adopts ICL7106.

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