CN2107015U - Multi-functional pocket electronic balance - Google Patents

Abstract

The utility model relates to a multi-functional electronic balance. In an outer shell with mechanical strength, a weighing hook of the structure that a weighing sensor, an amplifier, and a displayer are orderly and electrically connected is universally connected with a sensor. A balanced lifting ring attaches to a beam in a casing and is fastened with an alloy elastomer to suspend in the casing. A weighing survey meter is formed by the sensor, a CMOS, an instrument amplifier composed of IC, a converter, a keyboard, and a display circuit which are connected. By a body battery, the multi-functional electronic balance can also externally connect with a power supply. When the casing is held or lifted by hands, the multi-functional electronic balance can automatically balance, displays weighing quantity, and meanwhile also displays price-counting amounts. After the weighing and the price counting of the multi-functional electronic balance are end, the utility model automatically times to sound vibrating bells and displays dates and time.

Description

Multi-functional pocket electronic balance

The utility model belongs to the pocket utensil of weighing that a kind of full-electronic multifunctional digital shows, particularly can weigh in the flowing environment of AC-less power power supply, the demonstration of valuation, date, time.

Existing electronic scales by housing, mechanical speed-control device, sensor transducing head, circuit servo processing system, read demonstration etc. and form, sell in market and what use at present is exactly this form.The object of weighing is placed on connecting sensor in the mechanical tray of overbalance adjustment, sensor output compliance voltage (stream) prepositionly does that micro-signal amplifies, filtering, is transformed into the analog-to-digital analog quantity of confession, carry out calculation process through the A/D conversion by single-chip microcomputer, drive fluorescence display and show.When using this electronic scales, keep flat and carry out the mechanical equilibrium adjustment in operating table surface, the weight and volume of object of weighing must suit to weigh pallet volume and must be put in the pallet center, liquid or light weight large volume and need hang the object of weighing and be difficult to conveniently weigh.The fluorescence nixie display needs higher driving voltage, must adopt the power frequency supply power supply, wishes to get clear display, should use in the darker environment of illumination.Adopt the way that deducts the zero pressure data to eliminate factors such as imbalance, drift on the circuit structure, regularly the data of zero pressure correspondence are sent into microprocessor exactly, try to achieve the clear data of actual pressure correspondence deducting the zero pressure data in the gained data in pressure survey.Because output is non-vanishing when being input as zero, there is bigger common mode output and causes that circuit lacks of proper care, to a certain extent, common-mode signal can increase with the hurried increase of gain, promptly be to deduct the zero pressure data, still there is common-mode error in reality, is difficult to the degree of accuracy that realizes that trace is weighed.

The purpose of this utility model provides that a kind of scope of application is more extensive, weighing is accurate, cheap, carry, thereby realizing being conveniently used in variously weighs, valuation, date, time showing and regularly, ring make a noise, multifunctional pocket electronic scaless such as computing.

The utility model is realized as follows.

A housing that constitutes by plastics or metal; the shell face that operation and keyboard show; the detection meter that sensor and the coupled hook of weighing constitute; display; the balance suspension ring; the multifunctional pocket electronic scales of position limitation protection screw; that can rotate arbitrarily weighs the direct movable commissure of hook on the detection meter of forming with sensor; grasp the just automatic vertical equilibrium of housing or lifting balance suspension ring; weighing of an inverting element sensor formation detects meter; the signal that detects is directly inputted into the preposition ratio of carrying out and amplifies; the instrument amplifier that three computing integrated amplifiers are formed has good symmetry; first order common-mode error signal source in the input amplifier will be output the subtracter of level and offset; make that output also is zero when being input as zero; output is for the analog quantity of A/D conversion after two rank active power filtering shapings; 4 1/2 LCD display of high resolution monolithic CNDS IC adapted multichannel torch battle array dynamic scan are directly finished analog quantity---the A/D conversion of digital quantity; counting; decoding; drive LCD display and directly show weighed quantity; pass through keyboard; small-sized microprocessor symmetry tuple is according to valuating; amount of money computing; directly drive and be shown on 10 LCD display of another multi-channel scanning; after the computing of weighing finishes, recover the date; demonstrations such as time.With the different LCD of fluorescence display, the bright more clear display more of illumination, CNOS high resistant voltage control device, power consumption is extremely low, so reached the multifunctional pocket purpose.The embodiment that will describe in detail below adopting, all electronic structure, cost is less than having 1/5th of electronic scales, 1/50th of volume now.

In conjunction with the following drawings the utility model is done to describe further.

Fig. 1 is an one-piece construction synoptic diagram of the present utility model.

Fig. 2 is an electrical schematic diagram of the present utility model.

With reference to Fig. 1, have the circular metal or the Plastic hanger (1) that close the symbol physical strength, by rivet welding in the ellipsoidal surface circular metal or plastic cap (2) of middle perforate, pass circular outer rim and attack flower, inner edge wedged bottom nut (3), tightly be threaded onto the top recess of socket screw (4), constitute universal the connection with interior line wedged bottom nut (3).The screw rod of concave crown screw (4) directly links to each other with the tight tooth in sensor (6) alloy elastic body lower end, and sensor alloy elastic body (6) depends on the central sill tapping that flat head screw (7) is anchored on body shell frame, constitutes one time energy converter.The center of top tapping of housing (17), be with the interior line screw (8) of tack hollow of lower end band cap, the screw rod of line screw (8) slightly is longer than the thickness of housing (17) roof in the tack hollow, tightens after the tack outer rim attacks colored screw (11), still can radially rotate.The top unwarranted charge lower edge of attacking colored flat head screw (11) disjunctor with outer rim is processed into along the recessed semicircle cambered surface of axle core with the upper limb of intermediate step cap, the anti-mechanical pulling force lifting of a half elliptic is crossed in the center, the metal or the plastics collar (10) that hang can be in the operations of weighing of any environment in order to lifting or fixed body.Housing (17) lower edge is located by line nut (3) in the wedged bottom; fall into the into adjustment screw (5) of housing (17), near the lower edge of sensor (6), the impulse stroke of screw (5) is adjusted in fine setting; the work of lockable and limit sensor, protection device is not mechanically damaged.The elastomeric strain regions of the aluminium alloy of sensor (6) is pasted and is connected into tetragonal four quick foil gauges of both-end element power, driving source that links to each other with the diagonal angle with other two test sides that the diagonal angle links to each other, detection be difference between two pots outputs of cross-over connection and driving source.

The utility model LOAD CELLS (6) structure becomes the S type, volume only the diplopore beam type 1/10th.

The utility model shell face (16) is equipped with and shows latch switch (13), the LCD display (15) that weight LCD display (14), the valuation amount of money, date, time etc. show, the function conversion, keyboard (overweight, short weight, low-voltage indication are cutd open the end and expressed).

Housing of the present utility model (17), shell face (16) adopt engineering plastics injection moulding or alloy in lightweight cast molding, and housing shell face is integral by the dowel engagement.

With reference to Fig. 2, by LED, BG ₁, BG ₂The cell voltage monitoring circuit that VR forms is set up VR, presets the cell voltage lower limit, when cell voltage exhausts near lower limit soon, and BG ₂End BG ₁Conducting, light emitting diode LED is shinny, and caution need more renew battery.Here, the monitoring circuit continuous working is in the action period of battery, the about 200NA of power consumption.The compact battery of available ontologies configuration also can the external power supply power supply.

For guaranteeing weighing precision, with operational amplifier IC ₂, energy gap pipe IC ₁, BG ₃, W ₁The voltage-regulating circuit of forming is accurately adjusted W ₁Can obtain high-precision burning voltage output, pass through IC ₃Reversal, obtain reverse voltage.

With RV ₁-RV ₄The transducer that the quick foil gauge of power constitutes, connect into tetragonal four both-end elements, a driving source that links to each other with the diagonal angle and the voltage detecting end that links to each other with other two diagonal angles constitute and detect actual cross-over connection that meter the detects difference between exporting with two pots of driving source, by the electrology characteristic to the element of metering circuit more indirectly of same element; Work as RV ₁/ RV ₄=RV ₂/ RV ₃The time, resistance bridge always is in zero-bit, and the ratio that two resistance values increase in four resistance is identical with the ratio that other two resistance values reduce, and the complementarity of resistance variations can obtain linear output.

With RG, IC ₄, IC ₅, IC ₆The integrated instrument amplifier of three amplifiers that constitutes, further the issuable common mode interference of signal, time and the temperature drift to detecting device output suppresses, and simultaneously, weighing-up wave is accurately amplified.High precision low temperature floats the instrument amplifier that integrated operational amplifier is formed, and its conversion characteristic is:

Output: V _ONT=imports (V1N ⁺-V1N ^-) ((R _7.8)/(RC)+1) ((R ₁₁)/(R ₉))

In the formula: R ₇=R ₈, R ₉=R ₁₀, R ₁₁=R ₁₂

R in the circuit ₁₁, R ₁₂, R ₉, R ₁₀Ratio coupling decision common-mode rejection ratio and gain accuracy, R ₇And R ₈Coupling irrelevant to common mode inhibition, in certain limit, accurately select RG to obtain the prime desired gain and can not increase the common-mode error signal, in view of this, common mode inhibition is proportional to gain sharply to be increased, common-mode signal but no matter gain only amplify with the factor 1.Because common mode voltage can not appear at the RG two ends, generally do not have very big electric potential difference between the operational amplifier input end, common mode current just can not flow through RG, and bigger common-mode signal just can be independent of gain and handled in the limit of operational amplifier.Because select for use CMOS technology high precision, high-gain, low temperature to float, the instrument amplifier formed of zeroing, high cmrr integrated operational amplifier has high precision and symmetry certainly, so the first order in input amplifier promptly is the subtracter that the common-mode error source also will be output level to occur to offset.Because A/D of the present utility model conversion drives monolithic CNOSIC shared with decoding and directly drives demonstration, can not adopt typically the way that deducts the zero pressure data with single-chip microcomputer to eliminate imbalance and temperature is floated, this just requires instrument amplifier will have high conversion accuracy and common-mode rejection ratio.

IC ₇, C ₈, R ₁₄, R ₁₅The two rank active low-pass filters of forming are to the further shaping purifying of simulating signal of instrument amplifier output.

If: R ₁₄=R ₁₅C ₉=C ₈

The passband point

$f=\frac{1}{2\sqrt{2\mathrm{\π}{R}_2\·C_2}}$

It is 1 that wave filter gains in passband, and straight response is arranged, and at cut off the decay of 3dB is arranged, and has the attenuation slope of every octave 12dB.

LCD device for digit-displaying with CNOS adapted matrix multi-channel scanning (sweeping fast 100HZ) constitutes the demonstration of reading of the present utility model, integrate frequency division, count, latch, decipher, driving, logic control, automatic zero set (AZS), finish the analog quantity of the data of weighing---the digital quantity conversion directly drives LCD display and shows.Have low voltage warning, the RENGE end is inner to place (DG) low level by the 3NA electric current with its level, so can outside unsettled use.(EOC) the L/H end adds high level V ₊In time, will lock and show reading, can also finish occur negative-going pulse when the internal lock storage upgrades numeral in conversion and be used for external interface as conversion done state sign and control.Utilize OR and VR signal to realize surpassing, owing the range caution.The identification of CON output LOW voltage is reported to the police and is shown, to guarantee weighing precision.

Running clock produces the quartz crystal unit KT that uses 120KHZ, becomes 60KHZ as the transition count clock behind inner 2 frequency divisions of IC.R ₁₆, C ₁₅Be used to remove disturbing pulse, R ₁₆Have the input overcurrent protection concurrently.IC ₈The energy gap pipe is further stable to reference voltage, C ₁₀With removing interference noise, fine setting W ₄Obtain accurate reference voltage, the COM end connects the positioning end of VR as reference voltage source, makes V ₊To V _R-Voltage be fixed on about 3.2V usually.The VD1Sp end is the current absorption end of LCD display, becomes to adapt to the driving voltage of LCD display with the resistance bias pressure.

With the 4 1/2 bit digital displays that CNOS constitutes, resolution is up to 10NV, and the common-mode rejection ratio of input end reaches 110dB, is enough to guarantee service precision of the present utility model.

With the NECD1033G microprocessor is that the calculating, time, date of core shows and rings the device that makes a noise, convenient and enlarged usable range of the present utility model, but both parallel operation also can be used separately, and its structural principle has not belonged to the utility model and described scope, does not describe in detail for this reason.

Claims (6)

1, a kind of multifunctional pocket electronic scales, in the shell of physical strength is arranged, LOAD CELLS, amplifier, display sequential circuit connect, it is characterized in that, the hook of weighing links to each other with sensor is universal, and the balance crane plutonium depends on the housing central sill and is suspended in the housing with the alloy elastic body is fastening, near adjusting screw, in the detection of weighing that sensor constitutes, the instrument amplifier that CMOS IC forms, converter, keyboard, display circuit connect.

2, multifunctional pocket electronic scales according to claim 1, it is characterized in that, balance and fixedly hang plutonium (10) movable transverse and be through at outer rim and attack the top tack unwarranted charge lower edge of colored flat head screw (11) disjunctor and intermediate step along in the half garden inner arc in axle center, housing back timber thickness was longer than on the top of line screw (8) in tack was hollow, weigh the upper limb top rivet welding of hook (1) in the ellipse garden ball top cap (2) of middle perforate, support garden shape outer rim is attacked colored inner edge wedged bottom nut (3) and is anchored on sensor (6), constitute universal connection, adjust screw (5) near sensor (6).

3, according to the multifunctional pocket electronic scales of claim 1, it is characterized in that, the elastomeric strain regions of the alloy of sensor (6) is pasted and is connected into tetragonal four both-end force sensing elements, driving source that links to each other with the diagonal angle with other two test sides that the diagonal angle links to each other, detection be difference input instrument amplifier between two pots outputs of cross-over connection and driving source.

According to the multifunctional pocket electronic scales of claim 1 or 3, it is characterized in that 4, the simulation volume of instrument amplifier output is through A/D conversion rear drive digital indicator, by keyboard, another display of small-sized microprocessor driven shows the computing price amount of money.

5, according to the multifunctional pocket electronic scales of one of claim 3 or 4 item, it is characterized in that, with IC ₁, IC ₂, BG ₃, W ₁, the voltage-regulating circuit that constitutes, can use the body compact battery, also can power by external power supply.

According to the multifunctional pocket electronic scales of claim 1, it is characterized in that 6, the computing applied in any combination simultaneously of weighing and valuate also can be established one's own system and be used separately, housing shell face is by engineering plastics or alloy in lightweight machine-shaping, by dowel engagement one.

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