CN2473603Y

CN2473603Y - Micro grating electronic charging scale

Info

Publication number: CN2473603Y
Application number: CN 01222264
Authority: CN
Inventors: 朱孝立
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-04-30
Filing date: 2001-04-30
Publication date: 2002-01-23
Anticipated expiration: 2011-04-30

Abstract

The utility model discloses a microphotography grating electronic measure balance comprising a microphotography grating sensor, a detection shaping circuit, a mcu, a keyboard input circuit, a display circuit and a temperature sensor. The utility model is characterized in that the microphotography grating sensor alters the extension length of the spring under pressure to the photoelectric signal with a phase difference of Pi/2. After being shaped by the shaping circuit, the two channels of photoelectric signals are respectively sent to the I/O port RA0 and RA1 of the mcu. The I/O port RB0-8 and RC0-8 of the mcu are respectively connected with the keyboard input circuit and the display circuit. The spring temperature values detected by the temperature sensor are sent to the I/O port RA2 end of the mcu. The RA3 is connected with a buzzer. The photoelectric pulse counting, subdivision, calculation, keyboard response, displaying decoding drive and temperature compensation are all controlled and realized by only one mcu. The weight, unit price and cash amount are displayed one screen and are switched automatically. The utility model with the characteristics of accurate weighing, easy operation, overall functions and a low cost is suitable for wide use.

Description

Miniature grating electronic price computing scale

The utility model relates to a kind of weighing apparatus, and a kind of electronics electronic price computing claims, a kind of specifically miniature grating electronic price computing scale.

Present widely used spring scale scale is easy to cause measuring accuracy low owing to be subjected to the inherent shortcoming of temperature to mechanical transmission mechanisms such as the influence of spring and the wearing and tearing of gear clearance sum of errors, poor accuracy, many shortcomings such as easily artificial cheating.In addition, the spring scale scale does not more possess numeral demonstration, valuation and peeling function.And common electronic price computing scale connects differential amplifier and A/D converter and computer control part after all adopting strain transducer basically, shows to adopt weight, unit price, the amount of money to show respectively.Amplify and conversion owing to relate to the simulation micro-signal, therefore very high to sensor and operational amplifier and A/D circuit requirement, the circuit more complicated, the poor anti jamming capability of electronic scales, the manufacturing cost height makes to popularize to use to have difficulties.21 days March nineteen ninety of Patent Office of the People's Republic of China disclosed a kind of spring grating digital readout scale (notification number is: CN2063226U), it exists major defect as follows: because movable grating and indication grating produce to rock shakes the quality that will influence Moire fringe with the scale body accuracy of measurement is affected, be difficult to satisfy the actual requirement of weighing in the weighing process 1..2. photosensitive tube and luminotron are placed in respectively separately independently on the support, are easy to cause light shaft offset, can not count.3. this scale is not considered the influence of temperature to the metering result, and this will cause measurement result inaccurate.

In view of there is above-mentioned defective in prior art, the utility model provides a kind of miniature grating valuation scale, and this miniature grating valuation scale can not only accurately be measured weight, realizes that valuation shows and cost is very low.

The utility model realizes that the technical solution of above-mentioned purpose comprises miniature grating sensor, detects shaping circuit, single-chip microcomputer, keyboard input circuit and display circuit, it is characterized in that miniature grating sensor changes the elongation of spring stress into photosignal that the two-way phase differential is a pi/2, the two-way photosignal is sent into I/O port RA0, the RA1 of single-chip microcomputer respectively after the shaping circuit shaping, be connected to keyboard input circuit or display circuit respectively on I/O mouth RB0～8 of single-chip microcomputer or RC0～8.The spring temperature that temperature sensor detects is delivered to the I/O mouth RA2 end of single-chip microcomputer, and RA3 connects a hummer.Photoimpact numeration, segmentation, computing, keyboard detection, demonstration decoding driving, temperature compensation etc. are all realized by a slice Single-chip Controlling.

Below in conjunction with drawings and Examples the utility model is explained in further detail.

Description of drawings:

Fig. 1 is the electric theory diagram of a kind of specific embodiments of the utility model, is miniature grating sensor in the dotted line wherein;

Fig. 2 is a main program block diagram of the present utility model;

Fig. 3 is a Multi-Function Display synoptic diagram of the present utility model;

Fig. 4 is the structural representation of a kind of desk-top scale of the present utility model;

Fig. 5 is the multi-functional display subroutine block diagram of the utility model;

Embodiment:

Referring to Fig. 1 and Fig. 4 and in conjunction with Fig. 2, Fig. 3, when on the scale pan object to be weighed being arranged, be fixed in stressed elongation of spring (1) in the side's of weighing frame, load-bearing side's frame (2) is fixedlyed connected with key light grid (3) so is made corresponding mobile, sensor is installed on the circuit board (5) and maintains static, when indication grating (4) and key light grid (3) when relatively moving, because interference effect produces Moire fringe, detect output two-way photoelectric pulse signal through grating sensor, two paths of signals keeps pi/2 phase poor, deliver to single-chip processor i/o port RA0 and RA1 after the shaping of two paths of signals process shaping circuit, one-chip computer IC1 segments (quadruple) to two paths of signals, debate to obtaining spring stretch value L with step-by-step counting.

In order to eliminate the influence of environment temperature to the elasticity coefficient of metal spring, an important additional technical feature of the present utility model is to be connected to temperature sensor RT (referring to Fig. 1 and Fig. 4) on the I/O mouth RA2 of single-chip microcomputer IC1.When weighing, temperature sensor RT is transformed into the O/I mouth RA2 that electric signal is delivered to single-chip microcomputer IC1 with the temperature value around spring (1) (see figure 4), the environment temperature that temperature sensor RT records is after the inner A/D conversion of single-chip microcomputer IC1, by the software value of the being compensated Δ L (referring to Fig. 2) that tables look-up, spring stretch value L and offset Δ L addition are just obtained actual weight, thereby revise the temperature influence that elongation brings to spring, obtain reflecting the count value of actual weight, this count value outputs to display screen by single-chip microcomputer IC1 and shows the weight result after decoding output, if the keyboard input has this cargo price, single-chip microcomputer IC1 will further show the unit price and the amount of money of these commodity of weighing by computing on display screen.

Ordinary electronic valuation scale shows general LCD (liquid crystal display), LED (diode displaying) or VFD (fluorescent character-display tube demonstration) mode of adopting, weight, unit price, the amount of money divide a screen triplex row or three parts to show respectively, so not only increase the difficulty of decoding driving but also make the cost of scale increase a lot.In order to realize simplifying the operation, the purpose that reduces cost, another additional technical feature of the miniature grating valuation of the utility model scale is that display screen is designed to Multi-Function Display (referring to Fig. 1, Fig. 3, Fig. 4 and Fig. 5), it is characterized in that with kilogram ,/, unit equally participates in the display field coding and decoding as section independently with digital display segment, determines that according to current grating scale mode of operation the unit of display is " kilogram " ((weight), " unit/kilogram " (unit price) or " unit " (amount of money) (referring to Fig. 2).So only, not only simplified hardware, improved display effect and greatly reduce cost with having realized that once shielding weight, unit price, the amount of money show.It is applicable to LCD, LED and VFD display mode.Grating scale keyboard is provided with " inquiry " function key, is used to recall the previous weighing process value of demonstration.

Claims

1, a kind of miniature grating electronic price computing scale comprises miniature grating sensor, detects shaping circuit, single-chip microcomputer, keyboard input circuit, display circuit and hummer.The two-way that it is characterized in that miniature grating sensor is input to shaping circuit, two output terminals of shaping circuit are connected with I/O mouth RA0, the RA1 of single-chip microcomputer respectively, are connected to keyboard input circuit or display circuit respectively on I/O mouth RB0～8 of single-chip microcomputer or RC0～8.

2, a kind of miniature grating electronic price computing scale according to claim 1 is characterized in that being connected to temperature sensor RT on the I/O mouth RA2 end of single-chip microcomputer.

3, according to claim 1 and 2 described a kind of miniature grating electronic price computing scales, it is characterized in that display design becomes Multi-Function Display, this display screen show section except that comprising " 8 " field bit, also contain unit ,/, three kinds of sections of kilogram and participate in coding and the decoding demonstration.