CN2030716U - Automatic-control balance composed of general computerized balance - Google Patents

Abstract

The utility model discloses a device for developing a general use digital display computer scale to an automatic control scale. The device is composed of a common computer scale having a dynamic scan digital display and a customed designed micro-computer system which can receive the character form of the dynamic scan digital.

Description

Automatic-control balance composed of general computerized balance

The utility model is the device that the computer balance of the numeral demonstration of general applications is expanded to automatic control scale.

There are many occasions to carry out discontinuously or weighing automatically continuously in process of production to weight of material.For example go out to put in storage material proportion in metering, the production technology, the finished product quantitative package of plurality of raw materials such as chemical industry, metallurgy, building materials, food, feed, harbour all will be controlled relevant devices such as worm conveyor, vibro-feeder, feeding gate, discharge door with the control scale, thereby reaches the purpose of measure control.

Because customer requirements differs, to control scale automatically and all need special design, its manufacturing cycle is long, and difficulty is big, cost an arm and a leg (from external import, every cover price about 10,000 is to tens thousand of dollars), static accuracy about 0.1%.

The utility model shows computer balance, custom-designed expanding system (hereinafter to be referred as the micro computer) formation that the microcomputer of general utility functions is arranged with the dynamic scan numeral of general applications.Because the computer balance of general applications can not externally provide the data code (as ASC II sign indicating number, binary-coded decimal) of standard, so common microcomputer can't be online with it.Micro computer of the present utility model, except the general industry control keyboard (or dial) that microcomputer had, data display equipment, relay output, printer interface, serial data communication mouth, working condition input port are arranged, also has the interface that under software is supported, to accept and to discern the seven segment digit font signal of dynamic scan.It is online that this interface can and have the common computer scale of dynamic scan digital indicator, and the micro computer after online can obtain weight signal from computer balance, and this signal is implemented control by the program of establishment in advance to the topworks for, discharge system after treatment.The microsystem structured flowchart reaches with the interface of common computer scale sees Fig. 1, the socket left side is the digital font display circuit of common computer scale, the right is a micromachine system, and the diode D in the interface has unilateral conduction, can prevent that external micro computer from influencing the Presentation Function of computer balance.

In order to simplify circuit, computer balance nearly all adopts the dynamic scan display technique, the oscillogram when Fig. 2 is computer balance dynamic scan seven segment digital tubes display digit.By Fig. 1 upper left quarter as can be known, the digital font in each charactron in the computer balance display screen constitutes by seven sections stroke electrode a, b, c, d, e, f, g and a gating position D.Stroke electrode a, b, c, d, e, f, the g of all charactron correspondences are drawn after linking respectively, and gating position D draws separately, is respectively D Zi high-order to low level ₄, D ₃, D ₂, D ₁, D ₀When showing, the display prot D of computer balance ₄'-D ₀' export the gating position D that a strobe pulse is applied to charactron accordingly by turn ₄-D ₀The position, in each strobe pulse the pairing time, display prot a ', b ', c ', d ', e ', f ', g ' output font signal are applied on this charactron a, b, c, d, e, f, the g, make charactron show that the corresponding digital font is (because display consumes certain power, computer balance display prot a '-g ', D ₀'-D ₄' need after treatment could driving display a-g, D ₀-D ₄).Micro computer is accepted digital font signal by the sequential requirement of Fig. 2 from the computer balance display prot, in order to guarantee to obtain the burst data of big-endian, most significant digit D ₄' should join D with the interrupting input end INT of micro computer chip ₄The negative saltus step of ' output has activated the interruption of micro computer, and interrupt routine makes P ₁₀-P ₁₆Mouth is accepted the font segment signal a '-g ' of computer balance myriabit, and then P23 just waits for D ₃' low level arrive, when low level arrives, P ₁₀-P ₁₆Mouth is accepted the font segment signal a '-g ' of kilobit again, and mode is accepted hundred, ten, individual font segment signal more according to this, and this signal just can obtain complete data after micro computer is handled.The pulse of computer balance output be low level effectively or high level effectively depends on the design of former computer balance, this example and Fig. 2 effectively illustrate with low level.

The utility model has the advantages that conspicuous, because now the computer balance manufacture craft of producing is exquisite, with low cost, precision is up to 1/3000, and microcomputer control is flexible, adaptability is strong, reliability is high, the different occasions that are particularly useful for Industry Control, with this two combination, can make weighing apparatus manufacturing plant and even user can finish the automatic control system of high precision weighing with minimum cost, the fastest speed.

Below in conjunction with picture specification two kinds of embodiment of the present utility model.

Fig. 3 is that the utility model is used for powdery or granule materials automatic barrelling.(2) are to control scale automatically among the figure, power turn-on switch (5), the empty bucket (8) that will feed is placed on the raceway (10) of weighing platform (9), weighing platform comes down to a resistance load sensor, it links with computer balance (1) by measuring cable (18), setting value (as quantitative weight, speed speed controlling value, offset) input from keyboard (or dial switch) (7).After pressing down execute key (6), empty bucket tare weight is removed by bales catch, micro computer makes vibro-feeder (13) drive vibra shoot (12) judder by umbilical cable (16), so the material in the hopper (11) enters in the pail pack fast, increase along with weight, sensor output signal increases, the displayed value of computer balance (1) also increases, when numerical value reaches the value at a slow speed of setting, shake a little less than the vibro-feeder, material enters at a slow speed in the bucket, when arriving the net weight value of setting, vibro-feeder stops vibration, control signal makes solenoid valve (14) action by cable (17), and cylinder (15) stretches out under the pressurized air effect, and bucket is released, the release rear electromagnetic valve resets, cylinder is indentation again, enters barrel mechanism and the empty bucket of the next one is put into carries out automatic weighing on the weighing platform again.Above-mentioned topworks's action all can be by automatic control scale control, and panel leds (3) has been indicated topworks's state, and digital indicator (4) shows accumulative total barrelling number and shows the cumulative weight value.

Fig. 4 is the application (this illustration figure be two kind material batchings) of the utility model on the automatic blending scale.These burden balance are bunker scale, and this scale has a hopper (26), two feed storehouses (22), two helical feed loaders (23).Because bucket capacity reaches the reasons such as structure of discharge door (29) greatly and can not be contained on the computer balance weighing platform, this example is lifted on hopper on the support in the factory building by one group of load-bearing lever (28), and one group of force transferring lever (25) passes to weight sensor (21) (this sensor can be pulled down) with power in the weighing platform of computer balance.Change lever ratio, the power that sensor is subjected to changes in proportion, and the range of computer balance is enlarged.Automatically control scale (19) by electric control box (20) control helical feed loader fast, feed and stopping at a slow speed, control discharge door cylinder (27) is flexible with the keying discharge door.Airborne dust when cloth bag (24) both can prevent feed can avoid weigher to be subjected to the influence of loader deadweight again.

(30) are common computer scale shows signal delivery outlet in the accompanying drawing 1, and (31) are above-mentioned signal driver, in order to the digital display screen (32) of lighting the common computer scale.(33) be the slice microcomputer host circuit that is provided with for expansion common computer scale function, it can be according to the setting valve and the actual displayed value of weighing of dial digital switch or keyboard (35) input, the corresponding actuating of relay in the pilot relay battle array (36), drive feed, the action of discharge topworks, also with relevant data such as aggregate-value, batch show and printer prints by display (34).

Claims (2)

1, controls scale automatically and form, it is characterized in that microcomputer has the interface that can accept computer balance numeral font signal by common computer scale, microcomputer expanding system.

2, interface according to claim 1 is characterized in that the most significant digit of computer balance display strobe pulse and the interrupt bit INT of micromachine system join.

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