CN1035133C

CN1035133C - Weighing control circuit of electronic constant weight packaging scale

Info

Publication number: CN1035133C
Application number: CN93109770A
Authority: CN
Inventors: 柳祖翼
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-08-16
Filing date: 1993-08-16
Publication date: 1997-06-11
Anticipated expiration: 2013-08-16
Also published as: CN1099134A

Abstract

The present invention relates to a weighing and packing control circuit of a quantitative electronic batch scale, which belongs to the technology of controlling the weighing and packing of packing machinery. The present invention is characterized in that the present invention is composed of a meter connected to the output terminal of a weighing sensor, a dialing disc for setting the prevalue of the gross weight, a dialing disc for setting the trimming value of the gross weight, two adders, a photocoupling type isolating circuit connected with the carry output terminals of the two adders, and a control relay connected with the output terminal of the isolating circuit, wherein one input terminal of each of the adders is connected to the output terminal of the meter, and the other input terminals of the adders are respectively connected to the output terminals of the dialing disc for setting the prevalue of the gross weight and the dialing disc for setting the trimming value of the gross weight by a set of inverter.

Description

The Bao Chong of the electronic constant packaging scale operation circuit of weighing

The Bao Chong of the electronic constant packaging scale operation circuit of weighing belongs to the control technology field of weighing of electronic type weighing apparatus.

Quantitatively packing process generally is made up of feeding, three parts of weighing and pack.The Bao Chong of electronic constant packaging scale weighs and wants a large amount of chargings guaranteeing packing speed when control technology promptly begins after fast before requiring slowly, is wanting when the phase, bag was heavy near giving that feeding is to guarantee the precision of Bao Chong in a small amount, and the existing speed of ability have precision again like this.A kind of method is to achieve the above object by controlling rate of feeding stage by stage, as being divided into high, medium and low third gear to rate of feeding, set respectively corresponding to the voltage analog under the various speed, in packing process, as long as switch the purpose that given magnitude of voltage can reach the speed change feeding, with speed that guarantees packing and the precision of weighing.The general AC frequency conversion speed regulator that adopts realizes that its shortcoming is the bad adaptability to the different size material, and the final stage rate of feeding can not design very lowly.Thereby influence precision, and price is higher.Another kind method is heavily to come piecewise control bin gate aperture to realize above-mentioned purpose according to actual material under the constant condition of rate of feeding.Bao Chong gives the value of putting and trim values, the general assembly (TW) that its summation is promptly wrapped as can be divided into.When the packing beginning, the bin gate standard-sized sheet.When actual material heavily equals to give when putting material and heavily being worth, close the gate, open wicket, slow blanking until the weight of material of feeding from wicket is closed wicket when equaling to expect heavy amount trimmed again, enters wrapper.The advantage of this method is: precision height, cost are low.More than two kinds of methods also can realize by computing machine.But complex structure, maintenance difficult, cost is higher, and anti-interference is also poor.

Purpose of the present invention just is to provide a kind of and fixs by the heavy and corresponding bin gate aperture of the actual material of control stage by stage employed a kind of fully with the Bao Chong of the electronic constant packaging scale of the hardware formation operation circuit of weighing when guaranteeing that packing speed and bag weigh precision at rate of feeding one.

Feature of the present invention is: the gauge outfit 2 that it is linked to each other by the output terminal with LOAD CELLS 1, the value of putting of giving of general assembly (TW) is set dial 3, the trim values of general assembly (TW) is set dial 4, another input end of the output terminal of an one input end and gauge outfit 2 and its through phase inverter 5 respectively with general assembly (TW) give the value of putting setting signaling dish 3, the trim values of general assembly (TW) is set two continuous totalizers 6 of each output terminal of dial 4, the photoelectricity that links to each other with the carry output terminal of above-mentioned totalizer 6 respectively coupling buffer circuit 7 with and pilot relay 8 compositions that link to each other with the output terminal of above-mentioned buffer circuit 7 of coil input end, its block diagram is seen Fig. 1.

Use proof: the Bao Chong that electronic constant packaging scale provided by the invention is used weighs, and operation circuit packing speed is fast, weighing precision is high, hardware is simple and reliable and cost is low, antijamming capability strong, maintenance is easy to adjust.

In order in conjunction with the embodiments the present invention to be described in detail below, now as follows employed accompanying drawing title of present specification and numbering brief introduction:

Fig. 1: the Bao Chong that the electronic constant packaging scale the is used operation circuit block diagram of weighing;

Fig. 2: the electronic constant packaging scale Bao Chong operation circuit circuit diagram of weighing;

Fig. 3: gauge outfit wiring diagram;

Fig. 4: the wiring diagram that gives the value of putting setting dial of general assembly (TW);

Fig. 5: the trim values of general assembly (TW) is set the wiring diagram of dial.

Embodiment:

Ask for an interview Fig. 2～5.Totalizer 6 has two groups, all is four totalizers, all uses chip 74LS283 to form.First group by chip U ₁～U ₄Form, second group by chip U ₅～U ₈Form.6,2,15,11 4 one group of one group of input end of first group of totalizer ground respectively with the output terminal B that gives the value of putting setting dial 3 of the general assembly (TW) that constitutes with chip 20PIN ₁～B ₁₅By one group of phase inverter F ₁～F ₁₅Link to each other, one group of input end 6,2,15,11 of second group of totalizer also is dial 4 is set on four one group ground respectively with the trim values of the general assembly (TW) that constitutes with chip 20PIN output terminal D ₁～D ₁₅By one group of phase inverter F ₁～F ₁₅Link to each other.Another output terminals A direct and gauge outfit 2 of using chip 20PIN formation of these two groups of totalizers with organizing 5,3,14,12 four one group of input end ₁～A ₁₅Link to each other.In each group totalizer, everybody chip is in series by the carry end, and the carry input of its lowest order is by current-limiting resistance R ₁With power supply U _CcJoin, the carry output terminal of its most significant digit is by phase inverter F ₁₇Link to each other with the input end 2 of the photoelectric isolating circuit 7 that constitutes with chip 113, the output terminal 5 of this buffer circuit 7 links to each other with the coil input end of pilot relay 8 and altogether.

R ₂It is stake resistance.In Fig. 2, general assembly (TW) is given the value of putting and is set output terminal that dial code-disc 3 and general assembly (TW) trim values set dial 4 and also can link to each other with the input end of totalizer 6 separately, but this moment dial setting value be the radix-minus-one complement of true value, need only the power supply reversal connection of dial.Give the numerical value of putting weigh dial and fine setting dial and can adjust packing speed and degree makes it reach optimum condition.

Before starting working, on dial, give earlier put general assembly (TW) give the value of putting and trim values.Make its summation equal the Bao Chong of the phase of giving.In the course of the work, when actual material heavily equals to give the value of putting, the chip U of first group of totalizer ₄The carry output terminal signal output is just arranged, go to change the bin gate aperture by photoelectric isolating circuit 7 deactivation pilot relays and enter less reinforced process.When the material that adds for the second time equals the trim values of general assembly (TW), the chip U of second group of totalizer ₈The carry output terminal signal output is just arranged, by the corresponding photoelectric isolating circuit 7 deactivations pilot relay corresponding with it to close bin gate, the also corresponding end of bag weight weighing process.

Claims

1. the Bao Chong of the electronic constant packaging scale operation circuit of weighing, it is characterized in that: it is by the gauge outfit (2) that links to each other with LOAD CELLS (1) output terminal, the value of putting of giving of general assembly (TW) is set dial (3), the trim values of general assembly (TW) is set dial (4), input end link to each other with the output terminal of gauge outfit (2) and another input end each through a phase inverter (5) respectively with above-mentioned two dial (3), (4) two totalizers (6) that output terminal links to each other, photoelectricity coupling buffer circuit (7) that links to each other with the carry output terminal of above-mentioned two totalizers (6) respectively and the pilot relay (8) that links to each other with above-mentioned buffer circuit (7) output terminal are formed.

2. the Bao Chong of the electronic constant packaging scale according to claim 1 operation circuit of weighing is characterized in that: described two totalizers (6) all are four totalizers forming with chip 74LS283.

3. the Bao Chong of the electronic constant packaging scale according to claim 1 operation circuit of weighing is characterized in that: the value of putting of giving of general assembly (TW) is set the trim values of dial (3) and general assembly (TW) and is set the output terminal of dial (4) after reversal connection power supply formation radix-minus-one complement and also can be directly link to each other with the input end of separately totalizer (6).