CN2793706Y - Electronic balance with high-precision batching - Google Patents
Electronic balance with high-precision batching Download PDFInfo
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- CN2793706Y CN2793706Y CN 200520023929 CN200520023929U CN2793706Y CN 2793706 Y CN2793706 Y CN 2793706Y CN 200520023929 CN200520023929 CN 200520023929 CN 200520023929 U CN200520023929 U CN 200520023929U CN 2793706 Y CN2793706 Y CN 2793706Y
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Abstract
The utility model relates to a high-precision batching electronic scale, which belongs to the technical field of measurement and the utility model is used for solving the ambivalent problem of high efficiency and high precision in aspect of batching. The utility model adopts the technical scheme that the utility model comprises a batching hopper, a delivery auger and a DC driving motor which are matched with the batching hopper, a mixed hopper, a weighing sensor, a switching mixed hopper door mechanism and a control circuit, wherein the control circuit is provided with a PLC programmable controller; each auger shaft is provided with a speed measuring sensor, and the output end of each speed measuring sensor is connected with a data input port of the PLC programmable controller; signals of the weighing sensor and two travel switches of a switching mixed hopper door are respectively connected with the signal input end of the PLC programmable controller; besides, pulse-width modulation signals output by the PLC programmable controller are amplified by a speed regulating signal amplification circuit and then control the DC driving motor. The PLC programmable controller can output the different pulse-width modulation signals according to batching processes so as to regulate the rotary speed of the driving motor for the hopper so as to achieve the accurate control of material weight.
Description
Technical field
The utility model relates to the electronic scales of a kind of accurate control material weighing and proportioning, belongs to field of measuring technique.
Background technology
In commercial production, how to realize that efficient, the high precision mixing match of multiple powdery or granular material is that manufacturing enterprise is concerned about always, also be the difficult problem that each burden balance manufacturer is faced.The solution that present general burden balance are taked has two kinds, first kind is all to be furnished with an auger and drive motor under several material hoppers of needs batching, start and stop by weight sensor control motor realize batching, and the drive motor invariablenes turning speed, if motor speed setting value height, the speed of then preparing burden is fast.The major defect of this method is that because inertia also still can feed by some material, this part unnecessary material is called " drop " send the stall instruction after system receives sensor " weight reaches " signal after.In order to reduce " drop ", need system to stop the auger drive motor in advance.But in actual production, if guarantee batching speed, higher motor speed is set, then the lead of drive motor stall is difficult to hold, and " drop " is bigger; And if guarantee proportioning accuracy, reduce rotating speed, then lead is easy to control, " drop " can reduce, but batching speed will reduce, both contradictions are difficult to unified.Second method takes to install one fast one slow two augers under each hopper, when convey materials shortage in weight setting value 80% the time, two augers are all worked, when meeting or exceeding 80%, then fast conveying auger quits work, and is finished the conveying of leftover materials by conveying auger at a slow speed.Though this method and first method specific rate and precision mutually all can improve, each hopper is all installed two augers, and its cost has increased, so the solution of " drop " problem is still undesirable.
Summary of the invention
Technical problem to be solved in the utility model provides and a kind ofly can adopt an auger under each hopper and still can realize efficient, the high precision batching electronic scale of accurate feed proportioning.
The technical scheme that addresses the above problem is:
A kind of high precision batching electronic scale, it comprises the batching hopper, with supporting conveying auger and the direct-drive motor of batching hopper, the batch mixing bucket, LOAD CELLS, switch batch mixing sluice gate mechanism and control circuit, its improvements are, described control circuit adopts the PLC programmable controller, on each screw-conveyer-shaft, tachogenerator is installed, the output terminal of tachogenerator is connected with the data-in port of PLC, the analog quantity input port of the output termination PLC of described LOAD CELLS, two travel switch signals of described switch batch mixing sluice gate, be connected with the signal input part of PLC respectively, PLC output pulse width modulation signal, its output port is connected with the speed-regulating signal amplifying circuit, and the output of speed-regulating signal amplifying circuit connects direct-drive motor.
Above-mentioned high precision batching electronic scale, described speed-regulating signal amplifying circuit is made up of triode Q1, Q2, wherein triode Q1 and resistance R 1, R2, R3, R4 are connected into the emitter output circuit, the base stage of Q1 connects the port of PLC output pulse width modulation signal, triode Q2 is connected into amplifying circuit, and its base stage is connected on the emitter of Q1, the grounded emitter of Q2, direct-drive motor is a collector load, the normally opened contact of serial connection pilot relay in direct-drive motor and collector loop.
Above-mentioned high precision batching electronic scale, the foil gauge resistance of described LOAD CELLS is connected into electric bridge check weighing circuit, its output terminal connects an amplifying circuit, amplifying circuit is made up of differential amplifier circuit and output amplifier, described differential amplifier circuit is by transport and placing device A1, A2 constitutes, wherein, resistance R 5 is the current-limiting resistance of transport and placing device A1 positive terminal, resistance R 7 is a feedback resistance, resistance R 0 is the shared resistance of negative phase end, the circuit of transport and placing device A2 constitutes identical with A1, transport and placing device A1, the output of A2 is respectively through resistance R 9, R11 connects the input end of output amplifier, described output amplifier transport and placing device A3 constitutes, and the output terminal of transport and placing device A3 connects the analog quantity input port of PLC.
Above-mentioned high precision batching electronic scale, described switch batch mixing sluice gate mechanism is made up of solenoid valve 13 and cylinder 14, the fixing collision block that triggers on the piston rod of cylinder, the corresponding respectively position that puts in place of triggering open and close door in the collision block stroke of limit switch XK1, XK2.
Adopt the high precision batching electronic scale of this structure, can export the distinct pulse widths modulation signal by the weight that PLC finishes according to batching, the rotating speed of direct-drive motor with the control hopper, realization is to the accurate control of batching output weight, not only solved " drop " problem in the batching, and the device fabrication cost does not increase.
Description of drawings
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;
Fig. 3 is the operation main program block diagram;
Fig. 4 is a speed governing subroutine block diagram.
1,5,9. direct-drive motor respectively is labeled as among the figure:; 2,6,10. auger; 3,7,11. hoppers; 4,8,12. tachogenerators; 13. solenoid valve; 14. cylinder; XK1. the scale door reaches a travel switch; XK2. the scale door closes the travel switch that puts in place; 17. batch mixing bucket; 18. LOAD CELLS, KH. automatic/hand change-over switch signal; KQ. system program enabling signal; KT. system program stop signal; S1. No. one auger tach signal; S2. No. two auger tach signals; S3. No. three auger tach signal, J1～J5. relay.
Embodiment
Embodiment from Fig. 1 can see, the utility model comprises 3 hoppers 3,7,11, hopper is installed conveying auger 2,6,10, direct-drive motor M1, M2, M3 (controlled it and whether connected by the corresponding contact J1-1 of relay, J2-1, J3-1) and tachogenerator 4,8,12 for 3,7,11 times respectively, it also is provided with batch mixing bucket 17, LOAD CELLS 18, switch batch mixing sluice gate mechanism, and they are connected with the control device PLC programmable controller of electronic scales respectively.
Fig. 2 shows that the signal output part of two travel switch XJ1, XJ2 of the signal output part of 3 tachogenerators 4,8,12, switch batch mixing sluice gate, automatic/hand change-over switch signal output part KH, system program start stop switch signal output part KQ, KT are connected with 10.0～10.7 input ports of PLC respectively; Pilot relay J1, the J2 of 3 direct-drive motors, J3, the solenoid control of opening the door relay J 4, the warning output relay J5 that weighs then are connected with Q0.2～Q0.6 output port of PLC respectively.The tach signal of 3 augers 2,6,10 among the figure, pulse encoder by the tachogenerator 4,8,12 that is installed on the auger afterbody sends one group of pulse signal relevant with auger speed, PLC counts the pulse signal that receives in the unit interval, just can calculate the rotating speed of auger.The scale door switch signal that puts in place is the switching value signal that is sent by two travel switch XK1, XK2 that door-opening mechanism triggers.When the scale door reaches, trigger collision block and the contact of travel switch XK1 can be depressed, send signal to PLC, expression " is opened the door and is put in place "; When scale door pass put in place, this collision block can be depressed the contact of another travel switch XK2, and the signal that sends is expression " door-closing in-place ".The automatic/hand switching signal, this is the switching value signal that is sent by the turn-knob on the guidance panel, is used for user's initialization system and is operation automatically or need manual intervention.System program starts and stop signal, and this also is the switching value signal that is sent by the knob on the guidance panel, is used for the work of user's startup and halt system.
The PWM pulse-width signal of PLC is in the output of Q0.0 port, and this port is connected with the speed-regulating signal amplifying circuit, the rotating speed of speed-regulating signal amplifying circuit control direct-drive motor M1, M2, M3.
LOAD CELLS 18 is powered by a constant pressure source, and purpose is the work of stabilizing circuit.The detection signal of LOAD CELLS 18 is received the analog quantity input port A of PLC.Add constant pressure source for the input end of LOAD CELLS 18, its output terminal just has electric signal output, if the load of sensor changes, corresponding variation also can take place in the electric signal of sensor output terminal, this electric signal is through amplifying, input to the analog quantity input port A of PLC, be translated into the corresponding digital amount by PLC.
Operating process of the present utility model as shown in Figure 3.
When PLC after the system power-up immediately the startup knob on the detecting operation panel whether press, if by next continuation inquiry; Start knob and press if inquire, then require the user to import prescription and carry out the necessary parameter setting.
Whether the prescription that the user imported of PLC detection has subsequently exceeded the scope of electronic scales institute energy measurement, if transfinite, control system can the alarm user be re-entered; If prescription is normal, then start the direct-drive motor M1 of No. one auger 2, make No. one auger 2 feedings.When No. one auger 2 feedings, LOAD CELLS 18 detects the weight of material that falls in the batch mixing bucket 17 in real time, and weight signal is sent among the PLC in real time.
When PLC judge No. one material in the hopper 3 according to prescription require 100% ground to send into hopper the time, output signal makes direct-drive motor 1 outage of No. one auger, No. one auger 2 quits work.Start the direct-drive motor M2 of No. two augers 6 then, repeat said process then, all finish by prescription requirement feeding until all hoppers.
After material was all sent in the batch mixing bucket 17, PLC provided the power on signal of the solenoid valve 13 that opens the door, and pressurized air enters cylinder 14 ante-chambers by the solenoid valve 13 that opens the door, and made the piston rod withdrawal of cylinder, drove electronic scales bottom gate and opened, and material falls.When PLC detects material and has all fallen by LOAD CELLS 18 after, make solenoid valve 13 outages, pressurized air enters the back cavity of cylinder 14, and the piston rod of cylinder is stretched out, and drives closing gate.It is not in place for the action that prevents door-opening mechanism that the scale door reaches the effect that a travel switch XK1 and scale door close the travel switch XK2 that puts in place, causes unnecessary loss to the user.
Behind closing gate, stopping knob and whether press on the PLC detecting operation panel, if press, then system quits work, otherwise, start the direct-drive motor M1 of No. one auger 2, enter next working cycle.
The utility model is in order to solve batching high precision and high-speed harmony problem, and design is by PLC control electrical motor gearshift.At 90% o'clock of convey materials shortage in weight setting value, auger was a maximum (top) speed, and it is high-speed to have guaranteed that material adds; When the weight of convey materials surpass setting value 90% the time, the control auger is reduction of speed progressively, convey materials weight is more near 100%, the auger rotating speed is slow more, stops when satisfying setting weight.Adopt this method to make to arrive the residual material quantity and the momentum minimum of generation thereof of moment in the pipeline before the setting weight value, thereby guaranteed the high precision that material adds in theory.
Idiographic flow as shown in Figure 4, PLC adopts pulse width modulation mode control speed change, the pulse-width signal dutycycle difference of the PLC output then rotating speed of drive motor is also different.In the feeding incipient stage, the PLC output duty cycle is 100% pulse-width signal, and direct-drive motor drives the auger feeding with maximum (top) speed; Weight in LOAD CELLS detects the scale bucket is 90% o'clock of setting weight, and the pulse-width signal dutycycle of PLC output reduces to 90% at once, and then the rotating speed of motor is also reduced to 90% of maximum (top) speed; Weight in LOAD CELLS detects the scale bucket is 91% o'clock of setting weight, and the pulse-width signal dutycycle of PLC output reduces to 80% at once, and then the rotating speed of motor is also reduced to 80% of maximum (top) speed; Then, the every increase by 1% of weight, dutycycle reduces 10%, and speed reduces to 0 just when arriving setting weight.Adopt this method to make to arrive moment before the setting weight residual raw material and momentum minimum of generation thereof in the pipeline, thereby guaranteed the high precision that material adds.
Claims (4)
1. high precision batching electronic scale, it comprises the batching hopper, with supporting conveying auger and the direct-drive motor of batching hopper, the batch mixing bucket, LOAD CELLS, switch batch mixing sluice gate mechanism and control circuit, it is characterized in that, described control circuit adopts the PLC programmable controller, on each screw-conveyer-shaft, tachogenerator is installed, the output terminal of tachogenerator is connected with the data-in port of PLC, the analog quantity input port of the output termination PLC of described LOAD CELLS, two travel switch signal XK1 of described switch batch mixing sluice gate, XK2 is connected with the signal input part of PLC respectively, PLC output pulse width modulation signal, its output port is connected with the speed-regulating signal amplifying circuit, and the output of speed-regulating signal amplifying circuit connects direct-drive motor.
2. high precision batching electronic scale according to claim 1, it is characterized in that, described speed-regulating signal amplifying circuit is made up of triode Q1, Q2, wherein triode Q1 and resistance R 1, R2, R3, R4 are connected into the emitter output circuit, the base stage of Q1 connects the port of PLC output pulse width modulation signal, triode Q2 is connected into amplifying circuit, its base stage is connected on the emitter of Q1, the grounded emitter of Q2, direct-drive motor is a collector load, the normally opened contact of serial connection pilot relay in direct-drive motor and collector loop.
3. high precision batching electronic scale according to claim 2, it is characterized in that, the foil gauge resistance of described LOAD CELLS is connected into electric bridge check weighing circuit, its output terminal connects an amplifying circuit, amplifying circuit is made up of differential amplifier circuit and output amplifier, described differential amplifier circuit is by transport and placing device A1, A2 constitutes, wherein, resistance R 5 is the current-limiting resistance of transport and placing device A1 positive terminal, resistance R 7 is a feedback resistance, resistance R 0 is the shared resistance of negative phase end, the circuit of transport and placing device A2 constitutes identical with A1, transport and placing device A1, the output of A2 is respectively through resistance R 9, R11 connects the input end of output amplifier, and described output amplifier transport and placing device A3 constitutes, and the output terminal of transport and placing device A3 connects the analog quantity input port of PLC.
4. high precision batching electronic scale according to claim 3, it is characterized in that, described switch batch mixing sluice gate mechanism is made up of solenoid valve [13] and cylinder [14], the fixing collision block that triggers on the piston rod of cylinder, the corresponding respectively position that puts in place of triggering open and close door in the collision block stroke of limit switch XK1, XK2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520023929 CN2793706Y (en) | 2005-04-22 | 2005-04-22 | Electronic balance with high-precision batching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520023929 CN2793706Y (en) | 2005-04-22 | 2005-04-22 | Electronic balance with high-precision batching |
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| CN2793706Y true CN2793706Y (en) | 2006-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200520023929 Expired - Fee Related CN2793706Y (en) | 2005-04-22 | 2005-04-22 | Electronic balance with high-precision batching |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102228195A (en) * | 2011-05-16 | 2011-11-02 | 江西省粮油科学技术研究所 | Technology and apparatus used before straight rice noodle extruding |
| CN102285528A (en) * | 2011-05-03 | 2011-12-21 | 勐海茶业有限责任公司 | Storage and distribution device capable of evenly feeding tea leaves |
| CN103406061A (en) * | 2013-08-12 | 2013-11-27 | 深圳市靶心配比科技有限公司 | Glue and powder automatic proportioning equipment for LED packaging |
| CN103940301A (en) * | 2014-05-12 | 2014-07-23 | 唐山学院 | Mixing weighing system of automatic firework production line |
| CN104061991A (en) * | 2013-03-21 | 2014-09-24 | 成都瑞途电子有限公司 | Automatic feedstock weighing device |
| CN107282873A (en) * | 2017-07-21 | 2017-10-24 | 李金平 | A kind of two-arm resin sand flow mixer control system |
| CN109292170A (en) * | 2018-11-29 | 2019-02-01 | 安徽信远包装科技有限公司 | A kind of single-station packing machine containing weighing device |
| CN115007268A (en) * | 2022-06-23 | 2022-09-06 | 吴停 | Animal doctor's medicine ratio is with smashing system to pieces |
| CN115920763A (en) * | 2023-03-15 | 2023-04-07 | 山东埃尔派粉体科技有限公司 | Automatic proportioning device for ultra-micro powder and implementation method thereof |
-
2005
- 2005-04-22 CN CN 200520023929 patent/CN2793706Y/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102285528A (en) * | 2011-05-03 | 2011-12-21 | 勐海茶业有限责任公司 | Storage and distribution device capable of evenly feeding tea leaves |
| CN102285528B (en) * | 2011-05-03 | 2013-01-23 | 勐海茶业有限责任公司 | Storage and distribution device capable of evenly feeding tea leaves |
| CN102228195A (en) * | 2011-05-16 | 2011-11-02 | 江西省粮油科学技术研究所 | Technology and apparatus used before straight rice noodle extruding |
| CN104061991A (en) * | 2013-03-21 | 2014-09-24 | 成都瑞途电子有限公司 | Automatic feedstock weighing device |
| CN103406061A (en) * | 2013-08-12 | 2013-11-27 | 深圳市靶心配比科技有限公司 | Glue and powder automatic proportioning equipment for LED packaging |
| CN103406061B (en) * | 2013-08-12 | 2015-12-30 | 深圳市靶心配比科技有限公司 | A kind of glue of LED and powder automatic mixing equipment |
| CN103940301A (en) * | 2014-05-12 | 2014-07-23 | 唐山学院 | Mixing weighing system of automatic firework production line |
| CN107282873A (en) * | 2017-07-21 | 2017-10-24 | 李金平 | A kind of two-arm resin sand flow mixer control system |
| CN109292170A (en) * | 2018-11-29 | 2019-02-01 | 安徽信远包装科技有限公司 | A kind of single-station packing machine containing weighing device |
| CN115007268A (en) * | 2022-06-23 | 2022-09-06 | 吴停 | Animal doctor's medicine ratio is with smashing system to pieces |
| CN115920763A (en) * | 2023-03-15 | 2023-04-07 | 山东埃尔派粉体科技有限公司 | Automatic proportioning device for ultra-micro powder and implementation method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |