The pipe tobacco strength is carried on-line control system
Technical field
The utility model belongs to cigarette machine control technology field, is specifically related to the control system of wind speed on a kind of pipe tobacco strength pipeline.
Background technology
In the prior art, send on the operation at pipe tobacco wind, its master operation task is that eliminating stems is signed, its important indicator is the selection by winnowing indoor air velocity, requires just to reach the requirement that eliminating stems is signed feeding tobacco-thread about 4m/s, and wind speed is too high, can not select foreign material, wind speed is low excessively, and band is not walked material.But in actual production process, this wind speed often will could guarantee by adjusting because of the whole system factor constantly changes.For example, when dust-removal cloth-bag change in resistance or system leak out, all influence selection by winnowing speed inevitably,, will occur that wind speed is too high to be made broken big or wind speed and cross low strap and do not walk two kinds of failure conditions of material when regulating when untimely.The regulative mode of prior art is to become valve control, promptly relies on the maintenance personal that the aperture of the machinery valve on the centrifugal blower intake stack is carried out manual adjustments, reaches to change the purpose that the interior pipe tobacco wind of pipeline send speed.This regulative mode exists following shortcoming:
1 ambiguity: because the difference of pipe tobacco classification, also slightly different according to the moisture in cut tobacco that production technology processes, be that wind send varying in weight of particle, this moment, corresponding conveying air velocity was also different, the size of wind speed can only lean on people's sense organ to judge, the concrete index of neither one is weighed the quality that wind send.
2 operability are poor: it generally is to carry out under the situation that blower fan is opened that the manual air door of prior art is regulated, and the big maintenance personal of windage regulates inconvenience, and wind speed range is difficult for holding.
3 unstability: because the difference of pipe tobacco classification send requirement also different to wind.Under the constant situation of air door the duty of equipment change (dust-removal cloth-bag is airtight, the web plate obstruction of selection by winnowing chamber etc.) also can bring change of wind velocity.
4 energy consumptions are big: because air door will regulate, so the aperture of air door can standard-sized sheet, generally between 70%~90%, but the power of blower fan is constant substantially, thereby exist the phenomenon of empty consuming electric power, and the general power ratio of fan-type equipment is bigger, brings a large amount of waste of energy.
The utility model content
At the above-mentioned deficiency of prior art, the technical problems to be solved in the utility model provides a kind of pipe tobacco strength and carries on-line control system, and native system changes the operating frequency of power supply by frequency converter, thereby realizes the stepless speed regulation to alternating current generator.When blower fan adopted speed change to regulate, its efficient was almost constant, and flow changes by the first power rule with rotating speed, and shaft power changes by the cube rule.Adopt variable frequency adjustment simultaneously, can reduce the noise of blower fan, alleviate wearing and tearing, increase the service life.
The technical solution of the utility model is: the pipe tobacco strength carries the anemobiagraph of on-line control system to be arranged on the selection by winnowing case of pipe tobacco strength pipeline and the wind between the material separator send in the pipeline, the output of anemobiagraph links to each other with the input of Programmable Logic Controller PLC, be connected with frequency converter on the motor of blower fan, frequency converter links to each other with the equipment control bus by communication module, the equipment control bus links to each other with Programmable Logic Controller PLC, and Programmable Logic Controller PLC also links to each other with industrial computer.Described frequency converter is a 1336PLUS II frequency converter, and described communication module is the 1203-GK5 communication module.
The utility model is reasonable in design, and is simple in structure, and effect is remarkable, changes the operating frequency of power supply by frequency converter, thereby realizes the stepless speed regulation to alternating current generator.Adopt variable frequency adjustment, can reduce the noise of blower fan, alleviate wearing and tearing, increase the service life.
Description of drawings
Accompanying drawing 1 is the device structure schematic diagram of the utility model embodiment;
Accompanying drawing 2 is the utility model control system block diagrams.
Accompanying drawing acceptance of the bid keep the score state as follows: 1-wind send pipeline; 2-selection by winnowing case; The 3-material separator; 4-pipe tobacco collecting box; The 5-deduster; The 6-blower fan; The 7-anemobiagraph; The former mechanical air door of 8-installation place; The 9-PLC Programmable Logic Controller; The 10-industrial computer; The 11-1203-GK5 communication module; 12-1336PLUS II frequency converter; 13-equipment control bus.
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present utility model is described in further detail.Shown in accompanying drawing 1,2, on the ventilation shaft 1 that pipe tobacco wind send, increase anemobiagraph 7, anemobiagraph 7 has the numeral demonstration and carries analog quantity (4~20mA) outputs, and the return air wind speed changed into the materail tube wind speed, at pipe tobacco selection by winnowing case 2 places display gauge head is installed and is accurately shown air speed data, the 1336PLUS II frequency converter 12 of AB company is selected in blower fan 6 frequency conversion transformations for use.1336PLUS II frequency converter 12 provides very simple parameters setting and operation, control method novelty, applying flexible and function brilliance.
1336PLUS II frequency converter 12 is realized the control to motor by workshop existing equipment control bus 13 and PLC9 communication, can read a large amount of procedure parameters such as frequency converter status word, running frequency, frequency converter temperature and current of electric; Simultaneously, also realized to motor remote activation, stop the real-time control with frequency.Use network communication to have following advantage than traditional control mode: wiring quantity reduces, the data of gathering frequency converter are many, and the device control network that antijamming capability is strong is used for being connected between simple, industrial equipment (as frequency converter, sensor etc.) and the sophisticated equipment (as controller).Measured control domain technology, this open network provides the interoperability between many vendor equipment, comprising the communication of 1336PLUS II frequency converter 12.Pipe tobacco wind pressure fan control is connected with 1756-DNB template in the main control PLC pedestal by 1203-GK5 communication module 11 with frequency converter among the utility model embodiment, carries out communication with ControlLogix5555.More than 300 parameter of 1336PLUS II frequency converter inside can be watched or revise to this kind control mode by corresponding programming software, can obtain by the data acquisition of equipment control bus network as the electric current of motor, temperature, rotating speed etc., only need that a long-range change parameter get final product on control room touch-screen or monitoring equipment.Pipe tobacco wind pressure fan 6 has obtained intelligent control by 1336Plus II frequency converter 12.Blast system also has been incorporated on the original centralized control system in workshop by this transformation simultaneously, has reduced manual intervention, has improved automation degree of equipment.
Pipe tobacco wind pressure fan adopts Frequency Converter Control after the system reform, the wind speed of expectation is set on monitoring equipment by operating personnel, carry out the PID computing by PLC, operation result is exported to frequency converter by equipment control bus network, the control rotation speed of fan, come online detection actual wind speed by anemobiagraph then, thereby the data that record are passed to the rotating speed that PLC revises blower fan in real time, carry out accurate, the control flexibly of wind speed.
After the system hardware transformation is finished, in that we have been the contrast experiment to the broken rate of pipe tobacco and the relation between the wind speed on the new air-transport system, experimental selection pipe tobacco wind send between speed 15m/s-22m/s and carries out, and along with the increase of conveying air velocity, the degree of fragmentation of pipe tobacco is to increase rapidly.Otherwise conveying air velocity is low more, the degree of fragmentation relative ideal of pipe tobacco.But in experiment, when selecting conveying air velocity<15m/s for use, have sometimes a little qualified pipe tobacco can be in selection by winnowing disallowable settling.So conveying air velocity the best is selected scope 〉=15m/s for use, but for keeping the stability of air-transport system, overcome the influence because of the big minor swing of pipe tobacco chopping in the production process, for production safety and convenient operation and control, getting conveying air velocity 15.5m/s-16.5m/s is optimal value.In test, the percentage of damage of not finding pipe tobacco is along with the change of delivery ratio has obvious variation.The pipe tobacco air-transport system is after adopting PLC technological transformation and parameter optimization; system obviously speeds the adjusting time; because it is suitable that wind send parameter to select; whole air-transport system operating ratio is more steady; when producing system change; also can in time reach the requirement of operation wind speed, because of the blast system fault effects obviously reduces downtime.Particularly gratifying is pipe tobacco wind sent to transform to be incorporated in the centralized control system of workshop the back operating personnel and can easily to regulate wind according to practical condition and send speed, found out the control experience of a cover oneself aborning.The material situation of picking out from the selection by winnowing chamber: how, pipe tobacco had lacked, and wind send the moisture loss at two also to fluctuate little than before before foreign material and stalk head were transformed.Production efficiency and tobacco quality are greatly improved.Because air-transport system also has numerous cigar mills to use at home, also have other strength to carry as tobacco leaf, offal, expansion thread, thereby apply the PLC converter technique, transform original system, and constantly grope to sum up best wind and send parameter can obtain tangible economic benefit and social benefit.