CN117902342A - Method for automatically adjusting discharging frequency of feeding storage cabinet of control type electronic belt scale - Google Patents
Method for automatically adjusting discharging frequency of feeding storage cabinet of control type electronic belt scale Download PDFInfo
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- 241000208125 Nicotiana Species 0.000 description 15
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- 238000004519 manufacturing process Methods 0.000 description 5
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- 235000019504 cigarettes Nutrition 0.000 description 4
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Abstract
The invention discloses a method for automatically adjusting the discharging frequency of a feeding storage cabinet of a control type electronic belt scale, which comprises the following steps: (1) Calculating a limiting pipe filling redundant time T3 = limiting pipe discharging time T2-limiting pipe filling time T1; (2) Calculating the belt running distance in the filling time of the limit pipe to be B2=S1×T1, and calculating the linear speed of the S1 belt conveyor; calculating the ratio M=B2/B1 of the belt running distance of the belt conveyor at the discharging opening of the storage cabinet to the belt length of the discharging opening, wherein B1 is the belt length of the discharging opening of the storage cabinet; (3) Calculating the discharge redundancy S2=P1/T1 of the storage cabinet in unit filling time, wherein P1 is the set frequency of the discharge carried out by the bottom of the storage cabinet; (4) calculating the discharge redundancy of the storage cabinet p2=s2×t3; (5) Calculating the optimal discharging frequency P3=P1-P2×| (1-M) | of the storage cabinet, and automatically executing the optimal discharging frequency by the control program. The invention can adjust the discharging frequency of the feeding and storing cabinet of the electronic belt scale, and avoid the phenomena of frequent start and stop of equipment at the feeding end of the electronic belt scale or larger fluctuation of instantaneous flow of materials and the like caused by the high and low feeding speed.
Description
Technical Field
The invention belongs to the technical field of cigarette technology, and particularly relates to a method for automatically adjusting the frequency of a storage cabinet motor at a feed end for matching and controlling the process flow of an electronic belt scale.
Background
The procedures of feeding, perfuming, tobacco shred blending and the like on the cigarette shredding line are all provided with control type electronic belt scales (hereinafter referred to as electronic belt scales) which have the function of ensuring that materials can stably run according to set flow. The feeding of the electronic belt scale is completed by the storage cabinet, and the discharging speed of the storage cabinet determines whether the electronic belt scale can meet the requirement of stable control of the set flow. During production, operators carry out experience adjustment according to the storage amount of materials in the cabinet, in order to prevent the fluctuation of the flow of the electronic belt scale caused by insufficient feeding, the operators generally set the discharging frequency of the storage cabinet to be larger, so that the associated equipment at the feeding end of the electronic belt scale is easy to start and stop frequently, and even the feeding hole of the storage cabinet or the feeding hole of the electronic belt scale can be blocked. Therefore, if the discharging frequency of the storage cabinet can be automatically and accurately adjusted, the starting and stopping times of the equipment can be effectively reduced, and the occurrence of the blocking condition can be avoided. At present, no report exists in the domestic tobacco industry on a method for automatically adjusting the discharging frequency of a storage cabinet, and a new method is necessary to solve the problem of feeding matching of an electronic belt scale.
Referring to fig. 1, the material feeding mode of the electronic belt scale is as follows: when the material in the storage cabinet 2 falls down from the feed opening 3, the material is conveyed to the feed belt 5 of the electronic belt scale through the feed opening belt 4, the material naturally falls into the limit pipe 10 of the electronic belt scale through the feed bin 6 at the upper end of the electronic belt scale, if the detection signal of the feed bin photoelectric tube 8 continuously detects the material for a certain time, the blocking alarm information is sent out, the material feeding amount in the limit pipe of the electronic belt scale is controlled by the signals of the high-material-level photoelectric tube 9 and the low-material-level photoelectric tube 11, when the material level reaches the high-material-level photoelectric tube 9, the equipment at the feed end temporarily stops running, when the material level is lower than the low-material-level photoelectric tube 11, the equipment at the feed end resumes running, after the material falls onto the surface 13 of the electronic belt scale, the material runs along with the running direction of the belt, and after the material is pressed by the shaping roller 14, the material runs to the discharge opening 15 of the belt scale to enter the next procedure.
CN115303818a discloses a flow control system for wire making line anti-blocking material, adjusts the conveyor belt speed through the controller, and the material monitoring device can carry out the secondary monitoring to the material in the quantitative pipe, according to the monitoring result of secondary, adjusts the conveyor belt through the controller, prevents that the horn feed inlet of quantitative pipe from causing the blocking material because of after the material gets into in a large number in the short time, and the ejection of compact is untimely. But the method lacks the linkage adjustment of the discharging speed of the storage cabinet and the flow demand of the electronic belt scale.
Analysis and control of operation stability and metering reliability of electronic belt scale (Sun Lu et al, 2018, 02) in this document, by improving the control method of the limit tube material level of electronic belt scale, replacing the photoelectric tube with the grating, improving the structure of the material baffle plates at two sides of the electronic belt scale, and adopting the wedge-shaped material baffle plate to eliminate the extrusion phenomenon. And finally, under the working condition of 2000kg/h of set flow, the actual flow fluctuation range of the material is increased from +/-10 kg/h to +/-4 kg/h. Although the accurate detection of the material height of the storage cabinet is realized, the problem of extrusion of the material on the belt scale is relieved, but the accurate control of the discharge speed of the storage cabinet cannot be realized.
CN110663330a discloses a crop fertilizing device for adjusting discharge amount by controlling opening and closing frequency, which controls the operation of a moving rod by a gear transmission principle, and realizes the position control of a baffle plate, thereby achieving the effect of adjusting discharge amount. The invention realizes material quantity control by adjusting the size of a feed opening, and does not relate to the field of control of feed flow of an electronic belt scale.
The influence of the discharging speed on the tobacco shred structure and the cigarette quality (Tian Qiusheng et al, scientific and technological information, 2011, 27 th period) is discovered in the text through the test and analysis of the influence of different discharging speeds of a tobacco shred storage cabinet on the cigarette quality: the discharging speed is too high or too low, and the quality of cut tobacco is easily reduced. In the test range, when the discharging speed of the tobacco storage cabinet is 19.6m/h, the tobacco shred quality is the best. The research shows that the optimal discharging speed of the wire storage cabinet is obtained, and the field of control of the feeding flow of the electronic belt scale is not related.
By comparing with the traditional storage cabinet discharging control mode, the research on the discharge speed of the storage cabinet based on grating control (Lai Lin and the like, automation application and the 10 th period of 2018) is disclosed, a MINI ARRARY grating detection system is utilized to monitor the height change of materials during the discharge of the storage cabinet in real time, and the frequency of the bottom belt of the storage cabinet is adjusted in real time, so that the flow stability of the materials in the whole production process is ensured. The study considers the material quantity in the storage cabinet and controls the discharging frequency through the grating detection result, but the study is limited to the control of the discharging of the storage cabinet and is not related to the flow of the electronic belt scale.
The method for loading the minimum load to each proportioning electronic belt scale in advance is introduced on the basis of perfecting the PLC control program of the blending area and taking part in the control of the production starting stage (Zhuo Yue, shuoshi university, xiamen university, 6 th year), so as to solve the problem that the blending material is seriously lost in the tobacco shred blending starting stage (namely, the stub bar stage). The core of this research is to solve belt scale stub bar stage material defect problem, belongs to the research field of material blending accuracy.
CN219602526U discloses a device for shaping and blanking and refining tobacco before a tobacco flavoring machine, in order to solve the problem that the flow of material entering the flavoring machine is unstable, tobacco shreds fall down because of the height of fall to produce the broken tobacco shreds, a stirring shaping unit connected between an electronic belt scale and a feeding belt conveyor is designed and installed, and the tobacco shreds are subjected to material homogenizing and shaping by a stirring roller, so that the tobacco shreds are uniformly and evenly distributed in the middle of the belt conveyor for conveying. Although the flow stability problem of the feeding bin of the belt scale is solved, the flow research of the feeding end equipment is not further developed.
Disclosure of Invention
The invention aims to overcome the defects and provide a method for automatically adjusting the discharging frequency of a feeding storage cabinet of a control type electronic belt scale.
The control elements and related variables related to the invention are: setting a flow L (kilogram/hour) by the electronic belt scale; the electronic belt scale limits the filling time T1 (seconds); the discharging time T2 (seconds) of the electronic belt scale is limited; the electronic belt scale limits the filling redundant time T3 (seconds); the length of the belt at the feed opening of the storage cabinet is B1 (meter); the belt running distance B2 (meters) of the discharging opening of the storage cabinet; the linear speed S1 (meter/second) of the belt at the discharging opening of the storage cabinet; the storage cabinet discharging redundancy S2 (times/second 2) in unit filling time; the ratio M of the belt running distance of the belt conveyor at the discharging opening of the storage cabinet to the length of the belt at the discharging opening; setting the discharging frequency P1 (times/second) of the storage cabinet; storage tank redundancy P2 (times/sec); the optimal discharging frequency of the storage cabinet is P3 (times/second). The control method of the discharging frequency of the storage cabinet comprises the following steps:
1. the known electronic belt scale is provided with a set flow L (kilogram/hour), and the larger the set flow is, the larger the material supply amount is;
2. calculating the filling time T1 of the limit tube of the electronic belt scale according to the signal time of the high and low level detection photocells of the limit tube of the electronic belt scale, wherein T1=the closing time (photocell signal is 1) of the high level detection photocell and the empty opening time (photocell signal is 0) of the low level photocell;
3. According to the signal time of the high and low material level detection photoelectric tube of the limit tube of the electronic belt scale, calculating the discharging time T2 of the limit tube of the electronic belt scale, wherein T2=the time when the photoelectric tube with low material level is empty (the photoelectric tube signal is 0) and the time when the photoelectric tube with high material level is empty (the photoelectric tube signal is 0);
4. The waiting feeding time of the limit pipe of the electronic belt scale is the filling redundant time T3 of the limit pipe of the electronic belt scale, and T3=T2-T1;
5. knowing that the length of a belt conveyer at a feed opening of a storage cabinet is B1 (meter) and the linear speed of the belt conveyer is S1 (meter/second), firstly calculating the belt running distance of the belt conveyer within the filling time of a limit pipe of an electronic belt scale to be B2 (meter), wherein B2=S1×T1, and then calculating the ratio M of the belt running distance of the belt conveyer at the feed opening of the storage cabinet to the length of the belt conveyer at the feed opening, wherein M=B2/B1;
6. Given the setting frequency P1 (times/second) of the discharging of the bottom of the storage cabinet, the larger the filling time T1 of the limit tube of the electronic belt scale is, the lower the discharging frequency of the bottom of the storage cabinet is, otherwise, the discharging frequency of the bottom of the storage cabinet is, according to the rule, the discharging redundancy S2 (times/second 2) of the storage cabinet in the unit filling time of the limit tube is calculated, and S2=P1/T1;
7. calculating the storage cabinet discharging redundancy P2, P2=S2×T3 according to the storage cabinet discharging redundancy S2 in unit time and the electronic belt scale limit pipe filling redundancy time T3;
8. Finally, according to the storage cabinet discharging redundancy P2, the storage cabinet bottom discharging set frequency P1 and the ratio M of the belt running distance of the storage cabinet discharging port belt conveyor to the belt length of the discharging port, the optimal discharging frequency P3 of the storage cabinet is calculated, P3=P1-P2×| (1-M) | (wherein| (1-M) | represents the absolute value of the logarithmic value (1-M)), and the control program automatically executes the optimal discharging frequency.
The beneficial effects of the invention are as follows:
the invention can accurately adjust the discharging frequency of the feeding and storing cabinet of the electronic belt scale, and avoid the phenomena of frequent start and stop of equipment at the feeding end of the electronic belt scale or larger fluctuation of instantaneous flow of materials and the like caused by the high and low feeding speed.
Drawings
Fig. 1: and a layout diagram of a feeding device of the control type electronic belt scale.
Detailed Description
Example 1
During the flavoring production of factory tobacco shreds, the filling time of the limit tube of the electronic belt scale is found to be obviously longer than the discharging time of the limit tube of the electronic belt scale, the instantaneous flow fluctuation of materials is larger due to the slow feeding speed, the discharging frequency of a feeding and storing cabinet of the electronic belt scale is accurately regulated by adopting the method, and the automatic regulation process of the system is as follows:
The system recognizes that the set flow L of the electronic belt scale is 8000 kg/hour before blade charging; according to the detection signals of the photoelectric tube of the high and low material level of the limit tube of the electronic belt scale, the system calculates that the filling time T1 of the limit tube of the electronic belt scale is 19 seconds and the discharging time T2 of the limit tube of the electronic belt scale is 13 seconds, and simultaneously calculates that the filling redundant time T3 of the limit tube of the electronic belt scale is-6 seconds; the known belt length of the belt conveyer at the discharging opening of the storage cabinet is 2.5M, the linear speed of the belt conveyer is S1 is 0.18M/S, the belt conveyer belt running distance in the filling time of the limiting pipe of the electronic belt scale is calculated to be 3.42M, and then the ratio M of the belt conveyer belt running distance at the discharging opening of the storage cabinet to the belt length of the discharging opening is calculated to be 1.37; the current discharging frequency P1 of the bottom of the storage cabinet is 35 times/second, and the discharging redundancy S2 of the storage cabinet in unit time is calculated to be 1.84 times/second 2 according to the filling time T1 of the limit pipe of the electronic belt scale; calculating the discharging redundancy P2 of the storage cabinet to be-11.1 times/second according to the discharging redundancy S2 of the storage cabinet in unit time and the filling redundancy time T3 of the limiting tube of the electronic belt scale; and finally, calculating the optimal discharging frequency P3 of the storage cabinet to 39 times/second according to the storage cabinet discharging redundancy P2, the storage cabinet bottom belt discharging set frequency P1 and the ratio M of the belt running distance of the storage cabinet discharging port belt conveyor to the belt length of the discharging port.
Example 2
During factory blade feeding production, the filling time of the limit pipe of the electronic belt scale is found to be obviously smaller than the discharging time of the limit pipe of the electronic belt scale, the feeding speed is high, so that equipment at the feeding end of the electronic belt scale is frequently started and stopped, the discharging frequency of a feeding storage cabinet of the electronic belt scale is rapidly and accurately regulated by adopting the method, and the automatic regulation process of the system is as follows:
the system recognizes that the set flow L of the electronic belt scale is 6000 kg/hour before blade charging; according to the detection signals of the photoelectric tube of the high and low material level of the limit tube of the electronic belt scale, the system calculates that the filling time T1 of the limit tube of the electronic belt scale is 10 seconds and the discharging time T2 of the limit tube of the electronic belt scale is 15 seconds, and simultaneously calculates that the filling redundant time T3 of the limit tube of the electronic belt scale is 5 seconds; the known belt length of the belt conveyor at the discharging opening of the storage cabinet is 2M, the linear speed of the belt conveyor is 0.15M/S, the belt travel distance of the belt conveyor in the limit tube filling time of the electronic belt scale is calculated to be 1.5M, and then the ratio M of the belt travel distance of the belt conveyor at the discharging opening of the storage cabinet to the belt length of the discharging opening is calculated to be 0.75; the current discharging setting frequency P1 of the bottom of the storage cabinet is 38Hz, and the discharging redundancy S2 of the storage cabinet in unit time is calculated to be 3.8 times/second 2 according to the filling time T1 of the limit pipe of the electronic belt scale; calculating the discharging redundancy P2 of the storage cabinet to be 19 times/second according to the discharging redundancy S2 of the storage cabinet in unit time and the filling redundancy time T3 of the limiting pipe of the electronic belt scale; and finally calculating the optimal discharging frequency P3 of the storage cabinet to be 33 times/second according to the storage cabinet discharging redundancy P2, the storage cabinet bottom belt discharging set frequency P1 and the ratio M of the belt running distance of the storage cabinet discharging port belt conveyor to the belt length of the discharging port.
Claims (4)
1. The method for automatically adjusting the discharging frequency of a feeding storage cabinet of a control type electronic belt scale is characterized by comprising the following steps of:
Step 1, calculating the filling redundancy time T3=T2-T1 of the limit pipe of the electronic belt scale, wherein: t1 is the filling time of the limit pipe of the electronic belt scale, and T2 is the discharging time of the limit pipe of the electronic belt scale;
Step 2, calculating a belt running distance of the belt conveyor within the filling time of the limit pipe of the electronic belt scale to be B2=S1×T1, wherein the linear speed of the belt conveyor is S1; calculating a ratio M=B2/B1 of the belt running distance of the storage cabinet blanking port belt conveyor to the length of the blanking port belt conveyor, wherein B1 is the length of the storage cabinet blanking port belt conveyor;
Step 3, calculating the discharge redundancy S2=P1/T1 of the storage cabinet in unit filling time, wherein P1 is the set frequency of the discharge carried out by the bottom of the storage cabinet;
Step 4, calculating the discharging redundancy P2=S2×T3 of the storage cabinet;
Step 5, calculating the optimal discharging frequency P3=P1-P2×| (1-M) | of the storage cabinet, and automatically executing the optimal discharging frequency by a control program, wherein: m is the ratio of the belt running distance of the belt conveyor at the feeding port of the storage cabinet to the length of the belt at the feeding port, and I (1-M) I represents the absolute value of the logarithmic value (1-M).
2. The method according to claim 1, characterized in that in step 1, the calculation of the electronic belt scale limit tube filling time t1=high level detection photocell closing time-low level photocell idle opening time.
3. The method according to claim 1, characterized in that in step 1, the electronic belt scale limits the tube discharge time t2=low level photocell idle on time-high level detection photocell idle on time.
4. A computer readable storage medium having stored thereon a computer program, wherein the computer program is executed by a processor to perform the steps of the method of automatically adjusting the discharge frequency of a controlled electronic belt scale feed bin as claimed in any one of claims 1 to 3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410202321.3A CN117902342A (en) | 2024-02-23 | 2024-02-23 | Method for automatically adjusting discharging frequency of feeding storage cabinet of control type electronic belt scale |
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| CN202410202321.3A CN117902342A (en) | 2024-02-23 | 2024-02-23 | Method for automatically adjusting discharging frequency of feeding storage cabinet of control type electronic belt scale |
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