CN1028182C - Method and apparatus for controlling bunker weighing - Google Patents
Method and apparatus for controlling bunker weighing Download PDFInfo
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- CN1028182C CN1028182C CN 92102248 CN92102248A CN1028182C CN 1028182 C CN1028182 C CN 1028182C CN 92102248 CN92102248 CN 92102248 CN 92102248 A CN92102248 A CN 92102248A CN 1028182 C CN1028182 C CN 1028182C
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- gate
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- feed supplement
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- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
- Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
Abstract
The present invention relates to a method and a device thereof for controlling the weighing of hopper scales, which is especially suitable for self-processing when weighing deviation exceeds a permitted index. By using the dynamic characteristic of a feeding gate at the bottom of a material storage bin and a discharging gate at the bottom of a weighing hopper, a computer and an interface device thereof are arranged, characteristic models of actuating mechanisms for feeding and discharging are established, and an executive program is compiled. If weighing deviation is below a permitted index, the characteristic model of the actuating mechanism of the feeding gate is invoked, and the time for repeat feeding of the feeding gate is controlled to feed. When the weighing deviation exceeds the permitted index, the characteristic model of the actuating mechanism of the discharging gate is invoked, the discharging time of the discharging gate is controlled, and excess materials are intercepted in the weighing hopper. The weighing deviation of materials discharged into package bags is lower than the permitted index through the automatic processing of feeding or discharging.
Description
The present invention relates to a kind of control method and equipment thereof of bunker scale weighing, belong to and to have the weighing equipment that automatic feed or discharge for weighing-out become batch of material.
The graininess of prior art or the powdery bunker scale used of material weighing in batch comprise feeding gate, the bucket of storage bin, storage bin bottom, Dump gate, control system and the topworks thereof of bucket bottom.There is multiple pattern in the weigh control system and the topworks thereof of value set-point: the US2954202 patent is reinforced, weighing, the discharge control system that a kind of mechanical type is equipped with the make and break contact sequence controller, adopts the lever balance theory weighing.At first, thick, thin feeding gate is opened simultaneously, to the bucket feed, then, thick feeding gate is regularly closed, and continues feed by thin feeding gate, reaches set-point when weighing in the bucket, during with counterweight weights balance, balanced lever touches electric terminal, controls thin feeding gate and closes, discharging thereupon.Bucket one is unstowed, and lever unclamps electric terminal with regard to out of trim, and thick, thin feeding gate is opened the circulation weighing again simultaneously.The EP290999A2 patent is equipped with spiral batcher in the storage bin bottom, and be furnished with driver and CD-ROM drive motor, utilize the dynamic characteristic of screw feeder and the CD-ROM drive motor of adjustable-speed, control the running speed of motor according to the difference of weighing-up wave and set-point signal, reach the purpose of regulating feed by the value set-point of weighing.The US4793512 patent is equipped with the volume dispenser and drives the motor and the microprocessor controller of volume dispenser, adopt the volumetric method metering to be modified into the weighing method feed during with batch feed, and the controllability by volume dispenser motor, change the unit interval feed of volume dispenser, to regulate feed.The US4705125 patent is to regulate feed by the switching of step motor control feeding gate, and stepper motor is by computer control, and size that feeding gate is opened and time are by the program curing instruction control that sets in advance.
The bunker scale value set-point of weighing is that bucket bare weight and the required weight of the every bag of packaging bag (net weight) sum deduct " fall through material heavy ".Bucket bare weight and the required weight of every bag are by manually providing.And the so-called material that falls through heavily is a control system to the weight signal of LOAD CELLS after treatment, sends to close feeding gate and instruct in this process of feeding gate Close All the whole weight of material that fallen by feeding gate.Because the variation of the variation of the states such as unevenness of Flow of Goods and Materials and the factors such as electromechanical time constant instability of control system and topworks thereof, the material that falls through heavily is a random variation, make the weigh control system of value set-point of existing bunker scale have bigger Dynamic Weighting deviation, thereby the weight of material error in the packaging bag of packing into is also bigger.Especially under the environment of high humidity, high temperature, the material fluidity variation, inhomogeneous even caking, the material that falls through of this moment heavily alters a great deal, and causes the weighing of bunker scale to surpass the deviation index that allows, and promptly occurs " overproof ".The weigh control system of value set-point of the bunker scale of prior art does not overcome overproof measure, can't use at the environmental baseline hopper scale of high humidity, high temperature.
The present invention be intended to overcome the deficiencies in the prior art part and provide a kind of can be to overproof from control method and the equipment thereof handled, thereby implement to mend automatically, move back in the time of can surpassing the permissible variation value to the material metage in the bucket, the weighing deviation of bunker scale is remained in the index of permission.
The present invention can be achieved through the following technical solutions: the dynamic perfromance of utilizing existing bunker scale feeding gate and Dump gate, in bucket installing LOAD CELLS, configuration computing machine and signal processing channel thereof, output control mouth, set up the dynamic feed time and the mathematical model (characteristic model of feeding gate topworks) of adding the fundamental function of inventory in the bucket and the digital model (characteristic model of Dump gate topworks) of the dynamic discharging time of Dump gate topworks and the fundamental function that Dump gate is held back inventory of feeding gate topworks, the program of being compiled into deposits in the computer memory, as executive routine.The Dynamic Weighting that claims when hopper finishes, change over to when proofreading and correct material metage, occur negative overproof as the weighing in the bucket, computing machine is calculated overproof value, and access the characteristic model of feeding gate topworks, obtain the heavily reinforced time of feeding gate topworks, with this time value control feeding gate topworks repeat to feed in raw material (feed supplement is from handling).If a feed supplement is unsuccessful, with said procedure repeated priming feeding gate, feed supplement once more is up to weighing deviation in the permissible value scope.When weighing in the scale hooper occurs positive excess when poor, computing machine is calculated overproof value, and accesses the characteristic model of Dump gate topworks, obtains the discharging time of Dump gate topworks, utilization is trapped in (material returned is from handling) in the bucket to the control of discharging time with just overproof inventory.Automatically handle through the feed supplement or the material returned, make the weight of material that is discharged in the packaging bag in the deviation index that allows.
Adopt technical scheme of the present invention, when the relative humidity of environment continues at 80-90%, in the time of temperature 30-35 ℃, under the condition of even caking poor, inhomogeneous at material fluidity, after feed supplement or oneself processing of the material returned, the weight of material deviation that is discharged in the packaging bag is no more than ± 40 grams.And, do not implementing of the present inventionly when handling technology to same bunker scale, the weight of material deviation that is discharged in the packaging bag surpasses ± 200 grams.For the bunker scale of the control that uses a computer, implement technical scheme of the present invention and need not increase computer hardware, can realize purpose of the present invention to the computing machine loading routine.
The drawing of accompanying drawing is described as follows:
Fig. 1 is bunker scale Weighting and Controlling System figure;
Fig. 2 is the timeslice of thin feeding gate topworks and the data sequence of inventory relation;
Fig. 3 is the dynamic feed supplement characteristic curve of the thin feeding gate after smoothing processing (tables of data 1);
Fig. 4 is the negative overproof self-modeling logic diagram of handling certainly;
Fig. 5 is the negative overproof actuating logic block diagram of handling certainly;
Fig. 6 is Dump gate blowing time and the data sequence that is trapped the inventory relation;
Fig. 7 is the dynamic material returned characteristic curve of the Dump gate after smoothing processing (tables of data 2);
Fig. 8 is the just overproof reason self-modeling logic diagram of getting along alone;
Fig. 9 is the just overproof reason actuating logic block diagram of getting along alone;
Figure 10 is the total logic diagram of weighing.
Below in conjunction with embodiment technical scheme of the present invention is done further statement:
Fig. 1 shows the bunker scale Weighting and Controlling System.Present embodiment adopts the described hopper of US2954202 patent to claim, comprises storage bin (1); The thin feeding gate (2) of storage bin bottom and thick feeding gate (3), the switching of feeding gate is promoted by cylinder; Bucket (4); The Dump gate (5) of bucket bottom, the switching of Dump gate is also promoted by cylinder; Pneumoelectric conversion topworks (11).Present embodiment has been set up two LOAD CELLS (6), (7), replaces the lever and the counterweight weights mechanism of US2954202 patent; Analog to digital converter (8), microcomputer calculation machine (9), output control mouthful (10) have been disposed; The thick feeding gate (3) that to be made up of the hard logic circuit and the timing working mode of Dump gate (5) make into to calculate machine (9) control by microcomputer.
The crooked beam type of L-100 type is adopted in LOAD CELLS (6), (7); Analog to Digital Converter (8) is made of MC14052 multi-way switch, amplified signal level, Filtering Processing level and analog to digital conversion level, and modulus switching device adopts 16 A/D chips; Microcomputer (9) adopts the MCS-51 series monolithic; Output control mouthful (10) is made up of photoelectronic coupler and bidirectional triode thyristor.
Material and the bucket bare weight sum that to be weighed in LOAD CELLS (6), (7) convert electric signal to, deliver to analog to digital converter (8), microcomputer is calculated machine (9) digital signal of being sent here by analog to digital converter (8) is handled, isolate and promotion pneumoelectric switching stage (11) by output control mouthful (10), thereby by pneumatic actuator control weighing work.
One, negative overproof from handling
1, the carefully modeling of feeding gate topworks fundamental function
(1) exhausts the working routine that formula equal difference increases progressively timeslice between the thin feeding gate of establishment topworks, be stored in microcomputer and calculate in the memory of machine.
(2) by the above-mentioned working routine start-up system of working out, measure the inventory that is added in each timeslice of thin feeding gate topworks in the bucket by LOAD CELLS, handle through microcomputer, obtain the timeslice of one group thin feeding gate topworks and the associated dynamic data sequence of inventory.As shown in Figure 2.
(3) according to the data sequence of gained, calculate its average and through smoothing processing, make the dynamic time and the mathematical model of adding the fundamental function of inventory in the bucket (characteristic model of thin feeding gate topworks) of thin feeding gate topworks.Shown in the curve of Fig. 3.
(4) this characteristic model is compiled into tables of data 1, deposits in the memory of microcomputer, use as executive routine.
Fig. 4 shows negative overproof from handling the self-modeling logic diagram.
2, negative overproof from the execution of handling
Bunker scale finishes in Dynamic Weighting, change the material weighing timing over to, when surpassing the permission index as dynamic reinforced not enough amount, i.e. appearance is negative overproof, and microcomputer is calculated overproof value, access the characteristic model (tables of data 1 of thin feeding gate topworks, Fig. 3), obtain the heavily reinforced time value of thin feeding gate topworks, control thin feeding gate topworks with this time value again and repeat to feed in raw material, the deficiency when thereby the compensation bunker scale is dynamically reinforced is finished automatic feeding and is handled.Fig. 5 shows negative overproof from handling the actuating logic block diagram.
Two, the just overproof reason of getting along alone
1, the modeling of Dump gate topworks fundamental function
(1) establishment every bucket discharging time of Dump gate is stored in the memory of microcomputer by the equal difference mode working routine of successively decreasing.
(2) start bunker scale,,, record the different discharging times and the one group of data sequence that is trapped inventory of Dump gate by microcomputer by weighing sensor by the work of building program schema.Shown in the curve of Fig. 6.
(3), calculate its average and, make the mathematical model (characteristic model of Dump gate topworks) of dynamic time with the fundamental function of the inventory of being held back by Dump gate of Dump gate topworks through smoothing processing according to the data sequence of gained.Shown in the curve of Fig. 7.
(4) this characteristic model is compiled into tables of data 2, deposits in the memory of microcomputer, use as executive routine.
Fig. 8 shows the just overproof reason self-modeling logic diagram of getting along alone.
2, the execution of the just overproof reason of getting along alone
When the bunker scale Dynamic Weighting finishes, change the material weighing timing over to, surpass when allowing index, promptly occur just overproof as the amount of dynamic overcharge, microcomputer is calculated overproof value, (tables of data 2 Fig. 7), is calculated the time that Dump gate is answered discharging to access the characteristic model of Dump gate topworks, just overproof inventory is trapped in the bucket, by control to the discharging time, make the material metage that is discharged in the packaging bag in the deviation index that allows, finish the automatic material returned and handle.Fig. 9 shows the just overproof reason actuating logic block diagram of getting along alone.
Figure 10 shows the total logic diagram of weighing.After the system start-up, decide the duty of system itself by duty identification.Just drop into by artificial dried giving, enter overproofly by man-machine mouth, at first access negative overproof (feed supplement) and handle self-modeling program (Fig. 4) certainly, make tables of data 1(Fig. 3 from handling the sub-piece of self-modeling), deposit memory in.Then, microcomputer is carried out just overproof (material returned) downwards and is handled self-modeling program (Fig. 8) certainly, makes tables of data 2(Fig. 7), deposit memory in.Cause this, overproof self-modeling end-of-job, system enters normal weighing duty, its program is: system is after each Dynamic Weighting finishes, just proofread and correct this weighing error value immediately, so that weighing value is next time adjusted, simultaneously, whether surpass the deviation index that allows according to error, feed supplement whether is carried out in decision or the material returned is handled certainly.
Surpass lower limit as error, microcomputer will call negative overproofly carries out sub-piece (Fig. 5) from handling, and according to deviate, finds out in the memory two adjacent on the tables of data 1 point data, calculates the feed supplement time of thin feeding gate, controls thin feeding gate with this time and carries out feed supplement.Feed supplement finishes, and proofreaies and correct bucket again and always weighs, and calculates actual feed supplement value, and with this feed supplement value proofread and correct again the dynamic feed supplement characteristic curve of thin feeding gate (tables of data 1, Fig. 3).If a feed supplement is unsuccessful, system can start thin feeding gate feed supplement once more with above-mentioned feed supplement program, up to weighing deviation in the permissible value scope.
In like manner, when error surpasses the upper limit, microcomputer will call the just overproof reason of getting along alone and carry out sub-piece (Fig. 9), according to deviate, find out in the memory two adjacent on the tables of data 2 point data, calculate the discharging time of Dump gate,, do the material returned with the means of holding back partial material and handle with the discharging of this time control Dump gate.Discharging finishes, and proofreaies and correct always weighing of bucket again, calculates actual material returned value, and with this material returned value proofread and correct again the dynamic material returned characteristic curve of Dump gate (tables of data 2, Fig. 7).So far, the material returned finishes.System enters weighing next time.
Present embodiment is at the lasting 80-90% of the relative humidity of environment, when temperature is 30-35 ℃, material fluidity poor, inhomogeneous in addition the caking condition under, after feed supplement is handled certainly, the weight of material deviation that is discharged in the packaging bag is no more than ± 20 grams, is no more than ± 40 grams through the weight of material deviation of the material returned after handling.
Claims (4)
1, a kind of control method of bunker scale weighing, divide dynamic weighing and proofread and correct negative overproof two stages of material weighing, when Dynamic Weighting finishes its gravimetric value less than predetermined value, determine to detect difference, utilize the computing machine corrected error value, utilize the gate feed supplement of bin gate then, it is characterized in that utilizing the dynamic perfromance of feeding gate and Dump gate, in bucket installing LOAD CELLS, configuration computing machine and signal processing channel, output control mouth, set up the dynamic feed time and digital model and the dynamic discharging time of Dump gate topworks and the mathematical model of the fundamental function that Dump gate is held back inventory of adding the fundamental function of inventory in the bucket of feeding gate topworks, be compiled into program, deposit in the computer memory, as executive routine, Dynamic Weighting end when bunker scale, change over to when proofreading and correct material weighing, occur when negative overproof as weighing, computing machine is calculated overproof value, and access the characteristic model of feeding gate topworks, obtain the heavily reinforced time of feeding gate topworks, carry out feed supplement with this time value control feeding gate topworks, occur positive excessly when poor as weighing, computing machine is calculated overproof value, and accesses the characteristic model of Dump gate topworks, obtain the discharging time of Dump gate topworks, utilization is trapped in just overproof inventory in the bucket the control of discharging time, carries out the material returned.
2, by the described bunker scale Weighting and Controlling of claim 1 method, it is characterized in that then with same feed supplement program, starting feeding gate if a feed supplement is unsuccessful, feed supplement once more, up to the weighing deviation in permissible value.
3, by the described bunker scale Weighting and Controlling of claim 1 method, it is characterized in that the each feed supplement or the material returned finish, proofread and correct the bucket total weight, calculate actual feed supplement or material returned value, and proofread and correct dynamic feed supplement characteristic curve of feeding gate or the dynamic material returned characteristic curve of Dump gate respectively again with this feed supplement or the material returned.
4, by the equipment of the described bunker scale Weighting and Controlling of claim 1 method, its feature comprises the Dump gate (5) bottom the thin feeding gate (2) of storage bin (1) storage bin (1) bottom and thick feeding gate (3), bucket (4), the bucket (4), LOAD CELLS (6), (7) on the bucket (4); From the signal input analog-to-digital converter (8) of LOAD CELLS (6), (7), convert to and import computing machine (9) after the digital signal and handle, isolate by output control mouthful (10) again and promote pneumoelectric conversion topworks (11) control bunker scale weighing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92102248 CN1028182C (en) | 1992-04-04 | 1992-04-04 | Method and apparatus for controlling bunker weighing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92102248 CN1028182C (en) | 1992-04-04 | 1992-04-04 | Method and apparatus for controlling bunker weighing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1077282A CN1077282A (en) | 1993-10-13 |
| CN1028182C true CN1028182C (en) | 1995-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92102248 Expired - Fee Related CN1028182C (en) | 1992-04-04 | 1992-04-04 | Method and apparatus for controlling bunker weighing |
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| Country | Link |
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| CN (1) | CN1028182C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101606046B (en) * | 2006-11-17 | 2013-11-27 | 株式会社松井制作所 | Material metering system |
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| CN102494746A (en) * | 2011-12-02 | 2012-06-13 | 中联重科股份有限公司 | System and method for material weighing and weighing controller |
| CN105091950B (en) * | 2015-09-22 | 2017-11-07 | 巫占海 | Temperature, thing position integrative detection instrument |
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| CN108414062A (en) * | 2018-05-17 | 2018-08-17 | 无锡应达工业有限公司 | A kind of feed bin device for titanium sponge weighing feeding system |
| CN108548590B (en) * | 2018-06-11 | 2020-06-26 | 瑞安市瑞海机电有限公司 | Hanging bucket lever type metering device |
-
1992
- 1992-04-04 CN CN 92102248 patent/CN1028182C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101606046B (en) * | 2006-11-17 | 2013-11-27 | 株式会社松井制作所 | Material metering system |
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| Publication number | Publication date |
|---|---|
| CN1077282A (en) | 1993-10-13 |
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Granted publication date: 19950412 |