CN107684847B - Screw multiple groups part proportioning materials method - Google Patents
Screw multiple groups part proportioning materials method Download PDFInfo
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- CN107684847B CN107684847B CN201710895903.4A CN201710895903A CN107684847B CN 107684847 B CN107684847 B CN 107684847B CN 201710895903 A CN201710895903 A CN 201710895903A CN 107684847 B CN107684847 B CN 107684847B
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- blanking
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- screw
- multiple groups
- weighing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/80—Forming a predetermined ratio of the substances to be mixed
- B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
- B01F35/881—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise by weighing, e.g. with automatic discharge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/7176—Feed mechanisms characterised by the means for feeding the components to the mixer using pumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/71775—Feed mechanisms characterised by the means for feeding the components to the mixer using helical screws
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/79—Preventing lumping, or comminuting lumps, during feeding or discharging, e.g. by means of vibrations, or by scrapers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/80—Forming a predetermined ratio of the substances to be mixed
- B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
- B01F35/882—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using measuring chambers, e.g. volumetric pumps, for feeding the substances
- B01F35/8821—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using measuring chambers, e.g. volumetric pumps, for feeding the substances involving controlling
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Abstract
The invention discloses screw multiple groups part proportioning materials method, operating and the real-time sensing data that reads Weighing module of the controller by control auger conveyor carry out the blanking calibration of each component material respectively, are iterated prediction to the air weighting of its blanking；Also make the Level control of blanking bin in a smaller range by adjusting the revolving speed of feed pump；And based on accumulation discharge quantity and formulation data to compare auger conveyor shut-in time carry out dynamic regulation.Material is opened push plate after mixing, mixture is discharged by the successively blanking of each component material when detecting that the material in blending bucket reaches setting value.The present invention reduces the variation of material distribution and impact in blanking process using range sensor, vibrating arm and tripper, accelerates iteration and predicts convergence rate, higher blanking velocity is obtained while guaranteeing precision, and be suitable for the quick ingredient of small lot.
Description
Technical field
The present invention relates to quantitative ingredient fields, and in particular to a kind of screw multiple groups part proportioning materials method.
Background technique
In industrial or agricultural manufacture and commodity packaging, there is a large amount of powder grain material, as polypropylene, polystyrene, polyvinyl chloride,
The industrial chemicals such as light methylcellulose, polyacrylonitrile, epoxy powder coating, the building materials raw material such as quartz sand, cement, washing powder
Equal daily chemical products, the corn beans such as millet, soybean agricultural products or powder, slag, granular processed food, feed, chemical fertilizer, pesticide
Equal agricultural productions material and health care product, Chinese and Western medicine, the flavouring of granular etc. are required to automatic quantitative packing or ingredient
Manufacture.
China has many enterprises still to use manual quantitative ingredient or packaging, one side large labor intensity, rate at present
Slowly, deficiency in economic performance；On the other hand, food, drug etc. quantitatively tend not to meet hygienic requirements, poisonous and hazardous object by hand
Material, it is artificial to participate in quantitatively being easy to cause harm to the human body.Therefore for manufacturing enterprise, be badly in need of provide cost is relatively low but have compared with
Multiple groups part automatic ration blanking dispensing equipment of high-speed and accuracy meets a large amount of material dosing packaging or ingredient manufacture
It is required that.
At present both at home and abroad there are two types of powder grain material automatic ration ingredient blanking common methods, positive displacement and Weighing type.Volume
Formula quantitative basis material volume carries out metering filling or feeds intake, and quantitatively feeds intake rapidly, but quantitative quality of material is close by material
Degree changes and changes.To improve cutting stock precision, there are a variety of adjusting methods, such as application No. is 201320001933.3 China
Patent uses frequency control to screw rod, slows down gradually rate of feeding close to target value, reduces falling down error value；Application No. is
201310234280.8 Chinese patent, under dividing the multistage using big small screw in soda ash packing machine three-speed frequency conversion feeding process
Material；It considers to be difficult to control when fast blanking quantitatively and by first quick and back slow application No. is 200920248298.2 Chinese patent
Method come reduce feed drop influence；The blanking final value of these non-Weighing type schemes can only be close to desired value, and accuracy is not
It is high.
One secondary amounts of material set by Weighing type quantitative basis carries out metering filling or feeds intake, and needs in blanking process
Constantly weighing, according to weighing results feedback control discharge quantity, due to weighing by blanking impact and aerial lag material influenced compared with
Greatly, component blanking velocity and precision all suffer from many difficulties.Interference in order to compensate for aerial material to measuring accuracy, many schemes
Using the technology for closing valve in advance, such as application No. is 201410230888.8 Chinese patents is divided into batching weighing process
Three phases, and calculate closing using iterative learning control mode in the last stage and shift to an earlier date control amount, but the program is only
The cutting stock precision after the completion of study can be improved, the accumulation cutting stock precision in learning process not can guarantee then.
Summary of the invention
Simple screw feed appliance belongs to positive displacement quantitative scope, and filling is measured in positive displacement quantitative filling based on volume
The quantity of material, structure is simple, at low cost, but quantitative filling speed stability and precision depend on the stabilization of material apparent gravity
Property, it is affected by physicochemical properties such as material loosening degree, particle uniformity coefficient, hygroscopicity.
From principle, at present positive displacement quantitative filling can be divided into control attal flow or the time and
Material both types are measured with identical measuring container.The former is frequently with the time of vibration or control spiral shell for controlling oscillating feeder
The rotational time for revolving filling machine realizes quantitative filling；The latter's measuring cup, graduated cylinder or quantitative filling machine of plunger etc..Regardless of using that
A kind of positive displacement quantitative filling, there is a common problem, seeks to make as far as possible the apparent gravity of material to stablize.
Since common positive displacement is substantially conversion formula, no image of Buddha Weighing type equally grasps the definite quality of blanking, after
Although occur finishing the scheme for being collectively referred to as weight, can only be sent by blanking final stage is extremely low due to there is no air weighting to predict
Speed is expected to guarantee precision.
For this purpose, the invention patent carries out blanking process while by dynamic weighing detection in conjunction with screw feeding device
Improve, reduce the variation of compactness and material falling down error in material silo, and by iteration is predicted by error current and
For accumulated error as controlled volume, dynamic adjusts the operating speed in auger conveyor dwell time and last stage in blanking process
Degree, to obtain higher average operating speed while guaranteeing precision, avoids general screw baiting method most
The stage operates especially slow problem afterwards.
The technical solution of the invention is as follows, provides a kind of screw multiple groups part proportioning materials method comprising following step
It is rapid:
S1, according to a secondary amounts and each formula rate, a discharge quantity Ws of each component is determined, to the accumulation blanking of each component
Error E assigns initial value 0；Current component is set as the first component；
S2, the blanking since blanking bin to current component, controller read the sensed values of the Weighing module of support weighing hopper,
The initial weight G0 of weighing hopper is recorded, starts auger conveyor and with μ amaxAcceleration accelerates, when speed reaches vH=λ vR
When keep speed it is constant, record start the moment be t0；
Wherein, amaxFor the specified peak acceleration of screw rod of auger conveyor, vRFor maximum speed, μ be (0.5~0.9) it
Between acceleration factor, velocity coeffficient of the λ between (0.85~1.0)；
S3, when detecting that weighing hopper weight reaches (G0+Ws-Wa-0.5 λ dts) when, begin to shut off helical feed
Device and with μ amaxAcceleration reduces speed now, until stopping；
Wherein, Wa is air weighting predicted value, and d is the blanking rate of auger conveyor when screw rod is operated with maximum speed, ts
For from the moment that reduces speed now to the time span between the stop timing, ts=λ vR/μ·amax；
S4, it waits material to fall to weighing hopper completely, reads the sensed values of Weighing module, obtain currently practical discharge quantity
Wr calculates this drafting error e=Wr-Ws；
S5, accumulation drafting error E '=E+e is updated, calculated air weighting predicted value Wa '=Wa+ (α e+ β E '), wherein α and β
Respectively the iteration coefficient of section (0,1) and there is alpha+beta=1；
S6, iteration, enable E=E ', Wa=Wa ', are that the blanking next time of this component prepares；
S7, replacement blanking component turn in next step, otherwise, to go to step S2 if whole component blankings finish；
S8, the discharge valve for opening weighing hopper bottom, so that a formula ratio material of multiple groups part material composition falls into mixing
Bucket, reads the state of level sensor in blending bucket, if detecting, material position is more than given threshold, blender in order blending bucket
Stirring after mixing by multiple groups part material opens the push plate of blending bucket bottom, and mixed material is exported from conveying pipeline；
If S9, default blanking batch have been completed, terminate blanking；Otherwise, component is set as the first component, turned
Step S2.
Preferably, there are also following steps before the step S1:
T1, pass through test experiment, the range sensor in Weighing module and blanking bin is demarcated；
T2, parameter setting, including a secondary amounts, formula table, batch value, blanking rate mark are carried out by the touch screen of controller
Fixed duration Tb and number of repetition, stable weighing delay Td；
T3, blanking calibration is carried out to each component: is operated since 0 moment by the speed governing curve of the even even deceleration of acceleration-constant speed-
Auger conveyor certain time length Tb is closing the auger conveyor Tb moment and the Tb+Td moment after stablizing of weighing, is reading respectively simultaneously
Record the weight value Wcb and Wdb of Weighing module；After repeatedly, the blanking rate d and air weighting initial value Wa of this component are calculated
=AVG (Wdb-Wcb).
Preferably, further comprising the steps of:
Step S1 further include: sorted from large to small by the value of discharge quantity Ws of each component, determine the blanking time of each component
Sequence；
Step S3 further include: as time t >=t0+0.85Ws/d, controller is forbidden all outer in addition to security response
It interrupts in portion；
Step S8 further include: blender discontinuously one small fan angle of multiple rotary reads again the state of level sensor,
If still material position is more than given threshold, mixing stirring is just carried out.
Preferably, further comprising the steps of:
The range sensor that rotation is located in blanking bin on the apex angle of nearly frame central carrys out detectable substance burden distribution, and passes through
Weighing module carries out real-time tracking to blanking rate, when discovery blanking bin material EDS maps exceed setting range, or discovery list
After position time blanking rate fluctuation is more than given threshold such as 5%, control order is fixed on rack and close to blanking bin side wall
Vibrating arm movement, adjusts the material accumulation form in blanking bin.
Preferably, being equipped with storage bin and feed pump above the blanking bin, the feed pump is screw feed pump,
There is a material spray head in the outlet of rear end feed pipe, the material spray head be it is spherical, circular aperture is distributed in surface, described
Charging revolution speed is controlled by such as following formula:
Wherein, VInto 0For a setting maximum feed velocity, l is the current material position of blanking bin, LMAnd LmRespectively it is default most
High, minimum blanking bin material position.
Preferably, setting a tripper on the top of weighing hopper, it is pressure that the tripper, which is cone lower part in top,
The hourglass shape tripper of flat cone structure, upper part are opening shape, and then only there is slope shape spray in lower part at the both ends of length direction
Mouth；The weighing hopper is distributed with spherical crown shape sub-material protrusion straggly on the direction towards the nozzle, material is through sub-material when blanking
Device nozzle and sub-material protrusion fall into the material heap in weighing hopper.
Preferably, a pumping board is arranged at the blanking bin bottom；The auger conveyor include screw case, conveying screw rod,
Connector and motor, the motor housing are connected by connector with screw case, and the conveying screw rod in screw case passes through axis
Set is connected with motor shaft, and with respect to having a feed inlet at blanking bin bottom opening, screw case is opposite with motor for screw case upper surface
The other end is also connected with the feeder pipe placed vertically, and when blanking opens pumping board, and material is passed through from the opening of blanking bin bottom
Auger conveyor is fallen in the material heap in weighing hopper to feeder pipe, then through tripper.
Preferably, the vibrating arm includes the pillar being sequentially connected, holder, vibrator, vibration bar, the vibrator bottom
There is a spring buffer, particle protrusion is distributed in the vibration bar surface, vibrator starting of oscillation and vibration bar does snakelike stir when vibrating arm acts
It is dynamic.
Using distribution of the present invention, compared with prior art, have the advantage that Distance-sensing is respectively adopted in the present invention
Device and rotatable vibrating arm are detected and are adjusted to the material accumulation form in blanking bin, guarantee that material compacting degree is stablized；Again
Reduce the variation of material falling down error and buckles by the way that tripper is arranged in weighing hopper, the convergence of iteration prediction can be accelerated
Speed；By the control to blanking accumulated error in the iteration prediction measured in the sky, enable the blanking quilt in learning process
Effective use, avoids material waste；Simultaneously because the convergence of iteration prediction, allows screw rod in blanking process to keep higher
Running speed improves blanking efficiency.
Detailed description of the invention
Fig. 1 is the composite structural diagram of screw multiple groups part proportioning materials device；
Fig. 2 is the shape assumption diagram of screw multiple groups part proportioning materials device；
Fig. 3 is material dropping process schematic diagram；
Fig. 4 is storage bin and blanking bin partial structural diagram；
Fig. 5 is material position schematic diagram in blanking bin；
Fig. 6 is that material is distributed detection schematic diagram in blanking bin；
Fig. 7 is vibration rod structure and running track schematic diagram；
Fig. 8 is tripper and weighing hopper side wall construction schematic diagram；
Fig. 9 is electric machine speed regulation curve；
Figure 10 is multiple groups part material layering schematic diagram in weighing hopper；
Figure 11 is variation diagram of weighing in material dropping process；
Figure 12 is the error statistics figure in a kind of material iteration prediction blanking process.
Wherein: 1, blanking bin 2, auger conveyor 3, weighing hopper 4, Weighing module 5, discharge valve 6, blending bucket 7, push away
Plate 8, conveying pipeline 9, controller 10, storage bin 11, feed pump 12, vibrating arm 13, blender 14, level sensor
15, feed pipe 16, material spray head 17, aperture 18, range sensor pedestal 19, range sensor 20, material position face 21, stop
By being directed toward point 22, scan line 23, tripper 24, tripper nozzle 25, sub-material protrusion 26, feeder pipe
30, rack 101, pumping board
121, pillar 122, holder 123, vibrator 124, vibration bar 125, particle protrusion 126, vibration bar track
201, screw case 202, conveying screw rod 203, connector 204, motor
Specific embodiment
The preferred embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any substitution made in the spirit and scope of the present invention, modification, equivalent method and scheme.
In order to make the public have thorough understanding to the present invention, it is described in detail in the following preferred embodiment of the present invention specific
Details, and the present invention can also be understood completely in description without these details for a person skilled in the art.
The present invention is more specifically described by way of example referring to attached drawing in the following passage.It should be noted that attached drawing is adopted
With more simplified form and using non-accurate ratio, only to facilitate, lucidly aid in illustrating the embodiment of the present invention
Purpose.
As depicted in figs. 1 and 2, the present invention is based on screw multiple groups part proportioning materials device, described device includes blanking bin
1, auger conveyor 2, weighing hopper 3, Weighing module 4, discharge valve 5, blending bucket 6 and controller 9, wherein the material of every kind of component is all
There are one group of blanking bin 1 and auger conveyor 2 corresponding, common component classification is 2~6 kinds, can also increase component as needed
Classification.Preferably, blanking bin 1 selects the feed bin shape structure of right-angled trapezium and rectangle composition, the blanking bin and helical feed
Device is 2~6 groups.
One pumping board 101 arranged at 1 bottom of blanking bin, and pumping board is opened when blanking, and material flows out from blanking bin bottom opening.
Auger conveyor 2 includes screw case 201, conveying screw rod 202, connector 203 and motor 204, the shell of motor 204
It is connected by connector 203 with screw case 201, the conveying screw rod 202 in screw case 201 passes through axle sleeve and motor 204
Axis is connected；201 upper surface of screw case is with respect to having a feed inlet at 1 bottom opening of blanking bin, the other end opposite with motor
It is connected to feeder pipe 26, feeder pipe 26 is fixed in rack 30.
Preferably, 26 inner wall of feeder pipe can set helicla flute, and the cell wall of the helicla flute is close to blanking bottom of the tube
Endpiece is discontinuously distribution.
Preferably, in feeder pipe 26 settable one be made of two frustums of a cone, its vertex of a cone is opposite and there is lotus at lower frustum bottom
The component of fluffy head spray head, makes material even drop down.
Referring to figs. 1 and 2, when blanking, controller 9 opens pumping board 101, and material falls into spiral transferring from blanking bin 1
It send in the screw case 201 of device 2, order motor 204 starts controller 9 again, and conveying screw rod 202 is rotated with motor, by material
It is transported to the feeder pipe 26 of end, and from the weighing hopper 3 that feeder pipe 26 falls into lower section.
Frame of the rack 30 as equipment, for fixing and supporting other all parts.Weighing module 4 is fixed on rack 30
On, weighing hopper 3 is then movable to be withheld on Weighing module 4, and opening arranged at the bottom of weighing hopper 3, the opening it is on and off
By the control of discharge valve 5.Weighing hopper 4 is located at the lower part of feeder pipe 26, multiple auger conveyors 2 opposite feeder pipe 26 and weighing hopper
4 center is radially distributed.
Controller 9 uses touching type operation mode, has man-machine interface for the formula of progress multiple groups part material on touch screen
And the setting of other parameters, total weight and each component of the formula including a blanking account for the percentage of the weight.Controller 9 is dynamic
State reads the current reading of Weighing module 4, realizes the blanking ingredient by formula by controlling each action component.
Blending bucket 6 is located at 5 lower section of discharge valve, and a push plate 7 is arranged at its bottom, is connected with a conveying pipeline 8 below push plate,
The mixed material of multiple groups part is transported to packaging bag or production equipment by the latter.
Preferably, being equipped with a level sensor 14 on the side wall of blending bucket 6, internal there are one blenders
13, the blender 13 uses helical blade blender.The capacity of blending bucket 6 is the several such as 15 times of weighing hopper 3, is completed
After multiple secondary amounts blankings, controller 9 reads the state of level sensor 14, if detecting, material position is more than given threshold, controls
Blender Stirring processed, after mixing by various materials, under the control of controller 9, push plate 7 open, mixed material from
Conveying pipeline 8 exports.
Fig. 3 illustrates the variation that material position drop and blanking speed impact weighing hopper in material dropping process, and material is with first
Speed v0It is fallen from auger conveyor 2, the outlet of auger conveyor 2 is H at a distance from 3 bottom of weighing hopper, in weighing hopper
Material position h2Increase, falling down error h1It will become smaller.
The quality of material equivalent variation that Weighing module detects can be represented by the formula:
Wherein, in t moment, dm is the unit time blanking quality (g/s) that auger conveyor 2 exports, v0For material whereabouts
When initial velocity, speed of the material of Δ m when falling on weighing hopper is within the Δ t time from speed v1Become 0.
From formula (1) as can be seen that with falling down error h1 variation, material to the impact of weighing hopper also with change, because
This, the weight change of weighing hopper changes over time.
On the other hand, shadow of the unit time blanking mass equivalent also by material fractions distribution in blanking bin 1 in formula (1)
It rings.
Simple screw feed appliance belongs to positive displacement quantitative scope, the present invention using dynamic weighing to material falling amount into
Row detection, and pass through the prediction of iterative learning progress material air weighting.The change of material descent rate when in order to reduce screw rod transmission
Change, accelerate study convergence rate and inhibit the fluctuation range of control amount, in conjunction with shown in 4,5,6 and 7, the present invention uses Distance-sensing
Device and rotatable vibrating arm are detected and are adjusted to the material accumulation form in blanking bin, so that alternately going out above its feed opening
The now formation and collapsing of dynamic material arch, guarantees the stabilization of material compacting degree and blanking form.
As shown in figure 4, blanking bin 1 constantly discharges, when material position is reduced to certain value in storehouse, need to carry out feed supplement to it.
For this purpose, a storage bin 10 is arranged above blanking bin 1, the material in storage bin 10 is entered by feed pump 11 and feed pipe 15
Blanking bin 1.To make material particles even drop down, a material spray head 16, material are equipped at the end outlet of feed pipe 15
16 surface of spray head be it is spherical, surface is distributed with circular aperture 17, and small aperture carries out preferred according to the granularity of material.Charging
Pump 11 uses screw feed pump, and movement is controlled by controller.
As shown in figure 5, feed pump 11 is under the control of the controller, so that the material position of material top surface is maintained at pre- in blanking bin
If value LTNear, revolving speed is controlled as the following formula:
Wherein, VInto 0For a setting maximum feed velocity, l is the current material position of blanking bin, LMAnd LmIt is respectively default
LTNeighbouring highest, minimum material position.
In conjunction with shown in Fig. 6,7, the present invention is cooperated by the detection and movement of range sensor and vibrating arm, is significantly subtracted
Weak charging impact caused by compaction force effect, effectively prevent the size segregation of material in storehouse, make in the magazine of lower part
Material activating ensure that being uniformly distributed for material, so that uniform laminar flow regime is presented in particle swarm in blanking process.
Two figures are controlled in Fig. 6 respectively from the side view of blanking bin 1 and overlook direction, as shown in fig. 6, close in blanking bin 1
Range sensor 19 is installed, the range sensor 19 has a range sensor pedestal on one apex angle of frame central
18, this pedestal can be carried out pitching and rotation, and range sensor is enabled to carry out material on the direction for being directed toward point 21 in different stop
Detection, it is each to stop the scan line 22 for being directed toward 21 composition of point close to concentric circles, to judge the distribution in material position face 20.
As shown in fig. 7, the present invention is acted in blanking bin 1 by vibrating arm 12 to improve the distribution of material.Vibrating arm 12
It is fixed in rack 30 comprising pillar 121, holder 122, vibrator 123, the vibration bar 124 being sequentially connected, in vibrator 123
Spring buffer is arranged at bottom, and particle protrusion 125 is distributed in vibration 124 surface of bar, and holder 122 can be carried out pitching and rotation, so that vibration
Bar 124 does curvilinear motion in blanking bin 1.
In blanking process, the present invention sentences by the detection of range sensor and to the tracking of unit time blanking rate respectively
The distribution of material in disconnected blanking bin, so that the material position face in blanking bin keeps near parabolic face shape.In conjunction with shown in Fig. 6 and Fig. 7,
When material is uniformly distributed, material distance value that range sensor is detected in different direction is through ray and vertical direction angle
It is approximately centered in after geometric transformation in a lesser range.When hardened or stable material arch locally occurs for material, detect
Distance value exceed this range.Meanwhile real-time tracking is carried out by blanking rate of the Weighing module to each blanking bin.When distance passes
Sensor detects above-mentioned abnormality or discovery unit time discharge quantity fluctuation is more than controller life after given threshold such as 5%
Vibrating arm is enabled to act, by the operating of holder, the bar that shakes does snake from the off through material position high point region to material position low spot region
Shape agitation, vibration bar track 126 of 124 tail end of bar in blanking bin 1 that shake are as shown in Figure 7；Meanwhile vibrator starting of oscillation, it shakes on bar
Particle protrusion drives the particle on periphery, to abolish the hardened or material arch formed once in a while, material distribution is made to restore uniform.By right
The dynamic detection and control of material distribution, reduce the fluctuation of material compacting degree, thus the stabilization of guarantor unit's time charging quantity.?
While vibrating arm acts, suspend blanking, and pumping board is shut.
In conjunction with shown in Fig. 3 and Fig. 8, the variation due to material falling down error h1 can be seen that from formula (1), material is to metering
Also with change, causing the weight gain in the Weighing module unit time is variation for the impact of bucket.As shown in figure 8, to subtract
A tripper 23 is arranged on 3 top of weighing hopper in the influence of small falling down error variation, the present invention, and tripper 23 is circular cone in top
Body lower part is the hourglass shape tripper of the cone structure flattened；Its middle and upper part is opening shape, receives the material in blanking bin；Lower part
Then slope shape nozzle 24 only has been symmetrically distributed at the both ends of length direction.Weighing hopper 3 is distributed on the direction towards nozzle 24
Spherical crown shape sub-material protrusion 25 straggly, preferably, sub-material projection diameter is 0.2~0.6 millimeter or is the 2 of institute's falling material diameter
~3 times.
By the effect of tripper, material whereabouts was divided into for three stages, and the first stage is from the opening of blanking bin bottom through spiral
For conveyer to feeder pipe, second stage falls on tripper under feeder pipe, the phase III from tripper nozzle to weighing hopper in
Material heap.Wherein, the material impact in the first two stage is approximate constant, the phase III, due to wrong on tripper and metering headwall
Distribution sub-material raised role is fallen, the speed in material face has substantially reduced in material particles impact weighing hopper, sprays from tripper
The impact force difference that mouth reaches different height material heap face in weighing hopper is very small, so that the iteration prediction for controller provides item
Part.
Based on the air weighting that iterative learning, controller dynamic prediction material fall, as shown in connection with fig. 9, the step of blanking control
It is rapid as follows:
(1) according to a secondary amounts and each formula rate, a discharge quantity Ws of each component is determined, to the accumulation blanking of each component
Error E assigns initial value 0；Current component is set as the first component；
(2) to current component blanking, controller reads the sensed values of Weighing module, records the initial weight G0 of weighing hopper,
Start auger conveyor and with μ amaxAcceleration accelerates, when speed reaches vH=λ vRWhen keep speed it is constant, record start
Moment is t0；
Wherein, amaxFor the specified peak acceleration of screw rod of auger conveyor, vRFor maximum speed, μ be (0.5~0.9) it
Between acceleration factor, velocity coeffficient of the λ between (0.85~1.0)；
(3) when detecting that weighing hopper weight reaches (G0+Ws-Wa-0.5 λ dts) when, begin to shut off helical feed
Device and with μ amaxAcceleration reduces speed now, until stopping；
Wherein, d is the blanking rate of auger conveyor when screw rod is operated with maximum speed, tsFor from the moment t that reduces speed now2
Start to stop timing t3Between time span: ts=λ vR/μ·amax；
(4) it waits material to fall to weighing hopper completely, reads the sensed values of Weighing module, obtain currently practical discharge quantity
Wr calculates this drafting error e=Wr-Ws；
(5) accumulation drafting error E '=E+e is updated, is calculated air weighting predicted value Wa '=Wa+ (α e+ β E '), wherein α and β
Respectively the iteration coefficient of section (0,1) and there is alpha+beta=1；
(6) iteration enables E=E ', Wa=Wa ', is that the blanking next time of this component prepares；
(7) blanking component is replaced, if whole component blankings finish, turns in next step, otherwise, to go to step 2；
(8) discharge valve is opened, so that a formula ratio material of multiple groups part material composition falls into blending bucket, material position is read and passes
The state of sensor, if detecting, material position is more than given threshold, controls blender Stirring, multiple groups part material is uniformly mixed
Afterwards, push plate is opened, mixed material is exported from conveying pipeline；
(9) if default blanking batch has been completed, terminate blanking；Otherwise, component is set as the first component, turned
Step 2.
During blanking, controller is also analyzed by the calculating of adjust the distance sensor and Weighing module signal, in blanking bin
Material heap form be measured in real time, if finding improper blanking, rotatable vibrating arm is ordered to act in time, when ensureing blanking
Entirety be uniformly distributed.
Preferably, further comprising the steps of in the blanking control of ingredient:
(a) it is sorted from large to small by the value of discharge quantity Ws of each component, determines the blanking order of each component；
(b) for digitial controller, as time t >=t0+0.85Ws/d, controller forbids the institute in addition to security response
There is external interrupt；
(b) when detecting blending bucket material position, blender discontinuously one small fan angle of multiple rotary reads the shape of level sensor
State just carries out mixing stirring if having material position always is more than given threshold, full material false when being unevenly distributed to prevent material heap.
Before continuous blanking, also to perform the following operation:
(i) by test experiment, Weighing module and range sensor are demarcated；
(ii) parameter setting, including a secondary amounts, formula table, batch value, blanking rate are carried out by the touch screen of controller
The duration Tb and number of repetition of calibration, stablize weighing delay Td；
(iii) blanking calibration is carried out to each component: operates spiral shell by or with reference to speed governing curve shown in Fig. 9 since 0 moment
Conveyer certain time length Tb is revolved, the auger conveyor Tb moment is being closed and the Tb+Td moment after stablizing of weighing, is reading and remember respectively
Record the weight value Wcb and Wdb of Weighing module；After repeatedly, the blanking rate d=AVG [Wdb/ (Tb- of this component is calculated
ts)]/λ, air weighting initial value Wa=AVG (Wdb-Wcb).
Blanking is carried out using the method for the present invention, Figure 10-12 gives the result of blanking.Wherein, Figure 10 show 4 kinds of components
Material distribution schematic diagram when blanking in weighing hopper.Figure 11 is mould of weighing in 900ms duration material dropping process of a component
The change curve of block reading, wherein abscissa is the delay time closed after auger conveyor.Therefrom as it can be seen that due to impact force
Effect, weighing reading will overshoot, be then just returned to actual weight；Also, after auger conveyor closes about 700ms
Aerial material just falls completely within weighing hopper, and Weighing module reading tends towards stability.
Figure 12 is the statistics of one-component material drafting error in blanking process of the present invention, it can be seen from the figure that due to repeatedly
The factor of accumulated error is considered in generation prediction, therefore, not only drafting error can level off to 0, by iteration several times, accumulated error
Also it gradually restrains.Therefore, compared to other iterative learnings, this method does not need to discard the material in iterative learning procedure, and
It is that may be directly applied to subsequent production, so being suitable for the quick ingredient blanking of small lot.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (8)
1. screw multiple groups part proportioning materials method comprising following steps:
S1, according to a secondary amounts and each formula rate, a discharge quantity Ws of each component is determined, to the accumulation drafting error of each component
E assigns initial value 0；Current component is set as the first component；
S2, the blanking since blanking bin to current component, controller read the sensed values of the Weighing module of support weighing hopper, record
The initial weight G0 of weighing hopper starts auger conveyor and with μ amaxAcceleration accelerates, when speed reaches vH=λ vRShi Bao
It is constant to hold speed, record starts the moment as t0；
Wherein, amaxFor the specified peak acceleration of screw rod of auger conveyor, vRFor maximum speed, μ is adding between 0.5~0.9
Velocity coeffficient, λ are the velocity coeffficient between 0.85~1.0；
S3, when detecting that weighing hopper weight reaches G0+Ws-Wa-0.5 λ dtsWhen, begin to shut off auger conveyor and with
μ·amaxAcceleration reduces speed now, until stopping；
Wherein, Wa is air weighting predicted value, and d is the blanking rate of auger conveyor when screw rod is operated with maximum speed, tsFor from opening
Begin to slow down the moment to the time span between the stop timing, ts=λ vR/μ·amax；
S4, it waits material to fall to weighing hopper completely, reads the sensed values of Weighing module, obtain currently practical discharge quantity Wr, count
Calculate this drafting error e=Wr-Ws；
S5, accumulation drafting error E '=E+e is updated, calculated air weighting predicted value Wa '=Wa+ (α e+ β E '), wherein α and β difference
For section (0,1) iteration coefficient and have alpha+beta=1；
S6, iteration, enable E=E ', Wa=Wa ', are that the blanking next time of this component prepares；
S7, replacement blanking component turn in next step, otherwise, to go to step S2 if whole component blankings finish；
S8, the discharge valve for opening weighing hopper bottom are read so that a formula ratio material of multiple groups part material composition falls into blending bucket
The state of level sensor in blending bucket is taken, material position is more than given threshold if detecting, blender rotation in order blending bucket
Stirring after mixing by multiple groups part material opens the push plate of blending bucket bottom, and mixed material is exported from conveying pipeline；
If S9, default blanking batch have been completed, terminate blanking；Otherwise, component is set as the first component, gone to step
S2。
2. screw multiple groups part proportioning materials method according to claim 1, which is characterized in that before the step S1,
There are also following steps:
T1, pass through test experiment, the range sensor in Weighing module and blanking bin is demarcated；
T2, parameter setting is carried out by the touch screen of controller, including a secondary amounts, formula table, batch value, blanking rate self-calibration
Duration Tb and number of repetition stablize weighing delay Td；
T3, blanking calibration is carried out to each component: operates spiral by the speed governing curve of the even even deceleration of acceleration-constant speed-since 0 moment
Conveyer certain time length Tb is closing the auger conveyor Tb moment and the Tb+Td moment after stablizing of weighing, is reading and record respectively
The weight value Wcb and Wdb of Weighing module；After repeatedly, the blanking rate d and air weighting initial value Wa=of this component are calculated
AVG(Wdb-Wcb)。
3. screw multiple groups part proportioning materials method according to claim 1, which is characterized in that further comprising the steps of:
Step S1 further include: sorted from large to small by the value of discharge quantity Ws of each component, determine the blanking order of each component；
Step S3 further include: as time t >=t0+0.85Ws/d, controller is forbidden in all outsides in addition to security response
It is disconnected；
Step S8 further include: blender discontinuously one small fan angle of multiple rotary reads again the state of level sensor, if still
Right material position is more than given threshold, just carries out mixing stirring.
4. screw multiple groups part proportioning materials method according to claim 1, which is characterized in that further comprising the steps of:
The range sensor that rotation is located in blanking bin on the apex angle of nearly frame central carrys out detectable substance burden distribution, and passes through Weighing module
Real-time tracking is carried out to blanking rate, when discovery blanking bin material EDS maps exceed under setting range, or discovery unit time
Rate fluctuation is expected more than after given threshold 5%, control order is fixed on rack and acts close to the vibrating arm of blanking bin side wall,
Adjust the material accumulation form in blanking bin.
5. screw multiple groups part proportioning materials method according to claim 1, which is characterized in that set above the blanking bin
There are storage bin and feed pump, the feed pump is screw feed pump, and there are a material spray head, institute in the outlet of its rear end feed pipe
State material spray head be it is spherical, circular aperture is distributed in surface, and the charging revolution speed is controlled by such as following formula:
Wherein, VInto 0For a setting maximum feed velocity, l is the current material position of blanking bin, LMAnd LmRespectively default highest, most
Low bin-level.
6. screw multiple groups part proportioning materials method according to claim 1, it is characterised in that: set on the top of weighing hopper
One tripper, the tripper is in the hourglass shape tripper that top is that cone lower part is the cone structure flattened, upper part
For opening shape, then only there is slope shape nozzle in lower part at the both ends of length direction；On direction of the weighing hopper towards the nozzle
It is distributed with spherical crown shape sub-material protrusion straggly, material falls into the material in weighing hopper through tripper nozzle and sub-material protrusion when blanking
Heap.
7. screw multiple groups part proportioning materials method according to claim 6, it is characterised in that: the blanking bin bottom has
One pumping board；The auger conveyor includes screw case, conveying screw rod, connector and motor, and the motor housing passes through connection
Device is connected with screw case, and the conveying screw rod in screw case is connected by axle sleeve with motor shaft, screw case upper surface relatively under
Bin bottom opening has a feed inlet, and screw case the other end opposite with motor is also connected with the blanking placed vertically
Pipe, when blanking, open pumping board, and material falls on meter to feeder pipe, then through tripper through auger conveyor from the opening of blanking bin bottom
In material heap in batch box.
8. screw multiple groups part proportioning materials method according to claim 4, it is characterised in that: the vibrating arm include according to
Spring buffer arranged at secondary connected pillar, holder, vibrator, vibration bar, the vibrator bottom, and the vibration bar surface is distributed with
Grain protrusion, vibrating arm act when vibrator starting of oscillation and vibration bar do snakelike agitation.
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