CN86103929A - Automatical ratio control system for applying glue to wood shavings - Google Patents
Automatical ratio control system for applying glue to wood shavings Download PDFInfo
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- CN86103929A CN86103929A CN86103929.7A CN86103929A CN86103929A CN 86103929 A CN86103929 A CN 86103929A CN 86103929 A CN86103929 A CN 86103929A CN 86103929 A CN86103929 A CN 86103929A
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- China
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- wood shavings
- closed loop
- ratio
- flow
- applying glue
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Abstract
The present invention is a kind of core, top layer wood shavings instantaneous delivery of making; Core, top layer wood shavings and core, surface layer adhesive stick instantaneous delivery; Core, surface layer adhesive stick keep a certain proportion of wood shavings applying glue closed loop ratio control system with core, surface solidifying agent instantaneous delivery, this system not only makes certain flow proportional and the tracking of maintenance between each layer tackifier and each layer wood shavings, and makes between core, top layer wood shavings, all keeps certain flow proportional and tracking automatically between each layer hardening agent and each layer tackifier.Total wood shavings flow is basicly stable after also can making applying glue.
Description
The invention relates to the ratio robot control system(RCS) in the wood shavings applying glue.
For particieboard production, wood shavings applying glue control system is one had both influenced product quality, influenced one of important process link of production cost again.Correctly controlling the instantaneous delivery of tackifier and wood shavings, and make the two keep predetermined optimal proportion, is one of important measures that guarantee product quality, reduce production costs and increase economic efficiency.The wood shavings applying glue control system of West Germany " than pine " company is discontinuous detection open loop control mode.It is that to adopt error to be that the metering cylinder of 5% batch scale and two alternations carries out wood shavings weight and tackifier volume respectively quantitative, and it can not carry out continuous detecting and control to the instantaneous delivery of wood shavings and tackifier.Now also has close-loop control mode, though can carry out continuous detecting to the instantaneous delivery of wood shavings and tackifier, and can make tackifier follow the tracks of the wood shavings flow by control device, but core, top layer wood shavings flow can not carry out tracking Control, and the wood shavings flow that has does not add the adjusting closed loop yet.Therefore be unfavorable for that the wood shavings total flow after holding core, top layer wood shavings flow become predetermined ratio and make glue mixing is stable.
For solving the problem of above-mentioned existence, the objective of the invention is designed system and adopted general purpose instrument and device easy to use and that safeguard, constitute core, top layer wood shavings flow and core, surface layer adhesive stick flow regulation closed loop, and core, surface solidifying agent flow regulation closed loop.And it is linked to be an integral body by the ratio setter, constitute wood shavings applying glue ratio control system, it not only makes sandwich layer wood shavings and sandwich layer tackifier flow, top layer wood shavings and surface layer adhesive stick flow reach from motion tracking, can make core, top layer wood shavings flow carry out from motion tracking, thereby product quality is significantly improved again.
Automatical ratio control system for applying glue to wood shavings be by as among the figure six regulate closed loop (I), (II), (III), (IV), (V) and (VI), five ratio setters (11), (26), (26 '), (34) and (34 ') and two delay circuits (25) and (25 ') are formed.Wherein (I) and (II) is core, top layer wood shavings flow regulation closed loop, and (III) and (IV) is core, surface layer adhesive stick flow regulation closed loop, and (V) and (VI) is core, surface solidifying agent flow regulation closed loop.Ratio setter (11) couples together closed loop (I) and (II), delay circuit (25) and ratio setter (26) couple together closed loop (I) and (III), delay circuit (25 ') and ratio setter (26 ') couple together closed loop (II) and (IV), and ratio setter (34) and (34 ') couple together closed loop (III) and (V), (IV) and (VI) respectively.Closed loop (I) and (II) all are made up of belted electronic balance, load sensor, millivolt amplifier (comprising the indication gauge outfit), integrator, regulator, controllable silicon controller and electric vibrating feeder.Closed loop (III) and (IV) all are made up of electromagnetic flow transmitter, electromagnetic flux converter, integrator, regulator, servoamplifier and adjusting pump.Closed loop (V) and (VI) all are made up of electric rotor flow transmitter, converter, regulator, electropneumatic transducer and pneumatic micro-flow regulating valve.Core, top layer wood shavings (1) and (1 ') are delivered in separately the little hopper (3) and (3 ') by travelling belt (2) and (2 '), and by electric vibrating feeder (4) reaches (4 ') to belted electronic balance (5) and (5 ') feed, load sensor (6) and (6 ') are converted to voltage signal after millivolt amplifier (7) and (7 ') amplification with the wood shavings weight flow, become normalized current signal I
F1And I
F2Give integrator (8) and (8 '), ratio setter (11) and regulator (9) and (9 ') respectively.Integrator (8) and (8 ') are used for integrating wood shavings consumption, and ratio setter (11) is used for setting the ratio of core, table wood shavings flow, and regulator (9) and (9 ') are then to representing the current signal I of wood shavings measured discharge
F1And I
F2With the given current signal I that represents the wood shavings predetermined amount of flow
G1And I
G2Compare, and (be deviation signal △ I according to comparative result
1=I
G1-I
F1And △ I
2=I
G2-I
F2) produce an output signal I by certain rule (proportional integral adjusting rule) of regulating
01And I
02, by the blanking amount of controllable silicon controller (10) and (10 ') control electric vibrating feeders (4) and (4 ').When deviation signal is greater than or less than zero, regulator will make corresponding increase of electric vibrating feeder blanking amount or minimizing, until deviation signal is gone to zero, i.e. and I
F1=I
G1, I
F2=I
G2Till.I in native system
G1Can set by process conditions, and be certain value.And I
G2=k
1I
F1Then with I
F1Proportional variation (k
1Be a scale-up factor, set) by ratio setter (11).Always try hard to make I owing to regulate closed loop
F1=I
G1, I
F2=I
G2=k
1I
F1, therefore, having guaranteed that sandwich layer wood shavings flow is basicly stable, top layer wood shavings flow is then from motion tracking sandwich layer wood shavings flow.Adopt the reason of following the tracks of like this to be: because sandwich layer wood shavings particle is bigger, the slight arch formation of generation is arranged in the time of in hopper, though adopted sandwich layer wood shavings flow regulation closed loop, but still can produce certain variation; And top layer wood shavings particle is less and even, should not produce arch formation, can more stably follow the tracks of sandwich layer wood shavings flow.In addition, when needing to change sandwich layer wood shavings predetermined amount of flow when the process conditions change, the setting knob of only adjusting regulator (9) simply promptly changes given signal I
G1, and needn't adjust the predetermined amount of flow of top layer wood shavings, still can make core, top layer wood shavings flow keep predetermined ratio.Core, surface layer adhesive stick flow are respectively by electromagnetic flow transmitter (16) and (16 ') and electromagnetic flux converter (21) and (21 ') detection.The normalized current signal I that converter produced
F3And I
F4Respectively with given signal I
G3And I
G4Compare, corresponding current signal I is exported according to comparative result in regulator (23) and (23 ')
03And I
04After servoamplifier (24) and (24 ') amplification, the rotating speed of control motorized adjustment pump (17) and (17 ') is to change for the glue amount.Integrator (22) and (22 ') are added up core, surface layer adhesive stick flow respectively.Given signal I
G2And I
G4Numerically with I
F1And I
F2Proportional, i.e. I
G3=k
2I
F1, I
G4=k
3I
F2, but a period of time t that lags in time
0, k wherein
2, k
3Be scale-up factor, set by ratio setter (26) and (26 ').Time t lags
0, then produce by delay circuit (25) and (25 ').t
0For wood shavings are sent to the required time of glue mixer feeding mouth from the electric vibrating feeder discharging point through belted electronic balance.The effect of delay circuit is that the tackifier that enters glue mixer and the flow of wood shavings are changed synchronously.Delay circuit is made up of sampling delay control switching circuit and dry-reed relay matrix contact connecting circuit.The sampling delay control switching circuit is made up of frequency-voltage converter, potentiometer, voltage-frequency converter, electronic counter and dry-reed relay matrix, and wherein electronic counter comprises parts such as counting, decoding and driving circuit.Principle time delay that delay circuit produces is: (1) is to accept power frequency component and defeated one and the proportional d. c. voltage signal of power frequency component frequency among Fig. 2.Because mains frequency changes, must make the proportional variation of belt speed of belt conveyer scale, thereby make material transmit formed retardation time of t through the belt of belt conveyer scale
0Also change thereupon.As not adopting power frequency component control sample frequency and time delay, must influence tracking effect.Potentiometer (2) can change the size of the input direct voltage that adds to voltage one frequency converter (3) artificially, thereby artificially adjusts the frequency output signal of voltage one frequency converter, makes it to produce accurate time delay of t to reach artificial adjustment sample frequency
0Purpose.Voltage-frequency converter (3) produces the sampling pulse of corresponding frequencies, under the sampling pulse effect, make successively through electronic counter (4) and (6) dry-reed relay magnetizing coil 1J, 2J in the dry-reed relay matrix ... the 25J circulation switches on and off.Be series at each diode in the magnetizing coil, guarantee to have only at any one time a dry-reed relay adhesive.In Fig. 3,1J and 1J ', 2J and 2J ' ... 25J and 25J ' be respectively dry-reed relay 1J, 2J ... two contact switchs of 25J, wherein 1J, 2J ... 25J adds to capacitor C respectively with input voltage signal
1, C
2C
25In, 1J ', 2J ' ... 25J ' is the time t through lagging behind then
0After capacitor institute stored voltage signal is led to BG
2Base stage, and export through emitter.BG
2Emitter a fixedly starting potential will be provided, can be used to adjust zero point.Because capacitor C
1, C
2... C
25Respectively with contact switch 1J and 25J ', 2J and 1J ', 3J and 2J ' ... 25J and 24J ' are connected, therefore, when input voltage signal by BG
1Emitter through 1J, 2J ... 25J is successively to capacitor C
1, C
2C
25After the charging, through a circulation through 25J ', 1J ', 2J ' ... 24J ' is successively with capacitor C
1, C
2... C
25On voltage signal draw, thereby cause needed time delay of t
0But it is proportional with input signal that the size of output signal still keeps, and wherein capacitor C is used for the unnecessary high-frequency voltage signal of elimination, and makes pulse signal level and smooth.In actual use, determine the number of the electromagnetic relay in the dried spring electromagnetic relay matrix according to the concrete condition of belt conveyer scale.As the t retardation time of belt conveyer scale
0When big, can increase its number, otherwise then can reduce.Under the regulating action of regulating closed loop (III) and (IV), core, surface layer adhesive stick flow will be consistent with the predetermined amount of flow of core, surface layer adhesive stick all the time, even I
F3=I
G3, I
F4=I
G4And the predetermined amount of flow of core, surface layer adhesive stick then changes pro rata with core, top layer wood shavings flow, i.e. I
G3=k
2I
F1, I
G4=k
3I
F2Therefore, core, surface layer adhesive stick flow change pro rata with core, top layer wood shavings flow, have promptly realized from motion tracking.In this simultaneously, hardening agent (29) flows into glue mixers (18) reach (18 ') through electric rotor flow transmitter (30) and (30 ') and tiny flow quantity pneumatic control valve (35) and (35 ') from storage tank (28).Converter (31) and (31 ') then are converted to normalized current signal I with the voltage signal that transmitter (30) reaches (31 ') to be produced
F5And I
F6, and send in regulator (32) and (32 ').Regulator (32) and (32 ') are then with signal I
F5And I
F6Respectively with given signal value I from ratio setter (34) and (34 ')
G5And I
G6Compare, and produce output signal I by certain rule of regulating according to comparative result
05And I
06, produce standard pressure signal (0.2-1kg/em through electropneumatic transducer
2) control the aperture that tiny flow quantity pneumatic control valve (35) reaches (35 '), make hardening agent flow respective change.Because given signal I
G5And I
G6With the current signal I that represents the tackifier flow
F3And I
F4Therefore proportional variation makes I
F5And I
F6Also with I
F2And I
F4Proportional variation is even hardening agent flow and tackifier flow reach from motion tracking.The ratio of the two is set by ratio setter (34) and (34 ').Water-proofing agent is squeezed in the storage glue jar with after tackifier mixes in the impregnation jar, does not set up control system.
Advantage of the present invention is, automatical ratio control system for applying glue to wood shavings not only makes the certain flow proportional of maintenance between each layer tackifier and each layer wood shavings, and makes between core, top layer wood shavings and all can keep certain flow proportional automatically between each layer hardening agent and each layer tackifier.Can also make sandwich layer wood shavings and sandwich layer tackifier flow, top layer wood shavings and surface layer adhesive stick flow reach from motion tracking, and core, top layer wood shavings flow are carried out from motion tracking, and hardening agent flow and tackifier flow are reached from motion tracking.Total wood shavings flow is basicly stable after the wood shavings applying glue.Native system has manually and automatic switching control equipment, is convenient to operation, produces the characteristics such as quality height of particieboard.
Accompanying drawing 1, be the automatical ratio control system for applying glue to wood shavings structure principle chart, wherein 1,1 '-core, the top layer wood shavings, 2,2 '-travelling belt, 3,3 '-little hopper, 4,4 '-electric vibrating feeder, 5,5 '-belted electronic balance, 6,6 '-load sensor, 7,7 '-millivolt amplifier (comprising gauge outfit), 8,8 '-proportional accumulator, 9,9 '-regulator, 10,10 '-controllable silicon controller, 11-ratio setter, 12-glue jar, 13-tackifier (containing water-proofing agent), 14,14 '-reverse flow valve, 15,15 '-gumming pump, 16,16 '-electromagnetic flow transmitter, 17,17 '-the motorized adjustment pump, 18,18 '-glue mixer, 19,19 '-the glue box, 20,20 '-the belted electronic balance fulcrum, 21,21 '-electromagnetic flux converter, 22,22 '-proportional accumulator, 23,23 '-regulator, 24,24 '-servoamplifier, 25,25 '-delay circuit, 26,26 '-the ratio setter, the 27-picnometer, 28-hardening agent storage tank, 29-hardening agent, 30,30 '-the electric flow transmitter, 31,31 '-the electric flow converter, 32,32 '-regulator, 33,33 '-electropneumatic transducer, 34,34 '-the ratio setter, 35,35 '-pneumatic micro-flow regulating valve.
Fig. 4 is the schematic diagram of frequency-voltage converter, potentiometer and voltage-frequency converter among Fig. 2, and 1-is a frequency-voltage converter, 2-potentiometer, 3-voltage-frequency converter
The adoptable embodiment of native system is to produce the wood shavings applying glue closed loop ratio control system of 10000 cubic metres of particieboards per year.System adopts μ CP-1 type micro computer electronics belt conveyer scale to detect core, top layer wood shavings flow.This scale measuring error is 0.5%, and peeling is heavy automatically, and off-limit alarm is arranged, and can compensate belt speed automatically and change the influence that is caused.Calculate according to process conditions, core, top layer wood shavings (water percentage is made as 4.5%) flow are 832.59 kilograms/hour and 353 kilograms/hour.The range of belt conveyer scale is elected as respectively: 0.3～1.44 ton/hour and 0.15-0.72 ton/hour.Core, surface layer adhesive stick flow are: 157.6 liters/hour and 67.54 liters/hour, select VKA electromagnetic flow transmitter and VSB electromagnetic flux converter for use.The range of core, top layer electromagnetic flow transmitter is respectively 0～280 liter/hour and 100 liters/hour, this Watch Error is that ± 0.5% core, surface solidifying agent flow are 69 ml/min and 30 ml/min, can select LZS-10 electric rotor flow transmitter and LZSZ converter for use.Optional DTL-231A of the employed regulator of system or DTL-321A; The optional ZB type of motorized adjustment pump, core, top layer select 5 liters/minute and 3 liters of/minute cores, top layer electric vibrating feeders to select DZ respectively
2And DZ
1Type.Pneumatic control valve selects ZMAY-16B, 20 millimeters of latus rectums, and core, top layer negotiability are respectively: 0.008 and 0.0032.The optional DXS-102 type of tackifier integrator proportional-type proportional accumulator, the wood shavings integrating is carried by belt conveyer scale.Electricity vapour converter selects the DQ-2 type, and the ratio setter selects the DGB-01 type, but its ratio coefficient people is for being set at:
1, the ratio coefficient between top layer and the sandwich layer wood shavings:
k
1=(sandwich layer wood shavings maximum flow * top layer wood shavings flow)/(top layer wood shavings maximum flow * sandwich layer wood shavings flow)=0.85
2, the ratio coefficient between sandwich layer glue and the sandwich layer wood shavings:
k
' 2=(sandwich layer wood shavings maximum flow * sandwich layer solation amount)/(sandwich layer glue maximum flow * sandwich layer wood shavings flow)=0.97
3, identical in this, the ratio coefficient between surface layer adhesive and the top layer wood shavings is: k
' 3=1.38
Ratio coefficient between sandwich layer hardening agent and the sandwich layer glue is k
' 4=0.335
Ratio coefficient between surface solidifying agent and the surface layer adhesive is k
' 5=0.26
Each instrument is installed, is used and should be undertaken by instrucment and meter plant's operation instructions.
Frequency-voltage converter in the delay circuit can be substituted by the frequency converter in the μ CP-1 type belted electronic balance, being about to its output voltage draws, and deliver in the voltage-frequency converter through potentiometer again, voltage to frequency converter then as shown in Figure 4, each component data can or be selected similar products for use with reference to accumulative total circuit part in this scale.Dry-reed relay can adopt JAG-19 or other products, and the number of the dry-reed relay in the dry-reed relay matrix will be according to practical condition, and promptly the actual hysteretic time is determined, can suitably increase or reduce.Optional variable carry counting system device of electronic counter or binary-decimal, two-five carry counting system devices.Also to determine by the actual hysteretic time.Capacitor C
1, C
2... C
25Capacity should be consistent, according to optional 0.05～0.1 μ F of sampling time.The tantalum electric capacity that preferably leaks electricity little.BG
1, BG
2, BG
3Optional 3DG crystalloid triode.
Claims (6)
1, a kind of stepless control wood shavings and proportional system of tackifier that regulates closed loop that comprise.The present invention is characterised in that automatical ratio control system for applying glue to wood shavings includes six and regulates closed loop (I), (II), (III), (IV), (V) and (VI), five ratio setters (11), (26), (26 '), (34) and (34 ') and two delay circuits (25) and (25 ').Ratio setter (11) couples together closed loop (I) and (II), delay circuit (25) and ratio setter (26) couple together closed loop (I) and (II), delay circuit (25 ') and ratio setter (26 ') couple together closed loop (II) and (IV), and ratio setter (34) and (34 ') couple together closed loop (III) and (V), (IV) and (VI) respectively.
2, automatical ratio control system for applying glue to wood shavings according to claim 1 is characterized in that regulating closed loop (I) and (II) and all is made up of electronic belt section, load sensor, millivolt amplifier (comprising the indication gauge outfit), integrator, regulator, controllable silicon controller and electric vibrating feeder.
3, automatical ratio control system for applying glue to wood shavings according to claim 1 is characterized in that regulating closed loop (III) and (IV) and all is made up of electromagnetic flow transmitter, electromagnetic flux converter, integrator, regulator, servoamplifier and adjusting pump.
4, automatical ratio control system for applying glue to wood shavings according to claim 1 is characterized in that regulating closed loop (V) and (VI) and all is made up of electric rotor flow transmitter, converter, regulator, electric vapour converter and pneumatic micro-flow regulating valve.
5, automatical ratio control system for applying glue to wood shavings according to claim 1 is characterized in that delay circuit is made up of sampling delay control switching circuit and dry-reed relay matrix contact connecting circuit.
6, according to the automatical ratio control system for applying glue to wood shavings of claim 1 or 5, it is characterized in that the sampling delay control switching circuit is made up of FV convertor, potentiometer, voltage to frequency converter, electronic counter and dry-reed relay, dry-reed relay contact connecting circuit is made up of the electric capacity and the transistor emitter follower of dry-reed contact switch, storage voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN86103929A CN1015575B (en) | 1986-06-07 | 1986-06-07 | Automatical ratio control system for applying glue to wood shavings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN86103929A CN1015575B (en) | 1986-06-07 | 1986-06-07 | Automatical ratio control system for applying glue to wood shavings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86103929A true CN86103929A (en) | 1987-05-20 |
| CN1015575B CN1015575B (en) | 1992-02-19 |
Family
ID=4802245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN86103929A Expired CN1015575B (en) | 1986-06-07 | 1986-06-07 | Automatical ratio control system for applying glue to wood shavings |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1015575B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100371152C (en) * | 2005-01-26 | 2008-02-27 | 东北林业大学 | Parallel on-line fuzzy adaptive glue compounding and applying control method and system for man-made board |
| CN101733785B (en) * | 2008-11-18 | 2012-10-17 | 东北林业大学 | Dynamic area optimization and control system of glue mixing and applying of planed fiber artificial board |
-
1986
- 1986-06-07 CN CN86103929A patent/CN1015575B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100371152C (en) * | 2005-01-26 | 2008-02-27 | 东北林业大学 | Parallel on-line fuzzy adaptive glue compounding and applying control method and system for man-made board |
| CN101733785B (en) * | 2008-11-18 | 2012-10-17 | 东北林业大学 | Dynamic area optimization and control system of glue mixing and applying of planed fiber artificial board |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1015575B (en) | 1992-02-19 |
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