CN114769079B - Quick pressure stabilizing control method for hot melt adhesive - Google Patents
Quick pressure stabilizing control method for hot melt adhesive Download PDFInfo
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- CN114769079B CN114769079B CN202210175078.1A CN202210175078A CN114769079B CN 114769079 B CN114769079 B CN 114769079B CN 202210175078 A CN202210175078 A CN 202210175078A CN 114769079 B CN114769079 B CN 114769079B
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- pressure
- glue
- air
- regulating device
- air pressure
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000004831 Hot glue Substances 0.000 title claims abstract description 15
- 230000000087 stabilizing effect Effects 0.000 title claims description 6
- 239000003292 glue Substances 0.000 claims abstract description 69
- 230000001105 regulatory effect Effects 0.000 claims abstract description 27
- 239000000853 adhesive Substances 0.000 claims abstract description 3
- 230000001070 adhesive effect Effects 0.000 claims abstract description 3
- 238000012937 correction Methods 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 2
- 230000004044 response Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 206010034016 Paronychia Diseases 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
- B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
- B05C11/1007—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to condition of liquid or other fluent material
- B05C11/1013—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to condition of liquid or other fluent material responsive to flow or pressure of liquid or other fluent material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/001—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work incorporating means for heating or cooling the liquid or other fluent material
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention relates to the field of hot melt adhesive dispensing, in particular to a rapid and accurate adhesive pressure control method, which comprises the following steps: a1, acquiring the glue pressure of the air pressure and pneumatic pressure regulating device output by the air quantity regulating device, and establishing an air pressure and glue pressure model; a2, establishing the air pressure output by the air quantity regulating device by utilizing the force balance principleP in Glue pressingP out Relation of (2)The method comprises the steps of carrying out a first treatment on the surface of the A3, collecting the glue pressure in real time and combining the formulaAnd correcting the output air pressure of the air quantity regulating device by a PID algorithm to obtain accurate air pressure P , in . According to the invention, the glue pressure is detected in real time, the required air pressure is corrected through the PID algorithm, so that the error between the glue supply pressure and the set pressure is within 2kpa within 1 second, and the stable glue dispensing effect and the accurate glue outlet amount are ensured in the glue dispensing process of hot glue.
Description
Technical Field
The invention relates to the field of hot melt adhesive dispensing, in particular to a hot melt adhesive rapid pressure stabilizing control method.
Background
The hot melt adhesive machine is electromechanical equipment capable of melting solid hot melt adhesive and conveying the melted liquid adhesive to a coating device to coat a substrate through a pressurizing device, and integrates the functions of temperature heating control, pressurizing, liquid conveying and extrusion coating. The pressurizing function of the traditional process is realized by a variable frequency motor and a pressure relief device; when the required glue pressure is large, the motor rotating speed is increased, and when the required glue pressure is small, the motor rotating speed is reduced; the pressure relief valve ensures that the pressure of the rubber pipe is always below the safety pressure; the motor has the defects of low response speed to pressure and low precision, and the motor is required to regulate pressure and circulate glue, so that the stability of the glue output is greatly influenced.
Disclosure of Invention
Aiming at the problems existing in the prior art: according to the invention, the mechanical pneumatic pressure regulating device is used for regulating the glue pressure, and the required output air pressure is accurately calculated through the model, so that the accurate glue pressure is ensured when the field of hot melting machines is applied.
The technical scheme adopted for solving the technical problems is as follows: a hot melt adhesive rapid pressure stabilizing control method comprises the following steps:
a1, the mechanical structure is an air quantity adjusting device and a pneumatic pressure adjusting device, and a model relation between air pressure and glue pressure is established;
P in the output air pressure of the air quantity adjusting device is also the input air pressure of the pneumatic pressure adjusting device; the piston mechanism of the pneumatic pressure regulating device moves to regulate the flow of glue, so as to regulate the pressure of the glue, namely the glue pressure P out ；
A2, establishing the air pressure P output by the air quantity regulating device by utilizing the force balance principle in And glue pressure P out Relation P of (2) in ＝k·P out +b, where k is the proportionality coefficient, b is the mechanism friction component;
in consideration of tightness, the outer diameter of the piston is added with a high-temperature sealing ring, so that a large friction force is generated between the high-temperature sealing ring and the inner wall of the pneumatic pressure regulating device when the piston moves, and the friction force is expressed as f;
when the required glue pressure rises:
P in ×S1＝P out ×S2+f
P in＝ P out ×(S2/S1)+f/S1 (1)
when the required glue pressure drops:
P in ×S1+f＝P out ×S2
P in＝ P out ×(S2/S1)-f/S1 (2)
then k=s2/S1, b= ±f/S1;
s1 is the pressure side stressed area of the pneumatic pressure regulating device, and S2 is the pressure side stressed area of the pneumatic pressure regulating device;
a3, collecting the glue pressure in real time, and combining the formula P in ＝k·P out +b and correcting the output air pressure of the air quantity regulating device by a PID algorithm to obtain accurate air pressure P' in ；
A31, the controller determines the target glue pressure P at a certain moment according to the glue pressure data set by the external machine table t ；
The machine is provided with the glue pressure data in 0-10V analog quantity, wherein 0V corresponds to the glue pressure 0, and 10V corresponds to the maximum glue pressure P max The method comprises the steps of carrying out a first treatment on the surface of the If the detected voltage at a certain moment is V o Then the target glue pressure P t ：
P t ＝V o ×P max /10 (3)
A32, establishing a PID experience data set by actually measuring the glue pressure; the data set is based on the target glue pressure P t And measuring the glue pressure P out Is divided into 4 adjustment gears, and a relation table of the difference, the detection period, kp, ki, kd and the limiting amplitude is established, as shown in Table 1:
TABLE 1 pressure differential, detection period, kp, ki, kd and Limited amplitude relationship Table
A33, according to the target glue pressure and the measured glue pressure difference value, looking up a table to obtain a proportion coefficient K p Integral coefficient K i And differential coefficient K d ；
K p 、K i 、K d The function of (2) is as follows:
(1) Scaling factor K p The system has the functions of accelerating the response speed of the system and improving the adjustment precision of the system; k (K) p The larger the response speed of the system is, the higher the adjusting precision of the system is, but the overshoot is easy, and even the system is unstable; k (K) p If the value is too small, the adjusting precision is reduced, and the response speed is reduced;
(2) Integral coefficient K i The function of (2) is to eliminate steady state errors of the system; k (K) i The larger the system is, the faster the static error of the system is eliminated, but the integral saturation phenomenon is generated at the initial stage of the response, thereby leading toOvershoot, K i Too small, static errors are difficult to eliminate, and the adjustment accuracy is affected;
(3) Differential coefficient K d The dynamic characteristics of the system are improved, and the dynamic characteristics mainly inhibit the variation of the deviation in any direction in the response process, so as to adjust the variation of the deviation in advance; but K is d When the response process is overlarge, the response process is braked in advance, and the anti-interference performance is reduced;
a34, calculating an output correction value delta u of the air quantity adjusting device according to the incremental PID; correction value Deltau and air pressure P output in step A2 in Adding to obtain new air pressure P' in ；
n time discrete PID formula:
then the n-1 time discrete PID is:
Δu[n]＝u[n]-u[n-1]
order theIs an integral coefficient; />The above can be simplified to a differential coefficient
Δu[n]＝K p {e[n]-e[n-1]}+K i e[n]+K d {e[n]-2e[n-1]+e[n-2]}
The PID control program samples with a detection period T, wherein n is a sampling sequence number, e [ n ]]Target glue pressure P for nth sample t And the current glue pressure P out Is a difference in (2);
modifying the output quantity of the current air quantity regulating device according to the calculated correction value Deltau of the air quantity regulating device;
for each increment, the adjustment amplitude is limited in order to prevent overshoot.
The invention has the beneficial effects that:
1. the glue pressure is detected in real time, and the required air supply pressure is corrected through a PID algorithm, so that the error of the glue supply pressure and the set pressure is within 2kpa within 1 second, and the stable glue dispensing effect and the accurate glue outlet amount are obtained in the glue dispensing process of hot glue.
Drawings
FIG. 1 is a flow chart of a method for controlling the rapid pressure stabilization of a hot melt adhesive according to the invention;
FIG. 2 shows a pneumatic pressure regulating device of the present invention.
Detailed Description
The invention relates to a hot melt adhesive rapid pressure stabilizing control method, which comprises the following steps:
a1, the mechanical structure is an air flow regulating device and a pneumatic pressure regulating device, a model relation between air pressure and glue pressure is established, as shown in fig. 2, the air flow regulating device is a FELON FLT35 with a proportional valve model, and the proportional valve is connected with the input end of the pneumatic pressure regulating device; the theoretical value of the air supply pressure of the proportional valve FELON FLT35 is 600kpa, the output air pressure is 0-500 kpa, and the rotating speed of the motor is set to be constant at 70 rpm;
data for the test of the glue pressure and the air pressure when the glue pressure was increased are shown in table 2:
TABLE 2 air feed pressure and glue pressure test data (Unit kpa) when glue pressure was increased
| Glue pressure P out | 12 | 56 | 135 | 215 | 288 | 367 | 440 | 525 |
| Air pressure P in | 50 | 100 | 150 | 200 | 250 | 300 | 350 | 400 |
Data for the test of gel pressure and air pressure as the gel pressure decreases are shown in table 3:
TABLE 3 air feed pressure and gel pressure test data (in kpa) as gel pressure drops
| Glue pressure P out | 525 | 464 | 408 | 312 | 262 | 197 | 86 | 35 |
| Air pressure P in | 400 | 350 | 300 | 250 | 200 | 150 | 100 | 50 |
A2, establishing the air pressure P output by the air quantity regulating device by utilizing the force balance principle in And glue pressure P out Relation P of (2) in ＝k·P out +b, where k is the proportionality coefficient, b is the mechanism friction component;
linear fitting is carried out on the measured values of the table 2 when the glue pressure rises, and P is taken in ＝0.81×P out +20 (5)
Linear fitting of the measurements of Table 3 as the gel pressure drops, taking P in ＝0.81×P out -20 (6)
A3, collecting analog channel signals with voltage of 0-10V, and calculating the current target glue pressure P through the method (3) t The method comprises the steps of carrying out a first treatment on the surface of the Will P t As P out Substituting the initial value into formulas (5) and (6) to calculate the air pressure P of the initial air quantity regulating device in The method comprises the steps of carrying out a first treatment on the surface of the Collecting the glue pressure P in real time out According to the current setting glue pressure P t And collecting the glue pressure P in real time out The corresponding PID coefficients Kp, ki, kd and detection period T are obtained from Table 1; calculating an adjustment amount Deltau from the formula (4) by using an incremental PID, performing corresponding amplitude limitation on the adjustment amount, and then performing current air pressure P in +Deltau as the new air pressure value P' in And a write-in air quantity adjusting device.
The method provided by the invention tests the low-viscosity glue and the high-viscosity glue respectively, and can stabilize the glue supply pressure within 1 second, and the pressure precision is 2kpa.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (3)
1. The quick pressure stabilizing control method for the hot melt adhesive is characterized by comprising the following steps of:
a1, acquiring the glue pressure of the air pressure and pneumatic pressure regulating device output by the air quantity regulating device, and establishing an air pressure and glue pressure model;
a2, establishing the air pressure P output by the air quantity regulating device by utilizing the force balance principle in And glue pressure P out Relation P of (2) in ＝k·P out +b, where k is the proportionality coefficient, b is the mechanism friction component;
a3, collecting the glue pressure in real time, and combining the formula P in ＝k·P out The +b and PID algorithm corrects the output air pressure of the air quantity adjusting device to obtain accurate air pressure P' in 。
2. The method for controlling the rapid pressure stabilization of hot melt adhesive according to claim 1, wherein the method comprises the following steps: the proportionality coefficient k=s2/S1, the mechanism friction force component b= ±f/S1; wherein S1 is the pressure side stress area of the pneumatic pressure regulating device, S2 is the pressure side stress area of the pneumatic pressure regulating device, and f is the friction force between the high-temperature sealing ring and the inner wall of the pneumatic pressure regulating device.
3. The method for controlling the rapid pressure stabilization of hot melt adhesive according to claim 1, wherein the adhesive pressure is collected in real time and is combined with a formula P in ＝k·P out The +b and PID algorithm corrects the output air pressure of the air quantity adjusting device to obtain accurate air pressure P' in The method comprises the following steps:
a31, the controller determines the target glue pressure P at a certain moment according to the glue pressure data set by the external machine table t ；
Target glue pressure P t ＝V o ×P max /10 (3)
Wherein V is o For a detected voltage at a certain moment, P max The voltage is 10V corresponding to the glue pressure;
a32, according to the measured glue pressure P out And a target glue pressure P t Establishing a PID experience data set;
a33, according to the target glue pressure and the measured glue pressure difference value, looking up a table to obtain a proportion coefficient K p Integral coefficient K i And differential coefficient K d ；
A34, calculating an output correction value Deltau of the air quantity adjusting device according to the incremental PID, and the correction value Deltau and the air pressure P in the step A2 in Adding to obtain the adjusted air pressure P' in 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210175078.1A CN114769079B (en) | 2022-02-25 | 2022-02-25 | Quick pressure stabilizing control method for hot melt adhesive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210175078.1A CN114769079B (en) | 2022-02-25 | 2022-02-25 | Quick pressure stabilizing control method for hot melt adhesive |
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| Publication Number | Publication Date |
|---|---|
| CN114769079A CN114769079A (en) | 2022-07-22 |
| CN114769079B true CN114769079B (en) | 2024-02-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210175078.1A Active CN114769079B (en) | 2022-02-25 | 2022-02-25 | Quick pressure stabilizing control method for hot melt adhesive |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009272511A (en) * | 2008-05-09 | 2009-11-19 | Mimaki Engineering Co Ltd | Wiring forming apparatus, and wiring forming method |
| DE102011121200A1 (en) * | 2011-12-16 | 2013-06-20 | Robert Bosch Gmbh | Air flow control method of pneumatic compressed air delivering device of spray nozzle used in lacquer painting plant, involves inputting input value to pressure control device by pilot device, to adjust control values of pneumatic line |
| CN108153006A (en) * | 2017-12-29 | 2018-06-12 | 深圳市华星光电技术有限公司 | A kind of glue spreading apparatus and glue spreading method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012209314B4 (en) * | 2012-06-01 | 2015-04-02 | Albert-Ludwigs-Universität Freiburg | Device and method for dispensing or receiving a liquid volume |
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- 2022-02-25 CN CN202210175078.1A patent/CN114769079B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009272511A (en) * | 2008-05-09 | 2009-11-19 | Mimaki Engineering Co Ltd | Wiring forming apparatus, and wiring forming method |
| DE102011121200A1 (en) * | 2011-12-16 | 2013-06-20 | Robert Bosch Gmbh | Air flow control method of pneumatic compressed air delivering device of spray nozzle used in lacquer painting plant, involves inputting input value to pressure control device by pilot device, to adjust control values of pneumatic line |
| CN108153006A (en) * | 2017-12-29 | 2018-06-12 | 深圳市华星光电技术有限公司 | A kind of glue spreading apparatus and glue spreading method |
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| CN114769079A (en) | 2022-07-22 |
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