CN101337429A - High-precision inner-cooling automatic control system - Google Patents
High-precision inner-cooling automatic control system Download PDFInfo
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- CN101337429A CN101337429A CNA200810012737XA CN200810012737A CN101337429A CN 101337429 A CN101337429 A CN 101337429A CN A200810012737X A CNA200810012737X A CN A200810012737XA CN 200810012737 A CN200810012737 A CN 200810012737A CN 101337429 A CN101337429 A CN 101337429A
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- control system
- blower fan
- air
- bubble
- automatic control
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Abstract
The invention relates to a high-precision automatic internal cooling control system for an internal mixer. An air inlet fan and an air exhaust fan are variable frequency type fans; a fixed specified value is provided for the rotating speed of the air exhaust fan according to the production technique; three to six ultrasonic sensors are arranged on the circumference above a bubble cooling line; after a signal of distance between the ultrasonic sensors to the bubble is measured and acquired, the signal is transmitted to a controller; the actual value of the bubble breadth is calculated through the controller; the actual value of the bubble breadth is compared with the specified value of the breadth; PID operation is performed to the differential value through an amplifier; a control signal is output to an air inlet fan frequency converter; the frequency converter controls the rotating speed of the air inlet fan, so that the air inlet amount and the air exhaust amount are maintained in balance. The control system has the advantages that the operation and the use are simple, the maintenance is convenient, the running is stable and reliable, the control precision is high, a large amount of raw materials is saved for the users, and the production cost is greatly reduced.
Description
One, technical field:
The present invention relates to the plastic membrane blowing unit, particularly the inner cold system of plastic membrane blowing unit.
Two, background technology
The effect of plastic membrane blowing unit inner-cooling automatic control system has two, and the first is the size of controlling diaphragm bubble automatically, thereby guarantees the precision of goods fabric width, its two cooling velocity that can improve film.The fabric width of multilayer packing membrane is less, is generally 550mm, and just vesicle diameter only is 175mm.The film bubble means that for a short time gas-storing capacity is little, and will reach better cooling effect, and then ventilation volume will reach very high.The difficult point of heavily packing cold control in the unit is just, under above-mentioned primary condition, when guaranteeing better cooling effect, the fabric width precision of nonstick system of control product, the height of fabric width precision directly has influence on goods and gets the effect of thickness and precision, rolling and the effect of follow-up printing; And fabric width precision height can economize in raw materials, and then reduces cost greatly.At present domestic inner-cooling automatic control system generally only can reach error ± 5mm is with interior level, and the less stable in this accuracy rating, can not reach the required precision of multilayer packing membrane, low precision, must cause product percent of pass low, waste raw material, increase cost.
Three, summary of the invention:
The objective of the invention is to overcome above-mentioned not enough problem, a kind of high precision in control system is provided, good cooling results and fabric width precision height, simple to operate, reliable.
The technical scheme that the present invention is adopted for achieving the above object is: high-precision inner-cooling automatic control system, material is through extruder, head processing is extruded the back and is formed the film bubble, flat through the herringbone plate holder, involve by last carry-over pinch rolls, there are wind inlet channel and wind output channel to be communicated with air intake blower fan and air draft blower fan respectively in the head, there are air inlet and air outlet in film mouth place, air intake blower fan and air draft blower fan are the frequency conversion type blower fan, the set-point that the air draft rotation speed of fan is fixed according to production technology given, above film bubble cooling line, a week settle three to six ultrasonic sensors, gather the distance signal of ultrasonic sensor by measuring to the film bubble, transmit signals to controller (for example PLC), via controller calculates membrane bubble fabric width actual value, film is steeped the fabric width actual value and the fabric width set-point compares, its difference is carried out the PID computing through pi regulator, outputs control signals to the air intake blower fan frequency converter, the rotating speed of Frequency Converter Control air intake blower fan makes air intake air quantity and air draft air quantity remain balance.
Described ultrasonic sensor was distributed on film bubble cooling line one week of top, and the numerical value that controller records ultrasonic sensor calculates vesicle diameter by averaging.
The described detection signal that enters the ultrasonic sensor of analog quantity channel carries out preliminary treatment by software programming to it, the filtering error signal.
Described amplifier is proportional integral (PI) adjuster, and is to be realized by software programming fully.
Described ultrasonic sensor is the ultrasonic sensor of accuracy of detection height and strong anti-interference performance.
Described operating desk is a touch-screen, and the transfer of data between controller, frequency converter and the touch-screen adopts the communication transmission.
System of the present invention is made up of air intake blower fan, air draft blower fan, frequency converter, ultrasonic sensor, controller (for example PLC), touch-screen on hardware, carries out work such as signal processing and proportional integral computing by software programming.The present invention adopts two frequency conversion structures, and air intake blower fan and air draft blower fan all adopt variable-frequency motor, are directly controlled by frequency converter, and there is not operating dead zone in butterfly valve structure different from the past.The ultrasonic sensor quantity of accuracy of detection height and good in anti-interference performance changes into a plurality of by original one, thereby the detection signal error that measuring-signal as vesicle diameter produces a certain sensor moment of averaging is divided equally downsizing, make film steep the error that whole displacement causes simultaneously and be cancelled.Software control part is carried out preliminary treatment to the detection signal that each enters the ultrasonic sensor of analog quantity channel, makes the detected error signal of sensor by thoroughly filtering.The function of amplifier is realized by software programming fully, replace control and amplify plate (hardware), and usually ratio (P) adjusters that adopt are improved to proportional integral (PI) adjuster more, select best P, I value, the adjusting situation is even more ideal, when the diameter sudden change that causes film because of reasons such as operations, can return to stable state quickly.The whole signals of system carry out digitized processing by controller, can get rid of interference after the digitized processing, guarantee operational precision, improve control accuracy.And, just in case control system goes wrong, only need connect computer, just can determine the reason of the problem that takes place, maintenance and maintenance are quite convenient.Transfer of data between touch-screen, controller, the frequency converter is finished by communication, transfer of data is reliable, save wiring, reduce the fault point, the control of the setting value of goods fabric width, actual value, air intake and air draft blower fan and service data, P value, I value or the like all can be provided with on touch-screen and show, and be convenient in operation.
Control system operation of the present invention and use are simple, easy to maintenance, stable and reliable operation, and its maximum characteristics are controlled the scheme advanced person exactly, control algolithm uniqueness, control accuracy height.Through testing heavily packing on the blown film unit, the trueness error that has finally reached the goods fabric widths with interior this international most advanced level, for the user has saved a large amount of raw material, greatly reduces production cost at ± 3mm (fabric width is 550mm).The present invention mainly is applicable to and heavily packs on the blown film unit, also can be widely used on the very high plastic membrane blowing unit of goods fabric width required precision.
Four, description of drawings:
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a control principle block diagram of the present invention.
Five, the specific embodiment
High-precision inner-cooling automatic control system as shown in Figure 1, form by frequency conversion air intake blower fan 1, frequency conversion air draft blower fan 2, frequency converter 3, ultrasonic sensor 4, controller 5 (for example PLC), touch-screen 6 on the hardware, the control of the setting value of goods fabric width, actual value, air intake and air draft blower fan and service data, P value, I value or the like all can be provided with on touch-screen and show, and be convenient in operation.
Control principle as shown in Figure 2 during work, material is through extruder 15, head 7 processing are extruded the back and are formed film bubble 12, flat through collapser 13 folders, involve by last carry-over pinch rolls 14, wind inlet channel 8 and wind output channel 9 are arranged in the head 7, there are air inlet 10 and air outlet 11 in film mouth place, the set-point that the air draft rotation speed of fan is fixed according to production technology given, above film bubble cooling line, settle the ultrasonic sensor 4 of three to six German PEPPERL FUCHSs a week, gather the distance signal of ultrasonic sensor by measuring to the film bubble, transmit signals to controller 5 (for example PLC), each feedback signal that enters the ultrasonic sensor of analog quantity channel is carried out preliminary treatment, make the detected error signal of sensor by thoroughly filtering, via controller calculates membrane bubble fabric width actual value again, film is steeped the fabric width actual value and the fabric width set-point compares, its difference is carried out the PID computing through (PI) adjuster, select best P, the I value, communication outputs control signals to the air intake blower fan frequency converter, the rotating speed of Frequency Converter Control air intake blower fan, make air intake air quantity and air draft air quantity remain balance, make film bubble 12 be in highly stable state all the time.The whole signals of system carry out digitized processing by controller, can get rid of interference after the digitized processing, guarantee operational precision, improve control accuracy.
Usability of program fragments is given an example:
Interior cold usability of program fragments (C language):
#include?<bur/plctypes.h>
#include?<bur/plc.h>
#include?″mylib_typ.h″
#include?″global_typ.h″
typedef?struct
{
int?test_enable；
}test_typ；
/ * variable-definition */
_GLOBAL?INT AI774_1_01，AI774_1_02，AI774_1_03，AI774_1_04；
_GLOBAL?INT AO352_01，AO352_2；
_GLOBAL?UINT UltrSet[20]，UltrGet[10]；
_GLOBAL?INT x0，x1，y0，y1，maxnumber，calDia_tempt，dia_ctr；
_GLOBAL?INT diameter_set；
_GLOBAL?INT diameter_act，diameter_act1；
_GLOBAL?motor_typ Motor；
_GLOBAL?unsigned?short UltraEna；
_GLOBAL?Max_SampleJudge_typ maxsample；
_GLOBAL?INT Com_Dia；
_LOCAL thresholddat_typ threshold[4]；
_LOCAL INT filterstep1[4]，filterstep2[4]，filterstep3[4]；
_LOCAL avedat_typ avedat[4]；
_LOCAL INT kp，ki，kd；
………………
/ * concrete function realization */
_INIT?void?init()
{
for(i1＝0；i1＜4；i1++)
{
threshold[i1].threshold＝2000；
threshold[i1].type＝0；
threshold[i1].continue_exceedmax＝6；
avedat[i1].enable＝1；
avedat[i1].number＝20；
avedat[i1].removeNumber＝0；
periodctr[i1].period_number＝1；
}
UltrSet[1] ＝50；
UltrSet[2] ＝400；
UltrSet[3] ＝50；
UltrSet[4] ＝400；
UltrSet[5] ＝50；
UltrSet[6] ＝400；
UltrSet[7] ＝50；
UltrSet[8] ＝400；
……………….
_CYCLIC?void?cyclic(void)
{
for(i1＝0；i1＜4；i1++)
{
threshold[i1].continue_exceedmax＝UltrSet[13]；
avedat[i1].number＝UltrSet[14]；
}
threshold[0].input＝AI774_1_01；
threshold[1].input＝AI774_1_02；
threshold[2].input＝AI774_1_03；
threshold[3].input＝AI774_1_04；
for(i1＝0；i1＜4；i1++)
{
thresholdfilter(&threshold[i1])；
filterstep1[i1]＝threshold[i1].inputarray[0]；
}
avedat[0].current＝filterstep1[0]；
avedat[1].current＝filterstep1[1]；
avedat[2].current＝filterstep1[2]；
avedat[3].current＝filterstep1[3]；
for(i1＝0；i1＜4；i1++)
{
avedatfilter(&avedat[i1])；
filterstep3[i1]＝avedat[i1].out；
}
……………….
The present invention is through testing heavily packing on the blown film unit, obtain and make us well-content effect, the trueness error that has finally reached the goods fabric widths with interior this international most advanced level, for the user has saved a large amount of raw material, greatly reduces production cost at ± 3mm (fabric width is 550mm).
Claims (6)
1, high-precision inner-cooling automatic control system, material is through extruder, head processing is extruded the back and is formed the film bubble, flat through the herringbone plate holder, involve by last carry-over pinch rolls, there are wind inlet channel and wind output channel to be communicated with air intake blower fan and air draft blower fan respectively in the head, there are air inlet and air outlet in film mouth place, it is characterized in that: air intake blower fan and air draft blower fan are the frequency conversion type blower fan, the set-point that the air draft rotation speed of fan is fixed according to production technology given, above film bubble cooling line, a week settle three to six ultrasonic sensors, gather the distance signal of ultrasonic sensor by measuring to the film bubble, transmit signals to controller, via controller calculates membrane bubble fabric width actual value, film is steeped the fabric width actual value and the fabric width set-point compares, its difference is carried out the PID computing through amplifier, outputs control signals to the air intake blower fan frequency converter, the rotating speed of Frequency Converter Control air intake blower fan makes air intake air quantity and air draft air quantity remain balance.
2, high-precision inner-cooling automatic control system according to claim 1 is characterized in that: ultrasonic sensor was distributed on film bubble cooling line one week of top, and the numerical value that controller records ultrasonic sensor calculates vesicle diameter by averaging.
3, high-precision inner-cooling automatic control system according to claim 1 is characterized in that: enter the detection signal of the ultrasonic sensor of analog quantity channel, by software programming it is carried out preliminary treatment, the filtering error signal.
4, high-precision inner-cooling automatic control system according to claim 1 is characterized in that: amplifier is proportional integral (PI) adjuster, and is to be realized by software programming fully.
5, high-precision inner-cooling automatic control system according to claim 1 is characterized in that: ultrasonic sensor is the ultrasonic sensor of accuracy of detection height and strong anti-interference performance.
6, high-precision inner-cooling automatic control system according to claim 1 is characterized in that: the transfer of data between touch-screen, controller, the frequency converter adopts the communication modes transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810012737XA CN101337429A (en) | 2008-08-06 | 2008-08-06 | High-precision inner-cooling automatic control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810012737XA CN101337429A (en) | 2008-08-06 | 2008-08-06 | High-precision inner-cooling automatic control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101337429A true CN101337429A (en) | 2009-01-07 |
Family
ID=40211662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200810012737XA Pending CN101337429A (en) | 2008-08-06 | 2008-08-06 | High-precision inner-cooling automatic control system |
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| Country | Link |
|---|---|
| CN (1) | CN101337429A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101887265A (en) * | 2010-07-16 | 2010-11-17 | 山东科技大学 | Internal cooling control system and method for plastic film production |
| CN105522718A (en) * | 2016-01-15 | 2016-04-27 | 无锡市太平洋新材料股份有限公司 | Film bubble diameter control system |
| CN109605719A (en) * | 2017-12-27 | 2019-04-12 | 广东金明精机股份有限公司 | Rotation traction traction blown film production technology |
| CN109624282A (en) * | 2018-11-14 | 2019-04-16 | 大连橡胶塑料机械有限公司 | The automatic IBC device of inflation film manufacturing machine |
| CN110116487A (en) * | 2019-05-22 | 2019-08-13 | 安徽康采恩包装材料有限公司 | A kind of novel coextrusion film blowing production line cooling control system |
| CN110193924A (en) * | 2017-07-07 | 2019-09-03 | 沈桂英 | A kind of plastic film film bubble stabilizing equipment |
| CN110281515A (en) * | 2019-06-28 | 2019-09-27 | 重庆瑞霆塑胶有限公司 | Thin-wall tube width control system |
| CN110328832A (en) * | 2019-07-12 | 2019-10-15 | 广东金明精机股份有限公司 | The accurate measuring and controlling equipment of bubble blown condensation mode and accurate investigating method |
| CN113119439A (en) * | 2021-04-08 | 2021-07-16 | 贵州科泰天兴农业科技有限公司 | Precise control system and control method for mulching film diameter |
| CN113942220A (en) * | 2021-10-28 | 2022-01-18 | 福建连众智惠实业有限公司 | Membrane bubble heat exchange control device |
| CN114633462A (en) * | 2022-03-18 | 2022-06-17 | 周锁良 | Automatic film uniformity regulating and controlling device and method for film blowing machine |
-
2008
- 2008-08-06 CN CNA200810012737XA patent/CN101337429A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101887265B (en) * | 2010-07-16 | 2013-04-24 | 山东科技大学 | Internal cooling control system and method for plastic film production |
| CN101887265A (en) * | 2010-07-16 | 2010-11-17 | 山东科技大学 | Internal cooling control system and method for plastic film production |
| CN105522718A (en) * | 2016-01-15 | 2016-04-27 | 无锡市太平洋新材料股份有限公司 | Film bubble diameter control system |
| CN110193924A (en) * | 2017-07-07 | 2019-09-03 | 沈桂英 | A kind of plastic film film bubble stabilizing equipment |
| CN110193924B (en) * | 2017-07-07 | 2021-11-12 | 佛山市通明塑料包装有限公司 | Plastic film bubble stabilizing equipment |
| CN109605719A (en) * | 2017-12-27 | 2019-04-12 | 广东金明精机股份有限公司 | Rotation traction traction blown film production technology |
| CN109624282A (en) * | 2018-11-14 | 2019-04-16 | 大连橡胶塑料机械有限公司 | The automatic IBC device of inflation film manufacturing machine |
| CN110116487A (en) * | 2019-05-22 | 2019-08-13 | 安徽康采恩包装材料有限公司 | A kind of novel coextrusion film blowing production line cooling control system |
| CN110281515A (en) * | 2019-06-28 | 2019-09-27 | 重庆瑞霆塑胶有限公司 | Thin-wall tube width control system |
| CN110281515B (en) * | 2019-06-28 | 2021-05-28 | 重庆瑞霆塑胶有限公司 | Thin-walled tube width control system |
| CN110328832A (en) * | 2019-07-12 | 2019-10-15 | 广东金明精机股份有限公司 | The accurate measuring and controlling equipment of bubble blown condensation mode and accurate investigating method |
| CN110328832B (en) * | 2019-07-12 | 2021-02-19 | 广东金明精机股份有限公司 | Bubble inflation condensation form accurate measurement and control equipment and accurate measurement and control method |
| CN113119439A (en) * | 2021-04-08 | 2021-07-16 | 贵州科泰天兴农业科技有限公司 | Precise control system and control method for mulching film diameter |
| CN113942220A (en) * | 2021-10-28 | 2022-01-18 | 福建连众智惠实业有限公司 | Membrane bubble heat exchange control device |
| CN114633462A (en) * | 2022-03-18 | 2022-06-17 | 周锁良 | Automatic film uniformity regulating and controlling device and method for film blowing machine |
| CN114633462B (en) * | 2022-03-18 | 2023-10-20 | 周锁良 | Automatic film uniformity regulating and controlling device and method for film blowing machine |
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Open date: 20090107 |