CN113942220A - Membrane bubble heat exchange control device - Google Patents
Membrane bubble heat exchange control device Download PDFInfo
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- CN113942220A CN113942220A CN202111259471.0A CN202111259471A CN113942220A CN 113942220 A CN113942220 A CN 113942220A CN 202111259471 A CN202111259471 A CN 202111259471A CN 113942220 A CN113942220 A CN 113942220A
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- air
- film bubble
- air inlet
- bubble
- electrically connected
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- 239000012528 membrane Substances 0.000 title claims description 6
- 238000001125 extrusion Methods 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 4
- 239000000523 sample Substances 0.000 claims description 19
- 238000007664 blowing Methods 0.000 description 9
- 239000013589 supplement Substances 0.000 description 6
- 238000010096 film blowing Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/78—Measuring, controlling or regulating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention discloses a film bubble heat exchange control device, which comprises an extrusion die head, an air inlet fan, a cooling air ring, a film bubble diameter detection device and a control processing device, wherein the cooling air ring is arranged on the extrusion die head, and the air inlet fan is communicated with an air inlet of the cooling air ring; the film bubble diameter detection device is arranged on the outer side of the film bubble blown out of the extrusion die head; the film bubble diameter detection device is electrically connected with the control processing device, and the signal input end of the air inlet fan is electrically connected with the corresponding signal output end of the control processing device; the method is characterized in that: the heat exchanger is cylindrical, the heat exchanger is arranged on the cooling air ring, and the exhaust fan is communicated with a middle cavity of the heat exchanger; the exhaust fan is electrically connected with the control processing device. The film bubble heat exchange control device can detect the diameter of a film bubble, timely change the diameter of the film bubble according to needs, and enable the film walls at all positions of the film bubble to keep consistent diameter and uniform thickness when the diameter of the film bubble is changed.
Description
Technical Field
The invention relates to film production equipment, in particular to a film bubble heat exchange control device.
Background
In the production process of the film blowing machine, the more uniform the diameter of the bubble blown by the film blowing machine (the diameter of the bubble after the bubble is blown and condensed), the more uniform the thickness of the plastic film, so that the bubble diameter must be constantly measured and controlled in the production process in order to improve the quality of the plastic film. Patent document with publication number CN207747400U discloses a full-automatic air supplement system of a film blowing machine, which comprises a die head, an air source and an air supplement device, wherein the die head is provided with an air inlet pipe and an air outlet pipe, and is characterized in that: the air supplementing device comprises an ultrasonic probe, a control circuit and an electromagnetic valve, wherein the ultrasonic probe is arranged on the outer side of the film bubble blown out of the die head, the signal output end of the ultrasonic probe is connected with the signal input end of the control circuit, the signal output end of the control circuit is connected with the electromagnetic valve, the air inlet end of the electromagnetic valve is connected with the air source, and the air outlet end of the electromagnetic valve is connected with the air inlet pipe. The full-automatic air supplement system of the film blowing machine detects the distance between the surface of a film bubble and a probe through an ultrasonic probe, changes of effective distance are converted into electric signals, in the film blowing process, due to the exhaust of an air outlet pipe, the air pressure in the film bubble is gradually reduced, the diameter of the film bubble is gradually reduced, when the distance between the surface of the film bubble and the ultrasonic probe exceeds a preset maximum value, the ultrasonic probe outputs electric signals to be connected with a control circuit, a solenoid valve is opened to be connected with an air source and an air inlet pipe, so that the air passes through the air inlet pipe and reaches a die head to supplement air; in the air supplement process, the air pressure in the film bubble is gradually increased, the diameter of the film bubble is increased, the distance between the surface of the film bubble and the ultrasonic probe is gradually reduced, when the distance between the surface of the film bubble and the ultrasonic probe is smaller than a preset minimum value, the ultrasonic probe outputs an electric signal to disconnect the control circuit, the electromagnetic valve is closed to stop air supplement, and the cycle is carried out.
According to the technical scheme, the mode that the air outlet pipe is communicated with the outside to exhaust air is adopted, so that when the air pressure in the bubble is too high and needs to be reduced in time, the exhaust speed is too low, and the diameter of the bubble cannot be adjusted in time; simultaneously, the internal gas pressure of the film bubble is lower, when the gas pressure needs to be increased, the gas blown into the film bubble rapidly through the gas source can rapidly reduce the heat of the film bubble, and the upper film wall of the film bubble is easily cooled and solidified when the condensation line is not reached, so that the upper diameter and the lower diameter of the whole film bubble are inconsistent, the wall thickness is not uniform, and the quality of the whole film is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a film bubble heat exchange control device, which can detect the diameter of a film bubble, change the diameter of the film bubble in time according to needs, and keep the film walls at various positions of the film bubble in consistent diameter and uniform thickness when the diameter of the film bubble is changed.
In order to solve the technical problems, the technical scheme is as follows:
a film bubble heat exchange control device comprises an extrusion die head, an air inlet fan, a cooling air ring, a film bubble diameter detection device and a control processing device, wherein an air inlet pipe and an air outlet pipe are arranged in the extrusion die head; the film bubble diameter detection device is arranged on the outer side of the film bubble blown out of the extrusion die head; the signal output end of the bubble diameter detection device is electrically connected with the signal input end of the control processing device, and the signal input end of the air inlet fan is electrically connected with the corresponding signal output end of the control processing device; the method is characterized in that: the heat exchanger is cylindrical, the heat exchanger is arranged on the cooling air ring, a middle cavity of the heat exchanger is communicated with an air outlet pipe of the extrusion die head, and an air exhaust opening of the exhaust fan is communicated with the air outlet pipe; and the signal input end of the exhaust fan is electrically connected with the signal output end corresponding to the control processing device.
In the bubble heat exchange control device, the control processing device is provided with a preset range value of the bubble diameter. When air is fed, compressed air is conveyed to the air inlet of the cooling air ring through the air inlet pipe by the air inlet fan, and the compressed air is blown upwards from the air outlets on the periphery of the cooling air ring along the gap between the outer wall of the heat exchanger and the film bubble; meanwhile, the air in the film bubble is pumped out by the exhaust fan, the air is collected from top to bottom by the middle cavity of the cylindrical heat exchanger when being pumped out and is exhausted by the air outlet pipe, but the air inlet speed is kept to be higher than the exhaust speed, so that the air pressure in the film bubble keeps stably increasing, and the diameter of the film bubble is gradually expanded; then the diameter of the film bubble is detected by a film bubble diameter detection device, the diameter data of the film bubble is sent to a control processing device, the diameter data is compared with a preset range value by the control processing device, and the blowing speed of an air inlet fan and the air extraction speed of an air exhaust fan are adjusted according to the comparison result; when the diameter data of the film bubble is smaller than the minimum value of the preset range value, the control processing device controls the air inlet fan to accelerate the blowing speed, and controls the air exhaust fan to slow down the air exhaust speed, so that the air pressure in the film bubble is increased, and the film bubble can be continuously blown large until the diameter data of the film bubble is matched with the preset range value; when the diameter data of the film bubble is larger than the maximum value of the preset range value, the control processing device controls the air inlet fan to slow down the blowing speed, and controls the air exhaust fan to accelerate the air exhaust speed, so that the air pressure in the film bubble is reduced, and the diameter of the film bubble is gradually reduced until the diameter data of the film bubble is matched with the preset range value. The film bubble heat exchange control device can complete internal air pressure adjustment as soon as possible by arranging the exhaust fan, so that the film bubble can complete diameter adjustment in time; meanwhile, when the air pressure in the film bubble needs to be increased, so that the blowing speed of the air inlet fan is increased, and the air exhaust speed of the air exhaust fan is reduced, because the air is blown in from the peripheral edge of the cooling air ring, the air can be directly contacted with the edge of the film bubble when entering, in order to avoid the phenomenon of shock cooling of the air temperature in the film bubble caused by blowing in of a large amount of air, the heat exchanger is arranged to exchange the heat in the pumped air into the blown air, so that the air temperature in the film bubble is kept stable, and the film bubble can not be cooled and solidified on the upper film wall of the film bubble due to rapid temperature reduction; because the hot gas of discharge is discharged by cylindric heat exchanger's middle part cavity, the hot gas of discharge and the air conditioning of entering can be separated by heat exchanger's lateral wall, can not direct contact, can effectively avoid cold wind and hot-blast direct contact to cause the intramembranous air pressure to descend to diameter inconsistency, the inhomogeneous condition of wall thickness about avoiding whole membrane bubble to appear improve the quality of film.
In a preferable scheme, the bubble diameter detection device comprises at least two probes, the probes are arranged on the outer side of the bubble blown out of the extrusion die head along the circumferential direction of the extrusion die head, and the signal output end of each probe is electrically connected with the signal input end of the control processing device. The diameter of the film bubble can be jointly detected by each probe along the circumferential direction of the extrusion die head, so that the obtained diameter data of the film bubble is more accurate.
In a further preferred scheme, each probe adopts an ultrasonic sensor, and a signal output end of the ultrasonic sensor is electrically connected with a signal input end of the control processing device. The ultrasonic sensor can adopt German SICK UM30-213113 ultrasonic sensor.
In a preferred scheme, the control processing device comprises an operation display screen, a microcomputer controller, an air inlet frequency converter and an air exhaust frequency converter, wherein the signal output ends of the operation display screen and the bubble diameter detection device are respectively and electrically connected with the signal input end corresponding to the microcomputer controller, and the signal input ends of the operation display screen, the air inlet frequency converter and the air exhaust frequency converter are respectively and electrically connected with the signal output end corresponding to the microcomputer controller; the signal output end of the air inlet frequency converter is electrically connected with the signal input end of the air inlet fan, and the signal output end of the air exhaust frequency converter is electrically connected with the signal input end of the air exhaust fan. An operator can set data such as the width of the film, the thickness of the film, the preset range value of the diameter of the bubble, the extrusion speed and the like on an operation display screen and can display actual data during extrusion; the microcomputer controller receives the diameter data detected by the bubble diameter detection device and compares the diameter data with a preset range value, and controls the rotating speeds of the air inlet fan and the air exhaust fan through the air inlet frequency converter and the air exhaust frequency converter respectively according to a comparison result. The operation display screen can adopt a pedology MT4512TE display screen; the microcomputer controller can adopt a Siemens S7-1200 programmable controller; both the air inlet frequency converter and the air outlet frequency converter can adopt a Taida C2000 frequency converter.
The invention has the beneficial effects that: the film bubble heat exchange control device can detect the diameter of a film bubble, meanwhile, the diameter of the film bubble is changed in time by changing the air pressure in the film bubble according to needs, and when the air pressure in the film bubble is changed, the temperature of compressed air in the film bubble can be kept stable, the film wall of each position of the film bubble is kept uniform in thickness, and the quality of a film is guaranteed.
Drawings
FIG. 1 is a schematic diagram of a bubble heat exchange control apparatus according to the present invention;
fig. 2 is an enlarged view of the position a in fig. 1.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments:
the film bubble heat exchange control device shown in fig. 1-2 comprises an extrusion die head 1, an air inlet fan 2, a cooling air ring 3, a heat exchanger 4, an exhaust fan 5, a film bubble diameter detection device 6 and a control processing device 7, wherein the extrusion die head 1 is internally provided with an air inlet pipe 101 and an air outlet pipe 102, the cooling air ring 3 is arranged on the extrusion die head 1, an air inlet of the cooling air ring 3 is communicated with the air inlet pipe 101 of the extrusion die head 1, and an air outlet of the air inlet fan 2 is communicated with the air inlet pipe 101; the heat exchanger 4 is cylindrical, the heat exchanger 4 is arranged on the cooling air ring 3, a middle cavity of the heat exchanger 4 is communicated with an air outlet pipe 102 of the extrusion die head 1, and an air suction opening of the exhaust fan 5 is communicated with the air outlet pipe 102; the bubble diameter detection device 6 includes a plurality of ultrasonic sensors 601, and the ultrasonic sensors 601 are arranged on the outer side of the bubble blown out by the extrusion die head 1 along the circumferential direction of the extrusion die head 1; the control processing device 7 comprises an operation display screen 701, a microcomputer controller 702, an air inlet frequency converter 703 and an air outlet frequency converter 704, wherein the signal output ends of the operation display screen 701 and each ultrasonic sensor 601 are respectively and electrically connected with the corresponding signal input end of the microcomputer controller 702, and the signal input ends of the operation display screen 701, the air inlet frequency converter 703 and the air outlet frequency converter 704 are respectively and electrically connected with the corresponding signal output end of the microcomputer controller 702; the signal output end of the air inlet frequency converter 703 is electrically connected with the signal input end of the air inlet fan 2, and the signal output end of the air outlet frequency converter 704 is electrically connected with the signal input end of the air outlet fan 5.
In the bubble heat exchange control device, an operator can set data such as the width of a film, the thickness of the film, the preset range value of the diameter of a bubble, the extrusion speed and the like on an operation display screen 701 and can display actual data during extrusion; the microcomputer controller 702 has a preset range of bubble diameters. When air is fed, the air inlet fan 2 conveys compressed air to the air inlet of the cooling air ring 3 through the air inlet pipe 101, and the compressed air is blown upwards from the air outlets on the periphery of the cooling air ring 3 along the gap between the outer wall of the heat exchanger 4 and the film bubble; meanwhile, the exhaust fan 5 extracts air in the film bubble, the air is collected from top to bottom by the middle cavity of the cylindrical heat exchanger 4 when being extracted, and is exhausted through the air outlet pipe 102, but the air inlet speed is kept to be higher than the exhaust speed, so that the air pressure in the film bubble keeps stably increasing, and the diameter of the film bubble is gradually expanded; then, the ultrasonic sensors 601 can jointly detect the diameter of the film bubble along the circumferential direction of the extrusion die head 1, and send the diameter data of the film bubble to the control processing device 7, the microcomputer controller 702 receives the diameter data detected by the film bubble diameter detection device 6 and compares the diameter data with a preset range value, and the rotation speeds of the air inlet fan 2 and the air exhaust fan 5 are respectively controlled by the air inlet frequency converter 703 and the air exhaust frequency converter 704 according to the comparison result; when the diameter data of the film bubble is smaller than the minimum value of the preset range value, the control processing device 7 controls the air inlet fan 2 to accelerate the blowing speed, and controls the air exhaust fan 5 to slow down the air exhaust speed, so that the air pressure in the film bubble is increased, and the film bubble can be continuously blown large until the diameter data of the film bubble is matched with the preset range value; when the diameter data of the film bubble is larger than the maximum value of the preset range value, the control processing device 7 controls the air inlet fan 2 to slow down the blowing speed, and controls the air exhaust fan 5 to accelerate the air exhaust speed, so that the air pressure in the film bubble is reduced, and the diameter of the film bubble is gradually reduced until the diameter data of the film bubble is matched with the preset range value. The film bubble heat exchange control device can complete internal air pressure adjustment as soon as possible by arranging the exhaust fan 5, so that the film bubble can complete diameter adjustment in time; meanwhile, when the air pressure in the film bubble needs to be increased, so that the blowing speed of the air inlet fan 2 is increased, and the air exhaust speed of the air exhaust fan 5 is reduced, because the air is blown in from the peripheral edge of the cooling air ring 3, the air can be directly contacted with the edge of the film bubble when entering, in order to avoid the phenomenon of shock cooling of the air temperature in the film bubble caused by blowing in of a large amount of air, the heat exchanger 4 is arranged to exchange the heat in the pumped air into the blown air, so that the air temperature in the film bubble is kept stable, and the film bubble can not be cooled and solidified on the upper film wall of the film bubble due to rapid temperature reduction; simultaneously, because the hot-blast middle part cavity that discharges by cylindric heat exchanger 4 is discharged, the hot-blast air conditioning that discharges and get into can be separated by heat exchanger 4's lateral wall, can not direct contact, can effectively avoid cold wind and hot-blast direct contact to cause the intramembranous air pressure to descend to diameter is inconsistent, the inhomogeneous condition of wall thickness about avoiding whole bubble to appear, improves the quality of film.
The ultrasonic sensor 601 adopts a German SICK UM30-213113 ultrasonic sensor 601; the operation display screen 701 adopts a pedology MT4512TE display screen; the microcomputer controller 702 is a Siemens S7-1200 programmable controller; the air inlet frequency converter 703 and the air outlet frequency converter 704 both adopt a Taida C2000 frequency converter.
Claims (4)
1. A film bubble heat exchange control device comprises an extrusion die head, an air inlet fan, a cooling air ring, a film bubble diameter detection device and a control processing device, wherein an air inlet pipe and an air outlet pipe are arranged in the extrusion die head; the film bubble diameter detection device is arranged on the outer side of the film bubble blown out of the extrusion die head; the signal output end of the bubble diameter detection device is electrically connected with the signal input end of the control processing device, and the signal input end of the air inlet fan is electrically connected with the corresponding signal output end of the control processing device; the method is characterized in that: the heat exchanger is cylindrical, the heat exchanger is arranged on the cooling air ring, a middle cavity of the heat exchanger is communicated with an air outlet pipe of the extrusion die head, and an air exhaust opening of the exhaust fan is communicated with the air outlet pipe; and the signal input end of the exhaust fan is electrically connected with the signal output end corresponding to the control processing device.
2. A membrane bubble heat exchange control apparatus as claimed in claim 1, wherein: the bubble diameter detection device comprises at least two probes, the probes are arranged on the outer side of the bubble blown out of the extrusion die head along the circumferential direction of the extrusion die head, and the signal output end of each probe is electrically connected with the signal input end of the control processing device.
3. A membrane bubble heat exchange control apparatus as claimed in claim 2, wherein: each probe adopts an ultrasonic sensor, and the signal output end of the ultrasonic sensor is electrically connected with the signal input end of the control processing device.
4. A membrane bubble heat exchange control apparatus as claimed in claim 1, wherein: the control processing device comprises an operation display screen, a microcomputer controller, an air inlet frequency converter and an air outlet frequency converter, wherein the signal output ends of the operation display screen and the bubble diameter detection device are respectively and electrically connected with the signal input end corresponding to the microcomputer controller, and the signal input ends of the operation display screen, the air inlet frequency converter and the air outlet frequency converter are respectively and electrically connected with the signal output end corresponding to the microcomputer controller; the signal output end of the air inlet frequency converter is electrically connected with the signal input end of the air inlet fan, and the signal output end of the air exhaust frequency converter is electrically connected with the signal input end of the air exhaust fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111259471.0A CN113942220A (en) | 2021-10-28 | 2021-10-28 | Membrane bubble heat exchange control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111259471.0A CN113942220A (en) | 2021-10-28 | 2021-10-28 | Membrane bubble heat exchange control device |
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| Publication Number | Publication Date |
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| CN113942220A true CN113942220A (en) | 2022-01-18 |
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| CN202111259471.0A Pending CN113942220A (en) | 2021-10-28 | 2021-10-28 | Membrane bubble heat exchange control device |
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| CN2582854Y (en) * | 2002-12-12 | 2003-10-29 | 马之清 | Polyethylene film blow moulding machine convection cooling device |
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| CN209888138U (en) * | 2019-03-28 | 2020-01-03 | 广东金明精机股份有限公司 | Auxiliary cooling mechanism of film blowing equipment |
| CN210911140U (en) * | 2019-10-23 | 2020-07-03 | 宁波鼎峰新材料科技有限公司 | Air pressure adjusting device of film blowing machine |
| CN211730213U (en) * | 2019-12-30 | 2020-10-23 | 武汉昌信塑机有限责任公司 | Internal cooling device of film blowing machine |
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2021
- 2021-10-28 CN CN202111259471.0A patent/CN113942220A/en active Pending
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| CN2582853Y (en) * | 2002-12-12 | 2003-10-29 | 马之清 | Polyethylene film blow moulding machine having forced circulation internal cooling device |
| CN2582854Y (en) * | 2002-12-12 | 2003-10-29 | 马之清 | Polyethylene film blow moulding machine convection cooling device |
| CN101337429A (en) * | 2008-08-06 | 2009-01-07 | 大连橡胶塑料机械股份有限公司 | High-precision inner-cooling automatic control system |
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