CN111416588A - Wind power self-stabilizing system for wind head of film blowing machine - Google Patents
Wind power self-stabilizing system for wind head of film blowing machine Download PDFInfo
- Publication number
- CN111416588A CN111416588A CN202010303751.6A CN202010303751A CN111416588A CN 111416588 A CN111416588 A CN 111416588A CN 202010303751 A CN202010303751 A CN 202010303751A CN 111416588 A CN111416588 A CN 111416588A
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- operational amplifier
- resistor
- wind
- inverting input
- capacitor
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- 238000010096 film blowing Methods 0.000 title claims abstract description 15
- 238000007664 blowing Methods 0.000 claims abstract description 9
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 238000011105 stabilization Methods 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 25
- 238000001514 detection method Methods 0.000 claims description 14
- 230000006641 stabilisation Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 239000002245 particle Substances 0.000 description 5
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920006257 Heat-shrinkable film Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Measuring Volume Flow (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention discloses a film blowing machine wind power self-stabilization system, which comprises a wind head, a fan and a control cabinet, wherein the fan is connected with a wind power input end of the wind head through a wind blowing pipeline, an electric control air valve is arranged on the wind blowing pipeline, a flow sensor is arranged at the wind outlet of the wind head, a controller and a flow signal processing unit are arranged in the control cabinet, the flow signal processing unit comprises a differential amplifying circuit, a filtering regulating circuit and a voltage-stabilizing comparison circuit which are sequentially connected, the input end of the differential amplifying circuit is connected with the flow sensor, the output end of the voltage-stabilizing comparison circuit is connected with the controller, and the controller is used for regulating the opening degree of the electric control air valve. And stable wind power can be provided under the condition that the wind source of the fan is unstable, so that the film blowing quality is greatly improved.
Description
Technical Field
The invention relates to the technical field of film blowing equipment, in particular to a wind power self-stabilizing system for a wind head of a film blowing machine.
Background
The production of heat-shrinkable film is that dried polyethylene particles are fed into equipment, and fed into screw from hopper by means of weight of particles, and the screw can forward-push the plastic particles, and in the course of pushing, the plastic particles are progressively melted due to friction between screw and machine barrel and collision friction between particles, and at the same time, due to heating of external portion of the machine barrel. The molten plastic is filtered by a machine head to remove impurities, and then comes out from a die head die orifice, and is cooled by an air ring, blown up, passed through a herringbone plate and a traction roller, and rolled to roll the finished film into a tube. The existing film blowing machine is provided with a U-shaped frame and a rotating plate in a blowing pipeline, the size of film blowing air flow is adjusted by rotating the rotating plate, but the defects of low precision, inconvenience in adjustment and the like exist in the mechanical adjustment mode, and the film blowing quality is influenced because the wind power can not be automatically adjusted to be stable in the unstable state of a fan wind source.
The present invention provides a new solution to this problem.
Disclosure of Invention
In view of the above situation, in order to overcome the defects of the prior art, the present invention aims to provide a wind power self-stabilizing system for a wind head of a film blowing machine.
The technical scheme for solving the problem is as follows: the utility model provides a inflation film manufacturing machine wind-force is from stable system, includes wind head, fan and switch board, the fan passes through the blowing pipe connection the wind-force input of wind head, set up automatically controlled pneumatic valve on the blowing pipeline, wind head air outlet department sets up flow sensor, set up controller and flow signal processing unit in the switch board, flow signal processing unit is including the difference amplifier circuit, filtering regulating circuit and the steady voltage comparison circuit that connect gradually, the input of difference amplifier circuit is connected flow sensor, the output of steady voltage comparison circuit is connected the controller, the controller is used for adjusting the aperture of automatically controlled pneumatic valve.
Further, the differential amplifier circuit comprises an operational amplifier AR1, a non-inverting input terminal of the operational amplifier AR1 is connected to one end of a resistor R2 and one end of a capacitor C2, the other end of the resistor R2 is connected to one end of a capacitor C1 and is connected to a positive output terminal of the flow sensor through a resistor R1, and the other end of the capacitor C1 and the other end of the capacitor C2 and an inverting input terminal of the operational amplifier AR1 are connected to the negative output terminal of the flow sensor in parallel.
Further, the filter adjusting circuit includes an operational amplifier AR2, an inverting input terminal of the operational amplifier AR2 is connected to one end of the resistor R5 and one end of the capacitor C3, a non-inverting input terminal of the operational amplifier AR2 is grounded, an output terminal of the operational amplifier AR2 is connected to one end of the resistor R6, the other end of the resistor R5 is connected to the other end of the resistor R6 and one ends of the resistors R7, R8 and C4, the other ends of the capacitors C3 and C4 are connected to one ends of the resistors R3, R4 and R4, the other end of the resistor R4 is connected to the output terminal of the operational amplifier AR4, the other end of the resistor R4 is grounded, the other end of the resistor R4 is connected to the non-inverting input terminal of the operational amplifier AR4, the inverting input terminal of the operational amplifier AR4 is connected to the output terminal of the operational amplifier AR4 and the other end of the resistor R36.
Further, the voltage stabilizing comparison circuit comprises an operational amplifier AR4, wherein the non-inverting input terminal of the operational amplifier AR4 is connected to the other end of the resistor R4, the inverting input terminal and the output terminal of the operational amplifier AR4 are connected to the inverting input terminal of the operational amplifier AR5, the non-inverting input terminal of the operational amplifier AR5 is connected to the pin 3 of the rheostat RP1, the pin 1 of the rheostat RP1 is connected to a +5V power supply through the resistor R11, the pin 2 of the rheostat RP1 is grounded, and the output terminal of the operational amplifier AR5 is connected to the flow detection end of the controller.
Through the technical scheme, the invention has the beneficial effects that:
1. according to the invention, the flow sensor is arranged at the air outlet of the air head to detect the air flow of the air outlet, and the flow signal processing unit is designed to process the detection signal, so that the flow detection precision is effectively improved, the control precision of the controller on the electric control air valve is improved, and the stability of the wind power of the fan is ensured;
2. the invention has high automation degree and high adjusting precision, can provide stable wind power under the condition of unstable wind source of the fan, and greatly improves the film blowing quality.
Drawings
Fig. 1 is a schematic diagram of a differential amplifier circuit of the present invention.
Fig. 2 is a schematic diagram of the regulation stabilization circuit of the present invention.
Fig. 3 is a schematic diagram of a voltage stabilization comparison circuit of the present invention.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 1 to 3. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
The utility model provides a inflation film manufacturing machine wind-force self stabilization system, includes wind head, fan and switch board, and the fan passes through the wind-force input end of blowing pipeline connection wind head, sets up automatically controlled pneumatic valve on the blowing pipeline, and wind head air outlet department sets up flow sensor P1. The flow signal processing unit of the controller is arranged in the control cabinet and comprises a differential amplification circuit, a filtering regulation circuit and a voltage stabilization comparison circuit which are sequentially connected, the input end of the differential amplification circuit is connected with the flow sensor P1, the output end of the voltage stabilization comparison circuit is connected with the controller, and the controller is used for adjusting the opening degree of the electric control air valve.
The flow sensor P1 is used for detecting the air flow at the air outlet of the tuyere and converting the air flow into an electric signal to be sent to the flow signal processing unit for processing. As shown in fig. 1, the differential amplifier circuit includes an operational amplifier AR1, a non-inverting input terminal of the operational amplifier AR1 is connected to one end of a resistor R2 and one end of a capacitor C2, the other end of the resistor R2 is connected to one end of a capacitor C1, and is connected to an anode output terminal of a flow sensor P1 through a resistor R1, and the other ends of the capacitor C1 and the capacitor C2, an inverting input terminal of the operational amplifier AR1 and a cathode output terminal of the flow sensor P1 are grounded in parallel.
The resistor R2, the capacitor C1 and the capacitor C2 form a pi-type RC filter to perform low-pass filtering on a detection signal of the flow sensor P1, high-frequency interference of external wind disturbance on the flow detection signal is avoided, and then the detection signal is sent to the operational amplifier AR1 to be subjected to differential amplification, so that common-mode interference generated by an output signal of the flow sensor P1 is effectively inhibited, and signal amplification noise is reduced.
The detection signal amplified by the operational amplifier AR1 is sent to a filter adjusting circuit for processing, as shown in fig. 2, the filter adjusting circuit includes an operational amplifier AR2, an inverting input terminal of the operational amplifier AR2 is connected with one end of a resistor R5 and one end of a capacitor C3, a non-inverting input terminal of the operational amplifier AR2 is grounded, an output terminal of the operational amplifier AR2 is connected with one end of a resistor R6, the other end of a resistor R5 is connected with the other end of a resistor R7, R8 and one end of a capacitor C4, the other ends of the capacitors C4 and C4 are connected with one ends of a resistor R4, an output terminal of the operational amplifier AR4 is connected with the other end of the resistor R4, the other end of the resistor R4 is grounded, the other end of the resistor R4 is connected with the non-inverting input terminal of the operational amplifier AR4, and the inverting input terminal of the operational amplifier AR4 is connected with the other end of the resistor R4 through the capacitor C4.
The operational amplifier AR2 and the second-stage RC filter network at the inverting input end form a band-pass filter, the output signal of the operational amplifier AR1 is subjected to frequency-selecting filtering by using the principle of the band-pass filter, and the center frequency of the band-pass filter is consistent with the frequency of the output signal of the flow sensor P1, so that the interference frequency of the internal and external noise interference on the gas flow detection is effectively eliminated. The output signal of fortune ware AR2 is sent into fortune and is put feedback in the ware AR3 of fortune after the resistance reposition of redundant personnel to effectively promote band-pass filtering effect, improve the airflow and detect the precision.
The detection signal after the band-pass filtering is sent into a voltage-stabilizing comparison circuit after further RC filtering, as shown in fig. 3, the voltage-stabilizing comparison circuit includes an operational amplifier AR4, a non-inverting input terminal of the operational amplifier AR4 is connected with the other end of the resistor R4, an inverting input terminal and an output terminal of the operational amplifier AR4 are connected with an inverting input terminal of the operational amplifier AR5, a non-inverting input terminal of the operational amplifier AR5 is connected with a pin 3 of a rheostat RP1, a pin 1 of the rheostat RP1 is connected with a +5V power supply through a resistor R11, a pin 2 of the rheostat RP1 is grounded, and an output terminal of the operational amplifier AR5 is connected with a flow.
The operational amplifier AR4 utilizes the voltage follower principle to isolate and stably output the output signal of the filter regulating circuit, then the output signal is sent into the operational amplifier AR5 to be compared and shaped, a standard 0-5V detection signal required by the controller is obtained, and finally the flow value at the air outlet of the air head is calculated after A/D conversion and waveform analysis in the CPU of the controller.
When the invention is used specifically, the flow sensor P1 detects the air flow at the air outlet of the tuyere in real time, the detection signal is processed by the flow signal processing unit and then sent to the controller for operation, so as to obtain the flow value at the air outlet of the tuyere, the controller compares the flow value with the system preset value and correspondingly adjusts the opening of the electric control air valve according to the comparison result, thereby ensuring that the air flow at the air outlet of the tuyere always meets the system preset requirement, and realizing the purpose of self-stabilization of the wind force of the tuyere.
In summary, the flow sensor is arranged at the air outlet of the air head to detect the air flow of the air outlet, and the flow signal processing unit is designed to process the detection signal, so that the flow detection precision is effectively improved, the control precision of the controller on the electric control air valve is improved, and the stability of the wind power of the fan is ensured. The invention has high automation degree and high adjusting precision, can provide stable wind power under the condition of unstable wind source of the fan, and greatly improves the film blowing quality.
While the invention has been described in further detail with reference to specific embodiments thereof, it is not intended that the invention be limited to the specific embodiments thereof; for those skilled in the art to which the present invention pertains and related technologies, the extension, operation method and data replacement should fall within the protection scope of the present invention based on the technical solution of the present invention.
Claims (4)
1. The utility model provides a inflation film manufacturing machine wind-force self stabilization system, includes wind head, fan and switch board, its characterized in that: the fan is connected with the wind power input end of the wind head through a blowing pipeline, an electric control air valve is arranged on the blowing pipeline, a flow sensor is arranged at the air outlet of the wind head, a controller and a flow signal processing unit are arranged in the control cabinet, the flow signal processing unit comprises a differential amplifying circuit, a filtering adjusting circuit and a voltage stabilizing comparison circuit which are sequentially connected, the input end of the differential amplifying circuit is connected with the flow sensor, the output end of the voltage stabilizing comparison circuit is connected with the controller, and the controller is used for adjusting the opening degree of the electric control air valve.
2. The wind power self-stabilizing system of the film blowing machine wind head according to claim 1, characterized in that: the differential amplifying circuit comprises an operational amplifier AR1, wherein the non-inverting input end of the operational amplifier AR1 is connected with one end of a resistor R2 and one end of a capacitor C2, the other end of the resistor R2 is connected with one end of a capacitor C1 and is connected with the positive output end of the flow sensor through a resistor R1, and the other ends of the capacitor C1 and the capacitor C2 and the inverting input end of the operational amplifier AR1 are grounded in parallel with the negative output end of the flow sensor.
3. The wind power self-stabilizing system of the film blowing machine wind head according to claim 1, characterized in that: the filter adjusting circuit comprises an operational amplifier AR2, an inverting input end of an operational amplifier AR2 is connected with one end of a resistor R5 and one end of a capacitor C3, a non-inverting input end of the operational amplifier AR2 is grounded, an output end of the operational amplifier AR2 is connected with one end of a resistor R6, the other end of a resistor R5 is connected with the other end of a resistor R6 and one ends of a resistor R7, a resistor R8 and a capacitor C4, the other ends of a capacitor C3 and a capacitor C4 are connected with one ends of a resistor R3, a resistor R4 and an output end of the operational amplifier AR4, the other end of the resistor R4 is grounded, the other end of the resistor R4 is connected with a non-inverting input end of the operational amplifier AR4, the inverting input end of the operational amplifier AR4 is connected with the output end of the operational amplifier AR4 and the other end of the resistor R4 through the capacitor C36.
4. The wind power self-stabilizing system of the film blowing machine wind head according to claim 1, characterized in that: the voltage stabilizing comparison circuit comprises an operational amplifier AR4, wherein the non-inverting input end of the operational amplifier AR4 is connected with the other end of the resistor R4, the inverting input end and the output end of the operational amplifier AR4 are connected with the inverting input end of the operational amplifier AR5, the non-inverting input end of the operational amplifier AR5 is connected with a pin 3 of a rheostat RP1, a pin 1 of the rheostat RP1 is connected with a +5V power supply through a resistor R11, a pin 2 of the rheostat RP1 is grounded, and the output end of the operational amplifier AR5 is connected with the flow detection end of the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010303751.6A CN111416588B (en) | 2020-04-17 | 2020-04-17 | Wind head and wind power self-stabilizing system of film blowing machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010303751.6A CN111416588B (en) | 2020-04-17 | 2020-04-17 | Wind head and wind power self-stabilizing system of film blowing machine |
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| Publication Number | Publication Date |
|---|---|
| CN111416588A true CN111416588A (en) | 2020-07-14 |
| CN111416588B CN111416588B (en) | 2024-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010303751.6A Active CN111416588B (en) | 2020-04-17 | 2020-04-17 | Wind head and wind power self-stabilizing system of film blowing machine |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5525277A (en) * | 1992-04-13 | 1996-06-11 | Joseph; Daniel R. | Method and apparatus for cooling extruded film tubes |
| JP2008155568A (en) * | 2006-12-26 | 2008-07-10 | Placo Co Ltd | Foam blow molding method and foam blow molding machine for executing it |
| CN201645813U (en) * | 2009-12-31 | 2010-11-24 | 广州市国研机械设备制造有限公司 | Ultrasonic testing automatic air-compensating device for film blowing machine |
| CN202517717U (en) * | 2012-05-10 | 2012-11-07 | 广州市金威龙实业股份有限公司 | Automatic control cooling device of molded film of film blowing machine |
| CN204392204U (en) * | 2015-02-06 | 2015-06-10 | 国家电网公司 | A kind of ultra-weak electronic signal low-power consumption filter circuit |
| CN205546068U (en) * | 2016-03-01 | 2016-08-31 | 厦门羽星科技股份有限公司 | Three -dimensional LED show equipment of modified |
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| CN209746382U (en) * | 2019-03-11 | 2019-12-06 | 河南世贤纺织科技有限公司 | Energy-saving circuit of setting machine |
-
2020
- 2020-04-17 CN CN202010303751.6A patent/CN111416588B/en active Active
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|---|---|---|---|---|
| US5525277A (en) * | 1992-04-13 | 1996-06-11 | Joseph; Daniel R. | Method and apparatus for cooling extruded film tubes |
| JP2008155568A (en) * | 2006-12-26 | 2008-07-10 | Placo Co Ltd | Foam blow molding method and foam blow molding machine for executing it |
| CN201645813U (en) * | 2009-12-31 | 2010-11-24 | 广州市国研机械设备制造有限公司 | Ultrasonic testing automatic air-compensating device for film blowing machine |
| CN202517717U (en) * | 2012-05-10 | 2012-11-07 | 广州市金威龙实业股份有限公司 | Automatic control cooling device of molded film of film blowing machine |
| CN204392204U (en) * | 2015-02-06 | 2015-06-10 | 国家电网公司 | A kind of ultra-weak electronic signal low-power consumption filter circuit |
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| CN207688915U (en) * | 2018-01-05 | 2018-08-03 | 哈尔滨理工大学 | A kind of Machine Vision Inspecting System |
| CN209746382U (en) * | 2019-03-11 | 2019-12-06 | 河南世贤纺织科技有限公司 | Energy-saving circuit of setting machine |
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| CN111416588B (en) | 2024-01-30 |
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