CN112226832A - Hot air pressure control method and system for melt blowing machine - Google Patents
Hot air pressure control method and system for melt blowing machine Download PDFInfo
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- CN112226832A CN112226832A CN202011049430.4A CN202011049430A CN112226832A CN 112226832 A CN112226832 A CN 112226832A CN 202011049430 A CN202011049430 A CN 202011049430A CN 112226832 A CN112226832 A CN 112226832A
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- Prior art keywords
- hot air
- air pressure
- rotating speed
- melt
- roots blower
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/098—Melt spinning methods with simultaneous stretching
- D01D5/0985—Melt spinning methods with simultaneous stretching by means of a flowing gas (e.g. melt-blowing)
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D13/00—Complete machines for producing artificial threads
- D01D13/02—Elements of machines in combination
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/56—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention discloses a hot air pressure control method and a system for a melt blowing machine, which comprises the following steps: acquiring a hot air pressure value of a melt-blowing machine in real time; and adjusting the rotating speed of the Roots blower for conveying hot air according to the hot air pressure value and a preset threshold value. Through real-time detection hot air pressure, and through the rotational speed of controller adjustment roots's fan, can make hot air pressure stabilize at predetermineeing the threshold value within range, thereby guarantee the stability of melt-blown machine work, and then improve the production quality of melt-blown cloth, still can improve roots's fan's life in addition.
Description
Technical Field
The invention relates to the technical field of melt-blowing machines, in particular to a hot air pressure control method and a hot air pressure control system for a melt-blowing machine.
Background
In the production process of the melt-blown fabric, high-pressure airflow and hot air cleanness are main factors for ensuring the production quality of the melt-blown fabric. The Roots blower can stably convey the heated high-pressure airflow in the states of accurate flow control, high purity and high pressure, so that the Roots blower plays a vital role in the production process of melt-blown cloth.
However, in the production process of the existing melt-blowing machine, the problem of belt breakage on a motor of a Roots blower caused by overhigh hot air pressure easily occurs, and further the production efficiency of melt-blowing cloth is influenced.
At present, the Roots blower is protected mainly by installing the pressure release valve on the hot air pipeline, but the pressure of hot air is unstable due to the adoption of the mode when the pressure release valve releases the pressure, so that the quality of melt-blown cloth is unstable.
Therefore, how to control the hot air pressure of the melt-blowing machine to be in a stable state so as to ensure the normal operation of the roots blower is a technical problem which needs to be solved urgently by the technical personnel in the field.
Disclosure of Invention
The invention aims to provide a hot air pressure control method and a hot air pressure control system for a melt-blowing machine, which can effectively solve the problems of abnormal work of a Roots blower and the like caused by unstable hot air pressure.
In order to solve the technical problems, the invention provides the following technical scheme:
a hot air pressure control method for a melt blowing machine, comprising:
acquiring a hot air pressure value of a melt-blowing machine in real time;
judging whether the hot air pressure value meets a preset threshold value or not;
if not, adjusting the rotating speed of the Roots blower for conveying hot air until the hot air pressure value meets a preset threshold value.
Preferably, before the obtaining the pressure value of the hot air of the melt-blowing machine in real time, the method further comprises the following steps:
and acquiring the theoretical rotating speed of the Roots blower corresponding to the target hot air pressure according to the set target hot air pressure.
Preferably, the determining whether the hot air pressure value meets a preset threshold specifically includes:
acquiring a difference value between the hot air pressure value and the target hot air pressure;
and judging whether the difference value meets a preset PID range parameter.
Preferably, when the difference value does not meet the preset PID range parameter, PID operation is performed, and meanwhile, a PID operation result is obtained, and at the moment, the output rotating speed of the Roots blower is equal to the sum of the theoretical rotating speed and the PID operation result.
Preferably, when the difference value meets a preset PID range parameter, the PID operation is quitted, and meanwhile, a PID operation result during quitting is obtained, and at the moment, the output rotating speed of the Roots blower is equal to the sum of the theoretical rotating speed and the PID operation result during quitting.
A hot air pressure control system for a meltblowing machine comprising:
the air pressure sensor is used for acquiring the hot air pressure value of the melt-blowing machine in real time;
the controller, the controller with the wind pressure sensor and be used for carrying hot-blast roots's fan to connect, the controller is used for according to predetermineeing the threshold value with hot-blast pressure value adjusts roots's fan's rotational speed.
Preferably, the roots blower further comprises an input module and a data processing module, the input module is connected with the controller and the data processing module, the input module is used for inputting target hot air pressure, and the data processing module is used for acquiring the theoretical rotating speed of the roots blower according to the target hot air pressure.
Preferably, the controller comprises a PID operation module, and the PID operation module is used for acquiring the output rotating speed of the Roots blower according to the hot air pressure value and the theoretical rotating speed of the Roots blower.
Compared with the prior art, the technical scheme has the following advantages:
the invention provides a hot air pressure control method and a system for a melt blowing machine, which comprises the following steps: acquiring a hot air pressure value of a melt-blowing machine in real time; and adjusting the rotating speed of the Roots blower for conveying hot air according to the hot air pressure value and a preset threshold value. Through real-time detection hot air pressure, and through the rotational speed of controller adjustment roots's fan, can make hot air pressure stabilize at predetermineeing the threshold value within range, thereby guarantee the stability of melt-blown machine work, and then improve the production quality of melt-blown cloth, still can improve roots's fan's life in addition.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a hot air pressure control method for a melt blowing machine according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a PID algorithm;
FIG. 3 is a block diagram of a hot air pressure control system for a melt blowing machine according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in a number of ways different from those described herein and similar generalizations can be made by those skilled in the art without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
Referring to fig. 1 and 2, fig. 1 is a flow chart of a hot air pressure control method for a melt blowing machine according to an embodiment of the present invention; FIG. 2 is a schematic diagram of the PID algorithm.
One embodiment of the present invention provides a hot air pressure control method for a melt blowing machine, comprising the steps of:
s100: and acquiring the theoretical rotating speed of the Roots blower corresponding to the target hot air pressure according to the set target hot air pressure. The wind pressure and the rotating speed relational expression of the Roots blower can be obtained specifically, wherein the relational expression of the wind pressure and the rotating speed is as follows:
P1/P2＝(n1/n2)2 equation 1
Wherein P is1、P2Is the wind pressure (unit: Pa); n is1、n2The rotational speed of the fan (unit: r/min).
S200: and controlling the Roots blower to operate at the theoretical rotating speed.
S300: and acquiring the hot air pressure value of the melt-blowing machine in real time. The hot air pressure value of the melt-blowing machine can be detected in real time through the wind pressure sensor.
S400: judging whether the hot air pressure value meets a preset threshold value or not; if not, the next step is carried out:
s500: and adjusting the rotating speed of the Roots blower for conveying hot air until the hot air pressure value meets a preset threshold value.
Through the hot air pressure control method provided by the embodiment, the hot air pressure can be stabilized within the range of the preset threshold value, so that the working stability of the melt-blown machine is ensured, the production quality of melt-blown cloth is improved, and in addition, the problem that a belt is broken due to overlarge hot air pressure of a Roots blower can be prevented, and the service life of the Roots blower is prolonged.
Specifically, the rotating speed of the roots blower can be adjusted in real time through PID operation by the controller, wherein the step of judging whether the hot air pressure value meets the preset threshold specifically comprises the following steps:
acquiring a difference value between a hot air pressure value and a target hot air pressure;
and judging whether the difference value meets a preset PID range parameter.
The basic control rule of the PID algorithm is shown as the following formula:
specifically, at a specific time t, the input quantity is rin (t) and the output quantity is rout (t), and the deviation can be calculated as err (t) rin (t) -rout (t). The basic control law of PID can then be expressed as the following equation:
wherein kp is a proportional band, TIFor integration time, TDT is a time constant, and err (t) is a deviation.
And when the difference value does not meet the preset PID range parameter, performing PID operation, and simultaneously obtaining a PID operation result M through a formula 2, wherein the output rotating speed n2 of the Roots blower is equal to the sum of the theoretical rotating speed n1 and the PID operation result M, and the controller controls the Roots blower to operate at the output rotating speed n 2.
For example: the set pressure was 0.4bar and the actual pressure was 0.3 bar. And the PID range parameter is set to 0.05bar, |0.3-0.4| -0.1 >0.05, and then PID operation is carried out.
And when the difference value meets the preset PID range parameter, exiting the PID operation, and simultaneously obtaining the PID operation result M1 when exiting, wherein the output rotating speed n2 of the Roots blower is equal to the sum of the theoretical rotating speed n1 and the PID operation result M1 when exiting.
Through PID control mode, can realize closed-loop control to hot-blast pressure for roots's fan work is in the relatively stable state of load, thereby guarantees the stability of work.
Referring to fig. 3, fig. 3 is a block diagram of a hot air pressure control system for a melt blowing machine according to an embodiment of the present invention.
The embodiment of the invention provides a hot air pressure control system for a melt blowing machine, which comprises: the controller is connected with the wind pressure sensor and the Roots blower for conveying hot air, wherein the wind pressure sensor is used for acquiring a hot air pressure value of the melt-blowing machine in real time and transmitting the hot air pressure value to the controller through the communication module; the controller is used for adjusting the rotating speed of the Roots blower according to a preset threshold value and a hot air pressure value. Through real-time detection hot air pressure, and through the rotational speed of controller adjustment roots's fan, can make hot air pressure stabilize at predetermineeing the threshold value within range, thereby guarantee the stability of melt-blown machine work, and then improve the production quality of melt-blown cloth, still can improve roots's fan's life in addition.
Wherein can be by converter control motor, the motor drives roots's fan through the belt again and rotates, and roots's fan rotational speed's adjustment, accessible converter are controlled.
The roots blower further comprises an input module and a data processing module, the input module is connected with the controller and the data processing module, the input module is used for inputting target hot air pressure, and the data processing module is used for acquiring the theoretical rotating speed of the roots blower according to the target hot air pressure. Specifically, after the user inputs the target hot air pressure into the system through the input module, the data processing module can obtain the theoretical rotating speed of the roots blower corresponding to the target hot air pressure through calculation, and then the roots blower can be controlled to operate at the theoretical rotating speed. And the display module is used for displaying various parameters input by the user.
The controller comprises a PID operation module, and the PID operation module is used for acquiring the output rotating speed of the Roots blower according to the hot air pressure value and the theoretical rotating speed of the Roots blower. In addition, the device also comprises a storage module for storing parameter set values, and the storage module can store target hot air pressure and parameters required by PID operation.
Specifically, when the difference value of the hot air pressure value and the target hot air pressure value collected in real time is greater than the preset PID range parameter in the PID operation module, the PID operation is carried out, the PID operation result is obtained, the output rotating speed of the Roots blower is equal to the sum of the theoretical rotating speed of the Roots blower and the PID operation result, then the output rotating speed of the Roots blower is sent to the frequency converter, the frequency converter drives the motor according to the output rotating speed at the moment, and the motor drives the Roots blower through the belt, so that the rotating speed of the Roots blower is automatically adjusted.
It should also be noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A hot air pressure control method for a melt blowing machine is characterized by comprising the following steps:
acquiring a hot air pressure value of a melt-blowing machine in real time;
judging whether the hot air pressure value meets a preset threshold value or not;
if not, adjusting the rotating speed of the Roots blower for conveying hot air until the hot air pressure value meets a preset threshold value.
2. The hot air pressure control method according to claim 1, further comprising, before the obtaining the value of the hot air pressure of the melt-blowing machine in real time:
and acquiring the theoretical rotating speed of the Roots blower corresponding to the target hot air pressure according to the set target hot air pressure.
3. The hot air pressure control method according to claim 2, wherein the determining whether the hot air pressure value satisfies a preset threshold specifically comprises:
acquiring a difference value between the hot air pressure value and the target hot air pressure;
and judging whether the difference value meets a preset PID range parameter.
4. The hot air pressure control method according to claim 3, wherein when the difference does not satisfy a preset PID range parameter, PID operation is performed, and a PID operation result is obtained, and at this time, the output rotating speed of the Roots blower is equal to the sum of the theoretical rotating speed and the PID operation result.
5. The hot air pressure control method according to claim 4, wherein when the difference value meets a preset PID range parameter, the PID operation is exited, and a PID operation result at the time of exiting is obtained, and at the time, the output rotating speed of the Roots blower is equal to the sum of the theoretical rotating speed and the PID operation result at the time of exiting.
6. A hot air pressure control system for a meltblowing machine, comprising:
the air pressure sensor is used for acquiring the hot air pressure value of the melt-blowing machine in real time;
the controller, the controller with the wind pressure sensor and be used for carrying hot-blast roots's fan to connect, the controller is used for according to predetermineeing the threshold value with hot-blast pressure value adjusts roots's fan's rotational speed.
7. The hot air pressure control system according to claim 6, further comprising an input module and a data processing module, wherein the input module is connected with the controller and the data processing module, the input module is used for inputting a target hot air pressure, and the data processing module is used for acquiring the theoretical rotating speed of the Roots blower according to the target hot air pressure.
8. The hot air pressure control system according to claim 7, wherein the controller comprises a PID operation module, and the PID operation module is used for acquiring the output rotating speed of the Roots blower according to the hot air pressure value and the theoretical rotating speed of the Roots blower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011049430.4A CN112226832A (en) | 2020-09-29 | 2020-09-29 | Hot air pressure control method and system for melt blowing machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011049430.4A CN112226832A (en) | 2020-09-29 | 2020-09-29 | Hot air pressure control method and system for melt blowing machine |
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| CN112226832A true CN112226832A (en) | 2021-01-15 |
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| CN111472053A (en) * | 2020-05-26 | 2020-07-31 | 东莞市力创机械有限公司 | Temperature and pressure sensing automatic control melt-blowing machine and textile fabric fiber forming process thereof |
| CN111607903A (en) * | 2020-06-23 | 2020-09-01 | 东莞市宜康智能科技有限公司 | Melt-blown fabric production equipment |
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2020
- 2020-09-29 CN CN202011049430.4A patent/CN112226832A/en active Pending
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| WO2003035367A1 (en) * | 2001-10-19 | 2003-05-01 | Toyo Boseki Kabushiki Kaisha | Method for producing formed polybenzazole product |
| JP2007077522A (en) * | 2005-09-13 | 2007-03-29 | Toray Ind Inc | Laminated nonwoven fabric and filtration material produced by using the same |
| CN201485582U (en) * | 2009-08-17 | 2010-05-26 | 桐昆集团股份有限公司 | POY network yarn air pressure device |
| CN203303753U (en) * | 2013-06-28 | 2013-11-27 | 辽宁天泽产业集团大庆天泽有限公司 | Far infrared digital control melt-blown filter element production line |
| CN111472053A (en) * | 2020-05-26 | 2020-07-31 | 东莞市力创机械有限公司 | Temperature and pressure sensing automatic control melt-blowing machine and textile fabric fiber forming process thereof |
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