Automatic control method and system based on polyester relaxation heat setting drying

Abstract

The invention discloses an automatic control method and system based on polyester relaxation heat setting drying. The process executed by the automatic control method through the control system comprises the steps that S1, the running speed of a post-spinning drafting combination machine is monitored in real time; presetting corresponding chain plate running speeds when the drafting combination machine runs at low, medium and high speeds, and controlling a chain plate frequency converter to control the chain plate to run at the corresponding speed so as to guarantee the drying time of tows in a drying machine when the drafting production speed of the drafting combination machine changes; s2, monitoring the running speed of the cut-off equipment in real time; and presetting the corresponding oiling machine running speed when the cut-off equipment runs at the low speed, the medium speed and the high speed, and controlling the oiling machine spraying frequency converter to run at the corresponding speed, so that the oiling machine can automatically carry out oil spraying quantity matching control along with the change of the running speed of the cut-off equipment. The speed of the chain plate of the dryer can be automatically adjusted according to the real-time speed of post-spinning drafting production, so that accurate temperature control and an efficient drying process are realized, and the quality and the production efficiency of polyester products are improved.

Description

Technical Field

[0001] The invention relates to the technical field of polyester processing, and in particular to an automatic control method and a control system based on polyester relaxation, heat setting and drying. Background Art

[0002] In the polyester production process, the relaxation heat setting and drying effect has a crucial impact on the quality of the finished tow, among which the fiber drying moisture content and cutting length are very important indicators. However, the drying control system in the prior art has problems such as low efficiency and insufficient precision, as follows: 1. Since the drafting production line needs to slow down to deal with roller entanglement and barrel entanglement during normal production, the existing polyester dryer control system, the post-drafting combined machine and the cutting machine are all controlled separately to execute the speed of normal post-spinning drafting. However, when the post-spinning drafting has roller entanglement and other speed reduction conditions, the speeds of the various machines on site will not match, causing the thickness of the fiber tow in the dryer to change, affecting the drying effect and the problem of low moisture content; 2. There is an oiling spraying device at the tail of the dryer to ensure the moisture return rate of the tow, which sprays oil on the fiber before the tow is cut. However, if the cutting is abnormally decelerated or the machine is shut down due to a fault, the tow overspray speed is reduced, but the traditional oiling spraying speed is not reduced, which will cause the amount of oil sprayed on the tow to be much greater than the normal speed spraying amount, resulting in excessive oil content in the tow, and the cutting machine is prone to slipping, affecting the tow cutting length, and thus affecting the tow grade; 3. In the production of tows, curling sometimes produces waste silk, which needs to be cut and switched to the waste silk channel instead of entering the finished product packaging. The traditional solution is to spray paint in the waste silk area in red, and immediately cut off the reminder. When the camera observes abnormal silk that needs to be processed, it is switched. Because the polyester fiber production line has to go through a 40-70 meter dryer from curling to cutting, the time from tow to cutting varies according to the chain speed, and the waiting time from curling to cutting of waste silk is long and uncertain. In addition, because the polyester production line is a continuous production operation, night shift workers are prone to concentrated semi-fatigue, which will result in missed switching of waste silk, affecting the grade standard of finished silk and causing losses to customers. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention proposes a new automatic control method based on polyester relaxation heat setting drying, which can automatically adjust the dryer chain speed according to the real-time speed of post-spinning drafting production, thereby achieving precise temperature control and efficient drying process, and improving the quality and production efficiency of polyester products.

[0004] Invention technical solution: A control method based on polyester relaxation heat setting and drying, characterized in that the process performed by the control system includes: S1, real-time monitoring of the running speed of the post-spinning drafting machine; preset the corresponding chain running speeds of the drafting machine when it is running at low, medium and high speeds, and control the chain inverter to control the chain running at the corresponding speed to ensure the drying time of the tow in the dryer when the drafting production speed of the drafting machine changes; S2, real-time monitoring of the running speed of the cutting device; preset the corresponding running speed of the oiler when the cutting device is running at low, medium and high speeds, and control the oiler spray inverter to run at the corresponding speed, so as to realize the matching control of the oil injection amount of the oiler with the change of the running speed of the cutting device.

[0005] The control method based on polyester relaxation heat setting and drying, the process performed by the control system also includes: S3 monitors the waste silk trigger signal and the chain running speed in real time. When the waste silk trigger signal is received, the specific time from the waste silk to the cutting machine is calculated according to the path length from the silk bundle entering the dryer to the cutting machine divided by the chain speed, and the waste silk switching is reminded to control to prevent the cutting machine from missing switching and the waste silk from entering the finished product packaging line, affecting the overall quality level of the finished product silk.

[0006] The control method of the present invention can automatically adjust the chain plate speed and oiling speed according to the real-time running speed changes of the front and rear equipment, and can also accurately transmit the substandard tow produced by curling to the operator through intelligent calculation to provide instructions for cutting, effectively ensuring the drying effect and quality of the tow at abnormal speeds in tow production. According to the real-time changes in the running speed of the post-spinning drafting machine and the real-time changes in the running speed of the cutting machine, the chain plate running speed and the oiling inverter running speed corresponding to the matching process data are preset to achieve matching control of the fiber drying time and the oil injection flow rate when the production line speed changes.

[0007] The control method based on polyester relaxation heat setting and drying is described, the speed ratio of the post-spinning drafting machine to the chain plate speed is controlled at 1:5.8-6.2. For example, when the post-spinning drafting speed is 240M / min, the corresponding chain plate frequency conversion speed is 1400r / min. If the processing winding roller is reduced to the medium speed of 80M / min, the corresponding chain plate speed is 550r / min, and the normal wire cutting speed is 240m / min. If the main drafting speed is set to other values, the chain plate speed is also changed accordingly, and the cutting is based on the normal wire cutting speed.

[0008] The control method based on polyester relaxation heat setting and drying corresponds to a tow oil injection frequency of 40HZ. If the speed needs to be increased by more than 1% due to the front pile or maintenance, such as the post-spinning drafting speed is increased to 260M / min, the oil injection frequency is correspondingly increased to 45HZ. If the speed is reduced to 100M / min (24% reduction) due to cutting, the oil spraying is automatically reduced to 30HZ. The above data derives the corresponding frequency based on the tow detection quality data, and is preset on the touch screen to automatically correspond to the production speed relationship.

[0009] An automatic control system based on polyester relaxation heat setting and drying comprises a PLC controller (1), a touch screen (4), and a post-spinning drafting machine (2) operation control inverter, a chain plate inverter (5) and an oiling inverter (6), wherein the PLC controller (1) is implanted with and runs the control method described above and is executed through the inverter; wherein: The touch screen (4) is connected to the PLC controller (1) for communication and is used to preset and display control parameters; The post-spinning drafting machine (2) is connected to the PLC controller (1) via a PN communication network cable. The PLC controller (1) obtains the change in the post-spinning drafting operation speed and controls the speed of the chain plate inverter (5) according to the data corresponding to the preset low, medium and high speeds, so as to ensure the drying time of the tow in the dryer when the drafting production speed changes. The cutting machine (3) is connected to the PLC controller (1) via a PN communication network cable. The PLC controller (1) obtains the change in the running speed of the cutting machine and controls the speed of the oil spraying inverter (6) according to the data corresponding to the low, medium and high speeds preset on the touch screen (4); so that the oil spraying amount is automatically switched as the cutting speed changes; The polyester relaxation heat setting drying control system comprises a cutting device (3). The PLC controller (1) calculates the exact time from the waste silk entering the dryer to the cutting device (3) according to the acquired waste silk trigger signal and the running speed of the chain plate inverter (5), and controls the waste silk switching sound and light alarm light (7) to remind the cutting operator, so as to prevent the waste silk from being missed and entering the finished product packaging line, affecting the excellent grade of the overall finished product silk.

[0010] Beneficial effects of the invention: The present invention is based on an intelligent control method for polyester relaxation, heat setting and drying. Compared with traditional control methods, the present invention can automatically adjust the chain speed and oiling speed according to the real-time speed changes of the front and rear equipment, and can also accurately transmit the unqualified yarn bundles produced by curling to the operation instructions through intelligent calculation. It can monitor the abnormal conditions before and after the production line in real time to automatically and autonomously control the drying chain speed and oil injection amount, effectively ensuring that the yarn drying effect cannot be guaranteed at abnormal speeds in yarn production, and can give timely and accurate reminders to waste yarn operators in real time, avoiding the possible decline in fiber quality caused by this.

[0011] 1. The present invention achieves the matching of drying and oiling processes for various speed conditions in the drying process of the polyester production line by adopting advanced control means. The production situation of the production line is monitored in real time, and the production process is automatically controlled in real time according to the corresponding control strategy based on the specific production situation. It can effectively avoid the waste silk generated when the speed is reduced due to abnormal conditions such as winding rollers, as well as the untimely processing caused by negligence during production fatigue, and the inconsistent cutting length caused by excessive oil spraying. The system continuously monitors the real-time speed of the production line to ensure the drying quality of the dried fiber in the entire production process.

[0012] 2. The present invention can automatically adjust the dryer chain speed according to the real-time speed of post-drafting production, thereby effectively reducing the situation in which the moisture content is too high due to short drying time and the drying effect affects the fiber quality index when the post-drafting combined machine abnormally slows down; when the post-spinning drafting combined machine is increased to the process high speed, the speed of the dryer chain increases accordingly, effectively avoiding the speed mismatch that occurs in traditional control and affects the drying effect; instant processing and reminder; response speed reaches millisecond level.

[0013] 3. The control method of the present invention adjusts the oil spraying speed according to the real-time running speed of cutting, thereby taking into account the process purpose of moisture return rate and avoiding the situation where the oil spraying frequency remains unchanged due to the high oil content of the yarn bundle caused by the speed reduction, resulting in slippage during cutting and unstable control of the yarn bundle length; at the same time, according to the specific path distance from the yarn bundle entering the dryer to the cutting, and the real-time speed of the drying chain, the specific time in seconds for the waste silk to reach the cutting is accurately calculated, and the cutting worker is given an accurate sound and light alarm reminder, which effectively reduces the situation of waste silk leakage switching, affecting the finished silk grade standard and causing losses to customers.

[0014] 4. The present invention is based on the intelligent control method for polyester relaxation heat setting and drying, which has the advantages of improving control accuracy, energy saving, cost reduction and efficiency improvement, and convenient operation, providing more reliable technical support for polyester production. This control system has both network cable communication links, convenient project implementation, and real-time and accurate reminders to waste silk operators on time, avoiding the possible degradation of fiber quality caused by this. It has been implemented on the experimental site with obvious results and excellent feedback.

[0015] From an economic point of view, the application of the present invention can bring significant economic benefits to enterprises. It reduces the fiber degradation loss caused by abnormal production conditions, improves the ability to control product quality, and enhances the market competitiveness of enterprises. The control method of the present invention has been verified by implementing experiments in user factories, and it has been determined that it can bring significant economic benefits to enterprises and reduce losses caused by production interruptions. It is estimated that the annual loss is reduced by 15% for every ton of fiber output per day, which improves production efficiency and product quality and enhances the market competitiveness of enterprises. From a social point of view, the promotion and application of the present invention will help promote the development of related industries, create more employment opportunities and wealth for the society, and has very important social significance.

[0016] In short, the present invention has played a positive and important role in ensuring production safety, improving equipment reliability, promoting economic development and creating social value, and has significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure shows a block diagram of the structure of the automatic control system based on polyester relaxation heat setting and drying of the present invention; Figure 2 The step S1 is shown as involving the system hardware composition and execution process; Figure 3 The step S2 is shown as involving the system hardware composition and execution process; Figure 4 The step S3 is shown as involving the system hardware composition and execution process.

[0018] In the figure, the numbers represent: 1. PLC controller, 2. post-spinning drafting machine, 3. cutting device / cutting machine, 4. HMI touch screen, 5. chain plate inverter, 6. oiling machine spray inverter, 7. waste silk switching sound and light alarm. DETAILED DESCRIPTION

[0019] In order to make the technical concept and advantages of the invention more clearly understood, the technical solution of the invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the following embodiments are only used to explain and illustrate the preferred implementation of the invention and should not constitute a limitation on the scope of protection of the patent claim of the invention.

[0020] Example 1 Figure 1 The block diagram of the automatic control system for polyester relaxation heat setting and drying according to the present invention is shown in FIG. Figure 1 The present invention is based on the automatic control method of polyester relaxation heat setting and drying, and the process performed by the control system includes: S1, real-time monitoring of the running speed of the post-spinning drafting machine; preset the corresponding chain running speed when the drafting machine is running at low, medium and high speeds, and control the chain inverter to control the chain running at the corresponding speed to ensure the drying time of the tow in the dryer when the drafting production speed of the drafting machine changes. Figure 2 ; S2, real-time monitoring of the running speed of the cutting device; preset the corresponding oiler running speed when the cutting device is running at low, medium and high speed, and control the oiler spray inverter to run at the corresponding speed, so as to achieve the matching control of the oiler spray amount with the change of the running speed of the cutting device. Figure 3 ; S3, real-time monitoring of the waste silk trigger signal and the chain running speed. When the waste silk trigger signal is received, the specific time from the waste silk to the cutting machine is calculated according to the path length from the tow entering the dryer to the cutting machine divided by the chain speed, and the waste silk switching is reminded to prevent the cutting machine from missing the switching of waste silk into the finished product packaging line, affecting the overall quality of the finished silk. Figure 4 .

[0021] Specifically, the ratio of the post-spinning drafting machine speed to the chain plate speed is controlled at about 1:6. For example, when the post-spinning drafting speed is 240M / min, the corresponding chain plate frequency conversion speed is 1400r / min. If the roller winding speed is reduced to a medium speed of 80M / min, the corresponding chain plate speed is 550r / min, and the normal wire cutting speed is 240m / min. If the main drafting speed is set to other values, the chain plate speed will also change accordingly, and the cutting will be based on the normal wire cutting speed. The corresponding tow oil injection frequency is 40HZ. If the speed needs to be increased by more than 1% due to the front pile or maintenance, such as the post-spinning drafting speed is increased to 260M / min, the oil injection frequency will be increased to 45HZ accordingly. If the speed is reduced to 100M / min (24% reduction) when cutting, the oil spray will automatically reduce to 30HZ. The above data is based on the tow detection quality data to obtain the corresponding frequency, which is preset on the touch screen to automatically correspond to the production speed relationship.

[0022] The control method and control system of the present invention can automatically adjust the chain plate speed and the oiling speed according to the real-time operating speed changes of the front and rear equipment, and can also accurately transmit the substandard quality of the curled to the operator through intelligent calculation for cutting instructions, thereby effectively ensuring the drying effect and quality of the tow at abnormal speeds in tow production.

[0023] The present invention is based on an automatic control method and system for polyester relaxation, heat setting and drying. According to the real-time changes in the running speed of the post-spinning drafting machine and the real-time changes in the running speed of the cutting machine, the chain plate running speed and the oiling inverter running speed corresponding to the matching process data are preset to achieve matching control of the fiber drying time and the oil injection flow rate when the production line speed changes.

[0024] Example 2 This embodiment is based on the automatic control system of polyester relaxation heat setting and drying. Figure 1 As shown, the system includes a PLC controller 1, an HMI touch screen 4, and a post-spinning drafting machine 2 operation control inverter, a chain plate inverter 5 and an oiling machine spray inverter 6, as well as a cutting device / cutting machine 3. The PLC controller 1PN communication network cable connects the post-spinning drafting machine 2, the cutting machine 3, the touch screen 4, the chain plate inverter 5, and the oiling machine spray inverter 6 to form a communication network. The PLC controller runs the control method described in Example 1 and is executed through the inverter control; wherein, The touch screen 4 is connected to the PLC controller 1 for presetting and displaying control parameters; The post-spinning drafting machine 2 is connected to the PLC controller 1 via a PN communication network cable. The PLC controller 1 obtains the change in the post-spinning drafting operation speed, and controls the speed of the chain plate inverter 5 according to the data corresponding to the low, medium and high speeds preset on the touch screen 4, so as to ensure the drying time of the tow in the dryer when the drafting production speed changes; The cutting machine 3 is connected to the PLC controller 1 through a PN communication network cable. The PLC controller 1 obtains the change of the running speed of the cutting machine and controls the speed of the oiling machine spray inverter 6 according to the data corresponding to the low, medium and high speeds preset on the touch screen 4, so as to achieve automatic switching of the oil spraying amount with the change of the cutting speed. The control system based on polyester relaxation heat setting and drying also includes a PLC controller 1 that obtains the waste silk trigger signal and the running speed of the chain plate inverter 5, divides the chain plate speed by the path length from the yarn bundle entering the dryer to the cutting machine 3, and controls the waste silk switching sound and light alarm light 7 to remind the cutting operator to prevent the waste silk from being missed from entering the finished product packaging line and affecting the excellent grade of the overall finished silk.

[0025] like Figure 2 As shown, the PLC controller collects the real-time speed of the post-spinning drafting machine through the network cable connection using the Profinet protocol. When the speed changes, the PLC controller compares the real-time speed with the process matching speed preset in the touch screen, analyzes and processes it, and adjusts the speed of the actuator chain plate inverter to achieve the speed change of the post-spinning drafting machine to match the process, thereby reducing the impact of the speed change of the post-drafting machine on the relaxation, heat setting and drying effect, resulting in a reduction in the grade of the finished fiber product.

[0026] like Figure 3As shown: The PLC controller collects the real-time speed of the cutter through the network cable connection using the Profinet protocol. When the speed changes, the PLC controller compares the real-time speed with the process matching speed preset in the touch screen, performs analysis and processing, and adjusts the speed of the actuator oiling inverter to achieve process matching of the speed change of the cutter, thereby reducing slippage caused by excessive oil injection due to the change in the speed of the cutter, affecting the cutting length, and causing the grade of the finished fiber product to be downgraded.

[0027] like Figure 4 As shown: The PLC controller collects the real-time speed of the chain plate inverter through the Profinet protocol via a network cable. When the speed changes, the PLC controller adjusts the time when the waste silk reaches the cutting machine by calculating the real-time speed, triggering the waste silk switching sound and light alarm, and follows the production system to provide more accurate cutting reminders, providing better protection for ensuring the quality of the fiber.

[0028] The above network cable laying requires Category 6A network cable wiring, and needs to go through the control bridge, which is laid separately from the main power bridge cable to avoid signal interference. The waste wire switching sound and light alarm of the cutting machine described in the present invention needs to be connected to a 24V power supply and installed next to the cutting operation table to ensure that the operator can effectively receive the alarm signal.

[0029] The present invention obtains the real-time operating speed of the post-spinning drafting machine (2) and adjusts the speed of the dryer chain inverter (5) accordingly, and obtains the real-time operating speed of the cutting machine (3) to adjust the speed of the oiling machine spray inverter (6) and directly displays the data on the touch screen (4), and saves the data information for a period of time, so as to facilitate tracing.

[0030] The above description is only a preferred embodiment of the present invention and does not constitute a limitation of the present invention. Under the guidance of the prior art, those skilled in the art can make other modifications to the implementation of the present invention without creative work. Any modification made within the spirit and principle of the present invention or simple replacement or equivalent substitution using conventional technical means in the field should be included in the protection scope of the present invention.

Claims

1. An automatic control method based on polyester relaxation heat setting and drying, characterized in that: The processes performed by the control system include: S1, real-time monitoring of the running speed of the post-spinning drafting machine; preset the corresponding chain running speeds of the drafting machine when it is running at low, medium and high speeds, and control the chain inverter to control the chain running at the corresponding speed to ensure the drying time of the tow in the dryer when the drafting production speed of the drafting machine changes; S2, real-time monitoring of the running speed of the cutting device; preset the corresponding running speed of the oiler when the cutting device is running at low, medium and high speeds, and control the oiler spray inverter to run at the corresponding speed, so as to realize the matching control of the oil injection amount of the oiler with the change of the running speed of the cutting device.

2. The control method for polyester relaxation heat setting and drying according to claim 1, characterized in that: The processes performed by the control system also include: S3 monitors the waste silk trigger signal and the chain running speed in real time. When the waste silk trigger signal is received, the specific time from the waste silk to the cutting machine is calculated according to the path length from the silk bundle entering the dryer to the cutting machine divided by the chain speed, and the waste silk switching is reminded to control to prevent the cutting machine from missing the switching of waste silk into the finished product packaging line, affecting the overall quality level of the finished silk.

3. The control method for polyester relaxation heat setting and drying according to claim 1 or 2, characterized in that: The ratio of the post-spinning drafting machine speed to the chain speed is controlled at 1:5.8-6.

2. When the post-spinning drafting speed is 240M / min, the corresponding chain frequency conversion speed is 1400r / min. If the roller winding is reduced to medium speed 80M / min, the corresponding chain speed is 550r / min. If the low speed is 45M / min, the corresponding speed is 80r / min. The normal cutting speed is 240m / min.

4. The control method for polyester relaxation heat setting and drying according to claim 3, characterized in that: The corresponding frequency of oil injection for the tow is 40HZ. If the speed needs to be increased by more than 1% due to the pile of yarns in front or maintenance, such as the speed of post-spinning drafting increases to 260M / min, the oil injection frequency will be increased to 45HZ accordingly. If the speed is reduced to 100M / min due to cutting, the oil spraying will automatically reduce the speed to 30HZ. The above data are used to obtain the corresponding frequency based on the tow detection quality data, and the corresponding production speed relationship is preset on the touch screen.

5. An automatic control system based on polyester relaxation heat setting and drying, comprising a PLC controller (1), a touch screen (4), and a post-spinning drafting machine (2) operation control inverter, a chain plate inverter (5) and an oiling inverter (6), characterized in that: The PLC controller (1) is implanted with and runs the control method of claim 1 and is executed by a frequency converter; wherein: The touch screen (4) is connected to the PLC controller (1) for communication and is used to preset and display control parameters; The post-spinning drafting machine (2) is connected to the PLC controller (1) via a PN communication network cable, and the PLC controller (1) obtains the change in the post-spinning drafting running speed, and controls the speed of the chain plate inverter (5) according to the data corresponding to the preset low, medium and high speeds; The cutting machine (3) is connected to the PLC controller (1) via a PN communication network cable. The PLC controller (1) obtains the change in the running speed of the cutting machine and controls the speed of the oil spraying inverter (6) according to the data corresponding to the low, medium and high speeds preset on the touch screen (4); so as to achieve automatic switching of the oil spraying amount as the cutting speed changes.

6. The polyester relaxation heat setting and drying control system according to claim 5, characterized in that: The invention comprises a cutting device (3), a PLC controller (1) which calculates the exact time from when the waste silk enters the dryer to when the waste silk cuts off the device (3) according to the waste silk trigger signal and the running speed of the chain plate inverter (5), and controls the waste silk to switch on an audible and visual alarm light (7) to remind the cutting operator.

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