阅读说明：本技术 一种用于提升薄膜热稳定性的控制设备 (Control equipment for improving thermal stability of thin film ) 是由 莫超 田岱峰 沙启成 于 2020-11-18 设计创作，主要内容包括：本发明提出了一种用于提升薄膜热稳定性的控制设备,包括烘箱装置以及设置在烘箱装置进料端的放卷装置、设置在烘箱装置出料端的收卷装置；烘箱装置通过设置多段独立温控的烘箱并对薄膜进行恒低张力控制而实现消除薄膜的内应力,任意相邻两个烘箱之间均设有第一张力隔断装置；放卷装置用于向烘箱装置放卷膜料,并通过控制放卷段中薄膜张力实现对薄膜的恒低张力放卷,放卷装置与烘箱装置之间设有第二张力隔断装置；收卷装置用于对烘箱装置的膜料进行收卷并通过控制收卷段中的薄膜的张力而实现对薄膜的恒力矩收卷,收卷装置与烘箱装置之间设有第三张力隔断装置。(The invention provides control equipment for improving the thermal stability of a film, which comprises an oven device, an unreeling device arranged at the feed end of the oven device and a reeling device arranged at the discharge end of the oven device, wherein the unreeling device is arranged at the feed end of the oven device; the oven device is provided with a plurality of sections of independently temperature-controlled ovens and performs constant low tension control on the film to eliminate the internal stress of the film, and a first tension isolating device is arranged between any two adjacent ovens; the unwinding device is used for unwinding the film material to the drying oven device and realizing constant low-tension unwinding of the film by controlling the tension of the film in the unwinding section, and a second tension isolating device is arranged between the unwinding device and the drying oven device; the winding device is used for winding the film material of the oven device and realizing constant-torque winding of the film by controlling the tension of the film in the winding section, and a third tension isolating device is arranged between the winding device and the oven device.)

1. A control device for improving the thermal stability of a film is characterized by comprising an oven device, an unreeling device arranged at the feeding end of the oven device and a reeling device arranged at the discharging end of the oven device;

the oven device is provided with a plurality of sections of independently temperature-controlled ovens and performs constant low tension control on the film to eliminate the internal stress of the film, and a first tension isolating device is arranged between any two adjacent ovens;

the unwinding device is used for unwinding the film material to the drying oven device and realizing constant low-tension unwinding of the film by controlling the tension of the film in the unwinding section, and a second tension isolating device is arranged between the unwinding device and the drying oven device;

the winding device is used for winding the film material of the oven device and realizing constant-torque winding of the film by controlling the tension of the film in the winding section, and a third tension isolating device is arranged between the winding device and the oven device.

2. The control device for improving the thermal stability of the thin film according to claim 1, wherein the oven is sequentially divided into a heating area and a heat preservation area from the feeding end to the discharging end, and a plurality of independently controlled heating area heaters and heat preservation area heaters which are arranged up and down are respectively arranged in the heating area and the heat preservation area.

3. The control device for improving the thermal stability of the thin film according to claim 1, wherein the first tension separation device comprises a first fixing frame, and a first roller, a second roller and a third roller which are arranged on the first fixing frame, the first roller and the second roller are arranged in parallel, the third roller is arranged below the first roller and the second roller and between the first roller and the second roller, the diameter of the third roller is larger than that of the first roller and the second roller, a first driving roller matched with the third roller is arranged below the third roller, and the first driving roller is connected with a first air cylinder.

4. The control device for improving the thermal stability of the thin film according to any one of claims 1 to 3, wherein the unwinding device comprises a first frame, and an unwinding roller, a floating roller, a corona roller and an unwinding tension detection roller which are sequentially mounted on the first frame, the film material discharged from the unwinding roller sequentially bypasses the floating roller, the corona roller and the unwinding tension detection roller and enters the second tension isolating device, an adjusting disc for adjusting the position of the floating roller in the vertical direction is mounted on the first frame, a displacement sensor is mounted on the floating roller, and an unwinding tension sensor is mounted on the unwinding tension detection roller.

5. The control apparatus for improving thermal stability of a film according to any one of claims 1 to 3, wherein the second tension cut-off device comprises a first squeeze roller, a second driving roller engaged with the first squeeze roller, and a second air cylinder for driving the second driving roller to move, the first squeeze roller and the second driving roller applying a squeezing force to the film passing therebetween.

6. The control device for improving the thermal stability of the thin film according to any one of claims 1 to 3, wherein the winding device comprises a second frame, and a first guide roller, a second guide roller and a winding roller which are sequentially mounted on the second frame, the thin film material bypasses the first guide roller and the second guide roller to enter the winding roller, the winding roller is connected with a magnetic powder clutch, the magnetic powder clutch is connected with a torque motor through a synchronous belt and is controlled by a winding tension controller to output a winding torque, and the maximum winding torque output by the torque motor is controlled by a frequency converter.

7. The control apparatus for improving the thermal stability of a film according to any one of claims 1 to 3, wherein the third tension cut-off device comprises a second squeeze roller, a third driving roller engaged with the second squeeze roller, and a third air cylinder for driving the third driving roller to move, and the third squeeze roller and the third driving roller apply a squeezing force to the film passing therebetween.

8. The control device for improving the thermal stability of the thin film according to any one of claims 1 to 3, wherein a dust removing device is further arranged between the winding device and the third tension separation device, and the dust removing device comprises a dust removing roller and a dust removing driving roller matched with the dust removing roller.

Technical Field

The invention relates to the technical field of plastic film production, in particular to control equipment for improving the thermal stability of a film.

Background

At present, the control equipment for improving the thermal stability of the film adopts common winding and unwinding equipment, a drying oven with a single temperature zone is added before winding, the improvement effect of the thermal stability is poor, the winding is uneven, especially the regional thermal stability is large in fluctuation, and the efficiency is low.

Disclosure of Invention

Based on the technical problems in the background art, the invention provides a control device for improving the thermal stability of a film.

The invention provides control equipment for improving the thermal stability of a film, which comprises an oven device, an unreeling device arranged at the feed end of the oven device and a reeling device arranged at the discharge end of the oven device, wherein the unreeling device is arranged at the feed end of the oven device;

the oven device is provided with a plurality of sections of independently temperature-controlled ovens and performs constant low tension control on the film to eliminate the internal stress of the film, and a first tension isolating device is arranged between any two adjacent ovens;

the unwinding device is used for unwinding the film material to the drying oven device and realizing constant low-tension unwinding of the film by controlling the tension of the film in the unwinding section, and a second tension isolating device is arranged between the unwinding device and the drying oven device;

the winding device is used for winding the film material of the oven device and realizing constant-torque winding of the film by controlling the tension of the film in the winding section, and a third tension isolating device is arranged between the winding device and the oven device.

Preferably, the oven is sequentially divided into a heating area and a heat preservation area from the feeding end to the discharging end, and a plurality of independently controlled heating area heaters and heat preservation area heaters which are arranged up and down are respectively arranged in the heating area and the heat preservation area.

Preferably, the first tension isolating device comprises a first fixing frame, and a first roller, a second roller and a third roller which are arranged on the first fixing frame, wherein the first roller and the second roller are arranged in parallel, the third roller is positioned below the first roller and the second roller and between the first roller and the second roller, the diameter of the third roller is larger than that of the first roller and the second roller, a first driving roller matched with the third roller is arranged below the third roller, and the first driving roller is connected with a first air cylinder.

Preferably, unwinding device includes first frame and installs unwinding roller, the dancer rools, the corona roller in proper order on first frame, unreel tension detection roller, the membrane material that unwinding roller emits walks around dancer rools, corona roller in proper order, unreel tension detection roller and get into second tension isolating device, install the adjustment disk that is used for adjusting the dancer rools position in vertical side on the first frame, install displacement sensor on the dancer rools, unreel and install on the tension detection roller and unreel tension sensor.

Preferably, the second tension cut-off device comprises a first pressing roller, a second driving roller matched with the first pressing roller and a second air cylinder for driving the second driving roller to move, and the first pressing roller and the second driving roller apply the pressing force to the film material passing through the first pressing roller and the second driving roller.

Preferably, the winding device comprises a second rack, a first guide roller, a second guide roller and a winding roller, the first guide roller, the second guide roller and the winding roller are sequentially mounted on the second rack, the film material bypasses the first guide roller and the second guide roller to enter the winding roller, the winding roller is connected with a magnetic powder clutch, the magnetic powder clutch is connected with a torque motor through a synchronous belt, the magnetic powder clutch is controlled by a winding tension controller to output winding torque, and the maximum output winding torque of the torque motor is controlled by a frequency converter.

Preferably, the third tension cut-off device comprises a second pressing roller, a third driving roller matched with the second pressing roller and a third air cylinder for driving the third driving roller to move, and the third pressing roller and the third driving roller apply the pressing force to the film material passing through the third pressing roller and the third driving roller.

Preferably, a dust removal device is further arranged between the winding device and the third tension partition device, and the dust removal device comprises a dust removal roller and a dust removal driving roller matched with the dust removal roller.

The control equipment for improving the thermal stability of the film, provided by the invention, has the advantages that the tension is controlled in a segmented manner, the internal stress is eliminated by multiple annealing, the reversal local optimization is realized, the upper part and the lower part of an oven temperature zone are independently arranged, and the thermal stability and the annealing efficiency of the film are greatly improved.

Drawings

FIG. 1 is a schematic structural diagram of a control apparatus for improving thermal stability of a film according to the present invention;

FIG. 2 is a control principle topology diagram of a control device for improving thermal stability of a film according to the present invention;

FIG. 3 is a control logic diagram of the unwinding dancer roller in the control device for improving the thermal stability of the film according to the present invention;

FIG. 4 is a logic flow diagram of a constant tension control logic in a control apparatus for improving thermal stability of a film according to the present invention;

fig. 5 is a logic program diagram of a rolling tension in a control device for improving thermal stability of a film according to the present invention.

Detailed Description

Referring to fig. 1, the invention provides a control device for improving thermal stability of a film, which comprises an oven device, an unreeling device arranged at a feed end of the oven device, and a reeling device arranged at a discharge end of the oven device.

The oven device realizes eliminating the internal stress of the film by arranging the oven 1 with multiple sections of independent temperature control and carrying out constant low tension control on the film, and a first tension isolating device is arranged between any two adjacent oven 1.

The unwinding device is used for unwinding the film material to the drying oven device and realizing constant low-tension unwinding of the film by controlling the tension of the film in the unwinding section, and a second tension isolating device is arranged between the unwinding device and the drying oven device.

The winding device is used for winding the film material of the oven device and realizing constant-torque winding of the film by controlling the tension of the film in the winding section, and a third tension isolating device is arranged between the winding device and the oven device.

The invention cuts off the tension and controls independently; through tension collection of the PLC, according to a set curve of an operator, the PLC sends an instruction to the torque motor through calculation to realize curve tension control; the oven is controlled by a plurality of independent temperature zones to compensate the difference of the thermal stability of the film; the two sections of drying ovens, even the multiple sections of drying ovens are matched for use, so that the heat stability and the rolling smoothness of the product are improved.

In a specific embodiment, the oven device is provided with two sections of independently temperature controlled ovens 1. From the feed end towards the discharge end direction, divide into heating zone, heat preservation district in proper order in each oven 1, install a plurality of independent control and heating zone heater 2, the heat preservation district heater 3 of arranging from top to bottom in heating zone, the heat preservation district respectively. The temperature is set according to the characteristics of the two surfaces of the film and the difference of the heat stability of the subareas. The two sections of drying ovens are controlled in a combined mode, even the multiple sections of drying ovens are controlled in a combined mode according to process requirements, the temperature area of each section of drying oven is controlled in a partition mode, the front section of drying oven mainly eliminates internal stress of the film, thermal stability is improved, the rear section of drying oven has the function of eliminating residual internal stress, film tension in the drying ovens is increased properly, thermal stability of the film is improved, and flatness of the film surface is improved. Through the operation of the winding device at a set tension curve, the thermal stability and the flatness of the film roll are greatly improved, and the overall production efficiency is at least twice in the industry.

In a specific embodiment, the first tension separation device comprises a first fixing frame 4, and a first roller 5, a second roller 6 and a third roller 7 which are installed on the first fixing frame 4, wherein the first roller 5 and the second roller 6 are arranged in parallel, the third roller 7 is located below the first roller 5 and the second roller 6 and between the first roller 5 and the second roller 6, the diameter of the third roller 7 is larger than the diameter of the first roller 5 and the diameter of the second roller 6, a first driving roller 8 matched with the third roller 7 is arranged below the third roller 7, and the first driving roller 8 is connected with a first air cylinder 9. By arranging the first roller 5, the second roller 6 and the third roller 7, a large wrap angle is formed when the film passes through, and tension separation is realized.

In a specific embodiment, the unwinding device includes a first frame 10, and an unwinding roller 11, a floating roller 12, a corona roller 13, and an unwinding tension detecting roller 14 sequentially installed on the first frame 10, a film material discharged from the unwinding roller 11 sequentially bypasses the floating roller 12, the corona roller 13, and the unwinding tension detecting roller 14 to enter a second tension isolating device, an adjusting disk 15 for adjusting the position of the floating roller 12 in the vertical direction is installed on the first frame 10, a displacement sensor is installed on the floating roller 12, and an unwinding tension sensor is installed on the unwinding tension detecting roller 14.

In a specific embodiment, the second tension cut-off device comprises a first pressing roller 16, a second driving roller 17 matched with the first pressing roller 16 and a second air cylinder 18 used for driving the second driving roller 17 to move, and the first pressing roller 16 and the second driving roller 17 apply pressing force to the film material passing through the first pressing roller 16 and the second driving roller 17.

In a specific embodiment, the winding device comprises a second frame 19, and a first guide roller 20, a second guide roller 21 and a winding roller 22 which are sequentially mounted on the second frame 19, the film material bypasses the first guide roller 20 and the second guide roller 21 and enters the winding roller 22, the winding roller 22 is connected with a magnetic powder clutch, the magnetic powder clutch is connected with a torque motor through a driving belt and is controlled by a winding tension controller to output a winding torque, and the maximum output winding torque of the torque motor is controlled by a frequency converter.

In the specific embodiment, the third tension cut-off device comprises a second pressing roller 23, a third driving roller 24 matched with the second pressing roller 23 and a third air cylinder 25 for driving the third driving roller 24 to move, and the third pressing roller and the third driving roller 24 apply pressing force to the film material passing through the third pressing roller and the third driving roller.

In a specific embodiment, a dust removing device is further arranged between the winding device and the third tension separating device, and the dust removing device comprises a dust removing roller 26 and a dust removing driving roller 27 matched with the dust removing roller 26.

Referring to fig. 2, the working principle of the present invention is as follows: and the control equipment controls the tension of unwinding and winding through the PID instruction of the PLC. The unwinding tension is controlled by measuring the position (displacement) of the unwinding floating roller 12 and combining a feedback value and a set value of an unwinding tension sensor through PID instruction processing, and the unwinding tension is kept constant from the unwinding to the winding tension (without the winding tension); the winding tension continuously decreases along with the increasing of the winding diameter, and the winding output tension is controlled after the winding tension is processed through a PID instruction algorithm according to a process preset tension curve (a winding tension and diameter corresponding curve). The PID tension control program of the PLC mainly comprises three parts, namely a floating roller 12 displacement measurement device, a tension feedback device in other forms, an unreeling tension PID and a reeling tension PID.

All the drivers in the invention have a reverse rotation function, when the winding membrane surface has wrinkles, the reverse rotation can be realized, and the wrinkles of the membrane roll are eliminated by passing through the oven again.

Referring to fig. 3, the position of the dancer 12 is measured and determined by a displacement sensor installed on the dancer 12, an analog signal output by the displacement sensor is accessed by an analog module of the PLC, a 300 reading value is filtered to be below &6500 through a comparison instruction to protect the displacement sensor, and data of an address 300 is transmitted to a data register D200 through a transmission instruction after the 300 reading value is filtered through the comparison instruction.

After each start-up, the displacement of the floating roller 12 has more or less deviation, non-origin point and other conditions, and the displacement sensor has certain precision error after the equipment runs for a long time; in order to eliminate the influence and improve the measurement precision and provide an accurate absolute displacement value for the subsequent PID instruction operation, a displacement automatic calibration program is written in the PLC, namely the displacement value/D200 of the floating roller 12, the displacement calibration value of the floating roller 12 (namely the initial displacement value after starting up)/D210 is equal to the displacement value required by the D220/PID instruction. Note that: since most current displacement sensors output BCD (binary code), 16-bit BCD codes in registers of D200 or D220 must be converted into floating point numbers and stored in D230 for PLC floating point operation. And multiplying the D230 by +6.3E-1 through floating point multiplication to obtain a final floating roller 12 displacement measurement value D240 required by the unwinding tension control PID. Note that: the multiplier +6.3E-1 can modify and adjust the multiplying power of the digital quantity according to the analog quantity. If the tension corresponding to the analog quantity of 4-20 mA is 0-100N, the multiplier is 100/20-4-6.25N/mA, and 6.25 is converted into a floating point number. And the multiplier can be programmed and written in a numerical value input element of the HMI touch screen to display and edit a 10-system numerical value, so that later maintenance is more convenient, different types of displacement sensors can be replaced under the condition of not modifying a PLC program, and the interchangeability of parts is improved.

Referring to fig. 4, the working principle of constant tension unwinding is as follows: the unwinding tension is controlled by the displacement of the unwinding floating roller 12. After the HMI touch screen tension D300 edits the setting, the setting confirmation W0.00 on the touch screen is clicked, and the set value is transferred to the register D310. The floating point division instruction sets the measured displacement value D240/D310 of the floating roller 12 to D320, i.e. the displacement value corresponding to the unit tension. The actual value D330 of the unreeling tension measured by the unreeling tension sensor and the unreeling tension coefficient D320 are processed by a PID instruction algorithm to obtain an unreeling tension control value D340, the D340 is processed by an average value instruction for D350 times to obtain a control analog quantity with good linearity, and the control analog quantity is output by an address 200 of an analog quantity output module to control a frequency converter or (and) a meter counter of the unreeling roller 11 (see figure 2). Meanwhile, in order to prevent extreme tension, the output I/O address 100.02 of the unreeling magnetic powder clutch is controlled to output 1 only when the unreeling tension lower limit value D400 is not less than the unreeling tension actual value D330 is not less than the unreeling tension upper limit value D410, and the actual measurement length D500 of the meter counter is not less than the meter counter set length D510. 100.03 is an unwinding frequency conversion contactor and a meter counter forced emergency stop output I/O, which is not limited by the length of a meter for the sake of time and demand. Wherein: d350, D400, D410, D500 and D510 are HMI touch screen numerical value input elements, and numerical values can be edited and modified according to actual conditions; the average command AVG is a geometric average that makes the output analog more linear, unlike the arithmetic average in the PLC settings.

Referring to fig. 5, the constant torque winding working principle is as follows: the winding tension is in a winding diameter control mode, and the tension is controlled to decrease progressively by increasing the winding diameter. The winding roller 22 triggers a rising edge pulse of the proximity switch 0.03 every 1 cycle, and a BCD code increment instruction is registered in D600, namely the number of revolutions of the winding shaft. The D600 and the winding tension set value D610 are processed by PID instruction operation to obtain a winding tension control value D620, the D620 is processed by an average value instruction for D630 times to obtain a control analog quantity with good linearity, and the control analog quantity is output by an address 201 of an analog quantity output module to control a frequency converter or (and) a meter counter of the winding roller 22 (see figure 2). Meanwhile, in order to prevent extreme tension, the output I/O address 100.04 of the winding magnetic powder clutch is controlled to output 1 only when the lower limit value D640 of the winding tension is not less than the actual value D660 of the winding tension is not less than the upper limit value D650 of the winding tension and the actual measurement length D500 of the meter counter is not more than the set length D510 of the meter counter. 100.05 is a winding frequency conversion contactor and a meter forced emergency stop output I/O, which is not limited by the length of a meter for the time to day. Wherein: d610, D630, D640 and D650 are HMI touch screen numerical value input elements, and numerical values can be edited and modified according to actual conditions.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.