CN113816220A - Tension precise control device and control method suitable for automatic paving and winding all-in-one machine - Google Patents
Tension precise control device and control method suitable for automatic paving and winding all-in-one machine Download PDFInfo
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- CN113816220A CN113816220A CN202111177310.7A CN202111177310A CN113816220A CN 113816220 A CN113816220 A CN 113816220A CN 202111177310 A CN202111177310 A CN 202111177310A CN 113816220 A CN113816220 A CN 113816220A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
- B65H59/02—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating delivery of material from supply package
- B65H59/06—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating delivery of material from supply package by devices acting on material leaving the package
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H16/00—Unwinding, paying-out webs
- B65H16/02—Supporting web roll
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/26—Registering, tensioning, smoothing or guiding webs longitudinally by transverse stationary or adjustable bars or rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H43/00—Use of control, checking, or safety devices, e.g. automatic devices comprising an element for sensing a variable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H49/00—Unwinding or paying-out filamentary material; Supporting, storing or transporting packages from which filamentary material is to be withdrawn or paid-out
- B65H49/18—Methods or apparatus in which packages rotate
- B65H49/20—Package-supporting devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H57/00—Guides for filamentary materials; Supports therefor
- B65H57/14—Pulleys, rollers, or rotary bars
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Abstract
The invention provides a tension precise control device suitable for an automatic spreading and winding integrated machine, which comprises a high-tension lifting roller, a high-tension lifting cylinder, a roller, a low-tension deflection roller, a low-tension side plate, a low-tension deflection cylinder, a yarn guide roller and a spreading and winding machine main body, wherein the high-tension lifting roller is arranged on the high-tension lifting cylinder; the large-tension lifting roller, the yarn passing roller and the yarn guide roller are sequentially arranged from high to low, large-tension lifting cylinders are arranged below two ends of the large-tension lifting roller, the large-tension lifting cylinders are fixed on the main body of the spreading and winding machine, and the extending ends of piston rods are connected with the end parts of the large-tension lifting roller; the small-tension deflection cylinder is fixed on the large-tension lifting cylinder; the rotating end of the small-tension deflection air cylinder is connected with a small-tension side plate; two ends of the small-tension deflection roller are connected with a group of small-tension side plates, and two ends of the over roller and the yarn guide roller are connected to the main body of the spreading and winding machine. The automatic belt laying and winding machine disclosed by the invention is combined with automatic belt laying and winding, the large tension control corresponds to automatic winding, the small tension control corresponds to automatic laying, the large-range precise and controllable tension is realized, and the work is stable.
Description
Technical Field
The invention relates to the technical field of automatic laying and winding molding of composite materials, in particular to a tension precise control device and a tension precise control method suitable for an automatic laying and winding all-in-one machine.
Background
With the progress of science and technology of human society in recent years, composite materials are gradually installed in the center of stages of industrial manufacture, particularly in the fields of aviation, military industry and the like. The automatic manufacturing technology replaces manual manufacturing year by year, so that the cost is reduced, and the efficiency and the product quality are improved. Combining the two together results in an automated composite molding technique.
The automatic tape laying and winding technology is the key point of the existing automatic molding of composite materials, relates to the technical fields of the molding of airplane bodies, the automatic molding of shells such as missiles and the like, has the research directions of a prepreg tape yarn guide and shearing technology, a CAD/CAM technology, a pressure control technology, a tension control technology and the like, and is particularly suitable for the molding and manufacturing of complex components.
At present, the automatic laying technology is suitable for forming components with large curvature change and negative curvature concave surfaces, and the automatic winding technology is more suitable for components with small curvature change, such as cylinders. And in order to meet the requirements of 20-150mm of prepreg tapes with different widths, the width of the tape material is greatly changed, so that the stability of laying tension of the prepreg tape laying head is required to be better controlled in a wider range.
Disclosure of Invention
In order to solve the problems, the invention discloses a tension precise control device and a control method suitable for an automatic paving and winding integrated machine; the scheme of combining a large tension control mode and a small tension control mode can meet the tension control of automatic winding during 20-150mm of pre-impregnated cloth belts with different widths, and 10-100N adjustable and stable work is achieved. The large tension control mode is used for automatic winding, the small tension control mode is used for automatic tape laying, the large tension control mode and the small tension control mode are combined together, automatic winding and automatic tape laying can be freely switched, and tension can be stably regulated and controlled.
The invention adopts the following technical scheme to achieve the aim:
the tension precise control device suitable for the automatic paving and winding integrated machine comprises a large-tension lifting roller, a large-tension lifting cylinder, a roller, a small-tension deflection roller, a small-tension side plate, a small-tension deflection cylinder, a yarn guide roller and a paving and winding machine main body; the large-tension lifting roller, the yarn passing roller and the yarn guide roller are sequentially arranged from high to low, large-tension lifting cylinders are arranged below two ends of the large-tension lifting roller, the large-tension lifting cylinders are fixed on the main body of the spreading and winding machine, and the extending ends of piston rods are connected with the end parts of the large-tension lifting roller; the small-tension deflection cylinder is fixed on the large-tension lifting cylinder; the rotating end of the small-tension deflection air cylinder is connected with a small-tension side plate; two ends of the small-tension deflection roller are connected with a group of small-tension side plates, and two ends of the over roller and the yarn guide roller are connected to the main body of the spreading and winding machine.
The tension precise control method is suitable for the automatic paving and winding all-in-one machine, the tension precise device of the automatic paving and winding all-in-one machine is used for controlling large/small tension, the large tension is used for automatic winding, and the control method comprises the following steps:
step 1.1: the pay-off shaft of the tape laying machine main body moves in a torque mode through a servo motor, and the paid-off tape is separated from a release film after being separated by a material film separation shaft, enters the upper part of a high-tension lifting roller, passes through the lower part of the roller after bypassing the high-tension lifting roller, and is guided out to a compression roller at the front end of the tape laying head main body through the lower part of a yarn guide roller to finish threading;
step 1.2, installing an ultrasonic diameter measuring probe above the discharging shaft; the outer diameter of the belt material of the discharging shaft is measured through an ultrasonic diameter measuring sensor, the required tension is written into a PLC with a display screen through a touch screen, and the moment of the discharging shaft of the main body of the belt paving machine is adjusted by the PLC with the display screen in real time according to the tension and the outer diameter, so that the tension of the end of the discharging shaft is stable;
step 1.3, adjusting the pressure intensity of a high-tension lifting cylinder through an electric proportional valve to adjust the piston thrust of a high-tension lifting roller, namely the belt tension in the high-tension winding process; the tension fluctuation caused by speed change, concave-convex of the die and other reasons is compensated by the up-and-down floating of the large-tension lifting roller;
wherein the small tension control is used for automatic tape laying and the control method is as follows:
step 2.1, the discharging shaft of the tape laying machine main body moves in a speed mode through a servo motor, discharged tape materials are separated from a release film after being separated by a material film separation shaft, enter the upper part of a high-tension lifting roller, pass through the lower part of the roller after bypassing the high-tension lifting roller, then pass through the upper part of a small-tension deflection roller upwards, and then are led out to a pressing roller at the front end of the tape laying head main body after passing through the lower part of a yarn guide roller downwards, so that yarn threading is completed;
step 2.2, reading the deflection angle of the small-tension deflection cylinder through a PLC (programmable logic controller) with a display screen, calculating the speed required by the current discharging shaft, and outputting the speed to the discharging shaft, wherein when the deflection angle of the small-tension deflection cylinder is kept in the middle, the speed of the discharging shaft is 0, when the deflection angle of the small-tension deflection cylinder is too small, the tension is too large, the speed of the discharging shaft is positive, the deflection angle is smaller, the positive speed is higher, when the deflection angle of the small-tension deflection cylinder is too large, the tension is too small, the speed of the discharging shaft is negative, the deflection angle is larger, and the negative speed is higher;
2.3, adjusting the pressure of the small-tension deflection cylinder through a pressure adjusting valve, and further adjusting the deflection force of the small-tension deflection cylinder to adjust the tension of the belt material in the small-tension laying process; the fluctuation of the tension caused by speed change, concave-convex of the die and the like is compensated by the back-and-forth swing of the small tension deflection roller.
Furthermore, the large tension control value is set through a touch screen of a PLC (programmable logic controller) with a display screen, and the tension is regulated and controlled through calculation of the PLC with the display screen.
Further, the small tension control is controlled by a pressure regulating valve knob.
Furthermore, a large-tension lifting cylinder and a small-tension deflection cylinder are single-action cylinders.
Further, the material-membrane separation shaft realizes material-membrane separation, the belt material upwards enters a high-tension lifting roller, and the release film leftwards enters a film collecting shaft.
The invention has the beneficial effects that:
automatic tape laying and automatic winding are combined, large tension control corresponds to automatic winding, small tension control corresponds to automatic laying, large-range tension precision control is achieved, and the working is stable.
Drawings
FIG. 1 is a schematic structural diagram of a tension precise control device of an automatic paving and winding integrated machine;
FIG. 2 is a drawing of a high tension control threading;
FIG. 3 is a drawing of a small tension control threading;
list of reference numbers:
1-discharging shaft, 2-material-film separating shaft, 3-film collecting shaft, 4-high tension lifting roller, 5-high tension lifting cylinder, 6-passing roller, 7-low tension deflection roller, 8-low tension deflection cylinder, 9-yarn guide roller, 10-low tension side plate and 11-laying-winding machine main body.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1, the tension precise control device suitable for the automatic winding and paving integrated machine of the embodiment comprises a high-tension lifting roller 4, a high-tension lifting cylinder 5, a roller 6, a low-tension deflection roller 7, a low-tension side plate 10, a low-tension deflection cylinder 8, a yarn guide roller 9 and a winding and paving machine body 11; the high-tension lifting roller 4, the over roller 6 and the yarn guide roller 9 are sequentially arranged from high to low, the high-tension lifting cylinders 5 are arranged below two ends of the high-tension lifting roller 4, the high-tension lifting cylinders 5 are fixed on the lapping and winding machine main body 11, and the extending ends of piston rods are connected with the end parts of the high-tension lifting roller 4; the small-tension deflection cylinder 8 is fixed on the large-tension lifting cylinder 5; the rotating end of the small-tension deflection cylinder 8 is connected with a small-tension side plate 10; two ends of the small-tension deflection roller 7 are connected with a group of small-tension side plates 10, and two ends of the over roller 6 and the yarn guide roller 9 are connected to the winding machine body 11.
When the automatic winding forming with large tension is carried out, the threading mode as shown in figure 2 is adopted. The wrap angle of the prepreg tapes on the deflection roller is about 180 degrees, and the tension on the prepreg tapes is also constant. Neglecting tension fluctuations caused by wrap angle variations due to equilibrium position shifts. The actual output tension value is:
T=ω/r
where ω is the roll torque and r is the roll radius detected.
The large tension control mode corresponds to the working tension of 40-100N and the control method is as follows.
Firstly, the discharge shaft 1 of the tape laying machine main body moves in a torque mode, according to a graph 2, discharged tape materials are separated from a release film after being separated by the material film separation shaft 2, enter the upper part of the high-tension lifting roller 4, pass through the lower part of the roller 6 after bypassing the high-tension lifting roller 4, and then are guided out to the front end press roller of the tape laying head main body through the lower part of the yarn guide roller 9, and yarn threading is completed.
Secondly, the outer diameter of the discharging shaft belt material is measured through a diameter measuring sensor, the required tension is written into the PLC with the display screen through the touch screen, and the PLC with the display screen adjusts the torque of the main discharging shaft of the belt laying machine in real time according to the tension and the outer diameter, so that the tension stability of the end of the discharging shaft is realized.
And finally, adjusting the pressure of the high-tension lifting cylinder through an electric proportional valve to adjust the piston thrust of the high-tension lifting roller, namely the belt tension in the high-tension winding process. The fluctuation of the tension caused by the speed change, the concave-convex of the die and the like is compensated by the up-and-down floating of the large-tension lifting roller. The prepreg tape reaches a stable state under the combined action of the discharge shaft and the deflection of the small tension roller.
When the automatic tape laying forming with small tension is carried out, the threading mode as shown in figure 3 is adopted. The wrap angle of the prepreg tapes on the deflection roller is about 180 degrees, and the tension on the prepreg tapes is also constant. Neglecting tension fluctuations caused by wrap angle variations due to equilibrium position shifts. The actual output tension value is:
T=F/2
where F is the yaw force of the low tension yaw roller.
The small tension control mode corresponds to the working tension of 10-40N and the control method is as follows:
firstly, the discharging shaft 1 of the tape laying machine main body moves in a speed mode, according to a graph 3, discharged tape materials are separated from a release film after being separated by the material film separating shaft 2, enter the upper part of the high-tension lifting roller 4, pass through the lower part of the roller 6 downwards after bypassing the high-tension lifting roller 4, then pass through the upper part of the low-tension deflection roller 7 upwards, and then pass through the lower part of the yarn guide roller 9 downwards to be guided out to the front end pressing roller of the tape laying head main body, so that yarn threading is completed.
Secondly, reading the deflection angle of the small-tension deflection cylinder through a PLC (programmable logic controller) with a display screen, calculating the speed v required by the current discharging shaft, and outputting the speed v to the discharging shaft, wherein when the deflection angle theta of the small-tension deflection cylinder is kept in the middle, the speed of the discharging shaft is 0, when the deflection angle theta of the small-tension deflection cylinder is too small, the tension is over large, the speed of the discharging shaft is positive, the deflection angle is smaller, the positive speed is higher, when the deflection angle of the small-tension deflection cylinder is too large, the tension is over small, the speed of the discharging shaft is negative, the deflection angle is larger, and the negative speed is higher.
And finally, adjusting the pressure of the small-tension deflection cylinder through a pressure adjusting valve knob, and further adjusting the deflection force F of the small-tension deflection cylinder to adjust the tension of the belt material in the small-tension laying process. The fluctuation of the tension caused by speed change, concave-convex of the die and the like is compensated by the back-and-forth swing of the small tension deflection roller. The prepreg tape reaches a stable state under the combined action of the discharge shaft and the deflection of the small tension roller.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.
Claims (6)
1. Tension precise control device suitable for automatic shop twines all-in-one, its characterized in that: comprises a high-tension lifting roller (4), a high-tension lifting cylinder (5), a roller (6), a small-tension deflection roller (7), a small-tension side plate (10), a small-tension deflection cylinder (8), a yarn guide roller (9) and a spreading and winding machine main body (11); the high-tension lifting roller (4), the yarn passing roller (6) and the yarn guide roller (9) are sequentially arranged from high to low, high-tension lifting cylinders (5) are arranged below two ends of the high-tension lifting roller (4), the high-tension lifting cylinders (5) are fixed on a main body (11) of the lapping and winding machine, and the extending ends of piston rods are connected with the end portions of the high-tension lifting roller (4); the small-tension deflection cylinder (8) is fixed on the large-tension lifting cylinder (5); the rotating end of the small-tension deflection cylinder (8) is connected with a small-tension side plate (10); two ends of the small-tension deflection roller (7) are connected with a group of small-tension side plates (10), and two ends of the over roller (6) and the yarn guide roller (9) are connected to the main body (11) of the spreading and winding machine.
2. The precise tension control method suitable for the automatic paving and winding all-in-one machine as claimed in claim 1, characterized in that: the tension precision device of the automatic paving and winding integrated machine is utilized to control large/small tension, wherein the large tension is used for automatic winding, and the control method comprises the following steps:
step 1.1: the pay-off shaft (1) of the tape laying machine main body (11) moves in a torque mode through a servo motor, and the paid-off tape is separated from a release film after being separated by the material film separation shaft (2), enters the upper part of the high-tension lifting roller (4), bypasses the high-tension lifting roller (4), then passes through the lower part of the roller (6) downwards, and is led out to a front end pressure roller of the tape laying head main body (11) through the lower part of the yarn guide roller (9) to finish threading;
step 1.2, installing an ultrasonic diameter measuring probe above the discharging shaft (1); the outer diameter of the belt material of the discharging shaft is measured through an ultrasonic diameter measuring sensor, the required tension is written into a PLC with a display screen through a touch screen, and the moment of the discharging shaft of the main body of the belt paving machine is adjusted by the PLC with the display screen in real time according to the tension and the outer diameter, so that the tension of the end of the discharging shaft is stable;
step 1.3, adjusting the pressure intensity of a high-tension lifting cylinder (5) through an electric proportional valve to adjust the piston thrust of a high-tension lifting roller (4), namely the belt tension in the high-tension winding process; the tension fluctuation caused by speed change, concave-convex of the die and other reasons is compensated by the up-and-down floating of the high-tension lifting roller (4);
wherein the small tension control is used for automatic tape laying and the control method is as follows:
step 2.1, the discharging shaft (1) of the tape laying machine main body (11) moves in a speed mode through a servo motor, discharged tapes are separated from a release film after being separated by the material film separating shaft (2), enter the upper part of the high-tension lifting roller (4), pass through the lower part of the roller (6) downwards after bypassing the high-tension lifting roller (4), then pass through the upper part of the small-tension deflection roller (7) upwards, and then pass through the lower part of the yarn guide roller (9) downwards to be guided out to a pressing roller at the front end of the tape laying head main body, so that yarn threading is completed;
step 2.2, reading the deflection angle of the small-tension deflection cylinder through a PLC (programmable logic controller) with a display screen, calculating the speed required by the current discharging shaft, and outputting the speed to the discharging shaft, wherein when the deflection angle of the small-tension deflection cylinder is kept in the middle, the speed of the discharging shaft is 0, when the deflection angle of the small-tension deflection cylinder is too small, the tension is too large, the speed of the discharging shaft is positive, the deflection angle is smaller, the positive speed is higher, when the deflection angle of the small-tension deflection cylinder is too large, the tension is too small, the speed of the discharging shaft is negative, the deflection angle is larger, and the negative speed is higher;
2.3, adjusting the pressure of the small-tension deflection cylinder through a pressure adjusting valve, and further adjusting the deflection force of the small-tension deflection cylinder to adjust the tension of the belt material in the small-tension laying process; the fluctuation of the tension caused by speed change, concave-convex of the die and the like is compensated by the back-and-forth swing of the small tension deflection roller.
3. The precise tension control method suitable for the automatic paving and winding all-in-one machine as claimed in claim 1, characterized in that: the large tension control value is set through a PLC touch screen with a display screen, and the tension is regulated and controlled through calculation of the PLC with the display screen.
4. The precise tension control method suitable for the automatic paving and winding all-in-one machine as claimed in claim 1, characterized in that: wherein the small tension control is controlled by a pressure regulating valve knob.
5. The precise tension control method suitable for the automatic paving and winding all-in-one machine as claimed in claim 1, characterized in that: the large-tension lifting cylinder (5) and the small-tension deflection cylinder (4) are single-action cylinders.
6. The precise tension control method suitable for the automatic paving and winding all-in-one machine as claimed in claim 1, characterized in that: the material-membrane separation shaft (2) realizes material-membrane separation, the belt material upwards enters a high-tension lifting roller (4), and the release film leftwards enters a film collecting shaft (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111177310.7A CN113816220B (en) | 2021-10-09 | 2021-10-09 | Tension precise control device and control method suitable for automatic paving and winding integrated machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111177310.7A CN113816220B (en) | 2021-10-09 | 2021-10-09 | Tension precise control device and control method suitable for automatic paving and winding integrated machine |
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| CN113816220A true CN113816220A (en) | 2021-12-21 |
| CN113816220B CN113816220B (en) | 2022-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115072441A (en) * | 2022-07-22 | 2022-09-20 | 江苏弘奇金属科技有限公司 | PE winding film pre-tightening and automatic film collecting device |
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| CN204873085U (en) * | 2015-06-02 | 2015-12-16 | 湖州美新数码印花有限公司 | Stenter rolling tension adjusting device |
| CN105800384A (en) * | 2016-05-18 | 2016-07-27 | 北方工业大学 | Optical fiber winding machine dynamic tension multistage control device and method |
| CN210824655U (en) * | 2019-11-01 | 2020-06-23 | 西安交通大学 | Angle type tension control device for stable conveying of carbon fiber prepreg tape |
| CN211712270U (en) * | 2020-01-04 | 2020-10-20 | 周锦星 | Be used for tailoring pay-off |
| CN212712172U (en) * | 2020-06-24 | 2021-03-16 | 江苏恒神股份有限公司 | Pre-impregnated yarn winding tension mechanism and system |
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2021
- 2021-10-09 CN CN202111177310.7A patent/CN113816220B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09151032A (en) * | 1995-11-29 | 1997-06-10 | Yazaki Corp | Abnormal tension detecting device for electric wire |
| CN204873085U (en) * | 2015-06-02 | 2015-12-16 | 湖州美新数码印花有限公司 | Stenter rolling tension adjusting device |
| CN105800384A (en) * | 2016-05-18 | 2016-07-27 | 北方工业大学 | Optical fiber winding machine dynamic tension multistage control device and method |
| CN210824655U (en) * | 2019-11-01 | 2020-06-23 | 西安交通大学 | Angle type tension control device for stable conveying of carbon fiber prepreg tape |
| CN211712270U (en) * | 2020-01-04 | 2020-10-20 | 周锦星 | Be used for tailoring pay-off |
| CN212712172U (en) * | 2020-06-24 | 2021-03-16 | 江苏恒神股份有限公司 | Pre-impregnated yarn winding tension mechanism and system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115072441A (en) * | 2022-07-22 | 2022-09-20 | 江苏弘奇金属科技有限公司 | PE winding film pre-tightening and automatic film collecting device |
| CN115072441B (en) * | 2022-07-22 | 2022-10-25 | 江苏弘奇金属科技有限公司 | PE winding film pre-tightening and automatic film collecting device |
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| Publication number | Publication date |
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| CN113816220B (en) | 2022-07-15 |
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