Blow molding equipment and processing method for PE film production

Abstract

The present invention relates to a blow molding device and a processing method for producing PE films applied in the field of blown film equipment. By utilizing a swing frame and two tilted rollers, the worn rollers can be quickly switched, and the possibility of stopping for adjustment can be avoided, thereby ensuring the continuity of the blow molding process. In addition, during the blow molding process, a cleaning brush can clean dust from the surface of the rotating roller, thereby ensuring the quality of the film during processing. After the worn roller switches its position, the design of a No. 3 motor, a moving rack, a brush plate, a No. 1 motor, and a friction disk can be utilized to perform a circumferential surface repair treatment on the worn roller after switching the position, thereby facilitating waiting for subsequent continued use. In this way, the two rollers can be switched for use, thereby avoiding the need for replacement. Furthermore, when the thickness of the roller surface increases during subsequent repairs, resulting in adjustment of the tilt angle of the swing frame, an electric extension rod can be utilized to assist the friction disk in re-contacting frictionally with the shaft surface of the roller surface.

Description

Technical Field

[0001] The present invention relates to a blow molding device for producing PE films, and in particular to a blow molding device for producing PE films and a processing method thereof, which are applied in the field of blown film equipment. Background Art

[0002] PE film is a thermoplastic polymer formed by the polymerization of ethylene. This film is widely used in various fields due to its excellent mechanical strength, dielectric properties, moisture resistance, flexibility, and chemical stability even at low temperatures. However, during the blow molding process, roller surface wear is a common problem, which not only affects production efficiency but also may reduce product quality.

[0003] The specification of Chinese invention patent CN118372465A discloses an improved film blowing equipment and film blowing process. The improved film blowing equipment and film blowing process can limit and fix the roller between the front and rear mounting frames through the setting of transmission parts and plug-in parts, and by controlling the transmission of the chain, it is convenient for personnel to adjust the position of each roller according to the degree of wear of the roller, so that each roller is maximized, reducing economic costs, and also conveniently replacing each roller, avoiding the problem of increasing personnel workload due to overall replacement, thereby improving the production quality of the film.

[0004] Existing blow molding equipment replaces worn rollers through progressive exchange operations. However, during the exchange, the rollers and the film being blown need to be temporarily shut down, affecting processing efficiency. In addition, the number of replacement rollers is fixed and self-repair is impossible, which limits the continued use of the rollers. Summary of the Invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to achieve rapid replacement of worn rollers and self-repair of worn rollers during film blowing processing.

[0006] In order to solve the above problems, the present invention provides a blow molding device for producing PE film, comprising an extrusion tank for producing film, a feed hopper is installed through one side of the top of the extrusion tank, a blow molding die head is arranged on the side of the extrusion tank away from the feed hopper, and the blow molding die head is connected to the extrusion tank through a pipeline, an air cooling ring is installed on the top of the blow molding die head, a bracket is installed on the outside of the blow molding die head, two herringbone frames are symmetrically installed on the inside of the bracket, two tilted swing racks are symmetrically installed inside the herringbone frame through an axis, and the surfaces of the two swing racks in each herringbone frame close to each other are connected through an axis. The shaft is rotatably connected to a roller, a No. 2 motor is installed on the front of the herringbone frame, and the output end of the No. 2 motor is connected to the end of the shaft rod, a No. 3 motor is symmetrically installed on the top of the bracket, the output end of the No. 3 motor is connected to a gear, the surface of the gear is meshed and connected to a moving rack, the bottom end of the moving rack is connected to a brush plate with a cleaning sponge strip passing through the bottom, a No. 1 motor is installed on the front of the bracket, the output end of the No. 1 motor is connected to a rotating rod, and the surface of the rotating rod is fixedly sleeved with a friction disk located on the outside of the moving rack, and the surface of the friction disk is in friction contact with the surface of the shaft.

[0007] In the above-mentioned blow molding equipment for PE film production, the worn roller can be quickly switched, and the possibility of shutdown adjustment can be avoided, thereby ensuring the continuity of the blow molding process. After the worn roller switches its position, the worn roller can be subjected to a circular surface repair treatment.

[0008] As a further improvement of the present application, the top of the herringbone frame is fixedly connected to the inner wall surface of the bracket through a support rod, and liquid storage frames with built-in repair paint liquid are installed on both side surfaces of the bracket. A suction pump is installed on the top of each liquid storage frame, and the input and output ends of the suction pump are respectively connected to the interior of the liquid storage frame and the brush plate through a hose.

[0009] As a further improvement of the present application, a receiving tray is installed on the inner side of the bracket, and the receiving tray is located below the roller shaft at the lower position in the swing frame.

[0010] As a further improvement of the present application, a tilt sensor connected to the signal of motor No. 2 is installed on the surface of the shaft, and a cleaning brush strip with its tail end in contact with the surface of the roller is fixedly installed on the inner wall of the swing frame.

[0011] As a further improvement of the present application, in the initial state, the surface of the shaft inside the roller shaft near the lower end position on the inner side of the swing frame and the surface of the shaft inside the roller shaft near the upper end position on the inner side of the swing frame that is symmetrically arranged about the shaft rod are both in friction contact with the surface of the friction disk.

[0012] As a further improvement of the present application, a fiber optic spectrometer for measuring film thickness is installed above the bracket, and a blow molding auxiliary system is also included. The blow molding auxiliary system includes a filling and repair module and a switching module. The filling and repair module is connected to the No. 3 motor and the suction pump signal, and is used to repair the surface of the roller shaft on the inner side of the swing frame near the No. 1 motor position. The switching module is connected to the No. 2 motor and the fiber optic spectrometer signal, and is used to switch the worn roller shaft.

[0013] As another improvement of the present application, a circular groove is provided in the bracket, and the arc length of the circular groove is equal to half the circumference of the rotating rod. A support plate is installed on the front of the bracket, an electric extension rod is installed on the top of the support plate, and the output end of the electric extension rod is connected to the surface of motor No. 1, and motor No. 1 is in sliding contact with the surface of the support plate.

[0014] As another improved supplement of the present application, an ultrasonic thickness measuring sensor is installed inside the roller shaft, and the ultrasonic thickness measuring sensor is connected to the electric extension rod and the No. 1 motor signal.

[0015] As another improvement of the present application, a method for processing a blow molding device comprises the following steps:

[0016] S1, the raw material enters the extrusion tank through the feed hopper, and is then discharged through a pipeline to the blow molding die head for film blowing to obtain a film;

[0017] S2. When the roller for squeezing the film in the swing frame is worn, start the second motor to drive the roller in the swing frame to swing, so that the other roller in the swing frame is used to squeeze the film;

[0018] S3, then start the No. 3 motor to drive the moving rack to descend, indirectly driving the cleaning sponge strip at the bottom of the brush plate to contact the surface of the worn roller after the position is switched;

[0019] S4. Start the suction pump and motor No. 1 to drive the friction disk to rotate, and use the friction contact to rotate the shaft, thereby driving the worn roller to rotate and completing the circular repair.

[0020] In summary, the use of a swing frame and two tilted rollers can quickly achieve the switching of worn rollers. After the worn roller switches its position, the worn roller can be repaired in a circular manner on the surface, which is convenient for waiting for subsequent use. In this way, the two rollers can be switched and used, avoiding the need for replacement. In addition, when the thickness of the roller surface increases during subsequent repairs, causing the tilt angle of the swing frame to be adjusted, the electric extension rod can be used to assist the friction disk to regain friction contact with the shaft surface of the roller surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the inner structure of the bracket according to the first embodiment of the present application;

[0023] Figure 3 This is a schematic diagram of the installation of the rotating rod and the friction disc in the first embodiment of the present application;

[0024] Figure 4 Schematic diagram of the surface contact state between the friction disk and the shaft member of the roller surface in two different states according to the first embodiment of the present application;

[0025] Figure 5 This is a schematic diagram of the installation of the movable rack and the suction pump according to the first embodiment of the present application;

[0026] Figure 6 This is a schematic diagram of the roller switching state of the first embodiment of the present application;

[0027] Figure 7 For this application Figure 6 A is an enlarged schematic diagram;

[0028] Figure 8 This is a schematic diagram of the working state of the brush plate of the first embodiment of the present application;

[0029] Figure 9 This is a schematic diagram of the installation of an electric extension pole according to the second embodiment of the present application;

[0030] Figure 10 This is a schematic diagram of the state of the surface of the shaft member where the friction disk according to the second embodiment of the present application moves close to the roller shaft surface with increased thickness.

[0031] Description of the numbers in the figure:

[0032] 1. Extrusion tank; 2. Feed hopper; 3. Blow molding die head; 4. Air cooling ring; 5. Motor No. 1; 6. Liquid storage frame; 7. Motor No. 2; 8. Motor No. 3; 9. Moving rack; 10. Brush plate; 11. Herringbone frame; 12. Roller; 13. Suction pump; 14. Rotating rod; 15. Friction plate; 16. Receiver plate; 17. Swing frame; 18. Cleaning brush strip; 19. Electric extension rod; 001. Bracket. DETAILED DESCRIPTION

[0033] The following describes three implementation methods of the present application in detail with reference to the accompanying drawings.

[0034] The first implementation method:

[0035] Figure 1-3 and Figure 5A blow molding device for producing PE film is shown, comprising an extrusion tank 1 for producing film, a feed hopper 2 being installed through one side of the top of the extrusion tank 1, a blow molding die 3 being arranged on the side of the extrusion tank 1 facing away from the feed hopper 2, and the blow molding die 3 being connected to the extrusion tank 1 through a pipe, an air cooling ring 4 being installed on the top of the blow molding die 3, a bracket 001 being installed on the outside of the blow molding die 3, two herringbone frames 11 being symmetrically installed on the inside of the bracket 001, two tilted swing frames 17 being symmetrically installed inside the herringbone frame 11 through an axis, and the surfaces of the two swing frames 17 in each herringbone frame 11 being connected to each other by a shaft. There is a roller shaft 12, and the front of the herringbone frame 11 is equipped with a No. 2 motor 7, and the output end of the No. 2 motor 7 is connected to the end of the shaft rod. The top of the bracket 001 is symmetrically equipped with a No. 3 motor 8, and the output end of the No. 3 motor 8 is connected to a gear, and the surface of the gear is meshed and connected to a moving rack 9. The bottom end of the moving rack 9 is connected to a brush plate 10 with a cleaning sponge strip passing through the bottom. The front of the bracket 001 is equipped with a No. 1 motor 5, and the output end of the No. 1 motor 5 is connected to a rotating rod 14, and the surface of the rotating rod 14 is fixedly sleeved with a friction disk 15 located on the outside of the moving rack 9, and the surface of the friction disk 15 is in friction contact with the surface of the shaft.

[0036] Figure 4 It is shown that in the initial state, the surface of the shaft part inside the roller shaft 12 near the lower end position on the inner side of the swing frame 17 and the surface of the shaft part inside the roller shaft 12 near the upper end position on the inner side of the swing frame 17 that is symmetrically arranged about the shaft rod are both in friction contact with the surface of the friction disk 15.

[0037] Specifically, during the blow molding process, the film processing raw material enters the extrusion tank 1 through the feed hopper 2, and is subsequently discharged to the blow molding die 3 through the extrusion tank 1 (a spiral extrusion rod is installed in the extrusion tank 1, which is a prior art and not shown in the figure). The film is then blown out and passes through the extrusion limiter between the two rollers 12. When the film continues to rise and passes through the middle of the rollers 12, the friction drives the rollers 12 in contact with the film to rotate. The blown film is then wound up by a traction device.

[0038] When the film passes through the middle of the roller 12, it will rub against the surface of the roller 12, and then the surface of the roller 12 will be worn after long-term use. At this time, the thickness of the film becomes abnormal. At this time, the second motor 7 rotates, so that the swing frame 17 after rotation switching has the same and symmetrical tilt as the initial state, so that the other roller 12 in the swing frame 17 can quickly squeeze and contact with the surface of the film, which can achieve rapid switching of the roller 12 while avoiding shutdown adjustments, ensuring the continuity of the film blowing process (such as Figure 6 shown);

[0039] In this application, Figure 8As shown, taking the roller 12 that is initially in contact with the film at the top as an example, when the other roller 12 (that is, the lower roller 12) is switched to be in contact with the film, the upper roller 12 moves to the bottom of the brush plate 10. At this time, the No. 3 motor 8 is started, driving the gear to rotate, thereby driving the moving rack 9 and the bottom brush plate 10 to move downward until the cleaning sponge strip at the bottom of the brush plate 10 contacts the surface of the upper roller 12. Then, the No. 3 motor 8 stops rotating, and then the suction pump 13 and the No. 1 motor 5 are started, and the suction pump 13 is started. The repair paint liquid in the liquid storage frame 6 can be transported to the brush plate 10, and the surface of the upper roller 12 can be repaired by a cleaning sponge strip that passes through the brush plate 10 (the wear on the surface of the upper roller 12 is filled and repaired by painting). At the same time, the No. 1 motor 5 drives the rotating rod 14 and the friction disk 15 on the surface to rotate. Since the friction disk 15 and the surface of the shaft connected to the upper roller 12 after the switching position are in friction contact, the friction disk 15 can drive the upper roller 12 to rotate when it rotates, thereby realizing a circular repair and filling process.

[0040] The top of the herringbone frame 11 is fixedly connected to the inner wall surface of the bracket 001 through a support rod. The side surfaces of both sides of the bracket 001 are installed with a liquid storage frame 6 with built-in repair paint liquid. A suction pump 13 is installed on the top of each liquid storage frame 6, and the input end and output end of the suction pump 13 are respectively connected to the interior of the liquid storage frame 6 and the brush plate 10 through a hose.

[0041] A receiving pan 16 is installed on the inner side of the bracket 001 , and the receiving pan 16 is located below the roller shaft 12 at the lower position in the swing frame 17 .

[0042] Specifically, the receiving pan 16 is used to receive excess repair paint liquid dripping during the repair and filling process of the roller shaft 12 .

[0043] Figure 7 As shown, the surface of the shaft is installed with an inclination sensor connected to the signal of the second motor 7, and the inner wall of the swing frame 17 is fixed with a cleaning brush strip 18 whose tail end is in contact with the surface of the roller shaft 12.

[0044] Specifically, the tilt sensor (not shown) is used to monitor the rotation amplitude of the second motor 7, and then control the degree of proximity between the two rollers 12 on the same horizontal line to meet the processing requirements of films of different thicknesses.

[0045] When the roller 12 rotates, it contacts the cleaning brush 18 , which can clean the surface of the roller 12 and prevent dust from affecting the processing quality of the film.

[0046] A fiber optic spectrometer for measuring film thickness is installed above the bracket 001, and it also includes a blow molding auxiliary system. The blow molding auxiliary system includes a filling and repair module and a switching module. The filling and repair module is connected to the signal of motor No. 3 8 and suction pump 13, and is used to repair the surface of the roller 12 on the inner side of the swing frame 17 near the position of motor No. 1 5. The switching module is connected to the signal of motor No. 2 7 and the fiber optic spectrometer, and is used to switch the worn roller 12.

[0047] Specifically, the fiber optic spectrometer is a prior art and will not be described in detail. It is not shown in this application and is mainly used to detect whether there is an abnormality in the thickness of a thin film.

[0048] The second implementation method:

[0049] Figure 9 It is shown that a circular groove is provided in the bracket 001, and the arc length of the circular groove is equal to half the circumference of the rotating rod 14. A support plate is installed on the front of the bracket 001, and an electric extension rod 19 is installed on the top of the support plate. The output end of the electric extension rod 19 is connected to the surface of the No. 1 motor 5, and the No. 1 motor 5 is in sliding contact with the surface of the support plate.

[0050] An ultrasonic thickness measuring sensor is installed inside the roller shaft 12, and the ultrasonic thickness measuring sensor is connected to the electric extension rod 19 and the No. 1 motor 5 for signal.

[0051] Figure 10 It is shown that, different from the first embodiment, this embodiment mainly targets the case where the thickness of the roller 12 surface increases after multiple repairs in the first embodiment. At this time, in order to achieve the same extrusion contact effect as in the initial state, the swing angle of the swing frame 17 is reduced, which will drive the roller 12 closer to the direction of the herringbone frame 11, thereby destroying the contact state between the friction disc 15 and the shaft.

[0052] Specifically, in order to improve the above phenomenon, during the repair process, an ultrasonic thickness sensor can be used to detect whether the thickness of the repair paint liquid on the surface of the roller 12 exceeds the initial state (assuming that the initial thickness of the roller 12 is R, and the thickness increases to R1 after repair, and R1 is greater than R, that is, the inclination of the swing frame 17 needs to be adjusted). At this time, based on the difference between R and R1, the horizontal displacement of the roller 12 caused by the adjustment of the inclination of the swing frame 17 is calculated, and then the displacement data is sent to the electric extension rod 19, and the electric extension rod 19 is used to push the No. 1 motor 5 and the friction disk 15 (because the contact part of the rotating rod 14 and the bracket 001 is half, it will not interfere with the departure and return movement of the rotating rod 14) to displace, so that the friction disk 15 is in friction contact with the shaft on the surface of the roller 12 again.

[0053] In this embodiment, the thickness of the surface repair of the upper and lower rollers 12 is kept consistent, thereby ensuring that the friction disk 15 can maintain effective friction contact with any one of the two rollers 12 when the electric extension rod 19 moves subsequently.

[0054] The third implementation method:

[0055] A method for processing a blow molding device comprises the following steps:

[0056] S1, the raw material enters the extrusion tank 1 through the feed hopper 2, and is then discharged through a pipeline to the blow molding die 3 for film blowing to obtain a film;

[0057] S2. When the roller 12 for squeezing the film in the swing frame 17 is worn, the second motor 7 is started to drive the roller 12 in the swing frame 17 to swing, so that the other roller 12 in the swing frame 17 is used to squeeze the film;

[0058] S3, then start the third motor 8, drive the movable rack 9 to descend, and indirectly drive the cleaning sponge strip at the bottom of the brush plate 10 to contact the surface of the roller shaft 12 in a worn state after the position is switched;

[0059] S4. Start the suction pump 13 and the first motor 5 to drive the friction disk 15 to rotate. The shaft rotates by means of friction contact, thereby driving the worn roller 12 to rotate, completing the circular repair.

[0060] In summary, the present application utilizes the swing frame 17 and the two tilted rollers 12 to quickly realize the switching of the worn roller 12, avoid the possibility of shutdown adjustment, and ensure the continuity of the blow molding process. In addition, during the blow molding process, the cleaning brush bar 18 can clean the dust on the surface of the rotating roller 12, ensuring the quality of the film processing process. After the worn roller 12 switches its position, the design of the No. 3 motor 8 and the moving rack 9, the brush plate 10 and the No. 1 motor 5 and the friction disk 15 can be used to perform a circular surface repair treatment on the worn roller 12 after switching the position, which is convenient for waiting for subsequent continued use. In this way, the switching use of the two rollers 12 can be realized, avoiding the need for replacement, and when the surface thickness of the roller 12 increases during subsequent repairs, causing the tilt angle of the swing frame 17 to be adjusted, the electric extension rod 19 can be used to assist the friction disk 15 to regain friction contact with the shaft surface of the roller 12.

[0061] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A blow molding device for producing PE film, comprising an extrusion tank (1) for producing film, a feed hopper (2) is installed through one side of the top of the extrusion tank (1), a blow molding die (3) is arranged on the side of the extrusion tank (1) away from the feed hopper (2), and the blow molding die (3) is connected to the extrusion tank (1) through a pipeline, an air cooling ring (4) is installed on the top of the blow molding die (3), and a bracket (001) is installed on the outside of the blow molding die (3), characterized in that: Two herringbone frames (11) are symmetrically mounted on the inner side of the bracket (001); two tilted swing frames (17) are symmetrically mounted inside the herringbone frames (11) via shafts; surfaces of the two swing frames (17) in each herringbone frame (11) that are close to each other are rotatably connected to a roller shaft (12) via shafts; a No. 2 motor (7) is mounted on the front side of the herringbone frame (11); and an output end of the No. 2 motor (7) is connected to an end of the shaft; a No. 3 motor (8) is symmetrically mounted on the top of the bracket (001); The output end of the No. 3 motor (8) is connected to a gear, the surface of the gear is meshingly connected to a movable rack (9), the bottom end of the movable rack (9) is connected to a brush plate (10) having a cleaning sponge strip passing through the bottom, the front of the bracket (001) is equipped with a No. 1 motor (5), the output end of the No. 1 motor (5) is connected to a rotating rod (14), and the surface of the rotating rod (14) is fixedly sleeved with a friction disk (15) located outside the movable rack (9), and the surface of the friction disk (15) is in friction contact with the surface of the shaft; The top of the herringbone frame (11) is fixedly connected to the inner wall surface of the bracket (001) via a support rod, and liquid storage frames (6) with built-in repair paint liquid are installed on both side surfaces of the bracket (001), and a suction pump (13) is installed on the top of each liquid storage frame (6), and the input end and output end of the suction pump (13) are respectively connected to the inside of the liquid storage frame (6) and the brush plate (10) through a hose; The second motor (7) rotates while the roller shaft (12) is switched, so that the swing frame (17) after the rotation switch has the same inclination degree and is symmetrical with the initial state, so that the other roller shaft (12) in the swing frame (17) can quickly come into contact with the surface of the film by compression.

2. A PE film production blow molding device according to claim 1, characterized in that: A receiving plate (16) is installed on the inner side of the bracket (001), and the receiving plate (16) is located below the roller shaft (12) at a lower position in the swing frame (17).

3. A PE film production blow molding device according to claim 2, characterized in that: The surface of the shaft is provided with an inclination sensor connected to the signal of the second motor (7), and the inner wall of the swing frame (17) is fixedly provided with a cleaning brush strip (18) whose tail end is in contact with the surface of the roller shaft (12).

4. A PE film production blow molding device according to claim 3, characterized in that: In the initial state, the surface of the shaft member in the roller shaft (12) near the lower end position on the inner side of the swing frame (17) and the surface of the shaft member in the roller shaft (12) near the upper end position on the inner side of the swing frame (17) are both in friction contact with the surface of the friction disk (15).

5. A PE film production blow molding device according to claim 4, characterized in that: An optical fiber spectrometer for measuring film thickness is installed above the bracket (001), and a blow molding auxiliary system is also included. The blow molding auxiliary system includes a filling and repairing module and a switching module. The filling and repairing module is connected to the No. 3 motor (8) and the suction pump (13) by signal, and is used to repair the surface of the roller (12) on the inner side of the swing frame (17) near the No. 1 motor (5). The switching module is connected to the No. 2 motor (7) and the optical fiber spectrometer by signal, and is used to switch the worn roller (12).

6. A PE film production blow molding device according to claim 5, characterized in that: A circular groove is provided in the bracket (001), and the arc length of the circular groove is equal to half the circumference of the rotating rod (14). A support plate is installed on the front of the bracket (001), and an electric extension rod (19) is installed on the top of the support plate. The output end of the electric extension rod (19) is connected to the surface of the first motor (5), and the first motor (5) is in sliding contact with the surface of the support plate.

7. A PE film production blow molding device according to claim 6, characterized in that: An ultrasonic thickness measuring sensor is installed inside the roller shaft (12), and the ultrasonic thickness measuring sensor is connected to the electric extension rod (19) and the first motor (5) by signal.

8. A method for processing a blow molding device, using the blow molding device for producing a PE film according to claim 7, characterized in that: The following steps are involved: S1, the raw material enters the extrusion tank (1) through the feed hopper (2), and then is discharged to the blow molding die head (3) through a pipeline for film blowing to obtain a film; S2, when the roller (12) in the swing frame (17) for squeezing the film is worn, start the second motor (7) to drive the roller (12) in the swing frame (17) to swing, so that the other roller (12) in the swing frame (17) is used to squeeze the film; S3, then starting the third motor (8), driving the movable rack (9) to descend, and indirectly driving the cleaning sponge strip at the bottom of the brush plate (10) to contact the surface of the roller shaft (12) in a worn state after the position is switched; S4, start the suction pump (13) and the first motor (5), drive the friction disk (15) to rotate, and use the friction contact to make the shaft rotate, thereby driving the worn roller (12) to rotate, completing the circular repair.

Images