PVC film blowing mechanism

Abstract

The utility model relates to the technical field of film blowing mechanisms, and discloses a PVC film blowing mechanism which comprises an outer lining and an air pipe, a cover plate is arranged at the top of the outer lining, an air guide pipe is arranged in the center of the bottom of the cover plate, a fixing column is arranged at the bottom of the cover plate, an inner lining is arranged at the bottom of the fixing column and located on the outer side of the air guide pipe, and the air pipe is connected with the inner lining. A first channel is formed between the inner wall of the neck bush and the outer wall of the air guide pipe, a second channel is formed between the outer wall of the neck bush and the inner wall of the outer bush, and a sealing ring is arranged at the top of the second channel. Due to the fact that the diameters of the first channel and the second channel are different, different channels are selected, and the diameters of formed cylindrical films are different after film blowing, so that film blowing of PVC films with different widths is achieved, a film blowing mechanism does not need to be replaced, and the film blowing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of film blowing mechanisms, in particular to a PVC film blowing mechanism. Background Art

[0002] The PVC film blowing mechanism is a mechanism used to heat and melt PVC plastic particles and then blow them into a film. The PVC plastic is added to the extruder and melted, then extruded from the annular gap of the front end die into a round tube shape. Compressed air is introduced through the center hole of the core rod of the die head to blow the cylinder into a bubble tube shape. At this time, the bubble tube is elongated both vertically and horizontally to obtain a certain inflation multiple. It is cooled by the outer air ring and then enters the guide splint and traction roller to flatten the bubble tube to prevent air leakage in the bubble tube to maintain the required constant blowing pressure. The flattened bubble tube becomes a flat-folded double-layer film and finally enters the take-up device for winding.

[0003] The existing Chinese patent (CN212097509U) discloses a PVC film blowing mechanism, including a PVC film blowing mechanism, a nozzle, a liner pipe, a connecting material pipe, a film blowing channel, a high-pressure air pump, an air guide pipe, a support frame, a support pipe, a protective sleeve, a nozzle, a threaded connection port, a rib, and a discharge hole. The PVC film blowing mechanism is provided with a nozzle, a film blowing channel is provided on the outside of the nozzle, and the top of the film blowing channel is connected to the high-pressure air pump through the air guide pipe. A support pipe is provided directly below the nozzle, and a protective sleeve is provided on the outside of the support pipe. The protective sleeve is installed on the outside of the support pipe to protect and cool the blown PVC mold to avoid dust contamination. The device has a reasonable design, a simple structure, high film blowing efficiency, and effectively prevents dust and incompletely solidified film from solidifying.

[0004] The above technical solutions and the PVC film blowing mechanisms in the prior art are often only applicable to PVC film blowing with a certain width range. When the production width of the PVC film needs to be changed, the film blowing gas pressure needs to be adjusted. However, the adjustment range of the film blowing pressure adjustment width is limited. For adjustment of PVC film with a larger width range, the corresponding film blowing mechanism needs to be replaced, which affects the film blowing efficiency of the PVC film. Utility Model Content

[0005] The purpose of the present invention is to provide a PVC film blowing mechanism to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a PVC film blowing mechanism, comprising an outer sleeve and an air pipe, a cover plate is provided on the top of the outer sleeve, an air pipe is provided in the center of the top of the cover plate, a feed cavity is opened on the top of the outer sleeve, a feed pipe is provided on one side of the feed cavity, an air duct is provided in the center of the bottom of the cover plate, a fixing column is provided at the bottom of the cover plate, an inner sleeve is provided at the bottom of the fixing column, the inner sleeve is located on the outside of the air duct, a first channel is formed between the inner wall of the inner sleeve and the outer wall of the air duct, a second channel is formed between the outer wall of the inner sleeve and the inner wall of the outer sleeve, and a sealing ring is provided on the top of the second channel.

[0007] Furthermore, an annular baffle is provided on the top of the inner sleeve for sliding close to one side of the first channel, a guide column is provided at the bottom of the annular baffle, a guide hole is provided inside the inner sleeve on the outside of the guide column, a lifting rod is provided on the top of the annular baffle, a lifting plate is provided on the top of the lifting rod, an electric hydraulic cylinder is provided on the top of the cover plate below the lifting plate, and the top of the electric hydraulic cylinder is fixed to the bottom of the lifting plate.

[0008] Furthermore, a connecting plate is provided on the top of the sealing ring, one end of the connecting plate is fixed to the annular baffle, there are multiple connecting plates, and the multiple connecting plates are evenly arranged circumferentially on the outside of the annular baffle.

[0009] Furthermore, a protective cover is provided on the top of the cover plate and located outside the lifting rod.

[0010] Furthermore, there are four fixing columns, and the four fixing columns are evenly arranged circumferentially on the top of the inner sleeve.

[0011] Furthermore, there are eight guide posts, which are evenly arranged circumferentially on the outside of the annular baffle; there are four lifting rods, which are evenly arranged circumferentially above the annular baffle.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The utility model realizes that when the PVC film blowing mechanism is used, the extruder feeds the molten PVC raw material into the feed chamber through the feed pipe, and passes through the first channel and the second channel provided at the bottom of the feed chamber. When blowing, one of the channels can be selected to be blocked, and the molten PVC raw material will flow out into a cylindrical film through the other channel. The cylindrical film is blown into a bubble tube shape by the air pipe and the air guide pipe in combination with compressed air, thereby realizing the PVC film blowing process. Since the diameters of the first channel and the second channel are different, different channels are selected, and after blowing, the diameters of the cylindrical films formed are also different, thereby realizing the blowing of PVC films in different width ranges, without replacing the film blowing mechanism, and improving the efficiency of film blowing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a three-dimensional diagram of a PVC film blowing mechanism of the utility model;

[0015] Figure 2 This is a main sectional view of a PVC film blowing mechanism of the utility model;

[0016] Figure 3 for Figure 2 A in the middle is an enlarged structural diagram;

[0017] Figure 4 This is a schematic diagram of the annular baffle connection structure of a PVC film blowing mechanism of the present utility model.

[0018] In the figure: 1. Outer sleeve; 2. Cover plate; 3. Protective sleeve; 4. Air pipe; 5. Electric hydraulic cylinder; 6. Lifting rod; 7. Lifting plate; 8. Feed pipe; 9. Fixed column; 10. Inner sleeve; 11. Air guide duct; 12. First channel; 13. Second channel; 14. Guide column; 15. Annular baffle; 16. Sealing ring; 17. Connecting plate; 18. Feed chamber. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] See also Figures 1-4 The utility model provides a technical solution: a PVC film blowing mechanism, comprising an outer sleeve 1 and an air pipe 4, a cover plate 2 is provided on the top of the outer sleeve 1, an air pipe 4 is provided in the center of the top of the cover plate 2, a feed cavity 18 is opened on the top of the outer sleeve 1, a feed pipe 8 is provided on one side of the feed cavity 18, an air duct 11 is provided in the center of the bottom of the cover plate 2, a fixing column 9 is provided at the bottom of the cover plate 2, an inner sleeve 10 is provided at the bottom of the fixing column 9, the inner sleeve 10 is located outside the air duct 11, a first channel 12 is formed between the inner wall of the inner sleeve 10 and the outer wall of the air duct 11, a second channel 13 is formed between the outer wall of the inner sleeve 10 and the inner wall of the outer sleeve 1, and a sealing ring 16 is provided at the top of the second channel 13. Through the first channel 12 and the second channel 13 provided at the bottom of the feed chamber, one of the channels can be selected to be blocked during blow molding, and the molten PVC raw material will flow out through the other channel to form a cylindrical film. The cylindrical film is blown into a bubble tube shape by the air pipe 4 and the air duct 11 in combination with compressed air, thereby realizing the film blowing process of the PVC film. Since the diameters of the first channel 12 and the second channel 13 are different, different channels are selected, and after film blowing, the diameters of the cylindrical films formed are also different, thereby realizing the blowing of PVC films of different widths without replacing the film blowing mechanism, thereby improving the efficiency of film blowing.

[0021] An annular baffle 15 is slidingly provided on the top of the inner sleeve 10 near the side of the first channel 12, and a guide column 14 is provided at the bottom of the annular baffle 15. A guide hole is opened inside the inner sleeve 10 on the outside of the guide column 14, and a lifting rod 6 is provided on the top of the annular baffle 15. A lifting plate 7 is provided on the top of the lifting rod 6. An electric hydraulic cylinder 5 is provided on the top of the cover plate 2 below the lifting plate 7, and the top of the electric hydraulic cylinder 5 is fixed to the bottom of the lifting plate 7.

[0022] When the molten PVC material enters the feed cavity 18, when a wider PVC film is required, the second channel 13 is selected as the film outlet channel for the blown film, and when a smaller PVC film is required, the first channel 12 is selected as the film outlet channel for the blown film.

[0023] When the second channel 13 is selected as the film outlet channel for film blowing, the lifting plate 7 is driven to rise by the electric hydraulic cylinder 5, thereby driving the lifting rod 6 to rise, and the annular baffle 15 will also rise together until the top of the annular baffle 15 abuts and seals with the bottom of the cover plate 2. At this time, the bottom of the annular baffle 15 is not separated from the inner sleeve 10, and the guide column 14 is still located in the guide hole. At this time, the outer side of the first channel 12 is sealed by the annular baffle 15, and the sealing ring 16 and the annular baffle 15 are fixedly connected by the connecting plate 17. They will also rise together, and the sealing ring 16 will be separated from the second channel 13. The top of the second channel 13 is in an open state, and the molten PVC material will not flow into the first channel 12, but can only enter the second channel 13 to cooperate with the air pipe 4 and the air guide pipe 11 to blow and form a film;

[0024] When the first channel is selected as the film outlet channel for blown film, the electric hydraulic cylinder 5 drives the lifting plate 7 to descend, thereby driving the lifting rod 6, the annular baffle 15, the connecting plate 17 and the sealing ring 16 to descend together. The sealing ring 16 seals the second channel 13, and the molten PVC material will flow into the first channel 12 through the gap between the top of the annular baffle 15 and the cover plate 2, and cooperate with the air pipe 4 and the air guide pipe 11 to blow air into the film.

[0025] The switching between the first channel 12 and the second channel 13 is achieved above, and the width of the blown film can be adjusted without replacing the film blowing mechanism.

[0026] A connecting plate 17 is provided at the top of the sealing ring 16, one end of which is fixed to the annular baffle 15. There are multiple connecting plates 17, which are evenly arranged circumferentially around the outside of the annular baffle 15. The connecting plates 17 secure the sealing ring 16 to the annular baffle 15, and when the annular baffle 15 is raised or lowered, the sealing ring 16 is also raised or lowered synchronously.

[0027] A protective sleeve 3 is provided on the top of the cover plate 2 and located outside the lifting rod 6 to protect the lifting rod 6 and the air pipe 4.

[0028] There are four fixing columns 9, which are evenly arranged circumferentially on the top of the inner sleeve 10. The even arrangement of the fixing columns 9 improves the stability of the installation of the inner sleeve 10, and does not affect the movement of the molten PVC material in the feed cavity 18.

[0029] There are eight guide posts 14, which are evenly arranged circumferentially outside the annular baffle 15. There are four lifting rods 6, which are evenly arranged circumferentially above the annular baffle 15. The multiple settings of the guide posts 14 and lifting rods 6 can improve the stability of the annular baffle 15 during lifting.

[0030] When the PVC film blowing mechanism is in use, the extruder feeds the molten PVC raw material into the feed chamber 18 through the feed pipe 8. Through the first channel 12 and the second channel 13 set at the bottom of the feed chamber, one of the channels can be selected to be blocked during blow molding, and the molten PVC raw material will flow out through the other channel to form a cylindrical film. The cylindrical film is blown into a bubble tube shape through the air pipe 4 and the air duct 11 with compressed air, thereby realizing the PVC film blowing process. Since the diameters of the first channel 12 and the second channel 13 are different, different channels are selected. After blowing the film, the diameter of the cylindrical film formed is also different, thereby realizing PVC film blowing in different width ranges without replacing the film blowing mechanism, thereby improving the efficiency of film blowing.

[0031] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A PVC film blowing mechanism, comprising an outer sleeve (1) and an air pipe (4), characterized in that: The outer sleeve (1) is provided with a cover plate (2) at the top, an air pipe (4) is provided at the center of the top of the cover plate (2), a feed cavity (18) is opened at the top of the outer sleeve (1), a feed pipe (8) is provided on one side of the feed cavity (18), an air duct (11) is provided at the center of the bottom of the cover plate (2), a fixing column (9) is provided at the bottom of the cover plate (2), an inner sleeve (10) is provided at the bottom of the fixing column (9), the inner sleeve (10) is located outside the air duct (11), a first channel (12) is formed between the inner wall of the inner sleeve (10) and the outer wall of the air duct (11), a second channel (13) is formed between the outer wall of the inner sleeve (10) and the inner wall of the outer sleeve (1), and a sealing ring (16) is provided at the top of the second channel (13).

2. A PVC film blowing mechanism according to claim 1, characterized in that: An annular baffle (15) is slidably provided on the top of the inner sleeve (10) near one side of the first channel (12), a guide column (14) is provided at the bottom of the annular baffle (15), a guide hole is provided inside the inner sleeve (10) and located outside the guide column (14), a lifting rod (6) is provided on the top of the annular baffle (15), a lifting plate (7) is provided on the top of the lifting rod (6), an electric hydraulic cylinder (5) is provided on the top of the cover plate (2) and located below the lifting plate (7), and the top of the electric hydraulic cylinder (5) is fixed to the bottom of the lifting plate (7).

3. A PVC film blowing mechanism according to claim 2, characterized in that: A connecting plate (17) is provided on the top of the sealing ring (16), one end of the connecting plate (17) is fixed to the annular baffle (15), and there are multiple connecting plates (17), which are evenly arranged in the circumferential direction outside the annular baffle (15).

4. A PVC film blowing mechanism according to claim 1, characterized in that: A protective sleeve (3) is provided on the top of the cover plate (2) and located outside the lifting rod (6).

5. A PVC film blowing mechanism according to claim 1, characterized in that: There are four fixing columns (9), and the four fixing columns (9) are evenly arranged in the circumferential direction on the top of the inner sleeve (10).

6. A PVC film blowing mechanism according to claim 2, characterized in that: There are eight guide posts (14), and the eight guide posts (14) are evenly arranged circumferentially outside the annular baffle (15); there are four lifting rods (6), and the four lifting rods (6) are evenly arranged circumferentially above the annular baffle (15).

Images