Film feeding device and film feeding method for glass fiber reinforced plastic continuous winding pipe production

Abstract

The invention relates to the technical field of glass fiber reinforced plastic pipe manufacturing, and provides a film feeding device and method for glass fiber reinforced plastic continuous winding pipe production. The film feeding device comprises a support, a driving assembly and a mold shaft, the mold shaft is rotationally arranged on the support and driven by the driving assembly to rotate, and a rotating disc is fixed to the mold shaft; the rotating disc and the die shaft rotate synchronously and are coaxial, a plurality of film guiding frames and unwinding frames are arranged on the rotating disc at equal arc intervals, the film guiding frames and the unwinding frames are arranged on the same radius straight line in a one-to-one correspondence and at intervals, the film guiding frames are arranged close to the circle center, film rolls are installed on the unwinding frames, and films are attached to the die shaft after being guided by the film guiding frames. The attaching direction of the films is parallel to the axis of the die shaft, the side edges of the multiple films are overlapped in a lap joint mode, a pay-off reel is further arranged on the support, a cotton thread reel is arranged on the pay-off reel, and cotton threads are bound to the outer sides of the films and wound around the outer sides of the films when rotating along with the die shaft. The film is attached linearly and wound by the cotton thread, so that the problem of difficult demolding or shutdown is effectively avoided.

Description

Technical Field

[0001] This application belongs to the technical field of fiberglass pipe manufacturing. More specifically, it relates to a film application device and a film application method for the production of continuous fiberglass wound pipes. Background Art

[0002] Fiberglass pipes are high-strength and corrosion-resistant non-metallic pipes. Their production process generally includes steps such as lining making, film application by winding, winding glass fibers with resin, light curing, heat curing, and cutting.

[0003] Among them, for film application by winding, a layer of PET film is spirally wound around a mold shaft, and a transparent tape is wound at the overlapping joint of the PET film to bond two turns of the film together. The purpose is to prevent resin from entering the mold shaft and facilitate subsequent demolding. However, in actual applications, there are the following problems: The film itself lacks adhesive force, and the transparent tape is prone to losing its adhesive ability after being heated in the mold. As a result, during the traction process, the film is pulled apart at the overlapping edge of the film due to the traction force, exposing a gap, and a small amount of resin enters the mold through the gap, resulting in difficult demolding or even failure. At this time, it is necessary to stop the machine for processing, seriously affecting production efficiency; moreover, when starting the machine again after stopping, it is necessary to rewind and apply the film, which is time-consuming and laborious, resulting in low production efficiency and increased production costs. Summary of the Invention

[0004] Aiming at the deficiencies of the existing winding film application technology, the purpose of the embodiment of this application is to provide a film application device for the production of continuous fiberglass wound pipes. By adopting a linear film application method, while ensuring the film tension, it effectively prevents resin from entering the mold shaft, effectively avoids the occurrence of difficult demolding, and ensures production efficiency.

[0005] To achieve the above purpose, the technical solution adopted in this application is: providing a film application device for the production of continuous fiberglass wound pipes, including: a bracket, a driving component, and a mold shaft. The mold shaft is rotatably arranged on the bracket and is driven to rotate by the driving component. A turntable is fixed on the mold shaft. The turntable rotates synchronously with the mold shaft and is coaxial. A plurality of film guiding frames and unwinding frames are equidistantly arranged at equal arcs on the turntable. The film guiding frames and the unwinding frames are arranged at intervals in one-to-one correspondence on the same radius line and the film guiding frames are arranged close to the center of the circle. A film roll is installed on the unwinding frame. The film is guided by the film guiding frame and then adheres to the mold shaft. The adhering direction of the film is parallel to the axis of the mold shaft. The sides of multiple films overlap. A thread unwinding roll is further provided on the bracket. A cotton thread roll is provided on the thread unwinding roll. The cotton thread is tied to the outside of the film and is wound around the outside of the film when the mold shaft rotates.

[0006] In one embodiment, at least 4 and an even number of film guiding frames are provided; the film guiding frames include long frames and short frames, the long frames and the short frames are arranged alternately, the film guided by the short frames is first attached to the die shaft, and the film guided by the long frames is then attached to the die shaft and overlaps with the edge of the previously attached film.

[0007] In one embodiment, the film guiding frame includes a fixing plate, two vertical rods spaced on the fixing plate, an extension rod fixed perpendicular to the vertical rods, and a guiding rod with both ends fixed to the two extension rods; wherein, the vertical rods of the long frames are longer than those of the short frames, and the vertical rods are parallel to the die shaft.

[0008] In one embodiment, two parallel long grooves are provided on the turntable in the radial direction, and the fixing plate is adjustably installed on the turntable through the long grooves.

[0009] In one embodiment, the unwind rack includes a U-shaped rack, a mounting shaft, a locking nut, and a limiting piece. Both ends of the mounting shaft are threaded sections. A notch is provided at the top of the open end of the U-shaped rack. The mounting of the mounting shaft is fixed in the notch through the locking nut. Two limiting pieces are provided and sleeved on the mounting shaft. The film roll is sleeved on the mounting shaft and located between the two limiting pieces.

[0010] In one embodiment, a circular groove is provided on the outer side of the notch of the U-shaped rack. A gasket is sleeved on the mounting shaft and accommodated in the circular groove and tightened by the locking nut.

[0011] In one embodiment, a number of groups of mounting holes are provided on the turntable at intervals in the radial direction, and the U-shaped rack is position-adjustably installed on the turntable through the mounting holes.

[0012] Another object of the present application is to provide a film feeding method for the production of fiberglass continuous winding pipes. Based on the above-mentioned film feeding device, the film feeding method includes the following steps:

[0013] S1. According to production requirements, install the corresponding number of film guiding frames and unwind racks on the turntable so that after multiple films are attached to the die shaft, the surface of the die shaft can be completely covered;

[0014] S2. Guide the film of the film roll through the film guiding frame and attach it to the surface of the die shaft, and tie it with cotton thread;

[0015] S3. The traction device works, and the film is linearly tractioned and moved in a direction parallel to the axis of the die shaft. At the same time, the driving component drives the die shaft to rotate synchronously, and the cotton thread is wound around the outside of the film synchronously.

[0016] The beneficial effects of the film feeding device for the production of fiberglass continuous winding pipes provided by the present application are as follows:

[0017] 1. The film is attached linearly and wound with cotton threads, so that during the heat curing process, it will not be affected by temperature and cause the resin to enter the mold shaft, effectively avoiding the problems of difficult demolding or shutdown.

[0018] 2. The film is attached linearly, ensuring that the film tension is not affected by heat curing and shutdown, and there is no need to re-tension before each startup; it is realized that when starting up again the next day, the film can be applied immediately, greatly improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a simplified structural schematic diagram of the film applying device for the production of fiberglass continuous winding pipes provided by the embodiment of the present application;

[0021] Figure 2 It is a planar structural schematic diagram of the turntable, film guiding frame, and unwinding frame in the film applying device provided by the embodiment of the present application;

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the film guiding frame in the film applying device provided by the embodiment of the present application;

[0023] Figure 4 It is a planar structural schematic diagram of the unwinding frame in the film applying device provided by the embodiment of the present application;

[0024] Figure 5 It is a side view structural schematic diagram of the U-shaped frame in the film applying device provided by the embodiment of the present application;

[0025] Figure 6 It is a planar structural schematic diagram of the limiting piece in the film applying device provided by the embodiment of the present application;

[0026] Figure 7 It is a layout schematic diagram of the film when the film applying device provided by the embodiment of the present application applies the film to the mold shaft;

[0027] Figure 8 It is a schematic diagram of the film applying device provided by the embodiment of the present application applying the film to the mold shaft and winding the cotton thread.

[0028] Among them, the reference numerals in the figures:

[0029] 1. Bracket; 2. Driving assembly; 3. Die shaft; 4. Turntable; 41. Long groove; 42. Mounting hole; 5. Film guiding frame; 51. Fixed plate; 52. Vertical rod; 53. Extension rod; 54. Guiding rod; 6. Unwinding frame; 61. U-shaped frame; 62. Mounting shaft; 63. Locking nut; 64. Limiting piece; 65. Notch; 66. Circular groove; 67. Gasket; 7. Pay-off reel. Detailed implementation manners

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0034] As Figures 1 - 8 shown, a film feeding device for the production of fiberglass continuous winding pipes provided by an embodiment of the present application will now be described. In the prior art, the fiberglass continuous winding pipe production line includes devices such as a frame, a die shaft 3, a fiberglass filament winding device, a resin tank, a heat curing device, a traction device, etc. The devices included in the production line are mature technologies and will not be described in detail here. Among them, the die shaft 3 is rotatably arranged on the bracket 1 and is driven to rotate by the driving assembly 2. The driving assembly 2 drives the die shaft 3 to rotate by using an existing motor combined with a chain and a gear.

[0035] The film-applying device of the present application is mainly aimed at improving the film-applying method of the PET film on the mold shaft 3. Specifically, a turntable 4 is fixed on the mold shaft 3, and the turntable 4 rotates synchronously with the mold shaft 3 and is coaxially arranged. A flange is welded on the mold shaft 3, and a through hole is provided in the middle of the turntable 4, and a circle of flange holes is provided around the through hole. After the turntable 4 is sleeved on the mold shaft 3, it is fixedly connected through the flange hole, bolts and flange to realize the fixed connection between the turntable 4 and the mold shaft 3, wherein the size of the through hole is larger than the diameter of the mold shaft 3, so that the same turntable 4 can be adapted to different mold shafts 3, and mold shafts 3 of different diameters can be replaced according to production requirements. Among them, the mold shaft 3 is preferably a mold shaft 3 with an oil groove in the prior art, which is convenient for the film to be pulled and the subsequent separation of the film from the mold shaft 3.

[0036] A plurality of film guide racks 5 and unwinding racks 6 are arranged at equal arc distances on the turntable 4. The film guide racks 5 and unwinding racks 6 are arranged one by one on the same radius straight line and the film guide racks 5 are arranged close to the center of the circle. The film roll is installed on the unwinding racks 6. The film is guided by the film guide racks 5 and then attached to the mold shaft 3. The attaching direction of the film is parallel to the axis of the mold shaft 3. Figure 7 As shown, the side edges of multiple films overlap, such as Figure 1 and Figure 8 As shown, the bracket 1 is also provided with a wire reel 7, and the wire reel 7 is provided with a cotton thread reel, and the cotton thread is tied to the outside of the film and is wound around the outside of the film when the mold shaft 3 rotates. The winding cotton thread can fix multiple films on the mold shaft 3, so that the overlapping parts of the films are tightly fitted together, avoiding gaps at the overlapping parts of the films. In the actual production process, the fiberglass fiber filaments will further wrap and fit the overlapping parts of the films when winding, ensuring that the resin will not flow into the mold shaft 3, thereby effectively avoiding the subsequent demoulding difficulties and shutdown phenomena, and ensuring production efficiency.

[0037] The film is linearly attached to the mold shaft 3 to ensure that it can withstand sufficiently large pulling force when being pulled by the traction device, and is not affected by heating and curing, and is not affected by shutdown. There is no need to re-pull before each start-up. The film can be applied immediately after the machine is restarted the next day, which greatly improves production efficiency.

[0038] In this embodiment, in order to ensure that multiple films can be attached to the mold shaft 3 and overlap at the edges, the width of the multiple films is greater than the circumference of the mold shaft 3 to ensure that there is an overlap margin. In order to ensure that the films overlap automatically when being pulled, at least 4 film guide racks 5 are set and the specific number is increased according to the diameter of the mold shaft 3; the even-numbered film guide racks 5 include long racks and short racks, the number of long racks and short racks is the same, and the long racks and short racks are staggered, such as Figure 7 As shown, the film guided by the short frame is first attached to the mold shaft 3, and the film guided by the long frame is attached to the mold shaft 3 later and overlaps with the edge of the film attached first, as shown in FIG.Figure 7 In the state shown, the two inner membranes are first attached to the mold shaft 3, and then the outer membrane is attached to the mold shaft 3 and overlaps with the edge of the inner membrane.

[0039] Specifically, as Figure 3 shown, the film guiding frame 5 includes a fixing plate 51, two vertical rods 52 spaced apart on the fixing plate 51, an extension rod 53 fixed on the vertical rod 52 and perpendicular to it, and a guiding rod 54 with both ends fixed on the two extension rods 53; among them, the vertical rod 52 of the long frame is longer than the vertical rod 52 of the short frame, and the vertical rod 52 is parallel to the mold shaft 3. The vertical rod 52 of the long frame is longer, so that its film guiding rod is far from the turntable 4, and when the film passes through this film guiding rod, it contacts the mold shaft 3 later. The function of the extension rod 53 is to set the film guiding rod close to the mold shaft 3.

[0040] In order to adapt to mold shafts 3 with different diameters, a plurality of groups of long slots 41 are provided on the turntable 4 in the radial direction. One group of long slots 41 includes two parallel long slots 41. One group of long slots 41 is used to install a film guiding frame 5. The fixing plate 51 is adjustably installed on the turntable 4 through the long slots 41. The fixing plate 51 can be specifically fixed and its position adjusted by bolts; or after the vertical rod 52 passes through the fixing plate 51, there is a threaded section. The threaded section passes through the long slot 41 to the back of the turntable 4. A connecting plate is sleeved on the two threaded sections on the back of the turntable 4 and then a nut is screwed on to ensure the stable docking position of the film guiding frame 5.

[0041] As Figures 4 - 6 shown, in this embodiment, the unwinding frame 6 includes a U-shaped frame 61, a mounting shaft 62, a locking nut 63 and a limiting piece 64. The bottom of the U-shaped frame 61 is fixed on the turntable 4. Both ends of the mounting shaft 62 are threaded sections. There is a notch 65 at the top of the open end of the U-shaped frame 61. The connecting sections of the mounting shaft 62 are clamped in the notch 65 and then fixed on the U-shaped frame 61 through the locking nut 63. Two limiting pieces 64 are provided and sleeved on the mounting shaft 62. The film roll rotates and is sleeved on the mounting shaft 62 and is located between the two limiting pieces 64; the limiting piece 64 is in a three-leaf shape. In order to prevent the mounting shaft 62 from slipping out of the notch 65, a circular groove 66 is provided on the outer side of the notch 65 of the U-shaped frame 61. A gasket 67 is sleeved on the mounting shaft 62 and is accommodated in the circular groove 66 and is tightened by the locking nut 63. In this way, the gasket 67 and the U-shaped frame 61 are fixed as a whole, which can effectively prevent the mounting shaft 62 from slipping out of the notch 65 and ensure that the film roll will not pull the rotating shaft out of the notch 65 when the film is normally rotated and unwound. Unscrew the nut and pull out the gasket 67 to remove the mounting shaft 62, which is convenient for replacing a new film roll.

[0042] In this embodiment, a number of groups of mounting holes 42 are provided on the turntable 4 at intervals in the radial direction. The U-shaped frame 61 is adjustably installed on the turntable 4 through the mounting holes 42. The bottom of the U-shaped frame 61 is fixed on the turntable 4 by the cooperation of bolts and the mounting holes 42.

[0043] This embodiment also provides a film applying method for the production of fiberglass continuous winding pipes. Based on the film applying device described above, this film applying method includes the following steps:

[0044] S1. According to the production requirements (the perimeter size of the mold shaft 3), install the corresponding number of film guiding frames 5 and unwinding frames 6 on the turntable 4 so that after multiple films are attached to the mold shaft 3, the surface of the mold shaft 3 can be completely covered; as Figure 7 shown, after multiple films are attached, they can completely wrap the circumferential surface of the mold shaft 3.

[0045] S2. Guide the film of the film roll through the film guiding frame 5 and attach it linearly to the surface of the mold shaft 3, and tie it with cotton thread;

[0046] S3. The traction device works, and the film is linearly tractioned and moved in a direction parallel to the axis of the mold shaft 3. At the same time, the driving component 2 drives the mold shaft 3 to rotate synchronously, and the cotton thread is wound around the outside of the film synchronously.

[0047] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A film-laying device for producing a glass fiber reinforced plastic continuous winding pipe, comprising: A support (1), a driving assembly (2) and a mold shaft (3), wherein the mold shaft (3) is rotatably arranged on the support (1) and driven to rotate by the driving assembly (2), and is characterized in that: a turntable (4) is fixed on the mold shaft (3), the turntable (4) rotates synchronously with the mold shaft (3) and is coaxial, a plurality of film guide frames (5) and unwinding frames (6) are arranged at equal arc distances on the turntable (4), the film guide frames (5) and the unwinding frames (6) are arranged in a one-to-one correspondence and interval on the same radial straight line, and the film guide frames (5) are arranged close to the center of the circle, the film roll is installed on the unwinding frame (6), and the film is guided by the film guide frame (5) and then adhered to the mold shaft (3), the laminating direction of the film is parallel to the axis of the mold shaft (3), and the side edges of the plurality of films overlap, and the support (1) is also provided with a wire reel (7), and a cotton thread reel is arranged on the wire reel (7), and the cotton thread is tied to the outside of the film and is wound around the outside of the film when the mold shaft (3) rotates.

2. The film-laying device for producing the FRP continuous winding pipe according to claim 1, characterized in that: At least four film guide frames (5) are provided and the number is even; the film guide frames (5) include long frames and short frames, the long frames and the short frames are arranged alternately, the film guided by the short frames is first attached to the mold shaft (3), and the film guided by the long frames is then attached to the mold shaft (3) and overlaps with the edge of the film attached first.

3. The film-laying device for producing the FRP continuous winding pipe according to claim 2, characterized in that: The film guide frame (5) comprises a fixed plate (51), two vertical rods (52) arranged at intervals on the fixed plate (51), an extension rod (53) fixed on the vertical rod (52) and perpendicular to the vertical rod (53), and a guide rod (54) fixed at both ends to the two extension rods (53); wherein the vertical rod (52) of the long frame is longer than the vertical rod (52) of the short frame, and the vertical rod (52) is parallel to the mold axis (3).

4. The film-laying device for producing the FRP continuous winding pipe according to claim 3, characterized in that: The rotating disk (4) is provided with two parallel long grooves (41) along the radial direction, and the fixing plate (51) is adjustably mounted on the rotating disk (4) through the long grooves (41).

5. The film-loading device for producing a glass fiber reinforced plastic continuous winding pipe according to any one of claims 1 to 4, characterized in that: The unwinding frame (6) comprises a U-shaped frame (61), a mounting shaft (62), a locking nut (63) and a limiting plate (64); both ends of the mounting shaft (62) are threaded sections; a notch (65) is provided at the top of the open end of the U-shaped frame (61); the mounting shaft (62) is fixed in the notch (65) by a locking nut (63); two limiting plates (64) are provided and are sleeved on the mounting shaft (62); the film roll is sleeved on the mounting shaft (62) and is located between the two limiting plates (64).

6. The film-laying device for producing the FRP continuous winding pipe according to claim 5, characterized in that: A circular groove (66) is provided on the outer side of the notch (65) of the U-shaped frame (61); a gasket (67) is sleeved on the mounting shaft (62) and accommodated in the circular groove (66) and tightened by the locking nut (63).

7. The film-laying device for producing the FRP continuous winding pipe according to claim 6, characterized in that: The turntable (4) is provided with a plurality of groups of mounting holes (42) at intervals along a radial direction, and the U-shaped frame (61) is mounted on the turntable (4) in an adjustable manner through the mounting holes (42).

8. A film-laying method for producing a glass fiber reinforced plastic continuous winding pipe, based on the film-laying device according to any one of claims 1 to 7, characterized in that: The film-laying method comprises the following steps: S1. According to production requirements, a corresponding number of film guide racks (5) and unwinding racks (6) are installed on the turntable (4), so that a plurality of films can completely cover the surface of the mold shaft (3) after being attached to the mold shaft (3); S2, guiding the film of the film roll through the film guide frame (5), laminating it on the surface of the mold shaft (3), and tying it with cotton thread; S3, the traction device works, and the film is pulled and moved in a straight line in a direction parallel to the axis of the mold shaft (3). At the same time, the driving component (2) drives the mold shaft (3) to rotate synchronously, and the cotton thread is synchronously wound around the outside of the film.

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