JPS61274928A - Method and apparatus for preparing pipe - Google Patents

Abstract

PURPOSE:To facilitate not only the winding of a core tape constant winding angle but also the withdrawal of the wound tape from a mandrel, by arranging the core tape on the mandrel along the axial direction thereof and winding a filament comprising composite fibers around the core tape through a delivery eyelet in a twill weave state. CONSTITUTION:At first, a mandrel 3 is covered with a dummy tube 60 and the leading end of the core tape 14 from a tape supply bobbin 11 is connected to the pipe end of said dummy tube 60 and a pipe withdrawing apparatus 7 is driven to draw out the dummy tube 6 to the direction shown by an arrow. Filament 26, 40 comprising composite fibers receiving prepreg treatment are continuously wound around the core tape 14 in a twill weave state by using delivery eyelets 34, 36 while said core tape 1 is delivered. The molded pipe obtained by winding the filaments comprising composite fibers around the core tape 14 is guided to a heat-curing apparatus 6 and passed through a compression roller row 49 to be compressed and cured. after the dummy tube was passed as mentioned above, a synthetic resin pipe is prepared automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a method and apparatus for manufacturing a tube, and in particular to a method and apparatus for manufacturing a tube, and in particular, a filament of thermosetting synthetic resin is wound around a mandrel and then heated and cured to continuously manufacture a tube. The present invention relates to a method and apparatus for manufacturing a tube.

[Technical Background of the Invention and Similar Points] Generally, a method of manufacturing a tube by winding a filament of a thermosetting resin around the circumferential surface of a mandrel and curing it by heating is known. However, when using conventional tube manufacturing methods, it is difficult to control the winding angle to be constant when winding the filament on a mandrel, and when a thermoset tube product is mounted on a mandrel and pulled out, the direction in which the diameter decreases is There was a problem in that the frictional force between the pipe and the mandrel increased due to the force of the pipe, making it difficult to pull out the product pipe.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to provide a method for manufacturing a tube that allows a filament made of synthetic resin to be easily wound around a mandrel at a certain angle, and also to be easily pulled out from the mandrel. The goal is to provide equipment.

[Summary of the invention]

In order to achieve the above object, the method for manufacturing a synthetic resin pipe according to the present invention involves attaching a plurality of core tapes along the axial direction on the entire circumferential surface of a mandrel, and applying synthetic resin pipes from above the core tapes. The synthetic resin tube is characterized in that at least two filaments are wound in a twill pattern and cured by passing through a heating furnace, and the cured synthetic resin tube is continuously drawn out.

In addition, the synthetic resin pipe manufacturing apparatus according to the present invention includes a mandrel fixedly held on a base frame, and a core tape supply in which a plurality of core tapes are attached along the axial direction over the entire outer peripheral surface of the mandrel. a winding device that continuously winds a plurality of synthetic resin filaments in a twill pattern over the core tape; a heat curing device that heats and hardens the pipe product around which the filaments are wound;
The present invention is characterized by being equipped with a vibrator pulling device that continuously pulls out the hardened synthetic resin pipe.

C Embodiment of the Invention] Hereinafter, an embodiment of the pipe manufacturing method and apparatus according to the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 indicates a base frame, and an upright frame 2 is erected at the left end of the base frame 1, and at its upper end is the base end of a mandrel 3 having a horizontal axis (left end in the figure). is carried. This mandrel 3
A core tape supply device 4, a filament winding device 5, and a heat curing device 6 are arranged at regular intervals between the base end and the free end of the mandrel along the axis of the mandrel. Further, a vibrator pulling device 7 is arranged on the exit side of the heat curing device @6.

The core tape supply device 4 has a fixed tube 8 disposed outside the mandrel 3 and concentrically therewith, and its rear end is fixedly supported by a bearing stand 9. A fixed disk 10 is fixed to the front end of the fixed tube 8, and four tape supply bobbins 11 are arranged on the front surface of the fixed disk 10 at equal intervals on the circumference. The bobbin shaft 13 is rotatably held on the top of the bobbin shaft 13 . Core tape 1 fed out from each bobbin 11
4 is attached to the entire outer peripheral surface of the mandrel 3 by the action of a guide roller 15, as shown in FIG. It is desirable to use reinforced fiber tape as the core tape 14, and the width of the core tape 14 is set to 174 mm, which is the circumference of the mandrel 3 in this embodiment, and four tapes are arranged in parallel. A cylinder is formed when

Each of the guide rollers 15 is supported by a bearing,
These bearings are held at the tip of a support arm 16 extending from the outer periphery of the fixed disk 10.

On the other hand, an inner rotary tube 20 and an outer rotary tube 21 are mounted on the outside of the fixed tube 8 so as to be concentric and rotatable in different directions.

The inner rotating tube 20 is rotatably supported on a bearing pedestal 22, while the outer rotating tube 21 is rotatably supported on a bearing pedestal 23. As shown in FIG. 3, these rotary tubes 20 and 21 are driven to rotate at a predetermined rotational speed in the opposite direction to the rotation of the pulse motor M via a reduction gear mechanism G.

Thus, an inner rotating disk 24 is fixed to the front end of the inner rotating tube 20, and the outer rotating tube 20 is similarly fixed.
An outer rotary disk 25 is fixed to the front end of the rotor 1, and the two are spaced apart from each other in the axial direction.

On the front surface of the inner rotary disk 24, there are a plurality of bobbins 27, 27.・
..., 27 are arranged at equal intervals on the circumference.

As shown in FIG. 4, each of these bobbins 27 is placed on a support base 28 and is held rotatably about a bobbin shaft 29 that is orthogonal to the axis of the mandrel 3.

Further, in order to provide drawing resistance to the filament 26, rotational resistance is provided to the bobbin shaft 29 by a known means.

As shown in FIG. 5, the base end of a sheave support rod 3o is rigidly connected to the outer periphery of the inner rotating disk 24, and a sheave support rod 3o is connected near the free end of the sheave support rod 30. A support 31 is extended laterally, and a plurality of, for example three, sheaves 32, 32, 32 are rotatably supported on this sheave support 31. Furthermore, a stem 33 that extends vertically downward is coupled to the tip of the sheave support rod 30.

In this embodiment, four sheave support rods 30 are provided, and a ring-shaped delivery eye 34 is connected to the inner ends of these four stems 33.

On the peripheral wall of the delivery eye 34, through holes 35, 35. ..., 35 are bored at equal intervals in the circumferential direction. In addition, sheave support 3
A filament guide 36 is fixed to the sheave support rod 30 at a position adjacent to the sheave support rod 1, and this guide 36 has a plurality of through holes 38 for passing the filament 26 through, thereby preventing the filaments 26 from becoming entangled with each other. .

Similarly, on the front surface of the outer rotating disk 25, a plurality of bobbins 41, 41 each wound with a synthetic resin filament 40 are provided.
．． ..., 41 are arranged at equal intervals on the circumference. Each of these bobbins 41 is placed on a support base 42 and is held rotatably about a bobbin shaft 43. Further, the base end of a sheave support rod 44 is fixedly held on the outer periphery of the outer rotating disk 25, and a stem 45 extending vertically downward is coupled to the free end of the sheave support rod 44. A ring-shaped delivery eye 46 similar to the delivery eye 34 is coupled to the tip of each of the plurality of stems 45 . The synthetic resin filament 40 wound around the bobbin 41 is passed through the through hole of the filament guide and wound around a plurality of sheaves, similar to the inner filament shown in FIG. 5, and then delivered. It is fed through a through hole in eye 46.

The heat curing device 6 is mounted on the base frame 1 and has inside thereof a heated seedling 48 that is heated using thermal energy such as electromagnetic waves or high frequency waves. 49 is equipped. These compression roller rows 49 include three pairs of rollers, an upper roller 50 and a lower roller 551, arranged at intervals in the running direction.

These rollers 50, 51 are configured to press-form the upper and lower halves of the forming tube.

On the other hand, the pipe drawing device 7 connects the formed pipes in the direction of the arrow and draws the formed pipe product from the tension mandrel 3. Various examples can be considered for the pipe pulling device 7 that has such an effect, but in this embodiment, an endless belt 54 that is passed around the driving wheel 52 and the driven wheel 53, and this endless belt 54 are used. It consists of a large number of pipe grippers 55 installed at regular intervals. This tube gripper 55 is the eighth
As shown in the figure, it consists of a pair of gripping pawls 56, 57 and a compression spring 58 that is loaded between them and causes the pawls to approach each other. The pipe drawing device 7 described above is not limited to the one shown in the drawings, but may also include a series of pinch rollers that are engaged with each other to send out the formed pipe to the downstream side.

Next, a method for manufacturing a synthetic resin pipe according to the present invention will be explained.

At the initial stage of manufacturing, the dummy tube 60 is first placed on the mandrel 3, the tip of the core tape 14 from the tape supply bobbin 11 is connected to the tube end of the dummy tube 60, and the pipe drawing device 7 is driven to pull the dummy tube 60 in the arrow direction. Pull it out in the viewing direction. Then, while the core tape 14 is being fed out, the prepreg-treated composite fiber filaments 26 and 40 are continuously wound on the core tape 14 in a twill weave. This winding work is an inner rotating circle! 24 and the outer rotary disk 25 in opposite directions, the bobbin 2
7 and the bobbin 41 to draw out filaments of the composite fiber. The formed tube obtained by winding the composite fiber filament on the core tape 14 in this manner is led to the heat curing device 6, where it is compressed and hardened as it passes through the compression roller row 49. In this way, after the dummy tube has passed, a synthetic resin pipe is automatically manufactured. By the way, the molded tube can be cut to a predetermined length using a cutting saw.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the composite fiber filament wound around a bobbin is wound around a sheave and then passed through a delivery eye and wound in a twill pattern onto a core tape on a mandrel. By doing so, the filament of the composite material 1111t can be wound at a certain angle. In addition, since the core tape is placed on the mandrel along the axial direction, there is a large W on the mandrel when pulling out the formed tube. It can be pulled out without any friction.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a pipe manufacturing apparatus according to the present invention;
Figure 2 is an explanatory diagram showing the feeding situation of the core tape, Figure 3
The figure is an explanatory view showing the drive mechanism of the rotating tube, FIG. 4 is a side view showing the bobbin holding mechanism, and FIG. 5 is a perspective view showing the path for leading out the composite fiber filament from the bobbin. FIG. 6 is a perspective view showing a delivery eye for supplying filament, FIG. 7 is a perspective view showing a forming tube handling device, and FIG. 8 is a front sectional view showing a forming tube grip mechanism. . 1... Base frame, 3... Mandrel, 4...
- Core tape supply device, 5... Filament winding device, 6... Heat curing device, 7... Pipe drawing device, 11... Tape supply bobbin, 15... Guide roller, 20... Inner rotation, tube, 21...
- Outer rotating tube, 27.41... bobbin, 26.
40...Filament, 34.46...Delivery
Ai. Applicant's agent Kiyoshi Inomata No. 6, Figure 2, $8

Claims (1)

[Claims] 1. A plurality of core tapes are attached without any gaps along the axial direction on the circumferential surface of the mandrel, and at least two filaments made of synthetic resin are placed on top of the core tapes in a twill pattern. 1. A method for manufacturing a composite pipe, characterized by winding the composite material into a pipe, passing it through a heating furnace to harden it, and continuously drawing out the hardened pipe product. 2. A mandrel fixedly held with respect to the base frame, a core tape supply device that attaches a plurality of core tapes along the axial direction to the outer circumferential surface of the mandrel, and at least one of synthetic resin is applied over the core tapes. A winding device that continuously winds two filaments in a twill pattern;
A pipe manufacturing device comprising a heat curing device that heats and hardens the wound pipe product, and a pipe drawing device that continuously pulls out the pipe product from a mandrel. 3. The core tape supply device includes a fixed disk, and a plurality of bobbins arranged on the fixed disk at equal intervals in the circumferential direction and rotatable around a bobbin axis perpendicular to the axis of the mandrel. The pipe manufacturing apparatus according to claim 2, characterized in that: 4. The above-mentioned filament winding device includes at least two rotating disks that are rotatable in different directions and arranged concentrically, and a bobbin shaft that is attached to the front surface of these rotating disks and is perpendicular to the axis of the mandrel. a plurality of rotatable filament bobbins; a horizontal support arm that is cantilever-supported by the rotating disk and extends substantially parallel to the axis of the mandrel; and a horizontal support arm extending radially inward from the tip of the horizontal support arm. an extended vertical support arm;
3. The tube manufacturing apparatus according to claim 2, further comprising a delivery eye coupled to an inner end of the vertical support arm.