JPS6412217B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing tubes, and more particularly to an apparatus for manufacturing tubes of constant wall thickness made of thermosetting material.

As a manufacturing device for tubes made of thermosetting materials,
A strip is wound around the core rod to form a core mold that moves in the axial direction of the core rod. Rolls are provided with a gap on the sides of the core mold, and molding material is supplied onto the core mold to form the tube. For example, a device designed to form
This is already known from Publication No. 99169. This device is certainly convenient because it allows tubes to be manufactured efficiently. However, this device still had some imperfections. The problem is that in this device, the core rod is supported in a cantilevered manner, and the product tube is cut far away from the support point, so the core rod is prone to swinging, which causes the relationship between the core mold and the roll. The problem is that it is not easy to obtain a tube with variable gaps and therefore completely constant wall thickness.

The inventor attempted to improve the above device. If an endless belt with a constant thickness is interposed between the core mold and the roll and the belt is rotated while being in contact with the core mold and the roll, the gap between the core mold and the roll is kept constant, and the belt is rotated while being in contact with the core mold and the roll. I realized that I could get a tube with accurate wall thickness. This invention is
This was done based on this knowledge.

That is, the present invention configures a core mold that moves in the axial direction of the core rod by wrapping a strip around the core rod,
In a tube manufacturing device in which a roll is provided with a gap on the side of a core mold, and a forming material is supplied onto the core mold to form a tube, an endless pipe with a constant thickness between the core mold and the rolls is used. The belt is interposed and the belt is rotated while in direct or indirect contact with the core mold and roll, the above gap is kept constant, the belt width is made smaller than the roll width, and the moving core mold surface is separated from the belt. A device for manufacturing tubes which is subsequently brought into contact with the molding material.

An example of the implementation of the pipe manufacturing apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a plan view schematically showing an example of a manufacturing apparatus according to the present invention. FIGS. 2 and 3 are front views schematically showing a method of rotating an endless belt in the apparatus of the present invention.

In FIG. 1, reference numeral 1 denotes a core rod, which is supported by a stand 11 in a cantilevered manner. Reference numeral 2 denotes a belt-like material, which is wound around the core rod 1 and constitutes a core mold 22 that is rotated and given forward motion by a drive belt 21 to move in the axial direction of the core rod 1. 3 is a roll, which is provided on the side of the core mold 22 with a gap therebetween. 4 is a supply device, which supplies molding material 41 onto the core mold 22. 5 is an endless belt. The belt 5 has a constant thickness and rotates while being stretched between the roll 3 and the support wheel 51, and is sandwiched between the core mold 22 and the roll 3 on the roll 3 side.
By sandwiching the belt 5, the gap between the core mold 22 and the roll 3 is maintained at a constant value equal to the thickness of the belt 5. The width of the belt 5 is made smaller than the width of the roll 3, and the belt 5 is biased toward the table 11 on the roll 3, so that the surface of the core mold 22 comes into contact with the molding material 41 after being separated from the belt 5. It's like that.

In the above device, the core rod 1 may be stationary or rotating. Further, it may be supported at both ends. The strip 2 is made of steel, cardboard, or the like. The strip 2 may be endless. roll 3
are made of iron, aluminum, plastic, etc. The roll 3 may be cylindrical or may have a taper whose diameter gradually increases along the direction of movement of the core mold 22. It is preferable that the roll 3 is driven separately from the core mold 22 and is pressed toward the core mold 22. As the pressing means, in addition to the illustrated cylinder 31, gravity (when the shaft is directed toward the core rod and is supported by a falling rod), a spring, etc. can be used.

The supply device 4 may be of a batch type or a continuous type.

The belt 5 is made of steel, hard rubber, cloth, rubberized cloth, or the like. The thickness of the belt 5 should correspond to the wall thickness of the tube to be formed, but generally 5.
Approximately 15 mm to 15 mm is appropriate, and approximately 10 mm is preferable. The belt 5 is attached to a spring 52 as shown in FIG.
It is preferable to use a support wheel 51 provided with a support wheel 51 to tension it, and to remove deposits using a cleaning device 53. Note that the belt 5 can also be rotated by being placed between the core mold 22 and the support wheel 51, as shown in FIG. Further, the belt 5 may be rotated by the rotation of the roll 3 or the core mold 22, or may be driven by another drive device.

The device of this invention is used as follows. In FIG. 1, a strip 2 is spirally wound around a core rod 1, and a drive belt 21 provides forward and rotational motion. Further, the roll 3 is rotated by another drive device, and is pressed toward the core mold 22 by a cylinder 31. In this state, the molding material 41 is supplied onto the core mold 22, but before that, the release film 23 is wound around the core mold 22. In addition, the illustrated example shows a case where a composite pipe is manufactured, and the molding material 41
The inner layer 42 is wound before being supplied, and the outer layer 43 is wound after being supplied.
It is designed to be wound around. Of course, if a single layer tube is manufactured, the inner layer 42 and outer layer 43 do not need to be wound.

As the molding material 41, one made of a binder and a filler is used. Suitable binders include uncured thermosetting resins such as polyester resin and epoxy resin, cement, gypsum, etc. Suitable fillers include sand, calcium carbonate, clay, foam, short fibers, etc. It is. When supplying the molding material 41, an endless belt 5 having a constant thickness is interposed between the roll 3 and the core mold 22, and is in direct contact with the roll 3.
3 and the inner layer 42, the thickness of the molding material 41 is always equal to the thickness of the belt 5.

As the inner layer 42 and the outer layer 43, rovings of glass fiber, carbon fiber, natural fiber, chemical fiber, etc. are used. It is desirable that these fibers be impregnated with an uncured thermosetting resin in advance or after being wound. Instead of fibers, mats, sheets, etc. may be used. After winding the outer layer 43, it is heated in the oven 6 to harden the uncured resin to obtain a product.

The pipe manufacturing apparatus according to the present invention includes an endless belt having a constant thickness interposed between the core mold and the roll,
Since the belt is rotated while in direct or indirect contact with the core mold and the roll to maintain a constant gap between the core mold and the roll, the molding material supplied onto the core mold always has a constant thickness. be done. Therefore, a tube with a constant wall thickness and a constant outer diameter can be obtained. Furthermore, since the belt width is made smaller than the roll width and the moving core surface comes into contact with the molding material after leaving the belt, the molding material is less likely to adhere to the belt. As described above, the pipe manufacturing apparatus according to the present invention has excellent advantages.

[Brief explanation of drawings]

FIG. 1 is a plan view schematically showing an example of the pipe manufacturing apparatus of the present invention, and FIGS. 2 and 3 are front views schematically showing a method of rotating an endless belt in the apparatus of the present invention. It is. Explanation of symbols, 1... core rod, 2... strip-shaped object, 3...
... Roll, 4 ... Supply device, 5 ... Endless belt,
6... Oven, 11... Stand, 21... Drive belt, 22... Core mold, 23... Release film, 31
... cylinder, 41 ... molding material, 42 ... inner layer, 43 ... outer layer, 51 ... support wheel, 52 ... spring, 53 ... cleaning device.

Claims (1)

[Claims] 1 Wrap a strip around the core rod to form a core mold that moves in the axial direction of the core rod, provide a roll with a gap on the side of the core mold, and supply molding material onto the core mold. In a pipe manufacturing device configured to form a pipe,
An endless belt with a constant thickness is interposed between the core mold and the roll, and the belt is rotated while in direct or indirect contact with the core mold and the roll to maintain the above gap constant and make the belt width smaller than the roll width. A device for manufacturing tubes, which is made smaller so that the moving core surface comes into contact with the molding material after leaving the belt.