JPS5923979B2 - Method for forming the inner surface of uncured reinforced pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides uncured resin-reinforced pipes, uncured mortar-reinforced pipes, uncured composite reinforced pipes, etc., which are centrifugally formed by incorporating glass fiber or the like on the inner peripheral surface of a rotary mold. The present invention relates to a method for forming the inner surface of a hardened and reinforced tube.

Generally, in the centrifugal molding method, a fiber-reinforced resin layer is molded in a rotating mold, a resin mortar layer is molded inside this fiber-reinforced resin layer, and then a fiber-reinforced resin layer is molded again inside the resin mortar layer. to obtain an uncured composite reinforced pipe,
Alternatively, the molding of the resin mortar layer is omitted and an uncured resin-reinforced pipe having only the fiber-reinforced resin layer is obtained.

In any case, the innermost surface is usually formed of a fiber-reinforced resin layer. Examples of internal reinforcing fibers include cutter fibers cut into appropriate lengths, continuous thread-like roping fibers, and matte fibers woven into cloth, but with the centrifugal molding method described above, the inner (inner surface) Since this cannot be done, the various fibers mentioned above will come out and a smooth molded inner surface cannot be obtained. In other words, a portion of the cutter fibers may be exposed from the inner surface of the mold, a portion of the roping fiber may form a loop and be exposed from the inner surface of the mold, or an edge of the mat fiber may rise and be exposed from the inner surface of the mold. . In order to solve this problem, it is necessary to increase the amount of resin input, which leads to an increase in cost.Furthermore, since the fiber ratio can only be 40 to 50%, the strength decreases. invite Therefore, the present invention provides a method for forming the inner surface of an uncured reinforcing tube that can solve the above-mentioned problems, and one embodiment thereof will be described below with reference to the drawings.

FIG. 1 shows a state in which various uncured reinforcing tubes 2 are centrifugally formed on the inner peripheral surface of a rotary mold 1.

This rotary mold 1 can be divided into two in the circumferential direction, and can be rotated around a horizontal axis 4 via a plurality of rolls 3, and the rotational power is applied from the roll 3 side. There is. A film tube supply pipe 5 movable on the horizontal axis 4 is disposed outside one end of the rotary mold 1. In other words, the film tube supply pipe 5 is supported by a plurality of rolls 6, and is inserted into the rotary mold 1 from one end side (see the imaginary line in Fig. 1) and pulled out by the forward and reverse rotation of the driving rubber roll 7. (See solid line in Figure 1). A solvent-resistant film tube 8 is inserted into the film tube supply pipe 5 while being contracted in the circumferential direction. The film tube 8 is open at both ends, and a rotating shaft 9 is disposed within the film tube supply pipe 5 through the opening. One end of the rotating shaft 9 is supported by a bearing 10 on the side of the film tube supply pipe 5, and one end is interlocked with a motor 11 with a variable gear mechanism attached to the film tube supply pipe 5. As a result, the rotating shaft 9 is rotatable around the horizontal axis 4, and the other end of the film tube supply pipe 5 of the rotating shaft 9, which projects outward, is rotatable around the horizontal axis 4. A press defoaming tool 12 is installed. This press defoaming tool 12 consists of a fixing rod 1 attached to the other end of the rotating shaft 9.
3, a swinging rod 15 in the front-back direction attached to the end of this fixed rod 13 via a horizontal pin 14 so as to be able to stand up and fall sideways, and an idling roll 16 attached to the end of this swinging rod 15. , and a fixture (see FIG. 2) 17 that integrates both rods 13 and 15 when the swing rod 15 is erected. A cover 18 is fitted onto the film tube supply pipe 5 via a seal ring 19, and can be attached to one end of the rotary mold 1 via a fixture 20 (see FIG. 2).

This cover 18 has a suction pipe 22 with a valve 21.
is attached to communicate the inside of the cover 18 with a vacuum pump (not shown). Reference numeral 23 denotes a holding ring that holds the other end of the film tube 8, and can be attached to the other end of the rotary mold 1 via a fixture (see FIG. 2) 24.

As shown by the solid line in FIG. 1, an uncured reinforcing tube 2 is centrifugally formed on the inner peripheral surface of the rotary mold 1, and the driving rubber roll 7 is driven while the rotary mold 1 is stopped, as shown by the phantom line. Insert the film tube supply pipe 5 into the rotary mold 1 as shown in FIG. Next, the other end of the film tube 8 is pressed with a defoaming tool 12.
After pulling out the swinging rod 15 so as to surround it, the swinging rod 15 is erected and integrated with the fixed rod 13 by the fixing tool 17, and the idle roll 16 is attached to the inner surface of the ring part of the rotary mold 1 via the film tube 8. to press. Then, the other end of the film tube 8 is held between the rotary die 1 and the presser ring 23 and integrated with the fixture 24. Furthermore, the cover 18 is attached to the rotary mold 1 via the fixture 20. In this state, valve 2
While opening 1 and suctioning the inside of cover 18,
The driving rubber roll 7 is operated. The driving rubber roll 7 is reversely driven, and the film tube supply pipe 5 is gradually pulled out to one end side. As a result, the film tube 8 is taken out from the film tube supply pipe 5 while remaining.
Since the space between the outer surface of the film tube 8 and the cover 18 forms a negative pressure chamber, the removed portion is gradually transferred onto the inner circumferential surface of the uncured reinforcing tube 2. Due to this transition, the contact range of the film tube 8 gradually expands from the other end side to the one end side as the film tube supply pipe 5 is pulled out, so that wrinkles etc. do not occur on the film tube 8 at all. . When the film tube supply pipe 5 is extracted and moved, the press defoaming tool 12 rotates around the horizontal axis 4 and moves together, and the idle roller 16 moves the uncured reinforcing pipe 2 through the film tube 8. will be pressed. This pressing position moves sequentially as shown above, and as it moves, a pressing squeezing action occurs to defoam the uncured reinforcing pipe 2, and at the same time remove the exposed portions of the uncured reinforcing pipe 2, for example. The reinforcing tube 2 is pressed into the cured fiber-reinforced resin layer 1, and as shown in FIG. 2, the inner peripheral surface of the uncured reinforcing tube 2 is gradually press-molded. The idle roll 16 comes off the uncured reinforcing tube 2 and faces the ring part of the rotary mold 1, and the entire film tube 8 is taken out from the film tube supply tube 5 and covers the entire inner surface of the uncured reinforcing tube 2. Valve 21 in condition
Close. Next, as shown in FIG.
2 is taken out from the rotary mold 1. Thereafter, the rotary mold 1 is lowered from the roll 3, and the rotary mold 1 is dismantled as shown in FIG.
It is taken out from the rotary mold 1 together with the mold. Depending on the length of the film tube 8 and the film tube supply pipe 5 and the negative pressure in the negative pressure chamber, air flows into the negative pressure chamber through the gap between the film tube 8 and the film tube supply pipe 5. Seal leakage may occur.

In order to completely prevent this, for example, as shown in FIG. A resin supply port 26 communicating with the film tube is opened toward the inside of the outer opening 5A, and the resin reservoir 25 is connected to a resin supply device (not shown) via a resin supply path 27 formed in the film tube supply pipe 5. are doing. According to this, since the resin can be supplied between the outward opening portion 5A and the film tube 8, the sealing at this portion can be reliably performed. Since the film tube 8 is brought into contact with the uncured reinforcing tube 2, it is preferable to use the same resin as the resin used for the uncured reinforcing tube 2 as the sealing resin. As shown in phantom lines in FIG. 2, a cover plate 28 may be attached to the seal ring 19, and the inside of the film tube 8 may be pressurized through an air supply pipe 29 attached to the cover body 28.

As described above, according to the present invention, the film tube is brought into contact with the inner surface of the unhardened reinforcing tube in a state where the contact action starting position is sequentially moved in the axial direction of the unhardened reinforcing tube. Since the range is sequentially expanded, the film tube can be coated without wrinkles.

In addition, as the abutment action start position moves sequentially, the press defoaming tool rotates inside the abutment action position, so the inner surface of the uncured reinforcing tube is press-formed via the film tube. For example, it is possible to push in exposed parts such as katsuta fibers, and to promote defoaming. Further, by applying a suction force to the outer surface of the film tube, defoaming can be promoted and the transfer of the film tube to the inner surface of the uncured composite tube can be facilitated.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIGS. 1 to 4 are partially cutaway side views showing a state in which the driver is in operation, and FIG. 5 is a vertical sectional side view of a main part showing another embodiment. DESCRIPTION OF SYMBOLS 1...Rotating type, 2...Uncured reinforcing tube, 4...Horizontal axis, 5...Film tube supply pipe, 8...Film tube, 9...Rotating shaft, 12...・Press deaerator, 16... Idle roll, 18... Cover, 22...
- Suction pipe, 23... Holding ring, 26... Resin supply port.

Claims (1)

[Claims] 1. To form the inner surface of an uncured reinforcing tube that has been centrifugally molded on the inner peripheral surface of a rotary mold, a film tube supply tube containing a shrunken film tube is inserted into the rotary mold from the other end, and this film is The other end of the tube is hermetically fixed to the other end of the rotary mold, and a pressure defoaming device that is rotatable around the horizontal axis of the rotary mold is positioned outside the other end of the film tube supply pipe, and these film tube supply tubes are The film tube is removed from the film tube supply pipe while the tube and the pressure defoaming tool are removed and moved together, and at this time, the interior of the rotary mold on the outside of the film tube is evacuated, and the removed film tube is gradually removed. A method for forming the inner surface of an uncured reinforcing tube, which comprises moving the film tube onto the inner circumferential surface of the uncured reinforcing tube and pressing the film tube against the inner surface of the uncured reinforcing tube using a pressing defoaming tool that moves while rotating.