JPS6150763B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a resin supply method in centrifugal molding having a cylindrical mold rotatable around a horizontal axis and a resin supply nozzle movable within the cylindrical mold along the horizontal axis. It is related to.

Conventionally, resin supply was carried out using a pump, and according to this, a small amount of resin was supplied at the beginning and end of resin supply in the length direction of the cylindrical shape, and However, centrifugally molded resin pipes tend to have thin walls at both ends.

The present invention aims to solve the above problems.

That is, the present invention provides centrifugal molding having a cylindrical mold rotatable around a horizontal axis and a resin supply nozzle movable within the cylindrical mold along the horizontal axis, which is linked to the movement of the resin supply nozzle. The present invention provides a resin supply method in centrifugal molding in which a resin liquid in a cylinder chamber is force-fed to the resin supply nozzle using a cylinder device that contracts. According to this method, resin can be automatically supplied in conjunction with the movement of the resin supply nozzle, and in this case, the resin is always supplied in a constant amount regardless of the beginning, middle, end, etc. Therefore, it is possible to obtain a resin tube having a uniform wall thickness over the entire length.

Hereinafter, one embodiment of the present invention will be described based on the drawings. Reference numeral 1 has a cylindrical shape having end face jigs 2 at both ends, and is supported by a plurality of wheels 3 so as to be rotatable around a horizontal axis 4 . Reference numeral 5 denotes a cart that can move forward and backward while being guided by rails 6, and a resin supply nozzle 8 is attached to the tip of a cylindrical rod 7 that extends from the front surface of the cart so as to be positioned on the horizontal axis 4. 9 is a cylinder device consisting of a cylinder 10, a piston 11, and a piston rod 12;
It is inclined at a predetermined angle θ so that the protruding side of No. 2 is at the lower side. The upper end side of the cylinder chamber 13 is connected to the resin tank 1 via a one-way valve 14 and a pump 15.
6, and the lower end side communicates with a discharge passage 17 formed within the piston rod 12. The outer end of the discharge passage 17 communicates with a supply hose 19 via a one-way valve 18, and the supply hose 19 is connected to the resin supply nozzle 8 via a supply passage 20 formed from the truck 5 to the cylindrical rod 7. is connected to. The truck 5 and the piston rod 12 are connected by connecting rods 21 and 22.
The entire cylinder device 9 is arranged so that as the resin supply nozzle 8 moves forward, the cylinder device 9 contracts.

In the figure, the resin supply nozzle 8 faces the inner surface of the starting end of the cylindrical mold 1, and the cylinder device 9 is extended to fill the cylinder chamber 13 with a sufficient amount of resin 23. In this state, when the resin supply nozzle 8 is moved forward by the running of the trolley 5, the piston rod 1 is
2 moves in the contraction direction, and the piston 11 moves and is compressed into the cylinder chamber 13. At this time, since backflow is prevented by the one-way valve 14, the resin 23 is supplied into the cylindrical mold 1 from the resin supply nozzle 8 via the discharge path 17, the supply hose 19, and the supply path 20. This resin 23 is supplied in a constant amount. When the truck 5 moves backward, the piston rod 12 is gradually extended, and the resulting negative pressure in the cylinder chamber 13 and the pressurization by the pump chamber 15 cause the resin 23 in the resin tank 16 to be drawn into the cylinder chamber 13. will be supplied.

By tilting the cylinder device 9, air mixed into the cylinder chamber 13 gathers at the upper end of the tilt, thereby preventing the air from being forced out.
Furthermore, by providing the pump 15 on the press-fitting side,
The inclusion of air bubbles can be reduced.

By reversing the direction of the cylinder device 9 in the figure, the resin 23 can be removed when the resin supply nozzle 8 is removed.
can be supplied. In addition, by arranging a pair of cylinder devices 9 with different directions, the resin supply nozzle 8
The resin 23 can be supplied both during insertion and removal.

According to the resin supply method in centrifugal molding of the present invention described above, resin can be automatically supplied in conjunction with the movement of the resin supply nozzle, and at that time, the resin supply can be performed at the start, middle, and end. It can be done in a constant amount regardless of the time, and therefore a resin tube with a uniform wall thickness over the entire length can be obtained. Further, since the cylinder device is extended in conjunction with the reverse movement of the resin supply nozzle, the resin can be automatically sucked into the cylinder chamber.

[Brief explanation of the drawing]

The drawings are explanatory diagrams showing one embodiment of the present invention. 1...Cylindrical shape, 4...Horizontal axis, 5...Dolly, 7
... cylinder rod, 8 ... resin supply nozzle, 9 ... cylinder device, 10 ... cylinder, 11 ... piston,
12...Piston rod, 13...Cylinder chamber,
21, 22...Connecting rod, 23...Resin.

Claims (1)

[Claims] 1. In centrifugal molding having a cylindrical mold rotatable around a horizontal axis and a resin supply nozzle movable within the cylindrical mold along the horizontal axis, the resin supply nozzle contracts in conjunction with movement of the resin supply nozzle. A resin supply method in centrifugal molding in which a cylinder device pressure-feeds resin liquid in a cylinder chamber to the resin supply nozzle.