JPH0120097Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a centrifugal molding device having a cylindrical mold rotatable around a horizontal axis and a resin supply nozzle movable within the cylindrical mold along the horizontal axis. be.

Conventionally, in such centrifugal molding equipment, resin was supplied using a pump, and according to this, a small amount of resin was supplied at the start and end of resin supply in the length direction of the cylindrical mold. Therefore, centrifugally molded resin tubes tend to have thin walls at both ends. Further, the amount of resin supplied cannot be easily adjusted.

The present invention aims to solve the above problems.

That is, the present invention provides a centrifugal molding apparatus having a cylindrical mold rotatable around a horizontal axis and a resin supply nozzle movable within the cylindrical mold along the horizontal axis, in which a plurality of pistons are concentrically arranged in the cylinder. An actuating plate is disposed opposite to the outer end of the piston group, the actuating plate is inserted in a superimposed manner on top of the piston group, communicates the discharge port of the cylinder with the resin supply nozzle, and moves in conjunction with the resin feed nozzle, and the actuating plate The present invention proposes a resin supply device for a centrifugal molding apparatus, in which a plurality of types of booster plates are replaceably attached to the resin feeder, and the number of contacting plates of the booster plate with respect to the piston group can be changed.

According to this configuration, resin can be automatically supplied in conjunction with the movement of the resin supply nozzle, and at this time, the resin is always supplied in a constant amount regardless of whether it is at the start, middle, end, etc. Therefore, it is possible to obtain a resin tube having a uniform wall thickness over the entire length. Furthermore, by changing the number of contacting plates against the piston group by replacing the backing plate, the amount of resin supplied per one operation can be easily adjusted.

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 into which a plurality of pistons are inserted concentrically and overlapping each other. That is, although the pistons shown here include a central rod-shaped piston 10A and three cylindrical pistons 10B, 10C, and 10D that fit around the central rod-shaped piston 10A, the number of cylindrical pistons can be determined arbitrarily. . A discharge port 11 is formed on the opposite side of the cylinder 9 from the piston group insertion side, and this discharge port 11
is in communication with the resin supply nozzle 8 via a supply hose 22 having a one-way valve 12 and a supply path 13 formed from the truck 5 to the cylindrical rod 7 . In addition, the suction port 14 near the discharge port 11 is connected to the one-way valve 1
5 and a pump 16 to communicate with a resin tank 17. An operating plate 1 is attached to the arm rod 18 from the truck 5.
9 is attached, and this actuating plate 19 faces the outer end of the rod-shaped piston 10A and moves in conjunction with the resin supply nozzle 8. Said actuating plate 1
9 has multiple types of booster plates 20 on the front of the bolts 21.
The piston group 10A of the backing plate 20 can be replaced by replacing the
The number of contacts for ~10D can be changed.

In the figure, the resin supply nozzle 8 faces the inner surface of the starting end of the cylinder 1, and the piston groups 10A to 1
0D protrudes by the maximum amount, and the backing plate 20 is in contact with its outer end surface. Here is the boost board 20
is attached to a rod-shaped piston 10A and two cylindrical pistons 10B and 10C. Further, the inside of the cylinder 9 is filled with resin 23. In this state, when the resin supply nozzle 8 is moved forward by the running of the trolley 5, the backing plate 20 is moved forward via the arm rod 18 and the actuating plate 19 in conjunction with the forward movement, and the pistons 10A, 1
0B and 10C rush into the cylinder 9. At this time, a reaction force acts on the cylindrical piston 10D, but this is prevented from being pulled out by a stopper structure (not shown). Piston 10A, 10
The interior of the cylinder 9 is compressed by the advancement of B and 10C, and at this time, the one-way valve 15 prevents backflow, so the resin 23 is transferred from the resin supply nozzle 8 to the cylindrical mold 1 via the supply hose 22 and the supply path 13. It will be supplied within the country. The resin 23 is supplied in proportion to the amount of movement of the truck 5. The cylinder 9 is replenished with the resin 23 by operating the pump 16. At this time, the backing plate 20 is retreating together with the truck 5, and the pistons 10A, 10B, 10C gradually protrude as a result of replenishment.

In the figure, cylinder 9 and piston group 10A~
By reversing the direction of 10D, the resin 23 can be supplied when the resin supply nozzle 8 is extracted. In addition, by arranging a pair with different directions, the resin 23 is
can be supplied.

According to the resin supply device of the centrifugal molding apparatus according to the present invention described above, resin can be automatically supplied in conjunction with the movement of the resin supply nozzle, and in this case, the resin supply is performed at the start, at the intermediate time, and at the intermediate time. It can be done in a constant amount regardless of when it is finished, so it is possible to obtain a resin tube with a uniform wall thickness over the entire length. Furthermore, by changing the number of contacting plates against the piston group by replacing the backing plate, the amount of resin supplied per one operation can be easily adjusted.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an explanatory view, and FIG. 2 is a sectional view taken along line A-A in FIG. 1. 1...Cylindrical type, 4...Horizontal axis, 5...Dolly, 8
...Resin supply nozzle, 9...Cylinder, 10A...
...rod-shaped piston, 10B, 10C, 10D...
...Cylindrical piston, 11...Discharge port, 16...Pump, 17...Resin tank, 18...Arm rod, 19...
... Actuation plate, 20... Backing plate, 23... Resin.

Claims (1)

[Scope of utility model registration request] In a centrifugal molding device having a cylindrical mold rotatable around a horizontal axis and a resin supply nozzle movable within the cylindrical mold along the horizontal axis, a plurality of pistons are concentrically superposed on the cylinder. an actuating plate that is inserted and communicates the discharge port of the cylinder with the resin supply nozzle, moves in conjunction with the resin supply nozzle, and is disposed opposite to the outer end of the piston group; 1. A resin supply device for a centrifugal molding apparatus, characterized in that a plate is attached in a replaceable manner so that the number of contacts of the booster plate with respect to the piston group can be changed.