JPH0133304Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a centrifugal molding device for resin pipes with sockets.

Conventionally, a centrifugal molding device of the type has been equipped with a rotary mold having an inner surface for molding a body and an outer molding surface for a socket, and an end surface having a molding surface for a socket end face and an inner molding mold surface for the socket at one end of the rotary mold. A configuration in which the jig is detachably provided is provided. According to this method, after centrifugally molding a resin pipe with a socket, the end jig was first removed, and the resin pipe was removed from the rotary mold by pulling it out toward the side where the end jig was attached. However, in demolding, the resin tube, whose entire outer surface is in close contact with the rotary mold, must be extruded from the side opposite to the side where the end jig is attached, and the extrusion force acts to expand the diameter of the resin tube. I couldn't do it easily because I had to do it.

An object of the present invention is to provide a centrifugal molding apparatus for a resin pipe with a receptacle, which allows the resin pipe to be easily removed from the mold by drawing it out.

In order to achieve the above object, the centrifugal molding apparatus for a resin pipe with a socket in the present invention has a large-diameter part formed at one end of a rotary mold having an inner surface for molding the body, and a part that can be fitted and removed from the outside into the large-diameter part. A socket mold is provided, and a socket outer molding surface and a communication part molding surface extending from the socket outer molding surface to the body molding inner surface are formed on the socket mold, and the socket mold can be freely fitted and removed from the outside. A socket end face mold is provided, and a socket inner face mold is provided which is slidably fitted into the socket end face mold.

According to the configuration of the present invention, after molding the resin pipe with a socket, first, the socket end face mold and the socket inner surface mold are removed, and then when the socket mold is pulled out and moved, the portion forming the connecting part molding surface is removed. Since it is engaged with the connecting portion of the resin pipe, the resin pipe can be removed from the mold by being pulled out.

An embodiment of the present invention will be described below based on the drawings. 1 is a cylindrical rotating type, and is rotatable around a horizontal axis 3 via a plurality of wheels 2. This rotary mold 1 has a straight body molding inner surface 4, and has a large diameter portion 1A formed at one end and a spigot end molding surface 5 at the other end. 6 is the large diameter portion 1A
An outer cylindrical portion 6 that is an annular socket mold that can be freely fitted and removed from the outside to the large diameter portion 1A.
A, an inner cylindrical portion 6B that can be fitted and removed from the inside, and a connecting portion 6C that connects both cylindrical portions 6A and 6B and can freely come into contact with the end surface of the large diameter portion 1A. The inner end surface of the inner cylindrical portion 6B is in contact with the stepped inner surface of the large diameter portion 1A,
At this time, an O-ring 7 for sealing is located. Further, the inner cylindrical portion 6B is formed with a receptacle outer molding surface 8 and a communication portion molding surface 9 extending from the receptacle outer molding surface 8 to the body molding inner surface 4. In order to form this communication portion molding surface 9, the inner end of the inner cylinder portion 6B protrudes inward, and this protrusion becomes the engaging portion 6b. A connecting device 10 is provided between the outer cylinder portion 6A and the large diameter portion 1A.
will be provided. That is, radially slidable locking pins 11 are disposed at a plurality of locations in the circumferential direction of the outer cylinder portion 6A so as to protrude from both the inner and outer surfaces, and the locking pins 11 are biased to protrude outward. A spring 12 is provided, and a recess 13 in which the locking pin 11 protruding inward can freely engage is provided on the outer surface side of the large diameter portion 1A.
Reference numeral 14 denotes an annular socket end face mold that can be fitted into and removed from the socket mold 6 from the outside. The cylindrical portion 14B, both cylindrical portions 14A,
and a communication section 14C that communicates with the communication section 14B. A part of the communication part 14C contacts the communication part 6C of the socket mold 6 from the outside, and also contacts the inner cylinder part 14B.
The inner end surface becomes the socket end surface molding surface 15. Reference numeral 16 denotes a socket inner surface molding die which is slidably fitted into the socket end surface molding die 14, and the outer surface of the inner side thereof becomes the socket inner surface molding surface 17. Further, recesses 18 and 19 are formed in the intermediate part and the outer end, respectively, and these recesses 1
8 and 19, and a spring 2 that biases the fitting.
1 is provided. 22 is a resin pipe, which has a socket 22B at one end via a communication part 22A and a spigot 22C at the other end.

The action will be explained below.

First, as shown in FIG. 1, the rotary mold 1 is placed on the wheel body 2. At this time, as shown by the solid line in FIG. 2, the rotary mold 1 has a socket mold 6 fitted from the outside into its large diameter portion 1A, and a socket end face mold 14 is fitted into the socket mold 6 from the outside. It is fitted from the outside.

At that time, the outer cylindrical portion 14A of the socket end face mold 14
acts on the locking pin 11, causing the locking pin 11 to move inward against the spring 12 and engage with the recess 13. This allows the socket mold 6 to be connected to the connecting device 10.
It is connected to the large diameter portion 1A by. Further, the socket inner surface mold 16 is in an ejection position relative to the socket end surface mold 14, and the ball 20 is located in the recess 18 at that position.
It is determined by the fit. As a result, the inside of the socket outer molding surface 8 is in an open state. In this state, while rotating the rotary mold 1, resin is supplied onto the outer molding surface 8 of the socket, thereby forming the mold 1 on the socket 2.
Perform centrifugal molding of 2B. Next, as shown by the imaginary line in FIG. 2, the socket inner surface forming die 16 is pushed in, and the ball 20 is engaged with the recess 19 to perform positioning. After that, the resin is supplied toward the molded inner surface 4 of the body, and the connecting portion 22A and the spigot 22 are
The resin tube 22 including C is centrifugally molded.

After the resin tube 22 is cured, the rotation is stopped and the mold is removed. That is, first, as shown in FIG. 4, the socket end face mold 14 and the socket inner surface mold 16 are extracted. At this time, the outer cylinder part 1
4A is pulled out, the locking pin 11 is moved outward by the force of the spring 12, and the connection by the connection device 10 is released.

Thereafter, the socket mold 6 is removed by an extraction device (not shown). At this time, a pulling force acts on the resin tube 22 via the engaging portion 6b that engages with the connecting portion 22A, and this pulling force acts on the body of the resin tube 22 as a diameter reducing force. can be pulled out from the rotary mold 1 as shown in FIG.

According to the configuration of the present invention described above, the following effects can be expected. That is, after molding a resin pipe with a socket, first remove the socket end face mold and the socket inner surface mold, and then pull out and move the socket mold, and the portion of the socket mold that forms the communication part molding surface is removed. Since it is engaged with the connecting part of the resin pipe, a pulling force acts on the resin pipe, and this pulling force acts on the body of the resin pipe as a diameter-reducing force.
The resin pipe can be easily and reliably removed from the mold by drawing it out.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view during centrifugal molding, Figs. 2 and 3 are longitudinal sectional side views of the same essential parts, and Figs. 4 and 5 are during demolding. FIG. DESCRIPTION OF SYMBOLS 1...Rotary mold, 1A...Large diameter part, 3...Horizontal axis, 4...Body molded inner surface, 5...Socket end face molded surface, 6...Socket mold, 6b...Engaging part , 8...
...Socket outer molding surface, 9...Connection part molding surface, 10
... Connecting device, 11 ... Locking pin, 14 ... Socket end surface mold, 15 ... Socket end surface molding surface, 16
... Socket inner surface mold, 17 ... Socket inner surface molded surface, 22 ... Resin pipe, 22A ... Connection part, 22B
...Socket, 22C...Socket.

Claims (1)

[Scope of utility model registration request] A large-diameter portion is formed at one end of the rotary mold having an inner surface for forming the body, and a socket mold that can be freely fitted and removed from the outside is provided in the large-diameter portion. A connecting part molding surface extending from the outer molding surface to the molding inner surface of the body is provided, a socket end molding mold is provided in the socket end molding mold which can be freely fitted and removed from the outside, and the socket end molding mold is slidably inserted into the socket end molding mold. A centrifugal molding device for resin pipes with a socket, characterized in that a mold for molding the inner surface of the socket is provided.