JPS6127728Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the structure of a core mold for manufacturing bendable pipe joints using reinforced plastic materials, and in particular, both or one of the connection openings of the bendable pipe joint has an expanded diameter receiving ring with intervening ring packing. This is a core mold for a bent pipe joint consisting of a spout, and the core mold is simply constructed and can be easily assembled and demolded.

In general, for pipe fittings molded from reinforced plastic materials, a reinforced plastic layer is formed alone on the core mold, or a reinforced plastic layer is used as an inner layer and a mortar layer of resin mortar or concrete is formed on the outer layer. There are also known manufacturing methods in which a reinforcing plastic layer is further formed on the outer layer, or a reinforcing reinforcing wire is wound so as to be embedded in these layers. On the other hand, some pipe joints are manufactured to be bent at various angles, and the pipe connection opening is composed of a socket and an inlet, or both are constructed with a socket or an inlet, respectively. In addition, as a socket, an enlarged diameter socket is used so that the bending of the pipe line that occurs due to ground subsidence at the piping location can be absorbed at the joint socket, and generally the inner diameter of the socket is A gap is formed on the outer periphery of the insertion tube, and an elastic ring packing is provided in this gap to prevent deterioration of sealing performance due to the bending. On the other hand, in packing, the outer circumferential portion is often fitted into an inner circumferential groove formed in the enlarged diameter socket. Under these circumstances, it is desired that the socket of the bent pipe joint has an enlarged diameter socket.

By the way, when molding an enlarged diameter socket, since the packing fitting inner circumferential groove becomes an undercut part, it is necessary for the core mold for molding to be able to be released by reducing the diameter or retracting inward. A core mold for molding has been proposed. The present applicant had previously proposed a core mold for manufacturing branch pipe joints consisting of an enlarged diameter socket, but it could only be used for forming the enlarged diameter socket of straight pipes or branch pipes, and it was designed specifically for bent pipe joints. It became necessary to develop a core mold.

The present invention was arrived at as a result of intensive research based on the above, and is an attempt to provide a core mold that can form a bent pipe joint that constitutes an expanded diameter socket using a simple combination of core molds. However, with this invention, the core shape of the curved part excluding the straight pipe part for connection is provided with core shafts protruding from both end faces, and
A core shaft attachment type with one side of the end face being a joint surface orthogonal to the core axis, and a core shaft passing through and abutting the other side of the core axis attachment type, and the opposite side being the core type. It has a combination configuration with an auxiliary core mold whose joint surface is orthogonal to the axis, and one end of the divided piece of the combined expanded diameter socket molding core mold consisting of a plurality of divided pieces is moored to at least one side joint surface of the combined core mold. Both inner ends of the divided pieces are supported by hourglass-shaped holding members that are inserted into the core shaft and have support flanges formed on both ends, and the flanged presser lid that covers the outer periphery of the tip of each divided piece is attached to the core. It is constructed by fastening with a tightening screw that passes through the shaft and is threaded onto the tip of the core shaft.

The structure of the core mold for manufacturing bent pipe joints of the present invention will be explained in detail below based on the drawings. Depending on the case, one example of the opening may be configured as a socket core type or simply a socket core type. Fig. 1 is a plan view of a reinforced plastic bent pipe joint 1 manufactured by the core mold of the present invention, bent at 90 degrees with enlarged diameter sockets on both sides 1, and Fig. 2 is a side view thereof, showing both openings. Expanded diameter socket 2,
2a, and its middle part is bent to form a body part 3. FIG. 3 is a side view showing the state in which the core mold 4 of the present invention is assembled and attached to a rotating device. The core molds 6, 6 for forming the expanded diameter socket are assembled on both ends thereof, and the rotation support shafts 7, 6 are attached on both ends thereof, respectively.
The core mold 4 is attached to mounting seats 7a, 7a fixed to the core mold 4, and both or one of the rotation support shafts 7, 7 is connected to a drive device (not shown) that positively rotates, thereby swinging and rotating the entire core mold 4. After wrapping a reinforced plastic molding material around the outer periphery of the core mold, the molding material is cured to manufacture the bent pipe joint 1. Figure 4 is a sectional view taken along the cutting line - of Figure 3 in the direction of the arrow;
The figure is a left side view of FIG. 3, and FIG. 6 is a sectional view taken along the cutting line - in FIG. 9
and a substantially trapezoidal auxiliary core mold 10 on one side of the contact surface.
The core shafts 8, which maintain an angle of 90 degrees to each other, are formed on both end surfaces of the core shaft mounting mold 9.
8 is provided to match the axis line of the core shaft mounting mold 9. When installing the core shaft 8, as shown in the figure, threaded holes are formed in the pipe wall of the mounting mold 9, and the threaded shaft portions formed on the base sides of each of the core shafts 8 are screwed into the screw holes. Although it is recommended that they be implanted, they may also be secured by welding or other means of construction. One side (the left side in the figure) of the core shaft mounting mold 9 is a joint surface 9a that is perpendicular to the core shaft 8, and the joint surface 9a is a core mold for expanding the diameter socket (hereinafter simply referred to as the diameter expansion core), which will be described later. 6 engagement steps (referred to as molds) are formed. Further, the auxiliary core mold 10 arranged so as to abut on the other side contact surface of the core shaft mounting mold 9 forms a core shaft through hole 10b and a joint surface 10a on the opposite side to the contact surface. The joint surface 10a is arranged perpendicularly to the core axis 8 to form an engaging stepped portion of the expanded core mold 6. Although not shown in the drawings, it is recommended that an engagement step be formed on the abutting surfaces of the core shaft mounting mold 9 and the auxiliary core mold 10 so as to correctly position them. It is also recommended that threaded portions 8a be formed on the distal ends of the core shafts 8, 8, respectively, and that wrench hook portions 8b be formed on these distal ends. Further, in the figure, the wrench hook portion 8b is shown as having an oval track-like shape, but it may be formed into a square shape, a hexagonal screw head, or an engaging recess. Further, if necessary, when inserting both or one of the core shafts 8 into the mounting seat 7a, a four corner portion may be formed on the circumferential surface of the core shaft 8 so that the core shaft 8 does not rotate. Alternatively, the insertion hole of the mounting seat 7a may be a square hole, or a key may be provided.

On the other hand, the diameter-expanding core mold 6 is composed of divided pieces that can be retracted in the diameter-reducing direction and removed from the mold, as shown in FIG. It shows. That is, by moving the divided piece 6a in the direction of the core axis 8, the support for 6b and 6d is released, and then 6c can also be released, allowing each to be moved in the axial direction and removed from the mold. On the other hand, engagement step portions 6e are provided on the rear end sides of these divided pieces 6a to 6d, respectively.
(Fig. 7), and the locking step 6e is connected to the joint surfaces 9a, 1 of the core shaft mounting mold 9 and the auxiliary core mold 10.
It is assembled by fitting into the engagement stepped portion formed into 0a. When assembling the expanded core mold 6, a holding member is used that supports each of the divided pieces 6a to 6d from the inside. That is, as the holding member, a drum-shaped holding member 11 formed to support the inside of each of the inner side and the tip side of the divided pieces 6a to 6d is incorporated. That is, as shown in FIG. 7, the drum-shaped holding member 11 is integrally formed with a cylindrical shaft portion 11a that can be inserted into the core shaft 8, and support flange portions 11b and 11c on both ends thereof, and the flange portion 11b is divided into two parts. Piece 6a
~ 6d, the flange portion 11c is the divided piece 6a
The distal end sides of ~6d are abutted and supported by their inner surfaces, respectively. Further, since the distal ends of the divided pieces 6a to 6d are not restricted in the outer circumferential direction, the flanged presser lid 12 is used to restrict this. A flange portion 12a is formed at the end of the holding lid 12, and a through hole 12b is formed at the center of the lid plate portion. When assembling, as shown in FIG. 6, insert the core shafts 8, 8, and then fit the presser lid 12 on.
A nut 13 is screwed into the tightening screw portions 8a, 8a through the insertion hole of the mounting seat 7a of the support shaft 7, and then tightened. Each of the support shafts 7 is attached to a suitable rotary drive device (not shown), and the core mold 4 is rotated to wrap and harden the reinforced plastic molding material. The molding material is the flange portion 12a of the presser lid 12.
Wrap it around core mold 4 except for. To remove the mold after molding, first remove the nut 13 and remove the core shaft 8 from the support shaft 7, then remove the presser lid 12 and the hourglass-shaped holding member 11 as shown in FIG. As a result, the support for the divided pieces 6a to 6d is released, so the divided pieces 6a to 6d are sequentially taken out from the molded diameter expansion socket 2 according to the above procedure, and then the auxiliary core mold 10 is unscrewed from the socket 2 as shown in the figure. (Other side socket 2a
Do the same thing). For this extraction, the hook is passed through the core shaft through hole 10b and pulled out. Next, the core shaft attachment core mold 9 is rotated out in the direction of arrow A, just as the core shafts 8, 8 are attached, as shown in FIG.
If necessary, it can be removed from the mold by unscrewing it in the opposite direction or by unscrewing the molded bent pipe joint 1, for example, as shown by the dashed line arrow.

Since the core mold for manufacturing a bent pipe joint of the present invention is constructed in this manner, the bent pipe joint can be easily formed, and the core mold is also simply constructed and can be easily assembled and demolded. Furthermore, molded products with excellent precision can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the bent pipe joint, Fig. 2 is a right side view of Fig. 1, Fig. 3 is an assembled side view of the core mold of the present invention, and Fig. 4 is an arrow of the cutting line - in Fig. 3. 5 is a right side view of FIG. 3, FIG. 6 is a central sectional view along the cutting line - of FIG. 5,
FIG. 7 is an explanatory diagram for demolding, showing only one side, and FIG. 8 is also an explanatory diagram for demolding. DESCRIPTION OF SYMBOLS 1... Bent pipe joint, 2... Expanded diameter socket, 3... Bent body, 4... Core mold for forming, 5... Bent body core mold, 6... Expanded diameter core mold, 7... ...Support shaft, 8... Core shaft, 9... Core shaft attachment core type, 10... Auxiliary core type, 1
1... drum-shaped holding member, 12... presser lid, 13...
Natsuto.

Claims (1)

[Scope of utility model registration request] A core mold for manufacturing a reinforced plastic bent pipe joint in which the pipe connection opening on one or both sides is an enlarged diameter socket with a ring packing interposed therein, the core mold comprising:
A core shaft in which a core shaft of the curved portion excluding the straight pipe portion for connection is provided with a core shaft protruding from both sides, and one of the end faces of the core mold is a joint surface perpendicular to the core shaft. The combination core is constructed by combining a mounting core type and an auxiliary core type in which the core shaft passes through and abuts on the other side of the core shaft attachment core mold, and the opposite side is a joint surface orthogonal to the core axis. One end of a divided piece of a core mold for forming an expanded diameter socket is moored to at least one joint surface of the mold, and both inner ends of the divided piece are inserted into the core shaft, and both ends of the divided piece are inserted into the core shaft. It is supported by a drum-shaped holding member formed with a supporting flange, and a flanged presser cover that covers the outer periphery of the tip of each divided piece is passed through the core shaft and fastened by a tightening screw threaded onto the tip of the core shaft. A core mold for manufacturing reinforced plastic bent pipe joints, characterized by the following structure: