JP2000084940A - Apparatus for molding electrically fused joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for molding an electrically fused joint having a terminal pin guide means which can guide terminal pins at both ends of a heating wire surely into the pin holes of the terminal pin guide means. SOLUTION: A terminal pin guide means 9 for guiding terminal pins 8 to the terminal pin holding member 4 of a molding mold when a primary molding 5 in which a heating wire fitted with the terminal pins 8 at both ends is wound is inserted into the molding mold is provided. The means 9 has opening/closing members 10 of a pair which are opened/closed by an opening/closing deriving means 11, a guide hole half part for forming a terminal pin guide hole 13 having a conical inner circumferential surface in which the terminal pin side is expanded and the terminal pin holding member side is contracted is formed in each opening/closing member 10, and a moving means 12 for moving the opening/ closing members 10 to a terminal pin guide position and a turnout position outside the molding mold is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding apparatus for an electric fusion joint, and more particularly, to a terminal pin holding member provided in a molding die when injection molding an electric fusion joint in which a heating wire is embedded. Further, the present invention relates to an electrofusion joint forming apparatus provided with guide means for inserting terminal pins at both ends of a heating wire.

[0002]

2. Description of the Related Art As a method of manufacturing an electric fusion joint used for connecting a synthetic resin pipe, a heating wire is wound around an outer periphery of a previously molded primary molded product, and terminal pins are attached to both ends thereof. After that, it is inserted into a molding die (outer die) to injection-mold the outer peripheral portion of the joint.

At this time, the terminal pins are inserted and held in the pin holes at the ends of the terminal pin holding members provided in the molding die. Therefore, when inserting the primary molded product into the molding die, The terminal pins need to be securely inserted into the pin holes.

[0004]

However, when the primary molded product is automatically inserted into the molding die by a robot or the like, if the terminal pins are inclined due to the tension of the heating wire, etc.
The trouble that the terminal pin does not enter the pin hole occurs. When such a trouble occurs, the operation of the molding apparatus must be temporarily stopped, which causes a decrease in productivity.

Therefore, the present invention provides an apparatus for forming an electro-fusion joint having terminal pin guide means capable of securely guiding a terminal pin into a pin hole of a terminal pin holding member even if the terminal pin is slightly inclined. It is intended to provide.

[0006]

In order to achieve the above object, an apparatus for forming an electric fusion joint according to the present invention comprises: a primary molded article having a heating wire wound with terminal pins mounted at both ends; In the molding apparatus for molding the outer peripheral portion of the electrofusion joint by inserting the terminal pin into the molding die, the terminal pin is guided by a terminal pin holding member provided in the molding die. Terminal pin guide means, the terminal pin guide means has a pair of opening and closing members opened and closed by opening and closing driving means, the opening and closing members,
A guide hole for forming a terminal pin guide hole having a conical inner peripheral surface in which the terminal pin side is enlarged in diameter and the terminal pin holding member side is reduced in diameter in a contact portion when both opening and closing members are closed, respectively. And a moving means for moving the opening / closing member between a terminal pin guide position and a retracted position outside the molding die.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of an apparatus for forming an electrofusion joint according to the present invention. FIG. 1 is a front view of the apparatus, FIG. 2 is a sectional view taken along the line II-II of FIG. FIG. 3 is a sectional view of a main part, FIG. 4 is a front view showing a state in which an opening / closing member is closed, and FIG.
FIG. 4 is a front view showing a state where the opening / closing member is opened.

First, an apparatus for forming an electrofusion joint includes a fixed mold 1 and a movable mold 2 constituting a molding die, a core support member 3 and a terminal pin holding member 4 provided on the movable mold 2,
An unloader 7 for gripping the core 6 holding the primary molded product 5 and inserting it into the molding die, and guiding the terminal pins 8 mounted on the primary molded product 5 to the terminal pin holding member 4. Terminal pin guide means 9.

The core supporting member 3 protrudes from the movable mold 2 when the primary molded product 5 is inserted and when the molded product is taken out.
The terminal pin holding member 4 moves together with the core supporting member 3 to hold the terminal pin 8 when the primary molded product 5 is inserted. Thus, at the time of the injection molding in which the fixed mold 1 and the movable mold 2 are closed, the movable mold 2 is pulled into the movable mold 2.

The unloading machine 7 moves by grasping both ends of the core 6 by a pair of opening and closing arms 7a. When the primary molded product 5 is inserted, the core supporting members 3 are provided at both ends of the core. When the arm enters the supporting hole, the opening / closing arm 7
The core 6 is transferred to the molding die side by opening a and pushing out the pushing pin 7c by the cylinder 7b. In addition, the molded product is formed so that both ends of the core 6 extruded from the movable mold 2 by the core supporting member 3 are gripped by the opening / closing arm 7a and are taken out from the molding die.

The terminal pin guide means 9 comprises two terminal pins 8,
8, a pair of opening and closing members 10, 1 provided corresponding to the positions
0, opening and closing drive means 11 for opening and closing the opening and closing members 10, 10, and moving the opening and closing drive means 11 to move the opening and closing members 10, 10 to a terminal pin guide position shown by a solid line in FIG. 1 has moving means 12 for moving to a retracted position outside the molding die indicated by imaginary lines. A chuck cylinder 11a that supports a base of the opening / closing member 10 is used as the opening / closing drive unit 11, and the moving unit 12 is formed by combining a horizontal cylinder 12a and a vertical cylinder 12b. In addition, as the opening / closing drive means 11 and the movement means 12, an appropriate one using a cylinder, a motor, or the like as a drive source can be used.

At the leading end of the opening and closing members 10, 10, a contact portion when the opening and closing members 10, 10 are closed has a conical shape in which the diameter of the terminal pin 8 is increased and the diameter of the terminal pin holding member 4 is reduced. Guide hole halves 13a, 13a for forming terminal pin guide holes 13 having an inner peripheral surface are provided respectively. Further, on the terminal pin holding member 4 side of the terminal pin guide hole 13, there is provided a tubular portion 14 for sandwiching the tip of the terminal pin holding member 4.

The terminal pin holding member 4 side of the terminal pin guide hole 13 is reduced in diameter to near the diameter of the terminal pin 8.
The opening / closing member 10 is closed, and the terminal pin holding member 4 is
Are formed so that the axis of the terminal pin guide hole 13 and the axis of the terminal pin holding member 4 are located on a straight line when the tip of the terminal pin is sandwiched.

When inserting the primary molded article 5 into the molding die, the terminal pin guide means 9 first moves to the terminal pin guide position with the opening / closing member 10 opened, and then,
The opening / closing member 10 is closed so that the distal end of the terminal pin holding member 4 is sandwiched between the tubular portions 14. As a result, the terminal pin guide hole 13 is positioned coaxially immediately before the pin hole 4a of the terminal pin holding member 4.

In this state, when the primary molded product 5 and the terminal pin holding member 4 come relatively close to each other, the terminal pin 8 is guided by the conical surface of the terminal pin guide hole 13 so that the end of the terminal pin 8 is moved. And finally the pin hole 4a
To enter. Therefore, even if the terminal pin 8 is slightly inclined, the terminal pin guide hole 13 can surely guide the terminal pin 8 into the pin hole 4a.

Then, as shown in FIG. 3, when the tip of the terminal pin 8 enters the pin hole 4a, the opening / closing member 10 is opened, and the moving means 12 is operated to move the opening / closing member 10 to the retracted position. . After that, as in the conventional case, the unloader 7
After transferring the core 6 to the core supporting member 3 and moving the unloader 7 to a predetermined position, the primary molded product 5 held by the core 6 is sandwiched between the fixed mold 1 and the movable mold 2 and is inserted into the molding die. In this case, the outer periphery of the joint may be formed on the outer periphery of the primary molded product 5 by injecting a resin.

The terminal pin guide hole 13 and the pin hole 4a
Can be adjusted by other position regulating means. Further, as the moving means 12, the opening / closing member 10 can be formed so as to be widely opened and retracted from the molding die.

[0018]

As described above, according to the apparatus for forming an electro-fusion joint of the present invention, even if the terminal pin is inclined, the terminal pin guide means having the terminal pin guide hole can be inserted into the pin hole of the terminal pin holding member. Guides can be reliably provided.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a forming apparatus for an electrofusion joint.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view of a main part.

FIG. 4 is a front view showing a state in which an opening / closing member is closed.

FIG. 5 is a front view showing a state where an opening / closing member is opened.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fixed type, 2 ... Movable type, 3 ... Core support member, 4 ... Terminal pin holding member, 5 ... Primary molded product, 6 ... Core, 7 ... Unloader, 8 ... Terminal pin, 9 ... Terminal pin guide means, 10 opening / closing member, 11 opening / closing driving means, 12 moving means, 13 ...
Terminal pin guide hole, 14 ... cylindrical part

Claims (1)

[Claims] 1. A molding apparatus for molding an outer peripheral portion of an electro-fusion joint by inserting a primary molded product wound with a heating wire having terminal pins attached to both ends into a molding die, wherein the primary molded product is formed. Terminal pin guide means for guiding the terminal pin to a terminal pin holding member provided on the mold when the mold is inserted into the mold, and the terminal pin guide is operated by opening and closing drive means. A conical inner peripheral surface having a pair of opening and closing members that are opened and closed, wherein the opening and closing member has a contact portion when both opening and closing members are closed, and the terminal pin side is enlarged in diameter and the terminal pin holding member side is reduced in diameter. A guide hole for forming a terminal pin guide hole having a movable portion, and a moving means for moving the opening / closing member between a terminal pin guide position and a retracted position outside the molding die. Electrofusion characterized by the following: Equipment for forming joints.