JP2535521Y2 - Injection molding equipment for resin pipe - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a resin pipe receiving port forming apparatus for forming a pipe connecting port in a resin pipe.

[0002]

2. Description of the Related Art In a resin pipe such as a hard vinyl chloride pipe, a pipe end is formed by expanding the diameter of the pipe end and forming an annular groove for mounting a rubber ring on an inner peripheral surface thereof. Mouth forming has been done.

As an apparatus for forming such a receiving port into a resin tube, for example, as described in Japanese Patent Publication No. 54-40111, a core mold in which the end of the resin tube is fitted, A split outer mold provided with a concave groove in the inner peripheral surface direction covering the end of the resin tube, and when housed in the above core mold and expanded, the outer periphery protrudes outward from the outer periphery of the core mold to form an outer periphery. 2. Description of the Related Art There has been known an apparatus including a split mold having a plurality of segments which are formed so as to form a continuous protrusion in a circular shape and are divided so as not to protrude outward from an outer periphery of a core when contracted.

In the above apparatus, since it takes time to fit the split die to the pipe end of the resin pipe, instead of using the split die, it is sucked from the core side and the outer peripheral surface of the core die and the inside of the resin pipe. There is a case where the pressure between the outer peripheral surface and the inner peripheral surface is reduced to bring the inner peripheral surface of the resin pipe into close contact with the outer peripheral surface of the core mold.

As shown in FIG. 3, as shown in FIG. 3, a plurality of segments 21 each having two types of shapes (only one type in FIG. Is shown), which protrudes outward from the outer periphery of the core mold 1 when it is enlarged, and forms a protruding portion whose outer periphery is continuous in a circular shape. In the point that it does not protrude outward,
The gauge is the same as the apparatus described in Japanese Patent Publication No. 54-40111. Of course, there is no split type.

The mechanism for expanding and contracting the segment 21 of the split mold 2 is the same as that of the device described in Japanese Patent Publication No. 54-40111.
Is mounted slidably on the inclined surface 41 of the cone 4 attached to the tip of the movable rod 3 provided therein, and as the rod 3 reciprocates in the axial direction of the core mold 1, the segment 21 becomes conical. It slides on the inclined surface 41 of the body 4 and reciprocates in the radial direction of the core mold 1 to enlarge.
It is designed to shrink.

[0007] When the segment 21 slides on the inclined surface 41 of the cone 4 and reaches the upper part thereof, the outer periphery thereof continuously forms a circular shape to form a protruding portion. The moving rod 3 is driven by an air cylinder (not shown) to reciprocate.

Reference numeral 5 denotes an intake pipe, which is bored in the core mold 1 and connected to an intake hole 51 leading to a portion where the split mold 2 is housed, and the other end is connected to a vacuum pump (not shown). Reference numeral 52 denotes an electromagnetic valve that opens and closes the intake pipe 5.

In forming a socket in a resin pipe by this apparatus, first, the pipe end (heated and softened) of the resin pipe is fitted to the core mold 1. Next, the moving rod 3 is advanced (moved to the left in the drawing). With this advance,
The segment 21 slides on the inclined surface 41 of the cone 4 and moves upward. As a result, the segment 21 protrudes outward from the outer peripheral surface of the core die 1, and the outer peripheral surface has a circularly continuous protrusion. Form.

At this time, when the solenoid valve 52 is opened and the part of the split mold 2 is sucked from the intake pipe 5, the space between the outer peripheral surfaces of the core mold 1 and the split mold 2 and the inner peripheral surface of the resin pipe is reduced in pressure. As a result, the resin tube is brought into close contact with the outer peripheral surfaces of the core mold 1 and the split mold 2, and the tube wall of the resin tube at the portion where the segment 21 abuts is pushed outward to form an annular groove.

After cooling the end of the resin tube by appropriate means,
By moving the movable rod 3 backward, the segment 21 slides down the inclined surface 41 to reduce its diameter, and sinks below the outer peripheral surface of the core mold 1. Thereafter, the resin tube is detached from the core mold 1. Thus, a receiving port having an annular groove formed on the inner peripheral surface is formed.

According to the above-mentioned apparatus, it is possible to form a socket having an annular groove. However, as described above, since the segment 21 has a portion which mechanically folds, the sliding portion slides. In order to improve the performance and smooth operation, it is necessary to periodically supply lubricating oil to those parts. If the lubricating oil runs out, the sliding of the segment 21 becomes worse, and the expansion and contraction operations are not performed smoothly.

[0013] For this reason, conventionally, an operator directly sprays a lubricating oil with a spray gun on the fold of the segment of the port forming apparatus.

[0014]

[Problems to be Solved by the Invention] As described above, when an operator uses a spray gun to spray lubricating oil onto the fold surface, the operator must stick the device to the device, thereby saving labor. It was a big problem from this point of view.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a resin pipe socket forming apparatus capable of supplying lubricating oil to a sliding portion without manual spraying.

[0016]

According to the present invention, there is provided an apparatus for forming a socket for a resin pipe, which comprises a core mold to which a pipe end of the resin pipe is fitted, and a core mold housed in the core mold to be outwardly extended from the core mold when enlarged. The outer periphery constitutes a protruding part that is continuous in a circular shape, and consists of a split mold consisting of a plurality of segments that are divided so as to be located inward from the outer periphery of the core when contracted. In a resin pipe receiving port forming apparatus provided with an intake hole that opens,
A lubricating oil supply pipe is connected to an intake pipe communicating with the intake hole, and lubricating oil is supplied to an operating portion of the segment through the intake pipe.

As the resin tube used in the apparatus of the present invention, there are a case where a resin tube which has been extruded and stored is used, and a case where an extruded and still heated resin tube is used as it is. In the former resin tube, it is necessary to heat and soften the end of the tube.

[0018]

According to the present invention, the approximate shape of the receiving port is formed by fitting the end of the resin tube into the core mold, and
The intake pipe is opened, a negative pressure is applied to the fitting part of the resin pipe from the gap where the split-type segment is provided, and the inner surface of the pipe accurately transfers the shape of the core mold surface, and precise molding is performed. Will be

Further, the lubricating oil is supplied from the supply pipe through the intake pipe to the sliding portion of the core-stored segment. In this way, the lubricating oil is automatically and reliably supplied without the trouble of perforating the lubricating oil supply hole in the core mold.

[0020]

Next, an embodiment of the present invention will be described. FIG.
It is a longitudinal cross-sectional view which shows an example of the socket molding apparatus of a resin pipe. FIG. 2 is a sectional view taken along the line II-II in FIG. However,
While FIG. 1 shows the case where the segment is enlarged, in FIG. 2, the upper half shows the case where the segment is enlarged, and the lower half shows the case where the segment is contracted. In this apparatus, the same parts as those in the conventional apparatus are indicated by the same reference numerals as those in FIG.

In the drawings, reference numeral 1 denotes a core mold which is fitted with an end of a synthetic resin and has a diameter enlarged to a size into which a connected pipe is inserted.
Is a split type. The core mold 1 is divided into a front core mold 11 and a rear core mold 12 so that the split mold 2 can be stored therein, and both are connected by an inner core tube 13. Split type 2 is
It is accommodated and arranged between the front core mold 11 and the rear core mold 12. In the split mold 2, a plurality of segments 21, 21..., 22, 22... Of two kinds of shapes are alternately combined and attached to the tip of a moving rod 3 provided in the core mold 1. It is configured by being slidably mounted on the inclined surface 41 of the conical body 4.

The moving rod 3 is driven by a fluid pressure cylinder (not shown) to reciprocate. When the moving rod 3 moves forward (moves to the left in the drawing), the segments 21, 21,. , 22... Are the inclined surfaces 41 of the cone 4
Is slid up and protrudes outward from the outer periphery of the core mold 1 to form a protruding portion whose outer periphery is continuous in a circular shape (see the upper half of FIG. 2).

At this time, the inclination angle of the inclined surface 41 of the pyramid 4 is larger when one of the segments 21, 21.
.. Begin sliding by sliding on the inclined surface 41 first, and then the other segments 21, 21.
It slides in the form of chasing 2, 22,...
When the moving rod 3 moves backward (to the right in the drawing), it operates in reverse, and the segments 21, 21, 22, 22,... Go down the inclined surface 41 and are inward from the outer peripheral surface of the core mold 1. (See the lower half of FIG. 2).

Reference numeral 5 denotes an intake pipe, which is bored in the core mold 1 and connected to an intake hole 51 communicating with a portion in which the split mold 2 is housed, and the other end is connected to a vacuum pump (not shown). The intake hole 51 passes through the core tube 13, and the segment 21,
, 22 and 22 are opened. The intake pipe 5 is provided with an electromagnetic valve 52 for opening and closing the intake pipe 5. When the segments 21, 21,..., 22, 22. The air between the fitted resin pipe A and the core mold 1 and the split mold 2 is taken in to reduce the pressure.

Reference numeral 6 denotes a lubricating oil supply pipe, to which a solenoid valve 7 and a lubricator 8 for oil supply are connected. Solenoid valve 52
When the intake valve is closed and the intake operation is not performed, by opening the solenoid valve 7, the lubricating oil is pressure-fed from the supply pipe 6 to the intake pipe 5, passes through the intake holes 51, and the segments 21, 21,.
, 22,... Are supplied to the sliding portions.

Next, a description will be given of a method of forming a receiving port in a resin tube using the above-described apparatus.

First, the resin tube A is fitted on the core mold 1 to expand the end of the tube. The resin tube to be fitted may be a tube whose end is heated to be in a softened state, or a resin tube which has been extruded and is still in a softened state.

Next, the moving rod 3 is advanced by a hydraulic pressure cylinder (not shown). As described above, the segments 21, 21, 22, 22,... Of the split mold 2 slide up the inclined surface 41 of the cone 4, project outward from the outer circumference of the core mold 1, and have a circular outer circumference. Is formed, and the tube wall of the resin tube A in contact therewith is pushed outward. At about the same time as the operation of the moving rod 3, the solenoid valve 5 is opened. As a result, the suction pressure is reduced between the surface of the split mold 2 and the pipe wall on which the resin pipe A is fitted, the resin pipe A is sucked by the surface of the split mold 2, and the inner surface thereof has a core shape. The transfer is performed, and the receiving port B having the annular groove C is formed.

After the receiving port B is cooled and solidified, the solenoid valve 5
, The intake is stopped, the moving rod 3 is retracted, and the segments 21, 21..., 22, 22.
1 is lowered and immersed from the outer peripheral surface of the core mold 1. Thereafter, the resin tube A is separated from the core mold 1.

When the solenoid valve 5 is closed, the solenoid valve 7 of the lubricating oil supply pipe 6 is opened. By doing so, the lubricating oil in the lubricator 8 is pressure-fed through the lubricating oil supply pipe 6 by the compressed air, and then the suction pipe 5 and the suction hole 52 of the core mold 1.
Through to the folds of split mold 2.

[0031]

[Effects of the Invention] As described above, the device of the present invention provides:
Refueling is performed automatically and reliably, and lubrication work lubricates the fold surface of the port forming device, eliminating the need for workers to stick to the device, which has a significant effect on labor saving in factories. Was done. Further, since oil is supplied using the conventional intake hole, it is not necessary to separately drill an oil supply hole in a core mold or the like, and the apparatus can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of an apparatus for molding a resin pipe socket according to the present invention.

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

FIG. 3 is a longitudinal sectional view of a conventional resin pipe receiving port forming apparatus.

[Explanation of symbols]

 Reference Signs List 1 core type split type 21, 22 segment 3 moving rod 4 cone 41 inclined surface 5 intake pipe 51 intake hole 5, 7 solenoid valve 6 lubricating oil supply pipe

Claims (1)

(57) [Scope of request for utility model registration] 1. A core mold to which a tube end of a resin pipe is fitted, and a projecting part which is housed in the core mold, projects outward from the core mold when expanded, and has a continuous outer periphery in a circular shape. Sometimes a split mold consisting of a plurality of segments divided so as to be located inward from the outer periphery of the core mold, and the core mold is provided with a resin pipe receiving port forming apparatus provided with an intake hole opening at the split mold portion. , A lubricating oil supply pipe is connected to an intake pipe communicating with the intake hole, and lubricating oil is supplied to an operating portion of the segment through the intake pipe. Mouth forming equipment.