JP2565319Y2 - Connection device for resin mandrel - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting device for a resin mandrel, and more particularly to a connecting device for a resin mandrel capable of accurately joining terminal connecting portions of the resin mandrel.

[0002]

2. Description of the Related Art In general, when manufacturing a long hose, a resin mandrel made of nylon or the like is used. However, since this resin mandrel is used after being cut according to the length of the hose, a resin mandrel is used. When a mandrel is reused, it is necessary to join resin mandrels.

Conventionally, as an apparatus for connecting a resin mandrel as described above, a cutting end face of a resin mandrel is brought into contact with both sides of a hot plate heated to such an extent that the resin is melted, and then heated and melted for a predetermined time. Remove the hot plate. After that, the end faces of the melted resin mandrel are abutted against each other, pressure-bonded, and cooled and solidified for connection.

[0004]

[Problems to be Solved by the Invention] However, in the case of the method of connecting the resin mandrel as described above, the connection of the bent state due to the bending habit of the resin mandrel and the step of the connecting portion due to the difference in the outer diameter cannot be avoided. Since there is a large flow of the resin at the connection welded portion, a so-called finishing operation is required, in which the flow portion is cut off with a knife or the like after connection, and there has been a problem that workability and productivity are extremely poor.

The present invention has been devised in view of such a conventional problem, and can always be connected linearly and accurately with no step at the joint of the resin mandrels. It is an object of the present invention to provide a resin mandrel connection device capable of significantly reducing workability such as shaving a flow portion with a scalpel or the like because of less occurrence of resin flow, and capable of significantly improving workability and productivity. It is.

[0006]

In order to achieve the above object, the present invention provides a heating and melting means for a connecting portion of a resin mandrel, a split mold for covering the outer peripheral surface of a terminal connecting portion of the resin mandrel, and a split mold for covering the outer peripheral surface of a connecting portion of the resin mandrel. The gist of the present invention comprises a mold frame which is detachably held and which can be opened and closed and provided with a mold heating means.

[0007]

The present invention is constructed as described above, and in a state where the connection end faces of the resin mandrel are abutted, the outer peripheral surface thereof is covered with a split mold, and the connection end faces of the resin mandrel are abutted in a state of being melted by heating and melting means. By pressing and crimping and cooling and solidifying in the split mold in the crimped state, the joint of the resin mandrel is always linear,
In addition, since the flow of the resin is small, the finishing operation of shaving the flow portion with a knife or the like can be omitted.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front view of a resin mandrel connecting device embodying the present invention.
Shows a split resin mandrel used in the manufacture of hoses made of nylon, 11 nylon, etc.
a and 2b are terminal connecting portions 3 of the resin mandrels 1a and 1b.
5A and 5B show a horizontally movable V-block-shaped slide table that supports the vicinity of the slide tables 2a and 3b.
In response to the above, clamp cylinders 5a and 5b having clamp members 4a and 4b provided with V-shaped clamp grooves (not shown) are vertically arranged, and these are clamp means 6a for the resin mandrels 1a and 1b. , 6b.

Between the clamping means 6a and 6b, there is provided a heating and melting means 7 which abuts the terminal connecting portions 3a and 3b of the resin mandrels 1a and 1b and connects them linearly in a molten state. As shown in FIG. 2, a split mold 8a, 8b for covering the outer peripheral surface of the terminal connection portion of the resin mandrel 1a, 1b, the split molds 8a, 8b are detachably held, and the mold 8a , 8b comprising openable and closable mold frames 11a and 11b each provided with a heating means 9 and a cooling means 10, and 12 denotes an opening and closing cylinder.

As the heating means 9 embedded in the mold frames 11a and 11b, a cartridge heater for heating the split molds 8a and 8b to about 300 ° C. is used.
The cooling means 10 includes a cold water pipe 10a through which cooling water and the like flow. This cooling means 10 is for forcibly cooling after the terminal connection portions of the resin mandrels 1a and 1b are abutted and connected linearly in a molten state. The split molds 8a and 8b can be exchanged according to the outer diameter of the resin mandrel 1a and 1b.
In a state where the connection end surfaces of a and 1b are abutted with each other, they have a width enough to cover the outer peripheral surface.

Next, a method of connecting the terminals of the resin mandrels 1a and 1b will be described. First, the split molds 8a, 8b corresponding to the outer diameters of the resin mandrels 1a, 1b are set on the mold frames 11a, 11b of the heating and melting means 7 in an open state, and then the cut resin mandrels 1a, 1b are cut. The terminal connecting portion is connected to the slide tables 2a, 2b of the clamping means 6a, 6b and the clamping cylinders 5a, 5b arranged on both sides of the heating and melting means 7.
Is clamped and fixed by the clamp members 4a and 4b attached to the. At this time, the resin mandrels 1a and 1b are arranged so that the terminal connection surfaces thereof come into contact with each other.

In this state, the split molds 8a, 8a,
8b is set via the opening / closing cylinder 12 to close the mold frames 11a, 11b, and the resin mandrel 1a,
The outer peripheral surfaces of the terminal connection portions 3a and 3b of 1b are covered so as to sandwich the terminal connection portions 1b, and the terminal connection portions 3a and 3b are heated for a predetermined time by the heating means 9 embedded in the mold frames 11a and 11b. The heating time needs to be set according to the type of the resin of the mandrel, but is generally 15 seconds to 60 seconds for a thermoplastic resin.

After the elapse of the set time, the heating by the heating means 9 is stopped, and at the same time, the right and left slide tables 2a, 2b of the clamping means 6a, 6b are moved to the heating means 9 side to remove the molten resin mandrels 1a, 1b. Press the ends against each other and pressurize. The cooling is performed by the cooling means 10 incorporated in the mold frames 11a and 11b under this pressurization, but it is also possible to force the cooling by flowing cold water through the cold water pipe 10a as required.

After the cooling of the terminal connecting portions of the resin mandrels 1a and 1b is completed, the split mold 8
mold frames 11a and 11b on which a and 8b are set
Is released, the clamps 6a, 6b are also released, and the connected resin mandrels 1a, 1b are taken out to complete the operation. Thus, the resin mandrel 1a,
In a state where the connection end surfaces of the resin mandrels 1a and 1b are welded by the heating and melting means 7, the connection end surfaces of the resin mandrels 1a and 1b are butt-bonded with each other, and the crimping is performed. Mold 8a,
8b, the resin mandrel 1 is cooled and solidified.
Since the seam between a and 1b is always linear and the flow of the resin is small, the finishing work such as shaving the flow portion with a knife or the like can be omitted.

[0015]

According to the present invention, as described above, the heating and melting means includes a split mold for covering the outer peripheral surface of the terminal connection portion of the resin mandrel, the split molds are detachably held, and the mold heating means is provided. Because it is configured with a mold frame that can be opened and closed, there is no step at the joint of the resin mandrel, it can always be connected linearly and accurately, and there is little occurrence of resin flow in the connection welded part, Finishing work such as shaving the flow portion with a scalpel or the like can be omitted, and there is an effect that workability and productivity can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a front view of a resin mandrel connection device embodying the present invention.

FIG. 2 is an enlarged sectional view taken along the line AA of FIG.

[Explanation of symbols]

1a, 1b Resin mandrel 2a, 2b Slide table 3a, 3b Terminal connection part 4a, 4b Clamp member 5a, 5b Clamp cylinder 6a, 6b Clamp means 7 Heating and melting means 8a, 8b Split mold 9 Heating means 10 Cooling means 11a, 11b Mold flame

Claims (2)

(57) [Scope of request for utility model registration] 1. A terminal portion of a resin mandrel is clamped by clamping means movable in a horizontal direction, and the terminal portion of the resin mandrel is connected by butt in a state of being melted by heating and melting means. In the resin mandrel connection device, the heating and melting means is a split mold that covers the outer peripheral surface of the terminal connection portion of the resin mandrel, and the split molds are detachably held, and can be opened and closed with mold heating means. A connection device for a resin mandrel characterized by comprising a simple mold frame. 2. The resin mandrel connection device according to claim 1, wherein a heating means for heating the entire mold and a cooling means are provided inside the mold frame.