JPH0970646A - Connection structure of sheathed heater in small size shell metallic mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable drastic shortening of working time for a connection and a removal of the connection in a maintenance, etc., of a sheathed heater in a small size shell metallic mold and to obtain the space saving. SOLUTION: A male screw terminal part 2a is provided on the end part of the sheathed heater 2 embedded in the shell metallic mold 1 and a female screw part of an intermediate terminal 4 is formed to the male screw terminal part 2a to fix the sheathed heater 2. A male part 4b is formed at the faced side to the female screw of the intermediate terminal 4 and further, slit 4c is formed to the male part 4b. A female part 5a formed at one side of a cylindrical terminal 5, is fitted to the male part 4b of the intermediate terminal, and a crimp type terminal 6b arranged at both ends of a wire assembly 6 is fixed to the female screw formed at the other side of the cylindrical terminal 5. Then, the wiring connected in such way is fitted or removed between the intermediate terminal 4 and the cylindrical terminal 5. By this constitution, the connection itself of the wire assembly 6 is compactly wired and also, the working times needed to the connection and the removal of connection of sheathed heater are drastically shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire connection structure for a sheathed heater in a small shell mold, and more particularly to the use of a sheathed heater having a male screw terminal portion formed on at least one end thereof. The present invention relates to a great reduction in the wiring work of a buried small shell mold.

[0002]

2. Description of the Related Art Generally, in a shell mold, a sheath heater is used as a mold heating means. In the sheathed heater, a heating element is installed at the center of a cylindrical elongated metal protection tube, and the circumference of the heating element is filled with an insulating material. Further, power terminals are formed at both ends, and male screw terminals are provided at the tips thereof to connect lead wires. for that reason,
The heater itself can be easily attached.

A conventional heater wiring structure using this sheathed heater is as shown in FIGS. 6 and 7. A plurality of sheathed heaters 2 are embedded in the shell mold 1, and male screw terminal portions 2 a of power source terminals arranged at both ends of the sheathed heater 2 are projected outward from the end surface of the mold 1. To be attached to each male screw terminal 2a,
The power supply terminals in the vicinity are connected by the iron plate bar 20, and the iron plate bar 20 is fixed by tightening the nuts 21 from the upper and lower sides of the iron plate bar 20. In this way, all the power supply terminals are connected by the iron plate bar 20 and finally connected to the external power supply.

[0004]

However, in the conventional sheathed heater wire connection structure in the shell mold, many nuts are used to tighten the bar of the iron plate when the sheathed heater is replaced for maintenance of the mold or the like. Therefore, it took a considerable amount of time to remove and install the nut, which deteriorated workability. In addition, when the mold is small, the space for wiring cannot be secured, so the wiring itself must be made compact.

The present invention is to solve the above-mentioned problems, and in a small shell mold of a type using a sheathed heater having a male screw terminal portion formed at least at one end thereof, a connection is attached when the sheathed heater is replaced, It is an object of the present invention to provide a wire connection structure for a sheathed heater that can significantly reduce the work time required for removal and save space.

[0006]

In the sheathed heater wire connection structure according to the present invention, a small shell mold in which a large number of sheathed heaters having male screw terminal portions at least at one end are embedded by projecting the male screw terminal portions. In the wire connection structure of the sheath heater in, a wire assembly having a plurality of lead wires and a connecting member connected to a tip terminal of the lead wire is connected via the male screw terminal portion and an adapter, and the male screw terminal portion and the The adapter is connected with a screw pair,
The connection member and the tip of the adapter are coupled by a snap-fitting pair.

It is preferable that the connecting member is a cylindrical terminal having a female portion formed on one side and a female screw portion formed on the other side.

Further, it is more preferable that the adapter is an intermediate terminal in which a female screw for coupling to the male screw terminal is formed on one side, and a male portion having a slit is formed on the other side, which is fitted to the cylindrical terminal.

[0009]

In the wire connection structure of the sheathed heater in the small shell mold of claim 1, the sheathed heater is embedded in the small shell mold so as to project the male screw terminal portion provided at one end thereof. There is. An adapter is connected to the male screw terminal portion of the sheath heater. Then, the connection member included in the wire assembly is snap-fitted and coupled at the tip of the adapter. Therefore, the wire assembly can be attached to and detached from the sheathed heater with one touch, and the working time can be greatly shortened when performing maintenance on the sheathed heater. Further, since the wire assembly is compactly constructed, space saving can be achieved.

In the connection structure of the sheathed heater in the small shell mold of claim 2, the connecting member is a cylindrical terminal formed in a cylindrical shape, and one of the connecting members is formed with a female screw portion and is formed by a tip terminal of the lead wire and a screw. An electric wire assembly is configured by being coupled. And a female part is formed on the other side,
It is connected to the adapter by a snap-fitting pair. Therefore, the wire assembly can be compactly assembled.

According to another aspect of the present invention, there is provided a sheathed heater wire connection structure for a small shell mold, wherein the adapter is an intermediate terminal connecting the wire assembly and the sheathed heater, and a female screw is formed on one side of the sheathed heater. Is connected to the male screw terminal part and the other part is formed with a slit, and the male part is fitted to the tubular terminal of the electric wire assembly. Therefore, the wire assembly can be attached to and detached from the sheathed heater with one touch. The outer diameter of the intermediate terminal male portion is formed to be the same as or slightly larger than the inner diameter of the female portion of the cylindrical terminal, and since the slit is formed,
When the tubular terminal is fitted, the outer diameter of the male part of the intermediate terminal is slightly reduced and inserted. After being inserted once, the male part of the intermediate terminal pushes outward from the inside of the tubular terminal, so that it is difficult to come off due to friction.

Therefore, the time for connection and disconnection work for maintenance of the sheathed heater can be greatly shortened.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show the state of connection of the sheathed heater in a small shell mold. In this case, the small shell mold has a length and width of about 700 mm × 40.
It means 0 mm.

A plurality of sheathed heaters 2 are embedded in the shell mold 1. The sheathed heater 2 has been conventionally used, and a heating element is arranged in the center of an elongated metal tube.
A power source terminal portion is connected to both ends of the heating element, and a male screw terminal portion 2a is formed at the tip of the power source terminal. One end side of this sheath heater is the power supply side, and the other end side is the neutral point side. Therefore, the side surface of the mold on which the power source side of the sheathed heater is arranged is the power source side 1 of the mold.
a and the neutral point side is called the neutral point side 1b.

A male screw terminal portion 2a of the sheath heater 2 is incorporated through an insulating washer 3 so as to project from the shell mold 1. Reference numeral 4 denotes an intermediate terminal, as shown in FIG. 3, one side of which has a hexagonal outer circumference and an internal thread 4
a is formed. The female screw 4a is screwed onto the male screw terminal portion 2a of the sheath heater 2. This intermediate terminal 4 is used as a male screw terminal portion 2a of the sheath heater.
The sheathed heater 2 is fixed to the mold 1 by tightening it. A male portion 4b is formed on the other side of the intermediate terminal 4, and a slit 4c is formed on the male portion 4b along the axial direction from the end surface.

Reference numeral 5 denotes a cylindrical terminal, the outer periphery of which is formed in a hexagonal shape as shown in FIG.
female part 5a fitted to c is formed, and female screw 5b is formed on the other side.
Are formed. The outer diameter of the male portion 4b of the intermediate terminal is formed to be the same as or slightly larger than the inner diameter of the female portion 5a of the tubular terminal 5. Therefore, when the female portion 5a of the cylindrical terminal is fitted to the male portion 4b of the intermediate terminal 4, the outer diameter of the male portion 4b is slightly reduced by the slit 4c of the male portion 4b and is inserted once it is inserted. Since the male portion 4b of the terminal 4 pushes the female portion 5a of the tubular terminal 5 from the inside toward the outside, the tubular terminal 5 will not come off due to friction unless a new external force is applied.

The electric wire assembly 6 includes a heat resistant lead wire 6a, crimp terminals 6b fixed to both ends of the heat resistant lead wire 6a, and the cylindrical terminal 5 described above. The crimp terminal 6b is formed in a round shape, and a central portion thereof is formed with a hole into which a machine screw having a cross hole is loosely fitted. Then, the crimp terminal 6b is tightened and fixed to the female screw portion 5b of the tubular terminal 5 by means of a small screw having a cross hole through the washer. At this time, since the wire assembly 6 is continuously wired, the crimp terminal 6b is different from the crimp terminal 6b of another heat-resistant lead wire.
At the same time, it is fixed to the tubular terminal 5.

On the power source side of the mold 1, the mold 1
The electric wire assembly 6 that is continuously connected from the sheathed heater 2 embedded in is divided into three groups. Then, the external three-phase power supplies R, S, and T are wired to any one of the groups of the three electric wire assemblies 6.

On the neutral point side 1b of the die 1,
The wire assembly 6 connected from all the sheath heaters is continuously wired.

The above-described wire connection structure is performed on one shell mold on all four surfaces of both upper and lower mold halves.

A procedure for carrying out maintenance of, for example, a sheath heater for the die connected as described above will be described as follows.

First, the upper mold (or lower mold) of a mold requiring maintenance is placed on a dedicated carriage. Subsequently, the connected tubular terminal 5 is pulled and removed from the intermediate terminal 4. This is performed for all of the power source side 1a and the neutral point side 1b of the mold 1. At this time, the wire assembly 6 which is continuously wired and integrated with the tubular terminal 5 can be temporarily placed in an appropriate place.

Next, the hexagonal outer circumferences of all the intermediate terminals 4 are loosened by a tool such as a spanner, and the intermediate terminals 4 are removed from the sheath heater 2. The sheath heater 2 becomes free. 2 can be removed from the mold 1. Here, the maintenance of the sheath heater 2 is performed.

The sheathed heater 2 that has been maintained or a new sheathed heater 2 is then inserted into the mold 1. The power source side 1a of the sheathed heater 2 inserted in the mold 1,
After inserting the insulating washer 3 into the male screw terminal portion 2a protruding on both sides of the neutral point side 1b, tighten the intermediate terminal 4,
Fix the sheath heater. Then, finally, the tubular terminal 5 of the wire assembly 6 temporarily placed in another place is attached to the intermediate terminal 4 connected to the male screw terminal portion 2a of the sheath heater 2 with one touch. Then, the lower die (or upper die) or another die is replaced, and the same work is performed.

As described above, the connection work or the connection removal work in the maintenance of the sheath heater can be significantly shortened as compared with the conventional one. Further, since the wire connection itself of the wire assembly can be compactly assembled, it is very advantageous for a small mold that does not take up space.
Therefore, a safety cover can be attached to the connection surface of the mold.

In the present embodiment, the intermediate terminal as an adapter and the cylindrical terminal are snap-fitted to each other by coupling, and a slit is formed in the male portion of the intermediate terminal to form a male portion of the intermediate terminal in the tubular terminal. Although the female part to be fitted to is formed, it may of course be reversed. Further, the slit may be formed in a cross shape, or a plurality of slits may be formed. Further, the snap-fitting pair coupling means is not limited to this embodiment as long as it is a well-known means other than the slit.

[Brief description of drawings]

FIG. 1 is a diagram showing a sheath heater connection state of an embodiment according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a partial sectional view of an intermediate terminal.

FIG. 4 is a partial sectional view of a cylindrical terminal.

FIG. 5 is a diagram showing a part of an electric wire assembly.

FIG. 6 is a perspective view showing a sheath heater connection state in a conventional example.

FIG. 7 is a detailed view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Shell mold 2 ... Sheath heater 2a ... Male screw terminal part 4 ... Intermediate terminal (adapter) 4a ... Female screw part 4b ... Male part 4c ... Slit 5 ... Cylindrical terminal (connecting member) 5a ... Female part 5b ... Female screw 6 ... Wire assembly 6a ... Heat resistant lead wire 6b ... Crimp terminal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Sadamoto Sadamoto 1 Toyota-cho, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. (72) Inventor Kiyoji Omori 1-cho, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. ( 72) Inventor Masao Ishii, 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Corporation (72) Inventor, Koji Kaneda, 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Corporation (72) Inventor, Tsujihiko Yasuda, Aichi 107 Takanedai, Midori-ku, Nagoya-shi, Nagoya (72) Inventor Akiyoshi Hanno 230 Okita-machi, Nakamura-ku, Nagoya, Aichi Chubu Sukegawa Kogyo Co., Ltd. (72) Inventor Tamuro Ito Okita-machi, Nakamura-ku, Nagoya 230 Chubu Sukegawa Kogyo Co., Ltd.

Claims (3)

[Claims] 1. A wire connection structure of a sheathed heater in a small shell mold in which a plurality of sheathed heaters having male screw terminal portions at least at one end are embedded by projecting the male screw terminal portions. An electric wire assembly having a connecting member connected to a tip terminal of a lead wire is connected to the male screw terminal portion via an adapter, the male screw terminal portion and the adapter are coupled by a screw pair, and the connecting member and the adapter are connected. A wire connection structure for a sheathed heater in a small shell mold, characterized in that the tip is connected by a snap fitting pair. 2. The connection of a sheath heater in a small shell mold according to claim 1, wherein the connecting member is a cylindrical terminal having a female portion formed on one side and a female screw portion formed on the other side. Construction. 3. The adapter is an intermediate terminal in which one side is formed with a female screw to be coupled to the male screw terminal, and the other side is fitted into the cylindrical terminal, and a male portion having a slit is formed. The wire connection structure of the sheathed heater in the small shell mold according to claim 1 or 2.