JPH08257724A - Lower door mechanism of ingot heating device - Google Patents

Abstract

(57) [Summary] [Purpose] The structure of the single-sided door is reviewed to improve the sealing performance of the heating chamber, while saving space when opening and closing, and reducing wear and scoring damage. A lower door 51 for sealing the lower opening 14 of the heating chamber 12 has one end supported by a rotary shaft 52, and a rotary actuator 56 provided on the rotary shaft 52 serves to
The open / close position can be rotated over 0 degree, and the ingot W is transferred downward while being guided by the lower door 51. Further, when the lower door 51 is closed, the door lock member bar 70
Is pushed upwards by.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a lower door mechanism of an ingot heating device.

[0002]

2. Description of the Related Art An ingot heating device for forming a metal molded body is required to have a sealing property for maintaining a vacuum or an atmosphere in a heating chamber, and a heat resistance between the heating chamber and a lower greenhouse. In order to achieve this requirement, there is a technique in which openable and closable doors (referred to as upper door and lower door) are provided above and below the heating chamber, respectively, and a sealing structure is provided between the chambers.
No. 626 is known.

[0003]

However, since the upper door and the lower door of the ingot heating device disclosed in Japanese Patent Laid-Open No. 5-285626 are slide type, it is difficult to maintain the hermeticity due to the structure. Also, even if the heat resistance requirements are met, a large space is required when opening the door, and the lower door in particular slides with the ingot placed on the top surface, so the lower door is worn and shaving when opening and closing due to the sticky ingot. There was damage.

The present invention has been made to solve the above problems, and its purpose is to improve the sealing property of a heating chamber, and at the same time to achieve space saving at the time of opening and closing, resulting from an ingot sticking to the lower door. This is to reduce the wear and galling damage that occur.

[0005]

In order to solve the above problems, the present invention has a rotating shaft at the bottom of a heating chamber for heating an ingot in a semi-molten state under an inert gas atmosphere or in a vacuum. A single-opening door that opens and closes around the rotation axis is provided, and the rotary door also serves as a guide member that guides the ingot downward when the single-opening door is opened.

A door lock member is provided to prevent downward movement of the one-sided door when the door is closed.

[0007]

[Function] The single-opening door opens and closes around the rotary shaft as the center of rotation, adheres to the lower part of the heating chamber when closed to securely seal the heating chamber, and smoothly opens the ingot transferred downward by the single-opening door when opening. invite.

When closed, the door lock member presses the lower door from below to enhance the sealing property of the heating chamber.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a cross-sectional view of a main part of an injection molding apparatus to which the lower door mechanism of the ingot heating device according to the present invention is applied.

The injection molding apparatus 1 comprises an injection machine 3 having a screw 2 built therein and a material supply chamber 10 for supplying a raw material to the injection machine 3. The material supply chamber 10 introduces an ingot from top to bottom. It comprises a chamber 11 (see FIG. 2), a heating chamber 12, a greenhouse 13, and a crushed material accumulating chamber 15 equipped with a crushing cutter 21.

The crushing cutter 21 is a tip member of the crushing means 20, and includes a drive shaft 22, a free shaft 23, and a biaxial gear case 2.
4. The motor 26 is connected via the speed reducer 25.
The two-shaft gear case 24 is an output distributor having one input shaft and two output shafts, and one motor 26 is used for two crushing cutters 2.
1, 21 are rotated in opposite directions.

The greenhouse 13 is surrounded by a heater 31 and a heat insulating material cylinder 32, has a height enough to accommodate one ingot, and has a vacuum / gas pipe 33 connected to the upper part thereof. The vacuum / gas pipe 33 is evacuated or supplied with an inert gas by switching.

The crushed material accumulating chamber 15 has a certain height and has a high level sensor 35 and a low level sensor 36 which are separated in the height direction. Reference numeral 37 in the drawing denotes a thermometer for measuring the temperature distribution in the axial direction of the injector 3.

FIG. 2 is a sectional view taken along the line AA of FIG. The heating chamber 12 is a vacuum heating container including a cylindrical ceramic holder 41, an induction heating coil 42, a magnetic shield material 43, and an outer cylinder 44, and a shutter (referred to as an upper door) 45 at the upper portion, the inner portion, and the lower portion, respectively. A lower door mechanism 50 including a lower door (single-opening door) rotatably supported by the ingot stopper 46 and the rotating shaft 52 is provided. Ingot W
Is held in the holder 41 during heating and monitored by the radiation thermometer 48.

The lower door mechanism 50 according to the present invention will be described below. FIG. 3 is an enlarged cross-sectional view of the lower part of the heating chamber. A lower door 51 for closing the opening 14 is arranged in the lower opening 14 of the heating chamber 12, and one end of the lower door 51 is a rotating shaft 52.
And is rotatable about the rotating shaft 52 from the position indicated by the solid line to the position indicated by the chain double-dashed line by 90 degrees.

The lower door 51 has an inclined surface 51b formed on the other end of the one surface 51a. When the lower door 51 is opened 90 degrees, the inclined surface 51b is connected to the greenhouse 13 and the inclined surface 16a of the connecting portion 16 is connected. The lower door 51 so as to be parallel to the axis L1 passing through the center of the heating chamber 12, and to guide the downward transfer of the ingot W (see FIG. 2) when the lower door 51 is opened. . That is, the lower door 51 is used as a guide member for the ingot W. The lower opening 1
A heat-resistant alloy sealing member 17 is provided on the contact surface of the periphery 4 of the peripheral portion 14a with the lower door 51 to hermetically seal the heating chamber 12.

Further, on the rotary shaft 52, there is provided a presser 53 whose one end is supported and which has a substantially L-shaped cross section. The presser 53 has a right angle portion oblique to the axis L1 passing through the center of the heating chamber 12. Intersecting inclined surfaces 54 are formed. The other end of the retainer 53 is in contact with the one surface 51a of the lower door 51 on the axis L1.

Further, the rotary shaft 52 is supported by a shaft hole 55 having a long hole in cross section, and in the closed position of the lower door 51, the rotary shaft 52 (lower door 51) is moved up and down by an amount larger than the shaft diameter. It can be moved in any direction. With this configuration,
When the lower door 51 is closed, partial contact between the lower door 51 and the seal member 17 is prevented.

Further, on the axis L2 extending in the direction perpendicular to the axis L1 passing through the center of the heating chamber 12, when the lower door 51 is closed, the lower door 51 is in contact with the inclined surface 54 so that the lower door 51 is closely attached to the opening 14. A door lock bar 70 having a wedge-shaped reciprocating rod 71 that presses against is provided, and these are housed in a main body 72. Here, 73 is a lock bar detent for preventing the swinging of the door lock bar 70, and 74 is a seal member, and heat generated by sliding friction of the door lock bar 70 is released by a cooling means (not shown). ing. Incidentally, 75 is a piston rod, and 76 is a cylinder mast.

FIG. 4 is an end view taken along the line BB of FIG. 3, with a part broken away. A rotary actuator 56 including a motor for rotating the rotary shaft 52 is provided at one end of the rotary shaft 52. This rotating shaft 5
A presser 53 is attached to the center of the shaft 2 in the axial direction, and the presser 53 can be rotated in conjunction with the rotary shaft 52 via a sunken key 57 or the like.

Further, coaxially with the rotary shaft 52, a pair of door guides 58, 59 having a shaft hole slightly larger than the rotary shaft 52 and sandwiching the pressing member 53 are provided so that the lower door 51 can move freely. I am able to do it.

The leg portion 58 of the pair of guides 58, 59
Rotation interlocking pins 60 are provided on the a and 59a to connect them, and when the lower door 51 is closed, the presser 53 is held by the door lock bar 7.
By pressing with 0, the rotation interlocking pin 60 can be pressed toward the lower door 51 and can be brought into close contact with the periphery 14 a of the opening 14.

The opening / closing operation of the lower door mechanism described above will be described. FIG. 5 is a diagram for explaining the closing operation of the lower door, and the lower door 51
The rotary actuator 56 (see FIG. 4) is driven from the opened state (see FIG. 5A) in which the lower door 51 is opened to bring the lower door 51 into contact with the periphery 14a of the opening 14 (see FIG. 5B).

After that, the door lock bar 70 is driven to extend the reciprocating rod 71 and hold it by the wedge-shaped portion 53.
The inclined surface 54 of is pushed. Due to this pressing, the rotary shaft 52 moves upward along the shaft hole 55, and the lower door 51 comes into close contact with the periphery 14a of the opening 14 without a single contact. That is,
The heating chamber 12 can obtain excellent sealing performance by the lower door 51.

FIG. 6 is a view for explaining the opening operation of the lower door,
From the closed state in which the lower door 51 is pushed by the door lock bar 70 and is closed (FIG. 6A), the door lock bar 70 is contracted,
The rotary actuator 56 is driven in the direction opposite to the closing direction to open the lower door 51 (see FIG. 6B) to start the downward transfer of the ingot W from the heating chamber 12.

At this time, the rotary actuator 56 is driven while performing the brake servo to prevent a sudden downward movement of the lower door 51. Therefore, as shown in the figure, the ingot W is transferred downward along the other surface 51c of the lower door 51, and the ingot W does not suddenly drop downward. 13 (see FIG. 2) and the like will not be damaged.

The lower door 51 is then rotated about the rotary shaft 52 until it comes into contact with the inclined surface 16a of the connecting portion 16 (see FIG. 6C), and the ingot W is guided downward by the lower door 51. Be transferred to. That is, the ingot W is smoothly transferred using the lower door 51 as a guide member.

[0028]

Since the present invention has the above-mentioned structure, it has the following effects. According to a first aspect of the present invention, a single-opening door that has a rotating shaft and opens and closes around the rotating shaft is provided in a lower portion of a heating chamber that heats the ingot in a semi-molten state in an inert gas atmosphere or in a vacuum. Since the rotating door is also used as the guide member for guiding the ingot downward when the opening door is opened, not only excellent sealing performance can be obtained, but also the ingot can be smoothly transferred. Further, as compared with the slide type opening / closing door, the seal surface around the opening is less likely to be scratched or damaged due to foreign matter and the space is compact.

According to a second aspect of the present invention, since the door lock member that suppresses the downward movement of the one-sided door when closed is provided, the door can be reliably pressed from below by the door lock member when closed, and the sealing property of the heating chamber is further improved. Let

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part of an injection molding device to which a lower door mechanism of an ingot heating device according to the present invention is applied.

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

FIG. 3 is an enlarged sectional view of the lower part of the heating chamber.

4 is an end view taken along the line BB of FIG.

FIG. 5 is a diagram illustrating a closing operation of a lower door.

FIG. 6 is a diagram illustrating an opening operation of a lower door.

[Explanation of symbols]

1 ... Injection molding apparatus, 12 ... Heating chamber, 37 ... Thermometer, 41
... Ceramic holder, 42 ... Induction heating coil, 43 ... Magnetic shield material, 44 ... Outer cylinder, 45 ... Upper door (single-sided door),
46 ... Ingot stopper, 48 ... Radiation thermometer, 50 ...
Lower door mechanism, 51 ... Lower door (single-sided door), 52 ... Rotating shaft, 5
3 ... Presser, 54 ... Inclined surface, 55 ... Shaft hole, 56 ... Rotary actuator, 58, 59 ... Door guide, 60 ...
Rotation interlocking pin, 70 ... Door lock bar, 71 ... Reciprocating rod.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Atsushi Suzuki 1-10-1 Shin-Sayama, Sayama-shi, Saitama Prefecture Honda Engineering Co., Ltd. (72) Hiroshi Mizutani 1-10-1 Shin-sayama, Sayama-shi, Saitama Prefecture Within Da Engineering Co., Ltd.

Claims (2)

[Claims] 1. A single-opening door having a rotary shaft for opening and closing around the rotary shaft is provided in a lower portion of a heating chamber for heating an ingot in a semi-molten state in an inert gas atmosphere or in a vacuum. A lower door mechanism for an ingot heating device, wherein the lower door mechanism is also used as a guide member for guiding the ingot downward when the opening door is opened. 2. The lower door mechanism of the ingot heating device according to claim 1, further comprising a door lock member that suppresses downward movement of the one-sided door when closed.