JPH03102191A - Door device for vacuum heat treating furnace - Google Patents

Abstract

PURPOSE:To reduce an installation space and to facilitate check and maintenance by moving a door body by rotating a hanging member attached at one end to the body by a rotary driver, operating a protective cover as its counterweight, and sealing with a sealing ring the peripheral wall of an opening. CONSTITUTION:Drivers are operated to rotate a lever 15 for pressing a door body 13 to a sealing ring 7 of the peripheral wall of a conveying opening 6, at a predetermined angle to be opened. Then a motor with a reduction gear brake is operated to rotate a rotary drive shaft 8 to raise the body 13, and to simultaneously lower a protective cover 14. When the cover 14 is moved to a position opposed to the ring 7, the motor is stopped. The cover 14 is pressed to the ring 7 by the rotation of the lever 15 by the drivers. Influence of radiation heat when a material 4 to be treated is passed through the opening 6 is effectively prevented by the cover 14. The cover 14 is also operated as a counterweight of the body 13. As a result, the load of the motor can be reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a door device used to independently and hermetically close each chamber such as a heating chamber and a cooling chamber of a vacuum heat treatment furnace. .

[Prior Art] Conventionally, as a door device for a vacuum heat treatment furnace,
As shown in the figure, a heating chamber C surrounded by a heat shield B made of a heat insulating material is provided in a metal furnace chamber A, and a processed material D is stored in this heating chamber C and subjected to heat treatment. . Furnace room A
The partition wall E, which makes the inside airtight, is provided with an opening F through which the processed material D is carried in and carried out. Further, G is a door body, and this door body G is provided with a rubber seal ring H on the inside thereof, and is airtightly sealed against the partition wall E. Also, the door body G
A shutter I is rotatably attached to the lower end of the shutter.

A lifting cylinder J is provided above the front surface of the opening F, and a lifting platform L is attached to the tip of the cylinder rod K of this lifting cylinder J, and the door body G is connected to this lifting platform L via a link M. The lifting cylinder J
The actuator is moved up and down between a position where the opening F is closed, which is shown by a solid line in the drawing, and a retracted position which is shown by a phantom line in the drawing.

The shutter I provided at the lower end of the door body G covers the lower part of the seal ring H inside the door body G when the door body G is raised and lowered by the operation of the lifting cylinder J. This serves to prevent the heat from being burned out by the radiant heat from the heating chamber C.

[Problems to be Solved by the Invention] However, in the conventionally known device configured to open and close a door using a lifting cylinder as described above, the lifting cylinder extends along the plane of the opening. Therefore, if the lifting cylinder is installed vertically with respect to the opening, the installation will be large in the height direction, and if the lifting cylinder is installed horizontally with respect to the opening, the installation will be large in the horizontal direction. Space is required.

In addition, a seal ring is provided inside the door body to maintain airtightness when the door is closed, so if the seal ring has reached its end of life or is burnt out, it is necessary to take the door body out of the furnace room. Maintenance work is troublesome.

Further, the reciprocating sliding of the cylinder rod of the lifting cylinder increases the chances of dust being drawn in, and the vacuum sealing of the shaft seal of the lifting cylinder is likely to become impossible.

Furthermore, the known devices as described above have a large number of structural parts, are complex in construction, and are expensive.

The problem to be solved by the present invention is to eliminate the problems of such conventionally known devices. Therefore, the present invention provides a rotary drive mechanism for operating the door body instead of a lifting cylinder mechanism. The purpose of the present invention is to provide a door device for a vacuum heat treatment furnace that can reduce installation space, is easy to maintain and inspect, and has a simple structure.

[Means for Solving the Problems] In order to achieve the above object, a door device for a vacuum heat treatment furnace according to the present invention provides a door device for a vacuum heat treatment furnace that prevents workpieces from being carried into a heating chamber of a vacuum heat treatment furnace;
A seal ring is attached to the peripheral wall of the carrying-out opening, a rotary drive body is provided above the opening for carrying in and carrying out the processed material, and the rotating driving body has both ends covering the opening for carrying in and carrying out the processed material. A hanging member is attached to which a door body and a protective cover are respectively attached, and the door body and the protective cover are moved up and down relative to each other via the hanging member by driving the rotary drive body, In addition, when the opening for carrying in and carrying out the processed material is closed, the door main body and the protective covering are used to close the opening for carrying in and carrying out the processed material, and when the opening for carrying in and carrying out the processed material is opened, the protective covering is used to open the opening for carrying in and carrying out the processed material. It is characterized by providing means for pressing against the seal ring on the peripheral wall.

[Function] In the vacuum heat treatment furnace door device according to the present invention constructed in this manner, the door body is moved by rotating the hanging member to which the door body is attached at one end by the rotary drive body. In this case, a protective covering mounted on the other end of the suspension member acts as a counterweight. Further, since the protective cover is raised and lowered simultaneously with the raising and lowering of the door body, openings for loading and unloading objects can be opened and closed quickly and smoothly.

At the same time as the opening for loading and unloading the workpiece is opened, the peripheral wall of the opening is covered with a protective cover, thereby protecting the seal ring on the peripheral wall from radiant heat from the processing chamber.

Furthermore, since the seal ring is provided on the peripheral wall of the opening for carrying in and carrying out the processed material, its maintenance can be easily performed.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2 of the accompanying drawings.

FIG. 1 and FIG. 2 show an embodiment of the present invention. In these drawings, 1 is a metal furnace chamber, and a heat shield 2 made of a heat insulating material is disposed inside the furnace chamber 1. A heating chamber 3 is defined. The object to be treated 4 is heat-treated within the heating chamber 3 . Reference numeral 5 denotes a partition wall that makes the inside of the furnace chamber 1 airtight, and this partition wall 5 is provided with an opening 6 for carrying in and out the processed material 4 . A seal ring 7 is attached to the outer surface of the peripheral wall 5a of the loading/unloading opening 6.

A rotary drive shaft 8 is provided above the loading and unloading opening 6 parallel to and horizontally to the surface of the loading and unloading opening 6, and the rotary driving shaft 8 is equipped with a chain wheel 9. One end protrudes to the outside through the furnace wall of the furnace chamber 1, and is connected to an electric motor 11 with a speed reducer and brake attached to a mounting flange lO provided on the furnace wall.

A chain l2 serving as a hanging member is attached to a chain wheel 9 on the rotation drive shaft 8.
is hung, and at one end of the chain l2 there is a door body l3 that covers the loading and unloading opening 6, and at the other end of the chain 12 there is a protective cover l3.
4 are installed respectively. As shown in the left half of FIG. 2, the protective cover l4 has a central opening 14a through which the material to be processed 4 passes, and a seal ring 7 on the peripheral wall 5a of the loading/unloading opening 6.
It covers the entire circumference of the seal ring 7 to prevent the seal ring 7 from being burnt out due to radiant heat when the processed material 4 passes through the loading/unloading opening 6.

Further, as shown in FIG. 2, on both sides of the loading/unloading opening 6, there are levers l5 for pressing the door main body l3 and the protective cover 14 against the seal ring 7 of the peripheral wall 5a of the loading/unloading opening 6.
are provided, and these levers l5 are each connected to a drive device 1B provided outside the furnace chamber 1.

The operation of the illustrated apparatus configured in this way will be explained.

First, when taking out the processed material 4 heat-treated in the heating chamber 3 from the heating chamber 3, that is, the opening 6 for carrying in and carrying out the heating chamber 3
When opening the door, each drive device l6 is operated to carry in the door body l3, and the seal ring 7 of the peripheral wall 5a of the carrying-out opening 6 is opened.
The lever l5 that is being pressed against the lever is rotated by a certain angle to release it. Thereafter, the electric motor 1l with a reducer brake is activated to rotate the rotary drive shaft 8, and as shown in the right half of FIG. When l4 descends to a position facing the seal ring 7 of the peripheral wall 5a of the loading/unloading opening 6,
The electric motor 11 with a reduction gear brake is stopped by a signal from a position sensor (not shown). The protective cover 14 is pressed against the seal ring 7 of the peripheral wall 5a of the loading/unloading opening 6 by rotation of the lever 15 by each drive device l6. In this way, the processed material 4 is taken out from the heating chamber 3 through the loading/unloading opening 6. The protective cover 14 can effectively prevent the influence of radiant heat when the processed material 4 passes through the loading/unloading opening 6 of the heating chamber 3 . In addition, the protective cover l4 is the door body 1
Acts as a counterweight for 3, and as a result the electric motor l
The load on 1 can be reduced.

On the other hand, when closing the loading/unloading opening 6 with the door body l3, the lever 15 pressing the protective cover l4 against the seal ring 7 of the peripheral wall 5a of the loading/unloading opening 6 is released. , the rotary drive shaft 8 is rotated in the opposite direction by the electric motor 11 with a reducer brake, and as shown in the left half of FIG. When the door body 13 is lowered to a predetermined position relative to the loading/unloading opening 6, the electric motor 11 with a reducer brake is stopped by a signal from a position sensor (not shown), and the door body 13 is rotated by the lever l5 by each drive device l6. The loading/unloading opening 6 is pressed against the seal ring 7 of the peripheral wall 5a of the opening 6 for sealing.

By the way, in the illustrated embodiment, the door body ■3 and the protective cover l
4 is lifted and lowered by a chain wheel 9 and a chain 12 on a rotary drive shaft 8, but instead of the chain wheel 9 and chain 12, other suitable lifting means such as a winding can be used as a rotary drive body and a hanging member. Driving shaft 8 that rotates the drum and wire rope
It may also be possible to attach it to the

[Effects of the Invention] As explained above, according to the present invention, the door body is configured to be raised and lowered by rotational movement by an electric motor, so the height of the lifting mechanism is lower than that of a conventional cylinder-type lifting mechanism. In addition to being able to significantly reduce the installation space in both directions, a rotating shaft seal can be used instead of a sliding shaft seal, and the vacuum seal of the furnace can be maintained reliably and easily.

Further, since a seal ring for keeping the heating chamber airtight is provided on the loading/unloading opening side, maintenance work such as seal ring replacement and cleaning becomes simple and easy.

Furthermore, the protective cover is operated in conjunction with the lifting and lowering of the door body, and when the loading/unloading opening is opened, the seal ring is protected all around, thereby reliably preventing it from being burnt out.

Furthermore, according to the present invention, the number of structural parts of the device can be reduced, and the structure can be simplified.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view showing one embodiment of the present invention, and Fig. 2 is a schematic diagram of the device shown in Fig. 1 seen from the front. Electric motor with machine brake 12: Chain 13: Door body 14: Protective cover 15: Lever 16: Drive device Furnace chamber heat shield body Heating chamber Partition wall of processed material Peripheral wall Opening seal ring for carrying in and out Fig. 1 Fig. 2

Claims (1)

[Claims] A seal ring is attached to the peripheral wall of the opening for loading and unloading the workpiece in the heating chamber of the vacuum heat treatment furnace, and a rotary drive body is provided above the opening for loading and unloading the workpiece. Attach a hanging member to which a door body and a protective covering are respectively attached to cover the openings for carrying in and carrying out the processed material,
The door main body and the protective cover are configured to be moved up and down relative to each other via the hanging member by the drive of the rotary drive body, and the door main body and the protective cover are connected to the opening for carrying in and out the processed material. The apparatus is characterized in that means is provided for pressing the door body when the opening is closed and the protective cover against a seal ring on the peripheral wall of the opening for carrying in and carrying out the processing object when the opening for carrying in and carrying out the processing object is opened. Door device for vacuum heat treatment furnace.