JPS60194015A - Door device for vacuum heat treating furnace - Google Patents

Abstract

PURPOSE:To maintain the life of a seal ring for a long period by providing a door device which moves the seal ring provided on the door body side to the position to make the ring free from radiation heat and obviates slip of the seal ring when the door is held open. CONSTITUTION:When an open/shut shaft 20 is rotated counterclockwise, a connecting shaft 23 is moved by turning of an open/shut arm 22 so as to draw an arc, thereby moving a door body 8 and a shielding door 10 so as to detach respectively from a partition wall 5 and a heating chamber 3. An oscillating rail 26 is oscillated counterclockwise via a guide roller 25 by the moving door body 8. When the roller 25 arrives at the curved part of a guide groove 27, the door body 8 rotates clockwise. The movement of the body 8 (seal ring 32) until said body detaches from the wall 5 is thus made into parallel movement, by which the slip between the ring 32 and the wall 5 is eliminated. The shaft 32 detaches further from the aperture and the rail 26 inverts to a clockwise direction on descending of the roller 25 and arriving at the horizontal part of the groove 27 so that the door body 8 surface attached with the seal ring is thoroughly directed downward.

Description

[Detailed description of the invention] [Industrial application field] The present invention applies to a door device for a vacuum heat treatment furnace.

[Prior Art] In a vacuum heat treatment furnace used for heat treating metals, etc., a rubber seal is provided between the door and the furnace body to ensure a vacuum inside the furnace. This seal is easily damaged by radiant heat from the processed material when the door is closed simultaneously or when the processed material is taken out with the door open, and the life of the seal is short and vacuum sealing is likely to fail. Here, a conventional door device for a vacuum heat treatment furnace will be explained with reference to FIG.

A heating chamber 3 is provided inside the furnace body 1 by a heat shield 2, and a processed material 4 is housed in the heating chamber 3 and heated. 5
is a partition wall that makes the inside of the furnace body 1 an airtight chamber, and the partition wall 5 is provided with an opening θ for taking out the processed material. The opening 6
A drive shaft 1 is horizontally provided above the partition wall 5 on the opposite side of the heating chamber, and a door body 8 is fixed to the drive shaft 1 so as to be opened and closed by rotation of the drive shaft 1.

A shielding door 10 is provided on the door body 8 via a parallel link 9 that is biased to rotate in a clockwise direction, and the door body 8 is connected to the opening 6.
In the case of rIJM, a shielding door 10 closes off the heating chamber 3. Further, an arm 11 is fixed to the drive shaft 1, and a link plate 14 connects the arm 11 to a conveyor 13 which is tiltable about a fulcrum 12.

15 in the figure is a seal ring, which is provided on the partition wall 5 side,
This provides an airtight seal between the door body 8 and the partition wall 5. or,
A seal ring cover 16 is moved up and down by a cylinder 17 and covers the upper part of the seal ring 15 when the door body 8 is open.

FIG. 1 shows a state in which the outlet of the vacuum heat treatment furnace is closed by a door device. To open the outlet, rotate the drive shaft 1 clockwise and move the door body 8 and shielding door 10 upward. Open the opening of the heat shield 2 and the opening 6 of the partition wall 5.

When the door body 8 is pulled up, the link plate 14
The conveyor 13 is tilted through the door body, becomes horizontal when the door body is fully open (indicated by a two-dot chain line in the figure), and functions as a conveyor for conveying the processed material 4.

Furthermore, when the processed material 4 is carried out, the seal ring 15 is burnt out due to radiant heat from the heated processed material 4. In order to prevent this burnout, the seal ring cover 16 is lowered by the cylinder 11 to cover its upper part.

However, the conventional device described above has the following drawbacks.

(+) Since the seal ring is in a position where it receives direct heat from the shield door of the heating chamber and the processed material being transported, a seal ring cover is required to protect the seal ring. It is structurally extremely difficult to protect. Therefore, the life of the seal ring is shortened and vacuum sealing is likely to become impossible.

(i) Since the door body is opened and closed by circular motion, slippage occurs near the contact area at the top of the door when the door body is opened and closed, and this slippage causes wear and damage to the seal ring or galling between the shielding door and the heating chamber. easy.

0ii1 Since the door body opens above the side where the processed material moves,
This places restrictions on the height of the objects to be processed, reducing the space available for passage.

(F) There are two or more combined operations such as opening and closing of the door body and lifting and lowering of the seal ring cover, and the control of the actuator for these operations becomes complicated.

[Objective of the Invention 1] The present invention is such that the opening/closing operation is performed by the actuator 1, and in the open state, the seal ring provided on the door side moves to a position where it does not receive radiant heat from the processing object or the shielding door, and the door body itself It is an object of the present invention to provide a door device which prevents the seal ring from slipping due to the movement of the seal ring, thereby solving the drawbacks of the prior art described above.

[Structure of the Invention] The present invention has an opening/closing arm fixed to a rotatable opening/closing shaft provided outside the path of the processed material, a door body with a seal ring attached to the opening/closing arm, and the opening/closing movement of the door body. A door reversing device that rotates the door body is engaged with the door body, and by rotating the opening/closing shaft, the door can be opened and closed, and in the open state, the door body is reversed and the material to be processed is removed from the path. It is designed to move.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIGS. 2 and 3 are front views of embodiments of the present invention, respectively;
A front view is shown, and the left half view of FIG. 3 shows the open state, and the left half view shows the open state. In FIGS. 2 and 3, the same parts as in FIG. 1 are given the same reference numerals.

An opening/closing shaft 20 is rotatably provided below the opening 6 on the waste heat chamber 3 side of the partition 5, and one end of the opening/closing shaft 20 projects from the furnace body 1. A lever 21 is attached to the protruding end and connected to a cylinder (not shown) so that the cylinder can rotate the opening/closing shaft 20 by a required angle.

An opening/closing arm 22 is fixed near both ends of the opening/closing shaft 20, and the door body 8 is pivotally supported at the tip of the opening/closing arm 22 via a connecting shaft 23. A shielding door 10 is attached to the heating chamber 3 side of the door body 8 via a parallel link 9, and a conveyor 24 is attached to the waste heat chamber side. Two guide rollers 25 are pivotally attached to both end faces of the door body 8, and are fitted into guide grooves 27 of a swing rail 26, which will be described later.

The swing rail 26 has a smoothly bent L-shape,
One end is pivotally supported in the vicinity of a fixed conveyor 28 provided at a required distance from the opening 6 so as to be swingable. The swing rail 26 has a single-shaped guide groove 2 as described above.
1 is bored, and a guide roller 25 is fitted therein. or,
The other end of the swing rail 26 is slidably clamped by a rail support 30 attached to the side surface of the furnace body 1 via a seat 29, so that the swing rail 26 can swing without wobbling.

In addition, 31 in the figure is a fixed conveyor installed in the heating chamber,
Further, the seal ring 32 is attached to the door body 8.

The operation of the above device will be explained below with reference to FIGS. 4 to 8.

FIG. 2 shows the door device in an open state, and from the state shown in FIG.
The llrIl axis 20 is rotated in the counter-time axis direction 0. Opening/closing shaft 2
0 rotation, the opening/closing arm 20 also rotates in the counterclockwise iU direction, and the connection @23 also moves in an arc.

By the movement of the connection 0I123, the door body 8 pivotally supported on the connection shaft 23 and the shielding door 10 attached to the door body 8 via the parallel link 9 are separated from the partition wall 5 and the heating chamber 3, respectively. The movement of the door body 8 is transmitted to the swing rail 26 via the guide roller 25, and the swing rail 26 also swings counterclockwise. As the swing rail 26 swings, the lower guide roller 25 provided on the door body 8 reaches the bent portion of the guide groove 21, and the door body 8 itself rotates clockwise.

As a result, the counterclockwise rotation of the R closing arm 22 and the clockwise rotation of the door body 8 are offset, and the door body 8 (seal ring 32
) until they are separated by the partition wall 5'' is a parallel movement, and there is no slippage between the seal ring 32 and the partition wall 5 (FIG. 4).

When the opening/closing shaft 20 is further rotated, the connecting shaft 23 is further separated from the opening 6. Also, the guide roller 25 is the swing rail 2G.
is pushed up in the counterclockwise direction, and relative to the swing rail 26, the lower guide roller 25 moves horizontally along the guide groove 21, and the upper guide roller 25 descends. That is, the door body 8 is moved away from the opening 6 and rotated clockwise to be reversed (FIGS. 5 and 6).

When the opening/closing shaft 20 is further rotated, both the upper and lower guide rollers 25 reach the horizontal portion of the guide groove 27, and the swing rail 26 is reversed to move in the direction of the time crystal 1 (FIG. 7).

FIG. 8 shows the final fully open state, in which the door body 8 is completely turned over with the seal ring mounting surface facing downward, and the guide roller 25 is connected to the fixed conveyor 28.

In the fully open state, there are no components of the door device above the conveyor 24, and there is no space above the conveyor 24.

When the door is opened and the processed material 4 is extracted or loaded, the fixed conveyors 28 and 31 are bridged by the conveyor 24, so that the processed material 4 can be smoothly moved. Furthermore, since the seal ring mounting surface of the door body 8 faces away from the passage of the processed material 4, and the heated surface of the shielding door 10 also faces away from the seal ring mounting surface, the seal The ring 32 is completely shielded from the radiant heat from the workpiece 4 and the shield door 10.

When closing the frontage part 6, the opening/closing shaft 20 is turned clockwise to reach the state shown in FIG. 2.

In the above embodiment, the door body is integrated with the conveyor and moved to the bottom of the passage for processed products and reversed. However, it may be moved upward or to the side of the passage and reversed, and the door body is not necessarily connected to the conveyor. It does not have to be integrated with the conveyor.

[Effects of the Invention] As described above, according to the present invention, (1) the seal ring does not receive heat from the processed material, etc., resulting in a longer service life; Of) the movement of the door immediately before opening/closing is perpendicular to the contact surface of the bulkhead; This prevents slippage, prevents abrasion and damage to the seal ring, and allows for smooth opening and closing.0 Since the equipment components are stored on the opposite side of the processing material passage, the passage space is widened. Since only one actuator is required for the opening/closing operation, excellent effects such as a simplified control system and structure can be achieved.

Fig. 1 is a plan view of the location of a conventional device, Fig. 2 is a plan view of the device according to the present invention, and Fig. 3 is a front view of the same device, with the left half in the open state and the right half in the open state. 4 to 8 are explanatory views of the operation of the device.

Reference numeral 4 indicates an object to be processed, 8 a door body, 20 an opening/closing shaft, 22 an opening/closing arm, and 26 a swing rail.

Patent applicant Ishikawajima Harima Heavy Industries Co., Ltd. Patent applicant Iwakuni Manufacturing Co., Ltd. @1 Figure 7 @Figure 4 Figure 6 Figure 5 N U Figure 7

Claims (1)

[Claims] 1) A door in which an opening/closing arm is fixed to a rotatable opening/closing shaft provided outside the path of the processed material, a door body with a seal ring is pivotally attached to the opening/closing arm, and the door body is rotated by the opening/closing movement of the door body. A door device for a vacuum heat treatment furnace, characterized in that a body reversing device is engaged with the door body.