JPH10132464A - Opening/closing door of heat treatment furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a facility expenditure by a method wherein an opening/ closing door is made of a sheet of plate acting in an upper stage conveyor passage and a lower stage conveyor passage, the door is lowered correspondingly when the upper stage conveyor passage is opened and in turn lifted up correspondingly when the lower stage conveyor passage is opened. SOLUTION: Upper and lower two-stage conveyor rollers 21, 22 are arranged within a heat treatment furnace 11. An upper stage conveyor passage 31 for use in transporting item to be treated into the furnace is formed above the upper stage conveyor roller 21. A lower stage conveyor passage 32 for use in transporting the item to be treated into the furnace is formed above the lower-stage conveyor roller 22 below the upper stage conveyor roller 21. Then, there is provided an opening/closing door 43 of a sheet of plate acting for the upper stage conveyor passage 31 and the lower stage conveyor passage 32. When the upper stage conveyor passage 31 is opened, the opening/closing door 43 is lowered correspondingly and in turn when the lower stage conveyor passage 32 is opened, the opening/closing door 43 is lifted up correspondingly. With such an arrangement as above, it is possible to reduce an expenditure of facility and a frequency of occurrence of trouble.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door for a heat treatment furnace. For example, when a metal material is placed on a tray and continuously heat-treated while being conveyed in the furnace, a tunnel-type heat treatment furnace in which conveyance rollers are laid in the furnace is used. In such a heat treatment furnace, there is a furnace in which a transfer path for an object to be processed is formed in two stages in the furnace in order to reduce the installation area and improve productivity and thermal efficiency. The present invention relates to a door for such a heat treatment furnace.

[0002]

2. Description of the Related Art Conventionally, as a door for a heat treatment furnace in which a transfer path for an object to be processed is formed in a furnace in two stages, an upper transfer path door and a lower transfer path door are used. Opening doors are used. These doors raise the upper door when opening the upper transport path, and lower the lower door when opening the lower transport path,
Therefore, in the conventional heat treatment furnace in which the transfer path for the object to be processed is formed in the furnace in two stages, the opening and closing door and its elevating mechanism are separately provided in two sets, one for the upper transfer path and one for the lower transfer path. Have been. However, such conventional doors include:
Including the elevating mechanism, two separate sets are provided for the upper transport path and the lower transport path, respectively. Therefore, there are disadvantages that the equipment cost is increased, the structure is complicated, and the frequency of failure is high. .

[0003]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is that a conventional door for a heat treatment furnace in which a transfer path for an object to be processed is formed in an upper and lower stage in a furnace is provided. Since two sets of mechanisms are separately provided for the upper transport path and the lower transport path, equipment costs are increased, the structure is complicated, and failures occur frequently.

[0004]

According to the present invention, there is provided an opening / closing door of a heat treatment furnace in which a transfer path for an object to be processed is formed in an upper and lower stage in a furnace. It is made of a single sheet that is also used for the lower transport path, and is configured to descend by that amount when opening the upper transport path, and to rise by that amount when opening the lower transport path. It relates to the opening and closing door of the heat treatment furnace.

[0005] The opening and closing door according to the present invention is provided at an inlet or an outlet of a heat treatment furnace in which a transfer path for an object to be processed is formed in two stages in the furnace. The opening / closing door according to the present invention is formed of a single sheet that is used for both the upper transport path and the lower transport path. Instead of separately providing two sets of the opening / closing door and its elevating mechanism for the upper transport path and the lower transport path as in the related art, one set is provided for both transport paths. The opening / closing door according to the present invention is configured such that when the upper conveying path is opened, it is lowered by that amount, and when the lower conveying path is opened, it is raised by that amount. Known driving means such as cylinder driving and motor driving can be applied to the raising and lowering of the door, and known regulating means such as a timer, a limit switch, and a photoelectric tube can be applied to control of the lifting stroke of the door. .

According to the present invention, since only one set of the opening / closing door and its elevating mechanism is used for the upper and lower transport paths, the equipment cost can be reduced and the structure can be simplified. , And the frequency of failures can be reduced.

[0007]

FIG. 1 is a front view illustrating a door according to the present invention, and FIG. 2 is a longitudinal sectional view of the same door as FIG. 1 in a furnace length direction. The opening / closing door shown in FIGS. 1 and 2 is provided at the entrance of a heat treatment furnace in which a transfer path for an object to be processed is formed in two stages in the furnace. The heat treatment furnace 11 is constructed in a horizontally long tunnel shape, and has two upper and lower transfer rollers 2 in the furnace.
1 and 22 are laid, and an upper transport path 31 for transporting the workpiece in the furnace above the upper transport roller 21.
A lower transport path 32 for transporting the workpiece in the furnace is formed above the lower transport roller 22 below the upper transport roller 21.

[0008] On the front side of the heat treatment furnace 11, the upper conveying path 3
An entrance 41 shared by the first and lower conveying paths 32 is provided, and a peripheral portion 42 of the heat treatment furnace 11 forming the entrance 41.
The opening and closing door 43 is slidably contacted. In FIG.
The peripheral portion 42 is inclined downward to the right, so that the opening / closing door 43 is in close contact with the peripheral portion 42 by its own weight, and closes the entrance 41, that is, the upper and lower two-stage transport paths 31 and 32.

A shaft 51 is supported in the upper part on the front side of the heat treatment furnace 11 in the furnace width direction. Large diameter sprockets 52 and 53 are attached to the shaft 51, and chains 61 and 62 are attached to the sprockets 52 and 53. Is locked. The door 43 is connected to the chain 6 on both sides in the furnace width direction.
1 and 62 are suspended from the lower ends. A large diameter sprocket 54 is attached to the end of the shaft 51,
A chain 63 is locked to the sprocket 54,
A balance weight 71 is suspended from the lower end of the chain 63. The shaft 51 has a small-diameter sprocket 55 between the sprocket 53 and the sprocket 54 (the sprockets 52 to 54 have the same diameter in the drawing, and the sprocket 55 is a sprocket 52 to 5).
4, a chain 64 is fixed to the sprocket 55, and the chain 6
The lower end of 4 is connected to the upper end of a cylinder rod 73 of an air cylinder 72 attached to the heat treatment furnace 11.
Four key pieces 81 to 84 are provided on the circumference of the shaft 51.
These key pieces 81 to 84 are designed to urge limit switches 91 to 94 arranged in the furnace width direction on the upper front side of the heat treatment furnace 11.

When the upper transport path 31 is opened, the cylinder rod 7 is opened via a controller (not shown, the same applies hereinafter).
3 is raised, and the opening / closing door 43 is lowered by its own weight by a considerable amount in the transport path 31. The lowering position of the door 43 at this time is controlled by the key piece 81 urging the limit switch 91. When closing and returning the opened upper conveyance path 31 to the original state, the cylinder rod 73 is lowered through the control device,
The opening / closing door 43 is raised by a considerable amount in the transport path 31. At this time, the ascending position of the door 43 is controlled by the key piece 82 urging the limit switch 92.

When the lower transport path 32 is opened, the cylinder rod 73 is lowered via the control device, and the transport path 32 is opened.
, The opening / closing door 43 is raised by a considerable amount. At this time, the ascending position of the opening / closing door 43 is controlled by the key piece 83 urging the limit switch 93. When closing and returning the opened lower conveying path 32 to its original position, the cylinder rod 73 is raised via the control device, and the opening / closing door 4
3 is lowered by its own weight. At this time, the lowering position of the door 43 is controlled by the key piece 84 urging the limit switch 94.

Although a detailed description is omitted, the opening and closing door 43 is moved up and down by a corresponding amount in the upper transport path 31 and the lower transport path 32 in the same manner, so that both transport paths 31 and 32 are moved.
Can be opened and closed at the same time.

[0013]

As is apparent from the above description, in the present invention described above, only one set of the opening / closing door and its lifting / lowering mechanism are provided so as to serve both as the upper transport path and the lower transport path.
There are effects that the equipment cost can be reduced, the structure can be simplified, and the frequency of occurrence of failure can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view illustrating a door according to the present invention.

FIG. 2 is a longitudinal sectional view in the furnace length direction showing the same opening and closing door as in FIG.

[Explanation of symbols]

11: heat treatment furnace, 21, 22: transport roller, 31, 32: transport path, 41: inlet, 43
..Opening and closing doors, 51 ... Shafts, 52-54 ... Sprockets, 61-64 ... Chains, 71 ... Balance weights, 72 ... Air cylinders

Claims (1)

[Claims] An opening / closing door for a heat treatment furnace in which a transfer path for an object to be processed is formed in an upper and lower stage in a furnace, wherein the open / close door is used as an upper transfer path and a lower transfer path. An opening / closing door for a heat treatment furnace, wherein the opening / closing door is made of a material, and is configured to lower by an amount corresponding to opening the upper conveying path, and to rise by an amount corresponding to opening the lower conveying path.