JPH08285461A - Mesh belt conveyer type atmosphere furnace - Google Patents

Abstract

PURPOSE: To obtain a mesh belt conveyer type atmosphere furnace where the consumption of atmosphere gas can be reduced. CONSTITUTION: At a mesh belt conveyer type atmosphere furnace, a rider 7 loaded with workpieces is carried into the furnace by a mesh belt conveyer 2. An entrance throat 11 and an exit throat 16 that are at least twice the length of the rider 7 are respectively provided on the entrance and exit sides of a furnace chamber 5 and partitions 9 are erected so that they face at least either the front or rear part of the rider 7 with gaps remaining between the inside walls of the throats 11 and 16 and the upper edges and the right and left side edges.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an atmosphere furnace in which a rider loaded with products to be processed is conveyed in a furnace by a mesh belt conveyor, and the products to be processed are subjected to atmospheric brazing and heat treatment in the furnace chamber.

[0002]

2. Description of the Related Art In an atmospheric furnace of this type, a lidar loaded with products to be treated is continuously charged into the furnace chamber at a small interval in the front and rear. Therefore, it is not possible to provide a partition door that opens and closes each time the rider passes, and if the processing material becomes large, a large amount of atmospheric gas is introduced into the furnace chamber in order to prevent oxidation of the processing material due to inflow of outside air from the inlet / outlet of the furnace. It was uneconomical to send it.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a mesh belt conveyor type atmospheric furnace capable of reducing the amount of atmospheric gas used.

[0004]

MEANS TO SOLVE THE PROBLEMS A mesh belt conveyor type atmospheric furnace of the present invention is a mesh belt conveyor type atmospheric furnace in which a rider loaded with treated products is conveyed inside the furnace by a mesh belt conveyor. On the side, an inlet throat and an outlet throat each having a length at least twice the length of the rider are provided, and at least one of a front portion and a rear portion of the rider has an upper edge portion on an inner wall surface of each throat and It is characterized in that the partition walls opposed to each other with a clearance at the left and right edges are vertically fixed.

Further, the position of the entrance throat near the furnace chamber,
Providing an intermediate door at at least one of the exit side throats near the furnace chamber prevents outside air from entering the furnace at the start of charging the rider group into the entrance side throat or at the end of delivery from the exit side throat. It is particularly preferable because it can.

[0006]

In the mesh belt conveyor type atmosphere furnace of the present invention, when the rider loaded with the processed products passes through the inlet throat and the outlet throat, the partition wall erected and fixed on the rider functions as a partition wall to move. The opening area that communicates with the outside of the throat is reduced to a small area, and the length of the rider is 2
Since at least one partition wall (at least two partition walls when the rider interval is 0) is always present in the throat having a length more than twice as long as the rider is passing through the throat, the partition wall extends from the outside of the furnace through the throat section to the inside of the furnace. Only a small amount of atmospheric gas is needed to prevent the outside air from entering the room.

If an intermediate door is provided at a position closer to the furnace chamber on the entrance side throat, the leading rider is located near the intermediate door when the rider group starts to enter the furnace interior (when processing of one lot of processing material group starts). By closing the intermediate door until the partitioning action is achieved by the partition wall, the outside air from the inlet side throat inlet part when the inlet door is opened at the beginning of the furnace interior insertion (when the leading lidar is charged) is closed. Intrusion into the furnace can be prevented.

If an intermediate door is provided at a position close to the furnace chamber on the exit side throat, the last rider is positioned at the intermediate door position when the rider group finishes sending out of the furnace (when one lot of processed product group has finished processing). By closing the intermediate door at the time of passing through, it is possible to prevent outside air from entering the furnace from the exit side throat outlet portion before closing the exit door at the time of ending the delivery outside the furnace (when sending the last lidar).

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, 1 is an atmosphere brazing furnace equipped with a mesh belt conveyor 2, which is a heating chamber 3 and a cooling chamber 4.
And a processing chamber 6 (see FIG. 2) composed of a base metal and a brazing filler metal is loaded on a rider 7, and the brazing filler metal is melted in the heating chamber 3 during transportation in the furnace to cool the cooling chamber. In step 4, brazing is performed to join the brazing material to the base material. The heating chamber 3 is provided with a heating element such as an electric heater, and the cooling chamber 4 is provided with a cooling air blowing means, but these are known and their illustration is omitted. Also, illustration of the support means for the mesh belt 2a of the mesh belt conveyor 2 inside the heating chamber 3 and outside the furnace, and illustration of the treatment material 6 in FIG. 1 are omitted for simplification.

Reference numeral 11 denotes an inlet throat connected to the inlet 3a side of the heating chamber 3, and its length X is at least twice the length L of the rider 7. Reference numeral 12 is an entrance door of the entrance 13 of the entrance side throat 11. Reference numeral 16 denotes an outlet throat continuously provided on the outlet 4a side of the cooling chamber 4, and the length Y thereof is twice or more the length L of the rider 7. Reference numeral 17 denotes an exit door of the exit 18 of the exit throat 16. The entrance door 12 and the exit door 17 are driven to open and close by a known opening and closing drive device such as a pneumatic cylinder or a motor, and when closed, each door reaches a position where its lower edge faces the mesh belt 2a with a slight clearance. , Is driven downward.

On the other hand, the rider 7 is, as shown in FIG. 3, a front end of a processing material support 8 made of a breathable pallet-like body (in this embodiment, a bent steel plate having a large number of holes punched in the bottom surface). A partition wall 9 formed by bending a steel plate and providing a reinforcing collar portion at the edge portion is fixed to the portion (the end portion on the advancing side) in a partition shape by bolting. As shown in FIG. 2, the front shape of the partition wall 9 is such that a small gap G is formed between the inner wall surface of the entrance side throat 11 and the upper edge portion 9a and the left and right side edge portions 9b of the partition wall 9, It has an outer shape and dimensions close to the cross-sectional shape of the inner wall surface (thus, the shape of the inlet 13). Also, the inner wall surface of the exit side throat 16 (hence the exit 1
8) also has the same sectional shape as the entrance side throat 11.

The above clearance G is used when finishing the wall surfaces of the inlet side throat 11 and the outlet side throat 16, the dimensional accuracy of the partition wall 9, variations in the rider mounting position on the mesh belt 2a, and when moving with the mesh belt 2a. Considering vertical and horizontal movements of the rider 7, it is desirable that the partition wall 9 be as small as possible without coming into contact with the inner wall surface of each throat.
It is good to set it to about mm. In this embodiment (height H = 380 mm, h = 370 mm, width W = 490 mm in FIG. 2),
The clearance G was set to 20 mm.

In the atmosphere brazing furnace 1 having the above structure, the processing material 6 is loaded on the rider 7 having the partition wall 9 described above,
Atmosphere brazing is carried out while being conveyed in the furnace by the mesh belt conveyor 2. At this time, at least one rider 7 and therefore at least one partition wall 9 exist in the inlet side throat 11 and the outlet side throat 16 as long as the distance between the riders 7 is not too large. The opening area that communicates with the outside is narrowed by this partition wall 9, and the area corresponding to the clearance G between the partition wall 9 and the inner wall surface of each throat portion (specifically, a clearance corresponding to the thickness of the mesh belt is added thereto) The inside and outside will communicate.

The opening area of the clearance G is sufficiently smaller than the areas of the inlet 13 and the outlet 18 of each throat, that is, the areas of the inlet 3a of the heating chamber 3 and the outlet 4a of the cooling chamber 4, so that the clearance is small. A small amount of atmospheric gas is supplied into the furnace chamber 5 in order to prevent outside air from entering the furnace from the outside, and this reduced small amount of outflow gas ensures entry of outside air into the furnace from outside the furnace. Be blocked by.

The furnace of this embodiment (length L of the rider 7 = 60)
0mm, width S = 450mm, throat length X = 3000
mm, Y = 2400 mm, the shape of the inner wall surface of the throat and the clearance G are as described above. ), The amount of atmospheric gas (endothermic gas in this embodiment) used is about 1 compared with the case of using a conventional lidar having only the processing material support 8 having no partition wall 9.
It could be reduced to / 5.

Next, another embodiment of the present invention will be described with reference to FIGS. In the figure, reference numeral 21 denotes an entrance-side intermediate door provided at a position closer to the heating chamber 3 of the entrance-side throat 11, 22 denotes an exit-side intermediate door provided at a position closer to the cooling chamber 4 of the exit-side throat 16, which is an air cylinder. It is driven to open and close by a known opening and closing drive device, and at the time of closing, each intermediate door is driven to a position where its lower edge faces the mesh belt 2a with a small clearance. The other structure is the same as that of the above-described embodiment, the same parts are designated by the same reference numerals and illustrated, and the detailed description thereof is omitted. It should be noted that the processing material 6 is not shown in FIG. 4 as well.

In the atmosphere brazing furnace 20 of this embodiment, the outside air inside the furnace at the start of entering the lidar group into the furnace and at the end of sending out from the furnace, that is, at the start and end of processing of one lot of the processing material group. The invasion can be prevented, and the operation at the time of loading the rider is as shown in FIG. That is, the entrance door 12 and the intermediate door 21 are closed until the rider group reaches the entrance 13 of the entrance throat 11, and the leading rider 7 loaded with the processing material 6 reaches the vicinity of the entrance door 12. Then, the entrance door 12 is opened as shown in FIG. Then, when the leading rider 7 reaches the vicinity of the intermediate door 21, as shown in FIG.
Open.

Thus, when the entrance door 12 is opened, the intermediate door 21
The inside of the furnace chamber 5 and the outside of the furnace are in communication with each other over the entire area of the inlet 13 to prevent outside air outside the furnace from entering the inside of the furnace chamber 5, and the inlet side of the intermediate door 21 is closed. After opening the intermediate door 21, the outside air that has entered the chamber is returned to the outside of the furnace together with the atmospheric gas from the inside of the furnace chamber 5. And both doors open Figure 5
In the state of (c), the rider charging is continued, the last rider 7 of the rider group passes through the entrance 13, and then the entrance door 12 is closed as shown in FIG. If the door 21 is closed, the amount of atmospheric gas released from the inlet throat 11 can be further reduced by closing the double door.

When sending out the processed rider group, the exit door 17 and the intermediate door 22 of the exit side throat 16 are closed as shown in FIG. When the door reaches the vicinity of the intermediate door 22, the intermediate door 22 is opened. The first rider 7 is the exit door 17
As shown in Fig. 6 (b), the exit door 1
Open 7 Then, the lidar delivery is continued in the state shown in FIG. 6 (c) with both doors opened, and when the rearmost rider 7 passes the position of the intermediate door 22, the intermediate door 22 is closed as shown in FIG. 6 (d). 7 passes through the exit door 17 position, then exit door 17
Close.

In this way, when the rearmost rider 7 is discharged from the outlet 18 or after the partition wall 9 of the rider 7 has passed through the outlet 18, the intermediate door 22 remains open even if the outlet door 17 is open. Since it is closed, the inside of the furnace chamber 5 and the outside of the furnace are at the outlet 1.
The whole area of 8 is in a communicating state, and the outside air outside the furnace is prevented from entering the furnace chamber 5. Further, after the exit door 17 is closed, the amount of atmospheric gas released from the exit side throat 16 can be further reduced by closing the double door.

The present invention is not limited to the above-described embodiments. For example, the specific structure of the rider 7 may be other than the above, and the partition walls 9 may be provided at both the front and rear portions of the rider. Well, in this case, by increasing the number of partition walls, it is possible to prevent outside air from entering the furnace by a smaller amount of atmospheric gas. Further, the intermediate door may be provided only on one of the entrance throat 11 and the exit throat 16.

In addition to the atmosphere brazing furnace, the present invention also
It can be widely applied to various kinds of mesh belt conveyor type atmosphere furnaces such as atmosphere heat treatment furnaces.

[0023]

As described above, according to the present invention,
The partition wall that is erected and fixed on the rider restricts the opening area of the inlet throat and outlet throat that communicates with the outside of the furnace to a small area, so as to prevent outside air from entering the furnace from outside the furnace through the throat. A small amount of ambient gas can be used.

Further, according to the second aspect of the present invention, by opening and closing the intermediate door, the furnace for outside air at the start of charging of the rider group into the inlet throat and / or at the end of delivery from the outlet throat. It is possible to prevent intrusion.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a mesh belt conveyor type atmosphere brazing furnace according to an embodiment of the present invention with a part of an intermediate portion omitted.

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

3 is a perspective view of the rider in FIG. 1. FIG.

FIG. 4 is a vertical cross-sectional view showing a mesh belt conveyor type atmosphere brazing furnace according to another embodiment of the present invention with a part of the intermediate portion omitted.

FIG. 5 is an explanatory view (longitudinal sectional view) of a rider charging operation in the inlet side throat portion of the furnace shown in FIG. 4;

6 is an explanatory view (longitudinal sectional view) of a rider delivery operation in the exit side throat section of the furnace of FIG. 4;

[Explanation of symbols]

1 ... Atmosphere brazing furnace, 2 ... Mesh belt conveyor,
3 ... Heating chamber, 4 ... Cooling chamber, 5 ... Furnace chamber, 6 ... Processing material, 7 ...
Rider, 8 ... Treatment material support, 9 ... Partition wall, 11 ... Inlet throat, 12 ... Inlet door, 13 ... Inlet, 16 ... Outlet throat, 17 ... Exit door, 18 ... Exit, 20 ... Atmosphere brazing furnace, 21 ... Intermediate door, 22 ... Intermediate door.

Claims (2)

[Claims] 1. A mesh belt conveyor type atmospheric furnace in which a lidar loaded with treated products is conveyed in the furnace by a mesh belt conveyor, and the length is at least twice the length of the lidar at the inlet side and the outlet side of the furnace chamber. An inlet side throat and an outlet side throat are provided, and at least one of the front part and the rear part of the rider is erected and fixed to the inner wall surface of each of the throats so that the upper edge portion and the left and right side edge portions face each other with a clearance. A mesh belt conveyor type atmosphere furnace characterized by that. 2. The mesh belt conveyor type atmospheric furnace according to claim 1, wherein an intermediate door is provided at at least one of a position near the furnace chamber of the inlet throat and a position near the furnace chamber of the outlet throat.