JP3060572B2 - Continuous heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating apparatus which allows a high-temperature gas to flow through a plurality of workpieces so that the workpieces can be uniformly heated.

[0002]

2. Description of the Related Art In a heating apparatus of this type, an opening for taking in and out an object to be processed is provided on one side of a heating chamber, and a high-temperature gas is fed into the heating chamber. In addition, a gas circulating heating device that collects gas passing through the heating chamber from the heating chamber, heats the collected gas to a high temperature, and sends the gas to the heating chamber again is connected.

[0003]

In this conventional heating apparatus, the object to be processed must be taken in and out through the one opening, so that when heating a large number of objects to be processed one after another, the efficiency is extremely high. There was a problem that it was bad. In addition, the larger the heating chamber is, the more gas must be circulated in order to process a large number of workpieces, so that there is a problem that the equipment cost and the running cost increase.

The present invention has been made to solve the above-mentioned problems (technical problems) of the prior art. When heating a plurality of objects to be processed one after another, the objects to be processed are caused to flow from one side to the other side. In the flowing process, the object to be processed can be heated, so that a plurality of objects to be processed can be efficiently heated, and the gas flow rate for heating the object to be processed is small. It is an object of the present invention to provide a continuous heating device capable of keeping equipment costs and running costs for gas distribution low.

[0005]

SUMMARY OF THE INVENTION A continuous heating apparatus according to the present invention is capable of passing a plurality of objects through an internal processing space from an inlet at one end and in a cascade toward an outlet at the other end. One of the inlet side and the outlet side of the cylindrical heating chamber is connected to an inlet of a circulating heating means for sending gas into a processing space in the heating chamber, and the other side is connected to the other side. A rectifying space is provided at a position facing the inlet in the heating chamber, and a rectifying space is disposed at a position opposite to the inlet in the heating chamber to collect the gas passed through the processing space of the heating chamber. A rectifying plate is disposed on the processing space side of the space, and the atmosphere gas flowing from the inlet to the processing space is passed from the rectifying space to the rectifying plate, and the flow of the atmosphere gas in the processing space is controlled by the rectifying plate. Along the column direction of the workpiece The circulation heating means, while sending gas into the heating chamber from the inlet, recovers the gas in the heating chamber from the recovery port, and a blower for returning the gas in the recovery port to the inlet. And a heater for heating the gas returning to the inlet.

[0006]

A large number of objects to be processed enter the heating chamber from the inlet at one end. In the heating chamber, the object to be processed is heated by a high-temperature gas flowing in the heating chamber from the inlet side to the outlet side or in the opposite direction. The heated object exits the outlet at the other end.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In FIG. 1, reference numeral 1 denotes a heat treatment furnace. This heat treatment furnace 1 has a structure in which two continuous heating devices 2 and 3 and a rear chamber 4 are connected in tandem. The continuous heating device 2 is, for example, for raising the temperature of an object to be processed, and is also called a heating furnace.
Further, the continuous heating device 3 is for soaking the object to be treated, and is also called a soaking furnace. Each of the continuous heating devices 2 and 3 may perform other heat treatment.

Next, the continuous heating device 3 will be described in detail. The heating device 2 has the same configuration as the heating device 3, and the rear chamber 4 has the same configuration except that there is no gas circulation heating means described later. The same reference numerals are given to the same reference numerals, and duplicate description will be omitted. Reference numeral 5 denotes a furnace body, which is formed in a rectangular cross-sectional shape as shown in FIG. 2A, and is provided with a partition wall 6 for partitioning upper and lower spaces. Reference numeral 8 in FIG. 1 denotes a heating chamber in the heating device 3, which is formed in a cylindrical shape by the upper half portion of the furnace body 5 and the partition wall 6. Reference numeral 9 denotes an inlet provided at one end of the heating chamber 8, and reference numeral 10 denotes an outlet provided at the other end. In this example, the lifting device (not shown) is vertically movable, but may be opened and closed by lateral movement (in a direction perpendicular to the paper surface). Reference numeral 14 denotes a rail provided in the heating chamber 8, which is attached to the furnace body 5 (not shown), and along which the tray 15 can be guided from the entrance 9 to the exit 10. . In FIG. 2A, reference numeral 15a denotes wheels of the tray 15 rolling on the rails 14. 16, 16,..., 16 indicate a plurality of objects to be processed which are mounted on the tray 15 in a suspended manner in a plurality of columns.
The workpiece 16 is, for example, a sintered product, and as shown in FIG. 2A, each piece 16 of a holding frame 16a formed in the shape of a scale.
b, a large number of sintered products 16c are attached to each of them. The space above the rail 14 in the heating chamber 8 is a space for disposing the transfer device, and there is shown in FIGS. 2A and 2B for transferring the tray 15 along the rail 14. Such a transport device 18 is provided. The transfer device 18 will be described later.

Referring again to FIG. 1, inside the heating chamber 8, there are provided a processing space 20 for processing the object to be processed, a rectifying space 21 on the inlet side of the processing space 20, and a rectifying space on the outlet side. A space 22 is defined. Reference numeral 23 denotes a rectifying plate provided between the processing space 20 and the rectifying space 21, and a perforated plate having a large number of through holes 23a formed in a uniform arrangement as shown in an enlarged view, for example, a punching metal is used. The position can be changed between a position between the spaces 20 and 21 by a lifting mechanism (not shown) and a retracted position retracted therefrom. Reference numeral 24 denotes a rectifying box provided in the rectifying space 22, which has a number of rectifying blades 25, and is repositioned between a position in the space 22 and a retracted position below the position by an elevating device not shown. It is supposed to be. Next is heating room 8
At the inlet of the atmosphere gas, which is provided on the inlet side of the
Is formed on the partition wall 6 at a position opposed to. Reference numeral 27 denotes a flow opening provided on the outlet side, which is formed on the partition wall 6 at a position facing the flow regulating space 22. Reference numeral 28 denotes a feed port for supplying an atmospheric gas into the heating chamber 8.

Reference numeral 30 denotes a circulation heating means for circulating a high-temperature atmosphere gas in the heating chamber, which will be described below. Reference numeral 31 denotes a communication passage which is formed in a cylindrical shape by the lower half of the furnace body 5 and the partition wall 6. Reference numeral 32 denotes a gas inlet provided at one end of the communication passage 31 and communicates with the distribution port 26. 33
Is a recovery port provided at the other end and communicates with the distribution port 27. Reference numeral 34 denotes a known blower provided in the communication passage 31, and reference numeral 35 shown in FIG. 3 denotes a position of a suction port. The inlet 32 has an outlet of the blower 34. Reference numeral 37 denotes a blower driving motor, which includes a pulley 38, a belt 39, a pulley 40, and a drive shaft 41.
Connected to the fan of the blower 34. 42 is a communicating passage
A guide plate provided in the inside 31 guides the gas passing through the communication passage 31 toward the suction port 35 of the blower 34. 43
Is a heater provided in the communication passage 31, for example, an electric heater is used, but other heaters may be used.

Next, the transfer device 18 will be described with reference to FIG. 47 and 47 are a pair of sprockets which are rotatably mounted on the furnace body 5 using shafts 48 and 48, respectively. Reference numeral 49 denotes a driving device connected to the shaft 48, which rotates the sprocket 47 via the shaft 48. The reference numeral 50 designates a chain extending over both sprockets 47, 47, and a transfer claw 51 for pushing the tray 15 is mounted. In such a transport device, the tray 15 is transported by the transfer claw 51 when the chain 50 rotates in the direction of the arrow in FIG. The transport device 18 may have another configuration.

Next, the heat treatment of the object to be processed by the heat treatment furnace 1 will be described. Door 11 of entrance 9 in heating device 2
Is opened, the current plate 23 is retracted from the transport path of the tray 15 on which the workpiece 16 is mounted, and the tray 15 is
From the rectifying space 21 to the processing space 20.
Thereafter, the entrance 9 is closed by the door 11, and the current plate 23 is lowered to a predetermined position. A rectifying box 24 is raised in the rectifying space 22. The rectification box 24 may be raised in the rectification space 22 in advance. In this state, the blower 34 and the heater 43 are operated. By the operation of the blower 34, the atmospheric gas in the heating chamber 8 reaches the recovery port 33 through the rectifying box 24 and the circulation port 27. The atmosphere gas is heated by the heating device 43 in the process of passing through the communication passage 31 from the recovery port 33, and
It reaches the suction port 35 of 34. Further, the atmospheric gas is blown out from the air inlet 32 toward the circulation port 26 of the heating chamber 8 through the blower 34 and enters the rectification space 21. The atmosphere gas is the current plate 23
, And flows into the processing space 20 from the inlet side to the outlet side along the transfer path of the plurality of objects to be processed 16, 16,... After passing through the processing space 20, the gas again reaches the recovery port 33 through the rectifying box 24 and the circulation port 27. Atmosphere gas is used for processing space
In the state of flowing through 20, there are tandem objects 16
Is heated one after another. Many objects to be processed
Since the heating of 16 is performed by the same atmospheric gas flowing through the processing space 20, the object to be processed in any place can be subjected to substantially uniform heating. When the atmospheric gas flows as described above, the atmospheric gas first flows from the flow opening 26 to the rectifying
It flows into the processing space 20 through the through-hole 23a of the current plate 23. Therefore, the rectifying space 21 functions as a plenum chamber, and the atmospheric gas is blown out from the rectifying plate 23 into the processing space 20 in a state of a uniform flow. Also in the rectifying space 22, the direction of the flow of the atmospheric gas that has passed through the processing space 20 is smoothly directed toward the flow opening 27 by the rectifying blades 25 in the rectifying box 24 there. For this reason, the flow of the atmospheric gas in the processing space 20 becomes extremely uniform, and the heating of the large number of objects to be processed 16 is further uniformed.

When the heating of the object to be processed in the heating device 2 is completed, the operation of the blower 34 and the heater 43 is temporarily stopped, and the rectifying box 24 is retracted into the communication passage 31. Then, the door 11 of the outlet 10 (the inlet 9 of the heating device 3)
Is opened, the current plate 23 in the heating device 3 is retracted, and the tray in the processing space 20 of the heating device 2 is transported toward the processing space 20 in the heating device 3. After the transfer, the door 11 of the entrance 9 is made in the same
Is closed, the rectifying plate 23 and the rectifying box 24 are located at predetermined positions, the blower 34 and the heater 43 are operated, and the soaking target 16 is soaked by the atmospheric gas flowing through the processing space 20. In the heating device 2, after the object to be processed is sent out as described above or in parallel with the feeding, the next object to be processed is loaded into the processing space 20 as described above, and the object to be processed is Is performed.

When the predetermined soaking treatment of the object 16 is completed in the heating device 3, the blower 34 and the heater 43 are temporarily stopped, the rectifying box 24 is retracted and the door 11 is opened, and the object 11 is opened. 16 is sent out into the rear chamber 4. Then, after the workpiece is subjected to a predetermined process in the rear chamber 4, the door 11 of the outlet 10 there is opened, and is sent out to the next stage. In the heating device 3, if a space for receiving the next object to be processed is created by sending some of the objects 16 to the rear chamber 4, heating is completed in the heating device 2 in the same manner as described above. The object to be processed is the processing space 20 of the heating device 3.
Will be charged.

Next, another embodiment will be described. The direction of the flow of the atmospheric gas in the heating chamber 8 may be opposite to that in the above-described embodiment, that is, the direction opposite to the transport direction of the workpiece 16. In that case, the circulation port on the side of the outlet 10 in the heating chamber 8
What is necessary is just to make the inlet port 32 communicate with 27 and the collection port 33 with the circulation port 26 on the side of the inlet 9.

[0016]

As described above, according to the present invention, when the object to be processed is heated, the object to be processed is caused to flow from one side to the other side. And can be passed through the heating chamber 8 and exit from the outlet 10 at the other end, and can be heated in the flowing process. Therefore, there is an advantage that heating can be efficiently performed in the process of continuously transporting a plurality of workpieces. is there.

In addition, as described above, the present invention is an apparatus capable of flowing a plurality of objects to be processed in a cascade from one to the other, and heats a large number of the objects by flowing a high-temperature gas. However, in the present invention, since the flow of the atmosphere gas in the processing space is caused to flow along the column direction of the object to be processed, the flow rate of the high-temperature atmosphere gas is Even if a large number of objects to be processed are connected in a column in the space 20, a relatively small amount of the integral of the cross section of the heating chamber is sufficient. This has the advantage that the blower for gas distribution may be of a relatively small size, which suffices with inexpensive equipment costs, and that the running costs can be reduced.

Further, the heating of the object to be processed in the processing space 20 is performed by flowing an atmospheric gas directed from the inlet into the processing space through the rectifying space 21 through the rectifying plate 23 in the column direction of the object to be processed. Therefore, the flow of the circulating atmosphere gas becomes extremely uniform, and there is an effect that the heating of the large number of objects 16 is further uniformed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a heat treatment furnace.

2A is a sectional view taken along line II-II in FIG. 1, and FIG.

FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1 (note that a part of a partition wall is cut away to show a lower configuration thereof).

[Explanation of symbols]

 8 Heating room 9 Inlet 10 Outlet 16 Workpiece 32 Inlet 33 Recovery port 34 Blower 43 Heater

Claims (1)

(57) [Claims] A cylindrical heating chamber through which a plurality of objects to be processed can pass through an internal processing space from an inlet at one end and pass in a cascade toward an outlet at the other end. One of the inlet side and the outlet side communicates with the inlet of the circulating heating means for feeding the gas into the processing space in the heating chamber, and the other receives the gas passed through the processing space in the heating chamber. The recovery port of the circulation heating means for recovery is connected, and a rectifying space is disposed at a position facing the inlet in the heating chamber, and a rectifying plate is disposed on the processing space side of the rectifying space. The atmosphere gas directed from the inlet to the processing space through the rectifying plate from the rectifying space, so that the flow of the atmospheric gas in the processing space flows along the column direction of the object to be processed. Yes, the circulating heating means A blower for collecting gas in the heating chamber from the recovery port while returning the gas from the recovery port to the supply port, and a heater for heating the gas returning to the supply port while feeding the gas into the heating chamber from the supply port. A continuous heating device comprising: