JP3548771B2 - Heat treatment furnace - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a heat treatment furnace.
[0002]
[Prior art]
FIG. 3 shows a batch-type firing furnace which is one of the conventional heat treatment furnaces.
The batch type firing furnace includes a furnace body 1, a hearth 2 provided at a lower portion of the furnace body 1, a base plate 3 installed at an upper part of the hearth 2, and a heater 4 fixed inside the furnace body 1. , A gas supply pipe 5 and a gas exhaust pipe 6 provided at predetermined positions of the furnace main body 1.
[0003]
The furnace main body 1 has a firing space 7 inside, and a heat insulating material 8 is attached around the firing space 7.
[0004]
The hearth 2 is provided in the lower part of the furnace main body 1, and a material to be fired can be charged into the furnace body 1 by a hydraulic or screw lifting mechanism (not shown), and a box 9 containing the material to be fired is installed. After the object to be fired is fired, it descends to take out the object to be fired.
[0005]
The furnace hearth 2 can be driven to rotate by a motor (not shown) during firing of the object to be fired, and the object to be fired is fired while rotating.
[0006]
The base plate 3 is fixedly mounted on the upper part of the hearth 2 for placing the object to be fired, and is moved up and down together with the hearth 2 and rotated while the object to be fired is taken in and out and fired. .
[0007]
The heaters 4 are made of rod-shaped silicon carbide (SiC) or the like, and a predetermined number of the heaters 4 are vertically fixed around the casing 9 in a firing space 7 inside the furnace main body 1.
[0008]
The gas supply pipes 5 have a rod-like shape, and a predetermined number of the gas supply pipes 5 are provided in the vicinity of the furnace wall 10 in the firing space 7 inside the furnace main body 1 in the vertical direction.
[0009]
The gas exhaust pipe 6 has a rod-like shape, and is installed vertically in the center of the firing space 7 inside the furnace main body 1.
[0010]
Therefore, the box 9 containing the object to be fired rises while being placed on the base plate 3 above the hearth 2, and when installed inside the furnace body 1, the atmosphere introduced from the gas supply pipe 5 Rotational motion is performed under the gas, and heating and firing are performed by radiant heat of a heater 4 fixed inside the furnace main body 1. Exhaust gas generated by firing the object to be fired is discharged from the gas exhaust pipe 6.
[0011]
[Problems to be solved by the invention]
In the above-mentioned batch type baking furnace, the hearth 2 and the base plate 3 fixed on the upper part of the hearth 2 are driven to rotate by a motor (not shown). This causes box collapse.
[0012]
Further, since the hearth 2 including the object to be fired is rotationally driven, a mechanism having a large driving torque is required, which is wasteful and leads to an increase in cost.
[0013]
Furthermore, when the hearth 2 is rotationally driven, the mounting positions of the gas supply pipe 5 and the gas exhaust pipe 6 are limited to the center of the furnace body 1 and the vicinity of the furnace wall 10. When the gas supply pipe 5 or the gas exhaust pipe 6 is installed in the vicinity of 10, a large number of the gas supply pipes 5 or the gas exhaust pipes 6 are required to make the temperature distribution and the atmosphere inside the furnace main body 1 uniform. Required, and maintenance takes time.
[0014]
An object of the present invention is to provide a low-cost heat treatment furnace capable of reliably and uniformly heat-treating an object to be heat-treated.
[0015]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a furnace body having a heat treatment space therein, and a hearth provided at a lower portion of the furnace body. A heater provided inside the furnace main body, a gas supply pipe and a gas exhaust pipe arranged in the furnace main body, and a gas pipe rotation driving means , wherein the gas exhaust pipe includes the gas pipe rotation driving means, They are connected and can be driven to rotate .
[0016]
Further, the present invention is characterized in that the gas supply pipe is connected to the gas pipe rotation driving means, and can be driven to rotate.
[0019]
Further, the present invention is characterized in that the gas supply pipe and the gas exhaust pipe are interlocked with each other via a connector, and can be driven to rotate by the gas pipe rotation drive means.
[0020]
Further, the present invention is characterized in that the gas supply pipes are composed of a plurality of pipes, which are interlocked with each other via a connector, and can be driven to rotate by the gas pipe rotation drive means.
[0021]
Further, the present invention is characterized in that the gas exhaust pipes are composed of a plurality of pipes, which are interlocked with each other via a connector, and can be driven to rotate by the gas pipe rotation drive means.
[0022]
Further, the present invention is characterized in that the gas supply pipe and the gas exhaust pipe each include a plurality of pipes, which are linked with each other via a connecting member, and can be driven to rotate by the gas pipe rotation drive means. Things.
[0023]
Further, the present invention is characterized in that the gas supply pipe is provided with a plurality of holes in a longitudinal direction.
[0024]
Further, the present invention is characterized in that the gas exhaust pipe is provided with a plurality of holes in a longitudinal direction.
[0025]
[Action]
In the heat treatment furnace of the present invention, the object to be heat-treated can be heat-treated without moving the box by rotating the gas tube by the gas tube rotation driving means.
[0026]
Further, the gas pipe can be rotationally driven by compact gas pipe rotation driving means.
[0027]
Further, the gas pipe can be provided at any position of the furnace main body.
[0028]
Further, when the gas supply pipe is connected to the gas pipe rotation drive means and driven to rotate, the gas supply pipe can be rotated according to the controlled rotation of the gas pipe rotation drive means.
[0029]
Further, when the gas exhaust pipe is connected to the gas pipe rotation driving means and driven to rotate, the gas exhaust pipe can be rotated according to the controlled rotation of the gas pipe rotation driving means.
[0030]
When the gas supply pipe and the gas exhaust pipe are connected to the gas pipe rotation driving means and driven to rotate, the gas supply pipe and the gas exhaust pipe are rotated according to the controlled rotation of the gas pipe rotation driving means. be able to.
[0031]
When the gas supply pipe and the gas exhaust pipe are interlocked with each other via a connector and driven to rotate, the gas supply pipe or the gas exhaust pipe is rotated in accordance with the rotation of the controlled gas pipe rotation driving means. And the associated gas supply pipe or gas exhaust pipe can be rotated.
[0032]
In addition, when the plurality of gas supply pipes are interlocked with each other via a coupling tool and are rotationally driven, the plurality of gas supply pipes are interlocked according to the rotation of the controlled gas pipe rotation driving means. Can be rotated.
[0033]
Further, when the plurality of gas exhaust pipes are interlocked with each other via a connecting member and driven to rotate, the plurality of gas exhaust pipes are interlocked according to the rotation of the controlled gas pipe rotation driving means. Can be rotated.
[0034]
When a plurality of gas supply pipes and a plurality of gas exhaust pipes are rotationally driven in conjunction with each other via a connector, a plurality of gas supply pipes and a plurality of gas The pipe and the gas exhaust pipe can be rotated in conjunction with each other.
[0035]
In the case where a plurality of holes are provided in the longitudinal direction of the gas supply pipe, an atmosphere gas can be supplied over a wide range depending on the shape of the holes.
[0036]
Furthermore, when a plurality of holes are provided in the longitudinal direction of the gas exhaust pipe, exhaust can be exhausted to every corner of the heat treatment space.
[0037]
【Example】
Hereinafter, with reference to FIG. 1 and FIG. 2, a batch-type firing furnace which is an embodiment of the heat treatment furnace of the present invention will be described.
As shown in FIG. 1, this batch type firing furnace is a hearth raising / lowering type batch type firing furnace which raises and lowers a hearth 2 to bring a material to be fired into and out of a furnace body 1. A furnace body 1, a hearth 2 provided at a lower part of the furnace body 1, a base plate 3 installed at an upper part of the hearth 2, a heater 4 fixed inside the furnace body 1, The apparatus includes a motor 15 serving as a gas pipe rotation driving means provided at an upper portion, a gas supply pipe 5 provided in the furnace main body 1, and a gas exhaust pipe 6.
[0038]
The furnace body 1 has a firing space 7 as a heat treatment space inside, and a heat insulating material 8 is attached around the firing space 7.
[0039]
The hearth 2 is provided at a lower portion of the furnace main body 1, and an object (not shown) to be fired can be put into the furnace body 1 by a hydraulic or screw lifting mechanism (not shown). After firing the object to be fired, it is lowered to take out the object to be fired.
[0040]
The base plate 3 is fixed to the upper part of the hearth 2 for mounting the object to be fired, and moves up and down together with the hearth 2 when the object to be fired is taken in and out.
[0041]
The heaters 4 are made of bar-shaped silicon carbide (SiC) or the like, and a predetermined number of the heaters 4 are vertically fixed around the box 9 in a firing space 7 inside the furnace body 1.
[0042]
The gas supply pipe 5 has a rod shape and is installed vertically in the center of the firing space 7 inside the furnace main body 1. One end of the gas supply pipe 5 is supplied with an atmospheric gas from outside the furnace main body 1. For this purpose, it protrudes from the upper part of the furnace body 1 to the outside.
[0043]
The furnace main body 1 is fixed to the furnace main body 1 by a heat insulating material 8 on the upper part of the furnace main body 1 by a bearing bearing 11, and two ceramic sprockets 12 are vertically provided at a portion protruding from the upper part of the furnace main body 1. ing. Here, the sprocket 12 is for engaging the ceramic chain 14.
[0044]
Further, the gas supply pipe 5 and the motor 15 are connected via the ceramic chain 14, so that the gas supply pipe 5 can rotate in conjunction with the motor 15, and by controlling the rotation drive of the motor 15, The rotational drive of the gas supply pipe 5 is also controlled.
[0045]
Here, as shown in FIG. 2, the gas supply pipe 5 is provided with a plurality of holes 13 in the longitudinal direction.
The hole 13 is composed of a round hole 13a and a long hole 13b, and a substantially circular round hole 13a and a long hole 13b having a long side in the longitudinal direction are formed in the longitudinal direction at intervals corresponding to the pitch of the firing box 9 respectively. The holes 13a and the long holes 13b are alternately arranged along the circumferential direction of the gas supply pipe 5 in a vertical line.
[0046]
The gas exhaust pipes 6 have a rod-like shape, are provided with a predetermined number in the vertical direction in a firing space 7 inside the furnace main body 1, and are installed at equal intervals near the furnace wall 10.
[0047]
The furnace body 1 is fixed to the furnace body 1 by a heat insulating material 8 at the upper part of the furnace body 1 by a bearing bearing 11, and one end of a gas exhaust pipe 6 is connected to the furnace body 1 to discharge exhaust gas to the outside of the furnace body. And a ceramic sprocket 12 is provided at the protruding portion.
[0048]
Further, the two gas exhaust pipes 6, 6 are connected by engaging a ceramic chain 14 as a connecting tool with a sprocket 12.
[0049]
One of the two gas exhaust pipes 6 is connected to the gas supply pipe 5 by a sprocket 12 via a ceramic chain 14.
[0050]
Therefore, the gas exhaust pipes 6 are rotatable in conjunction with the motor 15 and the gas supply pipe 5.
[0051]
Further, the gas exhaust pipe 6 is provided with a plurality of holes 13 in the longitudinal direction.
The holes 13 are formed by round holes 13c, are arranged in a line in the longitudinal direction, and are arranged at equal intervals along the circumferential direction of the gas exhaust pipe 6.
[0052]
Here, a firing method using a batch-type firing furnace, which is one embodiment of the heat treatment furnace of the present invention, will be described.
First, the box 9 containing the object to be fired rises while being placed on the base plate 3 above the hearth 2 having a lifting mechanism, and is placed inside the furnace body 1.
[0053]
Next, the atmosphere gas is supplied from the gas supply pipe 5 while driving the motor 15 and rotating the gas supply pipe 5, whereby the atmosphere gas is ejected from the two types of holes 13a and 13b with different radial forces. Then, the atmosphere gas is stirred in the firing space 7.
[0054]
The gas supply pipe 5 is inverter-controlled in accordance with the firing profile, and supplies an atmosphere gas necessary for firing the object to be fired into the furnace body 1.
[0055]
The object to be fired is heated and fired by radiant heat of a heater 4 fixed inside the furnace main body 1 under an atmosphere gas supplied from a gas supply pipe 5.
[0056]
Exhaust gas generated by firing the object to be fired is efficiently exhausted from the plurality of round holes 13c provided in the gas exhaust pipe 6.
[0057]
The fired object to be fired is taken out of the furnace body 1 as the furnace floor 2 descends.
[0058]
By the way, in the batch type baking furnace as in the above embodiment, the gas supply pipe 5 is installed at the center of the furnace main body 1 and the gas exhaust pipe 6 is installed near the furnace wall 10. However, for example, a structure in which a predetermined number of gas supply pipes 5 are arranged near the furnace wall 10 and a gas exhaust pipe 6 is arranged in the center of the furnace main body 1 may be used. Alternatively, a predetermined number of gas supply pipes and gas exhaust pipes may be arranged in the vicinity of the furnace wall 10, or a predetermined number of gas supply pipes and gas exhaust pipes may be arranged in the center of the furnace body 1. Good.
[0059]
Further, in the above embodiment, the gas supply pipe 5 and the motor 15 can be linked by engaging the ceramic chain 14 with the sprocket 12, but the present invention is not limited to this. For example, the loop belt can be engaged with a pulley fixed to the gas supply pipe 5 and the motor 15 so as to be interlocked.
[0060]
In the above embodiment, the motor 15 drives one gas supply pipe 5 to rotate via the ceramic chain 14. However, the present invention is not limited to this. The number of gas supply pipes 5 may be set and the arbitrary number of gas supply pipes 5 may be rotationally driven, or the predetermined number of gas exhaust pipes 6 may be installed and the arbitrary number of gas exhaust pipes 6 may be rotationally driven. Good.
[0061]
Further, in the above embodiment, the gas supply pipe 5 and the gas exhaust pipe 6 are connected. However, the present invention is not limited to this. The supply pipe 5 and the gas supply pipe 5 may be connected, a predetermined number of gas exhaust pipes 6 may be installed, and any gas exhaust pipe 6 and the gas exhaust pipe 6 may be connected. The gas supply pipe 5 and the gas exhaust pipe 6 may be installed, and any gas supply pipe 5 and any gas exhaust pipe 6 may be connected.
[0062]
Further, in the above embodiment, the gas supply pipe 5 and the motor 15 are connected, but the present invention is not limited to this, and the gas supply pipe 5 may be connected to the gas exhaust pipe 6 or a predetermined number of The motor 15 may be attached to an arbitrary number of gas supply pipes 5 of the gas supply pipes 5, or the motor 15 may be attached to an arbitrary number of gas exhaust pipes 6 of a predetermined number of gas exhaust pipes 6.
[0063]
Further, in the above embodiment, the gas supply pipe 5 is provided with the round hole 13a and the long hole 13b, and the gas exhaust pipe 6 is provided with the round hole 13c. However, the present invention is not limited to this. Instead, various hole 13 shapes are possible.
[0064]
Note that the present invention is not limited to the batch-type firing furnaces of the above-described embodiments. In various heat-treating furnaces, the heat-treated object is reliably and uniformly heat-treated by rotating a gas supply pipe. A low-cost heat treatment furnace.
[0065]
In other respects, the present invention is not limited to the above-described embodiment, and the material and the specific shape of the heat treatment furnace, the material and the specific shape of the base plate, the material of the gas supply pipe and the gas exhaust pipe, With regard to the specific shape, the material and the specific shape of the sprocket and the ceramic chain, various applications and modifications can be made within the scope of the present invention.
[0066]
【The invention's effect】
In the firing furnace of the present invention, the heat treatment of the object to be heat-treated can be performed without moving the box by rotating the gas tube by the gas tube rotation driving means. It does not happen.
[0067]
In addition, since the gas pipe can be driven to rotate by compact gas pipe rotation driving means, the rotation drive of the gas pipe requires much smaller driving torque than the case where the hearth is driven to rotate. The mechanism for rotating and driving can be made small, and the cost is low.
[0068]
Further, since the gas pipe can be disposed at any position of the furnace main body, the mounting positions of the gas supply pipe and the gas exhaust pipe are limited to the central part of the furnace main body and the vicinity of the furnace wall. It can be attached to any position without any maintenance, and maintenance is easy.
[0069]
Further, when the gas supply pipe is connected to the gas pipe rotation drive means and driven to rotate, the supply efficiency of the atmosphere gas to the object to be heat treated is improved, and the atmosphere gas can be supplied at a constant rate.
[0070]
Further, when the gas exhaust pipe is connected to the gas pipe rotation drive means and driven to rotate, the exhaust efficiency of the atmosphere gas with respect to the object to be heat treated is improved, and the atmosphere gas can be exhausted at a constant rate.
[0071]
In addition, when the gas supply pipe and the gas exhaust pipe are connected to the gas pipe rotation drive means and driven to rotate, the supply and exhaust efficiency of the atmosphere gas to the object to be fired are improved, and the flow of the atmosphere gas is smoother. become.
[0072]
Further, when the gas supply pipe and the gas exhaust pipe are linked to each other via a connector and are driven to rotate, the supply efficiency and exhaust efficiency of the atmosphere gas to the object to be fired are improved, and the flow of the atmosphere gas is reduced. Become more smooth.
[0073]
Further, when the plurality of gas supply pipes are rotationally driven in conjunction with each other via a connecting member, the supply efficiency of the atmosphere gas is further improved.
[0074]
In addition, when the plurality of gas exhaust pipes are driven to rotate in conjunction with each other via a connector, the exhaust efficiency of the atmospheric gas is further improved.
[0075]
Further, when the plurality of gas supply pipes and the plurality of gas exhaust pipes are rotated and driven in conjunction with each other via the connecting member, the supply efficiency and exhaust efficiency of the atmosphere gas are further improved.
[0076]
Further, when a plurality of holes are provided in the longitudinal direction of the gas supply pipe, the atmosphere gas can be supplied over a wide range depending on the shape of the holes, so that the supply of the atmosphere gas can be reliably performed. Efficiency is further improved. Further, it is possible to supply an atmosphere gas having a good stirring property according to the pitch of the box.
[0077]
Further, in the case where a plurality of holes are provided in the longitudinal direction of the gas exhaust pipe, the exhaust gas can be exhausted to every corner of the heat treatment space by reliable exhaustion of the atmosphere gas, and the exhaust efficiency of the atmosphere gas is further improved.
[Brief description of the drawings]
FIG. 1 is a partial sectional view showing an embodiment of the present invention.
FIG. 2 is an enlarged view of a main part of a gas supply pipe according to one embodiment of the present invention.
FIG. 3 is a partial sectional view showing a conventional batch-type firing furnace.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Furnace main body 2 Furnace floor 3 Base plate 4 Heater 5 Gas supply pipe 6 Gas exhaust pipe 7 Firing space (heat treatment space)
Reference Signs List 8 Insulation material 9 Box 10 Furnace wall 13 Hole 13a Round hole 13b Long hole 13c Round hole 15 Motor

Claims (8)

A furnace body having a heat treatment space therein, a hearth provided below the furnace body, a heater provided inside the furnace body, a gas supply pipe and a gas exhaust pipe provided in the furnace body, A heat treatment furnace comprising: a pipe rotation driving means; wherein the gas exhaust pipe is connected to the gas pipe rotation driving means, and can be driven to rotate . 2. The heat treatment furnace according to claim 1, wherein the gas supply pipe is connected to the gas pipe rotation driving means, and is rotatable. 3. 3. The heat treatment furnace according to claim 2, wherein the gas supply pipe and the gas exhaust pipe are interlocked with each other via a connector, and can be driven to rotate by the gas pipe rotation drive unit. 4. 4. The heat treatment furnace according to claim 2 , wherein the plurality of gas supply pipes are interlocked with each other via a connector, and can be driven to rotate by the gas pipe rotation drive unit. 5. The gas exhaust pipe consists of a plurality book, via a connecting member in conjunction with each other, heat treatment furnace of claims 1 to 3, wherein it can be driven to rotate by the gas pipe rotation driving means. Wherein the gas exhaust pipe and the gas supply pipe, each made of a plurality of, in conjunction through the connector, claims 2 to 5, wherein the by the gas pipe rotation driving means can be driven rotary Heat treatment furnace. The gas supply pipe, a heat treatment furnace of claims 1 to 6, wherein a plurality of holes are formed in the longitudinal direction. The gas exhaust pipe, the calcination furnace of claims 1 to 7, wherein a plurality of holes are formed in the longitudinal direction.

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