JP3142832U - Degreasing furnace - Google Patents

Abstract

[PROBLEMS] To achieve complete combustion of harmful substances contained in exhaust gas during degreasing treatment, correct harmful effects caused by incomplete combustion of harmful substances, etc., and achieve high safety and space saving of equipment. Provide a furnace.
A degreasing furnace 1 includes a degreasing furnace body that degreases a molded body including a powder raw material and a binder, and a combustion furnace 20 that burns harmful substances contained in exhaust gas from the degreasing furnace body. ing. The combustion furnace 20 includes a plurality of horizontally long combustion chambers 201 arranged in parallel on a horizontal plane, and the combustion chamber 201 communicates with the combustion chamber immediately before one end of one combustion chamber is adjacent to the other. The end portion communicates with the combustion chamber immediately after adjoining, whereby the flow path in the combustion furnace 20 is formed in a ninety-nine fold shape.
[Selection] Figure 4

Description

  The present invention relates to a degreasing furnace equipped with an exhaust combustion furnace. More specifically, the present invention relates to a degreasing furnace including a combustion furnace that burns and removes harmful substances contained in fuel and exhaust during a degreasing process of a molded body including a powder raw material and a binder.

  As a general manufacturing method for ceramic products and metal products, powder injection molding (PIM) and the like are known. The PIM method is a method of heating and kneading a ceramic or metal powder and a binder (binder) or the like, and injection molding the obtained kneaded material (compound) to obtain a molded body (so-called green body). The molded body is degreased by heating to a degreased body (so-called brown body), and then the degreased body is sintered to a sintered body (so-called silver body). Thereafter, the sintered body is processed into a product.

In the process of obtaining a degreased body by heating and degreasing the molded body, a degreasing furnace is used to decompose and remove the binder by heating the molded body. Recently, as a part of environmental measures, it is generated during the degreasing process. A degreasing furnace having a combustion furnace that burns and discharges harmful substances contained in exhaust gas by using a heat source such as a burner or a heater has been developed (for example, see Patent Document 1 or 2). Such a degreasing furnace is generally configured to include a degreasing furnace main body for heating and degreasing the molded body, and a combustion furnace for burning harmful substances in the exhaust. A heat source for treatment is provided in each of the degreasing furnace body and the combustion furnace, and harmful substances, etc. in the exhaust generated when the molded body is degreased in the degreasing furnace body are burned in the combustion furnace. It is discharged outside.
JP 11-43704 A JP 2007-1843 A

  However, the conventional degreasing furnace cannot secure a sufficient flow path of the combustion furnace due to the restriction that the combustion furnace is disposed in the degreasing furnace, and completely removes harmful substances contained in the exhaust during the degreasing process. Since it cannot be burned, there was a problem that the health of workers was harmed and environmental pollution was caused. Also, due to incomplete combustion of toxic substances, the fuel adheres to the molded body and deteriorates the quality of the product, or deposits in the interior of the combustion furnace, heat source, piping, etc., reducing the performance of the furnace itself. Therefore, there has been a demand for reduction in maintenance work such as improvement of product yield rate and removal of fuel. On the other hand, if a sufficient flow path is to be secured, it is necessary to enlarge the degreasing furnace itself, which makes it difficult to secure the installation space and increases the manufacturing cost.

  The present invention has been made in view of the above-described problems of the prior art, and its object is to achieve complete combustion of harmful substances contained in exhaust gas during degreasing and to achieve incomplete harmful substances. An object of the present invention is to provide a degreasing furnace that corrects harmful effects caused by combustion, is excellent in safety, and can realize space saving of the apparatus.

  The above object of the present invention is achieved by the following means.

  (1) That is, this invention has a degreasing furnace main body which degreases the molded object containing a powder raw material and a binder, and a combustion furnace which burns the harmful substance contained in the exhaust of the said degreasing furnace main body. The combustion furnace is a degreasing furnace comprising a flow path formed in a 99-fold shape and combustion means disposed in the flow path.

  (2) The present invention is also a degreasing furnace according to (1), wherein the combustion furnace has a plurality of combustion chambers.

  (3) In the present invention, the combustion chamber is horizontally long and formed in parallel on a horizontal plane, and the combustion chamber immediately before one end of the combustion chamber is adjacent to the combustion chamber immediately after the other end is adjacent. The degreasing furnace according to (2), wherein the flow path is formed in communication with a combustion chamber.

  (4) The present invention is the degreasing furnace according to (2) or (3), wherein a plurality of the combustion means are provided for each combustion chamber.

  (5) The present invention is the degreasing furnace according to (3) or (4), wherein the combustion means is configured to be detachable.

  (6) The present invention is also the degreasing furnace according to (5), wherein the combustion chamber has an opening communicated with the outside of the degreasing furnace, and the combustion means is attached and detached via the opening. is there.

  (7) The present invention is the degreasing furnace according to any one of (1) to (6), wherein the combustion means is a heater.

  (8) The present invention is the degreasing furnace according to (7), wherein the heater is U-shaped.

  According to the present invention, since the flow path of the combustion furnace provided in the degreasing furnace is formed in a ninety-nine fold shape, a sufficient flow path of the combustion furnace can be secured, and the exhaust gas during the degreasing process can be secured. The contained harmful substances can be burned completely. Therefore, since the exhaust gas after the combustion treatment can be rendered harmless, the health of the worker is not harmed and environmental pollution can be considered. In addition, the complete combustion of toxic substances and the like can prevent a decrease in the yield rate of the product due to adhesion of fuel such as toxic substances, and can reduce the maintenance work of the degreasing furnace. In addition, since the combustion furnace can be disposed in the degreasing furnace in the same manner as the conventional degreasing furnace while sufficiently securing the flow path of the combustion furnace, it is not necessary to enlarge the degreasing furnace itself, and the installation space is reduced. It can be ensured, and the manufacturing cost does not increase.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  1 is a schematic front view showing an overall configuration of a degreasing furnace 1 according to an embodiment of the present invention, FIG. 2 is a schematic plan view of FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA of FIG. It is. As shown in FIGS. 1 to 3, the degreasing furnace 1 includes a degreasing furnace body 10 that heats a molded body including a powder raw material and a binder to perform a degreasing process, and a harmful substance contained in the exhaust of the degreasing furnace body 10. , A control panel 30 that controls various operations of the degreasing furnace main body 10 and the combustion furnace 20, and an exhaust cooling device that cools the exhaust gas burned in the combustion furnace 20 and discharges it to the outside. 40, and the degreasing furnace body 10, the combustion furnace 20, the combustion furnace 20, and the exhaust cooling device 40 are connected by a degreasing exhaust pipe 15 and an 800 ° C. exhaust pipe 25, respectively.

  As shown in FIGS. 1 to 3, the degreasing furnace body 10 includes a door 101 for taking in and out a molded body, a degreased body, and the like, a degreasing chamber 102 for heating the molded body to perform a combustion process, and an air supply pipe 103 to the degreasing chamber 102. An air supply blower 104 for blowing air, a gas supply pipe 105 for supplying a carrier gas such as nitrogen gas, argon gas or air to the degreasing chamber 102, a fin heater 106 for heating the atmosphere of the degreasing chamber 102, and a degreasing chamber A propeller fan 107 that forcibly stirs the carrier gas in 102, a motor 108 that rotates the propeller fan 107 via a pulley (not shown), a rectifying plate 109 that adjusts the blowing direction to the molded body, and a molded body It is composed of a tray 110 and the like to be placed.

  As shown in FIGS. 4 and 5, the combustion furnace 20 includes a plurality of horizontally long combustion chambers 201 arranged in parallel on a horizontal plane. The combustion chamber 201 communicates with the combustion chamber immediately before one end of one combustion chamber is adjacent, and communicates with the combustion chamber immediately after the other end is adjacent. The road is formed in ninety-nine folds. By adopting such a configuration, for example, even in a small degreasing furnace, a sufficient flow path can be secured, and harmful substances contained in the exhaust during the degreasing process can be completely burned. A ceramic fireproof board such as a lumi board is used for the side wall of the combustion chamber 201.

  In each combustion chamber 201, at least one sheathed heater 202 is provided. As shown in FIG. 6, the sheathed heater 202 includes a U-shaped pipe 207 using a heat-resistant material such as Inconel (registered trademark), and a spiral heating element (not shown) provided inside the pipe 207. ), And an insulator (not shown) with good thermal conductivity filled in the pipe 207. However, the shape of the sheathed heater 202 is not particularly limited, and may be M-shaped or I-shaped (straight tube). The sheathed heater 202 is controlled by the control panel 30 shown in FIG. 1 so that the maximum temperature is about 800 ° C. In addition, as a combustion means in the present invention, a burner or the like may be used instead of the sheathed heater 202.

  In addition, an opening 203 is provided on the side wall of the combustion chamber 201, and the sheathed heater 202 can be attached and detached through the opening 203. The opening 203 is closed by an inner lid 204 and an outer lid 206, and a filler 205 is filled between them. With such a configuration, maintenance of the degreasing furnace 1 can be facilitated. The inner lid 204 and the outer lid 206 are made of the same material as the side wall of the combustion chamber 201, and the filler 205 is made of a ceramic wool heat insulating material such as Cahor (registered trademark).

  The control panel 30 in the present invention controls the carrier gas supply amount, the temperature adjustment of the fin heater 106 and the sheathed heater 202, the rotational speed of the propeller fan 107, etc. shown in FIGS. The control panel 30 may have a digital display controller, a programmed temperature controller, an overheat prevention device, a leakage breaker, a timer, a thermal relay, an air flow meter, a temperature recorder, an alarm signal, etc. depending on the application. Good.

  As shown in FIGS. 1 to 3 and 5, the exhaust cooling device 40 includes a sirocco fan 401 that cools exhaust gas detoxified in the degreasing furnace 1 by forcibly bringing it into contact with outside air, and an exhaust amount of the detoxified exhaust gas. A discharge amount adjusting plate 402 for adjusting the discharge amount, a discharge amount adjusting lever 403 for operating the discharge amount adjusting plate 402, and a motor 404 for rotating the sirocco fan 401.

  In the exhaust cooling device 40, the exhaust gas detoxified in the degreasing furnace 1 is brought into contact with the outside air drawn in by the sirocco fan 401, mixed and diluted, and then cooled and released to the outside. The exhaust does not impair the health of the worker and can take into account environmental pollution. Further, since the discharge amount adjusting plate 402 and the discharge amount adjusting lever 403 are provided, the exhaust amount can be adjusted according to the situation.

  Next, the usage method of the degreasing furnace 1 concerning embodiment of this invention is demonstrated.

  First, the molded body is placed on the tray 110, the door 101 is closed, and the degreasing furnace 1 is sealed. Examples of the molded body include those molded by compression molding (compact molding), extrusion molding, injection molding, and the like. Powder materials that can be used as raw materials for the molded body include ceramics such as oxide ceramics, iron Examples of the binder include polyolefins such as polyethylene, acrylic resins such as polymethyl methacrylate, styrene resins such as polystyrene, and polyvinyl chloride. Examples include various resins and various waxes.

  Next, the control panel 30 is operated to operate the degreasing furnace 1. Thereby, air and carrier gas are supplied from the supply pipe 103 and the gas supply pipe 105, respectively. Further, the propeller fan 107 rotates and the direction of the wind is adjusted by the rectifying plate 109, the air of the degreasing furnace body 10 and the carrier gas are circulated, and the exhaust gas of the degreasing furnace body 10 is sent to the combustion furnace 20. In addition, the fin heater 106 is set to be heated at 120 to 200 ° C./hour, and the atmosphere of the degreasing furnace body 10 is heated at about 600 ° C. for 2 to 3 days, so that the molded body is degreased. . The exhaust generated at this time includes toxic gases such as carbon monoxide and nitrogen monoxide generated by degreasing the binder used in the molded body, and flammable gases such as methane, ethane, and propane. ing. Exhaust gas containing toxic gas, toxic gas, etc. is heated for a long time in the ninety-nine-fold channel by each sheathed heater 202 set so that the atmosphere of the combustion furnace 20 becomes about 800 ° C., and is completely burned. The Exhaust gas rendered harmless by complete combustion is cooled by contact with outside air by the exhaust cooling device 40 and discharged to the outside.

  In addition, the degreasing furnace 1 of this invention is not limited to above-described embodiment, Of course, a various change can be added in the range which does not deviate from the summary of this invention.

  In the degreasing furnace of the present invention, since the flow path of the combustion furnace provided in the degreasing furnace is formed in a ninety-nine fold shape, a sufficient flow path of the combustion furnace can be secured, and the exhaust gas during the degreasing process Hazardous substances contained in can be burned completely. Therefore, since the exhaust gas after the combustion treatment can be rendered harmless, the health of the worker is not harmed and environmental pollution can be considered. In addition, the complete combustion of toxic substances and the like can prevent a decrease in the yield rate of the product due to adhesion of fuel such as toxic substances, and can reduce the maintenance work of the degreasing furnace. In addition, since the combustion furnace can be disposed in the degreasing furnace in the same manner as the conventional degreasing furnace while sufficiently securing the flow path of the combustion furnace, it is not necessary to enlarge the degreasing furnace itself, and the installation space is reduced. It can be ensured, and the manufacturing cost does not increase.

  Therefore, the present invention is extremely useful as a degreasing furnace for degreasing treatment of a molded body used for manufacturing ceramic products and metal products.

It is a schematic front view which shows the whole structure of the degreasing furnace 1 concerning embodiment of this invention. FIG. 2 is a schematic plan view of FIG. 1. It is AA sectional drawing of FIG. It is CC sectional drawing of FIG. It is BB sectional drawing of FIG. FIG. 2 is a schematic plan view showing an overall configuration of a sheathed heater 202.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Degreasing furnace 10 ... Degreasing furnace main body 101 ... Door 102 ... Degreasing chamber 103 ... Air supply pipe 104 ... Air supply blower 105 ... Gas supply pipe 106 ... Fin heater DESCRIPTION OF SYMBOLS 107 ... Propeller fan 108 ... Motor 109 ... Current plate 110 ... Tray 111 ... Connection terminal 15 ... Degreasing exhaust pipe 20 ... Combustion furnace 201 ... Combustion chamber 202 ... -Seeds heater 203 ... Opening 204 ... Inner cover 205 ... Filler 206 ... Outer cover 207 ... Pipe 208 ... Flange 209 ... Connection terminal 25 ... Exhaust at 800 ° C Pipe 30 ... Control panel 40 ... Exhaust cooling device 401 ... Sirocco fan 402 ... Exhaust amount adjusting plate 403 ... Exhaust amount adjusting lever 404 ... Motor

Claims (8)

A degreasing furnace body for performing a degreasing treatment on a molded body including a powder raw material and a binder;
A combustion furnace for burning harmful substances contained in the exhaust of the degreasing furnace body;
Have
The combustion furnace is
A channel formed in a ninety-nine fold shape,
Combustion means disposed in the flow path;
A degreasing furnace comprising: The combustion furnace has a plurality of combustion chambers,
The degreasing furnace according to claim 1. The combustion chamber is horizontally long and formed in parallel on a horizontal plane,
The flow path is formed by communicating with the combustion chamber immediately before one end of the combustion chamber is adjacent to the combustion chamber immediately after the other end is adjacent, respectively.
The degreasing furnace according to claim 2. A plurality of the combustion means are provided for each combustion chamber,
The degreasing furnace according to claim 2 or 3. The combustion means is configured to be detachable,
The degreasing furnace according to claim 3 or 4. The combustion chamber has an opening communicating with the outside of the degreasing furnace,
The combustion means is attached and detached through the opening.
The degreasing furnace according to claim 5. The combustion means is a heater;
The degreasing furnace of any one of Claims 1-6. The heater is U-shaped,
The degreasing furnace according to claim 7.

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