JPH07328741A - Reconditioning equipment for organic sand - Google Patents

Abstract

PURPOSE:To prevent the stay and the heating of the reconditioned sand by successively heating the organic sand thrown from an organic sand charging port at the upper part from the surface by the flame of a heating means provided on the lower side part of a refractory container for burning to allow the organic matter to be successively burned and collapsed from the surface and allow the reconditioned sand to be successively fallen. CONSTITUTION:A refractory container l for burning is provided with a heating means 2, an exhaust port 3, an organic sand charging port 4, and a refractory grate port 5 to select and discharge the reconditioned sand. The refractory container 1 for burning is the refractory and heat resistant structure where a refractory material 8 is lined on the inner side of a metallic container 9. The heating and burning means 2 includes a gas burner, a kerosine or the like. The refractory grate port 5 controls the space of the lattice to the prescribed value, selects the reconditioned sand which is successively fallen after being burned, and discharge the fine-grained sand granules 14 of excellent quality into a collecting container 13 arranged below a base 12 without being clogged. This constitution reconditions the homogeneous sand of excellent quality which is capable of being re-used as the casting sand.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple apparatus having a structure for regenerating, from a lump obtained by crushing or crushing an organic self-hardening foundry sand mold, free-flowing good quality sand for sand mold production.

[0002]

2. Description of the Related Art Generally, as a sand mold for casting, a sand mold formed by using a sand mold coated with a clay substance and a sand covered with an organic substance such as phenol resin is used. In the process of manufacturing a casting, a large amount of sand or agglomerates (in this specification, referred to as organic sand) generated by manufacturing the casting using this casting sand mold and then demolding and crushing or crushing. Therefore, in order to regenerate such lumps of organic sand,
Conventionally, various methods or devices have been proposed. For example, in Japanese Unexamined Patent Publication No. 59-30994, a duct that leads to a powder recovery device is provided in the ceiling, a raw material inlet and a hot air inlet are provided directly below the tower, and the bottom is opposite to each other. There is disclosed a device in which two rotary impellers that rotate in a direction are arranged, and the raw material is sprayed from the inlet to the two rotary impellers and crushed into small lumps by the two rotary impellers. Further, Japanese Patent Application Laid-Open No. 5-318021 discloses a method of crushing a lump obtained by decomposing a sand mold for casting, further mechanically scrubbing it to remove an adhesive, and recovering a reclaimed molding sand. Further, in JP-A-53-19535, after sizing the used sand for molds coated with resin or clay, the clay is converted into a brittle substance and the temperature at which dolomite lime is converted into an oxide. A method is disclosed in which the sand particles are fired and subjected to vigorous agitation to rupture or split a coating of inert brittle material for cleaning. Alternatively, a method of peeling the coating material on the surface of the sand particles through a large kiln such as a fluidized-bed roasting furnace is also known.

[0003]

However, the above-mentioned conventionally known method or apparatus for regenerating organic sand requires extremely complicated steps and long processing time, or is a particularly complicated and large-scale apparatus. Although it is good for treating a large amount of organic sand, it is not suitable for treating various kinds of organic sand little by little, it is difficult to obtain recycled sand of good quality, and maintenance of the equipment is not easy.

It is an object of the present invention to provide a device which is capable of treating various kinds of organic sand little by little, and which has a simple structure and is easy to maintain and manage to regenerate free flowing good quality sand for sand mold production. And

[0005]

In order to achieve the above object, an organic sand reclamation apparatus of the present invention selects and discharges an exhaust port at a ceiling part, an organic sand charging port at an upper part, and a recycled sand at a bottom part. What is claimed is: 1. An apparatus for regenerating organic sand, comprising a combustion refractory container having a refractory grate opening, and one or more heating and combustion means, wherein the heating and combustion means is provided on a lower side of the combustion refractory container. Characterize.

The organic sand reclaiming device of the present invention is the above-mentioned organic sand reclaiming device, in which a post-heating combustion means and / or a linear body capable of red heat is provided in the upper part of the combustion refractory container and near the exhaust port. It is further provided.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an organic sand reclamation apparatus according to an embodiment of the present invention.

An organic sand recycling apparatus according to one embodiment of the present invention is
The combustion refractory container 1 is provided with a heating and combustion means 2, an exhaust port 3, an organic sand input port 4, and a refractory grate port 5 for selecting and discharging reclaimed sand. The combustion refractory container 1 has a refractory / heat resistant structure in which a refractory material 8 is lined inside a metal container 9. It is preferable to make the refractory container 1 cylindrical because it is possible to prevent the phenomenon of hanging up a mass of organic sand. The heating / combustion means 2 is, for example, a gas burner or a kerosene burner, and is preferably 1 (group) or more in the lower part and the side part (lower part) of the refractory container 1, and preferably 2 (group) or 3 for uniform heating.
(Group) is provided. For example, in the case of a gas burner, for example, the refractory container 1 is provided with a heating port 7 which penetrates the lower part of the refractory container 1 and the refractory material 8 at an inclination of a predetermined angle from the horizontal plane. The middle temperature is 410-1
The time until it passes through the refractory grate and falls so that it can be burned sequentially by inserting it so that the flame can be radiated slightly downward toward the inside of the refractory container so that it is around 170 ° C It takes about 25 to 75 minutes.
The exhaust port 3 is provided in the ceiling of the fireproof container 1, and it is preferable to install the chimney 10. It is preferable that the ceiling portion is formed in a hood shape and the exhaust port 3 is provided. The organic sand input port 4 is
It is preferably provided on the upper part (including the ceiling part) of the fireproof container 1 so as to easily drop the organic sand, and is preferably provided with a door with a handle for easy opening and closing. Fireproof grille 5
Is provided at the bottom of the refractory container 1, and by controlling the gap of the lattice within the range of, for example, 3 to 14 mm, the reclaimed sand that falls after being sequentially burned is selected, and it has a smooth and good quality. The sand grains 14 are discharged into the collection container 13 arranged below the base 12 without clogging.

In another embodiment of the organic sand reclamation apparatus of the present invention, a refractory grate for selecting and discharging heating and combustion means 2, an exhaust port 3, an organic sand charging port 4 and recycled sand in a combustion refractory container 1. Mouth 5
And a post-heating combustion means 2'and / or a line body 6 capable of glowing red. After this, the heating and combustion means 2'is
The gas (unburned gas) generated by the burning of the organic matter coated on (the lump of) the organic sand 11 is completely burned by the heating and burning means 2 provided on the lower side of the refractory container 1, and smoke and In order to prevent the discharge of odor, it is provided in the upper part of the fireproof container 1 and in the vicinity of the exhaust port 3 (when the ceiling part is in the shape of a hood, it is preferable to provide it in the hood). The post-heating combustion means 2'is also, for example, a gas burner, a kerosene burner, or an electric heating heater, and is inserted and mounted in a post-heating port 7'provided through the wall of the hood or the refractory container 1 at its upper portion. . Specifically, the linear body 6 is, for example, an iron wire, a nichrome wire, or the like, which can be easily red-heated by heat from the inside of the refractory container 1, heating by a post-heating combustion means 2 ′ such as a burner, or electricity. It is provided in the upper part of the refractory container 1 and in the vicinity of the exhaust port 3 (it is preferable to be provided in the hood when the ceiling part has a hood shape). When heating directly with a burner or the like, it is preferably provided at a position where it comes into contact with the flame of the burner.

[0010]

The function and effect of the present invention are as follows:
By the one or more heating and combustion means provided on the lower side of the combustion refractory container, the organic sand (the lump) charged from the organic sand charging port on the upper part of the refractory container is sequentially heated to the flame, Organic substances such as phenolic resin coated on the sand are sequentially burnt and destroyed from the surface of the sand, and the reclaimed sand is gradually dropped to prevent residence heating. Further, since a refractory grate opening is provided in the lower part of the refractory container, the size of the particles of the reclaimed sand falling down is selected and made constant by controlling the gap of the grate. It can be discharged to a collection container of recycled sand arranged below. Therefore, it is possible to regenerate uniform and good quality sand that can be reused as foundry sand. Further, since the device of the present invention has an extremely simple structure and the container and the discharge grate port are heat-resistant and fire-resistant, the operation and maintenance thereof do not require special and complicated and difficult work and equipment. Not only that, it has a long life. As described above, since the structure is suitable as a small-sized device, various kinds of organic sand can be treated little by little.

The apparatus for regenerating organic sand according to the present invention, in which the post-heating combustion means and / or the linear body capable of red heating is provided in the upper part of the combustion refractory container and near the exhaust port, is provided in the lower part of the combustion refractory container. By the provided heating and combustion means, the gas (unburned gas) generated by the combustion of the organic matter coated on the organic sand is completely burned by the post-heating combustion means and / or the red heatable linear body. The emission of smoke and odor can be completely prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an organic sand reclamation apparatus according to an embodiment of the present invention.

[Explanation of symbols]

 1 Refractory container for combustion 2 Heating and burning means 2'Post-heating and burning means 3 Exhaust port 4 Organic sand input port 5 Refractory grate port for sorting and discharging reclaimed sand 6 Red-heated linear body

Claims (2)

[Claims] 1. A combustion refractory container having an exhaust port on the ceiling, an organic sand charging port on the top, and a refractory grate port for selecting and discharging recycled sand on the bottom, and one or more heating and burning means. An apparatus for regenerating organic sand, wherein the heating and burning means is provided on a lower side of a combustion refractory container. 2. The apparatus for regenerating organic sand according to claim 1, further comprising a post-heating combustion means and / or a linear body capable of red heat, which is provided in the upper part of the combustion refractory container and near the exhaust port.