JP7011112B2 - Abrasive regeneration method and its equipment - Google Patents

Description

The present invention relates to a method for regenerating an abrasive material and an apparatus thereof, and in particular, a material removed from the abrasive material and a work (workpiece) generated after shot blasting (iron scrap such as rust, waste plastic such as paint residue, etc.). The present invention relates to a method for regenerating an abrasive for separating and recovering a reusable abrasive from a mixture consisting of the above, and an apparatus thereof.

Conventionally, shot blasting has been widely used for deburring work, surface grinding, patterning such as satin finish, and the like.
This shot blasting process is a method of processing a work by colliding a granular abrasive with the work.
In the shot blasting process, the optimum type of abrasive (particle size, composition, density, hardness, strength), projection speed, projection angle, projection amount, etc. is selected according to the hardness of the work and the processing conditions. ..
The types of abrasives are generally metal-based (iron-based, stainless steel-based, amorphous, etc.), ceramic-based (alumina, silicon carbide, etc.), resin-based (nylon, polyca, etc.), and plant-based (walnut, wood chips). , Glass-based (beads, powder), dry ice and other various materials are used.

By the way, the entire amount of the mixture consisting of the abrasive and the waste removed from the work generated after the shot blasting treatment is usually treated as waste, and the following problems have been pointed out.
1. 1. Although the abrasive material has not deteriorated in performance, the entire amount must be discarded due to the contamination of the removed material.
2. 2. Abrasives will be discarded together with the removed material, which will increase the disposal cost.
3. 3. Running costs increase because the abrasive cannot be reused.
4.1. Therefore, the amount of waste increases.

In order to deal with this problem, various techniques for separating and recovering reusable abrasives from the mixture generated after shot blasting and reusing them have been proposed and put into practical use (for example, patent documents). See 1-2.).

Japanese Unexamined Patent Publication No. 2001-21276 Japanese Patent Application Laid-Open No. 2003-305650

By the way, various techniques for separating and recovering reusable abrasives from the mixture generated after the conventional shot blasting treatment and reusing them are basically such that sieving and specific gravity sorting are appropriately combined. However, there is a problem that it is difficult to perform flexible processing according to the properties of the mixture generated after shot blasting, and for this reason, the recovery rate of the abrasive cannot be increased as expected. rice field.

In view of the problems associated with the mixture generated after the conventional shot blasting treatment, the present invention can increase the recovery rate of the abrasive by performing the treatment according to the properties of the mixture generated after the shot blasting treatment. It is an object of the present invention to provide a method for regenerating a material and an apparatus thereof.

In order to achieve the above object, the method for regenerating the abrasive of the present invention is a method for regenerating the abrasive contained in a mixture of the abrasive generated after the shot blasting and the material removed from the work, and is used for sieving and specific gravity sorting. When the water content of the mixture exceeds a predetermined threshold before separating the reusable abrasive from the mixture, the mixture is dried to reduce the water content of the mixture below the threshold. It is characterized by performing screening and specific gravity sorting.

In this case, rough sieving can be performed before the mixture is dried.

Further, in order to achieve the above object, the abrasive regenerating device of the present invention is a grinding material regenerating device contained in a mixture consisting of the abrasive generated after the shot blast treatment and the material removed from the work, from the mixture. A sieving means and a specific gravity sorting means for separating the reusable abrasive are provided, and the mixture is dried when the water content of the mixture exceeds a predetermined threshold in the preceding stage of the sieving means and the specific gravity sorting means. It is characterized by being provided with a drying means that makes the water content of the mixture equal to or less than the threshold value by the treatment and supplies the mixture to the sieving means and the specific gravity sorting means.

In this case, a sieving means for performing coarse sieving can be provided in front of the drying means.

According to the method for regenerating an abrasive material and the apparatus thereof of the present invention, the recovery rate of the abrasive material can be increased by performing the treatment according to the properties of the mixture generated after the shot blasting treatment, particularly the water content of the mixture. ..

It is a flow figure which shows an example of the method of regenerating the abrasive of this invention. It is a top view which shows an Example of the recycle device of the abrasive of this invention. It is a front view of the reclaiming apparatus (previous stage) of the abrasive of this invention. It is a side view (A arrow view of FIG. 3) of the regenerator of an abrasive of this invention. It is a front view of the reclaiming apparatus (separation process) of the abrasive of this invention. It is explanatory drawing of the sieving means of the reclaiming apparatus of the abrasive of this invention. It is explanatory drawing of the specific gravity sorting means of the reclaiming apparatus of the abrasive of this invention.

Hereinafter, a method for regenerating the abrasive of the present invention and an embodiment of the apparatus thereof will be described with reference to the drawings.

1 to 7 show an embodiment of the method for regenerating the abrasive of the present invention and the apparatus thereof.

This method for regenerating the abrasive is intended to increase the recovery rate of the abrasive by performing a treatment according to the properties of the mixture generated after the shot blasting treatment, particularly the water content of the mixture. After rough sieving the mixture consisting of the abrasive generated after the shot blasting and the material removed from the work, when the water content of the mixture exceeds a predetermined threshold, the mixture is dried. By doing so, the water content of the mixture is lowered to the threshold value or less, and then the reusable abrasive is separated from the mixture by performing sieving and specific gravity sorting.

Then, the grinding material recycling device for carrying out this grinding material regeneration method includes a receiving hopper 1 into which a mixture consisting of the grinding material generated after the shot blast process and the material removed from the work is charged, and the coarse mixture. A swirling sieve 2 as a sieving means for sieving, and a drying means for drying the mixture so that the water content of the mixture is equal to or less than the threshold when the water content of the mixture exceeds a predetermined threshold. A drying furnace 3 as a sieving furnace 3, a vibrating sieve 4 as a sieving means for sieving a mixture whose water content is equal to or less than a threshold value, and a windshield sorting machine 5 as a specific gravity sorting means for performing specific gravity sorting. Is connected by a conveyor device 11 to 16 or a storage hopper 17 so that the reusable grinding material can be separated from the mixture by continuously processing the mixture.

In this case, the swirling sieve 2 as a sieving means for coarsely sieving the mixture performs coarse sieving while crushing the mixture received from the receiving hopper 1, and the lumps separated here (for example,). , 30 mm or more) is treated as mixed waste.
This makes it possible to reduce the load on each device in the subsequent process.

As the drying oven 3 as a drying means for drying the mixture, various drying ovens can be used, but in this embodiment, a rotary kiln is used.
The drying furnace 3 is connected to the drying cyclone 31, the bag filter 32, and the blower 33 to prevent the generated dust from leaking to the outside.
In this case, for example, the conveyor devices 13 and 14 connected to the drying furnace 3 are covered with a dustproof cover to form a shielding structure, and the air inside is sucked through the drying furnace 3 so that the generated dust does not leak to the outside. Can be.
Further, the drying oven 3 is provided with a burner that uses a liquid fuel such as heavy oil supplied from the fuel tank 34.

The drying furnace 3 keeps the water content of the mixture below the threshold value. Therefore, a water content measuring means (not shown) for measuring the water content of the mixture at an appropriate place in the introduction part or the discharge part of the drying furnace 3 is omitted. ) Can be arranged to automatically control the operating state of the drying furnace 3.

The threshold value of the water content of the mixture can be appropriately set depending on the material of the mixture and the like, but it is usually set to about 10% WB or less, preferably 5% WB or less, and 3% WB or less. ..

The vibrating sieve 4 as a sieving means for sieving a mixture having a water content of 3 mm or less is, for example, by sieving the mixture into three different particle sizes, for example, iron scraps of 3 mm or more and waste plastic. Etc. are used as mixed waste, fine particles of 1 mm or less are separated (cascade recycled) as a forming inhibitor (RPF) for steelmaking (about 40 to 50%), and the remaining mixture of 1 to 3 mm is sorted by specific gravity. It will be introduced into the windshield sorter 5 as the specific gravity sorting means to be performed.

The wind power sorter 5 as a specific gravity sorting means for performing specific gravity sorting separates lightweight iron scraps, waste plastics, etc. as mixed waste, and the remaining heavy materials are recycled abrasives (recycled crushed stone) (about 30 to 40%). ) And use it for reuse.

According to this method for recycling the abrasive and its device, the recovery rate of the abrasive is increased by performing the treatment according to the properties of the mixture generated after the shot blasting treatment, particularly the water content of the mixture, and the recycled abrasive (recycled abrasive) ( It can be reused as recycled crushed stone), and the collected fine particles can be used as a forming inhibitor (RPF) for steelmaking (cascade recycling), greatly reducing the amount of waste discharged. Can be done.

The method for regenerating the abrasive of the present invention and the apparatus thereof have been described above based on the examples thereof, but the present invention is not limited to the configuration described in the above examples and is not deviated from the purpose thereof. The configuration can be changed as appropriate.

Since the method for regenerating the abrasive and the apparatus thereof of the present invention can increase the recovery rate of the abrasive by performing the treatment according to the properties of the mixture generated after the shot blasting treatment, various types used for the shot blasting treatment. It can be suitably used for the purpose of recycling abrasive materials.

1 Receiving hopper 2 Swirling sieve 3 Drying furnace 31 Drying cyclone 32 Bug filter 33 Blower 34 Fuel tank 4 Vibration sieve 5 Wind sorting machine 11-16 Conveyor device 17 Storage hopper

Claims (4)

In a method for regenerating a grinding material contained in a mixture consisting of a grinding material generated after a shot blast treatment and a substance removed from the work, the mixture is sieved into three types of particle sizes to start from a work having a large particle size from the mixture. The light weight is separated from the intermediate particle size mixture by performing specific gravity sorting with a wind sorter , and the heavy material is used as a reusable grinding material. When the water content of the mixture exceeds a predetermined threshold in the stage before separation, the mixture is dried to reduce the water content of the mixture to the threshold or less, and the sieving and specific gravity sorting are sequentially performed . How to regenerate the grinding material. The method for regenerating an abrasive according to claim 1 , wherein a lump is separated from the mixture by performing rough sieving before the mixture is dried. In a regenerator of an abrasive contained in a mixture consisting of an abrasive generated after a shot blast process and a substance removed from the work, the mixture is sieved into three types of particles to remove the material from the work having a large particle size. A specific gravity sorting means consisting of a sieving means for separating fine particles having a small particle size and a mixture having an intermediate particle size, and a wind sorter for separating the mixture having the intermediate particle size into a lightweight material and a reusable abrasive for heavy materials. When the water content of the mixture exceeds a predetermined threshold value, the mixture is dried to reduce the water content of the mixture to the threshold value or less and sieved in front of the sieving means and the specific gravity sorting means. A regenerating device for an abrasive , characterized in that it is provided with a drying means for supplying the means and the specific gravity sorting means. The regenerating apparatus for an abrasive according to claim 3, further comprising a sieving means for separating agglomerates from the mixture by performing coarse sieving in front of the drying means.

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