JP2003340545A - Method and equipment for pretreating self-hardening molding sand for regeneration - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method which can treat recovered sand containing self- hardening molding sand debris to bring the sand to a suitable state for regeneration treatment. <P>SOLUTION: This method for pretreating self-hardening molding sand for regeneration includes the steps of: grinding the recovered sand containing self- hardening molding sand debris into small lumps; removing iron pieces from the ground recovered sand; separating the recovered sand with the iron pieces removed therefrom into self-hardening molding sand and lump-shaped self- hardening molding sand debris; further grinding the separated lump-shaped self-hardening molding sand debris into single-particle self-hardening molding sand; and supplying the ground self-hardening molding sand and single-particle self-hardening molding sand into a regeneration apparatus. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of pretreating self-hardening foundry sand and its equipment, and more particularly to a method of disassembling and recovering a self-hardening mold after pouring before regenerating it. The present invention relates to a method for treating recovered sand and its equipment.

[0002]

2. Description of the Related Art Conventionally, most of the self-hardening molding sand debris generated when pouring a mold made of self-hardening molding sand after pouring has been discarded. Therefore, in recent years, there is a movement to recover and recycle self-hardening molding sand debris to recycle waste, and to reuse it as line sand or core sand. It is the present situation that a suitable and sufficient one for recycling treatment has not yet been developed.

The present invention has been made in view of the above circumstances, and an object thereof is a method of reclaiming recovered sand containing self-hardening foundry sands to a suitable state before reclaiming. And to provide its equipment.

[0004]

In order to achieve the above-mentioned object, the method for pre-regeneration of self-hardening molding sand according to claim 1 is to separate and recover the self-hardening mold after pouring.
A method of treating the recovered sand before the reclaiming process, a step of crushing the recovered sand containing self-hardening foundry sand to make the self-hardening foundry sand into a small lump, and from this crushed recovered sand A step of removing the iron pieces, a step of separating the recovered sand from which the iron pieces have been removed into self-hardening foundry sand and massive self-hardening foundry sand, and further separating the separated massive self-hardening foundry sand by crushing into single-particle The method is characterized by including a step of making hard foundry sand and a step of feeding the crushed self-hardening foundry sand and single-particle self-hardening foundry sand to a reclaiming device.

In the present invention, the crushing of the lump self-hardening foundry sand into single-particle self-hardening foundry sand is preferably carried out by a plurality of ceramic spherical bodies vibrating in a vibrating grinding tank.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a self-hardening molding sand pretreatment facility to which the present invention is applied will be described below in detail with reference to the drawings. As shown in FIG. 1, the present equipment is, as shown in FIG. 1, a primary pulverizer 1 for crushing the recovered sand containing self-hardening foundry sand to make the self-hardening foundry sand into small lumps, and the crushed recovered sand. Sieve device 2 as a separating device for separating self-hardening foundry sand and massive self-hardening foundry sand debris, and a magnetic separator 6 as an iron piece removing device for removing iron pieces from crushed recovered sand
And a secondary crushing device 3 for further crushing the separated lump self-hardening molding sand debris into single-particle self-hardening molding sand, and a reclaiming device for the crushed self-hardening molding sand and single-particle self-hardening molding sand A belt conveyor 4 as a transfer device for feeding to
It is composed of.

Then, the primary crushing device 1 has the sieve device 2 through the bucket conveyor 5 and the magnetic separator 6.
Connected to. The primary crushing device 1 has a width of 4 m.
It is a general-purpose crushing device having a bottom having a slit of m. In addition, as shown in FIGS. 2 and 3, the secondary crushing device 3 has a cylindrical crushing tank 9 which is elastically supported by a plurality of coil springs 7 and installed on the machine base 8, A vibrator 11 mounted on the lower surface of the crushing tank 9 via a bracket 10, and a ceramic spherical body (not shown) capable of being crushed in the crushing tank 9 to crush the massive self-hardening casting sand debris by applying vibration. No)), and is composed of.

The bottom of the crushing tank 9 has a triple structure, and a wire mesh 12 having a mesh size of 2.0 mm or less through which the single-particle self-hardening molding sand can pass is stretched horizontally at the top. Further, a bottom plate main body 13 that is inclined downward to the right is attached to the middle position. Further, the impurity discharging chute 1 is provided above the wire net 12 on the body wall of the crushing tank 9.
4 and a chute 15 for discharging single-particle self-hardening molding sand is provided above the bottom plate body 13, and the single-particle self-hardening molding sand is discharged from the single-particle self-hardening molding sand chute 15 It is supposed to be discharged. Also, FIG.
As shown in FIG. 3, a hopper 16 for temporarily storing the self-hardening molding sand is disposed directly below the sieving device 2. The ceramic spherical body had a diameter of about 30 mm,
Up to 100 pieces (a quantity that fits within one layer in the crushing tank 9) are charged.

The thus constructed device is self-hardening after pouring under the condition that the oscillating machine 11 of the secondary crushing device 3 is driven to apply vibration to the crushing tank 9 and the ceramic spherical body. The recovered sand containing the self-hardening molding sand debris obtained by separating the mold and collecting it is put into the primary crushing device 1 and crushed to make the self-hardening molding sand debris into small lumps. After being sent to the magnetic separator 6 via the bucket conveyor 5 to remove metal impurities such as chilled wire and wire contained in the recovered sand, the recovered sand is put into the sieving device 2 to collect the recovered sand into the self-hardening molding sand and the lump-shaped automatic sand. Separated into hard foundry sand. The self-hardening foundry sand separated in this way is temporarily stored in the hopper 16, while the lump self-hardening foundry sand is thrown into the secondary crushing device 3 to collide with the crushing tank 9 and the ceramic spheres and the ceramic spheres. The particles are further crushed by collision with each other, and the lump self-hardening foundry sand is made into single-particle self-hardening foundry sand. afterwards,
The self-hardening foundry sand and the single-particle self-hardening foundry sand in the hopper 16 are sent to a regenerator (not shown) by the belt conveyor 4. The small iron pieces mixed in the massive self-hardening foundry sand are discharged from the impurity discharging chute 14 together with the uncrushed self-hardening foundry sand.

As shown in FIG. 4, a chute 14 for discharging impurities and a chute 15 for discharging single-particle self-hardening molding sand are used.
May be provided on the same side. Furthermore, when the amount of iron pieces mixed in the recovered sand is small, the iron pieces in the recovered sand may be periodically manually removed, and the impurity discharging chute 14 may be omitted.

[0011]

As is apparent from the above description, the present invention is a method of treating the recovered sand before reclaiming when separating and recovering the self-hardening mold after pouring. A step of crushing the recovered sand containing foundry sand to make the self-hardening foundry sand into a small lump, a step of removing iron pieces from the crushed recovered sand, and a recovered sand from which the iron pieces have been removed are self-hardening. A step of separating the molding sand and the lump self-hardening molding sand rag, a step of further crushing the separated lump self-hardening molding sand slag into a single-particle self-hardening molding sand, and the crushed self-hardening molding sand and singular Since it includes a step of feeding the particulate self-hardening foundry sand to the reclaiming device, in reclaiming the recovered sand containing the self-hardening foundry sand, it has an excellent practical effect such as being able to be in an extremely suitable state. Play.

[Brief description of drawings]

FIG. 1 is a schematic front view showing an embodiment of the present invention.

FIG. 2 is an enlarged detailed view of a portion A of FIG.

FIG. 3 is a plan view of FIG. 2.

FIG. 4 is a drawing of an apparatus showing another embodiment of the apparatus shown in FIG. 2, in which a is a plan view and b is a front view.

[Explanation of symbols]

1 primary crusher 2 Sieve device 3 Secondary crusher 4 belt conveyor 6 magnetic separator

Claims (6)

[Claims] 1. A method for treating recovered sand before reclaiming, which comprises recovering and recovering the self-hardening mold after pouring, in which the recovered sand containing self-hardening foundry sand is crushed. A step of making the self-hardening foundry sand small lumps, a step of removing iron pieces from the crushed recovered sand, and separating the recovered sand from which the iron pieces have been removed into self-hardening foundry sand and massive self-hardening foundry sand And a step of further crushing the separated lump self-hardening foundry sand to a single-particle self-hardening foundry sand, and feeding the crushed self-hardening foundry sand and single-particle self-hardening foundry sand to a regenerator And a method for pre-treatment for regeneration of self-hardening foundry sand. 2. The method for pre-regeneration of self-hardening foundry sand according to claim 1, wherein the crushing of the lump self-hardening foundry sand into single-particle self-hardening foundry sand vibrates in a vibrating grinding tank. The method for pre-regeneration of self-hardening foundry sand, characterized in that the method is performed by using the ceramic spherical body of. 3. A facility for treating recovered sand before pouring and recovering the recovered self-hardening mold after pouring, and crushing the recovered sand containing self-hardening foundry sand. Primary crushing device for making the self-hardening foundry sands into small lumps, a separating device for separating the crushed recovered sands into self-hardening foundry sands and lumped self-hardening foundry sands, and iron pieces from the crushed recovered sands For removing iron pieces, a secondary crushing device for further crushing the separated massive self-hardening foundry sand to obtain single-particle self-hardening foundry sand, the crushed self-hardening foundry sand and single-particle self-hardening sand A recycling pretreatment facility for self-hardening molding sand, comprising a conveying device for feeding the molding sand to the recycling device. 4. The regeneration pretreatment facility for self-hardening molding sand according to claim 3, wherein the secondary crushing device is provided with a bottom portion that is elastically supported and through which the single-particle self-hardening molding sand can pass. A crushing tank capable of loading self-hardening foundry sand, a vibrator for vibrating this crushing tank, and a ceramic spherical body which is loaded in the crushing tank and can crush massive self-hardening foundry sand by applying vibration. And a pretreatment facility for recycling self-hardening foundry sand. 5. The regeneration pretreatment facility for self-hardening foundry sand according to claim 4, wherein the size of the mesh at the bottom of the crushing tank is 2.0 mm or less. Pretreatment equipment. 6. The self-hardening foundry sand pretreatment facility according to claim 4, wherein the ceramic spherical body has a diameter of 2
Pre-regeneration equipment for self-hardening foundry sand, characterized in that it is 0 to 60 mm.