KR20030037073A - method for recovery of waste molding sand & apparatus therefor - Google Patents

Abstract

PURPOSE: A method for regenerating waste molding sand and an apparatus therefor are provided to regenerate waste molding sand at low cost by reducing size of process facility and continuously arranging a series of working means so that a small amount of waste mold sand is repeatedly regenerated for mass-production in a small space. CONSTITUTION: The apparatus comprises a vibrating knock out machine (15) for separating waste molding sand from a cast article of molding flask by knocking out the molding flask; a transfer unit (16) for transferring waste molding sand discharged from the vibrating knock out machine (15); a crushing machine (17) arranged at the side of the transfer unit (16) to crush waste molding sand; a vibrating screen (18) for filtering waste molding sand discharged from the crushing machine (17); a hopper (19) located in rear of the vibrating screen (18) to inject raw materials including binder; a water sprayer (20) positioned in rear of the hopper (19) to spray water onto waste molding sand; a body of revolution (21) for kneading a mixture of water and waste molding sand; a support (22) for moving a kneaded material to the lower side; a cooling unit (23) for cooling the kneaded material; and a storage tank (25) for storing regenerated molding sand through a hopper (24), wherein the transfer unit (16) is formed of a belt conveyor or a screw installed inside cylindrical body, and wherein the cooling unit (23) is a unit for blowing cooling air to the kneaded material.

Description

Method for recovery of waste molding sand and apparatus therefor {method for recovery of waste molding sand & apparatus therefor}

The present invention relates to the recycling of waste foundry sand, and more particularly, to continuously process a series of processes such as transporting, pulverizing, administering a binder, controlling humidity, cooling, sieving, and storing waste foundry sand, and using it in the treatment process. The present invention relates to a method for regenerating waste foundry sand in which a large amount of sulfuric acid is produced by repeatedly regenerating a large amount of foundry sand as a small amount of foundry sand by reducing and minimizing a process facility by installing a small space.

In general, foundry sand contains various compound binders in the casting sand to make a mold conforming to the shape of the product to be cast, and then discards the waste foundry sand obtained by casting and separating from the molded product. Although it has been a cause of loss and environmental pollution, a method for recycling it has been proposed.

In the prior art, for example, in Korean Patent Laid-Open Publication No. 1998-035741, in Fig. 1, the waste casting sand obtained from the mold for which the mold work is completed is placed in the water container 3 through the hopper 1 and the belt conveyor 2, Stir together to remove the water-soluble adhesive on the molding sand, and transfer the washed casting sand to the drying unit 12 through a transfer device (9) equipped with a transfer screw 10 to dry and recycle, but in the means Since it consists only of an intermittent process of washing and drying, waste casting sand having a uniform particle size cannot be obtained, and raw material mixing means such as new caking additives are not shown. Thus, such a series of continuous means and apparatus are separately required.

On the other hand, in the Korean Utility Model Publication No. 2000-0000024, a vibrating body (1) provided in a vibrating body rocking device (2) which can be separated in four stages for recycling shell molding sand of a casting factory. Pass only the waste foundry sand that can be recycled using. A plurality of foundry sand crushing feathers 6-1 to 6-8 are provided in the body 5, and are provided in the inlet 4 made of a facility having a sieve 8 and a discharge box 7 at the bottom thereof. The waste foundry sand passed through the vibrating body 1 is inputted, and the injected waste foundry sand is crushed while adhering to the shredding feathers 6-1 to 6-8 in the body, and the crushed waste foundry sand is discharged through the 60 mesh sieve 8 It is contained in the box (7).

However, such a device has no means for mixing new caking additives in the waste casting sand, and no humidity control means and no kneading means appear. Thus, such a series of continuous means and apparatus are separately required.

As described above, the conventional apparatuses have no intervening means for incorporating new caking additives into the waste casting sand, and a series of apparatuses such as no humidity control means and no kneading means appear at all. Therefore, for such means, there are problems such as securing a large working space and facility investment separately.

The present invention has been made in order to improve the above-mentioned conventional problems, a small amount of the conventional molding sand required according to a series of continuous working means to reduce and downsize the process equipment to enable the regeneration treatment of foundry sand even in a narrow space Its purpose is to obtain waste foundry sand with cheap production cost, such that it is possible to mass-produce by repeated reproduction even through the production of foundry sand.

1 is a plan view showing a conventional recycling apparatus for waste casting sand

2 is a regeneration device of the waste casting sand according to the present invention

Explanation of symbols for main parts of the drawings

15: vibratory trimmer 16: transfer device

17: shredder 18: vibrating body

19: Hopper 20: water spray

21: rotating kneading body 22: pedestal

23: cooling device

The present invention for achieving the above object is a first step of removing and separating the waste molding sand from the product of the mold, the second step of transporting and crushing the debrised waste molding sand to a crusher, the third step of sieving the crushed waste molding sand, A fourth step of dropping a binder into the waste foundry sand that has passed through a sieve, a fifth step of controlling humidity by spraying water on the mixture, a sixth step of kneading the foundry sand mixture conveyed through the means, followed by cooling It consists of a step of storing.

In the transportation means for moving the waste casting sand to the crusher in the second step, all other transportation means, such as movement by a screw provided in the cylindrical body, movement by a belt conveyor, are applicable.

In addition, as the apparatus of the present invention for the process of the above step, as shown in Fig. 2 showing an embodiment, a conveying device 16, such as a belt conveyor located on the side of the vibrating decanter 15, a crusher provided on the side of the conveying device 16 (17), a hopper (19) that is located on the bottom of the crusher (17), a hopper (19) containing a binder and the like located in the rear end of the vibrator (18), located in the rear end of the hopper 19 Water spraying device 20, rotary kneading body 21 is formed in connection with the spraying device 20, pedestal 22 to lower the kneaded material, cooling device 23 for cooling the kneaded material, hopper And a device constituting the 24 and the reservoir 25.

Referring to the operation according to the above device, the mold casting is completed, the mold caster is put into the vibratory spinneret 15, and the vibratory spinneret is transferred to the belt conveyor 16 to be put into the shredder 17 and crushed. The crushed waste foundry sand is passed through a vibrating body 18 having a predetermined mesh (mesh) to flow to the pedestal 22, while dropping and mixing a binder (bentonite, etc.) and the like from the hopper 19 located at the rear end thereof, Cooling device such as air while spraying water from the water spray 20 to the lower part while kneading the rotary kneading body 21 having a constant mesh installed under the spray 20 while controlling humidity. It is stored in the reservoir 25 through the hopper 24 while cooling by 23.

The conveying means for conveying the waste foundry sand from the vibratory decanter 15 of the device structure is possible through other conveying means such as a conveying means having a screw in the same cylindrical body as that of the existing structure, not the belt conveyor. It is not limited to the conveyor 16.

In addition, the shredder 17 is a structure having a toothed portion in each screw, but is not limited thereto because it is also possible to have a structure having other conventional shredding means.

The cooling device 23 is illustrated as being located on the rear surface of the hopper 24, but is not limited thereto, and may be installed at any position between the rear surface of the water spray 20 and the hopper 24.

In addition, the rotary kneader 21 for kneading the mixture of the caking agent mixed with the waste foundry sand is shown as being integrally formed with the water spray 20, but may be installed separately from the water spray 20, so that the water spray It is not limited to what was comprised integrally with.

The present invention for regenerating waste molding sand using the device configured as described above is a series of vibration desalting means → conveying means → crushing means → screen means (sieve) → binder dispensing means → humidity control means → kneading sieving means → cooling means By continuously manufacturing a continuous process in one device, it is possible to reclaim waste casting sand having a low manufacturing cost by reducing the cost of equipment and continuous manufacturing by reducing and minimizing the process equipment.

As described above, the present invention implements a series of means such as crushing and screening, addition of new raw materials, humidity control, kneading sieving, cooling, etc. in order to improve the problems caused by existing intermittent processes and devices. In addition, it is possible to obtain waste foundry sand having inexpensive manufacturing cost as a process of miniaturization and miniaturization or continuous process.

Claims (4)

A first step of removing and separating the waste foundry sand from the product of the mold, a second step of transporting the discarded waste foundry sand to a crusher, and a third step of filtering the crushed waste foundry sand through a sieve, and dropping a binder into the waste foundry sand passed through the sieve. A fourth step of controlling the humidity by spraying water on the mixture, a fifth step of kneading the foundry sand mixture conveyed through the means, and then cooling and storing the mixture. Recycling method of waste foundry sand. Vibration desorption machine 15 for removing and separating the waste molding sand from the product of the mold frame, transfer device 16 for transferring the waste molding sand discharged from the vibration eliminating machine 15, disposed on the side of the conveying device to crush the waste molding sand A crusher 17 for discharging raw materials, such as a caking agent, located at the rear end of the crusher 17, a screen for filtering waste casting sand discharged from the crusher 17, the vibrating body 18 ), A water spraying device 20 installed at the rear end of the hopper 19, a rotating body 21 for kneading the mixture, a pedestal 22 for lowering the kneaded material downward, and cooling the kneaded material. And a storage tank (25) stored through the cooling device (23) and the hopper (24). The method of claim 2, Recycling processing apparatus for waste foundry sand, characterized in that the conveying device (16) consists of a screw provided in a belt conveyor or a cylindrical body. The method of claim 1, The regeneration treatment apparatus of waste foundry sand, characterized in that the cooling device 23 is a device for blowing air.