KR200353464Y1 - Reclamating apparatus of used sand - Google Patents

Abstract

The present invention relates to a recycling apparatus for waste foundry sand, and more particularly, a hopper (11) having a grinder (111) for crushing waste recycled sand to be recycled, and a conveyor for transporting and feeding sand at a lower portion of the hopper (11). A primary chute (13) having a transfer chute (12) having a built-in, a rotating screw (131) for separating a binder from sand supplied by the transfer chute (12) and transferring it to an upper side; A plurality of vibration motors 14 installed on the lower side of the rotating screw 131 and installed in parallel with the primary separator 30 so as to separate dust and caking additive from sand falling to the lower side again. In the secondary separator 15 alternately installed wings 151, the dust separator 16 for collecting only the dust suspended in parallel with the secondary separator 15, and the secondary separator 15 Storage where sand dropped to the lower side is stored As a reproducing apparatus, it characterized in that the molding sand composed of 17, there is an effect of prevention of environmental pollution and recycling of resources.

Description

Reclamating apparatus of used sand}

The present invention relates to a recycling apparatus for waste foundry sand using a polyhydric alcohol-based binder which can reuse the waste foundry sand using a polyhydric alcohol-based binder as a gentleman substitute.

In general, foundry sand contains casting compounds made of various compounds in casting sand having a particle size of about 20 to 70 mesh, to make molds conforming to the shape of the product to be cast. Will be cast.

In this case, when the molten metal is injected, the binder is carbonized and hardened on the surface of each molding sand by high temperature, and the waste casting sand with the carbonized hardening binder is directly used for the next casting without additional treatment. In other words, factors that adversely affect the casting product, such as a decrease in the binding force between the molding sand and the breathability of the mold.

Particularly, the CO ₂ mold hardens the mold by blowing CO ₂ gas into the molding sand to which the silicate-based caking additive is added to the private particles, that is, the blown CO ₂ gas chemically reacts with sodium silicate to form a colloidal phase. As a silica gel, it combines private particles, and the CO ₂ mold made of sodium silicate as a caking agent has poor disintegration of the mold after pouring, which makes it difficult to regenerate the waste foundry sand, making it difficult to repeatedly use the foundry sand. There are drawbacks such as increased disposal costs.

In addition, the prior art Published Patent Publication No. 1998-035741 puts the waste casting sand obtained from the casting mold after the molding operation into the water washing container (3) through the hopper (1) and the belt conveyor (2) and stirred with water to soluble in the casting sand. The adhesive is removed, and the washed casting sand is transferred to the drying unit 12 through a transfer device 9 provided with a transfer screw 10 to be dried and recycled.

The wet regeneration method requires an additional device such as a vibrator because it can not easily remove the binder attached strongly to the surface of the waste foundry sand, and the waste water generated at this time causes environmental pollution There was a lot of difficulty in dealing with this.

In addition, the dry regeneration method imparts a friction between the abrasive and sand particles by dropping the binder on the sand surface by colliding the sand with a hard object, and abrasion between the abrasive and sand particles falling on the abrasive stone to remove the surface deposit. There is eating.

In the above method, the impact type lowers the recovery rate by crushing and excessive atomization of the sand particles, and in the friction type, the flow rate of the sand particles is not smooth and the regeneration is not uniform. Due to the large amount of stagnant sand inside, it takes a lot of time and trouble to remove the residual sand in the device, and the regeneration efficiency is lowered.

In addition, in the case of the mechanical vibration method by the air flow, the overall configuration of the vibrating device is very complicated, and it has a problem that it takes a lot of time and money to process the waste foundry sand with a casting sand of a certain purity or more.

The present invention has been made to solve the above problems, to improve the regeneration treatment speed and the purity of the foundry sand to separate and remove the binder attached to the surface of the waste foundry sand, breakage of the foundry sand generated during the regeneration treatment of the waste foundry sand The purpose of the present invention is to provide a recycling apparatus for waste foundry sand using polyhydric alcohol-based binders that can be repeatedly recycled even in a narrow space by minimizing the size and compacting the overall configuration of the recycling apparatus.

The present invention for achieving the above object is a hopper with a built-in crusher for pulverizing the recycled waste molding sand, a transfer chute located in the lower portion of the hopper for feeding and supplying sand, and a binder from the sand supplied by the transfer chute A primary separator having a rotating screw for separating and conveying to the upper side, a vibration motor installed at the lower side of the rotating screw to generate vibration, and dust and dots from sand falling down to the lower side installed in parallel with the primary separator. A secondary separator in which a plurality of wings are alternately installed to separate the payment again, a dust removal device installed in parallel with the secondary separator to collect only floating dust, and sand dropped to the lower side by the secondary separator. It is composed of a storage container for transporting through the discharge chute, the dust removal device is a dust collector to suck the dust suspended by the secondary separator A dust collecting filter for filtering dust picked up by the motor, the dust collecting motor, an air outlet for discharging the filtered air into the atmosphere, a dust chute for transferring the dust adsorbed to the dust collecting filter, and the dust chute Provided is a recycling apparatus for waste foundry sand using a polyhydric alcohol-based binder having a dust collecting container for storing dust.

1 is a side cross-sectional view showing the structure of a reclaiming device of the present invention sand casting.

2 is a plan view showing the structure of a reclaiming apparatus of a foundry sand according to the present invention;

Figure 3 is a graph comparing the residual strength of the mold using a polyvinyl alcohol polyvalent alcohol of the present invention as a caking additive and a mold using a conventional sodium silicate caking additive.

Figure 4 is a graph showing the compressive strength in the case of the mold blown with CO ₂ gas after the addition of the polyvinyl alcohol of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: foundry sand recycling apparatus 11: hopper

12: transfer chute 13: primary separator

14: vibration motor 15: secondary separator

16: dust removal device 17: storage bin

111: grinder 121: conveyor

131: rotating screw 151: wing

161: dust collecting motor 162: dust collecting filter

163: air outlet 164: dust chute

165: dust collector a: graph of sodium silicate

b: Graph of polyvinyl alcohol c: Pressure of mold of polyvinyl alcohol injection

Shaft strength graph

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, referring to the accompanying drawings, Figure 1 is a side cross-sectional view showing the structure of the recycling apparatus of the foundry sand of the present invention, Figure 2 is a plan view showing the structure of the recycling apparatus of the molding sand of the present invention, Figure 3 is polyhydric alcohol sealed polyester and vinyl comparing the residual strength of the mold graph of the mold with a conventional sodium silicate alcohol to point payment to point payment, Figure 4 is blown into the CO ₂ gas followed by the addition of the polyvinyl alcohol of the subject innovation This graph shows the compressive strength of one mold.

As shown in FIGS. 1 and 2 showing the structure of the reclaiming apparatus of the present invention, a hopper 11 having a grinder 111 for pulverizing the reclaimed waste molding sand and a lower portion of the hopper 11 are located. 1 is provided with a transfer chute 12 having a conveyor 121 for transporting and supplying sand, and a rotating screw 131 separating the binder from sand supplied by the transfer chute 12 and transferring the upper side to the upper side. The dust separator 13 and the vibration motor 14 installed at the lower side of the rotating screw 131 to generate vibration, and the dust and dots from sand falling in the lower side installed in parallel with the primary separator 30. A secondary separator 15 in which a plurality of wings 151 are alternately installed so as to separate the payment again, and a dust removal device 16 for collecting only the dust suspended in parallel with the secondary separator 15; Sand dropped to the lower side by the secondary separator 15 is stored It is to be composed of a reservoir (17).

The dust collecting device 16 includes a dust collecting motor 161 for sucking dust suspended by the secondary separator 15, and a dust collecting filter 162 for filtering dust sucked by the dust collecting motor 161. An air outlet 163 for discharging the filtered air into the atmosphere, a dust chute 164 for transporting the dust adsorbed to the dust collecting filter 162, and a dust transported by the dust chute 164; The dust collector 165 is provided with a structure.

That is, the waste foundry sand recycling apparatus of the present invention is pulverized the sand mold used in the casting process with a pulverizer is supplied to the waste foundry sand pulverized to the hopper 11 through a drying furnace and iron removal device.

Then, the casting mold is put into the vibratory decanter into the vibratory desawing machine is put into the pulverizer (111) placed in the hopper 11 and crushed the waste foundry sand. At this time, the crushed waste molding sand is stored in the lower side of the hopper while passing through a vibrating body having a predetermined mesh (mesh).

The conveying means for conveying the waste foundry sand to the hopper may be performed through other conveying means such as a conveying means having a screw in the same cylindrical body as the existing one, rather than a belt conveyor.

In addition, the pulverizer 111 is not limited thereto because it is possible to have a structure having a toothed portion in each screw or other conventional crushing means in order to increase the crushing efficiency of the waste foundry sand.

The exit diameter of the hopper 11 is adjusted to a pre-planned size to maintain a constant waste casting sand throughput per hour and to maintain a constant friction between the sand particles, and if the continuous amount of free fall from the outlet of the hopper 11 The waste foundry sand is fed to the inside of the primary separator 13 by a transfer chute 12 driven by the electric motor M.

And the waste molding sand supplied to the primary separator 13 is rotated and transported from the lower side to the upper side by the rotating screw 131 rotating by the vibration motor 14, the sand is conveyed by the rotating screw 131 When these particles collide with each other, various types of binders adhered to the sand surface are abrasion-separated from each other, and a primary regeneration operation is performed to regenerate waste molding sand.

Thereafter, the sand is transferred to the upper side by the rotating screw 131 and at the same time as the vibration is generated by the vibration motor 14, the sand is generated friction between the particles and the secondary regeneration is made.

In this regeneration process to smoothly induce the flow of sand to increase the regeneration efficiency and the dust generated during regeneration is sucked into the dust collecting device 16 by the dust collecting motor 161 in the main body, the filtered air outlet 163 It is discharged to the atmosphere through the dust is all adsorbed on the surface of the dust collecting filter 162.

On the other hand, the sand is transported to the upper side by the rotating screw 131, the sand is separated from the sand hit the wing 151 alternately installed inside the secondary separator and falls to the lower side, at this time the sand hit the wing 151 Is not separated from the caking additive and dust is separated and the lower side is transported and stored in the reservoir 17 by the discharge chute after collecting. At this time, the dust is separated from the floating sand is all collected in the dust removal device 16 installed on one side.

For reference, referring to FIG. 3, which is a graph comparing residual strengths of a mold using polyvinyl alcohol, which is a polyhydric alcohol, as a caking material, and a mold using caustic soda silicate, a mold using a polyvinyl alcohol, a polyhydric alcohol, as a caking material It can be seen that the residual strength at high temperature is remarkably low, so that it is regenerated after the casting and regeneration process after casting.

In addition, as shown in FIG. 4, which is a graph showing compressive strength in the case of a mold in which CO ₂ gas is blown after the addition of polyvinyl alcohol, it can be seen that the strength of the present invention is sufficient to serve as a mold. .

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be apparent to those who have knowledge.

As described above, according to the present invention, the waste foundry sand used in various types of casting processes can be recycled so as to be reused at a low cost, and a new gentleman also undergoes a regeneration process according to the present invention. By improving the functional characteristics that foundry sands have, such as), the waste foundry sands classified as industrial wastes are reused to prevent the depletion of sand, which is a natural resource, and to prevent environmental pollution caused by landfilling of waste foundry sands, By using it as a raw material of bricks, lightweight porous materials, etc., it has the effect of providing environmental protection and clean production technology by completely eliminating waste.

Claims (2)

A transfer chute 12 having a hopper 11 having a grinder 111 for pulverizing recycled waste molding sand, a conveyor 121 having a lower portion of the hopper 11 for feeding and supplying sand, and the transfer chute The primary separator 13 is provided with a rotating screw 131 for separating the binder from the sand supplied by the (12) and transported to the upper side, and is installed on the lower side of the rotating screw 131 to generate vibration. Vibration motor 14 and the secondary separator (15) installed side by side with the primary separator (30) alternately installed a plurality of wings (151) to separate the dust and caking additive from the sand falling to the lower side again. And a dust collecting device 16 installed only in parallel with the secondary separator 15 to collect only floating dust, and a storage tank 17 storing sand dropped to the lower side by the secondary separator 15. Lung with polyhydric alcohol system as a binder Water's playback device. The dust collecting device (16) according to claim 1, wherein the dust collecting device (16) includes a dust collecting motor (161) for sucking dust suspended by the secondary separator (15) and a dust collecting filter for dust sucked by the dust collecting motor (161). The filter 162, an air outlet 163 for discharging the filtered air into the atmosphere, a dust chute 164 for transferring dust adsorbed to the dust collecting filter 162, and the dust chute 164 is transferred by the dust chute 164. A recycling apparatus for waste foundry sand comprising a polyhydric alcohol-based caking agent, comprising a dust collecting box 165 for storing the collected dust.