KR810001841B1 - Apparatus for foundry sand reclamation - Google Patents

Abstract

No content.

Description

Foundry sand regeneration device

1 is a schematic longitudinal cross-sectional view of one embodiment of the device of the present invention.

2 is a partial longitudinal cross-sectional view of only the vicinity of the rotating drum and the annular disk in another embodiment of the present invention.

The present invention relates to a reproducing apparatus that enables reuse of old foundry sand used in a casting mold.

Foundry sand is used repeatedly from an economic point of view. However, once used casting sand contains hardened and burned caking additives, and some of the sand is undifferentiated by thermal shock, etc., so it is necessary to remove it.

2. Description of the Related Art Conventionally, as a method for regenerating foundry sand, a lot of dust is removed by cyclone or the like by blowing old sand mechanically in the air stream or by mechanically driving old sand.

However, the apparatus which performs these methods has the fault that the main part is abrasion by sand, and the parts must be replaced again.

An object of the present invention is to provide a device that can be recovered from the sand and found to be economical and smoothly with little wear place by the sand.

The present invention,

(a) It consists of a cylindrical body with a supply port of old sand at the top, a rotating drum at the center of the dust intake population, and a recycled sand outlet at the bottom;

(b) a distributor is provided for uniformly supplying the used sand, which is connected to the supply port, to the periphery of the rotating drum base plate,

(c) The rotating drum opens at one side and faces the opening upwards in a high speed horizontally around the axis, scattering the used sand introduced into the rotating drum over the circumferential wall of the rotating drum,

(d) A cross-section annular shelf having a lower flange portion at approximately the same height as the upper edge of the opening of the rotating drum faces the flange portion inwardly and is spaced apart from the cylindrical body and held therein. The gap width between the lower flange end of the annular shelf and the rotating drum is freely adjustable.

(e) The lower side of the rotating drum is equipped with a fan that is in agreement with the rotating drum, and has one end in contact with the central inlet of the fan, and an intake pipe is provided outside the cylindrical body. It is a foundry sand reproducing apparatus.

Hereinafter, the present invention will be described with reference to the drawings.

1 is a longitudinal sectional view of one embodiment of the present invention.

In the present invention, the old sand (10) in the upper portion of the supply port, the old sand hopper (2), the dust suction port (3) is installed, the rotating drum (4) is installed in the center, the bottom of the regeneration sand (5) It consists of a cylindrical body (1) installed.

In addition, a distributor 6 is connected to the hopper 2 so as to uniformly supply the used sand to the periphery of the bottom plate of the rotating drum 4. 6a is a support piece that connects the distributor 6 to the hopper 2.

The rotating drum 4 opens one side of the drum, and is disposed at the center inner center of the cylindrical body 1 with its opening upward. 4a is a circumferential wall, and 4b is a base plate. The rotating shaft 4c, which is formed at the shaft center of the rotating drum 4, is supported on the cylindrical body 1 by the bearing case 7a (not shown), and the V pulley 7b is mounted at the bottom thereof. The rotor 7e rotates the V pulley 7d and the belt 7c in between.

The old sand 10 fed into the rotating drum 4 is scattered beyond the circumferential wall 4a of the rotating drum 4.

In the cylindrical body 1, the annular shelf 8 having a cross section (C) has the flange part 8as at the height of the opening edge of the rotating drum 4, that is, approximately the same height as the end of the main wall 4a. It faces inward, spaces 8d from the cylindrical body 1, and is hold | maintained by the cylindrical body 1 as the support 8e. 8a is a lower flange part, 8b is a web part, and 8c is an upper flange part.

The tip of the lower flange 8a needs to be elongated at intervals 8g so that the used sand 10 which is scattered by the centrifugal force from the inside of the rotating drum 4 does not fall downward.

The old sand 10 is scattered while being rubbed from each other by the centrifugal force from the rotating drum 4, and is subjected to friction while being collided with the sand layer formed on the web portion 8b and the lower flange portion 8a of the annular shelf 8. 8g).

The gap 8g is freely adjustable for the reason described later in detail.

In addition, the fan 9, which is aligned with the rotary drum 4 and the shaft center, is provided under the rotary drum 4 in one body. In addition, the tip is in contact with the central suction mechanism (9a) of the fan (9), the intake pipe (11) for communicating with the outside of the cylindrical body (1) is provided.

In the illustrated embodiment, although the intake pipe 11 is shown surrounding the bearing case 7a, the V pulley 7b, the V belt 7c, and the V pulley 7d, an example is shown. It is desirable in structure to avoid contact with organs.

Although the intake hole of the intake pipe 11 is not shown in the figure, the operation window of the V pulley 7d may be used together, or an enemy may be provided.

Next, the operation method of the apparatus of this invention is demonstrated.

The old sand is uniformly supplied in a cylindrical curtain state from the hopper 2 to the sand stuck by the centrifugal force to the inner wall of the rotating drum 4 by the distributor 6.

The falling sand cannot go along with the high-speed rotation of the rotating drum 4, so that a shear phenomenon occurs in the sand layer, and the sand surface is polished to remove the deposit. Since the angle of the sand stuck to the rotating drum is kept almost the same as the usual angle of repose, the sand continuously supplied flows to the upper end according to the angle of repose, but is subjected to the aforementioned shearing action and accelerated in the circumferential direction. Therefore, the sand overflowing from the top is a powerful centrifugal force acts to fly around at high speed. There is an annular shelf, and the annular shelf is covered with sand scattered first, and the sand scattered from the rotating drum collides with the wrapped sand at high speed, and the attachment is separated.

The sand that overflows from the annular shelf is blown in the circumferential direction by a branching flow made by a rotating drum and a single body. It is discharged from (5).

The dust suction port 3 is generally connected to a dust collector.

The nematode 9 not only blows dust, but also sucks cold air through the circumference of the bearing of the rotating shaft 4c, and thus is used for cooling the bearing part that is easily overheated by treating high temperature sand.

The apparatus of the present invention is used as one end of the unit of the above-described configuration, but can be used by stacking multiple stages as necessary.

In FIG. 1, the situation in the case of lamination | stacking in two stages is shown by the cylinder 1 'and only 1 part of the dust inflow population 3'.

The quality of the reclaimed sand can be adjusted by adjusting the throughput and selecting the treatment tool and the rotary tool.

In the apparatus of the present invention, it was possible to regenerate the old cell waste sand with a burn loss of 1.7% with a burn loss of 0.83%, that is, with a removal rate of 51%.

In the case of gaseous used sand, the amount of alkali could be recovered from 7.01ml to 3.32ml, that is, 53% removal rate.

In other states of the apparatus of the present invention, as shown in FIG. 2, the interval 8g between the rotating drum 4 and the lower flange portion 8a of the annular shelf 8 is narrowed and falls from the interval 8g. The amount of sand supplied from the distributor 6 is greater than the amount of sand to be used.

In this case, the sand stagnates in the space surrounded by the rotating drum 4 and the annular shelf 8, so that the sand overflows the upper flange 8c of the annular shelf 8, and from the gap 8d. The amount of stagnant sand is kept constant at the time when the fall starts and the fall amount from the gaps 8d and 8g coincides with the supply amount.

In such a state, since the rotating drum continues to rotate, the fixed layer of sand adhered to the inside of the rotating drum by centrifugal force as indicated by the dissipation point in FIG. do.

However, since the sand deposited on the upper side does not rotate and is on the rise, there is an interface between the fixed layer that rotates with the rotating drum, and the friction is made because the weight of the deposited sand is added to the surface. It is a peeling action of the deposit. The deposited sand descends from the center, as it is vortexed, and rises according to the fixed bed, moreover, rises along the fixed bed of the annular shelf, overflows from the upper flange, or flows in the rotating drum, annular shelf. After the cycle repeats, overflows.

Since they move secretly in this way, the sand is rubbed evenly and the attachments are efficiently scraped off.

The friction between the grains of sand is very small because the mass of each other is small between the grains, but the friction between the grains of sand is strong. In this state, the state of the electrons and the action path of the sand are different, strong interparticle friction is achieved, and the sand deposit separation efficiency can be remarkably improved.

Changing the device of the previous embodiment to this embodiment is possible because the annular shelf is removable (just by placing it on the support 8e), and the ring is connected to the lower flange.

In this state, the sand used in the present invention was regenerated and used in four stages, and the burn loss was reduced from 1.97% to 0.77% (removal rate 61%). And the recovery was 92%.

The device of the present invention has the following effects. That is, wear is extremely small. In addition, since there is little wear, effort for maintenance inspection such as replacement of parts is reduced.

In addition, the sand has little fracture due to friction and collision between the sands.

The device of the present invention has a simple structure, and therefore, low production cost. Moreover, it is compact and can be laminated | stacked several times. In addition, since the bearing part is cooled by cold air, hot sand treatment is possible.

In the device of the present invention, it may also be considered that the cross-section (b) is an annular shelf except for the upper flange portion of the cross-section (c) -shaped annular shelf. Since it becomes short, it is necessary to raise the vertical part corresponded to a flange part, and a cross-sectional (c) shape is preferable.

Claims (1)

(a) consisting of a cylindrical body with a supply port of old sand and dust suction in the upper part, a rotating drum in the center, and a recycled sand outlet in the lower part; and (b) a rotating drum connected to the supply port. Distributors are provided for uniformly dispensing at the periphery of the base plate, and (c) the rotating drum opens one side and rotates the old sand fed into the rotating drum by rotating it at high speed horizontally around the shaft center with its opening upward. (D) a cross-sectional annular shelving with its lower flange part at approximately the same height as the upper edge of the opening of the rotating drum, with its flange part facing inward and slightly It is held on the cylindrical body at intervals of, and the width of the gap between the lower flange end of the annular shelf and the rotating drum is to be freely adjusted. Fans for the rotating drum and the axis match is doeyeo device body hanmom facing the one end to the central inlet of the fan, the molding sand reproducing apparatus, characterized in that the intake pipe leading to the outer cylindrical body is provided.

Images