JP2521765B2 - Foundry sand reclamation equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a molding sand recycling apparatus.

<Prior art> In order to regenerate foundry sand that has been used for casting, it must be crushed by a crusher, etc., because it is made into a large lump by a binder etc. However, it is necessary to remove adhering substances such as a binder adhering to the particles of the crushed foundry sand. Therefore, in order to polish the surface of raw sand and used particles, various devices have been considered so far. For example, a device that polishes the surface of the sand by ejecting foundry sand from an air nozzle to make it collide with a collision member (Japanese Utility Model Publication No. 50-50808), or insert the sand into a device that has rotating blades and centrifuge it. A device that strongly collides sand with force to polish its surface (JP-A-57-109540), a device that puts sand into a rotating tank and rubs it against each other, a resin that heats sand and adheres to the surface, etc. There is a device that burns and volatilizes, or a device that rinses sand with water to wash away unnecessary substances on the surface.

<Problems to be solved by the invention> However, in each of the above-mentioned devices, it is only possible to use some granular molding sand, and since the polishing capacity is limited, In the process, there are problems such as being very troublesome and time consuming.

Therefore, it is an object of the present invention to provide a reproducing apparatus that solves the above-mentioned problems and can perform the series of steps continuously.

<Means for Solving Problems> The above object of the present invention can be achieved by an apparatus having the following configuration. That is, the gist of the invention is to provide a molding sand extruding passage at the bottom of the molding sand feeding hopper, mount an extruding member that can be extruded from the rear of the molding sand extruding passage, and rotate the casting sand extruding passage in front. A grindstone body is provided, and above the rotary grindstone body, a lower portion is formed into a squeezed shape, and an opening portion at which a tip end thereof can be freely opened and closed is placed. A storage part for impurity disposal that can be taken out freely is provided below, and the upper and lower parts of the casting sand tank for recycling are divided into two parts to form upper and lower spaces, and the upper and lower spaces are freely formed. A partition plate having a mechanism for making the parts in communication with each other is provided, while a depressurization transfer pipe is provided in communication from the lower part of the casting sand tank for recycling into the upper space part of the casting sand tank for recycling, Bottom and above times A grindstone body is a casting sand reproducing apparatus being characterized in that allowed encapsulated communication form and without, moreover a fan blow the lower the down pressure conveying tube by moving passage having a sieve mechanism.

<Examples and Functions> The foundry sand reclamation apparatus according to the present invention will be described in detail below with reference to the drawings showing the examples.

FIG. 1 is an overall explanatory view showing one embodiment of the foundry sand reclamation apparatus of the present invention.

That is, this foundry sand reclaiming apparatus is provided with a foundry hopper (1) for feeding foundry sand, an extruding member (2) provided in the lower part thereof, a rotary grindstone body (3) placed in front of the extruding member (2), and an upper portion thereof. It has a large space over which the opening (4) is located, and is composed of a reclaimed casting sand tank (5) for separating the generated fine powder and sand by specific gravity.

As the extruding member (2), various mechanisms such as a crank mechanism can be considered in addition to the cylinder mechanism shown in the present embodiment, and these mechanisms may be stopped and pressed by the own weight of the agglomerated sand. , It is desirable to adopt the mechanism most suitable for the situation.

That is, a molding sand extrusion passage (6) is formed in the lower portion of the molding sand charging hopper (1) having an open upper end, and the extrusion member (2) slides in the molding sand extrusion passage (6). It is movably fitted. That is, the large-sized molding sand that has been charged into the molding sand charging hopper (1) is filled in the molding sand extruding passage (6), and is extruded forward from the rear by the extruding member (2). Therefore, in front of the casting sand extruding passage (6), a rotary grindstone body (3) having a rotating surface is provided so as to be rotatable by a drive motor (7), and the casting member (2) is used for casting. The sand is configured to be crushed and polished by being pressed against the rotary grindstone body (3).

Further, the opening is located below the rotary grindstone body (3) below the molding sand extruding passage (6), and impurities such as a core metal and iron pieces generated when the molding sand is crushed into particles are stored. The storage unit (8) for impurity disposal which can be taken out freely is attached.

The lower portion of the reclaimed casting sand tank (5) is formed into a squeezed shape, and an opening (4) is provided at the tip of which can be opened and closed. In addition, a dust collector (not shown) transfer pipe (9) is provided above the reclaimed casting sand tank (5).
And a depressurized transfer pipe (10) for transferring granular molding sand crushed and polished by the rotary grindstone body (3) into the recycling molding sand tank (5). A blow-up fan (11) is provided below the depressurized transfer pipe (10). Therefore, a transfer passage (12) is provided in communication between the lower portion of the reduced pressure transfer pipe (10) and the rotary grindstone body (3), and further finely moved to the upper surface of the transfer passage (12). A mesh-like sieving net member (13) is provided for sieving the sand that has been sanded into particles. That is, the casting sand put into the transfer passage (12) is decompressed in the recycling casting sand tank (5) by a dust collector (not shown) and blown up from below by the blowing fan (11). Cast sand tank for recycling without any hindrance by the generated air flow (5)
It is possible to carry it inside. A partition plate (14) as shown in FIG. 2 is provided in the middle of the reclaimed casting sand tank (5) to form upper and lower spaces a, a '. Holes (15), (15), ... Are opened on the surface of the partition plate (14) at required intervals, and the holes (15), (15), ... Are always under the partition plate (14). Horizontally movable partition plates (14 ') with holes (15'), (15 '), ... located between them are mounted in a stack, and the partition plates (14')
Is moved laterally by a traverse cylinder (16) provided on the side of the casting sand tank for recycling (5), and the hole (1
5), (15), ... and (15 '), (15'), ... are arranged at the same position.

In the device of the present invention having the above-described structure, as shown in FIG. 3, the large-sized molding sand A that is charged into the molding sand charging hopper (1) is extruded from the molding sand extruding passage (6). A rotating grindstone body (3) that is extruded by (2) and driven to rotate
It will be pressed against the surface and crushed and polished. In other words, in this case, the iron pieces and the core metal attached to the above-mentioned molding sand A are automatically stored in the withdrawable storage container (8) for impurity disposal, and only the molding sand A in the form of granules is on the transfer passage (12). Reduced pressure conveying pipe (10) which is further sieved by the sieving mesh member (13)
Of the casting sand tank (5) for recycling by the air flow generated by suction by the blowing fan (11) and the dust collector (17) provided below the base of the depressurized transfer pipe (10). It is housed in the upper space part a and is stacked on the partition plate (11). The dust generated from the granular molding sand A when being dropped into the upper space a is collected by the dust collector (17),
The upper space portion a has a space enough to perform its working process. Then, at the time when a predetermined amount is stacked on the partition plate (11), the operation of the pushing member (2) is stopped, the partition plate (14 ') is laterally moved, and the holes (15),
(15), ..., (15 '), (15'), ... are aligned and the molding sand A stacked on the partition plate (14) is added to the above (15), (15), ..., (15 '), (15'), ..., Drop into the lower space a ', and then drop through the opening (4) to the surface of the rotary grindstone (3), and again contact the foundry sand. A is polished and stored in the reclaimed casting sand tank (5) by the reduced pressure transfer pipe (10) in the same manner as above. That is, by repeating the process several times until the predetermined degree of polishing of each process is reached, the molding sand A
Indicates that the deposit is completely removed.

Finally, the reclaimed molding sand A is directly taken out from the reclaimed molding sand tank (5), and the reclaimed sand storage tank (18) is reclaimed from the recycling casting sand tank (5).
It is carried in by a carrier pipe (19) or stored as shown in the figure as an example.

<Effects of the Invention> As described above, according to the device of the present invention, crushing, transportation,
A series of steps of polishing and storage can be continuously performed by one device, and further, there is an effect that the polishing of the foundry sand can be completed in a short time by repeating the steps.

Further, since all the above work steps are carried out in the apparatus, dust generated during crushing and polishing is completely sucked by the dust collector, and it is possible to recycle without pollution without damaging the environment. It has various effects such as not requiring a large power source.

[Brief description of drawings]

FIG. 1 is an overall explanatory view showing an embodiment of the device of the present invention, and FIG.
FIG. 3 is an enlarged perspective view of an essential part taken along the line II-II, and FIG. 3 is a schematic explanatory view showing a usage state of the present invention. In the figure, a, a ': upper and lower spaces (1): hopper for casting foundry sand (2): extruded member (3): rotating grindstone (4): opening (5): casting sand tank for recycling (6): Foundry sand extrusion passage (8): Impurity waste storage (10): Reduced pressure transfer pipe (11): Blow-up fan (12): Transfer passage (13): Sieve mesh member (14 ') ), (14 '): Partition plates (15), (15), (15'), (15 '), ...: Holes

Claims (1)

(57) [Claims] 1. A molding sand extruding passage is provided in a lower portion of a molding sand feeding hopper, and an extruding member fitted so as to be extrudable from the rear of the molding sand extruding passage is attached to the casting sand extruding passage in front of the molding sand extruding passage. A rotary sandstone body is provided, and above the rotary stonestone body, a lower portion is formed in a squeezed shape and an opening portion at which the tip end thereof can be freely opened and closed is placed, and a recycle casting sand tank is erected. A storage section for impurity disposal that can be taken out freely is provided below the passage, and the upper and lower sections of the casting sand tank for recycling are divided into two, upper and lower space sections are formed, and the upper and lower sections are freely arranged. A partition plate having a mechanism for making the space part in communication is provided, while a depressurization transfer pipe is provided in communication from the lower part of the recycling casting sand tank into the upper space of the recycling casting sand tank, and the depressurization transfer is performed. Rotate above the bottom of the tube A stone body, communicating like and without the transfer passage having a sieve mechanism, moreover foundry sand reclamation system is characterized in that allowed containing the fan blow the lower the down pressure conveying pipe.