JPH03279Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to an apparatus for separating molding sand mixed therein from a group of steel shots used for backing up shell molds.

<Prior Art> Conventionally, as seen in Japanese Patent Application Laid-Open No. 56-41044, a shell mold is backed up with a shot, but this type of device for separating the molding sand mixed in the shot does not require a steel shell. An oscillating conveyor with a punching metal stretched over it is installed below the outlet of the hopper that stores the shot group, and the shot group is discharged by falling onto the punching metal, and while the oscillating conveyor is running, molding sand is passed through the punching metal. The steel shots were separated and discharged downward, and the steel shot group was collected from the tip of the oscillating conveyor.

<<Problems to be solved by the invention>> However, in the conventional apparatus described above, the object to be conveyed is a hard steel shot, and this is repeatedly vibrated on the punching metal.
The punching metal wears out in a relatively short period of time and must be replaced frequently, making it extremely uneconomical.

The present invention was developed in view of the above-mentioned problems, and its purpose is to provide a device for separating mold sand from a casting back-up site that can separate mold sand and flash in an extremely economical and efficient manner. It is about providing.

<Means for Solving the Problems> In order to achieve the above object, a slope descending toward the lower end outlet in the hopper for storing the steel shot group used for shell mold backup by the apparatus of the present invention is provided. A plurality of slits are formed in the floor plate along the downstream direction of the shot group. The slits are formed so that they gradually become wider as they move in the downstream direction, and a portion of the shot group falls through these slits to the outside of the hopper. Furthermore, an air passage is formed below the slit at intervals, and this air passage is communicated with the suction dust box.

<<Operation>> When the steel shot group collected in the hopper is discharged from the hopper, the shot group moves along the inclined floor plate that descends toward the discharge port in the hopper, and most of the steel shots are discharged from the hopper. Go inside. Among the steel shots that have entered the slit, those with no molding sand attached to them immediately fall through the slit to the outside of the hopper, but those with a relatively large amount of molding sand adhered to them pass through the narrow upper part of the slit. Unable to do so, it moves along the slit to a lower wide part, passes through this wide part, and falls downward. Since the degree of adhesion of molding sand to the steel shot varies, the steel shot falls from the entire slit to the outside. When the steel shot falls, the molding sand that is partially scraped off and separated at the corners of the slit also falls through the slit to the outside of the hopper. Note that the steel shot group in the hopper often contains pieces of cast flash, and even if these pieces of cast flash fit into the slits, the slits are wide on the downstream side, so they can easily fall downward. pass through. At this time, since the lower part of the slit is an air passage and communicates with the suction dust box, the molding sand and casting burrs that fall from the slit are sucked together with the air and collected in the dust box. On the other hand, the steel shot that fell from the slit,
Because of its large mass, other steel is not suctioned by the air and is completely separated from the molding sand, etc. that falls from here, collected from the bottom of the air passage, and discharged from the outlet of the hopper. It is assembled with a group of shots and made available for reuse.

<<Embodiments>> Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 indicates a hopper, and this hopper is for temporarily retaining a steel shot 2 used for backing up a shell mold. The bottom of the hopper 1 is a ship bottom-like inclined surface, and the first inclined floor plate 2a shown on the right side in FIG. 1 is connected to the second inclined floor plate 2b shown on the left side.
It extends further downward beyond the lower end, and the base end of the opening/closing gate 3 is pivoted to the lower end of the second inclined floor plate 2b. This opening/closing gate 3 is substantially vertical when not in operation, and its lower end abuts the lower end of the first inclined floor plate 2a, and this hopper 1
The lower discharge port 4 is closed.

The lower part of the first inclined floor plate 2a of the hopper 1 has a large number of comb-shaped slits 5 as shown in FIG.
is formed to penetrate along the inclined surface. Each of the slits 5 is formed to have a narrow upper part shown on the right side in FIG. 2, and gradually become wider as it moves to the lower part, and an example of its dimensions is the diameter of the shot used. For 3-8mm, the narrowest part at the top is about 3mm, the widest part at the bottom is about 15mm, and the length is about 100mm.
The angle of inclination is approximately 30°.

A wear-resistant steel plate 6 is arranged parallel to the outside of the inclined floor plate 2a, in which the slit 5 is formed, on the lower side thereof, and is separated from the inclined floor plate 2a.A relatively narrow air passage 7 is formed between the two. The upper end of the air passage 7 opens into the dust box 8, and the lower end opens into the upper surface of a vibration gutter 9 for conveyance, which is installed in close proximity to the discharge port 4 of the hopper 1 and below the discharge port 4. ing.

The dust box 8 has an opening 10 at its upper end communicating with a dust collector (not shown), and a filter 11 such as punched metal or wire mesh is disposed in the center so as to divide the inside of the box into two. A discharge port 12 with a shutter is provided at the lower end.

When using the device according to the present invention, the dust collector connected to the dust box 8 is driven in advance,
It is necessary that the outside air be drawn relatively strongly into the upper dust box 8 through the air passage 7 below the inclined floor plate 2a of the hopper 1. In this state, when the gate 3 of the hopper is partially opened and a part of the steel shot inside is discharged to the outside, and the other steel shot 2 is fluidized toward the discharge port 4, most of the steel shot is discharged from the inclined floor plate. Enter slit 5 in 2a. As the steel shot 2 with molding sand that has entered this slit 5 moves downward, the slit width increases, so it passes through this in front of the slit 5 and falls, causing the inclined floor plate 2a and the wear-resistant steel plate 6 to fall. Enter the air passage between. At this time, the molding sand scraped away by the slit, the molding sand and flash separated by the collision between the steel shots in the hopper also fall from the slit 5 and enter the air passage 7. . In particular, cast burrs do not get caught because the slit 5 is wide on the downstream side. Since the steel shot 2 entering the air passage has a large mass, it is not affected by the suction force of the air and hits the wear-resistant steel plate 6 below, and is guided by the inclined surface of the steel plate 6 to form a vibrating gutter. 9 and is carried out together with the steel shot 2 discharged from the discharge port 4 of the hopper 1 for reuse. On the other hand, the molding sand and the like that have entered the air passage 7 are sucked by the air suction force from the dust collector, ascend the air passage 7, and enter the dust box 8, where they accumulate at the lower part of the filter 11. When a predetermined amount of this molding sand is stored in the box 8, the shutter of the discharge port 12 is opened and the molding sand is discharged to the outside.

<<Effects>> As described above, according to the device for separating molding sand from a casting backup shot according to the present invention, a plurality of slits can be formed here by utilizing the inclined floor plate facing the discharge port of the hopper 1. However, since air suction is applied to the steel shot that has fallen from the slit, and the molding sand and casting burrs are separated due to the difference in mass, there are virtually no parts that wear out, making it extremely economical. . Furthermore, since the portions where the steel shot, molding sand, etc. fall are formed long over the entire length of the slit, the air suction force can be effectively applied to these portions, thereby increasing the separation efficiency. Furthermore, since the width of the slit is wide at the bottom, clogging due to casting burrs etc. can be effectively prevented.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view schematically showing the device according to the invention, and FIG. 2 is a plan view showing a slit formed in the inclined floor material of the hopper of the device. 1...Hopper, 2...Steel shot, 2
a, 2b...slanted floor plate, 4...exhaust port, 5...slit, 7...air passage, 8...dust box.

Claims (1)

[Scope of utility model registration request] A plurality of slits are formed along the flow direction of the shot group in the inclined floor plate that descends toward the lower end outlet in the hopper that stores the steel shot group used for shell mold backup, and the slits are arranged in the flow direction. The width of the shot group is gradually increased as it moves to the hopper, so that a part of the shot group falls through the slit to the outside of the hopper, and below the slit, an air passage is formed at a spaced interval. 1. A device for separating mold sand from a foundry back-up station, characterized in that the device is connected to a suction dust box.