JPS64141B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sand outlet device for a foundry sand recycling facility that continuously recycles foundry sand.

The foundry sand used in casting is usually treated so that it can be reused, and the sand temperature is adjusted to an appropriate temperature in the final stage of the treatment process.

The sand temperature is adjusted in a sand tank 1, an example of which is shown in a vertical cross-sectional view of the bottom in FIG.

A heat exchanger 2 with fins is installed in the sand tank 1.
The bottom of this sand tank 1 is formed with a hopper-shaped sand outlet device A.

As shown in FIG. 1, the conventional sand outlet device A is a device that can take out the treated molding sand 5 from the lower end upper part 4 of the hopper-like main body 3. is a horizontally movable plate-shaped shutter 6
It is closed and opened when removing sand.

On the other hand, a canopy-shaped baffle plate 7 is provided in the upper and lower intermediate parts of the main body 3, so that the sand in the main body 3 is spread and falls evenly.

Further, a uniform dropping device B consisting of a fixed perforated plate 8 and a movable perforated plate 9 is provided between the sand tank 1 and the sand outlet device A, and the processed molding sand 5 adjusted to an appropriate temperature is poured into the sand. The dispersion within the outlet device A is as uniform as possible.

The shutter 6 and the movable perforated plate 9 are driven by dedicated cylinders 10 and 11, respectively.

The conventional sand outlet device A having the above structure is as follows:
Theoretically, by operating the movable perforated plate 9 from the sand tank 1, the treated foundry sand 5 should be supplied almost evenly, but the entire load of the foundry sand 5 in the sand tank 1 is not received. a movable perforated plate 9 that moves horizontally in the part where the
Even if the holes 9A and 8A of the fixed perforated plate 8 match, the molding sand 5 is solid and actually falls extremely unevenly.

Furthermore, the molding sand 5 that has entered the main body 3 is spread toward the side wall 3A by the baffle plate 7 only when the upper side from the baffle plate 7 is empty, and only when the shutter 6 is closed. When the molding sand 5 is supplied into the main body 3 and there is almost no gap above and below the baffle plate 7, the molding sand 5 is supplied into the main body 3 from the upper end of the main body 3 to the lower end opening 4.
Considering that the horizontal cross-sectional area decreases as it reaches , the lower part of the main body 3 is subjected to extremely large lateral pressure, and the molding sand 5 may not fall smoothly even if the shutter 6 is opened. .

In addition, the shutter 6 is a single plate, and the amount of sand taken out can be adjusted by changing the opening degree.
In reality, when the lower end opening 4 is left half-open, the molding sand 5 directly above the open part simply falls, and of course it is impossible to take out the sand in proportion to the opening. Most of the foundry sand 5 often remains inside the main body 3.

Based on the above-mentioned viewpoints, the present invention provides a sand outlet device for molding sand regeneration equipment that can solve the above-mentioned problems. The inside of the hopper-shaped body constituting the bottom of the hopper-shaped sand tank is divided into a plurality of vertical through passages by a predetermined partition wall, and the lower end of the discharge port at the bottom of the hopper-shaped body has a plurality of sand passage holes of a predetermined diameter. It is characterized in that a horizontally movable perforated shutter is brought into contact with the shutter, and a fixed gate plate having a plurality of sand passage holes of a predetermined diameter is attached to the underside of the shutter.

Next, the apparatus of the present invention will be explained by way of embodiments with reference to the drawings.

FIG. 2 shows an embodiment of the device according to the invention in a plan view, and FIG. 3 shows a longitudinal sectional front view. As shown in the drawings, the apparatus C of the present invention includes a hopper-shaped main body 1 constituting the bottom of a sand tank 1 that accommodates foundry sand and is provided with a heat exchanger 2 for adjusting the sand temperature to an appropriate temperature.
2 has a rectangular hopper shape, and the interior is divided into 16 vertical passages D by partition walls 13 in a square lattice shape at the upper end.

Note that the 16 vertical through passages D are just an example, and depending on the formation of the partition walls, an even number or an odd number may be used.
In the case of a hopper shape with a circular cross section, the vertical through passages are arranged in a shape other than a lattice, for example, in a concentric circular arrangement, and the vertical through passages except for the central one have a fan-shaped cross section.

The lower end of each vertical passage D communicates with the rectifying passage E of the discharge port 14, respectively.

The discharge port 14 has, for example, upright partition walls 15 formed in a lattice shape similar to the partition walls 13 in the main body 12, thereby forming the same number of rectifying channels E with which the vertical passages D communicate directly with each other. Note that the discharge port 14 is
A simple cylindrical shape may be used without providing the partition wall 13 and the rectifying path E as described above.

The lower end of the discharge port 14 is abutted with a perforated shutter 17 in which a plurality of sand passage holes 16 of a predetermined diameter are bored in an arrangement as shown in a plan view in FIG.

The perforated shutter 17 is movable horizontally by the cylinder 18, and one extreme of its stroke is located directly below the discharge port 14.
Adjustment screw 2 supported on bracket 19 integrated with
Stoppers 21 and 21 that come into contact with 0 and 20 make it possible to stop at any position, ie, at the half-open position shown in the enlarged longitudinal sectional view in FIG. 5, and other positions.

The stoppers 21, 21 are fixed to the perforated shutter 17, and the adjusting screws 20, 20 are fixed to the bracket 1.
9, the screwing depth can be adjusted freely.

On the other hand, a fixed gate plate 22 is provided at the bottom of the discharge port 14.
The perforated shutter 17 moves horizontally between the lower end of the discharge port 14 and the lower end opening 23.

The fixed gate plate 22 has a plurality of sand passing holes 24 that are the same in number as the sand passing holes 16 of the above-mentioned perforated shutter 17 facing directly below the flow straightening path E, and each sand passing hole 24 has the same number as the sand passing holes 16. It is the diameter.

In the apparatus of the present invention configured as described above, the treated foundry sand 5 whose temperature has been adjusted in the sand tank 1 (see FIG. 1) equipped with the heat exchanger 2 is directly fed into the main body 12 from the sand tank 1. They come in one after another.

At this time, the foundry sand 5 enters each vertical passage D and reaches the discharge port 14. The rectifying path E provided at the discharge port 14 rectifies the foundry sand 5 that descends with an oblique motion component in the vertical passage D of the main body 12, and provides inertia to cause it to fall directly downward.
In this way, the foundry sand 5 that has entered the discharge port 14
6, the perforated shutter 17 is moved horizontally by the drive of the cylinder 18, and the sand passage hole 24 of the fixed gate plate 22 is partially shown in an enlarged sectional view in FIG.
When the sand passing hole 16 is completely facing upward, the sand can be taken out at the maximum flow rate.

In addition, when the sand passage hole 16 is partially opposed to the sand passage hole 24 as shown in the partially enlarged sectional view in FIG. The molding sand 5 is taken out at a flow rate corresponding to the opening area. The flow rate adjustment is performed using a perforated shutter 17.
This is done by adjusting the extreme position of .

In the embodiment described above, the discharge port 14 is provided with a flow rectification path for performing a flow rectification action, but as described above, such a flow straightening path is not necessarily required and the discharge port 14 may be formed into a simple cylindrical shape. It is.

As is clear from the above description, the device of the present invention can take out the molding sand passing through the main body while minimizing the lateral pressure acting on it, and can give the molding sand the inertia to fall evenly. By adjusting the amount of overlap between the sand holes in the shutter and the fixed gate plate, an excellent effect can be achieved in which the amount of evenly falling molding sand can be precisely and finely adjusted.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an example of a conventional device, FIG. 2 is a plan view showing an embodiment of the device of the present invention, FIG. 3 is a longitudinal sectional view, and FIG. 4 is a plan view of a perforated shutter. FIG. 5 is an enlarged vertical cross-sectional view showing the arrangement of the rectifier tube, perforated shutter, and fixed gate plate, and FIGS. 6 and 7 are explanatory diagrams showing changes in the flow rate of molding sand. In the drawings, C... device of the present invention, 1... sand tank, 2... heat exchanger, 5... foundry sand, 12... main body, 13...
Bulkhead, 14... Discharge port, 15... Bulkhead, 16...
Sand hole, 17...Perforated shutter, 18...Cylinder, 19...Bracket, 20...Adjustment screw,
21...Stopper, 22...Fixed gate plate, 23
...lower end opening, 24...sand passage hole, D...vertical through passage, E...straightening passage.

Claims (1)

[Claims] 1. The inside of the hopper-shaped body constituting the bottom of the sand tank, which accommodates foundry sand and is equipped with a heat exchanger for adjusting the sand temperature to an appropriate temperature, is divided into a plurality of vertical through passages by predetermined partition walls, and the hopper A discharge port is provided at the bottom of the shaped main body, and a perforated shutter having a plurality of sand passage holes of a predetermined diameter and capable of stroke adjustment and horizontal movement is brought into contact with the lower end of the discharge port, and at the bottom of this shutter, A fixed gate plate is attached having a plurality of sand passage holes of the same number and diameter as the sand passage holes of the perforated shutter, thereby allowing the foundry sand contained in the sand tank to fall evenly. Sand outlet device for foundry sand reclamation equipment.