JPS5823793Y2 - Material discharge device in storage tank - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a material discharge device for a material storage tank installed in an asphalt plant or the like.

For example, in an asphalt plant, a storage tank is installed to store gravel used as an asphalt aggregate material. Normally, the wet material is put into the storage tank and taken out from the material outlet at the bottom of the storage tank. The processed material is supplied to a dryer, heated and dried, and then sent to the next process.

From this, in order to reduce the drying heating energy in the dryer, it is desirable that the material taken out from the storage tank be a material with as low a water content as possible.

However, as shown in Figure 1, conventional storage tanks of this type have
A material input port 1a is opened at the center of the upper lid of the storage tank 1, and a material discharge port 1b is opened at the center of the bottom of the storage tank 1. Directly below and near the discharge port 1b, there is a conveyor 2 for transferring the fallen material. It has a structure in which it is installed.

According to the storage tank 1 having such a conventional structure, when a new material is initially introduced, since the water permeability of the stored material M is good, the water adhering to the material can penetrate the gaps between the underlying materials. When the material M is discharged, the material from which water has been separated by the water permeation slides down the slope 3 having an angle of repose θ unique to the material and reaches the discharge port 1b.
The water content of the extracted material is thereby reduced.

However, after the storage time of material M has passed to a certain extent, the slope 3
The following dead stock materials have reduced water permeability due to clogging with fine aggregate;
The slope 3 becomes an impermeable surface similar to a concrete slope, and as a result, the moisture of the material that slides down the slope 3 during discharge is not separated on the way, and in other words, the material with the same moisture content as when it was input flows from the discharge port 1b. A problem occurs when the product is removed.

In addition, in the conventional structure described above, the volumetric efficiency of storage decreases due to the dead stock volume of slope 3 or less, and in order to increase the efficiency, it is necessary to provide discharge ports at multiple locations, and in order to increase the effective volume. However, there is a problem in that the storage tank must be made larger, and the cost of machinery and equipment and foundation work increases even if the tank collapses.

The present invention was developed in order to solve the above-mentioned problems. Namely, the purpose of the present invention is to create a storage tank that can always obtain discharged material with a low moisture content and that has good storage volume efficiency. An object of the present invention is to provide a material discharge device.

Hereinafter, the present invention will be explained based on an illustrated embodiment.

In the discharge device of the embodiment, as shown in FIGS. 2 and 3, a material input port 5 and a material discharge port 6 similar to the conventional structure described above are provided at the center of the upper lid 4a and bottom portion 4b of the storage tank 4. A conveyor 7, such as a belt conveyor or an apron conveyor, is provided immediately below and near the discharge port 6.

Furthermore, a pair of drain gutters 8 are provided symmetrically on the bottom 4b of the storage tank, and the inner end of the drain gutters 8 connects to the material outlet 6.
The outer end penetrates the side wall of the outer periphery of the storage tank 19 and projects outside the tank, and a drainage slope is provided toward the outside of the tank.

Further, a material conduit 9 and a drainage passage 1.0 are provided at the inner end and outer end of the bottom of the drain gutter 8, respectively, and the material conduit 9 is connected to the material outlet toward the upper part of the discharge port 6. 9a is open, and the drain passage 10 has a drain port 10a opening toward a drain groove (not shown) outside the tank, and the upper surface of the inside of the tank of the drain gutter 8 is cut off. It forms a material inflow opening 11.

Therefore, a screw feeder 12 is installed in the inner hole of the drainage gutter 8.
A chain 15 is hooked between the sprocket 13, which is fixed to the external force protrusion of the rotary shaft 12a, and a drive motor 14 attached to the drain gutter 8.

In addition, the material inlet opening 11 of the drain gutter 8 is formed in the form of a roof plate, which is spanned between the side wall of the tank 4 and the bracket 16 of the drain gutter 8, and is spaced apart from the upper surface of the drain gutter 8. is covered by a baffle plate 11.

Next, the operation of the discharge device of the embodiment configured as above will be explained.

First, when storing materials, water-wet materials are fed into the storage tank 4 from the input port 5. At this time, the screw feeder 1
Since the feeder 2 is protected by the baffle plate 17 covering the top thereof, there is no risk that the feeder 12 will be damaged by material collision.

By the way, since the stored material M is discharged through the discharge gutter 8 by the operation described later, a small amount of the material M located below the slope 18 (FIG. 3) forming an angle of repose θ with respect to the material inlet opening 11 is Only the material becomes dead stock, and therefore, the moisture adhering to the material M above the slope 18 passes through the lower layer that does not cause clogging, and then flows into the drain gutter 8 along the slope 18, and further, Due to the drainage slope of the drainage gutter 8, the water is discharged to the outside through the drainage passage 10.

, then when the material is discharged, the feeder 12 is operated by the motor 14.
At the same time, the conveyor 7 is driven by a motor (not shown) and rotates to the right in the drawing.

The material that has flowed into the drain gutter 8 through the space between the baffle plate 11 and the slope 18 enters the discharge port 6 via the material conduit 9 due to the upward movement of the feeder 12, and then falls onto the conveyor 7. After being transported, it is continuously supplied to the required location.

In addition, since the material discharged by this operation is drained before entering the drain gutter 8 as described above, its water content is sufficiently reduced.

In addition, in the structure of the above-described embodiment, the dead stock volume under the slope 18 is extremely small, so that the storage volume efficiency is close to the maximum value.

It goes without saying that the drain gutter 8 may have a receiving gutter shape or a pipe shape.

Further, in order to improve drainage performance, the screw installed in the drain gutter 8 may be provided with helical blades intermittently or may be provided with pores in the helical blade.

As described above, according to the material discharging device for a storage tank according to the present invention, the stored material is allowed to flow into the material discharge port via the drain gutter equipped with a fieger, and the drain slope attached to the drain gutter is Since the structure is designed to effectively drain separated water from the drain outlet outside the storage tank, the same drainage performance as with fixed drainage equipment can be obtained, and materials with a low moisture content can be constantly discharged. This not only saves energy during the next process of drying and heating, but also improves the economic efficiency of storage tanks by reducing equipment costs due to the high storage volume efficiency.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a conventional material discharge device for a storage tank, FIG. 2 is a schematic diagram of a material discharge device for a storage tank showing an embodiment of the present invention, and FIG. FIG. M...Material, 4...Storage tank, 4b...
... Bottom, 6 ... Material discharge port, 8 ... Drain gutter, 10 ... Drain passage, 11 ... Material inflow opening, 12. ·····feeder.

Claims (1)

[Scope of utility model registration request] A drainage gradient is formed in the direction of the outer circumferential position between a location directly above the material discharge port opened at the bottom of the storage tank and the outer circumferential position of the storage tank, and the material discharge port is connected to the inner end side. A drainage gutter having a material dispensing port opening toward the storage tank and a drain opening opening to the outside of the storage tank on the outer end side, and a feeder installed in the inner hole of the drainage gutter and operated in the upward direction,
A material discharge device for a storage tank, characterized in that the stored material is discharged from the discharge port by the operation of the feeder, and moisture in the material is drained out of the storage tank along the discharge gutter.