JPH0647235U - Powder quantitative supply device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an inexpensive device with a simple structure for stably and quantitatively supplying powder. [Structure] A porous plate (canvas 4) is obliquely provided at the bottom of a tank 1 and an outlet 5 provided with a rotary valve 6 is provided on the downward side, and air supply means (blower 7, electric heater 8) from below the canvas is provided. And a supply pipe 9).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for quantitatively supplying powder used in, for example, a fly ash solidifying device in a refuse incinerator.

[0002]

[Prior art]

 The above-mentioned fly ash solidification device is a device that mixes fly ash with water, cement, chemicals, etc. and solidifies it to render it harmless. There are two types of mixing: one is to weigh all the raw materials individually, then put them into a container, then mix and discharge for a certain period of time, and the other is a continuous system in which the raw materials are simultaneously supplied and mixed at a constant ratio. However, the application of the present application is the latter continuous type.

In the case of the continuous type, a device that continuously supplies the raw material in a constant amount is required. In particular, fly ash has fine particles and is apt to undergo a crosslinking phenomenon in the tank, and the bulk and specific gravity fluctuate greatly depending on the degree to which air is contained.

In the conventional apparatus shown in FIG. 5, a downward air nozzle 12 is provided in the middle of the hopper 11 of the tank 10, and blowing air from the nozzle 12 prevents cross-linking and allows fly ash to flow down. The weight of the fly ash discharged from the feeder 13 at the bottom of the hopper 11 is measured by the weighing machine 15 below the feeder 13, and the drive motor 14 of the feeder 13 is adjusted so that the weight becomes constant. Control the number of rotations.

[0005]

[Problems to be solved by the device]

 In the conventional apparatus, it is difficult to completely follow fluctuations in the bulk specific gravity and stably supply a fixed amount, and the structure is complicated and expensive.

An object of the present invention is to provide a powder quantitative supply device which is simple in structure and inexpensive in stable powder supply.

[0007]

[Means for Solving the Problems]

 According to the present invention, a porous plate is disposed at a bottom of a tank in an inclined manner, and a discharge port equipped with a rotary valve is disposed on a downwardly inclined side of the porous plate. Air supply means for supplying a predetermined amount of air from below is provided.

Further, the inclination angle of the porous plate body is preferably, for example, 5 ° to 7 °.

Further, it is preferable that the supply amount of air be such that the passing speed of the air through the porous plate body is, for example, 1 to 4 m / min.

The air supply means is composed of a blower and a supply pipe, and an electric heater is provided in the supply pipe to raise the temperature of the supply air to, for example, 60 ° C. or higher to prevent dew condensation in the tank. It is preferable to increase the fluidity to stabilize the supply.

[0011]

[Action]

 In the powder quantitative supply device configured as described above, the mixing ratio of the powder and the air immediately above the porous plate is equilibrated by the air passing through the porous plate. And the bulk specific gravity of the fly ash discharged becomes constant. Moreover, the air eliminates the phenomenon of cross-linking in the tank, and discharges smoothly. In addition, by controlling the rotational speed of the rotary valve, it is possible to stably supply a fixed amount without using a metering device.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 4, a chamber 3 is provided at the bottom of the hopper 2 of the tank 1. Inside the chamber 3, a porous plate body, that is, a canvas 4 is stretched at an inclination angle θ. A discharge port 5 having a lower opening is connected to a downwardly inclined side (left side in the drawing) of the canvas 4, and a rotary valve 6 is provided at the discharge port 5.

On the other hand, a supply pipe 9 from the blower 7 is opened at the bottom of the chamber 3, and an electric heater 8 is interposed in the supply pipe 9, and an air supply means is provided by these members 7 to 9. Is configured. Therefore, the campus 4 and the blower 7 form an air slide.

The inclination angle θ is preferably 5 ° to 15 °. Further, the passing speed of the air canvas 4 is preferably 1 to 4 m / min. Further, it is preferable to heat the air to 60 ° C. or higher by the electric heater 8.

Next, the operation will be described.

When the blower 7 and the rotary valve 6 are operated and a powder, that is, fly ash X in the illustrated example, is charged into the tank 1, the fly ash X falls through the hopper 2 and onto the canvas 4 in the chamber 3. . Then, the air that has passed through the canvas 4 equilibrates the mixing ratio of the fly ash X immediately above the canvas 4 and the air to be constant, and the bulk specific gravity is also constant. Further, the inflowing air prevents the fly ash X from bridging in the tank 1, and the fly ash X is smoothly discharged from the discharge port 5 by the rotary valve 6.

At this time, since the amount of fly ash X discharged is completely proportional to the rotational speed of the rotary valve 6, the fly ash can be discharged quantitatively by controlling the rotational speed of the rotary valve 6. Further, by heating the air to, for example, 60 ° C. by the electric heater 8, it is possible to prevent dew condensation in the tank 1, improve the fluidity, and stabilize the supply. According to the experiment, the fluctuation range of the emission amount when operating at a constant supply rate of this supply device was 1% or less in terms of weight.

[0019]

[Effect of device]

 Since the present invention is configured as described above, it is possible to stably and quantitatively supply even powder having a large variation in bulk specific gravity.

Further, the structure can be simplified and the cost can be reduced by eliminating the need for a weight measuring device.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a side sectional view of a main part.

FIG. 3 is a plan view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is a side sectional view showing a conventional device.

[Explanation of symbols]

 θ: Inclination angle of canvas 1, 10 ... Tank 2, 11 ... Hopper 3 ... Chamber 4 ... Canvas 5 ... Discharge port 6 ... Rotary valve 7 ... Blower 8・ ・ ・ Electric heater 9 ・ ・ ・ Supply pipe 12 ・ ・ ・ Air nozzle 13 ・ ・ ・ Supplier 14 ・ ・ ・ Drive motor 15 ・ ・ ・ Measuring machine

Claims (1)

[Scope of utility model registration request] 1. A tank is provided with an inclined porous plate at the bottom of the tank, an outlet provided with a rotary valve is provided on the lower inclined side of the porous plate, and the porous plate is provided below the porous plate. An apparatus for supplying a fixed amount of powder, characterized by comprising an air supply means for supplying a predetermined amount of air.