JPS61183021A - Delivery control method for powdery material - Google Patents

Abstract

PURPOSE:To enable delivery of powdery material to be accurately controlled by setting a horizontal conveyor just beneath a discharge outlet of a tank with a certain space apart from the outlet when the conveyor is at rest so as to enable the powdery material to stay forming an angle of repose between the discharge outlet and the conveyor. CONSTITUTION:When a belt conveyor 10 is at rest in a conveyor powdery material 3 stays forming an angle of repose between a discharge outlet 5 and the conveyor. This configuration prevents the powdery material 3 from naturally falling down which is followed by its flow-out from an outlet 5 of a tempering tank 1. However, when the conveyor once starts out of this statical condition. The powdery material 3 that stays there forming the angle of repose is conveyed in succession. This cause the quantity of the powdery material 3 equivalent to the quantity transferred to fall down and to be delivered in succession. Accordingly, it is relatively simple to control the conveyor so as to regulate accurately discharge of the powdery material 3 in the tank by merely controlling the quantity of the powdery material 3 to be transferred. This configuration enables delivery of the powdery material 3 to be controlled as desired.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for controlling the discharge amount of powder and granular material that uses a conveying device to control the discharge amount of powder and granular material stored inside a tank.

<Conventional technology> Conventionally, when the powder and granular material stored inside a tank is discharged by gravity from the discharge port provided at the bottom of the tank, the discharge amount is controlled by installing an "opening/closing shaft" or the like at the discharge port. It has been common practice to provide a "damper" or the like that opens and closes the discharge port by moving in parallel, and controls the discharge port by adjusting the degree of opening and closing of the damper.

<Problems to be Solved by the Invention> However, in recent years, it has become increasingly common for tanks storing powder and granular materials to be used in combination with other processing equipment as a single unit on a series of processing process lines. For example, in a "conditioning tank" for adding water to rice grains,
JP-A-58-36647, JP-A-58-4005
As shown in Publication No. 5, etc., "rice milling equipment" and "
Since it is used in combination with a "sorting device" in a series of processing lines, the control of the discharge amount in the "refining tank" has a large effect on the flow of the entire processing line.

Therefore, it is possible not only to simply change the rough proportion of the amount of powder and granular material discharged, but also to accurately and freely control the amount of powder and granular material discharged even while it is being discharged. It has become necessary to be able to respond quickly.

However, the conventional control method using opening/closing shutters and dampers as explained above is difficult to meet the demands of the times, so it is difficult to meet the demands of the times as described above. There is a growing need for a method for controlling the amount of powder and granular material discharged.

<Means for Solving the Problems> This invention has been made with attention to the demands of the times as described above, and it does not require any special complicated control mechanism or the like, and it uses the conventional conveying device and powder particles. This was invented by taking advantage of the property of bodies to form an "angle of repose." Specifically, the powder and granules stored inside the tank are placed almost directly below the outlet from which the powder and granules stored in the tank are discharged by gravity. A conveying device that conveys horizontally is placed close enough that the powder and granules can remain at an angle of repose between the discharge port and the conveying device when the conveying device is stopped, and the conveyance amount when the conveying device is in operation is The amount of powder and granular material discharged will be controlled accordingly.

Function> When the conveyance device is stopped, the powder and granules remain at an angle of repose between the conveyance device and the discharge port, so the powder and granules naturally flow down and are discharged from the outlet of the tempering tank. It never gets put away. Once the conveyance device starts operating from this stopped state, the conveyance device conveys the accumulated powder and granules one after another at an angle of repose, so that the same amount of powder and granules as the conveyance amount flow down one after another. It is being expelled. Therefore, by simply controlling the transport amount of the transport device, which is relatively simple and accurate, it is possible to stop discharging the powder and granular material inside the tank, and the amount of powder and granular material discharged from the tank can be stopped. can also be controlled freely.

Practical Example> Below, as an example of the present invention, "
An example of a tempering device that performs water addition treatment on rice grains as granular material will be explained based on the drawings.

Rice grains 3 are successively introduced into the tempering tank 1 from an upper inlet 4 from a rice milling machine 2 installed separately and stored therein. A discharge port 5 is provided at the bottom of the tempering tank 1 to allow the rice grains 3 to flow down and be discharged, and this discharge port 5 is equipped with a damper 6 that opens and closes the discharge port 5 by moving in parallel. Reference numeral 7 denotes an aerosol generator that supplies aerosolized moisture into the tempering tank 1 along with air.

Furthermore, this aerosol is drawn downward by the air suction section 8 provided below the tempering tank 1, so that it is distributed throughout the tempering tank 1 from top to bottom, and the rice grains 3 are subjected to hydration treatment. . Furthermore, 9 is a second level needle that detects the upper limit of the rice grains 3 and sends a signal to start the operation of the aerosol generator 7 and a belt conveyor 10, which will be described later. Conversely, the lower limit of the rice grains 3 is detected and a signal is sent to stop the operation of the aerosol generator 7 and belt conveyor 10.

A belt conveyor 10 serving as a "conveying device" is horizontally disposed directly below the discharge port 5 of the refining tank 1 at a distance l. This distance l is the distance at which the rice grains 3 to be discharged can stay between the discharge port 5 and the belt conveyor 10 with an angle of repose θ, and if it is too large, the rice grains 3
does not form an angle of repose θ, so it does not stay and is all discharged from the discharge port 5. The belt conveyor 10 also includes a belt 12 that directly places and conveys the rice grains 3 that have been rotated and discharged, a motor 13 that rotates this belt 12, and an inverter 1 that controls the rotation of this motor 13.
It is mainly composed of 4.

Next, the action will be explained. When rice grains 3 are fed into the tempering tank 1 one after another from the rice polishing machine 2 with the damper 6 of the discharge port 5 opened in advance, the rice grains 3 that were fed first will be discharged as is well known. It begins to accumulate in a mountain shape on the belt 12 directly below the outlet 5 with an angle of repose θ. When the top surface of the rice grains 3 that have started to accumulate comes into contact with the discharge port 5, the discharge port 5 is closed, and the portion that has been deposited in a mountain shape until now stops further depositing, and from then on, the rice grains continue to be tempered. It is stored inside tank 1 [see Figure 1].

When the surface portion 15 of the stored rice grains 3 reaches the upper limit of the No. 1 Rubel meter 9, the No. 1 Rubel meter 9 sends a signal to start the operation of the aerosol generator 7 and the belt conveyor 10. The rice grains 3 deposited directly below the outlet 5 with an angle of repose e are conveyed in the direction of arrow A by the belt conveyor 10.
The amount of paper transported by the paper is sequentially discharged from the discharge port 5 onto the belt 12 (see FIG. 2). The conveyance amount of the belt conveyor 10 at this time is only slightly larger than the amount of rice grains 3 inputted from the rice milling machine 2, so that the surface portion 15 of the rice grains 3 descends in the tempering tank 1 little by little. rice grains 3
In this way, the aerosol supplied into the tempering tank 1 by the aerosol generator 7 is subjected to hydration treatment before flowing down and being discharged from the upper part to the lower discharge port 5. When the surface part 15 of the rice grain 3 falls to the position of the second level meter 11, the second level meter 1
The aerosol generator 7 and the belt conveyor 10 are stopped by the signal from 1, and the rice grains 3 begin to be stored again up to the upper limit of the level 9. While this storage continues, the belt conveyor 10 is stopped, and as explained above, the rice grains 3 immediately stay under the discharge port 5 with an angle of repose θ, so even if the damper 6 is not closed, it is difficult to quality tank l
It is not the case that all the rice grains 3 inside are discharged by gravity. In addition, since the conveyance amount of the belt conveyor 10, that is, the rotational speed of the belt 12 can be controlled accurately and easily by operating the connected inverter 14, even if the overall processing process is changed, the amount of rice grains 3 input from the rice milling machine 2 may be changed. Even if there is a change in the rice grain size, the rice grains will be
It is possible to easily control the discharge amount of rice grains 3, and a good water addition process can be performed with the rice grains 3 always stored in the tempering tank 1. Incidentally, the damper 6 may be opened and closed at the beginning and end, and the amount of rice grains 3 to be discharged is controlled by the belt conveyor 10 alone without operating the damper 6 or other parts during the processing process.

In addition, in the above explanation, the belt conveyor 1 is used as a "conveying device".
0 is shown as an example, but the invention is not limited to this, and may be a chain conveyor that can convey powder or granular materials, a vibration conveyor that can control the frequency by frequency conversion, an electromagnetic feeder, or other conveyors. The "grain" is not limited to rice grains 3 or grains, but any powder or granule can be controlled as long as it can form an angle of repose θ depending on the type of the powder or granule.

<Effects> Since the method for controlling the discharge amount of powder and granular material according to the present invention has the content as explained above, it is possible to control the amount of powder and granular material stored in a tank without using any particularly complicated mechanism or device. Since the amount of discharge can be controlled accurately and easily, there is an advantage that it is possible to quickly respond to the operating conditions of other combined devices. Furthermore, since a conventionally known conveying device is used, no special effort or cost is required for implementation, and the method is versatile in that it can be applied to all powders and granules that can form an angle of repose.

[Brief explanation of drawings]

FIG. 1 is a schematic view of the tempering device when the belt conveyor is stopped, showing an embodiment of the present invention, and FIG. 2 is a schematic view of the milk in the first phase showing the state when the belt conveyor is in operation. 1-・-・ Tempering tank 3-・ Rice grains [powdered material] 5- Discharge port 10 ・-・ Belt conveyor [conveyance scale θ −・− Angle of repose Fig. 1 Fig. 2

Claims (1)

[Claims] A conveyance device that conveys the powder and granules almost horizontally is placed directly below the discharge port from which the powder and granules stored inside the tank are discharged by gravity. The amount of powder and granular material discharged is characterized in that the powder and granular material are disposed close to each other at a distance that allows the powder and granular material to remain at an angle of repose between the two, and the amount of powder and granular material discharged is controlled according to the amount of transportation when the transportation device is operated. Control method.