JPS6212138B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a powder discharge device.

Conventional devices of this type include, for example, one in which a worker valve is attached to the outlet of a tank containing powder on its horizontal surface, similar to a camera shutter; There are known methods that include a resistor plate that can be moved up and down, or a measuring machine called a rotary box installed at the discharge port. It was difficult to control. Moreover, there were also problems such as maintenance problems and increased installation costs.

This invention features a resistor that has an umbrella-shaped top and a cylindrical fixed skirt, which prevents the bridging phenomenon that tends to occur when powder and granules are discharged from a tank outlet, and a movable skirt that can be moved up and down. In addition, a measuring device for detecting the impact force of the falling flow of powder and granular material is installed at the discharge port, and the amount of vertical movement of the movable skirt can be controlled according to the detected amount of discharge. It is.

The invention will be explained in detail below with reference to illustrated embodiments.

FIG. 1 is a diagram showing a first embodiment of the present invention. Reference numeral 1 denotes powder or granular material, which is stored in an appropriate amount in the tank 2 and discharged from the tank 2 through the discharge port 3.
A resistor 4, a movable skirt 5, and a measuring device 6 are mainly attached to the discharge port 3. The resistor 4 has an umbrella-shaped top and a cylindrical fixed skirt, and is fixed within the discharge port 3 via an arm 7 with its top 8 facing upward. A servo motor 1 as an actuator is installed in the internal space of the fixed skirt 9.
0 is provided, and the movable skirt 5 disposed in sliding contact with the inside of the fixed skirt 9 is made vertically movable.
The "actuator" is not limited to the servo motor 10, but may be any other type as long as its operation can be controlled freely. A powder discharge path 11 is formed between the resistor 4 and the inner wall of the inverted conical discharge port 3, and the movable skirt 5 faces this powder discharge path 11.
The gap amount of the discharge passage 11 is freely adjustable. The measuring device 6 is located at the discharge port 3 and consists of an umbrella-shaped plate 12 that receives the impact force of the falling flow 1a of the powder and granular material 1, and a measuring device main body 13 connected to this plate 12. For example, a strain meter such as a load cell is adopted, and the discharge amount is detected in a stepless manner depending on the magnitude of the impact force of the falling flow 1a. is for controlling the amount of vertical movement of the movable skirt 5.

Next, the action will be explained. The basic function of this granular material discharge device is that the umbrella-shaped top 8 of the resistor 4 prevents the bridging phenomenon that tends to occur in the granular material 1 because the outlet 3 of the tank 2 has an inverted conical shape. The flow rate of the smooth falling flow 1a of the powder and granular material 1 is controlled under various conditions (for example, particle size, particle shape, physical properties, etc.). The fluidity of the powder 1 changes depending on the temperature, humidity, etc., and is regulated by the gap in the discharge path 11, which is adjusted by the vertical movement of the movable skirt 5. A desired amount of powder 1 is transferred to tank 2.
It is to be discharged from More specifically, by interlocking the movable skirt 5 and the measuring device 6, the reference impact value of the falling flow 1a corresponding to the desired discharge amount set in advance and the flow characteristics of the powder and granular material 1 at that point are determined. Accordingly, the deviation from the impact value of the falling flow 1a actually received by the measuring device 6 is fed back to the movable skirt 5, and the movable skirt 5 is moved up and down to adjust the gap amount of the discharge path 11. By using the umbrella-shaped plate 12 as the "measuring section" of the measurement quantity 6, stagnation of the falling flow 1a in the "measuring section" is prevented, and the falling impact value of the falling flow 1a can be measured more accurately. Furthermore, by providing the movable skirt 5 in sliding contact with the inside of the fixed skirt 9, it is possible to prevent the granular material 1 from entering the inside of the movable skirt 5, and to use the inside of the movable skirt 5 for driving the movable skirt 5. This provides an empty space for installing the servo motor 10, thereby achieving miniaturization of the device.

In addition, 14 in the figure is a frame for attaching the measuring instrument 6 to the tank 2.

FIG. 2 is a diagram showing a second embodiment of the invention. In this embodiment, a pressure cylinder 16 and a pandagraph-shaped link 17 are employed as actuators for vertically moving the movable skirt 15, and a measuring instrument main body 18 is attached to an appropriate fixed part 19. This is almost the same as the example. In the figure, 20 is a roller, 21 is a guide, and 22 is a fixed point.

To explain the operation, the pressure cylinder 16 is actuated according to the impact force of the falling flow 1a measured by the measuring device main body 18, and the discharge amount is adjusted by moving the movable skirt 15 up and down via the link 17. In this example, pressure cylinder 1 is shown as arrow A.
6, the roller 20 moves on the guide 21 as shown by arrow B, and the movable skirt 15 moves upward as shown by arrow C. The other configurations and functions are almost the same as in the previous embodiment.
Identical parts in the drawings are designated by the same reference numerals, and redundant explanation will be omitted.

Since the powder discharge device according to the present invention is as described above, (a) the umbrella-shaped top of the resistor effectively prevents the bridging phenomenon and smoothes the falling flow of the powder discharged; (b) Furthermore, the falling impact force can be detected without causing any stagnation in the smooth falling flow of powder or granules by using a measuring device with an umbrella-shaped plate installed at the bottom of the discharge port. , it is possible to continuously, constantly and accurately detect and monitor the discharge amount of powder and granular material, and (c) this measuring device is linked with a movable skirt for adjusting the gap amount of the powder and granular material discharge path. As a result, the continuous, uniform and quantitative discharge of powder and granules can be carried out accurately and easily. It has the excellent effect of being able to continuously discharge a large amount of powder and granules with high precision. By installing it in sliding contact with the inside of the skirt, there is a space inside the movable skirt to house the main parts of the drive mechanism of the movable skirt, which has the excellent effect of making the entire device smaller accordingly. It is something.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the vicinity of a tank outlet showing one embodiment of the present invention, and FIG. 2 is a sectional view similar to FIG. 1 showing another embodiment. 1... Powder, 1a... Falling flow, 2... Tank, 3... Outlet, 4... Resistor, 5, 15...
Movable skirt, 6... Measuring instrument, 10... Servo motor, 17... Link.

Claims (1)

[Scope of Claims] 1. A resistor having an umbrella-shaped top and a cylindrical fixed skirt that prevents the bridging phenomenon of powder and granules above an inverted conical discharge port of a tank for storing powder and granules. A movable skirt is disposed below the resistor with its top facing upward, and is movable up and down to adjust the gap between the resistor and the inner wall of the discharge port. A measuring device is provided in sliding contact with the inside of the stationary skirt, and has an umbrella-shaped plate at the discharge port to detect the impact force of the falling flow of powder and granules, and the movable device is linked to the measured value of this measuring device. A powder discharge device that allows the vertical movement of the skirt to be controlled.