JPS58216519A - Method of filling powdered and granular body - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for filling powder or granular material, in particular, uses a powder or granular material discharge nozzle with an open bottom end to fill a bag or container with powder or granular material. By controlling the relative distance between the powder and granules discharged and deposited on the discharge nozzle tip, it is possible to prevent dust from flying up and worsening the working environment, or conversely, the nozzle tip becoming buried in the discharged and deposited powder and granules. The present invention relates to a method that prevents granular material from being crowded and hinders smooth filling, and which allows powder and granular material to be filled in a good condition at all times.

When transferring and filling various inorganic powders such as soda ash and magnesium carbonate, and powders such as flour and rice from hoppers to bags and containers, dust often flies up and pollutes the working environment. You may experience a phenomenon where you lose money due to deterioration or scattering. Generally, this is because the relative distance between the discharged and deposited powder and the discharge nozzle provided in a hopper or the like is large, so that dust rises up from there. In order to prevent this, it is desirable to reduce the relative distance between the discharged and deposited powder and the discharge nozzle as much as possible, but it is difficult or undesirable to do this manually from both technical and occupational health standpoints. do not have. It is also possible to begin filling by burying the tip of the discharge nozzle in advance to some extent in the discharged and deposited powder. As a result, the particles become deeply buried inside the nozzle, resulting in the same phenomenon as clogging of the powder or granular material in the nozzle, resulting in a problem in smooth filling of the powder or granular material.

In view of this, the inventor of the present invention sought to find a means that allows for smooth filling at all times in response to the ever-changing amount of powder and granules being discharged and deposited, and that also suppresses the phenomenon of dust flying up as much as possible. As a result of our own investigation and study for the purpose of The receiver detects that the amount of particles present between the transmitter and the receiver changes due to the presence or absence or amount of powder present between the transmitter and the receiver, and based on this, the relationship between the discharged and deposited powder and the discharge nozzle is detected. By controlling the relative distance, the above object is achieved, and this is the gist of the present invention. In the present invention, the tip of the powder discharge nozzle provided with the wave transmitter literally has a tip cut portion and a tip end. You can choose from the cut part to any upper part.

However, it is better to avoid setting the upper limit to a place where the inside of the removal nozzle, where the nozzle is buried in discharged deposits, becomes clogged and filling of the required amount is no longer possible. In addition, when providing the transmitter at the tip of the nozzle, it is possible to provide the transmitter so as to protrude beyond the cut at the tip of the nozzle. If the distance is too large, dust will fly up from there, so it is necessary to pay attention to the distance.

The wave transfer device is installed so that the oscillated wave from it crosses the space inside the powder discharge nozzle and reaches the opposing nozzle tip, and a wave receiver receives the arriving wave. Therefore, the position where the wave receiver is installed does not necessarily have to be strictly at the nozzle part facing the wave transmitter.

As the transmitter used in the present invention, for example, an ultrasonic vibrator, a phototube, a laser oscillator, etc. can be selected and used depending on the type and properties of the powder and granules, and each receiver corresponds to the transmitter. Any known method can be used.

In actual use, it is possible to take the divine mode, but for example, when powder or granules are normally falling through the nozzle, the count on the receiver side should be set to an appropriate value, such as 0 or 5. , when the tip of the ejected and deposited powder particles begins to exist between the wave transmitting and receiving parts, the count increases rapidly, or by reversing these series of relationships, or any other suitable detection form may be adopted.

Furthermore, as an application aspect of the present invention, when a phenomenon such as load collapse occurs and a relative distance suddenly occurs between the accumulated powder and the discharge nozzle, if this condition continues for a certain period of time, the nozzle lowering operation is started by setting a timer. This makes it possible to deal with some troubles, such as incorporating a system that can maintain the nozzle at an appropriate level at all times.

In this way, when the method of the present invention is adopted and the detection mode is adopted, when the tip of the ejected and deposited powder receives a signal existing between the wave transmitting and receiving parts, the ejecting nozzle is automatically adjusted to a certain level...
] A combination of known mechanisms, such as a stepping motor, can be employed to raise the distance. By repeating the detection and nozzle lifting in this manner, the powder can be filled without generating dust. Note that control of the filling amount is not intended by the present invention.

Next, the present invention will be explained by examples.

Soda ash with an average particle diameter of 3 μm was placed in a hopper with a capacity if Otf, and the present invention was applied in the following manner when transferring this to a container from a discharge nozzle with an internal diameter of 45 μm provided at the bottom of the hopper.

Ultrasonic transducers were provided at 20 locations from the distal end of the discharge nozzle, and their wave receivers were provided at nozzle positions facing each other across the nozzle. The vibrator then oscillates a vibration wave with a wavelength of 1.5 times, and the soda ash from inside the hopper is filled into the container. Set. Then, filling the container with soda ash was started with the leading end of the discharge nozzle in contact with the inner bottom of the container. Shortly after the start, the count suddenly increased to 9, and the oscillation wave was completely blocked by the soda ash discharged and deposited inside the container, and was no longer detected by the receiver. In response to this, the solenoid valve was activated and the motor for raising the discharge nozzle was rotated, so that the nozzle was raised by 5 cm, and filling with soda ash was continued. The nozzle was raised 28 times to complete the filling of the container with soda ash, but during this period, virtually no dust was thrown up.

Claims (1)

[Claims] 1. A wave transmitter is provided at the tip of a powder discharge nozzle, and a wave receiver is provided at the opposing tip of the nozzle, and the oscillation waves oscillated from the wave transmitter are transmitted to the wave transmitter. The receiver detects the presence or absence of powder or granular material present between the receiver and the receiver, and the position of the ejected and deposited powder and the discharge nozzle is controlled based on this. A method for filling powder and granular materials. 2. Transmitter type ultrasonic transducer, phototube, range of h ~ (su method).