JPH0350073Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a funnel-shaped hopper for storing and appropriately supplying granular materials such as metal powder.

[Prior art and its problems] Generally, in order to prevent powder from clogging the hopper and preventing smooth outflow, a vibrator for applying mechanical vibration is fixed to the outer surface of the peripheral side wall of the hopper. By vibrating the peripheral side wall, the cross-linked state of the powder in the hopper is eliminated and its outflow is made smooth. However, the hopper in which the vibrator is fixedly attached to the circumferential wall has a problem in that it tends to break in a short period of time due to metal fatigue caused by the vibration of the circumferential wall, resulting in poor durability.

[Means for Solving the Problems] The present invention aims to solve the above-mentioned drawbacks by providing an opening in a part of the circumferential wall of a funnel-shaped hopper, and fixing a cylindrical resonance tube in the opening. , a hopper for supplying powder and granular material, characterized in that a sound generator is provided at the tip of the resonance tube to vibrate an air column in the resonance tube and emit a low frequency sound wave of about 20 hertz into the hopper.

[Function] The powder and granules in the hopper are directly vibrated by the low-frequency sound waves emitted into the hopper, and the crosslinked state of the granules is broken, making the outflow smooth.

[Example] Next, an example of the present invention will be described with reference to the drawings.
A hopper 1 whose circumferential side wall 2 is formed in the shape of a funnel allows the internal powder 4 to fall into a chute 5 appropriately by opening and closing a rotary valve 3 provided at its lower end. An opening 6 is provided in the opening 6, and a cylindrical resonance tube 7 is fixedly installed in the opening 6.
A sound generator 8 is provided at the tip. The sound generator 8 receives compressed air from the compressor 9 through the hose 10, vibrates the air column in the resonance tube 7, and emits a low frequency sound wave of about 20 hertz into the hopper 1. A control device 11 detects the output and oscillation frequency of the sound generator 8 and controls the operation of the compressor 9. By emitting low frequency sound waves into the hopper 1 through the opening 6 in this manner, the powder and granular material within the hopper 1 can be strongly vibrated. Therefore, the cross-linked state is broken by the vibration, allowing smooth flow. In this case, the circumferential wall 2 of the hopper does not directly vibrate strongly, and even if it does vibrate, it is very weak and the degree of progress of metal fatigue is small. Therefore, it is virtually impossible for the life to be reached due to fatigue failure caused by vibration.

[Effects of the invention] As explained in the embodiments above, the hopper for supplying powder and granular material of the present invention has a resonant tube in the opening provided in the peripheral side wall, and vibrates its air column to produce a hopper of about 20 Hz. Since it is equipped with a sound generator that emits low-frequency sound waves into the hopper, the powder and granules in the hopper can be strongly vibrated by the air column resonance of the resonance tube, and the bridging state can be eliminated to create a smooth product. I can promise you that it will leak. Unlike conventional vibrators that vibrate the hopper itself, it does not cause metal fatigue of the hopper itself, so it has remarkable effects such as high durability.

[Brief explanation of drawings]

The figure is a system diagram of a hopper and its peripheral equipment showing an embodiment of the present invention. 1... Hopper, 2... Circumferential wall, 4... Powder, 6... Opening, 7... Resonance tube, 8... Sound generator.

Claims (1)

[Scope of utility model registration request] An opening is provided in a part of the peripheral edge of the funnel-shaped hopper, a cylindrical resonance tube is fixed in the opening, and the air column inside the resonance tube is vibrated at the tip of the resonance tube to generate a low frequency of about 20 Hz. A hopper for supplying powder or granular material, characterized in that it is equipped with a sound generator that releases sound waves into the hopper.