JP2006192507A - Sand blaster - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sand blaster stably feeding blast sand to a mixer in the sand blaster for blowing out the blast sand from a nozzle connected to the tip of the mixer. <P>SOLUTION: The blast sand is passed to a mixer 12 through a pipe 11 from the lower part of a sealed tank by pressurizing the inside of the sealed tank 10 storing the blast sand 16 with air after regulating high-pressure air by a pressure reducing valve 18 or by an air amount regulating valve. Polishing blast is executed on a metal or the like by blowing out the blast sand from the nozzle 15 after mixing the high-pressure air with the sand in a mixing chamber of the mixer by regulating and forcibly feeding a certain amount of the sand to the mixer 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, sand for blasting a metal surface is placed in a closed tank, air is pressurized from the upper part, the sand is pumped from the lower part of the closed tank to a mixer, and high-pressure air and sand are mixed in a mixing chamber of the mixer. The jet blast is more stable than the nozzle connected to the tip of the mixer.

  Conventional sand blasters put sand into a tank and eject high-pressure air from the nozzle of the mixer to generate negative pressure in the mixing chamber. By negative pressure, the sand is guided from the bottom of the tank by a pipe and mixed with high-pressure air and blasted from the nozzle. The way to do is taken.

This has the following drawbacks.
(B) Since the negative pressure in the mixing chamber is weak, the sand of the mixer can not be guided from the tank and blasting may not be possible.
(B) Since the blasting pressure is as low as 0.5 MPa and the sand blasting force is weak, if the blasting pressure is high pressure air of 0.5 MPa or more in order to strengthen the blasting, the negative pressure in the mixing chamber will become even weaker and the sand will be piped from the tank. It will not be able to be blasted after being sent to the mixer.
The present invention has been made to solve these drawbacks.

  A pipe is connected to a pressure reducing valve that adjusts the blast pressure of sand from a high pressure air source. Connect from the pressure reducing valve to the solenoid valve that turns the power on and off with a foot switch. The pipe from the solenoid valve is branched and connected to a pressure reducing valve for pressurizing the sealed tank or an air amount adjusting valve for adjusting the air amount. The pipe coming out from the pressure reducing valve or the air amount adjusting valve is connected to the upper part of the closed tank. Connect the pipe to the lower part of the closed tank and connect the pipe to the mixing chamber of the mixer. Connect another pipe branching out from the solenoid valve to the mixing chamber of the gas mixer. Sand blaster to which the nozzle to which high-pressure air mixed with sand is ejected is connected to the tip of the mixer.

  By pressurizing the upper part of the closed tank, the sand is forcibly sent from the lower part of the closed tank to the mixing chamber of the mixer through the pipe, so that the air is efficiently mixed in the mixing chamber and the sand is stabilized from the nozzle. Can be blasted vigorously at high pressure. The amount of sand to be blasted can be adjusted by providing a pressure reducing valve for adjusting the pressurized air.

Embodiments of the present invention will be described below.
(A) The high-pressure air emitted from the high-pressure air pressure source (1) is connected to the pressure reducing valve (3) for adjusting the blast pressure by the pipe (2).
(B) Connected by a pipe (6) to a solenoid valve (5) which is depressurized by about 0.7 MPa by a pressure reducing valve (3) and turned ON / OFF by a foot switch (4).
(C) The pipe (7) exiting the solenoid valve (5) branches in two directions.
(D) The branched pipe (7) is connected to a pressure reducing valve (8) for adjusting tank pressurization.
(E) The pipe (9) exiting the pressure reducing valve (8) is connected to the upper part of the closed tank (10).
(F) The pipe (11) connected to the lower part of the closed tank (10) is connected to the mixing chamber (13) of the mixer (12) for mixing sand and high-pressure air.
(G) The pipe (14) branched out from the solenoid valve (5) is connected to the mixing chamber (13) of the mixer (12).
(H) A nozzle (15) for blasting high-pressure air mixed with sand is connected to the tip of the mixer (12).
(I) (13) is a mixing chamber for mixing high-pressure air and blasting sand.
(Nu) (16) is blast sand for polishing the metal surface.
(L) (17) is a power source for operating the solenoid valve.
(W) (18) is an air amount adjusting valve for adjusting the air sent to the sealed tank.
When the present invention is used in the configuration as described above, the mixer (12) is held and the nozzle (15) is directed to the blasting object. When the foot switch (4) is stepped on and the solenoid valve (5) is operated, the high pressure air pressure source (1) to the pipe (2), the pressure reducing valve (3), the solenoid valve (5), the pipe (14), the mixer (12) The high-pressure air flows out from the mixing chamber (13) and high-pressure air from the nozzle (15). High-pressure air passes through the pipe (7) branched from the electromagnetic valve (5), and the pressure is reduced to about 0.3 MPa by the pressure reducing valve (8), and is injected from above into the upper part of the closed tank (10). The sand (16) is injected into the mixing chamber (13) of the mixer (12) by pressure feeding through the pipe (11) which is pressurized and connected to the lower part of the sealed tank (10). Sand (16) mixed with high-pressure air in the mixing chamber (13) is ejected vigorously from the nozzle (15) connected to the tip of the mixing chamber, and the metal surface and the like can be blasted with sand efficiently. The blast pressure ejected from the nozzle of high-pressure air mixed with sand can be adjusted by the pressure reducing valve (3). The blast amount of the sand (16) can be adjusted by adjusting the air pressure applied to the closed tank (10) by the pressure reducing valve (8).

    As shown in FIG. 2, the sand blasting amount can be adjusted by installing an air amount adjusting valve (18) instead of the pressure reducing valve (8) and adjusting the amount of pressurized air. Examples of the air amount adjustment valve include a throttle valve and a variable throttle valve.

It is a piping diagram showing the use condition of this invention. It is a piping diagram which shows the other Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High pressure air pressure source 2 Pipe 3 Pressure reducing valve 4 Foot switch 5 Electromagnetic valve 6 Pipe 7 Pipe 8 Pressure reducing valve 9 Pipe 10 Sealed tank 11 Pipe 12 Mixer 13 Mixing chamber 14 Pipe 15 Nozzle 16 Sand 17 Power supply 18 Air amount adjustment valve

Claims (1)

  Connected from a high pressure air pressure source to a pressure reducing valve that adjusts the blast pressure with a pipe, connected from a pressure reducing valve to a solenoid valve that is turned on and off with a foot switch, and the pipe coming out of the solenoid valve branches to depressurize the sealed tank Connect to the valve or to the air amount adjustment valve that regulates the air amount, connect the pipe coming out from the pressure reducing valve or air amount adjustment valve to the upper part of the closed tank, connect the pipe to the lower part of the closed tank, and mix the pipe into the mixer Connected to the chamber, another pipe branched out from the solenoid valve was connected to the mixing chamber of the mixer, and a nozzle to which high-pressure air mixed with sand in the mixing chamber was ejected was connected to the tip of the mixer Sand blaster.

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