JPS6117822Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a sandblasting machine, and more particularly to a dry sandblasting machine having a sand drying device.

Sandblasting is widely used for surface cleaning work such as removing rust from metal products, or for surface cleaning and satin finishing of plastics, etc., but the sand used for this must be dry with low moisture content. However, it is customary to use fuel to dry wet sand in a kiln, which inevitably increases costs by the amount of fuel. In addition, there were other problems, such as the need to take special measures to prevent sand from getting wet when storing and transporting it.

The purpose of the present invention is to provide a dry sandblasting machine with a sand drying device using compressed air, a sand drying container connected to an air compressor and having a filter and a damper at the bottom, and a sand drying container attached to the bottom of the sand drying container. The present invention relates to a dry sandblasting machine with a sand drying device, which has a discharge pipe, a sand discharge pipe that branches from the discharge pipe and sends sand to the sandblasting machine, and a blow pipe that branches from the discharge pipe and sends compressed air to the sandblasting machine.

Next, embodiments shown in the accompanying drawings will be described.

A funnel-shaped sand intake port 2 is provided at the top of the sand drying container 1, and an on-off valve 3 is provided at the neck of the sand drying container 1 so that it can be moved up and down. It rises due to pressure and comes into contact with the packing at the neck of the intake port to seal the compressed air from leaking to the outside from the intake port.

A filter 5 is provided near the inner bottom of the sand container 1 to prevent sand from falling and to allow drying air that has passed through the sand layer to flow through a valve 7 to a discharge pipe 8. The filter 5 is equipped with a damper 6, which is closed during drying to allow drying air pressure to pass through while preventing the sand from falling together with the filter.However, when sending dry sand to the sandblasting machine, the damper 6 is closed. is opened to allow the sand in the sand drying container 1 to flow through the valve 7 to the discharge pipe 8 together with the compressed air passing through the container.

The discharge pipe 8 is connected to a sand discharge pipe 10 by a valve 9, and the sand discharge pipe 10 is connected to the upper part of the sand container 12 of the sandblasting machine 11, so as to supply dry sand to the sand container 12 of the sandblasting machine. There is.

Further, a blowing pipe 13 branches off from the discharge pipe 8 via a switching valve 9 and is connected to a sandblasting machine valve 15 via a drain outlet 14.
6 blows compressed air into the sand container 12 for sandblasting, and the branched air pressure pipe 17 is connected to a cut-out valve 18 at the bottom of the sand container 12, so that compressed air is blown into the sand container 12 through the cut-out valve 18. Similar to a normal sandblasting machine, the outflowing sand is loaded onto compressed air and sent to the blowing hose 19.

Since the structure is as shown above, damper 6
Close the container, put wet sand into the sand drying container 1 through the intake port 2, and operate the air compressor C.
If necessary, compressed air is fed into the sand drying container 1 through the drain 20.

The compressed air passed through the sand layer 21 and then passed through the valve 7 at the bottom, the discharge pipe 8, the switching valve 9, and the blower pipe 1.
3. It passes through the drain 14 and the air pipe 13a to the valve 15 of the sandblasting machine 11, and as usual, air is supplied to the tank 12 through the blow pipe 16 and is supplied to the blowing hose 19 from the air pressure pipe 17.

A large amount of air is required to blow sand from the blowing hose 19. For example, when using a 6 mm round nozzle to blow sand per hour, approximately 200 kg of sand and 130 m ³ of compressed air are required. It is said that there is. Therefore, when such a large amount of air passes through the sand layer, the water adhering to the surface of the sand grains can be blown away or removed by aeration.

The dry sand in the sand drying container 1 opens the damper 6, and together with the compressed air passing through the container, the dry sand passes through the discharge pipe 8,
The sand is supplied into the sand container 12 of the sand blasting machine 11 through the switching valve 9 and the sand discharge pipe 10, and the damper 6 is closed in the empty sand drying container 1, and wet sand is again taken in from the intake port 2. and blow compressed air as described above.

If dry sand is available, it is poured directly into the sand container 12 of the sandblasting machine as before, and the compressed air is directly supplied to the sandblasting machine through a bypass blowing pipe (not shown) that connects the blowing pipe of the air compressor C and the valve 15 of the sandblasting machine. All you have to do is send it and activate it.

Next, the work data for an example using this device is as follows. When the humidity in the atmosphere is 45%, 300 kg of sand with a roundness of 1 to 1.5 mm and a water content of 4.5% by weight is put into sand drying container 1, and the drying rate is ³ m3 per minute. of compressed air (6
kg/cm ² ) into the container 1, passed through the sand layer, and was discharged from below. After blowing air for 15 minutes, the air blowing was stopped and the sand was taken out from the bottom of the container.The moisture content was 0.8%, which was the same level as the dry sand used in the past.

As explained above, according to the device of the present invention, wet sand can be dried to a usable level by passing compressed air without using fuel. There is no need to purchase specified sand, and sand storage becomes easier.
Moreover, the compressed air used for drying can be used as compressed air for sandblasting after draining, so it has extremely great practical effects such as being economical.

[Brief explanation of the drawing]

FIG. 1 is a partially fragmented front view showing an embodiment of the sand drying device of the present invention, and FIG. 2 is a partially fragmented front view of a sandblasting machine to show the relationship with the sand drying device. 1...Sand drying container, 2...Sand intake port, 3...Opening/closing valve, 4...Blowing pipe, 5...Filter, 6...Damper, 7...Valve, 8...Discharge pipe, 9... Switching valve, 10...Sand discharge pipe, 11...Sandblasting machine, 12...Sand container, 13...Blower pipe, 14
... Drain drain, 15 ... Valve, 16 ... Blowing pipe, 17 ... Pressure pipe, 18 ... Cutting valve, 1
9...Blowing hose, 20...Drain drain, 21...
...sand layer.

Claims (1)

[Scope of utility model registration request] A sand drying container connected to an air compressor and having a filter and a damper at the bottom, a discharge pipe attached to the bottom of the sand drying container, a sand discharge pipe branching from the discharge pipe and sending sand to the sandblasting machine, and from the discharge pipe A dry sandblasting machine with a sand drying device that has a branched air pipe that sends compressed air to the sandblasting machine.