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Using method and description of pressure-relieving pressure type mobile sand blasting machine


Pressure relief type mobile sand blasting machine

Features: The sand blasting machine operates automatically for each operation, and is operated by one person, which is simple and convenient. When each operation is completed, the air control switch is released and the sand cylinder is automatically vented, which is safe and reliable. At the same time, the pressure relief can reduce the phenomenon of sand blocking.

Pressure mobile sand blasting machine is a kind of thermal spraying pre-processing machine, which uses compressed air as the power to spray clean and dry abrasive at high speed to the surface of the workpiece to be sprayed to achieve surface cleaning,

For texturing requirements, it can also be used for paint removal, welding seam rust removal, and hair blasting for the preparation of texturized glass and other workpieces. The effect is very significant. The cleaning level reaches SA2.5-3.0, and its roughness reaches industrial level.

Art requirements. The product has a wide range of uses, compact structure, simple maintenance, easy to use, etc. It is a necessary machine for thermal spraying (welding) various anticorrosive layers.

The pneumatic remote control system of the pressure-relieving pressure mobile sand blasting machine is composed of an air intake valve, an automatic exhaust valve, a control air pipe, a manual control switch and an air control sand control valve assembly.
When working, the handle is depressed, and the air flow is controlled to reach the manual switch through one air pipe, and is discharged to the air intake valve, exhaust valve and sand control valve through the other air pipe, so that the air inlet valve opens, the sand control valve opens, and exhaust
The valve is closed, which is the pressure increase in the sand cylinder, and the blasting operation starts.
The characteristic of this model is that each time the three valves, air shut-off valve (intake valve), automatic exhaust valve, air-controlled sand control valve, must be activated, the gas of the blasting cylinder will increase and discharge, and
Each time there is a certain amount of time to switch on and off, because the gas from the blasting cylinder is completely discharged, the operator can lower the nozzle.
Because the pneumatic remote control abrasive valve is used, the sand regulating valve is normally closed when the machine is turned off. When the machine is turned on, the air pressure impacts the rubber lining in the sand valve, and the striker against the rubber core in the I-shaped seat will loosen.
The valve is open. Therefore, every time the switch is opened, there will be a certain amount of storage in the sand tube, and there will be an instant pulse when the gun is fired.
This system is not suitable for sandblasting operations longer than 20m, because the pneumatic remote control reaction has a lag time. For sandblasting operations longer than 20m, it is recommended to add a power distribution control system, which can greatly
Reduce reaction time. If it is necessary to use pneumatic control, it is best to switch to a 45-degree manual butterfly sand adjustment valve, and at the same time have to endure a delay of 3-5 seconds.
I. System parameters of this model:
1. Main technical parameters and structure of equipment
1) Main technical parameters
Cylinder block diameter: 600mm Sand blasting efficiency: 15-35 square / H
Cylinder height: 1300mm Blasting grade: SA2.5-3.0
Volume: 0.3 cubic metersAir consumption: ≥3 cubic meters / min
Air source pressure: 0.6-0.7Mpa
Features: pneumatic control, low failure rate, less wearing parts, less investment, high efficiency, wheeled structure, fixed-point and mobile sandblasting, easy to move.
Second, use
1. Preparation
Connect all connections and circuits and all pipelines as shown in the figure, and check whether they are firm and sealed.
Check whether the pneumatic control system is normal and whether the manual control switch is normal.
Check that the exhaust valve is closed.
Wear a protective mask for sandblasting.
1) Connect the sand blasting machine to the air source with an air hose and tighten it correctly.
2) Connect the blast tube to the quick connector of the abrasive valve outlet and lock it.
3) Start the air compressor so that the indicated pressure reaches the required working pressure. The air compressor is placed on the air outlet of the sand blasting machine to prevent dust caused by sand blasting from being sucked into the air compressor.
4) Put the clean and dry abrasive into the barrel of the sand blasting machine.
5) Wear protective equipment for sandblasting.

2.Operation
1) The sandblaster holds the sandblasting gun and prepares for work.
2) Press the manual control switch, the intake valve delays for a few seconds, and the air source is turned on.
3) After venting, the high-pressure air automatically opens the air inlet valve (air shut-off valve) and air-controlled sand regulating valve, closes the air vent valve, air enters the sand cylinder, and the cylinder is pressurized. ,
The pressure in the blasting machine continues to rise, and the blasting gun can automatically enter the blasting state. At this time, only air flows out of the nozzle.

② During the blasting operation, adjust the handle on the remote control abrasive valve according to the blasting state to adjust the flow of the abrasive outlet, tightening clockwise and loosening counterclockwise. The flow of the abrasive should not be too large.
When viewed under the sun or other bright light sources, the flow of air containing abrasives is not much different from the flow of pure air.
Because the machine uses a pneumatically controlled sand control valve, the valve core in the I-shaped seat is closed during normal shutdown, that is, the left screw is adjusted to the middle part of the sand valve rubber core, and the right hand of the sand control valve is adjusted to squeeze.
The right beam in the I-shaped seat makes the beam squeeze the rubber core to the left to the middle and closes with the rubber core on the left side of the screw to form a close. When the manual control switch is pressed, the compressed air will squeeze the adjustment after entering the sand control valve
The rubber pad inside the sand valve makes the spring shrink, and the right side beam in the I-shaped seat returns to open the inner channel of the rubber core, and the abrasive passes through the sand valve to form sand blasting work.
3) At the end of the operation, release the manual control switch. Within a few seconds after the control signal is lost, the machine automatically closes the air intake valve and the remote control abrasive valve, opens the air release valve, exhausts the cylinder, and the blasting gun automatically stops the blasting operation.
After the sand blasting operation is completed, the power supply and intake valve must be turned off, the air compressor must be turned off, and the remaining abrasive in the cylinder must be cleaned to prevent wet agglomeration or sand blocking.
Third, stop
When the sand blasting machine takes a long time to stop, the abrasive in the barrel should be cleaned to prevent failure due to the damp of the abrasive when it is reused. The steps to clean the abrasive are:
1. Remove the nozzle.
2. Place the sandblasting hose in a container.
3. Close the main air valve and exhaust valve and the abrasive valve is opened to the maximum.
4. Open the intake valve. Let the sandblaster work until you drain more than the abrasive in the cylinder.
The sand blasting machine should be covered when placed outdoors at night to prevent water from entering the bucket.

Fourth, maintenance
1.Replace the closed valve (umbrella bucket)
Open the service port valve, and use a small pipe wrench to unscrew the connector (conduit) under the conical closed valve (umbrella bucket) and remove them from the barrel. Replace it with a new shut-off valve. Hold
Close the inspection hole cover and tighten all the screws.
2.Replace the inlet seal
Use your nails or a screwdriver to gently remove the old seal and press the new seal into the seal seat.
3. Regularly check the lubrication and wear of O-rings, pistons, springs, gaskets and other parts in the intake and exhaust valves.
4. Clean the filter element in the filter twice a day to ensure the normal operation of the system. When the filter element is damaged or blocked, it should be replaced in time.

Five, troubleshooting
1.Clog
1) No abrasive or air at the nozzle outlet
Close the intake valve and open the exhaust valve. After the pressure of the blasting machine is released, check whether the nozzle is blocked.
2) Abrasive with air
Open the abrasive valve to the maximum limit, quickly open it and then immediately close the main air valve (ball valve switch at the air inlet). If this method does not work, you need to open the inspection hole to clear the debris in the bucket
Or open the abrasive valve and remove the obstruction in the abrasive valve.
2. It is normal that the abrasive flow is slightly unstable. If the abrasive flow continues to be unstable, quickly open it and then immediately close the main air valve to eliminate this fault.
3.Remove dampened abrasive
Remove the blasting hose and the corresponding gasket, open the abrasive valve and the air inlet valve, and the damp abrasive can be removed (note: the import speed of the abrasive is very high, and unrelated personnel must stay away from
The inlet of the abrasive valve). Then close the intake valve, open the exhaust valve, and then connect the blast hose with the nozzle removed to the blast machine. Open the intake valve and the main air valve, and wet the abrasive in the blast hose.
Also cleaned up. Close the exhaust valve, and then connect the nozzle to the blasting hose. The blasting operation can be resumed in normal steps.
4, the exhaust valve does not exhaust or exhaust slowly
1) Clean or replace the filter element in the filter
2) Clean or replace the muffler
3) Replace the spring or film in the exhaust valve.

Nozzle diameter
Effective pressure (MPa)
Cleaning efficiency m 2 / h (Sa2.5—Sa3.0)
0.5
0.6
0.7
6.5mm
Air consumption (m 3 / min)
1.6
1.9
2.1
6-11
Abrasive consumption (Kg / h)
170
200
240
8mm
Air consumption (m 3 / min)
2.9
3.5
3.9
10-20
Abrasive consumption (Kg / h)
280
340
380
10mm
Air consumption (m 3 / min)
5.4
6.5
7
16-30
Abrasive consumption (Kg / h)
500
600
680
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Address: Building 1-1, Building A, Qihe Industrial Park, No. 33 Xinxing Road, Xinlian Community, Humen Town, Dongguan City. Tel: 0769-82261696 / Mr. Zhong Visits:
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