beautiful800-2000mm Single Cylinder Double Gun Air Control Sandblasting Machine | Double Gun Pressure Sandblasting Machine | Sandblasting Machine for Sandblasting Room

Pressure-holding sandblasting machine:

(If the air compressor is not equipped with a drying system, please install a water filter at the air inlet of the machine)

Pressure mobile sandblasting machine is a pre-treatment machine for engraving and thermal spraying. It is powered by compressed air and sprays clean and dry abrasives at high speed on the surface of the workpiece to be sprayed to achieve surface cleaning, texturing, engraving marks, etc. If required, it can also carry out paint removal, weld rust removal, preparation of frosted glass and other workpieces for spraying (atomization) treatment, the effect is very significant, the cleaning level reaches SA2.5-3.0, and its roughness meets the process requirements. The product has the characteristics of wide range of uses, compact structure, simple maintenance and convenient use. It is a necessary machine for thermal spraying (welding) various anti-corrosion layers.

The control system of the pressure-maintaining pressure mobile sandblasting machine is composed of an inlet shut-off valve (basic type is a ball valve) and a sand-adjusting valve assembly.

The feature of this model is that the air shut-off valve (4 intake valve) and the sand control valve (8) must be activated every time they are switched on and off, the gas in the sandblasting cylinder will increase and discharge, and every switch is There is a certain period of time, because the operator can put down the spray gun after all the gas in the sandblasting cylinder is exhausted.

Because the manual abrasive valve is used, the sand adjusting valve is normally open when it is turned off, so every time it is switched on and off, a certain amount of sand will be stored in the sand pipe, and there will be a momentary pulse when the gun is fired. After the emptying is completed, the sandblasting gun can blast normally, and a delay period of 5-10 seconds is required.

If it is necessary to shut down and stop working, first close the intake valve, and then close the sand adjustment valve (8) (or the falling sand ball valve) at the bottom of the sand tank, and close the side air valve-ball valve after the residual sand and air in the sand pipe are exhausted. (4A), and finally put down the spray gun to ensure safety.

1. System parameters, precautions and requirements of this model:

1 Main technical parameters of the equipment:

Sand pot seal mushroom head size:                  Replacement time: can not be sealed or leak must be replaced

Sand tank sealing O-ring size:                  replacement time: can not seal or leak must be replaced

Diameter of sand mouth at the bottom of the tank: 2 inch internal thread    

Sand control valve: 2 inch threaded male interface               replace once

Side main pipeline: 1-1/4 inch water pipe (one inch two)    Ball valve: 1-1/4 inch internal thread straight ball valve

Sand Pipe Fitting: 1-1/4 inches Dragon Grab             Sand Gun Connector: 1-1/4 Inch Internal  Fine

Sandblasting Gun: 1-1/4 inches Fine teeth single air inlet throat diameter 10MM  gun material: outer steel sleeve inner high temperature sintered boron carbide nozzle

Air supply pipe requirements: inner diameter ≥ 32MM

Sandblasting pipe requirements: inner diameter 25MM or 32MM  high wear-resistant and pressure-resistant sandblasting pipe, pressure resistance 10mpa.

2 Advantages of this machine：

1. Compact structure, superior performance, simple and convenient operation;

2. The design and production of the cylinder body conform to the pressure vessel standard, which is safe and reliable.

3. Standard general parts are used, easy to replace, and the cost is lower, especially the separation of wear parts and fixed parts, and the addition of wear parts in the middle, effectively reducing the cost of replacement loss；

4. It can be modified and installed at any time with instant control function, using electric control or pneumatic control to meet the different needs of customers, and can be operated by a single person.

5. The shell is thickened and sprayed with anti-rust paint, which is beautiful and practical. .

3 Abrasive particle requirements:

The sand used for sandblasting and rust removal requires hard particles, angular, dry and free of soil and other impurities; the standard is brown corundum grain size sand, and quartz sand is the best economical price, and coarse river sand is also acceptable; at the same time, sand should be considered Material transportation conditions, unit price, recycling capacity and other factors; the particle size of sand material should be 0.5 ~ 1.5mm, it must be dried before screening, and stored in the shed or indoors. Diameter 1.2mm), fine sieve 372-476 holes (particle size 0.3mm)

When adding sand to the sand tank, the top of the tank should be covered with a screen of 16# or more to screen the sand particles to prevent foreign matter from falling into the tank and causing blockage of the sand valve or nozzle.

4 Air source requirements:

Power Comparison:  35HP (using 8MM nozzle)/50HP (using 10MM nozzle)/75HP (using 12MM nozzle)

Compressed air must be processed by cooling device and oil-water separator to ensure dry and oil-free;

The oil-water separator must be cleaned regularly;

Generally, the air pressure of the air compressor is 6.0×105～6.5×105Pa, and the pressure amplitude is 0.5×105～1.0×105Pa.

Generally, the air pressure of the sand bucket is 4.5×105～5.5×105Pa, not less than 4.0×105Pa.

If the pressure of the sand tank exceeds 0.7MPA, please stop the gas supply, and exhaust the gas in the tank, check the cause and deal with it.

2. Use
1. Prepare

Requirements for working protection before use of rust blasting machine:

Inspection - The non-blasted parts should be shielded and protected before blasting.

Check - before sandblasting, whether the various pipes and control valves of the sandblasting machine are well connected, and whether they are in appropriate switch positions - the sand adjustment valve (8) and the intake valve (4) must be in a closed state, and the exhaust valve (17) must be in a closed state. ) is closed.

Check - whether the protective tools, safety belts (ropes) and oxygen supply devices worn by the blaster are safe and reliable, and the wear of the nozzles (when the orifice

The nozzle should be replaced when the diameter increases by 25%).

Connect each connection road and all pipelines according to the diagram, and check whether they are firm and sealed.

Check - whether the pneumatic control system is normal and whether the manual switch is normal.

Check - the exhaust valve is closed.

1) Use an air hose to connect the sandblasting machine to the air source, and tighten it correctly (use a special joint to connect and fix it, and add an iron wire to pull the air tube) to prevent the tube from falling off.
2) Connect the sandblasting pipe to the quick connector at the outlet end of the abrasive valve, and lock it (lock the hole with a screw after the dragon grip is docked) to prevent the sand pipe from falling off during use, resulting in accidental danger.
3) Put clean and dry abrasives into the sandblasting machine barrel. (It is easy to add sand within 2/3 of the sand tank)
4) Start the air compressor to make the indicated pressure reach the required working pressure, and place the air compressor on the upper air outlet of the sandblasting machine to prevent the dust caused by sandblasting from being sucked into the air compressor.

5) Wear protective equipment for sandblasting.

2. Operation control of steel structure descaling sandblasting machine:

1) First turn off the side trachea ball valve switch (4A), and close the tank bottom sand adjusting valve or ball valve (8) at the same time, and the sandblaster holds the sandblasting gun to prepare for work.
2) Turn on the air source of the air compressor, turn on the switch (4) of the air inlet valve, the air source of the air inlet valve is connected, and the air in the cylinder starts;

Please observe the pressure gauge, the normal pressure value is in the range of 4-6MPA, if the pressure of the pressure gauge is too large, exceeding 7MPA, please stop the gas supply, and drain the gas in the tank, check the cause of the excessive pressure value, and contact the supplier (air compressor or sandblasting machine) consulting related matters;

3) After ventilation, high-pressure air enters the sand cylinder, pressurizes the cylinder, the umbrella-shaped sealing valve on the top automatically lifts up to seal the feed port, the pressure in the sandblasting machine continues to rise, and the sandblasting gun can automatically enter to prepare for sandblasting At this time, the sandblaster should hold the spray gun tightly and be ready for sandblasting at any time.

4) Turn on the side trachea ball valve switch (4A), air comes out from the spray gun, then open the sand valve ball valve (8) at the bottom of the sand tank, and the sand blasting starts.

During sandblasting operation, according to the sandblasting state, adjust the handle on the abrasive valve (sand valve ball valve 8 at the bottom of the sand tank) to adjust the size of the abrasive outlet flow (close in the horizontal direction, fully open in the vertical direction), and the flow rate of the abrasive It should not be too large. Observed under the sun or other bright light sources, the air flow containing abrasives is not much different from the pure air flow.

5) At the end of the job, the blaster still needs to hold the gun tightly, and another assists the blaster to shut down the machine.

Close the ball valve switch (4) --- close the sand valve ball valve (8) at the bottom of the sand tank --- close the side trachea ball valve switch (4A)

At this time, the sandblasting gun slowly and automatically stops the sandblasting work. The sandblaster needs to wait for the residual sand and air in the sand pipe to be exhausted before putting down the gun to ensure safety.

After all the processes are completed, there is still high-pressure gas in the sand tank. After a short pause, you can continue with steps 1)-4) for sandblasting. If it is necessary to stop, manually open the exhaust ball valve (17) on the top side of the sand tank to discharge the gas in the tank.

Sandblasting distance: The distance between the gun and the surface of the base steel during sandblasting is preferably 100-300mm.

Sandblasting angle: the angle between the spraying direction and the normal to the surface of the base steel is preferably 15° to 45°.

After sandblasting and rust removal, before proceeding to the next process, in case of rain or other conditions that cause the surface of the base steel to be wet, after the environment reaches the construction conditions, dry the surface moisture with dry compressed air before sandblasting construction. . If it is necessary to re-blast, the abrasive requirements cannot be reduced, so as not to reduce the roughness and cause low adhesion of subsequent spraying.

After the blasting operation is completed, turn off the main air source of the air compressor, stop supplying air to the air compressor, open the air compressor exhaust valve, and discharge the residual gas in the air compressor. Turn off the power and turn off the air compressor. If the sandblasting machine is not used for a long time, it is necessary to clean the remaining abrasive in the cylinder to prevent wet agglomeration or sand blocking.

三、Downtime
   When the sandblasting machine needs to be shut down for a long time, the abrasive in the barrel should be cleaned to prevent the abrasive from being damaged due to moisture when it is reused. The steps for cleaning the abrasive are:
1. Remove the nozzle.
2. Place the blast hose in a container.
3. Close the side air valve (4a) and the exhaust valve (17) and open the abrasive valve to the maximum extent.
4. Open the intake valve (4), let the sandblasting machine work until the more than abrasive in the cylinder is drained, and finally open the side air valve (4a) to blow out the abrasive in the sand pipe.

When the sandblaster is placed outdoors at night, it should be covered to prevent water from entering the bucket.

四、Maintenance
1. Replace the closing valve (umbrella bucket)
   Open the access valve, use a small pipe wrench to unscrew the connections (conduit) under the conical closure valve (umbrella bucket), and remove them from the barrel. After replacing with a new closing valve, install it as it is. Install the inspection hole cover and tighten all screws.
2. Replace the sealing ring of the feed inlet
   Use a fingernail or screwdriver to gently remove the old seal and press the new seal into the sealing seat.
3. Regularly check the lubrication and wear of O-rings, pistons, springs, gaskets and other parts in the intake valve (air shut-off valve) and exhaust valve.

五、Troubleshooting
1. Blockage
1) There is neither abrasive nor air at the nozzle outlet
Close the intake valve (4), open the exhaust valve (17), and after the blasting machine is depressurized, check whether the nozzle is blocked, if the blockage needs to be cleaned, you can continue blasting;

2）With air without abrasive
If the nozzle is not blocked, it may be blocked at the sand adjusting valve or the sand opening under the tank bottom. It is necessary to disassemble the sand valve to check, discharge foreign matter, and continue sand blasting after reinstalling the sand valve.

Open the abrasive valve to the maximum limit, open it quickly and then close the main intake valve (4) immediately, then quickly open the main intake valve (4), cycle many times, and use the pulse force to impact the blockage. If this method does not work, It is necessary to disassemble and check whether the sand adjusting valve is blocked. If the problem cannot be solved, the inspection hole (15) needs to be opened to remove the sundries in the barrel and the blockage in the abrasive valve.

2. Unstable sandblasting: It is normal for the abrasive flow to be slightly unstable. If the abrasive flow continues to be unstable, quickly open the side air valve (4a) or close the small side air valve (4a) to eliminate this fault. To reduce airflow, etc., adjust to a certain extent to eliminate instability.

3. Remove damp abrasive
  Ensure that there is no one or a rebounding object in front of the abrasive valve. On the premise of closing the abrasive valve, remove the sandblasting hose and the corresponding gasket, open the abrasive valve (8) and the intake valve (4), and back and forth Close and open the side inlet valve (4a), and the wet abrasive can be removed.

（Note: The inlet speed of abrasive is very high, and irrelevant personnel must stay away from the inlet of the abrasive valve).

Then close the intake valve (4), open the exhaust valve (17), then connect the blasting hose with the nozzle removed to the blasting machine, open the intake valve (4) and the side air valve (4a), and spray Wet abrasives are also removed from the sand hose. Close the exhaust valve (17), then connect the nozzle to the blasting hose, and the blasting operation can be resumed as normal.

4. The exhaust valve does not exhaust or exhaust slowly
1) Cleaning
2) Replace the exhaust valve.

Six: Precautions

1)  The abrasive used must be dry and screened and free of impurities.

2)  The abrasive can only be added up to four-fifths of the tank volume and cannot be filled.

3)  When the umbrella-shaped automatic closing valve (mushroom head) does not move up and down flexibly, please do not introduce abrasives, and it should be repaired or replaced. Aging does not seal).

4)  After all the abrasives have entered the tank, use a dust blowing gun or a broom to clean the mushroom head. Only after all the sand has entered the tank can the air valve be opened to supply air to prevent the sand from wearing the O-ring and the mushroom head.

5)  During the operation, the sandblasting is interrupted due to the fault. Do not hit the tank or spray gun with a hammer, wrench or other heavy and hard objects. Other corresponding measures should be taken to deal with and clean up. The operation should be stopped and the pressure of the tank should be removed. to be processed.

6)  When the sandblasting pipe is under pressure and high pressure, it cannot move, knock, insert and pull out the gas pipe and spray gun at will, otherwise it will cause danger and cause an accident.

7)  Because the abrasive has a certain distance from the sandblasting pipe to the nozzle, it takes a certain time to be ejected from the nozzle. Therefore, when adjusting the sand volume of the sand valve, the frequency of adjusting the handle should be slower, and it should be adjusted while observing ( The sand control valve spray gun cannot be aimed at people and objects).

8)  It is said that the compressed air used must be difficult to filter, filter out the compressed air of moisture and oil mist, and ensure a good pressure, and the maximum pressure cannot exceed 8KG/square (0.7MPa).

9)  Never use abrasives with a grit diameter larger than 1/3 the diameter of the nozzle used.

10) It is absolutely forbidden to point the nozzle at people during sandblasting operations, and people cannot stand beside them.

11) Reasonably select nozzles of different diameters according to the flow of the air compressor, and should be replaced after the nozzle diameter increases (generally more than 1.5MM).

The relationship between nozzle diameter and air compressor flow

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