To quickly and efficiently clean surfaces from dirt, old coatings and rust, it is best to use sandblasting. This type of cleaning is carried out using special equipment - cameras, guns. If a pressure washer is available, you can save on the purchase: the sandblasting nozzle on the Karcher will help in everyday life and repair, but you can do it yourself.
- The principle of operation of the nozzle
- Applications for nozzles
- Making a homemade nozzle
- Action algorithm
- Guidelines for the safe use of the nozzle
The principle of operation of the nozzle
Whatever the sandblasting device, the principle of its operation is as follows: as a result of the compressor, the air flow is under high pressure, due to which an abrasive (usually sand) enters the nozzle of the device. The latter is fed through the outlet with a thin but strong jet directly onto the workpiece, as a result the top layer is removed.
Sandblasting for Karcher is a device capable of making a high pressure washer suitable for operating as a sandblasting gun. Such a nozzle does not replace professional equipment, but it is perfect for cleaning small surfaces. Instead of air, the charge of kinetic energy of each portion of sand will be given by water, but otherwise the principle of operation of the device will remain the same:
- under the action of the high pressure created by the compressor, water passes through the intake hole of the hose, the second end of which is placed in a container with sand;
- a vacuum is created in the intake hose, which helps the abrasive to move into the main hose;
- after mixing sand and water, the stream is fed through the outlet to the surface of the product.
to contents ↑To reduce the consumption of sand and increase the efficiency of processing, it is possible to introduce dispensers, cranes into the indicated design. Typically, a sandblasting nozzle for Karcher consumes 30 kg of sand for each 0.8-1 square meter of surface.
Applications for nozzles
Due to the high power of the jet using a nozzle on the "Karcher" you can process various surfaces:
- clean wood, concrete from plaster, old paint, varnishes, building mixtures;
- remove rust, scale from metal;
- to clean various products before processing, applying protective and finish coatings;
- get rid of hard to remove pollution;
- remove stains and drips of glue, mounting foam.
Making a homemade nozzle
A special nozzle for high pressure washing turns the latter into a good sandblasting unit, it is only important to purchase high-quality components. You will need:
- reliable hose with the ability to work under pressure;
- dispenser to save abrasive;
- a nozzle for ejecting sand with water;
- trigger hook;
- clamp and fitting.
The nozzle durability and the final result will depend on the quality of the nozzle, so it is better not to save on it.Ceramic devices fail faster than those made from alloys of tungsten and cobalt. However, metal nozzles can be susceptible to rusting due to the presence of water in the sink, so sooner or later any nozzle may deteriorate. For more expensive devices, the trigger is included, otherwise you will have to buy it separately.
to contents ↑The nozzle on the "Karcher" for sandblasting necessarily includes a reinforced hose with a length of at least two meters. Do not purchase hoses without additional reinforcement of the frame - they are not able to work under pressure in several atmospheres. A product of dubious quality will tear pretty quickly.
Action algorithm
To make a nozzle with your own hands, you need to act in this way:
- fix the nozzle tip with a thread;
- attach a dispenser to adjust the water supply with an abrasive to the nozzle;
- combine the container with sand and the main device with a hose, clamp, fitting of the desired size.
All structural elements must be screwed tightly, correctly, because they will undergo the influence of the pressure created by the compressor. Joints must be completely tight, and FUM tape can be used to strengthen them. To save money, all work is best done on a container with a grill, on which the workpiece is conveniently placed. After the water with sand can be collected and reused, lowering the hose to collect the solution.
to contents ↑Guidelines for the safe use of the nozzle
In order not to harm yourself, you must work with a high pressure washer and nozzle in compliance with safety measures, otherwise the water-sand mixture can cause injuries. The advantage of this device over a conventional sandblasting gun is the absence of dust deposited in the lungs, so there is no need for a respirator. But you need to follow these tips:
- wear strong workwear;
- to be in comfortable closed shoes;
- carry out cleaning of products on the street, and not indoors.
In the presence of a sinker "Karcher" or its analogue to independently build a sandblasting unit is easy. This will save money and allow to produce high-quality surface treatment for every emerging need.
