What Are the Best Tips for Sandblasting with Water?

The wet blasting method, that is, the wet blasting technology, is a kind of blasting method to remove rust. It uses a sand pump to spray a mixture of sand and water onto the surface of the workpiece at a certain pressure, so that the surface of the workpiece can reach a clean A surface treatment technology for dirt, rust or matte treatment. Wet blasting technology, as a highly efficient surface treatment technology with high efficiency, wide use, low cost, and without the need for strong chemical additives, has been very mature in the world's advanced industrial countries.

Sand blasting is the use of compressed air to spray a certain size of sand on the rusted surface of the part through a spray gun. It not only removes rust quickly, but also prepares the surface for painting, spraying, electroplating and other processes. The surface can meet the requirements of clean and rough surface, thus improving the binding force between the cover layer and the part.

Common sand blasting and rust removing methods include dry blasting, wet blasting, dustless blasting and high-pressure water blasting. The dry blasting dust is large, which is harmful to environmental protection and harmful to health; although the wet method is free of dust, the moisture will make the surface rust again. The preventive method is to add 1% to 15% of rust inhibitor (trisodium phosphate, sodium carbonate, sodium nitrite, etc.) and emulsifier or soapy water in water to make the surface no longer rust in a short period of time, and then Apply maintenance primer. Dust-free blasting is a continuous cycle of sand addition, sand blasting and sand collection in a closed system to prevent dust from flying. High-pressure water blasting is mainly used for large-scale rust removal, such as hulls, oil tanks, oil tanks, boilers, etc. Passivators and soapy water are often added to water.

Wet blasting technology, as a highly efficient surface treatment technology with high efficiency, wide use, low cost, and without the need for strong chemical additives, has been very mature in the world's advanced industrial countries. The main functions are the processing of various workpiece surfaces for cleaning purposes, the cleaning of various instruments and utensils for cleaning purposes, and the grinding and processing of various materials for arts and crafts purposes.

Wet blasting can simultaneously remove the oil, grease and greasiness on the surface of the workpiece at the same time, the isolation of carbonized dirt on the surface, heat build-up rust scale shell, metal surface rust and radiation pollution elements.

(1) The surface treatment before plating and painting is absolutely clean.

(2) Degreasing, derusting, sanding and roughing, tension release and internal crack inspection of marine, land and airborne machinery and electrical parts.

(3) Cleaning, polishing and roughing of the mold.

(4) Promote the fatigue working life of metal parts, such as mechanical parts springs, milling cutters, shuttle blades, see hard work, etc.

(5) Remove the impurities and mold release agent from castings.

(6) Isolation of pollution elements from radioactive work, etc.

In the repair process of factories and sections of railway vehicle maintenance in China, there are four main types of derusting of wheel sets: alkali cooking type, shot blasting type, water wheel type, and hydraulic wire wheel type. The first two methods are obsolete methods. The latter two methods rely on the direct contact of the wire brush to remove the rust. There are many faults and the effect is difficult to meet the requirements. For this reason, the mature wet blasting (particle blasting) technology applied in advanced foreign developed countries can be used to clean the wheelset shaft body and the surface of the dustproof plate seat.

Working Principle of Wet Sandblasting Wet Sandblasting Wheel

The wet blasting wheel derusting machine is mainly composed of a sealed cabin, a derusting system, an in and out wheel mechanism, a sand box, a pneumatic system, and a sand water pipeline system. The working principle is as follows: the wheel set is pushed into the cleaning work cabin by the wheel-in mechanism, after positioning, the sealed door is closed, the runner is started, the sand pump is operated and the compressed air is turned on, and the nozzle of the spray gun adjusts the sand water and compressed air to a certain level. The speed and pressure are sprayed onto the surface of the wheelset shaft body and the dust plate seat, and all the dirt such as oil stains, dirt, rust and the like on the surface are removed. After the spraying is completed, the water pump is started again, and the residual sand on the surface of the wheel pair is flushed with pressure water to make the outer surface of the wheel pair reach the specified cleanliness. After the cleaning is finished, the working cabin door is automatically opened, and the wheel out mechanism pushes out the cleaned wheelset. The next wheel pair to be cleaned is re-entered into the work chamber for cleaning, and iterate again and again.

Key points of scheme design of wet blasting method for rust removal machine

(1) Beautiful and elegant sealed stainless steel cleaning work cabin.

(2) The design of the water storage bucket for circulation requires that the sand-water ratio in the sand-water tank is guaranteed, and that it has the function of separating water, oil, dirt and sand.

(3) Determine the relevant technical parameters for cleaning a wheel pair in 5 minutes.

(4) Understand the structure, principle and working condition of the particle jet pump, conduct necessary tests, pinpoint the parameters, and select the correct model.

(5) Calculate, research, test and manufacture the cleaning method of the wheelset, the number and structure of the nozzles, the optimal spraying distance and angle.

(6) Study the type and particle size of the selected sand.

(7) Investigate the structure of cleaning the wheel-shaft body by using a power source to realize the traverse of the spray gun.

(8) Research on safe and convenient wheel mechanism and wheel pair rotation mechanism.

(9) Design a safe and reliable PLC control system to achieve process control, with manual and automatic control functions.

(10) Sewage pump control system with automatic cleaning function when designing sewage discharge.

Main technical characteristics of wet blasting

The machine has the following main technical characteristics:

(1) High efficiency, good quality, low cost and no need to use strong chemical additives. The quality of the cleaning wheel pair in this way greatly exceeds the quality of wire brushes and pressure cleaning, creating good conditions for further inspection of the flaw detection wheel pair.

(2) Save water and electricity.

(3) The machine has the function of separating oil, water, dirt and sand to ensure that sand and water can be recycled.

(4) The maintenance cost is low, and the popular PLC control is adopted. It has automatic and manual modes and is easy to operate.

(5) Comply with environmental protection requirements and have no pollution to the environment ^[1] .