Generally speaking, the dust-removing nozzles in the de […]
Generally speaking, the dust-removing nozzles in the degreasing and water washing process can be selected from the jet type nozzles with strong impact force: the "V" type fan-shaped nozzle is taken as an example, and the spray angle is preferably 60°, which has a large impact force. The nozzle of the phosphating process can use a centrifugal nozzle with good atomization, fine and uniform water particles and weak impact force: taking the "Z" type cone nozzle as an example, the optimal distance of the nozzle from the workpiece is 40cm~ 50cm, with a spray effect that disperses and atomizes the liquid. The arrangement of the nozzles on the nozzle can be in the form of parallel and cross, and the channel type adopts vertical cross arrangement, and the spraying effect is better.
The factors that select the nozzle are flow, pressure, spray angle, coverage, impact force, temperature, material, application, etc., and these factors are often intertwined and mutually constrained. Flow and pressure, spray angle and coverage are proportional. The purpose of any jetting nozzle is to maintain continuous contact of the bath with the workpiece. This factor is more important than pressure. The temperature of the liquid does not affect the spray performance of the nozzle, but it affects the viscosity and specific gravity, as well as the choice of material. The material of the nozzle should also be determined according to the chemical characteristics of the bath. For non-corrosive baths, bronze casting or plastic die casting can be used according to the difficulty of processing. In order to prevent corrosion, non-metallic materials may be used; for strong etching baths such as sulfuric acid and hydrochloric acid, nylon plastic may be used; nozzle materials for phosphating baths are generally made of acid-resistant stainless steel, and nozzles for preventing corrosion may also be directly selected from stainless steel or Made of nylon material.
For nozzles with a certain impact force, a small angle nozzle should be used, and the liquid column flow (ie jet) is the best; the fan nozzle is suitable for cleaning, degreasing, cooling, etc. The cone nozzle is suitable for drifting, surface layer, phosphating, humidifying In the case of dust removal, etc.; the venturi mixing dust nozzle should be installed in the paint storage tank and the tank body. Take the "H" type stirring nozzle (also known as the venturi nozzle) as an example. The bath liquid is inhaled through a certain pressure and the approach channel. The liquids are mixed together at a flow rate of 1:4 and then sprayed out to achieve the effect of mixing the solute without air, thereby preventing precipitation, because the agitation ensures uniform mixing of the chemical solution.