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    Home > Active Ingredient News > Drugs Articles > How to choose the pre-treatment clip nozzle?

    How to choose the pre-treatment clip nozzle?

    • Last Update: 2010-01-04
    • Source: Internet
    • Author: User
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    How to choose the pre-treatment clip nozzle? The nozzle is a part of coating pretreatment equipment and the core of spray system Spray treatment method is one of the commonly used process methods for coating pretreatment The process is to spray the tank liquid to the surface of the workpiece with a water pump, and complete the processes of degreasing, rust removal, surface adjustment, phosphating and passivation with the help of Mechanical flushing and accelerating chemical action, so as to achieve better degreasing effect, more uniform phosphating film, shorter treatment time and higher production efficiency For different workpieces, there are many factors that need to be considered comprehensively when choosing nozzle type The correct choice can give full play to the performance of coating pretreatment agent and its own characteristics, and obtain the pretreatment effect The characteristics of the 2 nozzles are designed according to their working conditions under various spray conditions Therefore, suitable nozzles are selected so as to achieve Zui good spray performance The characteristics of the nozzle are mainly reflected in the spray type of the nozzle, that is, the shape formed by the liquid leaving the nozzle mouth and its operational performance The name of spray nozzle is divided into fan shape, cone, liquid column flow (jet), air atomization and flat nozzle according to spray shape, and cone nozzle is divided into two categories: hollow cone and solid cone The names of Qiuli nozzle (i.e mixing nozzle), strong cold (hot) air vent blowing nozzle and special nozzle (such as garden nozzle, cylinder washing nozzle, pipe cleaning nozzle, etc.) reflect the operation performance of the nozzle 3 There are many kinds of nozzle elements, which can be selected in a wide range Generally speaking, for the nozzles of degreasing and washing processes, jet type nozzles with strong impact can be selected: take "V" type, i.e fan type nozzle as an example, and the jet angle is as follows: The nozzle of phosphating process can choose the centrifugal nozzle with good atomization, uniform water particle and weak impact force Take the "Z" type conical nozzle as an example, the best distance between the nozzle and the workpiece Zui is 40cm ~ 50cm, which has the spray effect of dispersing and atomizing the liquid body The arrangement of nozzles on the nozzle can be in two forms of parallel and cross For the channel type, the vertical cross arrangement is adopted, and the spray effect is good The factors of nozzle selection include flow rate, pressure, spray angle, coverage, impact force, temperature, material and application These factors often involve each other and restrict each other Flow rate and pressure, spray angle and coverage are directly proportional to each other The purpose of any nozzle is to keep the bath liquid in contact with the workpiece continuously The flow rate is more important than the pressure The temperature of the liquid does not affect the spray performance of the nozzle, but it affects the viscosity and specific gravity, and also affects the material selection The nozzle material should also be determined according to the chemical characteristics of the bath For non corrosive bath, bronze casting or plastic die casting can be used according to the difficulty of processing In order to prevent corrosion, non-metallic materials can be used; for sulfuric acid, hydrochloric acid and other strong corrosive bath solution, nylon plastic can be used; the nozzle material used for phosphating bath solution is generally acid resistant stainless steel, and the nozzle to prevent corrosion can also be directly made of stainless steel or nylon The nozzle with certain impact force shall be small angle nozzle, with liquid column flow (i.e jet flow) as the best; fan nozzle is suitable for cleaning, degreasing, cooling and other aspects, and cone nozzle is suitable for floating, surface, phosphating, humidifying and dedusting Venturi mixing nozzle shall be installed in paint storage tank and tank body Take "H" type, i.e mixing nozzle (also known as venturi nozzle) as an example, the flow rate of tank liquid is 1:4 together with the liquid inhaled at the approach port through a certain pressure After mixing, the mixture is diffused and ejected to achieve the effect of mixing and stirring the solute without air, so as to prevent precipitation, because the agitation ensures the uniform mixing of chemical solution 4 The arrangement of nozzles is to install several nozzles in a certain arrangement on the circular pipeline composed of the external dimensions of the workpiece, so as to surround the workpiece, so that when the workpiece passes through the spray area, all surfaces can be sprayed by the tank liquid, and the spray area shall be evenly arranged with nozzles to ensure the spraying process time and effect The distance between the nozzle and the workpiece should be within the good diffusion range of Zui jet, so the arrangement of nozzle and nozzle should be reasonable The distance between the nozzle and the nozzle is 250mm-300mm, and the distance Zui between the nozzle and the workpiece shall not be less than 250mm in the case of cross arrangement The mixing device for the pretreatment of impregnated coating consists of a pump, a pipeline and a mixing nozzle, forming a complete tank liquid spraying system The mixing nozzle uses the Venturi principle The tank liquid enters the pipeline under the action of a certain pressure, forms a high-speed jet through the orifice of the mixing nozzle, and creates a low-pressure area around the approach port of the nozzle, forming a siphon phenomenon Under the action of the pressure difference, the tank liquid is sucked into the mixing nozzle, from which a large amount of liquid can be recycled The distance between the mixing nozzle and the bottom of the tank is 25mm-75mm, and the distance between the mixing nozzle and the workpiece is 200mm-380mm The angle of the spray hole shall be determined according to the size of the workpiece When the width of the workpiece is small, the spray hole can be designed to be vertical upward When the workpiece is large, the spray hole can be designed to be 35-45 to the vertical plane When the width of the workpiece is large, to improve the mixing effect, the spray hole can be designed to be vertical downward, but this situation will stir up the sediment, so it is only suitable for the mixing without sediment tank liquid 5 Nozzle quality inspection and common causes of damage the nozzle needs to be repaired, regularly inspected, cleaned or even replaced in order to ensure the quality of Zui end products and maintain the economic benefits of the production process The way and frequency of the repair procedure depends on the purpose The maintenance plan can be arranged according to the use, liquid and nozzle material There are seven common reasons that affect the nozzle spray problem: a) corrosion and wear: the material on the nozzle nozzle and the inner flow channel gradually becomes larger or deformed, thus affecting the flow, pressure and spray shape B) corrosion: chemical action of spray solution or environment causes corrosion and destruction of nozzle materials C) blockage: dirt or other impurities in the liquid block the nozzle orifice, thus limiting the flow of the nozzle and interfering with the spray shape and its uniformity d) Adhesion: splashing, fogging or chemical accumulation on the material inside or outside the nozzle edge caused by liquid evaporation, which can be a dry solidification layer and block the nozzle mouth or internal flow channel e) Temperature damage: overheating will damage the nozzle materials designed for non high temperature applications f) Incorrect installation: washers that deviate from the axis, over tightening or other problems that change the position can have adverse effects g) Accidental damage: during installation and cleaning, the nozzle may be damaged accidentally due to the use of incorrect tools 6 Application field of nozzle 1 Various cleaning machines in automobile manufacturing industry, spray cleaning, atomization spray, tank liquid mixing and other equipment in coating line 2 All kinds of cleaning machines and coating lines in the manufacturing industry of motorcycles, bicycles, refrigerators, washing machines, etc 3 All kinds of cleaning equipment in mechanical processing industry 4 Humidification device in light industry and textile industry 5 Cleaning machine manufacturer, coating equipment manufacturer supporting nozzle 6 Nozzles for agricultural sprinkler irrigation and urban greening Conclusion no matter the nozzle is selected for project design or purchased by users, we hope to find a professional manufacturer with complete varieties and specifications, stable product quality and timely supply Our company is a professional manufacturer of industrial nozzles, powder filter elements and air filters Welcome to our customers
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