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    Home > Coatings News > Paints and Coatings Market > Technology of vertical powder spraying production line for aluminum profile

    Technology of vertical powder spraying production line for aluminum profile

    • Last Update: 2020-03-25
    • Source: Internet
    • Author: User
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    Powder spraying is a kind of dry surface treatment procedure After electrostatic treatment, very fine pigment particles are sprayed on the product to form a coating, which is solidified in the curing furnace to form a solid coating Powder spraying has the following features: 1) beautiful surface, durable, scratch resistant, chemical contact resistant, UV resistant; 2) environmental protection, no waste discharge; 3) perfect corner coverage effect; 4) uniform color, wide spraying color range; 5) easy to control thickness, so it is widely used Powder coating and coating began in the late 1930s At first, the polyethylene powder was applied to the metal surface in molten state by flame spraying, which was the beginning of powder spraying Until the 1950s, after the invention of sulfurization bed dip coating method for powder in Germany, powder coating and coating process had been greatly developed Powder coating started late in China In 1989, Jiangsu Changzhou Huayi aluminum profile factory introduced us nuoxin powder coating equipment, which is the first one in China However, with the economic reform and opening up, powder coating technology has developed rapidly in China In the early days, horizontal production lines were used, but with the development of economy and technology, Italy and Japan first launched vertical spray production lines and began to be widely used The vertical powder spraying production line has developed into a mature product The uniformity of the previous treatment from soldering, drying to powder spraying coating and the curing effect have reached the advanced level in foreign countries Due to the small floor area of the vertical line and the small number of operators, the uniformity of powder spraying and the curing layer have reached the perfect effect II Process composition of vertical powder spraying production line vertical powder spraying production line is mainly composed of pre-treatment, feeding and unloading conveying system, powder spraying system, powder recovery system, curing and drying part and automatic control part The working process is mainly divided into: pretreatment → putting on the shelf → spraying → curing → unloading → packaging 1) the pre-treatment of external treatment is mainly to clean the stains on the surface of aluminum profile, and form a layer of chrome film on the surface, so as to do the preliminary work for powder spraying Process flow: basket loading → degreasing → water washing → (alkali corrosion) → water washing → surface adjustment (neutralization) → water washing → chromizing → water washing → hot (pure) water washing → drip drying → drying → spraying and putting on the shelf Among them: the concentration of degreasing, alkali corrosion, surface regulation and chromizing agent is based on the concentration provided by the supplier Ordinary tap water is used for washing tank Use pure water for hot water washing (alkali corrosion can not be used) tank structure: degreasing tank: it is mainly used to clean the surface stains of aluminum profiles, so as to prevent the adsorption of electrostatic powder by oil stains on the surface of aluminum profiles The tank body is made of soft PVC, the main component of the tank liquid is sulfuric acid, and the temperature is normal temperature The tank size depends on the length and output of the maximum profile Water washing tank: clean the chemical residues of the last process tank The tank body is made of soft PVC, the main component of the tank liquid is tap water, and the temperature is normal temperature The tank size depends on the length and output of the maximum profile Surface regulating tank (neutralization): neutralize the acid left in the degreasing tank The anticorrosion of tank body is soft PVC, the main composition of tank liquid is, and the temperature is 10-60 ℃ The tank size depends on the length and output of the maximum profile Chromizing tank: chemical conversion to prevent the electrostatic powder from falling off There are two methods: chromizing and phosphating These two methods have been used for many years, with stable performance and easy operation in production The conversion effect can be distinguished according to the color after treatment Among them, the aluminized film is yellow, and the phosphorous chromized film is green The operating temperature and time range of these two processes are wide, and the coating is wide The thickness is generally 0.3-0.8g/m2 Soft PVC is used for anticorrosion of chrome tank The main component of tank solution is fluozirconate or fluotitanate, and the temperature is 25-55 ℃ The tank size depends on the length and output of the maximum profile Hot water washing tank: after chromium treatment process, its anticorrosion adopts all stainless steel structure, the tank liquid composition is pure water tank temperature control of 60-80 degrees Its temperature control can be heated by hot water furnace or steam Drying furnace: dry the chromium film after chromium, so that there is no residual water on the surface If there is water left on the surface of the workpiece to enter the powder spraying process, the coating will produce bubble defects The drying temperature should not be too high, otherwise the converted film will lose too much crystal water and transform, resulting in the film loose and the adhesion of the coating decreased The heating of the drying furnace can be based on the needs of different customers using gas combustion engine or diesel combustion engine The target temperature can be set by temperature control system The furnace body adopts stainless steel structure 2) the loading and unloading conveying system is composed of two parts: chain conveying and loading and unloading conveying belt, which plays a connecting role in the whole system, and the three conveying belts keep synchronous during automatic operation The chain conveyor belt is an electromagnetic adjusting device, and the feeding and unloading conveyor belts are controlled by the same frequency converter The synchronous adjustment is carried out after the feedback signal sampling operation of the rotary encoder The main function of loading and unloading conveyor belt is to form a smooth transition from horizontal to vertical when loading aluminum profiles In order to prevent aluminum from swinging and scratching It has a 40 degree angle with the conveyor chain, and the operation speed of the feeding and unloading and the conveyor chain are precisely calculated by PLC to ensure the synchronization of the three in space Main composition: the conveyor belt is driven by a motor, and the conveyor belt is equipped with anti-skid baffles to ensure that the aluminum materials can be put on and off the rack in order and stably The conveyor chain is moved by a universal conveyor chain with aluminum profile to the designated rail The length of the whole chain is 100-150m, which can withstand high temperature The running speed is related to the number of spray guns and the thickness of powder spraying Generally, the running speed of the conveyor chain is 1.5-2m/min when there are 12 spray guns on one side 3) powder spraying system is the core part of the whole production line: it is mainly composed of two reciprocating machines with adjustable upper and lower stop and adjustable speed as well as powder spraying system Reciprocating machine: its height is related to the maximum profile length sprayed by the customer The spray gun is installed on the mobile platform of the reciprocating machine, and the mobile platform moves up and down according to the linear guide rail The schematic diagram is shown in the figure The adjustment of the upper and lower dead center is fed back by the encoder to the PLC to calculate the pulse positioning, and the adjustment accuracy is 1mm The position of the upper and lower dead center can be set through the touch screen or the upper computer The operation speed is input to the frequency converter by potentiometer adjustment, and the speed adjustment range is 0Hz ~ 50Hz (0m / S ~ 8m / s), which is adjusted according to the actual thickness of powder spraying required by the customer High voltage electrostatic spray gun and universal spray gun controller: imported Gemma automatic high voltage electrostatic spray gun equipped with integrated electrostatic high voltage generator is the core of powder spraying equipment It is the most important part to spray powder on the workpiece Daily maintenance is very small, and equipped with discharge needle cleaning system of electrode base, which can guarantee stable and efficient powder charging effect and continuous and stable powder output The universal spray gun controller of Swiss Jinma automatic high voltage electrostatic spray gun provides a friendly user interface, which can realize the repeated setting of control parameters, thus obtaining excellent spray effect The advantage of the controller is that it can achieve repeatable spraying results at any time All spraying parameters (spraying voltage, spraying current, transmission air and cleaning air of electrode holder) can be accurately set for a long-term powder charging condition respectively All spray guns have uniform powder and uniform coating surface In addition, 255 separate spraying programs are stored in the controller and can be called at any time The universal spray gun controller can be used in combination with optional Optiflow to realize the measurement and adjustment of the transmitted air and auxiliary air Digital bus data bus module can exchange data with PLC The function of the cyclone recovery device is to separate the recovered powder in the transmission air The air powder mixture extracted from the spray chamber is sent to the cyclone separator The mixture forms a rotating air flow downward, and the heavier powder particles are centrifugally thrown onto the wall of the cyclone separator, and then fall onto the lower powder screen On the powder screen, impurities are screened out, and the qualified powder is re entered into the powder circuit for further use The cyclone separator is more suitable for the use of rapid color change spraying 4) the workpieces of curing furnace must be leveled and solidified in the baking furnace as soon as possible after spraying to prevent dust and other impurities from adhering and falling off and affecting the coating quality The curing furnace is heated by two Swedish Baitong burners, with natural gas (or liquefied petroleum gas) as the fuel Taking a vertical production line with an annual output of 15000 tons and a maximum profile length of 7.5 meters as an example, the internal space of the curing furnace is designed to be 200 M3 with a heating rate of about 15-20 minutes at room temperature to 180 ℃ There are four temperature sampling points, which can monitor the temperature in the furnace at any time, or make curve analysis with the upper communication, and record the report for filing Each two temperature control points control a combustion machine to ensure the temperature uniformity in the furnace Air curtains are set at the inlet and outlet of the furnace body to ensure the heat loss in the furnace 5) the control part of the automatic vertical powder spraying production line of the automatic control system is mainly composed of pretreatment, conveying system, powder spraying system and curing furnace PLC is used for intelligent control, online monitoring and operation with touch screen, online remote and local monitoring, data acquisition and analysis, curve archiving and report generation with upper computer system In addition, the spray gun controller can select the communicable type and add the upper computer to monitor the operation according to the customer's requirements The whole line control system diagram pretreatment aluminum profile surface moisture drying, provide hot water The temperature in the drying oven is controlled by a combustion machine and a temperature controller, which can monitor the temperature of the bath liquid, and the collected temperature can be archived in the upper computer The conveyor system consists of two parts: chain conveyor and loading and unloading conveyor belt, which plays a connecting role in the whole system The three conveyor belts keep synchronous in automatic operation The chain conveyor belt is an electromagnetic adjusting device, the feeding and unloading conveyor belt is controlled by the same frequency converter, and the synchronous adjustment is carried out after the feedback signal sampling operation of the rotary encoder The running line speed of the conveyor belt can be displayed on the touch screen or the upper computer, and the main conveyor belt can be adjusted by the electromagnetic governor The powder spraying system is the core part of the whole production line, which is composed of two up and down reciprocators Its running speed and the position of the up and down stop may be adjusted by the potentiometer operated on site Through PLC operation, the rotary encoder is used as the upper and lower dead center position feedback, and the frequency converter performs the operation process With upper and lower limit, overload and other protection The curing furnace is a post-treatment, and the temperature in the furnace is heated by two burners The temperature in the furnace is controlled by sampling four temperature control points The temperature controller can communicate with PLC, and the temperature can be set on the temperature controller Solidify and level the sprayed material at the set temperature 3 The vertical powder spraying production line has been recognized by many manufacturers in China due to its various advantages  
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