Multi-cyclone recycling system for powder coating equipment
Electrostatic spraying of powder coatings has entered the application field since the 1960s, and has been rapidly popularized throughout the world, and has become more and more popular. However, with this spraying method, due to the discontinuity of the workpiece during the spraying process, the quality of the powder itself, and the influence of the spraying stroke, some powders are not fully utilized. If this part of the powder is not collected in a timely manner, it is easy to pollute the environment; if it is treated as waste powder, the waste is too large; if it is used for repeated use, it contains a lot of unusable waste powder which will affect the coating quality. This requires a device to collect and separate them, separate the available parts from the unavailable parts, and process them separately. The function of the powder recovery device is to collect the powder dropped in the spraying process, separate it into usable powder and unusable waste powder, and send them to the corresponding devices respectively. However, in actual use, due to the influence of various factors such as equipment manufacturing and technology, the recovery device always has these or other shortcomings. Therefore, people have been looking for an ideal powder recovery system to solve the problem of powder recovery during spraying. This article introduces a multi-cyclone powder recovery system.
Multi-cyclone powder recovery system: This device can be divided into four parts: suction section, separation section, filtration section and discharge section. The suction section consists of a freely adjustable air plate, an adjustment system and an air outlet. Its role is to suck powder dust or unused powder floating in the air from the spraying room into the separation system to separate it. Adjust the adjustment system according to the specific conditions during operation. Adjust the air intake of the population by changing the size of the air outlet to improve the environment and collect dust and powder. The air outlet should be adjusted according to the height of the spray booth, the relative height of the workpiece from the air outlet, and the linear distance. to make sure. If the air outlet is too close to the workpiece, the powder loading rate of the workpiece is often not high due to the exhaust air, and the powder consumption is too large; on the other hand, if the air outlet is too small, it is not easy to extract the dust in the spraying room in a timely manner, and the spraying working environment is worse .
The separation section consists of a cyclone separation cylinder, a filter screen and an air inlet and outlet. Its function is to use a specific cyclone separation cylinder device to make the available powder enter the original powder box and mix with the original powder, and then enter the spraying cycle again, while another part of the powder with small particles is difficult to adsorb electrons in the spraying electric field. It is charged, so it is basically impossible to be coated on the workpiece, which is called waste powder. If these waste powders are continuously added to the original powder without timely separation, the amount of available powder in the original powder will be reduced, and the effective powder sprayed per unit time will be less and less, resulting in a greater film thickness of the sprayed workpiece. Coming thinner. On the other hand, if these waste powders enter the spraying cycle together with the original powders, in order to obtain qualified workpieces, it is necessary to continuously adjust the process parameters and increase the amount of powder output per unit time. After a series of devices, the waste powder runs very fast in it, which increases the wear of the equipment and seriously affects the service life of the equipment. Therefore, this part of waste powder should be separated as much as possible, and can no longer participate in the spraying cycle. This process is completed in the separation section. The key equipment here is the cyclone separator. The device is a cyclone structure with an internal involute shape. When the airflow enters the device, it will change its direction to form a vortex shape. The combined action of centrifugal force and gravity causes the powder in it to be efficiently separated during rotation.
The powder and gas mixture coming out of the separation section enters the filtering section, which is composed of a filtering chamber, a waste powder collecting box and a clean gas system. Its functions are as follows: the filter chamber is composed of a set of filter elements and their accessories, and its main function is to filter the mixed gas coming from the front. The filter element is made of a special material with high strength and micropores. The micropores can allow gas to pass through, but the powder cannot, but over time, there will be many fine powders sticking to the surface of the filter element, blocking the micropores of the filter element, on the one hand, it will lose the filtering effect, and on the other hand, the system The internal air flow is not smooth, which increases the resistance of the exhaust fan, which may easily cause the fan to be overloaded and damaged. So this requires a clean air system, which is a freely adjustable pulse air system. If its pulse period is adjusted to 5s, it will send out an airflow from the inside of the filter element to the filter element every 5s, so that the powder adhered to the outside of the filter element falls into the powder collection box for easy collection. At the same time, the pulse period and airflow intensity can be adjusted according to the actual production conditions to achieve the best recovery effect. Here, the filter element and pulse gas are more critical. If the filter element is not good, it will easily cause the filter to be unclean, and the discharged fine powder will enter the atmosphere, which will affect the surrounding environment. In severe cases, it will cause the local dust concentration to be too high and cause an explosion.
The discharge section is composed of a fan, an air duct and a filter screen. The fan is used to exhaust air, and it is also the driving force of the air flow in the entire system; the air duct determines the wind direction; the filter is the last protection to make the air flow entering the atmosphere as clean as possible.
Compared with other types of recovery systems, the advantages of the multi-cyclone powder recovery system are: its multi-stage structure and separation of settings ensure that the mixture can be quickly and thoroughly separated after entering. Its unique multi-cyclone separator and filter element made of special materials ensure high separation efficiency and good effect. The sections cooperate with each other and are separated from each other. The key is the coordinated work of the cyclone separator, filter element and backflushing pulse gas system, which not only ensures the high quality of recovery and separation, but also ensures the normal operation of the spray booth. The promotion and popularization of this system will greatly improve the efficiency of powder recovery, improve the quality of spraying and improve the environment.