The Coating Line Introduction

The coating line is a popular product in the assembly line market. The seven components of the coating line mainly include: pre-treatment equipment, dusting system, painting equipment, oven, heat source system, electronic control system, suspension conveyor chain. Wait. It is suitable for painting and plastic spraying on the surface of workpieces. It is mostly used for the painting of single or small batches of workpieces. It is combined with the transportation machinery such as hanging conveyors, electric rail cars and ground conveyors to form transportation operations.

table of Contents

1 component

▪ Pre-processing equipment

▪ Powder spraying system

▪ Painting equipment

▪ Oven

▪ Heat source system

▪ Electronic control system

▪ Suspended conveyor chain

2 Application characteristics

3 Frequently Asked Questions

4 Process

component

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The seven components of the coating line mainly include: pre-treatment equipment, dusting system, painting equipment, oven, heat source system, electronic control system, suspension conveyor chain and so on.

Pre-processing equipment

The spray type multi-station pre-treatment unit is a commonly used equipment for surface treatment.

Painting line coating line

The principle is to use mechanical scouring to accelerate the chemical reaction to complete the process of degreasing, phosphating, washing and the like. Typical processes for steel spray pretreatment are: pre-degreasing, degreasing, water washing, water washing, surface conditioning, phosphating, water washing, water washing, and pure water washing. Pre-treatment can also use shot blasting machine, suitable for steel parts with simple structure, serious corrosion, no oil or less oil. And no water pollution.

Dusting system

The small cyclone + filter recovery device in powder coating is a more advanced powder replacement device with faster color change. The key parts of the dusting system are recommended to use imported products, and the parts such as the powder spraying room and the electric mechanical lift are all localized.

Painting equipment

Such as oil spray spray booth, water curtain spray booth, can be widely used in the surface coating of bicycles, automotive leaf springs, large loaders.

Oven

Oven is one of the important equipment in the coating production line, and its temperature uniformity is an important indicator to ensure the quality of the coating. The heating method of the oven includes: radiation, hot air circulation and radiation + hot air circulation, etc. According to the production program, it can be divided into single chamber and pass type, and the device form has a straight-through type and a bridge type. The hot air circulation oven has good heat preservation, uniform temperature inside the furnace and less heat loss. After testing, the temperature difference in the furnace is less than ±3oC, which can reach the performance index of similar products in advanced countries.

Heat source system

Hot air circulation is a common heating method. It uses the principle of convection conduction to heat the oven to achieve drying and solidification of the workpiece. The heat source can be selected according to the user's specific conditions: electricity, steam, gas or fuel. The heat source box can be set according to the condition of the oven: placed on the top, bottom and side.

Electronic control system

The coating and coating line electrical control has centralized and single row control. The centralized control can use the programmable logic controller (PLC) to control the host, and automatically control each process according to the programmed control program, data acquisition and monitoring alarm. Single-row control is the most commonly used control method in the coating production line. Each process is controlled by a single column. The electric control box (cabinet) is placed near the equipment, which is low in cost, intuitive in operation and convenient in maintenance.

Suspension conveyor chain

The suspension machine is the conveying system of the industrial assembly line and the coating line. The accumulation type suspension machine is applied to the storage shelf of L=10-14M and the coating line of the special-shaped street lamp alloy steel pipe. The workpiece is hoisted on a special rack (loading capacity of 500-600KG), the entrance and exit are smooth, and the switch is opened and closed by electrical control according to the work instruction to meet the automatic conveying of the workpiece at each processing station, in the strong cold room and the lower part area. Parallel accumulation of cooling, and set up the rack identification and traction alarm stop device in the strong cold area.

Application characteristics

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The coating line equipment is suitable for painting and spray coating on the surface of the workpiece. It is mostly used for the painting of single or small batch workpieces, and is used for transportation operations such as hanging conveyors, electric trolleys and ground conveyors.

Engineering process layout:

1, spray line: the upper conveyor chain - spray - drying (10min, 180 ° C -220 ° C) - cooling - the next piece

2, painting line: the upper conveyor chain - electrostatic dust removal - primer - leveling - topcoat - leveling - drying (30min, 80 ° C) - cooling - the next piece

common problem

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What information and parameters should I provide when ordering a coating line?

1. The maximum product of the whole machine is equivalent to the workpiece specifications: length, width, height and weight;

2. Product raw material name, material thickness and hanging method;

3. What is the annual output, annual working day, and daily working hours?

4. Whether the surface has oil or not;

5. Whether the surface has rust or not;

6. The coating process to be used is powder spraying, painting or dipping, cathodic electrophoresis, anodic electrophoresis, etc.;

7. What color, color change cycle, film thickness and type of paint should be sprayed on the workpiece;

8, production form: automatic / intermittent;

9. Overview of the proposed coating energy: electricity (KW), steam (T/h), tap water (T/h), compressed air (M3/min), thermal energy in the form of fuel or gas;

10. The actual area and effective height of the plant can be used.

Process flow

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The coating production line process is divided into: pre-treatment, powder coating, and heat curing.

Production of the pre-treatment section of the coating line

The pre-treatment has a manual simple process and an automatic pre-treatment process, and the latter is divided into two processes: automatic spray and automatic dipping. The workpiece must be surface treated to remove oil and rust before dusting. There are many liquid medicines used in this section, mainly including rust removers, degreasers, surface conditioners, phosphating agents, and the like.

In the pre-treatment section or workshop of the coating production line, the first thing to pay attention to is to develop the necessary system for the purchase, transportation, storage and use of strong acid and alkali, to provide workers with the necessary protective clothing, safe and reliable handling, handling and configuration equipment, and Formulate emergency measures and rescue methods in the event of an accident. Secondly, in the pre-treatment section of the coating production line, since there are a certain amount of waste gas, waste liquid and other three waste materials, it is necessary to arrange the exhaust gas exhaust, liquid discharge and three waste treatment devices in terms of environmental protection measures.

The quality of the pre-treated workpieces is different due to the different process flow of the pre-treatment liquid and the coating production line. To deal with better workpieces, the surface oil and rust are exhausted. In order to prevent rust again in a short time, it is generally necessary to carry out phosphating or passivation treatment in several processes after pretreatment: before the dusting, the phosphorus should be added. The workpiece is dried to remove moisture from its surface. Small batch production, usually dry, dried and air dried. For large-scale flow operations, low-temperature drying is generally adopted, and an oven or a drying tunnel is used.

Spray-coated tissue production

For small batches of workpieces, manual dusting devices are generally used, while for large batches of workpieces, manual or automatic dusting devices are generally used. Whether it is manual dusting or automatic dusting, it is very important to keep the quality off. It is necessary to ensure that the sprayed workpiece has uniform powder and uniform thickness, and prevents defects such as thin spray, leakage spray, and rubbing.

In the coating production line, this process should also pay attention to the hook part of the workpiece. Before entering the curing, the powder attached to it should be blown off as much as possible to prevent the excess powder on the hook from solidifying. Some remove the residual powder before curing. If there is any difficulty, the cured film on the hook should be peeled off in time to ensure that the hook is well conductive, so that the next batch of workpieces is easy to be powdered.

Coating production line curing process production

The items that should be paid attention to in this process are: sprayed workpieces. If it is a small batch of single-piece production, please pay attention to prevent the powder from falling off before entering the curing furnace. If there is dusting phenomenon, the powder should be sprayed in time. Strict process, temperature and time control during baking, pay attention to prevent chromatic aberration, over-bake or too short time to cause insufficient curing.

For large-volume automatic conveying of the workpiece, it is also necessary to carefully check whether it is leaking, spraying or partial dusting before entering the drying tunnel. If unqualified parts are found, it should be closed to prevent entering the drying tunnel and remove the heavy spray as much as possible. If individual workpieces fail due to thin spray, they can be re-sprayed and solidified after curing the drying tunnel.

By coating, it is meant to cover the metal or non-metal surface with a protective or decorative layer. The coating line has undergone a development process from manual to production line to automatic production line, and the degree of automation is getting higher and higher. Therefore, the application of the coating production line is more and more extensive, and it has penetrated into many fields of the national economy.