The frame assembly is composed of stamping parts (longitudinal beams, cross beams, brackets) and casting brackets. The length of the frame assembly is generally between 5 and 12 m; the product is characterized by large dimensions, large quality, and many varieties; if The production capacity is large, and the requirements for mechanized transportation and product assembly methods are relatively high. In view of this, what are the pre-processing equipment for the frame coating production line?

1. Pre-processing equipment

The pretreatment equipment of the frame coating production line is mainly composed of the chamber body, the working tank, the medicament supplement system (degreaser, meter adjustment, phosphating agent), degreasing system, iron powder removal system, phosphating slag removal system, heat Exchange system (pre-degreasing, degreasing, phosphating), exhaust system, temperature control system, etc. The chamber body is a closed structure, the frame is made of profiles, the wall panel material is 2 mm thick stainless steel plate, the roof of the chamber body is illuminated by fluorescent lamps, and the side walls are equipped with inspection doors and observation windows. The tank body is a fully welded structure, in which the bottom side of the tank is inclined to one side, a discharge port is arranged at the lower part, and all the corners of the tank body are arc-shaped. All tank walls are made of 304 stainless steel. All working tanks are equipped with auxiliary tanks and filter screens. All pipes are made of stainless steel.

The pump used in the phosphating process adopts a double mechanical seal form, and a sealed pump is set accordingly to increase the service life of the pump. The pumps in the remaining processes all adopt a single mechanical seal form.

The working tank is equipped with a stirring device, so that the tank liquid in contact with the surface of the workpiece can be continuously updated to ensure the uniformity of the temperature and concentration of the tank liquid, accelerate the chemical reaction speed on the surface of the workpiece, and improve the quality of pretreatment. The iron dust removal system uses a combination of a hydrocyclone and a magnetic iron dust filter to remove iron dust in the bath. The treated tank liquid automatically returns to the pre-degreasing tank. Set up a special trolley to collect iron dust and transport the iron dust to the outside of the workshop. The phosphating slag removal system consists of a supply pump, settling and separation equipment, a phosphating slag filter press device, and a slagging trolley. It realizes automatic and continuous slag removal and ensures that the slag content of the phosphating bath is less than 3.0 × 10-4. The supply pump adopts a double mechanical seal horizontal pump. Equipped with slag blowing compressed air pipeline and quick-change connector.

2. Forced cold room

The forced cold room is a through-type, composed of a foundation base, a chamber body, a platform, and a ventilation device. The base is welded by channel steel, and the chamber body is welded by galvanized sheet and square steel tube. The square steel pipes are used as the column and beam of the chamber body, and the galvanized sheet is used as the chamber body and the wall panel of the wind box. In winter, if the outdoor air is too cold, the hot air discharged by the exhaust fan can enter the suction port of the blower by adjusting the adjusting gate for the mixing air. After the cold and hot air are mixed, it will be sent to the forced cold room through the medium-efficiency filter. , To avoid condensation when the workpiece is too cold. There are 2 adjustable openings in the suction box at the upper part of the inlet end of the chamber body. When it is working, the hot air overflowing from the drying chamber can be discharged out of the workshop through a forced cooling exhaust fan.