Development of a new type plate chain conveyor for painting and drying

On the steel pretreatment conveyor line, the section steel or plate needs to be shot blasted to remove rust, and then spray painted and dried. From the painting room to the drying room, the lower surface of the workpiece is in contact with the carrier during the transfer process, and the paint film on the lower surface will inevitably be damaged to varying degrees. This is an important topic in the development of plate chain conveyors. In the past, the workpiece was conveyed by a raceway. The workpiece is transported by the raceway. If there are n rollers on the raceway, the paint film on the lower surface of the workpiece will be destroyed by the rollers n times along the entire length during the transportation process. Therefore, although the roller is processed with grooves and the supporting surface of the roller on the workpiece is reduced, it still causes serious damage to the paint film on the lower surface of the workpiece, and the lower surface of the workpiece has to be repainted. Currently, plate chain conveyors are commonly used to transport workpieces. Because the plate chain loading conveyor runs on the workpiece, the load-bearing member and the workpiece only touch once. Compared with the raceway, the damage to the paint film on the lower surface of the workpiece by the load-bearing parts is reduced. However, judging from the effect of the use of plate chain conveyors on the steel pretreatment line of domestic manufacturers, some of them are not ideal. The injury is still serious. 1. The structure of the conveyor chain and its accessories of the plate chain conveyor (1) Scheme selection After investigation and investigation by relevant domestic manufacturers, the structure design schemes of the conveyor chain and its accessories can be summarized into three types. ①Scheme 1: The attachment of the conveyor chain adopts a single-sided bent attachment plate type, which is a standard part. The load-bearing beam is above the conveyor chain and its accessories. The weight of the workpiece is mainly related to the degree of the conveyor chain, and the load-bearing part is placed on the load-bearing beam connected with the chain attachment. The working side and return side of the conveyor chain and the rollers of the chain all run on the raceway. The steel pretreatment conveyor line imported from the UK adopts this scheme. ② Option 2: The attachment of the loading conveyor chain adopts the double-sided bent attachment plate type, which is also a standard attachment. The load beam is also on the conveyor chain and its accessories. The difference from scheme 1 is that the conveyor chain of this scheme only has a traction function, that is, it only bears transmission tension, and the weight of the workpiece is borne by the rollers at both ends of the load beam. The working side of the conveyor chain and the rollers at both ends of the load beam run on the raceway. The steel pretreatment conveyor line imported from Germany and Japan adopts this scheme. ③ Scheme 3: The attachment of the loading conveyor chain is an enlarged outer chain plate, and the load-bearing beam and the outer chain plate are welded together. The weight of the workpiece is mainly borne by the conveyor chain and placed on the load-bearing beam welded to the outer chain plate. The working side and return side of the conveyor chain and the rollers of the chain all run on the track. The domestic steel pretreatment conveyor line adopts this scheme. Comparing the degree of damage to the paint film on the lower surface of the workpiece during the conveying process, scheme 3 is the best, followed by scheme 1, and the worst is scheme 2. 2. The power element motor reducer is driven by a short pitch precision roller chain for transmission The conveyor chain is running. Figure 1 Motion characteristics of chain transmission 3. Main, driven sprocket and its supporting shaft The driving sprocket and its supporting shaft are the power input ends of the chain. The driven sprocket and its supporting bearing are subjected to a small torque or even no torque, and it mainly maintains the chain from a certain degree of tension. In order to adjust the center distance of the main and driven shafts when the chain wears out and grows, a tension adjustment device is also attached. In addition, the base steel frame of the conveyor is made of channel steel. Through the development of a new type of plate chain conveyor for painting and drying, the plate chain conveyor can be designed for the future, and the following principles can be determined in terms of reducing the damage of the load-bearing parts to the surface paint film of the workpiece: (1) Each load-bearing part and the workpiece are in the transfer process Only contact once; (2) Try to reduce the contact area of u200bu200beach bearing member with the workpiece; (3) Try to make the apex of the bearing member lie on the sprocket pitch circle when it makes a circular motion around the sprocket.

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