Screw Conveyor,Augers Conveyor,Augers Transport Conveyor,Coal Screw Conveyor Xinxiang Zhenying Mechanical Equipment Co., Ltd , https://www.beltconveyor.nl
Second, the structural characteristics of the link <br> <br> butterfly valve rod structure shown in Figure 1, which mainly consists of drive means, the valve plate, the valve spindle, rod string and other component parts. The opening and closing of the valve is driven by the driving device to drive the main shaft to move the lever mechanism, so as to realize the opening and closing of the valve plate. It can be seen from Figure 1 that the valve plate and its associated components are always surrounded by the medium, whether the valve is open or closed. When the valve is closed, the valve plate will bear all the pressure of the medium, which will cause the plastic deformation of the valve plate, which will cause the linkage pieces to cause deformation. When the valve is opened, the valve plate will be washed by the medium and the medium flow. The resulting vibration of the valve plate itself also accelerates the damage of the linked parts, especially the damage of the solid self-lubricating bearings at the hinges. Therefore, the life of the connecting rod valve plate is the life of the connecting rod butterfly valve.
Third, the connecting rod valve plate structure analysis 
According to the structural characteristics of the connecting rod butterfly valve plate, the casting structure is generally not used in processing and manufacturing. The traditional valve plate is mainly in the form of welding. As shown in FIG. 2, the two vertical plates of the valve plate are directly blanked by the steel plate, and the large round steel plate is blanked. After the need for hot-press forming, a certain degree of arc pressure, and then welded with the vertical plate, and finally machining.
From the perspective of the process, the valve plate of this type of structure is analyzed. It can be seen from FIG. 2 that the valve plate is composed of three parts: a vertical plate, a backing plate, and a large round steel plate. If this type of valve plate is used, the backing plate and the vertical plate can be directly formed by blanking, while the large round steel plate requires the craftsman to first calculate the blanking size, and then press the required arc to make the pressure-shaped tires. The large round steel plate was pressed and formed, and finally welded to the other two pieces. The main problem lies in the step of manufacturing pressure-shaped tyres. It can be seen from Figure 2 that the central part of the valve plate is arc-shaped and the edge is a plane. This requires a valve for every specification and a tyre to be made. With, otherwise you can not press out the required shape. This invisible increases the company's manufacturing costs.
Analysis of this structure using finite element technology, as shown in Figure 3, is the analysis result when 0.4MPa pressure is applied to the valve plate of the traditional structure of the DN1700 connecting rod butterfly valve. It can be seen that the maximum deformation of the entire valve plate is on the two vertical plates. The maximum deformation that occurs at this time is 1.69mm, which will cause great damage to the pins and bushings connected to the valve plate. Figure 4 shows the damage of DN1700 cold air valve of cold air duct of hot blast stove (cold air duct pressure is 0.47 MPa, temperature is 350°C). The reason for this valve damage is that the pin shaft connected to the valve plate is bent, and the pin shaft is from Lubricated bearings are completely crushed. 
Principle Design of Connecting Rod Valve Plate
The connecting rod butterfly valve is a structural form of the butterfly valve. It is mainly used in the pipeline of the hot blast furnace system of the metallurgical blast furnace. It has the advantages of small size, light weight, flexible operation, convenient disassembly and assembly. Therefore, the connecting rod butterfly valve has been widely used in the air, gas, flue gas and other media pipelines of the hot stove system.