Valve mechanical linkage system

Abstract

The invention belongs to the technical field of mechanical engineering, and in particular relates to a valve mechanical linkage system. The system comprises a gear, a rack, a cam, a flexible coupling,a main valve body, a main valve bracket, a main valve actuator, a main valve movement assembly, a main valve coupling, an auxiliary valve body, an auxiliary valve bracket and an auxiliary valve movement assembly. The system adopts a rack-and-pinion type main valve drive structure, a variable cam type auxiliary valve drive structure and a main and auxiliary valve linkage structure connected by theflexible coupling between a main valve and an auxiliary valve. The main valve and the auxiliary valve are connected by the coupling, and respective mechanisms are fixed on the corresponding valve brackets and are not mutually affected.

Description

technical field [0001] The invention belongs to the technical field of mechanical engineering, and in particular relates to a valve mechanical linkage system. Background technique [0002] In major ethylene plants, ethylene cracking furnace is the key equipment for producing ethylene. Pyrolysis gas valve and coke cleaning valve, as shut-off valves for cracking furnace and coke cleaning pipeline, play an extremely important role, and their performance is related to the production safety of the entire plant. Among them, the cracking valve is used to cut off the cracking furnace and the cracking gas main pipeline, and the coke cleaning valve is used to cut off the cracking furnace and the coke cleaning pipeline. When the cracking furnace switches between the process mode and the coke cleaning mode, if there is no If the actions are performed in the correct order, the pyrolyzate may flow back into the coke cleaning tube and cracking furnace, block the cracking gas pipeline, and...

AI Technical Summary

Problems solved by technology

Since the main and auxiliary valves share a double-slotted linkage, in order to achieve precise control, the traces of the rollers where the two valves are linked must be strictly accurate and their relative deviation from the rotation axis must not be too large. It is very high; and if there is a deviation in the neutrality or position accuracy, it will also affect the transmission, so the installation and positioning accuracy is required to be high; moreover, because the length of the driving force arm and the resistance arm is always changing when the main and auxiliary valves are switched, so The depiction of the slotting trace of the auxiliary valve is very complicated, and its curvature is always changing, which brings great inconvenience to both design and manufacture

[0006] 2) Susceptible to pipeline stress

Because the linkage parts connecting the main and auxiliary valves are integrated, that is, the main and auxiliary valves are rigidly connected, once the valve position changes or the valve body is deformed, the shape and position tolerance between the transmission roller and the groove will be greatly increased, which will directly affect When the transmission accuracy is reached, the transmission roller and the linkage parts are completely disengaged, and the linkage system fails.

[0007] 3) According to the above article, even if the valve is only slightly deformed, it will not cause the transmission instability, but the mating surface between the roller and the linkage will change, which will cause excessive wear on the transmission roller surface, which will affect the transmission. its service life

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