Transmission mechanism of periodical cold-rolling pilger mill

Abstract

The invention discloses a transmission mechanism of a periodical cold-rolling pilger mill and belongs to the technical field of cold-rolling pilger mills. The transmission mechanism is characterized in that a bicrural connecting rod is hinged with the other six connecting rods to form a seven-connecting-rod structure; the seven-connecting-rod structure is hinged to a piston rod in a servo hydraulic cylinder and a rack of the rolling mill; the piston rod is driven by the servo hydraulic cylinder to move telescopically to drive the seven-connecting-rod structure to move, and thus the rack of the rolling mill is driven to move in a reciprocating mode to meet the rolling work requirement. The transmission mechanism has the advantages that 1, the transmission mechanism is stable in work and simple in structure, the weight is lowered, and the investment cost is greatly reduced; 2, the inertia force and inertia moment produced by the connecting rods and the rack can almost be balanced completely, and the effective utilization rate of electric energy is high; and 3, the transmission mechanism is suitable for periodical cold-rolling pilger mills of super-huge sizes, large sizes, middle sizes and small sizes.

Description

technical field [0001] The invention belongs to the technical field of cold-rolled pipe mills, and in particular relates to a main transmission mechanism of a periodic cold-rolled pipe mill. Background technique [0002] After more than ten years of rapid development, China's seamless steel pipe industry has become the world's largest producer and consumer of seamless steel pipes, and its annual output has remained stable at around 70% of the world. Up to now, China has built more than a thousand advanced seamless steel pipe production lines of various types, with a total production capacity of 45 million tons, of which cold-rolled seamless steel pipes are mainly cold-rolled pipe mills, and the annual number of periodic cold-rolled pipe mill units increasing at a greater rate. [0003] At present, the main transmission mechanism of most of the periodic cold-rolled pipe mills at home and abroad adopts the crank-link mechanism, and the inertial force and The moment of inerti...

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Problems solved by technology

[0003] At present, the main transmission mechanism of most of the periodic cold-rolled pipe mills at home and abroad adopts the crank-link mechanism, and the inertial force and The moment of inertia on the crank shaft, the disadvantage of this balance mechanism is that the structure is relatively complicated, installation and maintenance are inconvenient, the weight of the fan-shaped balance weight and the weight accounts for about 70% of the weight of the entire rolling mill, and the energy consumption is large and the cost is high. ; and this balance mechanism needs to build a deep pit, which is expensive and difficult to construct

[0004] Another kind of balance mechanism uses a planetary gear crank transmission mechanism to drive and balance the inertial force and moment of inertia. The disadvantage of this mechanism is that the balance connector can only be designed as one piece, so the weight is limited, and the inertial force that can be balanced is also very limited, so only It can be applied to ultra-small and small cold-rolled pipe mills with very light working frames. Even so, the weight of the balance mechanism accounts for about 50% to 60% of the weight of the entire rolling mill, and the cost is relatively high.

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