Constant speed section consistency control method and system for coating product line for three-layer PE (polyolefin) steel pipe

Abstract

The invention discloses a constant speed section consistency control method and a control system for a coating product line for a three-layer PE (polyolefin) steel pipe and belongs to the control field for three-layer PE steel pipe manufacturing equipment. The constant speed section consistency control method is characterized by comprising the following steps that 1, program starts operating; 2, hardware is initialized; 3, communication protocol is set; 4, axial speed of the steel pipe is calculated; 5, the expectation rotational velocity of a driving rubber wheel (3) is calculated through main ring PI computation; 6, the rotational velocity of the driving rubber wheel (3) is calculated; 7, the output frequency of a transducer (4) is calculated through auxiliary ring PI computation. A controller is simultaneously connected with multiple groups of transmission mechanisms through a data conversion interface (6) and a data transmission bus (5), and each group of transmission mechanisms act on the steel pipe (1) to realize transmission of the axial movement of the steel pipe (1). The constant speed section consistency control method and the control system for the coating product line for the three-layer PE (polyolefin) steel pipe solve the problem that the rotational velocity consistency control of the driving rubber wheel and the axial speed control of the steel pipe cannot be realized in the constant speed section of the coating product line for three-layer PE steel pipes in the prior art, and the rotational velocity of the driving rubber wheel and the axial speed of the steel pipe are kept in accordance with the values required by technological requirements.

Description

technical field [0001] The invention discloses a uniform control method and system for a uniform speed section of a three-layer PE steel pipe coating production line, belonging to the field of three-layer PE steel pipe manufacturing equipment control. Specifically, it involves solving the problem of consistent control of the rotational speed of the active rubber wheels and the axial speed of the steel pipe in the uniform speed section of the three-layer PE steel pipe coating production line, so that the rotational speed of each active rubber wheel and the axial speed of the steel pipe are stable at the value required by the process. Background technique [0002] Three-layer PE anti-corrosion steel pipe is an important way for the transportation of petroleum and petrochemical products such as natural gas and refined oil. The quality of the three-layer PE anti-corrosion layer is one of the key factors restricting the life of this type of pipeline. There are two forms of three...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, and to provide a solution to the uniform control of the rotating speed of the active rubber wheel and the control of the axial speed of the steel pipe that cannot be realized in the uniform speed section of the three-layer PE steel pipe coating production line in the prior art The problem is to stabilize the speed of each active rubber wheel and the axial speed of the steel pipe at the value required by the process. The uniform control method and system for the uniform speed section of the three-layer PE steel pipe coating production line

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