Cascaded oil cylinder type acceleration controller

Abstract

The invention relates to a cascaded oil cylinder type acceleration controller for pipe cleaning construction such as detection, liquid drainage and descaling in a pipeline. A technical scheme is as follows: a large oil cylinder and a small oil cylinder are coaxially and oppositely arranged and are connected together through a cylinder block, and a piston of the large oil cylinder and a piston of the small oil cylinder are close to each other and piston rods stretch out from the cylinder block, separately; hydraulic oil in the large oil cylinder and the small oil cylinder communicate to each other, and compression springs are arranged in the large oil cylinder and the small oil cylinder separately; and the piston rod of the large oil cylinder is directly connected to a brake pad or is indirectly connected to the brake pad. According to the cascaded oil cylinder type acceleration controller, the brake pad is driven by the cascaded oil cylinders to work, and action forces of the oil cylinders are amplified by matching the large and small oil cylinders, so that a large enough brake force can be obtained, and therefore, the cascaded oil cylinder type acceleration controller has a good anti-impact effect.

Description

technical field [0001] The invention relates to a series oil cylinder type acceleration controller, which is used for pigging construction such as detection, liquid drainage and descaling in pipelines. Background technique [0002] When the intelligent pig performs internal detection on the pipeline, the speed of the pig needs to be limited to a low range; otherwise, it is easy to cause problems such as inaccurate pipeline detection, impact between the pig and the elbow of the pipeline, etc. Conventional clean pigging operations also require the pig to run slowly, otherwise it is easy to cause problems such as reduced pigging efficiency and medium backflow. However, due to the compressibility of gas, the speed of pigs in natural gas pipelines is prone to large fluctuations. With the development of pipeline non-destructive testing technology, a pig speed closed-loop control technology has emerged, which mainly uses a servo motor to control the bypass valve in real time, and ...

AI Technical Summary

Problems solved by technology

[0010] Purpose of the present invention: in order to overcome the sudden change in the resistance of the pig in the gas pipeline and the problem of speed impact when entering the downhill section of the pipeline; to overcome the slipping of the mileage wheel in the existing pig braking scheme and the comparative braking force based on speed feedback Limited, it is difficult to adapt to problems such as drastic changes in pig acceleration

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