Hydraulic control system for lifting oil cylinder of under-pressure operation machine

Abstract

The invention provides a hydraulic control system for a lifting oil cylinder of an under-pressure operation machine. The hydraulic control system comprises a main reversing valve, a descending brake valve, an ascending brake differential valve, the lifting oil cylinder, a pilot handle, a remote pressure regulating valve, a differential selection valve and a pressure reducing valve. A hydraulic oiltank is connected with a hydraulic pump, the hydraulic pump is connected with the main reversing valve and the pressure reducing valve, the pressure reducing valve is connected with the pilot handleand the differential selection valve, the pilot handle is connected with the main reversing valve, the main reversing valve is connected with the descending brake valve and the ascending brake differential valve, the descending brake valve and the ascending brake differential valve are both connected with the lifting oil cylinder, the main reversing valve and the ascending brake differential valveare both connected with the hydraulic oil tank, the differential selection valve is connected with the ascending brake differential valve, and the remote pressure regulating valve is connected with the main reversing valve. The hydraulic control system for the lifting oil cylinder of the under-pressure operation machine is low in manufacturing cost and short in cargo period, has multiple functions of reversing, braking, differential motion, pressure regulation and the like, is low in maintenance and repair cost, and can be suitable for various complex well conditions.

Description

technical field [0001] The invention relates to the technical field of hydraulic control, in particular to a hydraulic control system for a lifting cylinder of a working machine with pressure. Background technique [0002] The snubbing machine is a new type of workover equipment, which is specially used for lifting and lowering the tubing string in oil, water and gas wells when there is pressure in the casing annulus. In order to improve the recovery rate of oil, water and gas wells, and protect underground oil and gas resources and the environment to the greatest extent. All major oil fields have widely promoted snubbing machines. [0003] The hydraulic control system of the lifting cylinder of the belt working machine is used to control the reversing, braking, differential, pressure adjustment and other functions of the lifting cylinder, and is the core system of the belt working machine. The system consists of 7 hydraulic control valves connected through hydraulic pipel...

AI Technical Summary

Problems solved by technology

[0004] At present, the flow rate of the hydraulic control system of the hoisting cylinder of the hot-pressed working machine used in China is small, resulting in a slow cylinder speed and incomplete functions, which cannot meet various extreme well conditions and operating efficiency requirements

The cost of the imported oil cylinder control system is very high, and the delivery time is very long, so it is very necessary to design a set of hydraulic control system for the hoisting cylinder of the hydraulic working machine with reasonable cost, large flow rate and complete functions, which can be applied to various complex well conditions in China of

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