Hydraulic clay gun differential control loop and control method

Abstract

The invention belongs to the technical field of blast furnace smelting, and relates to a hydraulic clay gun differential control loop and a control method. The control loop comprises a mud beating control loop and a rotation control loop which are independent of each other, an oil inlet P1 of a first reversing valve communicates with an oil supply pipeline P through an oil duct, an oil return opening T1 of the first reversing valve communicates with an oil return pipeline T through an oil duct, and an oil drainage opening Y1 of the first reversing valve communicates with an oil drainage pipeline L through an oil duct; and hydraulic oil output by a first output oil port A1 of the first reversing valve is divided into two paths which respectively communicate with a first working port and a second working port of a clay gun rotating oil cylinder. The rotary control loop cancels the control of a rotary hydraulic lock, the rotary impact is reduced, and the rotary back pressure of the clay gun can be adjusted according to the load; and a differential control loop formed by a second hydraulic control one-way valve, an overflow valve, a first hydraulic control one-way valve, a first throttling valve and a first ball valve is adopted, so that the rotating stop position of the clay gun has good stability, the rotating flow of the clay gun is increased, and the rotating speed is increased.

Description

technical field [0001] The invention belongs to the technical field of blast furnace smelting, and relates to a hydraulic circuit of a mud cannon in front of a furnace, in particular to a differential control circuit and a control method of a hydraulic mud cannon. Background technique [0002] The mud gun is a special equipment in the field of blast furnace smelting. Its function is to use hydraulic drive to drive the special gun mud into the taphole after tapping, so as to realize the plugging operation. The use of mud cannon to plug the opening is a common method of furnace operation in the field of metallurgy at present. The speed of mud cannon rotation and entry is an important parameter for the control of mud cannon. After the blast furnace taps iron, it is necessary to use a mud gun to block the taphole. The mud gun is driven by a hydraulic cylinder and has two actions: rotation and mud beating. The hydraulic control circuit controls the action and speed of the mud gun...

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Problems solved by technology

[0003] At present, the conventional hydraulic circuit in front of the blast furnace has the following disadvantages: ①The rotary back pressure of the mud gun cannot be adjusted according to the needs, and the impact generated during the movement is large; ②The hydraulic lock is used for control, and the huge inertia at the stop causes instability; ③The flow rate Relying on the hydraulic pump station cannot increase the speed of the mud gun, and the mud gun rotates slowly, which leads to a decrease in the success rate and efficiency of plugging; ④It needs to be equipped with a high-power motor and a hydraulic pump, which leads to high equipment costs and waste of energy; Burning nozzle failure increased

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