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Hydraulic system, mining machine and method of controlling hydraulic actuator

A hydraulic actuator and hydraulic system technology, applied in mining machines, controlling the operation of hydraulic actuators, and controlling hydraulic actuators, can solve problems such as limiting the range of machine functions

Active Publication Date: 2022-03-25
SANDVIK MINING & CONSTR OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, known hydraulic systems offer limited possibilities to control the operation of hydraulic actuators
This in turn limits the functional scope of the machine

Method used

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  • Hydraulic system, mining machine and method of controlling hydraulic actuator
  • Hydraulic system, mining machine and method of controlling hydraulic actuator
  • Hydraulic system, mining machine and method of controlling hydraulic actuator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0050] figure 1 A mining machine 1 intended for undercutting is shown. The mining machine 1 comprises: a movable carrier 2 ; and a mining boom 3 connected to said carrier 2 by means of a turret or turntable 4 . The mining boom 3 comprises a mining unit 5 at the distal end of the boom 2 . The mining unit 5 comprises one or more rotatable C-shaped cutting heads 6 each provided with several cutting tools, which are not shown in detail. By turning the turntable 4 around the vertical axis of rotation 7, the mining boom 2 can be moved horizontally H. The mining boom 3 is also movable vertically V relative to the joint 8 . The horizontal movement H can be performed by the first boom actuator 9 , and the vertical movement can be performed by the second boom actuator 10 . The boom actuators 9 and 10 may be hydraulic cylinders powered by a hydraulic power pack PP. The mining machine 1 is capable of moving A forward and B backward. At the front end of the mining machine 1 may be a ...

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PUM

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Abstract

A hydraulic system, a mining machine and a method of controlling a hydraulic actuator. The hydraulic system (HS) is provided with a control valve (23) for controlling the direction and speed of movement of a hydraulic actuator (HA) connected to the system. The generated force of the hydraulic actuator is independently controlled with respect to the control valve by counterbalance valves (Cb1, Cb2) and servo valves (Sv1, Sv2) that control the opening pressure of the counterbalance valves (Cb1, Cb2). The counterbalance valve and the servo valve act as a metering control assembly that controls the flow of hydraulic fluid discharged from the working pressure space (16a, 16b) of the hydraulic actuator. The disclosed system may be implemented to control a mining boom (3) of a mining machine (1).

Description

Background technique [0001] The invention relates to a hydraulic system intended to operate and control hydraulic actuators connected to the system. This hydraulic system is intended for use in mining machines. [0002] The invention also relates to a mining machine and a method of controlling a hydraulic actuator. [0003] The field of the invention is defined more particularly in the preambles of the independent claims. [0004] Meter in and out control systems have been used to hydraulically control actuators of heavy machinery acting on excavation buckets, loader noses and similar robotic arms of mobile machines. The system receives pressurized hydraulic fluid from a pump and is coupled in fluid communication with a hydraulic load actuator, such as a hydraulic cylinder mechanically linked to a mechanical actuator or device. However, known hydraulic systems offer limited possibilities to control the operation of hydraulic actuators. This in turn limits the range of func...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/22F15B11/042F15B13/02F15B11/044E21B3/00
CPCF15B11/042F15B11/0445E02F9/226E21B3/00F15B2211/50581F15B2211/526F15B2211/528F15B2211/5756F15B2211/50554F15B2211/6313F15B2211/665F15B2211/7053F15B2211/3122F15B2211/3144F15B2211/327F15B2211/329F15B2211/351F15B2211/20546F15B13/0433F15B2211/30535E21D9/1026E02F9/2296F15B11/10F15B11/0413F15B2211/5059
Inventor 赖因霍尔德·波加施尼格克里斯蒂安·乌穆恩杜姆
Owner SANDVIK MINING & CONSTR OY
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