Hydraulic system of mining anchor cable tensioning machine

Abstract

The invention relates to a hydraulic system of a mining anchor cable tensioning machine. The hydraulic system comprises a main reversing valve, a speed regulating valve, a one-way valve, a hydraulic control reversing valve, a hydraulic control one-way valve, a pressurizing cylinder, a tensioning oil cylinder and a safety valve; the speed regulating valve and the pressurizing cylinder are additionally arranged between the main reversing valve and the anchor cable tensioning machine, the speed regulating valve can adjust the flow according to the actual working condition, the pressurizing cylinder is used for increasing the pressure, when the required pressure of the tensioning oil cylinder is low, alloil liquid flows directly to the tensioning oil cylinder through the hydraulic control one-way valve, so that the oil liquid can be quickly operated in the expected direction; when the load on the tensioning oil cylinder is increased, the needed pressure is increased, and apressurizing piston of the pressurizing cylinder starts to do reciprocating motion until the pressure requirement of the tensioning machine is met; and when the pressure is overloaded, the pressure can be unloaded through a safety valve. According to the hydraulic system of the anchor cable tensioning machine, pressurization, speed regulation and safety protection are comprehensively considered, the requirement for continuous automatic pressurization is met, and the problems that the tension of the tensioning oil cylinder of the anchor cable tensioning machine is insufficient, and the speed is not easy to control are solved.

Description

technical field [0001] The invention relates to a mine auxiliary device, in particular to a hydraulic system of a mine anchor cable tensioner. Background technique [0002] In the operation of fully mechanized excavation face in coal mines, the use of fully mechanized excavators can greatly improve work efficiency and reduce the labor intensity of workers. However, when the roof is fully anchored and supported, the manual anchor cable tensioner is generally used. The labor intensity of workers is high and the speed is extremely slow, which can no longer meet the requirements of safe and efficient production in coal mines. If the tensioner directly uses the hydraulic system of the fully mechanized excavator, the hydraulic system pressure of the fully mechanized excavator generally does not exceed 20MPa, while the anchor cable tensioner needs a pressure of 25-30MPa, which obviously does not meet the design requirements of the anchor cable tensioner. [0003] In addition, the ...

AI Technical Summary

Problems solved by technology

However, when performing full anchor cable support on the roof, manual anchor cable tensioning machines are generally used. The labor intensity of the workers is high and the speed is extremely slow, which cannot meet the requirements of safe and efficient production in coal mines.

If the tensioning machine directly uses the hydraulic system of the fully-mechanized excavator, the hydraulic system pressure of the fully-mechanized excavator generally does not exceed 20MPa, while the anchor cable tensioner requires a pressure of 25-30MPa, which obviously does not meet the design requirements of the anchor cable tensioner

[0003] In addition, the emulsion of the hydraulic system of the fully mechanized excavator is directly introduced, and the reversing valve is used to directly supply oil to the anchor cable tensioning equipment. The movement speed of the tensioning cylinder is extremely slow, which is not suitable for workers to control, and even poses safety hazards.

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