SU1427066A1 - Hydraulic haulage gear of cutter-loader - Google Patents

Abstract

The invention relates to mining engineering. The purpose of the invention is to increase the reliability and durability of work. The hydraulic feed mechanism of the shearer includes a power circuit a, a feed circuit (G and control circuit B. Power circuit d includes a reversing pump (H) 1, hydraulic motor 2, safety valve m / fO pan (k) 3 and reverse K 4, 5 The charge circuit includes H 6 feeds, K 7 pressure and return K 5. The control loop includes -H 8 controls, K 9 pressure, spool 10 and 11 capacity control H 1. In this case, H 8 suction line g- is included in the pressure line H 6 make-up. At start-up H 1 is in the position of the zero producer H 6 feeds through K 5 fills the hydraulic system with working fluid (RJ). After that, the pressure in the make-up circuit rises to the setting value K 7 and simultaneously enters the suction line H 8. Then the RJ is pumped into the control circuit, the pressure in which supports K 9. Surplus RJ through K 9 enters the pressure feed line H 6. From the reverse H 1, the RJ enters the hydraulic motor 2 and causes it to rotate in a given direction and at a given speed. 1 il. (G with K: h with a about:

Description

FIELD OF THE INVENTION The invention relates to mining engineering and is intended for feed mechanisms of shearers.

The aim of the invention is to increase the reliability and durability of work.

The drawing shows the hydraulic circuit of the feed mechanism.

The hydraulic scheme of the feed shearer feed mechanism represents a three-loop system including a power circuit and a I feed circuit b and a control loop 6

The power circuit includes a variable capacity reversing pump 1, a hydraulic motor 2, and a safety system in the form of a safety valve 3 and check valves 4 and 5.

The feed circuit includes a feed pump 6, a pressure valve 7 and check valves 5, through which the connection is made to the force circuit as well as lines 2 and a, providing communication to the control loop 6. Line 2 is the suction line of the control pump 8, the line It reports the pressure lines of the pump 8 control and the pump 6 feed.

The control circuit includes a control pump 8, a pressure valve 9, a spool 10, and a capacity control device 11 of the variable capacity reversible pump 1.

The device works as follows.

Pumps 1, 6 and 8 are turned on.

At start-up, the pump 1 is in the zero-capacity position, the pump 6 is fed through the check valves 5 and the hydraulic system is filled with the working fluid.

After filling, the pressure in the make-up circuit 5 rises to the setting value of the pressure valve 7 and simultaneously enters the suction line. pump 8 control. From the excess of the working fluid pumped by the feed pump 6, they are drained through the valve 7 into the feeder bath.

A working fluid that enters the suction line of the control pump 8 is injected into the control loop b, the pressure in which is maintained by the pressure valve 9.

Excess fluid pumped by the 8-control pump, through the pressure valve 9, flows through the line

Q Q to the pressure line of the feed pump 6 (circuit (5) and is used for feeding purposes.

When you turn on the spool 10, controlled by the operator or machine,

5, the working fluid from the pump 8 of the control is supplied to the device 11 for controlling the capacity of the reversing pump 1.

From the reversing pump 1, the working fluid enters the hydraulic motor 2 and causes it to rotate in a given direction and at a given speed.

0

In the event of problems in the hydraulic system of the power a or feed circuit (leakage, pipeline gusting, failure of pressure valves, failure of the pump 6 feed), the pressure in the feed circuit cf, and therefore, at the outlet of the pump 8. control loop is terminated.

Feed rate control becomes impossible until the cause of the fault has been eliminated.

Claims (1)

Invention Formula The hydraulic feeder of the shearer, including hydraulic motor, variable reversible pump, make-up pump and its pressure line, suction and pressure lines and control pump, characterized in that increase reliability and durability of operation, the suction line control pump is included in the feed line of the feed pump, and the pressure line of the control pump and feed pump are reported between themselves by means of a pressure valve.