SU1357510A1 - Hydraulic drive of working member of earth-moving machine with closed-path circulation of working fluid - Google Patents

Abstract

The invention relates to hydraulic drives of the working equipment of earthmoving machines, namely to hydraulic drives of chain trench excavators, made according to the scheme with a closed flow. The purpose of the invention is to increase the reliability of work. The hydraulic drive contains a main pump 1 connected by a pressure hydraulic line (HL) 2 with a reverse hydraulic motor (HM) 3. The second hub of HM 3 is connected to HL 4 with a pre-7j1. & / (L with / B N 10 tra 7 I L.JJ TT-J / - g "DO SD 1 cl 75

Description

A relief valve 5 with a discharge control flow (PUR), the main flow of which is connected to CH 6 with the suction port of the pump 1. The feed pump 7 is connected to CH 8 with the second supply GM 3. Between CH 2 and 6 there is a safety valve 9 with PSUR. The Ktsapan 10 pressure is connected to CH 6 with the tank 11. The controlling. Organ 12, made in the form of a four-way distributor, is connected

. one

The invention relates to hydraulic drives of the working equipment of earthmoving machines, namely to hydraulic drives of chain trench excavators, made according to the scheme with a closed flow.

The purpose of the invention is to increase the reliability of the hydraulic drive.

The drawing shows a hydraulic diagram of the hydraulic drive of the working equipment of the earthmoving machine.

The hydraulic drive of the working equipment of the earthmoving machine comprises a main pump 1 connected by a pressure head hydraulic line 2 to a reversible hydraulic motor 3 of the drive of the working equipment. The second supply of the hydraulic motor 3 is connected by hydroline 4 to a safety valve 5 with a supply flow control discharge, the drain of the main flow of which is connected by hydroline 6 to the suction port of the pump 1. The boost pump 7 is connected by hydroline 8 to the hydroline and the second supply of the hydraulic motor 3. Between the pressure hydraulic line 2 and the low pressure hydraulic line 6, a safety valve 9 is installed with an unloading control flow supply. The pressure valve 10 is connected by hydroline 6 to the tank 11.

The control unit 12, made in the form of a four-way three-way distributor, is connected by hydrolines 13 and 14 to the flow of unloading control of safety valves 5 and 9, as well as by hydroline 1-5 to the tank 11. The fourth outlet of the distributor is muffled.

Chapters 13 and 14 with PPUR valves 5 and 9 and Chapters 15 with tank 11. The fourth tap of the distributor is plugged. Pump 1 through CH 2 feeds the working fluid to ha 3, drives it into rotation, and then into CH 4. If the valve 5 with the PSUR is open, the fluid enters CH 6 and into the suction inlet of the pump 1. A closed circulation circuit is formed . The replacement of volume losses is provided by the pump 7. 1 sludge.

five

This hydraulic scheme of the earthmoving machine provides, at the neutral position O of the controlling body, 12 stopping the working equipment; at the position a of the distributor 12 - rotation of the working equipment forward at a speed corresponding to the supply of the main pump 1; in position b, the working equipment is reversed at a reduced speed, corresponding to the supply of the make-up pump 7, Pump 1 through hydroline 2 supplies the working fluid to the hydraulic motor 3, drives it into rotation and then to hydraulic line 4. In case the safety valve 5 with flow control the discharge is open, the liquid flows almost unimpededly into the hydraulic and rollin 6 and into the suction nozzle

 pump 1. Forms a closed circuit. The replacement of volume losses is provided by a booster pump 7 supplying the fluid through the hydroline 8 to the hydroline 4 and then to the suction nozzle.

Drainage of excess make-up to tank 11 is provided through pressure valve 10. System overload protection

0 is provided with a safety valve 9. If there is a possibility of a mechanical shutdown of the main pump 1 with the sub-Beater pump 7 turned on, it is enough to shut off the flow

5 controlling the unloading of the valve 5, the valve will close and the flow of working fluid from the feed pump 7 will cause the hydraulic motor 3 to rotate in the opposite direction. This will begin to rotate3 1357510.4

c and pump 1 in the opposite direction, and works as a safety device — the liquid from the hydraulic line 6 will be equipped when the worker is rotated and equipped with valve 10 into the tank, i.e. in the opposite direction. The pump 7 is turned into an open circuit. In the case of a working fluid to the hydraulic flow, if the main pump 1 and the make-up 3, driving it into rotation in the common pump 7 is turned on and off from the military direction. The drain from the hydraulic valve at the same time or not at all disconnecting the torus through the hydroline 2, the valve open, the working circuit 9 temporarily stops, the hydroline 6 enters the assembly when the IQ engine is running, the discharge nozzle of the pump 1. can be provided simultaneously. through pressure relief safety valve 10 pressure in tank 11, i.e. in this new 5 and 9. For the purpose of blocking the system-case, as in the previous ones, we ensure control from the erroneous switching on of the system with closed valves, serves as a control unit 12, as it circulates in hydroline 6 the neutral position enters (minus leaks) the supply of the hydraulic line for supplying control flow to pumps 1 and 7, and is consumed only by unloading the safety valve-supply pump 1.

Claims (1)

New 5 and 9 with a tank. In position a of the governing body 122o valve 5 is unloaded and provides the hydraulic actuator of the working body of the earth circulation of the working fluid in the hydro - machine with a closed flow Low pressure lines and make-up of circulation of the working fluid are included. The valve 9 is closed at the same time and the main and makeup pumps, It works as a safety device with a turn-25 reversible hydraulic motor, preserving the working equipment, forward valves, which have outlets In position O of the governing body, valves 5 and 9 are unloaded with the suction line of the main body 12. With this pump and installed in pressure the flow of pump 1 is looped in hydrolines corresponding to the direct line 2 through the open valve 9zo reverse rotation of the working body, and hydroline 6. Flow from pump 7 governing body, made in vihidrolinii 8, open valve 5, de four-way three-way guide The roller line 6 and the valve 10 of the pressure of the distributor station, differing in tank 11. The hydraulic motor 3 is, in order, in order to reduce it loaded on both sides with approximately equal reliability, feeding the pump with a connecting pressure corresponding to it with one of the hydraulic motor leads, the construction of a pressure and resistance valve; a three-position valve. In the discharge in the unloaded valves 5 and 9. The midpoint of its position connects the flow to the position b of the controlling body 12 of the control of the discharge, the safety valve 9 is unloaded. Valve 5 closing valves with drain.