SU1214858A1 - Versions of double-circuit hydraulic drive of earth-moving machine - Google Patents

Abstract

1. A double-flow hydraulic drive of the earthmoving machine, including valve blocks, pumps with unloading hydrolines connected in a closed loop with a check valve, in the area in front of which the discharge hydroline communicates with the tank through a regulator, and a drain line connected to the valve blocks, characterized by that, in order to reduce the energy intensity of the machine, the regulator is installed in an additional drain line and is designed as a normally open hydraulically operated valve, the control hydroline Which is connected to the hydroline with an overpressure that occurs when any valve is switched on. with ® cl to 4 00 el 00

Description

2. The hydraulic actuator according to claim 1, distinguishes u and and p. The valve control hydrolini is connected to a filter with a main drain in the motor.

3. The hydraulic drive of the earthmoving machine 5 includes distributor blocks, pumps with discharge hydraulics, connected {and into a closed loop with a check valve, in the area in front of which the discharge hydraulics communicates with the tank through a re-operative organ, and communicated with Distributor blocks audible line that distinguishes ™

The invention relates to earth ™ machines, in particular to hydraulic drives of ODD1OKOVSHOVY excavators, loaders, etc., the hydraulic system which is complete with the use of several pumps.

The purpose of the invention is to reduce the energy intensity of the machine.

Fig.1 shows the hydraulic scheme of the earthmoving machine, the first option; Figure 2 is the same where the valve control hydrolines are connected to the main cream having a filter; FIG. 3 shows a hydraulic circuit of the earthmoving machine, the second option

The hydraulic actuator of the excavation mavina consists of pumps 1 and 2 connected by pressure GIIRYLINSH4Y 3 and 4 with inlets 5 and 6 of flow channels 7 to 8 hydrodistributors 9 sh 10. 6 and 3 or between zolotnknki (not shown), thus forming a closed loop. The hydraulic distribution spruce 9 and 10 are connected by drain hydrobalances 15 and 6 through a retaining device, filled with filter I, with a hydraulic tank 18 ". In addition, one of the pressure hydraulic lines, hydroline 14 is connected to inlet 5 through a check valve 19 and to the drain - through the apparatus 20 unloading. The latter can be used with a different type of control. In drawing 14858

so that the regulating orgai is made in the form of a logical valve I, whose two inputs are connected respectively to the discharge line section in front of the non-return valve and to the output of one of the control valves and the third with the tank.

4 .. The hydraulic actuator according to claim 3, is distinguished by the fact that it is equipped with a normally closed valve, established in an additional guide “- a role, telling the first two valve bits I.

2

There are examples of hydroline control 21 given. In this case, it is necessary that, although ONE directional valve, for example 9, has hydraulically operated spools

 (in the given example 22-25). In FIG. 2, the hydrolines 21 are connected to the drain hydrolines 5 in front of the retaining device, made in

filter 17,

According to the second variant of the device (Fig. E), the pressure hydroline 13 is connected to the inlet 6 of the hydraulic distributor 10 via a reversed valve 26.

Grodshshinin 13 and 14 are connected to the drain by means of an unloading apparatus in the form of a logic valve a. 27. It is possible to connect the hydrolines 13 and 14 to the mediocre

normally closed regulatory authority 28, which may have a mechanical and any other control (pedal drive in the drawing). The device works as follows.

In the neutral position of all actuating spools, (the first option, figure 1), the working fluid from the pump 1 through the flow channel 7 and

then, using a pump 2, flows through the flow channel 8, hydroline 14 and the normally open regulator 20 into the hydraulic tank 18. When one of the spools of the hydraulic distributor 10 is turned on, the working fluid is supplied to the respective actuators

engines at the same time from pumps 1 and 2.

By supplying a control signal to one of the hydraulic lines of the control 22-25 of the hydraulic distributor 9, the corresponding spool is switched, in this case the working fluid is supplied only from the pump 1. If necessary, supply the working fluid to this actuator and from the pump 2 it is necessary to give a control signal also in hydroline 2, then the draining of the working fluid from the pump 2 of the hydroline stops, under pressure of the working fluid, the check valve 19 is opened and added to the fluid from the pump I.

By switching on any of the spools of the hydraulic distributor 9, the working hydraulic fluid is supplied with working fluid from pump I and from the executive motor through the drain hydroline 5 under the pressure of the drain through the filter 17 into the hydraulic tank 18. As soon as the drain pressure begins to exceed a certain value, the normally closed hydraulic fluid 21 closes regulator 20. After that, the working fluid from the pump is supplied not to the drain, but to the executive hydraulic motor. In this case, the second pump is connected after the executive hydraulic motor starts to operate, which provides a significant reduction in dynamic loads when switched on.

15

14858

According to the second variant (Fig. 3) at the neutral position of all spools, the working fluid from pumps 1 and 2 through the outlets 11 and 12, guide

- the distributors 9 and 10 are simultaneously supplied to the logic valve I 27 and further to the hydraulic tank. By turning on: one of the spools, for example 9, the flow valve 17 is closed and

10, the supply of the operating fluid from the pump 1 through the outlet 11 to the logic valve AND 27, the purpose of which is to ensure that the working fluid is allowed to flow only at equal pressures in the supply lines, stops. Thus, in this case, valve AND 27 blocks the discharge of fluid from the inlet 12 of the hydraulic distributor.

The loss of the ability to freely drain, the working fluid supplied by pump 2, opens the return valve. pan 19 and connects with the working zhits-. bone supplied by the pump 1. The logic valve AND performs a smooth

25 connection of the flow rate of an unloaded pump, which is provided by another valve. If necessary, supply working fluid from only one pump to any executive hydraulic motor, normally close the regulator body 28 (according to the second option by pressing the pedal) in the open position, which ensures discharge of the working fluid through the logic valve And separately from the rotor 1 or 2, i.e. Each pump only works on its own hydraulic distributor.

20

thirty

Claims (4)

I. Two-stream hydraulic drive of an earthmoving machine, including distributor blocks, pumps with discharge unions connected in a closed circuit with a check valve, in the area in front of which the discharge line is connected to the tank through the regulator, and a drain line connected to the distributor blocks, characterized in that, in order to reduce the energy consumption of the machine, the regulatory body is installed in an additional drain line and is made in the form of a normally open hydraulically controlled valve, the control line of which nd is connected to hydraulic line with the arising when any distributor pressurized. SU „„ 1214858 2. The hydraulic actuator according to claim ^, characterized in that the valve control hydraulic line is connected to a main drain line having a filter. 3. A two-line hydraulic drive of an earthmoving machine, including distributor blocks, pumps with discharge hydraulic lines, connected to a closed circuit with a non-return valve, in the area in front of which the discharge hydraulic line is connected to the tank through the regulator, and a drain line connected to the valve blocks distinguishes with that the regulatory body is made in the form of a logical valve AND, the two inputs of which are respectively connected with the discharge discharge section located in front of the check valve and with the exit of one of the blocks hydrodistributors, and the third .- · with a tank. 4 .. The hydraulic actuator according to claim 3, characterized in that it is equipped with a normally closed valve installed in an additional hydraulic line that communicates the first two inputs of valve I.