SU1752887A1 - Power saving hydraulic control system of excavator - Google Patents

Abstract

SUMMARY OF THE INVENTION device 1 comprises a pressure reservoir torny power unit 1, 2 a hydraulic pump, hydraulic reservoir 4 torny pressure reservoir control valve 6, hydraulic cylinder 7, the control cylinder 11, on-off electrohydraulic roraspredelitel 12, dial 13 time, the timer 14, a comparator 15, a bandpass frequency filter 16, pressure sensor 17 3-2 - 1-4, 16-15-14- 11.bil

Description

The invention relates to an excavator construction, namely to the energy-efficient hydraulic systems of an excavator control.

The energy-saving hydraulic control system of the excavator is known, which contains a hydraulic accumulator power supply unit to the input of which a hydraulic pump is connected, the first output is connected to the hydraulic tank, the second output of the hydraulic accumulator power supply unit is connected to the actuator hydraulic cylinder through a hydraulic control valve.

The disadvantage of this excavator control system is low fuel efficiency, due to the lack of an automatic engine speed reduction device when the control units are in neutral position:

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The closest in technical essence to the proposed is an energy-saving hydraulic system pack (L

the excavator, containing a hydroaccumulator power supply unit, to the input of which a hydraulic pump is connected, the first output is connected to the hydraulic tank, the second output of the hydroaccumulator power supply unit is connected to the hydraulic actuator of the executive body, the third output of the hydroaccumulator flea control is connected to the first and second hydraulic actuator cylinders; servo controls that connect the control inputs of a hydraulically controlled hydraulic distributor with a hydraulic tank and a control hydraulic cylinder.

A disadvantage of the known energy-saving hydraulic control system of an excavator is the lack of efficiency of its operation due to the low speed due to the large number of hydrovalves Ili and the significant length of connecting hydraulic lines.

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The purpose of the invention is to increase the efficiency of the excavator hydraulic system by saving fuel.

The energy-saving hydraulic control system of the excavator, containing a hydraulic accumulator power supply unit, to the input of which a hydraulic pump is connected, the first output is connected to the hydraulic tank, the second output of the hydraulic accumulator power supply unit is connected to the hydraulic actuator of the actuator, the third output of the hydraulic accumulator block, the control unit, and the control unit. the second servo control spools connecting the control inputs of a hydraulically controlled hydraulic distributor with hydraulic tank and hydraulic cylinder control unit is equipped with a two-position electro-distributor, a time setting device, a timer, a comparator, a band-pass frequency filter and a pressure sensor, whose input is connected to the third output of the hydroaccumulator power supply unit, and the output is connected through serially connected band-pass frequency filter and comparator and connected to the first timer input, to the second input of which is connected to the time master, and the timer output is connected to the control input of the two-position electrohydraulic distributor connecting the hydrocylin Other controls with the fourth input of the hydroaccumulator power supply unit.

When using the proposed energy-saving hydraulic control system of an excavator, in comparison with the known, the efficiency of the excavator and fuel efficiency are improved.

FIG. 1 is a schematic diagram of an energy-saving excavator control hydraulic system; in fig. 2 is a graphical dependence of P f (t), where P is the pressure in the control hydraulic system; in fig. 3 is a graphical dependence 1) f f (t), where UV is the voltage at the output of the band-pass frequency filter; in fig. A is the graphical dependence of UK f (t), where UK is the voltage at the comparator output; in fig. 5 is a graphical dependence of UT f (t), where UT is the voltage at the output of the timer.

The proposed energy-saving hydraulic control system of an excavator containing a hydraulic accumulator power supply unit 1, at the input of which a hydraulic pump 2 is connected, the first output 3 is connected to a hydraulic machine 4, the second output 5 of the hydraulic accumulator power supply unit 1 through a hydraulically controlled hydraulic distributor 6 is connected to the hydraulic cylinder 7 of the executive body, third exit 8

hydroaccumulator control unit 1 is connected to the inputs of the first 9 and second 10 servo-control spools, which connect the control inputs of the hydraulic control valve 6 with the hydraulic tank 4 and the hydraulic cylinder. 11 controls, equipped with a two-way electro-distributor 12, a time setting device 13, a timer 14, a comparator 15, a bandpass

a frequency filter 16 and a pressure sensor 17, the input of which is connected to the third output of the hydroaccumulator power supply unit 1, and the output via serially connected band-pass frequency filter 16 and

comparator 15 and connected to the first input of timer 14, to the second input of which time adjuster 13 is connected, and output 18 of timer 14 is connected to control input of two-position electrohydraulic distributor 12 connecting control hydraulic cylinder 11 to fourth fourth input of hydraulic accumulator power supply unit 1.

Energy-saving hydraulic control system operates as follows.

When the engine is idling, the pump 2 creates in the pressure hydroline of the hydroaccumulator unit 1 a stable pressure with a minimum amplitude of pulsation (in Fig. 2,

time interval from 0 to ti). In this case, at the output of the band-pass frequency filter 16 {the continuous line in FIG. 3), comparator 14 (UK. Fig. 4) and timer 14 (From, Fig. 5) there is no output signal,

When you turn on any block 9 or 10 of the control (Fig. 2, time ti), the working fluid goes to the control valve 6 through the hydroline to the control valve 6, moving it to the operating position, and

0, the working fluid from the pump 2 is supplied to the actuator.

At the moment of switching on of blocks 9 and 10 of the control in a pressure line, there is an abrupt pressure drop

5 of the working fluid (Fig. 2, starting at time ti), which is converted by the pressure sensor into an electrical signal, and after its passage through the band-pass frequency filter 16 is converted into a signal whose magnitude is proportional to the magnitude and rate of differential pressure in the pressure line (Fig. 3, solid line),

The magnitude of the signal at the input of the comparator 15 for a short period of time exceeds the magnitude of the reference voltage U0n f (А Р; Р) fed to the input of the comparator 15 and selected in such a way as to ensure reliable operation

the comparator 15 from the pressure dips in the control line when the control units 9 and 10 are turned on, and its operation was excluded when the pressure in the control line was changed. Therefore, at time t2, the output of the comparator 15 produces a short signal (FIG. 4), which is fed to the input of timer 14 and starts it (FIG. 5) for the time specified by the setting unit 13. The signal from the output 18 of the timer 14 is fed to the control valve electromagnets 12 , the transfer of the latter to the position in which the pressure head hydraulic line is connected to the control hydraulic cylinder 11 of an energy-saving device, which, acting on the rail of the fuel pump, brings the engine to maximum speed during the time t4 - ta. The pressure in the pressure line during this time increases to P (Fig. 2), but the triggering of the comparator 15 does not occur (Fig. 3). Turning on the control units 9 and 10 at the times ts and te leads to the formation of short pulses at the output of the comparator 15 (FIG. 4) and to restart the timer 14 each time by the time set by the setting device 13.

After the control units 9 and 10 are turned on at the time te, the timer 14 runs the time set by the setting device 13 and equal to the interval te - 7, and turns off the solenoid valve 12, switching it to a position in which the control hydraulic cylinder 11 of the energy-saving device is connected to the hydraulic tank 4 and I will act on the rail of the fuel pump, puts the engine on idle (tg - te).

With subsequent switching on of blocks 9 and 10 of the control, the cycle of operation of the energy-saving system is similar.

The proposed energy-saving hydraulic system will increase the efficiency of the excavator.

Claims (1)

An energy-saving hydraulic control system of an excavator, comprising a hydraulic accumulator power supply unit, to the input of which a hydraulic pump is connected, the first output is connected to the hydraulic pump, the second output of the hydraulic accumulator power supply unit 5 is connected to the hydraulic cylinder of the power supply unit through a hydraulic control valve 5, connected to the hydraulic cylinder of the body, the third section, the current figure, the first figure, the current figure, one time and one distance and one distance and one of distance of distance of 100%, three three, three of them, one of 16 squares, one time, one time and one distance and one distance and one distance and one distance and one distance of parameters and four parts of the body, one Hydrocontrol Hydraulic Distributor 5, one of them, will be connected to the hydraulic cylinder of the power supply through the hydraulic control valve 5 that is connected to the hydraulic cylinder of the control unit and connected to the hydraulic cylinder of the power supply unit through a hydraulic control valve 5, connected to the hydraulic cylinder of the control organ, the third section, the current figure, one time and one distance, one time and one distance and one distance and one distance and one distance and time has been passed to the control valve of the body that is connected to the hydraulic accumulator power supply unit. the control unit is connected to the inputs of the first and second servo control valves connecting the control 0 inputs of a hydraulically controlled hydraulic distributor with a hydraulic tank, and a hydraulic control cylinder, characterized in that, in order to increase the efficiency of the hydraulic system of the excavator by saving 5 fuel, it is equipped with a two-way electro-distributor, a time unit, a timer, a comparator, a band-pass frequency filter and a pressure sensor, the input of which is connected to the third 0 to the output of a hydroaccumulator power supply unit, and the output is connected via a series-connected band-pass frequency filter and comparator to the first input of the timer, to the second input of which is connected 5 is set to time, and the timer output is connected to the control input of the two-position electrohydraulic distributor connecting the control hydraulic cylinder to the fourth input of the hydroaccumulator 0 power supply, Khreihe tol- // libnaeo Macs- / sadbigr / sang, f0 J4 , f0 / FIG. 2 , Јцtr .tl