SU610950A1 - Excavator hydraulic drive servocontrol system - Google Patents

Description

management; in fig. 2 - control part of the servo control system. The hydraulic actuator of the excavator contains two power pumps 1 and 2 supplying the working fluid from the hydraulic tank 3 to the razot-regulating unit 4, the three-hammer power distributor 5 of the hydraulic motors and, through check valves 6 and 7, to the power distributor 8 of the hydraulic equipment of the working equipment. The unloading control unit 4 and the power distributors 5 and 8 together constitute the throttles of the hydraulic actuator control device. Safety devices, filters, heat exchangers and drainage to simplify the circuit are not shown. Two actuating lines 9 and 1 are connected to the unloading and regulating unit 4, which contains two control valves for current and unloading power, from the servo control 1 and 1. Hydraulic motors 11 (left track of excavator movement), 12 (right track of excavator movement) and 13 (turn of platforms To work valve of power distributor 8, installed for two hydraulic engines and fixed to hydraulic pumps are connected to different pumps: 14 trills, 15 buckets, and 16 sleeves. The control lines of the servo control system (Fig. 2) contain control lines of all the spools of the power distributors 5 and 8. in itself pressure hydraulic line 17, servo-control units of power distributors: 18 - hydraulic boom boom and forging boom, 19 - hydraulic motor for platform and handle rotation, 2O - hydraulic motor for excavator movement. Executive hydraulic lines 21 and 22 for spool 23 and 24 pressure control connected by means of a four-way reversing spool 25 s and an additional hydraulics 9 and 1 o control knobs of the unloading-regulating unit 4 regulating flows and unloading power (gas pumps. Hydrolinks 26 and 27 at the board are connected to the control cavities of the four-head three-piece gold 25 and to the valve cavities® OR 28, connecting with the hydraulic lines 29 and 30, {ShlzhoagIMis by tapping streams from each block is servo-controlled. Hydrolines 31–48 Bredmaen for the control of hydraulic engines: And, connected to the main drain line, connected to the main pit 3 ;; and giz.ro lines 29 and 30 are connected to pressure hydroline 17. The servo control blszhi 18 and 19 contain four-seven-way discrete action spools, which are connected to pressure control spools by means of hydrolines 29.30 and 17. The servo control unit 2O of the power distributors of the excavator hydraulic motors with control lines 13,32,35 and 36 is executed according to the traditional scheme and has no distinctive features. The servo system works as follows. When the discrete action spools are neutral, the servo control blocks 18 and 19 and the pressure control spools 23 and 24 pressure from the pressure hydraulic line 17 is supplied to the pressure control spools 23 and 24 and to the control cavity of the four-way reversing three-position spool 25 by means of the hydraulic lines 26 and 27, and also 29-30 through slapans 28 OR. Hydraulic control 33.34 37 ... 48 spools disk. The combat action and actuating lines of the spools 22 and 23 of the control are connected to the hydraulic line connected to the hydraulic tank 3. To activate the hydraulic motors of the knob-turn vi vi turn the platform by moving the handle on the block 19: servo-control turn the knob of the knob-turn hydraulic lines 45 and 47 are brought and the turn control spool of the platform to which the hydrolines 34 are led. Simultaneously, the pressure control spool 24 is connected simultaneously connected to the discrete spools The action of this block. Hydrolines 34 and 35 are then connected to pressure hydroline 17, and hydrolines 47 are connected to drain hydroline. As a result, the motor-controlled valve 34 of the platform turning motor 13 is turned on, located in the hydraulic valve 5 and powered from the pump 2, and also includes the hydraulic cylinder stick 45 controlled by the hydraulic pump 16 from the hydraulic cylinder 16 fed from the power pump 2 is not included, because the control hydrolines 47 are connected to the drain. At the same time, the signal from the pressure control slide valve 24 is supplied by the hydroline 22 to the four-way reversing slide valve 25, which By moving the sig paw from the link line 27, it moves to a position (in fig. 2. down), the hydroline 26 of the second strip of the 2S spool will be connected to the drain hydroline. In this case, depending on the control force on the spool 24, the magnitude of the control signal in hydraulic lines 9 and 10 and the degree of unloading of the power pumps 1 and 2, whose flows are partially or FIELD directional to the power distributors 5 and 8, change. nutrition

crank hydraulic motors and turning from different streams. Similarly, when splitting the flows, a reliable combination of the main working movements of the excavator takes place: the platform and bucket rotate, the frame and boom turn, the arm and the bucket, the boom arm, the bucket and the boom.

To unify the flows when any one hydraulic cylinder of the working equipment is turned on by any cavity, it is sufficient with noMomiv hands O7; aa block 18 of the servo control or on block 19 of the servo control, pass through the corresponding discrete action spool and the pressure control spool associated with it.

In this case, L4 simultaneously ™ but both spools of the power dispenser 8 supplying this hydrocylinic from the safety switch 1 and 2 are turned on, and valve-unloading-regulating unit 4 is also triggered and the flow is automatically summed. For example, when moving the disk spool, controlling the hydraulic lines 45 and 47 of the control, which was removed from this third slide of the pressure control spool 24, the applied pressure in the control space of the hydraulic lines 45 and 47 will move the control valve spool 8, and from the control valve 24 the pressure will be supplied by the hydroline 22 and the four-way reversing spool 25, which, under the action of the signal og of the hydroline 27 peremc1-its, to the extreme position, the hydroline 26. the second cavity of the spool 25 will be connected to the hydra the line of plum. Thanks to the signal from the hydraulic unit 22, it will be fed to the unloading-regulating unit 4, which will direct the flow of pumps 1 and 2 to the power distributor 8 through check valves 6 and 7, the piston cavity of the hydraulic cylinder 16 will be fed by the total flow from pumps 1 and 2 .

In case of simultaneous switching on of three or four discrete action spools, only two main movements will occur, as the control pressure can flow into the control hydrolines from only two lines that pass successively in the opposite direction through all the discrete action spools.

The presence of servo-control units, equipped with discrete action spools connected to pressure control systems, provides for increased reliability of the servo-fastening system when combining a number of basic work movements, which reduces the duration of the excavation cycle and increases its performance. The e4) efficiency of the hydraulic drive is also increased by providing an automatic dry flow during operation with one hydro-cylinder of working equipment.

Formula 3 and 3. Ii and

CHCTe vfa servo-controlled hydraulic drive ON of an excavator, containing servo-control units for power distributors, hydraulic controllable choke-regulating device, including pressure hydraulic line, control axles for pressure control, power distributors with executive lines, and as a matter of your own design plan, you will have a good target for your task. Systems, control blocks are equipped with spool of action, connected with pressure control spool.

Sources, informations. taken into account in the examination ;;

1. Excavator ZO-4321 Kiev Ex-cavator plant, 1969.

2. Cuntssr 3. REXROTH, MpBaLHUDl AUL5K WOWE PERSONNEL OG ROTGMATZON “Informational issue of the ICj 1970, p. 17, fig. ten,

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