Hydraulic drive for pneumowheel dredger

FIELD: mechanical engineering, particularly hydraulically driven dredgers.

SUBSTANCE: drive comprises power plant with controlled power pumps having servo control taps, gear-box, hydraulic motors and hydraulic equipment. Hydraulic equipment has hydraulic distributor with address travel spool and its servo control taps, power hydraulic lines and servo control loop with hydraulic lines. The controlled power pumps may supply predetermined volume of working liquid at zero pressure in servo control lines thereof. Hydraulic lines for servo control of address travel spool have additional circuit including control unit, servo control lines and logical hydraulic OR valve with two inlet and one outlet taps. Hydraulic lines of servo control circuit included in additional loop are connected with inlet taps of hydraulic OR valve having outlet tap communicated with servo control taps of address travel spool.

EFFECT: provision of no-failure gear actuation in standing still dredger.

2 dwg

 

The invention relates to the field of engineering, namely excavators on the fly wheel with a hydraulic actuator stroke.

Known hydraulic actuator stroke pneumatic excavator (see Kirill Rannev AV excavators. M., High school, 1991, Excavator EO-3323, str), selected as a prototype, containing power unit with adjustable power pumps having taps, servo, valve with branches steering, power hydroline, the signal processing servo loop with the hose, transmission motors, switch gear which is carried out by the switching mechanism servo, drive shafts, front and rear axles, wheels. Transmission, representing the gear reducer has an input shaft, which is transmitted torque from the gear on the output shaft of the motor and the output shaft that transmits torque to the drive shaft and then to the front and rear axles and wheels. Torque from the primary shaft to the secondary is transmitted as follows. On the primary shaft is rigidly fixed to the first gear and second gear. On the splined secondary shaft mounted movable gear, movable along the axis of the shaft by a gearing mechanism. In the "first speed sliding gear receives torque m is the dude from gears of the first transmission. In the "second speed" mobile gear receives torque from gear second gear. When this is switched on respectively the first or second gear. In the intermediate position "neutral" mobile gear is engaged and torque of the output shaft is not transmitted from the primary.

A significant disadvantage of this drive is that when the gear is in "space" (still standing excavator) occurs frequently does not enable the transmission due to the fact that the movable gear is not in mesh with the first gear or the second gear due to the arbitrary position of their teeth relative to each other. Is opisanie gears on the ends of the teeth. The operator has several times to produce the gearshift. In many designs of actuators to eliminate this drawback, we use the so-called "suposably" that is, the rounded end profile of the teeth (see engineering. The encyclopedia. Edited Reshetova D.N., volume IV-I, M., engineering, 1995, 802). However, the defect is not eliminated, reduced, only the probability of inclusion programs. For trouble-free inclusion programs "" should, in addition to the movable gear on the splined secondary shaft to the gear mounted on the primary shaft is rotated smalol speed (hereinafter a low speed of rotation of the shaft means rotation speed of 0.5 rpm). In the known actuators to achieve a low speed of rotation of the shaft when the gear shifts hard because adjustable power pumps with the so-called "positive" control (with submission, is inversely proportional to the changing depending on the load on the Executive authority, for example, on the motor) when the supply of the control pressure in line servo immediately start to work on the maximum flow because of the gear shaft when executed transfer are not in engagement and not a burden to the motors. As a result, the motors transmit torque to the input shaft with the maximum rotational speed, resulting in not enabling the transmission. In the case of the use of regulated power pumps with the so-called "proportional" control (flow proportional changes depending on a value of control pressure) the operator is difficult to set the desired speed of rotation of the motors gearbox. This causes instability of inclusion programs. In both cases, the power rotation of the shaft when necklaceselse transfer will result in damage to the transmission or failure of the hydraulic motors.

The aim of the present invention is to provide a construction of the hydraulic actuator stroke pneumatic excavator, free from Viseu asanoha lack. This goal is achieved by the fact that in the hydraulic actuator stroke pneumatic excavator adjustable power pumps are designed to supply working fluid in a certain volume in the absence of pressure in their lines, steering, and hydroline servo address the spool stroke includes additional circuit consisting of a control unit, hose servo and logic valve OR with two input and one output taps, hydroline loop servo and hydroline steering additional circuit connected to the input taps of the valve OR output tap of which is connected to the taps of the servo address the spool stroke of the directional control valve.

The declared technical features are significant because they affect the technical result achieved.

The study of other known technical solutions in this field of technology the features distinguishing the claimed technical solution, have not been identified. This allows us to conclude that the claimed technical solution is new and not obvious from the current level of technology.

The proposed solution can be applied in industry in the manufacture of pneumatic-tired excavators.

The invention is illustrated hell is, by Mesdames, which figure 1 shows a schematic hydraulic diagram of the actuator stroke pneumatic excavator, figure 2 depicts the adjustable power pump.

The hydraulic actuator stroke pneumatic excavator contains power unit with adjustable power pump 1 with 2 taps steering, gearbox with hydraulic motors 3, the valve 4 to address the spool 5 moves, with 6 taps steering, power hydroline 7, hydroline 8 servo, blocks 9 and 10, the control mechanism 11 of the gear box and the spool 12 of the control mechanism 11 of the gear.

The hydroline 8 servo have an additional circuit consisting of a control block 13, the hose 14 servo and logic valve 15 OR.

Adjustable power pump 1 is arranged to supply fluid to a certain extent in the absence of pressure in their steering lines. This is achieved in that in the housing 16 of the pump has an adjusting screw 17, limiting the minimum angle of rotation of the distributor 18 sloping block 19 of the cylinder that provides a fixed amount of the minimum flow of the pump in the absence of pressure in his line of servo control.

The operation of the actuator stroke.

When the gear is in "" the statement includes a valve 12 controlling the Oia, the control unit 9 and unit 13 of the control circuit of the servo, while the working fluid through the hydroline 14 servo and valve 15 OR supplied to the outlets 6 of the servo address the spool 5 stroke and moves it in the right direction (move forward or move backward), while the power hydroline hydraulic motors 3 gearbox are connected with the pressure hose adjustable power pump 1, which, due to the lack of pressure in their lines steering, produce the minimum flow of the working fluid, thereby providing a minimum speed motors, besides the working fluid through the valve control 12 is supplied to the switching mechanism 11 gear boxes and seeks to enter the sliding gear of the output shaft in mesh with the gear transmission. As well as the drive shaft rotates at a low speed, is guaranteed to enable transfer.

The excavator starts slow motion, which is a sign including transmission, then the operator turns off the control block 13 and includes a block 10 of the control, while the working fluid through the hydroline 8 servo, valve 15 OR affects address the spool 5 moves, as well as through the bends 2 servo regulator power pump 1, and the feed pump increases, and excava the EOS smoothly increases movement speed to the maximum.

The hydraulic actuator stroke pneumatic excavator containing power unit with adjustable power pumps having bends steering, gear box, hydraulic motors, hydraulic equipment, including hydraulic control address spool stroke and its branches steering, power hydroline, the signal processing servo loop with the hose, wherein the adjustable power pumps are designed to supply working fluid in a certain volume in the absence of pressure in their lines, steering, and hydroline servo address the spool stroke includes additional circuit consisting of a control unit, hose servo and logic valve OR with two input and one output taps, with the hydroline loop servo and hydroline steering additional circuit connected to the input taps of the valve OR output tap of which is connected to the taps of the servo address the spool stroke of the directional control valve.



 

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