Hydraulic drive of single-bucket excavator

FIELD: construction engineering and mining machinery.

SUBSTANCE: invention relates to drives of cyclic action machines. Propose hydraulic drive includes power motor, flywheel, pumping set, hydraulic motor regulated to "p=Const", hydraulic motors of actuating mechanisms valves "OR" installed between pressure and drain main lines of hydraulic motors of actuating mechanisms, distributing equipment and tank. Pumping set is made two-section. Shaft of one section of pumping set is mechanically coupled with shaft of power motor, and shaft of other section is mechanically coupled with shaft of hydraulic motor and flywheel, and flywheel is coupled with shaft of motor by overrunning clutch.

EFFECT: improved reliability and economy of drive owing to provision of constant loading of motor.

1 dwg

 

The invention relates to the construction and mining technique, namely, to drive vehicles cyclic actions.

Known hydraulic shovel excavator, comprising a pump driven in rotation power motor with flywheel, hydraulic actuators, hydraulic motor, installed in the drain line, switchgear and tank (as the USSR №621842, E02F 9/22). The disadvantages of the known solutions should include inability useful life of energy stored actuators of the excavator.

The closest solution known is the hydraulic shovel excavator, comprising a pump unit and adjustable according to the law p=Const" hydraulic motor driven in rotation power of the engine, flywheel, hydraulic actuators, switchgear valve "or" and the tank (as the USSR №1751279, E02F 9/22). This solution allows you to return the drive energy during braking of the working bodies of the excavator.

The disadvantage of the hydraulic drive is that when performing operations, when the braking energy is returned to the drive and is converted by the motor into the energy of rotational motion, increases the speed of rotation of the flywheel and connected to a shaft power of the engine as a consequence, the engine comes out of the Opti is the real working area. The change in the speed of operation of the engine reduces its reliability and efficiency of the drive.

The objective of the invention is to improve the reliability and efficiency of the actuator by providing a constant load mode of the engine.

The problem is solved in that the hydraulic drive comprising a power engine, flywheel, pump unit, regulated by law, "p" hydraulic motor, hydraulic actuators, which are installed between the pressure and return lines of the hydraulic actuators valves or, switchgear and tank, equipped with overrunning clutch, with its pump unit is made in two sections. The shaft of one of the sections of the pumping unit kinematically connected with the shaft power of the engine, the shaft of another partition kinematically connected with the shaft of the motor and the flywheel, and the flywheel is connected with the shaft power of the engine through an overrunning clutch.

The result is returned in the drive energy is transferred to the hydraulic motor to the energy of the rotational motion and increases the speed of rotation of the flywheel and connected to a shaft section of the pump unit, and not the engine.

This solution is illustrated by a drawing, which shows a hydraulic diagram shovel excavator.

The hydraulic actuator includes sections 1 and 2 of the pumping unit governed by the output according to the law p=Const" hydraulic motor 3, the power of the engine 4, the flywheel 5, the hydraulic motors 6 actuators, switchgear 7 valves 8 "or"tank 9, the check valves 10 and overrunning clutch 11.

The hydraulic actuator operates as follows.

After the launch power of the engine 4, while the rotational speed of the flywheel 5 is equal to the frequency of rotation of the motor shaft, the last downloaded 1 and 2 section of the pump Assembly.

When performing non-energy-intensive operation of the energy from section 1 of the pumping unit is supplied to the motor 3, which is converted into the energy of rotational motion and transmitted to the flywheel 5, where it accumulates by increasing the speed of rotation of the latter relative to the speed of rotation of the shaft power of the engine 4 (the overrunning clutch 11 installed between the flywheel 5 and the shaft power of the engine 4, provides rapid rotation of the flywheel relative to the shaft power of the engine 4).

When braking actuators working fluid through the valves or 8 enters the hydraulic motor 3, where the energy flow of the working fluid is converted into the energy of rotational motion. The shaft section 2 of the pumping unit, hydraulic motor 3 and the flywheel 5 by increasing the speed of rotation ahead of the speed of rotation of the shaft power of the engine 4 and accumulating kinetic energy.

Under certain power-intensive operation energy to the actuator which comes from sections 1 and 2 of the pumping unit, when the engine is loaded only section 1 of the pumping unit, adjusted by the selection constant power, and section 2 selects the energy from the flywheel 5, the speed of which decreases until, until compared with the speed of rotation of the shaft power of the engine 4. Thus the kinetic energy of the flywheel 5 is transformed by section 2 of the pumping unit in the energy flow and is transmitted to the hydraulic motors 6 actuators. Moreover, the change in angular velocity of the flywheel 5 has no effect on the operation mode of the power of the engine 4.

The advantage of the proposed hydraulic actuator in comparison with the known is to increase its reliability and efficiency (10%) at the expense of ensuring continuous mode of operation.

The hydraulic shovel excavator, including power engine, flywheel, pump unit, regulated by law, "p" hydraulic motor, hydraulic actuators, which are installed between the pressure and return lines of the hydraulic actuators valves or, switchgear and the tank, wherein the pump unit is made of two sections, the shaft of one of the sections of the pumping unit kinematically connected with the shaft power of the engine, the shaft of another partition kinematically connected with the shaft of the motor and flywheel, and mA is the speaker connected with the shaft power of the engine through an overrunning clutch.



 

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1 dwg

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3 dwg

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9 dwg

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5 cl, 6 dwg

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EFFECT: increased simplicity and efficiency of hydraulic drive heating at negative ambient temperatures.

1 dwg

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