Lifting system and lifting method for jib of an operating machine, and an operating machine thereof

  • US 9,638,217 B2
  • Filed: 12/26/2011
  • Issued: 05/02/2017
  • Est. Priority Date: 03/21/2011
  • Status: Active Grant
First Claim
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1. A lifting system for a jib of an operating machine, comprising:

  • an energy storage device used for storing the gravitational potential energy during the descending of the jib and lifting the jib by use of the stored energy during the ascending of the jib, the energy storage device includes an energy storage cylinder and an accumulator, the energy storage cylinder comprising an upper chamber and a lower chamber which are separated by an energy storage piston, wherein the energy storage piston comprises an energy storage piston rod operably connected to the jib, wherein an upper volume of the accumulator is filled with a pressurized gas, and a lower volume of the accumulator is filled with a pressurized hydraulic oil, where in an operating mode of the operating machine, in which the lifting system is operated for ascending and descending the jib, the lower chamber of the energy storage cylinder and the lower volume of the accumulator are always kept in direct fluid communication via a first pipeline, to provide a closed system to automatically store energy in the accumulator when the jib descends and to release energy to the energy control cylinder when the jib ascends under control; and

    in a shutdown mode of the operating machine, in which operation of the jib to ascend and descend is stopped, a valve in the first pipeline can be closed;

    a control cylinder for controlling the jib lifting, the control cylinder comprising an upper chamber and a lower chamber which are separated by a control piston, wherein the control piston comprises a control piston rod operably connected to the jib;

    a hydraulic pump for selectively supplying the pressurized hydraulic oil to the upper chamber of the control cylinder or the lower chamber of the control cylinder through a distributor via a second pipeline independent of the first pipeline;

    wherein when the hydraulic pump supplies the pressurized hydraulic oil to the upper chamber of the control cylinder through the distributor, the control piston rod drives the jib to descend, and the weight of the jib pushes against the energy storage piston rod of the energy storage cylinder so that the hydraulic oil in the lower chamber of the energy storage cylinder is pushed into the lower volume of the accumulator, hence the pressurized gas in the upper volume of the accumulator is compressed so as to recover the gravitational potential energy of the jib; and

    wherein when the hydraulic pump supplies the pressurized hydraulic oil to the lower chamber of the control cylinder through the distributor, the control piston rod drives the jib to ascend so as to lift the energy storage piston rod, thereby the compressed gas in the upper volume of the accumulator pushes the hydraulic oil in the lower volume of the accumulator into the lower chamber of the energy storage cylinder, and thus the recovered energy is released to push the energy storage piston rod for elevating the jib;

    a controller and a sensor, where the controller is connected to the distributor equipped to the hydraulic pump, the upper chamber of the energy storage cylinder, the upper chamber of the control cylinder and a hydraulic tank, respectively, and the controller is configured in such a manner that;

    the pathway from the hydraulic pump to the upper chamber of the control cylinder via the distributor is opened, when the hydraulic pump is to supply the hydraulic oil to the upper chamber of the control cylinder through the distributor, so as to allow the hydraulic pump to supply pressurized hydraulic oil to the upper chamber of the control cylinder through the distributor and the controller;

    the pathway from the upper chamber of the energy storage cylinder to the hydraulic tank is opened when the jib ascends, so as to allow the hydraulic oil in the upper chamber of the energy storage cylinder to return to the hydraulic tank via the controller;

    the pathway from the hydraulic tank to the upper chamber of the energy storage cylinder is opened when the jib descends, so as to allow the hydraulic oil in the hydraulic tank to be drawn into the upper chamber of the energy storage cylinder via the controller; and

    when the sensor detects that the pressure of the hydraulic oil, which is delivered into the upper chamber of the control cylinder by the hydraulic pump through the distributor and controller, exceeds a predetermined value, in response to a signal from the sensor, the pathway from the hydraulic pump to the upper chamber of the energy storage cylinder via the distributor is opened and the pathway from the upper chamber of the energy storage cylinder to the hydraulic tank is closed, so that the hydraulic pump can supply pressurized hydraulic oil to the upper chamber of the control cylinder and the upper chamber of the energy storage cylinder through the distributor and the controller at the same time.

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