ENERGY-RECOVERY GENERATION SYSTEM FOR HANDLING AND CARRYING ELECTRIC VEHICLE

• US 20130283776A1
• Filed: 11/30/2011
• Published: 10/31/2013
• Est. Priority Date: 12/28/2010
• Status: Active Grant

• Current Assignee: Sunward Intelligent Equipment Co., Ltd.
• Original Assignee: Sunward Intelligent Equipment Co., Ltd.
• Inventors: He, Qinghua, Tang, Zhongyong, Zhang, Daqing, Chen, Zheng, Gong, Jun
• Granted Patent: US 9,422,949 B2
• Time in Patent Office: Days
• US Class Current: 60/459
• CPC Class Codes: B66F 9/22 Hydraulic devices or systems
• CPC Class Codes: F15B 15/00 Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
• CPC Class Codes: F15B 21/14 Energy-recuperation means
• CPC Class Codes: F15B 2211/20569 capable of working as pump and motor
• CPC Class Codes: F15B 2211/3116 the pump port being open in the centre position, e.g. so-called open centre
• CPC Class Codes: F15B 2211/615 Filtering means
• CPC Class Codes: F15B 2211/6313 the pressure being a load pressure
• CPC Class Codes: F15B 2211/88 Control measures for saving energy

Abstract

An energy-recovery generation system for a handling and carrying electric vehicle, comprising a hoisting cylinder (9), wherein an output pipeline of the hoisting cylinder (9) is provided with a pressure sensor unit (1) and a directional valve (2); the directional valve (2) is under the control of the pressure sensor unit (1); a first outlet of the directional valve (2) is connected to a tank (5) through a way of a multi-way valve (4) with an operating handle; the pressure oil, flowing out from a second outlet of the directional valve (2), passes through a pump (7) having an oil suction port capable of bearing pressure or a motor, and then passes through the multi-way valve (4), to finally flow back to the tank (5); the pump (7) having an oil suction port capable of bearing pressure or the motor drives an electric motor (16) to output electric energy; an electric energy output end of the electric motor (16) is connected to an energy storage device (20) through a converter (21).

Claims

1. An energy-recovery generation system for a handling and carrying electric vehicle, comprising:

a hoisting cylinder having an output pipeline provided with a pressure sensor unit and a directional valve;

the directional valve (2) is under the control of the pressure sensor unit (1);

a first outlet of the directional valve is connected to a tank via a multi-way valve with an operating handle;

pressure oil is configured to flow out from a second outlet of the directional valve, pass through a pump having an oil suction port capable of bearing pressure or through a motor, and then pass through the multi-way valve, to finally flow back to the tank;

the pump or the motor drives an electric motor to output electric energy; and

an electric energy output end of the electric motor is connected to an energy storage device through a converter.

2. The energy-recovery generation system according to claim 1, wherein the multi-way valve with the operating handle is a mechanically-operated multi-way valve, an electrically-controlled multi-way valve or a hydraulically-controlled multi-way valve.

3. The energy-recovery generation system according to claim 1, wherein the pressure sensor unit is a pressure switch or a pressure sensor.

4. The energy-recovery generation system according to claim 1, further comprising:

a lifting piece handle button,

a cargo lowering detection enabling signaling switch,

a speed control signal potentiometer, and

a relay,

wherein the pressure sensor unit comprises a pressure switch and a hoisting cylinder full-extension detection switch;

the relay (K1) comprises a first normal open switch (K1-1) and a second normal open switch (K1-2);

the hoisting piece handle button (S), the cargo lowering detection enabling signaling switch (SQ), the pressure switch (SP) and a coil of the relay (K1) are connected in series to form a first control branch; and

the second normal open switch (K1-2) of the relay (K1) and a coil (11) of an electromagnet for controlling the directional valve (2) are connected in series to form a second control branch.

5. The energy-recovery generation system according to claim 1, wherein a pipeline between an inlet of the pump or the motor and the tank is provided with a check valve.

6. The energy-recovery generation system according to claim 1, wherein:

the directional valve comprises a first reversing unit body and a second reversing unit body;

an oil supply path is formed among an oil outlet of the pump or the motor, the multi-way valve, the directional valve and a working chamber of the hoisting cylinder;

a first oil discharge path is formed among the working chamber of the hoisting cylinder, the first reversing unit body of the directional valve, the multi-way valve and the tank;

a second oil discharge path is formed among the working chamber of the hoisting cylinder, the first reversing unit body and the second reversing unit body of the directional valve, and the oil inlet of the pump or the motor; and

the first oil discharge path and the second oil discharge path are selectively communicated by the directional valve when the hoisting cylinder drains oil.

7. The energy-recovery generation system according to claim 6, wherein:

the first reversing unit body comprises a first cartridge valve, an electromagnetic directional valve, and a first damping orifice connected to the first cartridge valve and the electromagnetic directional valve;

the second reversing unit body comprises a second cartridge valve, an electromagnetic directional valve, and a second damping orifice connected to the second cartridge valve and to a second control oil port;

a II port and a IV port of the first cartridge valve are normally communicated;

a I port of the first cartridge valve is always communicated with the II port and the IV port, and the connection or disconnection from the II port and the IV port to the I port is under the control of the electromagnetic directional valve;

a i port and a iv port of the second cartridge valve are normally communicated, the i port is always communicated with the ii port and the iv port, and the connection or disconnection from the ii port and the iv port to the i port is under the control of the electromagnetic directional valve, and the power on or off of the electromagnetic directional valve respectively controls a control port of the first cartridge valve or that of the second cartridge valve to be in a communicated state.

8. The energy-recovery generation system according to claim 4, further comprising:

a first control mode constituted by a pressure switch latching valve, wherein a first branch is constituted by connecting the hoisting piece handle button, the enabling signaling switch and the hoisting cylinder full-extension detection switch in series;

a first sub-branch constituted by connecting the pressure switch and the relay in series and a second sub-branch constituted by a coil of an electromagnet of the pressure switch latching valve are connected in parallel at one end of the first branch, where the hoisting cylinder full-extension detection switch is located, to form the first control branch;

the first normal open switch and a coil of an electromagnet of the electromagnetic directional valve of the directional valve are connected in series to form the second control branch;

the second normal open switch provides a lowering enabling signal;

the speed control signal potentiometer provides a lowering speed control signal; and

the lowering enabling signal and the speed control signal are accessed to an intelligent display or a controller of the converter.

9. The energy-recovery generation system according to claim 4, further comprising:

a second control mode constituted by a time relay and an intermediate relay, wherein the time relay comprises a first normal close switch, the intermediate relay comprises a third normal open switch and a second normal close switch;

the hoisting piece handle button, the enabling signaling switch and the hoisting cylinder full-extension detection switch are connected in series to form a first branch;

a I sub-branch constituted by connecting the pressure switch, the first normal close switch and a coil of the intermediate relay in series, a II sub-branch constituted by connecting the third normal open switch and the coil of the relay, and a III sub-branch constituted by connecting the second normal close switch and a coil of the time relay in series are connected in parallel at one end of the first branch, where the hoisting cylinder full-extension detection switch is located, to form a third control branch;

the first normal open switch and a coil of an electromagnet of the electromagnetic directional valve of the directional valve are connected in series to form the second control branch;

the second normal open switch provides a lowering enabling signal;

the speed control signal potentiometer provides a lowering speed control signal; and

the lowering enabling signal and the speed control signal are accessed to an intelligent display or a controller of the converter.

10. The energy-recovery generation system according to claim 4, further comprising:

a third control mode constituted by an intermediate relay, a resistor and a transistor, wherein the intermediate relay comprises a first normal close switch and a second normal close switch;

the hoisting piece handle button, the enabling signaling switch and the hoisting cylinder full-extension detection switch are connected in series to form a first branch;

a i sub-branch constituted by connecting the normal close switch and the coil of the relay in series, a ii sub-branch constituted by connecting the resistor, the pressure switch and the second normal close switch in series, and a iii sub-branch constituted by connecting a coil of an intermediate relay, a collector and an emitter of the transistor in series are connected in parallel at one end of the first branch where the hoisting cylinder full-extension detection switch is located;

a base of the transistor is connected between the resistor of the ii sub-branch and the pressure switch to form a fourth control branch;

the first normal open switch and a coil of an electromagnet of the electromagnetic directional valve of the directional valve are connected in series to form the second control branch;

the second normal open switch provides a lowering enabling signal;

the speed control signal potentiometer provides a lowering speed control signal; and

the lowering enabling signal and the speed control signal are accessed to an intelligent display or a controller of the converter.

11. The energy-recovery generation system according to claim 3, further comprising:

a lifting piece handle button, a cargo lowering detection enabling signaling switch, a speed control signal potentiometer and a relay, wherein the pressure sensor unit comprises a pressure switch and a hoisting cylinder full-extension detection switch;

the relay comprises a first normal open switch and a second normal open switch;

the hoisting piece handle button, the cargo lowering detection enabling signaling switch, the pressure switch and a coil of the relay are connected in series to form a first control branch; and

the second normal open switch of the relay of an electromagnet for controlling the directional valve are connected in series to form a second control branch.

12. The energy-recovery generation system according to claim 2, wherein a pipeline between an inlet of the pump or the motor and the tank is provided with a check valve.

13. The energy-recovery generation system according to claim 3, wherein a pipeline between an inlet of the pump or the motor and the tank is provided with a check valve.

14. The energy-recovery generation system according to claim 11, further comprising:

a first control mode constituted by a pressure switch latching valve, wherein a first branch are constituted by connecting the hoisting piece handle button, the enabling signaling switch and the hoisting cylinder full-extension detection switch in series;

a first sub-branch constituted by connecting the pressure switch and the relay in series and a second sub-branch constituted by a coil of an electromagnet of the pressure switch latching valve are connected in parallel at one end of the first branch, where the hoisting cylinder full-extension detection switch is located, to form the first control branch;

the first normal open switch and a coil of an electromagnet of the electromagnetic directional valve of the directional valve are connected in series to form the second control branch;

the second normal open switch provides a lowering enabling signal;

the speed control signal potentiometer provides a lowering speed control signal; and

the lowering enabling signal and the speed control signal are accessed to an intelligent display or a controller of the converter.

15. The energy-recovery generation system according to claim 11, further comprising:

a second control mode constituted by a time relay and an intermediate relay, wherein the time relay comprises a first normal close switch, the intermediate relay comprises a third normal open switch and a second normal close switch;

the hoisting piece handle button, the enabling signaling switch and the hoisting cylinder full-extension detection switch are connected in series to form a first branch;

a I sub-branch constituted by connecting the pressure switch, the first normal close switch and a coil of the intermediate relay in series, a II sub-branch constituted by connecting the third normal open switch and the coil of the relay, and a III sub-branch constituted by connecting the second normal close switch and a coil of the time relay in series are connected in parallel at one end of the first branch, where the hoisting cylinder full-extension detection switch is located, to form a third control branch;

the first normal open switch and a coil of an electromagnet of the electromagnetic directional valve of the directional valve are connected in series to form the second control branch;

the second normal open switch provides a lowering enabling signal;

the speed control signal potentiometer provides a lowering speed control signal; and

the lowering enabling signal and the speed control signal are accessed to an intelligent display or a controller of the converter.

16. The energy-recovery generation system according to claim 11, further comprising:

a third control mode constituted by an intermediate relay, a resistor and a transistor, wherein the intermediate relay comprises a first normal close switch and a second normal close switch;

the hoisting piece handle button, the enabling signaling switch and the hoisting cylinder full-extension detection switch are connected in series to form a first branch;

a i sub-branch constituted by connecting the normal close switch and the coil of the relay in series, a ii sub-branch constituted by connecting the resistor, the pressure switch and the second normal close switch in series, and a iii sub-branch constituted by connecting a coil of an intermediate relay, a collector and an emitter of the transistor in series are connected in parallel at one end of the first branch where the hoisting cylinder full-extension detection switch is located;

a base of the transistor is connected between the resistor of the ii sub-branch and the pressure switch to form a fourth control branch;

the first normal open switch and a coil of an electromagnet of the electromagnetic directional valve of the directional valve are connected in series to form the second control branch;

the second normal open switch provides a lowering enabling signal;

the speed control signal potentiometer provides a lowering speed control signal; and

the lowering enabling signal and the speed control signal are accessed to an intelligent display or a controller of the converter.