Method and system for recovering and utilizing operating energy of crane, and crane

• US 10,359,063 B2
• Filed: 01/19/2015
• Issued: 07/23/2019
• Est. Priority Date: 11/24/2014
• Status: Active Grant

• Current Assignee: Xuzhou Heavy Machinery Company Limited (XCMG Construction Machinery Company Limited)
• Original Assignee: Xuzhou Heavy Machinery Company Limited (XCMG Construction Machinery Company Limited)
• Inventors: Shan, Zenghai, Zhang, Zhengde, Hu, Xiaodong, Zhang, Haiyan, Yuan, Conglin
• Primary Examiner(s): Leslie, Michael
• Application Number:
  US15/528,649
• Publication Number:
  US 20170268541A1
• Time in Patent Office: 1,646 Days
• Field of Search: 60414
• CPC Class Codes: B66C 13/12 Arrangements of means for transmitting pneumatic, hydraulic, or electric power to movable parts of devices
• CPC Class Codes: B66C 13/20 for non-electric drives transmitting control pulses B66C13/40
• CPC Class Codes: B66D 1/44 pneumatic of hydraulic
• CPC Class Codes: F15B 1/024 used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
• CPC Class Codes: F15B 21/14 Energy-recuperation means

Abstract

A method and a system for recovering and utilizing crane operating energy and a crane includes converting by a first hydraulic power means hydraulic energy generated by a hydraulic actuator into mechanical energy of a transmission shaft; driving, by the transmission shaft, a second hydraulic power means to rotate so as to convert the mechanical energy of the transmission shaft into mechanical energy of the second hydraulic power means; filling, by the second hydraulic power means, pressurized oil into an accumulator so as to convert the mechanical energy of the second hydraulic power means into hydraulic energy for storage.

Claims

1. A method of recovering and utilizing crane operating energy, comprising:

converting, by a first hydraulic power means, hydraulic energy generated by a hydraulic actuator into mechanical energy of a transmission shaft;

driving, by the transmission shaft, a second hydraulic power means to rotate so as to convert the mechanical energy of the transmission shaft into mechanical energy of the second hydraulic power means, further comprising;

acquiring a load torque T_h output by the first hydraulic power means to a transfer case, wherein an engine and the second hydraulic power means are connected to the first hydraulic power means via the transfer case;

acquiring a maximum recovery torque T_xmax of the second hydraulic power means;

judging whether or not T_xmax is less than T_h;

maximizing a displacement of the second hydraulic power means such that a recovery torque of the second hydraulic means T_x=T_xmax, and balancing T_h by T_x in cooperation with a braking torque of the engine, if T_xmax is less than T_h;

adjusting the displacement of the second hydraulic power means, such that the recovery torque of the second hydraulic means T_x=T_h, if T_xmax is no less than T_h; and

filling, by the second hydraulic power means, pressurized oil into an accumulator so as to convert the mechanical energy of the second hydraulic power means into hydraulic energy for storage.

2. The method according to claim 1, wherein the hydraulic actuator includes a derricking cylinder;

wherein the step of converting, by the first hydraulic power means, hydraulic energy generated by the hydraulic actuator into mechanical energy of the transmission shaft comprises;

converting, by the derricking cylinder, gravitational potential energy generated during derricking lowering of a crane arm into hydraulic energy; and

converting, by the first hydraulic power means, the hydraulic energy generated by the derricking cylinder into mechanical energy of the transmission shaft.

3. The method according to claim 1,

wherein the hydraulic actuator includes a winch motor;

wherein the step of converting, by the first hydraulic power means, hydraulic energy generated by the hydraulic actuator into mechanical energy of the transmission shaft comprises;

converting, by the winch motor, gravitational potential energy generated by a load of the crane in a lowering process of the load into hydraulic energy; and

converting, by the first hydraulic power means, the hydraulic energy generated by the winch motor into mechanical energy of the transmission shaft.

4. The method according to claim 1, further comprising:

converting, by the second hydraulic power means, the hydraulic energy released by the accumulator into mechanical energy of the transmission shaft when the crane drives the hydraulic actuator to perform an operation;

converting, by a main pump, the mechanical energy of the transmission shaft into hydraulic energy in order to drive the hydraulic actuator to perform a corresponding operation.

5. The method according to claim 4,

wherein the hydraulic actuator includes a derricking cylinder;

wherein the step of converting, by the main pump, the mechanical energy of the transmission shaft into hydraulic energy in order to drive the hydraulic actuator to perform the corresponding operation includes;

converting, by the main pump, the mechanical energy of the transmission shaft into hydraulic energy in order to drive the derricking cylinder to implement derricking lifting of a crane arm.

6. The method according to claim 4,

wherein the hydraulic actuator includes a winch motor;

wherein the step of converting, by the main pump, the mechanical energy of the transmission shaft into hydraulic energy in order to drive the hydraulic actuator to perform the corresponding operation includes;

converting, by the main pump, the mechanical energy of the transmission shaft into hydraulic energy in order to drive the winch motor to implement winching lifting of the load.

7. The method according to claim 6, in the process of converting, by the second hydraulic power means, the hydraulic energy released by the accumulator into mechanical energy of the transmission shaft, further comprising:

acquiring a load torque T_d output by the main pump;

acquiring a maximum driving torque T_xcmax that can be provided by the second hydraulic power means;

judging whether or not T_xcmax is less than T_d;

maximizing the displacement of the second hydraulic power means, such that a driving torque provided by the second hydraulic power means T_xc=T_xcmax, and driving the main pump by T_xc in cooperation with the driving torque of the engine, if T_xcmax is less than T_d;

adjusting the displacement of the second hydraulic power means, such that the driving torque provided by the second hydraulic power means T_xc=T_d, if T_xcmax is no less than T_d.

8. A system for recovering and utilizing crane operating energy, comprising:

a hydraulic actuator for generating hydraulic energy;

a first hydraulic power means;

a transmission shaft;

a second hydraulic power means; and

an accumulator for storing hydraulic energy,

wherein

the first hydraulic power means is configured to convert the hydraulic energy generated by the hydraulic actuator into mechanical energy of the transmission shaft;

the transmission shaft is configured to drive the second hydraulic power means to rotate so as to convert the mechanical energy of the transmission shaft into mechanical energy of the second hydraulic power means;

the second hydraulic power means is configured to fill the accumulator with pressurized oil so as to convert the mechanical energy of the second hydraulic power means into hydraulic energy for storage;

wherein an engine and the second hydraulic power means are connected to the first hydraulic power means via a transfer case;

the system further includes;

a first torque acquisition module configured to acquire a load torque T_h output by the first hydraulic power means to the transfer case in the process that the transmission shaft drives the second hydraulic power means to rotate so as to convert the mechanical energy of the transmission shaft into mechanical energy of the second hydraulic power means;

a second torque acquisition module configured to acquire a maximum recovery torque T_xmax of the second hydraulic power means in the process that the second hydraulic power means converts the hydraulic energy released by the accumulator into mechanical energy of the transmission shaft;

a first discrimination module configured to determine whether or not T_xmax is less than T_h;

a second displacement adjustment module configured to maximize the displacement of the second hydraulic power means when T_xmax is less than T_h according to an output of the first discrimination module, such that a recovery torque of the second hydraulic power means T_x=T_xmax, and to balance T_h by T_x in cooperation with a braking torque of the engine; and

to adjust the displacement of the second hydraulic power means to make a recovery torque of the second hydraulic power means T_x=T_h when T_xmax is not less than T_h.

9. The system according to claim 8, wherein,

the hydraulic actuator includes a derricking cylinder configured to convert gravitational potential energy generated during derricking lowering of the crane arm into hydraulic energy;

the first hydraulic power means is configured to convert the hydraulic energy generated by the derricking cylinder into mechanical energy of the transmission shaft.

10. The system according to claim 8, wherein,

the hydraulic actuator includes a winch motor for converting gravitational potential energy generated by a load of the crane in a lowering process of the load into hydraulic energy;

the first hydraulic power means is configured to convert the hydraulic energy generated by the winch motor into mechanical energy of the transmission shaft.

11. The system according to claim 8,

wherein the accumulator is further configured to release the stored hydraulic energy when the crane drives the hydraulic actuator to perform an operation;

the second hydraulic power means is further configured to convert the hydraulic energy released by the accumulator into mechanical energy of the transmission shaft;

the system further comprises a main pump configured to convert the mechanical energy of the transmission shaft into hydraulic energy in order to drive the hydraulic actuator to perform a corresponding operation.

12. The system according to claim 11, wherein

the hydraulic actuator includes a derricking cylinder configured to implement derricking lifting of a crane arm by using the hydraulic energy provided by the main pump;

the main pump is configured to convert mechanical energy of the transmission shaft into hydraulic energy and to provide the hydraulic energy to the derricking cylinder.

13. The system according to claim 11, wherein

the hydraulic actuator includes a winch motor configured to implement winching lifting of the load by using the hydraulic energy provided by the main pump;

the main pump is configured to convert the mechanical energy of the transmission shaft into hydraulic energy and to provide the hydraulic energy to the winch motor.

14. The system according to claim 13, further comprising:

a third torque acquisition module configured to acquire a load torque T_d output by the main pump in the process that the second hydraulic power means converts the hydraulic energy released by the accumulator into the mechanical energy of the transmission shaft;

a fourth torque acquisition module configured to acquire a maximum driving torque T_xcmax that can be provided by the second hydraulic power means in the process that the second hydraulic power means converts the hydraulic energy released by the accumulator into the mechanical energy of the transmission shaft; and

,

a second discrimination module configured to determine whether or not T_xcmax is less than T_d;

wherein the second displacement adjustment module is further configured to maximize the displacement of the second hydraulic power means when T_xcmax is less than T_d according to an output of the second discrimination module, such that the driving torque provided by the second hydraulic power means T_xc=T_xcmax, and to drive the main pump by T_xc in cooperation with a driving torque of the engine; and

to adjust the displacement of the second hydraulic power means when T_xcmax is no less than T_d such that the driving torque provided by the second hydraulic power means T_xc=T_d.

15. A crane including the system for recovering and utilizing crane operating energy according to claim 8.