SUPER-LIFTING DEVICE OF CRANE, CONTROL SYSTEM AND CONTROL METHOD THEREOF

• US 20120265411A1
• Filed: 06/24/2010
• Published: 10/18/2012
• Est. Priority Date: 12/31/2009
• Status: Abandoned Application

• Current Assignee: Hunan Sany Intelligent Control Equipment Co., Ltd., Sany Automobile Manufacture Co., Ltd.
• Original Assignee: Hunan Sany Intelligent Control Equipment Co., Ltd., Sany Automobile Manufacture Co., Ltd.
• Inventors: Deng, Lianxi, Liu, Munan, Li, Bin
• Application Number:
  US13/380,558
• Publication Number:
  US 20120265411A1
• Time in Patent Office: Days
• US Class Current: 701/50
• CPC Class Codes: B66C 13/10 for preventing cable slack control devices for rope, cable, or chain winding mechanisms, e.g. for controlling tensions, B66D1/40
• CPC Class Codes: B66C 13/18 Control systems or devices exclusively for rope, cable, or chain winding mechanisms B66D1/40
• CPC Class Codes: B66C 23/701 telescopic
• CPC Class Codes: B66C 23/78 Supports, e.g. outriggers, for mobile cranes
• CPC Class Codes: B66C 23/80 hydraulically actuated
• CPC Class Codes: B66C 23/82 Luffing gear
• CPC Class Codes: B66C 23/823 Bracing equipment acting in vertical direction
• CPC Class Codes: B66C 23/88 Safety gear for cranes in general B66C15/00; for rope, cable, or chain winding mechanisms B66D1/54
• CPC Class Codes: B66C 23/90 Devices for indicating or limiting lifting moment

Abstract

A control system for a super-lifting device of a crane comprises a pressure-detecting element (21) for detecting the pressure of a variable amplitude oil cylinder and obtaining a measured pressure value, and a control element (22) for comparing the measured pressure value with the predetermined pressure value. When the measured pressure value is larger than or equal to the predetermined pressure value, the tensioning oil cylinder (23) is shortened, therefore increasing the tensioning pressure of the tensioning oil cylinder (23), reinforcing the tension of the super-lifting cable wire in the super-lifting device, and increasing the super-lifting moment applied to the main arm by the super-lifting device, which can effectively balance the pressure of the variable amplitude oil cylinder. A control method and a super-lifting device with the above control system are disclosed.

Claims

1. A control system for a super-lifting device of a crane, comprising:

a pressure detecting element for detecting a pressure of a luffing oil cylinder of the crane and obtaining a measured pressure value;

a control element for comparing the measured pressure value with a predetermined pressure value and controlling a tensioning oil cylinder of the super-lifting device to be shortened when the measured pressure value is greater than or equal to the predetermined pressure value.

2. The control system for the super-lifting device of the crane according to claim 1, further comprising:

a tensioning pressure sensor for detecting a pressure of the tensioning oil cylinder and transmitting a tensioning pressure signal to the control element;

wherein the control element receives the tensioning pressure signal and compares a detected tensioning pressure value with a predetermined tensioning pressure value;

when the detected tensioning pressure value is greater than or equal to the predetermined tensioning pressure value, the control element controls the tensioning oil cylinder to be extended;

and when the detected tensioning pressure value is less than the predetermined tensioning pressure value, the control element controls the tensioning oil cylinder to be shortened.

3. The control system for the super-lifting device of the crane according to claim 1, further comprising:

a length detecting element for detecting a length of a super-lifting wire rope of the super-lifting device and inputting a measured length value into the control element;

wherein the control element determines the relationship between the measured length value and a length setting range;

when the measured pressure value is less than the predetermined pressure value and the measured length value is greater than a maximal length value of the length setting range, the control element controls the tensioning oil cylinder to be shortened;

and when the measured pressure value is less than the predetermined pressure value and the measured length value is less than a minimal length value of the length setting range, the control element controls the tensioning oil cylinder to be extended.

4. The control system for the super-lifting device of the crane according to claim 1, further comprising:

a state detecting element for detecting a state of a main boom of the crane and transmitting a detected state signal to the control element;

wherein the control element determines the state of the main boom according to a predetermined strategy;

and when the main boom is in a luffing state, the control element controls the pressure detecting element to detect the pressure of the luffing oil cylinder.

5. The control system for the super-lifting device of the crane according to claim 4, wherein the state detecting element is an angle sensor mounted between the main boom and a turntable of the crane.

6. A crane super-lifting device, comprising the control system according to claim 1.

11. The control system for the super-lifting device of the crane according to claim 2, further comprising:

a state detecting element for detecting a state of a main boom of the crane and transmitting a detected state signal to the control element;

wherein the control element determines the state of the main boom according to a predetermined strategy;

and when the main boom is in a luffing state, the control element controls the pressure detecting element to detect the pressure of the luffing oil cylinder.

12. The control system for the super-lifting device of the crane according to claim 3, further comprising:

a state detecting element for detecting a state of a main boom of the crane and transmitting a detected state signal to the control element;

wherein the control element determines the state of the main boom according to a predetermined strategy;

and when the main boom is in a luffing state, the control element controls the pressure detecting element to detect the pressure of the luffing oil cylinder.

13. The control system for the super-lifting device of the crane according to claim 11, wherein the state detecting element is an angle sensor mounted between the main boom and a turntable of the crane.

14. The control system for the super-lifting device of the crane according to claim 12, wherein the state detecting element is an angle sensor mounted between the main boom and a turntable of the crane.

7. A control method for a crane super-lifting device, comprising the following steps:

11) detecting a pressure of a luffing oil cylinder of a crane and obtaining a measured pressure value;

12) comparing the measured pressure value with a predetermined pressure value and if the measured pressure value is greater than or equal to the predetermined pressure value, proceeding to step 13);

if not, back to step 11);

13) controlling a tensioning oil cylinder of the super-lifting device to be shortened.

8. The control method for the crane super-lifting device according to claim 7, further comprising the following steps after step 13):

14) detecting a pressure of the tensioning oil cylinder and transmitting a tensioning pressure signal to the control element;

15) comparing the detected tensioning pressure value with a predetermined tensioning pressure value and when the detected tensioning pressure value is greater than or equal to the predetermined tensioning pressure value, proceeding to step 16);

when the detected tensioning pressure value is less than the predetermined tensioning pressure value, proceeding to step 17);

16) controlling the tensioning oil cylinder to be extended;

17) controlling the tensioning oil cylinder to be shortened.

9. The control method for the crane super-lifting device according to claim 7, wherein, in step 12), when the measured pressure value is less than the predetermined pressure value, proceeding to step 18) and executing the following steps:

18) detecting a length of a super-lifting wire rope of the super-lifting device and transmitting the measured length value to the control element;

19) determining the relationship between the measured length value and a length setting range, and if the measured length value is greater than a maximal length value of the length setting range, proceeding to step 110);

if the measured length value is less than a minimal length value of the length setting range, proceeding to step 111);

110) controlling the tensioning oil cylinder to be shortened;

111) controlling the tensioning oil cylinder to be extended.

10. The control method for the crane super-lifting device according to claim 7, further comprising the following steps before step 11):

01) detecting a state of a main boom of the crane and obtaining a state signal;

02) determining the state of the main boom, and if the main boom is in a luffing state, proceeding to step 11);

if not, proceeding to step 01).

15. The control method for the crane super-lifting device according to claim 8, further comprising the following steps before step 11):

01) detecting a state of a main boom of the crane and obtaining a state signal;

02) determining the state of the main boom, and if the main boom is in a luffing state, proceeding to step 11);

if not, proceeding to step 01).

16. The control method for the crane super-lifting device according to claim 9, further comprising the following steps before step 11):

01) detecting a state of a main boom of the crane and obtaining a state signal;

02) determining the state of the main boom, and if the main boom is in a luffing state, proceeding to step 11);

if not, proceeding to step 01).