Method for determining the rope reeving of a pulley block

Patent metadata

Field	Value
Publication number	US-11999601-B2
Application number	US-201916578056-A
Country	US
Kind code	B2
Filing date	Sep 20, 2019
Priority date	Sep 21, 2018
Publication date	Jun 4, 2024
Grant date	Jun 4, 2024

Abstract

The disclosure relates to a method for determining the number of rope reevings of a pulley block with a top block and a bottom block, wherein the rope path of at least one rope line of the pulley block, which is covered during a time window, is detected and compared with at least one rope path of a further rope line covered within the time window and/or with the height difference between top block and bottom block changed within the time window, in order to determine the number of rope reevings of the pulley block.

First claim

The invention claimed is:

1. A method comprising:
providing a pulley block with a top block and a bottom block; and
determining a number of rope reevings of the pulley block, wherein a rope path of a first rope line of the pulley block, which is covered during a time window, is detected, via sensors, and compared, via programming executed by a control unit, with at least one rope path of a further rope line of the pulley block covered within the time window and/or with a height difference between the top block and the bottom block changed within the time window, in order to determine the number of rope reevings of the pulley block, wherein each rope path corresponds to a length of rope let out or drawn in, wherein each rope path covered during the time window corresponds to the length of rope let out or pulled in during the time window, wherein the number of rope reevings in the pulley block is automatically determined using the sensors and the control unit during the time window in which the pulley block is actuated.

2. The method according to claim 1 , wherein the rope path of at least one rope line is measured by a rope pulley of the pulley block forming the rope line path and/or is detected by at least one additional measuring roller which rolls off on the rope line.

3. The method according to claim 2 , wherein the rope path is measured via an incremental revolution measurement of the rope pulley or measuring roller.

4. The method according claim 1 , wherein the rope path of the first rope line of the pulley block is measured by a hoisting rope winch of the pulley block, wherein the measured rope path corresponds to a length of hoisting rope wound or unwound upon the hoisting rope winch within the time window and a measurement is carried out by an incremental revolution measurement on the hoisting rope winch.

5. The method according to claim 4 , wherein the rope path of the first rope line is determined by the rope path wound onto or unwound from the hoisting rope winch and is divided by the detected change of the height difference between the top block and the bottom block, wherein the resulting quotient corresponds to the number of rope reevings.

6. The method according to claim 4 , wherein the rope path of the first rope line is determined by the rope path wound onto or unwound from the hoisting rope winch and is compared to a determined rope path of a succeeding rope line of the pulley block.

7. The method according to claim 6 , wherein the number of rope reevings is determined by matching a calculated ratio from both rope path values with reference table values.

8. The method according to claim 1 , wherein the change of the height difference between the top block and the bottom block is determined using a rope path measurement on a last rope line extending from a last rope pulley of the top block of the pulley block.

9. The method according to claim 1 , wherein the change of the height difference between the top block and the bottom block is measured using a mechanical length sensor and/or an optical, laser-based and/or runtime-based measurement method.

10. The method according to claim 1 , wherein at least two rope path measurements are carried out on rope lines of the pulley block spaced apart as far as possible.

11. The method according to claim 10 , wherein the at least two rope path measurements include a first measurement carried out on the first rope line and a second measurement carried out on a last rope line extending from a last rope pulley of the top block of the pulley block.

12. The method according claim 1 , wherein the method is executed by a crane control unit of a crane in order to determine the number of rope reevings at a hook block or another pulley block of the crane.

13. A system comprising:
a pulley block with a top block and a bottom block; and
a device including a measuring device and an evaluation unit, the device configured to carry out a method for determining a number of rope reevings of the pulley, wherein a rope path of a first rope line of the pulley block, which is covered during a time window, is detected, via sensors, and compared, via programming executed by a control unit, with at least one rope path of a further rope line of the pulley block covered within the time window and/or with a height difference between the top block and the bottom block changed within the time window, wherein the measuring device includes the sensors configured to detect the at least two rope paths during the time window, wherein the evaluation unit includes the control unit configured to calculate the rope reeving on the basis of measurement values, wherein each rope path corresponds to a length of rope let out or drawn in, wherein each rope path covered during the time window corresponds to the length of rope let out or pulled in during the time window, wherein the number of rope reevings in the pulley block is automatically determined using the control unit and the sensors during the time window in which the pulley block is actuated.

14. A crane comprising:
a pulley block with a top block and a bottom block; and
a control unit configured to communicate with at least two sensors for a rope path measurement on the pulley block, wherein the crane control unit is programmed to carry out a method for determining a number of rope reevings of the pulley block, wherein a rope path of a first rope line of the pulley block, which is covered during a time window, is detected, via the at least two sensors, and compared, via programming executed by the control unit, with at least one rope path of a further rope line of the pulley block covered within the time window and/or with a height difference between the top block and the bottom block changed within the time window, wherein each rope path corresponds to a length of rope let out or drawn in, wherein each rope path covered during the time window corresponds to a length of rope let out or pulled in during the time window, wherein the number of rope reevings in the pulley block is automatically determined using the control unit and the at least two sensors during the time window in which the pulley block is actuated.

15. The crane control unit according to claim 14 , wherein the control unit comprises a program application stored on a data carrier for the control unit for executing the method.

Assignees

• Liebherr Werk Ehingen

Inventors

• Windbacher Stefan
• Wehrstedt Julian
• Wenger Hans-Joachim

Classifications

• B66D3/043 Primary

  Block and tackle system with variable number of cable parts · CPC title

• B66C13/16

  Applications of indicating, registering, or weighing devices (in crane hooks B66C1/40; in safety gear B66C15/00; weighing-apparatus G01G; remote indicating in general G08) · CPC title

• B66D3/04

  Pulley blocks or like devices in which force is applied to a rope, cable, or chain which passes over one or more pulleys, e.g. to obtain mechanical advantage (sheaves F16H55/00) · CPC title

• G01B5/02

  for measuring length, width or thickness (G01B5/004, G01B5/08 take precedence) · CPC title

• G01B11/02

  for measuring length, width or thickness (G01B11/08 takes precedence) · CPC title