Crane having an apparatus for determining the effective counterweight of said crane

Patent metadata

Field	Value
Publication number	US-10486945-B2
Application number	US-201715839094-A
Country	US
Kind code	B2
Filing date	Dec 12, 2017
Priority date	Dec 7, 2016
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

The invention relates to a crane having at least one apparatus for determining the effective counterweight of said crane comprising at least one receiver for receiving at least one counterweight body; at least one coupling that is configured to pivotably couple the receiver with the further structure of the crane; and at least one abutment that is configured to limit the pivot range of the receiver.

First claim

The invention claimed is:

1. A crane ( 10 ) comprising at least one apparatus for determining the effective counterweight of the crane ( 10 ), having
at least one receiver ( 2 ) configured for receiving at least one counterweight body ( 3 );
at least one coupling ( 5 ) configured to pivotably couple the receiver ( 2 ) with the further structure of the crane ( 10 ); and
at least one abutment ( 7 ) configured to limit the pivot range of the receiver ( 2 ), wherein
at least one force measurement device ( 6 ) is provided in and/or at the abutment ( 7 ) and is configured to determine the force introduced into the abutment ( 7 ) by the receiver ( 2 ).

2. A crane ( 10 ) in accordance with claim 1 , wherein the force measurement device ( 6 ) comprises a piston and cylinder apparatus ( 61 , 62 ), that is in particular hydraulic.

3. A crane ( 10 ) in accordance with claim 1 , wherein at least one spring ( 63 ) is provided that is configured to press the piston rod ( 62 ) at least partly into the cylinder ( 61 ).

4. A crane ( 10 ) in accordance with claim 1 , wherein the cylinder space of the cylinder ( 61 ) is preloaded at a system pressure of 10-50 bar, in particular of 20-40 bar, and further in particular of 30 bar+/−5 bar.

5. A crane ( 10 ) in accordance with claim 1 , wherein the backflow of a pressure medium from the cylinder ( 61 ) is blockable via a check valve ( 64 ).

6. A crane ( 10 ) in accordance with claim 1 , wherein the force measurement device ( 6 ) is configured as a pressure meter ( 65 ) for measuring the pressure within the cylinder ( 61 ).

7. A crane ( 10 ) in accordance with claim 6 , wherein a crane regulation/control is provided that is configured to calculate the effective counterweight from the measured pressure.

8. A crane ( 10 ) in accordance with claim 1 , wherein a safety device is provided that is configured to limit the maximum pressure in the measurement circuit to in particular 400 bar.

9. A crane ( 10 ) in accordance with claim 2 , wherein the piston rod ( 62 ) is designed as spherical at its support surface.

10. An apparatus for determining the effective counterweight at a crane ( 10 ), wherein the apparatus comprises at least one abutment ( 7 ) that is configured to limit the pivot range of a receiver ( 2 ) for the counterweight.

11. A crane ( 10 ) in accordance with claim 2 , wherein at least one spring ( 63 ) is provided that is configured to press the piston rod ( 62 ) at least partly into the cylinder ( 61 ).

12. A crane ( 10 ) in accordance with claim 11 , wherein the cylinder space of the cylinder ( 61 ) is preloaded at a system pressure of 10-50 bar, in particular of 20-40 bar, and further in particular of 30 bar+/−5 bar.

13. A crane ( 10 ) in accordance with claim 3 , wherein the cylinder space of the cylinder ( 61 ) is preloaded at a system pressure of 10-50 bar, in particular of 20-40 bar, and further in particular of 30 bar+/−5 bar.

14. A crane ( 10 ) in accordance with claim 2 , wherein the cylinder space of the cylinder ( 61 ) is preloaded at a system pressure of 10-50 bar, in particular of 20-40 bar, and further in particular of 30 bar+/−5 bar.

15. A crane ( 10 ) in accordance with claim 14 , wherein the backflow of a pressure medium from the cylinder ( 61 ) is blockable via a check valve ( 64 ).

16. A crane ( 10 ) in accordance with claim 13 , wherein the backflow of a pressure medium from the cylinder ( 61 ) is blockable via a check valve ( 64 ).

17. A crane ( 10 ) in accordance with claim 12 , wherein the backflow of a pressure medium from the cylinder ( 61 ) is blockable via a check valve ( 64 ).

18. A crane ( 10 ) in accordance with claim 11 , wherein the backflow of a pressure medium from the cylinder ( 61 ) is blockable via a check valve ( 64 ).

19. A crane ( 10 ) in accordance with claim 4 , wherein the backflow of a pressure medium from the cylinder ( 61 ) is blockable via a check valve ( 64 ).

20. A crane ( 10 ) in accordance with claim 3 , wherein the backflow of a pressure medium from the cylinder ( 61 ) is blockable via a check valve ( 64 ).

Assignees

• Liebherr Werk Ehingen

Inventors

• Willim Hans-Dieter

Classifications

• B66C23/88

  Safety gear (for cranes in general B66C15/00; for rope, cable, or chain winding mechanisms B66D1/54) · CPC title

• B66C13/16 Primary

  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

• G01L7/163

  construction or mounting of pistons · CPC title

• B66C23/74

  separate from jib · CPC title

• G01L5/0061

  Force sensors associated with industrial machines or actuators (for the specific machine or actuator involved see relevant class, e.g. F01, F04, F16, B66, E21) · CPC title