Crane equipped with a luffing assist device and method for luffing the crane.

Abstract

To provide a crane that can easily and safely raise longer or heavier booms without the need for external support such as auxiliary cranes. [Solution] The boom 16 is reinforced by a bracing frame 18 attached to an upper trolley so as to rotate around a horizontal pivot axis, and can be raised and lowered by rotating the bracing frame 18. According to the present invention, the crane is equipped with a luffing assist device 30 that applies torque to the boom in addition to the bracing in order to luff the boom 16 in a flat boom position. This luffing assist device 30 has an auxiliary arm 32 that is rotatably attached to an upper trolley 14, and this auxiliary arm 32 is connected to the upper trolley via a holding element and connected to the boom via a variable-length traction element 34. The traction element 34 is configured to apply a traction force to the boom in the direction of the auxiliary arm.

Claims

1. An upper trolley (14) and a part that rotates on the upper trolley (14) around a horizontal pivot axis. It has an attached boom (16), and the boom rotates about the horizontal pivot axis. The upper bogie (14) is reinforced by a bracing frame (18) attached to it. Furthermore, by rotating the bracing frame (18), it is possible to raise and lower it vertically. A crane (10), in particular a mobile lattice boom crane, Due to the elevation of the boom (16) in a flat boom position, bracing (1 9) A luffing assist device that can provide torque to the boom (16) in addition to the torque acting on it. 30) is provided, and the luffing assist device (30) is rotatably mounted on the upper trolley (14) It is connected to the upper trolley (14) via a holding element (34) and the boot The arm (16) has an auxiliary arm (32) connected to it via a variable-length traction element (36), The traction element (36) provides traction force to the boom (16) in the direction of the auxiliary arm (32). A crane (10) characterized by being configured in such a way.

2. In the crane (10) described in claim 1, The traction element (36) is articulated to the auxiliary arm (32) and the boom (16). They are connected in a manner, preferably on the boom (16) throughout the entire operation of the crane. Maintain the connected state, preferably also maintaining the connected state to the auxiliary arm (32). A crane (10) configured to be a crane.

3. In the crane (10) according to claim 1 or 2, The bracing frame (18) has an actively adjustable bracing cabling (20) is connected to the upper trolley (14), and the bracing cabling (2 0) A brake attached to a cable winch (24) that can be wound up and unwound. Including a single cable (22), the cable winch (24) is the bracing cable By winding up the cable (22), the bracing frame (18) is raised to the upper The bracing frame (18) is connected by rotating it toward the rear of the trolley. The boom (16) is configured to be raised and lowered via the bracing (19). A crane (10) is being used.

4. In the crane (10) according to any one of claims 1 to 3, The traction element (36) is connected to the bracing (19) and the bracing frame (1 8) The crane (10), which is a separate component from the boom (16).

5. In the crane (10) according to any one of claims 1 to 4, The traction element (36) is capable of actively adjusting its length, preferably the boom (1 6) When the boom (16) is erected, a constant or variable traction force is applied to it. A crane (10) that is controllable and / or adjustable.

6. In the crane (10) described in claim 5, The traction element (36) is configured as a hydraulic cylinder, and the traction element (36) is preferably By being configured as a double-acting hydraulic cylinder, both traction and compression forces are applied to the aforementioned buoyancy. A crane (10) that can be used on the m (16).

7. In the crane (10) according to claim 6, The traction element (36) is in the first angular range of the boom (1) 6) The traction element (36) is provided with traction to assist the undulation process by adding traction force to the 6) Controlled and / or via at least one hydraulic pump and control unit of lane (10) The crane (10) can be adjusted.

8. In the crane (10) according to claim 7, The traction element (36) is positioned in the third angular range of the boom (16) relative to the upper trolley. (14) is configured to apply a compressive force to the boom (16) in a direction away from the front The boom (16) has a boom position that is steeper than the first angular range, The control unit is preferably operated by control using a characteristic curve in the third angular range. So that oil flows out of or into the traction element (36) A crane (10) characterized by its configuration.

9. In the crane (10) according to any one of claims 6 to 8, The traction element (36) is configured as a fallback support, and the auxiliary arm ( 32) Preferably when the traction element (36) is in fallback support mode A crane configured to function as an abutment for a towing element (36). （１０）。

10. In the crane (10) according to any one of claims 6 to 9, The system further comprises a measuring device that is communicatively connected to a control unit, and the control unit is front The switch of the traction element (36) is turned off according to the variable detected by the measuring device. It is configured to do so, The measuring device preferably comprises at least, The boom (16), the bracing frame (18) and / or the auxiliary arms At least one sensor for detecting the angle of m (32), The bracing (19), the retaining element (34) and / or the traction element (36 A crane (10) is equipped with at least one sensor for detecting the force of ).

11. In the crane (10) according to any one of claims 1 to 10, The bracing frame (18) and the auxiliary arm (32) rotate independently of each other. It is possible, and the auxiliary arm (32) is preferably passively rotatable, and the Boo The boom (16) via the traction element (36) in the second angular range of the boom (16) A crane (10) that follows the rotational movement of the boom (16) through connection with the crane (10).

12. In the crane (10) according to any one of claims 1 to 11, The holding element (34) is flexible, and preferably a crane (1) has a traction cable. ０）。

13. In the crane (10) according to any one of claims 1 to 12, The holding element (34) provides fallback support for the traction element (36) in the fallback support mode. It is mounted on an upper trolley (14) and is characterized in that it is designed to be free from any load. A crane (10) is used for this purpose.

14. The boom (16) of the crane (10) according to any one of claims 1 to 13 is raised and lowered. It is a method to do so, The boom (16) is provided in a flat, preferably horizontally positioned boom position. Step, In order to apply upward torque to the boom (16), the bracing frame (1 8) is rotated backward, and at the same time the traction force toward the auxiliary arm (32) is directed toward the boom (1 6) A step of providing traction to the undulation process via the traction element (36), By continuing the rotation of the bracing frame (18), the boom (16) Steps to create uneven surfaces, and Preferably, when the predetermined angle is exceeded and / or the predetermined force is not reached. , step of switching off the traction element (36) A method of having.

15. In the method according to claim 14, The traction element (36) preferably operates only at a specific boom angle and otherwise does not swing. The fallback support of the boom (16) after the ascent process when the switch is turned off A method used as a tool.

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