Luffing jib cranes with means for locking the jib in the raised configuration
A technology of cranes and jibs, applied in the field of luffing jib cranes, which can solve problems such as lowering, leakage may be both inside the lifting cylinder and outside the joints or hoses of the hydraulic system, and the cantilever is not controlled
Active Publication Date: 2022-04-12
MANITOWOC CRANE GROUP FRANCE
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Problems solved by technology
[0009] However, in the particular case of cranes with hydraulic lift cylinders, when the boom should be held in a raised safety configuration, the boom is well held in both directions due to the lift cylinders, but hydraulic fluid leaks and / or The phenomenon of expansion of the hydraulic fluid can lead to compression of the lift cylinder (i.e. retraction of the movable rod), which will lead to an uncontrolled and undesired lowering of the boom, which can be particularly detrimental when the boom moves with the wind direction; this A hydraulic fluid leak can be both inside the lift cylinder and outside at the fittings or hoses of the hydraulic system
Method used
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Embodiment Construction
[0081] luffing jib crane 1 (in figure 1 shown in ) here consists of a tower crane comprising a vertical mast 10 anchored or movable on the ground carrying a rotating part 11 mainly comprising a rotating pivot 12 via an orientation device , a balance jib 13 on which a counterweight 14 is installed, and a pitch jib 2 .
[0082] The rotary pivot 12 is orientable about the vertical axis of the mast 10 and it supports a cabin 15 for driving the crane 1 .
[0083] A counter jib 13 extends substantially horizontally rearwardly from the swivel pivot 12 and it carries, inter alia, a hoisting winch 16 for lifting a load suspended from the jib 2 , and a counterweight 14 . The balancing arm 13 is suspended by means of tie rods 19 .
[0084] The hoisting winch 16 has a reel on which the hoisting cable 17 is wound, which is passed over a pulley and is then guided towards the end 21 of the jib 2 and extends until the hoisting hook 18, with or without action over the pulley, is lifted The lo...
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A crane comprising: a luffing jib (2) and a lifting cylinder (3) having a cylinder body (30) and a movable rod (31) articulated on the jib to move the jib in a lifting motion as well as in a lowering motion; and a locking device (4) adapted to co-operate with the lift cylinder to mechanically lock the rod in the deployed safety position and the boom in the raised safety configuration and the crane includes a spacer (5) , which is hinged on the cantilever and supports a stop (6), the spacer pivots between the following positions: a release position, in which the spacer is displaced, allowing the movable rod to move freely; and a locked position, in which the spacer Folded so that the stop can abut against a load-bearing surface in a ball-joint connection with the cylinder to securely hold the movable rod in the deployed safety position.
Description
technical field [0001] The present invention relates to luffing jib cranes, and in particular to luffing jib tower cranes. Furthermore, the invention relates to a luffing jib crane provided with hoisting cylinders adapted to act on the jib in order to move it both in the lifting movement and in the lowering movement. Furthermore, the invention relates to a method for locking a luffing jib in a raised safety configuration. [0002] The invention finds application in the field of tower cranes including luffing jibs. The invention can be applied to several crane structures, for example to structures made of grids and chords. Background technique [0003] A luffing jib crane is known, in particular from document WO 2017 / 109309, provided with a lifting cylinder comprising a cylinder mechanically connected to a structural element of the crane and a movable rod articulated on the luffing jib, wherein a movable rod is movable within the cylinder between at least one deployed posi...
Claims
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IPC IPC(8): B66C23/82
CPCB66C23/828B66C23/62B66C23/82B66C23/92B66C23/16B66C2700/0392B66C23/90B66C23/26F15B15/26
Inventor 西尔万·雷蒙德洛特菲·布斯基纳加布里埃尔·弗赖斯西尔万·布吕内安东尼·尚瑟内斯
Owner MANITOWOC CRANE GROUP FRANCE