Crane jibs, jibs and hoists
A technology of cranes and jibs, applied in the field of hoisting machinery, can solve problems such as hidden safety hazards, and achieve the effect of solving hidden safety hazards
Active Publication Date: 2018-03-16
XUZHOU HEAVY MASCH CO LTD
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Problems solved by technology
[0015] The purpose of the present invention is to provide a crane jib, jib and crane, aiming to solve the problem of potential safety hazards in the prior art due to the internal leakage of the jib luffing oil cylinder of the jib luffing jib
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[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0046] The relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. At the same time, it should be understood that, for the convenience of descriptio...
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The invention discloses an accessory arm of a crane, a lifting arm of a crane, and a crane. The accessory arm comprises a rotating arm part and an accessory-arm amplitude varying oil cylinder for driving the rotating arm part to rotate so as to enable the accessory arm to vary amplitude, wherein the accessory-arm amplitude varying oil cylinder is provided with a rodless cavity and a rod cavity. The accessory arm is characterized in that the accessory-arm amplitude varying oil cylinder adopts the rodless cavity as a working cavity for supporting the rotating arm part at a working position. According to the accessory arm disclosed by the invention, when the accessory-arm amplitude varying oil cylinder supports the rotating arm part at the working position, the large cavity is used as the working cavity, and a cylinder rod is in a pressed state, so that when internal leakage occurs on the accessory-arm amplitude varying oil cylinder of the accessory arm, because the direction of the pressure generated by oil liquid is opposite to the direction of the external carrying force applied on the cylinder rod, the position of the cylinder rod can be basically unchanged; therefore, the position of the rotating arm part of the accessory arm can be basically unchanged; the phenomenon that the support of the accessory-arm amplitude varying oil cylinder to the rotating arm part of the accessory arm loses efficacy is avoided, so that the accessory arm disclosed by the invention solves the problem that because the internal leakage occurs on the accessory-arm amplitude varying oil cylinder of a drawing-cylinder variable-amplitude accessory arm in the prior art, safety risks are generated.
Description
technical field [0001] The invention relates to the field of hoisting machinery, in particular to a jib of a crane, a boom and a crane. Background technique [0002] In order to increase the hoisting height of the crane, the jib of the crane usually includes a main jib and an auxiliary jib is arranged on the jib head of the main jib or the jib head of the extension section of the main jib to increase the jib length of the jib. The main arm is supported by the turntable and the oil cylinder is luffed and telescopic to achieve angle change and boom extension and retraction to lift heavy objects. The fixed jib is a non-working luffing mechanism installed on the main arm of the crane. It changes the amplitude angle when it is empty to adjust the position of the hook or other spreaders. During the lifting and moving of heavy objects, the luffing The angle will not change, which will increase the total boom length and working range. [0003] Pull plate luffing mechanism is a kin...
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IPC IPC(8): B66C23/64
CPCB66C23/68B66C2700/03
Inventor 单增海王守伟周飞于敬利周飞鹏
Owner XUZHOU HEAVY MASCH CO LTD