Pivoting support, boom system and elevating fire truck

Abstract

Disclosed is a rotary bearing, comprising a first collar (61a), a second collar (61b), a first gear ring (62), a second gear ring (63), a first ring roller (64), a second ring roller (65), a third ring roller (66), a first drive device (67), a second drive device (68) and a third drive device (69), wherein the first gear ring (62) and the second gear ring (63) are arranged between the first collar (61a) and the second collar (61b), the first collar (61a) and the first gear ring (62) are joined via the first ring roller (64) to form a first counter-rotating surface set, the first gear ring (62) and the second gear ring (63) are joined via the second ring roller (65) to form a second counter-rotating surface set, the second gear ring (63) and the second collar (61b) are joined via the third ring roller (66) to form a third counter-rotating surface set, the second counter-rotating surface set forms an inclined angle in relation to the first counter-rotating surface set and the third counter-rotating surface set, the first drive device (67) is used for driving the rotation of the first gear ring (62) relative to the first collar (61a), the second drive device (68) is used for driving the rotation of the first gear ring (62) relative to the second gear ring (63), and the third drive device (69) is used for driving the rotation of the second gear ring (63) relative to the second collar (61b).

Description

technical field [0001] The invention relates to the technical field of construction machinery, in particular to a boom system and a slewing support for boom-type construction machinery such as cranes and concrete pump trucks, and special vehicles such as aerial work vehicles and elevating fire trucks. Background technique [0002] In the current construction machinery (such as cranes, concrete pump trucks) and special vehicles (such as aerial work vehicles, elevating fire trucks) with boom systems, the extension of the boom system is used to expand the working area. The lifting cylinder lifts the boom so that the whole boom can be extended to transport people or objects to the predetermined working area to achieve its working purpose. [0003] In accordance with national safety standards, before the boom is extended, it is necessary to ensure that the boom is in a horizontal state. For example, for elevating fire trucks (ladder fire trucks, climbing platform fire trucks, el...

AI Technical Summary

Problems solved by technology

[0008] 1. The outrigger cylinder is too long and heavy, making it difficult to design and manufacture;

[0009] 2. The leveling speed is slow, and the outrigger cylinder needs to ensure a certain movement accuracy to ensure the accuracy of the adjustment angle, and cannot be extended quickly;

[0010] 3. The leveling accuracy is average. Since it is a four-point support (for a statically indeterminate structure), and the oil cylinder itself has a certain degree of elasticity (for oil compression), it requires a lot of repeated control during leveling;

[0011] 4. When the span of the outrigger is large and a larger angle needs to be adjusted (such as adjusting to 8° according to European standards), the existing technology is very difficult to achieve (the oil cylinder needs to be super long, and there are problems such as inability to install)

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