Lifting arm amplitude indicating device, lifting arm and construction machinery

Abstract

The invention relates to the technical field of engineering components, in particular to a boom amplitude indicating device, a boom and construction machinery. The boom amplitude indicating device includes a chassis and a pointer (2), the pointer (2) is arranged on the chassis and can swing relative to the chassis with the movement of the boom, and the chassis includes A first scale for displaying the lifting angle of the jib and a second scale for displaying the range of lifting of the jib, the second scale being set to display the arm length of the jib The magnitude obtained by the product of the value and the cosine value of the angle, so that the pointer (2) can simultaneously indicate the first scale and the corresponding second scale. The boom amplitude indicating device, the boom and the engineering machinery can observe the lifting angle and the lifting amplitude of the boom at the same time, and can work efficiently and accurately.

Description

technical field [0001] The invention relates to the technical field of engineering components, in particular to a boom amplitude indicating device, a boom and construction machinery. Background technique [0002] Tower crane (referred to as tower crane) is a lifting device for vertically transporting goods. It is widely used in modern industrial and civil construction. The amplitude is the decisive factor for the lifting of the tower crane. The existing angle indicating device used for calculating the amplitude is usually fixed at the boom tail of the boom. When using the boom tower crane, the tower crane driver can see the angle indicated by the pointer from the driver's cab, so as to calculate and judge the approximate range of the boom tower crane hook, resulting in inability to work efficiently and accurately; at the same time, the existing angle signs need to be different Color paint, welded scale frame and rivet scale table have complicated structure, tedious manufact...

AI Technical Summary

Problems solved by technology

When using the boom tower crane, the tower crane driver can see the angle indicated by the pointer from the driver's cab, so as to calculate and judge the approximate range of the boom tower crane hook, resulting in inability to work efficiently and accurately; at the same time, the existing angle signs need to be different Color paint, welded scale frame and rivet scale table, its structure is complex, the production process is cumbersome, and there are many processes. After long-term use, the pointer rotation is not flexible and may cause sticking.

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