Overturning-preventing torque limiter and movable crane

Abstract

The invention discloses an overturning-preventing torque limiter system which is used for a movable crane and comprises a detection unit, a controller unit and a display unit, wherein the detection unit comprises a length sensor for detecting the length of a jib loading boom, an angle sensor for detecting the working angle of the jib loading boom, and a pressure sensor for detecting the hoisting weight; and the detection unit further comprises an anemobiagraph, a rotary speed sensor, a gradienter and a lifting speed sensor. According to the torque limiter system, a working state of the movable crane can be accurately reflected, torque generated by a hoisting weight, wind force, inertia force and centrifugal force in a working process is calculated, further amplitude angle, speed and acceleration, rotary speed, weight lifting speed and acceleration of the crane can be controlled, thus overturning accident caused by dynamic instability of the movable crane is prevented. The invention also discloses a mobile crane provided with the overturning-preventing torque limiter system.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to an anti-overturning moment limiter system of a crane. The invention also relates to a mobile crane provided with said anti-tipping moment limiter system. Background technique [0002] As a special engineering vehicle, mobile cranes have the functions of driving and lifting operations, and are widely used in the installation and maintenance of equipment in petrochemical, shipbuilding, wind power and other industries. [0003] With the rapid development of the economy, the lifting weight of crane products required in engineering applications is increasing, and the requirements for their performance and functions are also increasing. At the same time, the safety, reliability, stability and operation of vehicles Convenience etc. also present considerable challenges. [0004] Mobile crane is a kind of construction machinery with many dangerous factors and high probabil...

AI Technical Summary

Problems solved by technology

[0006] During the lifting operation of the crane, the stable state may be within the safe torque range, but when the crane performs multiple actions or changes suddenly, the additional moment generated by inertial force and centrifugal force will greatly increase

Especially when operating at full load or close to full load, if only the weight of the lifted object is considered, the crane is likely to cause tipping accidents when suddenly changing the lifting, luffing and slewing operations

[0007] The existing torque limiter system can only limit the movement of the crane after overloading. There is no detection and calculation for the dynamic instability in the operation process and corresponding limiting measures, let alone predict how much additional torque will be generated in the next action, and thus cannot Make restrictions on worker operations

[0008] First, the influence of wind load and boom deformation is not considered. When the wind load acts on the boom, the overturning moment will be reflected on the thrust of the luffing hydraulic cylinder; when the wind load acts on the side of the boom, there will be Lateral overturning moment, which makes the hoisting or lowering of the weight deviate from the plumb line to generate an additional overturning moment, which cannot be reflected in the existing moment limiter system

[0009] Secondly, due to the large lateral span of the outrigger, the stability of the outrigger and the inertial load when working with load, the amplitude and load increase are not reflected in the moment limiter system.

[0010] Furthermore, it is impossible to calculate the dynamic torque generated during the working process, and it can only react after exceeding the dangerous range, which has potential safety hazards

[0011] Using the existing torque limiter system, although the operation can be carried out relying on the experience of the operator, when the operation is full or close to full load, the moment generated by wind force, inertial force and centrifugal force will increase the possibility of the crane tipping over

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