A crawler crane and its double-hook differential speed control device based on open-loop control

Abstract

The invention discloses a double-hook differential control device based on open-loop control for a crawler crane. The double-hook differential control device comprises a control module, a main winch system and an auxiliary winch system. The main winch system comprises a first proportional valve set, a hydraulic system and a main winch which communicate with one another in sequence. The auxiliary winch system comprises a second proportional valve set, a hydraulic system and an auxiliary winch which communicate with one another in sequence. The set speed specific value of a main hook and an auxiliary hook is obtained through a PLC and is matched with the rate in a work condition parameter unit to obtain corresponding speeds of the main winch and the auxiliary winch, the opening degree of the first proportional valve set and the opening degree of the second proportional valve set are obtained according to the speed and flow characteristics of the winches, corresponding opening degree signals are output to control the opening degree of the first proportional valve set and the opening degree of the second proportional valve set, hydraulic flow needed by the hydraulic system of the main winch and the hydraulic flow needed by the hydraulic system of the auxiliary winch are controlled, the rotating speed of the main winch and the rotating speed of the auxiliary winch are adjusted, and therefore the main hook and the auxiliary hook are driven to move according to the set speed ratio. An open-loop control method is adopted in the double-hook differential control device for controlling the work of the main hook and the work of the auxiliary hook, and the application range of crawler crane construction is expanded.

Description

technical field [0001] The invention relates to a double-hook differential speed control device based on open-loop control for a crawler crane, and also relates to a double-hook crawler crane equipped with the double-hook differential speed control device, which belongs to the technical field of crane control. Background technique [0002] At present, crawler cranes at home and abroad have made great progress in terms of functionality, safety, and intelligence, and are widely used in various industries. Crawler cranes belong to mobile cranes. It is a construction machine that installs the lifting operation part on the crawler chassis and relies on the crawler device to walk. It is mainly suitable for lifting operations of medium and large projects. Crawler cranes have four major mechanisms: hoisting mechanism, luffing mechanism, slewing mechanism and traveling mechanism. Through the mutual cooperation of these mechanisms, hoisting operations in different working conditions c...

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Problems solved by technology

When the lifting height of the heavy object is high, due to the limited viewing angle of the operator, it is often impossible to ensure that the heavy object remains in a horizontal state. For some precise lifting construction conditions, this will seriously affect the installation effect

[0006] In addition, for some construction conditions, it is necessary to maintain a certain inclination angle for the heavy object to be installed. At this time, if the existing hoisting method is used, it will not be possible to ensure that the initial inclination angle of the heavy object can be maintained when it is lifted to a certain height. Therefore, for Such hoisting conditions cannot be realized by existing double-hook crawler cranes

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