Method, device and system for controlling pre-tightening force of super lift device
A technology of a super-lifting device and a control method, which is applied in the direction of the hoisting device and the spring mechanism, etc., can solve the problems of low accuracy of the pre-tightening force of the hoisting rope, large fluctuation of the oil cylinder pressure, and difficult detection.
Active Publication Date: 2013-01-23
SANY HEAVY IND CO LTD (CN)
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Problems solved by technology
[0004] In view of this, the present invention proposes a super-lifting device pretension control method, control device and control system to solve the problem in the prior art that the hoisting rope preload determined by the pressure is caused by large fluctuations in the oil cylinder pressure and is difficult to detect. The problem of low tightening accuracy
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[0026] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0027] Control method embodiment:
[0028] see figure 2 , the figure shows a preferred embodiment of the method for controlling the pre-tightening force of the super-lifting device of the present invention. This embodiment is used to figure 1 The hoisting rope 2 applies a preload, and the following combination figure 1 , to further describe this embodiment.
[0029] As shown in the figure, the method includes the following steps: a pre-tightening force applying step S1, turning on the hoisting motor, and applying a pre-tightening force to the hoisting rope 3; a pressure detection step S2, detecting the hoisting motor or the oil cylinder 4 of the super-lifting device The pressure value; Pret...
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The invention discloses a method, a device and a system for controlling pre-tightening force of a super lift device. The method for controlling the pre-tightening force of the super lift device comprises the following steps of: starting a winch motor, and applying the pre-tightening force to a winch rope; detecting the pressure value of the winch motor or an oil cylinder of the super lift device; determining the pre-tightening force which is applied to the winch rope of the super lift device according to the pressure value; when the pre-tightening force reaches the targeted value, locking a winding drum moving around the winch rope, and calculating the length of the rope unreeled by the winding drum in the locking process; and correspondingly adjusting the extending length of a piston rod of the oil cylinder according to the rope unreeling length. According to the method, the pre-tightening force is not used as a stop parameter in the process of supplementing the pre-tightening force by the oil cylinder, and the length of the winch rope which is unreeled by the winding drum in the locking process is used as a parameter; compared with the prior art, the method has the advantages that the angle value of a rotary roller or a pulley which is used for calculating the rope unreeling length is easy to detect and is very stable in the working process of an erector arm; the measuring range of an angular transducer can be selected according to the rope unreeling length; and the accuracy of the pre-tightening force is guaranteed.
Description
technical field [0001] The invention relates to the field of engineering machinery, in particular to a method for controlling the pretightening force of a superlift device, a control device and a control system. Background technique [0002] At present, with the rapid development of economic construction, cranes are also developing in the direction of large tonnage. Large-tonnage cranes are generally equipped with super-lifting devices on the boom to improve lifting performance. The structure of the superlift device is generally as follows figure 1 Shown, comprise superlift arm 5, hoisting device and hydraulic oil cylinder 4. Wherein, the super lifting arm 5 is hinged with the lifting arm 1 . The hoisting device includes a reel 3 , a hoisting motor (not shown in the figure) and a hoisting rope 2 . The hoisting rope 2 is wound on the reel 3 , and the hoisting motor provides power for the reel 3 . The hoisting rope 2 goes around the pulley arranged at the end of the boom ...
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Inventor 李松云姜成武
Owner SANY HEAVY IND CO LTD (CN)