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: 2014-12-10
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 the embodiments of the present invention and the features in the embodiments can be combined with each other if there is no conflict. Hereinafter, the present invention will be described in detail with reference to the drawings and in conjunction with the embodiments.
[0027] Control method embodiment:
[0028] See figure 2 , The figure shows a preferred embodiment of the preload control method of the super lift device of the present invention. This embodiment is used to figure 1 The hoisting rope 2 applies pre-tightening force, and the following is combined figure 1 , This embodiment will be further explained.
[0029] As shown in the figure, the method includes the following steps: step S1 of applying a pre-tightening force, turning on the hoisting motor, and applying a pre-tightening force to the hoisting rope 3; pressure detecting step S2, detecting the hoisting motor or cylinder 4 of the super-lifting device Pre-tightening force calculation ste...
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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, and in particular to a preload control method, control device and control system of a super lift device. Background technique [0002] At present, with the rapid development of economic construction, cranes are also expanding in the direction of large tonnage. Large tonnage cranes are generally equipped with super-lifting devices on the boom to improve the lifting performance. The structure of the super lift device is generally as figure 1 As shown, the super-lifting arm 5, the hoisting device and the hydraulic cylinder 4 are included. Among them, the super boom 5 is hinged with the boom 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 drum 3, and the hoisting motor provides power to the drum 3. The hoisting rope 2 is connected to the piston rod 41 of the hydraulic cylinder 4 after passing around the...
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IPC IPC(8): B66D1/50
Inventor 李松云姜成武
Owner SANY HEAVY IND CO LTD (CN)