Control method for pulling arm bushing out of crane single cylinder bolt system

Abstract

The invention discloses a control method for pulling an arm bushing out of a crane single cylinder bolt system. The control method comprises the following steps of (11) presetting the release guard time of a cylinder bolt; (12) releasing the cylinder bolt, and recording the actual release time of the cylinder bolt; (13) judging whether the actual release time of the cylinder bolt achieves the preset release guard time, if so, going to step (14), if not, going on step (13); and (14) giving response to an arm pin pulling order input from the external world so as to pull the arm pin out. According to the control method, the premise that the arm pin pulling order is carried out is that the cylinder bolt is released for enough long time, namely, under the premise that the cylinder bolt is completely released, the arm pin is pulled, therefore, the phenomenon that the arm pin and the cylinder bolt are locked as an operator inputs the arm pin pulling order too fast is avoided, and the crane is ensured to work normally.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a control method for pulling out arm pins in a single-cylinder pinning system of a crane. Background technique [0002] The single-cylinder bolt system is a device built into the telescopic arm of the crane to assist the expansion and contraction of the telescopic cylinder. It mainly includes cylinder pins, arm pins, arm pin bolts, dovetail grooves, cylinder pin cylinders, dovetail groove cylinders and other components. [0003] can refer to figure 1 understand, figure 1 It is a structural schematic diagram of a typical single-cylinder bolt-type crane telescopic arm mechanism. [0004] The tail of the basic arm of the crane is fixed with a telescopic oil cylinder 13, and the head of the telescopic oil cylinder 13 is radially provided with a cylinder pin 131, and the tail of each telescopic arm is provided with a cylinder pin socket 14, and the cylinder pin 131 can...

AI Technical Summary

Problems solved by technology

If the rocker switch is switched from the upper position to the lower position too quickly, resulting in a short dwell time in the middle position, that is, the release time of the cylinder pin 131 is too short, and the hydraulic oil in the cylinder pin cylinder 136 has not completely returned to the oil through the core tube 135, and it is cut off. The passage between the cylinder pin cylinder 136 and the fuel tank T, the core tube 135 turns to communicate with the pump P and the dovetail groove cylinder 132, and performs the action of pulling down the dovetail groove 133. At this time, the cylinder pin 131 is not completely released, and the interlocking mechanism of the cylinder arm pin 11 Under the action, the dovetail groove 133 could not be pulled down into place, resulting in a state where both the cylinder pin 131 and the arm pin 11 were locked, resulting in failure of the crane to work normally

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