The anti-fall device for jacking cylinders in shipyard cranes adopts a spring ejector ball fixation method, which can not only lock the cylinder when the piston rod retracts to prevent the piston rod from falling, but also disengage the ejector beads when the piston rod extends, allowing the cylinder to jack up the tire. Hydraulic gantry crane. The jacking cylinder helps reduce tire wear of the tire-type hydraulic sevencrane shipyard gantry cranes, thereby reducing tire consumption costs; however, during the use of the equipment, piston rod falling accidents caused by internal leakage of the jacking cylinder occasionally occur, which affects the safety of terminal operations. and cost control.
To solve the above problems, the following solutions are adopted: First, modify the tire industrial shipyard gantry cranes for sale electrical control system program to automatically start the jacking oil pump when internal leakage occurs in the jacking oil cylinder; second, add a spring to the jacking oil cylinder, and when internal leakage occurs in the jacking oil cylinder, In case of failure, it provides upward pulling force to prevent the piston rod from falling.
Judging from the actual application effect: Option 1 is only applicable to the situation where a slight internal leakage failure occurs in the jacking cylinder. In the case of a serious internal leakage failure in the jacking cylinder, the piston rod falling accident is still unavoidable; Option 2 cannot determine the jacking The falling force after internal leakage failure of the oil cylinder makes it difficult to select the spring model. In view of the poor application effect of the above solution, the jacking cylinder of the tire-type hydraulic gantry crane was modified and an anti-fall device was installed on the jacking cylinder, thereby effectively preventing the piston rod from falling due to internal leakage failure in the jacking cylinder.
When the tire-type hydraulic gantry crane relies on tires to move straight, the jacking cylinder is in the initial state: the piston rod retracts into the jacking cylinder and the support base is off the ground. The steel ball is located below the lower slope of the anti-fall retaining ring. The top of the arc surface of the steel ball is in contact with the lower slope of the anti-fall ring. The horizontal overlap distance between the vertical surfaces in the middle part of the anti-fall blocking ring is 5~20mm, and the vertical distance between the steel ball anti-fall support point and the lower slope of the anti-fall blocking ring is 0~10mm. Once internal leakage occurs in the jacking cylinder, the anti-fall blocking ring can effectively prevent the piston rod from falling, ensuring the normal operation of the tire-type hydraulic made in china shipyard gantry cranes equipment.
When the tire crane turns, the jacking cylinder enters the working state: the piston rod extends out of the jacking cylinder under the action of the hydraulic system, the jacking cylinder rises, the steel ball is located above the anti-fall retaining ring, and the steering mechanism drives the tire away from the The support base is on the ground to prepare for the tire steering operation. After the driving system of the steering mechanism completes the tire steering operation, the hydraulic system decompresses, the piston rod retracts into the jacking cylinder, the support base lifts off the ground, and the tire touches the ground. When the anti-fall ring reaches the end of the jacking cylinder block, the piston rod stops rising and the jacking cylinder returns to its initial state.
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