The container reach stacker is the main equipment for lifting operations in the port, and the failure of the spreader while the machine is in operation is inevitable.
Today, based on how the Reach Stacker Spreader works, We will talk about troubleshooting methods for common reach stacker problems.
How it works
The operating principle of the front stacker is shown in fig. 1. The solid line arrows in the figure represent the electrical signal direction, and the dotted line arrows represent the hydraulic signal direction. When the electrical signal and hydraulic signal can be transmitted normally, the spreader can perform the actions of each part correctly (as shown by the straight line in the figure).
It can be seen from figure 1 that after using the hydraulic handle to send an action signal to the spreader controller, if the spreader is not working properly, start with the spreader solenoid valve to determine if it is an electrical fault. or hydraulic failure. And it may be known that the cause of the failure must be found from the execution or control part.Troubleshooting methods (1) Spreader does not move
First, pay attention to the emergency stop button. Sometimes the operator inadvertently touches the emergency stop button on the front stacker and the spreader does not move.
Secondly, check if power is being supplied to the solenoid valve. For reachstackers equipped with ELME spreaders, you can determine if the solenoid valve is energized by looking to see if the indicator light on the solenoid valve is lit. If all control solenoid valves are not energized, the main fuse for the spreader control circuit may be blown, and you should check to see if the main fuse is blown. If it is impossible to judge whether the fuse is capable of breaking with the naked eye, it must be checked with a multimeter.
Finally, check it piece by piece with a multimeter. If only the solenoid valve of a certain action is not energized, the hydraulic handle button that controls the action or control line may be faulty. Use a multimeter to check the continuity of the line segment by segment, and it is easy to find the fault location.(2) Spreader indicator light defective
Typically, there are three ways a spreader indicator light will fail.
If the spreader indicator does not light, the bulb may be damaged. When troubleshooting, you should first check if the light bulb is damaged. If the spreader position indicator flashes, the spreader position sensor may be defective, usually the distance between the position sensors is not adjusted properly or the sensor is damaged. If the spreader indicator flashes red and green alternately, it may be because the twistlock cylinder is not in place, causing the piston rod of the twistlock cylinder to reciprocate when extending and retracting, causing red and green flashing alternately flowers. the lights.(3) Spreader does not turn or runs too slowly
The most common reason for a spreader not turning without action is that the key on the output shaft of the spreader's swivel motor has been sheared, causing the slewing motor to "lose rotation", resulting in the spreader not working. If only one spreader rotation motor is running, this will cause the spreader to rotate slowly.(4) Telescopic chain broken
The reachstacker can lift 20ft and 40ft containers. When switching from lifting a 20ft container to lifting a 40ft container, the horizontal telescopic boom must be extended, and the extending action is driven by the telescopic chain. If the telescopic chain tension is not properly adjusted, the telescopic chain may break. The telescopic chain design is shown infigure.
When replacing the chain, the following steps must be followed: first, remove the oil pipe and wire in the guide of the horizontal telescopic boom; cut the appropriate length of the chain and connect it; Finally, adjust the chain tension, loosen 2-3 threads after tightening the chain. When replacing the chain, do not stack the chains together, otherwise the chain may become lodged in the telescopic boom tube and become deformed, resulting in hidden failures.