Port equipment_ Application and maintenance of hydraulic rolling on / off connecting bridge for passenger cars
Port equipment_ Application and maintenance of hydraulic rolling on / off connecting bridge for passenger cars
(1) Application status of hydraulic passenger steam ro Ro Connecting Bridge
The key to the use of hydraulic passenger steam ro Ro Connecting Bridge is to be simple, safe and reliable. During work, the height of the bridge deck shall be adjusted according to the tide level to meet the requirements of getting on and off. The lifting of the bridge deck is driven by the hydraulic cylinder. Although the synchronization device is set in the hydraulic system, the hydraulic cylinder cannot be fully synchronized, so it needs to be adjusted at any time. Generally, there are several horizontal lines on the pier and abutment of the connecting bridge. People control the bridge deck to reach the same plane according to these signs during indoor operation. Because it is inconvenient to observe indoors, sometimes a person standing on the bridge commands the indoor operator to operate, which is also very intuitive. Later, a sensor is set on the bridge to transmit the signal to the room, observe the position of the bridge deck on the console, and then adjust it. However, if you want to control the appropriate position of the bridge deck and ship door panel, people can observe it most clearly and intuitively when standing on the bridge deck. Therefore, the current method is that the operator stands on the bridge and holds the remote controller for remote control.
The safety of hydraulic Passenger Automobile Ro Ro Connecting Bridge is particularly important in use. When vehicles get on and off the bridge, once the bridge deck cannot be locked, the consequences will be unimaginable. Initially, the hydraulic cylinder (bridge deck) was locked in a certain position only by the hydraulic lock (hydraulic control check valve) in the hydraulic system. Due to the short operation time of the connecting bridge (about one hour), the hydraulic lock locking is relatively reliable when the internal and external leakage of the hydraulic cylinder meets the requirements. However, in order to ensure safety, a set of mechanical locking device is added to play the role of double insurance. Initially, the high-strength ring chain is hung on the gantry. After the bridge body is in place, the pin is inserted manually to fix the bridge body. Later, the position hole is set on the pier. After the bridge body is in place, the pin is inserted manually for positioning. Now it is changed to hydraulic or electric pin. After the position is preset by PLC technology, it will automatically find the hole and locate. When restarting the bridge, the pin must be pulled out automatically to form a set of locking protection system, so as to make the work of the bridge more safe and reliable.
(2) Maintenance of hydraulic passenger steam ro Ro Connecting Bridge
The hydraulic passenger and steam ro Ro Connecting Bridge is also a large equipment for the port. Its management should be strengthened, special personnel should be assigned to operate, and daily maintenance and regular maintenance should be insisted to ensure the normal operation of the equipment and improve its utilization rate.
The bridge body, gantry and other metal structural parts of the connecting bridge shall be derusted and painted regularly, and the weld shall be inspected for cracking and treated in time. The maintenance of the hydraulic system of the connecting bridge is particularly important and should be paid great attention to.
① Hydraulic oil the working medium of the hydraulic system is hydraulic oil. Appropriate hydraulic oil shall be selected to meet the working requirements of hydraulic components and specific ambient temperature requirements. For places with large temperature difference in four seasons, it is best to choose thickened hydraulic oil or hydraulic oil with high viscosity temperature index.
More than 70% of the faults of the hydraulic system are caused by the pollution of the hydraulic oil, so the purchase, transportation, storage and injection of the hydraulic oil must be strictly controlled to avoid the intrusion of foreign matters. When filling oil, it must be filtered strictly, the oil tank must be cleaned in time, and the filter element must be replaced or cleaned. It should be noted that hydraulic oils of different manufacturers and brands cannot be mixed.
② After the hydraulic system of pipeline system is used for a period of time, due to impact and vibration, it will cause looseness of pipeline joints and connecting parts, wear of mating parts, etc., resulting in oil leakage. The proportion of pipeline joint oil leakage in oil leakage accidents can reach 30% ~ 40%, so regularly check whether the joint is loose, tighten and replace the sealing ring in time. Outdoor pipelines shall be derusted and painted regularly, and aging hoses shall be replaced.
③ Hydraulic valve is a more precise hydraulic component. Due to the wear in the working process, the clearance is too large, the fatigue damage of spring and other components, and the invasion of hydraulic oil and dirt will cause the action failure of hydraulic valve, make the system work abnormally or cause accidents. Therefore, the necessary components must be cleaned, maintained or replaced regularly.
④ Hydraulic cylinder and hydraulic control check valve hydraulic cylinder and hydraulic control check valve are the key components in the hydraulic system of hydraulic passenger steam ro Ro Connecting Bridge. When the hydraulic system works, the hydraulic cylinder bears the gravity of the empty bridge (no vehicle). After the bridge body is positioned, the hydraulic cylinder is locked by the hydraulic control check valve and bears the total gravity of the bridge body and the vehicle.
Locking failure, external leakage at the piston rod of the hydraulic cylinder and leakage between the piston and the inner diameter of the cylinder barrel are the main reasons for the sinking of the hydraulic cylinder. Selecting the appropriate model and specification of hydraulic control check valve has an obvious effect on reducing the working pressure of the system when the bridge body drops. If any abnormality is found in the hydraulic control check valve during operation, it shall be handled in time to ensure the reliable locking of the bridge body.
The external leakage between the piston rod and the locating sleeve of the hydraulic cylinder and the internal leakage between the piston and the inner diameter of the cylinder barrel must be strictly controlled. The rough judgment of internal leakage is calculated based on the settlement of hydraulic cylinder, and the allowable range is 0.2mm/min.
The external leakage and internal leakage of hydraulic cylinder are not only determined by the manufacturing accuracy of components, but also by the dimensional accuracy of sealing components and the quality of materials. The price of domestic seals is low, but the reliability is poor. Generally, they should be replaced in 1 ~ 2 years; The price of imported seals is high, and the service life is generally 3 ~ 5 years. There are many kinds and quantities of seals used in the whole system, and the damage and aging of seals are inevitable. Timely and regular replacement is particularly important.
