Proposal of the 2nd and 1st Annual Academic Exchange of the Chinese Society of Navigation, the proposal for the hydraulic control system of the permanent ship lock hoist. Puguangfeng Changjiangxia Navigation Administration Yichang 4431331 temporary ship lock hydraulic hoist characteristics 1.1 temporary ship lock adopts hydraulic push-type herringbone Advantages and Disadvantages of Hoist The hydraulic push-pull herringbone hoist is relatively stable and can achieve multi-level safety protection. With the electro-hydraulic proportional variable pump, it can flexibly realize a variety of complex output characteristics such as herringbone variable speed operation. However, compared with the fan-shaped gear linkage mechanism herringbone gate hoist used in the ship lock of No. 2 Gezhouba No. 1, the hydraulic direct push type herringbone has poor holding ability, and the switch has a large inertia and is difficult to locate. Monitoring should be strengthened during operation. Especially in the period of opening the valve after the end of the herringbone gate, it is necessary to check whether the stroke switch is normal or not, and whether the flip-flop phenomenon appears.
1.2 Temporary ship lock hydraulic system The advantages and disadvantages of using a large number of plug-in valves are made up of a plug-in valve. The insert is composed of the valve plug sleeve spring and the seal. The control cover is equipped with corresponding pilot control level components according to the different functions of the cartridge valve; the passage block is the main oil passage and the control oil passage is good, and the main spool is not easy. Jam resistance; small volume per unit flow; rod cavity without rod cavity can change diameter, easy to adjust and control pressure; simple and compact structure, easy to integrate, greatly reduce pipe joints and leakage oil vibration noise caused by pipeline Fault, easy maintenance, etc.
The plug-in valve is more suitable for large-flow hydraulic systems, but at the same time, it is difficult to judge and handle the obstacles. Due to the large number of plug-in valves, the number of hydraulic system components increases accordingly, so the leakage of the system leaks increases, resulting in The rigidity of the herringbone gate is not enough, and the holding power is poor. At the same time, the system is more sensitive to oil pollution, and the control oil circuit is prone to blockage.
1.3 Temporary ship lock herringbone hydraulic hoist has drift phenomenon The working principle of the multi-stage load balance oil circuit of the herringbone cylinder is moved to close. At this time, the lower gate of the herringbone gate has a rod cavity and an overflow of 3 The flow valve is connected, and the oil in the stalk cavity of the lower gate of the miter gate is flowed back to the oil tank by the fixed back pressure under the push of the piston, and the rodless cavity is replenished from the fuel tank by the fuel supply pipe with the check valve; Before the arrival of the upper gate level signal, the upper gate, 17 is electrified, and the herringbone gate is moved in the direction of opening the door under the action of the super-irrigating reverse head water pressure. At this time, the upper gate of the upper gate has no rod cavity and tone. The relief valve with a value of 0.3 is connected, and the oil in the rodless chamber of the upper gate of the upper gate is supported by the piston with a fixed back pressure flow tank, and the rod chamber is filled by a fuel supply pipe with a check valve. Fill the oil from the fuel tank.
At the same time, the front door of the herringbone gate is closed at the same time as the drain valve. At the top of the gate, the Ding 6 is electrified, and the herringbone gate is moved to the closing direction under the action of the draining water head to the closing direction. At this time, the upper gate of the herringbone gate cylinder The overflow valve with the stalk cavity and the set value is connected, and the oil in the rod cavity of the upper gate of the upper gate is flowed back to the oil tank with the fixed back pressure under the push of the piston, and the rodless cavity is brought by the belt. The fuel supply pipe of the check valve is replenished from the fuel tank; before the arrival of the lower gate level signal, the lower gate 017 is energized, and the herringbone gate is moved in the direction of opening the door under the action of the over-reverse reverse head water pressure. The rodless chamber of the word gate cylinder is connected to the overflow valve of the set value. The oil in the rodless chamber of the lower gate of the miter gate flows back to the tank with a fixed back pressure under the push of the piston, and there is a rod. The chamber is filled with oil from the fuel tank by a charge pipe with a check valve.
The cause of the drift of the herringbone gate is when the herringbone gate is closed and the water is drained. Ding 6 is electrified, and the rod cavity oil can flow back to the tank with a fixed back pressure. In theory, only the miter gate can move to the closing direction in the direction of closing the door under the action of the forward head, and will not open; 1 Fanggang moves, but in the actual application process, the herringbone door is often used under the action of external force, such as the wind and the wind, and the current herringbone door is moved to the door opening direction when the water is drained after the shutdown. The phenomenon of automatic control program interruption is the phenomenon of the flip-flop phenomenon.
The external and drifting external factors of the miter gate are affected by external forces, including the unstable current of the wind swell and the countercurrent head of the undercurrent to the front of the head.
These external forces are unstable, random, and cannot be overcome and avoided.
Due to the internal force, the holding force of the hydraulic cylinder of the herringbone gate hoist is too small or can not be held. The reason is as follows: 3 The hydraulic cylinder is mixed with a certain amount of air, and the air remaining in the oil pipe of the valve block when the hydraulic system is initially installed; the rod chamber and the rodless chamber of the hydraulic cylinder suck in the air; When handling the leakage oil failure, some valve blocks and tubing joints are disassembled, and some air will inevitably be mixed when reloading; some valve blocks are installed above the tank level, and the engine is not motivated for a long time, which may cause oil in the valve block. The liquid flows back to the tank and is sucked up. Because the air is compressible, under the action of a small external force, the piston rod of the herringbone cylinder will retreat and drift.
The internal leakage of the herringbone hydraulic hoist system and the external leakage piston and the inner wall of the cylinder bore and the normally closed manual ball valve on the B-shaped connecting tube with the rod cavity without the rod cavity will cause internal leakage; There are many multi-stage protection valve blocks, and the leakage path is increased, which increases the external leakage. The herringbone gate is subjected to the external force such as the unstable current of the wind swell and the reverse head of the undercurrent to the head, and transmits the force to the piston, which is then transmitted to the hydraulic oil in the cylinder, due to internal leakage of the hoist system and External leakage, a small part of the hydraulic oil in the cylinder will simmer between the rod chamber and the rodless tank, which will cause the piston rod to displace. After a period of time accumulation, the herringbone door drift phenomenon occurs.
In the electrical control, consider adding electrical protection measures. For example, you can increase the subroutine of collecting the cylinder encoder data to detect the drift of the flip-flop in the period after the end of the herringbone gate, and display the drift on the centralized control monitor. Degree, when the drift reaches a certain level, an alarm is issued, and when the drift amount reaches the limit level, corresponding electrical protection measures are taken.
2 Some suggestions for the design of the permanent ship lock hydraulic hoist through the two-year operation practice of the temporary ship lock, comprehensive analysis of the temporary ship lock equipment operation status, the permanent ship lock hydraulic hoist and system design should pay attention to the following aspects. 2.1 For the permanent ship lock Operating characteristics, focusing on safety and stability should minimize the hydraulic inertia of the hydraulic hoist system, because this directly affects the reliability and life of the stroke switch operation, and the travel switch is an important detection and control component of the ship lock operation.
Emphasis should be placed on increasing the rigidity and holding force of the hoist to overcome or reduce the drift of the herringbone and improve the safety and reliability of the operation of the gate.
In the electrical control, the drift-induced and unsafe factors are solved. When the drift amount reaches a certain level, the alarm is raised and the corresponding electrical protection measures are taken when the drift amount reaches the limit.
Important stop valve should be equipped with position detection. 2.2 Design and manufacture should consider the rapid operation failure judgment and emergency treatment. Temporary ship locks fail to distinguish the various pipelines and the various control parts to carry out the correct grade number, which is not conducive to rapid fault diagnosis. Permanent ship locks should be considered.
Add more pressure measuring points, assist judgment by more pressure values, and deal with faults.
It is expected that a troubleshooting expert system can be designed for rapid fault diagnosis and emergency handling.
2.3 Design and manufacture fully consider the convenience of maintenance and maintenance The design and manufacture of the hydraulic system should be concise and concise.
The manual pump of the manual emergency circuit is changed to the electric pump or the manual pump is reserved to add the electric pump to increase the flow, and is independent of, and controlled, for emergency operation, maintenance, commissioning, installation and jog operation.
Herringbone hydraulic system valves hydraulic system herringbone door locking hydraulic system should be isolated from each other, and can be operated independently during maintenance.
Add quick connectors and portable pump stations or micro power units.
Provide a detailed list of the model specifications of all seals in the hydraulic system and the locations in the system for the operation management unit to purchase and replace.
Equipped with necessary maintenance tools and testing instruments such as oil filter truck maintenance reserve tank oil-water separation device pipeline flushing device pollution degree detection instrument sensor.
2.4 Process should be improved to improve the optimization of pipeline design and installation force to ensure that the pipeline layout is neat and orderly.
To optimize the valve block arrangement, it is recommended to arrange the valve table to facilitate the handling of oil leakage and replacement of seals.
2.5 Other circumstances A list of spare parts is reasonably provided according to the characteristics of the operation of the permanent ship lock equipment.
The general contractor and the subcontractors should coordinate with each other to avoid the confusion of the electromagnet connection.
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