Improvement of safety protection for hydraulic stations
Release time:
2024-05-10
The optimization of the electronic control protection program for the hydraulic station avoids damage caused by poor or rapid oil return, ensures the safe operation of the hoist, and strengthens equipment management to ensure that the hydraulic station always maintains good working condition and performance.
The hydraulic system is the key supporting equipment of the hoist and the fundamental guarantee for the safe operation of the mine hoist. The operational performance and safety protection of its hydraulic station directly affect equipment and personal safety; Therefore, the improvement design of electrical protection for the hydraulic station of the hoist is urgent.
At present, most of the hydraulic stations equipped with elevators in China have a secondary braking function, but there is little protection function for them, which poses a hidden danger to safety production. Based on on-site usage experience, the electronic control system needs to improve secondary braking protection.
(1) The usual implementation method for increasing speed feedback protection in secondary braking is to disconnect the safety circuit and maintain the oil pressure at the primary braking pressure until the delay time ends. During on-site safety braking, due to improper pressure adjustment, blockage of the relief valve, and other reasons, the secondary braking pressure may be too high or overload may increase. If the above abnormal working conditions occur during the secondary braking process of lifting the heavy load of the hoist, due to insufficient braking torque, the hoist stops, causing the heavy load side to run downwards. This type of working condition is very dangerous, and if it occurs at the wellhead position, the lifting container on the light load side is prone to over coiling accidents. In response to the causes of the hydraulic station faults mentioned above, the electronic control system needs to add a second level brake protection program, which can achieve full braking when either the speed of the hoist drops to zero or the delay time ends. The brake oil pressure does not need to be maintained until the delay time ends.
(2) Add oil pressure monitoring function to monitor the secondary brake oil pressure in real-time through a pressure transmitter. When the oil pressure is too high, perform full braking; When the oil pressure is too low, an alarm signal is issued to remind maintenance personnel to find the cause of the fault.
(3) Improving the secondary brake release program. Currently, most electronic control systems confirm the release of the secondary brake by both the winch operating direction signal and the brake position release signal, as shown in Figure 4. If the main control system exceeds the parking position, the direction signal is released and the secondary braking is restored; If the secondary brake oil pressure is too high or overloaded during safe braking, it is easy to cause over coiling accidents.
The optimization of the electronic control protection program for the hydraulic station avoids damage caused by poor or rapid oil return, ensures the safe operation of the hoist, and strengthens equipment management to ensure that the hydraulic station always maintains good working condition and performance.
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