Risk prediction method for accident gate closure of hydraulic ship lift

Abstract

The invention relates to a risk predication method for accident gate closure of a hydraulic ship lift. The risk predication method is characterized in that the mechanical problem of stress of a winding drum is converted into a hydraulics problem, a pressurized pipeline flow calculation formula is applied, the variation of the water body of a vertical shaft is calculated by virtue of an integration means and compared with a critical value, and thus risk predication on an accident gate closure working condition of the hydraulic ship lift is carried out. The risk predication method provided by the invention has the advantages that the risk predication can be carried out on an extreme accident working condition of the accident gate closure of a brake of the hydraulic ship lift in advance, preventive measures are taken, and the risk is avoided. Prototype observation tests verify that the risk predication method provided by the invention is reliable in result, the operation safety of the ship lift can be effectively guaranteed, and loss of life and property is avoided.

Description

technical field [0001] The invention belongs to the field of navigable hydraulics, and relates to a risk prediction method for accidental working conditions of a hydraulic ship lift on a lock. Background technique [0002] The hydraulic ship lift uses water energy as the lifting power, fills and discharges water to the shaft through the water delivery system, drives the counterweight to lift up and down, and drives the ship's compartment to run through the steering of the reel, and can automatically adjust the submerged depth of the counterweight to adapt to the entry and exit of the compartment The weight change caused by water is a new type of ship lift independently developed by our country. The general layout is shown in figure 1 . Hydraulic ship lifts generally use "2 auxiliary valves + 1 main valve" in parallel to form a water delivery valve system, see image 3 . [0003] Multiple groups of drums are installed on the top of the hydraulic ship lift, and a closed sys...

AI Technical Summary

Problems solved by technology

[0005] (1) Risk analysis of the accidental lock-up of the shaft water-filled ship compartment: when the water delivery system fills the shaft with water, if the brake is accidentally applied, the ship compartment and the counterweight will stop running immediately, the water level of the shaft will continue to rise, and the buoyancy of the counterweight will increase. Unbalanced forces on both sides of the drum: 1) If the torque acting on the drum due to the side gravity of the ship compartment is less than the design braking torque of the brake, the braking force can meet the braking requirements in any case, but there may be balance weight floating, wire rope 2) If the torque acting on the reel due to the side gravity of the ship is greater than the design braking torque of the brake, the braking force of the reel is the control condition, and under certain operating conditions, the braking force of the ship will be insufficient. car sliding phenomenon

[0006] (2) Risk analysis of the accidental lock-up of the vertical shaft discharge ship compartment: when the vertical shaft discharges water downstream through the water delivery system, if the brake is accidentally locked, the ship compartment and the counterweight will stop running immediately, the water level of the shaft will continue to drop, and the buoyancy of the counterweight will decrease. If the force on both sides of the reel is unbalanced, the braking force may be insufficient and the boat compartment may slide upwards

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