Problems in designing cutter suction dredger


1. The oil suction pipe and oil return pipe shall be inserted below the lower liquid level to prevent bubbles caused by suction and oil return splash. The distance between the pipe orifice and the box bottom and the box wall is generally not less than 3 times of the pipe diameter. The oil suction pipe can be installed for about 100 minutes μ M screen or wire gap filter, the installation position shall be convenient for loading, unloading and cleaning the filter. The outlet of the oil return pipe shall be cut into a 45 ° angle and face the tank wall to prevent the oil return from impacting the sediment at the bottom of the oil tank and facilitate heat dissipation.

2. The distance between the oil suction pipe and the oil return pipe of the cutter suction dredger shall be as far as possible, and a baffle shall be set between them to increase the liquid circulation mode, so as to increase the effects of heat dissipation, air separation and impurity precipitation. The diaphragm height is 2 / 3 ~ 3 / 4 of the liquid level.

3. In order to keep the oil clean, the oil tank should have a cover plate sealed around. The cover plate is equipped with an air filter. Oil filling and ventilation are usually done by air filters. In order to facilitate oil drainage and cleaning, the bottom of the oil tank shall have a slope, and an oil drain valve shall be set at a lower position. For the oil tank whose cover is not easy to open, a cleaning hole shall be set to facilitate cleaning the inside of the oil tank.
4. The bottom of the oil tank is more than 150mm above the ground, which is convenient for loading, unloading, oil drainage and heat dissipation. A lifting lug shall be set at the appropriate position of the oil tank, and a liquid level gauge shall be set to detect the liquid level.
5. Pay attention to the anti-corrosion treatment of the inner surface of the oil tank of the cutter suction dredger. Common methods are as follows:
① Phosphating after pickling. It is applicable to many media, but the oil tank cannot be too large due to the limitation of pickling and phosphating tank.
② Thermal spraying of alumina after sand blasting. Suitable for other media except water glycol.
③ Plastic spraying after sand blasting. Suitable for many media. However, due to the limitation of drying equipment, the oil tank cannot be too large.