Air-driven facilities in the main unloader of larger mines

At the first start-up, turn on the manual switch and supply air to the air reservoir via an external air supply (2 vehicles docking or using an air pump) to bring it to the rated pressure. The solenoid valve is opened and the gas in the air reservoir enters the air starter through the relay valve. The resulting pressure difference causes the control valve to open. At the same time, the diesel enters the air starter, which is blown away by the air to atomize and act as a lubricant. The high-pressure air drive gear is extended to mesh with the diesel flywheel, and the impeller of the starter is driven at a high speed to rotate the flywheel to start the engine. After the engine works, the air compressor is driven to work, and the compressed air is supplied to the air reservoir via the condenser, the liquid storage tank, and the one-way valve.

Structure and Arrangement of the Air-Starting Device The overall arrangement of the air-starting device of the air-starting device follows the principle of high-low flow of air flow to reduce the resistance to air flow. The air starter is mounted on the engine's original electric starter. The air reservoir is arranged in the anti-twist pipe of the frame, and the relay valve, the electromagnetic valve, the liquid storage tank, the air distribution block and the like are fixed on the inner wall of the frame with a bracket. The condenser is spirally coiled with 5.8m long copper tube. The joints are clip-on and fixed on the subframe with brackets.

Main parts structure (1) Air reservoir According to the overall design concept of the 170t mining dump truck, the air reservoir needs to be placed in a cylindrical torsion resistant pipe with a length of 2060 mm and a diameter of 638 mm. In order to use space as much as possible, the air reservoir is in the form of a welded head and a cylindrical barrel. The head of the air reservoir is selected according to the JB/T4746-2002 standard for the elliptical head of the steel pressure vessel. The inner diameter of the head is 606 mm. After calculation, the volume of the air reservoir is 570L.

The length of the air line from the air tank to the air starter is 3.4m, and the maximum flow rate of the air starter is 590L/s. According to design requirements, the flow rate of the compressed air in the pipe is 10m/s, and the time to reach the air starter is 0.34. s, the air flow rate in the air reservoir is 570/0.34=1676L/s, which can ensure the start of the air starter. The design capacity of the air reservoir can meet the requirements for use.

Four metal slots are welded on the inside of the torsion-resistant pipe. The metal slot is filled with a liner and the liner is above the metal slot. During installation, lubricate the liner and push the air reservoir. In order to prevent the air reservoir from oscillating in the axial direction during use, weld 4 nuts on the end face of the head and screw in the bolts to fix the air reservoir.

(2) Liquid storage tank In order to ensure the smooth flow of compressed air and to protect electronic equipment, the condenser water must be discharged. The best way is to add a drying cylinder between the condenser and the air reservoir. Since the capacity of the air reservoir is 570L, the displacement of the air compressor is 57.8m3/h. If such a drying cylinder is provided, it is bulky and costly, and the small drying cylinder will bring greater resistance to the flow of the compressed air. In order to solve this problem, a liquid storage tank is used instead of the drying cylinder, and the condensed water is discharged through the liquid storage tank drain valve. Although compressed air still has a small amount of moisture, it can be discharged through the air reservoir drain valve after entering the air reservoir, which can meet the requirements of use. Reservoir structure.

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