Pay attention to the following issues when drilling with pneumatic water well drilling rigs:

        (1) Blow hole

        The experiment indicates that when the gas drill is drilling normally, check the discharge of rock dust and cuttings at the orifice and the footage. There is no need to lift the drill when the powder discharge and footage are normal. If only the footage is entered but the powder discharge is abnormal, the drilling tool should be lifted once after a certain footage has been drilled (the impactor is not working at this time) to generate a large upward and return wind speed. After the rock dust and cuttings are blown out of the orifice , And then put the drill tool to the bottom of the hole to continue drilling. This kind of lifting drill tool can blow out the larger drop blocks out of the orifice, and can blow out the drop blocks with a mass of 510g. In short, keep the bottom of the hole clean.

        (2) Sudden changes in wind pressure

        Pneumatic water well drilling rigs should always observe the pressure changes of the wind pressure gauge when drilling. When the wind pressure suddenly increases, it is difficult to lift the drilling tool at the same time. It may be that the upper part of the down-the-hole hammer forms a mud or buried drill. If the upper infarct can be blown away by the rated working pressure of the air compressor while the drilling tool is stringed, the drilling can be continued. If it is invalid, water can be injected from the orifice to dilute the mud and blow out the orifice, or a certain foaming agent can be injected from the drill pipe to dilute and sweep away. When connecting a single drill pipe, the active drill pipe will start to supply air after it is connected, and the bottom of the hole will be blown clean. You can continue drilling. Do not lower the down-the-hole hammer to the bottom of the hole before supplying air. In this way, it is easy to be blocked by cuttings in the down-the-hole hammer.

        (3) After drilling a single drill pipe, do not rush to stop the gas. After 1-2 minutes of blowing the hole, lift the active drill pipe to the front to stop the gas supply.

        (4) The DTH hammer should always be oiled smoothly when working, and oil should be filled in time when connecting the drill pipe to prevent the loss of piston and cylinder liner.