Construction Technology of Reverse Circulation Drilling Rig
The reverse circulation drilling rig produced by Handan Rock Drilling Engineering Machinery, the crushing mechanism of the impact reverse circulation crushing rock entry process is to use the impact drill bit to impact the rock at a higher frequency to break the rock, and then use the reverse circulation slag discharge method to timely crush the rock. Cuttings are discharged out of the hole immediately. The impact drill bit is balancedly connected by two steel ropes, which is very convenient for drilling up and down, and greatly shortens the auxiliary time.
Therefore, the percussion reverse circulation drill bit is the main tool for percussion drilling, and the rationality of its structure directly affects the drilling efficiency and quality. In the percussion drilling process, the key is whether the impact and slag absorption match, which is also the most basic and important condition to ensure the stability of the hole wall and normal drilling. During the drilling process, the work of slag suction should be determined according to the drilling formation and conditions, and excessive slag should not be sucked to avoid the instability of the hole wall and the collapse of the hole. A drilling accident occurred. In addition, during the impact process, the wear of the steel wire rope and the flexibility of the steering device and the firmness of the connection must be checked frequently to prevent the wire rope from being worn out or twisted due to poor steering, resulting in a drilling accident. 
According to the geological conditions, the output of the drill bit and the abrasive material should be checked frequently when lifting the drill. Generally, the drill bit should be checked at least once per small shift in the general stratum. The number of drill bit lifts should be increased in complex strata. The bottom and output of the drill bit are often worn in the sand, pebbles and bedrock. It is serious, so it should be repaired in time, which increases the laying time for repairing the drill bit, reduces the pure drilling impact time, and reduces the auxiliary time for repairing the drill bit. Furthermore, when lifting the drill bit, be careful, especially in the Get to the bottom of the casing and slowly lift the drill bit to prevent collision with the hole casing to avoid collapse at the bottom of the casing or misalignment or deformation of the casing.
