1. Introduction of cemented carbide drill bits for coal and rock There are complete varieties of cemented carbide drill bits for coal and rock. The drill bit body adopts various production and processing processes such as precision casting, precision forging and medium carbon alloy steel cutting to adapt to the needs of different drill bit types and different drilling operating conditions. It is widely used in drilling and enlarging operations in soft rocks such as coal mines and gypsum mines.

II. Instructions for use

1. When working in different rock formations, select different types of drill bits, axial pressure and rotation speed according to the softness and hardness of the lithology. 2. When drilling, the drilling rig must follow the principle of matching the three elements of drilling (wind pressure, axial pressure, and rotational speed) with the parameters recommended by the drill bit sample.

3. Before the drill bit is run into the well, please check all parts of the appearance and verify whether the threaded end face of the drill bit is consistent with the factory number on the drill bit packaging box and certificate; whether there is a Xinrui trademark mark affixed to the surface of the drill bit to ensure that Prevent counterfeiting.

4. The drill bit must be stored reasonably on the drilling rig to prevent dust and other debris from entering the drill bit. 5. When replacing the drill bit, make sure there is no dust inside the drill tool, the air outlet is unobstructed, the threads are oiled, and the drill bit can be connected using lifting and rotation methods before use.

6. Before replacing a new drill bit, carefully check whether the threads and teeth are intact.

7. When drilling a new drill bit, run it at low axial pressure and low speed for 20-30 minutes, and then gradually increase the axial pressure to normal use. 8. When opening a new hole with a new drill bit, pay attention to clearing away debris (rocks, scrap metal, etc.) around the hole. While rotating, ventilate slowly and close to the surface to prevent drilling and impact damage to the drill bit. 9. When working in soft rock formations, when replacing the drill bit midway, strictly check whether the back of the old drill bit's teeth and the alloy teeth on the cone have fallen off to the bottom of the hole. If there is any residue of the old drill bit in the hole, it is strictly prohibited to put it in the original hole. Use a new drill bit.

10. When the drilling rig is shut down, the drilling tool cannot be parked in a hole with water to prevent rock slag and water from flowing back, entering the bearing and damaging the drill bit. 11. When working in rock cracks or rock cracks caused by blasting or in goaf areas, reduce the axial pressure and rotation speed to prevent teeth from breaking.

12. When the drilling tool is in the hole, it is strictly prohibited to reverse it to prevent the drill bit from falling into the well. 13. When the drill bit is in the hole and the air compressor suddenly stops working, rock slag can easily enter the drill bit. Therefore, long-term rotation is strictly prohibited, which will cause bearing wear, repeated rock slag crushing (or drill stuck), and accelerated drill bit wear. 14. During normal drilling operations, there should be no serious air leakage in the main air duct of the air compressor to ensure sufficient air volume and air pressure and extend the service life of the drill bit.

15. The rod stabilizer should be replaced regularly to ensure the stability of the drill rod and the normal operation of the drill bit.

16. It is strictly prohibited to use bent drill rods to avoid uneven stress on the three palms of the drill bit and accelerate damage to the drill bit.

17. Drill bits must be stored in a moisture-proof and ventilated place. During transportation, it is strictly forbidden to knock the gears and threaded buckles.