The multi-functional pile driver (down-the-hole drill) mainly consists of a drill rod, ball-tooth drill bit, and an impactor. It is characterized by its simple structure, ease of use, and light weight, and is primarily used for drilling operations, commonly seen in stone mine extraction. The down-the-hole drill, in special terrain and geological conditions, is prone to issues like drill rod socket fracture, and drill rod jamming or running, which not only damages components and reduces efficiency but also leads to wastage in maintenance and replacement. To overcome these problems, some common issues in the operation of down-the-hole drills have been summarized. By combining these with practical experience, efficiency can be improved and costs reduced.

1. The drill rod socket of the down-the-hole drill can be easily damaged due to design reasons, deformation caused during drilling in the drill rod's inner hole, a large gap between the socket and the drill rod, poor socket contact, and excessive localized pressure, leading to wear of the socket and plug ears. Solution: In assembly, change the direct assembly of the socket and drill rod to an indirect one, standardize the grinding of the plug ears, increase the contact area, distribute the force evenly, and reduce wear.

2. The drilling tools of the down-the-hole drill, being the main working mechanism and a critical component, often face faults like broken rotary reducer joints, drill rod plug sockets, and twisted rotary motor shafts due to complex geology. Solution: Preserve the main body of the joint and replace the front part with a key. Increasing the key's length can enhance its load-bearing capacity. If the socket is damaged, it can be re-machined, reduce the angle of the rotation groove, and undergo heat treatment. The improved plug socket will extend its service life.

3. Once the drill rod of the down-the-hole drill is damaged, it usually has to be scrapped, which is very costly. However, it can be repaired by cutting off the damaged plug socket, machining the improved plug socket to match the drill rod size, and then embedding, welding, and grinding it. This allows the drill rod to be reused, significantly reducing costs.

4. The running and jamming problems of the down-the-hole drill are serious issues. Continuing to drill after these problems occur can cause the drill rod to bend, leading to misdrilling and severe damage to the drill itself. To solve the problem of running drills, first understand the working principle of the down-the-hole drill. Installing a bit support locator at the front end of the down-the-hole drill is effective. As for jamming, embed carbide blocks on the conical surface of the connecting rod between the impactor and the bit rod, distributed in a staggered manner. During the operation of the drilling tools, rely on the lifting force and rotational torque of the drilling tools to grind the stones, reducing the wear of the machine by debris.