Product Name: HZ-15 Type: Concrete Drilling Core Machine One, HZ-15 Type: Concrete Drilling Core Machine (Hereinafter referred to as the rig) New construction machinery for mechanical drilling of concrete. It is easy to operate, lightweight and flexible, with accurate drilling and sampling dimensions, smooth surface after drilling, and no accidental damage to the drilled material. It is an ideal construction machine. Two, HZ-15 Type: Concrete Drilling Core Machine Instructions (One) Preparation before use 1. To ensure safe and normal work, read the instruction manual first before using the equipment. Familiarize yourself with the structure and operation of the rig. 2. Clean all parts of the rig thoroughly. Add 20# mechanical oil (GB443-64) to lubricate the column rack part. 3. First drill a hole ∮19×50 mm, move the rig to the work site, adjust the support screw, and level it using a spirit level. At this point, the two rollers should be off the ground. Then insert and tighten the expansion bolt into the ∮19×50 mm hole. 4. After the rig is fixed, connect the faucet to the water source, turn on the water source switch, and check if water flows out. If it does, it is working properly. 5. Install the drill bit according to the required size for punching. 6. Turn on the power supply, switch on the electrical switch, run for a few minutes, and test the feed handle to ensure it is flexible and reliable. If everything works smoothly, proceed with the operation. (2) Precautions during use 1. When drilling, the resistance should be low, and the cutting process should be stable. The feed speed during drilling should be around 4–5 m/min. As the drilling nears completion, slight vibration may occur due to changes in cutting force. At this time, reduce the feed rate appropriately. Once the cutting is complete, quickly lift the drill until the cutting edge is released, then turn off the machine and cut off the water supply. 2. Ensure adequate water cooling throughout the entire drilling process. If the water flow is insufficient, stop the drill and inspect. However, when the drilling is completed, water flowing into the lower layer without overflowing is normal. 3. When the drill bit is being lifted rapidly, do not stop the machine. Instead, wait until the drill bit is just off the work surface, then stop the spindle rotation and raise the drill bit carefully. 4. If the drill bit becomes stuck, quickly lift it for a moment, then slowly reinsert it. Avoid forcing the drill bit, which could cause breakage. 5. If the motor temperature exceeds 70°C during drilling, temporarily stop the machine and allow it to cool before continuing. 6. Turn the switch knob and move the operation handle forward to let the drill bit gently touch the concrete surface. Once the blade enters the groove, apply pressure and begin drilling. 7. If the drill bit cannot penetrate during the process, and the diamond part of the bit is not fully exposed, use a strong abrasive material (such as refractory brick or grinding wheel) to roughen the surface. This will allow the bit to start drilling effectively. Comcn Electronics Limited , https://www.comencnspeaker.com