HF-3 Type Indoor Rock and Concrete Core Drilling Machine
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Description
Product Introduction
The HF‑3 rock core drilling machine (hereinafter referred to as the “drilling machine”) is a new type of construction equipment designed for mechanically drilling concrete. It is easy to operate, lightweight and highly maneuverable, delivering precise hole diameters and sample dimensions, with smooth bore walls and minimal risk of damage to the extracted material—making it an ideal choice for construction applications. Powered by a series‑wound motor and equipped with synthetic diamond‑coated thin‑wall drill bits, this machine is primarily used in concrete structures such as buildings, highways, airports, port terminals, and dams, offering a modern series of core‑drilling solutions. As a result, it eliminates the outdated practice of pre‑drilling holes in precast panels or manually chiseling holes after construction, while also providing an excellent solution for core sampling in research settings.
Technical specifications:
| Parameter Category | Parameter content |
| Maximum core diameter for drilling | Φ50–150 mm (various drill bit specifications) |
| Maximum core drilling depth | 350mm |
| Drilling direction | Vertically downward |
| Feed method | Manual |
| Spindle speed | 350/700 |
| Drill bit type | Synthetic diamond thin-walled drill bit |
| Matching motor | AC motor |
| Power | 3000W |
| Voltage | 380V (220V optional for concrete) |
| External dimensions (length × width × height) | 80×70×160 centimeters |
| Weight | 220kg |
Main Structural Description
The core drilling machine features a vertical drilling orientation with the drill bit extending vertically downward, and it comprises an electric motor, gearbox, drill bit, column, base, and lifting mechanism.
The structure of the drilling rig is shown in the figure: a single-phase series‑excited motor is mounted on a reduction gearbox, which in turn is fixed to the lifting mechanism. This arrangement enables the gearbox to drive the drill bit at the lower end of its spindle to move vertically, thereby accomplishing drilling or core sampling.
A rack is mounted on the column, enabling the gearbox to move vertically along the column; this movement is achieved by manually rotating the feed handle.
Preparation before use:
1. To ensure safe and proper operation, please read the instruction manual before use and familiarize yourself with the drill’s structure and operating procedures.
2. Wipe all parts of the drilling rig clean, and lubricate the rack portion of the mast with No. 20 machinery oil (GB443-64).
3. Move the drilling rig to the working position, adjust the support screws, and secure the test specimen in the machine’s dedicated fixture. Tighten the locking screws, then gently shake the rock to verify that it is firmly clamped.
4. After the drilling rig is securely fastened, connect the water nozzle to the water supply, turn on the water valve, and check for water flow; if water flows, this indicates normal operation.
5. Install the drill bit corresponding to the required hole size.
6. Connect the circuit, turn on the electrical switch, and rotate the feed handle to verify smooth operation and reliable movement. If all components operate smoothly, proceed with the intended operation.
4. Precautions for Use:
1. During drilling, the operator should feel only slight resistance and observe smooth cutting action; the feed rate should be approximately 4–5 m/min. As the hole nears completion, changes in cutting forces may cause some vibration; at this point, the feed rate should be appropriately reduced. Upon finishing the cut, promptly raise the drill bit rapidly until the cutting edge clears the workpiece, then shut off the drill and stop the water supply.
2. Throughout the drilling process, adequate water cooling must be maintained. If, when observing through the drill‑cutting groove, you notice insufficient water supply, stop drilling and inspect the system. However, when drilling is nearly complete, it is normal for water to flow into the lower layer without overflowing.
3. During hole neutralization and when rapidly lifting the drill bit at the end of drilling, do not stop the machine; instead, wait until the drill bit has just disengaged from the workpiece, then stop the spindle rotation before raising the drill bit.
4. During drilling, if the drill bit becomes stuck, promptly lift it slightly before resuming drilling; never force the bit to advance, as this may damage it.
5. If, during drilling, the motor temperature exceeds 70°C, stop the machine temporarily and resume operation only after it has cooled down.
6. Operate the toggle switch and rotate the handle in the forward direction to gently bring the drill bit into contact with the concrete surface. Only after the drill bit’s cutting edge has entered the groove may you apply pressure and begin drilling.
7. During the drilling process, if the drill bit fails to advance and the diamond layer on its surface is not fully exposed, use a highly abrasive material—such as refractory bricks or grinding wheels—to dress the cutting edge until the diamond layer is completely revealed. At this point, when you run your hand over the surface, it should feel rough; only then may you proceed with drilling.
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