Steel Bar Threading Machine Pre-Operation Checks
- Steel Bar Threading Machine Electrical Inspection:
- Inspect electrical parts for any damage.
- Ensure the machine body is properly grounded.
- Power Supply Verification:
- Confirm that the power supply voltage matches the machine’s working voltage.
- Ensure the distribution box is located within 3 meters of the motor.
- Safety Components:
- Verify that the machine is installed smoothly with complete and reliable safety protection components.
Initial Setup
- Idle Test:
- Run the machine without load to test both the forward and reverse functions of the motor.
- Ensure that the machine and the water pump are functioning correctly.
Preparing Steel Bars
- Selection:
- Choose steel bars that exhibit good longitudinal linearity.
- Ensure the cut end face is perpendicular to the steel bar’s axis. If not, cut and polish the end face before threading.
Loading Steel Bars
- Teamwork for Lifting:
- With the assistance of another person, lift the steel bar onto the workbench.
- Clamp it securely and adjust for concentricity to prevent loosening and potential injuries.
Threading Process
- Starting the Threading:
- Begin threading slowly, gradually increasing speed while maintaining a uniform threading speed.
- Ensure that the thread teeth remain intact to prevent equipment damage.
Handling Semi-Finished Products
- Lifting:
- After processing the first thread, use the help of another person to lift it onto the semi-finished material rack.
- Connect and lock it using the appropriate sleeve, ensuring proper locking and threading quality by observing and feeling for tightness.
Quality Inspection
- Sampling:
- Sample threaded connectors under the supervision of a witness and send them to the laboratory for quality inspection.
- If the laboratory inspection passes, continue processing threaded joints of the same specification.
Troubleshooting
- Immediate Actions:
- If the machine operates poorly or the knife gets stuck, stop the machine immediately for inspection and repair.
- Debris Cleaning: Do not clean debris from the blade while the machine is operating.
Safety Measures
- Personal Protective Equipment:
- Operators must wear goggles.
- Avoid touching rotating parts while wearing gloves.
Post-Processing Care
- Cleaning and Protection:
- Clean the processed threaded interface and protect it from rain and corrosion.
- Ensure the coolant is clean and free of impurities; replace it monthly.
- Add and replace gear oil in the reducer every three months.
Maintenance
- Regulatory Compliance:
- Perform maintenance and repair on the machine according to established regulations.
End of Operation
- Power Down Procedures:
- Turn off the power and lock the distribution box.
- Clean the work area before leaving.
Steel Bar Threading Machine Standard Sleeve Geometric Dimension
| Specifications | Sleeve Length (mm) | Thread Length (mm) | Thread Number | Pitch (mm) |
|---|---|---|---|---|
| 16 | 45 | 22.5 | 9 | 2.5 |
| 18 | 55 | 27.5 | 11 | 2.5 |
| 20 | 60 | 30 | 12 | 2.5 |
| 22 | 65 | 32.5 | 13 | 2.5 |
| 25 | 70 | 35 | 12 | 3.0 |
| 28 | 80 | 40 | 13 | 3.0 |
| 32 | 90 | 45 | 15 | 3.0 |
Minimum Tightening Torque for Straight Thread Joint Installation
| Rebar Diameter (mm) | Tightening Torque (N·mm) |
|---|---|
| ≤16 | 100 |
| 18–20 | 200 |
| 22–25 | 260 |
| 28–32 | 320 |
| 36–40 | 360 |
| 50 | 460 |
