What precautions should be taken when installing a sand mill?

1. Installation environment preparation
1. Site requirements
Choose a flat and solid ground (such as a cement floor or a steel structure platform). The ground load-bearing capacity must meet the total weight of the equipment (including materials) to avoid equipment tilting due to ground subsidence.
Reserve enough operating space: at least 1-1.5 meters of passages should be reserved around the equipment to facilitate maintenance, feeding, unloading and heat dissipation, while avoiding proximity to heat sources or highly corrosive environments.
2. Environmental conditions
The ambient temperature should be controlled at 5-40℃, the humidity ≤85% (no condensation), and excessive dust should be avoided (dust covers or ventilation equipment can be installed).
Stay away from vibration sources (such as large punching machines, air compressors) to prevent resonance from affecting grinding accuracy; if it cannot be avoided, vibration isolation treatment (such as installing rubber pads) is required.
2. Equipment placement and fixation
1. Horizontal adjustment
After the equipment is in place, use a level (accuracy 0.1mm/m) to check the horizontality of the main machine body and the grinding cylinder (front and back, left and right directions), and adjust the anchor bolts or shims to make the horizontal error ≤0.2mm/m.
Excessive horizontal deviation will cause uneven gaps between the rotor and the stator, aggravating wear, vibration and noise.
2. Fixing method
Small and medium-sized sand mills: can be fixed to the pre-buried steel plate on the ground through anchor bolts (the bolts need to be coated with rust inhibitor) to prevent displacement during operation.
Large sand mills: It is recommended to cast a concrete foundation (foundation thickness ≥ 1/3 of the equipment height), and install shock-absorbing pads (such as nitrile rubber pads) between the foundation and the equipment to reduce vibration transmission.
3. Pipeline and connection installation
1. Feed/discharge pipeline
The pipeline material must be compatible with the material (such as stainless steel pipes for corrosive materials, and hoses should avoid contact with high temperatures), and the pipe diameter must match the equipment interface (avoid being too thin to cause blockage or too thick to affect flow).
Pipeline connections use flanges or quick connectors to ensure sealing (install wear-resistant sealing rings, such as polyurethane or fluororubber) to prevent material leakage; hard pipes need to be fixed with brackets to avoid compression of equipment interfaces due to their own weight.
2. Cooling water pipeline
If the equipment has a cooling system (such as a grinding cylinder jacket), the cooling water pipeline needs to be connected separately, the water inlet pressure is controlled at 0.2-0.4MPa, and the water quality needs to be clean (filters can be installed) to avoid scale blockage.
After the pipeline is installed, it needs to be tested for water leakage to ensure smooth circulation of the cooling medium.
IV. Electrical system installation
1. Power supply configuration
The power supply voltage and frequency must be consistent with the equipment nameplate (such as 380V/50Hz), and an air switch (capacity is 1.5-2 times the rated current of the equipment) must be configured separately, and overload protection and grounding devices (grounding resistance ≤4Ω) must be installed.
The cross-sectional area of the wire meets the current carrying capacity requirements (such as 10kW equipment requires ≥4mm² copper core wire) to avoid heating or tripping due to insufficient wire diameter.
2. Control system connection
Signal lines (such as PLC control, speed feedback) need to be wired separately from power lines (spacing ≥ 30cm) to avoid electromagnetic interference; signal lines use shielded lines, and the shielding layer is grounded at one end.
After connection and before power on, check whether the wiring terminals are tight and whether the forward and reverse wiring is correct (you can manually turn the wheel to confirm the direction).
V. Installation of auxiliary equipment
1. Grinding medium addition
Before installation, the grinding medium (such as zirconia beads, glass beads) must be selected according to the material requirements, the particle size must match the grinding gap (the medium diameter must be ≤1/3 of the grinding gap), and the addition amount must be 70%-80% of the effective volume of the grinding cylinder (too much can easily lead to excessive temperature rise, and too little can affect the grinding efficiency).
The first addition must be poured slowly to avoid impact damage to the cylinder or rotor.
2. Other auxiliary devices
If equipped with a material delivery pump (such as a gear pump or a diaphragm pump), ensure that the height difference between the pump and the sand mill feed port is reasonable (to avoid air suction), and the pump flow rate matches the sand mill processing capacity.
Install a filter device (such as a bag filter) at the discharge port to prevent the medium from leaking and contaminating the material.
VI. Inspection before trial operation
1. Mechanical inspection
Manually rotate the rotor (or by jogging the motor) to confirm that there is no jamming or abnormal noise, and the gap between the rotor and the stator is uniform (can be measured by a feeler gauge).
Check whether the fasteners of each component (such as rotor fixing bolts and grinding cylinder end cover screws) are tightened to prevent loosening.
2. Electrical inspection
After power on, check whether the motor direction is correct (consistent with the equipment identification), whether the control system (such as touch screen, inverter) displays normally, and whether the emergency stop button is sensitive.
3. No-load test
Run no-load for 30 minutes, monitor the bearing temperature (≤70℃), vibration value (≤0.1mm/s) and noise (≤85dB), if abnormal, stop the machine for investigation.