Operating Rules for PUHLER grinding Mill

Operating Rules for PUHLER grinding Mill

  • Dec 16,2019.

Start-up preparation:

Check the sealing liquid level (should be located between the upper and lower limit of the sealing liquid container to avoid too high or too low).Open the cooling water valve and adjust the pressure to 3-4bar, open the compressed air main valve and adjust the tank pressure to 4-4.5bar.Add the grinding medium.For the first operation, the filling amount of medium shall not exceed 80% of the grinding chamber volume or 85% of the installed power current.


Grinding operation:

Start the pump to feed the material into the grinding barrel until the material flows out of the sander outlet (the pump motor or switch is interlocked with the main machine and must be started successively within 20 seconds; the pump motor can be started repeatedly to fill the grinding chamber with material to prevent dry grinding);Start the main engine and adjust the pump speed to the appropriate speed according to the product fineness and temperature control.


Shutdown and cleaning:

After the fineness of the product meets the requirements, stop the main engine and stop the pump after no material flows out.Clean with solvent or mixture (to prevent self-grinding or over-grinding between the grinding chamber and zirconium beads, clean for about 10 minutes).Sand mill must use a separate tank for gas supply and pressure, for pneumatic diaphragm pump feed, it is recommended to use air dryer filter air.After shutdown, 2.5-3bar pressure shall be provided in the sealing fluid storage tank for mechanical seal pressure protection, and the pressure setting on the sealing fluid storage tank shall be greater than the pressure setting on the pressure gauge on the grinding barrel, which shall be more than 1.5bar.If temporary shutdown is needed, and the interval is long (continue grinding every other day), before shutdown, a small amount of solvent should be added to the body of the grinding cylinder to dilute the product, so as to facilitate the next time easy to start the machine.



Every day:

Check the liquid level on the sealed liquid storage tank;Check the pressure of sealed liquid storage tank;Check and clear the liquid in the sealing liquid collecting bottle (located in the machine base);

Every week:

Check whether the electrical control elements are working properly (electric contact thermometers, electric contact pressure gauges, pressure switches and gauges, emergency stop buttons, etc.).

Every 3 months:

replace seal fluid (if use water as seal fluid, replace once a month).Grease is injected into the bearing.


The following grease is recommended:

Aral: Grease HL3.Esso: Beacon 3;Mobile: Mobilux 3;SKF: Walzerol 4.


check and adjust belt tension, check current fluctuation value, adjust zirconium bead filling rate according to current fluctuation;Maintenance switch, electrical control cabinet maintenance switch function.


Malfunction and Solutions:

The host machine cannot start or stop automatically during operation:

Seal fluid level switch break -- add seal fluid;

Air pressure switch break - adjust air pressure;

Abrasive chamber pressure gauge break - pressure relief, reduce pump speed, clean the outlet of the sander gap separator;

Outlet temperature meter - increase cooling water flow and decrease cooling water temperature;

Shutdown of main engine thermal protection -- reset of thermal relay to adjust load;

V belt too loose - tighten belt;The size of grinding medium is not suitable for replacement;

Steering error of main motor and rotor -- wrong phase of motor cable connection;


Pump non-suction:

Pump motor steering error -- check and correct;Suction line into the air - from the funnel into the solvent, the discharge of air;Line products are dry and hard - clean lines and pumps.


High host current:

Excessive filling of grinding medium -- reduce filling amount;Product viscosity is too high - increase low viscosity liquid.The feed is too fine, the separator clearance is too small -- change the large size;Feed pump flow is too large - reduce pump speed.


High consumption of sealing fluid:

Pressure of sealing liquid container is too high -- adjust pressure;Mechanical seal failure - repair and replacement.


Maintenance treatment:

When the machine cannot run normally and needs to be repaired, please clean up all the impurities in the inner cavity, and then inform the after-sales service to deal with them on site.If the impurities stay in the inner cavity for a long time, different chain damage will occur.

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