Note: The speed control knob is preset at the maximum speed of the factory to protect the drive system from damage during transportation. Therefore, the setting of the knob should be checked before use to ensure that it is suitable for the stirred liquid; if the correct speed is not determined, rotate the knob to a minimum . After Overhead Stirrer  is not used for a period of time, the friction noise will be heard at the initial connection, Overhead Stirrer is caused by the prestress on the lining of the friction wheel, which has no harm to the function of the mixer, and the noise will disappear after a short operation. The rotating head and mixing shaft allow the mixing rod to have a maximum diameter of 10mm. Overhead Stirrer  is driven by friction wheels The less speed control is realized, but the motor is always running at a fixed working point, and the highway output speed and torque of the motor reach the optimal value at this point and basically remain constant. Power is transferred to the mixing shaft via a friction wheel and a medium shaft fitted with a pair of plastic couplers. Two gear trains are configured to form a manually adjustable two-gear speed on the same two shafts. If the loss in power transmission is ignored, the power at the mixing shaft is always equal to the motor output, and the pair of spiral couplers on the center shaft maintain low wear using the friction wheel. The coupling device automatically adjusts the required pressure on the friction wheel according to the load on the shaft of the agitator, and the low load causes low pressure and high The load causes a high lowering pressure. In the experiment, attention should be paid to the position of the mixing head and the size of the container, especially the glass container. The mixer must be closed before shifting, otherwise the deceleration gear may be damaged. The machine is equipped with two gear speed, I gear for low speed, II gear for high speed. The preset position is high grade, high grade low when counterclockwise (look from top to bottom) turn the plastic rubber bearing sleeve to stop, pull down 5.5mm and then turn clockwise until you hear the sound of the steel bead reset in the bearing sleeve. When gear I changes gear II, rotate the shaft sleeve counterclockwise to the stop position, push up by 5.5mm, and then rotate clockwise until the steel ball reset sound.

1. Mixer Lab  should be placed in a clean and dry place, keep clean and tidy, to prevent moisture, the use environment should not exceed 40℃, strictly prevent all kinds of foreign bodies from splashing into the motor.

2. When Mixer Lab  is used in a humid environment, please use a leakage protection device to ensure the personal safety of the operator.

3. When Mixer Lab  is used in a strong corrosion environment, in order to prevent mechanical and electrical performance damage, please pay attention to the necessary protection measures.

4. Overhead Mixer s strictly prohibited to using flammable and explosive gas in the air.

5. If Overhead Mixer  is used in the power grid with fierce voltage fluctuations, Overhead Mixer  will cause the speed control. Please use the power supply voltage regulator device.