A concrete mixer is a machine that mixes cement, sand and gravel aggregates and water into a concrete mixture. It is mainly composed of mixing drum, feeding and discharging mechanism, water supply system, prime mover, transmission mechanism, frame and supporting device.
According to the working nature, it can be divided into batch type (batch type) and continuous type; according to the stirring principle, it can be divided into self-falling type and forced type; according to the installation method, it can be divided into fixed type and mobile type; According to the structure of the mixing drum, it is divided into pear type, drum type, double cone, disc vertical shaft type and circular groove horizontal shaft type.
Operating procedures:
1. Before mixing, it should be empty for trial operation.
2. Adjust the timing of the time relay according to the stirring time, pay attention to the adjustment in the case of power failure.
3. Wet the mixing drum, blades and site with water.
4. If there is an electrical or mechanical failure in the process, part of the mixture should be unloaded, the load should be reduced, and the machine should be started after troubleshooting.
5. When operating, it should be checked frequently to prevent accidents such as electric shock and mechanical injury.
6. After the test is completed, turn off the power supply, clean the mixing drum and the site, and clean up.
Precautions:
1. The concrete mixer should be set in a flat position, and the front and rear axles should be padded with square wood, so that the tires are placed in the air, so as to avoid walking when starting.
2. The concrete mixer should implement secondary leakage protection. After the power is turned on before going to work, it must be carefully inspected, and it can be used only after the empty vehicle trial transfer is deemed qualified. During the trial operation, it should be checked whether the rotating speed of the mixing drum is suitable. In general, the speed of the empty car is slightly faster than that of the car (after loading) by 2 to 3 revolutions. If the difference is large, the ratio of the driving wheel to the transmission wheel should be adjusted.
3. The rotation direction of the mixing drum should be in accordance with the direction indicated by the arrow. If it is not true, the motor wiring should be corrected.
4. Check whether the transmission clutch and brake are flexible, whether the wire rope is damaged, whether the track pulley is in good condition, whether there is no obstacle around and the lubrication of various parts, etc.
5. After starting the machine, always pay attention to whether the operation of each part of the concrete mixer is normal. When shutting down, always check whether the blades of the concrete mixer are bent, and whether the screws are knocked down or loose.
6. When the concrete is finished mixing or it is expected to stop for more than 1 hour, in addition to draining the remaining materials, pour the stones and water into the shaker, turn on the machine, rinse the mortar sticking to the barrel and discharge it all. There should be no accumulated water in the barrel to prevent the barrel and blades from rusting. At the same time, the dust accumulation outside the mixing drum should also be cleaned to keep the machinery clean and in good condition.
7. After get off work and when the machine is not in use, switch off the power and lock the switch box.
