Research on the constant-speed operation mechanism of the tank body of the concrete mixing truck and the guarantee of concrete quality by the operation specifications of the inlet and outlet

The concrete mixing truck (commonly known as the mixer truck) is responsible for transporting the ready-mixed concrete from the mixing station to the construction site in quality and quantity.Its core functions are the constant-speed operation mechanism of the tank body and the standardized operation specifications for inlet and outlet. Together, the two constitute the key to maintaining the workability (slowness, and ease) of concrete during transportation.The constant-speed operation mechanism of the tank is designed to prevent the isolation and initial condensation of concrete during long-distance transportation.Segregation refers to the sinking of aggregates with a large specific gravity and the floating of mortar; initial condensation is the hardening of concrete caused by the hydration reaction of cement.During transportation, the tank body of the mixer truck will continue to rotate at a slow speed (agitation speed) of about 2-5 revolutions per minute, so that the concrete will continue to roll and mix in the tank, thereby maintaining its uniformity and plasticity.This power comes from the hydraulic drive system installed on the vehicle. The power take-off device obtains power from the chassis engine, drives the hydraulic pump, and then drives the hydraulic motor to rotate the tank.

The operation specification of inlet and outlet is the final link to ensure the final quality of concrete.When loading in the mixing station, the rotation of the tank should be started first, and then concrete should be added to prevent material accumulation.After loading and before arriving at the construction site, it is usually necessary to keep the tank rotating at an agitation speed.Before arriving at the site for unloading, if you need to improve the ease of concrete (due to the loss of slowness), you can quickly rotate (stirring speed) for secondary stirring, but the time should not be too long, and unauthorized addition of water is strictly prohibited. When water must be added, it must be added in accordance with technical regulations and fully stirred with the concrete.When unloading, the tank is reversed by manipulating the tank body and the reversal speed is controlled to make the concrete flow out evenly.During the unloading process, the tank body should be kept continuously reversed until it is emptied.

Daily maintenance is essential to ensure the implementation of these mechanisms and norms.The hydraulic system needs to check the oil level and oil temperature filter regularly to ensure stable and reliable power.The tank raceway and support wheels need to be well lubricated to reduce wear.The control handle or button of the operating system should be sensitive and accurate.The operator (driver) is the last guardian of the quality of concrete. He must undergo strict training, understand the operating principle of the tank, be familiar with the operating procedures for inlet and outlet, and have the ability to deal with common problems such as blockage and stuffy tanks.Only by combining reliable equipment with standardized operation can we ensure that every truck of concrete maintains the good workability required by the design when it arrives at the construction site, and lays a solid foundation for the quality of the final structure.