Concrete mixer truck is a special truck used to transport construction concrete; because of its shape, it is often called a snail truck. This kind of truck is equipped with cylindrical mixing drum to carry the mixed concrete.
It is composed of automobile chassis, mixing drum, transmission system, water supply device, full power power power take-off device, front and rear bracket of mixing drum, reducer, hydraulic transmission system, feeding and discharging system, control mechanism, etc. Due to technical bottleneck, domestic four parts are used for domestic mixer tank with a volume of 3M × 3-8m × 3, and most of the four parts used for tank with a volume of 8m × 4 or above are imported parts.
Mixer car composition: Class II chassis, transmission system, hydraulic system, frame, mixing tank, feeding and discharging device, water supply system, control system, ladder and other parts. The front end of the mixing tank is connected with the reducer and installed on the front end of the rack, and the rear end is provided with two supporting wheel concrete mixing tank trucks installed on the back end of the rack through the raceway
With the rapid development of concrete production and construction technology, some countries have gradually adopted the way of centralized mixing and commercial supply of concrete. Concrete is provided by a special concrete mixing station, and then transported to various construction sites by concrete mixer trucks. This paper briefly introduces the structure principle and maintenance of concrete mixer.
The mixing drum is a concrete loading container, which is made of high-quality wear-resistant steel sheet. In order to automatically load and unload concrete, its inner wall is welded with special shape spiral blades. When rotating, the concrete moves along the spiral direction of the blade, and is mixed and stirred in the process of continuous lifting and turning. In the process of feeding and transportation, the mixing drum rotates positively, the concrete moves inward along the blade, and when discharging, the mixing drum reverses, and the concrete is discharged outward along the blade. The rotation of the mixing drum is guaranteed by the hydraulic drive device. The concrete mixer truck with a loading capacity of 3-6 cubic meters generally uses a hydraulic pump driven by an automobile engine through a power output shaft, and then a hydraulic motor driven by a high-pressure oil to drive the mixing drum. The truck mounted auxiliary diesel engine drives the hydraulic pump to drive the hydraulic Marta with a loading capacity of 9-12 cubic meters. The blade is the main part of the mixing device, which will lead to uneven mixing of concrete if it is damaged or severely worn.