Small concrete mixer truck is mainly composed of mixing drum and its auxiliary supporting parts. The mixing drum is a loading container for concrete. It is made of high-quality wear-resistant steel sheet. In order to automatically load and unload concrete, its inner wall is welded with spiral blades of special shape. When it rotates, 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 forward and the concrete moves inward along the blades. When discharging, the mixing drum reverses and the concrete is discharged outward along the blades.
The rotation of the mixing drum is ensured by the hydraulic driving device. The loading capacity is 3-6 cubic meters. Generally, the truck engine drives the hydraulic pump through the power output shaft, and then the high-pressure oil drives the hydraulic motor to drive the mixing drum. The truck auxiliary diesel engine drives the hydraulic pump to drive the hydraulic motor when the loading capacity is 9-12 cubic meters. The blade is the main component of the mixing device, and damage or serious wear will lead to uneven mixing of concrete. In addition, if the blade angle is not reasonable, the concrete will appear segregation, and the discharging speed of concrete mixer is slow
1. If the rotation direction of the can body is positive rotation during loading, the rotation of the vehicle during transportation is also positive rotation;
2. When the vehicle is loading, the engine drives the can body to rotate at a speed of 6-10 rpm; The concrete or mixture is discharged through the discharge port of the mixer, enters the mixing drum through the tube at the mouth of the drum through the charging system, and flows to the middle and lower part of the mixing drum under the guidance of the spiral blade
Working principle of small mixer transportation
For the premixed concrete added into the mixing drum, only 1 ~ 3R / min low-speed "positive" rotation is needed during transportation. At this time, the concrete is only slightly disturbed, so as to maintain the homogeneity of the concrete and prevent segregation, which is called stirring (commonly known as mixing)
Discharge principle of small mixer truck
When the vehicle is fully loaded, the tank always stirs at the speed of 1 ~ 3R / min, and the driving speed of the whole vehicle can not exceed 50km / h. If the vehicle runs too fast, it is easy to roll over when turning.