The mixing drum is the key component of the whole mixer truck. As a container for storing concrete, it plays a decisive role in preventing its curing and segregation. It is composed of mixing cylinder, supporting wheel, etc.
The cylinder is assembled and welded by front cone section, rear cone section, cylindrical section, head, blade, feeding cone, raceway, etc. The front end is connected with the reducer, and the rear end is supported on the subframe through supporting wheels. The supporting wheel plays the role of supporting the drum body and is composed of support, bearing seat, shaft, bearing, etc.
The shell and blades of the mixing drum are made of high-strength steel plate, which has higher wear resistance. The head is formed by one-time spinning and has sufficient stiffness and strength after welding with the reinforcing plate.
The feeding cone directly affects the feeding speed of the whole vehicle. If the speed is too fast, segregation will occur, and if the feeding speed is too slow, work efficiency will be affected. Therefore, the feeding cone is designed to be funnel-shaped, large-diameter, and the feeding speed is maintained at 3.2m3/min, which can ensure smooth feeding and prevent concrete overflow.
The raceway is forged as a whole. After the whole cylinder is welded, the outer ring shall be processed to ensure the coaxiality requirements.
The optimized mixing drum has reliable structural stiffness, good wear resistance, smooth feeding and discharging, and low residue. It can not only mix concrete, but also stir and transport ready mixed concrete. There is no discharge segregation, ensuring the uniformity of concrete.
The subframe of the automatic mixer truck is the main load-bearing part, and the load during operation is almost supported by it. In addition, the impact load formed by the bumpiness of the road and acceleration and deceleration during driving puts forward high requirements for the structure of the subframe.
The whole subframe is composed of main beam, foreground support frame and background support frame.
The main beam adopts an integral box structure beam, which fundamentally enhances its torsional, flexural and tensile properties, and ensures the rigidity requirements. An auxiliary beam is added between the two main beams to adjust the rigidity of each section of the main beam, so that the load is more evenly distributed over the whole length of the subframe.
In the process of driving, it is inevitable to adopt emergency braking in case of special circumstances, and the inertia force caused by this is very large. In addition, the mixing drum itself has a certain inclination angle, so the load borne by the front desk of the subframe is relatively much larger, and this part of the load is mainly added to the six bolts connecting the reducer and the front support seat. In order to prevent the bolts from being cut off and causing accidents, thrust blocks are added to the front support platform, So that the bolt is not affected by the shear force, so as to ensure the safety of vehicle operation.
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