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Summary of concrete mixer knowledge

Sep. 01, 2021

Summary

  Special mechanisms mainly include power take-offs, front and rear brackets of the mixing drum, reducer, hydraulic system, mixing drum, operating mechanism, cleaning system, etc. Its working principle: take out the power of the car chassis through the power take-off device, and drive the variable pump of the hydraulic system, convert the mechanical energy into hydraulic energy and transmit it to the fixed motor, and then the motor drives the reducer. The reducer drives the mixing device to carry out Stir.

Power take-off

   The domestic concrete mixer truck adopts the power take-off method of the main vehicle engine. The function of the power take-off device is to take out the engine power by manipulating the power take-off switch, and drive the mixing drum through the hydraulic system. The agitating drum rotates in the forward direction during the feeding and transportation process to facilitate the feeding and mixing of the concrete. Reverse rotation, cut off the power connection with the engine after the end of the work.

Hydraulic system

The engine power taken out by the power take-off (now generally a rear-mounted full-function power take-off) is converted into hydraulic energy (displacement and pressure), and then output by the motor as mechanical energy (speed and torque) to rotate the mixer drum Provide motivation.

Reducer

   After decelerating the output speed of the motor in the hydraulic system, it is transmitted to the mixing drum.

Control mechanism

  A. Control the direction of rotation of the mixing drum so that it rotates forward during feeding and transportation, and rotates backward during discharge.

  B. Control the speed of the mixing drum

blender

  It is mainly composed of a mixing drum and its auxiliary supporting parts. The mixing drum is a concrete loading container. It is made of high-quality wear-resistant thin steel plate. In order to automatically load and unload concrete, the inner wall of the mixing drum is welded with special-shaped spiral blades. When rotating, the concrete moves along the spiral direction of the blades, and is mixed and stirred during the continuous lifting and turning process. During the feeding and transportation process, the mixing drum rotates forward, and the concrete moves inward along the blades. When discharging, the mixing drum reverses and the concrete is discharged along the blades. The rotation of the mixing drum is ensured by a hydraulic drive device. The loading capacity is 3-6 cubic meters. The concrete mixer truck generally uses the automobile engine to drive the hydraulic pump through the power output shaft, and then the high-pressure oil drives the hydraulic motor to drive the mixing drum, and the on-board auxiliary diesel engine drives the hydraulic pump to drive the hydraulic motor with a load of 9 to 12 cubic meters. The blade is the main part of the mixing device, damage or severe abrasion will cause uneven concrete mixing. In addition, if the angle of the blade is unreasonably designed, it will also cause segregation of the concrete.

Cleaning system

  The main function of the cleaning system is to clean the mixing drum, and sometimes it is also used to mix dry materials during transportation. The cleaning system also cools the hydraulic system.

Fully enclosed device

  The fully enclosed device adopts rotary sealing technology to seal the inlet and outlet of the mixer truck, and solve the problems of traditional mixer trucks such as water evaporation, mortar layering, concrete spilling, and driving safety.


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