The main function of the cleaning system is to clean the mixing drum, and sometimes it is also used for dry material mixing during transportation. The cleaning system also cools the hydraulic system.
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Overview
The special mechanism mainly includes the power take-off, the front and rear brackets of the mixing drum, the reducer, the hydraulic system, the mixing drum, the control mechanism, the cleaning system, etc. Its working principle: The power of the car chassis is taken out through the power take-off device, and the variable pump of the hydraulic system is driven, and the mechanical energy is converted into hydraulic energy and transmitted to the quantitative motor. The motor then drives the reducer, and the reducer drives the mixing device. Stir.
power take-off
The domestic concrete mixer truck adopts the power-taking method of the main vehicle engine. The function of the power take-off device is to take out the engine power by operating the power take-off switch, and drive the mixing drum through the hydraulic system. Reverse rotation, disconnecting power from the engine after work is over.
Hydraulic system
The engine power taken out by the power take-off (now generally a full-function power take-off at the rear) is converted into hydraulic energy (displacement and pressure), and then output by the motor into mechanical energy (speed and torque), which is used for the rotation of the mixing drum. Provide power.
reducer
After decelerating the output speed of the motor in the hydraulic system, it is transmitted to the mixing drum.
Manipulator
a. Control the rotation direction of the mixing drum so that it rotates in the forward direction during feeding and transportation, and rotates in the reverse direction when discharging.
b. Control the speed of the mixing drum
Stirring device
It is mainly composed of 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, its inner wall is welded with a special-shaped spiral blade. When rotating, the concrete moves along the spiral direction of the blade, and is mixed and stirred during the continuous lifting and turning. 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 outward along the blades. The rotation of the mixing drum is ensured by the hydraulic drive device. The loading capacity is 3 to 6 cubic meters. The concrete mixer truck generally adopts the hydraulic pump driven by the car engine through the power take-off shaft, and then the hydraulic motor is driven by the high pressure oil to drive the mixing drum. The blade is the main component in the mixing unit, and damage or severe wear can cause uneven mixing of concrete. In addition, if the angle of the blades is not properly designed, the concrete will segregate.
cleaning system
The main function of the cleaning system is to clean the mixing drum, and sometimes it is also used for dry material mixing during transportation. The cleaning system also cools the hydraulic system.
Totally enclosed device
The fully enclosed device adopts rotary sealing technology to seal the inlet and outlet of the mixer truck, which solves a series of problems such as water evaporation, mortar stratification, concrete scattering, and driving safety in traditional mixer trucks.
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