The concrete mixer truck is composed of a vehicle chassis and a special device for concrete mixing and transportation. Its special mechanism mainly includes a power take-off, a front bracket of the mixing drum, a reducer, a hydraulic system, a mixing drum, a control mechanism, a cleaning system, etc. The working principle is to take the power of the automobile chassis through the power take-off device, and drive the variable pump of the hydraulic system to convert the mechanical energy into the hydraulic energy to the fixed motor, and then the motor drives the reducer, and the reducer drives the mixing device to mix the concrete. So, what is the working principle of the concrete mixer truck? The main systems are as follows:
The 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 positively 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.
The concrete mixer truck converts the power into hydraulic energy (displacement and pressure) through the power take-off, and then outputs mechanical energy (speed and torque) through the motor to provide power by the rotation of the mixing drum.
The output speed of the hydraulic system motor of the concrete mixer truck is decelerated and transmitted to the mixer drum.
(1) Control the direction of rotation of the mixing drum so that it rotates in the forward direction during the feeding and transportation process and when it is discharged in the reverse direction
(2) Control the speed of the mixing drum
The mixing device 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 concrete mixer truck with a loading capacity of 3-6 cubic meters generally adopts the hydraulic pump driven by the automobile engine through the power output shaft, and then the hydraulic motor driven by the high-pressure oil to drive the mixing drum. The loading capacity of 9-12 cubic meters is driven by the on-board auxiliary diesel engine. The hydraulic pump drives the hydraulic motor. 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.
The main function of the cleaning system is to clean the mixing drum. Sometimes it is also used to clean the dry material mixing drum during transportation, and the system also cools the hydraulic system.
The working principle of the concrete mixer truck is to use the rotation of the hopper to slow down the speed of concrete setting. Mainly by changing the angle of the hydraulic pump plunger sliding plate to change the pump displacement to change the mixing tank speed, changing the tendency of the hydraulic pump plunger sliding plate to change the flow direction to achieve forward and reverse, and then adjust the engine throttle to change the mixing Rotation speed of the tank. Luoyang Zhongyuan Mining Machine Manufacture Co., Ltd. specializes in the production and development of concrete mixer trucks, which can be customized according to customer needs. Interested parties are welcome to come to consult.
Operation points and precautions of concrete mixer truck
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