A concrete concrete truck and its continuous mixing automatic control method

Abstract

The invention discloses a concrete concrete truck. The concrete concrete truck comprises a vehicle chassis, a concrete mixing structure fixed on the vehicle chassis, and a power unit; the concrete mixing structure includes a mixing drum, an auxiliary mixing structure, and a frame body of the auxiliary mixing structure. The support is provided with inclined paddle blades; the power unit includes a main power shaft and an auxiliary power shaft, and drives the mixing drum and the auxiliary mixing structure respectively; the invention also discloses an automatic control method for continuous mixing of a concrete truck. The method is connected with the controller through the vehicle speed sensor and / or the acceleration sensor, and the controller judges the current working condition of the concrete mixer according to the change of the value received by the sensor, and outputs the corresponding control signal according to the determined working condition to control the main The power shaft and the auxiliary power shaft perform power output. The invention can control the stability of the concrete mixing structure and improve the mixing effect and mixing efficiency of the mixing drum.

Description

technical field [0001] The invention relates to the control technology of concrete commercial concrete vehicles in the technical field of engineering machinery, in particular to a concrete concrete vehicle and a continuous stirring automatic control method thereof. Background technique [0002] As a building material, concrete is mainly composed of stone, sand, water, cement, fly ash, mineral powder, additives and other materials as components, which are made after stirring and mixing. Generally speaking, in addition to the relationship between the raw materials and the mixing process, the quality of concrete pouring and molding has a greater relationship. During the concrete mixing process, the uniformity of the mortar directly affects the pouring performance, adhesion performance and post-forming performance of the concrete. The curing strength and stability will affect the overall structure of the building, so it is necessary to fully and uniformly mix the raw materials o...

AI Technical Summary

Problems solved by technology

However, due to the special nature of the concrete concrete truck during use, unlike ordinary vehicles with tops such as pump trucks and trailers, which do not work when the tops are running, the concrete concrete truck needs to perform mixing operations during driving. The mixing drum The mixing speed is determined by the engine speed and the displacement of the hydraulic pump. If the engine speed and the variable pump displacement are set to a constant value to adjust the constant speed of the mixing drum, the driver will have random acceleration, deceleration or other problems in the process of driving the vehicle. Operations that affect the engine speed will cause large fluctuations in the hydraulic oil flow rate that is controlled by the engine speed to control the output of the variable pump. If the speed change rate is too large, it will affect the torque output ratio of the engine in a short time, resulting in agitation. The stability of the rotation of the drum decreases, causing the rapid change of the speed of the mixing drum of the concrete truck, resulting in a large difference in the power required by the concrete mixer truck under different working conditions, so that the mixing stability of the mixing drum decreases, and the engine and load It is difficult to achieve the best power matching, which will not only affect the mixing quality of concrete, but also easily lead to increased fuel consumption of concrete mixer trucks or insufficient power output. In severe cases, it will also cause the center of gravity of the mixing drum to shift, affecting safe driving of vehicles

[0005] Although there are also some processing methods to deal with the above-mentioned problems in the prior art, if some mixer truck chassis are provided with multi-state switches (such as heavy load, medium load, light load, etc.), the driver can choose according to his own judgment when driving. Drive in a suitable gear to achieve the purpose of improving the stability of the mixing drum under working conditions. However, due to the poor self-adaptive ability of the system, it is troublesome to operate. In order to save trouble, many drivers directly hang it under heavy or medium load. It leads to an increase in fuel consumption of the vehicle; some use an independent power system to control the operation of the mixing drum, which is different from the traditional concrete truck that relies on the hydraulic system to drive the mixing drum to rotate. On this concrete truck with an independent power system, the mixing drum The rotation depends on the power source independent of the hydraulic system, but this independent power system will obviously increase the cost of equipment manufacturing and operation, and the practicability is poor

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