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小型混凝土搅拌车预热有哪些大学问?

来源:http://www.zishangliaojiaobanji.cn 日期:2020-11-16 发布人:admin
概述:小型混凝土搅拌车是在通用载重汽车底盘上改装的,预留有飞轮取力器,其搅拌装置多利用取力器传动轴带动液压泵,搅拌装置提供动力。搅拌装置
小型混凝土搅拌车是在通用载重汽车底盘上改装的,预留有飞轮取力器,其搅拌装置多利用取力器传动轴带动液压泵,搅拌装置提供动力。搅拌装置液压系统一般采用闭式系统。当车辆启动时,若取力器和发动机飞轮处于啮合状态,则液压泵会随同转动。在液压油黏度很高的状态下,若液压泵处于负载工作状态就会发生吸油困难,甚至会发生“吸空”现象,液压泵会因润滑不良造成过度磨损。同时,液压马达和转罐减速机也会在润滑不良的工况下被动运转,造成磨损严重。这就是搅拌装置须预热的根本原因。
The small concrete mixer is refitted on the chassis of general truck, and the flywheel power take-off is reserved. The mixing device mostly uses the power take-off drive shaft to drive the hydraulic pump, and the mixing device provides power. The hydraulic system of mixing device generally adopts closed system. When the vehicle is started, if the power take-off and engine flywheel are in meshing state, the hydraulic pump will rotate with it. Under the condition of high viscosity of hydraulic oil, if the hydraulic pump is in the working state of load, it will be difficult to absorb oil, and even "empty" phenomenon will occur. The hydraulic pump will cause excessive wear due to poor lubrication. At the same time, the hydraulic motor and turret reducer will also run passively under the condition of poor lubrication, resulting in serious wear. This is the fundamental reason why the mixing device must be preheated.
小型混凝土搅拌车液压系统的输出转矩和功率与负载有关,液压泵排量越大,混凝土罐体总质量越大,所形成的阻力也越大。若启动时,搅拌筒操作手柄未置于空挡位置,则启动阻力较大,该阻力将会造成发动机马达启动困难,耗费更多的电能,也可能造成启动马达过早损坏。
The output torque and power of the hydraulic system of the small concrete mixer truck are related to the load. The larger the displacement of the hydraulic pump is, the greater the total mass of the concrete tank is, and the greater the resistance is. If the operating handle of mixing drum is not set at neutral position, the starting resistance will be large, which will cause difficulty in starting the engine motor, consume more electric energy, and may cause premature damage of the starting motor.
小型搅拌机
在罐体静止状态下启动发动机时,飞轮取力器依然带动取力器传动轴和液压泵转动,增加的启动负荷只是取力器传动轴和液压泵的空转阻力,这个阻力与整个转罐传动系统的阻力相比明显降低了很多,所以液压泵柱塞体和柱塞的磨损可以降低到较低程度。而且,由于液压泵不作功,液压马达和转罐减速机也就不工作,所以也不会形成磨损。因此,在罐体静止状态下启动发动机,是所有小型混凝土搅拌车降低发动机启动负荷的较佳方法。在罐体静止状态下启动发动机,能使整个转罐系统在磨损降低的同时,将液压油的温度逐渐升高,黏度逐渐降低。
When the engine is started under the static state of the tank body, the flywheel power take-off still drives the power take-off drive shaft and the hydraulic pump to rotate. The increased starting load is only the idle resistance of the power take-off drive shaft and hydraulic pump, which is significantly reduced compared with the resistance of the whole rotating tank transmission system, so the wear of the plunger body and plunger of the hydraulic pump can be reduced to a lower level. Moreover, because the hydraulic pump does not work, the hydraulic motor and the rotating tank reducer will not work, so there will be no wear. Therefore, starting the engine in the static state of the tank is a better way to reduce the starting load of the engine for all small concrete mixers. Starting the engine under the static state of the tank can make the whole rotating tank system reduce the wear, and gradually increase the temperature and viscosity of the hydraulic oil.
液压泵空转一段时间之后,可以让罐体缓慢转动,给液压马达和管路中的油液进行预热。同时,转罐减速机也开始自我预热。直到整个转罐系统的油液都达到工作温度,预热工作即结束需要特别提出的是,搅拌装置预热期间严禁过早、过快提高发动机转速。应在启动后低速运转10min后,再加载运转。具体的发动机转速和预热时间控制,要根据环境温度和小型混凝土搅拌车状况因地制宜。一般说来,环境温度越低,空载预热的时间应越长。同时须注意,预热操作程序绝对不可以违背设备使用说明书的相关规定。
After the hydraulic pump idles for a period of time, the tank can be turned slowly to preheat the oil in the hydraulic motor and pipeline. At the same time, the turret reducer also began to self warm up. When the oil of the whole rotating tank system reaches the working temperature, the preheating work will be finished. It is specially pointed out that it is strictly forbidden to increase the engine speed too early and too fast during the preheating period of the mixing device. It should be operated at low speed for 10 min after starting, and then loaded for operation. The specific control of engine speed and preheating time should be based on the ambient temperature and the condition of small concrete mixer truck. Generally speaking, the lower the ambient temperature, the longer the no-load preheating time should be. At the same time, it should be noted that the preheating operation procedure must not violate the relevant provisions of the equipment operation manual.
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