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伸缩臂挖掘机遵从坚定的告急要素是什么?

日期:2019-03-19   源头:http://www.degradedijital.com/
  伸缩臂掘客机是一种多遵从工程呆板,作业敏锐,斲丧遵从高,工况顺应才气强,在交通运输、水利及电力工程和矿山采掘中发扬着告急的作用,由于液压伸缩臂掘客机工况条件相比恶劣:粉尘大、温度高、重负荷及延续作业。倡议机和液压体系做工时孕育发生较多的热量,据统计,在液压伸缩臂掘客机的弊端中,大局部弊端来至于倡议机与液压体系过热。因此,壮实的散热体系是包管伸缩臂掘客机遵从坚定的告急要素。
  Telescopic boom excavator is a kind of multi-functional construction machinery, which has the characteristics of sensitive operation, high consumption efficiency and strong adaptability to working conditions. It plays an important role in transportation, water conservancy, power engineering and mining. Because the working conditions of hydraulic telescopic boom excavator are comparatively bad: large dust, high temperature, heavy load and continuous operation. Starter and hydraulic system produce more heat during working. According to statistics, most of the faults of hydraulic telescopic boom excavator come from the overheating of starter and hydraulic system. Therefore, a reliable heat dissipation system is an important factor to ensure the stable performance of telescopic boom excavator.
  2 优化设计
  2. Optimum Design
  散热体系散热量Q与冷却风骚量M,散热面积A成正比,与进风温差Δt3成正比,即Q=f(M、A、Δt3),因此改良散热体系的散热遵从要从这三个关键因子采取计划。
  The heat dissipation Q of the heat dissipation system is proportional to the cooling air flow M, the heat dissipation area A, and inversely proportional to the temperature difference T3 of the intake air, i.e. Q=f (M, A, t3). Therefore, the improvement of the heat dissipation performance of the heat dissipation system should be planned from these three key factors.
  2.1 增长冷却风骚量
  2.1 Increase cooling air flow
  液压伸缩臂掘客机电扇优先采取低速、大直径吸风型电扇,运用外部高温气氛冷却液压油和冷却水,相比高速、小直径电扇冷却结果好和噪音低。因此,电扇的叶尖处线速率不克不及超越4200~5000m/min,餍足装置尺寸的外形下电扇直径尽管纵然选大。
  Hydraulic telescopic boom excavator fan preferred low-speed, large diameter suction fan, external low-temperature air cooling hydraulic oil and cooling water, compared with high-speed, small diameter fan cooling effect and low noise. Therefore, the linear speed at the tip of the fan can not exceed 4200-5000m/min, and the diameter of the fan should be as large as possible when the size of the device is satisfied.
  2.1.1 电扇与导风罩的轴向重合宽度
  2.1.1 Axial coincidence width between fan and guide hood
  关于吸风型电扇来说,庞大取电扇叶投影宽度的2/3宽度被导风罩罩住,此时能抵达大吸风遵从,别的,导风罩和散热器须密封风雅,包管冷却风不流失。
  For suction fans, the projection width of the common fan blade is 2/3 of the width of the hood, which can achieve high suction efficiency. In addition, the hood and radiator must be tightly sealed to ensure that the cooling air does not lose.
  2.1.2 电扇与导风罩的径向间隙
  2.1.2 Radial Clearance between Fan and Guide Hood
  实践上电扇与导风罩径向间隙越小,电扇旋转时惹起的表里压力差越大,吸风量越大,但由于伸缩臂掘客机工况条件相比恶劣,机身的振动约莫惹起电扇与导风罩的干预,因此志向间隙应设定为电扇直径的1.5~2.5,当间隙大于这个范围时2.5时,吸风量会剧减。
  Theoretically, the smaller the radial clearance between the fan and the guide hood, the greater the difference of internal and external pressure caused by the fan rotation, and the larger the suction capacity. However, due to the poor working conditions of the telescopic boom excavator, the vibration of the fuselage may cause the interference between the fan and the guide hood. Therefore, the ideal clearance should be set at 1.5-2.5 of the fan diameter. When the clearance is larger than this range, the suction capacity will decrease dramatically.
  2.1.3 电扇与散热器芯子的轴向隔绝
  2.1.3 Axial Spacing between Fan and Radiator Core
  依据各元素剖析步伐的央求及实行室的仪器配置外形,订定了以下剖析步分配套计划:原子荧光光谱法(AFS)检测As、Sb、Bi;ICP-OES检测Cu、Zn、Co、Ni、Cr;示波极谱法(POL)检测W、Mo;光谱深孔电极法(AES)检测Ag、Sn、Pb;石墨炉检测Au。
  According to the requirements of each element analysis method and the status of laboratory instruments and equipment, the following supporting plans for analysis methods were formulated: atomic fluorescence spectrometry (AFS) for the detection of As, Sb and Bi; ICP-OES for the detection of Cu, Zn, Co, Ni and Cr; oscillopolarography (POL) for the detection of W, Mo; spectroscopic deep hole electrode (AES) for the detection of Ag, Sn and Pb; graphite furnace for the detection of Au.
  2.1.4 出风口位置的选择
  Selection of 2.1.4 Outlet Location
  冷风完成热交流以后需求选择公允的出风口位置,出风要流利,确保倡议机室风压不克不及停滞冷却风进风速率,包管流经散热器的冷却风骚量为公允值。如图2所示的上下同时出风的要领,热交流后的热风可顺畅的排挤,有效的防范倡议机室内的“窝风”征象。同时为了飞扬泵室的温度,在倡议机室和泵室之间开透风口孔,使却风能同时流经泵室,提高散热结果。  2.4 飞扬液压体系背压
加长臂挖掘机出租
  After the cold air completes the heat exchange, it is necessary to choose a reasonable outlet position, and the outlet should be smooth, so as to ensure that the air pressure in the engine room can not obstruct the cooling air inlet speed, and ensure the cooling air flow through the radiator to be a reasonable value. As shown in Figure 2, the hot air can be discharged smoothly after heat exchange, effectively preventing the phenomenon of "nest wind" in the engine room. At the same time, in order to reduce the temperature of the pump room, the vent hole is opened between the engine room and the pump room, so that the wind energy flows through the pump room at the same time, so as to improve the heat dissipation effect. 2.4 Reducing Back Pressure of Hydraulic System
  伸缩臂掘客机散热体系有水散和油散两局部,水散体系采取节温器自动控制流经散热器的冷却水流量,使倡议机对峙在变乱温度。油散体系中液压油流量与体系背压有直接干系。液压体系背压越高,流经散热器的油量会越小,热交流量减小,油温高涨,可颠末几个步伐飞扬体系背压。
  The heat dissipation system of telescopic boom excavator has two parts: water and oil. The water dissipation system uses thermostat to automatically control the cooling water flow through the radiator, so that the starter keeps working temperature. There is a direct relationship between hydraulic oil flow rate and system back pressure in oil dispersion system. The higher the back pressure of the hydraulic system is, the smaller the amount of oil flowing through the radiator will be, the less the heat exchange will be, and the higher the oil temperature will be. Several measures can be taken to reduce the back pressure of the system.
  ①在餍足反转展转马达不吸空的条件下,将油路背压阀的开启压力降到小值;②飞扬散热器自身压损,减小回油过滤器的压力丧失;③液压油箱采取正面回油要领,减小回油阻力。
  On the premise that the rotary motor does not absorb air, the opening pressure of the back pressure valve of the oil circuit is reduced to a small value; the pressure loss of the radiator itself is reduced, and the pressure loss of the oil return filter is reduced; and the side oil return mode is adopted in the hydraulic tank to reduce the oil return resistance.
  散热器精良的散热结果可包管伸缩臂掘客机在高温、高湿和高尘等恶劣工况下变乱坚定性,本文剖析了影响散热器散热结果的关键要素,并从多个方面提出优化设计计划。为提高散热体系的散热遵从提供参考。
  The good heat dissipation effect of the radiator can ensure the stability of the telescopic boom excavator under the harsh conditions of high temperature, high humidity and high dust. This paper analyses the key factors affecting the heat dissipation effect of the radiator, and puts forward the optimal design plan from many aspects. It provides a reference for improving the heat dissipation performance of heat dissipation system.

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