自卸汽車(chē)外文翻譯

1、<p><b>　　外文資料翻譯</b></p><p>　　Dump Truck</p><p>　　Dump Truck mainly refers to the delivery of goods unloaded the car and there is dumping the car, also known as Dump Trucks. <

2、/p><p>　　Dump Truck is characterized by its compartment can be tilted a certain angle, so that unloading the goods inside. Tilting train is a Dump Truck engine power, through the dumping of bodies to complete.

3、</p><p>　　Dump Truck from the early 20th century there has been continuous development and perfection, has become the main vehicle of transport of goods. Dump Truck unloading a high degree of mobility and me

4、chanization a bit, usually with shovel loaders, excavators, or belt conveyors and other ancillary use to achieve loading and unloading mechanization, which can greatly shorten the handling time and improve transport effi

5、ciency and save labor, reduce labor strength. As the car manufacturing industry, Du</p><p>　　First, the status of technology development at home and abroad </p><p>　　1. Humanization </p>

6、<p>　　Further improve vehicle safety, vehicle safety, including performance, braking performance is further enhanced convenience and driver control, comfort is the car at home and abroad reflect the requirements o

7、f human development, which is reflected in the body, chassis and other aspects . </p><p>　　1. Suspension System </p><p>　　Foreign high-end Dump Truck, such as SCANIA, VOLVO, etc., air suspension

8、 with automatic adjustment, and basic domestic or leaf spring, a better use of the rubber suspension. </p><p>　　1. Transmission System </p><p>　　Main Foreign is automatic transmission. China mai

9、nly with manual gearbox, there are some manufacturers began to try to configure the chassis automatic transmission. </p><p>　　1. Braking Systems </p><p>　　Electric control system mainly foreign

10、(ECBS) and air disc brakes and ABS electronic control system installed. China mainly uses drum brakes, ABS, electronic brake system installed in the smaller, but also began developing the disc brake manufacturers.</p&

11、gt;<p>　　(4)Body Systems </p><p>　　Dump Truck body of domestic comfort than the gap in Europe is still a great car. But high-end cab, driving and ride comfort has been greatly improved than before.<

12、;/p><p>　　2. Specialization </p><p>　　Exclusive of foreign Dump Truck classification is increasingly apparent. In addition to general engineering of Dump Truck, but also according to the needs and

13、purposes century, the development of a dedicated is Dump Truck. </p><p>　　(1)Road salt cleaning truck </p><p>　　Of snow, snow days will be transported to the road salt, snow on the road sweeping

14、, snow spraying of salt. </p><p>　　(2) Class of fluid transport truck pollution </p><p>　　Achieve pollution class fluid collection, transportation and dumping, can better protect the vehicle cha

15、ssis, suitable for road paving and construction of the gravel material transport. </p><p>　　China Dump Truck of professional classification is not very clear that the Dump Truck currently mainly used in cons

16、truction, mining, coal transportation, and its degree of specialization than the foreign classification there a larger gap. </p><p>　　3. Structure Optimization </p><p>　　European high-strength s

17、teel materials often used Dump Truck or a U-shaped carriage frame structure, the advantages are: light weight, great load, more payload can be loaded indirectly increase the loading efficiency; reduce fuel consumption, l

18、ow center of gravity, good stability , lifting more goods at the time the play, easy to discharge; integral bearing, no or only a few ribs, a small amount of welding; more modern design, the outer surface of a large flat

19、, easy to paste advertisements, or o</p><p>　　For cost and processing considerations, the domestic truck still ordinary steel, steel plate as the main material. </p><p>　　4. Environmental protec

20、tion </p><p>　　As the world's growing environmental protection, national environmental protection requirements on the vehicles are more stringent. Dump Truck load of goods sealing requirements increasing

21、. </p><p>　　Automotive engine technology represents a country's industrial level. Developed countries in Europe to Euro V vehicle emissions standards, and requirements of the domestic truck is currently

22、the country Ⅲ standard, domestic and foreign well as very large gap, and reduce vehicle emissions of key technologies are only few the hands of countries, China still has great technical follow up and development process

23、. Further enhance the environmental protection requirements, sealing requirements of the </p><p>　　Second, the main structure and function </p><p>　　Dump Truck chassis and coat by the two major

24、components, two types of chassis they use a stereotypical car chassis. Dump Truck as a shorter wheelbase than the average, the prices require higher strength and stiffness, so characteristic for the Dump Truck, Dump Truc

25、k chassis are often designed to be specific. Tipper tops, including cars, subframe, hydraulic lift dump bodies, electrical are systems. </p><p>　　Dump Truck lifting mechanism is the core of the Dump Truck ju

26、dge the merits of the primary indicators. </p><p>　　Lifting mechanism of the type currently common are: F-type lifting mechanism to enlarge tripod, T-style tripod zoom lifting mechanism, lift cylinder, front

27、 roof lift and double roll. </p><p>　　Dump Truck engine, chassis and cab of the truck are the same structure and general. </p><p>　　Points after Dump Truck of the car to rollover and side tippin

28、g two, by manipulating the system control rod movement, the more common after the tipping, tipping push rod to make car, a small number of two-way is tipping. </p><p>　　Distribution of high-pressure oil thro

29、ugh the valve, tubing into the lift cylinder, front-end with the cab car is safety board. </p><p>　　The engine through the transmission, PTO driven hydraulic pump unit, hydraulic tipping body compartments fr

30、om the fuel tank, hydraulic pumps, distribution valves, lifting hydraulic cylinders, control valves and tubing and other components. </p><p>　　Hydraulic tipping body is compartments from the fuel tank, hydra

31、ulic pumps, distribution valves, lifting hydraulic cylinders, control valves and tubing and other components. </p><p>　　The engine through the transmission, PTO driven hydraulic pump unit, distribution valve

32、s for high pressure oil through the tubing into the lifting cylinder, push rod to make car rollover. More common after the rollover, by manipulating the system control rod movement, can stop the train tilted in any desir

33、ed position. Compartments use of their owner gravity and hydraulic control reset. </p><p>　　Tripod enlarge Lifting Mechanism is currently the most widely used way of lifting for 8 to 40 tons of load compartm

34、ent length of 4.4 to 6 meters. Structural advantages of mature, stable lifting and low cost; drawback to the main frame on the floor inside is the closed height of the larger plane. </p><p>　　Most of lift cy

35、linder form of Dump Truck used in the 6X4 on the bridge in front of each side of the second installation of a multi-cylinder (generally 3 to 4), the hydraulic cylinder directly on the pivot point on the compartment floor

36、. Twin advantages of lifting the main frame for the compartment floor and a high degree of closure on the smaller plane; disadvantage is that the hydraulic system is difficult to ensure synchronization of two hydraulic c

37、ylinders and held steady and poor students, t</p><p>　　Way before the top lift of simple structure, with the main frame on the floor inside the closed surface height can be very small, vehicle stability, low

38、 pressure hydraulic system, but the first big trip at the most-cylinder, high cost. </p><p>　　Double roll force cylinders good, travel less, achieve double roll; but more complex hydraulic piping, give stude

39、nts a higher incidence of rollover accidents. </p><p>　　Dump Truck with the development and improvement of domestic purchasing power, Dump Truck is not in the traditional sense of what life can be dry univer

40、sal truck, from the design point of view but also according to different goods, different conditions, different is regions developed different products. This requires the user to purchase vehicles to the manufacturer for

41、 specific use. </p><p>　　1. Chassis </p><p>　　In the choice of chassis, generally is based on economic benefits to consider, such as: the price of the chassis, loading quality, overload capacity

42、, fuel consumption per hundred kilometers, road maintenance and so on. In addition, the user must also consider the chassis of the following parameters: </p><p>　?、貶eight of the chassis frame on the plane. G

43、eneral 6x4 chassis frame height of the upper surface of 1050 to 1200. The higher the number the greater the vehicle center of gravity, the more easily cause an overturn. The main factors affecting the value of the tire d

44、iameter, suspension layout and the main frame is cross-section height. </p><p>　?、贑hassis rear overhang. The number of Dump Trucks moves through the General Assembly, growth stability, gives students a rollo

45、ver accident caused. This value is generally between 500-1100 (except Dump Truck roll). </p><p>　　③Vehicle matching rational use and reliable. </p><p>　　1. Upload </p><p>　　Currentl

46、y converted Dump Truck manufacturers was mixed, select the Dump Truck manufacturers over the selection of choice products are equally important. In addition to looking products, but also understand the capabilities of eq

47、uipment manufacturers, Dump Truck tops the design, technology and equipment is mature, service commitments, it can buy other accessories. </p><p>　　Third, the lifting mechanism of choice: </p><p&g

48、t;　　1. Recommended to choose a tripod for general use zoom-type Dump Truck lifting mechanism, the structure in China has a 40-year history, technology is relatively mature, suitable for carriage 4 to 6 meters in length D

49、ump Truck. </p><p>　　2. Reasonable arrangement, the parts Shouli Bu exceed the capacity of components, system hydraulic smaller, in order to ensure the seal life. </p><p>　　3. The choice of qual

50、ity hydraulic cylinders. Lifting hydraulic cylinder is the power unit, try to choose a quality assurance products, such as: blue post card hydraulic cylinder, the manufacturers promised lifetime warranty. </p><

51、;p>　　4. Compartment of the truck longer than 6 meters generally used in multi-cylinder front-top lifting structure. </p><p>　　5. Cylinder lifting structure is generally used with a wheelbase of the truck

52、3 to 4 meters. </p><p>　　Fourth, selection issues to the attention of </p><p>　　1. Transport large items must be selected inside the bucket. </p><p>　　2. Car is longer than 5.4 mete

53、rs to pay special attention when the cars center of gravity and lifting stability. </p><p>　　3. Can not be transported by special vehicles to transport coal earth. Private car coal train general height of 1.

54、6 ~ 1.9 m, length how the design of these vehicles is based on light goods (weight less than 1.2) to consider, for transporting earth and stone lifting may have poor stability, which seriously may lead to lifting a rollo

55、ver accident. </p><p>　　4. Do not use the bucket car transporting silt, clay and other sticky goods, the structure of the bucket carriage of goods more difficult to remove the sticky. </p><p>　　

56、5. Transport iron ore in the Dump Truck manufacturers to keep up when the statement selection, selection of the best choice for iron ore carrier. </p><p>　　6. For the transportation of asphalt paving, the li

57、fting mechanism requires slow down device. </p><p>　　Fifth, use and maintenance of Dump Truck </p><p>　　How several common errors: </p><p>　　1. Engine running, take power in the &qu

58、ot;on", lift the handle in the "lift" and Meng lift the clutch. Since leaving the sudden engagement PTO, oil pump and oil pump drive shaft causes a lot of impact load, could easily lead to early damage (us

59、ually occurred as the oil pump drive shaft damage.) High-speed operation in the engine compartment fully loaded, cold winter with high viscosity hydraulic oil under even more prominent.</p><p>　　2. In the mi

60、ddle of a sudden the elevator full of lifting the handle into the "down position", when the car was not touched down, but suddenly rushed down, this will bring great impact frame, and even accidents. Although t

61、he single-acting hydraulic cylinder piston set a throttling device to ensure that the decline in the car before the end of the throttling effect have landed on the car speed is automatically slowed down, but the cars ful

62、l effect has been obvious, therefore, should try to avoid </p><p>　　3. Xiewan goods, do not forget to disengage the power take off, or disengage the power take off will be driving, so the car is moving, due

63、to take power in the "engagement" position, the lift pump in the "small cycles" state No load speed for a long time operation. The so-called "small cycles" when running the oil pump oil pump

64、 hydraulic oil only in the high and low voltage circuit between the loop. In this case the hydraulic oil temperature rises quickly, easily lead to damage to pump seals, or</p><p>　　4. By Meng mention car - b

65、rake suddenly unloading. Meng mentioned as the inertial force of a great car (usually the rated lifting force of 5 to 20 times), can easily cause permanent deformation of the frame, open frame car and pay for welding, bu

66、rning or destruction of oil pump seal, hydraulic cylinders and other damage damage , reduces the life of the vehicle, serious rollover accidents also occur. Therefore, when lifting the general ban truck traffic. </p&g

67、t;<p>　　5. Driving power take off in the "ON" position: If "on" state (red light), the pump will continue to rotate, there is power source of the hydraulic system, which would control valve bec

68、ause the gas control misoperation caused by cars on the auto-lifting; time distribution of air control valve even in the "down" position, the oil should enter the pump, it would pump burned out. </p><

69、;p>　　6. Moving to lift the handle placed in the "stop" position: At this point the hydraulic system in a closed state, the impact of the ground while driving through the lifting mechanism can be passed to ca

70、rs , some connected parts are easily damaged. So when driving down the handles is put some "down" position. </p><p>　　7. In a great venue for cross slope of discharge: trunk askew when lifting, car

71、 flip axis may produce permanent deformation may occur more serious when it overturned. </p><p>　　8. Goods have not been fully discharged when the use of safety rod may result in accidents, the safety pole i

72、nspection and maintenance is only used for carriages. </p><p><b>　　自卸汽車(chē)</b></p><p>　　自卸汽車(chē)是指以運(yùn)送貨物為主且有傾卸貨廂的汽車(chē)，又稱翻斗車(chē)。</p><p>　　自卸汽車(chē)的特點(diǎn)是其車(chē)廂可以傾斜一定的角度，使車(chē)廂內(nèi)的貨物卸出。車(chē)廂的傾斜是以自卸汽車(chē)發(fā)動(dòng)機(jī)

73、的動(dòng)力，通過(guò)傾卸機(jī)構(gòu)來(lái)完成的。</p><p>　　自卸汽車(chē)自20世紀(jì)初出現(xiàn)以來(lái)，不斷發(fā)展，日趨完善，已成為當(dāng)今貨物運(yùn)輸?shù)闹饕?chē)輛之一。自卸汽車(chē)具有高度機(jī)動(dòng)性和卸貨機(jī)械化等有點(diǎn)，通常與鏟式裝載機(jī)、挖掘機(jī)或皮帶運(yùn)輸機(jī)等配套使用，實(shí)現(xiàn)裝卸機(jī)械化，從而可以大大縮短裝卸時(shí)間，提高運(yùn)輸效率并可節(jié)省勞動(dòng)力，減輕勞動(dòng)強(qiáng)度。隨著汽車(chē)制造業(yè)的發(fā)展，自卸汽車(chē)不斷采用新材料、新工藝，提高其質(zhì)量利用系數(shù)，具有較大的速度范圍和較高的傳動(dòng)效

74、率，控制與操縱更完善，更方便。</p><p>　　一、 國(guó)內(nèi)外技術(shù)發(fā)展現(xiàn)狀</p><p><b>　　1. 人性化</b></p><p>　　進(jìn)一步提高整車(chē)的安全性，包括車(chē)身安全性能、制動(dòng)性能進(jìn)一步提高，以及駕駛員操縱便利性、乘坐舒適性是目前國(guó)內(nèi)外汽車(chē)發(fā)展人性化要求的體現(xiàn)，這表現(xiàn)在車(chē)身、底盤(pán)等各個(gè)方面。</p><p&

75、gt;<b>　　（1）懸架系統(tǒng)</b></p><p>　　國(guó)外高檔自卸汽車(chē)如SCANIA、VOLVO等，均采用自動(dòng)調(diào)節(jié)的空氣懸架，而國(guó)內(nèi)基本還是鋼板彈簧，比較好的采用的是橡膠懸架。</p><p><b>　?。?）變速系統(tǒng)</b></p><p>　　國(guó)外主要采用自動(dòng)變速箱。國(guó)內(nèi)主要還是采用手動(dòng)變速箱，也有部分廠家開(kāi)

76、始試用自動(dòng)變速箱來(lái)配置汽車(chē)底盤(pán)。</p><p><b>　?。?）制動(dòng)系統(tǒng)</b></p><p>　　國(guó)外主要采用電控制系統(tǒng)(ECBS)與氣壓盤(pán)式制動(dòng)器，并加裝ABS等電子調(diào)節(jié)系統(tǒng)。國(guó)內(nèi)主要還是采用鼓式制動(dòng)，加裝ABS等電子制動(dòng)系統(tǒng)的較少，也有廠家開(kāi)始開(kāi)發(fā)盤(pán)式制動(dòng)。</p><p><b>　?。?）車(chē)身系統(tǒng)</b>&

77、lt;/p><p>　　國(guó)內(nèi)自卸汽車(chē)的車(chē)身舒適性較歐洲車(chē)的差距還是很大的。不過(guò)高檔駕駛室，駕駛和乘坐舒適性較以前有了很大的提高。</p><p><b>　　2.專(zhuān)用化</b></p><p>　　國(guó)外自卸汽車(chē)的專(zhuān)用化分類(lèi)越來(lái)越明顯。除了普通的工程用自卸汽車(chē)外，還 根據(jù)世紀(jì)的需求和用途，開(kāi)發(fā)了專(zhuān)用自卸汽車(chē)。</p><p>

78、;　?。?）公路撒鹽清掃自卸車(chē)</p><p>　　下雪天將化雪鹽運(yùn)輸至公路上，清掃道路上的積雪，灑布化雪鹽。</p><p>　?。?）污染類(lèi)流體運(yùn)輸自卸車(chē)</p><p>　　實(shí)現(xiàn)污染類(lèi)流體的收集、運(yùn)輸和傾卸，可以更好地保護(hù)汽車(chē)底盤(pán)，適用于道路鋪設(shè)及工程施工的沙石材料運(yùn)輸。</p><p>　　國(guó)內(nèi)自卸汽車(chē)的專(zhuān)業(yè)化分類(lèi)不是很明顯，目前國(guó)內(nèi)

79、的自卸汽車(chē)主要還是用于工程建設(shè)、礦山開(kāi)采、煤炭運(yùn)輸?shù)?，其?zhuān)業(yè)化分類(lèi)程度較國(guó)外還有較大的差距。</p><p><b>　　3.結(jié)構(gòu)優(yōu)化</b></p><p>　　歐洲高強(qiáng)鋼材料自卸車(chē)常選用U形或框架式車(chē)廂結(jié)構(gòu)，其優(yōu)點(diǎn)主要有：自重輕、載重大、能裝載更多的有效載荷、間接提高了裝載效率；降低油耗、重心低、穩(wěn)定性好、舉升時(shí)貨物更易劇中、便于卸貨；整體式承載，沒(méi)有或只有很少的

80、加強(qiáng)筋，焊接量?。煌庥^設(shè)計(jì)較為現(xiàn)代化，外表面有大的平面，便于粘貼廣告或其它圖案。歐洲專(zhuān)用車(chē)上非常廣泛地采用塑料制作的工具箱、擋泥罩。塑料材料具有一定的韌性、耐低溫和抗沖擊性能，不易脆裂，同時(shí)質(zhì)量輕、造型美觀，在輕量化的進(jìn)程中發(fā)揮著重要的作用。</p><p>　　國(guó)內(nèi)也有一部分廠家技術(shù)水平較高，通過(guò)結(jié)構(gòu)的變化降低自重，而且不降低車(chē)廂性能，主要是采用了框架式車(chē)廂結(jié)構(gòu)。</p><p>　　出

81、于成本和加工工藝方面考慮，國(guó)內(nèi)的自卸車(chē)仍然以普通鋼材、鋼板為主要材料。</p><p><b>　　4.環(huán)保性</b></p><p>　　隨著整個(gè)世界對(duì)環(huán)境保護(hù)的日益加強(qiáng)，各國(guó)對(duì)車(chē)輛的環(huán)保性要求也越來(lái)越嚴(yán)格。自卸汽車(chē)裝載貨物的密封性要求也越來(lái)越受重視。</p><p>　　汽車(chē)發(fā)動(dòng)機(jī)技術(shù)代表了一個(gè)國(guó)家的工業(yè)水平。歐洲發(fā)達(dá)國(guó)家的汽車(chē)尾氣排放達(dá)到

82、歐V的標(biāo)準(zhǔn)，而國(guó)內(nèi)卡車(chē)的要求目前是國(guó)Ⅲ標(biāo)準(zhǔn)，國(guó)內(nèi)與國(guó)外還有非常大的差距，而且，降低汽車(chē)排放的關(guān)鍵技術(shù)只被為數(shù)不多的幾個(gè)國(guó)家所掌握，中國(guó)還有很大的技術(shù)跟進(jìn)及發(fā)展過(guò)程。環(huán)保要求的進(jìn)一步提高，對(duì)自卸汽車(chē)的密封性要求也提到了日程，國(guó)內(nèi)外均采用了多種方法來(lái)防止自卸汽車(chē)的貨物撒落。國(guó)外自卸汽車(chē)的專(zhuān)業(yè)化分類(lèi)也有利于保護(hù)環(huán)境，如污染類(lèi)流體運(yùn)輸自卸車(chē)的開(kāi)發(fā)和使用，但大多數(shù)福哦家主要采用了自卸汽車(chē)車(chē)廂加蓋的方式。自卸汽車(chē)的密封蓋主要有兩種：一種為篷布軟蓋，

83、一種為金屬硬蓋。因此，國(guó)外的車(chē)輛使用一般不超載，貨物基本不超出車(chē)廂的上沿。而國(guó)內(nèi)的自卸汽車(chē)則兩種都有，城市環(huán)保要求高的多數(shù)采用金屬蓋，密封性較好，但成本高；環(huán)保要求較低的多數(shù)采用軟蓋，密封性差一些，但成本低。</p><p>　　二、 主要結(jié)構(gòu)及功能</p><p>　　自卸汽車(chē)由汽車(chē)底盤(pán)和上裝兩大部分組成，底盤(pán)大多采用定型汽車(chē)二類(lèi)底盤(pán)。由于自卸車(chē)軸距比一般貨車(chē)要短，車(chē)價(jià)要求有較高的強(qiáng)度和

84、剛度，所以針對(duì)自卸車(chē)特點(diǎn)，往往設(shè)計(jì)成專(zhuān)用自卸車(chē)底盤(pán)。自卸車(chē)上裝包括車(chē)廂、副車(chē)架、液壓舉升傾卸機(jī)構(gòu)、電氣系統(tǒng)等。</p><p>　　舉升機(jī)構(gòu)是自卸車(chē)的核心，是判別自卸車(chē)優(yōu)劣的首要指標(biāo)。 </p><p>　　舉升機(jī)構(gòu)的型式目前國(guó)內(nèi)常見(jiàn)的有：F式三角架放大舉升機(jī)構(gòu)、T式三角架放大舉升機(jī)構(gòu)、雙缸舉升、前頂舉升和雙面?zhèn)确?lt;/p><p>　　自卸車(chē)的發(fā)動(dòng)機(jī)、底盤(pán)及駕駛室

85、的構(gòu)造和一般載重汽車(chē)相同。 </p><p>　　自卸車(chē)的車(chē)廂分后向傾翻和側(cè)向傾翻兩種，通過(guò)操縱系統(tǒng)控制活塞桿運(yùn)動(dòng)，后向傾翻較普遍，推動(dòng)活塞桿使車(chē)廂傾翻，少數(shù)雙向傾翻。 </p><p>　　高壓油經(jīng)分配閥、油管進(jìn)入舉升液壓缸，車(chē)廂前端有駕駛室安全防護(hù)板。</p><p>　　發(fā)動(dòng)機(jī)通過(guò)變速器、取力裝置驅(qū)動(dòng)液壓泵，車(chē)廂液壓傾翻機(jī)構(gòu)由油箱、液壓泵、分配閥、舉升液壓缸、

86、控制閥和油管等組成。 </p><p>　　車(chē)廂液壓傾翻機(jī)構(gòu)由油箱、液壓泵、分配閥、舉升液壓缸、控制閥和油管等組成。 </p><p>　　發(fā)動(dòng)機(jī)通過(guò)變速器、取力裝置驅(qū)動(dòng)液壓泵，高壓油經(jīng)分配閥、油管進(jìn)入舉升液壓缸，推動(dòng)活塞桿使車(chē)廂傾翻。以后向傾翻較普遍，通過(guò)操縱系統(tǒng)控制活塞桿運(yùn)動(dòng)，可使車(chē)廂停止在任何需要的傾斜位置上。車(chē)廂利用自身重力和液壓控制復(fù)位。</p><p>

87、　　三角架放大式舉升機(jī)構(gòu)是目前國(guó)內(nèi)使用最多的一種舉升方式，適用載重量8~40噸，車(chē)廂長(zhǎng)度4.4~6米。優(yōu)點(diǎn)為結(jié)構(gòu)成熟、舉升平穩(wěn)、造價(jià)低；缺點(diǎn)為車(chē)廂底板與主車(chē)架上平面的閉合高度較大。 </p><p>　　雙缸舉升形式大多用在6X4自卸車(chē)上，是在第二橋前方兩側(cè)各安裝一支多級(jí)缸（一般為3~4級(jí)），液壓缸上支點(diǎn)直接作用在車(chē)廂底板上。雙缸舉升的優(yōu)點(diǎn)為車(chē)廂底板與主車(chē)架上平面的閉合高度較??；缺點(diǎn)是液壓系統(tǒng)很難保證兩液壓缸同步

88、，舉生平穩(wěn)性較差，對(duì)車(chē)廂底板的整體剛度要求較高。 </p><p>　　前頂舉升方式結(jié)構(gòu)簡(jiǎn)單、車(chē)廂底板與主車(chē)架上平面的閉合高度可以很小，整車(chē)穩(wěn)定性好，液壓系統(tǒng)壓力較小，但前頂多級(jí)缸行程較大，造價(jià)很高。 </p><p>　　雙面?zhèn)确簤焊资芰^好，行程較小，可實(shí)現(xiàn)雙面?zhèn)确?；但液壓管路較復(fù)雜，舉生翻車(chē)事故發(fā)生率較高。</p><p>　　隨著自卸汽車(chē)的發(fā)展和國(guó)內(nèi)購(gòu)買(mǎi)能

89、力的提高，自卸車(chē)已經(jīng)不是傳統(tǒng)意義上的什么活都可以干的萬(wàn)能自卸車(chē)，從設(shè)計(jì)角度講也是按不同的貨物、不同工況、不同地區(qū)開(kāi)發(fā)不同的產(chǎn)品。這就要求用戶在購(gòu)買(mǎi)車(chē)輛時(shí)要向廠家提供具體使用情況。</p><p><b>　　1．底盤(pán)</b></p><p>　　在選擇底盤(pán)時(shí)，一般是按經(jīng)濟(jì)效益來(lái)考慮的，比如：底盤(pán)的價(jià)格、裝載質(zhì)量、超載能力、百公里油耗、養(yǎng)路費(fèi)等。除此之外，用戶還要考慮底

90、盤(pán)的如下參數(shù)： </p><p>　?、?底盤(pán)車(chē)架上平面離地高度。一般6x4底盤(pán)車(chē)架上平面離地高度為1050~1200。該數(shù)值越大整車(chē)重心越高，越容易造成翻車(chē)。影響該數(shù)值的因素主要是輪胎直徑、懸掛的布置和主車(chē)架截面高度。 </p><p>　?、?底盤(pán)后懸。該數(shù)值過(guò)大會(huì)影響自卸車(chē)舉生穩(wěn)定性，造成舉生翻車(chē)事故。此數(shù)值一般在500-1100之間（側(cè)翻自卸車(chē)除外）。 </p>&l

91、t;p>　　③ 整車(chē)匹配合理、使用可靠。 </p><p><b>　　2．上裝</b></p><p>　　目前自卸車(chē)改裝廠家魚(yú)龍混雜，選擇自卸車(chē)時(shí)選擇廠家比選擇產(chǎn)品同樣重要。除看產(chǎn)品外，還要了解廠家的設(shè)備能力、自卸車(chē)上裝的設(shè)計(jì)、工藝裝備是否成熟、售后服務(wù)承諾、配件是否能買(mǎi)到等。</p><p>　　三、 舉升機(jī)構(gòu)的選擇： </p

92、><p>　　1.一般用途自卸車(chē)建議選擇三角架放大式舉升機(jī)構(gòu)，該結(jié)構(gòu)在我國(guó)已有40年歷史，技術(shù)比較成熟，適合車(chē)廂長(zhǎng)度4~6米的自卸車(chē)。 </p><p>　　2．合理布置，各零部件受力不會(huì)超過(guò)零部件的承受能力，系統(tǒng)油壓較小，以保證各密封件的使用壽命。 </p><p>　　3.選擇優(yōu)質(zhì)液壓缸。液壓缸是自卸車(chē)舉升的動(dòng)力部件，盡量選擇有質(zhì)量保證的產(chǎn)品，比如：青專(zhuān)牌液壓缸，廠

93、家承諾終身保修。 </p><p>　　4.車(chē)廂長(zhǎng)度大于6米的自卸車(chē)一般選用多級(jí)缸前頂式舉升結(jié)構(gòu)。 </p><p>　　5.雙缸舉升結(jié)構(gòu)一般用于軸距為3~4米的自卸車(chē)。 </p><p>　　四、 選型時(shí)要注意的問(wèn)題</p><p>　　1.運(yùn)輸大塊物品必須選用鏟斗車(chē)廂。 </p><p>　　2.車(chē)廂長(zhǎng)度大于5.4

94、米時(shí)要特別注意車(chē)廂重心高度和舉升穩(wěn)定性。 </p><p>　　3.不能用運(yùn)煤專(zhuān)用車(chē)運(yùn)送土石方。一般運(yùn)煤專(zhuān)用車(chē)的車(chē)廂高度在1.6-1.9米，長(zhǎng)度如何這類(lèi)車(chē)輛設(shè)計(jì)時(shí)是按輕質(zhì)貨物（比重小于1.2）考慮的，用于運(yùn)送土石方時(shí)可能有舉升穩(wěn)定性差的問(wèn)題，嚴(yán)重者可引起舉升翻車(chē)事故。 </p><p>　　4.不要用鏟斗車(chē)廂運(yùn)送淤泥、粘土等粘稠貨物，鏟斗車(chē)廂的結(jié)構(gòu)使粘稠貨物更不容易卸下。 </p&g

95、t;<p>　　5.運(yùn)輸鐵礦粉的自卸車(chē)選型時(shí)要跟廠家聲明，最好選擇鐵礦粉選用運(yùn)輸車(chē)。 </p><p>　　6.用于鋪路瀝青運(yùn)輸時(shí)，舉升機(jī)構(gòu)要求有慢降裝置。 </p><p>　　五、 自卸車(chē)使用和維護(hù)</p><p>　　常見(jiàn)的幾種錯(cuò)誤操作方法： </p><p>　　1.發(fā)動(dòng)機(jī)運(yùn)轉(zhuǎn)，取力器位于“接通”，升降手柄位于“舉升”而

96、猛抬離合器。由于突然的接合而使取力器、油泵傳動(dòng)軸及油泵引起很大的沖擊載荷，易造成早期損壞（一般多發(fā)生為油泵傳動(dòng)軸損壞）。在發(fā)動(dòng)機(jī)高速運(yùn)轉(zhuǎn)，車(chē)廂滿載，冬季寒冷液壓油粘度高的情況下更為突出。 </p><p>　　2.在滿載舉升中途突然將升降手柄推向“下降位置”，這時(shí)車(chē)廂不是徐徐降落，而是猛然沖下，這會(huì)給車(chē)架帶來(lái)很大的沖擊力，甚至?xí)l(fā)生意外事故。盡管單作用活塞式液壓缸設(shè)置有節(jié)流裝置，以保證在車(chē)廂下降終了前產(chǎn)生節(jié)流作用

97、使車(chē)廂降落速度自動(dòng)減慢，但對(duì)于滿載的車(chē)廂效果已不明顯，因此，應(yīng)盡量避免上述操作，如有特殊情況需要也必須小心操作，盡量放慢降落速度，必須切忌勿猛然將車(chē)廂落到底。 </p><p>　　3.卸完貨后，不脫開(kāi)取力器或忘記脫開(kāi)取力器便行車(chē)，這樣汽車(chē)在行駛時(shí)，由于取力器處于“接合”位置，舉升油泵則在“小循環(huán)”狀態(tài)下高速長(zhǎng)時(shí)間無(wú)負(fù)荷運(yùn)轉(zhuǎn)。所謂“小循環(huán)”即油泵運(yùn)轉(zhuǎn)時(shí)液壓油只在油泵高、低壓回路之間循環(huán)。這種情況下液壓油油溫上升很

98、快，易造成油泵油封的損壞，甚至發(fā)生油泵“燒死”的現(xiàn)象； 另外在高速行車(chē)時(shí)，油泵傳動(dòng)軸也會(huì)在過(guò)高的離心力作用下導(dǎo)致早期損壞。更嚴(yán)重的是油泵的運(yùn)轉(zhuǎn)意味著液壓系統(tǒng)有動(dòng)力源， 在行車(chē)過(guò)程中會(huì)因各種原因而出現(xiàn)車(chē)廂自動(dòng)升起的事故。 因此，在卸完貨行車(chē)時(shí)，必須及時(shí)脫開(kāi)并確認(rèn)取力器已經(jīng)脫開(kāi)再使車(chē)輛行駛。 </p><p>　　4.利用猛提車(chē)—猛剎車(chē)卸貨。由于猛提車(chē)的慣性力很大（一般是額定舉升力的5~20倍），極易造成車(chē)架永久變形

99、、車(chē)廂和付車(chē)架開(kāi)焊、燒油泵或破壞密封圈、破壞液壓缸等損害，車(chē)輛的使用壽命降低，嚴(yán)重者還會(huì)出現(xiàn)翻車(chē)事故。所以一般自卸車(chē)禁止舉升時(shí)行車(chē)。 </p><p>　　5.行駛時(shí)取力器在"接通"位置：若在"接通"狀態(tài)(紅燈亮著)，則油泵將繼續(xù)轉(zhuǎn) 動(dòng)，液壓系統(tǒng)就有動(dòng)力源，這樣就會(huì)因?yàn)樵跉饪夭倏v閥上的誤操作而引起車(chē)廂自動(dòng)舉升； 此時(shí)氣控分配閥即使在"下降"位置，油也

100、要進(jìn)入油泵，這樣會(huì)使油泵燒壞。 </p><p>　　6.行駛時(shí)將升降手柄置于“中?！蔽恢茫捍藭r(shí)液壓系統(tǒng)處于封閉狀態(tài)，行車(chē)時(shí)地面的沖擊可以通過(guò)舉升機(jī)構(gòu)傳遞到車(chē)廂，極易損壞某些聯(lián)結(jié)部件。所以行駛時(shí)一定要將升降手柄置于“下降”位置。 </p><p>　　7.在有很大橫向坡度的場(chǎng)地卸貨：舉升時(shí)車(chē)箱歪斜，車(chē)廂翻轉(zhuǎn)軸可能產(chǎn)生永久變形，更嚴(yán)重者可能發(fā)生翻車(chē)時(shí)故。 </p><p&