挖掘機工作裝置研究及液壓泵設計【反鏟工作裝置】【直軸式軸向柱塞泵的設計】

挖掘機工作裝置研究及液壓泵設計【反鏟工作裝置】【直軸式軸向柱塞泵的設計】,反鏟工作裝置,直軸式軸向柱塞泵的設計,挖掘機工作裝置研究及液壓泵設計【反鏟工作裝置】【直軸式軸向柱塞泵的設計】,挖掘機,工作,裝置,研究,鉆研,液壓泵,設計,直軸式,軸向,柱塞 第八章 直軸式軸向柱塞泵關鍵零部件的受力分析 8.1柱塞受力分析 柱塞是柱塞泵主要受力零件之一。單個柱塞隨缸體旋轉一周時，半周吸油﹑一周排油。柱塞在吸油過程與在排油過程中的受力情況是不一樣的。下面主要討論柱塞在排油過程中的受力分析，圖8.1是帶有滑靴的柱塞受力分析簡圖。 圖 8.1柱塞受力分析 作用在柱塞上的力有： （1）柱塞底部的液壓力 柱塞位于排油區(qū)時，作用于柱塞底部的軸向液壓力為 式中—泵最大工作壓力。 （2）柱塞慣性力 柱塞相對缸體往復直線運動時，有直線加速度a，則柱塞軸向慣性力為 式中﹑為柱塞和滑靴的總質量。 慣性力方向與加速度a的方向相反，隨缸體旋轉角a按余弦規(guī)律變化。當和時，慣性力最大值為 （3）離心反力 柱塞隨缸體繞主軸作等速圓周運動，有向心加速度，產(chǎn)生的離心反力通過柱塞質量重心并垂直軸線，是徑向力。其值為 （5-4） （4）斜盤反力 斜盤反力通過柱塞球頭中心垂直于斜盤平面，可以分解為軸向力P及徑向力 即 軸向力P與作用于柱塞底部的液壓力及其它軸向力相平衡。而徑向力T則對主軸形成負載扭矩，使柱塞受到彎矩作用，產(chǎn)生接觸應力，并使缸體產(chǎn)生傾倒力矩。 （5）柱塞與柱塞腔壁之間的接觸應力和 該力是接觸應力和產(chǎn)生的合力?？紤]到柱塞與柱塞腔的徑向間隙遠小于柱塞直徑及柱塞腔內(nèi)的接觸長度。因此，由垂直于柱塞腔的徑向力T和離心力引起的接觸應力和可以看成是連續(xù)直線分布的應力。 （6）摩擦力和 柱塞與柱塞腔壁之間的摩擦力為 式中 為摩擦系數(shù)，常取=0.05～0.12，這里取0.1。 分析柱塞受力，應取柱塞在柱塞腔中具有最小接觸長度，即柱塞處于上死點時的位置。此時，N﹑和可以通過如下方程組求得 式中 —柱塞最小接觸長度，根據(jù)經(jīng)驗=； —柱塞名義長度，根據(jù)經(jīng)驗=； —柱塞重心至球心距離，=- 。 以上雖有三個方程，但其中也是未知數(shù)，需要增加一個方程才能求解。 根據(jù)相似原理有 又有 所以 將式代入求解接觸長度。為簡化計算，力矩方程中離心力相對很小可以忽略，得 將式代入可得 計算得P1=20.1KN，P2=5823（N） 將以上兩式代入可得 8.2滑靴受力分析 液壓泵工作時，作用于滑靴上有一組方向相反的力。一是柱塞底部液壓力圖把滑靴壓向斜盤，稱為壓緊力；另一是由滑靴面直徑為的油池產(chǎn)生的靜壓力與滑靴封油帶上油液泄漏時油膜反力，二者力圖使滑靴與斜盤分離開，稱為分離。當壓緊力與分離力相平衡時，封油帶上將保持一層穩(wěn)定的油膜，形成靜壓油墊。下面對這組力進行分析。 (1)分離力 圖8.2為柱塞結構與分離力分布圖。根據(jù)流體學平面圓盤放射流動可知，油液經(jīng)滑靴封油帶環(huán)縫流動的泄漏量q的表達式為 若，則 式中為封油帶油膜厚度。 封油帶上半徑為的任儀點壓力分布式為 若，則 從上式可以看出，封油帶上壓力隨半徑增大而呈對數(shù)規(guī)律下降。封油帶上總的分離力可通過積分求得。 圖 8.2滑靴結構及分離力分布 如圖8.2，取微環(huán)面，則封油帶分離力為 油池靜壓分離力為 總分離力為 計算得Pf=60(KN) (2)壓緊力 滑靴所受壓緊力主要由柱塞底部液壓力引起的，即 (3)力平衡方程式 當滑靴受力平衡時，應滿足下列力平衡方程式 即 將上式代入式中，得泄漏量為 除了上述主要力之外，滑靴上還作用有其他的力。如滑靴與斜盤間的摩擦力，由滑靴質量引起的離心力，球鉸摩擦力，帶動滑靴沿斜盤旋轉的切向力等。這些力有的使滑靴產(chǎn)生自轉，有利于均勻摩擦；有的可能使滑靴傾倒而產(chǎn)生偏磨，并破壞了滑靴的密封。 8.3配油盤受力分析 不同類型的軸向柱塞泵使用的配油盤是有差別的，但是功用和基本構造則相同。圖8.3是常用的配油盤簡圖。 液壓泵工作時，高速旋轉的缸體與配油盤之間作用有一對方向相反的力；即缸體因柱塞腔中高壓油液作用而產(chǎn)生的壓緊力；配油窗口和封油帶油膜對缸體的分離力。 1—吸油窗 2—排油窗 3—過度區(qū) 4—減振槽 5—內(nèi)封油帶 6—外封油帶 7—輔助支承面 圖 8.3配油盤基本構造 （1）壓緊力 壓緊力是由于處在排油區(qū)是柱塞腔中高壓油液作用在柱塞腔底部臺階上，使缸體受到軸向作用力，并通過缸體作用到配油盤上。 對于奇數(shù)柱塞泵， 當有12(Z+1)個柱塞處于排油區(qū)時，壓緊力FY1=12Z+1π4dz2P=24150（N） 當有12(Z-1)個柱塞處于排油區(qū)時，壓緊力FY2=12Z-1π4dz2P=19320（N） 平均壓緊力FY=FY1+FY22=21735(N) （2）分離力 分離力由三部分組成。即外封油帶分離力FL1，內(nèi)封油帶分離力FL2，排油窗高壓油對缸體的分離力FL3。 對于奇數(shù)泵，在缸體旋轉過程中，每一瞬時參加排油的柱塞數(shù)量和位置不同。封油帶的包角是變化的。實際包角比配油盤油窗包角φ有所擴大， 當有12(Z+1)個柱塞排油時，封油帶實際包角φ1=12Z-1a+a0 當有12(Z-1)個柱塞排油時，封油帶實際包角φ2=12Z-3a+a0 平均有Z2個柱塞排油時，平均包角φ=φ1+φ22 式中 a----------柱塞間距角，a=2πZ=2π9； a0----------柱塞腔通油孔包角，這里取a0=2π9。 外封油帶分離力FL1=φ(R42-R32)4lnR4R3P-φ2R32P=3.4(N) 內(nèi)封油帶分離力FL2=φ(R22-R12)4lnR2R1P+φ2R12P=5.2(N) 排油窗分離力FL3=φ2（R32-R22）P=1.6(N) 配油盤總分離力FL=FL1+FL2+FL3=10.2(N) 8.4斜盤受力分析 直軸式軸向柱塞泵通過泵的變量機構改變斜盤傾斜角的大小來改變輸出流量。圖8.4為斜盤轉軸偏心結構。 下面就以偏心結構為例分析斜盤所受的各力矩。對于無偏心的結構只要令a或b為零，推導出的公式仍然適用。 圖 8.4斜盤轉軸偏心結構 在以下的分析中，規(guī)定使斜盤傾角減小的力矩為正，反之為負。本文采用帶卸荷槽非對稱正重迭型配油盤，設帶卸荷槽的配油盤過渡區(qū)壓力角為﹑，如圖8.5所示，那么 同理可得 =+=350（N.m） 圖 8.5 配油盤過渡區(qū)結構 回程盤中心預壓彈簧力矩 附 錄 1 英文原文 Hydraulic Excavators 1.Hydraulic Excavators picture 2. Basic Concept An excavator is an engineering vehicle consisting of an articulated arm (boom, stick), bucketand cab mounted on a pivot (a rotating platform) atop an undercarriage with tracks or wheels. Their design is a natural progression from the steam shovel. The history of heavy excavating machinery began in 1835 when the dipper shovel was invented to excavate hard soil and rock and to load trucks. Of course, with the invention ofgasoline-and diesel-powered vehicles, construction equipment became even more adaptable. Most construction equipment is powered by diesel engines, although electric-power, battery power, and propane tanks are used on specialized equipment. Design modifications are driven by customer demand. As of 2000, the two primary areas where customers would like to see more improvements are in the ease of operation and the operator's comfort. The need for simple operation is forced by the fact that there are fewer skilled operators in the marketplace. And operations and reliability are both improving because of the continuing integration of electronics, automation, better engine technology, and on-board diagnostics. It is now up to the manufacturers to cost-effectively incorporate improvements. 3. Applications 1 2 3 4 5 6 7 8 9 1. digging and loading 2. stonework 3. mining engineering 4. rock breaking 5. pipe laying 6. hoisting heavy object 7. clear up side slope 8. watercourse clearance 9. removal treatment 4. Components and Features 1）Overall Structure 1. diesel engine and hydraulic system 2.undercarriage 3. swing mechanism 4. work equipment assembly 5. steering andoperating system 2）Major Components Diesel Engine and Hydraulic System: 1. diesel engine 2. hydraulic pump Undercarriage: 1. main frame 2. track 3. track idler 4. track frame 5.final drive(driving motor and drive sprocket) Work Equipment Assembly: 1. bucket 2. bucket linkage 3. bucket cylinder 4. arm 5. arm cylinder 6. boom 7. hydraulic pipeline 8.boom cylinder 9. bucket lip General Purpose Bucket: 1.anti-torsion pipe fitted for increased strength 2.two piece side plates 3. wear straps fitted to increase base strength 4. cutting edge Steering and Operating System: 1. driver’s Seat 2. arm rest 3. joystick control 4. control pedal 5. travel lever 6. monitor 7. console 5. Typical Hydraulic System 1.hydraulic pump 2、4. distributing valve group 3. check valve 5. speed limit valve 6. hydraulic cylinder 7、8. traveling hydraulic Motor 9. double speed valve 10. slewing hydraulic motor 11. boom cylinder 12. auxiliary cylinder 13. arm cylinder 14. bucket cylinder 15. back pressure valve 16. oil cooler 17. oilfilter 6. Dimensions 1. Shipping Height 2. Shipping Length 3. Tail Swing Radius 4. Length to Center of Rollers 5. Track Length 6. Ground Clearance 7. Track Gauge 8. Transport Width 9. Cab Height 10. Counterweight Clearance 7. Working Ranges 1. Maximum Digging Depth 2. Maximum Reach at Ground Level 3. Maximum Cutting Height 4. Maximum Loading Height 5. Minimum Loading Height 6. Maximum Depth Cut for Level Bottom 7. Maximum Vertical Wall Digging Depth 8. Small Excavator Features 1. Mustang introduces a new bucket series with innovative design improvements that achieve greater bucket volumes, higher breakout forces and improved vertical digging. 2. Standard headlights mounted on the boom and at the front of the cab provide excellent nighttime visibility. 3. To help avoid damage and downtime, Mustang securely routes bucket cylinder hoses through the dipper stick. For faster attachment management and parts replacement, we connect boom and arm hoses on the outside of the machine. 4. Independent right and left boom swing, for offset digging. 5. Special digging situations call for specialized digging machines, which allow vertical digging even on slopes up to 15 degrees. 6. Mustang’s chassis includes edges reinforced with cast iron — nearly indestructible. This heavy-duty reinforced bumper protects components against accidental collisions. 9. New Technology of Typical Hydraulic Excavator 1）Introduction The Hitachi ZAXIS-3 series new-generation hydraulic excavators are packed with a host of technological features – clean engine, Hitachi advanced hydraulic technologies, with strong undercarriage and front attachment, plus well matching of power and speed. The ZAXIS-3 series can get the job done with proven productivity, durability, and reliability, especially in heavy-duty excavation and quarry operations. To yield high production yet maintain low fuel consumption, such was the objective of the development of a new engine and hydraulic system . 2）Advanced Hydraulic Technologies 1.Increased Digging Force 7% more bucket digging force and 8% more arm digging force. 2.Enhanced Boom Recirculation System In combined operation of boom lower and arm, arm speed can be increased by approximately 15% over the conventional. Pressurized oil from boom cylinder bottom side is delivered to boom cylinder rod side to lower the boom, assisted by boom weight. Conventionally, pressurised oil from pump is delivered to boom cylinder rod side to lower the boom. The new system also allows an efficient combined operation of swing and lowering the boom. 3. Boom Mode Selector The amount the body can be lifted or pulled by the front of machine can be ON or OFF selected. This helps to provide for more comfortable operation and contributes to longer component service life. 4. Larger-Diameter Front Piping Arm piping is increased in diameter to reduce hydraulic loss (theoretically 7%) for speedy front operation. 5. Combined Operation of Boom and Arm In combined operation of swing + boom lower + arm roll-out, or in leveling (boom lower + arm roll-out), arm roll-out speed can be increased greatly. Here’s why. A variable throttle, provided in the arm circuit, adjusts the flow when needed to reduce hydraulic loss in combined operation with arm roll-out. 6. New Bucket Regenerative System Swift bucket actions can be done in combined operation for excavation through the new bucket regenerative circuit. When the load to the bucket is light, pressurized oil from bucket cylinder rod side is delivered through a regenerative valve to bucket cylinder bottom side for the effective use of hydraulic energy. 10. Strengthened Undercarriage 1.Increased Loading Capacity of Swing Bearing The swing circle ball bearing ultilizes more balls to boost the loading capacity of the swing circle by approximately 6%, allowing stable swing even in tough operation. 2.Strengthened Track Links The boss diameter of each track link is increased by approximately 19%. The thickness of each track link is also increased by approximately 57%. Thickened track links extend service life. 3.Strengthened Upper Roller Bracket The upper roller bracket wall thickness is increased for higher strength. 4.Full Track Guard Provided Standard On the H-specification machines, full track guards are provided standard. Full track guards protect track links and lower rollers from damage and deformation. Moreover, they also keep out stones, preventing the overload to the undercarriage to reduce wear and damage. 5.Pressed Master Pins The master pin of each track link is pressed, instead of master pin using a pin retention to avoid disengagement. 6.Strengthened Idler Pedestal The bearing length of the idler pedestal is extended by approximately 67% to increase durability and service life. 7. Strengthened Idler Bracket The idler bracket is thickened for rigidity to prevent deformation and increase durability. 11. Strengthened Front Components 1. 5% Increase in Strength with Stronger Pin Material The strength of pins, used in the arm and boom, is increased by 5%, using harder steel material. 2.Strengthened General-Purpose Bucket Bucket teeth are reshaped as Super-V teeth for smooth penetration and higher production. Bushings are utilized at both ends of a bucket pin to eliminate clearances, preventing jerky operation. 3.Strengthened H-Bucket for Heavy-Duty The heavy-duty bucket is reshaped, and bucket parts are strengthened to increase durability. 12. Enhanced Operator Comfort The spacious cab is ergonomically designed with excellent visibility to reduce operator fatigue and burden. 1. Excellent Visibility The glass windows are widened for excellent visibility, especially improving right downward view during travel and excavation. 2. Ample Foot Space Foot space is expanded forward, and pedals are reshaped for pleasant operation. 3. Short-Stroke Levers Fingertip control of short-stoke levers, with the help of armrests, allows long, continuous operation with less fatigue（30% reduction in lever control effort）. 4. Comfort-Designed Operator The operator seat is ergonomically designed for long-hour pleasant operation. The seatback is widened to hold the operator securely, and the headrest is reshaped. The operator seat is strengthened to reduce vibration and shocks, and increase durability. 5. Fluid-Filled Elastic Mounts The cab rests on fluid-filled elastic mounts that absorb shocks and vibration to enhance operator comfort. 6. Large Multilanguage, Multi Function Monitor The large color LCD monitor, teamed up with the rear view camera (optional) on the counterweight, gives the operator unobstructed rearward view. This system enhances safety during swing and reversing. 13. Simplified Maintenance Focusing on simplified maintenance, including easy inspection, service and cleaning. 1. Simplified Cleaning around Engine The radiator and oil cooler are laid out in parallel arrangement for easy demounting, instead of conventional inline arrangement. This new arrangement significantly helps facilitate cleaning around the radiater and oil cooler. 2. Dual Main Fuel Filters Provided Standard In addition to a pre-filter, dual main fuel filters are provided standard to reduce clogging of the fuel line to the engine. 3. Easy Draining The engine oil pan is fitted with a drain coupler. When draining, an associated drain hose is connected to the drain coupler. Unlike a cock, the drain coupler is reliable, avoiding oil spills and vandalism. 4. Automatic Lubrication The front attachment is automatically lubricated, except for bucket lubricating points at the top of arm that are repositioned for side lubrication. 5. Extended Hydraulic Oil Filter Change Intervals Hydraulic oil filter change intervals are extended from 500 hours to 1000 hours to help reduce running costs. 14. Environmental Preservation Boarding a clean engine complying with the rigorous emission regulations. 1. Environmentally Friendly Designs The clean engine complying with the emission regulations Stage III in EU and Tier 3 in US (EPA) is boarded to reduce emissions containing nitrogen oxide (NOx) and particulate matter (PM). 2.Low Noise Engine Engine noise is reduced by approximately 2 dB with the robust engine. It goes without saying that the engine meets the EU noise regulations. 3.Variable-Speed Fan The engine cooling fan is a large 1120mm diameter variable-speed electro-hydraulic fan.This fan automatically starts when temperature comes into the high temperature range, ensuringlow noise operation. 4.Proven Muffler A proven large muffler is provided to reduce sound and exhaust emissions greatly. 5. Marking of Recyclable Parts All resin parts are marked for the sake of recycling. This helps ease the separation of recyclable wastes。 6.Reducing the Burden to the Environment Lead-free design is achieved through the use of lead-free wire harness covering, radiator, oil cooler and others. No asbestos is used. The use of aluminum radiator, oil cooler and intercooler increases the durability of the machine. 7.Biodegradable Hydraulic Oil Degradable hydraulic oil is ecological, which is decomposed into water and carbon dioxide in water and ground. 15. Enhanced Safety 1. CRES II Cab The CRES II cab is designed to help with “just in case” protection for the operator. Safety in case of tipping is improved. The cab top can withstand nine-fold loading. 2. H/R Cab The H/R cab utilizes the reinforced front window and FOPS at the roof for protection against falling objects. The front glass window, made of straight-laminated, is fixed to shut out dirt and debris. The cab provided with a full guard satisfies the OPG( Level II) cab requirements stipulated by ISO. 3.New Pilot Control Shut-Off Lever The engine cannot start unless the lock lever is locked completely. This prevents unintended rapid lurching by unintended touching a control lever. 2 中文翻譯 液壓挖掘機 1. 液壓挖掘機圖片 2. 基本概念 挖掘機是一種由鉸接臂桿（動臂和斗桿）、鏟斗和安裝于履帶或輪式底盤上的轉盤（一種旋轉平臺）所組成的工程機械（車輛）。挖掘機是在蒸汽鏟的基礎上自然發(fā)展起來的。 重型挖掘機的歷史始于1835 年，當時發(fā)明了拉鏟式挖掘機用于開挖堅硬的土石方及裝載卡車。當然，隨著汽油機和柴油機車輛的發(fā)明，工程機械也變得越來越適用。雖然在一些專用設備上使用了電力驅動、蓄電池驅動和丙烷氣罐，然而大多數(shù)工程機械仍然依靠柴油機驅動。 客戶要求推動著設計的改進。自從2000 年以來，客戶所期望改進的兩個主要方面為操作方便性和操作舒適性。操作簡單的要求迫于在市場中很難找到熟練操作人員的事實。由于電子技術、自動化、高性能發(fā)動機技術、在線診斷技術的不斷集成，操作性和可靠性均得到了不斷的改進。目前，制造商在進行各種成本效益方面的改進。 3. 應用 1 2 3 4 5 6 7 8 9 1.挖掘裝載 2.石方工程 3. 采掘工程 4.巖石破碎 5. 鋪設管道 6. 起吊重物 7. 整理邊坡 8. 疏通水道 9. 清理作業(yè) 4. 組成與特點 1）總體結構 1.柴油機及液壓系統(tǒng) 2.行走支承機構 3.回轉機構 4. 工作裝置總成 5. 轉向操縱系統(tǒng) 2）主要部件 柴油機及液壓系統(tǒng)： 1. 柴油機 2. 液壓泵 行走支承機構： 1.主機架 2. 履帶 3. 導向輪 4. 履帶臺車架 5. 最終傳動裝置（液壓馬達與驅動鏈輪） 工作裝置總成： 1.鏟斗 2. 鏟斗連接件 3. 鏟斗油缸 4. 斗桿 5. 斗桿油缸 6.動臂 7. 液壓管路 8.動臂油缸 9.斗齒 通用鏟斗： 1.抗扭增強鋼管 2. 兩邊側板 3. 斗底增強耐磨板條 4. 切削刃 轉向操縱系統(tǒng)： 1.駕駛員座椅 2. 扶手 3. 操縱控制手柄 4. 操縱踏板 5. 行走操縱桿 6. 工況監(jiān)視器 7. 儀表控制臺 5. 典型液壓系統(tǒng) 1. 液壓泵 2、4. 分配閥組 3. 單向閥 5. 速度限制閥 6. 液壓缸 7、8. 行走液壓馬達 9. 雙速閥 10.回轉液壓馬達 11. 動臂油缸 12. 輔助油缸 13. 斗桿油缸 14.鏟斗油缸 15. 背壓閥 16. 冷卻器 17. 濾油器 6. 尺寸規(guī)格 1. 海運高度 2. 海運長度 3. 尾部擺動半徑 4. 滾輪中心距離 5. 履帶長度 6. 離地間隙 7. 軌距 8. 運輸寬度 9. 駕駛室高度 10. 配重離地間隙 7. 工作范圍 1. 最大挖掘深度 2. 最大水平移動距離 3. 最大挖掘高度 4. 最大裝載高度 5. 最小裝載高度 6. 最大水平切削深度 7. 最大垂直挖掘深度 8.小型挖掘機特點 1. 新型鏟斗系列進行了改進設計，具有更大的斗容量、更強的破碎力和更好的垂直挖掘。 2. 安裝于動臂上和駕駛室前方的標準照明燈提供了最佳的夜間視覺。 3. 為避免損壞和停機，沿桿臂安全布置液壓缸軟管。為快速處理附件和更換零件，在機器外部連接動臂和斗桿軟管。 4. 動臂左、右獨立擺動，以適應側向挖掘。 5. 特殊的挖掘環(huán)境需要專業(yè)的挖掘機械，即使在15°的坡道上也可進行垂直挖掘作業(yè)。 6. 底盤進行了鑄鐵棱邊強化，幾乎不可損壞。這種重型保險裝置可在碰撞事故中保護機械部件。 9. 典型液壓挖掘機新技術 1)簡介 日立ZAXIS-3系列新一代液壓挖掘機具有一系列技術特點：清潔發(fā)動機，先進的日立液壓技術，堅固耐用的行走底盤和工作裝置附件，以及功率與速度的良好匹配。ZAXIS-3系列挖掘機所具有的生產(chǎn)率、壽命和可靠性得到了檢驗證實，特別是在重型挖掘和采石場作業(yè)更加適用。 以較低的燃料消耗獲得更大的生產(chǎn)能力是新型發(fā)動機和液壓系統(tǒng)研究的目標。 2)先進的液壓技術 1. 挖掘力增加。鏟斗挖掘力增加7%，桿臂挖掘力增加8%。 2. 加速型動臂再循環(huán)系統(tǒng) 動臂下降與桿臂組合作業(yè)時，與常規(guī)挖掘機相比較桿臂速度大約可增加15%。動臂油缸底部一端的壓力油被輸送到動臂油缸的活塞桿一邊，以降低動臂，動臂重量加速了降低過程。而在一般情況下，通過使來自液壓泵的壓力油流入動臂油缸活塞桿一端降低動臂。新系統(tǒng)也可以實現(xiàn)擺動與降低動臂的高效組合作業(yè)。 3.動臂工作模式選擇 挖掘機前部工裝提升或推移機體的力量大小可通過一個ON/OFF選擇開關進行選擇。這種選擇有助于提高操作舒適性和延長部件工作壽命。 4. 大直徑前部管路 增加桿臂油管直徑以減少液壓損失（理論上為7%）提高作業(yè)速度。 5. 動臂與桿臂的組合作業(yè) 在回轉+動臂下降+桿臂外伸的組合作業(yè)中，或者在平整作業(yè)（動臂下降+桿臂外伸）中，可大大提高桿臂外伸速度。原因在于，在桿臂外伸的組合作業(yè)中當需要減少液壓損失時，桿臂回路中的可變節(jié)流閥將對流量進行調(diào)節(jié)。 6. 新型鏟斗再循環(huán)系統(tǒng) 通過新型的鏟斗再循環(huán)回路能夠加快組合挖掘作業(yè)中鏟斗的動作。當鏟斗上的載荷較輕時，由鏟斗油缸活塞桿一端產(chǎn)生的壓力油通過再循環(huán)閥傳輸?shù)界P斗油缸底端以便有效利用液壓能量。 10. 加強型行走機構 1. 回轉軸承承載能力增強 回轉循環(huán)滾珠軸承采用了更多的滾珠，使?jié)L圈的承載能力大約提高了6%，即使在重載工況下也能穩(wěn)定運行。 2. 強化履帶鏈 每一履帶鏈條的凸臺直徑增加了大約19%。每一履帶鏈條的厚度也增加了大約57%。加厚的履帶鏈條延長了使用壽命。 3. 強化了上托鏈輪支架。增加上托鏈輪支架壁厚以提高強度。 4. 全履帶防護裝置標準化 在H型挖掘機上，提供了標準的全履帶防護裝置。全履帶防護裝置保護了履帶鏈條和支重輪，避免了損壞與變形。而且，履帶防護裝置也阻止了石塊，防止了行走機構的過載，減少了磨損和損壞。 5. 壓力防松主銷。對每個履帶鏈條主銷進行加壓，代替了使用釘型銷的防松工藝。 6. 增強型導向輪支座。導向輪支座支承長度延長了大約67%以增加耐久性和壽命。 7. 增強型導向輪支架。增加導向輪支架厚度以提高剛度，防止變形并增加耐久性。 11. 增強型工作裝置 1.高強度銷軸材料強度增加5%。應用高強度鋼材，使桿臂和動臂上的銷軸強度提高5%。 2.增強型通用鏟斗。 鏟斗斗齒改為超級V型齒，使鏟入平穩(wěn)、生產(chǎn)率提高。鏟斗銷軸兩端均使用襯套，以便消除間隙，防止急拉式作業(yè)。 3.H型重型強化鏟斗，改進重型鏟斗，增強鏟斗零件，提高耐久性。 12. 提高駕駛員舒適性 寬敞的駕駛室符合人機工程學設計，具有最佳的視野，減少了駕駛員工作疲勞與負荷。 1. 最佳的視野 為獲得最佳視野加寬玻璃窗，特別是改善了行走和挖掘時右下方的視野。 2. 寬敞的足下空間，足下空間向前擴展，改進踏板形式保證愉快操作。 3. 短行程操縱桿 短行程操縱桿的指尖控制在扶手幫助下能夠長時間進行無疲勞連續(xù)操作（操縱桿操作力減小30%）。 4. 設計舒適的操作按鈕 駕駛員座椅依照人機工程學原理設計，以便使駕駛員長時間愉快操作。加寬座椅靠背，使駕駛員操作安全穩(wěn)固，并且改進了座椅頭靠的形狀。對座椅進行增強以較小振動和沖擊，并提高耐久性。 5. 充液彈性支座 駕駛室安裝于充液彈性支座上，從而吸收了沖擊和振動，提高了駕駛員工作舒適性。 6. 大界面多語言多功能監(jiān)視器 彩色大界面監(jiān)視器與配重上方的后視攝像頭（可選件）組合，為駕駛員提供了機械后方的無障礙視野。該系統(tǒng)提高了挖掘機回轉與倒車時的安全性。 13. 維護簡單方便 維護保養(yǎng)簡單，其中包括方便的檢查、保養(yǎng)和清潔。 1. 發(fā)動機清潔簡單方便 與傳統(tǒng)的內(nèi)聯(lián)布置方法不同，對散熱器和機油冷卻器進行并行布置，以方便拆卸。這一新型布置極大地方便了散熱器和機油冷卻器的清潔。 2. 標準化雙主燃油濾清器 除粗濾器外，設置了兩個主燃油濾清器以減小發(fā)動機油路的堵塞。 3. 排油方便 發(fā)動機油底殼設置有排油管接頭。需要排油時，將排油軟管與排油管接頭連接。與旋塞不同，這種排油管接頭使用可靠，避免了油的泄露和人為破壞。 4. 自動潤滑，前部工作裝置采用自動潤滑方式，將桿臂頂部的潤滑點重新設置在側面。 5. 較長的液壓油濾清器更換時間間隔 液壓油濾清器更換時間間隔由500h延長至1000h以降低使用成本。 14．環(huán)境保護 提供符合嚴格排放標準的清潔發(fā)動機。 1. 環(huán)境友好設計 清潔發(fā)動機符合歐III與美國環(huán)保局(EPA)3級排放標準，減少了氮氧化物(NOx)和微粒(PM)的排放。 2. 低噪聲發(fā)動機 發(fā)動機噪聲大約減小了2 dB。不言而喻，該發(fā)動機符合歐洲噪聲標準。 3. 變速風扇，發(fā)動機冷卻風扇為大直徑（1120 mm）電液控制變速風扇。當溫度達到高溫區(qū)時，風扇自動啟動，并保證低噪聲運行。 4. 合格消聲器，使用較大規(guī)格的消聲器大大降低了噪聲與排放。 5. 標記可再生零件，標記樹脂材料零件以便再生利用。這種做法有助于再生廢料的分揀。 6. 減輕環(huán)境負擔 通過使用無鉛線束蓋、散熱器、機油冷卻器等實現(xiàn)了無鉛化設計。未使用任何石棉物。使用鋁制散熱器、機油冷卻器和內(nèi)置冷卻器提高了機械的耐久性。 7. 生物可降解液壓油，可降解液壓油是生態(tài)環(huán)保性的，在水中和地下可分解為水與二氧化碳。 15. 高安全性 1. 不銹鋼結構駕駛室 CRES II型駕駛室設計為駕駛員提供了“以防萬一”的保護。傾翻時的安全性得到了改善。駕駛室頂部可承受9倍載荷。 2. H/R型駕駛室 H/R型駕駛室利用增強型前窗和頂部落物保護結構以防下落物的破壞。由多層平面玻璃制做的前窗被固定，防止了污物和碎片的侵入。駕駛室具有完全防護功能，符合ISO對于二級OPG駕駛室的各項要求。 3. 新型駕駛操縱鎖定桿 除非將鎖桿完全鎖定，否則發(fā)動機就不能啟動。該設置防止了由于無意識碰上操縱桿時所產(chǎn)生的快速晃動。