main crank 中文意思是什麼
main crank
解釋
主曲柄-
This drilling adopts crank connecting link and walking beam percussion mechanism, which make the drilling possess two percussive functions, normal drilling takes connecting link impact as main mode, when encountering special situation and the connecting link impact can not drill, it can transform into hoisting impact, the stroke length can be modulated, it realizes automatic percussive drilling due to continuous operating of connecting link percussive mechanism, these can enhance drilling efficiency and relieve labor intensity ; it adopts pumping reverse circulation to drain slag, which not only resolves the drilling difficulty in special stratum such as pebble and gravel stratum and hard stratum, but also resolves the problem that the percussive drill ' s efficiency is low ; it adopts spur gear differential mechanism as double cylinders lazy tongs of main hoist, which not only ensures the balance state of drilling tool, but also reduces the mechanical design, and reduces the cost ; the bottom plate traveling motion of this drilling machine adopts walking type ; the drilling tower adopts hydraulic pressure uprising, and reduces the assistant operating time
該鉆機採用曲柄連桿、游梁式沖擊機構，使鉆機具有兩種沖擊功能;正常鉆進以連桿沖擊為主，遇到特殊情況，用連桿沖擊不能鉆進時，可轉為卷揚沖擊，沖程可調，因連桿沖擊機構連續工作，所以實現了自動沖擊鉆進，可提高鉆進效率，減輕勞動強度;採用泵吸反循環的方式排渣，既能有效解決卵礫石地層、堅硬地層等特殊地層鉆進的困難，又很好地解決了沖擊鉆機效率低下的問題;採用直齒圓柱齒輪差速機構作為主卷揚的雙筒同步機構，既保證了鉆具處于平衡狀態，又大大簡化了該機構設計，降低了成本;該鉆機底盤行走移位採用步履式;鉆塔採用液壓起立，減少了輔助作業時間。 -
The analysis of precision about mould - cut main mechanism with clearances is advanced. on the basis of analysis of slider displacement error influenced by the crank length tolerance, the coupler length tolerance and clearances in revolute joints for mould - cut main mechanism, some reasonable suggestions about tolerance distribution of bars length and fitting precision of joints are put forward
考慮運動副間隙對主切機構進行了精度分析，通過分析主切機構中各桿長誤差和運動副間隙對滑塊位移誤差的影響，對商標模切機設計初期桿長誤差分配和運動副間隙配合精度提出了合理的建議。 -
( 2 ) the crack compares with one depth with the first steps and the second steps natural frequency vibration, crack position near crank arm and main shaft transition round natural frequency little place under crankshaft ; with the third steps and the fourth steps natural frequency vibration, the smaller close to the second crank arm of crankshaft and round place natural frequency of the main shaft transition the position is
（ 2 ）裂紋同一深度比以第1階和第2階固有頻率振動，裂紋位置越靠近曲軸中間曲柄臂與主軸過渡圓處固有頻率越小；以第3階和第4階固有頻率振動，位置越靠近曲軸第二個曲柄臂與主軸過渡圓處固有頻率越小。 -
The main content of this thesis includes the following parts : ( 1 ) in chapter 2, the conditions of link lengths are derived for the side bars to rotate as cranks. two types of cranks are defined and then five - bar linkages are divided into four types, i. e. the full double - crank linkage, the double quasi - crank linkage and the double rocker linkage, and the crank - rocker linkage. the rotational ranges of the two side links for each type of the mechanism are analyzed, and the corresponding numerical algorithm is developed
本文主要做了以下幾方面的工作： （ 1 ）在第二章中，先導出五桿機構兩連架桿可整周轉動的桿長條件，並根據曲柄的存在情況，對五桿機構進行分類，即把五桿機構分成全曲柄機構、雙準曲柄機構、雙搖桿機構和準曲柄-搖桿機構四種類型。 -
During the shipbuilding in major shipyards worldwide, plenty of problems are generated out of shaft alignment, which results in the over - tolerance of main engine crank shaft, high temperature of bearing and excessive vibration
在船舶的建造過程中，世界各大船廠，都多次出現過軸系校中的問題，導致主機拐檔差超差，軸承高溫或造成振動過大等。 -
On the basis of the practical demand of surface finishing of thefamily of crank parts a design for horizontal barrel finishing is proposed. the finishing mechanism is illustrated, emphasis is put on analyzing the complicated relative motion between chip and parts ' surface, a mathematical model is set up, the main factors affecting on the finish are analyzed, and finally by an example of the crank barrel finishing it is shown that this technology is an ideal way to improve surface and practical performance
根據曲軸類零件表面光整加工的實際要求，提出並制定了臥式滾磨光整加工的工藝方案，在闡述加工機理的基礎上，重點分析了磨塊與工件表面間復雜的相對運動，建立了數學模型，分析了影響加工的主要因素，最後以曲軸滾磨光整加工實例表明該工藝是提高表面質量和改善使用性能的理想工藝。 -
The main research is as follows : analyze and research the characteristic of the crank - connect rod mechanism of the single - cylinder internal - combustion engine, the mathematical model of three - mass point has been established and the program of its inertia force and moment has been designed
研究工作主要包括以下內容:針對單缸內燃機活塞-連桿-曲柄機構的特點，運用運動學和動力學理論對其進行分析，建立了單缸內燃機的兩質點和三質點模型，推導出單缸內燃機不平衡慣性力和慣性力矩的數學模型。
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