畢業(yè)論文----升降機設(shè)計（含外文翻譯）

上傳人：奔*** IP屬地：河北更新時間：2024-03-01 格式：doc 頁數(shù)：58 大?。?.33MB 人氣指數(shù)：12 舉報 版權(quán)申訴

已閱讀1頁，還剩57頁未讀，繼續(xù)免費閱讀

版權(quán)說明：本文檔由用戶提供并上傳，收益歸屬內(nèi)容提供方，若內(nèi)容存在侵權(quán)，請進行舉報或認領(lǐng)

文檔簡介

1、　　引言　　1. 本計算仍然采用千牛頓-厘米-秒制，g取10。其彈性模數(shù)對Q235鋼取E=2.1×MPa　　2. 本結(jié)構(gòu)對鋼結(jié)構(gòu)采用極限狀態(tài)計算方法。在本計算中，下述狀態(tài)均為極限狀態(tài)。　　①平衡鐵和吊欄摔下。

2、;　?、诘谝淮伟惭b30米，不附著，不拉懶風繩，即獨立高度30米時：　　A）30年一過的合風下的非工作狀態(tài)。B）B級強風下，超載25%的工作狀況。　?、垡院竺看伟锤?5米，即最高層附著以上的自由高度為20.5米，總高度105米時的工作和非工作狀態(tài)。　　3. 非工作狀態(tài)的風載取10級狂風風壓值的平均數(shù)440N/，并取

3、風振系數(shù)1.5，從而計算風壓取660N/,他已相當于11級暴風風壓的上限值664.2N/；工作狀況取6級強風風壓值119N/和風振系數(shù)2.25，從而計算風壓取268N/，他已相當于10級大風風壓值的上限：267N/。　　4. 工作載荷取一只吊欄超載25%對機架產(chǎn)生的彎矩和兩只吊欄同時超載25%對機架產(chǎn)生的壓力（彎矩為0），即最不利的情況計算，這種情形發(fā)生在一只吊欄停止另一只吊欄同時啟動的瞬間。如

4、由一人操作，這種情形將不會發(fā)生。　　5. 焊接件全部采用Q235鋼的第一組材料，在極狀態(tài)下，其許用應(yīng)力值是：　?、倏估?，抗壓，抗彎： {}=235N/=235MPa　?、诮呛缚p：壓，彎，剪：{}={}=160N/=160MPa　　6. 對于Q235鋼，在非極限狀態(tài)下，許

5、用應(yīng)力的取值是：　　{}=140—160MPa，{}=100—120MPa，對角焊縫：{}={}=120MPa　　7. 本計算采用偏于安全的計算方法，為多處支撐，只按一處支撐查穩(wěn)定系數(shù)。　　8. 個別計算結(jié)果，應(yīng)力值超過許用值，需要做具體分析，有的已經(jīng)采取了加固措施，同時，多種極限狀況，并不一定同時發(fā)生</

6、p>　　1. 整體設(shè)計　　1.1 整體構(gòu)造　　示意圖如圖1.1：　　圖1.1　　由一只主動輪

7、和2只壓緊輪組成牽引機，三根并列的鋼絲繩5首斷系在吊欄3上，經(jīng)頂滑輪6，牽引機和頂滑輪后末端系在平衡鐵4上。一臺機架中共有兩臺牽引機對稱布置。設(shè)吊欄自重為，裝上重量為P的貨物后，總重量為，各段鋼絲繩上的拉力依次為，用空吊欄提升重為的平衡鐵時，各段繩上的拉力為。　　1.2 求鋼絲繩上各段的拉力　　1.2.1 牽引傳動

8、;　　牽引傳動重畫如圖1.2：　　圖1.2　　求包角：　　主動輪底徑380，外徑396.壓緊輪底徑276，外徑296，初定鋼絲繩直徑11，　　則繩中心直徑分別為391和287。

9、　　主動輪和從動輪之間的關(guān)系：　　取含油鋼絲繩對生鐵滑輪的摩擦系數(shù)，則　　同理　　1.2.2 不同載荷下，鋼絲繩上各段拉力的計算值　　設(shè)計動載系數(shù)和滑輪效率，則不同載荷下鋼絲繩上各段拉力如下表1.1所示：單位KN

10、　　表1.1　　1.3 牽引機計算　　1.3.1 傳動效率：　　速度　　取軸承效率聯(lián)軸器效率</p&g

11、t;　　滑輪效率減速機效率　　總效率　　額定負荷時：　　超載15%時：　　超載25%時：

12、;　　空吊欄下降時：　　上述功率在表1.1最后一欄。　　1.3.2 安裝功率：　　安裝時拿去吊欄底板，此時連同安裝扒桿自重小于4.3KN　　選用Y132S-4電動機：N=5.5Kw n=

13、1440轉(zhuǎn)/分　　1.3.3 軸上壓力的計算：　　按超載25%并制動時計算，見表1.2。　　1.a軸　　2.A軸　　3.B軸</b

14、>　　同上，可計算出表1.1中2、4、6工作狀況下各軸上的壓力如表1.2，不同工況下軸上壓力如下：單位：KN　　表1.2　　2. 平衡鐵計算　　2.1 平衡鐵上升時強度校核

15、;　　2.1.1 結(jié)構(gòu)　　圖2.1　　如圖2.1所示，用5根[8于A、B、C、D、G、N處焊接而成，AC桿、BD桿截面如圖d，CD桿用口6×66封口，截面如圖b，CD桿正中EF段，領(lǐng)用口8×166加固截面如圖c。C、D交角處，上下用6△焊

16、接，兩側(cè)用σ6三角板加固，焊縫截面如圖e。下面用雙橫桿，截面如圖f。領(lǐng)在H、K、U、V處有滑輪導向，在G、M處有安全鉤。　　2.1.2 截面特性　　AC桿和BD桿，截面如圖2.1d　　查得[8： 　　CD桿，截面如圖2.1b&

17、lt;p>　　對口6×66，其 　　形心到X軸的距離：　　故　　EF段，截面如圖2.1c,板上有2-Φ17孔削弱　　形心到X軸（圖6形心）的距離：

18、　　AB桿，截面如圖2.1f　　C、D角焊縫　　2.1.3 求彎矩　　1.計算圖如圖2.2a　　圖2.2<p&

19、gt;　　各桿的線剛度：　　各節(jié)點兩邊桿的分配系數(shù)：　　C點： 　　A點： 　　2.求固定彎矩</p&

20、gt;　　取試驗荷載：，由此　　3.分配傳遞并迭加如下表　　表2.1　　4.合成彎矩圖如圖2.2b所示　　5.強度校核

21、;　　E、F截面：　　2.2 平衡鐵摔下時強度校核　　2.2.1 正面：　　（1）.受力圖　　按標準規(guī)定，取5倍額定載荷，即，將此載荷平

22、分在兩只安全鉤上：受力圖如圖2.3a所示：　　圖2.3　?。?）.彎矩圖　　彎矩圖如圖2.3b所示　?。?）.強度校核

23、;　　AB桿：　　2.2.2 側(cè)面：　?。?）.受力圖　　受力圖如圖2.4a所示：　　圖2.4&

24、lt;p>　　（2）.彎矩圖　　彎矩圖如圖2.4b所示　?。?）.強度校核　　[8的另向 　　2.2.3 滾輪軸及軸承校核

25、　　受力圖如圖2.5所示：　　圖2.5　　圖中　　軸頸 　　其中<p&g

26、t;　　選用45Cr，經(jīng)熱處理：其，在極限狀態(tài)下　　取　　軸承為203軸承，其，　　遠小于，又壓環(huán)的可能，然而是瞬間作用，平時工作時，其載荷近似于。　　2.2.4 安全鉤校核　　結(jié)構(gòu)如圖2.6

27、所示：　　圖2.6　　3. 吊欄計算　　3.1 吊欄柜寬試驗方向計算　　1.結(jié)構(gòu)示意和受力圖如圖3.1a所示　　圖3.1</b&g

28、t;　　由[8組成矩形框，在E、F處有滑輪導向，在G處有安全鉤繩吊在上梁正中R處，當超載25%并制動時，由表1，，吊欄自重作用在下梁正中K處，配重均布，，載荷偏位，作用在L處。　　2.求E、F處反力　　3.各桿的線剛度及分配系數(shù)　　各

29、桿均為2根[8，其 　　4.求固端彎矩　　5.分配傳遞并迭加如下表　　表3.1　　6.彎矩合成如圖3.1b所示　　7.強度校核<

30、;/b>　?。?）.R截面　?。?）.C角焊縫　　如圖3.2所示：　　圖3.2<p&

31、gt;　　3.2 吊欄框長度方向計算　　1.結(jié)構(gòu)示意和受力情況如圖3.3a所示　　圖3.3　　2.求反力　　3.各桿的線剛度及分配系數(shù)　　CD、C1D1、

32、A1B1桿相同，為[8，豎擺。其 　　AB桿為[8與[10之組合，如圖3.4　　圖3.4　　對[8： 　　對[10： 　　C1A1、D1B1設(shè)為[8，側(cè)擺，其

33、 　　CC1、A1A、DD1、B1B段為[8，側(cè)面用封口，截面如圖3.5所示：　　圖3.5　　對[8： 　　對口4×66： <

34、b>　　4.求固端彎矩　　5.分配傳遞并迭加如下表：　　表3.2　　6.合成彎矩圖如圖3.3b所示　　7.強度校核<b&g

35、t;　　N截面：　　D截面：　　C角：　　T截面：　　C角焊縫：截面如圖3.6所示<b&g

36、t;　　圖3.6　　3.3 卸貨時吊欄框長度方向計算　　1.受力圖　　如圖3.7a所示　　圖3.7

37、;　　卸貨快完成時，最后一塊預(yù)制板離開吊欄，二人自重加半塊預(yù)制板重作用于邊框L處，此時，吊欄靜止不動，，配重720-478=242kg均布，，此時：　　2.求反力　　3.計算固端彎矩　　4.分配傳遞并迭加如下表&l

38、t;p>　　表3.3　　5.合成彎矩圖如圖3.7b所示　　6.強度校核　　N截面：　　K截面：

39、　　T截面：　　C角焊縫：截面如圖3.6所示，其　　3.4 摔下時吊欄框長度方向計算　　1.受力圖　　如圖3.8a所示：</p&g

40、t;　　圖3.8　　吊欄摔下時，被安全鉤掛住于U、V處，按規(guī)范取，此時，配重均布，。　　2求反力　　3.計算固端彎矩　　4.分配傳遞并迭

41、加如下表：　　表3.4　　5.合成彎矩圖如圖3.8b所示　　6.強度校核　　S截面：　　G截面：&

42、lt;/b>　　B角截面：　　B角焊縫：　　3.5 摔下時吊欄框?qū)挾确较蛐：?lt;/p>　　1.受力圖：如圖3.9a所示　　圖3.9</

43、b>　　吊欄摔下時，被安全鉤掛住于G處，按規(guī)范取，，吊欄自重478kg，其中CD桿重，CA桿重，DB桿自重。　　AB桿自重與配重均布，，　　2.求反力　　3.計算固端彎矩

44、　　4.分配傳遞如下表　　表3.5　　5.合成彎矩圖如圖3.9b所示　　6.強度校核　　K截面（再和作用點）：&

45、lt;p>　　E截面（主桿裝滾輪處）：　　B角焊縫（同圖4.6所示）：　　K截面計算式中應(yīng)力超過許用值，但有地板加固，　　截面如圖3.10所示：　　圖3.10　　從而原

46、式變?yōu)椋?lt;/b>　　3.6 吊欄底框計算　　1.計算載荷的確定　?。?）.寬度方向　　見圖3.1a所示，載荷偏向右側(cè)24cm可求及，<b

47、>　?。?）.受力圖　　如圖3.11a所示：　　圖3.11　　（圖中虛線）在吊欄長度方向又偏右20cm，將此視為、的合力，從而可求及：　　2.求反力并作彎矩圖<

48、b>　　如圖3.11b所示　　3.吊欄底框（欄桿）截面計算　　吊欄底框由、和組成。截面如圖3.12所示　　圖3.12　?。?<p&

49、gt;　?。?　?。?　　軸為參考軸，求形心　　4.縱向強度校核　　5.底柜寬度方向&

50、lt;p>　?。?）.受力圖　　記上述式中的也向兩端分配，可得到邊角上的力值為：　　如圖3.13所示：　　圖3.13　　F端：413kg和211kg&l

51、t;/p>　　E端：315kg和161kg　　受力圖如圖3.14a所示：　　圖3.14　　合成彎矩圖如圖3.14b所示　?。?）.強度校核<

52、;p>　　3.7 緊繩器及吊欄頂板強度計算　　1.結(jié)構(gòu)　　如圖3.15所示　　圖3.15　　厚頂板焊接在吊欄框頂梁2根[8上，3只套環(huán)座各用一只U型螺栓

53、與頂板連接。由載荷表查得　　2.緊繩器強度校核　　考慮某一瞬間只有一只緊繩器承受全部拉力。　?。?）.M20螺栓受剪　?。?）.套環(huán)座樣板孔受擠壓　?。?）.套環(huán)座底板（口8×50）

54、受彎曲　?。?）.套環(huán)座樣板與度板用5-2焊接，焊縫受剪切　　3.頂板強度校核　　4.螺栓M16校核　　3.8 滾輪座、滾輪軸強度校核　　1.結(jié)構(gòu)如圖3.

55、16a所示　　圖3.16　　橫斷面如圖3.16b，連接滾輪座的吊欄立柱橫斷面如圖3.16c所示。　　2.工作時校核　?。?）.受力圖&

56、lt;p>　　由圖3.1a：　　由圖3.3a：　　由圖3.7a：　　圖3.1同圖3.3是同時發(fā)生。　?。?）.強度校核</b&g

57、t;　?。?）.吊欄立柱扭轉(zhuǎn)校核　　上式中的對立柱而言是扭矩。　　查及。　?。?）.滾輪軸校核　?。?）.軸承校核&

58、lt;/p>　　軸承選為204軸承，其、　　由，　　查得： 　　故　　轉(zhuǎn)速，查得<

59、;/p>　　按使用4年共計運轉(zhuǎn)3000小時，查得：　　故＜　　3.吊欄摔下時校核　?。?）.受力圖　　如圖3.1

60、6所示　　由圖3.8a有：　　由圖3.9a有：　?。?）.滾輪座校核　?。?）.吊欄立柱扭轉(zhuǎn)校核

61、　　軸頸 　　選用45Cr，并經(jīng)熱處理，其，取　　故改用45號鋼經(jīng)熱處理，其，則　?。?）.螺栓校核　　M12螺栓的公稱應(yīng)力面積

62、故　　3.9 安全鉤校核　　結(jié)構(gòu)如圖3.17所示：　　圖3.17　　見圖3.9a， 　　鉤子上的拉應(yīng)力&l

63、t;/b>　　銷子上的剪應(yīng)力　　焊縫上的拉應(yīng)力　　文獻翻譯　　原文：

64、Numerical Control　　One of the most fundamental concepts in the area of advanced manufacturing technologies is numerical control (NC).Prior to the advent of NC, all machine tools were manual operated

65、and controlled. Among the many limitations associated with manual control machine tools, perhaps none is more prominent than the limitation of operator skills. With manual control, the quality of the product is directly

66、related to and limited to the skills of the operator . Numerical control represents the first major 　　Numerical control means the control of machine tools and other manufacturing systems though the u

67、se of prerecorded, written symbolic instructions. Rather than operating a machine tool, an NC technician writes a program that issues operational instructions to the machine tool, For a machine tool to be numerically con

68、trolled , it must be interfaced with a device for accepting and decoding the p2ogrammed instructions, known as a reader.　　Numerical control was developed to overcome the limitation of human operator

69、, and it has done so . Numerical control machines are more accurate than manually operated machines , they can produce parts more uniformly , they are faster, and the long-run tooling costs are lower . The development of

70、 NC led to the development of several other innovations in manufacturing technology:　　1.Electrical discharge machining.　　2.Laser cutting.　　3.Electron beam we

71、lding.　　Numerical control has also made machine tools more versatile than their manually operated predecessors. An NC machine tool can automatically produce a wide variety of par 4s , each involving

72、an assortment of undertake the production of products that would not have been feasible from an economic perspective using manually controlled machine tools and processes.　　Like so many advanced tech

73、nologies , NC was born in the laboratories of the Massachusetts Institute of Technology . The concept of NC was developed in the early 1950s with funding provided by the U.S Air Force .In its earliest stages , NC machine

74、s were able to make straight cuts efficiently and effectively.　　However ,curved paths were a problem because the machine tool had to be programmed to undertake a series of horizontal and vertical ste

75、ps to produce a curve. The shorter is the straight lines making up the step ,the smoother is the curve . Each line segment in the steps had to be calculated.　　This problem led to the development in 1

76、959 of the Automatically Programmed Tools (APT) language for NC that uses statements similar to English language to define the part geometry, describe the cutting tool configuration, and specify the necessary motions. Th

77、e development of the APT language was a major step forward in the further development of NC technology. The original NC system were vastly different from those used punched paper , which was later to replaced by magnetic

78、 plastic tape .A tap　　A major problem was the fragility of the punched paper tape medium . It was common for the paper containing the programmed instructions to break or tear during a machining proce

79、ss, This problem was exacerbated by the fact that each successive time a part was produced on a machine tool, the paper tape carrying the programmed instructions had to rerun thought the reader . If it was necessary to p

80、roduce 100 copies of a given part , it was also necessary to run the paper tape thought the reader 100 　　This led to the development of a special magnetic tape . Whereas the paper tape carried the pr

81、ogrammed instructions as a series of holes punched in the tape , theThis most mportant of these was that it was difficult or impossible to change the instructions entered on the tape . To make even the most minor adjustm

82、ents in a program of instructions, it was necessary to interrupt machining operations and make a new tape. It was also still necessary to run the tape thought the reader as many times as　　The develop

83、ment of a concept known as numerical control (DNC) solve the paper and plastic tape problems associated with numerical control by simply eliminating tape as the medium for carrying the programmed instructions . In direct

84、 numerical control, machine tools are tied, via a data transmission link, to a host computer and fed to the machine tool as needed via the data transmission linkage. Direct numerical control represented a major step forw

85、ard over punched tape and plastic tape. However ,　　The evelopment of the microprocessor allowed for the development of programmable logic controllers (PLC) and microcomputers . These two technologies

86、 allowed for the development of computer numerical control (CNC).With CNC , each machine tool has a PLC or a microcomputer that serves the same purpose. This allows programs to be input and stored at each individual mach

87、ine tool. CNC solved the problems associated downtime of the host computer , but it introduced another problem known as data managem　　There are numerous situations where analog signals to be processe

88、d in many ways, like filtering and spectral analysis , Designing analog hardware to perform these functions is possible but has become less and practical, due to increased performance requirements, flexibility needs , an

89、d the need to cut down on development/testing time .It is in other words difficult pm design analog hardware analysis of signals.　　The act of sampling an signal into thehat are specialised for embedd

90、ed signal processing operations , and such a processor is called a DSP, which stands for Digital Signal Processor . Today there are hundreds of DSP families from as many manufacturers, each one designed for a particular

91、price/performance/usage group. Many of the largest manufacturers, like Texas Instruments and Motorola, offer both specialised DSP’s for certain fields like motor-control or modems ,and general high-performance SP</p&g

92、t;　　DSP’s more or less fall into two categories depending on the underlying architecture-fixed-point and floating-point. The fixed-point devices generally operate on 16-bit words, while the floating-point devi

93、ces operate on 32-40 bits floating-point words. Needless to say , the fixed-point devices are generally cheaper . Another important architectural difference is that fixed-point processors tend to have an accumulator arch

94、itecture, with only one “general purpose” register , making them quite tric　　There are thousands of different DSP’s on the market, and it is difficult task finding the most suitable DSP for a project

95、. The best way is probably to set up a constraint and wishlist, and try to compare the processors from the biggest manufacturers against it.　　The “big four” manufacturers of DSP’s: Texas Instruments,

96、 Motorola, AT&T and Analog Devices.　　Digital-to-analog conversion　　In the case of MPEG-Audio decoding , digital compressed data is fed into the DSP which performs the decodin

97、g , then the decoded samples have to be converted back into the analog domain , and the resulting signal fed an amplifier or similar audio equipment . This digital to analog conversion (DCA) is performed by a circuit wit

98、h the same name & Different DCA’s provide different performance and quality , as measured by THD (Total harmonic distortion ), number of bits, linearity , speed, filter char　　The TMS320 family DQ

99、P of Texas Instruments　　The TLS320family consists of fixed-point, floating-point, multiprocessor digital signal processors (DSP’s) , and foxed-point DSP controllers. TMS320 DSP have an architecture d

100、esigned specifically for real-time signal processing . The F/C240 is a number of the’C2000DSP platform , and is optimized for control applications. The C24x series of DSP controllers combines this real-time processing ca

101、pability with controller peripherals to create an ideal solution for control system applications. The fol　　--- Very flexible instruction set　　--- Inherent operational flexibility

102、 　　---High-speed performance　　---Innovative parallel architecture　　---Cost effectiveness　　Devices within a generation of the TMS320 fami

103、ly have the same CPU structure but different on-chip memory and peripheral configurations. Spin-off devices use new combinations of On-chip memory and peripherals to satisfy a wide range of needs in the worldwide electro

104、nics market. By integrating memory and peripherals onto a single chip , TMS320 devices reduce system costs and save circuit board space.　　The 16-bit ,fixed-point DSP core of the C24x devices provides

105、 analog designers a digital solution that does not sacrifice the precision and performance of their system performance can be enhanced through the use of advanced control algorithms for techniques such as adaptive contro

106、l , Kalman filtering , and state control. The C24x DSP controller offer reliability and programmability . Analog control systems, on the other hand ,are hardwired solutions and can experience performance degradation due&

107、lt;/p>　　The high-speed central processing unit (CPU) allows the digital designer to process algorithms in real time rather than approximate results with look-up tables. The instruction set of these DSP cont

108、rollers, which incorporates both signal processing instructions and general-purpose control functions, coupled with the extensive development time and provides the same ease of use as traditional 8-and 16-bit microcontro

109、llers. The instruction set also allows you to retain your software investment when　　The C24x architecture is also well-suited for processing control signals. It uses a 16-bit word length along with 3

110、2-bit registers for storing intermediate results, and has two hardware shifters available to scale numbers independently of the CPU . This combination minimizes quantization and truncation errors, and increases p2ocessin

111、g power for additional functions. Such functions might include a notch filter that could cancel mechanical resonances in a system or an estimation technique that cou　　The C24xDSP controllers take adv

112、antage of an set of peripheral functions that allow Texas Instruments to quickly configure various series members for different price/ performance points or for application optimization.　　This librar

113、y of both digital and mixed-signal peripherals includes:　　---Timers　　---Serial communications ports (SCI,SPI)　　---Analog-to-digital conver

114、ters(ADC)　　---Event manager　　---System protection, such as low-voltage and watchdog timer　　The DSP controller peripheral library is continually growing and c

115、hanging to suit the of tomorrow’s embedded control marketplace.　　The TMS320F/C240 is the first standard device introduced in the ‘24x series of DSP controllers. It sets the standard for a single-chip

116、 digital motor controller. The 240 can execute 20 MIPS. Almost all instructions are executed in a simple cycle of 50 ns . This high performance allows real-time execution of very comple8 control algorithms, such as adapt

117、ive control and Kalman filters. Very high sampling rates can also be used to minimize loop delays.　　The 240 has the architectural features necessary for high-speed signal processing and digital contr

118、ol functions, and it has the peripherals needed to provide a single-chip solution for motor control applications. The 240 is manufactured using submicron CMOS technology, achieving a log power dissipation rating . Also

119、included are several power-down modes for further power savings. Some applications that benefit from the advanced processing power of the 240 include: 　　---Industrial motor drives

120、;　　---Power inverters and controllers　　---Automotive systems, such as electronic power steering , antilock brakes, and climate control　　---Appliance and HVAC blower/ compressor m

眾賞文庫> 全部分類> 畢業(yè)設(shè)計

溫馨提示

1. 本站所有資源如無特殊說明，都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請下載最新的WinRAR軟件解壓。
2. 本站的文檔不包含任何第三方提供的附件圖紙等，如果需要附件，請聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
3. 本站RAR壓縮包中若帶圖紙，網(wǎng)頁內(nèi)容里面會有圖紙預(yù)覽，若沒有圖紙預(yù)覽就沒有圖紙。
4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
5. 眾賞文庫僅提供信息存儲空間，僅對用戶上傳內(nèi)容的表現(xiàn)方式做保護處理，對用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯，并不能對任何下載內(nèi)容負責。
6. 下載文件中如有侵權(quán)或不適當內(nèi)容，請與我們聯(lián)系，我們立即糾正。
7. 本站不保證下載資源的準確性、安全性和完整性, 同時也不承擔用戶因使用這些下載資源對自己和他人造成任何形式的傷害或損失。

畢業(yè)論文----升降機設(shè)計（含外文翻譯）

文檔簡介

溫馨提示

最新文檔

評論

畢業(yè)論文----升降機設(shè)計（含外文翻譯）

文檔簡介

溫馨提示

最新文檔

評論

免費下載