【正文】
副主梁寬度 ,取腹板內側間距 且 1100,主腹板一側上翼緣板外伸長度 ,取外伸長 ,取。初設截面尺寸如下圖 圖(6)形心即對稱中心 對形心軸的慣性矩:凈截面面積 毛截面面積 四、各截面尺寸及性質匯總表圖(7)尺寸匯總表 單位:mm主主梁跨中181814122530232622002400跨端181814122530232622001264副主梁跨中16161081270118011001500跨端1616108127011801100800端梁12121010660660600776凈面積毛面積主主梁跨中123912571512085351034跨端12376751216722837066副主梁跨中629782662001681244跨端62442753600904944端梁33040031360480680第二章 橋架分析167。167。2. 主主梁、副主梁的端部與端梁在同一水平面內。4. 將端梁結構看作多跨靜定梁,主主梁受力作為基本結構對副主梁無影響;副主梁受力作為附屬部分對主主梁有影響。 167。由軌道型號QU120查得軌道理論重量,主小車軌道重量 欄桿等重量 主梁的均布載荷 2.主小車布置,兩側起升機構對稱布置,重心位于對稱中心。圖(8)與主主梁連接的端梁部分(將超出軌距的一部分所假想而成的端梁截面尺寸) 其截面尺寸如下形心 對形心軸 的慣性矩:對形心軸的慣性矩:端梁凈截面積 端梁毛截面積 一根端梁單位長度重量一組大車運行機構重量 司機室及其電氣設備的重量 主主梁側假想端梁重 (1) 滿載小車在主主梁跨中左側端梁總靜輪壓由下圖(12)計算 由 查圖38得,側向力為 滿載小車在主主梁左端極限位置左側端梁總靜輪壓為 此處省略半橋架中點的換算質量為半剛架跨中在單位水平力作用下產生的水平位移為橋式起重機的水平自振頻率為167。 主主梁端部耳板設計計算主主梁跨端結構受力,工況:滿載小車位于主梁跨端,大小車同時運行起制動及橋架偏斜。167。工況:取滿載小車位于主梁跨端,大小車同時起、制動及橋架偏斜。因作用點外移引起的附加水平彎矩為先求支反力:端梁的水平反力 水平剪切力 彎矩 截面11剪切力 軸向力 2.強度校核只需校核22截面截面角點①處應力腹板邊緣的應力翼緣板對中軸的靜矩為折算應力為 3.疲勞強度只考慮垂直載荷,工況:滿載小車位于跨中及跨端截面22。5.校核銷軸所受的力如圖(40),耳板與端梁連接處銷軸4,所受垂直方向的剪力較大,而3受水平方向拉力,其在垂直方向幾乎不受力。設計銷軸直徑為對銷軸 合格對支撐板的擠壓應力,設支撐板厚20mm。主梁翼緣板伸出梁端套裝在端梁翼緣板外側。副主梁最大支承力 連接處需要的焊縫長度為: (合格)至此橋架設計全部合格,橋架結構施工圖見附圖。這次設計橋式鑄造起重機的突出特點是工作級別高、起重量大。另一個收獲就是要學會根據結構受力的特點應用材料,將材料用到該用的地方。比如主腹板上側受局部壓應力較大,則局部加厚主腹板上側部分,使其能夠承擔更大的應力。在設計過程中,得到了學院有關領導的關心和支持,尤其是指導老師給了我們很大的幫助,在此對他們認真負責的精神和付出的辛苦表示衷心的感謝。需要在今后的學習和工作中總結提高。參考文獻[1] 徐克晉主編 《金屬結構》 北京:機械工業(yè)出版社 1982.[2] 徐格寧主編 《起重運輸機金屬結構設計》 北京:機械工業(yè)出版社 1995.[3] 大連起重機器廠編 《起重機設計手冊》 沈陽:遼寧人民出版社 1979.[4] 徐格寧主編 《機械裝備金屬結構設計》 普通高等教育‘十一五’國家級規(guī)劃教材 [5] 起重機設計手冊編寫組 《起重機設計手冊》 北京:機械工業(yè)出版社 1977.[6] 倪慶興、王殿臣主編 《起重輸送機械圖冊》 北京:機械工業(yè)出版社 1992.[7] 張質文、王金諾主編 《起重機設計手冊》 北京:中國鐵道出版社 1997.[8] 陳道楠、盛漢中主編 《起重機課程設計》 冶金工業(yè)出版社 1982.[9] 徐格寧、智浩編 《太原重型機械學院學報》 1993年第4期第14卷《鑄造起重機橋架空間結構分析與疲勞計算》 1993.[10] 劉鴻文主編 《材料力學》 高等教育出版社 2003.附錄APortal powerChina’s rapid economic growth in the past decade has resulted in a big increase in freight traffic through the country’s seaports . Old ports are being expanded and new ports built to handle the large growth in container and bulk cargo traffic all along the Chinese coastline.China’s port expansion programme has provided a strong boost to the domestic port equipment industry, which has enjoyed a strong increase in demand for port cranes of various types, including container cranes and portal cranes along with bulk cargo handling equipment.Staterun China Harbour Engineering (group) Corporation Ltd, established under the ruling State Council, is China’s largest supplier of port cranes and bulk cargo handling equipment. The organization controls both Shanghai Zhenhua Port Machinery Co Ltd (ZPMC),the world’s largest manufacturer of quayside container cranes, and Shanghai Port Machinery Plant (SPMP), which specializes in the manufacturer of portal cranes and other cranes used in ports along with dry bulk cargo handling equipment.SPMP’s main market is China, although the pany is looking to expand its overseas sales. Although less well known than its associate ZPMC, SPMP also operates large manufacturing facilities, and is due to move part of its production shortly to Changxing Island near Shanghai where ZPMC already operates a large container crane fabrication plant.Portal and other harbour cranes are SPMP’s major production item. During the past two years, the corporation has won contracts for 145 portal cranes from port authorities throughout China, both from new ports under construction and ports undergoing expansion.In recent years, SPMP has also supplied portal cranes to the United States, Iraq,and port Rangoon of Myanmar in has purchased a 47m,40t portal crane while BIW of the United States has purchased three cranes15t,150t, and 300t portal cranes. Elsewhere, SPMP has supplied 12 portal cranes to several ports in Iraq since the end of the Saddam regime. In China, SPMP’s recent major orders for portal cranes include eight 40t, 45m radius cranes for Tianjin Overseas Mineral Terminal, while Yan Tai Port Bureau in Guangdong in southern China has purchased six 40t, 45m radius cranes. Other large orders include seven 10t, 25m radius cranes for Zhenjiang Port Group and an order of 1025t, 33m radius cranes from Fangcheng Port Bureau, while the Yi