【正文】 b 30000000 a 1417501 f 5989954576 fx 914641022 fy 5919711786 b 32021000 a 1428996 f 5979729017 fx 845086676 fy 5919711786 b 34000000 a 1439307 f 5971257171 fx 782894997 fy 5919711786 b 36000000 a 1448627 f 5964164957 fx 726825982 fy 5919711786 b 38000000 a 14571111 f 95958173210 fx 675899672 fy 5919711786 b 40000000 a 1464883 f 5953070238 fx 629331094 fy 5919711786 由以上分析可知當(dāng)絞板的轉(zhuǎn)角較小時(shí)液壓缸的壓力較大所以只需對(duì)液壓升降平臺(tái)在內(nèi)絞板的轉(zhuǎn)角較小時(shí)進(jìn)行受力分析和強(qiáng)度校核即可 7 遙控液壓升降平臺(tái)的有限元分析 應(yīng)用 ANSYS 對(duì)遙控液壓升降平臺(tái)的極限位置進(jìn)行有限元分析分析內(nèi)絞板的危險(xiǎn)截面的應(yīng)力和應(yīng)變 將內(nèi)絞板簡(jiǎn)化為懸臂梁在右端加 5000N 重力載荷 1當(dāng)內(nèi)絞板的轉(zhuǎn)角為 8度時(shí)由上章的 C語(yǔ)言編程求得絞 板的受力情況以及液壓缸的轉(zhuǎn)角 建立簡(jiǎn)化簡(jiǎn)支梁模型劃分網(wǎng)格如下圖 加載荷如下圖 各節(jié)點(diǎn)的受力情況如下 各節(jié)點(diǎn)出的應(yīng)變?nèi)缦? 最大應(yīng)力節(jié)點(diǎn)處的應(yīng)力情況 整個(gè)絞板的變形圖 經(jīng)有限元分析得出液壓升降平臺(tái)的內(nèi)絞板結(jié)構(gòu)合理既有一定的安全系數(shù)又有一定的過(guò)載內(nèi)力截面尺寸合理 參考文獻(xiàn) [1]張利平 現(xiàn)代液壓技術(shù)應(yīng)用 220 例 北京 化學(xué)工業(yè)出版社 2021 [2]上海煤礦機(jī)械研究所 液壓傳動(dòng)設(shè)計(jì)手冊(cè) 上海 上海人民出版19763752 [3] 雷天覺(jué) 液壓工程手冊(cè) 北京機(jī)械工業(yè)出版社 1999 [4] 徐 鄢主編 機(jī)械設(shè)計(jì)手冊(cè)第二版 上海 機(jī)械工業(yè)出版社 1992 [5]章宏甲黃誼王積偉 液壓與氣壓傳動(dòng) 北京 機(jī)械工業(yè)出版社 2021 [6] 李玉琳主編 液壓元件與系統(tǒng)設(shè)計(jì) 北京航空航天大學(xué)出版 2021 [7] 劉鴻文主編 材料力學(xué)第四版 高等教育出版社 2021 [8] 濮良貴紀(jì)名鋼主編機(jī)械設(shè)計(jì)第七版 高等教育出版社 2021 [9] 肖景和 無(wú)線電遙控組件及其應(yīng)用電路 人民郵電出版社 20804104105 [10] 夸克工作室 有限元分析基礎(chǔ)篇 清華大學(xué)出版社 2021 [11] 張冶洪雪 ProENGINEER 野火版 30 范例導(dǎo)航 清華大學(xué)出版社 2021 [12] 譚浩強(qiáng) C 程序設(shè)計(jì) 清華大學(xué)出版社 2021 [13] 雷天覺(jué) 新編液壓工程手冊(cè) 北京理工大學(xué)出版社 2021 [14] 甘永立 幾何量公差與檢測(cè) 上海科學(xué)技術(shù)出版社 2021 [15] 楊德興 工程圖學(xué)與計(jì)算機(jī)繪圖 北京航空航天大學(xué)出版社 2021 [16] Yeaple FFluid Power Design Handbook Znd EdRevised and ExpandedNew York and BaselMa rcel Dekker lnc1990pg78256 [17] Anthony Esposito Fluid Power with Applications New JerseyPrentice HallInc1988 4563 致 謝 感謝 附 錄 英文翻譯 Technical Specifications 10 Introduction This specification describes the elements of an on demand high pressure hydraulic power pack designed to supply mixed hydraulic fluid to the powered roof supports on the underground coal face The hydraulically powered roof supports rely on the reliabilit y and availability of the hydraulic fluid for clean and efficient operation 11 The main ponents of the power pack prise of Three Tri highpressure pumps of type S300 plete with 224kw electric motors Each pump will supply 318 litresmin at 375 M pa All Three pumps will be on demand Each pump will be fitted with an ElectroMechanical Unloading Valve Safety Relief Valve set at 449Mpa Surge Arrestors hoses cables and an Independent Pump Control Monitoring unit 12 The pumps will be supplied with mixed emulsion from an AutoMix Emulsion Production Tank with a working capacity of 4200 litres and a surge capacity of 1000 litres making a total of 5200 litres The oil partment of the tank has a capacity of 450 litres 13 The tank unit and each of the pump units are mounted on substantial skids and linked together to form single train like unit for assembly onto the customer supplied mobile carriages enabling transportation of the plete system in conjunction with the remainder of the coal face equipment 20 The RMI Pump Control System consisting of 21 One – Centralised Pump Control and Monitoring Panel for both Emulsion and Water System together with localised independent pump control and monitoring unit for each pump in both systems For further details refer to section under System Control Arrangement of Emulsion Pump Station CL4777 Hydraulic Schematic Diagram BL4273 SYSTEM OPERATION 10 Operation of the system begins with the supply of mine mains water via a Stop Valve to the input connection for the automatic emulsion production unit This water is cleaned by passing through pressure filter 25micron prior to a Solenoid Fill Valve on the tank the Solenoid Fill Valve controls the mains water input and is operated at fill and off levels by the fluid level switch located in the emulsion partment The water then passes to the Fluid Mixer which automatically mixes the water with the neat oil and the resulting emulsion is then fed into the emulsion partment in the tank The neat oil is transferred from barrels using the Oil Transfer Pump at a flow rate of 40Lmin This pump is protected by a Pressure Reducing Valve prior to the Stop valve Low fluid levels within both the mixed emulsion partment and the neat oil partment are controlled and monitored automatically with any excessive reduction in fluid capacity causing a signal to be sent to the pump control unit resulting in the system being shut down The fluid returning from the face equipment is cleaned by passing through a Duplex Filter 2micron This type of filter provides the valuable attribute of continuous operation even whilst being cleaned the flow is simply diverted from one channel to the other so that the dirty filter element may be changed and replaced with a clean element The emulsion partment in the tank is also fitted with a weir system which reduces the aeration and turbulence in the returning fluid before it reaches the suction area to prevent any possibility of cavitation in the pumps A Thermostat is fitted into the emulsion partment to prevent over temperature should this occur a signal will be sent to the control unit resulting in the system being shut down Each face delivery line from the pumps is fitted with a Pressure Filter 25 micron positioned on the adjacent connector assembly to the relevant pump an isolating valve is fitted on the outlet side of each