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本科毕业设计（论文）通过答辩
摘 要
本论文主要阐述了一般掩护式液压支架的设计过程。设计内容包括：选架型、总体设计、主要零部件的设计、主要零部件的校核和液压系统的设计。
由于该煤层厚度适中，选用掩护式液压支架。煤层厚度介于2.5~3.8m之间，煤层厚度变化较大，选用调高范围大且抗水平推力强且带护帮装置的掩护式支架。支架采用正四连杆机构，以改善支架受力状况。顶梁、掩护梁、底座均做成箱体结构；立柱采用双伸缩作用液压缸，以增加工作行程来满足支架调高范围的需要。推移千斤顶采用框架结构，以减少推溜力和增大移架力。为了提高移架速度，确保对顶板的及时支护，采用锥阀液压系统。
关键词：液压支架 液压 四连杆机构 采煤 支架选型 推溜 移架
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本科毕业设计（论文）通过答辩
Abstract
The article mainly elaborated the general shield type hydraulic pressure support design process. The design content includes: Chooses, the system design, the main spare part design, the main spare part examination and the hydraulic system design.
Because this coal bed thickness is moderate, selects the shield type hydraulic pressure support. Coal bed thickness is situated between between the 2.5~3.8 rice, coal bed thickness change bigger, selects adjusts the high scope big also the anti- horizontal thrust is strong also the belt protects helps the equipment the shield type support. The support uses the four link motion gear, improves the support stress condition. The top-beam, caving shield, the foundation makes the packed in a box body structure; The column uses the double expansion and contraction function hydraulic cylinder, increases the power stroke to satisfy the support to adjust the high scope the need. Passes the hoisting jack to use the portal frame construction, reduces pushes slides the strength and increases moves a strength. In order to enhance moves a speed, guarantees is prompt to the roof support, uses the mushroom valve hydraulic system.
Key word: The hydraulic pressure support , hydraulic pressure , four-link mechanism , mining coal, support shaping push forwards the conveyer, advancing the powered support.
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本科毕业设计（论文）通过答辩
目 录
1 概述?????????????????????????????????5
1.11.21.31.4
液压支架的组成和分类???????????????????????5 液压支架的工作原理????????????????????????8 液压支架的支护方式????????????????????????11 支架选型的基本参数????????????????????????12
2 总体设计??????????????????????????????14
2.1选架型?????????????????????????????14 2.2液压支架基本参数的确定??????????????????????16 2.3采煤机、液压支架和输送机的配套??????????????????19 2.4四连杆机构设计?????????????????????????21 2.5顶梁长度的确定?????????????????????????28 2.6立柱及柱窝位置的确定??????????????????????29 2.7平衡千斤顶位置的确定???????????????????33 2.8其它千斤顶位置的确定???????????????????36
3 支架的受力计算???????????????????????????39
3.1 3.2 3.3 3.4 4.14.24.34.44.54.64.75.15.25.35.45.55.65.7
液压支架受力分析?????????????????????39 确定支架的支护强度????????????????????40 底座接触比压计算?????????????????????40 支架支护效率???????????????????????40 前梁?????????????????????????????43 主顶梁??????????????????????????????43 掩护梁??????????????????????????????44 前、后连杆????????????????????????????45 底座????????????????????????????45 立柱???????????????????????????????46 千斤顶??????????????????????????????47 校核的基本要求??????????????????????????49 前梁的校核????????????????????????????50 主顶梁的校核???????????????????????????52 掩护梁的强度校核?????????????????????????55 底座强度校核???????????????????????????57 销轴和耳座的强度校核???????????????????????59 立柱强度校核???????????????????????????62
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4 液压支架的主要部件的设计?????????????????????42
5 主要零、部件的强度校核???????????????????????49