<p class="MsoNormal" style="margin:0cm 0cm 0pt;"><b style="mso-bidi-font-weight:normal;"><span style="font-size:small;"><span style="color:red;font-family:宋体;mso-ascii-font-family:'Times New Roman';mso-hansi-font-family:'Times New Roman';">视频：螺旋千斤顶操作运行龙海起重工具<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:personname w:st="on" productid="姜">姜</st1:personname>女士</span><span lang="EN-US" style="color:red;"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></span></b></p> <p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span style="font-size:small;"><span style="font-family:宋体;mso-ascii-font-family:'Times New Roman';mso-hansi-font-family:'Times New Roman';">龙海</span><b style="mso-bidi-font-weight:normal;"><span lang="EN-US"><a href="http://www.zglhqz.com/"><span lang="EN-US" style="font-family:宋体;mso-ascii-font-family:'Times New Roman';mso-hansi-font-family:'Times New Roman';"><span lang="EN-US">螺旋千斤顶</span></span></a></span></b><span lang="EN-US"><span style="font-family:'Times New Roman';"> </span></span><span style="font-family:宋体;mso-ascii-font-family:'Times New Roman';mso-hansi-font-family:'Times New Roman';">又称机械式千斤顶，是由人力通过螺旋副传动，螺杆或螺母套筒作为顶举件。普通螺旋千斤顶靠螺纹自锁作用支持重物，构造简单，但传动效率低，返程慢。自降螺旋</span><span lang="EN-US"><a href="http://qianjindingwxj.b2b.youboy.com/"><span lang="EN-US" style="font-family:宋体;mso-ascii-font-family:'Times New Roman';mso-hansi-font-family:'Times New Roman';"><span lang="EN-US">千斤顶</span></span></a></span><span style="font-family:宋体;mso-ascii-font-family:'Times New Roman';mso-hansi-font-family:'Times New Roman';">的螺纹无自锁作用，装有制动器。放松制动器，重物即可自行快速下降，缩短返程时间，但这种</span><span lang="EN-US"><a href="http://www.sg560.com/shop/qianjinding/"><span lang="EN-US" style="font-family:宋体;mso-ascii-font-family:'Times New Roman';mso-hansi-font-family:'Times New Roman';"><span lang="EN-US">千斤顶</span></span></a></span><span style="font-family:宋体;mso-ascii-font-family:'Times New Roman';mso-hansi-font-family:'Times New Roman';">构造较复杂。螺旋千斤顶能长期支持重物，最大起重量已达</span><span lang="EN-US"><span style="font-family:'Times New Roman';"> 100</span></span><span style="font-family:宋体;mso-ascii-font-family:'Times New Roman';mso-hansi-font-family:'Times New Roman';">吨，应用较广。下部装上水平螺杆后，还能使重物作小距离横移。此外我公司还供应</span><span lang="EN-US"><a href="http://qizhong.wanye68.com/"><span lang="EN-US" style="font-family:宋体;mso-ascii-font-family:'Times New Roman';mso-hansi-font-family:'Times New Roman';"><span lang="EN-US">张拉千斤顶</span></span></a></span><span style="font-family:宋体;mso-ascii-font-family:'Times New Roman';mso-hansi-font-family:'Times New Roman';">、<b style="mso-bidi-font-weight:normal;">手摇式千斤顶</b>、</span><span lang="EN-US"><a href="http://lhqzlwp.cn.maiyes.com/"><span lang="EN-US" style="font-family:宋体;mso-ascii-font-family:'Times New Roman';mso-hansi-font-family:'Times New Roman';"><span 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