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液壓升降台的工作原理

作者：編輯：來源：发布日期： 2020.12.31

信息摘要：

液壓升降台爲人工移動式，平台升降動力爲二機或三相電源，控制有手動控制和電動控制，另備有手壓泵，供停電時使用，該系列平台，具有移動靈活，升降平…

液壓升降台爲人工移動式，平台升降動力爲二機或三相電源，控制有手動控制和電動控制，另備有手壓泵，供停電時使用，該系列平台，具有移動靈活，升降平穩，操作方便等特點，主要用于工廠、機關、商店及建築裝修行業。

液压升降機由行走机构，液压机构，电动控制机构，支撑机构组成的一种升降機设备。液压油由叶片泵形成一定的压力，经滤油器、隔爆型电磁换向阀、节流阀、液控单向阀、平衡阀进入液缸下端，使液缸的活塞向上运动，提升重物，液缸上端回油经隔爆型电磁换向阀回到油箱，其额定压力通过溢流阀进行调整，通过压力表观察压力表读数值。

液缸的活塞向下运动（既重物下降）。液压油经防爆型电磁换向阀进入液缸上端，液缸下端回油经平衡阀、液控单向阀、节流阀、隔爆型电磁换向阀回到油箱。为使重物下降平稳，制动安全可靠，在回油路上设置平衡阀，平衡回路、保持压力，使下降速度不受重物而变化,由节流阀调节流量，控制升降速度。为使制动安全可靠，防止意外，增加液控单向阀，即液压锁，保证在液压管线意外爆裂时能安全自锁。安装了超载声控报警器，用以区别超载或设备故障。

電器控制系統通過防爆按鈕SB1—SB6來控制電機的轉動，隔爆型電磁換向閥的換向，以保持載荷提升或下降，且通過“LOGO”程序調整時間延遲量，避免電機頻繁起動而影響使用壽命。

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"The rebellion," he continued, "is known in history as the Tae-ping[Pg 340] insurrection. The words 'tae ping' mean 'general peace,' and were inscribed on the banners of the rebels. The avowed intention of the leader of the revolt was to overthrow the imperial power, and deliver the country from its oppressors. There were promises of a division of property, or, at all events, the rebels were to have free license to plunder wherever they went; and as there are always a great many people who have everything to gain and nothing to lose, the rebellion gathered strength as time went on. The leaders managed to convince the foreigners that they were inclined to look favorably on Christianity, and the idea went abroad that the Tae-pings were a sort of Chinese Protestants, who wanted to do away with old abuses, and were in favor of progress and of more intimate relations with foreign nations. Many of the missionaries in China were friendly to the rebellion, and so were some of the merchants and others established there. "I am to know Miss Rothvelt by finding her in a certain place." My honeyed bow implied that her being just now very much out of place was no fault of mine. "O say, can you see, by the dawn's early light, "Good heavens," Bruce cried hoarsely, "it is. It would be futile to deny it." 184 By the roadside came two figures tottering along, and then, turning to look at me, showed me the horror of their shrivelled bodies, their dimmed eyes—all that seemed alive in those drawn faces of skin and bone—the jaw stiffened in a skull-like grimace; victims of the famine, who had come from the Central Provinces where there had been no rain for two years, and where everything was dying. This couple were making their way to a poorhouse hard by. They had come from a village in Bundelkund, whence all the inhabitants had fled—themselves the sole survivors of a family of eighteen souls. First the children died, then the very old folks. These two had kept themselves alive on what had been given them on the way, but immigrants soon were too many in the districts unvisited by famine, and ere long they could get nothing; then they fed on roots, on what they[Pg 191] could steal from fields or garden-plots, or found left to rot, scorned even by the beasts. "Have you an Indian policy?" Dere Miss Maria Klegg: When they came to Odiam, she told Reuben what she had heard about Robert. "Age, or if you had a score or two of hempen ropes, with good grappling irons, it would be but boy's play to get aloft," said the galleyman. HoME 色优犹亚洲视频ENTER NUMBET 004www.sfmj.net.cn
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