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In combination with the rigid-body replacement synthesis design approach, a double parallelogram lifting platform based on a lamina emergent mechanism is designed, which overcomes the disadvantage of a single parallelogram mechanism and improves the parallelism. Then a bi-stable grasper is designed, which is limited the slider movement to control the clamping force, using the second balanced state as a working condition to maintain a constant clamping force. At last these two parts are combined by subsidiary in order to drive the lift and clamp movement by only one motion. At the same time, based on a pseudo-rigid-body model, the force-displacement relationship is derived. One practical example is calculated according to this theory and is analyzed by finite element simulation to verify the correctness of the theory and the usability of the mechanism.

This study presents new detrital zircon laser ablation inductively coupled plasma mass spectrometry (LA‐ICP‐MS) U–Pb ages and in situ Hf–O isotopic data in order to constrain the depositional age and provenance of the Benxi Formation in the Sanmenxia area of the southern North China Craton (NCC). Detrital zircons in quartz sandstone drillcore from the Benxi Formation are euhedral–subhedral, oscillatory zoned, and have high Th/U ratios (0.03–1.60, generally greater than 0.3) that are indicative of a magmatic origin. Detrital zircons from samples 13H16A and 13H16B yield seven (2544, 1788, 1123, 955, 737, 441, and 344 Ma) and six main age populations (2440, 1583, 951, 759, 434, and 348 Ma), respectively. The εHf(t) values of the Neoarchean–Paleoproterozoic zircons range from −11.3 to +13.9, and these zircons have δ18O values that range from 5.68‰ to 8.83‰. The Neoproterozoic zircons have variable εHf(t) (−9.2 to +12.5) and δ18O (5.58‰ to 9.85‰) values, whereas the Palaeozoic zircons have εHf(t) values between −19.9 and +13.4 and δ18O values of 5.23‰–9.43‰. The Benxi Formation was deposited during the late Carboniferous and contains sediments derived from igneous rocks of the North Qinling Orogen combined with a small amount of material derived from Precambrian basement of the NCC. The northward subduction of the South Qinling Orogen caused the uplift and erosion of the North Qinling Orogen during the late Carboniferous. [ABSTRACT FROM AUTHOR]