A clamping device (400, 1100, 2500, 2600) comprising a clamp bar (450, 650, 850, 1050, 1250, 1750, 1950, 2050, 2250); a first jaw assembly coupled to the clamp bar (450, 650, 850, 1050, 1250, 1750, 1950, 2050, 2250), wherein the first jaw assembly comprises a first jaw (441, 1041, 1241, 2541,2641); wherein the first jaw assembly further comprises a jaw support (442, 1042, 1242, 1442, 2042, 2142, 2342, 2542, 2642), characterised in that the jaw support is movably coupled to the clamp bar, together with a locking mechanism (420, 870, 875, 1172, 1272, 2070, 2551) for securing the jaw support to the clamp bar (450, 650, 850, 1050, 1250, 1750, 1950, 2050, 2250), wherein the jaw support (442, 1042, 1242, 1442, 2042, 2142, 2342, 2542, 2642) comprises a slanting surface, wherein the slanting surface (472, 477, 2148) tilts toward the first jaw at a portion of the jaw support (442, 1042, 1242, 1442, 2042, 2142, 2342, 2542, 2642) nearer the clamp bar (450, 650, 850, 1050, 1250, 1750, 1950, 2050, 2250), wherein the first jaw (441, 1041, 1241, 2541, 2641) is flexibly coupled to the jaw support (442, 1042, 1242, 1442, 2042, 2142, 2342, 2542, 2642), wherein the first jaw (441, 1041, 1241, 2541, 2641) and the jaw support (442, 1042, 1242, 1442, 2042, 2142, 2342, 2542, 2642) are configured to form a cavity, a second jaw assembly coupled to the clamp bar (450, 650, 850, 1050, 1250, 1750, 1950, 2050, 2250), wherein the second jaw assembly comprises a second jaw (461, 466, 660, 665, 1060, 1260, 1760, 2560, 2660), wherein the first jaw (441, 1041, 1241, 2541, 2641) and the second jaw (461, 466, 660, 665, 1060, 1260, 1760, 2560, 2660) are configured for clamping on an object, a pulling element (430, 435, 837, 1030, 1130, 1230, 1630, 2030, 2130, 2230, 2330, 2530, 2630) coupled to the first jaw assembly, wherein the pulling element (430, 435, 837, 1030, 1130, 1230, 1630, 2030, 2130, 2230, 2330, 2530, 2630) is disposed in the cavity between the first jaw (441, 1041, 1241, 2541, 2641) and the jaw support (442, 1042, 1242, 1442, 2042, 2142, 2342, 2542, 2642), wherein the coupling between the pulling element (430, 435, 837, 1030, 1130, 1230, 1630, 2030, 2130, 2230, 2330, 2530, 2630) and the first jaw assembly comprises a slanting interface, wherein the slanting interface is configured so that when a force is applied to the pulling element (430, 435, 837, 1030, 1130, 1230, 1630, 2030, 2130, 2230, 2330, 2530, 2630) in a direction comprising a vertical direction, a second force is generated pushing the first jaw in a direction comprising a direction from the first jaw (441, 1041, 1241, 2541, 2641) to the second jaw (461, 466, 660, 665, 1060, 1260, 1760, 2560, 2660). wherein the first jaw assembly comprises a first jaw (441, 1041, 1241, 2541,2641); wherein the first jaw assembly further comprises a jaw support (442, 1042, 1242, 1442, 2042, 2142, 2342, 2542, 2642), characterised in that the jaw support is movably coupled to the clamp bar, together with a locking mechanism (420, 870, 875, 1172, 1272, 2070, 2551) for securing the jaw support to the clamp bar (450, 650, 850, 1050, 1250, 1750, 1950, 2050, 2250), wherein the jaw support (442, 1042, 1242, 1442, 2042, 2142, 2342, 2542, 2642) comprises a slanting surface, wherein the slanting surface (472, 477, 2148) tilts toward the first jaw at a portion of the jaw support (442, 1042, 1242, 1442, 2042, 2142, 2342, 2542, 2642) nearer the clamp bar (450, 650, 850, 1050, 1250, 1750, 1950, 2050, 2250), wherein the first jaw (441, 1041, 1241, 2541, 2641) is flexibly coupled to the jaw support (442, 1042, 1242, 1442, 2042, 2142, 2342, 2542, 2642), wherein the first jaw (441, 1041, 1241, 2541, 2641) and the jaw support (442, 1042, 1242, 1442, 2042, 2142, 2342, 2542, 2642) are configured to form a cavity, wherein the second jaw assembly comprises a second jaw (461, 466, 660, 665, 1060, 1260, 1760, 2560, 2660), wherein the first jaw (441, 1041, 1241, 2541, 2641) and the second jaw (461, 466, 660, 665, 1060, 1260, 1760, 2560, 2660) are configured for clamping on an object, wherein the pulling element (430, 435, 837, 1030, 1130, 1230, 1630, 2030, 2130, 2230, 2330, 2530, 2630) is disposed in the cavity between the first jaw (441, 1041, 1241, 2541, 2641) and the jaw support (442, 1042, 1242, 1442, 2042, 2142, 2342, 2542, 2642), wherein the coupling between the pulling element (430, 435, 837, 1030, 1130, 1230, 1630, 2030, 2130, 2230, 2330, 2530, 2630) and the first jaw assembly comprises a slanting interface, wherein the slanting interface is configured so that when a force is applied to the pulling element (430, 435, 837, 1030, 1130, 1230, 1630, 2030, 2130, 2230, 2330, 2530, 2630) in a direction comprising a vertical direction, a second force is generated pushing the first jaw in a direction comprising a direction from the first jaw (441, 1041, 1241, 2541, 2641) to the second jaw (461, 466, 660, 665, 1060, 1260, 1760, 2560, 2660).