Oil-pressure type fixed piston sampler

摘要

The present invention relates to an oil-pressure type fixed piston sampler for sampling a soil sample for site investigation. The oil-pressure type fixed piston sampler comprises a sampling unit (12) and an oil-pressure controller (14). Here, when the sampling unit (12) inserted into a drilled hole and a movable piston (80) moves downward, a sampling tube (1) moves downward to take a sample. The oil-pressure controller (14) connected with the sampling unit (12) controls oil pressure to cause the movable piston (80) to shift vertically. The sampling unit (12) comprises an upper head (20), a lower head (40), a piston housing (70), a rod block (100), a movable rod (90), a fixed piston (110), a fixed rod (92) and a separation rod (94). Since the sampling tube (1) takes a sample by a piston indentation method, high-quality, undisturbed samples can be obtained.

主权项

1. An oil pressure type fixed piston sampler comprising:
a sampling unit 12 configured to be inserted into a drilled hole such that when a movable piston 80 moves downward, a sampling tube 1 moves downward to take a sample; and an oil-pressure controller 14 connected to the sampling unit 12 and configured to control oil pressure to cause the movable piston 80 to move vertically, wherein the sampling unit 12 comprises:
an upper head 20 disposed above the movable piston 80;a lower head 40 disposed below the movable piston 80;a piston housing 70 joiningly disposed between the upper head 20 and the lower head 40 and configured to accommodate the movable piston 80 therein to cause the movable piston 80 to move vertically in the piston housing 70; a rod block 100 disposed below the lower head 40 and fixed to an upper side of the sampling tube 1; a movable rod 90 disposed to pass through the lower head 40 to cause the movable rod to move vertically and be supported by the lower head 40, the movable rod being joined at one end thereof to the movable piston 80 and joined at the other end thereof to the rod block 100 such that the rod block 100 is operated in cooperation with the movable rod 90 by the vertical movement of the movable piston 80;
a fixed piston 110 disposed to move vertically within the sampling tube 1; a fixed rod 92 disposed at the inside of the movable rod 90 to cause the movable piston 80 and the movable rod 90 to move vertically, the fixed rod being joined at one end thereof to the upper head 20 and joined at the other end thereof to the fixed piston 110 while passing through the rod block 100, the lower head 40, and the movable piston 80 such that the fixed piston 110 is supported by the fixed rod 92; and a separation rod 94 disposed at the inside of the fixed rod 92 so as to move vertically, the separation rod being joined at one end thereof to the fixed piston 110 and exposed at the other end thereof outwardly from the top of the upper head 20 while passing through the upper head, wherein the movable piston 80 further comprises a cushion protrusion 82 formed at the lower side thereof and having an outer diameter larger than that of the movable rod 90, and wherein the lower head 40 further comprises a cushion pocket 50 having a space defined at an upper portion thereof so as to allow the cushion protrusion 82 to be inserted thereto.