The role of the square sets is used to connect the column aluminum alloy light frame and the beam aluminum alloy light frame, when pulling the square with a chain hoist, you can drive the beam up and down to move. The square is provided with a pulley so that the square can slide vertically along the direction of the column. Square sets are different from the six-sided joints, six-sided joints can not be connected up and down after the beam, and Fang sets can be moved.
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