1. The horizontal arm can be lifted up and down, and it can also be rotated ±180 degrees with the column and travel with the flat car. 2. Can be retrofitted with manual or electric internal telescopic arms. 3. Additional manned operating platform (ordinary small square rail) can be. Heavy-duty additional manned operating platform. Extra heavy-duty additional manned operating platform 4.The electric rotary locking method is pneumatic locking. 5.Special requirements of the operating machine need to do detailed understanding before design.