The Longmen planer body is mainly used for planing large workpieces, and can also clamp multiple parts on the workbench for simultaneous processing. It is an industrial mother machine. The worktable of the gantry planer carries the workpiece through a portal frame for linear reciprocating motion, with an empty stroke speed greater than the working stroke speed. There are usually two vertical knife holders on the crossbeam, and the knife holder slide can rotate by an angle in the vertical plane and can make lateral feed movements along the crossbeam.

Longmen planer is a planer with a portal frame and a horizontal long bed. Longmen planer is mainly used for planing large workpieces, and can also clamp multiple parts on the workbench for simultaneous processing. It is an industrial mother machine. The worktable of the gantry planer carries the workpiece through a portal frame for linear reciprocating motion, with an empty stroke speed greater than the working stroke speed. There are usually two vertical knife holders installed on the crossbeam, and the knife holder slide can rotate one angle in the vertical plane and can make lateral feed movements along the crossbeam; The planer can perform vertical or diagonal feed motion on the tool holder; The crossbeam can be adjusted up and down on two vertical columns. Generally, a side tool holder that can move up and down along the two columns is also installed to expand the processing range. When the worktable returns, the tool can be lifted flexibly to avoid scratching the surface of the workpiece. The drive of the machine tool worktable can be achieved through a generator motor unit or a thyristor DC speed regulation method, with a wide speed range and the ability to obtain a large driving force even at low speeds. Some gantry planers are also equipped with milling heads and grinding heads, which can be transformed into gantry planer milling machines and gantry planer milling and grinding machines. The worktable can perform both fast main motion and slow feed motion, mainly used for planing, milling, and grinding of heavy workpieces in one installation.