Large arm guide device for underground diaphragm wall one-step forming machine

The invention relates to engineering machinery and discloses a large arm guide device for an underground diaphragm wall one-step forming machine. The large arm guide device is a special part for the 'underground diaphragm wall one-step forming machine' (notification number CN101619573 B). Four guide devices in two groups are mounted at the upper and lower ends of a large arm undercarriage respectively. The large arm guide device comprises a box and guide wheel components; the box is formed by welding of a bottom plate and four vertical plates, vertical rib plates, transverse rib plates and reinforcement plates are arranged in an inner cavity of the box, and the bottom plate is mounted on the large arm undercarriage; the guide wheel components include front guide wheel components and lateral guide wheel components, the front guide wheel components are mounted on the front surface of the box, the lateral guide wheel components are mounted on the lateral side of the box, each front guide wheel component comprise