Xuzhou Xugong Foundation Construction Machinery Co., Ltd.

Zhonghai Zhang

Jiguang Zhang

Ming Li

Yonghua Zhang

Weixiang Lv

Ju Luo

Li Zhang

Peng Wang

Changjian Qin

Jinlong Lu

Jingwei He

Xiaoliang Li

Caifeng Wei

A push-pull force control method for a horizontal directional drilling machine with the following steps is provided. According to a correspondence relationship between a motor displacement and a maximum push-pull force of a drilling machine, the motor displacement is first adjusted, so that the required push-pull force can be obtained through the adjustment of the subsequent steps. Then, an oil feeding pressure of the motor is controlled according to a relationship between the push-pull force and the working pressure difference of the motor. Finally, the push-pull force of the motor is controlled in real time according to the oil feeding pressure of the motor to be equal to the required push-pull force value.

Push-pull force control method for horizontal directional drilling machine and horizontal directional drilling machine

A detachable and combined drive key of a power head of a rotary drilling rig is provided. The drive key includes torque transfer keys and a pressure transfer key. Each torque transfer key is respectively assembled on a key groove on an inner wall of the drive sleeve. The pressure transfer key is assembled at a bottom of a drive sleeve and includes a circular ring structure and a plurality of pressure pads. Each pressure pad has a width less than the torque transfer key. A central surface of each pressure pad is aligned with a central surface of each torque transfer key. The drive sleeve, the torque transfer keys, and the pressure transfer key are combined to form an integrated drive key with a same circular cross-section.

Detachable combined-type drive key for rotary drilling rig power head

Growing community of inventors

Xuzhou, China

Zhonghai Zhang