China National Petroleum Corporation

Cnpc Engineering Technology R&d Company Limited

Beijing Railway Institute of Mechanical & Electrical Engineering Co., Ltd.

Zhigang Wei

Lei Wang

Peng Wang

Sha Li

Guangdan Liu

Xianwei Guo

Hengtian Jia

Shushen Zhang

Ranggao Xie

Yinghao Li

Jiajin Wang

Weiping Ai

Yanlin Li

Guizhong Yu

Xiurong Dou

Weimin Mao

Anshu Lv

Yifeng Fan

The present disclosure discloses a mud pressure wave signal modulation apparatus and method, which relate to the technical field of petroleum drilling engineering. The apparatus includes: a motor (), a valve plate (), a main control circuit (), a motor drive control circuit, and a downhole communication circuit; the valve plate () is driven by the motor () to be rotated around an axial direction perpendicular to a flow direction of drilling fluid; the motor () and the valve plate () are disposed in a drilling fluid channel (), and the drilling fluid channel (), the motor (), the valve plate (), the main control circuit (), the motor drive control circuit and the downhole communication circuit are disposed in a drill collar.

Mud pressure wave signal modulation apparatus and method

The invention discloses an under-floor lifting jack for high-speed EMU train, comprising: a main control electric part for controlling the jack, multiple bogie lifting means arranged in pits, fixed rails on the ground between adjacent pits, and body hoists movable along dedicated rails on both sides of the bogie lifting means, wherein lifting rails of the bogie lifting means and the fixed rails form continuous rails, and one or more of the bogie lifting means are set in each pit and adapted for lifting individually or synchronously in combination according to the wheel positions of different types of electric multiple unit trains under the control of the main control electric part. The invention is compatible with the maintenance of various EMU trains, thus the same lifting jack can satisfy maintenance requirements of various EMU trains, resulting in high compatibility and construction cost-reduction of the maintenance base for the EMU train.

Under-floor lifting jack for high-speed electric multiple unit trainset

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Beijing, China

Zhigang Wei