Remote-controlled adjustable-speed screw drill for gas-drive hydraulic-motive during gas drilling

A remote-controlled adjustable-speed screw drill for gas-drive hydraulic-motive during gas drilling, comprising a piston speed control system, a motor assembly, a cardan shaft assembly and a transmission shaft assembly which are connected with each other from top to bottom in sequence;

• wherein:
• the piston speed control system comprises a piston speed control housing, a polymer battery pack, a remotely-controlled circuit box, a piston speed control motor and a piston speed control shaft, wherein the polymer battery pack is located at an upper portion of the piston speed control housing, both the remotely-controlled circuit box and the piston speed control motor are located at the piston speed control housing and below the polymer battery pack, the piston speed control shaft is connected with a lower portion of the piston speed control motor and extends downwardly;
• the motor assembly comprises an air inlet A, an air inlet B, a cam, an air cylinder A, an air cylinder B, a piston A, a piston B, a connecting rod, an air outlet A, an air outlet B, a liquid inlet A, a liquid inlet B, a hydraulic cylinder A, a hydraulic cylinder B, a liquid check valve A, a liquid check valve B, a liquid storage chamber, a liquid outlet A, a liquid outlet B, a liquid injecting chamber, a liquid injecting hole, an anti-drop cap, a rotor, a stator, and a motor assembly housing, wherein two bilaterally symmetrical empty cavities are provided within and at an upper portion of the motor assembly housing, the piston A and the piston B are respectively located within the two empty cavities, the piston A divides one empty cavity into an upper air cylinder A and a lower hydraulic cylinder A;
• similarly, the piston B divides another empty cavity into an upper air cylinder B and a lower hydraulic cylinder B, the upper air cylinder A is corresponding to the upper air cylinder B, the lower hydraulic cylinder A is corresponding to the lower hydraulic cylinder B, the connecting rod is located between the piston A and the piston B, both the air inlet A and the air inlet B are respectively provided above the air cylinder A and the air cylinder B, both the air outlet A and the air outlet B are respectively provided at a top of the air cylinder A and the air cylinder B, the cam, which is located between the air inlet and the air cylinder and coaxially connected with the piston speed control shaft, rotates to control an ON/OFF of the air inlet A, the air inlet B, the air outlet A and the air outlet B, the liquid inlet A and the liquid inlet B are respectively provided on a wall of the hydraulic cylinder A and the hydraulic cylinder B and are communicated with the liquid injecting chamber, a bottom of the hydraulic cylinder A and a bottom of the hydraulic cylinder B are respectively communicated with the liquid storage chamber through the liquid check valve A and the liquid check valve B, the stator, which is located at a lower portion of the motor assembly, is a pipe with helical inner holes, the rotor is located within the stator, and spirally upwardly extends to the liquid storage chamber and connects with the anti-drop cap, the anti-drop cap is threadedly connected with the rotor, an external wall of the rotor, having a helical shape, matches the inner holes of the stator, the stator is conjugatedly engaged with the rotor.