1. The number of working tongs and safety tongs is equal (9000 meters and 12000 meters are the same). The braking torque of working tongs and safety tongs meet the requirements of the maximum braking torque of the rig123.net' target='_blank'>drilling rig (both higher than the requirements of the national standard for the working braking torque). The emergency braking composite torque is larger, which avoids the small number of safety tongs (parking tongs). In case of emergency braking, the working tongs are general. The brake lag is more, but the brake torque of safety tongs is less, and the accidents of drilling and slipping are frequent.

 

2. Using the advanced experience of foreign countries for reference, the circuit control of electronic brake handle adopts the electronic control air valve air valve to control the hydraulic reversing valve to realize the control of the brake caliper work, avoiding the accident caused by the valve stuck due to the large electromagnetic power of the hydraulic reversing valve and the large heat output.

 

3. The double safety design is adopted in the control circuit of the safety gear. The hydraulic reversing valve is set as one opening and one closing, i.e. one operation and one standby. When braking, it works at the same time, avoiding the accident caused by the valve heating or the particle stuck in the oil.

 

4. The hydraulic station is equipped with a hand pump, which can ensure that the disc brake can work normally at any time under the condition of power failure and air failure.

 

5. The hydraulic station is equipped with oil filling and self circulation filtering device, which can prevent the oil pollution of the hydraulic system and minimize the occurrence of faults and accidents.