variable loop meaning in English

可变环

This drill adopts full hydraulic pressure drive , constant power variable loop , and makes drilling machine change rotary speed and increase torque automatically according to the variation of stratum in the course of engineering construction
该机采用全液压驱动，恒功率变量回路，使钻机能够在工程施工中，根据地层的变化自动改变转速增大扭矩。
The engineering drilling machine of kp2500 type is a species of full hydraulic pressure rotating plate - drilling machine developed by our company newly , this drill adopts full hydraulic pressure drive , con stant power variable loop , wheel cylinder startup and electrohydraulic multiple operation , the drill can adjust torque according to stratum situation and reduce pressure to deep drilling automatically
Kp2500型工程钻机是我公司最新研制的一种全液压转盘式钻机，该机采用全液压驱动，恒功率变量回路，分泵起动，电液复合操作，钻机能够根据地层情况调整扭矩和减压自动钻进。