Abstract: Power equipment, a driving device of trench cutter, and a trench cutter are disclosed. The power equipment comprises a motor, a motor installation seat with an inner cavity having a first installation hole and a second installation hole in respective ends, and a transmission shaft. The motor, at the upper part of the seat, is sealingly connected with the seat. A motor output shaft extends into the inner cavity through the first installation hole. One end of the transmission shaft extends into the inner cavity through the second installation hole and is drivingly connected with the motor output shaft. The middle part of the transmission shaft and the second installation hole are sealingly connected; the other end of the transmission shaft extends from the second installation hole. A motor oil drainage cavity can be sealed by sealing the seat without changing the structure of the motor without a lip seal.

Abstract: A self-contained pressure compensation system and a control method thereof are provided, wherein the self-contained pressure compensation system comprises an oil supply device, a pressure compensation device, a power unit associated with the pressure compensation device, and a switch control device, the pressure compensation device supplies oil to the power unit and detects a change in a chamber pressure of itself in real time, the switch control device triggers the oil supply device to supply oil to the pressure compensation device if the chamber pressure is less than a predetermined first threshold and triggers the oil supply device to stop supplying oil to the pressure compensation device if the chamber pressure is greater than a predetermined second threshold. The invention can detect a chamber pressure of the pressure compensation device in real-time and can achieve automatic oil refilling, and can provide pressure compensation for the power unit effectively.

Abstract: A self-contained pressure compensation system and a control method thereof are provided, wherein the self-contained pressure compensation system comprises an oil supply device, a pressure compensation device, a power unit associated with the pressure compensation device, and a switch control device, the pressure compensation device supplies oil to the power unit and detects a change in a chamber pressure of itself in real time, the switch control device triggers the oil supply device to supply oil to the pressure compensation device if the chamber pressure is less than a predetermined first threshold and triggers the oil supply device to stop supplying oil to the pressure compensation device if the chamber pressure is greater than a predetermined second threshold. The invention can detect a chamber pressure of the pressure compensation device in real-time and can achieve automatic oil refilling, and can provide pressure compensation for the power unit effectively.

Abstract: Power equipment, a driving device of trench cutter, and a trench cutter are disclosed. The power equipment comprises a motor, a motor installation seat with an inner cavity having a first installation hole and a second installation hole in respective ends, and a transmission shaft. The motor, at the upper part of the seat, is sealingly connected with the seat. A motor output shaft extends into the inner cavity through the first installation hole. One end of the transmission shaft extends into the inner cavity through the second installation hole and is drivingly connected with the motor output shaft. The middle part of the transmission shaft and the second installation hole are sealingly connected; the other end of the transmission shaft extends from the second installation hole. A motor oil drainage cavity can be sealed by sealing the seat without changing the structure of the motor without a lip seal.