Excavators are among the most widely used construction machines worldwide. With an upper structure that can rotate continuously relative to the undercarriage, reliable transmission of power, signals, and fluids is essential. Slip rings play a critical role in enabling this rotation while ensuring stable system operation.
In most excavators, the primary slip ring solution is the gas-liquid slip ring. Installed on the undercarriage, these slip rings work together with hydraulic piston pumps to transmit high-pressure hydraulic oil during continuous slewing operations. To withstand demanding working conditions, gas-liquid slip rings are typically manufactured from high-strength stainless steel, ensuring excellent pressure resistance and long service life. Depending on the excavator’s tonnage and power requirements, the number of fluid channels and passage sizes can be customized accordingly.
As a professional slip ring manufacturer, JINPAT has an experienced engineering team dedicated to construction machinery applications. JINPAT gas-liquid slip rings are not only widely used in standard excavators, but also in specialized rotating equipment such as grapple excavators and other modified machines that replace buckets with functional attachments. These machines share the same requirement for continuous hydraulic transmission through fully rotating structures.
Modern excavators are primarily hydraulically driven, making gas-liquid slip rings the mainstream solution. However, in compact and mini excavators, electric slip rings are also commonly used to transmit power and control signals.
JINPAT has developed multiple electric slip ring models specifically for small and medium excavators. To adapt to harsh construction environments, these slip rings feature anti-vibration internal structures and high-strength steel housings similar to those used in hydraulic slip rings. They are capable of transmitting throttle signals, CAN bus signals, angle sensors, and encoder signals with high reliability.
In addition to standalone solutions, JINPAT also offers gas-liquid-electric integrated slip rings, combining hydraulic, pneumatic, and electrical transmission in a single compact unit. This integrated design simplifies system architecture and improves overall equipment reliability.
With increasingly strict global emission regulations, electrification is becoming a clear trend in the construction machinery industry. In this context, integrated slip rings and high-current slip rings are gaining greater market potential. Some manufacturers are replacing diesel engines with external electric power systems, using armored cable reels to supply energy. In these systems, the slip ring is integrated inside the cable reel, enabling continuous current transmission during equipment movement.
Leveraging long-term experience in heavy-duty slip ring design, JINPAT continues to provide reliable, customized slip ring solutions for excavators and other construction machinery, supporting both traditional hydraulic systems and future electrified platforms.
