Application of Hollow Piston Rod in Hydraulic System

Built-in fluid transmission channel to simplify system layout

The internal cavity of the hollow piston rod can be directly used as a transmission channel for hydraulic oil, coolant or lubricating oil, replacing traditional external pipelines. For example, in the clamping hydraulic cylinder of a large injection molding machine, the hollow piston rod can guide the hydraulic oil to the front end of the piston, reduce the complex arrangement of the external oil pipe, reduce the pressure drop and leakage risk of the pipeline, and shorten the oil transmission path to improve the response speed. In addition, in engineering machinery (such as the hydraulic cylinder of the telescopic arm of a crane), the hollow structure can also transport grease to the distal joint to achieve automatic lubrication and reduce the frequency of maintenance.

Lightweight design to improve dynamic performance

The hollow structure reduces the weight of the piston rod and reduces the inertia of movement, which is particularly suitable for hydraulic systems with high-frequency reciprocating motion. In metal processing equipment (such as high-speed stamping machines), lightweight hollow piston rods can enable hydraulic cylinders to start and stop quickly, reduce energy loss, and increase stamping frequency and accuracy. In hydraulic actuators in the aerospace field, the weight reduction characteristics of hollow piston rods are more critical. For example, in the aircraft landing gear retraction system, the reduction of its inertia can shorten the response time and improve flight safety.

Integrated heat dissipation and cooling function

The heating problem during the operation of the hydraulic system can be effectively alleviated by the hollow piston rod. The internal channel can introduce coolant (such as water or oil) to directly absorb the heat generated by the friction between the piston and the cylinder wall, avoiding the decrease in oil viscosity and component aging caused by overheating of the system. For example, in high-temperature environment hydraulic equipment in the metallurgical industry (such as continuous casting machine hydraulic cylinder), the cooling function of the hollow piston rod can ensure the stable operation of the hydraulic system under extreme working conditions and extend the life of the equipment.

Multifunctional application under special working conditions

In scenarios where multi-media transmission is required, the hollow piston rod can simultaneously transport hydraulic oil and control signals (such as optical fiber or cable) to achieve "mechanical, electrical and hydraulic" integrated integration. For example, in the hydraulic manipulator arm for deep-sea operations, the hydraulic oil circuit and fiber optic sensor can be arranged in parallel inside the hollow piston rod to monitor the mechanical state in the deep-sea high-pressure environment in real time and improve the operation accuracy and reliability. In addition, in medical equipment (such as the hydraulic lifting system of the operating table), the hollow structure can also be used to transport sterile media to meet the requirements of a clean environment.