The vibration hydraulic system of the double drum vibratory roller is the core of the working device, and its stability and reliability have been the focus and difficulty of the design. Vibrating hydraulic system is a process of acceleration and deceleration. If the vibration is too fast, it will cause the vibration of the vibration hydraulic system to produce very large impact load. The reliability of the system components is deteriorated,Road Cutting Machine and the service life is shortened. In the process of stopping the machine, the inertia force will also be anti-drag the engine, making the engine speed instantaneous rise, and then the engine reliability and service life. Therefore, in the design of vibration hydraulic system of vibratory roller, it is necessary to consider the influence of start and stop vibration speed on compaction quality, and the impact of impact load on machine reliability.
1. To improve the lack of pre-vibration hydraulic system In the dynamic testing of the vibratory hydraulic system of a double drum vibratory roller of our company, we found that the vibration start time is only 0.9 s, and the maximum working pressure of the vibrating hydraulic system is about 34 MPa, far exceeding The system vibration pump and vibration motor rated working pressure 23 MPa. In the process of stopping vibration, the vibration motor continues to rotate due to the inertia effect,Road Router Crack negative pressure is generated in the pipeline, and the vibration hydraulic system has the phenomenon of sucking air.
This type of double drum vibratory vibratory hydraulic system shown in Figure 1. Which is mainly composed of a vibration pump (not shown), a start-up solenoid valve, a logic combination valve and a vibration motor. When the pressure oil from the P port to enter, by Kai-off solenoid valve opening and closing to achieve the start or stop vibration. As the start-up solenoid valve action time is very short,asphalt milling machine rental resulting in the vibration system response time is very fast, the system impact is very large.
When the start-up, the start-up solenoid valve power, vibration pump pressure oil generated from the P into the mouth. Because the fluid resistance at the vibrating motor is much smaller than that at the start-up solenoid valve and the logic combination valve, a large amount of pressure oil passes through the vibrating motor under the action of the vibrating pump, thus enabling the vibrating system to start immediately. When the vibration stop,Install asphalt grooving Mechanical Parts the start-up solenoid valve power, because the logic combination of the valve opening pressure is greater than the opening pressure of the Kai vibration solenoid valve, so the pressure pump oil is not generated by the logical combination of valves (also known as cone valve) But through the solenoid valve back to T port. At this time Kai flow through the solenoid valve is very small, throttle phenomenon is very obvious, the system heat a great.
