From the area curve, it can be seen that 05mm is the starting acceleration and braking deceleration stage of the motor, and this section directly affects the starting and braking performance of rotation, so it should be more important to study the performance of this section. Because the displacement of 4mm and 5mm spool is the turning point of valve port area curve, the calculation model of flow field with spool displacement of 4mm and 5mm is taken for simulation analysis in this chapter.
In order to obtain the variation curve of axial force and lateral force of excavator multi-channel valve with displacement, the rotary joint of excavator multi-channel valve is modeled and meshed under the condition of left-right movement of valve core and different displacement, and then the flow field is simulated to obtain the axial force and lateral force of each movement of valve core of excavator multi-channel valve rotary joint. According to the structural parameters of the multi-channel valve rotary joint throttling groove of the digger and the displacement of different main valve cores, a variety of numerical analysis models are established. Due to too many models, some model parameters are listed in table 41.
Numerical analysis of flow field in rotary valve core of multi-channel valve of excavator
Calculation model and boundary conditions Figure 4-1 shows the calculation model and meshing model of the flow field of the rotary coupling valve core of the multi-channel valve of the excavator moving to the right 4mm, and the local grid is enlarged for easy observation (other models are similar). In addition, the geometric model omits the fillet of the undercut groove of the valve body. Due to the symmetrical structure, only half of the flow channel needs to be modeled and meshed. The pressure and velocity gradient in the valve port and its outlet cavity are large, and there are vortex flow patterns. Local mesh refinement is adopted, and coarse mesh is adopted for others.
