Abstract
In view of the shortcomings of traditional hydraulic support system, such as poor mobility and limited range of adjustment, a new configuration with double parallelogram structure is proposed. Combining the kinematic diagram of the mechanism of the new support system and the relevant parameters of the balance moment, using the kinematic vector closed-loop modeling method and D’Alembert’s principle, the relationship equation between the generalized coordinates of the hydraulic support and the geometric position parameters is obtained, and the analysis model with plural-freedom is established. Dynamic response characteristics and natural frequencies of column hydraulic cylinder and balance hydraulic cylinder are analyzed. The results demonstrate that the natural frequencies of the improved balance hydraulic cylinder and column hydraulic cylinder have been greatly improved, and the safety performance of the hydraulic support has been greatly increased.
Highlights
As a key device for supporting the top beam and maintaining the safe production in the stope, the hydraulic support can be considered as a complex system that interacts with the surrounding rock.[1,2]
Yang et al.[4] designed a new hydraulic support based on the kinematics modeling and simulation of the mechanism analysis of the bracket
When the dynamic model is established, the length of balance hydraulic cylinder l4 and column hydraulic cylinder l8 is selected as the generalized coordinates
Summary
As a key device for supporting the top beam and maintaining the safe production in the stope, the hydraulic support can be considered as a complex system that interacts with the surrounding rock.[1,2] The stress state of the hydraulic support depends on the relationship between the external mine pressure and the internal forces.[3]. The piston of the column hydraulic cylinder moves and supports the top beam. During the coal mining process, the piston’s movement of column hydraulic cylinder causes the top beam to be supported.
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