Adaptability Analysis of Four-Leg Hydraulic Support with Large Mining Height under Impact Dynamic Load

Abstract

In order to comprehensively analyze the adaptability of four-leg hydraulic support with large mining height under impact dynamic load, this paper adopts HyperMesh software to conduct a flexible pretreatment for the top beam, shield beam, and front and rear rods. The numerical simulation model of four-leg hydraulic support is established with ADAMS, where variable stiffness spring is used to replace columns to simulate their elastic characteristics. Building on analysis of the specific parameters of the support, this paper attempts to study the adaptability of the hydraulic support with impact dynamic load acting on the top beam. Additionally, the impact coefficient I and the excitation coefficient E have been introduced to transform the analysis results and optimize the evaluation method of the response degree of the top beam under impact load. Consequently, the response characteristics of the columns and pins at the hinged joints under various coupling states of the surrounding rock are found. Meanwhile, the paper has made a detailed comparison on the stress state of hydraulic support with different impact loads acting on the top beam. The adaptability change rule of the impact dynamic load under various impact conditions has been explored, which is of great significance to the optimization and strength design of four-leg hydraulic support with large mining height.

Research on Dynamic Characteristics of Canopy and Column of Hydraulic Support under Impact Load

“…It can be seen from Figure 5a that when the impact load moves along the positive direction of the X-axis, the impact response coefficient of the hinge point of the front column shows an increasing trend, and the column will have obvious the eccentric load effect. The analysis of reference [8] also supports this result. The closer to the origin direction, the smaller the eccentric load effect of the column is.…”

“…By Equation (7), the equivalent stiffness k is of the i stage cylinder block can be defined as Equation (8):…”

“…Scholars have carried out many studies on the response law of hydraulic support under impact load. Wang et al [8] studied the impact dynamic load adaptability of hydraulic support when impact load acted on canopy and caving beam by numerical simulation, and summarized the adaptability of hydraulic support under different impact loads. Ren et al [9] proposed a monitoring scheme for the dynamic response of hydraulic support, carried out multi-scale impact tests on hydraulic support, and verified the test data and simulation data by combining them with numerical simulation; the results showed that the impact resistance of hydraulic support depended largely on the initial support condition.…”

Simulation Research on Impact Contact Behavior between Coal Gangue Particle and the Hydraulic Support: Contact Response Differences Induced by the Difference in Impacted Location and Impact Material

“…Xie et al [ 13 ] studied the load-bearing characteristics of the top beam in a full range by constructing the spatial mechanical model of the top beam separation body of the four-column support. Wang et al [ 14 ] established the plane mechanics model of four-column supporting shield support to study its adaptation. Ren et al [ 15 ] designed the 1:2 reduced-scale hydraulic support to carry out the dynamic impact test and to study the response characteristics of hydraulic support under dynamic impact load.…”

Investigation of Dynamic Behaviour of Four-Leg Hydraulic Support under Double-Impact Load

“…By applying concentrated impact load to the canopy of the shield support of the experimental test bed and numerical simulation model, respectively, the energy transfer and dissipation characteristics of the two-leg support system are studied. To obtain the adaptability of fourleg hydraulic support with large mining height, Wang et al [29] applied different impact loads to the canopy and goaf shield respectively, and the evaluation method of the canopy and goaf shield under impact is obtained.…”