TBM experiment table thrust hydraulic system capable of conforming sudden-change load

Abstract

The invention discloses a TBM (Tunnel Boring Machine) experiment table thrust hydraulic system capable of conforming sudden-change load. The TBM experiment table thrust hydraulic system comprises a high-pressure oil source, a low-pressure oil source, a high-pressure control oil passage, a low-pressure control oil passage and an inlet and outlet oil passage comprising four thrust hydraulic cylinders in parallel connection. One end of the high-pressure control oil passage and one end of the low-pressure control oil passage are respectively connected with the respective high-pressure oil source and low-pressure oil source, and the other end of the high-pressure control oil passage and the other end of the low-pressure control oil passage are respectively connected with rod cavities and rodless cavities of the four thrust hydraulic cylinders in parallel connection. The low-pressure oil passage is used for controlling rapid thrust and rapid reset process of a TBM experiment table; the high-pressure oil passage is used for controlling high-pressure thrust and back-off process of the TBM experiment table. Under the working condition of normal thrust, each thrust hydraulic cylinder can realize the switching of the control mode of a proportional pressure reducing valve and the control mode of a proportional one-way throttle valve and a proportional overflow valve; under the control mode of the proportional one-way throttle valve and the proportional overflow valve, the sudden-change load encountering during the thrust process can be conformed in combination with an energy accumulator connected to the rodless cavity of the thrust hydraulic cylinder, and thus instant pressure impact is buffered, and the service life of a hydraulic element of the system is prolonged.

Description

technical field [0001] The invention relates to a propulsion hydraulic system, in particular to a propulsion hydraulic system of a TBM test bench adapting to abrupt loads. Background technique [0002] Hard rock tunnel boring machine (TBM for short) is a highly intelligent tunnel construction major technical engineering equipment that integrates machinery, electricity, hydraulics, light, and computers. In developed countries, the construction of tunnel boring machines has accounted for more than 90% of the total tunnels. With the rapid development of China's national economy and the continuous acceleration of domestic urbanization, China's urban subway tunnels, hydraulic tunnels, cross-river tunnels and railway tunnels will require a large number of tunnel boring machines. [0003] The TBM propulsion system mainly has the functions of providing high-pressure thrust when the cutter head breaks rocks, providing retreat force when the cutter head is retreating, realizing rapid...

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Problems solved by technology

[0005] In order to overcome the problem that the existing TBM propulsion hydraulic system cannot well adapt to abrupt loads and large eccentric loads, and at the same time meet the requirements of hard rock excavation construction, the purpose of the present invention is to provide a TBM test bench propulsion hydraulic system that adapts to abrupt loads. system, under normal propulsion conditions, each propulsion hydraulic cylinder can switch between the control mode of proportional pressure reducing valve and the control mode of proportional one-way throttle valve plus proportional overflow valve; In the control mode, the composite control of propulsion pressure and flow is realized, combined with the accumulator connected to the rodless chamber of the propulsion hydraulic cylinder, it can adapt to the sudden load and large eccentric load encountered in the propulsion process, thereby buffering the instantaneous pressure shock and extending the system Service life of hydraulic components

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