Method for determining support radius and tool quantity of full face rock tunnel boring machine cutter head
A full-section, roadheader technology, used in culvert excavation tools, road and bridge fields, can solve problems such as the impact of full-section rock roadheaders on operating performance
Active Publication Date: 2017-01-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
[0002] The cutterhead is the key core component of the full-face rock boring machine, which has a great influence on the operating performance of the full-face rock boring machine, especially the relationship between the setting of the cutterhead support radius and the number of disc-shaped hobs on the cutterhead, and the influence on the warping of the cutterhead. , vibration and its maximum bearing life have a major impact, and there is no effective solution at present
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[0159] It is known that the excavation diameter of a tunnel project is 7.66m. According to the geological conditions of the surrounding rock, 56 disc-shaped hobs need to be installed on the cutter head of the full-face rock tunneling machine.
[0160] but:
[0161] According to patent requirements, 1) take R 0 =2.36(m), then:
[0162] 2) Set 28 disc-shaped hobs within the support radius of the cutter head, and 28 disc-shaped hobs outside the support radius of the cutter head.
[0163] According to the numerical simulation and test results, during the rock-breaking operation of the full-face rock boring machine, the warpage of the cutter head is reduced by nearly 25% compared with the cutter head designed by the traditional design method, and the amplitude and frequency are respectively reduced by 27% and 23%. Large bearing life increased by nearly 13%.
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The invention discloses a method for determining support radius and tool quantity of a full face rock tunnel boring machine cutter head and belongs to tools for digging water conservancy and hydro-power tunnels, railway and road tunnels and urban subways. Equivalent loads of the cutter head in tunneling operation are uniformly distributed and supported on an elastic sheet on an anti-thrust bearing; according to an elastic mechanics theory, a differential equation of an elastic curved surface bent by a thin circular plate, and support relation of cutter head surface loads and the cutter head, the quantity of cutters in the cutter head support radius and the quantity of cutters beyond the support radius are determined by analyzing partial cutter head boundary conditions in the bearing and internal bearing force on the boundary; under the same quantity of cutters, the cutter head has better operating efficiency. In an embodiment, by the method, when the full face rock tunnel boring machine breaks rocks, the cutter head warping degree is reduced approximately by 25%, the amplitude and the frequency are respectively declined to 27% and 23%, and the service life of the large bearing of the cutter is increased approximately by 13%.
Description
technical field [0001] The invention belongs to the scope of excavating tools for roads, bridges and culverts, in particular to a method for determining the support radius and number of cutters of a full-face rock boring machine cutter head. Background technique [0002] The cutterhead is the key core component of the full-face rock boring machine, which has a great influence on the operating performance of the full-face rock boring machine, especially the relationship between the setting of the cutterhead support radius and the number of disc-shaped hobs on the cutterhead, and the influence on the warping of the cutterhead. , vibration and its maximum bearing life have a major impact, and there is currently no effective solution. Contents of the invention [0003] The purpose of the present invention is to propose a method for determining the number of cutting tools and the support radius of the cutter head of a full-section rock excavator. The front of the cutter head of...
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IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 张照煌龚国芳高青风孙飞
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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