An active multi-stage frequency conversion external pressure yielding device
An active and outer hoop technology, used in shaft equipment, bolt installation, shaft lining, etc., can solve the problems of multiple support and repair of roadways, and achieve the effect of simple manufacturing process and avoiding in-hole processing.
Active Publication Date: 2020-05-05
CHNA ENERGY INVESTMENT CORP LTD +1
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Problems solved by technology
[0006] Based on this, it is necessary to provide an active multi-stage frequency conversion external pressure relief device in view of the fact that the existing technology does not solve the problem of multiple support and multiple repairs in the roadway.
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[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0020] Such as figure 1 Shown is a schematic structural diagram of an active multi-stage frequency conversion external pressure relief device of the present invention, including: an inner steel pipe 2 and an outer steel pipe 1, the assembly end 21 of the inner steel pipe 2 is inserted into the assembly end 11 of the outer steel pipe 1 and fixed , the inner steel pipe 2 is provided with a plurality of outer hoops 3 surrounding the outer pipe wall of the inner steel pipe 2 and having different shear strengths.
[0021] Specifically, figure 1 The outer hoop 3 includes a plurality of outer hoops, and the shear strength of each outer hoop is different, thereby forming a multi-stage yielding pressure. The active multi-stage frequency conversion external pressure relief device of the present invention can be applied to the surrounding rock...
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The invention discloses an active multi-stage variable-frequency outward yield device. The active multi-stage variable-frequency outward yield device comprises an inner steel pipe and an outer steel pipe. The assembly end of the inner steel pipe is sleeved with and fixed to the assembly end of the outer steel pipe, and the inner steel pipe is provided with a plurality of outer pipe walls surrounding the inner steel pipe and is provided with outer hoops with different shearing strength. According to the active multi-stage variable-frequency outward yield device, the inner steel pipe is provided with the outer hoops with the different shearing strength, so that step-by-step yield is achieved, and therefore the device can automatically change the yield resistance value and multi-stage yield deformation according to the surrounding rock pressure and deformation; and the problems that current support deformation is limited by the material property, and a current supporting product is single in load yield are solved.
Description
technical field [0001] The invention relates to the related technical field of roadway support, in particular to an active multi-stage frequency conversion external pressure relief device. Background technique [0002] For coal mine roadway support, with the increase of mining depth, more and more mines have entered deep mining, and the problem of "three highs and one disturbance" has become increasingly serious. The surrounding rock of the roadway has impact phenomenon and rheological characteristics. For some mines, almost 90% of the roadways have to be repaired 3-4 times a year, which greatly increases the production cost, seriously restricts the normal production continuity of the mine, and poses a huge threat to the safe and efficient production of coal mines. The original technical methods have been unable to solve these problems. In order to solve this problem, many experts and scholars have proposed a variety of technical methods. For example, in the secondary sup...
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IPC IPC(8): E21D21/00E21D11/00
CPCE21D11/00E21D21/00
Inventor 常博刘昆轮陈建强来兴平张玉江
Owner CHNA ENERGY INVESTMENT CORP LTD