Mine retractable energy-absorbing anti-shock viscous damping bolt and its supporting method
A viscous damping and bolt technology, which is used in the installation of bolts, mining equipment, and earth-moving drilling, etc., can solve the problems of easy-to-break anchor ends and easy-to-break bolts, and achieves reduction of damage and impact load. Effect
Inactive Publication Date: 2016-10-05
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology
The disadvantage of this design is the same as that of the above-mentioned patent. It belongs to a one-time buffer device, and the end of the anchor rod is anchored by a cylinder with an enlarged diameter.
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[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation.
[0024] like figure 1 As shown, a retractable cushioning energy-absorbing anti-shock hydraulic damping bolt for mining is composed of a pre-tightening nut 1, a tray 2, an energy-absorbing material 3, a bolt body, a backing plate 5, and a buffering energy-absorbing device. Wherein the anchor rod body is composed of the anchor rod end 4 and the anchor rod main body 14, and the pre-tightening nut 1, the tray 2, the energy-absorbing material 3 and the backing plate 5 are installed on the anchor rod end 4 in sequence; The structure of the abdication buffer energy-absorbing device is that a lower sliding piston 8, a connecting rod piston 10 and an upper sliding piston 11 are successively arranged in a buffer hydraulic cylinder 9, so that the buffer hydraulic cylinder 9 is successively spaced into A, B, C , D four cavities, the four cavit...
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The invention discloses a retractable energy-absorbing anti-shock viscous damping bolt for mining and a supporting method thereof, which consists of a pre-tightening nut, a tray, an energy-absorbing material, a bolt body, a backing plate and a buffering energy-absorbing device , the anchor body is composed of the end of the anchor rod and the main body of the anchor rod, and the pre-tightening nut, tray, energy-absorbing material and backing plate are installed on the end of the anchor rod; There are lower sliding pistons, connecting rod pistons and upper sliding pistons with 3-4 damping holes, and the damping holes on the adjacent pistons are not in a straight line; the upper and lower sliding pistons are provided with sealing rings on the surrounding surfaces; The connecting rod of the connecting rod piston passes through the upper end surface of the upper sliding piston and the buffer hydraulic cylinder and is connected with the main body of the anchor rod. The invention can maintain constant resistance in the process of resisting rock impact, and can reduce the impact load, reduce impact energy damage to the surrounding rock within the anchorage range of the bolt, and further stabilize the roof surrounding rock.
Description
technical field [0001] The invention relates to the technical field of coal mine safety support, in particular to a retractable energy-absorbing and anti-shock hydraulic damping bolt for mines and a support method thereof. technical background [0002] After the coal mining enters the deep part, under the joint action of the advanced bearing pressure and the original stress of the working face, dynamic disaster accidents such as rock burst are prone to occur in the mining roadway. At the moment when rock burst occurs, a large amount of elastic impact energy will be released in the form of waves, including both tensile impact energy and compression impact energy. The impact energy will make the surrounding rock of the mining roadway stretch and compress continuously, resulting in the deformation of the surrounding rock of the roadway, and even breaking the support system such as bolts and cables, causing the surrounding rock of the roadway to fall, causing serious casualties ...
Claims
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IPC IPC(8): E21D21/00E21D20/00
Inventor 宁建国孙赑谭云亮王俊
Owner SHANDONG UNIV OF SCI & TECH