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An impact-resistant double telescopic column and its application

A double telescopic, impact-resistant technology, applied in pillars/supports, mining equipment, earthwork drilling and mining, etc., can solve the problems of reducing the active initial support force of supports, large loss of hydraulic supply pressure in pump stations, and complex liquid supply systems, etc., to achieve Avoid cylinder expansion, high safety, and the effect of improving safety

Active Publication Date: 2018-01-09
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lengthy industrial pipelines in the fully mechanized mining face, the pressure loss of the pumping station is large. Taking the pressure of the pumping station at 31.5MPa as an example, when the emulsion reaches the liquid support through the liquid supply pipeline, the pressure has generally dropped to 28MPa. Considering the stroke The opening pressure and throttling pressure loss of the one-way valve can actually reach the middle cylinder pressure can be reduced to 22MPa, which seriously reduces the active initial support force of the bracket
The existing ways to increase the initial support force of the hydraulic support are often to increase the hydraulic supply pressure of the emulsion pump station, increase the initial support force maintenance system, and increase the booster circuit of the column, etc. The emulsion pump station is restricted by factors such as the seal and the installation size of the drive motor. The existing liquid supply pressure is up to 43MPa (the cost is quite high); the addition of the initial support booster device improves the redundancy of the working face liquid supply system, making the liquid supply system more complicated
[0005] One of the key performances of the hydraulic support is the working cycle of the hydraulic support (lifting column, lowering column, active initial support, passive initial support, balance resistance, and lowering column). The ability to quickly lift the column can shorten the cycle period of the hydraulic support and improve The self-moving speed and automatic follow-up speed of the hydraulic support can improve the mining efficiency of the fully mechanized mining face. The current increase of the column lifting and lowering speed is usually achieved by increasing the diameter of the column inlet and outlet, but this method is limited by the pump. station pressure and pipeline layout, with great limitations

Method used

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  • An impact-resistant double telescopic column and its application
  • An impact-resistant double telescopic column and its application
  • An impact-resistant double telescopic column and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as Figure 1 to Figure 4 As shown, the present embodiment provides an impact-resistant double telescopic column, including a first-stage cylinder 24, an isolation cylinder 39, a movable cylinder 28 and a movable middle rod 10 nested sequentially from outside to inside, and the top of the movable middle rod 10 is provided with an upper Piston 40, bottom end is provided with lower piston 26, and the bottom end of isolation cylinder 39 is welded together with lower piston 26, and upper piston 40 is positioned in movable cylinder 28, and lower piston 26 separates the first-stage cylinder cavity into the first-stage cylinder upper cavity and the lower chamber of the first-stage cylinder, the upper piston 40 separates the inner cavity of the movable cylinder into the upper chamber of the movable cylinder and the lower chamber of the movable cylinder, and the bottom of the first-stage cylinder 24 is provided with a liquid inlet 35 and a safety port connected to the lower c...

Embodiment 2

[0051] Such as Figure 5 As shown, a hydraulic system containing impact-resistant double-telescopic columns includes the impact-resistant double-telescopic columns as described in Embodiment 1, the first spherical shut-off valve 21, the second spherical shut-off valve 20, and the three-position four-way electro-hydraulic reversing Valve 22, hydraulic control one-way valve 23, primary cylinder safety valve 27, anti-expansion safety valve 29, four-position two-way electro-hydraulic reversing valve 31 and movable cylinder safety valve 30; liquid inlet 35 is sequentially connected to hydraulic control one-way valve 23. The three-position four-way electro-hydraulic reversing valve 22, the first spherical stop valve 21 and the liquid inlet pipe 18, the liquid outlet 34 and the liquid return port 33 of the movable cylinder are sequentially connected to the three-position four-way electro-hydraulic reversing valve 22, the second spherical The stop valve 20 and the liquid outlet pipe 1...

Embodiment 3

[0053] A method of using the hydraulic system containing the impact-resistant double telescopic column described in embodiment 2, the process is as follows,

[0054] (1) The process of raising and lowering columns:

[0055] Slow column lift: Open the three-position four-way electro-hydraulic directional valve 22 to the right, the four-position two-way electro-hydraulic directional valve 31 to the left 1 position and the first spherical stop valve 21 on the liquid inlet pipe 18, and the emulsion flows from the liquid inlet pipe 18 enters the lower cavity of the primary cylinder through the first spherical stop valve 21, the three-position four-way electro-hydraulic reversing valve 22, the hydraulic control check valve 23, and the liquid inlet 35 in sequence. At this time, the stroke check valve 25 is not opened. As the pressure of the emulsion rises, the movable middle rod 10 protrudes outward. When the lower piston 26 touches the first-stage cylinder guide sleeve 14, the movab...

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Abstract

The invention relates to an anti-impact double-telescopic stand column and application thereof. The anti-impact double-telescopic stand column comprises a first-grade cylinder, an isolation cylinder, a movable cylinder and a movable middle rod, which are sequentially embedded from outside to inside, wherein a liquid outlet communicated with an upper cavity of the first-grade cylinder is formed in the top of the first-grade cylinder; a liquid returning hole communicated with a lower cavity of the first-grade cylinder is formed in the top of the movable cylinder; an oil through passing cavity communicated with the lower cavity of the first-grade cylinder and the upper cavity of the movable cylinder is formed in the movable middle rod; a travel check valve for opening and closing the oil through passing cavity is arranged at the bottom of the oil through cavity. By replacing a traditional second-grade cylinder with the movable middle rod, the anti-impact performance of the stand column is improved; meanwhile, a safety hole and an anti-expansion hole are additionally formed in the first-grade cylinder and a control hole is additionally formed in the movable cylinder, so that the movement states of the isolation cylinder and the movable cylinder in a telescopic process are adjusted, the column can be rapidly raised and descended and high-initiative primary supporting force can be provided; meanwhile, a cylinder expansion phenomenon in an operation process of the double-telescopic stand column can be avoided, so that the safety of the operation process of the double-telescopic stand column is greatly improved.

Description

technical field [0001] The invention relates to an impact-resistant double-telescopic column and its application, in particular to a double-telescopic column for underground mining hydraulic support, which belongs to the technical field of hydraulic support. Background technique [0002] As the most important support equipment in the fully mechanized mining face, the hydraulic support is responsible for balancing the roof pressure, supporting the working face, isolating the goaf, and maintaining the safe working space of the stope. With the continuous development of high-efficiency fully-mechanized mining technology in working faces in recent years, the full-height mining method of single-mechanized mining has gradually become the mainstream direction of thick coal seam mining due to its high resource recovery rate, high coal quality, and high efficiency. The direction of protection height and high working resistance is developed. Double telescopic hydraulic cylinders (colu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D15/44E21D15/51
CPCE21D15/44E21D15/45
Inventor 曾庆良孟昭胜孔帅杨扬万丽荣刘鹏姜考芦艳洁王庆友
Owner SHANDONG UNIV OF SCI & TECH
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