The single hydraulic prop is a constant-resistance single hydraulic prop for external supply. It can be used with various top beams and can also be used as the main pillar. It can be used for the support roof of the blasting working face, and can also be used for other temporary support.
The single hydraulic prop for the external supply of constant resistance type single hydraulic prop, it can be matched with various top beam, can also make use of column. For the blasting mining face supporting the roof, also can do other temporary supporting the use of .
The single hydraulic prop is suitable for inclined coal seam mining face with coal seam inclination angle less than 25 ° -35 °. The adaptable coal seam roof and floor conditions are: backward roof does not affect the recovery of the pillar, the floor should not be too soft, and the pillar is pressed into the floor without depth Deteriorate the integrity of the bottom plate, otherwise the base should be enlarged.
The single hydraulic prop for coal seam dip angle is less than the inclined coal seam mining working face 25 degrees --35 degrees, the adaptation of the coal seam roof and floor conditions is: the roof behind does not affect the pillar recovery, the bottom should not be too soft, integrity pillar pressure into the floor depth is not degraded plate should be added, or large base.
When the coal is used in a softer blasting working face, protective measures are taken on the surface of the coating of the live cylinder to prevent collapse. When the pillar is matched with the wooden top beam or used as a point column, the top cover should be replaced with a column cap to avoid damage to the wooden beam.
Within the mining face in coal more loose cannon, to take measures to protect the active column body surface coating, to prevent the collapse. Pillar and the wooden bar with or do some column when in use, should be changed into the column top hat, so as not to damage the wooden beams.
Pillar according to liquid and liquid, divided into the external supply of liquid type (referred to as the external injection type) and for the liquid type (referred to as the injection type) pillar.
According to different pillar working stroke, divided into single telescopic (Dan Hangcheng) and the double telescopic prop (Shuang Hangcheng) pillar, in does not indicate the travel characteristic, for single telescopic prop.
The pillar by the use of different materials, is divided into ordinary steel pillar, the pillar of high titanium alloy, aluminum alloy, stainless steel pillar pillar, in does not indicate the material characteristics, is a steel pillar.
Pillar can be divided into piston plunger suspension pillar and pillar two categories according to the structure form. Piston type pillar according to the working stroke is divided into single and double telescopic prop expansion. Plunger suspension strut using water medium, which belongs to the "environmentally friendly "pillar.
Each specification can replace 2-4 specifications of traditional piston type monolithic pillars, which reduces the frequency of changing different types of monolithic pillars due to changes in the height of the working face and the movement of the roof and floor of the roadway, reducing the labor intensity of workers. And additional spare number of pillars.
The pillar has no load-bearing welds. At the same time, the pillar adopts the principle of suspension technology. The suspension force generated by the high-pressure liquid directly acts on the end of the top cover to reach four-fifths of the working resistance. The force on the pillar is only one-fifth, which greatly improves the pillar. Support stability and eccentric load capacity.
Due to the structural improvement, the situation of false jacking and detachment of the pillar due to internal leakage is avoided. Once the pillar leaks, it can be checked directly with the naked eye at the underground site, and the pillar can be replaced at any time; the principle of seal compensation and seal tightening technology is adopted , The greater the top plate pressure, the tighter the sealing surface fit, the less likely it is to leak.
The overall structure is simple and the service life is long; it is easy to operate and easy to maintain, and it can greatly reduce the rate of jack-up and maintenance.
|Distance from valve to top beam||mm||250||527||267||132|
|Pumping station pressure||Mpa||15-20|
|Lifting speed||mm / s||≥60|
|Drop speed||mm / s||≥40|
|Working medium||2% emulsion|
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