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液压支架

Overview of hydraulic support

Hydraulic support is a structure used to control the mine pressure on the coal mining face. The mining surface pressure acts on the hydraulic support in the form of external load. In the mechanical system where the hydraulic support interacts with the surrounding rock of the mining face, if the combined force of the supporting members of the hydraulic support and the external load combined force of the roof on the hydraulic support is exactly the same line, the hydraulic support is very suitable for the surrounding rock of the mining face .

Composition of hydraulic support

The hydraulic support is composed of the main parts such as the top beam, the base, the cover beam, the column, the pushing device, the operation control system and the like.

Use of hydraulic support

In the coal production process of the coal mining face, in order to prevent the roof from falling and maintain a certain working space, to ensure the safety of workers and normal work, the roof must be supported, and the hydraulic support is powered by high-pressure liquid. The equipment for supporting and controlling the top plate composed of hydraulic components and metal components can realize a complete set of procedures such as support, top cutting, moving the frame and moving the conveyor. Practice shows that the hydraulic support has the advantages of good support performance, high strength, fast moving frame speed, safety and reliability. Hydraulic support can be combined with curved conveyors and shearers to mechanize coal mining equipment. Its application is an indispensable and effective measure to increase the output of coal mining face, improve labor productivity, reduce costs, reduce labor and ensure safe production. Hydraulic support is the main equipment that is technically advanced, economically reasonable, safe and reliable, and is indispensable for the comprehensive mechanization and automation of coal mining.

液压支架工作环境

Working principle of hydraulic support

The hydraulic support must have four basic actions of raising, lowering, pushing, and moving during the working process. These actions are performed by using high pressure emulsion provided by the pump station through several hydraulic cylinders with different working properties.

Lifting column: When the hydraulic support is needed to lift and support the top plate, the high-pressure emulsion enters the lower piston cavity of the column, and the other cavity returns to the liquid, pushing the piston to rise.

Descending column: When the descending column is needed, the high-pressure emulsion enters the upper piston cavity of the column, and the other cavity returns to the liquid, pushing the piston down, and the top beam comes out of contact to contact the top plate.

Moving the support and the conveyor forward: The moving of the support and the conveyor is done by the pushing jack on the base. When the bracket needs to be moved forward, the column is first unloaded, and then the high-pressure liquid enters the piston rod cavity that moves the jack, and the other cavity returns to the liquid. The conveyor is used as the fulcrum, and the cylinder is moved forward to pull the entire bracket to the coal wall. When the conveyor is pushed, after the support supports the top plate, the high-pressure liquid enters the lower cavity of the pushing jack, and the other cavity returns to the liquid. With the bracket as the fulcrum, the piston rod is extended to push the conveyor toward the coal wall.

When the support column works, the change of its supporting force with time can be divided into three stages: when the support column is lifted, high pressure liquid enters the lower cavity of the column, the column rises to make the top beam contact the top plate, and the pressure in the lower cavity of the column increases. At the working pressure of the station, the pumping station is automatically unloaded, the hydraulic control check valve of the bracket is closed, and the pressure in the lower cavity of the column reaches the initial supporting force. The pressure increases until the pressure of the bracket safety valve is adjusted, and the pressure in the lower chamber of the column reaches the working resistance. This stage is the phase of increasing resistance. As the pressure of the top plate continues to increase, it is the time when the pressure in the lower chamber of the column exceeds the pressure of the safety valve. When the safety valve opens to overflow and the column shrinks, the pressure on the top plate decreases and the pressure in the lower cavity of the column decreases. When it is lower than the pressure adjustment value of the safety valve, the safety valve stops overflowing, so under the limit of the pressure adjustment of the safety valve, the pressure The curve changes in a wave shape with time, and this stage is a constant resistance stage.

Classification of hydraulic support

Support type hydraulic support: The support is a two-type rack type stacking type support and a section type support.
The support hydraulic support has a long front beam, a large number of pillars and a vertical distribution. The stability of the bracket is ensured by the resetting device of the pillar. Therefore, the base is relatively sturdy. It depends on the support of the pillars and the top beam to control the working surface roof and maintain the working space. The roof rock was cut off at the rear of the roof beam. This type of bracket has large supporting capacity and good stability performance, and is suitable for coal seams with hard and complete roofs, obvious or strong periodic pressure, and hard floors.

支撑式液压支架类型

a. Stack type hydraulic support b. Section hydraulic support

Cover type hydraulic support: cover type hydraulic support has two types : legged and non-legged
The top beam of the shielded hydraulic support is short and has a uniform acting force on the top shift; the structure is stable, and the ability to resist direct top level movement is strong; the protective performance is good, the range of height adjustment is large, and the adaptability to changes in coal seam thickness is strong; Small, small ventilation resistance, small working space. This type of support is suitable for directly or unstable coal seams.

掩护式液压支架类型

a. Legged hydraulic bracket
b. Non-legged hydraulic support on the column on the shield beam
c. Non-legged hydraulic support on the top post

Support shield type hydraulic support: It is a type of frame developed on the basis of support type hydraulic support and cover type hydraulic support.
The support and shield type hydraulic support retains the advantages of the support type with high support force, good cutting performance, and spacious working space. It adopts double-row columns to support. At the same time, the shield type support has good shielding performance and stable anti-horizontal cavity structure. Strengths. In addition, a solid shield beam and side shields are used to completely separate the working space from the goaf; and the front and rear links are used to connect the shield beam and the base to form a four-link mechanism, which makes the end distance of the beam almost unchanged, preventing Missing in front of the rack.

支撑掩护式液压支架类型

a. Four-post parallel support on top beam
b. Four-post cross-braced bracket on top beam
c. Two pillars supported on the top beam and two pillars supported on the shield beam

Product rendering of hydraulic support

液压支架产品效果图

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