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DN08 Coal Mining Hydraulic Prop

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DN type internal injection single hydraulic prop is a constant resistance prop, which is suitable for roof support of general mechanized coal mining face in coal mines in combination with metal hinged roof beam, and can also be used for comprehensive mechanized coal mining face end support or temporary support. support.
  • Underground Explosion-proof

  • Safety And Environmental Protection

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Product Description

ND3W29NA3GZWAEEE

DN type internal injection single hydraulic prop is a constant resistance prop, which is suitable for roof support of general mechanized coal mining face in coal mines in combination with metal hinged roof beam, and can also be used for comprehensive mechanized coal mining face end support or temporary support. support.

DN internal injection type single hydraulic prop is suitable for roof support and end roof support of coal mining working face. Thin coal seam, medium thick coal seam and thick coal seam working face.

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液压支柱5

Compared with mechanical transmission and electrical transmission, hydraulic transmission has the following advantages:

1. Various components of hydraulic transmission can be conveniently and flexibly arranged according to needs.

2. Light weight, small volume, small motion inertia and fast reaction speed.

3. Convenient operation and control, which can realize a wide range of stepless speed regulation

4. Overload protection can be realized automatically.

5. Generally, mineral oil is used as the working medium, and the relative moving surface can be self lubricated with long service life;

6. It is easy to realize linear movement

7. It is easy to realize the automation of the machine. When the electro-hydraulic joint control is adopted, not only a higher degree of automatic control process can be realized, but also remote control can be realized.

The single hydraulic prop is referred to as a single column for short, which is different from the hydraulic support in structure. 

It is matched with a metal hinged roof beam for the support of ordinary mechanized coal mining face; it can also be used for partial areas of fully mechanized mining face, such as end or temporary support.

The single column has no pushing device, integral base and top beam, but the structure of the column itself is more complicated than that of the column on the hydraulic support. 

The single column is also a constant-resistance working column.

The single hydraulic prop is composed of cylinder block, movable column, valve and other parts.

Among them, the three-purpose valve is the heart of the external injection type single hydraulic prop, which consists of a one-way valve, an unloading valve and a safety valve king.

液压支柱4

液压支柱6

The one-way valve is used for liquid supply of the single hydraulic prop, the unloading valve is used for unloading the single hydraulic prop and returned to the column, and the safety valve ensures that the single hydraulic prop has constant resistance characteristics. 

Now, the structure and working principle of the external injection unit hydraulic pressure are introduced as an example.

With the extension of the support time, the load of the working face roof on the pillar increases. 

When the pressure of the roof exceeds the rated working resistance of the pillar, the high-pressure liquid in the inner cavity of the pillar opens the safety valve in the three-purpose valve, and the liquid flows from the right valve pipe. 

The gap between it and the safety valve sleeve overflows, the pressure in the inner cavity of the strut decreases, and the strut shrinks down. 

When the pressure in the inner cavity of the strut is lower than the spring force of the safety valve, the safety valve is closed, the pressure liquid in the inner cavity of the strut stops overflowing, and the strut no longer shrinks.

Product Parameters

ND3W29NA3GZWAEEE

Model

DN06

DN08

DN10

DN12

DN14

DN16

DN18

DN20

DN22

Max Height mm

650

800

1000

1200

1400

1600

1800

2000

2240

Min Height mm

510

590

700

850

1000

1100

1200

1390

1540

Working Limit mm

140±10

210±10

300±10

350±20

400±20

500±20

600±20

610

700

Rated Working Resistance kN

250







300


Rated Working Pressure MPa

49







46.3


Cylinder Inner Dia mm

80







90


Initial Support kN

49




68.7-78.5





Base Area cm2

120









Max. Torque On Handle N.m

<200









Increase Height per Handle Shake mm

≥12




≥20





Down Prop Seed mm/s

>20




>30





Working Medium

5# hydraulic oil










5#Hydraulic oil









Weight kg

23

26

29

34

38

41

45

55

60


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Phone:+86-18660761303
Email:info@chinacoalintl.com
Address:No.11, North of Kaiyuan Road, High-tech Zone, Jining City, Shandong Province, China