Hydraulic Support Pipe

Hydraulic Support Pipe Definition

Hydraulic support pipe mainly serve as hydraulic equipment for coal mine exploitation, truck crane, and other hydraulic cylinders. Hydraulic support pipe is widely used on hydraulic system, plastic machinery, injection molding machinery, rubber machinery, forging machinery, engineering machinery, automobile industry, shipbuilding industry, construction, agriculture and forestry machinery, automation machinery, petrochemical industry, hydraulic pneumatic, air conditioning and so on.

Advantages of hydraulic transmission:

Compared with mechanical transmission and electrical transmission, hydraulic transmission has the following advantages
  1. Various components of hydraulic transmission can be arranged conveniently and flexibly according to the needs.
  2. It has the advantage of light weight, small volume, small inertia and fast reaction speed.
  3. It is easy to operate and control, and can realized a wide range of step-less speed regulation.
  4. Overload protection can be realized automatically.
  5. Mineral oil is generally used as the working medium, and the relative moving surface can be self lubricated and has a long service life.
  6. It is easy to achieve linear motion.
  7. It is easy to realize the automation of the machine, when the electro hydraulic joint control is adopted, it an not only realized a higher degree of automatic control process, but also realize remote control.

Hydraulic cylinder pipe Images


Mechanical properties: 

Grade   Tensile strength (MPa) Yield strength (MPa) Elongation (%) Impact energy( J) Hardness( HBS)
  No Less Than  
20 400 245 20 - -
35 510 305 17 - -
45 600 355 16 39 ≤197
27SiMn 980 835 12 39 ≤217

Chemical composition:

Grade   C Si Mn P S Ni Cr Cu Mo
No More Than
20 0.14-0.23 0.17-0.37 0.35-0.65 0.030 0.030 0.25 0.25 0.20 -
35 0.32-0.39 0.17-0.37 0.50-0.80 0.035 0.035 0.25 0.25 0.20 -
45 0.42-0.50 0.17-0.37 0.50-0.80 0.035 0.035 0.25 0.25 0.20 -
27SiMn 0.24-0.32 1.10-1.40 1.10-1.40 0.035 0.035 0.25 0.25 0.20 0.15


1What is the difference between suspended single hydraulic prop and ordinary single hydraulic prop?
Suspended single hydraulic prop adopts plunger suspension technology principle, which makes the hydraulic suspension force directly act on the top cover through the inner cavity of the pillar movable column, so that the hydraulic suspension force shares about four fifths of the working resistance of the pillar, and the axial force of the movable column is only one fifth of the working resistance, which improves the stability and safety of the pillar and greatly improves the supporting height and bearing capacity of the pillar. To put it simply, the suspension single hydraulic prop not only increases the working stroke, but also increases the bearing capacity!
2What problems should be paid attention to when single hydraulic prop is prop-pulling?
A, single hydraulic prop before prop-pulling, check the surrounding roof, support are in good condition, such as broken beam, lack of column and other unsafe factors, must deal with rear can prop-pulling.
B, single hydraulic prop-pulling to cooperate with two people, one prop-pulling, one roof observation. When prop-pulling, it is necessary to work in a safe place with intact supports, clean up the retreat, lay a good protective pillar, and inform other staff working around.
C, when the roof weighting and encounter other danger, to stop prop-pulling, retreat after being processed. When promised to prop-pulling in sections, the working spacing in sections shall not be less than specified.
D, large area hanging roof and roof pressure is too large, not artificial prop-pulling, application of winch prop-pulling far apart, or retreat in other safe ways.
E, monomer hydraulic prop unloading, must use unloading hand or special tools far interval unloading, unloading, must be gradually unloaded from small to large, after being roof stability, pillar from the top beam, can quickly unload.
F, single hydraulic prop are not allowed to use winch retracement, such as a dead column, can be used to pick the top method back out, and it is strictly prohibited to shooting back out.
3Classification of single hydraulic prop?
Single hydraulic prop is a new environment-friendly supporting equipment, which can be matched with metal hinged roof beam to support roof and support end of fully mechanized mining face in high-grade general mining and blasting, and can also be used as spot pillar or other temporary support.
A, according to the different liquid supply methods and working fluids, it is divided into external liquid supply type (hereinafter referred to as external injection type) and internal liquid supply type (hereinafter referred to as internal injection type) pillars.
B, according to the different working trips, it can be divided into single telescopic (single trip) pillar and double telescopic (double trip) pillar. If the trip characteristics are not indicated, it is a single telescopic pillar.
C, according to the different materials used, it is divided into ordinary steel pillars, high titanium alloy pillars, aluminum alloy pillars, stainless steel pillars, etc. If the material characteristics are not indicated, it is a steel pillar.
D, according to the structure form can be divided into piston pillar and plunger suspension pillar two categories. Piston strut is divided into single telescopic strut and double telescopic strut according to working stroke. The plunger suspension strut adopts water medium, which belongs to "environmental protection" strut.