The second letter Y stands for shield type, Z stands for support type, and F stands for top coal caving;

For example, ZY 12000/26/56, Z-shaped bracket, Y-shaped shielding type, 12000- refers to the working resistance 12000KN, 26- refers to the minimum height of bracket 26dm (decimeter), and 56- refers to the maximum height of bracket 56dm (decimeter).

Hydraulic support consists of hydraulic cylinder (column, jack) and load-bearing components (top beam, shield beam, base, etc.). ), push device, control system and other auxiliary devices.

Extended data:

The support is provided by emulsion pump station installed in roadway or cave. When the pressure emulsion enters the column through the control system, the bracket lifts the initial supporting top plate. With the roof sinking, the support resistance of the bracket to the roof increases, and the pressure of the locking liquid in the column is limited by the safety valve to realize constant resistance support.

Support type generally indicates the type of support (two pillars, four pillars, top coal caving, etc.). ), and then explain the working resistance and the minimum and maximum support height, such as ZF 12000/25/40, Z- support, F- caving, 12000- refers to the working resistance 12000KN.

The working resistance provided by the support to the roof in the unit roof control area. This value varies with the height of the support except the support. It is one of the basic parameters of the support determined according to the roof condition, which is mostly 0.4 ~ 0.8 MPa in China.

The maximum and minimum height that the support can expand and contract, the former refers to the height of the support when the column is fully expanded and contracted, and the latter refers to the height of the support when the top beam is in a horizontal state when the column is fully contracted. The ratio is called stent expansion ratio. This difference is called the contraction of the support. The determination of support height mainly considers mining height and its change, as well as factors such as roof characteristics, coal mining method, support transportation and safety.

The actual use height of the bracket should be less than the maximum height and greater than the minimum height. At the beginning of 1990s, the maximum height of hydraulic support has reached 6m, and the minimum height is 0.5m The greater the expansion range of support, the stronger the ability to adapt to the change of coal seam, but it also increases the complexity and weight of support.

References:

Baidu encyclopedia-hydraumatic support

References:

Baidu Encyclopedia-Product Model Compilation and Management Method of Hydraulic Support