Instruction Manual for the Shield-Protecting Jack of Hydraulic Supports Used in Coal Mines

　　First, let’s take a look at… Hydraulic support hoses for coal mines The support-leg jack function.

　　The shield‑support hose guard jack for coal‑mine hydraulic supports is a double‑acting hydraulic cylinder whose function is to swing the protective plate downward, thereby accommodating changes in geological conditions. In other words, it provides both normal folding performance and anti‑offset‑shield functionality.

　　Composition and structure of the hydraulic support hose‑protecting shoring jack for coal mines:

　　The hydraulic support jack is primarily composed of a piston rod assembly, a cylinder assembly, a guide sleeve assembly, seals, and other components.

　　The piston rod assembly comprises a piston rod, piston, seals, guide rings, piston guide rings, and a fixed connector; the piston rod surface is chrome-plated. It offers excellent resistance to corrosion, friction, and impact. The cylinder assembly consists of a cylinder base and a welded cylinder body.

　　Guide Sleeve Assembly: The guide sleeve is connected to the cylinder port via internal threads, retaining rings, cap nuts, and other methods.

　　Seals include V‑rings, bellows seals, D‑rings, JF dust seals, O‑rings, and others.

　　 Hydraulic support hoses for coal mines Working principle of the support jack:

　　When in use, operate the jack’s control valve to allow high-pressure fluid to flow through the hydraulic support, directing the valve assembly, hoses, and connector base into the lower chamber (piston chamber) and thereby extending the piston rod. When the jack is retracting, operate the jack’s control valve to permit high-pressure fluid to pass through the hydraulic support, guiding the valve assembly, hoses, and connector seat into the upper chamber of the jack (piston‑rod chamber), thus causing the piston rod to retract under the action of the working fluid.

　　What are the consequences of improper use or operation of hydraulic support hose‑protecting jacks in coal mines?

　　1) The specifications must conform to the support requirements, and the performance parameters must meet the factory test criteria before the lathe can be used. Hydraulic support hoses and shield‑support jacks for coal mines must pass a re‑inspection before they can be put into service.

　　2) Before use, carefully inspect all components for any defects—such as impact damage—that might affect operation. Under no circumstances should you use hammers or other metal tools to strike any part of the hydraulic support jack during installation or maintenance. In particular, take care to prevent chipping or damaging the piston rod’s gold plating.

　　3) The hydraulic support socket shall not be adjusted, disassembled, or repaired underground; in the event of a malfunction, only qualified components of the same grade may be replaced.

　　4) Select an emulsified oil of the appropriate grade based on the water quality, prepare the emulsion according to a 5:95 oil-to-water ratio, and regularly monitor its performance during use.

　　Finally, Hydraulic support hoses for coal mines The following precautions should be observed when transporting, installing, or using the support jack:

　　1) The socket shall be shipped with a mounting bracket or packaging; the product must be securely fastened to prevent detachment, crushing, or damage.

　　2) During transportation, in winter the product must be filled with antifreeze according to the lowest ambient temperature at the destination and the transport distance; during other seasons, the emulsion should be drained, but ensure that drainage is complete before shipping. During storage, internal corrosion must be prevented.

　　3. If the jack has been stored for more than three months, inspect the emulsion to determine whether it has deteriorated. If deterioration is detected, replace it; when using the draining method, also check for rust and corrosion.

　　4) During use, ensure that the connector housing remains undamaged, and that the transport packaging is sturdy and reliable. When handling during transportation, remove the components gently, paying particular attention to the connector housing to prevent damage that could compromise the functionality of the mating interface.