Due to the technical principle and structural characteristics of the piston-type single hydraulic prop, a weak arc welding seam is provided on the column. The quality of the arc welding seam is difficult to guarantee in technology, although it is in the 5.3 of the MT112-93 standard.
Due to the technical principle and structural characteristics of the piston-type single hydraulic prop, a weak arc welding seam is provided on the column. The quality of the arc welding seam is difficult to guarantee in technology, although it is in the 5.3 of the MT112-93 standard. .5 The specific requirements for the tensile strength of the weld σb≥500Mpa and the elongation δs≥10% are specified, but the problem of how to detect it at the production site has not been solved.
As a result, failures of welds are often caused, such as: fractures of column welds, leaks of welds, leaks of welds, etc., resulting in pillar failure or roof accidents. Therefore, the piston hydraulic prop also has serious safety risks. At present, the single hydraulic props at home and abroad are welded to the movable column with the stigma of the three-purpose valve.
When the movable column is raised, the operator must rise with it, especially for higher working surfaces, the operator is very inconvenient and unsafe; and the DWX series pillar three-purpose valve is set on the handle body, when the liquid is injected At this time, the three-purpose valve does not rise with the rise of the movable column, and is easy to operate, safe and reliable. Each seal point adopts seal compensation and seal tightening technology, which can effectively compensate when the seal is worn. The specific requirements for tensile strength σb≥500Mpa and elongation δs≥10% of the weld are specified in the article, but the problem of how to detect it at the production site has not been solved.
As a result, failures of welds are often caused, such as: fractures of column welds, leaks of welds, leaks of welds, etc., resulting in pillar failure or roof accidents. Therefore, the piston hydraulic prop also has serious safety risks. At present, the single hydraulic props at home and abroad are welded to the movable column with the stigma of the three-purpose valve.
When the movable column is raised, the operator must rise with it, especially for higher working surfaces, the operator is very inconvenient and unsafe; and the DWX series pillar three-purpose valve is set on the handle body, when the liquid is injected At this time, the three-purpose valve does not rise with the rise of the movable column, and is easy to operate, safe and reliable. Each seal point adopts seal compensation and seal tightening technology, which can effectively compensate when the seal is worn.
