Failure Phenomenon And Cause Analysis Of Ultra-high Pressure Hand Pump
Failure phenomenon and cause analysis of ultra high Pressure manual pump: Find the cause of the failure from the following three points during maintenance and improve the system:Hand Pump
(1) Check the internal leakage of the boom cylinder. The easiest way to do this is to raise the arm to see if there is a noticeable drop in freedom. If the whereabouts of the obvious removal of ultra-high pressure manual pump cylinder inspection, seal ring if worn should be replaced.Hand Pump
(2) Check the control valve. First cleaning safety valve, check whether the valve core wear, such as wear should be replaced. If the safety valve is not changed after installation, then check the control valve spool wear condition, its clearance use limit is generally 0. 06mm, wear seriously should be replaced.
(3) measure the pressure of ultra-high pressure manual pump. If the pressure is low, then the adjustment, add pressure is still not up, then the hydraulic pump serious wear. In general, the main reasons for the inability to lift the arm belt are: a. The hydraulic pump is badly worn. In the low-speed operation of the pump leakage is serious; high-speed operation, ultra-high pressure manual pump slightly improve, but because of the pump wear and leakage, volume efficiency significantly reduced, difficult to achieve the rated pressure. Long-time hydraulic pump work and increased wear, oil temperature rise, resulting in hydraulic components wear and sealing parts of aging, damage, loss of sealing capacity, hydraulic oil deterioration, and finally lead to failure. b． The selection of hydraulic components is unreasonable. Dynamic ARM cylinder specifications for 70/40 non-standard series, seals are not standard parts, high manufacturing costs and inconvenience of sealing parts replacement. The cylinder diameter of the movable arm oil cylinder is small, which will make the system adjust the pressure high. C． The design of hydraulic system of ultra high pressure manual pump is unreasonable. Control valve and full hydraulic steering gear for single Pump series, the relief valve to adjust the pressure of 16MPa, and the hydraulic pump rated working pressure is 16MPa. Hydraulic pump often in full load or long time overload (high pressure), and the system has a hydraulic impact, long-term oil, hydraulic oil pollution, aggravate the hydraulic pump wear, so that the hydraulic pump shell burst (after the failure of this type).Hand Pump