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Q1: After a system overhaul, the pump’s LR2 control conflicts with the new directional valve—how to resolve the control logic mismatch?
A1: Control conflicts arise from mismatched pressure/flow signals between the LR2 pump and new valve—resolution steps: ① Identify Conflict Type: 1) “Pressure Conflict”: Valve requires 300 bar, but pump limits to 250 bar (LR2 power setting too low); 2) “Flow Conflict”: Valve demands 80 L/min, but pump only supplies 50 L/min (swashplate angle restricted); ② Parameter Calibration: 1) For Pressure Conflict: Increase the LR2 power limit by adjusting the power feedback sensor (e.g., from 37 kW to 41 kW) to allow higher pressure; 2) For Flow Conflict: Adjust the LR2 control valve’s maximum displacement screw (clockwise 1/2 turn) to increase flow output; ③ Signal Synchronization: Connect the directional valve’s load signal (LS port) to the pump’s control port Y—this creates a closed loop where the pump adjusts flow/pressure based on the valve’s demand; ④ Testing & Tuning: Operate the valve through all positions while monitoring pump pressure/flow—use a oscilloscope to verify that pump signals (4-20mA) align with valve signals; adjust the LR2 valve’s damping to eliminate signal lag (≤0.1s); ⑤ Documentation: Record the calibrated parameters (power limit, flow range) and store them in the system manual—critical for future maintenance. This process resolves 95% of control conflicts between LR2 pumps and new hydraulic components.
Q2: The pump’s case drain oil turns black after 300 hours of operation in a coal mine—what is the cause and how to mitigate it?
A2: Black case drain oil indicates severe contamination by coal dust and wear particles—mitigation measures: ① Root Cause Analysis: 1) Coal dust enters the system via damaged suction strainers or breather filters; 2) Abrasive dust causes accelerated wear of piston shoes and swashplate, generating black metal particles; ② Immediate Actions: 1) Drain all contaminated oil and flush the system with 50L of clean oil (circulate for 10 minutes); 2) Replace all filters (suction, return, inline) with high-efficiency versions (25μm); 3) Disassemble the pump to clean piston shoes and swashplate (replace if wear exceeds 0.03mm); ③ Long-Term Mitigation: 1) Install a pressurized tank breather (Rexroth R901423567) that maintains positive pressure in the tank (prevents dust ingestion); 2) Use a magnetic filter in the case drain line to capture metal particles; 3) Shorten oil change intervals to 1 month and filter cleaning to 3 days; 4) Apply a coal dust repellent coating (Rexroth CD 500) to the pump housing to prevent dust accumulation; ④ Monitoring: Use a particle counter (Rexroth PC 200) weekly to measure oil contamination—NAS 9 class is the maximum allowable in coal mines. Failure to mitigate will reduce pump life to 1000-1500 hours (vs. 8000+ hours in clean environments).
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
2015
Total Annual:
2000000-5000000
Employee Number:
30~50
Ecer Certification：
Verified Supplier
Xiamen Lang Ye Hydraulic Electromechanical Equipment Co., Ltd.Lang Ye Hydraulic is the excellent supplier of hydraulic gear pump, HPU, hydraulic control valve, orbital motor and so on. We offer integrated R& D, production and sales service. We have our own self built R&D laboratory and a num... Xiamen Lang Ye Hydraulic Electromechanical Equipment Co., Ltd.Lang Ye Hydraulic is the excellent supplier of hydraulic gear pump, HPU, hydraulic control valve, orbital motor and so on. We offer integrated R& D, production and sales service. We have our own self built R&D laboratory and a num...
