How to solve common column lift failure problems

In modern industrial environments, the stability and reliability of electrical control systems, hydraulic systems, mechanical structures, and safety protection systems are critical to the normal operation of equipment. For the fault diagnosis and maintenance of these systems, it is particularly important to establish a systematic hierarchical diagnosis mechanism.

For electrical control systems, core faults such as motor failure or abnormal vibration must be analyzed in depth. When the device has the situation of "no response to the start button", the power input of the control circuit board must be checked first. Using a multimeter to detect the stability of the 24V DC power supply is the first step. If the voltage is normal, the state of the relay contacts should be checked for oxidation or adhesion. Taking the GE OEC-8800 mobile C-arm X-ray machine as an example, in its column lifting failure, once the contact resistance of relay K15/K16 exceeds 0.5Ω, it will cause signal transmission interruption. Therefore, timely maintenance and inspection are essential. For abnormal noise emitted by the motor, it is recommended to use a spectrum analyzer to detect the vibration frequency. If a 100Hz frequency multiplication component is found, it can be determined that the rotor is unbalanced, and it is necessary to correct it through a dynamic balancing machine to achieve the accuracy standard of G2.5.

In terms of hydraulic systems, fault handling requires the construction of a "oil-valve group-seal" trinity maintenance system. When the column lift has the phenomenon of "slow lifting", the first task is to detect the viscosity and cleanliness of the hydraulic oil. According to ISO 4406 standard, the NAS grade of hydraulic oil should be ≤9. If the oil is found to be milky white, it is necessary to immediately replace it with anti-wear hydraulic oil that meets the ISO VG32 standard, and clean the return oil filter at the same time. For the problem of automatic fallback caused by hydraulic lock failure, the use of pressure tester is indispensable. The standard pressure holding capacity should be ≥15MPa. If the leakage exceeds 0.5ml/min, the Y-type sealing ring needs to be replaced and the safety valve pressure needs to be recalibrated. In the maintenance case of a CT device in a hospital, by replacing the DN15 solenoid valve and optimizing the direction of the hydraulic pipeline, the lifting response time was successfully shortened to 1.2 seconds, significantly improving the working efficiency of the equipment.

The repair of mechanical structure failures also requires the combination of precision measurement and material science. When the two-column lift is "unbalanced from left to right", the application of the laser tracker can effectively detect the verticality of the column, and the tolerance range must be controlled within ±0.5mm/m. For the wear problem of the wire rope, the number of broken wires is detected by magnetic particle flaw detection technology. If more than 3 single-strand broken wires are present, the 8×19S+FC wire rope that complies with the EN 12385 standard must be replaced immediately. In the case of a certain automobile repair shop, by adding chemical anchor bolts to the base of the column, the anti-overturning capacity of the equipment is increased to 2.5 times the rated load, which effectively solves the shaking problem caused by ground subsidence.

The maintenance of the safety protection system requires the establishment of a digital early warning mechanism. For the failure of the anti-pinch protection of the lifting column, the infrared thermal imager can effectively detect the shooting angle of the photoelectric switch, and its standard deviation must be ≤0.5°. In addition, regularly measuring the resistance of the solenoid valve coil to ensure that it is within the normal range of 200±10Ω is an important measure to ensure system safety. In the case of a logistics center, vibration sensors and edge computing modules were deployed to achieve real-time monitoring of hydraulic pumps and successfully avoid three potential accidents.

Finally, preventive maintenance should build a closed-loop system of "condition monitoring-fault prediction-intelligent decision-making". It is recommended to use oil analysis technology to detect the metal particle content in hydraulic oil. If the iron content exceeds 50ppm, the hydraulic oil must be replaced immediately and the wear of the pump body must be checked. For the insulation performance of the motor, it is recommended to use a megohmmeter to test it every quarter to ensure that it is within the safe range.