The temperature shock test chamber, as a core equipment for simulating extreme temperature environments, is widely used in product reliability testing in fields such as electronics, automotive, aerospace, etc. Its long-term stable operation relies on a scientific and standardized maintenance system. This article elaborates on the maintenance plan in detail from three aspects: daily maintenance, regular inspection, and emergency response to faults.

1、 Daily maintenance: the foundation of preventive maintenance

1. Cleaning and dust prevention management

Cleaning of the test area: After each test, use a soft cloth or vacuum cleaner to remove any residue from the test sample, avoiding impurities from adhering to the surface of the refrigeration pipeline or heating element. For example, in the thermal fatigue testing of metal materials, the detachment of oxide scale may block the air duct, leading to a decrease in temperature uniformity.

Condenser dust removal: Use compressed air to blow the condenser fins every month to prevent dust accumulation from affecting heat dissipation efficiency. A certain enterprise caused continuous alarms and shutdowns of equipment due to failure to clean the condenser in a timely manner. After maintenance, it was found that the refrigeration efficiency had decreased30%.

2. Refrigeration system monitoring

Pressure gauge inspection: Record high and low pressure values daily, and the normal range should be high pressure1.2-1.5MPaLow voltage0.3-0.5MPaIf the pressure is abnormal, it is necessary to investigate refrigerant leakage or expansion valve failure.

Oil level observation: Confirm the amount of lubricating oil through the compressor sight glass, and the oil level is below1/3It is necessary to supplement with specialized refrigeration oil to avoid further mechanical wear and tear.

3. Electrical system inspection

Wiring Tightening: Check the power cord and sensor connection wire for looseness every quarter to prevent poor contact from causing data fluctuations or equipment shutdown.

Grounding test: Use a grounding resistance tester to verify the grounding resistance of the equipment≤1ΩEnsure operational safety.

2、 Regular maintenance: the core of systematic maintenance

1. Semi annual in-depth maintenance

Refrigerant purity testing: Entrust a professional organization to analyze the refrigerant (such asR404A）If the acid value and moisture content exceed the standard, the refrigerant should be replaced and the drying filter should be cleaned.

Heating element resistance measurement: Use a multimeter to check the resistance value of the heating tube, and the deviation exceeds±10%Replacement is necessary to avoid safety hazards caused by local overheating.

2. Annual comprehensive calibration

Temperature uniformity verification: evenly distributed in the testing area9A calibration point, using a standard thermometer to record the deviation between the actual value and the displayed value, exceeding the tolerance±2℃Adjust the position or calibrate the temperature sensor when necessaryPIDParameters.

Temperature change rate test: monitored by a data logger from-55℃Rise to+125℃If the conversion time exceeds15Valve or fan systems require immediate maintenance.

3、 Fault Emergency: Rapid Response and Handling Mechanism

1. Common troubleshooting

alarm codeE01(Overtemperature): Check if the fan stops running, if the heating tube is short circuited, and confirm if the temperature sensor connection wire is broken.

alarm codeE03(Refrigeration failure): Use a pressure gauge to determine if there is a shortage of refrigerant. If the pressure is normal, check the resistance of the compressor coil.

2. Spare parts management strategy

Key component reserves: Keep spare compressor contactors, temperature sensors, heating tubes, and other vulnerable parts to ensure safety in case of failure4Complete the replacement within hours.

Supplier collaboration: Sign annual maintenance contracts with equipment manufacturers to obtain original factory technical support and rapid response services.

4、 Maintain records and optimize

Establish an electronic maintenance file to record the maintenance time, component replacement, and testing data for each maintenance. Through data analysis, it was found that strictly implementing maintenance plans can reduce equipment failure rates65%Extend the service life to10Years or more. For example, a certain automotive electronics company optimized the cleaning cycle and increased the frequency of refrigeration system maintenance from annual to annual3Reduced to1Next, save maintenance costs annually12Ten thousand yuan.

A scientifically standardized maintenance plan is the core to ensure the stable performance of the temperature shock test chamber. Enterprises need to develop differentiated maintenance plans based on equipment operating intensity, and regularly train operators to master basic fault handling skills, in order to maximize equipment investment return.