What are the maintenance points for the suspended high and low temperature impact test chamber?

The maintenance and upkeep of the suspended high and low temperature impact test chamber should revolve around its core structure, with the core goal of preventing failures, extending equipment life, and ensuring testing accuracy. It needs to be classified into "daily maintenance, regular maintenance, and long-term shutdown maintenance", and the specific points are as follows:

1、 Daily maintenance

Daily maintenance is the foundation, with a focus on timely detection of surface problems, avoiding the expansion of small hidden dangers, and simple and high-frequency operation.

Appearance and basic cleaning

After each test, wipe the outer surface of the equipment with a dry soft cloth to remove dust, oil stains, or sample residues, and avoid corrosive substances from adhering and causing oxidation of the casing.

Cleaning the interior of the equipment: If there are volatile substances or residues in the test sample, use a neutral cleaning agent (such as diluted alcohol) to wipe it off, and then dry it with a dry cloth to prevent residual substances from corroding the inner chamber or blocking the airflow holes.

Check the surrounding environment of the equipment: Ensure that at least 30cm of heat dissipation space is reserved on both sides and the back of the equipment, without any debris accumulation, to avoid affecting the heat dissipation of the condenser.

Operational status verification

After each use, observe whether the equipment has any abnormal phenomena such as abnormal noise, leakage, and odor. If any problems are found, immediately stop the machine for inspection.

Confirm that the control panel displays normally: there are no garbled parameters such as temperature, time, and cycle times, and the indicator light status is consistent with the actual situation to avoid hidden faults in the electrical system.

Sample and basket inspection

After each test, check whether the basket is deformed or loose: if the sample is overweight or placed improperly, it may cause the basket frame to bend, and it needs to be corrected in a timely manner.

Clean the guide wheels/rails at the bottom of the basket: remove dust or foreign objects, ensure smooth lifting and lowering of the basket, and avoid motor overload caused by jamming.

2、 Regular maintenance

Regular maintenance is required for core functional components, which should be thoroughly inspected on a periodic basis to prevent aging or failure of critical components.

1. Maintenance of refrigeration system

The refrigeration system is the key to cooling equipment, and improper maintenance can directly lead to failure to meet standards in low-temperature areas.

Weekly inspection:

Observe the operating status of the refrigeration compressor: touch the compressor casing and listen for the running sound.

Check the refrigerant pipeline for frost and ice.

Quarterly maintenance:

Clean the condenser: Use compressed air (pressure ≤ 0.4MPa) to blow off the dust on the surface of the condenser from bottom to top; If the dust is thick, it can be wiped with neutral cleaning agent and then rinsed with clean water.

Check refrigerant pressure: Use a pressure gauge to measure the pressure in the high and low pressure pipelines. If the pressure is insufficient, check for leaks and add refrigerant (operated by professionals to avoid mixing refrigerants).

2. Maintenance of heating system

The heating system affects the temperature control accuracy in high-temperature areas, and it is necessary to focus on checking the "heating effectiveness" and "safety".

Check the appearance of the heater: Open the high temperature zone door and inspect the heating tube for deformation, bulging, and carbon deposition.

Calibrate temperature sensor: Use a standard thermometer (accuracy ≥ 0.1 ℃) to compare the temperature displayed on the device every month. If the deviation exceeds ± 1 ℃, it needs to be adjusted through the "calibration function" on the control panel.

Check the wiring of the heating circuit: Open the electrical box door, tighten the heater wiring terminals, and observe whether there are burn marks on the terminals.

3. Mechanical structure maintenance

The suspended basket lifting system is the core of the "dynamic operation" of the equipment, and faults can directly cause testing interruptions.

Check the lifting motor and transmission components:

Listen to the sound of the motor running: There is no "jamming sound" or "friction sound" during the lifting process. If there is any abnormal noise, check whether the guide rail is short of oil and whether the chain/belt is loose.

Test limit switch: manually trigger the "upper limit" and "lower limit" limit switches to confirm that the equipment can immediately stop lifting. If the switch does not respond, clean the contacts or replace the switch.

Check the insulation gate: If the sealing gasket of the gate between high and low temperature zones ages or cracks, it will cause gas leakage at high and low temperatures, affecting the temperature control accuracy. Check if the sealing gasket is intact every month, and replace it promptly if it is damaged; At the same time, clean the dust on the surface of the gate to ensure that the gate is tightly closed.

4. Electrical system maintenance

The electrical system is the "brain" of equipment, and improper maintenance can easily lead to safety accidents.

Monthly inspection:

Tighten electrical wiring terminals: Open the electrical box and gently tighten the terminals for power, motor, and sensor wiring with a screwdriver to avoid equipment shutdown caused by virtual connections.

Check the cooling fan: If the cooling fan inside the electrical box is blocked or stopped, it will cause the controller to overheat and crash. Clean the dust on the fan blades every month, test whether the fan rotates normally, and replace it in a timely manner when there is a malfunction.

Quarterly inspection:

Leakage detection: Use a multimeter to measure the resistance between the equipment casing and the power ground wire (should be ≤ 4 Ω), or use a leakage detector to test to avoid the risk of leakage.

Emergency device testing: Trigger the "emergency stop button" and "overload protection switch" to confirm that the equipment can immediately shut down and ensure safety in emergency situations.

5. Sealing and Airflow Maintenance

The sealing and airflow circulation of the equipment directly affect the temperature uniformity and impact efficiency, and require special maintenance.

Door seal inspection: If the door seals of the main door and high and low temperature area doors of the equipment age or deform, it will cause temperature leakage. Press the door seal with your hand every month to confirm that there are no gaps; If there is hardening or damage, replace it promptly to avoid cold/heat loss.

Cleaning of Airflow Holes: If the airflow circulation holes in the high and low temperature zones are blocked by residual samples, it will cause uneven temperature distribution. Clean the airflow holes with a soft bristled brush every month to ensure smooth ventilation and not obstruct the temperature sensor.

Water tank maintenance: Replace the purified water in the water tank every month, clean the inner wall of the water tank, and check whether the water level sensor is sensitive.

3、 Long term shutdown maintenance

If the equipment is idle for a long time, targeted protection of core components is required to avoid aging or corrosion.

Internal drying and cleaning: Before shutting down, run the equipment with no load to room temperature (around 25 ℃), open all box doors, and allow the internal moisture to evaporate; Wipe the inner liner and basket with a dry cloth to prevent residual moisture from causing rusting of the inner liner.

Refrigeration system protection: If the ambient temperature is below 0 ℃, the cooling water in the refrigeration system (if it is a water-cooled model) needs to be drained to avoid water pipe freezing and cracking; If it is an air-cooled model, cover the condenser with a dust cover to prevent dust accumulation.

Electrical and mechanical protection: Disconnect the main power supply of the equipment and unplug the plug; Apply rust proof oil on mechanical components such as the basket guide rail and lifting motor shaft to prevent oxidation; Seal the electrical box to prevent insects or dust from entering.

Regular power on maintenance: During long-term shutdowns, it is recommended to power on once every 2 weeks (run without load for 30 minutes) to preheat the motor, controller, and other components to avoid capacitor aging or circuit moisture.

4、 Maintenance precautions

Record ledger: Establish a maintenance record form to record the date, content, abnormal situation, and handling results of each maintenance, in order to trace the cause of the fault

Professional operation: Complex operations such as adding refrigerant to the refrigeration system, calibrating temperature sensors, and replacing electrical components must be carried out by equipment manufacturers or qualified professionals to avoid unauthorized disassembly and expansion of faults.

Consumables reserve: Reserve vulnerable parts in advance to avoid prolonged downtime due to stock shortages during malfunctions.

Follow the instruction manual: The structure of different brands of equipment may vary, and maintenance should be based on the equipment manual. Do not mix non compatible consumables.

Through the above maintenance points, equipment failures can be effectively reduced, equipment service life can be extended, and the accuracy of test data can be ensured to avoid invalid test results caused by equipment problems.