Troubleshooting of Artificial Climate Box Refrigeration System
Step one: First use nitrogen pressure leak detection system to determine whether the leak occurred in the high pressure parts. After a series of inspections, the final leak location was determined between the press exhaust pipe and the right condenser connection pipe. At this point, the connecting pipe is cut off first, and then the connecting pipe of the condenser is welded. After the welding is completed, it is possible to start vacuuming and adding ice. After the addition, the power of the artificial climate box is turned on and the switch is opened to observe whether it is cooled. After cooling for four hours, the freezer temperature reached -13°C, and the freezer temperature reached 8°C. After about ten hours of continuous cooling, the temperature was reduced to 3°C when refrigerated, and the freezer temperature began to rise. Ascending, while the capillary of the cold room continues to work without conversion.
Step 2: Assume that the cause of the fault is ice blocking in the freezer chamber capillary, causing the refrigeration system to malfunction. You can use nitrogen to flush the evaporators of the freezer and refrigerator, and replace the new one with the same specifications. After the replacement, inject 15ml of methanol into the system, and then vacuum. After three hours, add ice and re-test. If it still cannot be cooled, stop immediately and use the automatic detection function to detect the solenoid valve. At the same time, check the capillary connection status of the freezing chamber to determine whether it is connected correctly.
Step 3: After the refrigerator is closed, run the freezer evaporator separately. If it can work normally and there is no sign of recovery when the temperature drops to -15°C, then the possibility of ice blocking in the evaporator capillary can be excluded.
Step 4: Assume that the fault is caused by the stuck solenoid valve and the failure of the conversion function. Then replace the new solenoid valve, and then vacuum again. After the ice is added, retry the test. If the system still cannot work properly, you can eliminate the stuck solenoid valve. The possibility.
Step 5: Check the four sensors and observe whether their resistance is about 2.5KΩ. If yes, the sensor is normal. However, considering the effect of temperature on the resistance of the sensor, it is necessary to replace the four sensors in order to replace the test machine. If the failure is not eliminated, the possibility of sensor abnormality is eliminated.
Step 6: Study the operation status of the control section and check the working status of the computer board and the operation display board. If there is any program confusion or system failure, replace the operation display board and the computer board to see if the system returns to normal.
Step 7: After overhaul, if the above sections are all normal, check whether the connecting wire in the artificial climate box is abnormal and whether the electromagnetic interference has caused the malfunction. You can open the foam first and observe the connection. If you find that the foam on the side of the refrigerating compartment is dampened by moisture, which results in moisture between the sensor and the connection line, which leads to the aging of the line, you can determine that the aging of the line and the insulation have caused the resistance change. , Affected the normal operation of the computer version, there is a system failure. At this point, replace the new sensor cable, re-foam, and test machine, artificial climate box back to normal, troubleshooting.
Machinery shell with gearbox shell processing
Machinery for typical gearbox shell body parts, main processing plane and hole system, to ensure that the size of the hole in the process of machining precision and position accuracy, handle the relationship between hole and plane. Should follow the principle of surface before hole, namely first processing box on the datum plane, and then to datum plane positioning processing other plane, then processing hole system. Because of the planar area is large, with its positioning can ensure reliable positioning, clamping and firm, and therefore easy to guarantee machining precision holes. Secondly, cut off the casting surface uneven, create conditions to improve the machining precision of holes, facilitate and adjustment of the knife, is conducive to protect the cutting tool. Processing technology should also follow the principle of separate rough finish machining.
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