In order to study the cold resistance of rice and improve the cold resistance ability of rice, it is necessary to research the rice breeding. Therefore, artificial climate chamber is used to treat rice and the temperature is controlled at 15OC. After two months of continuous operation, an automatic alarm shutdown failure occurred on a certain day. Open the door; a surge of heat blowing, apparently the temperature inside the box went out of control rose to 50 october and protect the shutdown. Check the temperature sensor, the temperature amplifier is no problem, the refrigerator is also normal. Wait until the temperature in the box drops to room temperature before turning on the watch: The machine can start normally.
Artificial climate box heating, refrigeration indicator light can also exchange display. But when the refrigeration indicator light, the machine during the cooling process, the temperature inside the box is still sharp and I vibration vibration machine structure and work of the original fishery can refer to the drawings of the instructions) we can see: the aircraft's temperature rise and fall if the use of temperature amplifier output Control heating, cooling two electromagnetic cutting off. When the temperature exceeds the control temperature, the cooling electromagnetic cutting is turned on, the heating electromagnetic cutting is turned off without electricity, the cooling indicator light is on, and the machine performs the conventional cooling process. When the temperature is low, the non-burning electromagnetic cutting is turned on. The cold electromagnetic cutting is turned off without electricity and the heating indicator light is on. At this time, the high-heat gas pressed by the refrigerator is directly heated into the evaporator by heating the electromagnetic cutting to heat up. After the machine is started, the two electromagnetic cuttings are so frequently and alternately opened and closed for the purpose of temperature control.
The fault phenomenon is that the cooling indicator light is on, and the temperature is also increased when the refrigeration cutting process is turned on. Temperature sensors, amplifiers and chillers are no problem. According to the above analysis, it may be estimated that the failure of heating and electromagnetic cutting is in a normally open state. In this way, although the indicator light indicates that the crucible is a pity process, in fact, the cooling and heating are cut at the same time, and the high-heat gas directly enters the evaporator to offset or even exceed the cooling effect, and the temperature can only rise and cannot be lowered, which inevitably leads to an automatic alarm shutdown exceeding the upper limit of 50 oc. . When the trial machine observes, it is very hot to cut the evaporator section by hand to heat the evaporator section, and the sound of ear-heating and cutting is not very clear.
After the artificial climate box is shut down, it is checked that the heating coil is intact. The springs on the cutting armature have been broken into three sections. It should be a long time when the servo is turned on continuously, the electromagnetic cutting action is frequent, and the spring is fatigued. Electromagnetic cutting is closed by spring pressure when there is no electricity, and once there is no spring power, the high-heat gas will be heated and cut open to produce the above-mentioned failure. After the replacement of the spring, the battery was switched on again. The two cuts were flexible, the sound was crisp, and the cooling and heating exchange was clear. The normal operation was resumed one by one to ensure the successful completion of the test.
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