The microscope is the most commonly used instrument in biological experiment teaching. After frequent use, there will be some failures, which will make the microscope unable to use normally. Since the microscope is a precise and valuable instrument, it is impossible to add and update at any time. Therefore, it is very important to troubleshoot in time and keep it in perfect working condition. Here are some common troubleshooting methods for microscopes for your reference.
1. Rough adjustment failure
The fault phenomenon is that when the coarse collimation screw is rotated, the lens barrel cannot be raised and lowered.
The lifting of the microscope barrel is realized by a gear that drives a rack, and the gear is fixed on the shaft of the coarse adjustment knob, and the rack is fixed on the barrel. When the coarse adjustment knob is turned, the gear drives the bar to lift the lens barrel. If the lens barrel cannot be raised and lowered, it means that the gear and the rack do not match. The common cause of failure is that the gear rod sleeve rotates with the coarse adjustment knob, that is, the two stop screws on the gear rod sleeve do not fix the gear rod sleeve on the dovetail guide rail.
Repair method:
Move the gear to the middle of the notch of the gear rod sleeve, and make the notch of the gear rod sleeve face the rack, and then use a small screwdriver to tighten the two stop screws on the end surface of the tail rail. If it is invalid, it means that the rack is seriously worn. You need to remove the lens barrel, unscrew the fixing screws on the upper and lower rack, and use the rack upside down, because the rack wear mainly occurs on the upper part of the rack.
Or cut a piece of metal foil according to the width of the rack, let the metal foil be inlaid on the rack, and fix the foil and the rack on the lens barrel with a fixing screw, and insert the lens barrel for debugging. If you feel tightness, you can change the thickness of the metal sheet until it is suitable. Or buy a new rack from the manufacturer according to the original model specifications.
2. The lens barrel slides down by itself
The fault phenomenon is that when the focus is aligned, the lens barrel will slide down by itself when the focus screw is released by the hand, resulting in the inaccurate focus.
In the coarse adjustment structure of the microscope, the tightness of the gear shaft is generally controlled by the friction between the gear shaft sleeve and the coarse adjustment knob, and the friction between the gear shaft and the gear shaft sleeve is controlled by the two connected to the gear shaft. A coarse adjustment knob is obtained by pressing two plastic washers tightly on the end face of the toothed rod sleeve. The tighter the coarse adjustment or the pressing with the end face of the gear rod sleeve, the greater the friction force obtained. The reason why the lens barrel slides down on its own is due to the wear and tear of the gasket, which reduces the friction between the gear shaft and the gear rod sleeve. The torque generated by the friction between the gear shaft and the gear rod sleeve cannot overcome the gravity of the lens barrel and caused by the generated torque.
The above information is provided by microscope objective supplier.
