How to troubleshoot the microscope mechanism?
1. Troubleshooting of coarse adjustment parts of the microscope
The main fault of the coarse adjustment of the microscope is the uneven tightness when it automatically slides down or rises. The so-called automatic sliding down refers to the phenomenon that when the lens barrel, mirror arm or stage is stationary at a certain position, it automatically and slowly falls down under the action of the weight of the microscope itself without adjustment. The reason is that the gravity of the lens barrel, lens arm, and stage itself is greater than the static friction. The solution is to increase the static friction force so that it is greater than the gravity of the lens barrel or arm itself.
For the coarse adjustment mechanism of the microscope tilt tube and most binocular microscopes, when the mirror arm automatically slides down, you can hold the stop pulley on the inside of the coarse adjustment handwheel with both hands, and tighten it clockwise with both hands to stop it. decline. If it doesn't work, you should find a professional to repair it.
The microscope barrel automatically slides down, which often gives people the illusion that the gear and rack fit too loosely. So I added a spacer under the rack. In this way, although the slide of the microscope tube can be temporarily stopped, the gear and rack are in an abnormal engagement state. As a result of the movement, both the gear and rack are deformed. Especially if the pads are uneven, the deformation of the rack will be more severe. As a result, part of the rack will be bitten tightly and part of it will be bitten loose. Therefore, this method should not be used.
In addition, due to the long-term disrepair of the microscope's coarse adjustment mechanism, the lubricating oil has dried up, causing an uncomfortable feeling when lifting and lowering, and you can even hear the friction of the parts. At this time, the mechanical device can be disassembled, cleaned, greased and reassembled.
2. Troubleshooting of microscope fine-tuning part
The most common failures in the fine-tuning part of the microscope are jamming and failure. The fine-tuning part is installed inside the instrument. Its mechanical parts are small and compact, and it is the most delicate and complex part of the microscope. Malfunctions in the fine-tuning part of the microscope should be repaired by professional technicians. If you don't have enough confidence, don't dismantle it casually.
3. Microscope nosepiece troubleshooting
The main failure of the microscope nosepiece is the failure of the positioning device. It is usually caused by damage to the positioning spring (deformation, breakage, loss of elasticity, loosening of the fixing screws of the spring, etc.). When replacing a new spring, do not tighten the fixing screws for the time being, but polish them first according to "3 (2) 2" in this section. Axis correction. After the shaft is closed, tighten the screws. If it is an internal positioning converter, you should unscrew the big head screw in the center of the rotating plate and remove the rotating plate before replacing the positioning bomb. The optical axis correction method is the same as before.
4. Troubleshooting of the lifting mechanism of the microscope condenser (the main fault of this part is also the automatic downward movement)
(1) The lifting mechanism of the straight microscope condenser is: 1.. Celluloid washer 2. Big head screw 3. Eccentric gear rod sleeve 4. Gear rod 6. Lifting handwheel 7. When adjusting the double-eye nut, use both eyes with one hand Insert the nut wrench into the double-eye nut on the end face of the handwheel, use a screwdriver with your other hand to insert into the slot of the big-head screw at the other end, and tighten it firmly to stop it from sliding down.
(2) Lifting mechanism of the oblique tube microscope condenser:
When adjusting, first use a screwdriver to withdraw the standing screw in the middle of the double-eye nut by 1 to 2 turns. The bearing washer is a tight fit with the standing screw, so it will also withdraw with it and separate from the end face of the gear rod. Then, use a double-eye nut wrench to screw the double-eye nut into the adjusting seat. At the same time, use the other hand to turn the handwheel and conduct a test until the lifting mechanism is properly tightened and can stay in any position, then stop the screwing of the double-eye nut. Finally, screw the screw in again so that the bearing washer contacts the gear rod.
The reason why this adjustment can eliminate the fault is because the inner hole of the adjustment seat is tapered. The tapered bushing is notched in the axial direction. When the double-eye nut 1 is screwed inward, the conical sleeve is pushed inward, so that when the conical sleeve advances, the notch becomes smaller and the inner hole shrinks, clamping the gear rod tighter and increasing the friction of the gear rotation. resistance, thus preventing automatic descent.
