How to troubleshoot the faults in the microscope mechanism?
1. Troubleshooting for coarse adjustment of the microscope
The main failure of the coarse adjustment of the microscope is the unevenness of the automatic slide or lift. The so-called automatic sliding refers to the phenomenon that when the lens barrel, lens arm or stage is still at a certain position, it will automatically and slowly fall 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 to be greater than the gravity of the lens barrel or lens arm itself.
For the coarse adjustment mechanism of the inclined tube of the microscope and most binocular microscopes, when the mirror arm automatically slides down, you can hold the anti-slip wheel on the inside of the coarse adjustment handwheel with both hands, and tighten both hands clockwise to stop it. slide. If it doesn't work, you should find a professional to repair it.
The automatic slide of the microscope barrel often gives people the illusion that it is caused by the loose fit between the gear and the rack. So add spacers under the rack. Like this, although the slide of the microscopic lens barrel can be temporarily stopped, the gear and the rack are in an abnormal state of engagement. As a result of the movement, both the gear and the rack are deformed. Especially when the mat is uneven, the deformation of the rack is more serious. As a result, some parts are bitten tightly and some parts are bitten loosely. Therefore, this method should not be adopted.
In addition, due to the long-term disrepair of the microscope's coarse adjustment mechanism, the lubricating oil is dry, and it will produce an uncomfortable feeling when lifting and lowering, and even the friction sound of the parts can be heard. At this time, the mechanical device can be disassembled for cleaning, greased and reassembled.
2. Troubleshooting of microscope fine-tuning
The most common failures of the fine-tuning part of the microscope are sticking and failure. The fine-tuning part is installed inside the instrument, and its mechanical parts are small and compact, which is the most delicate and complicated part in the microscope. The fine-tuning part of the microscope should be repaired by professional technicians. If you are not sure enough, don't dismantle it casually.
3. Microscope objective lens converter troubleshooting
The main failure of the microscope nosepiece is the failure of the positioning device. Generally, it is caused by the damage of the positioning spring (deformation, breakage, loss of elasticity, loosening of the fixing screws of the spring, etc.). When replacing the new spring, do not tighten the fixing screws for the time being. Perform optical axis calibration first. After fitting the shaft, tighten the screws again. If it is an internal positioning converter, you should unscrew the big head screw in the center of the rotating disk and remove the rotating disk to replace the positioning spring. The method of optical axis correction 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 slide down)
(1) The lifting mechanism of the straight microscope condenser includes: 1.. Celluloid washer 2. Thumb screw 3. Eccentric gear rod sleeve 4. Gear rod 6. Lifting hand wheel 7. When adjusting the binocular nut, use both eyes with one hand Insert the nut wrench into the binocular nut on the end face of the hand wheel, and insert the screwdriver with the other hand into the notch of the thumb screw at the other end, and tighten it firmly to stop the slide.
(2) The lifting mechanism of the condenser of the oblique tube microscope:
When adjusting, first use a screwdriver to withdraw the resident screw in the middle of the binocular nut for 1 to 2 turns. The bearing washer is tightly fitted with the resident screw, so it will also withdraw with it and break away from the end face of the gear rod. Then, use the double-eye nut wrench to screw the double-eye nut into the adjustment seat. At the same time, use the other hand to turn the handwheel and carry out the test until the lifting mechanism is properly tightened and can stay at any position before stopping the screwing of the binocular nut. Finally, put the stop screw in again so that the bearing washer touches the gear rod.
The reason why such an adjustment can eliminate faults is because the inner hole of the adjustment seat is tapered. The tapered bushing has notches in the axial direction. When the double-eye nut 1 is screwed inward, the tapered sleeve is pushed inward, so that when the tapered sleeve advances, the notch becomes smaller, the inner hole shrinks, the gear rod is clamped tighter, and the friction of the gear rotation is increased. resistance, thereby stopping the automatic descent.
