Troubleshooting of Microscope Mechanism
1. Fine-tuning and troubleshooting
The most common faults in the fine-tuning part are stuck and failed. 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. Faults in the fine-tuning part should be repaired by professional technicians. If you are not sure enough, don't dismantle it casually.
2. Troubleshooting of coarse adjustment part
The main failure of coarse adjustment is that the tension is different when it is automatically lowered or lowered. 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 its own weight 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 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 in a clockwise direction to stop the slide. . If it doesn't work, you should find a professional to repair it.
The lens barrel automatically slides down, which 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. In this way, though the sliding of the lens barrel can be stopped temporarily, the gear and the rack are in an abnormal meshing state. 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 coarse adjustment mechanism and the dry lubricating oil, 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
3. Troubleshooting of objective lens converter
The main failure of the objective lens converter is the failure of the positioning device. Generally, it is caused by severe damage to the positioning bomb. When replacing the new bomb, do not tighten the fixing screw for the time being, and perform optical axis correction according to "3 (2) 2" in this section. 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 bullet. The method of optical axis correction is the same as before.
4. Troubleshooting of the concentrator lifting mechanism
The main glitch in this part is also the automatic slide. The exclusion method is as follows:
(1) The lifting mechanism of the straight microscope condenser is shown in Figure 10-3-2: 1. 5. Celluloid washer 2. Thumb screw 3. Eccentric gear rod sleeve 4. Gear rod 6. Lifting handwheel 7. Eyes nut
When adjusting, use one hand to insert the double-eye nut wrench into the double-eye nut on the end face of the handwheel, and the other hand to use a screwdriver to insert into the notch of the big head 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 2 in the middle of the binocular nut for 1-2 turns. Then, screw the binocular nut 1 into the adjusting seat 5 with a binocular nut wrench. 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 contacts the gear rod 10.
The reason why such adjustments can eliminate faults is because the inner hole of the adjusting seat 5 is tapered. The tapered shaft sleeve 4 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 10 is clamped tighter, and the gear rotation force is increased. frictional resistance, thereby preventing automatic descent.
