Microscope Mechanical Device Failure

- Nov 25, 2019-

Exclusion of coarse adjustment part

The main fault of the coarse adjustment is that it is automatically slipped or lifted when it is lifted. The so-called automatic sliding refers to the phenomenon that the lens barrel, the mirror arm or the stage is automatically lowered slowly under the action of its own weight without being adjusted when it is stationary at a certain position. The reason is that the gravity of the microscope objective barrel, the mirror arm, and the stage itself is greater than that caused by static friction. The solution is to increase the static friction force to be greater than the gravity of the lens barrel or the mirror 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 pulleys on the inside of the coarse handwheel with both hands, and tighten the hands in a clockwise direction to stop the sliding. . If it doesn't work, you should find a professional to repair it.

The lens barrel automatically slides down, often giving people the illusion that it is caused by the looseness of the gear and the rack. Then put a gasket under the rack. Thus, although the sliding of the lens barrel can be temporarily stopped, the gear and the rack are in an abnormally engaged 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 severe, and as a result, a part of the bite is tight and a part of the bite is loose. Therefore, this method should not be used.

In addition, due to the long-term disrepair of the coarse adjustment mechanism, the lubricating oil is dry, and it will feel uncomfortable when lifting lab jack, and even the friction of the machine can be heard. At this time, the mechanical device can be removed and cleaned, and the grease can be reassembled.

Fine-tuning partial troubleshooting

The most common faults in the fine-tuning section are stuck and failed. The trimming section is mounted inside the instrument and its mechanical parts are small and compact, making it the most sophisticated part of the microscope. The failure of the fine adjustment part should be repaired by a professional technician. Don't have enough confidence, don't just break it.

Removal of the objective lens converter

The main failure of the objective lens converter is that the positioning device fails. Generally, the positioning spring piece is damaged (deformation, breakage, loss of elasticity, looseness of the fixing screw of the spring piece, etc.). When replacing the new spring piece, do not tighten the fixing screw. After the shaft is closed, tighten the screw. In the case of a manual rotation platform, the cap screws in the center of the rotating disk should be unscrewed, and the rotating disk can be removed to replace the positioning spring piece. The optical axis correction method is the same as before.

Elimination of malfunction of concentrator lifting mechanism

The main fault in this part is also automatic decline. The troubleshooting method is as follows: When the double-eye nut of the lift of the straight microscope concentrator is adjusted, one hand is inserted into the double-eye nut on the end face of the hand wheel with a double-eye nut wrench, and the other hand is inserted into the notch slot of the other end with a screwdriver. tighten tightly to stop the downturn.