Troubleshooting the mechanical device of a microscope
1. Troubleshooting of rough adjustment parts
The main malfunction of coarse adjustment is the automatic sliding or uneven tension during lifting. The so-called automatic sliding refers to the phenomenon of the mirror tube, mirror arm, or stage slowly falling down without adjustment when it is stationary in a certain position, under the action of its own weight. The reason is that the gravity of the mirror tube, mirror arm, or 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 mirror tube or arm itself
For the coarse adjustment mechanism of inclined tube and most binocular microscopes, when the mirror arm automatically slides down, you can hold the stop pulley on the inner side of the coarse adjustment handwheel with both hands, and tighten both hands in a clockwise direction to stop the sliding. If it does not work, you should seek professional repair
The automatic sliding of the mirror tube often gives people the illusion that it is caused by the loose fit between the gear and rack. Therefore, a gasket is added under the rack. This way, although the sliding of the mirror tube can be temporarily stopped, it causes the gear and rack to be in an abnormal biting state. As a result of the movement, both the gear and rack deform. Especially when the gasket is not flat, the deformation of the rack is more severe, resulting in some biting tightly and some biting loosely. Therefore, this method is not suitable
In addition, due to the long-term disrepair of the coarse adjustment mechanism, the lubricating oil is dry and uncomfortable during lifting, and even the friction sound of the machine parts can be heard. At this time, the mechanical device can be removed for cleaning, greased, and reassembled
2. Troubleshooting of fine-tuning parts
The common faults of the fine adjustment part are jamming and failure. The fine adjustment part is installed inside the instrument, and its mechanical parts are small and compact, making it a delicate and complex part of the microscope. The faults of the fine adjustment part should be repaired by professional technicians. Without sufficient assurance, do not disassemble it randomly
3. Troubleshooting the lifting mechanism of the condenser
The main fault in this part is also automatic sliding. The troubleshooting method is as follows:
(1) The lifting mechanism of the straight tube microscope condenser 1 5. Celluloid washer 2. Big head screw 3. Eccentric gear rod sleeve 4. Gear rod 6. Lifting handwheel 7. Double eye 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 insert a screwdriver into the slot of the large head screw on the other end. Tighten firmly to prevent slipping
When adjusting, first use a screwdriver to remove the stationary screw 2 in the middle of the double eye nut by 1-2 turns. The bearing washer 3 is tightly matched with the stationary screw 2, so it will also follow it and detach from the end face of the gear rod 10. Then, use a double eye nut wrench to insert the double eye nut 1 into the adjustment seat 5. At the same time, use the other hand to rotate the handwheel for testing until the lifting mechanism is properly tightened and can stay in any position, and then stop the double eye nut's rotation, Just insert the stationary screw again so that the bearing washer contacts the gear rod 10
The reason why this adjustment can eliminate the problem is that the inner hole of the adjustment seat 5 is conical. The conical shaft sleeve 4 has a groove in the axial direction. When the double eye nut 1 is screwed in, the conical sleeve is pushed inward, causing the groove to become smaller and the inner hole to shrink, clamping the gear rod 10 tighter, increasing the frictional resistance of the gear rotation and preventing automatic descent
