Troubleshooting of mechanical device faults
1. Troubleshooting of rough adjustment faults
The main malfunction of rough adjustment is the uneven tension during automatic sliding or 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 influence of its own weight. The reason is that the gravity of the mirror tube, mirror arm, and stage itself is greater than the static friction force. The solution is to increase the static friction force to be greater than the gravity of the mirror tube or arm itself.
For the coarse adjustment mechanism of oblique 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 it clockwise with force to stop the sliding. If it does not work, professional personnel should be sought for 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. So we added shims under the rack. In this way, although the sliding of the mirror tube can be temporarily stopped, it causes the gears and racks to be in an abnormal biting state. The result of motion causes both the gears and racks to deform. Especially with uneven padding, the deformation of the rack is even more severe, resulting in some biting tightly and some biting loosely. Therefore, this method is not suitable for use.
In addition, due to the long-term disrepair of the rough adjustment mechanism, the lubricating oil is dry, and there is an uncomfortable feeling when lifting, and even the friction sound of the machine parts can be heard. At this point, the mechanical device can be removed for cleaning, greased, and reassembled.
2. Troubleshooting of minor adjustments
The most common faults in fine-tuning are jamming and failure. The fine-tuning part is installed inside the instrument, and its mechanical parts are small and compact, making it the most delicate and complex part of the microscope. The faults in the fine-tuning part should be repaired by professional technicians. Don't dismantle it randomly without sufficient confidence.
3. Troubleshooting of objective lens converter faults
The main malfunction of the objective lens converter is the malfunction of the positioning device. It is generally caused by damage to the positioning spring plate (deformation, fracture, loss of elasticity, loosening of the fixing screws of the spring plate, etc.). When replacing the new spring plate, do not tighten the fixing screw temporarily. Instead, perform optical axis correction according to "3 (2) 2" in this section. After the shaft is assembled, tighten the screws again. If it is an internal positioning converter, the large head screw in the center of the rotating disc should be unscrewed, and the rotating disc should be removed before replacing the positioning spring plate. The method of optical axis correction is the same as before.
4. Troubleshooting of the lifting mechanism of the concentrator
The main malfunction in this section is also automatic sliding. The exclusion method is as follows:
(1) The lifting mechanism of the straight tube microscope condenser is shown in Figure 10-3-2: 1 5. Celluloid washer 2. Big head screw 3. Eccentric toothed rod sleeve 4. toothed rod 6. Lifting handwheel 7. Double eye nut
When adjusting, use one hand to insert the double nut wrench into the double 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 stop the sliding.
(2) The lifting mechanism of the oblique tube microscope concentrator is shown in Figures 10-3-3:
When adjusting, first use a screwdriver to remove the retaining screw 2 in the middle of the double eye nut by 1-2 turns. The bearing washer 3 is tightly matched with the retaining screw 2, so it will also be removed along with it and detach from the end face of the gear rod 10. Then, use a double eye nut wrench to screw double eye nut 1 into the adjustment seat 5. At the same time, use the other hand to rotate the handwheel and conduct the experiment until the lifting mechanism is properly tightened and can stay in any position, then stop the double eye nut from being screwed in. Finally, insert the stationary screw again so that the bearing washer contacts the gear rod 10.
