Biological microscope is a kind of precision optical instrument commonly used in biology teaching experiment, which is composed of mechanical system and optical system. The mechanical system includes: the lens barrel transmission part, the objective lens rotating part, the stage, the conversion part of the tablet clamp and the shutter, the rotating part of the frame and the base, etc. Clinical laboratory Optical systems include: eyepieces, objective lenses, condensers, and mirrors. Clinical laboratory 1. Maintenance and care 1. Overall maintenance: The biological microscope should be placed in a dry, cool, dust-free and non-corrosive place. After use, wipe it off immediately, cover it with a dustproof breathable cover or put it in a box. 2. Maintenance of the mechanical system: After use, wipe it with a clean fine cloth, and regularly apply some neutral grease to the sliding part. If there is serious pollution, it can be washed with gasoline and then dried. But do not use alcohol or ether to clean, because these reagents will corrode machinery and paint, causing damage. Clinical laboratory 3. Maintenance of the optical system: After use, gently wipe the lenses of the eyepiece and objective lens with a clean soft silk cloth. When there are stains that cannot be wiped off, use long-fiber absorbent cotton or a clean fine cotton cloth dipped in a little dimethyben or lens cleaning solution (3 parts alcohol: 1 part ether) to wipe. Then wipe dry with a clean and soft silk cloth or blow dry with a blower ball. It should be noted that the cleaning solution must not penetrate the inside of the objective lens, otherwise the objective lens will be damaged. The condenser lens (only available for XSP-12A and 16A models) and reflector need only be cleaned after use. Clinical laboratory Second, the removal of common faults 1. Self-slip of the lens barrel: This is one of the failures that often occur in biological microscopes. The solution to the microscope with shaft sleeve structure can be divided into two steps. Step 1: Hold the two coarse adjustment handwheels with both hands and tighten them relatively hard. See if you can solve the problem. If you still can't solve the problem, you need to use a special two-post wrench to unscrew a coarse handwheel and add a friction plate. Too thick, you can replace a thin one. With the handwheel turning effortlessly, the lens barrel moves up and down easily without sliding down by itself. Friction plates can be punched with a puncher using waste photographic film and soft plastic sheets less than 1 mm thick. Step 2: Check the meshing state of the gear on the coarse adjustment handwheel shaft and the rack on the lens barrel. The up and down movement of the lens barrel is completed by the gear driving the rack. In theory, the optimal meshing state of the gear and the rack is that the dividing line of the rack is tangent to the dividing circle of the gear. In this state, the gear rotates easily, and the wear on the rack is minimal. There is a wrong way to add a shim after the rack to make the rack tightly press the gear to prevent the lens barrel from sliding down. At this time, the dividing line of the rack and the dividing circle of the gear intersect, and the tooth tips of the gear and the rack tightly bear against the tooth root of the other side. When the gears rotate, severe grinding will occur between each other. Since the rack is made of copper, the gear is made of steel. Therefore, the grinding between each other will damage the teeth on the rack, and many copper chips will be generated on the gear and the rack. Finally, the rack will be severely worn and unusable. Therefore, the rack should not be used to prevent the lens barrel from sliding down. Solving the problem of the lens barrel sliding down by itself can only be achieved by increasing the friction between the coarse adjustment hand wheel and the eccentric shaft sleeve. Clinical laboratory But there is one exception, that is, the dividing line of the rack is separated from the dividing circle of the gear. At this time, when the coarse adjustment hand wheel is turned, the phenomenon of slipping will also occur, which affects the up and down movement of the lens barrel. If this is done by adjusting the eccentric bushing of the coarse handwheel, the meshing distance between the gear and the rack cannot be adjusted. It can only be solved by adding an appropriate sheet after the rack. The standard for adjusting the meshing distance between the gear and the rack by adding a shim is: it is not difficult to turn the coarse handwheel, but it is not idling. After adjusting the distance, add some neutral grease between the gear and the rack. Just move the lens barrel up and down a few times. Finally, the two compression screws on the eccentric bushing must be tightened. Otherwise, when the coarse adjustment handwheel is turned, the eccentric bushing may rotate with it, and the rack is stuck, so that the mirror can not move up and down. At this time, if the force of turning the coarse adjustment hand wheel is too large, the rack and the eccentric bushing may be damaged. After tightening the screw, if you find that the eccentric bushing still rotates. This is because the screw hole thread of the compression screw is not changed. Because manufacturers change the thread by machine, often one or two threads are not changed in place. At this time, even if the screw is not screwed in place, the eccentric bushing will not be pressed. Found this kind of fault, as long as the thread of the screw hole is penetrated by the M3 wire tap, the problem can be solved. I used this method to completely solve the problem of eccentric shaft sleeve rotation of 30 biological microscopes in our school. After all the above steps are completed, the problem of the lens barrel sliding down is basically completely solved.
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