Bearings: Qualified ball bearings, made of high-quality bearing steel, whose inner and outer rings and cages are bright as mirrors after wiping off rust-proof oil, and have a glass-like smooth and delicate feel when touched; outer ring faces are engraved with code names. The origin, origin and date of manufacture are uniform. The rivet head is not biased. If the inner ring is supported by hand, the outer ring is rotated by the other hand, and the outer ring is marked. The stop position of the mark is different when each stop, and the inner and outer rings are pinched by both hands so that they are opposite to each other in the radial and axial directions. Movement, no sense of clearance, only the larger bearing can feel the gap, but no metal impact sound. After completion of the above inspection and decision to purchase, a hardness test may be performed (compared with the merchant first, if the hardness does not meet the requirements, return): use a file or a hacksaw to break or draw the outer and inner rings of the bearing and issue it. The "grilled" sound and no swarf, scratches or only insignificant fines are acceptable. On the contrary, it is a nonconforming product. Oil Seal: Qualified rubber seal surface smooth, no defect deformation, the side of the code, specifications and manufacturers and other signs, the entire circumference of the oil seal on the edge shape, thickness consistent, and the supporting frame of the oil seal shape is correct, the end face is round, Can be attached to the flat glass surface without flexing; no skeleton oil seal is upright, and it is deformed by hand, and can be restored after loosening; the spring with oil spring seal should be no rust, no deformation, the spring tightly closed in the lip no loose Chi, if the oil seal has a bad shape, defect, elasticity, uneven thickness of the lip, lack of spring corrosion and other phenomena, indicating that the quality is not qualified. V-belt: The qualified V-belt surface is smooth and the joints are glued seamlessly. On the outer circumference there are clear logos, specifications, manufacturer's names, etc., and a group of V-belts have the same length. If the V-belt has a rough appearance, the joint is not even or open, the edges of the joint are exposed, there is no mark or the logo is blurred, and the V-belts are of different lengths, which indicates that they are counterfeit. V-belt wheel: The surface of the qualified V-belt wheel is free of air holes and cracks. The V-belt groove is smooth. When the V-belt buckles the V-belt groove, the V-belt is slightly higher than the notch and the bottom of the V-belt is not in contact with the groove bottom. If a V-belt is found The wheel groove has a porosity defect, and the shape of the groove surface is not matched with the V band, which is a bad part. Tires: Qualified tires have logos, models, layers, and cords on both sides of the tire. They are clear and eye-catching, and some have a production number and a capped inspection seal. The inner surface of the tire is bright and bright. bouncy. If the surface of the tire is incomplete or fuzzy, the inner tube is dull, the carcass is thin and the thickness is uneven, and the hand is inelastic, it is a defective product. Threaded parts: Approved products are smooth, non-corrosive, no defects, continuous screws, no burrs, no cracks. The test piece is screwed together with the standard fitting and can be screwed to the terminal, and there is no seizure during the precession process; after the rotation, the connection piece is toggled without shaking and impact sound. If the screw has defects such as rust, cracks, and burrs, it is a bad product. Gears: Qualified gears are well-packed, tooth surfaces and grooved surfaces are smooth without nicks, burrs, and coated with rust-proof oil or wax. The side of the gears are usually code-named steel; the gears are cut with a hacksaw blade. Work surface, no scratches or only fine scratches. If the gear surface has punctures, cuts, and rust, there are crumbs and scratches (vertical axis) when it is set flat. Use two fingers to hold the middle of the chain slowly. When both ends of the chain start to leave the glass plate, stop. As mentioned above, the middle of the chain should be less than 10mm away from the glass plate. Otherwise, the gap is too large to be purchased. Piston ring: The surface of the qualified parts is fine and smooth, no manufacturing defects, no distortion, and good elasticity; when the edges of the piston ring are marked with the broken edge of the hacksaw blade, the edges and corners of the rings are not damaged. Filter: qualified filter paper filter pore gap between 0.04-0.08mm, filter arranged in an orderly manner, hard and firm, no deformation after oil absorption; filter core tube with high quality steel, the hole size is moderate, obtained From the oil pressure, not easily deformed. If the filter paper is soft and disorderly, the mesh size is not the same, and the filter paper and the upper and lower contact disks are not glued together, indicating poor quality, do not purchase it.
Wound Drainage System,Drainage Bag,Disposal Bag
Respiratory Series Wound Drainage System Co., Ltd. , http://www.nsrespiratory.com