1, the use of metal buckle legal
Metal fastening is the use of plastic deformation of metal materials (wave keys) to complete the deduction, in order to achieve the cracking and fracture repair purposes. The metal buckle can be used for the repair of steel parts that are not easy to be welded, the castings that do not allow large deformation, and the repair of non-ferrous metal parts. The repair effect of large-size castings is more prominent. According to the nature and characteristics of the fastening, it can be divided into four processes: strong fastening, strong fastening, excellent fastening and heat fastening.
(1) Strong fastening process: The strong fastening is suitable for the thin-walled parts that require the general strength of the wall thickness of 8-40mm. Process implementation method: 1 According to the waveform of the flange structure of the key to create a drilling model. Drill holes in the direction perpendicular to the crack or fracture surface using a jig. Note that the drill hole is positioned using the first hole. 2 Use a chisel to machine the wave groove. During processing, it must be noted that the gap between the slot and the key must be between 0.1 and 0. Less than 2ram. 3 Apply epoxy adhesive around the waveform keys and embed in the wave groove. 4 Rivet the flange of the embedded waveform key. Riveting strength should be weakened from the two ends to the middle flange.
(2) Strong fastening process: It is based on the strong and solid fastening, processing the sew hole in the line of cracks or fractures between the two wavy keys, and making the second drill's sew hole Slightly etched waveforms and embossed plugs have been installed to form a sealed "metal ties" to prevent fluid leakage. The splice plug can be made of a soft material such as low carbon steel or pure copper with a diameter of 5 to 8 mm, which facilitates the riveting.
(3) High-level fastening process: The high-grade fastening is mainly used to repair thick-walled parts that are required to withstand high loads during the working process, such as hydraulic press beams, rolling mill main beam rollers and so on. To distribute the load over more area and away from cracks or breaks, steel stiffeners must be embedded in the direction perpendicular to the cracks or fractures, connected by sew bolts, and sometimes reinforced with wave keys.
(4) Heat-snapping process: The heated fastener is used to shrink during cooling to lock the cracked component. The law is applicable to the repair of cracks and fractures in the fuselage of large flywheels, gears and heavy equipment.
2, using inlay parts repair method
After mating parts wear, under the conditions permitting the structure and strength, add a part to compensate for the parts removed due to wear and repair, in order to restore the original part accuracy, this method is called inlay parts repair method.
3, the use of local repair method
In the course of use of some parts, the amount of wear in each part is often uneven, and some parts are only heavily worn, while others are still good or slightly worn. If the structure of the part allows, the severely worn part can be cut off, and the new part can be fixed on the original part by means of mechanical connection, welding or bonding. The method of repairing the part is called partial replacement.
In summary, correct fault diagnosis is a key link to ensure the reasonable repairing process and quality of agricultural machinery. Through diagnosis and determination of the technical status of parts and taking necessary remedial measures, a reasonable repair method is to restore the original agricultural machinery. Mechanical properties and reliable guarantee for extending the service life of agricultural machinery.
4, using plastic deformation repair method
Plastic deformation repair parts generally have the following methods:
(1) Upsetting method: The outer diameter of the part is increased by means of pressure to compensate for the worn part of the outer diameter. It is mainly used to repair non-ferrous metal sleeves and cylindrical parts. The wear amount of the inner or outer diameter can be repaired less than 0.6 ram. Components.
(2) Extrusion method: The use of pressure to squeeze the parts of the parts that do not need to strictly control the size of the parts to the worn parts, is mainly applied to the repair of the inner diameter of cylindrical parts.
(3) Expanding expansion method: The principle of this method is the same as that of the extrusion method except that the parts are compressed and expanded outward to increase the external dimensions and compensate for the worn portion. Mainly used in outer sleeve wear parts.
(4) Pressure straightening method: The parts are straightened by pressure, and the straightening must be overcorrected. In this way, the amount of bending deformation of the parts is offset only by the amount of plastic deformation produced in the straightening under the overcorrection condition.
(5) Sniper alignment method: By tapping the low part of the bending on the part, the metal material is extended, and the stretched plastic deformation occurs at the surface where the part bends low, thereby changing the internal stress distribution of the bending part of the part. , straighten the bend. .
(6) Flame straightening method: The highest point of the part is quickly heated by the gas welding acetylene flame, and the surface layer metal of the part will rapidly expand to make the part deepen the bending. Around the heating point and the lowest point of the bending, the cold metal part will Limit the expansion of the metal at the heating point. As a result, the heated metal is squeezed and plastically deformed at high temperatures. The metal at the heating point actually shrinks. When the heating point rapidly cools, it will inevitably cause the part to reverse bending.
Control of coccidiosis:
Control of chicken Eimeria disease.
Coccidiosis is a parasite disease, which can cause serious loss of meat and egg production in domestic poultry. The multiplication of parasites in small intestine leads to the prevention of damage, reduction of intake and nutrient absorption rate in feed, dehydration and blood loss. Coccidiosis is caused by Eimeria, a single cell parasite. Eimeria's life cycle is about 4-7 days. Eimeria's life began when the active egg sac was eaten and eaten by chickens. An "egg sac" is a capsule with a thick protective layer to protect the parasites. They are "spores" or uninfective, but if the humidity, temperature or oxygen are appropriate, they start to grow. After the chicken took the egg sac, the coccidiosis was implanted in the intestine, and the cells were embedded several times and multiplied, which damaged the tissue.
Antibiotics: This kind of medicine mainly includes monensin, lasalleomycin, salinomycin, naramycin, Maduramycin, Hainanmycin and so on. The mechanism of action is as follows: there is one organic acid group and several ether groups in the molecular structure of the drug, which is negatively charged in the solution. It can combine with sodium, potassium, calcium, magnesium and other cations that play an important role in the body to form fat soluble complexes, improve the permeability of the insect cell membrane to potassium, sodium, calcium, magnesium plasma, and assist the cation to enter the body, This kind of medicine belongs to insecticidal drugs, because it can form a large osmotic pressure difference inside and outside the cell, water enters in a large amount, and the body cell of the insect expands, breaks and dies. These drugs can also interfere with the transport of nutrients through the cell membrane, limit the absorption of sugars by parasites, and inhibit the growth and development of parasites. Therefore, they have a wide spectrum of coccidiosis resistance. There are cross resistance and cumulative effect between these drugs, but no synergistic effect.
Eimeria tenella and Eimeria virulent, In ducks and geese coccidia of the genus Taize and Eimeria, e foE. arloigni and E. faurei in sheep and goats, Eimeria skrjabini of rabbit
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