The standing treatment of the in-position compression spring is to press the spring to the standing height several times, that is, to compress the spring to the degree of the circle (pressure and height). Usually, the pressure is specified three to five times, and then the length is corrected. The free height of the spring is relatively stable and does not cause permanent deformation under the test load. The investigation found that some spring manufacturers only set pressure for one press, not to press and height, which can shorten the prefabrication height of the spring and save materials, but it will definitely become shorter, softer or bent during driving. phenomenon.
The surface blasting treatment of the spring surface is not in the position of shot blasting. The surface of the spring is sprayed at a high speed projectile to plastically deform the surface layer of the spring to form a surface strengthening layer of a certain thickness to improve the fatigue strength of the spring, generally increasing the fatigue strength of the spring by 20%. A 35%. Some spring production companies that the author visited, some have no shot blasting equipment, some only small shot blasting machines, small springs can be shot blasting, big springs can't do. For this reason, the spring without shot blasting is naturally much lower in fatigue strength. The number of transitions is less. The spring bending deformation often occurs at the junction of the tight circle and the sparse circle. Therefore, when the spring is produced, the transition from the dense ring to the sparse ring should be slowly transitioned, and the transition zone and the number of transition turns can be increased, so that the bending deformation can be reduced. In order to save trouble, some spring manufacturers have made a transition from a tight circle to a sparse circle. This kind of spring, especially a spring with a large difference in the pitch of the sparse ring, is most likely to bend at the junction of the dense circle. Manually grinding the spring end face can not guarantee the verticality of the spring busbar. Some spring manufacturers do not use the grinding spring machine to grind the end face, but use the hand-grinding spring end face, which often exceeds the tolerance of the verticality; plus the precision of the coil spring machine is not high, The spring straightness is not good and the pitch is not uniform, which is very likely to cause the spring to bend and deform.
Rotary evaporator rotovap machine is for evaporation and crystallization under vacuum pressure
Chemistry rotary evaporator concentrator or evaporator crystallizer with different material such as high borosilicate glass rotary evaporator and stainless steel evaporators and always used for lab chemical chemistry use or beverages, sample pharmaceutical engineering
Laboratory instruments rotary evaporators are mainly used for continuous distillation of large quantities of volatile solvents under reduced pressure. In particular, the reaction products can be separated and purified by the concentration of extraction solution and the distillation of the receiving solution during chromatographic separation. The basic principle of a rotaryvaporizer is reduced pressure distillation, that is,under reduced pressure, when the solvent is distilled, the distillation flask is continuously rotating
Structure: The distillation flask is a pear-shaped or round-bottom flask with a standard grinding interface, connected to a pressure relief pump by a high reflux serpentine condensing tube, and another opening of the reflux condensing tube is connected to a receiving flask with a grinding mouth for receiving the evaporated organic solvent. There is a three-way piston between the condensing tube and the decompression pump. When the system is communicated with the atmosphere, the distillation flask and the liquid flask can be removed and the solvent can be transferred. When the system is communicated with the decompression pump, the system should be in the state of decompression. When using, it should be DECOMpressed first, and then start the motor to rotate the distillation flask. At the end, it should be shut down first, and then air through to prevent the distillation flask from falling off in the rotation. As a heat source for distillation, it is often equipped with a corresponding constant temperature water tank.
Glass reactor mainly uses its double layer of glass characteristics, we can place the reaction material in the middle of the sandwich, through the atmospheric pressure or negative pressure under the condition of stirring reaction. In this way, the medium inside the interlayer of the glass reactor (such as freezing liquid, heating water or heating oil) can be heated or cooled by stirring in a circular reaction. It is widely used as an ideal equipment in modern biochemical new material synthesis experiments
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