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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.
The present invention provides a multifunctional pull faucet, comprising: a faucet body, a drawing part is provided at the water outlet port thereof, and the drawing part is connected to a main channel, wherein at least three are provided in the faucet body A branch channel, and the three branch channels are all connected to the main channel. A multifunctional pull faucet provided by the present invention, wherein the hot water channel, the cold water channel and the water purification channel (pure water channel) are all connected to the main channel , And the main channel is connected with the drawing part on the main body of the faucet, so that the drawing part can obtain the water quality (hot water, cold water, purified water or pure water) required by different users, thereby improving the user experience, and , By integrating the hot water channel, cold water channel and pure water channel (pure water channel) into the main channel, the internal structure of the faucet is simplified, and the production cost of the faucet is reduced.
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