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Conical head
Conical head

Conical head

Conical head is the head with conical surface of shell. It is characterized by uniform change of speed of mediu...
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Conical head is the head with conical surface of shell. It is characterized by uniform change of speed when the medium passes through, which is convenient to discharge the viscous liquid and material containing solid particles. However, its mechanical properties are poor, and the discontinuous stress caused by shape mutation at the joint with the cylinder or pipe is large. In order to reduce the discontinuous stress, the circular arc transition flanged structure or local thickening structure can be used at the large or small end of the conical shell. The design specifications of pressure vessels in China require: when the half-cone Angle is greater than 30°, the large end of the conical shell should adopt the flanged structure; When the semi-conical Angle is greater than 45°, the small end of the conical shell shall adopt the flanged structure. Due to the large thickness of the conical head wall, it is not convenient to manufacture, and it is only adopted when the process requires.

Cone head material

The tapered head can be made of carbon steel, low-alloy steel, composite plate, stainless steel, copper, aluminum, titanium and other non-ferrous metals. The standard is GB/T 25198-2010.

Use for cone head

Under the action of internal pressure, the stress of the thin film occurs at the large end. Due to geometric discontinuity and abrupt curvature radius at the joint of cone and cylinder, greater lateral thrust will be generated there, leading to greater edge stress and easy bending. Therefore, it needs to be strengthened. For large end, axial bending stress is the main control factor, and belongs to secondary stress, so the stress intensity is controlled. For the small end, the stress condition at the connection between the small end and the cylinder is mainly the mean circumferential tensile stress and the mean radial compressive stress, which belong to the local thin film stress, so the stress intensity can be controlled. However, since the local thin film stress here may exceed the distribution range of the edge effect, the stress intensity is taken to be controlled within. For the large end, the thickness of the reinforcing section should not be less than the conical shell thickness connected, the length of the reinforcing section should not be less than, the length of the cylinder reinforcing section should not be less than. For small ends, the thickness of the reinforcing section should not be less than that of the conical shell connected with each other under any circumstances, and the length of the conical shell reinforcing section should not be less than that of the cylinder reinforcing section.