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Ventilation works expand each tube cutting basic steps and methods of

Update Time :2015-07-25The view :427

The basic steps to start unloading is: familiar with the drawings, shape analysis, seeking real real long-shaped cable or plane determined expansion method to expand and draw maps.

A familiar drawing

Before the commencement of cutting, first to seriously familiar with the construction drawings, understand the need to expand the contents of the tube pieces or parts, which parts of the project in the ventilation system, with which the tube is connected to it on the drawing size, with which material system

456棋牌 For more. For complex fittings and components to be repeated on the construction plans carefully read and analyzed, must all understand, if there is an error or read drawings or poorly designed, presented to the authorities.

Second, the physical analysis

Ventilation and air-conditioning in the shape of the material under process ventilation engineering fittings and components, although complex and diverse, but by some simple geometry of the composition. They are generally mostly housing types, types, expand the method is different. Therefore, the analysis of the complex geometry is molded into simpler geometry process by decomposition, we will be able to find the right expansion method.

There are curved shell casing and two flat housing.

(A) flat housing

Surface of the case by a group called the flat planar graph consisting of housing, it is divided into prismatic and pyramidal. Ridgeline parallel to each other prismatic housing, pyramid-shaped housing of the ridge intersect at one point. Depending on how much the ridge, which is divided into Tuen prismatic, cylindrical and rectangular flower pyramid shape, quadrangular conical shell.

I1 bottom of a regular polygon, ridgeline plane perpendicular to the bottom port of prismatic housing, called the positive prism housing.

456棋牌 Bottom port is a regular polygon and vertex projection cone bottom polygon of "coincidence pyramid-shaped housing" is called positive pyramid-shaped body; pyramid-shaped housing projection cone vertex and polygon center does not coincide with the end of the mouth, called oblique conical shell. By clipped shaped by the prism, pyramid-shaped body to produce a variety of housing. One or more planar or curved clipped each part of the divided body called the frustum.

(B) Surface housing

456棋牌 Curved surface, or surface, flat surface of the housing is called housing both. Surfaces of the housing can be divided into rotating and non-rotating housing shell off. Rotating the housing can be divided into cylindrical, spherical, conical housing being. Non-rotating housing may be divided into oblique conical, elliptical, irregular surface of the housing.

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