CN103170773B

CN103170773B - Assembly method for ensuring equipment overall coaxiality in pressure vessel for chemical industry

Info

Publication number: CN103170773B
Application number: CN201310081715.XA
Authority: CN
Inventors: 李耀平; 丁尧新
Original assignee: Shanghai Boiler Works Co Ltd
Current assignee: Shanghai Boiler Works Co Ltd
Priority date: 2013-03-14
Filing date: 2013-03-14
Publication date: 2015-05-13
Anticipated expiration: 2033-03-14
Also published as: CN103170773A

Abstract

The invention provides an assembly method for ensuring equipment overall coaxiality in a pressure vessel for chemical industry. At first, U-V-shaped grooves are processed at two ends of each tube sections to be assembled, and then reference surfaces are processed below V-shaped grooves of the U-V-shaped grooves on the inner wall of the tube sections, an axis of each tube section is simulated according to the reference surfaces of two ends of the tube section as measuring basis, and when tube sections are assembled, the axis of each tube section is located on the same straight line. According to the assembly method for ensuring equipment overall coaxiality in the pressure vessel for the chemical industry, defects of the prior art are overcome, overall coaxiality of the equipment can be ensured, assembly accuracy is improved, and product quality and manufacturing efficiency are guaranteed.

Description

The assembly method of Whole Equipment axiality is ensured in a kind of pressure vessels for the chemical industry

Technical field

The present invention relates to the assembly method ensureing Whole Equipment axiality in a kind of pressure vessels for the chemical industry, belong to the mounting technology field of pressure vessels for the chemical industry.

Background technology

For the large-scale tower equipment in chemical industry equipment, such as: ammonia convertor, methanol reactor etc., because the matching requirements of internals and housing are very high, housing is relatively long again, and internals are generally overall pattern hangs in housing, for guaranteeing that internals and housing can accurately, successfully be in place, this just proposes very high requirement to the overall axiality of apparatus casing.

If what device housings adopted is forge welding structure, so the axiality of housing is just relatively easy ensures; If what device housings adopted is plate welding structure, ensure that the axiality of housing is just more difficult.For the large-scale tower equipment adopting plate welding structure, according to the conventional method, the axiality of assembling process middle shell is by adopting the method for measuring cylinder body circular seam unfitness of butt joint to control, the equipment that this method is low to concentricity requirement can meet, but for the large-scale tower equipment of plate welding structure, be then difficult to reach requirement.If assemble by above method and weld appropriate after, find dimension overproof, the method for can only ressemble by excluding weld seam, welding makes up, and not only reprocesses complex procedures, greatly can increase manufacturing cost, also can extend the manufacturing cycle of product simultaneously, impact delivery.

Summary of the invention

The technical problem to be solved in the present invention is to provide the assembly method ensureing Whole Equipment axiality in a kind of pressure vessels for the chemical industry, to improve assembly precision, ensures the quality of product and manufactures efficiency.

In order to solve the problems of the technologies described above, technical scheme of the present invention is to provide the assembly method ensureing Whole Equipment axiality in a kind of pressure vessels for the chemical industry, it is characterized in that: the method is made up of following 4 steps:

Step 1: at all shell ring two ends processing UV grooves to be assembled;

Step 2: processing datum below the double V-groove of shell ring inwall UV groove;

Step 3: using the datum level at shell ring two ends as measuring basis, simulates the axis of each shell ring;

Step 4: when assembling between shell ring, makes the axis of each shell ring be positioned at same straight line.

Preferably, in described step 1, the width of datum level is 5 ~ 10mm.

Preferably, the method simulating the axis of shell ring in described step 3 is: evenly get 8 points in the circumference of datum level, is circumferentially connected between two by the point apart from one another by three points, simulates the center of circle of datum level, connect the center of circle of two datum levels at shell ring two ends, be the axis of shell ring.

The actual size that the assembly method of Whole Equipment axiality rolls according to each shell ring is ensured in a kind of pressure vessels for the chemical industry provided by the invention, match between each shell ring, the unfitness of butt joint produced in strict control assembling process, ensure that the axiality of Whole Equipment meets technical requirement.

Method provided by the invention overcomes the deficiencies in the prior art, can ensure that the axiality of Whole Equipment meets technical requirement, improve assembly precision, ensure that the quality of product and manufactures efficiency.

Accompanying drawing explanation

Fig. 1 is shell ring two ends processing UV groove and datum level schematic diagram;

When Fig. 2 is single shell ring determination least radius, schematic diagram is chosen in cross section;

When Fig. 3 is two shell ring determination least radiuses, schematic diagram is chosen in cross section;

Fig. 4 is 4 shell ring assembling schematic diagrames;

Fig. 5 is 6 shell ring assembling schematic diagrames;

Fig. 6 is 7 shell ring assembling schematic diagrames;

Description of reference numerals

1-UV groove; 2-datum level.

Detailed description of the invention

For making the present invention become apparent, hereby with a preferred embodiment, and accompanying drawing is coordinated to be described in detail below.

For ensureing that shell ring can meet the requirements such as axiality that technical requirement specifies and linearity when assembling, first to ensure that the blank size of shell ring steel plate is accurate, the parameter such as ovality, linearity in strict control shell ring roll bending process, in addition, should ensure that the internal diameter size of each shell ring is identical as far as possible, avoid shell ring to occur the situation of large osculum.

Ensure in a kind of pressure vessels for the chemical industry that the assembly method of Whole Equipment axiality is made up of following 7 steps:

Step 1: as shown in Figure 1, at all shell ring two ends processing UV grooves 1 to be assembled.

Step 2: because shell ring adopts steel plate to roll, certain ovality can be produced, the accuracy of measuring basis during for ensureing shell ring assembling, below the double V-groove of shell ring inwall UV groove 1, working width a is the datum level 2 of 5 ~ 10mm, for centering center during optical measurement in follow-up assembling process.

Step 3: using the datum level 2 at shell ring two ends as measuring basis, simulate the axis of each shell ring.

Method is: evenly get 8 points in the circumference of datum level 2, circumferentially the point apart from one another by three points is connected between two, be about to be positioned at same diameter or connect between two close to the point of same diameter, simulate the center of circle of datum level 2, connect the center of circle of two datum levels 2 at shell ring two ends, be the axis of shell ring.

Composition graphs 4, can adopt the form of 2+2 during 4 shell ring assemblings; Composition graphs 5, can adopt the form of 4+2 during 6 shell ring assemblings; Composition graphs 6, can adopt the form of 6+1 during 7 shell ring assemblings.

Measure the perpendicularity of root face place plane and axis, meet technical requirement.

Measure the least radius relative to axis, the cross section minimum for radius is segmented, and determines that least radius distributes, so that the installation of follow-up internals.Composition graphs 2, the concrete measuring method of least radius is: respectively survey 1 point at the hoop minor axis place of each shell ring and left and right 300mm, major axis place respectively surveys 1 point (namely 8 points are surveyed in each cross section), axially survey 3 uniform cross sections, as cross section, 3, A, B, C place in Fig. 2, totally 24 points, get the point that radius is minimum.During two shell rings, then as shown in Figure 3,6 planes are got.By that analogy.

Measure inwall linearity.

The closing end component of equipment and shell ring component, in assembling process, can adopt concentricity and the perpendicularity of same procedure optical measurement closing end component and shell ring component.

Shell ring component or closing end component are in assembling process, for the equipment that required precision is very high, after the appropriate gag of weldering and after finished heat treatment, concentricity and the perpendicularity of an optics repetition measurement equipment can be carried out respectively, require that the repetition measurement data after finished heat treatment meet the technical requirement of equipment.

Use in a kind of pressure vessels for the chemical industry provided by the invention and ensure that the assembly method of Whole Equipment axiality can ensure that the axiality of Whole Equipment meets technical requirement; Meanwhile, should note making the data of measurement during assembling little as far as possible, because circular seam welding is appropriate and after heat treatment, the axiality of equipment may become large, ensure that the repetition measurement data of Whole Equipment can meet technical requirement.

Claims

1. ensure an assembly method for Whole Equipment axiality in pressure vessels for the chemical industry, it is characterized in that: the method is made up of following 4 steps:

Step 1: all shell ring two ends processing UV groove (1) to be assembled;

Step 2: processing datum (2) below the double V-groove of shell ring inwall UV groove (1);

Step 3: using the datum level at shell ring two ends (2) as measuring basis, simulate the axis of each shell ring;

2. ensure the assembly method of Whole Equipment axiality in a kind of pressure vessels for the chemical industry as claimed in claim 1, it is characterized in that: in described step 1, the width (a) of datum level (2) is 5 ~ 10mm.

3. in a kind of pressure vessels for the chemical industry as claimed in claim 1, ensure the assembly method of Whole Equipment axiality, it is characterized in that: the method simulating the axis of shell ring in described step 3 is: evenly get 8 points in the circumference of datum level (2), circumferentially the point apart from one another by three points is connected between two, simulate the center of circle of datum level (2), connect the center of circle of two datum levels (2) at shell ring two ends, be the axis of shell ring.