JPS6128457B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for inserting tube bundles into the shell of a heat exchanger.

As will be described later, the conventional method for inserting a tube bundle into a heat exchanger is to insert it in a horizontal position using a crane. However, this method has problems such as the work is complicated and takes a long time, the inner surface of the body plate and the buttful plate are damaged, and the tubes cannot be inserted into the tube plate at the same time.

By using an L-shaped undulating bed, the tube bundle assembled in a horizontal position elsewhere is raised vertically using this undulating bed, and a body plate is attached to the tube bundle in the vertical position from above. This device solves all of the problems of the conventional tube bundle insertion device, and can be used in the assembly of large heat exchangers to provide an extremely effective tube bundle insertion device.

The prior art will be described below with reference to FIGS. 1 and 2, and then embodiments of the present invention will be described.

Regarding the conventional method: A body plate 2 with a tube plate 1 fixed to one end thereof is placed on an assembly stand pedestal 6 and fixed to a work place with a wire rope 7.

A tube bundle 4 (Fig. 1) assembled with the tube plate 1 attached to one end at another location is lifted by cranes a and b (Fig. 1) via the lifting device 8 and the hanging piece attached to the tube plate 1. Bring it to the open end side of the body plate 2.

The body plate 2 and the tube bundle 4 are aligned, and the tube band 4 is inserted by crane operation. At this time, the front side of the tube bundle 4 remains suspended by the crane a, but the tube sheet 1 is placed on a trolley 10 placed on a rail laid in the work area (FIG. 2).

Once the front part of the tube bundle is inserted,
Remove the tube bundle hanging tool 8, and then remove the hanging tool 8.
The rear side of the tube bundle is suspended from the middle, and the wire rope d of the retraction winch c is stretched between the tube plate on the tube bundle 4 side and the tube plate on the body plate side, and the tube bundle is lifted by this winch. Continue inserting 4.

The above is the conventional insertion method, but this method requires cumbersome work. In particular, since push-insertion using a crane and retraction-insertion using a winch are used in combination, it takes a long time to change the setup.

(b) Insertion frictional resistance often causes damage to the buttful plate and the inner surface of the body plate.

C. Because the body plate and tube bundle have an insertion relationship, they cannot be made to have the same size; the inside diameter of the body plate is greater than the outside diameter of the tube bundle, and for large ones, the difference is several mm. For this reason, the tube bundle 4 inserted in a horizontal position contacts the bottom surface within the body plate, but leaves a gap on the top surface. Therefore, the cores of the tube holes in the tube plate on the body plate side and the tubes of the tube bundle do not match, making it impossible to insert the tubes simultaneously and integrally. For this reason, in order to pass the tubes through, each tube had to be guided and inserted into the tube plate one by one.

The present invention has been devised to remedy the drawbacks of the known methods mentioned above, and FIGS. 3-4 show apparatus for carrying out the invention. That is, 11 is tube bundle 4
The station 12 for standing upright is an L-shaped elevating table, and the corner part of the L-shape is pivotally supported 15 on the base of the station 11. Reference numeral 13 is a tube holding plate which prevents the tube from coming off. Reference numeral 14 denotes a tube bundle holder, which is fixed to the undulating table 12 with bolts 16 as shown in FIG.
4a allows the interval to be adjusted. Reference numeral 17 denotes a winding rope hooking section 18 which is an auxiliary winding rope hooking section and is used when raising the tube bundle 4.

Now, the insertion of the tube bundle 4 will be explained with reference to FIGS. 5a to 5e.

Jig set (Fig. 5a) Elevating table 12 of station 11 shown in Fig. 3
Then, set the pedestal 14 and tube presser 13.

Lifting and setting of tube bundle (5th
Figure b) The tube bundle 4 is suspended by a crane and placed on the bundle holder 14. At this time, the bundle 4 being lifted is placed on the tube plate receiving ring 19.
(Fig. 6) and lower it onto the pedestal 14.
Next, the suspension of the tube bundle 4 is removed, and a tube guide 20 as shown in FIG. 7 is attached to the tip of the tube on the other end of the bundle. To ensure alignment with the holes in the tubesheet, it is recommended to paint several dozen easy-to-see locations on the tube guide 20 and the tubesheet with colored marker.

Raising the tube bundle (Fig. 5c) Raise the hoisting table 12 by balancing the main winding rope 17a and the auxiliary winding rope 18a. Once it is vertical, make sure that it is in close contact with the base of the station 11, and use the station to tighten and fix the bundle side base.

On the other hand, the body plate 2 to which the tube plate 1 is fixed at one end is brought onto the upright tube bundle 4, and is inserted from the top of the tube bundle while adjusting the verticality of the body plate.

Inserting the tube bundle Loosen the bolts on the bundle cradle 14 to widen the gap between the cradle (Fig. 8), shift it until the body plate fits, and fix it. Lower the body plate. The next bundle holder 14 is shifted and fixed, and the body plate is lowered to the bottom in the same order.

Insert the tube into the tube plate on the body side When the tip of the tube bundle reaches just before the tube plate on the body side, the descent of the body plate is temporarily stopped. After checking from the outside of the tube plate on the shell plate side that all the tube guides 20 attached to the tubes attached to the tubes described above are inserted into the tube holes (Fig. 9), lower the shell plate to the lowest level. At this stage, the body plate and the tube bundle side plate (located on the lower side when oriented vertically) are tack welded and fixed.

Lowering the shell (Fig. 5e) After completing the work in the upright position, secure the cradle to the outer circumferential surface of the shell plate with bolts. Remove all bolts at the joint between the station and bundle base. Then, fall down in the reverse order of standing up. Carrying out the main body of the main body.

In the above manner, the insertion of the tube bundle into the body plate is completed. As described above, according to the present invention, when inserting a body plate into an upright tube bundle, the vertically suspended body plate is held approximately concentrically with the tube bundle using a bundle holder arranged between the tube bundle and the undulating table. Since the tube bundle is guided to descend, the body plate does not get caught on the buttful plates constituting the tube bundle, and the body plate can be smoothly inserted into the upright tube bundle.

Furthermore, since all of the upright tube bundles are equipped with conical tube guides, even if the tube bundle is subjected to bending deformation during transportation, it is possible to center the body plate with respect to the upright tube bundle. A large number of tube bundles can all be smoothly and integrally inserted into holes formed in the tube plate of the body plate. In this way, the tube bundle insertion time can be significantly shortened compared to the conventional method.

The time required to insert the tube into the tube sheet is reduced.

Product quality can be improved without damaging the tube bundle or body plate.

There is no need for a large work pit like in the past.

It has the following advantages, and is particularly effective in assembling large heat exchangers.

[Brief explanation of the drawing]

1 and 2 are views showing a known bundle insertion method, FIG. 3 is a front view of a station for a bundle insertion device according to the present invention, FIG. 4 is an enlarged view of a tube bundle holder, and FIG. 5 Figure 6 is an explanatory diagram of the tube bundle insertion method, Figure 6 is an enlarged sectional view of the tube plate receiving ring, Figure 7 is a detailed view of the tube guide, and Figure 8 is the method for expanding the tube bundle holder when the body plate is lowered. shows. FIG. 9 is a side sectional view just before inserting the tube into the tube plate on the body plate side. In the figure; 1...tube plate, 2...body plate, 3...
Tube, 4...Tube bundle, 5...Bassful plate, 6...Scraper, 7...Fixed wire rope, 8...Tube bundle hanging tool, 9...Jet, 10...Dolly, 11...Station ,
12...Luffing table, 13...Tube presser, 14
...Tube bundle holder, 14a...long hole,
15... Pivotal branch, 16... Bolt, 17, 18...
...Hook part (for hanging wire), 19...Receiving ring, 20...Tube guide.

Claims (1)

[Claims] 1 Consists of an upright station 11 having a base portion and an L-shaped undulating table 12 consisting of a short side and a long side,
The L-shaped elevating table 12 has an L-shaped corner portion pivoted 15 to the end of the base portion of the station 11 so as to be rotatable by 90 degrees.
A tube holding plate 13 and a tube plate receiving ring 19 concentric with the tube holding plate 13 are provided on the short side of the undulating table 12, and an auxiliary rope hooking portion 18 is provided at the tip, and the same is provided on the long side. The interval can be adjusted to create a gap for inserting the body plate when inserting the body plate.
Bundle fixing band 1 for fixing tube bundles
It has a plurality of pairs of tube bundle holders 14 on which the cables 4b can be hooked, and a main winding rope hook 1 is provided at the end.
7, and a tube guide 20 that can be inserted and removed at the tip of each tube of the tube bundle.