CN104760663A

CN104760663A - Shipping shaft system alignment method

Info

Publication number: CN104760663A
Application number: CN201510033746.7A
Authority: CN
Inventors: 冯树才; 程斌
Original assignee: 708th Research Institute of CSIC
Current assignee: 708th Research Institute of CSIC
Priority date: 2015-01-22
Filing date: 2015-01-22
Publication date: 2015-07-08

Abstract

The invention discloses a shipping shaft system alignment method which is suitable for old ship transformation, and belongs to the technical field of shipping. The shipping shaft system alignment method comprises the steps that a tail tube rear bearing is simplified to be single point bearing, and the supporting point position S of the single point bearing is equal to 1/2L, wherein the S is the distance from the supporting point of the tail tube rear bearing to the rear end face of the tail tube rear bearing, and the L is the length of the tail tube rear bearing; and a bearing load method is used for alignment. According to the technical scheme, the bearing load method is used for alignment, the single supporting point position of the tail tube rear bearing is reasonably selected, and therefore theoretical calculation and ship data can be better matched.

Description

A kind of method in Shafting Alignment of Vessels

Technical field

The invention belongs to ocean engineering technical field of mechanical equipment, relate to a kind of alignment calculation method, particularly relate to a kind of method be applicable in the reservation primitive axis system of obsolete vessel transformation and the Shafting Alignment of Vessels of bearing.

Background technology

The shafting alignment calculating of obsolete vessel transformation calculates with the shafting alignment of new shipbuilding oceangoing ship and is very different.For new shipbuilding oceangoing ship, alignment calculation can according to just calculating result, and adjustment axle system all parts, even redesigns axle system.But when some obsolete vessels are transformed, axle system and bearing are that former ship retains, can only be installed by adjustment middle bearing and main frame and meet requirement in school.In a general case, if former ship axle system operational excellence in actual use, do not occur problem, and changed axle system and bearing and add cost, therefore, retaining former ship axle system and bearing is not only fast but also failure-free way.And retain former ship axle system and bearing just needs shaft to carry out alignment calculation.

In the shafting alignment of prior art calculates, tail pipe rear bearing is reduced to single-point support usually, the position of bearing pivot is (as shown in Figure 1): a=(1/7 ~ 1/3) L, in formula: a is the distance of tail pipe rear bearing pivot distance bearing aft end face; L is tail pipe rear bearing length.

Japan, Korea S waited when carrying out alignment calculation, and tail pipe rear bearing is also reduced to single-point support usually, and bearing pivot position b is (as shown in Figure 2): static: D/3; Dynamic: L/3, in formula: D is prop shaft diameter; L is tail pipe rear bearing length.

These two kinds simplify calculating and obtain good checking in the utilizations of new shipbuilding oceangoing ship, but and the alignment calculation be not exclusively suitable in obsolete vessel transformation.

Summary of the invention

In view of this, the invention provides a kind of method in Shafting Alignment of Vessels.

For achieving the above object, concrete technical scheme is as follows:

A method in Shafting Alignment of Vessels, be applicable in obsolete vessel transformation, described axle system comprises tail pipe rear bearing, said method comprising the steps of:

Step 1, is reduced to single-point support by described tail pipe rear bearing, the position of the fulcrum S=1/2L of described single-point support, and wherein, S is the distance of tail pipe rear bearing pivot distance bearing aft end face, and L is the length of tail pipe rear bearing,

Step 2, is undertaken in school by bearing load method.

Preferably, the gross tonnage of described boats and ships is below 100,000 tons.

Preferably, described axle system also comprises middle bearing and thrust baring, and described tail pipe rear bearing, middle bearing are connected successively with thrust baring.

Preferably, described middle bearing comprises front middle bearing and rear intermediate shaft holds.

Preferably, described thrust baring comprises forward thrust bearing and back pressure bearing.

Preferably, described tail pipe rear bearing, rear intermediate shaft hold, front middle bearing, back pressure bearing be connected successively with forward thrust bearing.

Relative to prior art, technical scheme of the present invention is specially adapted to obsolete vessel transformation, takes in bearing load method school, Rational choice tail pipe rear bearing list position of the fulcrum, theory calculate and real ship data can be made to coincide better.

Accompanying drawing explanation

The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is the position of the fulcrum schematic diagram of prior art;

Fig. 2 is the position of the fulcrum schematic diagram of another prior art;

Fig. 3 is the position of the fulcrum schematic diagram of embodiments of the invention.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.

Below with reference to accompanying drawing, concrete explaination is done to embodiments of the invention.

The boats and ships that embodiments of the invention choose one about 20,000 tons carry out alignment calculation, and load is lifted in table 1 in its transformation sinciput each bearing top of lifting in test:

Table 1

	Rear intermediate shaft holds	Front middle bearing	Back pressure bearing	Forward thrust bearing
					Load (kN) is lifted on bearing top	439	343	24	50

Meanwhile, its each bearing load allowable is in table 2:

Table 2

Suppose that tail pipe rear bearing position of the fulcrum is chosen at L/3 place and carries out alignment calculation, each bearing calculated load is in table 3:

Table 3

Comparison sheet 2,3 can be found out, although calculated load is all in the scope that each bearing allows, rear intermediate shaft holds load under heat run state close to allowable value, and under main frame at full capacity operating mode, it is more dangerous that rear intermediate shaft holds; The calculated load of calm state and real ship item are lifted and are measured load and also there is larger difference in addition, exceed 42kN (481-439=42kN); Meanwhile, the load of tail pipe rear bearing is but much smaller than its load allowable.

As shown in Figure 3, in an embodiment of the present invention, select the position of the fulcrum of tail pipe rear bearing at L/2 place, each bearing calculated load is in table 4:

Table 4

Comparison sheet 1,4, after re-starting alignment calculation, makes the result of new alignment calculation more close to axle system truth.Rear intermediate shaft holds the allowance that there has also been 7%, and for the boats and ships of former ship axle system operational excellence, this can accept.

Shipyard carries out axle system according to technique in new alignment calculation and school and main frame is installed, and adjust the pad of middle bearing and reorientate new main frame setting height(from bottom), reasonable distribution bearing load, repeats no more here.

Thereafter, carried out hot static bearing load in the trial voyage or flight test after recovery land maintenance and renovation engineering terminates and measured, the results are shown in Table 5:

Table 5

	Rear intermediate shaft holds	Front middle bearing	Back pressure bearing	Forward thrust bearing
					Hot static load (kN)	440	335	40	29

Comparison sheet 4,5 can be found out, real ship fever static test load and calculated load are coincide, and whole axle system runs well, and illustrates that the transformation of whole Propulsion Systems achieves success, demonstrates the correctness that tail pipe rear bearing position of the fulcrum is chosen.

Be described in detail specific embodiments of the invention above, but it is just as example, the present invention is not restricted to specific embodiment described above.To those skilled in the art, any equivalent modifications that the present invention is carried out and substituting also all among category of the present invention.Therefore, essence of the present invention is not being departed from

God and scope under do equalization conversion and revise, all should contain within the scope of the invention.

Claims

1. the method in Shafting Alignment of Vessels, be applicable in obsolete vessel transformation, described axle system comprises tail pipe rear bearing, it is characterized in that, said method comprising the steps of:

Step 2, is undertaken in school by bearing load method.

2. the method in Shafting Alignment of Vessels as claimed in claim 1, it is characterized in that, the gross tonnage of described boats and ships is below 100,000 tons.

3. the method in Shafting Alignment of Vessels as claimed in claim 2, it is characterized in that, described axle system also comprises middle bearing and thrust baring, and described tail pipe rear bearing, middle bearing are connected successively with thrust baring.

4. the method in Shafting Alignment of Vessels as claimed in claim 3, it is characterized in that, described middle bearing comprises front middle bearing and rear intermediate shaft holds.

5. the method in Shafting Alignment of Vessels as claimed in claim 4, it is characterized in that, described thrust baring comprises forward thrust bearing and back pressure bearing.

6. the method in Shafting Alignment of Vessels as claimed in claim 5, is characterized in that, described tail pipe rear bearing, rear intermediate shaft hold, front middle bearing, back pressure bearing are connected successively with forward thrust bearing.