A detachable intermediate bearing housing for marine main engines and its installation method

Abstract

This invention relates to a detachable intermediate bearing base for marine main engines and its installation method. The base includes an upper and a lower section, connected by bolts. A gasket is installed on the lower section, and several stop blocks are installed on its top surface, enclosing the upper section. This invention avoids the synchronous hoisting of the generator and main shaft; instead, the generator and main shaft move from rear to front. Only one piece of equipment is hoisted at a time, rather than both simultaneously, making precision control easier and significantly reducing installation risks. Furthermore, when the shaft needs to be removed during ship operation, it is unnecessary to hoist the generator and main shaft simultaneously. The upper base can be disassembled, hoisted, and then reinstalled.

Description

Technical Field

[0001] This invention relates to the field of ship design technology, and more particularly to a detachable intermediate bearing housing for marine main engines. Background Technology

[0002] Currently, due to IMO regulations, shipowners and shipyards place great emphasis on energy conservation and emission reduction in ships. Shaft-driven generators, due to their energy-saving effects, are increasingly being installed on ships to achieve energy conservation goals. Current practices include... Figure 1 As shown, after the shaft-driven generator and main shaft are installed, they are hoisted in synchronously. They are not fixed together; each is hoisted using a separate set of lifting equipment. During this process, the relative position of the two cannot exceed the clearance (h) value. Taking a 16K TEU container ship of a certain shipyard as an example, the clearance is only 400mm. The special feature of the shaft-driven generator is that it does not contact the main shaft. The most important part of the shaft-driven generator is the permanent magnet. If a collision occurs during the synchronous hoisting of the main shaft and the shaft-driven generator, the permanent magnet and the outer casing will be firmly attracted, causing permanent damage to the shaft-driven generator, rendering it unusable. Shaft-driven generators are very expensive, so for the shipyard, this represents a huge loss in terms of both material and time costs. Similarly, when the shipowner needs to remove the shaft during ship operation, the generator and main shaft must also be hoisted out synchronously. Since the shipyard is not as familiar with the hoisting process as the shipyard, the risk is even greater. Summary of the Invention

[0003] In response to the aforementioned technical problems, a marine detachable main engine intermediate bearing housing and its installation method are provided.

[0004] The technical means employed in this invention are as follows:

[0005] A marine detachable main engine intermediate bearing base includes an upper base and a lower base, which are connected by bolts. A gasket is provided on the lower base, and several stop blocks are provided on the top surface of the lower base to surround the upper base.

[0006] Furthermore, a lifting lug is provided at the top of the upper half of the base.

[0007] Furthermore, there are two sets of the upper and lower machine bases, and the number of stop blocks is eight. Each set of lower machine bases has four stop blocks, including one at the front, one at the rear, and two on the outside of the lower machine base.

[0008] Furthermore, positioning pin holes are provided at corresponding positions on the upper and lower base halves to ensure the position of the upper base halves after disassembly and repositioning.

[0009] Furthermore, the positioning pin is a pin with a tapered head and a cylindrical body, and it is interference-fitted with the opening of the positioning pin.

[0010] Furthermore, the bottom surface of the upper base and the top surface of the pad are both machined.

[0011] The present invention also discloses an installation method for the above-mentioned detachable marine main engine intermediate bearing housing, comprising the following steps:

[0012] S1. After the upper and lower machine bases are manufactured in the workshop, the contact surfaces of the upper and lower machine bases should be ground well, and the bolt holes and locating pin holes should be drilled. (Note that the locating pin holes of the lower machine base should only be drilled. The reaming should be done after the base is installed in the machine compartment to ensure the accuracy of the locating pins.)

[0013] S2. Connect the upper and lower halves of the base with bolts, tighten the nuts, and then weld the whole assembly to the hull structure. Use a small current as much as possible to reduce the impact of welding on the deformation of the base and reduce the amount of work required in subsequent operations.

[0014] S3. Disassemble the upper half of the base. Since the upper half of the base is not welded, it will not be affected by heat deformation. You only need to grind the shims of the lower half of the base to adjust the level.

[0015] S4. After all adjustments are completed, ream the holes of the positioning pins and insert the positioning pins.

[0016] S5. Install the wedge block for the stop block.

[0017] Compared with existing technologies, this invention has the following advantages: This invention does not employ the method of synchronously hoisting the shaft-driven generator and main shaft; instead, the shaft-driven generator and main shaft move from rear to front. Only one piece of equipment is hoisted at a time, rather than two pieces being hoisted simultaneously, making precision easier to control and significantly reducing installation risks. Furthermore, when the shaft needs to be disassembled during ship operation, it is not necessary to hoist the generator and main shaft out simultaneously; instead, the upper base can be disassembled, hoisted, and then reinstalled. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram illustrating the installation and removal of a shaft-driven generator using existing technology.

[0020] Figure 2 This is a schematic diagram of the installation of the shaft-driven generator according to the present invention.

[0021] Figure 3 This is a schematic diagram of the specific structure of the present invention.

[0022] In the diagram: 1. Upper half of the machine base; 2. Lower half of the machine base; 3. Bolt; 4. Washer; 5. Stop block; 6. Locating pin; 7. Lifting lug. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0027] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0028] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0029] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0030] like Figure 2 As shown, to address the technical problems of existing technologies, this invention does not employ the method of synchronously hoisting the shaft-driven generator and main shaft. Because the main engine is located in front, both the shaft-driven generator and the main shaft need to be moved from rear to front. If the shaft-driven generator is installed first, the main shaft cannot pass through it due to interference from the lifting equipment. Therefore, the only option is to install the main shaft first, and then install the shaft-driven generator through it. The advantage of this method is that only one device is hoisted at a time, rather than two devices being hoisted simultaneously, making precision easier to control and significantly reducing installation risks. However, a problem arises during installation: when the shaft-driven generator passes through the main shaft, it is blocked by the main shaft bearing base and cannot be installed. Conversely, when the shipowner needs to disassemble the shaft during ship operation, the shaft-driven generator is still blocked by the main shaft bearing base and cannot be disassembled.

[0031] Therefore, taking the main shaft bearing base of a 16K TEU container ship from a certain shipyard as an example, such as Figure 3 As shown in the figure, this invention discloses a detachable marine main engine intermediate bearing base, including an upper base 1 and a lower base 2. The upper and lower bases are connected by bolts 3. A gasket 4 is provided on the lower base, and several stop blocks 5 are provided on the top surface of the lower base. These stop blocks enclose the upper base, preventing it from moving in the front-back, left-right, or right-side directions. Specifically, the gasket is welded to the top surface (AA) of the lower base.

[0032] Furthermore, the top of the upper half of the base is provided with a lifting lug 7 to facilitate the disassembly of the upper half of the base.

[0033] Furthermore, there are two sets of the upper and lower machine bases, and the number of stop blocks is eight. Each set of lower machine bases has four stop blocks, including one at the front, one at the rear, and two on the outside of the lower machine base.

[0034] Because the spindle is a rotating body, it rotates rapidly under normal conditions. If the rigidity is insufficient or the precision is not met, resulting in significant deformation, the spindle will vibrate violently and eventually be damaged. Furthermore, locating pin holes are provided at corresponding positions on the upper and lower machine bases. These locating pins (6) ensure the correct position of the upper base after disassembly and repositioning. This solves the problems of high requirements for repositioning, high precision, and high rigidity.

[0035] Furthermore, the positioning pin is a pin with a tapered head and a cylindrical body, and it is interference-fitted with the opening of the positioning pin.

[0036] Furthermore, the bottom surface of the upper base and the top surface of the pad are both machined (shaded area) to ensure contact area for better transmission of vertical loads. Additionally, grinding the pad allows for precise adjustment of the levelness.

[0037] The present invention also discloses an installation method for the above-mentioned detachable marine main engine intermediate bearing housing, comprising the following steps:

[0038] S1. After the upper and lower machine bases are manufactured in the workshop, the contact surfaces of the upper and lower machine bases should be ground well, and the bolt holes and locating pin holes should be drilled. (Note that the locating pin holes of the lower machine base should only be drilled. The reaming should be done after the base is installed in the machine compartment to ensure the accuracy of the locating pins.)

[0039] S2. Connect the upper and lower halves of the base with bolts, tighten the nuts, and then weld the whole assembly to the hull structure. Use a small current as much as possible to reduce the impact of welding on the deformation of the base and reduce the amount of work required in subsequent operations.

[0040] S3. Disassemble the upper half of the base. Since the upper half of the base is not welded, it will not be affected by heat deformation. You only need to grind the shims of the lower half of the base to adjust the level.

[0041] S4. After all adjustments are completed, ream the holes of the positioning pins and insert the positioning pins.

[0042] S5. Install the wedge block for the stop block.

[0043] Furthermore, for bolted, split-type bases, it's necessary to calculate whether they can meet the strength and stiffness requirements of an integrated base. Stiffness requirements and natural frequencies can be calculated using the finite element method within a unit area. Note that the gasket portion needs to be modeled using a solid model, while other parts can be modeled using a shell model. Calculations show that, with a sufficient number of bolts, bolted, split-type bases closely approximate integrated bases in terms of strength, stiffness, and vibration characteristics, thus meeting the usage requirements.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for installing a detachable intermediate bearing housing for marine main engines, characterized in that, The detachable main engine intermediate bearing pedestal for ship includes an upper half pedestal and a lower half pedestal, the upper half pedestal and the lower half pedestal are connected by bolts, a gasket is arranged on the lower half pedestal, and a plurality of stop blocks are arranged on the top surface of the lower half pedestal, the upper half pedestal is surrounded by the stop blocks; The upper half pedestal and the lower half pedestal are both two sets, the number of the stop blocks is eight, four stop blocks are arranged on each lower half pedestal, and the four stop blocks include one stop block arranged in front of the lower half pedestal, one stop block arranged at the rear of the lower half pedestal, and two stop blocks arranged outside the lower half pedestal; The specific installation method includes the following steps: S1, after the upper half pedestal and the lower half pedestal are manufactured, the contact surfaces of the upper half pedestal and the lower half pedestal are polished, bolt holes and positioning pin holes are drilled, only the positioning pin holes of the lower half pedestal are drilled, and the reaming operation is performed after the base in the cabin is installed, so that the accuracy of the positioning pin is ensured; S2, the upper half pedestal and the lower half pedestal are connected by bolts, the nuts are fastened, and then the upper half pedestal and the lower half pedestal are integrally welded to the ship structure; S3, the upper half pedestal is disassembled, the upper half pedestal is not welded, no thermal influence deformation occurs, and the levelness is adjusted by polishing the gasket of the lower half pedestal; S4, after all the adjustments are completed, the positioning pin holes are reamed, and the positioning pins are inserted; S5, the wedge blocks of the stop blocks are installed. The method does not use the synchronous lifting mode of the shaft generator and the main shaft, the shaft generator and the main shaft are moved from the rear to the front, and only one device is lifted at a time.

2. The mounting method according to claim 1, characterized in that, The top end of the upper half pedestal is provided with an ear.

3. The mounting method of claim 1, wherein Positioning pin holes are arranged at the corresponding positions of the upper half pedestal and the lower half pedestal, the position of the upper half pedestal after disassembly and reset is ensured by arranging the positioning pins.

4. The mounting method of claim 1, wherein The positioning pin is a pin with a tapered head and a cylindrical body, and the positioning pin hole is an interference fit.

5. The method of installing of claim 1, wherein, The bottom surface of the upper half pedestal and the top surface of the gasket are machined.

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