CN214444319U

CN214444319U - Large-scale marine diesel engine cylinder cooling water jacket demolishs subassembly

Info

Publication number: CN214444319U
Application number: CN202022852019.2U
Authority: CN
Inventors: 姚希
Original assignee: China Shipbuilding Marine Power Technology Service Co ltd
Current assignee: China Shipbuilding Marine Power Technology Service Co ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-10-22
Anticipated expiration: 2030-11-30

Abstract

The utility model discloses a large-scale marine diesel engine cylinder cooling jacket demolishs subassembly, demolishs the subassembly and includes stereoplasm rubber tube and stopper, demolishs the method and includes that the cylinder cap hoists in advance, condenser tube changes the stereoplasm rubber tube, places the stopper, transfers the cylinder cap, moves and hangs the cylinder cap and hoist and mount the water jacket, the utility model has the characteristics of the atress is even, convenient operation, swift, safety. Because the cylinder head pushes down, the fixing bolt of the cylinder head can play a role in guiding, so that the cylinder head can be kept horizontal when pushed down, the hard rubber pipe is uniformly stressed, and the construction safety is ensured. And simultaneously, because the utility model discloses need not to increase more instrument frock and operating procedure, so it is also more convenient that the operation is got up. To large-scale marine diesel engine, because of its cylinder head dead weight is great, so use the utility model discloses demolish cooling jacket and also more swiftly high-efficient than methods such as hammering and calabash drop-down.

Description

Large-scale marine diesel engine cylinder cooling water jacket demolishs subassembly

Technical Field

The utility model belongs to the technical field of the engine, concretely relates to large-scale marine diesel engine cylinder cooling jacket demolishs subassembly.

Background

The cylinder cooling water jacket of the marine diesel engine is of a cylinder structure made of cast iron, is fixed on the outer wall of a cylinder sleeve and forms a closed cooling water cavity together with the cylinder sleeve, and a sealing ring made of rubber is arranged between the cooling water jacket and the cylinder sleeve to ensure the sealing effect. For cooling water jackets, the clean water chamber should be periodically (e.g., with an opportunity for every 5 years of dock overhaul) debugged and the seal ring replaced. In the diesel engine maintenance specification, the cooling water jacket can be put down by using the self weight of the cooling water jacket after the fixing device of the cooling water jacket and the cylinder sleeve is removed; however, in actual operation, due to corrosion of the water jacket, aging of the sealing ring and the like, the cooling water jacket and the cylinder sleeve are bonded, and the cooling water jacket and the cylinder sleeve can be separated and removed only by using external force.

At present, when the cooling water jacket and the cylinder sleeve are bonded, the cooling water jacket is separated and removed by adopting a hammering or chain block downward pulling method. In the method for pulling the chain block downwards, 2 or 4 chain blocks (SWL is 1T or 2T) are arranged diagonally during specific operation, and two ends of each block are respectively fixed on a lifting point of a cold water jacket and a scavenging port of a cylinder sleeve; and then simultaneously tightening the chain and continuing to tighten until the cooling water jacket is separated from the cylinder sleeve. However, in the actual operation process, 2 or 4 people tightening the chains cannot exert force completely synchronously, and the strength of each person is different, so that the chains are stressed unevenly, and the chain is time-consuming and labor-consuming to dismantle; even more, a chain breakage accident may occur, resulting in a safety risk.

SUMMERY OF THE UTILITY MODEL

The utility model aims to develop a convenient, swift, safe method according to marine diesel engine cooling water jacket's structural feature, come to separate cooling water jacket and demolish, in order to reach above-mentioned purpose, provide a large-scale marine diesel engine cylinder cooling water jacket demolishs method.

The design principle is as follows: and pressing the cooling water jacket downwards by using the weight of the cylinder cover, so that the cooling water jacket is separated from the cylinder sleeve and detached.

The purpose of the utility model is realized by adopting the following technical scheme:

the dismounting assembly for the cylinder cooling water jacket of the large marine diesel engine comprises hard rubber pipes and limiting blocks, wherein the number of the hard rubber pipes is the same as that of the cylinder cooling water pipes, the outer diameter of each hard rubber pipe is smaller than the diameter of each cooling water pipe, and the length of each hard rubber pipe is larger than that of each cooling water pipe; the limiting block is matched with the bottom of the cooling water jacket, and the top surface of the limiting block is lower than the bottom surface of the protruding part of the cooling water jacket.

Preferably, the four hard rubber tubes have an outer diameter of 52mm and a length of 300 mm.

Preferably, the four limiting blocks are limiting wood blocks, and the distance between the top surfaces of the limiting wood blocks and the bottom surface of the protruding portion of the cooling water jacket is 30-40 mm.

A method for dismantling a cooling water jacket of a large marine diesel engine cylinder comprises the following steps:

firstly, pre-hoisting a cylinder cover, loosening and removing a nut on the upper part of a stud of the cylinder cover, and hoisting the cylinder cover by using a hoisting screw at the top of the cylinder cover for a pre-hoisting distance, wherein the pre-hoisting distance is not more than the top end of the stud of the cylinder cover.

And secondly, replacing the pipes, namely taking down the cooling water pipes, replacing the cooling water pipes with the same number of hard rubber pipes, and respectively inserting two ends of each hard rubber pipe into the cylinder cover and the cooling water pipe seats on the cold water jacket.

And placing a limiting block, arranging 4 leveling limiting wood blocks with proper height around the lower part of the cooling water jacket, placing the bottom of the leveling limiting wood blocks on the upper plane of the rack, and placing the top of the leveling limiting wood blocks 30-40 mm away from the lower plane of the protruding part of the cooling water jacket.

And fourthly, slowly lowering the cylinder cover, and gradually applying force to press the cooling water jacket through the hard rubber pipe by utilizing the gravity of the cylinder cover until the cooling water jacket is separated from the cylinder sleeve.

And fifthly, moving the cylinder cover, lifting the cylinder cover away, and removing the hard rubber tube.

Sixthly, hoisting the water jacket, hoisting the cooling water jacket by using hoisting equipment, removing the wood block below the water jacket, and slowly lowering the cooling water jacket to the upper plane of the rack.

Compared with the prior art, the beneficial effects of the utility model reside in that: the utility model has the characteristics of the atress is even, convenient operation, swift, safety. Because the cylinder head down presses, the fixing bolt of cylinder head can play the guide effect, consequently can keep the level when the cylinder head pushes down, and then guarantees that 4 hard rubber tube atress are even, has ensured construction safety. And simultaneously, because the utility model discloses need not to increase more instrument frock and operating procedure, so it is also more convenient that the operation is got up. In addition, for large-scale marine diesel engine, because its cylinder head dead weight is great (for example, the cylinder head assembly weight of RT-flex84T-D is about 7.5 tons), so use the utility model discloses demolish cooling jacket also more swift high-efficient than methods such as hammering and calabash drop-down.

Drawings

FIG. 1 is a schematic view of a cylinder head lift;

fig. 2 is a method for separating and removing the cooling water jacket by pressing down the cylinder head.

In the figure:

1. a hard rubber tube; 2. a limiting block;

100. a cylinder head;

200. a cooling water pipe base;

300. a cylinder head stud;

400. a spreader;

500. a frame;

600. a cooling water jacket;

700. a cylinder liner.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

A large marine diesel engine cylinder cooling water jacket dismantling assembly comprises hard rubber pipes 1 and limiting blocks 2, wherein the number of the hard rubber pipes 1 is the same as that of cylinder cooling water pipes, the outer diameter of each hard rubber pipe 1 is smaller than the diameter of each cooling water pipe, and the length of each hard rubber pipe 1 is larger than that of each cooling water pipe; the limiting block 2 is matched with the bottom of the cooling water jacket 600, and the height of the limiting block 2 is set to be lower than the bottom surface of the protruding part of the cooling water jacket.

Further, the outer diameter of each of the four hard rubber tubes 1 is 52mm, and the length thereof is 300 mm.

Furthermore, the four limiting blocks 2 are limiting wood blocks, and the distance between the top surfaces of the limiting wood blocks and the bottom surface of the protruding part of the cooling water jacket is 30-40 mm.

The method for removing the large marine diesel engine cylinder cooling water jacket 600 by adopting the removing assembly comprises the following steps.

Firstly, pre-hoisting a cylinder cover, referring to fig. 1, after a nut on the upper part of a stud 300 of the cylinder cover is unscrewed and removed, a hoisting tool 400 and a hoisting screw at the top of the cylinder cover are used for hoisting the cylinder cover 100 for a pre-hoisting distance, wherein the pre-hoisting distance is not more than the top end of the stud 300 of the cylinder cover. The distance is about 100mm (see fig. 1), but care is taken not to lift the cylinder head 100 too high beyond the cylinder head stud 300.

And secondly, replacing pipes, namely taking down the cooling water pipes, replacing the cooling water pipes with the same number of hard rubber pipes 1, and respectively inserting two ends of each hard rubber pipe 1 into the cylinder cover 100 and the cooling water pipe seats 200 on the cold water jacket 600.

Wherein, the parameters of the cooling water pipe are that 4 external diameters are 53mm, the length is 260 mm. The parameters of the hard rubber tubes are 4 tubes with the outer diameter of 52mm and the length of 300 mm.

And thirdly, placing a limiting block 2, arranging 4 leveling limiting wood blocks with proper height around the lower part of the cooling water jacket 600, placing the bottom of the leveling limiting wood blocks on the upper plane of the rack 500, and enabling the top of the leveling limiting wood blocks to be 30-40 mm away from the lower plane of the protruding part of the cooling water jacket.

And fourthly, slowly lowering the cylinder cover 100, and gradually applying force to press down the cooling water jacket 600 through the hard rubber pipe 1 by utilizing the gravity of the cylinder cover until the cylinder cover is separated from the cylinder sleeve 700.

And fifthly, moving the cylinder cover, lifting the cylinder cover 100 away, and removing the hard rubber tube 1.

Sixthly, hoisting the water jacket, hoisting the cooling water jacket 600 by using hoisting equipment, removing the limiting block 2 below the water jacket, and slowly lowering the cooling water jacket 600 to the upper plane of the rack.

The utility model discloses need not to increase more instrument frock and operating procedure, so it is also more convenient to operate. For large-scale marine diesel engine, because its cylinder head dead weight is great (for example RT-flex 84T-D's cylinder head assembly weight is about 7.5 tons), use the utility model discloses demolish cooling jacket and also more swiftly high-efficient than methods such as hammering and calabash drop-down.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. The utility model provides a subassembly is demolishd to large-scale marine diesel engine cylinder cooling water jacket which characterized in that: the dismounting assembly comprises hard rubber pipes and limiting blocks, the number of the hard rubber pipes is the same as that of the cooling water pipes of the air cylinder, the outer diameter of each hard rubber pipe is smaller than the diameter of each cooling water pipe, and the length of each hard rubber pipe is larger than that of each cooling water pipe; the limiting block is matched with the bottom of the cooling water jacket, and the top surface of the limiting block is lower than the bottom surface of the protruding part of the cooling water jacket.

2. The demolition assembly of claim 1 wherein: the outer diameter of each of the four hard rubber tubes is 52mm, and the length of each of the four hard rubber tubes is 300 mm.

3. The demolition assembly of claim 1 wherein: and the four limiting blocks adopt limiting wood blocks, and the distance between the top surfaces of the limiting wood blocks and the bottom surfaces of the protruding parts of the cooling water jackets is 30-40 mm.