Lifting method for complete low-speed marine diesel engine and cylinder end lifting tooling

Abstract

A lifting method and cylinder end lifting tool for a complete low-speed marine diesel engine, the cylinder end lifting tool comprising a bottom plate, a side plate, two main lifting plates and four lifting nuts; the bottom plate is arranged horizontally, and a through hole for passing the cylinder head stud is provided on the plate surface, and the position of the through hole corresponds to the position of the mounting hole on the cylinder head, the two main lifting plates are vertically welded to both sides of the upper plane of the bottom plate, the main lifting plate is provided with a lifting hole for passing a sling or a shackle, the side plate is vertically welded between the two main lifting plates and welded and fixed to the bottom plate; the cylinder head stud passes through the mounting hole of the cylinder head and the through hole of the bottom plate, and the cylinder end lifting tool is fixed to the upper plane of the cylinder head through the lifting nut. The present invention solves the problem that the original cylinder lifting tool cannot meet the demand when lifting the complete low-speed marine diesel engine, and achieves the effect of reducing costs and shortening cycles while ensuring the safety of the lifting operation.

Description

Technical Field

[0001] The invention relates to a lifting auxiliary device, in particular to a lifting method for a complete low-speed marine diesel engine and a cylinder end face lifting tool, belonging to the technical field of diesel engine manufacturing. Background Art

[0002] The three major parts of a marine low-speed diesel engine usually refer to the cylinder block, engine base and engine frame. As one of the three major parts of a marine low-speed diesel engine, the cylinder block itself is relatively large in size and weight, so the cylinder block needs to be lifted with a special cylinder block lifting tool during the transfer process. Figure 4 , a cylinder head b is installed on the cylinder block of a marine low-speed diesel engine, and a cylinder lifting fixture a is installed on the upper plane of the cylinder head b. When the cylinder block is transported alone, only eight cylinder lifting fixtures a need to be installed on the cylinder head b to complete the lifting operation. However, in special cases, the entire machine needs to be transported, that is, the three parts of the engine base, frame and cylinder block are assembled and then hoisted as a whole. Since the weight of the entire machine is much greater than the single weight of the cylinder block, if only eight cylinder lifting fixtures a are used at this time, the lifting load will exceed the rated load of the fixture, making it difficult to complete the lifting of the entire marine low-speed diesel engine. Although the eight cylinder lifting fixtures a can be remade to increase the rated lifting load of a single cylinder lifting fixture a, it will increase costs and extend the cycle, and the load at each lifting point will also increase significantly, and the lifting safety will face great challenges. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that the existing cylinder lifting tooling cannot meet the lifting operation requirements of a complete marine low-speed diesel engine, and to provide a lifting method and a cylinder end face lifting tooling for a complete marine low-speed diesel engine to assist the existing cylinder lifting tooling to jointly complete the whole machine transshipment and lifting operation, thereby achieving the effect of reducing costs and shortening cycles while ensuring the safety of the lifting operation.

[0004] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0005] A cylinder end lifting fixture for a complete marine low-speed diesel engine, wherein the cylinder head of the marine low-speed diesel engine is provided with a mounting hole and is installed on the cylinder body through cylinder head studs, and is characterized in that the cylinder end face lifting fixture comprises a bottom plate, a side plate, two main lifting plates and four lifting nuts; the bottom plate is horizontally arranged, and four through holes are provided on the plate surface for passing the cylinder head studs, and the positions of the through holes correspond to the positions of the mounting holes on the cylinder head; the two main lifting plates are vertically welded to both sides of the upper plane of the bottom plate, and the main lifting plates are provided with lifting holes for passing a sling or a shackle, and the side plate is vertically welded between the two main lifting plates and is welded and fixed to the bottom plate at the same time; the cylinder head studs pass through the mounting holes of the cylinder head and the through holes of the bottom plate, and the cylinder end face lifting fixture is fixed to the upper plane of the cylinder head through the lifting nuts.

[0006] As a further improvement, the cylinder end lifting tool further includes a rib plate, which is located at the center of the side plate and fixedly welded between the side plate and the bottom plate.

[0007] As a further improvement, the center of the through hole and the center of the mounting hole of the cylinder head are distributed on an arc of the same radius, and the aperture of the through hole is the same as the aperture of the mounting hole.

[0008] As a further improvement, the bottom plate has an outer shape that is concave in the middle to avoid interference with the valve member installed on the cylinder head.

[0009] As a further improvement, the two main hanging plates are parallel to each other.

[0010] Another technical solution of the present invention is as follows:

[0011] A method for lifting a complete low-speed marine diesel engine using the cylinder end lifting tool is described below:

[0012] 1) Install eight cylinder lifting fixtures on the upper planes on both sides of the cylinder head respectively;

[0013] 2) First remove the four cylinder head nuts on the outer side of the cylinder head at the front end of the cylinder block, then place the bottom plate on the upper plane of the cylinder head so that the four through holes correspond to the positions of the mounting holes on the cylinder head, the cylinder head studs pass through the mounting holes and through holes, and the lifting nuts are screwed into the upper ends of the cylinder head studs, thereby fixing the bottom plate on the cylinder head, and completing the installation of a cylinder end lifting tool;

[0014] 3) Using the same method as step 2), install another cylinder end lifting tool on the cylinder head at the rear end of the cylinder;

[0015] 4) Insert lifting belts or shackles into the lifting holes of the eight cylinder lifting fixtures and the two cylinder end lifting fixtures respectively, and cooperate with the lifting beam and the crane to complete the lifting operation of the marine low-speed diesel engine.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0017] 1. Since cylinder end lifting fixtures are added at both ends of the cylinder body, four lifting points are added, which can be used in conjunction with the original cylinder lifting fixtures to complete the whole machine transshipment and lifting operations; at the same time, the setting of multiple lifting points correspondingly reduces the lifting load of each lifting point, thereby ensuring the safety of lifting.

[0018] 2. The present invention avoids the cost increase and cycle extension caused by remaking eight cylinder lifting fixtures, thereby reducing the process cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 yes Figure 1 Left view of .

[0021] Figure 3 yes Figure 1 Top view of the .

[0022] Figure 4 It is a usage state diagram of the present invention.

[0023] Figure 5 It is an installation schematic diagram of the present invention.

[0024] In the figure,

[0025] a—cylinder lifting fixture, b—cylinder head, c—cylinder head studs, 1—cylinder end lifting fixture, 2—through hole, 3—bottom plate, 4—side plate, 5—rib plate, 6—main lifting plate, 7—lifting hole, 8—lifting nut. DETAILED DESCRIPTION

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, but the scope of protection of the present invention shall not be limited thereby.

[0027] The present invention is used for the lifting operation of a complete low-speed marine diesel engine. Figure 4 The cylinder head b of the marine low-speed diesel engine is installed on the cylinder body through the cylinder head studs c.

[0028] Please refer to Figure 1 , Figure 2 and Figure 3The cylinder end lifting fixture shown in the figure includes a bottom plate 3, a side plate 4, a rib plate 5, two main lifting plates 6 and four lifting nuts 8.

[0029] The two main suspension plates 6 are vertically welded to the two sides of the upper plane of the bottom plate 3 and are parallel to each other. The main suspension plates 6 are provided with lifting holes 7 for passing a sling or a shackle.

[0030] The side plate 4 is vertically welded between the two main hanging plates 6 and is also welded and fixed to the bottom plate 3 .

[0031] The rib plate 5 is fixedly welded between the side plate 4 and the bottom plate 3 and is located at the center of the side plate 4 .

[0032] The bottom plate 3 has a concave shape in the middle, which can avoid interference with the valve components installed on the cylinder head b during installation. Four through holes 2 are provided on the surface of the bottom plate 3. The positions of the through holes 2 correspond to the positions of the mounting holes on the cylinder head b. The centers of the holes and the centers of the mounting holes on the cylinder head b are distributed on arcs with the same radius. The diameter of the through holes 2 is the same as the diameter of the mounting holes on the cylinder head b, and the distance between two adjacent through holes 2 is the same as the distance between two adjacent mounting holes on the cylinder head b.

[0033] See also Figure 5 The cylinder head stud c passes through the through hole 2 and the mounting hole of the cylinder head b, and the bottom plate 3 of the cylinder end face lifting fixture 1 is fixedly mounted on the upper plane of the cylinder head b through the lifting nut 8.

[0034] The process of the whole machine lifting operation is as follows:

[0035] See also Figure 5 The cylinder head b is installed on the cylinder block by the cylinder head studs c and cylinder head nuts 8 passing through its mounting holes. Figure 4 First, install the eight cylinder lifting fixtures a required for the separate transportation of conventional cylinder blocks; then remove the four cylinder head nuts 8 on the outer side of the cylinder head at the front end of the cylinder block, place the four through holes 2 on the bottom plate 3 on the upper plane of the cylinder head b corresponding to the mounting holes on the cylinder head b, and the cylinder head studs c pass through the mounting holes of the cylinder head b and the through holes 2 of the bottom plate 3, then screw the lifting nuts 8 into the threads at the upper ends of the cylinder head studs c, and fix the bottom plate 3 on the upper plane of the cylinder head b, thereby completing the installation of the cylinder end face lifting fixture 1 at the front end of the cylinder block; install another cylinder end face lifting fixture 1 to the upper plane of the cylinder head b at the rear end of the cylinder block in the same manner.

[0036] After the two cylinder end face lifting fixtures 1 are installed, when the whole machine needs to be lifted for transportation, slings or shackles are respectively inserted into the twelve lifting holes of the ten lifting fixtures (each cylinder lifting fixture a has one lifting hole, and each cylinder end face lifting fixture 1 has two lifting holes 7) of the eight cylinder lifting fixtures a and the two cylinder end face lifting fixtures 1, and the lifting operation of the whole machine for transportation and lifting is completed in cooperation with the lifting beam and the crane.

[0037] Please refer to Figure 4 and Figure 5 , the specific steps are as follows:

[0038] 1) Install eight cylinder lifting fixtures a on the upper planes on both sides of the cylinder head b respectively;

[0039] 2) First remove the four cylinder head nuts 8 on the outer side of the cylinder head at the front end of the cylinder block, then place the four through holes 2 on the bottom plate 3 on the upper plane of the cylinder head b in correspondence with the mounting holes on the cylinder head b, and pass the cylinder head studs c through the mounting holes and through holes 2 of the cylinder head b, screw the lifting nuts 8 into the threads at the upper ends of the cylinder head studs c, thereby fixing the bottom plate 3 on the upper plane of the cylinder head b, and completing the installation of a cylinder end lifting fixture 1;

[0040] 3) Using the same method as step 2), install another cylinder end lifting tool 1 on the upper plane of the cylinder head b at the rear end of the cylinder;

[0041] 4) Insert lifting belts or shackles into the lifting holes of the eight cylinder lifting fixtures a and the two cylinder end lifting fixtures 1 respectively, and cooperate with the lifting beam and the crane to complete the lifting operation of the marine low-speed diesel engine.

[0042] The cylinder end lifting device 1 can be removed by performing the reverse operation according to the above step 2).

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. All equivalent changes and modifications made according to the content of the present application should be within the technical scope of the present invention.

[0044] In summary, the present invention solves the problem that the original cylinder lifting tooling cannot meet the lifting requirements when the marine low-speed diesel engine is lifted for whole-machine transportation, thereby saving the operation process cost and ensuring the safety of the lifting operation.

Claims

1. A method for lifting a complete low-speed marine diesel engine, wherein the cylinder head of the low-speed marine diesel engine is provided with a mounting hole and is mounted on the cylinder body through a cylinder head stud, characterized in that: The lifting method is realized by a cylinder end lifting tool and an existing cylinder lifting tool, wherein the cylinder end lifting tool comprises a bottom plate, a side plate, two main lifting plates and four lifting nuts, the bottom plate is horizontally arranged, and four through holes for passing the cylinder head studs are arranged on the plate surface, and the positions of the through holes correspond to the positions of the mounting holes on the cylinder head, the two main lifting plates are vertically welded to both sides of the upper plane of the bottom plate, the main lifting plates are provided with lifting holes for passing the lifting belts or shackles, the side plates are vertically welded between the two main lifting plates, and are welded and fixed to the bottom plate at the same time; the cylinder head studs pass through the mounting holes of the cylinder head and the through holes of the bottom plate, and the cylinder end lifting tool is fixed to the upper plane of the cylinder head by the lifting nuts; The specific operation steps of the lifting method are as follows: 1) Install eight cylinder lifting fixtures on the upper planes on both sides of the cylinder head respectively; 2) First remove the four cylinder head nuts on the outer side of the cylinder head at the front end of the cylinder block, then place the bottom plate on the upper plane of the cylinder head so that the four through holes correspond to the positions of the mounting holes on the cylinder head, the cylinder head studs pass through the mounting holes and through holes, and the lifting nuts are screwed into the upper ends of the cylinder head studs, thereby fixing the bottom plate on the cylinder head, and completing the installation of a cylinder end lifting tool; 3) Using the same method as step 2), install another cylinder end lifting tool on the cylinder head at the rear end of the cylinder; 4) Insert lifting belts or shackles into the lifting holes of the eight cylinder lifting fixtures and the two cylinder end lifting fixtures respectively, and cooperate with the lifting beam and the crane to complete the lifting operation of the marine low-speed diesel engine.

2. The method for lifting a complete low-speed marine diesel engine according to claim 1, characterized in that: The cylinder end lifting tool also includes a rib plate, which is located at the center of the side plate and fixedly welded between the side plate and the bottom plate.

3. The method for lifting a complete low-speed marine diesel engine according to claim 1, characterized in that: The center of the through hole and the center of the mounting hole of the cylinder cover are distributed on an arc of the same radius, and the aperture of the through hole is the same as the aperture of the mounting hole.

4. The method for lifting a complete low-speed marine diesel engine according to claim 1, characterized in that: The bottom plate has a concave shape in the middle to avoid interference with the valve member installed on the cylinder cover.

5. The method for lifting a complete low-speed marine diesel engine according to claim 1, characterized in that: The two main hanging plates are parallel to each other.

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