A lifting device and method for through-bolts of ship main engine

Abstract

A lifting device and method for a through-bolt of a ship main engine, wherein the lifting device tightly clasps the through-bolt under the intermediate ring, and comprises two semicircular ring bodies with left-right symmetry, the two semicircular ring bodies are hinged together by a hinge on the rear side and can be aligned into a ring, and locked by a locking device on the front side, the upper part of the semicircular ring body is a contact surface whose internal shape matches the outer shape of the lower part of the intermediate ring, the contact surface fits tightly with the lower part of the intermediate ring, and the sides of the two semicircular ring bodies are symmetrically provided with a lifting lug for lifting. The present invention uses the intermediate ring structure on the middle section of the through-bolt to cooperate with conventional lifting equipment to pull the through-bolt out from the top of the main engine in two steps, conveniently and safely complete the removal of the through-bolt with an extra-long length, and achieves the effect of saving costs and improving production efficiency. It has the advantages of simple structure and convenient use, and can be generally used for the removal of the through-bolts of the main engine of the same cylinder diameter and type.

Description

Technical Field

[0001] The invention relates to a manufacturing process of a diesel engine, in particular to a lifting device and method for a through bolt of a ship main engine, belonging to the technical field of ship diesel engine manufacturing. Background Art

[0002] In the manufacturing process of marine diesel engines, after the main engine is submitted for trial run, it is necessary to split the main engine into two or three parts for shipment due to its heavy weight. Therefore, the through bolts connecting the main engine structure need to be removed from the through bolt holes on the main engine. Figure 3 The through bolt S is inserted into the through bolt hole below the upper plane T of the main engine cylinder body. An intermediate ring S1 is fixed on the middle section of the through bolt S, and a lifting eye hole S2 for connecting the lifting device R is provided at the top.

[0003] The specific process steps for lifting the through bolt S are as follows: first loosen the through bolt S, remove the nut, install the lifting device R on the lifting eyelet S2 at the top of the through bolt S, pull the through bolt S out of the upper plane T of the main engine cylinder by a crane, and then place it on the ground bracket. However, due to the high height of the main engine cylinder, the limited workshop height, and the complex upper structure of the main engine, there is not enough space above the upper plane T of the main engine cylinder to lift the through bolt out of the main engine in one step, which is convenient and quick. Usually, it requires complicated lifting steps or removal of other main engine parts to remove the through bolt, which not only wastes production time, but also affects the integrity of the main engine. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a lifting device and method for a through-bolt of a ship main engine, so as to conveniently and safely complete the removal of the through-bolt with extra-long length by means of an intermediate ring structure on the middle section of the through-bolt.

[0005] The technical solution of the present invention is as follows:

[0006] A lifting device for a through-bolt of a ship's main engine, a raised intermediate ring being provided on the middle section of the through-bolt, characterized in that: the lifting device is tightly clamped on the through-bolt below the intermediate ring, and comprises two semi-circular ring bodies with left-right symmetry, the two semi-circular ring bodies being hinged together by a hinge on the rear side and being able to be aligned into a circular ring, and being locked by a locking device on the front side, the upper part of the semi-circular ring body being a contact surface whose internal shape matches the outer shape of the lower part of the intermediate ring, the contact surface being tightly fitted to the lower part of the intermediate ring, and the sides of the two semi-circular ring bodies being symmetrically provided with a lifting ear for lifting.

[0007] Furthermore, the lower parts of the two semicircular rings are load-bearing surfaces that are in contact with the upper plane of the main engine cylinder body, and the load-bearing surfaces are finely processed to prevent damage to the upper plane.

[0008] Furthermore, the locking device comprises a locking hook and a locking groove, and the locking device achieves closed locking of the two semicircular ring bodies by embedding the locking hook into the locking groove.

[0009] Furthermore, the lifting device is an integral welded part.

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

[0011] A method for lifting a through bolt of a ship main engine using the above-mentioned lifting device comprises the following steps:

[0012] 1) Use a lifting device to slowly lift the through bolt, and stop lifting when the middle ring of the middle section of the through bolt is exposed 200 mm above the upper plane of the main engine cylinder body;

[0013] 2) opening the two semicircular rings, encircling the through bolts below the middle ring and then closing them, and then locking them with the locking device, thereby installing the lifting device on the through bolts;

[0014] 3) loosening the lifting device, so that the through bolt is placed on the upper plane of the main engine cylinder through the intermediate ring and the lifting device, and the upper plane of the main engine cylinder bears the weight of the through bolt through the load-bearing surface;

[0015] 4) The lifting device removed from the through bolt is connected and installed on the lifting lug of the lifting device, and the lifting device is slowly lifted, so that the through bolt is pulled out and separated from the upper plane of the main engine cylinder body.

[0016] Furthermore, in the step 2), when the lifting device is installed, the contact surface faces upward and is in close contact with the bottom of the intermediate ring, while the load-bearing surface faces downward.

[0017] Compared with the prior art, the present invention has achieved the following beneficial effects:

[0018] 1. The lifting device has a simple structure and is easy to use, which makes up for some shortcomings of traditional tools.

[0019] 2. The lifting device can be used for main engine through bolts of the same cylinder diameter and type, thereby reducing the number of tooling and saving production costs.

[0020] 3. The lifting method eliminates many cumbersome construction steps, saves a lot of production time, and realizes convenient and safe removal of through bolts. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is one of the schematic diagrams of the lifting device.

[0022] Figure 2 This is the second schematic diagram of the lifting device.

[0023] Figure 3 It is a schematic diagram of the method steps of the present invention.

[0024] In the figure:

[0025] A—lifting device, R—lifting fixture, S—through bolt, S1—intermediate ring, S2—lifting eye hole, T—upper plane of the main engine cylinder, 1—contact surface, 2—semicircular ring, 3—lifting ear, 4—locking device, 5—load-bearing surface, 6—hinge. DETAILED DESCRIPTION

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

[0027] The present invention is used for lifting the through bolts of the main engine of a ship. It cooperates with conventional lifting tools to pull the through bolts out from above the main engine in two steps. The second step is the key. The crane hook can be moved down several meters, saving lifting space, thereby conveniently completing the complex lifting work of the through bolts. A raised middle ring is provided on the middle section of the through bolt, and a lifting eye hole is provided on the top.

[0028] The lifting device is an integral welded part, tightly clamped on the through bolt under the intermediate ring, please refer to Figure 1 and Figure 2 The lifting device includes two semicircular ring bodies 2 with bilaterally symmetrical shapes, two lifting ears 3, a locking device 4 and a hinge 6.

[0029] The two semi-circular ring bodies 2 are the main body of the device, and their appearance is a two-half circular ring body, which needs to be put on the through bolt when working. Because the lifting device needs to be put on the through bolt when installed, it is designed in two halves. When installing, the two semi-circular ring bodies 2 are first opened, put on the through bolt, and then closed. The upper part of the semi-circular ring body 2 is a contact surface 1, which is a special structure that contacts the middle ring of the through bolt and fits tightly with the lower part of the middle ring. The internal shape of the contact surface 1 matches the lower shape of the middle ring to prevent damage to the through bolt during fitting. The lower part of the semi-circular ring body 2 is a special load-bearing structure, which is provided with a load-bearing surface 5 that contacts the upper plane of the main engine cylinder body. When the lifting device is installed, it needs to bear the weight of the through bolt for a period of time, so the load-bearing surface 5 is finely processed to prevent damage to the upper plane.

[0030] The hinge 6 is arranged at the rear side of the two semi-circular ring bodies 2, and hinges the two semi-circular ring bodies 2 together to form a ring; when the lifting device is opened, the hinge 6 connects the two semi-circular ring bodies 2.

[0031] The locking device 4 is arranged at the front side of the two semi-circular ring bodies 2, and is used to lock the two semi-circular ring bodies 2. The locking device 4 includes a locking hook and a locking groove. When the two semi-circular ring bodies 2 surround the through bolt, the locking hook is inserted into the locking groove to realize the closed locking of the two semi-circular ring bodies 2.

[0032] The lifting lug 3 is used for lifting the through bolt. The sides of the two semicircular ring bodies 2 are symmetrically provided with a lifting lug 3. During operation, the crane is connected to the lifting lug 3 through a lifting device to lift the through bolt.

[0033] The lifting method for the through bolt of the main engine of a ship described in the present invention can be found in Figure 3 , including the following steps:

[0034] 1) First, prepare for lifting the through bolt S. Use the lifting device R to slowly lift the through bolt S through the lifting eye hole S2. Stop lifting when the middle ring S1 of the middle section of the through bolt S is exposed about 200 mm above the upper plane T of the main engine cylinder body.

[0035] 2) Open the two semicircular ring bodies 2, surround them on the through bolt S below the intermediate ring S1 and then close them, and then lock them through the locking device 4, so that the lifting device A is installed on the through bolt S. When the lifting device A is installed, the contact surface 1 faces upward and is in close contact with the bottom of the intermediate ring S1, and the load-bearing surface 5 faces downward.

[0036] 3) Loosen the lifting device R, so that the through bolt S is placed on the upper plane T of the main engine cylinder through the intermediate ring S1 and the lifting device A, and the upper plane T of the main engine cylinder bears the weight of the through bolt S through the load-bearing surface 5.

[0037] 4) The lifting device R removed from the through bolt S is connected and installed on the lifting lug 3 of the lifting device A, and the lifting device A is slowly lifted, so that the through bolt S is pulled out and separated from the upper plane T of the main engine cylinder body.

[0038] In the 7X82B-HPSCR main engine project, the machine needs to be disassembled after the test run is submitted, but the through bolts cannot be removed without removing the main engine exhaust manifold assembly; because the main engine is very high, when the traditional lifting method of through bolts is used for lifting, the crane hook has risen to the highest point, and the lower end of the through bolt has not yet crossed the upper plane of the main engine cylinder body, and cannot be pulled out normally, so the exhaust manifold can only be removed, and the through bolt removal work can be carried out after removing the obstacles. After using the present invention, there is no need to remove the exhaust manifold, which saves working hours and improves production efficiency.

Claims

1. A method for lifting a through bolt of a ship main engine, wherein a raised intermediate ring is provided on the middle section of the through bolt, characterized in that: A lifting device is used for lifting, and the lifting device is tightly clamped on the through bolt under the intermediate ring, and includes two semicircular ring bodies with bilaterally symmetrical shapes. The two semicircular ring bodies are hinged together by a hinge on the rear side and can be aligned into a ring, and are locked by a locking device on the front side. The upper part of the semicircular ring body is a contact surface whose internal shape matches the outer shape of the lower part of the intermediate ring, and the contact surface is tightly fitted with the lower part of the intermediate ring. The sides of the two semicircular ring bodies are symmetrically provided with a lifting ear for lifting, and the lower part is a load-bearing surface that contacts the upper plane of the main engine cylinder body, and the load-bearing surface is finely processed to prevent damage to the upper plane; The lifting method comprises the following steps: 1) Use a lifting device to slowly lift the through bolt, and stop lifting when the middle ring of the middle section of the through bolt is exposed 200 mm above the upper plane of the main engine cylinder body; 2) opening the two semicircular rings, encircling the through bolts below the middle ring and then closing them, and then locking them with the locking device, thereby installing the lifting device on the through bolts; 3) loosening the lifting device, so that the through bolt is placed on the upper plane of the main engine cylinder through the intermediate ring and the lifting device, and the upper plane of the main engine cylinder bears the weight of the through bolt through the load-bearing surface; 4) The lifting device removed from the through bolt is connected and installed on the lifting lug of the lifting device, and the lifting device is slowly lifted, so that the through bolt is pulled out and separated from the upper plane of the main engine cylinder body.

2. The method for lifting a through bolt for a ship main engine according to claim 1, characterized in that: The locking device comprises a locking hook and a locking groove, and the locking device realizes the closed locking of the two semicircular ring bodies by embedding the locking hook into the locking groove.

3. The method for lifting a through bolt for a ship main engine according to claim 1, characterized in that: The lifting device is an integral welded part.

4. The method for lifting a through bolt for a ship main engine according to claim 1, characterized in that: In the step 2), when the lifting device is installed, the contact surface faces upward and is in close contact with the bottom of the intermediate ring, while the load-bearing surface faces downward.

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