A kind of tightening device of marine low-speed engine cylinder block splicing bolt

Abstract

The utility model relates to the technical field of diesel engine manufacturing, especially relates to a tightening device of marine low speed engine cylinder body splicing bolt, the tightening device of marine low speed engine cylinder body splicing bolt includes fixed plate, is provided with the step hole in the middle of fixed plate, is provided with the positioning hole below fixed plate, a plurality of support columns are slidably connected to the rear side of fixed plate, the fixed groove is fixedly connected with the inside step hole through fixed plate, the support groove is rotatably connected on the fixed groove, the tightening device of marine low speed engine cylinder body splicing bolt provided by the utility model has the advantages of convenient operation, safety controllable, can solve the problem that cylinder body splicing bolt is difficult to tighten, reduces bench work and machine tool load, does not need bench grinding or machine tool operation, and can directly complete bolt tightening, can guarantee tightening torque simultaneously, reduces the security risk.

Description

Technical Field

[0001] This utility model relates to the field of diesel engine manufacturing technology, and in particular to a tightening device for the cylinder block splicing bolts of a marine low-speed engine. Background Technology

[0002] In the manufacturing process of WINGD's high-power, low-speed marine X-series diesel engines, the cylinder block mostly adopts a segmented splicing structure, made of gray cast iron. It is positioned on both the fuel and exhaust sides of the connecting surface using four pin holes and secured with several ordinary bolt holes. However, during installation, due to the special design of the cylinder block structure and the original errors in casting dimensions, the bolt hole mounting surfaces are uneven. To ensure a flat mounting surface, all bolt hole mounting surfaces need to be back-scraped. Furthermore, to ensure consistent bolt protrusion after installation, the bolt hole mounting surfaces are all back-scraped to a uniform depth, resulting in varying countersunk depths, ranging from 2-3mm to 15-20mm. However, the bolt head thickness is only about 35mm, with nearly half of its thickness submerged in the hole. Therefore, the contact area between the hydraulic wrench and the bolt head is too small, making it easy for the wrench to slip out during installation. This prevents reliable and effective locking and tightening of the nut, and if it slips out, it can easily cause injury from falling objects, posing a certain safety hazard. The original tightening method involved directly inserting a hydraulic wrench into the bolt head for pump tightening. Before pump tightening, the protruding parts needed to be ground or milled off on a machine tool. In particular, there were ribs on the exhaust side and upper part of the cam side of the cylinder, which required a huge amount of grinding work, seriously affecting the workshop's production efficiency. Furthermore, the unevenness of some cylinder surfaces led to a decrease in the overall stability of the device, thus affecting the accuracy of subsequent tightening operations.

[0003] Therefore, it is necessary to provide a new tightening device for the cylinder block splicing bolts of marine low-speed engines to solve the above-mentioned technical problems. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a tightening device for the splicing bolts of marine low-speed engine cylinder blocks.

[0005] The tightening device for the splicing bolts of the marine low-speed engine cylinder block provided by this utility model includes: a fixed plate with a stepped hole in the middle and a positioning hole at the bottom. In use, the positioning hole allows for the insertion of a positioning pin to fix a hydraulic wrench, while also minimizing weight. To ensure strength and wear resistance, CrNiMo material is selected and its surface is hardened. Several support columns are slidably connected to the rear side of the fixed plate. A fixing groove is fixedly connected inside the stepped hole via the fixed plate, and a support groove is rotatably connected to the fixing groove. In use, an adapter sleeve is inserted into the fixed plate, with the inner hexagonal side of the adapter sleeve aligned with the bolt head and inserted. The outer hexagonal side of the adapter sleeve protrudes from the fixed plate. The hydraulic torque wrench is inserted into the outer hexagonal side of the adapter sleeve. A cylindrical positioning pin is used. Since the positioning pin requires frequent disassembly and assembly, and the hydraulic wrench rubs frequently with the positioning pin, CrNiMo is also used, with a surface hardened treatment to a hardness of HS= or higher to enhance its wear resistance. The hydraulic torque wrench is fixed to the plate through the positioning hole to prevent the wrench from rotating with the bolt during tightening.

[0006] Preferably, a support frame is fixedly connected inside the support groove, and a number of balls are provided on the support frame, which are tumbling inside the fixed groove.

[0007] Preferably, the support column has a threaded rod internally connected to a threaded rod, a worm gear is fixedly connected to the front end of the threaded rod, and a worm is meshed with the worm gear below the worm gear.

[0008] Preferably, a turntable is rotatably connected to the side of the fixed plate, and the turntable is fixedly connected to the worm gear in the middle.

[0009] Preferably, an adapter sleeve is inserted into the positioning hole.

[0010] Preferably, a lubricating oil inlet is provided above the fixing plate, and a lubricating oil inlet is provided above the fixing groove, with the lubricating oil inlet and the lubricating oil inlet communicating with each other.

[0011] Preferably, the lubricating oil inlet is connected to the inside of the fixed groove.

[0012] Compared with related technologies, the tightening device for the splicing bolts of marine low-speed engine cylinder blocks provided by this utility model has the following beneficial effects:

[0013] 1. Reduce the difficulty of bolt installation, lighten the workload of fitters, improve production efficiency and reduce safety risks.

[0014] 2. Convenient and quick, eliminating the need to process the protruding parts of the mounting surface on a machine tool, saving machine tool time.

[0015] 3. By adjusting the height of each support column, the fixing plate is made to be in a horizontal state to accommodate any unevenness on the cylinder block surface, thus ensuring the stability and accuracy of subsequent tightening operations. Attached Figure Description

[0016] Figure 1 A schematic diagram of a preferred embodiment of the tightening device for the cylinder block splicing bolts of the marine low-speed engine provided by this utility model;

[0017] Figure 2 for Figure 1 The diagram shows the structure of the stepped hole;

[0018] Figure 3 for Figure 2 The diagram shows the structure of the fixing groove.

[0019] Figure 4 for Figure 3 The diagram shows the structure of the ball bearing.

[0020] Figure 5 for Figure 1 The diagram shows the structure of the threaded rod.

[0021] Figure 6 for Figure 5 The diagram shows a support column drive structure.

[0022] Figure 7 for Figure 1 The diagram shown illustrates the actual process of tightening bolts.

[0023] The following are the labels in the diagram: 1. Fixing plate; 2. Positioning hole; 3. Adapter sleeve; 4. Turntable; 5. Support column; 6. Lubricating oil inlet; 7. Stepped hole; 8. Support groove; 9. Lubricating oil inlet; 10. Fixing groove; 11. Support frame; 12. Ball bearing; 13. Threaded rod; 14. Worm gear; 15. Worm. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0026] Please see Figures 1 to 7This utility model provides a tightening device for the splicing bolts of a marine low-speed engine cylinder block. The tightening device includes: a fixing plate 1, a stepped hole 7 in the middle of the fixing plate 1, and a positioning hole 2 at the bottom of the fixing plate 1. In use, the positioning hole 2 can be used to insert a positioning pin for fixing a hydraulic wrench, while also minimizing weight. To ensure strength and wear resistance, the material is 40CrNiMo, with surface hardening. Several support columns 5 are slidably connected to the rear side of the fixing plate 1. A fixing groove 10 is fixedly connected inside the stepped hole 7 through the fixing plate 1. The upper part has a rotatable support groove 8. When in use, the adapter sleeve 3 is installed into the fixed plate 1. The inner hexagonal side of the adapter sleeve 3 is aligned with the bolt head and installed. The outer hexagonal side of the adapter sleeve 3 protrudes from the fixed plate 1. The hydraulic torque wrench is inserted into the outer hexagonal side of the adapter sleeve 3. A cylindrical positioning pin is used. The positioning pin needs to be frequently disassembled and assembled. The hydraulic wrench and the positioning pin rub frequently. Therefore, 40CrNiMo is also used. The surface is hardened to a hardness of HS=75 or higher to enhance its wear resistance. The hydraulic torque wrench is fixed on the plate through the positioning hole 2 to prevent the wrench from rotating with the bolt when tightening.

[0027] In the embodiments of this utility model, please refer to Figures 2 to 4 A support frame 11 is fixedly connected inside the support groove 8. Several balls 12 are provided on the support frame 11. The balls 12 are tumbling inside the fixed groove 10, allowing the support groove 8 to rotate flexibly on the fixed groove 10.

[0028] In the embodiments of this utility model, please refer to Figure 5 and Figure 6 The support column 5 is internally threaded with a threaded rod 13. A worm gear 14 is fixedly connected to the front end of the threaded rod 13. A worm 15 is meshed below the worm gear 14. A turntable 4 is rotatably connected to the side of the fixing plate 1. The middle of the turntable 4 is fixedly connected to the worm 15. Rotating the turntable 4 causes the worm 15 to rotate, which in turn causes the worm gear 14 to rotate, thereby causing the threaded rod 13 to rotate. The support column 5 will move up and down along the axial direction of the threaded rod 13, thereby achieving precise adjustment of the height of the support column 5. By adjusting the height of each support column 5, the fixing plate 1 is kept in a horizontal state to adapt to the unevenness that may exist on the surface of the cylinder block, ensuring the stability and accuracy of subsequent tightening operations.

[0029] In the embodiments of this utility model, please refer to Figure 1 and Figure 2An adapter sleeve 3 is inserted into the positioning hole 2. The size of its inner hexagonal side should be consistent with the size of the hexagonal head of the splicing bolt on the cylinder body, and the size of its outer hexagonal side should be consistent with the size of the hexagonal head on the hydraulic wrench. The adapter sleeve 3, splicing bolt and hydraulic wrench are all clearance fit. During use, due to repeated disassembly and assembly, wear is easy to occur. Therefore, its outer surface should be heated and quenched to obtain a high-hardness wear-resistant surface. At the same time, since the tightening torque can reach 8000Nm, in order to ensure that the strength meets the requirements, the material is 40CrNiMo, and the surface is hardened.

[0030] In the embodiments of this utility model, please refer to Figure 2 and Figure 3 A lubricating oil inlet 6 is provided above the fixed plate 1, and a lubricating oil inlet 9 is provided above the fixed groove 10. The lubricating oil inlet 6 and the lubricating oil inlet 9 are connected. The lubricating oil inlet 9 is connected to the inside of the fixed groove 10. Lubricating oil is injected into the device through the lubricating oil inlet 6. The lubricating oil flows into the lubricating oil inlet 9 along the lubricating oil inlet 6 and then into the inside of the fixed groove 10. The lubricating oil can fully lubricate the contact surface between the ball 12 and the fixed groove 10, reduce the friction when the ball 12 rolls, further reduce the wear of the components, and extend the service life of the device.

[0031] The working principle of the tightening device for the splicing bolts of the marine low-speed engine cylinder block provided by this utility model is as follows: When tightening the bolts, first observe the surface condition of the bolts and remove the burrs. Insert the adapter sleeve 3 into the fixing plate 1, aligning the hexagonal side of the adapter sleeve 3 with the bolt head. Then, rotate the turntable 4 to drive the worm gear 15 to rotate, which in turn drives the worm wheel 14 to rotate, thereby causing the threaded rod 13 to rotate. The support column 5 will move up and down along the axial direction of the threaded rod 13, thus achieving precise adjustment of the height of the support column 5. By adjusting the height of each support column 5, the fixing plate 1 is kept in a horizontal state to adapt to the unevenness that may exist on the cylinder block surface, ensuring the stability and accuracy of subsequent tightening operations. The inner side of the adapter sleeve 3 is in close contact with the support groove 8, which can rotate flexibly on the fixing groove 10. Lubricating oil is injected into the device through the lubricating oil inlet 6, and the lubricating oil flows into the lubricating oil inlet 6. The lubricating oil enters the fixed groove 10 through the port 9, and then fully lubricates the contact surface between the ball 12 and the fixed groove 10, reducing the friction when the ball 12 rolls, further reducing component wear, extending the service life of the device, and ensuring the flexibility and stability of the rotation of the support groove 8, ensuring the efficient tightening operation. When the hydraulic wrench tightens the bolt through the special adapter sleeve 3, the support groove 8 can rotate synchronously with the bolt as the bolt rotates, reducing the frictional resistance caused by rotation, ensuring a smoother tightening process, and also reducing the wear on various parts of the device. The outer hexagonal side of the adapter sleeve 3 protrudes from the fixed plate 1. The hydraulic torque wrench is inserted into the outer hexagonal side of the adapter sleeve 3. Using the cylindrical positioning pin, the hydraulic torque wrench is fixed on the plate through the positioning hole 2 to prevent the wrench from rotating with the bolt during tightening. After tightening the bolt according to the set torque, the device is put into the next bolt hole to continue pumping until the end.

[0032] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A tightening device for the splicing bolts of a marine low-speed engine cylinder block, characterized in that, include: Fixing plate (1); a stepped hole (7) is provided in the middle of the fixing plate (1), and a positioning hole (2) is provided at the bottom of the fixing plate (1); Support columns (5), and a plurality of support columns (5) are slidably connected to the rear side of the fixing plate (1); The support groove (8) is fixedly connected to the inside of the stepped hole (7) by a fixing plate (1) and the support groove (8) is rotatably connected to the fixing groove (10).

2. The tightening device for the splicing bolts of the marine low-speed engine cylinder block according to claim 1, characterized in that, A support frame (11) is fixedly connected inside the support groove (8). Several balls (12) are provided on the support frame (11), and the balls (12) are tumbling connected inside the fixed groove (10).

3. The tightening device for the splicing bolts of the marine low-speed engine cylinder block according to claim 1, characterized in that, The support column (5) is internally threaded with a threaded rod (13), and a worm gear (14) is fixedly connected to the front end of the threaded rod (13). A worm (15) is meshed below the worm gear (14).

4. The tightening device for the splicing bolts of the marine low-speed engine cylinder block according to claim 3, characterized in that, The fixed plate (1) is rotatably connected to a turntable (4) on its side, and the turntable (4) is fixedly connected to a worm gear (15) in the middle.

5. The tightening device for the splicing bolts of the marine low-speed engine cylinder block according to claim 1, characterized in that, An adapter sleeve (3) is inserted into the positioning hole (2).

6. The tightening device for the splicing bolts of the marine low-speed engine cylinder block according to claim 1, characterized in that, A lubricating oil inlet (6) is provided above the fixing plate (1), and a lubricating oil inlet (9) is provided above the fixing groove (10). The lubricating oil inlet (6) and the lubricating oil inlet (9) are connected.

7. The tightening device for the splicing bolts of the marine low-speed engine cylinder block according to claim 6, characterized in that, The lubricating oil inlet (9) is connected to the interior of the fixed groove (10).

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