Turnover tool for marine diesel engine base main bearing cover

Abstract

The utility model relates to the field of hoisting, in particular to a turnover tool for a main bearing cover of a marine diesel engine base, which comprises a hanging bracket, four upper steel wire ropes are symmetrically mounted at the top of the hanging bracket, and lower steel wire ropes are symmetrically mounted at the bottom of the hanging bracket. An adjusting assembly is installed in the middle of the hanging bracket, a main bearing cover is arranged at the bottom of the hanging bracket, threaded holes are formed in the two sides of the main bearing cover correspondingly, lifting lug screws are installed in the threaded holes correspondingly, the ends of the lifting lug screws are connected with a lower steel wire rope, and each lifting lug screw is composed of a threaded shaft and a shaft sleeve; according to the turnover tool for the marine diesel engine base main bearing cover, the distance between the lower steel wire ropes is adjusted through the adjusting assembly, the shaft sleeve and the threaded shaft are fixedly installed through the clamping assembly, and the turnover tool has the advantages of being convenient to assemble and disassemble, reliable in connection, capable of being flexibly matched with main bearing covers of different specifications and capable of reducing labor intensity.

Description

Technical Field

[0001] This utility model relates to the field of lifting, and in particular to a turning tool for the main bearing cover of a marine diesel engine base. Background Technology

[0002] The main bearing cap and main bearing housing of marine diesel engine mount are the main components that bear the rotation of crankshaft. The main bearing cap needs to be turned over multiple times during machining, hoisting, finishing and installation. The main bearing cap has an "H" shaped structure, which is complex, irregular, heavy and has no lifting lugs, which makes it difficult to turn the main bearing cap over.

[0003] Traditional turning tools often use a lifting frame design with only two lifting points. This type of lifting frame structure is bulky, making it extremely inconvenient to move, severely consuming the physical strength of operators, and reducing work efficiency. Moreover, the loading and unloading process is also extremely cumbersome, requiring a lot of time and seriously affecting the overall work progress. In addition, when turning and lifting the main bearing cover, the two lifting points are not able to evenly distribute the weight, making it easy for the main bearing cover to sway during the lifting process. This makes it difficult to lift the main bearing cover stably, which not only greatly increases the risk of the main bearing cover being damaged by impact, but may also cause serious safety accidents.

[0004] Furthermore, conventional tooling involves complex installation and disassembly processes when connected to the main bearing cap, making it difficult to achieve rapid assembly and disassembly, resulting in a lack of smooth operation. Moreover, the main bearing caps of different marine diesel engines vary greatly in size and structure, and existing tooling lacks an effective adjustment mechanism, making it unable to flexibly adapt to various main bearing caps and greatly limiting its application scope.

[0005] Therefore, it is necessary to provide a new turning tool for the main bearing cover of marine diesel engine housing to solve the above-mentioned technical problems. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a turning tool for the main bearing cover of marine diesel engine base.

[0007] The overturning fixture for the main bearing cover of a marine diesel engine base provided by this utility model includes: a hanger, four upper steel wire ropes symmetrically installed on the top of the hanger, lower steel wire ropes symmetrically installed on the bottom of the hanger, an adjusting component for adjusting the spacing of the lower steel wire ropes installed in the middle of the hanger, a main bearing cover provided at the bottom of the hanger, threaded holes on both sides of the main bearing cover, lifting lug screws installed inside the threaded holes, the ends of the lifting lug screws being connected to the lower steel wire ropes, the lifting lug screws being composed of a threaded shaft and a bushing, one end of the threaded shaft being threadedly connected to the threaded hole, the other end of the threaded shaft being rotatably connected to the bushing, and a clamping component for clamping the threaded shaft being installed inside the bushing.

[0008] Preferably, the hanger is welded from four upper hanging plates and two steel pipes. Two lower hanging plates are symmetrically slidably connected to the surfaces of the two steel pipes. The top of the upper hanging plates is fixed to the top of the corresponding upper steel wire rope, and the bottom of the lower hanging plates is fixed to the corresponding lower steel wire rope.

[0009] Preferably, the adjustment assembly includes: a drive box, a bidirectional threaded rod, a worm gear, a worm, and a motor. The drive box is fixedly connected to the middle of the steel pipe. The bidirectional threaded rod is rotatably connected to the bottom of the drive box. The bidirectional threaded rod is rotatably connected to four upper hanging plates and threadedly connected to two lower hanging plates. The worm gear is fixedly connected to the middle of the bidirectional threaded rod. The worm is rotatably connected inside the drive box. The worm gear meshes with the worm. The motor is fixedly connected inside the drive box. The output end of the motor is fixed to the worm.

[0010] Preferably, the snap-fit ​​assembly includes: a slot, a knob, a shaft, a locking block, a spring, and a steel ball. The side of the bushing has four slots equidistantly spaced, and the side of the bushing is equidistantly rotatably connected to four knobs. The side of the knob near the bushing is fixedly connected to the shaft. The side of the shaft near the threaded shaft is symmetrically fixedly connected to locking blocks. The bottom of the shaft is fixedly connected to a spring, and the bottom of the spring is fixedly connected to a steel ball.

[0011] Preferably, the slot consists of a long slot, a short slot, and a connecting slot, wherein the length of the short slot is only half that of the long slot, the connecting slot is located at the bottom of the long slot and the short slot, and the long slot and the short slot are connected through the connecting slot.

[0012] Preferably, one end of the threaded shaft has a semi-circular groove, and the steel ball is engaged in the semi-circular groove.

[0013] Preferably, the thread length of the bidirectional threaded rod is equal to the distance between the two upper hanging plates located on the same side of the steel pipe.

[0014] Compared with related technologies, the turning fixture for the main bearing cover of marine diesel engine housing provided by this utility model has the following beneficial effects:

[0015] Easy to load and unload and reliable connection:

[0016] The unique design of the lifting lug screw allows workers to quickly connect the bushing and the threaded shaft by simply screwing the threaded shaft into the threaded hole of the main bearing cap, pressing down and rotating the knob. This simplifies the installation process, significantly reduces preparation time before operation, and greatly improves loading and unloading efficiency compared to the complex connection methods of traditional tooling.

[0017] In the snap-fit ​​assembly, the spring pushes the steel ball into the semi-circular groove of the threaded shaft, while the locking block enters the short groove from the long groove through the connecting groove and continuously squeezes the spring. Multiple protections maintain the limit on the threaded shaft and prevent it from loosening. This design greatly improves the stability of the connection between the tooling and the main bearing cover and reduces the safety risks caused by loose connection during hoisting and turning.

[0018] Flexible adaptation to main bearing caps of different specifications:

[0019] The adjustment assembly uses a motor-driven worm gear to rotate a bidirectional threaded rod, allowing the lower lifting plate to slide along the steel pipe and precisely adjust the spacing of the lower wire rope. The thread length of the bidirectional threaded rod is carefully designed to ensure that the adjustment range of the lower lifting plate can cover the size differences of the main bearing caps of different models of marine diesel engines, greatly enhancing the versatility of the tooling and avoiding the trouble of changing tooling due to different main bearing cap specifications, thus reducing equipment procurement and management costs.

[0020] Reduce labor intensity:

[0021] The lightweight design of the hanger allows workers to handle it manually, which greatly reduces the labor intensity of operators, improves the working environment, and makes the work process smoother compared to traditional heavy equipment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overturning fixture for the main bearing cover of a marine diesel engine housing provided by this utility model.

[0023] Figure 2 for Figure 1 The diagram shows the structure of the hanger.

[0024] Figure 3 for Figure 2 The diagram shows a cross-sectional view of the drive box.

[0025] Figure 4 for Figure 1 The diagram shown is a structural schematic of the lifting lug screw;

[0026] Figure 5 for Figure 4 The diagram shows the structure of the card slot;

[0027] Figure 6 for Figure 4 The diagram shows the structure of the threaded shaft.

[0028] The following are the labels in the diagram: 1. Hanger; 2. Upper wire rope; 3. Lower wire rope; 4. Main bearing cap; 5. Lifting lug screw; 6. Threaded shaft; 7. Bushing; 8. Upper lifting plate; 9. Steel pipe; 10. Lower lifting plate; 11. Drive box; 12. Double-threaded rod; 13. Worm gear; 14. Worm; 15. Motor; 16. Slot; 17. Knob; 18. Shaft; 19. Block; 20. Spring; 21. Steel ball; 22. Long slot; 23. Short slot; 24. Connecting slot; 25. Semicircular slot. Detailed Implementation

[0029] 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 for explaining the present utility model and are not intended to limit the present utility model.

[0030] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0031] Please see Figures 1 to 6 A turning fixture for a marine diesel engine main bearing cover includes: a hanger 1, four upper steel wire ropes 2 symmetrically installed on the top of the hanger 1, lower steel wire ropes 3 symmetrically installed on the bottom of the hanger 1, an adjusting component for adjusting the spacing of the lower steel wire ropes 3 installed in the middle of the hanger 1, a main bearing cover 4 at the bottom of the hanger 1, threaded holes on both sides of the main bearing cover 4, and lifting lug screws 5 installed inside the threaded holes. The ends of the lifting lug screws 5 are connected to the lower steel wire ropes 3. The lifting lug screws 5 consist of a threaded shaft 6 and a bushing 7. One end of the threaded shaft 6 is threaded into the threaded hole, and the other end of the threaded shaft 6 is rotatably connected to the bushing 7. A clamping component for clamping the threaded shaft 6 is installed inside the bushing 7. The hanger 1 is welded from four upper lifting plates 8 and two steel pipes 9, with two symmetrical sliding connections on the surfaces of the two steel pipes 9. The top of the lower hanging plate 10 and the upper hanging plate 8 are respectively fixed to the top of the corresponding upper steel wire rope 2, and the bottom of the lower hanging plate 10 is respectively fixed to the corresponding lower steel wire rope 3. The adjustment assembly includes: drive box 11, double threaded rod 12, worm wheel 13, worm 14 and motor 15. The drive box 11 is fixedly connected to the middle of the steel pipe 9. The bottom of the drive box 11 is rotatably connected to the double threaded rod 12. The double threaded rod 12 is rotatably connected to the four upper hanging plates 8. The double threaded rod 12 is threadedly connected to the two lower hanging plates 10. The worm wheel 13 is fixedly connected to the middle of the double threaded rod 12. The worm 14 is rotatably connected inside the drive box 11. The worm wheel 13 is meshed with the worm 14. The motor 15 is fixedly connected inside the drive box 11. The output end of the motor 15 is fixed to the worm 14. The thread length of the double threaded rod 12 is equal to the distance between the two upper hanging plates 8 located on the same side of the steel pipe 9.

[0032] It should be noted that the center of gravity of the drive component is collinear with the center of gravity of the steel pipe 9, and the installation of the drive component will not affect the balance of the hanger 1.

[0033] Please see Figure 1 , Figures 4 to 6The snap-fit ​​assembly includes: a snap-fit ​​groove 16, a knob 17, a rotating shaft 18, a snap-fit ​​block 19, a spring 20, and a steel ball 21. Four snap-fit ​​grooves 16 are equidistantly provided on the side of the bushing 7. Four knobs 17 are equidistantly rotatably connected to the side of the bushing 7. A rotating shaft 18 is fixedly connected to the side of the knob 17 near the bushing 7. A snap-fit ​​block 19 is symmetrically fixedly connected to the side of the rotating shaft 18 near the end of the threaded shaft 6. A spring 20 is fixedly connected to the bottom of the rotating shaft 18. A steel ball 21 is fixedly connected to the bottom of the spring 20. The snap-fit ​​groove 16 is composed of a long groove 22, a short groove 23, and a connecting groove 24. The length of the short groove 23 is only half that of the long groove 22. The connecting groove 24 is located at the bottom of the long groove 22 and the short groove 23. The long groove 22 and the short groove 23 are connected through the connecting groove 24. A semi-circular groove 25 is provided at one end of the threaded shaft 6. The steel ball 21 is snapped into the semi-circular groove 25.

[0034] It should be noted that when the locking block 19 is located in the short groove 23, the short groove 23 effectively restricts the position of the locking block 19, so that the locking block 19 continuously compresses the spring 20. Because the spring 20 is compressed by the locking block 19, it continuously applies force to the steel ball 21 to maintain the limit on the threaded shaft 6.

[0035] The working principle of the overturning fixture for the main bearing cover of a marine diesel engine provided by this utility model is as follows:

[0036] Tooling installation stage:

[0037] Before hoisting the main bearing cover 4, the workers first screwed the threaded shaft 6 of the lifting lug screw 5 into the pre-set threaded holes on both sides of the main bearing cover 4 to ensure the reliability of the threaded connection. Then, the bushing 7 was put on the extended threaded shaft 6, and the clamping operation began. The workers pressed down the knob 17 and rotated it 90° clockwise. This action caused the knob 17 to press the rotating shaft 18. During the downward movement of the rotating shaft 18, the spring 20 at the bottom was compressed at the same time. The elastic force generated by the spring 20 pushed the steel ball 21 into the semi-circular groove 25 at the end of the threaded shaft 6, thus initially achieving the connection of the threaded shaft 6. The locking mechanism is fixed in place. At the same time, the locking block 19 fixed on the rotating shaft 18 moves from the long groove 22 on the side of the bushing 7 as the rotating shaft 18 rotates. The locking block 19 enters the short groove 23 through the connecting groove 24. The short groove 23 effectively restricts the position of the locking block 19, so that the locking block 19 continuously compresses the spring 20. The spring 20, due to being compressed by the locking block 19, continuously applies force to the steel ball 21 to maintain the limit on the threaded shaft 6 and prevent the threaded shaft 6 from loosening. Finally, the lower wire rope 3 is connected to the bushing 7 of the lifting lug screw 5 to complete the installation of the tooling and the main bearing cover 4.

[0038] Spacing adjustment stage:

[0039] Given the differences in the size of the main bearing cap 4 of different marine diesel engines, the spacing of the lower wire rope 3 needs to be adjusted to accommodate the main bearing cap 4 of different specifications. When the spacing needs to be adjusted, the motor 15 in the drive box 11 is started. The output shaft of the motor 15 drives the worm gear 14 to rotate, and the worm wheel 13 meshing with the worm gear 14 rotates accordingly, thereby driving the bidirectional threaded rod 12 to rotate synchronously. The bidirectional threaded rod 12 is threadedly connected to the two lower hanging plates 10 and rotatably connected to the four upper hanging plates 8. During the rotation of the bidirectional threaded rod 12, the lower hanging plates 10 will slide along the surface of the steel pipe 9 to achieve precise adjustment of the spacing of the lower wire rope 3. The thread length of the bidirectional threaded rod 12 is reasonably designed, and its length is exactly equal to the spacing between the two upper hanging plates 8 on the same side of the steel pipe 9, ensuring that the lower hanging plates 10 move within a suitable range, thereby accurately adapting to the main bearing cap 4 of different sizes.

[0040] Lifting and turning phase:

[0041] After the tooling installation and spacing adjustment are completed, the four upper steel wire ropes 2 on the top of the lifting frame 1 are hooked by the lifting equipment to start the stable lifting. Compared with the traditional double-point lifting frame 1, the design of the four upper steel wire ropes 2 and symmetrically distributed lower steel wire ropes 3 used in this tooling can more evenly distribute the weight of the main bearing cover 4, significantly improving the stability of the lifting process. If it is necessary to turn the main bearing cover 4 over during the lifting process, the operator can use the lifting and swinging functions of the lifting equipment, in conjunction with the connection structure of the tooling, to achieve the safe turning of the main bearing cover 4. Throughout the lifting and turning process, the tooling always maintains a reliable connection with the main bearing cover 4, effectively reducing the risk of the main bearing cover 4 being damaged by impact and greatly improving the work efficiency.

[0042] 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 turning fixture for the main bearing cap of a marine diesel engine base, characterized in that, include: Hanger (1), with four upper steel wire ropes (2) symmetrically installed on the top of the hanger (1) and lower steel wire ropes (3) symmetrically installed on the bottom of the hanger (1); An adjustment assembly is installed in the middle of the hanger (1) for adjusting the spacing of the lower wire rope (3); The main bearing cover (4) is provided at the bottom of the hanger (1). The main bearing cover (4) has threaded holes on both sides. The threaded holes are equipped with lifting lug screws (5). The end of the lifting lug screw (5) is connected to the lower wire rope (3). The lifting lug screw (5) is composed of a threaded shaft (6) and a bushing (7). One end of the threaded shaft (6) is threaded into the threaded hole, and the other end of the threaded shaft (6) is rotatably connected to the bushing (7). The snap-fit ​​assembly is installed inside the bushing (7) for snapping the threaded shaft (6).

2. The overturning fixture for the main bearing cover of a marine diesel engine mount according to claim 1, characterized in that, The hanger (1) is welded together from four upper hanging plates (8) and two steel pipes (9). Two lower hanging plates (10) are symmetrically slidably connected to the surfaces of the two steel pipes (9). The top of the upper hanging plates (8) is fixed to the top of the corresponding upper steel wire rope (2), and the bottom of the lower hanging plates (10) is fixed to the corresponding lower steel wire rope (3).

3. The turning fixture for the main bearing cover of a marine diesel engine mount according to claim 2, characterized in that, The adjustment assembly includes: a drive box (11), a double-threaded rod (12), a worm gear (13), a worm (14), and a motor (15). The drive box (11) is fixedly connected to the middle of the steel pipe (9). The double-threaded rod (12) is rotatably connected to the bottom of the drive box (11). The double-threaded rod (12) is rotatably connected to four upper hanging plates (8). The double-threaded rod (12) is threadedly connected to two lower hanging plates (10). The worm gear (13) is fixedly connected to the middle of the double-threaded rod (12). The worm (14) is rotatably connected inside the drive box (11). The worm gear (13) meshes with the worm (14). The motor (15) is fixedly connected inside the drive box (11). The output end of the motor (15) is fixed to the worm (14).

4. The overturning fixture for the main bearing cover of a marine diesel engine mount according to claim 1, characterized in that, The snap-fit ​​assembly includes: a slot (16), a knob (17), a shaft (18), a locking block (19), a spring (20), and a steel ball (21). The bushing (7) has four slots (16) equidistantly arranged on its side. The bushing (7) has four knobs (17) equidistantly rotatably connected to its side. The shaft (18) is fixedly connected to the side of the knob (17) near the bushing (7). The locking block (19) is symmetrically fixedly connected to the side of the shaft (18) near the threaded shaft (6). The bottom of the shaft (18) is fixedly connected to the spring (20), and the bottom of the spring (20) is fixedly connected to the steel ball (21).

5. The overturning fixture for the main bearing cover of a marine diesel engine mount according to claim 4, characterized in that, The slot (16) consists of a long slot (22), a short slot (23) and a connecting slot (24). The short slot (23) is only half the length of the long slot (22). The connecting slot (24) is located at the bottom of the long slot (22) and the short slot (23). The long slot (22) and the short slot (23) are connected through the connecting slot (24).

6. The turning fixture for the main bearing cover of a marine diesel engine mount according to claim 4, characterized in that, A semi-circular groove (25) is provided at one end of the threaded shaft (6), and a steel ball (21) is engaged in the semi-circular groove (25).

7. The turning fixture for the main bearing cover of a marine diesel engine mount according to claim 3, characterized in that, The thread length of the bidirectional threaded rod (12) is equal to the distance between the two upper hanging plates (8) located on the same side of the steel pipe (9).

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