Marine crankshaft shrinkage fit lifting platform with self-locking function

Abstract

The invention provides a marine crankshaft shrinkage fit lifting platform with a self-locking function, and relates to the technical field of crankshaft assembly.The marine crankshaft shrinkage fit lifting platform comprises a bottom plate, a lifting box is arranged on the bottom plate, a lifting rod is installed on the lifting box, a top plate is arranged at the upper end of the lifting rod, a plurality of slings are arranged on the lower surface of the top plate, and hoisting mechanisms are arranged at the lower ends of the slings; the hoisting mechanism is used for hoisting the crankshaft shrinkage fit, a self-locking assembly is further arranged on the lifting box and used for limiting movement of the lifting rod, and a limiting assembly is further arranged on the lifting rod and used for limiting swinging of the sling. By arranging the self-locking assembly and the limiting assembly, when the crankshaft shrinkage fit is hoisted and adjusted, if an abnormal condition occurs, the self-locking assembly can quickly lock the lifting rod, a top plate is prevented from falling, and the risk of structural damage caused by the fact that the crankshaft shrinkage fit collides with the ground is effectively avoided; the limiting assembly effectively inhibits swinging of the sling, stable hoisting of the crankshaft shrinkage fit is ensured, and the falling probability of the crankshaft shrinkage fit can be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of crankshaft assembly, and particularly to a marine crankshaft shrink fit lifting platform with a self-locking function. Background Technique

[0002] Between the marine semi-built crankshaft components, they are assembled by using the interference fit of the shaft hole size and the shrink fit method. The assembly is divided into two processes: single assembly and complete assembly. Single assembly is the assembly between the rotating shaft parts and the crank throws. Only the shaft parts need to be lifted, and ensuring that their axes coincide with the center line of the crank hot-fitting hole can complete the assembly, forming a combination of a crank and a shaft. Complete assembly is the assembly completed between the assembled combinations in sequence, and it is the assembly process of inserting the shaft of one combination into the crank hot-fitting hole of another combination;

[0003] After the traditional lifting platform lifts the crankshaft shrink fit, if power interruption or abnormal conditions occur, its lifting plate is prone to slipping, resulting in the impact of the crankshaft shrink fit on the ground, causing structural damage to the crankshaft shrink fit; in addition, the sling will swing due to inertia during the lifting process, which is also likely to cause the imbalance of the crankshaft shrink fit during lifting, further increasing the risk of the crankshaft shrink fit falling, and is more likely to cause losses to personnel and property, with poor safety and economy. Summary of the Invention

[0004] The present invention provides a marine crankshaft shrink fit lifting platform with a self-locking function to solve at least one of the problems raised in the above background technique.

[0005] To solve the above technical problems, the present invention discloses a marine crankshaft shrink fit lifting platform with a self-locking function, including a bottom plate, on which a lifting box is provided, a lifting rod is installed on the lifting box, the upper end of the lifting rod is provided with a top plate, several slings are provided on the lower surface of the top plate, the lower end of the sling is provided with a lifting mechanism for lifting the crankshaft shrink fit, a self-locking component is also provided on the lifting box for restricting the movement of the lifting rod, and a limiting component is also provided on the lifting rod for restricting the swinging of the sling.

[0006] Preferably, a driving motor is fixedly provided on the inner wall of the lower side of the lifting box, the upper output end of the driving motor is fixedly connected with a threaded rod, a moving plate is threadedly connected to the threaded rod, the moving plate is slidably connected to the inner wall of the lifting box, a lifting rod is provided on the moving plate, the lifting rod slides upward and extends out of the lifting box, a cavity is provided inside the lifting rod, the threaded rod extends into the cavity, and the upper end of the threaded rod is fixedly connected with a rotating plate, and the rotating plate is slidably connected to the cavity.

[0007] Preferably, the self-locking component includes symmetrically arranged moving rods on the left and right. Through grooves are opened on the left and right side walls of the lifting box, the moving plate extends out of the lifting box from the through grooves, the moving plate is fixedly connected with the moving rods, and several triangular blocks are fixedly provided on the moving rods.

[0008] Preferably, U-shaped plates I are fixedly arranged on the left and right side walls of the lifting box. A plurality of through grooves are formed in the U-shaped plates I. Self-locking rods are slidably arranged in the through grooves. Discs are fixedly arranged on the front and rear sides of the self-locking rods. A first spring is also fixedly arranged in the through grooves. The first spring is fixedly connected to the self-locking rods. The self-locking rods are matched with the triangular blocks.

[0009] Preferably, a collar is slidably arranged on the lifting rod. The upper end of the collar is fixedly connected with a moving ring. Limiting components are symmetrically arranged on the moving ring. A first positioning hole is formed in the collar. A second positioning hole is formed in the lifting rod.

[0010] Preferably, the limiting component includes a special-shaped fixing block. The special-shaped fixing block is fixedly connected with the moving ring. The other end of the special-shaped fixing block is fixedly connected with a U-shaped plate II. A connecting rod is arranged in the U-shaped plate II. A buffer rod is slidably arranged on the connecting rod. Second springs are symmetrically and fixedly arranged on the buffer rod. The second springs are sleeved on the connecting rod;

[0011] The other end of the buffer rod is fixedly connected with a U-shaped frame. A buffer plate is slidably arranged in the U-shaped frame. A guide rod is slidably and penetratingly arranged on the buffer plate. The guide rod is fixedly connected with the U-shaped frame. A third spring is sleeved on the guide rod. One end of the third spring is fixedly connected with the buffer plate. The other end of the third spring is fixedly connected with the U-shaped frame.

[0012] Preferably, extending plates are symmetrically and fixedly arranged on the U-shaped frame. Rotating blocks are rotatably arranged on the sides of the extending plates close to each other. Fixing rods are symmetrically and fixedly arranged on the rotating blocks. Rotating wheels are rotatably installed on the fixing rods. The rotating wheels are in contact with the buffer plate.

[0013] Preferably, a bidirectional threaded rod is rotatably and penetratingly arranged at the eccentric position of the rotating block. The two ends of the bidirectional threaded rod are rotatably connected with a U-shaped plate III. L-shaped moving blocks are symmetrically and threadedly connected to the bidirectional threaded rod. A sliding groove is formed in the U-shaped plate III. The L-shaped moving blocks slide out of the U-shaped plate III from the sliding groove. Connecting rods are fixedly arranged on the sides of the L-shaped moving blocks close to each other. Arc-shaped plates are fixedly arranged on the connecting rods. A plugging block is fixed on one of the arc-shaped plates. A plugging groove is formed in the other arc-shaped plate. The plugging block is matched with the plugging groove.

[0014] Preferably, a through groove is formed in the front side of the U-shaped plate II. A moving box is slidably arranged in the through groove. The front side of the connecting rod is fixedly connected with the moving box. A sliding plate is fixedly arranged on the rear side of the connecting rod. The sliding plate is slidably connected with the U-shaped plate II. The front second spring is fixedly connected with the moving box. The rear second spring is fixedly connected with the sliding plate;

[0015] A positioning plate is fixedly connected to the front side of the moving box. Positioning rods are symmetrically and slidably and penetratingly arranged on the positioning plate. A plurality of left-right symmetric two-column positioning holes are formed in the front side of the U-shaped plate II. The positioning rods are matched with the positioning holes.

[0016] Preferably, a driving plate is arranged on the front side of the positioning plate. A driving rod is fixedly arranged on the driving plate. The driving rod slidably extends into the moving box. A resilient plate is slidably arranged in the moving box. The resilient plate is fixedly connected to the driving rod. A fourth spring is sleeved on the driving rod. One end of the fourth spring is fixedly connected to the resilient plate, and the other end of the fourth spring is fixedly connected to the moving box. The positioning rod is fixedly connected to the driving plate.

[0017] Compared with the prior art, the present invention provides a marine crankshaft shrink-fit lifting platform with a self-locking function. By setting a self-locking component and a limiting component, when the crankshaft shrink-fit is being hoisted and adjusted, if an abnormal situation occurs, the self-locking component can quickly lock the lifting rod to prevent the top plate from falling, effectively avoiding the risk of structural damage caused by the crankshaft shrink-fit hitting the ground. The limiting component effectively suppresses the swing of the sling, ensuring the stable hoisting of the crankshaft shrink-fit, which can effectively reduce the dropping probability of the crankshaft shrink-fit, greatly improve the operation safety of the equipment, and at the same time reduce the economic loss caused by workpiece damage, with stronger safety and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

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

[0020] Figure 2 is an internal structural schematic diagram of the lifting box of the present invention;

[0021] Figure 3 is a structural schematic diagram of the first U-shaped plate of the present invention;

[0022] Figure 4 is a schematic diagram of the sliding fit between the collar and the lifting rod of the present invention;

[0023] Figure 5 is a structural schematic diagram of the limiting component of the present invention;

[0024] Figure 6 is a structural schematic diagram of the U-shaped frame of the present invention;

[0025] Figure 7 is a front view of the second U-shaped plate of the present invention;

[0026] Figure 8 is a connection schematic diagram between the positioning plate and the inside of the moving box of the present invention.

[0027] In the figure: 1, bottom plate; 2, collar; 3, crankshaft shrink fit; 4, lifting box; 5, limit component; 6, moving ring; 7, lifting rod; 8, top plate; 9, sling; 10, hoisting mechanism; 11, driving motor; 12, moving plate; 13, triangular block; 14, disc; 15, threaded rod; 16, rotating plate; 17, U-shaped plate I; 18, spring I; 19, moving rod; 20, self-locking rod; 21, positioning hole I; 22, positioning hole II; 23, special-shaped fixing block; 24, connecting rod; 25, through groove; 26, runner; 27, rotating block; 28, U-shaped plate III; 29, L-shaped moving block; 30, connecting rod; 31, plugging block; 32, arc plate; 33, bidirectional threaded rod; 34, runner; 35, extending plate; 36, fixed rod; 37, buffer plate; 38, U-shaped frame; 39, buffer rod; 40, spring II; 41, U-shaped plate II; 42, spring III; 43, guiding rod; 44, positioning hole; 45, positioning plate; 46, driving plate; 47, driving rod; 48, positioning rod; 49, spring IV; 50, rebounding plate; 51, moving box. Detailed implementation manner

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "provided with", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0031] Embodiment 1

[0032] An embodiment of the present invention provides a marine crankshaft shrink fit lifting platform with a self-locking function, as Figures 1 - 8 shown, including a bottom plate 1, on which a lifting box 4 is arranged, a lifting rod 7 is installed on the lifting box 4, a top plate 8 is arranged at the upper end of the lifting rod 7, several suspension ropes 9 are arranged on the lower surface of the top plate 8, a hoisting mechanism 10 is arranged at the lower end of the suspension rope 9, the hoisting mechanism 10 is used for hoisting the crankshaft shrink fit 3, a self-locking assembly is also arranged on the lifting box 4, the self-locking assembly is used to limit the movement of the lifting rod 7, and a limiting assembly 5 is also arranged on the lifting rod 7, the limiting assembly 5 is used to limit the swing of the suspension rope 9.

[0033] The working principle and beneficial effects of the above technical solution are as follows: The crankshaft shrink fit 3 is installed on the hoisting mechanism 10, and the lifting box 4 drives the lifting rod 7 to move, realizing the lifting of the top plate 8 and the suspension rope 9 to complete the hoisting;

[0034] By setting the self-locking assembly and the limiting assembly 5, when the crankshaft shrink fit 3 is being hoisted and adjusted, if an abnormal situation occurs, the self-locking assembly can quickly lock the lifting rod 7 to prevent the top plate 8 from falling, effectively avoiding the risk of structural damage caused by the crankshaft shrink fit 3 hitting the ground; the limiting assembly 5 effectively suppresses the swing of the suspension rope 9 to ensure the stable hoisting of the crankshaft shrink fit 3, which can effectively reduce the dropping probability of the crankshaft shrink fit 3, greatly improve the operation safety of the equipment, and at the same time reduce the economic loss caused by workpiece damage, with stronger safety and economy.

[0035] Embodiment 2

[0036] On the basis of the above Embodiment 1, as Figures 1 - 2 shown, a driving motor 11 is fixedly arranged on the inner wall of the lower side of the lifting box 4, the upper output end of the driving motor 11 is fixedly connected with a threaded rod 15, a moving plate 12 is threadedly connected to the threaded rod 15, the moving plate 12 is slidably connected to the inner wall of the lifting box 4, the lifting rod 7 is arranged on the moving plate 12, the lifting rod 7 extends upward and slides out of the lifting box 4, a cavity is arranged inside the lifting rod 7, the threaded rod 15 extends into the cavity, the upper end of the threaded rod 15 is fixedly connected with a rotating plate 16, and the rotating plate 16 is slidably connected to the cavity.

[0037] The working principle and beneficial effects of the above technical solution are as follows: The driving motor 11 drives the threaded rod 15 to rotate, and the threaded rod 15 drives the moving plate 12 to move vertically up and down along the inner wall of the lifting box 4. When the moving plate 12 moves upward, it pushes the lifting rod 7 to slide upward together, so that it extends out of the lifting box 4, driving the top plate 8, the suspension rope 9 and the hoisting mechanism 10 to rise, realizing the lifting of the crankshaft shrink fit; By adopting the method of driving the threaded rod 15 to rotate by the driving motor 11 and driving the moving plate 12 to move, the accuracy and stability of lifting are stronger, and it is not easy to slip, with higher practicability.

[0038] Embodiment 3

[0039] On the basis of the above-mentioned Embodiment 2, as Figures 2 - 3 shown, the self-locking assembly includes symmetrically arranged moving rods 19 on the left and right. Through grooves are formed on the left and right side walls of the lifting box 4. The moving plate 12 extends out of the lifting box 4 from the through grooves. The moving plate 12 is fixedly connected to the moving rods 19, and a number of triangular blocks 13 are fixedly arranged on the moving rods 19.

[0040] Among them, preferably, U-shaped plates 17 are also fixedly arranged on the left and right side walls of the lifting box 4. A number of through grooves are formed on the U-shaped plates 17. Self-locking rods 20 are slidably arranged in the through grooves. Discs 14 are fixedly arranged on the front and rear sides of the self-locking rods 20. A first spring 18 is also fixedly arranged in the through grooves. The first spring 18 is fixedly connected to the self-locking rods 20. The self-locking rods 20 cooperate with the triangular blocks 13.

[0041] The working principle and beneficial effects of the above technical solution are as follows: The moving plate 12 slides up and down in the lifting box 4 through the through grooves, driving the moving rods 19 to move synchronously. At this time, a number of triangular blocks 13 move with the moving rods 19. Under the initial tension of the first spring 18, the upper end of the self-locking rod 20 remains in contact with the inclined surface of the triangular block 13, and the lifting rod 7 can freely move up and down;

[0042] When an abnormal situation occurs, the moving plate 12 suddenly drops due to the gravity of the crankshaft red sleeve 3 and the top plate 8, driving the moving rods 19 to move downward rapidly. The right-angled surfaces of the triangular blocks 13 on the moving rods 19 will contact the self-locking rods 20, and the self-locking rods 20 will move to the lowest position. Under the limiting action of the through grooves, the movement of the moving rods 19 is restricted, forming a mechanical lock to prevent the top plate 8 from falling; The mechanical lock realizes self-locking through gravity drive, which is more reliable than the electric control self-locking. Moreover, there are no complex hydraulic components or electronic sensors, the number of parts is small and not easy to wear, the maintenance period is long, the maintenance cost is low, and it cooperates with the movement of the moving plate 12 controlled by the thread, further reducing the falling risk.

[0043] Embodiment 4

[0044] On the basis of Embodiment 1, as Figure 1 and Figure 4 shown, a collar 2 is slidably arranged on the lifting rod 7. A moving ring 6 is fixedly connected to the upper end of the collar 2. A limiting assembly 5 is symmetrically arranged on the moving ring 6. A first positioning hole 21 is formed on the collar 2, and a second positioning hole 22 is formed on the lifting rod 7.

[0045] The working principle and beneficial effects of the above technical solution are as follows: The collar 2 can slide up and down along the lifting rod 7, driving the moving ring 6 and the limiting component 5 to move synchronously; positioning pins can be inserted into the first positioning hole 21 and the second positioning hole 22, so as to adjust the installation height of the limiting component 5 on the lifting rod 7. The height of the limiting component 5 can be adjusted with the collar 2, which can adapt to slings 9 of different lengths, ensuring that the limiting point always acts on the effective position of the sling 9, and improving the accuracy and safety.

[0046] Embodiment 5[[ID=^]]

[0047] On the basis of the above Embodiment 4, as Figures 5 - 6 shown, the limiting component 5 includes a special-shaped fixing block 23, the special-shaped fixing block 23 is fixedly connected to the moving ring 6, the other end of the special-shaped fixing block 23 is fixedly connected to a second U-shaped plate 41, a connecting rod 24 is arranged in the second U-shaped plate 41, a buffer rod 39 is slidably arranged on the connecting rod 24, two springs 40 are symmetrically and fixedly arranged on the buffer rod 39, and the springs 40 are sleeved on the connecting rod 24;

[0048] The other end of the buffer rod 39 is fixedly connected to a U-shaped frame 38, a buffer plate 37 is slidably arranged in the U-shaped frame 38, a guide rod 43 is slidably penetrated through the buffer plate 37, the guide rod 43 is fixedly connected to the U-shaped frame 38, and a third spring 42 is sleeved on the guide rod 43. One end of the third spring 42 is fixedly connected to the buffer plate 37, and the other end of the third spring 42 is fixedly connected to the U-shaped frame 38.

[0049] Among them, preferably, extending plates 35 are symmetrically and fixedly arranged on the U-shaped frame 38. Rotating blocks 27 are rotatably arranged on the sides of the extending plates 35 close to each other. Fixing rods 36 are symmetrically and fixedly arranged on the rotating blocks 27. Rotating wheels 26 are rotatably installed on the fixing rods 36, and the rotating wheels 26 are in contact with the buffer plate 37.

[0050] Among them, preferably, a bidirectional threaded rod 33 is rotatably penetrated through the eccentric position of the rotating block 27. The two ends of the bidirectional threaded rod 33 are rotatably connected to a third U-shaped plate 28. L-shaped moving blocks 29 are symmetrically and threadedly connected to the bidirectional threaded rod 33. Chute grooves are formed on the third U-shaped plate 28. The L-shaped moving blocks 29 slide out of the third U-shaped plate 28 from the chute grooves. Connecting rods 30 are fixedly arranged on the sides of the L-shaped moving blocks 29 close to each other. Arc-shaped plates 32 are fixedly arranged on the connecting rods 30. A plugging block 31 is fixed on one of the arc-shaped plates 32, and a plugging groove is formed on the other arc-shaped plate 32. The plugging block 31 is matched with the plugging groove.

[0051] Among them, the front side of the bidirectional threaded rod 33 rotatably extends out of the third U-shaped plate 28, and a rotating wheel 34 is fixedly connected to the front side of the bidirectional threaded rod 33.

[0052] The working principle and beneficial effects of the above technical solution are as follows: By rotating the rotating wheel 34, the rotating wheel 34 drives the bidirectional threaded rod 33 to rotate. Two L-shaped moving blocks 29 will move towards each other along the sliding grooves of the U-shaped plate three 28. The L-shaped moving blocks 29 drive the connecting rod 30 and the arc-shaped plate 32 to move. Through the cooperation of the plugging block 31 and the plugging groove, the two arc-shaped plates 32 can closely fit sling 9 with different diameters, realizing the clamping of sling 9; When sling 9 swings, sling 9 will drive the rotating block 27 to rotate. The rotating block 27 drives one of the rotating wheels 26 to contact the buffer plate 37, and the spring three 42 is compressed or stretched. The kinetic energy generated by the swing of sling 9 is absorbed through elastic deformation, slowing down the swing amplitude. At the same time, the force will be transmitted to the buffer rod 39 through the U-shaped frame 38. The buffer rod 39 slides on the connecting rod 24, driving the spring two 40 to work together, further enhancing the buffering effect;

[0053] Through the dual spring buffer structure (spring two 40, spring three 42) cooperating with the buffer plate 37 and the buffer rod 39, the energy of the swing of sling 9 can be quickly absorbed, further reducing the risk of the dropping of the crankshaft shrink fit 3 and improving the stability during the hoisting process; By driving the opening and closing of the arc-shaped plate 32 through the bidirectional threaded rod 33, sling 9 with different diameters can be adapted, and the adaptability is stronger.

[0054] Embodiment 6

[0055] Based on the above Embodiment 5, as Figures 7 - 8 shown, a through groove 25 is opened on the front side of the U-shaped plate two 41. A moving box 51 is slidably arranged in the through groove 25. The front side of the connecting rod 24 is fixedly connected to the moving box 51. A sliding plate is fixedly arranged on the rear side of the connecting rod 24. The sliding plate is slidably connected to the U-shaped plate two 41. The front spring two 40 is fixedly connected to the moving box 51. The rear spring two 40 is fixedly connected to the sliding plate;

[0056] A positioning plate 45 is fixedly connected to the front side of the moving box 51. Positioning rods 48 are symmetrically and slidably penetrated through the positioning plate 45. A number of left-right symmetric two-column positioning holes 44 are opened on the front side of the U-shaped plate two 41. The positioning rods 48 are matched with the positioning holes 44.

[0057] Among them, preferably, a driving plate 46 is arranged on the front side of the positioning plate 45. A driving rod 47 is fixedly arranged on the driving plate 46. The driving rod 47 slidably extends into the moving box 51. A resilient plate 50 is slidably arranged in the moving box 51. The resilient plate 50 is fixedly connected to the driving rod 47. A spring four 49 is sleeved on the driving rod 47. One end of the spring four 49 is fixedly connected to the resilient plate 50. The other end of the spring four 49 is fixedly connected to the moving box 51. The positioning rod 48 is fixedly connected to the driving plate 46.

[0058] The working principle and beneficial effects of the above technical solution are as follows: Pull the driving plate 46 forward, the driving plate 46 drives the positioning rod 48 to leave the positioning hole 44, then move the driving plate 46 up or down, the driving plate 46 drives the moving box 51 to move, and the moving box 51 drives the connecting rod 24 to move, so that the contact position between the arc plate 32 and the sling 9 can be adjusted; then release the driving plate 46, and under the action of the fourth spring 49, the positioning rod 48 will re-insert into different positioning holes 44, thereby completing the position adjustment of the arc plate 32;

[0059] By moving the driving plate 46 and the moving ring 6, the position of the arc plate 32 can be adjusted within the full height range of the lifting rod 7, adapting to various sling lengths, so that the limiting point always acts on the "golden position" where the sling 9 swings most violently (such as the upper middle part of the long sling and the lower end of the short sling), with good limiting effect and stronger practicability.

[0060] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms.

Claims

1. A marine crankshaft shrink fit lifting platform with a self-locking function, characterized in that, It includes a bottom plate (1), on which a lifting box (4) is arranged. A lifting rod (7) is installed on the lifting box (4). The upper end of the lifting rod (7) is provided with a top plate (8). A number of suspension cables (9) are arranged on the lower surface of the top plate (8). The lower end of the suspension cable (9) is provided with a hoisting mechanism (10), and the hoisting mechanism (10) is used for hoisting the crankshaft shrink fit (3). A self-locking component is also arranged on the lifting box (4), and the self-locking component is used to limit the movement of the lifting rod (7). A limiting component (5) is also arranged on the lifting rod (7), and the limiting component (5) is used to limit the swing of the suspension cable (9).

2. The marine crankshaft shrink-fit lifting platform with a self-locking function according to claim 1, wherein, A driving motor (11) is fixedly arranged on the inner wall of the lower side of the lifting box (4). The upper output end of the driving motor (11) is fixedly connected with a threaded rod (15). A moving plate (12) is threadedly connected to the threaded rod (15). The moving plate (12) is slidably connected to the inner wall of the lifting box (4). A lifting rod (7) is arranged on the moving plate (12). The lifting rod (7) slides upward and extends out of the lifting box (4). A cavity is arranged inside the lifting rod (7). The threaded rod (15) extends into the cavity. The upper end of the threaded rod (15) is fixedly connected with a rotating plate (16), and the rotating plate (16) is slidably connected to the cavity.

3. The marine crankshaft shrink-fit lifting platform with a self-locking function according to claim 2, wherein, The self-locking component includes symmetrically arranged moving rods (19) on the left and right. Through grooves are formed on the left and right side walls of the lifting box (4). The moving plate (12) extends out of the lifting box (4) from the through grooves. The moving plate (12) is fixedly connected with the moving rod (19). A number of triangular blocks (13) are fixedly arranged on the moving rod (19).

4. A marine crankshaft shrink-fit lifting platform with a self-locking function according to claim 3, characterized in that, U-shaped plates one (17) are also fixedly arranged on the left and right side walls of the lifting box (4). A number of through slots are formed on the U-shaped plates one (17). A self-locking rod (20) is slidably arranged in the through slots. Disks (14) are fixedly arranged on the front and rear sides of the self-locking rod (20). A spring one (18) is also fixedly arranged in the through slots. The spring one (18) is fixedly connected with the self-locking rod (20). The self-locking rod (20) cooperates with the triangular block (13).

5. A marine crankshaft shrink fit lifting platform with a self-locking function according to claim 1, characterized in that, A collar (2) is slidably arranged on the lifting rod (7). The upper end of the collar (2) is fixedly connected with a moving ring (6). Limiting components (5) are symmetrically arranged on the moving ring (6). A positioning hole one (21) is formed on the collar (2), and a positioning hole two (22) is formed on the lifting rod (7).

6. A marine crankshaft shrink-fit lifting platform with a self-locking function according to claim 5, characterized in that, The limiting component (5) includes a special-shaped fixing block (23). The special-shaped fixing block (23) is fixedly connected with the moving ring (6). The other end of the special-shaped fixing block (23) is fixedly connected with a U-shaped plate two (41). A connecting rod (24) is arranged inside the U-shaped plate two (41). A buffer rod (39) is slidably arranged on the connecting rod (24). Spring two (40) are symmetrically and fixedly arranged on the buffer rod (39). The spring two (40) is sleeved on the connecting rod (24); The other end of the buffer rod (39) is fixedly connected with a U-shaped frame (38). A buffer plate (37) is slidably arranged in the U-shaped frame (38). A guide rod (43) is slidably penetrated through the buffer plate (37). The guide rod (43) is fixedly connected with the U-shaped frame (38). A third spring (42) is sleeved on the guide rod (43). One end of the third spring (42) is fixedly connected with the buffer plate (37), and the other end of the third spring (42) is fixedly connected with the U-shaped frame (38).

7. A marine crankshaft shrink-fit lifting platform with a self-locking function according to claim 6, characterized in that, On the U-shaped frame (38), extension plates (35) are symmetrically and fixedly arranged. Rotating blocks (27) are rotatably arranged on the sides of the extension plates (35) close to each other. Fixed rods (36) are symmetrically and fixedly arranged on the rotating blocks (27). Rotating wheels (26) are rotatably installed on the fixed rods (36). The rotating wheels (26) are in contact with the buffer plate (37).

8. A marine crankshaft shrink fit lifting platform with a self-locking function according to claim 7, characterized in that, A bidirectional threaded rod (33) is rotatably penetrated through the eccentric position of the rotating block (27). The two ends of the bidirectional threaded rod (33) are rotatably connected with a third U-shaped plate (28). Symmetrically threaded L-shaped moving blocks (29) are connected to the bidirectional threaded rod (33). A sliding groove is formed on the third U-shaped plate (28). The L-shaped moving blocks (29) slide out of the third U-shaped plate (28) from the sliding groove. Connecting rods (30) are fixedly arranged on the sides of the L-shaped moving blocks (29) close to each other. Arc-shaped plates (32) are fixedly arranged on the connecting rods (30). A plug-in block (31) is fixed on one of the arc-shaped plates (32), and a plug-in groove is formed on the other arc-shaped plate (32). The plug-in block (31) is matched with the plug-in groove.

9. A marine crankshaft shrink-fit lifting platform with a self-locking function according to claim 6, characterized in that, A through groove (25) is formed on the front side of the second U-shaped plate (41). A moving box (51) is slidably arranged in the through groove (25). The front side of the connecting rod (24) is fixedly connected with the moving box (51). A sliding plate is fixedly arranged on the rear side of the connecting rod (24). The sliding plate is slidably connected with the second U-shaped plate (41). The front second spring (40) is fixedly connected with the moving box (51), and the rear second spring (40) is fixedly connected with the sliding plate; A positioning plate (45) is fixedly connected to the front side of the moving box (51). Positioning rods (48) are symmetrically and slidably penetrated through the positioning plate (45). A number of left-right symmetrically arranged two columns of positioning holes (44) are formed on the front side of the second U-shaped plate (41). The positioning rods (48) are matched with the positioning holes (44).

10. A marine crankshaft shrink-fit lifting platform with a self-locking function according to claim 9, characterized in that, A driving plate (46) is arranged on the front side of the positioning plate (45). A driving rod (47) is fixedly arranged on the driving plate (46). The driving rod (47) slidably extends into the moving box (51). A resilient plate (50) is slidably arranged in the moving box (51). The resilient plate (50) is fixedly connected with the driving rod (47). A fourth spring (49) is sleeved on the driving rod (47). One end of the fourth spring (49) is fixedly connected with the resilient plate (50), and the other end of the fourth spring (49) is fixedly connected with the moving box (51). The positioning rod (48) is fixedly connected with the driving plate (46).

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