A marine main engine hoisting platform device with displacement compensation mechanism

Abstract

This invention provides a marine main engine lifting platform device with a displacement compensation mechanism. The lifting platform structure includes a top mounting platform, a center alignment platform, a bottom fixed platform, a displacement compensation drive group, and a sensing group. The bottom side of the center alignment platform has an arc-shaped spherical protrusion to cooperate with the bottom fixed platform. The sensing group includes four sets of inserts that are radially inserted into the center alignment platform. A pressure sensor is located between the inserts and the center alignment platform. The pressure sensor detects the bearing pressure in the corresponding area of ​​the upper part of the top mounting platform, ensuring that the pressure values ​​detected by the two sets of pressure sensors symmetrical about the center alignment platform are the same. This invention can automatically compensate for unbalanced displacement after the main engine equipment is loaded onto the lifting platform, achieving uniform force distribution on the lifting ropes around the platform, thereby improving lifting stability and extending the equipment's service life.

Description

Technical Field

[0001] This invention relates to a lifting platform structure, and more particularly to a marine main engine lifting platform device with a displacement compensation mechanism. Background Technology

[0002] Lifting is generally suitable for the overall transportation of large equipment such as marine main engines, eliminating the need for disassembly and relocation, thus greatly saving time and labor costs. The marine main engine lifting platform is an important structure used to support and fix the marine main engine. It needs to have sufficient strength and stability to withstand the weight of the main engine and the vibration generated during operation, as shown in the patent for an auxiliary tool for lifting large components of a ship lift main engine (publication number CN210973050U). However, existing lifting platforms are generally only used to provide installation and support, without the function of aligning the equipment to the center of the lifting platform. The position of the equipment on the lifting platform can only be roughly estimated manually. Therefore, when lifting equipment with lifting ropes, the lifting force on one side is often too large, causing it to tilt to one side or the surrounding lifting ropes to be unevenly stressed, resulting in poor stability of the lifting equipment. At the same time, it will also greatly reduce the service life of the lifting equipment, and the wear rate of the lifting equipment will increase with long-term use. Summary of the Invention

[0003] To address the aforementioned technical problems, the present invention aims to provide a marine main engine lifting platform device with a displacement compensation mechanism. This device can automatically compensate for unbalanced displacements after the main engine equipment is loaded onto the lifting platform, thereby achieving uniform force distribution on the lifting ropes around the platform and improving lifting stability and equipment lifespan.

[0004] This invention provides the following technical solution: A marine main engine hoisting platform device with a displacement compensation mechanism includes a top mounting platform, a center alignment platform, a bottom fixing platform, a displacement compensation drive group, and a sensing group. The top horizontal surface of the top mounting platform is used for positioning and installing the marine main engine. The marine main engine can be secured directly to the bottom mounting screws or secured to the top horizontal surface of the top mounting platform by means of other protective railings around the marine main engine. The installation method is existing technology and will not be described in detail here. The bottom horizontal surface of the top mounting platform is placed on the center alignment platform and is driven and connected to the center alignment platform through the displacement compensation drive group. The bottom side of the center alignment platform has an arc-shaped spherical protrusion. The top center of the bottom fixing platform has a groove that mates with the protrusion and is also arc-shaped spherical. The sensing group includes four sensors evenly distributed along the circumference of the center alignment platform. The system includes a set of insert blocks, one end of which is fixed to a bottom fixed platform. The center correction platform has four sets of slots corresponding to the insert blocks in its circumferential direction. There is a buffer gap filled with a buffer pad between the horizontal top side of the insert block inserted into the slot and the slot, and there is an installation gap between the horizontal bottom side of the insert block inserted into the slot and the slot, which is spaced apart by pressure sensors. The pressure sensors are used to detect the bearing pressure of the corresponding end area of ​​the upper part of the top mounting platform. When the pressure value detected by the pressure sensor at one end is greater than the pressure value detected by the pressure sensor on the opposite side, the displacement compensation drive group is activated to drive the top mounting platform to move towards the end with the larger pressure value. This continues until the pressure values ​​detected by any two sets of pressure sensors symmetrical about the center correction platform are the same, at which point the marine main engine above the top mounting platform is corrected to the center position of the platform. In practical use, the marine main engine can be manually moved to the top mounting platform for initial rough centering and positioning. Then, personnel exit the platform, and the pressure sensors are activated, along with the displacement compensation drive unit. After receiving pressure values ​​from the four pressure sensors, the controller compares the values ​​from the opposite pressure sensors. It then controls the displacement compensation drive unit to move the top mounting platform and the main engine towards the side with the higher pressure value. This continues until the pressure difference between the two sets of sensors is within the error range. At this point, the displacement compensation drive unit is deactivated, ensuring the main engine is centered on the calibration platform. Since the center alignment platform is located at the center of the bottom fixed platform, the marine main engine is also located at the center of the bottom fixed platform. Therefore, when suspending the bottom fixed platform later, it can be ensured that the tension of each set of lifting ropes located around the bottom fixed platform is similar. At this time, the weight of the marine main engine can be evenly distributed to each set of lifting ropes, thereby ensuring that the lifting equipment above each set of lifting ropes can apply force evenly. This not only avoids tilting to one side, but also avoids the problem of poor stability of the lifting equipment due to uneven force on the surrounding lifting ropes. This also improves the service life of the lifting equipment and reduces the possible wear rate of a single set or one side when using the lifting equipment for a long time.

[0005] Preferably, the protrusion and the groove are connected by a ball bearing, which can replace the tendency of sliding friction when there is an imbalance between the center correction platform and the bottom fixed platform with the tendency of rolling friction, thereby improving the accuracy of correction.

[0006] Preferably, the groove is an arc-shaped spherical unit that can be detachably connected to the bottom fixed platform. This detachable method can be directly secured with screws, so that the local contact surface structure can be quickly replaced during subsequent maintenance, and the flexibility is also better.

[0007] Preferably, the bottom side of the insert block is provided with a horizontal T-shaped guide block, and the T-shaped guide block is horizontally guided and connected to the T-shaped guide groove opened at the top of the arc-shaped spherical unit and the bottom fixed platform. The insert block is a right-angled insert block, and the vertical right-angle end of the insert block is also provided with a through hole. The insert block and the bottom fixed platform are locked together by bolts passing through the through hole. Therefore, since the through hole is opened on the periphery end side, it is also convenient for subsequent disassembly. At the same time, the T-shaped guide block and the T-shaped guide groove can also realize the quick position locking of the arc-shaped spherical unit and the bottom fixed platform, and the subsequent disassembly will also be more convenient. When the insert block is removed, the arc-shaped spherical unit and the bottom fixed platform can also be separated at the same time.

[0008] Preferably, the horizontal top side of the central calibration platform is further provided with multiple sets of ball bearing units distributed circumferentially. Each ball bearing unit includes a top block, a second ball bearing, and a top cylinder. The top block is placed in a top groove opened on the top side of the central calibration platform. The top cylinder is placed in the top groove and is used to drive the top block to move up and down and reciprocate along the top groove. The horizontal top side of the top block is also provided with multiple sets of second balls bearing. When the second balls bearing on the top block protrude from the horizontal top side of the central calibration platform, they are used to support the top mounting platform to move up. At this time, when the displacement compensation drive group drives the top mounting platform to adjust its position in the X or Y direction, the bottom side of the top mounting platform can change from sliding friction to rolling friction with the second balls bearing, thereby making the calibration more time-saving and labor-saving.

[0009] Preferably, the center of the top side of the center correction platform has a mounting groove. The displacement compensation drive group includes an X-axis slider slidably mounted in the mounting groove, a Y-axis slider slidably mounted on the X-axis slide plate, an X-axis lead screw mounted in the mounting groove for driving the X-axis slider to slide in the X direction, and a Y-axis lead screw mounted on the X-axis slider for driving the Y-axis slider to slide in the Y direction. The ends of the X-axis and Y-axis lead screws are connected to the corresponding lead screw motors for drive. Four sets of plugs are also located at the corresponding X-axis and Y-axis ends. The bottom side of the top mounting platform also has a guide hole for guiding the Y-axis slider. Therefore, when the pressure sensor at one end of the X-axis detects that the pressure is greater than the pressure value at the other end, the X-axis lead screw rotates, driving the X-axis slider to move the upper structure towards the end with the greater pressure value through threaded engagement. Similarly, when the pressure sensor at one end of the Y-axis detects that the pressure is greater than the pressure value at the other end, the Y-axis lead screw rotates, driving the Y-axis slider to move the upper structure towards the end with the greater pressure value through threaded engagement. Adjustment is relatively convenient.

[0010] Preferably, multiple sets of horizontal locking cylinders are also provided on the periphery of the guide hole. The driving end of the horizontal locking cylinder is connected to a horizontal locking rod. The periphery of the Y-axis slider extending into the guide hole is provided with a horizontal locking groove. When the top mounting platform is horizontally pressed onto the center correction platform, the horizontal locking rod is driven by the corresponding horizontal locking cylinder to extend into the horizontal locking groove to lock the top mounting platform horizontally. When the top mounting platform is mounted on the ball bearing support, the horizontal locking rod is driven by the corresponding horizontal locking cylinder to disengage from the horizontal locking groove. This ensures that the top mounting platform can be easily corrected and adjusted, and can also provide stable support after adjustment.

[0011] Preferably, multiple sets of lifting rings for connecting lifting wire ropes are evenly fixed around the periphery of the bottom mounting platform.

[0012] The beneficial effects of this invention are as follows: This invention provides a marine main engine hoisting platform device with a displacement compensation mechanism. After the main engine is loaded onto the hoisting platform, it can automatically compensate for unbalanced displacement, achieving uniform force distribution on the hoisting ropes around the platform, thereby improving hoisting stability and equipment lifespan. In actual use, the marine main engine can be manually moved to the top mounting platform for initial rough center observation and positioning. Then, personnel exit the top mounting platform, and the pressure sensors are activated, along with the displacement compensation drive group. After receiving the pressure values ​​detected by the four pressure sensors, the controller compares the pressure values ​​from the opposite pressure sensors and then controls the displacement compensation drive group to move the top mounting platform and the marine main engine towards the end with the higher pressure value until the two pressure values ​​are balanced. When the pressure difference detected by the force sensor is within the error range, the displacement compensation drive group is turned off. This ensures that the marine main engine is centered on the center alignment platform. Since the center alignment platform is centered on the bottom fixed platform, the marine main engine is also centered on the bottom fixed platform. Therefore, when suspending the bottom fixed platform later, it can be ensured that the tension of each set of lifting ropes on the periphery of the bottom fixed platform is similar. At this time, the weight of the marine main engine can be evenly distributed on each set of lifting ropes, thereby ensuring that the lifting equipment above each set of lifting ropes can apply force evenly. This not only avoids tilting to one side, but also avoids the problem of poor stability of the lifting equipment due to uneven force on the surrounding lifting ropes. This also improves the service life of the lifting equipment and reduces the wear rate of a single set or one side that may occur when using the lifting equipment for a long time. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a front structural cross-sectional view of the top mounting platform of the ball bearing double support of the present invention, which is used for adjustment of the top mounting platform by the displacement compensation drive group. Figure 2 This is a front view sectional view of the top mounting platform after the displacement compensation drive group of the present invention has been adjusted. Figure 3 yes Figure 1 Top sectional view after removing the top mounting platform; Figure 4 This is a side view of the insert block; Markings in the diagram: 1. Top mounting platform; 2. Center alignment platform; 3. Bottom fixing platform; 4. Displacement compensation drive group; 5. Sensing group; 11. Guide hole; 12. Horizontal locking cylinder; 13. Horizontal locking rod; 21. Protrusion; 22. Ball bearing one; 23. Top block; 24. Ball bearing two; 25. Top cylinder; 26. Mounting groove; 31. Arc-shaped spherical unit; 32. Lifting ring; 41. X-axis slider; 42. Y-axis slider; 43. X-axis lead screw; 44. Y-axis lead screw; 45. Horizontal locking groove; 51. Insert block; 52. Buffer gap; 53. Pressure sensor; 54. T-shaped guide block; 55. Through hole. Detailed Implementation

[0014] Example 1 like Figure 1-4 As shown, a marine main engine hoisting platform device with a displacement compensation mechanism, in this embodiment, includes a top mounting platform 1, a center correction platform 2, a bottom fixing platform 3, a displacement compensation drive group 4, and a sensing group 5. The top horizontal surface of the top mounting platform 1 is used to position and install the marine main engine. The marine main engine can be secured directly to the bottom mounting screws, or secured to the top horizontal surface of the top mounting platform 1 by means of other protective railings around the marine main engine. The installation method is existing technology and will not be described in detail here. The bottom horizontal surface of the top mounting platform 1 is placed on the center correction platform 2 and is driven and connected to the center correction platform 2 through the displacement compensation drive group 4. The bottom side of the center correction platform 2 has an arc-shaped spherical protrusion 21. The top center of the bottom fixing platform 3 has a groove that matches the protrusion 21 and is also an arc-shaped spherical surface. The sensing group 5 includes four sensors evenly distributed along the circumference of the center correction platform 2. The insert block 51 is fixed at one end to the bottom fixed platform 3. The center correction platform 2 has four sets of slots corresponding to the insert block 51 in the circumferential direction. There is a buffer gap 52 filled with a buffer pad between the horizontal top side of the insert block 51 inserted into the slot and the slot. There is also an installation gap between the horizontal bottom side of the insert block 51 inserted into the slot and the slot, which is spaced apart by a pressure sensor 53. The pressure sensor 53 is used to detect the bearing pressure of the corresponding end area of ​​the upper layer of the top mounting platform 1. When the pressure value detected by the pressure sensor 53 at one end is greater than the pressure value detected by the pressure sensor 53 on the opposite side, the displacement compensation drive group 4 is activated to drive the top mounting platform 1 to move towards the end with the larger pressure value. When the pressure values ​​detected by any two sets of pressure sensors 53 that are symmetrical about the center of the center correction platform 2 are the same, the marine main engine above the top mounting platform 1 is corrected to the center position of the platform. In practical use, the marine main engine can be manually moved to the top mounting platform 1 for initial rough centering and positioning. Then, personnel exit the top mounting platform 1, activate the pressure sensor 53, and start the displacement compensation drive group 4. After receiving the pressure values ​​detected by the four pressure sensors 53, the controller compares the pressure values ​​of the opposite pressure sensors 53. It then controls the displacement compensation drive group 4 to move the top mounting platform 1 and the marine main engine towards the end with the higher pressure value until the pressure difference between the two sets of pressure sensors 53 is within the error range. At this point, the displacement compensation drive group 4 is turned off, ensuring the marine main engine is centered and aligned. Since the center alignment platform 2 is located at the center of the bottom fixed platform 3, the marine main engine is also located at the center of the bottom fixed platform 3. Therefore, when the bottom fixed platform 3 is suspended later, it can be ensured that the tension of each set of lifting ropes on the periphery of the bottom fixed platform 3 is similar. At this time, the weight of the marine main engine can be evenly distributed to each set of lifting ropes, thereby ensuring that the lifting equipment above each set of lifting ropes can apply force evenly. This not only avoids tilting to one side, but also avoids the problem of poor stability of the lifting equipment due to uneven force on the surrounding lifting ropes. This also improves the service life of the lifting equipment and reduces the possible wear rate of a single set or one side when the lifting equipment is used for a long time.

[0015] Example 2 In this embodiment, a marine main engine hoisting platform device with a displacement compensation mechanism is further defined based on embodiment 1. The protrusion 21 and the groove are abutted by a ball bearing 22, which can replace the tendency of sliding friction when there is an imbalance between the center correction platform 2 and the bottom fixed platform 3 with the tendency of rolling friction, thereby improving the accuracy of correction.

[0016] The groove is a detachable arc-shaped spherical unit 31 that is fixed to the bottom platform 3. This detachable method can be directly secured with screws, so the local contact surface structure can be quickly replaced during subsequent maintenance, and the flexibility is also better.

[0017] The bottom side of the insert 51 is provided with a horizontal T-shaped guide block 54, and the T-shaped guide block 54 is horizontally guided and connected to the T-shaped guide groove opened at the top of the arc-shaped spherical unit 31 and the bottom fixed platform 3. The insert 51 is a right-angled insert 51, and the vertical right-angle end of the insert 51 is also provided with a through hole 55. The insert 51 and the bottom fixed platform 3 are locked together by bolts passing through the through hole 55. Therefore, since the through hole 55 is opened on the periphery end side, it is also convenient for subsequent disassembly. At the same time, the T-shaped guide block 54 and the T-shaped guide groove can also realize the quick position locking of the arc-shaped spherical unit 31 and the bottom fixed platform 3, and the subsequent disassembly will also be more convenient. When the insert 51 is removed, the arc-shaped spherical unit 31 and the bottom fixed platform 3 can also be separated at the same time.

[0018] The horizontal top side of the central calibration platform 2 is also circumferentially distributed with multiple sets of ball bearing units. Each ball bearing unit includes a top block 23, a second ball bearing 24, and a top cylinder 25. The top block 23 is placed in a top groove opened on the top side of the central calibration platform 2. The top cylinder 25 is placed in the top groove and is used to drive the top block 23 to move up and down and reciprocate along the top groove. The horizontal top side of the top block 23 is also provided with multiple sets of second balls bearing 24. When the second balls bearing 24 on the top block 23 protrude from the horizontal top side of the central calibration platform 2, they are used to support the top mounting platform 1 to move upward. At this time, when the displacement compensation drive group 4 drives the top mounting platform 1 to adjust its position in the X or Y direction, the bottom side of the top mounting platform 1 can change from sliding friction to rolling friction with the second balls bearing 24, thereby making the calibration more time-saving and labor-saving.

[0019] The center correction platform 2 has a mounting groove 26 at its top center. The displacement compensation drive group 4 includes an X-axis slider 41 slidably mounted in the mounting groove 26, a Y-axis slider 42 slidably mounted on the X-axis slide plate, an X-axis lead screw 43 mounted in the mounting groove 26 for driving the X-axis slider 41 to slide in the X direction, and a Y-axis lead screw 44 mounted on the X-axis slider 41 for driving the Y-axis slider 42 to slide in the Y direction. The ends of the X-axis lead screw 43 and the Y-axis lead screw 44 are connected to the corresponding lead screw motors. Four sets of inserts 51 are also located at the corresponding X and Y ends. The bottom side of the top mounting platform 1 is also provided with a guide hole 11 for guiding the Y-axis slider 42. Therefore, when the pressure sensor 53 at one end of the X-axis detects that the pressure is greater than the pressure value at the other end, the X-axis screw 43 rotates and drives the X-axis slider 41 to move the upper structure toward the end with the greater pressure value through the threaded engagement. Similarly, when the pressure sensor 53 at one end of the Y-axis detects that the pressure is greater than the pressure value at the other end, the Y-axis screw 44 rotates and drives the Y-axis slider 42 to move the upper structure toward the end with the greater pressure value through the threaded engagement, making adjustment more convenient.

[0020] Multiple sets of horizontal locking cylinders 12 are also provided around the guide hole 11. The driving end of the horizontal locking cylinder 12 is connected to a horizontal locking rod 13. The Y-axis slider 42 extends into the guide hole 11 and is provided with a horizontal locking groove 45 around its periphery. When the top mounting platform 1 is horizontally pressed onto the center correction platform 2, the horizontal locking rod 13 is driven by the corresponding horizontal locking cylinder 12 to extend into the horizontal locking groove 45 to lock the top mounting platform 1 horizontally. When the ball bearing 24 supports the top mounting platform 1, the horizontal locking rod 13 is driven by the corresponding horizontal locking cylinder 12 to disengage from the horizontal locking groove 45. This ensures that the top mounting platform 1 can be easily corrected and adjusted, and can also be stably supported after adjustment.

[0021] The bottom mounting platform has multiple sets of lifting rings 32 evenly fixed around its periphery for connecting the lifting wire rope.

[0022] The working principle of this invention is as follows: This invention provides a marine main engine hoisting platform device with a displacement compensation mechanism. After the main engine equipment is loaded onto the hoisting platform, it can automatically compensate for unbalanced displacement to achieve uniform force distribution on the hoisting ropes around the platform, thereby improving hoisting stability and equipment lifespan. In actual use, the marine main engine can be manually moved to the top mounting platform 1 for initial rough center observation and positioning. Then, personnel leave the top mounting platform 1, and the pressure sensor 53 is activated, along with the displacement compensation drive group 4. After receiving the pressure values ​​detected by the four pressure sensors 53, the controller compares the pressure values ​​of the opposite pressure sensors 53, and then controls the displacement compensation drive group 4 to move the top mounting platform 1 and the marine main engine towards the end with the larger pressure value, until the two opposite pressure values ​​are equalized. When the pressure difference detected by pressure sensor 53 is within the error range, the displacement compensation drive group 4 is turned off. This ensures that the marine main engine is located at the center of the center correction platform 2. Since the center correction platform 2 is located at the center of the bottom fixed platform 3, the marine main engine is also located at the center of the bottom fixed platform 3. Therefore, when the bottom fixed platform 3 is suspended later, it can be ensured that the tension of each set of lifting ropes on the periphery of the bottom fixed platform 3 is similar. At this time, the weight of the marine main engine can be evenly distributed to each set of lifting ropes, thereby ensuring that the lifting equipment above each set of lifting ropes can apply force evenly. This not only avoids tilting to one side, but also avoids the problem of poor stability of the lifting equipment due to uneven force on the surrounding lifting ropes. This also improves the service life of the lifting equipment and reduces the possible wear rate of a single set or one side when the lifting equipment is used for a long time.

[0023] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A marine main engine hoisting platform device with a displacement compensation mechanism, characterized in that, The system includes a top mounting platform, a center alignment platform, a bottom fixing platform, a displacement compensation drive group, and a sensing group. The top horizontal surface of the top mounting platform is used for positioning and mounting the marine main engine. The bottom horizontal surface of the top mounting platform rests on the center alignment platform and is driven by the displacement compensation drive group. The bottom side of the center alignment platform has an arc-shaped spherical protrusion. The top center of the bottom fixing platform has a groove that mates with the protrusion and is also arc-shaped. The sensing group includes four sets of inserts evenly distributed along the circumference of the center alignment platform. One end of each insert is fixed to the bottom fixing platform. The circumference of the center alignment platform has four sets of slots corresponding to the inserts. The insertion block has a buffer gap filled with a buffer pad between its horizontal top side and the slot at one end, and a pressure sensor is installed between its horizontal bottom side and the slot at the other end. The pressure sensor is used to detect the bearing pressure of the corresponding end area of ​​the upper part of the top mounting platform. When the pressure value detected by the pressure sensor at one end is greater than the pressure value detected by the pressure sensor on the opposite side, the displacement compensation drive group is activated to drive the top mounting platform to move towards the end with the larger pressure value. This continues until the pressure values ​​detected by any two sets of pressure sensors symmetrical about the center of the correction platform are the same, at which point the marine main engine above the top mounting platform is corrected to the center position of the platform.

2. The marine main engine hoisting platform device with displacement compensation mechanism according to claim 1, characterized in that, The protrusion and the groove are connected by a ball bearing.

3. A marine main engine hoisting platform device with a displacement compensation mechanism according to claim 2, characterized in that, The groove is a curved spherical unit that can be detachably connected to the bottom fixed platform.

4. A marine main engine hoisting platform device with a displacement compensation mechanism according to claim 3, characterized in that, The bottom side of the insert is provided with a horizontal T-shaped guide block, and the T-shaped guide block is horizontally guided and connected to the T-shaped guide groove opened at the top of the arc-shaped spherical unit and the bottom fixed platform. The insert is a right-angled insert, and the vertical right-angle end of the insert is also provided with a through hole. The insert and the bottom fixed platform are locked together by bolts passing through the through hole.

5. A marine main engine hoisting platform device with a displacement compensation mechanism according to claim 1, characterized in that, The horizontal top side of the central calibration platform is also provided with multiple sets of ball bearing units distributed circumferentially. Each ball bearing unit includes a top block, a second ball bearing, and a top cylinder. The top block is placed in a top groove opened on the top side of the central calibration platform. The top cylinder is placed in the top groove and is used to drive the top block to move up and down and reciprocate along the top groove. The horizontal top side of the top block is also provided with multiple sets of second balls bearing. When the second balls bearing on the top block protrude from the horizontal top side of the central calibration platform, they are used to support the top mounting platform to move up.

6. A marine main engine hoisting platform device with a displacement compensation mechanism according to claim 5, characterized in that, The top center of the center correction platform has a mounting groove. The displacement compensation drive group includes an X-axis slider slidably mounted in the mounting groove, a Y-axis slider slidably mounted on the X-axis slide plate, an X-axis lead screw mounted in the mounting groove for driving the X-axis slider to slide in the X direction, and a Y-axis lead screw mounted on the X-axis slider for driving the Y-axis slider to slide in the Y direction. The ends of the X-axis lead screw and the Y-axis lead screw are connected to the corresponding lead screw motors. Four sets of plugs are also located at the two ends of the corresponding X and Y directions. The bottom side of the top mounting platform also has a guide hole for guiding the Y-axis slider.

7. A marine main engine hoisting platform device with a displacement compensation mechanism according to claim 6, characterized in that, Multiple sets of horizontal locking cylinders are also provided around the guide hole. The driving end of the horizontal locking cylinder is connected to a horizontal locking rod. The Y-axis slider extends into the guide hole and is provided with a horizontal locking groove on its periphery. When the top mounting platform is horizontally pressed onto the center correction platform, the horizontal locking rod is driven by the corresponding horizontal locking cylinder to extend into the horizontal locking groove to lock the top mounting platform horizontally. When the top mounting platform is mounted on the ball bearing support, the horizontal locking rod is driven by the corresponding horizontal locking cylinder to disengage from the horizontal locking groove.

8. A marine main engine hoisting platform device with a displacement compensation mechanism according to claim 1, characterized in that, The bottom fixed platform has multiple sets of lifting rings evenly fixed around its periphery for connecting the lifting wire rope.

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