Marine main engine hoisting platform device with displacement compensation mechanism

Abstract

The invention provides a marine main engine hoisting platform device with a displacement compensation mechanism, and relates to a hoisting platform structure, the marine main engine hoisting platform device comprises a top mounting platform, a center correction platform, a bottom fixing platform, a displacement compensation driving group and an induction group, the bottom side of the center correction platform is provided with an arc-shaped spherical convex part to be matched with the bottom fixing platform; the induction group comprises four groups of insertion blocks, the insertion blocks are inserted into the center correction platform in the radial direction, and pressure sensors are arranged between the insertion blocks and the center correction platform and used for detecting the bearing pressure of the corresponding end area of the upper layer of the top mounting platform, so that the pressure values detected by the two groups of pressure sensors symmetrical about the center of the center correction platform are the same; after host equipment is fed to the hoisting platform, unbalanced displacement can be automatically compensated, so that the effect of uniform stress of hoisting ropes around the platform is achieved, the hoisting stability is improved, and the service life of the equipment is prolonged.

Description

Technical Field

[0001] The invention relates to a hoisting platform structure, in particular to a marine main engine hoisting platform device with a displacement compensation mechanism. Background Art

[0002] Hoisting is generally suitable for the overall transportation of large equipment such as marine main engines, so that there is no need to disassemble and transport the equipment, thereby greatly saving the time and labor costs of transportation. The marine main engine hoisting platform is an important structure for supporting and fixing 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 tooling for lifting large ship lift main engines (Announcement No. CN210973050U). However, the existing hoisting platforms are generally only used to provide installation and support, and have no function of correcting the equipment to the center of the hoisting platform. The position of the equipment when it is transported to the hoisting platform can only be roughly estimated manually. Therefore, when the lifting rope is used to lift the equipment, the lifting force on one side is often too large, resulting in tilting to one side or uneven force on the surrounding lifting ropes, 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 after long-term use. Summary of the Invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a marine main engine lifting platform device with a displacement compensation mechanism, which can automatically compensate for the unbalanced displacement after the main engine equipment is loaded onto the lifting platform, so as to achieve uniform force on the lifting ropes around the platform, thereby improving the lifting stability and the service life of the equipment.

[0004] The present invention provides the following technical solutions: A marine main engine hoisting platform device with a displacement compensation mechanism comprises a top mounting platform, a center correction platform, a bottom fixed platform, a displacement compensation drive group and a sensing group. The top side horizontal surface of the top mounting platform is used for positioning and installing the marine main engine. The marine main engine can be directly locked by the mounting screws at the bottom, or locked to the top side horizontal surface of the top mounting platform with the help of other guardrails around the marine main engine. The installation method is the existing technology and will not be described here. The bottom side horizontal surface of the top mounting platform is placed on the center correction platform and is connected to the center correction platform drive through the displacement compensation drive group. The bottom side of the center correction platform is provided with a raised portion with an arc-shaped spherical surface, and the top side center of the bottom fixed platform is provided with a groove portion which cooperates with the raised portion and is also an arc-shaped spherical surface. The sensing group includes four evenly distributed along the circumference of the center correction platform. an insert block, one end of the insert block is fixed to the bottom fixed platform, four groups of slots corresponding to the insert blocks are opened on the circumference of the center correction platform, a buffer gap filled with a buffer pad is provided between the horizontal top side of one end of the insert block inserted radially into the slot and the slot, and an installation gap with a pressure sensor is provided between the horizontal bottom side of one end of the insert block inserted radially into the slot and the slot, the pressure sensor is used to detect the bearing pressure of the corresponding end area of ​​the upper layer of the top installation 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 started to drive the top installation platform to move toward the end with the larger pressure value, until the pressure values ​​detected by any two groups of pressure sensors symmetrical about the center of the center correction platform are the same, and the marine main engine above the top installation platform is corrected to the center position of the platform; In actual use, the marine main engine can be manually moved to the top installation platform first, and an initial rough center observation and positioning can be carried out. Then the personnel exit the top installation platform, turn on the pressure sensor detection and start the displacement compensation drive group. After receiving the pressure values ​​detected by the four groups of pressure sensors, the controller compares the pressure values ​​of the opposite pressure sensors, and then controls the displacement compensation drive group to control the upper top installation platform and the marine main engine to move toward the end with the larger pressure value. When the difference in the pressure values ​​detected by the two relative groups of pressure sensors is within the error range, the displacement compensation drive group is turned off. At this time, it can be ensured that the marine main engine is located in the center of the center correction platform. Since the center correction platform is at the center of the bottom fixed platform, the marine main engine is also at the center of the bottom fixed platform. Therefore, when the bottom fixed platform is suspended later, it can ensure that the tension borne by each set of lifting ropes on the periphery of the bottom fixed platform is close. At this time, the gravity 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, which not only avoids tilting to one side, but also avoids the problem of poor stability of the lifting equipment caused by uneven force on the surrounding lifting ropes, thereby improving the service life of the lifting equipment and reducing the single group or single side wear rate that may occur when the lifting equipment is used for a long time.

[0005] Preferably, the protrusion and the groove are abutted by a ball, so that the tendency of sliding friction when there is imbalance between the central correction platform and the bottom fixed platform can be replaced by the tendency of rolling friction, thereby improving the accuracy during correction.

[0006] Preferably, the groove portion is a curved spherical unit detachably connected to the bottom fixed platform. The detachable manner can be directly locked with screws. Therefore, the local contact surface structure can be quickly replaced during subsequent maintenance, and the flexibility is also better.

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

[0008] Preferably, the horizontal top side of the center correction platform is also provided with multiple groups of ball units distributed along the circumferential direction, and the ball units include a top block, a second ball and a top cylinder. The top block is placed in a top groove opened on the top side of the center correction platform, and the top cylinder is placed in the top groove and is used to drive the top block to move up and down along the top groove. The horizontal top side of the top block is also provided with multiple groups of second balls. When the second ball on the top block protrudes from the horizontal top side of the center correction platform, it is 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 the X or Y position, the bottom side of the top mounting platform can be converted from sliding friction to rolling friction with the second ball, thereby making correction more time-saving and labor-saving.

[0009] Preferably, a mounting slot is provided at the center of the top side of the center correction platform, and the displacement compensation drive group includes an X-axis slider slidably mounted in the mounting slot, a Y-axis slider slidably mounted on the X-axis slide, an X-axis lead screw mounted in the mounting slot for driving the X-axis slider to slide in the X direction, and a Y-axis lead screw mounted on the X-axis slide 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 drive-connected to corresponding lead screw motors, and four groups of inserts are also located at the ends corresponding to the X and Y directions. The bottom side of the top mounting platform is further provided with a guide hole for guiding the Y-axis slider. Therefore, when the pressure sensor at one end of the X direction detects a pressure greater than the pressure value at the other end, the X-axis lead screw rotates and drives the X-axis slider to move the upper structure toward the end with the larger pressure value through threaded engagement. Similarly, when the pressure sensor at one end of the Y direction detects a pressure greater than the pressure value at the other end, the Y-axis lead screw rotates and drives the Y-axis slider to move the upper structure toward the end with the larger pressure value through threaded engagement, making adjustment more convenient.

[0010] Preferably, a plurality of groups of horizontal locking cylinders are provided on the peripheral side of the guide hole, and the driving end of the horizontal locking cylinder is connected to a horizontal locking rod, and a horizontal locking groove is provided on the peripheral side of the Y-axis slider extending into the guide hole. When the top mounting platform is horizontally pressed on 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, and when the ball bearing supports the top mounting platform, the horizontal locking rod is driven by the corresponding horizontal locking cylinder to disengage from the horizontal locking groove, thereby ensuring that the top mounting platform can be easily corrected and adjusted, and can also be stably supported after adjustment.

[0011] Preferably, a plurality of groups of lifting rings for connecting lifting wire ropes are evenly fixed on the periphery of the bottom mounting platform along the circumferential direction.

[0012] The beneficial effects of the present invention are as follows: the present invention provides a marine main engine hoisting platform device with a displacement compensation mechanism, which can automatically compensate for unbalanced displacement after the main engine equipment is loaded onto the hoisting platform, so as to achieve uniform force on the hoisting ropes around the platform, thereby improving the stability of the lifting and the service life of the equipment; in actual use, the marine main engine can be manually transported to the top installation platform first, and an initial rough center observation and positioning can be performed, and then the personnel can exit the top installation platform, turn on the detection of the pressure sensor and start the displacement compensation drive group, and after receiving the pressure values ​​detected by the four groups of pressure sensors, the controller compares the pressure values ​​of the opposite side pressure sensors, and then controls the displacement compensation drive group to control the upper top installation platform and the marine main engine to move toward the end with the larger pressure value until the two relative pressure values ​​are equal. When the pressure value difference detected by the force sensor is within the error range, the displacement compensation drive group is turned off. At this time, it can ensure that the marine main engine is located at the center of the central correction platform. Since the central correction platform is at the center of the bottom fixed platform, the marine main engine is also at the center of the bottom fixed platform. Therefore, when the bottom fixed platform is suspended later, it can ensure that the tension borne by each set of lifting ropes on the side of the bottom fixed platform is close. At this time, the gravity 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, which not only avoids tilting to one side, but also avoids the problem of poor stability of the lifting equipment caused by uneven force on the surrounding lifting ropes. In this way, the service life of the lifting equipment is improved, and the wear rate of a single group or a single side that may occur when the lifting equipment is used for a long time is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying 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 of the present invention. In the accompanying drawings: Figure 1 This is a cross-sectional view of the main structure of the present invention, in which the top mounting platform is supported by two balls so as to be adjusted by the displacement compensation driving group; Figure 2 This is a cross-sectional view of the main structure after the displacement compensation drive group of the present invention drives the top mounting platform to adjust; Figure 3 yes Figure 1 A top-down cross-section view after removing the top mounting platform; Figure 4 is a side view of the plug; Markings in the figure: 1. Top mounting platform; 2. Center correction 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 1; 23. Top block; 24. Ball 2; 25. Top cylinder; 26. Mounting slot; 31. Arc sphere unit; 32. Lifting ring; 41. X-axis slider; 42. Y-axis slider; 43. X-axis screw; 44. Y-axis screw; 45. Horizontal locking slot; 51. Insert block; 52. Buffer gap; 53. Pressure sensor; 54. T-shaped guide block; 55. Through hole. DETAILED DESCRIPTION

[0014] Example 1 like Figure 1-4 As shown, a marine main engine lifting platform device with a displacement compensation mechanism, in this embodiment, includes a top mounting platform 1, a center correction platform 2, a bottom fixed platform 3, a displacement compensation drive group 4 and a sensing group 5. The top side horizontal surface of the top mounting platform 1 is used to position and install the marine main engine. The marine main engine can be locked by directly locking the bottom mounting screws, or by means of other guardrails surrounding the marine main engine, which are locked on the top side horizontal surface of the top mounting platform 1. The installation method is the existing technology and will not be described here. The bottom side horizontal surface of the top mounting platform 1 is placed on the center correction platform 2 and is connected to the center correction platform 2 through the displacement compensation drive group 4. The bottom side of the center correction platform 2 is provided with a raised portion 21 with an arc-shaped spherical surface, and the top side center of the bottom fixed platform 3 is provided with a groove portion which cooperates with the raised portion 21 and is also an arc-shaped spherical surface. The sensing group 5 includes four uniformly distributed along the circumference of the center correction platform 2. A plug-in block 51 is provided, one end of which is fixed on the bottom fixed platform 3. Four groups of slots corresponding to the plug-in blocks 51 are provided on the circumference of the center correction platform 2. A buffer gap 52 filled with a buffer pad is provided between the horizontal top side of one end of the plug-in block 51 inserted radially into the slot and the slot, and an installation gap with a pressure sensor 53 is provided between the horizontal bottom side of one end of the plug-in block 51 inserted radially into the slot and the slot. The pressure sensor 53 is used to detect the bearing pressure of the corresponding end area of ​​the upper layer of the top installation 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 started to drive the top installation platform 1 to move toward the end with the larger pressure value, until the pressure values ​​detected by any two groups of pressure sensors 53 symmetrical about the center of the center correction platform 2 are the same, and the marine main engine above the top installation platform 1 is corrected to the center position of the platform; In actual use, the marine main engine can be manually moved to the top installation platform 1, and an initial rough center observation and positioning can be performed. Then the personnel exit the top installation platform 1, turn on the detection of the pressure sensor 53 and start the displacement compensation drive group 4. After receiving the pressure values ​​detected by the four groups of 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 control the upper top installation platform 1 and the marine main engine to move toward the end with the larger pressure value, until the difference in the pressure values ​​detected by the two relative groups of pressure sensors 53 is within the error range, then the displacement compensation drive group 4 is turned off, and at this time, it can be ensured that the marine main engine is in the center correction position. The center of the platform 2, since the center correction platform 2 is at the center of the bottom fixed platform 3, the marine main engine is also 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 borne by each set of lifting ropes on the side of the bottom fixed platform 3 is close. At this time, the gravity 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, which not only avoids tilting to one side, but also avoids the problem of poor stability of the lifting equipment caused by uneven force on the surrounding lifting ropes, thereby improving the service life of the lifting equipment and reducing the single group or single side wear rate that may occur when the lifting equipment is used for a long time.

[0015] Example 2 A marine main engine lifting platform device with a displacement compensation mechanism is disclosed. In this embodiment, it is a further limitation based on Example 1. The protrusion 21 and the groove portion are abutted by a ball 22, so that the sliding friction tendency when there is imbalance between the center correction platform 2 and the bottom fixed platform 3 can be replaced by the rolling friction tendency, thereby improving the accuracy during correction.

[0016] The groove portion is a curved spherical unit 31 detachably connected to the bottom fixed platform 3. The detachable manner can be directly locked with screws. Therefore, the local contact surface structure can be quickly replaced during subsequent maintenance, and the flexibility is also better.

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

[0018] The horizontal top side of the central correction platform 2 is also provided with multiple groups of ball units distributed along the circumferential direction, and the ball units include a top block 23, a second ball 24 and a top cylinder 25. The top block 23 is placed in a top groove opened on the top side of the central correction platform 2, and the top cylinder 25 is placed in the top groove and is used to drive the top block 23 to move up and down along the top groove. The horizontal top side of the top block 23 is also provided with multiple groups of second balls 24. When the second ball 24 on the top block 23 protrudes from the horizontal top side of the central correction platform 2, it is 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 the X-direction or Y-direction position, the bottom side of the top mounting platform 1 can be converted from sliding friction to rolling friction with the second ball 24, thereby making correction more time-saving and labor-saving.

[0019] A mounting slot 26 is provided at the top center of the center correction platform 2. The displacement compensation drive group 4 includes an X-direction slider 41 slidably mounted in the mounting slot 26, a Y-direction slider 42 slidably mounted on the X-direction slider, an X-direction lead screw 43 mounted in the mounting slot 26 for driving the X-direction slider 41 to slide in the X direction, and a Y-direction lead screw 44 mounted on the X-direction slider 41 for driving the Y-direction slider 42 to slide in the Y direction. The ends of the X-direction lead screw 43 and the Y-direction lead screw 44 are connected to corresponding lead screw motor drives, and four groups of plug blocks 51 are also at the corresponding ends of the X and Y directions. The bottom side of the top mounting platform 1 is also provided with a guide hole 11 for guiding the outside of the Y-direction slider 42. Therefore, when the pressure sensor 53 at one end of the X-direction detects that the pressure is greater than the pressure value at the other end, the X-direction screw rod 43 rotates, and the X-direction slider 41 is driven by the thread to drive the upper structure toward the end with the larger pressure value. Similarly, when the pressure sensor 53 at one end of the Y-direction detects that the pressure is greater than the pressure value at the other end, the Y-direction screw rod 44 rotates, and the Y-direction slider 42 is driven by the thread to drive the upper structure toward the end with the larger pressure value, which is more convenient to adjust.

[0020] A plurality of groups of horizontal locking cylinders 12 are further provided on the peripheral side of the guide hole 11, and the driving end of the horizontal locking cylinder 12 is connected to a horizontal locking rod 13. The peripheral side of the Y-direction slider 42 extending into the guide hole 11 is provided with a horizontal locking groove 45. 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, thereby ensuring that the top mounting platform 1 can be easily corrected and adjusted, and can also be stably supported after adjustment.

[0021] A plurality of groups of lifting rings 32 for connecting lifting wire ropes are evenly fixed on the periphery of the bottom mounting platform along the circumferential direction.

[0022] The working principle of the present invention is as follows: the present invention provides a marine main engine hoisting platform device with a displacement compensation mechanism, which can automatically compensate for unbalanced displacement after the main engine equipment is loaded onto the hoisting platform, so as to achieve uniform force on the hoisting ropes around the platform, thereby improving the stability of the lifting and the service life of the equipment; in actual use, the marine main engine can be manually moved to the top installation platform 1, and an initial rough center observation and positioning can be performed, and then the personnel can exit the top installation platform 1, and turn on the detection of the pressure sensor 53 and start the displacement compensation drive group 4. After receiving the pressure values ​​detected by the four groups of pressure sensors 53, the controller compares the pressure values ​​of the opposite side pressure sensors 53, and then controls the displacement compensation drive group 4 to control the upper top installation platform 1 and the marine main engine to move toward the end with the larger pressure value, until the two opposite groups When the pressure value difference detected by the pressure sensor 53 is within the error range, the displacement compensation drive group 4 is turned off. At this time, it can ensure that the marine main engine is located at the center of the central correction platform 2. Since the central correction platform 2 is at the center of the bottom fixed platform 3, the marine main engine is also 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 borne by each group of lifting ropes on the side of the bottom fixed platform 3 is close. At this time, the gravity of the marine main engine can be evenly distributed to each group of lifting ropes, thereby ensuring that the lifting equipment above each group of lifting ropes can apply force evenly, which not only avoids tilting to one side, but also avoids the problem of poor stability of the lifting equipment caused by uneven force on the surrounding lifting ropes. In this way, the service life of the lifting equipment is improved, and the single group or single side wear rate that may occur when the lifting equipment is used for a long time is also reduced.

[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 aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A marine main engine hoisting platform device with a displacement compensation mechanism, characterized in that: It includes a top mounting platform, a center correction platform, a bottom fixed 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 bottom horizontal surface of the top mounting platform is placed on the center correction platform and is connected to the center correction platform through the displacement compensation drive group. The bottom side of the center correction platform is provided with a raised portion with an arc-shaped spherical surface. The top center of the bottom fixed platform is provided with a groove portion which is also an arc-shaped spherical surface and cooperates with the raised portion. The sensing group includes four groups of plug-ins evenly distributed along the circumference of the center correction platform. One end of the plug-in block is fixed on the bottom fixed platform. Four groups of slots corresponding to the plug-in blocks are provided on the circumference of the center correction platform. A buffer gap filled with a buffer pad is provided between the horizontal top side of one end of the plug-in block inserted radially into the slot and the slot, and an installation gap with a pressure sensor is provided between the horizontal bottom side of one end of the plug-in block inserted radially into the slot and the slot. The pressure sensor is used to detect the bearing pressure of the corresponding end area of ​​the upper layer 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 started to drive the top mounting platform to move toward the end with the larger pressure value, until the pressure values ​​detected by any two groups of pressure sensors symmetrical about the center of the central correction platform are the same, and the marine main engine above the top mounting platform is corrected to the center position of the platform.

2. A marine main engine hoisting platform device with a displacement compensation mechanism according to claim 1, characterized in that: The protrusion and the groove are in contact with each other via a ball.

3. A marine main engine hoisting platform device with a displacement compensation mechanism according to claim 2, characterized in that: The groove portion is a curved spherical unit 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: A horizontal T-shaped guide block is provided on the bottom side of the plug block, and the T-shaped guide block is horizontally guided and connected to the T-shaped guide groove provided on the top of the arc-surface sphere unit and the bottom fixed platform. The plug block is a right-angled plug block, and a through hole is also provided at the vertical right-angle end of the plug block. The plug block and the bottom fixed platform are locked and connected with the bottom fixed platform by bolts passing through the through hole.

5. The 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 correction platform also has multiple groups of ball units distributed along the circumferential direction, and the ball unit includes a top block, a second ball and a top cylinder. The top block is placed in a top groove opened on the top side of the central correction platform. The top cylinder is placed in the top groove and is used to drive the top block to move up and down along the top groove. The horizontal top side of the top block is also provided with multiple groups of second balls. When the second ball on the top block protrudes from the horizontal top side of the central correction platform, it is 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: A mounting slot is provided at the center of the top side of the center correction platform. The displacement compensation drive group includes an X-axis slider slidably installed in the mounting slot, a Y-axis slider slidably installed on the X-axis slide, an X-axis lead screw installed in the mounting slot for driving the X-axis slider to slide in the X direction, and a Y-axis lead screw installed on the X-axis slide 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 corresponding lead screw motors, and four groups of plug blocks are also located at the corresponding ends of the X and Y directions. A guide hole for guiding the outside of the Y-axis slider is also provided on the bottom side of the top mounting platform.

7. A marine main engine hoisting platform device with a displacement compensation mechanism according to claim 6, characterized in that: A plurality of groups of horizontal locking cylinders are further provided on the peripheral side of the guide hole, and the driving end of the horizontal locking cylinder is connected to a horizontal locking rod. A horizontal locking groove is provided on the peripheral side of the Y-direction slider extending into the guide hole. 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, and when the ball bearing supports the top mounting platform, the horizontal locking rod is driven by the corresponding horizontal locking cylinder to disengage from the horizontal locking groove.

8. The marine main engine hoisting platform device with a displacement compensation mechanism according to claim 1, characterized in that: A plurality of groups of lifting rings for connecting lifting wire ropes are evenly fixed on the periphery of the bottom mounting platform along the circumferential direction.

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