A protection device for frequency conversion control system of offshore floating crane

Abstract

The present invention discloses a variable frequency control system protection device for an offshore floating crane in the technical field of floating crane control systems, comprising an inner protection frame and a mounting base plate, wherein the inner protection frame is provided with two groups and the two groups are symmetrically arranged and are both slidably connected to the upper surface of the inner protection frame, and the two ends of the two groups of inner protection frames can fit together to form a rectangular annular closed space on the upper surface of the mounting base plate, and a built-in curved plate is fixedly installed on the upper surface of the mounting base plate corresponding to the inner protection frame, and the upper ends of the built-in curved plates are bent toward the direction of the inner protection frame, and the built-in curved plates separate the annular closed space formed by the inner protection frame and the mounting base plate into an outer water storage bin and an inner mounting bin, and a waterproof platform is fixedly installed in the inner mounting bin, and auxiliary exhaust equipment is arranged in the waterproof platform, and horizontal equipment is arranged on the upper surface of the waterproof platform. The present invention provides a control system protection device with higher stability that is not disturbed by the shaking of the floating ship and can resist seawater invasion without affecting the heat dissipation condition.

Description

Technical Field

[0001] The invention relates to the technical field of floating crane control systems, in particular to a frequency conversion control system protection device for an offshore floating crane. Background Art

[0002] A floating crane (also known as a crane ship or floating crane) is a kind of engineering vessel that is specially used for lifting operations on water. It has a wide range of applications, such as using it to complete cargo loading and unloading in ports; completing salvage and rescue in maritime accidents; completing port construction, bridge building, and equipment installation in various harbors and offshore marine engineering projects; completing equipment outfitting and repair in shipyards; and in recent years, with the development of offshore oil, relying on super-large floating cranes, the construction and installation of drilling platforms have been completed. It can be seen that floating cranes are indispensable for any occasion where lifting operations are required on water. Floating window cranes generally consist of floating windows and lifting booms. The control system of the crane is fixed on the floating boat together with the boom base.

[0003] The control system consists of sensors, driving power supplies and Bluetooth modules. The control system is used to control the operation of the boom, which is the key to the operation of the floating crane. However, there are precision parts in the control system. If the control system is directly fixed on the floating vessel, not only will the invasion of seawater interfere with the operation of the parts in the control system, but the parts in contact with seawater are also prone to rapid corrosion. The floating vessel is prone to shaking with the seawater and has poor stability, which causes the parts in the control system to shake with the shaking of the floating vessel. The parts are subjected to more shaking and impact, which makes it easy for the parts in the control system to have relative displacement, thereby interfering with the service life of the parts. Summary of the invention

[0004] The technical problem of the present invention is to provide a frequency conversion control system protection device for an offshore floating crane, so as to provide a control system protection device which is not disturbed by the swaying of the floating ship and has higher stability and can resist seawater invasion without affecting the heat dissipation condition.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a protection device for a variable frequency control system of an offshore floating crane, comprising an inner protection frame and a mounting base plate, the inner protection frame is provided with two groups and the two groups are symmetrically arranged and are both slidably connected to the upper surface of the inner protection frame, the two ends of the inner protection frames of the two groups can fit together to form a rectangular annular closed space on the upper surface of the mounting base plate, the upper surface of the mounting base plate is fixedly provided with a built-in curved plate corresponding to the inner part of the inner protection frame, the upper ends of the built-in curved plates are bent toward the direction of the inner protection frame, the built-in curved plates divide the annular closed space formed by the inner protection frame and the mounting base plate into an outer water storage bin and an inner mounting bin, a waterproof platform is fixedly provided in the inner mounting bin, an auxiliary exhaust device is provided in the waterproof platform, a horizontal device is provided on the upper surface of the waterproof platform, a mounting plate is fixedly provided on the upper end of the horizontal device, a control system body is fixedly provided on the upper surface of the mounting plate, and the horizontal device can maintain the horizontal state of the upper mounting plate when the mounting base plate tilts with the floating vessel.

[0006] As a further solution of the present invention, the horizontal device includes a rotating seat, which is rotatably installed on the upper surface of the waterproof platform, the upper end of the rotating seat is above the waterproof platform, an electric telescopic rod is fixedly installed on the upper end of the rotating seat, the upper end of the electric telescopic rod is rotatably connected to the mounting plate, the mounting plate and the waterproof platform are provided with multiple limit springs, the lower end of the rotating seat is inside the waterproof platform, and a connecting rod is fixedly installed on the lower end of the rotating seat, a gravity ball is fixedly installed on the lower end of the connecting rod, a fluorescent mark is provided on the gravity ball, and a fluorescent sensing device is provided at the upper end of the waterproof platform and corresponding to the edge of the rotating seat.

[0007] As a further solution of the present invention, the auxiliary exhaust equipment includes an intermediate shaft and a mounting shaft. An intermediate shaft is rotatably mounted in the middle position of the waterproof platform. The mounting shaft is provided with multiple groups and are rotatably mounted on the waterproof platform and are evenly distributed on both sides of the intermediate shaft. A ventilation fan is fixedly mounted on the upper end of the mounting shaft, and a transmission gear is fixedly mounted on the lower end of the mounting shaft. A transmission chain is connected to the outer sleeve of the transmission gear on the same side. Side gears are fixedly mounted on the mounting shaft close to the intermediate shaft, and an intermediate gear is fixedly mounted on the intermediate shaft. The intermediate gear is meshed with the side gears, and a plurality of ventilation grooves are evenly arranged on the upper surface of the waterproof platform.

[0008] As a further solution of the present invention, an outer protective frame is fixedly installed on the side of the inner protective frame away from the built-in curved plate, and multiple through holes are opened on the inner and outer protective frames. Multiple drainage pipes are fixedly installed on the lower surface of the outer water storage bin, and one-way valves are fixedly installed on the drainage pipes.

[0009] As a further solution of the present invention, the outer protective frame is an L-shaped plate, the long side of the outer protective frame is slightly larger than the long side of the inner protective frame, the short side of the outer protective frame is twice the short side of the inner protective frame, a positioning piece is fixedly installed at one end of the long side of the outer protective frame away from its short side, and locking nuts are rotatably installed at both upper and lower ends of the positioning piece. A positioning hole is opened on the outer protective frame at a position corresponding to the locking nut, and a threaded rod is fixedly installed on the side of the short side of the outer protective frame away from the long side, and the threaded rod corresponds to the position of the positioning hole and fits with the thread of the locking nut.

[0010] As a further solution of the present invention, an embedding groove is opened on one short side of the inner protective frame away from the long side, and an embedded magnetic block is fixedly installed on the short side of the inner protective frame away from the embedding groove. The embedded magnetic block matches the embedding groove, and the magnetism of the embedded magnetic block is opposite to that of the embedding groove.

[0011] As a further solution of the present invention, an upper sealing cover is fixedly installed on the upper surface of the inner protective frame, a connecting plate is fixedly installed on the upper surface of the upper sealing cover on one side, and the outer surfaces of the outer protective frame, the upper sealing cover and the connecting plate are coated with anti-corrosion paint.

[0012] As a further solution of the present invention, bolt holes are provided at the edge of the mounting base plate, and the bolt holes can cooperate with bolts to fix the mounting base plate on the surface of the floating vessel.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. In the present invention, the installation base plate is fixed on the floating boat. When the floating boat is shaken by the action of seawater, the installation base plate tilts with the floating boat. At this time, the horizontal device can maintain the level of the upper surface of the installation plate when the floating boat tilts, thereby avoiding the control system body from tilting, reducing the shaking and impact of the internal parts of the control system, reducing the interference of external forces on the internal parts of the control system body, maintaining the position and use stability of the internal parts of the control system body, reducing the possibility of parts in the control system falling off due to vibration and shaking, improving the service life of the control system, increasing the ability of the device to resist external interference, and improving the device's protection ability for the control system.

[0014] 2. In the present invention, the control system body is arranged on a mounting plate which is placed in an inner mounting compartment wrapped by an inner curved plate, and an inner protective frame and an outer protective frame are arranged outside the inner curved plate for double protection. During the operation of the control system body, the auxiliary exhaust equipment blows air from bottom to top, so that the heat of the control system body can overflow from the upper end of the inner curved plate and then be discharged from the through holes on the inner protective frame and the outer protective frame for heat dissipation. In addition, while ensuring that the working heat dissipation of the control system body is not affected, the control system body is isolated from possible erosion by external seawater, and seawater intrusion is avoided to interfere with the operation of the control system. At the same time, the contact between seawater and the control system body is avoided to corrode the control system, thereby shortening the service life of the control system, thereby ensuring the operating temperature of the control system and increasing the service life of the control system body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 For the present invention Figure 1 Partial schematic diagram of the structure at A in the middle.

[0018] Figure 3 It is a schematic diagram of the structure of the present invention in an open state.

[0019] Figure 4 For the present invention Figure 3 Partial schematic diagram of the structure at point B in the middle.

[0020] Figure 5 For the present invention Figure 3 Partial schematic diagram of the structure at point C in the middle.

[0021] Figure 6 It is a schematic diagram of the structure of the present invention when viewed from above.

[0022] Figure 7 The structure of the present invention is cut away Figure 1 .

[0023] Figure 8 For the present invention Figure 7 Partial schematic diagram of the structure at point D in the middle.

[0024] Fig. 9 The structure of the present invention is cut away Figure 2 .

[0025] Fig.10 For the present invention Fig. 9 Partial schematic diagram of the structure at E in the middle.

[0026] In the accompanying drawings, the list of parts represented by each reference numeral is as follows: 1. Inner protective frame; 2. Outer protective frame; 3. Upper sealing cover; 4. Control system body; 5. Connecting plate; 6. Through hole; 7. Mounting base plate; 8. Drain pipe; 9. Positioning piece; 10. Locking nut; 11. Threaded rod; 12. Embedded magnetic block; 13. Built-in curved plate; 14. Mounting plate; 15. Positioning hole; 16. Embedded groove; 17. Outer water storage bin; 18. Inner mounting bin; 19. Waterproof platform; 20. Ventilation groove; 21. Ventilating fan; 22. Intermediate gear; 23. Intermediate shaft; 24. Side gear; 25. Transmission chain; 26. One-way valve; 27. Transmission gear; 28. Mounting shaft; 29. ​​Electric telescopic rod; 30. Rotating seat; 31. Gravity ball; 32. Connecting rod. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-Figure 10 The present invention provides a technical solution: a protection device for a variable frequency control system of an offshore floating crane, comprising an inner protection frame 1 and a mounting base plate 7, wherein the inner protection frame 1 is provided with two groups and the two groups are symmetrically arranged and are both slidably connected to the upper surface of the inner protection frame 1, and the two ends of the two groups of inner protection frames 1 can fit each other to form a rectangular annular closed space on the upper surface of the mounting base plate 7, and a built-in curved plate 13 is fixedly installed on the upper surface of the mounting base plate 7 corresponding to the inner protection frame 1, and the upper ends of the built-in curved plates 13 are bent toward the direction of the inner protection frame 1, and the built-in curved plates 13 divide the annular closed space formed by the inner protection frame 1 and the mounting base plate 7 into an outer water storage bin 17 and an inner mounting bin 18, and a waterproof platform 19 is fixedly installed in the inner mounting bin 18, and an auxiliary exhaust device is arranged in the waterproof platform 19, and a horizontal device is arranged on the upper surface of the waterproof platform 19, and a mounting plate 14 is fixedly installed on the upper end of the horizontal device, and a control system body 4 is fixedly installed on the upper surface of the mounting plate 14, and the horizontal device can maintain the horizontal state of the upper mounting plate 14 when the mounting base plate 7 tilts with the floating vessel.

[0029] During operation, the control system body 4 of the present invention is provided with a mounting plate 14 placed in an inner mounting chamber 18 wrapped by an inner curved plate 13, and an inner protective frame 1 and an outer protective frame 2 are provided outside the inner curved plate 13 for double protection. During the operation of the control system body 4, the auxiliary exhaust device blows air from bottom to top, so that the heat of the control system body 4 can overflow from the upper end of the inner curved plate 13 and then be discharged from the through holes 6 on the inner protective frame 1 and the outer protective frame 2 for heat dissipation, and under the condition that the heat dissipation of the control system body 4 is not affected, the possibility of erosion of the control system body 4 by external seawater is isolated (when seawater invades the floating ship, it first contacts the outer protective frame 2, and the seawater can pass through the outer protective frame 2). The through holes 6 on the protective frame 2 and the inner protective frame 1 enter the installation base plate 7, but due to the obstruction of the built-in curved plate 13, the seawater can only enter the outer water storage bin 17 formed by the inner protective frame 1 and the built-in curved plate 13. The seawater is blocked in the outer water storage bin 17 and cannot enter the inner installation bin 18. Then the seawater can be discharged through the drain pipe 8 at the bottom of the outer water storage bin 17, thereby isolating the possibility of seawater contacting the control system main body 4), avoiding seawater intrusion to interfere with the operation of the control system, and at the same time avoiding the possibility of seawater contacting the control system main body 4 to corrode the control system and shorten the service life of the control system, ensuring the operating temperature of the control system, and increasing the service life of the control system main body 4. The mounting base plate 7 is fixed on the pontoon. When the pontoon is shaken by the action of seawater, the mounting base plate 7 tilts with the pontoon. At this time, the horizontal device (the gravity ball 31 in the horizontal device raises the traction rope and is fixedly connected to the lower end of the connecting rod 32. When the mounting base plate 7 tilts with the pontoon, the gravity ball 31 always moves vertically downward under the action of gravity. The gravity ball 31 pulls the lower end of the connecting rod 32, so that the connecting rod 32 rotates in the opposite direction of the tilt direction of the mounting base plate 7 along with the rotating seat 30, so that the horizontal displacement of the mounting plate 14 can be opposite to the horizontal displacement direction of the tilt of the mounting base plate 7, maintaining the stability of the horizontal position of the mounting plate 14. At the same time, the gravity ball 31 moves, and the fluorescent sensing device senses the change of the fluorescent mark on it, driving the electric telescopic rod 29 on the side close to the fluorescent mark to extend, and the electric telescopic rod 29 on the side close to the fluorescent mark is extended. The rod 29 is extended so that the mounting plate 14 can remain horizontal when the mounting base plate 7 is tilted. The greater the inclination of the mounting base plate 7, the greater the relative movement position of the gravity ball 31, and the greater the change in the fluorescent mark detected by the fluorescent detection equipment, thereby driving the electric telescopic rod 29 on one side to extend to a greater length). The upper surface of the mounting plate 14 can be maintained horizontal when the floating boat is tilted, thereby avoiding the control system body 4 from tilting, reducing the shaking and impact of the internal parts of the control system, reducing the interference of external forces on the internal parts of the control system body 4, maintaining the position and use stability of the internal parts of the control system body 4, reducing the possibility of parts in the control system falling off due to vibration and shaking, improving the service life of the control system, increasing the ability of the device to resist external interference, and improving the protection ability of the device to the control system.

[0030] In the present invention, the mounting base plate 7 is fixed on the floating boat. When the floating boat is shaken by the action of seawater, the mounting base plate 7 tilts along with the floating boat. At this time, the horizontal device can maintain the level of the upper surface of the mounting plate 14 when the floating boat is tilted, thereby avoiding the control system body 4 from tilting, reducing the shaking and impact of the internal parts of the control system, reducing the interference of external forces on the internal parts of the control system body 4, maintaining the position and use stability of the internal parts of the control system body 4, reducing the possibility of parts in the control system falling off due to vibration and shaking, improving the service life of the control system, increasing the ability of the device to resist external interference, and improving the protection ability of the device to the control system.

[0031] In the present invention, the control system body 4 is provided with a mounting plate 14 placed in an inner mounting compartment 18 wrapped by a built-in curved plate 13, and the built-in curved plate 13 is provided with a double layer of protection of an inner protective frame 1 and an outer protective frame 2. During the operation of the control system body 4, the auxiliary exhaust equipment blows air from bottom to top, so that the heat of the control system body 4 can overflow from the upper end of the built-in curved plate 13 and then be discharged from the through holes 6 on the inner protective frame 1 and the outer protective frame 2 for heat dissipation. In addition, while ensuring that the working heat dissipation of the control system body 4 is not affected, the possibility of external seawater erosion on the control system body 4 is isolated, and seawater intrusion is avoided to interfere with the operation of the control system. At the same time, the possibility of seawater contacting with the control system body 4 to corrode the control system and thereby shorten the service life of the control system is avoided, thereby ensuring the operating temperature of the control system and increasing the service life of the control system body 4.

[0032] As a further solution of the present invention, the horizontal device includes a rotating seat 30, which is rotatably installed on the upper surface of the waterproof platform 19. The upper end of the rotating seat 30 is above the waterproof platform 19. An electric telescopic rod 29 is fixedly installed on the upper end of the rotating seat 30. The upper end of the electric telescopic rod 29 is rotatably connected to the mounting plate 14. The mounting plate 14 and the waterproof platform 19 are provided with multiple limit springs. The lower end of the rotating seat 30 is inside the waterproof platform 19, and a connecting rod 32 is fixedly installed on the lower end of the rotating seat 30. A gravity ball 31 is fixedly installed on the lower end of the connecting rod 32. A fluorescent mark is set on the gravity ball 31. A fluorescent sensing device is set at the upper end of the waterproof platform 19 and corresponding to the edge of the rotating seat 30.

[0033] During operation, the gravity ball 31 in the horizontal device raises the traction rope and is fixedly connected with the lower end of the connecting rod 32. When the mounting base 7 tilts with the floating ship, the gravity ball 31 always moves vertically downward under the action of gravity, and the gravity ball 31 pulls the lower end of the connecting rod 32, so that the connecting rod 32 rotates in the opposite direction of the tilt direction of the mounting base 7 along with the rotating seat 30, so that the horizontal displacement of the mounting plate 14 can be opposite to the horizontal displacement direction of the tilt of the mounting base 7, maintaining the stability of the horizontal position of the mounting plate 14. At the same time, the gravity ball 31 moves, and the fluorescent sensing device senses the change of the fluorescent mark thereon, and drives the electric telescopic rod 29 on the side close to the fluorescent mark to extend. The electric telescopic rod 29 on one side extends, so that the mounting plate 14 can still remain horizontal when the mounting base 7 is tilted. The greater the inclination of the mounting base 7, the greater the relative movement position of the gravity ball 31, and the greater the change of the fluorescent mark detected by the fluorescent detection device, thereby driving the electric telescopic rod 29 on one side to extend.

[0034] As a further solution of the present invention, the auxiliary exhaust equipment includes an intermediate shaft 23 and an installation shaft 28. The intermediate shaft 23 is rotatably installed in the middle position of the waterproof platform 19. There are multiple groups of installation shafts 28, which are rotatably installed on the waterproof platform 19 and are evenly distributed on both sides of the intermediate shaft 23. A ventilation fan 21 is fixedly installed on the upper end of the installation shaft 28, and a transmission gear 27 is fixedly installed on the lower end of the installation shaft 28. A transmission chain 25 is connected to the outer sleeve of the transmission gear 27 on the same side. Side gears 24 are fixedly installed on the installation shaft 28 close to the intermediate shaft 23, and an intermediate gear 22 is fixedly installed on the intermediate shaft 23. The intermediate gear 22 is meshed with the side gear 24. A plurality of ventilation slots 20 are evenly opened on the upper surface of the waterproof platform 19.

[0035] During operation, when seawater invades the floating vessel, it first contacts the outer protective frame 2. The seawater can enter the installation base plate 7 through the through holes 6 on the outer protective frame 2 and the inner protective frame 1. However, due to the obstruction of the built-in curved plate 13, the seawater can only enter the outer water storage bin 17 formed by the inner protective frame 1 and the built-in curved plate 13. The seawater is blocked in the outer water storage bin 17 and cannot enter the inner installation bin 18. Then the seawater can be discharged through the drain pipe 8 at the bottom of the outer water storage bin 17, thereby isolating the possibility of seawater contacting the control system body 4.

[0036] As a further solution of the present invention, an outer protective frame 2 is fixedly installed on the side of the inner protective frame 1 away from the built-in curved plate 13, and multiple through holes 6 are opened on the inner protective frame 1 and the outer protective frame 2. A plurality of drain pipes 8 are fixedly installed on the lower surface of the outer water storage bin 17, and a one-way valve 26 is fixedly installed on the drain pipes 8.

[0037] As a further solution of the present invention, the outer protective frame 2 is an L-shaped plate, the long side of the outer protective frame 2 is slightly larger than the long side of the inner protective frame 1, and the short side of the outer protective frame 2 is twice the short side of the inner protective frame 1. A positioning piece 9 is fixedly installed at one end of the long side of the outer protective frame 2 away from its short side, and locking nuts 10 are rotatably installed at both upper and lower ends of the positioning piece 9. A positioning hole 15 is opened on the outer protective frame 2 at a position corresponding to the locking nut 10, and a threaded rod 11 is fixedly installed on the side of the short side of the outer protective frame 2 away from the long side. The threaded rod 11 corresponds to the position of the positioning hole 15 and is threadably matched with the locking nut 10.

[0038] During operation, the outer protective frame is fixed by threaded rods and locking nuts. The outer protective frames on both sides can be pulled open to both sides. The inner protective frame is fixedly connected by embedded grooves and embedded magnetic blocks, and can also be pulled open to both sides, making it convenient for users to inspect and repair the control system body.

[0039] As a further solution of the present invention, an embedding groove 16 is opened on one short side of the inner protective frame 1 and away from the long side, and an embedded magnetic block 12 is fixedly installed on the short side of the inner protective frame 1 away from the embedding groove 16. The embedded magnetic block 12 matches the embedding groove 16, and the magnetism of the embedded magnetic block 12 is opposite to that of the embedding groove 16.

[0040] As a further solution of the present invention, an upper sealing cover 3 is fixedly installed on the upper surface of the inner protective frame 1, a connecting plate 5 is fixedly installed on the upper surface of the upper sealing cover 3 on one side, and the outer surfaces of the outer protective frame 2, the upper sealing cover 3 and the connecting plate 5 are coated with anti-corrosion paint.

[0041] As a further solution of the present invention, bolt holes are provided at the edge of the mounting base plate 7, and the bolt holes can cooperate with bolts to fix the mounting base plate 7 on the surface of the floating vessel.

Claims

1. A protection device for a frequency conversion control system of an offshore floating crane, comprising an inner protection frame (1) and a mounting base plate (7), characterized in that: The inner protective frame (1) is provided with two groups, and the two groups are symmetrically arranged and slidably connected to the upper surface of the inner protective frame (1). The two ends of the two groups of the inner protective frames (1) can fit together to form a rectangular annular closed space on the upper surface of the mounting base plate (7). The upper surface of the mounting base plate (7) corresponds to the inner surface of the inner protective frame (1) and is fixedly provided with a built-in curved plate (13). The upper ends of the built-in curved plates (13) are bent toward the direction of the inner protective frame (1). The built-in curved plates (13) are formed by the inner protective frame (1) and the mounting base plate (7). The annular closed space is divided into an outer water storage chamber (17) and an inner installation chamber (18); a waterproof platform (19) is fixedly installed in the inner installation chamber (18); an auxiliary exhaust device is arranged in the waterproof platform (19); a horizontal device is arranged on the upper surface of the waterproof platform (19); a mounting plate (14) is fixedly installed on the upper end of the horizontal device; a control system body (4) is fixedly installed on the upper surface of the mounting plate (14); and the horizontal device can maintain the horizontal state of the upper mounting plate (14) when the mounting bottom plate (7) tilts with the floating vessel; The horizontal device comprises a rotating seat (30), wherein the rotating seat (30) is rotatably mounted on the upper surface of the waterproof platform (19), the upper end of the rotating seat (30) is located above the waterproof platform (19), an electric telescopic rod (29) is fixedly mounted on the upper end of the rotating seat (30), the upper end of the electric telescopic rod (29) is rotatably connected to the mounting plate (14), the mounting plate (14) and the waterproof platform (19) are provided with a plurality of limit springs, the lower end of the rotating seat (30) is located inside the waterproof platform (19), and a connecting rod (32) is fixedly mounted on the lower end of the rotating seat (30), a gravity ball (31) is fixedly mounted on the lower end of the connecting rod (32), a fluorescent mark is provided on the gravity ball (31), and a fluorescent sensing device is provided at the upper end of the waterproof platform (19) and at the edge of the rotating seat (30) corresponding to the rotating seat (30).

2. The protection device for the frequency conversion control system of an offshore floating crane according to claim 1 is characterized in that: The auxiliary exhaust device comprises an intermediate shaft (23) and a mounting shaft (28). The intermediate shaft (23) is rotatably mounted at the middle position of the waterproof platform (19). The mounting shaft (28) is provided with multiple groups and is rotatably mounted on the waterproof platform (19) and is evenly distributed on both sides of the intermediate shaft (23). A ventilation fan (21) is fixedly mounted on the upper end of the mounting shaft (28). A transmission gear (27) is fixedly mounted on the lower end of the mounting shaft (28). A transmission chain (25) is connected to the outer sleeve of the transmission gear (27) on the same side. A side gear (24) is fixedly mounted on the mounting shaft (28) close to the intermediate shaft (23). An intermediate gear (22) is fixedly mounted on the intermediate shaft (23). The intermediate gear (22) is meshed with the side gear (24). A plurality of ventilation slots (20) are evenly arranged on the upper surface of the waterproof platform (19).

3. The protection device for the frequency conversion control system of an offshore floating crane according to claim 2 is characterized in that: An outer protective frame (2) is fixedly mounted on the side of the inner protective frame (1) away from the built-in curved plate (13); a plurality of through holes (6) are provided on the inner protective frame (1) and the outer protective frame (2); a plurality of drainage pipes (8) are fixedly mounted on the lower surface of the outer water storage bin (17); and a one-way valve (26) is fixedly mounted on each of the drainage pipes (8).

4. The protection device for the frequency conversion control system of an offshore floating crane according to claim 3 is characterized in that: The outer protective frame (2) is an L-shaped plate, the long side of the outer protective frame (2) is slightly larger than the long side of the inner protective frame (1), the short side of the outer protective frame (2) is twice the short side of the inner protective frame (1), a positioning piece (9) is fixedly mounted on one end of the long side of the outer protective frame (2) away from the short side thereof, a locking nut (10) is rotatably mounted on both the upper and lower ends of the positioning piece (9), a positioning hole (15) is provided on the outer protective frame (2) at a position corresponding to the locking nut (10), a threaded rod (11) is fixedly mounted on one side of the short side of the outer protective frame (2) away from the long side, the threaded rod (11) corresponds to the position of the positioning hole (15) and is threadably engaged with the locking nut (10).

5. The protection device for the frequency conversion control system of an offshore floating crane according to claim 4 is characterized in that: An embedding groove (16) is provided on one short side of the inner protective frame (1) and away from the long side, and an embedding magnetic block (12) is fixedly mounted on the short side of the inner protective frame (1) away from the embedding groove (16), the embedding magnetic block (12) matches the embedding groove (16), and the magnetism of the embedding magnetic block (12) is opposite to that of the embedding groove (16).

6. The protection device for the frequency conversion control system of an offshore floating crane according to claim 5, characterized in that: An upper sealing cover (3) is fixedly mounted on the upper surface of the inner protective frame (1), a connecting plate (5) is fixedly mounted on the upper surface of the upper sealing cover (3) on one side, and the outer surfaces of the outer protective frame (2), the upper sealing cover (3) and the connecting plate (5) are coated with an anti-corrosion coating.

7. The protection device for the frequency conversion control system of an offshore floating crane according to claim 6 is characterized in that: Bolt holes are provided on the edge of the mounting base plate (7), and the bolt holes can cooperate with bolt nails to fix the mounting base plate (7) on the surface of the floating vessel.

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