A lifting device for ship engine maintenance

Abstract

This invention relates to the field of ship maintenance technology, and in particular to a lifting device for ship engine maintenance. The device includes a mounting base with two sets of clamping arms below it. Two fixed shafts are fixedly connected to the bottom of the mounting base, and the clamping arms are rotatably connected to their corresponding fixed shafts. Two first arc-shaped grooves are formed on adjacent sides of the two clamping arms in the same set. Each first arc-shaped groove contains a first arc-shaped block, and each first arc-shaped block contains two second arc-shaped grooves, each containing a second arc-shaped block. This invention increases the single contact point between a single clamping arm and the shaft surface to multiple points by having multiple second arc-shaped blocks contact and adhere to the shaft surface. When lifting the shaft, the force at a single point is distributed to multiple second arc-shaped blocks, reducing local pressure on the shaft surface, avoiding journal indentations caused by localized stress, and ensuring the smoothness and precision of the shaft surface.

Description

Technical Field

[0001] This invention relates to the field of ship maintenance technology, and in particular to a lifting device for ship engine maintenance. Background Technology

[0002] Marine engineering is a collective term for the machinery, equipment, and systems configured to meet the needs of navigation, operation, living, and safety of a ship, encompassing power, piping, emergency, and automation devices. Its core is the ship's power plant, which typically consists of seven main parts: propulsion system, auxiliary power system, piping system, deck machinery, pollution prevention equipment, emergency equipment, and automation equipment. The propulsion system includes the main engine, shafting, and propellers, while auxiliary systems provide energy support such as electricity and heat.

[0003] Patent document CN218754597U discloses an adjustable lifting device for ship repair parts. The adjustable lifting device for ship repair parts includes a base plate, a movable wheel fixedly connected to the bottom of the base plate, a vertical pole fixedly connected to the top of the base plate, a top plate fixedly connected to the top of the vertical pole, a stabilizing mechanism provided on one side of the vertical pole, a hydraulic lifting cylinder fixedly connected to the inner cavity of the top plate, a connecting plate fixedly connected to the piston rod of the hydraulic lifting cylinder, and a fixing mechanism provided at the bottom of the connecting plate.

[0004] In existing technologies, lifting devices typically clamp and fix the object to be lifted before vertical lifting. When clamping and lifting large shafts such as intermediate shafts or propeller shafts in turbines, the contact points between the clamping jaws and the journals are few, resulting in excessive local compressive stress on the shaft. Consequently, the contact points between the shaft and the clamping jaws are easily damaged during the lifting process, affecting the surface accuracy of the shaft. Furthermore, when the lifting point is not at the center of gravity of the shaft, the shaft is prone to axial movement within the jaws, affecting the safety of the lifting. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a lifting device for ship engine maintenance.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a lifting device for ship engine maintenance, comprising a mounting base, two sets of clamping arms are arranged below the mounting base, each set having two clamping arms arranged opposite to each other, two fixed shafts are fixedly connected to the bottom of the mounting base, the clamping arms are rotatably connected to the corresponding fixed shafts, two first arc-shaped grooves are opened on adjacent sides of the two clamping arms in the same set, a first arc-shaped block is arranged inside the first arc-shaped groove, two second arc-shaped grooves are opened on the first arc-shaped block, a second arc-shaped block is arranged inside the second arc-shaped groove, a first limiting component is arranged inside the first arc-shaped groove, and a second limiting component is arranged inside the second arc-shaped groove;

[0007] The mounting base is equipped with a drive assembly that drives the two clamping arms in the same group to move closer together. The top of the mounting base is equipped with a lifting suspension assembly. Both ends of the bottom of the mounting base are equipped with damping plates. The bottom of the damping plates has multiple anti-slip grooves. The mounting base is equipped with a cooperating moving assembly. When the drive assembly drives the two clamping arms in the same group to move closer together, the cooperating moving assembly drives the two damping plates to descend vertically.

[0008] Preferably, the drive assembly includes a lifting bracket, which is disposed at the bottom of the mounting base. Two first limiting pins are fixedly connected to the lifting bracket, and the first limiting pins are slidably inserted into the mounting base. A hydraulic cylinder is fixedly installed on the top of the mounting base, and the piston shaft of the hydraulic cylinder is fixedly connected to the top of the lifting bracket. Two first circular pins are fixedly connected to both ends of the lifting bracket. Limiting strips are fixedly connected to the clamping arms, and each limiting strip has a first groove. The first circular pins are respectively located inside the corresponding first grooves.

[0009] Preferably, the moving component includes two movable plates, both of which are located at the bottom of the mounting base and above the corresponding damping plate. Multiple second limiting pins are slidably inserted into the movable plates, and the second limiting pins are fixedly connected to the mounting base. Two mounting brackets are fixedly connected to the bottom of the mounting base. The mounting brackets are rotatably connected to the interior of each mounting bracket. Two second strip grooves are opened on the rotating strips. Second circular pins are fixedly connected to the movable plates, and one end of the second circular pin and the corresponding first circular pin are respectively located inside the two second strip grooves.

[0010] The top of the damping plate is fixedly connected with multiple third limit pins, which are slidably inserted into the corresponding movable plates. Each third limit pin is fitted with a first spring, which is fixedly connected between the corresponding damping plate and the movable plate.

[0011] Preferably, each of the two arc-shaped blocks has two contact strips fixedly connected to its flat end, and the contact strips are all arc-shaped structures.

[0012] Preferably, each clamping arm is fixedly connected to a strip slide rail, a sliding housing is slidably connected to the strip slide rail, a U-shaped housing is fixedly connected to the sliding housing, a cleaning brush is fixedly connected to the U-shaped housing, and a connecting rod is provided between the sliding housing and the mounting base, with both ends of the connecting rod rotatably connected to the sliding housing and the mounting base respectively.

[0013] Preferably, the sliding housing and the corresponding U-shaped housing are interconnected. The U-shaped housing has multiple connecting holes. The cleaning brush contacts and connects with the corresponding connecting holes. The sliding housing is fixedly connected to a liquid inlet pipe. The clamping arms are all fixedly connected to a tapered tube. The top of the mounting base is fixedly connected to an annular liquid storage tank. The annular liquid storage tank stores organic oil solution. The annular liquid storage tank and the corresponding tapered tube are fixedly connected to a connecting hose. The tapered tube is equipped with a sealing component inside.

[0014] Preferably, the sealing assembly includes a limiting bracket, which is fixedly connected to the inside of the tapered tube. A fourth limiting pin is slidably inserted into the limiting bracket. A tapered sealing block is fixedly connected to the bottom end of the fourth limiting pin. The tapered sealing block contacts and fits against the tapered inner wall of the tapered tube. A contact ring is fixedly connected to the bottom of the tapered sealing block. A communicating groove is opened on the contact ring. A second spring is sleeved on the fourth limiting pin. The second spring is fixedly connected between the tapered sealing block and the limiting bracket.

[0015] Preferably, the oil solvent is a hydrocarbon cleaning agent.

[0016] Preferably, the first limiting component includes a first arc-shaped slide rail, the first arc-shaped slide rail is fixedly connected to the inside of the first arc-shaped groove, the first arc-shaped block is slidably connected to the first arc-shaped slide rail, the first arc-shaped slide rail is provided with a first limiting groove, the center of the first arc-shaped block is threaded with a first threaded pin, and one end of the first threaded pin is located inside the corresponding first limiting groove.

[0017] The second limiting component includes a second arc-shaped slide rail, which is fixedly connected inside the second arc-shaped groove. A second arc-shaped block is slidably connected to the second arc-shaped slide rail. A second limiting groove is provided on each of the second arc-shaped slide rails. A second threaded pin is threadedly connected to the center of the second arc-shaped block, and one end of the second threaded pin is located inside the corresponding second limiting groove.

[0018] Preferably, the lifting suspension assembly includes a fixed arm, which is fixedly connected to the top of the mounting base, and a lifting ring is fixedly connected to the top of the fixed arm.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. When the two clamping arms in the same group are in the closed state, multiple second arc-shaped blocks are in contact with the surface of the shaft, increasing the number of single contact points between a single clamping arm and the surface of the shaft to multiple, with the number of increases being the same as the number of second arc-shaped blocks on a single clamping arm. Thus, when the shaft is lifted, the force at a single point is distributed to multiple second arc-shaped blocks, reducing the local pressure on the surface of the shaft, avoiding journal indentations caused by localized forces, and ensuring the smoothness and precision of the shaft surface;

[0021] 2. When multiple second arc-shaped blocks support the bottom of the shaft, two damping plates press against the top of the shaft, so that the shaft is in a clamped state of being subjected to forces from both above and below, rather than a single bottom-supported state. When the lifting point is not at the center of gravity of the shaft, the anti-slip groove at the bottom of the damping plate increases the friction during contact and compression, preventing the shaft from moving axially and ensuring the safety of lifting.

[0022] 3. When the two clamping arms in the same group come together, the cleaning brush moves along the corresponding surface of the second arc-shaped block and brushes and cleans the surface of multiple second arc-shaped blocks. When the two clamping arms in the same group move away from each other, the sliding housing returns to the initial position along the strip slide rail. When the clamping arm completes a single reciprocating movement, the cleaning brush scrapes the surface of multiple second arc-shaped blocks once and removes the oil and debris adhering to the surface of the second arc-shaped blocks. This ensures that the second arc-shaped blocks are in the best friction state when in contact with the shaft and prevents hard impurities on the surface of the second arc-shaped blocks from being squeezed and forming scratches on the shaft. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the first structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the second structure of the present invention;

[0025] Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the diagram;

[0026] Figure 4 This is a schematic diagram of the third structure of the present invention;

[0027] Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the structure at point B in the diagram;

[0028] Figure 6 For the present invention Figure 4 Enlarged schematic diagram of the structure at point C;

[0029] Figure 7 This is a schematic diagram of the mating structure of the damping plate, lifting bracket, and movable plate of the present invention;

[0030] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at point D;

[0031] Figure 9 This is a cross-sectional schematic diagram of the clamping arm, the first arc-shaped block, and the second arc-shaped block mating structure of the present invention;

[0032] Figure 10 For the present invention Figure 9 Enlarged schematic diagram of the structure at point E in the diagram;

[0033] Figure 11 This is a schematic cross-sectional view of the sliding housing, U-shaped housing, and cleaning brush assembly structure of the present invention;

[0034] Figure 12 This is a cross-sectional schematic diagram of the structure of the tapered tube and tapered sealing block of the present invention.

[0035] In the diagram: 1. Mounting base; 2. Clamping arm; 3. Fixed shaft; 4. First arc-shaped groove; 5. First arc-shaped block; 6. Second arc-shaped groove; 7. Second arc-shaped block; 8. Damping plate; 9. Lifting bracket; 10. First limit pin; 11. Hydraulic cylinder; 12. First circular pin; 13. Limiting strip; 14. First strip groove; 15. Movable plate; 16. Second limit pin; 17. Mounting bracket; 18. Tilting strip; 19. Second strip groove; 20. Second circular pin; 21. Third limit pin; 22. First spring; 23. Contact strip; 24. Strip slide rail 25. Sliding housing; 26. U-shaped housing; 27. Cleaning brush; 28. Connecting rod; 29. ​​Communicating hole; 30. Liquid inlet pipe; 31. Conical tube; 32. Annular liquid storage tank; 33. Communicating hose; 34. Limiting bracket; 35. Fourth limiting pin; 36. Conical sealing block; 37. Contact ring; 38. Communicating groove; 39. Second spring; 40. First arc-shaped slide rail; 41. First limiting groove; 42. First threaded pin; 43. Second arc-shaped slide rail; 44. Second limiting groove; 45. Second threaded pin; 46. Fixed arm; 47. Lifting ring. Detailed Implementation

[0036] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0037] like Figures 1 to 12 The lifting device for ship engine maintenance shown includes a mounting base 1. Two sets of clamping arms 2 are arranged below the mounting base 1. Each set of clamping arms 2 consists of two arms arranged opposite each other. Two fixed shafts 3 are fixedly connected to the bottom of the mounting base 1. The clamping arms 2 are rotatably connected to the corresponding fixed shafts 3. Two first arc-shaped grooves 4 are opened on the adjacent side of the two clamping arms 2 in the same set. A first arc-shaped block 5 is arranged inside the first arc-shaped groove 4. Two second arc-shaped grooves 6 are opened on the first arc-shaped block 5. A second arc-shaped block 7 is arranged inside the second arc-shaped groove 6. A first limiting component is arranged inside the first arc-shaped groove 4. A second limiting component is arranged inside the second arc-shaped groove 6.

[0038] The mounting base 1 is equipped with a drive assembly that drives the two clamping arms 2 of the same group to move closer together. The top of the mounting base 1 is equipped with a lifting suspension assembly. Both ends of the bottom of the mounting base 1 are equipped with damping plates 8. Multiple anti-slip grooves are opened at the bottom of the damping plates 8. The mounting base 1 is equipped with a cooperating moving assembly. When the drive assembly drives the two clamping arms 2 of the same group to move closer together, the cooperating moving assembly drives the two damping plates 8 to descend vertically.

[0039] The lifting rope is connected to the mounting base 1 via the lifting suspension assembly. The mounting base 1 is then transported to the top of the shaft via the release of the rope, positioning the shaft between the two clamping arms 2 in the same group. Next, the two clamping arms 2 are driven closer together by the drive assembly. As the clamping arms 2 approach the shaft surface, multiple second arc-shaped blocks 7 contact and press against the shaft surface, sliding along the inside of the second arc-shaped groove 6 during the contact process. This adjusts the contact angle between the second arc-shaped blocks 7 and the shaft surface. Simultaneously, the corresponding first arc-shaped blocks 5 move along... The corresponding first arc groove 4 slides inside, so that when the two clamping arms 2 in the same group are in the closed state, multiple second arc blocks 7 are in contact with the shaft surface, increasing the number of single contact points between a single clamping arm 2 and the shaft surface to multiple, the number of which is the same as the number of second arc blocks 7 on a single clamping arm 2. Thus, when the shaft is lifted, the single point of force is distributed to multiple second arc blocks 7, reducing the local pressure on the shaft surface, avoiding journal indentations caused by local force, and ensuring the smoothness and precision of the shaft surface.

[0040] When the two clamping arms 2 in the same group close, the moving component drives the two damping plates 8 to descend vertically and contact the top of the shaft. Thus, while multiple second arc-shaped blocks 7 support the bottom of the shaft, the two damping plates 8 press against the top of the shaft, so that the shaft is in a clamping state with forces from both above and below, rather than a single bottom support state. When the lifting point is not at the center of gravity of the shaft, the anti-slip groove at the bottom of the damping plate 8 increases the friction during contact and compression, preventing the shaft from moving axially and ensuring the safety of lifting.

[0041] As a further embodiment of the present invention, the drive assembly includes a lifting bracket 9, which is disposed at the bottom of the mounting base 1. Two first limiting pins 10 are fixedly connected to the lifting bracket 9, and the first limiting pins 10 are slidably inserted into the mounting base 1. A hydraulic cylinder 11 is fixedly installed on the top of the mounting base 1, and the piston shaft of the hydraulic cylinder 11 is fixedly connected to the top of the lifting bracket 9. Two first circular pins 12 are fixedly connected to both ends of the lifting bracket 9. Limiting strips 13 are fixedly connected to both clamping arms 2, and first strip grooves 14 are opened on both limiting strips 13. The first circular pins 12 are respectively located inside the corresponding first strip grooves 14.

[0042] When the piston shaft of the hydraulic cylinder 11 moves upward, it drives the lifting bracket 9 to rise synchronously. The first limiting pin 10 on the lifting bracket 9 moves along the sliding insertion of the mounting base 1 and limits the movement of the lifting bracket 9. The lifting bracket 9 drives the first circular pins 12 at both ends to rise. The first circular pin 12 is limited by the first slot 14, causing the limiting strip 13 to drive the clamping arm 2 to flip along the rotation connection of the fixed shaft 3. This causes the two clamping arms 2 in the same group to come closer to each other and limit the shaft. After the bottom ends of the two clamping arms 2 in the same group come closer, they are in contact with each other, forming a U-shaped structure. This encloses the shaft in the U-shaped structure. During the lifting process, the shaft contacts and squeezes multiple second arc blocks 7 by its own weight. This causes the multiple second arc blocks 7 to adjust their angles under pressure and come into contact with the shaft. When the piston shaft of the hydraulic cylinder 11 moves downward, it drives the two clamping arms 2 in the same group to move away from each other and release the limiting effect on the shaft.

[0043] As a further embodiment of the present invention, the movable component includes two movable plates 15, both of which are disposed at the bottom of the mounting base 1 and above the corresponding damping plate 8. Multiple second limiting pins 16 are slidably inserted on the movable plates 15, and the second limiting pins 16 are fixedly connected to the mounting base 1. Two mounting brackets 17 are fixedly connected to the bottom of the mounting base 1. The interior of each mounting bracket 17 is rotatably connected to a flip bar 18. Two second strip grooves 19 are formed on the flip bar 18. A second circular pin 20 is fixedly connected to the movable plate 15. One end of the second circular pin 20 and the corresponding first circular pin 12 are respectively located inside the two second strip grooves 19.

[0044] Multiple third limiting pins 21 are fixedly connected to the top of the damping plate 8. The third limiting pins 21 are slidably inserted into the corresponding movable plate 15. Each third limiting pin 21 is fitted with a first spring 22. The first spring 22 is fixedly connected between the corresponding damping plate 8 and the movable plate 15.

[0045] When the lifting bracket 9 drives the first circular pin 12 to rise, the corresponding second strip groove 19 limits the first circular pin 12, causing the flip bar 18 to rotate along the rotating connection of the mounting bracket 17. The second circular pin 20 is also limited by another second strip groove 19, causing the movable plate 15 to move downwards along the sliding connection of the second limiting pin 16, and simultaneously driving the damping plate 8 to descend. After the damping plate 8 contacts the top of the shaft, the movable plate 15 continues to move downwards, bringing the damping plate 8 and the movable plate 15 closer together. The third limiting pin 21 at the top of the damping plate 8 moves along the sliding connection of the movable plate 15 and compresses the first spring 22, causing compression deformation. The compression of the first spring 22 increases the contact pressure between the damping plate 8 and the shaft, thereby increasing friction and preventing axial movement of the shaft.

[0046] As a further embodiment of the present invention, two contact strips 23 are fixedly connected to the planar ends of the second arc-shaped block 7, and the contact strips 23 are all arc-shaped structures;

[0047] By fixing two arc-shaped contact strips 23 to the flat end of the second arc-shaped block 7, the contact strips 23 replace the second arc-shaped block 7 in contact with the shaft, and increase the single contact between the second arc-shaped block 7 and the shaft to two, thereby further increasing the contact area during lifting.

[0048] As a further embodiment of the present invention, each clamping arm 2 is fixedly connected to a strip slide rail 24, a sliding housing 25 is slidably connected to the strip slide rail 24, a U-shaped housing 26 is fixedly connected to the sliding housing 25, a cleaning brush 27 is fixedly connected to the U-shaped housing 26, and a connecting rod 28 is provided between the sliding housing 25 and the mounting base 1, with both ends of the connecting rod 28 rotatably connected to the sliding housing 25 and the mounting base 1 respectively;

[0049] When the two clamping arms 2 in the same group rotate and move closer together along the rotational connection of the fixed shaft 3, the clamping arms 2 drive the sliding housing 25 and the U-shaped housing 26 to move synchronously. During the movement of the sliding housing 25, the two ends of the connecting rod 28 rotate along the rotational connection between the sliding housing 25 and the mounting base 1. Since the length of the connecting rod 28 remains unchanged, when the clamping arms 2 move away from the rotational connection between the connecting rod 28 and the mounting base 1, the sliding housing 25 slides along the surface of the strip rail 24, and drives the U-shaped housing 26 and the cleaning brush 27 to move together, thereby moving the two clamping arms in the same group. When the holding arms 2 come together, the cleaning brush 27 moves along the surface of the corresponding second arc-shaped block 7 and brushes and cleans the surfaces of multiple second arc-shaped blocks 7. When the two holding arms 2 in the same group move away from each other, the sliding housing 25 returns to the initial position along the strip slide rail 24. When the holding arm 2 completes a single reciprocating movement, the cleaning brush 27 scrapes the surfaces of multiple second arc-shaped blocks 7 once and removes the oil and debris adhering to the surfaces of the second arc-shaped blocks 7. This ensures that the second arc-shaped blocks 7 are in the best friction state when in contact with the shaft and prevents hard impurities on the surface of the second arc-shaped blocks 7 from being squeezed and forming scratches on the shaft.

[0050] As a further embodiment of the present invention, the sliding housing 25 is interconnected with the corresponding U-shaped housing 26, and the U-shaped housing 26 is provided with a plurality of connecting holes 29 (e.g., Figure 11 As shown), the cleaning brush 27 contacts and communicates with the corresponding communicating hole 29, and the sliding housing 25 is fixedly connected to the liquid inlet pipe 30 (as shown). Figure 6 As shown), a tapered tube 31 is fixedly connected to each clamping arm 2, and an annular liquid storage tank 32 is fixedly connected to the top of the mounting base 1. The annular liquid storage tank 32 stores organic oil solution. A connecting hose 33 is fixedly connected between the annular liquid storage tank 32 and the corresponding tapered tube 31. A sealing component is provided inside the tapered tube 31.

[0051] When the two clamping arms 2 in the same group approach each other, the sliding housing 25 slides along the strip slide rail 24 and approaches the corresponding conical tube 31. When the two clamping arms 2 in the same group are in contact, the liquid inlet pipe 30 on the sliding housing 25 enters the interior of the conical tube 31 and releases the sealing effect of the sealing component on the conical tube 31. The oil dissolving liquid inside the annular reservoir 32 flows into the interior of the conical tube 31 along the corresponding connecting hose 33, and enters the liquid inlet pipe 30 from the interior of the conical tube 31. Then it enters the U-shaped housing 26 along the sliding housing 25, and finally flows out along the connecting hole 29 and wets the cleaning brush 27, thereby dissolving the oil stains on the surface of the cleaning brush 27, reducing the impact of oil stain accumulation on cleaning, and ensuring the cleaning efficiency of the cleaning brush 27.

[0052] When the two clamping arms 2 in the same group move away from each other, the inlet pipe 30 disengages from the inside of the tapered tube 31, and the sealing assembly seals the inside of the tapered tube 31 again, reducing the waste of oil solvent.

[0053] As a further embodiment of the present invention, the sealing assembly includes a limiting bracket 34, which is fixedly connected to the inside of the tapered tube 31. A fourth limiting pin 35 is slidably inserted on the limiting bracket 34. A tapered sealing block 36 is fixedly connected to the bottom end of the fourth limiting pin 35. The tapered sealing block 36 contacts and fits against the tapered inner wall of the tapered tube 31. A contact ring 37 is fixedly connected to the bottom of the tapered sealing block 36. A communicating groove 38 is opened on the contact ring 37. A second spring 39 is sleeved on the fourth limiting pin 35. The second spring 39 is fixedly connected between the tapered sealing block 36 and the limiting bracket 34.

[0054] The second spring 39, acting elastically, compresses the conical sealing block 36, causing it to contact and adhere to the conical inner wall of the conical tube 31, preventing the oil solution from flowing out. When the inlet pipe 30 enters the conical tube 31, it compresses the contact ring 37, which in turn moves the conical sealing block 36 along the inside of the conical tube 31. This causes the fourth limiting pin 35 to move along the sliding joint of the limiting bracket 34 and compress the second spring 39, causing it to deform. The oil solution flows into the connecting groove 38 through the gap between the conical tube 31 and the conical sealing block 36, and then enters the inlet pipe 30 along the connecting groove 38. When the inlet pipe 30 detaches from the inside of the conical tube 31, the second spring 39, acting elastically, compresses the conical sealing block 36 to reset, and re-seales the conical tube 31.

[0055] As a further embodiment of the present invention, the oil dissolving agent is a hydrocarbon cleaning agent;

[0056] Hydrocarbon cleaners can quickly dissolve various oil stains such as engine oil, cutting oil, and rust inhibitors, and their chemical composition is stable and will not damage metal shafts.

[0057] As a further embodiment of the present invention, the first limiting component includes a first arc-shaped slide rail 40, the first arc-shaped slide rail 40 being fixedly connected inside the first arc-shaped groove 4 (e.g., Figure 10 As shown), the first arc-shaped block 5 is slidably connected to the first arc-shaped slide rail 40. The first arc-shaped slide rail 40 is provided with a first limiting groove 41. The center of the first arc-shaped block 5 is threadedly connected to a first threaded pin 42. One end of the first threaded pin 42 is located inside the corresponding first limiting groove 41.

[0058] The second limiting component includes a second arc-shaped slide rail 43, which is fixedly connected to the inside of the second arc-shaped groove 6. The second arc-shaped block 7 is slidably connected to the second arc-shaped slide rail 43. The second arc-shaped slide rail 43 is provided with a second limiting groove 44. A second threaded pin 45 is threadedly connected to the center of the second arc-shaped block 7. One end of the second threaded pin 45 is located inside the corresponding second limiting groove 44.

[0059] The first arc-shaped block 5 is slidably connected to the first arc-shaped slide rail 40. The sliding connection of the first arc-shaped slide rail 40 allows the first arc-shaped block 5 to move along the inside of the first arc-shaped groove 4. The first limiting groove 41 blocks one end of the first threaded pin 42, limiting the sliding distance of the first arc-shaped block 5 and preventing the first arc-shaped block 5 from detaching from the inside of the first arc-shaped groove 4. The limiting principle of the second arc-shaped block 7 inside the second arc-shaped groove 6 is the same as above.

[0060] As a further embodiment of the present invention, the lifting suspension assembly includes a fixed arm 46, which is fixedly connected to the top of the mounting base 1, and a lifting ring 47 is fixedly connected to the top of the fixed arm 46.

[0061] One end of the hoisting rope is passed through the hoisting ring 47 and wrapped around the rope itself to form a closed loop. During the hoisting process, the rope is wrapped tighter and tighter around the hoisting ring 47 by the gravity generated during the hoisting, thereby preventing the rope from moving around on the hoisting ring 47.

[0062] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A hoisting device for ship's engine overhauls, comprising a mounting base (1), characterized in that, Two sets of clamping arms (2) are provided below the mounting base (1). Each set of clamping arms (2) consists of two arms and is arranged opposite to each other. Two fixed shafts (3) are fixedly connected to the bottom of the mounting base (1). The clamping arms (2) are rotatably connected to the corresponding fixed shafts (3). Two first arc-shaped grooves (4) are opened on the adjacent side of the two clamping arms (2) in the same set. A first arc-shaped block (5) is provided inside the first arc-shaped groove (4). Two second arc-shaped grooves (6) are opened on the first arc-shaped block (5). A second arc-shaped block (7) is provided inside the second arc-shaped groove (6). A first limiting component is provided inside the first arc-shaped groove (4), and a second limiting component is provided inside the second arc-shaped groove (6). The mounting base (1) is provided with a drive assembly that drives the two clamping arms (2) of the same group to move closer together. The top of the mounting base (1) is provided with a lifting suspension assembly. Both ends of the bottom of the mounting base (1) are provided with damping plates (8). Multiple anti-slip grooves are provided at the bottom of the damping plates (8). The mounting base (1) is provided with a cooperating moving assembly. When the drive assembly drives the two clamping arms (2) of the same group to move closer together, the cooperating moving assembly drives the two damping plates (8) to descend vertically. The drive assembly includes a lifting bracket (9), which is located at the bottom of the mounting base (1). Two first limit pins (10) are fixedly connected to the lifting bracket (9). The first limit pins (10) are slidably inserted into the mounting base (1). A hydraulic cylinder (11) is fixedly installed on the top of the mounting base (1). The piston shaft of the hydraulic cylinder (11) is fixedly connected to the top of the lifting bracket (9). Two first circular pins (12) are fixedly connected to both ends of the lifting bracket (9). Limiting strips (13) are fixedly connected to the clamping arms (2). First slots (14) are opened on the limiting strips (13). The first circular pins (12) are located inside the corresponding first slots (14). The movable component includes two movable plates (15), both of which are located at the bottom of the mounting base (1) and above the corresponding damping plate (8). Multiple second limit pins (16) are slidably inserted on the movable plates (15), and the second limit pins (16) are fixedly connected to the mounting base (1). Two mounting brackets (17) are fixedly connected to the bottom of the mounting base (1). Rotating strips (18) are rotatably connected inside the mounting brackets (17). Two second strip grooves (19) are opened on the rotating strips (18). A second circular pin (20) is fixedly connected to the movable plate (15). One end of the second circular pin (20) and the corresponding first circular pin (12) are respectively located inside the two second strip grooves (19). Multiple third limiting pins (21) are fixedly connected to the top of the damping plate (8). The third limiting pins (21) are slidably inserted into the corresponding movable plate (15). Each third limiting pin (21) is fitted with a first spring (22). The first spring (22) is fixedly connected between the corresponding damping plate (8) and the movable plate (15). Each clamping arm (2) is fixedly connected to a strip slide rail (24), a sliding housing (25) is slidably connected to the strip slide rail (24), a U-shaped housing (26) is fixedly connected to the sliding housing (25), a cleaning brush (27) is fixedly connected to the U-shaped housing (26), and a connecting rod (28) is provided between the sliding housing (25) and the mounting base (1). The two ends of the connecting rod (28) are respectively rotatably connected to the sliding housing (25) and the mounting base (1).

2. The lifting device for ship engine maintenance according to claim 1, characterized in that, The flat end of the second arc block (7) is fixedly connected to two contact strips (23), and the contact strips (23) are all arc-shaped structures.

3. A lifting device for ship engine maintenance according to claim 1, characterized in that, The sliding housing (25) is connected to the corresponding U-shaped housing (26). The U-shaped housing (26) has multiple connecting holes (29). The cleaning brush (27) is in contact with the corresponding connecting hole (29). The sliding housing (25) is fixedly connected to the liquid inlet pipe (30). The clamping arm (2) is fixedly connected to the tapered tube (31). The top of the mounting base (1) is fixedly connected to the annular liquid storage tank (32). The annular liquid storage tank (32) stores organic oil solution. The annular liquid storage tank (32) and the corresponding tapered tube (31) are fixedly connected to the connecting hose (33). The tapered tube (31) is equipped with a sealing component inside.

4. A lifting device for ship engine maintenance according to claim 3, characterized in that, The sealing assembly includes a limiting bracket (34), which is fixedly connected to the inside of the tapered tube (31). A fourth limiting pin (35) is slidably inserted on the limiting bracket (34). A tapered sealing block (36) is fixedly connected to the bottom end of the fourth limiting pin (35). The tapered sealing block (36) is in contact with the tapered inner wall of the tapered tube (31). A contact ring (37) is fixedly connected to the bottom of the tapered sealing block (36). A connecting groove (38) is opened on the contact ring (37). A second spring (39) is sleeved on the fourth limiting pin (35). The second spring (39) is fixedly connected between the tapered sealing block (36) and the limiting bracket (34).

5. A lifting device for ship engine maintenance according to claim 3, characterized in that, The engine oil solvent is a hydrocarbon cleaning agent.

6. A lifting device for ship engine maintenance according to claim 1, characterized in that, The first limiting component includes a first arc-shaped slide rail (40), which is fixedly connected to the inside of the first arc-shaped groove (4), and a first arc-shaped block (5) is slidably connected to the first arc-shaped slide rail (40). The first arc-shaped slide rail (40) is provided with a first limiting groove (41), and a first threaded pin (42) is threadedly connected to the center of the first arc-shaped block (5). One end of the first threaded pin (42) is located inside the corresponding first limiting groove (41). The second limiting component includes a second arc-shaped slide rail (43), which is fixedly connected inside the second arc-shaped groove (6). A second arc-shaped block (7) is slidably connected to the second arc-shaped slide rail (43). A second limiting groove (44) is provided on each of the second arc-shaped slide rails (43). A second threaded pin (45) is threadedly connected to the center of the second arc-shaped block (7). One end of the second threaded pin (45) is located inside the corresponding second limiting groove (44).

7. A lifting device for ship engine maintenance according to claim 1, characterized in that, The lifting suspension assembly includes a fixed arm (46), which is fixedly connected to the top of the mounting base (1), and a lifting ring (47) is fixedly connected to the top of the fixed arm (46).

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