A ship crane with a cable limiting mechanism

Abstract

This invention relates to the field of crane technology, specifically to a marine crane with a cable limiting mechanism. The crane includes a marine crane mounting frame, a crane base fixedly mounted on top of the mounting frame, and a telescopic boom movably mounted on top of the crane base. The advantages are as follows: by improving the boom head assembly and hook assembly, the boom head assembly limits the movement of the cable from both sides individually through a cable swing balance frame and a cable limiting frame. The cable swing balance frame and the cable limiting frame are hinged. As the hook assembly sways, the cable twists, causing the cable swing balance frame and cable limiting frame to swing. The cable swing balance frame deflects freely with the cable and, through the cooperation of an inclined wing plate and a spring telescopic sleeve, promptly drives the upper cable reset push plate. This allows the cable reset push plate to provide compensating support against the reverse torsional offset of the cable, achieving timely dynamic balancing of the cable's torsion caused by swaying.

Description

Technical Field

[0001] This invention belongs to the field of crane technology, specifically relating to a ship crane with a cable limiting mechanism. Background Technology

[0002] As a key piece of equipment in marine operations, ship cranes undertake important tasks such as cargo lifting and transfer. Cable limiting structures, as an important component of cranes, primarily function to ensure that cables move within a specified range, preventing excessive stretching, wear, or entanglement, thereby ensuring the safe and stable operation of the crane. In existing technologies, cable limiting typically employs physical limiting methods, such as setting limit rails or blocks, to control the range of cable movement and reduce the risk of cargo swaying. However, these limiting structures rely excessively on the rigid limiting of the cable itself, seriously neglecting the impact of cargo swaying during lifting. Once the cargo sways, it will cause the cable to have torsional force. Traditional rigid limiting structures will generate severe friction with the cable when the cable twists and deviates, which is not only detrimental to cable movement but also causes cable wear, affecting the cable's service life.

[0003] A Chinese patent document with publication number CN119750377B proposes a guide rail structure for a ship crane. By designing auxiliary components, when the heavy object is in front of the guide rail assembly, a first motor can be driven to rotate counterclockwise through a bevel gear set, driving a lead screw to move the moving plate backward within the track groove. At this time, the two sets of third springs on the front side will have their stroke extended, while the two sets of third springs on the back side will have their stroke contracted. As a result, the first guide rail on the front side will be subjected to a stronger pulling force. The above-mentioned technical problem is solved by mechanically adjusting the pulling force. However, the response of the motor, lead screw, and spring system in the above method has the problem of mechanical inertia and control delay. When the cargo suddenly shakes in the opposite direction, the system may not have time to adjust in the opposite direction, resulting in a brief "opposition" between the pulling force direction and the shaking direction, which will aggravate the impact on the cable.

[0004] Therefore, this invention proposes a ship crane with a cable limiting mechanism to solve the problem that existing technologies using mechanical adjustment of the pulling force have mechanical inertia and control delays, which can lead to a brief "opposition" between the pulling force direction and the swaying direction, exacerbating cable impact. The invention adopts a cable swing balance frame design, which not only limits the longitudinal movement of the cable but also allows for timely and free dynamic adjustment as the cable swings. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a ship crane with a cable limiting mechanism to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a ship crane with a cable limiting mechanism, comprising a ship crane mounting frame, a crane base fixedly mounted on the upper part of the ship crane mounting frame, a telescopic boom movably mounted on the upper part of the crane base, a lifting and unwinding device provided on one side of the telescopic boom, a cable provided on the outer surface of the lifting and unwinding device, a boom head assembly fixedly mounted on one end of the telescopic boom, a hook assembly provided below the boom head assembly, a fixed pulley provided above the boom head assembly, a cable swing balancing frame provided below the boom head assembly, a cable limiting frame provided on one side of the cable swing balancing frame, a cable reset push plate provided above the cable swing balancing frame, spring telescopic sleeves symmetrically fixedly mounted on the inner surface of the boom head assembly, a pulley rotatably mounted below the inner surface of the hook assembly, and a tension adjustment plate provided above the pulley.

[0007] Preferably, the outer surface of the fixed pulley is in contact with the outer surface of the cable. A swing support frame is provided below the side of the cable swing balance frame near the cable limiting frame, and a swing limiting frame is provided below the other side of the cable swing balance frame. Both ends of the swing limiting frame and the swing support frame are fixedly connected to the inner surface of the arm head assembly. The lower surface of the cable swing balance frame near the cable limiting frame is rotatably connected to the middle of the swing support frame, and the lower surface of the other side of the cable swing balance frame is slidably connected to the inner surface of the swing limiting frame.

[0008] Preferably, a sloping wing plate is symmetrically fixedly installed on the outer surface of the cable swing balance frame, and a return spring rod is provided on one side of the sloping wing plate. One end of the sleeve of the return spring rod is fixedly connected to the side surface of the arm head assembly, and one end of the telescopic rod of the return spring rod contacts one side surface of the sloping wing plate.

[0009] Preferably, the upper end of the cable limiting frame is hinged to the side surface of the cable swing balance frame, and a small cam and a grooved wheel are rotatably installed inside the cable limiting frame. The small cam and the grooved wheel are size-matched, and the outer surfaces of the small cam and the grooved wheel are in contact with the outer surface of the cable, respectively.

[0010] Preferably, inclined wing plates two are symmetrically fixedly installed on the outer surface of the cable reset push plate, and a reset spring rod two is provided on one side of the inclined wing plate two. One end of the sleeve of the reset spring rod two is fixedly connected to the side surface of the arm head assembly, and one end of the telescopic rod of the reset spring rod two is fixedly connected to the side surface of the inclined wing plate two.

[0011] Preferably, a double-headed inclined telescopic rod is slidably installed inside the spring telescopic sleeve, and a spring is fixedly installed inside the spring telescopic sleeve. One end of the spring is fixedly connected to the pad surface of the double-headed inclined telescopic rod. The upper inclined surface of the double-headed inclined telescopic rod contacts the lower surface of the second inclined wing plate, and the lower inclined surface of the double-headed inclined telescopic rod contacts the upper surface of the first inclined wing plate.

[0012] Preferably, a large positioning cam is rotatably mounted in the middle of the inner surface of the cable swing balance frame, a positioning recess is fixedly mounted on one side of the inner surface of the cable swing balance frame, lubricating nozzles are symmetrically fixedly mounted on both sides of the inner surface of the positioning recess, lubricating balls are movably mounted inside the lubricating nozzles, a buffer plate is fixedly mounted in the middle of the inner surface of the positioning recess, and the side surfaces of the buffer plate and the large positioning cam are in contact with the outer surface of the cable.

[0013] Preferably, a hook is fixedly installed at the bottom of the hook assembly, the outer surface of the pulley is in contact with the outer surface of the cable, and a tensioning wheel is movably installed inside the hook assembly near the cable limiting frame, the outer surface of the tensioning wheel being in contact with the outer surface of the cable.

[0014] Preferably, one side surface of the tension adjustment plate is fixedly mounted on the inner surface of the hook assembly, the other side surface of the tension adjustment plate is provided with a diamond-shaped frame, and an adjustment slider is slidably mounted on the inner surface of the tension adjustment plate. The end of the diamond-shaped frame away from the tension wheel is rotatably connected to the side surface of the tension adjustment plate, and the other end of the diamond-shaped frame is rotatably connected to the side surface of the adjustment slider.

[0015] Preferably, a tension adjustment wheel is symmetrically and rotatably mounted on the middle of the diamond frame, a contact roller is rotatably mounted on one end of the diamond frame connected to the adjustment slider, and a spring bidirectional movable contact rod is fixedly mounted on the side of the tension adjustment plate near the tension wheel. The two ends of the spring bidirectional movable contact rod are in contact with the side surfaces of the contact roller and the tension wheel, respectively.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] By improving the boom head assembly and hook assembly, the boom head assembly limits the movement of the cable from both sides individually through the cable swing balance frame and the cable limit frame. The cable swing balance frame and the cable limit frame are hinged. As the hook assembly swings, the cable twists, causing the cable swing balance frame and the cable limit frame to swing. The cable swing balance frame swings and deflects freely with the cable and, through the cooperation of the inclined wing plate and the spring telescopic sleeve, promptly drives the cable reset push plate above. This allows the cable reset push plate to push the cable with compensating support in the opposite direction of torsional offset, achieving timely dynamic balance of the cable twisting caused by swaying. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the crane of the present invention;

[0019] Figure 2 This is a schematic diagram of one side of the overall structure of the crane of the present invention;

[0020] Figure 3 This is a schematic diagram of the overall structure of the boom head assembly and hook assembly of the present invention;

[0021] Figure 4 This is a schematic diagram of the internal structure of the boom head assembly and hook assembly of the present invention from one side.

[0022] Figure 5 This is a schematic diagram of the internal structure of the boom head assembly and hook assembly of the present invention on the other side.

[0023] Figure 6 This is a schematic diagram of the overall internal structure of the boom head assembly and hook assembly of the present invention under cable twisting conditions;

[0024] Figure 7 This is a schematic diagram of the overall internal structure of the boom head assembly and hook assembly of the present invention;

[0025] Figure 8 This is a schematic diagram of the overall structure of the cable swing balance frame and spring telescopic sleeve of the present invention;

[0026] Figure 9 This is a top view schematic diagram of the overall structure of the cable swing balance frame and spring telescopic sleeve of the present invention;

[0027] Figure 10 For the present invention Figure 9 A magnified structural diagram at point A;

[0028] Figure 11 This is a schematic diagram of the other side of the overall structure of the cable swing balance frame and spring telescopic sleeve of the present invention;

[0029] Figure 12 This is a top view schematic diagram of the overall structure of the cable swing balance frame of the present invention;

[0030] Figure 13 This is a schematic diagram of the internal structure of the cable swing balance frame of the present invention;

[0031] Figure 14 This is a schematic diagram of the internal structure of the hook assembly of the present invention.

[0032] In the diagram: 1. Ship crane mounting frame; 2. Crane base; 3. Telescopic boom; 4. Lifting and unwinding equipment; 5. Cable; 6. Boom head assembly; 61. Fixed pulley; 62. Cable swing balance frame; 621. Swing limit frame; 622. Swing support frame; 623. Inclined wing plate one; 624. Return spring rod one; 625. Large positioning cam; 626. Positioning recess; 6261. Lubricating nozzle; 6262. Lubricating ball; 6263. Buffer plate; 63. Cable limit frame; 64. 1. Small cam; 632. Grooved wheel; 633. Anti-collision frame; 64. Cable reset push plate; 641. Inclined wing plate II; 642. Reset spring rod II; 65. Cable fixing roller; 66. Spring telescopic sleeve; 661. Double-headed inclined telescopic rod; 7. Hook assembly; 71. Hook; 72. Pulley; 73. Tensioning wheel; 74. Tension adjustment plate; 741. Diamond frame; 742. Tension adjustment wheel; 743. Adjusting slider; 7431. Contact roller; 744. Spring bidirectional movable actuating rod. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1

[0035] Please refer to Figures 1 to 14This invention provides a technical solution: a ship crane with a cable limiting mechanism, comprising a ship crane mounting frame 1, a crane base 2 fixedly mounted on the top of the ship crane mounting frame 1, a telescopic boom 3 movably mounted on the top of the crane base 2, a lifting and unwinding device 4 provided on one side of the telescopic boom 3, a cable 5 provided on the outer surface of the lifting and unwinding device 4, a boom head assembly 6 fixedly mounted on one end of the telescopic boom 3, and a hook assembly 7 provided below the boom head assembly 6. The ship crane mounting frame 1 mainly serves to fix the crane base 2 to the ship deck, and the crane base 2 mainly serves to install the telescopic boom 3, the lifting and unwinding device 4, and related electrical control accessories. The telescopic boom 3 is connected by a hydraulic telescopic rod. The telescopic lifting and unwinding device 4 primarily functions to wind and unwind cables 5. One end of the cable 5 is fixed and wound around the winding roller of the lifting and unwinding device 4, then passes over the guide wheel and arm head assembly 6 on the telescopic arm 3, and finally passes over the hook assembly 7. The other end of the cable 5 is fixed to the cable fixing roller 65 located inside the arm head assembly 6. Thus, when the lifting and unwinding device 4 winds up the cable 5, the hook assembly 7 is lifted; when the lifting and unwinding device 4 unwinds, the hook assembly 7 is lowered, enabling the lifting of objects. A fixed pulley 61 is located above the arm head assembly 6, and a cable swing balance frame 62 is located below the arm head assembly 6. A cable limit frame 63 is located on one side of the cable swing balance frame 62. The outer surface of cable 1 contacts the outer surface of cable 5. A swing support frame 622 is located below the side of the cable swing balance frame 62 near the cable limiting frame 63, and a swing limiting frame 621 is located below the other side of the cable swing balance frame 62. Both ends of the swing limiting frame 621 and the swing support frame 622 are fixedly connected to the inner surface of the arm head assembly 6. The lower surface of the cable swing balance frame 62 near the cable limiting frame 63 is rotatably connected to the middle of the swing support frame 622, and the lower surface of the other side of the cable swing balance frame 62 is slidably connected to the inner surface of the swing limiting frame 621. The swing limiting frame 621 and the swing support frame 622 mainly serve to support the cable swing balance frame 62. The swing limiting frame 621... It also serves to limit the swing of the cable swing balance frame 62; the outer surface of the cable swing balance frame 62 is symmetrically fixedly equipped with inclined wing plate 623, and a return spring rod 624 is provided on one side of the inclined wing plate 623. One end of the sleeve of the return spring rod 624 is fixedly connected to the side surface of the arm head assembly 6, and one end of the telescopic rod of the return spring rod 624 is in contact with the side surface of the inclined wing plate 623. The upper end of the cable limiting frame 63 is hinged to the side surface of the cable swing balance frame 62. The inside of the cable limiting frame 63 is rotatably equipped with a small cam 631 and a grooved wheel 632. The small cam 631 and the grooved wheel 632 are size-matched, and the outer surfaces of the small cam 631 and the grooved wheel 632 are in contact with the outer surface of the cable 5, respectively.

[0036] In this embodiment, the cable limiting frame 63 uses a small cam 631 and a grooved wheel 632 to wrap and limit the cable 5 on the side where it is fixed to the cable fixing roller 65. The small cam 631 and the grooved wheel 632 are made of smooth and wear-resistant materials such as rubber and bearing steel, which can prevent the cable from rubbing against each other. The small cam 631 and the grooved wheel 632 form a stable limiting channel through which the cable passes, making the cable move more stably along the predetermined trajectory. When the cable twists or deviates during the lifting process, the cable limiting frame 63 will adaptively deflect with the cable's deviation, preventing the rigid limiting from becoming more severe. When the cable wears down, the cable swing balance frame 62 also deflects. When the cable swing balance frame 62 deflects to adapt to the cable's twist, its outer inclined wing plate 623 will squeeze the return spring rod 624 to provide elastic buffering for the cable's twist, mitigate the impact between the arm head assembly 6 and the cable, and provide dynamic limit protection for the cable. In addition, a collision protection frame 633 is fixedly installed on the bottom outer side of the cable limit frame 63. It mainly serves to limit the hook assembly 7 when it is lifted and approaches the bottom of the arm head assembly 6, so as to prevent the hook assembly 7 from colliding with the arm head assembly 6.

[0037] Example 2

[0038] Please refer to Figures 1 to 14 Based on Embodiment 1, in order to adapt to the torsional deviation of the cable and perform dynamic balance limiting, this embodiment further proposes that a cable reset push plate 64 be provided above the cable swing balance frame 62, and inclined wing plates 641 be symmetrically fixedly installed on the outer surface of the cable reset push plate 64. A reset spring rod 642 is provided on one side of the inclined wing plate 641, and one end of the sleeve of the reset spring rod 642 is fixedly connected to the side surface of the arm head assembly 6. One end of the telescopic rod of the reset spring rod 642 is connected to the inclined wing plate 641. The side surface of 1 is fixedly connected, and the inner surface of the arm head assembly 6 is symmetrically fixedly installed with a spring telescopic sleeve 66. A double-headed inclined telescopic rod 661 is slidably installed inside the spring telescopic sleeve 66. A spring is fixedly installed inside the spring telescopic sleeve 66. One end of the spring is fixedly connected to the pad surface of the double-headed inclined telescopic rod 661. The upper inclined surface of the double-headed inclined telescopic rod 661 contacts the lower surface of the inclined wing plate 2 641, and the lower inclined surface of the double-headed inclined telescopic rod 661 contacts the upper surface of the inclined wing plate 1 623.

[0039] In this embodiment, the spring telescopic sleeve 66 is disposed on the outside of the inclined wing plate 623. It should be noted that, in the initial state, the spring inside the spring telescopic sleeve 66 keeps the lower end of the double-headed inclined telescopic rod 661 in an extended state. When the cable swing balance frame 62 adaptively deflects to reduce impact as the cable twists and shifts, the inclined wing plate 623 will squeeze the double-headed inclined telescopic rod 661, causing the lower inclined surface of the double-headed inclined telescopic rod 661 to gradually rise along the inclined surface of the inclined wing plate 623. At this time, the upper inclined surface of the double-headed inclined telescopic rod 661 will push the inclined surface of the second inclined wing plate 641, causing the second inclined wing plate 641 to move in the opposite direction to the deflection of the cable swing balance frame 62. The surface of the cable reset push plate 64 that contacts the cable adopts an inwardly concave arc design, which can adapt to the cable twist to the greatest extent and provide compensation support for the cable in the opposite direction of twisting and shifting. It can dynamically balance the twisting and shifting of the cable caused by shaking in a timely manner, so that the cable can recover stability more quickly. The structural design is simple and can be adapted to the cable itself. The system responds promptly to torsional changes, improving the stability of cable movement. Once the cable stabilizes, the inclined wing plate 623, with the cooperation of the return spring rod 624, the inclined wing plate 641, with the cooperation of the return spring rod 642, and the double-headed inclined telescopic rod 661, with the cooperation of the elasticity inside the spring telescopic sleeve 66, simultaneously reset without the need for additional components. Furthermore, during the entire deflection and compression process, the return spring rod 624 and the return spring rod 642 both have a certain buffering effect, reducing the rigid impact between the cable and the arm head assembly 6. It should be noted that when the return spring rod 624 is in its initial state, the spring inside the return spring rod 624 pushes the telescopic rod of the return spring rod 624 into the extended state. The return spring rod 624 is designed with three sets, with the lengths changing sequentially to adapt to the deflection and compression of the inclined wing plate 623. When the return spring rod 642 is in its initial state, the spring inside it restricts the telescopic rod of the return spring rod 642 to the sides, keeping it in the retracted state.

[0040] Example 3

[0041] Please refer to Figures 1 to 14Based on Embodiment 2, to further reduce the friction between the cable and the cable swing balance frame 62, this embodiment further proposes that a large positioning cam 625 is rotatably mounted in the middle of the inner surface of the cable swing balance frame 62, a positioning recess 626 is fixedly mounted on one side of the inner surface of the cable swing balance frame 62, lubrication nozzles 6261 are symmetrically fixedly mounted on both sides of the inner surface of the positioning recess 626, lubrication balls 6262 are movably mounted inside the lubrication nozzles 6261, and a buffer plate 6263 is fixedly mounted in the middle of the inner surface of the positioning recess 626. The side surfaces of the buffer plate 6263 and the large positioning cam 625 are in contact with the outer surface of the cable 5, respectively. In this embodiment, the large positioning cam 625 will... The cable 5 is confined within the groove of the positioning recess 626, and the large positioning cam 625 can roll. The surface of the buffer plate 6263 that contacts the cable 5 is provided with balls to reduce wear on the cable. Buffer springs are evenly distributed between the buffer plate 6263 and the positioning recess 626 to accommodate small-amplitude cable movement. When the cable twists or deviates, it will contact the lubricating oil nozzle 6261 on the side of the positioning recess 626. As the cable moves, the friction lubricating balls 6262 roll, allowing the lubricating oil stored inside the positioning recess 626 to be evenly applied to the cable surface, reducing friction between the cable and the fixed pulley 61. An oil inlet pipe is provided at the upper end of the positioning recess 626 for regular lubrication.

[0042] Example 4

[0043] Please refer to Figures 1 to 14 Based on Embodiment 3, to make the movement of cable 5 more stable during lifting, this embodiment further proposes that a pulley 72 be rotatably installed below the inner surface of the hook assembly 7, a tension adjustment plate 74 be provided above the pulley 72, a hook 71 be fixedly installed at the bottom of the hook assembly 7, the outer surface of the pulley 72 be in contact with the outer surface of the cable 5, a tension wheel 73 be movably installed inside the hook assembly 7 near the cable limiting frame 63, the outer surface of the tension wheel 73 be in contact with the outer surface of the cable 5, one side surface of the tension adjustment plate 74 be fixedly installed on the inner surface of the hook assembly 7, and a diamond-shaped frame 741 be provided on the other side surface of the tension adjustment plate 74. An adjusting slider 743 is slidably mounted on the inner surface of the tension adjusting plate 74. One end of the rhombus frame 741 away from the tension wheel 73 is rotatably connected to the side surface of the tension adjusting plate 74. The other end of the rhombus frame 741 is rotatably connected to the side surface of the adjusting slider 743. A tension adjusting wheel 742 is symmetrically rotatably mounted on the middle of the rhombus frame 741. A contact roller 7431 is rotatably mounted on the end of the rhombus frame 741 connected to the adjusting slider 743. A spring bidirectional movable contact rod 744 is fixedly mounted on the side of the tension adjusting plate 74 near the tension wheel 73. The two ends of the spring bidirectional movable contact rod 744 are in contact with the contact roller 7431 and the side surface of the tension wheel 73, respectively.

[0044] In this embodiment, one end of the cable 5 is wound up and unwound by the lifting and winding device 4. The cable 5 passes sequentially around the guide wheel, fixed pulley 61, and pulley 72 on the telescopic arm 3, and is then tensioned by the tensioning wheel 73 before entering the cable limiting frame 63. Finally, the other end of the cable 5 is fixed to the cable fixing roller 65. As the lifting and winding device 4 winds up and unwinds, the cable 5 slides, realizing the up and down movement of the hook assembly 7. The hook 71 is mainly used to fix the object to be lifted, such as a fishing net. During this process, the tensioning wheel 73 mainly tensions the side of the cable closest to the cable limiting frame 63, making the cable more stable. The cable moves stably. The tension adjustment plate 74 mainly serves to mount the diamond frame 741 and the adjusting slider 743. The tension wheel 73 compresses the internal telescopic rod of the bidirectional movable contact spring 744, causing the contact roller 7431 to drive the adjusting slider 743 to slide within the tension adjustment plate 74. This causes the diamond frame 741 to deform, indirectly adjusting the position of the tension adjustment wheel 742 and thus adjusting the tension on the other side of the cable. It should be noted that the tension adjustment plate 74 is internally designed with a sliding rod to limit the movement of the adjusting slider 743. The contact roller 7431 is rotatably mounted on the adjusting plate 74. On one side of the slider 743, the tensioning wheel 73 is installed in the same way as the contact roller 7431. The tensioning wheel 73 is mounted on the side wall of the hook assembly 7 via the slider. The tensioning wheel 73 and the tension adjusting wheel 742 are hourglass-shaped, which can provide a certain degree of limit position correction for the cable. A spring is provided in the middle of the spring-loaded bidirectional movable actuating rod 744, providing elastic support to both sides. This ensures that in the initial state, pushing the tensioning wheel 73 and the tension adjusting wheel 742 applies a certain tension force to both sides of the cable. Taking excessive tension on one side of the tensioning wheel 73 as an example, the following explanation is provided. The specific tension adaptive adjustment process is as follows: When the tension on one side of the tension wheel 73 is too high, the tension wheel 73 moves inward to compress the bidirectional movable contact rod 744 of the spring, causing the contact rod to push the contact roller 7431 to drive the adjusting slider 743 to slide to the other side of the cable position. At this time, the diamond frame 741 deforms, causing the tension adjusting wheel 742 to increase the tension on the other side of the cable, and relax the excessive tension of the tension wheel 73. The entire tension adjustment process is a dynamic adjustment process, which is adjusted multiple times according to the cable tension to ensure that the cable tension on both sides of the pulley 72 always maintains dynamic balance, making the cable movement smoother and more stable.

[0045] Example 5

[0046] Please refer to Figures 1 to 14 Based on Embodiment 4, this embodiment also proposes a method for using a ship crane with a cable limiting mechanism, including the following steps:

[0047] Step 1: The lifting and unwinding equipment 4 unwinds the cable 5 to lower the hook assembly 7, and fixes the object to be lifted to the hook 71 below the hook assembly 7. The lifting and unwinding equipment 4 slowly winds up the cable 5 to move the hook assembly 7 and lift it.

[0048] Step 2: When the cable twists and deviates during the lifting process, the cable limiting frame 63 will adaptively deflect with the cable's deviation, and drive the cable swing balance frame 62 to adapt to the cable's twist and deflect. The outer inclined wing plate 623 will squeeze the reset spring rod 624 and the double-headed inclined telescopic rod 661 to provide elastic buffering for the cable's twist. After being squeezed by the inclined wing plate 623, the lower inclined surface of the double-headed inclined telescopic rod 661 will gradually rise along the inclined surface of the inclined wing plate 623. The upper inclined surface of the double-headed inclined telescopic rod 661 will push the inclined surface of the second inclined wing plate 641 to move the second inclined wing plate 641 in the opposite direction to the deflection of the cable swing balance frame 62, providing compensation support for the cable in the opposite direction of twist and deviate, and dynamically balancing the twist and deviate of the cable caused by the swaying, so that the cable can recover stability more quickly.

[0049] Step 3: When the cable twists and deflects, causing the cable swing balance frame 62 to make adaptive deflection, the cable will come into contact with the lubricating oil nozzle 6261 on the side of the positioning recess 626. As the cable moves, the friction lubrication ball 6262 rolls, which can evenly apply the lubricating oil stored inside the positioning recess 626 to the surface of the cable, reducing the friction between the cable and the fixed pulley 61.

[0050] Step four: Finally, after the hook assembly 7 successfully lifts the object, the crane base 2 and telescopic arm 3 work together to transport the object to a suitable position. Then, the lifting and unwinding equipment 4 slowly unwinds the cable 5, causing the hook assembly 7 to move down and lower the object. After the object is removed from the hook 71, the lifting and transportation of the object is completed.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A ship crane with a cable limiting mechanism, comprising a ship crane mounting frame (1), a crane base (2) fixedly mounted above the ship crane mounting frame (1), a telescopic boom (3) movably mounted above the crane base (2), a lifting and unwinding device (4) provided on one side of the telescopic boom (3), and a cable (5) provided on the outer surface of the lifting and unwinding device (4), characterized in that: One end of the telescopic boom (3) is fixedly installed with a boom head assembly (6). A hook assembly (7) is provided below the boom head assembly (6). A fixed pulley (61) is provided above the boom head assembly (6). A cable swing balance frame (62) is provided below the boom head assembly (6). A cable limit frame (63) is provided on one side of the cable swing balance frame (62). A cable reset push plate (64) is provided above the cable swing balance frame (62). Spring telescopic sleeves (66) are symmetrically fixedly installed on the inner surface of the boom head assembly (6). A pulley (72) is rotatably installed below the inner surface of the hook assembly (7). A tension adjustment plate (74) is provided above the pulley (72). The outer surface of the fixed pulley (61) is in contact with the outer surface of the cable (5). A swing support frame (622) is provided below the side of the cable swing balance frame (62) near the cable limit frame (63). A swing limit frame (621) is provided on the lower side of the other side of the cable swing balance frame (62). Both ends of the swing limit frame (621) and the swing support frame (622) are fixedly connected to the inner surface of the arm head assembly (6). The lower surface of the cable swing balance frame (62) near the cable limit frame (63) is rotatably connected to the middle of the swing support frame (622). The lower surface of the other side of the cable swing balance frame (62) is slidably connected to the inner surface of the swing limit frame (621). A first inclined wing plate (623) is symmetrically fixedly installed on the outer surface of the cable swing balance frame (62). A first return spring rod (624) is provided on one side of the first inclined wing plate (623). One end of the sleeve of the first return spring rod (624) is fixedly connected to the side surface of the arm head assembly (6). One end of the telescopic rod of the first return spring rod (624) is in contact with the side surface of the first inclined wing plate (623).

2. A ship crane with a cable limiting mechanism according to claim 1, characterized in that: The upper end of the cable limiting frame (63) is hinged to the side surface of the cable swing balance frame (62). The cable limiting frame (63) is rotatably mounted with a small cam (631) and a grooved wheel (632). The small cam (631) and the grooved wheel (632) are size-matched. The outer surfaces of the small cam (631) and the grooved wheel (632) are in contact with the outer surface of the cable (5).

3. A ship crane with a cable limiting mechanism according to claim 1, characterized in that: The outer surface of the cable reset push plate (64) is symmetrically fixedly equipped with inclined wing plate two (641). A reset spring rod two (642) is provided on one side of the inclined wing plate two (641). One end of the sleeve of the reset spring rod two (642) is fixedly connected to the side surface of the arm head assembly (6). One end of the telescopic rod of the reset spring rod two (642) is fixedly connected to the side surface of the inclined wing plate two (641).

4. A ship crane with a cable limiting mechanism according to claim 3, characterized in that: A double-headed inclined telescopic rod (661) is slidably installed inside the spring telescopic sleeve (66). A spring is fixedly installed inside the spring telescopic sleeve (66). One end of the spring is fixedly connected to the pad surface of the double-headed inclined telescopic rod (661). The upper inclined surface of the double-headed inclined telescopic rod (661) is in contact with the lower surface of the second inclined wing plate (641). The lower inclined surface of the double-headed inclined telescopic rod (661) is in contact with the upper surface of the first inclined wing plate (623).

5. A ship crane with a cable limiting mechanism according to claim 1, characterized in that: A large positioning cam (625) is rotatably mounted on the middle of the inner surface of the cable swing balance frame (62). A positioning recess (626) is fixedly mounted on one side of the inner surface of the cable swing balance frame (62). Lubricating nozzles (6261) are symmetrically fixedly mounted on both sides of the inner surface of the positioning recess (626). Lubricating balls (6262) are movably mounted inside the lubricating nozzles (6261). A buffer plate (6263) is fixedly mounted on the middle of the inner surface of the positioning recess (626). The side surfaces of the buffer plate (6263) and the large positioning cam (625) are in contact with the outer surface of the cable (5).

6. A ship crane with a cable limiting mechanism according to claim 1, characterized in that: The bottom of the hook assembly (7) is fixedly equipped with a hook (71), the outer surface of the pulley (72) is in contact with the outer surface of the cable (5), and a tension wheel (73) is movably installed inside the hook assembly (7) on the side near the cable limiting frame (63), and the outer surface of the tension wheel (73) is in contact with the outer surface of the cable (5).

7. A ship crane with a cable limiting mechanism according to claim 1, characterized in that: One side surface of the tension adjustment plate (74) is fixedly installed on the inner surface of the hook assembly (7). A rhombus frame (741) is provided on the other side surface of the tension adjustment plate (74). An adjustment slider (743) is slidably installed on the inner surface of the tension adjustment plate (74). One end of the rhombus frame (741) away from the tension wheel (73) is rotatably connected to the side surface of the tension adjustment plate (74). The other end of the rhombus frame (741) is rotatably connected to the side surface of the adjustment slider (743).

8. A ship crane with a cable limiting mechanism according to claim 7, characterized in that: The middle part of the rhomboid frame (741) is symmetrically mounted with tension adjustment wheels (742). The end of the rhomboid frame (741) connected to the adjustment slider (743) is rotatably mounted with a contact roller (7431). The tension adjustment plate (74) is fixedly mounted with a spring bidirectional movable touch rod (744) on the side near the tension wheel (73). The two ends of the spring bidirectional movable touch rod (744) are in contact with the side surfaces of the contact roller (7431) and the tension wheel (73), respectively.

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