Ship crane with cable limiting mechanism

Abstract

The invention relates to the technical field of cranes, in particular to a ship crane with a cable limiting mechanism, which comprises a ship crane mounting rack, a crane base is fixedly mounted above the ship crane mounting rack, and a telescopic arm is movably mounted above the crane base. The lifting device has the beneficial effects that the arm head assembly and the lifting hook assembly are improved, the arm head assembly independently limits movement of a cable from the two sides through the cable swing balance frame and the cable limiting frame, the cable swing balance frame is hinged to the cable limiting frame, and the cable swing balance frame can swing along with the lifting hook assembly; the cable can twist to drive the cable swing balance frame and the cable limiting frame to swing, the cable swing balance frame freely swings and deflects along with the cable, and the cable reset push plate above is driven in time through cooperation of the first bevel wing plate and the spring telescopic sleeve, so that the cable reset push plate pushes the cable to have compensation support in the anti-twisting deviation direction. The effect of timely and dynamically balancing torsion of the cable caused by shaking is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of cranes, and in particular relates to a ship crane with a cable limiting mechanism. Background Art

[0002] As a key equipment for ship operations at sea, ship cranes undertake important tasks such as cargo lifting and transfer. The cable limiting structure, as an important component of the crane, has the main function of ensuring that the cable moves within the specified range, preventing the cable from excessive stretching, wear or entanglement, thereby ensuring the safe and stable operation of the crane. In the existing technology, cable limiting usually adopts physical limiting methods, such as setting limiting guides, blocks, etc. to control the movement range of the cable and reduce the risk of cargo shaking; however, these limiting structures rely too much on the rigid limitation of the cable itself, but seriously ignore the impact of the shaking of the cargo during the lifting process. Once the cargo shakes, it will drive the cable to have a torsional force. The traditional rigid limiting structure will produce severe friction with the cable when the cable is torsionally offset, which is not only not conducive to cable movement but also causes cable wear and affects the service life of the cable.

[0003] The existing Chinese patent document with announcement number CN119750377B proposes a ship crane guide rail structure. By designing auxiliary components, if the heavy object is on the front side of the slide rail assembly, the first motor can be driven to drive the screw through the counterclockwise rotation of the bevel gear set, so that the movable plate moves backward in the track groove. At this time, the two sets of third springs on the front side will be stretched, and the two sets of third springs on the back side will shrink. In this way, the first guide rail on the front side will be subjected to a stronger pulling force. The above technical problems are solved by mechanically adjusting the pulling force. However, the response of the motor, screw rod, and spring system in the above method has problems 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 "confrontation" between the pulling force direction and the shaking direction, which in turn aggravates the cable impact.

[0004] Therefore, the present invention proposes a ship crane with a cable limiting mechanism to solve the problem that the mechanical adjustment of the pulling force in the existing technology will cause mechanical inertia and control delay, and there is no time to adjust, resulting in a brief "confrontation" between the pulling force direction and the shaking direction, which aggravates the cable rush. The cable swing balance frame is designed to not only limit the longitudinal movement of the cable but also make timely free dynamic adjustments as the cable swings. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention aims to provide a ship crane with a cable limiting mechanism to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a ship crane with a cable limiting mechanism, comprising a ship crane mounting frame, a crane base is fixedly installed above the ship crane mounting frame, a telescopic arm is movably installed above the crane base, a lifting and unwinding device is provided on one side of the telescopic arm, a cable is provided on the outer surface of the lifting and unwinding device, an arm head assembly is fixedly installed at one end of the telescopic arm, a hook assembly is provided below the arm head assembly, a fixed pulley is provided above the arm head assembly, a cable swing balance frame is provided below the arm head assembly, a cable limiting frame is provided on one side of the cable swing balance frame, a cable reset push plate is provided above the cable swing balance frame, a spring telescopic sleeve is symmetrically fixedly installed on the inner surface of the arm head assembly, a pulley is rotatably installed below the inner surface of the hook assembly, and a tensioning adjustment plate is provided above the pulley.

[0007] Preferably, the outer surface of the fixed pulley contacts the outer surface of the cable, a swing support frame is provided below one side of the cable swing balance frame close to the cable limit frame, and a swing limit frame is provided below the other side of the cable swing balance frame, both ends of the swing limit 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 close to the cable limit frame is rotatably connected to the middle inner part 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 limit frame.

[0008] Preferably, a sloped wing plate 1 is symmetrically fixedly installed on the outer surface of the cable swing balance frame, and a return spring rod 1 is provided on one side of the sloped wing plate 1. One end of the sleeve of the return spring rod 1 is fixedly connected to the side surface of the arm head assembly, and one end of the telescopic rod of the return spring rod 1 is in contact with one side surface of the sloped wing plate.

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

[0010] Preferably, the outer surface of the cable reset push plate is symmetrically fixed with inclined wing plates 2, and one side of the inclined wing plate 2 is provided with a reset spring rod 2, one end of the sleeve of the reset spring rod 2 is fixedly connected to the side surface of the arm head assembly, and one end of the telescopic rod of the reset spring rod 2 is fixedly connected to the side surface of the inclined wing plate 2.

[0011] Preferably, a double-headed inclined telescopic rod is slidably installed inside the spring telescopic sleeve, a spring is fixedly installed inside the spring telescopic sleeve, one end of the spring is fixedly connected to the gasket surface of the double-headed inclined telescopic rod, the upper end inclined surface of the double-headed inclined telescopic rod is in contact with the lower surface of the inclined wing plate 2, and the lower end inclined surface of the double-headed inclined telescopic rod is in contact with the upper surface of the inclined wing plate 1.

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

[0013] Preferably, a hook is fixedly installed at the bottom of the hook assembly, the outer surface of the pulley contacts the outer surface of the cable, and a tensioning wheel is movably installed on one side of the hook assembly close to the cable limit frame, and the outer surface of the tensioning wheel contacts the outer surface of the cable.

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

[0015] Preferably, a tensioning adjustment wheel is symmetrically installed in the upper and lower parts of the middle part of the rhombus frame, a contact roller is rotatably installed on one end of the rhombus frame connected to the adjustment slider, and a spring bidirectional movable trigger rod is fixedly installed on the side of the tensioning adjustment plate close to the tensioning wheel, and the two ends of the trigger rod of the spring bidirectional movable trigger rod are in contact with the contact roller and the side surface of the tensioning wheel respectively.

[0016] Compared with the prior art, the present invention has the following beneficial effects: By improving the arm head assembly and the hook assembly, the arm head assembly limits the movement of the cable from both sides separately through the cable swing balance frame and the cable limit frame, and the cable swing balance frame is hinged to the cable limit frame. As the hook assembly swings, the cable will twist and drive the cable swing balance frame and the cable limit frame to swing. The cable swing balance frame deflects as the cable swings freely and cooperates with the inclined wing plate and the spring telescopic sleeve to timely drive the cable reset push plate above, so that the cable reset push plate pushes the cable with compensatory support in the direction of the anti-torsion offset, thereby achieving the effect of timely dynamic balance of the cable twisting due to shaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the crane of the present invention; Figure 2 This is a schematic diagram of the overall structure of one side of the crane of the present invention; Figure 3 This is a schematic diagram of the overall structure of the arm head assembly and the hook assembly of the present invention; Figure 4 This is a schematic diagram of the internal structure of the arm head assembly and the hook assembly of the present invention; Figure 5 This is a schematic diagram of the other side of the overall internal structure of the arm head assembly and hook assembly of the present invention; Figure 6 This is a schematic diagram of the overall internal structure of the arm head assembly and the hook assembly of the present invention in a cable twisted state; Figure 7 This is a schematic diagram of the overall internal structure of the arm head assembly and the hook assembly of the present invention; Figure 8 This is a schematic diagram of the overall structure of the cable swing balance frame and the spring telescopic sleeve of the present invention; Figure 9 This is a schematic diagram of the overall top view of the cable swing balance frame and the spring telescopic sleeve of the present invention; Figure 10 For the present invention Figure 9 A schematic diagram of the enlarged structure at point A; Figure 11 This is a schematic diagram of the other side structure of the cable swing balance frame and the spring telescopic sleeve of the present invention; Figure 12 This is a schematic diagram of the overall top view of the cable swing balance frame of the present invention; Figure 13 A schematic diagram of the internal structure of the cable swing balance frame of the present invention; Figure 14 It is a schematic diagram of the internal structure of the hook assembly of the present invention.

[0018] Figure: 1. Ship crane mounting frame; 2. Crane base; 3. Telescopic boom; 4. Lifting and reeling 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 1; 624. Return spring rod 1; 625. Large positioning cam; 626. Positioning recessed box; 6261. Lubricating nozzle; 6262. Lubricating ball; 6263. Buffer plate; 63. Cable limit frame; 63 1. Small cam; 632. Grooved wheel; 633. Anti-collision frame; 64. Cable reset push plate; 641. Inclined wing plate 2; 642. Reset spring rod 2; 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. Tensioning adjustment plate; 741. Diamond frame; 742. Tensioning adjustment wheel; 743. Adjustment slider; 7431. Contact roller; 744. Spring bidirectional movable trigger rod. DETAILED DESCRIPTION

[0019] In order to clearly and completely describe the objectives and technical solutions of the present invention and make its advantages more clearly understood, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, not to limit 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.

[0020] Example 1 Please refer to Figures 1 to 14The present invention provides a technical solution: a ship crane with a cable limiting mechanism, comprising a ship crane mounting frame 1, a crane base 2 is fixedly installed above the ship crane mounting frame 1, a telescopic arm 3 is movably installed above the crane base 2, a lifting and unwinding device 4 is provided on one side of the telescopic arm 3, a cable 5 is provided on the outer surface of the lifting and unwinding device 4, an arm head assembly 6 is fixedly installed at one end of the telescopic arm 3, and a hook assembly 7 is provided below the arm head assembly 6. The ship crane mounting frame 1 mainly serves to fix the crane base 2 on the ship deck, and the crane base 2 mainly serves to install the telescopic arm 3, the lifting and unwinding device 4 and related electrical control accessories. The telescopic arm 3 cooperates with the hydraulic telescopic rod to The lifting and unwinding device 4 is telescopic and mainly plays the role of winding and unwinding the cable 5. One end of the cable 5 is fixed and wound on the winding roller of the lifting and unwinding device 4, and then passes around the guide wheel and the arm head assembly 6 set on the telescopic arm 3, and finally passes around the hook assembly 7. The other end of the cable 5 is fixed on the cable fixing roller 65 set on one side of the arm head assembly 6. In this way, when the lifting and unwinding device 4 rewinds the cable 5, the hook assembly 7 is lifted, and when the lifting and unwinding device 4 unwinds, the hook assembly 7 is lowered, so that the lifting of the object can be realized; a fixed pulley 61 is provided above the arm head assembly 6, and a cable swing balance frame 62 is provided below the arm head assembly 6. A cable limit frame 63 is provided on one side of the cable swing balance frame 62. The outer surface of 1 contacts the outer surface of the cable 5, a swing support frame 622 is provided below the side of the cable swing balance frame 62 close to the cable limit frame 63, and a swing limit frame 621 is provided below 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 close to the cable limit frame 63 is rotatably connected to the middle inner part of the swing support frame 62. 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. The swing limit frame 621 and the swing support frame 622 mainly play the role of supporting the cable swing balance frame 62, wherein the swing limit frame 621 It also serves to limit the swing of the cable swing balance frame 62; an inclined wing plate 623 is symmetrically fixedly installed on the outer surface of the cable swing balance frame 62, 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 contacts the side surface of the inclined wing plate 623. The upper end of the cable limit frame 63 is hinged to the side surface of the cable swing balance frame 62, and a small cam 631 and a groove wheel 632 are rotatably installed inside the cable limit frame 63. The small cam 631 and the groove wheel 632 are adapted in size, and the outer surfaces of the small cam 631 and the groove wheel 632 are respectively in contact with the outer surface of the cable 5; In this embodiment, the cable limit frame 63 wraps and limits the side of the cable 5 fixed to the cable fixing roller 65 through the interlocking small cam 631 and groove wheel 632. The small cam 631 and groove wheel 632 are made of smooth and wear-resistant materials such as rubber and bearing steel, which can avoid severe friction of the cable. The small cam 631 and groove wheel 632 form a stable limiting channel for the cable to pass through, making the cable move more stably along the established trajectory. When the cable is twisted and deflected during the lifting process, the cable limit frame 63 as a whole will adaptively deflect with the deviation of the cable to avoid aggravation of the rigid limit. The cable wears and causes the cable swing balance frame 62 to deflect as a whole. When the cable swing balance frame 62 deflects to adapt to the torsion of the cable, the inclined wing plate 623 on its outside will squeeze the reset spring rod 624, elastically buffering the torsion of the cable, alleviating the impact between the arm head assembly 6 and the cable, and dynamically limiting the cable. In addition, an anti-collision frame 633 is fixedly installed on the outside of the bottom of the cable limit frame 63, which 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 avoid collision between the hook assembly 7 and the arm head assembly 6.

[0021] Example 2 Please refer to Figures 1 to 14 On the basis of the first embodiment, in order to adapt to the torsional deviation of the cable and perform dynamic balancing and limiting, the present embodiment further proposes that a cable reset push plate 64 is provided above the cable swing balance frame 62, and the outer surface of the cable reset push plate 64 is symmetrically fixedly mounted with a second inclined wing plate 641, and one side of the second inclined wing plate 641 is provided with a second reset spring rod 642, and one end of the sleeve of the second reset spring rod 642 is fixedly connected to the side surface of the arm head assembly 6, and one end of the telescopic rod of the second reset spring rod 642 is fixedly connected to the side surface of the arm head assembly 6 1 is fixedly connected to the side surface of the arm head assembly 6, and a spring telescopic sleeve 66 is symmetrically fixedly installed on the inner surface of the arm head assembly 6. 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 gasket surface of the double-headed inclined telescopic rod 661. The upper end inclined surface of the double-headed inclined telescopic rod 661 contacts the lower surface of the inclined wing plate 2 641, and the lower end inclined surface of the double-headed inclined telescopic rod 661 contacts the upper surface of the inclined wing plate 1 623; The spring expansion sleeve 66 is arranged on the outer side of the inclined wing plate 1 623. It should be noted that in the initial state, the spring inside the spring expansion sleeve 66 makes the lower end of the double-headed inclined expansion rod 661 in an extended state. When the cable swing balance frame 62 adaptively deflects with the torsional deviation of the cable to reduce the impact, the inclined wing plate 1 623 will squeeze the double-headed inclined expansion rod 661, so that the lower end inclined surface of the double-headed inclined expansion rod 661 gradually rises along the inclined surface of the inclined wing plate 1 623. At this time, the upper end inclined surface of the double-headed inclined expansion rod 661 will push the inclined surface of the inclined wing plate 2 641 to move the inclined wing plate 2 641 in the opposite direction of the deflection of the cable swing balance frame 62. The surface of the cable reset push plate 64 in contact with the cable adopts an inward concave arc design, which can adapt to the torsion of the cable to the greatest extent and provide compensatory support for the cable in the direction of the anti-torsion deviation, so as to dynamically balance the torsional deviation of the cable caused by shaking in time, so that the cable can recover stability faster. The structural design is simple and can be used according to the cable's own The torsional changes are responded to in time to improve the stability of the cable movement. When the cable returns to stability, the inclined wing plate 1 623 is reset synchronously with the cooperation of the return spring rod 1 624, the inclined wing plate 2 641 is reset with the cooperation of the return spring rod 2 642, and the double-headed inclined telescopic rod 661 is reset in the elastic cooperation inside the spring telescopic sleeve 66. No additional parts are required for cooperation. In the entire deflection and extrusion process, the return spring rod 1 624 and the return spring rod 2 642 have a certain buffering effect to reduce the rigid impact between the cable and the arm head assembly 6. It should be noted that when the return spring rod 1 624 is in the initial state, the spring inside the return spring rod 1 624 pushes the telescopic rod of the return spring rod 1 624 to be in an extended state, and the return spring rod 1 624 is designed with three groups, and the lengths change in sequence to adapt to the deflection and extrusion of the inclined wing plate 1 623. When the return spring rod 2 642 is in the initial state, the spring inside it limits the telescopic rod of the return spring rod 2 642 to be in a retracted state on both sides.

[0022] Example 3 Please refer to Figures 1 to 14On the basis of the second embodiment, in order 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 installed in the middle of the inner surface of the cable swing balance frame 62, a positioning recessed box 626 is fixedly installed on one side of the inner surface of the cable swing balance frame 62, and lubricating oil nozzles 6261 are symmetrically fixedly installed on both sides of the inner surface of the positioning recessed box 626, and lubricating balls 6262 are movably installed inside the lubricating oil nozzle 6261, and a buffer plate 6263 is fixedly installed in the middle of the inner surface of the positioning recessed box 626, and 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 restricted to the inner side of the groove of the positioning recessed box 626, and the large positioning cam 625 can roll. The surface of the buffer plate 6263 in contact with the cable 5 is provided with a ball to reduce the wear on the cable. Buffer springs are evenly distributed between the buffer plate 6263 and the positioning recessed box 626, which can adapt to the movement of the cable in a small range. When the cable is twisted and offset, the cable will contact the lubricating oil nozzle 6261 on the side of the positioning recessed box 626. As the cable moves, the friction lubricating ball 6262 is rubbed to make it roll, and the lubricating oil stored in the positioning recessed box 626 can be evenly applied to the surface of the cable, reducing the friction between the cable and the fixed pulley 61. The upper end of the positioning recessed box 626 is provided with an oil inlet pipe to facilitate regular replenishment of the lubricating oil.

[0023] Example 4 Please refer to Figures 1 to 14 On the basis of the third embodiment, in order to make the cable 5 move more stably during the lifting process, this embodiment further proposes that a pulley 72 is rotatably installed at the lower inner surface of the hook assembly 7, and a tensioning adjustment plate 74 is provided above the pulley 72. A hook 71 is fixedly installed at the bottom of the hook assembly 7, and the outer surface of the pulley 72 contacts the outer surface of the cable 5. A tensioning wheel 73 is movably installed on one side of the hook assembly 7 near the cable limit frame 63, and the outer surface of the tensioning wheel 73 contacts the outer surface of the cable 5. One side surface of the tensioning adjustment plate 74 is fixedly installed on the inner surface of the hook assembly 7, and the other side surface of the tensioning adjustment plate 74 is provided with a diamond frame 741. An adjustment slider 743 is slidably mounted on the inner surface of the tension adjustment plate 74. One end of the diamond frame 741 away from the tensioning wheel 73 is rotatably connected to the side surface of the tension adjustment plate 74. The other end of the diamond frame 741 is rotatably connected to the side surface of the adjustment slider 743. A tension adjustment wheel 742 is rotatably mounted on the middle part of the diamond frame 741. A contact roller 7431 is rotatably mounted on the end of the diamond frame 741 connected to the adjustment slider 743. A spring-loaded bidirectional movable trigger rod 744 is fixedly mounted on the side of the tension adjustment plate 74 close to the tensioning wheel 73. The two ends of the trigger rod of the spring-loaded bidirectional movable trigger rod 744 are respectively in contact with the contact roller 7431 and the side surface of the tensioning wheel 73; In this embodiment, one end of the cable 5 is wound and unwound through the lifting and rewinding device 4, and the cable 5 passes through the guide wheel, fixed pulley 61, and pulley 72 on the telescopic arm 3 in turn, is tensioned by the tensioning wheel 73, and enters the cable limit frame 63. Finally, the other end of the cable 5 is fixed on the cable fixing roller 65. As the lifting and rewinding device 4 is wound and unwound, the cable 5 slides, realizing the up and down movement of the hook assembly 7. The hook 71 is mainly used to fix objects that need to be lifted, such as fishing nets. In this process, the tensioning wheel 73 mainly plays the role of tensioning the cable close to the cable limit frame 63, so that The cable moves stably, and the tension adjustment plate 74 mainly serves to install the diamond frame 741 and the adjustment slider 743, and the tension wheel 73 squeezes the contact spring bidirectional movable trigger rod 744 to make the contact roller 7431 drive the adjustment slider 743 to slide inside the tension adjustment plate 74, causing the diamond frame 741 to deform, thereby indirectly adjusting the position of the tension adjustment wheel 742 and adjusting the tension degree of the other side of the cable. It should be noted that the tension adjustment plate 74 is internally designed with a sliding rod for limiting the adjustment slider 743, and the contact roller 7431 is rotated and installed on the adjustment On one side of the entire slider 743, the installation of the tensioning wheel 73 is the same as that of the contact roller 7431. The tensioning wheel 73 is installed on the side wall of the hook assembly 7 through the slider, and the tensioning wheel 73 and the tensioning adjustment wheel 742 are hourglass-shaped, which can have a certain limit position correction effect on the cable. A spring is provided in the middle of the spring bidirectional movable trigger rod 744 so that the trigger rod has elastic support on both sides, ensuring that in the initial state, the tensioning wheel 73 and the tensioning adjustment wheel 742 are pushed to have a certain tension on both sides of the cable. Taking the tensioning force on one side of the tensioning wheel 73 as an example, it is explained The specific adaptive tensioning adjustment process is as follows: when the tension on one side of the tensioning wheel 73 is too large, the tensioning wheel 73 moves inward to squeeze the spring bidirectional movable trigger rod 744, so that the trigger rod pushes the contact roller 7431 to drive the adjustment slider 743 to slide toward the cable position on the other side. At this time, the diamond frame 741 is deformed to cause the tensioning adjustment wheel 742 to increase the tension on the other side of the cable, and relax the excessive tension of the tensioning wheel 73. The entire tensioning adjustment process is a dynamic adjustment process, and multiple adjustments are made according to the tension of the cable to ensure that the cable tension on both sides of the pulley 72 always maintains a dynamic balance, making the cable movement smoother and more stable.

[0024] Example 5 Please refer to Figures 1 to 14 Based on the fourth embodiment, this embodiment further proposes a method for using a ship crane with a cable limiting mechanism, comprising the following steps: Step 1: Unwind the cable 5 by lifting the unwinding device 4 to move the hook assembly 7 downward, fix the object to be lifted to the hook 71 below the hook assembly 7, and slowly rewind the cable 5 by lifting the unwinding device 4 to move the hook assembly 7 upward for lifting; In step 2, when the cable is twisted and deflected during the lifting process, the cable limit frame 63 will adaptively deflect as the cable deflects, and drive the cable swing balance frame 62 to adapt to the twisting of the cable and deflect. The outer inclined wing plate 1 623 will squeeze the return spring rod 1 624 and the double-headed inclined telescopic rod 661 to elastically buffer the twisting of the cable. After being squeezed by the inclined wing plate 1 623, the lower end inclined surface of the double-headed inclined telescopic rod 661 gradually rises along the inclined surface of the inclined wing plate 1 623, and the upper end inclined surface of the double-headed inclined telescopic rod 661 will push the inclined surface of the inclined wing plate 2 641 to move the inclined wing plate 2 641 in the opposite direction to the deflection of the cable swing balance frame 62, providing compensation support for the cable in the direction of the anti-twisting deviation, and dynamically balancing the twisting deviation of the cable caused by shaking in time, so that the cable can recover stability faster. Step 3: When the cable is twisted and deflected, driving the cable swing balance frame 62 to adaptively deflect, the cable will come into contact with the lubricating nozzle 6261 on the side of the positioning recessed box 626. As the cable moves, the friction lubricating ball 6262 is rubbed and rolled, and the lubricating oil stored in the positioning recessed box 626 is evenly applied to the surface of the cable, thereby reducing the friction between the cable and the fixed pulley 61. Step four, finally, when the hook assembly 7 successfully lifts the object, the crane base 2 and telescopic arm 3 cooperate to transport the object to the appropriate position, and the lifting and unwinding device 4 slowly unwinds the cable 5, so that the hook assembly 7 moves down to lower the object, and after canceling the fixation between the object and the hook 71, the lifting and transportation of the object is completed.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and that the scope of protection of the present invention 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 arm (3) movably mounted above the crane base (2), a lifting and rewinding device (4) provided on one side of the telescopic arm (3), a cable (5) provided on the outer surface of the lifting and rewinding device (4), and characterized in that: An arm head assembly (6) is fixedly mounted on one end of the telescopic arm (3), a hook assembly (7) is arranged below the arm head assembly (6), a fixed pulley (61) is arranged above the arm head assembly (6), a cable swing balance frame (62) is arranged below the arm head assembly (6), a cable limit frame (63) is arranged on one side of the cable swing balance frame (62), a cable reset push plate (64) is arranged above the cable swing balance frame (62), a spring telescopic sleeve (66) is symmetrically fixedly mounted on the inner surface of the arm head assembly (6), a pulley (72) is rotatably mounted below the inner surface of the hook assembly (7), and a tension adjustment plate (74) is arranged above the pulley (72).

2. A ship crane with a cable limiting mechanism according to claim 1, characterized in that: The outer surface of the fixed pulley (61) contacts the outer surface of the cable (5); a swing support frame (622) is provided below one side of the cable swing balance frame (62) close to the cable limit frame (63); a swing limit frame (621) is provided below 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) close to the cable limit frame (63) is rotatably connected to the middle inner portion 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 limit frame (621).

3. The ship crane with a cable limiting mechanism according to claim 1, characterized in that: An inclined wing plate 1 (623) is symmetrically fixedly mounted on the outer surface of the cable swing balance frame (62), and a return spring rod 1 (624) is provided on one side of the inclined wing plate 1 (623). One end of the sleeve of the return spring rod 1 (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 1 (624) is in contact with the side surface of the inclined wing plate 1 (623).

4. The ship crane with a cable limiting mechanism according to claim 1, characterized in that: The upper end of the cable limit frame (63) is hinged to the side surface of the cable swing balance frame (62), and a small cam (631) and a groove wheel (632) are rotatably installed inside the cable limit frame (63), and the small cam (631) and the groove wheel (632) are adapted in size, and the outer surfaces of the small cam (631) and the groove wheel (632) are in contact with the outer surface of the cable (5) respectively.

5. The 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 mounted with a second inclined wing plate (641), and one side of the second inclined wing plate (641) is provided with a second reset spring rod (642), one end of the sleeve of the second reset spring rod (642) is fixedly connected to the side surface of the arm head assembly (6), and one end of the telescopic rod of the second reset spring rod (642) is fixedly connected to the side surface of the second inclined wing plate (641).

6. The ship crane with a cable limiting mechanism according to claim 1, characterized in that: A double-headed inclined telescopic rod (661) is slidably installed inside the spring telescopic sleeve (66), and a spring is fixedly installed inside the spring telescopic sleeve (66). One end of the spring is fixedly connected to the gasket surface of the double-headed inclined telescopic rod (661), and the upper end inclined surface of the double-headed inclined telescopic rod (661) contacts the lower surface of the inclined wing plate 2 (641), and the lower end inclined surface of the double-headed inclined telescopic rod (661) contacts the upper surface of the inclined wing plate 1 (623).

7. The 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 recessed box (626) is fixedly mounted on one side of the inner surface of the cable swing balance frame (62), lubricating oil nozzles (6261) are symmetrically fixedly mounted on both sides of the inner surface of the positioning recessed box (626), and a lubricating ball (6262) is movably mounted inside the lubricating oil nozzle (6261), a buffer plate (6263) is fixedly mounted on the middle of the inner surface of the positioning recessed box (626), and 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.

8. The ship crane with a cable limiting mechanism according to claim 1, characterized in that: A hook (71) is fixedly mounted on the bottom of the hook assembly (7), an outer surface of the pulley (72) contacts the outer surface of the cable (5), and a tensioning wheel (73) is movably mounted on one side of the hook assembly (7) close to the cable limit frame (63), and an outer surface of the tensioning wheel (73) contacts the outer surface of the cable (5).

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

10. The ship crane with a cable limiting mechanism according to claim 9, characterized in that: A tensioning adjustment wheel (742) is rotatably mounted on the middle portion of the rhombus frame (741) in an upper and lower symmetrical manner. A contact roller (7431) is rotatably mounted on one end of the rhombus frame (741) connected to the adjustment slider (743). A spring bidirectional movable trigger rod (744) is fixedly mounted on a side of the tensioning adjustment plate (74) close to the tensioning wheel (73). Both ends of the trigger rod of the spring bidirectional movable trigger rod (744) are in contact with the contact roller (7431) and the side surface of the tensioning wheel (73), respectively.

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