A cantilever crane

Abstract

The present invention provides a cantilever crane, comprising a vertical support arm and a horizontal support arm, wherein the horizontal support arm is arranged at the top of the outer surface of the vertical support arm, and a rotating traction part is arranged between the vertical support arm and the horizontal support arm, and the rotating traction part can drive the horizontal support arm to rotate and swing; the horizontal support arm is in an I-shape, and a translation mechanism is arranged on the horizontal support arm, and the translation mechanism can move horizontally along the trajectory of the horizontal support arm. When in use, a self-locking device is arranged in the translation mechanism, and when the translation mechanism moves to transport goods, the self-locking device is retracted into the interior of the translation mechanism. When the translation mechanism stops, the self-locking device pops out of the translation mechanism and contacts the wall of the horizontal support arm, and fixes the position of the translation mechanism by friction and pressure, thereby avoiding or reducing the movement of the translation mechanism under the action of inertia, thereby achieving the effect of improving the accuracy of cargo delivery position and improving safety.

Description

Technical Field

[0001] The present invention relates to the technical field of cantilever cranes, in particular to a cantilever crane. Background Art

[0002] The picking device of a cantilever crane is hung at the end of the arm or on a lifting trolley that can run along the jib. The jib can rotate. Generally, a jib crane that cannot pitch is called a cantilever crane.

[0003] The jib crane's trolley uses a motor-driven roller to move the trolley horizontally on the crossarm, mobilizing the suspended cargo. The motor driving the trolley typically lacks a self-locking device. Suspended cargo is often heavy, and when the trolley comes to a stop, the cargo's inertia causes the trolley to continue moving, resulting in inaccurate positioning and potential risks. Furthermore, the trolley is prone to slipping during loading and unloading due to the swaying of the cargo. This can easily damage the motor if its own traction forces restrict its movement.

[0004] To this end, the present application proposes a cantilever crane for achieving self-locking of the lifting trolley, thereby improving the accuracy and safety of cargo transportation. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a cantilever crane for solving the problem mentioned in the prior art that the crane will slide after being counterweighted.

[0006] To achieve the above-mentioned and other related objects, the present invention provides a cantilever crane, comprising a vertical support arm and a horizontal support arm, wherein the horizontal support arm is arranged on the top of the outer surface of the vertical support arm, and a rotating traction portion is provided between the vertical support arm and the horizontal support arm, wherein the rotating traction portion can drive the horizontal support arm to rotate and swing;

[0007] The horizontal support arm is in an I-shape, and a translation mechanism is provided on the horizontal support arm. The translation mechanism can move horizontally along the trajectory of the horizontal support arm. A lifting mechanism is provided at the bottom of the translation mechanism, and the lifting mechanism moves with the movement of the translation mechanism.

[0008] The translation mechanism is provided with a driving cable connected to an external controller;

[0009] The translation mechanism is provided with a self-locking device, which can pop out and contact the wall surface of the horizontal support arm to limit the position of the translation mechanism.

[0010] Preferably, the translation mechanism includes a translation drive unit, a motor is provided inside the translation drive unit, and two protective covers are provided on the side of the translation drive unit, the two protective covers are respectively located on both sides of the horizontal support arm, and the two protective covers are connected to each other;

[0011] A driving roller is provided inside the protective cover near the translation drive unit, the outer surface of the driving roller abuts against the inner bottom of the horizontal support arm, and the driving roller can be driven to rotate by the motor inside the translation drive unit;

[0012] The self-locking device extends from the interior of the translation drive portion to the interior of the protective cover. The self-locking device can be extended and retracted inside the protective cover. The self-locking device contacts the outer surface of the horizontal support arm through the extension and retraction.

[0013] Preferably, the self-locking device includes a magnetic self-locking pin and an electromagnet, wherein the electromagnet is installed inside the translation drive unit, the electromagnet is electrically connected to the motor inside the translation drive unit, and the magnetic self-locking pin extends from the inside of the translation drive unit to the inside of the protective cover;

[0014] The electromagnet can absorb the magnetic self-locking pin when it is not energized, and repel the magnetic self-locking pin when it is energized.

[0015] Preferably, the magnetic self-locking pin includes a pin block, the pin block extends from the interior of the translation drive unit to the interior of the protective cover, and a permanent magnet is provided at one end of the pin block located inside the translation drive unit, and the permanent magnet is provided at the same height as the electromagnet;

[0016] The other end of the pin block is provided with a brake plate, and the brake plate can come into contact with the outer surface of the horizontal support arm after the pin block extends outward.

[0017] Preferably, a magnetic shield is provided on the outer surface of the permanent magnet, and the magnetic shield covers all surfaces of the permanent magnet except the surface facing the electromagnet.

[0018] Preferably, the brake plate and the pin block are connected via a fastener;

[0019] The brake plate is provided with anti-skid grooves on one side facing the horizontal support arm, and a groove is provided on the axis of the brake plate facing the horizontal support arm, and a fastener is provided in the groove.

[0020] Preferably, a strip-shaped limiting groove is provided at the axis of the pin block, and a vertical sliding rod is provided at the position where the pin block passes through the translation driving portion, and the sliding rod passes through the limiting groove to limit the pin block.

[0021] Preferably, rotatable anti-friction rollers are horizontally provided on the opposite surfaces of the protective covers on both sides, and the anti-friction rollers are in contact with the edges of the horizontal support arms.

[0022] Preferably, a cable pulling member is provided on the side of the horizontal support arm, and the driving cable is suspended at the bottom of the cable pulling member.

[0023] Preferably, the cable traction member includes a slide rail, a plurality of horizontally movable hooks are suspended at the bottom of the slide rail, and the drive cables are suspended in the hooks.

[0024] As described above, the cantilever crane of the present invention has the following beneficial effects:

[0025] 1. The present invention provides a self-locking device in the translation mechanism. When the translation mechanism is moving to transport cargo, the self-locking device retracts into the interior of the translation mechanism. When the translation mechanism stops, the self-locking device pops out of the translation mechanism and contacts the wall of the horizontal support arm. The position of the translation mechanism is fixed through friction and pressure, preventing or reducing movement of the translation mechanism due to inertia, thereby achieving the effect of improving the accuracy of cargo delivery and enhancing safety.

[0026] 2. The present invention disposes a magnetic self-locking pin and an electromagnet inside the translation drive unit, with one end of the electromagnet extending into the interior of the protective cover and connected to the motor in the translation drive unit. When the motor in the translation drive unit is energized and the electromagnet is de-energized, the magnetic self-locking pin is attracted to the electromagnet by its own magnetism. When the motor stops working, the electromagnet is energized to generate magnetism that exerts a repulsive force on the magnetic self-locking pin, causing the end of the magnetic self-locking pin to contact the wall surface of the horizontal support arm, exerting pressure and friction, thereby maintaining the position of the translation mechanism stable and achieving the effect of self-locking when the motor stops working.

[0027] 3. The present invention provides a horizontal anti-friction roller inside the horizontal support arm. The anti-friction roller contacts the edge of the horizontal support arm, thereby preventing surface friction between the protective cover and the horizontal support arm when the protective cover moves, thereby achieving the effects of extending service life and reducing heat generation.

[0028] 4. The present invention provides a slide rail on the side of the horizontal support arm and a hook at the bottom of the slide rail to suspend the drive cable. When the translation mechanism moves horizontally, the hook moves under the traction of the drive cable and always supports the drive cable, thereby preventing the drive cable from being entangled with itself and entangled with the cargo, thereby achieving the effect of protecting the drive cable and further improving safety.

[0029] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Shown is a schematic structural diagram of the present invention.

[0031] Figure 2Shown is a structural schematic diagram of the translation mechanism of the present invention.

[0032] Figure 3 Shown as the present invention Figure 2 A magnified schematic diagram of the structure at point A.

[0033] Figure 4 Shown is a structural side view of the translation mechanism of the present invention.

[0034] Figure 5 Shown is a structural cross-sectional view of the translation drive unit of the present invention.

[0035] Figure 6 Shown is a schematic structural diagram of the self-locking pin of the present invention.

[0036] Figure 7 Shown is a schematic structural diagram of the permanent magnet of the present invention.

[0037] Figure 8 Shown is a structural cross-sectional view of the self-locking pin of the present invention.

[0038] Component number description:

[0039] 1. Vertical support arm; 2. Horizontal support arm; 3. Rotary traction unit; 4. Translation mechanism; 41. Translation drive unit; 42. Protective cover; 43. Drive roller; 44. Anti-friction roller; 45. Self-locking device; 451. Magnetic self-locking pin; 4511. Pin block; 4512. Magnetic shield; 4513. Brake plate; 4514. Permanent magnet; 4515. Limiting slot; 452. Electromagnet; 5. Lifting mechanism; 6. Cable traction member; 7. Drive cable. DETAILED DESCRIPTION

[0040] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0041] See also Figures 1 to 8 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0042] like Figures 1-4 As shown, the present invention provides a cantilever crane comprising a vertical support arm 1 and a horizontal support arm 2. The horizontal support arm 2 is disposed on top of the outer surface of the vertical support arm 1. A rotating traction unit 3 is disposed between the vertical support arm 1 and the horizontal support arm 2, and is hingedly connected to the horizontal support arm 2. A motor is provided on the rotating traction unit 3. When energized, the motor drives the horizontal support arm 2 to rotate and swing, allowing cargo to be moved radially along the vertical support arm 1.

[0043] The horizontal support arm 2 is I-shaped and is provided with a translation mechanism 4, which is suspended from the bottom of the horizontal support arm 2. The translation mechanism 4 can move horizontally along the trajectory of the horizontal support arm 2 and is used to drive the cargo to move horizontally. A lifting mechanism 5 is provided at the bottom of the translation mechanism 4. The lifting mechanism 5 includes an electric hoist with a steel cable wrapped around it. A suspension hook is provided at the bottom of the steel cable for suspending the cargo. A controller is provided on the side of the electric hoist to control the raising and lowering of the suspension hook on the electric hoist. The lifting mechanism 5 moves with the movement of the translation mechanism 4 to drive the cargo to move accordingly.

[0044] The translation mechanism 4 is provided with a driving cable 7 connected to an external controller for controlling the operation of the device and supplying power to the device.

[0045] The translation mechanism 4 is provided with a self-locking device 45. When the translation mechanism 4 stops, the self-locking device 45 pops out and contacts the wall of the horizontal support arm 2 to limit the position of the translation mechanism 4. The self-locking device 45 is used to position the translation mechanism 4 through the friction and pressure it provides, ensuring that the translation mechanism 4 can maintain a stable position after stopping.

[0046] like Figure 2 、 Figure 3 and Figure 4 As shown, in some embodiments, the translation mechanism 4 of the present invention includes a translation drive unit 41. A motor, such as a servo motor, is disposed within the translation drive unit 41 to drive the translation mechanism 4 to move horizontally on the horizontal support arm 2. Two protective covers 42 are disposed on the sides of the translation drive unit 41. The two protective covers 42 are located on either side of the horizontal support arm 2 and are interconnected, so that the two protective covers 42 are suspended as a whole at the bottom of the horizontal support arm 2.

[0047] A drive roller 43 is located inside the protective cover 42 near the translation drive unit 41. This drive roller 43 is connected to a servo motor within the translation drive unit 41, which drives the drive roller 43 to rotate. The outer surface of the drive roller 43 contacts the inner bottom of the horizontal support arm 2. Driven by the servo motor within the translation drive unit 41, the drive roller 43 drives the entire translation mechanism 4 along the path of the horizontal support arm 2.

[0048] The self-locking device 45 extends from the inside of the translation drive part 41 to the inside of the protective cover 42. The self-locking device 45 can be extended and retracted inside the protective cover 42. The self-locking device 45 contacts the outer surface of the horizontal support arm 2 through extension and retraction to increase the friction and pressure between the self-locking device 45 and the horizontal support arm 2, so that the translation mechanism 4 can be stopped stably.

[0049] like Figure 5 As shown, in some embodiments, the self-locking device 45 of the present invention includes a magnetic self-locking pin 451 and an electromagnet 452. The electromagnet 452 is mounted inside the translation drive unit 41 and is electrically connected to the motor inside the translation drive unit 41. The magnetic self-locking pin 451 extends from the interior of the translation drive unit 41 to the interior of the protective cover 42. When energized, the electromagnet 452 generates magnetism. The magnetism generated by the electromagnet 452 repels the magnetism of the magnetic self-locking pin 451, causing the magnetic self-locking pin 451 to move toward the horizontal support arm 2, thereby applying pressure and friction to the end of the magnetic self-locking pin 451 and the horizontal support arm 2 to avoid interference. When the electromagnet 452 is de-energized, the magnetic self-locking pin 451, under the influence of magnetism, attracts the iron core of the electromagnet 452, causing it to move toward the electromagnet 452, releasing the contact between the magnetic self-locking pin 451 and the horizontal support arm 2. The connection between the electromagnet 452 and the servo motor is a two-way switch, and by changing the direction of the switch, the power supply of the servo motor and the power supply of the electromagnet 452 are controlled respectively.

[0050] like Figure 6 and Figure 7 As shown, in some embodiments, the magnetic self-locking pin 451 of the present invention includes a pin block 4511, which extends from the interior of the translation drive unit 41 to the interior of the protective cover 42. A permanent magnet 4514 is provided at one end of the pin block 4511 located inside the translation drive unit 41, and the permanent magnet 4514 is arranged at the same height as the electromagnet 452. Therefore, when the electromagnet 452 is not energized, the permanent magnet 4514 can attract the iron core of the electromagnet 452, causing the pin block 4511 to slide toward the electromagnet 452. When the electromagnet 452 is energized, the magnetic force generated by the electromagnet 452 will repel the permanent magnet 4514, pushing the pin block 4511 away from the electromagnet 452.

[0051] A brake plate 4513 is provided at the other end of the pin block 4511. As the pin block 4511 moves, the brake plate 4513 comes into contact with the outer surface of the horizontal support arm 2 and, under the action of magnetic repulsion, applies pressure to the wall of the horizontal support arm 2. The friction and pressure of the brake plate 4513 help position the translation mechanism 4 after it stops, or keep it away from the wall of the horizontal support arm 2, thus avoiding obstruction to the movement of the translation mechanism 4.

[0052] like Figure 7 As shown, in some embodiments of the present invention, a magnetic shield 4512 is provided on the outer surface of the permanent magnet 4514. The magnetic shield 4512 covers all surfaces of the permanent magnet 4514 except the surface facing the electromagnet 452. This prevents magnetic attraction between the periphery of the permanent magnet 4514 and the housing of the translation drive unit 41, so that the permanent magnet 4514 can only generate magnetic force with the electromagnet 452.

[0053] like Figure 8 As shown, in some embodiments of the present invention, the brake plate 4513 and the pin block 4511 are connected by fasteners, so that the wearing part of the brake plate 4513 can be easily disassembled and replaced after being damaged.

[0054] The side of brake plate 4513 facing horizontal support arm 2 is provided with anti-slip grooves to increase friction between the brake plate 4513 and horizontal support arm 2. A groove is provided on the axis of the side of brake plate 4513 facing horizontal support arm 2, and fasteners such as bolts are positioned in the groove. Over long-term use, the ends of brake plate 4513 will gradually wear. Placing fasteners in the groove can reduce the possibility of fastener friction.

[0055] like Figure 6-Figure 8 As shown, in some embodiments of the present invention, a strip-shaped limiting groove 4515 is provided at the axis of the pin block 4511. A vertical slide rod is provided where the pin block 4511 passes through the translation drive unit 41. The slide rod passes through the limiting groove 4515 to limit the position of the pin block 4511. When the pin block 4511 telescopically moves, the slide rod and the limiting groove 4515 cooperate to better maintain the stability of the movement of the pin block 4511. To further enhance the position limiting effect of the slide rod on the pin block 4511, the diameter of the slide rod is equal to the width of the limiting groove 4515.

[0056] like Figure 2 and Figure 4 As shown, in some embodiments of the present invention, rotatable anti-friction rollers 44 are horizontally disposed on opposing surfaces of the protective covers 42 on both sides. The anti-friction rollers 44 contact the edges of the horizontal support arms 2. The anti-friction rollers 44 convert the hard friction between the inner wall of the protective cover 42 and the outer surface of the horizontal support arm 2 into rolling friction, thereby reducing wear on the equipment and increasing its service life.

[0057] like Figure 1 As shown, in some embodiments of the present invention, a cable pulling member 6 is provided on the side of the horizontal support arm 2. The cable pulling member 6 is welded to the side of the horizontal support arm 2 via a crossbar. The drive cable 7 is suspended from the bottom of the cable pulling member 6, thereby supporting the drive cable 7 and preventing the drive cable 7 from falling excessively and pulling on the translation mechanism 4.

[0058] It is noteworthy that the cable pulling member 6 of the present invention comprises a slide rail, the top of which is flush with the top of the horizontal support arm 2 and welded to it via a crossbar. Several horizontally movable hooks are suspended from the bottom of the slide rail, located outside the translation mechanism 4. Drive cables 7 are suspended from these hooks. When the translation mechanism 4 moves horizontally, the hooks, pulled by the drive cables 7, move with the translation mechanism 4, thereby maintaining the shape of the drive cables 7 and preventing them from becoming entangled with themselves or with the cargo.

[0059] In summary, the cantilever crane of the present invention is equipped with a self-locking device 45 in the translation mechanism 4. When the translation mechanism 4 moves to transport goods, the self-locking device 45 is retracted into the interior of the translation mechanism 4. When the translation mechanism 4 stops, the self-locking device 45 will pop out from the translation mechanism 4 and come into contact with the wall of the horizontal support arm 2. The position of the translation mechanism 4 is fixed by friction and pressure, thereby avoiding or reducing the movement of the translation mechanism 4 under the action of inertia, thereby achieving the effect of improving the accuracy of the cargo delivery position and improving safety.

[0060] The present invention arranges a magnetic self-locking pin 451 and an electromagnet 452 inside the translation drive part 41, so that one end of the electromagnet 452 passes through the interior of the protective cover 42, and the electromagnet 452 is connected to the motor in the translation drive part 41. When the motor in the translation drive part 41 is powered on, the electromagnet 452 is powered off, and the magnetic self-locking pin 451 is adsorbed on the electromagnet 452 by its own magnetism. When the motor stops working, the electromagnet 452 is powered on to generate magnetism to exert a repulsive force on the magnetic self-locking pin 451, so that the end of the magnetic self-locking pin 451 contacts the wall of the horizontal support arm 2, exerting pressure and friction, so that the translation mechanism 4 maintains a stable position, thereby achieving the effect of self-locking when the motor stops.

[0061] The present invention arranges a horizontal anti-friction roller 44 inside the horizontal support arm 2, and the anti-friction roller 44 contacts the edge of the horizontal support arm 2, thereby avoiding surface friction between the protective cover 42 and the horizontal support arm 2 when the protective cover 42 moves, thereby achieving the effect of increasing service life and reducing heat.

[0062] The present invention arranges a slide rail on the side of the horizontal support arm 2 and arranges a hook at the bottom of the slide rail to suspend the drive cable 7. When the translation mechanism 4 moves horizontally, the hook will move under the traction of the drive cable 7 and always support the drive cable 7, thereby preventing the drive cable 7 from being entangled in itself and entangled on the cargo, thereby achieving the effect of protecting the drive cable 7 and further improving safety.

[0063] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0064] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A cantilever crane, characterized in that: It comprises a vertical support arm (1) and a horizontal support arm (2), wherein the horizontal support arm (2) is arranged on the top of the outer surface of the vertical support arm (1), and a rotating traction part (3) is provided between the vertical support arm (1) and the horizontal support arm (2), and the rotating traction part (3) can drive the horizontal support arm (2) to rotate and swing; The horizontal support arm (2) is in an I-shape, and a translation mechanism (4) is provided on the horizontal support arm (2). The translation mechanism (4) can move horizontally along the trajectory of the horizontal support arm (2). A lifting mechanism (5) is provided at the bottom of the translation mechanism (4), and the lifting mechanism (5) moves with the movement of the translation mechanism (4); The translation mechanism (4) is provided with a driving cable (7) connected to an external controller; The translation mechanism (4) is provided with a self-locking device (45), and the self-locking device (45) can pop out and contact the wall surface of the horizontal support arm (2) to limit the position of the translation mechanism (4); The translation mechanism (4) comprises a translation drive unit (41), a motor is provided inside the translation drive unit (41), and two protective covers (42) are provided on the sides of the translation drive unit (41), the two protective covers (42) are respectively located on both sides of the horizontal support arm (2), and the two protective covers (42) are connected to each other; A driving roller (43) is provided inside the side protective cover (42) close to the translation driving unit (41), the outer surface of the driving roller (43) abuts against the inner bottom of the horizontal support arm (2), and the driving roller (43) can be driven by the motor inside the translation driving unit (41) to rotate; The self-locking device (45) extends from the interior of the translation drive portion (41) to the interior of the protective cover (42), and the self-locking device (45) can be extended and retracted inside the protective cover (42). The self-locking device (45) contacts the outer surface of the horizontal support arm (2) through the extension and retraction. The self-locking device (45) includes a magnetic self-locking pin (451) and an electromagnet (452), wherein the electromagnet (452) is installed inside the translation drive unit (41), the electromagnet (452) is electrically connected to the motor inside the translation drive unit (41), and the magnetic self-locking pin (451) extends from the inside of the translation drive unit (41) to the inside of the protective cover (42); The electromagnet (452) can absorb the magnetic self-locking pin (451) when it is not energized, and repel the magnetic self-locking pin (451) when it is energized.

2. The jib crane according to claim 1, characterized in that: The magnetic self-locking pin (451) comprises a pin block (4511), the pin block (4511) extending from the interior of the translation drive unit (41) to the interior of the protective cover (42), and a permanent magnet (4514) is provided at one end of the pin block (4511) located inside the translation drive unit (41), the permanent magnet (4514) being arranged at the same height as the electromagnet (452); The other end of the pin block (4511) is provided with a brake plate (4513), and the brake plate (4513) can abut against the outer surface of the horizontal support arm (2) after the pin block (4511) extends outward.

3. The jib crane according to claim 2, characterized in that: The outer surface of the permanent magnet (4514) is provided with a magnetic shield (4512), and the magnetic shield (4512) covers all surfaces of the permanent magnet (4514) except the surface facing the electromagnet (452).

4. The jib crane according to claim 3, characterized in that: The brake plate (4513) and the pin block (4511) are connected via fasteners; The brake plate (4513) is provided with anti-skid grooves on one side facing the horizontal support arm (2), and a groove is provided on the axis of the brake plate (4513) on one side facing the horizontal support arm (2), and a fastener is provided in the groove.

5. The jib crane according to claim 3, characterized in that: The axis of the pin block (4511) is provided with a strip-shaped limiting groove (4515), and the pin block (4511) is provided with a vertical sliding rod at the position where the pin block (4511) passes through the translation driving part (41), and the sliding rod passes through the limiting groove (4515) to limit the pin block (4511).

6. The jib crane according to any one of claims 2 to 5, characterized in that: Rotatable anti-friction rollers (44) are horizontally arranged on the opposite surfaces of the protective covers (42) on both sides, and the anti-friction rollers (44) are in contact with the edges of the horizontal support arms (2).

7. The jib crane according to claim 6, characterized in that: A cable pulling member (6) is provided on the side of the horizontal support arm (2), and the driving cable (7) is suspended at the bottom of the cable pulling member (6).

8. The jib crane according to claim 7, characterized in that: The cable traction member (6) comprises a slide rail, a plurality of horizontally movable hooks are suspended at the bottom of the slide rail, and the drive cables (7) are suspended in the hooks.

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