Cargo crane

Abstract

The invention relates to the technical field of cargo hoisting, and discloses a cargo crane which comprises a mounting base, a hoisting mechanism, a traction mechanism and a synchronous rotating mechanism, the hoisting mechanism comprises a first suspension plate arranged on the side, close to the ground, of the end of the mounting base, the first suspension plate is rotationally connected with a first transmission rod, a first winding roller is arranged in the middle of the first transmission rod, a suspension rope is wound around the first winding roller, and a first fixing head is arranged at the free end of the suspension rope; and the traction mechanism comprises extending beams arranged on the two sides of the mounting base, the extending beams are rotationally connected with driven driving rods, second winding rollers are arranged in the middles of the driven driving rods, and tensioning ropes are wound around the outer portions of the second winding rollers. By arranging the two sliding plates and the buffer spring capable of deforming, when the tension of the tensioning rope is too large, the second winding roller can rotate a few circles less than the first winding roller, and therefore the tensioning rope arranged in an inclined mode can be continuously kept in the traction state.

Description

Technical Field

[0001] The invention relates to the technical field of cargo lifting, in particular to a cargo crane. Background Art

[0002] A cargo crane is a multi-action lifting machine used to lift and transport heavy objects in space. It usually requires a suspended device to lift the cargo. It includes bridge cranes, gantry cranes, etc. Bridge cranes are mainly composed of bridge frames, lifting mechanisms, trolley running mechanisms, and large vehicle running mechanisms. They are usually used in indoor places such as workshops and warehouses.

[0003] However, when lifting some large-sized goods, if only the middle part of the goods is fixed, the goods will shake at both ends during the rising process, which will cause the entire crane to shake, thereby creating a safety hazard in the entire lifting process, so it needs to be improved. Summary of the invention

[0004] The present invention provides a cargo crane which solves the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A cargo crane comprises a mounting base, a lifting mechanism, a pulling mechanism and a synchronous rotating mechanism;

[0007] The lifting mechanism comprises a first hanging plate arranged on the end portion of the mounting base close to the ground, the first hanging plate is rotatably connected to the first transmission rod, a first winding roller is arranged in the middle of the first transmission rod, a suspension rope is wound around the outside of the first winding roller, and a first fixed head is arranged at the free end of the suspension rope; a pulling mechanism comprises an extending beam arranged on both sides of the mounting base, the extending beam is rotatably connected to the driven driving rod, a second winding roller is arranged in the middle of the driven driving rod, a tensioning rope is wound around the outside of the second winding roller, and a second fixed head is arranged at the free end of the tensioning rope; a synchronous rotating mechanism is arranged on the side of the mounting base away from the ground, comprising a fixed seat arranged in the middle of the mounting base, the fixed seat is fixedly connected to the guide rod, and sliding plates are slidably connected to the two sides of the guide rod, and the opposite sides of the two sliding plates are respectively connected to the two ends of the buffer spring, and a first vertical plate is arranged on the first vertical plate close to the lifting mechanism of the mounting base, and a An active driving rod that rotates synchronously, the active driving rod is fixedly connected with a first rotating arm, the side of the first rotating arm away from the active driving rod is connected to one end of the first pull rod, and the other end of the first pull rod is rotatably connected to the middle part of the sliding plate close to the lifting mechanism, the mounting base is provided with a second vertical plate on the side away from the lifting mechanism, the second vertical plate is rotatably connected to a passive driving rod that rotates synchronously with the driven driving rod, the passive driving rod is fixedly connected with a second rotating arm, the side of the second rotating arm away from the passive driving rod is connected to one end of the second pull rod, and the other end of the second pull rod is rotatably connected to the middle part of the sliding plate away from the lifting mechanism, when the first rotating arm and the second rotating arm rotate synchronously, the rising speed of the second fixed head is greater than the rising speed of the first fixed head, and when the pulling force applied to the first fixed head is less than the pulling force applied to the second fixed head, the moving distance of the sliding plate close to the lifting mechanism side is greater than the moving distance of the sliding plate away from the lifting mechanism side.

[0008] As a preferred technical solution of the present invention, a first synchronous wheel is provided on the active driving rod, the first synchronous wheel is connected to the second synchronous wheel through a first belt, the second synchronous wheel is fixedly connected to the first transmission rod, a driving motor is provided on the side of the first vertical plate, the output shaft of the driving motor is fixedly connected to the first driving gear, and the first driving gear is meshedly connected to the first driven gear fixedly connected to the active driving rod.

[0009] As a preferred technical solution of the present invention, the two second fixed heads are symmetrically arranged relative to the first fixed head, and a span adjustment component for adjusting the distance between the two second fixed heads is arranged on the side of the mounting base. When the first fixed head and the second fixed head are both installed, the side of the tension rope close to the second fixed head is tilted toward the direction of the first fixed head. The span adjustment component includes a telescopic rod arranged on the side of the mounting base, the end of the telescopic rod is fixedly connected to a protruding block, the protruding block is rotatably connected to a tension guide roller that cooperates with the tension rope, and the mounting base is provided with a tension roller that can lock the angle, the tension roller is wound with a tension rope outside, and the free end of the tension rope is connected to the protruding block.

[0010] As a preferred technical solution of the present invention, the ends of the first rotating arm and the second rotating arm are both slidably connected to a slider, the side of the slider is fixedly connected to a cross bar rotatably connected to the first pull rod and the second pull rod, fixed blocks fixedly connected to the first rotating arm and the second rotating arm are provided on both sides of the slider, the fixed blocks are rotatably connected to an adjusting screw threadedly connected to the slider, and a counterweight head is provided at one end of the first rotating arm and the second rotating arm away from the slider.

[0011] As a preferred technical solution of the present invention, a second suspension plate is provided on the side of the mounting base close to the second vertical plate, the second suspension plate is rotatably connected to the second transmission rod, a third synchronous wheel is provided on the passive drive rod, the third synchronous wheel is connected to the fourth synchronous wheel through the second belt, the fourth synchronous wheel is fixedly connected to the second transmission rod, a third suspension plate is provided on the side of the mounting base close to the extended beam, the third suspension plate is rotatably connected to the third transmission rod that rotates synchronously with the driven drive rod, a fifth synchronous wheel is provided in the middle of the second transmission rod, the fifth synchronous wheel is connected to the sixth synchronous wheel through the third belt, and the sixth synchronous wheel is fixedly connected to the third transmission rod. Rotating sleeves are provided at both ends of the third transmission rod, the rotating sleeve is rotatably connected to one end of the rotating rod, the other end of the rotating rod is provided with a second driving gear, the second driving gear is meshedly connected to the second driven gear fixedly connected to the driven drive rod, a torsion spring is provided inside the rotating sleeve, and the two ends of the torsion spring are respectively connected to the rotating rod and the third transmission rod.

[0012] The present invention has the following benefits:

[0013] The lifting and lowering of the goods is completed by simultaneously retracting the suspension rope and the tensioning rope, and because the tensioning rope is in a tilted and pulled state, the forward and backward shaking of the goods is reduced. By setting two sliding plates and a deformable buffer spring, when the tension of the tensioning rope is too large, the second winding roller can rotate fewer circles than the first winding roller, so that the tilted tensioning rope can continue to maintain a pulled state. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 The figure is a structural diagram of a cargo crane.

[0016] Figure 2 The figure is a front view of a cargo crane.

[0017] Figure 3 The figure is a schematic diagram of the structure of a lifting mechanism in a cargo crane.

[0018] Figure 4 The figure is a schematic structural diagram of a first rotating arm in a cargo crane.

[0019] Figure 5 The figure is a schematic diagram of the structure of a pulling mechanism in a cargo crane.

[0020] Figure 6 The figure is a schematic diagram of the structure of a synchronous rotating mechanism in a cargo crane.

[0021] Figure 7 The present invention is a structural schematic diagram of synchronous rotation of a passive driving rod and a second transmission rod in a cargo crane.

[0022] Figure 8 The present invention is a structural schematic diagram of synchronous rotation of a third transmission rod and a rotating rod in a cargo crane.

[0023] In the figure: 1, mounting base; 2, lifting mechanism; 3, pulling mechanism; 4, synchronous rotating mechanism; 5, first vertical plate; 6, active driving rod; 7, first rotating arm; 8, driving motor; 9, first driving gear; 10, first driven gear; 11, first synchronous wheel; 12, first belt; 13, second synchronous wheel; 14, first hanging plate; 15, first transmission rod; 16, first winding roller; 17, hanging rope; 18, first fixed head; 19, slider; 20, cross bar; 21, adjusting screw rod; 22, fixed block; 23, counterweight head; 24, extending beam; 25, driven driving rod; 26, second winding roller; 27, tensioning rope; 28, second fixed head; 29, extending block; 30. Telescopic rod; 31. Tension rope; 32. Tension roller; 33. Span adjustment assembly; 34. Fixed seat; 35. Guide rod; 36. Buffer spring; 37. Sliding plate; 38. Second pull rod; 39. First pull rod; 40. Second vertical plate; 41. Passive drive rod; 42. Second rotating arm; 43. Third synchronous wheel; 44. Second belt; 45. Second suspension plate; 46. Second transmission rod; 47. Fifth synchronous wheel; 48. Third transmission rod; 49. Sixth synchronous wheel; 50. Third suspension plate; 51. Second driving gear; 52. Second driven gear; 53. Third belt; 54. Rotating sleeve; 55. Rotating rod; 56. Fourth synchronous wheel; 57. Tension guide roller. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In one embodiment, see Figure 1-Figure 8 A cargo crane comprises a mounting base 1, the mounting base 1 is used to fix various lifting devices, the mounting base 1 can be fixed on a traveling crane, so that the traveling crane drives the mounting base 1 to move in a horizontal direction, and also comprises a lifting mechanism 2, a pulling mechanism 3 and a synchronous rotation mechanism 4, the lifting mechanism 2 and the pulling mechanism 3 are both arranged at the left end of the mounting base 1, and the synchronous rotation mechanism 4 is arranged above the mounting base 1;

[0026] The lifting mechanism 2 includes a first hanging plate 14 arranged at the left end of the lower surface of the mounting base 1, two first hanging plates 14 are vertically arranged at the front and rear sides of the lower surface of the mounting base 1, the lower end of the first hanging plate 14 is rotatably connected to a first transmission rod 15 arranged in a front-to-rear direction, the front and rear sides of the first transmission rod 15 are provided with a first winding roller 16, the outside of the first winding roller 16 is wound with a suspension rope 17, the lower end of the suspension rope 17 is connected to the front and rear sides of the upper surface of the first fixed head 18, and the first fixed head 18 is used to fix the middle part of the upper surface of the cargo;

[0027] The pulling mechanism 3 is arranged at the left end of the front and rear sides of the mounting base 1, and includes an extension beam 24 fixedly connected to the mounting base 1 and arranged in a front-to-back direction, the end of the extension beam 24 is rotatably connected to a driven driving rod 25 arranged in a left-to-right direction, the middle part of the driven driving rod 25 is fixedly connected to a second winding roller 26, the outside of the second winding roller 26 is wound with a tension rope 27, and the lower end of the tension rope 27 is connected to the middle part of the upper surface of the second fixed head 28;

[0028] The synchronous rotation mechanism 4 includes a fixed seat 34 arranged in the middle of the upper surface of the mounting base 1, the fixed seat 34 is fixedly connected to the left and right ends of the guide rod 35 arranged in the left and right directions, the two guide rods 35 are respectively arranged on the front and rear sides of the mounting base 1, and sliding plates 37 arranged in the front and rear directions are slidably connected on the left and right sides of the guide rod 35. A buffer spring 36 is arranged between the two sliding plates 37. The buffer spring 36 is sleeved on the outside of the guide rod 35. The left and right ends of the buffer spring 36 are respectively fixedly connected to the left and right sliding plates 37. A first vertical plate 5 is arranged at the left end of the upper surface of the mounting base 1. The two first vertical plates 5 are vertically arranged on the front and rear sides of the mounting base 1. The upper ends of the first vertical plates 5 are rotatably connected There is an active driving rod 6 arranged in a front-to-back direction, the active driving rod 6 and the first transmission rod 15 rotate synchronously, the active driving rod 6 is fixedly connected to the middle part of the first rotating arm 7, the end of the first rotating arm 7 away from the active driving rod 6 is rotatably connected to the left end of the first pull rod 39, the right end of the first pull rod 39 is rotatably connected to the middle part of the left sliding plate 37, a second vertical plate 40 is arranged at the right end of the upper surface of the mounting base 1, the two second vertical plates 40 are vertically arranged on the front and rear sides of the mounting base 1, a passive driving rod 41 that rotates synchronously with the driven driving rod 25 is rotatably connected to the upper end of the second vertical plate 40, the passive driving rod 41 is fixedly connected to the middle part of the second rotating arm 42, and the second rotating arm 42 is away from the passive driving rod 41. One side is rotatably connected to the right end of the second pull rod 38, and the left end of the second pull rod 38 is rotatably connected to the middle part of the right sliding plate 37. Therefore, when the first rotating arm 7 rotates, the left and right sliding plates 37 are pulled to move left and right synchronously through the first pull rod 39, so that the second rotating arm 42 on the right side is rotated through the second pull rod 38, so that the first transmission rod 15 and the driven drive rod 25 can achieve the effect of synchronous rotation, and when the first rotating arm 7 and the second rotating arm 42 rotate at the same time, the rising speed of the second fixed head 28 will be faster than the rising speed of the first fixed head 18. When the pulling force on the first fixed head 18 is less than the pulling force on the second fixed head 28, it is close to one side of the lifting mechanism 2 The moving distance of the sliding plate 37 is greater than the moving distance of the sliding plate 37 on the side away from the lifting mechanism 2. At this time, the buffer spring 36 is stretched, that is to say, after the first rotating arm 7 on the left rotates one circle, the second rotating arm 42 will rotate synchronously with the first rotating arm 7 again, so that the second rotating arm 42 rotates one circle less than the first rotating arm 7, which solves the problem of the second fixed head 28 rising too fast. Because the inclination angle of the tensioning rope 27 changes, the tensioning rope 27 needs to be retracted faster than the suspension rope 17 to achieve a continuous tensioning effect, thereby avoiding the goods from shaking back and forth. Therefore, it is necessary to design the process of stopping the second rotating arm 42 to compensate for the change in the retraction speed of the tensioning rope 27.

[0029] In one case of the present embodiment, a first synchronous wheel 11 is fixedly connected to the middle of the active driving rod 6, the first synchronous wheel 11 is connected to the second synchronous wheel 13 through the first belt 12, and the second synchronous wheel 13 is fixedly connected to the first transmission rod 15, so that the active driving rod 6 and the first transmission rod 15 can achieve the effect of synchronous rotation, and a driving motor 8 is arranged in the middle of the first vertical plate 5 on the front side, the output shaft of the driving motor 8 is fixedly connected to the first driving gear 9, the first driving gear 9 is meshed and connected to the first driven gear 10, and the first driven gear 10 is fixedly connected to the front end of the active driving rod 6 on the front side, so the driving motor 8 can realize the rotation of the active driving rod 6 through gear transmission, and then the active driving rod 6 rotates the first winding roller 16 through belt transmission, and at the same time, the active driving rod 6 rotates the second winding roller 26 through the synchronous rotation mechanism 4, so that the driving motor 8 can simultaneously drive the first winding roller 16 and the second winding roller 26 to rotate.

[0030] In one case of the present embodiment, the front and rear second fixed heads 28 are symmetrically arranged relative to the first fixed head 18, and clamping heads can be arranged on the first fixed head 18 and the second fixed head 28, so that they can be fixed to the middle of the cargo through the first fixed head 18, and the second fixed head 28 is fixed to the front and rear ends of the cargo, and a span adjustment component 33 is arranged on the side of the mounting base 1, and the span adjustment component 33 can adjust the distance between the front and rear second fixed heads 28, so that after the first fixed head 18 and the second fixed head 28 are installed, the bottom of the tensioning rope 27 is inclined toward the direction of the cargo, so that the tensioning rope 27 maintains the pulling effect. The span adjustment assembly 33 includes a telescopic rod 30 arranged on the front and rear sides of the mounting base 1. The telescopic rod 30 is arranged in a front-to-back direction. The protruding end of the telescopic rod 30 is fixedly connected to an extension block 29. The extension block 29 is rotatably connected to a tensioning guide roller 57 arranged in a left-right direction. The tensioning guide roller 57 will lift the tensioning rope 27 to play a guiding role. Since the telescopic rod 30 is in a cantilever beam state at this time, the strength requirement of the telescopic rod 30 is relatively high. Therefore, a tensioning roller 32 is arranged above the front and rear sides of the mounting base 1. The tensioning rope 31 is wound around the outside of the tensioning roller 32. The free end of the tensioning rope 31 is connected to the upper surface of the extension block 29, so that the tensioning rope 31 tightens the telescopic block, thereby improving the stability of the telescopic rod 30. In addition, an angle locking device is arranged inside the tensioning roller 32, so that the tensioning rope 31 can remain in a taut state after the telescopic rod 30 is completely extended.

[0031] In one case of the present embodiment, a slider 19 is slidably connected to one side of the first rotating arm 7 and the second rotating arm 42, a cross bar 20 is arranged between the front and rear sliders 19, the middle part of the cross bar 20 is rotatably connected to the end of the first pull rod 39 and the second pull rod 38, and fixed blocks 22 fixedly connected to the first rotating arm 7 and the second rotating arm 42 are arranged on the left and right sides of the slider 19, and the fixed block 22 is rotatably connected to an adjusting screw rod 21 threadedly connected to the slider 19. Therefore, the position of the slider 19 on the first rotating arm 7 and the second rotating arm 42 can be adjusted by adjusting the screw rod 21, thereby changing the rotation radius of the cross bar 20, that is, changing the lateral displacement distance of the sliding plate 37, and in order to maintain the rotation stability of the first rotating arm 7 and the second rotating arm 42, a counterweight head 23 is arranged on the side of the first rotating arm 7 and the second rotating arm 42 away from the slider 19, and the position of the slider 19 is changed by adjusting the screw rod 21, so that the installation lowering of the first rotating arm 7 and the second rotating arm 42 can be reduced, and when an error occurs, it can be solved by adjusting the position of the slider 19.

[0032] In one case of the present embodiment, a second suspension plate 45 is provided on the right side of the lower surface of the mounting base 1, the second suspension plate 45 is vertically provided on the front and rear sides of the mounting base 1, and the second transmission rod 46 provided in the front and rear directions is rotatably connected at the lower end of the second suspension plate 45, and the third synchronous wheel 43 is fixedly connected to the middle part of the passive driving rod 41, and the third synchronous wheel 43 is connected to the fourth synchronous wheel 56 through the second belt 44, and the fourth synchronous wheel 56 is fixedly connected to the front and rear sides of the second transmission rod 46, and a third suspension plate 50 fixedly connected to the mounting base 1 is provided on the right side of the extended beam 24, and the third suspension plate 50 is vertically provided on the front and rear sides of the mounting base 1, and the lower end of the third suspension plate 50 is rotatably connected to the rotating rod 55 provided in the front and rear directions, and a second driving gear 51 is provided at one end of the rotating rod 55 away from the mounting base 1, and the second driving gear 51 is meshedly connected to the second driven gear 52, and the second driven gear 52 is fixedly connected to the end of the driven driving rod 25, and the rotating rod 55 is rotatably connected to the rotating sleeve 54 on the side close to the center of the mounting base 1, and the rotating sleeve 54 is fixedly connected to the rotating sleeve 54. The front and rear ends of the third transmission rod 48 set in the front and rear directions are fixedly connected, and a torsion spring is arranged inside the rotating sleeve 54. The torsion spring allows the rotating rod 55 to rotate synchronously with the third transmission rod 48. However, when the transmitted force value is large, the torsion spring will deform, so that the third transmission rod 48 and the rotating rod 55 can be slightly misaligned by a certain angle, so that the installation fault tolerance of the entire transmission device is higher, and a fifth synchronous wheel 47 is arranged in the middle of the second transmission rod 46. The fifth synchronous wheel 47 is connected to the sixth synchronous wheel 49 through the third belt 53, and the sixth synchronous wheel 49 is fixedly connected to the middle of the third transmission rod 48. Therefore, the passive driving rod 41 drives the second transmission rod 46 to rotate through the belt transmission, the second transmission rod 46 rotates the third transmission rod 48 through the belt transmission, the third transmission rod 48 rotates the rotating rod 55 through the rotating sleeve 54, and the rotating rod 55 rotates the driven driving rod 25 through the gear transmission, thereby achieving the effect of synchronous rotation of the passive driving rod 41 and the driven driving rod 25.

[0033] During the implementation of this embodiment, the mounting base 1 is fixed to the crane at the loading and unloading site, and the mounting base 1 is moved by the crane. First, the first fixed head 18 is fixed to the middle part of the upper surface of the cargo, and the tensioning guide roller 57 is pulled outward so that the distance between the front and rear tensioning guide rollers 57 is larger than the distance between the front and rear sides of the cargo. The telescopic rod 30 is locked, and the second fixed head 28 is fixed to the front and rear ends of the cargo. At this time, the free end of the suspension rope 17 is fixed to the first fixed head 18, and the tensioning rope 27 is fixed to the second fixed head 28, so that the suspension rope 17 and the tensioning rope 27 remain in a taut state, and the installation of the entire lifting equipment is completed.

[0034] The driving motor 8 is started, and the output shaft of the driving motor 8 rotates the active driving rod 6 through gear transmission, and the active driving rod 6 drives the first winding roller 16 to rotate through belt transmission, so that the suspension rope 17 drives the goods to move upward, and at the same time, the active driving rod 6 rotates the passive driving rod 41 through the sliding plate 37 that moves horizontally to the left and right, and the passive driving rod 41 drives the second winding roller 26 to rotate, so that the tensioning rope 27 tightens the front and rear ends of the goods. The goods are mainly pulled up by the suspension rope 17. During the continuous lifting process, the tension of the tensioning rope 27 gradually increases. At this time, the buffer spring 3 6 is stretched. When the stretched length of the buffer spring 36 is greater than the lateral displacement distance of the left sliding plate 37, the first rotating arm 7 on the left will rotate one more circle than the second rotating arm 42 on the right, that is, the first winding roller 16 will rotate several more circles than the second winding roller 26, so that the tensioning rope 27 is in a relaxed state again. As the goods continue to rise, the tensioning rope 27 will be tightened again, and then the tensioning rope 27 will be relaxed again through the deformation of the buffer spring 36. Therefore, during the rising process of the goods, the main pulling force is provided by the suspension rope 17. The tensioning rope 27 tightens the front and rear sides of the goods to prevent the goods from shaking back and forth.

[0035] The present invention is applicable to a cargo crane, which completes the lifting and lowering of cargo by simultaneously retracting a suspension rope 17 and a tensioning rope 27, and because the tensioning rope 27 is in an inclined pulling state, the forward and backward shaking of the cargo is reduced, and by arranging two sliding plates 37 and a deformable buffer spring 36, when the tension of the tensioning rope 27 is too large, the second winding roller 26 can rotate a few fewer circles than the first winding roller 16, so that the inclined tensioning rope 17 can continuously maintain a pulling state.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A cargo crane, characterized in that: It includes a mounting base, a lifting mechanism, a pulling mechanism and a synchronous rotating mechanism; The lifting mechanism comprises a first suspension plate arranged at the end of the mounting base close to the ground, the first suspension plate is rotatably connected to a first transmission rod, a first winding roller is arranged at the middle of the first transmission rod, a suspension rope is wound around the outside of the first winding roller, and a first fixed head is arranged at the free end of the suspension rope; The pulling mechanism comprises an extension beam arranged on both sides of the mounting base, the extension beam is rotatably connected to a driven driving rod, a second winding roller is arranged in the middle of the driven driving rod, a tension rope is wound around the outside of the second winding roller, and a second fixing head is arranged at the free end of the tension rope; The synchronous rotation mechanism is arranged on the side of the mounting base away from the ground, including a fixed seat arranged in the middle of the mounting base, the fixed seat is fixedly connected to the guide rod, and sliding plates are slidably connected to the two sides of the guide rod, and the opposite sides of the two sliding plates are respectively connected to the two ends of the buffer spring, and a first vertical plate is arranged on the side of the mounting base close to the lifting mechanism, and an active driving rod rotating synchronously with the first transmission rod is arranged on the first vertical plate, and the active driving rod is fixedly connected to the first rotating arm, and the side of the first rotating arm away from the active driving rod is connected to one end of the first pull rod, and the other end of the first pull rod is rotatably connected to the middle of the sliding plate close to the lifting mechanism, and the mounting base is away from the lifting mechanism. A second vertical plate is provided on one side of the lifting mechanism, and the second vertical plate is rotatably connected to a passive driving rod which rotates synchronously with the driven driving rod, and the passive driving rod is fixedly connected to a second rotating arm, and the second rotating arm is connected to one end of a second pull rod on a side away from the passive driving rod, and the other end of the second pull rod is rotatably connected to the middle part of the sliding plate away from the lifting mechanism. When the first rotating arm and the second rotating arm rotate synchronously, the rising speed of the second fixed head is greater than the rising speed of the first fixed head. When the pulling force applied to the first fixed head is less than the pulling force applied to the second fixed head, the moving distance of the sliding plate close to the lifting mechanism side is greater than the moving distance of the sliding plate away from the lifting mechanism side.

2. A cargo crane according to claim 1, characterized in that: A first synchronous wheel is arranged on the active driving rod, the first synchronous wheel is connected to a second synchronous wheel through a first belt, the second synchronous wheel is fixedly connected to the first transmission rod, a driving motor is arranged on the side of the first vertical plate, the output shaft of the driving motor is fixedly connected to a first driving gear, and the first driving gear is meshedly connected to a first driven gear fixedly connected to the active driving rod.

3. A cargo crane according to claim 1, characterized in that: The two second fixed heads are symmetrically arranged relative to the first fixed head, and a span adjustment component for adjusting the distance between the two second fixed heads is arranged on the side of the mounting base. When the first fixed head and the second fixed head are both installed, the side of the tensioning rope close to the second fixed head is tilted toward the direction of the first fixed head.

4. A cargo crane according to claim 3, characterized in that: The span adjustment assembly includes a telescopic rod arranged on the side of the mounting base, the end of the telescopic rod is fixedly connected to an extension block, the extension block is rotatably connected to a tensioning guide roller that cooperates with the tensioning rope, and the mounting base is provided with a tensioning roller that can lock the angle, the tensioning roller is wound with a tensioning rope outside, and the free end of the tensioning rope is connected to the extension block.

5. A cargo crane according to claim 1, characterized in that: The ends of the first rotating arm and the second rotating arm are both slidably connected to a slider, and the side of the slider is fixedly connected to a cross bar rotatably connected to the first pull rod and the second pull rod, and fixed blocks fixedly connected to the first rotating arm and the second rotating arm are arranged on both sides of the slider, and the fixed blocks are rotatably connected to an adjusting screw rod threadedly connected to the slider, and a counterweight head is arranged at one end of the first rotating arm and the second rotating arm away from the slider.

6. A cargo crane according to claim 1, characterized in that: A second suspension plate is provided on the side of the mounting base close to the second vertical plate, and the second suspension plate is rotatably connected to the second transmission rod. A third synchronous wheel is provided on the passive drive rod, and the third synchronous wheel is connected to the fourth synchronous wheel through a second belt, and the fourth synchronous wheel is fixedly connected to the second transmission rod. A third suspension plate is provided on the side of the mounting base close to the protruding beam, and the third suspension plate is rotatably connected to the third transmission rod that rotates synchronously with the driven drive rod. A fifth synchronous wheel is provided in the middle of the second transmission rod, and the fifth synchronous wheel is connected to the sixth synchronous wheel through a third belt, and the sixth synchronous wheel is fixedly connected to the third transmission rod.

7. A cargo crane according to claim 6, characterized in that: The two ends of the third transmission rod are provided with rotating sleeves, the rotating sleeve is rotatably connected to one end of the rotating rod, the other end of the rotating rod is provided with a second driving gear, the second driving gear is meshedly connected with a second driven gear fixedly connected to the driven driving rod, and a torsion spring is provided inside the rotating sleeve, and the two ends of the torsion spring are respectively connected to the rotating rod and the third transmission rod.

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