A gantry crane

Abstract

The present invention relates to the technical field of cranes, and specifically to a gantry crane, comprising: an adjusting mechanism is arranged on a crane frame, a lifting mechanism is arranged on the lower side of the adjusting mechanism, and a pocket mechanism is arranged on the lifting mechanism; the present invention can realize adaptive tightening of multiple bundles of steel bars through the pocket assembly in the lifting mechanism, thereby greatly reducing the shaking amplitude of the steel bars during the lifting process; the present invention can realize automatic chain pocketing of multiple bundles of steel bars through the cooperation of the lifting mechanism and the pocket mechanism, thereby greatly simplifying the overall manual operation steps during the steel bar lifting process; the present invention can make the lifting mechanism and the pocket mechanism adapt to bundles of steel bars of different lengths through the adjusting mechanism, thereby improving the flexibility and application scope of the gantry crane in lifting steel bars, and also reducing the cost of the overall lifting operation.

Description

Technical Field

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

[0002] Gantry crane is a variation of bridge crane. Its metal structure is shaped like a door frame and can be moved directly on the ground. Gantry crane can be used to transport construction materials, such as steel bars, precast concrete parts, etc. During the construction process, gantry crane can be used to unload and transport bundles of stacked steel bars. Each bundle of steel bars is usually evenly tied and fixed along the axial direction by multiple steel ropes.

[0003] In the prior art, when a gantry crane is used to lift and transport bundles of steel bars, the crane hook is usually first manually hung on the steel wire rope at the end of the bundle of steel bars, so that the hook drives the steel wire rope to lift the end of the bundle of steel bars upward until one side of the bundle of steel bars is suspended in the air, and then the lifting chain pocket is manually wrapped around the bundle of steel bars near the middle to stabilize the load-bearing, and then the end of the bundle of steel bars is lowered by the hook, and both ends of the chain pocketed on the bundle of steel bars are installed on the hook, and finally, the other side of the bundle of steel bars is also pocketed and installed with a load-bearing chain through another hook on the crane according to the above operation method, so that the crane can lift and transport the bundle of steel bars through the load-bearing chains on both sides of the bundle of steel bars.

[0004] However, the traditional method of transporting bundles of steel bars by lifting them with gantry cranes has the following problems: 1. During the lifting of steel bars, not only are the overall lifting operation steps cumbersome, laborious, and inefficient, but it also requires manual participation throughout the process and the cooperation of the crane to lift the steel bars. When lifting a large number of steel bars, the overall manual operation burden is heavy and the labor cost is high; 2. During the lifting process, in order to facilitate manual wrapping of chain pockets around the surface of multiple bundles of steel bars, the load-bearing chains are usually longer, resulting in a larger overall shaking amplitude of the steel bars during the lifting process, which in turn affects the personal safety of the operators and the stability of the overall lifting of the steel bars. Summary of the invention

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a gantry crane, comprising a placing platform, the placing platform is fixedly arranged on the upper side of the ground, a lifting frame that moves forward and backward is arranged on the ground, an adjusting mechanism is arranged on the lifting frame, a lifting mechanism is arranged on the lower side of the adjusting mechanism, and a sling mechanism is arranged on the lifting mechanism.

[0006] The adjusting mechanism comprises two slings which are symmetrically installed on the lifting frame, and the lower ends of the two slings which are symmetrically installed are commonly provided with an adjusting component.

[0007] The lifting mechanism comprises a return frame which is symmetrically arranged on the lower side of the adjustment component through four slings, the return frame is provided with a lifting component and a lifting component, and the lifting component is provided with a driving component and a supporting component.

[0008] The pocket mechanism comprises a guide rail symmetrically fixedly arranged on the upper side of the return frame, an electric slider that moves left and right is slidably arranged on the guide rail, and a pocket assembly is commonly arranged on the electric slider that is symmetrically arranged front and back.

[0009] Preferably, the lifting frame includes a walking frame symmetrically arranged on the ground, the placing platform is located between the two walking frames, the lower side of the walking frame is provided with moving wheels that are symmetrically rotated front and back through a support, and the upper side of the walking frame is fixed with legs, a crossbeam is commonly fixed between the left and right symmetrical legs, a track is fixedly arranged on the lower side of the crossbeam, a mobile hoist that moves left and right is slidably arranged on the track, and a hook that moves up and down is fixedly arranged on the lower side of the mobile hoist through a sling.

[0010] Preferably, the adjustment component includes a track 2 on which the lower ends of two left-right symmetrical slings are fixedly arranged, a movable sling 2 that moves left-right is symmetrically slidably arranged on the track 2, and a connecting piece is fixedly arranged on the lower side of the movable sling 2 through three left-right symmetrical slings.

[0011] Preferably, the lifting assembly includes a fixed platform fixedly arranged on the inner side of the corresponding return frame, a hydraulic cylinder with a telescopic end passing through the fixed platform is fixedly arranged on the upper side of the fixed platform, a U-shaped frame that moves up and down and has an opening facing downward is fixedly arranged on the telescopic end of the hydraulic cylinder, and guide rods that are slidably connected to the corresponding fixed platform are fixedly arranged symmetrically front and back on the upper side of the horizontal section of the U-shaped frame.

[0012] Preferably, the driving assembly includes a motor 1 fixedly arranged on the lower side of the horizontal section of the corresponding U-shaped frame through a support 2, and a connecting shaft rotatably connected to the U-shaped frame is fixedly arranged on the driving end of the motor 1, and a plurality of gears are evenly fixedly arranged on the connecting shaft front and back.

[0013] Preferably, the supporting assembly includes a plurality of docking shafts uniformly arranged front and rear between front and rear symmetrical vertical sections on the U-shaped frame, and the docking shafts correspond one-to-one with the gears, a plurality of splines 1 are uniformly fixedly arranged on the front end of the docking shaft surface, a limit baffle is fixedly arranged on the front end face of the docking shaft and the corresponding spline 1, a rotating shaft is fixedly arranged on the rear end face of the docking shaft, and the front and rear adjacent limit baffles and the rotating shaft are fixedly connected by a plate member 1, wherein the frontmost limit baffle is fixedly connected to the vertical section on the front side of the U-shaped frame by a rod member 1, and the rearmost rotating shaft is fixedly connected to the vertical section on the rear side of the U-shaped frame by a rod member 2, a rotating sleeve is rotatably arranged on the rotating shaft, and splines 2 corresponding to the splines 1 are uniformly fixedly arranged on the outer surface of the rotating sleeve, and a gear ring rotatably connected to the corresponding rotating shaft and meshing with the corresponding gear is fixedly arranged at the rear end of the rotating sleeve.

[0014] Preferably, the lifting assembly includes a winding wheel 1 that is slidably arranged on the docking shaft and moves back and forth. The winding wheel 1 is provided with a docking groove that is slidably docked with the corresponding spline 1 and spline 2. A hook 2 is fixedly arranged on the lower side of the winding wheel 1 through a sling 5.

[0015] Preferably, the pocket assembly includes a winding wheel 2 which is rotatably arranged on the upper side of the rear electric slider through a U-shaped support with an opening facing upward, a motor 2 which is fixedly arranged on the left side of the U-shaped support and is fixedly connected to the corresponding winding wheel 2 with its driving end, a chain is fixedly arranged on the winding wheel 2, and fixing plates are fixedly arranged on opposite sides of the left and right symmetrical electric sliders, wherein a hook 3 is fixedly arranged on the rear side of the rear fixing plate, and a buckle is fixedly arranged on the front side of the front fixing plate, and the buckle is fixedly connected to the front end of the chain.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention can realize adaptive tightening of multiple bundles of steel bars through the pocket assembly in the lifting mechanism, thereby greatly reducing the shaking amplitude of the steel bars during the lifting process, improving the safety of the overall lifting of the steel bars and the stability of the surrounding positioning.

[0018] 2. The present invention can realize automatic chain pocketing of multiple bundles of steel bars through the cooperation of the lifting mechanism and the pocketing mechanism, thereby greatly simplifying the overall manual operation steps in the process of steel bar lifting, which not only improves the overall lifting efficiency of the steel bars, but also avoids repetitive high-intensity manual operations when lifting a large number of steel bars, reduces the overall manual operation burden, and saves the overall labor cost of steel bar lifting.

[0019] 3. The present invention can make the lifting mechanism and the pocket mechanism adapt to bundles of steel bars of different lengths through the adjustment mechanism, thereby improving the flexibility and application scope of the gantry crane lifting steel bars, and also reducing the cost of the overall lifting operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the crane frame structure.

[0022] Figure 3 It is a schematic diagram of the partial structure of the lifting mechanism.

[0023] Figure 4 It is a partial cross-sectional schematic diagram of the pocket mechanism structure.

[0024] Figure 5 It is a partial cross-sectional schematic diagram of some structures of the lifting component.

[0025] Figure 6 It is a partial cross-sectional schematic diagram of the supporting component structure.

[0026] Figure 7 It is a partial cross-sectional schematic diagram of the structure of the lifting component.

[0027] In the figure: 1, placing table; 2, lifting frame; 21, walking frame; 22, moving wheel; 23, outrigger; 24, crossbeam; 25, track 1; 26, mobile hoist 1; 27, hook 1; 3, adjusting mechanism; 31, adjusting assembly; 311, track 2; 312, mobile hoist 2; 313, connecting piece; 4, lifting mechanism; 41, return frame; 42, lifting assembly; 421, fixed table; 422, hydraulic cylinder; 423, U-shaped frame; 424, guide rod; 43, driving assembly; 431, motor 1; 432, connecting piece Shaft; 433, gear; 44, supporting assembly; 441, docking shaft; 442, spline one; 443, limit baffle; 444, rotating shaft; 445, rotating sleeve; 446, spline two; 447, gear ring; 45, lifting assembly; 451, winding wheel one; 452, docking groove; 453, hook two; 5, pocket mechanism; 51, guide rail; 52, electric slider; 53, pocket assembly; 531, motor two; 532, winding wheel two; 533, chain; 534, fixing plate; 535, buckle; 536, hook three. DETAILED DESCRIPTION

[0028] 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.

[0029] See also Figure 1 A gantry crane comprises a placing platform 1, wherein the placing platform 1 is fixedly arranged on the upper side of the ground, a lifting frame 2 which moves forward and backward is arranged on the ground, an adjusting mechanism 3 is arranged on the lifting frame 2, a lifting mechanism 4 is arranged on the lower side of the adjusting mechanism 3, and a pocket mechanism 5 is arranged on the lifting mechanism 4.

[0030] See also Figure 1 and Figure 2The lifting frame 2 includes a walking frame 21 which is symmetrically arranged on the ground, and the placing platform 1 is located between the two walking frames 21. The lower side of the walking frame 21 is provided with moving wheels 22 which are symmetrically rotated front and back through a support, and are in rolling contact with the ground. A leg 23 is fixedly arranged on the upper side of the walking frame 21, and a crossbeam 24 is fixedly arranged between the symmetrical legs 23. A track 25 is fixedly arranged on the lower side of the crossbeam 24, and a moving hoist 26 which moves left and right is slidably arranged on the track 25. A hook 27 which moves up and down is fixedly arranged on the lower side of the moving hoist 26 through a sling.

[0031] See also Figure 1 The adjustment mechanism 3 includes two slings symmetrically installed on the hook 27, and the lower ends of the two slings symmetrically are commonly provided with an adjustment component 31.

[0032] See also Figure 1 The adjustment component 31 includes a track 2 311 fixedly arranged at the lower end of two symmetrical slings, a movable sling 2 312 that moves left and right is symmetrically slidably arranged on the track 2 311, and a connecting piece 313 is fixedly arranged on the lower side of the movable sling 2 312 through three symmetrical slings.

[0033] See also Figure 1 and Figure 3 The lifting mechanism 4 includes a return frame 41 fixedly arranged on the lower side of the corresponding connecting member 313 through four symmetrical slings. The return frame 41 is provided with a lifting component 42 and a lifting component 45. The lifting component 42 is provided with a driving component 43 and a supporting component 44.

[0034] The movable hoist 2 312 drives the corresponding return frame 41 to move left and right along the track 2 311 through the connecting piece 313, so that the distance between the left-right symmetrical return frame 41 and the lifting component 45 can be adjusted, so that the lifting component 45 can lift the steel bars within a certain length range, thereby ensuring the overall flexibility of the lifting operation.

[0035] See also Figure 3 and Figure 5 The lifting assembly 42 includes a fixed platform 421 fixedly arranged on the inner side of the corresponding return frame 41, a hydraulic cylinder 422 with a telescopic end penetrating the fixed platform 421 is fixedly arranged on the upper side of the fixed platform 421, a U-shaped frame 423 with an opening facing downward that moves up and down is fixedly arranged on the telescopic end of the hydraulic cylinder 422, and a guide rod 424 that is slidably connected to the corresponding fixed platform 421 is fixedly arranged on the upper side of the horizontal section of the U-shaped frame 423 symmetrically front and back.

[0036] See also Figure 3 , Figure 5 and Figure 6The driving assembly 43 includes a motor 431 fixedly arranged on the lower side of the horizontal section of the corresponding U-shaped frame 423 through a support 2, and a connecting shaft 432 rotatably connected to the U-shaped frame 423 is fixedly arranged at the driving end of the motor 431, and a plurality of gears 433 are evenly fixedly arranged on the front and rear of the connecting shaft 432.

[0037] See also Figure 3 , Figure 6 and Figure 7 The supporting assembly 44 includes a plurality of docking shafts 441 evenly arranged between the vertical sections symmetrically arranged on the U-shaped frame 423, and the docking shafts 441 correspond to the gears 433 one by one. The front end of the docking shaft 441 surface is evenly fixed with a plurality of splines 442. The front end surface of the docking shaft 441 and the corresponding spline 442 are jointly fixed with a limited baffle 443. The rear end surface of the docking shaft 441 is fixed with a rotating shaft 444. The front and rear adjacent limited baffles 443 and the rotating shaft 444 are fixed by a plate member. The frontmost limit baffle 443 is fixedly connected to the vertical section on the front side of the U-shaped frame 423 through rod one, and the rearmost rotating shaft 444 is fixedly connected to the vertical section on the rear side of the U-shaped frame 423 through rod two. A rotating sleeve 445 is rotatably arranged on the rotating shaft 444, and spline two 446 corresponding to spline one 442 are evenly fixedly arranged on the outer surface of the rotating sleeve 445, and a gear ring 447 which is rotatably connected to the corresponding rotating shaft 444 and meshing with the corresponding gear 433 is fixedly arranged at the rear end of the rotating sleeve 445.

[0038] See also Figure 3 and Figure 7 The lifting assembly 45 includes a winding wheel 451 that is slidably arranged on the docking shaft 441 and moves forward and backward. The winding wheel 451 is provided with a docking groove 452 that is slidably docked with the corresponding spline 442 and spline 2 446. A hook 2 453 is fixedly arranged on the lower side of the winding wheel 451 through a sling 5.

[0039] When it is necessary to reel in the sling 5 and the hook 2 453 that are no longer in use, first slide the winding wheel 1 451 that is no longer in use backwards, so that the winding wheel 1 451 is aligned and plugged with the corresponding spline 2 446 through the docking groove 452. At this time, the winding wheel 1 451 is just completely disengaged from the spline 1 442, and then the motor 1 431 drives the connecting shaft 432 and all the gears 433 to rotate synchronously and directional, and the gear 433 then drives the rotating sleeve 445 and the corresponding spline 2 446 to rotate synchronously through the meshing transmission with the corresponding gear ring 447, and the spline 2 446 then drives the corresponding winding wheel 1 451 to rotate and wind the corresponding sling 5 and the hook 2 453. Hook 2 453, and finally slide the winding wheel 1 451 with the sling five and hook 2 453 forward and align and connect with the corresponding spline 1 442 through the docking groove 452. At this time, the winding wheel 1 451 is completely disengaged from the spline 2 446, so that the winding wheel 1 451 is limited by the spline 1 442 and the limit baffle 443 to prevent the winding wheel 1 451 from rotating. The above-mentioned operation method can not only realize the rapid winding of the hook 2 453, but also avoid the swing of the hook 2 453 that is not needed in the lifting operation, which will affect the normal progress of the lifting operation and the personal safety of the operators during the lifting operation.

[0040] When the wound hook 453 is to be lowered, the winding wheel 451 with the wound hook 453 is first slid backward and docked with the corresponding spline 446, and then the motor 431 drives the gear 433 to rotate in the opposite direction, so that the gear 433 drives the corresponding rotating sleeve 445 and the spline 446 to rotate in the opposite direction through the gear ring 447 to unwind the hook 453, and finally the winding wheel 451 is docked with the spline 442 again to limit the position.

[0041] When the end of the bundle of steel bars on the placement table 1 is to be lifted upward, the hook 2 453 under the unwinding is first hung on the wire rope at the end of the bundle of steel bars, and then the U-shaped frame 423 and all the docking shafts 441 are driven upward by the hydraulic cylinder 422, and the docking shaft 441 then drives the corresponding winding wheel 1 451 and hook 2 453 to move upward synchronously, so that the wire rope is driven upward by hook 2 453 to lift the end of the bundle of steel bars upward. Since the load-bearing capacity of the wire rope is limited, the entire bundle of steel bars cannot be completely lifted for transportation by the cooperation of the wire rope and hook 2 453.

[0042] See also Figure 1 and Figure 3 The pocket mechanism 5 includes a guide rail 51 symmetrically fixedly arranged on the upper side of the return frame 41, an electric slider 52 that moves left and right is slidably arranged on the guide rail 51, and a pocket assembly 53 is commonly arranged on the electric slider 52 that is symmetrically arranged front and back.

[0043] See also Figure 3 , Figure 4 and Figure 5 The pocket assembly 53 includes a winding wheel 532 rotatably arranged on the upper side of the rear electric slider 52 through a U-shaped support with an opening facing upward, a motor 531 with a driving end fixedly connected to the corresponding winding wheel 532 is fixedly arranged on the left side of the U-shaped support, a chain 533 is fixedly arranged on the winding wheel 532, and a fixing plate 534 is fixedly arranged on the opposite sides of the left and right symmetrical electric sliders 52, wherein a hook 3 536 is fixedly arranged on the rear side of the rear fixing plate 534, and a buckle 535 is fixedly arranged on the front side of the front fixing plate 534, and the buckle 535 is fixedly connected to the front end of the chain 533.

[0044] When the two ends of the bundle of steel bars are lifted upward by the left-right symmetrical hooks 453, the corresponding fixed plate 534 is first driven by the electric slider 52 to move to the end of the corresponding guide rail 51 close to the middle of the steel bars, and the front-back symmetrical fixed plate 534 then drives the corresponding entire chain 533 to be covered to the lower side of the bundle of steel bars, and then the motor 2 531 drives the winding wheel 2 532 to wind the chain 533 until the chain 533 tightens the bundle of steel bars without damaging the steel bars, and the chain link of the chain 533 close to the hook 3 536 is hung on the hook 3 536 to pass through the buckle 53 5 and hook three 536 stably bear the corresponding chain 533 and one side of the steel bar, and finally drive the hook two 453 to move downward through the hydraulic cylinder 422 to steadily lower the lifted end of the bundle of steel bars, so that the crane frame 2 can lift and transport the bundle of steel bars through the two symmetrical chains 533. The above-mentioned operation method can not only realize the automatic chain 533 pocketing of multiple bundles of steel bars, but also realize the adaptive tightening of multiple bundles of steel bars, thereby greatly reducing the shaking amplitude of the steel bars during the lifting process, and greatly simplifying the overall manual operation steps during the steel bar lifting process.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gantry crane, comprising a placing platform (1), characterized in that: The placing platform (1) is fixedly arranged on the upper side of the ground, a lifting frame (2) that moves forward and backward is arranged on the ground, an adjusting mechanism (3) is arranged on the lifting frame (2), a lifting mechanism (4) is arranged on the lower side of the adjusting mechanism (3), and a pocket mechanism (5) is arranged on the lifting mechanism (4); The adjustment mechanism (3) comprises two slings symmetrically mounted on the lifting frame (2), and the lower ends of the two slings symmetrically mounted on the lifting frame (2) are provided with an adjustment component (31); The lifting mechanism (4) comprises a return frame (41) which is symmetrically arranged on the lower side of the adjustment component (31) through four slings, a lifting component (42) and a lifting component (45) are arranged on the return frame (41), and a driving component (43) and a supporting component (44) are arranged on the lifting component (42); The pocket mechanism (5) comprises a guide rail (51) symmetrically fixedly arranged on the upper side of the return frame (41), an electric slider (52) slidably arranged on the guide rail (51) and movable left and right, and a pocket assembly (53) is commonly arranged on the electric slider (52) symmetrically arranged front and back.

2. A gantry crane according to claim 1, characterized in that: The crane frame (2) comprises a walking frame (21) symmetrically arranged on the ground, the placing platform (1) is located between the two walking frames (21), the lower side of the walking frame (21) is provided with a moving wheel (22) that is in rolling contact with the ground through a support, a leg (23) is fixedly arranged on the upper side of the walking frame (21), a crossbeam (24) is fixedly arranged between the symmetrical legs (23), a track (25) is fixedly arranged on the lower side of the crossbeam (24), a moving sling (26) that moves left and right is slidably arranged on the track (25), and a hook (27) that moves up and down is fixedly arranged on the lower side of the moving sling (26) through a sling.

3. A gantry crane according to claim 1, characterized in that: The adjustment component (31) comprises a track 2 (311) fixedly arranged at the lower ends of two symmetrical slings, a movable sling 2 (312) symmetrically slidably arranged on the track 2 (311) and movable left and right, and a connecting piece (313) fixedly arranged on the lower side of the movable sling 2 (312) via three symmetrical slings.

4. A gantry crane according to claim 1, characterized in that: The lifting assembly (42) comprises a fixed platform (421) fixedly arranged on the inner side of the corresponding return frame (41); a hydraulic cylinder (422) whose telescopic end passes through the fixed platform (421) is fixedly arranged on the upper side of the fixed platform (421); a U-shaped frame (423) which moves up and down and has an opening facing downward is fixedly arranged on the telescopic end of the hydraulic cylinder (422); and a guide rod (424) which is slidably connected to the corresponding fixed platform (421) is fixedly arranged on the upper side of the horizontal section of the U-shaped frame (423) in a front-to-back symmetrical manner.

5. A gantry crane according to claim 4, characterized in that: The driving assembly (43) comprises a motor 1 (431) fixedly arranged on the lower side of the horizontal section of the corresponding U-shaped frame (423) through a support 2, a connecting shaft (432) rotatably connected to the U-shaped frame (423) being fixedly arranged on the driving end of the motor 1 (431), and a plurality of gears (433) being evenly fixedly arranged on the front and rear of the connecting shaft (432).

6. A gantry crane according to claim 5, characterized in that: The supporting assembly (44) comprises a plurality of docking shafts (441) uniformly arranged front and rear between vertical sections symmetrically arranged front and rear on the U-shaped frame (423), and the docking shafts (441) correspond to the gears (433) one by one, a plurality of splines (442) are uniformly fixedly arranged on the front end of the surface of the docking shaft (441), a limit baffle (443) is fixedly arranged on the front end surface of the docking shaft (441) and the corresponding spline (442), a rotating shaft (444) is fixedly arranged on the rear end surface of the docking shaft (441), and the limit baffles (443) and the rotating shaft (444) adjacent to each other are fixedly arranged by a plate member. The frontmost limit baffle (443) is fixedly connected to the vertical section on the front side of the U-shaped frame (423) through a rod member 1, and the rearmost rotating shaft (444) is fixedly connected to the vertical section on the rear side of the U-shaped frame (423) through a rod member 2. A rotating sleeve (445) is rotatably arranged on the rotating shaft (444), and splines (446) corresponding to the splines (442) are evenly fixedly arranged on the outer surface of the rotating sleeve (445), and a toothed ring (447) is fixedly arranged at the rear end of the rotating sleeve (445) and is rotatably connected to the corresponding rotating shaft (444) and meshed with the corresponding gear (433).

7. A gantry crane according to claim 6, characterized in that: The lifting assembly (45) comprises a winding wheel (451) which is slidably arranged on a docking shaft (441) and can move forward and backward. The winding wheel (451) is provided with a docking groove (452) which is slidably docked with the corresponding spline (442) and the spline (446). A hook (453) is fixedly arranged on the lower side of the winding wheel (451) via a sling (5).

8. A gantry crane according to claim 1, characterized in that: The pocket assembly (53) comprises a winding wheel (532) rotatably arranged on the upper side of the rear electric slider (52) through a U-shaped support with an opening facing upward, a motor (531) having a driving end fixedly connected to the corresponding winding wheel (532) is fixedly arranged on the left side of the U-shaped support, a chain (533) is fixedly arranged on the winding wheel (532), and a fixing plate (534) is fixedly arranged on the opposite side of the left and right symmetrical electric sliders (52), wherein a hook (536) is fixedly arranged on the rear side of the rear fixing plate (534), and a buckle (535) is fixedly arranged on the front side of the front fixing plate (534), and the buckle (535) is fixedly connected to the front end of the chain (533).

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