A gantry crane

Abstract

The present invention discloses a gantry crane, belonging to the field of cranes. A gantry crane includes a frame body and a cross beam fixed on its top, and further includes: a moving plate sliding along the long axis direction of the cross beam, a moving part for driving its sliding is arranged on the moving plate, a winch is arranged on the moving plate, a steel wire rope is wound and connected to the reel of the winch, and a lubricating part for applying lubricating liquid to the outer wall of the steel wire rope is arranged at the bottom of the moving plate; through the friction between the lubricating wheel and the steel wire rope, the lubricant is evenly applied to the steel wire rope, effectively reducing the possibility of friction, wear and fracture between the strands of the steel wire rope, improving the durability of the steel wire rope, and ensuring the safety of lifting; and with the setting of the liquid sealing plate, after the lifting is completed, the supply of the lubricating liquid is cut off, avoiding the waste of the lubricant and reducing the loss of the lubricant.

Description

Technical Field

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

[0002] A gantry crane is a device used for lifting and transporting heavy objects, and is widely used in various ports for loading, unloading and transporting goods. Its main feature is that it can be controlled to move along the corresponding tracks or the wheels assembled at its bottom on the ground through a remote control system, and the lifting components at its ends can be controlled to move, so as to perform a spanning movement within a certain range, thereby covering a large working area for lifting and transporting large heavy objects, improving work efficiency and safety.

[0003] Currently, during the lifting process, the strands of the steel wire rope will be squeezed against each other due to the tensile force generated by the weight of the goods. In this way, it is easy for the strands of the steel wire rope to be worn or even broken, reducing the durability of the steel wire rope and the safety of lifting; while for a gantry crane with wheels, it is easy to slip during the lifting process, reducing the stability and safety of lifting. Although the wheels are usually equipped with a self-locking structure, it needs to be manually opened and closed, thus reducing the lifting efficiency. Therefore, a gantry crane is proposed. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art that the strands of the steel wire rope are prone to wear or even break; and that a gantry crane with wheels is prone to slip during the lifting process, resulting in insufficient stability, and to propose a gantry crane.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A gantry crane includes a frame body and a cross beam fixed on its top, and further includes: a moving plate that slides along the long axis direction of the cross beam, a moving part is provided on the moving plate to drive its sliding, a winch is provided on the moving plate, a steel wire rope is wound and connected to the reel of the winch, the bottom end of the steel wire rope penetrates through the moving plate and extends below the cross beam and is fixedly connected to a hook, and a lubricating part for applying lubricating liquid to the outer wall of the steel wire rope is provided at the bottom of the moving plate; a moving seat fixed at the bottom of the frame body, moving wheels are rotatably connected to the bottoms of both ends of the moving seat, and a positioning part for locking the moving wheels is provided on the moving seat.

[0007] For the convenience of the sliding of the moving plate, preferably, the moving part includes two groups of driving wheels. Limiting sliding grooves are opened on both sides of the cross beam. The two groups of driving wheels are respectively clamped in the limiting sliding grooves on both sides, and the end part of the rotating shaft of the driving wheel is rotatably connected to the moving plate. A driving motor is fixedly connected to the side wall of the moving plate, and the output shaft of the driving motor is in transmission connection with the rotating shaft of the driving wheel on the same side through a gear set.

[0008] To improve the durability of the steel wire rope, preferably, the lubricating part includes a lubricating disc. The lubricating disc is fixed at the bottom of the moving plate. Lubricating wheels are rotatably connected to both sides of the inner cavity of the lubricating disc. The steel wire rope passes through the centers of the lubricating wheels on both sides and is in contact with their side walls. Lubricating boxes are fixedly connected to both sides of the top of the moving plate. The lubricating boxes are communicated with the lubricating disc through liquid guide pipes. Liquid guide discs are fixedly connected to both sides of the inner wall of the lubricating disc. The liquid guide pipes are located directly above the liquid guide discs, and the output ends of the liquid guide discs are located above the lubricating wheels.

[0009] To improve the smoothness of the sliding of the moving plate, preferably, auxiliary sliding grooves are opened inside both sides of the top of the moving plate. Auxiliary sliding pulleys are rotatably connected in the auxiliary sliding grooves. The auxiliary sliding pulleys are in sliding contact with the top of the cross beam.

[0010] To improve the utilization effect of the lubricating liquid, preferably, a liquid pumping box is fixedly connected to the bottom of the moving plate. The rotating shaft of the auxiliary sliding pulley penetrates into the liquid pumping box and is fixedly connected with a liquid pumping blade. A liquid pumping pipe is fixedly connected and communicated with the side wall of the liquid pumping box. The other end of the liquid pumping pipe is communicated with the bottom of the inner cavity of the lubricating disc. Lubricating guide grooves are opened on both sides of the cross beam. The bottom of the liquid pumping box is located in the lubricating guide grooves and moves along the long axis direction thereof. The lubricating guide grooves are communicated with the inner cavity of the limiting sliding grooves. Drainage holes are opened at the bottom of the liquid pumping box.

[0011] To avoid the dripping of the lubricating liquid, further, a drip prevention ring is fixedly connected to the bottom of the lubricating disc. Absorbent cotton is fixedly connected to the inner wall of the drip prevention ring, and the steel wire rope passes through the center of the inner cavity of the drip prevention ring.

[0012] To improve the stability during hoisting, preferably, the positioning part includes locking tooth blocks. A locking groove is opened in the middle of the moving wheel. A locking tooth disc is fixedly connected to the rotating shaft of the moving wheel located in the locking groove. Locking boxes are fixedly connected to both sides of the moving seat. A locking slider is slidably connected in the locking box. A first spring is fixedly connected between the top of the locking slider and the locking box. The locking tooth block is fixed to the bottom of the locking slider, and the locking tooth block is located directly above the locking tooth disc. An air inflation part for pushing the locking slider to move downward is arranged on the moving plate.

[0013] Furthermore, the inflation part includes a piston chamber fixed to the top of the moving plate. A piston plate is slidably connected inside the piston chamber. Second springs are fixedly connected between both sides of the bottom of the piston plate and the piston chamber. The winch is fixed to the top of the piston plate. Air ducts are respectively fixed and communicated with both sides of the piston chamber, and the output ends of the air ducts are communicated with the top cavity of the locking box.

[0014] To reduce lubricant loss, preferably, sealing liquid plates are fixedly connected to both sides of the bottom of the piston plate. The sealing liquid plates penetrate downward into the lubricating disc. The side walls of the sealing liquid plates are in contact with the output ports of the liquid guide pipes, and liquid outlet holes are formed in the sealing liquid plates.

[0015] To reduce wire rope wear, preferably, a wire rope guide pipe is fixedly connected to the center of the bottom of the piston plate. The inner cavity of the top end of the wire rope guide pipe penetrates upward to the winding disc of the winch. The bottom end of the wire rope guide pipe penetrates into the lubricating disc. The wire rope passes through the wire rope guide pipe, and the inner diameter of the wire rope guide pipe is larger than the outer diameter of the wire rope.

[0016] Compared with the prior art, the present invention provides a gantry crane, which has the following beneficial effects:

[0017] 1. In this gantry crane, through the frictional action between the lubricating wheel and the wire rope, the lubricant is evenly applied to the wire rope, effectively reducing the possibility of friction, wear and breakage between the strands of the wire rope, improving the durability of the wire rope, and ensuring the safety of lifting. With the setting of the sealing liquid plate, after the lifting is completed, the supply of the lubricating liquid is cut off, avoiding waste of the lubricant and reducing the loss of the lubricant.

[0018] 2. In this gantry crane, through the setting of the auxiliary pulley, the liquid extraction blade and the liquid extraction pipe, the lubricant dripping into the lubricating disc is conveyed to the limiting chute to lubricate the outer wall of the driving wheel, reducing the frictional loss between it and the limiting chute. At the same time, the recycled lubricant after dripping is realized, effectively reducing the loss of the lubricant and improving the utilization effect of the lubricant.

[0019] 3. In this gantry crane, through the gravitational action of the lifted goods, with the setting of the piston plate, the air duct, the locking slider, the locking tooth block and the locking tooth disc, the plug-in locking of the moving wheel is realized, improving the stability and safety during the lifting process. And without manual intervention, the locking and unlocking can be automatically carried out during the process of hoisting goods, effectively improving the hoisting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the main view overall structure schematic diagram of a gantry crane proposed by the present invention;

[0021] Figure 2Schematic diagram of the front view of the half-section of the crossbeam of a gantry crane proposed by the present invention;

[0022] Figure 3 Schematic diagram of the bottom view of the half-section of the crossbeam of a gantry crane proposed by the present invention;

[0023] Figure 4 Schematic diagram of the partial sectional structure of the moving seat of a gantry crane proposed by the present invention;

[0024] Figure 5 For a gantry crane proposed by the present invention Figure 4 Enlarged structure diagram of area A;

[0025] Figure 6 Schematic diagram of the half-section structure of the piston chamber of a gantry crane proposed by the present invention;

[0026] Figure 7 For a gantry crane proposed by the present invention Figure 6 Enlarged structure diagram of area B;

[0027] Figure 8 Schematic diagram of the half-section structure of the lubricating disc of a gantry crane proposed by the present invention;

[0028] Figure 9 For a gantry crane proposed by the present invention Figure 8 Enlarged structure diagram of area C.

[0029] In the figure: 1, frame body; 2, crossbeam; 21, limit sliding groove; 22, lubricating guide groove; 3, moving plate; 31, winch; 32, steel wire rope; 33, hook; 34, liquid extraction box; 341, liquid extraction blade; 342, liquid extraction pipe; 343, liquid discharge hole; 4, moving seat; 41, moving wheel; 5, driving wheel; 51, driving motor; 52, gear set; 53, auxiliary moving groove; 531, auxiliary moving pulley; 6, lubricating disc; 61, lubricating wheel; 62, lubricating box; 63, liquid guide pipe; 64, liquid guide disc; 65, anti-drip ring; 651, liquid absorption cotton; 7, locking tooth block; 71, locking groove; 711, locking tooth disc; 72, locking box; 721, locking slider; 722, first spring; 73, piston chamber; 731, piston plate; 732, second spring; 733, air guide pipe; 8, liquid sealing plate; 81, liquid outlet hole; 9, wire guiding pipe. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. Embodiment

[0032] Refer to Figures 1 - 9 , a gantry crane, comprising a frame body 1 and a cross beam 2 fixed to the top thereof, further comprising: a moving plate 3 sliding along the long axis direction of the cross beam 2, a moving part for driving the sliding thereof is arranged on the moving plate 3, a hoist 31 is arranged on the moving plate 3, a steel wire rope 32 is wound and connected to the reel of the hoist 31, the bottom end of the steel wire rope 32 penetrates through the moving plate 3 and extends below the cross beam 2 and is fixedly connected with a hook 33, and a lubricating part for applying lubricating liquid to the outer wall of the steel wire rope 32 is arranged at the bottom of the moving plate 3; a moving seat 4 fixed to the bottom of the frame body 1, moving wheels 41 are rotatably connected to the bottoms of both ends of the moving seat 4, and a positioning part for locking the moving wheels 41 is arranged on the moving seat 4.

[0033] Refer to Figure 1 , Figure 4 and Figure 5 , wherein, the positioning part includes a locking tooth block 7, a locking groove 71 is formed in the middle of the moving wheel 41, a locking tooth disc 711 is fixedly connected to the rotating shaft of the moving wheel 41 located in the locking groove 71, locking boxes 72 are fixedly connected to both sides of the moving seat 4, a locking slider 721 is slidably connected in the locking box 72, a first spring 722 is fixedly connected between the top of the locking slider 721 and the locking box 72, the locking tooth block 7 is fixed to the bottom of the locking slider 721, and the locking tooth block 7 is located directly above the locking tooth disc 711, and an inflating part for pushing the locking slider 721 to move down is arranged on the moving plate 3; the inflating part includes a piston chamber 73, the piston chamber 73 is fixed to the top of the moving plate 3, a piston plate 731 is slidably connected in the piston chamber 73, second springs 732 are fixedly connected between both sides of the bottom of the piston plate 731 and the piston chamber 73, the hoist 31 is fixed to the top of the piston plate 731, air guide pipes 733 are respectively fixedly connected and communicated with both sides of the piston chamber 73, and the output end of the air guide pipe 733 is communicated with the top of the inner cavity of the locking box 72.

[0034] By setting the above structure, the winch 31 is turned on, so that the wire rope 32 is wound around its reel, so that the cargo is lifted. When the cargo is gradually lifted, under the action of gravity, the piston plate 731 will be pulled downward, so as to compress the gas in the piston chamber 73 and allow the gas to enter the locking box 72 along the air guide pipe 733, so as to push the locking slider 721 downward, so that the locking tooth block 7 is plugged into the locking tooth disk 711, and a meshing locking effect is formed, so that the moving wheel 41 will not move again during the lifting process, thereby improving the stability and safety of the lifting process; and without manual intervention, the locking and unlocking can be performed automatically during the lifting of the cargo, which effectively improves the lifting efficiency; and when the cargo is not lifted, the position of the device can be changed by the moving wheel 41, thereby improving the convenience of use.

[0035] Reference Figure 2 , Figure 3 The moving part includes two sets of driving wheels 5, and limiting sliding grooves 21 are provided on both sides of the crossbeam 2. The two sets of driving wheels 5 are respectively clamped in the limiting sliding grooves 21 on both sides, and the ends of the rotating shafts of the driving wheels 5 are rotatably connected to the moving plate 3. A driving motor 51 is fixedly connected to the side wall of the moving plate 3, and the output shaft of the driving motor 51 is connected to the rotating shaft of the driving wheel 5 on the same side through a gear set 52.

[0036] Through the arrangement of the above structure, when the cargo is lifted, the driving motor 51 is turned on to drive the driving wheel 5 to rotate. Under the action of the gravity and friction of the cargo, the movable plate 3 will move along the beam 2 to the loading area, so as to move the lifted cargo, thereby improving the convenience of lifting and loading.

[0037] Reference Figure 6 , Figure 8 and Figure 9 , wherein the lubrication part includes a lubrication disk 6, which is fixed at the bottom of the movable plate 3, and both sides of the inner cavity of the lubrication disk 6 are rotatably connected with lubrication wheels 61, and the wire rope 32 passes through the center of the lubrication wheels 61 on both sides and fits with its side walls, and both sides of the top of the movable plate 3 are fixedly connected with lubrication boxes 62, and the lubrication box 62 is connected to the lubrication disk 6 through a liquid guide tube 63, and both sides of the inner wall of the lubrication disk 6 are fixedly connected with liquid guide disks 64, and the liquid guide tube 63 is located directly above the liquid guide disk 64, and the output end of the liquid guide disk 64 is located above the lubrication wheel 61; both sides of the bottom of the piston plate 731 are fixedly connected with liquid sealing plates 8, and the liquid sealing plates 8 penetrate downward into the lubrication disk 6, and the side walls of the liquid sealing plates 8 fit with the output port of the liquid guide tube 63, and the liquid sealing plates 8 are provided with liquid outlet holes 81.

[0038] With the above structure, when the piston plate 731 moves downward, it will push the liquid sealing plate 8 downward, so that the liquid outlet hole 81 communicates with the output port of the liquid guide pipe 63. At this time, the lubricating liquid will drip along the liquid guide pipe 63 into the liquid guide tray 64, and then slide down along the liquid guide tray 64 to the lubricating wheel 61. Under the action of friction, when the steel wire rope 32 is wound upward, it will pull the lubricating wheel 61 to rotate, so that the lubricant adhered to the surface of the lubricating wheel 61 is evenly applied to the steel wire rope 32, effectively reducing the possibility of friction, wear and breakage between the strands of the steel wire rope 32, improving the durability of the steel wire rope 32, and ensuring the safety of lifting; when the lifting of the goods is completed, due to the gravitational effect on the steel wire rope 32, at this time, under the rebounding action of the second spring 732, the piston plate 731 will reset, causing the liquid sealing plate 8 to move upward and block the output port of the liquid guide pipe 63, thereby cutting off the supply of the lubricating liquid, avoiding waste of the lubricant, and reducing the loss of the lubricant.

[0039] In addition, during the process of the lubricating wheel 61 applying lubricant to the steel wire rope 32, a part of the lubricating liquid will drip into the lubricating tray 6 and slide along the arc-shaped wall of the lubricating tray 6 to its bottom for collection, so as to recycle the dripping lubricant subsequently, improving the utilization effect of the lubricant.

[0040] Refer to Figure 8 、 Figure 9 , wherein, a drip-proof ring 65 is fixedly connected to the bottom of the lubricating tray 6, a liquid-absorbing cotton 651 is fixedly connected to the inner wall of the drip-proof ring 65, and the steel wire rope 32 passes through the center of the inner cavity of the drip-proof ring 65; the lubricating liquid applied to the steel wire rope 32 will slide downward along the steel wire rope 32 due to gravity. At this time, with the arrangement of the liquid-absorbing cotton 651, the dripping lubricant can be collected, which can not only lubricate the steel wire rope 32 passing through the liquid-absorbing cotton 651 subsequently, improving the utilization effect of the lubricating liquid, but also prevent the lubricating liquid from overflowing onto the goods, improving the protection effect.

[0041] Refer to Figures 6 - 8 , wherein, auxiliary moving chutes 53 are respectively opened in the inner parts of both sides of the top of the moving plate 3, auxiliary moving pulleys 531 are rotatably connected in the auxiliary moving chutes 53, and the auxiliary moving pulleys 531 are in sliding contact with the top of the cross beam 2; a liquid pumping box 34 is fixedly connected to the bottom of the moving plate 3, the rotating shaft of the auxiliary moving pulley 531 penetrates into the liquid pumping box 34 and is fixedly connected with a liquid pumping blade 341, a liquid pumping pipe 342 is fixedly connected and communicated with the side wall of the liquid pumping box 34, and the other end of the liquid pumping pipe 342 is communicated with the bottom of the inner cavity of the lubricating tray 6; lubricating guide grooves 22 are respectively opened on both sides of the cross beam 2, the bottom of the liquid pumping box 34 is located in the lubricating guide grooves 22 and moves along the long axis direction thereof, the lubricating guide grooves 22 are communicated with the inner cavity of the limiting chute 21, and a liquid discharging hole 343 is opened at the bottom of the liquid pumping box 34.

[0042] With the above structure set, when the moving plate 3 moves, the auxiliary pulley 531 will rotate while adhering to the top of the cross beam 2, thereby driving the liquid extraction blades 341 in the liquid extraction box 34 to rotate, so as to generate a suction force on one side of the liquid extraction box 34 close to the liquid extraction pipe 342, enabling the lubricating liquid dripping onto the bottom of the lubricating disc 6 to enter the liquid extraction box 34 along the liquid extraction pipe 342, and then dripping into the lubricating guide groove 22 through the liquid discharge hole 343, and finally sliding into the limit sliding groove 21, thereby lubricating the outer wall of the driving wheel 5, reducing the frictional loss generated between it and the limit sliding groove 21, and at the same time realizing the reuse of the lubricant after dripping, effectively reducing the loss of the lubricant and improving the utilization effect of the lubricant.

[0043] Refer to Figure 6 , Figure 8 and Figure 9 , wherein, a guide rope tube 9 is fixedly connected to the center of the bottom of the piston plate 731. The inner cavity at the top of the guide rope tube 9 penetrates upward to the winding disc of the winch 31, and the bottom end of the guide rope tube 9 penetrates into the lubricating disc 6. The steel wire rope 32 passes through the guide rope tube 9, and the inner diameter of the guide rope tube 9 is larger than the outer diameter of the steel wire rope 32. In this way, the wear generated when the steel wire rope 32 passes through each component can be effectively reduced, the service life of the steel wire rope 32 is improved, and the safety of hoisting is ensured.

[0044] Refer to Figures 1 - 9 , in the present invention, when in use, the hook 33 is hooked on the goods to be hoisted, and at the same time the winch 31 is started, so that the steel wire rope 32 winds around its reel, thereby hoisting the goods. When the goods are gradually hoisted, under the action of gravity, the piston plate 731 will be pulled downward, thereby compressing the gas in the piston chamber 73 and causing the gas to enter the locking box 72 along the air guide pipe 733, thereby pushing the locking slider 721 downward, so that the locking tooth block 7 is inserted into the locking tooth disc 711 and forms a meshing and locking effect, so that the moving wheel 41 will not move again during hoisting, improving the stability of hoisting. At the same time when the piston plate 731 moves downward, it will push the liquid sealing plate 8 downward, so that the liquid outlet hole 81 is communicated with the output port of the liquid guide pipe 63. At this time, the lubricating liquid will drip into the liquid guide disc 64 along the liquid guide pipe 63, and then slide down the liquid guide disc 64 to the lubricating wheel 61. Under the action of friction, when the steel wire rope 32 is wound upward, it will pull the lubricating wheel 61 to rotate, so that the lubricant adhered to the surface of the lubricating wheel 61 is evenly smeared on the steel wire rope 32, effectively reducing the possibility of friction, wear and fracture between the strands of the steel wire rope 32, improving the durability of the steel wire rope 32, and ensuring the safety of hoisting.

[0045] After the goods are lifted, the driving motor 51 is started to drive the driving wheel 5 to rotate. Under the action of the gravity and friction of the goods, the moving plate 3 will move along the cross beam 2 to the loading area. When the moving plate 3 moves, the auxiliary pulley 531 will rotate on the top of the cross beam 2, thereby driving the liquid extraction blade 341 in the liquid extraction box 34 to rotate, so as to generate a suction force on the side of the liquid extraction box 34 close to the liquid extraction pipe 342, making the lubricating liquid dripping onto the bottom of the lubricating disc 6 enter the liquid extraction box 34 along the liquid extraction pipe 342, and then drip into the lubricating guide groove 22 through the liquid discharge hole 343, and finally slide into the limit chute 21, so as to lubricate the outer wall of the driving wheel 5, reduce the friction loss generated between it and the limit chute 21, and at the same time realize the reuse of the dripped lubricant, effectively reducing the loss of the lubricant and improving the energy-saving effect.

[0046] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered within the protection scope of the present invention.

Claims

1. A gantry crane, comprising a frame (1) and a crossbeam (2) fixed on the top thereof, characterized in that: Also includes: A movable plate (3) slides along the longitudinal direction of the cross beam (2), the movable plate (3) being provided with a movable portion for driving the movable plate to slide, the movable plate (3) being provided with a hoist (31), a steel wire rope (32) being wound and connected to a reel of the hoist (31), the bottom end of the steel wire rope (32) passing through the movable plate (3) extending to below the cross beam (2) and being fixedly connected to a hook (33), and a lubricating portion for applying lubricating liquid to the outer wall of the steel wire rope (32) being provided at the bottom of the movable plate (3); A moving seat (4) fixed to the bottom of the frame (1), wherein the bottoms of both ends of the moving seat (4) are rotatably connected to moving wheels (41), and a positioning portion for locking the moving wheels (41) is provided on the moving seat (4); The moving part comprises two groups of driving wheels (5), both sides of the cross beam (2) are provided with limiting sliding grooves (21), the two groups of driving wheels (5) are respectively clamped in the limiting sliding grooves (21) on both sides, and the ends of the rotating shafts of the driving wheels (5) are rotatably connected to the moving plate (3), the side wall of the moving plate (3) is fixedly connected with a driving motor (51), and the output shaft of the driving motor (51) is connected to the rotating shaft of the driving wheel (5) on the same side through a gear set (52); The lubrication part comprises a lubrication plate (6), the lubrication plate (6) being fixed at the bottom of the movable plate (3), the inner cavity of the lubrication plate (6) being rotatably connected to lubrication wheels (61) on both sides, the steel wire rope (32) passing through the center of the lubrication wheels (61) on both sides and fitting against the side walls thereof, the top of the movable plate (3) being fixedly connected to lubrication boxes (62) on both sides, the lubrication boxes (62) being connected to the lubrication plate (6) via a liquid guide tube (63), the inner wall of the lubrication plate (6) being fixedly connected to liquid guide plates (64), the liquid guide tube (63) being located directly above the liquid guide plate (64), and the output end of the liquid guide plate (64) being located above the lubrication wheel (61); Auxiliary sliding grooves (53) are provided inside both sides of the top of the movable plate (3), and an auxiliary pulley (531) is rotatably connected inside the auxiliary sliding groove (53), and the auxiliary pulley (531) is slidably fitted with the top of the crossbeam (2); The bottom of the movable plate (3) is fixedly connected to a liquid extraction box (34); the rotating shaft of the auxiliary pulley (531) passes through the liquid extraction box (34) and is fixedly connected to a liquid extraction blade (341); the side wall of the liquid extraction box (34) is fixed and connected to a liquid extraction tube (342); the other end of the liquid extraction tube (342) is connected to the bottom of the inner cavity of the lubricating plate (6); lubrication guide grooves (22) are provided on both sides of the crossbeam (2); the bottom of the liquid extraction box (34) is located in the lubrication guide groove (22) and moves along the long axis direction thereof; the lubrication guide groove (22) is connected to the inner cavity of the limiting slide groove (21); and a drainage hole (343) is provided at the bottom of the liquid extraction box (34).

2. A gantry crane according to claim 1, characterized in that: The bottom of the lubrication plate (6) is fixedly connected to an anti-drip ring (65), the inner wall of the anti-drip ring (65) is fixedly connected to a liquid-absorbing cotton (651), and the steel wire rope (32) passes through the center of the inner cavity of the anti-drip ring (65).

3. A gantry crane according to claim 1, characterized in that: The positioning portion comprises a locking tooth block (7); a locking groove (71) is provided in the middle of the moving wheel (41); a locking tooth disk (711) is fixedly connected to the rotating shaft of the moving wheel (41) located in the locking groove (71); locking boxes (72) are fixedly connected to both sides of the moving seat (4); a locking slider (721) is slidably connected in the locking box (72); a first spring (722) is fixedly connected between the top of the locking slider (721) and the locking box (72); the locking tooth block (7) is fixed to the bottom of the locking slider (721), and the locking tooth block (7) is located directly above the locking tooth disk (711); and an inflatable portion for pushing the locking slider (721) to move downward is provided on the moving plate (3).

4. A gantry crane according to claim 3, characterized in that: The inflation portion comprises a piston bin (73), the piston bin (73) being fixed on the top of the movable plate (3), a piston plate (731) being slidably connected in the piston bin (73), second springs (732) being fixedly connected between the two sides of the bottom of the piston plate (731) and the piston bin (73), the winch (31) being fixed on the top of the piston plate (731), air guide pipes (733) being fixed and connected on the two sides of the piston bin (73), and an output end of the air guide pipe (733) being connected to the top of the inner cavity of the locking box (72).

5. A gantry crane according to claim 4, characterized in that: Both sides of the bottom of the piston plate (731) are fixedly connected to a liquid sealing plate (8), the liquid sealing plate (8) penetrates downward into the lubrication disk (6), the side wall of the liquid sealing plate (8) fits with the output port of the liquid guide tube (63), and a liquid outlet hole (81) is provided on the liquid sealing plate (8).

6. A gantry crane according to claim 4, characterized in that: A rope guide tube (9) is fixedly connected to the center of the bottom of the piston plate (731); the inner cavity at the top end of the rope guide tube (9) extends upward to the winding disk of the winch (31); the bottom end of the rope guide tube (9) extends into the lubrication disk (6); the steel wire rope (32) passes through the rope guide tube (9); and the inner diameter of the rope guide tube (9) is greater than the outer diameter of the steel wire rope (32).

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