Portal crane with accurate positioning structure

Abstract

The application discloses a gantry crane with accurate positioning structure and relates to the technical field of gantry cranes, which comprises supporting legs, vertical supporting structures, two beams symmetrically arranged in front and back, the two beams being movably arranged on the two supporting legs, a plurality of groups of grooves being horizontally arranged on the beams, a lifting trolley being horizontally movably arranged on the beams, two groups of lifting devices being symmetrically arranged on the lifting trolley, a plurality of groups of stabilizing devices being annularly arranged on the lifting trolley, two groups of positioning and buffering devices being symmetrically arranged in front and back, each group of the positioning and buffering devices being symmetrically arranged on the lifting trolley, the positioning and buffering devices being fixed to the bottom of the lifting trolley and corresponding to the grooves on the beams, and a lifting tool connecting platform being fixed to the bottom of the lifting device and fixedly connected to the bottom of the stabilizing device. The application realizes accurate positioning and stable control of the lifting tool connecting platform during movement and lifting, and finally realizes high-precision lifting and placing of the lifting tool and the goods.

Description

Technical Field

[0001] This invention relates to the field of gantry crane technology, and more specifically, to a gantry crane with a precise positioning structure. Background Technology

[0002] Traditional gantry cranes often suffer from insufficient positioning accuracy of the spreader and poor stability during lifting and movement, leading to difficulties in accurately aligning the cargo at the connection point. This not only affects operational efficiency but can also cause safety hazards due to swaying and misalignment. Particularly during cargo handling, technical bottlenecks exist in the lateral movement control of the crane trolley, the lifting stability of the spreader, and the precise positioning of the connection between the spreader and the cargo, making it difficult to meet the requirements of high-precision lifting operations. Therefore, it is necessary to provide a gantry crane with an accurate positioning structure to solve the problems mentioned in the background. Summary of the Invention

[0003] To achieve the above objectives, the present invention provides the following technical solution: a gantry crane with an accurate positioning structure, comprising:

[0004] Support legs, vertical support structure;

[0005] Two crossbeams are symmetrically distributed front and back, and are movable on the two side legs. The crossbeams are provided with multiple sets of grooves distributed laterally.

[0006] The lifting trolley is mounted on a crossbeam for lateral movement.

[0007] The lifting device has two sets symmetrically distributed on the left and right sides and fixed on the lifting trolley;

[0008] The stabilizing device is arranged in multiple sets in a ring and fixed on the lifting trolley, located between the lifting devices at both ends.

[0009] The positioning buffer device is provided in two sets symmetrically distributed at the front and rear, and two sets are provided symmetrically distributed on the left and right sides of each set. It is fixed to the bottom of the lifting trolley and corresponds to the groove on the crossbeam.

[0010] The lifting platform is fixed to the bottom of the lifting device and is also fixedly connected to the bottom of the stabilizing device.

[0011] Furthermore, as a preferred embodiment, the lifting trolley consists of a moving platform, wheels, and an electric motor. The moving platform is mounted on the crossbeam by means of the wheels, which are driven by the electric motor. A positioning buffer device corresponding to the crossbeam is fixedly connected to the bottom of the moving platform between the wheels on the same side.

[0012] Furthermore, preferably, the lifting device includes:

[0013] The drive assembly is fixed to the crane trolley;

[0014] The drum is fixed on the drive assembly and is driven to rotate by the drive assembly;

[0015] Fixed pulley blocks are fixed to the bottom of the lifting trolley;

[0016] The movable pulley system is set up in correspondence with the fixed pulley system;

[0017] A connecting groove is provided at the bottom of the movable pulley block, and the movable pulley block is rotatably disposed in the connecting groove. The connecting groove is fixedly connected to the lifting device connecting platform.

[0018] The steel wire rope is wound around the drum at both ends and passes through the movable pulley block and the fixed pulley block in the middle.

[0019] Furthermore, preferably, the stabilizing device includes:

[0020] The mounting bracket assembly is fixed to the top of the lifting trolley;

[0021] The stabilizing component is retracted and moved onto the fixed frame component, with its bottom passing through the lifting trolley and fixedly connected to the lifting platform.

[0022] Furthermore, preferably, the fixing frame assembly includes:

[0023] Four fixed columns, arranged in a square shape, are fixed to the top of the lifting trolley;

[0024] Two slide rails are symmetrically distributed and fixed on the same side fixed column. One end of the slide rail is fixedly connected by a connecting column. The inner side of the slide rail is provided with a compression spring connected to the extension and retraction stabilization component.

[0025] The limiting roller is rotatably mounted at the end of the slide rail away from the connecting column and located outside the fixed column;

[0026] The guide roller is rotatably mounted on the lower part of the fixed column at the end away from the connecting column.

[0027] Furthermore, preferably, the retraction and extension stabilization component includes:

[0028] A movable shaft is movably disposed within a slide rail and rotatably connected to the end of a compression spring. The movable shaft is connected to a drive mechanism, which is movably disposed at the top of the slide rail.

[0029] The drive roller is fixed in the middle of the moving shaft;

[0030] A single-sided chain plate, one end of which is wound around the drive roller, and the other end passes between the limit roller and the guide roller, passing through the lifting trolley and being fixedly connected to the lifting device connection platform.

[0031] Furthermore, preferably, the positioning buffer device includes:

[0032] The hydraulic positioning assembly is fixed to the bottom of the mobile platform;

[0033] The locking component is fixed to the end of the hydraulic positioning component away from the middle of the crane trolley.

[0034] Furthermore, preferably, the hydraulic positioning assembly includes:

[0035] The hydraulic cylinder is fixed to the bottom of the mobile platform, and a movable hydraulic shaft is installed inside the end away from the center of the mobile platform.

[0036] The positioning plate is fixed on the hydraulic shaft;

[0037] The connecting plate is fixed to the end of the hydraulic shaft on one side and fixedly connected to the locking assembly on the other side.

[0038] Furthermore, preferably, the locking component includes:

[0039] The connecting frame is fixed to the side wall of the connecting plate;

[0040] The rotating blocks are arranged in multiple groups horizontally, with multiple blocks arranged vertically in each group, and are rotatably mounted on the connecting frame.

[0041] Compared with the prior art, the beneficial effects of the present invention are:

[0042] In this invention, the coordinated arrangement of the hydraulic positioning component and the locking component in the positioning buffer device enables precise stopping control of the lifting trolley on the crossbeam, ensuring accurate alignment between the spreader and the cargo.

[0043] By cooperating with the fixed frame assembly and the retraction stabilization assembly in the stabilization device, a polygonal stabilization structure is formed by multiple sets of ring-shaped single-sided chain plates, which maintains the horizontal state of the spreader connection platform during movement and lifting, effectively suppressing swaying and deflection, and enabling accurate positioning between the spreader and the cargo.

[0044] By using a multi-point winding connection between the fixed pulley block and the movable pulley block in the lifting device, the load is distributed to multiple contact points, avoiding stress concentration at a single point, extending the equipment life, and improving the anti-sway performance of the lifting platform.

[0045] By matching the positioning buffer device with the groove of the crossbeam, and combining it with the movement control logic of the crane trolley, the spreader can be accurately positioned and stably stopped during lateral movement. This ultimately achieves precise positioning, lifting, and placement of the spreader at the connection point with the cargo, meeting the requirements of high-precision lifting operations. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the overall structure of a gantry crane with a precise positioning structure.

[0047] Figure 2 A schematic diagram of the lifting trolley and lifting device;

[0048] Figure 3 This is a top view of the crane trolley;

[0049] Figure 4 This is a schematic diagram of the stabilizing device structure;

[0050] Figure 5 This is a schematic diagram of the structure of the fixed frame assembly and the retraction and extension stabilization assembly;

[0051] Figure 6 This is a schematic diagram of the positioning buffer device.

[0052] Figure 7 A schematic diagram of the hydraulic positioning and locking components;

[0053] Figure 8 A diagram illustrating the operation of the locked component;

[0054] In the diagram: 1. Outrigger; 2. Crossbeam; 3. Lifting trolley; 4. Lifting device; 5. Stabilizing device; 6. Positioning and buffering device; 7. Lifting device connecting platform; 31. Moving platform; 32. Wheel; 33. Motor; 41. Drive assembly; 42. Drum; 43. Fixed pulley block; 44. Moving pulley block; 45. Connecting groove; 46. Wire rope; 51. Fixed frame assembly; 52. Retraction and stabilization assembly; 61. Hydraulic positioning assembly; 62. Locking assembly; 511. Fixed column; 512. Slide rail; 513. Limiting roller; 514. Guide roller; 521. Moving shaft; 522. Drive roller; 523. Single-sided chain plate; 611. Hydraulic cylinder; 612. Hydraulic shaft; 613. Positioning plate; 614. Connecting plate; 621. Connecting frame; 622. Rotating block. Detailed Implementation

[0055] Please see Figures 1 to 8 In this embodiment of the invention, a gantry crane with an accurate positioning structure includes:

[0056] Outer leg 1, vertical support structure;

[0057] Two crossbeams 2 are symmetrically distributed front and back, and are movable on the two side legs 1. The crossbeams 2 are provided with multiple sets of grooves distributed laterally.

[0058] The lifting trolley 3 is laterally mounted on the crossbeam 2;

[0059] The lifting device 4 has two sets symmetrically distributed on the left and right sides and fixed on the lifting trolley 3;

[0060] Stabilizing device 5, multiple sets are arranged in a ring, fixed on the lifting trolley 3, located between the lifting devices 4 at both ends;

[0061] The positioning buffer device 6 is provided in two sets symmetrically distributed front and back, and two sets are provided symmetrically distributed left and right in each set. It is fixed at the bottom of the lifting trolley 3 and corresponds to the groove on the crossbeam 2.

[0062] The lifting platform 7 is fixed to the bottom of the lifting device 4 and is fixedly connected to the bottom of the stabilizing device 5.

[0063] In this embodiment, the lifting trolley 3 consists of a mobile platform 31, wheels 32 and a motor 33. The mobile platform 31 is movably mounted on the crossbeam 2 via the wheels 32. The wheels 32 are driven by the motor 33, and a positioning buffer device 6 corresponding to the crossbeam 2 is fixedly connected to the bottom of the mobile platform 31 between the wheels 32 on the same side.

[0064] In other words, the lifting trolley 3 moves laterally on the crossbeam 2 via wheels 32, and the lifting device 4 and stabilizing device 5 drive the spreader connection platform 7 to move and descend smoothly, facilitating accurate positioning and connection between the spreader at the bottom of the spreader connection platform 7 and the cargo. Furthermore, under the action of the positioning buffer device 6 between the moving platform 31 and the crossbeam 2, the lifting trolley 3 stops precisely during its movement, ensuring stable movement of the spreader while stopping precisely, so that the spreader and the cargo connection are accurately aligned, facilitating precise positioning and lifting of the cargo. In addition, the bottom of the spreader connection platform 7 can be connected to spreaders such as grab buckets, electromagnetic chucks, and hooks.

[0065] In this embodiment, the lifting device 4 includes:

[0066] Drive component 41 is fixed on the crane trolley 3;

[0067] The drum 42 is fixed on the drive assembly 41 and is driven to rotate by the drive assembly 41.

[0068] Fixed pulley block 43 is fixed to the bottom of the lifting trolley 3;

[0069] The movable pulley block 44 is provided in correspondence with the fixed pulley block 43;

[0070] A connecting groove 45 is provided at the bottom of the movable pulley block 44, and the movable pulley block 44 is rotatably disposed in the connecting groove 45. The connecting groove 45 is fixedly connected to the lifting device connecting platform 7.

[0071] The steel wire rope 46 is wound around the drum 42 at both ends and passes through the movable pulley block 44 and the fixed pulley block 43 in the middle.

[0072] In other words, by controlling the rotation of the drum 42 through the drive component 41, the wire rope 46 is released. Then, under the transmission of the fixed pulley block 43 and the movable pulley block 44, the movable pulley block 44 drives the lifting platform 7 to move downward through the connecting groove 45. Under the combined action of the two sets of lifting devices 4, the lifting platform 7 is driven to move downward smoothly. The wire rope 46 is connected back and forth between multiple rollers in the fixed pulley block 43 and the movable pulley block 44, distributing the load to multiple contact points, effectively avoiding stress concentration at a single point, reducing the risk of structural fatigue, and extending the service life of the equipment. With the multi-point winding connection of the wire rope 46, the anti-sway and stability of the lifting platform 7 are effectively improved.

[0073] In this embodiment, the stabilizing device 5 includes:

[0074] The mounting bracket assembly 51 is fixed to the top of the lifting trolley 3;

[0075] The retractable stabilizing component 52 is movably mounted on the fixed frame component 51, and its bottom passes through the lifting trolley 3 and is fixedly connected to the lifting device connection platform 7.

[0076] In this embodiment, the fixing frame assembly 51 includes:

[0077] Four fixed columns 511 are arranged in a square shape and fixed to the top of the lifting trolley 3;

[0078] Two slide rails 512 are symmetrically distributed and fixed on the same side fixing column 511. One end of the slide rail 512 is fixedly connected by a connecting column. The inner side of the slide rail 512 is provided with a compression spring connected to the extension and retraction stabilization component 52.

[0079] The limiting roller 513 is rotatably mounted at the end of the slide rail 512 away from the connecting column and located outside the fixed column 511;

[0080] The guide roller 514 is rotatably mounted on the lower part of the fixed column 511 at the end away from the connecting column.

[0081] In this embodiment, the retraction and extension stabilization component 52 includes:

[0082] A movable shaft 521 is movably disposed within a slide rail 512 and is rotatably connected to the end of a compression spring. The movable shaft 521 is connected to a drive mechanism, which is movably disposed at the top of the slide rail 512.

[0083] The drive roller 522 is fixed in the middle of the moving shaft 521;

[0084] The single-sided chain plate 523 is wound around the drive roller 522 at one end, and the other end passes between the limit roller 513 and the guide roller 514, passes through the lifting trolley 3 and is fixedly connected to the lifting device connection platform 7.

[0085] In other words, in the initial state, the drive roller 522 is movably positioned between the slide rails 512 via the moving shaft 521. Under the pushing action of the compressed spring in the slide rail 512, the drive roller 522 is pushed to the position of the limiting roller 513, so that the single-sided chain plate 523 wound on the drive roller 522 is in contact with the limiting roller 513. The single-sided chain plate 523 passes vertically downward through the moving platform 31 between the limiting roller 513 and the guide roller 514 and is fixedly connected to the top of the lifting device connecting platform 7. When the lifting device 4 drives the lifting device connecting platform 7 to move downward via the wire rope 46, the drive mechanism (not shown in the figure) connected to the moving shaft 521 controls the drive via the moving shaft 521. As roller 522 rotates, it releases the single-sided chain plate 523. Guided by the limiting roller 513 and the guide roller 514, the single-sided chain plate 523 is synchronously conveyed downwards along with the lifting platform 7. As the single-sided chain plate 523 detaches from the drive roller 522, the overall diameter of the drive roller 522 and the single-sided chain plate 523 decreases. Then, under the action of the compression spring in the slide rail 512, it pushes the moving shaft 521 and the drive roller 522 towards the limiting roller 513. Simultaneously, the drive mechanism moves along the top of the slide rail 512, ensuring that the single-sided chain plate 523 on the drive roller 522 remains in contact with the limiting roller 513, meaning that the single-sided chain plate 523 output from the drive roller 522 always remains vertical. The lifting device 4 stabilizes the lifting platform 7, and under the combined action of multiple stabilizing devices 5, multiple single-sided chain plates 523 form a polygonal stabilizing structure to jointly position the lifting platform 7, maintaining its stability during movement or descent, and ensuring precise positioning of the lifting device and the connection point between the lifting device and the cargo. It is important to note that at least three sets of stabilizing devices 5 are provided, and the polygonal shape further enhances the stability of the lifting platform 7, ensuring precise positioning of the lifting device. When the lifting device 4 moves the lifting platform 7 upward via the wire rope 46 to lift the cargo, the drive mechanism controls the rotation of the drive roller 522 via the moving shaft 521. The single-sided chain plate 523 is retracted. As the single-sided chain plate 523 is retracted, the overall diameter of the drive roller 522 and the single-sided chain plate 523 increases. Then, under the action of the limiting roller 513, the drive roller 522 is pushed to move away from the limiting roller 513 on the slide rail 512 via the moving shaft 521. The drive mechanism moves along the top of the slide rail 512, compressing the compression spring inside the slide rail 512. Under the combined action of the limiting roller 513 and the guide roller 514, the single-sided chain plate 523, which is detached from the drive roller 522, is always kept in a vertical state to prevent the single-sided chain plate 523 from deflecting when it is connected to the lifting device connection platform 7, which would make it difficult to maintain the stability of the lifting device connection platform 7.

[0086] In a preferred embodiment, the stabilizing device 5 is provided in three sets in a ring, namely three sets of vertically arranged single-sided chain plates 523 which are fixedly connected to the spreader connecting platform 7. The three sets of single-sided chain plates 523 are arranged in a triangle on the spreader connecting platform 7. With the stability of the triangular structure and the unidirectional rotation characteristic of the single-sided chain plates 523, the spreader connecting platform 7 is kept in a horizontal state, stable and without deflection, which helps to assist the spreader and the cargo in precise positioning and connection. The single-sided chain plate 523 refers to the multiple plates that make up the single-sided chain plate 523, where two adjacent plates can only rotate to the same side.

[0087] In this embodiment, the positioning buffer device 6 includes:

[0088] The hydraulic positioning assembly 61 is fixed to the bottom of the mobile platform 31;

[0089] The locking component 62 is fixed at one end of the hydraulic positioning component 61 away from the middle of the crane trolley 3.

[0090] In this embodiment, the hydraulic positioning assembly 61 includes:

[0091] The hydraulic cylinder 611 is fixed to the bottom of the mobile platform 31, and a movable hydraulic shaft 612 is provided inside the end away from the center of the mobile platform 31.

[0092] Positioning plate 613 is fixed on hydraulic shaft 612;

[0093] The connecting plate 614 is fixed to the end of the hydraulic shaft 612 on one side and fixedly connected to the locking assembly 62 on the other side.

[0094] In this embodiment, the locking component 62 includes:

[0095] The connecting frame 621 is fixed to the side wall of the connecting plate 614;

[0096] The rotating locking block 622 is arranged in multiple groups horizontally, and each group has multiple blocks arranged vertically, and is rotatably mounted on the connecting frame 621.

[0097] In other words, when the trolley 3 moves laterally on the crossbeam 2, causing the bottom spreader of the spreader connection platform 7 to align with the cargo, taking the spreader installed at the bottom center of the spreader connection platform 7 as an example, the center of the spreader corresponds to the center of each set of positioning buffer devices 6. Calculate the distance between the rotating block 622 and the positioning plate 613 when the rotating block 622 rotates into the groove on the crossbeam 2, and the length of the hydraulic cylinder 611 body. The sum of the two is the distance between the groove into which the rotating block 622 is inserted and the target position of the spreader. It should be noted that the limit state of the rotation of the rotating block 622 is when the rotating block 622 rotates to the vertical state.

[0098] In a preferred embodiment, when the trolley 3 moves to the left on the crossbeam 2, the lifting device is moved by the lifting device connecting platform 7. When the distance between the lifting device and the target position is the same as the distance between the hydraulic cylinder 611 and the positioning plate 613, the positioning buffer device 6 on the left of the two sets of positioning buffer devices 6 is controlled to operate. This, in turn, controls the rotation block 622 in the connecting frame 621 to rotate, causing the rotation block 622 to rotate and engage in the groove on the crossbeam 2. This causes the trolley 3 to decelerate and move a certain distance under inertia, thus driving the hydraulic cylinder 611 to move. The hydraulic cylinder 611 moves along the hydraulic shaft 612 towards the positioning plate 613 until it is in contact with the positioning plate 613. At this point, the lifting device accurately reaches the target position. When the lifting device lifts the goods and needs to move them, the trolley 3 first moves to the right, causing the hydraulic cylinder 611 to move away from the positioning plate 613 along the hydraulic shaft 612 and return to its initial position. Then, during the movement of the trolley 3, the rotating block 622 rotates to reset and disengages from the slot on the crossbeam 2. Thus, the trolley 3 can move the goods laterally at will.

[0099] In specific implementation, initially, the lifting device 4, under the action of the wire rope 46, is fixedly connected to the lifting device connecting platform 7 via the movable pulley block 44. The bottom of the vertically set part of the single-sided chain plate 523 in the multiple sets of stabilizing devices 5 is fixedly connected to the lifting device connecting platform 7. The rotating block 622 in the positioning buffer device 6 is in a horizontal state. The moving platform 31 can move on the crossbeam 2, and the lifting device is installed at the bottom center of the lifting device connecting platform 7. When it is necessary to lift goods, the position of the connection between the lifting device and the goods is determined. The crossbeam 2 moves on the outrigger 1 so that the connection between the lifting device and the goods is located on the lateral movement trajectory of the lifting device. Then, the motor 33 drives the wheels 32, which in turn drives the moving platform 31 to move on the crossbeam 2. Between the distance between the lifting device and the target position... When the spacing is the same as the spacing between the hydraulic cylinder 611 and the positioning plate 613, the two front and rear positioning buffer devices 6 in the running direction of the lifting trolley 3 are controlled to operate, thereby controlling the rotation block 622 in the connecting frame 621 to rotate, so that the rotation block 622 rotates and engages in the groove on the crossbeam 2. Then the lifting trolley 3 decelerates and moves a certain distance under the action of inertia, driving the hydraulic cylinder 611 to move towards the positioning plate 613 on the hydraulic shaft 612 until the hydraulic cylinder 611 is in contact with the positioning plate 613. At this time, the lifting device accurately reaches the target position. Then the lifting device 4 drives the lifting device connecting platform 7 to move down through the wire rope 46. The drive mechanism on the slide rail 512 of the multiple stabilizing devices 5, which is connected to the moving shaft 521, controls the drive roller through the moving shaft 521. Rotation 522 releases the single-sided chain plate 523, allowing it to be synchronously conveyed downwards along with the lifting platform 7 under the joint guidance of the limiting roller 513 and the guide roller 514. As the single-sided chain plate 523 detaches from the drive roller 522, the overall diameter of the drive roller 522 and the single-sided chain plate 523 decreases. Consequently, under the action of the compression spring in the slide rail 512, the moving shaft 521 and the drive roller 522 are pushed towards the limiting roller 513. Simultaneously, the drive mechanism moves along the top of the slide rail 512, ensuring that the single-sided chain plate 523 on the drive roller 522 remains in contact with the limiting roller 513. That is, the single-sided chain plate 523 output from the drive roller 522 always remains vertical. Furthermore, under the combined action of multiple sets of stabilizing devices 5, multiple single-sided chain plates... 523 forms a multi-deformation stable structure, which provides common positioning for the lifting device connecting platform 7, maintaining stability during movement and descent. This ensures precise positioning and connection of the lifting device and the cargo. The lifting device 4 then uses the wire rope 46 to move the lifting device connecting platform 7 upwards, lifting the cargo. The drive mechanism controls the drive roller 522 to rotate via the moving shaft 521, retracting the single-sided chain plate 523 and assisting the lifting device connecting platform 7 in smoothly lifting the cargo. The lifting trolley 3 then moves in the opposite direction, causing the hydraulic cylinder 611 to move away from the positioning plate 613 on the hydraulic shaft 612, returning to its initial position. During the movement of the lifting trolley 3, the rotating block 622 rotates to reset, disengaging from the slot on the crossbeam 2.Furthermore, the lifting trolley 3 can move the goods laterally at will, and with the combined action of the stabilizing device 5, the lifting device 4, and the positioning and buffering device 6, the goods are accurately transported to the target location.

[0100] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A gantry crane with a precise positioning structure, characterized in that: include: Outrigger (1), vertical support structure; Two crossbeams (2) are symmetrically distributed front and back, and are movable on the two side legs (1). The crossbeams (2) are provided with multiple sets of grooves distributed laterally. The crane trolley (3) is laterally mounted on the crossbeam (2); The lifting device (4) is provided in two sets symmetrically distributed on the left and right sides and fixed on the lifting trolley (3); The stabilizing device (5) is arranged in multiple rings and fixed on the lifting trolley (3), located between the lifting devices (4) at both ends; The positioning buffer device (6) is provided in two sets symmetrically distributed in front and back, and two sets are provided symmetrically distributed in each set. It is fixed at the bottom of the lifting trolley (3) and corresponds to the groove on the crossbeam (2). The lifting platform (7) is fixed to the bottom of the lifting device (4) and is fixedly connected to the bottom of the stabilizing device (5); The stabilizing device (5) includes: The mounting bracket assembly (51) is fixed to the top of the crane trolley (3); The retractable stabilizing component (52) is movably mounted on the fixed frame component (51), and its bottom passes through the lifting trolley (3) and is fixedly connected to the lifting device connection platform (7); The mounting bracket assembly (51) includes: Four fixed columns (511) are arranged in a square shape and fixed to the top of the crane trolley (3); Two slide rails (512) are symmetrically distributed and fixed on the same side fixed column (511). One end of the slide rail (512) is fixedly connected by a connecting column. The inner side of the slide rail (512) is provided with a compression spring connected to the retraction and extension stabilizing assembly (52). The limiting roller (513) is rotatably mounted on the slide rail (512) at the end away from the connecting column and is located outside the fixed column (511); The guide roller (514) is rotatably mounted on the lower part of the fixed column (511) at the end away from the connecting column; The retraction and extension stabilization component (52) includes: A movable shaft (521) is movably disposed within a slide rail (512) and rotatably connected to the end of a compression spring. The movable shaft (521) is connected to a drive mechanism, which is movably disposed at the top of the slide rail (512). The drive roller (522) is fixed in the middle of the moving shaft (521); One end of the single-sided chain plate (523) is wound around the drive roller (522), and the other end passes between the limit roller (513) and the guide roller (514), passes through the lifting trolley (3) and is fixedly connected to the lifting device connection platform (7); The positioning buffer device (6) includes: A hydraulic positioning assembly (61) is fixed to the bottom of the mobile platform (31); The locking component (62) is fixed at one end of the hydraulic positioning component (61) away from the middle of the trolley (3); The locking component (62) includes: The connecting frame (621) is fixed to the side wall of the connecting plate (614); The rotating block (622) is provided in multiple groups distributed horizontally, and each group is provided in multiple groups distributed vertically, and is rotatably mounted on the connecting frame (621).

2. A gantry crane with a precise positioning structure according to claim 1, characterized in that: The crane trolley (3) consists of a mobile platform (31), wheels (32) and an electric motor (33). The mobile platform (31) is mounted on the crossbeam (2) by the wheels (32). The wheels (32) are driven by the electric motor (33). The bottom of the mobile platform (31) on the same side of the wheels (32) is fixedly connected to a positioning buffer device (6) corresponding to the crossbeam (2).

3. A gantry crane with a precise positioning structure according to claim 1, characterized in that: The lifting device (4) includes: The drive assembly (41) is fixed on the crane trolley (3); The drum (42) is fixed on the drive assembly (41) and is driven to rotate by the drive assembly (41); Fixed pulley block (43) is fixed to the bottom of the lifting trolley (3); The movable pulley block (44) is set in correspondence with the fixed pulley block (43); A connecting groove (45) is provided at the bottom of the movable pulley block (44), and the movable pulley block (44) is rotatably provided in the connecting groove (45). The connecting groove (45) is fixedly connected to the lifting device connecting platform (7). The wire rope (46) is wound around the drum (42) at both ends and passes around the movable pulley block (44) and the fixed pulley block (43) in the middle.

4. A gantry crane with a precise positioning structure according to claim 1, characterized in that: The hydraulic positioning assembly (61) includes: The hydraulic cylinder (611) is fixed to the bottom of the mobile platform (31), and a movable hydraulic shaft (612) is provided inside the end away from the center of the mobile platform (31). The positioning plate (613) is fixed on the hydraulic shaft (612); The connecting plate (614) is fixed on one side to the end of the hydraulic shaft (612) and fixedly connected to the locking assembly (62) on the other side.

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