Portal crane for railway loading and unloading and construction method

Abstract

The invention discloses a portal crane for railway loading and unloading and a construction method and relates to the field of hoisting equipment. The portal crane for railway loading and unloading comprises at least two main beams arranged in parallel, a crane carriage, at least two conversion supports, two stand columns and two tire walking mechanisms connected to the bottoms of the two stand columns correspondingly. Tracks extending in the length direction of the main beams are arranged on the main beams. The hoisting trolley is movably arranged on each track; the at least two conversion supports are symmetrically connected to the bottoms of the main beams in a manner of rotating around the vertical axis, and the two ends of the conversion supports are configured to rotate along the vertical plane so as to support the ground or be folded; the two stand columns are connected to the bottoms of the two ends of each main beam in a telescopic mode in the height direction. According to the portal crane for railway loading and unloading and the construction method provided by the invention, the problem that large hoisting equipment cannot enter a station from a road and cannot be self-assembled under the working condition of no external hoisting equipment is solved.

Description

Technical Field

[0001] This application relates to the field of lifting equipment, and more specifically, to a gantry crane for railway loading and unloading and a construction method thereof. Background Technology

[0002] In recent years, with the rapid development of steel structure bridge construction, in-service bridges have begun to show defects such as coating deterioration, steel plate corrosion, and weld cracking, resulting in reduced durability, shortened service life, and excessively high maintenance costs. Therefore, strengthening the maintenance and management of bridges during their operation period has become an urgent problem to be solved for steel structure bridges.

[0003] Currently, the replacement of steel structure bridges mainly involves using cranes and other lifting equipment to remove the old beams and install the new ones. Since railway steel beams often weigh over 100 tons, two large-tonnage cranes are needed to work together, which is costly and inefficient. The replacement process requires a long period of track occupancy, while the track maintenance windows provided by the operating lines are too short to meet the construction requirements. In addition, the transportation of new beams and old beams requires customized special vehicles and high requirements for the transportation roads, which necessitates the hardening of roads, thus increasing the construction period and cost. Summary of the Invention

[0004] The purpose of this application is to provide a gantry crane for railway loading and unloading and a construction method, which solves the problem of self-assembly when large lifting equipment cannot enter the station from the road and when there is no external lifting equipment.

[0005] This application is implemented as follows: This application provides a gantry crane for railway loading and unloading, comprising: At least two parallel main beams are provided, and the main beams are provided with tracks extending along their length. The crane trolley is movable and mounted on each track; At least two transfer braces are symmetrically connected to the bottom of each main beam in a rotatable manner about a vertical axis. The two ends of the transfer braces are configured to rotate along the vertical plane to support the ground or retract. Two columns are connected to the bottom of each main beam at both ends, which can extend and retract along the height direction. Two tire-running mechanisms are connected to the bottom of the two columns respectively.

[0006] In some alternative implementations, the conversion support includes a support beam detachably connected to each main beam, a slewing mechanism rotatably connected at the top to the bottom of the support beam, two beams connected to both sides of the slewing mechanism, and two primary columns hinged to the two beams respectively, the two primary columns being rotatable in the direction of approaching or moving away from the corresponding beam.

[0007] In some alternative implementations, a secondary column is inserted into the bottom of each primary column, and a tertiary column is inserted into the bottom of each secondary column. The primary and secondary columns are connected by pins, and the secondary and tertiary columns are connected by pins.

[0008] In some alternative implementations, the slewing mechanism includes a lifting shaft, a slewing bracket suspended below the lifting shaft, and a bearing housing connected to the bottom of a support beam. The bearing housing is connected to a bearing located above the slewing bracket and fitted onto the lifting shaft. The top of the lifting shaft rotatably extends through the support beam and is connected to a nut.

[0009] In some alternative implementations, the end of the lifting shaft that extends through the support beam is also fitted with a locking washer located below the nut and a pad located below the locking washer.

[0010] In some alternative implementations, the column includes a crossbeam sleeve connected to one end of each main beam, at least two upper support columns, a lifting cylinder, and a fixed support leg connected to the bottom of each upper support column. The crossbeam sleeve is slidably fitted onto each upper support column. The two ends of the lifting cylinder are respectively connected to the fixed support leg and the crossbeam sleeve. The bottom of the fixed support leg is connected to a tire traveling mechanism.

[0011] In some alternative embodiments, the tire running mechanism includes a support frame, a frame rotatably connected to the support frame about a vertical axis, and a tire rotatably connected to the frame. The support frame is connected to a rotary drive mechanism for driving the frame to rotate about the vertical axis, and the frame is connected to a traverse drive mechanism for driving the tire to rotate.

[0012] In some alternative implementations, the frame is rotatably connected to the support frame via a connecting shaft. The rotary drive mechanism includes a rotary motor connected to the support frame, a first bevel gear sleeved on the output shaft of the rotary motor, and a second bevel gear meshing with the first bevel gear. The second bevel gear is fixedly sleeved on the connecting shaft. The support frame is connected to an angle sensor for detecting the rotation angle of the connecting shaft.

[0013] In some alternative implementations, the motion drive mechanism includes a traveling geared motor, a drive sprocket connected to the output shaft of the traveling geared motor, a driven sprocket coaxially connected to the tire, and a transmission chain respectively sleeved on the drive sprocket and the driven sprocket.

[0014] This application also provides a construction method for a railway loading and unloading gantry crane, which is carried out using the aforementioned railway loading and unloading gantry crane, and includes the following steps: After the gantry crane used for loading and unloading is disassembled from its lifting trolley and tire traveling mechanism, it is supported by a flatcar and transported to the station. Control at least two transition supports to rotate about a vertical axis from parallel to the main beam to perpendicular to the main beam; Control the two columns to extend along the height direction to push the main beam to its highest position; Rotate the retractable conversion support along the vertical plane to the supporting ground; Controlling the two columns to retract along the height direction drives the main beam to descend, and makes the transfer support support the ground, so that the railway loading and unloading gantry crane is detached from the flatcar and suspended in the air; After unloading the lifting trolley and tire traveling mechanism, move the flatcar away from under the railway loading and unloading gantry crane; Install the tire traveling mechanism on a railway loading and unloading gantry crane; Control the two columns to extend along the height direction so that the tire traveling mechanism of the railway loading and unloading gantry crane is supported on the ground and lifts the main beam upward, and install the lifting trolley on the railway loading and unloading gantry crane; The control transfer support rotates and retracts along the vertical plane, then rotates around the vertical axis until it is parallel to the main beam; The conversion support is removed, allowing the railway loading and unloading gantry crane to simultaneously cross the railway line and the beam assembly area via the tire traveling mechanism.

[0015] The beneficial effects of this application are as follows: The railway loading and unloading gantry crane provided by this application includes at least two parallel main beams, a lifting trolley, at least two transfer supports, two columns, and two tire traveling mechanisms respectively connected to the bottom of the two columns. The main beams are provided with rails extending along their length direction; the lifting trolley is movably mounted on each rail; at least two transfer supports are symmetrically connected to the bottom of each main beam in a rotatable manner about a vertical axis, and the two ends of the transfer supports are configured to rotate along the vertical plane to support the ground or retract; the two columns are respectively telescopically connected to the bottom of both ends of each main beam in a height direction. The railway loading and unloading gantry crane and construction method provided in this application have a conversion support connected to the bottom of the main beam that can rotate around the vertical axis and along the vertical plane. The conversion support can be folded up to facilitate the flatcar transport of the railway loading and unloading gantry crane through the tunnel, and the conversion support can be unfolded at the station to support the railway loading and unloading gantry crane to be unloaded, installed and moved for loading and unloading beams and goods and construction. This solves the problem of self-assembly when large lifting equipment cannot enter the station from the road and when there is no external lifting equipment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1A first-view structural schematic diagram of a railway loading and unloading gantry crane provided in an embodiment of this application; Figure 2 A second-view structural schematic diagram of a railway loading and unloading gantry crane provided in an embodiment of this application; Figure 3 This is a schematic diagram of the transfer support in a railway loading and unloading gantry crane provided in an embodiment of this application; Figure 4 A cross-sectional structural schematic diagram of the slewing mechanism of the transfer support in the railway loading and unloading gantry crane provided in the embodiments of this application; Figure 5 A first-view structural schematic diagram of the tire traveling mechanism in a railway loading and unloading gantry crane provided in an embodiment of this application; Figure 6 A second-view structural schematic diagram of the tire traveling mechanism in a railway loading and unloading gantry crane provided in an embodiment of this application; Figure 7 A schematic diagram of the structure of the construction method of the railway loading and unloading gantry crane provided in the embodiments of this application, which uses a flatcar to support the gantry frame, a lifting trolley and a tire traveling mechanism for transportation. Figure 8 A schematic diagram of the structure in the construction method of the railway loading and unloading gantry crane provided in the embodiments of this application, which controls the two conversion supports of the gantry to rotate 90 degrees around the lifting shaft so that the two crossbeams of the conversion supports are rotated from parallel to the main beam to perpendicular to the main beam; Figure 9 A schematic diagram of the structure in the construction method of the railway loading and unloading gantry crane provided in the embodiments of this application, in which the cylinder rods of the lifting cylinders controlling the two columns extend to push the main beam to rise to the highest position along the height direction; Figure 10 A schematic diagram of the structure in which the conversion support is adjusted to the deployed state in the construction method of the railway loading and unloading gantry crane provided in the embodiments of this application; Figure 11 A schematic diagram of the construction method for a railway loading and unloading gantry crane provided in this application embodiment, in which the three-stage columns of the two conversion supports are supported on the ground, so that the railway loading and unloading gantry crane is detached from the flatcar and suspended in the air; Figure 12 A schematic diagram of the structure of the construction method of the railway loading and unloading gantry crane provided in the embodiments of this application, in which the lifting trolley and tire traveling mechanism are unloaded from the flatcar and the flatcar is driven away; Figure 13 A schematic diagram of the structure in which the tire traveling mechanism is installed at the bottom of the two fixed legs of the railway loading and unloading gantry crane in the construction method of the railway loading and unloading gantry crane provided in the embodiments of this application; Figure 14A schematic diagram of the construction method for a railway loading and unloading gantry crane provided in this application embodiment, in which the tire traveling mechanism of the railway loading and unloading gantry crane is supported on the ground, the conversion support is suspended in the air, and the lifting trolley is installed. Figure 15 A schematic diagram of the structure in which the conversion support is adjusted to a retracted state in the construction method of the railway loading and unloading gantry crane provided in the embodiments of this application; Figure 16 This is a schematic diagram of the structure of the railway loading and unloading gantry crane provided in the embodiment of this application, which controls the frame and tires of the tire traveling mechanism to rotate 90 degrees after the removal of the conversion support and then hoisting the steel beam.

[0018] In the diagram: 100, main beam; 110, track; 120, lifting trolley; 200, conversion support; 210, support beam; 220, slewing mechanism; 221, lifting shaft; 222, slewing bracket; 223, bearing housing; 224, bearing; 225, nut; 226, locking washer; 227, pad; 230, beam; 240, primary column; 250, secondary column; 260, tertiary column; 270, pin; 300, column; 310, beam sleeve; 320, upper support column; 330. Lifting cylinder; 340. Fixed outrigger; 350. Diesel engine pump set; 360. Hydraulic oil tank; 370. Diesel tank; 400. Tire traveling mechanism; 410. Support frame; 420. Chassis; 430. Tire; 440. Rotary motor; 441. First bevel gear; 442. Second bevel gear; 443. Connecting shaft; 450. Traveling geared motor; 451. Drive sprocket; 452. Driven sprocket; 453. Transmission chain; 460. Angle sensor; 500. Flatcar. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The features and performance of the railway loading and unloading gantry crane and construction method of this application are further described in detail below with reference to embodiments.

[0027] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown in the figure, this application provides a gantry crane for railway loading and unloading, which includes two parallel main beams 100, a lifting trolley 120, two conversion supports 200, two columns 300 and two tire traveling mechanisms 400; wherein, each main beam 100 is provided with a track 110 extending along its length direction; the bottom of both ends of the lifting trolley 120 is respectively connected to movable wheels rotatably provided on the two tracks 110, and the lifting trolley 120 is also provided with a motor drive mechanism for driving the movable wheels to rotate and a lifting mechanism for lifting beams and heavy objects; Two transition supports 200 are symmetrically connected to the bottom of two main beams 100, each rotatably rotatable about a vertical axis. The ends of each transition support 200 can rotate along a vertical plane to support the ground or retract. Each transition support 200 includes a support beam 210 detachably connected to the two main beams 100 at both ends by bolts, a slewing mechanism 220 rotatably connected to the bottom of the support beam 210 at its top, two beams 230 connected to both sides of the slewing mechanism 220, and two primary columns 240, each hinged at one end to one of the beams 230 by folding pins. The two primary columns 240 can rotate towards or away from their respective beams 230. A secondary column 250 is inserted into the bottom of each primary column 240, and a tertiary column is inserted into the bottom of each secondary column 250. The column 260, the primary column 240 and the corresponding secondary column 250, and the secondary column 250 and the corresponding tertiary column 260 are respectively connected by pins 270; the slewing mechanism 220 includes a hanging shaft 221, a slewing bracket 222 hanging below the hanging shaft 221 and a bearing seat 223 connected to the bottom of the support beam 210. The bearing seat 223 is connected to a bearing 224 located above the slewing bracket 222 and sleeved on the hanging shaft 221. The top of the hanging shaft 221 rotatably passes through the support beam 210 and is connected to a nut 225. The end of the hanging shaft 221 that passes through the support beam 210 is also sleeved with a stop washer 226 located below the nut 225 and a pad 227 located below the stop washer 226. The two sides of the slewing bracket 222 are respectively connected to two beams 230.

[0028] Two columns 300 are telescopically connected to the bottom ends of two main beams 100 along the height direction. Each column 300 includes a crossbeam sleeve 310 connected to one end of each main beam 100, two upper support columns 320, a lifting cylinder 330, and a fixed support leg 340 connected to the bottom of each upper support column 320. The crossbeam sleeve 310 is slidably sleeved on each upper support column 320. The two ends of the lifting cylinder 330 are connected to the fixed support leg 340 and the crossbeam sleeve 310, respectively. The bottom of the fixed support leg 340 is connected to a tire traveling mechanism 400. A diesel engine pump set 350, a hydraulic oil tank 360, and a diesel tank 370 are installed on the fixed support leg 340 to provide power to the lifting cylinder 330.

[0029] Two tire-running mechanisms 400 are respectively connected to the bottom of two columns 300. Each tire-running mechanism 400 includes a support frame 410 connected to the bottom of a fixed support leg 340, a frame 420 rotatably connected to the support frame 410 about a vertical axis, and a tire 430 rotatably connected to the frame 420. The support frame 410 is connected to a rotary drive mechanism for driving the frame 420 to rotate about a vertical axis. The frame 420 is connected to a moving drive mechanism for driving the tire 430 to rotate. The frame 420 is rotatably connected to the support frame 410 via a connecting shaft 443. The rotary drive mechanism includes components connected to the support frame 410... The rotary motor 440 of the 10, the first bevel gear 441 sleeved on the output shaft of the rotary motor 440, and the second bevel gear 442 meshing with the first bevel gear 441, the second bevel gear 442 being fixedly sleeved on the connecting shaft 443, the support frame 410 being connected to an angle sensor 460 for detecting the rotation angle of the connecting shaft 443, and the moving drive mechanism including a traveling geared motor 450, a drive sprocket 451 connected to the output shaft of the traveling geared motor 450, a driven sprocket 452 coaxially connected to the tire 430, and a transmission chain 453 respectively sleeved on the drive sprocket 451 and the driven sprocket 452.

[0030] This application also provides a construction method for a railway loading and unloading gantry crane, which is carried out using the aforementioned railway loading and unloading gantry crane, and includes the following steps: Step 1, such as Figure 7 As shown, after disassembling the trolley 120 and tire traveling mechanism 400 of the railway loading and unloading gantry crane, a gantry frame is obtained. The gantry frame, trolley 120 and tire traveling mechanism 400 are placed on a flat car 500 for reinforcement. The two crossbeams 230 of the conversion support 200 are rotated around the lifting shaft 221 to be parallel to the main beam 100. Then, the two primary columns 240 of the conversion support 200 are folded and fixed in the direction close to the two crossbeams 230, so that the conversion support 200 is in a folded state. Then, a locomotive is used to pull the flat car 500 to support the gantry frame, trolley 120 and tire traveling mechanism 400 and transport them to the station. Step 2, as follows Figure 8 As shown, the two conversion supports 200 of the control gantry are rotated 90 degrees around the hanging shaft 221, so that the two crossbeams 230 of the conversion support 200 are rotated from parallel to the main beam 100 to perpendicular to the main beam 100. Step 3, as follows Figure 9 As shown, the cylinder rods of the lifting cylinders 330 that control the two columns 300 extend to push the main beam 100 to rise to the highest position along the height direction; Step 4, as follows Figure 10 As shown, the two primary columns 240 of the two retracted conversion supports 200 are folded away from the two crossbeams 230 and arranged vertically. The pins 270 are pulled out so that the secondary columns 250 and tertiary columns 260 extend downwards respectively. Then the pins 270 are used again to fix them so that the conversion supports 200 are in the unfolded state. Step 5, as follows Figure 11 As shown, the cylinder rods of the lifting cylinders 330 controlling the two columns 300 retract, causing the main beam 100 to descend and the three-stage columns 260 of the two conversion supports 200 to be supported on the ground, so that the railway loading and unloading gantry crane is detached from the flatcar 500 and suspended in the air. Step Six, as Figure 12 As shown, after unloading the lifting trolley 120 and tire traveling mechanism 400 from the flatcar 500, the flatcar 500 is driven away from under the railway loading and unloading gantry crane. Step 7, as follows Figure 13 As shown, the tire traveling mechanism 400 is installed at the bottom of the two fixed legs 340 of the railway loading and unloading gantry crane; Step 8, as Figure 14 As shown, the cylinder rods of the lifting cylinders 330 controlling the two columns 300 extend to support the tire traveling mechanism 400 of the railway loading and unloading gantry crane on the ground and lift the main beam 100 and the conversion support 200 upward, so that the conversion support 200 is suspended in the air, and the lifting trolley 120 is installed on the track 110 on the two main beams 100 of the railway loading and unloading gantry crane. Step Nine, as Figure 15 As shown, the two crossbeams 230 of the conversion support 200 are rotated around the hanging shaft 221 until they are parallel to the main beam 100. Then, the pin 270 is pulled out and the secondary column 250 and the tertiary column 260 are retracted upwards respectively. The pin 270 is then used to fix them again. The two primary columns 240 of the conversion support 200 are folded towards the two crossbeams 230 and then fixed, so that the conversion support 200 is in a retracted state. Step 10, as follows Figure 16As shown, after removing the conversion support 200, the slewing motor 440 of the railway loading and unloading gantry crane drives the first bevel gear 441 to rotate, which in turn drives the meshing second bevel gear 442 and connecting shaft 443 to rotate, thereby driving the frame 420 and tire 430 to rotate 90 degrees. Subsequently, the traveling reduction motor 450 of the moving drive mechanism drives the drive sprocket 451 to rotate, which in turn drives the driven sprocket 452 and tire 430 to rotate through the transmission chain 453. This causes the two tire traveling mechanisms 400 to drive the railway loading and unloading gantry crane to travel to a suitable position and cross the railway line and the beam assembly area. After the steel beam is assembled, it is lifted by the lifting trolley 120 of the railway loading and unloading gantry crane and hoisted onto the flatcar 500. After the old beam is recycled, it is unloaded from the flatcar 500 and transported to the beam storage area.

[0031] The railway loading and unloading gantry crane and construction method provided in this application have two conversion supports 200 connected to the bottom of the main beam 100 of the railway loading and unloading gantry crane. These supports can rotate around a vertical axis and rotate along a vertical plane at both ends. During transportation, the conversion supports 200 can be folded up to facilitate the flatcar 500 to transport the railway loading and unloading gantry crane, reducing its size for transport through tunnels. At the station, the conversion supports 200 can be unfolded to support the railway loading and unloading gantry crane to detach from the flatcar 500 for unloading, installation, and movement for loading, unloading beams and goods, and for construction. This solves the problem of self-assembly when large lifting equipment cannot enter the station from the road or when there is no external lifting equipment. For bridges that need to be replaced, after the new beam is assembled by the manufacturing group at the construction site, it is hoisted by the railway loading and unloading gantry crane onto the self-propelled transport flatbed of the beam replacement unit. The self-propelled transport flatbed carries the new beam to the beam replacement position. After the self-propelled transport flatbed transports the old beam back, the railway loading and unloading gantry crane is used to unload the old beam and place it in the beam stacking area. The two columns 300 of the railway loading and unloading gantry crane are connected to the tire traveling mechanism 400 at the bottom, which is highly mobile and can realize straight and diagonal movement, general turning, figure-eight turning and rotation in place. It is convenient for loading and unloading across lines. Moreover, the crane is self-powered and can operate without external power supply.

[0032] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A gantry crane for railway loading and unloading, characterized in that, It includes: At least two parallel main beams, each main beam having a track extending along its length; The lifting trolley is movably mounted on each of the aforementioned tracks; At least two transfer supports are symmetrically connected to the bottom of each of the main beams in a rotatable manner about a vertical axis, and the two ends of the transfer supports are configured to rotate along the vertical plane to support the ground or retract. Two columns are retractably connected to the bottom of both ends of each of the main beams along the height direction; Two tire-running mechanisms are respectively connected to the bottom of the two columns.

2. The gantry crane for railway loading and unloading according to claim 1, characterized in that, The conversion support includes a support beam detachably connected to each of the main beams, a slewing mechanism rotatably connected to the bottom of the support beam, two beams connected to both sides of the slewing mechanism, and two primary columns hinged to the two beams respectively. The two primary columns can rotate in the direction of approaching or moving away from the corresponding beam.

3. The gantry crane for railway loading and unloading according to claim 2, characterized in that, Each primary column is connected to a secondary column at its bottom, and each secondary column is connected to a tertiary column at its bottom. The primary and secondary columns, as well as the secondary and tertiary columns, are connected by pins.

4. The gantry crane for railway loading and unloading according to claim 3, characterized in that, The slewing mechanism includes a lifting shaft, a slewing bracket hanging below the lifting shaft, and a bearing seat connected to the bottom of the support beam. The bearing seat is connected to a bearing located above the slewing bracket and sleeved on the lifting shaft. The top of the lifting shaft rotatably extends through the support beam and is connected to a nut.

5. The gantry crane for railway loading and unloading according to claim 4, characterized in that, The end of the hanging shaft that extends through the supporting beam is also fitted with a stop washer located below the nut and a pad located below the stop washer.

6. The gantry crane for railway loading and unloading according to claim 1, characterized in that, The column includes a crossbeam sleeve connected to one end of each of the main beams, at least two upper support columns, a lifting cylinder, and a fixed support leg connected to the bottom of each of the upper support columns. The crossbeam sleeve is slidably sleeved on each of the upper support columns. The two ends of the lifting cylinder are respectively connected to the fixed support leg and the crossbeam sleeve. The bottom of the fixed support leg is connected to the tire traveling mechanism.

7. The gantry crane for railway loading and unloading according to claim 1, characterized in that, The tire running mechanism includes a support frame, a frame rotatably connected to the support frame about a vertical axis, and a tire rotatably connected to the frame. The support frame is connected to a rotary drive mechanism for driving the frame to rotate about a vertical axis, and the frame is connected to a mobile drive mechanism for driving the tire to rotate.

8. The gantry crane for railway loading and unloading according to claim 7, characterized in that, The frame is rotatably connected to the support frame via a connecting shaft. The rotary drive mechanism includes a rotary motor connected to the support frame, a first bevel gear sleeved on the output shaft of the rotary motor, and a second bevel gear meshing with the first bevel gear. The second bevel gear is fixedly sleeved on the connecting shaft. The support frame is connected to an angle sensor for detecting the rotation angle of the connecting shaft.

9. The gantry crane for railway loading and unloading according to claim 7, characterized in that, The mobile drive mechanism includes a traveling geared motor, a drive sprocket connected to the output shaft of the traveling geared motor, a driven sprocket coaxially connected to the tire, and a transmission chain respectively sleeved on the drive sprocket and the driven sprocket.

10. A construction method for a railway loading and unloading gantry crane, characterized in that, It is carried out using a railway loading and unloading gantry crane as described in any one of claims 1 to 9, and includes the following steps: After the gantry crane used for loading and unloading is disassembled from its lifting trolley and tire traveling mechanism, it is supported by a flatcar and transported to the station. Control at least two conversion supports to rotate about a vertical axis from parallel to the main beam to perpendicular to the main beam; Control the two columns to extend along the height direction to push the main beam to its highest position; Rotate the retracted conversion support along the vertical plane to the supporting ground; Controlling the two columns to retract along the height direction drives the main beam to descend, and makes the conversion support support the ground, so that the railway loading and unloading gantry crane is detached from the flatcar and suspended in the air; After unloading the lifting trolley and the tire traveling mechanism, the flatcar is driven away from under the railway loading and unloading gantry crane. The tire traveling mechanism is installed on the railway loading and unloading gantry crane; Control the two columns to extend along the height direction so that the tire traveling mechanism of the railway loading and unloading gantry crane is supported on the ground and the main beam is lifted upward, and install the lifting trolley on the railway loading and unloading gantry crane; The conversion support is controlled to rotate and retract along the vertical plane, and then rotate around the vertical axis until it is parallel to the main beam; Remove the conversion support so that the railway loading and unloading gantry crane can simultaneously cross the railway line and the beam assembly area via the tire traveling mechanism.

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