A method for flange pairing of a portal crane

Abstract

A method for assembling flanges for gantry cranes, relating to the field of crane manufacturing technology, includes four steps: flange fabrication, leg component assembly, leg flange assembly, and main beam flange assembly. After firmly assembling the leg flange plates and main beam flange plates in pairs, hole drilling and integrated machining of the reference edges are performed. Precise assembly of the leg flanges and leg components is achieved on a side-mounting workbench using the dual constraints of reference holes and reference edges. During main beam assembly, the spacing is adjusted using fixed and movable flat-mounting workbenches, and the main beam is horizontally hoisted to simulate self-weight deflection and pre-camber. This invention moves the core processes to a controllable workshop environment, eliminating accumulated errors from single-piece processing, ensuring the interchangeability of paired flanges, achieving "zero-repair" on-site docking and natural fit of the connecting surfaces, significantly improving assembly accuracy, assembly efficiency, and construction safety, and is suitable for high-quality assembly of large gantry cranes.

Description

Technical Field

[0001] This invention relates to the field of crane manufacturing technology, and in particular to a method for assembling flanges for gantry cranes. Background Technology

[0002] In the field of gantry crane manufacturing, flange connections are a crucial connection point between the outriggers and core components such as the main beam, and their assembly accuracy directly determines the overall structural stability and service safety of the crane. However, existing technologies generally suffer from systemic defects:

[0003] In traditional processes, flange plates are often processed individually. The lack of coordinated control between hole drilling and reference edge treatment leads to large deviations in the concentricity of holes in paired flanges and poor consistency in the straightness and flatness of the reference edges. During on-site assembly, problems such as bolt hole misalignment and poor fit of the connection surfaces frequently occur, forcing manual hole repair or forced tightening, which not only weakens the reliability of the connection but also creates a risk of fatigue fracture.

[0004] Meanwhile, the assembly operation is highly dependent on on-site high-altitude operations, significantly affected by environmental interference such as wind load and ground settlement, and lacks a unified and reproducible positioning benchmark system. Workers need to repeatedly mark lines and make multiple measurements and adjustments, resulting in serious accumulation of human error, low efficiency, and large quality fluctuations. Existing processes generally ignore the impact of static deflection caused by the main beam's self-weight, and no reasonable pre-camber is set during flange assembly, leading to forced contact of the connection surfaces during on-site installation, generating additional stress and accelerating structural damage.

[0005] Furthermore, conventional adjustment fixtures are mostly simple mechanical structures, and flange spacing adjustment relies on visual inspection, tape measure measurement, and manual fine-tuning, making it difficult to guarantee repeatability and positioning accuracy. Although gantry cranes require millimeter-level assembly accuracy, their large size means that measuring tools are typically tape measures. Therefore, existing gantry crane flange assembly methods are not only inefficient but also fail to guarantee millimeter-level tolerance requirements. These shortcomings collectively lead to extended assembly cycles, high rework rates, and increased on-site safety risks, severely restricting the manufacturing efficiency and quality consistency of large lifting equipment. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention discloses a method for assembling flanges for gantry cranes.

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0008] A method for assembling flanges for a gantry crane includes the following steps:

[0009] S1. Fabricate flanges. Align the edges of two flange plates and assemble them firmly together. The two flange plates in the same group are the support flange plate and the main beam flange plate, respectively. After assembly, drill holes and flatten the reference edge. Select one of the holes and the reference edge as the positioning reference for subsequent assembly operations. Fabricate four groups.

[0010] S2. Fabricate outrigger components; Assemble and fix the two outriggers of the crane to the ground beam assembly to form outrigger components, and fabricate two sets;

[0011] S3. Leg flange assembly: Take two leg flanges and install them on the vertical table of the side mounting workbench according to their respective positioning references. Adjust the distance between the two leg flanges according to the design dimensions. Hoist a set of leg components so that the symmetrical center lines of the two legs are aligned with the symmetrical center lines of the two leg flanges on the side mounting workbench. Spot weld the legs to the corresponding leg flanges. Complete the assembly operation of the two sets of leg components and leg flanges in sequence.

[0012] S4. Main beam flange assembly: Take two main beam flanges and install them on the horizontal platform of the fixed flat workbench according to their respective positioning references. Adjust the distance between the two main beam flanges according to the design dimensions. Install the other two main beam flanges on the horizontal platform of the movable flat workbench according to their respective positioning references, and make the distance between the two main beam flanges on the movable flat workbench consistent with the distance between the two main beam flanges on the fixed flat workbench. Adjust the distance between the fixed flat workbench and the movable flat workbench according to the design dimensions. Hoist the main beam to the top of the four main beam flanges and spot weld the main beam flanges to the main beam.

[0013] Preferably, two sets of adjustment and positioning devices are symmetrically installed on the side-mounted worktable, the fixed flat-mounted worktable, and the movable flat-mounted worktable; the side-mounted worktable and the fixed flat-mounted worktable are provided with clamping devices for clamping the flange plates on the table surface corresponding to the adjustment and positioning devices; the adjustment and positioning devices include hole position adjustment and positioning devices installed inside the side-mounted worktable, the fixed flat-mounted worktable, and the movable flat-mounted worktable, and reference edge positioning devices installed on their respective table surfaces.

[0014] Preferably, the hole position adjustment and positioning device includes:

[0015] Fixed base;

[0016] The slide rails consist of two parallel, spaced-apart rails mounted on a fixed base.

[0017] The positioning plate is slidably connected to the slide rail via a slider.

[0018] The positioning pin is installed on the positioning plate and can be matched with the selected reference hole position on the flange plate; the table surface of the side-mounted worktable, the fixed flat worktable and the movable flat worktable are all provided with strip holes that allow the positioning pin to pass through, and the length axis of the strip hole is parallel to the length axis of the slide rail.

[0019] A linear drive assembly is mounted on a fixed base. The moving part of the linear drive assembly is connected to the positioning plate via a bracket and is used to drive the positioning plate to move along the slide rail.

[0020] Preferably, the linear drive assembly is a telescopic cylinder or a ball screw drive pair driven by a motor.

[0021] Preferably, the reference edge positioning device includes:

[0022] Fixing plate;

[0023] Movable panels are set parallel to and spaced apart from the fixed panels;

[0024] Guide posts are multiple posts spaced apart along the length of the movable plate. One end of the guide post is fixedly connected to one of the fixed plate and the movable plate, and is movably connected to the other.

[0025] The adjusting bolt is installed on the fixed plate. The adjusting bolt is threadedly connected to the fixed plate and rotatably connected to the movable plate.

[0026] Preferably, the movable flat worktable includes:

[0027] The travel track consists of two parallel, spaced-apart tracks.

[0028] There are two moving trolleys, each traveling along a separate track.

[0029] A horizontal worktable is installed between two traveling trolleys; the two traveling trolleys drive the horizontal worktable along the traveling track away from or towards the fixed flat worktable.

[0030] Preferably, a rack is installed on one side of the traveling track, and the traveling trolley includes:

[0031] Walking beam;

[0032] There are two traveling wheels, which are installed at both ends of the traveling beam.

[0033] The drive motor is mounted on the traveling beam, and the output end of the drive motor is equipped with a drive gear that meshes with the rack.

[0034] Preferably, the side-mounted worktable, the fixed flat-mounted worktable, and the movable flat-mounted worktable all have multiple mounting holes arranged in an array on their surfaces for mounting the clamping device; the clamping device includes:

[0035] The pressure plate has elongated adjustment holes on its surface;

[0036] Tighten the bolts, pass them through the elongated adjustment holes, and then connect them with the corresponding mounting holes on the side-mounted worktable, fixed flat worktable, or movable flat worktable via threaded connections.

[0037] The adjusting bolt is threaded to one end of the pressure plate and passes through the pressure plate.

[0038] Preferably, in step S1, one of the holes on one side of the reference edge of the flange plate is reamed, and this hole is selected as the reference hole.

[0039] By employing the technical solution described above, the present invention has the following beneficial effects:

[0040] (1) This invention, by pre-assembling paired flange plates firmly and then performing overlapping drilling and integrated milling of the reference edge, and maintaining the assembled state throughout the process, fundamentally ensures the high consistency of the concentricity of the hole positions of the paired flanges and the shape and position accuracy of the reference edge. The reference hole formed by the H7 grade tolerance reaming is precisely matched with the positioning mechanism. Combined with the non-separable process constraints, it eliminates the cumulative error of single-piece processing, allowing bolts to be directly and smoothly inserted during on-site assembly, realizing "zero repair" docking, and significantly improving the connection reliability and installation efficiency.

[0041] (2) The assembly process of this invention relies on a dedicated workbench system and adopts dual constraints of reference holes and reference edges to achieve rapid and accurate flange positioning, greatly reducing repeated manual adjustments. When assembling the main beam flange, the self-weight deflection is realistically simulated by horizontal hoisting, and a reasonable pre-camber is preset to ensure that the connection surface fits naturally during on-site installation and effectively avoids additional stress. After spot welding positioning, it is transferred to a dedicated work station for full welding, which not only protects the reference surface of the workbench from the influence of thermal deformation, but also provides sufficient operating space to ensure the weld formation quality and structural strength.

[0042] (3) The adjusting positioning mechanism of this invention integrates a sliding rail guide, a linear drive component, and a guide column constraint movable clamping structure to achieve servo-precise control of the flange spacing and stable contact with the reference edge. The "one hole, one side" positioning mode, combined with the clamping mechanism locking, significantly improves the repeatability of positioning accuracy and adjustment efficiency, and avoids manual measurement errors. The movable flat worktable adopts a gear and rack transmission and grooved walking wheel guide design to achieve digital adjustment of the span parameter, adjustable meshing clearance, and smooth operation, enhancing the equipment's adaptability to main beams of different specifications and production flexibility.

[0043] (4) The clamping device of the present invention adopts a combination of a pressure plate with a long strip-shaped adjustment hole and an adjustment bolt with a spherical washer, which can flexibly adapt to flanges of different sizes and thicknesses, ensure uniform distribution of clamping force and stable clamping, effectively prevent flange displacement during assembly, and further improve positioning reliability.

[0044] (5) The present invention moves the core positioning and pre-assembly process to the workshop controllable environment, systematically avoids the risks of high-altitude operation and environmental interference on site, significantly improves the accuracy and consistency of gantry crane flange assembly, construction safety and overall assembly efficiency, and provides reliable process support for the high-quality manufacturing of large steel structure equipment. Attached Figure Description

[0045] Figure 1 A three-dimensional structural diagram of the side-mounted worktable;

[0046] Figure 2 This is a schematic diagram of the side-mounted worktable.

[0047] Figure 3 A schematic diagram of the structure for assembling the support flange;

[0048] Figure 4 A three-dimensional structural diagram of a fixed flat-mounted worktable;

[0049] Figure 5 A three-dimensional structural diagram of a movable flat-mounted worktable;

[0050] Figure 6 This is a 3D structural diagram of the walking cart;

[0051] Figure 7 A structural schematic diagram of the main beam flange assembly;

[0052] Figure 8 A three-dimensional structural diagram of the hole position adjustment and positioning device;

[0053] Figure 9 A three-dimensional structural diagram of the reference edge positioning device;

[0054] Figure 10 This is a three-dimensional structural diagram of the clamping device.

[0055] In the diagram: 1. Side-mounted worktable; 2. Fixed flat-mounted worktable; 3. Movable flat-mounted worktable; 3-1. Traveling track; 3-2. Horizontal worktable; 3-3. Rack; 3-4. Traveling beam; 3-5. Traveling wheels; 3-6. Drive motor; 4. Clamping device; 4-1. Pressure plate; 4-2. Clamping bolt; 4-3. Adjusting bolt; 5. Hole position adjustment and positioning device; 5-1. Fixed base; 5-2. Slide rail; 5-3. Positioning plate; 5-4. Positioning pin; 5-5. Linear drive assembly; 6. Reference edge positioning device; 6-1. Fixed plate; 6-2. Movable plate; 6-3. Guide column; 6-4. Adjusting bolt. Detailed Implementation

[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0057] In the description of this invention, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0058] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0059] Example 1:

[0060] Combined with appendix Figures 1-5 7-9, A method for assembling flanges for a gantry crane, comprising the following steps:

[0061] S1. Fabricate flanges: Align the edges of two flange plates and assemble them securely together. The two flange plates in the same set are the support flange plate and the main beam flange plate. After assembly, drill holes and smooth the reference edge. Select one hole and reference edge as the positioning reference for subsequent assembly operations, and fabricate four sets. Use overlapping drilling technology for hole drilling to ensure the concentricity of corresponding holes on the two flange plates. Use milling technology to smooth the reference edge to ensure the straightness and flatness of the reference edge. The pre-set positioning reference provides a precise reference point for the subsequent assembly of the support flange and the main beam flange, avoiding repeated marking and multiple measurements, significantly improving assembly efficiency and consistency.

[0062] Furthermore, in step S1, one of the holes on one side of the flange plate's reference edge is reamed, and this hole is selected as the reference hole. The reaming is controlled with H7 tolerance to form a high-precision mating surface. This reference hole forms a precise mating relationship with the subsequent locating pin, effectively eliminating the cumulative error of single-piece flange machining and ensuring the repeatability and reliability of positioning during assembly.

[0063] It is important to note that the two assembled flanges should not be separated before the reference edge is flattened on the flange edge to avoid misalignment between the reference edge and the hole on the two flanges.

[0064] S2. Fabricate the outrigger components; assemble and fix the two outriggers of the crane to the ground beam by welding or high-strength bolts to form outrigger components, fabricating two sets; verify the assembly accuracy of the outriggers and ground beam before welding. The two sets of outrigger components are installed at both ends of the gantry crane; pre-assembly of the components is completed in the workshop, which can make full use of fixed tooling and testing equipment to control dimensional and positional tolerances, reduce the amount of on-site high-altitude work, and improve structural stability and construction safety.

[0065] S3, Leg flange assembly, as shown in the attached document. Figure 3 As shown, two support flanges are mounted on the vertical surface of the side-mounted workbench 1 according to their respective positioning references. The distance between the two support flanges is adjusted according to the design dimensions, and this distance must be consistent with the distance between the two legs in the support component. A set of support components is hoisted, aligning the center lines of symmetry of the two legs with the center lines of symmetry of the two support flanges on the side-mounted workbench 1. The legs are then spot-welded to the corresponding support flanges. The assembly operation of the two sets of support components and support flanges is completed in sequence. This positioning method, through the dual constraints of reference holes and reference edges, quickly defines the position in the flange plane, reduces the frequency of manual adjustment, and improves the assembly accuracy and efficiency. It should be noted that after the two support flanges of the same support component are spot-welded, the support flanges can be separated from the side-mounted workbench 1. Then, the support flanges and corresponding legs are fully welded to each other at a dedicated welding station. Welding after separating the workbench avoids thermal deformation affecting the accuracy of the workbench, while providing sufficient operating space and ensuring weld quality and structural strength.

[0066] S4. Main beam flange assembly, as shown in the attached document. Figure 7As shown, two main beam flanges are installed on the horizontal platform of the fixed flat workbench 2 according to their respective positioning references. The spacing between the two main beam flanges is adjusted according to the design dimensions. The other two main beam flanges are then installed on the horizontal platform of the movable flat workbench 3 according to their respective positioning references, ensuring that the spacing between the two main beam flanges on the movable flat workbench 3 is consistent with the spacing between the two main beam flanges on the fixed flat workbench 2. The spacing between the fixed flat workbench 2 and the movable flat workbench 3 is adjusted according to the design dimensions. The main beam is then horizontally hoisted to the top of the four main beam flanges, and the main beam flanges are spot-welded to the main beam. The horizontal hoisting process simulates the static deflection of the main beam under its own weight, allowing for a reasonable pre-camber during flange assembly, ensuring smooth contact of the connection surfaces during on-site installation. After the flanges are assembled, the outrigger components and main beam are transported to the crane installation site for final assembly. It is worth noting that when assembling the outrigger components and main beam, the two flanges that are connected to the outrigger components and main beam must be the same set of flanges that were paired and machined in step S1. Because the drilling and reference machining ensure the interchangeability of the hole position and the reference edge, the bolts can be directly inserted, avoiding on-site hole repair or forced assembly, thus improving the connection reliability and installation efficiency.

[0067] It is worth noting that the reason for horizontally hoisting the main beam to the top of the four main beam flanges for assembly is to pre-adapt to the deformation caused by the main beam's own weight, and to ensure that the subsequent on-site assembly of the gantry crane can proceed smoothly.

[0068] It should be noted that there is no strict order between steps S3 and S4. If the space allows, steps S3 and S4 can be performed simultaneously.

[0069] As attached Figure 1 , 2 As shown in Figures 4 and 5, two sets of adjustment and positioning devices are symmetrically installed on the side-mounted worktable 1, the fixed flat-mounted worktable 2, and the movable flat-mounted worktable 3; the side-mounted worktable 1 and the fixed flat-mounted worktable 2 are provided with clamping devices 4 for clamping the flange plates on the table surface corresponding to the adjustment and positioning devices.

[0070] The adjustment and positioning device includes a hole position adjustment and positioning device 5 installed inside the side-mounted workbench 1, the fixed flat-mounted workbench 2, and the movable flat-mounted workbench 3, and a reference edge positioning device 6 installed on their respective workbench surfaces; the hole position adjustment and positioning device 5 and the corresponding reference edge positioning device 6 are used together to quickly position the flange; the hole position adjustment and positioning device 5 is used to adjust the distance between two flanges on the same workbench surface, and after the distance is adjusted to the correct position, the corresponding flange is pressed and fixed by the clamping device 4.

[0071] Specifically, as shown in the attached document Figure 8As shown, the hole position adjustment and positioning device 5 includes a fixed base 5-1, a slide rail 5-2, a positioning plate 5-3, and a positioning pin 5-4. The fixed base 5-1 serves as the mounting base; two slide rails 5-2 are installed parallel to each other on the fixed base 5-1; the positioning plate 5-3 is slidably connected to the slide rails 5-2 via a slider; the positioning pin 5-4 is installed on the positioning plate 5-3, and the positioning pin 5-4 corresponds to and is adapted to the selected reference hole position on the flange plate. Simultaneously, the surfaces of the side-mounted worktable 1, the fixed flat-mounted worktable 2, and the movable flat-mounted worktable 3 all have slotted holes through which the positioning pin 5-4 can pass. The longitudinal axis of the slotted hole is parallel to the longitudinal axis of the slide rail 5-2; the positioning pin 5-4 passing through the slotted hole can mate with the reference hole of the corresponding flange; the surface of the positioning pin 5-4 is hardened to form a small clearance fit with the reference hole; the slotted hole structure allows the positioning pin to move freely within the adjustment stroke, effectively limiting flange displacement after positioning and improving positioning repeatability.

[0072] A linear drive assembly 5-5 is mounted on a fixed base 5-1. The moving part of the linear drive assembly 5-5 is connected to the positioning plate 5-3 via a bracket. It drives the positioning plate 5-3 to move along the slide rail 5-2, causing the positioning pin 5-4 to move along the corresponding slot. The positioning pin 5-4 then moves the corresponding flange, thereby achieving automatic and precise adjustment of the distance between the two flanges on the respective surfaces of the side-mounted worktable 1, the fixed flat-mounted worktable 2, and the movable flat-mounted worktable 3. The linear drive assembly 5-5 employs servo control, combined with a position feedback element, to achieve precise adjustment, avoiding errors introduced by repeated manual measurement and adjustment, and significantly improving adjustment efficiency and consistency. Depending on the requirements, the linear drive assembly 5-5 can be a telescopic cylinder or a ball screw drive pair driven by a motor; both are characterized by compact structure and stable response, adapting to different precision requirements.

[0073] As attached Figure 9 As shown, the reference edge positioning device 6 includes a fixed plate 6-1, a movable plate 6-2, a guide post 6-3, and an adjusting bolt 6-4. The fixed plate 6-1 can be fixedly installed on the flange fixing surface of the side-mounted worktable 1, the fixed flat-mounted worktable 2, and the movable flat-mounted worktable 3, respectively.

[0074] The movable plate 6-2 and the fixed plate 6-1 are arranged parallel to each other at intervals. It should be noted that the flange fixing surface of the side-mounted workbench 1 is a vertical plane, so the movable plate 6-2 is located above the fixed plate 6-1; the flange fixing surfaces of the fixed flat workbench 2 and the movable flat workbench 3 are horizontal planes, so the movable plate 6-2 is located on the side of the fixed plate 6-1 corresponding to the positioning pin 5-4.

[0075] Multiple guide posts 6-3 are spaced apart along the length of the movable plate 6-2. One end of each guide post 6-3 is fixedly connected to the fixed plate 6-1 and slides in contact with a guide hole on the movable plate 6-2. The surface of the guide posts 6-3 is chrome-plated to reduce frictional resistance. This structure ensures that the movable plate 6-2 moves along a straight and stable trajectory, preventing deflection and improving the reliability of the reference edge positioning. Adjusting bolts 6-4 are installed on the fixed plate 6-1, threadedly connected to the fixed plate 6-1, and rotatably connected to the movable plate 6-2. By turning the adjusting bolts 6-4, the movable plate 6-2 can be moved, making it contact the reference edge of the corresponding flange. That is, the flange can be quickly positioned using a reference hole and a reference edge. After adjusting the spacing between two flanges on the same platform, subsequent assembly operations can be performed.

[0076] In use, the positioning and assembly of the support flange and support components are first completed on the side-mounted workbench 1, and the positioning and assembly of the main beam flange and main beam are completed on the fixed flat-mounted workbench 2 and the movable flat-mounted workbench 3. During the assembly process, the hole position adjustment positioning device 5 and the reference edge positioning device 6 work together to achieve rapid and accurate positioning of the flange. After the clamping device 4 locks the flange, spot welding is performed. After the assembled parts are transported to the site, the flanges are connected according to the pairing relationship in step S1, and the bolts are successfully inserted to complete the installation. This method moves the key positioning process to a controllable environment in the workshop, effectively avoiding the influence of complex on-site working conditions and improving the overall assembly quality and construction efficiency.

[0077] Example 2:

[0078] Combined with appendix Figures 5-6 A method for assembling flanges for a gantry crane, which differs from Embodiment 1 in that, based on Embodiment 1, as shown in the appendix... Figure 5 As shown, the movable flat workbench 3 includes a traveling track 3-1, a traveling trolley, and a horizontal workbench 3-2. Two traveling tracks 3-1 are arranged in parallel at intervals; the traveling tracks 3-1 are installed on the workshop floor. A traveling trolley is mounted on each of the two traveling tracks 3-1; the horizontal workbench 3-2 is installed between the two traveling trolleys; the two traveling trolleys drive the horizontal workbench 3-2 along the traveling tracks 3-1, moving it away from or closer to the fixed flat workbench 2, thus adjusting the distance between the movable flat workbench 3 and the fixed flat workbench 2.

[0079] Furthermore, a rack 3-3 is installed on one side of the traveling track 3-1; as shown in the attached diagram. Figure 6As shown, the traveling trolley includes a traveling beam 3-4, traveling wheels 3-5, and a drive motor 3-6. Traveling wheels 3-5 are installed at both ends of the traveling beam 3-4. The traveling wheels 3-5 are grooved wheels, and their rims form a guiding constraint with the side of the track. This structure effectively suppresses lateral movement and derailment risks during travel, ensuring the smooth movement of the workbench and operational safety. The drive motor 3-6 is installed on the traveling beam 3-4. A drive gear corresponding to the rack 3-3 is installed at the output end of the drive motor 3-6. The rack and pinion pair is precision-machined, with adjustable meshing clearance and high transmission rigidity, ensuring accurate positioning of the movable flat workbench 3 and meeting the high-precision span requirements during main beam flange assembly. The rack 3-3 and the drive gear form a precise transmission pair, enabling digital adjustment of the span parameters, adapting to the assembly needs of main beams of different specifications of gantry cranes, avoiding tooling changes, and improving equipment versatility and production flexibility.

[0080] Example 3:

[0081] Combined with appendix Figure 1 , 2 4, 5, and 10, a method for assembling flanges of a gantry crane, based on embodiment one or two, wherein the side-mounted worktable 1, the fixed flat-mounted worktable 2, and the movable flat-mounted worktable 3 all have multiple mounting holes arranged in an array on their surfaces for installing clamping devices 4. (See attached...) Figure 10 As shown, the clamping device 4 includes a pressure plate 4-1, a clamping bolt 4-2, and an adjusting bolt 4-3. The pressure plate 4-1 has an elongated structure with an elongated adjusting hole on its surface. The clamping bolt 4-2 passes through the elongated adjusting hole and is threadedly connected to the corresponding mounting hole on the side-mounted worktable 1, the fixed flat worktable 2, or the movable flat worktable 3. The elongated adjusting hole provides position adjustment margin to accommodate the clamping point arrangement of flanges of different sizes. The clamping bolt 4-2 is a standard high-strength bolt, which provides a stable clamping force after tightening to prevent displacement of the flange during assembly.

[0082] Furthermore, the end of the pressure plate 4-1 away from the center of the flange is threaded with an adjusting bolt 4-3, and the adjusting bolt 4-3 passes through the pressure plate 4-1. A spherical washer is provided at the end of the adjusting bolt 4-3. By rotating the adjusting bolt 4-3, its extension length can be adjusted to compensate for the thickness difference of flanges of different specifications, so that the pressure plate 4-1 applies force evenly and enhances the adaptability and reliability of the clamping.

[0083] The parts of this invention not described in detail are prior art. It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to encompass all changes falling within the meaning and scope of equivalents within this invention.

Claims

1. A method for assembling flanges of a gantry crane, characterized in that, Includes the following steps: S1. Fabricate flanges. Align the edges of two flange plates and assemble them firmly together. The two flange plates in the same group are the support flange plate and the main beam flange plate, respectively. After assembly, drill holes and flatten the reference edge. Select one of the holes and the reference edge as the positioning reference for subsequent assembly operations. Fabricate four groups. S2. Fabricate outrigger components; Assemble and fix the two outriggers of the crane to the ground beam assembly to form outrigger components, and fabricate two sets; S3. Assemble the support flanges. Take two support flanges and install them on the vertical table of the side-mounted workbench (1) according to their respective positioning references. Adjust the distance between the two support flanges according to the design dimensions. Hoist a set of support components so that the symmetrical center lines of the two support legs are aligned with the symmetrical center lines of the two support flanges on the side-mounted workbench (1). Spot weld the support legs to the corresponding support flanges. Complete the assembly operation of the two sets of support components and support flanges in sequence. S4. Assemble the main beam flanges. Take two main beam flanges and install them on the horizontal platform of the fixed flat workbench (2) according to their respective positioning references. Adjust the distance between the two main beam flanges according to the design dimensions. Install the other two main beam flanges on the horizontal platform of the movable flat workbench (3) according to their respective positioning references. Make the distance between the two main beam flanges on the movable flat workbench (3) consistent with the distance between the two main beam flanges on the fixed flat workbench (2). Adjust the distance between the fixed flat workbench (2) and the movable flat workbench (3) according to the design dimensions. Hoist the main beam to the top of the four main beam flanges and spot weld the main beam flanges to the main beam.

2. The method for assembling flanges of a gantry crane as described in claim 1, characterized in that, Two sets of adjustment and positioning devices are symmetrically installed on the side-mounted worktable (1), the fixed flat-mounted worktable (2), and the movable flat-mounted worktable (3); the side-mounted worktable (1) and the fixed flat-mounted worktable (2) are provided with clamping devices (4) for clamping flange plates on the table surface corresponding to the adjustment and positioning devices; the adjustment and positioning devices include hole position adjustment and positioning devices (5) installed inside the side-mounted worktable (1), the fixed flat-mounted worktable (2), and the movable flat-mounted worktable (3) and reference edge positioning devices (6) installed on their respective table surfaces.

3. The method for assembling flanges of a gantry crane as described in claim 2, characterized in that, The hole position adjustment and positioning device (5) includes: Fixed base (5-1); The slide rails (5-2) are two parallel and spaced-apart rails, which are mounted on the fixed base (5-1); The positioning plate (5-3) is slidably connected to the slide rail (5-2) via a slider; The positioning pin (5-4) is installed on the positioning plate (5-3), and the positioning pin (5-4) can be matched with the selected reference hole on the flange plate; the table surfaces of the side-mounted worktable (1), the fixed flat worktable (2) and the movable flat worktable (3) are all provided with strip holes that allow the positioning pin (5-4) to pass through, and the length axis of the strip hole is parallel to the length axis of the slide rail (5-2); A linear drive assembly (5-5) is mounted on a fixed base (5-1). The moving part of the linear drive assembly (5-5) is connected to the positioning plate (5-3) via a bracket and is used to drive the positioning plate (5-3) to move along the slide rail (5-2).

4. The method for assembling flanges of a gantry crane as described in claim 3, characterized in that, The linear drive assembly (5-5) is a telescopic cylinder or a ball screw drive pair driven by a motor.

5. The method for assembling flanges of a gantry crane as described in claim 2, characterized in that, The reference edge positioning device (6) includes: Fixing plate (6-1); The movable plate (6-2) is set parallel to and spaced apart from the fixed plate (6-1); Guide posts (6-3) are arranged at intervals along the length of the movable plate (6-2). One end of the guide post (6-3) is fixedly connected to one of the fixed plate (6-1) and the movable plate (6-2), and is movably inserted into the other. Adjusting bolt (6-4) is installed on fixed plate (6-1). Adjusting bolt (6-4) is threadedly connected to fixed plate (6-1) and rotatably connected to movable plate (6-2).

6. The method for assembling flanges of a gantry crane as described in claim 1 or 2, characterized in that, The movable flat worktable (3) includes: The walking track (3-1) consists of two parallel, spaced-apart tracks. There are two traveling trolleys, each traveling in coordination with one of the two traveling tracks (3-1); A horizontal worktable (3-2) is installed between two traveling trolleys; the two traveling trolleys drive the horizontal worktable (3-2) along the traveling track (3-1) away from or close to the fixed flat worktable (2).

7. The method for assembling flanges of a gantry crane as described in claim 6, characterized in that, A rack (3-3) is installed on one side of the traveling track (3-1), and the traveling trolley includes: Walking beam (3-4); There are two traveling wheels (3-5), which are installed at both ends of the traveling beam (3-4); The drive motor (3-6) is mounted on the traveling beam (3-4), and the output end of the drive motor (3-6) is equipped with a drive gear that meshes with the rack (3-3).

8. The method for assembling flanges of a gantry crane as described in claim 2, characterized in that, The side-mounted worktable (1), the fixed flat-mounted worktable (2), and the movable flat-mounted worktable (3) all have multiple mounting holes arranged in an array on their surfaces for mounting the clamping device (4); the clamping device (4) includes: The pressure plate (4-1) has elongated adjustment holes on its surface; The clamping bolt (4-2) passes through the elongated adjustment hole and is threaded to the corresponding mounting hole on the side-mounted worktable (1), fixed flat worktable (2) or movable flat worktable (3). The adjusting bolt (4-3) is threaded to one end of the pressure plate (4-1) and passes through the pressure plate (4-1).

9. The method for assembling flanges of a gantry crane as described in claim 1, characterized in that, In step S1, one of the holes on the reference edge of the flange plate is reamed, and this hole is selected as the reference hole.

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