Folding gantry crane and mounting process thereof

Abstract

The invention relates to the technical field of gantry crane installation, in particular to a folding gantry crane which comprises a portal frame and supporting legs, the portal frame comprises a main beam and an end cross beam, one end of each supporting leg is hinged to the main beam through a pin shaft, the lower side of the main beam is provided with a joint device corresponding to the supporting leg, and the other end of each supporting leg is provided with a tail sliding roller. A walking beam cart is arranged on the lower side of the portal frame, the walking beam cart comprises a main trolley, a driven trolley and a lower cross beam, mounting seats matched with the supporting legs are arranged on the upper side of the lower cross beam, and a portal crane trolley is arranged on the upper side of the portal frame; the supporting legs of the gantry crane can be folded, the gantry crane is suitable for being used in a factory building or other limited installation environments, the lifting height needed by installation is reduced, the gantry is stably lifted through the two 130 t truck cranes, the supporting legs are lifted vertically, installation is conducted stably and reliably, and the installation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gantry crane installation, and in particular to a foldable gantry crane and an installation process thereof. Background Art

[0002] Gantry crane is a kind of lifting equipment, mainly composed of gantry, trolley, car, lifting mechanism, walking structure, etc. The main crossbeam of the gantry and the columns at both ends form the shape of a door, commonly known as gantry crane. The equipment is installed in the workshop with a compact construction space. The main beam and outriggers are used for overall lifting. The assembly and placement of the equipment have strict requirements and the lifting is difficult. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a foldable gantry crane and its installation process.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A folding gantry crane comprises a gantry and a leg, the gantry comprises a main beam and an end cross beam, one end of the leg is hinged to the main beam by a pin shaft, a coupling device corresponding to the leg is provided on the lower side of the main beam, a tail roller is provided on the other end of the leg, a running beam trolley is provided on the lower side of the gantry, the running beam trolley comprises a main trolley, a passive trolley and a lower cross beam, a mounting seat adapted to the leg is provided on the upper side of the lower cross beam, and a gantry crane trolley is provided on the upper side of the gantry.

[0005] A folding gantry crane installation process, the installation steps comprising: S1. Before hoisting with a crane, place the main beam, outriggers, lower beam, trolley, gantry crane trolley and electrical equipment close to the set installation position according to the hoisting plan to avoid secondary handling; S2. Assemble components on the ground, inspect before installation, clean the work site, and inspect all components of the gantry crane; assemble all components of the gantry crane, including the traveling beam trolley, main beam bridge frame, and outriggers; S3. The main beam and outriggers are hoisted as a whole. After the main beam and outriggers are assembled, two 130t truck cranes are used to lift the equipment. The tail rollers at the lower end of the outriggers slide on the track, and the joint device temporarily fixes the main beam and the outriggers. S4. After the traveling beam trolley is assembled, the 25t truck crane moves the traveling beam trolley to the bottom of the outrigger. When the lower crossbeam flange approaches the lower flange of the outrigger, the 25t truck crane is directed to slowly drop the hook and support the fixed diagonal brace of the traveling beam trolley. S5, the connection between the outriggers and the traveling beam trolley. Before lifting, remove the tail rollers under the four outriggers and prepare to drop the beam into place; The 130t truck crane slowly drops the hook, the outrigger is inserted into the mounting seat, the lower crossbeam is aligned with the lower flange of the outrigger, the bolts are inserted and tightened, the bolt holes on the upper flange of the outrigger are aligned with the main beam, the bolts are inserted and tightened; S6. Hoisting of the gantry crane trolley: The 130t truck crane slowly lifts the gantry crane trolley. When the bottom height of the gantry crane trolley wheel exceeds the main beam railing elevation by 500mm, the lifting stops. The 130t truck crane slowly rotates the boom to straighten the gantry crane trolley, places the gantry crane trolley on the track, and fixes the wheels. S7. Ancillary facilities and electrical equipment shall be positioned and installed according to the drawings. Maintenance platforms and ladder railings shall be installed one by one, and their installation quality shall be checked to see if it meets the requirements of the drawings; Crane post-installation commissioning and load test: After the mechanical and electrical installation is basically completed, mechanical and electrical commissioning shall be carried out; S8. Special equipment shall be inspected, filed and registered for use and put into use after passing the inspection.

[0006] Preferably, in step S2, the assembly of the traveling beam trolley: a. Select the assembly site and draw the positioning line on the ground; b. When assembling the running beam trolley, place the main trolley and the passive trolley according to the base distance of the running beam trolley and fix them with diagonal braces. Use a 25t truck crane to lift the lower crossbeam with the corresponding mark to the top of the trolley. After the hinge seat holes are aligned, insert the pin shaft, install the cotter pin, and assemble them into a whole.

[0007] Preferably, in step S2, the main beam bridge is assembled: A1. Assemble the two rows of main beams on the lower crossbeam of the traveling beam trolley according to the section marks, and tighten the main beam connecting bolts; install the end crossbeam between the two rows of main beams, and the installer will check the dimensions according to the drawing requirements, and tighten the connecting bolts after confirming that the assembly is correct; after installation, install the accessories, and leave a position for hanging the wire rope for hoisting, and take protective measures for the wire rope at the sling; A2. After the upper bridge of the gantry crane is assembled, the installer will check the dimensions according to the drawing requirements. After confirming that the assembly is correct, the inspection record will be confirmed and filed by the installation team leader.

[0008] Preferably, in step S2, the assembly of the legs: B1. Use a 25t truck crane to lift the outrigger to the outside of the main beam, insert the pin shaft after the hinge pin hole is aligned, install the split pin, and assemble the whole; B2. Install the tail roller 21 on the lower flange of the leg by bolts; B3. Repeat the above steps to complete the connection between the remaining legs and the main beam.

[0009] Preferably, in step S3, the main beam and the legs are hoisted as a whole: The 130t truck lifting hook makes the lifting wire rope slightly stressed, the tail roller at the lower end of the outrigger contacts the track, the hook wire rope remains vertical, and then slowly lifts the hook. When the lower end of the outrigger exceeds the flange surface of the lower beam by 1m, the lifting stops.

[0010] Preferably, in step S7, the electrical system installation method is: The whole equipment is connected into a whole, and the track clamps are clamped, the guy ropes are hung, and then the electrical system is installed; Install the electrical system according to the electrical schematic, wiring diagram, electrical master plan and related technical documents; before installation, check whether all electrical components are in good condition and whether the installation method and location comply with relevant regulations; the installation of the electrical system shall be carried out according to the electrical design drawing of the equipment; After the electrical construction is completed, debugging is carried out to ensure that all walking and lifting mechanisms can work normally and the protective devices can be put into operation in time.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. The gantry crane of the present invention has foldable legs, which is suitable for installation in factory buildings or other restricted environments. It reduces the lifting height required for installation. The gantry is stably lifted by two 130t truck cranes, and the legs are suspended upright, so that the installation can be carried out stably and reliably, thereby improving the installation efficiency. 2 The present invention standardizes and concretizes the gantry crane installation process, strictly regulates the placement and use requirements of tools and workpieces, ensures the reliability and safety of the gantry crane installation, and at the same time ensures the gantry crane installation quality and ensures production safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the installation process of a foldable gantry crane proposed by the present invention; Figure 2 This is a left-side structural schematic diagram of a foldable gantry crane proposed by the present invention in a state ready for installation; Figure 3 This is a schematic diagram of the main structure of a foldable gantry crane proposed by the present invention in a state ready for installation; Figure 4 A schematic diagram of the structure of a foldable gantry crane proposed by the present invention in a top view in a state to be installed; Figure 5 A schematic diagram of the support leg structure of a foldable gantry crane proposed by the present invention; Figure 6 A schematic diagram of the main beam and legs being hoisted as a whole in the beginning state of the installation process of a folding gantry crane proposed by the present invention; Figure 7 A schematic diagram of the overall hanging process of the main beam and the legs of a folding gantry crane in the installation process of the present invention; Figure 8A schematic diagram of the overall erection result state of the main beam and the outriggers of the installation process of the folding gantry crane proposed by the present invention; Fig. 9 A schematic diagram of the positioning process of the traveling beam trolley in the installation process of the folding gantry crane proposed by the present invention; Fig.10 A schematic diagram of the connection process between the outriggers and the traveling beam trolley of the installation process of a folding gantry crane proposed by the present invention; Fig.11 A schematic diagram of the gantry crane trolley hoisting start state of the installation process of the folding gantry crane proposed by the present invention; Fig.12 A schematic diagram of the gantry crane trolley hoisting completion state of the installation process of the folding gantry crane proposed by the present invention; Fig.13 A schematic diagram of the dismantling process of a foldable gantry crane proposed in the present invention.

[0013] In the figure: 1. gantry; 11. main beam; 12. end cross beam; 2. outrigger; 21. tail roller; 22. pin shaft; 3. traveling beam trolley; 4. 130t truck crane; 41. boom; 5. gantry crane trolley; 6. 25t truck crane. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] Reference Figure 2-5 A folding gantry crane comprises a gantry 1 and a leg 2. The gantry 1 comprises a main beam 11 and an end cross beam 12. One end of the leg 2 is hinged to the main beam 11 through a pin shaft 22. A coupling device corresponding to the leg 2 is provided on the lower side of the main beam 11. A tail roller 21 is provided on the other end of the leg 2. A running beam trolley 3, i.e., a trolley, is provided on the lower side of the gantry 1. The running beam trolley 3 comprises a main trolley, a passive trolley and a lower cross beam. The main trolley and the passive trolley are respectively arranged on the lower sides of both ends of the lower cross beam. Both the main trolley and the passive trolley are trolleys. A mounting seat adapted to the leg 2 is provided on the upper side of the lower cross beam. A gantry crane trolley 5, i.e., a trolley, is provided on the upper side of the gantry 1. A track corresponding to the gantry crane trolley 5 is provided on the gantry 1.

[0016] like Figure 1 As shown, the installation steps of the folding gantry crane include: Step S1, before crane hoisting, plane layout is carried out. According to the actual situation of the track measured before installation, a line perpendicular to the track is drawn on the trolley track at the set installation position with the help of a theodolite, and then the layout lines of each wheel are drawn respectively based on the vertical line, and permanent marks are made, and the placement positions of each component are drawn respectively based on the vertical line; After being assembled by the manufacturer, the gantry crane is disassembled and transported to the installation site. The main beam 11, outriggers 2, lower cross beams, trolleys, gantry crane trolleys 5, electrical equipment and other components are placed in appropriate positions according to the site conditions. When placing the components, they are as close to the set installation position as possible according to the lifting plan to avoid secondary handling. At the same time, two 130t truck cranes 4 and one 25t truck crane 6 are configured; Step S2, assembling components on the ground, inspecting before installation, cleaning the work site, inspecting the components of the gantry crane, confirming that all components are complete and intact, and then measuring the plane distance of the construction site; The gantry crane components are assembled. Before installation, the 25t truck crane is used to assemble the gantry crane components. After the assembly is completed, the gantry crane components are hoisted to the installation location; Assemble the traveling beam trolley 3, the main beam 11 bridge frame, and the outrigger 2; Assembly of traveling beam trolley 3: a. Select the assembly site and draw the positioning line on the ground; b. When assembling the traveling beam trolley 3, place the main trolley and the passive trolley according to the trolley base distance and fix them with diagonal braces. Use a 25t truck crane 6 to lift the corresponding marked lower crossbeam to the top of the trolley. After the hinge seat holes are aligned, insert the pin shaft, install the split pin, and assemble them into a whole. Assembly of main beam 11 bridge: A1. Assemble the two rows of main beams 11 on the lower crossbeam of the traveling beam trolley 3 in sequence according to the section marks, and tighten the connecting bolts of the main beams 11; install the end crossbeam 12 between the two rows of main beams 11, and the installer shall check the dimensions according to the requirements of the drawing, and tighten the connecting bolts after confirming that the assembly is correct; to ensure the safety of the installers working at high altitude, assemble the main beam 11 sliding wire, railings and end beam railings on the ground; after installation, install the accessories, leave a position for hanging the wire rope for hoisting, and take protective measures for the wire rope at the sling; A2. After the upper bridge of the gantry crane is assembled, the installer will check the dimensions according to the drawing requirements. After confirming that the assembly is correct, the inspection record will be confirmed and filed by the installation team leader; Assembly of Leg 2: B1. Use a truck crane to lift the outrigger 2 to the outside of the main beam 11, insert the pin 22 after the hinge pin hole is turned over and aligned, install the split pin, and assemble the whole; B2. Install the tail roller 21 on the lower flange of the leg 2 by bolts; B3. Repeat the above steps to complete the connection between the remaining legs 2 and the main beam 11.

[0017] Step S3, the main beam 11 and the outrigger 2 are hoisted as a whole. After the main beam 11 and the outrigger 2 are assembled, 4 wire ropes with a diameter of 6×29-34-1770 and a length of 4m are selected. Each wire rope has 1 bend and 2 strands, a total of 8 strands are subjected to force. The wire ropes are fixed to the upper lifting ears of the end cross beams 12 on both sides with S-DX9.5 shackles; two 130t truck cranes 4 are used for lifting equipment. The tail roller 21 at the lower end of the outrigger 2 slides on the track. The main beam 11 and the outrigger 2 are temporarily fixed by a joint device. The joint device uses an electromagnet or a buckle. After contact, it is temporarily adsorbed and fixed to avoid shaking, which affects the docking installation accuracy and improves safety; like Figure 6 , Figure 7 , Figure 8 As shown, the main beam 11 and the legs 2 are hoisted as a whole: Two 130t truck lifting hooks make the lifting wire rope slightly stressed, the tail roller 21 at the lower end of the leg 2 contacts the track, the hook wire rope remains vertical, and then the hook is slowly lifted. When the lower end of the leg 2 exceeds the flange surface of the lower beam by 1m, the lifting is stopped.

[0018] Step S4, hoisting the traveling beam trolley 3. After the traveling beam trolley 3 is assembled, 2 wire ropes of 6×29-20-1770 in diameter and 4 m in length are selected. Each wire rope has 1 bend and 2 strands, a total of 4 strands are stressed. The wire ropes are fixed to the lower beam lifting ears with S-DX4.75 shackles; a 25t truck crane 6 is used as the hoisting equipment; like Fig. 9 As shown, the method of hoisting the trolley into place: a. Before lifting, position a 25t truck crane 6 according to the set position; b. 25t truck lifting hook, make the hoisting wire rope slightly stressed, remove the fixed diagonal brace, and keep the hook wire rope vertical; c. Check that the wire rope is fixed properly. The hoisting commander sends a lifting signal to command the truck crane to slowly and steadily lift the lower crossbeam of the trolley. Lift the wheel tread of the traveling beam trolley 3 by 0.5m and let it hang still for 3 to 5 minutes. After checking that there are no abnormalities in the wire rope and the foundation, command the 25t truck crane 6 to move the trolley under the outrigger 2. When the flange of the lower crossbeam approaches the lower flange of the outrigger 2, command the 25t truck crane 6 to slowly drop the hook and support the fixed diagonal support of the trolley. After the above work is completed, the hook will be dropped after the hoisting commander sends a hook drop signal. The installer will remove the wire rope and prepare the other side of the traveling beam trolley 3; d. Move the 25t truck retractable legs 2 to the symmetrical position on the other side, and repeat the above process to hoist the right side running beam trolley into place and fix it.

[0019] Step S5: Connect the legs 2 to the traveling beam trolley. Fig.10 As shown, before lifting, the tail rollers 21 under the four legs 2 are removed to prepare for the beam to be put into place; Command two 130t truck cranes 4 to slowly drop the hooks, and the outrigger 2 is inserted into the mounting seat to improve the convenience of connection. A guide groove is set on the mounting seat to guide the assembly of the outrigger 2 and the lower crossbeam. First, align the lower crossbeam of the trolley on one side with the lower flange of the outrigger 2, insert the bolts and tighten them, and then align the lower crossbeam of the trolley on the other side with the lower flange of the outrigger, insert the bolts and tighten them; the installer reaches the installation platform at the top of the outrigger 2 along the ladder support of the outrigger 2, hangs the safety belt, and uses the intercom to coordinate with the ground command to adjust the truck crane, align the bolt holes of the upper flange, first insert the guide pin, perform the empty position correction, and then insert the bolts and tighten them after the bolt holes are accurately aligned to improve the installation efficiency; After the hoisting commander sends out the hook removal signal, the truck crane drops the hook and removes the hoisting wire rope, shackles and other rigging.

[0020] Step S6: hoisting the gantry crane trolley 5. Fig.11 , Fig.12 As shown, the total weight of the gantry crane trolley 5 is 14t. Two 6×29-34-1770 steel wire ropes with a length of 9 meters are used. The steel wire ropes are fixed to the lifting ears of the gantry crane trolley 5 with S-DX9.5 shackles. The gantry crane trolley 5 is hoisted into place with a 130t truck crane. How to do it: a. The lifting commander sends a lifting signal to lift the gantry crane trolley 5 0.3m off the ground and let it hang for 3-5 minutes to check if there are any abnormalities in the wire rope and the foundation. After the inspection is completed and confirmed to be normal, the lifting commander sends a lifting signal to command the 130t truck crane 4 to slowly lift the gantry crane trolley 5. When the bottom surface height of the gantry crane trolley 5 exceeds the railing elevation of the main beam 11 by 500mm, the lifting stops; b. The installation personnel go onto the main beam 11 and use the intercom to communicate with the ground lifting commander to instruct the mobile crane 4 to slowly rotate the big arm 41 to align the gantry crane trolley 5, align the wheels with the track and then drop the hook. Put the gantry crane trolley 5 on the track and fix the wheels with the prepared inclined wooden blocks. After the lifting commander sends a signal to remove the hook, the mobile crane drops the hook and removes the lifting wire rope, shackles and other rigging.

[0021] Step S7, installing auxiliary facilities and electrical equipment, setting the positions according to the drawings, installing the maintenance platform, ladder railings, etc. one by one, and checking whether their installation quality meets the requirements of the drawings; Crane post-installation commissioning and load test: After the mechanical and electrical installation is basically completed, mechanical and electrical commissioning shall be carried out; How to install the electrical system: The whole equipment is connected into a whole, and the rail clamp is clamped, the cable wind rope is hung, and then the electrical system is installed. During the electrical installation process, the wire rope is threaded and wound. The wire rope is straightened when threading and winding to prevent the hook from rotating after threading; Install the electrical system according to the electrical schematic, wiring diagram, electrical master plan and related technical documents; before installation, check whether all electrical components are in good condition and whether the installation method and location comply with relevant regulations; the installation of the electrical system shall be carried out according to the electrical design drawing of the equipment; After the electrical construction is completed, debugging is carried out to ensure that all walking and lifting mechanisms can work normally and the protective devices can be put into operation in time.

[0022] Step S8: Special equipment is inspected, filed, and registered for use, and put into use after passing the inspection.

[0023] like Fig.13 As shown, the dismantling of the gantry crane follows the principle of dismantling what was installed first last and what was installed last first. After completing the equipment dismantling and cancellation procedures, you can proceed with the preparatory work before dismantling. First, dismantle the electrical and safety devices, then dismantle the trolley and platform accessories, and disassemble the large parts. Disassemble the traveling beam trolley 3 and the outrigger 2, then lift the main beam 11 and the outrigger 2, lay them flat on the ground, disassemble the main beam 11 and the outrigger 2, dismantle each part, finally load them for shipment, and clean up the site.

[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

Claims

1. A foldable gantry crane, comprising a gantry (1) and legs (2), characterized in that: The gantry (1) comprises a main beam (11) and an end cross beam (12); one end of the support leg (2) is hinged to the main beam (11) via a pin shaft (22); a coupling device corresponding to the support leg (2) is provided on the lower side of the main beam (11); a tail roller (21) is provided on the other end of the support leg (2); a running beam trolley (3) is provided on the lower side of the gantry (1); the running beam trolley (3) comprises a main trolley, a passive trolley and a lower cross beam; a mounting seat adapted to the support leg (2) is provided on the upper side of the lower cross beam; and a gantry crane trolley (5) is provided on the upper side of the gantry (1).

2. An installation process for a foldable gantry crane according to claim 1, characterized in that: The installation steps include: S1. Before the crane is used for lifting, the main beam (11), outriggers (2), lower beam, trolley, gantry crane trolley (5) and electrical equipment are placed close to the set installation position according to the lifting plan to avoid secondary handling; S2. Assemble components on the ground, inspect before installation, clean the work site, and inspect all components of the gantry crane; assemble all components of the gantry crane, including the traveling beam trolley (3), main beam (11), bridge frame, and outriggers (2); S3, hoisting the main beam (11) and the outrigger (2) as a whole. After the main beam (11) and the outrigger (2) are assembled, two 130t truck cranes (4) are used to lift the equipment. The tail rollers (21) at the lower ends of the outriggers (2) slide on the track, and the coupling device temporarily fixes the main beam (11) and the outriggers (2); S4, hoisting the traveling beam trolley (3). After the traveling beam trolley (3) is assembled, the 25t truck crane (6) moves the traveling beam trolley (3) to the bottom of the outrigger (2). When the lower cross beam flange approaches the lower flange of the outrigger (2), the 25t truck crane (6) is directed to slowly drop the hook to support the fixed diagonal brace of the traveling beam trolley (3); S5, the connection between the outriggers (2) and the traveling beam trolley (3), before lifting, the tail rollers (21) under the four outriggers (2) are removed to prepare for the beam to be lowered into place; The 130t truck crane (4) slowly lowers the hook, the outrigger (2) is inserted into the mounting seat, the lower crossbeam is aligned with the lower flange of the outrigger (2), bolts are inserted and tightened, the bolt holes of the upper flange of the outrigger (2) are aligned with the main beam (11), bolts are inserted and tightened; S6, hoisting of the gantry crane trolley (5), the 130t truck crane (4) slowly lifts the gantry crane trolley (5), and stops lifting when the height of the bottom surface of the wheels of the gantry crane trolley (5) exceeds the height of the railing of the main beam (11) by 500mm; the 130t truck crane (4) slowly rotates the boom (41) to straighten the gantry crane trolley (5), places the gantry crane trolley (5) on the track, and fixes the wheels; S7. Ancillary facilities and electrical equipment shall be positioned and installed according to the drawings. Maintenance platforms and ladder railings shall be installed one by one, and their installation quality shall be checked to see if it meets the requirements of the drawings; Crane post-installation commissioning and load test: After the mechanical and electrical installation is basically completed, mechanical and electrical commissioning shall be carried out; S8. Special equipment shall be inspected, filed and registered for use and put into use after passing the inspection.

3. The installation process of a foldable gantry crane according to claim 2, characterized in that: In step S2, the assembly of the traveling beam trolley (3) is as follows: a. Select the assembly site and draw the positioning line on the ground; b. When assembling the traveling beam trolley (3), place the main trolley and the passive trolley according to the base distance of the traveling beam trolley (3) and fix them with diagonal braces. Use a 25t truck crane (6) to lift the lower crossbeam with the corresponding mark to the top of the trolley. After the hinge seat holes are aligned, insert the pin shaft, install the cotter pin, and assemble them into a whole.

4. The installation process of a foldable gantry crane according to claim 2, characterized in that: In step S2, the main beam (11) bridge frame is assembled: A1. Assemble the two rows of main beams (11) on the lower crossbeam of the traveling beam trolley (3) in sequence according to the section marks, and tighten the connecting bolts of the main beams (11); install the end crossbeam (12) between the two rows of main beams (11), and the installer shall check the dimensions according to the drawing requirements, and tighten the connecting bolts after confirming that the assembly is correct; after installation, install the accessories, and leave a position for hanging the wire rope for hoisting, and take protective measures for the wire rope at the sling; A2. After the upper bridge of the gantry crane is assembled, the installer will check the dimensions according to the drawing requirements. After confirming that the assembly is correct, the inspection record will be confirmed and filed by the installation team leader.

5. The installation process of a foldable gantry crane according to claim 2, characterized in that: In step S2, the assembly of the legs (2) is as follows: B1. Use a 25t truck crane (6) to lift the outrigger (2) to the outside of the main beam (11), and after the hinge pin hole is turned over and aligned, insert the pin shaft (22), install the split pin, and assemble the whole. B2. Install the tail roller (21) on the lower flange of the leg (2) by means of bolts. B3. Repeat the above steps to complete the connection between the remaining legs (2) and the main beam (11).

6. The installation process of a foldable gantry crane according to claim 2, characterized in that: In step S3, the main beam (11) and the legs (2) are hoisted as a whole: The 130t truck crane (4) is hooked, so that the hoisting wire rope is slightly stressed, the tail roller (21) at the lower end of the outrigger (2) contacts the track, the hook wire rope is kept vertical, and then the hook is slowly raised. When the lower end of the outrigger (2) exceeds the flange surface of the lower beam by 1m, the lifting is stopped.

7. The installation process of a foldable gantry crane according to claim 2, characterized in that: In step S7, the electrical system is installed: The whole equipment is connected into a whole, and the track clamps are clamped, the guy ropes are hung, and then the electrical system is installed; Install the electrical system according to the electrical schematic, wiring diagram, electrical master plan and related technical documents; before installation, check whether all electrical components are in good condition and whether the installation method and location comply with relevant regulations; The installation of the electrical system shall be carried out according to the electrical design drawing of the equipment; After the electrical construction is completed, debugging is carried out to ensure that all walking and lifting mechanisms can work normally and the protective devices can be put into operation in time.

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