Gantry crane mounting and dismounting system and mounting and dismounting method therefor

Abstract

A gantry crane mounting and dismounting system and a mounting and dismounting method therefor. The gantry crane mounting and dismounting system comprises a gantry crane, which comprises a main hoisting girder (100), traveling wheel seats (200) and support legs (300), wherein the support legs are connected and supported between the main hoisting girder and the traveling wheel seats; the traveling wheel seats are configured to move on tracks (500), and bottom beams (110) are respectively mounted at the bottoms of two ends of the main hoisting girder; the support legs are respectively arranged on two sides of the two ends of the main hoisting girder, and the traveling wheel seats are further respectively arranged on the two sides of the two ends of the main hoisting girder; two ends of the support leg on each side are respectively hinged to the traveling wheel seat and the bottom beam on the same side, and a gear (210) is mounted on one side of each traveling wheel seat; and racks (510) are mounted on the tracks on two sides at the positions corresponding to the traveling wheel seats, and the gears mesh with the racks for transmission. The gantry crane mounting and dismounting system further comprises jacking systems (700), and the two jacking systems are respectively configured to be arranged below the two ends of the main hoisting girder. By using the above structure to mount the gantry crane, it is possible to achieve quick, efficient, economical and safe mounting or dismounting with only simple tools and structures, without the aid of external large hoisting equipment.

Description

Portal crane mounting and dismounting system and mounting and dismounting method thereof TECHNICAL FIELD

[0001] The present application relates to the technical field of portal cranes, in particular to a portal crane mounting and dismounting system and mounting and dismounting method thereof. BACKGROUND

[0002] A portal crane, referred to as a portal crane, is a type of hoisting equipment that runs on a ground track. The installation and dismounting of the portal crane is currently mostly carried out by using large hoisting equipment to hoist each component, and after the metal structural components are installed, the installation of functional equipment is carried out in the air. This method is low in efficiency, highly dangerous, and poor in economy.

[0003] For example, CN114261901A, published on April 1, 2022, discloses a portal crane mounting method, which comprises the following steps: a connecting section is arranged at the installation position of the lower rigid leg of the main beam, and the inner side height of the connecting section is lower than the outer side height by a first set value, and the outer side of the rigid leg is rotationally connected with the outer side of the connecting section; the main beam is lifted, and after the rigid leg is adjusted to be substantially perpendicular to the main beam, the rigid leg and the connecting section are temporarily fixed; the rigid leg trolley, the flexible leg, and the flexible leg trolley are installed; the main beam is pulled so that the rigid leg reaches a first set offset, and then the connecting section and the rigid leg are welded. The characteristics are that it can solve the problem that the installation of the rigid leg of a large-tonnage crane in the prior art is difficult to meet the requirements, resulting in reinstallation and low construction efficiency. The disadvantage is that during installation, the main beam needs to be lifted to a high altitude using a large hoisting device, which is highly dangerous. SUMMARY

[0004] To solve the current technical problems, the main purpose of the present application is to provide a portal crane mounting and dismounting system and mounting and dismounting method thereof, which can realize rapid and efficient, economical, and safe installation and dismounting without the aid of external large hoisting equipment, only with the aid of simple tools and structures.

[0005] The technical solution adopted by the present application is:

[0006] A door machine mounting and dismounting system, comprising a door machine, the door machine comprising a main girder, a walking wheel base and a support leg, the support leg being connected between the main girder and the walking wheel base, four walking wheel bases being located on a track, the bottom of the two ends of the main girder being respectively provided with a bottom beam, the left and right sides of the two ends of the main girder being respectively provided with a support leg, the left and right sides of the two ends of the main girder being respectively provided with a walking wheel base, the two ends of each side of the support leg being respectively hinged with the walking wheel base and the bottom beam on the same side, one side of the walking wheel base being provided with a gear, the gear being connected and driven with a reduction motor installed on the walking wheel base, the two sides of the track being respectively provided with a rack at the position corresponding to the walking wheel base, the gear being engaged and driven with the rack; further comprising a jacking system, two jacking systems being respectively arranged below the two ends of the main girder.

[0007] The two ends of the bottom beam are respectively provided with a first hinge seat, the side surface of the upper end of the support leg is provided with a second hinge seat, the first hinge seat and the second hinge seat are hinged through a first pin shaft.

[0008] The lower side of the bottom beam is fixedly connected with a first flange at the position corresponding to the support leg, the upper end of the support leg is fixedly connected with a second flange, and the first flange and the second flange are connected through a first bolt.

[0009] The lower end of the support leg is fixedly connected with a third hinge seat, the top of the walking wheel base is fixedly connected with a fourth hinge seat, and the third hinge seat and the fourth hinge seat are hinged through a second pin shaft.

[0010] The rack is installed on the side surface of the track through a second bolt.

[0011] The walking wheel base comprises a rack, a roller and a reduction motor, at least one roller is rotatably installed in the rack, the reduction motor is installed on the rack, the center shaft of the roller is connected and driven with the output shaft of the reduction motor at one end, and the other end of the center shaft is provided with the gear.

[0012] The jacking system comprises a jacking oil cylinder and a hydraulic station, and the hydraulic station is connected with the jacking oil cylinder through a pipeline.

[0013] The jacking system further comprises a moving trolley, and the jacking oil cylinder and the hydraulic station are installed on the moving trolley; the moving trolley comprises a support plate and at least three casters, the casters are installed on the lower side of the support plate, and the jacking oil cylinder and the hydraulic station are installed on the support plate.

[0014] A plurality of supporting oil cylinders are further installed on the bottom of the support plate, the piston rods of the supporting oil cylinders are downwardly extended, and the end portions of the piston rods are provided with supporting plates.

[0015] The bottom beam is provided with a top block on the lower side.

[0016] The top of the jacking oil cylinder is provided with a top block.

[0017] Further comprising two crossbeams, each of which is mounted between two legs at the two ends of the main girder.

[0018] The installation and disassembly method of the gantry crane has the steps of:

[0019] S1, four racks are respectively installed and fixed on the side surfaces of two tracks, wherein two racks are installed on each track;

[0020] S2, four walking wheel seats are respectively installed on the positions corresponding to the racks on the two tracks;

[0021] S3, two crossbeams are respectively placed on the two tracks, and each crossbeam is located between two walking wheel seats;

[0022] S4, one end of each leg is hinged to a walking wheel seat through a pin shaft, and the other end is placed on a crossbeam;

[0023] S5, the main girder is hoisted onto the legs, and the two ends of the bottom beam are respectively hinged to the top ends of the two legs;

[0024] S6, jacking operation; during the jacking operation, two jacking systems are respectively placed on the ground below the two ends of the main girder, the jacking systems at the two ends of the main girder are synchronously jacked, the main girder is lifted, and during the jacking process, the gears are in meshing transmission with the racks, so that the two walking wheel seats on each side move towards each other;

[0025] S7, climbing operation; after the main girder is jacked to a certain height through the jacking operation, the climbing operation stage is entered, the gear driven by the speed reducer is in meshing transmission with the rack, the walking wheel seats on each track are continuously synchronously operated, the lower end of the leg is pushed, the main girder is lifted, and when the two legs are folded to the final installation angle, the operation is stopped, at this time, the upper end of the leg is in contact with the bottom beam, the leg and the bottom beam are connected and fixed;

[0026] S8, the crossbeams placed on the tracks are lifted to the installation height, and the two ends of the crossbeams are respectively connected and fixed with the two legs on the two sides;

[0027] S9, the gears and the racks are removed, and the installation is completed;

[0028] When the gantry crane needs to be disassembled, S9-S1 are reversely operated.

[0029] The present application has the following beneficial effects:

[0030] 1. The application is based on the existing door machine and track, the corresponding positions of the upper part of the door machine support leg and the lower part of the bottom beam are designed as a matched flange connection mode, a hinge point is arranged on the outside, and the connection is realized through a pin shaft; the connection part between the lower end of the door machine support leg and the walking wheel is adjusted as a hinge point and a pin shaft connection mode, so that the swing angle of the support leg during installation is realized; a gear is installed on the outside of the door machine walking wheel seat, and a rack is installed on the side of the track, the lifting main beam is driven to climb through the meshing of the rack, and a jacking system is further arranged, which is used to eliminate the dead point between the bottom beam and the support leg, and assist in jacking the lifting main beam. The above structure is used for installing or dismounting the door machine, which can realize the installation or dismounting of the door machine without the help of external large lifting equipment, only with the aid of simple tools and structure, realizing the fast, efficient, economic and safe installation or dismounting of the door machine.

[0031] 2. The application further comprises a cross beam, which is used to be placed on the track to support the support leg and the lifting main beam above the support leg during installation of the door machine; after the lifting main beam is climbed in place, the cross beam is connected between the two support legs to improve the stability of the door machine. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0033] Fig. 1 is a schematic view of the state of the application before jacking operation.

[0034] Fig. 2 is an enlarged structural schematic view of A in Fig. 1.

[0035] Fig. 3 is a structural schematic view of the jacking system of the application.

[0036] Fig. 4 is a structural schematic view of the application after installation.

[0037] In the drawings: the lifting main beam 100, the bottom beam 110, the first hinge seat 111, the first flange 112, the top block 120, the first bolt 130; the walking wheel seat 200, the rack 201, the fourth hinge seat 202, the roller wheel 203, the gear 210, the speed reducer motor 211; the support leg 300, the second hinge seat 301, the third hinge seat 302, the second flange 303, the first pin shaft 304, the second pin shaft 305; the cross beam 400; the track 500, the threaded hole 501, the rack 510, the second bolt 511; the jacking system 700, the jacking oil cylinder 710, the hydraulic station 720, the moving trolley 730, the support plate 731, the castor 732, the support oil cylinder 740, the support plate 741, the piston rod 742. DETAILED DESCRIPTION

[0038] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0039] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict between them.

[0042] Embodiment one:

[0043] Referring to Fig. 1, a door machine mounting and dismounting system comprises a door machine, the door machine comprising a main girder 100, a walking wheel base 200 and a supporting leg 300, the supporting leg 300 being connected between the main girder 100 and the walking wheel base 200, and four walking wheel bases 200 being located on a track 500; wherein the bottom of the two ends of the main girder 100 is respectively provided with a bottom beam 110, the left and right sides of the two ends of the main girder 100 are respectively provided with the supporting leg 300, the left and right sides of the two ends of the main girder 100 are respectively provided with the walking wheel base 200, the two ends of each side of the supporting leg 300 are respectively hinged with the walking wheel base 200 and the bottom beam 110 on the same side, one side of the walking wheel base 200 is provided with a gear 210, the gear 210 is connected and driven with a speed reducer motor 211 mounted on the walking wheel base 200, the two sides of the track 500 are respectively provided with a rack 510 at the position corresponding to the walking wheel base 200, and the gear 210 is engaged and driven with the rack 510; further comprising a jacking system 700, two jacking systems 700 are respectively arranged below the two ends of the main girder 100, and the jacking system 700 is used for eliminating the jacking dead point between the bottom beam 110 and the supporting leg 300 and assisting in jacking the main girder 100.

[0044] By arranging the bottom beam 110 on the lower side of the main girder 100, the bottom beam 110 is hinged with the supporting leg 300, in Fig. 1, the two ends of the bottom beam 110 extend out of the main girder 100. The bottom beam 110 can be a rod piece, a plate piece or a metal structural piece. After the main girder 100 is jacked to a certain height by the two jacking systems 700, the gear 210 on the walking wheel base 200 is engaged and driven with the rack 510 on the track 500, so as to further make the main girder 100 climb, when the top of the supporting leg 300 is close to the bottom beam 110, the top of the supporting leg 300 is welded or bolted with the bottom beam 110, so as to complete the mounting of the door machine.

[0045] The door machine is mounted or dismounted by using the above structure, the long-time high-altitude hoisting without the aid of external large-scale hoisting equipment can be realized, only simple tools and structures are assisted, and the mounting or dismounting can be realized quickly, efficiently, economically and safely.

[0046] Referring to Fig. 1, the two ends of the bottom beam 110 are respectively provided with first hinge seats 111, the upper side of the upper end of the supporting leg 300 is provided with a second hinge seat 301, and the first hinge seat 111 and the second hinge seat 301 are hinged by a first pin shaft 304.

[0047] Referring to Fig. 1, the lower side of the bottom beam 110 is fixedly connected with a first flange 112 at the position corresponding to the supporting leg 300, and the upper end of the supporting leg 300 is fixedly connected with a second flange 303, referring to Fig. 4, when the top of the supporting leg 300 is close to the bottom beam 110, the first flange 112 and the second flange 303 are connected by a first bolt 130, so as to quickly connect the supporting leg 300 with the bottom beam 110.

[0048] Referring to Fig. 2, the lower end of the leg 300 is fixedly connected with a third hinge base 302, the top of the walking wheel base 200 is fixedly connected with a fourth hinge base 202, and the third hinge base 302 and the fourth hinge base 202 are hingedly connected through a second pin shaft 305.

[0049] In order to facilitate the installation and dismounting of the rack 510, bolt holes are arranged on the rack 510, and threaded holes 501 are arranged on the side surface of the track 500, and the rack 510 is installed and fixed with the threaded holes 501 on the track 500 through the second bolt 511. When installed, the tooth groove of the rack 510 faces upward, and the rack 510 is engaged with the gear 210.

[0050] In one of the embodiments, referring to Fig. 2, the walking wheel base 200 comprises a frame 201, a roller 203 and a speed reducer motor 211, at least one roller 203 is rotatably installed in the frame 201, the speed reducer motor 211 is installed on the frame 201, the center shaft 204 of the roller 203 is connected with the output shaft of the speed reducer motor 211 at one end for transmission, and the other end of the center shaft 204 is installed with the gear 210. The roller 203 and the gear 210 are driven to rotate by the speed reducer motor 211, so that the walking wheel base 200 walks on the track 500. The working diameters of the roller 203 and the gear 210 are the same.

[0051] In another scheme, the walking wheel base 200 is installed with a speed reducer motor 211 for separately driving the gear 21 to rotate, the gear 21 is installed on the output shaft of the speed reducer motor 211,

[0052] Referring to Fig. 3, the jacking system 700 comprises a jacking oil cylinder 710 and a hydraulic station 720, the hydraulic station 720 is connected with the jacking oil cylinder 710 through a pipeline, and the jacking oil cylinder 710 is driven to extend and retract by the hydraulic station 720. The dead point between the bottom beam 110 and the leg 300 is eliminated by the extension of the jacking oil cylinder 710, and the main beam 100 is assisted to be jacked up. The jacking system 700 can adopt a multi-stage oil cylinder. The jacking oil cylinder 710 on each side can be one or multiple.

[0053] Further, the jacking system 700 further comprises a moving trolley 730, and the jacking oil cylinder 710 and the hydraulic station 720 are respectively installed on the moving trolley 730; the moving trolley 730 comprises a support plate 731 and at least three casters 732, the casters 732 are installed on the lower side of the support plate 731, and the jacking oil cylinder 710 and the hydraulic station 720 are installed on the support plate 731. By arranging the moving trolley 730, the jacking oil cylinder 710 and the hydraulic station 720 are facilitated to move.

[0054] Further, the bottom of the support plate 731 is also provided with a plurality of support oil cylinders 740, the piston rod 742 of the support oil cylinder 740 extends downward, and the end of the piston rod 742 is provided with a support plate 741. In use, the piston rod of the support oil cylinder 740 is elongated, the support plate 741 contacts the ground, and the moving trolley 730 is more stable.

[0055] Specifically, the four corners and the middle of the bottom of the support plate 731 are respectively provided with support oil cylinders 740, and the support oil cylinders 740 are centrally controlled by the hydraulic station 720 to realize synchronous extension and contraction.

[0056] Further, in order to improve the stability of the jacking oil cylinder 710, referring to FIGS. 1 and 3, the bottom beam 110 is provided with a top block 120 at the position in contact with the jacking system 700.

[0057] In another scheme, the top block 120 is installed on the top of the jacking oil cylinder 710.

[0058] Referring to FIGS. 1 and 4, the door machine also includes two cross beams 400, which are respectively installed between the two legs 300 at the two ends of the main girder 100. The cross beam 400 is accurately placed on the track 500 after positioning by calculation when the door machine is installed, and is used to support the legs 300 and the main girder 100 above the legs 300; after the main girder 100 is climbed into place, the cross beam 400 is connected between the two legs 300, and is used to improve the stability of the door machine. The cross beam 400 can be welded with the leg 300, or can be bolted through a flange structure.

[0059] Embodiment two:

[0060] Referring to FIGS. 1 and 4, a door machine installation and disassembly system is adopted, and the installation method of the door machine includes the following steps:

[0061] S1, four racks 510 are respectively installed and fixed to the side surfaces of the two tracks 500, wherein two racks 510 are installed on each track 500;

[0062] S2, four walking wheel seats 200 are respectively installed on the two tracks 500 at positions corresponding to the racks 510;

[0063] S3, two cross beams 400 are respectively placed on the two tracks 500, and the cross beam 400 on each side is located between the two walking wheel seats 200;

[0064] S4, the leg 300 is hinged to the walking wheel seat 200 at one end through a pin shaft, and is placed on the cross beam 400 at the other end;

[0065] S5, hoist the main girder 100 to the outrigger 300, and hinge the two ends of the bottom beam 110 to the top ends of the two outriggers 300 respectively;

[0066] S6, jacking operation; during jacking operation, place two jacking systems 700 under the two ends of the main girder 100 on the ground, and the jacking systems 700 at the two ends of the main girder 100 are synchronously jacked to lift the main girder 100, during the jacking process, the gear 210 is in meshing transmission with the rack 510 to move the two walking wheel seats 200 on each side towards each other;

[0067] S7, climbing operation; after the main girder 100 is jacked to a certain height through jacking operation, enter the climbing operation stage, the gear 210 is in meshing transmission with the rack 510 driven by the reduction motor 211 to continuously synchronously run the walking wheel seat 200 on each track 500 towards each other, push the lower end of the outrigger 300 to lift the main girder 100, and stop when the two outriggers 300 are folded to the final installation angle, at which time the upper end of the outrigger 300 is in contact with the bottom beam 110 to connect and fix the outrigger 300 with the bottom beam 110;

[0068] S8, lift the cross beam 400 placed on the track 500 to the installation height, and connect and fix the two ends of the cross beam 400 with the two outriggers 300 respectively;

[0069] S9, remove the gear 210 and the rack 510, and complete the installation;

[0070] When the portal crane needs to be disassembled, reverse the operation of S9-S1.

[0071] Example three:

[0072] Specifically, the portal crane installation process is as follows:

[0073] First, install the track foundation and the track 500 on the ground, then according to the size of the outrigger 300, calculate and accurately measure to install the rack 510 to the side of the track 500, and use the second bolt 511 for reliable installation and fixation. After measuring the size and position, use small lifting equipment to install the walking wheel seat 200 on the corresponding track 500, then use the horizontal installation method shown in FIG. 1 to connect the outrigger 300 to the walking wheel seat 200 through the second pin shaft 305, support the other end of the outrigger 300 on the cross beam 400 placed on the track 500 and temporarily support it, then use small lifting equipment to hoist the main girder 100, hinge the first hinge seat 111 and the second hinge seat 301 through the first pin shaft 304, and then install the devices and equipment in the machine room on the main girder 100, as well as the external frame, roof, lightning rod and other facilities of the machine room. The entire portal crane is installed in a low-mounted state.

[0074] Carry out the installation and debugging of the internal power supply and control circuit of the portal crane, ensure that each mechanism is adjusted in place, and the electric debugging meets the operation requirements, so that the subsequent top lifting operation can begin.

[0075] The subsequent operation is divided into two stages: the jacking operation and the climbing operation. If only the jacking stage is used to reach the position, the jacking height is high, and the requirements for the jacking height of the jacking equipment are very high, which is poor in economy and applicability. If only the climbing stage is used to reach the position, the horizontal component force required for climbing is very large in the initial stage of climbing because of the large weight of the climbed equipment and the small horizontal angle, and the power and structural strength requirements for the climbing equipment are very high, which is poor in economy and feasibility. Therefore, the combined jacking and climbing mode is the optimal mode.

[0076] During the jacking operation, the two jacking systems 700 are placed on the ground outside the portal crane track, and the jacking system 700 is located below the bottom beam 110. First, the support oil cylinder 740 of the jacking system 700 is driven to act, the piston rod end of the support oil cylinder 740 is connected with the support plate 741, the piston rod of the support oil cylinder 740 is extended, and the support plate 741 is reliably supported on the ground. Then, the jacking oil cylinder 710 is driven to extend the piston rod to top the jacking block 120, each jacking oil cylinder 710 is synchronously actuated, and the whole lifting girder 100 is smoothly lifted. When the lifting height reaches a certain height, the jacking stage ends. The jacking height is determined by calculation to ensure that the stress in the subsequent climbing operation process is within the design range and no overload problem occurs. The reduction motor 211 can drive the outrigger 300 to continue the climbing operation.

[0077] During the climbing process, the reduction motor 211 drives the gear 210 on the walking wheel seat 200 to rotate, the gear 210 is engaged with the rack 510, and the two walking wheel seats 200 on both sides of the track move synchronously towards each other. In the process, the outrigger 300 is further lifted and gradually approaches. When the two outriggers 300 at both ends of the lifting girder 100 are folded to the final installation angle, the process stops. At this time, the second flange 303 on the upper part of the outrigger 300 and the first flange 112 on the bottom of the bottom beam 110 are accurately aligned. The first flange 112 and the second flange 303 are connected and fixed by the first bolt 130.

[0078] Further, the cross beam 400 placed in advance on the track 500 is lifted by a hoist or a small lifting device and bolted to the inner connecting surface of the two outriggers 300, which completes the entire installation work.

[0079] The installation device and method described in the patent can be widely used on various large-scale equipment, large-scale steel members or structures with rotating hinge outriggers. The principles and steps are similar to the case described in the patent, but they are within the protection scope of the patent.

[0080] Obviously, the above embodiments are merely example for clearly illustrating but not limitation to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments need not and can not be enumerated. The obvious changes or variations derived from the above description are still within the protection scope of the present application.

Claims

A gantry mounting and dismounting system, comprising a gantry, the gantry comprising a hoisting girder (100), a walking wheel base (200) and a supporting leg (300), the supporting leg (300) being connected between the hoisting girder (100) and the walking wheel base (200), four walking wheel bases (200) being located on a track (500), characterized in that: The bottom of the two ends of the lifting girder (100) is respectively provided with a bottom beam (110), the left and right sides of the two ends of the lifting girder (100) are respectively provided with a support leg (300), the left and right sides of the two ends of the lifting girder (100) are respectively provided with a walking wheel seat (200), the two ends of each side of the support leg (300) are respectively hinged with the walking wheel seat (200) and the bottom beam (110) on the same side, one side of the walking wheel seat (200) is provided with a gear (210), the gear (210) is connected and driven with a speed reducer motor (211) installed on the walking wheel seat (200), the two sides of the track (500) are respectively provided with a rack (510) at the position corresponding to the walking wheel seat (200), the gear (210) is meshed and driven with the rack (510); it also comprises a jacking system (700), and the two jacking systems (700) are arranged below the two ends of the lifting girder (100) respectively. A door machine mounting and dismounting system according to claim 1, characterized in that The two ends of the bottom beam (110) are respectively provided with a first hinge seat (111), the side surface of the upper end of the support leg (300) is provided with a second hinge seat (301), the first hinge seat (111) and the second hinge seat (301) are hinged through a first pin shaft (304). A door machine mounting and dismounting system according to claim 2, characterized in that The lower side of the bottom beam (110) is fixedly connected with a first flange (112) at the position corresponding to the support leg (300), the upper end of the support leg (300) is fixedly connected with a second flange (303), and the first flange (112) and the second flange (303) are connected through a first bolt (130). A door machine mounting and dismounting system according to claim 1, characterized in that The lower end of the support leg (300) is fixedly connected with a third hinge seat (302), and the top of the walking wheel seat (200) is fixedly connected with a fourth hinge seat (202), the third hinge seat (302) and the fourth hinge seat (202) are hinged through a second pin shaft (305). A door machine mounting and dismounting system according to claim 1, characterized in that The rack (510) is installed on the side surface of the track (500) through a second bolt (511). A door machine mounting and dismounting system according to claim 1, characterized in that The walking wheel seat (200) comprises a rack (201), a roller wheel (203) and a speed reducer motor (211), at least one roller wheel (203) is rotatably installed in the rack (201), the speed reducer motor (211) is installed on the rack (201), one end of the central shaft (204) of the roller wheel (203) is connected and driven with the output shaft of the speed reducer motor (211), and the other end of the central shaft (204) is provided with the gear (210). A door machine mounting and dismounting system according to claim 1, characterized in that The jacking system (700) comprises a jacking oil cylinder (710) and a hydraulic station (720), and the hydraulic station (720) is connected with the jacking oil cylinder (710) through a pipeline. A door machine mounting and dismounting system according to claim 7, characterized in that The jacking system (700) further comprises a moving trolley (730), and the jacking oil cylinder (710) and the hydraulic station (720) are installed on the moving trolley (730); the moving trolley (730) comprises a supporting plate (731) and at least three casters (732), the casters (732) are installed on the lower side of the supporting plate (731), and the jacking oil cylinder (710) and the hydraulic station (720) are installed on the supporting plate (731). A door machine mounting and dismounting system according to claim 8, characterized in that The bottom of the support plate (731) is also provided with a plurality of support oil cylinders (740), the piston rod (742) of the support oil cylinder (740) extends downward, and the end of the piston rod (742) is provided with a support plate (741). A door machine mounting and dismounting system according to claim 8 or 9, characterized in that The top block (120) is arranged on the lower side of the bottom beam (110). A door machine mounting and dismounting system according to claim 8 or 9, characterized in that The top block (120) is arranged on the top of the jacking oil cylinder (710). A door machine mounting and dismounting system according to claim 1, characterized in that The cross beams (400) are arranged between the two legs (300) at the two ends of the main girder (100). The method for installing and dismounting the door machine system according to claim 12, characterized in that, The installation method of the portal crane comprises the following steps: S1, four racks (510) are respectively arranged on the sides of two tracks (500), wherein two racks (510) are arranged on each track (500); S2, four walking wheel bases (200) are respectively arranged on the tracks (500) corresponding to the racks (510); S3, two cross beams (400) are respectively arranged on the tracks (500), and the cross beam (400) on each side is arranged between the two walking wheel bases (200); S4, one end of the leg (300) is hingedly connected to the walking wheel base (200), and the other end is arranged on the cross beam (400); S5, the main girder (100) is hoisted to the leg (300), and the two ends of the bottom beam (110) are hingedly connected to the top ends of the legs (300) on both sides; S6, jacking operation; during the jacking operation, two jacking systems (700) are arranged on the ground under the two ends of the main girder (100), the jacking systems (700) at the two ends of the main girder (100) are synchronously jacked, the main girder (100) is jacked up, and during the jacking process, the gear (210) is in meshing transmission with the rack (510), so that the two walking wheel bases (200) on each side are moved towards each other; S7, climbing operation; after the main girder (100) is jacked up to a certain height through the jacking operation, the climbing operation is entered, the gear (210) is in meshing transmission with the rack (510) driven by the speed reducer (211), the walking wheel bases (200) on the tracks (500) on each side are continuously synchronously moved towards each other, the lower end of the leg (300) is pushed, the main girder (100) is lifted, and when the two legs (300) are folded to the final installation angle, the operation is stopped, at this time, the upper end of the leg (300) is in contact with the bottom beam (110), the leg (300) is connected and fixed with the bottom beam (110); S8, the cross beam (400) arranged on the track (500) is lifted to the installation height, and the two ends of the cross beam (400) are respectively connected and fixed with the legs (300) on both sides; S9, the gear (210) and the rack (510) are removed, and the installation is completed. When the portal crane needs to be disassembled, the steps S9-S1 are reversely operated.

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