Adjustable base gantry crane

Abstract

The present invention discloses a base-adjustable portal crane, which relates to the technical field of cranes. The base-adjustable portal crane comprises a first base, a second base, a plug-in mechanism, a stabilizing mechanism, a control mechanism and a moving mechanism, wherein the moving mechanism is arranged on the first base, and the moving mechanism comprises a notch, a rotating plate, a connecting plate, a universal wheel and an arc-shaped support rod, and a group of notches are provided on the front and rear sides of the first base. The base-adjustable portal crane, through the coordinated use of the first base, the second base and the moving mechanism, adds a movable function to the first base and the second base, and can be easily moved between different work sites without the need for complicated disassembly and reinstallation, which enables them to quickly adapt to different work environments and task requirements, and has a higher working speed and a larger working range, which enables them to complete tasks faster.

Description

Technical Field

[0001] The present invention relates to the technical field of cranes, in particular to cranes. Background Art

[0002] The application document with publication number CN216190435U discloses a reinforced and stable gantry crane base, including a bottom block and a mounting block, and also including a movable structure capable of adjusting the ground contact area, a stable structure capable of being fixed, and an adjustment structure capable of increasing the transportation range. The movable structure is installed on both sides inside the bottom block, mounting blocks are installed on both sides of the top of the bottom block, the stable structure is installed inside the mounting block, a main beam is arranged on the top of the mounting block, and the adjustment structure is installed inside the main beam. The adjustment structure also includes an air pump, which is installed at the middle position of the top of the bottom block, and a telescopic rod is installed on the top of the air pump, and a connecting block is installed on the top of the telescopic rod. The telescopic rod is controlled by the air pump, and the height of the connecting block can be adjusted under the telescopic rod. Due to the connection between the support block and the first spring block, the main beam can be supported at different heights to maintain its stability.

[0003] However, the base of the above-mentioned crane cannot be moved at will. Once the immovable gantry crane is installed in a place, it cannot be easily moved, which makes them only used in a fixed work site and unable to adapt to different work environments and task requirements. Therefore, each work site needs to be equipped with a device, which further increases the cost. In addition, it usually has a lower working speed and a smaller working range, which makes them complete tasks more slowly and less efficiently. For this reason, we propose a gantry crane with an adjustable base. Summary of the invention

[0004] The purpose of the present invention is to provide a gantry crane with an adjustable base, which can solve the problem that the base of some existing cranes is difficult to move and causes more inconvenience.

[0005] To achieve the above object, the present invention provides the following technical solution: a gantry crane with adjustable base, comprising:

[0006] First base;

[0007] The second base and the first base are both provided with two sets of main beams directly above the second base. A lifting device is provided directly above the first base. The four sets of main beams are all fixedly installed on the lifting device. Two sets of sockets are fixedly installed on the tops of the first base and the second base. The four sets of main beams are all plugged into the corresponding sockets.

[0008] A plug-in mechanism, which is arranged on the first base and is used to fix each main beam when it is plugged into the plug sleeve;

[0009] A stabilizing mechanism, which is arranged on the first base and is used to improve the stability of the crane;

[0010] A control mechanism, which is arranged on the first base, and is used to control the adjustment of the crane base;

[0011] A moving mechanism is arranged on a first base, and the moving mechanism includes a notch, a rotating plate, a connecting plate, a universal wheel and an arc-shaped support rod. A group of notches are opened on the front and rear sides of the first base, a group of rotating plates are rotatably installed between the inner walls on both sides of the two groups of notches, a group of connecting plates are fixedly installed on the two groups of rotating plates, at least two groups of universal wheels are arranged on the two groups of connecting plates, at least two groups of arc-shaped support rods are fixedly installed on the inner walls of the two groups of notches, and the two groups of rotating plates are movably sleeved on the corresponding arc-shaped support rods.

[0012] Preferably, the moving mechanism also includes strip grooves, hydraulic rods, U-shaped mounting frames, pressure rollers and limit plates. Two groups of strip grooves are opened at the bottom of the first base, and a group of hydraulic rods are fixedly installed on the inner walls of the two groups of strip grooves. The free ends of the two groups of hydraulic rods pass through the first base and extend into the corresponding notches and are fixedly installed with a group of U-shaped mounting frames. A group of pressure rollers are rotatably installed between the inner walls of both sides of the two groups of U-shaped mounting frames, and the two groups of pressure rollers are in conflict with the corresponding rotating plates. A group of limit plates are fixedly installed on the front and rear outer surfaces of the first base.

[0013] Preferably, the plug-in mechanism includes a fixed table, an installation cavity, a double-headed motor, a transmission groove, a lead screw, a sliding rod, a movable plate and a plug rod. A fixed table is fixedly installed on the top of the first base, an installation cavity is opened inside the fixed table, a double-headed motor is fixedly installed in the installation cavity, two groups of transmission grooves are opened on the top of the fixed table, a group of lead screws are rotatably installed between the front and rear inner walls of the two groups of transmission grooves, a group of sliding rods are fixedly installed between the front and rear inner walls of the two groups of transmission grooves, the rotating shaft of the double-headed motor is transmission-connected with the two groups of lead screws, a group of movable plates are threadedly installed on the two groups of lead screws, the two groups of movable plates are movably sleeved on the corresponding sliding rods, two groups of plug rods are fixedly installed on the two groups of movable plates, and one end of the four groups of plug rods passes through the fixed table and the corresponding main beam and the plug sleeve.

[0014] Preferably, the stabilizing mechanism includes a rectangular groove, a through groove, a rotating handle, a rectangular block, a pressure plate, a connecting rod, a stabilizing plate, and a rectangular groove is provided at the bottom of the first base, through grooves are provided on both sides of the first base, a rotating handle is rotatably installed at the inner bottom of the through groove, a rectangular block is rotatably installed at the inner top of the rectangular groove, the rotating shaft of the rotating handle is transmission connected with the rectangular block, two groups of pressure plates are arranged in the rectangular groove, two groups of connecting rods are fixedly installed on the outer surface of one side of the two groups of pressure plates, two groups of receiving grooves are provided at the bottom of the first base, a group of stabilizing plates are provided in the two groups of receiving grooves, one end of the four groups of connecting rods penetrates the first base and is fixedly connected to the corresponding stabilizing plate, the rectangular block is in conflict with the outer surface of the other side of the two groups of pressure plates, and a group of springs are sleeved on the four groups of connecting rods.

[0015] Preferably, the control mechanism includes an operating hole, a cover plate, a handle, a control panel and control buttons. An operating hole is opened on one side of the first base, and a cover plate is hingedly installed at the operating hole. A handle is fixedly installed on the outer surface of one side of the cover plate, and a control panel is fixedly installed on the inner wall of the operating hole. At least two groups of control buttons are provided on the control panel.

[0016] Preferably, at least two groups of drainage grooves are provided through both sides of the fixed platform to facilitate drainage of rainwater in the transmission groove.

[0017] Preferably, a group of rubber pads are fixedly installed at the bottom of the two groups of stabilizing plates to improve the contact efficiency between the two groups of stabilizing plates and the ground, so as to achieve full contact between the two groups of stabilizing plates and the ground.

[0018] Preferably, two sets of mounting plates are fixedly mounted on both side outer surfaces of the first base.

[0019] Preferably, a mounting groove is provided on one side of the first base, a battery is arranged in the mounting groove, a mounting plate is installed at the mounting groove by bolts, and two groups of power signal lights are provided on one side of the first base to facilitate understanding of the battery power.

[0020] Preferably, the structure on the second base is the same as that on the first base.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The base-adjustable gantry crane, through the coordinated use of the first base, the second base and the moving mechanism, adds a movable function to the first base and the second base, so that they can be easily moved between different work sites without the need for complicated disassembly and reinstallation, which enables them to quickly adapt to different working environments and task requirements, and has a higher working speed and a larger working range, which enables them to complete tasks faster and improve work efficiency. They can also switch back and forth between mobile and fixed states, and can also ensure stability during work.

[0023] (2) The base-adjustable gantry crane realizes detachable operation between the main beam and the first base and the second base through the coordinated use of the main beam, the plug-in mechanism and the plug-in sleeve. This design is convenient for transportation and installation. The main beam and the base can be manufactured and transported separately and then assembled on site. Secondly, this design is convenient for maintenance and replacement. If the main beam or the base needs to be repaired or replaced, it can be quickly disassembled and reinstalled. The non-welded design can also extend the service life, reduce the risk of structural deformation and cracks, improve safety, and ensure the use effect of the crane.

[0024] (3) The base-adjustable gantry crane, through the coordinated use of the first base, the second base and the stabilizing mechanism, further expands the overall contact area between the first base and the second base and the ground before the crane is fixedly installed and used, which can improve the stability and safety of the crane and reduce the risk of overturning and movement. At the same time, this can also reduce the pressure of the crane on the ground and reduce damage and deformation to the ground. In addition, increasing the contact area can also improve the load-bearing capacity and working performance of the crane, making it more stable and reliable, which is conducive to the promotion and use of the crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0026] Figure 1 It is a front perspective view of the present invention;

[0027] Figure 2 It is a front perspective view of the structure on the first base of the present invention;

[0028] Figure 3 It is a right side view of the structure on the first base of the present invention;

[0029] Figure 4 A partial bottom view of the structure on the first base of the present invention;

[0030] Figure 5 It is a partial bottom-up stereogram of the structure on the first base of the present invention;

[0031] Figure 6 It is a schematic diagram of the partial internal structure of the first base structure of the present invention;

[0032] Figure 7 It is a schematic diagram of the partial internal structure of the structure on the fixed platform of the present invention;

[0033] Figure 8 This is a partial bottom-up stereoscopic view of the structure on the first base from another angle of the present invention.

[0034] Figure numerals: 1, first base; 2, second base; 3, main beam; 4, lifting device; 5, moving mechanism; 51, notch; 52, rotating plate; 53, connecting plate; 54, universal wheel; 55, arc support rod; 56, strip groove; 57, hydraulic rod; 58, U-shaped mounting frame; 59, top pressure roller; 510, limit plate; 6, plug-in mechanism; 61, fixed platform; 62, installation cavity; 63, double-headed motor; 64, transmission groove; 65, lead screw; 66, slide Rod; 67, movable plate; 68, plug rod; 7, stabilizing mechanism; 71, rectangular groove; 72, through groove; 73, turning handle; 74, rectangular block; 75, pressure plate; 76, connecting rod; 77, stabilizing plate; 78, spring; 8, control mechanism; 81, operating hole; 82, cover plate; 83, pull handle; 84, control panel; 85, control button; 9, plug sleeve; 10, drainage groove; 11, rubber pad; 12, mounting plate; 13, mounting plate; 14, power signal light. DETAILED DESCRIPTION

[0035] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] In the description of the present invention, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0038] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0039] See also Figure 1-8The present invention provides a technical solution: a base-adjustable portal crane, comprising a first base 1, a second base 2, a plug-in mechanism 6, a stabilizing mechanism 7, a control mechanism 8 and a moving mechanism 5. Two sets of main beams 3 are arranged directly above the second base 2 and the first base 1, a lifting device 4 is arranged directly above the first base 1, and the four sets of main beams 3 are fixedly installed on the lifting device 4. Two sets of sockets 9 are fixedly installed on the tops of the first base 1 and the second base 2, and the four sets of main beams 3 are plugged into the corresponding sockets 9. The plug-in mechanism 6 is arranged on the first base 1, and the plug-in mechanism 6 is used to Each main beam 3 is fixed when plugged into the socket 9. A stabilizing mechanism 7 is arranged on the first base 1. The stabilizing mechanism 7 is used to improve the stability of the crane. A control mechanism 8 is arranged on the first base 1. The control mechanism 8 is used to control the adjustment of the crane base. Two groups of mounting plates 12 are fixedly mounted on the outer surfaces of both sides of the first base 1. A mounting groove is opened on one side of the first base 1. A battery is arranged in the mounting groove. A mounting plate 13 is installed at the mounting groove by bolts. Two groups of power signal lights 14 are arranged on one side of the first base 1. The structure on the second base 2 is the same as that on the first base 1.

[0040] The moving mechanism 5 is arranged on the first base 1, and the moving mechanism 5 includes a notch 51, a rotating plate 52, a connecting plate 53, a universal wheel 54 and an arc-shaped support rod 55. A group of notches 51 are opened on the front and rear sides of the first base 1, and a group of rotating plates 52 are rotatably installed between the inner walls on both sides of the two groups of notches 51. A group of connecting plates 53 are fixedly installed on the two groups of rotating plates 52. At least two groups of universal wheels 54 are arranged on the two groups of connecting plates 53. At least two groups of arc-shaped support rods 55 are fixedly installed on the inner walls of the two groups of notches 51, and the two groups of rotating plates 52 are movably sleeved on the corresponding arc-shaped support rods 55.

[0041] The moving mechanism 5 also includes a strip groove 56, a hydraulic rod 57, a U-shaped mounting frame 58, a top pressure roller 59 and a limit plate 510. Two groups of strip grooves 56 are opened at the bottom of the first base 1. A group of hydraulic rods 57 are fixedly installed on the inner walls of the two groups of strip grooves 56. The free ends of the two groups of hydraulic rods 57 penetrate the first base 1 and extend into the corresponding notch 51 and are fixedly installed with a group of U-shaped mounting frames 58. A group of top pressure rollers 59 are rotatably installed between the inner walls of both sides of the two groups of U-shaped mounting frames 58. The two groups of top pressure rollers 59 are in conflict with the corresponding rotating plates 52. The front and rear outer sides of the first base 1 A group of limit plates 510 are fixedly installed on the surface. Through the coordinated use of the first base 1, the second base 2 and the moving mechanism 5, the first base 1 and the second base 2 are given a movable function, and can be easily moved between different work sites without the need for complicated disassembly and reinstallation, which enables them to quickly adapt to different working environments and task requirements, with a higher working speed and a larger working range, which enables them to complete tasks faster and improve work efficiency, and can switch back and forth between mobile and fixed states, and can also ensure stability during work.

[0042] The plug-in mechanism 6 includes a fixed platform 61, an installation cavity 62, a double-headed motor 63, a transmission groove 64, a lead screw 65, a slide bar 66, a movable plate 67 and an insertion rod 68. The fixed platform 61 is fixedly installed on the top of the first base 1, and the interior of the fixed platform 61 is provided with an installation cavity 62, and the double-headed motor 63 is fixedly installed in the installation cavity 62. Two sets of transmission grooves 64 are opened on the top of the fixed platform 61, and a set of lead screws 65 are rotatably installed between the front and rear inner walls of the two sets of transmission grooves 64. A set of slide bars 66 are fixedly installed between the front and rear inner walls of the two sets of transmission grooves 64. The rotating shaft of the double-headed motor 63 is transmission-connected with the two sets of lead screws 65. A set of movable plates 67 are threadedly installed on the two sets of lead screws 65. The two sets of movable plates 67 are movably sleeved on the corresponding slide bars 66. Two groups of plug rods 68 are fixedly installed on the plate 67, and one ends of the four groups of plug rods 68 pass through the fixed platform 61 and the corresponding main beams 3 and sockets 9. At least two groups of drainage grooves 10 are opened on both sides of the fixed platform 61. Through the coordinated use of the main beam 3, the plug-in mechanism 6 and the socket 9, the main beam 3 on the lifting device 4 and the first base 1 and the second base 2 can be detached. This design is convenient for transportation and installation. The main beam and the base can be manufactured and transported separately, and then assembled on site. Secondly, this design is convenient for maintenance and replacement. If the main beam or the base needs to be repaired or replaced, it can be quickly disassembled and reinstalled. The non-welded design can also extend the service life, reduce the risk of structural deformation and cracks, improve safety, and ensure the use effect of the crane.

[0043] The stabilizing mechanism 7 includes a rectangular groove 71, a through groove 72, a rotating handle 73, a rectangular block 74, a pressure plate 75, a connecting rod 76, a stabilizing plate 77 and a spring 78. A rectangular groove 71 is provided at the bottom of the first base 1, and through grooves 72 are provided on both sides of the first base 1. A rotating handle 73 is rotatably installed at the bottom of the inner side of the through groove 72, and a rectangular block 74 is rotatably installed at the top of the inner side of the rectangular groove 71. The rotating shaft of the rotating handle 73 is transmission-connected with the rectangular block 74. Two groups of pressure plates 75 are provided in the rectangular groove 71, and two groups of connecting rods 76 are fixedly installed on the outer surface of one side of the two groups of pressure plates 75. Two groups of storage grooves are provided at the bottom of the first base 1, and a group of stabilizing plates 77 are provided in the two groups of storage grooves. One end of the four groups of connecting rods 76 penetrates the first base 1 and the corresponding stabilizing plate The plates 77 are fixedly connected, the rectangular block 74 is in conflict with the outer surface of the other side of the two groups of pressure plates 75, and a group of springs 78 are sleeved on the four groups of connecting rods 76. A group of rubber pads 11 are fixedly installed on the bottom of the two groups of stabilizing plates 77. Through the coordinated use of the first base 1, the second base 2 and the stabilizing mechanism 7, before the crane is fixedly installed and used, the overall contact area between the first base 1 and the second base 2 and the ground is further expanded, which can improve the stability and safety of the crane and reduce the risk of overturning and movement. At the same time, this can also reduce the pressure of the crane on the ground and reduce damage and deformation to the ground. In addition, increasing the contact area can also improve the load-bearing capacity and working performance of the crane, making it more stable and reliable, which is conducive to the promotion and use of the crane.

[0044] The control mechanism 8 includes an operating hole 81, a cover plate 82, a handle 83, a control panel 84 and a control button 85. An operating hole 81 is opened on one side of the first base 1, and a cover plate 82 is hingedly installed at the operating hole 81. A handle 83 is fixedly installed on the outer surface of one side of the cover plate 82. A control panel 84 is fixedly installed on the inner wall of the operating hole 81, and at least two groups of control buttons 85 are arranged on the control panel 84.

[0045] Working principle: Before fixed installation and use, first operate the first base 1, and fix it on the ground with bolts through the mounting plate 12, then rotate the handle 73 in the slot 72 to drive the rectangular block 74 to rotate 90 degrees, and the rectangular block 74 presses the two groups of pressure plates 75 on both sides. The two groups of pressure plates 75 extend outward from both sides of the first base 1 through each connecting rod 76 and the two groups of stabilizing plates 77, and each spring 78 is also compressed in a compressed state until the two groups of stabilizing plates 77 are stably supported on the ground on both sides of the first base 1. Then, the same operation can be performed on the second base 2, and then the lifting work can be performed through the lifting device 4. When the crane needs to be moved, the first base 1 is operated first, the bolts of the mounting plate 12 thereon are released, and the handle 73 is turned to reset. Under the rebound effect of each spring 78, the two sets of stabilizing plates 77 are reset, and the cover plate 82 is opened. The control button 85 on the control panel 84 is used to control the free ends of the hydraulic rods 57 in the two sets of strip grooves 56 to extend, driving the top pressure rollers on the two sets of U-shaped mounting frames 58. 59, each presses the two groups of rotating plates 52 to rotate in the corresponding notches 51, and the two groups of rotating plates 52 also rotate around the arc-shaped support rods 55, and each arc-shaped support rod 55 provides auxiliary support for the corresponding rotating plates 52 until the two groups of rotating plates 52 are attached to the corresponding limit plates 510 and reach the limit position. In this process, each universal wheel 54 is attached to the ground to support the first base 1, and the second base 2 is operated in the same way, so that the first base 1 and the second base 2 are supported synchronously. At this time, the crane is transformed into a movable state, and the whole crane is The crane can be moved by itself. When the crane needs to be disassembled, the first base 1 is operated first, and the double-headed motor 63 is controlled to start and drive the two sets of lead screws 65 to rotate synchronously, and drive the two sets of movable plates 67 to move synchronously in the corresponding transmission grooves 64. The various plug rods 68 on the two sets of movable plates 67 are retracted into the corresponding transmission grooves 64, so that the various plug rods 68 no longer penetrate the corresponding main beams 3 and the plug sleeves 9. Then the same operation is performed on the second base 2. At this time, the main beams 3 can be pulled out from the corresponding plug sleeves 9 to achieve disassembly.

[0046] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. The base-adjustable portal crane is characterized by: include: A first base (1); The second base (2) and the first base (1) are each provided with two sets of main beams (3) directly above the second base (2), a lifting device (4) is provided directly above the first base (1), the four sets of main beams (3) are all fixedly mounted on the lifting device (4), the tops of the first base (1) and the second base (2) are each fixedly mounted with two sets of sockets (9), the four sets of main beams (3) are all plugged into corresponding sockets (9); A plug-in mechanism (6) is arranged on the first base (1), and is used to fix each main beam (3) when plugged into the plug sleeve (9); A stabilizing mechanism (7) disposed on the first base (1), the stabilizing mechanism (7) being used to improve the stability of the crane; A control mechanism (8) disposed on the first base (1), the control mechanism (8) being used to control the adjustment of the crane base; A moving mechanism (5) is arranged on the first base (1), the moving mechanism (5) comprising a notch (51), a rotating plate (52), a connecting plate (53), a universal wheel (54) and an arc-shaped support rod (55), the front and rear sides of the first base (1) are each provided with a group of notches (51), a group of rotating plates (52) are rotatably mounted between the inner walls of both sides of the two groups of notches (51), a group of connecting plates (53) are fixedly mounted on the two groups of rotating plates (52), at least two groups of universal wheels (54) are arranged on the two groups of connecting plates (53), at least two groups of arc-shaped support rods (55) are fixedly mounted on the inner walls of the two groups of notches (51), and the two groups of rotating plates (52) are movably sleeved on the corresponding arc-shaped support rods (55); The moving mechanism (5) further comprises a strip groove (56), a hydraulic rod (57), a U-shaped mounting frame (58), a top pressure roller (59) and a limit plate (510). Two groups of strip grooves (56) are provided at the bottom of the first base (1). A group of hydraulic rods (57) are fixedly mounted on the inner walls of the two groups of strip grooves (56). The free ends of the two groups of hydraulic rods (57) penetrate the first base (1) and extend into the corresponding notches (51) and are fixedly mounted with a group of U-shaped mounting frames (58). A group of top pressure rollers (59) are rotatably mounted between the inner walls of both sides of the two groups of U-shaped mounting frames (58). The two groups of top pressure rollers (59) are in contact with the corresponding rotating plates (52). A group of limit plates (510) are fixedly mounted on the front and rear outer surfaces of the first base (1). The plug-in mechanism (6) comprises a fixed platform (61), a mounting cavity (62), a double-headed motor (63), a transmission groove (64), a lead screw (65), a slide rod (66), a movable plate (67) and a plug rod (68); the fixed platform (61) is fixedly mounted on the top of the first base (1); the mounting cavity (62) is provided inside the fixed platform (61); the double-headed motor (63) is fixedly mounted inside the mounting cavity (62); two sets of transmission grooves (64) are provided on the top of the fixed platform (61); the front and rear inner walls of the two sets of transmission grooves (64) are both rotatable. A set of lead screws (65) are installed, a set of slide bars (66) are fixedly installed between the front and rear inner walls of the two sets of transmission grooves (64), the rotating shaft of the double-headed motor (63) is transmission-connected with the two sets of lead screws (65), a set of movable plates (67) are threadedly installed on the two sets of lead screws (65), the two sets of movable plates (67) are movably sleeved on the corresponding slide bars (66), two sets of plug rods (68) are fixedly installed on the two sets of movable plates (67), and one end of the four sets of plug rods (68) passes through the fixed platform (61) and the corresponding main beam (3) and the plug sleeve (9).

2. The base-adjustable portal crane according to claim 1, characterized in that: The stabilizing mechanism (7) comprises a rectangular groove (71), a through groove (72), a rotating handle (73), a rectangular block (74), a pressure plate (75), a connecting rod (76), a stabilizing plate (77) and a spring (78). The bottom of the first base (1) is provided with a rectangular groove (71), and the two sides of the first base (1) are provided with through grooves (72). The rotating handle (73) is rotatably mounted on the bottom of the inner side of the through groove (72), and the rectangular block (74) is rotatably mounted on the top of the inner side of the rectangular groove (71). The rotating shaft of the rotating handle (73) is connected to the rectangular block (74) for transmission. Two groups of pressure plates (75) are arranged in the rectangular groove (71), and two groups of connecting rods (76) are fixedly installed on the outer surfaces of one side of the two groups of pressure plates (75). Two groups of receiving grooves are opened at the bottom of the first base (1), and a group of stabilizing plates (77) are arranged in the two groups of receiving grooves. One end of the four groups of connecting rods (76) passes through the first base (1) and is fixedly connected to the corresponding stabilizing plates (77). The rectangular block (74) contacts the outer surfaces of the other side of the two groups of pressure plates (75), and a group of springs (78) are sleeved on the four groups of connecting rods (76).

3. The base-adjustable portal crane according to claim 2, characterized in that: The control mechanism (8) comprises an operating hole (81), a cover plate (82), a handle (83), a control panel (84) and control buttons (85); an operating hole (81) is provided on one side of the first base (1); a cover plate (82) is hingedly mounted at the operating hole (81); a handle (83) is fixedly mounted on the outer surface of one side of the cover plate (82); a control panel (84) is fixedly mounted on the inner wall of the operating hole (81); and at least two groups of control buttons (85) are arranged on the control panel (84).

4. The base-adjustable portal crane according to claim 3, characterized in that: At least two groups of drainage grooves (10) are provided through both sides of the fixing platform (61).

5. The base-adjustable portal crane according to claim 4, characterized in that: A set of rubber pads (11) are fixedly mounted on the bottom of the two sets of stabilizing plates (77).

6. The base-adjustable portal crane according to claim 5, characterized in that: Two sets of mounting plates (12) are fixedly mounted on both side outer surfaces of the first base (1).

7. The base-adjustable portal crane according to claim 6, characterized in that: A mounting groove is provided on one side of the first base (1), a storage battery is arranged in the mounting groove, a mounting plate (13) is mounted on the mounting groove by means of bolts, and two groups of power signal lights (14) are arranged on one side of the first base (1).

8. The base-adjustable portal crane according to claim 7, characterized in that: The structure on the second base (2) is the same as that on the first base (1).

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