Rubber-tired universal portal crane

Abstract

The invention relates to the technical field of portal cranes, in particular to a rubber-tired universal portal crane. Comprising two lifting devices arranged in a central symmetry mode, two cross beams connected between the two lifting devices and two hoisting parts capable of walking in the length direction of the cross beams, the lower ends of the lifting devices are connected with a moving mechanism, and each lifting device comprises two door-shaped lifting frames rotationally connected to the upper portion of the moving mechanism; the two door-shaped lifting frames can be unfolded in the length direction of the cross beam to form a V shape. When the device is unfolded, the adjacent door-shaped lifting frames of the two lifting devices are in vertical lap joint, the cross beams are separated to form connecting sections and extending sections, one hoisting part is vertically connected between the ends of the two connecting sections, and the connecting sections of the two cross beams are arranged in a Z shape. The crane is convenient to deform, the moving range of goods hoisted by the crane can be effectively extended, meanwhile, the gravity center of equipment is lowered, and stable operation of the equipment is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of gantry cranes, in particular to a tire-type universal gantry crane. Background Art

[0002] Gantry crane is a variation of bridge crane, also called gantry crane. Most gantry cranes on the market are wheel-rail type. When in use, tracks need to be pre-laid, which is greatly affected by the site and very inconvenient. When in use, tire-type gantry crane can move forward according to the hoisting position, which significantly improves convenience.

[0003] When the existing gantry crane is used, the cargo can only be moved on the lower side of the crossbeam, and the lifting range is limited by the length of the gantry crane, which is inconvenient to use. In order to solve the above problem, a gantry crane with a Chinese patent publication number of CN114014168B includes a load-bearing frame, a moving mechanism and an extension mechanism. The lower inner part of the load-bearing frame is provided with a connecting frame, and the upper end of the load-bearing frame is provided with a main beam. The moving mechanism is placed at the bottom of the load-bearing frame, and lighting lamps are provided on both sides of the lower end of the main beam. The device is provided with sub-beams at both ends of the main beam, and the two sub-beams can be driven and unfolded by a folding hydraulic cylinder to extend the lifting range of the equipment.

[0004] However, in this device, the sub-beam is supported only by a folding hydraulic cylinder, and its extension range is small. When the sub-beam is too long, when the cargo is heavy and hoisted to the sub-beam position, the center of gravity of the device will shift, which will affect the overall stability of the device.

[0005] Therefore, the present application provides a tire-mounted universal gantry crane to solve the problems in the prior art of limited lifting range of the gantry crane and unstable center of gravity of the equipment caused by the addition of an extension frame. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a tire-type universal gantry crane.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a tire-type universal gantry crane, comprising two lifting devices arranged symmetrically, two cross beams connected between the two lifting devices and two hoisting parts that can move along the length direction of the cross beams, the lower end of the lifting device is connected to a moving mechanism, the lifting device comprises two lifting frames rotatably connected to the upper part of the moving mechanism, and the two lifting frames can be unfolded in a V shape along the length direction of the cross beam; When the device is deployed, the adjacent lifting frames of the two lifting devices are vertically overlapped, and the cross beams are separated to form a connecting section and an extension section, wherein one of the hoisting parts is vertically connected between the ends of the two connecting sections, so that the connecting sections of the two cross beams are arranged in a Z shape.

[0008] As an optimization, the lifting device includes an outer door-type lifting frame and an inner lifting frame, and the two inner lifting frames are located between the two outer door-type lifting frames. When the device is deployed, the two inner lifting frames are overlapped; A driving motor is connected between the lower end of the outer door-type lifting frame, the lower end of the inner lifting frame and the moving mechanism. The inner lifting frame includes a first lifting rod and a second lifting rod arranged in parallel. The upper end of the first lifting rod can be vertically overlapped with the upper part of the second lifting rod of the other inner lifting frame. The first lifting rod is rotatably connected to the cross beam, and the second lifting rod is arranged in contact with the cross beam.

[0009] As an optimization, a limited telescopic rod is provided on the upper part of the second lifting rod, and a limited hole is provided at the upper end of the first lifting rod; When the device is unfolded, the first lifting rod overlaps with the second lifting rod of another door-type lifting frame, the limiting telescopic rod is extended, and the extended end of the limiting telescopic rod extends into the limiting hole of the first lifting rod that is contacted.

[0010] As an optimization, a positioning hole is provided on the side of the outer door-type lifting frame opposite to the inner lifting frame, and a positioning magnet is provided at the corresponding position of the inner lifting frame. The positioning hole is used to accommodate the positioning magnet. When the device is folded, the outer door-type lifting frame and the inner lifting frame are magnetically connected via the positioning magnet.

[0011] As an optimization, the crossbeam includes a supporting section connected between two lifting devices and an extension section located outside the lifting devices, one end of the supporting section is integrally formed with the extension section, and the other end of the supporting section is detachably connected to the other extension section.

[0012] As an optimization, the upper parts of the outer door-type lifting frame and the inner lifting frame are both provided with connecting seats, and the crossbeam is slidably connected to the connecting seats; The hoisting part is laterally connected between two beams, a locking telescopic rod is arranged at the lower side of the hoisting part, the extended end of the locking telescopic rod passes through the hoisting part and is arranged opposite to the beam, and when the locking telescopic rod is extended, the extended end contacts and presses against the beam.

[0013] As an optimization, an auxiliary limit assembly is connected between the outer door-type lifting frame and the inner lifting frame on the same side of the lifting device; The auxiliary limiting assembly includes a rope collecting motor, a guide buckle and a tightening rope. The rope collecting motor and the guide buckle are respectively arranged on the outside of the outer door-type lifting frame and the outside of the inner lifting frame. One end of the tightening rope is fixedly connected to the rope collecting motor, and the other end of the tightening rope passes through the guide buckle and is connected to the winding shaft of the rope collecting motor. When the device changes from the unfolded state to the retracted state, the tightening rope is tightened by the rope collecting motor.

[0014] As an optimization, a connecting hole is provided on the outer end surface of the supporting section, a connecting rod is provided on the end of the extension section opposite to the supporting section, and the connecting hole is used to accommodate the connecting rod.

[0015] As an optimization, the connecting seat is rotationally connected to the lifting device, and a connecting groove for accommodating the passage of the crossbeam is provided inside the connecting seat. The connecting seat is provided with a positioning telescopic rod, and when the extended end of the positioning telescopic rod is extended, the extended end of the positioning telescopic rod is tightly pressed against the crossbeam.

[0016] As an optimization, the hoisting part includes a hoisting frame and a hoisting rope, the hoisting frame is slidably arranged with the crossbeam, and the lower end of the hoisting rope is connected with a hook; Two auxiliary frames inclined downward are arranged on the lower side of the lifting frame, the lifting rope is located between the two auxiliary frames, and an adjustment rope is connected between the auxiliary frame and the top of the hook. When the hook shakes, the adjustment rope can be tightened to reduce the shaking of the hook.

[0017] The tire-type universal gantry crane of this scheme has the following advantages: When the crane of the present application is used, the lifting device can be expanded outward along the horizontal length direction. When the equipment is expanded, the position of the crossbeam is locked and connected through the lifting part, and the lifting part is connected through the auxiliary limit assembly and the crossbeam to ensure the stability of the crane. The crane of the present application is easy to deform, which can effectively extend the moving range of the crane to lift goods, while lowering the center of gravity of the equipment to ensure the stable operation of the equipment. Ordinary gantry cranes also have a beam structure extending outward, but this type of extended section generally has a lower load-bearing capacity. In this application, since the lifting device is deformed into a triangular support when in the unfolded state, the extended section has a better weighing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a main schematic diagram of the present invention.

[0019] Figure 2 It is a right side schematic diagram of the present invention.

[0020] Figure 3 It is a schematic diagram of the main view of the present invention in the unfolded state.

[0021] Figure 4 It is a top view schematic diagram of the present invention in an unfolded state.

[0022] Figure 5 It is an axial side schematic diagram of the present invention in the unfolded state.

[0023] Figure 6 For the present invention Figure 5 Schematic diagram of the enlarged structure of part A.

[0024] Figure 7 For the present invention Figure 5 Schematic diagram of the enlarged structure of part B.

[0025] Figure 8 It is a schematic diagram of the lower shaft side of the present invention.

[0026] Fig. 9 For the present invention Figure 8 Schematic diagram of the enlarged structure of part C.

[0027] Fig.10 It is a schematic diagram of the back axial side of the present invention.

[0028] Fig.11 For the present invention Fig.10 Schematic diagram of the enlarged structure of part D.

[0029] Fig.12 It is a schematic diagram of the bottom structure of the present invention.

[0030] Fig.13 For the present invention Fig.12 Schematic diagram of the enlarged structure of part E.

[0031] Fig.14 It is an axial schematic diagram of the hoisting part of the present invention.

[0032] Fig.15 It is a bottom axial side schematic diagram of the lifting part of the present invention.

[0033] Fig.16 It is a front view schematic diagram of the hoisting part of the present invention.

[0034] Fig.17 It is a right side schematic diagram of the hoisting part of the present invention.

[0035] Among them, 1. lifting part, 2. moving mechanism, 3. outer door-type lifting frame, 4. inner lifting frame, 5. driving motor, 6. first lifting rod, 7. second lifting rod, 8. limiting telescopic rod, 9. extension section, 10. connecting section, 11. positioning hole, 12. positioning magnetic block, 13. connecting seat, 14. crossbeam, 15. locking telescopic rod, 16. rope collecting motor, 17. guide buckle, 18. tightening rope, 19. connecting hole, 20. connecting rod, 21. positioning telescopic rod, 22. lifting frame, 23. lifting rope, 24. hook, 25. auxiliary frame, 26. adjusting rope, 27. upper guide wheel, 28. lower guide wheel, 29. first adjusting wheel, 30. second adjusting wheel, 31. tensioning telescopic rod, 32. tensioning wheel. DETAILED DESCRIPTION

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They 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 position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0037] like Figure 1-Figure 17 As shown, a tire-type universal gantry crane comprises two lifting devices symmetrically arranged at the center, two cross beams 14 connected between the two lifting devices, and two hoisting parts 1 that can move along the length direction of the cross beams 14, the lower end of the lifting device is connected to a moving mechanism 2, the lifting device comprises two door-type lifting frames rotatably connected to the upper part of the moving mechanism 2, and the two door-type lifting frames can be unfolded in a V shape along the length direction of the cross beam 14; When the device is unfolded, the adjacent door-type lifting frames of the two lifting devices are vertically overlapped, and the cross beam 14 is separated to form a connecting section 10 and an extension section 9, wherein one of the hoisting parts 1 is vertically connected between the ends of the two connecting sections 10, so that the connecting sections 10 of the two cross beams 14 are arranged in a Z shape.

[0038] In normal use, the extension section is located outside the two lifting devices, and the hoisting part 1 can move along the cross beam 14 within the range of the connecting section 10 and the extension section 9. The moving mechanism 2 includes a running tire, which can be a universal wheel or a common running tire.

[0039] like Figure 3 As shown, the lifting device comprises an outer door-type lifting frame 3 and an inner lifting frame 4, and the two inner lifting frames 4 are located between the two outer door-type lifting frames 3. When the device is deployed, the two inner lifting frames 4 are overlapped; A driving motor 5 is connected between the lower end of the outer door-type lifting frame 3, the lower end of the inner lifting frame 4 and the moving mechanism 2. The inner lifting frame 4 includes a first lifting rod 6 and a second lifting rod 7 arranged in parallel. The upper end of the first lifting rod 6 can be vertically overlapped with the upper part of the second lifting rod 7 of the other inner lifting frame 4. The first lifting rod 6 is rotatably connected to the cross beam 14, and the second lifting rod 7 is arranged in contact with the cross beam 14.

[0040] The inner lifting frame 4 can only rotate inward, and the outer door-type lifting frame 3 can only rotate outward. When the inner lifting frame 4 rotates in a direction away from the outer door-type lifting frame 3, the outer door-type lifting frame 3 rotates outward synchronously. In normal use, the second lifting rod 7 contacts the lower side of the cross beam 14, and the second lifting rod 7 is separated from the cross beam 14 in the unfolded state.

[0041] A limiting block is arranged on the upper part of the second lifting rod 7, and the first lifting rod 6 is overlapped on the limiting block, so that the first lifting rod 6 can be quickly positioned by the limiting block.

[0042] like Figure 5 As shown, a limited telescopic rod 8 is provided on the upper part of the second lifting rod 7, and a limited hole is provided at the upper end of the first lifting rod 6; When the device is unfolded, the first lifting rod 6 overlaps with the second lifting rod 7 of the other inner lifting frame 4, the limiting telescopic rod 8 is extended, and the extended end of the limiting telescopic rod 8 extends into the limiting hole of the first lifting rod 6 that is contacted.

[0043] When the first lifting rod 6 is in contact with the limiting block and the second lifting rod 7 , the extended end of the limiting telescopic rod 8 can extend into the limiting hole.

[0044] like Fig.10 As shown, a positioning hole 11 is provided on the side of the outer door-type lifting frame 3 opposite to the inner lifting frame 4, and a positioning magnet 12 is provided at the corresponding position of the inner lifting frame 4. The positioning hole 11 is used to accommodate the positioning magnet 12. When the device is folded, the outer door-type lifting frame 3 and the inner lifting frame 4 are magnetically connected through the positioning magnet 12.

[0045] The positioning magnetic block 12 may also be an electromagnet, which is used to connect the outer door-type lifting frame 3 and the inner lifting frame 4 so that the two can approach each other quickly and maintain a fitting state.

[0046] like Figure 1 As shown, the crossbeam 14 includes a supporting section connected between two lifting devices and an extension section 9 located outside the lifting devices, one end of the supporting section is integrally formed with the extension section 9, and the other end of the supporting section is detachably connected to another extension section 9.

[0047] The connecting section 10 is formed integrally with a supporting section and an extension section 9 . The connecting section 10 and the extension section 9 are detachably connected to form a crossbeam 14 . When the device is unfolded, the connecting section 10 is separated from the extension section 9 .

[0048] like Figure 1 and Figure 7 As shown, the upper parts of the outer door-type lifting frame 3 and the inner lifting frame 4 are both provided with a connecting seat 13, and the cross beam 14 is slidably connected to the connecting seat 13; The hoisting part 1 is laterally connected between two beams 14. A locking telescopic rod 15 is provided on the lower side of the hoisting part 1. The extended end of the locking telescopic rod 15 passes through the hoisting part 1 and is arranged opposite to the beam 14. When the locking telescopic rod 15 is extended, the extended end contacts and presses against the beam 14.

[0049] When the device is unfolded, the cross beam 14 can slide relative to the connecting seat 13 , and limiting protrusions are provided at the ends of the connecting section 10 and the extension section 9 to prevent the cross beam 14 from being disengaged from the connecting seat 13 .

[0050] like Figure 3 and Figure 5 As shown, an auxiliary limiter assembly is connected between the outer door-type lifting frame 3 and the inner lifting frame 4 on the same side of the lifting device; The auxiliary limiting assembly includes a rope collecting motor 16, a guide buckle 17 and a tightening rope 18. The rope collecting motor 16 and the guide buckle 17 are respectively arranged on the outside of the outer door-type lifting frame 3 and the outside of the inner lifting frame 4. One end of the tightening rope 18 is fixedly connected to the rope collecting motor 16, and the other end of the tightening rope 18 is connected to the winding shaft of the rope collecting motor 16 after passing through the guide buckle 17. When the device changes from the unfolded state to the retracted state, the tightening rope 18 is tightened by the rope collecting motor 16.

[0051] When the device is deployed, the cross beam 14 and the connecting seat 13 move relative to each other, and the auxiliary limit assembly operates synchronously to limit the lifting device through the auxiliary limit assembly to prevent the inner lifting frame 4 and the outer door-type lifting frame 3 from opening too quickly. At the same time, the auxiliary limit assembly can also assist the outer door-type lifting frame 3 and the inner lifting frame 4 to reset.

[0052] like Figure 7 As shown, a connecting hole 19 is provided on the outer end surface of the supporting section, and a connecting rod 20 is provided on the end of the extension section 9 opposite to the supporting section, and the connecting hole 19 is used to accommodate the connecting rod 20 .

[0053] The connecting hole 19 and the connecting rod 20 are arranged opposite to each other. When the connecting rod 20 extends into the connecting hole 19, the supporting section and the extending section 9 are butted against each other, and the contact and sealing between the two do not affect the movement of the hoisting part 1.

[0054] like Figure 7 As shown, the connecting seat 13 is rotationally connected to the lifting device, and a connecting groove for accommodating the passage of the cross beam 14 is provided inside the connecting seat 13. The connecting seat 13 is provided with a positioning telescopic rod 21. When the extended end of the positioning telescopic rod 21 is extended, the extended end of the positioning telescopic rod 21 is pressed tightly against the cross beam 14.

[0055] like Figure 14-17As shown, the hoisting part 1 includes a hoisting frame 22 and a hoisting rope 23, the hoisting frame 22 is slidably arranged with the crossbeam 14, and the lower end of the hoisting rope 23 is connected with a hook 24; Two auxiliary frames 25 inclined downward are provided on the lower side of the hanging frame 22, the hanging rope 23 is located between the two auxiliary frames 25, and an adjusting rope 26 is connected between the auxiliary frame 25 and the top of the hanging hook 24. When the hanging hook 24 shakes, the adjusting rope 26 can be tightened to reduce the shaking of the hanging hook 24.

[0056] The two auxiliary frames 25 are symmetrically arranged, and an upper guide wheel 27 and a lower guide wheel 28 are arranged on the inner side of the auxiliary frame 25. A first adjusting wheel 29 and a second adjusting wheel 30 are arranged on the auxiliary frame 25 between the upper guide wheel 27 and the lower guide wheel 28. A tensioning telescopic rod 31 is arranged between the first adjusting wheel 29 and the second adjusting wheel 30. The tensioning telescopic rod 31 is arranged on the outer side of the auxiliary frame 25, and a tensioning wheel 32 is arranged at the extended end of the tensioning telescopic rod 31. One end of the adjustment rope 26 is fixedly connected to the top of the hook 24, and the other end of the adjustment rope 26 passes through the outer side of the auxiliary frame 25 after passing through the upper guide wheel 27 and the first adjusting wheel 29, and returns to the inner side of the auxiliary frame 25 after being guided by the tensioning wheel 32, and is connected to the top of the hook 24 after being guided by the second adjusting wheel 30 and the lower guide wheel 28. When the tensioning telescopic rod 31 is extended, the adjustment rope 26 can be tensioned, and the hook 24 can be pulled to tilt to one side.

[0057] Directions: When this application is used, it has two states: standard state and expanded state; When the length of the crossbeam 14 can meet the lifting range requirements, the device is kept in the standard state, and the goods are lifted by the lifting part 1; When the length of the crossbeam 14 cannot cover the lifting range, the cargo is lifted by the lifting part 1, and then the device is switched from the standard state to the unfolded state. The specific switching steps are as follows: First, the cargo is moved along the lifting direction to the extension section 9; The outer door-type lifting frame 3 is driven to rotate outwards by the driving motor 5, and the inner lifting frame 4 is moved inwards; At the same time, the rope-collecting motor 16 is running, so that the tightening rope 18 is gradually loosened, and the outer door-type lifting frame 3 and the inner lifting frame 4 are synchronously and stably rotated to form a V shape, and a supporting triangle structure is formed between the lifting device and the crossbeam 14; When the inner lifting frame 4 rotates to the right position, the first lifting rod 6 contacts and presses against the second lifting rod 7 of the other inner lifting frame 4, and the limiting telescopic rod 8 extends to lock the first lifting rod 6 and the second lifting rod 7. The first lifting rod 6 and the second lifting rod 7 are arranged to lean against each other in a herringbone shape, and the two lifting devices are arranged symmetrically in the center, and the leaning directions of the two groups of the above-mentioned human-shaped leaning structures are opposite; The positioning telescopic rod 21 is extended to connect the cross beam 14 to the connecting seat 13, the idle hoisting part 1 is moved between the ends of the two connecting sections 10, the locking telescopic rod 15 is extended to connect the hoisting part 1 to the cross beam 14, and the two cross beams 14 are locked by the hoisting part 1; The hoisting part 1 continues to drive the cargo to move along the extension section 9 until the cargo is hoisted to the designated position.

[0058] After the hoisting is completed, the equipment needs to be switched from the unfolded state to the standard state, so that the limiting telescopic rod 8, the positioning telescopic rod 21 and the locking telescopic rod 15 are shortened to release the locked state of the equipment; At the same time, the rope collecting motor 16 is running, and the outer door-type lifting frame 3 and the inner lifting frame 4 are pulled synchronously by the four rope collecting motors 16 to reset the equipment; When the inner lifting frame 4 and the outer door-type lifting frame 3 are in a vertical state, the positioning magnetic block 12 and the positioning hole 11 are relatively engaged, the inner lifting frame 4 and the outer door-type lifting frame 3 are magnetically limited, the connecting section 10 and the extension section 9 are re-connected, and the rope-collecting motor 16 is locked, so that the tightening rope 18 can be tightened.

[0059] In order to prevent the hoisting part 1 from shaking when hoisting goods, the present application sets an auxiliary frame 25 on the lower side of the hoisting frame 22, and sets an adjusting rope 26 between the auxiliary frame 25 and the hook 24. When the hoisting part 1 is accelerated / stopped suddenly, the tensioning telescopic rod 31 of the auxiliary frame 25 on the front / rear side is extended to tighten the adjusting rope 26 on this side, and the lower end of the adjusting rope 26 tightens the hook 24 to prevent the hook 24 from tilting forward / backward.

[0060] At the same time, when the adjustment rope 26 is displaced, it can be adjusted by rotating the first adjustment wheel 29, the second adjustment wheel 30, the upper guide wheel 27 or the lower guide wheel 28, so that the tension of the adjustment rope 26 is stable and the same at all places. Correspondingly, the drive motor 5 can be connected to the axial direction of the first adjustment wheel 29, the second adjustment wheel 30, the upper guide wheel 27 and the lower guide wheel 28. The size, model and installation method of the above structure can be reasonably selected according to the actual load specification of the crane, and will not be repeated here.

[0061] The above-mentioned specific implementation is only a specific case of the present invention. The patent protection scope of the present invention includes but is not limited to the product form and style of the above-mentioned specific implementation. Any tire-type universal gantry crane that conforms to the claims of the present invention and any appropriate changes or modifications made thereto by ordinary technicians in the corresponding technical field shall fall within the patent protection scope of the present invention.

Claims

1. A tire-type universal gantry crane, comprising two lifting devices arranged symmetrically, two cross beams (14) connected between the two lifting devices, and two hoisting parts (1) that can move along the length direction of the cross beams (14), wherein the lower end of the lifting device is connected to a moving mechanism (2), and is characterized in that: The lifting device comprises two lifting frames rotatably connected to the upper part of the moving mechanism (2), and the lifting device can be unfolded in a V shape along the length direction of the crossbeam (14); When the device is deployed, the adjacent lifting frames of the two lifting devices are vertically overlapped, and the cross beam (14) is separated to form a connecting section (10) and an extension section (9), wherein one of the hoisting parts (1) is vertically connected between the ends of the two connecting sections (10), so that the connecting sections (10) of the two cross beams (14) are arranged in a Z shape.

2. A tire-type universal gantry crane according to claim 1, characterized in that: The lifting frame of the lifting device comprises an outer door-type lifting frame (3) and an inner lifting frame (4), wherein the two inner lifting frames (4) are located between the two outer door-type lifting frames (3), and when the device is unfolded, the two inner lifting frames (4) are overlapped; A driving motor (5) is connected between the lower end of the outer door-type lifting frame (3), the lower end of the inner lifting frame (4) and the moving mechanism (2); the inner lifting frame (4) comprises a first lifting rod (6) and a second lifting rod (7) arranged in parallel; the upper end of the first lifting rod (6) can be vertically overlapped with the upper part of the second lifting rod (7) of the other inner lifting frame (4); the first lifting rod (6) is rotatably connected to the cross beam (14); and the second lifting rod (7) is arranged in contact with the cross beam (14).

3. A tire-type universal gantry crane according to claim 2, characterized in that: A limited telescopic rod (8) is provided on the upper part of the second lifting rod (7), and a limited hole is provided on the upper end of the first lifting rod (6); When the device is unfolded, the first lifting rod (6) overlaps with the second lifting rod (7) of another door-type lifting frame, the limiting telescopic rod (8) is extended, and the extended end of the limiting telescopic rod (8) extends into the limiting hole of the first lifting rod (6) that is contacted.

4. A tire-type universal gantry crane according to claim 2, characterized in that: A positioning hole (11) is provided on the side of the outer door-type lifting frame (3) opposite to the inner lifting frame (4), and a positioning magnetic block (12) is provided at a corresponding position of the inner lifting frame (4). The positioning hole (11) is used to accommodate the positioning magnetic block (12). When the device is folded, the outer door-type lifting frame (3) and the inner lifting frame (4) are magnetically connected via the positioning magnetic block (12).

5. The tire-mounted universal gantry crane according to claim 1, characterized in that: The cross beam (14) comprises a supporting section connected between two lifting devices and an extension section (9) located outside the lifting devices, one end of the supporting section is integrally formed with the extension section (9), and the other end of the supporting section is detachably connected to another extension section (9).

6. A tire-type universal gantry crane according to claim 2, characterized in that: A connecting seat (13) is provided on the upper part of the outer door-type lifting frame (3) and the inner lifting frame (4), and the crossbeam (14) is slidably connected to the connecting seat (13); The hoisting part (1) is transversely connected between two cross beams (14); a locking telescopic rod (15) is arranged on the lower side of the hoisting part (1); an extended end of the locking telescopic rod (15) passes through the hoisting part (1) and is arranged opposite to the cross beam (14); when the locking telescopic rod (15) is extended, the extended end contacts and tightly abuts against the cross beam (14).

7. A tire-type universal gantry crane according to claim 2, characterized in that: An auxiliary limiting component is connected between the outer door-type lifting frame (3) and the inner lifting frame (4) on the same side of the lifting device; The auxiliary limiting component comprises a rope collecting motor (16), a guide buckle (17) and a tightening rope (18); the rope collecting motor (16) and the guide buckle (17) are respectively arranged on the outside of the outer door-type lifting frame (3) and the outside of the inner lifting frame (4); one end of the tightening rope (18) is fixedly connected to the rope collecting motor (16); the other end of the tightening rope (18) passes through the guide buckle (17) and is connected to the winding shaft of the rope collecting motor (16); when the device changes from the unfolded state to the retracted state, the tightening rope (18) is tightened by the rope collecting motor (16).

8. The tire-mounted universal gantry crane according to claim 5, characterized in that: The outer end surface of the support section is provided with a connecting hole (19), and the end of the extension section (9) opposite to the support section is provided with a connecting rod (20), and the connecting hole (19) is used to accommodate the connecting rod (20).

9. A tire-type universal gantry crane according to claim 6, characterized in that: The connecting seat (13) is rotatably connected to the lifting device, and a connecting groove for accommodating the passage of the cross beam (14) is provided inside the connecting seat (13). The connecting seat (13) is provided with a positioning telescopic rod (21). When the extended end of the positioning telescopic rod (21) is extended, the extended end of the positioning telescopic rod (21) is tightly pressed against the cross beam (14).

10. The tire-mounted universal gantry crane according to claim 1, characterized in that: The hoisting part (1) comprises a hoisting frame (22) and a hoisting rope (23); the hoisting frame (22) is slidably arranged with the crossbeam (14); and the lower end of the hoisting rope (23) is connected with a hook (24); Two auxiliary frames (25) are arranged at an angle downward on the lower side of the hanging frame (22); the hanging rope (23) is located between the two auxiliary frames (25); an adjusting rope (26) is connected between the auxiliary frame (25) and the top of the hanging hook (24); when the hanging hook (24) shakes, the adjusting rope (26) can be tightened to reduce the shaking of the hanging hook (24).

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