Foldable hoisting device and method of use thereof

Abstract

The application discloses foldable hoisting equipment suitable for fast transportation and narrow space and a use method thereof, and belongs to the technical field of hoisting, and comprises a trolley walking mechanism, door legs and a main beam arranged from bottom to top, the door legs are stacked by a plurality of detachable standard sections, the main beam is transversely arranged between the two door legs and is rotationally connected with the door legs through a rotating mechanism, the main beam comprises a plurality of horizontally foldable beam bodies, folding auxiliary power mechanisms are arranged at end beam bodies connected with the door legs, and the folding auxiliary power mechanisms are matched with the trolley walking mechanism to relatively rotate the beam bodies to realize folding and unfolding of the main beam, the method comprises steps of unfolding the main beam in the folding state, jacking up the main beam, hoisting the equipment, stepwise folding and unfolding the main beam, folding the main beam and the like, the application can quickly and conveniently enter indoor to perform hoisting work, is withdrawn after completing the work task, and can adapt to narrow indoor environment and inconveniently transformed environment.

Description

Technical Field

[0001] This invention relates to the field of lifting and closing equipment technology, specifically to foldable lifting equipment adapted to rapid transportation and narrow spaces, and its method of use. Background Technology

[0002] Currently, existing lifting equipment, especially those used in indoor environments such as factories, typically employs bridge hoists or track-based lifting systems. This conventional approach requires early consideration of a reasonable building and equipment layout, and incurs costs for initial investment, mid-term maintenance, and subsequent modifications. The economic efficiency of large-scale, frequent lifting operations is necessary to justify its cost. However, for work environments with smaller lifting capacities, multiple site transfers, and infrequent use, such as the installation and maintenance of electrical equipment indoors, the conventional approach results in low equipment utilization efficiency, and the assessment and modification of the work environment require additional costs.

[0003] In the prior art, Chinese invention patent application with publication number CN113548579A and publication date of October 26, 2021, entitled "A Foldable Gantry Crane", discloses the following technical solution: A foldable gantry crane relating to the field of crane technology, comprising a folding beam, outriggers, and a lifting device; the folding beam comprises a folding arm I and a folding arm II, one end of the folding arm I and the folding arm II are correspondingly hinged by two hinge shafts I, and the axes of the two hinge shafts I are perpendicular to the axis of the length direction of the folding arm I; the end of the folding arm II corresponding to the folding arm I is provided with a slot that can accommodate the body of the folding arm I when the folding arm I and the folding arm II are folded at the corresponding hinge position; both ends of the folding beam are provided with right-angled pulley seats, the horizontal seat body of the pulley seats is correspondingly hinged to the corresponding end of the folding beam by hinge shaft II, and pins for limiting the deflection of the folding beam along the hinge shaft II are inserted into one side of both ends of the folding beam corresponding to the corresponding hinge shaft II.

[0004] However, the aforementioned folding crane uses a vertically hinged main beam with three hinge points on a straight line. This stress state is not conducive to inward folding, making it time-consuming and labor-intensive. Its folding structure design also results in insufficient span and limited lifting height.

[0005] Therefore, designing an indoor lifting device that can quickly and easily enter indoor spaces for lifting operations and can be retrieved and withdrawn after completing the task can improve equipment utilization efficiency and reduce lifting operation costs. Summary of the Invention

[0006] The present invention aims to solve the above-mentioned problems existing in the prior art, and proposes a foldable lifting device that is suitable for rapid transportation and narrow spaces. At the same time, it proposes a method of using the lifting device. By combining the lifting device and the method, the efficiency of equipment use can be improved and the cost of lifting work can be reduced.

[0007] To achieve the above-mentioned objectives, the technical solution of the present invention is as follows: A foldable lifting device adapted for rapid transportation and confined spaces includes a trolley traveling mechanism, gantry legs, and a main beam arranged from bottom to top. The gantry legs are composed of several detachably connected standard sections stacked together. The main beam spans between two gantry legs and is rotatably connected to them via a rotating mechanism. The main beam comprises multiple horizontally foldable beam segments, and a folding auxiliary power mechanism is provided at the end of the beam segment connected to the gantry leg. This folding auxiliary power mechanism, in conjunction with the trolley traveling mechanism, enables relative rotation between the multiple beam segments to achieve the folding and unfolding of the main beam.

[0008] Furthermore, in one embodiment, the trolley traveling mechanism includes a traveling reduction motor, a steering reduction motor, a gear pair, and a steering wheel; the traveling reduction motor provides traveling power to the steering wheel, the output end of the steering reduction motor is connected to a pinion, the pinion meshes with a large gear connected to the traveling beam to form a gear pair, the steering wheel is rotatably connected below the large gear, and the steering reduction motor drives the pinion to rotate around the large gear to change the direction of the steering wheel.

[0009] Furthermore, in one embodiment, the main beam has a box-shaped beam with a gap in the middle of the lower flange. The main beam includes end beams connected to the portal legs and intermediate beams connected between the end beams. The beams are connected to each other by ear plates and pins.

[0010] Furthermore, in one embodiment, a trolley mechanism is also provided on the main beam, and the internal structure of the beam provides a track surface and guidance for the trolley mechanism to move; the trolley mechanism includes a trolley frame, and a guide structure is provided on the trolley frame. The guide structure cooperates with the gap on the lower flange of the main beam to achieve the guiding function, so that the trolley moves along the span direction in the body of the main beam.

[0011] Furthermore, in one embodiment, the trolley mechanism further includes a travel reduction motor, a gear pair, and wheels; two sets of travel wheels, one in front and one in back, are rotatably connected on the trolley frame. Each set of travel wheels includes a rotating shaft and wheels connected to both ends of the rotating shaft. A drive gear is connected to the output shaft end of the travel reduction motor, and a driven gear is provided on the rotating shaft of one set of travel wheels. The drive gear and the driven gear mesh and transmit power.

[0012] Furthermore, in one embodiment, the standard section is an interchangeable truss structure, and the standard section is provided with a guide device and a flange connection plate for positioning and installation of adjacent upper and lower standard sections. The inner side of the standard section is provided with a lifting lug for connection with the lifting mechanism.

[0013] The present invention also provides a method of using a foldable lifting device adapted to rapid transportation and confined spaces, comprising the following steps based on the aforementioned foldable lifting device: Unfolding the main beam in the folded state: Remove the fixing parts between the beams of the folded main beam, and under the combined action of the trolley traveling mechanism and the auxiliary folding cylinder, the assembly surfaces of the multiple beams are joined together and connected and fixed to each other; Lifting the main beam: Using a lifting mechanism connected to the matching lifting lugs on the standard section, standard sections are added sequentially from below the top section, stacked layer by layer to form the portal leg; Equipment lifting: The trolley traveling mechanism and the trolley mechanism work together to lift and transport heavy objects; Stepping down main beam: The lifting mechanisms on the left and right legs operate simultaneously, disassembling the standard section group one by one, starting from the bottom standard section, until all standard sections are disassembled; Folding main beam: Disassemble the connecting parts between the main beam and the top section, and between the end beam and the middle beam. The trolley traveling mechanism works in conjunction with the auxiliary folding cylinder to drive the beams to rotate relative to each other to achieve folding of the main beam.

[0014] Furthermore, in one embodiment, the step of unfolding the main beam in the folded state includes: 1) Remove the connecting bolts between the main beam and the top section; 2) The steering wheels on the same side of the trolley traveling mechanism turn at the same time and move away from the traveling beam on the other side, which drives the traveling beam to move and stretches the main beam. It stops after being extended to the maximum position. 3) Connect and fix the end beam on one side of the main beam to the adjacent intermediate beam; The auxiliary folding cylinder on the same side is extended to cooperate with the trolley traveling mechanism to push the end beam and the middle beam to engage their mounting surfaces and install the connecting bolts. Control the retraction of the auxiliary folding cylinder on the same side, cooperate with the trolley traveling mechanism, adjust the position of the main beam to be perpendicular to the span direction of the traveling beam, and fix the connection between the beam at the end of this side and the top section; 4) Adjust the end main beam and the middle beam on the other side using the same method as in step 3); 5) Adjust the movement of the trolley traveling mechanism to make the assembly surfaces of the middle main beam join, and install the connecting bolts to complete the main beam unfolding operation.

[0015] Furthermore, in one embodiment, the step of lifting the main beam includes: 1) When the lifting cylinder is lowered to near its minimum stroke, the lifting pressure plate and the matching lifting lugs of the standard section are connected by a pin; 2) The lifting cylinders on both the left and right sides start operating simultaneously and lift to their maximum stroke; 3) Install the new standard section assemblies on the left and right sides. Two standard section parts are used as a set. After positioning the plugs on the end face of the traveling beam, install them. 4) The lifting cylinder slowly retracts its stroke, lowers the upper standard section, and positions and inserts it with the top plug of the new standard section assembly; 5) Repeat steps 1) to 4) above, and use flange connecting plates and bolt connecting pairs to connect and fix the last standard section to the traveling beam to complete the main beam lifting operation.

[0016] Furthermore, in one embodiment, the step-by-step lowering of the main beam includes: 1) When the lifting cylinder is raised to near its maximum stroke, the lifting pressure plate is connected to the matching lifting lug of the next-level standard section to be disassembled by a pin; 2) Disassemble the flange connecting plates and bolt connections at the upper and lower ends of the standard section to be disassembled; 3) The lifting cylinders on both the left and right sides start operating simultaneously and lift to their maximum stroke; 4) Disassemble the standard sections on both the left and right sides; two standard section parts constitute one set. 5) The lifting cylinder slowly retracts its stroke, lowers the upper standard section, and inserts it after positioning it with the plug on the end face of the traveling beam; 6) Repeat steps 1) to 5) above. 7) Connect and fix the top section to the traveling beam with bolts to complete the main beam lowering and lowering operation.

[0017] Furthermore, the folding process of the main beam includes: 1) Remove the connecting bolts between the end beam and the top section, and remove the connecting bolts between one end beam and the middle beam; 2) The auxiliary folding cylinder on the same side drives the main beam to a position perpendicular to the transverse direction of the main beam, and installs the connecting bolts between one side of the main beam and the top section; 3) Remove the connecting bolts between the middle main beams and extend the auxiliary folding cylinder on the other side to its maximum stroke; 4) Remove the connecting bolts between the main beam at the other end and the middle main beam, assist the folding cylinder to work, drive the main beam to move, and install the connecting bolts between the main beam on the same side and the top section; 5) The two steering wheels of the trolley traveling mechanism turn at the same time and move along the direction close to the other traveling beam, driving the traveling beam to retract the main beam, fold it to the smallest position and then stop, completing the main beam folding operation.

[0018] In summary, the present invention has the following advantages: 1. The present invention mainly includes a trolley traveling mechanism, a trolley mechanism, a main beam, a traveling beam, gantry legs, a slewing mechanism, a lifting mechanism and other accessories; it can quickly and conveniently enter the room for lifting work, and can be retrieved and withdrawn after the work is completed, which can improve the efficiency of equipment use and reduce the cost of lifting work, especially suitable for narrow indoor environments that are inconvenient to modify. 2. In this invention, the traveling reduction motor in the trolley traveling mechanism can drive the wheels to move forward and backward, and the steering reduction motor drives the pinion to realize the steering of the steering wheel. All motors are servo motors and are equipped with sensors and encoders. At the same time, the steering mechanism is equipped with a limit device, so that the trolley traveling mechanism has high precision and reliability. 3. In this invention, the trolley mechanism is mainly responsible for lifting heavy objects and adjusting the position of the heavy objects along the span direction of the main beam. The electric hoist is installed on the trolley frame hanging plate, lifting heavy objects and moving with the trolley. The vertical axis reduction motor of the trolley mechanism drives the wheels to rotate through a gear pair. The trolley frame is equipped with a guide structure to allow the trolley to move along the span direction within the main beam. 4. In this invention, the main beam is composed of four foldable beam sections. When folded, the equipment can be transported quickly. When unfolded, it is the main structure for the lifting equipment to bear the load. At the same time, the internal structure of the beam provides a track surface and guidance for the trolley mechanism to move. 4. In this invention, the gate leg is composed of a split and interchangeable truss structure, which occupies less space after disassembly and is easy to transport with the equipment; the gate leg is composed of multiple standard sections, and the standard sections, in conjunction with the lifting mechanism, can realize the step-by-step lifting and lowering of the main beam. 5. This invention allows for quick and convenient entry into indoor environments for lifting operations. After completing the task, it can be retrieved and transported to other work sites for reuse, which is of great significance for improving equipment efficiency and reducing lifting costs. Attached Figure Description

[0019] Figure 1 This is a front view of the lifting device of the present invention; Figure 2 This is a side view of the structure of the lifting device of the present invention; Figure 3 This is a top view of the lifting device of the present invention; Figure 4 This is a front view of the present invention in its folded transport state; Figure 5 This is a side view of the present invention in its folded transport state; Figure 6 This is a top view of the present invention in its folded transport state; Figure 7 This is a schematic diagram of the structure of the trolley traveling mechanism; Figure 8 This is a schematic diagram of the overall structure of the trolley mechanism; Figure 9 This is a structural side view of the trolley mechanism; Figure 10 A structural side view of the main beam; Figure 11 Top view of the main beam structure; Figure 12 A schematic diagram of the longitudinal section of the main beam; Figure 13 This is a schematic diagram of the overall structure of a standard section; Figure 14 This is a structural side view of a standard section; Figure 15 This is a top view of the standard section structure; Figures 16 to 19 This is a schematic diagram of the main beam unfolding process; Figures 20 to 22 This is a schematic diagram of the main beam folding process; Figure 23 This is a top view of the trolley mechanism. In the picture: 1. Trolley traveling mechanism; 2. Traveling beam; 3. Door leg; 4. Main beam; 5. Trolley mechanism; 6. Slewing mechanism; 7. Lifting mechanism; 101. Traveling geared motor; 102. Steering geared motor; 103. Large gear; 104. Steering wheel; 105. Small gear; 301. Standard section; 302. Guide device; 303. Lifting lug; 304. Flange connecting plate; 401. End beam; 402. Intermediate beam; 403. Bolt pair; 404. Pin shaft; 405. Lower wing plate; 501. Trolley frame; 502. Vertical axis geared motor; 503. Wheel; 504. Electric hoist; 505. Lifting plate; 506. Driven gear; 507. Guide structure; 508. Driving gear; 509. Vertical plate; 510. Connecting plate; 511. Bearing; 512. Rotating shaft. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this invention, it should be noted that the terms "upper," "vertical," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Example 1 This invention provides, for example Figure 1-3 The foldable lifting equipment shown is adapted for rapid transportation and narrow spaces, including a trolley traveling mechanism 1, a trolley mechanism 5, a main beam 4, a traveling beam 2, a gantry leg 3, a slewing mechanism 6, and a lifting mechanism 7.

[0026] The trolley traveling mechanism 1 is located at the bottom of the entire lifting equipment. It is mainly responsible for the movement of the lifting equipment and for assisting the main beam 4 in switching between unfolded and folded states.

[0027] The trolley traveling mechanism 1 includes a traveling geared motor 101, a steering geared motor 102, a gear pair, and a steering wheel 104. The traveling geared motor 101 drives the steering wheel 104 forward and backward, while the steering geared motor 102 enables the steering wheel 104 to turn. Both geared motors are servo motors and are equipped with sensors and encoders. The steering mechanism has limit devices, ensuring high precision and reliability for the trolley traveling mechanism 1. More specifically, such as... Figure 7 As shown, the output end of the steering reduction motor 102 is connected to a small gear 105. The small gear 105 meshes with the large gear 103 fixedly connected to the traveling beam 2 to form a gear pair. The steering wheel 104 is rotatably connected below the large gear 103. The steering reduction motor 102 drives the small gear 105 to rotate around the large gear 103, thereby changing the direction of the steering wheel 104.

[0028] Above the traveling mechanism 1, traveling beams 2 are connected, and above the traveling beams 2, door legs 3 are connected. A main beam 4 spans between the two door legs 3, and its two ends are rotatably connected to the top of the door legs 3 via a slewing mechanism 6, which can be activated by a rotating shaft. The main beam 4 and the door legs 3 are fixedly connected by bolts. An auxiliary folding cylinder is installed on each door leg 3, with its cylinder barrel fixedly connected to the door leg 3, and the end of the telescopic rod connected to the main beam 4.

[0029] like Figure 10 and Figure 11 As shown, the main beam 4 comprises multiple horizontally foldable beam segments. Specifically, the main beam 4 can be further divided into end beams 401 connected to the portal legs 3 and intermediate beams 402 connecting the two end beams 401. The intermediate beams 402 are connected by ear plates and pins 404, while the end beams 401 are connected to the portal legs 3 and other components via a slewing mechanism 6. The main beam 4 is moved by the trolley traveling mechanism 1 and auxiliary folding cylinders mounted on the portal legs 3, enabling relative rotation between the multiple beam segments. When the end faces of each beam segment are aligned, bolts 403 can be used to fix the two beam segments into a single structure. In the folded state, the entire lifting equipment can be transported quickly; in the unfolded state, it serves as the main load-bearing structure of the lifting equipment.

[0030] In this embodiment, the telescopic rod of the auxiliary folding cylinder is connected to the end beam 401, and moves in conjunction with the trolley traveling mechanism 1 to realize the folding and unfolding of the main beam 4.

[0031] Example 2 This embodiment provides a foldable lifting device suitable for rapid transportation and confined spaces. Building upon Embodiment 1, the internal structure of the beam further provides a track surface and guide for the movement of the trolley mechanism 5. For example... Figure 12 As shown, the cross-section of the main beam 4 is a box girder with a gap in the middle of the lower flange 405.

[0032] like Figure 1 As shown, the trolley mechanism 5 is installed on the main beam 4 and can move along the span direction of the main beam 4.

[0033] like Figure 8 and Figure 9 As shown, the trolley mechanism 5 includes a trolley frame 501, a vertical axis reduction motor 502, a gear pair, and wheels 503. Two sets of traveling wheels are rotatably connected to the trolley frame 501. These two sets of traveling wheels are arranged one in front of the other. Each set of traveling wheels includes a rotating axle and wheels 503 connected to both ends of the rotating axle. Bearings are provided on the trolley frame 501 at the positions through which the rotating axle passes, and the rotating axle is rotatably connected to the bearings.

[0034] like Figure 23As shown, the trolley frame 501 includes two opposing parallel upright plates 509, which are fixedly connected together by a connecting plate 510. A vertical axis reduction motor 502 is located inside the trolley frame 501, between the two upright plates 509, and fixed to the connecting plate 510. A drive gear 508 is connected to the output shaft of the vertical axis reduction motor 502, and a driven gear 506 is provided on the shaft 512 of one set of traveling wheels. The driven gear 506 is coaxially and fixedly connected to the shaft 512. Both the driven gear 506 and the drive gear are bevel gears, with their axes perpendicular and meshing with each other, forming a gear pair that provides power to the wheels 503 through meshing transmission. Simultaneously, the meshing transmission arrangement of the bevel gears reduces the length of the trolley, making the trolley frame 501 more compact.

[0035] To save installation space, the vertical axis geared motor 502 adopts a vertical axis reducer, with its motor output shaft direction parallel to the trolley's travel direction and the motor end perpendicular to the output shaft and pointing vertically upward, saving space on both sides of the trolley's movement direction.

[0036] The trolley mechanism 5 is mounted on the main beam 4, and the internal structure of the beam provides the track surface and guide for the movement of the trolley mechanism 5. Different lifting methods and guide structures 507 can be installed below the trolley mechanism 5 according to different usage conditions.

[0037] Refer to the instruction manual appendix Figure 9 A guide structure 507 is provided below the trolley frame 501, which matches the shape of the notch on the lower flange 405 of the main beam 4. Two sets of traveling wheels are located on the side rails of the lower flange 405 inside the main beam 4, and travel along the span direction of the main beam 4 under the action of the vertical axis reduction motor 502; while the guide structure 507 passes through the notch on the lower flange 405 of the main beam 4, so that the trolley mechanism 5 plays a guiding role when moving on the beam.

[0038] A lifting plate 505 is fixedly installed below the trolley frame 501. The lifting plate 505 can be connected to a lifting device such as an electric hoist 504 to lift heavy objects.

[0039] Example 3 This embodiment provides a foldable lifting device suitable for rapid transportation and confined spaces. Based on Embodiment 1 or 2, the gate leg 3 is composed of several modular and interchangeable truss structures, occupying less space after disassembly and facilitating transportation with the equipment. In this embodiment, the gate leg 3 mainly includes multiple standard sections 301, which are stacked to form the gate leg 3. The topmost standard section 301 is connected to the main beam 4 and is called the top section, whose structure is slightly different from that of the standard section 301. Each standard section 301 is welded from steel pipes and is equipped with a guide device 302 and a flange connection plate 304 for positioning and installing adjacent upper and lower standard sections 301. The inner side of the standard section 301 is provided with a lifting lug 303, which is used to connect with the lifting mechanism 7. By lifting step by step and installing new standard sections 301, the main beam 4 can be raised in stages.

[0040] like Figure 13-15 The diagram shows the structure of standard section 301. Each layer contains two standard sections 301, and the two standard sections 301 constitute a standard section 301 group. The standard sections 301 on the same layer are fixedly connected together by bolt pairs. Several guide devices 302 and flange connecting plates 304 are provided at the joint of the upper and lower standard section 301 groups. The guide devices 302 achieve positioning and docking in the form of hole-shaft cooperation, and the upper and lower standard sections 301 are connected together by bolt pairs passing through the flange connecting plates 304.

[0041] Example 4 Based on the aforementioned foldable lifting equipment, this embodiment provides a method for using the lifting equipment that is suitable for rapid transportation and confined spaces. This method uses a typical foldable main beam 4 structure composed of four beam segments to illustrate the implementation method, which includes the following steps: 1. The main beam 4 unfolds from its folded state. 1) First, remove the connecting bolts between the main beam 4 and the top section of the door leg 3.

[0042] 2) The steering wheels 104 on both sides of the trolley traveling mechanism 1 simultaneously rotate 90° and move away from the traveling beam 2 on the other side, driving the traveling beam 2 on the rotating side to move and thus stretch the main beam 4, so that the main beam 4 is stretched to its maximum length position (this is the maximum position of the main beam 4 stretched only by the trolley traveling mechanism 1, and the beam segments are not fully stretched into a straight line due to the included angles between them), and then stops, as shown in the attached figure. Figure 16-19 As shown.

[0043] 3) Connect and fix the end beam 401 on one side to the middle beam 402.

[0044] During operation, the auxiliary folding cylinder on the same side extends (at this time, the trolley traveling mechanism 1 on the same side moves in coordination with the folding cylinder), pushing and adjusting until the end beam 401 and the assembly surface (end face) of the middle section beam are engaged, and the connecting bolts are installed, as shown in the attached figure. Figure 17 As shown in region A; Next, control the retraction of the auxiliary folding cylinder on the same side (at this time, the trolley traveling mechanism 1 on the same side moves in coordination with the folding cylinder), adjust the position of the main beam 4 to be perpendicular to the span direction of the traveling beam 2, and install the connecting bolts between the main beam 4 and the top section, as shown in the attached diagram. Figure 18 As shown in region B.

[0045] 4) Connect and fix the other end beam 401 to the middle beam 402. The operating principle and method are the same as in step 3). For specific steps, refer to "Connect and fix the other end beam 401 to the middle beam 402".

[0046] The end beam 401 on this side is connected and fixed to the middle beam 402.

[0047] During the aforementioned unfolding process of the main beam 4, a supporting structure can be added in the middle of the main beam 4 to complete the task.

[0048] 5) Adjust the movement of the trolley traveling mechanism 1 to align the assembly surfaces of the intermediate beam 402 and insert the connecting bolts, as shown in the attached diagram. Figure 19 As shown in area A, the main beam 4 has been unfolded.

[0049] II. Lifting the main beam 4 in the unfolded state 1) First, lower the lifting cylinder in the lifting mechanism 7 to its minimum stroke, and connect the lifting pressure plate and the matching lifting lug 303 of the standard section 301 with a pin; 2) The lifting cylinders on both the left and right sides start operating simultaneously, lifting to the maximum stroke; 3) Install the new standard section 301 on the left and right sides, and install it after positioning and connecting it with the plug on the end face of the traveling beam 2; 4) The lifting cylinder slowly retracts its stroke, lowering the upper standard section 301 and positioning it with the top plug that was previously installed in the standard section 301. 5) Connect the two standard sections 301 into one piece using flange connecting plate 304 and bolt connecting pair; Repeat steps 1) to 5) above until the last standard section 301 is connected and fixed to the traveling beam 2 using the flange connecting plate 304 and bolt connection pair, thus completing the main beam 4 lifting operation.

[0050] III. Equipment Lifting 1) The four steering wheels 104 of the trolley traveling mechanism can adjust their direction and travel synchronously within a 90° range to the left and right.

[0051] 2) The trolley mechanism 5 lifts the heavy object and moves along the span of the main beam 4.

[0052] IV. Step-down main beam 4 1) When the lifting cylinder is raised to near its maximum stroke, the lifting pressure plate is connected to the matching lifting lug 303 of the upper standard section 301 of the standard section 301 to be disassembled by the pin.

[0053] 2) Remove the flange connecting plates 304 and bolt connections at the upper and lower ends of the standard section 301 to be disassembled.

[0054] 3) The lifting cylinders on both the left and right sides start running simultaneously and lift to the maximum stroke.

[0055] 4) Disassemble the standard section 301 sets on both the left and right sides. Two standard section 301 parts constitute one set.

[0056] 5) The lifting cylinder slowly retracts its stroke, lowers the upper standard section 301, and inserts it after positioning it with the plug on the end face of the traveling beam 2.

[0057] 6) Repeat steps 1) to 5) above until the top section is connected and fixed to the traveling beam 2 with bolts, and the main beam 4 is lowered and retracted.

[0058] V. Folded Main Beam 4 1) Remove the connecting bolts between the end beams 401 on both sides and the top section (see attached document). Figure 20 (Areas A and B), remove the connecting bolts between the right end beam 401 and the middle beam 402 (see attached document). Figure 20 (Central C area). The right auxiliary folding cylinder operates (the right trolley traveling mechanism 1 moves in coordination with the folding cylinder), driving the main beam 4 to move to the auxiliary... Figure 20 The position shown indicates that the right end beam 401 is parallel to the traveling beam 2 on that side, and the connecting bolts between the right end beam 401 and the top section are installed (see attached image). Figure 20 (Region A, China)

[0059] 2) Remove the connecting bolts between the intermediate beams 402 (see attached document). Figure 21 (Area A), and extend the left auxiliary folding cylinder to its maximum stroke (the left trolley traveling mechanism 1 moves in coordination with the folding cylinder), as shown in the attached figure. Figure 21 As shown.

[0060] 3) Remove the connecting bolts between the left end beam 401 and the middle beam 402 (see attached document). Figure 22 (In area A), the left auxiliary folding cylinder operates (the left trolley traveling mechanism 1 moves in coordination with the folding cylinder), driving the main beam 4 to move to the auxiliary... Figure 22 The indicated position is where the left end beam 401 is parallel to the traveling beam 2 on that side, and the connecting bolts between the left main beam 4 and the top section are installed (see attached image). Figure 22 (Central B area).

[0061] 4) The steering wheel 104 on the same side of the trolley traveling mechanism 1 simultaneously turns 90° towards the side where the traveling beam 2 is located, and moves towards the traveling beam 2, driving the traveling beam 2 to retract the main beam 4, folding it to the smallest position (at this time, the end faces of each beam segment are in contact), and then stops, completing the folding operation of the main beam 4. The final folded effect is as follows: Figure 4-6 As shown.

[0062] In the above implementation scheme, both the auxiliary folding cylinder and the lifting cylinder are powered by a pump station.

[0063] Although specific embodiments of the present invention have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A foldable lifting device adapted for rapid transportation and confined spaces, comprising a trolley traveling mechanism (1), gantry legs (3), and a main beam (4) arranged from bottom to top, characterized in that, The door leg (3) is composed of several detachably connected standard sections (301) stacked together; the main beam (4) spans between the two door legs (3) and is rotatably connected to the door legs (3) through a rotating mechanism (6); the main beam (4) includes multiple horizontally foldable beam sections, and a folding auxiliary power mechanism is provided at the end beam (401) connected to the door leg (3). The folding auxiliary power mechanism, in conjunction with the trolley traveling mechanism (1), enables the multiple beam sections to rotate relative to each other to achieve the folding and unfolding of the main beam (4); the cross section of the main beam (4) is a lower flange (405). The box girder with a gap in the middle, the main beam (4) includes the end beam (401) connected to the top section of the door leg (3) and the intermediate beam (402) connected between the end beams (401). The beams are connected by ear plates and pins. The standard section (301) is an interchangeable truss structure. The standard section (301) is equipped with a guide device (302) and a flange connection plate (304) for positioning and installation of adjacent upper and lower standard sections (301). The inner side of the standard section (301) is equipped with a lifting lug (303) for connecting and cooperating with the lifting mechanism (7) for lifting.

2. The foldable lifting device adapted to rapid transportation and confined spaces according to claim 1, characterized in that, The trolley traveling mechanism (1) includes a traveling speed reduction motor (101), a steering speed reduction motor (102), a gear pair and a steering wheel (104); the traveling speed reduction motor (101) provides traveling power to the steering wheel (104), the output end of the steering speed reduction motor (102) is connected to a small gear (105), the small gear (105) meshes with a large gear (103) connected to the traveling beam (2) to form a gear pair, the steering wheel (104) is rotatably connected below the large gear (103), the steering speed reduction motor (102) drives the small gear (105) to rotate around the large gear (103) to change the direction of the steering wheel (104).

3. A foldable lifting device adapted to rapid transportation and confined spaces according to claim 1, characterized in that, The main beam (4) is also equipped with a trolley mechanism (5). The internal structure of the beam provides a track surface and guide for the trolley mechanism (5) to move. The trolley mechanism (5) includes a trolley frame (501). A guide structure (507) is provided on the trolley frame (501). The guide structure (507) cooperates with the gap on the lower flange (405) of the main beam (4) to achieve the guiding function, so that the trolley moves along the span direction in the main beam (4).

4. A foldable lifting device adapted to rapid transportation and confined spaces according to claim 3, characterized in that, The trolley mechanism (5) also includes a travel reduction motor (101), a gear pair and wheels (503); two sets of travel wheels are rotatably connected on the trolley frame (501), each set of travel wheels includes a shaft (512) and wheels (503) connected to both ends of the shaft. A drive gear (508) is connected to the output shaft end of the travel reduction motor (101), and a driven gear (506) is provided on the shaft (512) of one set of travel wheels. The drive gear (508) meshes with the driven gear (506) to achieve transmission.

5. A method of using a foldable lifting device adapted for rapid transportation and confined spaces, based on the device according to any one of claims 1-4, characterized in that, Includes the following steps: Unfolding the main beam (4) in the folded state: Remove the fixing parts between the beams of the folded main beam (4), and under the combined action of the trolley traveling mechanism (1) and the auxiliary folding cylinder, the assembly surfaces of the multiple beams are joined together and connected and fixed to each other; Lifting main beam (4): Use the lifting mechanism (7) to connect with the matching lifting lugs (303) on the standard section (301), and add standard sections (301) in sequence from below the top section to form the door leg (3). Equipment lifting: The trolley traveling mechanism (1) and the trolley mechanism (5) work together to lift and transport heavy objects; Step-down main beam (4): The lifting mechanism (7) on the left and right legs (3) operates simultaneously, starting from the bottom standard section (301) and disassembling the standard section (301) group one by one until all standard sections (301) are disassembled; Folding main beam (4): Disassemble the connecting parts between the main beam (4) and the top section, and between the end beam (401) and the middle beam (402). The trolley traveling mechanism (1) cooperates with the auxiliary folding cylinder to drive the beams to rotate and realize the folding of the main beam (4).

6. The method of using a foldable lifting device according to claim 5, characterized in that, The unfolding steps of the main beam (4) in its folded state include: 1) Remove the connecting bolts between the main beam (4) and the top section; 2) The steering wheel (104) on the same side of the traveling mechanism (1) turns at the same time and moves away from the traveling beam (2) on the other side, which drives the traveling beam (2) to move while stretching the main beam (4) and stops after unfolding to the maximum position; 3) Connect and fix the end beam (401) on one side of the main beam (4) to the adjacent intermediate beam (402); The auxiliary folding cylinder on the same side is extended, and in coordination with the trolley traveling mechanism (1), the end beam (401) and the middle beam (402) are joined together, and the connecting bolts are installed. Control the retraction of the auxiliary folding cylinder on the same side, cooperate with the trolley traveling mechanism (1), adjust the position of the main beam (4) to be perpendicular to the span direction of the traveling beam (2), and fix the connection between the beam body (401) at the end of this side and the top section; 4) Adjust the end main beam (4) and the middle beam (402) on the other side using the same method as in step 3). 5) Adjust the movement of the trolley traveling mechanism (1) to make the assembly surface of the middle main beam (4) join, and install the connecting bolts to complete the unfolding operation of the main beam (4).

7. The method of using a foldable lifting device according to claim 5, characterized in that, The steps for lifting the main beam (4) include: 1) The lifting cylinder is lowered to near its minimum stroke, and the lifting pressure plate is connected to the matching lifting lug (303) of the standard section (301) by a pin. 2) The lifting cylinders on both the left and right sides start operating simultaneously and lift to their maximum stroke; 3) Install the new standard section (301) group on the left and right sides. Two standard section (301) parts are a group. After positioning with the plug on the end face of the traveling beam (2), install them. 4) The lifting cylinder slowly retracts its stroke, lowers the upper standard section (301), and positions and inserts the top plug of the new standard section (301) into place; 5) Repeat steps 1) to 4) above, and use flange connecting plate (304) and bolt connecting pair to connect and fix the last standard section (301) group to the walking beam (2) to complete the lifting operation of the main beam (4).

8. The method of using a foldable lifting device according to claim 5, characterized in that, The steps of the step-down main beam (4) include: 1) When the lifting cylinder is raised to near its maximum stroke, the lifting pressure plate is connected to the matching lifting lug (303) of the upper standard section (301) of the standard section to be disassembled (301) by a pin. 2) Disassemble the flange connecting plates (304) and bolt connection pairs at the upper and lower ends of the standard section (301) to be disassembled; 3) The lifting cylinders on both the left and right sides start operating simultaneously and lift to their maximum stroke; 4) Disassemble the standard sections (301) on both sides. Two standard section (301) parts form a set. 5) The lifting cylinder slowly retracts its stroke, lowers the upper standard section (301), and is then installed after being positioned with the plug on the end face of the traveling beam (2); 6) Repeat steps 1) to 5) above. 7) Use bolts to connect and fix the top section to the traveling beam (2) to complete the lowering and lowering operation of the main beam (4).

9. The method of using a foldable lifting device according to claim 5, characterized in that, The process of folding the main beam (4) includes: 1) Remove the connecting bolts between the end beam (401) and the top section, and remove the connecting bolts between one end beam (401) and the middle beam (402); 2) The auxiliary folding cylinder on the same side drives the main beam (4) to move to a position perpendicular to the transverse direction of the main beam (4), and installs the connecting bolts between the main beam (4) on one side and the top section; 3) Remove the connecting bolts between the middle main beams (4) and extend the auxiliary folding cylinder on the other side to its maximum stroke; 4) Remove the connecting bolts between the other end main beam (4) and the middle main beam (4), and the auxiliary folding cylinder on this side will work to drive the main beam (4) to move and install the connecting bolts between the main beam (4) on this side and the top section; 5) The two steering wheels (104) of the trolley traveling mechanism (1) turn at the same time and move along the direction close to the other side traveling beam (2), driving the traveling beam (2) to retract the main beam (4), folding until the end faces of each beam section are in contact and then stopping, completing the folding operation of the main beam (4).

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