A new type of under-rotating portal crane

Abstract

The utility model relates to the technical field of the lower rotary beam hanging crane, especially to a novel lower rotary beam hanging gantry crane, which comprises a bridge, walking mechanisms arranged on both sides of the bridge, two hoisting mechanisms symmetrically arranged on the top surface of the middle of the bridge, a top beam arranged below the hook in the hoisting mechanism, lug ears symmetrically arranged on the top surface of the top beam, the lug ears connected with the hook of the hoisting mechanism, an electric rotary hook arranged in the middle of the bottom surface of the top beam, a lower beam arranged at the output end of the electric rotary hook, an electromagnetic chuck one symmetrically arranged in the middle of the bottom end of the lower beam, the electromagnetic chuck one fixed on the lower horizontal surface of the lower beam through a chain and a U-shaped connecting piece one, chuck mechanisms capable of being horizontally adjusted symmetrically arranged on both sides of the lower beam, and an auxiliary protection mechanism arranged on the top surface of the chuck mechanism. The utility model has the advantages that the device can adapt to the hoisting of different specifications of plates, the safety and stability during hoisting are improved, the possibility of accidental falling of the plates is reduced, and the device is more practical.

Description

Technical Field

[0001] This utility model relates to the technical field of lower rotating beam gantry cranes, and in particular to a novel lower rotating beam gantry crane. Background Technology

[0002] In operation, current rotary electromagnetic girder bridge cranes utilize a trolley mounted on the main beam to lift the object to be hoisted. The upper end of the outriggers is connected to the main beam, and the lower end is connected to the traveling mechanism. Driven by a motor mounted on the traveling mechanism, the crane moves along the rails. Simultaneously, the trolley can also travel on the main beam, ultimately achieving the effect of moving heavy objects from one location to another. Furthermore, the lifting end of the crane uses an electromagnetic adsorption block. First, the electromagnetic adsorption block is energized to generate attraction, allowing the object to be hoisted to its bottom, thus facilitating subsequent lifting steps.

[0003] The prior art, disclosed in publication number CN218267015U, discloses a rotating electromagnetic girder bridge crane, including a bridge crane body. Two counterweights are slidably connected to the top of the bridge crane body, and connecting rods are fixedly connected to the sides of the two counterweights that are close to each other. Two transmission boxes are fixedly connected to the top of the bridge crane body. This utility model achieves the correction of the center of gravity offset of the bridge crane body through a simple structure, improves the safety of cargo lifting, and can also improve the service life of the bridge crane body.

[0004] However, the existing technology still has certain shortcomings in its use: First, in real life, plates transported by cranes have different lengths, widths, and thicknesses. In the existing technology, the positions of the electromagnetic chucks at both ends are fixed. Therefore, when lifting shorter and thicker plates, the electromagnetic chucks at both ends cannot attract the plates, resulting in insufficient attraction and increasing the risk of the plates falling. Second, since electromagnetic cranes require electricity to operate normally, if a sudden power outage occurs during the lifting and transportation of steel, the electromagnets will lose their attraction to the steel, causing the steel to fall and causing a safety accident. This reduces the safety of the electromagnetic crane beam, so the existing technology needs further improvement. Utility Model Content

[0005] The purpose of this invention is to provide a novel bottom-rotating gantry crane to solve the problems mentioned in the background section.

[0006] This utility model adopts the following technical solution: A novel lower rotating beam gantry crane includes a bridge frame, with traveling mechanisms on both sides of the bridge frame, and two hoisting mechanisms symmetrically arranged on the top surface of the middle of the bridge frame. An upper hanging beam is arranged below the hook in each hoisting mechanism, and lifting lugs are symmetrically arranged on the top surface of the upper hanging beam. The lifting lugs are connected to the hooks of the hoisting mechanisms. An electric rotating hook is arranged in the middle of the bottom surface of the upper hanging beam, and a lower hanging beam is arranged at the output end of the electric rotating hook. An electromagnetic chuck is symmetrically arranged in the middle of the bottom end of the lower hanging beam. The electromagnetic chuck is fixed to the lower horizontal surface of the lower hanging beam by a chain and a U-shaped connector. A horizontally adjustable suction cup mechanism is symmetrically arranged on both sides of the lower hanging beam, and an auxiliary protective mechanism is arranged on the top surface of the suction cup mechanism.

[0007] Optionally, the suction cup mechanism includes an electromagnetic suction cup II, a sliding groove I is provided on the front vertical surface of the lower hanging beam, a lead screw is rotatably installed in the sliding groove I, a receiving groove I is provided on the front vertical surface of the lower hanging beam, a motor is fixedly installed in the receiving groove I, the output end of the motor passes through the receiving groove and the sliding groove I and is fixedly connected to one end of the lead screw, a moving part is provided in the sliding groove I that is threaded with the lead screw, a rectangular groove I is provided on the top surface of both sides of the moving part, a U-shaped connector II is provided on the bottom surface of the rectangular groove I, a number of connectors III are symmetrically arranged on the top surface of the electromagnetic suction cup II, a chain is sleeved on each of the connectors III, and two chains on the left and right are connected to the U-shaped connector II on the same side.

[0008] Optionally, when the chains on electromagnetic chuck one and electromagnetic chuck two are straightened, the bottom surfaces of electromagnetic chuck one and electromagnetic chuck two are on the same horizontal plane.

[0009] Optionally, the auxiliary protective mechanism includes a top plate, the bottom surface of which is provided with a limiting plate with a groove at the bottom. The limiting plate can be inserted into and stabilized on the moving parts on both sides of a rectangular groove. T-shaped connectors are symmetrically provided on the bottom surfaces of both sides of the top plate. A receiving groove is provided on the vertical surface of the T-shaped connector. A hydraulic telescopic cylinder is fixedly installed in the receiving groove. The moving end of the hydraulic telescopic cylinder passes through and slides on the T-shaped connector. A rectangular strip is fixedly installed at the top of the moving end of the hydraulic telescopic cylinder. An L-shaped part is slidably installed in the rectangular strip, and the horizontal section of the L-shaped part faces the electromagnetic chuck. A hydraulic telescopic cylinder is installed on the side of the rectangular strip away from the electromagnetic chuck. The moving end of the hydraulic telescopic cylinder passes through and slides on the side of the rectangular strip and is fixedly connected to the side of the L-shaped part.

[0010] Optionally, when the limiting plate is inserted into the moving part, there is a certain gap between the top plate and the top surface of the lower hanging beam.

[0011] Optionally, two sets of mounting plates are symmetrically arranged in the middle of the bottom surface of the top plate, and several rollers are rotatably arranged between each set of mounting plates. The top surface of the lower beam is symmetrically provided with four sliding grooves corresponding to the positions of the two sets of mounting plates, and the rollers in the two sets of mounting plates roll in the corresponding positions of the four sliding grooves.

[0012] Optionally, reinforcing ribs are provided between the limiting plate and the top plate.

[0013] Optionally, two guide rods are symmetrically arranged on the top surface of the rectangular strip, and the two guide rods pass through and slide on the horizontal sections on both sides of the T-shaped connector.

[0014] Optionally, when the hydraulic telescopic cylinder one is in the fully retracted state, the L-shaped component is higher than the electromagnetic chuck two when the chain is straight.

[0015] Optionally, a limit ring may be provided at the top of the guide post.

[0016] Compared with the prior art, this utility model has the following advantages: 1. In this application, the rotation of the lower beam is achieved by replacing the rotation mechanism in the prior art with an electric rotating hook, which omits the slewing support structure and saves the required cost while satisfying the rotation function of the lower beam.

[0017] 2. In this application, suction cup mechanisms with horizontally adjustable positions are provided at both ends of the lower hanging beam. The suction cup mechanism is driven by a motor to rotate the lead screw, thereby making the moving part horizontally adjusted along the lower hanging beam. In this way, when lifting plates of different specifications (length and thickness), multiple sets of electromagnetic chucks can be used to lift them simultaneously, which improves the adsorption force on the plates, improves the stability of the plates during lifting, improves the safety during the lifting process, and makes it more practical.

[0018] 3. In this application, an auxiliary protective mechanism is also provided on the moving part. The auxiliary protective mechanism includes a top plate that can be inserted and fixed on the moving part. The top plate has vertically adjustable rectangular strips on both sides. The rectangular strips have horizontally adjustable L-shaped parts facing the electromagnetic chuck. Thus, without hindering the electromagnetic chuck from lifting the plate, the L-shaped parts support the bottom of the lifted plate and limit the sides of the plate. This not only prevents the plate from falling directly due to the loss or insufficient magnetic attraction of the electromagnetic chuck caused by a sudden power outage, power failure, or insufficient power supply, thus preventing injury to people or objects on the ground, but also improves safety and reduces the occurrence of safety accidents. It also stabilizes the plate during lifting and prevents the plate from falling accidentally due to positional displacement or misalignment between the plate and the electromagnetic chuck due to inertia or environmental factors. This greatly improves the safety of the plate during lifting and is more practical. It can also adapt to the protection of plates of different specifications (thickness and width).

[0019] 4. In this application, the auxiliary protection mechanism can move along with the moving parts, thus adapting to the protection of plates of different specifications during hoisting, expanding the scope of application of the device.

[0020] 5. In this application, the auxiliary protection mechanism is directly installed on the moving part by means of a limit plate and bolts and nuts, which makes the installation and disassembly of the auxiliary protection mechanism simple and quick.

[0021] 6. In this application, several reinforcing ribs are also provided between the limiting plate and the top plate of the auxiliary protection mechanism. By providing reinforcing ribs, the bending resistance of the top plate can be enhanced, the performance strength of the mechanism can be improved, and the service life of the mechanism can be increased. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the suction cup mechanism of this utility model; Figure 3 This is a schematic diagram of the auxiliary protective structure of this utility model. Figure 1 ; Figure 4 This is a schematic diagram of the auxiliary protective structure of this utility model. Figure 2 .

[0023] In the diagram: 1. Cable tray; 2. Lifting mechanism; 3. Upper hanging beam; 4. Lifting lug; 5. Electric rotating hook; 6. Lower hanging beam; 7. Electromagnetic chuck one; 8. Chuck mechanism; 9. Auxiliary protection mechanism; 10. Electromagnetic chuck two; 11. Slide groove one; 12. Lead screw; 13. Receiving groove one; 14. Motor; 15. Moving part; 16. Rectangular groove one; 17. U-shaped connector two; 18. Connector three; 19. 20. Chain; 21. Top plate; 22. Limiting plate; 23. Groove; 24. T-shaped connector; 25. Receiving groove two; 26. Hydraulic telescopic cylinder one; 27. Rectangular bar; 28. Slide groove two; 29. ​​Slide groove three; 30. L-shaped part; 31. Limiting block; 32. Hydraulic telescopic cylinder two; 33. Mounting plate; 34. Roller; 35. Slide groove four; 36. Reinforcing rib; 37. Guide rod; 38. Limiting ring. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only a part of the embodiments disclosed in this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0025] Various non-limiting embodiments of this utility model are described in detail below. Any number of elements in the accompanying drawings is for illustrative purposes only and not for limitation, and any naming is for distinction only and has no limiting meaning.

[0026] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0027] Please see Figure 1-4 The present invention will now be described in detail with reference to the accompanying drawings and embodiments: A novel lower rotating beam gantry crane includes a bridge frame 1, with traveling mechanisms on both sides of the bridge frame 1. Two hoisting mechanisms 2 are symmetrically arranged on the top surface of the middle of the bridge frame 1. An upper hanging beam 3 is arranged below the hook of the hoisting mechanism 2. Lifting lugs 4 are symmetrically arranged on the top surface of the upper hanging beam 3 and are connected to the hooks of the hoisting mechanisms 2. An electric rotating hook 5 is arranged in the middle of the bottom surface of the upper hanging beam 3. An I-shaped lower hanging beam 6 is fixedly arranged at the output end of the electric rotating hook 5. An electromagnetic chuck 7 is symmetrically arranged in the middle of the bottom end of the lower hanging beam 6. The electromagnetic chuck 7 is fixed to the lower horizontal surface of the lower hanging beam 6 by a chain and a U-shaped connector. A horizontally adjustable suction cup mechanism 8 is symmetrically arranged on both sides of the lower hanging beam 6. An auxiliary protection mechanism 9 is arranged on the top surface of the suction cup mechanism 8.

[0028] The rotation of the lower beam 6 is achieved by replacing the existing rotating mechanism with an electric rotating hook 5, which eliminates the need for a slewing support structure and saves costs while still satisfying the rotation function of the lower beam 6.

[0029] The traveling mechanism, hoisting mechanism 2, electric rotating hook 5, and electromagnetic chuck 7 in the above structure are existing technologies and will not be described in detail here.

[0030] Please see Figure 1-2 The suction cup mechanism 8 includes an electromagnetic suction cup 10. A sliding groove 11 is formed on the front vertical surface of the lower hanging beam 6. A lead screw 12 is rotatably mounted within the sliding groove 11. A receiving groove 13 is formed on the front vertical surface of the lower hanging beam 6. A motor 14 is fixedly mounted within the receiving groove 13. The output end of the motor 14 passes through the receiving groove and the sliding groove 11 and is fixedly connected to one end of the lead screw 12. A moving part 15 is provided within the sliding groove 11. The middle part of the moving part 15 slides within the sliding groove 11 and is threadedly engaged with the lead screw 12. The moving part 15 extends to both sides of the lower hanging beam 6 and slides in contact with the sides of the lower hanging beam 6, improving the moving stability of the moving part 15. Rectangular grooves 16 are provided on the top surfaces of both sides of the moving part 15. U-shaped connectors 17 are fixed to the bottom surfaces of the rectangular grooves 16 by nuts. Four connectors 18 are symmetrically arranged on the top front, back, left, and right sides of the electromagnetic chuck 10. Chains 19 are sleeved on each of the four connectors 18. The two chains 19 arranged on the left and right sides are connected to the U-shaped connectors 17 on the same side. The electromagnetic chuck 10 is existing technology and will not be described in detail here.

[0031] By starting the motor 14 to drive the lead screw 12 to rotate, the lead screw 12 drives the moving part 15 to move horizontally along the slide groove 11, thereby adjusting the position of the electromagnetic chuck 10 so as to pick up and transport plates of different lengths. This ensures that both long and short plates can be picked up and lifted by multiple chucks, ensuring sufficient suction force for each lift, reducing the possibility of plates falling during lift, and improving stability and safety.

[0032] When the chains 19 on electromagnetic chuck 17 and electromagnetic chuck 210 are straightened, the bottom surfaces of electromagnetic chuck 17 and electromagnetic chuck 210 are on the same horizontal plane, which helps to evenly distribute the weight of the plate on multiple chucks, prevents force concentration, and ensures the stability of the plate during movement.

[0033] Please see Figure 3-4 The auxiliary protective mechanism 9 includes a top plate 20. Limiting plates 21 are symmetrically fixed to the bottom of the top plate 20, front and back, and left and right. The bottom of the limiting plates 21 has a groove 22. The limiting plates 21 can be inserted into the movable parts 15 on both sides of the rectangular slot 16 through the groove 22, and the limiting plates 21 can be fixed to the movable parts 15 by bolts and nuts. T-shaped connectors 23 are symmetrically fixed to the bottom of both sides of the top plate 20. A receiving groove 24 is formed on the vertical surface of the T-shaped connector 23. A hydraulic telescopic cylinder 25 is fixedly installed in the receiving groove 24. The moving end of the hydraulic telescopic cylinder 25 passes through and slides on the T-shaped connector 23. A rectangular strip 26 is fixedly installed at the top of the movable end of 25. A second sliding groove 27 is opened through the side of the rectangular strip 26. A third sliding groove 28 is opened on the bottom surface of the second sliding groove 27, which communicates with the bottom of the rectangular strip 26. An L-shaped part 29 is slidably installed in the third sliding groove 28, and the horizontal section of the L-shaped part 29 faces the electromagnetic chuck 20. Limiting blocks 30 are symmetrically arranged on both sides of the top of the L-shaped part 29. The limiting blocks 30 slide in the second sliding groove 27 on both sides. A hydraulic telescopic cylinder 21 is fixedly installed on the side of the rectangular strip 26 away from the electromagnetic chuck 20. The movable end of the hydraulic telescopic cylinder 21 passes through and slides on the side of the rectangular strip 26 and is fixedly connected to the side of the L-shaped part 29.

[0034] By activating the hydraulic telescopic cylinder 25, the horizontal section of the L-shaped component 29 can be moved to the bottom of the plate to support the bottom of the plate during the handling process, preventing the plate from falling due to power failure or insufficient suction force, avoiding harm to the personnel at the bottom or damage to the plate itself, and improving safety.

[0035] By activating the hydraulic telescopic cylinder 31, the distance between the L-shaped parts 29 on both sides can be adjusted. This not only accommodates plates of different widths but also stabilizes the plates during handling, preventing them from shaking, reducing the possibility of them falling, improving safety, and expanding the scope of application.

[0036] When the limiting plate 21 is inserted into the moving part 15, there is a certain distance between the top plate 20 and the top surface of the lower hanging beam 6.

[0037] Please see Figure 3-4 Two sets of mounting plates 32 are symmetrically fixed in the middle of the bottom surface of the top plate 20. Several rollers 33 are rotatably arranged between each set of mounting plates 32. The top surface of the lower hanging beam 6 is symmetrically provided with sliding grooves 34 corresponding to the positions of the two sets of mounting plates 32. The rollers 33 in the two sets of mounting plates 32 roll in the corresponding sliding grooves 34. The arrangement of the rollers 33 and the sliding grooves 34 not only makes the top plate 20 move more smoothly with the moving part 15 and reduces friction, but also improves the stability of the movement.

[0038] Please see Figure 3-4 A reinforcing rib 35 is fixedly provided between the limiting plate 21 and the top plate 20. By setting the reinforcing rib 35, the bending force received by the top plate 20 is reduced, the supporting force of the auxiliary protection mechanism 9 is increased, and the service life of the auxiliary protection mechanism 9 is improved.

[0039] Please see Figure 4 Two guide rods 36 are symmetrically fixed on the top surface of the rectangular strip 26. The two guide rods 36 pass through and slide on the horizontal sections on both sides of the T-shaped connector 23. The setting of the guide rods 36 can not only improve the stability of the movement of the rectangular strip 26, but also enhance the bending resistance.

[0040] When the hydraulic telescopic cylinder 25 is in the fully retracted state, the L-shaped part 29 is higher than the electromagnetic chuck 10 when the chain 19 is in the straightened state.

[0041] Please see Figure 4 A limit ring 37 is provided at the top of the guide column to prevent accidental detachment.

[0042] When the plate needs to be moved or unloaded, firstly, the hook of the hoisting mechanism 2 is raised, so that electromagnetic chuck 1 7 and electromagnetic chuck 2 10 are raised to a certain height. Then, the traveling mechanism is activated to move electromagnetic chuck 1 7 and electromagnetic chuck 2 10 directly above the plate. Next, the hook of the hoisting mechanism 2 is lowered, so that the bottom surface of electromagnetic chuck 1 7 and electromagnetic chuck 2 10 is in full contact with the top surface of the plate. Then, electromagnetic chuck 1 7 and electromagnetic chuck 2 10 are powered on, so that electromagnetic chuck 1 7 and electromagnetic chuck 2 10 adsorb and stabilize the plate. Then, the hook of the hoisting mechanism 2 is raised again, so that the plate is gradually raised to a suitable height.

[0043] After the panel is raised to a certain height, hydraulic telescopic cylinder 25 is activated to extend, so that the horizontal section of L-shaped part 29 is slightly lower than the bottom surface of the panel. Then, hydraulic telescopic cylinder 31 is activated to extend, so that the horizontal section of L-shaped part 29 is directly below the panel and the vertical end of L-shaped part 29 is in contact with the side of the panel. Then, hydraulic telescopic cylinder 25 is activated to retract, so that the top surface of the horizontal section of L-shaped part 29 is in contact with the bottom surface of the panel. This not only provides some support for the bottom surface of the panel, but also prevents the panel from falling off due to power failure or insufficient suction force, thus improving the safety of the panel during movement. In addition, it can limit and stabilize the panel during the handling process, preventing the panel from misaligning and swaying between the panel and the suction cup due to inertia, and ensuring sufficient and stable suction.

[0044] Then, start the walking mechanism to move the plate directly above the desired position. Next, start the lifting mechanism 2 to lower the hook, causing the plate to descend. When the plate is close to the desired placement platform, start the hydraulic telescopic cylinder 31 and hydraulic telescopic cylinder 25 to retract, causing the L-shaped part 29 to leave the plate and release the restriction on the plate. Then, start the lifting mechanism 2 to lower the hook again, so that the plate is stably placed on the placement platform. Finally, turn off the power to the electromagnetic chuck 7 and electromagnetic chuck 10, so that the electromagnetic chuck 7 and electromagnetic chuck 10 release their adsorption effect on the plate. This completes the handling of one plate. Repeat the above actions.

[0045] Based on the above description in this specification, those skilled in the art will also understand that the following terms, such as "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," which indicate orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as a limitation on the present invention.

[0046] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A novel bottom-rotating gantry crane, characterized in that: The cable tray includes a traveling mechanism on both sides. Two lifting mechanisms are symmetrically arranged on the top surface of the cable tray. An upper hanging beam is located below the hook in each lifting mechanism. Lifting lugs are symmetrically arranged on the top surface of the upper hanging beam and are connected to the hooks of the lifting mechanisms. An electric rotating hook is located in the middle of the bottom surface of the upper hanging beam. A lower hanging beam is located at the output end of the electric rotating hook. An electromagnetic chuck is symmetrically arranged in the middle of the bottom end of the lower hanging beam. The electromagnetic chuck is fixed to the lower horizontal surface of the lower hanging beam by a chain and a U-shaped connector. Horizontally adjustable suction cup mechanisms are symmetrically arranged on both sides of the lower hanging beam. An auxiliary protective mechanism is located on the top surface of the suction cup mechanism.

2. The novel lower-rotating hanging beam gantry crane according to claim 1, characterized in that: The suction cup mechanism includes an electromagnetic suction cup II. A slide groove I is provided on the vertical surface of the front side of the lower hanging beam. A lead screw is rotatably installed in the slide groove I. A receiving groove I is provided on the vertical surface of the front side of the lower hanging beam. A motor is fixedly installed in the receiving groove I. The output end of the motor passes through the receiving groove and the slide groove I and is fixedly connected to one end of the lead screw. A moving part that is threaded with the lead screw is provided in the slide groove I. A rectangular groove I is provided on the top surface of both sides of the moving part. A U-shaped connector II is provided on the bottom surface of the rectangular groove I. Several connectors III are symmetrically arranged on the top surface of the electromagnetic suction cup II. A chain is sleeved on each of the several connectors III. The two chains arranged on the left and right are connected to the U-shaped connector II on the same side.

3. The novel lower-rotating suspended beam gantry crane according to claim 2, characterized in that: When the chains on electromagnetic chuck one and electromagnetic chuck two are straightened, the bottom surfaces of electromagnetic chuck one and electromagnetic chuck two are on the same horizontal plane.

4. The novel lower-rotating suspended beam gantry crane according to claim 1, characterized in that: The auxiliary protective mechanism includes a top plate, with a limiting plate having a groove on its bottom surface. The limiting plate can be inserted into and stabilized on the movable parts on both sides of a rectangular groove. T-shaped connectors are symmetrically arranged on the bottom surfaces of both sides of the top plate. A receiving groove is formed on the vertical surface of the T-shaped connector. A hydraulic telescopic cylinder is fixedly installed in the receiving groove. The moving end of the hydraulic telescopic cylinder passes through and slides on the T-shaped connector. A rectangular strip is fixedly installed at the top of the moving end of the hydraulic telescopic cylinder. An L-shaped part is slidably installed in the rectangular strip, with the horizontal section of the L-shaped part facing the electromagnetic chuck. A hydraulic telescopic cylinder is installed on the side of the rectangular strip away from the electromagnetic chuck. The moving end of the hydraulic telescopic cylinder passes through and slides on the side of the rectangular strip and is fixedly connected to the side of the L-shaped part.

5. The novel lower-rotating suspended beam gantry crane according to claim 4, characterized in that: When the limiting plate is inserted into the moving part, there is a certain gap between the top plate and the top surface of the lower hanging beam.

6. The novel lower-rotating suspended beam gantry crane according to claim 5, characterized in that: Two sets of mounting plates are symmetrically arranged in the middle of the bottom surface of the top plate. Several rollers are rotatably arranged between each set of mounting plates. The top surface of the lower beam is symmetrically provided with four sliding grooves corresponding to the positions of the two sets of mounting plates. The rollers in the two sets of mounting plates roll in the corresponding positions of the four sliding grooves.

7. The novel lower-rotating suspended beam gantry crane according to claim 6, characterized in that: Reinforcing ribs are provided between the limiting plate and the top plate.

8. The novel lower-rotating hanging beam gantry crane according to claim 7, characterized in that: Two guide rods are symmetrically arranged on the top surface of the rectangular strip. The two guide rods pass through and slide on the horizontal sections on both sides of the T-shaped connector.

9. The novel lower-rotating hanging beam gantry crane according to claim 8, characterized in that: When the hydraulic telescopic cylinder is fully retracted, the L-shaped component is higher than the electromagnetic chuck in the straightened chain state.

10. The novel lower-rotating hanging beam gantry crane according to claim 9, characterized in that: A limit ring is installed at the top of the guide post.

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