Gantry crane folding arm linkage device

Abstract

The utility model provides a gantry crane folding arm linkage device which comprises a moving device and a locking device, the two ends of the moving device are connected to the inner sides of a fixed beam and a cantilever beam of a gantry respectively, the locking device is connected to the outer side of the fixed beam of the gantry, the fixed beam is fixedly connected with a connecting part of the gantry, and the connecting part is hinged to the cantilever beam through a rotating shaft. The moving device comprises a first driving part, the two ends of the first driving part are rotationally connected with the fixed beam and the cantilever beam respectively, the locking device comprises a second driving part and a pin shaft, the output end of the second driving part is connected with the pin shaft through a locking part, and the first driving part drives the cantilever beam to rotate outwards in the horizontal direction in the plane where the fixed beam is located. After the cantilever beam rotates to be flush with the fixed beam, the pin shaft is driven by the second driving piece to be inserted into the first mounting base arranged on the outer side of the connecting part and the first lug plate arranged on the outer side of the cantilever beam, the traveling distance of the traveling crane can be extended, and therefore the traveling crane can conveniently hoist a container to the shore, and the operation requirement is met.

Description

Technical Field

[0001] The utility model relates to the technical field of cranes, in particular to a folding arm linkage device for a gantry crane. Background Art

[0002] With the rapid development of various industries, the crane industry provides a broad market for the transportation industry. Among lifting machinery and equipment, gantry cranes are a type of lifting equipment commonly used for transporting containers in ports and inland terminals. They are a type of bridge crane. Their structure is similar to a door-shaped frame, mainly including a gantry and a crane. A fixed beam is provided on the gantry for the crane to move, thereby performing lifting operations on container cargo.

[0003] For example, the patent document with Chinese patent number 202321293785.7 and announcement date 2023.06.27 discloses a new type of container gantry crane, including two parallel horizontal beams, two parallel longitudinal beams mounted on the two horizontal beams, and a lifting trolley mounted on the two longitudinal beams. Support legs are fixedly installed on both sides of the two horizontal beams, and several temporary storage mechanisms are installed between the two support legs on the same side. The temporary storage mechanisms are respectively provided with a container fixing mechanism and a sliding mechanism.

[0004] Under the premise of considering the navigation safety of the hull, the length of the fixed beam cannot exceed the width of the hull. At this time, the lateral operating range of the crane is limited to the width of the hull. After the ship docks, in order to meet the needs of lifting containers for loading or unloading to the shore, it is necessary to set a retractable and foldable cantilever beam on the fixed beam. This can extend the travel distance of the crane to the shore to facilitate the loading and unloading of ships and cargo. However, in the gantry crane of the above-mentioned document, the two ends of the beam are fixed structures and cannot be extended, and thus the travel distance of the lifting trolley cannot be extended, which fails to meet the operational requirements. If folding is achieved by hinged connection through multiple split fixed beams, this method cannot ensure the stability of the connection at the hinge after unfolding, and thus cannot ensure the reliability of the entire device. Utility Model Content

[0005] The purpose of the utility model is to provide a gantry crane folding arm linkage device, which can extend the traveling distance of the crane through a foldable cantilever beam, thereby facilitating the crane to lift containers to the shore, meeting operational requirements, with high reliability and simple operation.

[0006] The cam is connected to the cantilever beam by a locking mechanism, and the locking mechanism is connected to the locking mechanism via a locking mechanism.

[0007] When the above arrangement needs to extend the walking distance of the vehicle on the fixed beam, the cantilever beam can be horizontally rotated relative to the plane where the fixed beam is located through the moving device. When the moving device drives the cantilever beam to rotate until it is flush with one side of the fixed beam, it is in an expanded state, so that the cantilever beam is expanded outward until the cantilever beam is rotated to be flush with the fixed beam. At this time, the fixed beam and the cantilever beam are in the same straight line, and the first ear plate on the outer side of the cantilever beam is rotated to the first mounting seat on the outer side of the fixed beam. It can then be inserted into the first mounting seat and the first ear plate through the locking device to fix the outer side of the fixed beam and the cantilever beam, thereby ensuring the reliability of the connection between the fixed beam and the cantilever beam, and the trolley walking on it is connected to the inner side of the fixed beam and the cantilever beam through the hinge. The outer sides of the fixed beam and the cantilever beam are supported by a locking device to ensure the reliability of the connection and improve the connection stability of the cantilever beam with the fixed beam after rotation, thereby meeting the driving operation requirements; and after the driving operation is completed, the locking device pulls out the first mounting seat and the first ear plate, and the cantilever beam can be driven by the moving device to rotate and fold toward the inside of the fixed beam, so that the cantilever beam is reset. After the cantilever beam is folded and reset, it is located between the fixed beams, completing the retraction of the cantilever beam, and at the same time, the pin shaft is driven by the second driving member to be inserted into the first mounting seat arranged on the outside of the connecting part and the first ear plate arranged on the outside of the cantilever beam, thereby achieving fixation between the fixed beam and the cantilever beam. The operation is simple, and fixation can be achieved by manual installation.

[0008] Furthermore, the moving device also includes a connecting plate and a moving plate. The other end of the driving member is an output shaft, which is rotatably connected to the connecting plate and the moving plate through a rotating shaft. The fourth mounting seat and the fifth mounting seat are fixed on the inner side of the cantilever beam, and the fourth mounting seat and the fifth mounting seat are rotatably connected to the connecting plate and the moving plate through a rotating shaft.

[0009] In the above arrangement, a driving member 1 is provided on one side of the fixed beam, and the output shaft of the driving member 1 is connected to the connecting plate and the movable plate. The output shaft of the driving member 1 can be extended and retracted within the driving member 1, and the other side of the connecting plate is connected to a side of the connecting part, and the other side of the movable plate is connected to a side of the cantilever beam. When the output shaft of the driving member 1 is retracted, the connecting plate and the movable plate are driven to move, so that the cantilever beam is retracted inward; when the output shaft of the driving member 1 is extended, the connecting plate and the movable plate are driven to move, so that the cantilever beam is expanded outward.

[0010] Furthermore, one or more second mounting seats are provided on the inner side of the connecting portion, and the second mounting seats are arranged at intervals along the height direction of the connecting portion. One or more second ear plates are provided on the inner side of the cantilever beam, and a rotating shaft is provided in the second mounting seat and the second ear plate, and the second mounting seat and the second ear plate are rotatably connected through the rotating shaft.

[0011] The above arrangement can provide two second mounting seats on the inner side of the connecting part to provide a connection position for the second ear plate on the cantilever beam. The second mounting seat and the second ear plate are connected by a rotating shaft to complete the rotatable connection between the fixed beam and the cantilever beam. When the driving cylinder drives the cantilever beam to rotate, the cantilever beam rotates with the second mounting seat and the second ear plate as the fulcrum, and the second mounting seat bears the weight of the cantilever beam. Therefore, the mobile device only needs to drive the cantilever beam to rotate in the horizontal direction, and bears less weight of the cantilever beam and the weight when the cantilever beam is used to lift the container. This can ensure the stability of the cantilever beam rotation, thereby reducing the operating load time of the mobile device and extending its service life.

[0012] Furthermore, the second mounting seat includes two second mounting plates protruding outward from the inner side surface of the connecting part, and an accommodating space is formed between the two second mounting plates. A second connecting ear is arranged in the accommodating space. The second mounting plate and the second connecting ear are provided with connecting holes, and a rotating shaft is arranged in the connecting hole.

[0013] The above arrangement forms an accommodating space between the second mounting plates, so that the second connecting ear can be accommodated in the accommodating space, thereby enabling the second connecting ear to be accommodated in the accommodating space when the cantilever beam is folded, thereby accommodating the cantilever beam more reliably.

[0014] Furthermore, a connecting block is fixedly provided at the output end of the driving member 2, and more than two connecting ears are provided at the upper end of the pin shaft. Through holes matching the locking member are provided on the connecting block and the connecting ears. The upper end surface of the pin shaft is recessed inwardly along the axial direction of the pin shaft to form a limiting groove, and the lower end portion of the connecting block is extended outwardly along the length direction of the connecting block to form a protrusion matching the limiting groove. Under the drive of the driving member 2, the pin shaft is fixed by being inserted into a first mounting seat arranged on the outside of the connecting part and a first ear plate arranged on the outside of the cantilever beam.

[0015] With the above arrangement, due to the arrangement of the limit groove, after the protrusion is aligned with the limit groove between the two connecting ears and embedded in the limit groove, the through hole on the connecting block is aligned with the through hole on the connecting ear, and the locking member can be passed through the through hole to connect the connecting block and the connecting ear to form a whole, which is convenient for the disassembly and assembly of the pin shaft. Since the protrusion is embedded in the limit groove, the limit groove can limit the rotation of the pin shaft around the connection between the connecting block and the connecting ear, so that the pin shaft can be driven to move in the vertical direction by the second driving member. After the cantilever beam of the gantry crane is flipped to be flush with the fixed beam, the second driving member can be used to control the pin shaft to be inserted into the first mounting seat set on the outside of the connecting part and the first ear plate set on the outside of the cantilever beam for fixation. When the cantilever beam needs to be flipped, the second driving member can be used to control the pin shaft to move out of the first mounting seat set on the outside of the connecting part and the first ear plate set on the outside of the cantilever beam.

[0016] Furthermore, a control valve component is provided at the upper end of the second driving component, and the control valve component is connected to the hydraulic oil pipe.

[0017] The above arrangement facilitates controlling the hydraulic pressure of the second driving member through the control valve member, thereby driving the pin shaft.

[0018] Furthermore, a flange plate is fixedly provided at the lower end of the driving member 2, and mounting holes are evenly distributed in a circumference on the flange plate. The driving member 2 is fixed to the driving member 2 mounting seat by passing bolts through the mounting holes.

[0019] The above arrangement facilitates the fixing of the second driving member above the supporting member, and facilitates the second driving member to drive the pin shaft to move up and down in the vertical direction.

[0020] Furthermore, the through hole on the connecting block passes through the connecting block, and the distance from the center of the through hole on the connecting block to the end face of the protrusion matches the distance from the center of the through hole on the connecting ear to the bottom face of the limiting groove.

[0021] With the above arrangement, after the protrusion is embedded in the limiting groove, the through hole on the connecting block can be aligned with the through hole on the connecting ear, thereby facilitating the locking member to pass through the through hole for fixed connection.

[0022] Furthermore, the limiting groove is arranged on the center line of the two connecting ears and is located between the two connecting ears.

[0023] The above arrangement facilitates the protrusion to align with the limiting groove and fit into the limiting groove, making disassembly and assembly convenient.

[0024] Furthermore, a chamfer is formed between the lower end surface of the pin shaft and the two side surfaces of the pin shaft, and connection holes matching the pin shaft are provided on the first mounting seat and the first ear plate.

[0025] The above arrangement plays a guiding role in inserting the pin into the connecting hole on the first mounting seat arranged on the outside of the connecting portion and the connecting hole on the first ear plate arranged on the outside of the cantilever beam.

[0026] Furthermore, the upper end of the pin shaft extends horizontally outward to form a limiting portion, and the diameter of the limiting portion is larger than the diameter of the connecting hole of the support member.

[0027] The above arrangement can limit the height to which the pin can descend after the pin is inserted into the connecting hole of the support member, thereby preventing the pin from excessively descending and passing through the connecting hole, resulting in poor fixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structural connection of the locking device in the present utility model.

[0029] Figure 2 This is a front view of the locking device in the present utility model.

[0030] Figure 3 It is a side view of the locking device in the present utility model.

[0031] Figure 4 It is a top view of the locking device in the present utility model.

[0032] Figure 5 This is a structural diagram of the second driving member in the present utility model.

[0033] Figure 6 It is the front view of the pin shaft in the utility model.

[0034] Figure 7 It is a side view of the pin in the utility model.

[0035] Figure 8 It is a top view of the pin in the utility model.

[0036] Figure 9 This is a schematic diagram of the structural connection of the present utility model.

[0037] Figure 10 for Figure 9 Enlarged view of point A in the middle.

[0038] Figure 11 This is a schematic diagram of the structural connection of the mobile device in the present utility model.

[0039] Figure 12 for Figure 11 Enlarged view of point B in the middle.

[0040] Figure 13 for Figure 11 Enlarged view of point C in the middle. DETAILED DESCRIPTION

[0041] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementation methods.

[0042] like Figure 1-13 As shown, a gantry crane folding arm linkage device is arranged on the gantry crane's door frame, including a moving device and a locking device, the two ends of the moving device are respectively connected to the fixed beam z1 of the door frame and the inner side of the cantilever beam 21, the locking device is connected to the outer side of the fixed beam z1 of the door frame, the fixed beam z1 is fixedly connected to the connecting portion 111 of the door frame, the connecting portion 111 and the cantilever beam 21 are hinged by a rotating shaft, the moving device includes a driving member 31, one end of the driving member 31 is rotatably connected to the fixed beam z1 through a third mounting seat 333, and the other end of the driving member 31 is respectively connected to the fixed beam z1 through a connecting plate 32 and a moving plate 33. It is rotatably connected to the fourth mounting seat 44 and the fifth mounting seat 55 set on the cantilever beam, and the locking device includes a driving member 2 1 and a pin shaft 7. The output end of the driving member 2 1 is connected to the pin shaft 7 through a locking member. The driving member 1 31 drives the cantilever beam 21 to rotate outward in the horizontal direction within the plane where the fixed beam z1 is located. After the cantilever beam 21 rotates to be flush with the fixed beam z1, the pin shaft 7 is driven by the driving member 2 1 to insert into the first mounting seat 1111 set on the outside of the connecting portion 111 and the first ear plate 22 set on the outside of the cantilever beam 21. In this embodiment, the driving member 1 31 is the oil cylinder 1, and the driving member 2 1 is the oil cylinder 2.

[0043] The mobile device also includes a connecting plate 32 and a mobile plate 33. The other end of the driving member 31 is an output shaft 311, and the output shaft 311 is rotatably connected to the connecting plate 32 and the mobile plate 33 through a rotating shaft. The fourth mounting seat 44 and the fifth mounting seat 55 are fixed to the inner side of the cantilever beam 21. The fourth mounting seat 44 and the fifth mounting seat 55 are rotatably connected to the connecting plate 32 and the mobile plate 33 through a rotating shaft. In this way, a driving member 31 is provided on one side of the fixed beam z1. The output shaft 311 of the driving member 31 is connected to the cantilever beam 21. The connecting plate 32 and the movable plate 33 are connected, and the output shaft 311 of the driving member 31 can be extended and retracted in the driving member 31. The other side of the connecting plate 32 is connected to a side surface of the connecting portion 111, and the other side of the movable plate 32 is connected to a side surface of the cantilever beam 21. When the output shaft of the driving member 31 is retracted, the connecting plate 32 and the movable plate 33 are driven to move, so that the cantilever beam 21 is retracted inward; when the output shaft of the driving member 31 is extended, the connecting plate 32 and the movable plate 33 are driven to move, so that the cantilever beam 21 is expanded outward.

[0044] The connecting portion 111 has one or more second mounting seats 1112 arranged on the inner side thereof, and the second mounting seats 1112 are arranged at intervals along the height direction of the connecting portion 111. The cantilever beam 21 has one or more second ear plates 23 arranged on the inner side thereof, and a rotating shaft is arranged in the second mounting seat 1112 and the second ear plate 23. The second mounting seat 1112 and the second ear plate 23 are rotatably connected to each other through the rotating shaft. The second mounting seat 1112 includes two second mounting plates 11121 protruding outward from the inner side surface of the connecting portion 111, and an accommodating space is formed between the two second mounting plates 11121. A second connecting ear is arranged in the accommodating space, and a connecting hole 1 is provided on the second mounting plate 11121 and the second connecting ear, and a rotating shaft is provided in the connecting hole 1. In this way, an accommodating space is formed between the second mounting plates 11121, so that the second connecting ear is accommodated in the accommodating space, so that the second connecting ear can be accommodated in the accommodating space when the cantilever beam 21 is folded, so that the cantilever beam 21 can be accommodated more reliably.

[0045] The upper end of the driving member 2 1 is provided with a control valve member 2, which is connected to a hydraulic oil pipe (not shown in the figure). The control valve member 2 is a hydraulically controlled one-way valve. The lower end of the driving member 2 1 is fixedly provided with a flange plate 3, and the flange plate 3 is provided with mounting holes 4 which are evenly distributed around the circumference. The driving member 2 1 is fixed to the driving member 2 mounting seat 5 by passing bolts through the mounting holes 4. In this embodiment, the driving member 2 mounting seat 5 located above the support member is fixedly set on the gantry crane 6. The driving member 2 mounting seat 5 is provided with mounting holes which are evenly distributed around the circumference and match the bolts, so that the driving member 2 1 is conveniently fixed above the support member, and the driving member 2 1 drives the pin shaft 7 to move up and down in the vertical direction.

[0046] The output end of the driving member 2 1 is fixed with a connecting block 8, and the upper end of the pin shaft 7 is provided with more than two connecting ears 9. In this embodiment, the connecting ears 9 are provided with two, and the two connecting ears 9 are arranged opposite to each other. A through hole 10 that matches the locking member is provided on the connecting block 8 and the connecting ear 9. The through hole 10 on the connecting block 8 runs through the connecting block 8. The distance from the center of the through hole 10 on the connecting block 8 to the end face of the protrusion 11 matches the distance from the center of the through hole 10 on the connecting ear 9 to the bottom surface of the limiting groove 12. In this way, after the protrusion 11 is embedded in the limiting groove 12, the through hole 10 on the connecting block 8 can be just aligned with the through hole 10 on the connecting ear 9. , so that the locking member can pass through the through hole 10 for fixed connection. In this embodiment, the locking member includes a fixed shaft 13 and a latch 14. A limit block 15 is fixedly provided at one end of the fixed shaft 13. The diameter of the limit block 15 is larger than the diameter of the through hole 10. The other end of the fixed shaft 13 is provided with an opening (not marked in the figure) that matches the latch 14. After the fixed shaft 13 passes through the through hole 10, a gasket 16 is sleeved between the connecting ear 9 and the connecting block 8. The connecting block 8 is clamped by the gasket 16 to prevent the connecting block 8 from shaking left and right. Then, the latch 14 passes through the opening on the fixed shaft 13, and then the connecting block 8 and the connecting ear 9 are connected to form a whole.

[0047] The upper end surface of the pin shaft 7 is recessed inwardly along the axial direction of the pin shaft 7 to form a limit groove 12. The limit groove 12 is arranged on the center line of the two connecting ears 9 and is located between the two connecting ears 9. In this embodiment, the limit groove 12 is arranged at the center position of the upper end surface of the pin shaft 7, so that the distance from the limit groove 12 to the connecting ears 9 on both sides is equal. The lower end portion of the connecting block 8 extends outward along the length direction of the connecting block 8 to form a protrusion 11 that matches the limit groove 12, so that the protrusion 11 is easy to align with the limit groove 12 and embed into the limit groove 12, making it easy to disassemble and assemble. Chamfered corners are formed between the two side surfaces of the protrusion 11 and the connecting block 8, thereby forming a smooth arc-shaped connection, thereby improving the rigidity of the connection between the protrusion 11 and the connecting block 8.

[0048] In this embodiment, a chamfer is formed between the lower end surface of the pin shaft 7 and the two side surfaces of the pin shaft 7. The first mounting seat 1111 is fixed to the connecting portion 111, and the first lug plate 22 is fixed to the cantilever beam 21. The first mounting seat 1111 and the first lug plate 22 are both provided with connecting holes that match the pin shaft 7, thereby guiding the pin shaft 7 to be inserted into the connecting holes of the first mounting seat 1111 and the first lug plate 22. The upper end of the pin shaft 7 extends outward horizontally to form a limiting portion 71. The diameter of the limiting portion 71 is larger than the diameter of the connecting hole provided on the first mounting seat 1111 and the first lug plate 22. In this way, after the pin shaft 7 is inserted into the connecting hole of the first mounting seat 1111 and the first lug plate 22, the height of the pin shaft 7 can be limited, thereby preventing the pin shaft 7 from excessively descending and passing through the connecting hole, resulting in poor fixing effect.

[0049] The working principle of the utility model is as follows: when it is necessary to extend the walking distance of the vehicle on the fixed beam z1, the cantilever beam 21 can be horizontally rotated relative to the plane where the fixed beam is located through the moving device. When the moving device drives the cantilever beam 21 to rotate until it is flush with one side of the fixed beam z1, it is in the expanded state, so that the cantilever beam 21 is expanded outward until the cantilever beam 21 is rotated to be flush with the fixed beam z1. At this time, the fixed beam z1 and the cantilever beam 21 are in the same straight line, and the first ear plate on the outside of the cantilever beam 21 is rotated into the first mounting seat on the outside of the fixed beam, and can be inserted into the first mounting seat through the locking device. And the first ear plate, the outer sides of the fixed beam z1 and the cantilever beam 21 are fixed, and the connection stability of the cantilever beam 21 with the fixed beam z1 after rotation is improved, thereby meeting the driving operation requirements; and after the driving operation is completed, the locking device pulls out the first mounting seat and the first ear plate, and the cantilever beam 21 can be driven by the moving device to rotate and fold toward the inside of the fixed beam z1, so that the cantilever beam 21 is reset. After folding and resetting, the cantilever beam 21 is located between the fixed beam z1, completing the retraction of the cantilever beam 21, and the fixed connection between the fixed beam and the cantilever beam can be achieved through the driving component 2, and the operation method is simple.

Claims

1. A gantry crane folding arm linkage device, arranged on the gantry crane's door frame, characterized by: The cam is connected to the outside of the fixed beam of the door frame and the inner side of the cantilever beam, and the locking device is connected to the outside of the fixed beam of the door frame. The fixed beam is fixedly connected to the connecting part of the door frame, and the connecting part and the cantilever beam are hinged by a rotating shaft. The movable device includes a driving member 1, one end of the driving member 1 is rotatably connected to the fixed beam, and the other end of the driving member 1 is rotatably connected to a member arranged on the cantilever beam. The locking device includes a driving member 2 and a pin shaft, and the output end of the driving member 2 is connected to the pin shaft through the locking member. The driving member 1 drives the cantilever beam to rotate outward in a horizontal direction within the plane where the fixed beam is located. After the cantilever beam rotates to be flush with the fixed beam, the pin shaft is driven by the driving member 2 to insert into the first mounting seat arranged on the outside of the connecting part and the first ear plate arranged on the outside of the cantilever beam.

2. The gantry crane folding arm linkage device according to claim 1, characterized in that: The moving device also includes a connecting plate and a moving plate. The other end of the driving member is an output shaft, which is rotatably connected to the connecting plate and the moving plate through a rotating shaft. The fourth mounting seat and the fifth mounting seat are fixed on the inner side of the cantilever beam, and the fourth mounting seat and the fifth mounting seat are rotatably connected to the connecting plate and the moving plate through a rotating shaft.

3. The gantry crane folding arm linkage device according to claim 1, characterized in that: One or more second mounting seats are arranged on the inner side of the connecting part, and the second mounting seats are arranged at intervals along the height direction of the connecting part. One or more second ear plates are arranged on the inner side of the cantilever beam, and a rotating shaft is arranged in the second mounting seat and the second ear plate. The second mounting seat and the second ear plate are rotatably connected through the rotating shaft.

4. The gantry crane folding arm linkage device according to claim 3, characterized in that: The second mounting seat includes two second mounting plates protruding outward from the inner side of the connecting part, and an accommodating space is formed between the two second mounting plates. A second connecting ear is arranged in the accommodating space. The second mounting plate and the second connecting ear are provided with connecting holes, and a rotating shaft is arranged in the connecting hole.

5. The gantry crane folding arm linkage device according to claim 1, characterized in that: The output end of the second driving member is fixed with a connecting block, and the upper end of the pin shaft is provided with more than two connecting ears, and the connecting block and the connecting ears are provided with through holes matching the locking member. The upper end surface of the pin shaft is recessed inwardly along the axial direction of the pin shaft to form a limiting groove, and the lower end portion of the connecting block is extended outwardly along the length direction of the connecting block to form a protrusion matching the limiting groove. Under the drive of the second driving member, the pin shaft is fixed by being inserted into the first mounting seat arranged on the outside of the connecting part and the first ear plate arranged on the outside of the cantilever beam.

6. The gantry crane folding arm linkage device according to claim 5, characterized in that: A control valve component is provided at the upper end of the second driving component, and the control valve component is connected to the hydraulic oil pipe.

7. The gantry crane folding arm linkage device according to claim 6, characterized in that: A flange plate is fixedly provided at the lower end of the driving member 2, and mounting holes are evenly distributed on the circumference of the flange plate. The driving member 2 is fixed to the driving member 2 mounting seat by passing bolts through the mounting holes.

8. The gantry crane folding arm linkage device according to claim 5, characterized in that: The through hole on the connecting block passes through the connecting block, and the distance from the center of the through hole on the connecting block to the end surface of the protrusion matches the distance from the center of the through hole on the connecting ear to the bottom surface of the limiting groove.

9. The gantry crane folding arm linkage device according to claim 8, characterized in that: The limiting groove is arranged on the center line of the two connecting ears and is located between the two connecting ears.

10. The gantry crane folding arm linkage device according to claim 1, characterized in that: A chamfer is formed between the lower end surface of the pin shaft and the two side surfaces of the pin shaft. Connecting holes matching the pin shaft are provided on the first mounting seat and the first ear plate. The upper end of the pin shaft extends horizontally outward to form a limiting portion, and the diameter of the limiting portion is larger than the diameter of the connecting hole of the support member.

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