Movable maintenance platform and shore crane

Abstract

The application provides a movable maintenance platform and a shore-based crane, and relates to the technical field of shore-based crane maintenance. The platform comprises: at least one track, which is arranged on the outer side of the main beam, the two ends of the track extending to the end of the main beam and being flush with the end of the main beam or being located on the outer side of the end of the main beam; a moving assembly, which is movably connected with the track; and a maintenance platform, which is connected with the moving assembly. The moving assembly is configured to move along the extension direction of the track to drive the maintenance platform to move along the length direction of the main beam. According to the application, the track is added to cover the entire length of the main beam, and the maintenance platform moves relative to the main beam through the moving assembly, so that the maintenance platform can be driven to any position of the main beam, such as the front end of the main beam, the middle region of the main beam, the last end of the main beam and the position directly below the driver's cabin. The application eliminates the maintenance blind area, expands the maintenance range and realizes full-coverage maintenance of the main beam.

Description

Technical Field

[0001] This application relates to the field of quay crane technology, and more particularly to a mobile maintenance platform and quay crane. Background Technology

[0002] A quay crane (or simply quay crane) is a specialized piece of equipment used at the forefront of a container terminal for loading and unloading ships. The maintenance platform is used for the routine maintenance and repair of the quay crane, especially for the comprehensive inspection and maintenance of the crane's main beam structure and its auxiliary equipment (such as towing systems, cable chain systems, and the bottom of the operator's cab).

[0003] In related technologies, the maintenance platform and the quay crane's spreader system are directly connected and fixed together by locking pins. The spreader system includes a spreader and a trolley assembly. The trolley assembly is connected to the spreader. The maintenance platform moves synchronously with the spreader and the trolley assembly, so that the movement range of the maintenance platform is the travel range of the trolley assembly, covering the middle area of ​​the main beam.

[0004] However, the above-mentioned methods have limited scope of maintenance and have blind spots (such as the front and rear ends of the main beam and the bottom of the driver's cab). Utility Model Content

[0005] This application provides a mobile maintenance platform that expands the scope of maintenance.

[0006] To achieve the above objectives, the technical solution of this application is as follows:

[0007] On one hand, this application provides a movable maintenance platform, comprising: at least one track disposed on the outside of a main beam, with both ends of the track extending to the ends of the main beam and being flush with or located on the outside of the ends of the main beam; a moving component movably connected to the track; and a maintenance platform connected to the moving component, the moving component being configured to move along the extension direction of the track to drive the maintenance platform to move along the length direction of the main beam.

[0008] In some possible implementations, the movable maintenance platform provided in this application embodiment further includes a drive component connected to the moving component, and the drive component is used to drive the moving component to move along the extension direction of the track.

[0009] In some possible implementations, the movable maintenance platform provided in this application embodiment includes a drive component comprising a rope, at least two drums, and at least two redirecting pulleys. The rope is wound around the drums, and one end of the rope is connected to the movable component via the redirecting pulleys.

[0010] In some possible implementations, the movable maintenance platform provided in this application embodiment includes a motor drive component, which is connected to the movable component.

[0011] In some possible implementations, the movable maintenance platform provided in this application embodiment uses a three-in-one reducer as its motor drive component.

[0012] In some possible implementations, the movable maintenance platform provided in this application embodiment further includes a lifting component connected to the maintenance platform. The maintenance platform includes a maintenance frame and a maintenance platform. The lifting component is disposed within the maintenance frame and connected to the maintenance platform. The lifting component is used to drive the maintenance platform to rise or fall to adjust the height of the maintenance platform.

[0013] In some possible implementations, the movable maintenance platform provided in this application embodiment includes at least one set of wheels, which is movably connected to a track.

[0014] In some possible implementations, the movable maintenance platform provided in this application embodiment includes a wheel set comprising an active wheel set and a driven wheel set, wherein the active wheel set is connected to a drive assembly, and at least one of the active wheel set and the driven wheel set is connected to a track.

[0015] In some possible implementations, the movable maintenance platform provided in this application embodiment has two wheel sets and two tracks, and the wheel sets are connected to the tracks accordingly.

[0016] This application also provides a quay crane, including a body and a movable maintenance platform of any of the above embodiments disposed on the main beam of the body.

[0017] This application provides a movable maintenance platform, comprising: at least one track disposed on the outer side of a main beam, with both ends extending to the ends of the main beam and flush with or located outside the ends of the main beam; a moving assembly movably connected to the track; and a maintenance platform connected to the moving assembly, the moving assembly being configured to move along the extension direction of the track to drive the maintenance platform to move along the length of the main beam. By adding a track that covers the entire length of the main beam, and by moving the maintenance platform relative to the main beam via the moving assembly, this application allows the maintenance platform to be driven to any position on the main beam, such as the front end, the middle area, the rear end, and directly below the driver's cab, eliminating maintenance blind spots, expanding the maintenance range, and achieving full coverage maintenance of the main beam. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] Figure 1 A schematic diagram of the connection between the movable maintenance platform and the main beam provided in the embodiments of this application;

[0020] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0021] Figure 3 A schematic diagram of the wheel assembly in the movable maintenance platform provided in this application embodiment;

[0022] Figure 4 A schematic diagram of the connection between the motor drive unit and the wheel assembly in the movable maintenance platform provided in this embodiment of the application;

[0023] Figure 5 for Figure 4 A structural diagram from another perspective;

[0024] Figure 6 A schematic diagram of the structure of a drive component in a movable maintenance platform provided in an embodiment of this application;

[0025] Figure 7 A schematic diagram of the movement range of the movable maintenance platform provided in the embodiments of this application within the main beam;

[0026] Figure 8 This is a schematic diagram illustrating the movement range of the maintenance platform on the main beam in related technologies.

[0027] Explanation of reference numerals in the attached figures:

[0028] 10-Main beam; 20-Operator's cab; 30-Lifting device; 100-Railway; 200-Moving component; 210-Wheel set; 211-Driving wheel set; 212-Driven wheel set; 300-Maintenance platform; 310-Maintenance frame; 320-Maintenance bench; 400-Drive component; 410-Rope; 420-Drum; 430-Redirecting pulley; 440-Motor drive component; 500-Lifting component.

[0029] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0030] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended application.

[0031] It should be noted that in the description of the embodiments of this application, the terms "upper", "lower", "inner", "outer" and other terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description, and are not intended to indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this application.

[0032] Furthermore, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] A quay crane (or simply quay crane) is a specialized piece of equipment used at the forefront of a container terminal for loading and unloading ships. The maintenance platform is used for the routine maintenance and repair of the quay crane, especially for the comprehensive inspection and maintenance of the crane's main beam structure and its auxiliary equipment (such as towing / carrier systems, the bottom of the operator's cab, etc.).

[0035] In related technologies, the maintenance platform is usually directly connected to the lifting system and fixed together by locking pins. It moves synchronously with the movement of the lifting equipment and trolley assembly. The movement range of the maintenance platform is the travel range of the trolley assembly, covering the middle area of ​​the main beam.

[0036] However, the above-mentioned methods have insufficient coverage and there are blind spots in maintenance (such as the front and rear ends of the main beam and the bottom of the driver's cab, which are key areas that cannot be inspected).

[0037] For example, in related technologies, the maintenance platform requires a lifting system to hoist it to the corresponding position. However, because the lifting system is wire rope traction, it experiences significant swaying. The maintenance platform's movement depends on the trolley traction system and cannot move independently, thus limiting its maintenance range. Since the maintenance platform and the lifting system are integrated, the platform's position can only move with the trolley assembly. The total travel of the trolley assembly is fixed, resulting in a fixed maintenance area for the platform. The maintenance platform can only reach a limited distance. Figure 8 The total travel range of the trolley, as shown in H0, prevents the maintenance platform from reaching the front and rear ends of the main beam and the bottom of the driver's cab under the trolley assembly.

[0038] In addition, the quay crane requires a dedicated driver's cab cleaning platform and a towing maintenance platform, making its structure complex.

[0039] In view of this, this application provides a movable maintenance platform, comprising: at least one track disposed on the outer side of the main beam, with both ends of the track extending to the ends of the main beam and being flush with or located on the outer side of the ends of the main beam; a moving assembly movably connected to the track; and a maintenance platform connected to the moving assembly, the moving assembly being configured to move along the extension direction of the track to drive the maintenance platform to move along the length direction of the main beam. By adding a track that covers the entire length of the main beam, and by moving the maintenance platform relative to the main beam via the moving assembly, this application allows the maintenance platform to be driven to any position on the main beam, such as the front end, the middle area, the rear end, and directly below the driver's cab, eliminating maintenance blind spots, expanding the maintenance range, and achieving full coverage maintenance of the main beam.

[0040] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0041] This application provides a mobile maintenance platform, combined with Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, it includes: at least one track 100, the track 100 being disposed on the outside of the main beam 10, with both ends of the track 100 extending to the ends of the main beam 10 and being flush with or located on the outside of the ends of the main beam 10; a moving assembly 200, the moving assembly 200 being movably connected to the track 100; and a maintenance platform 300, the maintenance platform 300 being connected to the moving assembly 200, the moving assembly 200 being configured to move along the extension direction of the track 100 to drive the maintenance platform 300 to move along the length direction of the main beam 10.

[0042] The track 100 is set along the length of the main beam 10.

[0043] For example, a track 100 is provided on one side of the main beam 10, and the maintenance platform 300 is mounted on the track 100 via a moving component 200 (such as a wheel set 210). In this embodiment, the moving component 200 allows the maintenance platform 300 to move relative to the main beam 10, from one end to the other, so that the maintenance platform 300 can cover the middle area, the front end area, and the rear end area of ​​the main beam 10, ensuring full coverage of its maintenance area. Figure 7 The range of H1 in the text.

[0044] Alternatively, a track 100 can be set on each of the opposite sides of the main beam 10, and the maintenance platform 300 can be mounted on the track 100 by means of a moving component 200 (such as two wheel sets 210 or four wheel sets 210).

[0045] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 In order to facilitate the driving of the moving component 200, this application also includes a driving component 400, which is connected to the moving component 200 and is used to drive the moving component 200 to move along the extension direction of the track 100.

[0046] By adding track 100, which covers the entire length of the main girder 10, the maintenance platform 300 can move relative to the main girder 10 via the moving component 200. This allows the maintenance platform 300 to be driven to any position on the main girder 10, such as the front end, the middle area, the rear end, and directly below the driver's cab 20. This eliminates maintenance blind spots, expands the maintenance range, and achieves full coverage maintenance of the main girder 10. For example, the maintenance platform 300 can move along the extension direction of the main girder 10 of the quay bridge, from the front end to the rear end, covering the maintenance of the entire lower area of ​​the main girder 10.

[0047] The driver component 400 includes two types of driver implementations, combined with... Figure 3 , Figure 4 , Figure 5 One type of drive is the rope 410 traction drive, such as... Figure 6 As shown, another driving method is the self-driven motor method.

[0048] This application embodiment takes the traction drive method of rope 410 as an example, combined with Figure 1 , Figure 3 , Figure 4 , Figure 5 The drive assembly 400 includes a rope 410, at least two drums 420 and at least two redirecting pulleys 430. The rope 410 is wound around the drums 420, and one end of the rope 410 is connected to the moving assembly 200 via the redirecting pulleys 430.

[0049] Two drums 420 are positioned opposite each other at opposite ends of the main beam 10. The drums 420 and the redirecting pulleys 430 are typically fixedly mounted on the main beam 10 or its auxiliary structures. A rope 410 is wound around the drum 420. The axis of the drum 420 can be aligned along the width direction of the main beam 10, so that the direction of winding and unwinding the rope 410 is along the width direction of the main beam 10. One drum 420 can correspond to two redirecting pulleys 430.

[0050] For example, the rope 410 is wound on the drum 420, and one end of the rope 410 changes direction through the redirecting pulley 430. The rope 410 extending from the drum 420 is arranged along the width direction of the main beam 10. After passing through the redirecting slider, the rope 410 is arranged along the length direction of the main beam 10. The moving component 200 (such as the wheel set 210) is connected to the rope 410. The moving component 200 is driven to move by the drum 420 winding and unwinding the rope 410, thereby driving the maintenance platform 300 to move.

[0051] This embodiment converts the rotary winding and unwinding motion of the drum 420 into linear movement of the maintenance platform 300 along the length of the main beam 10. Two drums 420 are respectively installed at both ends of the main beam 10 (e.g., the left and right ends). The axis of the drums 420 is set along the length of the main beam 10, so that the direction of winding and unwinding the rope 410 is along the width direction of the main beam 10. Four redirecting pulleys 430 are provided, with one drum 420 corresponding to two redirecting pulleys 430.

[0052] This application does not limit the driving method of the drum 420. For example, the drum 420 can be driven by electricity or manually (such as by hand crank).

[0053] Rope 410 starts from the left drum 420, first changes direction via the first deflector pulley 430 at the left end (e.g., from the width direction to the length direction), rope 410 continues to extend forward (towards the right end of the main beam 10) to reach the moving assembly 200 (wheel set 210) and is fixedly connected to the moving assembly 200.

[0054] After passing through the moving assembly 200, the rope 410 continues to extend to the right end of the main beam 10, reaching the first redirecting pulley 430 at the right end, changing the direction of the rope 410 again, and guiding it to the drum 420 at the right end.

[0055] After the rope 410 passes around the right drum 420, it travels from the other end of the right drum 420 through the second deflector pulley 430 at the right end. The rope 410 then moves to the left along the return path, passes through the moving assembly 200 again, and reaches the second deflector pulley at the left end. The second deflector pulley at the left end guides the returning rope 410 to the left drum 420, thus forming a complete closed loop. When the two drums 420 rotate synchronously and in the same direction (e.g., one winding up the rope while the other unwinds), they drive the rope 410 to move, thereby causing the moving assembly 200 to move.

[0056] This application embodiment takes another self-driven motor method of the drive component 400 as an example, combined with Figure 1 , Figure 2 , Figure 6 , Figure 7 The drive assembly 400 includes a motor drive unit 440, which is connected to the moving assembly 200. The motor drive unit 440 is directly and fixedly mounted on the wheel set 210 frame of the moving assembly 200 via a mounting bracket. The output shaft of the motor drive unit 440 is connected to the drive wheel axle in the wheel set 210 via a coupling, thereby directly transmitting power to the drive wheel. When the motor drive unit 440 is energized, it directly drives the drive wheel to roll on the track 100, thereby moving the entire moving assembly 200 and the connected maintenance platform 300 along the length of the main beam 10.

[0057] Among them, combined Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 The motor drive unit 440 is a three-in-one reducer. This three-in-one reducer integrates the functions of a drive motor, reducer, and brake into a compact housing. It is directly mounted on the wheel set 210 frame of the moving assembly 200 via a flange, and the output shaft directly drives the drive wheels via a key connection. The reducer reduces the speed and increases the torque to meet the driving force required for platform movement; the brake automatically engages in case of power failure or when a stop is needed to prevent accidental platform movement, ensuring high safety.

[0058] In other embodiments, combined with Figure 1 , Figure 2 , Figure 3 The embodiments of this application also include a lifting component 500, which is connected to the maintenance platform 300. The maintenance platform 300 includes a maintenance frame 310 and a maintenance table 320. The lifting component 500 is disposed in the maintenance frame 310 and connected to the maintenance table 320. The lifting component 500 is used to drive the maintenance table 320 to rise or fall, so as to adjust the height of the maintenance table 320.

[0059] For example, the lifting assembly 500 uses a scissor lift mechanism, with one end connected to the inspection frame 310 and the other end connected to the inspection platform 320. The lifting assembly 500 has a built-in hydraulic cylinder or electric push rod as a power source. When it is necessary to adjust the height of the inspection platform 320 to accommodate different inspection work surfaces, such as when inspecting the bottom of the cab or avoiding the lifting equipment 30, the lifting assembly 500 is activated to drive the scissor mechanism to extend or retract, thereby smoothly raising or lowering the inspection platform 320.

[0060] The power supply of this application can be set inside the maintenance frame 310, located on one side of the lifting assembly 500, and the power supply can be a battery to power the movable maintenance platform.

[0061] In some possible implementations, the moving assembly 200 includes at least one wheel set 210 movably connected to the track 100. Each wheel set 210 comprises two or more wheels, which may be grooved or horizontal, engaging with the track 100 to allow the moving assembly 200 to roll stably along the extension direction of the track 100 without derailment. Multiple wheel sets 210 can be connected together via a frame, which can also be used to support and connect the maintenance platform 300 and / or the lifting assembly 500.

[0062] In some embodiments, combined with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 The wheel assembly 210 includes a driving wheel assembly 211 and a driven wheel assembly 212. The driving wheel assembly 211 is connected to the drive assembly 400, and at least one of the driving wheel assembly 211 and the driven wheel assembly 212 is connected to the track 100. The moving assembly 200 includes a plurality of wheel assemblies 210, wherein each wheel assembly 210 includes at least one driving wheel assembly 211 and at least one driven wheel assembly 212. The driving wheel assembly 211 is connected to the drive assembly 400 (such as a motor drive 440) and receives power.

[0063] For example, the active wheel set 211 and the driven wheel set 212 are connected by a drive shaft. The active wheel set 211 and the driven wheel set 212 are respectively arranged on two tracks 100. The motor drive unit 440 drives the active wheel set 211 to rotate, which drives the drive shaft to rotate, thereby driving the driven wheel set 212, so that one motor drive unit 440 drives the active wheel set 211 and the driven wheel set 212 to move synchronously on the two tracks 100 respectively.

[0064] In some other embodiments, there are two wheel sets 210 and two tracks 100, and the wheel sets 210 are connected to the tracks 100 respectively.

[0065] At least two parallel tracks 100 are arranged on opposite sides of the main beam 10 along its length. A wheel set 210 is provided, adapted to roll with the tracks 100 to achieve movement.

[0066] Correspondingly, the number of wheel sets 210 of the moving component 200 is also two. These two wheel sets 210 are connected to the two tracks 100 respectively, and the two wheel sets 210 are arranged at intervals along the extension direction of the tracks 100, such that one wheel set 210 runs on the left track 100 and the other wheel set 210 runs on the right track 100.

[0067] Alternatively, two wheel sets 210 can be spaced apart on the track 100 along the width of the main beam 10, with one wheel set 210 running on the front track 100 and the other wheel set 210 running on the rear track 100. The two wheel sets 210 are connected by a frame to form a whole. This double-sided symmetrical support structure makes the entire maintenance platform 300 more stable during movement and operation, with stronger anti-overturning ability, and is particularly suitable for large or heavy-duty maintenance scenarios.

[0068] This application also provides a quay crane, combined with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 The system includes a main body and a movable maintenance platform of any of the above embodiments disposed on the main body.

[0069] The main body of the quay crane includes a main girder 10. A maintenance platform 300 is mounted on the upper part or side of the main girder 10 via its track 100. The maintenance platform 300 covers at least the middle area, the front end area, the middle section, the rear end area, and the bottom area of ​​the operator's cab 20 of the main girder 10.

[0070] The central area of ​​the main beam 10 is the primary structural load-bearing zone, requiring routine inspections of welds, structural corrosion, and the tightness of high-strength bolts. The front end of the main beam 10 is where the pitch hinge point is located, necessitating frequent inspections and maintenance of the hinge pins, lubrication system, and safety hook mechanism. The rear end of the main beam 10 houses large drive mechanisms (such as the pitch wire rope drum 420 and pulley blocks), requiring periodic maintenance. The driver's cab 20, typically suspended below the rear end of the main beam 10, is located at the bottom. The maintenance platform 300 can be moved to directly below or to the side of the driver's cab 20, and its height can be adjusted via the lifting assembly 500, providing an operating position for maintenance of the equipment within the driver's cab 20.

[0071] It should be noted that when maintenance is required on any target area of ​​the main beam 10, the drive assembly 400 is activated, which moves the moving assembly 200 along the track 100 until the maintenance platform 300 is moved below or to the side of the target location. If the equipment in that area (such as the equipment on top of the driver's cab 20) requires close-range operation, the lifting assembly 500 can be activated to lower or raise the maintenance platform 300 to a suitable working height. Maintenance personnel can then perform operations on the stable maintenance platform 300, such as inspecting the bottom tow bar or cable chain of the main beam 10, inspecting the bottom of the driver's cab 20, and cleaning the bottom glass, without the need to erect dangerous high-altitude scaffolding or use aerial work platforms.

[0072] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0073] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. A mobile maintenance platform, characterized in that, include: At least one track is disposed on the outside of the main beam, and both ends of the track extend to the ends of the main beam and are flush with or located outside the ends of the main beam. A movable component, which is movably connected to the track; A maintenance platform is connected to the moving component, which is configured to move along the extension direction of the track to drive the maintenance platform to move along the length direction of the main beam.

2. The mobile maintenance platform according to claim 1, characterized in that, It also includes a drive component connected to the moving component, the drive component being used to drive the moving component to move along the extension direction of the track.

3. The mobile maintenance platform according to claim 2, characterized in that, The drive assembly includes a rope, at least two drums, and at least two redirecting pulleys. The rope is wound around the drums, and one end of the rope is connected to the moving assembly via the redirecting pulleys.

4. The mobile maintenance platform according to claim 2, characterized in that, The drive component includes a motor drive unit, which is connected to the moving component.

5. The mobile maintenance platform according to claim 4, characterized in that, The motor drive component is a three-in-one reducer.

6. The movable maintenance platform according to any one of claims 1-5, characterized in that, It also includes a lifting assembly connected to the maintenance platform. The maintenance platform includes a maintenance frame and a maintenance platform. The lifting assembly is disposed within the maintenance frame and connected to the maintenance platform. The lifting assembly is used to drive the maintenance platform to rise or fall to adjust the height of the maintenance platform.

7. The movable maintenance platform according to any one of claims 2-5, characterized in that, The moving component includes at least one set of wheels, which is movably connected to the track.

8. The mobile maintenance platform according to claim 7, characterized in that, The wheel set includes a driving wheel set and a driven wheel set, the driving wheel set is connected to the drive assembly, and at least one of the driving wheel set and the driven wheel set is connected to the track.

9. The mobile maintenance platform according to claim 7, characterized in that, The number of wheel sets and the number of tracks are both two, and the wheel sets are connected to the tracks accordingly.

10. A quay crane, characterized in that, The invention includes a main body and a movable maintenance platform as described in any one of claims 1-9, which is mounted on the main beam of the main body.

Images