Wireless communication system of rubber-tyred gantry crane

Abstract

The utility model discloses a wireless communication system of a rubber-tyred gantry crane, which comprises a gantry crane and a remote control center, the gantry crane is positioned in a storage yard, an airborne system and a microwave antenna are arranged on the gantry crane, and the microwave antenna is connected with the airborne system through a first cable; an installation frame and a base station are arranged on the periphery of the storage yard, at least one set of communication unit is arranged on the top of the installation frame, the communication unit comprises a track, a sliding contact line and a trolley, the trolley is movably arranged on the track, the trolley is electrically connected with the sliding contact line through a current collector, a wireless microwave module is arranged on the trolley, and the wireless microwave module is electrically connected with the base station. The wireless microwave module is connected with the base station through a second cable, the wireless microwave module is in wireless communication connection with the microwave antenna to form a microwave link, and the base station is connected with the remote control center through a third cable; the system has the advantages that the communication is more stable, and the real-time control precision can be guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of crane control technology, and in particular relates to a wireless communication system for a tire-mounted gantry crane. Background Technology

[0002] A tire-mounted gantry crane is a type of gantry crane that moves using tires. It is mainly used for loading, unloading, and stacking goods in container yards, logistics parks, and other similar locations. Unlike traditional rail-mounted gantry cranes, it does not require a fixed track and moves freely using its tires, making it more flexible.

[0003] Significant progress has been made in the automation control of rubber-tired gantry cranes, enabling unmanned or semi-automated operation. However, some challenges remain in communication systems. Due to factors such as obstruction by metal containers and electromagnetic interference from multiple devices, conventional wireless communications (such as Wi-Fi and 4G / 5G) are prone to signal attenuation or delay. If signal attenuation or delay occurs during communication between the remote control center and the rubber-tired gantry crane, it will affect the real-time control accuracy, thus leaving room for improvement. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a wireless communication system for a tire-mounted gantry crane, which provides more stable communication and helps to ensure the accuracy of real-time control.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a wireless communication system for a tire-mounted gantry crane, including a gantry crane and a remote control center. The gantry crane is located in a yard, and an onboard system and a microwave antenna are installed on the gantry crane. The microwave antenna is connected to the onboard system through a first cable. An installation frame and a base station are installed around the yard. At least one set of communication units is installed on the top of the installation frame. The communication unit includes a track, a sliding contact line, and a trolley. The trolley is movably installed on the track and is electrically connected to the sliding contact line through a current collector. A wireless microwave module is installed on the trolley. The wireless microwave module is connected to the base station through a second cable. The wireless microwave module and the microwave antenna are wirelessly connected to form a microwave link. The base station is connected to the remote control center through a third cable.

[0006] Preferably, the microwave antenna is a directional parabolic antenna, and the surface of the directional parabolic antenna is provided with a waterproof and salt spray resistant coating.

[0007] Preferably, the airborne system is also connected to a 5G communication module, through which a backup link is established with the remote control center.

[0008] Preferably, the trolley is provided with a rotating seat, a mounting seat, and a drive motor. A rotating shaft is rotatably mounted on the rotating seat. The back of the mounting seat is fixedly connected to the side of the rotating shaft via a connecting strip. The wireless microwave module is mounted on the mounting seat. The drive motor is located on the side of the rotating seat and connected to one end of the rotating shaft. The drive motor is used to drive the rotating shaft to rotate.

[0009] Preferably, the drive motor is a stepper motor, and the shaft is equipped with a photoelectric encoder.

[0010] Preferably, the communication unit is provided in multiple groups, which are distributed along the vertical direction. The vertical distance between two adjacent groups of communication units is not less than 2 meters, and the operating frequency bands of the multiple wireless microwave modules are different.

[0011] Preferably, the operating frequency band interval of the different wireless microwave modules is not less than 5 GHz.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] 1. The onboard system of the gantry crane is connected to a microwave antenna. The microwave antenna and the wireless microwave module on the periphery of the yard form a microwave link to form point-to-point communication. Compared with conventional wireless communication methods, the latency is lower and the communication is more stable. At the same time, it has a large bandwidth to meet the real-time control requirements and help ensure the accuracy of real-time control.

[0014] 2. By placing the wireless microwave module on the trolley, the position of the wireless microwave module can be dynamically adjusted. When the gantry crane moves, the trolley moves along the track to ensure that the wireless microwave module is always aligned with the microwave antenna on the gantry crane and maintains the best signal connection.

[0015] 3. By adding a 5G communication module, a backup link is established. When the microwave link signal strength is low, the communication mode can be switched to the backup link to maintain communication stability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a communication connection block diagram of the present invention;

[0018] Figure 3 This is a schematic diagram of the mounting bracket structure in this utility model. Figure 1 ;

[0019] Figure 4 This is a partial structural diagram of the communication unit in this utility model;

[0020] Figure 5 This is a schematic diagram of the mounting bracket structure in this utility model. Figure 2 .

[0021] In the diagram: 1. Gantry crane; 11. Onboard system; 12. Microwave antenna; 13. First cable; 2. Remote control center; 3. Mounting frame; 4. Base station; 5. Communication unit; 51. Track; 52. Sliding contact line; 53. Trolley; 531. Current collector; 54. Wireless microwave module; 55. Second cable; 6. Third cable; 7. 5G communication module; 81. Rotating seat; 811. Rotating shaft; 82. Mounting seat; 83. Drive motor; 9. Yard. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] Example 1: As Figures 1 to 3 As shown, a wireless communication system for a tire-mounted gantry crane is applicable to a container yard 9. It includes a gantry crane 1 and a remote control center 2. The gantry crane 1 is located in the yard 9. The gantry crane 1 is equipped with an onboard system 11 and a microwave antenna 12. The microwave antenna 12 is connected to the onboard system 11 through a first cable 13.

[0025] The periphery of the storage yard 9 is equipped with mounting frames 3 and base stations 4. At least one set of communication units 5 is mounted on the top of the mounting frames 3. Each communication unit 5 includes a track 51, a sliding contact line 52, and a trolley 53. The track 51 extends laterally, and the sliding contact line 52 is parallel to the track 51. The trolley 53 is movably mounted on the track 51 via rollers. The trolley 53 is electrically connected to the sliding contact line 52 via a current collector 531. A wireless microwave module 54 is mounted on the trolley 53 and connected to the base station 4 via a second cable 55. The wireless microwave module 54 and microwave antenna 12 are wirelessly connected to form a microwave link. The base station 4 is connected to a remote control center 2 via a third cable 6. The sliding contact line 52 is connected to a power source to provide power to the trolley 53. A drive motor is mounted on the trolley 53 to drive the rollers to rotate; this is a conventional technique in the field.

[0026] In this embodiment, the microwave antenna 12 is a directional parabolic antenna, which has good anti-interference capability and reduces the bit error rate to 10%. -6 The surface of the directional parabolic antenna is coated with a waterproof and salt spray resistant coating, such as polyurethane, which helps to extend its service life in humid environments. The horizontal beam angle of the directional parabolic antenna is preferably less than 10°, and the vertical beam angle is preferably less than 15°.

[0027] It should be noted that by placing the wireless microwave module 54 on the trolley 53, which is located on the mounting frame 3, the height of the wireless microwave module 54 is not lower than the main beam of the gantry crane 1. The wireless microwave module 54 will not be blocked by containers or other facilities in the yard 9, greatly reducing the possible interference factors. The preferred operating frequency band of the wireless microwave module 54 is 60GHz, 24GHz or 7Hz, which is selected according to the actual environment.

[0028] Example 2: Figure 1 and Figure 2 As shown, the rest of the parts are the same as in Embodiment 1. The difference is that the airborne system 11 is also connected to a 5G communication module 7. A backup link is established with the remote control center 2 through the 5G communication module 7. By adding the 5G communication module 7, when the microwave link signal strength is low, the communication mode can be switched to the backup link to maintain the stability of communication.

[0029] Of course, when the gantry crane 1 leaves the yard 9 and is on the transfer road, the gantry crane 1 is not in operation. The communication mode is switched to the backup link to maintain the stability of the communication. After the gantry crane 1 enters the yard 9, the microwave antenna 12 connected to its onboard system 11 is paired with the wireless microwave module 54 on the periphery of the yard 9. At this time, the communication mode is switched to the microwave link.

[0030] Example 3: Figures 2 to 4As shown, the rest is the same as in Embodiment 1, except that the trolley 53 is provided with a rotating seat 81, a mounting seat 82 and a drive motor 83. A rotating shaft 811 is rotatably mounted on the rotating seat 81 and extends laterally. The mounting seat 82 is fixedly connected to the rotating shaft 811 and can rotate with the rotating shaft 811. The wireless microwave module 54 is mounted on the mounting seat 82. The drive motor 83 is located on the side of the rotating seat 81 and connected to one end of the rotating shaft 811. The drive motor 83 is used to drive the rotating shaft 811 to rotate. The rotating base 81, mounting base 82, and drive motor 83 form a rotating unit to enable the wireless microwave module 54 to rotate up and down, which helps to improve flexibility. If the microwave antenna 12 and the wireless microwave module 54 are not on the same horizontal plane, the connection between the microwave antenna 12 and the wireless microwave module 54 will change during the movement of the gantry crane 1, that is, the angle between the connection and the horizontal plane will change. By adjusting the orientation of the wireless microwave module 54 through the rotating unit, it can be accurately aligned with the microwave antenna 12, which helps to ensure the stability of communication and paves the way for setting up multiple communication units 5.

[0031] In this embodiment, the drive motor 83 is a stepper motor with a control accuracy of less than or equal to 0.1°. The rotating shaft 811 is equipped with a photoelectric encoder, which can realize high-precision pointing control with a pointing error of less than 0.5°.

[0032] Example 4: Figure 5 As shown, the rest is the same as in Embodiment 1. The difference is that the communication unit 5 is provided in multiple groups, and the multiple groups of communication units 5 are distributed in the vertical direction. The vertical distance between two adjacent groups of communication units 5 is not less than 2 meters. The operating frequency bands of the multiple wireless microwave modules 54 are different. The multi-frequency band is deployed in layers to reduce the risk of interference.

[0033] In this embodiment, the operating frequency band interval of different wireless microwave modules 54 is not less than 5 GHz, specifically to avoid harmonic interference. Of course, dynamic frequency selection (DFS) function can also be added.

[0034] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the implementation of the present invention is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A wireless communication system for a tire-mounted gantry crane, comprising a gantry crane (1) and a remote control center (2), wherein the gantry crane (1) is located within a storage yard (9), characterized in that: The gantry crane (1) is equipped with an airborne system (11) and a microwave antenna (12), and the microwave antenna (12) is connected to the airborne system (11) through a first cable (13); The yard (9) is surrounded by an installation frame (3) and a base station (4). At least one set of communication units (5) is provided on the top of the installation frame (3). The communication unit (5) includes a track (51), a sliding contact line (52) and a trolley (53). The trolley (53) is movably mounted on the track (51). The trolley (53) is electrically connected to the sliding contact line (52) through a current collector (531). The trolley (53) is equipped with a wireless microwave module (54). The wireless microwave module (54) is connected to the base station (4) through a second cable (55). The wireless microwave module (54) and the microwave antenna (12) are wirelessly connected to form a microwave link. The base station (4) is connected to the remote control center (2) through a third cable (6).

2. A wireless communication system for a rubber tired gantry crane as defined in claim 1, characterized in that The microwave antenna (12) is a directional parabolic antenna, and the surface of the directional parabolic antenna is provided with a waterproof and salt spray resistant coating.

3. A wireless communication system for a rubber tired gantry crane as defined in claim 1, wherein: The airborne system (11) is also connected to a 5G communication module (7), and a backup link is established with the remote control center (2) through the 5G communication module (7).

4. A wireless communication system for a rubber tired gantry as defined in claim 1, wherein: The trolley (53) is provided with a rotating seat (81), a mounting seat (82) and a drive motor (83). A rotating shaft (811) is rotatably mounted on the rotating seat (81). The mounting seat (82) is fixedly connected to the rotating shaft (811). The wireless microwave module (54) is mounted on the mounting seat (82). The drive motor (83) is located on the side of the rotating seat (81) and connected to one end of the rotating shaft (811). The drive motor (83) is used to drive the rotating shaft (811) to rotate.

5. A wireless communication system for a rubber tired gantry crane as defined in claim 4, characterized in that: The drive motor (83) is a stepper motor, and the rotating shaft (811) is equipped with a photoelectric encoder.

6. A wireless communication system for a rubber tired gantry crane as defined in claim 4, wherein: The communication unit (5) is provided in multiple groups, and the multiple groups of communication units (5) are distributed in the vertical direction. The vertical distance between two adjacent groups of communication units (5) is not less than 2 meters. The operating frequency bands of the multiple wireless microwave modules (54) are all different.

7. The wireless communication system for a tire-mounted gantry crane according to claim 6, characterized in that: The operating frequency bands of the different wireless microwave modules (54) are not less than 5 GHz apart.

Images