Extension arm in-wall communication system and crane

Abstract

The invention discloses an outrigger in-wall communication system which comprises an in-arm controller, an optical fiber cable, a cable drum and a main controller, the in-arm controller, the optical fiber cable and the cable drum are arranged in a crane outrigger, the main controller is arranged on a crane rotary table, the optical fiber cable stretches out and draws back on the cable drum, one end of the optical fiber cable is connected with the in-arm controller through a first optical fiber converter, and the other end of the optical fiber cable is connected with a second optical fiber converter. The other end is connected with the main controller through the second optical fiber converter; the in-arm controller collects internal signals of the crane extending arm and transmits the internal signals to the main controller through the first optical fiber converter, the optical fiber cable and the second optical fiber converter in sequence. By means of the anti-electromagnetic interference characteristic of optical signals, electromagnetic interference generated by the antenna effect caused by the fact that the cable of the cable drum in the arm is pulled up too long can be effectively avoided, and stable transmission of signals in the arm is achieved.

Description

Technical Field

[0001] This invention relates to the field of crane communication, and in particular to a communication system inside the boom wall and a crane. Background Technology

[0002] With the technological development of mobile cranes, in order to meet the technical requirements of lifting higher and farther, cranes typically adopt a single-cylinder pin-type extension boom structure, increasing the boom length by adding more boom sections. However, single-cylinder pin-type extension booms require the installation of position sensors inside the boom to monitor the boom position, cylinder pin, and boom pin status. The sensor signals are then transmitted via CAN bus to the main controller on the turntable to realize the boom extension operation. When the crane operates in environments with strong magnetic field interference, the communication signal inside the boom is often lost due to electromagnetic interference after reaching a certain height, preventing the crane from continuing the boom extension action and forcing it to be taken out of service. Therefore, it is necessary to design EMS interference protection for the communication system inside the boom of single-cylinder pin-type products. Summary of the Invention

[0003] Purpose of the Invention: To overcome the shortcomings of the prior art, the first objective of this invention is to provide an intra-arm communication system. This system utilizes an intra-arm electrical system based on the principle of converting differential bus signals into optical signals, replacing the existing intra-arm CAN bus communication with fiber optic signal communication. By leveraging the characteristic that optical signals are unaffected by electromagnetic interference, stable signal transmission within the intra-arm communication system can be achieved. Alternatively, a wireless communication module can be used to convert bus signals into wireless signals to achieve wireless signal transmission within the intra-arm. Stable signal communication can be achieved by changing the communication frequency band to avoid current electromagnetic interference bands.

[0004] The second objective is to provide a crane that includes the aforementioned in-wall communication system for outriggers.

[0005] Technical solution: The present invention provides an in-wall communication system for a crane boom, comprising: an in-arm controller, an optical fiber cable, a cable reel, and a main controller located on the crane turntable. The optical fiber cable extends and retracts on the cable reel. One end of the optical fiber cable is connected to the in-arm controller via a first optical fiber converter, and the other end is connected to the main controller via a second optical fiber converter. The in-arm controller collects signals from inside the crane boom and transmits them sequentially through the first fiber optic converter, fiber optic cable, and second fiber optic converter to the main controller.

[0006] Furthermore, the in-arm controller sends a CAN bus differential signal, which is first converted into a TTL digital signal by the first fiber optic converter, and then encoded into a corresponding optical signal by the LED driver chip. The optical signal is transmitted to the second fiber optic converter via an optical fiber cable. After receiving the optical signal, the second fiber optic converter converts the optical signal back into an electrical signal through a photosensitive element, and restores it to the original CAN bus differential signal through a demodulation circuit, which is finally received by the main controller.

[0007] Another type of boom wall-mounted communication system includes: an in-boom controller located inside the crane boom and a main controller located on the crane turntable. Both the in-boom controller and the main controller are connected to a wireless communication module. By changing the communication frequency band to avoid the current electromagnetic interference frequency band, stable signal communication can be achieved. The boom controller collects signals from inside the crane boom, converts them into wireless signals via a wireless communication module, and transmits them to the main controller.

[0008] Furthermore, the wireless communication module is a WIFI module or a Bluetooth module. Correspondingly, the crane provided in this application includes an outrigger and a turntable, as well as the aforementioned communication system within the outrigger wall.

[0009] Beneficial effects: Compared with the prior art, the significant advantages of this invention are: by utilizing the electromagnetic interference resistance of optical signals, it can effectively avoid electromagnetic interference caused by the antenna effect when the cable reel inside the arm is stretched too long, thus achieving stable signal transmission within the arm; the transmission rate of multimode optical fiber signals can reach 1Mbps, which is faster than the 250kbps and 500kbps transmission rates commonly used in CAN buses; and it can also achieve wireless transmission of signals within the arm by using a wireless communication module to convert bus signals into Wi-Fi / Bluetooth signals, and can avoid the current electromagnetic interference frequency band by changing the communication frequency band, thus achieving stable signal communication. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the system of the present invention. Detailed Implementation

[0011] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Example 1: As Figure 1The shown boom wall communication system includes: an in-boom controller, an optical fiber cable, a cable reel, and a main controller located on the crane turntable. The optical fiber cable extends and retracts on the cable reel. One end of the optical fiber cable is connected to the in-boom controller via a first optical fiber converter, and the other end is connected to the main controller via a second optical fiber converter. The in-boom controller collects signals from inside the crane boom and transmits them to the main controller sequentially through the first optical fiber converter, the optical fiber cable, and the second optical fiber converter.

[0013] The controller inside the arm sends a CAN bus differential signal, which is first converted into a TTL digital signal by the first fiber optic converter, and then encoded into a corresponding optical signal by the LED driver chip. The optical signal is transmitted to the second fiber optic converter via fiber optic cable. After receiving the optical signal, the second fiber optic converter converts the optical signal back into an electrical signal through a photosensitive element, and then restores it to the original CAN bus differential signal through a demodulation circuit, which is finally received by the main controller.

[0014] Example 2: Another boom wall-mounted communication system includes: an in-boom controller located inside the crane boom and a main controller located on the crane turntable, wherein both the in-boom controller and the main controller are connected to a wireless communication module; The boom controller collects signals from inside the crane boom, converts them into WIFI or Bluetooth signals via a wireless communication module, and transmits them to the main controller. It changes the communication frequency band to avoid the current electromagnetic interference band, thus achieving stable signal communication.

Claims

1. A communication system within an outrigger wall, characterized in that, include: The crane boom includes an internal controller, fiber optic cable, cable reel, and a main controller located on the crane turntable. The fiber optic cable extends and retracts on the cable reel. One end of the fiber optic cable is connected to the internal controller via a first fiber optic converter, and the other end is connected to the main controller via a second fiber optic converter. The in-arm controller collects signals from inside the crane boom and transmits them sequentially through the first fiber optic converter, fiber optic cable, and second fiber optic converter to the main controller.

2. The in-wall communication system for outriggers according to claim 1, characterized in that: The controller inside the arm sends a CAN bus differential signal, which is first converted into a TTL digital signal by the first fiber optic converter, and then encoded into a corresponding optical signal by the LED driver chip. The optical signal is transmitted to the second fiber optic converter via an optical fiber cable. After receiving the optical signal, the second fiber optic converter converts the optical signal back into an electrical signal through a photosensitive element, and then restores it to the original CAN bus differential signal through a demodulation circuit, which is finally received by the main controller.

3. A communication system within an outrigger wall, characterized in that, include: The boom controller is located inside the crane boom and the main controller is located on the crane turntable. Both the boom controller and the main controller are connected to a wireless communication module. The boom controller collects signals from inside the crane boom, converts them into wireless signals via a wireless communication module, and transmits them to the main controller. It changes the communication frequency band to avoid the current electromagnetic interference band, thus achieving stable signal communication.

4. The in-wall communication system for outriggers according to claim 3, characterized in that: The wireless communication module is either a WIFI module or a Bluetooth module.

5. A crane, comprising an extension boom and a turntable, characterized in that, It also includes the in-wall communication system of the outrigger as described in any one of claims 1-4.

Images