Multi-signal anti-interference communication transmission system in crane boom, crane and communication transmission method

Abstract

The invention discloses a multi-signal anti-interference communication transmission system in a crane boom, a crane and a communication transmission method, and relates to the technical field of crane signal transmission. The multi-signal anti-interference communication transmission system comprises a cylinder pin detection switch, a boom pin detection switch and a boom position detection switch; the cylinder pin detection switch, the arm pin detection switch and the arm position detection switch penetrate through the multifunctional cable drum through cables to be connected with a main controller of the crane, a length measuring sensor is arranged on the multifunctional cable drum, and the main controller is in electric signal connection with the length measuring sensor. And a cable penetrates through the multifunctional cable drum to be connected with the cylinder arm pin switching electromagnetic valve. According to the invention, the quality of cylinder arm pin signal detection and transmission in the telescopic process of the telescopic cylinder of the cargo boom is improved, and the product reliability is improved.

Description

Technical Field

[0001] This invention relates to a multi-signal anti-interference communication transmission system for a crane boom, as well as a crane and a communication transmission method, belonging to the field of crane signal transmission technology. Background Technology

[0002] Currently, mobile crane boom telescopic systems mainly adopt rope-type and single-bar pin-type. With the development of lifting machinery technology, pin-type telescopic boom systems are gradually becoming more widely used on large-tonnage cranes. This system reduces the stress deformation of the boom during lifting and improves the lifting performance of the crane.

[0003] The crane boom needs to extend. First, the cylinder pin cylinder extends the cylinder pin. After a detection switch confirms the extension status of the telescopic cylinder and the boom, the boom pin is pulled out. After a detection switch confirms the disconnection status of the crane boom, the telescopic cylinder extends the boom to the required position. Within the crane boom, the actions of inserting the boom pin, pulling out the cylinder pin, detecting the boom position signal, confirming the extension length of the telescopic cylinder, and processing the signal of the cylinder-boom pin state switching control valve must all be completed within the boom itself.

[0004] Currently, cranes mostly use in-boom controllers to collect signals from inside the boom, process these signals directly, and convert them into standard CAN bus lines for transmission with the main controller. Current research on interference immunity for in-boom cylinder pin and boom position status detection is also based on this system, such as wrapping the controller in aluminum foil to reduce electromagnetic interference, adding signal amplifiers to the controller's receiving port, and adding anti-electromagnetic interference magnetic rings. These methods are effective in reducing electromagnetic interference in the boom signals, but their effectiveness is less than satisfactory, especially under strong electromagnetic interference, particularly in long-boom, long-operation scenarios. With the increasing demand for lightweight crane design, single-bar pin-type in-boom control systems are being used more and more in small-section crane booms, placing higher demands on fault diagnosis and troubleshooting of in-boom controllers. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multi-signal anti-interference communication transmission system for crane booms, as well as a crane and a communication transmission method, which improves the quality of cylinder boom pin signal detection and transmission during the extension and retraction of the crane boom telescopic cylinder, thereby improving product reliability.

[0006] To achieve the above objectives, the present invention is implemented using the following technical solution: In a first aspect, the present invention provides a multi-signal anti-interference communication transmission system for a crane boom, including a cylinder pin detection switch, a boom pin detection switch, and a boom position detection switch. The cylinder pin detection switch, boom pin detection switch, and boom position detection switch are all connected to the crane main controller via cables through a multi-functional cable reel. The multi-functional cable reel is equipped with a length measuring sensor. The main controller is electrically connected to the length measuring sensor and is also connected to the cylinder-boom pin switching solenoid valve via cables through the multi-functional cable reel.

[0007] Furthermore, the multi-functional cable reel includes a fixed mounting flange on which a multi-functional cable reel harness is wound, and is equipped with a length measuring sensor and a length measuring wire rope inside. The length measuring sensor is used to detect the length of the extended length measuring wire rope and convert it into a current signal that is transmitted to the crane main controller. The length of the length measuring wire rope corresponds to the distance between the telescopic shaft end of the telescopic cylinder and the tail of the current boom segment.

[0008] Furthermore, it also includes a camera, which is connected to the crane main controller via a cable through a multi-functional cable reel. The camera is used to capture images inside the crane boom and transmit them to the crane main controller.

[0009] Furthermore, it also includes a power interface, which is connected to the camera via a cable through a multi-functional cable reel.

[0010] In a second aspect, the present invention also provides a crane that includes a multi-signal anti-interference communication transmission system within the crane boom as described in the first aspect.

[0011] Furthermore, in the multi-signal anti-interference communication transmission system within the crane boom, the cylinder pin detection switch, boom pin detection switch, and boom position detection switch are all located on the telescopic cylinder body, the multi-functional cable reel is located on the inner side of the end of the crane boom, and the crane main controller is located inside the turntable control box.

[0012] Furthermore, the power interface is located inside the turntable control box, and the camera is located inside the crane boom.

[0013] Thirdly, the present invention also provides a multi-signal anti-interference communication transmission method within a crane boom, the method being implemented by a multi-signal anti-interference communication transmission system within a crane boom as described in any one of the first aspects, comprising: The cylinder pin status signal is detected by the cylinder pin detection switch, the arm pin status signal is detected by the arm pin detection switch, and the arm position detection switch is detected by the arm segment signal of the telescopic cylinder. The cylinder pin status signal, boom pin status signal, and boom segment signal of the telescopic cylinder are transmitted to the crane main controller via cable through a multi-functional cable reel. The length measuring sensor is used to detect the length of the steel wire rope and convert it into a current signal, which is then transmitted to the crane controller. The crane's main controller determines the distance between the telescopic cylinder's telescopic shaft end and the current boom tail by judging the current signal. Combined with the cylinder pin status signal, boom pin status signal, and the boom segment signal where the telescopic cylinder is located, the cylinder-boom pin switching solenoid valve is controlled to realize the telescopic cylinder's extension and retraction.

[0014] Furthermore, the cylinder pin state includes a cylinder pin locked state and a cylinder pin unlocked state, and the arm pin state includes an arm pin locked state and an arm pin unlocked state.

[0015] Furthermore, the crane's main controller determines the telescopic cylinder's extension length by judging the current signal, and controls the cylinder-arm pin switching solenoid valve by combining the cylinder pin status signal, the boom pin status signal, and the boom segment signal where the telescopic cylinder is located, to realize the extension and retraction of the telescopic cylinder, including: The distance between the telescopic cylinder's telescopic shaft end and the current boom tail section is calculated based on the current signal, and its expression is as follows: S=k × I in, S This indicates the distance from the telescopic shaft end of the telescopic cylinder to the tail of the current boom segment. k Indicates the scaling factor. I Indicates the current signal value; When the distance between the telescopic cylinder's telescopic shaft end and the current boom tail does not reach the preset position, the cylinder-arm pin switching solenoid valve first controls the arm pin to be in the unlocked state, and then drives the telescopic cylinder to extend after the cylinder pin is in the locked state. Then, the cylinder pin is controlled to be in the unlocked state and the arm pin is in the locked state. When the telescopic cylinder's telescopic shaft end reaches a preset position from the current boom tail, after the working condition ends, the cylinder-arm pin switching solenoid valve first controls the arm pin to be in the unlocked state and the cylinder pin to be in the locked state, then drives the telescopic cylinder to retract. Then, the cylinder pin is controlled to be in the unlocked state and the arm pin to be in the locked state.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The crane boom in-arm communication transmission system provided by this invention transmits only the switching signals and current signals of the monitoring switch and cylinder boom pin switching control valve within the crane boom during the entire telescopic movement. Compared with the prior art where the in-arm controller directly processes the signals and transmits the standard CAN signal to the main controller, this effectively avoids the impact of electromagnetic interference on the control CAN signal under long-arm operation, reduces erroneous frames in CAN bus transmission, improves the quality of cylinder boom pin signal detection and transmission during the telescopic movement of the crane boom, and enhances product reliability. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the structure of a multi-signal anti-interference communication transmission system inside a crane boom in one embodiment of the present invention; Figure 2 This is a schematic diagram of one side structure of a multifunctional cable reel in one embodiment of the present invention; Figure 3 This is a schematic diagram of the other side structure of a multifunctional cable reel in one embodiment of the present invention; In the diagram: 1-Fixed mounting flange, 2-Multifunctional cable reel harness, 3-Length measuring steel wire rope, 4-Length measuring sensor. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention. Example 1

[0019] like Figure 1 As shown, this embodiment of the invention provides a multi-signal anti-interference communication transmission system for a crane boom, including a cylinder pin detection switch, a boom pin detection switch, and a boom position detection switch. The cylinder pin detection switch is used to detect the cylinder pin status, and the boom pin detection switch is used to detect the boom pin status. Both the cylinder pin status and the boom pin status include two states: locked and unlocked. The boom position detection switch detects the current telescopic boom section.

[0020] The cylinder pin detection switch, boom pin detection switch, and boom position detection switch are all connected to the crane main controller via cables through a multi-functional cable reel, thereby transmitting the cylinder pin status signal, boom pin status signal, and current telescopic boom segment signal to the crane main controller through the multi-functional cable reel harness.

[0021] like Figure 2 , Figure 3 As shown, in this embodiment, the multi-functional cable reel includes a fixed mounting flange 1, which is used to install the multi-functional cable reel on the inner side of the end of the crane boom. A multi-functional cable reel harness 2 is wound around the flange, and a length measuring sensor 4 and a length measuring wire rope 3 are also provided inside. The length measuring sensor 4 is used to detect the length of the length measuring wire rope 3 and convert it into a current signal, which is then transmitted to the crane main controller. The length of the length measuring wire rope 3 corresponds to the distance between the telescopic shaft end of the telescopic cylinder and the end of the current boom segment. That is, the distance between the telescopic shaft end of the telescopic cylinder and the end of the current boom segment can be determined by measuring the length of the length measuring wire rope 3.

[0022] In some embodiments, a camera and a power interface are also included. The camera can be connected to the crane main controller via a cable through a multi-function cable reel, thereby transmitting the captured images inside the crane boom to the crane main controller. The power interface is connected to the camera via a cable through the multi-function cable reel for convenient power supply to the camera. Example 2

[0023] Based on Embodiment 1, this embodiment also provides a crane, which includes the multi-signal anti-interference communication transmission system in the crane boom described in Embodiment 1.

[0024] Specifically, the locations of each component are as follows: the cylinder pin detection switch, boom pin detection switch, and boom position detection switch are all located on the telescopic cylinder body; the multi-functional cable reel is located on the inner side of the end of the boom; the crane main controller is located in the turntable control box; the power interface is located in the turntable control box; and the camera is located inside the boom. Example 3

[0025] Based on Example 1, this example provides a multi-signal anti-interference communication transmission method within a crane boom, comprising the following steps: The cylinder pin status signal is detected by the cylinder pin detection switch, the boom pin status signal is detected by the boom pin detection switch, and the current telescopic boom segment signal is detected by the boom position detection switch.

[0026] The cylinder pin status signal, boom pin status signal, and current telescopic boom segment signal are transmitted to the crane main controller via a cable through a multi-functional cable reel.

[0027] The length measuring sensor is used to detect the length measuring wire rope 3 and convert it into a current signal, which is then transmitted to the crane controller.

[0028] The crane's main controller determines the distance between the telescopic cylinder's telescopic shaft end and the current boom tail by analyzing the current signal. Combining this with the cylinder pin status signal, boom pin status signal, and the current telescopic boom segment signal, the controller controls the cylinder-boom pin switching solenoid valve to achieve the telescopic cylinder's extension and retraction. Specifically: Since the current signal is proportional to the distance between the telescopic cylinder's telescopic shaft end and the current boom tail, the distance between the telescopic cylinder's telescopic shaft end and the current boom tail can be calculated from the current signal, and its expression is as follows: S=k × I in, S This indicates the distance from the telescopic shaft end of the telescopic cylinder to the tail of the current boom segment. k Indicates the scaling factor. I This indicates the current signal value.

[0029] When the distance between the telescopic cylinder's telescopic shaft end and the current boom tail does not reach the preset position, the cylinder-arm pin switching solenoid valve first controls the arm pin to be in the unlocked state, and then the cylinder pin to be in the locked state before driving the telescopic cylinder to extend. Then, the cylinder pin is controlled to be in the unlocked state and the arm pin to be in the locked state.

[0030] When the telescopic cylinder's telescopic shaft end reaches a preset position from the current boom tail, after the working condition ends, the cylinder-arm pin switching solenoid valve first controls the arm pin to be in the unlocked state and the cylinder pin to be in the locked state, then drives the telescopic cylinder to retract. Then, the cylinder pin is controlled to be in the unlocked state and the arm pin to be in the locked state.

[0031] It should be noted that the preset positions are obtained based on actual working conditions, meaning that each arm segment has a corresponding length.

[0032] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A multi-signal anti-interference communication transmission system within a crane boom, characterized in that, The system includes a cylinder pin detection switch, a boom pin detection switch, and a boom position detection switch. All three switches are connected to the crane's main controller via cables through a multi-functional cable reel. The multi-functional cable reel is equipped with a length measuring sensor. The crane's main controller is signal-connected to the length measuring sensor and is also connected to the cylinder-boom pin switching solenoid valve via cables through the multi-functional cable reel.

2. The multi-signal anti-interference communication transmission system within the crane boom according to claim 1, characterized in that, The multi-functional cable reel includes a fixed mounting flange on which a multi-functional cable reel harness is wound. Inside, there is a length measuring sensor and a length measuring wire rope. The length measuring sensor is used to detect the length of the extended length measuring wire rope and convert it into a current signal that is transmitted to the crane's main controller. The length of the length measuring wire rope corresponds to the distance between the telescopic cylinder's telescopic shaft end and the tail of the current boom segment.

3. The multi-signal anti-interference communication transmission system within the crane boom according to claim 1, characterized in that, It also includes a camera, which is connected to the crane main controller via a cable through a multi-functional cable reel. The camera is used to capture images inside the crane boom and transmit them to the crane main controller.

4. The multi-signal anti-interference communication transmission system within the crane boom according to claim 1, characterized in that, It also includes a power interface, which is connected to the camera via a cable through a multi-functional cable reel.

5. A crane, characterized in that, It includes the multi-signal anti-interference communication transmission system within the crane boom as described in any one of claims 1 to 4.

6. The crane according to claim 5, characterized in that, In the multi-signal anti-interference communication transmission system inside the crane boom, the cylinder pin detection switch, boom pin detection switch, and boom position detection switch are all located on the telescopic cylinder body, the multi-functional cable reel is located on the inner side of the end of the crane boom, and the crane main controller is located inside the turntable control box.

7. The crane according to claim 5, characterized in that, The power interface is located inside the turntable control box, and the camera is located inside the crane boom.

8. A multi-signal anti-interference communication transmission method within a crane boom, characterized in that, The method is implemented using the multi-signal anti-interference communication transmission system within the crane boom as described in any one of claims 1 to 4, which includes: The cylinder pin status signal is detected by the cylinder pin detection switch, the boom pin status signal is detected by the boom pin detection switch, and the current telescopic boom segment signal is detected by the boom position detection switch. The cylinder pin status signal, boom pin status signal, and current telescopic boom segment signal are transmitted to the crane main controller via a multi-functional cable reel. The length measuring sensor is used to detect the length of the steel wire rope and convert it into a current signal, which is then transmitted to the crane controller. The crane's main controller determines the distance between the telescopic cylinder's telescopic shaft end and the current boom tail by judging the current signal. Combined with the cylinder pin status signal, boom pin status signal, and the current telescopic boom segment signal, the cylinder-boom pin switching solenoid valve is controlled to realize the telescopic cylinder's extension and retraction.

9. The multi-signal anti-interference communication transmission method within a crane boom according to claim 8, characterized in that, The cylinder pin state includes a cylinder pin locked state and a cylinder pin unlocked state, and the arm pin state includes an arm pin locked state and an arm pin unlocked state.

10. The multi-signal anti-interference communication transmission method within a crane boom according to claim 8, characterized in that, The process involves determining the telescopic cylinder's extension length by analyzing the current signal through the crane's main controller, and then controlling the cylinder-arm pin switching solenoid valve based on the cylinder pin status signal, boom pin status signal, and the current telescopic boom segment signal to achieve the extension and retraction of the telescopic cylinder. This includes: The distance between the telescopic cylinder's telescopic shaft end and the current boom tail section is calculated based on the current signal, and its expression is as follows: S=k × I in, S This indicates the distance from the telescopic shaft end of the telescopic cylinder to the tail of the current boom segment. k Indicates the scaling factor. I Indicates the current signal value; When the distance between the telescopic cylinder's telescopic shaft end and the current boom tail does not reach the preset position, the cylinder-arm pin switching solenoid valve first controls the arm pin to be in the unlocked state, and then drives the telescopic cylinder to extend after the cylinder pin is in the locked state. Then, the cylinder pin is controlled to be in the unlocked state and the arm pin is in the locked state. When the telescopic cylinder's telescopic shaft end reaches a preset position from the current boom tail, after the working condition ends, the cylinder-arm pin switching solenoid valve first controls the arm pin to be in the unlocked state and the cylinder pin to be in the locked state, then drives the telescopic cylinder to retract. Then, the cylinder pin is controlled to be in the unlocked state and the arm pin to be in the locked state.

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