Safety control system for towing excavator

Abstract

The utility model discloses a safety control system for a towed excavator, which belongs to the field of power supply of towed excavators and comprises a ground end and a vehicle-mounted end. The ground end and the vehicle-mounted end are both arranged on a three-phase power cable, the ground end comprises a main carrier, the vehicle-mounted end comprises a slave carrier, and circuit information of the ground end and circuit information of the vehicle-mounted end are in carrier communication on the three-phase power cable through the main carrier and the slave carrier. The ground end and the vehicle-mounted end are arranged, carrier communication is carried out through a three-phase power cable, information can be timely and effectively transmitted, and the operation safety of the power dragging excavator is improved.

Description

Technical Field

[0001] This utility model belongs to the field of power supply for electric tractor-trailers, specifically, it relates to a safety control system for electric tractor-trailers. Background Technology

[0002] With the rapid development of the construction industry, the application of large-scale construction machinery such as electric towed excavators is becoming increasingly widespread. Electric towed excavators are favored by construction companies due to their powerful digging capabilities and low operating costs. However, in actual use, the complex and variable working environment, coupled with the fact that electric towed excavators often need to travel long distances, places high demands on their power supply systems. Existing power supply safety monitoring systems are somewhat insufficient for the newly emerging electric towed excavators. For example, invention patent CN102012473B discloses a leakage current detection device for construction machinery. This device utilizes a structure where the motor is driven by an inverter powered by battery power, based on the operation of a control lever. A leakage current detection signal output unit applies a voltage signal between the DC bus connected to the battery and the main body of the machine. The signal detection unit detects this signal, and the presence or absence of a leakage current is determined based on the peak value of the detected voltage signal. Furthermore, to prevent false detections, the detection process is paused when the control lever is operated during the determination process.

[0003] However, existing battery-powered DC leakage current detection devices are not suitable for electric towed excavators. Electric towed excavators typically use three-phase AC power, and their power lines are long and susceptible to external environmental influences, such as cable wear and loose connections. These problems, if not monitored promptly, can lead to power instability or leakage accidents. Without effective safety control measures, this could not only damage the equipment but also cause safety accidents, resulting in personal injury and property damage.

[0004] In view of the above, this application is hereby submitted. Utility Model Content

[0005] The technical problem this invention aims to solve is to overcome the shortcomings of existing technologies and provide a safety control system for electric excavators. This invention is achieved through the following technical solution:

[0006] A safety control system for an electric excavator includes a ground-based end and a vehicle-mounted end;

[0007] Both the ground end and the vehicle end are installed on the three-phase power cable. The ground end includes a master carrier and the vehicle end includes a slave carrier. The circuit information of the ground end and the vehicle end is transmitted via carrier communication on the three-phase power cable through the master carrier and the slave carrier.

[0008] Preferably, the master carrier and slave carrier are arranged adjacent to each other on the three-phase power cable.

[0009] Preferably, the vehicle-mounted terminal is provided with a carrier, a power filter, and a second contactor KM2 sequentially along the three-phase power cable toward the vehicle side.

[0010] Preferably, the ground terminal further includes a three-phase meter, which collects the current of the three-phase power cable through the first mutual inductance coil CT1, the second mutual inductance coil CT2 and the third mutual inductance coil CT3;

[0011] The three-phase meter is also equipped with three data acquisition wires, which are respectively connected to the three live wires of the three-phase power cable. The three-phase meter acquires the voltage of the three-phase power cable through the data acquisition wires.

[0012] Preferably, the ground end further includes a residual current device installed on the three-phase power cable, through which the leakage current of the three-phase power cable is collected.

[0013] Preferably, a reactor is provided between the residual current protector and the main carrier.

[0014] Preferably, the ground end also includes a disconnecting switch QF1 and a first contactor KM1 installed on the three-phase power cable.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. By setting up ground-side and vehicle-mounted terminals and using three-phase power cables for carrier communication, information can be transmitted in a timely and effective manner, improving the safety of the electric excavator operation.

[0017] 2. By placing the master carrier and slave carrier adjacent to each other on the three-phase power cable, interference and attenuation during signal transmission can be reduced, communication quality can be improved, thereby ensuring the response speed and accuracy of the control system, and further improving the system's working efficiency and safety.

[0018] 3. By setting up three-phase meters and their functions of collecting current and voltage through mutual inductance coils and acquisition wires, the system can monitor the working status of three-phase power cables in real time, providing accurate data support for fault diagnosis, helping to promptly detect and handle problems in the power system, and ensuring the normal operation of equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the ground terminal wiring of this utility model;

[0020] Figure 2 This is a schematic diagram of the vehicle-mounted wiring of this utility model;

[0021] Figure 3 This is a schematic diagram of the ground control system of this utility model;

[0022] Figure 4 This is a schematic diagram of the vehicle-mounted control system of this utility model.

[0023] In the diagram: 1. Three-phase meter; 2. Residual circuit protector; 3. Reactor; 4. Master carrier; 5. Slave carrier; 6. Power filter; 7. Ground emergency stop switch; 8. Stop button; 9. Run button; 10. Buzzer; 11. Leakage indicator light; 12. Vehicle emergency stop switch; 13. Microcontroller. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] like Figure 1 – Figure 4 As shown, this embodiment provides a safety control system for an electric scooter, including a ground end and a vehicle-mounted end;

[0026] Both the ground end and the vehicle end are installed on the three-phase power cable. The ground end includes a master carrier 4, and the vehicle end includes a slave carrier 5. The circuit information of the ground end and the vehicle end is communicated via carrier communication on the three-phase power cable through the master carrier 4 and the slave carrier 5.

[0027] By setting up ground-based and vehicle-mounted terminals and using three-phase power cables for carrier communication, information can be transmitted in a timely and effective manner, improving the safety of the electric excavator operation.

[0028] The master carrier 4 and slave carrier 5 are arranged adjacent to each other on the three-phase power cable. By arranging the master carrier 4 and slave carrier 5 adjacent to each other on the three-phase power cable, interference and attenuation during signal transmission can be reduced, communication quality can be improved, thereby ensuring the response speed and accuracy of the control system, and further improving the system's working efficiency and safety.

[0029] The vehicle-mounted terminal is provided with a carrier 5, a power filter 6, and a second contactor KM2 sequentially arranged along the three-phase power cable toward the vehicle side.

[0030] Preferably, the ground terminal further includes a three-phase meter 1, which collects the current of the three-phase power cable through a first mutual inductance coil CT1, a second mutual inductance coil CT2 and a third mutual inductance coil CT3;

[0031] The three-phase meter 1 is also equipped with three data acquisition wires, which are respectively connected to the three live wires of the three-phase power cable. The three-phase meter 1 acquires the voltage of the three-phase power cable through the data acquisition wires.

[0032] By setting up three-phase meter 1 and its function of collecting current and voltage through mutual inductance coils and acquisition wires, the system can monitor the working status of three-phase power cables in real time, providing accurate data support for fault diagnosis, helping to discover and deal with power system problems in a timely manner, and ensuring the normal operation of equipment.

[0033] The ground terminal also includes a residual current device (RCD) installed on the three-phase power cable, which collects the leakage current of the three-phase power cable. The RCD added at the ground terminal can effectively detect leakage current in the three-phase power cable, quickly cut off the power supply, prevent electric shock accidents, and greatly improve electrical safety.

[0034] Preferably, a reactor 3 is provided between the residual current protector and the main carrier 4. The reactor 3 can suppress electromagnetic interference, protect the quality of communication signals, enable the main carrier 4 to work more stably, and improve the reliability and safety of the entire system.

[0035] The ground end also includes a disconnecting switch QF1 and a first contactor KM1 installed on the three-phase power cable.

[0036] Specifically, such as Figure 1 As shown, the ground end includes a disconnecting switch QF1, a three-phase meter 1, a first contactor KM1, a residual circuit protector 2, a reactor 3, and a main carrier 4, which are sequentially installed on the three-phase power cable.

[0037] like Figure 2 As shown, the vehicle-mounted terminal includes a slave carrier 5, a power filter 6, and a second contactor KM2, which are sequentially arranged on the three-phase power cable.

[0038] Furthermore, such as Figure 3 and Figure 4 As shown, the safety control system also includes a ground-based system control section, such as... Figure 3 As shown, before the first contactor KM1, there are also an emergency stop switch, a stop button 8, a normally open contact of relay KA1, and a run button 9.

[0039] The control coils of the main carrier 4, residual current protector, three-phase meter 1 and relay KA1 are all connected to the microcontroller 13, which collects data and controls the on / off state.

[0040] Furthermore, a buzzer 10 and a leakage indicator light 11 are connected to the residual current protector, and a control panel KEYPAD is also connected to the vehicle controller VECU.

[0041] When power is needed to power the excavator, the operator must first manually close the isolating switch and press the run button 9. If there is no system fault or alarm, the first contactor KM1 will close to provide power. At this time, the three-phase meter 1 can collect the current of the three live wires through the three mutual inductance coils, collect the voltage of the three live wires through the acquisition wires, and transmit the data to the microcontroller 13 via serial communication.

[0042] The residual current device collects the leakage current of the three-phase power cable and transmits it to the microcontroller 13. The microcontroller 13 then transmits the voltage, current, and leakage current data to the main carrier 4 via serial communication. The slave carrier 5 obtains the information sent by the main carrier 4 from the three-phase power cable and transmits it to the vehicle control unit (VECU) via serial communication. The VECU processes the data and transmits the vehicle's real-time power consumption and leakage current level to the vehicle display unit (IECU) for display.

[0043] Emergency stop procedure:

[0044] When an emergency power switch is required, if the operator is in the vehicle, he can press the vehicle emergency stop switch 12 to send an emergency stop signal to the vehicle controller VECU. The signal is then transmitted to the ground system's microcontroller 13 via carrier communication (uploaded from the slave carrier 5 to the three-phase power cable and received by the master carrier 4). The ground system's microcontroller 13 controls the relay KA1 coil to de-energize, thereby de-energizing the first contactor KM1 coil and stopping the power supply to the entire system.

[0045] If the operator is near the ground cabinet, they can press the ground emergency stop switch 7 of the ground system to achieve the emergency stop function.

[0046] Self-protection logic:

[0047] 1. During power supply operation, if the residual current device detects that the leakage current exceeds the set value 1 (generally 80% of the set value 2), it will transmit the information to the vehicle display IECU via carrier communication (uploaded by the main carrier 4 to the three-phase power cable and received by the slave carrier 5). The vehicle display IECU will issue an audible and visual alarm to remind the driver to check the wiring and components.

[0048] 2. During power supply operation, if the residual current device detects that the leakage current exceeds the set value 2 (the safety threshold set according to experience), it will immediately disconnect the power supply of the isolating switch QF1, the isolating switch QF1 will trip, and the buzzer 10 and the leakage indicator light 11 will sound an alarm, thus achieving power cut-off.

[0049] 3. During power supply operation, if the voltage or current of the power supply system received by the vehicle controller VECU exceeds the set range, or other preset safety faults occur (such as the absence or sudden change of voltage or current in a certain phase), a shutdown message will be automatically sent to the microcontroller 13 to control the power outage protection.

Claims

1. A safety control system for an electric scooter, characterized in that: Including ground-based and vehicle-mounted terminals; Both the ground end and the vehicle end are installed on the three-phase power cable. The ground end includes a master carrier (4), and the vehicle end includes a slave carrier (5). The circuit information of the ground end and the vehicle end is transmitted via carrier communication on the three-phase power cable through the master carrier (4) and the slave carrier (5).

2. A safety control system for an electric excavator according to claim 1, characterized in that: The master carrier (4) and slave carrier (5) are arranged adjacent to each other on the three-phase power cable.

3. A safety control system for an electric excavator according to claim 1, characterized in that: The vehicle-mounted terminal is provided with a carrier (5), a power filter (6), and a second contactor KM2 sequentially along the three-phase power cable toward the vehicle side.

4. A safety control system for an electric excavator according to claim 1, characterized in that: The ground end also includes a three-phase meter (1), which collects the current of the three-phase power cable through the first mutual inductance coil CT1, the second mutual inductance coil CT2 and the third mutual inductance coil CT3; The three-phase meter (1) is also equipped with three data acquisition wires, which are respectively connected to the three live wires of the three-phase power cable. The three-phase meter (1) acquires the voltage of the three-phase power cable through the data acquisition wires.

5. A safety control system for an electric excavator according to claim 1, characterized in that: The ground end also includes a residual current device installed on the three-phase power cable, through which the leakage current of the three-phase power cable is collected.

6. A safety control system for an electric scooter according to claim 5, characterized in that: A reactor (3) is provided between the residual current protector and the main carrier (4).

7. A safety control system for an electric excavator according to claim 1, characterized in that: The ground end also includes a disconnecting switch QF1 and a first contactor KM1 installed on the three-phase power cable.

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