A tire crane control system with battery transfer

Abstract

The present invention belongs to the technical field of tire cranes, and discloses a tire crane control system with battery transfer, including an electrical room and a battery room, wherein the electrical room contains a mains power supply line, a mains power supply line, an RTG auxiliary power supply, an AC / DC rectifier, and an inverter and a brake unit of each operating mechanism of the RTG connected to the AC / DC rectifier via a DC bus, and the installation position of the battery room is the position where the diesel generator set is removed from the original tire crane control system, and the battery room includes a battery compartment and an electrical compartment. The present invention successfully applies batteries and energy storage to RTGs, solves the dependence of RTGs on diesel generators during the transfer process, replaces diesel generator sets with batteries, and makes the tire crane independent of external power supplies, realizing independent power supply. In the absence of an external power supply, the tire crane can continue to work, and is suitable for environments where power cannot be connected or occasions that require frequent relocation, thereby improving the flexibility and mobility of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of tire cranes, and more particularly to a tire crane control system with battery switching. Background Art

[0002] The rubber-tyred crane (RTG for short) is the main equipment for lifting and transporting containers in port terminals, railway freight yards, container storage yards, etc., and its usage is quite large. It consists of a gantry support, a power transmission system, a lifting mechanism, a trolley running mechanism, a small car running mechanism and a telescopic spreader.

[0003] Traditional RTGs carry their own diesel generator sets to supply power to the electric and hydraulic systems of the entire machine, resulting in high fuel consumption and pollution. Although in recent years, the port has implemented the "oil-to-electricity" conversion for RTGs (oil-to-electricity conversion means to transform the cargo yard and use city electricity to power the RTG. There are two ways: one is to set up busbars on both sides of the RTG travel route in the cargo yard, and install a power supply device on the RTG, which is called busbar power supply; the other is to dig cable trenches on both sides of the RTG travel route in the cargo yard, and install cable reels on the RTG, which is called reel power supply), no matter which "oil-to-electricity" method is used, the flexibility of the equipment in the yard working area is limited, so a small-power diesel generator set is still needed to maintain the flexibility of the equipment. With the breakthrough improvement of battery and energy storage technology, the present invention successfully applies batteries and energy storage to RTGs, solves the dependence of RTGs on diesel generators during the transfer process, and replaces diesel generator sets with batteries. How to achieve electrical control of RTG battery transfer is the content of the present invention. Summary of the invention

[0004] The purpose of the present invention is to solve the embarrassing situation that the RTG powered by AC power still needs to switch to a small diesel generator set for power supply during the transfer process, resulting in insufficient energy saving and emission reduction. The proposed tire crane control system with battery transfer completely abandons the onboard diesel generator set, completely solves the carbon emissions of RTG, and achieves green environmental protection.

[0005] To achieve the above object, the present invention adopts the following technical solution.

[0006] A tire crane control system with battery transfer includes an electrical room and a battery room. The electrical room contains a mains power supply line, a mains power supply line, an RTG auxiliary power supply, an AC / DC rectifier, and inverters and brake units of various RTG operating mechanisms connected to the AC / DC rectifier via a DC bus.

[0007] The installation location of the battery room is the location where the diesel generator set was removed from the original tire crane control system. The battery room includes a battery compartment and an electrical compartment. A lithium battery pack and a battery management control box are installed in the battery compartment. The battery management control box is integrated with a BMS battery management system. The BMS battery management system is used to monitor the amount of electricity stored in the lithium battery pack, the battery voltage, current, temperature and fault protection.

[0008] The electrical compartment is equipped with a DC / DC charging and discharging device, a CVCF constant voltage and frequency device, a unidirectional diode, a fuse, a circuit switch, a PLC and a monitoring system. The circuit switch includes ①③⑤⑥⑦⑧ circuit breakers and ②④ contactors. The circuit switch is controlled to open and close through the PLC and the monitoring system.

[0009] The lithium battery pack is connected to the DC busbar in sequence through ③ circuit breaker, ② contactor, DC / DC charging and discharging device, and ① circuit breaker.

[0010] The RTG auxiliary power supply is connected to the mains through the ⑦ circuit breaker, the CVCF constant voltage and constant frequency device is connected to the mains through the ⑤ circuit breaker, the AC output end of the CVCF constant voltage and constant frequency device is connected to the RTG auxiliary power supply through the ⑥ circuit breaker, and the DC output end of the CVCF constant voltage and constant frequency device is connected to the DC bus through the ④ contactor, the unidirectional diode, and the fuse ① circuit breaker in sequence.

[0011] The PLC and monitoring system are respectively connected to the DC / DC charging and discharging device and the BMS battery management system, and are used for monitoring the DC / DC charging and discharging device, displaying the battery pack charging and discharging current, displaying fault records of the DC bus voltage and battery voltage, and interlocking with the RTG main control system, fault processing, and reading BMS data.

[0012] As a further description of the above technical solution: when the RTG works in the mains power supply area and obtains AC power from the mains, the ⑤ circuit breakers and ⑥ circuit breakers are closed, and the mains power is divided into two parts. One part is converted into DC voltage through the AC / DC rectifier, and power is supplied to the inverters of various operating mechanisms of the RTG through the DC busbar. The inverter drives the corresponding motor to operate according to the on-board PLC instructions.

[0013] The other part supplies power to the RTG auxiliary power supply through ⑤ circuit breaker, CVCF constant voltage and frequency device, and ⑥ circuit breaker. The RTG auxiliary power supply supplies RTG lighting, control, steering pump, solenoid valve, and auxiliary motor.

[0014] As a further description of the above technical solution: when the RTG is working in the mains power supply area, the BMS battery management system detects that the lithium battery pack is low on power and sends the detection information to the PLC and monitoring system. The PLC and monitoring system close the contactor ②, the circuit breaker ①, and the circuit breaker ③ in the battery room. The mains power is transmitted to the lithium battery pack through the AC / DC rectifier, the circuit breaker ①, the DC / DC charging and discharging device, and the contactor ②. The BMS battery management system controls the automatic charging of the lithium battery pack.

[0015] As a further description of the above technical solution: when the RTG is disconnected from the mains power grid, the ①③⑥ circuit breakers are closed and the ②④ contactors are closed, and the lithium battery pack releases electrical energy to provide it to the RTG in two ways, one way of which is through the lithium battery pack, ③ circuit breaker, ② contactor, DC / DC charging and discharging device, ① circuit breaker, DC bus and inverter to supply power to various operating mechanisms of the RTG.

[0016] The other path provides auxiliary power to the RTG via a lithium battery pack, ③ a circuit breaker, ② a contactor, a DC / DC charging and discharging device, a fuse, a unidirectional diode, ④ a contactor, a CVCF constant voltage and frequency device, and ⑥ a circuit breaker.

[0017] As a further description of the above technical solution: the electrical compartment also includes an LC filter, the LC filter is connected between the CCVCF constant voltage and constant frequency device and the RTG auxiliary power supply, and the LC filter is used for filtering the AC power output by the CCVCF constant voltage and constant frequency device.

[0018] As a further description of the above technical solution: the lithium battery pack is a lithium iron phosphate battery pack, and an emergency charger is also provided in the electrical compartment. The emergency charger is charged by an AC charging power supply, and the circuit breaker is arranged at the input end of the emergency charger.

[0019] As a further description of the above technical solution: the inverter includes a lifting inverter, a large vehicle sea side inverter, a large vehicle land side inverter and a small vehicle inverter.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] 1. Flexibility: Battery transfer can make the tire crane independent of external power supply and realize independent power supply. In the absence of external power supply, the tire crane can continue to work. It is suitable for environments where power cannot be connected or occasions that require frequent relocation, thereby improving the flexibility and mobility of the equipment.

[0022] 2. Energy saving and environmental protection: Installing a battery room at the installation location of the diesel generator set of the tire crane control system as a battery transfer can reduce dependence on traditional power resources, thereby reducing energy consumption. In addition, it can completely solve RTG carbon emissions, reduce environmental pollution, achieve green environmental protection, and meet the requirements of sustainable development.

[0023] 3. Emergency backup: Battery transfer can be used as an emergency backup power supply to provide power support in power outages or emergencies. When the external power supply fails, the tire crane can use batteries to ensure the continuity of production and transportation work. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the circuit diagram of RTG working mode 1 of the present invention;

[0025] Figure 2 This is the circuit diagram of RTG working mode 2 of the present invention;

[0026] Figure 3 This is the circuit diagram of RTG working mode 3 of the present invention. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0028] Example 1

[0029] like Figure 1 As shown, a tire crane control system with battery transfer includes an electrical room, which contains a mains power supply line, a mains power supply line, an RTG auxiliary power supply, an AC / DC rectifier, and an inverter and a brake unit of each operating mechanism of the RTG connected to the AC / DC rectifier via a DC bus, wherein the inverter includes a lifting inverter, a trolley sea side inverter, a trolley land side inverter, and a trolley inverter. In addition, the electrical control equipment necessary for the normal operation of the RTG is installed in the electrical room.

[0030] The above is the RTG working mode 1 without battery transfer (existing control circuit): Figure 1 As shown, RTG obtains AC380V power from the mains in the mains power supply area. The three-phase AC power is divided into two parts: one part is converted into DC voltage through the AC / DC rectifier, and the DC busbar is used to supply power to the inverters of each operating mechanism of the RTG. The inverter drives the corresponding motor to operate according to the on-board PLC instructions to realize the RTG handling function.

[0031] One part provides RTG auxiliary power, supplying working power for RTG lighting, control, steering pump, solenoid valve, auxiliary motor, etc.

[0032] Example 2

[0033] like Figure 2 As shown, based on the above embodiment, a tire crane control system with battery transfer also includes a battery room. The installation position of the battery room is the position where the diesel generator set of the original tire crane control system is removed. The battery room includes a battery compartment and an electrical compartment. A lithium battery pack and a battery management control box are installed in the battery compartment. The lithium battery pack is a lithium iron phosphate battery pack. The battery management control box is integrated with a BMS battery management system. The BMS battery management system is used to monitor the amount of electricity stored in the lithium battery pack, the battery voltage, current, temperature and fault protection;

[0034] The electrical compartment is equipped with a DC / DC charging and discharging device, a CVCF constant voltage and frequency device, a unidirectional diode, a fuse, a circuit switch, a PLC and a monitoring system. The circuit switch includes ①③⑤⑥⑦⑧ circuit breakers and ②④ contactors. The circuit switch is controlled by the PLC and the monitoring system. Among them, ⑥⑦ circuit breakers have mechanical interlocking and cannot be closed at the same time.

[0035] The lithium battery pack is connected to the DC bus through ③ circuit breaker, ② contactor, DC / DC charging and discharging device, and ① circuit breaker in sequence; the RTG auxiliary power supply is connected to the mains through ⑦ circuit breaker, the CVCF constant voltage and frequency device is connected to the mains through ⑤ circuit breaker, the AC output end of the CVCF constant voltage and frequency device is connected to the RTG auxiliary power supply through ⑥ circuit breaker, and the DC output end of the CVCF constant voltage and frequency device is connected to the DC bus through ④ contactor, unidirectional diode, fuse and ① circuit breaker in sequence.

[0036] In addition, the electrical compartment also includes an LC filter and an emergency charger. The LC filter is connected between the CCVCF constant voltage and frequency device and the RTG auxiliary power supply. The LC filter is used to filter the AC power output by the CCVCF constant voltage and frequency device. The emergency charger is charged by the AC charging power supply.⑧ The circuit breaker is set at the input end of the emergency charger.

[0037] The PLC and monitoring system are connected to the DC / DC charging and discharging device and the BMS battery management system respectively, and are used for monitoring the DC / DC charging and discharging device, displaying the battery pack charging and discharging current, displaying fault records of the DC bus voltage and battery voltage, and interlocking with the RTG main control system, fault processing, and reading BMS data.

[0038] It should be noted that when the ⑤ circuit breaker in the battery room is disconnected and the ⑦ circuit breaker is closed, the RTG operates according to RTG working mode 1.

[0039] According to the above, based on the addition of the battery room of this solution, there are two RTG working modes. One is that the battery room is added, but the RTG works in the mains power supply area and obtains AC power from the mains in RTG working mode 2. The other is that the battery room is added, and the transition mode RTG working mode 3.

[0040] RTG working mode 2: Figure 2 As shown, when the RTG works in the mains power supply area and obtains AC power from the mains, circuit breakers ⑤ and ⑥ are closed, and the RTG obtains AC380V power from the mains in the mains power supply area. The three-phase AC power is divided into two parts: one part is converted into DC voltage through the AC / DC rectifier, and the DC busbar is used to supply power to the inverters of various operating mechanisms of the RTG. The inverter drives the corresponding motor to operate according to the on-board PLC instructions to realize the RTG handling function.

[0041] A part of it is passed through ⑤ circuit breaker--CVCF constant voltage and frequency device--⑨LC filter--⑥ circuit breaker--to provide RTG auxiliary power supply, supplying working power for RTG lighting, control, steering pump, solenoid valve, auxiliary motor, etc.

[0042] RTG working mode 3: Figure 3 As shown, this working mode is used for RTG battery transfer. When the RTG is disconnected from the mains power grid, the battery provides power for the RTG to operate. The circuit breakers ①③⑥ in the battery room are closed, and the contactors ②④ are closed under the control of the PLC. The battery releases electrical energy to provide power to the RTG in two ways:

[0043] The RTG is driven to move through the lithium battery pack, ③ circuit breaker, ② contactor, DC / DC charging and discharging device, ① circuit breaker, DC bus, trolley inverter, and trolley motor.

[0044] The other route goes through lithium battery--③ circuit breaker--② contactor--DC / DC charging and discharging device--fuse--⑩ unidirectional diode--④ contactor--CVCF constant voltage and frequency device--⑨LC filter--⑥ circuit breaker--to provide RTG auxiliary power supply, supply RTG lighting, control, steering pump, solenoid valve, auxiliary motor, etc. with working power, and provide RTG tire steering power and control.

[0045] In addition, it should be noted that, based on the above embodiment, this solution also includes three charging modes, which are as follows:

[0046] RTG battery charging mode 1: When the RTG is working in the mains power supply area, the BMS battery management system detects that the lithium battery pack is low on power and sends the detection information to the PLC and monitoring system. The PLC and monitoring system close the ② contactor, ① circuit breaker, and ③ circuit breaker in the battery room. The mains power is transmitted to the lithium battery pack through the AC / DC rectifier--① circuit breaker--DC / DC charging and discharging device--② contactor. The BMS battery management system controls the automatic charging of the lithium battery pack.

[0047] RTG battery charging mode 2: A battery room is added, but it is still in the mains area and powered by the mains. The battery is charged by recycling potential energy. When the RTG lifts and lowers heavy objects, the potential energy is fed back to the DC bus. This energy can be used to charge the battery and stored in the battery as electrical energy. The excess energy will be consumed by the braking resistor to maintain the stability of the DC bus voltage. Charging path: (lifting and lowering-lifting and lowering) DC bus--① circuit breaker--DC / DC charging and discharging device--② contactor--③ circuit breaker--lithium battery pack, the BMS battery management system controls the automatic charging of the battery.

[0048] RTG battery charging mode 3: Added a battery room, using the emergency charger to charge the RTG battery, suitable for RTG in the maintenance site, leaving after the maintenance is completed. Disconnect the ② contactor, in case of an accident, it can provide AC charging power to charge the battery separately, charging path: AC charging power supply--emergency charger lithium battery pack, BMS battery management system controls the battery to charge automatically.

[0049] The above is a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A tire crane control system with battery transfer, comprising an electrical room and a battery room, wherein the electrical room contains a mains power supply line, an RTG auxiliary power supply, an AC / DC rectifier, and an inverter and a brake unit of each operating mechanism of the RTG connected to the AC / DC rectifier via a DC bus; Features: The installation location of the battery room is the location where the diesel generator set was removed from the original tire crane control system. The battery room includes a battery compartment and an electrical compartment. A lithium battery pack and a battery management control box are installed in the battery compartment. A BMS battery management system is integrated in the battery management control box. The BMS battery management system is used to monitor the amount of electricity stored in the lithium battery pack, the voltage, current, temperature and fault protection of the battery; The electrical compartment is equipped with a DC / DC charging and discharging device, a CVCF constant voltage and frequency device, a unidirectional diode, a fuse, a circuit switch, a PLC and a monitoring system. The circuit switch includes ①③⑤⑥⑦⑧ circuit breakers and ②④ contactors. The circuit switch is controlled to open and close through the PLC and the monitoring system. The lithium battery pack is connected to the DC busbar in sequence through ③ circuit breaker, ② contactor, DC / DC charging and discharging device, and ① circuit breaker; The RTG auxiliary power supply is connected to the mains through ⑦ circuit breaker, the CVCF constant voltage and constant frequency device is connected to the mains through ⑤ circuit breaker, the AC output end of the CVCF constant voltage and constant frequency device is connected to the RTG auxiliary power supply through ⑥ circuit breaker, and the DC output end of the CVCF constant voltage and constant frequency device is connected to the DC bus through ④ contactor, unidirectional diode, fuse ① circuit breaker in sequence; The PLC and monitoring system are respectively connected to the DC / DC charging and discharging device and the BMS battery management system, and are used for monitoring the DC / DC charging and discharging device, displaying the battery pack charging and discharging current, displaying fault records of the DC bus voltage and battery voltage, and interlocking with the RTG main control system, fault processing, and reading BMS data; When the RTG works in the mains power supply area and obtains AC power from the mains, the ⑤ circuit breaker and ⑥ circuit breaker are closed, and the mains power is divided into two parts. One part is converted into DC voltage through the AC / DC rectifier, and supplied to the inverters of each operating mechanism of the RTG through the DC busbar. The inverter drives the corresponding motor to operate according to the on-board PLC instructions; the other part supplies power to the RTG auxiliary power supply through the ⑤ circuit breaker, the CVCF constant voltage and frequency device, and the ⑥ circuit breaker. The RTG auxiliary power supply supplies RTG lighting, control, steering pump, solenoid valve, and auxiliary motor; When the RTG is disconnected from the mains power grid, the ①③⑥ circuit breakers are closed, and the ②④ contactors are closed, and the lithium battery pack releases electric energy to provide it to the RTG in two ways, one way of supplying power to each operating mechanism of the RTG through the lithium battery pack, ③ circuit breaker, ② contactor, DC / DC charging and discharging device, ① circuit breaker, DC bus, and inverter; The other route provides auxiliary power to the RTG via lithium battery pack, ③ circuit breaker, ② contactor, DC / DC charging and discharging device, fuse, unidirectional diode, ④ contactor, CVCF constant voltage and frequency device, and ⑥ circuit breaker; When the RTG is working in the mains power supply area, the BMS battery management system detects that the lithium battery pack is low on power and sends the detection information to the PLC and monitoring system. The PLC and monitoring system close the contactor ②, the circuit breaker ①, and the circuit breaker ③ in the battery room. The mains power is supplied to the lithium battery pack through the AC / DC rectifier, the circuit breaker ①, the DC / DC charging and discharging device, and the contactor ②. The BMS battery management system controls the automatic charging of the lithium battery pack. The electrical compartment also includes an LC filter, which is connected between the CCVCF constant voltage and constant frequency device and the RTG auxiliary power supply, and is used for filtering the AC power output by the CCVCF constant voltage and constant frequency device; The lithium battery pack is a lithium iron phosphate battery pack, and an emergency charger is also provided in the electrical compartment. The emergency charger is charged by an AC charging power supply, and the circuit breaker is provided at the input end of the emergency charger; The inverter includes a lifting inverter, a large vehicle sea side inverter, a large vehicle land side inverter and a small vehicle inverter.

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