CN111404261A - Standby power supply control device of electro-hydraulic actuator - Google Patents

Abstract

The utility model provides an electricity liquid actuating mechanism's standby power control device, by detection module, external control interface, main control unit, power conversion module, position sensor, drive module, hydraulic system constitute, increased energy storage power supply unit and wireless communication unit in the device, can realize continuing to carry out electricity liquid actuating mechanism's on-off operation with the remote control mode under the circumstances of outage. The energy storage power supply unit is a super capacitor bank and is formed by connecting 10 single capacitors of 2.75V 30F in series, two ends of each super capacitor are connected with a BW6101 module in parallel, and the voltage of each capacitor is guaranteed not to exceed 2.65V through an MOS tube leakage loop. The wireless communication unit uses a 4G wireless communication network device of GPRS. The invention has the beneficial effects that: the remote control can be carried out through a mobile phone or a computer of the Internet under the condition of power failure, and the action of the electro-hydraulic actuating mechanism is continuously executed, so that the occurrence of accidents is avoided.

Description

A backup power control device for an electro-hydraulic actuator

technical field

The invention relates to a backup control device, in particular to a backup power control device of an electro-hydraulic actuator.

Background technique

Electro-hydraulic actuators have the advantages of large thrust, fast speed, and good anti-deviation ability, and are widely used in industrial control systems such as metallurgy, electric power, and petrochemicals. In the case of a power failure, the valve of the electro-hydraulic actuator needs to be closed or opened urgently, and there is no backup power supply as an emergency power supply, which can easily expand the accident and cause equipment damage or personal injury.

The existing protection device can only be switched on and off according to the preset settings. The operator does not know whether the valve is switched in place. When the equipment is repaired at this time, it is very easy to cause malfunction. This is the existing electro-hydraulic actuator protection device. Not perfect place. In order to prevent the occurrence of such accidents and reduce on-site losses as much as possible, it is urgent to design a backup power control device that can still ensure the normal opening and closing of valves by the electro-hydraulic actuator under such circumstances.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a backup power control device for an electro-hydraulic actuator, which is a remote control system based on a 4G network and a super capacitor as a backup power source, so as to solve some of the above-mentioned problems in the background art.

To achieve the above object, the present invention has adopted the following technical solutions:

A backup power control device for an electro-hydraulic actuator, consisting of a detection module, an external control interface, a main controller, a power conversion module, a position sensor, a drive module, and a hydraulic system, characterized in that an energy storage power supply is added to the device The unit and the wireless communication unit can continue to carry out the on-off operation of the valve of the electro-hydraulic actuator by remote control in the case of power failure.

The energy storage power supply unit may be a battery pack or a supercapacitor pack, and the output working voltages are all DC24V.

The battery pack is composed of two 12V/5Ah batteries connected in series.

The supercapacitor bank is a capacitor bank made of 10 2.75V 30F single capacitors in series. A BW6101 module is connected in parallel at both ends of each supercapacitor, and the voltage of each capacitor is guaranteed by a MOS tube discharge loop. does not exceed its 2.65V threshold.

The wireless communication unit may be a device using a local area wireless communication network, or a device using a 4G wireless communication network of GPRS.

The device using the GPRS 4G wireless communication network adopts the ATK-M750 4G DTU wireless communication module, which realizes mutual communication through the serial port connection of the main controller.

The external control interface is divided into two parts: the external terminal and the RS485 communication interface. The internal circuit of the external terminal is isolated by optocoupler to realize the wired connection control between the equipment and the control room; the RS485 communication interface directly adopts Jinshengyang.

The TD301DRS485 bidirectional isolation module can communicate with other sensor modules of the actuator and connect with the control room as the bus interface of the main controller.

The main controller uses microcontroller STM32F103RCT6 as the core control unit, ARM architecture, Cortex-M core, main frequency 72MHz, 256(KB) FLASH, 48(KB) RAM, and 51 general-purpose I/O ports.

The hydraulic system uses bladder-type accumulator as the power source of the actuator after power failure, and switches the pressure relief path of the accumulator to drive the swing cylinder through the 24V reversing valve, thereby realizing the purpose of opening and closing the valve.

Compared with the prior art, the beneficial effects of the present invention are:

On the basis of conventional electro-hydraulic actuators, a backup power control device with a 4G wireless communication network is constructed, which can have two control modes, RS485 bus and 4G network, under abnormal conditions such as power failure. The circuit structure is simple and the flexibility is strong, which not only satisfies the quick switching function of the valve under normal conditions, but also realizes the remote control through the mobile phone or the computer of the Internet when the wired mode and the bus mode fail, which not only reduces the work of the operator The strength also reduces the risk of accidents on site and prevents larger accidents from occurring.

Description of drawings

FIG. 1 is a schematic structural diagram of the control system of the present invention.

Figure 2 is a schematic diagram of the hydraulic system of the present invention.

FIG. 3 is a circuit diagram of the automatic switching of the power supply of the present invention.

4 is a circuit diagram of a backup power supply (supercapacitor bank) of the present invention.

FIG. 5 is a circuit diagram of the 4G communication module of the present invention.

FIG. 6 is a schematic diagram of 4G wireless communication according to the present invention.

Detailed ways

The specific structure of the backup power control device of the electro-hydraulic actuator of the present invention will be further described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 , it is a backup power control device of an electro-hydraulic actuator of the present invention.

The device consists of a detection module, an external control interface, a main controller, a power conversion module, a position sensor, a drive module, an energy storage power supply unit, a wireless communication unit and a hydraulic system. The detection module is used to detect whether the external power supply of the system is abnormal. If it is abnormal, it will switch to the energy storage power supply unit. The energy storage power supply unit supplies power to the entire electro-hydraulic actuator system, and at the same time, the voltage is converted into the 5V required by the system through the power conversion module. , 3.3V voltage, power supply for main controller and interface circuit. After the main controller receives the signal from the detection module, it enters the power-off working state and checks whether the external terminal and the RS485 bus interface receive an action command, and at the same time sends the status information collected by the current main controller to the cloud platform through the serial port and wireless communication unit. (such as encoder information, etc.). The mobile phone APP or the computer connected to the Internet can also access the cloud platform. After viewing the information, it can also send commands to the wireless communication unit. The wireless communication unit transmits the received command information to the main controller through the serial port, and the main controller receives the data. After the command, control the conduction of the NMOS tube and then control the conduction of the solenoid valve, so that the actuator of the hydraulic system continues to work to realize the opening and closing functions of the valve.

The energy storage power supply unit may be a battery pack or a supercapacitor pack, and the output working voltages are all DC24V. If a battery pack is used, it consists of two 12V/5Ah batteries connected in series. If supercapacitors are used, 10 2.75V 30F single capacitors are used in series to form a capacitor bank. Both ends of each supercapacitor are connected in parallel with a BW6101 module, and the MOS tube discharge loop is used to ensure that the voltage of each capacitor is not exceeds its 2.65V threshold.

The wireless communication unit may be a device using a local area wireless communication network, or may be a device using a GPRS 4G wireless communication network.

The device using GPRS 4G wireless communication network adopts ATK-M750 4G DTU wireless communication module, which realizes mutual communication through the serial connection of the main controller. This module supports five modes and fourteen frequencies, and the full Netcom working mode.

The external control interface is divided into two parts: the external terminal and the RS485 communication interface. The internal circuit of the external terminal is isolated by optocoupler to realize the wired connection control between the equipment and the control room; the RS485 communication interface directly adopts Jinshengyang TD301DRS485 two-way isolation module, namely It can communicate with other sensor modules of the actuator and can be connected with the control room as the bus interface of the main controller.

The main controller uses the microcontroller STM32F103RCT6 as the core control unit, ARM architecture, Cortex-M core, main frequency 72MHz, 256(KB) FLASH, 48(KB) RAM, 51 general-purpose I/O ports, running FreeRTOS real-time operating system to meet the real-time requirements of the system.

Figure 2 shows the hydraulic principle diagram of the system, in which the part selected by the box is an important component of the hydraulic system for power failure protection. The working mode is to open the solenoid valve 1 to close the pressure relief passage of the accumulator when the external power supply is normal, and the motor drives the oil pump to charge the accumulator to the system pressure through the one-way valve; when the main controller detects that the on-site power supply is abnormal, it may accept When the control command is reached, the solenoid valve 1 is de-energized, the pressure relief passage of the accumulator is opened, and the main controller drives the reversing valve 2 to drive the swing cylinder to rotate to realize the valve's on-off function. The accumulator is a bladder-type accumulator, which can be used as the power source of the actuator after power failure, and the pressure relief path of the accumulator can be switched through the 24V reversing valve.

As shown in Figure 3, the power supply detection and switching backup power supply circuit are shown. The power failure detection module is divided by R7 and R8 to generate a reference input voltage of about 18V. When the external power supply is lower than 18V, the op amp outputs a low level, the optocoupler T3 and T2 are turned on, and R1 has a current flowing through it to make T1 is turned on and started, and the supercapacitor bank continues to supply power to the device through the step-down module. Since the optocoupler is turned on, the external power supply abnormal signal of low level to the microcontroller is also provided. The main controller performs real-time data processing, and the power supply and I/O ports of the chip are isolated and processed to improve the reliability of the system.

Figure 4 shows the supercapacitor bank circuit. Supercapacitors have the advantages of small size, but with farad-level capacitance, long life, and high discharge current. However, the rated voltage of a single supercapacitor is low. In order to meet the 24V voltage requirement of the solenoid valve, the device uses 10 2.75V 30F series-connected supercapacitor banks as the backup power supply. At the same time, each supercapacitor is connected in parallel with a BW6101 module for protection. When the terminal voltage of a single capacitor exceeds the threshold voltage of the BW6101 chip (2.65V), the higher voltage is released through the pressure relief circuit composed of resistors and MOS tubes, ensuring the supercapacitor. The working reliability of the capacitor bank.

Figure 5 shows the circuit diagram of the ATK-M750 module. The system uses 5V to supply power for it, and this module is connected to the serial port of the main controller to communicate with each other. The SIM card slot is connected to the 10, 11, 12, and 13 pins of the module and is filtered by a 33PF capacitor, and each line is protected by an ESD chip. The reset pin of this module can be controlled by keys, or by the main controller.

Figure 6 is a schematic diagram of the structure of the remote communication system. When the main controller sends information, the main controller communicates with the 4G module through the serial port, and then the 4G module transmits the data to the cloud platform through the 4G network. The cloud platform sends data to the 4G module, and the 4G module enables the main controller to receive data through the serial port.

The working process of the present invention is as follows: when the external power supply is normal, the solenoid valve 1 is energized to work, the motor drives the oil pump to charge the accumulator to the system pressure through the one-way valve, and the external power supply charges the super capacitor bank. When the external power supply is abnormal, the solenoid valve 1 loses power, the pressure relief circuit of the accumulator is opened, the power failure detection module will send a signal to the main controller, and at the same time, the super capacitor bank will be switched to continue to supply power to the system. The main controller receives the signal and enters the power-off working state and checks whether the external terminal and the RS485 bus interface receive the action command, and at the same time communicates with the 4G module through the serial port to send the current main controller to the cloud platform to collect the status information. The user can send commands to the system through RS485 bus and wireless remote control. The main controller receives the command information and controls the electromagnetic reversing valve 2 through the drive module to finally drive the rotary switch valve of the swing cylinder. At the same time, the main controller passes the encoder. The collected valve position information will send data to the cloud platform in real time through the 4G module, and users can view the current valve position through mobile APP and other devices.

Compared with the prior art, the beneficial effects of the present invention are:

On the basis of conventional electro-hydraulic actuators, a backup power control device with a 4G wireless communication network is constructed, which can have two control modes, RS485 bus and 4G network, under abnormal conditions such as power failure. The circuit structure is simple and the flexibility is strong, which not only satisfies the quick switching function of the valve under normal conditions, but also realizes the remote control through the mobile phone or the computer of the Internet when the wired mode and the bus mode fail, which not only reduces the work of the operator The strength also reduces the risk of accidents on site and prevents larger accidents from occurring.

Claims (9)

1. A backup power control device for an electro-hydraulic actuator, consisting of a detection module, an external control interface, a main controller, a power conversion module, a position sensor, a drive module, and a hydraulic system, is characterized in that a storage device is added in the device. The power supply unit and the wireless communication unit can continue the on-off operation of the valve of the electro-hydraulic actuator by remote control in the case of power failure. 2. The backup power supply control device of an electro-hydraulic actuator according to claim 1, wherein the energy storage power supply unit can be a battery pack or a supercapacitor pack, and the output working voltages are both It is DC24V. 3 . The backup power control device for an electro-hydraulic actuator according to claim 2 , wherein the battery pack is composed of two 12V/5Ah batteries connected in series. 4 . 4. The backup power control device of an electro-hydraulic actuator according to claim 2, wherein the supercapacitor bank is a capacitor bank formed by using 10 2.75V 30F single capacitors in series, and each supercapacitor bank is Both ends of the capacitor are connected in parallel with a BW6101 module, and the MOS tube discharge loop is used to ensure that the voltage of each capacitor does not exceed its 2.65V threshold. 5. The backup power control device of an electro-hydraulic actuator according to claim 1, wherein the wireless communication unit can be a device using a local area wireless communication network, or a 4G wireless device using GPRS A device for a communication network. 6. the backup power supply control device of a kind of electro-hydraulic actuator according to claim 5, is characterized in that, the device of the 4G wireless communication network that uses GPRS, what adopts is ATK-M750 4G DTU wireless communication module, Through the serial port connection of the main controller, mutual communication is realized. This module supports five modes and fourteen frequencies, and the full Netcom working mode. 7. The backup power control device for an electro-hydraulic actuator according to claim 1, wherein the external control interface is divided into two parts: an external terminal and an RS485 communication interface, and the internal circuit of the external terminal adopts an optocoupler It is isolated to realize the wired connection control between the equipment and the control room; the RS485 communication interface directly adopts the Jinshengyang TD301DRS485 two-way isolation module, which can communicate with other sensor modules of the actuator and connect with the control room as the bus interface of the main controller. 8. The backup power supply control device of a kind of electro-hydraulic actuator according to claim 1, is characterized in that, described main controller selects microcontroller STM32F103RCT6 as core control unit, ARM architecture, Cortex-M kernel, Main frequency 72MHz, 256 (KB) FLASH, 48 (KB) RAM, 51 general-purpose I/O ports. 9 . The backup power control device for an electro-hydraulic actuator according to claim 1 , wherein the hydraulic system selects a bladder-type accumulator as the power source of the actuator after power failure, and the 24V commutation The valve is used to switch the pressure relief path of the accumulator to drive the swing cylinder, thereby realizing the purpose of opening and closing the valve.

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