Digital power supply system and method for high-radiation boron-containing underwater electrical discharge machining

Abstract

The invention belongs to the technical field of special maintenance in a high-radiation environment of a nuclear power plant, and particularly relates to a digital power supply system and method for high-radiation boron-containing underwater electrical discharge machining. The AC external power supply is connected with an external power supply; the AC external power supply is connected with a rectification module; a synchronous trigger signal is input into the rectification module; the rectification module is connected with a filtering module; the protection module and the monitoring module respectively output signals to the rectification module, the storage module and the filtering module. The device has the beneficial effects that controllable and stable discharge machining operation power supply output is provided in the electric spark discharge machining operation process in a high-radiation boron-containing water environment such as a nuclear power plant, and the problem that a conventional discharge machining power supply cannot be used in the high-radiation boron-containing water environment is solved.

Description

Technical Field

[0001] This invention belongs to the field of special maintenance technology in the high-radiation environment of nuclear power plants, and specifically relates to a digital power supply system and method for underwater discharge machining of boron-containing materials under high radiation. Background Technology

[0002] Various defects that occur during the operation of nuclear power plants require the cutting, replacement, or reshaping of faulty equipment. The maintenance process involves cutting, hole machining, surface smoothing, and thread machining. Due to the high radiation of the pressure vessels and other main equipment of the operating units, they must always be in a boron-containing water environment. The work areas of highly radioactive equipment that is shielded in a boron-containing water environment are inaccessible to personnel and conventional processing equipment. There is a lack of completion inspection methods for conventional processing methods. Electrical discharge machining is a suitable process for the working environment requirements.

[0003] Existing electrical discharge machining (EDM) technologies are all based on power supply discharge machining under oil-insulating media within a workshop. These technologies are relatively mature, and various control methods have been researched both domestically and internationally. They are commonly found on various CNC EDM machine tools. The main characteristics of this type of equipment are high machining accuracy, but the insulating medium is oil, resulting in a large, immobile volume and requiring in-workshop machining. Furthermore, there are no related processes or applications that address radiation resistance or operation in boron-containing water, particularly when temperature and boron concentration in boron-containing water change. Summary of the Invention

[0004] The purpose of this invention is to provide a digital power supply system and method for underwater electrical discharge machining (EDM) in high-radiation boron-containing environments, which outputs a controlled DC voltage and solves the problem that conventional EDM equipment cannot be used in high-radiation and boron-containing water environments.

[0005] The technical solution of the present invention is as follows: A digital power supply system for high-radiation boron-containing underwater discharge processing includes an external AC power supply, a rectifier module, a storage module, a filter module, a power switch module, a discharge output module, a sampling module, a protection module, and a monitoring module. The external AC power supply is connected to an external power source and is connected to the rectifier module. A synchronous trigger signal is input to the rectifier module. The rectifier module is connected to the filter module. The output of the rectifier module is sent to the storage module. The output of the storage module is sent to the filter module. The filter module is connected to the power switch module and is connected to the discharge output module. The discharge output module outputs signals to the sampling module, the protection module, and the monitoring module, respectively. The sampling module, the protection module, and the monitoring module output signals to the rectifier module, the storage module, and the filter module, respectively.

[0006] The external AC power supply input is AC380V 50Hz, and it has input overvoltage and undervoltage protection functions.

[0007] The rectifier module has a constant voltage output of DC50V~300V that is continuously adjustable, a constant current output of 0~150A that is continuously adjustable, a pulse width of 1-2048us that is continuously adjustable, and a duty cycle of 0-100% that is continuously adjustable.

[0008] The filtering module selectively allows or suppresses signals of specific frequencies.

[0009] The power switch module controls the switching state of the circuit.

[0010] The discharge output module controls the power output and has output voltage limiting, current limiting, overcurrent, and overvoltage protection functions.

[0011] The synchronization trigger signal is used to trigger the rectifier module to work. When an external power supply is input, the rectifier will not start working immediately. The rectifier will start working only after the synchronization trigger signal is received.

[0012] A method for applying a digital power supply to high-radiation boron-containing underwater discharge machining includes the following steps: Step 1: Input DC power supply AC380V 50Hz, constant voltage output DC50V~300V continuously adjustable, constant current output current 0~150A continuously adjustable, pulse width 1-2048us continuously adjustable, duty cycle 0-100% continuously adjustable; Step 2: Complete all control functions, including voltage regulation, protection, communication, and monitoring; Step 3: When there is no power supply at the construction site or when the external power supply is lost, provide power to the electrical discharge machining device; Step 4: Response and correction to changes in ambient temperature and conductivity in a boron-containing water environment; Step 5: Work in conjunction with other functional modules to carry out various electrical discharge machining operations.

[0013] The beneficial effects of this invention are as follows: This invention enables controllable and stable power output for electrical discharge machining (EDM) operations in high-radiation boron-containing water environments such as nuclear power plants, solving the problem that conventional EDM power supplies cannot be used in high-radiation and boron-containing water environments. It provides a digital power system and method for underwater EDM for non-movable equipment in the field of special maintenance technology in high-radiation boron-containing water environments of nuclear power plants. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a digital power system architecture for high-radiation boron-containing underwater discharge processing provided by the present invention.

[0015] In the diagram, 1. AC external power supply; 2. Rectifier module; 3. Storage module; 4. Filtering module; 5. Power switch module; 6. Discharge output module; 7. Sampling module; 8. Protection module; 9. Monitoring module; 10. Synchronous trigger signal; 11. HMI and control system. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] The present invention provides a digital power supply system and method for high-radiation boron-containing underwater discharge machining. Its working principle is as follows: After receiving an external AC power supply and a synchronous trigger signal, the rectifier module begins power rectification. Part of the rectified power is stored in a storage module, and the other part flows to a filter module. The filter module filters the power to resolve harmonic interference. The filtered power then flows to a power switch module, which corrects the power supply according to changes in ambient temperature and conductivity. The corrected power is controlled by a discharge output module, which has output voltage limiting, current limiting, overcurrent, and overvoltage protection functions. After power output, the sampling module, monitoring module, and protection module simultaneously monitor and protect the digital power system and provide feedback to the rectifier module, filter module, and power switch module, thereby providing timely and efficient controllable and stable power output for discharge machining operations.

[0018] like Figure 1 As shown, a digital power supply system for high-radiation boron-containing underwater discharge machining includes an AC external power supply 1, a rectifier module 2, a storage module 3, a filter module 4, a power switch module 5, a discharge output module 6, a sampling module 7, a protection module 8, and a monitoring module 9. The AC external power supply 1 is connected to an external power source (AC 380V, 50Hz). The AC external power supply 1 is connected to the rectifier module 2. The HMI and control system 11 outputs a synchronous trigger signal 10 to the rectifier module 2. The rectifier module 2 is connected to the filter module 4. The output of the rectifier module 2 is sent to the storage module 3. The output of the storage module 3 is sent to the filter module 4. The filter module 4 is connected to the power switch module 5. The power switch module 5 is connected to the discharge output module 6. The discharge output module 6 outputs signals to the sampling module 7, the protection module 8, and the monitoring module 9, respectively. The sampling module 7, the protection module 8, and the monitoring module 9 output signals to the rectifier module 2, the storage module 3, and the filter module 4, respectively, and simultaneously feed back working information to the HMI and control system 11.

[0019] Among them: AC external power supply 1 input power AC380V 50Hz, with input overvoltage and undervoltage protection functions; Rectifier Module 2 is a constant voltage DC pulse power supply with an output of DC50V~300V continuously adjustable, a constant current output of 0~150A continuously adjustable, a pulse width of 1-2048us continuously adjustable, and a duty cycle of 0-100% continuously adjustable. Storage module 3 stores power, which can provide power to the electrical discharge processing device when there is no power supply at the construction site or when the external power is lost, ensuring safe and reliable on-site operation. The filter module 4 selectively passes through or suppresses signals of specific frequencies, which can effectively solve the problem of harmonic interference and prevent and resolve various problems caused by harmonics. The power switch module 5 controls the switching state of the circuit and is specially designed to control the digital power system, enabling it to respond to and correct for changes in ambient temperature and conductivity in a boron-containing water environment. The discharge output module 6 controls the power output and has protection functions such as output voltage limiting, current limiting, overcurrent, and overvoltage. It also provides feedback alarms to the HMI and control system 11 via the control cable. The sampling module 7 samples and detects the output power supply to ensure that it meets the operating requirements. If it does not meet the requirements, it feeds back to the rectifier module, filter module, power switch module, and control system to correct the output power supply. The protection module 8 collects the output signal, performs A / D conversion, and then feeds it back to the control system to protect the digital power system. In abnormal situations, it is used to correct the output power and disconnect the digital power system. Monitoring module 9 is used to monitor changes in ambient temperature and conductivity in a boron-containing water environment. After A / D conversion, the changes are fed back to the control system, rectifier module, filter module and power switch module to adjust and repair the output power supply according to the actual working conditions. The synchronous trigger signal 10 is used to trigger the rectifier module to work. Rectification will not begin immediately after external power is input; it will only begin upon receiving the synchronous trigger signal. The synchronous trigger signal 10 is a trigger signal generated by the control system based on the set parameters input through the HMI (Human Machine Interface).

[0020] The HMI and control system 11 uses a 32-bit high-speed single-chip microcomputer as the control core. It uses the HMI human-machine interface to complete its own output settings, and at the same time, it establishes a communication connection with the digital control system participating in the EDM to complete the settings. It also has a communication interface to connect with field equipment systems such as tooling systems, servo power systems, filtration systems, flushing systems, waterproof systems, and grounding systems, and to provide feedback on system working information to achieve stable and efficient EDM operations.

[0021] A method for applying a digital power supply to high-radiation boron-containing underwater discharge machining includes the following steps: After the system is powered on, each module completes its self-test and sends standby information to the HMI and control system module 11. After the HMI human-machine interface is initialized, it displays the status of each module and can receive parameter inputs. After the processing parameters are set, the control system reads the parameters and writes them into each module to complete the initialization.

[0022] After the operator sends a start command through the HMI (Human Machine Interface), the control system outputs a synchronous trigger signal 10 according to the set parameters, which is input to the rectifier module 2. The rectifier module 2 then outputs a DC pulse according to the synchronous trigger signal. Simultaneously, the control system activates the storage module 3 and the filter module 4, putting them into operation. After the operator sends a power output command through the HMI human-machine interface, the control system controls the power switch module 5 to turn on according to the set parameters, and outputs a DC pulse to the discharge output module 6. After passing through the voltage limiting, current limiting, overcurrent, and overvoltage protection circuits, the pulse is output to the output interface. Sampling module 7 and protection module 8 are connected to the output circuit to collect the output DC pulse information; monitoring module 9 is connected to external temperature and conductivity sensors to collect on-site boron-containing water environment information. Step 1: The digital power supply is a DC power supply with an input of AC380V 50Hz, a constant voltage output of DC50V~300V continuously adjustable, a constant current output of 0~150A continuously adjustable, a pulse width of 1-2048us continuously adjustable, and a duty cycle of 0-100% continuously adjustable. Step 2: Using a 32-bit high-speed microcontroller as the control core, and the HMI (Human Machine Interface) and the high-speed 32-bit microcontroller as core components, various control functions are completed, such as voltage regulation control, protection, communication, and monitoring. Step 3: The digital power supply has a power storage module, which can provide power to the electrical discharge machining device when there is no power supply at the construction site or when the external power supply is lost, so as to ensure the safety and reliability of on-site operation. Step 4: This digital power supply features input over / under voltage protection, output voltage limiting, current limiting, overcurrent and overvoltage protection, overheat protection, and monitoring. Furthermore, the power supply's control system is specially designed to respond to and correct for changes in ambient temperature and conductivity in a boron-containing water environment. Step 5: This digital power supply has a standard external communication interface, which can be used with a digital control system and other functional modules such as servo drivers to carry out various electrical discharge machining operations. Step 6: This digital pulse power supply is modularly designed. The power current output cable and sampling feedback signal can be extended to a distance of more than 30m to meet the radiation shielding distance requirements of the main equipment in high radiation environments and the distance requirement of no more than 20m for underwater processing containing boron.

[0023] The aforementioned digital power supply uses a 32-bit high-speed microcontroller as its control core and employs an HMI (Human-Machine Interface) to complete its own output settings. It can also establish a communication connection with the digital control system involved in the electrical discharge machining (EDM) process to complete settings. It integrates with field equipment systems such as tooling systems, servo power systems, filtration systems, flushing systems, waterproofing systems, and grounding systems to achieve stable and efficient EDM operations. Through different parameter settings, controlled processing speed, surface hardness, elastic modulus, contour, and roughness of the processed material can be achieved in a high-radiation boric acid water environment.

[0024] The key features of this invention are: a modularly designed underwater electrical discharge machining digital power supply with communication control and monitoring functions; power current output cables and sampling feedback signals can be extended to a distance of more than 30m; it can adapt to signal interference from radiation in high-irradiation environments and provide controllable and stable power output for electrical discharge machining operations in boron-containing water environments at depths not exceeding 20m, adapting to changes in ambient temperature and conductivity.

[0025] The aforementioned digital power supply system and device, with a 32-bit high-speed microcontroller as the control core, uses an HMI (Human-Machine Interface) to complete its own output settings. It can also establish a communication connection with other digital power supply systems involved in electrical discharge machining (EDM) to complete settings. It integrates with field equipment systems such as tooling systems, servo power systems, filtration systems, flushing systems, waterproofing systems, and grounding systems to achieve stable and efficient EDM operations. Through different parameter settings, the processing speed, surface hardness, elastic modulus, contour, and roughness of the processed material can all be controlled in a high-radiation boric acid water environment.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some or all of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A digital power supply system for high radiation boron-containing underwater electro-discharge machining, characterized by: The AC external power supply includes an external power supply, a rectifier module, a storage module, a filter module, a power switch module, a discharge output module, a sampling module, a protection module and a monitoring module, the AC external power supply is connected with the external power supply, the AC external power supply is connected with the rectifier module, a synchronous trigger signal is input into the rectifier module, the rectifier module is connected with the filter module, the rectifier module is output to the storage module, the storage module is output to the filter module, the filter module is connected with the power switch module, the power switch module is connected with the discharge output module, the discharge output module is respectively output to the sampling module, the protection module and the monitoring module, the sampling module, the protection module and the monitoring module are respectively output signals to the rectifier module, the storage module and the filter module.

2. A digital power supply system for high radiation boron- containing underwater electro-discharge machining as claimed in claim 1, characterized in that: The AC external power supply input power supply is AC380V 50Hz, and has input overvoltage and undervoltage protection functions.

3. A digital power supply system for high radiation boron- containing underwater electro-discharge machining as claimed in claim 1, characterized in that: The rectifier module has constant voltage output DC 50V-300V, constant current output current 0-150A, pulse width 1-2048us and duty cycle 0-100% which are continuously adjustable.

4. A digital power supply system for high radiation boron- containing underwater electro-discharge machining as claimed in claim 1, characterized in that: The filter module selectively passes or suppresses signals of specific frequencies.

5. A digital power supply system for high radiation boron- containing underwater electro-discharge machining as claimed in claim 1, characterized in that: The power switch module controls the switching state of the circuit.

6. A digital power supply system for high radiation boron- containing underwater electro-discharge machining as claimed in claim 1, characterized in that: The discharge output module controls the power output, and has output voltage limiting, current limiting, overcurrent and overvoltage protection functions.

7. A digital power supply system for high radiation boron- containing underwater electro-discharge machining as claimed in claim 1, characterized in that: The synchronous trigger signal is used to trigger the rectifier module to work, and the rectifier module does not work immediately after the external power supply is input, but works after receiving the synchronous trigger signal.

8. An application method of a digital power supply for high radiation boron-containing underwater electric discharge machining, comprising the following steps: Step 1: input DC power supply AC380V 50Hz, constant voltage output DC 50V-300V, constant current output current 0-150A, pulse width 1-2048us and duty cycle 0-100% which are continuously adjustable; Step 2: complete various control functions, including voltage stabilizing control, protection, communication and monitoring; Step 3: when the construction site does not have power supply conditions or the external power supply is lost, provide power supply for the electric discharge machining device; Step 4: in the boron-containing water environment, respond and correct the changes of environmental temperature and conductivity; Step 5: work with other functional modules to carry out various electric discharge machining work.

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