Welding current control system of steel grating plate press welder

Abstract

The invention discloses a welding current control system of a steel grating plate press welder. The welding current control system of the steel grating plate press welder comprises a welding power supply module, a position detection module, a microcomputer control module and a motor driving module, wherein the welding power supply module is used for providing stable direct-current welding current; the position detection module is used for acquiring position parameter information of the press welder and generating a feedback signal according to the position parameter information; the microcomputer control module is used for reading a feedback signal based on the STM32 platform, inputting the feedback signal into a closed-loop control algorithm and outputting a control signal; and the motor driving module is used for converting the control signal into a current signal for driving the press welder so as to realize automatic adjustment of the welding current. By implementing the embodiment, automatic adjustment of the welding current is realized, and the stability of the welding current is ensured, so that the welding quality of the steel grating plate is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of steel grating welding, specifically to the welding current control system of a steel grating press welder. Background Art

[0002] As an important steel grating product for construction and industry, steel gratings have been widely used in the industrial and construction fields of our country. It is made of carbon structural steel or low-alloy structural steel through a pressure welding process, and has the advantages of uniform mesh holes, strong bearing capacity, corrosion resistance, and convenient installation. With the continuous development of China's economy and the increasing investment in infrastructure construction, the market demand for steel gratings has been increasing year by year, and the industry scale has been continuously expanding. The main components of a steel grating pressure welding equipment include a flat steel feeding table, flat steel clamps, spacer clamps, a stepping mechanism, a welding mainframe, a welding transformer, a semi-automatic cross bar feeding device, a mobile trolley, a cutting device frame, an original plate storage device, a hydraulic station, an electrical system distribution cabinet, etc. According to the working procedures, it is divided into a feeding station, a welding station, a cutting end station, and a finished product support station. For feeding, flat steel is manually loaded, and then the cross bars are placed in the storage box. During operation, they are automatically fed, then automatically welded and pushed. After the original plate reaches the cutting station, the ends are automatically cut. After welding is completed, it is manually pulled out and then placed on the finished product support. The steel grating press welder improves production efficiency and reduces the labor intensity of workers. However, existing steel grating press welders often have problems such as high power consumption and inability to guarantee welding quality. Summary of the Invention

[0003] Aiming at the above at least one technical problem, the purpose of the present invention is to provide a welding current control system for a steel grating press welder.

[0004] On the one hand, an embodiment of the present invention includes a welding current control system for a steel grating press welder, which includes a welding power supply module, a position detection module, a microcomputer control module, and a motor drive module; wherein,

[0005] The welding power supply module is used to provide a stable DC welding current;

[0006] The position detection module is used to obtain the position parameter information of the press welder and generate a feedback signal according to the position parameter information;

[0007] The microcomputer control module is used to read the feedback signal based on the STM32 platform, input the feedback signal into a closed-loop control algorithm and output a control signal;

[0008] The motor drive module is used to convert the control signal into a current signal for driving the press welder to realize the automatic adjustment of the welding current.

[0009] Further, the welding power supply module includes a rectification circuit sub-module, a filter capacitor sub-module, an inverter circuit sub-module, and a voltage transformation sub-module:

[0010] The rectification circuit sub-module is used to rectify three-phase alternating current;

[0011] The filter capacitor sub-module is used to filter the rectified three-phase alternating current to obtain relatively smooth direct current;

[0012] The inverter circuit sub-module is used to invert the direct current into single-phase alternating current through an inverter circuit composed of IGBTs;

[0013] The voltage transformation sub-module is used to step down the single-phase alternating current and rectify and filter it again to output a stable DC welding current.

[0014] Further, the rectification circuit sub-module includes three thyristor units, and each thyristor unit includes two series-connected thyristors;

[0015] Among them, the three common poles of the thyristors are the input terminals of the rectification circuit sub-module; the three cathodes of the thyristors are connected in parallel and then connected to the positive pole of the filter capacitor sub-module; the three anodes of the thyristors are connected in parallel and then connected to the negative pole of the filter capacitor sub-module; the positive pole of the filter capacitor sub-module is also connected to the C pole of the upper-bridge-arm IGBT of the inverter circuit sub-module; the negative pole of the filter capacitor sub-module is also connected to the E pole of the lower-bridge-arm IGBT of the inverter circuit sub-module.

[0016] Further, the welding power supply module further includes a pre-start circuit sub-module and a drive circuit sub-module:

[0017] The pre-start circuit sub-module is used to output a first trigger pulse to trigger the thyristor and control the conduction of the thyristor;

[0018] The drive circuit sub-module is used to output a second trigger pulse to trigger the IGBT.

[0019] Further, the drive circuit sub-module includes a first judgment unit and a second judgment unit:

[0020] The first judgment unit is used to make the IGBT conduct when the second trigger pulse is at a positive level;

[0021] The second judgment unit is used to turn off the IGBT when the second trigger pulse is at a negative level.

[0022] Further, the inverter circuit sub-module includes 4 IGBTs;

[0023] Among them, the 4 IGBTs are connected in parallel in pairs to form the upper bridge arm and the lower bridge arm of the inverter circuit sub-module respectively.

[0024] Furthermore, the filter capacitor sub-module includes two capacitors connected in series, and each capacitor is connected in parallel with a voltage-sharing resistor.

[0025] Furthermore, the IGBT of the inverter circuit sub-module and the thyristor unit of the rectifier circuit sub-module are installed on a radiator and cooled by a fan.

[0026] Furthermore, the position detection module includes a position acquisition sub-module and a signal feedback sub-module;

[0027] The position acquisition sub-module is used to collect the position parameter information of the pressure welder through a position sensor; the position sensor is placed on the motor of the pressure welder;

[0028] The signal feedback sub-module is used to generate the feedback signal according to the position parameter information.

[0029] Furthermore, the microcomputer control module includes a reading sub-module, a control algorithm sub-module, and a signal output sub-module;

[0030] The reading sub-module is used to read the feedback signal based on the STM32 platform and monitor the feedback signal in real time;

[0031] The control algorithm sub-module is used to input the feedback signal into the closed-loop control algorithm; the closed-loop control algorithm includes a PID control algorithm and other advanced closed-loop control algorithms;

[0032] The signal output sub-module is used to adjust in real time according to the feedback signal and the closed-loop control algorithm through mechanisms such as timers and interrupts, and output the control signal based on the STM32 platform.

[0033] Compared with the related technology, the embodiments of the present application have the following beneficial effects:

[0034] The embodiment of the present application provides a welding current control system for a steel grating press welder, which includes a welding power supply module, a position detection module, a microcomputer control module, and a motor drive module. Among them, the welding power supply module is used to provide a stable DC welding current; the position detection module is used to obtain the position parameter information of the press welder and generate a feedback signal according to the position parameter information; the microcomputer control module is used to read the feedback signal based on the STM32 platform, input the feedback signal into a closed-loop control algorithm and output a control signal; the motor drive module is used to convert the control signal into a current signal for driving the press welder to realize the automatic adjustment of the welding current. Implementing the embodiment of the present application, the welding power supply uses a three-phase AC power supply input, which is inverted into a single-phase AC power supply output by an inverter controller and provides a welding current after stepping down through a transformer, solving the single-phase power supply problem of the AC press welder and avoiding the power grid imbalance phenomenon. Since the main welding circuit adopts the inverter working mode, the power factor of the equipment is effectively improved. The welding process of the steel grating is closed-loop controlled by the microcomputer. Under the condition of unstable voltage or changing welding load, the welding current is automatically adjusted to ensure the stability of the welding current, thereby improving the welding quality of the steel grating. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is a schematic flow chart of the welding current control system for the steel grating press welder disclosed in the embodiment of the present application to realize the automatic adjustment of the welding current;

[0037] Figure 2 It is a schematic structural diagram of the welding power supply module in an embodiment;

[0038] Figure 3 It is a schematic structural diagram of the welding current control device for the steel grating press welder. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0040] It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present application and the accompanying drawings are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include unlisted steps or units, or may optionally further include other steps or units inherent to these processes, methods, products, or devices.

[0041] It can be understood that the terms "first", "second", etc. used in the present application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of the present application, the first trigger pulse can be referred to as the second trigger pulse, and similarly, the second trigger pulse can be referred to as the first trigger pulse. Both the first trigger pulse and the second trigger pulse are trigger pulses, but they are not the same trigger pulse.

[0042] The embodiments of the present application disclose a welding current control system for a steel grating press welder, which realizes automatic adjustment of the welding current, ensures the stability of the welding current, and thus improves the welding quality of the steel grating. The following will be described in detail respectively.

[0043] Steel grating is a kind of metal sheet with excellent performance, which is widely used in fields such as building structures, industrial equipment, municipal engineering, and transportation. In the manufacturing process, the production technology and equipment of steel grating play a crucial role in its quality and cost. In the production process of steel grating, welding technology is used for consolidation, which is generally divided into cold drawing welding and electric welding. Cold drawing welding refers to the method of welding at room temperature, with a slower forming speed but excellent finished product quality. Electric welding refers to welding by heating with current at an appropriate temperature, with a faster forming speed, but precise control of the current is required to ensure product quality. With the continuous development of robot technology, the application of welding robots in the production of steel grating is becoming more and more popular. Compared with traditional manual welding, robot welding is more accurate and stable, and can also greatly shorten the production cycle. The use of automatic forming molds can improve production efficiency and consistency, ensure the accurate size and better surface quality of the steel grating. The innovation of the production technology and equipment of steel grating can effectively improve the quality and production efficiency of steel grating, and provide higher quality, efficient, and safe products for various industries.

[0044] Please refer to Figure 1 , Figure 1 which is a schematic flow chart of the welding current control system for a steel grating press welder disclosed in the embodiments of the present application to realize automatic adjustment of the welding current. As Figure 1 shown, the steps for the welding current control system for a steel grating press welder to realize automatic adjustment of the welding current may include the following steps:

[0045] Step S101, provide a stable DC welding current.

[0046] In some embodiments, three-phase or single-phase industrial frequency alternating current is rectified, and after filtering, a relatively smooth direct current is obtained. An inverter circuit composed of IGBTs converts this direct current into an alternating current of dozens of kHz. After being stepped down by a transformer, it is rectified and filtered again to obtain a stable DC output welding current, which is used to provide a stable DC power supply for the entire STM32 system, ensuring the stable operation of the welding current control system of the steel grating press welder.

[0047] As an alternative implementation, due to the very high inverter operating frequency, the cross-sectional area of the transformer core and the number of turns of the coil are greatly reduced. Therefore, the inverter steel grating press welder can save a large amount of metal materials to a great extent, reduce the external dimensions and weight, and greatly reduce the power loss. More importantly, the inverter steel grating press welder can adjust the output current within microseconds, so it can achieve the ideal control process required by the welding process and obtain a satisfactory welding effect.

[0048] Step S102, obtain the position parameter information of the press welder, and generate a feedback signal according to the position parameter information.

[0049] In some embodiments, the step of obtaining the position parameter information of the press welder and generating a feedback signal according to the position parameter information further includes: collecting the position parameter information of the press welder through a position sensor; wherein, the position sensor is placed on the motor of the press welder; generating a feedback signal according to the position parameter information.

[0050] As an alternative implementation, in order to achieve closed-loop control, the STM32 system needs to obtain the accurate position parameter information of the steel grating press welder in real time, which is usually achieved through a position sensor. For example, the position sensor includes an encoder or a Hall sensor.

[0051] Step S103, read the feedback signal based on the STM32 platform, input the feedback signal into a closed-loop control algorithm and output a control signal.

[0052] In some embodiments, the step of reading the feedback signal based on the STM32 platform, inputting the feedback signal into a closed-loop control algorithm and outputting a control signal further includes: reading the feedback signal based on the STM32 platform and monitoring the feedback signal in real time; inputting the feedback signal into a closed-loop control algorithm; wherein, the closed-loop control algorithm includes a PID control algorithm and other advanced closed-loop control algorithms; adjusting in real time according to the feedback signal and the closed-loop control algorithm through mechanisms such as timers and interrupts, and outputting a control signal based on the STM32 platform.

[0053] As an alternative implementation, the PID controller calculates through the proportional, integral, and derivative links based on the error between the set value and the actual value, and outputs a control quantity to adjust the output control signal. Among them, the proportion responds to the error proportionally, the larger the error, the larger the control quantity; the integral is used to eliminate the steady-state error of the system and accumulate the error through integration; the derivative predicts the change trend of the error in advance according to the change rate of the error to improve the dynamic response of the system.

[0054] As an alternative implementation, the STM32 microcontroller serves as the core of the welding current control system for the steel grating press welder. The STM32 microcontroller is responsible for generating control signals, processing feedback signals, and implementing the closed-loop control algorithm. Its high performance, low power consumption, and rich peripheral interfaces make it very suitable for controlling the welding current of the steel grating press welder. The closed-loop control algorithm is the key to realizing the control of the welding current of the steel grating press welder. According to the requirements of the system, a PID control algorithm or other advanced closed-loop control algorithms can be adopted. These algorithms are implemented in the software of the STM32 and communicate with the stepping motor drive module in real time through mechanisms such as timers and interrupts. The STM32 can read the feedback signal of the position sensor and adjust the output pulse signal in real time according to the set target position and the control algorithm, thereby realizing the control of the welding current of the steel grating press welder.

[0055] Step S104: Convert the control signal into a current signal for driving the press welder to achieve automatic adjustment of the welding current.

[0056] In some embodiments, the control signal output by the STM32 is converted into a current signal suitable for driving the steel grating press welder. Generally, the motor drive module also has functions such as current control, protection, and subdivision to ensure the normal operation and working efficiency of the steel grating press welder, realize automatic adjustment of the welding current, ensure the stability of the welding current, and thus improve the quality of steel grating welding.

[0057] In the embodiment of the present application, a welding current control system for a steel grating press welder includes a welding power supply module, a position detection module, a microcomputer control module, and a motor drive module. Among them, the welding power supply module is used to provide a stable DC welding current; the position detection module is used to obtain the position parameter information of the press welder and generate a feedback signal according to the position parameter information; the microcomputer control module is used to read the feedback signal based on the STM32 platform, input the feedback signal into a closed-loop control algorithm and output a control signal; the motor drive module is used to convert the control signal into a current signal for driving the press welder to realize the automatic adjustment of the welding current. Implementing the embodiment of the present application, the welding power supply uses a three-phase AC power supply input, which is inverted into a single-phase AC power supply output by an inverter controller and provides a welding current after being stepped down by a transformer, solving the single-phase power supply problem of the AC press welder and avoiding the grid imbalance phenomenon. Since the main welding circuit adopts the inverter working mode, the power factor of the equipment is effectively improved. The welding process of the steel grating is closed-loop controlled by a microcomputer. In the case of unstable voltage or changing welding load, the welding current is automatically adjusted to ensure the stability of the welding current, thereby improving the welding quality of the steel grating.

[0058] The welding power supply is the core part of the steel grating press welder, and cooperates with the feeding mechanism, hydraulic mechanism, and discharging mechanism controlled by PLC to realize the automatic welding of the steel grating. The existing welding power supply of the steel grating press welder adjusts the welding current by changing the trigger phase of the thyristor, and the secondary uses diode rectification. It is difficult to improve the power factor, and it is necessary to increase a capacitor compensation cabinet to improve the power factor, thus increasing the cost. At the same time, the diode rectification wastes a large amount of energy, resulting in reduced efficiency.

[0059] Figure 2 It is a schematic structural diagram of the welding power supply module in an embodiment. As Figure 2 shown, the welding power supply module may include a rectification circuit sub-module, a filter capacitor sub-module, an inverter circuit sub-module, and a transformer sub-module. The rectification circuit sub-module is used to rectify the three-phase alternating current; the filter capacitor sub-module is used to filter the rectified three-phase alternating current to obtain a relatively smooth direct current; the inverter circuit sub-module is used to invert the direct current into a single-phase alternating current through an inverter circuit composed of IGBTs; the transformer sub-module is used to step down the single-phase alternating current and rectify and filter it again to output a stable DC welding current.

[0060] The rectifier circuit sub-module includes three thyristor units, and each thyristor unit includes two series-connected thyristors. Among them, the three common poles of the thyristors are the input terminals of the rectifier circuit sub-module; the three cathodes of the thyristors are connected in parallel and then connected to the positive pole of the filter capacitor sub-module; the three anodes of the thyristors are connected in parallel and then connected to the negative pole of the filter capacitor sub-module; the positive pole of the filter capacitor sub-module is also connected to the C pole of the upper-bridge-arm IGBT of the inverter circuit sub-module; the negative pole of the filter capacitor sub-module is also connected to the E pole of the lower-bridge-arm IGBT of the inverter circuit sub-module.

[0061] The welding power supply module may further include a pre-start circuit sub-module and a drive circuit sub-module. Among them, the pre-start circuit sub-module is used to output a first trigger pulse to trigger the thyristor and control the conduction of the thyristor; the drive circuit sub-module is used to output a second trigger pulse to trigger the IGBT. The drive circuit sub-module may include a first judgment unit and a second judgment unit. Among them, the first judgment unit is used to make the IGBT conduct when the second trigger pulse is at a positive level; the second judgment unit is used to turn off the IGBT when the second trigger pulse is at a negative level.

[0062] The inverter circuit sub-module may include 4 IGBTs. Among them, the 4 IGBTs are connected in parallel in pairs to form the upper bridge arm and the lower bridge arm of the inverter circuit sub-module respectively. The filter capacitor sub-module may include two series-connected capacitors, and each capacitor is connected in parallel with a voltage-sharing resistor. So that the series-connected capacitors share the same voltage and prevent the voltage charged on the capacitor from exceeding the withstand voltage of the capacitor. The IGBTs of the inverter circuit sub-module and the thyristor units of the rectifier circuit sub-module are installed on a radiator and cooled by a fan.

[0063] In some embodiments, IGBT is the abbreviation of Insulated Gate Bipolar Transistor, which is a three-terminal semiconductor switching device and can be used for efficient and fast switching in various electronic devices. In practical applications, the most popular and common electronic components are Bipolar Junction Transistor (BJT) and MOS transistor. IGBT can be regarded as a fusion of BJT and MOS transistor. IGBT has the input characteristics of MOS and the output characteristics of BJT. Compared with BJT or MOS transistor, the advantage of Insulated Gate Bipolar Transistor (IGBT) is that it provides a greater power gain than the standard bipolar transistor, as well as a higher operating voltage and lower MOS transistor input loss. The input side represents the MOS transistor with a gate terminal, and the output side represents the BJT with a collector and an emitter. The collector and the emitter are conducting terminals, and the gate is the control terminal for controlling the switching operation.

[0064] In some embodiments, when the steel grating press welder is working, the flat steel conveyed by the flat steel supporting roller table is fed into the pneumatic comb-shaped clamping device or the hydraulic comb-shaped clamping device on the lower layer platform of the main machine. At this time, the lifting flat steel end positioning and alignment device at the end of the platform rises to block, align and position the flat steel ends. Then the comb-shaped clamping device clamps the flat steel. At this time, the cross rib feeding ejector has smoothly fed the cross ribs into the main machine through the chute and placed them on the flat steel. The cross ribs are positioned on the flat steel through the cross rib positioning device. At this time, the hydraulic platform drives the upper electrode to press down. After the flat steel and the cross ribs are pressed tightly, power is supplied to press the two cross ribs into the flat steel to complete the first welding. The lifting flat steel end positioning and alignment device at the end of the platform descends, and the comb-shaped clamping and feeding device feeds the flat steel forward by one step distance for the second welding. In this way, the welding of the steel grating products is carried out in a cycle. The welding process is closed-loop controlled by a microcomputer. In the case of unstable voltage or changing welding load, the welding current can be automatically adjusted to ensure the stability of the welding current, thereby improving the welding quality.

[0065] In some embodiments, three-phase or single-phase industrial frequency alternating current is rectified, and after filtering, a relatively smooth direct current is obtained. The inverter circuit composed of IGBTs converts this direct current into alternating current of dozens of kHz. After being stepped down by a transformer, it is rectified and filtered again to obtain a stable DC output welding current, which is used to provide a stable DC power supply for the entire STM32 system, ensuring the stable operation of the welding current control system of the steel grating press welder. Since the inverter operating frequency is very high, the cross-sectional area of the transformer core and the number of turns of the coil are greatly reduced. Therefore, the inverter steel grating press welder can save a large amount of metal materials, reduce the external dimensions and weight to a great extent, and greatly reduce the power consumption. More importantly, the inverter steel grating press welder can adjust the output current within microseconds, so it can achieve the ideal control process required by the welding process and obtain satisfactory welding results. The welding power supply uses three-phase AC power input, is inverted by the inverter controller into single-phase AC power output, and provides welding current after being stepped down by a transformer, solving the problem of single-phase power supply of the AC press welder and avoiding the phenomenon of grid imbalance. Since the main welding circuit adopts the inverter working mode, the power factor of the equipment is effectively improved.

[0066] Figure 3 It is a structural schematic diagram of the welding current control device of the steel grating press welder. As Figure 3 shown, the welding current control device 300 of the steel grating press welder includes a welding power supply module 301, a position detection module 302, a microcomputer control module 303, and a motor drive module 304.

[0067] The welding power supply module 301 is used to provide a stable DC welding current;

[0068] The position detection module 302 is used to obtain the position parameter information of the press welder and generate a feedback signal according to the position parameter information;

[0069] The microcomputer control module 303 is used to read the feedback signal based on the STM32 platform, input the feedback signal into the closed-loop control algorithm and output a control signal;

[0070] The motor drive module 304 is used to convert the control signal into a current signal for driving the welding machine, so as to realize the automatic adjustment of the welding current.

[0071] In this embodiment, a computer program capable of executing steps S101 - S104 can be written and written into a computer device or a storage medium. When the computer device or the storage medium runs, it can execute steps S101 - S104 to realize the automatic execution of the welding current control system of the steel grating press welder and obtain the technical effects of the welding current control system of the steel grating press welder. Optionally, each component in the welding current control system of the steel grating press welder can also be used as a data processing module in the computer program, capable of executing steps S101 - S104, so that the computer device can control the welding current of the steel grating press welder.

[0072] It should be noted that, unless otherwise specified, when a certain feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. In addition, the up, down, left, right, etc. descriptions used in this disclosure are only relative to the mutual positional relationship of the components of this disclosure in the drawings. The singular forms of "a", "the" and "said" used in this disclosure are also intended to include the plural forms, unless the context clearly indicates otherwise. In addition, unless otherwise defined, all the technical and scientific terms used in this embodiment have the same meanings as those commonly understood by those skilled in the technical field of this application. The terms used in the description of this embodiment are only for describing specific embodiments, rather than for limiting the present invention. The term "and / or" used in this embodiment includes any combination of one or more of the related listed items.

[0073] It should be recognized that embodiments of the present invention can be implemented or carried out by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable memory. The methods can be implemented in a computer program using standard programming techniques - including a non-transitory computer-readable storage medium configured with the computer program, wherein the storage medium so configured causes the computer to operate in a specific and predefined manner - in accordance with the methods and drawings described in the specific embodiments. Each program can be implemented in a high-level procedural or object-oriented programming language to communicate with the computer system. However, if desired, the program can be implemented in assembly or machine language. In any case, the language can be a compiled or interpreted language. In addition, for this purpose the program is capable of running on a programmed application-specific integrated circuit.

[0074] In addition, the operations of the processes described in this embodiment can be performed in any suitable order, unless this embodiment otherwise indicates or is otherwise clearly contradicted by the context. The processes described in this embodiment (or variations and / or combinations thereof) can be executed under the control of one or more computer systems configured with executable instructions, and can be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) executed jointly on one or more processors, by hardware, or a combination thereof. The computer program includes a plurality of instructions executable by one or more processors.

[0075] Further, the method can be implemented in any type of computing platform operably connected, including but not limited to personal computers, minicomputers, mainframes, workstations, network or distributed computing environments, separate or integrated computer platforms, or communicating with charged particle tools or other imaging devices, etc. Aspects of the present invention can be implemented in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into the computing platform, such as a hard disk, optical read and / or write storage medium, RAM, ROM, etc., such that it can be read by a programmable computer and, when the storage medium or device is read by the computer, can be used to configure and operate the computer to execute the processes described herein. In addition, the machine-readable code, or portions thereof, can be transmitted via a wired or wireless network. When such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor, the inventions described in this embodiment include these and other different types of non-transitory computer-readable storage media. When programmed according to the methods and techniques of the present invention, the present invention also includes the computer itself.

[0076] A computer program can be applied to input data to perform the functions described in this embodiment, thereby converting the input data to generate output data stored in a non-volatile memory. The output information can also be applied to one or more output devices such as a display. In a preferred embodiment of the present invention, the converted data represents physical and tangible objects, including a specific visual depiction of the physical and tangible objects generated on the display.

[0077] As described above, it is only a preferred embodiment of the present invention. The present invention is not limited to the above-described embodiments. As long as it achieves the technical effects of the present invention by the same means, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention. Within the scope of protection of the present invention, its technical solutions and / or implementation manners can have various different modifications and changes.

Claims

1. Steel grid plate pressure welding machine welding current control system, characterized in that: It includes a welding power supply module, a position detection module, a microcomputer control module and a motor drive module; wherein, The welding power supply module is used to provide a stable DC welding current; The position detection module is used to obtain the position parameter information of the pressure welding machine and generate a feedback signal according to the position parameter information; The microcomputer control module is used to read the feedback signal based on the STM32 platform, input the feedback signal into a closed-loop control algorithm and output a control signal; The motor drive module is used to convert the control signal into a current signal for driving the pressure welding machine to achieve automatic adjustment of the welding current.

2. The welding current control system of the steel grating plate pressure welding machine according to claim 1 is characterized in that: The welding power supply module includes a rectifier circuit submodule, a filter capacitor submodule, an inverter circuit submodule and a transformer submodule: The rectifier circuit submodule is used to rectify three-phase alternating current; The filter capacitor submodule is used to filter the rectified three-phase alternating current to obtain a smoother direct current; The inverter circuit submodule is used to invert the direct current into single-phase alternating current through an inverter circuit composed of IGBTs; The transformer module is used to reduce the voltage of the single-phase AC power and rectify and filter it again to output a stable DC welding current.

3. The welding current control system of the steel grating plate pressure welding machine according to claim 2 is characterized in that: The rectifier circuit submodule includes three thyristor units, each of which includes two thyristors connected in series; Among them, the three common poles of the thyristor are the input ends of the rectifier circuit submodule; the three cathodes of the thyristor are connected in parallel and then connected to the positive pole of the filter capacitor submodule; the three anodes of the thyristor are connected in parallel and then connected to the negative pole of the filter capacitor submodule; the positive pole of the filter capacitor submodule is connected to the C pole of the upper bridge arm IGBT of the inverter circuit submodule; the negative pole of the filter capacitor submodule is connected to the E pole of the lower bridge arm IGBT of the inverter circuit submodule.

4. The welding current control system of the steel grating plate pressure welding machine according to claim 2 is characterized in that: The fusion power supply module also includes a pre-start circuit submodule and a drive circuit submodule: The pre-start circuit submodule is used to output a first trigger pulse to trigger the thyristor and control the conduction of the thyristor; The driving circuit submodule is used to output a second trigger pulse to trigger the IGBT.

5. The welding current control system of the steel grating plate pressure welding machine according to claim 4 is characterized in that: The driving circuit submodule includes a first judgment unit and a second judgment unit: The first judgment unit is used to turn on the IGBT if the second trigger pulse is at a positive level; The second judgment unit is used to turn off the IGBT if the second trigger pulse is at a negative level.

6. The welding current control system of the steel grating plate pressure welding machine according to claim 2 is characterized in that: The inverter circuit submodule includes 4 IGBTs; The four IGBTs are connected in parallel in pairs to respectively form the upper bridge arm and the lower bridge arm of the inverter circuit submodule.

7. The welding current control system of the steel grating plate pressure welding machine according to claim 2 is characterized in that: The filter capacitor submodule includes two capacitors connected in series, and each of the capacitors is connected in parallel with a voltage-equalizing resistor.

8. The welding current control system of the steel grating plate pressure welding machine according to claim 2 is characterized in that: The IGBT of the inverter circuit submodule and the thyristor unit of the rectifier circuit submodule are mounted on a heat sink and are cooled by a fan.

9. The welding current control system of the steel grating plate pressure welding machine according to claim 1 is characterized in that: The position detection module includes a position acquisition submodule and a signal feedback submodule; The position acquisition submodule is used to acquire the position parameter information of the pressure welding machine through a position sensor; the position sensor is placed on the motor of the pressure welding machine; The signal feedback submodule is used to generate the feedback signal according to the position parameter information.

10. The welding current control system of the steel grating plate pressure welding machine according to claim 1, characterized in that: The microcomputer control module includes a reading submodule, a control algorithm submodule and a signal output submodule; The reading submodule is used to read the feedback signal based on the STM32 platform and monitor the feedback signal in real time; The control algorithm submodule is used to input the feedback signal into the closed-loop control algorithm; the closed-loop control algorithm includes a PID control algorithm and other advanced closed-loop control algorithms; The signal output submodule is used to adjust in real time according to the feedback signal and the closed-loop control algorithm through mechanisms such as timers and interrupts, and output the control signal based on the STM32 platform.

Images