Plasma cutting machine guiding arc current control method and device and plasma cutting machine

Abstract

The embodiment of the application discloses a kind of plasma cutting machine guiding arc current control method, device and plasma cutting machine.The method comprises: when detecting that gun switch is pressed, according to the initial value of current guiding arc current control is ignited, and guiding arc current is detected;When detecting guiding arc current, start the first timer and the second timer timing, and start detecting cutting arc current;If arc ignition is successful, control the first timer stops timing, and based on the first timing result of first timer, the initial value of target guiding arc current used when next gun switch is pressed is determined according to the initial value of current guiding arc current;If abnormal arc is broken, control the second timer stops timing, and based on the second timing result of second timer, the initial value of target guiding arc current used when next gun switch is pressed is determined according to the initial value of current guiding arc current.Real-time matching appropriate guiding arc current can be realized according to user actual application scene.

Description

Technical Field

[0001] This invention relates to the field of plasma cutting machine technology, and in particular to a method, device and plasma cutting machine for controlling the pilot arc current of a plasma cutting machine. Background Technology

[0002] Plasma technology has been widely applied in industries such as industry, chemistry, defense, and communications. Plasma cutting is a high-speed, high-precision method for cutting metal materials. Compared with traditional flame cutting, plasma cutting has become increasingly popular in the metal cutting field due to its advantages such as rapid cutting speed and good cutting quality. Air plasma cutting machines generally have two arc-starting methods: contact arc-starting and non-contact arc-starting. Contact arc-starting involves the cutting torch nozzle contacting the workpiece (positive output electrode), and then igniting the arc through high-frequency discharge between the cutting torch electrode (negative output electrode) and the nozzle. Non-contact arc-starting involves the cutting torch nozzle not contacting the workpiece during arc-starting. First, the positive output electrode is connected to the cutting torch nozzle via a control switch. Then, an arc is established and maintained between the electrode and nozzle through high-frequency or contact methods. Compressed air then compresses the arc and ejects it from the nozzle, forming a pilot arc. Finally, the pilot arc contacts the workpiece. When current is detected flowing from the electrode through the workpiece, the pilot arc control is turned off (i.e., the connection between the positive electrode and the nozzle is disconnected), allowing all the current to flow through the electrode through the workpiece, thus igniting the main arc.

[0003] Because contact arc initiation methods are prone to nozzle burnout during the initial arc, especially with higher cutting currents, models with an output current greater than 40A generally employ non-contact arc initiation. Non-contact arc initiation requires establishing a pilot arc between the electrode and the nozzle. This pilot arc current is lower than the normal cutting current. Currently, there are two methods to control the pilot arc current: one uses a power resistor for current limiting, and the other uses constant current control. Both methods use a fixed, initially set pilot arc current. To ensure successful arc initiation under various user conditions, the pilot arc current is often set to the upper limit of the selectable current. While a larger pilot arc current ensures a higher success rate, it also increases the wear and tear on the electrode and nozzle. Summary of the Invention

[0004] This invention provides a method, device, and plasma cutting machine for controlling the pilot arc current of a plasma cutting machine, in order to solve the problems that in some scenarios the fixed pilot arc current is too low, resulting in discontinuous pilot arc and difficulty in arc initiation, while in other scenarios the current is too high, leading to heavy wear and tear on the easily damaged parts of the cutting torch.

[0005] In a first aspect, embodiments of the present invention provide a method for controlling the guiding arc current of a plasma cutting machine, the method comprising:

[0006] When the gun switch is detected to be pressed, the arc is initiated according to the current initial value of the pilot arc current, and the pilot arc current is detected.

[0007] When the pilot arc current is detected, the first timer and the second timer are started to begin timing, and the cutting arc current is detected.

[0008] If the arc initiation is successfully determined based on the detected cutting arc current, the first timer is controlled to stop timing, and the target initial value of the pilot arc current to be used when the gun switch is pressed next is determined based on the first timing result of the first timer and the current initial value of the pilot arc current.

[0009] If an abnormal arc break is determined based on the detected cutting arc current and pilot arc current, the second timer is controlled to stop timing, and the target pilot arc current initial value used when the gun switch is pressed next is determined based on the second timing result of the second timer and the current pilot arc current initial value.

[0010] Optionally, after the start of detecting the cutting arc current, the method further includes:

[0011] If the detected cutting arc current is greater than the first current threshold, the arc initiation is considered successful.

[0012] If the detected cutting arc current is less than the first current threshold and the detected guiding arc current is less than the second current threshold, then an abnormal arc break is determined.

[0013] Optionally, determining the initial value of the target pilot arc current used when the gun switch is pressed next time, based on the first timing result of the first timer and the current initial value of the pilot arc current, includes:

[0014] If the first timing result is less than the first time threshold, then the initial value of the target pilot arc current is the difference between the current initial value of the pilot arc current and the first current value; otherwise, the initial value of the target pilot arc current is the difference between the current initial value of the pilot arc current and the second current value.

[0015] Optionally, the step of determining the initial value of the target pilot arc current used when the gun switch is pressed next time, based on the second timing result of the second timer and the current initial value of the pilot arc current, includes:

[0016] If the second timing result is less than the second time threshold, the initial value of the target pilot arc current is the sum of the current initial value of the pilot arc current and the third current value; otherwise, the initial value of the target pilot arc current is the sum of the current initial value of the pilot arc current and the fourth current value.

[0017] Optionally, after determining the initial value of the target pilot arc current used when the gun switch is pressed next time based on the first timing result of the first timer according to the current initial value of the pilot arc current, or after determining the initial value of the target pilot arc current used when the gun switch is pressed next time based on the second timing result of the second timer according to the current initial value of the pilot arc current, the method further includes:

[0018] The initial value of the target pilot arc current is adjusted according to the preset lower limit value and the preset upper limit value of the pilot arc current.

[0019] Optionally, controlling arc initiation based on the current initial value of the pilot arc current includes:

[0020] The initial value of the current guiding arc current is increased at a preset rate.

[0021] Optionally, if this is the first time the gun switch has been pressed, the initial value of the current pilot arc current is a preset initial value.

[0022] The step of controlling arc initiation based on the current initial value of the pilot arc current includes:

[0023] Arc initiation is controlled using the fixed preset initial value.

[0024] Secondly, embodiments of the present invention also provide a plasma cutting machine guiding arc current control device, the device comprising:

[0025] The pilot arc current detection module is used to control arc initiation based on the current initial value of the pilot arc current when the gun switch is detected to be pressed, and to start detecting the pilot arc current.

[0026] The arc current detection module is used to start the first timer and the second timer respectively when the pilot arc current is detected, and to start detecting the arc current.

[0027] The first target arc current initial value determination module is used to control the first timer to stop timing if the arc initiation is successful based on the detected cutting arc current, and to determine the target arc current initial value to be used when the gun switch is pressed next time based on the first timing result of the first timer and the current arc current initial value.

[0028] The second target arc current initial value determination module is used to control the second timer to stop timing if an abnormal arc break is determined based on the detected cutting arc current and arc current, and to determine the target arc current initial value to be used when the gun switch is pressed next time based on the second timing result of the second timer and the current arc current initial value.

[0029] Thirdly, embodiments of the present invention also provide a plasma cutting machine, the plasma cutting machine comprising:

[0030] One or more processors;

[0031] Memory, used to store one or more programs;

[0032] When the one or more programs are executed by the one or more processors, the one or more processors implement the plasma cutting machine pilot arc current control method provided in any embodiment of the present invention.

[0033] Fourthly, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the plasma cutting machine pilot arc current control method provided in any embodiment of the present invention.

[0034] This invention provides a method for controlling the pilot arc current of a plasma cutting machine. Whenever the gun switch is detected to be pressed, arc ignition is controlled based on the current initial value of the pilot arc current, and the pilot arc current is simultaneously detected. Then, when the pilot arc current is detected, a first timer and a second timer are started, and the cutting arc current is simultaneously detected. If the arc ignition is deemed successful based on the detected cutting arc current, the first timer is stopped, and the initial value of the target pilot arc current for the next time the gun switch is pressed is determined based on the first timing result of the first timer and the current initial value of the pilot arc current. If an abnormal arc break is determined based on the detected cutting arc current and the pilot arc current, the second timer is stopped, and the initial value of the target pilot arc current for the next time the gun switch is pressed is determined based on the second timing result of the second timer and the current initial value of the pilot arc current. The plasma cutting machine pilot arc current control method provided in this invention calculates the initial value of the pilot arc current to be used each time the gun switch is pressed in real time through software. It can match the appropriate pilot arc current in real time according to the user's actual application scenario, which solves the problem that the fixed pilot arc current is too small in some scenarios, resulting in discontinuous pilot arc and poor arc initiation, while the current is too large in other scenarios, resulting in heavy wear and tear on the cutting gun's vulnerable parts. Attached Figure Description

[0035] Figure 1 This is a flowchart of the plasma cutting machine guide arc current control method provided in Embodiment 1 of the present invention;

[0036] Figure 2 This is a schematic diagram of the structure of the plasma cutting machine guide arc current control device provided in Embodiment 2 of the present invention;

[0037] Figure 3 This is a schematic diagram of the plasma cutting machine provided in Embodiment 3 of the present invention. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0039] Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the steps as sequential processes, many of the steps may be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the steps may be rearranged. The process may be terminated when its operation is complete, but may also have additional steps not included in the figures. The process may correspond to a method, function, procedure, subroutine, subroutine, etc.

[0040] Furthermore, the terms "first," "second," etc., may be used herein to describe various directions, actions, steps, or elements, but these directions, actions, steps, or elements are not limited by these terms. These terms are only used to distinguish a first direction, action, step, or element from another direction, action, step, or element. For example, without departing from the scope of the embodiments of the present invention, a first timer may be referred to as a second timer, and similarly, a second timer may be referred to as a first timer. Both the first timer and the second timer are timers, but they are not the same timer. The terms "first," "second," etc., should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] Example 1

[0042] Figure 1 This is a flowchart of the plasma cutting machine initiation arc current control method provided in Embodiment 1 of the present invention. This embodiment is applicable to controlling the plasma cutting machine to initiate an arc. This method can be executed by the plasma cutting machine initiation arc current control device provided in this embodiment of the present invention. This device can be implemented by hardware and / or software, and is generally integrated into the plasma cutting machine, specifically implemented by a microcontroller in the plasma cutting machine. Figure 1 As shown, the specific steps include the following:

[0043] S11. When the gun switch is detected to be pressed, the arc is started according to the current initial value of the pilot arc current, and the pilot arc current is detected.

[0044] Specifically, this method can be implemented without increasing hardware costs in the existing control circuit. The electrode of the cutting gun is connected to the negative output of the plasma cutter, and the nozzle of the cutting gun is connected to the positive output of the plasma cutter through a guiding arc circuit.

[0045] Each time the gun switch is detected to be pressed, the currently stored initial value of the arc-initiating current can be used to control arc ignition, and the actual generated arc-initiating current can be detected. Optionally, controlling arc ignition based on the current initial value of the arc-initiating current includes: incrementing the current initial value of the arc-initiating current at a preset rate. That is, after starting to control arc ignition, an initial value plus a slope incrementing method can be used to control arc ignition using an arc-initiating current setpoint obtained by continuously incrementing the current initial value of the arc-initiating current. This can further reduce the wear and tear on vulnerable parts caused by the arc, and also improve the success rate of arc ignition. Furthermore, the preset speed for increasing the arc current can be determined based on the magnitude of the initial value of the current initiating arc current. Specifically, the initial value of the current initiating arc current can be compared with the preset lower limit and the preset upper limit of the current initiating arc current. If the initial value of the current initiating arc current is less than half of the sum of the preset lower limit and the preset upper limit, the arc current setpoint can be the initial value of the current initiating arc current plus a first preset speed (e.g., 1A / 0.1s). If the initial value of the current initiating arc current is greater than or equal to half of the sum of the preset lower limit and the preset upper limit, the arc current setpoint can be the initial value of the current initiating arc current plus a second preset speed (e.g., 0.5A / 0.1s). That is, when the initial value of the current initiating arc current is small, a larger preset speed can be used for increasing the speed, while when the initial value of the current initiating arc current is large, a smaller preset speed can be used for increasing the speed, thereby better protecting vulnerable components and ensuring the success rate of arc initiation.

[0046] Optionally, if this is the first time the gun switch is detected to be pressed, the initial value of the current pilot arc current is a preset initial value. Controlling arc ignition based on the current initial value of the pilot arc current includes: using a fixed preset initial value to control arc ignition, that is, when the gun switch is detected to be pressed for the first time, a fixed preset initial value can be used as the pilot arc current setpoint to control arc ignition. Additionally, after the plasma cutting machine completes its power-on self-test, when the gun switch is detected to be pressed for the first time, the microcontroller simultaneously activates the high-frequency control, pilot arc control, and gas valve control. After a delayed gas supply time, the microcontroller activates the IGBT drive control to begin controlling arc ignition, and simultaneously begins detecting the actual generated pilot arc current.

[0047] S12. When the pilot arc current is detected, the first timer and the second timer are started to start timing and the cutting arc current is detected.

[0048] Specifically, when the pilot arc current is detected, the pilot arc can be considered to have been established successfully. At this point, two timers can be started simultaneously to begin timing and detecting the cutting arc current. The first timer can be used to record the time from the establishment of the pilot arc to successful arc initiation, while the second timer can be used to record the time from the establishment of the pilot arc to abnormal arc termination. This allows for adjustment of the initial value of the pilot arc current used in the next operation based on the recorded time.

[0049] Optionally, after starting to detect the cutting arc current, the method further includes: if the detected cutting arc current is greater than a first current threshold, then the arc ignition is determined to be successful; if the detected cutting arc current is less than the first current threshold, and the detected guiding arc current is less than a second current threshold, then an abnormal arc breakage is determined. Preferably, the first current threshold is 7A and the second current threshold is 3A. When the detected cutting arc current is greater than the first current threshold, the arc ignition can be determined to be successful, and the cutting operation can be performed. When the detected cutting arc current is less than or equal to the first current threshold, it can be determined that the guiding arc has not yet transferred to the cutting arc or the transfer has failed. In this case, the detected guiding arc current can be referenced. If the guiding arc current is less than the second current threshold, an abnormal arc breakage can be determined; otherwise, the detection can continue.

[0050] S13. If the arc initiation is successful based on the detected cutting arc current, the first timer is controlled to stop timing, and the initial value of the target arc current to be used when the gun switch is pressed next is determined based on the first timing result of the first timer and the initial value of the current arc current.

[0051] Specifically, if the arc initiation is determined to be successful, the first timer can be stopped to obtain the first timing result. Then, the initial value of the current pilot arc current can be adjusted according to the first timing result to obtain the initial value of the target pilot arc current used when the gun switch is pressed next time.

[0052] Optionally, determining the initial value of the target arc-guiding current used when the gun switch is pressed next, based on the first timing result of the first timer and the initial value of the current arc-guiding current, includes: if the first timing result is less than a first time threshold, then the initial value of the target arc-guiding current is the difference between the initial value of the current arc-guiding current and a first current value; otherwise, the initial value of the target arc-guiding current is the difference between the initial value of the current arc-guiding current and a second current value. The first current value can be greater than the second current value. Preferably, the first time threshold is 0.2s, the first current value is 2A, and the second current value is 1A. That is, when the time required for successful arc ignition is short, the initial value of the target arc-guiding current used next can be reduced more significantly; conversely, when the time required for successful arc ignition is long, the initial value of the target arc-guiding current used next can be reduced less significantly, thereby better protecting vulnerable components and ensuring a high success rate for arc ignition.

[0053] S14. If an abnormal arc break is determined based on the detected cutting arc current and the pilot arc current, the second timer is controlled to stop timing, and the target pilot arc current initial value used when the gun switch is pressed next is determined based on the second timing result of the second timer and the current pilot arc current initial value.

[0054] Specifically, if an abnormal arc interruption is detected, the second timer can be stopped to obtain the second timing result. Then, the initial value of the current pilot arc current can be adjusted according to the second timing result to obtain the initial value of the target pilot arc current used when the gun switch is pressed next time.

[0055] Optionally, determining the initial value of the target arc-guiding current used when the gun switch is pressed next, based on the second timing result of the second timer and the current initial value of the arc-guiding current, includes: if the second timing result is less than a second time threshold, the initial value of the target arc-guiding current is the sum of the current initial value of the arc-guiding current and a third current value; otherwise, the initial value of the target arc-guiding current is the sum of the current initial value of the arc-guiding current and a fourth current value. The third current value can be greater than the fourth current value. Preferably, the second time threshold is 1 second, the third current value is 2A, and the fourth current value is 1A. That is, when the duration of the abnormal arc interruption is short, the initial value of the target arc-guiding current used next can be increased more significantly, while when the duration of the abnormal arc interruption is long, the initial value of the target arc-guiding current used next can be increased less significantly, thereby improving the arc-starting success rate and protecting vulnerable components.

[0056] Based on the above technical solution, optionally, after determining the initial value of the target pilot arc current used when the gun switch is pressed next time based on the first timing result of the first timer according to the current initial value of the pilot arc current, or after determining the initial value of the target pilot arc current used when the gun switch is pressed next time based on the second timing result of the second timer according to the current initial value of the pilot arc current, the method further includes: adjusting the initial value of the target pilot arc current according to a preset lower limit value of the pilot arc current and a preset upper limit value of the pilot arc current.

[0057] Specifically, after calculating the initial value of the target arc-guiding current to be used when the gun switch is pressed next, the initial value of the target arc-guiding current can be adjusted according to the preset lower limit and upper limit of the arc-guiding current to avoid the calculated value exceeding a reasonable range, thereby better protecting vulnerable parts and ensuring the success rate of arc initiation. Specifically, when the calculated initial value of the target arc-guiding current is less than the preset lower limit, the initial value of the target arc-guiding current is adjusted to the preset lower limit; when the calculated initial value of the target arc-guiding current is greater than 0.8 times the preset upper limit, the initial value of the target arc-guiding current is adjusted to 0.8 times the preset upper limit; if the calculated initial value of the target arc-guiding current is between the preset lower limit and 0.8 times the preset upper limit, no adjustment is required.

[0058] After the initial value of the target pilot arc current to be used when the gun switch is pressed next is finally determined, the initial value of the target pilot arc current can be stored. When the gun switch is detected to be pressed next time, the initial value of the target pilot arc current can be used as the current initial value of the pilot arc current. Thus, the arc can be controlled to start according to the initial value of the target pilot arc current, and the initial value of the target pilot arc current for the next round can be calculated.

[0059] The technical solution provided by this invention, whenever the gun switch is detected to be pressed, controls arc ignition based on the current initial value of the pilot arc current, and simultaneously begins detecting the pilot arc current. Then, when the pilot arc current is detected, a first timer and a second timer are started, and the cutting arc current is also detected. If arc ignition is successful based on the detected cutting arc current, the first timer stops, and the initial value of the target pilot arc current for the next time the gun switch is pressed is determined based on the first timer's timing result and the current initial value of the pilot arc current. If an abnormal arc break is detected based on both the detected cutting arc current and the pilot arc current, the second timer stops, and the initial value of the target pilot arc current for the next time the gun switch is pressed is determined based on the second timer's timing result and the current initial value of the pilot arc current. By calculating the initial value of the pilot arc current to be used each time the gun switch is pressed in real time through software, a suitable pilot arc current can be matched in real time according to the user's actual application scenario. This solves the problem that a fixed pilot arc current may be too low in some scenarios, resulting in discontinuous pilot arcs and poor arc ignition, while a fixed current may be too high in other scenarios, leading to heavy wear on the cutting gun's vulnerable parts.

[0060] Example 2

[0061] Figure 2 This is a schematic diagram of the structure of the plasma cutting machine pilot arc current control device provided in Embodiment 2 of the present invention. The device can be implemented by hardware and / or software and is generally integrated into the plasma cutting machine to execute the plasma cutting machine pilot arc current control method provided in any embodiment of the present invention.

[0062] like Figure 2 As shown, the device includes:

[0063] The pilot arc current detection module 21 is used to control the arc initiation according to the current initial value of the pilot arc current when the gun switch is detected to be pressed, and to start detecting the pilot arc current.

[0064] The arc current detection module 22 is used to start the first timer and the second timer respectively when the pilot arc current is detected, and to start detecting the arc current.

[0065] The first target arc current initial value determination module 23 is used to control the first timer to stop timing if the arc initiation is successful based on the detected cutting arc current, and to determine the target arc current initial value to be used when the gun switch is pressed next time based on the first timing result of the first timer and the current arc current initial value.

[0066] The second target arc current initial value determination module 24 is used to control the second timer to stop timing if an abnormal arc break is determined based on the detected cutting arc current and arc current, and to determine the target arc current initial value to be used when the gun switch is pressed next time based on the second timing result of the second timer and the current arc current initial value.

[0067] The technical solution provided by this invention, whenever the gun switch is detected to be pressed, controls arc ignition based on the current initial value of the pilot arc current, and simultaneously begins detecting the pilot arc current. Then, when the pilot arc current is detected, a first timer and a second timer are started, and the cutting arc current is also detected. If arc ignition is successful based on the detected cutting arc current, the first timer stops, and the initial value of the target pilot arc current for the next time the gun switch is pressed is determined based on the first timer's timing result and the current initial value of the pilot arc current. If an abnormal arc break is detected based on both the detected cutting arc current and the pilot arc current, the second timer stops, and the initial value of the target pilot arc current for the next time the gun switch is pressed is determined based on the second timer's timing result and the current initial value of the pilot arc current. By calculating the initial value of the pilot arc current to be used each time the gun switch is pressed in real time through software, a suitable pilot arc current can be matched in real time according to the user's actual application scenario. This solves the problem that a fixed pilot arc current may be too low in some scenarios, resulting in discontinuous pilot arcs and poor arc ignition, while a fixed current may be too high in other scenarios, leading to heavy wear on the cutting gun's vulnerable parts.

[0068] Based on the above technical solution, optionally, the plasma cutting machine's guiding arc current control device further includes:

[0069] The arc ignition success determination module is used to determine that the arc ignition is successful if the detected arc current is greater than the first current threshold after the start of arc current detection.

[0070] The abnormal arc interruption determination module is used to determine an abnormal arc interruption if, after the start of detecting the cutting arc current, the detected cutting arc current is less than the first current threshold and the detected guiding arc current is less than the second current threshold.

[0071] Based on the above technical solution, optionally, the first target guiding arc current initial value determination module 23 is specifically used for:

[0072] If the first timing result is less than the first time threshold, then the initial value of the target pilot arc current is the difference between the current initial value of the pilot arc current and the first current value; otherwise, the initial value of the target pilot arc current is the difference between the current initial value of the pilot arc current and the second current value.

[0073] Based on the above technical solution, optionally, the second target guiding arc current initial value determination module 24 is specifically used for:

[0074] If the second timing result is less than the second time threshold, the initial value of the target pilot arc current is the sum of the current initial value of the pilot arc current and the third current value; otherwise, the initial value of the target pilot arc current is the sum of the current initial value of the pilot arc current and the fourth current value.

[0075] Based on the above technical solution, optionally, the plasma cutting machine's guiding arc current control device further includes:

[0076] The target pilot arc current initial value adjustment module is used to adjust the target pilot arc current initial value according to a preset lower limit value and a preset upper limit value, after the target pilot arc current initial value is determined based on the current pilot arc current initial value according to the first timing result of the first timer, or after the target pilot arc current initial value is determined based on the current pilot arc current initial value according to the second timing result of the second timer, the target pilot arc current initial value is adjusted based on the current pilot arc current initial value.

[0077] Based on the above technical solution, optionally, the arc current detection module 21 is specifically used for:

[0078] The initial value of the current guiding arc current is increased at a preset rate.

[0079] Based on the above technical solution, optionally, if this is the first time the gun switch has been pressed, the initial value of the current guiding arc current is a preset initial value; the guiding arc current detection module 21 is specifically used for:

[0080] Arc initiation is controlled using the fixed preset initial value.

[0081] The plasma cutting machine guide arc current control device provided in this embodiment of the invention can execute the plasma cutting machine guide arc current control method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method.

[0082] It is worth noting that in the above embodiments of the plasma cutting machine guide arc current control device, the various units and modules included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of each functional unit are only for easy differentiation and are not used to limit the scope of protection of the present invention.

[0083] Example 3

[0084] Figure 3This is a schematic diagram of the structure of a plasma cutting machine provided in Embodiment 3 of the present invention, showing a block diagram of an exemplary plasma cutting machine suitable for implementing the embodiments of the present invention. Figure 3 The plasma cutting machine shown is merely an example and should not be construed as limiting the functionality or scope of the embodiments of the present invention. Figure 3 As shown, the plasma cutting machine includes a processor 31 and a memory 32; the number of processors 31 in the plasma cutting machine can be one or more. Figure 3 Taking a processor 31 as an example, the processor 31 and memory 32 in the plasma cutter can be connected via a bus or other means. Figure 3 Taking the example of a connection between China and Israel via a bus.

[0085] The memory 32, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as the program instructions / modules corresponding to the plasma cutting machine pilot arc current control method in this embodiment of the invention (e.g., the pilot arc current detection module 21, the cutting arc current detection module 22, the first target pilot arc current initial value determination module 23, and the second target pilot arc current initial value determination module 24 in the plasma cutting machine pilot arc current control device). The processor 31 executes various functional applications and data processing of the plasma cutting machine by running the software programs, instructions, and modules stored in the memory 32, thereby realizing the above-described plasma cutting machine pilot arc current control method.

[0086] The memory 32 may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a given function; the data storage area may store data created based on the use of the plasma cutter. Furthermore, the memory 32 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 32 may further include memory remotely located relative to the processor 31, which can be connected to the plasma cutter via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0087] The processor 31 is used to run a computer-executable program stored in the memory 32 to perform the following steps: S11, when the gun switch is detected to be pressed, arc initiation is controlled according to the current initial value of the pilot arc current, and the pilot arc current is detected; S12, when the pilot arc current is detected, the first timer and the second timer are started to start timing, and the cutting arc current is detected; S13, if the arc initiation is determined to be successful based on the detected cutting arc current, the first timer is controlled to stop timing, and the target pilot arc current initial value used when the gun switch is pressed next is determined based on the first timing result of the first timer and the current initial value of the pilot arc current; S14, if an abnormal arc break is determined based on the detected cutting arc current and the pilot arc current, the second timer is controlled to stop timing, and the target pilot arc current initial value used when the gun switch is pressed next is determined based on the second timing result of the second timer and the current initial value of the pilot arc current.

[0088] Of course, the plasma cutting machine provided in the embodiments of the present invention is not limited to the operation of the method described above, and can also perform related operations in the plasma cutting machine guide arc current control method provided in any embodiment of the present invention.

[0089] The plasma cutting machine provided in this invention calculates the initial value of the guiding arc current to be used each time the gun switch is pressed in real time through software. It can match the appropriate guiding arc current in real time according to the user's actual application scenario, which solves the problem that in some scenarios the current is too small, the guiding arc is discontinuous and it is difficult to start the arc, while in other scenarios the current is too large, and the wear and tear of the cutting gun's vulnerable parts is heavy.

[0090] Example 4

[0091] Embodiment 4 of the present invention also provides a storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to perform a method for controlling the pilot arc current of a plasma cutting machine, the method comprising:

[0092] When the gun switch is detected to be pressed, the arc is initiated according to the current initial value of the pilot arc current, and the pilot arc current is detected.

[0093] When the pilot arc current is detected, the first timer and the second timer are started to begin timing, and the cutting arc current is detected.

[0094] If the arc initiation is successfully determined based on the detected cutting arc current, the first timer is controlled to stop timing, and the target initial value of the pilot arc current to be used when the gun switch is pressed next is determined based on the first timing result of the first timer and the current initial value of the pilot arc current.

[0095] If an abnormal arc break is determined based on the detected cutting arc current and pilot arc current, the second timer is controlled to stop timing, and the target pilot arc current initial value used when the gun switch is pressed next is determined based on the second timing result of the second timer and the current pilot arc current initial value.

[0096] Storage media can be any type of memory device or storage device. The term "storage media" is intended to include: mounting media, such as CD-ROMs, floppy disks, or magnetic tape devices; computer system memory or random access memory, such as DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM, etc.; non-volatile memory, such as flash memory, magnetic media (e.g., hard disks or optical storage); registers or other similar types of memory elements. Storage media may also include other types of memory or combinations thereof. Furthermore, storage media may reside in a computer system in which the program is executed, or may reside in a different second computer system connected to the computer system via a network (such as the Internet). The second computer system can provide program instructions to the computer for execution. The term "storage media" can include two or more storage media that may reside in different locations (e.g., in different computer systems connected via a network). Storage media may store program instructions (e.g., specifically implemented as a computer program) that can be executed by one or more processors.

[0097] Of course, the computer-executable instructions provided in the embodiments of the present invention are not limited to the method operations described above, but can also perform related operations in the plasma cutting machine guide arc current control method provided in any embodiment of the present invention.

[0098] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of sending, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0099] Program code contained on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0100] Based on the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0101] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for controlling the guiding arc current of a plasma cutting machine, characterized in that, include: When the gun switch is detected to be pressed, the arc is initiated according to the current initial value of the pilot arc current, and the pilot arc current is detected. When the pilot arc current is detected, the first timer and the second timer are started to begin timing, and the cutting arc current is detected. If the arc initiation is successfully determined based on the detected cutting arc current, the first timer is controlled to stop timing, and the target initial value of the pilot arc current to be used when the gun switch is pressed next is determined based on the first timing result of the first timer and the current initial value of the pilot arc current. If an abnormal arc break is determined based on the detected cutting arc current and pilot arc current, the second timer is controlled to stop timing, and the target pilot arc current initial value used when the gun switch is pressed next is determined based on the second timing result of the second timer and the current pilot arc current initial value. The step of determining the initial value of the target pilot arc current to be used when the gun switch is pressed next time, based on the first timing result of the first timer and the current initial value of the pilot arc current, includes: If the first timing result is less than the first time threshold, then the initial value of the target pilot arc current is the difference between the current initial value of the pilot arc current and the first current value; otherwise, the initial value of the target pilot arc current is the difference between the current initial value of the pilot arc current and the second current value. The determination of the target pilot arc current initial value used when the gun switch is pressed next time, based on the second timing result of the second timer and the current pilot arc current initial value, includes: If the second timing result is less than the second time threshold, the initial value of the target pilot arc current is the sum of the current initial value of the pilot arc current and the third current value; otherwise, the initial value of the target pilot arc current is the sum of the current initial value of the pilot arc current and the fourth current value.

2. The method for controlling the guiding arc current of a plasma cutting machine according to claim 1, characterized in that, After the start of detecting the cutting arc current, the method further includes: If the detected cutting arc current is greater than the first current threshold, the arc initiation is considered successful. If the detected cutting arc current is less than the first current threshold and the detected guiding arc current is less than the second current threshold, then an abnormal arc break is determined.

3. The method for controlling the guiding arc current of a plasma cutting machine according to claim 1, characterized in that, After determining the initial value of the target pilot arc current to be used when the gun switch is pressed next, based on the first timing result of the first timer and the current initial value of the pilot arc current, or after determining the initial value of the target pilot arc current to be used when the gun switch is pressed next, based on the second timing result of the second timer and the current initial value of the pilot arc current, the method further includes: The initial value of the target pilot arc current is adjusted according to the preset lower limit value and the preset upper limit value of the pilot arc current.

4. The method for controlling the guiding arc current of a plasma cutting machine according to claim 1, characterized in that, The step of controlling arc initiation based on the current initial value of the pilot arc current includes: The initial value of the current guiding arc current is increased at a preset rate.

5. The method for controlling the guiding arc current of a plasma cutting machine according to claim 1, characterized in that, If this is the first time the gun switch has been pressed, the initial value of the current pilot arc current is a preset initial value. The step of controlling arc initiation based on the current initial value of the pilot arc current includes: Arc initiation is controlled using the fixed preset initial value.

6. A plasma cutting machine guide arc current control device, characterized in that, include: The pilot arc current detection module is used to control arc initiation based on the current initial value of the pilot arc current when the gun switch is detected to be pressed, and to start detecting the pilot arc current. The arc current detection module is used to start the first timer and the second timer respectively when the pilot arc current is detected, and to start detecting the arc current. The first target arc current initial value determination module is used to control the first timer to stop timing if the arc initiation is successful based on the detected cutting arc current, and to determine the target arc current initial value to be used when the gun switch is pressed next time based on the first timing result of the first timer and the current arc current initial value. The second target pilot arc current initial value determination module is used to control the second timer to stop timing if an abnormal arc breakage is determined based on the detected cutting arc current and pilot arc current, and to determine the target pilot arc current initial value to be used when the gun switch is pressed next time based on the second timing result of the second timer and the current pilot arc current initial value. The step of determining the initial value of the target pilot arc current to be used when the gun switch is pressed next time, based on the first timing result of the first timer and the current initial value of the pilot arc current, includes: If the first timing result is less than the first time threshold, then the initial value of the target pilot arc current is the difference between the current initial value of the pilot arc current and the first current value; otherwise, the initial value of the target pilot arc current is the difference between the current initial value of the pilot arc current and the second current value. The determination of the target pilot arc current initial value used when the gun switch is pressed next time, based on the second timing result of the second timer and the current pilot arc current initial value, includes: If the second timing result is less than the second time threshold, the initial value of the target pilot arc current is the sum of the current initial value of the pilot arc current and the third current value; otherwise, the initial value of the target pilot arc current is the sum of the current initial value of the pilot arc current and the fourth current value.

7. A plasma cutting machine, characterized in that, include: One or more processors; Memory, used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the plasma cutting machine pilot arc current control method as described in any one of claims 1-5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by the processor, the program implements the plasma cutting machine pilot arc current control method as described in any one of claims 1-5.

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