CN117300316A - Method and device for controlling pilot arc current of plasma cutting machine and plasma cutting machine - Google Patents
Method and device for controlling pilot arc current of plasma cutting machine and plasma cutting machine Download PDFInfo
- Publication number
- CN117300316A CN117300316A CN202311307731.6A CN202311307731A CN117300316A CN 117300316 A CN117300316 A CN 117300316A CN 202311307731 A CN202311307731 A CN 202311307731A CN 117300316 A CN117300316 A CN 117300316A
- Authority
- CN
- China
- Prior art keywords
- arc current
- current
- pilot arc
- initial value
- timer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005520 cutting process Methods 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 51
- 230000002159 abnormal effect Effects 0.000 claims description 20
- 238000001514 detection method Methods 0.000 claims description 12
- 238000004590 computer program Methods 0.000 claims description 3
- 239000002609 medium Substances 0.000 description 17
- 238000010586 diagram Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 239000012120 mounting media Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
Abstract
The embodiment of the invention discloses a method and a device for controlling pilot arc current of a plasma cutting machine and the plasma cutting machine. The method comprises the following steps: when the gun switch is detected to be pressed, starting an arc according to the current initial value control of the pilot arc current, and starting to detect the pilot arc current; when the pilot arc current is detected, starting a first timer and a second timer to count, and starting to detect the cutting arc current; if the arcing is successful, the first timer is controlled to stop timing, and a target pilot arc current initial value used when a gun switch is pressed next time is determined according to the current pilot arc current initial value based on a first timing result of the first timer; if the arc is abnormally broken, the second timer is controlled to stop timing, and the target initial pilot arc current value used when the gun switch is pressed next time is determined according to the current initial pilot arc current value based on the second timing result of the second timer. Therefore, the proper pilot arc current can be matched in real time according to the actual application scene of the user.
Description
Technical Field
The embodiment of the invention relates to the technical field of plasma cutting machines, in particular to a method and a device for controlling pilot arc current of a plasma cutting machine and the plasma cutting machine.
Background
Plasma technology has been widely used in fields such as industry, chemistry, national defense, communication, etc., and plasma cutting is a high-speed and high-precision metal material cutting method, and compared with traditional flame cutting, plasma cutting has been increasingly used in the field of metal cutting by virtue of advantages such as rapid cutting speed, good cutting quality, etc. The arcing mode of the air plasma cutting machine generally comprises two modes of contact arcing and non-contact arcing. Contact arcing, i.e., the nozzle of the cutting gun is in contact with the workpiece (output positive electrode), and then the arc is ignited by high frequency discharge between the electrode (output negative electrode) of the cutting gun and the nozzle. The method comprises the steps that when non-contact arcing is performed, a nozzle of a cutting gun does not need to contact a workpiece, an output positive electrode is firstly connected with the nozzle of the cutting gun through a control switch, then an arc is established and maintained between an electrode and the nozzle in a high-frequency or contact mode, the arc is compressed through compressed air and is ejected out of the nozzle to form a guide arc, finally the guide arc is contacted with the workpiece, when current is detected to flow through the workpiece from the electrode, guide arc control is closed (namely, connection between the positive electrode and the nozzle is disconnected), and the current flows through the workpiece through the electrode, namely, a main arc is ignited.
The nozzle is easy to burn at the moment of arcing in a contact arcing mode, and the cutting current is larger and more obvious, so that a model with the output current larger than 40A generally adopts a non-contact arcing mode. The non-contact arcing needs to establish a pilot arc between the electrode and the nozzle, the pilot arc current is smaller than the normal cutting current, and currently, two schemes are adopted for controlling the pilot arc current, one is a power resistance current limiting mode, the other is a constant current control mode, and the pilot arc current of the two control schemes is a fixed value which is initially set. To meet the normal arcing of the user under various conditions, the pilot arc current is often set to an upper limit value of the selectable current. The larger pilot arc current, while guaranteeing pilot arc success rate, also increases electrode and nozzle consumption.
Disclosure of Invention
The embodiment of the invention provides a method and a device for controlling pilot arc current of a plasma cutting machine and the plasma cutting machine, which are used for solving the problems that the pilot arc current is small in some situations, the pilot arc is discontinuous and is not easy to start, and the vulnerable part of the cutting gun is heavy in some situations.
In a first aspect, an embodiment of the present invention provides a pilot arc current control method for a plasma cutting machine, where the method includes:
when the gun switch is detected to be pressed, starting an arc according to the current initial value control of the pilot arc current, and starting to detect the pilot arc current;
when the pilot arc current is detected, starting a first timer and a second timer respectively to start timing, and starting to detect the cutting arc current;
if the arc starting is judged to be successful based on the detected cutting arc current, controlling the first timer to stop timing, and determining a target initial pilot arc current value used when a gun switch is pressed next time based on a first timing result of the first timer according to the current initial pilot arc current value;
and if abnormal arc interruption is judged based on the detected cutting arc current and pilot arc current, controlling the second timer to stop timing, and determining a target pilot arc current initial value used when a gun switch is pressed next time according to the current pilot arc current initial value based on a second timing result of the second timer.
Optionally, after the start of detecting the cutting arc current, the method further includes:
if the detected cutting arc current is larger than a first current threshold value, judging that the arc starting is successful;
and if the detected cutting arc current is smaller than the first current threshold value and the detected guiding arc current is smaller than the second current threshold value, judging abnormal arc breaking.
Optionally, the determining, based on the first timing result of the first timer, a target pilot arc current initial value used when the gun switch is pressed next time according to the current pilot arc current initial value includes:
if the first timing result is smaller than a first time threshold, the target pilot arc current initial value is the difference value between the current pilot arc current initial value and a first current value, otherwise, the target pilot arc current initial value is the difference value between the current pilot arc current initial value and a second current value.
Optionally, the determining, based on the second timing result of the second timer, a target pilot arc current initial value used when the gun switch is pressed next time according to the current pilot arc current initial value includes:
and if the second timing result is smaller than a second time threshold, the target pilot arc current initial value is the sum of the current pilot arc current initial value and a third current value, otherwise, the target pilot arc current initial value is the sum of the current pilot arc current initial value and a fourth current value.
Optionally, after the determining, based on the first timing result of the first timer, the target initial pilot arc current value used when the gun switch is pressed next according to the current initial pilot arc current value, or after the determining, based on the second timing result of the second timer, the target initial pilot arc current value used when the gun switch is pressed next according to the current initial pilot arc current value, the method further includes:
and adjusting the initial value of the target pilot arc current according to the preset pilot arc current lower limit value and the preset pilot arc current upper limit value.
Optionally, the arc starting is controlled according to the initial value of the current pilot arc current, including:
and increasing the initial value of the current pilot arc current according to a preset speed.
Optionally, if the gun switch is detected to be pressed for the first time, the initial value of the current pilot arc current is a preset initial value;
the arc starting is controlled according to the initial value of the current pilot arc current, which comprises the following steps:
and controlling to start an arc by using the fixed preset initial value.
In a second aspect, an embodiment of the present invention further provides a pilot arc current control device for a plasma cutting machine, where the device includes:
the pilot arc current detection module is used for controlling to start an arc according to the initial value of the current pilot arc current when the gun switch is detected to be pressed down, and starting to detect the pilot arc current;
the cutting arc current detection module is used for starting the first timer and the second timer to start timing when the pilot arc current is detected, and starting to detect the cutting arc current;
the first target pilot arc current initial value determining module is used for controlling the first timer to stop timing if the arc starting is judged to be successful based on the detected cutting arc current, and determining a target pilot arc current initial value used when a gun switch is pressed next time based on a first timing result of the first timer according to the current pilot arc current initial value;
and the second target pilot arc current initial value determining module is used for controlling the second timer to stop timing if abnormal arc interruption is determined based on the detected cutting arc current and pilot arc current, and determining a target pilot arc current initial value used when a gun switch is pressed next time according to the current pilot arc current initial value based on a second timing result of the second timer.
In a third aspect, an embodiment of the present invention further provides a plasma cutting machine, including:
one or more processors;
a memory for storing one or more programs;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the pilot arc current control method for a plasma cutter provided by any of the embodiments of the present invention.
In a fourth aspect, an embodiment of the present invention further provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the pilot arc current control method of the plasma cutter provided in any embodiment of the present invention.
The embodiment of the invention provides a pilot arc current control method of a plasma cutting machine, which is used for controlling to start an arc according to a current pilot arc current initial value whenever a gun switch is detected to be pressed, starting to detect pilot arc current at the same time, respectively starting a first timer and a second timer to start timing when the pilot arc current is detected, starting to detect cutting arc current at the same time, controlling the first timer to stop timing if the arc starting is judged to be successful based on the detected cutting arc current, determining a target pilot arc current initial value used when the gun switch is pressed next according to the current pilot arc current initial value based on a first timing result of the first timer, controlling the second timer to stop timing if abnormal arc interruption is judged based on the detected cutting arc current and the pilot arc current, and determining a target pilot arc current initial value used when the gun switch is pressed next based on a second timing result of the second timer. According to the pilot arc current control method of the plasma cutting machine, the pilot arc current initial value to be used when the gun switch is pressed down each time is calculated in real time through software, proper pilot arc current can be matched in real time according to actual application scenes of users, and the problems that fixed pilot arc current is small in some scenes, pilot arc is discontinuous and is not good to start, and in some scenes, current is large and damage to vulnerable parts of the cutting gun is heavy are solved.
Drawings
Fig. 1 is a flowchart of a method for controlling pilot arc current of a plasma cutting machine according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pilot arc current control device of a plasma cutting machine according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a plasma cutting machine according to a third embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart depicts steps as a sequential process, many of the steps may be implemented in parallel, concurrently, or with other steps. Furthermore, the order of the steps may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Furthermore, the terms "first," "second," and the like, may be used herein to describe various directions, acts, steps, or elements, etc., but these directions, acts, steps, or elements are not limited by these terms. These terms are only used to distinguish one direction, action, step or element from another direction, action, step or element. For example, a first timer may be referred to as a second timer, and similarly, a second timer may be referred to as a first timer, without departing from the scope of embodiments of the present invention. Both the first timer and the second timer are timers, but they are not the same timer. The terms "first," "second," and the like, are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may include one or more of the feature, either explicitly or implicitly. In the description of the embodiments of the present invention, the meaning of "plurality" is at least two, for example, two, three, etc., unless explicitly defined otherwise.
Example 1
Fig. 1 is a flowchart of a pilot arc current control method of a plasma cutting machine according to an embodiment of the invention. The embodiment is applicable to the situation of controlling the plasma cutting machine to start an arc, the method can be executed by the arc current guiding control device of the plasma cutting machine, and the device can be realized by hardware and/or software, can be generally integrated in the plasma cutting machine and can be specifically realized by a singlechip in the plasma cutting machine. As shown in fig. 1, the method specifically comprises the following steps:
and S11, when the gun switch is detected to be pressed, starting the arc according to the current initial value control of the pilot arc current, and starting to detect the pilot arc current.
Specifically, the method can be realized under the condition that the existing control circuit does not increase hardware cost additionally, an electrode of the cutting gun is connected with an output cathode of the plasma cutting machine, and a nozzle of the cutting gun is connected with an output anode of the plasma cutting machine through a guide arc circuit.
Each time the gun switch is detected to be pressed, the current stored initial value of pilot arc current can be used for controlling the starting of the arc, and the actual generated pilot arc current starts to be detected. Optionally, the arc starting is controlled according to the initial value of the current pilot arc current, including: the initial value of the current pilot arc current is increased according to the preset speed, namely, after starting control to start an arc, the pilot arc current given value control obtained by continuously increasing the initial value of the current pilot arc current is used for starting the arc in a given mode of initial value+slope increase, so that the loss of the pilot arc to the vulnerable part can be further reduced, and the success rate of starting the arc can be improved. Further, the preset speed used for increasing may be determined according to the magnitude of the initial value of the current pilot arc current, specifically, the initial value of the current pilot arc current may be compared with a preset pilot arc current lower limit value and a preset pilot arc current upper limit value, if the initial value of the current pilot arc current is less than half of the sum of the preset pilot arc current lower limit value and the preset pilot arc current upper limit value, the pilot arc current given value may be the initial value of the current pilot arc current+the first preset speed (e.g. 1A/0.1 s), and if the initial value of the current pilot arc current is equal to or greater than half of the sum of the preset pilot arc current lower limit value and the preset pilot arc current upper limit value, the pilot arc current given value may be the initial value of the current pilot arc current+the second preset speed (e.g. 0.5A/0.1 s). Namely, when the initial value of the current pilot arc current is smaller, the current pilot arc current can be increased by using a larger preset speed, and when the initial value of the current pilot arc current is larger, the current pilot arc current can be increased by using a smaller preset speed, so that vulnerable parts are better protected, and the success rate of arcing is ensured.
Optionally, if the gun switch is detected to be pressed for the first time, the initial value of the current pilot arc current is a preset initial value; the arc starting is controlled according to the initial value of the current pilot arc current, which comprises the following steps: the fixed preset initial value control is used for starting the arc, namely, when the gun switch is detected to be pressed for the first time, the fixed preset initial value can be used as the pilot arc current set value control for starting the arc. In addition, after the start-up self-check of the plasma cutting machine is finished, when the gun switch is detected to be pressed for the first time, the singlechip simultaneously opens high frequency, pilot arc control and air valve control, and after the delay advances the air supply time, the singlechip opens IGBT driving control, so that the start control starts to start an arc, and meanwhile, the pilot arc current actually generated can be detected.
And S12, when the pilot arc current is detected, starting a first timer and a second timer respectively to start timing, and starting to detect the cutting arc current.
Specifically, when the pilot arc current is detected, the pilot arc is considered to be established, and at this time, two timers can be started simultaneously to start timing, and the cutting arc current is started to be detected. Wherein the first timer can be used for counting the time from the establishment of the pilot arc to the successful start of the pilot arc, and the second timer can be used for counting the time from the establishment of the pilot arc to the abnormal arc interruption, so that the initial value of the pilot arc current used next time is conveniently adjusted according to the counted time.
Optionally, after the start of detecting the cutting arc current, the method further includes: if the detected cutting arc current is larger than a first current threshold value, judging that the arc starting is successful; and if the detected cutting arc current is smaller than the first current threshold value and the detected guiding arc current is smaller than the second current threshold value, judging abnormal arc breaking. Preferably, the first current threshold is 7A, and the second current threshold is 3A. When the cutting arc current is detected to be larger than the first current threshold value, the arc starting success can be judged, the cutting operation can be carried out, when the cutting arc current is detected to be smaller than or equal to the first current threshold value, the fact that the guide arc is not transferred to the cutting arc or is not transferred successfully can be judged, the detected guide arc current can be referred to, if the guide arc current is smaller than the second current threshold value, the abnormal arc breaking can be judged, and otherwise, the detection can be continued.
And S13, if the arc starting is judged to be successful based on the detected cutting arc current, controlling the first timer to stop counting, and determining a target initial value of the pilot arc current used when the gun switch is pressed next time based on a first timing result of the first timer according to the current initial value of the pilot arc current.
Specifically, if it is determined that the arcing is successful, the first timer may be controlled to stop counting to obtain a first timing result, and then the current initial value of the pilot arc current may be adjusted according to the first timing result to obtain the target initial value of the pilot arc current used when the gun switch is pressed next time.
Optionally, the determining, based on the first timing result of the first timer, a target pilot arc current initial value used when the gun switch is pressed next time according to the current pilot arc current initial value includes: if the first timing result is smaller than a first time threshold, the target pilot arc current initial value is the difference value between the current pilot arc current initial value and a first current value, otherwise, the target pilot arc current initial value is the difference value between the current pilot arc current initial value and a second current value. The first current value may 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. Namely, when the duration required by successful arc starting is shorter, the initial value of the target pilot arc current used next time can be reduced more, and when the duration required by successful arc starting is longer, the initial value of the target pilot arc current used next time can be reduced less, so that vulnerable parts are better protected, and the success rate of arc starting is ensured.
And S14, if abnormal arc interruption is judged based on the detected cutting arc current and the pilot arc current, controlling the second timer to stop timing, and determining a target pilot arc current initial value used when a gun switch is pressed next time according to the current pilot arc current initial value based on a second timing result of the second timer.
Specifically, if it is determined that the arc is abnormally broken, the second timer may be controlled to stop counting, so as to obtain a second timing result, and then the initial value of the current pilot arc current may be adjusted according to the second timing result, so as to obtain the initial value of the target pilot arc current used when the gun switch is pressed next time.
Optionally, the determining, based on the second timing result of the second timer, a target pilot arc current initial value used when the gun switch is pressed next time according to the current pilot arc current initial value includes: and if the second timing result is smaller than a second time threshold, the target pilot arc current initial value is the sum of the current pilot arc current initial value and a third current value, otherwise, the target pilot arc current initial value is the sum of the current pilot arc current initial value and a fourth current value. Wherein the third current value may be greater than the fourth current value, and preferably, the second time threshold is 1s, the third current value is 2A, and the fourth current value is 1A. Namely, when the duration of abnormal arc interruption is shorter, the initial value of the target pilot arc current used next time can be increased more, and when the duration of abnormal arc interruption is longer, the initial value of the target pilot arc current used next time can be increased less, so that the success rate of arcing is improved better, and meanwhile, vulnerable parts are protected.
On the basis of the above technical solution, optionally, after the determining, based on the first timing result of the first timer, the target pilot arc current initial value used when the gun switch is pressed next according to the current pilot arc current initial value, or after the determining, based on the second timing result of the second timer, the target pilot arc current initial value used when the gun switch is pressed next according to the current pilot arc current initial value, the method further includes: and adjusting the initial value of the target pilot arc current according to the preset pilot arc current lower limit value and the preset pilot arc current upper limit value.
Specifically, after the initial value of the target pilot arc current to be used when the gun switch is pressed next time is calculated, the initial value of the target pilot arc current can be adjusted according to the preset pilot arc current lower limit value and the preset pilot arc current upper limit value, so that the calculated value is prevented from exceeding a reasonable range, and the vulnerable part is better protected and the arcing success rate is guaranteed. Specifically, when the calculated initial value of the target pilot arc current is smaller than the preset pilot arc current lower limit value, the initial value of the target pilot arc current is adjusted to the preset pilot arc current lower limit value, and when the calculated initial value of the target pilot arc current is larger than the preset pilot arc current upper limit value by 0.8 times, the initial value of the target pilot arc current is adjusted to the preset pilot arc current upper limit value by 0.8 times, if the calculated initial value of the target pilot arc current is between the preset pilot arc current lower limit value and the preset pilot arc current upper limit value by 0.8 times, the adjustment is not performed.
After the initial value of the target pilot arc current to be used when the gun switch is pressed next time is finally determined, the initial value of the target pilot arc current can be stored, and the initial value of the target pilot arc current can be used as the initial value of the current pilot arc current when the gun switch is detected to be pressed next time, so that the starting of an arc can be controlled according to the initial value of the target pilot arc current, and the initial value of the target pilot arc current of the next round can be calculated.
According to the technical scheme provided by the embodiment of the invention, when the gun switch is detected to be pressed, the arc starting is controlled according to the current initial value of the pilot arc current, the pilot arc current is detected at the same time, then when the pilot arc current is detected, the first timer and the second timer are respectively started to start timing, the cutting arc current is detected at the same time, then if the arc starting is judged to be successful based on the detected cutting arc current, the first timer is controlled to stop timing, the initial value of the target pilot arc current used when the gun switch is pressed next time is determined according to the current initial value of the pilot arc current based on the first timing result of the first timer, if the abnormal arc breaking is judged based on the detected cutting arc current and the pilot arc current, the second timer is controlled to stop timing, and the initial value of the target pilot arc current used when the gun switch is pressed next time is determined according to the current initial value of the second timing result of the second timer. The initial value of the pilot arc current to be used when the gun switch is pressed down is calculated in real time through software, and the proper pilot arc current can be matched in real time according to the actual application scene of a user, so that the problems that the fixed pilot arc current is smaller in some scene currents, discontinuous in pilot arcs, poor in arcing, larger in some scene currents and heavy in damage of vulnerable parts of the cutting gun are solved.
Example two
Fig. 2 is a schematic structural diagram of a pilot arc current control device of a plasma cutting machine according to a second embodiment of the present invention, where the device may be implemented in hardware and/or software, and may be generally integrated in a plasma cutting machine, for executing the pilot arc current control method of a plasma cutting machine according to any embodiment of the present invention.
As shown in fig. 2, the apparatus includes:
a pilot arc current detection module 21 for controlling to start an arc according to a current pilot arc current initial value and starting to detect a pilot arc current when it is detected that the gun switch is pressed;
a cutting arc current detection module 22, configured to start the first timer and the second timer to start timing when the pilot arc current is detected, and start detecting the cutting arc current;
a first target pilot arc current initial value determining module 23, configured to control the first timer to stop counting if it is determined that the arcing is successful based on the detected cutting arc current, and determine a target pilot arc current initial value used when the gun switch is pressed next time according to the current pilot arc current initial value based on a first counting result of the first timer;
and a second target pilot arc current initial value determining module 24, configured to control the second timer to stop timing if an abnormal arc interruption is determined based on the detected cutting arc current and pilot arc current, and determine a target pilot arc current initial value used when the gun switch is pressed next according to the current pilot arc current initial value based on a second timing result of the second timer.
According to the technical scheme provided by the embodiment of the invention, when the gun switch is detected to be pressed, the arc starting is controlled according to the current initial value of the pilot arc current, the pilot arc current is detected at the same time, then when the pilot arc current is detected, the first timer and the second timer are respectively started to start timing, the cutting arc current is detected at the same time, then if the arc starting is judged to be successful based on the detected cutting arc current, the first timer is controlled to stop timing, the initial value of the target pilot arc current used when the gun switch is pressed next time is determined according to the current initial value of the pilot arc current based on the first timing result of the first timer, if the abnormal arc breaking is judged based on the detected cutting arc current and the pilot arc current, the second timer is controlled to stop timing, and the initial value of the target pilot arc current used when the gun switch is pressed next time is determined according to the current initial value of the second timing result of the second timer. The initial value of the pilot arc current to be used when the gun switch is pressed down is calculated in real time through software, and the proper pilot arc current can be matched in real time according to the actual application scene of a user, so that the problems that the fixed pilot arc current is smaller in some scene currents, discontinuous in pilot arcs, poor in arcing, larger in some scene currents and heavy in damage of vulnerable parts of the cutting gun are solved.
On the basis of the technical scheme, optionally, the pilot arc current control device of the plasma cutting machine further comprises:
the arcing success judging module is used for judging that the arcing is successful if the detected cutting arc current is larger than a first current threshold value after the cutting arc current starts to be detected;
the abnormal arc interruption judging module is used for judging abnormal arc interruption if the detected cutting arc current is smaller than the first current threshold value and the detected guiding arc current is smaller than the second current threshold value after the cutting arc current starts to be detected.
On the basis of the above technical solution, optionally, the first target pilot arc current initial value determining module 23 is specifically configured to:
if the first timing result is smaller than a first time threshold, the target pilot arc current initial value is the difference value between the current pilot arc current initial value and a first current value, otherwise, the target pilot arc current initial value is the difference value between the current pilot arc current initial value and a second current value.
On the basis of the above technical solution, optionally, the second target pilot arc current initial value determining module 24 is specifically configured to:
and if the second timing result is smaller than a second time threshold, the target pilot arc current initial value is the sum of the current pilot arc current initial value and a third current value, otherwise, the target pilot arc current initial value is the sum of the current pilot arc current initial value and a fourth current value.
On the basis of the technical scheme, optionally, the pilot arc current control device of the plasma cutting machine further comprises:
and the target pilot arc current initial value adjusting module is used for adjusting the target pilot arc current initial value according to a preset pilot arc current lower limit value and a preset pilot arc current upper limit value after the first timing result based on the first timer determines the target pilot arc current initial value used when the gun switch is pressed next time according to the current pilot arc current initial value or after the second timing result based on the second timer determines the target pilot arc current initial value used when the gun switch is pressed next time according to the current pilot arc current initial value.
On the basis of the above technical solution, optionally, the pilot arc current detection module 21 is specifically configured to:
and increasing the initial value of the current pilot arc current according to a preset speed.
On the basis of the technical scheme, optionally, if the gun switch is detected to be pressed for the first time, the initial value of the current pilot arc current is a preset initial value; the pilot arc current detection module 21 specifically functions to:
and controlling to start an arc by using the fixed preset initial value.
The device for controlling the pilot arc current of the plasma cutting machine provided by the embodiment of the invention can execute the method for controlling the pilot arc current of the plasma cutting machine provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
It should be noted that, in the above embodiment of the pilot arc current control device of the plasma cutting machine, each unit and module included are only divided according to the functional logic, but are not limited to the above division, so long as the corresponding functions can be implemented; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
Example III
Fig. 3 is a schematic structural diagram of a plasma cutter according to a third embodiment of the present invention, and shows a block diagram of an exemplary plasma cutter suitable for implementing an embodiment of the present invention. The plasma cutter shown in fig. 3 is only an example and should not be construed as limiting the function and scope of use of the embodiments of the present invention. As shown in fig. 3, the plasma cutter includes a processor 31 and a memory 32; the number of processors 31 in the plasma cutter may be one or more, and in fig. 3, one processor 31 is taken as an example, and the processors 31 and the memory 32 in the plasma cutter may be connected by a bus or other means, and in fig. 3, the connection by a bus is taken as an example.
The memory 32 is used as a computer readable storage medium for storing software programs, computer executable programs and modules, such as program instructions/modules corresponding to the pilot arc current control method of the plasma cutting machine in the embodiment of the present invention (for example, 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 pilot arc current control device of the plasma cutting machine). The processor 31 executes various functional applications and data processing of the plasma cutter by running software programs, instructions and modules stored in the memory 32, i.e., implements the above-described pilot arc current control method of the plasma cutter.
The memory 32 may mainly include a storage program area that may store an operating system, at least one application program required for functions, and a storage data area; the stored data area may store data created according to the use of the plasma cutter, etc. In addition, memory 32 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, memory 32 may further include memory remotely located relative to processor 31, which may be connected to the plasma cutter through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The processor 31 is for running a computer executable program stored in the memory 32 to implement the steps of: s11, when the gun switch is detected to be pressed down, starting an arc according to the current initial value control of the pilot arc current, and starting to detect the pilot arc current; s12, when the pilot arc current is detected, starting a first timer and a second timer respectively to start timing, and starting to detect the cutting arc current; s13, if the arc starting is judged to be successful based on the detected cutting arc current, controlling the first timer to stop timing, and determining a target initial pilot arc current value used when a gun switch is pressed next time based on a first timing result of the first timer according to the current initial pilot arc current value; and S14, if abnormal arc interruption is judged based on the detected cutting arc current and the pilot arc current, controlling the second timer to stop timing, and determining a target pilot arc current initial value used when a gun switch is pressed next time according to the current pilot arc current initial value based on a second timing result of the second timer.
Of course, the plasma cutting machine provided by the embodiment of the invention is not limited to the method operation described above, and the related operation in the pilot arc current control method of the plasma cutting machine provided by any embodiment of the invention can be performed.
According to the plasma cutting machine provided by the embodiment of the invention, the initial value of the pilot arc current to be used when the gun switch is pressed down is calculated in real time through software, and the proper pilot arc current can be matched in real time according to the actual application scene of a user, so that the problems that the fixed pilot arc current is small in some scene currents, discontinuous in pilot arcs, poor in arcing, large in some scene currents and heavy in damage of vulnerable parts of the cutting gun are solved.
Example IV
A fourth embodiment of the present invention also provides a storage medium containing computer-executable instructions for performing a method of controlling pilot arc current of a plasma cutter, when executed by a computer processor, the method comprising:
when the gun switch is detected to be pressed, starting an arc according to the current initial value control of the pilot arc current, and starting to detect the pilot arc current;
when the pilot arc current is detected, starting a first timer and a second timer respectively to start timing, and starting to detect the cutting arc current;
if the arc starting is judged to be successful based on the detected cutting arc current, controlling the first timer to stop timing, and determining a target initial pilot arc current value used when a gun switch is pressed next time based on a first timing result of the first timer according to the current initial pilot arc current value;
and if abnormal arc interruption is judged based on the detected cutting arc current and pilot arc current, controlling the second timer to stop timing, and determining a target pilot arc current initial value used when a gun switch is pressed next time according to the current pilot arc current initial value based on a second timing result of the second timer.
The storage medium may be any of various types of memory devices or storage devices. The term "storage medium" is intended to include: mounting media such as CD-ROM, floppy disk or tape devices; computer system memory or random access memory such as DRAM, DDR RAM, SRAM, EDO RAM, lanbus (Rambus) RAM, etc.; nonvolatile memory such as flash memory, magnetic media (e.g., hard disk or optical storage); registers or other similar types of memory elements, etc. The storage medium may also include other types of memory or combinations thereof. In addition, the storage medium may be located in a computer system in which the program is executed, or may be located in a different second computer system connected to the computer system through a network (such as the internet). The second computer system may provide program instructions to the computer for execution. The term "storage medium" may include two or more storage media that may reside in different locations (e.g., in different computer systems connected by a network). The storage medium may store program instructions (e.g., embodied as a computer program) executable by one or more processors.
Of course, the storage medium containing the computer executable instructions provided in the embodiments of the present invention is not limited to the method operations described above, and may also perform the related operations in the method for controlling the pilot arc current of the plasma cutting machine provided in any embodiment of the present invention.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
From the above description of embodiments, it will be clear to a person skilled in the art that the present invention may be implemented by means of software and necessary general purpose hardware, but of course also by means of hardware, although in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, etc., and include several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments of the present invention.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. A pilot arc current control method for a plasma cutting machine, comprising:
when the gun switch is detected to be pressed, starting an arc according to the current initial value control of the pilot arc current, and starting to detect the pilot arc current;
when the pilot arc current is detected, starting a first timer and a second timer respectively to start timing, and starting to detect the cutting arc current;
if the arc starting is judged to be successful based on the detected cutting arc current, controlling the first timer to stop timing, and determining a target initial pilot arc current value used when a gun switch is pressed next time based on a first timing result of the first timer according to the current initial pilot arc current value;
and if abnormal arc interruption is judged based on the detected cutting arc current and pilot arc current, controlling the second timer to stop timing, and determining a target pilot arc current initial value used when a gun switch is pressed next time according to the current pilot arc current initial value based on a second timing result of the second timer.
2. The pilot arc current control method of claim 1, further comprising, after the beginning of the detection of the cutting arc current:
if the detected cutting arc current is larger than a first current threshold value, judging that the arc starting is successful;
and if the detected cutting arc current is smaller than the first current threshold value and the detected guiding arc current is smaller than the second current threshold value, judging abnormal arc breaking.
3. The method of claim 1, wherein the determining a target pilot arc current initial value for use next time a gun switch is pressed according to the current pilot arc current initial value based on a first timing result of the first timer, comprises:
if the first timing result is smaller than a first time threshold, the target pilot arc current initial value is the difference value between the current pilot arc current initial value and a first current value, otherwise, the target pilot arc current initial value is the difference value between the current pilot arc current initial value and a second current value.
4. The pilot arc current control method of claim 1, wherein the determining a target pilot arc current initial value to be used next time a gun switch is pressed according to the current pilot arc current initial value based on a second timing result of the second timer, comprises:
and if the second timing result is smaller than a second time threshold, the target pilot arc current initial value is the sum of the current pilot arc current initial value and a third current value, otherwise, the target pilot arc current initial value is the sum of the current pilot arc current initial value and a fourth current value.
5. The method of claim 1, further comprising, after the determining, based on a first timing result of the first timer, a target pilot arc current initial value to be used when a next gun switch is pressed based on the current pilot arc current initial value, or after the determining, based on a second timing result of the second timer, a target pilot arc current initial value to be used when a next gun switch is pressed based on the current pilot arc current initial value:
and adjusting the initial value of the target pilot arc current according to the preset pilot arc current lower limit value and the preset pilot arc current upper limit value.
6. The pilot arc current control method of claim 1, wherein the controlling the striking according to the current pilot arc current initial value comprises:
and increasing the initial value of the current pilot arc current according to a preset speed.
7. The pilot arc current control method of claim 1, wherein the current pilot arc current initial value is a preset initial value if the gun switch is detected to be pressed for the first time;
the arc starting is controlled according to the initial value of the current pilot arc current, which comprises the following steps:
and controlling to start an arc by using the fixed preset initial value.
8. A pilot arc current control device for a plasma cutting machine, comprising:
the pilot arc current detection module is used for controlling to start an arc according to the initial value of the current pilot arc current when the gun switch is detected to be pressed down, and starting to detect the pilot arc current;
the cutting arc current detection module is used for starting the first timer and the second timer to start timing when the pilot arc current is detected, and starting to detect the cutting arc current;
the first target pilot arc current initial value determining module is used for controlling the first timer to stop timing if the arc starting is judged to be successful based on the detected cutting arc current, and determining a target pilot arc current initial value used when a gun switch is pressed next time based on a first timing result of the first timer according to the current pilot arc current initial value;
and the second target pilot arc current initial value determining module is used for controlling the second timer to stop timing if abnormal arc interruption is determined based on the detected cutting arc current and pilot arc current, and determining a target pilot arc current initial value used when a gun switch is pressed next time according to the current pilot arc current initial value based on a second timing result of the second timer.
9. A plasma cutting machine, comprising:
one or more processors;
a memory for storing one or more programs;
when executed by the one or more processors, causes the one or more processors to implement the pilot arc current control method of the plasma cutter of any one of claims 1-7.
10. A computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements a method of controlling pilot arc current of a plasma cutter according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311307731.6A CN117300316A (en) | 2023-10-10 | 2023-10-10 | Method and device for controlling pilot arc current of plasma cutting machine and plasma cutting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311307731.6A CN117300316A (en) | 2023-10-10 | 2023-10-10 | Method and device for controlling pilot arc current of plasma cutting machine and plasma cutting machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117300316A true CN117300316A (en) | 2023-12-29 |
Family
ID=89296923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311307731.6A Pending CN117300316A (en) | 2023-10-10 | 2023-10-10 | Method and device for controlling pilot arc current of plasma cutting machine and plasma cutting machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117300316A (en) |
-
2023
- 2023-10-10 CN CN202311307731.6A patent/CN117300316A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11253940B2 (en) | Reduced energy welding system and method | |
| US11040410B2 (en) | Welding wire preheating systems and methods | |
| US8169162B2 (en) | Abnormal discharge suppressing device for vacuum apparatus | |
| CN109047990B (en) | Control method for contact arc striking of gas metal arc welding | |
| JP2007267584A (en) | Charging device with safety circuit and charging method therefor | |
| US20170093180A1 (en) | Charger and charging method | |
| EP3507055B1 (en) | Arc stop | |
| KR100459793B1 (en) | Battery charger of mobile phone using constant voltage and pulse, and high speed charge method for the same | |
| CN117300316A (en) | Method and device for controlling pilot arc current of plasma cutting machine and plasma cutting machine | |
| WO2020108490A1 (en) | Laser and light exiting control method and apparatus therefor, and laser device | |
| EP0719613B1 (en) | Plasma cutting method and nc plasma cutting apparatus | |
| CN114871534B (en) | Argon arc welding lifting arc striking control method and device, argon arc welding machine and storage medium | |
| CN112453646B (en) | Position finding detection method and device, storage medium and electronic equipment | |
| US20210039184A1 (en) | Arc start | |
| CN104959720B (en) | Air plasma cutter sequential control method | |
| CN114540774B (en) | Power supply and arc processing method | |
| CN112398417B (en) | Working circuit protection method and device and electronic equipment | |
| CN114833428A (en) | Arc starting and closing control method, device and equipment for submerged arc welding and storage medium | |
| US20210154761A1 (en) | Method of arc welding control | |
| CN111037067B (en) | Consumable electrode short-circuit welding control method | |
| CN113927141B (en) | Arc control method, system and device | |
| CN111299771B (en) | Push-pull wire motor control method, controller, control circuit and wire feeding system | |
| JP2006116585A (en) | Consumable electrode type arc welding method | |
| JPH09163618A (en) | Battery charging method | |
| CN110548967B (en) | Welding dry elongation adjusting method and device and welding machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |