A conductive control method and device for plasma rotating electrode equipment

Abstract

The present application is about a conduction control method and device for a plasma rotating electrode device. It includes: collecting the actual current of each carbon brush circuit, when the actual current of any carbon brush circuit exceeds the preset current, it is determined that the actual current of the carbon brush circuit has an abnormal current condition; collecting the actual carbon brush pressure of each carbon brush, and judging whether the actual carbon brush pressure of each carbon brush is within the preset carbon brush pressure range; if the actual carbon brush pressure of at least one carbon brush is less than the lower limit of the preset carbon brush pressure range, and the actual carbon brush pressure of the carbon brush less than the lower limit of the preset carbon brush pressure range is recorded as the first actual carbon brush pressure, then it is determined that the first actual carbon brush pressure is not within the preset carbon brush pressure range; adjusting the first actual carbon brush pressure to within the preset carbon brush pressure range; judging whether the actual current of the carbon brush circuit with abnormal current condition has returned to normal according to the preset current. The present application can effectively control the current conduction of each carbon brush to prevent ignition and smoke.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of metal powder preparation, and in particular to a conduction control method and device for a plasma rotating electrode device. Background Art

[0002] The transferred arc plasma rotating electrode equipment forms a circuit through a plasma power supply, a plasma gun, a high-speed rotating rod, a mechanical shaft and a carbon brush to achieve the goal of conductivity. Among them, the high-speed rotating mechanical shaft and the carbon brush conduct electricity through rotational friction. Under high speed, high load and high heat conditions, the mechanical shaft is prone to fatigue damage, deformation and scrap during long-term operation. In the powder making process, excessive temperature is the main factor for deformation and damage of the mechanical shaft. Therefore, improving the operating stability of the mechanical shaft is one of the key points to improve the operating stability of the transferred arc plasma rotating electrode equipment.

[0003] Generally speaking, during the powder making process, the mechanical shaft is mainly affected by three types of heat: resistance heat caused by large current conduction, sliding friction heat between the carbon brush and the mechanical shaft, and arc discharge heat (commonly known as sparking) between the carbon brush and the mechanical shaft. Among them, arc discharge heat is the main cause of damage to the mechanical shaft in a short period of time. The main causes of arc discharge heat are two aspects: (1) poor contact between the carbon brush and the mechanical shaft; (2) excessive current conducted by the carbon brush.

[0004] In the related art, in the actual powder making process, since the resistance of each group of carbon brush circuits is different and fluctuates, the groups of carbon brushes are similar to parallel circuits, and the current conducted will fluctuate greatly. Therefore, in the actual powder making process, the current distribution between the carbon brushes is not uniform. In addition, during the powder making process, when the conducted current of each group of carbon brushes exceeds the load limit of the carbon brushes, the carbon brushes and the mechanical shaft will quickly heat up, arc, spark, and smoke. This working condition will greatly reduce the life of the mechanical shaft, and also limit the preparation of high-melting-point fine-grained refractory metal powders.

[0005] Therefore, it is necessary to improve one or more problems existing in the above-mentioned related technical solutions.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0007] The purpose of the embodiments of the present application is to provide a conduction control method and device for a plasma rotating electrode device, thereby overcoming one or more problems caused by the limitations and defects of the related art to a certain extent.

[0008] According to a first aspect of an embodiment of the present application, a method for controlling conduction of a plasma rotating electrode device is provided, the method comprising:

[0009] The actual current of each carbon brush circuit is collected, and when the actual current of any carbon brush circuit exceeds the preset current, it is determined that the carbon brush circuit of this circuit has an abnormal current condition;

[0010] Collecting the actual carbon brush pressure of each carbon brush, and determining whether the actual carbon brush pressure of each carbon brush is within a preset carbon brush pressure range; wherein the preset carbon brush pressure range includes an open interval formed between an upper limit value of the preset carbon brush pressure range and a lower limit value of the preset carbon brush pressure range;

[0011] If the actual carbon brush pressure of at least one of the carbon brushes is less than the lower limit of the preset carbon brush pressure range, and the actual carbon brush pressure of the carbon brush less than the lower limit of the preset carbon brush pressure range is recorded as the first actual carbon brush pressure, it is determined that the first actual carbon brush pressure is not within the preset carbon brush pressure range;

[0012] Adjusting the first actual carbon brush pressure to within the preset carbon brush pressure range;

[0013] Determining whether the actual current of the carbon brush circuit in which the current abnormality occurs returns to normal according to the preset current;

[0014] If the actual current of the carbon brush circuit in the abnormal current condition is less than or equal to the preset current, it is determined that the actual current of the carbon brush circuit in the abnormal current condition has returned to normal;

[0015] The plasma rotating electrode equipment performs normal powder making work.

[0016] In one embodiment of the present application, after the step of judging whether the actual current of the carbon brush circuit in which the current abnormality occurs returns to normal according to the preset current, the method includes:

[0017] If the actual current of the carbon brush circuit where the current abnormality occurs is greater than the preset current, it is determined that the actual current of the carbon brush circuit where the current abnormality occurs has not returned to normal.

[0018] In one embodiment of the present application, after the step of determining that the actual current of the carbon brush circuit in which the current abnormality occurs has not returned to normal, the method further comprises:

[0019] Collecting the actual temperature of each of the carbon brushes, and determining whether the actual temperature of each of the carbon brushes exceeds a preset temperature;

[0020] If the actual temperature of each carbon brush exceeds the preset temperature, the plasma gun stops arcing, and the carbon brushes whose actual temperature exceeds the preset temperature are cooled down, and then the corresponding carbon brushes are re-pressed to start arcing;

[0021] Continue to judge whether the actual current of the carbon brush circuit with abnormal current condition returns to normal according to the preset current.

[0022] In one embodiment of the present application, after the step of continuing to judge whether the actual current of the carbon brush circuit in which the current abnormality occurs returns to normal according to the preset current, the method includes:

[0023] If the actual current of the carbon brush circuit in the abnormal current condition is less than or equal to the preset current, it is determined that the actual current of the carbon brush circuit in the abnormal current condition has returned to normal;

[0024] The plasma rotating electrode device performs normal powder making work.

[0025] In one embodiment of the present application, after the step of continuing to judge whether the actual current of the carbon brush circuit in which the current abnormality occurs returns to normal according to the preset current, the method further includes:

[0026] If the actual current of the carbon brush circuit in the abnormal current condition is greater than the preset current, it is determined that the actual current of the carbon brush circuit in the abnormal current condition has not returned to normal;

[0027] Starting the current limiter in each carbon brush circuit to perform current limiting processing on each carbon brush circuit;

[0028] The plasma rotating electrode device performs normal powder making work.

[0029] In one embodiment of the present application, after the step of collecting the actual temperature of each of the carbon brushes and determining whether the actual temperature of each of the carbon brushes exceeds the preset temperature, the method further includes:

[0030] If the actual temperature of each carbon brush does not exceed the preset temperature, the current limiter in each carbon brush circuit is started to perform current limiting processing on each carbon brush circuit;

[0031] The plasma rotating electrode device performs normal powder making work.

[0032] In one embodiment of the present application, after the step of determining whether the actual carbon brush pressure of each carbon brush is within a preset carbon brush pressure range, the step further includes:

[0033] If the actual carbon brush pressure of at least one of the carbon brushes is greater than the upper limit of the preset carbon brush pressure range, and the actual carbon brush pressure of the carbon brush greater than the upper limit of the preset carbon brush pressure range is recorded as the second actual carbon brush pressure, it is determined that the second actual carbon brush pressure is not within the preset carbon brush pressure range;

[0034] The second actual carbon brush pressure is adjusted to be within the preset carbon brush pressure range.

[0035] In one embodiment of the present application, after the step of determining whether the actual carbon brush pressure of each carbon brush is within a preset carbon brush pressure range, the step further includes:

[0036] If the actual carbon brush pressure of at least one of the carbon brushes is greater than or equal to the lower limit value of the preset carbon brush pressure range and less than or equal to the upper limit value of the preset carbon brush pressure range, and the actual carbon brush pressure of the carbon brush that is greater than or equal to the lower limit value of the preset carbon brush pressure range and less than or equal to the upper limit value of the preset carbon brush pressure range is recorded as the third actual carbon brush pressure, then it is determined that the third actual carbon brush pressure is within the preset carbon brush pressure range;

[0037] Continue to determine whether the actual temperature of each carbon brush exceeds the preset temperature.

[0038] In one embodiment of the present application, the step of stopping the arc of the plasma gun and cooling the carbon brush whose actual temperature exceeds the preset temperature includes:

[0039] The plasma gun stops arcing, disconnects the connection between the carbon brush whose actual temperature exceeds the preset temperature and the mechanical shaft for a preset time period, and cools the actual temperature of the carbon brush that exceeds the preset temperature to below a preset cooling temperature; wherein the preset cooling temperature is lower than the preset temperature.

[0040] According to a second aspect of an embodiment of the present application, a plasma rotating electrode device is provided, wherein the device is applied to the conduction control method of the plasma rotating electrode device described in any one of the above embodiments, and the device comprises:

[0041] Electrode rod material;

[0042] A mechanical shaft, one end of the mechanical shaft close to the electrode bar is connected to the electrode bar;

[0043] A driving motor connected to one end of the mechanical shaft away from the electrode bar;

[0044] At least M carbon brushes, each of which is disposed on a peripheral wall of the mechanical shaft; wherein M is an even number;

[0045] A plasma gun, the axis center of the plasma gun is colinear with the axis center of the electrode bar material, and is used to generate a plasma arc to heat the electrode bar material;

[0046] A plasma power supply, whose positive electrode is connected to each of the carbon brushes, and whose negative electrode is connected to the plasma gun; wherein a corresponding carbon brush circuit is formed between the plasma power supply, each of the carbon brushes, the mechanical shaft, the electrode rod material and the plasma gun;

[0047] A pressure sensor is respectively arranged on each of the carbon brushes and is used to collect the actual carbon brush pressure of each of the carbon brushes;

[0048] A pressing device, connected to each of the carbon brushes, for adjusting the actual carbon brush pressure of each of the carbon brushes;

[0049] A temperature sensor is provided on each of the carbon brushes, and is used to collect the actual temperature of each of the carbon brushes;

[0050] A current sensor is provided on each carbon brush circuit, and is used to collect the actual current of each carbon brush circuit;

[0051] The current limiter is respectively arranged on each carbon brush circuit and is used for limiting the current of each carbon brush circuit.

[0052] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0053] In the embodiment of the present application, through the above method, when an abnormal current condition occurs in any carbon brush circuit, it is determined whether the actual carbon brush pressure of each carbon brush is within the preset carbon brush pressure range. When the actual carbon brush pressure of at least one carbon brush is less than the lower limit of the preset carbon brush pressure range, and the actual carbon brush pressure of the carbon brush less than the lower limit of the preset carbon brush pressure range is recorded as the first actual carbon brush pressure, it is determined that the first actual carbon brush pressure is not within the preset carbon brush pressure range. Then adjust the first actual carbon brush pressure to within the preset carbon brush pressure range. Then observe whether the actual current of the carbon brush with abnormal current condition returns to normal. If it returns to normal, perform normal powder making. Through this method, the current conduction of each carbon brush can be effectively controlled to prevent sparking and smoking, and to maximize the life and stability of the mechanical shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0055] Figure 1 A flowchart showing a method for controlling the conduction of a plasma rotating electrode device in an exemplary embodiment of the present application;

[0056] Figure 2 A schematic structural diagram of a plasma rotating electrode device in an exemplary embodiment of the present application is shown.

[0057] In the figure: 100, mechanical axis; 200, driving motor; 300, carbon brush; 400, plasma gun; 500, plasma power supply; 600, current sensor; 700, current limiter; 800, electrode rod material; 900, metal powder. DETAILED DESCRIPTION

[0058] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0059] In addition, the accompanying drawings are only schematic illustrations of the embodiments of the present application and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and their repeated descriptions will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0060] In this exemplary embodiment, a method for controlling the conduction of a plasma rotating electrode device is first provided. Figure 1 As shown in , the method includes: steps S101 to S107.

[0061] Wherein, step S101: collecting the actual current of each carbon brush circuit, when the actual current of any carbon brush circuit exceeds the preset current, it is determined that the carbon brush circuit has an abnormal current condition.

[0062] Step S102: Collect the actual carbon brush pressure of each carbon brush 300, and determine whether the actual carbon brush pressure of each carbon brush 300 is within a preset carbon brush pressure range; wherein the preset carbon brush pressure range includes an open interval formed between the upper limit value of the preset carbon brush pressure range and the lower limit value of the preset carbon brush pressure range.

[0063] Step S103: If the actual carbon brush pressure of at least one carbon brush 300 is less than the lower limit of the preset carbon brush pressure range, and the actual carbon brush pressure of the carbon brush 300 less than the lower limit of the preset carbon brush pressure range is recorded as the first actual carbon brush pressure, it is determined that the first actual carbon brush pressure is not within the preset carbon brush pressure range.

[0064] Step S104: adjusting the first actual carbon brush pressure to within a preset carbon brush pressure range.

[0065] Step S105: determining whether the actual current of the carbon brush circuit with abnormal current condition has returned to normal according to the preset current.

[0066] Step S106: If the actual current of the carbon brush circuit where the current abnormality occurs is less than or equal to the preset current, it is determined that the actual current of the carbon brush circuit where the current abnormality occurs returns to normal.

[0067] Step S107: The plasma rotating electrode equipment performs normal powder making work.

[0068] In the embodiment of the present application, through the above method, when the actual current of any carbon brush circuit has an abnormal current condition, it is determined whether the actual carbon brush pressure of each carbon brush 300 is within the preset carbon brush pressure range. When the actual carbon brush pressure of at least one carbon brush 300 is less than the lower limit of the preset carbon brush pressure range, and the actual carbon brush pressure of the carbon brush 300 that is less than the lower limit of the preset carbon brush pressure range is recorded as the first actual carbon brush pressure, it is determined that the first actual carbon brush pressure is not within the preset carbon brush pressure range. Then adjust the first actual carbon brush pressure to within the preset carbon brush pressure range. Then observe whether the actual current of the carbon brush 300 with the abnormal current condition returns to normal. If it returns to normal, perform normal powder making. Through this method, the current conduction of each carbon brush 300 can be effectively controlled to prevent sparking and smoking, and to maximize the life and stability of the mechanical axis 100.

[0069] In order to better explain the conduction control method of the plasma rotating electrode device, the present application introduces the plasma rotating electrode device.

[0070] refer to Figure 2 The plasma rotating electrode device of the present application includes an electrode bar 800, a mechanical shaft 100, a driving motor 200, at least M carbon brushes 300, a plasma gun 400 and a plasma power supply 500. Among them, one end of the mechanical shaft 100 close to the electrode bar 800 is connected to the electrode bar 800. The driving motor 200 is connected to one end of the mechanical shaft 100 away from the electrode bar 800. Each carbon brush 300 is respectively arranged on the peripheral wall of the mechanical shaft 100. The axis center of the plasma gun 400 is colinear with the axis center of the electrode bar 800, which is used to generate a plasma arc to heat the electrode bar 800. The positive pole of the plasma power supply 500 is connected to each carbon brush 300, and the negative pole of the plasma power supply 500 is connected to the plasma gun 400. Therefore, a corresponding carbon brush circuit is formed between the plasma power supply 500, each carbon brush 300, the mechanical shaft 100, the electrode bar 800 and the plasma gun 400. It should be noted that the number M of the carbon brushes 300 is an even number such as 2, 4, 6 or 8, and the number of carbon brushes 300 determines the number of carbon brush circuits that can be formed.

[0071] In addition, the plasma rotating electrode device also includes a pressure sensor, a clamping device, a temperature sensor, a current sensor 600 and a current limiter 700. Among them, the pressure sensor is respectively arranged on each carbon brush 300, and is used to collect the actual carbon brush pressure of each carbon brush 300. The clamping device is connected to each carbon brush 300, and is used to adjust the actual carbon brush pressure of each carbon brush 300. The temperature sensor is respectively arranged on each carbon brush 300, and is used to collect the actual temperature of each carbon brush 300. The current sensor 600 is respectively arranged on each carbon brush circuit, and is used to collect the actual current of each carbon brush circuit. The current limiter 700 is respectively arranged on each carbon brush circuit, and is used to limit the current of each carbon brush circuit. Among them, the clamping device can be understood with reference to the prior art, and this application will not elaborate on it.

[0072] The driving motor 200 is used to drive the electrode bar 800 to rotate at a high speed. The plasma arc generated by the plasma gun 400 heats the rotating electrode bar 800 to form metal powder 900, thereby achieving powdering of the electrode bar 800.

[0073] Next, we will refer to Figure 1 and Figure 2 , each part of the above-mentioned conduction control method of the plasma rotating electrode device in this example embodiment is described in more detail.

[0074] In step S101, the current sensor 600 in each carbon brush circuit collects the actual current in the carbon brush circuit where it is located, and then determines whether any carbon brush circuit has an abnormal current condition based on the preset current. Specifically, when the actual current of any carbon brush circuit exceeds the preset current, it is determined that the carbon brush circuit has an abnormal current condition. Among them, the preset current can be set according to the actual situation, and this application does not limit this.

[0075] It is understandable that, assuming that the output current of the plasma power supply 500 is 1600A, when there are 4 carbon brushes 300, it means that there are 4 carbon brush circuits, assuming that the preset current is 600A. When the actual current of each carbon brush circuit does not exceed 600A, there is no abnormal current condition in the carbon brush circuit. However, when the actual current of any carbon brush circuit is greater than 600A, an abnormal current condition occurs in any carbon brush circuit. Among them, the output current of the plasma power supply 500, the number of carbon brushes 300 and the preset current assumed in this application can all be set according to actual conditions, and this application does not impose any restrictions on this.

[0076] It should be noted that the carbon brush circuit with abnormal current may have one, two or three circuits, depending on the actual situation, and this application does not impose any restrictions on this.

[0077] In step S102, the carbon brush 300 in each carbon brush circuit has a different degree of fit and compression with the mechanical shaft 100, resulting in different resistance values ​​of the carbon brush circuit. Specifically, if the actual carbon brush pressure of the carbon brush 300 is too low, the contact between the carbon brush 300 and the mechanical shaft 100 will be poor, which will increase the resistance value of the carbon brush circuit, and the actual current of the corresponding carbon brush circuit will become smaller; if the actual carbon brush pressure is too high, it is easy to cause the carbon brush 300 and the mechanical shaft 100 to generate increased heat due to friction, and the carbon brush 300 will increase wear and temperature, which will increase the resistance value of the carbon brush circuit, and the actual current of the corresponding carbon brush circuit will also become smaller.

[0078] Therefore, when the actual current of the carbon brush circuit is abnormal, it is first determined whether the current conduction change is caused by the different degrees of fit and compression between the carbon brush 300 and the mechanical shaft 100, specifically, whether the actual carbon brush pressure of each carbon brush circuit is within the preset carbon brush pressure range. The actual carbon brush pressure is collected by the pressure sensor on each carbon brush 300.

[0079] In step S103, if the actual carbon brush pressure of the carbon brush 300 is less than the lower limit of the preset carbon brush pressure range, and the actual carbon brush pressure of the carbon brush 300 less than the lower limit of the preset carbon brush pressure range is recorded as the first actual carbon brush pressure, it is determined that the first actual carbon brush pressure is not within the preset carbon brush pressure range.

[0080] In one example, the preset carbon brush pressure range is 30-35N, the lower limit value of the preset carbon brush pressure range is 30N, and the upper limit value of the preset carbon brush pressure range is 35N.

[0081] In step S104, when the actual carbon brush pressure of the carbon brush 300 that is less than the lower limit of the preset carbon brush pressure range is not within the preset carbon brush pressure range, it is necessary to adjust the first actual carbon brush pressure to within the preset carbon brush pressure range. Since the preset carbon brush pressure range includes an open interval formed between the upper limit of the preset carbon brush pressure range and the lower limit of the preset carbon brush pressure range, it is necessary to adjust the first actual carbon brush pressure to a value greater than or equal to the lower limit of the preset carbon brush pressure range and less than or equal to the upper limit of the preset carbon brush pressure range.

[0082] In step S105, when the first actual carbon brush pressure is adjusted to within the preset carbon brush pressure range, it is necessary to further determine whether the actual current of the carbon brush circuit with abnormal current condition has returned to normal. Specifically, it is possible to determine whether the actual current of the carbon brush circuit with abnormal current condition has returned to normal based on the magnitude relationship between the preset current and the actual current of the carbon brush circuit with abnormal current condition.

[0083] It should be noted that there are two situations to determine whether the actual current of the carbon brush circuit with abnormal current has returned to normal:

[0084] Case a: The actual current in the carbon brush circuit where the current abnormality occurred returns to normal.

[0085] Case b: The actual current in the carbon brush circuit with abnormal current has not returned to normal.

[0086] The judgment of the ath situation is as described in step S106: when the actual current of the carbon brush circuit where the current abnormality occurs is less than or equal to the preset current, it is determined that the actual current of the carbon brush circuit where the current abnormality occurs has returned to normal.

[0087] Regarding the processing of the ath situation, as described in step S107: when the actual current of the carbon brush circuit with abnormal current condition returns to normal, the plasma rotating electrode equipment performs normal powder making work.

[0088] The judgment of the bth situation and the processing for the bth situation will be explained in the following embodiments, and this application will not go into details here.

[0089] In one embodiment, after the step of judging whether the actual current of the carbon brush circuit in which the current abnormality occurs returns to normal according to the preset current, the method includes:

[0090] If the actual current of the carbon brush circuit where the current abnormality occurs is greater than the preset current, it is determined that the actual current of the carbon brush circuit where the current abnormality occurs has not returned to normal.

[0091] It can be understood that after the first actual carbon brush pressure is adjusted to the preset carbon brush pressure range, it is determined whether the actual current of the carbon brush circuit with abnormal current condition has returned to normal. There is also a situation b: the actual current of the carbon brush circuit with abnormal current condition has not returned to normal.

[0092] Judgment of the bth situation: when the actual current of the carbon brush circuit where the current abnormality occurs is greater than the preset current, it is determined that the actual current of the carbon brush circuit where the current abnormality occurs has not returned to normal.

[0093] If the actual current of the carbon brush circuit with abnormal current still does not return to normal after the first actual carbon brush pressure is adjusted to the preset carbon brush pressure range, it means that the actual current of the carbon brush circuit with abnormal current still does not return to normal because of the actual carbon brush pressure of the carbon brush 300. At this time, it is necessary to further determine whether the actual current of the carbon brush circuit with abnormal current still does not return to normal because of the actual temperature of the carbon brush 300.

[0094] The processing for situation b is as shown in the following embodiment.

[0095] In one embodiment, after the step of determining that the actual current of the carbon brush circuit in which the current abnormality occurs has not returned to normal, the step includes:

[0096] Collecting the actual temperature of each carbon brush 300, and determining whether the actual temperature of each carbon brush 300 exceeds a preset temperature;

[0097] If the actual temperature of each carbon brush 300 exceeds the preset temperature, the plasma gun 400 stops arcing, and cools down the carbon brush 300 whose actual temperature exceeds the preset temperature, and then re-compresses the corresponding carbon brush 300 to start arcing;

[0098] Continue to judge whether the actual current of the carbon brush circuit with abnormal current condition returns to normal according to the preset current.

[0099] It is understandable that it is necessary to further determine whether the actual current of the carbon brush circuit that has abnormal current due to the actual temperature of the carbon brush 300 has not yet returned to normal, specifically by comparing the preset temperature with the actual temperature of each carbon brush 300.

[0100] If the actual temperature of each carbon brush 300 exceeds the preset temperature (i.e., if the actual temperature of each carbon brush 300 is greater than the preset temperature), it is considered that the actual temperature of the carbon brush 300 has exceeded the limit value, and arc stopping and cooling treatment is required. The specific operation of arc stopping and cooling treatment is: the plasma gun 400 stops the arc, and the carbon brush 300 whose actual temperature exceeds the preset temperature is cooled and cooled, and then the corresponding carbon brush 300 is re-pressed to start the arc. Then, the actual current of the carbon brush circuit with abnormal current condition is judged according to the preset current to determine whether it returns to normal.

[0101] It should be noted that there are two situations in which the actual current of the carbon brush circuit with abnormal current condition is judged to be restored to normal according to the preset current:

[0102] Case c: The actual current in the carbon brush circuit where the current abnormality occurred returns to normal.

[0103] Case d: The actual current in the carbon brush circuit with abnormal current has not returned to normal.

[0104] The judgment of the cth situation and the processing for the cth situation are as shown in the following embodiment.

[0105] In one embodiment, after the step of continuously judging whether the actual current of the carbon brush circuit in which the current abnormality occurs returns to normal according to the preset current, the method includes:

[0106] Judgment of the cth situation: if the actual current of the carbon brush circuit where the current abnormality occurs is less than or equal to the preset current, it is determined that the actual current of the carbon brush circuit where the current abnormality occurs has returned to normal;

[0107] Treatment for situation c: The plasma rotating electrode equipment performs normal powder making work.

[0108] The judgment on the dth situation and the processing on the dth situation are as described in the following embodiment.

[0109] In one embodiment, after the step of determining whether the actual current of the carbon brush circuit in which the current abnormality occurs returns to normal according to the preset current, the method further includes:

[0110] Judgment of the dth situation: if the actual current of the carbon brush circuit where the current abnormality occurs is greater than the preset current, it is determined that the actual current of the carbon brush circuit where the current abnormality occurs has not returned to normal;

[0111] Processing for the dth case: start the current limiter 700 in each carbon brush circuit to perform current limiting processing on each carbon brush circuit;

[0112] The plasma rotating electrode equipment performs normal powder making work.

[0113] In one embodiment, after the step of collecting the actual temperature of each carbon brush 300 and determining whether the actual temperature of each carbon brush 300 exceeds a preset temperature, the method further includes:

[0114] If the actual temperature of each carbon brush 300 does not exceed the preset temperature, the current limiter 700 in each carbon brush circuit is started to perform current limiting processing on each carbon brush circuit;

[0115] The plasma rotating electrode equipment performs normal powder making work.

[0116] It is understandable that, in the process of further determining whether the actual current of the carbon brush circuit that has abnormal current caused by the actual temperature of the carbon brush 300 has not returned to normal, if the actual temperature of each carbon brush 300 does not exceed the preset temperature (i.e., if the actual temperature of each carbon brush 300 is less than or equal to the preset temperature), it means that the abnormal current in the carbon brush circuit is not caused by the actual temperature of the carbon brush 300. Therefore, it is necessary to start the current limiter 700 to limit the current of each carbon brush circuit. The preset temperature is 200°C.

[0117] Since the two main reasons for the abnormal current in the carbon brush circuit have been ruled out: the abnormal current in the carbon brush circuit caused by the actual carbon brush pressure of the carbon brush 300, and the abnormal current in the carbon brush circuit caused by the actual temperature of the carbon brush 300, it can be considered that the secondary reasons for the abnormal current in the carbon brush circuit may be: defects in the carbon brush 300, damage defects on the surface of the mechanical shaft 100, etc.

[0118] When the carbon brush 300 is defective, the contact area between the carbon brush 300 and the mechanical shaft 100 is reduced, resulting in abnormal current in the carbon brush circuit. In addition, when the surface of the mechanical shaft 100 is damaged, it will also cause poor conductive contact, resulting in abnormal current in the carbon brush circuit.

[0119] Therefore, when the current limiter 700 is started to limit the current of each carbon brush circuit, and after the powder making is completed, the carbon brush 300 and the mechanical shaft 100 need to be inspected and repaired.

[0120] It should be emphasized that the carbon brush circuit composed of each carbon brush 300 and the mechanical shaft 100 of the present application is as follows: Figure 2 In the parallel circuit shown, the purpose of starting the current limiter 700 is to evenly adjust and distribute the actual current passing through each carbon brush circuit to prevent overcurrent. The sum of the actual current passing through each carbon brush circuit (i.e., the total current actually passing through the plasma gun 400) will not change due to the current limiting of the starting current limiter 700.

[0121] In one embodiment, after the step of determining whether the actual carbon brush pressure of each carbon brush 300 is within a preset carbon brush pressure range, the method further includes:

[0122] If the actual carbon brush pressure of at least one carbon brush 300 is greater than the upper limit of the preset carbon brush pressure range, and the actual carbon brush pressure of the carbon brush 300 greater than the upper limit of the preset carbon brush pressure range is recorded as the second actual carbon brush pressure, it is determined that the second actual carbon brush pressure is not within the preset carbon brush pressure range;

[0123] The second actual carbon brush pressure is adjusted to be within a preset carbon brush pressure range.

[0124] It is understandable that when the actual carbon brush pressure of the carbon brush 300 is greater than the upper limit of the preset carbon brush pressure range, it proves that the second actual carbon brush pressure is not within the preset carbon brush pressure range. At this time, the second actual carbon brush pressure needs to be adjusted to the preset carbon brush pressure range.

[0125] Then, the actual current of the carbon brush circuit with abnormal current is judged according to the preset current whether it returns to normal. The specific process of judging whether the actual current of the carbon brush circuit with abnormal current returns to normal has been described in the above embodiment, and this application will not repeat it.

[0126] In one embodiment, after the step of determining whether the actual carbon brush pressure of each carbon brush 300 is within a preset carbon brush pressure range, the method further includes:

[0127] If the actual carbon brush pressure of at least one carbon brush 300 is greater than or equal to the lower limit value of the preset carbon brush pressure range and less than or equal to the upper limit value of the preset carbon brush pressure range, and the actual carbon brush pressure of the carbon brush 300 that is greater than or equal to the lower limit value of the preset carbon brush pressure range and less than or equal to the upper limit value of the preset carbon brush pressure range is recorded as the third actual carbon brush pressure, then it is determined that the third actual carbon brush pressure is within the preset carbon brush pressure range;

[0128] It is continued to be determined whether the actual temperature of each carbon brush 300 exceeds the preset temperature.

[0129] It is understandable that when the third actual carbon brush pressure is within the preset carbon brush pressure range, it means that the cause of the abnormal current in the carbon brush circuit is irrelevant to the actual carbon brush pressure of the carbon brush 300. At this time, it is necessary to continue to determine whether the actual temperature of the carbon brush 300 exceeds the preset temperature.

[0130] It should be noted that continuing to determine whether the actual temperature of the carbon brush 300 exceeds the preset temperature has been described in the above embodiments, and this application will not elaborate on this.

[0131] In one embodiment, the step of stopping the arc of the plasma gun 400 and cooling the carbon brush 300 whose actual temperature exceeds the preset temperature includes:

[0132] The plasma gun 400 stops arcing, disconnects the carbon brush 300 whose actual temperature exceeds the preset temperature from the mechanical shaft 100 for a preset time period, and cools the actual temperature of the carbon brush 300 that exceeds the preset temperature to below the preset cooling temperature; wherein the preset cooling temperature is lower than the preset temperature.

[0133] It is understandable that the preset time period is 1 minute, the preset cooling temperature is 100°, and within the preset time period of 1 minute, the actual temperature of the carbon brush 300 exceeding the preset temperature is cooled to below 100° C., thereby achieving rapid cooling of the carbon brush 300 .

[0134] After cooling, the corresponding carbon brush 300 is re-tightened to start the arc, and then the actual current of the carbon brush circuit with abnormal current condition is judged according to the preset current to determine whether it returns to normal.

[0135] It should be noted that the specific process of continuing to judge whether the actual current of the carbon brush circuit with abnormal current condition returns to normal according to the preset current has been described in the above embodiments, and this application will not elaborate on it.

[0136] This exemplary embodiment also provides a plasma rotating electrode device, which is applied to the conduction control method of the plasma rotating electrode device in any of the above embodiments. Figure 2As shown, the device includes: an electrode bar 800, a mechanical shaft 100, a driving motor 200, at least M carbon brushes 300, a plasma gun 400, a plasma power supply 500, a pressure sensor, a clamping device, a temperature sensor, a current sensor 600 and a current limiter 700. Among them, the mechanical shaft 100, one end of the mechanical shaft 100 close to the electrode bar 800 is connected to the electrode bar 800. The driving motor 200 is connected to one end of the mechanical shaft 100 away from the electrode bar 800. At least M carbon brushes 300, each carbon brush 300 is respectively arranged on the peripheral wall of the mechanical shaft 100; wherein M is an even number. The plasma gun 400, the axis center of the plasma gun 400 is colinear with the axis center of the electrode bar 800, and is used to generate a plasma arc to heat the electrode bar 800. A plasma power supply 500, whose positive electrode is connected to each carbon brush 300, and whose negative electrode is connected to the plasma gun 400; wherein a corresponding carbon brush circuit is formed between the plasma power supply 500, each carbon brush 300, the mechanical shaft 100, the electrode rod 800 and the plasma gun 400. A pressure sensor is respectively arranged on each carbon brush 300, and is used to collect the actual carbon brush pressure of each carbon brush 300. A clamping device is connected to each carbon brush 300, and is used to adjust the actual carbon brush pressure of each carbon brush 300. A temperature sensor is respectively arranged on each carbon brush 300, and is used to collect the actual temperature of each carbon brush 300. A current sensor 600 is respectively arranged on each carbon brush circuit, and is used to collect the actual current of each carbon brush circuit. A current limiter 700 is respectively arranged on each carbon brush circuit, and is used to limit the current of each carbon brush circuit.

[0137] It should be noted that the plasma rotating electrode device of the present application has been described in the above-mentioned conduction control method of the plasma rotating electrode device, and the present application will not elaborate on this.

[0138] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0139] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not disclosed in the present application.

Claims

1. A method for controlling the conduction of a plasma rotating electrode device, characterized in that: The method includes: The actual current of each carbon brush circuit is collected, and when the actual current of any carbon brush circuit exceeds the preset current, it is determined that the carbon brush circuit of this circuit has an abnormal current condition; Collecting the actual carbon brush pressure of each carbon brush, and determining whether the actual carbon brush pressure of each carbon brush is within a preset carbon brush pressure range; wherein the preset carbon brush pressure range includes an open interval formed between an upper limit value of the preset carbon brush pressure range and a lower limit value of the preset carbon brush pressure range; If the actual carbon brush pressure of at least one of the carbon brushes is less than the lower limit of the preset carbon brush pressure range, and the actual carbon brush pressure of the carbon brush less than the lower limit of the preset carbon brush pressure range is recorded as the first actual carbon brush pressure, it is determined that the first actual carbon brush pressure is not within the preset carbon brush pressure range; Adjusting the first actual carbon brush pressure to within the preset carbon brush pressure range; Determining whether the actual current of the carbon brush circuit in which the current abnormality occurs returns to normal according to the preset current; If the actual current of the carbon brush circuit in the abnormal current condition is less than or equal to the preset current, it is determined that the actual current of the carbon brush circuit in the abnormal current condition has returned to normal; The plasma rotating electrode equipment performs normal powder making work; Wherein, after the step of judging whether the actual current of the carbon brush circuit with abnormal current condition returns to normal according to the preset current, the method further comprises: If the actual current of the carbon brush circuit in the abnormal current condition is greater than the preset current, it is determined that the actual current of the carbon brush circuit in the abnormal current condition has not returned to normal; After the step of determining that the actual current of the carbon brush circuit in which the current abnormality occurs has not returned to normal, the method includes: Collecting the actual temperature of each of the carbon brushes, and determining whether the actual temperature of each of the carbon brushes exceeds a preset temperature; If the actual temperature of each carbon brush exceeds the preset temperature, the plasma gun stops arcing, and the carbon brushes whose actual temperature exceeds the preset temperature are cooled down, and then the corresponding carbon brushes are re-pressed to start arcing; Continue to judge whether the actual current of the carbon brush circuit with abnormal current condition returns to normal according to the preset current.

2. The conduction control method of the plasma rotating electrode device according to claim 1, characterized in that: After the step of continuing to judge whether the actual current of the carbon brush circuit with abnormal current condition returns to normal according to the preset current, the method includes: If the actual current of the carbon brush circuit in the abnormal current condition is less than or equal to the preset current, it is determined that the actual current of the carbon brush circuit in the abnormal current condition has returned to normal; The plasma rotating electrode device performs normal powder making work.

3. The conduction control method of the plasma rotating electrode device according to claim 1, characterized in that: After the step of continuing to judge whether the actual current of the carbon brush circuit with abnormal current condition returns to normal according to the preset current, the method further includes: If the actual current of the carbon brush circuit in the abnormal current condition is greater than the preset current, it is determined that the actual current of the carbon brush circuit in the abnormal current condition has not returned to normal; Starting the current limiter in each carbon brush circuit to perform current limiting processing on each carbon brush circuit; The plasma rotating electrode device performs normal powder making work.

4. The conduction control method of the plasma rotating electrode device according to claim 1, characterized in that: After the step of collecting the actual temperature of each carbon brush and determining whether the actual temperature of each carbon brush exceeds the preset temperature, the method further includes: If the actual temperature of each carbon brush does not exceed the preset temperature, the current limiter in each carbon brush circuit is started to perform current limiting processing on each carbon brush circuit; The plasma rotating electrode device performs normal powder making work.

5. The conduction control method of the plasma rotating electrode device according to claim 1, characterized in that: After the step of determining whether the actual carbon brush pressure of each carbon brush is within a preset carbon brush pressure range, the method further includes: If the actual carbon brush pressure of at least one of the carbon brushes is greater than the upper limit of the preset carbon brush pressure range, and the actual carbon brush pressure of the carbon brush greater than the upper limit of the preset carbon brush pressure range is recorded as the second actual carbon brush pressure, it is determined that the second actual carbon brush pressure is not within the preset carbon brush pressure range; The second actual carbon brush pressure is adjusted to be within the preset carbon brush pressure range.

6. The conduction control method of the plasma rotating electrode device according to claim 1, characterized in that: After the step of determining whether the actual carbon brush pressure of each carbon brush is within a preset carbon brush pressure range, the method further includes: If the actual carbon brush pressure of at least one of the carbon brushes is greater than or equal to the lower limit value of the preset carbon brush pressure range and less than or equal to the upper limit value of the preset carbon brush pressure range, and the actual carbon brush pressure of the carbon brush that is greater than or equal to the lower limit value of the preset carbon brush pressure range and less than or equal to the upper limit value of the preset carbon brush pressure range is recorded as the third actual carbon brush pressure, then it is determined that the third actual carbon brush pressure is within the preset carbon brush pressure range; Continue to determine whether the actual temperature of each carbon brush exceeds the preset temperature.

7. The conduction control method of the plasma rotating electrode device according to claim 1, characterized in that: The step of stopping the arc of the plasma gun and cooling the carbon brush whose actual temperature exceeds the preset temperature comprises: The plasma gun stops arcing, disconnects the connection between the carbon brush whose actual temperature exceeds the preset temperature and the mechanical shaft for a preset time period, and cools the actual temperature of the carbon brush that exceeds the preset temperature to below a preset cooling temperature; wherein the preset cooling temperature is lower than the preset temperature.

8. A plasma rotating electrode device, characterized in that: The device is applied to the conduction control method of the plasma rotating electrode device according to any one of claims 1 to 7, and the device comprises: Electrode rod material; A mechanical shaft, one end of the mechanical shaft close to the electrode bar is connected to the electrode bar; A driving motor connected to one end of the mechanical shaft away from the electrode bar; At least M carbon brushes, each of which is disposed on a peripheral wall of the mechanical shaft; wherein M is an even number; A plasma gun, the axis center of the plasma gun is colinear with the axis center of the electrode bar material, and is used to generate a plasma arc to heat the electrode bar material; A plasma power supply, whose positive electrode is connected to each of the carbon brushes, and whose negative electrode is connected to the plasma gun; wherein a corresponding carbon brush circuit is formed between the plasma power supply, each of the carbon brushes, the mechanical shaft, the electrode rod material and the plasma gun; A pressure sensor is respectively arranged on each of the carbon brushes and is used to collect the actual carbon brush pressure of each of the carbon brushes; A pressing device, connected to each of the carbon brushes, for adjusting the actual carbon brush pressure of each of the carbon brushes; A temperature sensor is provided on each of the carbon brushes, and is used to collect the actual temperature of each of the carbon brushes; A current sensor is provided on each carbon brush circuit, and is used to collect the actual current of each carbon brush circuit; The current limiter is respectively arranged on each carbon brush circuit and is used for limiting the current of each carbon brush circuit.

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