Welding machine cooling method, system, welding machine system and computer storage medium

Abstract

The embodiments of the present disclosure provide a welding machine cooling method, system, welding machine system and computer storage medium. The welding machine cooling method is applied to a control unit of a welding machine cooling system, and the welding cooling system also includes a cooling unit, a heating unit and a first cooling medium. The welding machine cooling method includes: controlling the cooling unit to cool the first cooling medium heated to a first temperature after passing through the welding machine, so that the first cooling medium is cooled to a second temperature when output from the cooling unit, wherein the second temperature is less than or equal to the first target temperature; controlling the heating unit to heat the first cooling medium at the second temperature according to the second temperature, so that the temperature of the first cooling medium reaches a third temperature when output from the heating unit, wherein the first cooling medium at the third temperature is used to cool the welding machine when passing through the welding machine, and the absolute value of the difference between the third temperature and the first target temperature is less than a first preset threshold value.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the technical field of welding machines, and in particular to a welding machine cooling method and system, a welding machine system and a computer storage medium. Background Art

[0002] Welding machines (such as laser welding machines, etc.) are often used for welding work. The temperature of their welding parts (such as laser welding heads) is relatively high during operation. After the welding machine has been working for a period of time, the temperature of the welding machine body will also increase, which may affect the normal operation of the welding machine. Therefore, a cooling system is generally used to cool the welding machine, but the temperature of the welding machine body must be maintained within a suitable range. Too high or too low a temperature will affect the normal operation of the welding machine.

[0003] In the related art, since the cooling system has a large hysteresis when cooling the welding machine, the cooling accuracy of the cooling system for the welding machine is low, and it is difficult to meet the demand for cooling the welding machine. Summary of the invention

[0004] The embodiments of the present disclosure provide a welding machine cooling method, system, welding machine system and computer storage medium to at least partially solve the above problems.

[0005] According to one aspect of the embodiments of the present disclosure, the embodiments of the present disclosure provide a welding machine cooling method, which is applied to a control unit of a welding machine cooling system, wherein the welding cooling system further includes a cooling unit, a heating unit and a first cooling medium, and the method includes:

[0006] Controlling the cooling unit to cool the first cooling medium heated to the first temperature after passing through the welding machine, so that the first cooling medium is cooled to a second temperature when output from the cooling unit, wherein the second temperature is less than or equal to the first target temperature;

[0007] The heating unit is controlled to heat the first cooling medium at the second temperature according to the second temperature so that the temperature of the first cooling medium reaches a third temperature when it is output from the heating unit, wherein the first cooling medium at the third temperature is used to cool the welder when passing through the welder, and the absolute value of the difference between the third temperature and the first target temperature is less than a first preset threshold value.

[0008] In some optional embodiments, the cooling unit is configured with a preset cooling target temperature, which is the first target temperature minus a second preset threshold value; the cooling unit is controlled to cool the first cooling medium that is heated to the first temperature after passing through the welding machine, including: determining the first output of the cooling unit based on the first temperature, the cooling target temperature, and the first working characteristic information of the cooling unit, wherein the first working characteristic information is used to indicate the correspondence between the output of the cooling unit and the first temperature change before and after the cooling unit cools the first cooling medium; controlling the cooling unit to cool the first cooling medium with a first output power corresponding to the first output.

[0009] In some optional embodiments, the first operating characteristic information includes: a first characteristic curve showing how the first temperature change varies with the output of the cooling unit; determining the first output of the cooling unit based on the first temperature, the cooling target temperature, and the first operating characteristic information of the cooling unit includes: determining a first difference between the cooling target temperature and the first temperature; determining the first target output from the first characteristic curve based on the first difference; using the first temperature as an input, the cooling target temperature as a target, and the first target output as a feedforward input, and determining the first output using a preset first PID algorithm.

[0010] In some optional embodiments, a first flow rate of the first cooling medium in the cooling unit is constant, and / or a second flow rate of the first cooling medium in the heating unit is constant.

[0011] In some optional embodiments, controlling the heating unit to heat the first cooling medium at the second temperature according to the second temperature includes: determining the second output of the heating unit according to the second temperature, the first target temperature, and second operating characteristic information of the heating unit, wherein the second operating characteristic information is used to indicate the correspondence between the output of the heating unit and the second temperature change before and after the heating unit heats the first cooling medium; controlling the heating unit to heat the first cooling medium with a second output power corresponding to the second output.

[0012] In some optional embodiments, the first operating characteristic information includes: a second characteristic curve showing how the second temperature change varies with the output of the heating unit; determining the second output of the heating unit based on the second temperature, the first target temperature, and the second operating characteristic information of the heating unit includes: determining a second difference between the first target temperature and the second temperature; determining the second target output from the second characteristic curve based on the second difference; using the second temperature as input, the first target temperature as target, and the second target output as feedforward input, and determining the second output using a preset second PID algorithm.

[0013] In some optional embodiments, the cooling unit includes: a cooler, a heat exchanger and a second cooling medium, the heat exchanger includes a first pipeline and a second pipeline; the heating unit is connected to the first pipeline, the first cooling medium is heated to a first temperature after passing through the welding machine and is input into the first pipeline; the cooler is connected to the second pipeline, the second cooling medium is cooled to a fourth temperature after passing through the cooler, and the second cooling medium at the fourth temperature is input into the second pipeline, wherein the fourth temperature is lower than the first temperature; the first cooling medium at the first temperature completes heat exchange with the second cooling medium at the fourth temperature in the heat exchanger, so that the first cooling medium is cooled to the second temperature when output from the heat exchanger.

[0014] According to another aspect of the embodiment of the present disclosure, a welding machine cooling system is provided, including: a cooling unit, a heating unit, a first cooling medium and a control unit; the control unit is used to control the cooling unit to cool the first cooling medium that is heated to a first temperature after passing through the welding machine, so that the first cooling medium is cooled to a second temperature when it is output from the cooling unit, wherein the second temperature is less than or equal to a first target temperature; the control unit is also used to control the heating unit to heat the first cooling medium at the second temperature according to the second temperature, so that the temperature of the first cooling medium reaches a third temperature when it is output from the heating unit, wherein the first cooling medium at the third temperature is used to cool the welding machine when passing through the welding machine, and the absolute value of the difference between the third temperature and the first target temperature is less than a first preset threshold value.

[0015] In some optional embodiments, the welding machine cooling system further includes: a first collector, a second collector and a third collector; respectively used to collect the temperature of the first cooling medium at different positions, wherein the first collector is arranged at the inlet of the cooling unit, the second collector is arranged at the outlet of the cooling unit, and the third collector is arranged at the outlet of the heating unit.

[0016] According to yet another aspect of the embodiments of the present disclosure, the embodiments of the present disclosure provide a welding machine system, including: a welding machine, and a welding machine cooling system as described in any one of the foregoing items.

[0017] According to another aspect of the embodiments of the present disclosure, the embodiments of the present disclosure provide a computer storage medium, wherein the computer storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute any of the aforementioned welding machine cooling methods.

[0018] In the welding machine cooling scheme of the embodiment of the present disclosure, when cooling the welding machine, the control unit can control the cooling unit to cool the first cooling medium heated to the first temperature after passing through the welding machine, so that the first cooling medium is cooled to the second temperature when it is output from the cooling unit, wherein the second temperature is less than or equal to the first target temperature, and the control unit can also control the heating unit to heat the first cooling medium at the second temperature according to the second temperature, so that the temperature of the first cooling medium reaches the third temperature when it is output from the heating unit, wherein the first cooling medium at the third temperature is used to cool the welding machine when passing through the welding machine, and the absolute value of the difference between the third temperature and the first target temperature is less than the first preset threshold value. Therefore, the welding machine cooling method in the embodiment of the present disclosure no longer only uses the cooling system to cool the welding machine, but combines the cooling unit and the heating unit to facilitate the coarse adjustment of the temperature of the first cooling medium by the cooling unit, and the fine adjustment of the temperature of the first cooling medium by the heating unit to a reasonable temperature range, and then uses the first cooling medium to cool the welding machine, so that the problem of low cooling accuracy of the welding machine caused by the large hysteresis of the cooling system when cooling the welding machine can be effectively avoided, thereby better meeting the demand for cooling the welding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following drawings are only intended to illustrate and explain the present disclosure, and are not intended to limit the scope of the present disclosure.

[0020] Figure 1 A schematic diagram of an optional welding machine cooling system according to an embodiment of the present disclosure is shown.

[0021] Figure 2 A flow chart of an optional welding machine cooling method according to an embodiment of the present disclosure is shown.

[0022] Figure 3 A schematic diagram of another optional welding machine cooling system according to an embodiment of the present disclosure is shown.

[0023] Figure 4 An optional sub-step flowchart of step S102 of “controlling the cooling unit to cool the first cooling medium heated to the first temperature after passing through the welding machine” according to an embodiment of the present disclosure is shown.

[0024] Figure 5 An optional sub-step flowchart of step S1021 according to an embodiment of the present disclosure is shown.

[0025] Figure 6 An optional sub-step flowchart of step S104 of “controlling the heating unit to heat the first cooling medium at the second temperature according to the second temperature” according to an embodiment of the present disclosure is shown.

[0026] Figure 7 An optional sub-step flowchart of step S1041 according to an embodiment of the present disclosure is shown.

[0027] Description of reference numerals:

[0028] 10. Cooling unit; 20. Heating unit; 30. Control unit; 40. Welding machine; 51. First collector; 52. Second collector; 53. Third collector; 11. Cooler; 12. Heat exchanger; 121. First pipeline; 122. Second pipeline. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. All other embodiments obtained by ordinary technicians in the field based on the embodiments in the embodiments of the present disclosure should fall within the scope of protection of the embodiments of the present disclosure.

[0030] Welding machines (such as laser welders, etc.) are often used for welding work. The temperature of their welding parts (such as laser welding heads) is relatively high during operation. After the welder has been working for a period of time, the temperature of the welder body will often rise, which can easily affect the normal operation of the welder. Therefore, a cooling system is generally used to cool the welder, but the temperature of the welder body must be maintained within a suitable range. Too high or too low a temperature will affect the normal operation of the welder. In the related art, since the cooling system has a large lag when cooling the welder, the cooling accuracy of the cooling system for cooling the welder is low, and it is difficult to meet the demand for cooling the welder.

[0031] In view of this, according to one aspect of the embodiments of the present disclosure, referring to Figure 1, provides a welding machine cooling system, which can at least partially solve the above technical problems, and the welding machine cooling system includes: a cooling unit 10, a heating unit 20, a first cooling medium and a control unit 30; the control unit 30 is used to control the cooling unit 10 to cool the first cooling medium that has been heated to a first temperature after passing through a welding machine 40, so that the first cooling medium is cooled to a second temperature when it is output from the cooling unit 10, wherein the second temperature is less than or equal to the first target temperature; the control unit 30 is also used to control the heating unit 20 to heat the first cooling medium at the second temperature according to the second temperature, so that the temperature of the first cooling medium reaches a third temperature when it is output from the heating unit 20, wherein the first cooling medium at the third temperature is used to cool the welding machine 40 when passing through the welding machine 40, and the absolute value of the difference between the third temperature and the first target temperature is less than a first preset threshold value.

[0032] In the welding machine cooling system of the embodiment of the present disclosure, when cooling the welding machine, the control unit can control the cooling unit to cool the first cooling medium heated to the first temperature after passing through the welding machine, so that the first cooling medium is cooled to the second temperature when output from the cooling unit, wherein the second temperature is less than or equal to the first target temperature, and the control unit can also control the heating unit to heat the first cooling medium at the second temperature according to the second temperature, so that the first cooling medium is heated to the third temperature when output from the heating unit, wherein the first cooling medium at the third temperature is used to cool the welding machine when passing through the welding machine, and the absolute value of the difference between the third temperature and the first target temperature is less than the first preset threshold value. Therefore, the welding machine cooling system in the embodiment of the present disclosure no longer only uses the cooling system to cool the welding machine, but combines the cooling unit and the heating unit to facilitate the coarse adjustment of the temperature of the first cooling medium by the cooling unit, and the fine adjustment of the temperature of the first cooling medium by the heating unit to a reasonable temperature range, and then uses the first cooling medium to cool the welding machine, so that the problem of low cooling accuracy of the welding machine caused by the large hysteresis when the cooling system cools the welding machine can be effectively avoided, thereby better meeting the demand for cooling the welding machine.

[0033] In order to facilitate the description of the welding machine cooling system in the embodiment of the present disclosure, it will be exemplified below in combination with the welding machine cooling method in the embodiment of the present disclosure. It can be understood that the following description does not serve as any limitation to the embodiment of the present disclosure.

[0034] Reference Figure 2 , shows an optional flow chart of a welding machine cooling method in an embodiment of the present disclosure, the welding cooling method is applied to a control unit 30 of a welding machine cooling system, the welding cooling system also includes a cooling unit 10, a heating unit 20 and a first cooling medium, and the welding machine cooling method includes steps S102 and S104.

[0035] S102: Controlling the cooling unit to cool the first cooling medium heated to the first temperature after passing through the welding machine, so that the first cooling medium is cooled to a second temperature when output from the cooling unit, wherein the second temperature is less than or equal to the first target temperature.

[0036] In the embodiment of the present disclosure, the control unit 30 may include one or more processing units that can be used for data processing. For example, the control unit 30 may include a PLC, a CPU, an MCU, etc. The control unit 30 may send control instructions to the cooling unit 10 to control the cooling unit 10.

[0037] In the embodiment of the present disclosure, the first cooling medium may be a liquid or gas cooling medium, and its specific type is not limited in the embodiment of the present disclosure. In the embodiment of the present disclosure, the first cooling medium is taken as cooling water (liquid) as an example. The first cooling medium mentioned in the embodiment of the present disclosure is heated after passing through the welding machine 40, which does not necessarily mean that the first cooling medium is in direct contact with the welding machine 40, but may mean that the first cooling medium exchanges heat with the welding machine 40 in the pipeline when passing near the welding machine 40 during the process of flowing along the pipeline. The first cooling medium cools the welding machine 40 in this way. During the heat exchange process, the flow of the first cooling medium may be continuous, and a constant flow rate may be maintained at all times.

[0038] In the embodiment of the present disclosure, the first cooling medium is heated to the first temperature to take away the heat of the welding machine 40. It can be understood that the value of the first temperature may be different for different situations or moments.

[0039] In order to accurately determine the temperature of the first cooling medium at different positions (for example, the first temperature and the second temperature and the third temperature below) so as to perform the welding machine cooling task based on it, the welding machine cooling system in the embodiment of the present disclosure also includes: a first collector 51, a second collector 52 and a third collector 53, which are respectively used to collect the temperature of the first cooling medium at different positions, wherein the first collector 51 is arranged at the inlet of the cooling unit 10, the second collector 52 is arranged at the outlet of the cooling unit 10, and the third collector 53 is arranged at the outlet of the heating unit 20.

[0040] Reference Figure 3 Specifically, the first cooling medium can be recycled in the welding machine cooling system of the embodiment of the present disclosure. It is input to the inlet of the cooling unit 10 through the pipeline from the position passing through the welding machine 40, output from the outlet of the cooling unit 10 through the pipeline to the inlet of the heating unit 20, and then output from the outlet of the heating unit 20 through the pipeline to the position passing through the welding machine 40, forming a cycle (for example Figure 3In the embodiment of the present disclosure, the first collector 51, the second collector 52 and the third collector 53 are respectively arranged at the inlet of the cooling unit 10, the outlet of the cooling unit 10 and the outlet of the heating unit 20, so that the first temperature, the second temperature and the third temperature can be accurately measured. It can be understood that the first collector 51, the second collector 52 and the third collector 53 can include any type of liquid temperature sensor, which is not limited here.

[0041] The structure of the cooling unit 10 in the embodiment of the present disclosure is not limited here, as long as it can cool the first cooling medium to reduce its temperature. Figure 3 A cooling unit 10 is shown, which includes: a cooler 11, a heat exchanger 12 and a second cooling medium, the heat exchanger 12 includes a first pipeline 121 and a second pipeline 122; the heating unit 20 is connected to the first pipeline 121, the first cooling medium is heated to a first temperature after passing through the welding machine 40, and is input into the first pipeline 121; the cooler 11 is connected to the second pipeline 122, the second cooling medium is cooled to a fourth temperature after passing through the cooler 11, and the second cooling medium at the fourth temperature is input into the second pipeline 122, wherein the fourth temperature is lower than the first temperature; the first cooling medium at the first temperature completes heat exchange with the second cooling medium at the fourth temperature in the heat exchanger 12, so that the first cooling medium is cooled to the second temperature when output from the heat exchanger 12. Such a structure of the cooling unit 10 can effectively cool the first cooling medium and ensure the stability of the cooling system of the welding machine.

[0042] Similar to the first cooling medium, the second cooling medium may also be a liquid or gas cooling medium, and its specific type is not limited in the embodiments of the present disclosure. In the embodiments of the present disclosure, the second cooling medium is taken as cooling water (liquid) as an example. Figure 3 As shown, when the cooler 11 is connected to the second pipeline 122, the second cooling medium can continue to flow along the pipeline to the cooler 11 after completing the heat exchange with the first cooling medium in the heat exchanger 12, and be cooled by the cooler 11 again, forming a cycle (for example Figure 3 Indicated by the arrow direction in FIG), thus forming a recycling utilization of the second cooling medium.

[0043] In the embodiment of the present disclosure, the first preset threshold value (for the sake of convenience, the first preset threshold value is denoted as A) can be reasonably set. For the welding machine cooling system in the embodiment of the present disclosure, a first target temperature (denoted as X) can be pre-set, and the ultimate goal of the welding machine cooling system is to adjust the temperature of the first cooling medium to near the first target temperature X to better cool the welding machine. The closer to the first target temperature X, the higher the temperature adjustment accuracy of the welding machine cooling system. The difference between the third temperature and the first target temperature is less than the first preset threshold value, that is, the third temperature can be located in a temperature range with the first target temperature X as the middle value (for example, it is called the target temperature range), that is, the target temperature range can be [XA, X+A], that is, X±A, and the size of A can measure the temperature adjustment accuracy of the welding machine cooling system. The smaller the temperature, the better the temperature adjustment accuracy (that is, if the accuracy of the welding machine cooling system is expected to reach ±A, the target temperature range can be [XA, X+A]). For example, if the first preset threshold value A is 0.5°C and the first target temperature X is 26°C (of course, this is just an example, and the first target temperature X can be any value between 26°C and 40°C, which is not limited here), then the target temperature range is [25.5°C, 26.5°C], that is, 26°C±0.5°C. Then the first target temperature is XA, corresponding to the above example, the first target temperature is 25.5°C. In the embodiment of the present disclosure, the demand can be met when the second temperature is less than or equal to the first target temperature.

[0044] In some optional embodiments, the resolution of the selected first collector 51, the second collector 52, and the third collector 53 is greater than or equal to one tenth of the temperature regulation accuracy of the welding machine cooling system, that is, the temperature regulation accuracy is ±A (for example, A=0.5°C), then the resolution of the first collector 51, the second collector 52, and the third collector 53 is greater than or equal to A / 10 (taking the aforementioned A=0.5°C as an example, that is, greater than 0.05°C), and the temperature change of the first cooling medium A / 10 can be identified, thereby accurately measuring the temperature of the first cooling medium at different positions.

[0045] In some optional embodiments, the cooling unit 10 is configured with a preset cooling target temperature, and the cooling target temperature is the first target temperature minus the second preset threshold value. The second preset threshold value in the embodiment of the present disclosure can be set as needed. In some optional embodiments, the second preset threshold value is the value of the temperature adjustment accuracy of the cooling unit 10.

[0046] Specifically, for different cooling units 10, the preset cooling target temperature is the target temperature when the cooling unit 10 adjusts the temperature of the first cooling medium. The cooling unit 10 also has a temperature adjustment accuracy of ±t1. For example, if t1=2.7°C, its temperature control accuracy is ±2.7°C. If the cooling target temperature for adjusting the temperature of the first cooling medium is 23.3°C, then the range in which it can adjust the first cooling medium is [20.6°C, 26°C]. Combined with the first target temperature X=26°C of the welding cooling system as a whole in the above example, since the cooling target temperature of the cooling unit 10 is 23.3°C and its temperature control accuracy is ±2.7°C, the temperature of the first cooling medium cooled by the cooling unit 10 can be stably maintained below the first target temperature X=26°C, and can be equal to the first target temperature X=26°C at most. Therefore, it is convenient for the welding machine cooling system of the embodiment of the present disclosure to use the heating unit 20 to heat the first cooling medium at the second temperature to approach the first target temperature.

[0047] In some optional embodiments, the cooling unit 10 is configured with a preset cooling target temperature, and the cooling target temperature is the first target temperature minus the second preset threshold value. Figure 4 In the flowchart in step S102, "controlling the cooling unit to cool the first cooling medium heated to the first temperature after passing through the welding machine" includes sub-steps S1021 and S1022:

[0048] S1021: Determine a first output of the cooling unit according to the first temperature, the cooling target temperature, and first operating characteristic information of the cooling unit.

[0049] The first operating characteristic information is used to indicate the corresponding relationship between the output of the cooling unit 10 and the first temperature change before and after the cooling unit 10 cools the first cooling medium.

[0050] S1022: Control the cooling unit to cool the first cooling medium with a first output power corresponding to the first output amount.

[0051] In the embodiment of the present disclosure, the first working characteristic information may be inherent working characteristic information of the cooling unit 10, which may be calibrated before being used. The first working characteristic information may be pre-stored in a storage medium connected to the control unit 30 so that the control unit 30 can call it when needed, so as to reasonably control the cooling unit 10 based on it to complete the welding machine cooling task.

[0052] The first temperature variation (denoted as ΔT1) can be calculated based on the temperature collected by the first collector (denoted as T1) and the temperature collected by the second collector (denoted as T2), that is, ΔT1=T2-T1.

[0053] When the output of the cooling unit 10 is different, the corresponding first temperature change is different. When the cooling unit 10 outputs different amounts of output, its first output power for cooling the first cooling medium is different. For example, the greater the output of the cooling unit 10, the greater the first temperature change, the greater the corresponding first output power, and the lower the second temperature to which the first cooling medium at the first temperature is cooled by the cooling unit 10. Conversely, the smaller the output of the cooling unit 10, the smaller the first temperature change, the smaller the corresponding first output power, and the higher the second temperature to which the first cooling medium at the first temperature is cooled by the cooling unit 10. It should be noted that the output of the cooling unit 10 is not necessarily linearly related to the first temperature change.

[0054] In some optional embodiments, the output of the cooling unit 10 can be expressed as a duty cycle (i.e., 0% to 100%), and different outputs correspond to different first output powers. For example, in one example, when the output of the cooling unit 10 is 100%, the first temperature change can reach 40°C, but it can be understood that this is not a limitation of the embodiments of the present disclosure.

[0055] In the embodiment of the present disclosure, the first flow rate of the first cooling medium in the cooling unit 10 is constant. According to the relationship between heat and temperature change: Q = CM (T 10 -T 20 )(where Q is heat, C is specific heat, M is mass, T 10 is the subsequent temperature, T 20 is the starting temperature), and when the mass is constant, the required heat is proportional to the change in temperature. Corresponding to the case where the first cooling medium is a liquid, the first flow rate is constant, and when the cross-sectional area of ​​the pipeline is the same, the mass of the first cooling medium cooled by the cooling unit 10 per unit time is constant. The first flow rate of the first cooling medium in the cooling unit 10 in the disclosed embodiment is constant, which enables the cooling unit 10 to more accurately adjust the temperature of the first cooling medium.

[0056] Based on the same principle, in the embodiment of the present disclosure, the second flow rate of the first cooling medium in the heating unit 20 is also constant, which enables the heating unit 20 to more accurately regulate the temperature of the first cooling medium.

[0057] In some optional embodiments, the first operating characteristic information includes: a first characteristic curve showing a change in the first temperature as a function of an output of the cooling unit 10 .

[0058] The first characteristic curve may be calibrated in advance. For example, the first characteristic curve may be a curve with the output of the cooling unit 10 as the horizontal coordinate and the first temperature change as the vertical coordinate. Given a temperature value (i.e., the first temperature change), the corresponding output can be determined therefrom. Of course, given an output, the corresponding first temperature change can also be determined therefrom. An optional example of a calibration process for the first characteristic curve will be given below.

[0059] In some optional embodiments, referring to Figure 5 In the flowchart, step S1021, namely "determining the first output of the cooling unit according to the first temperature, the first target temperature, and the first working characteristic information of the cooling unit", includes sub-steps S21, S22, and S23:

[0060] S21: Determine a first difference between the cooling target temperature and the first temperature.

[0061] Since the cooling target temperature is pre-set, after measuring the first temperature of the first cooling medium before entering the cooling unit 10 for cooling (for example, measuring the temperature of the first cooling medium at the inlet of the cooling unit 10 through the first collector 51), the cooling target temperature can be directly subtracted from the first temperature to determine the first difference.

[0062] S22: Determine a first target output amount from a first characteristic curve according to the first difference.

[0063] It can be understood that the first difference is also a temperature value, and the first difference can be used as the first temperature change amount, and the first target output amount corresponding to the first difference can be directly determined from the first characteristic curve.

[0064] When the control unit 30 controls the cooling unit 10 to cool the first cooling medium with the first output power corresponding to the first target output, the first cooling medium at the first temperature can be cooled to the cooling target temperature (ie, the second temperature is equal to the cooling target temperature) under ideal conditions.

[0065] S23: Taking the first temperature as an input quantity, the cooling target temperature as a target quantity, and the first target output quantity as a feedforward input quantity, and determining the first output quantity by using a preset first PID algorithm.

[0066] Since the actual cooling unit 10 has various interference factors when cooling the first cooling medium and cannot reach the ideal state, the preset first PID algorithm is used in the embodiment of the present disclosure to eliminate the interference factors. The P, I, and D parameter values ​​of the first PID algorithm can be reasonably set by humans or automatically updated by software, and there is no restriction here. The first target output is directly input into the first PID algorithm as a feedforward input to improve rapidity and speed up the temperature adjustment speed of the cooling unit 10.

[0067] In the embodiment of the present disclosure, the first temperature is used as the input quantity of the first PID algorithm, the cooling target temperature is used as the target quantity of the first PID algorithm, and the first target output quantity is input into the first PID algorithm as the input quantity of the feedforward control channel of the first PID algorithm. The feedforward control and the PID feedback control are combined to make the first output quantity finally determined more accurate. When the control unit 30 controls the cooling unit 10 to cool the first cooling medium with the first output power corresponding to the first output quantity, the deviation between the second temperature to which the first cooling medium at the first temperature is cooled and the cooling target temperature is smaller, thereby improving the temperature control accuracy of the cooling unit 10 to a certain extent, making it easier for the heating unit 20 to further adjust the temperature of the first cooling medium at the second temperature, and making the temperature adjustment speed faster, so as to better meet the subsequent cooling requirements of the welding machine.

[0068] After the control unit 30 controls the cooling effect of the cooling unit 10, the rough adjustment of the temperature of the first cooling medium can be completed, which is also convenient for the subsequent fine adjustment of the temperature of the first cooling medium by the heating unit 20.

[0069] S104: Controlling the heating unit according to the second temperature to heat the first cooling medium at the second temperature so that the temperature of the first cooling medium reaches a third temperature when it is output from the heating unit, wherein the first cooling medium at the third temperature is used to cool the welding machine when passing through the welding machine, and the absolute value of the difference between the third temperature and the first target temperature is less than a first preset threshold.

[0070] In the embodiment of the present disclosure, when the first cooling medium at the second temperature is input into the heating unit 20, the control unit 30 may send a control instruction to the heating unit 20 to control the heating unit 20 to heat the first cooling medium at the second temperature. It is understandable that the value of the second temperature may be different for different situations or moments. Of course, the third temperature may also be different for different situations or moments. As mentioned above, the second flow rate of the first cooling medium in the heating unit 20 may be constant, which enables the heating unit 20 to adjust the temperature of the first cooling medium more accurately.

[0071] The structure of the heating unit 20 in the embodiment of the present disclosure is not limited here, as long as it can heat the first cooling medium to increase its temperature. For example, in some exemplary embodiments, the heating unit 20 includes at least one heating wire, which effectively heats the first cooling medium through the thermal effect of the current, but this is not a limitation of the embodiment of the present disclosure.

[0072] From the foregoing, the first preset threshold in the embodiment of the present disclosure (for the sake of convenience, the first preset threshold is denoted as A) can be reasonably set. For the welding machine cooling system in the embodiment of the present disclosure, a first target temperature (denoted as X) can be set first. Then the ultimate goal of the welding machine cooling system is to adjust the temperature of the first cooling medium to near the first target temperature X to better cool the welding machine. The closer to the first target temperature X, the higher the temperature adjustment accuracy of the welding machine cooling system. The difference between the third temperature and the first target temperature is less than the first preset threshold, that is, the third temperature can be located in a temperature range with the first target temperature X as the middle value (for example, it is called the target temperature range), that is, the target temperature range can be [XA, X+A], that is, X±A, then the size of A can measure the temperature adjustment accuracy of the welding machine cooling system, the smaller the temperature, the better the temperature adjustment accuracy (that is, if the accuracy of the welding machine cooling system is expected to reach ±A, the target temperature range can be [XA, X+A]). For example, if the first preset threshold value A is 0.5°C and the first target temperature X is 26°C (of course this is just an example, and the first target temperature X can be any value between 26°C and 40°C, and is not limited here), then the target temperature range is [25.5°C, 26.5°C], that is, 26°C±0.5°C, and the third temperature can meet the demand when it is between [25.5°C, 26.5°C].

[0073] For different heating units 20, they also have a temperature adjustment accuracy of ±t2. For example, if t2=0.5℃, the temperature control accuracy is ±0.5℃. If the target temperature of the first cooling medium adjusted by the heating unit 20 is 26℃, the range in which the heating unit 20 can adjust the temperature of the first cooling medium is [25.5℃, 26.5℃].

[0074] In some optional embodiments, referring to Figure 6 In the flowchart in step S104, "heating the first cooling medium at the second temperature by controlling the heating unit according to the second temperature" includes sub-steps S1041 and S1042:

[0075] S1041: Determine a second output of the heating unit according to the second temperature, the first target temperature, and second operating characteristic information of the heating unit.

[0076] The second operating characteristic information is used to indicate the corresponding relationship between the output of the heating unit 20 and the second temperature change before and after the heating unit 20 heats the first cooling medium.

[0077] S1042: Control the heating unit to heat the first cooling medium with a second output power corresponding to the second output amount.

[0078] In the embodiment of the present disclosure, the second working characteristic information may be inherent working characteristic information of the heating unit 20, which may be calibrated before being used. The second working characteristic information may be pre-stored in a storage medium connected to the control unit 30 so that the control unit 30 can call it when needed, so as to reasonably control the heating unit 20 based on it to complete the welding machine cooling task.

[0079] The second temperature variation (denoted as ΔT2) can be calculated based on the temperature collected by the third collector (denoted as T3) and the temperature collected by the second collector (denoted as T2), that is, ΔT2=T3-T2.

[0080] When the output of the heating unit 20 is different, the corresponding second temperature change is different. When the heating unit 20 has different outputs, the second output power for heating the first cooling medium is different. For example, the greater the output of the heating unit 20, the greater the second temperature change, the greater the corresponding second output power, and the higher the third temperature to which the first cooling medium at the second temperature is lowered when heated by the heating unit 20. Conversely, the smaller the output of the heating unit 20, the smaller the second temperature change, the smaller the corresponding second output power, and the lower the third temperature to which the first cooling medium at the second temperature is heated by the heating unit 20. It should be noted that the output of the heating unit 20 is not necessarily linearly related to the second temperature change.

[0081] In some optional embodiments, the output of the heating unit 20 can be expressed as a duty cycle (i.e., 0% to 100%), and different outputs correspond to different second output powers. For example, in one example, when the output of the heating unit 20 is 100%, the second temperature change can reach 8.5°C, but it can be understood that this is not a limitation of the embodiments of the present disclosure.

[0082] In some optional embodiments, the second operating characteristic information includes: a second characteristic curve showing a change in the second temperature variation with a change in the output of the heating unit 20 .

[0083] The second characteristic curve can be calibrated in advance. For example, the second characteristic curve can be a curve with the output of the heating unit 20 as the horizontal coordinate and the second temperature change as the vertical coordinate. Given a temperature value (that is, the second temperature change), the corresponding output can be determined therefrom. Of course, given an output, the corresponding second temperature change can also be determined therefrom. For a calibration process of the first characteristic curve and the second characteristic curve, an optional example will be given below.

[0084] In some optional embodiments, referring to Figure 7 In the flowchart, step S1041, namely "determining the second output of the heating unit according to the second temperature, the first target temperature, and the second working characteristic information of the heating unit", includes sub-steps S31, S32, and S33:

[0085] S31: Determine a second difference between the first target temperature and the second temperature.

[0086] Since the first target temperature is pre-set, after measuring the second temperature of the first cooling medium before entering the heating unit 20 for heating (for example, measuring the temperature of the first cooling medium at the entrance of the heating unit 20 by the second collector 52), the first target temperature can be directly subtracted from the second temperature to determine the second difference.

[0087] S32: Determine a second target output amount from a second characteristic curve according to the second difference.

[0088] It can be understood that the second difference is also a temperature value, and the second difference can be used as the second temperature change amount, and the second target output amount corresponding to the second difference can be directly determined from the second characteristic curve.

[0089] When the control unit 30 controls the heating unit 20 to heat the first cooling medium with the second output power corresponding to the second target output, ideally, the first cooling medium at the second temperature can be heated to the first target temperature (that is, the third temperature is equal to the first target temperature at this time), so as to facilitate the subsequent use of the first cooling medium at the first target temperature to cool the welding machine.

[0090] S33: Taking the second temperature as an input quantity, the first target temperature as a target quantity, and the second target output quantity as a feedforward input quantity, and using a preset second PID algorithm to determine the second output quantity.

[0091] Since the actual heating unit 20 has various interference factors when heating the first cooling medium and cannot reach the ideal state, the preset second PID algorithm is used in the embodiment of the present disclosure to eliminate the interference factors. The P, I, and D parameter values ​​of the second PID algorithm can be reasonably set by humans or automatically updated by software, and there is no restriction here. The second target output is directly input into the second PID algorithm as a feedforward input to improve rapidity and speed up the temperature adjustment speed of the heating unit 20.

[0092] In the embodiment of the present disclosure, the second temperature is used as the input quantity of the second PID algorithm, the first target temperature is used as the target quantity of the second PID algorithm, and the second target output quantity is input into the second PID algorithm as the input quantity of the feedforward control channel of the second PID algorithm. The feedforward control and the PID feedback control are combined to make the second output quantity finally determined more accurate. When the control unit 30 controls the heating unit 20 to heat the first cooling medium with the second output power corresponding to the second output quantity, the deviation between the third temperature to which the first cooling medium at the second temperature is heated and the first target temperature is smaller, thereby improving the temperature control accuracy of the heating unit 20 to a certain extent, and making the temperature adjustment speed faster, so that it is convenient for the subsequent use of the first cooling medium at the third temperature in the embodiment of the present disclosure to cool the welding machine 40, thereby better meeting the demand for cooling the welding machine 40.

[0093] It can be seen that in the embodiment of the present disclosure, for controlling the cooling unit 10 to cool the first cooling medium and controlling the heating unit 20 to heat the first cooling medium, a combination of feedforward control and PID feedback control is used. The two control modes act simultaneously and in parallel, and errors in cooling and heating the first cooling medium can be avoided as much as possible, so that the temperature of the first cooling medium can be adjusted to a reasonable temperature range, and then the first cooling medium can be used to cool the welding machine, thereby effectively avoiding the problem of low cooling accuracy of the welding machine caused by the large lag of the cooling system when cooling the welding machine, and the temperature adjustment speed is also faster, thereby better meeting the cooling demand of the welding machine.

[0094] It is understandable that when the second temperature is equal to the first target temperature, the first cooling medium has reached the first target temperature and no further adjustment is required. Therefore, the heating unit 20 can be controlled to stop heating the first cooling medium to reduce the energy consumption of the heating unit 20.

[0095] In some optional embodiments, the cooling unit 10 may be calibrated to obtain a first characteristic curve, and the heating unit 20 may be calibrated to obtain a second characteristic curve in the following manner. Figure 3Schematic diagram of the welding machine control system in, temporarily disconnect the pipeline on the side of the first collector 51 away from the cooling unit 10, and temporarily disconnect the pipeline on the side of the third collector 53 away from the heating unit 20, connect a constant temperature coolant tank (the coolant tank contains constant temperature coolant) to the pipeline on the side of the first collector 51 away from the cooling unit 10, provide coolant to the pipeline, keep the flow rate of the coolant the same as the coolant flow rate of the first cooling medium when the welding machine cooling system is operating normally, control the output of the cooling unit 10 to change from 0% to 100% in 5% steps, and record the temperature drop (i.e., the temperature collected by the second collector minus the temperature collected by the first collector, i.e., the first temperature change), so as to obtain some data pairs of the output of the cooling unit 10 and the first temperature change, and then fit the first characteristic curve based on these data pairs. Similarly, the output of the heating unit 20 is controlled to change from 0% to 100% in 5% steps, and the temperature rise is recorded at the same time (i.e., the temperature collected by the third collector minus the temperature collected by the second collector, i.e., the second temperature change). In this way, some data pairs of the output of the heating unit 20 and the second temperature change are obtained, and then the second characteristic curve is fitted based on these data pairs. It can be understood that in the example, the step size is changed from 0% to 100% in 5%, and other step sizes can also be selected, such as 1%, 2%, etc., which can meet the needs. The smaller the step size, the more accurate the fitted first characteristic curve / second characteristic curve is generally. Of course, this exemplary process does not serve as any limitation to the embodiments of the present disclosure.

[0096] From the above, it can be seen that in the embodiment of the present disclosure, when cooling the welding machine, the control unit can control the cooling unit to cool the first cooling medium that has been heated to the first temperature after passing through the welding machine, so that the first cooling medium is cooled to the second temperature when it is output from the cooling unit, wherein the second temperature is less than or equal to the first target temperature, and the control unit can also control the heating unit to heat the first cooling medium at the second temperature according to the second temperature, so that the temperature of the first cooling medium reaches the third temperature when it is output from the heating unit, wherein the first cooling medium at the third temperature is used to cool the welding machine when passing through the welding machine, and the absolute value of the difference between the third temperature and the first target temperature is less than the first preset threshold value. Therefore, the welding machine cooling method in the embodiment of the present disclosure no longer only uses the cooling system to cool the welding machine, but combines the cooling unit and the heating unit to facilitate the coarse adjustment of the temperature of the first cooling medium by the cooling unit, and the fine adjustment of the temperature of the first cooling medium by the heating unit to a reasonable temperature range, and then uses the first cooling medium to cool the welding machine, so that the problem of low cooling accuracy of the welding machine caused by the large hysteresis when the cooling system cools the welding machine can be effectively avoided, thereby better meeting the demand for cooling the welding machine.

[0097] According to another aspect of the embodiment of the present disclosure, a welding machine system is also provided, which includes a welding machine 40 and any of the welding machine cooling systems provided above. Since the welding machine system includes the aforementioned welding machine cooling system, the welding machine 40 can be cooled by the welding machine cooling system, and the cooling accuracy of the welding machine cooling system is high, which can meet the demand for cooling the welding machine 40, so the welding machine system in the embodiment of the present disclosure has good cooling performance.

[0098] According to another aspect of the embodiments of the present disclosure, a computer storage medium is provided, which includes: the computer storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute any of the above-mentioned simulation model design methods.

[0099] In the context of the present disclosure, a computer storage medium may be a tangible medium that may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of computer storage media would include an electrical connection based on one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0100] As for the welding machine cooling system, welding machine and computer storage medium embodiments in the embodiments of the present disclosure, they are basically similar to the embodiments of the welding machine cooling method described above, so the description is relatively simple, and the relevant parts can be referred to the partial description of the embodiments of the welding machine cooling method described above.

[0101] It should be understood that expressions similar to "first", "second", "first" or "second" used in the embodiments of the present disclosure can modify various components regardless of order and / or importance, but these expressions do not limit the corresponding components. The above expressions are only configured for the purpose of distinguishing a component from other components.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A welding machine cooling method, applied to a control unit (30) of a welding machine cooling system, wherein the welding machine cooling system further comprises a cooling unit (10), a heating unit (20) and a first cooling medium, the method comprising: Controlling a cooling unit (10) to cool a first cooling medium heated to a first temperature after passing through a welding machine (40), so that the first cooling medium is cooled to a second temperature when output from the cooling unit (10), wherein the second temperature is less than or equal to a first target temperature; The heating unit (20) is controlled according to the second temperature to heat the first cooling medium at the second temperature so that the temperature of the first cooling medium reaches a third temperature when it is output from the heating unit (20), wherein the first cooling medium at the third temperature is used to cool the welding machine (40) when passing through the welding machine (40), and the absolute value of the difference between the third temperature and the first target temperature is less than a first preset threshold value, The cooling unit (10) is configured with a preset cooling target temperature, the cooling target temperature being the first target temperature minus the second preset threshold value; the cooling unit (10) is controlled to cool the first cooling medium that has been heated to the first temperature after passing through the welding machine (40), comprising: determining a first output of the cooling unit (10) according to the first temperature, the cooling target temperature, and first operating characteristic information of the cooling unit (10), wherein the first operating characteristic information is used to indicate a corresponding relationship between the output of the cooling unit (10) and a first temperature change before and after the cooling unit (10) cools the first cooling medium; and the cooling unit (10) is controlled to cool the first cooling medium with a first output power corresponding to the first output. The step of controlling the heating unit (20) to heat the first cooling medium at the second temperature according to the second temperature comprises: determining a second output of the heating unit (20) according to the second temperature, the first target temperature, and second operating characteristic information of the heating unit (20), wherein the second operating characteristic information is used to indicate a corresponding relationship between the output of the heating unit (20) and a second temperature change before and after the heating unit (20) heats the first cooling medium; and controlling the heating unit (20) to heat the first cooling medium with a second output power corresponding to the second output. The first operating characteristic information includes: a first characteristic curve of the first temperature change amount versus the output amount of the cooling unit (10); Determining a first output of the cooling unit (10) according to the first temperature, the cooling target temperature, and first operating characteristic information of the cooling unit (10) comprises: determining a first difference between the cooling target temperature and the first temperature; determining a first target output from the first characteristic curve according to the first difference; The first temperature is used as an input quantity, the cooling target temperature is used as a target quantity, and the first target output quantity is used as a feedforward input quantity, and the first output quantity is determined by using a preset first PID algorithm. The second operating characteristic information includes: a second characteristic curve of the second temperature change amount changing with the output amount of the heating unit (20); Determining a second output of the heating unit (20) according to the second temperature, the first target temperature, and second operating characteristic information of the heating unit (20) comprises: determining a second difference between the first target temperature and the second temperature; determining a second target output from the second characteristic curve according to the second difference; The second temperature is used as an input quantity, the first target temperature is used as a target quantity, and the second target output quantity is used as a feedforward input quantity, and the second output quantity is determined using a preset second PID algorithm.

2. The method according to claim 1, wherein: The first flow rate of the first cooling medium in the cooling unit (10) is constant, and / or the second flow rate of the first cooling medium in the heating unit (20) is constant.

3. The method according to claim 1, wherein: The cooling unit (10) comprises: a cooler (11), a heat exchanger (12) and a second cooling medium, wherein the heat exchanger (12) comprises a first pipeline (121) and a second pipeline (122); The heating unit (20) is connected to the first pipeline (121); the first cooling medium is heated to a first temperature after passing through the welding machine (40) and is input into the first pipeline (121); The cooler (11) is connected to the second pipeline (122), the second cooling medium is cooled to a fourth temperature after passing through the cooler (11), and the second cooling medium at the fourth temperature is input into the second pipeline (122), wherein the fourth temperature is lower than the first temperature; The first cooling medium at the first temperature completes heat exchange with the second cooling medium at the fourth temperature in the heat exchanger (12), so that the first cooling medium is cooled to the second temperature when it is output from the heat exchanger (12).

4. A computer storage medium, wherein: The computer storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the welding machine cooling method according to any one of claims 1-3.

Images