A method and system for gas blowing control of a laser cutting head nozzle

Abstract

The application provides a laser cutting head nozzle blowing control method and system, first axis movement time of each axis of a machine tool movement track is acquired; based on the first axis movement time of each axis, first axis movement time meeting a preset threshold value is screened, second axis movement time is obtained; a blowing delay setting value is set, and the blowing delay setting value and the second axis movement time are compared, a time comparison result is obtained; after the machine tool starts to move, according to the time comparison result, a gas electromagnetic one-way valve of the laser cutting head is controlled to be opened at a corresponding time, so that the nozzle starts to blow. The application opens the cutting head nozzle in advance before laser cutting, reduces the pause time of the laser cutting process, and improves the laser processing efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser cutting, in particular to a laser cutting head nozzle blowing control method and system. BACKGROUND

[0002] In the field of laser processing, when laser cutting is performed, there will be molten metal or small metal particles cooled after molten metal in the kerf. In order to protect the protective lens of the laser cutting head from being sputtered, a spray head needs to be provided on the laser cutting head to blow air, so that the molten metal or small metal particles cooled after the molten metal are blown away. Since the nozzle of the cutting head starts to blow air, the nozzle cannot form a positive pressure state instantaneously. If cutting is not started after waiting for the gas conditions to be met, the protective lens will be damaged.

[0003] Currently, the prior art needs to reach the cutting position before starting the cutting head nozzle and waiting for the gas conditions to be met before cutting, which will cause a long pause in the laser cutting process, thereby causing the problem of low laser processing efficiency. SUMMARY

[0004] To solve the above problems, the present application provides a laser cutting head nozzle blowing control method and system. The present application reduces the pause time of the laser cutting process by starting the cutting head nozzle in advance before laser cutting, thereby improving the laser processing efficiency.

[0005] To achieve the above purpose, the present application provides a laser cutting head nozzle blowing control method, which is applied to a laser cutting head. The laser cutting head comprises a nozzle and a gas electromagnetic one-way valve. The nozzle is in communication with the gas electromagnetic one-way valve. The method comprises the following steps: acquiring the first axis movement time of each axis of the machine tool movement trajectory; based on the first axis movement time of each axis, screening the first axis movement time that meets the preset threshold value to obtain the second axis movement time; setting a blowing delay setting value and comparing the blowing delay setting value with the second axis movement time to obtain a time comparison result; after the machine tool starts to move, controlling the gas electromagnetic one-way valve of the laser cutting head to be opened at the corresponding time according to the time comparison result, so that the nozzle starts to blow air.

[0006] The embodiment of the application provides a laser cutting head nozzle blowing control method, the time of machine tool movement is obtained by analyzing the movement track of the machine tool, the movement time of each axis of the machine tool is screened to obtain the axis movement time meeting the preset threshold, and reliable data basis is provided for subsequent time comparison, then the blowing delay setting value is set for comparison with the axis movement time meeting the preset threshold, the difference between the axis movement time and the blowing delay setting value can be obtained, and then the gas electromagnetic one-way valve of the laser cutting head is opened at the corresponding moment according to different time comparison results after the machine tool starts to move, the pause time of the laser cutting process is reduced, and the laser processing efficiency is improved.

[0007] Further, a target movement track of the machine tool movement is obtained, the target movement track is split into a plurality of axis movement tracks, and first axis movement time of each axis is obtained based on the plurality of axis movement tracks and current movement speed parameters of the plurality of axes. The first axis movement time of each axis is compared one by one, when the first axis movement time of each axis meets the preset threshold, the first axis movement time of the axis meeting the preset threshold is retained to obtain second axis movement time, and when the first axis movement time of each axis does not meet the preset threshold, the first axis movement time of the axis is eliminated.

[0008] Through the above scheme, the target movement track of the machine tool movement is split into a plurality of axis movement tracks, and the first axis movement time of each axis is obtained, and then the axis movement time meeting the preset threshold is taken from the axis movement time, so that the distance parameter of the target movement track is converted into a parameter in the time scale, which provides guarantee for subsequent judgment and control of the opening of the gas electromagnetic one-way valve of the laser cutting head at the corresponding moment, and then the laser processing efficiency is improved.

[0009] Further, the gas electromagnetic one-way valve of the laser cutting head is opened, the pressure value at the nozzle is detected, the opening duration of the gas electromagnetic one-way valve when the nozzle is under positive pressure is obtained, and a blowing delay setting value is obtained. The blowing delay setting value and the second axis movement time are compared to obtain a time comparison result.

[0010] Through the above scheme, the opening duration of the gas electromagnetic one-way valve when the nozzle of the laser cutting head is under positive pressure is detected, so that the blowing delay setting value can ensure that the nozzle of the laser cutting head is necessarily under positive pressure before the laser cutting starts. By comparing the blowing delay setting value with the maximum axis movement time of the machine tool, and according to the time comparison result, the opening time of the gas electromagnetic one-way valve is judged in advance, and the laser processing efficiency is improved.

[0011] Further, if the time comparison result is that the blowing delay set value is less than or equal to the second axis movement time, the gas electromagnetic one-way valve of the laser cutting head is controlled to be opened when the laser cutting head starts to move, so that the nozzle starts to blow. If the time comparison result is that the blowing delay set value is greater than the second axis movement time, a control proportion coefficient is calculated based on the blowing delay set value and the second axis movement time, a control starting point on the target path is obtained based on the control proportion coefficient, and when the machine tool moves to the control starting point, the gas electromagnetic one-way valve of the laser cutting head is controlled to be opened when the laser cutting head moves to the control starting point, so that the nozzle starts to blow.

[0012] By the above scheme, the opening time of the gas electromagnetic one-way valve is determined in advance through the time comparison result, and the gas electromagnetic one-way valve is opened in advance when the machine tool moves, so that the process before laser cutting is smoother, the waiting time after the laser cutting head reaches the target position is reduced, and the laser processing efficiency is improved.

[0013] Further, the laser cutting head nozzle blowing control method also includes: when the machine tool moves to the target position, if the opening time length of the gas electromagnetic one-way valve is greater than the blowing delay set value, the laser cutting head starts to process. When the machine tool moves to the target position, if the opening time length of the gas electromagnetic one-way valve is less than or equal to the blowing delay set value, the laser cutting head executes a waiting process until the opening time length of the gas electromagnetic one-way valve is greater than the blowing delay set value, and then the laser cutting head starts to process.

[0014] By the above scheme, when the machine tool moves to the target position, the relationship between the opening time length of the gas electromagnetic one-way valve and the blowing delay set value is determined again to ensure that the nozzle of the cutting head is in a positive pressure state before laser cutting, the opening of the gas electromagnetic one-way valve is determined in advance and controlled to ensure the overall smoothness of the machine tool movement, reduce the pause in the processing process, and improve the laser processing efficiency.

[0015] The embodiment of the present application also provides a laser cutting head nozzle blowing control system, which comprises: a first time acquisition module, a second time acquisition module, a time comparison module and a nozzle blowing control module; the first time acquisition module is used to acquire the first axis movement time of each axis of a machine tool movement track; the second time acquisition module is used to filter the first axis movement time that meets a preset threshold based on the first axis movement time of each axis, and obtain a second axis movement time; the time comparison module is used to set a blowing delay set value, compare the blowing delay set value with the second axis movement time, and obtain a time comparison result; and the nozzle blowing control module is used to control the gas electromagnetic one-way valve of the laser cutting head to be opened at a corresponding time to make the nozzle start to blow according to the time comparison result after the machine tool starts to move.

[0016] Further, the nozzle blowing control module is used to control the gas electromagnetic one-way valve of the laser cutting head to open at the corresponding time according to the time comparison result, so that the nozzle starts blowing, including: a first control unit and a second control unit; the first control unit is used to control the gas electromagnetic one-way valve of the laser cutting head to open when the laser cutting head starts moving if the time comparison result is that the blowing delay setting value is less than or equal to the second axis movement time; so that the nozzle starts blowing; the second control unit is used to calculate a control proportion coefficient based on the blowing delay setting value and the second axis movement time if the time comparison result is that the blowing delay setting value is greater than the second axis movement time; obtain a control starting point on the target path based on the control proportion coefficient; control the gas electromagnetic one-way valve of the laser cutting head to open when the laser cutting head starts moving when the machine tool moves to the control starting point; so that the nozzle starts blowing.

[0017] The embodiment of the present application provides a laser cutting head nozzle blowing control system, the first time acquisition module is used to analyze the machine tool movement trajectory to obtain the time of machine tool movement, the second time acquisition module is used to screen the movement time of each axis of the machine tool to obtain the axis movement time meeting the preset threshold, and reliable data basis is provided for subsequent time comparison; then the blowing delay setting value is set through the time comparison module and is used for comparison with the axis movement time meeting the preset threshold; and the nozzle blowing control module can be used to control the gas electromagnetic one-way valve of the laser cutting head to open at the corresponding time according to the difference between the axis movement time and the blowing delay setting value, so that the gas electromagnetic one-way valve of the laser cutting head is controlled to open at the corresponding time according to different time comparison results after the machine tool starts moving, the pause time of the laser cutting process is reduced, and the laser processing efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A step flowchart of a laser cutting head nozzle blowing control method provided for an embodiment of the present application Figure 1 ;

[0019] Figure 2 A step flowchart of a laser cutting head nozzle blowing control method provided for an embodiment of the present application Figure 2 ;

[0020] Figure 3 A module structure schematic diagram of a laser cutting head nozzle blowing control system provided for an embodiment of the present application. DETAILED DESCRIPTION

[0021] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0022] Embodiment 1

[0023] Referring to Figure 1 , Figure 1 A step flowchart of a laser cutting head nozzle blowing control method provided for an embodiment of the present application Figure 1 As shown in Figure 2 , the embodiment of the present application proposes a laser cutting head nozzle blowing control method, which comprises steps 101 to 104, and each step is specifically as follows:

[0024] Step 101, acquiring the first axis movement time of each axis of the machine tool movement trajectory;

[0025] As an example of the embodiment, the target movement trajectory of the machine tool movement is acquired, the target movement trajectory is split into a plurality of axis movement trajectories, and the first axis movement time of each axis is acquired based on the plurality of axis movement trajectories and the current movement speed parameters of the plurality of axes.

[0026] In order to make the judgment and control of the opening of the subsequent gas electromagnetic one-way valve of the laser cutting head more accurate, the distance parameters of the target movement trajectory are converted into parameters in the time scale, the scales of the data parameters are unified, a reliable data basis is provided, and then the laser processing efficiency is improved. As an example of a specific implementable manner, taking the xyz coordinate system as an example, the target trajectory of the machine tool movement is split into trajectories in the x-axis, y-axis and z-axis directions, the corresponding starting point and target position point of the machine tool on each axis are acquired, the movement trajectory of each axis is acquired, the current machine tool movement speed parameter is read, and the time of each axis from the starting point to the target position point is calculated respectively. The calculation formula is as follows:

[0027]

[0028] In the formula, t i represents the axis movement time of the x-axis; t j represents the axis movement time of the y-axis; t k represents the axis movement time of the z-axis; x i represents the movement trajectory of the x-axis, wherein i=1, 2, 3,..., i; y j represents the movement trajectory of the y-axis, wherein j=1, 2, 3,..., j; and z k represents the movement trajectory of the z-axis, wherein k=1, 2, 3,..., k; and v0 represents the movement speed parameter of the machine tool at the current time.

[0029] Step 102, screening the first axis movement time that meets the preset threshold based on the first axis movement time of each axis to obtain the second axis movement time;

[0030] As an example of the present embodiment, the first axis movement time of each axis is compared one by one. When the first axis movement time of each axis meets the preset threshold, the first axis movement time of the axis that meets the preset threshold is retained to obtain the second axis movement time. When the first axis movement time of each axis does not meet the preset threshold, the first axis movement time of the axis is eliminated.

[0031] After obtaining the cycle movement time of the plurality of axes, in order to ensure that the nozzle of the subsequent cutting head can be in a positive pressure state, the axis movement time of the plurality of axes needs to be screened. By screening the axis movement time that meets the preset threshold, the subsequent early judgment and the opening of the gas electromagnetic one-way valve of the laser cutting head at the corresponding moment can be supported to improve the laser processing efficiency. In a specific implementation manner, the axis movement time of all axes is compared one by one, and the axis movement time of all axes that meets the preset threshold (such as 10s) is integrated as the second axis movement time. The axis movement time that does not meet the preset threshold is eliminated. In the present embodiment, the maximum value of all axis movement times is preferentially selected as the second axis movement time t max , to better support the subsequent early judgment and the opening of the gas electromagnetic one-way valve of the laser cutting head at the corresponding moment.

[0032] Step 103, setting a blow delay time setting value, and comparing the blow delay time setting value and the second axis movement time to obtain a time comparison result;

[0033] As an example of the present embodiment, the gas electromagnetic one-way valve of the laser cutting head is opened, the pressure value at the nozzle is detected, the opening duration of the gas electromagnetic one-way valve when the nozzle is in a positive pressure state is obtained, and the blow delay time setting value is obtained. The blow delay time setting value and the second axis movement time are compared to obtain a time comparison result.

[0034] In order to ensure that the pressure at the nozzle of the cutting head is positive before starting laser cutting, time comparison needs to be performed after the second axis movement time is obtained, which is used for subsequent judgment on whether the duration of opening the nozzle of the cutting head can meet the requirement of the nozzle of the cutting head reaching positive pressure, so as to improve the laser processing efficiency. In a specific implementation manner, the machine tool is not moved, the gas electromagnetic one-way valve of the laser cutting head is opened, and the pressure at the nozzle of the cutting head is detected in real time. The time required for the nozzle of the cutting head to reach positive pressure is recorded as a gas blowing delay setting value T. In another explanation of the embodiment, the historical gas blowing delay setting value of the same running condition as the current operation condition can also be selected as the gas blowing delay setting value T of the current condition according to the historical operation process. After the gas blowing delay setting value T is set, the second axis movement time t max is compared with the gas blowing delay setting value T, and a time comparison result is obtained. The time comparison result includes: the second axis movement time t max is less than or equal to the gas blowing delay setting value T, and the second axis movement time t max is greater than the gas blowing delay setting value T.

[0035] In step 104, according to the time comparison result, the gas electromagnetic one-way valve of the laser cutting head is controlled to be opened at a corresponding time after the machine tool starts moving, so that the nozzle starts blowing gas.

[0036] As an example of the embodiment, if the time comparison result is that the gas blowing delay setting value is less than or equal to the second axis movement time, the gas electromagnetic one-way valve of the laser cutting head is controlled to be opened when the laser cutting head starts moving, so that the nozzle starts blowing gas. If the time comparison result is that the gas blowing delay setting value is greater than the second axis movement time, a control proportion coefficient is calculated based on the gas blowing delay setting value and the second axis movement time. A control starting point on the target path is obtained based on the control proportion coefficient. When the machine tool moves to the control starting point, the gas electromagnetic one-way valve of the laser cutting head is controlled to be opened when the laser cutting head moves to the control starting point, so that the nozzle starts blowing gas.

[0037] Through the advance judgment of the opening time of the gas electromagnetic one-way valve based on the time comparison result, the gas electromagnetic one-way valve is opened in advance when the machine tool moves, so that the process before laser cutting is smoother, the waiting time after the laser cutting head reaches the target position is reduced, and the laser processing efficiency is improved. In a specific implementation manner, when the time comparison result is that the gas blowing delay setting value T is less than or equal to the second axis movement time t max , that is, when t max is less than or equal to T, the gas electromagnetic one-way valve is opened at the start of movement. When the time comparison result is that the gas blowing delay setting value T is greater than the second axis movement time t max , that is, when t maxWhen T is greater than t, the control proportion coefficient C is calculated, and the specific formula is as follows:

[0038]

[0039] Assuming that the maximum axis motion time is in the x-axis direction, as the second axis motion time t max , and the time comparison result is that the blowing delay set value T is greater than the second axis motion time t max , then in the trajectory x1 from the starting point to the ending point of the machine tool motion, when the machine tool moves to the control starting point x ′ 1, the gas electromagnetic one-way valve is opened, and the calculation formula of the control starting point x ′ 1 is as follows:

[0040] x ′ 1=C*x1

[0041] As another example of an embodiment of the present application, when the machine tool moves to the target position, the relationship between the opening time of the gas electromagnetic one-way valve and the blowing delay set value is judged again to ensure that the cutting head nozzle is in a positive pressure state before laser cutting, the opening of the gas electromagnetic one-way valve is controlled in advance to ensure the overall smoothness of the machine tool motion, reduce the pause in the processing process, and thus improve the laser processing efficiency. A specific implementation manner is described below. Figure 2 , Figure 2 A step flowchart of a laser cutting head nozzle blowing control method provided by an embodiment of the present application Figure 3; when the machine tool moves to the target position, if the opening time length of the gas electromagnetic one-way valve is greater than the gas blowing delay setting value, the laser cutting head is controlled to start processing; when the machine tool moves to the target position, if the opening time length of the gas electromagnetic one-way valve is less than or equal to the gas blowing delay setting value, the laser cutting head is controlled to execute a waiting process until the opening time length of the gas electromagnetic one-way valve is greater than the gas blowing delay setting value, and then the laser cutting head is controlled to start processing; in a specific interpretation, before the machine tool starts to move, the time comparison result is obtained through steps 101 to 103, the machine tool starts to move, and the opening of the gas electromagnetic one-way valve is controlled according to the time comparison result, so that the blowing action is performed in advance during the movement of the machine tool; when the machine tool moves to the target position, the opening time length of the gas electromagnetic one-way valve is compared with the gas blowing delay setting value, if the opening time length of the gas electromagnetic one-way valve is greater than the gas blowing delay setting value, it indicates that the positive pressure is formed at the nozzle of the cutting head due to the blowing action performed in advance during the movement of the machine tool, and the laser cutting processing can be directly started; if the opening time length of the gas electromagnetic one-way valve is less than or equal to the gas blowing delay setting value, it indicates that the positive pressure cannot be completely formed at the nozzle of the cutting head due to the blowing action performed in advance during the movement of the machine tool, and the laser cutting processing can be started only when the opening time length of the gas electromagnetic one-way valve is greater than the gas blowing delay setting value, which indicates that the positive pressure is formed at the nozzle of the cutting head. During the blowing action performed in advance during the movement of the machine tool, the opening time length of the gas electromagnetic one-way valve also needs to be greater than the time for forming the positive pressure at the nozzle of the cutting head, so as to avoid starting the processing before the positive pressure is formed at the nozzle of the cutting head and damaging the protective lens. The waiting time of the prior art is greatly shortened after reaching the target position, and the laser processing efficiency is improved.

[0042] The embodiment of the present application provides a laser cutting head nozzle blowing control method, the movement time of the machine tool is obtained by analyzing the movement track of the machine tool, the movement time of each axis of the machine tool is screened to obtain the axis movement time meeting the preset threshold, and reliable data basis is provided for subsequent time comparison, then the gas blowing delay setting value is set to be compared with the axis movement time meeting the preset threshold, the gas electromagnetic one-way valve of the laser cutting head is opened at the corresponding time according to different time comparison results after the movement of the machine tool starts, the standby time of the laser cutting process is reduced, and the laser processing efficiency is improved.

[0043] Embodiment 2

[0044] Referring to Figure 3 , Figure 3 A module structure schematic diagram of a laser cutting head nozzle blowing control system provided by the embodiment of the present application is shown in the figure. ​As shown, the embodiment of the present application provides a nozzle blowing control system of a laser cutting head, comprising: a first time acquisition module 301, a second time acquisition module 302, a time comparison module 303 and a nozzle blowing control module 304; the first time acquisition module 301 is used to acquire the first axis movement time of each axis of the machine tool movement track; the second time acquisition module 302 is used to filter the first axis movement time meeting the preset threshold based on the first axis movement time of each axis, and obtain the second axis movement time; the time comparison module 303 is used to set the blowing delay setting value, and compare the blowing delay setting value and the second axis movement time to obtain the time comparison result; the nozzle blowing control module 304 is used to control the gas electromagnetic one-way valve of the laser cutting head to open at the corresponding time according to the time comparison result after the machine tool starts to move, so that the nozzle starts to blow.

[0045] As an example of the embodiment of the present application, the nozzle blowing control module 304 is used to control the gas electromagnetic one-way valve of the laser cutting head to open at the corresponding time according to the time comparison result, so that the nozzle starts to blow, comprising: a first control unit 401 and a second control unit 402; the first control unit 401 is used to control the gas electromagnetic one-way valve of the laser cutting head to open at the start of the movement of the laser cutting head if the time comparison result is that the blowing delay setting value is less than or equal to the second axis movement time, so that the nozzle starts to blow; the second control unit 402 is used to calculate the control proportion coefficient based on the blowing delay setting value and the second axis movement time if the time comparison result is that the blowing delay setting value is greater than the second axis movement time; the control starting point on the target path is acquired based on the control proportion coefficient; when the machine tool moves to the control starting point, the gas electromagnetic one-way valve of the laser cutting head is controlled to open at the start of the movement of the laser cutting head, so that the nozzle starts to blow.

[0046] The embodiment of the present application provides a nozzle blowing control system of a laser cutting head, which analyzes the machine tool movement track by the first time acquisition module to acquire the movement time of the machine tool, and filters the movement time of each axis of the machine tool by the second time acquisition module to obtain the axis movement time meeting the preset threshold, thereby providing reliable data basis for subsequent time comparison, and then setting the blowing delay setting value by the time comparison module for comparison with the axis movement time meeting the preset threshold, so that the gas electromagnetic one-way valve of the laser cutting head can be controlled to open at the corresponding time according to the difference between the axis movement time and the blowing delay setting value after the machine tool starts to move, thereby reducing the pause time of the laser cutting process and improving the laser processing efficiency.

[0047] The above merely describes the preferred embodiments of the present application, and it should be pointed out that those skilled in the art can make several improvements and modifications without departing from the technical principles of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

[0048] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0049] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

Claims

1. A method of nozzle blow control for a laser cutting head, applied to a laser cutting head, the laser cutting head comprising: A nozzle and a gas electromagnetic one-way valve in communication with the nozzle, characterized in that the laser cutting head nozzle blowing control method comprises: acquiring first-axis movement time of each axis of a machine tool movement track; based on the first-axis movement time of each axis, screening first-axis movement time meeting a preset threshold to obtain second-axis movement time; setting a blowing delay setting value, and comparing the blowing delay setting value and the second-axis movement time to obtain a time comparison result; after the machine tool starts moving, controlling the gas electromagnetic one-way valve of the laser cutting head to open at a corresponding time according to the time comparison result, so that the nozzle starts blowing. If the time comparison result is that the blowing delay setting value is greater than the second-axis movement time, then based on the blowing delay setting value and the second-axis movement time, a control proportion coefficient is calculated; based on the control proportion coefficient, a control starting point on a target path is acquired; when the machine tool moves to the control starting point, the gas electromagnetic one-way valve of the laser cutting head is controlled to open when the laser cutting head moves to the control starting point, so that the nozzle starts blowing. The acquisition of the first-axis movement time of each axis of the machine tool movement track comprises:

2. A method of gas jet control for a laser cutting head nozzle as defined in claim 1, wherein, acquiring a target movement track of the machine tool movement, and splitting the target movement track into a plurality of axis movement tracks; based on the plurality of axis movement tracks and a plurality of current movement speed parameters of the axes, first-axis movement time of each axis is acquired. Based on the first-axis movement time of each axis, the first-axis movement time meeting the preset threshold is screened to obtain the second-axis movement time, which comprises:

3. A method of gas jet control for a laser cutting head nozzle as defined in claim 1, wherein, one by one comparing the first-axis movement time of each axis, when the first-axis movement time of each axis meets the preset threshold, the first-axis movement time of the axis meeting the preset threshold is retained to obtain the second-axis movement time; when the first-axis movement time of each axis does not meet the preset threshold, the first-axis movement time of the axis is eliminated. The setting of the blowing delay setting value and the comparison of the blowing delay setting value and the second-axis movement time to obtain the time comparison result comprises:

4. A method of gas jet control for a laser cutting head nozzle as defined in claim 1, wherein, opening the gas electromagnetic one-way valve of the laser cutting head, detecting the pressure value at the nozzle, acquiring the opening duration of the gas electromagnetic one-way valve when the nozzle is under positive pressure to obtain the blowing delay setting value; comparing the blowing delay setting value and the second-axis movement time to obtain the time comparison result. If the time comparison result is that the blowing delay setting value is less than or equal to the second-axis movement time, then the gas electromagnetic one-way valve of the laser cutting head is controlled to open when the laser cutting head starts moving, so that the nozzle starts blowing.

5. A method of gas jet control for a laser cutting head nozzle as defined in claim 4, wherein, Further comprising: after the machine tool moves to the target position, if the opening duration of the gas electromagnetic one-way valve is greater than the blowing delay setting value, then the laser cutting head starts processing is controlled.

6. A method of gas blowing control for a laser cutting head nozzle as defined in claim 1, wherein, Further comprising: ​ 7. A method of gas jet control for a laser cutting head nozzle as defined in claim 6, wherein, ​ When the machine tool moves to the target position, if the opening duration of the gas electromagnetic one-way valve is less than or equal to the blow delay setting value, the laser cutting head is controlled to execute a waiting process until the opening duration of the gas electromagnetic one-way valve is greater than the blow delay setting value, and the laser cutting head starts processing.

8. A laser cutting head nozzle blow control system characterized by, The method comprises the following steps: a first time acquisition module, a second time acquisition module, a time comparison module and a nozzle blow control module; the first time acquisition module is used to acquire the first axis movement time of each axis of a machine tool movement track; the second time acquisition module is used to filter the first axis movement time that meets a preset threshold based on the first axis movement time of each axis, and obtain the second axis movement time; the time comparison module is used to set a blow delay setting value, and compare the blow delay setting value and the second axis movement time to obtain a time comparison result; the nozzle blow control module is used to control the gas electromagnetic one-way valve of the laser cutting head to open at a corresponding time according to the time comparison result after the machine tool starts moving, so that the nozzle starts blowing; wherein, the nozzle blow control module is used to control the gas electromagnetic one-way valve of the laser cutting head to open at a corresponding time according to the time comparison result after the machine tool starts moving, so that the nozzle starts blowing, comprising: if the time comparison result is that the blow delay setting value is greater than the second axis movement time, then a control proportion coefficient is calculated based on the blow delay setting value and the second axis movement time; a control starting point on a target path is acquired based on the control proportion coefficient; when the machine tool moves to the control starting point, the gas electromagnetic one-way valve of the laser cutting head is controlled to open when the laser cutting head moves to the control starting point, so that the nozzle starts blowing.

9. A laser cutting head nozzle blow control system as claimed in claim 8, wherein, the nozzle blow control module is used to control the gas electromagnetic one-way valve of the laser cutting head to open at a corresponding time according to the time comparison result, so that the nozzle starts blowing, comprising: a first control unit and a second control unit; the first control unit is used to control the gas electromagnetic one-way valve of the laser cutting head to open when the laser cutting head starts moving, so that the nozzle starts blowing, if the time comparison result is that the blow delay setting value is less than or equal to the second axis movement time; the second control unit is used to calculate a control proportion coefficient based on the blow delay setting value and the second axis movement time if the time comparison result is that the blow delay setting value is greater than the second axis movement time; a control starting point on a target path is acquired based on the control proportion coefficient; when the machine tool moves to the control starting point, the gas electromagnetic one-way valve of the laser cutting head is controlled to open when the laser cutting head starts moving, so that the nozzle starts blowing.

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