A gas automatic mixing system and method applied to a laser cutting machine

Abstract

The application provides a gas automatic mixing system and method applied to a laser cutting machine, relates to the technical field of laser cutting, and specifically comprises a mixing tank and a control module; the mixing tank is connected with a gas mixing pipeline at a gas supply end; two gas supply pipelines are connected with the input end of the gas mixing pipeline; the gas supply end of the mixing tank is connected with a mixed gas analysis pipeline and a laser cutting gas supply pipeline; a mixed gas analyzer is installed on the mixed gas analysis pipeline; the control module obtains nitrogen state information and air state information in the gas supply pipeline based on a pressure transmitter, combines mixed state information analyzed by the mixed gas analyzer, adjusts the nitrogen flow and the air flow through a gas supply flow control component, and makes the mixed gas concentration in the mixing tank meet the laser cutting process requirements. The application solves the problems of uneven mixing of air and nitrogen and inaccurate control of the purity of each gas, continuously and accurately adjusts the mixing of air and nitrogen, meets the cutting needs of different materials and thicknesses of plates, and improves the cutting quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of laser cutting technology, in particular to a gas automatic mixing system and method applied to a laser cutting machine. BACKGROUND

[0002] The auxiliary gas used in the laser cutting process is mixed based on air, oxygen and nitrogen. The mixing degree is set according to the cutting process, and different mixing concentrations are usually matched according to different materials and thicknesses. If the mixing gas concentration is not selected properly, it will seriously affect the cutting quality and speed of the laser cutting machine, and the cut-out plate will have serious slag hanging and the cross section will not be smooth.

[0003] In the prior art, for example, application No. CN201420023101.6 discloses a protective gas automatic mixing device, which comprises a box body, a nitrogen gas inlet, a hydrogen gas inlet and a mixing tank are arranged on the box body, the nitrogen gas inlet is connected with the mixing tank through a nitrogen gas conveying pipeline, a nitrogen gas regulating valve, a nitrogen gas flowmeter and a nitrogen gas pressure gauge are sequentially connected on the nitrogen gas conveying pipeline, the hydrogen gas inlet is connected with the mixing tank through a hydrogen gas conveying pipeline, a hydrogen gas regulating valve, a hydrogen gas flowmeter and a hydrogen gas pressure gauge are sequentially connected on the hydrogen gas conveying pipeline, a mixed gas exhaust pipe is connected on the mixing tank, a mixed gas regulating valve, a mixed gas flowmeter and a mixed gas pressure gauge are sequentially connected on the mixed gas exhaust pipe. The protective gas automatic mixing device of the file introduces hydrogen and nitrogen into the mixing tank through the regulating valve for proportional mixing and then sends them into the annealing furnace. The file discloses that the mixing is completed at one time by controlling the regulating valve according to the needs and then is used. The file cannot comprehensively judge the gas concentration after mixing to determine whether it meets the requirements of the laser cutting process, and cannot dynamically adjust during the cutting process or replace the material quality and thickness for dynamic adjustment, thereby being difficult to meet the requirements of the laser cutting process. Moreover, during the adjustment process, if the nitrogen and air regulating fluctuations are large, the mixed gas concentration will also be affected, thereby causing the problem of low qualification rate of the laser cutting plate. SUMMARY

[0004] The present application provides a gas automatic mixing system applied to a laser cutting machine, which can collect and analyze the mixed gas information and then feed back to the control module for dynamic adjustment of the gas supply to meet the requirements of the laser cutting process and effectively ensure the use requirements of the mixed gas.

[0005] The gas automatic mixing system applied to the laser cutting machine comprises a mixing tank and a control module, and the gas supply end of the mixing tank is connected with a gas mixing pipeline.

[0006] The input end of the gas mixing pipeline is connected with a first gas supply pipeline for supplying nitrogen to the mixing tank and a second gas supply pipeline for supplying air to the mixing tank.

[0007] The gas supply end of the mixing tank is connected with a mixed gas analysis pipeline and a laser cutting gas supply pipeline;

[0008] The first gas supply pipeline is provided with a first pressure transmitter and a first gas supply flow control component;

[0009] The second gas supply pipeline is provided with a second pressure transmitter and a second gas supply flow control component;

[0010] The mixed gas analysis pipeline is provided with a mixed gas analyzer;

[0011] The mixed gas pipeline is provided with a spraying spiral gas supply device and a mixed gas pressure transmitter;

[0012] The control module is connected with the first pressure transmitter, the first gas supply flow control component, the mixed gas analyzer, the second pressure transmitter and the second gas supply flow control component, respectively. The control module acquires nitrogen state information in the first gas supply pipeline based on the first pressure transmitter, acquires air state information in the second gas supply pipeline based on the second pressure transmitter, combines mixed state information analyzed by the mixed gas analyzer, adjusts nitrogen flow through the first gas supply flow control component and adjusts air flow through the second gas supply flow control component, so that the mixed gas concentration in the mixing tank meets the requirements of the laser cutting process.

[0013] It is further needed to be explained that the mixing tank is also connected with a third gas supply pipeline for supplying oxygen to the mixing tank;

[0014] The third gas supply pipeline is provided with a third pressure transmitter and a third gas supply flow control component;

[0015] The control module is connected with the third pressure transmitter and the third gas supply flow control component, respectively. The control module receives a preset oxygen supply amount and controls the oxygen supply amount through the third gas supply flow control component.

[0016] It is further needed to be explained that the third gas supply flow control component includes a third pressure reducing valve, a third high pressure filter, a third fluid control valve, a flow meter and a third one-way valve arranged in the third gas supply pipeline in sequence. The output end of the third one-way valve is connected with the input end of the spraying spiral gas supply device.

[0017] The third fluid control valve and the third flow meter are connected with the control module, respectively.

[0018] It is further needed to be explained that the first gas supply flow control component includes a first pressure reducing valve, a first high pressure filter, a first fluid control valve, a first gas mass flow controller and a first one-way valve arranged in the first gas supply pipeline in sequence. The output end of the first one-way valve is connected with the input end of the spraying spiral gas supply device.

[0019] The first fluid control valve and the first flow meter are connected with the control module respectively.

[0020] It is further explained that the second gas supply flow control assembly comprises a second pressure reducing valve, a second high-pressure filter, a second fluid control valve, a second gas mass flow controller and a second check valve arranged in sequence on the second gas supply pipeline; the output end of the second check valve is connected with the input end of the spray spiral gas supply device.

[0021] The second fluid control valve and the second flow meter are connected with the control module respectively.

[0022] It is further explained that the method further comprises a parameter setting module and a timing module.

[0023] The parameter setting module is used for configuring the setting value of the mixed gas analyzer, the mixed gas adjustment judgment coefficient, the preset analysis algorithm and the mixed gas calibration value meeting the requirements of the laser cutting process by a user.

[0024] The control module controls the first gas supply flow control assembly and the second gas supply flow control assembly to operate respectively based on the mixed gas adjustment value k obtained by the setting value and the preset analysis algorithm, so that the concentration of the mixed gas in the mixing tank tends to approach the mixed gas calibration value.

[0025] The timing module is used for recording the gas supply time of the first gas supply pipeline and the second gas supply pipeline under different gas supply flow rates respectively, and transmitting the gas supply time to the control module.

[0026] It is further explained that the mixed gas adjustment coefficient k is calculated based on the preset analysis algorithm.

[0027] k = (A0-A1) / A0.

[0028] Wherein, A0 is the setting value of the mixed gas analyzer, and A1 is the detection value of the mixed gas analyzer to the mixed gas in the mixing tank.

[0029] The application further provides a gas automatic mixing method applied to a laser cutting machine, which comprises the following steps:

[0030] Step S101, setting the nitrogen given flow value and the air given flow value, and defining the setting value A0 of the mixed gas analyzer.

[0031] Based on the first gas supply pipeline and the second gas supply pipeline to supply gas to the mixing tank, the mixed gas analyzer obtains the detection value A1 of the mixed gas in the mixing tank.

[0032] Based on k1 = (A0-A1) / A0, the mixed gas adjustment coefficient k1 is calculated.

[0033] When k1<-a, a first mixed gas regulation process is performed, and a is a mixed gas regulation judgment coefficient;

[0034] The first mixed gas regulation process includes: increasing the flow of the first gas mass flow controller to a first gas preset amount I, decreasing the flow of the second gas mass flow controller to a second gas preset amount I, after t1 time, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, and judges whether it is in the state of k1<-a. If yes, a second mixed gas regulation process is performed.

[0035] The second mixed gas regulation process includes: maintaining the gas supply state of the gas supply pipeline, and after t2 time, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, and judges whether k1 is more close to-a than the first time. If yes, the gas supply state of the first gas supply pipeline is maintained, a third mixed gas regulation process is performed until the nth time, k1≥-a is reached, and the next step is performed.

[0036] Step S102: performing an n+1th mixed gas regulation process, increasing the flow of the first gas mass flow controller to a first gas preset amount II, and decreasing the flow of the second gas mass flow controller to a second gas preset amount II.

[0037] After t3 time, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, and judges whether it is in the state of-a≤k1<-a+λ, wherein λ>0, and λ is a natural number.

[0038] If yes, an n+2th mixed gas regulation process is performed, the gas supply state of the gas supply pipeline is maintained, and after t4 time, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, and judges whether k1 is more close to-a+λ than the n+1th time.

[0039] If yes, the gas supply state of the n+1th gas supply pipeline is maintained, and an n+3th mixed gas regulation process is performed. Until the nth+m time, k1≥-a+λ is reached, and the next step is performed.

[0040] Step S103: performing an n+m+1th mixed gas regulation process, increasing the flow of the first gas mass flow controller to a first gas preset amount III, and decreasing the flow of the second gas mass flow controller to a second gas preset amount III.

[0041] After t5 time, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, and judges whether it is in the state of-a+λ≤k1<-a+2λ.

[0042] If yes, the n+m+2th mixed gas adjustment process is executed, the gas supply state of the gas supply pipeline is maintained, and after a t6 time period, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether k1 is more close to -a+2l than n+m+1th, and whether it is in the state of k1<-a+2l;

[0043] If yes, the n+m+1th gas supply state is maintained, the n+m+3th mixed gas adjustment process is executed, and until the n+m+qth, k1>=-a+l, the next step is executed.

[0044] Step S104: The n+m+q+1th mixed gas adjustment process is executed, the flow of the first gas mass flow controller is increased to the first gas preset quantity IV, and the flow of the second gas mass flow controller is reduced to the second gas preset quantity IV.

[0045] After a t7 time period, the mixed gas analyzer compares and analyzes the mixed gas state in the mixing tank, judges whether it is in the state of -a+2l<=k1<0.

[0046] If yes, the n+m+q+2th mixed gas adjustment process is executed, the gas supply state of the gas supply pipeline is maintained, and after a t8 time period, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether k1 is more close to 0 than n+m+q+1th, and whether it is in the state of -a+2l<=k1<0, if yes, the n+m+q+1th gas supply state is maintained, the n+m+q+3th mixed gas adjustment process is executed, and until the n+m+q+rth, k1 tends to 0, the gas mixing is completed.

[0047] It should be further explained that the method further comprises:

[0048] Step S201, setting the nitrogen given flow value and the air given flow value, defining the setting value A0 of the mixed gas analyzer;

[0049] Based on the first gas supply pipeline and the second gas supply pipeline to supply gas to the mixing tank, the mixed gas analyzer obtains the detection value A1 of the mixed gas in the mixing tank;

[0050] Based on k2= (A0-A1) / A0, the mixed gas adjustment coefficient k2 is calculated;

[0051] When k2>a, the first mixed gas adjustment process is executed;

[0052] The first mixed gas adjustment process comprises: increasing the flow of the first gas mass flow controller to the third gas preset quantity I, decreasing the flow of the second gas mass flow controller to the fourth gas preset quantity I, after t1 time, the control module compares and analyzes the state of the mixed gas in the mixing tank through the mixed gas analyzer, judges whether it is in the state of k2>a, if yes, executes the second mixed gas adjustment process;

[0053] The second mixed gas adjustment process comprises: keeping the gas supply state of the gas supply pipeline, and after t2 time, the control module compares and analyzes the state of the mixed gas in the mixing tank through the mixed gas analyzer, judges whether k2 is more close to a than the first time, if yes, keeps the gas supply state of the first gas supply pipeline, executes the third mixed gas adjustment process until the nth time, reaches k2>a, and executes the next step;

[0054] Step S202: executing the n+1th mixed gas adjustment process, increasing the flow of the first gas mass flow controller to the third gas preset quantity II, and decreasing the flow of the second gas mass flow controller to the fourth gas preset quantity II;

[0055] After t3 time, the control module compares and analyzes the state of the mixed gas in the mixing tank through the mixed gas analyzer, judges whether it is in the state of a>k2>a-λ;

[0056] If yes, the n+2th mixed gas adjustment process is executed, the gas supply state of the gas supply pipeline is kept, and after t4 time, the control module compares and analyzes the state of the mixed gas in the mixing tank through the mixed gas analyzer, judges whether k2 is more close to a-λ than the n+1th time;

[0057] If yes, the gas supply state of the n+1th gas supply pipeline is kept, and the n+3th mixed gas adjustment process is executed; until the n+mth time, k2>a-λ is reached, and the next step is executed.

[0058] Step S203: executing the n+m+1th mixed gas adjustment process, increasing the flow of the first gas mass flow controller to the third gas preset quantity III, and decreasing the flow of the second gas mass flow controller to the fourth gas preset quantity III;

[0059] After t5 time, the control module compares and analyzes the state of the mixed gas in the mixing tank through the mixed gas analyzer, judges whether it is in the state of a-2λ>k2>0;

[0060] If yes, the n+m+2th mixed gas adjustment process is executed, the gas supply state of the gas supply pipeline is kept, and after t6 time, the control module compares and analyzes the state of the mixed gas in the mixing tank through the mixed gas analyzer, judges whether k2 is more close to 0 than the n+m+1th time, and whether it is in the state of k2<0.

[0061] If yes, the n+m+1th air supply state is maintained, the n+m+3th mixed gas adjustment process is performed until the n+m+qth, k2 approaches to 0, and the gas mixing is completed.

[0062] It is further needed to be explained that, based on the preset fixed value of oxygen supply amount and oxygen supply unit time t 氧 Oxygen is supplied into the mixing tank.

[0063] From the above technical solution, the application has the following advantages:

[0064] The gas automatic mixing system applied to the laser cutting machine provided by the application is full-automatic and continuously adjustable with oxygen, nitrogen and air as the mixed gas sources, can dynamically control and adjust the mixed gas with large flow, and improves the adjustment precision. The problems of uneven mixing of air and nitrogen and inaccurate control of oxygen concentration in the field of laser cutting are overcome. The problems of large adjustment fluctuation of oxygen, nitrogen and air, influence on the mixed gas concentration, and low qualified rate of laser cutting plates are also solved. The system can continuously adjust oxygen, nitrogen and air, meets the cutting needs of different materials and different thickness plates, can improve the mixed gas supply flow, and meets the needs of ten-thousand-watt laser cutting. BRIEF DESCRIPTION OF DRAWINGS

[0065] In order to more clearly illustrate the technical solutions of the application, the drawings needed to be used in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0066] Fig. 1 It is a schematic diagram of the gas automatic mixing system applied to the laser cutting machine.

[0067] Fig. 2 It is a schematic diagram of the embodiment of the gas automatic mixing system applied to the laser cutting machine. DETAILED DESCRIPTION

[0068] The gas automatic mixing system provided by the present application is based on the mixing needs of gases required in the laser cutting process. The mixed gas can include oxygen, nitrogen and air. The gas automatic mixing system mainly realizes the mixing of the three gases based on the software technology level and the hardware technology level, so that the mixed gas meets the needs of the laser cutting process. The present application does not complete the mixing of the three gases at one time. During the mixing process, the system comprehensively judges the mixed gas concentration after each mixing, obtains feedback data, judges whether it is close to the required value of the laser cutting process, and adjusts the proportion of the three mixed gases if necessary, and then realizes the mixed gas meeting the requirements of the laser cutting process through a gradual process.

[0069] The hardware technology level of the gas automatic mixing system of the present application can include, for example, a gas mixing pressure transmitter 5, a sensor, a special artificial intelligence chip, distributed storage, big data processing technology, an operation / interaction system, PLC and the like. The software technology level of the gas automatic mixing system includes but is not limited to object-oriented programming languages such as Java, Smalltalk, C++, and also includes conventional procedural programming languages such as "C" language or similar programming languages. The program code can be completely executed on a control computer, can also be executed as a separate software package, or can be completely executed on a remote computer. The remote computer can be connected to the user computer through any kind of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (for example, connected through the Internet using an Internet service provider).

[0070] The gas automatic mixing system of the present application utilizes programmable logic control technology, establishes a mixed gas adjustment model, utilizes sensor monitoring, data transmission and other technologies, realizes real-time adjustment based on oxygen, nitrogen and air, and then reflects the concentration state of the mixed gas, so as to meet the required concentration range of the laser cutting process. The problem that the components of the mixed gas cannot be continuously and accurately adjusted and cannot be dynamically adjusted according to different cutting plate materials and thicknesses is effectively solved.

[0071] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0072] Please refer to Figs. 1-2The figure is a schematic diagram of a gas automatic mixing system in an embodiment. The system comprises a mixing tank 2 and a control module 1; the mixing tank 2 is connected with a gas mixing pipeline 3 at a gas supply end; the gas mixing pipeline 3 is installed with a spraying spiral gas supply device 4 and a gas mixing pressure transmitter 5; the spraying spiral gas supply device 4 plays a role of spraying gas into the mixing tank 2.

[0073] The input end of the gas mixing pipeline 3 is connected with a first gas supply pipeline 6 for supplying nitrogen gas to the mixing tank 2 and a second gas supply pipeline 7 for supplying air to the mixing tank 2; the gas output end of the mixing tank 2 is connected with a mixed gas analysis pipeline and a laser cutting gas supply pipeline 8;

[0074] The first gas supply pipeline 6 is installed with a first pressure transmitter 10 and a first gas supply flow control assembly 31; the first gas supply pipeline 6 can be used as a nitrogen gas supply pipeline. The first pressure transmitter 10 can realize sensing of the nitrogen gas pressure in the first gas supply pipeline 6.

[0075] By way of example, the first gas supply flow control assembly 31 comprises a first pressure reducing valve 11, a first high-pressure filter 12, a first fluid control valve 13, a first gas mass flow controller 14 and a first check valve 15 which are sequentially arranged on the first gas supply pipeline 6; the output end of the first check valve 15 is connected with the input end of the spraying spiral gas supply device 4; the first fluid control valve 13 and a first flowmeter 27 are respectively connected with the control module 1.

[0076] The gas supply process of the first gas supply pipeline 6 can comprise: the first gas supply pipeline 6 is connected with a nitrogen gas source, the gas pressure is stabilized through the first pressure reducing valve 11, the gas with higher cleanliness is obtained through the first high-pressure filter 12, the gas pressure is monitored in real time through the first pressure transmitter 10, the detected pressure signal is fed back to the control module 1, the gas is controlled to be turned on or off through the first fluid control valve 13, the flow of the pipeline gas is adjusted through the first gas mass flow controller 14, and finally the gas is sprayed into the mixing tank 2 through the first check valve 15 and the spraying spiral gas supply device 4 for mixing.

[0077] The second gas supply pipeline 7 is installed with a second pressure transmitter 16 and a second gas supply flow control assembly 32; the second gas supply pipeline 7 can be used as an air supply pipeline.

[0078] As an embodiment of the present application, the second gas supply flow control assembly 32 comprises a second pressure reducing valve 17, a second high-pressure filter 18, a second fluid control valve 19, a second gas mass flow controller 20 and a second check valve 21 which are sequentially arranged on the second gas supply pipeline 7; the output end of the second check valve 21 is connected with the input end of the spraying spiral gas supply device 4; the second fluid control valve 19 and a second flowmeter 27 are respectively connected with the control module 1.

[0079] The air supply process of the second air supply pipeline 7 can include: the second air supply pipeline 7 is connected to an air source, the gas pressure is stabilized through the second pressure reducing valve 17, the gas with high cleanliness is obtained through the second high-pressure filter 18, the gas pressure is monitored in real time through the second pressure transmitter 16, the detected pressure signal is fed back to the control module 1, the gas is controlled to be turned on or turned off through the second fluid control valve 19, the flow of the pipeline gas is adjusted through the second gas mass flow controller 20, and finally the gas is sprayed into the mixing tank 2 through the second check valve 21 and the spraying spiral air supply device 4 for mixing.

[0080] The mixed gas of the application also relates to oxygen, wherein the mixing tank 2 obtains oxygen through a third air supply pipeline 22. The third air supply pipeline 22 is provided with a third pressure transmitter 23 and a third air supply flow control assembly; the control module 1 is connected with the third pressure transmitter 23 and the third air supply flow control assembly respectively, the control module 1 receives a preset oxygen supply amount, and the supply amount of the oxygen is controlled through the third air supply flow control assembly.

[0081] In the application, the third air supply flow control assembly includes a third pressure reducing valve 24, a third high-pressure filter 25, a third fluid control valve 26, a flow meter 27 and a third check valve 28 arranged in sequence on the third air supply pipeline 22; the output end of the third check valve 28 is connected with the input end of the spraying spiral air supply device 4; the third fluid control valve 26 and the third flow meter 27 are connected with the control module 1 respectively.

[0082] The oxygen supply process of the third air supply pipeline 22 can include: the third air supply pipeline 22 is connected to an oxygen source, the gas pressure is stabilized through the third pressure reducing valve 24, the gas with high cleanliness is obtained through the third high-pressure filter 25, the gas pressure is monitored in real time through the third pressure transmitter 23, the detected pressure signal is fed back to the control module 1, the gas is controlled to be turned on or turned off through the third fluid control valve 26, the flow of the pipeline gas is adjusted through the third gas mass flow controller, and finally the oxygen is sprayed into the mixing tank 2 through the third check valve 28 and the spraying spiral air supply device 4 for mixing.

[0083] The mixed gas analysis pipeline is provided with a mixed gas analyzer 9; the mixed gas analyzer 9 can obtain the mixed gas in the mixing tank 2 and analyze the components of the mixed gas. The mixed gas analyzer 9 can use the oxygen content to deduce other contents, that is, according to the needs of the cutting process, the component concentration of the mixed gas can be analyzed, and then the dynamic adjustment of the mixed gas can be realized.

[0084] In the embodiment of the present application, the control module 1 is connected with the first pressure transmitter 10, the first gas supply flow control assembly 31, the mixed gas analyzer 9, the second pressure transmitter 16 and the second gas supply flow control assembly 32 respectively. The control module 1 obtains the nitrogen state information in the first gas supply pipeline 6 based on the first pressure transmitter 10, obtains the air state information in the second gas supply pipeline 7 based on the second pressure transmitter 16, and combines the mixed state information analyzed by the mixed gas analyzer 9, adjusts the nitrogen flow through the first gas supply flow control assembly 31 and adjusts the air flow through the second gas supply flow control assembly 32, so that the mixed gas concentration inside the mixing tank 2 meets the requirements of the laser cutting process.

[0085] The control module 1 is the core control element in the system, which can be a special artificial intelligence chip in the hardware technology layer of the system, has distributed storage and operation / interaction functions, and preferably adopts PLC technology. The software of the system is installed in the control module 1 to realize dynamic adjustment of the mixed gas and meet the requirements of the laser cutting process.

[0086] As the present application before mixing gas, it is necessary to set the mixed gas concentration value in advance, and a mixed gas calibration value can also be set. The control module 1 can control the mixed concentration of the gas by controlling the first gas supply flow control assembly 31, the second gas supply flow control assembly 32 and the third gas supply flow control assembly based on the mixed gas calibration value and the concentration state of the mixed gas fed back by the mixed gas analyzer 9. Of course, in the control process, it is not based on one-time adjustment to reach the preset mixed gas calibration value, and it is necessary to gradually adjust the flow of each gas so that the mixed gas gradually tends to the mixed gas calibration value to meet the concentration range required by the laser cutting process.

[0087] In an exemplary embodiment, the system further comprises a parameter setting module and a timing module;

[0088] The parameter setting module is used for the user to configure the set value of the mixed gas analyzer 9, the mixed gas adjustment judgment coefficient, the preset analysis algorithm and the mixed gas calibration value meeting the requirements of the laser cutting process;

[0089] The control module 1 controls the first gas supply flow control assembly 31 and the second gas supply flow control assembly 32 to operate based on the set value and the mixed gas adjustment value k obtained by the preset analysis algorithm, so that the mixed gas concentration inside the mixing tank 2 approaches the mixed gas calibration value;

[0090] The timing module is configured to record the gas supply time of the first gas supply pipeline 6 and the second gas supply pipeline 7 respectively under different gas supply flow rates, and transmit the gas supply time to the control module 1, and the control module 1 controls the actions of the first gas flow control assembly 31, the second gas flow control assembly 32 and the third gas flow control assembly based on the gas supply time.

[0091] In the present application, the preset analysis algorithm is: k = (A0-A1) / A0.

[0092] Wherein, A0 is the set value of the mixed gas analyzer 9, and A1 is the detection value of the mixed gas analyzer 9 to the mixed gas inside the mixing tank 2. In this way, the mixed gas adjustment coefficient k can be obtained.

[0093] The range of A0 can be set to 4-20mA. A1 is the detection value obtained after the mixed gas analyzer 9 analyzes the mixed gas inside the mixing tank 2. The value of A1 can be greater than, equal to, or less than A0. In this way, the value of k is calculated by the preset analysis algorithm (A0-A1) / A0, and the control module 1 can adjust the value of A1 based on the control of the first gas flow control assembly 31, the second gas flow control assembly 32 and the third gas flow control assembly, adjust the value of k, and compare the value of k with the mixed gas adjustment judgment coefficient in the adjustment process. Based on the judgment result, the state of the value of k is known, and then the control module 1 needs to control the first gas flow control assembly 31, or the second gas flow control assembly 32, or the third gas flow control assembly to act, so that the value of k tends to the mixed gas calibration value, and then the mixed gas meets the required concentration range of the current laser cutting process. The mixed gas adjustment judgment coefficient can prevent the value of k from deviating, which can cause the current mixed gas to completely fail to meet the laser cutting process. The mixed gas adjustment judgment coefficient can also make the value of k gradually approach the mixed gas calibration value.

[0094] For example, if A0 is set to 10 mA and the detection value A1 obtained by the mixed gas analyzer 9 after analyzing the mixed gas in the mixing tank 2 is 12, then k is calculated by (A0-A1) / A0, and k is -0.2, and the mixed gas calibration value is set to 0. Then, the control module 1 can adjust the flow of nitrogen or air based on the control of the first gas flow control assembly 31, the second gas flow control assembly 32 and the third gas flow control assembly. After the mixed gas analyzer 9 analyzes the mixed gas in the mixing tank 2 in real time, the value of A1 changes, and the value of k is compared with the mixed gas adjustment judgment coefficient to determine the state of k based on the judgment result. Then, it is determined that the control module 1 needs to control the first gas flow control assembly 31, or the second gas flow control assembly 32, or the third gas flow control assembly to act. Then, k is calculated by (A0-A1) / A0 again to make k further approach the mixed gas calibration value 0 until the concentration range required by the current laser cutting process is reached.

[0095] Of course, there is another way, for example, if A0 is set to 10 mA and the detection value A1 obtained by the mixed gas analyzer 9 after analyzing the mixed gas in the mixing tank 2 is 8, then k is calculated by (A0-A1) / A0, and k is 0.2, and the mixed gas calibration value is set to 0. Then, the control module 1 can adjust the flow of nitrogen or air based on the control of the first gas flow control assembly 31, the second gas flow control assembly 32 and the third gas flow control assembly. After the mixed gas analyzer 9 analyzes the mixed gas in the mixing tank 2 in real time, the value of A1 changes, and the value of k is compared with the mixed gas adjustment judgment coefficient to determine the state of k based on the judgment result. Then, it is determined that the control module 1 needs to control the first gas flow control assembly 31, or the second gas flow control assembly 32, or the third gas flow control assembly to act. Then, k is calculated by (A0-A1) / A0 again to make k further approach the mixed gas calibration value 0 until the concentration range required by the current laser cutting process is reached.

[0096] The mixed gas calibration value can be set based on the requirements of the laser cutting process. The specific value is not limited here.

[0097] For the concentration adjustment of the mixed gas of the laser cutting process of the present application, the oxygen is usually delivered at a constant flow, and the contents of nitrogen and air are mainly adjusted. Of course, the contents of oxygen, nitrogen and air can also be dynamically adjusted according to actual needs to meet the requirements of the laser cutting process.

[0098] Thus, the application provides the gas automatic mixing system applied to the laser cutting machine, which uses oxygen, nitrogen and air as the mixed gas source to realize full-automatic continuous adjustable control, can dynamically control and adjust the mixed gas with large flow, and improves the adjustment precision. The problems of uneven mixing of air and nitrogen and inaccurate control of oxygen concentration in the field of laser cutting are overcome. The problems of large adjustment fluctuation of oxygen, nitrogen and air, influence on the mixed gas concentration, and low qualified rate of laser cutting plates are solved. The system can continuously adjust the oxygen, nitrogen and air to meet the cutting needs of plates with different materials and different thicknesses, can improve the mixed gas supply flow, and can meet the needs of ten-thousand-watt laser cutting.

[0099] The following is an embodiment of the gas automatic mixing method applied to the laser cutting machine provided by the embodiment of the present disclosure. The method belongs to the same inventive concept as the gas automatic mixing system applied to the laser cutting machine described above. Details not described in the embodiment of the gas automatic mixing method applied to the laser cutting machine can be referred to the embodiment of the gas automatic mixing system applied to the laser cutting machine described above.

[0100] The method comprises:

[0101] In step S101, the nitrogen given flow value and the air given flow value are set, and the set value A0 of the mixed gas analyzer is defined. The nitrogen given flow value and the air given flow value are flow values pre-set by the user before cutting. The flow values may not match the cutting needs of plates with different materials and different thicknesses, so it is necessary to dynamically adjust each component of the mixed gas to match the cutting process needs. The method of the present application mainly takes the adjustment of the flow of nitrogen and air as an example, and oxygen is supplied into the mixing tank based on the preset fixed value of the supply amount.

[0102] The first gas supply pipeline and the second gas supply pipeline supply gas to the mixing tank, and the mixed gas analyzer obtains the detection value A1 of the mixed gas in the mixing tank;

[0103] Based on k1= (A0-A1) / A0, the mixed gas adjustment coefficient k1 is calculated;

[0104] When k1<-a, the first mixed gas adjustment process is executed, and-a is the mixed gas adjustment judgment coefficient;

[0105] The first mixed gas adjustment process comprises: increasing the flow of the first gas mass flow controller to the first gas preset amount I, and reducing the flow of the second gas mass flow controller to the second gas preset amount I. After t1 time, the control module compares and analyzes the state of the mixed gas in the mixing tank through the mixed gas analyzer, judges whether it is in the state of k1<-a, and if so, executes the second mixed gas adjustment process;

[0106] The second mixed gas adjusting process includes: keeping the gas supply state of the gas supply pipeline, and after a t2 time period, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether k1 is more close to -a than the first time, if so, keeps the gas supply state of the first gas supply pipeline, executes the third mixed gas adjusting process until the nth time, reaches k1≥-a, and executes the next step;

[0107] Step S102: executing the n+1th mixed gas adjusting process, increasing the flow of the first gas mass flow controller to the first gas preset quantity II, and decreasing the flow of the second gas mass flow controller to the second gas preset quantity II;

[0108] After a t3 time period, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether it is in the state of -a≤k1<-a+λ, wherein λ>0, and λ is a natural number; λ can be set by the user based on the laser cutting process. The operation of -a+λ is used to realize the guidance of k1 approaching the mixed gas calibration value.

[0109] If yes, the n+2th mixed gas adjusting process is executed, the gas supply state of the gas supply pipeline is kept, and after a t4 time period, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether k1 is more close to -a+λ than the n+1th time;

[0110] If yes, the gas supply state of the n+1th gas supply pipeline is kept, and the n+3th mixed gas adjusting process is executed; until the n+mth time, k1≥-a+λ is reached, and the next step is executed;

[0111] Step S103: executing the n+m+1th mixed gas adjusting process, increasing the flow of the first gas mass flow controller to the first gas preset quantity III, and decreasing the flow of the second gas mass flow controller to the second gas preset quantity III;

[0112] After a t5 time period, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether it is in the state of -a+λ≤k1<-a+2λ;

[0113] If yes, the n+m+2th mixed gas adjusting process is executed, the gas supply state of the gas supply pipeline is kept, and after a t6 time period, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether k1 is more close to -a+2λ than the n+m+1th time, and whether it is in the state of k1<-a+2λ;

[0114] If yes, the n+m+1th gas supply state is kept, the n+m+3th mixed gas adjusting process is executed, and until the n+m+qth time, k1≥-a+λ is reached, and the next step is executed;

[0115] Step S104: performing the n+m+q+1th mixed gas adjustment process, increasing the flow of the first gas mass flow controller to the first gas preset quantity IV, and decreasing the flow of the second gas mass flow controller to the second gas preset quantity IV;

[0116] After the t7 time period, the mixed gas analyzer compares and analyzes the state of the mixed gas in the mixing tank, and determines whether it is in the state of -a+2λ≤k1<0.

[0117] If yes, the n+m+q+2th mixed gas adjustment process is performed, the gas supply state of the gas supply pipeline is maintained, and after the t8 time period, the control module compares and analyzes the state of the mixed gas in the mixing tank through the mixed gas analyzer, determines whether k1 is more close to 0 than the n+m+q+1th time, and whether it is in the state of -a+2λ≤k1<0. If yes, the n+m+q+1th gas supply state is maintained, the n+m+q+3th mixed gas adjustment process is performed, and the n+m+q+rth time is performed until k1 is close to 0, and the gas mixing is completed.

[0118] Further, as a refinement and expansion of the above embodiment, in order to completely describe the specific implementation process in this embodiment, another automatic gas mixing method is provided, which comprises:

[0119] Step S201, setting the nitrogen given flow value and the air given flow value, and defining the set value A0 of the mixed gas analyzer;

[0120] Based on the first gas supply pipeline and the second gas supply pipeline, the mixed gas analyzer obtains the detection value A1 of the mixed gas in the mixing tank;

[0121] Based on k2= (A0-A1) / A0, the mixed gas adjustment coefficient k2 is calculated;

[0122] When k2>a, the first mixed gas adjustment process is performed;

[0123] The first mixed gas adjustment process comprises: increasing the flow of the first gas mass flow controller to the third gas preset quantity I, decreasing the flow of the second gas mass flow controller to the fourth gas preset quantity I, and after the t1 time period, the control module compares and analyzes the state of the mixed gas in the mixing tank through the mixed gas analyzer, and determines whether it is in the state of k2>a. If yes, the second mixed gas adjustment process is performed.

[0124] The second mixed gas adjustment process includes: keeping the gas supply state of the gas supply pipeline, and after a t2 time period, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether k2 is closer to a than the first time, if yes, keeps the gas supply state of the first gas supply pipeline, executes the third mixed gas adjustment process until the nth time, reaches k2>a, and executes the next step;

[0125] Step S202: executing the n+1th mixed gas adjustment process, increasing the flow of the first gas mass flow controller to the third gas preset quantity II, and decreasing the flow of the second gas mass flow controller to the fourth gas preset quantity II;

[0126] After a t3 time period, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether it is in a≥k2>a-λ;

[0127] If yes, the n+2th mixed gas adjustment process is executed, the gas supply state of the gas supply pipeline is kept, and after a t4 time period, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether k2 is closer to a-λ than the n+1th time;

[0128] If yes, the gas supply state of the n+1th gas supply pipeline is kept, and the n+3th mixed gas adjustment process is executed; until the nth+m time, k2≥a-λ is reached, and the next step is executed;

[0129] Step S203: executing the n+m+1th mixed gas adjustment process, increasing the flow of the first gas mass flow controller to the third gas preset quantity III, and decreasing the flow of the second gas mass flow controller to the fourth gas preset quantity III;

[0130] After a t5 time period, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether it is in a-2λ>k2>0;

[0131] If yes, the n+m+2th mixed gas adjustment process is executed, the gas supply state of the gas supply pipeline is kept, and after a t6 time period, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether k2 is closer to 0 than the n+m+1th time, and whether it is in the state of k2<0;

[0132] If yes, the n+m+1th gas supply state is kept, the n+m+3th mixed gas adjustment process is executed, and until the n+m+qth time, k2 approaches 0, and the gas mixing is completed.

[0133] It should be understood that the size of the serial number of each step in the above-mentioned embodiments does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0134] Thus, the present application can collect and analyze mixed gas information and feedback to the control module for dynamic adjustment of the gas supply, meet the requirements of laser cutting process, effectively guarantee the use requirements of mixed gas. The present application can also efficiently collect, store and process mixed gas information, and can realize dynamic regulation and control based on the requirements of laser cutting process, realize multi-dimensional space control of mixed gas, improve the quality and efficiency of laser cutting, discover the state information of mixed gas in time, and adjust, so as to realize the timeliness and scientific nature of dynamic management and control of the whole process of laser cutting gas supply.

[0135] The units and algorithm steps of each example described in the embodiments disclosed in the gas automatic mixing method applied to the laser cutting machine provided by the present application can be realized by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether the functions are executed in hardware or software mode depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0136] The units and algorithm steps of each example described in the embodiments disclosed in the gas automatic mixing method provided by the present application can be realized by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether the functions are executed in hardware or software mode depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0137] The terms "first", "second", "third", "fourth" and the like (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily mean a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0138] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the appended claims are intended to cover all such modifications that do not depart from the true spirit and scope of the application. Therefore, the application is not limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for automatically mixing gases applied to a laser cutting machine, characterized by, The method adopts a gas automatic mixing system applied to a laser cutting machine; The system comprises a mixing tank and a control module; the mixing tank is connected with a gas mixing pipeline at a gas supply end; The gas mixing pipeline is connected with a first gas supply pipeline for supplying nitrogen to the mixing tank and a second gas supply pipeline for supplying air to the mixing tank at an input end; The gas supply end of the mixing tank is connected with a mixed gas analysis pipeline and a laser cutting gas supply pipeline; The first gas supply pipeline is installed with a first pressure transmitter and a first gas supply flow control component; The second gas supply pipeline is installed with a second pressure transmitter and a second gas supply flow control component; The mixed gas analysis pipeline is installed with a mixed gas analyzer; The gas mixing pipeline is installed with a spraying spiral gas supply device and a mixed gas pressure transmitter; The control module is connected with the first pressure transmitter, the first gas supply flow control component, the mixed gas analyzer, the second pressure transmitter and the second gas supply flow control component respectively; the control module acquires nitrogen state information in the first gas supply pipeline based on the first pressure transmitter, acquires air state information in the second gas supply pipeline based on the second pressure transmitter, combines mixed state information analyzed by the mixed gas analyzer, adjusts nitrogen flow through the first gas supply flow control component and adjusts air flow through the second gas supply flow control component, so that the mixed gas concentration in the mixing tank meets the laser cutting process requirements; The method comprises: Step S101, setting a nitrogen given flow value and an air given flow value, and defining a set value A0 of the mixed gas analyzer; Based on the first gas supply pipeline and the second gas supply pipeline, the mixed gas analyzer acquires a detection value A1 of the mixed gas in the mixing tank; Based on k1= (A0-A1) / A0, a mixed gas adjustment coefficient k1 is calculated; When k1<-a, a first mixed gas adjustment process is executed, and -a is a mixed gas adjustment judgment coefficient; The first mixed gas adjustment process comprises: increasing the flow of the first gas mass flow controller to a first gas preset amount I, reducing the flow of the second gas mass flow controller to a second gas preset amount I, and after t1 time, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer to determine whether it is in the state of k1<-a. If yes, a second mixed gas adjustment process is executed; The second mixed gas adjustment process comprises: maintaining the gas supply state of the gas supply pipeline, and after t2 time, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer to determine whether k1 is more close to -a than the first time. If yes, the gas supply state of the first gas supply pipeline is maintained, a third mixed gas adjustment process is executed, and the process is repeated until the nth time, k1≥-a is reached, and the next step is executed; Step S102: executing an (n+1)th mixed gas adjustment process, increasing the flow of the first gas mass flow controller to a first gas preset amount II, and reducing the flow of the second gas mass flow controller to a second gas preset amount II; After t3 time, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer to determine whether it is in the state of -a≤k1<-a+λ, where λ>0 and λ is a natural number. If yes, the n+2th mixed gas adjustment process is executed, the gas supply state of the gas supply pipeline is maintained, and after a t4 time period, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether k1 is more close to -a+λ than n+1th, and if yes, the n+3th mixed gas adjustment process is executed until the n+mth, k1≥-a+λ is reached, and the next step is executed. If yes, the n+1th gas supply state is maintained, and the n+3th mixed gas adjustment process is executed until the n+mth, k1≥-a+λ is reached, and the next step is executed. Step S103: The n+m+1th mixed gas adjustment process is executed, the flow of the first gas mass flow controller is increased to the first gas preset quantity III, and the flow of the second gas mass flow controller is reduced to the second gas preset quantity III. After a t5 time period, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether it is in the state of -a+λ≤k1<-a+2λ, and if yes, the n+m+2th mixed gas adjustment process is executed, the gas supply state of the gas supply pipeline is maintained, and after a t6 time period, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether k1 is more close to -a+2λ than n+m+1th, and whether it is in the state of k1<-a+2λ. If yes, the n+m+1th gas supply state is maintained, the n+m+3th mixed gas adjustment process is executed until the n+m+qth, k1≥-a+λ is reached, and the next step is executed. Step S104: The n+m+q+1th mixed gas adjustment process is executed, the flow of the first gas mass flow controller is increased to the first gas preset quantity IV, and the flow of the second gas mass flow controller is reduced to the second gas preset quantity IV. After a t7 time period, the mixed gas analyzer compares and analyzes the mixed gas state in the mixing tank, judges whether it is in the state of -a+2λ≤k1<0, and if yes, the n+m+q+2th mixed gas adjustment process is executed, the gas supply state of the gas supply pipeline is maintained, and after a t8 time period, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether k1 is more close to 0 than n+m+q+1th, and whether it is in the state of -a+2λ≤k1<0, if yes, the n+m+q+1th gas supply state is maintained, the n+m+q+3th mixed gas adjustment process is executed until the n+m+q+rth, k1 tends to 0, and the gas mixing is completed. The mixing tank is also connected with a third gas supply pipeline for supplying oxygen to the mixing tank; The third gas supply pipeline is provided with a third pressure transmitter and a third gas supply flow control assembly; 2. The method for automatic mixing of gases applied to a laser cutting machine according to claim 1, characterized in that, The control module is connected with the third pressure transmitter and the third gas supply flow control assembly, respectively, receives a preset oxygen supply amount, and controls the oxygen supply amount by controlling the third gas supply flow control assembly.

3. The gas automatic mixing method applied to the laser cutting machine according to claim 2, characterized in that, ​ ​ The third gas supply flow control assembly comprises a third pressure reducing valve, a third high-pressure filter, a third fluid control valve, a flow meter and a third check valve arranged in sequence on the third gas supply pipeline; the output end of the third check valve is connected with the input end of the spray spiral gas supply device; The third fluid control valve and the third flow meter are connected with the control module respectively.

4. The automatic gas mixing method applied to a laser cutting machine according to claim 1 or 2, characterized in that, The first gas supply flow control assembly comprises a first pressure reducing valve, a first high-pressure filter, a first fluid control valve, a first gas mass flow controller and a first check valve arranged in sequence on the first gas supply pipeline; the output end of the first check valve is connected with the input end of the spray spiral gas supply device; The first fluid control valve and the first flow meter are connected with the control module respectively.

5. The automatic gas mixing method applied to a laser cutting machine according to claim 1 or 2, characterized in that, The second gas supply flow control assembly comprises a second pressure reducing valve, a second high-pressure filter, a second fluid control valve, a second gas mass flow controller and a second check valve arranged in sequence on the second gas supply pipeline; the output end of the second check valve is connected with the input end of the spray spiral gas supply device; The second fluid control valve and the second flow meter are connected with the control module respectively.

6. The method for automatic mixing of gases applied to a laser cutting machine according to claim 2, characterized in that, Further comprising: a parameter setting module and a timing module; The parameter setting module is used for a user to configure the set value of the mixed gas analyzer, the mixed gas adjustment judgment coefficient, the preset analysis algorithm and the mixed gas calibration value meeting the requirements of the laser cutting process; The control module controls the first gas supply flow control assembly and the second gas supply flow control assembly to operate based on the set value and the mixed gas adjustment value k obtained by combining the preset analysis algorithm, so that the concentration of the mixed gas in the mixing tank tends to approach the mixed gas calibration value; The timing module is used for recording the gas supply time of the first gas supply pipeline and the second gas supply pipeline under different gas supply flow rates respectively, and transmitting the gas supply time to the control module.

7. The method for automatic mixing of gases applied to a laser cutting machine according to claim 6, characterized in that, The mixed gas adjustment coefficient k is calculated based on the preset analysis algorithm: k = (A0-A1) / A0; Wherein, A0 is the set value of the mixed gas analyzer, and A1 is the detection value of the mixed gas analyzer to the mixed gas in the mixing tank.

8. The method for automatic mixing of gases applied to a laser cutting machine according to claim 1, characterized in that, The method further comprises: Step S201, setting the nitrogen given flow value and the air given flow value, and defining the set value A0 of the mixed gas analyzer; Based on the gas supply of the first gas supply pipeline and the second gas supply pipeline to the mixing tank, the mixed gas analyzer obtains the detection value A1 of the mixed gas in the mixing tank; Based on k2 = (A0-A1) / A0, the mixed gas adjustment coefficient k2 is calculated; When k2>a, the first mixed gas adjustment process is executed; The first mixed gas adjustment process comprises: increasing the flow of the first gas mass flow controller to the third gas preset amount I, reducing the flow of the second gas mass flow controller to the fourth gas preset amount I, and after t1 time, the control module compares and analyzes the state of the mixed gas in the mixing tank through the mixed gas analyzer, and judges whether it is in the state of k2>a, if yes, the second mixed gas adjustment process is executed; The second mixed gas adjusting process includes: keeping the gas supply state of the gas supply pipeline, and after t2 time, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether k2 is more close to a than the first time, if yes, keeps the gas supply state of the first gas supply pipeline, executes the third mixed gas adjusting process until the nth time, reaches k2>a, and executes the next step; Step S202: executing the n+1th mixed gas adjusting process, improving the flow of the first gas mass flow controller to the third gas preset quantity II, and reducing the flow of the second gas mass flow controller to the fourth gas preset quantity II; After t3 time, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether it is in a≥k2>a-λ; If yes, the n+2th mixed gas adjusting process is executed, the gas supply state of the gas supply pipeline is kept, and after t4 time, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether k2 is more close to a-λ than the n+1th time; If yes, the gas supply state of the n+1th gas supply pipeline is kept, the n+3th mixed gas adjusting process is executed; until the n+mth time, k2≥a-λ is reached, and the next step is executed; Step S203: executing the n+m+1th mixed gas adjusting process, improving the flow of the first gas mass flow controller to the third gas preset quantity III, and reducing the flow of the second gas mass flow controller to the fourth gas preset quantity III; After t5 time, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether it is in a-2λ>k2>0; If yes, the n+m+2th mixed gas adjusting process is executed, the gas supply state of the gas supply pipeline is kept, and after t6 time, the control module compares and analyzes the mixed gas state in the mixing tank through the mixed gas analyzer, judges whether k2 is more close to 0 than the n+m+1th time, and whether it is in k2<0 state; If yes, the n+m+1th gas supply state is kept, the n+m+3th mixed gas adjusting process is executed, until the n+m+qth time, k2 approaches to 0, and the gas mixing is completed.

9. The method for automatic mixing of gases applied to a laser cutting machine according to claim 1, characterized in that, based on a preset set value of oxygen supply amount and unit time t 氧 Oxygen is supplied to the mixing tank.

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