Laser head airtightness inspection device and inspection method thereof

Abstract

The invention belongs to the technical field of laser processing heads, and provides a laser head air tightness inspection device and an inspection method thereof.The laser head air tightness inspection device comprises a fixing device, a pipeline system, a plug mechanism and a main control unit, the fixing device is used for fixing a to-be-inspected laser head, and the plug mechanism is used for plugging a nozzle of the to-be-inspected laser head; the pipeline system comprises a branch pipe and an air pressure sensor, the branch pipe is used for providing an air source for the fixing device, the plug mechanism and the to-be-inspected laser head, the air pressure sensor is used for inspecting the air pressure value of the laser head, and the main control unit is used for controlling air source supply of the pipeline system and performing air tightness inspection calculation according to the air pressure value inspected by the air pressure sensor. And analyzing and displaying the result. The nozzle air outlet is directly sealed, the nozzle does not need to be disassembled / assembled, and abrasion of the nozzle and an opponent part is reduced; the test time is shortened; through the monitoring of the air pressure sensor and the calculation and analysis of the main control unit, the accuracy of the inspection result is improved.

Description

Technical Field

[0001] This application relates to the technical field of laser processing heads, and particularly relates to a laser head airtightness inspection device and an inspection method thereof. Background Art

[0002] During laser cutting processing, especially when cutting metal materials, auxiliary gas is generally passed. The auxiliary gas is an important factor in laser cutting processing. If the airtightness of the laser cutting head is not good, the pressure and speed of the auxiliary air flow ejected from the nozzle will not be able to meet the needs of the cutting process, resulting in a significant reduction in the cutting effect at best and incomplete cutting at worst. Therefore, the airtightness of the laser cutting head will be inspected when it leaves the factory.

[0003] The existing traditional method for testing the airtightness of a laser head is to remove the nozzle and replace it with a solid replacement nozzle plug, introduce compressed air through the auxiliary gas interface of the laser head and then close the air inlet to maintain pressure, and then observe the pressure gauge connected to the air inlet of the laser head. By observing the amplitude and speed of the pressure drop of the gauge pressure, the airtightness of the cutting head is determined. This method has the following problems: first, the subjectivity of the inspectors is relatively high; second, when testing with the nozzle replaced by a plug, the airtightness test between the nozzle and the mating part is not inspected; third, each time a test is performed, the nozzle needs to be removed and replaced with a plug, and then replaced with the nozzle after the test, which increases the wear of the nozzle and the mating part; this method has low test efficiency, poor accuracy and consistency.

[0004] Another existing test method is to replace the nozzle of the laser head with a plug, introduce compressed air into the air inlet of the laser head to maintain pressure, and then immerse the laser head in water and observe the bubbles. There are also problems of low efficiency and strong subjectivity, and the laser head may be damaged after being immersed in water. Summary of the Invention

[0005] In order to solve the problems of low inspection efficiency, poor accuracy and consistency in the prior art, the present invention provides a laser head airtightness inspection device and an inspection method thereof.

[0006] The first aspect of this application provides a laser head airtightness inspection device, which includes a fixing device, a pipeline system, a plug mechanism and a main control unit. The fixing device includes a bottom plate, a clamping cylinder and a fixing pin, and the laser head is fixed on the bottom plate through the clamping cylinder and the fixing pin;

[0007] The pipeline system includes an intake main pipe and branch pipes led out from the intake main pipe, including a first branch pipe, a second branch pipe and a third branch pipe. The first branch pipe, the second branch pipe and the third branch pipe supply air to the auxiliary air inlet of the laser head, the clamping cylinder and the plug mechanism respectively in sequence;

[0008] A pressure sensor is also arranged on the first branch pipe to continuously monitor the air pressure value of the laser head and transmit it to the main control unit;

[0009] The plugging mechanism includes a plug and a plug cylinder, and the plug cylinder drives the plug to move to seal the nozzle of the laser head.

[0010] The main control unit controls the air supply of the pipeline system, calculates based on the air pressure value transmitted by the air pressure sensor, and obtains the airtightness inspection result of the laser head.

[0011] In some embodiments, a first solenoid valve is provided between the first branch pipe and the main air inlet pipe, the air pressure sensor is arranged between the first solenoid valve and the auxiliary air inlet, a second solenoid valve is provided between the second branch pipe and the main air inlet pipe, and a third solenoid valve is provided between the third branch pipe and the main air inlet pipe. The main control unit controls the on-off of the air sources of each branch pipe through each solenoid valve.

[0012] In some embodiments, the main control unit includes a main control box and a display. The display is connected to the main control box. The main control box includes an air inlet, a power switch, a test switch, and an emergency stop switch. One end of the air inlet is connected to the air source, and the other end is communicated with the main air inlet pipe. The power switch realizes starting the air supply of the air source, and the test switch realizes the automatic inspection control of the airtightness of the laser head.

[0013] In some embodiments, the main control unit is further provided with solenoid valve buttons, and the solenoid valve buttons include a first valve button, a second valve button, and a third valve button, which are respectively used to control the start and stop of the first solenoid valve, the second solenoid valve, and the third solenoid valve in sequence, so as to realize the manual inspection control of the airtightness of the laser head.

[0014] In some embodiments, the air pressure sensor transmits the inspection air pressure value of the laser head to the main control unit. The main control unit calculates the inspection pressure drop between the set air pressure value and the inspection air pressure value, compares the inspection pressure drop value with the pressure drop threshold to judge and obtain the airtightness inspection result, and displays the airtightness inspection result.

[0015] In some embodiments, the plug is made of an elastic material. The plug is connected to the plug cylinder through a telescopic rod. The plug cylinder drives the telescopic rod to reciprocate, so as to drive the plug to seal or move away from the nozzle of the laser head.

[0016] In some embodiments, a one-way valve and a silencer are further provided between the first solenoid valve and the air outlet of the first branch pipe.

[0017] In some embodiments, the main control unit further includes a scanning device, and the scanning device is used to identify the product serial number of the laser head, so as to store the product serial number corresponding to the inspection result.

[0018] In a second aspect, a method for inspecting the airtightness of a laser head is provided, which has the following steps: Step 1, place the laser head on the laser head airtightness inspection device according to any one of claims 1-8;

[0019] Step 2: Start the air supply control. Turn on the power switch of the main control unit and turn on the air source.

[0020] Step 3: Supply air to the clamping cylinder to clamp the laser head on the fixing device.

[0021] Step 4: After the laser head is fixed at the inspection position, supply air to the plugging mechanism to seal the nozzle of the laser head.

[0022] Step 5: After the plugging mechanism seals the nozzle, supply air to the auxiliary air inlet of the laser head and reach the set air pressure value.

[0023] Step 6: After reaching the set air pressure value, stop supplying air to the auxiliary air inlet of the laser head and start timing. At the same time, the air pressure sensor transmits the monitored air pressure value to the main control unit. After reaching the inspection time, the main control unit calculates and analyzes the set air pressure value and the air pressure value at the end of timing to obtain the inspection result.

[0024] Step 7: Stop supplying air to the plugging mechanism, open the nozzle and discharge the gas inside the laser head, then stop supplying air to the clamping cylinder, release the laser head, and end the inspection process.

[0025] In some embodiments, the control processes of Steps 3 - 7 are completed by starting the automatic control operation through the test switch or by manual operation through the solenoid valve button.

[0026] Compared with the prior art, the beneficial effects that the present application can achieve are as follows:

[0027] 1. In the present application, by directly sealing the nozzle air outlet hole of the laser head, compared with the traditional inspection method, there is no need to disassemble the nozzle during testing, reducing the part wear of the nozzle and the mating parts; the testing time is shortened.

[0028] 2. In the present application, an air pressure sensor is set to monitor the air pressure in the test air circuit in real time and transmit the pressure data to the main control unit in real time. The main control unit compares and calculates the change amount of the pressure over time with the set value to determine whether the airtightness meets the requirements and outputs the result through the display; there is no need for manual judgment of the test data, and the test result is more objective and accurate.

[0029] 3. In the present application, a set of pipeline system simultaneously meets the fixation of the laser head, the air supply for airtightness inspection, and the automatic blocking of the nozzle, simplifying the complexity of the airtightness inspection device, improving the inspection accuracy and the degree of automation.

[0030] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specific preferred embodiments are given in conjunction with the accompanying drawings and are described in detail as follows. Brief Description of the Drawings

[0031] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0032] Figure 1 Shows a schematic structural diagram of an airtightness inspection device for a laser head of the present application;

[0033] In the figure: 1 - laser head, 2 - auxiliary air inlet, 3 - nozzle, 11 - bottom plate, 12 - fixing pin, 13 - clamping cylinder, 21 - main air inlet pipe, 22 - first branch pipe, 23 - second branch pipe, 24 - third branch pipe, 25 - first solenoid valve, 26 - second solenoid valve, 27 - third solenoid valve, 28 - air pressure sensor, 31 - plug cylinder, 32 - plug, 33 - telescopic rod, 41 - control box, 42 - power switch, 43 - test switch, 44 - emergency stop switch, 45 - display, 46 - first valve button, 47 - second valve button, 48 - third valve button. Specific embodiments

[0034] The terms "comprising", "including", "containing" or "characterized by" in the description, claims and accompanying drawings of the present application are synonymous, and are inclusive of endpoints or open-ended, and do not exclude additional unrecited elements or method steps. "Comprising" is a technical term used in claim language, meaning that the elements exist, but other elements can also be added and still form a structure or method within the scope of the claim.

[0035] It should be noted that: similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0036] References to "embodiments" in this specification mean that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] As a laser head airtightness inspection device in this embodiment, as Figure 1 shown, it includes a fixing device, a pipeline system, a plugging mechanism, and a main control unit. The fixing device is used to fix the laser head 1 to be inspected. The plugging mechanism is used to block the nozzle 3 of the laser head 1 to be inspected. The pipeline system is used to provide a gas source for the fixing device, the plugging mechanism, and the laser head 1 to be inspected. The main control unit is used to control the gas source supply of the pipeline system and analyze and display the airtightness inspection results.

[0039] The fixing device includes a bottom plate 11, a clamping cylinder 13, and a fixing pin 12. The laser head 1 to be inspected is placed on the bottom plate 11 aligning with the fixing pin 12, and then the laser head 1 is clamped and fixed on the bottom plate 11 by the clamping cylinder 13.

[0040] The plugging mechanism includes a plugging cylinder 31, a plug 32, and a telescopic rod 33. The plug 32 is located at the front end of the telescopic rod 33. The cylinder drives the telescopic rod 33 to reciprocate, thereby driving the plug 32 to seal and remove the laser head 1 to be inspected. The plug 32 is made of wear-resistant elastic materials such as rubber, silicone, PU, TPU, etc. The plug 32 can generate a certain degree of deformation during the sealing process with the nozzle 3, so as to be in close contact or interference fit with the nozzle 3, achieving a good sealing effect.

[0041] In some embodiments, the plug 32 has a frustum of a cone structure, and the cross-section at the front end is smaller. When the plug 32 moves forward to seal the laser head 1 to be inspected, a section of the front end of the frustum of the cone can enter the nozzle 3. When the cylinder cannot continue to push, an interference plugging seal of the plug 32 on the laser head 1 is achieved. During the inspection process, the plugging cylinder 31 maintains the plugging position of the plug 32. When the inspection is over, the plugging cylinder 31 retracts the plug 32 to release the gas in the laser head 1.

[0042] Further, in some embodiments, the front cross-sectional diameter of the conical frustum of the plug 32 is greater than or equal to 1 mm, and the rear cross-sectional diameter of the conical frustum is greater than 6 mm, which can at least seal the nozzle 3 of the laser head 1 with a diameter ranging from 1 to 6 mm, such as 1.0 mm, 1.2 mm, 1.4 mm, 1.5 mm, 1.7 mm, 1.8 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, and 6.0 mm, etc.

[0043] In some embodiments, when the plug 32 moves forward to seal the laser head 1 to be inspected, the front end face of the plug 32 abuts and seals the nozzle 3 of the laser head 1. The plug 32 can be a conical frustum or a cylindrical structure. Further, the front diameter of the conical frustum or the diameter of the cylinder is greater than 6 mm, so as to at least seal the nozzle 3 of the laser head 1 with a diameter ranging from 1 to 6 mm. The preferred diameter of the plug 32, such as 10 mm, has enough contact surface to seal the nozzle 3. Therefore, even if there is a slight deviation between the plug and the nozzle, alignment and sealing can still be achieved.

[0044] Further, there is a flange extending radially outward on the rear end face of the plug 32, which can strengthen the sealing of the nozzle 3 of the largest specifiable laser head 1 that can be inspected.

[0045] In this embodiment, a plug mechanism is adopted to achieve automatic sealing and pressure relief of the laser head 1. Compared with the prior art in which the nozzle 3 needs to be removed and then sealed with a solid plug 32, there is no need to disassemble the nozzle 3 of the laser head 1 to be inspected. While inspecting the airtightness inside the laser head, the airtightness between the nozzle and the mating part, such as a ceramic ring, etc., is also inspected, and the test time is shortened. After the inspection, there is no need to restore the laser head 1, and there is no need to disassemble and assemble the nozzle for each inspection, reducing the part wear of the nozzle 3 and the mating part, and ensuring the consistency of the airtightness inspection. Moreover, the plug 32 is a conical frustum, which can block the nozzles 3 of some common laser heads 1 with different specifications, realizing the airtightness test of laser heads 1 with multiple specifications.

[0046] The pipeline system includes an intake main pipe 21 and branch pipes led out from the intake main pipe 21, which are used to supply gas to the auxiliary intake port 2, the clamping cylinder 13, and the plug mechanism simultaneously. The intake main pipe 21 is connected to the intake port of the main control unit. The branch pipes include a first branch pipe 22, a second branch pipe 23, and a third branch pipe 24. The outlet of the first branch pipe 22 is connected to the auxiliary intake port 2 of the laser head 1 to be tested, the second branch pipe 23 is connected to the clamping cylinder 13, and the third branch pipe 24 is connected to the plug cylinder 31. The setting of the pipeline system can realize multiple gas supply functions simultaneously only through one gas intake source. While simplifying the test device, it also simplifies the gas supply control process, thereby reducing the inspection interference and improving the inspection efficiency.

[0047] A first solenoid valve 25 is provided between the first branch pipe 22 and the intake main pipe 21, a second solenoid valve 26 is provided between the second branch pipe 23 and the intake main pipe 21, and a third solenoid valve 27 is provided between the third branch pipe 24 and the intake main pipe 21. Each solenoid valve is connected to the main control unit, and the start and stop of the solenoid valve are controlled by the main control unit. A pressure sensor 28 is also provided between the first branch pipe 22 and the auxiliary intake port 2 to monitor the change in air pressure and transmit it to the main control unit. The main control unit compares the change amount with a set threshold value to determine whether the airtightness is qualified. Through the objective monitoring of the pressure drop by the pressure sensor 28, and then calculated and compared by the main control unit, the result is output through the display. The inspection data does not require manual judgment, so the inspection result is more objective and accurate.

[0048] In some embodiments, a check valve and a silencer are also provided between the first solenoid valve 25 and the outlet of the first branch pipe 22. After the inspection is completed, the solenoid valve can be used to exhaust gas alone, and the silencer can further reduce the exhaust noise.

[0049] The main control unit includes a main control box and a display 45. An air intake port, a power switch 42, and a test switch 43 are provided on the main control box. One end of the air intake port is connected to the air source, and the other end is communicated with the intake main pipe 21. The test switch 43 is used to start the air source to supply gas, and the test switch 43 is used for automatic inspection control of the airtightness of the laser head 1.

[0050] In some embodiments, the main control unit further includes solenoid valve buttons, which include a first valve button 46, a second valve button 47, and a third valve button 48, respectively used to control the start and stop of the first solenoid valve 25, the second solenoid valve 26, and the third solenoid valve 27, so as to realize manual inspection control of the airtightness of the laser head 1.

[0051] In some embodiments, the solenoid valve button is a self-locking switch. When pressed for the first time, the solenoid valve remains open, and when pressed again, the solenoid valve is closed. The solenoid valve button is also provided with a signal lamp, which remains on when open and goes out when closed, thus avoiding misoperation.

[0052] In some other embodiments, the solenoid valve button includes multiple pairs of normally open keys and normally closed keys. Each solenoid valve is controlled by a pair of normally open keys and normally closed keys. The normally open key controls opening, and the normally closed key controls stopping.

[0053] The airtightness inspection device for the laser head 1 in this application can be automatically controlled for inspection or manually controlled for inspection, to meet different inspection application scenarios.

[0054] Automatic control method:

[0055] When performing the airtightness test, align the laser head 1 to be tested with the pin on the bottom plate 11. Connect the first branch pipe 22 to the auxiliary air inlet 2 of the laser head 1 and keep it airtight. Clamp the laser head 1 and the bottom plate 11 with the clamping cylinder 13. After placing the laser head 1 in the test position, turn on the power switch 42 of the main control unit, press the test switch 43, and through the control program in the main control unit, automatically control the switching sequence and the on-off duration of the solenoid valve to perform the airtightness test.

[0056] The main control unit will first send a start signal to the second solenoid valve 26 to control the clamping cylinder 13 to clamp the laser head 1. Then, the main control unit sends a signal to the third solenoid valve 27 to control the plugging cylinder 31 to seal the nozzle 3 of the laser head 1. Next, the main control unit sends a start signal to the first solenoid valve 25 to supply air to the auxiliary air inlet 2 of the laser head 1. At the same time, the main control unit receives the air pressure value monitored by the pressure sensor on the first branch pipe 22. When the air pressure value reaches the set air pressure value, close the first solenoid valve 25 and stop supplying air to the auxiliary air inlet 2. At the same time, start timing. When the timing reaches the set test time T1, calculate the pressure drop between the set air pressure value and the air pressure value at the end of the timing, and compare the actual pressure drop value with the pressure drop threshold. If the actual pressure drop value is less than the pressure drop threshold, the test result is passed; if the pressure drop value is greater than the specified value, the test result is not passed. The test result is directly displayed on the display 45.

[0057] After the test is completed, the main control unit first closes the third solenoid valve 27, releases the plugging cylinder 31, opens the nozzle 3 to release the gas in the laser head 1. After the release is completed, close the second solenoid valve 26, release the clamping cylinder 13, and finally disconnect the connection between the first branch pipe 22 and the auxiliary inlet, then the tested laser head 1 can be removed to perform the test on the next laser head. After the test is completed, turn off the power switch 42 of the main control unit and disconnect the air supply from the air source to end the test.

[0058] The automatic test method only needs to ensure that the laser head 1 to be tested is fixed in the test position and the connection between the first branch pipe 22 and the auxiliary air inlet 2, then one-key automatic test can be realized. It improves the test efficiency, and with program control, it avoids the subjectivity in the process of personnel participation and improves the test accuracy.

[0059] Manual control method:

[0060] When performing the airtightness test, align the laser head 1 to be tested with the pin on the bottom plate 11. Connect the first branch pipe 22 to the auxiliary air inlet 2 of the laser head 1. Clamp the laser head 1 and the bottom plate 11 with the clamping cylinder 13. After placing the laser head 1 in the test position, turn on the power switch 42 of the main control unit, and the air supply of the main air inlet pipe 21 is ready to start the airtightness test.

[0061] Press the second valve button 47 to open the second solenoid valve 26 between the main air inlet pipe 21 and the second branch pipe 23, supply air to the clamping cylinder 13, and control the clamping cylinder 13 to clamp the laser head 1; then press the third valve button 48 to open the third solenoid valve 27 between the main air inlet pipe 21 and the third branch pipe 24, supply air to the plug cylinder 31 of the plug mechanism, and control the telescopic cylinder to extend to seal the laser head 1 with the plug 32; finally, press the first valve button 46 to open the first solenoid valve 25 between the main air inlet pipe 21 and the first branch pipe 22, and fill the auxiliary inspection gas into the laser head 1 from the auxiliary air inlet 2. When the main control unit receives that the air pressure value of the pressure sensor reaches the set air pressure value, it closes the first solenoid valve 25 to stop the air supply. At the same time, the timing starts, and the air pressure sensor 28 monitors the air pressure value inside the laser head 1 in real time. When the count reaches the set inspection time T1, calculate the pressure drop between the set air pressure value and the air pressure value at the end of the timing, and compare the actual pressure drop value with the pressure drop threshold. If the pressure drop value is less than the specified value, the test result is passed; if the pressure drop value is greater than the specified value, the test result is not passed. The test result is displayed on the display 45 connected to the main control unit.

[0062] After the inspection is completed, press the third valve button 48 to close the third solenoid valve 27, release the plug cylinder 31, open the nozzle 3 to release the gas inside the laser head 1. After the release is completed, press the second valve button 47 to close the second solenoid valve 26, release the clamping cylinder 13, and finally press the first valve button 46 to disconnect the connection between the first branch pipe 22 and the auxiliary inlet, then the inspected laser head 1 can be removed to perform the inspection of the next laser head.

[0063] By setting the automatic inspection mode and the manual inspection mode, different inspection time settings can be satisfied, so as to meet the requirements of different inspection conditions. For example, when the inspection duration of the conventional laser head 1 is T1, the timing duration in the control program can be set in the control box 41, and only the inspection button needs to be pressed during the inspection to complete the inspection. For the inspection of some individual specific specifications of the laser head 1, the inspection conditions are different. For example, when the laser head 1 is larger in size, the inspection time T2 is longer, but it is not convenient to change the program, or during the transitional period when the control program needs to be updated, the inspection can be satisfied through manual control without the need to replace the inspection device.

[0064] In some embodiments, the main control unit is also provided with an emergency stop switch 44. During the automatic inspection process, when an emergency occurs, the inspection process can be stopped through the emergency stop switch to ensure the safety and reliability of personnel and the inspection environment. Because each step of the automatic test process is not manually implemented. For example, if the operator does not place the laser head correctly, it will cause unreliable positioning and clamping of the laser head, and there may be deviations in the driving force and position of the plug cylinder, which may scratch and damage the laser head; or the equipment fails and needs to be urgently interrupted during the test, etc. The inspection process can be stopped through the emergency stop switch to ensure the safety and reliability of the equipment.

[0065] In some embodiments, the main control unit further includes a barcode scanning device, which scans the product serial number of the laser head 1 before inspection and saves the product serial number together with its corresponding inspection result after inspection to form a product inspection quality database, thereby further obtaining the product qualification rate. Moreover, the multiple inspection results of the same serial number and the inspection dates can be retained, so as to monitor the usage status of the laser head 1.

[0066] The embodiments of the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A laser head air tightness inspection device, characterized in that: It includes a fixing device, a pipeline system, a plugging mechanism and a main control unit. The fixing device includes a base plate, a clamping cylinder and a fixing pin. The laser head is fixed to the base plate through the clamping cylinder and the fixing pin. The pipeline system includes an air intake main pipe, and branch pipes extending from the air intake main pipe, including a first branch pipe, a second branch pipe, and a third branch pipe, wherein the first branch pipe, the second branch pipe, and the third branch pipe supply air to the auxiliary air intake port, the clamping cylinder, and the plugging mechanism of the laser head respectively; The first branch pipe is also provided with an air pressure sensor to monitor the air pressure value of the laser head in real time and transmit it to the main control unit; The plugging mechanism includes a plug and a plugging cylinder, and the plugging cylinder drives the plug to move so as to seal the nozzle of the laser head; The main control unit controls the air supply of the pipeline system, and performs calculations based on the air pressure value transmitted by the air pressure sensor to obtain an air tightness test result of the laser head.

2. The laser head air tightness inspection device according to claim 1, characterized in that: A first solenoid valve is arranged between the first branch pipe and the air intake main pipe, the air pressure sensor is arranged between the first solenoid valve and the auxiliary air intake port, a second solenoid valve is arranged between the second branch pipe and the air intake main pipe, and a third solenoid valve is arranged between the third branch pipe and the air intake main pipe. The main control unit controls the on and off of the air source of each branch pipe through each solenoid valve.

3. The laser head air tightness inspection device according to claim 2, characterized in that: The main control unit includes a main control box and a display. The display is connected to the main control box. The main control box includes an air inlet, a power switch, a test switch, and an emergency stop switch. One end of the air inlet is connected to the air source, and the other end is connected to the air inlet main pipe. The power switch starts the air supply, and the test switch realizes automatic inspection and control of the air tightness of the laser head.

4. The laser head air tightness inspection device according to claim 3, characterized in that: The main control unit is also provided with a solenoid valve button, which includes a first valve button, a second valve button and a third valve button, which are respectively used to control the start and stop of the first solenoid valve, the second solenoid valve and the third solenoid valve, thereby realizing manual inspection control of the air tightness of the laser head.

5. The laser head air tightness inspection device according to claim 1, characterized in that: The air pressure sensor transmits the test air pressure value of the laser head to the main control unit. The main control unit calculates the test pressure drop between the set air pressure value and the test air pressure value, compares the test pressure drop value with the pressure drop threshold value to determine the air tightness test result, and displays the air tightness test result.

6. The laser head air tightness inspection device according to claim 1, characterized in that: The plug is made of elastic material and is connected to the plug cylinder through a telescopic rod. The plug cylinder drives the telescopic rod to reciprocate, thereby driving the plug to seal or move away from the nozzle of the laser head.

7. The laser head air tightness inspection device according to claim 2, characterized in that: A one-way valve and a muffler are also arranged between the first solenoid valve and the air outlet of the first branch pipe.

8. The laser head air tightness inspection device according to claim 1, characterized in that: The main control unit also includes a code scanning device, which is used to identify the product serial number of the laser head, thereby storing the product serial number and the inspection result in correspondence.

9. A method for testing the air tightness of a laser head, characterized in that: The steps are as follows: Step 1, placing the laser head on the laser head air tightness inspection device as described in any one of claims 1 to 8; Step 2: Start gas supply control by turning on the power switch of the main control unit to open the gas source; Step 3, supplying air to the clamping cylinder to clamp the laser head on the fixture; Step 4: After the laser head is fixed at the inspection position, air is supplied to the plugging mechanism so that the plugging mechanism seals the nozzle of the laser head; Step 5: After the plugging mechanism seals the nozzle, air is supplied to the auxiliary air inlet of the laser head and reaches the set air pressure value; Step 6: After reaching the set air pressure value, stop supplying air to the auxiliary air inlet of the laser head, start timing, and at the same time, the air pressure sensor transmits the monitored air pressure value to the main control unit. After reaching the inspection time, the main control unit calculates and analyzes the set air pressure value and the end timing air pressure value to obtain the inspection result; Step seven, stop supplying air to the plugging mechanism, open the nozzle and exhaust the gas inside the laser head, then stop supplying air to the clamping cylinder, release the laser head, and end the inspection process.

10. The laser head air tightness inspection method according to claim 9, characterized in that: The control process from step 3 to step 7 is completed by starting the automatic control operation through the test switch, or by manual operation through the solenoid valve button.

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